JP2004291924A - Vehicular side member reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular side member having rigidity against a torsional load applied to the side member in the state in which a vertically reverse load is applied to right and left wheels of a vehicle body. <P>SOLUTION: A sectionally U-shaped rear side member extending to the longitudinal direction of a vehicle is provided on the lower face of a front panel of the vehicle. The rear side member 4 has coil spring plates 8 arranged both on the outside face and on the lower side bottom face of the rear side member 4. The ends of the coil spring plates 8 are lapped with the end of a reinforcement 10 arranged inside the rear side member 4. In an area where the coil spring plates 8 and the reinforcement 10 lap each other, an inclined portion 11 and a parallel portion 12 are provided at the front end of the reinforcement 10. In a lapped portion L, the front end of the reinforcement 10 and an inner bottom face 6c of the rear side member 6 are located in spaced relation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle side member structure having high rigidity against a torsional load for a side member supporting a body of an automobile or the like.
[0002]
[Prior art]
FIG. 6 shows a rear side member 51 that supports the body of an automobile. The rear side member 51 has a U-shaped cross section, and extends on both left and right sides of the vehicle body and in the front-rear direction of the vehicle body. A coil spring plate 52 is fixed to the lower bottom surface 51a and the left and right side portions 51b of the rear side member 51 by welding. At the rear end side of the rear side member 51, a flat or U-shaped cross section reinforcement 53 is fixed by welding in contact with the inner bottom surface of the rear side member 51. As shown in FIG. 7, the positional relationship between the coil spring plate 52 and the reinforcement 53 is such that the rear end of the coil spring plate 52 and the front end of the reinforcement 53 overlap (wrap), and the rear side member 51. Are formed in a three-layer structure in which is disposed in the middle.
[0003]
[Patent Document 1]
JP-A-11-20744 (abstract, see FIG. 1)
[Patent Document 2]
Japanese Utility Model Registration No. 2586651 (refer to claims)
[0004]
[Problems to be solved by the invention]
FIG. 8 shows the welding points of the rear side member 51, the coil spring plate 52, and the reinforcement 53, the crosses indicate spot welds between the rear side members 51 and the coil spring plates 52, and the circles indicate the rear side members 51 and the reinforcements. It is a spot welding spot with the element 53.
On the other hand, as shown in FIG. 9, while the automobile 61 is traveling, the left and right wheels 62a, 62b may be simultaneously subjected to loads in the upside down directions a, b. Under such conditions, the rear side member 51 is pulled by a floor panel (not shown), and the U-shaped cross section is distorted as shown in FIG. In such a state, a large torsional load is applied to the spot welded portion where the coil spring plate 52 and the reinforcement 53 overlap.
[0005]
The present invention has been made in view of such circumstances, and provides a vehicle side member having a rigidity against a torsional load applied to the side member in a state where an upside-down load is applied to both left and right wheels of the vehicle body. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a vehicle side member structure according to the present invention includes a side member having a U-shaped cross section that extends in the vehicle front-rear direction and is provided on a lower surface of a floor panel, and a coil spring mounting portion is provided on the side member. A coil spring plate is disposed in contact with both outer surfaces and a lower bottom surface of the side member, and an end of the coil spring plate is disposed so as to overlap with an end of a reinforcement disposed inside the side member, At the portion where the coil spring plate and the reinforcement wrap, the front end of the reinforcement is arranged at an interval from the inner bottom surface of the side member.
In the vehicle side member structure, a contact surface between the inner bottom surface of the side member and the reinforcement is provided at a rear end side of the vehicle with respect to a wrap portion of the coil spring plate and the reinforcement panel, and On the rear side of the surface, there is provided a portion spaced apart from the inner bottom surface of the side member and the reinforcement.
The vehicle side member structure further includes a portion provided with a gap between the inner bottom surface of the side member and the coil spring plate at a front end side of the vehicle with respect to the wrap portion of the coil spring plate and the reinforcement. The front end was extended to the inner bottom surface.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a vehicle side member structure according to an embodiment of the present invention will be described with reference to the drawings. The arrow F in the figure indicates the front side of the vehicle body.
FIG. 1 is a view of a vehicle 1 employing a vehicle side member according to the present invention as viewed from below.
The vehicle 1 is provided with a pair of rear side members 4 that support the body 2 below the floor 3 of the body 2. The rear side members 4 are provided on both right and left sides of the vehicle body and extend from the front side to the rear side of the vehicle body. The rear side member 4 has a U-shaped cross section with its bottom surface facing downward, and has flanges 5a and 5b whose distal ends extend outward at upper left and right ends, and the rear side member 4 itself is fixed to the floor 3. ing.
[0008]
As shown in FIG. 2, a coil spring plate 8 is provided near the rear wheel of the rear side member 4. The coil spring plate 8 has a U-shaped cross section similarly to the rear side member 4, and has a flange 8 a having a distal end extending outward at both left and right ends.
A circular spring seat 9 of a coil spring disposed between the suspension portion and the rear side member 4 is provided at an intermediate position of the coil spring plate 8 in the front-rear direction of the vehicle. The coil spring plate 8 is fixed by spot welding so as to contact the left and right side portions 6a and the lower bottom surface 6b, which are the outer peripheral surfaces of the rear side member 4.
[0009]
A reinforcement 10 is fixed to the rear end side of the rear side member 4 by welding so as to contact the inner bottom surface of the rear side member 4. The cross section of the reinforcement 10 is a flat plate or a U-shaped cross section. The reinforcement 10 is formed along the inner surface of both sides 6 a of the rear side member 4 and abuts on the inner bottom surface 6 c (see FIG. 3). Fixed.
As shown in FIG. 3, the positional relationship between the coil spring plate 8 and the reinforcement 10 is such that the rear end of the coil spring plate 8 and the front end of the reinforcement 10 overlap and wrap with a width L (hereinafter referred to as a wrap portion L). And). More specifically, the reinforcement 10 has a rear end portion of the rear side member 4 and an abutting surface of each other, and a rear end portion of the lap portion L that is inclined upward and forward of the vehicle at a rear end portion of the lap portion L. In the wrap portion L, a parallel portion 12 is formed so as to be parallel to the surface of the rear side member 4. That is, the reinforcement 10 forms a stair-like stepped portion at the wrap portion L, and the rear side member 4 and the reinforcement 10 including the parallel portion 12 are fixed by welding.
[0010]
As described above, when the wrap portion L of the rear side member 4, the coil spring plate 8, and the reinforcement 10 is provided, the cross section of the wrap portion L becomes a double box-shaped cross section, and a torsional load in opposite directions is applied to the left and right sides of the vehicle body. In such a state, when a strain load is applied to the wrap portion L, it is possible to suppress the deformation of the cross section of the wrap portion L. According to the calculated values, in a normal vehicle body, the strength equivalent to +0.4 mm of the plate pressure of the reinforcement 10 was improved.
As described above, the rigidity of the cross section can be increased without increasing the thickness of the reinforcement 10. The rear side member structure has a good effect on a torsional load at the time of receiving a crosswind or a lane change, and gives a steering stability of the vehicle.
[0011]
FIG. 4 shows a vehicle side member structure according to a second embodiment of the present invention.
In the present embodiment, the inclined portion 11 rises from the rear end side of the wrap portion L, and the inclined portion 11 and the parallel portion 12 are provided in the wrap portion L. A concave portion 13 and a convex portion 14 are formed adjacent to the reinforcement 10 at the rear of the wrap portion L. At the rear end of the concave portion 13 and the reinforcement 10, the inner bottom surface 6c of the rear side member 4 and the reinforcement are formed. The rear side member 4 and the reinforcement 10 are fixed to each other by welding. Other shapes are the same as those in the first embodiment.
By forming the reinforcement 10 in such a shape, a plurality of box-shaped cross sections are provided, and the rigidity against a torsional load is further improved as compared with the first embodiment.
[0012]
FIG. 5 shows a vehicle side member structure according to a third embodiment of the present invention.
In the present embodiment, a trapezoidal convex portion 15 is formed on the rear side member 4 around the front end of the wrap portion L, and the reinforcement 10 causes the inclined portion 11 to rise within the wrap portion L, thereby enhancing the reinforcement. The front end of the parallel portion 12 of 10 extends to the projection 15 of the rear side member 4 and is fixed by welding.
In the present embodiment, a box-shaped cross section is formed between the rear side member 4 and the coil spring plate 8, and a box-shaped cross section is formed between the rear side member 4 and the reinforcement 10. Therefore, by forming the rear side member 4 and the reinforcement 10 in such a shape, a plurality of box-shaped cross sections are provided, and the rigidity against a torsional load is further improved as compared with the structure of the first embodiment.
[0013]
The embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments, and various modifications and changes can be made based on the technical idea of the present invention.
For example, in each of the above-described embodiments, the inclined portion 11 is formed. However, a vertical surface may be formed instead of the inclined portion 11 to form a step-like shape. You can choose. Further, although the inclined portion 11 and the parallel portion 12 are formed, the inclined portion 11 may be continued to the parallel portion 12 and the parallel portion 12 may be omitted.
[0014]
【The invention's effect】
As described above, the vehicular side member structure of the present invention provides a coil having a U-shaped cross-section extending in the vehicle front-rear direction on the lower surface of the floor panel, and a coil spring mounting portion provided on the side member. A spring plate is arranged in contact with both outer side surfaces and a lower bottom surface of the side member, and an end of the coil spring plate is arranged so that an end of a reinforcement arranged inside the side member wraps. The front end of the reinforcement is located at the gap between the coil spring plate and the reinforcement, and the front end of the reinforcement is spaced apart from the inner bottom surface of the side member. When a reverse load is applied, the strain rigidity of the side member in the cross-sectional direction increases. Further, it is possible to improve the steering stability when receiving a cross wind or when changing lanes.
In the vehicle side member structure, a contact surface between the inner bottom surface of the side member and the reinforcement is provided at a rear end side of the vehicle with respect to a wrap portion of the coil spring plate and the reinforcement panel, and At the rear side of the surface, there is a space between the inner bottom surface of the side member and the reinforce, so that when a reverse load is applied in the vehicle width direction, the strain rigidity in the cross section direction of the side member Is larger.
Further, the vehicle side member structure further includes a portion provided with a space between the coil spring plate and the inner bottom surface of the side member at a front end side of the vehicle with respect to a wrap portion between the coil spring plate and the reinforcement. Since the front end of the ment extends to the inner bottom surface, when a reverse load is applied in the vehicle width direction of the vehicle body, the strain rigidity in the cross-sectional direction of the side member is further increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle employing a vehicle side member structure according to a first embodiment of the present invention as viewed from below.
FIG. 2 is a perspective view of a rear side member of the vehicle shown in FIG.
FIG. 3 is a sectional view taken along the line BB in FIG. 2;
FIG. 4 is a sectional view (corresponding to FIG. 3) of a vehicle side member according to a second embodiment of the present invention.
FIG. 5 is a sectional view (corresponding to FIG. 3) of a vehicle side member according to a third embodiment of the present invention.
FIG. 6 is a perspective view of a rear side member of a conventional vehicle side member structure.
FIG. 7 is a sectional view taken along the line AA in FIG.
FIG. 8 is a perspective view showing a spot weld of the rear side member of FIG. 6;
FIG. 9 is a perspective view showing a state in which a vertical reverse load is applied to the body of the automobile.
FIG. 10 is a cross-sectional view of the rear side member for describing a state of distortion of the rear side member when a reverse load is applied to the body of the automobile.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automobile 2 Body 3 Floor 4 Rear side member 5a, 5b Flange 8 Coil spring plate 9 Spring seat 10 Reinforcement 11 Inclined part 12 Parallel part 13 Concave part 14, 15 Convex part

Claims (3)

A side member having a U-shaped cross section extending in the vehicle front-rear direction is disposed on the lower surface of the floor panel, and a coil spring plate provided with a coil spring mounting portion on the side member is in contact with both outer surfaces and the lower bottom surface of the side member. The end of the coil spring plate is arranged so that the end of the reinforcement arranged inside the side member is wrapped, and the coil spring plate and the reinforcement overlap with the reinforcement to form a reinforcement. A front end portion of the vehicle side member is spaced from an inner bottom surface of the side member. A contact surface between the inner bottom surface of the side member and the reinforcement is provided at a rear end side of the vehicle with respect to a wrap portion of the coil spring plate and the reinforcement panel, and a side member is provided at a rear side of the contact surface. 2. The vehicle side member structure according to claim 1, wherein a portion is provided at an interval between the inner bottom surface and the reinforcement. On the front end side of the vehicle relative to the wrap portion of the coil spring plate and the reinforcement, a portion spaced apart from the inner bottom surface of the side member and the coil spring plate is provided, and the front end portion of the reinforcement is extended to the inner bottom surface. The vehicle side member structure according to claim 1, wherein:

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