JP2001082584A - Pulley unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid useless structure in a pulley unit. SOLUTION: A one-way clutch 3 is arranged inside a circular space between two circular bodies 1, 2 concentrically arranged and opposed to each other, while sliding bearings 4, 4 are arranged on both ends of the one-way clutch 3 in an axial direction. In such a pulley unit A, a conventionally known circular retainer of the one-way clutch 3 is replaced with a plurality of circumferentially separated separators 13. The separators 13 are positioned by two sliding bearings 4, 4. It is thus possible to reduce excessive elements composing a retainer part, and weight thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pulley unit having a one-way clutch. This pulley unit is, for example, a crank pulley of an engine of an automobile or the like,
It is used as a pulley for auxiliary equipment mounted on automobiles (compressors for air conditioners, water pumps, alternators, cooling fans, etc.).

[0002]

2. Description of the Related Art FIG. 6 shows a pulley unit used for a conventional crank pulley. In the figure, 81 is a shaft body,
82 is a pulley, 83 is a one-way clutch, 84 and 84 are sliding bearings, and 85 and 86 are seals.

In this pulley unit, a rotating shaft such as a crankshaft is attached to a shaft 81, and a pulley 82
A one-way clutch 83 absorbs fluctuations in the rotation of the crankshaft to suppress uneven rotation of the pulley 82. Also, the shaft 81
, Damper masses 87 and 88 for attenuating torsional vibration and bending vibration of the crankshaft are attached.

The one-way clutch 8 is
3 and the slide bearings 84, 84 are externally fitted and fixed by press-fitting, and then the pulley 82 is positioned with respect to the one-way clutch 83 and the slide bearings 84, 84. To position the pulley 82, the one-way clutch 83 and the slide bearings 84, 84 are provided with a flange 82a provided radially inward on the inner peripheral surface of the pulley 82, and a pulley 8a.
This is carried out by being sandwiched in the axial direction by a lid 89 screwed to the open end of the second.

[0005]

By the way, the inventor of the present application has conducted intensive studies from various viewpoints in order to eliminate the waste in the configuration of the pulley unit, and has found that the sliding bearing 84 and the retainer of the one-way clutch 83 are not required. I came to think that it could be combined.

[0006] However, the sliding bearing 84 differs depending on the required load-bearing ability, but the sliding guide surface cannot be simply made narrower. There is room for improvement here.

[0007] In view of such circumstances, an object of the present invention is to eliminate waste in the configuration of a pulley unit.

[0008]

According to a first aspect of the present invention, there is provided a pulley unit in which a one-way clutch is provided in an opposed annular space between two inner and outer annular members arranged concentrically. A sliding bearing that bears a radial load acting between the two ring bodies is disposed on both axial sides of the directional clutch. The one-way clutch includes an inner ring having cam surfaces at several places around the circumference, and an inner ring having: One outer ring is provided concentrically with the outer ring via an annular space, and one wedge-shaped space is formed between the outer ring and each cam surface of the inner ring so as to be capable of rolling in the circumferential direction. A plurality of rollers, a plurality of elastic members that individually press each roller toward the narrow side of the wedge-shaped space, and each of the above-mentioned respective members in a state in which they are individually brought into contact with a region extending over a cam surface adjacent in the circumferential direction of the inner ring. Hold the elastic members individually and A plurality of separators that regulate the circumferential rolling range of each roller, wherein the two slide bearings are externally fitted and fixed to the inner ring body by press fitting and slidably contact the inner peripheral surface of the outer ring. A ring-shaped convex portion is formed on the outer diameter side of the separator so as to sandwich the axial end of the separator from the radial direction with the inner race of the one-way clutch.

According to a second aspect of the present invention, there is provided a pulley unit in which the outer ring body of the first aspect and the outer ring of the one-way clutch are integrally formed.

In short, according to the present invention, the one-way clutch has a structure in which a conventionally known annular retainer is circumferentially separated into a plurality of separators, and the separators are positioned by two slide bearings. Therefore, the thickness of the retainer element can be reduced, and the weight can be reduced. In addition, since the slide bearing is provided with a ring-shaped projection that enters the inside of the one-way clutch, the slide guide surface of the slide bearing can be used even if the fitting portion of the slide bearing with the inner ring is made as narrow as possible. It can be as wide as possible.

According to the second aspect of the present invention, since the outer ring body and the outer ring of the one-way clutch are integrally formed, the structure can be further simplified and the radial dimension can be reduced. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

FIG. 1 to FIG. 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a pulley unit, and FIG.
FIG. 3 is a sectional view taken along line (2)-(2) of FIG. 1, FIG. 3 is a perspective view of the one-way clutch, FIG. 4 is a plan view of a part of the one-way clutch, and FIG. It is a perspective view which shows the separator of a directional clutch and a plain bearing separately.

The pulley unit A in the figure is used as a crank pulley of an automobile engine, and includes a hub 1 as an inner ring, a pulley 2 as an outer ring,
It has a one-way clutch 3 and slide bearings 4 and 4.

Although not shown, the hub 1 is directly or indirectly fixed to a crankshaft of an automobile engine. The hub 1 is provided with damper masses 5 and 6 for attenuating torsional and bending vibrations of the crankshaft.

The pulley 2 is provided concentrically with respect to the hub 1, and a belt B for transmitting the rotational power of the crankshaft to the auxiliary equipment of the automobile engine is wound around the outer periphery thereof. A wavy groove is formed.

The one-way clutch 3 is interposed at the center in the axial direction of the opposed annular space between the hub 1 and the pulley 2, and includes an inner ring 10, a plurality of rollers 11, a plurality of elliptical coil springs 12, and A plurality of separators 13 are provided, and the pulley 2 is used as an outer ring.

The sliding bearings 4 and 4 are provided one by one on both sides in the axial direction of the one-way clutch 3 in the annular space opposed to the hub 1 and the pulley 2, and are fitted and fixed to the hub 1 by press fitting. The inner peripheral surface of the pulley 2 is guided by sliding. These slide bearings 4 and 4 are formed of a general slide bearing material (for example, a synthetic resin material having lubricity, a copper-based metal material, etc.) and an iron-based metal material such as carbon steel for machine structure. May be.

This embodiment is characterized in that the one-way clutch 3 has a structure in which an annular retainer generally known in the related art is divided into a plurality of separators 13, and will be described below.

The inner race 10 is externally fitted to the hub 1 by press-fitting. The inner race 10 has a flat surface for forming a wedge-shaped space between the inner race 10 and the inner circumferential surface of the pulley 2 at several places on the outer circumferential surface. A key-like cam surface 10a is provided.

The rollers 11 are disposed one by one in a wedge-shaped space formed between the cam surface 10a of the inner race 10 and the inner peripheral surface of the pulley 2 so as to be capable of rolling in the circumferential direction.

The coil springs 12 individually press the rollers 11 toward the narrow side (lock side) of the wedge-shaped space.

The separator 13 restricts the rolling range of the roller 11 in the circumferential direction and holds the coil spring 12. The separator 13 is provided on the outer periphery of the inner ring 10 at an angular portion between the cam surfaces 10 a circumferentially adjacent to each other. It is arranged in the applied state and is positioned and restrained in the axial direction and the radial direction by the two slide bearings 4 and 4. The separator 13 is made of a synthetic resin material having a substantially rectangular shape in a plan view, and its outer surface is formed in a partial arc shape having a required radius of curvature.
The inner surface is shaped so as to abut on the angular portion between the adjacent cam surfaces 10a of the inner race 10. This separator 1
3, a coil spring 12 is provided on one end surface which is narrow in plan view.
Are provided on the outer side shoulders of the two wide side surfaces in plan view.
13b is provided. In addition, on the outer surface of the protrusion 13a, a minute protrusion 13c for preventing the coil spring 12 from coming off is provided.

The sliding bearings 4 and 4 are provided with an annular plate portion 4.
A ring-shaped protrusions 4b, 4b swelling in one direction in the axial direction are provided in the outer diameter region on one side of the surfaces a, 4a, and the upper half section is formed in an approximately inverted L-shape. The annular plates 4a, 4a are in contact with the axially outer end surfaces of the inner race 10 and the separator 13 so as to regulate the axial displacement of the separator 13. The annular protrusions 4b, 4b are provided with stepped portions 13b,
By being locked to 13b, the inner ring 10 sandwiches the separator 13 in the radial direction. This annular convex portion 4b,
The end face of 4b is slidably contacted with the end face of each roller 11 so as to prevent the skew of each roller 11.

A flange 2a extending inward in the radial direction is integrally provided at one axial end of the inner peripheral surface of the pulley 2, and an opening at the other axial end of the inner peripheral surface of the pulley 2 is provided. A lid 7 is fixed to the end by press-fitting.

The one-way clutch 3 and the slide bearings 4 fixed to the hub 1 are clamped in the axial direction by the flange 2a of the pulley 2 and the lid 7, so that the pulley 2 is held. It is positioned in the axial direction with respect to the hub 1.

The inner diameter of the flange 2a and the inner circumference of the lid 7 are provided with enlarged diameter steps 2b and 7a, and seals 8 and 8 are provided on the enlarged diameter steps 2b and 7a. It is fitted and mounted. The seals 8, 8 generally have a well-known configuration mounted on a rolling bearing, and are formed by covering an annular core with an elastic body such as rubber, and as a part of the elastic body, the outer periphery of the hub 1. The lip is slidably contacted with the surface.

Next, the operation of the pulley unit A configured as described above will be described.

The pulley unit A here can absorb rotation fluctuations of a crankshaft connected to the hub 1. Normally, the rotation speed of the crankshaft of the automobile engine fluctuates with the torque fluctuation, and the one-way clutch 3 is switched between the locked state and the free state in accordance with the rotation fluctuation, so that the pulley 2 is synchronized with the hub 1. Rotational fluctuation of the pulley 2 is suppressed by causing rotation or rotation of the pulley 2 by its own inertia.

In short, the crankshaft and the hub 1
When the rotational speed of the one-way clutch 3 is relatively higher than that of the pulley 2, the rollers 11 of the one-way clutch 3 are rolled to the narrow side of the wedge-shaped space and locked, so that the hub 1 and the pulley 2 are integrated. Rotate synchronously. However, when the rotation speed of the hub 1 becomes relatively slower than that of the pulley 2, the rollers 11 of the one-way clutch 3 are rolled to the wide side of the wedge-shaped space to be in a free state. Is interrupted, so that the pulley 2 rotates only by the rotational inertia force. By such an operation, rotation fluctuation of the pulley 2 can be suppressed.

The pulley unit A described above has a structure in which the roller 11 and the coil spring 12 of the one-way clutch 3 are divided into a plurality of separators 13 without using an annular retainer as in the conventional example. Therefore, the thickness of the retainer element can be reduced, and the weight can be reduced. Since the upper and lower sliding bearings 4 and 4 have an almost L-shape, the pulley pulleys 4 and 4 can be pulled down even if the fitting portions of the sliding bearings 4 and 4 with respect to the hub 1 are narrowed to reduce the axial dimension. 2 can be made as wide as possible, and as a result, a sufficient load bearing capacity can be secured.

In addition, in the above embodiment, the cover 7 is fixed to the open end of the pulley 2 by caulking, so that a screw hole for screwing the cover as in the conventional example is provided. 2, the thickness of the pulley 2 can be reduced, the radial dimension of the entire pulley unit A can be reduced, and the weight can be reduced. Further, in the above embodiment, the pulley 2
Since the seal 8 is mounted on the inner periphery of the flange 2a, the axial dimension can be reduced as compared with the case where the seal is provided outside the flange as in the conventional example.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable. (1) The one-way clutch 3 in the above embodiment has an outer ring integrated with the pulley 2, but may have an outer ring separate from the pulley 2. In the above embodiment, the coil spring 13 of the one-way clutch 3 can be replaced by various leaf springs, elastic pieces, or the like. (2) In the above embodiment, an example is described in which the flange 2a is provided integrally with the pulley 2, but without providing the flange 2a,
The present invention also includes a pulley 2 provided with a circumferential groove to which a retaining ring such as a so-called circlip is attached. (3) Although not shown, the seal 8 in the above-described embodiment may be a conventionally known seal having various configurations.

[0034]

According to the first and second aspects of the present invention, the retainer element in the one-way clutch is devised.
Since the weight can be reduced and the cage element is positioned on the slide bearing, the fitting portion of the slide bearing to the inner ring is made as narrow as possible to reduce the occupied space. Nevertheless, the sliding guide surface of the sliding bearing can be made as wide as possible to ensure a sufficient load bearing capacity. As described above, it is possible to reduce the structural waste while maintaining the performance of the entire pulley unit.

According to the second aspect of the present invention, since the outer ring body and the outer ring of the one-way clutch are integrally formed, the structure can be further simplified and the radial dimension can be reduced. Become.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pulley unit according to an embodiment of the present invention.

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

FIG. 3 is a perspective view of a one-way clutch.

FIG. 4 is a developed plan view of a part of the one-way clutch.

FIG. 5 is a perspective view showing a separator and a slide bearing of the one-way clutch separately.

FIG. 6 is a longitudinal sectional view of a conventional pulley unit.

[Explanation of symbols]

 Reference Signs List A pulley unit 1 hub 2 pulley 2a pulley flange 3 one-way clutch 10 one-way clutch inner ring 11 one-way clutch roller 12 one-way clutch coil spring 13 one-way clutch separator 4 sliding bearing 4a sliding bearing annular plate 4b Ring-shaped convex part of plain bearing

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Fujiwara 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Co., Ltd. (72) Inventor Shuji Nagano 5-33-8 Shiba 5-chome, Minato-ku, Tokyo Mitsubishi Motors Inside the Industrial Co., Ltd. (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 Industrial Co., Ltd. In-company (72) Inventor Toshihiro Takeshima 1-10-1 Kyobashi, Chuo-ku, Tokyo F-term in Bridgestone Corporation (reference) 3J031 AC06 BA19 CA02

Claims (2)

[Claims] A one-way clutch is provided in an opposed annular space between two inner and outer rings arranged concentrically, and a one-way clutch is provided between the two rings on both axial sides of the one-way clutch. A pulley unit provided with a sliding bearing that bears a radial load, wherein the one-way clutch is provided with an inner ring having cam surfaces at several places around the circumference, and the outer ring is provided concentrically with the inner ring via an annular space. An outer ring, a plurality of rollers arranged one by one in a wedge-shaped space formed between the outer ring and each cam surface of the inner ring so as to be capable of rolling in the circumferential direction, and A plurality of elastic members that individually press on the narrow side, and each of the elastic members is individually held in a state in which the elastic members are individually brought into contact with a region that straddles the cam surface adjacent in the circumferential direction of the inner ring, and Multiple components that regulate the circumferential rolling range The two slide bearings are fitted externally to the inner ring body by press-fitting and slide-guide the inner peripheral surface of the outer race, and the outer diameter side of the one-way clutch has A pulley unit, wherein a ring-shaped convex portion that sandwiches an axial end of the separator from a radial direction is formed between the inner ring and the inner ring. 2. The pulley unit according to claim 1, wherein said outer ring body and an outer ring of said one-way clutch are formed integrally.