JPH0589950U - Center bearing of propeller shaft - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a center bearing for a propeller shaft that can absorb vibration due to flow resistance when liquid passes through an orifice and reduce vibration and noise transmitted to a vehicle body. A bearing case 23 having a ball bearing 24 fitted to a propeller shaft main body 21 and a bearing bracket 26 fixed to a vehicle body 29 via a cushion material 25 on the outer circumference of the bearing case 23. In the center bearing 22 of the propeller shaft body 21, the plurality of liquid chambers 30a and 30b in which the liquid 33 is enclosed are provided inside the cushion material 25, and these liquid chambers 30a and 30b are provided with the orifices 31 and 32, respectively.
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Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a center bearing of a propeller shaft that transmits a rotating torque from a vehicle transmission to a rear axle.

[0002]

[Prior Art]

 In the propeller shaft that transmits the rotational torque from the transmission to the rear axle, the propeller shaft for trucks is configured as shown in FIGS. 2 and 3.

That is, 1 is a propeller shaft main body, a yoke sleeve 2 is provided at one end of the propeller shaft main body, and a flange yoke 4 is provided on the yoke sleeve 2 via a spider 3.

A yoke 6 having a companion flange 5 is provided at the other end of the propeller shaft main body 1, and the yoke 6 is rotatably supported by a center bearing 7.

Explaining the center bearing 7, the yoke 6 is fitted into a bearing case 9 having a ball bearing 8, and a bearing bracket 11 is provided on the outer periphery of the bearing case 9 via a cushion material 10 such as rubber. It is fitted. A mounting piece 12 is integrally provided on the bearing bracket 11, and the mounting piece 12 is fixed to a vehicle body 14 by a bolt 13.

Therefore, the vibration generated by the rotation of the propeller shaft main body 1 can be absorbed by the cushion material 10 of the center bearing 7, and the vibration transmitted to the vehicle body 14 can be reduced.

[0007]

[Problems to be solved by the device]

 By the way, the center bearing 7 of the conventional propeller shaft has a structure that absorbs vibration by the elasticity of the cushioning material 10 such as rubber, and the damping characteristic of vibration is controlled by the thickness of the cushion material 10. There is a problem that if the wall thickness is made thin to improve the vibration efficiency, the durability is reduced, and if it is made thick, the vibration absorption rate is reduced, and it is difficult to control the vibration damping characteristics.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a durable center bearing for a propeller shaft, in which the vibration damping characteristics of the propeller shaft can be easily controlled. Especially.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is directed to a bearing case having a ball bearing fitted to a propeller shaft, and a bearing bracket fixed to the vehicle body on the outer circumference of the bearing case via cushioning material. In the center bearing of a propeller shaft that rotatably supports the propeller shaft, a plurality of liquid chambers filled with liquid are provided inside the cushion material, and these liquid chambers are communicated via an orifice. And

[0010]

[Action]

 When the cushion material is compressed by the vibration generated by the rotation of the propeller shaft, the liquid chamber on the compression side is pressed, and the liquid enclosed in the liquid chamber passes through the orifice to the other liquid chamber on the compressed side. The vibration is absorbed by the flow resistance at this time.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 21 is a propeller shaft main body, and 22 is a center bearing that rotatably supports the propeller shaft main body 21. The center bearing 22 will be described. Reference numeral 23 is a bearing case having a ball bearing 24 that rotatably supports the propeller shaft main body 21, and is formed in a cylindrical shape.

A cushion material 25 made of thick rubber is provided on the outer periphery of the bearing case 23, and a substantially U-shaped bearing bracket 26 is provided on the outer periphery of the cushion material 25 excluding the upper surface. Mounting pieces 27 bent outward are provided at both ends of the bearing bracket 26, and the bearing bracket 26 is fixed to a vehicle body 29 by bolts 28.

The cushion member 25 is provided with liquid chambers 30a and 30b each having a plurality of cavities of different sizes. The liquid chambers 30a and 30b communicate with each other through an orifice 31 penetrating the inside of the cushion member 25 and an orifice 32 formed of a concave groove provided on the inner peripheral surface of the bearing bracket 26.

Further, the large liquid chamber 30a is filled with a liquid 33 such as oil or water, and the small liquid chamber 30b is hollow. The liquid 33 can move from the large liquid chamber 30a to the small liquid chamber 30b via the orifices 31 and 32, and vice versa, from the small liquid chamber 30b to the large liquid chamber 30a.

According to the center bearing of the propeller shaft thus configured, the vibration generated by the rotation of the propeller shaft main body 21 is transmitted to the bearing case 23 via the ball bearing 24. Since the bearing case 23 is elastically supported by the cushion material 25, the vibration of the bearing case 23 is absorbed by the cushion material 25.

Further, when the cushion material 25 is pressed in one direction by the bearing case 23, the cushion material 25 is compressed and the liquid chamber 30a on the compression side is also compressed. Therefore, the liquid 33 sealed in the liquid chamber 30a is also pressed and guided to another liquid chamber, that is, the liquid chamber 30b on the compressed side via the orifices 31 and 32. At this time, vibration can be absorbed by the flow resistance when the liquid body 33 passes through the orifices 31 and 32, and the vibration and noise transmitted to the vehicle body 29 can be reduced.

The damping characteristic of vibration can be arbitrarily set according to the sizes of the liquid chambers 30a and 30b, the diameters and lengths of the orifices 31 and 32, and the viscosity of the liquid 33, so that the damping characteristic can be easily controlled. be able to.

[0019]

[Effect of the device]

 As described above, according to the present invention, the bearing bracket is provided on the outer periphery of the bearing case through the cushion material, and a plurality of liquid chambers in which liquid is sealed are provided inside the cushion material. It is characterized in that the chambers are communicated with each other through an orifice.

Therefore, the vibration can be absorbed by the flow resistance when the liquid passes through the orifice, and the vibration and the noise transmitted to the vehicle body can be reduced. Further, the damping characteristic of vibration can be arbitrarily set according to the size of the liquid chamber, the diameter and length of the orifice, and the viscosity of the liquid body, and the damping characteristic can be easily controlled.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a center bearing of a propeller shaft according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a center bearing of a conventional propeller shaft.

FIG. 3 is a perspective view of the center bearing.

[Explanation of symbols]

21 ... Propeller shaft main body, 22 ... Center bearing, 23 ... Bearing case, 24 ... Ball bearing, 25 ... Cushion material, 26 ... Bearing bracket, 29 ... Car body, 30a, 30b ... Liquid chamber, 31, 32 ...
Orifice, 33 ... Liquid.

Claims (1)

[Scope of utility model registration request] 1. A propeller shaft comprises a bearing case having a ball bearing fitted to a propeller shaft, and a bearing bracket provided on the outer periphery of the bearing case and fixed to a vehicle body via a cushioning material. A center bearing for a propeller shaft, wherein a center bearing of a propeller shaft that is freely supported is provided with a plurality of liquid chambers filled with liquid inside the cushion material, and these liquid chambers communicate with each other through an orifice.