JPH09254623A - Rear suspension construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a suspension construction. SOLUTION: An axle pipe 2 is placed along the horizontal direction of a vehicle body, and a mounting bracket 6 for a suspension arm 9 is secured to the side of the axle pipe 2. A double-end stud 10 used for securing the suspension arm 9 to the mounting bracket 6 has one end formed into a screw for attaching the lower end 21 of a shock absorber 15 and the other end into a screw for mounting the suspension arm 9 to the axle pipe 2, with both the shock absorber 15 and the suspension arm 9 attached to the stud.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension structure that connects an automobile body and an axle.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional suspension structure 31 for an automobile. This suspension structure 31
Indicates the rear side of the automobile, and the rear wheel 33 is provided at the end of the axle pipe 32 arranged in the lateral direction of the vehicle body.
Is installed. A coil spring 35 is arranged in a compressed state between a spring seat 34 provided on the upper portion of the axle pipe 32 and a vehicle body (not shown).

A shock absorber 36, which is provided to absorb the shock of the coil spring 35, has an upper end portion 46 attached to the vehicle body side, and a lower end portion attached to a mounting bracket 37 fixed to the axle pipe 32 by welding. ing. A mounting bracket 38 is fixed to the axle pipe 32, and one end of a suspension arm 39 is swingably attached to the mounting bracket 38.

FIG. 5 is a sectional view showing a state in which the suspension arm 39 is attached. As shown in the figure, the suspension arm 39 has a through hole 41 formed at the end thereof to allow the bolt 40 to penetrate therethrough, and an annular rubber bush 42 for softening the impact is attached around the through hole 41. The suspension arm 39 is mounted by aligning the ends of the through holes 41 with the mounting holes 43, 44 of the mounting bracket 37, inserting the bolts 40 into these holes 41, 43, 44, and fastening the nuts 45. It is fixed to the bracket 38.

Although the conventional suspension structure 31 has the above-mentioned structure, as shown in FIG. 6, the axle pipe 32 plays a role of supporting the weight F of the vehicle body which is applied to the coil spring 35. Further, the coil spring 35 serves to absorb the impact applied to the body by the spring force, and the shock absorber 36 serves to damp the vibration of the coil spring 35.

[0006]

As shown in FIG. 4, a mounting bracket 37 of a shock axobar 36 is fixed to the lower portion of the coil spring 35 by welding. As described above, the axle pipe 32 has the coil spring 3
The weight F of the vehicle body is applied via 5. As described above, when the welding portion of the mounting bracket 37 exists near the lower side of the coil spring 35, which is a heavy weight of the vehicle body, stress concentration occurs in the welding portion. Therefore, the thickness of the axle pipe 32 is increased to increase the strength. Need to raise. On the other hand, the shock absorber 36
Must be fixed near the coil spring 35 in the layout of the vehicle.

The present invention has been made in view of the above problems. To eliminate the risk of stress concentration on the axle pipe, the exclusive mounting bracket for the shock absorber is eliminated and the thickness of the axle pipe is not increased more than necessary. The purpose is to provide a rear suspension structure that can be achieved.

[0008]

The above object is to provide an axle pipe which is disposed laterally of a vehicle body and which suspends a wheel, and a coil spring which is disposed in a compressed state between the vehicle body and the axle pipe. A rear suspension structure including a suspension arm swingably mounted on the axle pipe via a mounting bracket mounted on the axle pipe, and a shock absorber for suppressing vibration of the coil spring. The rear suspension structure is characterized in that the lower end portion of the above is attached to the attachment bracket of the suspension arm.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A rear suspension structure according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an automobile suspension structure 1 according to the present invention. This suspension structure 1 shows the rear side of an automobile, and a rear wheel 3 is attached to an end portion of an axle pipe 2 arranged in a lateral direction of a vehicle body. A coil spring 5 is provided between a spring seat 4 provided on the upper portion of the axle pipe 2 and a vehicle body (not shown).
Are arranged in a compressed state.

Between the rear wheel 3 and the coil spring 5, a suspension arm mounting bracket 6 having a U-shaped cross section is fixed to the peripheral portion of the axle pipe 2 by welding. The end of the suspension arm 9 is inserted between the side plates 7 and 8 of the mounting bracket 6. FIG.
FIG. 7 is a cross-sectional view showing a state in which the suspension arm 9 is attached to the attachment bracket 6. The suspension arm 9 has an annular end portion, and as shown in the drawing, has a through hole 11 for allowing the screw bolts 10 to pass therethrough.

FIG. 3 shows a double screw bolt 10. Each of the screw bolts 10 is provided with a nut 12 at a substantially central portion thereof, a large-diameter bolt 13 for mounting the suspension arm 9 is provided on a right side portion of the nut 12, and an M8 screw groove 14 is formed at a right end portion thereof. A small diameter bolt 16 for mounting the shock absorber 15 is provided on the left side of the nut 12, and M6 is attached to the left end.
The thread groove 17 is formed.

When the suspension arm 9 is mounted, the through hole 11 of the suspension arm 9 is screwed into the through holes 18 and 19 formed in the side plates 7 and 8 of the mounting bracket 6.
Adjust to Then, the large-diameter bolts 13 of the screw bolts 10 are inserted into the holes 11, 18, and 19 from the side plate 7 side.
The nut 12 is inserted until it comes into contact with the side plate 7, and the nut 20 is fastened and attached to the large diameter bolt 13. On the other hand, when mounting the lower end portion 21 of the shock absorber 15, the shock absorber 1 is attached to the small-diameter bolt 16 of the double screw bolt 10.
The through hole 21a provided in the lower end portion 21 of 5 is inserted, and the nut 22 is fastened to the small diameter bolt 16.

In the present embodiment, because of the above-mentioned configuration, it is not necessary to provide the axle pipe 2 with the mounting bracket dedicated to the shock absorber 15, as shown in FIG. Therefore, it is not necessary to attach the mounting bracket 37 to the lower portion of the coil spring 35 as in the conventional case, and it is not necessary to increase the wall thickness of the axle pipe 2 in consideration of the above stress concentration.

As shown in FIG. 2, the shock absorber 1
Nut 1 provided on both-screw bolts 10 for attaching 5
2 serves as a spacer, and by changing the thickness thereof, the position of the shock absorber 15 can be changed in the axial direction of the both-screw bolts 10, and the versatility can be provided.
Further, since the small-diameter bolt 16 portion of both screw bolts 10 is a stepped bolt and the diameter of the screw groove 17 is smaller than the diameter of the through hole 21a of the shock absorber 15, there is a margin between the screw groove 17 and the through hole 21a. And the assemblability of the shock absorber 15 is improved. Since the mounting bracket for the shock absorber 15 is eliminated, the cost and weight can be reduced by reducing the number of parts.

As shown in the conventional example of FIG. 4, since the shock absorber 36 is a vibration transmission path from the tire,
Upper end portion 4 which is a vehicle body side mounting portion of the shock absorber 36
It was necessary to attach a large rubber bush 47 to No. 6.
According to the suspension structure of this embodiment, as shown in FIG. 2, the transmission coefficient is changed by being provided coaxially with the suspension arm 9 having the rubber bush 23, and the vibration dB can be suppressed. As a result, FIG.
As shown in, the rubber bush 2 of the shock absorber 15
It is possible to reduce the size by 4.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, the lower end portion 21 of the shock absorber 15 and the suspension arm 9 are attached by using the both-screw bolts 10. However, the shock absorber 15 is attached to the attachment bracket 6 of the suspension arm 9. You may make it attach the bracket for and attach the lower end part 21 of the shock absorber 15 here.

[0019]

As described above, according to the present invention, it is not necessary to provide a mounting bracket dedicated to the shock absorber on the axle pipe, so that it is not necessary to attach the bracket to the lower portion of the coil spring as in the conventional case. It is not necessary to increase the thickness of the axle pipe in consideration of stress concentration. As a result, it is possible to reduce the cost by saving the material cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a suspension structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line XX in FIG.

FIG. 3 is a side view of a double-screw bolt used in the suspension structure according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a suspension structure of a conventional example.

5 is a cross-sectional view taken along line YY in FIG.

FIG. 6 is a front view showing a state where a load is applied to the axle pipe.

[Explanation of symbols]

 1 Suspension structure 2 Axle pipe 3 Rear wheel 5 Coil spring 6 Mounting bracket 9 Suspension arm 10 Double screw bolt 15 Shock absorber 21 Lower end

Claims (2)

[Claims] 1. An axle pipe arranged laterally of a vehicle body for suspending a wheel, a coil spring arranged in a compressed state between the vehicle body and the axle pipe, and attached to the axle pipe. In a rear suspension structure including a suspension arm that is swingably attached to an axle pipe via a mounting bracket and a shock absorber that suppresses vibration of the coil spring, a lower end portion of the shock absorber is attached to the suspension arm. Rear suspension structure characterized by being mounted on a mounting bracket. 2. The shock absorber and the suspension using a double screw bolt, one end of which is a mounting screw for the lower end of the shock absorber, and the other end of which is a mounting screw for an end of the suspension arm on the axle pipe side. The rear suspension structure according to claim 1, wherein the rear suspension structure and the arm are coaxially installed side by side.