JP2004330948A - Front body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front body structure of an automobile capable of remarkably improving energy absorbing efficiency due to loads applied from the front of the vehicle body. <P>SOLUTION: In the front body structure, a front side member 1 and a bumper reinforcement 2 connected the front of the front side member 1 through a connection member 3 are off-set in the vertical direction of the vehicle body. A front side member connection member 11 arranged apart from the bumper reinforcement 2 in the vertical direction of the vehicle body is provided in the vehicle width direction in front of the front side member 1. The connection member 3 is provided in the front side of the vehicle body, and it includes an upper and lower connection parts 3a, 3b connected to the bumper reinforcement 2 and the front side member connection member 11 respectively, and a backward connection part 3c arranged in the backside of the vehicle body and connected to the front end part of the front side member 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a front body structure of an automobile, and more particularly to a structure of a connecting portion between a front side member disposed in the front-rear direction on both sides in a vehicle width direction and a bumper reinforce disposed in front of the front side member. About.
[0002]
[Prior art]
In general, the front body structure of an automobile is provided with a pair of front side members extending in the front-rear direction on both sides in the vehicle width direction and extending in the vehicle width direction in front of each of these front side members, thereby increasing the strength and rigidity of the front bumper. It consists of a bumper reinforce for reinforcement. Each of the front side members and the bumper reinforce are connected by a mounting bracket provided at the front end of each front side member.
[0003]
By the way, in such a front body structure of an automobile, a front side member and a bumper reinforce are arranged in a state where the front side member and the bumper reinforce are offset in the vehicle body vertical direction, for example, as disclosed in Patent Document 1. In this case, the mounting bracket is joined to a bumper reinforce through a bumper staking portion extending in the front and rear direction of the vehicle body, and includes a front support leg and a rear support leg divided in the lower vehicle front and rear direction. It is joined to the front end of the front side member via the mounting portion.
[0004]
[Patent Document 1]
JP-A-7-267021 (FIG. 1)
[0005]
[Problems to be solved by the invention]
In the front vehicle body structure, the mounting portion of the mounting bracket joined to the front side member supports a moment acting rearward on the vehicle body with the mounting portion as a fulcrum due to a load applied from the front of the vehicle body. Therefore, it is configured to have a wide span between the front support leg and the rear support leg. Therefore, when the load of the load is small, the energy corresponding to the load is deformed while approaching between the front support leg and the rear support leg of the mounting portion as the bump pasty portion of the mounting bracket buckles. The mounting bracket does not affect the buckling of the bump pasty portion, so that the mounting bracket is substantially uniformly compressed and deformed over the entire area.
[0006]
However, when the load is large, the energy corresponding to the load is transmitted shortly after the bumper stay portion of the mounting bracket buckles and the front support leg and the rear support leg of the mounting portion approach each other. As a result, the front side member may be bent in a side view, and the energy absorption efficiency according to the load may be reduced.
[0007]
Therefore, the present invention has been made in view of such a conventional problem, and substantially improves the energy absorption efficiency of the load by substantially uniformly compressively deforming the vehicle in the front-rear direction according to the load applied from the front of the vehicle. It is an object of the present invention to provide a front body structure of an automobile that can be used.
[0008]
[Means for Solving the Problems]
According to the present invention, a front side member extending in the vehicle longitudinal direction on both sides in the vehicle width direction, and a bumper reinforce coupled to a front side of the front side member via a coupling member and extending in the vehicle width direction In the front body structure of the vehicle, which is offset in the vehicle vertical direction, the front side member connecting member disposed in the vehicle width direction in front of the front side member and spaced apart from the bumper reinforce in the vehicle vertical direction. An upper and lower connecting portion provided on the vehicle body front side and connected to the bumper reinforce and the front side member connecting member, respectively; and a connecting member provided on the vehicle rear side and connected to the front end of the front side member. And a rear joint.
[0009]
【The invention's effect】
According to the present invention, a front side member connecting member is provided in the vehicle width direction in front of the front side member so as to be spaced apart from the bumper reinforce in the vehicle vertical direction, and the connecting member is provided on the vehicle front side. The vehicle body has upper and lower coupling portions respectively coupled to the reinforcement and the front side member coupling member, and a rear coupling portion provided on the rear side of the vehicle body and coupled to the front end portion of the front side member. When a load is applied from the front, the load is input to the bumper reinforce and the front side member connecting member, respectively, and then dispersed to the upper surface side and the lower surface side of the front side member via the connecting member, and Since the front side member is transmitted rearward, the front side member can be substantially uniformly compressed and deformed, thereby causing axial crush. Thus, it is possible to provide a front body structure of an automobile that can significantly improve the efficiency of absorbing energy due to a load.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0011]
1 to 3 show an embodiment of a front body structure of an automobile according to the present invention, FIG. 1 is a partial cross-sectional view showing a schematic configuration of the front body structure, and FIG. FIG. 3 is a perspective view showing an enlarged main part of the vehicle body shown in FIG. 1.
[0012]
1 and 2, reference numeral 1 denotes a pair of front side members extending in the front-rear direction on both sides in the vehicle body width direction, and is disposed between the front ends of the front side members 1 so as to straddle them. The bumper reinforce 2 is coupled via a mounting bracket 3 as a coupling member, and the front side member 1 and the bumper reinforce 2 constitute a skeleton of a front portion of the vehicle body. In this case, the front side member 1 and the bumper reinforce 2 are arranged in a positional relationship offset in the vehicle body vertical direction.
[0013]
Below the front side member 1, a sub-frame 4 is disposed in the vehicle longitudinal direction substantially along the front side member 1. The sub-frame 4 is a pair of left and right along the front side member 1. The upper surface is formed by a frame main body portion 4a, a front connecting portion (not shown) connected between the front portions of the pair of frame main portions 4a, and a rear connecting portion (not shown) connected between the rear portions. It is formed in a double-girder shape visually.
[0014]
Further, each frame body portion 4a is connected to the front end of the front side member 1 by forming a connecting portion 5 at each frame body portion 4a and the front end of the front side member 1.
[0015]
The fixed portion 7 for fixing the connecting pin 6 for connecting the front side member 1 and the sub-frame 4 disposed inside the fixed portion 5 in the vertical direction of the vehicle body includes a front end portion of the sub-frame 4. And an upper flange portion 8 extending upward from the fixed holding portion 7 is joined to the lower surface 1 a of the front side member 1.
[0016]
Incidentally, the connection pin 6 is fixedly held to the fixed holding portion 7 by welding a circular flange portion 6a provided at a substantially intermediate portion thereof, and a male screw is provided below the flange portion 6a. The connection pin 6 is fitted into a fitting hole 9 provided at a front end portion of the frame main body portion 4a of the sub-frame 4 with a bush 10 interposed therebetween, thereby connecting the sub-frame 4 to the front end portion of the front side member 1. It is connected to the lower surface 1a.
[0017]
In addition to the above configuration, a front side member connecting member is provided below the bumper reinforce 2 in the vehicle width direction substantially apart from the bumper reinforce 2 in the vehicle vertical direction and substantially along the bumper reinforce 2. A connecting member 11 is provided, and the connecting member 11 is connected to a front end portion of the front side member 1 via a mounting bracket 3.
[0018]
As shown in detail in FIG. 3, the mounting bracket 3 has a bumper reinforce 2 and a connecting member 11 on the front side of the vehicle body and upper and lower connecting portions 3a and 3b respectively connected thereto, and a front side on the rear side of the vehicle body. It has a rear connecting portion 3c connected to the front end of the member 1. The mounting bracket 3 is formed in, for example, a substantially V-shape in a side view as shown in FIG. 1 so that the bumper reinforce 2 and the connecting member 11 are respectively connected to the upper surface 1b of the front side member 1 and The lower surface 1a is disposed so as to be overlapped with the lower surface 1a in the vehicle vertical direction.
[0019]
Incidentally, reference numeral 12 in FIG. 1 indicates a front bumper disposed in the vehicle width direction in front of the vehicle body, and reference numeral 13 indicates a hood disposed in the front-rear direction in front of the vehicle body and covering an engine room (not shown).
[0020]
As described above, in the front body structure, the connecting member 11 is provided in the vehicle width direction in front of the front side member 1 and is separated from the bumper reinforce 2 in the vehicle vertical direction, and the mounting bracket 3 is provided on the vehicle front side. Upper and lower connecting portions 3a and 3b respectively connected to the bumper reinforce 2 and the connecting member 11, and a rear connecting portion 3c provided on the rear side of the vehicle body and connected to the front end of the front side member 1. With this configuration, even when the front side member 1 and the bumper reinforce 2 have a positional relationship offset in the vehicle body vertical direction, when a load is applied from the front of the vehicle body, the load is applied to the bumper reinforce 2. And the connecting member 11 respectively. As a result, the rear side of the vehicle The moment due to the load of the bumper reinforcement 2 side acts, can be canceled by the moment due to the load of the connecting member 11 side acting from below across the axis of the front side member 1.
[0021]
Therefore, the load from the front of the vehicle body can be distributed to the upper surface 1b side and the lower surface 1b side of the front side member 1 via the mounting bracket 3 and transmitted to the rear of the vehicle body. And can be axially crushed. Thus, the energy absorption efficiency of the load can be significantly improved.
[0022]
Further, in this front body structure, the bumper reinforce 2 and the connecting member 11 are arranged by the mounting bracket 3 at positions where the bumper reinforces the upper surface 1b and the lower surface 1a of the front side member 1 in the vehicle vertical direction. With this arrangement, a load is applied from the front of the vehicle body, and when these loads are transmitted from the bumper reinforce 2 and the connecting member 11 to the front side member 1 via the mounting bracket 3, these bumper reinforces are applied. Since the force 2 and the connecting member 11 wrap in the vertical direction of the vehicle body on the upper surface 1b side and the lower surface 1a side of the front side member 1, respectively, it is possible to further improve the transmission efficiency of the load from the front of the vehicle body. it can.
[0023]
In addition, in this case, since the bumper reinforce 2 and the connecting member 11 are arranged in a vertical positional relationship with respect to the center of the front side member 1 in the vertical direction of the vehicle body, the front side member 1 and the bumper Since the apparent centroids of the reinforcement 2 and the connecting member 11 can be matched with each other, it is possible to prevent local twisting, bending, and the like from occurring on the front side member 1 and improve the rigidity of the vehicle body. be able to.
[0024]
Although the front body structure of the vehicle according to the present invention has been described by taking the above-described embodiment as an example, the present invention is not limited to this, and various embodiments are adopted without departing from the gist of the present invention. be able to.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a schematic configuration of a front body structure of an automobile according to an embodiment of the present invention.
FIG. 2 is a perspective view of a front body structure of the automobile shown in FIG.
FIG. 3 is an enlarged perspective view showing a main part of a front body structure of the automobile in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Front side member 1a ... Lower surface 1b ... Upper surface 2 ... Bumper reinforcement 3 ... Mounting bracket (joining member)
3a ... upper connecting part 3b ... lower connecting part 3c ... rear connecting part 4 ... subframe 11 ... connecting member (front side member connecting member)

Claims (2)

A front side member extending in the vehicle longitudinal direction on both sides in the vehicle width direction, and a bumper reinforce, which is coupled to a front side of the front side member via a coupling member and extends in the vehicle width direction, extends in the vehicle vertical direction. In the front body structure of the car that is offset,
A front side member connecting member disposed in the vehicle width direction in front of the front side member and spaced apart in the vehicle vertical direction from the bumper reinforce;
The coupling member is
Upper and lower connecting portions provided on the vehicle body front side and respectively connected to the bumper reinforce and the front side member connecting member;
A front vehicle body structure for an automobile, comprising: a rear coupling portion provided on a rear side of the vehicle body and coupled to a front end of the front side member. 2. The vehicle according to claim 1, wherein the bumper reinforce and the front side member connecting member are disposed on upper and lower sides of the front side member so as to wrap in a vehicle vertical direction. The front body structure of the vehicle as described.

Images