JPH0988992A - Coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any damage to an elastic body and noise in auxiliaries from occurring by reducing the extent of vibro-transmissibility in time of engine starting. SOLUTION: This coupling is contacted to a contact surface part 1a installed at the side of a boss 1 in time of engine starting via a second elastic body 9 at the inner circumferential side of a pulley 3, while in the rotational area of more than the idling speed, it moves outward in the radial direction by dint of centrifugal force, and thus it is made to connect a mass 10 separate from the contact surface part 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling that absorbs rotational fluctuations of an engine or a shaft and supplies stable torque to an auxiliary machine such as a compressor.

[0002]

2. Description of the Related Art Conventionally, there has been known a coupling in which a pulley is rotatably arranged on the outer peripheral side of a boss via a bearing and the boss and the pulley are connected via an elastic body made of a rubber-like elastic material. ing.

However, in this conventional coupling, a rubber-like elastic material having a low damping and a low spring is used as a material of the elastic body so as to prevent the vibration input from the pulley from being transmitted to the boss side.

Therefore, according to this coupling, a large resonance phenomenon may occur at the time of starting the engine when a low frequency and large amplitude is input, and as a result of this, the boss and the pulley largely rotate relative to each other. There is a problem in that the elastic body is damaged, or a large vibration is transmitted to the auxiliary machine, which causes abnormal noise in the auxiliary machine.

[0005]

SUMMARY OF THE INVENTION In view of the above points, the present invention reduces the vibration transmissibility at the time of starting the engine as compared with the prior art, thereby damaging the elastic body or generating abnormal noise in the auxiliary machine. It is an object of the present invention to provide a coupling capable of preventing the above.

[0006]

To achieve the above object, in the coupling of the present invention, a pulley is rotatably disposed on the outer peripheral side of a boss via a bearing and the boss and the pulley are made of rubber-like elastic material. In a coupling connected via an elastic body made of a material, a mass is connected to an inner peripheral side of the pulley via a second elastic body made of a rubber-like elastic material, and the mass is the boss side at the time of starting the engine. In addition to contacting the contact surface portion provided in the above, the contact surface portion is moved outward in the radial direction by centrifugal force in a rotation region of idle rotation or more and separated from the contact surface portion.

[0007]

In the coupling of the present invention having the above structure, when the engine is started, the mass is in contact with the contact surface portion provided on the boss side, which causes resistance due to contact friction. By connecting the boss and the pulley in parallel with the elastic body, a large damping is obtained and the vibration transmissibility due to resonance is reduced. Also, when the rotation area exceeds the idle rotation, the mass moves radially outward due to centrifugal force and separates from the contact surface portion,
Low damping.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A mass that moves in a radial direction depending on the magnitude of centrifugal force is not useful as a ring-shaped body because of its function. In addition, it is necessary to keep the rotational balance of the entire coupling normal with this mass attached. Therefore, for these reasons, it is preferable that the mass is a block body and a plurality of block bodies are equally arranged.

Further, in order to increase the resistance due to the above-mentioned contact friction, it is preferable that the contact surface of the mass contacting the contact surface portion is an arc surface matching the contact surface portion.

The material of the second elastic body may be the same as that of the elastic body, but in consideration of its local function, it is preferable to use a high damping rubber.

[0011]

Embodiments of the present invention will now be described with reference to the drawings.

First Embodiment As shown in FIGS. 1 and 2, a pulley 3 is rotatably arranged on the outer peripheral side of a boss 1 via a bearing 2.
The boss 1 and the pulley 3 are connected via an elastic body 4 made of a rubber-like elastic material. The boss 1 and the pulley 3 are each formed in a ring shape from a predetermined metal such as cast iron, and a poly V-shaped pulley groove 3a is provided in a part of the outer peripheral surface of the pulley 3. The bearing 2 is a ball bearing,
The inner race 5 is fitted on the outer peripheral side of the boss 1, and the outer race 6 is fitted on the inner peripheral side of the pulley 3. The elastic body 4 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and is vulcanized and bonded to the inner sleeve 7 and the outer sleeve 8 at the same time as the vulcanization and molding, and the inner sleeve 7 is attached to the outer peripheral side of the boss 1. The elastic body 4 connects the boss 1 and the pulley 3 by being fitted and the outer sleeve 8 being fitted on the inner peripheral side of the pulley 3. The inner sleeve 7 and the outer sleeve 8 are each formed in a ring shape from a predetermined metal such as sheet metal.

In the middle of the bearing 2 and the elastic body 4,
A mass 10 is connected to the inner peripheral side of the pulley 3 via a second elastic body 9 made of a rubber-like elastic material.
As shown in FIG. 2 and FIG. 2, when the engine is started, it comes into contact with the contact surface portion 1a provided on the boss 1 side, and as shown in FIG. To the contact surface 1a
Away from you. As shown in FIGS. 2 and 3, the second elastic body 9 is non-annularly vulcanized and molded by a predetermined rubber-like elastic material, and is simultaneously vulcanized and bonded to the pulley 3 and the mass 10. There is. The mass 10 is formed of a predetermined metal such as cast iron into a non-circular block body, and has a surface (also referred to as an inner surface or a contact surface) 10a on the boss 1 side.
Is formed into an arc surface having the same curvature as the contact surface portion 1a.
A plurality of second elastic bodies 9 and masses 10 are equally arranged. The contact surface portion 1a is formed by a part of the outer peripheral surface of the boss 1 which is exposed between the inner race 5 and the inner sleeve 7 of the bearing 2.

In the coupling having the above structure, the mass 10 has the inner surface 1 at the time of starting the engine.
0a is in contact with the contact surface portion 1a provided on the boss 1 side, resistance due to contact friction is generated, and the second elastic body 9 connects the boss 1 and the pulley 3 in parallel with the elastic body 4. As a result, as shown in FIG. 4, large damping is obtained and the vibration transmissibility due to resonance is reduced.
Further, in the rotation region of idle rotation or more, the mass 10 moves radially outward by the centrifugal force and separates from the contact surface portion 1a, so that the damping is low as shown in FIG. Therefore, the vibration transmissibility at the time of starting the engine can be made smaller than in the conventional case, whereby the elastic body 4
It is possible to prevent the component from being damaged and the auxiliary device from generating an abnormal noise.

Second Embodiment: As shown in FIGS. 5 and 6, a pulley 3 is rotatably arranged on the outer peripheral side of a boss 1 via a bearing 2.
The boss 1 and the pulley 3 are connected via an elastic body 4 made of a rubber-like elastic material. The boss 1 and the pulley 3 are each formed in a ring shape from a predetermined metal such as cast iron, and a poly V-shaped pulley groove 3a is provided in a part of the outer peripheral surface of the pulley 3. The bearing 2 is a ball bearing,
The inner race 5 is fitted on the outer peripheral side of the boss 1, and the outer race 6 is fitted on the inner peripheral side of the pulley 3. The elastic body 4 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and is vulcanized and bonded to the inner sleeve 7 and the outer sleeve 8 at the same time as the vulcanization and molding, and the inner sleeve 7 is attached to the outer peripheral side of the boss 1. The elastic body 4 connects the boss 1 and the pulley 3 by being fitted and the outer sleeve 8 being fitted on the inner peripheral side of the pulley 3. The inner sleeve 7 and the outer sleeve 8 are each formed in a ring shape from a predetermined metal such as sheet metal.

In the middle of the bearing 2 and the elastic body 4,
A mass 10 is connected to the inner peripheral side of the pulley 3 via a second elastic body 9 made of a rubber-like elastic material.
Further, as shown in FIG. 6, when the engine is started, the contact surface portion 1a provided on the boss 1 side comes into contact with the contact surface portion 1a via a buffer portion 11 to be described later, and as shown in FIG. In the above, due to the centrifugal force, it moves outward in the radial direction and separates from the contact surface portion 1a. As shown in FIGS. 6 and 7, the second elastic body 9 is non-annularly vulcanized and molded by a predetermined rubber-like elastic material, and simultaneously vulcanized and bonded to the pulley 3 and the mass 10 by vulcanization. There is. The mass 10 is formed of a predetermined metal such as cast iron into a non-annular block body, and a surface (also referred to as an inner surface) 10a on the boss 1 side is formed into an arc surface having the same curvature as the contact surface portion 1a. A film-shaped cushioning portion 11 integral with the two elastic bodies 9 is attached. On both sides (both sides in the circumferential direction) of the second elastic body 9, stopper portions 12 that prevent the mass 10 from largely swinging in the high-speed rotation region are integrally provided with the second elastic body 9. The second elastic body 9, the mass 10,
A plurality of buffer portions 11 and a pair of stopper portions 12 are equally arranged. The contact surface portion 1a is formed by a part of the outer peripheral surface of the boss 1 which is exposed between the inner race 5 and the inner sleeve 7 of the bearing 2.

In the coupling having the above structure, the mass 10 has the inner surface 1 at the time of starting the engine.
0a is in contact with the contact surface portion 1a provided on the boss 1 side via the buffer portion 11, and resistance due to contact friction is generated, and the second elastic body 9 is arranged in parallel with the elastic body 4 to connect to the boss 1. By connecting with the pulley 3, as shown in FIG. 4, large damping is obtained and the vibration transmissibility due to resonance is reduced. Further, in the rotation region of idle rotation or more, the mass 10 moves radially outward by the centrifugal force and separates from the contact surface portion 1a, so that the damping is low as shown in FIG. Therefore, the vibration transmissibility when starting the engine can be made smaller than before,
As a result, it is possible to prevent the elastic body 4 from being damaged or the auxiliary machine from generating abnormal noise. Further, since the cushioning portion 11 made of a rubber-like elastic material is provided on the inner surface 10a of the mass 10, it is different when the mass 10 contacts the contact surface portion 1a or when the mass 10 slides on the contact surface portion 1a. It is possible to prevent sound from being generated, and since the stopper portions 12 are provided on both sides of the second elastic body 9, it is possible to prevent the mass 10 from largely swinging in the high speed rotation region. .

Regarding the coupling in the above embodiment, the structure can be changed as follows. A plurality of second elastic bodies 9 are equally arranged on each pulley 3
Instead of vulcanizing and adhering to the inner peripheral surface of the
Such a sleeve (not shown) is prepared, the second elastic body 9 is vulcanized and adhered to the inner peripheral surface of the sleeve, and the sleeve is fitted to the inner peripheral side of the pulley 3. In FIG. 1 or 5, the inner sleeve 7 is extended to the left, and a contact surface portion 1a is formed on the outer peripheral surface of the inner sleeve 7. The buffer portion 11 is separated from the second elastic body 9 and is fixed only to the inner surface 10a of the mass 10. The buffer portion 11 is formed separately from the second elastic body 9, and the buffer portion 11 is made of resin.

[0019]

The present invention has the following effects.

That is, in the coupling of the present invention having the above structure, the mass is in contact with the contact surface portion at the time of starting the engine, and resistance is generated due to contact friction, and the second elastic body is made of an elastic body. By connecting the boss and the pulley in parallel with each other, a large damping is obtained and the vibration transmissibility due to resonance is reduced. Further, when the rotation region is equal to or more than the idle rotation, the mass moves radially outward due to the centrifugal force and separates from the contact surface portion, so that the damping is low. Therefore, the vibration transmissibility at the time of starting the engine can be made smaller than in the conventional case, whereby it is possible to prevent the elastic body from being damaged or the auxiliary machine from making an abnormal noise.

[Brief description of drawings]

FIG. 1 is a half cutaway view of a coupling according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a sectional view showing an operating state of the coupling.

FIG. 4 is a graph showing the relationship between engine speed and vibration transmissibility.

FIG. 5 is a half sectional view of a coupling according to a second embodiment of the present invention.

6 is an enlarged sectional view taken along line BB in FIG.

FIG. 7 is a sectional view showing an operating state of the coupling.

[Explanation of symbols]

 1 Boss 2 Bearing 3 Pulley 3a Pulley groove 4 Elastic body 5 Inner race 6 Outer race 7 Inner sleeve 8 Outer sleeve 9 Second elastic body 10 Mass 10a Inner surface 11 Buffer section 12 Stopper section

Claims (1)

[Claims] 1. A bearing (2) on the outer peripheral side of the boss (1)
In the coupling in which the pulley (3) is rotatably arranged via the boss (1) and the pulley (3) are connected via an elastic body (4) made of a rubber-like elastic material,
A mass (10) is connected to an inner peripheral side of the pulley (3) through a second elastic body (9) made of a rubber-like elastic material, and the mass (1) is connected.
0) contacts the contact surface portion (1a) provided on the side of the boss (1) at the time of starting the engine, and moves outward in the radial direction by centrifugal force in a rotation region of idling rotation or more to move the contact surface portion (1a). Coupling characterized in that it is separate from 1a).