JPH10267083A - Torque fluctuation absorbing damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce volume of radiation noises produced at the time of operation, by arranging a pulley displaceably connected to a hub and an elastic body which is connected to an outer sleeve and also stuck to the inner circumferential surface of a pulley groove part. SOLUTION: The peripheral surface 11a of an elastic body 11 stuck to the peripheral surface of the outer sleeve 5 of a coupling, is stuck to the inner circumferential surface 10e of the pulley groove part 10c of a pulley 10 therefore, the vibration energy of the pulley 10, which is a cause to produce radiation noises, can be absorbed by this elastic body 11. Therefore, volume of radiation noises produced at the time of operation can be reduced. Also, a projected groove part 11b is integrally formed in the elastic body 11 and the end surface 11c of this projected groove part 11a is stuck to the end surface 10f of the diametral direction part 10b of the pulley 10 therefore, vibration energy absorbing effect can be obtained to more extent. Also, a part of radiation noises is shut up in a sealed space 12 thereby, the volume of radiation noises can be also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a torque fluctuation absorbing damper. The torque fluctuation absorbing damper of the present invention, for example, absorbs torque fluctuation generated on the crankshaft side when transmitting torque from the engine crankshaft to various auxiliary machines via the torque fluctuation absorbing damper and the endless belt. Thus, the endless belt or the auxiliary machine is smoothly rotated without transmitting to the endless belt side.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a torque fluctuation absorbing damper in which a pulley 53 is connected to a hub 51 via a coupling 52 and a bearing 54 is interposed between the hub 51 and the pulley 53 is provided. Known (6
3-68540).

In the torque fluctuation absorbing damper shown in FIG. 4, the pulley 53 is made of cast iron. However, in order to reduce the weight of the parts, if this is made of sheet metal, for example, as shown in FIG. The inner peripheral surface 53b of the groove 53a is
It will have a substantially arc-shaped cross section facing inward in the radial direction.
Therefore, since the outer sleeve 52a of the coupling 52 having a substantially cylindrical shape is fitted to the inner peripheral side of the pulley groove 53a having the inner peripheral surface 53b having a substantially arc-shaped cross section, the fitting area is extremely large. It may be so small that a sufficient fitting load cannot be obtained. If the fitting load is not sufficiently obtained, the outer sleeve 52a and the pulley groove 53a may slide in the rotating direction during operation, and thus the torque fluctuation absorbing function may be impaired.

[0004] Outer sleeve 52a and pulley groove 53
5, the inner peripheral surface 53b of the pulley groove 53a is formed into a cylindrical shape that is not substantially arc-shaped but is straight in the axial direction.
A method of increasing the fitting area with the endless belt 2a can be considered. However, when it is necessary to maintain the shape of the bottom of the inner surface of the pulley groove 53a in a substantially arcuate cross-section in relation to the endless belt, the pulley groove 53a is required. The inner peripheral surface 53b must be formed into a substantially arc-shaped cross section, and then only the inner peripheral surface 53b must be cut into a cylindrical shape by post-processing. Therefore, in this case, post-processing of cutting the inner peripheral surface 53b of the pulley groove portion 53a into a cylindrical shape is necessary, and extra work is required. There is a concern that the rigidity of 53a will decrease.

[0005] Further, since both the outer sleeve 52a and the pulley groove 53a are made of metal, even if a dimensional error in their diameters occurs in the molding, they cannot be absorbed by fitting them in many cases. Therefore, if the fitting allowance is too large, one of them is plastically deformed, and if it is too small, the above-mentioned sliding is further promoted.

Further, since the pulley 53 acts like a speaker that diffuses the operation sound generated during the rotation operation, there is a disadvantage that a large radiated sound is generated during the operation. In order to reduce the volume of the radiated sound of the pulley 53, a method of perforating a large number of small holes in the pulley 53 can be considered. However, this method involves reducing the rigidity of the pulley 53 by perforating the small holes. Depending on the use condition of the damper or the specification of the pulley 53, it may be difficult to cope with the problem.

[0007]

SUMMARY OF THE INVENTION In view of the above, the present invention does not allow the outer sleeve of the coupling and the pulley groove of the pulley, which are connected to each other, to slide in the rotational direction during operation. The fluctuation absorbing function is not impaired, and even if there is a dimensional error in the diameter of the outer sleeve or the pulley groove in the molding, it can be absorbed, so that the part can be plastically deformed or slid. It is an object of the present invention to provide a torque fluctuation absorbing damper capable of reducing the volume of radiated sound generated during operation without performing a small hole in the pulley without performing the operation.

[0008]

In order to achieve the above object, a torque fluctuation absorbing damper according to the present invention comprises a coupling rubber having a coupling connected to a hub and an outer sleeve connected to the coupling rubber. A pulley groove portion disposed on the outer peripheral side of the outer sleeve and connected to the hub via a bearing so as to be displaceable, and a pulley connected to the outer sleeve and bonded to an inner peripheral surface of the pulley groove portion. And an elastic body made of a rubber-like elastic material.

When an elastic body made of a rubber-like elastic material is interposed between the outer sleeve of the coupling and the pulley groove of the pulley as in the torque fluctuation absorbing damper of the present invention having the above configuration, While the outer sleeve and the pulley groove are connected by the elastic body, they can be prevented from sliding, and if there is a radial dimensional error in the outer sleeve or the pulley groove, it is compensated for. The dimensional error can be absorbed by the elastic body being elastically deformed in the radial direction. In addition, while the radiation sound is generated by the vibration of the pulley, the elastic body adhered to the pulley absorbs the vibration energy of the pulley.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a torque fluctuation absorbing damper according to this embodiment first includes a hub 1 which is a mounting part for a shaft (not shown). A coupling 2 which is a molded product assembly is fitted.

The hub 1 is formed in a ring shape from a metal such as cast iron or a rigid material, and has a boss 1a for attaching a shaft.
And a cylindrical portion 1b and a flange-shaped rising portion 1c.

The coupling 2 is an inner sleeve 3 made of a metal or a rigid material such as a sheet metal fitted on the outer peripheral side of the cylindrical portion 1 b of the hub 1, and is vulcanized and bonded to the outer peripheral side of the inner sleeve 3. A coupling rubber 4 made of a rubber-like elastic material having an annular shape, and an outer sleeve made of a metal or rigid material such as a sheet metal to which the coupling rubber 4 is arranged and vulcanized and bonded on the outer peripheral side of the coupling rubber 4. The three parts 3, 4, 5 are manufactured in advance as an integral vulcanized molded product, and are fitted together on the outer peripheral side of the cylindrical portion 1b of the hub 1. Each of the inner sleeve 3 and the outer sleeve 5 is cylindrical.

The rising portion 1 of the coupling 2 and the hub 1
c, a bearing 6 is fitted on the outer peripheral side of the cylindrical portion 1b of the hub 1, and a pulley 10 is fitted on the outer peripheral side of the bearing 6.

The bearing 6 is a ball bearing and includes an inner race 7 fitted on the outer peripheral side of the cylindrical portion 1b of the hub 1, a ball 8 as a rolling element, and an outer race 9. A pulley 10 is fitted on the outer peripheral side of the outer race 9.

The pulley 10 is formed in an annular shape from a metal or a rigid material such as a sheet metal, and has a cylindrical portion 10a fitted on the outer peripheral side of the outer race 9, a flange-shaped radial portion 10b, a mono-V-shaped portion. And the pulley groove 10c is integrally provided, and the pulley groove 10c is arranged on the outer peripheral side of the outer sleeve 5 of the coupling 2. At the end of the cylindrical portion 10a, a protruding engagement portion 10d is integrally provided so as to protrude in the axial direction.
Are engaged with a hole-shaped engaging portion 1d provided in the rising portion 1c. The pair of engagement portions 1d and 10d limit the relative rotation of the pulley 10 with respect to the hub 1 to a predetermined angle by the engagement, thereby preventing excessive twisting or load from acting on the coupling 2 (rotation angle). Limiting stopper).

An annular elastic body 11 made of a rubber-like elastic material is vulcanized and bonded to the outer peripheral side of the outer sleeve 5 of the coupling 2, and the elastic body 11 has an outer peripheral surface 11a.
And vulcanized and bonded to the inner peripheral surface 10e of the pulley groove 10c of the pulley 10 over the entire circumference. This elastic body 1
1, an annular ridge 11b is provided on the radial portion 10 of the pulley 10.
The protrusion 11b is integrally formed and vulcanized and bonded to the end face 10f of the radial section 10b at the end face 11c over the entire circumference. The elastic body 11 is formed of the same type of rubber material with respect to the coupling rubber 4, but may be formed of a different type of rubber material.
Radial portion 10b, pulley groove 10c and ridge 11b
Form an annular closed space 12 surrounded by these.

A torsional damper 13 for absorbing torsional vibration generated in a shaft (not shown) is fitted on the outer peripheral side of the rising portion 1c of the hub 1. The torsion damper 13 is a sleeve 14 made of a metal or a rigid material such as a sheet metal fitted on the outer peripheral side of the rising portion 1 c of the hub 1.
And a rubber-like elastic damper rubber (also referred to as an elastic body) 15 which is vulcanized and bonded to the outer peripheral side of the sleeve 14. The damper rubber 15 is disposed on the outer peripheral side of the damper rubber 15 and vulcanized. A mass body (also referred to as a vibrating ring) made of a metal or a rigid material such as a bonded cast iron 1
The three parts 14, 15, 16 are manufactured in advance as an integral vulcanized molded product, and are fitted together on the outer peripheral side of the rising portion 1c of the hub 1. Sleeve 1
4 is cylindrical, and the mass body 16 is annular.

In manufacturing the torque fluctuation absorbing damper having the above-described configuration, each component and the torsional damper 13 are manufactured, and a three-layer coupling including the inner sleeve 3, the coupling rubber 4 and the outer sleeve 5 is manufactured. After manufacturing the elastic member 2, the elastic body 11 is bonded (baked) to the outer peripheral surface of the outer sleeve 5 of the coupling 2. In place of this, each component and the torsional damper 13 are manufactured, and at the same time when the coupling 2 including the inner sleeve 3, the coupling rubber 4 and the outer sleeve 5 is manufactured, the outer sleeve 5 of the coupling 2 is simultaneously manufactured. Elastic body 1 on outer surface
1 is bonded (baked). Next, the bearing 6 and the pulley 10 are fitted to the hub 1, and before and after this fitting,
An adhesive (not shown) is applied to the end surface 10f of the radial portion 10b of the pulley 10 and the inner peripheral surface 10e of the pulley groove 10c (if the adhesive is applied in a series), then the elastic body 11
The coupling 2 is connected to the hub 1 and the elastic body 1
The end surface 11c of the ridge portion 11b is brought into contact with the end surface 10f of the radial portion 10b for axial positioning, and the outer peripheral surface 11a of the elastic body 11 is fixed to the inner peripheral surface 1 of the pulley groove portion 10c.
0e, and then heated to cause the adhesive and the elastic body 11 to react with each other, so that the end face 11c of the ridge 11b of the elastic body 11
To the end surface 10f of the radial portion 10b and the outer peripheral surface 11a of the elastic body 11 to the inner peripheral surface 10 of the pulley groove 10c.
Adhere to e.

Pulley groove 10c formed by pressing a sheet metal
The inner peripheral surface 10e has a substantially arc-shaped cross section facing inward in the radial direction.
As shown in FIG. 2, the inner peripheral surface 1 having a substantially arc-shaped cross section
0e is formed in a substantially arc-shaped cross section. The outer diameter of the elastic body 11 is formed slightly larger than the inner diameter of the pulley groove 10c. By doing so, the elastic body 11
Is compressed in the radial direction to generate a reaction force, and the reaction force causes the elastic body 11 to be bonded to the pulley groove 10c in a state where the elastic body 11 is pressed with a large area, so that the bonding can be strengthened. It is.

The torque fluctuation absorbing damper according to this embodiment has the following functions and effects due to the provision of the above configuration.

That is, first, the elastic body 11 bonded to the outer peripheral surface of the outer sleeve 5 of the coupling 2 is bonded to the inner peripheral surface 10e of the pulley groove 10c of the pulley 10 at its outer peripheral surface 11a. Since the sleeve 5 and the pulley groove 10c are connected via the elastic body 11, the outer sleeve 5 and the pulley groove 10c may be displaced in the rotational direction within the elastic deformation limit of the elastic body 11. , Is not displaced at an angle larger than that, and is securely connected. Therefore, the outer sleeve 5 and the pulley groove 1
It is possible to transmit the torque reliably without sliding with 0c, thereby preventing the torque fluctuation absorbing function from being impaired. Further, while the inner peripheral surface 10e of the pulley groove portion 10c formed by pressing the sheet metal has a substantially arc-shaped cross section facing inward in the radial direction, this operational effect can be obtained without changing this shape. This effect can be obtained without changing the shape of the three-layered coupling 2 composed of the inner sleeve 3, the coupling rubber 4 and the outer sleeve 5. It does not require much labor and the existing manufacturing equipment can be used as it is.

Further, since the ridge 11b is integrally formed with the elastic body 11, and the ridge 11b is bonded to the end face 10f of the radial section 10b of the pulley 10 at its end face 11c, the elastic body 11 The connection between the outer sleeve 5 and the pulley 10 is further strengthened.

Second, the elastic body 11 bonded to the outer peripheral surface of the outer sleeve 5 of the coupling 2
a, the outer sleeve 5 and the pulley groove 10c are adhered to the inner peripheral surface 10e of the pulley groove 10c of the pulley 10.
Are connected via the elastic body 11, even if the outer sleeve 5 or the pulley groove 10c has a dimensional error in the radial direction, the elastic body 11 is used to make up for this.
The dimensional error can be absorbed by elastically deforming in the radial direction. Therefore, it is possible to prevent the parts from being plastically deformed or slid as in the related art, and it is allowed to manufacture these parts without increasing the dimensional accuracy.

Third, the elastic body 11 bonded to the outer peripheral surface of the outer sleeve 5 of the coupling 2
a, which is adhered to the inner peripheral surface 10e of the pulley groove 10c of the pulley 10 at a.
The vibration energy of 0 is absorbed by the elastic body 11. Therefore, the volume of the radiated sound generated during operation can be reduced. Further, since many small holes are not formed in the pulley 10, the rigidity of the pulley 10 does not decrease.

Also, since the ridge 11b is integrally formed with the elastic body 11, and the ridge 11b is adhered to the end face 10f of the radial portion 10b of the pulley 10 at its end face 11c, vibration energy is absorbed. The effect is even greater. Further, since a part of the radiated sound is confined in the closed space 12, the volume of the radiated sound can be reduced.

Fourth, when the coupling 2 is fitted to the hub 1, the ridge 11b integrally formed with the elastic body 11 is connected to the end face 10c of the radial portion 10b of the pulley 10 by its end face 11c.
Since the shaft 2 is brought into contact with the shaft f from one side in the axial direction, the coupling 2 can be accurately positioned in the axial direction with respect to the hub 1.

The effect of this positioning is as follows.
As shown in FIG. 3, the height is further increased by adding a stopper member 17 made of a rigid material.

That is, the stopper member 17 is formed in an annular shape from a metal or a rigid material such as a sheet metal, is fitted on the outer peripheral side of the outer sleeve 5, and the elastic body 11 is vulcanized and bonded to the outer peripheral surface thereof. ing. The stopper member 17 extends axially longer than the outer sleeve 5 toward the radial portion 10b of the pulley 10, and has an end portion 17a which is bent in an arc shape inward in the radial direction. When the portion 17a abuts against the end face 10f of the radial portion 10b from one side in the axial direction, the coupling 2 is accurately positioned in the axial direction with respect to the hub 1. In order to prevent the metal contact between the stopper member 17 and the radial portion 10b, it is necessary to form the ridge 1 on the end face of the end 17a.
A film-like buffer portion 11d integral with 1b is bonded so that the buffer portion 11d is sandwiched between the end portion 17a and the radial portion 10b. The other configuration of the torque fluctuation absorbing damper in FIG. 3 is the same as the torque fluctuation absorbing damper according to the above-described first embodiment.

[0030]

The present invention has the following effects.

That is, in the torque fluctuation absorbing damper of the present invention having the above-described structure, first, an elastic body made of a rubber-like elastic material connected to the outer sleeve of the coupling is provided on the inner peripheral surface of the pulley groove of the pulley. Since the outer sleeve and the pulley groove are connected via this elastic body, the outer sleeve and the pulley groove may be displaced in the rotational direction within the elastic deformation limit of the elastic body. Are not displaced at an angle larger than that, and are securely connected. Therefore, the outer sleeve and the pulley groove do not slide, and the torque can be transmitted reliably, thereby preventing the torque fluctuation absorbing function from being impaired. Further, even when the inner peripheral surface of the pulley groove portion formed by pressing the sheet metal has a substantially arc-shaped cross-section, this effect can be obtained without changing the shape, and the coupling rubber can be obtained. This effect can be obtained without changing the shape of the coupling having the outer sleeve and the outer sleeve, so that they can be manufactured without extra work and the existing manufacturing equipment can be used as it is. it can.

Second, an elastic body made of a rubber-like elastic material connected to the outer sleeve of the coupling is adhered to the inner peripheral surface of the pulley groove of the pulley, and the outer sleeve and the pulley groove form this elastic body. Even if there is a dimensional error in the radial direction in the outer sleeve or the pulley groove portion, the elastic body is elastically deformed in the radial direction to compensate for the dimensional error, so that the dimensional error can be absorbed. Therefore, it is possible to prevent the parts from being plastically deformed or slid as in the related art, and it is allowed to manufacture these parts without increasing the dimensional accuracy.

Third, since the elastic body made of rubber-like elastic material connected to the outer sleeve of the coupling is adhered to the inner peripheral surface of the pulley groove of the pulley, the pulley of the pulley, which is a cause of the generation of radiated sound, is formed. Vibration energy is absorbed by this elastic body. Therefore, the volume of the radiated sound generated during operation can be reduced. In addition, since many small holes are not formed in the pulley, the rigidity of the pulley does not decrease.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a torque fluctuation absorbing damper according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a single-piece state of a coupling.

FIG. 3 is a half sectional view of a torque fluctuation absorbing damper according to another embodiment of the present invention.

FIG. 4 is a half sectional view of a torque fluctuation absorbing damper according to a conventional example.

FIG. 5 is an explanatory view when a pulley is made of sheet metal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub 1a Boss part 1b Cylindrical part 1c Rising part 1d, 10d Engaging part 2 Coupling 3 Inner sleeve 4 Coupling rubber 5 Outer sleeve 6 Bearing 7 Inner race 8 Ball 9 Outer race 10 Pulley 10a Cylindrical part 10b Radial part 10c Pulley groove portion 10e Inner peripheral surface 10f, 11c End surface 11 Elastic body 11a Outer peripheral surface 11b Projection 11d Buffer 12 Space 13 Torsion damper 14 Sleeve 15 Damper rubber 16 Mass 17 Stopper member 17a End

Claims (1)

[Claims] A coupling (2) comprising a coupling rubber (4) connected to a hub (1) and an outer sleeve (5) connected to the coupling rubber (4).
A pulley (10) having a pulley groove (10c) arranged on the outer peripheral side of the outer sleeve (5) and being movably connected to the hub (1) via a bearing (6); An elastic body (11) made of a rubber-like elastic material connected to the sleeve (5) and bonded to an inner peripheral surface (10e) of the pulley groove (10c).