JP2001082583A - Pulley unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce size and weight of a pulley unit having a one-way clutch. SOLUTION: The one-way clutch 3 and two sliding bearings 4, 4 are arranged inside a circular space between two circular bodies 1, 2 concentrically arranged and opposed to each other. The sliding bearings 4, 4 are axially sandwiched by an escape preventive element 2a arranged on axial one end of an inner peripheral surface of the outer circular body 2, and a closing lid 7 internally fitted to the axially other end of the inner peripheral surface of the outer circular body 2 and caulkingly fixed to the outer circular body 2. Since the closing lid 7 is fixed to the outer circular body 2 by not screwing but caulking, the outer circular body 2 can be thinned.

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 A conventional pulley unit has a structure in which a rolling bearing is disposed on at least one side of a one-way clutch or a sliding bearing in order to bear a radial load acting between two inner and outer rings. The structure is arranged.

FIG. 4 shows a pulley unit having a slide bearing. 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. The shaft 81
, Damper masses 87 and 88 for attenuating torsional vibration and bending vibration of the crankshaft are attached.

[0004] Although not shown, this pulley unit is generally attached to a shaft 81 such that a rotating shaft such as a crankshaft is attached to the shaft 81 and a belt is wound around the pulley 82. , The pulley 82 needs to be positioned.

Therefore, conventionally, the one-way clutch 83 and the slide bearings 84, 84 are externally fitted and fixed to the shaft body 81 by press-fitting, and then the pulley 82 is attached to the one-way clutch 83 and the slide bearings 84, 84. Is positioned.

To position the pulley 82, a one-way clutch 83 and slide bearings 84, 84 are screwed to a flange portion 82a provided radially inward on an inner peripheral surface of the pulley 82 and an open end of the pulley 82. This is carried out by being held in the axial direction by the closed lid 89.

The first seal 85 is located outside the flange 82a of the pulley 82, and the second seal 86 is located
It is attached to the inner periphery of the lid 89.

[0008]

In a mode in which the lid 89 is screwed to the pulley 82 as in the above-mentioned conventional pulley unit, a screw hole must be formed in the pulley 82, and therefore, the wall thickness is increased. Must be thickened, resulting in unnecessary increases in radial dimensions and weight,
There is room for improvement here.

In view of such circumstances, an object of the present invention is to reduce the size and weight of a pulley unit having a one-way clutch.

[0010]

According to a first aspect of the present invention, there is provided a pulley unit, wherein a one-way clutch is provided in an opposed annular space between two inner and outer annular members arranged concentrically. Sliding bearings are provided on both sides in the axial direction of the one-way clutch in the opposed annular space, and the sliding bearings are fitted to the other of the two annular members in sliding contact with one of the two annular members. The one-way clutch and the two slide bearings are fitted on one end in the axial direction of the inner peripheral surface of the outer ring, and are fitted inside the other end in the axial direction of the inner peripheral surface of the outer ring; and It is sandwiched in the axial direction by a lid fixed by caulking to the outer ring.

According to a second aspect of the present invention, in the pulley unit, the retaining element of the first aspect includes a radially inward flange formed integrally with the outer ring body. A seal that is slid on the outer peripheral surface of the inner ring body is attached to the periphery.

According to a third aspect of the present invention, there is provided a pulley unit, wherein a seal which is slidably contacted with an outer peripheral surface of the inner ring body is attached to an inner periphery of the lid according to the first or second aspect.

In short, in the present invention, the lid is fixed to the open end of the outer ring body by caulking.
This eliminates the necessity of forming a screw hole for screwing the lid on the outer ring as in the conventional example, so that the thickness of the outer ring can be reduced.

In particular, according to the second aspect of the present invention, since the seal is mounted on the inner periphery of the flange of the outer ring body, compared with the case where the seal is installed outside the flange as in the conventional example. Thus, the axial dimension can be shortened.

[0015]

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

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a pulley unit, and FIG.
1 is a sectional view taken along the line (2)-(2) of FIG. 1, and FIG. 3 is a developed plan view showing a part of the one-way clutch.

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 two slide bearings 4, 4.

Although not shown, the hub 1 is fixed directly or indirectly 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 an axial center of an annular space between the hub 1 and the pulley 2, and includes an inner ring 10, an annular retainer 11, a plurality of rollers 12, an elliptical coil spring. 13, the pulley 2 is used as an outer ring. The inner ring 10 is fitted over the hub 1 by press-fitting, and a flat key for forming a wedge-shaped space between the inner ring 10 and the inner circumferential surface of the pulley 2 at eight circumferential positions on the outer circumferential surface. A cam surface 10a is provided. The retainer 11 is externally arranged in the circumferential direction and the axial direction by a slit 10b provided in the inner ring 10 and a convex portion 11c provided in the retainer 11 with respect to the outer periphery of the inner ring 10. ing. Pockets 11a penetrating inward and outward in the radial direction are provided in several places on the circumference of the retainer 11, that is, in a region corresponding to the cam surface 10a of the inner ring 10. The roller 12 is provided in each pocket 11 of the cage 11.
a is stored in a state in which the circumferential rolling range is regulated one by one. The coil spring 13 is provided in each of the pockets 11 of the retainer 11.
The roller 12 is mounted on a projection 11b protruding from the inner wall surface of a and presses the roller 12 toward the narrow side (lock side) of the wedge-shaped space.

The two slide bearings 4 and 4 are disposed 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 to the hub 1 by press fitting. It is configured to be fixed and slidably contact the inner peripheral surface of the pulley 2. The plain bearings 4 and 4 are made of a general plain bearing material, for example, a synthetic resin material having lubricating properties or a copper-based metal material in a ring shape.

In this embodiment, the one-way clutch 3 and the two slide bearings 4 fixed to the hub 1
The structure for positioning and fixing the pulley 2 is characteristic, and will be described below.

A flange 2a extending inward in the radial direction is integrally provided at one end in the axial direction on the inner peripheral surface of the pulley 2, and is formed on the inner peripheral surface of the pulley 2 at the opening end at the other end in the axial direction. Has a lid 7 fixed by caulking. The one-way clutch 3 and the two sliding bearings 4 fixed to the hub 1 are held in the axial direction by the flange 2a and the lid 7.

The above-mentioned cover 7 is formed of an annular plate, and is fixedly secured to the pulley 2 by stamping the outer end face of the pulley 2 in a state of being fitted into the pulley 2.

In addition, on the inner periphery of the flange 2a and the inner periphery of the lid 7, there are provided 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, in the pulley unit A, the hub 1
Can absorb rotation fluctuations of the crankshaft connected to the crankshaft. 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
The rotation fluctuation of the pulley 2 is suppressed by rotating synchronously with the rotation of the pulley 2 or rotating by the rotational inertia of the pulley 2 itself.

In short, the crankshaft and the hub 1
When the rotation speed of the one-way clutch 3 is relatively higher than that of the pulley 2, the rollers 12 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 12 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.

In the pulley unit A described above, 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 prior art is formed. 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. Moreover, in the above embodiment, since the seal 8 is mounted on the inner periphery of the flange 2a of the pulley 2, the axial dimension is smaller than that in the case where the seal is installed outside the flange as in the conventional example. Can be shortened. Thus, a compact and lightweight pulley unit A can be provided.

It should be noted that the present invention is not limited to the above-described embodiment, and various applications and modifications are conceivable. (1) In the above embodiment, the sliding bearings 4 and 4 are connected to the hub 1
The outer peripheral surface of the pulley 2 is slid against the inner peripheral surface of the pulley 2. It can be fixed by being press-fitted and fitted, and brought into sliding contact with the outer peripheral surface of the hub 1. (2) Although the seal 8 in the above embodiment is not shown, various conventionally known seals can be used. (3) In the above embodiment, an example in which the pulley 2 is integrally provided with the flange 2a is described. However, 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. (4) Although the one-way clutch 3 in the above embodiment has an outer ring integrated with the pulley 2, the one-way clutch 3 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. (5) In the above embodiment, an example is described in which the cam surface 10a of the one-way clutch 3 is formed on the inner ring 10 side. However, the present invention can be applied to the one provided on the outer ring side. However, in the case of the above-described embodiment, it is possible to prevent the rollers from unnecessarily coming off the lock position due to the centrifugal force even in the high-speed rotation range.
Suitable for high speed rotation.

[0030]

According to the first to third aspects of the present invention, the cover to be attached to the open end of the outer ring body is fixed by caulking, so that the screw hole for screwing the cover as in the conventional example is provided. Is not required to be formed on the outer ring body, the thickness of the outer ring body can be reduced, the radial dimension of the entire pulley unit can be reduced, and the weight can be reduced.

In particular, according to the second aspect of the present invention, since the seal is mounted on the inner periphery of the flange of the outer ring body, compared with the case where the seal is installed outside the flange as in the conventional example. Thus, the axial dimension can be shortened.

As described above, according to the present invention, a compact and lightweight pulley unit can be provided.

[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 developed plan view showing a part of the one-way clutch.

FIG. 4 is a longitudinal sectional view of a conventional pulley unit.

[Explanation of symbols]

 A pulley unit 1 hub 2 pulley 2a pulley flange 3 one-way clutch 4 sliding bearing 7 lid 8 seal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Fujiwara 3-5-8 Minamisenba, Chuo-ku, Osaka City Inside 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 AC01 BA19 CA02

Claims (3)

[Claims] 1. A one-way clutch is disposed in opposed annular spaces of two inner and outer annular members arranged concentrically, and slide bearings are provided on both sides of the one-way clutch in the opposed annular space in the axial direction. Is disposed, and the sliding bearing is fitted to the other of the two rings so as to be in sliding contact with one of the rings, and the one-way clutch and the two sliding bearings are formed of an outer ring. A stopper element provided at one axial end of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of the outer ring, and a lid closed by being swaged to the outer annular body at the other axial end of the inner peripheral surface of the outer annular body. A pulley unit sandwiched in the axial direction. 2. The pulley unit according to claim 1, wherein the retaining element comprises a radially inward flange formed integrally with the outer ring body, and an inner periphery of the inner ring of the flange. A pulley unit having a seal attached to the outer peripheral surface of the body for sliding contact. 3. The pulley unit according to claim 1, wherein a seal which is slidably contacted with an outer peripheral surface of the inner ring is attached to an inner periphery of the lid. Pulley unit.