JP2007182162A - Front body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve collision energy absorbing performance of a front body in an oblique front collision, while securing rigidity of a bumper beam, and to protect a bumper face. <P>SOLUTION: Front structure of an automobile is provided with a right and a left first clash cans 8 for connecting front ends of a right and a left front side frames 6 and a rear wall 18a of a bumper beam 18 to a rear side of the bumper beam 18, and a right and a left second clash cans 20 structured of a notch part 19 formed so that a front surface of the bumper beam 18 is opened in a part of the bumper beam 18 outside the front side frame 6 in the car cross direction, a main body part 21, on which the rear wall 18a of the bumper beam 18 abuts from the front thereof and projecting forward of the bumper beam 19 through the notch part 19, and a cover part 25 for covering the front surface of the main body part 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front vehicle body structure of an automobile in which left and right crash cans that protrude forward from a bumper beam are provided, and the collision energy absorption performance of the front vehicle body at the time of a collision from an oblique front is improved.

  Conventionally, a front pair of left and right front side frames has been provided at the front of an automobile, and the width of the vehicle via left and right crash cans (frame side crash cans) capable of absorbing collision energy at the front ends of these front side frames. A structure in which bumper beams extending in the direction are connected is the mainstream. When the vehicle crashes, the frame-side crash can is compressed and deformed by the collision load transmitted from the bumper beam to absorb the collision energy, and the front side frame also absorbs the collision energy to absorb the collision energy. Mitigates the impact on the room.

  By the way, as an improvement of the front structure of the automobile, left and right crash cans are further provided on the front side of the bumper beam, and the collision energy is absorbed by the compression deformation of these crash cans at the time of a collision from an oblique front. Japanese Patent Application Laid-Open No. H10-227707 discloses an improvement in the collision energy absorption performance of the vehicle body.

In Patent Document 1, in a bumper beam having a U-shaped cross section having an upper wall, a lower wall, and a rear wall, a front portion of an automobile provided with left and right crash cans protruding forward on the rear wall of the left and right end portions. A structure is disclosed.
DE10143890 publication

The bumper beam of Patent Document 1 is formed in a U-shaped cross-section and has a structure in which the front surface is open. Therefore, the bumper beam is suitable for providing a crash can on the rear wall so as to protrude forward, but ensures sufficient rigidity. It is difficult. Therefore, the collision load received by the bumper beam at the time of the front collision cannot be reliably transmitted to the frame-side crash can, and the frame-side crash can may not be sufficiently crushed, and the collision energy absorption performance of the front body may be reduced. There is.
In addition, since the edges of the left and right ends of the bumper beam are exposed, the bumper face provided in front of the bumper beam collides with the edges of the left and right ends of the bumper beam and breaks the bumper face at the time of collision from diagonally forward. There is a risk of doing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a front vehicle body structure for an automobile that can improve the impact energy absorption performance of the front vehicle body at the time of a collision from an oblique front while securing the rigidity of the bumper beam and can protect the bumper face. Is to provide.

  The front body structure of an automobile according to claim 1 is a front body structure of an automobile having left and right front side frames and a bumper beam having a closed cross-section structure bridged over front ends of the left and right front side frames. A notch portion formed in a state in which the front surface of the bumper beam is open to the outer side in the vehicle width direction from the front side frame of the bumper beam, and a notch that is in contact with the rear wall of the bumper beam from the front. And a left and right crash can configured to cover the front of the crash can main body, and the upper end of the crash can front wall has the bumper at the upper end. It extends upward from the upper edge of the notch in the beam, and the lower end extends downward from the lower edge of the notch in the bumper beam. Characterized in that configured so that.

  A notch is formed in the bumper beam on the outer side in the vehicle width direction from the front side frame so that the front surface of the bumper beam is open, and a crush can is provided in this notch and projects forward from the bumper beam. The bumper face collides with the crash can at the time of collision from the front, and the crash can compresses and collapses to absorb the collision energy, and the front side frame is compressed by the collision load transmitted through the bumper beam. The collision energy is absorbed by deformation. Thereby, the absorption performance of the collision energy of the front vehicle body at the time of the collision from diagonally forward is improved.

  According to a second aspect of the present invention, the left and right frame side crash cans connect the front ends of the left and right front side frames and the rear wall of the bumper beam to the rear side of the bumper beam. It is provided.

  According to a third aspect of the present invention, there is provided a front vehicle body structure in which the bumper face provided in front of the bumper beam is retracted rearward from the central portion in the vehicle width direction. It is formed in a curved shape, and the cutout portion is cut out so as to incline backward toward the outside in the vehicle width direction.

  The front vehicle body structure of an automobile according to claim 4 is the invention according to any one of claims 1 to 3, wherein an upper end portion and a lower end portion of the front wall of the crash can are bent rearward, and an upper wall portion of the bumper beam It is characterized by being joined to the lower wall.

  According to a front vehicle body structure of an automobile according to a fifth aspect of the present invention, in the invention of the fourth aspect, the crash can body includes at least a left vertical wall and a right vertical wall, and the left and right side ends of the crash can front wall are crash cans. The left vertical wall and the right vertical wall of the crush can are configured to extend in the left-right direction, respectively, and the left end vicinity and the right end vicinity of the front wall of the crash can are the front end of the left vertical wall and the front end of the right vertical wall of the crash can. It is characterized by being joined to each other.

  The front body structure of an automobile according to claim 6 includes a beam body having a U-shaped cross section having left and right front side frames, a rear wall, an upper wall, and a lower wall, and a front surface portion of the beam body. A bumper beam that is configured in a closed cross-section with a low-rigidity cover member and bridges across the front end portions of the left and right front side frames, and is disposed on the front side of the bumper beam and outside in the vehicle width direction from the center portion The bumper beam portion corresponding to the outer side in the vehicle width direction than the left and right front side frames is a bumper face. A curved shape with a larger curvature is formed, and a rear wall portion of the beam body is formed to be inclined rearward toward the outer side in the vehicle width direction. -Crash can front wall that covers the front of the crash can body and the crash can body that are in contact with the rear wall of the bumper beam from the front and project forward from the beam body at the front part of the left and right front side frames of the beam The rear end of the crash can body is joined to the rear wall of the bumper beam, and the front wall of the crash can forwards a part of the cover member of the bumper beam in front of the crash can body. It is characterized by being made to project.

  Crash can front wall that covers the front of the crash can body and the crash can body that are in contact with the rear wall of the bumper beam from the front and project forward from the beam body at the front part of the left and right front side frames of the bumper beam Since the left and right crush cans are provided, the same effects as in the first aspect can be obtained.

  According to a seventh aspect of the present invention, there is provided a front vehicle body structure in which the upper end and the lower end of the crash can front wall are bent rearward and joined to the upper and lower wall portions of the beam body. It is characterized by that.

  According to the first aspect of the present invention, a notch is formed in a state in which the front surface of the bumper beam is opened at the outer side in the vehicle width direction from the front side frame of the bumper beam, and a crush can is provided at the notch. Therefore, it is possible to provide a crash can protruding forward from the bumper beam by effectively utilizing the space in the bumper beam, and the collision energy absorption performance of the front vehicle body at the time of a collision from obliquely forward is improved. In addition, a bumper beam with a closed cross-section structure is used, and a crush can is formed by forming a notch on the outer side in the vehicle width direction from the front side frame of the bumper beam. However, it is possible to suppress a decrease in the rigidity of the bumper beam, and it is possible to ensure sufficient rigidity to transmit the collision load to the front side frame side.

  Further, the front wall of the crash can is configured so that the upper end extends above the upper edge of the notch portion of the bumper beam and the lower end extends below the lower edge of the notch portion of the bumper beam. It is possible to protect the bumper face provided in front of the bumper beam at the time of a collision from the outside, and to receive the collision load at this time widely and reliably by the crash can.

  According to the second aspect of the present invention, the left and right frame side crash cans are provided on the rear side of the bumper beam to connect the front ends of the left and right front side frames and the rear wall of the bumper beam. Thus, the collision load is reliably transmitted to the frame-side crash can, and the crash energy of the front vehicle body is further improved by the collapse of the frame-side crash can.

  According to the invention of claim 3, the bumper face provided in front of the bumper beam is formed in a curved shape so as to recede toward the side from the center in the vehicle width direction, and the notch is formed in the vehicle width direction. Since it was notched so as to incline backward toward the outside, the crush can of the appropriate shape protrudes more forward than the bumper beam, and the front wall of the crush can and the bumper face are faced almost in parallel. Thus, the bumper face can be prevented from being damaged at the time of a collision from an oblique front.

  According to the invention of claim 4, since the upper end portion and the lower end portion of the crash can front wall are respectively bent rearward and joined to the upper wall portion and the lower wall portion of the bumper beam, the crash can front wall is It is formed in an enlarged shape in the direction, and is securely joined to the upper wall portion and the lower wall portion, so that the crash can can be prevented from falling during a collision and the crash can can be reliably compressed and deformed. Moreover, since the closed cross section is maintained also about the site | part in which the notch part was formed in a bumper beam, the rigidity of a bumper beam can be ensured.

  According to the invention of claim 5, the crash can body includes at least a left vertical wall and a right vertical wall, and the left and right side edges of the crash can front wall are more lateral than the left vertical wall and the right vertical wall of the crash can. The left and right end portions of the front wall of the crash can are joined to the front end of the left vertical wall and the front end of the right vertical wall, respectively. It is possible to expand in the direction, and it is possible to receive the collision load acting at the time of the front collision as a whole in a wide area.

  According to the invention of claim 6, in the front side portions of the left and right front side frames of the bumper beam, the crush cans are provided in contact with the rear wall of the bumper beam from the front, respectively. A space can can be used effectively to provide a crash can that protrudes forward from the bumper beam, and the collision energy absorption performance of the front vehicle body at the time of a collision from an oblique front is improved. In addition, a bumper beam having a closed cross-sectional shape is used, and a crash can main body that protrudes forward from the beam body by contacting the rear wall of the bumper beam from the front at the front side portion of the left and right front side frames of the bumper beam. Since the crash can composed of the front wall of the crash can covering the front surface of the crash can is arranged, the rigidity of the bumper beam can be prevented from being lowered while ensuring the function of the crash can. It is possible to ensure sufficient rigidity to transmit the collision load acting at the time of the collision to the front side frame side. Furthermore, the front wall of the crash can and the bumper face can be faced substantially in parallel to make it difficult for the bumper face to be damaged during a collision from an oblique front.

  In addition, the rear end of the crash can body is joined to the rear wall of the bumper beam, and the front wall of the crash can is constructed by projecting a part of the bumper beam cover member in front of it, increasing the number of parts. It is possible to construct the front wall of the crash can without making it.

  According to the invention of claim 7, since the upper end portion and the lower end portion of the front wall of the crash can are bent rearward and joined to the upper wall portion and the lower wall portion of the beam body, the crash can collapses at the time of collision. It is possible to prevent the deformation and to reliably compress and deform the crash can. Moreover, since the closed cross section is maintained also about the site | part where the crash can was provided in the bumper beam, the rigidity of the bumper beam can be ensured.

  The front body structure of the automobile according to the present invention includes a notch portion formed in a state in which the front surface of the bumper beam is opened at the outer side in the vehicle width direction from the front side frame of the bumper beam, and the rear wall of the bumper beam. The front and rear walls of the crash can include a crash can body that protrudes forward from the bumper beam through the notch, and the crash can front wall that covers the front of the crash can body. Is configured such that the upper end extends above the upper edge of the notch portion of the bumper beam and the lower end extends below the lower edge of the notch portion of the bumper beam.

  According to another vehicle front body structure of the present invention, a bumper beam portion corresponding to the outer side in the vehicle width direction than the left and right front side frames is formed in a curved shape having a larger curvature than the bumper face, and the rear wall of the beam body The part is formed so as to incline backward as it goes outward in the vehicle width direction, and at the front side part of the left and right front side frames of the bumper beam, it is in contact with the rear wall of the bumper beam from the front and forward of the beam body. The left and right crash cans consist of a crash can main body protruding to the front and the crash can front wall covering the front of the crash can main body. The rear end of the crash can main body is joined to the rear wall of the bumper beam, and the front of the crash can The wall is constructed by projecting a part of the front bumper beam cover member forward. .

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1 and FIG. 2, a front bumper 1 is provided at the front of the automobile C along a curved surface that continues to the front end of the bonnet hood 2 and the front ends of the left and right front fenders 3. A front nose portion of the automobile C is constituted by the front end portion and the front end portions of the left and right front fenders 3. The front bumper 1 includes a bumper face 4, an impact absorber 5, a bumper beam 18, and the like.

Next, the front body structure of the automobile C will be described.
As shown in FIGS. 1 to 3, the front body structure includes left and right front side frames 6 extending in the front-rear direction, and left and right first crash cans (frame side crashes) fixed to the front ends of the front side frames 6, respectively. 8), the left and right front side frames 6 and the rectangular shrouds 10 made of synthetic resin supported and fixed to the left and right first crush cans 8 and the front end portions of the left and right front side frames 6 are bridged. The bumper beam 18, the left and right second crash cans 20 projecting forward from the bumper beam 18, the shock absorber 5 made of foamed resin, the bumper face 4 made of synthetic resin, and the like are provided.

  The first crush can 8 is formed in a rectangular tube shape with a steel plate so that the plate thickness is 1.5 mm and a load resistance of about 60 kg, and is compressed and deformed by a collision load applied from the front via the bumper beam 18 at the time of a vehicle collision. It is constructed in a size and shape that can absorb the collision energy by being crushed and achieve the desired energy absorption function. The first crush can 8 is provided between the front end of the front side frame 6 and the bumper beam 18, and the rear end portion thereof is coupled to the flange member 7 fixed to the front end portion of the front side frame 6. The bumper beam 18 is coupled to the rear wall 18a.

  As shown in FIGS. 3 to 5, the flange member 7 includes a first plate-like first connecting portion 7 a projecting vertically and horizontally with respect to the rear end portion of the first crash can 8, and a front side from the first connecting portion 7 a. And the second connecting portion 7b bent inward in the vehicle width direction, the rear end portion of the first crash can 8 is joined to the front surface of the first connecting portion 7a, and the rear surface of the first connecting portion 7a The flange 6a of the front side frame 6 is fastened. Three concave crushing promotion beads 8 a are formed at four corners of the outer peripheral surface of the first crush can 8, respectively. Thereby, when a collision load is transmitted from the bumper beam 18 to the first crash can 8, the first crash can 8 is easily crushed.

  The shroud 10 is integrally formed in a rectangular frame shape by a pair of upper and lower shroud door uppers 11 and shroud drawers 12 and a pair of left and right shroud sides 13, and is composed of a substantially rectangular radiator (not shown) and a condenser (not shown). It is configured so that it can be held around the entire circumference. A pair of left and right diagonal members 14 for connecting the central portion of the shroud upper 11 and the upper portion of the shroud side 13 are provided. A second connecting portion 7 b of the flange member 7 is fixed to the shroud side 13 with a bolt 15, and the shroud 10 is connected to the front side frame 6 and the first crash can 8. A connecting stay 16 is disposed substantially vertically at the center of the shroud upper 11, the upper end of the connecting stay 16 is fixed to the center of the shroud upper 11, and the lower end of the connecting stay 16 is the center of the bumper beam 18. It is fixed to the part.

  As shown in FIGS. 4 and 5, the bumper beam 18 has a closed cross-sectional structure that extends in the left-right direction with a high-tensile steel plate so as to have a plate thickness of 1.5 mm and a load resistance of about 130 kg. Cutout portions 19 that open the front surface of the bumper beam 18 are formed at both left and right ends of the bumper beam 18 (outside in the vehicle width direction from the front side frame 6), and these cutout portions 19 are formed outward in the vehicle width direction. The second crush cans 20 are provided so as to protrude backward from the bumper beam 18 through the notch 19 at positions corresponding to the notch 19 in the bumper beam 18. The second crash can 20 is in contact with the rear wall 18a of the bumper beam 18 from the front.

Next, the second crash can 20 will be described.
As shown in FIGS. 4 to 7, the bumper beam 18 is provided with left and right second crash cans 20 at positions corresponding to the front of the left and right first crash cans 8. Since the can 20 has almost the same configuration, the second crush can 20 on the left side will be described as an example.
The second crush can 20 is made of a steel plate with a plate thickness of 1.2 mm and a load resistance of about 60 kg, and is compressed and deformed by a collision load applied via the bumper face 4 at the time of collision from an oblique front. It is constructed in a size and shape that can absorb the collision energy and achieve the desired energy absorption function. The second crush can 20 is arranged in series with a bumper beam 18 in front of the first crush can 8 and is transmitted from the bumper beam 18 through the second crush can 20 at the time of a collision from an oblique front. Due to the collision load, the first crash can 8 is reliably crushed without falling down and deforming.

  The second crush can 20 includes a main body 21 and a cover 25 that covers the front surface of the main body 21, and the front end portion of the main body 21 and the cover 25 protrude forward from the bumper beam 18. The main body 21 has a rear wall 22, a left vertical wall 23, and a right vertical wall 24, and the length of the right vertical wall 24 in the front-rear direction is longer than that of the left vertical wall 23. A left flange 23a is formed at the front end of the left vertical wall 23 so as to project to the left, and a right flange 24a is formed at the front end of the right vertical wall 24 so as to project to the right. A bulging portion 18d projecting forward is provided at the middle portion of the rear wall 18a of the bumper beam 18, and the rear wall 22 of the main body portion 21 is joined to the front surface of the bulging portion 18d of the bumper beam 18, The main body 21 is fixed to the bumper beam 18.

  The cover portion 25 is configured in an enlarged shape so as to cover the notch portion 19 of the bumper beam 18 from the front side, and the left and right side ends of the cover portion 25 are more left and right than the left vertical wall 23 and the right vertical wall 24 of the main body portion 21. Each extends in the direction. An upper end flange portion 27 is formed at the upper end portion of the cover portion 25 and extends upward from the upper edge of the notch portion 19 and is bent rearward. The lower end portion of the cover portion 25 has the notch portion 19 with a lower end portion. A lower end flange portion 28 extending downward from the lower edge and bent rearward is formed. The cover portion 25 is disposed on the front side of the main body portion 21 to form the front wall of the second crash can 20, and the left end vicinity portion and the right end vicinity portion of the cover portion 25 are connected to the left flange portion 23 a of the main body portion 21. The upper flange portion 27 and the lower end flange portion 28 of the cover portion 25 are joined to the upper wall portion 18b and the lower wall portion 18c of the bumper beam 18, respectively. A circular hole 26 is provided in the front wall of the cover portion 25 for weight reduction.

  As shown in FIG. 7, the bumper face 4 is provided in front of the bumper beam 18 and the shock absorber 5, and is formed in a curved shape so as to recede toward the rear from the center in the vehicle width direction. The radius of curvature R2 of the bumper face 4 is configured to be smaller than the radius of curvature R1 of the bumper beam 18. The cover portion 25 of the second crash can 20 is disposed so as to face the bumper face 4 substantially in parallel.

Next, functions and effects of the front body structure of the automobile will be described.
A notch 19 is formed in the both ends of the bumper beam 18 so that the front surface of the bumper beam 18 is open, and the second crush can 20 is provided in the notch 19. The face 4 collides with the second crush can 20 and the second crush can 20 is compressed and deformed to be crushed to absorb the collision energy, and the collision load is transmitted to the first crush can 8 via the bumper beam 18. . The first crash can 8 is compressed and deformed by the transmitted collision load to absorb the collision energy. In a more severe collision, the front side frame 6 is also compressed and deformed to absorb the collision energy. Thereby, at the time of the collision from diagonally forward, the absorption performance of the collision energy of the front vehicle body can be improved.

  Since the second crush can 20 is provided in the notch portion 19 of the bumper beam 18, the second crush can 20 protruding forward from the bumper beam 18 by effectively utilizing the space in the bumper beam 18 can be provided. In addition, the bumper beam 18 having a closed cross-section structure is effectively used, and the second crash can 20 is provided by forming the notch portions 19 at both ends of the bumper beam 18, so that the function of the second crash can 20 is secured. However, it is possible to ensure sufficient rigidity to transmit the collision load to the front side frame 6 side. Further, in the cover portion 25 of the second crash can 20, the upper end thereof extends above the upper edge of the notch portion 19 of the bumper beam 18, and the lower end thereof extends below the lower edge of the notch portion 19. Therefore, the collision load can be received widely and reliably by the second crash can 20 at the time of collision from obliquely forward.

  Since the left and right first crash cans 8 connecting the front ends of the left and right front side frames 6 and the rear walls of the bumper beam 18 are provided on the rear side of the bumper beam 18, the first crash occurs via the bumper beam 18 at the time of a front collision. The collision load is reliably transmitted to the can 8, and the crash energy of the first crash can 8 further improves the collision energy absorption performance of the front vehicle body. The bumper face 4 is formed in a curved shape so as to recede toward the rear from the center in the vehicle width direction, and the notch 19 of the bumper beam 18 inclines backward as it goes outward in the vehicle width direction. Since the second crush can 20 having an appropriate shape is projected forward from the bumper beam 18 with the cutout, the cover portion 25 of the second crush can 20 and the bumper face 4 face each other substantially in parallel. The bumper face 4 can be made difficult to be damaged at the time of a collision from an oblique front.

  An upper end flange portion 27 and a lower end flange portion 28 are formed by bending the upper end portion and the lower end portion of the cover portion 25 of the second crash can 20 to the rear, and the upper end flange portion 27 and the lower end flange portion 28 are notched. Since the bumper beam 18 is joined to the upper wall portion 18b and the lower wall portion 18c at a position corresponding to the portion 19, the cover portion 25 of the second crush can 20 is formed in an enlarged shape in the vehicle width direction to form the upper wall portion. The second crush can 20 can be reliably crushed by reliably joining to the lower wall portion 18c and preventing the second crush can 20 from falling down during a collision. Moreover, since the closed cross section is maintained also about the site | part in which the notch part 19 was formed in the bumper beam 18, the rigidity of the bumper beam 18 can be ensured.

  The left and right side ends of the cover portion 25 of the second crash can 20 are configured to extend in the left and right directions from the left vertical wall 23 and the right vertical wall 24 of the second crash can 20, respectively. Since the left end vicinity part and the right end vicinity part of 25 are joined to the left flange part 23a and the right flange part 24a of the second crush can 20, respectively, the receiving surface of the second crush can 20 can be expanded in the left-right direction, The impact load acting at the time of the front impact can be received as a whole in a wide area.

Next, a second embodiment of the present invention will be described with reference to FIGS. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described.
In the second embodiment, a base plate (which corresponds to the beam body) 30 having a U-shaped cross section and a closing plate (which corresponds to a cover member) 32 covering the front surface of the base plate 30 have a closed cross section. This is an example in which the second crush cans 20A are respectively provided on the front side portions of the left and right front side frames 6 in the configured bumper beam 18A.

  As shown in FIG. 9, the radius of curvature R3 of the bumper beam 18A corresponding to the outer side in the vehicle width direction from the left and right front side frames 6 is formed in a curved shape larger than the radius of curvature R4 of the bumper face 4. The second crash can 20A is provided in front of the left and right front side frames 6, that is, in front of the first crash can 8A so as to protrude forward from the base plate 30.

  As shown in FIGS. 8 and 9, the bumper beam 18A has a base plate 30 and a closing plate 32. The base plate 30 has a plate thickness of 1.5 mm and a high tension so as to have a load resistance of about 130 kg. It is formed of a steel plate and is formed in a U-shaped cross section having a rear wall 30a, an upper wall 30b, and a lower wall 30c so that the front is open. An upper end flange portion 30d projecting upward is formed at the front end portion of the upper wall 30b, and a lower end flange portion 30e projecting downward is formed at the front end portion of the lower wall 30c, and the rear wall 30a extends in the vehicle width direction. It is formed to incline backward as it goes outward. At the position where the second crash can 20A is disposed, an upper plate portion 30f protruding forward is formed in the upper end flange portion 30d, and a lower plate portion 30g protruding forward is formed in the lower end flange portion 30e. .

  The closing plate 32 is made of a high-strength steel plate having a thickness smaller than that of the base plate 30 and having a low rigidity. The closing plate 32 projects forward from the bumper beam 18A at a position where the second crash can 20A is disposed on the closing plate 32. A cover portion 25A is provided integrally. The closing plate 32 is disposed on the front side of the base plate 30 to form the front wall of the bumper beam 18, and the upper end portion and the lower end portion thereof are joined to the upper end flange portion 30 d and the lower end flange portion 30 e of the base plate 30, respectively. ing.

  The second crush can 20A is configured by a main body portion 21A and a cover portion 25A of a closing plate 32 that covers the front surface of the main body portion 21A, and the closing plate 32 is disposed on the front side of the base plate 30 and the main body portion 30. A cover portion 25A is provided so as to be located on the front side of the first and second cover portions 20A constitute the front wall of the second crash can 20A. The main body 21 </ b> A has a rear wall 40, a left vertical wall 41, and a right vertical wall 42, and a left flange portion 41 a that protrudes to the left is formed at the front end of the left vertical wall 41. Is formed with a right flange portion 42a extending to the right side. The main body 21 </ b> A is fixed to the base plate 30 by joining the rear wall 40 of the main body 21 </ b> A to the front surface of the rear wall 30 a of the base plate 30.

  The cover plate 25 </ b> A of the closing plate 32 includes a front plate portion 33 that constitutes a front wall of the second crash can 20 </ b> A, an upper plate portion 34 in which an upper end portion of the front plate 33 is bent rearward, and a front plate portion 33. The lower plate portion 35 has a lower end bent backward, a left plate portion 36, and a right plate portion 37. The lower surface of the upper plate portion 34 is joined to the upper surface of the upper plate portion 30f by bead welding. The upper surface of the lower plate portion 35 is joined to the lower surface of the lower plate portion 30g by bead welding, and the vicinity of the left end and the vicinity of the right end of the cover portion 25A are joined to the left flange portion 41a and the right flange portion 42a of the main body portion 21A, respectively. Has been.

  In this case, the rear end of the second crash can 20A is joined to the rear wall 30a of the bumper beam 18A, and the front wall of the second crash can 20A is configured by protruding a part of the closing plate 32 of the bumper beam 18A forward. Thus, the front wall of the second crash can 20A can be configured without increasing the number of parts. The upper plate portion 34 of the cover portion 25A of the closing plate 32 is joined to the upper plate portion 30f of the upper wall 30b of the base plate 30, and the lower plate portion 35 of the cover portion 25A is the lower plate portion 30g of the lower wall 30c of the base plate 30. Therefore, it is possible to prevent the second crash can 20A from collapsing and prevent the second crash can 20A from being crushed. Moreover, since the closed cross section is maintained also about the site | part in which the 2nd crush can 20A was provided in bumper beam 18A, the rigidity of bumper beam 18A can be ensured.

Next, a modified example in which the above embodiment is partially modified will be described.
1] In the above embodiment, as shown in FIG. 10, the upper wall 50 and the lower wall 51 connected to the rear wall 22, the left vertical wall 23, and the right vertical wall 24 are provided on the main body 21 of the second crash can 20. May be. Similarly, an upper wall and a lower wall connected to the rear wall 40, the left vertical wall 41, and the right vertical wall 42 may be provided on the main body portion 21A of the second crash can 20A.

  2] In the above embodiment, the first and second crash cans 8 and 20 may be integrally provided by joining the rear end portion of the second crash can 20 to the front end portion of the first crash can 8 in a penetrating manner. Good. Similarly, the first and second crash cans 8A and 20A may be integrally provided by joining the rear end portion of the second crash can 20A in a penetrating manner to the front end portion of the first crash can 8A. In this case, the crash cans can be reliably compressed and deformed by further preventing the second crash cans 20 and 20A from falling over at the time of collision.

3] In the second embodiment, the cover portion 25A that is the front wall of the second crush can 20A is configured separately from the closing plate 32, and the cover portion 25A is the main body portion of the second crush can 20A as in the first embodiment. 21A and the base plate 30 may be joined.
4) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. .

1 is a perspective view of an automobile according to Embodiment 1 of the present invention. It is a front view of a motor vehicle. It is a principal part perspective view of the front vehicle body structure of a motor vehicle. FIG. 4 is an enlarged perspective view of a bumper beam and first and second crash cans (in a state where a cover portion is not attached). It is an expansion perspective view, such as a bumper beam and the 1st, 2nd crush can (state which attached the cover part). It is a longitudinal cross-sectional view of a bumper beam, the 1st, 2nd crush can, and a front side frame. It is a cross-sectional view of a bumper beam, first and second crash cans, a front side frame, and the like. It is a principal part exploded view of the bumper beam which concerns on Example 2, and a 1st, 2nd crash can. FIG. 9 is a cross-sectional view of the bumper beam and first and second crash cans of FIG. 8. FIG. 5 is a diagram corresponding to FIG.

Explanation of symbols

C automobile 4 bumper face 6 front side frame 8 first crash cans 18 and 18A bumper beam 19 notch portions 20 and 20A second crash cans 21 and 21A main body portion 23 left vertical wall 24 right vertical wall 25 cover portion 30 base plate 32 Closing plate

Claims (7)

In the front body structure of an automobile having left and right front side frames and a bumper beam having a closed cross-sectional structure bridged across the front end portions of the left and right front side frames,
A notch formed in a state where the front surface of the bumper beam is opened to the outer side in the vehicle width direction from the front side frame of the bumper beam;
The left and right crashes comprising a crash can body that abuts against the rear wall of the bumper beam from the front and projects forward from the bumper beam through the notch and the front wall of the crash can that covers the front of the crash can body With kang,
The crash can front wall is configured such that an upper end thereof extends upward from an upper edge of the notch portion of the bumper beam and a lower end thereof extends downward from a lower edge of the notch portion of the bumper beam. The front body structure of the car.   2. The front body of the automobile according to claim 1, wherein left and right frame side crash cans are provided on the rear side of the bumper beam to connect the front ends of the left and right front side frames and the rear wall of the bumper beam. Construction. The bumper face provided in front of the bumper beam is formed in a curved shape so as to recede toward the rear from the center in the vehicle width direction.
3. The front body structure of an automobile according to claim 1, wherein the notched portion is notched so as to incline backward toward the outside in the vehicle width direction.   The automobile according to any one of claims 1 to 3, wherein an upper end portion and a lower end portion of the front wall of the crash can are bent rearward and joined to an upper wall portion and a lower wall portion of a bumper beam. Front car body structure. The crash can body includes at least a left vertical wall and a right vertical wall,
The left and right side edges of the front wall of the crash can are configured to extend in the left and right directions from the left and right vertical walls of the crash can, respectively, and the left and right end portions of the front wall of the crash can The front body structure of an automobile according to claim 4, wherein the front body structure is joined to a front end of the left vertical wall and a front end of the right vertical wall. A cross-sectionally U-shaped beam body having left and right front side frames, a rear wall, an upper wall, and a lower wall, and a cover member that covers the front surface of the beam body and has a lower rigidity than the beam body. The bumper beam is bridged across the front ends of the left and right front side frames, and is formed in a curved shape that is disposed on the front side of the bumper beam and recedes backward from the center toward the outside in the vehicle width direction. In the front body structure of a car with a bumper face
The bumper beam portion corresponding to the outer side in the vehicle width direction than the left and right front side frames is formed in a curved shape having a larger curvature than the bumper face, and the rear wall portion of the beam body is rearward as it goes outward in the vehicle width direction. Formed to incline,
A crash can body that is in contact with the rear wall of the bumper beam from the front and protrudes forward from the beam body and a front surface of the crash can body at the front side portions of the left and right front side frames of the bumper beam. With left and right crash cans composed of front walls,
A rear end of the crash can main body is joined to a rear wall of a bumper beam, and the front wall of the crash can is configured by projecting a part of a cover member of the bumper beam in front thereof. Front car body structure of an automobile.   7. The front body structure of an automobile according to claim 6, wherein an upper end portion and a lower end portion of the crash can front wall are bent rearward and joined to an upper wall portion and a lower wall portion of the beam body. .

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