JP2001082582A - Pullley 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 fitted to the inner circular body 1. In such a state, an outer end surface of the inner circular body 1 is caulked for preventing escaping of the sliding bearings 4, 4 which are in sliding contact with the outer circular body 2. It is thus possible to dispense with conventional flange parts and closing lids, and thereby to simplify a structure and reduce axial measurement.

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 performed by sandwiching the cover 89 in the axial direction with the closed lid 89.

However, in order to allow relative rotation between the pulley 82 and the shaft body 81, a total is obtained by adding the axial size of the two slide bearings 84, 84 to the axial size of the inner ring 83a of the one-way clutch 83 described above. Of the pulley 82
It is necessary to secure a required axial clearance and allow the axial displacement of the pulley 82 by making it smaller than the axial dimension from the inner surface of the flange portion 82a to the opening on the lid 89 side.

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.

[0009]

In the above conventional example, the one-way clutch 83 and the slide bearings 84, 84 are connected to the pulley 8
Although the second flange 82a and the lid 89 are sandwiched in the axial direction, it is pointed out that the number of used parts is increased wastefully and the axial dimension is increased wastefully. You.

In addition, in the above-mentioned conventional example, the lid 89 is fixed to the pulley 82 by screwing.
In such a case, it is pointed out that the threaded hole must be formed in the pulley 82, so that the thickness in the radial direction and the weight needlessly increase, such as the need to increase the wall thickness. .

If the number of parts is large as described above, it becomes difficult to properly manage the axial clearance, that is, the allowable axial displacement of the pulley 82, and therefore, the pulley 8
2 has an adverse effect that the backlash increases or the rotational torque of the pulley 82 increases. The reason will be described. The axial gap described above is a total axial dimension obtained by adding the axial dimension of the two slide bearings 84, 84 to the axial dimension of the inner ring 83a of the one-way clutch 83, and the inner face of the flange portion 82a of the pulley 82 is closed. 8
Although it is a deviation from the axial dimension up to the opening on the ninth side, the inner ring 83a of the one-way clutch 83, the two slide bearings 84 and 84, Since there are dimensional tolerances in all of the axial dimensions up to the opening, the axial gaps vary large and small due to the combination of these many dimensional tolerances. By the way, in order to suppress the variation, it is necessary to combine the components in consideration of the dimensional tolerances of the above-described parts, and thus it is necessary to perform an extremely troublesome operation.

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.

[0013]

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. In the opposed annular space, sliding bearings are disposed on both sides in the axial direction of the one-way clutch, and the sliding bearing is fitted to one of the two rings in a state of being fitted to one of the two rings. The outer end face is secured by caulking and is in sliding contact with the other annular body.

According to a second aspect of the present invention, there is provided a pulley unit, wherein seals which are respectively slidably contacted with the other annular body are provided on the axially outer shoulders of the sliding contact surfaces of the two slide bearings. Installed.

According to a third aspect of the present invention, in the pulley unit according to the first or second aspect, an annular bulging portion bulging radially inward is provided in a region where the one-way clutch is provided in the outer ring body. It is provided as an outer ring of the one-way clutch.

In short, according to the present invention, the slide bearings on both sides of the one-way clutch are fixed to the inner ring or the outer ring by caulking to prevent them from coming off, thereby eliminating the flange portion and the lid as in the conventional example. are doing. As a result, the number of components can be reduced, and the axial dimension can be reduced.
In addition, since the lid used in the conventional example can be eliminated, there is no need to screw the lid, so that the thickness of the outer ring body can be reduced, and the radial dimension can be reduced. Become.

In particular, according to the second aspect of the present invention, since the seal is provided between the slide bearing and the other annular body which is in sliding contact with the slide bearing, the seal is provided adjacent to the slide bearing as in the conventional example. The axial dimension can be further shortened as compared with the case of installation.

[0018]

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

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 illustrated pulley unit A 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 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. An annular bulging portion 2a bulging radially inward is provided in the center region in the axial direction on the inner periphery of the pulley 2. Due to the presence of the annular bulging portion 2a, a diameter-enlarging step 2b is provided on both sides thereof. , 2b are provided.

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, an annular retainer 11, a plurality of rollers 12, an elliptical coil spring. 13 and is configured to utilize the annular bulging portion 2a of the pulley 2 as an outer ring. The inner ring 10 is fitted to the hub 1 by press-fitting, and forms a wedge-shaped space between the inner peripheral surface of the annular bulging portion 2a of the pulley 2 at eight circumferential positions on the outer peripheral surface thereof. A flat key-shaped cam surface 10a is provided for the operation. The retainer 11
A slit 10b provided on the inner ring 10 and a protrusion 11c provided on the retainer 11 are provided on the outer periphery of the inner ring 10.
Thus, the outer casing is positioned in the circumferential and axial directions. 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 rollers 12 are stored in the pockets 11a of the retainer 11 one by one with the circumferential rolling range restricted. The coil spring 13 is mounted on a protrusion 11b projecting from the inner wall surface of each pocket 11a of the retainer 11, and presses the roller 12 toward a narrow side (lock side) of the wedge-shaped space.

The two slide bearings 4 and 4 are respectively disposed on both sides in the axial direction of the one-way clutch 3 in the annular space between the hub 1 and the pulley 2. The pulley 2 is configured to be in sliding contact with the inner peripheral surfaces of the enlarged diameter steps 2b. These plain bearings 4, 4
Is a ring bearing made of a general plain bearing material, for example, a synthetic resin material or a copper-based metal material having lubricity.

This embodiment has a feature in the structure for positioning and fixing the two slide bearings 4 and 4 with respect to the hub 1 and will be described below.

The one-way clutch 3 on the outer peripheral surface of the hub 1
The two slide bearings 4 and 4 are brought into contact with both end surfaces of the inner ring 10 in a tight fit, and the outer end surfaces at both ends in the axial direction of the hub 1 are stamped and crimped. The uneven thickness portions 1a, 1a generated by caulking are pressed against the outer end surfaces of the two slide bearings 4, 4, respectively.
The two slide bearings 4 and 4 are fixed to the hub 1 so as not to come off.

Thus, the one-way clutch 3 can be held in the axial direction by the two slide bearings 4 and 4 fixed to the hub 1. And these two plain bearings 4,
The inner surface of the outer diameter side of the pulley 2 is opposed to both end surfaces of the annular bulging portion 2a of the pulley 2 via a required axial gap. Is positioned. The axial gap described above is necessary to allow relative rotation between the hub 1 and the pulley 2, and the axial dimension of the annular bulging portion 2 a is smaller than the axial dimension of the inner ring 10 of the one-way clutch 3. It is secured by setting.

In addition to the above, the enlarged diameter stepped portions 2a, 2a of the pulley 2
Seals 7, 7 are attached to the outer shoulder of the
The seals 7 are in sliding contact with small-diameter step portions 4a provided on the outer shoulders of the outer peripheral surfaces of the slide bearings 4,4. The seals 7, 7 generally have a well-known configuration mounted on a rolling bearing. An elastic body such as rubber is attached to an annular core, and the sliding bearings 4, 4 are used as a part of the elastic body. 4 is provided with a lip that is slidably contacted.

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 slide bearings 4 and 4 are fixed to the hub 1 by caulking, and the flange and the cover as in the conventional example are eliminated, so that the configuration is simplified. And the axial dimension can be shortened. In addition, since the lid used in the conventional example can be eliminated, the lid does not need to be screwed to the pulley 2, so that the thickness of the pulley 2 can be reduced, and the radial dimension can be reduced. Become.

In the above-described embodiment, the diameter-increased steps 2a, 2a of the pulley 2 where the slide bearings 4, 4 are slidably contacted.
Since the seals 7 and 7 are attached to the bearing, the axial dimension can be further reduced as compared with the case where the seal is provided adjacent to the slide bearing as in the conventional example.

Thus, a small and lightweight pulley unit A can be provided at low cost.

Further, in the above embodiment, the pulley 2 is positioned in the axial direction by sandwiching the annular bulging portion 2a of the pulley 2 between the two slide bearings 4, 4, so that the pulley 2 It is easy to properly manage the allowable directional displacement, and it is possible to reduce the rattling of the pulley 2 while reducing the rotational torque of the pulley 2. That is, in the case of this embodiment, the deviation between the axial dimension of the annular bulging portion 2a in the pulley 2 and the axial dimension of the inner ring 10 in the one-way clutch 3 becomes the axial displacement of the pulley 2, that is, the axial gap. . Therefore, if the dimensional tolerance between the annular bulging portion 2a of the pulley 2 and the inner ring 10 of the one-way clutch 3 is managed, the axial gap, that is, the axial displacement of the pulley 2 can be suppressed as small as possible. As described above, the allowable displacement in the axial direction of the pulley 2 can be properly managed with a much simpler operation than 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) In the above embodiment, the sliding bearings 4 and 4 are connected to the hub 1
And the sliding contact with the inner peripheral surface of the pulley 2, but the opposite, that is, the sliding bearings 4 and 4 are fixed to the pulley 2 and the outer periphery of the hub 1 is fixed. The present invention includes a configuration in which the surface is brought into sliding contact with the surface. (2) Although the seal 7 in the above embodiment is not shown, conventionally known seals having various configurations can be used. (3) The one-way clutch 3 in the above embodiment has a form in which the outer ring is integrated with the pulley 2, but may have a form in which the pulley 2 is provided with a separate outer ring. 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. (4) In the above-described 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, but 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.

[0036]

According to the first to third aspects of the present invention, the flange and the cover as in the conventional example are devised so that the structure can be simplified and the axial dimension can be shortened. . In addition, since the lid used in the conventional example can be eliminated, there is no need to screw the lid to the outer ring, so the thickness of the outer ring can be reduced and the radial dimension can be reduced. Become like

In particular, according to the second aspect of the present invention, a seal is provided between the slide bearing and the ring body which is in sliding contact with the slide bearing. Therefore, as in the conventional example, the seal is provided adjacent to the slide bearing. Can be further shortened in the axial direction as compared with the case in which is installed.

As described above, according to the present invention, a small and lightweight pulley unit can be provided at low cost.

[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 1a Uneven thickness portion of hub 2 Pulley 3 One-way clutch 4 Slide bearing 7 Seal

Continued on the front page (72) Inventor Hideki Fujiwara 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Shuji Nagano 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Shigeo Kadoya 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Toshikazu Kanai 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation ( 72) Inventor Toshihiro Takeshima 1-10-1 Kyobashi, Chuo-ku, Tokyo F-term in Bridgestone Corporation (reference) 3J031 AC06 BA03 BA08 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. The sliding bearing is prevented from coming off by caulking the outer end surface of the one ring in a state fitted to one of the two rings, and the other ring is A pulley unit configured to be in sliding contact with a body. 2. The pulley unit according to claim 1, wherein one of the two sliding bearings and the other ring body, which is a sliding contact therewith, are provided with a seal that is slidably contacted with the other sliding bearing. A pulley unit. 3. The pulley unit according to claim 1, wherein an annular swelling portion swelling radially inward is provided in a region of the outer ring body where the one-way clutch is provided. A pulley unit provided as an outer ring of the pulley.