JPH11348831A - Crossmember structure in body frame of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the strength of the connecting part between a base member and a body member which are incorporated in a cross member while maintaining the facility of the assembling of a vehicle body frame. SOLUTION: A cross member 3 is incorporated with a base member 7 projected from each of side members 2, and a body member 8 having both end parts connected to the base members 7. Upper and lower members 10 to 13 are connected to the base members 7 and the body member 8, respectively. The lower member 11 is projected toward the center 5 from the upper member 10 of the base members 7 while the upper member 12 in the end part of the body member 8 is projected from the lower end 13 thereof. The upper member 12 of the body member 8 is set on the upper surface of the upper member 12 of the base members 7, and is connected thereto, and the lower member 13 of the body member 8 is set on the upper surface of the lower member 11 of the base members 7 and is connected thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross member structure of an automobile body frame having a base member having a cross member protruding from each of left and right side frames, and a main body member mounted on the base member.

[0002]

2. Description of the Related Art Generally, a body frame of an automobile is constructed by a pair of left and right side frames extending in the front-rear direction and constituting the respective side portions in the vehicle width direction, and extending over the both side frames extending in the vehicle width direction. And a cross member for connecting these two side frames to each other (actually open flat 3-82).
No. 280).

Further, in the above configuration, conventionally, FIGS.
The one denoted by 0 has been proposed.

[0004] Referring to the drawings, reference numeral 1 indicates a body frame of an automobile, and an arrow Fr indicates the front of the automobile.

The vehicle body frame 1 includes a pair of left and right sheet metal side frames 2 extending in the front-rear direction and constituting the respective side portions in the vehicle width direction, and extending over the left and right side frames 2 extending in the vehicle width direction. A cross member 3 made of sheet metal for connecting the two side frames 2 to each other; a radiator support 4 is supported at the front end of each side frame 2; I have.

The body frame 1 is substantially symmetrical with respect to the center 5 of the side frames 2. The cross member 3 is connected to each of the side frames 2 by spot welding (indicated by “x”) S, and projects from the side frames 2 toward the center 5, and the left and right base members 7, 7. A main body member 8 is disposed between the base members 7 and extends in the vehicle width direction, and each end of the main body member 8 is connected to each of the base members 7. Each of the base members 7 is connected to each other by spot welding S, and further includes lower members 10 and 11, and the main body member 8 is also connected to each other by spot welding S, and the lower members 12, 11 are connected to each other. 13 is provided.

In the above case, the upper member 12 at the end of the main body member 8 is projected more toward the side frame 2 side than the lower member 13, and the upper body 10 is attached to the upper surface of the upper member 10 of the base member 7. Upper member 12 of member 8
Are mounted and joined by spot welding S.

When assembling the vehicle body frame 1 having the above structure, first, the upper and lower base members 7 projecting from the left and right side frames 2 are provided on the upper surface of the upper member 10 and the respective ends of the main body member 8 from above. The upper member 12 is placed. Next, the upper members 10 and 12 are spot-welded S to each other, and the main body members 8 are attached to the base members 7.
, And the above assembly is performed.

That is, according to the above structure, the assembly work of the vehicle body frame 1 is facilitated by the simple work of simply placing each end of the main body member 8 on each base member 7 from above and connecting them. It can be done.

[0010]

According to the above prior art, the lower member 11 of the base member 7 and the lower member 13 of the main body member 8 are mutually moved upward and downward during the assembly. To prevent interference, the lower member 11 of the base member 7 and the lower member 13 of the main body member 8 are separated from each other in the vehicle width direction, and a gap 15 is formed.

Therefore, in the cross member 3, at a part of the joint between the base member 7 and the main body member 8 corresponding to the gap 15, the section modulus is sharply reduced, and stress concentration may occur there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and the present invention has been made in consideration of the above-described circumstances. It is an object to further improve the strength.

[0013]

The cross member structure of the vehicle body frame according to the present invention for solving the above-mentioned problems is as follows.
It is as follows.

According to the first aspect of the present invention, the left and right side frames 2 are provided.
A cross member 3 is provided between the left and right base members 7, 7 and protrudes from the side frames 2 toward the center 5 of the side frames 2. A main body member 8 extending in the direction and having each end coupled to the base member 7. The base member 7 and the main body member 8 are coupled to each other, and the lower members 10 to 13 are provided. Car body frame

The lower member 11 is made to protrude toward the center 5 side from the upper member 10 of the base member 7, while the upper member 12 at the end of the main body member 8 is made to extend to the side frame more than the lower member 13. 2, the upper member 12 of the main body member 8 is provided on the upper surface of the upper member 10 of the base member 7, and the lower member 13 of the main body member 8 is provided on the upper surface of the lower member 11 of the base member 7.
Are mounted on each other and combined.

According to a second aspect of the present invention, in addition to the first aspect, the upper and lower members 10 to 13 each have a substantially U-shaped cross section, and the upper members 10 and
12 and the lower members 11 and 13 are fitted to each other.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention.

Since this embodiment has the same basic configuration as that of the conventional technique, the same reference numerals as those in FIGS. 8 to 10 are attached to the respective drawings, and the duplicated description is omitted.

Each of the upper and lower members 10 to 13 is formed by press forming, and its section in the vehicle width direction (longitudinal direction) has an inverted U-shaped shape. More specifically, the upper and lower members 10 to 13
A pair of front and rear side plates 17, 17 facing each other at a distance in the front-rear direction, a connecting plate 18 for integrally connecting upper end edges of these both side plates 17, 17, and a lower end edge of each side plate 17 are integrally formed. Outward flange 19,1 formed
9 and has sufficient strength and rigidity as compared with a member having a simple flat cross section.

In the above configuration, the left and right side frames 2
A cross member 3 is provided between the left and right base members 7, 7 and protrudes from the side frames 2 toward the center 5 of the side frames 2. A main body member 8 extending in the direction and each end thereof being connected to each of the base members 7. The base members 7 and the main body member 8 are connected to each other, and the lower members 10 to 13 are connected to each other. Have.

The lower member 11 of the base member 7 is made to protrude toward the center 5 from the upper member 10, while the upper member 12 at the end of the main body member 8 is made of the side member more than the lower member 13. The upper member 12 protrudes toward the frame 2, and the upper member 12 of the main body member 8 is provided on the upper surface of the upper member 10 of the base member 7, and the lower member 13 of the main body member 8 is provided on the upper surface of the lower member 11 of the base member 7. Are mounted and coupled.

When assembling the vehicle body frame 1 having the above-described structure, first, the upper end of the left and right base members 7 projecting from the left and right side frames 2 is placed on the upper surface of the upper member 10. The upper member 12 is placed, and on the upper surface of the lower member 11 of the base member 7,
From above, the lower member 13 at each end of the body member 8
Is placed. Next, the upper members 10 and 12 and the lower members 11 and 13 are spot-welded S to each other to connect the respective ends of the main body member 8 to the base members 7 and to perform the assembling. It is supposed to be.

That is, according to the above configuration, the assembly work of the vehicle body frame 1 is facilitated by the simple work of simply placing the respective end portions of the main body member 8 on the respective base members 7 from above and connecting them. It can be done.

According to the above configuration, the base member 7
Since the upper and lower members 10 and 11 and the upper and lower members 12 and 13 of the main body member 8 are connected to each other, compared with the conventional technology in which the lower members 11 and 13 are not connected to each other, The base member 7 and the main body member 8
The stress concentration is prevented from being generated in a part of the joint portion with the slab.

Therefore, the strength of the joint between the base member 7 and the main body member 8 of the cross member 3 is further improved while the assembling work of the body frame 1 can be easily performed.

In the above case, each of the upper and lower members 1
The cross-sections of 0 to 13 are each substantially U-shaped, and upper members 10 and 12 and lower members 11 and 13 that are connected to each other are fitted to each other. More specifically, the upper member 10 of the base member 7
The upper member 12 of the main body member 8 is externally fitted to the lower member 11 from above, and the lower member 13 of the main body member 8 is externally fitted to the lower member 11 of the base member 7 from above. Side plates 17, 17 and connecting plate 1
The surfaces 8 and 18 are surface-joined to each other, and are connected to each other by spot welding S.

According to the above arrangement, each of the upper and lower members 10
Since each of the members 13 has a U-shape having high strength and rigidity, the strength of the joint between the base member 7 and the main body member 8 is further improved.

In addition, when assembling the body frame 1, the upper members 10, 12 and the lower members 11, 13 are fitted to each other. Since the positioning of the lower members 11 and 13 can be performed easily and accurately, there is also an advantage that the assembling work can be more easily performed.

Further, as described above, the base member 7 and the main body member 8 are formed by the upper joined body of the upper members 10 and 12 fitted to each other and the lower joined body of the lower members 11 and 13 fitted to each other. The cross section of the joint is a closed box.

Therefore, the base member 7 and the main body member 8
The strength of the joint is further improved.

Although the above description is based on the illustrated example, the cross section of each of the upper and lower members 10 to 13 may be an erect, substantially U-shaped.

[0033]

The effects of the present invention are as follows.

According to the first aspect of the present invention, a cross member bridged between the left and right side frames is provided between a base member protruding from each of the side frames toward the center of the both side frames, and between the left and right base members. And a body member extending in the vehicle width direction and having each end coupled to the base member. The base member and the body member are coupled to each other, and the vehicle includes a lower member. In the body frame,

The lower member is made to project more toward the center than the upper member of the base member, and the upper member at the end of the body member is made to project more toward the side frame than the lower member. The upper member of the main body member is mounted on the upper surface of the upper member of the base member, and the lower member of the main body member is mounted on the upper surface of the lower member of the base member.

That is, when assembling the vehicle body frame having the above-described structure, first, the upper members of the ends of the main body member are placed on the upper surfaces of the upper members of the left and right base members, which are previously projected from the left and right side frames. Put on, and
A lower member at each end of the main body member is placed on the upper surface of the lower member of the base member from above. Next, the upper members and the lower members are spot-welded to each other, and the respective ends of the main body member are joined to the respective base members, whereby the assembling is performed.

That is, according to the above construction, the assembly work of the vehicle body frame can be easily performed by a simple operation of simply placing each end portion of the main body member on each base member from above and connecting them. Have been.

According to the above configuration, since the upper and lower members of the base member and the upper and lower members of the main body member are connected to each other, the prior art in which the lower members are not connected to each other is used. In comparison, the occurrence of stress concentration at a part of the joint between the base member and the main body member is prevented.

Accordingly, the strength of the joint between the base member and the main body member of the cross member can be further improved while the assembling work of the vehicle body frame can be easily performed.

According to a second aspect of the present invention, the cross section of each of the upper and lower members is substantially U-shaped, and the upper members and the lower members to be connected to each other are fitted to each other.

For this reason, since the upper and lower members each have a U-shape having high strength and rigidity, the strength of the joint between the base member and the main body member is further improved.

In addition, when assembling the body frame, the upper members and the lower members are fitted to each other, so that the mutual positioning of the upper members and the lower members is simple and easy. There is also an advantage that the above assembling work can be made easier because it can be done accurately.

[Brief description of the drawings]

FIG. 1 is a front view of one side of a vehicle body frame.

FIG. 2 is an expanded partial sectional view of FIG.

FIG. 3 is a perspective view of what is shown in FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 1;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 1;

FIG. 7 is a sectional view taken along line 7-7 in FIG. 1;

FIG. 8 is a diagram corresponding to FIG. 1 in a conventional technique.

FIG. 9 is a diagram corresponding to FIG. 2 in a conventional technique.

FIG. 10 is a diagram corresponding to FIG. 3 in a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Side frame 3 Cross member 5 Center 7 Base member 8 Body member 10 Upper member 11 Lower member 12 Upper member 13 Lower member S Spot welding

Claims (2)

[Claims] 1. A cross member bridged between left and right side frames, a base member projecting from each of the side frames toward the center of the side frames, and a cross member disposed between the left and right base members and having a vehicle width. A body member extending in the direction of the vehicle body, the ends of which are coupled to the base members. The base member and the body member are coupled to each other, and the vehicle body frame includes a lower member. The lower member is made to project more toward the center than the upper member of the base member, while the upper member at the end of the body member is made to project more toward the side frame than the lower member, and The upper member of the main body member is on the upper surface of the upper member, and the lower member of the main body member is on the upper surface of the lower member of the base member. Cross member structure of an automobile body frame that was bound by mounted. 2. The vehicle body frame according to claim 1, wherein each of the upper and lower members has a substantially U-shaped cross section, and the upper member and the lower member that are connected to each other are fitted to each other. Cross member structure.