JPH10213207A - Roller clutch incorporating type pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wear on the components of support bearings and a roller clutch to improve the durability. SOLUTION: Floating washers 18, 18 are provided between inner ring side collar parts 10, 10 provided at inner rings 8, 8 for support bearings and outer ring side collar parts 12a, 12b provided at an outer ring 11. By this constitution, the inner ring side collar parts 10, 10 and the outer ring side collar parts 12a, 12b are prevented from being rubbed against each other to be worn down. Further, seal rings 19, 19 are provided between the inner peripheral surfaces of both end parts of the outer ring 11 and the outer peripheral surfaces of the inner rings 8, 8 for the support bearings. By this constitution, a foreign matter is prevented from entering into the inside of the support bearings 4, 4 and a roller clutch 5 to prevent wear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A pulley with a built-in roller clutch according to the present invention is, for example, a drive pulley fixed to an end of a rotating shaft of an alternator, which is a kind of auxiliary equipment for various engines, and fixed to an end of a crankshaft of the engine. It is used to drive the alternator by wrapping a belt between it and.

[0002]

2. Description of the Related Art An engine accessory such as an alternator is driven by, for example, a belt partially extending over a drive pulley fixed to an end of a crankshaft of a drive engine of an automobile. That is, an endless belt is stretched between the driven pulley fixed to the end of the rotating shaft of the engine accessory and the drive pulley, and the engine accessory is rotatably driven in synchronization with the drive engine. .

Conventionally, as the driven pulley, a pulley simply fixed to the rotary shaft has conventionally been used. On the other hand, in recent years, when the running speed of the belt is constant or increasing, the power can be freely transmitted from the belt to the rotating shaft, and when the running speed of the belt is decreasing, the pulley and the rotating shaft are rotated. Various types of pulleys with a built-in roller clutch that can freely rotate relative to a shaft have been proposed and used in some. For example, JP-A-7-31807-8, JP-A-8-61443, JP-B-7-72585,
French Patent Publication FR226059A1 and the like describe a pulley with a built-in roller clutch having the above functions.

[0004] The pulleys with a built-in roller clutch described in each of these documents have a sleeve that can be externally fitted and fixed to a rotating shaft. A pulley having a cylindrical inner peripheral surface is arranged around the sleeve concentrically with the sleeve. A pair of support bearings and a roller clutch are provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley. Among these, the support bearing allows the sleeve and the pulley to rotate relative to each other while supporting the radial load applied to the pulley. Also, the roller clutch allows the transmission of the rotational force from the pulley to the sleeve only when the pulley rotates in a predetermined direction with respect to the sleeve.

There are two reasons for using such a pulley with a built-in roller clutch. First, the first reason is to extend the life of the endless belt. For example, if the driving engine is a diesel engine,
During low rotation such as during idling, fluctuations in the rotational angular speed of the crankshaft increase. As a result, the running speed of the endless belt stretched over the driving pulley also fluctuates finely. On the other hand, the rotating shaft of the alternator driven to rotate by the endless belt via the driven pulley does not fluctuate so rapidly due to the inertial mass of the rotating shaft and the rotor fixed to the rotating shaft. Therefore, when the driven pulley is simply fixed to the rotating shaft, the endless belt and the driven pulley tend to rub in both directions due to the fluctuation of the rotational angular velocity of the crankshaft. As a result, stresses in different directions are repeatedly applied to the endless belt that rubs against the driven pulley, so that slipping easily occurs between the endless belt and the driven pulley, or the life of the endless belt is shortened. Or cause

Accordingly, by using the above-mentioned roller clutch built-in type pulley as such a driven pulley, when the running speed of the endless belt is constant or tends to increase, the rotation from the driven pulley to the rotating shaft is performed. When the traveling speed of the endless belt tends to decrease, the relative rotation between the driven pulley and the rotating shaft is made freely. That is, when the running speed of the endless belt tends to decrease, the rotational angular speed of the driven pulley is made slower than the rotational angular speed of the rotating shaft, and the contact portion between the endless belt and the driven pulley rubs strongly. Prevent things. In this way, the direction of the stress acting on the rubbed portion between the driven pulley and the endless belt is kept constant, slippage occurs between the endless belt and the driven pulley, or the life of the endless belt is shortened. To prevent

[0007] The second reason is to improve the power generation efficiency of the alternator. The rotating shaft on which the rotor of the alternator is fixed is rotationally driven by an automobile driving engine via an endless belt and a driven pulley. When a general driven pulley is used, when the rotational speed of the driving engine suddenly decreases, the rotational speed of the rotor also sharply decreases, and the amount of power generated by the alternator also sharply decreases. On the other hand, if the pulley with a built-in roller clutch is used as a driven pulley attached to the alternator, the rotational speed of the rotor gradually increases due to the inertial force even when the rotational speed of the drive engine suddenly decreases. And continues to generate electricity during that time. As a result, as compared with the case where the fixed driven pulley is used, the kinetic energy of the rotating shaft and the rotor can be effectively used to increase the power generation amount of the alternator.

[0008]

In the case of a conventionally known pulley with a built-in roller clutch, a support bearing and a roller are provided between an outer peripheral surface of a sleeve which is externally fixed to a rotating shaft and an inner peripheral surface of the pulley. It is not always sufficient to consider durability, which is required with the incorporation of the clutch. In other words, in the case of a pulley with a built-in roller clutch used for driving an engine accessory such as an alternator incorporated in an engine room or the like, a large amount of dust is present in the surrounding space. It is necessary to prevent dust from entering the inside and to consider wear prevention of each component based on the dust. The pulley with a built-in roller clutch of the present invention was invented in view of such circumstances.

[0009]

The pulley with a built-in roller clutch according to the present invention has a sleeve which can be externally fitted and fixed to a rotating shaft, and a pulley with a built-in roller clutch, like the pulley with a built-in roller clutch. A pulley having a cylindrical inner peripheral surface disposed concentrically with the sleeve and provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and supporting the radial load applied to the pulley while supporting the pulley. A support bearing that allows relative rotation between the
Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley,
A roller clutch is provided which enables the transmission of rotational force between the pulley and the sleeve only when the pulley and the sleeve rotate relative to each other in a predetermined direction.

[0010] In particular, in the roller clutch built-in pulley of the present invention, the roller clutch inner race fixed to the outer peripheral surface of the intermediate portion of the sleeve and the roller clutch inner race on the outer peripheral surface of the sleeve in the axial direction. At least one support bearing inner ring fixed to the detached portion and an outer ring fixed to the inner peripheral surface of the pulley are provided. The roller clutch includes an inner peripheral surface of an intermediate portion of the outer race and an outer peripheral surface of the inner race for the roller clutch, and the support bearing includes axial ends of the inner race for the support bearing and the outer race. It is configured to include a leaning portion. The outer race is formed by pressing a hard metal plate such as a bearing steel.

Further, in the case of the pulley with a built-in roller clutch according to the present invention, an outer ring side flange portion having an inward flange shape is provided at an end portion of the outer ring, and the outer ring side flange portion is provided at an end portion of the support bearing inner ring. An outward flange-shaped inner ring side flange portion is formed at a portion facing the portion. And, between these outer ring side flange and inner ring side flange, a floating washer,
The outer ring-side flange portion and the inner ring-side flange portion are freely mounted for relative rotation.

In the pulley with a built-in roller clutch according to the present invention, the gap between the inner peripheral surface of the axial end of the outer race and the outer peripheral surface of the inner race for the support bearing is formed by a seal ring. I'm blocking.

According to a third aspect of the present invention, in the pulley with a built-in roller clutch, the end of the outer ring has an inward flange shape and an inner peripheral edge is located radially inward of an inner peripheral surface of the inner ring for the support bearing. An outer ring-side flange portion protruding in the direction is formed.
A floating washer is mounted between the outer ring side flange and the axial end face of the sleeve so as to freely rotate relative to the outer ring side flange and the sleeve.

According to a fourth aspect of the present invention, in the pulley with a built-in roller clutch, the end of the inner ring for the support bearing has an outwardly flanged outer peripheral edge diametrically outward from the outer peripheral surface of the outer ring. An inner ring side flange portion protruding from the inner ring is formed.
A floating washer is mounted between the inner ring side flange and the axial end surface of the pulley so as to freely rotate relative to the inner ring side flange and the pulley.

More preferably, both the floating washer and the seal ring are provided at both ends in the axial direction, and a labyrinth seal is provided at a portion where the outer ring side and the inner ring side flanges and the floating washer are provided.

[0016]

In the case of the pulley with a built-in roller clutch according to the present invention having the above-described structure, it is possible to prevent the constituent parts from being worn by dust existing around the pulley, and to secure sufficient durability. That is, the floating washer, which is rotatably mounted on the outer ring side flange portion or the inner ring side flange portion and the mating member so as to be freely rotatable, supports the thrust load acting between the pulley and the sleeve while maintaining the outer ring side flange portion or the inner ring. The surfaces of the side flange and the mating member that face each other are prevented from being worn. In addition, the seal ring that closes the gap between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring for the support bearing prevents foreign substances such as dust from entering the installation portion of the support bearing and the roller clutch,
This contributes to preventing wear of the components of the support bearing and the roller clutch. Further, when a labyrinth seal is provided, the amount of foreign matter reaching the outside of the seal ring is reduced, and the amount of foreign matter that reaches beyond the seal ring and reaches the installation portion of the support bearing and the roller clutch is further reduced. It is possible to further improve the effect of preventing the components of the support bearing and the roller clutch from being worn.

[0017]

1 and 2 show a first embodiment of the present invention corresponding to the first and second aspects of the present invention. The sleeve 1 is entirely formed in a cylindrical shape, is externally fitted and fixed to an end of a rotating shaft (not shown) of an engine accessory such as an alternator, and is rotatable together with the rotating shaft. For this purpose, a female spline portion 2 is formed on the inner peripheral surface of the intermediate portion of the sleeve 1, and the female spline portion 2 and the male spline portion formed on the outer peripheral surface of the end of the rotating shaft are freely engageable. A pulley 3 is arranged around the sleeve 1 concentrically with the sleeve 1. The pulley 3 has a cylindrical inner peripheral surface and a stepped (gear-shaped) outer peripheral surface. still,
The outer peripheral surface may have another shape such as a V-groove. Further, the structure for preventing the relative rotation between the rotary shaft and the sleeve 1 may be replaced with a screw, a fitting between non-cylindrical surfaces, a key engagement, or the like instead of the spline.

A pair of support bearings 4 and 4 and one roller clutch 5 are provided between the outer peripheral surface of the sleeve 1 and the inner peripheral surface of the pulley 3. The support bearings 4 support the radial load applied to the pulley 3 and allow the sleeve 1 and the pulley 3 to rotate relative to each other. The roller clutch 5 is provided with a pulley 3
Only when the is rotated in a predetermined direction with respect to the sleeve 1,
Transmission of rotational force between the pulley 3 and the sleeve 1 is allowed.

In order to constitute such a roller clutch 5,
An inner race 6 for a roller clutch is externally fitted and fixed to the outer peripheral surface of the intermediate portion of the sleeve 1 by interference fit. The inner ring 6 for the roller clutch is formed entirely of a hard metal such as bearing steel into a cylindrical shape, and the outer peripheral surface is a cam surface 7 having irregularities as shown in FIG. To form the support bearings 4, inner rings 8 for support bearings are fixed to the outer peripheral surfaces of both ends of the sleeve 1 by tight fitting. Similarly, each of the support bearing inner rings 8, 8 made of a hard metal such as bearing steel has an L-shaped cross section by forming an outer flange side inner flange portion 10 at one end edge of the cylindrical portion 9 respectively. The whole is formed in a cylindrical shape. The respective inner races 8 for support bearings are externally fitted to the sleeve 1 with the inner ring-side flange portions 10 located on opposite sides, and the leading edges of the respective inner rings 8 are arranged on the shaft of the inner ring 6 for the roller clutch. Butts against both edges. still,
The inner ring 6 for the support bearing may be formed integrally with the sleeve 1 on the outer peripheral surface of the intermediate portion of the sleeve 1.

On the other hand, an outer ring 11 is provided at an intermediate portion of the pulley 3.
Are internally fixed by interference fit. This outer ring 11
Is formed into a cylindrical shape as a whole by pressing a hard metal plate material such as bearing steel or the like, and has an inward flange-shaped outer ring side flange portion 12a at each axial end edge.
12b. In addition, these outer ring side flanges 12
a, 12b, one (left side in FIG. 1) outer ring side flange portion 1
2a has the same thickness dimension as the main body of the outer race 11 because it is formed before being combined with other constituent members. On the other hand, the other outer ring side flange portion 1 (right side in FIG. 1)
2b is thinner because it is formed after being combined with other constituent members.

The roller clutch 5 includes an inner peripheral surface of the intermediate portion of the outer race 11 and an outer peripheral surface of the inner race 6 for the roller clutch. That is, a cage 1 formed of a synthetic resin into a cage-type cylindrical shape between the inner peripheral surface of the intermediate portion of the outer race 11 and the outer peripheral surface of the inner race 6 for roller clutch
3 and a plurality of rollers 14 and springs 15, respectively. The inner circumferential surface of the retainer 13 is engaged with the cam surface 7 of the roller clutch inner ring 6 to prevent relative rotation with respect to the roller clutch inner ring 6. In addition, the rollers 14 are each held rotatably by the holder 13. The springs 15 are provided between the retainer 13 and the rollers 14, respectively, and elastically press the rollers 14 in the same direction with respect to the circumferential direction. still,
In FIG. 1, the spring 15 is schematically shown in a state different from the shape that is actually seen from the circumferential direction in order to show the shape seen from the diameter direction. As described above, the roller clutch 5 including the roller clutch inner ring 6, the outer ring 11, the retainer 13, and the plurality of rollers 14 and the springs 15, respectively, is based on a well-known action, and Between the sleeve 1 in which the inner race 6 is externally fixed and the pulley 3 in which the outer race 11 is internally fixed, only one-way rotational movement can be transmitted.

Each of the support bearings 4 and 4 includes the support bearing inner rings 8 and 8 and portions of the outer ring 11 near both ends in the axial direction. That is, between the outer peripheral surface of each of the inner rings 8 for support bearings and the inner peripheral surface of the outer ring 11 near the axial ends, a cage 16 formed of a synthetic resin in a cage-type cylindrical shape is provided. A plurality of rollers 17 rotatably held by the retainer 16 are arranged to constitute a radial roller bearing.

Floating washers 18, 18 are provided between the outer surfaces of the outer ring-side flanges 12a, 12b and the inner surfaces of the inner ring-side flanges 10, 10, respectively. 12a, 12b and inner ring side flanges 10, 1
It is freely mounted to rotate relative to zero. Each of the above-mentioned floating washers 18 and 18 is made of a metal having self-lubricating properties such as copper, a metal which has been impregnated with a lubricating oil such as a tufftrided metal or an oil-impregnated metal, or a polyamide resin, a polyacetal resin or a polytetrafluoride. It is formed in a ring shape from a synthetic resin having a low friction coefficient such as an ethylene resin. Such floating washers 18, 18
Each of the outer ring side flanges 12a, 12b and the inner ring side flanges 10, 1
It is loosely clamped between zero. The floating washers 18, 18 are guided (to prevent displacement in the radial direction) by the outer peripheral surfaces of the support bearing inner rings 8, 8 or the inner peripheral surface of the pulley 3.

The gaps between the inner peripheral surfaces of the axial ends of the outer race 11 and the outer peripheral surfaces of the inner races 8 for support bearings are closed by seal rings 19, 19, respectively. Each of these seal rings 19, 19 is constituted by a cored bar 20 and an elastic material 21, respectively.
Are fitted and supported on the inner peripheral surfaces of both ends of the elastic member 21 in a state where the outer diameter of the elastic member 21 is elastically reduced. And each elastic material 2
The leading edge of each of a plurality of seal lips provided on each of the seal rings 1 and 21 is slid or abutted on the outer peripheral surfaces of the intermediate portions of the support bearing inner rings 8 and the inner ring surfaces of the outer ring side flange portions 12a and 12b. Let me.

Further, the outer ring side and inner ring side flanges 12a,
A labyrinth seal is provided at a portion where the floating washers 18 and 18 are provided. That is,
The outer diameter of each of the inner ring-side flanges 10, 10 is slightly smaller than the inner diameter of the pulley 3, and
The outer peripheral edge of 10 is brought close to the inner peripheral surface of the pulley 3. Further, the outer diameter of each of the floating washers 18, 18 is made slightly smaller than the inner diameter of the pulley 3, and the inner diameter of each of the floating washers 18, 18 is reduced to the cylindrical portion 9, 9 of the inner ring 8, 8 for each of the support bearings. Slightly larger than the outside diameter of each of these floating washers 1
The inner and outer peripheral edges of 8, 18 are brought close to the outer peripheral surface of each of the cylindrical portions 9, 9 or the inner peripheral surface of the pulley 3. Further, the inner diameter of each of the outer ring-side flanges 12a, 12b is made slightly larger than the outer diameter of each of the cylindrical portions 9, 9 so that the inner peripheral edge of each of the outer ring-side flanges 12a, 12b and each of the cylindrical portions 9 , 9 are brought close to each other. The adjacent portions of the peripheral edge and the peripheral surface of these members each function as a labyrinth seal, and foreign substances such as dust existing around the respective members are sealed with the seal rings 1 and 2.
This is resistance to entering the 9 and 19 sides.

When the rotating shaft of the alternator is driven to rotate by, for example, the crankshaft of the engine by the pulley with a built-in roller clutch of the present invention constructed as described above, the end of the rotating shaft protrudes from the case of the alternator. The sleeve 1 is externally fitted and fixed to the portion. And
An endless belt is stretched between the drive shaft fixed to the end of the crankshaft and the pulley 3. At this time, when the rotational angular velocity of the pulley 3 tends to be faster than the rotational angular velocity of the rotary shaft with respect to the rotational direction of the rotary shaft, the roller clutch 5 is locked, and the rotation of the pulley 3 causes the sleeve 1 to rotate. The mounting direction is regulated so as to be transmitted to the rotating shaft via the shaft. Conversely, if the rotational angular velocity of the pulley 3 is lower than the rotational angular velocity of the rotary shaft with respect to the rotational direction of the rotary shaft, the roller clutch 5 becomes free and the pulley 3 and the rotary shaft To prevent transmission of torque.

In particular, in the case of the pulley with a built-in roller clutch of the present invention, it is possible to prevent the constituent parts from being worn by foreign substances such as dust existing around the pulley, and to secure sufficient durability. That is, the outer ring side flanges 12a and 12b and the inner ring side flange 1
The floating washers 18, 18, which are freely rotatable relative to the outer ring 0, 10, support the thrust load acting between the outer ring 11 and each of the support bearing inner rings 8, 8 while supporting the outer ring side flange portion. The surfaces of the inner ring side flanges 10 and 12a and 12b facing each other are prevented from being worn. That is, the sleeve 1 is attached to the roller clutch 5.
Has a function of regulating the direction of transmission of the rotational force between the sleeve 1 and the pulley 3, but has no function of preventing the sleeve 1 and the pulley 3 from shifting in the thrust direction. In addition, each of the support bearings 4, 4 which is a radial roller bearing,
Although it has a function of supporting a large radial load, it has no function of preventing the sleeve 1 and the pulley 3 from shifting in the thrust direction. Therefore, in the case of the illustrated pulley with a built-in roller clutch, each of the outer ring side flange portions 12a,
12b, inner ring side flanges 10, 10 and floating washers 18, 18, the sleeve 1 and pulley 3
Is prevented from shifting in the thrust direction. Moreover,
Each of the outer ring side flange portions 1 each made of a hard metal.
2a, 12b and the inner ring side flanges 10, 10 are prevented from directly rubbing each other to prevent wear of the respective flanges 12a, 12b, 10, and at the same time, the relative displacement between the sleeve 1 and the pulley 3 is smooth. To be performed.

At both ends of the outer race 11, seal rings 19 are incorporated. Each of these seal rings 19, 19 closes a gap between the inner peripheral surface of both ends of the outer ring 11 and the outer peripheral surface of the intermediate portion of each of the inner rings 8, 8, and the support bearings 4, 4, and the roller clutch. 5 prevents foreign matter such as dust from entering the installation portion. And it contributes to prevention of wear of the components of the support bearings 4 and 4 and the roller clutch 5. In particular, in the case of the illustrated example, since a plurality of stages of labyrinth seals are respectively provided on the outer portions of the seal rings 19, 19, the amount of foreign substances reaching the outer sides of the seal rings 19, 19 is itself reduced. Less. For this reason, the amount of foreign matter that reaches the installation portions of the support bearings 4 and 4 and the roller clutch 5 beyond these seal rings 19 and 19 is extremely small. As a result, the effect of preventing the components of the support bearings 4 and 4 and the roller clutch 5 from being worn can be further improved. Although not shown, the cam surface for constituting the roller clutch 5 may be formed on the inner peripheral surface of the intermediate portion of the outer race 11 instead of the outer peripheral surface of the inner race 6 for the roller clutch.

Next, FIG. 3 shows a second example of the embodiment of the present invention, which also corresponds to the first and second aspects. In the case of this example, the inner raceway and the inner race side flange portion 10a are formed directly on one half (the right side in FIG. 3) of the sleeve 1a, and the support bearing inner race of that portion is omitted. Other configurations and operations are the same as those in the first example described above, and therefore, the same parts are denoted by the same reference numerals, and redundant description will be omitted. In the case of this example, not only the inner ring raceway and the inner ring side flange portion 10a but also the roller clutch inner ring 6 may be provided integrally with the sleeve 1a.

FIG. 4 shows a third embodiment of the present invention, which also corresponds to the first and second aspects of the present invention. In the case of the present example, the outer diameter of the inner raceway portion of the support bearing inner races 8c, 8c that makes contact with the rollers 17, 17 is determined by the seal lip 24 of the elastic members 21, 21 constituting the seal rings 19, 19. , 24 are made smaller than the outer diameter of the portion where the leading edges are in sliding contact. And these two parts,
Each is continuous by the inclined surfaces 23, 23. In this example, the inner ring 8 for a support bearing having such an outer peripheral surface shape is used.
c, 8c, the seal lips 24, 2
4 is prevented from turning over. That is, in order to improve the effect of preventing the entry of foreign matter from the outside by the seal rings 19, it is preferable to incline the seal lips 24, 24 in the outward direction toward the leading edge.

On the other hand, in order to assemble the roller clutch built-in pulleys of the first and second examples, the seal lip 2
The inner rings 8c, 8 for the support bearings above
When inserting the support bearing inner ring 8,
c, 8c and the seal lip 2
Each of these seal lips 24, 24 may be turned over based on the abutment of the 4, 4 with the leading edge. On the other hand, in the case of this example, the inner rings 8c, 8c
Because the outer diameter of the inner edge of the seal lip is small, the inner edge of each of these seals does not collide with the tip edge of each of the seal lips 24, 24,
Each of the support bearing inner rings 8c, 8c is easily inserted into the inner diameter side of each of the seal lips 24, 24. The seal lips 24, 24 that have entered the outer diameter side of the inner ring raceway portion further push the support bearing inner rings 8 c, 8 c into the seal lips 24, 24, and the inclined surfaces While the inside diameter is widened by 23, 23, the seal lip 24, 24 moves to a portion where the leading edge of the seal lip 24 comes into sliding contact. For this reason, in the state where the assembly of the roller clutch built-in type pulley is completed, the seal lips 24, 24 are not turned up, but are kept inclined in the outward direction toward the leading edge, so that a good sealing effect is obtained. Can be obtained. The configuration and operation of the other parts
Since this is the same as the case of the first example described above, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

Next, FIG. 5 corresponds to claims 2 and 3.
14 shows a fourth example of an embodiment of the present invention. In the case of this example, outer ring-side flange portions 12c and 12d each having an inward flange shape are formed at the end of the outer ring 11a. And
The inner peripheral edges of the outer ring side flanges 12c, 12d are projected inward in the diametric direction from the inner peripheral surfaces of the cylindrical inner rings 8a, 8a for support bearings, each of which is formed in a cylindrical shape. A stepped portion 2 is provided on each of the outer diameter side halves of both end surfaces in the axial direction of the sleeve 1b.
2 and 22 are formed, and the support bearing inner rings 8a, 8
The outer end of “a” covers the inner-half outer-diameter-side openings of these step portions 22, 22. And each outer ring side flange 1
Floating washers 18, 18 are respectively provided between the inner side surfaces of the inner diameter side end portions 2c, 12d and the outer side surfaces of the step portions 22, 22, which are axial end surfaces of the sleeve 1b. 12d and the sleeve 1b are freely mounted for relative rotation. Further, a pair of seal rings 19, 19 are provided between the inner peripheral surfaces of both ends of the outer ring 11a and the outer peripheral surfaces of the outer ends of the support bearing inner rings 8a, 8a.

According to the structure of the present embodiment configured as described above,
Regardless of the difference between the inner diameter of the pulley 3 and the outer diameter of the sleeve 1b, the width of each of the floating washers 18, 18 in the diametric direction can be set. Therefore, according to the thrust load acting between the pulley 3 and the sleeve 1b,
The pressure receiving area of each of the floating washers 18, 18 is set, and wear of the floating washers 18, 18 and the facing member can be effectively prevented. That is, the wear of the sliding bearing including the structures of the floating washers 18, 18 and the like is a function of the PV value which is the product of the surface pressure (P) and the sliding speed (V). It is known that this can be done. In the case of this example, it is possible to widen the pressure receiving area and reduce the surface pressure P. Moreover, in the case of this example, each of the above-mentioned floating washers 18, 1
Since the sliding speed V between each of the floating washers 18 and 18 and the opposing member can be reduced by reducing the diameter of 8, the wear prevention effect can be more excellent. Other configurations and operations are the same as those of the above-described first example.
The same parts are denoted by the same reference numerals, and duplicate description will be omitted.

Next, FIG. 6 corresponds to claims 2 and 4.
15 shows a fifth example of the embodiment of the present invention. In the case of this example, the outer end portions of the pair of support bearing inner rings 8b, 8b are respectively provided on the outer ring side inner ring side flange portions 10b, 1b.
0b. And each of these inner ring side flanges 10
The outer peripheral edges of b and 10b protrude radially outward from the outer peripheral surface of the outer ring 11. Steps 22a and 22a are respectively formed at the inner diametrical halves of both ends in the axial direction of the pulley 3a.
a, 22a covers the inner half inner diameter side opening. The stepped portions 22, which are the inner surfaces of the outer-diameter end portions of the inner ring-side flange portions 10 b and 10 b and the axial end surface of the pulley 3 a,
Floating washers 18, 18 are provided between the inner ring side flanges 10b, 10a and
b and the pulley 3a are freely mounted for relative rotation. Also in the case of this example having such a configuration, similarly to the case of the above-described fourth example, regardless of the difference between the inner diameter of the pulley 3a and the outer diameter of the sleeve 1, each of the floating washers 18,
Since the width dimension in the diameter direction of 18 can be set, the pressure receiving area of each of the floating washers 18 and 18 is set according to the thrust load acting between the pulley 3a and the sleeve 1, and each of these floating washers 18 is set. ,
18 and the opposed members can be effectively prevented from being worn. Other configurations and operations are the same as those in the first example described above, and therefore, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

The roller pulley with a built-in roller clutch of the third example uses the support bearing inner rings 8c, 8c in place of the support bearing inner rings 8a, 8a of the roller clutch with a built-in roller clutch of the first example. It is. Similarly to this case, the pulleys with a built-in roller clutch of the second, fourth, and fifth examples also have a slanted portion on the outer peripheral surface of the intermediate portion, similarly to the support bearing inner rings 8c, 8c. Can also be used.

[0036]

The pulley with a built-in roller clutch according to the present invention is constructed and operates as described above. Therefore, the life extension of the belt for driving the pulley to rotate and the power generation efficiency when combined with the alternator are reduced. As a result, the durability of the roller clutch built-in type pulley itself can be improved.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view schematically showing a first example of an embodiment of the present invention.

FIG. 2 is a diagram showing only a roller clutch inner ring taken out and viewed from a side in FIG. 1;

FIG. 3 is a partially enlarged cross-sectional view schematically illustrating a second example of the embodiment of the present invention;

FIG. 4 is a partially enlarged cross-sectional view schematically showing a part of the third example.

FIG. 5 is a partially enlarged cross-sectional view showing the fourth example with a part thereof omitted.

FIG. 6 is a partially enlarged cross-sectional view showing the fifth example with a part being omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b Sleeve 2 Female spline part 3, 3a Pulley 4 Support bearing 5 Roller clutch 6 Inner ring for roller clutch 7 Cam surface 8, 8a, 8b, 8c Inner ring for support bearing 9 Cylindrical part 10, 10a, 10b Inner ring side flange Part 11, 11a Outer ring 12a, 12b, 12c, 12d Outer ring side flange 13 Retainer 14 Roller 15 Spring 16 Retainer 17 Roller 18 Floating washer 19 Seal ring 20 Core metal 21 Elastic material 22, 22a Step 23 Slope 24 Seal lip

Claims (4)

[Claims] 1. A sleeve which can be externally fitted and fixed to a rotary shaft, a pulley having a cylindrical inner peripheral surface disposed around the sleeve and concentrically with the sleeve, an outer peripheral surface of these sleeves and an inner periphery of the pulley. Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and a support bearing that allows relative rotation between the sleeve and the pulley while supporting the radial load applied to the pulley, In a roller clutch built-in type pulley having a roller clutch capable of freely transmitting a rotational force between the pulley and the sleeve only when the pulley and the sleeve rotate relative to each other in a predetermined direction, A roller clutch inner ring fixed to the outer peripheral surface of the roller clutch, and at least one support shaft fixed to a portion of the outer peripheral surface of the sleeve that is axially displaced from the roller clutch inner ring. A receiving inner ring, and an outer ring fixed to the inner peripheral surface of the pulley, wherein the roller clutch includes an intermediate inner peripheral surface of the outer ring and an outer peripheral surface of the roller clutch inner ring. The support bearing includes an inner ring for the support bearing and a portion near the axial end of the outer ring, and an inward flange-shaped outer ring-side flange portion at an end of the outer ring, the inner ring for the support bearing. Outer flange-shaped inner ring-side flanges are formed at the end portions facing the outer ring-side flanges, and floating washers are provided between the outer ring-side flanges and the inner ring-side flanges. A pulley with a built-in roller clutch, wherein the pulley is freely rotatable relative to a flange and an inner ring side flange. 2. A sleeve which can be externally fitted and fixed to a rotating shaft, a pulley having a cylindrical inner peripheral surface disposed around the sleeve and concentric with the sleeve, an outer peripheral surface of these sleeves and an inner periphery of the pulley. Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and a support bearing that allows relative rotation between the sleeve and the pulley while supporting the radial load applied to the pulley, In a roller clutch built-in type pulley having a roller clutch capable of freely transmitting a rotational force between the pulley and the sleeve only when the pulley and the sleeve rotate relative to each other in a predetermined direction, A roller clutch inner ring fixed to the outer peripheral surface of the roller clutch, and at least one support shaft fixed to a portion of the outer peripheral surface of the sleeve that is axially displaced from the roller clutch inner ring. A receiving inner ring, and an outer ring fixed to the inner peripheral surface of the pulley, wherein the roller clutch includes an intermediate inner peripheral surface of the outer ring and an outer peripheral surface of the roller clutch inner ring. The support bearing includes an inner ring for the support bearing and a portion near the axial end of the outer ring, and a gap between the inner peripheral surface of the axial end of the outer ring and the outer peripheral surface of the inner ring for the support bearing. A pulley with a built-in roller clutch, characterized in that the gap is closed by a seal ring. 3. A sleeve which can be externally fitted and fixed to a rotating shaft, a pulley having a cylindrical inner peripheral surface disposed concentrically with the sleeve around the sleeve, an outer peripheral surface of these sleeves and an inner periphery of the pulley. Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and a support bearing that allows relative rotation between the sleeve and the pulley while supporting the radial load applied to the pulley, In a roller clutch built-in type pulley having a roller clutch capable of freely transmitting a rotational force between the pulley and the sleeve only when the pulley and the sleeve rotate relative to each other in a predetermined direction, A roller clutch inner ring fixed to the outer peripheral surface of the roller clutch, and at least one support shaft fixed to a portion of the outer peripheral surface of the sleeve that is axially displaced from the roller clutch inner ring. A receiving inner ring, and an outer ring fixed to the inner peripheral surface of the pulley, wherein the roller clutch includes an intermediate inner peripheral surface of the outer ring and an outer peripheral surface of the roller clutch inner ring. The support bearing includes an inner ring for the support bearing and a portion near the axial end of the outer ring, and has an inward flange shape at an end of the outer ring, and an inner peripheral edge portion of the inner periphery of the inner ring for the support bearing. An outer ring side flange portion projecting inward in the diameter direction from the surface is formed, and a floating washer is provided between the outer ring side flange portion and the axial end surface of the sleeve relative to the outer ring side flange portion and the sleeve. A pulley with a built-in roller clutch characterized by being freely rotatable. 4. A sleeve which can be externally fitted and fixed to a rotating shaft, a pulley having a cylindrical inner peripheral surface disposed concentrically with the sleeve around the sleeve, an outer peripheral surface of these sleeves and an inner periphery of the pulley. Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and a support bearing that allows relative rotation between the sleeve and the pulley while supporting the radial load applied to the pulley, In a roller clutch built-in type pulley having a roller clutch capable of freely transmitting a rotational force between the pulley and the sleeve only when the pulley and the sleeve rotate relative to each other in a predetermined direction, A roller clutch inner ring fixed to the outer peripheral surface of the roller clutch, and at least one support shaft fixed to a portion of the outer peripheral surface of the sleeve that is axially displaced from the roller clutch inner ring. A receiving inner ring, and an outer ring fixed to the inner peripheral surface of the pulley, wherein the roller clutch includes an intermediate inner peripheral surface of the outer ring and an outer peripheral surface of the roller clutch inner ring. The support bearing includes an inner ring for the support bearing and a portion near an axial end of the outer ring. An outer flange is formed on an end of the inner ring for the support bearing so that an outer peripheral edge is an outer peripheral surface of the outer ring. The inner ring-side flange portion protruding outward in the diametric direction is formed, and a floating washer is provided between the inner ring-side flange portion and the axial end face of the pulley, and the relative rotation of the floating washer with respect to the inner ring-side flange portion and the pulley. A pulley with a built-in roller clutch characterized by freely mounting.