JPH0529374Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a centering bush that is attached to a connecting portion between a propeller shaft and an output shaft of a transmission.

[Conventional technology]

Conventionally, as shown in Fig. 3, a yoke b fixed to the end of the propeller shaft a is attached to the connecting portion between the propeller shaft a and the output shaft c of the transmission.
A flexible coupling f and a centering bush g, which are formed by elastically coupling a yoke e spline-fitted to the end of the output shaft c, are attached.

This centering bush g consists of an outer sleeve 1 that is fitted and fixed to the inner periphery of a yoke b at the end of the propeller shaft a, and a centering shaft d that is located on the inner periphery of the outer sleeve 1 and is located at the end of the output shaft c.
The inner sleeve 2 is slidably fitted onto the outer sleeve 2.
and an elastomer 3 bonded between the outer sleeve 1 and the inner sleeve 2, and a cavity 10 on the inner circumference of the outer sleeve 1 is filled with grease (for lubrication between the sliding surfaces of the inner sleeve 2 and the centering shaft d). (not shown) is filled. 4 is a seal lip formed at the end of the elastomer 3 on the side opposite to the cavity 10 to prevent foreign matter from entering between the sliding surfaces and leakage of grease from the sliding surfaces to the outside; This is a partition wall for preventing grease from flowing out from the centering shaft 10, and a vent hole 12 is bored in the center to allow air to flow as the centering shaft d is displaced in the axial direction.

[The problem that the idea aims to solve]

When assembling the connection between the propeller shaft a and the output shaft c of the transmission, the centering shaft d at the end of the output shaft c is aligned with the axis of the centering bush g fixed to the propeller shaft a side. As a condition, the centering shaft d is inserted into the inner peripheral hole of the centering bush g, that is, the inner periphery of the seal lip 4 and the sleeve 2. However, in actual work on an automobile assembly line, the above-mentioned centering is almost done blindly. As a result, when the centering shaft d is inserted, the seal lip 4 may be turned over or damaged, or the garter spring 5 attached to the outer circumferential surface of the seal lip 4 may come off, or other problems may occur. Sometimes I put it away.

[Means to solve the problem]

In view of the above points, the present invention has been devised to solve the problems seen in the above-mentioned prior art.
To achieve this purpose, an outer sleeve fixed to the propeller shaft and an inner sleeve arranged on the inner circumference side of the outer sleeve and slidably fitted on the outer circumference of the centering shaft are connected via an elastomer. In the centering bush, a centering bush is provided with a seal lip arranged axially with the inner sleeve on the inner circumferential side of the outer sleeve and slidably contacts the outer circumference of the centering shaft; An annular cap is fixed to the end, and an elastomer annular guide cover is provided on the inner peripheral side of the cap.

[Effect]

In the centering bush of the present invention having the above-mentioned configuration, the guide cover performs a guiding action, so that the centering shaft can be easily inserted into the seal lip and the inner periphery of the inner sleeve. Furthermore, since this guide cover is made of an elastomer having appropriate elasticity, the centering shaft does not pry the inner circumferential surface of the inner sleeve using the inner circumferential end of the guide cover as a fulcrum when inserting the centering shaft or during actual machine operation.

〔Example〕

Hereinafter, the centering bush according to the present invention will be explained based on the drawings.

Incidentally, the same parts as those of the conventional one shown in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted.

That is, as shown in FIG. 1, a metal annular cap 6 having a substantially L-shaped cross section is fitted to the end of the outer sleeve 1 on the side where the seal lip 4 is provided, and an elastomer is attached to the inner circumferential side of the cap 6. An annular guide cover 8 made of 100% is vulcanized and bonded. The guide cover 8 has an inner diameter slightly larger than the outer diameter of the centering shaft d, and is formed into a tapered shape with its inner peripheral end directed slightly outward.

In the above configuration, the annular guide cover 8 has a suitably thick wall and is inclined so as to protrude outward in the axial direction, so that when the centering shaft d is inserted into the seal lip 4 and the inner sleeve 2, When it interferes with the shaft d, the annular guide cover 8 is bent toward the arrow A side in the figure, its rigidity increases, and guides the centering shaft d toward the inner circumference. Therefore, if the tip of the centering shaft d gets caught on the seal lip 4 during the insertion, the seal lip 4 may be turned over or damaged, or the garter spring 5 that tightens the seal lip 4 from the outer periphery should come off. It has a sufficient guide function to prevent any troubles that may occur.

Also, during operation, when the centering shaft d inserted through the inner sleeve 2 receives an input in the prying direction and contacts the guide cover 8, since the guide cover 8 is inclined outward, the centering shaft d It flexibly bends toward the arrow B side in the figure due to the load. Therefore, the lever movement of the centering shaft d using the annular guide cover 8 as a fulcrum does not occur, and the inner sleeve 2 is not subjected to an excessive load due to the lever movement of the centering shaft d. In addition to the shape shown in FIG. 1, the annular guide cover 8 may have various shapes such as a U-shaped or triangular cross section. Further, as shown in FIG. 2, the inner diameter may be set slightly smaller than the outer diameter of the centering shaft d.

[Effect of idea]

The present invention has the following effects. In other words, since the guide cover performs a guiding action, the centering shaft can be easily inserted into the inner periphery of the seal lip and inner sleeve, and since the guide cover is made of an elastomer with appropriate elasticity, it is easy to insert the centering shaft when inserting the centering shaft. It is possible to prevent the centering shaft from prying the inner circumferential surface of the inner sleeve using the inner circumferential end of the guide cover as a fulcrum during actual machine operation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a first embodiment of the centering bush of the present invention, FIG. 2 is a cross-sectional view of the second embodiment, and FIG. 3 is a cross-sectional view showing the entire centering bush mounting portion. 1... Outer sleeve, 2... Inner sleeve, 3... Elastomer, 4... Seal lip, 5... Garter spring, 6... Cap,
8... Guide cover, d... Centering shaft (shaft).

Claims (1)

[Scope of utility model registration request] An outer sleeve 1 fixed to the propeller shaft a and an inner sleeve 2 arranged on the inner circumferential side of the outer sleeve 1 and slidably fitted on the outer circumference of the centering shaft d are connected via an elastomer 3. , the outer sleeve 1
In the centering bush, a seal lip 4 is provided on the inner circumferential side of the outer sleeve 1, and the seal lip 4 is arranged in the axial direction with the inner sleeve 2 and slidably contacts the outer circumference of the centering shaft d. A centering bush characterized in that an annular cap 6 is fixed to an end thereof, and an elastomer annular guide cover 8 is provided on the inner peripheral side of the cap 6.