JPH0365475A - Structure for coupling vehicle side member - Google Patents

Abstract

PURPOSE:To sufficiently absorb impact by a side member by a method wherein an end of at least one of a front and rear members on the overlapped part of both members is tilted in a widthwise direction of a body. CONSTITUTION:On an overlapped part 12 of a front and a rear members 3, 4 constituting a rear side member 2, an end of at least one of these members 3, 4 is tilted with respect to the widthwise direction of the vehicle. Thus rigidity on a part from a mediate part to the overlapped part 12 of the front and rear members 3, 4 varies more gently than a case where the overlapped part 12 is aligned to the widthwise direction of the vehicle. Therefore, when impact is applied from the rear end of the rear side member 2 toward the front, concentration of stress in the vicinity 13 of the overlapped part 12 of the front and rear members 3, 4 is suppressed thereby preventing the end of the rear side member 2 from being bent easily with the vicinity 13 as the center.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention provides a method for connecting a side member of a vehicle body to a front member and a rear member separate from the front member. Regarding structure.

(Prior Art) Conventionally, for example, there are those shown in FIGS. 5 to 7 as side members of automobiles.

To explain this according to the drawings, 21 is a rear side member, and arrow Fr in FIG. 5 indicates the front of the vehicle body.

The rear side member 21 has a front member 22 connected to the front side member side, and this front member 22 is separate.
It is comprised of a rear member 23 located behind this front member 22.

The lower surface side of the front end of the rear member 23 is overlapped with the upper surface side of the rear end of the front member 22, and the front and rear members 22 and 23 are firmly connected to each other by welding at this overlapping portion 24.

(Problems to be Solved by the Invention) According to the above-mentioned conventional configuration, the rigidity of the portion 23a of the rear member 23 near the overlapped portion 24 is extremely small compared to the rigidity of the overlapped portion 24. There is.

Therefore, when an impact F is applied forward from the rear end side of the rear side member 21, such as in the event of a collision, stress is concentrated in the vicinity portion 23a, and the rear end side of the rear member 23 is moved around this portion. There is a risk that it may bend easily.

When such a simple bending occurs, the amount of plastic deformation of the rear end side of the rear side member 21 due to the collision is reduced accordingly, which is disadvantageous in that the amount of impact energy absorbed is reduced.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and consists of a front or rear side member consisting of a front member and a rear member, and opposing ends of these front and rear members are connected to each other. In the case where the side members are overlapped and connected, when an impact is received from one end of the side member in the longitudinal direction, the side member tends to easily bend around a portion near the overlapping portion. It is an object of the present invention to prevent this from occurring, and thereby to enable the side members to sufficiently absorb impact energy.

(Structure of the Invention) A feature of the present invention for achieving the above object is that at least one end face of the front and rear members is inclined with respect to the vehicle width direction in the overlapped portion of the front and rear members. , the rigidity is made to change gradually in the part where the front and rear members move from the front and back midway to the overlapping part.

(for production) The effects of the above configuration are as follows.

In the overlapping portion 12 of the front and rear members 3.4 constituting the rear side member (side member) 2, at least one end surface of these members 3.4 is inclined with respect to the vehicle width direction. There is. For this reason, the rigidity of the portion of the front and rear members 3.4 that transitions from the front-rear midway to the overlapping portion 12 is higher than that in the case where the overlapping portion 12 is aligned in the vehicle width direction as in the past. , will change gradually.

Therefore, when a shock is received from the rear end side of the rear side member (side member) 2 toward the front, the front and rear members 3.
4 is suppressed from stress concentration occurring in the vicinity portion 13 of the overlapping portion 12, that is, the end portion of the side member 2 that is not subjected to impact is
It is prevented from easily bending around 3.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 2, l is the rear body of the automobile, and arrow Fr in the figure indicates the front thereof.

The rear body 1 is of a sheet metal type, and has a pair of left and right rear side members 2, 2, each of which has a front member 3 connected to the front side member, and a separate body from the front member 3. It is comprised of a rear member 4 located behind this front member 3.

The front ends of the left and right front members 3.3 are connected to each other by a first cross member 6, and the rear ends are connected to each other by a second cross member 7, so that the left and right front members 3.3 have sufficient space. given rigidity.

The above left and right rear side members 2, 2 and each cross member 6
．． A beam floor panel 8 is attached on top of 7.

Inner plates 9 of the wheel house are attached to both sides of the front part of the rear floor panel 8, and a recess 10 for storing tires is formed at the rear of the rear floor panel 8 between the left and right rear members 4.4. There is.

In FIGS. 1, 3, and 4, the front and rear members 3 and 4 each have main body portions 3a and 4a each having a roughly U-shaped cross section and expanding upward, and each of these main body portions 3a. , 4a
The outer flanges 3b and 4b are integrally formed on the upper edge of the outer flange. The front end of the main body 4a of the rear member 4 is fitted into the rear end of the main body 3a of the front member 3 and overlapped, and the lower surface of the outer flange 4b of the rear member 4 is overlapped with the upper surface of the outer flange 3b of the front member 3. This is the overlapping portion 12. In this overlapping portion 12, the front and rear members 3.4 are spot-welded to each other at a plurality of locations, so that they are firmly connected.

In the above configuration, the rear end surface of the front member 3 and the rear end surface of the rear member 4
The front end surfaces are cut so that they are bent parallel to each other. That is, the end surfaces of the side plates of each of the main bodies 3a, 4a are both curved at the rear. In addition, the end faces of the left and right midway parts of the main body part 3a of the front member 3 when bottomed out are protruding ends 3c that protrude rearward, and the protruding ends 3c correspond to the protruding ends of the bottom plate of the main body part 4a of the rear member 4. The left and right middle portions are recessed ends 4c that are recessed toward the rear.

As a result, the overlapping portion 12 is inclined with respect to the vehicle width direction, and therefore, the rigidity of the rear member 4 at the portion transitioning from the front-rear midway to the overlapping portion 12 changes gradually. .

Therefore, when the rear side member 2 receives an impact F from the rear end side toward the front during a collision, stress concentration is suppressed from occurring in the portion 13 of the rear member 4 in the vicinity of the overlapping portion 12. The member 4 is prevented from easily bending around the vicinity portion 13 after receiving the force.

Therefore, the rear member 4 effectively plastically deforms sequentially from the rear end side toward the front, sufficiently absorbs the impact energy, and prevents the impact F from being transmitted to other parts of the vehicle body.

In addition, what is shown in Fig. 1, Fig. 3, and Fig. 4 is as follows.
It may be any one of the left and right rear side members 2, 2. Further, although the above is based on the illustrated example, the vertical positions of the front member 3 and the rear member 4 in the overlapping portion 12 may be opposite to the country side. Further, the rear end surface of the front member 3 and the front end surface of the rear member 4 may not be parallel; for example, one of these end surfaces may be aligned in the vehicle width direction, and only the other end surface may be inclined. good. Furthermore, the above embodiment may be applied to a front side member.

(Effects of the Invention) According to the present invention, at least one end face of one of the two members in the overlapping portion of the front and rear members is inclined with respect to the vehicle width direction. The stiffness at the part where the parts move to the overlapping part changes gradually.

Therefore, when an impact is received from one end of the side member in the longitudinal direction, stress concentration is suppressed in the vicinity of the overlapping portion of the front and rear members. The end portion side is prevented from easily bending around the above-mentioned neighboring portion.

As a result, the side member is effectively plastically deformed from the end side that receives the impact, so that the impact energy is sufficiently absorbed.

[Brief explanation of drawings]

1 to 4 show embodiments of the invention. Fig. 1 is a plan view of the overlapped portion, Fig. 2 is a perspective view of the rear vehicle body, Fig. 3 is a side view of the overlapped portion, Fig. 4 is a sectional view taken along the line TV-IV in Fig. 3, Figures 5 to 7 show conventional examples, Figure 5 is a plan view of the overlapping part, Figure 6 is a side view of the overlapping part, and Figure 7 is viewed from the ■-■ line arrow in Figure 6. FIG. 2. Rear side member (side member), 3. Front member, 4. Rear member, 12. Overlapping part 6 Fig. 5 22 4 3 ■→

Claims (1)

[Claims] 1. Of the front side member and rear side member,
at least one side member with the previous member,
In the connection structure of a vehicle body side member, which is composed of a rear member separate from the front member, and in which the rear end of the front member and the front end of the rear member are overlapped and connected to each other, the front and rear members are overlapped. A connecting portion structure of a vehicle body side member in which at least one end surface of both members in the section is inclined with respect to the vehicle width direction.