JP2012061900A - Front side vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve supporting rigidity of a damper supported by a damper section and to stabilize fracture mode control of a front side frame.SOLUTION: A front side vehicle body structure is provided, including a dashboard 14 partitioning an engine room 13 from a cabin 12, a pair of font side frames 16 bonded to the dashboard 14 at the rear ends and extending toward the front side, and a damper section 33 placed on and connected to the front side frame 16 at the lower portion. The front side frame 16 includes an easily-deformable portion 75 formed within a range of the front side frame which the damper section 33 is placed on and connected to, and having a lower yield strength against rearward and forward input loads than remaining regions of the front side frame 16. The damper section 33 has a vertical bead 76 projecting in a vehicle width direction and vertically extending. The easily-deformable portion 75 and the vertical bead 76 are disposed in the same position in a front-rear direction of the vehicle body.

Description

  The present invention relates to a dashboard that partitions an engine room and a cabin, a pair of left and right front side frames that are connected to the dashboard and extending forward, and a damper portion (damper housing) whose bottom is grounded to the front side frame And a vehicle body front portion structure.

  The vehicle body front structure includes a dashboard cross member connected to the lower portion of the dashboard lower that forms the front wall of the passenger compartment, a front side frame that extends from the dashboard cross member to the front of the vehicle and is arranged on the left and right sides of the engine room, A damper housing (damper portion) attached to the front side frame.

  The damper housing (damper part) includes a partition wall (bulk head) that is connected to the front wall part facing forward of the vehicle and partitions the front side frame. The front side frame is formed with a front deformed portion provided in front of the bulkhead, an inner weakness provided in the inner wall portion behind the bulkhead, and a concave shape in the outer wall portion behind the damper housing in the vehicle. It is equipped with outside vulnerability.

  According to this vehicle body front part structure, most of the front collision energy can be absorbed by deformation of the front side frame. Thereby, the deformation | transformation mode of the front side frame at the time of a front collision can be stabilized (for example, refer patent document 1).

JP 2009-255883 A

In recent years, there is a tendency of short overhang that shortens the front and rear length of the engine room in order to expand the cabin area. Shortening the front and rear length of the engine room reduces the absorption region of the front impact load, and more efficient front impact energy absorption performance is required.
In the vehicle body front part structure of Patent Document 1, since most of the front collision energy is absorbed by deformation of the front side frame, the front collision energy absorption performance depends on the rigidity of the front side frame. Therefore, it is not possible to absorb the front collision energy more efficiently using other parts.

Further, in order to stabilize the deformation mode of the front side frame, the installation portion of the damper housing (damper portion) on the front side frame has a bifurcated leg shape having an opening. That is, the damper support rigidity of the damper housing can be lowered.
Further, it is considered that the front side frame is weakened and the shock absorbing performance is reduced by the amount of the weak part provided in the front side frame.

  An object of the present invention is to provide a vehicle body front structure that can improve the support rigidity of a damper supported by a damper housing (damper part) and can increase the amount of shock absorption. It is another object of the present invention to provide a vehicle body front structure that can stabilize the mode control of the folding of the front side frame.

The invention according to claim 1 includes a dashboard that partitions the engine room and the cabin, a pair of left and right front side frames that are coupled to the dashboard and extending rearward, and a damper portion that is grounded to the front side frame. The front side frame has an easily deformable portion whose proof strength against front and rear inputs is lower than that of other parts of the front side frame within a range in which the damper portion contacts the ground. The damper part includes a vertical bead that protrudes in a convex shape in the vehicle width direction and extends in the vertical direction, and the easily deformable part and the vertical bead are arranged at the same position in the longitudinal direction of the vehicle body.
The damper portion is composed of a damper base to which a damper (damper unit) is attached, and a damper housing formed around the damper base.

  In the invention according to claim 2, the front side frame is provided with a horizontal bead extending in the longitudinal direction, and the easily deformable portion is set in front of the front end portion of the horizontal bead or rearward of the rear end portion of the horizontal bead. It is characterized by.

  In the invention according to claim 3, the vertical bead includes a front ridge line and a rear ridge line, and a width between the front ridge line and the rear ridge line is directed to a lower portion coupled to the front side frame. It is characterized in that it is formed in a divergent shape so that it gradually spreads along with.

  The invention according to claim 4 is characterized in that the vertical bead is formed so that the front ridge line extends toward the easily deformable portion and the rear ridge line extends toward the coupling portion between the front side frame and the dashboard. And

  The invention according to claim 5 is characterized in that the joint between the front side frame and the dashboard is provided with a reinforcing bracket for reinforcing the joint.

The present invention has the following effects.
In the invention according to claim 1, a dashboard that partitions the engine room and the cabin, a pair of left and right front side frames that are coupled to the dashboard and extending to the front side, and a damper portion that is grounded to the lower side of the front side frame And provided.
The front side frame includes an easily deformable portion in which the proof strength with respect to front and rear inputs (loads) is lower than that of other portions of the front side frame within a range in which the damper portion contacts the ground. The damper portion includes a vertical bead that protrudes in a convex shape in the vehicle width direction and extends in the vertical direction.
Since the easily deformable portion and the vertical bead are arranged at the same position in the longitudinal direction of the vehicle body, the vertical bead becomes a beam extending vertically with respect to the vertical input (load) of the damper. Thereby, the support rigidity of the damper supported by a damper part can be improved.
In addition, since the easily deformable portion and the vertical bead serve as the starting point of bending with respect to the front / rear input of the front impact load, for example, the damper portion formed of a thick plate can be used for shock absorption, and the amount of shock absorption can be reduced. Increase can be achieved. Further, the easily deformable portion and the vertical bead are arranged at the same position in the longitudinal direction of the vehicle body. That is, it can be considered that the starting points of the folding of the front side frame and the damper portion are arranged at the same position in the front-rear direction. As a result, it is possible to stabilize the mode control of the folding of the front side frame.

  In the invention according to claim 2, the front side frame is provided with a horizontal bead extending along the longitudinal direction, and the easily deformable portion is set in front of the front end portion of the horizontal bead or rearward of the rear end portion of the horizontal bead. The lateral bead can improve the yield strength of the front side frame with respect to the front-rear input (load), and the easily deformable portion can be formed with a simple configuration. In addition, since the mode can be controlled without providing a weak portion on the front side frame, the shock absorption performance by the front side frame is not deteriorated.

  In the invention according to claim 3, the vertical bead includes a front ridge line and a rear ridge line, and a width between the front ridge line and the rear ridge line is directed to a lower portion coupled to the front side frame. Therefore, the push-up input (load) from the damper supported by the damper portion can be supported in a wide range before and after the front side frame. As a result, the damper support rigidity can be improved.

  In the invention according to claim 4, the vertical bead is formed such that the front ridge line extends toward the easily deformable portion and the rear ridge line extends toward the coupling portion between the front side frame and the dashboard. The ridgeline is the starting point for the breakage of the damper part. As a result, the deformation mode of the front side frame can be stabilized and the support rigidity of the damper can be improved at the ridge line on the rear side.

  In the invention which concerns on Claim 5, since the bracket for reinforcement which reinforces a joint part is provided in the joint part of a front side frame and a dashboard, the improvement of the rigidity and intensity | strength of the joint part which a back ridgeline grounds is aimed at. Can do. As a result, the support rigidity of the damper is improved.

It is a top view which shows the vehicle body front part structure which concerns on this invention. It is a side view from the vehicle body inside of the vehicle body front part structure shown in FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a perspective view from the vehicle body inner upper part of the vehicle body front part structure shown by FIG. It is a perspective view which shows the principal part of the vehicle body front part structure shown by FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIGS. 1 to 5, a front bulkhead 31 formed in a rectangular shape in front view and a front side frame extending in the front-rear direction outside the vehicle width of the front bulkhead 31 are disposed at the front of the vehicle body 10. 16, an upper frame (upper member) 17 that is juxtaposed on the outside of the front side frame 16 and is curved upward toward the rear of the vehicle body, a dashboard 14 that partitions the engine room 13 and the cabin (vehicle compartment) 12; The lower part is grounded to the front side frame 16 and a damper part 33 that supports a damper unit (not shown), an inner shock absorbing member (inner bumper beam extension) 21 provided at the front end of the front side frame 16, An external shock absorber provided outside the bumper beam extension 21 and at the front end of the upper frame 17. A member (outer bumper beam extension) 22, a connection plate 23 to which the inner shock absorbing member 21 and the outer shock absorbing member 22 are connected in the vehicle width direction, and the inner shock absorbing member 21 and the outer shock absorbing member 22. And a bumper beam 24 provided at the front end.

  The vehicle body front part structure shown in FIG. 1 is a connection structure around the dashboard 14, the front side frame 16 and the damper part 33. Details will be described below.

A pair of the front side frame 16, the upper frame 17, the inner shock absorbing member 21, the outer shock absorbing member 22, the connecting plate 23, and the damper portion 33 are provided symmetrically with respect to the vehicle width direction.
The damper portion 33 includes a damper base 55 to which a damper (damper unit) (not shown) is attached, and a damper housing 56 formed around the damper base 55. FIG. 1 shows the right side of the vehicle body 10.

  The front side frame 16 and the front end 17a of the upper frame 17 are joined to be flush with the front end 16a. That is, the front side frame 16 has a flange 53 on the front side frame 16 side at the front end portion 16a of the front side frame 16, and the flange 54 of the upper frame 17 is provided at the front end portion 17a of the upper frame 17, and the flanges 53, 54 are continuous and flush with each other. It is provided to become.

The flange 53 on the side of the front side frame 16 extends to the inside of the vehicle width, and wraps in the vehicle width direction with the closed cross section of the side stay 47 constituting the left and right of the front bulkhead 31 in the vehicle body front-rear direction. Reference numeral 53 a is an overlap portion that wraps around the side stay 47.
The front side frame 16 is formed in a closed cross-sectional shape.

  It can be said that the front side frame 16 is a member whose rear end is coupled to the dashboard 14 and extends forward. The connecting portion 71 between the front side frame 16 and the dashboard 14 includes a reinforcing bracket 72 that reinforces the connecting portion 71.

  The front side frame 16 has a resistance to front and rear inputs (loads) within a range where the lateral beads 73 and 73 extending along the longitudinal direction and the damper housing 56 of the damper portion 33 are grounded in the middle of the front side frame 16. An easy-to-deform portion 75 that is lower than other portions of the front side frame 16 is formed.

  Although the lateral beads 73 are shown inside the front side frame 16, they are also formed outside the front side frame 16 at the same position in the longitudinal direction of the vehicle body.

  The easily deformable portion 75 is set behind the rear end portion 73 b of the horizontal bead 73. The easily deformable portion 75 is formed with a broken line. In addition, it may be formed in a reduced cross section as compared with other portions, or may be formed with notches or notches. The easily deformable portion 75 serves as a starting point for bending of the damper portion 33 and the front side frame 16. The easily deformable portion 75 may be formed forward of the front end portion 73 a of the horizontal bead 73. S2 indicates a damper housing grounding range in which the damper housing 56 of the damper portion 33 is grounded to the front side frame 16.

  The inner shock absorbing member 21 is provided at the front end portion 16 a of the front side frame 16 and extends forward from the front bulkhead 31. Furthermore, the tip is curved and formed so as to be directed outwardly of the vehicle width. Thereby, when a front impact load acts on the bumper beam 24 obliquely from the outside of the vehicle width, the inner shock absorbing member 21 can be smoothly crushed and the absorption of the shock can be promoted.

  The outer shock absorbing member 22 is provided at the front end portion 17a of the upper frame 17 and extends linearly forward of the vehicle body. Thereby, when a front impact load acts on the bumper beam 24, the outer impact absorbing member 22 can be smoothly crushed and the absorption of the impact can be promoted.

  The connecting plate 23 is a member extended in the vehicle width direction, and is a member on which the inner shock absorbing member 21 and the outer shock absorbing member 22 are mounted integrally.

  The front bulkhead 31 is composed of an upper staple 45 and a lower stay (not shown) extending in the vehicle width direction, and a pair of left and right side stays 47 (see FIG. 1) extending in the vehicle body vertical direction.

The damper base 55 of the damper portion 33 is formed of a thick plate. Further, the damper housing 56 of the damper portion 33 is formed of a steel plate thinner than the damper base 55, and includes a vertical bead 76 that protrudes in a convex shape in the vehicle width direction and extends in the vertical direction.
The vertical bead 76 is disposed at the same position in the longitudinal direction of the vehicle body as the easily deformable portion 75 of the front side frame 16 and includes a front ridge line 76a and a rear ridge line 76b. Specifically, the front ridge line 76a of the vertical bead 76 is disposed at the same position as the easily deformable portion 75 of the front side frame 16 in the longitudinal direction of the vehicle body.

  The front ridge line 76 a extends toward the easily deformable portion 75, and the rear ridge line 76 b extends toward the coupling portion 71 between the front side frame 16 and the dashboard 14. The width between the front ridge line 76a and the rear ridge line 76b is formed in a divergent shape so as to gradually widen toward the lower part coupled to the front side frame 16.

  As shown in FIG. 5, the dashboard 14 includes a dash lower panel 37 that partitions the cabin (vehicle compartment) 12 and the engine room 13, and a dash upper panel 38 provided on the upper portion of the dash lower panel 37. .

  An easily deformable portion 75 is formed on the front side frame 16, and a vertical bead 76 convex in the vehicle width direction extending in the vertical direction is formed on the damper housing 56 of the damper portion 33, and the easily deformable portion 75 and the vertical bead 76 are The same position in the direction. The vertical bead 76 functions as a beam extending vertically for a vertical input (load) of a damper unit (not shown), improves the damper support rigidity, and is not bent for the longitudinal input of a front impact load. Acts as a starting point.

  The shock absorbing amount is increased by utilizing the thick damper base 55 for shock absorption. The vertical bead 76 is set at the same position as the easily deformable portion 75 that acts as a starting point for bending of the damper housing 56 and the front side frame 16, thereby stabilizing the mode control of the bending mode of the damper portion and the front side frame 16. Plan.

A lateral bead 73 extending in the front-rear direction was formed in the middle of the longitudinal direction of the front side frame 16, and the rear side of the rear end 73 b of the lateral bead 73 was set as the easily deformable portion 75.
The lateral bead 73 improves the proof strength of the front side frame 16 with respect to the longitudinal input (load). A difference was given to the proof strength of the front side frame 16 between the front portion of the lateral beads 73 and the vicinity of the rear end portions 73a and 73b, and this was defined as the easily deformable portion 75. The easily deformable portion 75 may be set in front of the front end portion 73 a of the horizontal bead 73.

  Moreover, the support rigidity of a damper is improved by making the vertical bead 76 by the side of the damper housing 56 of the damper part 33 into a divergent shape toward the downward part couple | bonded with the front side frame 16. FIG.

  The front ridge line 76 a of the vertical bead 76 is grounded in the vicinity of the rear end 73 b of the horizontal bead 73, and the rear ridge line 76 b is grounded to the connecting portion 71 between the front side frame 16 and the dashboard 14. Thereby, the deformation mode of the front side frame 16 is stabilized by the front ridge line 76a, and the support rigidity of the damper is improved by the rear ridge line 76b.

  By providing the reinforcing bracket 72 in the connecting portion 71 between the front side frame 16 and the dashboard 14, the rigidity and strength of the connecting portion 71 to which the rear ridge line 76 b is grounded are improved. Thereby, the damper support rigidity was improved.

  As shown in FIGS. 1 and 2, in the front structure of the vehicle body, a dashboard 14 that partitions the engine room 13 and the cabin 12, and a pair of left and right fronts that are coupled to the dashboard 14 at the rear end and extend forward. A side frame 16 and a damper portion 33 with a lower portion grounded to the front side frame 16 are provided.

  The front side frame 16 includes an easily deformable portion 75 in which the proof strength with respect to front and rear inputs (loads) is lower than that of other portions of the front side frame 16 within a range where the damper housing 56 of the damper portion 33 is grounded. The damper housing 56 includes a vertical bead 76 that protrudes in a convex shape in the vehicle width direction and extends in the vertical direction.

  Since the easily deformable portion 75 and the vertical bead 76 are arranged at the same position in the longitudinal direction of the vehicle body, the vertical bead 76 becomes a beam extending vertically with respect to the vertical input (load) of the damper. Thereby, the support rigidity of the damper supported by the damper part 33 can be improved.

  In addition, since the easily deformable portion 75 and the vertical bead 76 serve as a starting point of bending with respect to the front / rear input of the front impact load, for example, the damper base 55 of the damper portion 33 formed of a thick plate is also used for shock absorption. It can be used, and the amount of shock absorption can be increased. Furthermore, the easily deformable portion 75 and the vertical bead 76 are arranged at the same position in the vehicle longitudinal direction. That is, it can be considered that the starting points of the folding of the front side frame 16 and the damper portion 33 are arranged at the same position in the front-rear direction. As a result, it is possible to stabilize the folding mode control of the front side frame 16.

  As shown in FIG. 2, in the front body structure of the vehicle body, the front side frame 16 includes a horizontal bead 73 extending along the longitudinal direction, and the easily deformable portion 75 is provided behind the rear end 73 b of the horizontal bead 73. Therefore, the lateral beads 73 can improve the proof strength of the front side frame 16 with respect to the front and rear inputs (loads), and the easily deformable portion 75 can be formed with a simple configuration. Further, since the mode control can be performed without providing a weak portion on the front side frame 16, the shock absorbing performance by the front side frame 16 is not deteriorated.

  As shown in FIG. 2, in the vehicle body front part structure, the vertical bead 76 includes a front ridge line 76 a and a rear ridge line 76 b, and the width between the front ridge line 76 a and the rear ridge line 76 b is small. Since it is formed in a divergent shape so that it gradually spreads toward the lower part coupled to the front side frame 16, the thrust input (load) from the damper supported by the damper portion 33 is applied to the front side frame 16. Can support a wide range of front and rear. As a result, the damper support rigidity can be improved.

  As shown in FIG. 5, in the vehicle body front structure, the vertical bead 76 has a front ridge line 76 a extending toward the easily deformable portion 75, and a rear ridge line 76 b is formed between the front side frame 16 and the dashboard 14. Since it is formed so as to extend toward the coupling portion 71, the ridge line 76 a on the front side becomes a starting point for bending of the damper portion 33. Thereby, the deformation mode of the front side frame 16 can be stabilized, and the support rigidity of the damper can be improved by the rear ridge line 76b.

  As shown in FIG. 5, in the vehicle body front structure, the connecting portion 71 between the front side frame 16 and the dashboard 14 is provided with a reinforcing bracket 72 that reinforces the connecting portion 71, so that the rear ridgeline 76 b is The rigidity and strength of the connecting portion 71 to be grounded can be improved. As a result, the support rigidity of the damper is improved.

  In the vehicle body front structure according to the present invention, as shown in FIG. 2, the easily deformable portion 75 is set behind the rear end portion 73 b of the lateral bead 73. The portion 75 may be formed forward of the front end portion 73 a of the horizontal bead 73.

  The present invention includes a vehicle body front structure in which an engine room and a cabin are partitioned by a dashboard, a pair of left and right front side frames are coupled to the dashboard, and a lower portion of a damper portion (damper housing) is grounded to the front side frame. Suitable for application to automobiles.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body, 12 ... Cabin, 13 ... Engine room, 14 ... Dashboard, 16 ... Front side frame, 33 ... Damper part, 71 ... Joint part, 72 ... Reinforcing bracket, 73 ... Side bead, 73a ... Front end part 73b ... rear end part, 75 ... easily deformable part, 76 ... vertical bead, 76a ... ridge line on the front side, 76b ... ridge line on the rear side.

Claims (5)

A vehicle body comprising a dashboard that partitions the engine room and the cabin, a pair of left and right front side frames that are coupled to the dashboard and having a rear end coupled to the front side, and a damper portion that has a lower portion grounded to the front side frame A front structure,
The front side frame includes an easily deformable portion in which the resistance to front and rear inputs is reduced compared to other portions of the front side frame within a range in which the damper portion contacts the ground.
The damper portion includes a vertical bead that protrudes in a convex shape in the vehicle width direction and extends in the vertical direction,
The vehicle body front structure, wherein the easily deformable portion and the vertical bead are arranged at the same position in the vehicle longitudinal direction. The front side frame includes a lateral bead extending along a longitudinal direction,
The vehicle body front part structure according to claim 1, wherein the easily deformable part is set forward of a front end part of the horizontal bead or rearward of a rear end part of the horizontal bead. The vertical bead includes a ridge line on the front side and a ridge line on the rear side,
The width between the front ridge line and the rear ridge line is formed in a divergent shape so as to gradually widen toward a lower portion coupled to the front side frame. Or the vehicle body front part structure of Claim 2.   The vertical bead is formed such that the front ridge line extends toward the deformable portion, and the rear ridge line extends toward a coupling portion between the front side frame and the dashboard. The vehicle body front part structure according to claim 3.   The vehicle body front part structure according to claim 4, wherein a joint portion between the front side frame and the dashboard includes a reinforcing bracket that reinforces the joint portion.

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