JP2011252556A - Rotational fluctuation absorbing damper pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the axial length of a damper pulley, facilitate manufacturing, and absorb vibration in an axial direction of the pulley.SOLUTION: A rotational fluctuation absorbing damper pulley which consists of a hub 11 having an outer hub portion 11B connected to an outer peripheral side of a connecting hub portion 11C and an inner hub portion 11A connected to an inner peripheral side, a pulley 13 having an outer pulley portion 21 connected to an outer peripheral side of a connecting pulley portion 22 and an inner pulley portion 23 connected to an inner peripheral side, a ring-like annular inertial mass 12 arranged on an outer peripheral side of the outer hub portion 11B, and an elastically deformable second rubber-like elastic member 15 having an inner peripheral side connected to an outer periphery of the inner hub portion 11A and an outer peripheral side connected to an inner periphery of the inner pulley portion 23. The rotational fluctuation absorbing damper pulley forces a disc-like supporting portion 24 to be connected to an inner peripheral surface of the inner pulley portion 23 and keeps second rubber-like elastic bodies 15 at equal intervals at the front and rear parts in an axial direction of the pulley 13 sandwiching the supporting portion 24 therebetween. The second rubber-like elastic bodies 15 are connected to the inner peripheral surface of the inner pulley portion 23 and to the front and rear surfaces of the supporting portion 24.

Description

  The present invention relates to a rotation fluctuation absorbing damper pulley that absorbs rotation fluctuation transmitted from a crankshaft of an engine such as an automobile and transmits the rotation to an auxiliary machine or the like.

  A part of the driving force from the engine of an automobile is transmitted to an auxiliary machine such as an alternator or a water pump through an endless belt from a pulley attached to the shaft end of the crankshaft. Some pulleys are provided with a rotational fluctuation absorbing damper for absorbing rotational fluctuations.

  As this type of pulley with a rotational fluctuation absorbing damper, for example, a damper pulley 100 described in Patent Document 1 and shown in FIG. 3 is known. The damper pulley 100 is connected to the outer periphery of a hub 101 that is attached to the shaft end of the crankshaft and rotates integrally with the inertia mass 103 via a first rubber-like elastic body 102, and the hub 101 and the pulley 104. Are connected via a second rubber-like elastic body 105. Then, the rotational vibration input from the crankshaft to the hub 101 is attenuated by the first rubber-like elastic body 102, and the rotational fluctuation torque input from the crankshaft to the hub 101 is reduced by the second rubber-like elastic body 105. The rotation is transmitted to the pulley 104 while absorbing by the rotational shearing action. A radial bearing 106 is inserted between the hub 101 and the pulley 104 so that the pulley 104 is radially supported by the hub 101.

Further, as a pulley with a rotational fluctuation absorbing damper, for example, a damper pulley 110 described in Patent Document 2 and shown in FIG. 4 is known. The damper pulley 110 is connected to the outer periphery of a hub 111 that is attached to the shaft end of the crankshaft and rotates integrally with the inertia mass 113 via a first rubber-like elastic body 112, and the hub 111 and the pulley 114. Are connected via a second rubber-like elastic body 115. Then, the rotational vibration input from the crankshaft to the hub 111 is attenuated by the first rubber-like elastic body 112, and the rotational fluctuation torque input from the crankshaft to the hub 111 is reduced by the second rubber-like elastic body 115. The rotation is transmitted to the pulley 114 while absorbing by the rotational shearing action. A radial bearing 116 is inserted between the inertia mass 113 and the pulley 114 so that the pulley 114 is supported radially with respect to the hub 111.

Utility model registration No. 2606562 JP 2006-322573 A

Since the second rubber-like elastic body 105 is arranged in the radial direction between the pulley 104 and the ring 107 in the rotational fluctuation absorbing damper pulley described in Patent Document 1, the axial length can be shortened. Further, since the second rubber-like elastic body 105 is vulcanized and bonded to the pulley 104 and the ring 107 and then the ring 107 is press-fitted into the hub 100, the pulley 104 and the hub 100 can be integrated, so that the manufacturing is easy. . On the other hand, the vibration of the pulley 104 in the axial direction cannot be suppressed.

In the rotation fluctuation absorbing damper pulley described in Patent Document 2 described above, the second rubber-like elastic body 115 is arranged in the axial direction between the hub 110 and the ring 117, and the pulley is arranged in the middle of the second rubber-like elastic body 115 in the axial direction. Since 114 is inserted, the vibration of the pulley 114 in the axial direction can be suppressed. On the other hand, since the second rubber-like elastic body 115 is arranged in the axial direction, the axial length of the damper pulley 110 becomes long. The axially front portion 115a of the second rubber-like elastic body 115 is vulcanized and bonded to the pulley 114 and the ring 117, and the axially rear portion 115b of the second rubber-like elastic body 115 is vulcanized and bonded to the pulley 114. After the ring 117 is press-fitted into the hub 111, the axially rear portion 115b of the second rubber-like elastic body 115 is adhered to the hub 111 using an adhesive, and thus vulcanized adhesion and adhesion are performed. Since it is divided into two steps of bonding with an agent, it takes time.

The invention according to claim 1 for solving the above-described problem is that a cylindrical outer hub portion is connected to the outer peripheral side of the disk-shaped connecting hub portion, and a cylindrical inner hub portion is connected to the inner peripheral side. A hub, a pulley in which a cylindrical outer pulley portion is connected to the outer peripheral side of the disc-shaped connecting pulley portion, and a cylindrical inner pulley portion is connected to the inner peripheral side, and arranged on the outer peripheral side of the outer hub portion A ring-shaped inertial mass; an elastically deformable second rubber-like elastic member having an inner peripheral side connected to the outer periphery of the inner hub portion and an outer peripheral side connected to the inner periphery of the inner pulley portion; a hub and an inertial mass; In a rotational fluctuation absorbing damper pulley comprising a first rubber-like elastic member that can be elastically deformed, and a radial bearing that radially supports the pulley with respect to the hub and allows rotation, a radius is provided on the inner peripheral surface of the inner pulley portion. A disk-shaped support that extends inward The second rubber-like elastic bodies are evenly arranged on the front and rear in the axial direction of the pulley across the support portion, and the second rubber-like elastic body is arranged between the inner peripheral surface of the inner pulley portion and the front and rear of the support portion. It is connected to the surface.

According to this structure, since the 2nd rubber-like elastic body is arrange | positioned at radial direction, the axial direction length of a damper pulley can be shortened. Further, since the second rubber-like elastic bodies are evenly arranged on the front and rear sides of the pulley with the support portion interposed therebetween, vibration in the axial direction of the pulley can be suppressed.

According to a second aspect of the present invention, in the rotational fluctuation absorbing damper pulley according to the first aspect, a cylindrical ring is connected to the inner peripheral side of the second rubber-like elastic member, and this ring is connected to the outer periphery of the inner hub portion. It is characterized by being press-fitted and fixed to.

According to this structure, manufacture of a damper pulley becomes easy.

According to a third aspect of the present invention, in the rotational fluctuation absorbing damper pulley according to the second aspect, the second rubber-like elastic member is connected to the outer peripheral surface of the ring and the inner peripheral surface of the inner pulley portion by vulcanization adhesion. It is characterized by this.

According to this structure, manufacture of a damper pulley becomes easier.

According to the present invention, the length of the damper pulley in the axial direction can be shortened and the manufacture is facilitated. Vibration in the axial direction of the pulley can be suppressed.

It is sectional drawing of the rotation fluctuation absorption damper pulley which shows embodiment of this invention. It is sectional drawing of the rotation fluctuation absorption damper pulley which shows other embodiment of this invention. It is sectional drawing of the conventional rotational fluctuation absorption damper pulley which has arrange | positioned the 2nd rubber-like elastic body to radial direction. It is sectional drawing of the conventional rotational fluctuation absorption damper pulley which has arrange | positioned the 2nd rubber-like elastic body to the axial direction.

An embodiment of the present invention will be described with reference to FIG. The damper pulley 10 is mounted on a crankshaft (not shown) of an automobile engine, for example, and is used with a V-belt suspended around the outer periphery, and the rotational power of the crankshaft by the engine is mounted on the automobile via the V-belt. It is transmitted to various auxiliary machines, for example, an alternator, a water pump, a cooler compressor, etc., and functions to drive these auxiliary machines.

The damper pulley 10 includes a hub 11, an inertia mass 12 and a pulley 13 that are arranged concentrically with the hub 11 on the outer peripheral side of the hub 11, and a first rubber-like material interposed between the hub 11 and the inertia mass 12. An elastic body 14, a second rubber-like elastic body 15 interposed between the hub 11 and the pulley 13, and a radial bearing 20 interposed between the pulley 13 and the inertia mass 12 are configured.

The hub 11 connects the cylindrical inner hub portion 11A, the cylindrical outer hub portion 11B concentrically positioned on the outer peripheral side of the inner hub portion 11A, and the inner hub portion 11A and the outer hub portion 11B. The connecting hub 11C extends in the radial direction. A cylindrical ring 17 is press-fitted and fixed to the outer periphery of the inner hub portion 11A. Although not shown, the shaft end of the crankshaft is fitted and fixed to the inner periphery of the inner hub portion 11A, and the hub 11 is rotated integrally with the crankshaft.

The outer diameter of the outer hub portion 11B is smaller than the inner diameter of the inertia mass 12, and a ring-shaped first rubber-like elastic body 14 is formed between the outer peripheral surface of the outer hub portion 11B and the inner peripheral surface of the inertia mass 12. Is press-fitted with a tightening margin. Thereby, the hub 11 and the inertia mass 12 are elastically connected via the first rubber-like elastic body 14. The first rubber-like elastic body 14 is formed of a rubber-like elastic material having excellent heat resistance and mechanical strength. The inertial mass 12 vibrates with respect to the hub 11 via the first rubber-like elastic body 14, so that vibration transmitted from the crankshaft to the hub 11 is attenuated. The outer peripheral surface of the outer hub portion 11B and the inner peripheral surface of the inertial mass 12 are formed with concavities and convexities corresponding to each other in the circumferential direction, and are compressed between the outer hub portion 11B and the inertial mass 12. In this state, the first rubber-like elastic body 14 that is press-fitted has a shape that undulates radially outward in the middle of the axial direction, and makes it difficult for the inertia mass 12 to move in the axial direction relative to the outer hub portion 11B. .

The pulley 13 includes a substantially cylindrical outer pulley portion 21 disposed on the outer peripheral side of the inertia mass 12, a connecting pulley portion 22 extending radially inward from an end portion on the axial rear surface side of the outer pulley portion 21, and A cylindrical inner pulley portion 23 that is bent toward the front side in the axial direction of the pulley 13 on the inner peripheral side of the connecting pulley portion 22 is provided. On the outer peripheral surface of the outer pulley portion 21, a poly V groove 21 </ b> A in which a V-belt (not shown) is suspended is formed. A disc-shaped support portion 24 is integrally connected to the inner peripheral surface of the inner pulley portion 23 so as to extend radially inward at an axial intermediate position of the inner pulley portion 23. The second rubber-like elastic body 15 is evenly arranged on the front and rear in the axial direction of the pulley 13 with the support portion 24 interposed therebetween, and the outer peripheral surface of the second rubber-like elastic body 15 supports the inner peripheral surface of the inner pulley portion 23. The front surface 24A of the portion 24, the rear surface 24B of the support portion 24, and the inner peripheral surface 24C of the support portion 24 are vulcanized and bonded. The inner peripheral surface of the second rubber-like elastic body 15 is vulcanized and bonded to the outer peripheral surface of the ring 17. A ring-shaped second rubber-like elastic body 15 is continuously provided in the circumferential direction so as to be disposed between the inner peripheral surface of the inner pulley portion 23 and the outer peripheral surface of the ring 17. Since the second rubber-like elastic body 15 is evenly arranged before and after the pulley 13 in the axial direction across the support portion 24, the axial thickness of the pulley 13 of the second rubber-like elastic body 15 is determined by the support. The front and rear sides of the pulley 13 in the axial direction of the pulley 13 with the portion 24 interposed therebetween are the same, and the function of centering when the pulley 13 vibrates in the axial direction is enhanced.

A support portion 24 is formed so as to protrude radially inward in the middle of the inner pulley portion 23 of the pulley 13 in the axial direction. The inner pulley portion 23 and the support portion 24 are integrally formed by a press slitting method or the like.

Thus, when the support portion 24 of the pulley 13 is sandwiched between the second rubber-like elastic body 15 from the front and rear in the axial direction of the damper pulley 10, the vibration is attenuated when the pulley 13 tries to vibrate in the axial direction. Work as a force. That is, when the pulley 13 vibrates in the axial direction, a force for shearing the second rubber-like elastic body 15 from the inner peripheral surface 24C of the support portion 24 toward the front and rear in the axial direction works. Attenuates axial vibration. Thereby, the vibration of the pulley 13 in the axial direction can be suppressed without providing a thrust bearing for positioning the pulley 13 in the axial direction. The second rubber-like elastic body 15 is made of a rubber-like elastic material having excellent heat resistance and mechanical strength, and the hub 11 and the pulley 13 are elastically connected through the second rubber-like elastic body 15. Thus, the rotational fluctuation of the driving torque input from the crankshaft to the hub 11 is absorbed by the second rubber-like elastic body 15, and the rotation is smoothly transmitted from the hub 11 to the pulley 13.

A radial bearing 20 is interposed between the inner circumference of the outer pulley portion 21 of the pulley 13 and the outer circumference of the inertia mass 12, and the pulley 13 is concentric with the center of rotation of the crankshaft attached to the hub 11 by the radial bearing 20. And is radially supported by the inertial mass 12 so as to be relatively rotatable. A sliding bearing is used as the radial bearing 20.

An engagement hole 25 having a long groove in the rotational direction is formed in the connecting pulley portion 22 of the pulley 13, and an engagement pin 26 protruding from the end face of the inertia mass 12 in the engagement hole 25 is provided in the circumferential direction. It is loosely fitted on both sides with appropriate clearance. Thus, a stopper mechanism 27 is configured to limit the relative rotation angle of the pulley 13 with respect to the hub 11 in the circumferential direction to a predetermined range. The stopper mechanism 27 prevents the second rubber-like elastic body 15 from being excessively twisted and broken.

The rotation fluctuation absorbing damper pulley 10 in the above-described embodiment is rotated together with the crankshaft by attaching the inner hub portion 11A of the hub 11 to the shaft end of the crankshaft (not shown) of the engine. The rotation of the crankshaft is transmitted from the hub 11 to the pulley 13 via the second rubber-like elastic body 15, and further to an auxiliary machine such as an alternator via a V-belt (not shown) wound around the pulley 13. Communicated.

Since the engine converts the reciprocating motion of the piston into the rotational motion of the crankshaft, the crankshaft undergoes a periodic rotational fluctuation with the rotation, and this rotational fluctuation is caused by the second rubber-like elastic body 15. Is absorbed by. Therefore, the rotational fluctuation transmitted to the pulley 13 is reduced, and the rotation is smoothly transmitted from the pulley 13 to the accessories. Since the inertia mass 12 is supported so as to be able to vibrate in the rotational direction with respect to the hub 11 via the first rubber-like elastic body 14, the rotational vibration of the inertia mass 12 transmitted from the crankshaft to the hub 11 is prevented. Work to counteract.

The inertia mass 12 and the hub 11 are processed into a predetermined shape by casting and cutting. The pulley 13 is processed into a predetermined shape by bending, plastic processing, and cutting. The second rubber-like elastic body 15 is vulcanized by setting a pulley 13 and a ring 17 in a mold, injecting a rubber material into the mold, and applying pressure and heat. If a primer is applied to the pulley 13 and the ring 17 in advance, the second rubber-like elastic body 15 is vulcanized and bonded to the place where the primer is applied. In this case, a primer is applied in advance to the outer peripheral surface of the ring 17, the inner peripheral surface of the inner pulley portion 23, the front and rear surfaces of the support portion 24, and the inner peripheral surface of the support portion 24, and the second rubber-like elasticity is applied to these surfaces. The body 15 is vulcanized and bonded. As a material for the second rubber-like elastic body 15, EPDM rubber was used.

The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

FIG. 2 shows a damper pulley according to another embodiment, and the same components are used except for the pulley, so the same reference numerals are given and the description thereof is omitted. The pulley 50 includes a cylindrical outer pulley portion 51, a disk-like connecting pulley portion 52, and a cylindrical inner pulley portion 53, which are made of a single iron plate. A disk-shaped support portion 54 is fixed by welding so as to extend inward. In this case, there is an advantage that the outer peripheral side of the support portion 54 can be welded to the inner pulley 53 equally before and after the pulley 50 in the axial direction. The second rubber-like elastic body 15 is vulcanized and bonded to the inner peripheral surface of the inner pulley portion 53, the front surface 54A of the support portion 54, the rear surface 54B of the support portion 54, and the inner peripheral surface 54C of the support portion 53.

As another embodiment, the second rubber-like elastic body 15 is vulcanized using a mold, and the second rubber-like elastic body 15 is fixed to the pulley 13 and the ring 17 via an adhesive. Also good.

Furthermore, as another example, the second rubber-like elastic body 15 may be directly fixed to the hub 11 via an adhesive without using the ring 17.

10: damper pulley, 11: hub, 11A: inner hub portion, 11B: outer hub portion, 11C: connecting hub portion, 12: inertia mass, 13: pulley, 14: first rubber-like elastic body, 15: second Rubber elastic body, 17: ring, 20: radial bearing, 21: outer pulley, 22: coupling pulley, 23: inner pulley, 24: support, 50: pulley, 51: outer pulley, 52: coupling Pulley part, 53: Inner pulley part, 54: Support part

Claims (3)

A hub in which a cylindrical outer hub portion is connected to the outer peripheral side of the disk-shaped connecting hub portion, and a cylindrical inner hub portion is connected to the inner peripheral side;
A pulley in which a cylindrical outer pulley portion is connected to the outer peripheral side of the disk-like connecting pulley portion and a cylindrical inner pulley portion is connected to the inner peripheral side;
A ring-shaped inertial mass disposed on the outer peripheral side of the cylindrical outer hub part;
An elastically deformable second rubber-like elastic member having an inner peripheral side connected to the outer periphery of the cylindrical inner hub portion and an outer peripheral side connected to the inner periphery of the cylindrical inner pulley portion;
An elastically deformable first rubber-like elastic member connecting the hub and the inertial mass;
In the rotational fluctuation absorbing damper pulley consisting of a radial bearing that radially supports the pulley with respect to the hub and allows rotation,
A disk-like support portion is connected to the inner peripheral surface of the inner pulley portion so as to extend radially inward, and the second rubber-like elastic body is evenly arranged before and after the pulley in the axial direction across the support portion. A rotation fluctuation absorbing damper pulley characterized by connecting the second rubber-like elastic body to the inner peripheral surface of the cylindrical inner pulley portion and the front and rear surfaces of the support portion. In the rotation fluctuation absorbing damper pulley according to claim 1,
A rotation fluctuation absorbing damper pulley characterized in that a cylindrical ring is connected to the inner peripheral side of the second rubber-like elastic member, and this ring is press-fitted and fixed to the outer periphery of the inner hub portion. In the rotation fluctuation absorbing damper pulley according to claim 2,
The second rubber-like elastic member is connected to the outer peripheral surface of the ring and the inner peripheral surface of the inner pulley portion by vulcanization adhesion.

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