WO2020170501A1

WO2020170501A1 - Vehicle front structure

Info

Publication number: WO2020170501A1
Application number: PCT/JP2019/040701
Authority: WO
Inventors: 瞬鈴木; 翼久保山
Original assignee: 三菱自動車工業株式会社
Priority date: 2019-02-19
Filing date: 2019-10-16
Publication date: 2020-08-27
Also published as: JP2022059097A

Abstract

Provided is a vehicle front structure capable of reducing deformation of a cabin in a collision at a vehicle front part. The vehicle front structure has: a subframe structure which has a pair of subframes 131 spaced apart from each other in a vehicle width direction Dw and extending in a vehicle front-rear direction Dh, and which supports wheels 102 of a vehicle 100; a power plant 120 located between the subframes 131; a width-extension member 132 that is joined to a front end portion 131a of each subframe 131 on the vehicle front side Df, protrudes from the subframe 131 outward Do in the vehicle width direction and extends in the vehicle front-rear direction Dh; and a reinforcement member 133 which is disposed toward the rear Dr of the vehicle at a distance from the rear end of the width-extension member 132, and which is joined to the subframe 131. The rear end of the width-extension member 132 and the front end of the reinforcement member 133 are located at positions on the subframes 131 opposing the power plant 120 in the vehicle width direction Dw.

Description

Vehicle front structure

The present invention relates to a vehicle front structure.

Conventionally, as a measure against a small lap offset frontal collision (hereinafter referred to as a small overlap collision) in the front part of the vehicle, an expansion part projecting outward from the front end of the side member of the front subframe in the vehicle width direction is provided to expand the side member. By providing a concave bending-promoting portion at a portion that is separated rearward from the rear end of the portion, the side member is bent and deformed inward in the vehicle width direction to interfere with the power train during a small overlap collision, and the vehicle front portion collides with the collision object. There is known a technique of laterally moving in the direction of escape. (Patent Document 1)

Japanese Patent Laid-Open No. 2018-161982

In the configuration of Patent Document 1, the side member of the subframe may be deformed behind the bending promoting portion. In this case, the power frame cannot be sufficiently pressed by the subframe, and deformation of the cabin is suppressed. Can be difficult.

An object of the present invention is to provide a vehicle front structure that can suppress deformation of the cabin at the time of a collision at the vehicle front.

In order to achieve such an object, a vehicle front portion structure of the present invention has a pair of subframes provided at intervals in the vehicle width direction, extending in the vehicle front-rear direction, and supporting a vehicle wheel. And a power plant located between the subframes, a widening member that is joined to a front end portion of the subframe on the front side of the vehicle, protrudes outward from the subframe in the vehicle width direction, and extends in the vehicle front-rear direction, and a rear end of the widening member. And a reinforcing member which is arranged at a space rearward of the vehicle and is joined to the sub-frame. The rear end of the widening member and the front end of the reinforcing member are located at positions facing the power plant of the subframe in the vehicle width direction.

According to the present invention, it is possible to realize a vehicle front structure capable of suppressing deformation of the cabin at the time of a collision at the vehicle front.

The top view which shows the structure of the vehicle front part structure of embodiment. The perspective view which shows the principal part of the structure of FIG. The top view which partially expands and shows the structure of FIG. The perspective view which shows the principal part of the sub-frame 131, the widening member 132, and the reinforcing member 133. The perspective view which shows the structure of FIG. 4 from a different angle. FIG. 4A is a top view showing the operation of the vehicle front structure of the embodiment, in which FIG. 7A is a state immediately before the end of the vehicle front portion on the driver seat 111 side is deformed by a collision, and FIG. The state where the end portion on the seat 111 side is being deformed by the collision, (C) shows the state after the end portion on the driver seat 111 side of the vehicle front portion is deformed by the collision. The side view corresponding to FIG.

In each figure, the vehicle front-rear direction Dh (vehicle front Df and vehicle rear Dr), the vehicle width direction Dw (vehicle width direction inner Di and vehicle width direction outer Do), and the vehicle vertical direction Dv (vehicle upper Du and vehicle lower Dd) Is indicated by an arrow. The vehicle width direction inner side Di is a side toward the vehicle width direction center. The vehicle width direction outer side Do is a side away from the vehicle width direction center.

[Structure of vehicle front structure]
The configuration of the vehicle front structure of the embodiment will be described with reference to FIGS. 1 to 5.

FIG. 1 is a top view showing the configuration of the vehicle front structure of the embodiment. FIG. 2 is a perspective view showing a main part of the configuration of FIG. FIG. 3 is a partially enlarged top view of the configuration of FIG. FIG. 4 is a perspective view showing essential parts of the sub-frame 131, the widening member 132, and the reinforcing member 133. FIG. 5 is a perspective view showing the configuration of FIG. 4 from a different angle.

As shown in FIG. 1, the vehicle 100 is provided with a cabin 110, which is a boarding space, in the center of the vehicle front-rear direction Dh. The vehicle 100 is provided with a power plant 120 and a sub-frame structure 130 that surrounds the power plant 120 and configures the vehicle body 101 in front of the cabin 110 in the vehicle Df. The power plant 120 is, for example, an engine, a motor, a transmission, or the like. The power plant 120 is provided on the inner side Di of the sub frame 131 in the vehicle width direction.

The subframe structure 130 includes a subframe 131, a widening member 132, and a reinforcing member 133. The above members included in the sub-frame structure 130 will be described in order.

As shown in FIGS. 1 to 5, a pair of sub-frames 131 are provided on the vehicle width direction outer side Do of the power plant 120 at intervals in the vehicle width direction Dw, and have a prismatic shape extending in the vehicle front-rear direction Dh. Is formed in. The sub-frame 131 includes an upper surface 131c that faces the upper side of the vehicle, a lower surface 131d that faces the lower side, an outer surface 131e that faces the outer side Do in the vehicle width direction, and an inner side surface 131f that faces the inner side. The sub-frame 131 has a recess 131i that is recessed outward Do in the vehicle width direction at a position facing the power plant 120 on the upper surface 131c and the inner side surface 131f. Specifically, in the present embodiment, the recess 131i is provided on the upper portion of the inner side surface 131f, and the upper surface 131c is cut out in accordance with the recess 131i of the inner side surface 131f. The recess 131i is for avoiding interference between the subframe 131 and the power plant 120. At the rear end portion 131b of each sub-frame 131, the lower arm 134 is joined so as to project from the outer side surface 132e to the vehicle width direction outer side Do, and the suspension cross 135 is joined so as to connect the inner side surfaces 131f. The lower arm 134 is a member that supports the wheels 102 of the vehicle 100. That is, the subframe structure 130 supports the wheel 102 via the lower arm 134.

As shown in FIG. 1 to FIG. 5, the widening member 132 is joined to the front end portion 131a of each sub-frame 131 and projects from the outer side surface 132e to the vehicle width direction outer side Do. It is formed in a substantially triangular shape in a plan view approaching 132e. In the present embodiment, the widening member 132 projects further to the vehicle width direction outer side Do than the side member (not shown). The widening member 132 is formed in a substantially U-shape with a cross section opening to the vehicle width direction inner side Di, and is joined to the upper surface 131c and the lower surface 131d of the subframe 131 so as to sandwich the subframe 131 in the vehicle vertical direction. It has a front end portion 132a that faces the front of the vehicle. The rear end of the widening member 132 extends to a position facing the power plant 120 in the vehicle width direction Dw, that is, a position facing the recess 131i in the vehicle width direction Dw in the present embodiment. A convex portion 132f protruding from the front end portion 132a toward the vehicle front Df is provided at the vehicle width direction outer end portion of the front end portion 132a of the widening member 132. The length of the widening member 132 in the vehicle front-rear direction Dh is set to a ratio of 1:7 or more in the portion of the convex portion 132f and the portion from the front end portion 132a to the rear end portion 132b as an example in the embodiment. Is desirable.

As shown in FIGS. 1 to 5, the reinforcing member 133 is arranged at a distance to the rear of the vehicle Dr from the rear end of the widening member 132 and is joined to the sub-frame 131. The reinforcing member 133 is formed in a substantially L-shaped cross section extending in the vehicle front-rear direction Dh, and is joined to the upper surface 131c of the sub-frame 131 and the inner side surface 131f. The reinforcing member 133 is preferably provided only on the upper portion of the inner side surface 131f of the sub-frame 131, and in the present embodiment, it is provided at the location where the recess 131i of the inner side surface 131f is formed. The front end of the reinforcing member 133 is arranged at a position facing the power plant 120 in the vehicle width direction Dw, that is, in the recess 131i in the present embodiment. Further, the rear end of the reinforcing member 133 is located in front of the joint with the lower arm 134 of the subframe 131.

The front end 131a of each sub-frame 131 is joined by a front end cross 136 extending in the vehicle width direction Dw. The front end 131a of each sub-frame 131 and the front end 132a of each widening member 132 are connected to the vehicle front Df. The extending crush box 137 is joined. The front end of each crash box 137 is connected by a lower bumper beam 138 extending in the vehicle width direction Dw. Each crush box 137 extends to the front of the vehicle with respect to the front end cross 136, and crushes during a collision to absorb collision energy. The convex portion 132f is located on the vehicle width direction outer side Do of each crush box 137, and the front end thereof is located rearward of the front end of the crush box 137.

[Operation of vehicle front structure]
The operation of the vehicle front structure of the embodiment will be described with reference to FIGS. 6 and 7.

6A and 6B are top views showing the operation of the vehicle front structure of the embodiment. FIG. 6A is a state immediately before the subframe 131 is deformed by a collision, and FIG. 6B is a state in which the subframe 131 is deformed by a collision. The state in the middle of the process, (C) shows the state after the subframe 131 is deformed by the collision. FIG. 7 is a side view corresponding to FIG.

As shown in FIGS. 6A and 7A, the embodiment assumes a so-called small overlap collision. That is, it is assumed that the barrier 200 collides with a small area (25% of the area from the end in the vehicle width direction) at the front of the vehicle 100. At this time, the barrier 200 often passes the outside Do of the side member (not shown) in the vehicle width direction, so that the side member cannot sufficiently absorb the collision energy. Therefore, by providing the widening member 132 on the sub-frame 131, the widening member 132 is caused to collide with the barrier 200 to cope with a small overlap collision.

As shown in FIGS. 6B and 7B, the convex portion 132 f of the widening member 132 collides with the barrier 200. A collision load is input to the sub-frame 131 via the widening member 132. Here, the reinforcing member 133 is arranged behind the widening member 132 with a space. The portion of the sub-frame 131 where the widening member 132 is joined and the portion where the reinforcing member 133 is joined are reinforced by the widening member 132 and the reinforcing member 133, so that the rigidity is higher than the other portions. There is. Therefore, the portion of the sub-frame 131 between the widening member 132 and the reinforcing member 133 is relatively less rigid than the portions before and after that. When a collision load is input to the sub-frame 131, the sub-frame 131 bends inward in the vehicle width direction Di with the relatively low rigidity portion (break point 131j) as a boundary. Accordingly, the break point 131j of the sub-frame 131 presses the power plant 120 facing in the vehicle width direction Dw toward the vehicle width direction inner side Di.

As shown in FIGS. 6(C) and 7(C), the break point 131j of the sub-frame 131 is further deformed to further press the power plant 120 toward the vehicle width direction inner side Di. In this way, the deformable sub-frame 131 pushes the power plant 120 inward in the vehicle width direction Di (the side opposite to the collision side of the offset collision), and moves the vehicle 100 to the side opposite to the collision side.

[Effect of vehicle front structure]
The effects of the vehicle front structure of the embodiment will be described.

In the vehicle front structure of the embodiment, a widening member 132 that is joined to the front end portion 131a of the subframe 131 and extends outwardly in the vehicle width direction Do and a vehicle rearward Dr of the widening member 132 are joined to the subframe 131 with a gap. The reinforcing member 133 and the power plant 120 provided on the inner side Di in the vehicle width direction with respect to the sub-frame 131 are included. The rear end of the widening member 132 and the front end of the reinforcing member 133 are located at positions facing the power plant 120 in the vehicle width direction Dw.

According to such a vehicle front structure, at the time of a small overlap collision, the sub-frame 131 bends toward the vehicle width direction inner side Di with the portion (break point 131j) between the widening member 132 and the reinforcing member 133 as a boundary. To do. At this time, since the rear side of the bending point 131j of the sub-frame 131 is reinforced by the reinforcing member 133, the portion rearward of the bending point 131j (the portion where the reinforcing member 133 is provided) is deformed when the sub-frame 131 is deformed. Can be suppressed. This makes it possible to stabilize and bend the position of the break point 131j of the sub-frame 131, and to maintain a large amount of protrusion of the bent portion inward in the vehicle width direction Di when the sub-frame 131 is deformed. Accordingly, when the sub-frame 131 bends toward the vehicle width direction inner side Di, the power plant 120 can be sufficiently pressed to the vehicle width direction inner side Di (the side opposite to the collision side of the offset collision), and the vehicle 100 Can be moved to the side opposite to the collision side. As a result, the deformation of the cabin 110 can be suppressed at the time of a collision at the front of the vehicle. In addition, in the present embodiment, the rear end of the reinforcing member 133 is located in front of the joint with the lower arm 134 of the sub-frame 131, and therefore, the sub-frame 131g includes the reinforcing member 133 and the sub-member 131. Since there is another break point 131k between the frame 131 and the joint with the lower arm 134, the sub-frame 131 can be more stably bent at the break point 131j.

According to the vehicle front structure of the embodiment, the reinforcing member 133 is joined only to the upper surface 131c and the inner side surface 131f of the subframe 131. As a result, the rigidity of the lower surface 131d and the outer surface 131e can be suppressed while increasing the rigidity of the upper surface 131c and the inner side surface 131f of the sub-frame 131, so that the sub-frame 131 can be deformed to be bent upward. In addition, it is possible to prevent the deformation to the inner side Di in the vehicle width direction from being hindered. As a result, the power plant 120 can be pressed sufficiently.

According to the vehicle front structure of the embodiment, the widening member 132 is joined to the subframe 131 so as to sandwich the upper surface 131c and the lower surface 131d of the subframe 131 in the vehicle upward direction. As a result, it is possible to prevent the portion of the sub-frame 131, to which the widening member 132 is joined, from being deformed in the vehicle vertical direction Dv, and to prevent the position of the break point 131j in the vehicle vertical direction Dv from varying. As a result, the break point 131j of the sub-frame 131 can be more reliably pressed against the power plant 120, and the power plant 120 can be pressed sufficiently. Further, by suppressing the deformation of the sub-frame 131 in the vehicle vertical direction Dv, the collision load can be transmitted to the power plant 120 more efficiently. If the break point 131j of the sub-frame 131 moves to Dd below the vehicle, the sub-frame 131 may sneak below the power plant 120, and the power plant 120 may not be sufficiently pressed.

According to the vehicle front structure of the embodiment, the sub-frame 131 has the recess 131i recessed outward in the vehicle width direction Do on the inner side surface 131f on the vehicle width direction inner side Di facing the power plant 120. There is. The rear end of the widening member 132 and the front end of the reinforcing member 133 are located at positions facing the recess 131i in the vehicle width direction Dw. By providing the break point 131j in the recess 131i for avoiding the interference between the sub-frame 131 and the power plant 120, the break point 131j can be set at a location where the rigidity of the sub-frame 131 is lowered by the recess 131i. Therefore, the position of the break point 131j can be controlled more. In addition, in this embodiment, since the recess 131i is recessed in an arc shape in a plan view, the position of the break point 131j can be further controlled by setting the break point 131j at the top of the recess in the arc shape. ..

According to the vehicle front portion structure of the embodiment, the front end portion 132a of the widening member 132 is provided with the convex portion 132f protruding toward the vehicle front Df. Accordingly, at the time of collision of the vehicle 100, the collision load can be transmitted to the widening member 132 at an early stage, and the bending of the sub-frame 131 in the vehicle width direction Dw can be promoted. Further, by providing the convex portion 132f at the vehicle width direction outer end portion of the front end portion 132a of the widening member 132, the entire length of the member that receives the collision load is maximized, and the load input is performed outside the widening member 132 in the vehicle width direction. It is possible to concentrate on the end portion, and it is possible to increase the bending moment of the sub-frame 131 in the vehicle width direction Dw.

[Aspect of front structure of vehicle]
In carrying out the present invention, the above-described embodiment is an example, and various specific modes can be implemented.

For example, in the embodiment, it is assumed that the widening member 132 and the reinforcing member 133 are joined to the sub-frames 131 on the driver seat 111 side and the passenger seat 112 side, respectively. However, the present invention is not limited to such an embodiment, and the widening member 132 and the reinforcing member 133 may be joined to only the sub-frame 131 on the driver's seat 111 side, for example.

100... Vehicle, 101... Car body, 102... Wheels, 110... Cabin, 111... Driver's seat, 112... Passenger seat, 120... Power plant, 130... Subframe structure, 131... Subframe, 131a... Front end part, 131b... Rear end part, 131c... Upper surface, 131d... Lower surface, 131e... Outer surface, 131f... Inner side surface, 131i... Recess, 131j... Break point, 131k... Break point, 132... Widening member, 132a... Front end part, 132b... Rear Ends, 132c... Top surface, 132d... Bottom surface, 132e... Outer surface, 132f... Convex section, 133... Reinforcing member 133a... Front end section, 133b... Rear end section, 133c... Top surface, 133d... Inner side surface, 134... Lower arm, 135... Suspension cross, 136... Front end cross, 137... Crash box, 138... Lower bumper beam, 200... Barrier, Dh... Vehicle front-rear direction, Df... Vehicle front, Dr... Vehicle rearward, Dw... Vehicle width direction, Di... Inside of the vehicle width direction, Do... Outside of the vehicle width direction, Dv... Vehicle vertical direction, Du... Vehicle upper side, Dd... Vehicle lower side.

Claims

A pair of subframe structures that are provided at intervals in the vehicle width direction, have subframes that extend in the vehicle front-rear direction, and support the wheels of the vehicle;
A power plant located between the sub-frames,
A widening member that is joined to a front end portion of the subframe on the front side of the vehicle and that extends from the subframe to the outside in the vehicle width direction and extends in the vehicle front-rear direction,
A reinforcing member which is arranged at a distance to the rear of the vehicle from the rear end of the widening member and is joined to the sub-frame;
Have
The vehicle front structure, wherein a rear end of the widening member and a front end of the reinforcing member are located at positions facing the power plant of the subframe in the vehicle width direction.
The vehicle front structure according to claim 1, wherein the reinforcing member is formed in a substantially L-shaped cross section that is joined to the upper surface of the sub-frame and the inner side surface in the vehicle width direction.
The vehicle front structure according to claim 2, wherein a portion of the reinforcing member, which is joined to an inner side surface of the subframe in the vehicle width direction, is joined to an upper portion of the inner side surface in the vehicle width direction.
The said widening member is joined to the upper surface and lower surface of the said sub-frame so that the upper surface and the lower surface of the said sub frame may be pinched|interposed from the vehicle up-down direction, The any one of Claim 1 to 3 characterized by the above-mentioned. Vehicle front structure.
The sub-frame, on the vehicle width direction inner side surface of the portion facing the power plant, has a recessed portion recessed outward in the vehicle width direction,
The vehicle front portion according to any one of claims 1 to 4, wherein a rear end of the widening member and a front end of the reinforcing member are located at positions facing the recess in the vehicle width direction. Construction.
The vehicle front structure according to any one of claims 1 to 5, wherein the front end portion of the widening member is provided with a convex portion protruding from the front end portion toward the front of the vehicle.
The vehicle front structure according to claim 6, wherein the convex portion is provided at an outer end portion in the vehicle width direction of the front end portion of the widening member.