JPH08207830A - Vehicular body structure - Google Patents

Abstract

PURPOSE: To improve energy absorbing characteristics by excellently buckling and deforming a whole side member when an outside load is inputted to the side member. CONSTITUTION: In body structure in which a spring support body 3 to support one end of a suspension mechanism is fixed on the way of a longitudinal direction of a side member 1, a vulnerable part 5 is arranged in the vicinity of the mounting part of the spring support body 3 in the side member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure, and more particularly to a spring for supporting one end of a suspension mechanism midway in the longitudinal direction of side members extending in the front-rear direction on both sides of the vehicle in the vehicle width direction. The present invention relates to a vehicle body structure to which a support body is fixed.

[0002]

2. Description of the Related Art Conventionally, as this type of body structure, for example, one described in Japanese Utility Model Laid-Open No. 64-22686 is known. In this body structure, as shown in FIG. 4, the lower side of the spring support body C assembled to the wheel housing B is fixed to the middle of the side member A extending in the vehicle front-rear direction in the longitudinal direction. One end side of a suspension mechanism (not shown) that elastically supports the wheel is attached through a mounting hole C1 provided on the upper side of the spring support body C.

Further, the side member A has an upper member A5 integrally assembled with the member main body A1 on the upper side thereof so as to extend continuously with the member main body A1. More specifically, the member body A1 of the side member A has a bottom wall A2.
And a pair of side walls A3 and A3 which are erected oppositely from the left and right sides of the bottom wall A2 to have a rectangular cross section, and the upper member A5 includes the bottom wall A6 and the left and right sides of the bottom wall A6. A pair of side walls A7 and A7 standing upright from both sides is formed into a rectangular cross section, and the upper member A5 is inserted into the upper side of the opening of the member body A1 to form the side walls A3 and A7. Are fixed to each other by welding means.

Further, the spring support body C is
In order to support the suspension mechanism, a thick plate is formed to have a large rigidity, and a side wall A3 on one side of the member main body A1 is applied to the side surface of the spring support body C so as to fix them by welding means. ing.

[0005]

In the body structure described above, when an external load is applied to the side member A from one side in the longitudinal direction, the side member A is buckled and deformed as a whole. It is desirable to absorb energy.

However, in the above-mentioned conventional structure, the side member A is fixed to the side surface of the spring support body C having a large rigidity, and the member main body A1 and the upper member A5 constituting the side member A are formed. Each side wall A
3, 3 and 7 are integrally connected to each other, and the mounting portion of the spring support C in the side member A is locally made to have high rigidity. Therefore, when an external load is input to the side member A, It is conceivable that the side member A will be in a center-folded state around the mounting portion of the spring support C that is locally made to have a high rigidity without causing the buckling deformation of the entire side member.
Therefore, the energy absorption characteristics when an external load is input cannot be said to be sufficient.

An object of the present invention is to allow the side member as a whole to favorably buckle and deform when an external load is applied to the side member to enhance the energy absorption characteristics.

[0008]

In order to achieve the above object, the present invention provides one end of a suspension mechanism at a midpoint in the longitudinal direction of a side member 1 which is disposed on both sides of a vehicle in the vehicle width direction and extends in the front-rear direction. In the body structure of the vehicle, in which the spring support body 3 that supports the spring support body 3 is fixed, the fragile portion 5 is provided in the side member 1 near the attachment portion of the spring support body 3.

[0009]

According to the above construction, when an external load is applied to the side member 1 from one side in the length direction, the side member 1 is formed even if the spring support body 3 is formed to have a large rigidity. In the vicinity of the attachment of the spring support body 3 in the above, a fragile portion 5 is provided, and the fragile portion 5 weakens the rigidity of the attachment vicinity, so that the side member 1 is buckled and deformed satisfactorily as a whole. Therefore, the energy absorption characteristics when an external load is input to the side member 1 can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of FIG. 1 shows a body structure on the front side of a vehicle, which is basically the same as the above-mentioned conventional one, and the side member 1 is longitudinally intermediate. The lower side of the spring support body 3 assembled to the wheel housing 2 is fixed to the portion.

The side member 1 is provided with a member main body 11 and an upper member 15. The member main body 11 includes a bottom wall 12 and a pair of left and right side walls 13 and 14 which stand upright from both left and right sides of the bottom wall 12. The upper member 15 has a rectangular cross section, and the upper member 15 is formed in a rectangular cross section by a bottom wall 16 and a pair of left and right side walls 17 and 18 which are erected oppositely from the left and right sides of the bottom wall 16. The upper member 15 is inserted into the upper side of the opening of the member main body 11 so that each side wall 1
3, 14 and 17, 18 are fixed to each other at a plurality of positions in the longitudinal direction by welding means.

As shown in FIG. 2, the spring support body 3 has a flat wall 31 located on the top side of the wheel housing 2, and a downward direction along the side wall of the wheel housing 2 from the wall 31. And an extended side wall 32,
The lower side of the side wall 32 is applied to the side wall 13 on the left side of the member main body 11, and the both are fixed by welding. In addition, the spring support body 3 supports the walls 3 in order to support a suspension mechanism 4 described later.
The whole of 1, 32 is formed thick to have high rigidity.

Further, a suspension mechanism 4 for elastically supporting the wheels is attached to the spring support body 3. As the suspension mechanism 4, in the embodiment shown in FIG. A straddle type having a piston rod 42 inserted as much as possible and a suspension spring 43 interposed therebetween is used to elastically support the wheel on the lower side of the cylinder 41, and the piston rod 42 The upper side of the spring support body 3 is inserted into the mounting hole 30 provided in the plane wall 31 of the spring support body 3, and the insertion end side is fixedly supported by the fixture 44.

In the above body structure, when an external load is applied to the side member 1 near the mounting portion of the spring support body 3 of the side member 1, the side member 1 is entirely buckled. The fragile portion 5 is formed to be deformed to enhance the energy absorption characteristic.

In forming the fragile portion 5, for example, as shown in each of the embodiments of the drawings, the upper member 15 facing the mounting vicinity of the spring support body 3 in the member main body 11 is opposed to the mounting vicinity. The bottom wall 16 and the left side wall 17 provided on the upper member 15 are respectively provided at the middle portion in the longitudinal direction of the spring support body 3
Is curved in an arc shape toward the side wall 18 on the right side provided on the upper member 15 so as to be separated from the left side wall 13 of the member main body 11 on which the curved portion 51 and the spring support body are attached. A blank area 52 is provided between the left side wall 13 and the left side wall 13 to which the blank area 5 is attached.
By forming 2, the rigidity of the member main body 11 is lowered, and accordingly, when an external load is input to the side member 1, the side member 1 is entirely buckled and deformed.

In the case of the above configuration, when an external load is applied to the side member 1 from the front side, for example, the fragile portion 5 provided in the vicinity of the mounting of the spring support body 3 on the side member 1 The side member 1 can be favorably buckled and deformed in the front-rear direction as a whole to enhance energy absorption characteristics.

Further, as the fragile portion 5, as described above,
When forming the blank area 52 in the vicinity of the attachment of the spring support body 3 in the upper member 15, when the side member 1 and the spring support body 3 are fixed to each other by welding means, even if the member body 11 and the upper member are fixed to each other. 1
Even when using the side member 1 manufactured in another work site in which 5 and 5 are integrally assembled in advance, the spot welding gun G is inserted into the inside by using the blank area 52 as shown in FIG. By spot welding the side wall 13 of the member main body 11 and the side wall 32 of the spring support body 3 with this welding gun G, the support body 3 and the side member 1 can be fixed to each other, and thus workability can be improved. it can.

That is, when the blank area 52 is not provided, the welding gun is inserted from the upper opening side of the member main body 11 with the upper member 15 removed, and the side wall 13 and the spring support body 3 are inserted. While it is necessary to weld the side wall 32 of the member and then the upper member 15 and the member main body 11 to each other, when the blank area 52 is provided, as described above, the member main body 11 and the upper member 15 are welded. Therefore, the side member 1 manufactured in another work site, which is preliminarily integrated with 15 can be used, and workability can be improved.

When forming the fragile portion 5, the lower portion of the side wall 13 of the member main body 11 is cut out in the vicinity of the mounting of the spring support body 2, and the rigidity of the member main body 11 is reduced by the cutout portion. The weakened portion 5 can be used. Further, although the front side body structure has been described in the embodiments of each drawing, the present invention can be applied to the rear side body structure.

[0020]

As described above, according to the present invention,
When an external load is input to the side member 1 from one side in the length direction, even if the spring support body 3 is formed to have a large rigidity, it is provided in the vicinity of the attachment of the spring support body 3 in the side member 1. Since the weak portion 5 can weaken the rigidity of the side member 1 in the vicinity of the mounting, the side member 1 can be buckled and deformed satisfactorily as a whole. Therefore, an external load is applied to the side member 1. The energy absorption characteristics when input can be enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a body structure of a vehicle according to the present invention.

FIG. 2 is a vertical cross-sectional view of the main part.

FIG. 3 is a vertical cross-sectional view of a main part showing a step of welding a spring support body to a side member.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 ... Side member 3 ... Spring support body 5 ... Weakened part

Claims (1)

[Claims] 1. A vehicle in which a spring support body (3) for supporting one end of a suspension mechanism is fixed midway in the length direction of side members (1) extending in the front-rear direction arranged on both sides of the vehicle in the vehicle width direction. A body structure for a vehicle, characterized in that a fragile portion (5) is provided in the side member (1) in the vicinity of a mounting portion of the spring support body (3).