JP2001108068A - Damper pulley - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To make it possible to arrange accessories near the engine block, to shorten the brackets of the accessories, to reduce the weight, and to achieve sufficient strength. I do. SOLUTION: A pulley hub 1 fixed to a crankshaft 2 of an engine, an inertia body 33 provided on the pulley hub 1 via a rubber 32, and an outer ring disposed around the pulley hub 1 and around which a belt 4 is wound. 5 and this outer ring 5
And a one-way clutch 6 interposed between the pulley hub 1 and the outer ring 5 and the inertia body 33 in this order from the engine side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper pulley mounted on a crankshaft of an engine of an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, damper pulleys attached to a crankshaft are provided with, for example, to reduce phenomena such as torsion and bending resonance of the crankshaft.
JP-A-59-40060 and JP-A-2-80252.
As shown in the publication, a rubber damper (having an inertial body provided on a pulley hub via rubber) is provided. In the rubber damper, phenomena such as torsion of the crankshaft and bending resonance occur in a region where the rotational speed of the crankshaft is particularly high (for example, 2000 rpm or more), so that the most excellent damping effect is exhibited in this rotational region. Designing characteristics.

Incidentally, it is generally known that the crankshaft of an automobile engine has a lead / lag due to a torque fluctuation at the time of output generation, and the rotation speed fluctuates. In addition, the rotation fluctuation of the crankshaft becomes large particularly in a low rotation speed region such as an idling rotation region. Such a fluctuation in the rotation of the crankshaft directly leads to a fluctuation in the rotation of the damper pulley. Therefore, the belt slips, for example, causing a fluctuation in the tension of the belt wound around the damper pulley. Further, if the characteristics of the rubber damper are designed to attenuate the rotation fluctuation of the crankshaft, particularly in the idling rotation range, by the rubber damper described above, not only the effect of reducing the resonance phenomenon, which is the original purpose of the rubber damper, is reduced, but also the rubber damper is reduced. There is a problem that the durability of the device itself is reduced. Therefore, a device has been developed which aims to suppress the fluctuation of the rotation of the pulley and prevent the belt from slipping. That is, as described in Japanese Patent Application Laid-Open No. H10-115363, a pulley hub as a driving member fixed to a crankshaft, an outer ring as a driven member disposed around the pulley hub and around which a belt is wound, A one-way clutch having a one-way clutch interposed between a pulley hub and an outer ring, and a cam surface for forming a wedge-shaped space of the one-way clutch is provided on the inner diameter side. In this prior art, a rubber damper is disposed on the engine side.

[0004]

If a rubber damper is provided on the engine side and an outer ring is provided on the side farther from the engine as in the prior art, it becomes difficult to dispose the auxiliary equipment near the engine block, and the auxiliary equipment is mounted on the engine. When installed far from the block, the strength and weight of the brackets of the auxiliary equipment had to be increased.

In view of the above, the present invention provides a damper pulley in which accessories can be arranged near an engine block, and the brackets are short and lightweight because of the proximity to the engine, and the strength is sufficient. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pulley hub fixed to a crankshaft of an engine, an inertial body provided on the pulley hub via rubber, and an outer periphery of the pulley hub. In a damper pulley having an outer ring provided and a belt wound around the belt and a one-way clutch interposed between the outer ring and the pulley hub, the outer ring and an inertia body are arranged in this order from the engine side.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

The pulley hub 1 is adapted to mount the crankshaft 2 of the engine in the mounting hole 11 thereof.
A cylindrical portion 13 extending in a direction away from the engine is formed from an outer peripheral edge of a disk-shaped main body portion 12 extending in a direction perpendicular to the axis where the mounting hole 11 is formed. A plate 31 is provided on an outer peripheral surface of the cylindrical portion 13 of the pulley hub 1 on a side remote from the engine.
The inertia body 33 is attached via the rubber damper 3 and the rubber damper 3. An outer ring 5 around which a belt 4 is wound, and a one-way clutch 6 interposed between the outer ring 5 and the pulley hub 1 are provided on the side of the cylindrical portion 13 of the pulley hub 1 close to the engine alongside the rubber damper 3. ing.

FIG. 2 shows a cross section taken along the line II-II of FIG. 1. The one-way clutch 6 includes a plurality of rollers 61 and a plurality of rollers 6.
A retainer 62 having a pocket 621 for storing
The holder 62 includes a coil spring 63 as an elastic member that is housed in a concave portion 622 connected to the pocket 621 and presses the roller 61 toward one inner wall surface of the pocket 621. A cam surface 64 formed of a flat key-shaped notch along the axial direction is provided at several places on the outer peripheral surface of the cylindrical portion 13 of the pulley hub 1 near the engine side.
4, the outer diameter of the cylindrical portion 13 is polygonal. That is, a plurality of wedge-shaped spaces are formed between the outer peripheral surface of the cylindrical portion 13 and the inner peripheral surface of the outer ring 5, and each of the wedge-shaped spaces has a roller 61 of the one-way clutch 6. Are arranged one by one. In addition, the coil spring 63
In the wedge-shaped space, it is arranged at a position deviated to the drive member side, that is, to the inner diameter side, and is in contact with the axial center position of the roller 61. This makes it possible to apply the resilient biasing force of the coil spring 63 to the roller 61 in a well-balanced and efficient manner in a manner that assists the rotation of the roller 61. Therefore, regardless of where the roller 61 is located in the wedge-shaped space, the roller 61 Can keep his posture straight. Therefore, the slip of the roller 61 can be prevented, and it is possible to contribute to the stabilization of the locking and free operations by the roller 61. Note that a through hole 7 is formed on the outer peripheral side of the mounting hole 11.

In another embodiment shown in FIG. 3, an inertial body 33 is provided on the inner peripheral surface of the cylindrical portion 13 via a plate 31 and rubber 32.
This is an example in which the rubber damper 3 is configured by attaching the rubber damper.
Also in this embodiment, the outer ring 5 is close to the engine side,
Reference numeral 3 is arranged at a position farther from the engine side than the outer ring 5. In addition, a portion of the plate 31 extending outwardly of the outer diameter of the cylindrical portion 13 is inclined such that the distal end side is away from the engine side, and as a result, the rubber 32 gradually increases in thickness toward the outer peripheral direction of the pulley hub 1. .

In the embodiment shown in FIG. 4, the outer diameter of the cylindrical portion 13 is fitted via a rubber plate 321 and a plate 311 which is fitted on the inner peripheral surface of the cylindrical portion 13 of the pulley hub 1 and extends from the distal end side of the cylindrical portion 13 in the radial direction. An inertia body 331 is provided on the side, and a timing mark 332 is provided on an outer peripheral surface of the inertia body 331. The inertial body 331 is of a disk type, and the disk-type inertial body 331 is composed of a plate 311 and an outer ring 5.
And will be arranged between them.

In the embodiment shown in FIG. 5, in addition to the rubber damper 3 shown in FIG. 4, an inertia body 33 is provided on the inner surface of the main body 12 of the pulley hub 1 through a rubber 32, and this is bent by a bending damper 3A.
Is shown. Outside the portion of the plate 311 extending in the direction perpendicular to the axis, a prevention plate 8 is provided to prevent the bending damper 3A from jumping out when it is damaged. The prevention plate 8 has a hole 8A. When the inertial body 33 for the bending damper 3A is provided in the inner peripheral surface of the pulley hub 1, the tip of the inertial body 33 is formed in a tapered shape 33A. The hole 8A of the prevention plate 8 is for partially fixing the crankshaft 2 so as not to rotate when the rubber damper 3 is detached. The reason why the tapered shape 33A is formed in the inertia body 33 of the bending damper 3A is to easily finish the protrusion of the rubber 32 after vulcanization molding. In addition, such a bending damper 3
When A is provided, the positioning of the metal fitting in the circumferential direction at the time of vulcanization of the rubber 32 can be easily achieved by using the through hole 7. Furthermore, the through hole 7 can be used for measuring the lock torque of the one-way clutch 6.

FIG. 6 shows an embodiment in which a rubber damper 3 provided inside as shown in FIG. 4 is used instead of the bending damper 3A in the embodiment shown in FIG.

The embodiment shown in FIG. 7 shows an example in which the plates 31 and 311 shown in FIG. 6 are shared.

[0015]

As described above, according to the present invention, by providing the outer ring closer to the engine side and the inertia body farther from the engine side on the pulley hub, the auxiliary equipment can be located near the engine block. It becomes possible to arrange, and the intensity | strength of the bracket of auxiliary equipment can be improved. When the strength of the bracket is equal to that of the conventional bracket, the weight can be reduced as much as the auxiliary devices can be arranged near the engine block. Further, when the rubber damper is a disk type, the width can be reduced. Also, in the disk type in which the inertia body is provided and the plate is pressed into the inner peripheral surface of the pulley hub, the force of preventing the plate from coming off can be improved while reducing the width dimension. In the case where the rubber for attaching the inertial body to the pulley hub gradually increases in thickness in the outer circumferential direction of the pulley hub, by increasing the rubber thickness on the outer circumferential side where distortion increases with respect to input in the torsion direction, the outer circumference is increased. Side distortion can be reduced. In the case where the timing mark is provided on the outer periphery of the inertial body, the timing cannot be obtained by the one-way clutch. Therefore, the timing can be easily adjusted by using the inertial body. Further, in each of the embodiments, since the structure in which the damper portion and the one-way clutch portion are arranged in parallel, both functions can be exhibited without impairing the performance as a single product. That is, if the damper unit and the one-way clutch unit are arranged in series, the function of the one-way clutch receiving the influence of the damper and accurately locking and freeing is impaired.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view showing another embodiment.

FIG. 4 is a sectional view showing still another embodiment.

FIG. 5 is a sectional view showing still another embodiment.

FIG. 6 is a sectional view showing another embodiment.

7 is a sectional view showing an embodiment in which two rubber damper plates of the embodiment in FIG. 6 are shared.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulley hub 2 Crankshaft 3 Rubber damper 31 Plate 32 Rubber 33 Inertial body 4 Belt 5 Outer ring 6 One-way clutch

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F16F 15/126 F16F 15/12 S (72) Inventor Shuji Nagano 5-33-8 Shiba 5-chome, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Shigeo Kadoya 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Toshikazu Kanai 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Inside Industrial Co., Ltd. (72) Inventor Toshihiro Takeshima 1-10-1 Kyobashi, Chuo-ku, Tokyo Inside Bridgestone Corporation (72) Inventor Hideki Fujiwara 3-5-8 Minamisenba, Chuo-ku, Osaka City, Osaka Koyo Seiko Co., Ltd. F term in the company (reference) 3J031 AA10 AC10 BA03 CA01

Claims (12)

[Claims] 1. A pulley hub fixed to a crankshaft of an engine, an inertia member provided on the pulley hub via rubber, an outer ring disposed around the pulley hub and around which a belt is wound, and an outer ring and a pulley hub A damper pulley having a one-way clutch interposed between the outer ring and an inertia body in order from the engine side. 2. The damper pulley according to claim 1, wherein the shape of the inertia body is a disk type. 3. A disk-type inertial body provided with a plate fixed to a pulley hub and rubber interposed therebetween,
3. The damper pulley according to claim 2, wherein the inertial body is disposed between the plate and the outer ring. 4. The rubber for attaching the inertial body to the pulley hub,
4. The thickness of the pulley hub gradually increases in the outer circumferential direction.
The damper pulley described in 1. 5. The damper pulley according to claim 1, wherein a plate for attaching the inertial body to the pulley hub is press-fitted to an inner peripheral surface of the pulley hub. 6. The pulley hub according to claim 1, wherein a torsional vibration member provided with an inertial body is press-fitted into the inner peripheral surface of the pulley hub via an inner peripheral ring and rubber provided on the inner peripheral surface of the pulley hub. 2. The damper pulley according to claim 1. 7. The damper pulley according to claim 6, wherein the inertial body according to claim 6 is provided on an inner surface of a plate on which the disk type inertial body is attached to the pulley hub. 8. The damper pulley according to claim 1, wherein an inertial body for a bending damper is provided on an inner peripheral surface of the pulley hub. 9. The damper pulley according to claim 8, wherein the tip of the inertia body for the bending damper has a tapered shape. 10. The damper pulley according to claim 1, wherein a through hole is provided in a fastening portion of the pulley hub. 11. A plate provided on an outer surface of a disk-type inertial body, the plate having a hole into which a jig for fixing a crankshaft so as not to rotate when the inertial body is attached / detached is provided. Claim 1
11. The damper pulley according to any one of claims 10 to 10. 12. The damper pulley according to claim 1, wherein a timing mark is provided on an outer peripheral surface of the disk type inertial body.