JP4850862B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure applied to a bumper having a lower impact absorbing member.

Conventionally, a bumper is provided on the front side of a vehicle body in order to absorb an impact at the time of a slight frontal collision of the vehicle. Also, as a function of the bumper, it is necessary to protect pedestrians, and an upper shock absorber is provided in the upper portion of the bumper in the concave portion, and a lower shock absorber having higher rigidity than the upper shock absorber in the lower portion. So that the pedestrian's feet (legs) during collision are absorbed by the upper impact absorber and the lower side of the leg is lifted by the lower impact absorber. In some cases, it can be safely protected from (see, for example, Patent Document 1).
JP 2002-274298 A

  The lower impact absorber of Patent Document 1 is formed in a shape having a certain thickness by providing a longitudinal rib and a lateral rib on the plate-like body in order to ensure sufficient rigidity. The part is fixed to the body frame.

  However, since the lower shock absorber is formed in a shape having a thickness as described above, in order to prevent displacement in the thickness direction, the lower shock absorber has a structure fixed to the vehicle body. The vehicle body side extension portion of the plate-like body is fixed to the lower surface of the vehicle body frame, and a rim portion formed in a bridge shape so as to connect the upper ends of a pair of adjacent ribs is fixed to the upper portion of the vehicle body frame. It is installed. As described above, there are two places where the lower shock absorber is fixed to the vehicle body frame, and there is a problem that repair and replacement performed in the case of minor damage are not easy.

  In addition, since there is a thickness as described above, it is desirable to fix the body frame at two places spaced apart in the vertical direction. Therefore, the body frame is limited to a portion having a certain thickness, and the mounting space is limited. There was a problem that the layout was restricted such as securing.

In order to solve such a problem and realize an automobile bumper that can be easily repaired and replaced and has a high installation space efficiency, in the present invention, the vehicle body of the bumper (31) is designed to absorb collision energy. (1) A vehicle body front structure having a lower impact absorbing member (37) provided on the side and at the lower side, wherein the lower member (13a) of the front bulkhead (13) forms a plate material in a U-shaped cross-sectional shape. The U-shaped cross-section member (34) and the lid-shaped member (35) formed of a plate material so as to shield the opening of the U-shaped cross-section member (34), and both the members (34, 35). ) Of the flanges (34a, 35a) formed outward at the respective edge portions are fixed to each other to form a closed cross-sectional shape, and one of the flanges (34a, 35a) is the bumper. (31) side to Is long, the lower impact absorbing member (37) is made of synthetic resin, it has an opening (37f) for inserting the extended portions of said flange (36) downwards, inserted through the opening (37f) mouth The base end portion (37e) of the lower impact absorbing member (37) on the side of the lower member (13a) is fixed on the upper surface of the extended portion (36) of the flange so that the upper and lower sides of the vehicle body A wall surface that is held in a direction and faces the bumper (31) of the lower member (13a) along the lower surface of the extended portion (36) of the flange from the fixed portion of the base end portion (37e) An extended portion (37d) formed so as to reach (39), and against a load from the front, the fixed portion and an impact of the extended portion on the wall surface of the lower member; It was supposed to be received by.

In particular, the extended portion (37d) of the lower impact absorbing member (37) has a rib (41) formed in a stepped shape lowered by one step and provided on the upper surface of the step, and an extended portion of the flange. An opening (37f) through which (36) is inserted, and an extended portion (36) of the flange is sandwiched between the base end portion (37e) of the lower impact absorbing member (37) and the rib (41) Good to have been. Further, the on the vehicle body front side end portion of the lower impact absorbing member (37), the lower at protrudes toward the rear of the vehicle body the protruding portion of the bumper (31) (31b), convex portions you face the vehicle body vertical direction ( 40) may and are provided.

  According to the first aspect of the present invention, the base end portion of the lower impact absorbing member provided in the bumper is fixed to the flange extension portion of the lower member of the front bulkhead and extends to the bumper side wall surface of the lower member. By having the protruding part, the lower impact absorbing member can be fixed in one place in the longitudinal direction of the vehicle body, and the fixing work can be simplified, making it easy to repair and replace at the time of minor damage. Become. Further, the load applied to the lower impact absorbing member due to the frontal collision can be received by the extended portion hitting the wall surface of the lower member, and there is no problem even if the one place is fixed.

  According to the second aspect, since the extended portion of the flange of the member constituting the lower member is sandwiched between the base end portion and the rib of the lower impact absorbing member, the base end portion is used as a flange in the vehicle vertical direction. Even if the structure is stopped at one place, the lower impact absorbing member can be stably held. According to the third aspect of the present invention, even if a force that raises the lower impact absorbing member at the time of a collision is applied, the convex portion strikes the bumper and further jumping is prevented. The base end portion of the lower portion of the lower member surely strikes against the bumper side wall surface of the lower member, and the pedestrian can be removed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an entire frame of a passenger car-type vehicle to which the present invention is applied as viewed obliquely from the front, and FIG. 2 is an enlarged cross-sectional view of a main part showing a front portion of a vehicle body viewed from the arrow II line of FIG. is there.

  As shown in FIG. 1, the vehicle body structure of the present embodiment has left and right front side frames 11, 12 extending in the longitudinal direction of the vehicle body and front side frames 11, 12 as skeleton strength members at the front of the vehicle body 10. And a rectangular front bulkhead 13 coupled in a state of being fitted between the front end portions (front side of the vehicle body), and an engine room 14 is defined inside these. Note that left and right extensions 11a and 12a extending in front of the vehicle body are coupled to the front side of the vehicle body of the front side frames 11 and 12, respectively. Are combined. The left and right front side frames 11 and 12 are fixedly joined at their rear ends to the front ends of the left and right side sill members 17 and 18 by outriggers 15 and 16, respectively.

  In addition, left and right members 21 and 22 that extend obliquely downward from the left and right front pillars 19 and 20 and reach the vicinity of the front end portions of the left and right front side frames 11 and 12 respectively are disposed. Front end portions of the vehicle bodies of the left and right front side frames 11 and 12 and the left and right members 21 and 22 are integrally coupled via a connecting member 25. In the space defined by the left and right members 21 and 22 and the left and right front side frames 11 and 12, left and right wheel houses 23 and 24 for front wheels are provided.

  Each skeleton strength member may be a rectangular cross section formed of, for example, a U-shaped cross-section member and a plate-like member, and this shape is known as a skeleton strength member of a vehicle body, and detailed description thereof is omitted. .

  FIG. 2 is a view showing a state in which a bumper 31, a radiator 32, and a capacitor 33 are disposed in addition to the skeleton member. The bumper 31 is coupled to the front bulkhead 13 via a bracket (not shown), the radiator 32 is supported via a bracket (not shown) so as to fit within the rectangular frame of the front bulkhead 13, and the capacitor 33 is also front-mounted. The bulkhead 13 may be supported via a bracket (not shown).

  As shown in FIG. 2, the lower member 13a extending in the vehicle width direction on the lower side of the vehicle body of the front bulkhead 13 is formed in a U-shaped cross section that opens a steel plate as a plate material and presses it upward. The U-shaped cross-sectional member 34 and a lid-shaped member 35 that is also formed of a steel plate and is superimposed on the U-shaped cross-sectional member 34 so as to shield the opening of the U-shaped cross-sectional member 34. The flanges 34a and 35a that extend outward (toward the longitudinal direction of the vehicle body) with respect to the rectangular closed cross-sectional shape formed by the members 34 and 35 are formed on both edges of the members 34 and 35, respectively. Yes. A lower member 13a having a rectangular closed cross-sectional shape is formed by welding the flanges 34a and 35a facing each other.

  And the flange 35a of the lid-shaped member 35 which is a part of flange 34a * 35a extended to the vehicle body front side of the lower member 13a is formed longer than the opposing flange 34a. A base end portion 37e on the lower member 13a side of a synthetic resin shock absorbing plate 37 as a lower shock absorbing member is coupled to the extended portion 36 as an extended portion of the flange 35a.

  As shown in FIG. 3, the shock absorbing plate 37 includes a plate-like portion 37a formed long in the vehicle width direction corresponding to the lower member 13a, and a back surface of the plate-like portion 37a on the vehicle body lower side. It is formed in a shape having a rib 37b projecting downward. A base end portion 37e is provided on the lower member 13a side of the plate-like portion 37a, and a plurality of holes 37c penetrating in the thickness direction at intervals in the vehicle width direction are provided at the rear edge portion.

  Further, as shown in FIG. 4 showing the shock absorbing plate 37 broken along the line IV-IV in FIG. The same number of holes 36a are provided corresponding to 37c. The shock absorbing plate 37 is fixed to the extension 36 in the vertical direction by clips 38 inserted from above into the corresponding holes 36a and 37c. The clip 38 is formed so as to cut out a part of the shaft portion and protrude outward from the shaft portion, the disc-shaped head portion, the shaft portion integrally and coaxially protruding from the head portion. It may be an industrial fastener that fastens two known members having a plurality of engaging pieces and a push pin that is provided so as to be immersible from the head part into the shaft part and that projects the engaging piece in the immersive state.

  Further, on the lower member 13 a side, which is the rear side of the vehicle body of the shock absorbing plate 37, an opening 37 f is inserted below the base end portion 37 e fixed by the clip 38, and the lower surface of the extension portion 36. An extending portion 37d is formed so as to extend to the wall surface 39 facing the bumper 31 on the vehicle body front side of the lower member 13a. As shown in FIG. 4, the plate-like portion 37a is fixed on the upper surface of the extension portion 36, and the extension portion 37d is positioned below the extension portion 36. The extended portion 37a and the extended portion 37d are formed in a stepped shape in which the extended portion 37d is lowered by one step with respect to the plate-like portion 37a. Further, by providing a rib 41 for sandwiching the extension portion 36 or the flanges 34a and 35a on the upper surface of the extension portion 37d, the shock absorbing plate can be stably fixed with a clip 38 in the vertical direction of the vehicle body. 37 can be held.

  In the shock absorbing plate 37 configured as described above, when the weak load F from the front is applied as shown in FIG. 5, the portion having the lowest rigidity (for example, around the insertion hole 37c of the clip 38). Is deformed and displaced toward the lower member 13a. Then, since the protruding end of the extended portion 37d hits the wall surface 39, the state is maintained unless the load is so large that the shock absorbing plate 37 is buckled. For example, in the case of a pedestrian's foot, the lower side can be lifted so that the upper part of the bumper 31 is a fulcrum, and the pedestrian's foot can be safely protected from a collision.

  In this way, the vertical direction of the vehicle body 1 can be fixed at one location by the clip 38, and the load F can be received by the clip 38 and the wall surface 39 that the extension portion 37d abuts. Even if it is not fixed at two places as in the technology, the lifting support rigidity is ensured.

  Further, at the front end portion of the shock absorbing plate 37, a convex portion 40 is formed integrally with a plurality of plate-like portions 37a protruding upward at a plurality of locations in the vehicle width direction. In the illustrated example, a pair of left and right ribs 40a is further provided on the protruding end surface of the convex portion 40 in order to improve rigidity. Further, an edge forming portion 31b and a protruding portion 40 as protruding portions formed so as to protrude rearward of the vehicle body at the lower portion of the bumper are formed so as to be folded inside the vehicle body so as to form the opening 31a of the bumper 31. Are set to face each other at substantially the same position. As a result, even when the load F is applied and the shock absorbing plate 37 is displaced to the upper side of the vehicle body as shown by the two-dot chain line in FIG. 5, the convex portion 40 (rib 40a) can hit the edge forming portion 31b. Therefore, it is possible to prevent the shock absorbing plate 37 from jumping up at the time of collision.

  Accordingly, the shock absorbing plate 37 is pushed toward the rear lower member 13a side, and the extending portion 37d of the shock absorbing plate 37 extends so as to reach the wall surface 39 along the extension 36 of the lower member 13a as described above. Since it is set as the shape to be made, the extension part 37d can be made to interfere with the lower member 13a, and a pedestrian can be removed. Further, there is no need to fix the extended portion 37d so as to extend to the lower surface of the lower member 13a so as to be sandwiched between the lower member 13a and the lower body portion of the bumper 31. As a result, the number of members protruding downward from the lower surface of the lower member 13 can be minimized (only the lower part of the vehicle body of the bumper 31), and the necessary dimensions in the vertical direction of the vehicle body can be set short. The layout in the vertical direction of the vehicle body can be improved.

  In this way, when removing the shock absorbing plate 37 for repair / replacement with minor damage to the bumper 31 as described above, it is sufficient to simply remove the clip 38, and repair / replacement work is easy. is there. Further, the structure for preventing the shock absorbing plate 37 from jumping up by the abutment between the edge forming portion 31b and the convex portion 40 eliminates the need for fixing the front side portion of the shock absorbing plate 37 to the vehicle body side member. Further simplification can be promoted.

  According to the above structure of the present invention, it is also effective when the bumper 31 is provided with an opening 31a for introducing cooling air as shown in FIG. Although the inside of the bumper 31 on the vehicle body side can be seen through the opening 31a (internal appearance), it can be covered by the plate-like portion 37a of the shock absorbing plate 37, and the design of the plate-like portion 37a should be taken into consideration. This can improve the appearance of the inside appearance.

  It should be noted that a hole 37c is provided in the flanges 34a and 35a of the U-shaped cross-section member 34 and the lid-shaped member 35 that form the closed cross-sectional shape of the lower member 13a, and a shock absorbing plate is inserted through the clip 38. Since 37 is fixed, the fixing operation can be easily performed, and the repair / replacement operation can be more easily performed. Further, since the extension portion 37d is thinner in the vehicle body vertical direction between the extension portion 37d and the lower member 13a, the lower end of the extension portion 37d can be positioned above the lower end of the lower member 13a. Further, it is possible to prevent the ledge from projecting to the lower side of the frame, and the layout can be improved. In addition, the structure provided with the extension portion 36 of the flange 35a eliminates the need to lengthen the lower impact absorbing plate 37 even if the bumper 31 and the lower member 13a of the front bulkhead 13 are separated. Can be assembled easily.

It is the perspective view which looked at the whole flame | frame of the passenger vehicle type vehicle to which this invention was applied from diagonally forward. It is a principal part expanded sectional view which shows the vehicle body front part seen from the arrow II line of FIG. It is a perspective view which shows the impact-absorbing plate based on this invention. It is an expanded sectional view which shows the fixation structure of an impact-absorbing plate. It is a figure corresponding to FIG. 4 which shows a slight collision state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 13 Front bulkhead 13a Lower member 31 Bumper 31b Edge formation part (protrusion part)
34 U-shaped cross-section members 34a and 35a Flange 35 Lid member 36 Extension part (extended part of flange)
37 Lower shock absorbing plate (lower shock absorbing member)
36a and 37c Hole 37d Extension part 37e Base end part 37f Opening 38 Clip 39 Wall surface 40 Convex part 41 Rib

Claims (3)

A vehicle body front structure having a lower impact absorbing member provided on the vehicle body side and lower portion of the bumper to absorb collision energy,
The lower member of the front bulkhead is composed of a U-shaped cross-sectional member in which a plate material is formed in a U-shaped cross-sectional shape, and a lid-shaped member formed from a plate material so as to shield the opening of the U-shaped cross-sectional member, And it is formed in a closed cross-sectional shape by fixing the opposing ones of the flanges formed outward at the respective edges of the two members,
One of the flanges is extended to the bumper side,
The lower impact absorbing member is
Made of synthetic resin,
An opening through which the extended portion of the flange is inserted, and
The base end portion of the lower impact absorbing member on the lower member side is fixed in a mounted state on the upper surface of the extended portion of the flange inserted through the opening , and is held in the vertical direction of the vehicle body. An extending portion formed so as to extend from the fixed portion of the end portion to the wall surface facing the bumper of the lower member along the lower surface of the extended portion of the flange ;
A vehicle body front part structure that receives a load from the front by abutting the fixed portion and the extended portion against the wall surface of the lower member . The extended portion of the lower impact absorbing member has a rib formed in a stepped shape lowered by one step and provided on the upper surface of the step and has an opening through which the extended portion of the flange is inserted.
The vehicle body front structure according to claim 1, wherein the extended portion of the flange is sandwiched between the base end portion of the lower impact absorbing member and the rib. Claims wherein the vehicle front end of the lower impact absorbing member, characterized in that a projecting portion which is protruded toward the rear of the vehicle body at the lower portion of the bumper, and the convex portion you face the vehicle body vertical direction is provided The vehicle body front part structure according to claim 1 or claim 2.

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