JPH11148549A - Pulley with built-in roller clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish possibility of installing in a restricted space by lessening the axial direction dimension while a support bearing and a part for installation of roller clutch are precluded from intrusion of foreign matter. SOLUTION: The inner circumferential edges of seal lips 23 are fixed to the outer circumferential edges of inner ring flange parts 10a formed at the outer extremities of the inner rings 8a for support bearing. The outer circumferential edges of the seal lips 23 are put in slide contact with the side faces of ring-shaped recesses 22 formed at the end face of a pulley 3a. Thereby the structure for achievement of a seal is precluded from enlargement in the dimension in the axial direction.

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 a driven pulley fixed to the end of the rotating shaft of the engine accessory and the drive pulley, and the engine accessory is rotatable 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,
At low rotations, 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 with the driven pulley, causing slippage between the endless belt and the driven pulley, or shortening the life of the endless belt. Becomes

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.

On the other hand, in the case of a conventionally known pulley with a built-in roller clutch, a support bearing and a roller clutch are incorporated 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 enough to consider the securing of durability, which is necessary with the situation. That is, in the case of a pulley with a built-in roller clutch used for driving an engine auxiliary machine incorporated in an engine room or the like, such as an alternator, since a large amount of dust is present in the surrounding space,
In order to ensure the durability, it is necessary to prevent the dust from entering the inside and to prevent wear of each component based on the dust.

[0009]

DESCRIPTION OF THE PRESENT INVENTION In view of such circumstances, the present inventor has previously invented a pulley with a built-in roller clutch as shown in FIGS. 5 and 6 (Japanese Patent Application No. 8-319498). First, the roller clutch built-in type pulley according to the prior invention will be described. 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 provided around such a sleeve 1.
Are arranged concentrically with the sleeve 1. The pulley 3 has a cylindrical inner peripheral surface and a stepped (gear-shaped) outer peripheral surface. The outer peripheral surface may have another shape such as a V-shaped groove.
Further, the structure for preventing the relative rotation between the rotary shaft and the sleeve 1 may be replaced by a screw, a fitting of non-cylindrical surfaces, a key engagement, or the like instead of the spline.

A pair of support bearings 4 and 4 and a 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 roller clutch inner ring 6 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. Also, each of these support bearing inner rings 8, 8 made of hard metal such as bearing steel, has an L-shaped cross-section by forming an outward flange-shaped inner ring side flange portion 10 on the outer end edge of the cylindrical portion 9. And 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. 5) 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 1 (right side in FIG. 5)
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 the 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. The positioning of the retainer 13 in the axial direction is performed by regulating the movement of the retainer 13 by the end surfaces of the cylindrical portions 9 and 9 of the support bearing inner rings 8 and 8. 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. In FIG. 5, the spring 15 is schematically shown in a state different from the shape seen when viewed from the circumferential direction in order to show the shape as viewed 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 includes an inner ring 8 for the support bearing and a portion 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 are provided between the outer surfaces of the outer ring flanges 12a and 12b and the inner surfaces of the inner ring flanges 10 and 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 ring 11 and the outer peripheral surfaces of the inner rings 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. Also, 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 each of the support bearing inner rings 8, 8. 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 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 rotary 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 according to the invention, the end of the rotary 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 roller clutch built-in type pulley of the prior 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. Particularly, in the case of the example shown in the figure, 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.

[0021]

In the case of the above-described pulley with a built-in roller clutch, the support bearing 4,
4 and the roller clutch 5 and the seal rings 19, 19 having a relatively large axial dimension are arranged in series with each other in the axial direction. Therefore, it is inevitable that the axial dimension (thickness) of the entire pulley with a built-in roller clutch becomes large. On the other hand, the space for incorporating the roller clutch built-in pulley is limited, and particularly, the dimension in the axial direction is often small. Therefore, realization of a roller clutch built-in type pulley having a smaller axial dimension is desired. The pulley with a built-in roller clutch of the present invention was invented in view of such circumstances.

[0022]

The pulley with a built-in roller clutch according to the present invention is externally fixed to a rotating shaft in the same manner as the pulley with a built-in roller clutch disclosed in the above-mentioned publications. A free sleeve, a pulley having a cylindrical inner peripheral surface disposed concentrically with the sleeve around the sleeve, and provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and applied to the pulley. A support bearing that allows relative rotation between the sleeve and the pulley while supporting a radial load, and a support bearing provided between an outer peripheral surface of the sleeve and an inner peripheral surface of the pulley, and the pulley and the sleeve rotate relative to each other in a predetermined direction. And a roller clutch that enables the transmission of the rotational force between the pulley and the sleeve only when the rotation is performed.

In particular, in the roller clutch built-in pulley of the present invention, one peripheral edge of a ring-shaped flange is attached to the axial end of one of the sleeve and the pulley. The member is fixed so as to overlap with the axial end of the member in the diametrical direction. Further, an annular concave portion that is concave in the axial direction is formed at a portion of the other end of the sleeve and the pulley in the axial direction facing the other peripheral portion of the flange.
A distal end edge of a seal lip made of an elastic material having a base end portion attached to the other peripheral portion of the flange portion is slidably in contact with a part of the annular concave portion.

[0024]

In the case of the pulley with a built-in roller clutch of the present invention configured as described above, similarly to the pulley with a built-in roller clutch of the above-mentioned invention, the constituent parts are prevented from being worn by dust existing around the pulley. As a result, sufficient durability can be secured. That is, since the opening end of the annular space existing between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley is closed by the flange and the seal lip, foreign matter such as dust does not enter the annular space. . Therefore, it is possible to effectively prevent the components such as the support bearing and the roller clutch installed in the annular space from being significantly worn. Moreover, the member arranged in series with the support bearing and the roller clutch in the axial direction is a flange portion having a small thickness. The seal lip having a large thickness does not overlap the support bearing and the roller clutch in the axial direction. Accordingly, the axial dimension of the entire pulley with a built-in roller clutch is reduced, and installation in a limited space becomes easy.

[0025]

FIG. 1 shows a first embodiment of the present invention. The feature of the pulley with a built-in roller clutch of the present invention is that the sleeve 1 is provided to prevent foreign matter from entering the installation portions of the support bearings 4 and 4 and the roller clutch 5 while suppressing (reducing) the axial dimension. The seal structure is designed to close the openings at both ends of the annular space between the outer peripheral surface of the pulley 3a and the inner peripheral surface of the pulley 3a. The structure and operation of the other parts, such as the structure of the support bearings 4 and 4 and the roller clutch 5, the structure of the floating washer 18, 18 installation part, and the like are the same as the structure of the prior invention shown in FIGS. The same parts are denoted by the same reference numerals, and redundant description will be omitted or simplified. Hereinafter, description will be made focusing on characteristic parts of the present invention.

At both ends of the sleeve 1, a pair of support bearing inner rings 8a, 8a, each having an L-shaped cross section, are externally fitted and fixed. Made of hard metal such as bearing steel,
These support bearing inner rings 8a, 8a correspond to the outer edge of the cylindrical portion 9, respectively, and correspond to the flange portion in the claims.
An outward flange-shaped inner ring side flange portion 10a is formed. In the case of this example, the outer diameter of each of the inner ring-side flanges 10a and 10a is made larger than the inner diameter of the pulley 3a, and the outer peripheral edge portions of each of the inner ring-side flanges 10a and 10a and the axial direction of the pulley 3a. The ends overlap each other in the axial direction. In addition, an axial end portion of the pulley 3a has a half portion on the inner diameter side.
The annular recesses 22 are recessed in the axial direction. Each of the inner ring side flanges 10a, 10a is
By arranging the inner ring-side flanges 10a, 10a and the axial ends of the pulleys 3a in the diametrical direction by disposing them on the inner diameter sides of 2, 22. Then, the distal ends of the seal lips 23, 23 made of an elastic material and having the inner peripheral edge, which is the base end thereof, attached to the outer peripheral edge of the inner ring side flanges 10a, 10a are attached to the side faces of the annular recesses 22, 22, respectively. In sliding contact.

In the case of the pulley with a built-in roller clutch of the present invention constructed as described above, similarly to the above-mentioned pulley with a built-in roller clutch, the constituent parts are prevented from being worn out by dust existing around the pulley. As a result, sufficient durability can be secured. That is, the outer peripheral surface of the sleeve 1 and the pulley 3a
The open ends of the annular space existing between the inner ring side flanges 10a, 10a and the seal lips 23, 23
Thus, foreign matter such as dust does not enter the annular space. Therefore, the components such as the support bearings 4 and 4 and the roller clutch 5 installed in the annular space can be effectively prevented from being significantly worn.

Further, the members arranged in series in the axial direction with the support bearings 4 and 4 and the roller clutch 5 include outer diameter side flanges 12a and 12b and a floating washer 1.
Other than 8, 18, the inner ring side flange portion 10a having a small thickness dimension,
10a only. The seal rings 19, 19 (FIG. 5) which are arranged in series in the axial direction with the support bearings 4, 4 and the roller clutch 5 in the above-described conventional structure are omitted, and the seal lip 23 having a large thickness is used. 23 does not overlap the support bearings 4, 4 and the roller clutch 5 in the axial direction. Accordingly, the axial dimension of the entire pulley with a built-in roller clutch is reduced, and installation in a limited space becomes easy. 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.

FIG. 2 shows a second embodiment of the present invention.
An example is shown. In the case of this example, the width (axial dimension) of the pulley 3b is larger than the width of the sleeve 1. Then, the outer peripheral edge of each seal lip 23, 23 attached to the outer peripheral edge of each inner ring side flange portion 10a, 10a is
b, the inner peripheral surfaces of the annular concave portions 22, 22 formed on both end surfaces are slidably contacted. The structure of this example is effective when it is necessary to wrap a wide endless belt. The other configurations and operations are the same as those of the first example described above, and therefore, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 3 shows a third embodiment of the present invention.
An example is shown. In the case of this example, the outer race 11a which is fitted and fixed to the pulley 3c and the inner races 8b and 8b for support bearings which are fitted and fixed to both ends of the sleeve 1a are provided with outer ring side flange portions 12a and 12b and inner ring side flange portion 10. , 10a (FIG. 1,
It is formed in a simple cylindrical shape without any of 2, 5).
Locking grooves 24, 24 are formed at the diametrically intermediate portions of both end surfaces of the pulley 3c. The pulley 3c
Are wider on the outer diameter side and narrower on the inner diameter side than the respective locking grooves 24, 24. And each of these locking grooves 2
The outer peripheral edges of the metal cores 25, 25 are locked to the reference numerals 4, 24, respectively. Each of these metal cores 25, 25 is formed by bending a metal plate to form an entire ring having an L-shaped cross section. Each of the metal cores 25, 25 corresponds to a flange in the scope of the claims. A fitting cylindrical portion 27 is formed on the periphery. The inner diameter of the flange 26 is smaller than the outer diameter of the sleeve 1a. Such a core metal 25 is fixed to the opening at both ends of the pulley 3c by fitting and fixing the fitting cylindrical portions 27, 27 to the locking grooves 24, 24.

As described above, the mandrel 25, 25 is connected to the pulley 3
c, the flanges 26, 2
6 and the axial end of the sleeve 1a,
They overlap each other in the axial direction. Further, annular concave portions 22a, 22a which are concave in the axial direction are formed in the outer diameter side half of the axial end of the sleeve 1a. Each of the above flanges 2
The collars 6 and 26 are arranged on the outer diameter side of the annular recesses 22a and 22a, so that the flanges 26 and 26 and the axial end of the sleeve 1a are overlapped in the diameter direction. A seal lip 2 made of an elastic material having inner peripheral edges of the flanges 26, 26 attached to an outer peripheral edge which is a base end thereof.
3a, 23a, the edge of each of the annular recesses 22a, 22
It is in sliding contact with the side surface of a.

In addition, locking projections 28, 28 are formed on the side of each of the annular concave portions 22a, 22a near the outer diameter. The floating washers 18, 18 are rotatably locked around the locking ridges 28, 28, respectively. Also in the case of the structure of this example having such a structure, the components such as the support bearings 4 and 4 and the roller clutch 5 can be effectively prevented from being significantly worn, and furthermore, the axial direction of the pulley with a built-in roller clutch as a whole. The small size facilitates installation in a limited space.

FIG. 4 shows a fourth embodiment of the present invention.
An example is shown. In the case of this example, one end (the left end in FIG. 4) of the pulley 3c and the sleeve 1b is closed by a disk-shaped lid plate 29. The cover plate 29 is formed in a petri dish shape by bending a metal plate. The fitting tube portion 27a formed on the outer peripheral edge is fitted into the locking groove 24 formed on the end surface of the pulley 3c. , The pulley 3
One end of the opening c is closed. Further, a step portion 30 is formed at a portion closer to the outer diameter of one end surface (the left end surface in FIG. 4) of the sleeve 1b, and a floating washer 18 is provided between the step portion 30 and the cover plate 29. The rotating shaft not shown
The other end of the sleeve 1b is inserted into the sleeve 1b. Since the configuration and operation of the other parts are the same as those of the above-described third example, the same parts are denoted by the same reference numerals, and duplicate description will be omitted.

[0034]

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 and the size of the pulley with a built-in roller clutch can be improved and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view showing a first example of an embodiment of the present invention, with a part thereof being omitted.

FIG. 2 is a partially enlarged cross-sectional view showing the second example with a part thereof omitted.

FIG. 3 is a partially enlarged cross-sectional view showing the third example with a part thereof omitted;

FIG. 4 is a partially enlarged cross-sectional view showing the fourth example with a part thereof omitted;

FIG. 5 is a partially enlarged cross-sectional view schematically showing a part of the roller clutch built-in pulley of the prior invention.

FIG. 6 is a view showing only a roller clutch inner ring taken out and viewed from the side in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b Sleeve 2 Female spline part 3, 3a, 3b, 3c Pulley 4 Support bearing 5 Roller clutch 6 Inner ring for roller clutch 7 Cam surface 8, 8a, 8b Inner ring for support bearing 9 Cylindrical part 10, 10a Inner ring side flange Part 11, 11a Outer ring 12a, 12b Outer ring side flange portion 13 Cage 14 Roller 15 Spring 16 Cage 17 Roller 18 Floating washer 19 Seal ring 20 Core metal 21 Elastic material 22, 22a Annular recess 23, 23a Seal lip 24 Lock groove 25 core metal 26 flange 27, 27a fitting cylinder 28 locking ridge 29 cover plate 30 step

Claims (1)

[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 the roller clutch built-in type pulley provided with a roller clutch capable of freely transmitting a rotational force between the pulley and the sleeve only when the pulley and the sleeve relatively rotate in a predetermined direction, the sleeve and the pulley The one peripheral edge of the annular flange is fixed to the axial end of one of the members in a state of being diametrically overlapped with the axial end of the one member, and the sleeve and the pulley are fixed to each other. An axially concave annular concave portion is formed at a portion facing the other peripheral portion of the flange portion at an axial end portion of the other member, and a proximal end portion is formed at the other peripheral portion of the flange portion. A roller clutch built-in type pulley characterized in that a distal end edge of a seal lip made of an elastic material to which is attached a sliding contact with a part of the annular concave portion.