JP2008045706A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmitting device having a small number of components for preventing an engaging error of a two-way clutch by reducing rattling in the rotating direction. <P>SOLUTION: The two-way clutch 10 is incorporated between an outer ring 1 and a cam ring 4 and provided with an electromagnetic clutch 30. The two-way clutch 10 is a roller clutch having a roller 13 incorporated between the outer ring 1 and the cam ring 4 and held by a cage 14. Pockets 15 formed in the cage 14 are composed of first pockets 15a for storing a half number of rollers 13 and second pockets 15b for storing remaining rollers 13. The first pockets 15a are formed at positions deviating from a two-equally divided position along the peripheral length of a cam face 12 to one peripheral end of a wedge space, and the second pockets 15b are formed at positions deviating to the other peripheral end of the wedge space and arranged unequally in the peripheral direction. During the rotation of the cam ring 4 relative to the cage 14, the rollers 13 are immediately engaged with a cylindrical face 11 and the cam face 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation transmission device used for switching between power transmission and cutoff on a power transmission path.

  In an FR-based four-wheel drive vehicle, a two-way clutch is incorporated between the outer ring and the cam ring built into the outer ring as a rotation transmission device that transmits and blocks driving force to the front wheel as an auxiliary drive wheel. The electromagnetic clutch attached to the clutch controls the engagement and disengagement of the two-way clutch, the outer ring and the cam ring are coupled by the engagement of the two-way clutch, and torque is transmitted between the outer ring and the cam ring. What has been known is conventionally known.

  Here, as shown in FIG. 13 (I), the two-way clutch forms a cylindrical surface 41 on the inner periphery of the outer ring 40, and both ends of the cam ring 42 in the circumferential direction are between the cylindrical surface 41 and the outer periphery. A cam surface 43 that forms a narrow wedge-shaped space is provided, a roller 44 is incorporated between the cam surface 43 and the cylindrical surface 41, and the roller 44 is rotated by relative rotation between the cage 45 that holds the roller 44 and the cam ring 42. The cylindrical surface 41 and the cam surface 43 are engaged with each other.

  Here, the retainer 45 is elastically held in a neutral position where the roller 44 is disengaged from the cylindrical surface 41 and the cam surface 43 by a switch spring (not shown) incorporated between the retainer 45 and the cam ring 42.

  On the other hand, although not shown in the figure, the electromagnetic clutch faces the rotor connected to the outer ring 40 on the armature that is prevented from rotating by the retainer 45 and is movably supported in the axial direction, and the electromagnet faces the rotor. By energizing the electromagnet, the armature is attracted to the rotor, and the roller 44 is engaged with the cylindrical surface 41 and the cam surface 43 by the relative rotation of the armature coupled to the outer ring 40 and the cam ring 42.

  By the way, in the two-way clutch in the rotation transmission device, the roller 44 is pushed into the narrow portion on the left side toward the wedge-shaped space and rotated in the direction indicated by the arrow of the cam ring 42 as shown in FIG. If the balance between the rotational speeds of the cam ring 42 and the outer ring 40 or the balance of the torques is reversed, the roller 44 moves to the right as shown by the chain line in FIG. It will be pushed into the narrow part on the right side of the wedge-shaped space.

  At this time, the movement angle θ of the roller 44 becomes a backlash in the rotational direction of the two-way clutch, and since the backlash in the rotational direction is large, there is a disadvantage that a shock occurs when the roller 44 is engaged.

  In order to eliminate such inconvenience, the applicant of the present invention incorporated two cages having different diameters between the cam ring portions formed on the outer ring and the input shaft in Patent Document 1, and the normal rotation roller is installed in one of the cages. Hold the reverse roller with the other cage, rotate the two cages in opposite directions, and bring both the forward roller and the reverse roller into contact with or close to the cylindrical surface and the cam surface. A rotation transmission device has been proposed that is displaced to the standby position and immediately engages one of the forward rotation roller and the reverse rotation roller with the cylindrical surface and the cam surface in accordance with the rotation direction of the input shaft.

Japanese Patent Laid-Open No. 2005-061423

  By the way, in the rotation transmission device described in Patent Document 1, two cages having different diameters are necessary, and a cam member or the like that relatively rotates the two cages is required. The number of points is large, and due to the backlash of the connecting portions of the respective portions, it is difficult to ensure the reliability of the engagement and disengagement of the rollers, and there is a point to be improved.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotation transmission device with a small number of parts, in which the backlash in the rotational direction is small and the two-way clutch can be prevented from being misengaged.

  In order to solve the above problems, in the first invention, a cylindrical surface is formed on the inner periphery of the outer ring, and both ends in the circumferential direction are narrow between the outer periphery of the cam ring incorporated inside the outer ring and the cylindrical surface. A plurality of cam surfaces that form a wedge-shaped space are provided in the circumferential direction, and the cage built between the outer ring and the cam ring is formed with a pocket at a position facing each cam surface, and a roller is accommodated in each pocket. Then, the retainer is elastically held at the disengaged position where the roller is disengaged from the cylindrical surface and the cam surface by applying the elastic force of the switch spring to the retainer, and the retainer is prevented from rotating. In addition, the armature supported to be movable in the axial direction and the rotor that is prevented from rotating by the outer ring are opposed in the axial direction, an electromagnet is opposed to the rotor, and a magnetic attraction force is applied to the armature by energizing the electromagnet. Armature In the rotation transmission device adapted to be adsorbed, the number of pockets formed in the cage is one for one cam surface and the same number as the cam surface. The pocket is located at a position that is offset from the half of the circumferential length of the cam surface to the narrow side of the circumferential end of the wedge-shaped space, and the other pocket is half of the circumferential length of the cam surface. The plurality of pockets are arranged unevenly in the circumferential direction so as to be arranged at a position offset from the position toward the narrow part at the other circumferential end of the wedge-shaped space, and each cam surface has a roller at a position facing the pocket. The structure which formed the recessed part which accommodated a part of outer periphery of this, and hold | maintained a roller to the idle state in which a radial clearance is formed between the said cylindrical surfaces was employ | adopted.

  Here, the concave portion may be formed in an arc shape along the outer periphery of the roller, or may be formed by two surfaces inclined in opposite directions and positioned on the narrow portion side of the wedge-shaped space. This surface may be an arcuate surface along the outer periphery of the roller, and the other surface located on the wide portion side of the wedge-shaped space may be a tapered surface. As described above, the concave portion is formed in an arc shape, or the surface on the narrow portion side of the wedge-shaped space is formed in an arc shape, so that the roller is displaced to an engagement position where the roller is engaged with the narrow portion of the wedge-shaped space when the cam ring is idling. Can be surely prevented.

  In the second aspect of the invention, a cylindrical surface is formed on the inner periphery of the outer ring, and a wedge-shaped space having narrow ends in the circumferential direction between the cylindrical surface and the outer periphery of the cam ring incorporated inside the outer ring is formed. A plurality of cam surfaces are provided in the circumferential direction, and a cage is formed between the outer ring and the cam ring, and a pocket is formed at a position facing each cam surface, and a roller is accommodated in each pocket. The retainer is elastically held at the disengagement position where the roller is disengaged from the cylindrical surface and the cam surface by applying the elastic force of the switch spring. The armature supported by the outer ring and the rotor that is prevented from rotating by the outer ring are opposed in the axial direction, the electromagnet is opposed to the rotor, and a magnetic attraction is applied to the armature by energizing the electromagnet so that the armature is attracted to the rotor. In the rotation transmission device, the number of pockets formed in the cage is two with respect to one cam surface to be twice the number of cam surfaces, and the two pockets facing one cam surface are mutually connected. In FIG. 1, one pocket is disposed at a position offset from the half of the circumferential length of the cam surface toward the narrow portion at one circumferential end of the wedge-shaped space, and the other pocket is 2 of the circumferential length of the cam surface. The plurality of pockets are arranged unevenly in the circumferential direction so as to be arranged at a position offset from the equally divided position toward the narrow part at the other circumferential end of the wedge-shaped space. A configuration is adopted in which a recess is formed that accommodates each of the two opposing rollers and holds each roller in an idling state in which a radial gap is formed between the rollers.

  In the second aspect of the invention, by forming an arcuate surface along the outer periphery of the roller at both circumferential ends of the recess, it is possible to reliably prevent the roller from being displaced to the engaging position when the cam ring is idling.

  As in the first aspect of the invention, the plurality of pockets formed in the cage are unevenly arranged in the circumferential direction, and half of the pockets are wedge-shaped spaces from the bisected position of the circumferential length of the cam surface. The other half of the pocket is offset from the half of the circumferential length of the cam surface to the narrow side of the other circumferential end of the wedge-shaped space. As a result, when the cam ring and the cage are relatively rotated in one direction, half of the plurality of rollers are immediately engaged with the cylindrical surface and the cam surface, and when the cam ring and the cage are relatively rotated in the other direction, The remaining half of the rollers are immediately engaged with the cylindrical surface and the cam surface, and a rotation transmission device with a small number of parts in the rotational direction can be obtained.

  In addition, by providing a recess for accommodating a part of the outer periphery of the roller on each of the plurality of cam surfaces formed on the outer periphery of the cam ring, the dimensions of the parts vary and there is misalignment between the outer ring and the cam ring. Even in this case, a radial clearance can be secured between the cylindrical surface of the inner periphery of the outer ring and the roller. For this reason, in the disengaged state of the two-way clutch, the roller is not displaced to the engaged position, and a highly reliable two-way clutch in which the roller is not misengaged during idling can be obtained. .

  As in the second invention, a pocket is formed in the cage so as to face each of a plurality of cam surfaces formed on the cam ring, and two pockets are provided so as to face one cam surface. One pocket of one of the pockets is located at a position offset from the half of the circumferential length of the cam surface toward the narrow portion at one circumferential end of the wedge-shaped space, and the other pocket is 2 of the circumferential length of the cam surface. When the cam ring and the cage are rotated relative to each other in one direction, the half of the plurality of rollers becomes cylindrical and When the cam ring is immediately engaged with the cam surface and the cam ring and the cage are relatively rotated in the other direction, the remaining half of the rollers are immediately engaged with the cylindrical surface and the cam surface. Small It is possible to obtain the rotation transmission device.

  In addition, each of the plurality of cam surfaces formed on the outer periphery of the cam ring is provided with a recess that accommodates each of the two rollers facing each cam surface, so that the dimensions of the parts vary and the outer ring and the cam ring Even if there is a misalignment between them, a radial gap can be secured between the cylindrical surface of the inner periphery of the outer ring and the roller. For this reason, as in the first aspect of the invention, in the disengaged state of the two-way clutch, the roller is not displaced to the engaged position, and the roller is not misengaged during idling and is highly reliable. A two-way clutch can be obtained.

  For this reason, as in the first aspect of the invention, in the disengaged state of the two-way clutch, the roller is not displaced to the engaged position, and the roller is not misengaged during idling and is highly reliable. A two-way clutch can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an input shaft 2 is inserted inside the outer ring 1, and the input shaft 2 and the outer ring 1 are relatively rotatably supported by a bearing 3.

  A cam ring 4 is fitted to a portion of the input shaft 2 located in the outer ring 1, and the cam ring 4 is prevented from rotating around the input shaft 2 by a serration 5 and is positioned in the axial direction by a retaining ring 6.

  A two-way clutch 10 is incorporated between the outer ring 1 and the cam ring 4. As shown in FIGS. 1 and 5, the two-way clutch 10 is formed with a cylindrical surface 11 on the inner periphery of the outer ring 1, and the outer periphery of the cam ring 4 is narrow at both ends in the circumferential direction with the cylindrical surface 11. A flat cam surface 12 forming a wedge-shaped space is provided continuously in the circumferential direction, and a roller 13 is incorporated between each cam surface 12 and the cylindrical surface 11, and the roller 13 is held by a cage 14.

  Here, the retainer 14 has a first pocket 15a that individually accommodates half of the plurality of rollers 13 and a second pocket 15b that individually accommodates the other half of the rollers 13, The first pockets 15a and the second pockets 15b are alternately arranged in the circumferential direction. Further, the first pocket 15a is formed at a position offset from one half of the circumferential length of the cam surface 12 to one end in the circumferential direction of the wedge-shaped space, while the second pocket 15b is formed around the circumference of the cam surface 12. It is formed at a position that is offset from the bisected position in the direction length toward the other end in the circumferential direction of the wedge-shaped space, and is unequally arranged in the circumferential direction.

As shown in FIGS. 5 and 6, each cam surface 12 is formed with a recess 16 in which a part of the outer periphery of the roller 13 can be accommodated. The recess 16 has an arc shape along the outer periphery of the roller 13, and a radial clearance δ ₁ is formed between the roller 13 and the cylindrical surface 11 of the outer ring 1 in a state where the outer periphery of the roller 13 is accommodated in the recess 16. Is formed.

  As shown in FIGS. 2 and 4, a spring accommodating recess 17 is formed at one end of the cam ring 4, and a switch spring 18 is incorporated in the spring accommodating recess 17. The switch spring 18 has a C shape, and a pair of pressing pieces 18 a provided outward from both ends thereof are provided with a notch 19 formed in the peripheral wall of the spring accommodating recess 17 and a notch provided at the end of the retainer 14. The side surfaces of the notches 19 and 20 that are inserted in the circumferential direction of the notches 19 and 20 are opposed to each other in opposite directions, and the retainer 14 is elastically held so that the rollers 13 are accommodated in the recesses 16 by the pressing. Has been.

  The switch spring 18 is prevented from coming out of the spring accommodating recess 17 by the connecting plate 21 fitted to the small diameter cylindrical portion 4 a at the end of the cam ring 4. The connecting plate 21 is positioned in the axial direction by a retaining ring 22, and an L-shaped engagement piece 23 is provided on the outer periphery. The engagement piece 23 engages with the notch 20 provided at the end of the retainer 14, and the connecting plate 21 is prevented from rotating around the retainer 14 by the engagement.

  As shown in FIGS. 1 and 2, an electromagnetic clutch 30 that controls the engagement and disengagement of the two-way clutch 10 is provided between the outer ring 1 and the cage 14 in addition to the two-way clutch 10. It has been.

  The electromagnetic clutch 30 includes an armature 31 disposed to face the end face of the cage 14, a rotor 32 that faces the armature 31 in the axial direction, and an electromagnet 33 that faces the rotor 32 in the axial direction.

  As shown in FIG. 2, the armature 31 is slidably fitted to a cylindrical portion 4 a provided at the end of the cam ring 4. An engagement hole 34 is formed in the armature 31, and the engagement piece 23 on the outer periphery of the connecting plate 21 is engaged with the engagement hole 34, and the armature 31 is prevented from rotating with respect to the retainer 14 by the engagement. And is movable in the axial direction.

  The rotor 32 is press-fitted into the end portion of a rotor guide 36 made of a non-magnetic material connected to the opening end portion of the outer ring 1 and is prevented from rotating around the rotor guide 36. A plurality of arc-shaped slits 37 are formed in the rotor 32 at intervals in the circumferential direction.

  An elastic member 39 that urges the armature 31 in a direction away from the rotor 32 is incorporated between the facing end surfaces of the armature 31 and the connecting plate 21.

  The electromagnet 33 includes an electromagnetic coil 33a and a core 33b that supports the electromagnetic coil 33a. When the electromagnetic coil 33a is energized, a magnetic flux flows through the core 33b, the rotor 32, and the armature 31, and an attractive force is applied to the armature 31. It has come to be.

  The rotation transmission device shown in the embodiment has the above structure, and FIG. 2 shows the disengaged state of the two-way clutch 10, and even if the cam ring 4 rotates together with the input shaft 2, the rotation is transmitted to the outer ring 1. Instead, the cam ring 4 rotates freely.

  When the electromagnetic coil 33a of the electromagnet 33 is energized in the rotating state of the cam ring 4, a magnetic flux flows between the core 33b, the rotor 32 and the armature 31, and a magnetic attraction force is applied to the armature 31. As shown in FIG. 31 is adsorbed by the rotor 32.

  Due to the adsorption of the armature 31, the frictional resistance acting on the adsorption surface becomes the rotational resistance of the cage 14, so that the cam ring 4 and the cage 14 rotate relatively.

  Here, when the cam ring 4 rotates in the counterclockwise direction indicated by the arrow in FIG. 6 with respect to the retainer 14, the roller 13 accommodated in the first pocket 15a comes out of the recess 16 as shown in FIG. Engages with the cylindrical surface 11 and the cam surface 12. At this time, the first pocket 15a is formed at a position that is offset from one half of the circumferential length of the cam surface 12 toward one end in the circumferential direction of the wedge-shaped space. When rotating, the roller 13 in the first pocket 15 a immediately engages with the cylindrical surface 11 and the cam surface 12, and the two-way clutch 10 is engaged, and the rotation of the cam ring 4 is transmitted to the outer ring 1.

  Further, when the cam ring 4 rotates in the opposite direction shown by the arrow in FIG. 6 with respect to the cage 14, the roller 13 accommodated in the second pocket 15 b comes out of the recess 16, and the cylindrical surface 11 and the cam surface 12. Engage with. At this time, the second pocket 15b is formed at a position that is offset from the bisected position of the circumferential length of the cam surface 12 to the other circumferential end of the wedge-shaped space. When the relative rotation occurs, the roller 13 in the second pocket 15 b immediately engages with the cylindrical surface 11 and the cam surface 12, the two-way clutch 10 is engaged, and the rotation of the cam ring 4 is transmitted to the outer ring 1.

  Thus, when the cam ring 4 and the cage 14 are relatively rotated, the roller 13 accommodated in the first pocket 15a or the roller 13 accommodated in the second pocket 15b immediately engages with the cylindrical surface 11 and the cam surface 12. Therefore, there is very little play in the rotational direction, and there is no engagement shock or abnormal noise during engagement.

  Further, by forming the first pockets 15a and the second pockets 15b unevenly in the cage 14, the rollers 13 accommodated in the pockets 15a and 15b are immediately engaged with the cylindrical surface 11 and the cam surface 12. Therefore, it is possible to obtain a rotation transmission device that has a simple configuration with a small number of parts and a small amount of backlash.

  When the energization of the electromagnet 33 shown in FIG. 1 to the electromagnetic coil 33a is interrupted in the engaged state of the two-way clutch 10 shown in FIG. 7, the armature 31 is separated from the rotor 32 by the restoring force of the elastic member 39, and the switch spring As shown in FIG. 6, the retainer 14 rotates due to the restoring elasticity of the roller 18, and the roller 13 incorporated in the first pocket 15a and the roller 13 incorporated in the second pocket 15b fit into the recess 16, as shown in FIG. The two-way clutch 10 is disengaged, the rotation transmission from the cam ring 4 to the outer ring 1 is cut off, and the cam ring 4 rotates freely.

At this time, since the radial gap δ ₁ is secured between the roller 13 and the cylindrical surface 11 of the outer ring 1, the roller 13 is not displaced to the engagement position and is misengaged. There is no.

  In FIG. 6, the recess 16 formed on the cam surface 12 has an arc shape along the outer periphery of the roller 13, but the recess 16 is not limited to this. For example, as shown in FIG. 8, two surfaces 16 a and 16 b inclined in opposite directions are formed, and one surface 16 a located on the narrow portion side of the wedge-shaped space is an arc-shaped surface along the outer periphery of the roller 13. The other surface 16b located on the wide portion side of the wedge-shaped space may be a tapered surface.

  FIG. 9 shows a state in which the roller 13 is engaged with the cam surface 12 and the cylindrical surface 11 by the relative rotation of the cam ring 4 and the cage 14. As shown in FIG. 8, one surface 16a located on the narrow portion side of the wedge-shaped space of the recess 16 has an arcuate surface, or, as shown in FIG. Thus, it is possible to reliably prevent the roller 13 from being displaced to the engagement position during the idling of 4.

  10 to 12 show another example of the rotation transmission device according to the present invention. In this example, the cage 14 is provided with two pockets 15 c and 15 d facing each cam surface 12 of the plurality of cam surfaces 12 formed on the outer periphery of the cam ring 4, and one of the pockets 15 c is provided around the cam surface 12. The wedge-shaped space is arranged at a position that is offset from the bisected position of the directional length toward the narrow portion at one end in the circumferential direction of the wedge-shaped space, and the other pocket 15d is spaced from the bisected position of the circumferential length of the cam surface 12 A plurality of pockets formed in the retainer 14 are arranged unevenly in the circumferential direction by being arranged at a position offset toward the narrow portion at the other end in the circumferential direction.

In addition, each cam surface 12 is formed with a recess 25 in which the two rollers 13 in the pockets 15 c and 15 d facing the cam surface 12 are accommodated. An arcuate surface 26 is formed along the outer periphery of each roller 13 at both ends in the circumferential direction of the recess 25 while maintaining the idling state in which the gap δ ₂ is formed.

  Since other configurations are the same as those of the rotation transmission device shown in FIGS. 1 to 7, the same components are denoted by the same reference numerals and description thereof is omitted.

  Also in the rotation transmission device shown in FIGS. 10 to 12, each of the plurality of rollers 13 is arranged at the end of the wedge-shaped space on the narrow portion side, so that the cam ring 4 is relative to the retainer 14 in FIG. As shown in FIG. 12, half of the rollers 13 immediately engage with the cylindrical surface 11 and the cam surface 12.

  When the cam ring 4 rotates relative to the cage 14 in the direction opposite to the direction indicated by the arrow in FIG. 11, the remaining half of the rollers 13 are immediately engaged with the cylindrical surface 11 and the cam surface 12. Thus, it is possible to obtain a rotation transmission device with little rotation direction backlash.

Further, each of the cam surfaces 12 is provided with a recess 25 that accommodates each of the two rollers 13 facing each of the cam surfaces 12, so that the dimensions of the parts may vary and the core between the outer ring 1 and the cam ring 4 may be centered. Even if there is a deviation, a radial gap δ ₂ can be secured between the cylindrical surface 11 on the inner periphery of the outer ring 1 and the roller 13. For this reason, in the disengaged state of the two-way clutch 10, the roller 13 is not displaced to the engaged position, and the highly reliable two-way clutch 10 that does not misengage the roller 13 during idling is provided. Obtainable.

Longitudinal front view showing an embodiment of a rotation transmission device according to the present invention Sectional drawing which expands and shows the electromagnetic clutch part of FIG. Sectional drawing which shows the engagement state of the electromagnetic clutch of FIG. Sectional view along line IV-IV in FIG. Sectional view along line VV in FIG. Sectional drawing which shows the disengagement state of the two-way clutch shown in FIG. Sectional drawing which shows the engagement state of the two-way clutch shown in FIG. Sectional drawing which shows the other example of the recessed part formed in a cam surface Sectional drawing which shows the engagement state of the two-way clutch shown in FIG. Longitudinal front view showing another embodiment of the rotation transmission device according to the present invention Sectional drawing which shows the disengagement state of the two-way clutch shown in FIG. Sectional drawing which shows the engagement state of the two-way clutch shown in FIG. (I) is a sectional view of a two-way clutch of a conventional rotation transmission device, and (II) is a sectional view showing an engaged state of the two-way clutch.

Explanation of symbols

1 outer ring 4 cam ring 11 cylindrical surface 12 cam surface 12a first cam surface 12b second cam surface 13 roller 14 cage 15 pocket 15a first pocket 15b second pocket 15c first pocket 15d second pocket 16 recess 16a inclined surface 16b inclined Surface 18 Switch spring 31 Armature 32 Rotor 33 Electromagnet

Claims (5)

A cylindrical surface is formed on the inner periphery of the outer ring, and a plurality of cam surfaces are formed in the circumferential direction on the outer periphery of the cam ring incorporated inside the outer ring. The cage assembled between the outer ring and the cam ring is formed with a pocket at a position facing each cam surface, a roller is accommodated in each pocket, and the elastic force of the switch spring is loaded on the cage. The retainer is elastically held at the disengagement position where the roller is disengaged from the cylindrical surface and the cam surface. The retainer is rotated around the armature and the outer ring which are supported by the retainer and movably in the axial direction. In the rotation transmission device in which the stopped rotor is opposed in the axial direction, the electromagnet is opposed to the rotor, and the armature is attracted to the rotor by applying a magnetic attraction to the armature by energizing the electromagnet.
The number of the pockets formed in the cage is one for each cam surface and the same number as the cam surface, and one pocket is the circumferential length of the cam surface between two pockets adjacent in the circumferential direction. It is arranged at a position offset from the bisected position toward the narrow part of one end in the circumferential direction of the wedge-shaped space, and the other pocket is located at the other end in the circumferential direction of the wedge-shaped space from the bisected position of the circumferential length of the cam surface. The plurality of pockets are arranged unevenly in the circumferential direction so as to be arranged at a position offset toward the narrow portion side of each, and each cam surface accommodates a part of the outer periphery of the roller at a position facing the pocket. A rotation transmission device characterized in that a recess is formed to hold an idling state in which a radial clearance is formed between the cylindrical surface and the cylindrical surface.   The rotation transmission device according to claim 1, wherein the concave portion has an arc shape along the outer periphery of the roller.   The concave portion is formed by two surfaces inclined in opposite directions, and one surface located on the narrow portion side of the wedge-shaped space is an arc-shaped surface along the outer periphery of the roller, and on the wide portion side of the wedge-shaped space. The rotation transmission device according to claim 1, wherein the other surface is a tapered surface. A cylindrical surface is formed on the inner periphery of the outer ring, and a plurality of cam surfaces are formed in the circumferential direction on the outer periphery of the cam ring incorporated inside the outer ring. The cage assembled between the outer ring and the cam ring is formed with a pocket at a position facing each cam surface, a roller is accommodated in each pocket, and the elastic force of the switch spring is loaded on the cage. The retainer is elastically held at the disengagement position where the roller is disengaged from the cylindrical surface and the cam surface. The retainer is rotated around the armature and the outer ring which are supported by the retainer and movably in the axial direction. In the rotation transmission device in which the stopped rotor is opposed in the axial direction, the electromagnet is opposed to the rotor, and the armature is attracted to the rotor by applying a magnetic attraction to the armature by energizing the electromagnet.
The number of pockets formed in the cage is two with respect to one cam surface to be twice the number of cam surfaces, and one pocket is between two pockets facing one cam surface. It is arranged at a position that is offset from the bisected position of the circumferential length of the cam surface toward the narrow portion at one circumferential end of the wedge-shaped space, and the other pocket is wedged from the bisected position of the circumferential length of the cam surface. The plurality of pockets are arranged unevenly in the circumferential direction so as to be arranged at a position offset toward the narrow portion at the other circumferential end of the shape space, and each cam surface has two rollers facing the cam surface. And a recess for holding each roller in an idling state in which a radial gap is formed between the roller and the cylindrical surface.   The rotation transmission device according to claim 4, wherein arc-shaped surfaces along the outer periphery of the roller are formed at both ends in the circumferential direction of the recess.

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