JPS6325405Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a shock absorbing device interposed in a rotating portion such as both end support portions of a leaf spring.

BACKGROUND OF THE INVENTION As shown in FIG. 1, a shock absorbing device is known in which an elastic bushing d having a flange c on the outer peripheral surface thereof is press-inserted from both sides between an outer cylinder a and a shaft member b.

However, when a load in a direction perpendicular to the axis acts as a load, such a device has the disadvantage that it cannot support a high load because the stress acting on the bush d escapes in the circumferential direction as shown in Figure 2. Furthermore, there are disadvantages such as the bush d being twisted and easily worn and damaged by a torsional load.

The purpose of the present invention is to obtain a device free of such inconveniences, and a flange 3 is provided on the outer peripheral surface of the space formed between the outer cylinder 1 and the shaft member 2 from both outer sides. An elastic bushing 4 made of rubber or the like is press-fitted with the flange 3 remaining, and is supported in an axially compressed state between support arms 8 along both outer edges of the elastic bushing 4. In the shock absorbing device, at least the inner circumferential surface of the elastic bushing 4 except for the outer end of the inner circumferential surface of the outer part to the part inserted into the outer cylinder 1 is made of hard synthetic resin. The bearing member 5 is provided as one body, and a circumferential protrusion 6 is provided on the inner circumferential surface of the outer side of the bush 4. The bearing member 5 is made of a hard and friction-resistant material such as acetal resin (Dyuragon) or 6.6 nylon resin. Uses a polymeric material with high properties.

In the case shown in FIG. 3, a bearing member 5 made of a hard synthetic resin is applied while leaving the inner circumferential surface of the elastic bushing 4 corresponding to the inner circumferential surface of the flange 3. However, as shown in FIG. A portion without the bearing member 5 may also be provided on the inner circumferential surface of the inner side. The elastic bushing 4 and the bearing member 5 are integrally formed by vulcanization.

In the illustrated embodiment, a groove 7 in the circumferential direction is provided on the outer peripheral surface of the shaft member 2 in correspondence with the protrusion 6 of the bush 4, but the groove 7 is not necessarily required.

This device includes support arms 8 attached to both ends of the shaft member 2,
8 to be attached to a vehicle, etc., a threaded portion 2a is provided at one end of the shaft member 2, and the end of the shaft member 2 is inserted into a through hole 8a provided in one support arm 8. After that, the nut 2b is attached to the threaded part 2a from the outside.
One of the support arms 8 is fastened and fixed to the shaft member 2, and the other support arm 8 is integrally connected to the shaft member 2. At this time, the bush 4 has both support arms 8,
8 and is compressed in the axial direction by tightening.

In this device, a bearing member 5 made of hard synthetic resin is provided on the inner circumferential surface of the elastic bushing 4.
When a load is applied in a direction perpendicular to the axis,
Stress escapes in the circumferential direction of the shaft member 2 and tends to distort the elastic bushing 4, but this is prevented by the hard synthetic resin integrally formed on the inner peripheral surface, thereby preventing the elastic bushing 4 from becoming distorted. The device can support a high load, and the torsional load applied to the device is absorbed by rotation between the elastic bushing 4 and the shaft member 2 due to the bearing effect of the bearing member 5. Since no torsional load is applied to the elastic bushing 4 and the bearing member 5 is made of hard synthetic resin, it can be used without lubrication.
is applied to the inner circumferential surface of the elastic bushing 4, leaving at least the outer inner circumferential surface, so that the elastic bushing 4 can be compressed in the axial direction in the area where the bearing member 5 is not provided. Therefore, the load in the axial direction can be buffered, and since the circumferential protrusion 6 is provided on the inner circumferential surface of the outer side of the elastic bushing 4, the protrusion 6 allows the space between the shaft member 2 and the bearing member 5 to be reduced. Prevents muddy water etc. from entering.

According to the present invention, the bearing member 5 is integrally provided on the inner peripheral surface of the elastic bushing 4 which is press-fitted between the outer cylinder 1 and the shaft member 2. Eliminates the inconveniences seen in conventional examples,
Moreover, since the bearing member 5 is provided on the inner circumferential surface of the elastic bushing 4 other than at least the outer inner circumferential surface,
The elastic bushing 4 can be compressed in the part where the bearing member 5 is not present, thereby exerting an axial cushioning effect, and furthermore, it can be compressed even in a part of the part inserted into the outer cylinder 1. By providing a portion without the bearing member 5, it is possible to apply a combined compressive pressure in the axial direction and in the direction of crimping the shaft member 2 to the inner circumferential surface of both outer sides, and the inner circumferential surface of the elastic bushing 4 is Even if the bearing member 5 is provided to allow mutual rotation between the elastic bushing 4 and the shaft member 2, the inner circumferential surfaces of both outer sides of the elastic bushing 4 are in tight contact with the outer circumferential surface of the shaft member 2, Moreover, since the circumferential protrusion 6 is provided on the inner circumferential surface of the outer side of the elastic bushing 4, the contact pressure against the shaft member 2 is higher on the outer side than on other parts, and this part acts as a sealing part, and the bearing member It is possible to reliably prevent muddy water etc. from entering between the bearing member 5 and the shaft member 2, and the fact that the bearing member 5 is made of hard synthetic resin makes it possible to obtain a shock absorbing device that can be used for many years. Furthermore, when this is used as a support for leaf springs interposed between the wheels and the body of a vehicle, the spring system in the torsional direction can be ignored, so the spring constant of the spring system for the entire suspension can be The height of the bushing 4 can be lowered to improve riding comfort, and by simply providing a circumferential protrusion on the inner circumferential surface of the outer side of the bushing 4, the intrusion of muddy water and the like can be prevented. This has the advantage of having a simpler structure and easier assembly than those provided with a sealing member.

[Brief explanation of the drawing]

In the drawings, Figure 1 is a half-cut side view of the conventional example, and Figure 2 is a side view of the conventional example.
The figure is a cut-away front view showing a state in which a load is applied in a direction perpendicular to the axis, Figure 3 is a half-cut side view of an example of the implementation of the present invention, and Figure 4 is a cut-away front view showing a state in which a load is applied in a direction perpendicular to the axis. A cutaway front view showing the state, and FIG. 5 is a half cutaway side view of another embodiment. 1... Outer cylinder, 2... Shaft member, 3... Flange,
4...Elastic bushing, 5...Bearing member, 6...Protrusion.

Claims (1)

[Scope of utility model registration request] An elastic bushing 4 made of rubber or the like having a flange 3 on the outer circumferential surface of the outer side is press-fitted from both outsides of the gap formed between the outer cylinder 1 and the shaft member 2, leaving the flange 3 portion. , in a shock absorbing device supported in an axially compressed state between support arms 8, 8 along both outer ends of the elastic bushing 4, at least the outer side of the inner circumferential surface of the outer side of the elastic bushing 4. A bearing member 5 made of hard synthetic resin is integrally provided on the inner circumferential surface of the bushing 4 except for the part inserted into the outer cylinder 1 from the end, and a bearing member 5 made of hard synthetic resin is integrally provided on the inner circumferential surface of the outer part of the bush 4 in the circumferential direction. A shock absorber comprising a protrusion 6.