JPH0789463A - Terminal structure of cross member for automobile - Google Patents

Abstract

PURPOSE:To provide a terminal structure of a cross member for an automobile by which desired rigidity can be obtained without increasing weight of side sills and collision input at side impact can be efficiently transmitted to a car body. CONSTITUTION:In a terminal structure of a cross member 1 for an automobile where a main part 2 is fixed to a floor 200 and both terminals are fixed to both side sills 300, a member through-hole 304 is arranged in a sill inner 301 of the side sills 300, and a sill connecting end part 3 is extendedly arranged on an terminal of the main part 2 of the cross member 1 by passing penetratingly through the member through-hole 304 so as to reach a sill outer 302 of the side sills 300, and the sill connecting end part 3 is connected to the sill outer 302.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure of an automobile cross member which is fixed to a floor of an automobile in the width direction of the automobile.

[0002]

2. Description of the Related Art This kind of automobile cross member 100
Is fixed to the vehicle body floor 200 in the width direction of the vehicle body as shown in FIG.
It is fixedly attached to 0. That is, as shown in FIGS. 6 and 7, the cross member 100 includes a main portion 101 having a hat-shaped cross section and a flat portion 1 having the hat-shaped cross section.
01a is formed by extending the terminal portion 102, and the main portion 101 is fixed to the floor 200 by spot welding S of the flange portion 101b of the main portion 101, and is formed at the tip portion of the terminal portion 102. Fixed piece 102
The a is attached to the sill inner 301 forming the side sill 300 by spot welding S.

On the other hand, the side sill 300 is a sill inner 30
1 and a sill outer 302 are joined together by spot welding S to form a hollow member, and a sill brace 306 is mounted inside the hollow member. At this time, the sill brace 306 is the sill inner 301 and the sill brace 306.
The portion A to be joined with is fixed by plug welding. The cross member 100 attached as described above prevents the body frame from being twisted or deformed, and improves the rigidity of the body frame.

[0004]

However, in the conventional terminal structure of the cross member 100 for an automobile,
Since the terminal portion 102 is fixed to the sill inner 301, the sill brace 306 cannot be plug-welded to the sill inner 301 at the fixing portion of the terminal portion 102, and the sill brace 306 cannot be attached. For this reason,
Sill outer 30 where the sill brace 306 is not attached
The rigidity of 2 is insufficient and the collision input is not directly transmitted to the cross member 100 at the time of a side collision, or
As shown in FIG. 3, when the collision input P is input to the center pillar 400, the side sill 300 rotates in the arrow direction and is not transmitted to the cross member 100.

Therefore, in the past, in order to solve the above-mentioned problems, the plate thickness is increased to increase the rigidity of the sill outer 302 itself, but there is a problem that the weight increases.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a desired rigidity without increasing the weight of a side sill and to efficiently input a collision input at the time of a side collision to a vehicle body. It is to provide a terminal structure of a cross member for an automobile that can be transmitted.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is a terminal structure of an automobile cross member in which a main portion is fixed to a floor and both terminals thereof are fixed to both side sills. A member through hole is provided in a sill inner of the side sill, and a sill connecting end is extended to a terminal of a main portion of the cross member so as to penetrate the member through hole and reach a sill outer of the side sill. The connecting end is connected to the sill outer.

The invention according to claim 2 is the terminal structure of a cross member for an automobile according to claim 1, wherein the sill connecting end portion penetrates the member through hole, and the sill outer. A connecting portion formed so as to substantially match the inner peripheral shape is integrally formed to be formed separately from the main portion, and the connecting portion is positioned in the side sill and fixed to the inner peripheral surface of the sill outer. The end portion of the penetrating portion that penetrates the member through hole and projects to the outside of the side sill is fixed to the main portion and the floor.

[0009]

According to the first aspect of the present invention, the sill connecting end is provided at the end of the cross member and the sill connecting end is directly connected to the sill outer through the sill inner as described above. The sill outer at the connecting point is reinforced to obtain the desired rigidity as a side sill, and the collision input at the time of a side collision can be efficiently transmitted to the vehicle body through the cross member, and the collision input at the time of a side collision. Can prevent the side sill from rotating when it is input to the center pillar.

According to the second aspect of the invention, in addition to the above-mentioned action, a sill connecting end is provided with a connecting portion formed so as to substantially match the inner peripheral shape of the sill outer, and the connecting portion is provided inside the sill outer. Since it is fixed to the peripheral surface, the rigidity of the sill outer can be further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the illustrated embodiments.

FIG. 1 and FIG. 2 show the terminal structure of an automobile cross member as an embodiment. In the terminal structure of this cross member, the cross member 1 is formed to have a main portion 2 having a hat-shaped cross section and a sill connecting end portion 3 formed by extending the end of the main portion 2. The sill connecting end portion 3 has arcuate fixing flange portions 31 formed on both side walls of the tip end portion.

On the other hand, in the side sill 300 to which the sill connecting end 3 of the cross member 1 is fixed, the sill inner 301 and the sill outer 302 are combined as in the conventional case, and
The mating portion 303 is spot-welded and joined to form a hollow member, and a sill brace (not shown) is mounted in the hollow portion to maintain appropriate rigidity. The sill inner 301 of the side sill 300 is provided with a member through hole 304 through which the sill connecting end 3 of the cross member 1 penetrates. The side sill 300 thus formed is fixed to the floor 200 by spot welding S at the mating portion 305 between the floor 200 and the sill inner 301 (see FIG. 2). The cross member 1 fixes the flange portions 21 formed at the lower end portions of both side walls of the main portion 2 to the floor 200 by spot welding S and fixes the sill connecting end portion 3 through the member through hole 304. Position it inside the side sill 300, and the fixing flange portion 31 of the sill outer 302
It is fixedly attached to the sill outer 302 by being brought into contact with the inner peripheral surface of the above and spot welded.

In such a terminal structure for an automobile cross member, since the sill connecting end 3 of the cross member 1 is directly connected to the sill outer 302 by penetrating the sill inner 301, this connecting portion is reinforced without a sill brace. As a result, the desired rigidity of the side sill 300 can be obtained, and the cross-sectional deformation of the side sill 300 can be suppressed.
Further, in this case, the sill connecting end 3 is directly connected to the sill outer 30.
Since it is fixed to 2, the collision input at the time of a side collision can be efficiently transmitted to the vehicle body through the cross member 1, and the safety performance can be improved.

Furthermore, since the sill outer 302 is supported by the cross member 1 even when the collision input is input to the center pillar, the side sill 300 as shown in FIG.
Is prevented from rotating, and even in this case, the collision input can be transmitted to the vehicle body via the cross member 1.

FIGS. 3 and 4 show a terminal structure of an automobile cross member as another embodiment. In this embodiment, the cross member 10 includes a main portion 4 and a sill connecting end portion 5.
The second embodiment is different from the first embodiment in that it is formed separately, and the other structure is the same as that of the above-described embodiment. That is, the cross member 10 is formed by separately forming the main portion 4 fixed to the floor 200 and the sill connecting end portion 5 fixed to the sill outer 302, and connecting these. At this time, the main portion 4 is formed in a hat-shaped cross section, and is fixed to the floor 200 by spot welding S of the flange portions 41 at the lower end portions on both sides thereof. A bolt insertion hole 42 is formed in the flat surface portion of the terminal portion of the main portion 4 to which the sill connection end portion 5 is connected. Further, the sill connecting end portion 5 is formed by integrating a penetrating portion 51 having a hat-shaped cross section and a connecting portion 52 having a side surface shape that substantially conforms to the inner peripheral shape of the sill outer 302. The through hole 51 is formed with a weld hole 51b on its flat surface and a flange portion 51a is formed on the lower end portions of both side walls of the through hole 51. The connecting portion 52 is provided with an arc-shaped fixing flange portion 52a at its tip. Fixed pieces 52b are formed on the upper step portions, respectively.

The main portion 4 and the connecting portion 5 thus formed are attached to the vehicle body as follows.

First, the main portion 4 is fixed to the floor 200 by spot welding S on the flange portion 41 of the main portion 4, and
The sill inner 301 also has a mating portion 305 with the floor 200.
Is spot-welded S and fixed to the floor 200. On the other hand, the sill connecting end portion 5 is fixed to the sill outer 302 by spot welding S by bringing the fixing flange portion 52a and the fixing piece 52b of the connecting portion 52 into contact with the inner peripheral surface of the sill outer 302.

Next, the through portion 51 of the sill connecting end portion 5 is passed through the member through hole 304 formed in the sill inner 301 so that the tip portion is fitted into the main portion 4 and the bolt insertion hole 42 and the weld. With the holes 51b aligned, the flange portion 51a is spot-welded to the floor 2
Fixed at 00. At this time, the sill inner portion 301 and the sill outer portion 302 are joined together by spot welding S at the same time. After that, when a seat rail (not shown) is assembled to the vehicle body, the main portion 4 and the sill connecting end portion 5 are connected to each other using the weld hole 51b provided in the through portion 51.

In this embodiment, since the side surface shape of the connecting portion 52 of the sill connecting end portion 5 is formed so as to substantially match the inner peripheral shape of the sill outer 302, the connecting portion 52 is fixed to the inner peripheral surface of the sill outer 302. Sill outer 30
The rigidity of No. 2 is further improved. Further, in this embodiment, the sill connecting end portion 5 directly fixed to the sill outer 302 is used.
Since the vehicle is fixed to the main portion 4 and the floor 200, the collision input at the time of a side collision can be efficiently transmitted to the vehicle body,
The safety performance can be improved.

[0021]

As described in detail above, according to the first aspect of the invention, the end of the cross member is provided with the sill connecting end, and the sill connecting end is directly passed through the sill inner to be directly connected to the sill outer. Therefore, it is possible to reinforce this connecting portion without a sill brace, to obtain the desired rigidity as a side sill without increasing the plate thickness, and to efficiently transmit the collision input at the time of a side collision to the vehicle body. Therefore, the safety can be improved.

In addition to the effect of the invention according to claim 1, the invention according to claim 2 is provided with a connecting portion formed at the sill connecting end portion so as to substantially match the inner peripheral shape of the sill outer. Since the connecting portion is fixed to the inner peripheral surface of the sill outer, the rigidity of the sill outer can be further improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a terminal structure of an automobile cross member as an example, with a sill outer omitted.

FIG. 2 is a partial vertical cross-sectional view of the terminal structure of the automobile cross member of FIG.

FIG. 3 is an exploded perspective view of a terminal structure of an automobile cross member as another embodiment.

4 is a partial vertical cross-sectional view of a terminal structure of the automobile cross member of FIG.

FIG. 5 is a perspective view of a vehicle body showing a mounted state of a conventional automobile cross member.

FIG. 6 is a perspective view showing a terminal structure of a conventional automobile cross member.

7 is a cross-sectional view taken along the line VII-VII of FIG.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

[Explanation of symbols]

 1,10 Cross member 2,4 Main part (of cross member) 3,5 Sill connection end (of cross member) 51 Penetration part (sill connection end) 52 Connection part (sill connection end) 200 Floor 300 Side sill 301 Sill inner 302 Sill outer 304 Member through hole

Claims (2)

[Claims] 1. A terminal structure of an automobile cross member in which a main portion is fixed to a floor and both terminals thereof are fixed to both side sills, wherein a sill inner of the side sill is provided with member through holes,
At the end of the main part of the cross member, a sill connecting end is extended so as to reach the sill outer of the side sill through the member through hole, and the sill connecting end is connected to the sill outer. The terminal structure of the characteristic cross member for automobiles. 2. The terminal structure for a cross member for an automobile according to claim 1, wherein the sill connecting end portion substantially matches the inner peripheral shape of the sill outer and the through portion penetrating the member through hole. Is integrally formed with the connecting part formed in the main part, and the connecting part is positioned in the side sill and fixed to the inner peripheral surface of the sill outer, and penetrates the member through hole. A terminal structure of a cross member for an automobile, wherein an end portion of the penetrating portion protruding outward of the side sill is fixed to the main portion and the floor.