JP2605585Y2 - Coupling - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a coupling. The coupling of the present invention is widely used for a supercharger, an alternator or a transmission.

[0002]

2. Description of the Prior Art Known couplings of this kind are, for example,
As disclosed in Japanese Utility Model Publication No. 64-6408, a rotation stopper is provided to prevent the elastic body from being excessively deformed and damaged.

[0003]

In this type of coupling, the spring constant of the elastic body should basically be set small in order to improve the vibration isolation. However, if the spring constant of the elastic body is set to be small, the rotation stopper will vigorously hit during operation, and there is a problem that a loud contact noise is generated. Therefore, in the related art, the spring constant of the elastic body cannot be reduced so much, and the vibration proof property is insufficient.

[0004]

This invention SUMMARY OF THE INVENTION In view of the above points, which has been devised to solve the problems found in the prior art, in order to achieve this object, Bear boss
Connect the rotating ring via the ring, and connect to the rotating ring
Pulley grooves or gear teeth are provided, and the first elastic body is
Connecting the sleeve to the first elastic body,
Connected to the second elastic body, and the second elastic body
Connected to the ring, the sleeve and the boss have a predetermined relative
A first rotation stopper that engages with angular displacement is provided,
Engages with the rotating ring at a predetermined relative angular displacement
A second rotation stopper is provided, and a spring constant of the first elastic body and
The spring constants of the second elastic body are made different from each other,
The stopper projections provided on the first
And one of the contact parts of the second rotation stopper
A coupling is provided.

[0005]

[0006]

In the coupling of the present invention having the above-mentioned structure, the elastic body having the smaller spring constant mainly exerts vibration damping action, and the elastic body having the larger spring constant mainly reduces the contact noise of the rotation stopper. It has the effect of doing. The elastic body with the larger spring constant can reduce the contact noise of the rotation stopper,
This is because the speed at the time of contact of the rotation stopper is low because the spring constant is large, and depending on the case (condition), the spring constant may be such that the angular displacement stops before the rotation stopper comes into contact. On the other hand, the other rotation stopper operates according to the deformation of the elastic body having the smaller spring constant. However, since the other rotation stopper operates when the input is small, the contact noise is originally small.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

As shown in FIGS. 1 to 4 , a rotary ring 23 is rotatably connected to the outer peripheral side of the boss 21 via a bearing 22. A pulley groove 23a is provided on the outer peripheral surface of the rotary ring 23. I have. The type of the bearing 22 is not particularly limited, and may be any metal, Du, resin, ball, needle, or the like. The rotating ring 23 may be provided with gear teeth (not shown) instead of the pulley groove 23a. In some cases, the boss 21 is provided with gear teeth (not shown).

A required number of protrusions 21a are provided on the outer peripheral surface of the boss 21.
Are provided in a state of being arranged in the circumferential direction, and a required number of protrusions 23b are provided on the inner peripheral surface of the rotating ring 23 alternately with the protrusions 21a in the circumferential direction.

A first elastic body 26 made of a rubber-like elastic material is connected to the boss 21 via an inner peripheral sleeve 25, and a sleeve 27 is connected to the outer peripheral side of the first elastic body 26.
A second elastic body 28 made of a rubber-like elastic material is connected to the outer peripheral side of 7, and the second elastic body 28 is connected to the rotating ring 23 via an outer peripheral side sleeve 29. Three sleeves 25, 2
This laminated product composed of 7, 29 and the two elastic bodies 26, 28 is vulcanized and formed integrally in advance, and then fitted together between the boss 21 and the rotating ring 23.

A required number of stopper projections 27a are provided on one end side in the axial direction of the sleeve 27 in a state of being arranged in the circumferential direction, and are inserted between the adjacent projections 21a and 23b. Stopper projection 27a and projection 21a
The combination, the sleeve 27 and the boss 21, the first rotation stopper 24 is provided which engages in a predetermined relative angular displacement theta _3, by a combination of the stopper projection 27a projecting 23b, the sleeve 27 rotates ring 23 second rotational stopper 30 which engages at a predetermined relative angular displacement theta ₄ is provided. The operation angle θ ₄ of the second rotation stopper 30 is set smaller than the operation angle θ ₃ of the first rotation stopper 24, and the spring constant of the first elastic body 26 is
8 is set smaller than the spring constant.

In the coupling having the above configuration,
When a torque is input to the boss 21, the torque is transmitted to the rotating ring 23 via the inner sleeve 25, the first elastic body 26, the sleeve 27, the second elastic body 28, and the outer sleeve 29. In addition, when vibration to be absorbed occurs, the first elastic body 26 having a smaller spring constant is largely elastically deformed and effectively absorbs the vibration. First elastic body 2
When 6 is elastically deformed, the sleeve 27 and the boss 21 is angularly displaced relative, this angular displacement reaches a predetermined value theta _3, the first rotary stopper 24 contacts the stopper projection 27a and the projection 21a is to operate. When the first rotation stopper 24 is operated, the angular displacement of the sleeve 27 and the boss 21 is stopped, and the elastic deformation of the first elastic body 26 is stopped.
6 can be prevented from being further elastically deformed and damaged. After the first rotation stopper 24 is actuated, the second elastic body 28 continues to be elastically deformed. However, since the second elastic body 28 has a large spring constant, the boss 21 and the rotating ring 2
The angular displacement of 3 is continued with a slow shade (see FIG. 4 ). When the angular displacement between the boss 21 and the rotating ring 23 reaches a predetermined value (θ ₃ + θ ₄ ), the stopper projections 27a and the projections 3b come into contact, and the second rotation stopper 30 operates. The magnitude of the contact sound at this time is small because the angular displacement between the boss 21 and the rotating ring 23 is a slow speed. On the other hand, the magnitude of the contact sound of the first rotation stopper 24 that has been operated earlier is originally small since this operation is performed when the input is small. Therefore, according to the coupling having the above configuration, the vibration is effectively absorbed by the first elastic body 26 having a small spring constant, and then the first and second rotation stoppers 2 are formed.
By operating the steps 4 and 30 stepwise, the contact noise at the time of operating the stopper can be reduced. If the sleeve 27 is made of resin instead of metal, the contact noise of the second rotation stopper 30 can be further reduced.

The operating angle θ ₃ of the first rotary stopper 24
There magnitude of operating angle theta ₄ of the second rotary stopper 30 may be reversed, and in opposition magnitude magnitude of the spring constant of the spring constant and the second elastic body 28 of the first elastic member 26 when May be.

[0020]

[Effects of the Invention] The present invention has the following effects. Ie
First, vibration is effectively absorbed by an elastic body having a small spring constant , and then the first and second rotation stoppers are operated in a stepwise manner. Sound can be reduced. In addition, the sleeve and the boss make the first rotary storage
Is formed and the sleeve and rotating ring
The second rotation stopper is formed by the
Topper protrusions are first and second rotation stoppers
The following work
It is possible to achieve the effect. Double rotation stopper
Each one of the abutment parts is composed of separate parts
The number of parts can be reduced compared to
Wear. When designing or manufacturing the coupling,
Change the shape or size of the probe or stopper projection
By means of the first rotation stopper and the second rotation stopper
It is possible to change all the operating angles of the
In addition, it is easy to adjust the operating angles of the two rotation stoppers.
Also, both rotation stoppers can be arranged on the same circumference.
Possible to reduce the size of the coupling or save space.
Can be realized.

[Brief description of the drawings]

1 is a half sectional view of a coupling according to an embodiment of the present invention cut in parallel to an axis, and is a sectional view taken along line EE in FIG. 3;
Line cross section

FIG. 2 is a half cut sectional view of the coupling cut in parallel with an axis, and is a sectional view taken along line FF in FIG. 3;

FIG. 3 is a cross-sectional view of a main part obtained by cutting the coupling at right angles to an axis, and is a cross - sectional view taken along line DD in FIG. 1;

FIG. 4 is a graph showing operating characteristics of the coupling.

[Description of Signs] 21 Boss 21a Projection 22 Bearing 23 Rotating Ring 23a Pulley Groove 23b Projection 24 First Rotation Stop 25 Inner Sleeve 26 First Elastic Body 27 Sleeve 27a Stopper Projection 28 Second Elastic Body 29 Outer Sleeve 30 Second rotation stopper

Continuation of the front page (56) References JP-A-1-126433 (JP, A) JP-A-4-231175 (JP, A) JP-A-3-17460 (JP, U) JP-A-6-45132 (JP , U) Japanese Utility Model Hei 5-75544 (JP, U) Japanese Utility Model Sho 62-69647 (JP, U) Japanese Utility Model Sho 62-199551 (JP, U) Japanese Utility Model Sho 60-123444 (JP, U) Japanese Utility Model 56-25658 (JP, U) Japanese Utility Model Showa 62-174136 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 3/12 F16H 55/36 F16F 15/126

Claims (1)

(57) [Scope of request for utility model registration] A rotating ring (23) is connected to a boss (21) via a bearing (22), and said rotating ring (2) is connected to said boss (21).
3) a pulley groove (23a) or a gear tooth is provided; a first elastic body (26) is connected to the boss (21); a sleeve (27) is connected to the first elastic body (26); A second elastic body (28) is connected to (27), the second elastic body (28) is connected to the rotating ring (23), and a predetermined relative angle is formed between the sleeve (27) and the boss (21). A first rotation stopper (24) that engages at a displacement (θ ₃ ), and a second rotation stopper (24) that engages the sleeve (27) and the rotation ring (23) at a predetermined relative angular displacement (θ ₄ ). 30) provided that the spring constant of the first elastic body (26) and the spring constant of the second elastic body (28) are different from each other.
And a stopper projection (27) provided on the sleeve (27).
a) is the first rotary stopper (24) and the second rotary stopper.
Be sure to also serve as one of the contact parts in the topper (30).
And a coupling characterized by: