JP2020051459A - Rotation fluctuation absorption damper - Google Patents

Abstract

To increase a possibility of diversion of a rotation fluctuation absorption damper and secure a sound absorption material arrangement space.SOLUTION: A rotation fluctuation absorption damper includes: a hub 11; a damper rubber holding member 21 fitted in the inner periphery side of an inner periphery side cylindrical part 14 in the hub 11; damper rubber 31 connected to the outer periphery side of an outer periphery cylinder part 24 in the damper rubber holding member 21; a damper mass 41 connected to the outer periphery side of the damper rubber 31; a coupling rubber holding member 51 fitted in the outer periphery side of the inner periphery side cylindrical part 14 in the hub 11; coupling rubber 61 connected to the coupling rubber holding member 51; a pulley 71 connected to the coupling rubber 61; a thrust bearing 81 disposed between an outer periphery side end surface part 15 in the hub 11 and an inner facing flange part 72 in the pulley 71; and a radial bearing 91 disposed between the outer periphery side cylindrical part 16 in the hub 11 and a cylinder part 73 in the pulley 71.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotation fluctuation absorbing damper.

  Conventionally, as shown in FIG. 3, a rotation provided with a damper portion 2 in which a damper mass 41 is connected to a hub 11 via a damper rubber 31 and a coupling portion 3 in which a pulley 71 is connected to the hub 11 via a coupling rubber 61. A fluctuation absorbing damper 1 is known. The pulley 71 has a pulley groove 74, and an endless belt (not shown) for transmitting torque to various auxiliary machines and the like is wound around the pulley groove 74.

  In the rotation fluctuation absorbing damper 1 having the above-described configuration, since the damper portion 2 that forms a resonance system that uses the damper rubber 31 as a spring and the damper mass 41 as an inertial mass body is provided, the damper portion 2 is generated on a rotating shaft such as a crankshaft. Is provided, and the coupling portion 3 which exhibits a vibration absorbing action due to the elasticity of the coupling rubber 61 is provided, so that vibration due to rotational fluctuation generated on a rotating shaft such as a crankshaft is provided. It is possible to reduce transmission.

WO2005 / 005865

  However, the rotational fluctuation absorbing damper 1 has room for improvement in the following points.

  In the rotation fluctuation absorbing damper 1, since the damper portion 2 is disposed on the inner peripheral side of the pulley 71 provided with the pulley groove 74 via the radial bearing 91, the damper mass 41 which is a component of the damper portion 2 has an outer diameter. Cannot be expanded. Therefore, the above-described rotation fluctuation absorbing damper 1 is diverted to an engine drive system of another model having a different resonance frequency of the crankshaft and thus different inertia mass to be set, and only the damper mass 41 is replaced with one that meets the specifications of the other model. It is considered difficult. Therefore, in the past, the entire rotation fluctuation absorbing damper 1 was unavoidably redesigned every time the model was changed. On the other hand, it is required to increase the diversion possibility of the rotation fluctuation absorption damper. Task).

  Further, in recent years, a sound absorbing material made of urethane foam or the like has been attached to an engine front cover in which the rotation fluctuation absorbing damper 1 is disposed in proximity to the engine to absorb radiation noise generated when the engine is driven. In this case, when the sound absorbing material is mounted on the outer surface of the engine front cover and the rotation fluctuation absorbing damper 1 is mounted on the crankshaft protruding from the engine front cover, the sound absorbing material becomes the inner periphery of the pulley 71 of the rotation fluctuation absorbing damper 1. (The inner peripheral side of the pulley groove 74). However, in the rotation fluctuation absorbing damper 1, as described above, since the damper portion 2 is disposed on the inner peripheral side of the pulley 71, the sound absorbing material cannot be disposed on the inner peripheral side of the pulley 71. Therefore, it is required to secure a sound absorbing material arrangement space for disposing the sound absorbing material on the inner peripheral side of the pulley 71 (the inner peripheral side of the pulley groove 74) in the rotation fluctuation absorbing damper 1 (a problem of securing the sound absorbing material arrangement space). .

  An object of the present invention is to increase the possibility of diverting a rotation fluctuation absorbing damper and secure a space for disposing a sound absorbing material.

  In order to solve the above problem, a rotation fluctuation absorbing damper according to the present invention includes a boss portion, an inner peripheral end surface portion provided radially outward from the boss portion, and one axial direction from the inner peripheral end surface portion. The inner peripheral side cylindrical portion provided to face, the outer peripheral side end surface portion provided radially outward from the inner peripheral side end surface portion or the inner peripheral side cylindrical portion, and the shaft from the outer peripheral side end surface portion. A hub integrally provided with an outer cylindrical portion provided in the other direction, an inner cylindrical portion fitted on the inner circumferential side of the inner cylindrical portion of the hub, and the inner cylindrical portion A damper rubber holding member integrally provided with an end face portion provided radially outward from the outer peripheral portion and an outer circumferential tube portion provided from the end face portion toward the other in the axial direction; and the outer circumferential tubular portion in the damper rubber holding member And a damper rubber connected to the outer peripheral side of the damper rubber. Damper mass, a cylindrical portion fitted on the outer peripheral side of the inner peripheral side cylindrical portion of the hub, and an outwardly directed flange portion provided radially outward from the cylindrical portion. A coupling rubber holding member, a coupling rubber connected to the other axial side of the outward flange portion of the coupling rubber holding member, and an inner side connected to the other axial side of the coupling rubber. A pulley that is provided in the axial direction from the inward flange portion to the other in the axial direction, and that integrally includes a cylindrical portion provided with a pulley groove, the outer peripheral end surface portion of the hub, and the inward direction of the pulley. A thrust bearing interposed between the flange portion and a radial bearing interposed between the outer cylindrical portion of the hub and the cylindrical portion of the pulley; Characterized in that it comprises a.

  Further, as an embodiment, in the above-mentioned rotation fluctuation absorbing damper, an open space in which the components of the rotation fluctuation absorbing damper are not disposed is set on an outer peripheral side of the damper mass.

  Further, as an embodiment, in the rotation fluctuation absorbing damper described above, an open space in which the components of the rotation fluctuation absorbing damper are not disposed is set on the inner peripheral side of the outer peripheral cylindrical portion of the hub. Features.

  Further, as an embodiment, in the rotation fluctuation absorbing damper described above, a rotation direction fail-safe stopper structure including a combination of a stopper protrusion provided on the hub and a stopper protrusion provided on the pulley is provided. It is characterized by the following.

  According to the present invention, with the above-described configuration, the possibility of diverting the rotation fluctuation absorbing damper can be increased, and the space for disposing the sound absorbing material can be secured.

Sectional perspective view of a rotation fluctuation absorbing damper according to an embodiment. (A) is a perspective view of a hub provided in the rotation fluctuation absorbing damper, and (B) is a sectional perspective view of a coupling part provided in the rotation fluctuation absorbing damper. Sectional view of a rotation fluctuation absorbing damper according to the background art

  As shown in FIG. 1, the rotation fluctuation absorbing damper 1 according to the embodiment includes a damper portion 2 in which a damper mass 41 is connected to a hub 11 via a damper rubber 31 and a pulley 71 via a coupling rubber 61 to the hub 11. This is a rotation fluctuation absorbing damper including the coupled coupling unit 3. The rotation fluctuation absorbing damper 1 according to the embodiment includes a damper portion 2 in which a damper rubber 41 is connected to a hub 11 via a damper rubber holding member 21 and a damper rubber 31, and a coupling rubber holding member 51 and a coupling rubber 61 are connected to the hub 11. And a coupling portion 3 to which a pulley 71 is connected via a rotation fluctuation absorbing damper. The rotation fluctuation absorbing damper is also called a torque fluctuation absorbing damper.

  Each component is configured as follows.

  The hub 11 has a cylindrical boss portion 12 fixed to a rotating shaft such as a crankshaft. The boss portion 12 extends radially outward from one axial end (left side, vehicle front side in the figure) of the boss portion 12. An annular inner peripheral end face portion 13 is integrally provided to face the inner peripheral side end face portion 13, and an inner peripheral side cylindrical portion 14 is integrally provided from the outer peripheral end of the inner peripheral side end face portion 13 to one side in the axial direction. Further, an annular outer peripheral end surface portion 15 is integrally provided radially outward from a root portion of the inner peripheral end surface portion 13 or the inner peripheral cylindrical portion 14, and from the outer peripheral end portion of the outer peripheral end surface portion 15. An outer cylindrical portion 16 is integrally provided in the other axial direction (to the right in the figure, toward the rear of the vehicle).

  The damper rubber holding member 21 includes an inner peripheral cylindrical portion 22 that is fitted to the inner peripheral side of the inner peripheral cylindrical portion 14 of the hub 11 from one side in the axial direction, and one end of the inner peripheral cylindrical portion 22 in the axial direction. An annular end face portion 23 is integrally provided radially outward from, and an outer peripheral cylindrical portion 24 is integrally provided from the outer peripheral end of the end face portion 23 toward the other side in the axial direction. The end face portion 23 is further disposed on one side in the axial direction than the tip of the inner peripheral side cylindrical portion 14 in the hub 11, and the outer peripheral cylindrical portion 24 is disposed on the outer peripheral side of the inner peripheral side cylindrical portion 14 in the hub 11. I have.

  The damper rubber 31 is formed in a cylindrical shape, is connected to the outer peripheral side of the outer peripheral cylindrical portion 24 of the damper rubber holding member 21, and is vulcanized and bonded to the outer peripheral surface of the outer peripheral cylindrical portion 24.

  The damper mass 41 is also formed in a cylindrical shape, is connected to the outer peripheral side of the damper rubber 31, and the inner peripheral surface of the damper mass 41 is vulcanized and bonded. The damper mass is also called a vibrating ring.

  Therefore, since the damper rubber 31 is thus vulcanized and bonded to the outer peripheral surface of the damper rubber holding member 21 and the inner peripheral surface of the damper mass 41, these three parts are formed into an integral vulcanized molded product, and the three parts are integrally formed. The damper part 2 is constituted by the vulcanized molded product.

  The coupling rubber holding member 51 includes a cylindrical portion 52 fitted to the outer peripheral side of the inner peripheral side cylindrical portion 14 of the hub 11 from one side in the axial direction. An outward flange portion 53 is integrally provided radially outward. The coupling rubber holding member 51 is disposed on the outer peripheral side of the inner peripheral side cylindrical portion 14 of the hub 11, and is disposed on the inner peripheral side of the outer peripheral cylindrical portion 24 of the damper rubber retaining member 21.

  The coupling rubber 61 is formed in a cylindrical shape, and one end in the axial direction is connected (vulcanized and bonded) to the outward flange 53 of the coupling rubber holding member 51, and the other end in the axial direction is a pulley. It is connected (vulcanized adhesion) to an inward flange portion 72 described later in 71. The coupling rubber 61 is pre-compressed in the axial direction between the coupling rubber holding member 51 and the pulley 71 in order to relieve the tensile stress when twisting greatly during damper assembly and to improve the durability of the rubber.

  The pulley 71 includes an inward flange portion 72 connected to the other axial side of the coupling rubber 61, and a cylindrical portion 73 is integrally provided from the outer peripheral end of the inward flange portion 72 toward the other axial direction. Have been. A pulley groove 74 for winding an endless belt (not shown) for transmitting torque to various auxiliary machines and the like is provided on the outer peripheral surface of the cylindrical portion 73.

  Accordingly, since the coupling rubber 61 is thus vulcanized and bonded to the coupling rubber holding member 51 and the pulley 71, these three parts are formed as an integral vulcanized molded product, and the three parts are integrally vulcanized. The coupling part 3 is constituted by a product.

  A thrust bearing 81 is interposed between the outer peripheral end face 15 of the hub 11 and the inward flange 72 of the pulley 71.

  A radial bearing 91 is interposed between the outer cylindrical portion 16 of the hub 11 and the cylindrical portion 73 of the pulley 71.

  No component of the rotation fluctuation absorbing damper 1 is arranged on the outer peripheral side of the damper mass 41, so that the outer peripheral side of the damper mass 41 is an open space 4.

  No component of the rotation fluctuation absorbing damper 1 is disposed on the inner peripheral side of the outer cylindrical portion 16 of the hub 11, so that the inner peripheral side of the outer cylindrical portion 16 is also the open space 5. Have been.

  As shown in FIG. 2A, an annular step 17 is provided at the outer peripheral end of the outer peripheral end face 15 of the hub 11, and a plurality of stopper protrusions 18 on the circumference are provided in the step 17 (in FIG. 2A). (3 equally distributed) are provided integrally. As shown in FIG. 2B, an annular step 77 is provided on the outer peripheral end of the inward flange 72 of the pulley 71 and on the inner peripheral side of the cylindrical section 73. Some of the stopper projections 78 are provided integrally (three in the figure).

  The stopper projections 18 on the hub 11 side and the stopper projections 78 on the pulley 71 side are alternately arranged on the same circumference, so that when the hub 11 and the pulley 71 rotate relative to each other by a predetermined angle, they come into contact with and engage with each other. It is possible. Therefore, the plurality of stopper projections 18 and 78 constitute a rotational direction fail-safe stopper structure that transmits torque instead of coupling rubber 61 when coupling rubber 61 is damaged or broken and transmission of torque is interrupted. ing.

  In the rotation fluctuation absorbing damper 1 having the above-described configuration, the damper part (torsional damper part) 2 that constitutes a resonance system using the damper rubber 31 as a spring and the damper mass 41 as an inertial mass body is provided. 2, it is possible to reduce the torsional vibration generated on the rotating shaft such as the crankshaft, and the coupling portion 3 which exhibits the vibration absorbing action by the elasticity of the coupling rubber 61 is provided. The ring portion 3 can reduce the transmission of vibrations due to rotation fluctuations generated on a rotating shaft such as a crankshaft.

  Further, according to the rotation fluctuation absorbing damper 1 having the above configuration, the following operation and effects are exhibited.

  The damper mass 41 is disposed on the outer peripheral side of the inner peripheral side cylindrical portion 14 of the hub 11 which faces in one axial direction, and the cylindrical portion 73 of the pulley 71 provided with the pulley groove 74 is disposed on the outer peripheral side of the hub 11 which faces the other axial direction. Since the damper mass 41 and the cylindrical portion 73 of the pulley 71 are arranged side by side in the axial direction and the outer peripheral side of the damper mass 41 is the open space 4, the outer diameter of the damper mass 41 It can be arbitrarily enlarged. Therefore, the rotation fluctuation absorbing damper 1 is diverted to another type of engine drive system having different resonance frequencies of the crankshafts and different inertia masses to be set, and only the damper mass 41 or the damper rubber holding member 21, the damper rubber 31, and the damper mass 41 are used. It is possible to replace only the integrated vulcanized molded product with a product that meets the specifications of another model. Therefore, the possibility of diverting the rotation fluctuation absorbing damper 1 can be increased.

  The damper rubber 31 and the damper mass 41 are arranged on the outer circumferential side of the inner circumferential side cylindrical portion 14 of the hub 11 which faces one axial direction, and the cylindrical portion 73 of the pulley 71 provided with the pulley groove 74 faces the other axial direction of the hub 11. Since the inner peripheral side of the outer peripheral side cylindrical portion 16 of the hub 11 is the open space 5, the inner peripheral side of the outer peripheral side cylindrical portion 16 of the hub 11 is formed. It is possible to secure an arrangement space for arranging a sound absorbing material (not shown).

  Since a rotational direction fail-safe stopper structure is provided by a combination of the stopper protrusion 18 provided on the hub 11 and the stopper protrusion 78 provided on the pulley 71, the coupling rubber 61 is damaged or broken by any chance and torque is reduced. Even if the transmission is interrupted, the torque can be transmitted from the hub 11 to the pulley 71 via the fail-safe stopper structure.

  Since the damper rubber holding member 21 is fitted to the inner peripheral side of the inner cylindrical portion 14 of the hub 11 and the coupling rubber holding member 51 is fitted to the outer peripheral side of the same inner cylindrical portion 14. The two holding members 21 and 51 are fitted so as to sandwich the hub 11 from the inner and outer circumferences. Therefore, the holding members 21 and 51 can be fitted to the hub 11 with a strong fastening force, and the radial reaction force accompanying the fitting is cancelled, thereby suppressing deformation of the hub 11 due to the radial reaction force. It is possible.

  Further, since the damper portion 2 is arranged on the outer peripheral side of the coupling rubber 61, and particularly the metal damper mass 41 is arranged, even if a stepping phenomenon occurs during running of the vehicle, the stepping stone collides with the damper mass 41 and the coupling rubber collides. It doesn't reach 61. Therefore, the coupling rubber 61 can be protected from stepping stones and the like, and it is possible to prevent the coupling rubber 61 from being damaged by the stepping stones.

  The rotation fluctuation absorbing damper of the present invention is used, for example, mounted on a crankshaft of an engine for a vehicle such as an automobile, and mounted on another rotating shaft.

DESCRIPTION OF SYMBOLS 1 Rotation fluctuation absorption damper 2 Damper part 3 Coupling part 4,5 Open space 11 Hub 12 Boss part 13 Inner peripheral end surface part 14 Inner peripheral cylindrical part 15 Outer peripheral end surface part 16 Outer peripheral cylindrical part 17,77 Step 18, 78 Stopper protrusion 21 Damper rubber holding member 22 Inner peripheral cylinder part 23 End face part 24 Outer peripheral cylinder part 31 Damper rubber 41 Damper mass 51 Coupling rubber retaining member 52 Cylindrical part 53, 72 Flange part 61 Coupling rubber 71 Pulley 73 Cylindrical part 74 Pulley groove 81 Thrust bearing 91 Radial bearing

Claims (4)

A boss portion, an inner peripheral end surface portion provided radially outward from the boss portion, an inner peripheral cylindrical portion provided axially from the inner peripheral end surface portion in the axial direction, the inner peripheral side An outer peripheral end surface portion provided radially outward from the end surface portion or the inner peripheral cylindrical portion and an outer peripheral cylindrical portion provided toward the other axial direction from the outer peripheral end surface portion are integrally formed. With the hub you set up,
An inner peripheral cylindrical portion fitted to the inner peripheral side of the inner peripheral cylindrical portion of the hub, an end surface portion provided radially outward from the inner peripheral cylindrical portion, and an axial direction from the end surface portion; A damper rubber holding member integrally provided with an outer peripheral cylindrical portion provided toward the other,
A damper rubber connected to the outer peripheral side of the outer peripheral cylindrical portion in the damper rubber holding member,
A damper mass connected to an outer peripheral side of the damper rubber;
Coupling rubber integrally provided with a cylindrical portion fitted to the outer peripheral side of the inner peripheral side cylindrical portion of the hub, and an outward flange portion provided radially outward from the cylindrical portion. A holding member;
Coupling rubber connected to the other axial side of the outward flange portion of the coupling rubber holding member,
An inward flange portion connected to the other side in the axial direction of the coupling rubber, and a pulley integrally provided with a cylindrical portion provided with a pulley groove, provided toward the other axial direction from the inward flange portion,
A thrust bearing interposed between the outer peripheral end surface of the hub and the inward flange of the pulley;
A radial bearing interposed between the outer cylindrical portion of the hub and the cylindrical portion of the pulley;
A rotation fluctuation absorbing damper comprising: The rotation fluctuation absorbing damper according to claim 1,
An open space in which components of the rotational fluctuation absorbing damper are not disposed is provided on an outer peripheral side of the damper mass. The rotation fluctuation absorbing damper according to claim 1,
The rotation fluctuation absorbing damper, wherein an open space in which the components of the rotation fluctuation absorbing damper are not disposed is set on an inner peripheral side of the outer cylindrical portion of the hub. The rotation fluctuation absorbing damper according to claim 1, 2 or 3,
A rotation fluctuation absorbing damper, comprising: a rotation direction fail-safe stopper structure including a combination of a stopper projection provided on the hub and a stopper projection provided on the pulley.

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