JP6080243B2 - Automotive bumper - Google Patents

Description

  According to the present invention, a relatively high strength frame extending in the front-rear direction and a relatively low strength frame extending in the front-rear direction are juxtaposed side by side in the vehicle width direction. A bumper beam made of fiber reinforced resin is fixed to the front and rear ends of the pair of left and right bumper beam extensions by fixing a bumper beam extension having a hollow closed cross section with a fiber reinforced resin to the outer end of the low strength frame. The present invention relates to an automobile bumper in which both ends in the vehicle width direction are fixed.

  A bumper beam made of fiber reinforced resin is supported on the front end of the front side frame via a bumper beam extension, and the front part of the lower member arranged on the outer side in the vehicle width direction of the front side frame is connected to the outer surface of the bumper beam extension in the vehicle width direction and the bumper. A beam connected to the outer end of the beam in the vehicle width direction is known from Patent Document 1 below.

  Also, a bumper beam extension made of steel plate press is connected to the outer end of the bumper beam made of aluminum extruded material in the vehicle width direction, and the rear end of the bumper beam extension is connected to the front side frame juxtaposed inside and outside in the vehicle width direction and the front end of the upper member. This is known from Patent Document 2 below.

  In addition, a bumper beam (bumper reinforcement) made of metal extrusion material and a bumper beam extension (crash box) made of fiber reinforced resin are joined with a metal plate sandwiched between them to load from the bumper beam to the tip of the bumper beam extension. Japanese Patent Application Laid-Open No. 2004-228561 is known that can transmit the light uniformly.

  Also, the bumper beam (bumper reinforcement) made of aluminum extruded material is supported on the support member that protrudes forward and inward in the vehicle width direction from the left and right bumper beam extensions (bumper stay) made of aluminum extruded material. By reducing the distance between the left and right support parts and reducing the bending moment that acts on the bumper beam when a collision load is input from the front, the required strength of the bumper beam is reduced to reduce the weight. This is known from US Pat.

Japanese Unexamined Patent Publication No. 2013-52856 Japanese Unexamined Patent Publication No. 2012-81844 Japanese Unexamined Patent Publication No. 2008-221987 Japanese Unexamined Patent Publication No. 2007-261427

  By the way, when the collision load of the frontal collision is transmitted from the bumper beam to the bumper beam extension, it becomes difficult to effectively absorb the collision energy if the bumper beam extension is inclined in the vehicle width direction. That is, when the bumper beam extension is supported by the inner frame (front side frame) and the outer frame (lower member or upper member), the inner frame is generally stronger than the outer frame. However, the bumper beam extension is tilted outward in the vehicle width direction and the impact energy absorption effect is reduced.

  Since the outer frame (upper member) is connected not to the rear end of the bumper beam extension but to the outer surface in the vehicle width direction, the bumper beam is changed from the bumper beam to the bumper beam extension when the collision load is input. The load cannot be transmitted efficiently, and the bumper beam extension may not be able to exhibit a sufficient energy absorption effect.

  In addition, what is described in Patent Document 2 described above uses a bumper beam made of an aluminum extruded material and a bumper beam extension made of a steel plate press, so there is a limit to weight reduction, and weight reduction using a fiber reinforced resin. is necessary.

  In addition, in Patent Document 3, when a collision load is input to the bumper beam, the bumper beam supported by a pair of bumper beam extensions at both ends in the vehicle width direction is bent rearward to absorb the collision energy. However, because the bumper beam and the bumper beam extension are firmly connected so as to form a certain angle across the metal plate, the middle part of the bumper beam in the vehicle width direction is bent backward when a collision load is input. Therefore, there is a possibility that the bumper beam bends backward at the joint portion with the bumper beam extension, and the impact energy absorbing effect due to the bending deformation of the bumper beam may not be effectively exhibited.

  In addition, in the above-mentioned Patent Document 4, the bumper beam and the bumper beam extension are made of metal, so there is a limit to the weight reduction. To further reduce the weight, the bumper beam and the bumper beam extension are fiber reinforced. It needs to be made of resin.

  From the above, it is desirable to make the bumper beam and bumper beam extension made of fiber reinforced resin in order to ensure the energy absorption performance at the time of collision while reducing the weight of the bumper for automobiles, but the fiber reinforced resin breaks more than metal. Since the elongation is small, if a large bending moment acts on the bumper beam due to a collision load, the bumper beam may break, and a stable energy absorption effect due to the bending deformation of the bumper beam may not be expected.

  The present invention has been made in view of the above circumstances, and prevents the bumper beam extension made of fiber reinforced resin from tilting outward in the vehicle width direction due to a collision load, and made of fiber reinforced resin supported by the bumper beam extension. An object of the present invention is to enable bending deformation of the bumper beam, reduce the bending moment acting on the bumper beam, and achieve both weight reduction and energy absorption effect.

To achieve the above object, according to the present invention, a pair of a relatively high strength frame extending in the front-rear direction and a relatively low strength frame extending in the front-rear direction are juxtaposed in the vehicle width direction, The front and rear ends of the relatively high-strength frame and the relatively low-strength frame are fixed with a bumper beam extension having a hollow closed cross section made of fiber reinforced resin, and the pair of left and right bumper beam extensions is fixed in the front-rear direction. A bumper beam made of fiber reinforced resin is fixed to both ends in the vehicle width direction of the bumper beam, and the bumper beam extension includes a groove portion extending in the front-rear direction at an intermediate portion in the vehicle width direction, and the inner side in the vehicle width direction. Two upper and lower first ridgelines positioned at the upper and lower two second ridgelines adjacent to the groove, and two upper and lower third ridgelines positioned outside in the vehicle width direction. And a line, the first ridge and the second ridge forms a virtual rectangular cross section which is located on substantially an extension of the relatively high strength of the rectangular cross section frame, said virtual rectangular cross section the first ridge and the second ridge, the relatively located generally respectively on the extension line of the vehicle width direction inner side of the two upper and lower edges and the vehicle width direction outer side of the two upper and lower edge line of a high strength frame, and the The third ridge line is located substantially on the extension line of the two upper and lower ridge lines on the relatively high-strength frame side in the vehicle width direction of the relatively low-strength frame having a rectangular cross section, and the bumper beam extension is The upper member and the lower member main body portions having a U-shaped cross section are fastened by side flanges inside and outside in the vehicle width direction, and the upper and lower bumper beam mounting portions of the upper member and the lower member main body portions are connected to the bumper. Beam Automotive bumpers that are connected respectively to the wall and a lower wall and the first feature is proposed.

According to the invention, in addition to the first feature, the bumper beam extension extends at least in the front-rear direction on the upper wall and the lower wall of the main body sandwiched between the first ridge line and the second ridge line. There is proposed a bumper for an automobile having a second feature that includes one reinforcing rib, and the first ridgeline, the second ridgeline, and the reinforcing rib are arranged at equal intervals in the vehicle width direction.

According to the present invention, in addition to the first feature, the bumper beam extension comprising a continuous fiber-reinforced resin sheet has continuous fibers oriented in at least a vehicle width direction, said groove you have a arc cross section The automobile bumper having the third feature is proposed.

According to the invention, in addition to the first feature, the fastening member that fastens the side flange on the inner side in the vehicle width direction is more longitudinal than the fastening member that fastens the side flange on the outer side in the vehicle width direction. An automobile bumper according to a fourth feature is proposed, which includes a continuous fiber reinforced resin sheet in which continuous fibers are oriented at least in the vehicle width direction, and is disposed inside the groove .

According to the invention, in addition to the first feature, the bumper beam extension is obtained by hot pressing a continuous fiber reinforced resin sheet containing continuous fibers and a discontinuous fiber reinforced resin sheet containing discontinuous fibers in a laminated state. A fifth aspect of the present invention proposes a bumper for an automobile, wherein the side flange is fastened by a fastening member at a portion including the continuous fiber reinforced resin sheet.

According to the present invention, in addition to the first feature, the bumper and bumper beam mounting portion of the beam extension, automotive and sixth aspect of that mechanically coupled to the upper wall and lower wall of the bumper beam A bumper is proposed.

According to the present invention, in addition to the first feature, the bumper beam extension includes, as a seventh feature, an extension that extends the joint flange on the inner side in the vehicle width direction toward the inner side in the vehicle width direction. Automotive bumpers are proposed.

According to the present invention, in addition to said first aspect, the bumper beam mounting portion eighth aspect of further comprising a locking wall for locking the longitudinal direction outside the vehicle width direction outer end of the bumper beam A bumper for automobiles is proposed.

According to the present invention, a relatively high strength frame extending in the front-rear direction and a relatively low strength frame extending in the front-rear direction are juxtaposed in the left-right direction in the vehicle width direction. And a bumper beam extension having a hollow closed cross section made of fiber reinforced resin is fixed to the outer end in the front-rear direction of the relatively low strength frame, and made of fiber reinforced resin at the outer end in the front-rear direction of the pair of left and right bumper beam extensions. The bumper beam extension is fixed to both ends of the bumper beam in the vehicle width direction, and the bumper beam extension includes a groove portion extending in the front-rear direction at the middle portion in the vehicle width direction, and two upper and lower second bumpers positioned on the inner side in the vehicle width direction. A first ridge line; two upper and lower second ridge lines adjacent to the groove; and two upper and lower third ridge lines positioned on the outer side in the vehicle width direction; The line and the second ridge line form a virtual rectangular cross-section portion that is located substantially on the extension line of the relatively high-strength frame of the rectangular cross-section, and the first ridge line and the second ridge line of the virtual rectangular cross-section portion are The relatively high-strength frame is positioned on approximately the extension lines of the two upper and lower ridge lines on the inner side in the vehicle width direction and the two upper and lower ridge lines on the outer side in the vehicle width direction, and the third ridge line has a rectangular cross section. The relatively low-strength frame is positioned substantially on the extension line of the two upper and lower ridge lines on the relatively high-strength frame side of the relatively low-strength frame, and the bumper beam extension is located outside the continuous fiber reinforced resin sheet on the inside. A body portion of a cylindrical closed cross section extending in the front-rear direction in which discontinuous fiber reinforced resin sheets are laminated to each other, and upper and lower ends of the discontinuous fiber reinforced resin sheet in the main body portion extending from the front and rear direction toward the bumper beam. Bumper And a beam attachment portion, automobile bumpers to ninth feature of that the upper and lower bumper beam mounting portion coupled to the upper and lower surfaces of the bumper beam is proposed.

According to the present invention, in addition to the ninth aspect, said bumper beam, wherein the first 10 to the vibration-welded to the upper and lower surfaces of consisting the upper and lower bumper beam mounting portion discontinuous fiber-reinforced resin sheet Automotive bumpers are proposed.

According to the present invention, in addition to the ninth or tenth feature, the bumper beam extension includes a mounting flange coupled to a back plate provided at a front end of the relatively high strength frame, The continuous fiber reinforced resin sheet and the discontinuous fiber reinforced resin sheet in a part extend to the inner end in the front-rear direction of the bumper beam extension in a laminated state, and only the discontinuous fiber reinforced resin sheet is bent at a right angle to form the mounting flange. An automobile bumper having an eleventh feature is proposed.

According to the invention, in addition to any one of the ninth to eleventh features, the bumper beam extension is a side flange provided inside and outside in the vehicle width direction of the upper member and the lower member having a U-shaped cross section. A bumper for an automobile according to a twelfth aspect, wherein a folded portion that is formed by joining together and is bent at a right angle in a direction away from each other at an end in the vehicle width direction is formed on at least one of the joined side flanges. Is proposed.

According to the invention, in addition to the twelfth feature, the continuous fiber reinforced resin sheet and the discontinuous fiber reinforced resin sheet of the main body portion extend to the vehicle width direction end portion of the side flange in a laminated state. From the above, a car bumper according to a thirteenth feature is proposed in which only the discontinuous fiber reinforced resin sheet is bent at a right angle to constitute the folded portion.

According to the invention, in addition to the sixth feature, the bumper beam mounting portion includes a fixing hole through which a fastening member for fixing the bumper beam passes, and the fixing hole is formed by a long hole extending in the front-rear direction. An automobile bumper having the fourteenth feature is proposed.

  The rivets 34 and 35 of the embodiment correspond to the fastening member of the present invention, the front side frame 36 of the embodiment corresponds to the relatively high strength frame of the present invention, and the lower member 37 of the embodiment This corresponds to the relatively low strength frame of the present invention.

  According to the first feature of the present invention, a bumper for an automobile has a relatively high strength frame extending in the front-rear direction and a relatively low strength frame extending in the front-rear direction juxtaposed inside and outside in the vehicle width direction. A bumper beam extension with a hollow closed cross section made of fiber reinforced resin is fixed to the front and rear outer ends of the relatively high-strength frame and relatively low-strength frame, and the pair of left and right bumper beam extensions is fixed to the front and rear outer ends. The bumper beam made of fiber reinforced resin is fixed at both ends in the vehicle width direction.

The bumper beam extension includes a groove portion extending in the front-rear direction at a vehicle width direction intermediate portion, two upper and lower first ridge lines positioned on the inner side in the vehicle width direction, two upper and lower second ridge lines adjacent to the groove portion, and a vehicle width. Two upper and lower third ridge lines positioned on the outer side in the direction, and the first ridge line and the second ridge line are virtual rectangular cross-section portions that are located on substantially extension lines of a relatively high-strength frame of the rectangular cross-section. formed, first edges and second ridge virtual rectangular cross section, relatively substantially extended in the two upper and lower edges and the vehicle width direction outer side of the two upper and lower edge line of the vehicle width direction inner side of the high-strength frame respectively positioned on a line, and said third ridge than you located on generally an extension of the two upper and lower edges of the frame side of the relatively high strength of the relatively low strength of the rectangular cross section frame, Bumper beam to bumper beam Of the collision load transmitted to the extension, the amount of load transmitted to the relatively high-strength frame from the two first ridge lines and the two second ridge lines of the virtual rectangular cross section of the bumper beam extension increases. In addition, the load transmitted to the relatively low-strength frame from the two third ridges of the bumper beam extension is reduced, preventing the bumper beam extension from tilting, and the relatively high-strength frame adjacent to the vehicle width direction. In addition, the bumper beam extension spanned over a relatively low-strength frame can be stably collapsed, and the impact energy absorption effect can be enhanced.

Also, the bumper beam extension is configured by fastening the main body portion of the upper member and the lower member having a U-shaped cross section in the vehicle width direction inside and outside of the side flanges, the upper and lower bumper beam mounting portion of the upper member and the lower member Are connected to the upper and lower walls of the bumper beam, respectively, so that the strength of the bumper beam extension is gradually increased from the bumper beam mounting part toward the main unit, and the impact of the bumper beam extension is applied when a collision load is input from the bumper beam. By preventing a sudden rise, the bumper beam extension can be crushed sequentially toward the inside to enhance the impact energy absorption effect.

According to the second feature of the present invention, the bumper beam extension includes at least one reinforcing rib extending in the front-rear direction on the upper wall and the lower wall of the main body sandwiched between the first ridge line and the second ridge line, Since the first ridge line, the second ridge line and the reinforcing rib are arranged at equal intervals in the vehicle width direction, the surface rigidity of the bumper beam extension is made uniform in the vehicle width direction, and the bumper beam extension is moved from the front and rear direction outside when the collision load is input. By collapsing inward, the impact energy absorption effect can be enhanced.

According to a third aspect of the present invention, the bumper beam extension comprising a continuous fiber-reinforced resin sheet has continuous fibers oriented in at least the vehicle width direction, the groove is Runode to have a circular arc shaped cross section, the bumper beam by the groove In addition to increasing the impact strength by increasing the strength of the extension, the tensile load applied to the continuous fiber in the groove with the arc-shaped cross section during molding is reduced compared to the groove with the square cross section, thereby preventing the continuous fiber from breaking. The strength of the bumper beam extension can be secured.

According to the fourth aspect of the present invention, the fastening member that fastens the side flange on the inner side in the vehicle width direction is arranged on the inner side in the front-rear direction than the fastening member that fastens the side flange on the outer side in the vehicle width direction. Reduces the strength of the inner part of the bumper beam extension in the vehicle width direction and allows the bumper beam to bend when the collision load is input to increase the impact energy absorption effect. The impact energy absorption effect can be enhanced by uniformly crushing.

According to a fifth aspect of the present invention, the bumper beam extension is configured by hot pressing a continuous fiber reinforced resin sheet containing continuous fibers and a discontinuous fiber reinforced resin sheet containing discontinuous fibers in a laminated state, Since the flange is fastened by the fastening member at the part including the continuous fiber reinforced resin sheet, the bumper beam extension is prevented by the continuous fiber reinforced resin sheet having high breaking strength preventing the side flange from breaking around the fastening member. The upper member and the lower member can be prevented from separating.

According to the sixth aspect of the present invention, since the bumper beam mounting portion of the bumper beam extension is mechanically coupled to the upper wall and the lower wall of the bumper beam, the coupling strength and the assembling property can be improved. .

Further, according to the seventh feature of the present invention, the bumper beam extension includes an extension part that extends the joint flange inside in the vehicle width direction inward in the vehicle width direction. The deformation center of the bumper beam can be moved inward in the vehicle width direction, and the maximum bending moment acting on the bumper beam can be reduced by shortening the distance from the deformation center of the bumper beam to the input point of the collision load. .

According to the eighth aspect of the present invention, the bumper beam mounting portion includes a locking wall that locks the outer end in the vehicle width direction of the bumper beam from the outside in the front-rear direction. When the outer part in the vehicle width direction moves outward in the front-rear direction, the movement is blocked by the locking wall and the collision load is efficiently transmitted from the bumper beam to the bumper beam extension. Crushing can be promoted to increase energy absorption.

According to the ninth aspect of the present invention, both ends in the vehicle width direction of the bumper beam made of fiber reinforced resin are fixed to the outer ends in the front-rear direction of the pair of bumper beam extensions made of fiber reinforced resin. The bumper beam extension consists of a main body with a cylindrical closed cross section extending in the front-rear direction in which discontinuous fiber reinforced resin sheets are laminated on the outer side of the inner continuous fiber reinforced resin sheet, and the front-rear direction outside the discontinuous fiber reinforced resin sheet in the main body Since the upper and lower bumper beam mounting parts are connected to the upper and lower surfaces of the bumper beam, the collision load input to the bumper beam is applied to the bumper beam extension. When transmitted, the bumper beam mounting portion made of a discontinuous fiber reinforced resin sheet having a lower rigidity than that of the continuous fiber reinforced resin sheet is deformed to allow bending deformation of the bumper beam and enhance the impact energy absorption effect. At the same time, it is possible to avoid destruction due to local deformation of the bumper beam. Finally, the continuous fiber reinforced resin sheet in the bumper beam extension main body supports the collision load from the bumper beam, so that the bumper beam extension can be crushed in the front-rear direction to effectively absorb the collision energy. .

According to the tenth feature of the present invention, since the upper and lower bumper beam mounting portions are vibration welded to the upper and lower surfaces of the bumper beam made of the discontinuous fiber reinforced resin sheet, they are bonded by welding the discontinuous fiber reinforced resin sheets. Not only is the strength improved, but mechanical coupling means such as rivets are not required, and the number of parts is reduced.

According to an eleventh aspect of the present invention, the bumper beam extension includes a mounting flange coupled to a back plate provided at the front end of the front side frame, and includes a continuous fiber reinforced resin sheet and a discontinuous fiber reinforced resin sheet of the main body. Is extended to the front and rear inner ends of the bumper beam extension in a laminated state, and from there, only the discontinuous fiber reinforced resin sheet is bent at a right angle to form the mounting flange, so the base of the mounting flange continuous to the main body is curved. As compared with the case of the present invention, it is possible to increase the strength of the base portion of the mounting flange, and to prevent the inclination of the bumper beam extension when the collision load is input, thereby enhancing the collision energy absorption effect. Moreover, when forming the bumper beam extension, the continuous fiber of the continuous fiber reinforced resin sheet can be tensioned by the discontinuous fiber reinforced resin sheet flowing toward the mounting flange, and the continuous fiber of the continuous fiber reinforced resin sheet can be removed. .

According to the twelfth feature of the present invention, the bumper beam extension is formed by combining side flanges provided inside and outside the vehicle width direction of the upper member and the lower member having a U-shaped cross section. Since the folded portion that bends at right angles in the direction away from each other is formed at the end portion of the side flange in the vehicle width direction, compared to the case where the folded portion extends while curving from the end portion of the side flange in the vehicle width direction, The reinforcing effect of the side flange can be enhanced, and it is possible to prevent the bumper beam extension from opening and deforming at the side flange portion when a collision load is input, thereby impairing the collision energy absorption effect.

According to the thirteenth feature of the present invention, the continuous fiber reinforced resin sheet and the discontinuous fiber reinforced resin sheet of the main body part extend to the vehicle width direction end of the side flange in a laminated state, and from there, the discontinuous fiber reinforced resin Since only the sheet is bent at a right angle to form the folded portion, the folded portion can further enhance the reinforcing effect of the side flange. In addition, when forming the bumper beam extension, the continuous fiber of the continuous fiber reinforced resin sheet can be tensioned by the discontinuous fiber reinforced resin sheet flowing toward the folded portion, and the continuous fiber bending of the continuous fiber reinforced resin sheet can be removed. .

According to the fourteenth feature of the present invention, the bumper beam mounting portion includes a fixing hole through which a fastening member for fixing the bumper beam passes, and the fixing hole is constituted by a long hole extending in the front-rear direction. Thus, when a bending moment is applied to the bumper beam, it is possible to more reliably prevent the fastening member from excessively inhibiting the bending deformation of the bumper beam.

FIG. 1 is a perspective view of a bumper beam and a bumper beam extension. (First embodiment) FIG. 2 is a view in the direction of the arrow 2 in FIG. (First embodiment) FIG. 3 is a three-direction enlarged arrow view of FIG. (First embodiment) 4 is an enlarged sectional view taken along line 4-4 of FIG. (First embodiment) FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. (First embodiment) 6 is an enlarged sectional view taken along line 6-6 of FIG. (First embodiment) 7 is an enlarged sectional view taken along line 7-7 of FIG. (First embodiment) FIG. 8 is a sectional view of the bumper beam extension. (First embodiment) FIG. 9 is a cross-sectional view of a mold for forming a bumper beam. (First embodiment) FIG. 10 is a sectional view of a mold for molding the bumper beam extension. (First embodiment) FIG. 11 is a perspective view of the bumper beam and the bumper beam extension. (Second Embodiment) 12 is a view in the direction of arrow 12 in FIG. (Second Embodiment) FIG. 13 is a 13 direction enlarged arrow view of FIG. (Second Embodiment) 14 is an enlarged cross-sectional view taken along line 14-14 of FIG. (Second Embodiment) FIG. 15 is an enlarged sectional view taken along line 15-15 of FIG. (Second Embodiment) 16 is an enlarged sectional view taken along line 16-16 of FIG. (Second Embodiment) FIG. 17 is a sectional view of the bumper beam extension. (Second Embodiment) FIG. 18 is a sectional view of a mold for molding a bumper beam extension. (Second Embodiment) FIG. 19 corresponds to FIG. (Third embodiment) FIG. 20 is a perspective view of the bumper beam and the bumper beam extension. (Fourth embodiment) FIG. 21 is a view in the direction of arrow 21 in FIG. (Fourth embodiment) 22 is an enlarged sectional view taken along line 22-22 of FIG. (Fourth embodiment) FIG. 23 is an enlarged cross-sectional view taken along line 23-23 of FIG. (Fourth embodiment) 24 is an enlarged sectional view taken along line 24-24 of FIG. (Fourth embodiment)

11 Bumper beam 12 Bumper beam extension 14 Bottom wall 14b Upper wall 14c Lower wall 16 Discontinuous fiber reinforced resin sheet 17 Continuous fiber reinforced resin sheet 18 Discontinuous fiber reinforced resin sheet 33U Upper member 33L Lower member 33a Body portion 33b Side flange 33c Side flange 33d Extension portion 33e Bumper beam mounting portion 33g Locking wall 33i Reinforcement rib 33j Groove portion 33k Mounting flange 33m Folding portion 33n Folding portion 33o Fixing hole 34 Rivet (fastening member)
35 Rivet (fastening member)
36 Front side frame (relatively high strength frame)
37 Lower member (relatively low strength frame)
40 Virtual rectangular cross section 41 Back plate a1 Edge line a2 Edge line b Edge line c1 First edge line c2 Second edge line c3 Third edge line

  Embodiments of the present invention will be described with reference to the accompanying drawings. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to an occupant seated in the driver's seat.

First embodiment

  First, the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, bumper beams 11 made of fiber reinforced resin are arranged in the vehicle width direction at the front of the vehicle body, and both ends of the bumper beam 11 in the vehicle width direction are made of fiber reinforced resin. A pair of bumper beam extensions 12 and 12 are supported at the front ends. A pair of left and right lower members 37, 37 extending in the front-rear direction are juxtaposed on the outer side in the vehicle width direction of the pair of left and right front side frames 36, 36 extending in the front-rear direction, and the front side frame 36 on the inner side in the vehicle width direction and the vehicle width direction The rear end of the bumper beam extension 12 is supported on the front end of the outer lower member 37. In the present embodiment, the front side frame 36 is made of metal and the lower member 37 is made of fiber reinforced resin, but the material thereof is arbitrary.

  The bumper beam 11 is a member having a W-shaped cross section in which an upper beam section 14U and a lower beam section 14L, which are U-shaped cross sections that are open toward the front, are vertically coupled. The upper beam section 14U and the lower beam section 14L are A bottom wall 14a located at the rear end, an upper wall 14b extending forward from the upper end of the bottom wall 14a, a lower wall 14c extending forward from the lower end of the bottom wall 14a, and upward from the front end of the upper wall 14b of the upper beam portion 14U An upper flange 14d extending downward, a lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L, and an intermediate connecting the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction. And a flange 14f.

  Further, the upper beam portion 14U and the lower beam portion 14L of the bumper beam 11 extend in the vertical direction and the front-rear direction so as to connect the upper wall 14b, the bottom wall 14a, and the lower wall 14c, respectively, at positions near the outer ends in the vehicle width direction. Two vertical ribs 14j and 14j are formed, and the upper beam portion 14U and the lower beam portion 14L are connected to the outer ends in the vehicle width direction so as to connect the upper wall 14b, the bottom wall 14a, and the lower wall 14c, respectively. One end wall 14k extending in the direction and the front-rear direction is formed. Note that the upper flange 14d and the lower flange 14e are not formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k (see FIG. 1).

  As shown in FIG. 2, the bumper beam 11 having the above configuration includes a central curved portion A that is concavely curved toward the front in a predetermined range in the center in the vehicle width direction, and a front side on both sides of the central curved portion A in the vehicle width direction. A left and right curved portion B, B that curves in a convex shape toward the vehicle, and the left and right curved portion B is located on the outer side in the vehicle width direction and is connected to the bumper beam extension 12; A load input portion B2 that is located on the inner side in the vehicle width direction and protrudes most forward in the bumper beam 11 is provided.

  As shown in FIG. 4, the bumper beam 11 is configured by laminating a continuous fiber reinforced resin sheet 15 positioned on the rear surface side and a discontinuous fiber reinforced resin sheet 16 positioned on the front surface side in two layers. The continuous fiber reinforced resin sheet 15 is obtained by consolidating a woven fabric composed of continuous glass fibers oriented in the vehicle width direction and continuous glass fibers oriented in the vertical direction or the front-rear direction orthogonal thereto with a nylon resin. The fiber reinforced resin sheet 16 is obtained by hardening glass discontinuous fibers that are randomly oriented and intertwined with each other with a nylon resin.

  As shown in FIG. 9, the mold 21 for press-molding the bumper beam 11 includes a female mold 22 having concave cavities 22 a and 22 a for molding the rear surface of the continuous fiber reinforced resin sheet 15, and a discontinuous fiber reinforced resin sheet 16. Are formed with male cores 23 having convex cores 23a, 23a, and grooves 23b for forming vertical ribs 14j and end walls 14k are formed in the cores 23a, 23a. With the mold 21 opened, the continuous fiber prepreg 15 ′ and the discontinuous fiber prepreg 16 ′ are disposed between the cavities 22 a and 22 a of the female mold 22 and the cores 23 a and 23 a of the male mold 23 in a preheated state. Is done.

  The prepreg is made of woven fabric such as plain weave and twill weave made of continuous fibers such as carbon fiber, glass fiber and aramid fiber, UD (sheet in which continuous fibers are aligned in one direction), or a mat of discontinuous fibers as a reinforcing material. It is impregnated with a semi-cured thermosetting resin (such as an epoxy resin or a polyester resin) or a thermoplastic resin (such as nylon 6 or polypropylene), and has flexibility to adapt to the shape of the mold. In the case of a thermosetting resin, when a plurality of prepregs are inserted into a mold in a laminated state and heated to, for example, about 130 ° C. while applying pressure, the thermosetting resin is cured and a fiber reinforced resin product is obtained. . In the case of the plastic resin according to the present embodiment, a plurality of preheated prepregs are inserted into a mold in a laminated state, subjected to pressure molding, and then cooled to obtain a fiber reinforced resin product.

  In the present embodiment, the reinforcing material of the continuous fiber prepreg 15 ′ is a woven fabric in which continuous glass fibers are oriented in directions orthogonal to each other, and the reinforcing material of the discontinuous fiber prepreg 16 ′ has a randomly oriented fiber length. It is a nonwoven fabric of glass discontinuous fibers made of long fibers of about 30 mm.

  Therefore, when the female mold 22 and the male mold 23 are clamped, the continuous fiber prepreg 15 ′ is pressed by the cavities 22 a and 22 a of the female mold 22 and the cores 23 a and 23 a of the male mold 23, and a bumper beam having a W-shaped cross section. The rear surface of 11 is molded. At this time, since the discontinuous fiber prepreg 16 ′ can be easily deformed, the discontinuous fiber prepreg 16 ′ sandwiched between the continuous fiber prepreg 15 ′ and the cores 23 a and 23 a of the male mold 23 is the continuous fiber prepreg 15 ′. Are laminated in the form of a thin film along the front surface, and flow into the grooves 23b of the cores 23a, 23a to simultaneously form the longitudinal ribs 14j and the end walls 14k. And the bumper beam 11 is completed by cut | disconnecting the excess part which protruded on the outer periphery of the bumper beam 11 taken out from the metal mold | die 21. FIG.

As shown in FIGS. 1, 3, and 5 to 7, the bumper beam extension 12 includes an upper member 33U and a lower member 33L having vertically symmetric shapes, and a U-shaped cross section of the upper member 33U and the lower member 33L. The main body portions 33a, 33a having the side flanges 33b, 33b formed at the outer end in the vehicle width direction and the side flanges 33c, 33c formed at the inner end in the vehicle width direction are overlapped and joined together by a rivet 34. By doing so, it is comprised by the box-shaped closed cross section penetrated in the front-back direction. Of the two rivets 34 for fastening the side flanges 33c, 33c on the inner side in the vehicle width direction, the one at the foremost end is among the three rivets 34 ... for fastening the side flanges 33b, 33b on the outer side in the vehicle width direction. It is located behind the one at the front end. (See Figure 3)
Triangular extensions 33d and 33d project from the front ends of the side flanges 33c and 33c on the inner side in the vehicle width direction toward the inner side in the vehicle width direction. The front ends of the extension portions 33d and 33d extend from the front ends of the main body portions 33a and 33a. Bumper beam mounting portions 33e and 33e are formed so as to straddle the two. The bumper beam mounting portion 33e of the upper member 33U rises upward from the main body portion 33a by the step portion 33h and extends forward, and the portion extending forward is overlapped with the upper surface of the upper wall 14b of the upper beam portion 14U of the bumper beam 11. It is fixed with four rivets 35. Similarly, the bumper beam mounting portion 33e of the lower member 33L extends forward after falling down from the main body portion 33a by the step portion 33h, and the portion extending forward is the lower surface of the lower wall 14c of the lower beam portion 14L of the bumper beam 11. And are fixed with four rivets 35.

  At the front edge of the bumper beam mounting portion 33e connected to the front side of the extension portion 33d, a notch 33f cut out in a U shape toward the rear is formed. Locking walls 33g and 33g that cover the outer end in the vehicle width direction of the bumper beam 11 from the front are formed at the outer end in the vehicle width direction of the bumper beam mounting portions 33e and 33e that are connected to the front side of the main body 33a. Three reinforcing ribs 33i that extend in the front-rear direction are formed on the upper surface of the main body 33a and the bumper beam mounting portion 33e of the upper member 33U, and one groove 33j that is recessed downward in an arc shape on the upper surface of the main body 33a. Is formed. Similarly, three reinforcing ribs 33i that extend in the front-rear direction are formed on the lower surface of the main body portion 33a and the bumper beam mounting portion 33e of the lower member 33L, and one lower surface that is recessed upward in an arc shape on the lower surface of the main body portion 33a. The groove portion 33j is formed.

  A gap α in the front-rear direction is formed between the bottom walls 14a, 14a of the bumper beam 11 and the step portions 33h, 33h of the bumper beam mounting portions 33e, 33e facing the rear (see FIGS. 3 and 6). ). The size of the gap α gradually increases from the outside in the vehicle width direction toward the inside.

  The front side frame 36 is a member having a rectangular closed cross section, and the mounting flange 36a provided at the front end thereof is connected to the mounting flanges 33k and 33k provided at the rear ends of the upper member 33U and the lower member 33L of the bumper beam extension 12. Fastened with four bolts 38. The lower member 37 is a member having a rectangular closed cross section, and a mounting flange 37a provided at the front end thereof is fastened to the mounting flanges 33k and 33k of the upper member 33U and the lower member 33L by two bolts 39.

When viewed in the front-rear direction, a virtual rectangular cross section 40 that substantially overlaps the rectangular closed cross section of the front side frame 36 exists on the inner side in the vehicle width direction than the grooves 33j and 33j of the bumper beam extension 12 (FIG. 5). reference). The virtual rectangular cross section 40 includes two first ridge lines c1 and c1 that are positioned substantially on the extension lines of the upper and lower ridge lines a1 and a1 on the inner side in the vehicle width direction of the front side frame 36, and the vehicle of the front side frame 36. The bumper beam extension 12 includes two upper and lower ridge lines on the inner side in the vehicle width direction of the lower member 37. The bumper beam extension 12 includes two second ridge lines c2 and c2 positioned substantially on the extension lines of the two upper and lower ridge lines a2 and a2 on the outer side in the width direction. Two third ridge lines c3 and c3 are provided which are located approximately on the extension line of b and b.

Two reinforcing ribs 33i and 33i are arranged in parallel between the first ridge line c1 and the second ridge line c2 of the bumper beam extension 12, and the first ridge line c1, the second ridge line c2 and the two reinforcing ribs are arranged. The intervals in the vehicle width direction of 33i and 33i are set to be equal (see FIG. 5). Further, the longitudinal ribs 14j and 14j on the inner side in the vehicle width direction of the bumper beam 11 are arranged on the extension line of the first ridge line c1, and the vertical ribs 14j and 14j on the outer side in the vehicle width direction of the bumper beam 11 are on the extension line of the second ridge line c2. Be placed.

  As shown in FIG. 8, the upper member 33U and the lower member 33L having the above-described configuration are configured such that the radially inner portion thereof is composed of the continuous fiber reinforced resin sheet 17, and the radially outer portion thereof is the discontinuous fiber reinforced resin sheet 18. Consists of.

  As shown in FIG. 10, the mold 24 for press-molding the upper member 33U or the lower member 33L of the bumper beam extension 12 has a convex shape for molding the continuous fiber reinforced resin sheet 17 located on the inner surface side of the bumper beam extension 12. A male mold 25 having a core 25a and a female mold 26 having a concave cavity 26a for molding the discontinuous fiber reinforced resin sheet 18 located on the outer surface side of the bumper beam extension 12 are provided. Are formed, and a convex portion 26c for forming the groove portion 33j is formed, and a concave portion 25b for forming the groove portion 33j is formed in the core 25a. The discontinuous fiber prepreg 18 ′ and the continuous fiber prepreg 17 ′ are sandwiched and pressed between the cavity 26 a of the female mold 26 and the core 25 a of the male mold 25, and the same as in the case of the bumper beam 11 described above. The upper member 33U and the lower member 33L of the bumper beam extension 12 are formed.

  At this time, the reinforcing ribs 33i of the upper member 33U and the lower member 33L are easily molded by the discontinuous fiber prepreg 18 'having good moldability.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  When the bumper beam of the host vehicle collides with the bumper beam of another vehicle in the front, the conventional bumper beam that is simply convexly curved forward has a collision load at one center in the vehicle width direction of the bumper beam. A large bending moment acts on the central part of the bumper beam 11 in the vehicle width direction because of the concentrated input, and the area between the part where the bumper beam is fixed to the bumper beam extension and the input point of the collision load is S-shaped. May be twisted (sheared) so as to be bent, and the bumper beam having a W-shaped cross section may open and break easily.

  On the other hand, as shown in FIG. 2, the bumper beam 11 of the present embodiment includes a central curved portion A that is curved concavely toward the front, and thus a pair of load input portions on both sides of the central curved portion A in the vehicle width direction. The leading ends of B2 and B2 collide with the bumper beam of the other vehicle, and the collision load F is intensively input to two points at the leading ends of the pair of load input portions B2 and B2. As a result, not only the maximum value of the bending moment acting on the bumper beam 11 is reduced, but also in a region sandwiched between the ends (input points of the load F) of the pair of load input portions B2 and B2 including the central curved portion A. A tensile load is applied, a compressive load is applied to the bumper beam extension connection parts B1 and B1, and only a narrow region sandwiched between the bumper beam extension connection parts B1 and B1 and the tip ends of the load input parts B2 and B2 is twisted. (Shear) deformation is caused, and the opening of the bumper beam 11 due to torsional deformation is suppressed, and the breaking strength is increased.

  Further, when a collision load from the front is input to the bumper beam 11, the bumper beam 11 between the left and right deformation centers is deformed so as to bend backward (see the chain line in FIG. 2). Acts, and a compressive load acts on the front side of the bumper beam 11 (see FIG. 4).

  According to the present embodiment, the rear surface side of the bumper beam 11 on which the tensile load acts is constituted by the continuous fiber reinforced resin sheet 15 strong against the tensile load, and the continuous fiber reinforced resin sheets 15 are oriented in directions orthogonal to each other. Among the formed continuous fibers, the continuous fibers particularly oriented in the vehicle width direction resist the tensile load, thereby increasing the strength against bending deformation while reducing the weight of the bumper beam 11 and improving the collision energy absorption performance. be able to.

  Further, according to the present embodiment, the front surface side of the bumper beam 11 on which the compressive load acts is composed of the discontinuous fiber reinforced resin sheet 16 that is strong against the compressive load, and the discontinuous fibers that are randomly oriented and intertwined are compressed. It is possible to further improve the collision energy absorption performance by increasing the strength against bending deformation while reducing the weight of the bumper beam 11.

  By the way, as shown in FIG. 2, when a collision load F is input to the bumper beam 11, the bending moment acting on the bumper beam 11 gradually decreases from the input point of the collision load F toward the outside in the vehicle width direction. It becomes a minimum value at the deformation center of the beam 11 and gradually increases from there toward the outside in the vehicle width direction. As apparent from the bending moment diagram of FIG. 3, the largest bending moment M acts on the input point of the collision load F, and this maximum bending moment M is from the deformation center of the bumper beam 11 to the input point of the collision load F. Since it increases in proportion to the distance L, in order to reduce the maximum bending moment M, it is desirable to move the deformation center of the bumper beam 11 inward in the vehicle width direction.

  According to the present embodiment, in the portion where the bumper beam extension 12 supports the bumper beam 11, the extension portions 33d and 33d are projected from the main body portions 33a and 33a of the bumper beam extension 12 to the inside in the vehicle width direction. Since the bumper beam mounting portions 33e and 33e formed so as to straddle the 33a and the extension portions 33d and 33d are fixed to the bumper beam 11 with the rivets 35, the extension portions 33d and 33d are protruded inward in the vehicle width direction. The deformation center of the bumper beam 11 can be moved inward in the vehicle width direction, and the maximum bending moment M acting on the bumper beam 11 by shortening the distance L from the deformation center of the bumper beam 11 to the input point of the collision load F. Can be reduced.

  As a result, the bumper beam 11 is reduced in weight and reduced in weight, and the bumper beam 11 is prevented from being broken at a stretch due to a large bending moment when a collision load is input. The collision energy can be effectively absorbed by bending backward between the twelve.

  However, if the bumper beam 11 is too firmly fixed to the bumper beam extension 12, the bumper beam 11 is prevented from bending backward when a collision load is input, and the impact energy absorption effect may be reduced. In addition to the bump deformation of the bumper beam 11, the front end of the bumper beam extension 12 collapses inward in the vehicle width direction, and the bumper beam extension 12 is not smoothly crushed by the collision load. May be reduced.

  According to the present embodiment, on the inner side in the vehicle width direction from the deformation center of the bumper beam 11, the bottom walls 14a, 14a on the rear surface of the bumper beam 11 and the front surfaces of the bumper beam mounting portions 33e, 33e of the bumper beam extension 12 are provided. Since the gap α (see FIGS. 3 and 6) is formed between the stepped portions 33h and 33h, when the bumper beam 11 is bent and deformed rearward due to the collision load, the bumper beam 11 remains until the gap α disappears. Bending deformation is not hindered, and collision energy can be effectively absorbed by bending deformation of the bumper beam 11.

  At this time, by forming the notches 33f and 33f at the front ends of the extension portions 33d and 33d of the bumper beam extension 12, the rear bending deformation of the bumper beam 11 can be more reliably performed. Moreover, the front end of the bumper beam extension 12 is prevented from falling inward in the vehicle width direction due to the bending deformation of the bumper beam 11, and the bumper beam extension 12 is moved from the front end side toward the rear end side by the collision load transmitted from the bumper beam 11. By sequentially crushing, the collision energy can be effectively absorbed by the bumper beam extension 12 being crushed.

  The bumper beam mounting portions 33e and 33e of the bumper beam extension 12 are provided with locking walls 33g and 33g for locking the outer end in the vehicle width direction of the bumper beam 11 from the front, so that the bumper beam 11 is deformed from the deformation center of the bumper beam 11 when the vehicle collides. When the outer portion in the vehicle width direction moves forward, the movement is prevented by the locking walls 33g, 33g, and the collision load is efficiently transmitted from the bumper beam 11 to the bumper beam extension 12, so that the bumper beam extension 12 is transmitted. The amount of energy absorption can be increased by promoting crushing in the front-rear direction.

  Moreover, the main body portions 33a and 33a of the bumper beam extension 12 constituting the closed section include first to third ridgelines c1 to c3 extending in the front-rear direction (see FIGS. 3 and 5), and the first to third ridgelines c1 to c3. Since the extension line passes through the bottom walls 14a and 14a of the bumper beam 11, a collision load is applied to the main body portions 33a and 33a of the bumper beam extension 12 from the bottom walls 14a and 14a of the bumper beam 11 that moves backward when the vehicle collides. When input, the collision load can be supported by the in-plane force (shearing force) of the body portions 33a and 33a of the bumper beam extension 12, and the bumper beam extension 12 is sequentially crushed from the front end toward the rear end by the collision load. Thus, the amount of energy absorption can be increased.

  Then, after the bumper beam 11 is retracted and the gap α disappears, the deformation center of the bumper beam 11 moves inward in the vehicle width direction as described above, so that an excessive bending moment acts on the bumper beam 11. Can be prevented, and the breakage of the bumper beam 11 can be avoided.

  By the way, when a collision load is transmitted from the bumper beam 11 to the bumper beam extension 12, and the collision load is transmitted from the bumper beam extension 12 to the relatively high strength front side frame 36 and the relatively low strength lower member 37. If the relatively low-strength lower member 37 is destroyed first, the bumper beam extension 12 is inclined outward in the vehicle width direction, and the collision energy absorption effect may not be obtained.

However, according to this embodiment, the bumper beam extension 12 is provided with a virtual rectangular cross section 40 which is located on the extension of the rectangular cross-section the front side frame 36, a virtual rectangular cross section 40, the front side frame Two first ridgelines c1 and c1 that are located approximately on the extension line of the two upper and lower ridgelines a1 and a1 on the inner side in the vehicle width direction of 36, and the two upper and lower ridgelines a2 and a2 on the outer side in the vehicle width direction of the front side frame 36. generally a second ridge line c2, c2 of the two located on the extension, and the bumper beam extension 12 in the vehicle width direction inner side of the lower member 37 of rectangular cross section two upper and lower ridge lines b, on approximately an extension line of b in Since the two third ridge lines c3 and c3 are located, the collision load transmitted from the bumper beam 11 to the bumper beam extension 12 is reduced. That is, the amount of load transmitted from the two first ridgelines c1 and c1 and the two second ridgelines c2 and c2 of the virtual rectangular cross section 40 of the bumper beam extension 12 to the high-strength front side frame 36 is increased, and The amount of load transmitted from the two third ridge lines c3 and c3 of the bumper beam extension 12 to the lower strength lower member 37 is reduced.

  As a result, it is possible to distribute the load corresponding to the strength to the relatively high strength front side frame 36 and the relatively low strength lower member 37, and one of the front side frame 36 and the lower member 37 is It is possible to avoid the situation where the bumper beam extension 12 is tilted first, and the bumper beam extension 12 is tilted, and the bumper beam extension 12 can be stably collapsed, and the impact energy absorption effect can be enhanced.

  The bumper beam extension 12 includes main body portions 33a and 33a of the upper member 33U and the lower member 33L having a U-shaped cross section, side flanges 33b and 33b on the outer side in the vehicle width direction, and side flanges 33c and 33c on the inner side in the vehicle width direction. The upper and lower bumper beam mounting portions 33e and 33e extending in the direction away from the front ends of the main body portions 33a and 33a of the upper member 33U and the lower member 33L are connected to the upper wall 14b and the lower wall of the bumper beam 11. 14c, since the strength of the bumper beam extension 12 is gradually increased from the bumper beam mounting portions 33e and 33e toward the main body portions 33a and 33a, and the collision load is input from the bumper beam 11, By preventing the sudden rise The bumper beam extension 12 are sequentially collapsed toward the rear end from the front end can be enhanced absorption effect of the collision energy.

  The bumper beam extension 12 includes two reinforcing ribs 33i and 33i extending in the front-rear direction on the upper wall and the lower wall of the main body portion 33a sandwiched between the first ridgeline c1, c1 and the second ridgeline c2, c2. Since the first ridgeline c1, c1, the second ridgeline c2, c2 and the reinforcing ribs 33i, 33i are arranged at equal intervals in the vehicle width direction, the surface rigidity of the bumper beam extension 12 is made uniform in the vehicle width direction, and the collision load is reduced. The bumper beam extension 12 can be sequentially crushed from the front end to the rear end at the time of input to enhance the impact energy absorption effect.

  Further, since the reinforcing ribs 33i are connected from the main body portion 33a to the bumper beam mounting portion 33e via the bent portion of the step portion 33h, the strength of the bumper beam extension 12 is increased by the reinforcing rib 33i having the bent portion, and When a collision load is transmitted from the bumper beam 11, the collapse of the bumper beam extension 12 can be started with the breakage of the bent portion of the reinforcing rib 33i.

  Further, the bumper beam 11 includes vertical ribs 14j that are respectively positioned in front of the inner wall in the vehicle width direction and the outer wall in the vehicle width direction of the virtual rectangular cross-section 40. Therefore, the collision load input to the bumper beam 11 is applied to the bumper beam 11. It is possible to efficiently transmit from the longitudinal ribs 14j to the vehicle width direction inner wall and the vehicle width direction outer wall of the virtual rectangular cross section 40 of the bumper beam extension 12 to enhance the impact energy absorption effect.

  Further, the bumper beam extension 12 includes a continuous fiber reinforced resin sheet 17 in which continuous fibers are oriented at least in the vehicle width direction, and the upper member 33U and the lower member 33L have groove portions 33j having arcuate cross sections and extending in the front-rear direction. In addition to enhancing the impact energy absorption effect by increasing the strength of the bumper beam extension 12 by the groove portion 33j, the tensile load applied to the continuous fiber of the groove portion 33j having an arcuate cross section at the time of molding is reduced compared to the groove portion having a square cross section. The strength of the bumper beam extension 12 can be ensured by preventing breakage of the continuous fiber.

  Further, the rivets 34 for fastening the side flanges 33c, 33c on the inner side in the vehicle width direction are arranged rearward of the rivets 34 for fastening the side flanges 33b, 33b on the outer side in the vehicle width direction. The strength of the inner part in the vehicle width direction is reduced, the bumper beam 11 is allowed to bend when the collision load is input, and the impact energy absorption effect is enhanced. The impact energy absorption effect can be enhanced.

  The bumper beam extension 12 is configured by hot pressing a continuous fiber reinforced resin sheet 17 containing continuous fibers and a discontinuous fiber reinforced resin sheet 18 containing discontinuous fibers in a laminated state, and side flanges 33b, 33b, 33c, 33c. Is fastened by the rivets 34 at the portion including the continuous fiber reinforced resin sheet 17, so that the side flanges 33 b, 33 b, 33 c, and 33 c break around the rivets 34. By blocking at 17, the upper member 33U and the lower member 33L of the bumper beam extension 12 can be prevented from separating.

  Further, since the bumper beam attaching portions 33e and 33e of the bumper beam extension 12 are mechanically coupled to the upper wall 14b and the lower wall 14c of the bumper beam 11, the coupling strength and the assembling property can be improved.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIGS. Members corresponding to those of the first embodiment described above are denoted by the same reference numerals, detailed description thereof is omitted, and description of actions obtained similarly is also omitted.

  As shown in FIGS. 11 to 13, bumper beams 11 made of fiber reinforced resin are arranged in the vehicle width direction at the front of the vehicle body of the automobile, and both ends of the bumper beam 11 in the vehicle width direction are made of fiber reinforced resin. The bumper beam extension 12 is supported by the front ends of the pair of bumper beam extensions 12 and 12 and the back plate 41 made of a flat metal plate is sandwiched between the front side frame 36 inside the vehicle width direction and the lower member 37 outside the vehicle width direction. The rear end is supported.

  As shown in FIG. 17, folded portions 33m and 33n folded upward by 90 ° are formed at the end portions of the side flanges 33b and 33c of the upper member 33U of the bumper beam extension 12 so as to be turned upward. Folded portions 33m and 33n are formed at the end portions of the side flanges 33b and 33c in the vehicle width direction and folded back 90 °.

  The front side frame 36 is a member having a rectangular closed cross section, and the mounting flange 36a provided at the front end thereof is connected to the mounting flanges 33k and 33k provided at the rear ends of the upper member 33U and the lower member 33L of the bumper beam extension 12. The bolts 38 are fastened with the back plate 41 interposed therebetween. The lower member 37 is a member having a rectangular closed cross section, and two bolts 39 in a state where the mounting flange 37a provided at the front end sandwiches the back plate 41 between the mounting flanges 33k and 33k of the upper member 33U and the lower member 33L. It is concluded with….

  As shown in FIG. 18, the mold 24 is formed by press-molding the upper member 33U or the lower member 33L of the bumper beam extension 12. Between the cavity 26a of the female mold 26 and the core 25a of the male mold 25, a discontinuous fiber prepreg is formed. The upper member 33U and the lower member 33L of the bumper beam extension 12 are formed by sandwiching and pressing 18 'and the continuous fiber prepreg 17'.

  At this time, folded portions 33m and 33n extending from the side flanges 33b and 33c of the upper member 33U and the lower member 33L are integrally formed. At this time, like the main body portion 33a, the folded portions 33m and 33n have a two-layer structure in which the inner continuous fiber sheet 27 and the outer discontinuous fiber sheet 28 are laminated, but the folded portions 33m and 33n are discontinuous. The fiber sheet 28 is molded by compression. The continuous fiber sheets 25 of the side flanges 33b and 33c extend to the base ends of the folded portions 33m and 33n, and the discontinuous fiber sheets 28 of the folded portions 33m and 33n are bent at right angles from the ends of the continuous fiber sheets 25. It extends.

  The main body portion 33a of the upper member 33U and the lower member member 33L is configured by laminating the inner continuous fiber sheet 17 and the outer discontinuous fiber sheet 18, but a step portion 33h protruding forward from the front end of the main body portion 33a and The bumper beam attachment portion 33e is formed by compressing only the discontinuous fiber sheet 28. Further, the mounting flange 33k bent at a right angle from the rear end of the main body portion 33a of the upper member 33U and the lower member 33L is also formed by compression of the discontinuous fiber sheet 28. At the base end of the mounting flange 33k, the continuous fiber sheet 25 of the main body portion 33a extends straight rearward and is abutted at a right angle to the back plate 41, and the mounting flange 33k is bent at a right angle from the end of the continuous fiber sheet 25. It extends.

  Next, the operation of the second embodiment of the present invention having the above configuration will be described.

  The bumper beam extension 12 is a bumper extending forward from the main body portions 33a and 33a formed by laminating the inner continuous fiber reinforced resin sheet 17 and the outer discontinuous fiber reinforced resin sheet 18 through the step portions 33h and 33h. Since the bumper beam mounting portions 33e and 33e and the step portions 33h and 33h that are provided with the beam mounting portions 33e and 33e and are fixed to the upper and lower surfaces of the bumper beam 11 are configured by the discontinuous fiber reinforced resin sheet 18, the bumper beam 11 When the input collision load is transmitted to the bumper beam extension 12, the step portions 33h and 33h and the bumper beam mounting portions 33e and 33e made of the discontinuous fiber reinforced resin sheet 18 having a lower rigidity than the continuous fiber reinforced resin sheet 17 are provided. By deforming, the bumper beam 11 is allowed to be bent and collided. Further to increase the absorption effect of Energy, we are possible to avoid damage due to local deformation of the bumper beam 11. Finally, the continuous fiber reinforced resin sheet 17 of the main body portions 33a and 33a of the bumper beam extension 12 supports the collision load from the bumper beam 11, so that the bumper beam extension 12 is crushed in the front-rear direction and the collision energy is effective. Can be absorbed.

  Further, since the bumper beam mounting portions 33e and 33e of the bumper beam extension 12 are mechanically coupled to the upper and lower surfaces of the bumper beam 11 by the rivets 35, it is possible to improve the coupling strength and the assembling property.

The bumper beam extension 12 is a mounting flange 33k is coupled to the back plate 41 provided at the front end of the front side frame 3 6 includes a 33k, the main body portion 33a, 33a continuous fiber-reinforced resin sheet 17 and discontinuous fiber-reinforced resin sheet 18 extends to the rear end of the bumper beam extension 12 in a laminated state, from which only the discontinuous fiber reinforced resin sheet 18 is bent at a right angle to form the mounting flanges 33k, 33k. Therefore, the mounting flange continuous with the main body portions 33a, 33a Compared to the case where the base portions of 33k and 33k are curved, the strength of the base portions of the mounting flanges 33k and 33k can be increased, and the collision energy can be prevented by preventing the bumper beam extension 12 from tilting when a collision load is input. Can improve the absorption effect.

  Moreover, when the bumper beam extension 12 is molded, tension is applied to the continuous fibers of the continuous fiber reinforced resin sheet 17 by the discontinuous fiber reinforced resin sheet 18 that is compressed and flows toward the mounting flanges 33k and 33k. Deflection of continuous fibers can be removed.

  Further, the bumper beam extension 12 is configured by connecting side flanges 33b and 33c provided at end portions in the vehicle width direction of the upper member 33U and the lower member 33L having a U-shaped cross section, and the combined side flange 33b, Since the folded portions 33m and 33n that are bent at right angles in the direction away from each other are formed at the end in the vehicle width direction of 33c, compared to the case where the folded portions 33m and 33n that are continuous to the side flanges 33b and 33c are curved. Further, the effect of reinforcing the side flanges 33b and 33c by the folded portions 33m and 33n is enhanced, and the bumper beam extension 12 is deformed at the side flanges 33b and 33c when the collision load is input, thereby impairing the effect of absorbing the collision energy. Can be prevented.

  Further, the continuous fiber reinforced resin sheet 17 and the discontinuous fiber reinforced resin sheet 18 of the main body portions 33a and 33a extend to the end portions in the vehicle width direction of the side flanges 33b and 33c in a laminated state, from which only the discontinuous fiber reinforced resin sheet 18 is provided. Is bent at a right angle to form the folded portions 33m and 33n, so that the effect of reinforcing the side flanges 33b and 33c by the folded portions 33m and 33n can be further enhanced. Moreover, when the bumper beam extension 12 is formed, tension is applied to the continuous fibers of the continuous fiber reinforced resin sheet 17 by the discontinuous fiber reinforced resin sheet 18 flowing toward the folded portions 33m and 33n, and the continuous fibers of the continuous fiber reinforced resin sheet are bent. Can be removed.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG. Members corresponding to the above-described embodiment are indicated using the same reference numerals.

  In the above-described embodiment, the bumper beam extension 12 and the bumper beam 11 are fixed by the rivets 35. However, in the present embodiment, the bumper beam extension 12 and the bumper beam 11 are fixed by vibration welding. In the vibration welding, particularly when discontinuous fiber reinforced resin sheets are welded to each other, the bonding strength becomes high. Therefore, in this embodiment, the second discontinuous fiber reinforced resin sheet 16 is laminated on the upper and lower surfaces of the bumper beam 11, and the bumper The discontinuous fiber reinforced resin sheet 18 of the beam extension 12 and the discontinuous fiber reinforced resin sheet 16 of the bumper beam 11 are vibration welded.

  According to the present embodiment, not only the bonding strength is improved by vibration welding of the discontinuous fiber reinforced resin sheets 16 and 18, but also mechanical coupling means such as rivets are not required, and the number of parts is reduced.

Fourth embodiment

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. Members corresponding to the above-described embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and description of actions obtained similarly is also omitted.

  As shown in FIGS. 20 and 21, a bumper beam 11 made of fiber reinforced resin is arranged in the vehicle width direction at the front of the vehicle body, and both ends of the bumper beam 11 in the vehicle width direction are made of fiber reinforced resin. The bumper beam extensions 12 and 12 are supported at the front ends of the pair of bumper beam extensions 12 and 12, and the rear ends of the bumper beam extensions 12 and 12 are supported at the front ends of the pair of left and right metal front side frames 13 and 13.

  At the front edge of the bumper beam mounting portion 33e connected to the front side of the extension portion 33d, a notch 33f cut out in a U shape toward the rear is formed, and the bumper beam mounting portion 33e and the bumper beam 11 are connected to each other. Of the rivets 35 to be coupled, the fixing hole 33o (see FIG. 21) through which the rivet 35 located on the innermost side in the vehicle width direction passes is a long hole extending in the front-rear direction. Locking walls 33g and 33g that cover the outer end in the vehicle width direction of the bumper beam 11 from the front are formed at the outer end in the vehicle width direction of the bumper beam mounting portions 33e and 33e that are connected to the front side of the main body 33a.

A gap α in the front-rear direction is formed between the bottom walls 14a, 14a of the bumper beam 11 and the step portions 33h, 33h of the bumper beam mounting portions 33e, 33e facing the rear (see FIGS. 21 and 23). ). The size of the gap α gradually increases from the outside in the vehicle width direction toward the inside. The main body portion 33a formed on the closed section of the bumper beam extension 12, 33a is provided with a ridge c ... extending in the longitudinal direction at the four corners of the cross section (see FIGS. 21 and 2 2), the ridge line c ... The extended line extending forward passes through the bottom walls 14 a and 14 a of the bumper beam 11.

  Next, the operation of the fourth embodiment of the present invention having the above configuration will be described.

  According to the present embodiment, the bottom walls 14a and 14a on the rear surface of the bumper beam 11 and the front surfaces of the bumper beam mounting portions 33e and 33e of the bumper beam extension 12 are located on the inner side in the vehicle width direction than the bending center of the bumper beam 11. Since the gap α (see FIGS. 21 and 23) is formed between the step portions 33h and 33h, when the bumper beam 11 is bent backward and deformed due to a collision load, the bumper beam 11 remains until the gap α disappears. Bending deformation is not hindered, and collision energy can be effectively absorbed by bending deformation of the bumper beam 11.

  At this time, out of the rivets 35 for fastening the bumper beam 11 and the bumper beam extension 12, the fixing holes 33o and 33o of the bumper beam extension 12 through which the rivet 35 located on the innermost side in the vehicle width direction passes are elongated holes extending in the front-rear direction. In addition, since the notches 33f and 33f are formed at the front ends of the extension portions 33d and 33d of the bumper beam extension 12, the bending deformation of the bumper beam 11 to the rear can be more reliably performed. Moreover, the front end of the bumper beam extension 12 is prevented from falling inward in the vehicle width direction due to the bending deformation of the bumper beam 11, and the bumper beam extension 12 is moved from the front end side toward the rear end side by the collision load transmitted from the bumper beam 11. By sequentially crushing, the collision energy can be effectively absorbed by the bumper beam extension 12 being crushed.

  The bumper beam mounting portions 33e and 33e of the bumper beam extension 12 are provided with locking walls 33g and 33g for locking the outer end in the vehicle width direction of the bumper beam 11 from the outside in the front-rear direction, so that the bumper beam 11 is deformed when the vehicle collides. When the outer portion in the vehicle width direction from the center moves forward, the movement is blocked by the locking walls 33g, 33g, and the collision load is efficiently transmitted from the bumper beam 11 to the bumper beam extension 12, so that the bumper beam The amount of energy absorption can be increased by promoting crushing of the extension 12 in the front-rear direction.

  Further, the main body portions 33a, 33a of the bumper beam extension 12 constituting the closed cross section are provided with ridge lines c extending in the front-rear direction (see FIGS. 21 and 22), and the extended lines of the ridge lines c are the bottom walls 14a of the bumper beam 11. 14a passes through the bottom walls 14a, 14a of the bumper beam 11 that moves rearward when the vehicle collides, and when a collision load is input to the body portions 33a, 33a of the bumper beam extension 12, the collision load is applied to the bumper beam extension 12. It is possible to support by the in-plane force (shearing force) of the main body portions 12a and 12a, and the bumper beam extension 12 can be sequentially crushed from the front end toward the rear end by the collision load, thereby increasing the energy absorption amount.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the relatively high-strength frame is the front side frame 36 and the relatively low-strength frame is the lower member 37, but the relatively high-strength frame is the lower member 37, Alternatively, the front side frame 36 may be a low-strength frame.

  In the embodiment, the front bumper beam 11 has been described. However, the present invention can also be applied to a rear bumper beam. In the case of a front bumper beam, the outer side in the front-rear direction corresponds to the front, and in the case of the rear bumper beam, the outer side in the front-rear direction corresponds to the rear.

  Further, the bumper beam 11 of the embodiment has a W-shaped cross section that opens outward in the front-rear direction, but the bumper beam 19 of the present invention has a U-shaped (or U-shaped) cross section that opens outward in the front-rear direction. It may have.

  The relatively high strength frame of the present invention is not limited to the front side frame 36 of the embodiment, and the relatively low strength frame of the present invention is limited to the lower member 37 of the embodiment. is not.

  The fastening member of the present invention is not limited to the rivet 34 of the embodiment, and may be a bolt.

  Further, the number of reinforcing ribs 33i of the upper member 33U and the lower member 33L is not limited to the embodiment.

  The fastening member of the present invention is not limited to the rivet 35 of the embodiment, and may be a bolt.

Claims (14)

A relatively high-strength frame (36) extending in the front-rear direction and a relatively low-strength frame (37) extending in the front-rear direction are juxtaposed side by side in the vehicle width direction, and the relatively high-strength frame ( 36) and a bumper beam extension (12) having a hollow closed cross section made of fiber reinforced resin is fixed to the outer ends in the front-rear direction of the relatively low strength frame (37), and the pair of left and right bumper beam extensions (12) A bumper for an automobile in which both ends in the vehicle width direction of a bumper beam (11) made of fiber reinforced resin are fixed to the outer ends in the front-rear direction of the vehicle,
The bumper beam extension (12) includes a groove portion (33j) extending in the front-rear direction at an intermediate portion in the vehicle width direction, and two upper and lower first ridge lines (c1) positioned on the inner side in the vehicle width direction, and the groove portion (33j). Two upper and lower second ridgelines (c2) adjacent to the upper and lower two third ridgelines (c3) located on the outer side in the vehicle width direction, the first ridgeline (c1) and the second ridgeline (c2) are Forming a virtual rectangular cross section (40) positioned substantially on the extension line of the relatively high-strength frame (36) having a rectangular cross section, and a first ridge line (c1) of the virtual rectangular cross section (40) ) And the second ridgeline (c2) are two upper and lower ridgelines (a1) on the inner side in the vehicle width direction and two upper and lower ridgelines (a2) on the outer side in the vehicle width direction of the relatively high strength frame (36). The third ridge line is located approximately on the extension line. c3) is positioned substantially on the extension line of the two upper and lower ridge lines (b) on the side of the relatively high strength frame (36) in the vehicle width direction of the relatively low strength frame (37) having a rectangular cross section. ,
The bumper beam extension (12) is formed by fastening the main body portion (33a) of the upper member (33U) and the lower member (33L) having a U-shaped cross section with side flanges (33b, 33c) inside and outside in the vehicle width direction. The upper and lower bumper beam mounting portions (33e) of the main body portion (33a) of the upper member (33U) and the lower member (33L) are configured as an upper wall (14b) and a lower wall (14c) of the bumper beam (11). Automobile bumpers characterized by being connected to each other.   The bumper beam extension (12) includes at least one reinforcement extending in the front-rear direction on the upper wall and the lower wall of the main body (33a) sandwiched between the first ridge line (c1) and the second ridge line (c2). The rib (33i) is provided, and the first ridge line (c1), the second ridge line (c2), and the reinforcing rib (33i) are arranged at equal intervals in the vehicle width direction. The automotive bumper described.   The bumper beam extension (12) includes a continuous fiber reinforced resin sheet (17) in which continuous fibers are oriented at least in the vehicle width direction, and the groove (33j) has an arcuate cross section. The bumper for cars described in 1.   The fastening member (34) for fastening the side flange (33c) on the inner side in the vehicle width direction is disposed on the inner side in the front-rear direction than the fastening member (34) for fastening the side flange (33b) on the outer side in the vehicle width direction. The automobile bumper according to claim 1, wherein:   The bumper beam extension (12) is formed by hot pressing a continuous fiber reinforced resin sheet (17) containing continuous fibers and a discontinuous fiber reinforced resin sheet (18) containing discontinuous fibers in a laminated state, and the side flange The automotive bumper according to claim 1, wherein (33b, 33c) is fastened by a fastening member (34) at a portion including the continuous fiber reinforced resin sheet (17).   The bumper beam attachment portion (33e) of the bumper beam extension (12) is mechanically coupled to the upper wall (14b) and the lower wall (14c) of the bumper beam (11). Automotive bumper.   The bumper beam extension (12) according to claim 1, wherein the bumper beam extension (12) includes an extension portion (33d) extending the inner side in the vehicle width direction of the joint flange (33c). .   The automobile according to claim 1, wherein the bumper beam mounting portion (33e) includes a locking wall (33g) that locks the outer end in the vehicle width direction of the bumper beam (11) from the outside in the front-rear direction. For bumpers. A relatively high-strength frame (36) extending in the front-rear direction and a relatively low-strength frame (37) extending in the front-rear direction are juxtaposed side by side in the vehicle width direction, and the relatively high-strength frame ( 36) and a bumper beam extension (12) having a hollow closed cross section made of fiber reinforced resin is fixed to the outer ends in the front-rear direction of the relatively low strength frame (37), and the pair of left and right bumper beam extensions (12) A bumper for an automobile in which both ends in the vehicle width direction of a bumper beam (11) made of fiber reinforced resin are fixed to the outer ends in the front-rear direction of the vehicle,
The bumper beam extension (12) includes a groove portion (33j) extending in the front-rear direction at an intermediate portion in the vehicle width direction, and two upper and lower first ridge lines (c1) positioned on the inner side in the vehicle width direction, and the groove portion (33j). Two upper and lower second ridgelines (c2) adjacent to the upper and lower two third ridgelines (c3) located on the outer side in the vehicle width direction, the first ridgeline (c1) and the second ridgeline (c2) are Forming a virtual rectangular cross section (40) positioned substantially on the extension line of the relatively high-strength frame (36) having a rectangular cross section, and a first ridge line (c1) of the virtual rectangular cross section (40) ) And the second ridgeline (c2) are two upper and lower ridgelines (a1) on the inner side in the vehicle width direction and two upper and lower ridgelines (a2) on the outer side in the vehicle width direction of the relatively high strength frame (36). The third ridge line is located approximately on the extension line. c3) is positioned substantially on the extension line of the two upper and lower ridge lines (b) on the side of the relatively high strength frame (36) in the vehicle width direction of the relatively low strength frame (37) having a rectangular cross section. ,
The bumper beam extension (12) has a cylindrical closed cross-section main body (33a) extending in the front-rear direction in which a discontinuous fiber reinforced resin sheet (18) is laminated on the outside of an inner continuous fiber reinforced resin sheet (17), An upper and lower bumper beam mounting portion (33e) extending outwardly in the front-rear direction of the discontinuous fiber reinforced resin sheet (18) of the main body portion (33a) toward the bumper beam (11); A bumper for an automobile, wherein a bumper beam mounting portion (33e) is coupled to an upper surface and a lower surface of the bumper beam (11). 10. The automotive use according to claim 9 , wherein the upper and lower bumper beam mounting portions (33 e) are vibration welded to the upper and lower surfaces of the bumper beam (11) made of a discontinuous fiber reinforced resin sheet (16). bumper. The bumper beam extension (12) includes a mounting flange (33k) coupled to a back plate (41) provided at a front end of the relatively high strength frame (36), and is a continuous fiber of the main body (33a). The reinforced resin sheet (17) and the discontinuous fiber reinforced resin sheet (18) extend in a laminated state to the inner end in the front-rear direction of the bumper beam extension (12), from which only the discontinuous fiber reinforced resin sheet (18) is perpendicular. The automobile bumper according to claim 9 or 10 , characterized in that the mounting flange (33k) is formed by being bent in a circle. The bumper beam extension (12) is configured by connecting side flanges (33b, 33c) provided inside and outside the vehicle width direction of the upper member (33U) and the lower member (33L) having a U-shaped cross section. has been said side flanges (33b, 33c) folded portions bent at right angles in the direction away from each other in the vehicle width direction end portion in at least one of (33m, 33n) is characterized by the formation of the, claims 9 to The automobile bumper according to claim 11 . The continuous fiber reinforced resin sheet (17) and the discontinuous fiber reinforced resin sheet (18) of the main body part (33a) extend to the vehicle width direction end of the side flanges (33b, 33c) in a laminated state, and from there The automobile bumper according to claim 12 , wherein only the discontinuous fiber reinforced resin sheet (18) is bent at a right angle to constitute the folded portion (33m, 33n). The bumper beam mounting portion (33e) includes a fixing hole (33o) through which a fastening member (35) for fixing the bumper beam (11) passes, and the fixing hole (33o) is a long hole extending in the front-rear direction. The automobile bumper according to claim 6 , wherein:

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