JPH09287649A - Torque fluctuation absorbing damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resiliently press a thrust bearing against a pulley without a thrust spring for an exclusive use and to reduce the number of parts of a damper, in a torque fluctuation absorbing damper comprising a coupling part having a hub and a pulley interconnected through a bearing and an elastic body and a torsional damper part having the hub and a mass body interconnected through the elastic body. SOLUTION: A thrust bearing 12 having an axial length L longer than a distance (c) between two members 3 and 10 is located between a pulley 3 and a mass body 10 and the mass body 10 is axially displaced and an elastic body 9 connected thereto is elastically deformed, and through an axial elastic restoration force due to the displacement and elastic deformation, a thrust bearing 12 is pressed against the pulley 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque fluctuation absorbing damper having a coupling portion and a torsional damper portion.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
And a coupling portion 55 in which the pulley 52 is connected via a bearing 53 and an elastic body 54 made of a rubber-like elastic material.
There is known a torque fluctuation absorbing damper including a torsional damper portion 58 in which a hub 51 and a mass body 56 are connected via an elastic body 57 made of a rubber-like elastic material. In this type of damper, a hub 51 In order to prevent axial rattling in the rotatable coupling structure consisting of the bearing 53 and the pulley 52, conventionally, a plate-shaped thrust spring 59 is incorporated and the thrust bearing 60 is pressed against the pulley 52 by its elasticity. Was there. Therefore, according to this conventional technique, a dedicated thrust spring 59 must be prepared in order to obtain the pressing force in the axial direction, which causes a problem that the number of parts of the damper increases and the cost is disadvantageous. .

[0003]

In view of the above points, the present invention provides a torque fluctuation absorbing damper having a coupling portion and a torsional damper portion, in which a thrust bearing is elastically attached to a pulley without a dedicated thrust spring. It is an object of the present invention to provide a torque fluctuation absorbing damper that can be pressed and can reduce the number of parts of the damper.

[0004]

In order to achieve the above object, a torque fluctuation absorbing damper according to the present invention comprises a coupling portion in which a hub and a pulley are connected via a bearing and an elastic body made of a rubber-like elastic material, and In a torque fluctuation absorbing damper comprising a hub and a mass body connected via an elastic body made of a rubber-like elastic material, a torque fluctuation absorbing damper, and an axial direction larger than a gap between the pulley and the mass body. The mass body is axially displaced through a thrust bearing having a length, and the elastic body connected thereto is elastically deformed, and the thrust is generated by the displacement and the elastic restoring force in the axial direction due to the elastic deformation. We decided to press the bearing against the pulley.

[0005]

The torque fluctuation absorbing damper of the present invention having the above-mentioned construction is one in which the thrust bearing is pressed against the pulley by the elastic restoring force in the axial direction of the elastic body of the torsional damper portion. Since it is a component originally provided in the damper, it is possible to reduce the number of components of the damper as compared with the conventional example having the thrust spring described above.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Unlike the thrust bearing in the above-mentioned conventional example, the thrust bearing interposed between the pulley and the mass body displaces the mass body in the axial direction and elastically deforms the elastic body connected thereto. In order to be able to do so, it has an axial length greater than the distance between the pulley and the mass body. The distance between the pulley and the mass body to be compared is the distance between the pulley and the mass body at the location where the thrust bearing is interposed.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings.

First Embodiment As shown in FIG. 1, a pulley 3 is rotatably connected to an outer peripheral side of a hub 1 via a ball type bearing 2 and a rubber is provided between the hub 1 and the pulley 3. An elastic body (also referred to as coupling rubber) 4 made of elastic material is interposed, and a coupling portion 5 for absorbing torque fluctuations in a low rotation range is provided by these. The hub 1 and the pulley 3 are each formed in a ring shape by a predetermined rigid material such as metal,
The pulley 3 is provided between the boss portion 3a fitted on the outer peripheral side of the bearing 2 and the rim portion 3b provided with the belt engaging groove 3c.
A stay portion 3d thinner than these is integrally provided. The elastic body 4 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and simultaneously vulcanized and vulcanized and bonded to the inner sleeve 6 and the outer sleeve 7, and the inner sleeve 6 is fitted to the outer peripheral side of the hub 1. By fitting the outer sleeve 7 on the inner peripheral side of the rim portion 3b of the pulley 3,
It is interposed between the hub 1 and the pulley 3.

A mass body (also referred to as a vibrating ring) 10 is connected to the outer peripheral side of the hub 1 along the axial direction of the coupling portion 5 via a sleeve 8 and an elastic body 9 made of a rubber-like elastic material. With these, the torsional damper portion 11 for reducing the torsional vibration of the crankshaft in the middle-high rotation range
Is provided. The mass body 10 is formed into an annular shape by a predetermined rigid material such as metal, and the belt engaging groove 10a is formed on the outer peripheral surface thereof.
It has. The elastic body 9 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and simultaneously vulcanized and vulcanized and bonded to the sleeve 8 and the mass body 10, and the sleeve 8 is fitted to the outer peripheral side of the hub 1, It is interposed between the hub 1 and the mass body 10.

The boss portion 3a and the stay portion 3d of the pulley 3
A thrust bearing 12 made of synthetic resin and having an annular shape with an axial length L larger than the distance c between the members 3 and 10 is interposed between the mass body 10 and the mass body 10, and the mass body is 10 is displaced in the axial direction and the elastic body 9 connected thereto is elastically deformed, and the thrust bearing 12 is moved to the pulley 3 by the displacement of the mass body 10 and the elastic return force in the axial direction due to the elastic deformation of the elastic body 9. It is pressed so that the pulley 3 is pressed against the bearing 2 so that the rotatable connection structure composed of the hub 1, the bearing 2 and the pulley 3 does not cause rattling in the axial direction.

That is, between the boss portion 3a and stay portion 3d of the pulley 3 and the mass body 10, a substantially L-shaped cross section is formed.
A thrust bearing 12 made of a V-shaped synthetic resin is interposed, and the thrust bearing 12 is interposed so that the mass body 10 moves from the position of the chain line before the thrust bearing 12 is inserted to the position of the solid line after the insertion. The elastic body 9 is elastically deformed while being axially displaced to
The thrust bearing 12 is pressed against the pulley 3 by the elastic force (reaction force) of the elastic body 9 accompanying this, and the pulley 3 is pressed against the bearing 2 so that the hub 1, the bearing 2 and the pulley 3 are rotatable together. It is designed so that there is no backlash in the axial direction.

The torque fluctuation absorbing damper having the above structure is mounted on, for example, a crankshaft of an automobile engine, and the coupling section 5 absorbs torque fluctuation in a low rotation range and the torsional damper section 11 absorbs a crank in a middle and high rotation range. It is intended to reduce the torsional vibration of the shaft, and is characterized in that the above-mentioned configuration provides the following operational effects.

That is, in the torque fluctuation absorbing damper having the above construction, the thrust bearing 12 is generated by the elastic restoring force of the elastic body 9 of the torsional damper portion 11 in the axial direction.
Is pressed against the pulley 3, and since the elastic body 9 of the torsional damper portion 11 is a component originally provided in the damper, the number of components of the damper is larger than that of the conventional example including the thrust spring. Can be reduced. Therefore, a damper product having a simple structure, easy assembly, and cost advantage can be provided.

Second Embodiment As shown in FIG. 2, a pulley 3 is rotatably connected to an outer peripheral side of a hub 1 via a ball type bearing 2 and a rubber is provided between the hub 1 and the pulley 3. An elastic body (also referred to as coupling rubber) 4 made of elastic material is interposed, and a coupling portion 5 for absorbing torque fluctuations in a low rotation range is provided by these. The hub 1 and the pulley 3 are each formed in a ring shape by a predetermined rigid material such as metal,
The pulley 3 is provided between the boss portion 3a fitted on the outer peripheral side of the bearing 2 and the rim portion 3b provided with the belt engaging groove 3c.
A stay portion 3d thinner than these is integrally provided. The elastic body 4 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and simultaneously vulcanized and vulcanized and bonded to the inner sleeve 6 and the outer sleeve 7, and the inner sleeve 6 is fitted to the outer peripheral side of the hub 1. By fitting the outer sleeve 7 on the inner peripheral side of the rim portion 3b of the pulley 3,
It is interposed between the hub 1 and the pulley 3.

A mass body (also referred to as a vibrating ring) 10 is connected to the outer peripheral side of the hub 1 along the axial direction of the coupling portion 5 via a sleeve 8 and an elastic body 9 made of a rubber-like elastic material. With these, the torsional damper portion 11 for reducing the torsional vibration of the crankshaft in the middle-high rotation range
Is provided. The mass body 10 is formed into an annular shape by a predetermined rigid material such as metal, and the belt engaging groove 10a is formed on the outer peripheral surface thereof.
It has. The elastic body 9 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and simultaneously vulcanized and vulcanized and bonded to the sleeve 8 and the mass body 10, and the sleeve 8 is fitted to the outer peripheral side of the hub 1, It is interposed between the hub 1 and the mass body 10.

Between the stay portion 3d of the pulley 3 and the mass body 10, a length L in the axial direction which is larger than the distance c between the members 3 and 10 is provided.
A thrust bearing 12 made of synthetic resin and having a substantially rectangular cross section having an annular shape is interposed to displace the mass body 10 in the axial direction and elastically deform the elastic body 9 connected thereto. The thrust bearing 12 is pressed against the pulley 3 and the pulley 3 is pressed against the bearing 2 due to the elastic return force in the axial direction due to the displacement of the body 10 and the elastic deformation of the elastic body 9, and the hub 1, the bearing 2 and the pulley 3 are rotatable. It is designed so that there is no looseness in the axial direction in such a connecting structure.

That is, between the stay portion 3d of the pulley 3 and the mass body 10, a thrust bearing 12 made of synthetic resin having an annular shape and having a substantially rectangular cross section is interposed, and the thrust bearing 12 is interposed. Mass body 1
0 is axially displaced from the position of the chain line before the insertion of the thrust bearing 12 to the position of the solid line after the insertion, and the elastic body 9 is elastically deformed.
The thrust bearing 12 is pressed against the pulley 3 and the pulley 3 is pressed against the bearing 2 due to the elastic force (reaction force) of the hub 3, so that the rotatable connection structure including the hub 1, the bearing 2 and the pulley 3 is rattled in the axial direction. Will not occur.

The stay portion 3 of the pulley 3 of the coupling portion 5
As shown in FIG. 3, the engaging recess 13 is provided as an arcuate or fan-shaped through hole as shown in FIG. 3 in the axial direction. The engaging recess 13 protrudes in the axial direction from the mass body 10 of the torsional damper portion 11. The engagement protrusion 14 inserted into the engagement recess 13 is provided as an arc-shaped or fan-shaped protrusion when viewed from the axial direction, and has a predetermined size between the inner wall 13 a of the engagement recess 13 and the engagement protrusion 14. A gap 15 in the direction of rotation of the length θ is set, and a stopper 16 in the direction of rotation for preventing excessive deformation of the elastic body 4 of the coupling portion 5 is provided by these, so that the elastic body 4 is not damaged and the elastic body 9 is not damaged. By the buffering effect of the stopper 16
Does not generate a large hammering sound, the stopper portion 16 is not damaged, and the engaging protrusion 14 is provided on the mass body 10, so that the inertial mass of the mass body 10 can be increased. ing.

The torque fluctuation absorbing damper having the above structure is mounted on, for example, a crankshaft of an automobile engine, and the coupling section 5 absorbs torque fluctuations in a low rotation range and the torsional damper section 11 allows a crank in a middle and high rotation range. It is intended to reduce the torsional vibration of the shaft, and is characterized in that the above-mentioned configuration provides the following operational effects.

That is, in the torque fluctuation absorbing damper having the above structure, the thrust bearing 12 is generated by the elastic restoring force of the elastic body 9 of the torsional damper portion 11 in the axial direction.
Is pressed against the pulley 3, and since the elastic body 9 of the torsional damper portion 11 is a component originally provided in the damper, the number of components of the damper is larger than that of the conventional example including the thrust spring. Can be reduced. Therefore, a damper product having a simple structure, easy assembly, and cost advantage can be provided.

Third Embodiment As shown in FIG. 4, a pulley 3 is rotatably connected to an outer peripheral side of a hub 1 via a ball type bearing 2 and a rubber is provided between the hub 1 and the pulley 3. An elastic body (also referred to as coupling rubber) 4 made of elastic material is interposed, and a coupling portion 5 for absorbing torque fluctuations in a low rotation range is provided by these. The hub 1 and the pulley 3 are each formed in a ring shape by a predetermined rigid material such as metal,
The pulley 3 is provided between the boss portion 3a fitted on the outer peripheral side of the bearing 2 and the rim portion 3b provided with the belt engaging groove 3c.
A stay portion 3d thinner than these is integrally provided. The elastic body 4 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and simultaneously vulcanized and vulcanized and bonded to the inner sleeve 6 and the outer sleeve 7, and the inner sleeve 6 is fitted to the outer peripheral side of the hub 1. By fitting the outer sleeve 7 on the inner peripheral side of the rim portion 3b of the pulley 3,
It is interposed between the hub 1 and the pulley 3.

A mass body (also referred to as a vibrating ring) 10 is connected to the outer peripheral side of the hub 1 via a sleeve 8 and an elastic body 9 made of a rubber-like elastic material so as to be axially aligned with the coupling portion 5. With these, the torsional damper portion 11 for reducing the torsional vibration of the crankshaft in the middle-high rotation range
Is provided. The mass body 10 is formed into an annular shape by a predetermined rigid material such as metal, and the belt engaging groove 10a is formed on the outer peripheral surface thereof.
It has. The elastic body 9 is vulcanized and molded into an annular shape by a predetermined rubber-like elastic material, and simultaneously vulcanized and vulcanized and bonded to the sleeve 8 and the mass body 10, and the sleeve 8 is fitted to the outer peripheral side of the hub 1, It is interposed between the hub 1 and the mass body 10.

Between the stay portion 3d of the pulley 3 and the mass body 10, a length L in the axial direction larger than the distance c between the members 3 and 10 is provided.
A thrust bearing 12 made of synthetic resin and having a substantially rectangular cross section having an annular shape is interposed to displace the mass body 10 in the axial direction and elastically deform the elastic body 9 connected thereto. The thrust bearing 12 is pressed against the pulley 3 and the pulley 3 is pressed against the bearing 2 due to the elastic return force in the axial direction due to the displacement of the body 10 and the elastic deformation of the elastic body 9, and the hub 1, the bearing 2 and the pulley 3 are rotatable. It is designed so that there is no looseness in the axial direction in such a connecting structure.

That is, between the stay portion 3d of the pulley 3 and the mass body 10, a thrust bearing 12 made of synthetic resin having an annular shape and having a substantially rectangular cross section is interposed, and the thrust bearing 12 is interposed. Mass body 1
0 is axially displaced from the position of the chain line before the insertion of the thrust bearing 12 to the position of the solid line after the insertion, and the elastic body 9 is elastically deformed.
The thrust bearing 12 is pressed against the pulley 3 and the pulley 3 is pressed against the bearing 2 due to the elastic force (reaction force) of the hub 3, so that the rotatable connection structure including the hub 1, the bearing 2 and the pulley 3 is rattled in the axial direction. Will not occur.

The stay portion 3 of the pulley 3 of the coupling portion 5
As shown in FIG. 5, the engaging recess 13 is provided as an arcuate or fan-shaped through hole in the axial direction in FIG. 5D, and the engaging recess 13 protrudes in the axial direction from the mass body 10 of the torsional damper portion 11. The engaging protrusions 14 inserted into the engaging recesses 13 are provided as arc-shaped or fan-shaped protrusions when viewed from the axial direction, and the surfaces of the engaging protrusions 14 excluding the tip end surface are made of synthetic resin. A gap 15 in the direction of rotation of a predetermined size θ is set between the engaging convex portion 14 including the cushioning body 17 and the inner wall 13a of the engaging concave portion 13, and the elastic body of the coupling portion 5 is thereby formed. 4 is provided with a stopper portion 16 in the rotation direction for preventing excessive deformation, so that the elastic body 4 is not damaged and the elastic body 9 is not damaged.
Due to the buffering effect of, a large hammering sound is not generated when the stopper portion 16 operates, and the stopper portion 16 is not damaged.
Further, since the engaging protrusion 14 is provided on the mass body 10, the inertial mass of the mass body 10 can be increased. The shock absorber 17 is the thrust bearing 12
And a hole 1 for inserting the engaging projection 14 into the thrust bearing 12 and the shock absorber 17.
8 are provided.

The torque fluctuation absorbing damper having the above structure is mounted on, for example, a crankshaft of an automobile engine, the coupling section 5 absorbs torque fluctuations in a low rotation range, and the torsional damper section 11 causes a crank in a middle and high rotation range. It is intended to reduce the torsional vibration of the shaft, and is characterized in that the above-mentioned configuration provides the following operational effects.

That is, in the torque fluctuation absorbing damper having the above construction, the thrust bearing 12 is generated by the elastic restoring force of the elastic body 9 of the torsional damper portion 11 in the axial direction.
Is pressed against the pulley 3, and since the elastic body 9 of the torsional damper portion 11 is a component originally provided in the damper, the number of components of the damper is larger than that of the conventional example including the thrust spring. Can be reduced. Therefore, a damper product having a simple structure, easy assembly, and cost advantage can be provided.

[0028]

The present invention has the following effects.

That is, in the torque fluctuation absorbing damper of the present invention having the above-mentioned structure, the thrust bearing is pressed against the pulley by the axial elastic restoring force of the elastic body of the torsional damper portion. Since the elastic body of the damper part is a component originally provided in the damper, the number of components of the damper can be reduced as compared with the conventional example having the thrust spring. Therefore, a damper product having a simple structure, easy assembly, and cost advantage can be provided.

[Brief description of drawings]

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

FIG. 2 is a half cutaway view of a torque fluctuation absorbing damper according to a second embodiment of the present invention.

3 is a sectional view taken along line AA in FIG.

FIG. 4 is a half cutaway view of a torque fluctuation absorbing damper according to a third embodiment of the present invention.

5 is a sectional view taken along line BB in FIG.

FIG. 6 is a half sectional view of a torque fluctuation absorbing damper according to a conventional example.

[Explanation of symbols]

 1 hub 2 bearing 3 pulley 3a boss portion 3b rim portion 3c, 10a belt engaging groove 3d stay portion 4, 9 elastic body 5 coupling portion 6 inner sleeve 7 outer sleeve 8 sleeve 10 mass body 11 torsional damper portion 12 thrust bearing 13 Engagement Recess 13a Inner Wall 14 Engagement Convex 15 Gap 16 Stopper 17 Buffer 18 Hole

Claims (1)

[Claims] 1. A coupling portion (5) in which a hub (1) and a pulley (3) are connected via a bearing (2) and an elastic body (4) made of a rubber-like elastic material, and the hub (1) and A torque fluctuation absorbing damper including a torsional damper part (11) in which a mass body (10) is connected via an elastic body (9) made of a rubber-like elastic material, the pulley (3) and the mass body (10). Between the two members (3) and (10) with a thrust bearing (12) having an axial length (L) larger than the interval (c) between them, the mass body (10) is axially moved. Displacement and elastic deformation of the elastic body (9) connected thereto, and the thrust bearing (12) is pressed against the pulley (3) by an elastic restoring force in the axial direction due to the displacement and the elastic deformation. Absorb torque fluctuation damper.