JPH0858327A - Rear suspension structure - Google Patents

Abstract

PURPOSE: To provide the rear suspension structure which can surely hold a bush with outer cylinder and being advantageous in the cost. CONSTITUTION: In the rear suspension construction in which one end part of a trailing arm member is pivoted between a pair of side walls of a bracket mounted on an axle shaft and the other end part of the trailing arm member is pivoted with a body frame, burring work is conducted in the directions opposite to each other on a plurality of pivoted parts of the plate-likely formed trailing arm member main body 1 with a bracket 11. Bushes 7 with outer cylinders are press-fitted into hole parts worked by burring so as to form the trailing arm member, and one end part of the trailing arm member is pivoted between the mutual side walls 12 of the bracket 11 through the bushes 7 with outer cylinders.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an economical rear suspension structure capable of preventing the bush with an outer cylinder from coming off, reducing the number of parts and reducing the weight.

[0002]

2. Description of the Related Art Among four-wheeled vehicle rear suspensions, there is a type called a three-link type (also called an isolated trailing link type).

This three-link rear suspension is
As shown in FIGS. 3 to 5, the trailing link 10
0 and lateral rod 101 for axle shaft 1
02 is supported by a vehicle body frame 103, and an axle shaft 102 is suspended by a coil spring 104 and a shock absorber 105.

The trailing link 100 used for the three-link type rear suspension has conventionally been a link having a hat structure having a press structure as shown in FIG.
The link of the hat cross section of the press structure is formed by welding a pipe 108 in which a bush 107 with an outer cylinder is press-fitted to both ends (two at one end and one at the other end) of a link body 106 formed in the hat cross section. is there. One end of the bush 107 with an outer cylinder is pivotally supported by a pair of side walls of a bracket 111 of the axle shaft 102 via a bolt 109 and a nut 110, and the other end thereof is pivotally supported by the vehicle body frame 103. Reference numeral 112 is a wheel supported by the axle shaft 102.

Since such a link having a hat-shaped cross-section having a press structure requires the pipe 108 to be welded in advance, it has the drawbacks of high cost and heavy weight.

Further, as shown in FIG. 7, there is also a bush 113 without an outer cylinder, provided with slip-out preventing flanges 114 at both ends and press-fitted into the pipe 108 to prevent slipping out of the pipe 108. .

[0007]

However, in this case as well, since the pipe 108 for holding the bush 113 is required, there is a problem that the cost is high and the weight is heavy.

An object of the present invention is to solve the above problems and to provide a rear suspension structure that can reliably hold a bush with an outer cylinder and is advantageous in terms of cost.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention rotatably supports one end of a trailing arm member between a pair of side walls of a bracket mounted on an axle shaft so as to support the trailing arm member. In a rear suspension structure in which the other end is pivotally supported by the vehicle body frame, a plurality of axially supporting portions of the plate-shaped trailing arm member main body with the above brackets are subjected to burring processing in mutually opposite directions, and holes formed by the burring processing are performed. A bush with an outer cylinder is press-fitted into the portion to form a trailing arm member, and one end of the trailing arm member is pivotally supported between the side walls of the bracket through the bush with the outer cylinder.

[0010]

With the burring process, a plurality of flanged holes are formed in the trailing arm member body so that the flanges are in opposite directions. The trailing arm member is formed by press-fitting the bush with the outer cylinder into the hole formed by the burring process. Then, the bush with the outer cylinder is pivotally supported between the side walls of the bracket, and one end of the trailing arm member is mounted. Because the bush with outer cylinder is difficult to come off on the flange side due to the burring process,
Since the bush with the outer cylinder on the side of one of the flanges contacts the side wall, the bush with the outer cylinder does not fall off.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 is a trailing arm member main body which constitutes a suspension of an automobile. The trailing arm member body 1 is formed by press-molding one long plate member, and is formed with bent portions 1a and 1b on both upper and lower sides. The trailing arm member main body 1 has one hole at one end and a hole 2 formed by burring, and the other end has two holes burred in opposite directions to form holes 3 and 4. . In this way, the flange portion 5 is formed on the peripheral edge of the hole portion 2, and the flange portions 6 ₁ and 6 ₂ which are opposite to each other are formed on the peripheral edge portions of the hole portions 3 and 4.

Reference numeral 7 denotes a bush with an outer cylinder which is press-fitted into the holes 2, 3 and 4 of the trailing arm member body 1. The bush with outer cylinder 7 has a bush 9 press-fitted into the outer cylinder 8, The spacer 10 is inserted on the axis line of 9. This bush with outer cylinder 7 connects a trailing arm member via a bolt 13 and a nut 14 between a pair of side walls 12 of a bracket 11 mounted on an axle shaft. Since the bushes 7 with an outer cylinder press-fitted into the holes 3 and 4 are formed such that the flange portions 6 ₁ and 6 ₂ are oriented in opposite directions, the bush 7 with an outer cylinder is not provided on the flange portions 6 ₁ and 6 ₂ sides. It is hard to come off. Therefore, when the bush 7 with an outer cylinder hits the side wall 12 on the side where the flange portion 6 ₁ (6 ₂ ) is not present, at the same time, the flange portion 6 ₂ (6 ₁ )
Since the outer cylinder bush 7 on the side abuts the side wall 12, the outer cylinder bush 7 is less likely to come off.

According to the above structure, the bush 7 with the outer cylinder is arranged between the pair of side walls 12 of the bracket 11 mounted on the axle shaft, and the bolt 13 is inserted into the spacer 10 of the bush 7 with the outer cylinder to insert the nut. It is screwed in via 14. Thus, even if the trailing arm member main body 1 moves to the left and right, the bush 7 with the outer cylinder is difficult to come off in the convex direction in which the flange portions 6 ₁ , 6 _{2 of the} holes 3, 4 are located. Can be prevented.

[0015]

As described above, according to the rear suspension structure of the present invention, the following effects can be obtained. The rear suspension structure according to claim 1, wherein one end of the trailing arm member is pivotally supported between a pair of side walls of a bracket mounted on an axle shaft, and the other end of the trailing arm member is pivotally supported by a vehicle body frame. , A plurality of shaft support portions of the plate-shaped trailing arm member main body with respect to the bracket are subjected to burring processing in mutually opposite directions, and a bushing with an outer cylinder is press-fitted into the hole portion formed by the burring processing to perform the trailing arm. Since the member is formed and one end of the trailing arm member is pivotally supported between the side walls of the bracket through the bush with the outer cylinder, the bush with the outer cylinder is pulled out in the convex direction where the flange portion of the hole is present. Since it is difficult, the bush with the outer cylinder can be prevented from falling off. Further, as compared with the link having the hat cross section of the press structure, the cost can be reduced and the weight can be reduced.

[Brief description of drawings]

FIG. 1 is a conceptual cross-sectional view showing a rear suspension structure according to the present invention.

FIG. 2 is a conceptual perspective view showing a trailing arm member of a rear suspension structure according to the present invention.

FIG. 3 is a partial cross-sectional view showing a 3-link type rear suspension structure.

FIG. 4 is a left side view of FIG.

FIG. 5 is a perspective view showing a trailing arm member of a conventional rear suspension structure.

FIG. 6 is an exploded perspective view of a conventional trailing arm member.

FIG. 7 is a cross-sectional view showing a bush without an outer cylinder used in a conventional trailing arm member.

[Explanation of symbols]

1 Trailing arm member main body 2 Hole part 3 Hole part 4 Hole part 5 Flange part 6 ₁ , 6 ₂ Flange part 7 Bushing with outer cylinder 8 Outer cylinder 9 Bushing 10 Spacer 11 Bracket 12 Side wall 13 Bolt

Claims (1)

[Claims] 1. A rear suspension structure in which one end of a trailing arm member is pivotally supported between a pair of side walls of a bracket mounted on an axle shaft, and the other end of the trailing arm member is pivotally supported by a vehicle body frame. , A plurality of shaft support portions of the plate-shaped trailing arm member main body with the above bracket are subjected to burring processing in mutually opposite directions, and a bush with an outer cylinder is press-fitted into a hole portion formed by the burring processing to perform the trailing arm. Forming a member,
A rear suspension structure in which one end of a trailing arm member is pivotally supported between the side walls of the bracket via the bush with the outer cylinder.