JP5866169B2 - Rotation transmission device - Google Patents

Description

  The present invention relates to a rotation transmission device capable of switching between rotation transmission and cutoff.

  2. Description of the Related Art Conventionally, a rotation transmission device that transmits and blocks rotation from a drive shaft to a driven shaft has a two-way clutch, and the engagement and release of the two-way clutch are controlled by an electromagnetic clutch. It has been.

  In the rotation transmission device described in Patent Document 1, a control cage and a rotation cage are alternately arranged between an outer ring and an inner ring incorporated therein, and pillar portions formed in each cage are alternately arranged in the circumferential direction. Assemble the pair of rollers in a pocket formed between adjacent column parts, and urge the pair of rollers in a direction away from each other by an elastic member incorporated between the opposed parts. The roller is put on standby at a position where it engages with the cylindrical surface formed on the inner periphery of the outer ring and the cam surface formed on the outer periphery of the inner ring, and one roller is engaged with the cylindrical surface and the cam surface by rotating the inner ring in one direction. The rotation of the inner ring is transmitted to the outer ring.

  Further, an electromagnetic clutch is provided on the input shaft connected to the inner ring, and the control cage is moved in the axial direction by the electromagnetic clutch, and is provided between the opposing surfaces of the flange of the control cage and the rotary cage. The control retainer and the rotational retainer are relatively rotated in the direction in which the circumferential width of the pocket is reduced by the action of the torque cam, and the pair of rollers are moved to the disengagement position by the pillar portion of each retainer. The rotation transmission to is cut off.

  In the rotation transmission device, when the control cage is moved in a direction in which the flange of the control cage is separated from the flange of the rotation cage by the electromagnetic clutch, the rotation is controlled by the pressing action of the elastic member incorporated between the pair of opposed rollers. The cage and rotating cage rotate relative to each other in the direction of increasing the circumferential width of the pocket, and the pair of opposed rollers immediately engage the cylindrical surface and cam surface. It has the feature of being.

JP 2009-293679 A

  By the way, in the rotation transmission device described in the above-mentioned Patent Document 1, since the entire control cage and the rotation cage are accommodated in the outer ring, an outer ring having a long axial length is required and the weight is also increased. However, there are still points to be improved in reducing the weight.

  Here, in the rotation transmission device, nothing is mentioned about the material of the input shaft, but it is generally formed of a magnetic metal in consideration of durability. At this time, when the armature is attracted to the rotor by energizing the electromagnet, the magnetic flux leaks to the input shaft, the magnetic attracting force is reduced, and the two-way clutch cannot be accurately controlled. In order to solve such a problem, it is necessary to employ a large electromagnet, and there is still a point to be improved when the rotation transmission device is increased in size and reduced in size.

  An object of the present invention is to reduce the weight of the rotation transmission device by reducing the axial length of the outer ring, and to prevent leakage of magnetic flux and use a small electromagnet.

In order to solve the above-described problems, in the present invention, a cylindrical surface is formed on one of the inner periphery of the outer ring and the outer periphery of the inner ring incorporated on the inner side thereof, and on the other end in the circumferential direction between the cylindrical surface. A plurality of cam surfaces that form a narrow wedge space are provided at intervals in the circumferential direction, and a pair of rollers facing each of the wedge spaces formed between the plurality of cam surfaces and the cylindrical surface, And an elastic member that urges the roller in a direction away from the roller. Each of the pair of opposed rollers is held by a cage, and the cage is composed of a control cage and a rotary cage. Has a structure in which a plurality of pillars are formed at intervals in the circumferential direction on the outer peripheral part of the annular flange, and the two cages are arranged so that the flanges face each other in the axial direction and the pillars are alternately arranged in the circumferential direction. Is a combination that will be adjacent A pocket for accommodating the pair of opposed rollers and the elastic member is formed between the portions, and the gap between the opposed flanges is reduced between the opposed surfaces of the flange of the control cage and the flange of the rotary cage. A torque cam is provided to relatively rotate the pair of cages in the direction in which the circumferential width of the pocket is reduced by the movement of the control cage, and the control cage is moved in the axial direction on the input shaft having the inner ring at the shaft end. And an armature that is supported so as to be movable in the axial direction of the input shaft, and is opposed to the armature in the axial direction, and is axially formed by a step provided on the outer periphery of the input shaft. It consists of a positioned rotor and an electromagnet that faces the rotor in the axial direction and attracts the armature to the rotor when energized. In the rotation transmission device in which the control retainer is moved in the axial direction by connecting the control retainer and the rotation retainer, the flange is disposed between the outer ring and the inner ring and the axially opposed flanges of the control retainer and the rotation retainer. Is installed between the opening end face of the outer ring and the armature , and the flange of the control retainer is provided with a cylindrical portion opposite to the column portion, and the connecting cylinder provided on the cylindrical portion and the outer peripheral portion of the armature The armature and the control cage are connected and integrated with each other, and the armature is slidably supported on the outer diameter surface between the rotor and the stepped portion, and the rotation cage is provided on the side facing the rotation cage. The support ring which prevents the movement to the armature side is fitted, and the support ring is made of a non-magnetic material.

  As described above, the control retainer and the rotation retainer are incorporated between the outer ring and the inner ring so that the axially opposing flange is disposed between the outer ring and the armature. The axial length of the outer ring can be reduced in size and weight compared to the case of incorporating the housing.

  Further, by slidably supporting the armature with the support ring made of a non-magnetic material, it is possible to prevent magnetic flux from leaking from the armature to the input shaft when the electromagnet is energized.

  For this reason, a small electromagnet can be adopted, and the rotation transmission device can be downsized.

  Here, leakage of magnetic flux can be more effectively prevented by providing axially extending grooves on the outer diameter surface of the support ring at intervals in the circumferential direction.

  The nonmagnetic material forming the support ring may be a nonmagnetic metal or a synthetic resin. When using synthetic resins, reducing the sliding resistance of the armature by using self-lubricating resins such as polyacetal (POM), polyamide (PA), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), etc. The armature can be moved smoothly in the axial direction.

  In the rotation transmission device according to the present invention, when a thrust roller bearing that rotatably supports the rotation cage is incorporated between the support ring and the rotation cage, the rotation resistance of the rotation cage is reduced and the rotation is reduced. The cage can be smoothly rotated relative to the control cage.

  In this case, as a thrust roller bearing, a non-separable thrust roller having a pair of race rings and a cage for holding the rollers and rollers between the race rings, the pair of race rings being non-separated in the axial direction. When a bearing is employed, assembly can be facilitated.

  Also, if a slide guide surface is provided on the outer periphery of the input shaft to slidably support the inner diameter surface of the flange of the control cage, the armature is slidably supported at two locations, the slide guide surface and the outer diameter surface of the support ring. As a result, the armature can always be held parallel to the rotor.

  For this reason, the magnetic attraction gap formed between the opposing surfaces of the armature and the rotor is uniform in size in the entire circumferential direction, and the armature can be reliably magnetically attracted to the rotor by energizing the electromagnet. Engagement and disengagement can be accurately performed.

  In the present invention, as described above, the control retainer and the rotation retainer are incorporated so that the axially opposed flanges are disposed between the outer ring and the armature, thereby reducing the axial length of the outer ring. Thus, the rotation transmission device can be reduced in weight.

  Further, since the armature is slidably supported by the support ring made of a nonmagnetic material fitted to the input shaft, it is possible to prevent magnetic flux from leaking from the armature to the input shaft. For this reason, a small electromagnetic clutch can be employed, and the rotation transmission device can be miniaturized.

  Furthermore, since there is little decrease in the magnetic attraction force when the rotor attracts the armature, it is possible to reliably control the two-way clutch that switches between transmission of rotation and interruption between the outer ring and the inner ring by the electromagnetic clutch, A highly reliable rotation transmission device can be obtained.

A longitudinal sectional view showing an embodiment of a rotation transmission device according to the present invention Sectional drawing which expands and shows a part of FIG. Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. Sectional view along line VV in FIG. Sectional view along line VI-VI in FIG. (A) is sectional drawing along the VII-VII line of FIG. 6, (b) is sectional drawing which shows an operation state. Sectional drawing which shows the other example of a support ring Sectional drawing which shows another example of a support ring A longitudinal sectional view showing another embodiment of the rotation transmission device according to the present invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a rotation transmission device according to the present invention. As shown in the figure, the rotation transmission device includes a housing 1, a two-way clutch 10 housed in the housing 1, and an electromagnetic clutch 50 that controls engagement and release of the two-way clutch 10.

  The housing 1 has a cylindrical shape, and a small-diameter bearing cylinder 2 is provided at one end thereof. A positioning ring 3 is provided on the inner periphery of the bearing tube 2.

  As shown in FIGS. 1 to 3, the two-way clutch 10 is provided with a cylindrical surface 12 on the inner periphery of the outer ring 11 and a plurality of cam surfaces 14 on the outer periphery of the inner ring 13 incorporated inside the outer ring 11 in the circumferential direction. A pair of rollers 15 is assembled between each of the plurality of cam surfaces 14 and the cylindrical surface 12 and the rollers 15 are held by a retainer 16, and a pair of rollers 15 is rotated by rotating the inner ring 13 in one direction. One of the rollers 15 is engaged with the cylindrical surface 12 and the cam surface 14 to transmit the rotation of the inner ring 13 to the outer ring 11, and when the inner ring 13 is rotated in the other direction, the other roller 15 is moved to the cylindrical surface 12 and the cam surface. 14, the rotation of the inner ring 13 is transmitted to the outer ring 11.

  Here, as shown in FIG. 1, the outer ring 11 has a closed end, and an output shaft 17 is provided at the closed end. The output shaft 17 is inserted into the bearing cylinder 2 of the housing 1, and the end portion is A bearing 4 and an elastic member 5 are installed in the bearing cylinder 2 so as to support the output shaft 17 rotatably.

  The elastic member 5 includes a two-way clutch 10 and an electromagnetic clutch 50 that controls the engagement and release of the two-way clutch 10 on a retaining ring 6 that includes a retaining ring attached to the inner periphery of the other end opening of the housing 1. The electromagnetic clutch 50 is pressed against the retaining ring 6 by energizing the retaining ring 6. For this reason, the built-in component composed of the two-way clutch 10 and the electromagnetic clutch 50 incorporated in the housing 1 is incorporated without rattling.

  Here, a wave spring, a disc spring, or the like can be employed as the elastic member 5.

  As shown in FIG. 1 and FIG. 2, the outer ring 11 has a small-diameter recess 18 formed on the inner surface side of the closed end, and the bearing 13 incorporated in the recess 18 has the inner ring 13 at the shaft end. A metal input shaft 22 is rotatably supported.

  FIG. 1 shows an example in which the inner ring 13 is integrally provided at the shaft end of the input shaft 22, but the inner ring 13 is separated from the input shaft 22 as shown in FIG. The shaft end portion of the input shaft 22 may be fitted inside, and the inner ring 13 and the input shaft 22 may be connected and integrated by serrations 36 formed between the fitting surfaces.

  As shown in FIG. 3, the cam surface 14 formed on the outer periphery of the inner ring 13 is formed of a pair of inclined surfaces 14 a and 14 b that are inclined in opposite directions, and is circumferentially provided between the outer ring 11 and the cylindrical surface 12. Both ends form a narrow wedge-shaped space, and a flat spring support surface 20 facing the tangential direction of the inner ring 13 is provided between the pair of inclined surfaces 14a and 14b. Is supported.

  In FIG. 4, a rectangular coil spring having a circular cross section is shown as the elastic member 21, but the elastic member 21 is not limited to this. As shown in FIG. 3, the elastic member 21 is incorporated between the pair of rollers 15 so as to be supported by the support surface 20, and the pair of rollers 15 is urged away by the elastic member 21. ing.

  As shown in FIGS. 1 and 2, the cage 16 includes a control cage 16A and a rotary cage 16B. As shown in FIGS. 1 and 6, the control retainer 16 </ b> A is provided with the same number of column portions 25 as the cam surface 14 on the outer peripheral portion of one surface of the annular flange 24 at equal intervals in the circumferential direction, and between the adjacent column portions 25. An arc-shaped long hole 26 is formed in the outer periphery, and a cylindrical portion 27 is provided on the outer periphery in a direction opposite to the column portion 25.

  On the other hand, the rotary cage 16B is configured such that the same number of column portions 29 as the cam surface 14 are provided at equal intervals in the circumferential direction on the outer periphery of the annular flange 28.

  The control retainer 16A and the rotation retainer 16B are a combination in which the column portions 29 of the rotation retainer 16B are inserted into the elongated holes 26 of the control retainer 16A, and the column portions 25 and 29 are alternately arranged in the circumferential direction. ing. In the combined state, the end portions of the column portions 25 and 29 are disposed between the outer ring 11 and the inner ring 13, and the flange 24 of the control holder 16 </ b> A and the flange 28 of the rotary holder 16 </ b> B are fitted to the outer periphery of the input shaft 22. Further, it is built in between the support ring 30 and the outer ring 11.

  By incorporating the cages 16A and 16B as described above, as shown in FIG. 3, a pocket 31 is formed between the column portion 25 of the control cage 16A and the column portion 29 of the rotary cage 16B. The pair of rollers 15 and the elastic member 21 are incorporated in each pocket 31 so as to face the 13 cam surfaces 14 in the radial direction.

  As shown in FIG. 2, the flange 24 of the control holder 16A and the flange 28 of the rotary holder 16B are slidably supported along a slide guide surface 32 formed on the outer periphery of the input shaft 22, and the rotary holder 16B. A thrust bearing 33 is incorporated between the flange 28 and the support ring 30 of the input shaft 22.

  The thrust bearing 33 is a thrust roller bearing in which a roller 33c and a cage 33d are incorporated between a pair of raceways 33a and 33b. In order to facilitate the incorporation of the thrust roller bearing 33, a non-separable type in which the pair of race rings 33a, 33b, the roller 33c, and the cage 33d are not separated in the axial direction is used here. .

  As shown in FIGS. 2, 6 and 7B, a torque cam 40 is provided between the flange 24 of the control holder 16A and the flange 28 of the rotary holder 16B. The torque cam 40 is provided with a pair of opposed cam grooves 41 and 42 that gradually become shallower toward the opposite ends of the flange 24 of the control retainer 16A and the flange 28 of the rotation retainer 16B. The ball 43 is incorporated between one end of the cam groove 41 and the other end of the other cam groove 42.

  The cam grooves 41 and 42 are arc-shaped grooves here, but may be V-grooves.

  When the control holder 16A moves in the axial direction in the direction in which the flange 24 of the control holder 16A approaches the flange 28 of the rotary holder 16B, the torque cam 40 has a ball 43 as shown in FIG. Rolls toward the deepest groove depth of the cam grooves 41 and 42, and the control holder 16A and the rotary holder 16B are rotated relative to each other in the direction in which the circumferential width of the pocket 31 is reduced. .

  As shown in FIGS. 4 and 5, a small-diameter cylindrical surface 45 is formed on the other axial side of the cam surface 14 formed on the inner ring 13, and an annular holding plate 46 is fitted to the cylindrical surface 45. It is fixed to the inner ring 13. On the outer peripheral surface of the holding plate 46, a plurality of detent pieces 47 disposed in the respective pockets 31 between the column portion 25 of the control holder 16A and the column portion 29 of the rotary holder 16B are formed.

  When the control retainer 16A and the rotation retainer 16B rotate relative to each other in the direction of reducing the circumferential width of the pocket 31, the plurality of detent pieces 47 are connected to the column portion 25 of the control retainer 16A and the rotation retainer 16B. The column portion 29 is received at both side edges to hold the pair of opposed rollers 15 in a neutral position.

  On the outer periphery of the holding plate 46, spring pressing arms 48 are provided to project to the outer diameter sides of the plurality of elastic members 21, and the elastic pressing members 48 escape to the outer diameter side between the pair of rollers 15 by the spring pressing arms 48. It is prevented from coming out.

  As shown in FIG. 2, the electromagnetic clutch 50 includes an armature 51 that faces the end face of the cylindrical portion 27 formed in the control retainer 16A in the axial direction, a rotor 52 that faces the armature 51 in the axial direction, and the rotor 52 and an electromagnet 53 facing in the axial direction.

  The armature 51 is fitted to the outer periphery of the support ring 30 of the input shaft 22 and is rotatably and slidably supported. The armature 51 is provided in the connecting cylinder 55 provided on the outer periphery of the armature 51. The cylindrical portion 27 is press-fitted, and the control holder 16A and the armature 51 are connected and integrated. With this connection, the armature 51 is slidably supported at two locations in the axial direction of the cylindrical outer diameter surface 54 of the support ring 30 and the slide guide surface 32 on the outer periphery of the input shaft 22.

  The rotor 52 is press-fitted into the input shaft 22, and a shim 56 is provided between the rotor 52 and the support ring 30 provided on the outer periphery of the input shaft 22.

  Here, the support ring 30 is positioned in the axial direction by a step portion 34 formed on the other side in the axial direction of the slide guide surface 32 of the input shaft 22, and a shim 56 is interposed between the support ring 30 and the rotor 52. By incorporating the rotor 52, the rotor 52 is positioned in the axial direction.

  The support ring 30 is made of a nonmagnetic material. The nonmagnetic material may be a nonmagnetic metal or a synthetic resin. By adopting a self-lubricating resin such as polyacetal (POM), polyamide (PA), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS) as a synthetic resin, the sliding resistance of the armature 51 is reduced. The armature 51 can be moved smoothly in the axial direction.

  As shown in FIGS. 1 and 2, the electromagnet 53 includes an electromagnetic coil 53a and a core 53b that supports the electromagnetic coil 53a, and a cylindrical portion 57 is formed on the outer end surface of the core 53b. The bearing 58 incorporated in the cylinder 57 is prevented from coming out of the cylinder part 57 by a retaining ring 59 attached to the inner periphery of the cylinder part 57. The bearing 58 is positioned in the axial direction by a step portion 60 formed on the outer diameter surface of the input shaft 22 and the retaining ring 59, and the electromagnet 53 and the input shaft 22 are relatively rotatable by the bearing 58. ing.

  The core 53b is incorporated in the other end portion of the housing 1, and is attached in the opening of the other end portion of the housing 1 by the elastic force of the elastic member 5 incorporated in the bearing tube 2. It is pressed against the retaining ring 6 and secured.

  The rotation transmission device shown in the embodiment has the above-described structure, and FIG. 1 shows a cut-off state of the electromagnet 53 with respect to the electromagnetic coil 53a, and the armature 51 is separated from the rotor 52. Further, as shown in FIG. 3, the pair of opposed rollers 15 of the two-way clutch 10 are positioned at a standby position that engages with the cylindrical surface 12 of the outer ring 11 and the cam surface 14 of the inner ring 13. In FIG. 1, the armature 51 and the rotor 52 are shown in close contact with each other, but there is actually a gap between them.

  When the electromagnetic coil 53 a is energized in the standby state of the two-way clutch 10, an attractive force acts on the armature 51, and the armature 51 moves in the axial direction and is attracted to the rotor 52.

  Here, since the armature 51 is connected and integrated with the control holder 16A, the flange 24 of the control holder 16A approaches the flange 28 of the rotary holder 16B as the armature 51 moves in the axial direction. Move in the direction.

  At this time, as shown in FIG. 7 (a), the ball 43 shown in FIG. 7 (b) rolls and moves toward the deepest groove depth of the cam grooves 41, 42, and rotates and holds the control holder 16A. The vessel 16B relatively rotates in the direction in which the circumferential width of the pocket 31 decreases.

  In this case, since the rotation cage 16B is rotatably supported by the thrust bearing 33, the control cage 16A and the rotation cage 16B smoothly rotate relative to each other. The roller 15 is pushed by the column portion 25 of the control holder 16A and the column portion 29 of the rotary holder 16B and moves in a direction approaching each other.

  For this reason, the roller 15 is disengaged from the cylindrical surface 12 and the cam surface 14 to become a neutral state, and the two-way clutch 10 is disengaged.

  In the disengaged state of the two-way clutch 10, when rotational torque is input to the input shaft 22 and the inner ring 13 is rotated in one direction, the detent piece 47 formed on the holding plate 46 becomes the column portion 25 of the control cage 16 </ b> A. In order to press one of the column portions 29 of the rotary cage 16B, the control cage 16A and the rotary cage 16B rotate together with the inner ring 13. At this time, since the pair of opposed rollers 15 is held in the neutral position where the engagement is released, the rotation of the inner ring 13 is not transmitted to the outer ring 11 and the inner ring 13 rotates freely.

  Here, when the control holder 16A and the rotary holder 16B are relatively rotated in a direction to reduce the circumferential width of the pocket 31, the column part 25 of the control holder 16A and the column part 29 of the rotary holder 16B are The amount of relative rotation is regulated by coming into contact with both side edges of the rotation stopper piece 47.

  For this reason, the elastic member 21 will not shrink more than necessary, and even if it is repeatedly expanded and contracted, it will not be damaged by fatigue.

  When the energization of the electromagnetic coil 53a is released in the free rotation state of the inner ring 13, the armature 51 is released from the suction and becomes rotatable. By releasing the suction, the control holder 16A and the rotary holder 16B are relatively rotated by the pressing of the elastic member 21 in the direction in which the circumferential width of the pocket 31 is increased, and each of the pair of opposed rollers 15 is as shown in FIG. In addition, a standby state is established in which the cylindrical surface 12 and the cam surface 14 are engaged, and a unidirectional rotational torque is transmitted between the inner ring 13 and the outer ring 11 via one of the pair of opposed rollers 15.

  Here, when the input shaft 22 is stopped and the rotation direction of the input shaft 22 is switched, the rotation of the inner ring 13 is transmitted to the outer ring 11 via the other roller 15.

  As described above, when the energization of the electromagnetic coil 53a is interrupted, the control holder 16A and the rotary holder 16B rotate relative to each other in the direction in which the circumferential width of the pocket 31 is increased, and each of the pair of opposed rollers 15 has the cylindrical surface 12. Further, since the standby state in which the cam surface 14 is immediately engaged is set, the rotation direction play is small, and the rotation of the inner ring 13 can be immediately transmitted to the outer ring 11.

  Further, since the rotational torque is transmitted from the inner ring 13 to the outer ring 11 through the same number of rollers 15 as the cam surface 19, a large rotational torque can be transmitted from the inner ring 13 to the outer ring 11.

  When the control retainer 16A and the rotation retainer 16B are relatively rotated in the direction in which the circumferential width of the pocket 31 is increased, the ball 43 rolls and moves toward the shallow groove portion of the pair of opposed cam grooves 41 and 42. The state shown in FIG.

  In the embodiment shown in FIG. 1, the control retainer 16 </ b> A and the rotation retainer 16 </ b> B are configured such that the pillar portions 25 and 29 are positioned between the outer ring 11 and the inner ring 13, and the flanges 24 and 28 that are opposed in the axial direction are Since it is incorporated between the armatures 51, the axial length of the outer ring 11 can be reduced in size and weight.

  Further, the inner diameter surface of the armature 51 is slidably supported by the cylindrical outer diameter surface of the support ring 30 fitted to the input shaft 22, and the flange inner diameter surface of the control retainer 16 </ b> A is formed on the outer periphery of the input shaft 22. The armature 51 can always be held parallel to the rotor 52 by supporting the slide guide surface 32 so as to be movable, and the armature 51 is surely magnetically attracted to the rotor 52 by energizing the electromagnet 53. be able to. For this reason, the roller 15 can be engaged and disengaged with high precision, and a highly reliable rotation transmission device can be obtained.

  As shown in the embodiment, by forming the support ring 30 fitted to the input shaft 22 with a non-magnetic material, it is possible to prevent magnetic flux from leaking from the armature 51 to the input shaft 22. For this reason, a small electromagnet 53 can be adopted, and the rotation transmission device can be miniaturized.

  8 and 9 show another example of the support ring 30. In the support ring 30 shown in FIG. 8, a plurality of grooves 37 extending in the axial direction are formed on the outer diameter surface thereof at intervals in the circumferential direction.

  As described above, by forming the plurality of axial grooves 37 on the outer diameter surface of the support ring 30, leakage of magnetic flux from the armature 51 to the input shaft 22 can be effectively prevented.

  In the support ring 30 shown in FIG. 9, a coating film 38 having a low friction coefficient is formed on the side surface of the rotary cage 16B facing the flange 28.

  An example of the low friction coefficient coating film 38 is tetrafluoroethylene resin.

  As described above, by forming the coating film 38 having a low friction coefficient on the side surface of the support ring 30, the flange 28 of the rotary cage 16 </ b> B can be rotatably supported by the coating film 38. Therefore, it is not necessary to incorporate the thrust roller bearing 33 shown in FIG. 8, and the assemblability can be improved by reducing the number of parts.

DESCRIPTION OF SYMBOLS 1 Housing 2 Bearing cylinder 3 Positioning ring 5 Elastic member 6 Retaining ring 11 Outer ring 12 Cylindrical surface 13 Inner ring 14 Cam surface 15 Roller 16A Control retainer 16B Rotation retainer 21 Elastic member 22 Input shaft 24 Flange 25 Column 28 Flange 29 Column Part 30 support ring 31 pocket 32 slide guide surface 33 thrust roller bearing 33a raceway ring 33b raceway ring 33c roller 33d cage 34 step part 37 groove 38 coating film 40 torque cam 50 electromagnetic clutch 51 armature 52 rotor 53 electromagnet

Claims (9)

A plurality of cam surfaces that form a cylindrical surface on one side of the inner periphery of the outer ring and the outer periphery of the inner ring that is incorporated inside the outer ring, and that form a narrow wedge space between the cylindrical surface and the other end in the circumferential direction. A pair of opposed rollers in each of the wedge spaces formed between the plurality of cam surfaces and the cylindrical surface, and an elastic member that urges the opposed pair of rollers away from each other Each of the pair of opposed rollers is held by a cage, and the cage is composed of a control cage and a rotary cage, and both of the cages have a plurality of pillars on the outer periphery of the annular flange. The two cages are configured such that the flanges face each other in the axial direction and the column portions are alternately arranged in the circumferential direction. The opposed pair of rollers and the elastic member are accommodated. Pocket is formed, and the circumferential width of the pocket is reduced between the opposing surfaces of the flange of the control cage and the flange of the rotary cage by moving the control cage in a direction in which the distance between the opposed flanges is reduced. A torque cam for rotating the pair of cages relative to each other in a decreasing direction is provided, and an electromagnetic clutch for moving the control cage in the axial direction is provided on the input shaft having the inner ring at the shaft end. An armature supported movably in the axial direction, a rotor that faces the armature in the axial direction, is positioned in the axial direction by a step provided on the outer periphery of the input shaft, and faces the rotor in the axial direction And an electromagnet that attracts the armature to the rotor when energized, and the control retainer is moved in the axial direction by connecting the control retainer to the armature. In the rotation transmitting apparatus which,
The control cage and rotate the cage, the column portion is disposed between the outer ring and the inner ring, a flange facing in the axial direction and embedded disposed between the opening end face and the armature of the outer ring, the flange of the control retainer Is provided with a cylindrical portion opposite to the column portion, and the armature and the control retainer are connected and integrated by the cylindrical portion and a connecting cylinder provided on the outer peripheral portion of the armature, and between the rotor and the stepped portion, The armature is slidably supported on the outer diameter surface, and a support ring that prevents the rotation retainer from moving to the armature side is fitted on the side surface facing the rotation retainer, and the support ring is nonmagnetic. A rotation transmission device characterized by being formed of a body.   The rotation transmission device according to claim 1, wherein a groove extending in the axial direction is provided on the outer diameter surface of the support ring at intervals in the circumferential direction.   The rotation transmission device according to claim 1, wherein the support ring is made of a nonmagnetic metal.   The rotation transmission device according to claim 1, wherein the support ring is made of a synthetic resin.   The rotation transmission device according to claim 4, wherein the synthetic resin is made of one of polyacetal, polyamide, polytetrafluoroethylene, and polyphenylene sulfide.   The rotation transmission device according to any one of claims 1 to 5, wherein a coating film having a low friction coefficient is provided on a side surface of the support ring facing the rotation cage.   The rotation transmission device according to any one of claims 1 to 5, wherein a thrust roller bearing that rotatably supports the rotary cage is incorporated between the support ring and the rotary cage.   The thrust roller bearing includes a pair of bearing rings and a non-separable thrust roller bearing having a cage that holds the rollers and rollers between the bearing rings, and the pair of bearing rings is not separated in the axial direction. The rotation transmission device according to claim 7.   The rotation transmission device according to any one of claims 1 to 8, wherein a slide guide surface that slidably supports a flange inner diameter surface of the control cage is provided on an outer periphery of the input shaft.

Images