JPH0643544Y2 - Elastic joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an elastic joint structure of a propeller shaft, and more particularly to a technical means for preventing vibration transmission.

(Prior Art) An elastic joint as shown in FIG. 4 is used as a kind of joint of a propeller shaft for transmitting power generated by an engine to a rear axle. This elastic joint includes a yoke portion 104 of a propeller shaft 102 and a mating member 106 (here, a sleeve of a slip joint) in a mounting hole of a rubber coupling 100.
The yoke portions 108 are fixed to each other to connect the propeller shaft 102 and the sleeve 106 to each other. The elastic action of the rubber coupling 100 can reduce vibration and reduce impact load applied to the drive system. It has the features of

(Problems to be Solved by the Invention) By the way, this elastic joint is provided with a centering mechanism so that the shaft centers of the propeller shaft 102 and the sleeve 106 are aligned with each other. There was a problem that the vibration was transmitted in. That is, in the example of FIG. 4, a self-aligning bearing 110 is provided on the sleeve 106 side, and an alignment shaft 112 is provided on the other propeller shaft 102 side.
2 is slidably fitted in the fitting hole of the self-aligning bearing 110 so that the shaft centers of the propeller shaft 102 and the sleeve 106 are aligned with each other. When a force is applied in the radial direction due to the deviation during mounting or the action of load during use, etc., the surface pressure of the mating surface between the centering shaft 112 and the self-aligning bearing 110 increases, and Sliding resistance increases, and vibration is transmitted from the sleeve 106 side to the propeller shaft 102 side through the centering mechanism portion.

(Means for Solving the Problems) The present invention has been made to solve such problems, and its gist is to connect a propeller shaft to a mating member via a rubber coupling and An elastic joint structure in which a centering shaft is fixedly installed on one side and a bearing including an outer ring and an inner ring is fixedly installed on the other side, and the centering shaft is slidably fitted in a fitting hole of the bearing. In the bearing, a cylindrical elastic body layer is fixedly formed on the inner peripheral surface side of the inner ring of the bearing, and a lubricating layer different from the elastic body is further formed on the inner peripheral surface side of the elastic body layer. The centering shaft is slidably fitted on the fitting surface with the inner surface of the lubricating layer as the fitting surface.

(Operation and Effect of Invention) In the elastic joint structure of the present invention, when a radial force is applied to the alignment mechanism portion between the propeller shaft and the mating member, the elastic deformation of the elastic layer in the bearing causes the alignment. An increase in surface pressure on the fitting surface (sliding surface) between the shaft and the bearing is suppressed. Moreover, since the lubricating layer is formed on the inner peripheral surface side of the elastic layer and the centering shaft is fitted to the inner surface of the lubricating layer, that is, the sliding resistance between the bearing and the centering shaft is reduced. Since they are suppressed to a low level and they can smoothly move relative to each other in the axial direction, even if a force is applied in the radial direction in the centering mechanism section, the axial vibration of the propeller shaft or the mating member is well blocked and Directional vibrations, etc. are effectively prevented from being transmitted from one to the other or vice versa.

In the present invention, the lubricating layer formed on the inner peripheral surface side of the elastic layer also has a function of protecting the elastic layer.

That is, when the centering shaft is directly fitted to the inner peripheral surface of the elastic body layer, the elastic body layer is easily worn and damaged due to the relative movement of the two, but there is an advantage that this is suppressed because of the lubricating layer. Be done.

(Example) Next, the Example of this invention is described in detail based on drawing.

In FIG. 1, 10 and 12 are sleeves of a propeller shaft and a slide joint, which have yoke portions 14 and 16, respectively, and these yoke portions 14 and 16 are connected to each other via a rubber coupling 18. The rubber coupling 18 has a ring shape as a whole as shown in FIG.
A reinforcing yarn bundle 20 is embedded inside. Further, a plurality of mounting holes 22 are provided at predetermined intervals along the circumferential direction, and the yoke portions 14 and 16 of the propeller shaft 10 and the sleeve 12 are alternated by bolts 24 and nuts 26 in the mounting holes 22. It is fixed to.

A bearing (self-aligning bearing) 30 is fixed to the end of the sleeve 12. The bearing 30 includes an outer ring 32 and an inner ring 34 as shown in detail in FIG. The outer ring 32 and the inner ring 34 have spherical fitting portions 36 and 38, respectively, and the outer ring 32 and the inner ring 3 are fitted to the fitting surfaces 36 and 38, respectively.
4 are slidably fitted together. That is, the inner ring 34
The fitting surfaces 36 and 38 are rotatably held by the outer ring 32.

A cylindrical rubber elastic body layer 40 is fixed and formed on the inner peripheral surface side of the inner ring 34, and a lubricating layer 42 made of tetrafluoroethylene fiber is further formed on the inner peripheral surface side of the rubber elastic body layer 40. Are formed.

On the other hand, on the side of the propeller shaft 10, a centering shaft 44 is fixedly mounted on the end member 46, and the centering shaft 44 is slidably fitted to the inner peripheral surface of the lubricating layer 42, With sleeve
12 and propeller shaft 10 are being aligned.

The rubber elastic layer 40 and the lubrication layer 42 in the bearing 30
Can be specifically formed as follows.
That is, it is easy to fabricate a two-layer structure having an inner layer of tetrafluoroethylene fiber and an outer layer of fiber that adheres to rubber such as polyester, which is wound around a predetermined core body and vulcanization mold together with the bearing 30. For example, a rubber material may be set inside and injected from an injection port 48 formed in the bearing 30 to be molded, and then the molded body may be taken out of the mold and the core body may be extracted from the molded product.

In the elastic joint of the present example configured as described above, in the centering portion between the sleeve 12 and the propeller shaft 10,
Specifically, when a radial force acts on the fitting portion of the bearing 30 on the sleeve 12 side and the centering shaft 44 on the propeller shaft 10 side, the rubber elastic layer of the bearing 30 is applied.
The elastic deformation of 40 suppresses an increase in the surface pressure of the fitting surface between the centering shaft 44 and the bearing 30. Also, the bearing 30 and the centering shaft 44
Since the lubricating layer 42 of ethylene tetrafluoride fiber is formed in the fitting portion with and the sliding resistance is suppressed as low as possible, the vibration due to the sliding resistance between the bearing 30 and the centering shaft 44 is suppressed. Transmission is suppressed.

Although the embodiments of the present invention have been described in detail above, the present invention can be configured in other forms.

For example, instead of the rubber elastic layer formed on the inner peripheral surface side of the inner ring of the bearing, it is possible to form an elastic layer of resin, and the lubricating layer is a tetrafluoroethylene resin other than tetrafluoroethylene fiber. It is also possible to form the same material.

In addition, the above example is an example in which the present invention is applied to an elastic joint that connects a propeller shaft and a sleeve, but the present invention should be applied to an elastic joint that connects a propeller shaft and a differential device. It is also possible to configure in a form in which various changes are made without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an elastic joint structure which is an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of an essential part of FIG. 1, and FIG. 3 (A) is a rubber coupling in FIG. Front view of the
FIG. 3B is a sectional view taken along the line IIIB-IIIB in FIG.
The figure is a cross-sectional view of a conventional elastic joint structure. 10 …… Propeller shaft 12 …… Sleeve 18 …… Rubber coupling 30 …… Bearing 32 …… Outer ring, 34 …… Inner ring 40 …… Elastic layer, 42 …… Lubrication layer

Claims (1)

[Scope of utility model registration request] 1. A propeller shaft is connected to a mating member via a rubber coupling, a centering shaft is fixed to one of the propeller shafts, and a bearing including an outer ring and an inner ring is fixed to the other of the propeller shafts. In an elastic joint structure in which the centering shaft is slidably fitted in a fitting hole, a cylindrical elastic layer is fixed and formed on the inner peripheral surface side of the inner ring of the bearing, and A lubricating layer, which is different from the elastic body, is formed on the inner peripheral surface side of the elastic body layer, and the centering shaft is slidably fitted on the fitting surface with the inner surface of the lubricating layer as the fitting surface. An elastic joint structure for a propeller shaft, characterized in that they are made to fit together.