JPS62171533A - Rubber bush of suspension link - Google Patents

Abstract

PURPOSE:To improve both running stability and riding comfortableness by specifying elastic characteristic for more frequent backward load among load acting on a vehicle. CONSTITUTION:Both end fixing portions 3, 4 of a trailing link 1 are respectively formed by inserting rubber bushes 13, 14 comprising rubber elastic bodies 11, 12 interposed between inner cylinders 7, 8 and outer cylinders 9, 10 in cylinders 5, 6 fixed to a connecting member 2. Hollow theft portions 11a, 11b, 12a, 12b piercing in the axial direction of both cylinders 7-10 are formed at the connecting regions of the rubber elastic bodies 11, 12 with the connecting member 2 and the opposite regions. The hollow theft portions 11a, 12a of the connecting regions with the connecting member 2 are divided into two parts substantially symmetrically by previously pre-compressed partition wall portions 11c, 12c. The rubber bushes 13, 14 show high rigidity at the time of light load and great load among backward load, and show low rigidity at the time of middle load to improve running stability and riding comfortableness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rubber bushing used in a suspension link of a vehicle such as an automobile.

(Prior art) Generally, in the rear suspension system of an automobile,
As shown in FIG. 4, a knuckle b supporting an axle a is attached to the vehicle body with lateral links c and d, a trailing link 8, and a shock absorber f.

Note that g is a cross member and h is a stabilizer.

A suspension link such as the trailing link e has mounting parts el and e2 rotatably mounted on the vehicle body side and the axle (knuckle b) side, which are connected via a connecting member e3. e1. A rubber bush is provided on the ez.

As a suspension link using such a rubber bushing, for example, as described in Japanese Utility Model Application Publication No. 58-99536, a rubber elastic body having hollow recesses or recesses at two locations in the front and rear is interposed between the outer cylinder and the inner cylinder. The outer cylinder is recessed toward the inner cylinder to reduce the gap between one hollow hollow part or the hollow part, or a rubber bushing made of a precompressed rubber elastic body is attached to the control arm. By changing the support rigidity in the longitudinal direction of the vehicle body,
It is known that the front side is softer and the rear side is harder, making the suspension firmer and less likely to transmit vibrations during steady driving.

(Objective of the Invention) The present invention focuses on the fact that most of the load that acts on wheels is rearward, and improves the elastic properties against this rearward load to improve running stability and riding comfort. The purpose of the present invention is to provide a rubber bushing for a suspension link that is compatible with the above.

(Structure of the Invention) The present invention provides an axle-side attachment portion and a vehicle body-side attachment portion of a suspension link in which an axle-side attachment portion and a vehicle-body side attachment portion are provided at both ends of a connecting member extending in the longitudinal direction of the vehicle body. A rubber-like elastic body is interposed between an outer cylinder and an inner cylinder, and both cylinders are attached to the connecting side of the rubber-like elastic body and the opposite side thereof. A hollow recess is formed that penetrates in the axial direction, and the hollow recess on the connection side with the connecting member is separated by a pre-compressed partition wall.

As a result, when a rearward load is applied to the wheel, the rubber bushing on the axle side or the vehicle body side attachment part does not deform until the load overcomes the precompression force, so it has high rigidity and can overcome it. If the load reaches such a level that the hollow hollow part on the connection side with the connecting member disappears, the rubber-like elastic body will deform due to the change in volume of the hollow hollow part, resulting in a decrease in rigidity. However, the rigidity becomes higher.

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

In Figures 1 and 2, 1 is a trailing link (suspension link) arranged approximately in the longitudinal direction of the vehicle body.
At both ends of the connecting member 2 (the middle is omitted in the drawing),
A vehicle body side attachment part 3 and an axle side attachment part 4 are provided.

Both the mounting parts 3 and 4 have a cylindrical body 5 fixed to the connecting member 2.
, 6, a rubber bush 13.1 in which a rubber-like elastic body 11.12 is interposed between the outer cylinders 7, 8 and the inner cylinders 9, 1o.
4 is inserted.

The outer cylinders 7 and 8 are formed to be thinner and slightly shorter than the cylinder bodies 5 and 6. Also, the inner cylinder 9°10 is the outer cylinder 7
.

The rubber-like elastic bodies 11 and 12 are fixed to the inner cylinders 9 and 10 over the entire outer peripheral surfaces of the inner cylinders 9 and 10, but to the outer cylinders 7 and 8, they are fixed to the connecting members. An outer cylinder 7°8 and an inner cylinder 9. Hollow hollow parts 11a, llb, 12a, which penetrate in the axial direction of lO,
12b is formed. Therefore, both of the hollow recesses 11a and 12a at the connection side with the connection member 2 are as follows.
The partition wall portions 11c and 12c are divided into substantially symmetrical sections by pre-compressed partition wall portions 11c and 12c. As a result, the partition wall section llc, 12
At point c, precompression forces act in opposite directions, and the partition wall portions 11e and 12c press against the inner circumferential surface of the outer cylinder 7.8.

The outer peripheral surfaces of the rubber-like elastic bodies 11 and 12 have a hollow hollow part 11.
It is fixed to the outer cylinders 7 and 8 except for the parts where a, llb, 12a and 12b are formed. Note that the partition wall portions 11c and 12c are only pressed against the outer cylinder 7.8 and are not fixed to the outer cylinder 7.8.

With the above configuration, when a load acts in the rear direction such as during normal driving or acceleration, light loads (0 to 3
0 kg) is applied, the axle side mounting part 4
The pre-compression force of the partition wall portion 12c of the rubber-like elastic body 12 of the rubber bush 14 overcomes the light rearward load, and the rubber-like elastic body 12 does not deform and maintains high rigidity, resulting in stable running. Good performance (Fig. 3, area S).

In addition, in an operating range where a medium load (approximately 30 to 100 kg) acts, the medium load in the rear direction overcomes the precompression force at the partition wall portion 12c of the rubber elastic body 12 of the rubber bushing 14, causing the hollow hollow portion 12a to deform. While it becomes smaller,
Accordingly, the hollow recessed portion 12b becomes larger, resulting in a decrease in rigidity. Therefore, the riding comfort is improved (region 82 in FIG. 3).

Furthermore, in the operating range where a large load (approximately 100 kg or more) is applied, the hollow hollow part 12a deforms and disappears.
The rubber-like elastic body 12 becomes difficult to deform, and its rigidity increases.
Interference of the trailing link l with other members is prevented (
(Fig. 3 83 area).

Conversely, when a forward load is applied, the characteristics shown in the region 84 in FIG. 3 are obtained.

Therefore, the rubber bush 13 of trailing link 1
．． 14, as shown in FIG. 3, it is possible to achieve both running stability and ride comfort in the rearward direction where loads are frequently applied to the vehicle. In addition, in FIG. 3, the load P in the rearward direction is assumed to be positive.

The rearward displacement δ of the trailing link 1 is assumed to be positive.

(Effects of the Invention) As described above, the present invention deals with loads that frequently act on the vehicle in the rear direction, so that the rigidity is high during light loads and large loads, and the rigidity is low during medium loads. , it is possible to achieve both improved driving stability and ride comfort.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are a front view and a partially sectional side view of a trailing link, with some parts omitted, respectively, and FIG. 3 shows an example using a rubber bushing with a diameter of 50 nn. FIG. 4 is an exploded perspective view of the rear suspension device of an automobile. 1... Trailing link, 2... Connection member, 3... Axle side mounting part, 4...
Vehicle body side mounting part, 7, 8... Outer cylinder, 9, 10...
...Inner cylinder, 11.12...Rubber-like elastic body,
lla, llb, 12a, 12b-...Hollow corner, llc, 12c...Partition wall part, 13.14.
...Rubber bush.

Claims (1)

[Claims] (1) A suspension link that is attached to the axle-side attachment portion and the vehicle body-side attachment portion of a suspension link, in which an axle-side attachment portion and a vehicle-body side attachment portion are provided at both ends of a connecting member extending in the longitudinal direction of the vehicle body; , a rubber-like elastic body is interposed between the outer cylinder and the inner cylinder, and the rubber-like elastic body penetrates in the axial direction of both cylinders at the connection side with the connection member and the opposite side thereof. A rubber bush for a suspension link, characterized in that a hollow recess is formed, and the hollow recess on the side connected to a connecting member is divided into two by a pre-compressed partition wall.