JPH0325454Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dynamic vibration absorber that absorbs and suppresses vibrations generated in various rotary drive systems.

[Conventional technology]

Conventionally, as a type of vibration absorber that absorbs vibrations generated in the drive system of an automobile, for example, as shown in FIGS. It is known that a vibrating ring b is arranged concentrically and spaced apart, and the hub a and the vibrating ring b are connected by a rubber member c. In addition to a portion c1 that connects the hub a and the vibration ring b, the rubber member c has a protruding portion c2 on the outer circumferential side of the hub a.
are integrally molded in an alternating and evenly spaced pattern.

[Problem that the invention attempts to solve]

The above-mentioned vibration absorber absorbs vibrations in the torsional direction (rotational direction) generated in the propeller shaft of an automobile drive system by fitting a hub a to the propeller shaft of the vehicle, etc. Due to the action of the force, the vibration ring b becomes largely eccentric with respect to the hub a, that is, the center of rotation, in a certain rotational speed range, resulting in the problem of generating new vibrations and noise. The above-mentioned vibration absorber is equipped with the above-mentioned protruding portion c2 to suppress this eccentricity, but since the parts are inserted into a vulcanization mold, it is not possible to set a small gap between the hub a and the vibration ring b, and the gap between the hub a and the vibration ring b cannot be set small. Since the configuration includes the large protrusion c2 made of rubber material, there remains the problem that the material cannot function satisfactorily against eccentricity, and a new solution is desired.

[Means for solving problems]

In view of the above points, the present invention was made with the purpose of suppressing the eccentricity of the vibrating ring and eliminating problems such as generation of vibration and noise due to the eccentricity.To achieve this purpose, the vibrating ring is formed in an annular shape. The inner circumferential surface of the hub and the outer edge corner of the square hub are slidably abutted, and the outer edge corner is coated with a lubricant.

[Effect]

That is, in the vibration absorber of the present invention, the outer edge corner of the square-shaped hub slides into contact with the inner peripheral surface of the vibration ring to restrict the radial movement of both members. The coated lubricant reduces sliding resistance during sliding.

〔Example〕

Next, the present invention will be explained in more detail with reference to the drawings.

As shown in FIGS. 1 and 2, the hub 1 has a shaft hole 1a in the center through which a propeller shaft (not shown) is inserted, and has a substantially L-shaped cross section (FIG. 2). The outer edge corner portions 1b of the four corners are slidably abutted on the inner circumferential surface 2a of the annular vibration ring 2. Each outer edge corner 1b is rounded to an extent that does not inhibit this sliding motion, and is coated with a lubricant 4 such as Teflon to further smooth the sliding motion. The hub 1 and the vibration ring 2 are connected by four equally spaced rubber members 3.

The vibration absorber having the above configuration includes the outer edge corner portion 1b of the hub 1...
... is always kept in contact with the inner circumferential surface of the vibrating ring 2 to suppress eccentricity of the vibrating ring 2 during operation, and each outer edge corner 1b is coated with a lubricant 4 to prevent sliding during sliding. Since the resistance is kept low, smooth sliding is ensured and the natural torsional movement of the vibration absorber is not inhibited. A slight gap may be set between each outer edge corner portion 1b and the inner circumferential surface of the vibration ring 2, if necessary.

[Effect of idea]

The dynamic vibration absorber of the present invention has the following effects due to the above structure and operation.

A: The inner circumferential surface of the annular vibration ring and the outer edge corner of the square hub are slidably in contact with each other, and both members are always positioned concentrically, which prevents vibration and noise from occurring due to eccentricity of both members. This can be prevented.

B: The outer edge corners of the hub are coated with a lubricant to reduce the sliding resistance during sliding, ensuring smooth sliding and preventing the occurrence of seizure due to metal-to-metal sliding.
The coating is an adhering means that prevents the lubricant from peeling off due to sliding, and therefore the effect of B can be maintained for a long period of time.

[Brief explanation of drawings]

FIG. 1 is a half-cut front view of a dynamic vibration absorber according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a half-cut front view of a dynamic vibration absorber according to a conventional example. FIG. 4 is a sectional view taken along the line BB in FIG. 3. 1... Hub, 1a... Shaft hole, 1b... Outer edge corner, 2... Vibration ring, 2a... Inner peripheral surface, 3...
Rubber member, 4... Lubricating material.

Claims (1)

[Scope of utility model registration request] In a dynamic vibration absorber in which a hub 1 attached to a rotating member of a drive system and a vibration ring 2 arranged concentrically around the outer periphery of the hub 1 are connected via a rubber member 3, an annular vibration ring is used. A dynamic vibration absorber characterized in that an inner circumferential surface 2a of a hub 1 and an outer edge corner 1b of a square hub 1 are slidably abutted, and a lubricant 4 is coated on the outer edge corner 1b. .