JP2011112171A - Torque fluctuation absorption damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate, in a torque fluctuation absorption damper including a coupling section and a damper section, detachment operation of the damper from a rotating shaft. <P>SOLUTION: The torque fluctuation absorption damper includes the coupling section, the damper section, and a hub for fitting and holding the coupling section and the damper section, the hub being attachable to and detachable from the rotating shaft. The hub has a flange portion formed at one axial end of a cylindrical part to which the coupling section is fitted in an integrated manner to protrude radially outside. The flange portion has a tool assembling structure for assembling a detachment tool in detachment of the damper from the rotating shaft. The tool assembling structure is formed of, for example, a required number of threaded holes provided at the flange portion. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a torque fluctuation absorbing damper having a coupling portion and a damper portion. The torque fluctuation absorbing damper of the present invention is mounted on, for example, an engine crankshaft or mounted on another rotating shaft.

  Conventionally, as shown in FIG. 4, a torque fluctuation absorbing damper 51 having a coupling part 52 that reduces vibration transmission due to torque fluctuation of a rotating shaft and a damper part 56 that reduces vibration due to torsional resonance is known. The coupling part 52 has a configuration in which a pulley 55 is connected to the outer peripheral side of the inner peripheral cylindrical part 59 a of the hub 59 via a sleeve 53 and a coupling rubber 54, and the damper part 56 is an outer peripheral cylindrical part 59 b of the hub 59. The vibration ring 58 is connected to the outer peripheral side of this through a damper rubber 57.

  However, the following disadvantages are pointed out in the above conventional technique.

  That is, when the torque fluctuation absorbing damper 51 is attached to the tip of the crankshaft, the left hand in the figure is the front side A and the right hand in the figure is the engine side B. The crankshaft extends from the right hand side of the figure, and has a small-diameter shaft portion with a male screw at the tip thereof. The small-diameter shaft portion is inserted into the inner periphery of the boss portion 59c of the hub 59, and a nut is inserted from the left hand. Tightened. The torque fluctuation absorbing damper 51 thus mounted is sometimes detached from the crankshaft as necessary for maintenance or the like, and is removed in the direction of the left hand in the figure when being removed. However, as shown in the figure, the inner peripheral cylindrical portion 59a of the hub 59, the sleeve 53, the coupling rubber 54, and the pulley 55 are arranged in this order on the end surface portion of the left hand of the damper 51. No jig assembling portion for assembling the jig is provided. Therefore, the removal work of the damper 51 is a very troublesome work, and countermeasures are required.

Japanese Patent No. 4006582 (FIG. 2)

  In view of the above, it is an object of the present invention to provide a torque fluctuation absorbing damper having a coupling part and a damper part that can facilitate the removal work. In addition, another object of the present invention is to provide a torque fluctuation absorbing damper capable of suppressing the occurrence of a heat storage phenomenon due to the operation of the coupling rubber and improving its durability. In addition to this, an object of the present invention is to provide a torque fluctuation absorbing damper that can prevent the pulley from falling off the damper and prevent the peripheral equipment and the vehicle body from being damaged due to the pulley falling off. To do.

  In order to achieve the above object, a torque fluctuation absorbing damper according to claim 1 of the present invention includes a coupling part for reducing vibration transmission due to torque fluctuation of a rotating shaft, a damper part for reducing vibration due to torsional resonance, and the coupling. And a hub for fitting and holding the damper portion, wherein the hub is a torque fluctuation absorbing damper that is detachably attached to the rotating shaft, and the hub is a cylindrical shape that fits the coupling portion A jig assembly structure for integrally attaching a flange portion to one end portion in the axial direction of the portion in a radially outward direction, and for attaching the removal jig when the flange portion is removed from the rotating shaft. It is characterized by having.

  The torque fluctuation absorbing damper according to claim 2 of the present invention is the torque fluctuation absorbing damper according to claim 1, wherein the jig assembling structure includes a required number of screw holes provided in the flange portion. It is characterized by.

  The torque fluctuation absorbing damper according to claim 3 of the present invention is the torque fluctuation absorbing damper according to claim 1 or 2, wherein a part of the flange portion is cut out in a tongue shape in the thickness direction. The air flow feed structure is combined with the tubular portion at the time of rotation. An air flow is blown toward the coupling rubber of the coupling portion to suppress the temperature rise of the cup link rubber.

  The torque fluctuation absorbing damper according to claim 4 of the present invention is the torque fluctuation absorbing damper according to claim 1, 2, or 3, wherein the flange portion has an outer diameter dimension that is the inner diameter of the pulley of the coupling portion. A stopper structure having a flange outer peripheral edge as a stopper is also set by setting the dimension larger than the dimension, and the stopper structure suppresses the pulley from dropping from the damper.

  Furthermore, the torque fluctuation absorbing damper according to claim 5 of the present invention is the torque fluctuation absorbing damper according to claim 1, 2, 3 or 4, wherein the hub is formed of a sheet metal press product. And

  In the torque fluctuation absorbing damper configured as described above, the coupling portion and the shape of the hub that fits and holds the damper portion are directed radially outward at one axial end of the cylindrical portion that fits the coupling portion. The flange portion is integrally provided, and a jig assembling structure for assembling a removal jig when the damper is removed from the rotating shaft is provided on the flange portion. Therefore, when the damper is removed, it is possible to detach the damper by assembling the jig into the jig assembling structure, and thereby the damper can be easily removed. As a specific example of the jig assembly structure, a required number of screw holes are provided in the flange portion.

  Further, the flange portion is provided over the entire circumference, while the jig assembly structure is provided on a part of the circumference even when this is a screw hole, so that the flange portion effectively utilizes the remaining portion. Is reasonable. As a situation, the flange portion is integrally provided at the end portion of the cylindrical portion, and the coupling portion is fitted to the cylindrical portion, so that the flange portion is aligned with the coupling portion in the axial direction. Therefore, a part of the flange part is cut out in a tongue shape and raised in the thickness direction to provide an air flow feed structure with the raised part as a fin and the raised mark as a vent hole. An air flow is blown toward the coupling rubber of the coupling portion to suppress the temperature rise of the cup link rubber. Thus, an air cooling mechanism for the coupling rubber is set. Also, by setting the outer diameter dimension of the flange portion to be larger than the inner diameter dimension of the pulley of the coupling portion, a stopper structure having the flange outer peripheral edge portion as a stopper is provided, and this pulley structure causes the pulley to drop from the damper. Suppress. Thereby, a drop-off preventing mechanism for the pulley is set. In addition, in order to provide a screw hole in the flange portion or to cut out a part of the flange portion on a flat surface in the shape of a tongue and raise it in the thickness direction, the hub is preferably a sheet metal press product rather than a cast article. .

  The present invention has the following effects.

  That is, according to the present invention having the above-described configuration, it is possible to easily remove the damper by attaching the jig to the jig assembling structure provided on the flange portion of the hub and pulling out the damper at the time of removing the damper. Yes. Therefore, the operation of removing the damper can be facilitated. Further, by providing the flange portion with an air flow feeding structure in the form of a tongue piece rising, the temperature rise of the coupling rubber can be suppressed and the durability thereof can be enhanced. In addition, by increasing the outer diameter of the flange part and providing a stopper structure, it is possible to suppress the pulley from falling off the damper, thereby preventing the pulley from popping out and damaging peripheral devices or the vehicle body. Can do. In addition, by making the hub a sheet metal press product, it is possible to easily process the jig assembly structure, air flow feed structure or stopper structure into the hub, and acquire functions by increasing the number of damper parts. can do.

Sectional drawing of the torque fluctuation absorption damper which concerns on the Example of this invention Perspective view with a part cut away of a hub provided in the damper Sectional drawing of the torque fluctuation absorption damper which concerns on the other Example of this invention. Sectional view of a torque fluctuation absorbing damper according to a conventional example

The present invention includes the following embodiments.
(A) The present invention relates to a torque fluctuation absorbing damper (decoupled damper pulley).
(B) Configuration (1) The sheet metal part fastened to the crankshaft has an L-shaped front end surface.
(2) A fitting portion capable of press-fitting a coupling rubber vulcanized product is provided between the engine-side end surface and the front-side end surface of the part (1).
(3) Two or more screw holes for pulley removal are provided on the front end face of the part (1).
(4) Air holes are provided in the front end face of the part (1) above to suck in air during product rotation.
(C) Effect By providing the above components, the pulley can be removed during service, the heat dissipation of the coupling rubber can be improved, and the coupling rubber vulcanized product can be fitted.

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

  FIG. 1 shows a torque fluctuation absorbing damper 1 according to an embodiment of the present invention, and the damper 1 according to this embodiment is configured as follows. The damper 1 is mounted on an engine crankshaft (not shown). In the mounted state, the left hand in the figure is the front side A and the right hand is the engine side B.

  That is, the damper 1 includes a coupling portion 11 that reduces vibration transmission due to torque fluctuation of the rotating shaft (crankshaft), a damper portion (dynamic damper portion / dynamic vibration absorption portion) 21 that reduces vibration due to torsional resonance, The coupling portion 11 and the damper portion 21 are each provided with a hub 31 for fitting and holding. The hub 31 is formed of a sheet metal press product and is detachable from the rotating shaft. Further, the hub 31 is integrally formed with a flange portion 31d toward the outer side in the radial direction at one end of the cylindrical portion 31c for fitting the coupling portion 11 in the axial direction (left hand, ie, the front side A in the figure). The flange 31d is provided with a jig assembly structure 41 for assembling a removal jig (not shown) when the damper 1 is removed from the rotary shaft. Specifically, the assembly structure 41 is formed by a required number of screw holes 42 provided in the flange portion 31d.

  Further, as shown in FIG. 2, the flange portion 31d is partially cut out in the shape of a tongue and raised in the thickness direction of the flange so that the rising portion (the rising piece) becomes a fin 45 and stands up. An air flow feed structure 44 having a raised mark as a vent hole 46 is provided, and this air flow feed structure 44 is coupled to the coupling rubber 13 of the coupling portion 11 fitted to the cylindrical portion 31c of the hub 31 during rotation. The temperature rise of the cup link rubber 13 is suppressed by blowing an air flow toward the head.

Further, the flange portion 31d, the stopper structure 47, the stopper 48 a flange outer peripheral part by setting larger than the inner diameter d ₂ of the pulley 14 of the coupling portion 11 and the outer diameter d ₁ is provided, The stopper structure 47 is configured to prevent the pulley 14 from dropping from the damper 1 in the left-hand direction in the figure.

  Each of the above components is configured as follows.

  That is, first, the hub 31 is formed as a processed product of a sheet metal press as described above, and is detachably attached to the rotating shaft, and has a small-diameter cylindrical portion 31a that is a boss portion at the time of attachment. The end surface portion 31b is integrally formed from one axial end of the small diameter cylindrical portion 31a outward in the radial direction, and the cylindrical portion 31c is integrally molded from the outer peripheral end of the end surface portion 31b toward one axial direction. A flange portion 31d is integrally formed from one end portion in the axial direction of the cylindrical portion 31c outward in the radial direction. The cylindrical portion 31c forms a cylindrical holding portion for fitting and holding the coupling portion 11 on the outer peripheral side thereof, and the small diameter cylindrical portion 31a and the end surface portion 31b are fitted and held on the outer peripheral side of the damper portion 21. The step-shaped holding part is formed.

  The coupling portion 11 is disposed on the outer peripheral side of the hub 31 as a whole and on the other axial side of the flange portion 31d (right hand, ie, engine side B in the figure). A sleeve 12 fitted to the outer peripheral surface is provided, a coupling rubber 13 is connected to the outer peripheral surface of the sleeve 12, and a pulley 14 is connected to the outer peripheral surface of the coupling rubber 13, and these three parts 12, 13, 14 is molded as an integral vulcanized molded product. The pulley 14 includes an inner peripheral cylindrical portion 14a connected to the coupling rubber 13, an end surface portion 14b integrally formed radially outward from one axial end portion of the inner peripheral cylindrical portion 14a, and an end surface. An outer peripheral cylindrical portion 14c integrally formed from the outer peripheral end portion of the portion 14b toward the other side in the axial direction is integrally formed to have a substantially U-shaped cross section, and the outer peripheral cylindrical portion 14c has an endless belt ( A pulley groove 14d for winding a not-shown) is provided.

  The damper portion 21 is disposed on the outer peripheral side of the hub 31 as a whole and on the other axial side of the coupling portion 11, and is in a state of abutting the end surface portion 31 b on the outer peripheral surface of the small diameter cylindrical portion 31 a of the hub 31. And a damper rubber 23 is connected to the outer peripheral surface of the flange member 22, and a vibration ring (inertial mass body) 24 is connected to the outer peripheral surface of the damper rubber 23. , 24 as a press-fit type dynamic damper. The flange member 22 has an end surface portion 22a fitted to the hub 31 with an inner peripheral end portion, and a cylindrical portion 22b integrally formed from the outer peripheral end portion of the end surface portion 22a toward one axial direction. Thus, it is formed in a substantially L-shaped cross section. The cylindrical portion 22b is disposed on the outer peripheral side of the inner peripheral cylindrical portion 14a of the pulley 14 via a predetermined radial gap, and is disposed on the other axial end of the end surface portion 14b via a predetermined axial clearance. The damper rubber 23 is fitted to the upper part. The vibration ring 24 is disposed on the inner peripheral side of the outer peripheral cylindrical portion 14c of the pulley 14 via a predetermined radial gap, and is disposed on the other axial end of the end face portion 14b via a predetermined axial gap. A mass increasing portion 24a having a diameter larger than that of the pulley 14 is integrally formed at the other end portion in the axial direction.

  The flange portion 31d of the hub 31 and the coupling portion 11 are separated from each other in the axial direction and are not in contact with each other. Further, the coupling part 11 and the damper part 21 are also separated from each other and are not in contact with each other, but in order to prevent contact due to swinging or the like during operation (at the time of shaft rotation), the coupling part 11 and the damper part 21 are not in contact with each other. Specifically, a bearing is interposed. Specifically, a radial bearing 32 is interposed between the inner peripheral cylindrical portion 14 a of the pulley 14 in the coupling portion 11 and the cylindrical portion 22 b of the flange member 22 in the damper portion 21. Yes.

  The jig assembly structure 41 provided in the flange portion 31d of the hub 31 is formed by the required number of screw holes 42 as described above. The screw hole 42 is formed so as to penetrate the flange portion 31d in the thickness direction, that is, is formed in parallel to the central axis of the damper 1. Further, the screw holes 42 are formed in a plurality on the circumference, for example, two equally spaced. Since the screw hole 42 is formed by pressing from one axial direction of the flange portion 31d, a cylindrical edge (edge) portion 43 having a shape protruding in the other axial direction is formed, whereby the screw hole 42 is formed. Is formed larger than the thickness of the flange portion 31d. In the screw hole 42, a screw-shaped removal jig is screwed into the screw hole 42 to temporarily connect the hub 31 and the jig, and in this connected state, the hub 31 is pulled strongly to remove the entire damper 1 from the rotating shaft. It is pulled out in one axial direction, and the removal work of the damper 1 is thereby facilitated.

  The air flow feeding structure 44 provided on the flange portion 31d of the hub 31 has a rising portion formed by cutting out a part of the flange portion 31d on the plane in the shape of a tongue piece and raising it to the front side in the thickness direction as described above. The (starting piece) is a fin 45 and the rising mark is a through-hole-shaped ventilation hole 46, and there are a plurality of such three-dimensional air flow feeding structures 44 on the circumference, for example, 6 etc. Is formed. When the fin 45 rotates, air (outside air) is sent to the vent hole 46, and an air flow blown from the vent hole 46 to the engine side B is blown to the front side A end surface of the coupling rubber 13. Therefore, it is possible to suppress the occurrence of a heat storage phenomenon due to the operation of the coupling rubber 13 and to improve its durability. The direction of rotation of the fin 45 is indicated by an arrow X in FIG.

Stopper structure provided in the flange portion 31d of the hub 31 47, the flange outside by setting larger than the inner diameter d ₂ of the pulley 14 of the coupling portion 11 the outer diameter d ₁ of the flange portion 31d as described above The peripheral portion is used as a stopper 48. By providing such a stopper structure 47, for example, even when the coupling rubber 13 breaks and the pulley 14 jumps out to the front side A, As a result, it is possible to prevent the peripheral device and the vehicle body from being damaged by the pop-up of the pulley 14 by suppressing the pop-out.

  The torque fluctuation absorbing damper 1 having the above configuration is an embodiment of the present invention, and the configuration of the present invention is not limited to the above embodiment. For example, a thrust bearing may be interposed between the coupling portion 11 and the damper portion 21 in addition to the radial bearing 32. In the example of FIG. 3, the end surface portion 14b of the pulley 14 and the damper portion in the coupling portion 11 are provided. A thrust bearing 33 is interposed between the vibration ring 24 and the vibration ring 24. The damper portion 21 may be a vulcanization adhesion type dynamic damper that vulcanizes and bonds the damper rubber 23 between the flange member 22 and the vibration ring 24, and the pulley 14 may be a mono pulley type.

DESCRIPTION OF SYMBOLS 1 Torque fluctuation absorption damper 11 Coupling part 12 Sleeve 13 Coupling rubber 14 Pulley 14a Inner peripheral cylinder part 14b, 22a, 31b End surface part 14c Outer peripheral cylinder part 14d Pulley groove 21 Damper part 22 Flange member 22b, 31c Cylindrical part 23 Damper rubber 24 Vibrating ring 24a Mass increasing portion 31 Hub 31a Small diameter cylindrical portion 31d Flange portion 32, 33 Bearing 41 Jig assembly structure 42 Screw hole 43 Edge portion 44 Air flow feeding structure 45 Fin 46 Ventilation hole 47 Stopper structure 48 Stopper A Front side B Engine side

Claims (5)

A coupling portion that reduces vibration transmission due to torque fluctuations of the rotating shaft; a damper portion that reduces vibration due to torsional resonance; and a hub that fits and holds the coupling portion and the damper portion. A torque fluctuation absorbing damper that is detachable from the shaft,
The hub integrally has a flange portion radially outward at one end portion in the axial direction of the cylindrical portion that fits the coupling portion,
The torque variation absorbing damper, wherein the flange portion has a jig assembly structure for assembling a removal jig when the damper is removed from the rotating shaft. The torque fluctuation absorbing damper according to claim 1,
2. The torque fluctuation absorbing damper according to claim 1, wherein the jig assembly structure includes a required number of screw holes provided in the flange portion. The torque fluctuation absorbing damper according to claim 1 or 2,
The flange portion has an air flow feeding structure in which a part of the flat surface is cut out in a tongue shape and raised in the thickness direction so that the rising portion serves as a fin and the rising mark serves as a vent hole. ,
The air flow feeding structure suppresses the temperature rise of the cup link rubber by blowing an air flow toward the coupling rubber of the coupling portion fitted to the cylindrical portion during rotation. A featured torque fluctuation absorbing damper. The torque fluctuation absorbing damper according to claim 1, 2, or 3,
The flange portion has a stopper structure in which the outer peripheral edge of the flange is set as a stopper by setting the outer diameter of the flange larger than the inner diameter of the pulley of the coupling portion.
The torque fluctuation absorbing damper, wherein the stopper structure suppresses the pulley from falling off the damper. The torque fluctuation absorbing damper according to claim 1, 2, 3 or 4,
A torque fluctuation absorbing damper, wherein the hub is formed of a sheet metal press product.

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