JPH09287647A - Torque fluctuation absorbing damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of hammering and breakage while a stopper part is operating by inserting an engaging protruding part protruding from a mass body in an engaging recessed part formed at a pulley, and connecting the mass body with a hub through an elastic body. SOLUTION: An engaging protruding part 13 which protrudes in the axial direction of a mass body 10 in a torsional damper part 11 is inserted in an engaging recessed part 12 formed at the stay part 3d of a pulley 3, and between them, a prescribed clearance is set in the rotational direction. A stopper part 15 operates so that the elastic body 4 of a coupling part 5 may not deformed excessively when it passes through the resonance point of the coupling part 5 at a rotational speed lower than idling speed. In other words, an engaging protruding part 13 comes into contact with one inner wall of the engaging recessed part 12, and the pulley 3 is made to stop relatively-rotating to a hub 1 further. The mass body 10 provided with the engaging protruding part 13 is connected with the hub 1 through a elastic body 9 made of rubber-like elastic material, therefore, it is possible to relieve generated impact by a buffering effect using the elastic body 9.

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 As shown in the graph of FIG. 11, if a torque fluctuation absorbing damper is mounted on a rotary drive system of an automobile engine or the like, the fluctuation fluctuation amplitude at idle rotation can be reduced. In the case of a certain number (at the time of starting or stopping), an excessive input acts on the elastic body of the coupling part to pass the resonance point of the coupling part, and the elastic body is excessively deformed. Therefore, in order to prevent the elastic body from being excessively deformed and damaged, the torque fluctuation absorbing damper is conventionally provided with a stopper that combines the unevenness on the hub 51 side and the unevenness on the pulley 52 side as shown in FIGS. 12 and 13. A section 53 is provided.

However, in this conventional technique, the stopper portion 53 is made of a rigid annular stopper member 54 fixed to the outer peripheral side of the hub 51, and the annular stopper made of a rigid material fixed to the inner peripheral side of the pulley 52. Since it is configured in combination with the member 55, as shown by the solid line in the graph of FIG. 14, an extremely large impact is generated at the pinpoint when the stopper portion 53 is actuated, which causes a large hammering sound or a stopper. There is a problem that the part 53 is damaged, and there is also a problem that the number of parts of the damper increases.

[0004]

SUMMARY OF THE INVENTION In view of the above points, the present invention provides a torque fluctuation absorbing damper having a coupling portion and a torsional damper portion, without generating a large hammering sound when the stopper portion is operated. An object of the present invention is to provide a torque fluctuation absorbing damper in which the stopper portion is not damaged and the number of parts of the damper does not increase.

[0005]

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 including a hub and a mass body connected via an elastic body made of a rubber-like elastic material, a torque fluctuation absorbing damper, wherein an engaging recess is provided in the pulley and the mass body projects in the axial direction. Providing an engaging protrusion inserted into the engaging recess,
A gap of a predetermined size in the rotation direction is set between the inner wall of the engagement recess and the engagement protrusion, and the engagement recess and the engagement protrusion cause excessive deformation of the elastic body of the coupling portion. We decided to provide a stopper in the rotation direction to prevent this.

[0006]

In the torque fluctuation absorbing damper of the present invention having the above-mentioned structure, the engaging convex portion constituting one of the stopper portions is provided on the mass body of the torsional damper portion, and this mass body is made of a rubber-like elastic material. Since it is connected to the hub via the elastic body, the elastic body exerts a cushioning effect when the stopper portion operates. Therefore, even if the pulley itself of the coupling portion provided with the mass body and the engaging recess is made of a rigid material,
Due to the cushioning effect of this elastic body, it is possible to make the stopper portion softer than before.

Further, the engaging convex portion constituting one of the stopper portions is provided on the mass body of the torsional damper portion originally provided for the damper, and the engaging concave portion constituting the other of the stopper portion is also the damper. Since it is provided on the pulley of the coupling portion originally provided, it is possible to reduce the number of parts of the damper as compared with the conventional one.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The pulley of the coupling portion is generally provided with a thinner stay portion for connecting the boss portion and the rim portion, so that the stay portion is engaged as an axially penetrating hole. It is preferable to provide a recess. Further, it is preferable that the hole is formed in an arc shape or a fan shape when viewed from the axial direction.

[0009]

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 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.

The stay portion 3 of the pulley 3 of the coupling portion 5
As shown in FIG. 2, the engaging recess 12 is provided as an arcuate or fan-shaped through hole as shown in FIG. 2 in the axial direction. The engaging recess 12 protrudes in the axial direction from the mass body 10 of the torsional damper portion 11. The engagement protrusion 13 inserted into the engagement recess 12 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 12 a of the engagement recess 12 and the engagement protrusion 13. A gap 14 in the rotation direction having a length θ is set, and a stopper portion 15 in the rotation direction is provided to prevent excessive deformation of the elastic body 4 of the coupling portion 5 by these gaps.

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 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 it operates as follows with the above configuration.

That is, the stopper portion 15 prevents the elastic body 4 of the coupling portion 5 from being excessively deformed when passing through the resonance point of the coupling portion 5 at a rotation speed lower than the idle rotation.
Is actuated, that is, the engagement protrusion 13 abuts on one inner wall 12a of the engagement recess 12 to stop the pulley 3 from rotating further relative to the hub 1. At this time, the stopper portion The engaging convex portion 13 constituting one of the parts 15 is provided on the mass body 10 of the torsional damper portion 11, and the mass body 10 interposes the elastic body 9 made of a rubber-like elastic material on the hub 1
The elastic body 9 acts as a buffer when the stopper 15 is activated. Therefore, even if the mass body 10 provided with the engagement protrusion 13 and the pulley 3 itself provided with the engagement recess 12 are made of a rigid material, the cushioning effect of the elastic body 9 softens the contact of the stopper portion 15 as compared with the conventional case. The stopper 1
The magnitude of the impact generated during the operation of No. 5 can be made smaller than in the conventional case as shown by the chain line in FIG. Therefore, the amount of tapping sound generated when the stopper portion 15 is activated can be made smaller than before, and the stopper portion 15 can be prevented from being damaged, and a damper product excellent in quietness and durability is provided. be able to.

Further, the engaging convex portion 13 constituting one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11 originally provided for the damper, and the engaging convex portion constituting the other of the stopper portion 15 is provided. Since the concave portion 12 is provided in the pulley 3 of the coupling portion 5 that is also originally provided in the damper, the number of parts of the damper can be reduced as compared with the conventional example having the dedicated stopper member.

Further, since the engaging convex portion 13 which constitutes one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11, the mass convex portion 13 corresponds to the engaging convex portion 13.
The inertial mass set to 0 can be increased. Further, since the engaging convex portion 13 is arranged on the inner peripheral side of the rim portion 3b of the pulley 3, the torsion damper portion 11 can be accommodated in a limited space occupied by the damper without increasing the size of the entire damper. The inertial mass can be increased.

Second Embodiment As shown in FIG. 3, a pulley 3 is rotatably connected to the 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 stay portion 3 of the pulley 3 of the coupling portion 5
As shown in FIG. 4, the engaging recess 12 is provided as a circular arc-shaped or fan-shaped through hole when viewed from the axial direction, and the engaging concave portion 12 projects axially in the mass body 10 of the torsional damper portion 11. The engagement protrusion 13 to be inserted into the engagement recess 12 is provided as an arc-shaped or fan-shaped protrusion when viewed in the axial direction, and a cushioning member 16 made of a rubber-like elastic material is added to the surface of the engagement protrusion 13. A rotational gap 14 of a predetermined size θ is set between the engaging projection 13 including the cushioning body 16 and the inner wall 12a of the engaging recess 12, which are elastically bonded to each other. 4 is provided with a stopper portion 15 in the rotational direction for preventing excessive deformation. The cushioning body 16 is integrally molded with the elastic body 9 to cover the entire engaging convex portion 13, but in view of its function, it only covers the surfaces of the engaging convex portion 13 in the rotation direction (both sides). May be.

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 it operates as follows with the above configuration.

That is, the stopper portion 15 prevents the elastic body 4 of the coupling portion 5 from being excessively deformed when passing through the resonance point of the coupling portion 5 at a rotation speed equal to or lower than the idle rotation.
Is actuated, that is, the engagement protrusion 13 abuts on one inner wall 12a of the engagement recess 12 to stop the pulley 3 from rotating further relative to the hub 1. At this time, the stopper portion The engaging convex portion 13 constituting one of the parts 15 is provided on the mass body 10 of the torsional damper portion 11, and the mass body 10 interposes the elastic body 9 made of a rubber-like elastic material on the hub 1
The elastic body 9 acts as a buffer when the stopper 15 is activated. Also, the engaging protrusion 1
Since the cushioning body 16 made of a rubber-like elastic material is vulcanized and adhered to the side surface in the rotation direction of 3, the cushioning effect of this cushioning body 16 also acts when the stopper portion 15 operates. Therefore, the mass body 10 provided with the engagement protrusion 13 and the engagement recess 1
Even if the pulley 3 itself provided with 2 is made of a rigid material, it is possible to soften the contact of the stopper portion 15 by two steps as compared with the conventional case due to the cushioning effect of the elastic body 9 and the cushioning effect of the cushioning body 16. Therefore, the stopper 1
The magnitude of the shock generated during the operation of No. 5 can be made smaller than in the conventional case as shown by the dotted line in FIG. Therefore, the amount of tapping sound generated when the stopper portion 15 is activated can be made smaller than before, and the stopper portion 15 can be prevented from being damaged, so that a damper product excellent in quietness and durability is provided. be able to.

Further, the engaging convex portion 13 constituting one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11 originally provided in the damper, and the engaging convex portion constituting the other of the stopper portion 15 is provided. Since the concave portion 12 is provided in the pulley 3 of the coupling portion 5 that is also originally provided in the damper, the number of parts of the damper can be reduced as compared with the conventional example having the dedicated stopper member.

Further, since the engaging convex portion 13 constituting one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11, the mass convex portion 13 corresponds to the engaging convex portion 13.
The inertial mass set to 0 can be increased. Further, since the engaging convex portion 13 is arranged on the inner peripheral side of the rim portion 3b of the pulley 3, the torsion damper portion 11 can be accommodated in a limited space occupied by the damper without increasing the size of the entire damper. The inertial mass can be increased.

Third Embodiment As shown in FIG. 5, a pulley 3 is rotatably connected to the 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 thrust bearing 17 made of synthetic resin and having an annular shape.
And the thrust bearing 17 is interposed so that the mass body 10 is axially displaced from the position of the chain line before the thrust bearing 17 is interposed to the position of the solid line after the insertion. The pulley 3 is pressed against the bearing 2 by the elastic force (reaction force) of the elastic body 9 accompanying this, so that there is no axial rattling in the rotatable coupling structure including the hub 1, the bearing 2 and the pulley 3. It has become.

The stay portion 3 of the pulley 3 of the coupling portion 5
As shown in FIG. 6, an engaging recess 12 is provided as a through hole having an arc shape or a fan shape as viewed in the axial direction. The engaging recess 12 projects axially from the mass body 10 of the torsional damper portion 11. The engagement protrusion 13 inserted into the engagement recess 12 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 12 a of the engagement recess 12 and the engagement protrusion 13. A gap 14 in the rotation direction having a length θ is set, and a stopper portion 15 in the rotation direction is provided to prevent excessive deformation of the elastic body 4 of the coupling portion 5 by these gaps.

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 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 it operates as follows with the above configuration.

That is, the stopper portion 15 prevents the elastic body 4 of the coupling portion 5 from being excessively deformed when passing through the resonance point of the coupling portion 5 at a rotation speed equal to or lower than the idle rotation.
Is actuated, that is, the engagement protrusion 13 abuts on one inner wall 12a of the engagement recess 12 to stop the pulley 3 from rotating further relative to the hub 1. At this time, the stopper portion The engaging convex portion 13 constituting one of the parts 15 is provided on the mass body 10 of the torsional damper portion 11, and the mass body 10 interposes the elastic body 9 made of a rubber-like elastic material on the hub 1
The elastic body 9 acts as a buffer when the stopper 15 is activated. Therefore, even if the mass body 10 provided with the engagement protrusion 13 and the pulley 3 itself provided with the engagement recess 12 are made of a rigid material, the cushioning effect of the elastic body 9 softens the contact of the stopper portion 15 as compared with the conventional case. The stopper 1
It is possible to reduce the magnitude of the impact generated during the operation of No. 5 as compared with the prior art. Therefore, the amount of tapping sound generated when the stopper portion 15 is activated can be made smaller than before, and the stopper portion 15 can be prevented from being damaged, and a damper product excellent in quietness and durability is provided. be able to.

Further, the engaging convex portion 13 forming one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11 originally provided in the damper, and the engaging convex portion forming the other side of the stopper portion 15 is provided. Since the recess 12 is provided in the pulley 3 of the coupling portion 5 which is also originally provided in the damper, even if the number of thrust bearings 17 is subtracted, the number of parts of the damper is
The number can be reduced as compared with the conventional example having a dedicated stopper member.

Further, since the engaging convex portion 13 forming one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11, the mass convex portion 13 corresponds to the engaging convex portion 13.
The inertial mass set to 0 can be increased. Further, since the engaging convex portion 13 is arranged on the inner peripheral side of the rim portion 3b of the pulley 3, the torsion damper portion 11 can be accommodated in a limited space occupied by the damper without increasing the size of the entire damper. The inertial mass can be increased.

Fourth Embodiment As shown in FIG. 7, 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 thrust bearing 18 made of synthetic resin and having an annular shape is formed.
Is interposed, and the thrust bearing 18 is interposed so that the mass body 10 is axially displaced from the position of the chain line before the thrust bearing 18 is interposed to the position of the solid line after the insertion. The pulley 3 is pressed against the bearing 2 by the elastic force (reaction force) of the elastic body 9 accompanying this, so that there is no axial rattling in the rotatable coupling structure including the hub 1, the bearing 2 and the pulley 3. It has become.

Stay portion 3 of pulley 3 of coupling portion 5
As shown in FIG. 8, the engaging recessed portion 12 is provided as a circular arc-shaped or fan-shaped through hole as shown in FIG. 8 in the d direction. The engaging recessed portion 12 projects in the axial direction in the mass body 10 of the torsional damper portion 11. The engagement protrusion 13 to be inserted into the engagement recess 12 is provided as an arc-shaped or fan-shaped protrusion when viewed from the axial direction, and the surface of the engagement protrusion 13 excluding the tip end surface is made of synthetic resin. A gap 14 in the rotational direction having a predetermined size θ is set between the engaging projection 13 including the cushioning body 19 and the inner wall 12a of the engaging recess 12, and the elastic body of the coupling portion 5 is formed by these. 4 is provided with a stopper portion 15 in the rotational direction for preventing excessive deformation. The cushioning member 19 is integrally molded with the thrust bearing 18 and covers the entire engaging projection 13 except the tip end surface.
It may be only to cover the surface (both side surfaces) in the rotational direction of 3. The thrust bearing 18 and the buffer body 19 are provided with holes 20 for inserting the engaging protrusions 13.

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 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 it operates as follows with the above configuration.

That is, the stopper portion 15 prevents the elastic body 4 of the coupling portion 5 from being excessively deformed when passing through the resonance point of the coupling portion 5 at a rotation speed equal to or lower than the idle rotation.
Is actuated, that is, the engagement protrusion 13 abuts on one inner wall 12a of the engagement recess 12 to stop the pulley 3 from rotating further relative to the hub 1. At this time, the stopper portion The engaging convex portion 13 constituting one of the parts 15 is provided on the mass body 10 of the torsional damper portion 11, and the mass body 10 interposes the elastic body 9 made of a rubber-like elastic material on the hub 1
The elastic body 9 acts as a buffer when the stopper 15 is activated. Also, the engaging protrusion 1
Since the side surface in the rotating direction of 3 is covered with the buffer body 19 made of synthetic resin, the buffer body 1 is operated when the stopper portion 15 is operated.
The buffering effect of 9 also works. Therefore, even if the mass body 10 provided with the engaging convex portion 13 and the pulley 3 itself provided with the engaging concave portion 12 are made of a rigid material, the stopper portion 15 is provided by the cushioning effect of the elastic body 9 and the cushioning effect of the cushioning body 19. The hit can be softened in two steps as compared with the conventional one, and thus the magnitude of the impact generated when the stopper portion 15 is operated can be made smaller than the conventional one. Therefore, the amount of tapping sound generated when the stopper portion 15 is activated can be made smaller than before, and the stopper portion 15 can be prevented from being damaged, and a damper product excellent in quietness and durability is provided. be able to.

Further, the engaging convex portion 13 constituting one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11 originally provided for the damper, and the engaging convex portion constituting the other of the stopper portion 15 is provided. Since the concave portion 12 is provided in the pulley 3 of the coupling portion 5 that is also originally provided in the damper, even if the number of thrust bearings 18 is subtracted,
The number can be reduced as compared with the conventional example having a dedicated stopper member.

Further, since the engaging convex portion 13 forming one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11, the mass convex portion 13 corresponds to the engaging convex portion 13.
The inertial mass set to 0 can be increased. Further, since the engaging convex portion 13 is arranged on the inner peripheral side of the rim portion 3b of the pulley 3, the torsion damper portion 11 can be accommodated in a limited space occupied by the damper without increasing the size of the entire damper. The inertial mass can be increased.

Fifth Embodiment As shown in FIG. 9, a support plate 21 is provided on the outer peripheral side of the hub 1.
A pulley 3 is rotatably connected via a ball type bearing 2 and an elastic body (also referred to as coupling rubber) 4 made of a rubber-like elastic material is provided between the hub 1 and the pulley 3.
Is provided, and a coupling portion 5 that absorbs torque fluctuations in a low rotation range is provided by them. The hub 1, the support plate 21, and the pulley 3 are each formed in a ring shape by a predetermined rigid material such as metal.
Is integrally provided with a stay portion 3d thinner than these 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. 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. Set the outer sleeve 7 to the pulley 3
By being fitted on the inner peripheral side of the rim portion 3b, it is interposed between the hub 1 and the pulley 3. In this embodiment, unlike the above-mentioned first to fourth embodiments, the elastic body 4 is arranged between the pulley 3 and the torsional damper portion 11 described later.

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.

Stay part 3 of pulley 3 of coupling part 5
As shown in FIG. 10, the engaging recess 12 is provided as an arcuate or fan-shaped through hole in the axial direction, and the engaging recess 22 is also formed in the elastic body 4 in the arcuate shape in the axial direction. -Shaped or fan-shaped through-holes, and engaging protrusions 13 that project in the axial direction and are inserted into the engaging recesses 12 and 22 are formed in the mass body 10 of the torsional damper portion 11 when viewed from the axial direction. The engaging recess 1 is provided as an arc-shaped or fan-shaped protrusion.
A gap 14 in the rotation direction having a predetermined size θ is set between the inner wall 12a of the second member 2 and the engaging projection 13, and the stopper 14 in the rotation direction prevents excessive deformation of the elastic body 4 of the coupling portion 5 by these. Is provided. Further, between the inner wall 22a of the engaging concave portion 22 and the engaging convex portion 13, a gap 23 in the rotation direction having a size θ ′ smaller than the size θ of the gap 14 is set, and the engaging convex portion is generated during rotational displacement. 13 first comes into contact with the inner wall 22a of the engaging concave portion 22 and presses the inner wall 22a of the engaging concave portion 22, and comes into contact with the inner wall 12a of the engaging concave portion 12.

The torque fluctuation absorbing damper having the above structure is mounted, for example, on 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 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 it operates as follows with the above configuration.

That is, the stopper portion 15 prevents the elastic body 4 of the coupling portion 5 from being excessively deformed when passing through the resonance point of the coupling portion 5 at a rotation speed equal to or lower than the idle rotation.
Is actuated, that is, the engagement protrusion 13 abuts on one inner wall 12a of the engagement recess 12 to stop the pulley 3 from rotating further relative to the hub 1. At this time, the stopper portion The engaging convex portion 13 constituting one of the parts 15 is provided on the mass body 10 of the torsional damper portion 11, and the mass body 10 interposes the elastic body 9 made of a rubber-like elastic material on the hub 1
The elastic body 9 acts as a buffer when the stopper 15 is activated. Further, prior to this, the engagement protrusion 13 first contacts the inner wall 22a of the engagement recess 22 and presses the inner wall 22a of the engagement recess 22, and the inner wall 12a of the engagement recess 12 is pressed.
The elastic body 4 also has a cushioning effect when the stopper 15 is actuated. Therefore, even if the mass body 10 provided with the engaging convex portion 13 and the pulley 3 itself provided with the engaging concave portion 12 are made of a rigid material, the stopper portion 15 is provided by the cushioning effect of the elastic body 9 and the cushioning effect of the elastic body 4. The hit can be softened in two steps as compared with the conventional one, and thus the magnitude of the impact generated when the stopper portion 15 is operated can be made smaller than the conventional one. Therefore, the amount of tapping sound generated when the stopper portion 15 is activated can be made smaller than before, and the stopper portion 15 can be prevented from being damaged, so that a damper product excellent in quietness and durability is provided. be able to.

Further, the engaging convex portion 13 forming one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11 originally provided in the damper, and the engaging convex portion forming the other side of the stopper portion 15 is provided. Since the concave portion 12 is provided in the pulley 3 of the coupling portion 5 that is also originally provided in the damper, even if the number of the support plates 21 is subtracted, the number of parts of the damper is reduced and a dedicated stopper member is provided. It can be reduced compared to the conventional example.

Further, since the engaging convex portion 13 forming one of the stopper portions 15 is provided on the mass body 10 of the torsional damper portion 11, the mass convex portion 13 corresponds to the engaging convex portion 13.
The inertial mass set to 0 can be increased. Further, since the engaging convex portion 13 is arranged on the inner peripheral side of the rim portion 3b of the pulley 3, the torsion damper portion 11 can be accommodated in a limited space occupied by the damper without increasing the size of the entire damper. The inertial mass can be increased.

[0047]

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 engaging convex portion forming one of the stopper portions is provided on the mass body of the torsional damper portion, and this mass body is made of rubber-like elastic material. Since the elastic member is connected to the hub via the elastic member, the elastic member exerts a cushioning effect when the stopper portion is activated. Therefore, even if the mass body and the pulley of the coupling portion provided with the engaging recess are made of a rigid material, the cushioning effect of this elastic body makes it possible to soften the contact of the stopper portion compared to the conventional one. It is possible to reduce the magnitude of the impact generated during the operation of the. Therefore, it is possible to provide a damper product excellent in quietness and durability because it is possible to reduce the volume of the tapping sound generated when the stopper portion is activated, to prevent the stopper portion from being damaged. it can.

Further, the engaging convex portion constituting one of the stopper portions is provided on the mass body of the torsional damper portion originally provided in the damper, and the engaging concave portion constituting the other of the stopper portion is also the damper. Since it is provided on the pulley of the coupling portion originally provided, the number of parts of the damper can be reduced as compared with the conventional example having the dedicated stopper member.

Further, since the engaging convex portion constituting one of the stopper portions is provided on the mass body of the torsional damper portion, the inertial mass set in the mass body is increased by the amount corresponding to the engaging convex portion. be able to. Further, since the engaging convex portion is arranged on the inner peripheral side of the rim portion of the pulley, the inertial mass of the torsional damper portion is increased within the limited space occupied by the damper without increasing the size of the entire damper. Can be made.

[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 sectional view taken along line AA in FIG.

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

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a half sectional view of a torque fluctuation absorbing damper according to a third embodiment of the present invention.

6 is a sectional view taken along line CC in FIG. 5;

FIG. 7 is a half sectional view of a torque fluctuation absorbing damper according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view taken along line DD in FIG.

FIG. 9 is a half sectional view of a torque fluctuation absorbing damper according to a fifth embodiment of the present invention.

10 is a sectional view taken along line EE in FIG.

FIG. 11 is a graph showing the relationship between engine speed and rotation fluctuation amplitude.

FIG. 12 is a half-cut sectional view of a torque fluctuation absorbing damper according to a conventional example.

FIG. 13 is a sectional view of an essential part of the torque fluctuation absorbing damper.

FIG. 14 is a graph showing the relationship between time and impact torque.

[Explanation of symbols]

 1 hub 2 bearing 3 pulley 3a boss part 3b rim part 3c, 10a belt engaging groove 3d stay part 4, 9 elastic body 5 coupling part 6 inner sleeve 7 outer sleeve 8 mass body 11 torsional damper part 12, 22 Engagement recesses 12a, 22a Inner wall 13 Engagement projections 14, 23 Gap 15 Stopper part 16, 19 Buffer body 17, 18 Thrust bearing 20 Hole 21 Support plate

Front page continuation (72) Inventor Koichi Ogishima 4-3-1 Tsujido Shinmachi, Fujisawa-shi, Kanagawa NOK Megrastic Stock Association In-house (72) Inventor Fumiaki Toko 4 Tsujido-shinmachi, Fujisawa-shi, Kanagawa 3-1 NOK Megrastic Stock Association In-house

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 portion (11) in which a mass body (10) is connected via an elastic body (9) made of a rubber-like elastic material, wherein an engaging recess (12) is formed in the pulley (3). ) And an engaging projection (13) projecting in the axial direction in the mass body (10) and inserted into the engaging recess (12), and an inner wall (12a) of the engaging recess (12). A gap (14) of a predetermined size (θ) in the rotation direction is set between the engaging protrusions (13), and the cup is formed by the engaging recesses (12) and the engaging protrusions (13). Stroke in the rotational direction that prevents excessive deformation of the elastic body (4) of the ring part (5) Torque fluctuation absorbing damper, characterized in that provided path portion (15).