JP2005321007A - Pulley device with built-in one-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley device with a built-in one-way clutch, setting an internal clearance gap of a support bearing to a suitable value, preventing a one-way clutch from being engaged in its eccentric state, and achieving improvement of durability and prevention of operational failure at low cost. <P>SOLUTION: This pulley device with the built-in one-way clutch includes the one-way clutch 10 and a pair of support bearings 9, 9 provided between the outer peripheral surface of a sleeve 8 and the inner peripheral surface of a pulley 7a. In the paired support bearings 9, 9, the right end part 8a of the sleeve 8 is rocked and caulked to surely apply pre-load and the internal clearance gaps of the support bearings 9, 9 are set to zero or minus. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pulley device with a built-in one-way clutch.

  Generally, a pulley device with a built-in one-way clutch is fixed to an end of a rotating shaft of an alternator that is a generator for an automobile, for example, and is endless between a driving pulley fixed to an end of an engine crankshaft. Used to drive the alternator by hanging the belt.

  2. Description of the Related Art Conventionally, an alternator structure that generates power necessary for an automobile using an automobile traveling engine as a drive source is known (see, for example, Patent Document 1). FIG. 3 shows an alternator 1 described in Patent Document 1. Inside the housing 2, a rotating shaft 3 is rotatably supported via a pair of rolling bearings 4 and 4. A rotor 5 and a commutator 6 are provided at an intermediate portion of the rotating shaft 3. Further, a driven pulley 7 is fixed to a portion protruding from the housing 2 at one end portion (right end portion in FIG. 3) of the rotating shaft 3. In an assembled state to the engine, the endless belt is passed over the driven pulley 7 so that the rotating shaft 3 can be driven to rotate by the crankshaft of the engine.

  Conventionally, the driven pulley 7 is generally fixed only to the rotary shaft 3. On the other hand, in recent years, when the travel speed of the endless belt is constant or increasing, the power transmission from the endless belt to the rotating shaft can be freely performed, and the travel speed of the endless belt tends to decrease. In this case, various one-way clutch built-in type pulley devices that allow relative rotation between the driven pulley and the rotating shaft have been proposed and used in part (see, for example, Patent Documents 2 to 7).

  The one-way clutch built-in type pulley apparatus described in Patent Documents 2 to 7 includes a sleeve that can be fitted and fixed to the rotating shaft of the alternator, and a driven pulley having a cylindrical inner peripheral surface around the sleeve. It is arranged concentrically with the sleeve. A pair of support bearings and a one-way clutch are provided between the outer peripheral surface of these sleeves and the inner peripheral surface of the driven pulley. Among these, the support bearing allows the relative rotation between the sleeve and the driven pulley while supporting a radial load applied to the driven pulley. On the other hand, the one-way clutch allows transmission of rotational force from the driven pulley to the sleeve only when the driven pulley rotates in a predetermined direction with respect to the sleeve.

The reason why the pulley device with a built-in one-way clutch as described above is used is to reduce the life reduction of the endless belt due to the slip between the endless belt and the driven pulley. If the travel speed of the endless belt is constant or tends to increase, the rotational force from the driven pulley to the rotary shaft 3 can be freely transmitted. Conversely, if the travel speed of the endless belt tends to decrease, Relative rotation between the driven pulley and the rotating shaft 3 is made free. That is, when the traveling 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 rotary shaft 3, and the contact portion between the endless belt and the driven pulley rubs strongly. To prevent. In this way, the direction of the stress acting on the rubbing portion between the driven pulley and the endless belt is made constant, and slippage occurs between the endless belt and the driven pulley, or the endless belt Prevents the life from decreasing.
JP-A-7-139550 JP-A-56-101353 JP 7-317807 A JP-A-8-61443 JP-A-8-226462 Japanese Patent Publication No.7-72585 French Patent Publication FR2726059A1

  By the way, in the pulley apparatus with a built-in one-way clutch as described above, a radial roller bearing or a radial ball bearing has conventionally been used as a pair of support bearings. When a pair of radial roller bearings is used as the pair of support bearings, this can be sufficiently supported even when a radial load applied to the driven pulley is large. However, in the case of the radial roller bearing, since the thrust load applied to the driven pulley cannot be supported, it is necessary to provide a separate component such as a thrust washer to support the thrust load. However, providing such separate parts not only complicates assembly work and parts management, but also has excellent heat resistance to ensure the durability of the grease regardless of the heat generated by sliding friction. Expensive grease must be used. In order to avoid an increase in cost due to such a cause, it is preferable that the pair of support bearings be ball bearings capable of supporting both a radial load and a thrust load.

  On the other hand, in the pulley device with a built-in one-way clutch, the thickness dimension of the inner ring and the outer ring constituting the support bearing is limited to be considerably small due to the limited space to be installed. For this reason, when the inner ring and the outer ring are press-fitted into the sleeve and the driven pulley, respectively, and fitted with an interference fit, the elastic deformation amount of the inner ring and the outer ring can be increased to a level that cannot be ignored based on the tightening allowance. There is sex. And when this elastic deformation amount becomes large, the variation | change_quantity of the radial gap in the said support bearing may become large (a radial gap varies in the range of 10-60 micrometers, for example).

  When the variation amount of the radial gap in the support bearing becomes large in this way, the radial gap becomes excessive, and various inconveniences as described below may occur. That is, when the radial clearance in the support bearing becomes excessive, a clutch engagement member such as a roller or a sprag is provided in a state where the inner ring of the clutch and the outer ring of the clutch which are provided adjacent to the support bearing are greatly decentered from each other. There is a possibility of meshing with. If the gears are engaged with each other with a large eccentricity, the one-way clutch cannot function correctly.

  The present invention has been made in view of the circumstances as described above, and its purpose is to set the internal clearance of the support bearing to an appropriate value and prevent the one-way clutch from engaging in an eccentric state, and is low-cost and durable. An object of the present invention is to provide a pulley device with a built-in one-way clutch that can improve performance and prevent the occurrence of malfunction.

The above object is achieved by the following configurations.
(1) Sleeve and
A pulley disposed concentrically with the sleeve around the sleeve;
Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and only between the pulley and the sleeve when one of the pulley and the sleeve tends to rotate relative to the other in a predetermined direction. A one-way clutch that allows free transmission of rotational force
A support bearing provided between an outer peripheral surface of the sleeve and an inner peripheral surface of the pulley, which supports a radial load applied to the pulley and allows relative rotation between the sleeve and the driven pulley; A pulley device with a built-in one-way clutch,
The one-way clutch built-in type pulley apparatus, wherein the support bearing is preloaded by caulking a part of the sleeve.
(2) The support bearing includes an inner ring, an outer ring, and rolling elements provided between the inner ring and the outer ring, and the outer ring of the support bearing is formed integrally with the pulley, and the support The pulley apparatus with a built-in one-way clutch according to (1), wherein an inner ring of the bearing is integrated with the sleeve.
(3) The pulley apparatus with a built-in one-way clutch according to (1) or (2), wherein the support bearing is an angular ball bearing.
(4) The pulley apparatus with a built-in one-way clutch according to any one of (1) to (3), wherein the sleeve is swaged.

  In the case of the pulley apparatus with a built-in one-way clutch according to the present invention configured as described above, a positive preload is applied to the support bearing by caulking, so that the clearance of the support bearing can be reduced to zero or minus, and the one-way clutch Can be prevented from being engaged with each other in an eccentric state, and durability can be improved and malfunction can be prevented at low cost.

  Hereinafter, a pulley device with a built-in one-way clutch according to each embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the one-way clutch-equipped pulley apparatus of the present embodiment has a sleeve 8 that can be externally fitted and fixed to a rotating shaft (not shown) of an alternator. A driven pulley 7 a is disposed concentrically with the sleeve 8 around the sleeve 8. Between the outer peripheral surface of the sleeve 8 and the inner peripheral surface of the driven pulley 7a, a roller clutch 10 that is a one-way clutch, and a pair of support bearings 9 and 9 at a position sandwiching the roller clutch 10 from both sides in the axial direction, , Is provided.

  The driven pulley 7a is formed in a cylindrical shape as a whole, and a part of an endless belt called a poly V belt can be freely passed around the outer peripheral surface of the center portion with a cross-sectional shape extending in the width direction as a waveform.

  The entire sleeve 8 is also formed in a cylindrical shape, and is fitted and fixed to the end of the rotating shaft of the alternator 1 so as to be rotatable together with the rotating shaft. For this reason, as shown in FIG. 1, a screw hole portion 11 is formed on the inner peripheral surface of the intermediate portion of the sleeve 8, and the male screw portion (not shown) provided on the screw hole portion 11 and the outer peripheral surface of the tip end portion of the rotating shaft. ) Can be screwed together. Further, a locking hole portion 12 having a hexagonal cross section is formed on the inner peripheral surface of the distal end portion (left end portion in FIG. 1) of the sleeve 8, and a hexagon wrench or the like is formed in the locking hole portion 12. The tip of the tool can be locked freely. Furthermore, the inner peripheral surface of the base end portion (the right end portion in FIG. 1) of the sleeve 8 is a circular hole portion 13 that can be fitted to the middle portion of the distal end portion of the rotating shaft without looseness. In addition, you may employ | adopt other structures, such as a spline engagement, a non-circular fitting, and a key engagement, as the structure combined so that the sleeve 8 and a rotating shaft may not rotate relatively.

  The support bearings 9, 9 support the radial load applied to the driven pulley 7 a while allowing the relative rotation between the driven pulley 7 a and the sleeve 8. In the illustrated example, a deep groove type angular ball bearing is used as the support bearings 9. That is, each of these support bearings 9 and 9 includes inner rings 23 and 23 having inner ring raceway surfaces 21 and 21 on outer peripheral surfaces, outer rings 29 and 29 having outer ring raceway surfaces 22 and 22 on inner peripheral surfaces, and inner rings, respectively. Balls 24 and 24, which are rolling elements, are provided between the raceway surfaces 21 and 21 and the outer ring raceway surfaces 22 and 22, respectively, so as to be freely rollable. In addition, by installing seals 30 and 30 in locking grooves 25 and 25 formed on the inner peripheral surfaces of both ends of the outer rings 29 and 29, respectively, the openings at both ends of the space where the balls 24 and 24 are installed are blocked. .

  The roller clutch 10 can freely transmit the rotational force between the driven pulley 7a and the sleeve 8 only when the driven pulley 7a tends to rotate relative to the sleeve 8 in a predetermined direction. The roller clutch 10 includes a clutch inner ring 14, a clutch outer ring 17, a plurality of rollers 18 and 18 that are engaging elements, and a clutch retainer 20.

  The clutch inner ring 14 is formed into a cylindrical shape as a whole by subjecting a steel plate such as carburized steel to plastic working such as press working, and a cam surface 15 is formed on the outer peripheral surface. That is, a plurality of concave portions called ramp portions are formed at equal intervals in the circumferential direction on the outer circumferential surface of the clutch inner ring 14, and this outer circumferential surface is used as the cam surface 15.

  Of the inner peripheral surface of the clutch outer ring 17 that is fitted and fixed to the inner peripheral surface of the axially intermediate portion of the driven pulley 7a by an interference fit, at least the axially intermediate portion that contacts the rollers 18 and 18 is a simple cylindrical surface. Such a clutch outer ring 17 is also formed into a cylindrical shape as a whole by subjecting a steel plate such as carburized steel to plastic processing such as press working, and inward flange-shaped flange portions 19a and 19b are formed at both axial end portions. ing.

  The plurality of rollers 18 and 18 are held by a synthetic resin clutch retainer 20 that is externally fitted so as not to rotate with respect to the clutch inner ring 14, and roll on the clutch inner ring 14 and extend in the circumferential direction. It is supported so as to be slightly displaceable. A spring (not shown) such as a leaf spring or a synthetic resin spring integrated with the clutch retainer 20 is provided between the column provided on the clutch retainer 20 and the rollers 18 and 18. These rollers 18 and 18 are elastically pressed in the same direction with respect to the circumferential direction. Since the basic structure and operation of such a roller clutch 10 are well known in the art, further detailed illustration and description thereof will be omitted.

  When the pulley device with a built-in one-way clutch is assembled, the clutch inner ring 14 of the roller clutch 10 is externally fitted to the outer peripheral surface of the sleeve 8 so that the roller clutch 10 is disposed at the intermediate portion in the axial direction of the sleeve 8 and the driven pulley 7a. At the same time, the clutch outer ring 17 is fitted into the inner peripheral surface of the driven pulley 7a. Also, the pair of support bearings 9 and 9 are fitted into the outer rings 29 and 29 at both ends of the inner peripheral surface of the driven pulley 7 a and the inner rings 23 and 23 are fitted into both ends of the outer peripheral surface of the sleeve 8. By doing so, it arrange | positions between the outer peripheral surface both ends of the sleeve 8, and the inner peripheral surface both ends of the driven pulley 7a. Further, after the pair of support bearings 9 and 9 are disposed between both ends of the outer peripheral surface of the sleeve 8 and both ends of the inner peripheral surface of the driven pulley 7a, the sleeve 8 extends from the outside of the right support bearing 9 in FIG. The right end portion 8a of the support bearing 9 is swaged to the inner ring 23 side of the support bearing 9 by swing caulking, and the inner ring 23 is fixed to the sleeve 8. Here, the internal gap is managed to an appropriate value by grasping in advance the relationship between the amount of crimping and the preload. Therefore, by this caulking process, a reliable preload is applied to the left and right support bearings 9, the internal gap is set to 0 or minus, and the roller clutch 10 is prevented from being engaged in an eccentric state. Can work correctly.

  In the pulley device with a built-in one-way clutch configured as described above, the rotation speed of the driven pulley 7a over which the endless belt is stretched is the rotation speed of the sleeve 8 fixed to the rotation shaft of the alternator 1 by the action of the roller clutch 10. Only in the above case, torque is transmitted from the driven pulley 7a to the rotating shaft. Further, when the rotational speed of the driven pulley 7a is lower than the rotational speed of the sleeve 8, the connection between the driven pulley 7a and the sleeve 8 is disconnected so that no extra (braking direction) force is applied to the endless belt. This prevents the endless belt life from decreasing.

  Here, in the present embodiment, the pair of support bearings 9 and 9 are preliminarily given with preload by caulking a part of the sleeve 8, so that the internal clearance is set to 0 or minus, and the roller clutch 10 is Engagement in an eccentric state can be prevented, and the durability of the pulley apparatus with a built-in one-way clutch can be improved and the occurrence of malfunction can be prevented at low cost.

(Second Embodiment)
Next, a pulley apparatus with a built-in one-way clutch according to a second embodiment of the present invention will be described with reference to FIG. The pulley device with a built-in one-way clutch according to the present embodiment integrally forms the outer rings 29 and 29 of the left and right support bearings 9 and 9 with the driven pulley 7a. Since the inner ring 23 of the left support bearing 9 is formed integrally with the sleeve 8 and the other configuration is the same as that of FIG. 1, the same members are denoted by the same reference numerals, and redundant description is omitted. To do.

  Also in the structure of this embodiment, after the pair of support bearings 9 and 9 and the roller clutch 10 are attached, the right end portion 8a of the sleeve 8 is caulked by swing caulking from the outside of the right support bearing 9 in FIG. The inner ring 23 is fixed to the sleeve 8 by machining. By this caulking process, preload is applied to the left and right support bearings 9 and the internal gap is set to 0 or minus to prevent the roller clutch 10 from engaging in an eccentric state. By functioning, the durability is improved and the occurrence of malfunctions is prevented. Further, the outer rings 29 and 29 of the pair of support bearings 9 and 9 are formed integrally with the driven pulley 7a, respectively, and the inner ring 23 of the one support bearing 9 is formed integrally with the sleeve 8, so The cost can be reduced.

  The present invention is not limited to the above-described embodiments, and modifications, improvements, etc. can be made as appropriate.

  In this embodiment, the pulley device with a built-in one-way roller clutch for the alternator mounted between the rotating shaft of the alternator and the driven pulley has been described. However, the one-way roller clutch for the starter mounted between the pulley of the starter and the rotating shaft is built-in. It may be a mold pulley device. In this case, only when the outer peripheral surface of the clutch inner ring is a cylindrical surface and the cam surface is formed on the inner peripheral surface of the clutch outer ring, and the sleeve tends to rotate relative to the pulley in a predetermined direction, the sleeve and the pulley Rotational force can be transmitted between the two.

It is sectional drawing which shows 1st Embodiment of the pulley apparatus with a built-in one-way clutch which concerns on this invention. It is sectional drawing which shows 2nd Embodiment of the pulley apparatus with a one-way clutch which concerns on this invention. It is sectional drawing which shows an example of the conventional alternator.

Explanation of symbols

7a Driven pulley 8 Sleeve 8a Right end (caulking part)
9 Support bearing 10 Roller clutch (one-way clutch)
14 Clutch inner ring 17 Clutch outer ring 18 Roller (engagement element)
20 Clutch retainer 21 Outer ring raceway surface 22 Inner ring raceway surface 23 Inner ring 24 Ball (rolling element)
29 Outer ring

Claims (4)

Sleeve,
A pulley disposed concentrically with the sleeve around the sleeve;
Provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and only between the pulley and the sleeve only when one of the pulley and the sleeve tends to rotate relative to the other in a predetermined direction. A one-way clutch that allows free transmission of rotational force
A support bearing provided between an outer peripheral surface of the sleeve and an inner peripheral surface of the pulley, which supports a radial load applied to the pulley and allows relative rotation between the sleeve and the driven pulley; A pulley device with a built-in one-way clutch,
The one-way clutch built-in type pulley apparatus, wherein the support bearing is preloaded by caulking a part of the sleeve.   The support bearing includes an inner ring, an outer ring, and rolling elements provided between the inner ring and the outer ring, and the outer ring of the support bearing is formed integrally with the pulley, and the inner ring of the support bearing The one-way clutch built-in pulley apparatus according to claim 1, wherein the pulley apparatus is integrated with the sleeve.   The one-way clutch built-in pulley apparatus according to claim 1, wherein the support bearing is an angular ball bearing.   The one-way clutch built-in pulley apparatus according to any one of claims 1 to 3, wherein the sleeve is swaged.

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