JPH032032Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a torsional damper that absorbs torsional vibration of a rotating shaft of a device.

[Conventional technology]

Conventionally, as the above-mentioned torsional damper, as shown in FIG. 2, a rubber-like elastic body d is bonded between a sleeve c and a vibrating ring e arranged concentrically on the outside thereof, and the inner periphery of the sleeve c is By fitting into the hub b fixed to the rotating shaft a, the hub b and the vibration ring e are elastically coupled, and the elasticity of the elastic body d is used to damp the torsional vibration of the rotating shaft a. As shown in Fig. 3, a pair of discs e',
Friction rings f, f between the opposing end faces of e' and a hub b' which is located between the two disks e', e' and is fixed to the rotating shaft a'.
is slidably clamped, and the pressing force of the spring members h, h compressed by the bolts and nuts g is applied to the sliding surfaces of the friction ring f, hub b', and disc e'. There are some that apply a frictional force and use the frictional force to damp torsional vibrations of the rotating shaft a'.

[Problem that the invention attempts to solve]

However, among these dampers, the former with the configuration shown in Figure 2 relies only on the elasticity of the elastic body d for its vibration-absorbing action, so there is a limit to its vibration damping ability, and the latter with the configuration shown in Figure 3 The problem is that things have complex structures.

The present invention was devised to address these circumstances and to provide a torsional damper that has a relatively simple structure and exhibits excellent vibration damping force.

[Means for solving problems]

In order to solve the above-mentioned problems, the torsional damper according to the present invention includes a hub provided with a cylindrical part, and an annular rubber-like elastic body externally fitted at a required location of the cylindrical part. a fixed vibrating ring, a pair of opposing end surfaces are set on the hub and the vibrating ring, a friction ring is slidably inserted between the opposing end surfaces, and the friction ring is provided on these sliding portions. It is characterized by applying frictional force through the elasticity of a rubber-like elastic body.

[Effect]

The torsional damper of the present invention having the above configuration not only generates a damping force using the elasticity of the rubber-like elastic body that accompanies the swinging of the vibration ring, but also uses the friction force of the friction ring that is in sliding contact with the opposing end surfaces of the hub and the vibration ring. Since the auxiliary damping force (frictional force) is provided by the axial elasticity of the elastic body, its size is determined by the fit of the rubber-like elastic body into the cylindrical part. It can be set arbitrarily by adjusting the location in the axial direction.

〔Example〕

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

Reference numeral 2 denotes a hub externally fixed to the rotating shaft 1 in the shaft hole 3, 4 a vibration ring disposed coaxially with the hub 2, and 5 attached to the outer circumferential surface 2a of the inner cylindrical body portion 2' of the hub 2. A rubber-like elastic body 7 is vulcanized and bonded between the externally fitted sleeve 6 and the inner diameter surface 4a of the vibrating ring 4, and elastically connects the hub 2 and the vibrating ring 4. This is a friction ring made of a resin material that is slidably and rotatably interposed between the mutually opposing end surfaces 2b and 4b of the ring 4.

That is, in this embodiment, in addition to the damping force utilizing the elasticity of the rubber-like elastic body 5, there is an auxiliary damping force due to the frictional resistance of the friction ring 7. sliding parts 8, 9
The surface pressure for applying a frictional force to the sleeve 6 is obtained by the shear spring force in the axial direction of the rubber-like elastic body 5, and its magnitude is determined between the outer circumferential surface 2a of the cylindrical portion of the hub 2 and the sleeve 6. The relative fitting position in the axial direction of the sleeve 6 can be arbitrarily set, specifically, by the amount by which the sleeve 6 is pushed in the direction of the arrow X. Further, reference numerals 10 and 11 are dust seals that are protruded from the outer diameter portions of the opposing end surfaces 2b and 4b, respectively, and that slide closely against each other, thereby preventing foreign matter, liquid, etc. from entering the sliding portions 8 and 9. It is possible to maintain a stable frictional force (auxiliary damping force) by preventing this.

Note that the sliding end surface of the friction ring 7 made of resin material is as follows.
Durability can be improved by induction hardening and tuftlite treatment.Furthermore,
In addition to this resin material, suitable materials for the friction ring 7 include a refractory composite sintered body (cermet), a semi-metallic material, and the like.

[Effect of idea]

As is clear from the above explanation, the torsional damper of the present invention has both a damping function that utilizes the elasticity of a rubber-like elastic body and an auxiliary damping function that utilizes the frictional force of the friction ring. By simply adding this structure, the damping ability against torsional vibration of the rotating shaft can be improved. The frictional force of the friction ring is provided by the elasticity of the rubber-like elastic body, and no other pressing means is required, and the fitting position of the rubber-like elastic body with respect to the cylindrical portion can be adjusted in the axial direction. This allows the frictional force to be set to an arbitrary magnitude.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing an embodiment of the torsional damper of the present invention, and FIGS. 2 and 3 are half-cut sectional views showing conventional torsional dampers. 1... Rotating shaft, 2... Hub, 2'... Cylindrical part,
2a...outer circumferential surface, 2b, 4b...end face, 3...shaft hole, 4...vibration ring, 4a...inner circumferential surface, 5...
Rubber-like elastic body, 6...Sleeve, 7...Friction ring, 8, 9...Sliding part, 10, 11...Dust seal.

Claims (1)

[Scope of utility model registration request] A hub 2 provided with a cylindrical body 2', and an annular rubber-like elastic body 5 externally fitted onto the cylindrical part 2' at required locations.
and a vibration ring 4 fixed to the outer diameter side of the rubber-like elastic body 5, a pair of opposing end surfaces 2b and 4b are set on the hub 2 and the vibration ring 4, and the opposing end surface 2b , 4b. A torsional damper characterized in that a friction ring 7 is slidably interposed between the members 8 and 4b, and a frictional force is applied to these sliding parts 8 and 9 by the elasticity of the rubber-like elastic body 5.