JP2010100199A - Vehicle body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a bending moment in a vehicle width inner direction generated at a rear end portion of an apron upper member when a front part of a vehicle collides with an inclined collision object. <P>SOLUTION: A moment generation arm 30, with its longitudinally intermediate portion serving as a bend 30A protruding outwardly in a vehicle width direction, is disposed outside in the vehicle width direction of the apron upper member 16. A rear end portion 30D of the moment generation arm 30 is connected with the rear end portion 16A of the apron upper member 16, and a front end portion 30F is connected to a front wall portion 16D via a fender bracket 34. When the front part of the vehicle collides with the inclined collision object and the apron upper member 16 is deformed in the direction of being drawn into the inside in the vehicle width direction along with a front side member 12 of the colliding side, the bending moment in the vehicle width inner direction generated at the rear end portion 16A of the apron upper member 16 can be suppressed with a moment generated in an opposite direction by the moment generation arm 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front part structure, and more particularly to a vehicle body front part structure of a vehicle such as an automobile provided with a pair of left and right apron upper members disposed in the longitudinal direction of the vehicle body above a front side member.

2. Description of the Related Art Conventionally, a vehicle front structure of a vehicle such as an automobile provided with a pair of left and right apron upper members disposed in the longitudinal direction of the vehicle body above a front side member is known (see, for example, Patent Document 1). . In this technique, the upper rear ends of the kick portions of the left and right front side members are connected by a closed cross-sectional structure formed by a dash cross member and a dash panel and extending along the vehicle width direction. It extends upward behind the suspension tower and is coupled to the apron upper member.
JP 2004-90818 A

  However, in this vehicle body front structure, the vehicle body front portion collides with a collision body such as a wall inclined with respect to the longitudinal direction of the vehicle body, and the front side member on the collision side is deformed so as to be drawn inward in the vehicle width direction. In this case, the apron upper member connected to the front side member by the suspension tower is also drawn inward in the vehicle width direction. For this reason, a bending moment in the vehicle width inside direction is generated at the rear end portion (root portion) of the apron upper member. Further, when the bending moment in the vehicle width inward direction is generated at the rear end portion of the apron upper member, the front pillar to which the apron upper member is coupled is deformed, so that the lower portion of the front pillar is connected. Thus, it becomes difficult to efficiently transmit the collision load to the members constituting the skeleton of the vehicle body.

  In view of the above facts, the present invention provides a vehicle body front structure that can suppress a bending moment in the vehicle width inward direction generated at the rear end portion of the apron upper member when the vehicle body front portion collides with an inclined collision body. Is the purpose.

  According to the first aspect of the present invention, a pair of left and right front side members disposed along the longitudinal direction of the vehicle body at both lower portions in the vehicle width direction of the front portion of the vehicle body, and along the longitudinal direction of the vehicle body above the front side member. A pair of left and right apron upper members disposed; and a pair of left and right suspension towers disposed between the front side member and the apron upper member and connecting the front side member and the apron upper member; A pair of left and right front pillars that are disposed along the vehicle body vertical direction at both ends in the vehicle width direction of the front part of the passenger compartment and that are joined to the rear end of the apron upper member; and the outer side in the vehicle width direction of the apron upper member The apron upper member is disposed along the apron upper member, the front end is connected to the front end of the apron upper member, and the rear end is the apron. The middle part in the front-rear direction is a bent part that protrudes outward in the vehicle width direction, and is bent from the bent part as a starting point due to a compressive load acting from the front of the vehicle body toward the rear of the vehicle body. And a moment generating means for generating a moment toward the outside in the vehicle width direction at the rear end of the apron upper member by being deformed.

  Therefore, when a pair of left and right apron upper members disposed along the front-rear direction of the vehicle body compresses and deforms from the front of the vehicle body toward the rear of the vehicle body when the vehicle collides, the vehicle width of the apron upper member It is arranged along the apron upper member on the outer side in the direction, the front end is connected to the front end of the apron upper member, the rear end is connected to the rear end of the apron upper member, and the middle part in the front-rear direction is the vehicle width The moment generating means, which is a bent portion protruding outward in the direction, is bent and deformed from the bent portion by a compressive load acting from the front of the vehicle body toward the rear of the vehicle body. As a result, a moment toward the outside in the vehicle width direction is generated at the rear end portion of the apron upper member. Therefore, the front part of the vehicle body collides with a collision body such as a wall inclined with respect to the longitudinal direction of the vehicle body, and the front side member on the collision side and the apron upper member on the collision side are pulled inward in the vehicle width direction. In the case of deformation, the bending moment in the vehicle width inward direction generated at the rear end portion of the apron upper member can be suppressed by the reverse moment generated by the moment generating means. As a result, the deformation of the front pillar to which the rear end portion of the apron upper member is coupled is suppressed, and the collision load is efficiently transmitted to the member forming the skeleton of the vehicle body such as the rocker to which the lower portion of the front pillar is coupled. be able to.

  The vehicle body front part structure according to the first aspect of the present invention can suppress the bending moment in the vehicle width inner direction generated at the rear end part of the apron upper member when the vehicle body front part collides with an inclined collision body.

  1st Embodiment of the vehicle body front part structure in this invention is described according to FIGS.

  In the figure, the arrow UP indicates the vehicle body upward direction, the arrow FR in the figure indicates the vehicle body front direction, and the arrow IN in the figure indicates the vehicle width inside direction.

  FIG. 1 is a perspective view of a vehicle body front part structure according to the present embodiment as viewed obliquely from the front of the vehicle body, and FIG. 2 is a plan view.

  As shown in FIG. 1, a pair of left and right front side members 12 (a front side member on the right side of the vehicle is not shown) is provided at the vehicle body front portion 10 of the present embodiment along the vehicle body front-rear direction at the lower portions at both ends in the vehicle width direction. It is arranged. These front side members 12 have a closed cross-sectional structure extending along the longitudinal direction of the vehicle body. Although not shown, a front bumper is attached to the front end of the front side member 12, and a kick portion that is bent downward and obliquely rearward is formed at the rear side of the front side member 12 in the vehicle body.

  A pair of left and right apron upper members 16 (the apron upper member on the left side of the vehicle is not shown) is disposed along the vehicle front-rear direction above the vehicle body of the pair of left and right front side members 12 and outside the vehicle width direction. It is installed. These apron upper members 16 have a closed cross-sectional structure extending along the longitudinal direction of the vehicle body. Note that the front ends of these apron upper members 16 are on the rear side of the vehicle body from the front ends of the front side members 12. A pair of left and right suspension towers 18 are disposed between the pair of left and right front side members 12 and the apron upper member 16. The suspension tower 18 connects the front side member 12 and the apron upper member 16. ing.

  A pair of left and right front pillars 20 are disposed along the vertical direction of the vehicle body at both ends in the vehicle width direction of the front part of the vehicle compartment 19. The front pillar 20 has an intermediate part in the vertical direction in front of the door belt line. A bent portion 20A is formed. Further, a rear end portion 16A of the apron upper member 16 is coupled to the bent portion 20A of the front pillar 20 from the front side of the vehicle body. More specifically, a joining flange 16F formed at the rear end portion 16A of the apron upper member 16 is welded to the bent portion 20A of the front pillar 20.

  A pair of left and right rockers 22 are disposed along the vehicle body vertical direction at the lower portions of both ends of the vehicle compartment 19 in the vehicle width direction. These rockers 22 have a closed cross-sectional structure extending along the vehicle body longitudinal direction. Yes. Further, the lower portion 20 </ b> B of the front pillar 20 is coupled to the front end portion 22 </ b> A of the rocker 22. On the other hand, between the bent portions 20A of the left and right front pillars 20, a cowl 24 is disposed along the vehicle width direction, and both end portions 24A of the cowl 24 in the vehicle width direction are connected to the bent portions 20A of the front pillar 20. Are combined.

  A moment generating arm 30 as a moment generating means is disposed along the apron upper member 16 on the outer side in the vehicle width direction of the left and right apron upper members 16. These moment generating arms 30 are formed of a U-shaped bar whose cross-sectional shape viewed from the longitudinal direction has an opening facing outward in the vehicle width direction.

  As shown in FIG. 2, the moment generating arm 30 has a bent portion 30 </ b> A whose middle portion in the front-rear direction is convex outward in the vehicle width direction, and the front portion 30 </ b> B It is inclined toward the outside in the width direction. Further, the rear portion 30C of the moment generating arm 30 is inclined from the outside in the vehicle width direction at the front of the vehicle body toward the inside in the vehicle width direction at the rear of the vehicle body, and the plan view shape of the moment generating arm 30 is a square shape. .

  A rear end portion 30D of the moment generating arm 30 extends toward the rear of the vehicle body, and a bottom portion 30E having a U-shaped cross section at the rear end portion 30D is an outer wall in the vehicle width direction at the rear end portion 16A of the apron upper member 16. It is fixed to the portion 16B from the outside in the vehicle width direction by a fastening member 32 such as a bolt. On the other hand, a front wall portion 16D is provided at the front end portion 16C of the apron upper member 16, and a fender bracket 34 is attached to the front wall portion 16D.

  As shown in FIG. 3, the fender bracket 34 is formed of a long plate material disposed along the vehicle width direction, and the vehicle width direction inner end portion 34 </ b> A is a front wall portion 16 </ b> D of the apron upper member 16. Is fixed from the front side of the vehicle body by a fastening member 36 such as a bolt.

  As shown in FIG. 2, a bent portion 34B is formed at the vehicle width direction outer side end portion of the fender bracket 34 so as to be inclined to the vehicle body front side and the vehicle width inner side. A fender panel 40 constituting the side surface of the portion 10 is attached. Further, the front end portion 30F of the moment generating arm 30 extends toward the inner side in the vehicle width direction, and the bottom portion 30G having a U-shaped cross section at the front end portion 30F is formed in the vehicle width direction intermediate portion 34C of the fender bracket 34. It is fixed from the front side of the vehicle body by a fastening member 42 such as a bolt.

  Therefore, as shown in FIG. 4, when the front part of the vehicle body collides with the collision body and a compressive load (arrow F1 in FIG. 4) acts on the moment generating arm 30 from the front of the vehicle body to the rear of the vehicle body, a moment is generated. The arm 30 is bent and deformed starting from a bent portion 30A that protrudes outward in the vehicle width direction. Further, the moment generating arm 30 is bent and deformed as shown in FIG. 4, and the bent portion 30A and the rear portion 30C are rotated rearward (in the direction of arrow A in FIG. 4), whereby the rear end portion 16A of the apron upper member 16 is obtained. In this case, a moment M1 is generated in the vehicle width direction outward with the rear end portion 16A as the center P0.

  On the other hand, the front part 10 of the vehicle body collides with a collision body K such as a wall inclined with respect to the longitudinal direction of the vehicle body, and the front side member 12 on the colliding side is pulled inward in the vehicle width direction (the direction of arrow B in FIG. 4). ), The apron upper member 16 on the side that has collided via the suspension tower 18 is deformed in the direction in which the apron upper member 16 is pulled inward in the vehicle width direction (the direction of arrow B in FIG. 4). At this time, the bending moment M2 in the vehicle width inward direction generated at the rear end portion 16A of the apron upper member 16 can be suppressed by the reverse moment M1 generated by the moment generating arm 30.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 1, in the present embodiment, a pair of left and right apron upper members 16) are respectively provided above the vehicle body of the pair of left and right front side members 12 in the vehicle body front portion 10 and outside the vehicle width direction. Arranged along the front-rear direction. For this reason, as shown in FIG. 4, when the vehicle body front portion 10 collides with a collision body K such as a wall inclined with respect to the front-rear direction of the vehicle body, the front side member 12 on the collision side moves in the vehicle width direction. The apron upper member 16 on the side collided via the suspension tower 18 is pulled inward in the vehicle width direction (arrow B direction in FIG. 4). Deform. Therefore, a bending moment M2 in the vehicle width inner direction is generated at the rear end portion 16A of the apron upper member 16.

  At this time, in this embodiment, the moment generating arm 30 is disposed along the apron upper member 16 on the outer side in the vehicle width direction of the apron upper member 16, and the moment generating arm 30 has an intermediate portion in the vehicle width direction in the front-rear direction. The shape is a square shape in a plan view formed as an outwardly convex bent portion 30A. Therefore, as shown in FIG. 4, when the front of the vehicle collides with a collision body K such as an inclined wall, a compressive load (arrow F1 in FIG. 4) is applied to the moment generating arm 30 from the front of the vehicle to the rear of the vehicle. When acting, the moment generating arm 30 is bent and deformed starting from the bent portion 30A. Further, the moment generating arm 30 is bent and deformed as shown in FIG. 4, and the bent portion 30A and the rear portion 30C are rotated rearward (in the direction of arrow A in FIG. 4), whereby the rear end portion 16A of the apron upper member 16 is obtained. In this case, a moment M1 is generated in the vehicle width direction outward with the rear end portion 16A as the center P0.

  As a result, the bending moment M2 in the vehicle width inward direction generated at the rear end portion 16A of the apron upper member 16 due to the collision of the vehicle body front portion 10 with the collision body K such as a wall inclined with respect to the longitudinal direction of the vehicle body. Can be suppressed by a reverse moment M1 generated at the rear end portion 16A of the apron upper member 16 by the moment generating arm 30 which compresses and deforms due to a collision. For this reason, it can suppress that the bending part 20A of the front pillar 20 to which the rear end part 16A of the apron upper member 16 is coupled is twisted and deformed by the moment M2. Accordingly, the rocker 22 to which the lower part 20B of the front pillar 20 is connected from the apron upper member 16 through the front pillar 20 and the upper part of the front pillar 20 are connected to form a skeleton of the vehicle body such as a roof side rail (not shown). The collision load can be efficiently transmitted to the member.

  In the present embodiment, the front end portion 30F of the moment generating arm 30 is coupled to the front wall portion 16D of the apron upper member 16 via the fender bracket 34 by the fastening member 36 such as a bolt. Can be reduced.

  Note that the magnitude of the moment M1 generated by the moment generating arm 30 can be adjusted by the length L1 of the rear portion 30C of the moment generating arm 30. For this reason, the length L1 of the rear portion 30C of the moment generating arm 30 is determined according to the magnitude of the moment M1 to be generated in consideration of the vehicle body structure and the like.

  Next, a second embodiment of the vehicle body front structure according to the present invention will be described with reference to FIG.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, in this embodiment, the front end portion 30H of the moment generating arm 30 extends toward the front of the vehicle body, and the bottom 30J having a U-shaped cross section at the front end portion 30H is the apron upper member 16. The front end portion 16C is directly fixed to the outer wall portion 16E in the vehicle width direction by a fastening member 50 such as a bolt.

  Accordingly, in the present embodiment as well, as in the first embodiment, the front pillar 20 to which the rear end portion 16A of the apron upper member 16 is coupled when the front portion of the vehicle body collides with a collision body such as an inclined wall is bent. The portion 20A can be prevented from being twisted and deformed by the moment M2. Therefore, a rocker 22 to which the lower part 20B of the front pillar 20 is connected from the apron upper member 16 through the front pillar 20, and an upper part of the front pillar 20 are connected to constitute a skeleton of the vehicle body such as a roof side rail (not shown). The collision load can be efficiently transmitted to the member to be performed.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, the plan view shape of the moment generating arm 30 as the moment generating means in the present invention is not limited to the shape shown in FIG. 2, but the length L1 of the rear portion 30C and the length L2 of the front portion 30B in the moment generating arm 30. The angle θ1 of the bent portion 30A may be changed. Further, the bent portion 30A may have a curved shape with roundness.

  Further, the moment generating means is not limited to the moment generating arm 30 formed of a bar having a U-shaped cross section shown in FIG. 3, and is disposed along the apron upper member 16 on the outer side in the vehicle width direction of the apron upper member 16. Provided, the front end is connected to the front end 16C of the apron upper member 16, the rear end is coupled to the rear end 16A of the apron upper member 16, and the intermediate portion in the front-rear direction protrudes outward in the vehicle width direction. It is a bent part, and a moment toward the outside in the vehicle width direction is generated at the rear end part 16A of the apron upper member 16 by being bent and deformed from the bent part by a compressive load acting from the front of the vehicle body to the rear of the vehicle body If it is the structure to be made, it is good also as other structures, such as a bar material of a hat cross-sectional shape, a pipe material, and a board | plate material.

  Further, the fixing of the moment generating arm 30 to the apron upper member 16 is not limited to the coupling by a fastening member such as a bolt, and may be another fixing method such as welding.

  Further, the cross-sectional shapes of the front side member and the apron upper member in the vehicle to which the vehicle body front structure of the present invention is applied are not limited to the above embodiments.

It is the perspective view seen from the vehicle diagonal front side which shows the left side of the vehicle body front part structure which concerns on 1st Embodiment of this invention. It is a top view which shows the left side of the vehicle body front part structure which concerns on 1st Embodiment of this invention. It is sectional drawing of the site | part along the 3-3 line of FIG. It is sectional drawing corresponding to FIG. 2 which shows the deformation | transformation state of the vehicle body front part structure which concerns on 1st Embodiment of this invention. It is a top view which shows the left side of the vehicle body front part structure which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car body front part 12 Front side member 16 Apron upper member 16A Rear end part of apron upper member 16C Front end part of apron upper member 16D Front wall part of apron upper member 18 Suspension tower 20 Front pillar 22 Rocker 24 Cowl 30 Moment generating arm ( Moment generation means)
30A Bent part of moment generating arm 30B Front part of moment generating arm 30C Rear part of moment generating arm 30D Rear end part of moment generating arm 30F Front end part of moment generating arm 30H Front end part of moment generating arm 34 Fender bracket 40 Fender panel

Claims (1)

A pair of left and right front side members disposed along the longitudinal direction of the vehicle body at both lower ends in the vehicle width direction of the front portion of the vehicle body;
A pair of left and right apron upper members disposed along the longitudinal direction of the vehicle body above the front side member;
A pair of left and right suspension towers disposed between the front side member and the apron upper member, and connecting the front side member and the apron upper member;
A pair of left and right front pillars disposed along the vehicle body vertical direction at both ends in the vehicle width direction of the front portion of the passenger compartment, and coupled to the rear end of the apron upper member;
The apron upper member is disposed along the apron upper member on the outer side in the vehicle width direction, the front end portion is connected to the front end portion of the apron upper member, and the rear end portion is connected to the rear end portion of the apron upper member. The apron is formed by bending and deforming from the bent portion by a compressive load acting from the front of the vehicle body toward the rear of the vehicle body. A moment generating means for generating a moment toward the outside in the vehicle width direction at the rear end of the upper member;
A vehicle body front structure.

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