JP2007064348A - One-way clutch and clutch-incorporated pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch which can surely prevent axial movement of a cage. <P>SOLUTION: An inner ring 12 is mounted in an outer ring 11 having a cylindrical inner face 13 and a plurality of cam surfaces 17 are formed in an outer periphery of the inner ring 12. An engagement surface 19 to engage with the cam surfaces 17 are provided in an inner periphery of the cage 18 fitted on the outer side of the inner ring 12 from an axial one end side of the inner ring 12. A pocket 21 is formed in the cage 18 so as to face each cam surface 17. An engagement element 22 and an elastic member 23 for biasing the engagement element 22 in a direction such that the engagement element 22 engages with the cylindrical inner face 13 and the cam surface 17, are installed in the pocket 21. An inwardly-extending flange 20 is formed at one end portion of the cage 18, and a projection 25 is formed on an inner peripheral surface of the flange 20. The projection 25 is engaged with an engagement groove 24 formed in a flange fitting surface 15b of the inner ring 12 to thereby position the cage 18 in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a one-way clutch for transmitting a rotational torque in one direction of a drive shaft to a driven shaft and a pulley with a built-in clutch.

  In general, in an accessory drive device that transmits the rotation of the crankshaft of the engine to the rotation shaft of the engine accessory by a belt transmission, when the engine is decelerated suddenly, a pulley attached to the rotation shaft of the engine accessory is also included. Try to slow down as well. At this time, if the engine accessory is an alternator, the rotating shaft of the alternator has a large inertial force, so even if the engine is suddenly decelerated, the rotating shaft is not suddenly decelerated, and a pulley mounted on the rotating shaft Tries to keep turning at a constant speed.

  In this case, a large rotational speed difference is generated between the pulley on the crankshaft and the pulley on the rotating shaft of the alternator, and the belt tension increases and the belt is easily damaged.

  Further, the crankshaft changes its angular velocity during one rotation, and slippage occurs between the pulley and the belt due to the fluctuation of the angular velocity, and the belt wears due to the slipping, and durability is lowered.

  In order to eliminate such inconvenience, a one-way clutch is built in between the rotating shaft of the alternator and the pulley provided on the rotating shaft, and when the rotating speed of the rotating shaft of the alternator exceeds the rotating speed of the pulley, A belt transmission device has been proposed in which the coupling between the pulley and the rotating shaft is released by a one-way clutch, the rotation transmission from the pulley to the rotating shaft is cut off, and the pulley is rotated freely.

  As a one-way clutch employed in the belt transmission, the one described in Patent Document 1 is conventionally known.

  7 and 8 show the one-way clutch described in Patent Document 1. In this one-way clutch, a cylindrical inner surface 52 is formed on an outer ring 51 that is press-fitted into an inner diameter surface of a pulley 50, and a wedge-like shape is formed between the outer surface of an inner ring 53 incorporated inside the outer ring 51 and the cylindrical inner surface 52. A plurality of cam surfaces 54 forming a space are provided, and a cage 55 is fitted to the outside of the inner ring 53 from one end in the axial direction of the inner ring 53, and the engagement surface 56 and cam formed on the inner periphery of the cage 55 Due to the engagement of the surface 54, the retainer 55 is prevented from rotating with respect to the inner ring 53, and the flange 57 formed inward from the rear end in the insertion direction of the retainer 55 and the end surface of the inner ring 53 on the retainer receiving side abut. Thus, the cage 55 is positioned in the axial direction.

A pocket 58 is formed in the retainer 55 at a position facing each cam surface 54 of the inner ring 53, and a roller 59 and the roller 59 are urged toward the narrow portion of the wedge-shaped space in the pocket 58. An elastic member (not shown) is incorporated, and when the outer ring 51 rotates in one direction, the roller 59 is engaged with the cylindrical inner surface 52 and the cam surface 54 to transmit the rotation of the outer ring 51 to the inner ring 53.
JP 2001-3961 A

  By the way, in the conventional one-way clutch, a pair of bearings 60 and 61 for sandwiching the outer ring 51 between both sides of the outer ring 51 and relatively rotatably supporting the pulley 50 and the inner ring 53 are incorporated. Since the inner ring 60a of the bearing 60 and the shoulder 53a of the inner ring 53 of the one-way clutch squeeze the flange 57 of the retainer 55 to prevent the retainer 55 from moving in the axial direction, 8, a gap 62 may be formed between the opposed surfaces of the bearing inner ring 60a and the flange 57, as shown in FIG.

  Here, if a gap 62 is formed between the opposed surfaces of the bearing inner ring 60a and the flange 57, the cage 55 and the roller 59 are displaced in the axial direction when the one-way clutch is engaged, and the engagement of the roller 59 is incomplete. There is a possibility that engagement failure occurs, or that the retainer 55 and the roller 59 vibrate in the axial direction during the idling of the one-way clutch and abnormal noise is generated.

  An object of the present invention is to provide a one-way clutch and a pulley with a built-in clutch that can prevent the cage from moving in the axial direction.

  In order to solve the above problems, in the one-way clutch according to the first invention, an inner ring is incorporated in an outer ring having a cylindrical inner surface, and a wedge-shaped space is formed between the outer surface of the inner ring and the cylindrical inner surface of the outer ring. A plurality of cam surfaces forming a circumferential direction, and a retainer fitted to the outer periphery of the inner ring from one axial end of the inner ring is engaged with the cam surface to prevent the retainer from rotating. And a flange facing the end face of the inner ring on the cage receiving side, and a pocket is formed in the cage at a position facing each of the cam surfaces, and an engagement element and the engagement element are wedged in each pocket. In a one-way clutch that incorporates an elastic member that urges toward a narrow portion of the shape space, the cage is a synthetic resin molded product, and is placed on one of the opposing surfaces of the flange inner periphery and inner ring outer periphery. An engaging groove extending in the circumferential direction is formed on the other side. Than is adopted the structure in which a protruding portion engaged with the engagement groove of the.

  In the one-way clutch according to the first aspect of the present invention, when a stealth that makes the portion corresponding to the protruding portion thin on the inner peripheral portion of one surface of the flange is formed, the inner diameter portion of the flange is easily elastically deformed in the radial direction, The protrusion can be easily engaged with the engaging groove.

  In the one-way clutch according to the second invention, an inner ring having a cylindrical outer surface is incorporated inside the outer ring, and a plurality of cams forming a wedge-shaped space between the inner ring and the cylindrical outer surface of the inner ring A cage is provided in a circumferential direction, and is fitted into the outer ring from one axial end of the outer ring. An engagement surface that engages with the cam surface to prevent the cage from rotating, and an outer ring cage. A flange facing the end surface on the receiving side is provided, and a pocket is formed in the retainer at a position facing each cam surface, and an engagement element is formed in each pocket, and the engagement element is formed in a narrow portion of the wedge-shaped space. In a one-way clutch that incorporates an elastic member that urges toward the end, the retainer is a synthetic resin molded product, and the engagement extends in the circumferential direction to one of the opposing surfaces of the outer periphery of the flange and the inner periphery of the outer ring. A protrusion that forms a groove and engages the engaging groove on the other side The than is adopted the configuration provided.

  In the one-way clutch according to the second aspect of the present invention, when the stealth that makes the portion corresponding to the protruding portion thin on the outer peripheral portion of one surface of the flange is formed, the outer diameter portion of the flange is easily elastically deformed in the radial direction, The protrusion can be easily engaged with the engaging groove.

  In the one-way clutch according to the first invention and the one-way clutch according to the second invention, when a radial interference is provided between the engagement groove and the protrusion, the protrusion is firmly engaged with the engagement groove. Therefore, it is possible to more reliably prevent the cage from moving in the axial direction.

  In the pulley with a built-in clutch according to the third invention, the one-way clutch according to the first invention or the outer ring of the one-way clutch according to the second invention is press-fitted into the inner diameter surface of the pulley, and the pulley and the inner ring are placed on both sides of the outer ring. The structure which provided a pair of bearing which supports these relatively rotatably was employ | adopted.

  As in the first aspect of the invention, an engagement groove is formed on one of the opposing surfaces of the inner periphery and the outer periphery of the flange formed on the cage, and a protrusion that engages with the engagement groove is provided on the other. As a result, the cage can be prevented from moving in the axial direction.

  Further, as in the second aspect of the invention, an engagement groove is formed on one of the opposing surfaces of the outer periphery of the flange formed on the cage and the inner periphery of the outer ring, and a protrusion that engages with the engagement groove is provided on the other. As a result, the cage can be prevented from moving in the axial direction.

  Therefore, in both the first and second aspects of the invention, the engagement element can be reliably engaged with the narrow portion of the wedge-shaped space when the one-way clutch is engaged, The cage and the engagement element do not vibrate in the axial direction during idling, and the generation of abnormal noise can be prevented.

  Further, as in the third invention, the pulley and the one-way clutch can be assembled at the same time by press-fitting the outer ring of the one-way clutch inside the pulley and unitizing the pulley and the one-way clutch. Therefore, when the rotation speed of the auxiliary machine exceeds the rotation speed of the engine, it is possible to facilitate the assembly of the belt transmission device that cuts off the power transmission from the engine to the auxiliary machine.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 show a pulley with a built-in clutch. This pulley with a built-in clutch has a pulley 1 and a one-way clutch 10 incorporated therein, and a plurality of V grooves 2 for guiding a V-ribbed belt are formed on the outer periphery of the pulley 1.

  The one-way clutch 10 has an outer ring 11 and an inner ring 12 incorporated inside the outer ring 11, and the outer ring 11 is press-fitted into the inner diameter surface of the pulley 1 and rotates together with the pulley 1. A cylindrical inner surface 13 is formed on the outer ring 11.

  The inner ring 12 has a configuration in which a pair of small diameter cylindrical portions 15 are provided at both ends of the cam ring portion 14. A bearing fitting surface 15 a is provided on the outer periphery of each small diameter cylindrical portion 15, and one small diameter cylindrical portion 15 is fitted with a flange having a larger diameter than the bearing fitting surface 15 a between the bearing fitting surface 15 a and the cam ring portion 14. A mating surface 15b is formed.

  A bearing 16 is fitted to each of the bearing fitting surfaces 15a, the outer ring 11 is sandwiched by the bearing 16 and positioned in the axial direction, and the inner ring 12 and the pulley 1 are relatively rotatable.

  As shown in FIGS. 1 and 2, a plurality of cam surfaces 17 that form a wedge-shaped space with the cylindrical inner surface 13 of the outer ring 11 are provided at equal intervals in the circumferential direction on the outer periphery of the cam ring portion 14. Yes.

  A cage 18 is incorporated between the outer ring 11 and the inner ring 12. The cage 18 is made of a synthetic resin molded product. A plurality of engagement surfaces 19 that engage with the cam surface 17 of the inner ring 12 are provided on the inner periphery of the retainer 18, and the retainer 18 is attached to the inner ring 12 by the engagement of the engagement surface 19 and the cam surface 17. It has been stopped.

  The cage 18 is fitted to the outer periphery of the cam ring portion 14 from one end side in the axial direction of the inner ring 12, and an inward flange 20 is formed at an end portion which becomes the rear side at the time of the fitting.

  A pocket 21 is formed in the retainer 18 so as to face each cam surface 17 of the inner ring 12. An engagement element 22 made of a roller is provided in each pocket 21, and the engagement element 22 is attached to a narrow portion of the wedge-shaped space. A resilient elastic member 23 is incorporated.

  As shown in FIG. 3, the flange 20 is fitted to the flange fitting surface 15b. An engaging groove 24 extending in the circumferential direction is formed on the flange fitting surface 15 b, while a protruding portion 25 that engages with the engaging groove 24 is provided on the inner diameter surface of the flange 20.

  Here, the engagement groove 24 and the protruding portion 25 may be an engagement that fits snugly, or may be an engagement having an interference δ in the radial direction as shown in FIG. The cage 18 is positioned in the axial direction by the engagement.

  Further, the protruding portion 25 may be continuous in the circumferential direction, or may be discontinuous in the circumferential direction. Further, it may be a protrusion.

  On the inner peripheral portion of the outer surface of the flange 20, a stealing 26 is provided to make the portion corresponding to the protruding portion 25 thin. The stealing 26 is intended to facilitate elastic deformation of the inner diameter portion of the flange 20 to facilitate the engagement of the protruding portion 25 with the engaging groove 24, and has an appropriate shape according to the shape of the protruding portion 25. Try to pick.

  For example, when the protruding portion 25 is continuous in the circumferential direction, the stealing 26 is an annular groove, and when the protruding portion 25 is discontinuous in the circumferential direction or formed of a protrusion, an arcuate groove or notch To do. In the stealing 26 composed of an arcuate groove or a notch, it is provided at a position corresponding to the protrusion 25.

  In the example shown in FIG. 3, the protrusion 25 is provided on the inner diameter surface of the flange 20 and the engagement groove 24 is formed on the flange fitting surface 15b. A groove may be formed and a protrusion may be provided on the flange fitting surface 15b.

  The pulley with a built-in clutch shown in the embodiment has the above structure, and when the pulley 1 rotates in the direction indicated by the arrow in FIG. 2, the engagement element 22 engages with the cylindrical inner surface 13 of the outer ring 11 and the cam surface 17 of the inner ring 12. Then, the rotation of the pulley 1 is transmitted to the inner ring 12 through the engagement element 22.

  When the rotation speed of the inner ring 12 exceeds the rotation speed of the pulley 1, the engagement of the engagement element 22 with the cylindrical inner surface 13 and the cam surface 17 is released, and the rotation transmission from the pulley 1 to the inner ring 12 is interrupted.

  For this reason, when the inner ring 12 of the pulley with built-in clutch is attached to the rotating shaft of the alternator, and the belt is passed between the pulley 1 of the pulley with built-in clutch and the pulley attached to the crankshaft, the alternator is driven by sudden deceleration of the engine. The pulley 1 can be freely rotated when the rotational speed of the crankshaft exceeds the rotational speed of the crankshaft. Therefore, it is possible to prevent slippage at the contact portion between the pulley 1 and the belt or increase in the belt tension, and it is possible to prevent the belt from being damaged.

  Here, as shown in FIG. 4, the retainer 18 is assembled to the inner ring 12 by disposing the retainer 18 on one end side in the axial direction of the inner ring 12, and the engagement surface 19 of the retainer 18 and the cam of the inner ring 12. After aligning with the surface 17, the cage 18 is fitted to the outer periphery of the cam ring portion 14.

  When the fitting amount of the cage 18 with respect to the cam ring portion 14 increases, the flange 20 of the cage 18 starts to be fitted to the flange fitting surface 15b, and the protruding portion 25 provided on the inner diameter surface thereof becomes the flange fitting surface 15b. When it begins to contact, the inner diameter portion of the flange 20 is elastically deformed.

  At this time, since the stealing 26 is provided on the inner peripheral portion of the outer surface of the flange 20, the inner diameter portion of the flange 20 is easily elastically deformed radially outward.

  When the retainer 18 is fitted to the position where the protrusion 25 faces the engagement groove 24, the protrusion 25 is engaged with the engagement groove 24, and the retainer 18 is positioned in the axial direction by the engagement. . In this case, by providing a radial interference δ between the engagement groove 24 and the protrusion 25 as shown in FIG. 4, the engagement force of the protrusion 25 with respect to the engagement groove 24 is strong, The cage 18 can be more reliably positioned in the axial direction.

  Thus, since the retainer 18 is positioned in the axial direction by the engagement of the engagement groove 24 and the protrusion 25, the retainer 18 and the engagement element 22 move in the axial direction when the one-way clutch is engaged. There is nothing. For this reason, the engagement element 22 can be surely engaged with the narrow part of the wedge-shaped space formed by the cylindrical inner surface 13 and the cam surface 17, and the occurrence of poor engagement in the one-way clutch can be prevented. be able to.

  Further, when the one-way clutch is idling, the cage 18 and the engagement element 22 do not vibrate in the axial direction, and the generation of abnormal noise can be prevented.

  5 and 6 show another embodiment of the pulley with a built-in clutch. The configuration of the one-way clutch 10 is different from this embodiment and the pulley with built-in clutch of the embodiment shown in FIGS. 1 and 2.

  In the one-way clutch 10 shown in FIG. 6, a cylindrical outer surface 33 is formed on an inner ring 32 incorporated inside the outer ring 31, and a wedge-shaped space is formed between the outer ring 31 and the cylindrical outer surface 33. A plurality of cam surfaces 34 are provided at equal intervals in the circumferential direction, and a retainer 35 having an engagement surface 36 that engages with the cam surfaces 34 is fitted in the outer ring 31. A pocket 37 is provided at a position facing the cam surface 34, and an engaging member 38 made of a roller and an elastic member 39 for urging the engaging member 38 toward a narrow portion of the wedge-shaped space are incorporated in each pocket 37. It is out.

  Further, a flange fitting surface 40 is formed on the inner periphery of one end of the outer ring 31, and an outward flange 41 that is fitted to the flange fitting surface 40 is provided on the retainer 35. A joint groove 42 is formed, a protrusion 43 that engages with the engagement groove 42 is provided on the outer diameter surface of the flange 41, and a steal 44 is formed on the outer peripheral portion of the outer surface of the flange 41.

  As described above, the engaging groove 42 is formed in the flange fitting surface 40, and the protrusion 35 provided on the outer diameter surface of the flange 41 is engaged with the engaging groove 42, whereby the cage 35 is axially moved. 1 and 2, as well as the one-way clutch shown in FIGS. 1 and 2, it is possible to prevent the occurrence of poor engagement and to prevent the generation of abnormal noise during idling. it can.

  Further, since the steal 44 is formed on the outer peripheral portion of the outer surface of the flange 41, the outer diameter portion of the flange 41 is easily elastically deformed, and the protrusion 43 can be easily engaged with the engagement groove 42.

  In the example shown in FIG. 6, if a radial interference is provided between the engagement groove 42 and the protrusion 43 as in the case shown in FIG. 4, the cage 35 is more reliably positioned in the axial direction. can do.

  In the example shown in FIG. 6, the engaging groove 42 is formed on the flange fitting surface 40 and the protruding portion 43 is provided on the outer diameter surface of the flange 41, but the protruding portion is provided on the flange fitting surface 40, An engagement groove may be formed on the outer diameter surface.

A longitudinal front view showing an embodiment of a pulley with a built-in clutch according to the present invention Sectional view along the line II-II in FIG. Sectional drawing which expands and shows the axial direction positioning part of the holder | retainer shown in FIG. Sectional drawing which shows the state before the assembly | attachment of a cage Sectional drawing which shows other embodiment of the pulley with a built-in clutch which concerns on this invention Sectional drawing which expands and shows the axial positioning part of the cage | basket shown in FIG. Sectional view showing a conventional pulley with built-in clutch Sectional drawing which expands and shows the positioning part of the axial direction of the holder | retainer shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulley 10 One-way clutch 11 Outer ring 12 Inner ring 13 Cylindrical inner surface 17 Cam surface 18 Cage 19 Engagement surface 20 Flange 21 Pocket 22 Engagement member 23 Elastic member 24 Engagement groove 25 Projection part 26 Stealing 31 Outer ring 32 Inner ring 33 Cylindrical type Outer surface 34 Cam surface 35 Cage 36 Engagement surface 37 Pocket 38 Engagement element 39 Elastic member 41 Flange 42 Engagement groove 43 Projection 44 Stealing

Claims (6)

An inner ring is incorporated into an outer ring having a cylindrical inner surface, and a plurality of cam surfaces are formed in the circumferential direction on the outer periphery of the inner ring to form a wedge-shaped space with the cylindrical inner surface of the outer ring. The retainer fitted to the outer periphery of the inner ring is provided with an engagement surface that engages with the cam surface and prevents the retainer from rotating, and a flange that faces the end surface of the inner ring on the retainer receiving side. The container has a pocket formed at a position facing each of the cam surfaces, and an engagement member and an elastic member that urges the engagement member toward the narrow portion of the wedge-shaped space in each pocket. In the clutch,
The retainer is a synthetic resin molded product, and an engagement groove extending in the circumferential direction is formed on one of the opposing surfaces of the inner periphery of the flange and the outer periphery of the inner ring, and the protrusion is engaged with the engagement groove on the other. The one-way clutch characterized by providing.   2. The one-way clutch according to claim 1, wherein a portion of the flange corresponding to the protruding portion is formed with a thin thickness on one inner peripheral portion of the flange. An inner ring having a cylindrical outer surface is incorporated inside the outer ring, and a plurality of cam surfaces forming a wedge-shaped space between the inner ring and the cylindrical outer surface of the inner ring are provided in the circumferential direction, and the axial direction of the outer ring The retainer fitted into the outer ring from one end is provided with an engagement surface that engages with the cam surface and prevents the retainer from rotating, and a flange that faces the end surface of the outer ring on the cage receiving side, The cage is formed with a pocket at a position facing each cam surface, and an engaging member and an elastic member for urging the engaging member toward the narrow portion of the wedge-shaped space are incorporated in each pocket. In the one-way clutch,
The retainer is a synthetic resin molded product, and an engaging groove extending in the circumferential direction is formed on one of the opposing surfaces of the outer periphery of the flange and the inner periphery of the outer ring, and the protrusion is engaged with the engaging groove on the other. The one-way clutch characterized by providing.   The one-way clutch according to claim 3, wherein a portion of the flange corresponding to the protrusion is formed on the outer peripheral portion of one side of the flange so as to have a thin thickness.   The one-way clutch according to claim 1, wherein a radial interference is provided between the engagement groove and the protrusion.   A built-in clutch in which the outer ring of the one-way clutch according to any one of claims 1 to 5 is press-fitted into an inner diameter surface of the pulley, and a pair of bearings that rotatably support the pulley and the inner ring are provided on both sides of the outer ring. Pulley.

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