JPH0115572Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an idler arm bearing device used in an independent suspension type automobile steering system.

2. Description of the Related Art Conventionally, an idler arm used in a steering linkage of an automobile has been attached to a vehicle body, for example, as shown in FIG.

In FIG. 1, 1 is an idler arm, and 2 is an idler arm bracket having a bracket shaft portion 2a formed at one end.The idler arm 1 is attached to the bracket shaft portion 2a by inserting a rubber bushing into the outer periphery of the guide tube 7. Alternatively, the idler arm 1 is fixed by pressing a nut 8 through a washer 6 with an idler bush 3 formed by baking, and the idler bracket 2 is the fulcrum.
A restoring force is generated by the twisting of the idler bush 3 against the movement of. In addition, Idol love 3
Both ends of the cushion part 4 are formed in a flange shape to absorb vibrations in the vertical direction.

However, in such a conventional idler arm bearing device, since both ends of the idler arm guide tube 7 are pressed and fixed by tightening with the nut 8, the idler arm guide tube 7 is twisted by the movement of the idler arm 1. When the idler arm guide tube 7 slips easily against the idler bracket 2, it becomes impossible to obtain the torsional force to restore the idler arm 1, and the gap between the idler arm guide tube 7 and the bracket shaft portion 2a may become slippery. This caused problems such as abnormal wear and play in the idler arm 1.

The present invention was developed in view of these conventional problems, and aims to firmly fix the idler bush by the idler arm guide tube to the idler arm bracket and generate appropriate torsional force against the movement of the idler arm. An object of the present invention is to provide an idler arm bearing device for an automobile steering system.

In order to achieve this objective, the present invention forms the vicinity of the base of the bracket shaft of the idler arm bracket in a tapered shape, and when the idler arm guide tube with an idler bush attached to the outer periphery is attached to the bracket shaft by tightening a nut. The idler arm guide tube is press-fitted into a tapered portion formed near the base of the bracket shaft, and the idler arm guide tube is firmly fixed to the idler arm bracket.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 is an explanatory diagram showing an embodiment of the present invention in cross section of a bearing portion.

First, to explain the configuration, 1 is an idler arm, 2 is an idler arm bracket, and the idler arm large boss portion 5 is attached to the bearing part of the idler arm 1 that supports the idler arm bracket 2.
is formed. The idler arm bracket 2 has a bracket shaft portion 2a at one end, and in the present invention, a tapered portion 10 is formed near the base of the bracket shaft portion 2a.

On the other hand, 7 is an idler arm guide cylinder, and a rubber idler bush 3 is molded on the outer circumference by inserting or baking.In the assembled state shown in the figure, the idler arm guide cylinder 7 is inserted through a washer 6 into a nut. By tightening and fixing the idler bush 3 to the bracket shaft portion 2a of the idler arm bracket 2 by tightening 8, the idler bush 3 is interposed between the idler arm large boss portion 5, and both ends of the idler bush 3 extend in a flange shape. This forms a cushion portion 4 that absorbs vibrations in the vertical direction.

Next, the assembly and operation of the bearing device shown in FIG. 2 will be explained.

First, in assembling the bearing device, for the idler arm large boss portion 5 of the idler arm 1,
The idler arm guide tube 7 with the idler bush 3 molded on its outer periphery is inserted into the bracket shaft portion 2a and then pushed into the bracket shaft portion 2a.Next, the nut is inserted into the threaded portion 9 formed at the lower end of the bracket shaft portion 2a through the washer 6. 8, and by tightening the nut 8, the idler arm guide tube 7 is press-fitted into the tapered portion 10 formed near the base of the bracket shaft portion 2a.

By press-fitting the idler arm guide cylinder 7 into the tapered part 10, the idler arm guide cylinder 7 is firmly fixed to the taper part 10 of the bracket shaft part 2a with a deforming force due to the spreading of the cylinder end of the idler arm guide cylinder 7. be done.

Therefore, even if the idler arm bracket 2 is twisted due to the movement of the idler arm 1, the idler arm guide tube 7 does not slip relative to the idler arm bracket 2, and the appropriate twisting force for restoring the idler arm 1 is applied. can occur.

FIG. 3 is an explanatory diagram showing another embodiment of the present invention, and this embodiment has an idler arm bracket 2.
A tapered part 10 is formed near the base of the bracket shaft part 2a, and a stepped part 12 is also formed.The formation of the stepped part 12 further increases the strength of the bracket shaft part 2a, which has a cantilevered shaft structure. By forming the stepped portion 12, the amount of deformation when the idler arm guide tube 7 is press-fitted is increased, thereby obtaining a bearing device with even more balanced strength.

Next, to explain the effects of the present invention, when the idler arm bracket is tapered near the base of the bracket shaft, and the idler arm guide tube with the idler bush attached to the outer periphery is attached to the bracket shaft by tightening a nut, Since the idler arm guide cylinder is press-fitted into the tapered part formed near the base of the bracket shaft, the idler arm guide cylinder is firmly attached to the idler arm bracket with sufficient strength by press-fitting the idler arm guide cylinder into the taper part. Even if the idler bush is twisted due to the movement of the idler arm, the idler arm guide tube does not slip against the idler arm bracket, and the appropriate torsional force is stably generated to restore the idler arm. can do.

Further, by forming a tapered stepped portion near the base of the bracket shaft portion, the strength of the bracket shaft portion of the idler arm bracket can be increased, and furthermore, the fixing strength can be further increased by press-fitting into the idler arm guide cylinder stepped portion.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing an example of a conventional device;
The figure is an explanatory diagram showing one embodiment of the present invention, and FIG. 3 is an explanatory diagram showing another embodiment of the present invention. 1: Idler arm, 2: Idler arm bracket, 2a: Bracket shaft section, 3: Idler bushing, 4: Cushion section, 5: Idler arm large boss section, 6: Washer, 7: Idler arm guide tube, 8: Nut , 10: Tapered portion, 12: Stepped portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A vehicle control device having a structure in which a resilient bush is attached to the sliding part of the idler arm shaft, and a torsional force is generated by the elastic deformation of the bush when the idler arm slides. In the idler arm bearing device, the vicinity of the base of the shaft portion of the idler arm bracket is formed into a tapered shape, and the idler arm guide tube with the bush attached to the outside is tightened with a nut to the shaft portion of the idler arm bracket, and at the same time, the shaft portion of the idler arm bracket is formed into a tapered shape. An idler arm bearing device for an automobile control device characterized by being press-fitted. (2) Utility model registration claim No. 1 in which the idler arm bracket has a stepped portion near the base of the shaft portion.
An idler arm bearing device for an automobile steering system as described in 2.