JP2016078474A - Vehicle front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle front part structure which can make compatible the securement of the support rigidity of a suspension member and the securement of a crush margin of a front side member at the input of a collision load from a vehicle front side by a simple constitution.SOLUTION: A flange part 26B of a brace 26 is extended to a peripheral edge 26A3 of a brace main body part at one side with respect to a center line along an extension direction of the brace main body part 26A out of the peripheral edge except for an end 26A1 and an end 26A2 of the brace main body part 26A. The flange part 26B is arranged by being bent to a lower side of a vehicle with respect to the brace main body part 26A. Therefore, the rigidity of the brace 26 against the displacement of the suspension member 20 in a vehicle vertical direction can be secured. Since a bead part 26C is formed over the brace main body part 26A and the flange part 26B, when a collision load is inputted to the suspension member 20, the brace 26 is displaced with the bead part 26C as a starting point of the deformation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle front structure.

  The following Patent Document 1 discloses an invention related to a front body structure of a vehicle. In this vehicle front body structure, the suspension member and the front side member are connected by a brace, and a flange portion is formed along the outer periphery of the brace. For this reason, it is possible to ensure the rigidity of the brace against the displacement of the suspension member in the vertical direction of the vehicle, and as a result, it is possible to stably support the suspension member when the vehicle is traveling. Further, the vehicle front body structure of the vehicle includes a disengagement permitting means, and when the collision load is input from the front side of the vehicle, the connection state between the suspension member and the front side member is released, and the suspension member It moves relative to the vehicle body toward the rear of the vehicle. As a result, it is possible to secure a collapse allowance for the front side member when a collision load is input from the front side of the vehicle.

JP 2009-298363 A

  However, in the case of the prior art described in Patent Document 1, the detachment permitting means includes a front hole provided in the fastening bracket and a rear hole provided in the suspension mounting member. Therefore, it is necessary to configure the detachment permitting means with a plurality of members, and the configuration of the vehicle body becomes complicated.

  In consideration of the above facts, the present invention provides a vehicle front portion that can achieve both the support rigidity of the suspension member and the securing of the crushing margin of the front side member when a collision load is input from the front side of the vehicle with a simple configuration. The purpose is to obtain a structure.

  The vehicle front structure according to the first aspect of the present invention is arranged with the vehicle vertical direction as the plate thickness direction and extends from the vehicle front side to the vehicle rear side, and the vehicle rear side of the suspension member and the front side member Of the brace body part constituting the main part of the brace connecting the rear side of the vehicle and the peripheral part of the brace body part excluding both ends in the extending direction of the brace body part. A flange portion that extends to one side or the other side with respect to the center line along the direction and is bent toward the vehicle upper side or the vehicle lower side with respect to the brace body portion; and the brace body portion; The brace part is formed over the flange part and includes a weak part extending in a direction crossing the extending direction of the flange part.

  According to the first aspect of the present invention, the vehicle rear side of the suspension member and the vehicle rear side of the front side member are connected by the brace including the brace body portion and the flange portion. Moreover, the brace main-body part which comprises the main part of a brace is arrange | positioned by making the vehicle up-down direction into a plate | board thickness direction, and is extended from the vehicle front side to the vehicle rear side. On the other hand, the flange portion extends to one side or the other side with respect to the center line along the extending direction of the brace body portion of the peripheral portion excluding both ends in the extending direction of the brace body portion in the brace body portion. Exist. Further, the flange portion is provided by being bent toward the vehicle upper side or the vehicle lower side with respect to the brace body portion. For this reason, it is possible to ensure the rigidity of the brace against the displacement of the suspension member in the vertical direction of the vehicle, and as a result, it is possible to stably support the suspension member when the vehicle is traveling.

  By the way, when the flange portion is provided in the brace, the rigidity against the collision load from the front side of the vehicle is also improved, so that the deformation of the brace is suppressed when the collision load is input from the front side of the vehicle. As a result, the relative movement of the suspension member to the vehicle rear side with respect to the vehicle body is hindered, and as a result, it becomes difficult to secure a collapse allowance for the front side member. Therefore, in order to secure the crushing margin of the front side member when the collision load is input from the front side of the vehicle, a means for moving the suspension member relative to the vehicle body to the vehicle rear side when the collision load is input is required. Become. And when this means is comprised by several members, the structure of a vehicle body will become complicated.

  Here, in this invention, the weak part is formed over the brace main-body part and the flange part, and the said weak part is extended in the direction which cross | intersects the extension direction of the said brace main-body part and the said flange part. For this reason, when a collision load from the front side of the vehicle is input to the suspension member, the collision load propagates to the brace, and the brace deforms with the fragile portion as a starting point of deformation. As a result, the suspension member moves relative to the vehicle body to the rear side of the vehicle, and the crushing margin of the front side member is secured.

  As described above, the vehicle front structure according to the first aspect of the present invention has a simple structure that ensures the suspension member support rigidity and the front side member is crushed when a collision load is input from the front side of the vehicle. It has an excellent effect of being able to achieve both securing of cost.

It is an expansion perspective view which concerns on this embodiment and shows the structure of a brace. FIG. 2 is an enlarged cross-sectional view showing a configuration of a brace according to the present embodiment (a cross-sectional view showing a state cut along line 2-2 in FIG. 1). It is a perspective view which shows the state of the brace after a collision load input concerning this embodiment. It is a perspective view seen from the vehicles lower part side concerning this embodiment and showing composition of a vehicle front part.

  Hereinafter, an embodiment of a vehicle front structure according to the present invention will be described with reference to FIGS. Note that an arrow FR that is appropriately shown in each drawing indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  First, the overall configuration of the vehicle front portion 12 of the vehicle 10 to which the vehicle front portion structure according to the embodiment of the present invention is applied will be described with reference to FIG. The vehicle front portion 12 is provided with a power unit chamber 14 in which a power unit (not shown) is accommodated. A pair of left and right front side members 18 constituting the skeleton of the vehicle body 16 are arranged on both sides of the power unit chamber 14 in the vehicle width direction, with the longitudinal direction being the longitudinal direction of the vehicle. The front side member 18 includes a front portion 18A extending in the vehicle front-rear direction and a kick portion 18B inclined from the vehicle rear side of the front portion 18A toward the vehicle rear lower side, and has a closed cross section. It is structured. In addition, an upper crash box (not shown) extending in the vehicle front-rear direction is provided at the end portion of the front side member 18 on the vehicle front side. These upper crash boxes are connected at their front end portions by an upper bumper reinforcement (not shown) (hereinafter referred to as upper bumper R / F).

  On the other hand, a suspension member (subframe) 20 constituting the vehicle body 16 is disposed on the vehicle lower side of the front side member 18. The suspension member 20 includes a main body portion 20A configured in an H shape in a plan view and a standing portion 20B that is erected on the vehicle upper side from the main body portion 20A. More specifically, the main body portion 20A supports a pair of left and right suspension arms (not shown), and a front portion of the vehicle is an extension portion 20A1 that extends on the front side of the vehicle and outward in the vehicle width direction. Yes. An end 22A on the vehicle rear side of the side member 22 extending in the vehicle front-rear direction is connected to the extension 20A1. In addition, a lower crash box (not shown) that extends in the vehicle front-rear direction is provided at an end portion of the side member 22 on the vehicle front side. The lower crash boxes are connected at their front ends by a lower bumper reinforcement (not shown) (hereinafter referred to as a lower bumper R / F).

  On the other hand, the standing portion 20B is provided on the vehicle rear side of the extending portion 20A1 in the main body portion 20A, and is formed in a rectangular tube shape having a rectangular frame-like closed cross-sectional structure as a whole in a cross-sectional view. An end 20B1 on the vehicle upper side of the standing portion 20B is formed to have a U-shape extending outward in the vehicle width direction and opened to the vehicle lower side in a side view, and the end 20B1. Further, a front portion 18A of the front side member 18 is fixed by a bolt 24.

  Here, in the present embodiment, a configuration of a pair of left and right braces 26 that connects a vehicle rear side portion of the main body portion 20A of the suspension member 20 and a vehicle rear side end portion 18B1 of the kick portion 18B of the front side member 18 is used. There are features. Hereinafter, the configuration of the brace 26 will be described in detail. The pair of left and right braces 26 are configured symmetrically with respect to the center line in the front-rear direction of the vehicle 10.

  As shown in FIG. 1, the brace 26 includes a brace main body portion 26 </ b> A, a flange portion 26 </ b> B, and a bead portion 26 </ b> C as a fragile portion that constitute a main portion of the brace 26, and is formed by press molding or the like. ing. The brace body portion 26A is disposed in a plate thickness direction in the vehicle vertical direction, and is configured in a plate shape extending from the vehicle front side to the vehicle rear side so as to intersect the vehicle front-rear direction. More specifically, as shown in FIG. 4, the brace main body portion 26 </ b> A is an end portion of the front side member 18 on the vehicle rear side and the vehicle width direction outer side from the vehicle rear side portion of the main body portion 20 </ b> A of the suspension member 20. It extends toward 18B1. In addition, the brace body 26A has a triangular shape in which the front side of the vehicle is the bottom side and each corner is chamfered in an arc shape in plan view. An insertion portion 28 is formed at the vehicle front side end portion 26A1 of the brace body portion 26A, and an insertion portion 30 is formed at the vehicle rear side end portion 26A2 of the brace body portion 26A. Moreover, the peripheral part of the insertion part 28 in end part 26A1 and the peripheral part of the insertion part 30 in end part 26A2 are made into the shape bulged to the vehicle upper side. Accordingly, the end portion 26A1 and the end portion 26A2 are in local contact with the main body portion 20A of the suspension member 20 and the kick portion 18B of the front side member 18, respectively.

  As shown in FIG. 4, the bolt 32 is inserted from the lower side of the brace body portion 26 </ b> A into the inserted portion 28 and fastened to the vehicle rear side portion of the body portion 20 </ b> A of the suspension member 20. . Thereby, one end portion 26 </ b> F of the brace 26 is attached to the suspension member 20. Further, the bolt 32 is inserted into the inserted portion 30 from the lower side of the brace body portion 26 </ b> A and is fastened to the end portion 18 </ b> B <b> 1 on the vehicle rear side of the kick portion 18 </ b> B of the front side member 18. As a result, the other end 26G of the brace 26 is attached to the front side member 18, and the front side member 18 and the suspension member 20 are connected by the brace 26. A long hole 34 is formed in the central portion of the brace body 26A with the extending direction of the brace body 26A as a longitudinal direction. A round hole 34 is formed on the end 26A2 side of the long hole 34. A hole 36 is formed.

  On the other hand, the flange portion 26B extends to one side with respect to the center line along the extending direction of the brace body portion 26A among the peripheral portions excluding the end portion 26A1 and the end portion 26A2 side in the brace body portion 26A. Specifically, the flange portion 26B extends along the peripheral edge portion 26A3 on the outer side in the vehicle width direction of the brace body portion 26A and is provided by being bent toward the vehicle lower side with respect to the brace body portion 26A. It is formed in a rectangular plate shape in side view. That is, as shown in FIG. 2, the longitudinal cross-sectional shape of the brace 26 including the brace body 26A and the flange 26B is L-shaped. Note that, depending on the configuration of the vehicle body 16, the flange portion 26B is on the other side with respect to the center line along the extending direction of the brace body portion 26A among the peripheral portions excluding the end portion 26A1 and the end portion 26A2 side of the brace body portion 26A. It is good also as a structure extended to. That is, the flange portion 26B may be formed on the peripheral edge portion 26A4 on the inner side in the vehicle width direction of the brace body portion 26A. Further, the flange portion 26B may be provided by being bent toward the vehicle upper side with respect to the brace body portion 26A. Further, one brace 26 has a configuration in which a flange portion 26B is provided on the outer side in the vehicle width direction, and the other brace 26 has a configuration in which a flange portion 26B is provided on the inner side in the vehicle width direction. A configuration that is not symmetrical with respect to the center line of the direction is also possible.

  The bead portion 26C is formed across the brace body portion 26A and the flange portion 26B, and extends in a direction intersecting with the extending directions of the body portion 20A and the flange portion 26B. More specifically, the bead portion 26C is formed from the peripheral edge portion 26A3 to the peripheral edge portion 26A4 of the brace main body portion 26A in a plan view, and is orthogonal to the vehicle longitudinal direction when the brace 26 is attached to the vehicle body 16. It extends to. Further, the bead portion 26C extends from the peripheral edge portion 26A3 of the brace body portion 26A to the end portion 26B1 on the vehicle lower side of the flange portion 26B in a side view. The bead portion 26C is formed so as to pass through the end portion 26A2 side of the round hole portion 36 in the brace body portion 26A.

  As shown in FIG. 2, the bead portion 26C bulges upward in the vehicle in the brace body portion 26A, and bulges outward in the vehicle width direction in the flange portion 26B. More specifically, the cross-sectional shape of the bead portion 26C is a V shape in which the lower side of the vehicle is opened in the brace body portion 26A, and a V shape in which the inner side in the vehicle width direction is opened in the flange portion 26B. ing. Depending on the configuration of the vehicle body 16, the bead portion 26C may have a configuration in which the bulging direction is opposite to that described above. Moreover, it is good also as a structure which provides a groove part instead of the bead part 26C as a weak part.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, the vehicle rear side of the suspension member 20 and the vehicle rear side of the front side member 18 are connected by the brace 26 including the brace main body portion 26A and the flange portion 26B. The brace body 26A that constitutes the main part of the brace 26 is disposed with the vehicle vertical direction as the plate thickness direction, and extends from the vehicle front side to the vehicle rear side. On the other hand, the flange portion 26B extends to the peripheral edge portion 26A3 on one side with respect to the center line along the extending direction of the brace main body portion 26A among the peripheral edge portions excluding the end portion 26A1 and the end portion 26A2 side in the brace main body portion 26A. doing. Further, the flange portion 26B is provided by being bent toward the vehicle lower side with respect to the brace body portion 26A. For this reason, it is possible to ensure the rigidity of the brace 26 against the displacement of the suspension member 20 in the vehicle vertical direction, and as a result, it is possible to stably support the suspension member 20 when the vehicle is traveling.

  By the way, when the flange part 26B is provided in the brace 26, the rigidity against the collision load from the vehicle front side is also improved, so that the deformation of the brace 26 is suppressed when the collision load is input from the vehicle front side. As a result, the relative movement of the suspension member 20 to the vehicle rear side with respect to the vehicle body 16 is hindered, and as a result, it becomes difficult to secure a collapse allowance for the front side member 18. More specifically, the collision load from the front side of the vehicle is first input to the upper bumper R / F and the lower bumper R / F. The collision load is absorbed by deformation of the upper bumper R / F, the lower bumper R / F, the upper crash box, and the lower crash box. At this time, if the suspension member 20 does not move relative to the vehicle body 16 relative to the vehicle rear side, the collision load is distributed to the vehicle lower side portion of the vehicle body 16 including the side member 22, the suspension member 20 and the brace 26. The deformation amount of the side member 18 is reduced. Therefore, in order to ensure the crushing margin of the front side member 18 when the collision load is input from the front side of the vehicle, means for moving the suspension member 20 relative to the vehicle body 16 relative to the vehicle rear side when the collision load is input. I need it. And when this means is comprised by several members, the structure of a vehicle body will become complicated.

  Here, in the present embodiment, a bead portion 26C is formed across the brace main body portion 26A and the flange portion 26B, and the bead portion 26C extends in a direction intersecting with the extending directions of the brace main body portion 26A and the flange portion 26B. It extends. For this reason, when a collision load from the front side of the vehicle is input to the suspension member 20, the collision load propagates to the brace 26, and the brace 26 is deformed with the bead portion 26C as a deformation starting point. Specifically, referring to FIG. 3, the brace 26 is buckled and deformed so as to protrude downward on the vehicle as a whole, and breaks in the vicinity of the bead portion 26C depending on the magnitude of the collision load and the shape of the brace 26. To do. When the bulging direction of the bead portion 26C is set in the opposite direction to the above, the brace 26 is deformed so as to be convex toward the vehicle upper side.

  As a result, the suspension member 20 swings about the end portion 20B1 of the standing portion 20B, so that the suspension member 20 moves relative to the vehicle body 16 toward the rear side of the vehicle, and the crushing margin of the front side member is reduced. Secured. As described above, in the present embodiment, it is possible to satisfy both the securing of the supporting rigidity of the suspension member 20 and the securing of the collapse allowance of the front side member 18 when the collision load is input from the front side of the vehicle with a simple configuration.

DESCRIPTION OF SYMBOLS 10 Vehicle 12 Vehicle front part 18 Front side member 20 Suspension member 26 Brace 26A Brace main-body part 26A3 Peripheral part 26A4 Peripheral part 26B Flange part 26C Bead part (fragile part)

Claims (1)

A brace that is arranged with the vehicle vertical direction as the plate thickness direction and extends from the vehicle front side to the vehicle rear side, and constitutes the main part of the brace that connects the vehicle rear side of the suspension member and the vehicle rear side of the front side member The main body,
The brace body part extends to one side or the other side with respect to the center line along the extending direction of the brace body part among the peripheral parts excluding both ends in the extending direction of the brace body part in the brace body part and the brace. A flange provided by being bent toward the vehicle upper side or the vehicle lower side with respect to the main body, and
A fragile part formed across the brace body part and the flange part and extending in a direction intersecting the extending direction of the brace body part and the flange part;
The vehicle front part structure comprised including.

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