JP5981244B2 - Rotation transmission device - Google Patents

Description

  The present invention relates to a rotation transmission device used for switching rotation transmission and switching.

  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 in the inner ring, and pillar portions formed in each cage are alternately arranged in the circumferential direction. Assembling, assembling a pair of opposed rollers in a pocket formed between adjacent column parts, urging 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 provided with 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 flange of the rotary cage. The control cage and the rotary cage are rotated relative to each other 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 at the pillar portion of each cage. 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.

  Further, a spring support piece is provided on the outer periphery of an annular spring holder that is fitted to the input shaft and abutted against one end surface of the inner ring, and the spring support piece prevents the elastic member from moving radially outward. Therefore, the pressing position at which the elastic member presses the pair of rollers is constant, the roller can be pressed reliably in the engaging direction, and the two-way clutch can function reliably. Have.

JP 2009-287724 A

  By the way, in the rotation transmission device described in the above-mentioned Patent Document 1, a through hole that penetrates both sides is formed in the spring support piece, and an elastic member made of a coil spring is inserted into the through hole, and the diameter of the elastic member is reduced. The structure prevents the movement in the direction, and the assembly direction of the elastic member is a direction orthogonal to the length direction of the column portion, and therefore the column portion impedes the assembly of the elastic member. For this reason, it is necessary to assemble the elastic member while bending it in the length direction, which makes it difficult to assemble, and there remains a point to be improved in improving the assembleability.

  An object of the present invention is to improve the assemblability of an elastic member that urges a pair of opposed rollers in opposite directions in the rotation transmission device that controls engagement and release of a two-way clutch by an electromagnetic clutch. That is.

  In order to solve the above-described problems, in the present invention, a two-way clutch that transmits and blocks rotation from an input shaft to an output shaft that is arranged coaxially with the input shaft, and engagement of the two-way clutch And an electromagnetic clutch for controlling release, wherein the two-way clutch is controlled between the inner periphery of the outer ring provided at the shaft end portion of the output shaft and the outer periphery of the inner ring provided at the shaft end portion of the input shaft. A plurality of pillars provided in the cage and a plurality of pillars provided in the rotary cage are assembled alternately so as to be arranged in the circumferential direction to form a pocket between adjacent pillars, and face each other in the pocket. A pair of engagement elements are incorporated, and the pair of engagement elements are configured to be urged toward the direction of engagement with the inner circumference of the outer ring and the outer circumference of the inner ring by an elastic member incorporated between the opposed portions. The input shaft is abutted against one end face of the outer ring opening side of the A spring support piece for preventing the elastic member from moving radially outward is provided on the outer periphery of an annular spring holder that rotates integrally, and the control retainer and the rotation retainer are connected to the pocket by energizing the electromagnetic clutch. In the rotation transmission device in which the pair of opposed engagement elements are disengaged by relatively rotating in a direction in which the circumferential width is reduced, the spring support piece is axially maintained in a state parallel to the outer periphery of the inner ring. As a plate-like shape that extends to the outer periphery of the elastic member, a configuration is adopted in which an opening of a size that allows the elastic member to be inserted is formed between the tip of the spring support piece and the outer periphery of the inner ring. .

  As described above, the spring support piece provided on the spring holder is shaped like a plate that projects to the outer periphery of the elastic member while maintaining a state parallel to the outer periphery of the inner ring, so that the tip edge of the spring support piece and the inner ring An opening is formed between the outer peripheries, and an elastic member can be incorporated into the pocket from the opening. At this time, since the elastic member is incorporated along the length direction of the column portion, the column portion does not hinder the assembly of the elastic member, and the elastic member can be assembled very easily. .

  In the rotation transmission device according to the present invention, when a tapered surface is provided at the edge where the inner surface of the spring support piece intersects the circumferential side surface, the elastic member is attached to the side edge of the spring support piece when the elastic member contracts. Generation | occurrence | production of the disadvantage that a contraction arises and contraction is inhibited can be prevented, and an elastic member can be contracted smoothly.

  If the spring holder is a press-molded product, the spring holder can be easily manufactured, and the cost can be reduced.

  Furthermore, by fitting a washer to the input shaft and abutting against the other end surface of the inner ring, the roller can be prevented from moving toward the other end side of the inner ring, and the roller can be prevented from falling out of the pocket. Can be prevented. At this time, by setting the outer diameter of the washer to be larger than the diameter of the virtual circle passing through the centers of the plurality of elastic members, it is possible to prevent the elastic members from falling off at the same time as preventing the rollers from falling off.

  By adopting a coil spring with an elliptical cross section as the elastic member, the symmetric position can be pressed with the bisected position in the length direction of the roller as the symmetric point, thus preventing the roller from skewing. Can do.

  In the present invention, as described above, the spring support piece provided on the spring holder and preventing the elastic member from moving radially outwardly extends in the axial direction while maintaining a state parallel to the outer periphery of the inner ring. By forming a plate piece projecting around the outer periphery of the elastic member, the elastic member can be incorporated into the pocket along the length direction of the pillar portion from the opening formed between the tip edge of the spring support piece and the outer periphery of the inner ring. As a result, the elastic member can be assembled very easily.

A longitudinal sectional view showing an embodiment of a rotation transmission device according to the present invention Sectional view along the line II-II in FIG. Sectional drawing which expands and shows a part of 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. The perspective view of the spring holder shown in FIG. (c), (d) is a cross-sectional view showing the step-by-step incorporation of the elastic member

  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 an input shaft 1, an output shaft 2 arranged coaxially with the input shaft 1, a housing 3 that covers the shaft ends of both shafts, and the housing 3. The two-way clutch 10 that transmits and shuts off the rotation from the input shaft 1 to the output shaft 2 and the electromagnetic clutch 50 that controls the engagement and release of the two-way clutch 10.

  The housing 3 has a cylindrical shape, and a small-diameter bearing cylinder 4 is provided at one end thereof, and the output shaft 2 is rotatably supported by a bearing 5 incorporated in the bearing cylinder 4.

  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 provided at the shaft end portion of the output shaft 2 and provided at the shaft end portion of the input shaft 1. A plurality of cam surfaces 14 are formed in the circumferential direction on the outer periphery of the inner ring 13, and a roller 15 and an elastic member 20 as a pair of engaging members are assembled between each of the plurality of cam surfaces 14 and the cylindrical surface 12. Is held by a cage 16, and the rotation of the inner ring 13 is transmitted to the outer ring 11 by engaging one of the rollers 15 with the cylindrical surface 12 and the cam surface 14 by rotating the inner ring 13 in one direction. When the inner ring 13 rotates in the other direction, the other roller 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.

  Here, a small-diameter concave portion 17 is formed on the inner surface side of the closed end portion of the outer ring 11, and the shaft end portion of the input shaft 1 is rotatably supported by a bearing 18 incorporated in the concave portion 17.

  The inner ring 13 is formed integrally with the input shaft 1. 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 has a wedge shape with narrow ends in the circumferential direction between the outer ring 11 and the cylindrical surface 12. A space is formed, and a flat spring support surface 19 facing the tangential direction of the inner ring 13 is provided between the pair of inclined surfaces 14 a and 14 b, and the elastic member 20 is supported by the spring support surface 19.

  The elastic member 20 consists of a coil spring. In the embodiment, as shown in FIG. 5, a coil spring having an oval cross section is employed. As shown in FIG. 3, the elastic member 20 is incorporated between a pair of rollers 15, and the elastic member 20 urges the pair of rollers 15 away from each other so that the cylindrical surface 12 and the cam It is disposed at a standby position that engages with the surface 14.

  As shown in FIGS. 1 to 3 and 6, the cage 16 includes a control cage 16 </ b> A and a rotary cage 16 </ b> B. The control retainer 16 </ b> A is provided with the same number of column portions 22 as the cam surface 14 at equal intervals in the circumferential direction on one outer peripheral portion of the annular flange 21, and an arc-shaped long hole 23 is formed between the adjacent column portions 22. The cylindrical portion 24 is provided on the outer periphery in the opposite direction to the column portion 22.

  On the other hand, the rotation cage 16B is configured such that the same number of column portions 26 as the cam surface 14 are provided at equal intervals in the circumferential direction on the outer periphery of the annular flange 25.

  The control retainer 16A and the rotation retainer 16B are a combination in which the column portions 26 of the rotation retainer 16B are inserted into the elongated holes 23 of the control retainer 16A, and the column portions 22 and 26 are alternately arranged in the circumferential direction. ing. In the combined state, the end portions of the column portions 22 and 26 are disposed between the outer ring 11 and the inner ring 13, and the flange 21 of the control holder 16 </ b> A and the flange 25 of the rotary holder 16 </ b> B are fitted to the outer periphery of the input shaft 1. The support ring 28 and the spring holder 33 are integrated.

  By incorporating the cages 16A and 16B as described above, as shown in FIGS. 2 and 3, a pocket 27 is formed between the column portion 22 of the control cage 16A and the column portion 26 of the rotary cage 16B. 27 is opposed to the cam surface 14 of the inner ring 13 in the radial direction, and a pair of opposed rollers 15 and an elastic member 20 are incorporated in each pocket 27.

  As shown in FIG. 1, the flange 21 of the control holder 16A and the flange 25 of the rotation holder 16B are slidably supported along a slide guide surface 29 formed on the outer periphery of the input shaft 1, and the rotation holder A thrust bearing 30 is incorporated between the 16B flange 25 and the support ring 28 fitted to the input shaft 1.

  The thrust bearing 30 rotatably supports the rotary cage 16B in a state that prevents the rotary cage 16B from moving to the electromagnetic clutch 50 side.

  As shown in FIGS. 1 and 6, between the flange 21 of the control holder 16A and the flange 25 of the rotary holder 16B, the movement of the control holder 16A in the axial direction is controlled between the control holder 16A and the rotary holder 16B. A torque cam 40 is provided as a motion converting mechanism that converts the relative rotational motion of the motor.

  As shown in FIGS. 7 (a) and 7 (b), the torque cam 40 gradually increases as it reaches both ends deeper in the center in the circumferential direction on the opposing surfaces of the flange 21 in the control holder 16A and the flange 25 in the rotary holder 16B. A pair of opposing cam grooves 41, 42 that are shallower are provided, and a ball 43 is incorporated between one end of one 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 21 of the control holder 16A approaches the flange 25 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 relatively rotated in the direction in which the circumferential width of the pocket 27 is reduced. .

  As shown in FIGS. 1, 4, and 5, a cylindrical holder fitting surface 32 having a diameter larger than that of the slide guide surface 29 is formed at the intersection of the axial end of the inner ring 13 and the slide guide surface 29. The spring holder 33 is fitted to the holder fitting surface 32 and abutted against one end surface of the inner ring 13 in the axial direction.

  As shown in FIGS. 4 and 8, the spring holder 33 has an engagement surface 34 at a position opposed to the inner periphery, and the engagement surface 34 engages with a flat surface 35 provided on the holder fitting surface 32. The spring holder 33 is prevented from rotating by the engagement, and is supported in a non-movable manner in the axial direction.

  On the outer periphery of the spring holder 33, positioning pieces 36 are provided that are respectively disposed inside a plurality of pockets 27 provided in the cage 16. The positioning piece 36 receives the column portion 22 of the control holder 16A and the column portion 26 of the rotation holder 16B by both side edges in the circumferential direction, and rotates the rotation angle in the disengagement direction of the control holder 16A and the rotation holder 16B. The roller 15 is prevented from moving to one end side of the inner ring 13.

  As shown in FIG. 5, the positioning piece 36 is provided with a spring support piece 37 that prevents the elastic member 20 from moving outward in the radial direction. In the spring support piece 37, an axial piece 37 b extending in the axial direction is continuously provided at the end of an arc-shaped portion 37 a formed on the side where the positioning piece 36 is provided, while maintaining a state parallel to the outer periphery of the inner ring 13. The above-mentioned axial piece 37b projects to the outer periphery of the elastic member 20 to prevent the elastic member 20 from moving radially outward, and the tip of the axial piece 37b is formed. An opening 38 that allows the elastic member 20 to be inserted is formed between the outer circumferential surface of the inner ring 13 and the inner ring 13.

  Here, when an edge is formed at the edge where the inner surface of the spring support piece 37 intersects the circumferential side surface, when the elastic member 20 contracts, the edge is caught and the elastic member 20 contracts smoothly. There is a possibility that it will not. In order to prevent such an inconvenience, a tapered surface 39 is provided at the edge where the inner surface of the spring support piece 37 intersects the circumferential side surface as shown in FIG.

  The spring holder 33 having the above configuration is a press-formed product of a steel plate.

  As shown in FIG. 5, a washer 45 is fitted to the shaft end portion of the input shaft 1 and abutted against the other side surface in the axial direction of the inner ring 13 to rotatably support the shaft end portion of the input shaft 1. The bearing 18 is held in an abutting state.

The outer diameter D ₀ of the washer 45 is larger than the diameter D ₁ of the virtual circle C connecting the centers of the plurality of elastic members 20, and the roller 15 and the elastic member 20 are connected to the other end side of the inner ring 13 by the washer 45. It is prevented from falling off.

  As shown in FIG. 1, the electromagnetic clutch 50 includes an armature 51 that faces the end face of the cylindrical portion 24 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 cylindrical outer diameter surface 54 of the support ring 28 and is rotatably and slidably supported. The armature 51 is controlled and held on the inner diameter surface of the connecting cylinder 55 provided on the outer periphery of the armature 51. The cylindrical portion 24 of the container 16A 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 28 and the slide guide surface 29 on the outer periphery of the input shaft 1.

  Here, the support ring 28 is fitted to the input shaft 1 and positioned in the axial direction, and is prevented from rotating with respect to the input shaft 1.

  The rotor 52 is fitted to the input shaft 1 and positioned in the axial direction, and is prevented from rotating with respect to the input shaft 1.

  The electromagnet 53 includes an electromagnetic coil 53a and a core 53b that supports the electromagnetic coil 53a. The core 53b is fitted in the other end opening of the housing 3 and is attached to the other end opening of the housing 3. It is secured by a ring 6. The core 53 b is rotatable relative to the input shaft 1 via a bearing 60 fitted to the input shaft 1.

  The rotation transmission device shown in the embodiment has the above-described structure, and in a state where power to the electromagnetic coil 53a of the electromagnetic clutch 50 shown in FIG. 1 is cut off, the roller 15 of the two-way clutch 10 has an outer ring as shown in FIG. 11 is engaged with the cylindrical surface 12 and the cam surface 14 of the inner ring 13.

  Therefore, when the input shaft 1 rotates in one direction, the rotation is transmitted from the inner ring 13 to the outer ring 11 through one of the pair of opposed rollers 15, and the output shaft 2 rotates in the same direction as the input shaft 1. When the input shaft 1 rotates in the opposite direction, the rotation is transmitted to the output shaft 2 via the other roller 15.

  When the electromagnetic coil 53a of the electromagnetic clutch 50 is energized while the two-way clutch 10 is engaged as described above, an attractive force acts on the armature 51, and the armature 51 moves in the axial direction and is attracted to the rotor 52.

  At this time, since the armature 51 and the control holder 16A are connected and integrated by fitting the connecting cylinder 55 and the cylinder portion 24, the control holder 16A moves along with the movement of the armature 51 in the axial direction. The flange 21 moves in a direction approaching the flange 25 of the rotary cage 16B.

  Due to the relative movement of the control holder 16A and the rotary holder 16B, the ball 43 shown in FIG. 7B is directed to the deepest position of the cam grooves 41 and 42 as shown in FIG. 7A. 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 27 decreases.

  Due to the relative rotation of the control holder 16A and the rotary holder 16B, the pair of opposed rollers 15 shown in FIG. 3 are pushed by the column portion 22 of the control holder 16A and the column portion 26 of the rotary holder 16B so that they are directed toward the neutral position. Move.

  The pair of opposed rollers 15 are disengaged from the cylindrical surface 12 and the cam surface 14, and the control retainer 16 </ b> A and the rotational retainer 16 </ b> B are further relative to each other in the direction in which the circumferential width of the pocket 27 decreases from the released state. When rotated, the pillars 22 and 26 of the cages 16A and 16B abut against both side edges of the positioning piece 36 of the spring holder 33 shown in FIG. Due to the contact, the control holder 16A and the rotation holder 16B are stopped, and the pair of opposed rollers 15 are held in the disengaged state.

  For this reason, even if the input shaft 1 rotates, the rotation is not transmitted to the output shaft 2, and the input shaft 1 rotates freely.

  When the energization of the electromagnetic coil 53a is released in the free rotation state of the input shaft 1, 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 20 in the direction in which the circumferential width of the pocket 27 is increased, and each of the pair of opposed rollers 15 has the cylindrical surface 12 and the cam. A standby state in which the surface 14 is engaged is set, and rotational torque in one direction 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 1 is stopped and the rotation direction of the input shaft 1 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 27 increases, 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 14, 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 27 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.

  As described above, when the electromagnetic clutch 50 is turned off, the two-way clutch 10 is engaged, and when the electromagnetic clutch 50 is turned on, the two-way clutch 10 is disengaged, which is extremely effective for applications requiring a fail-safe mechanism. is there.

  In the embodiment, the spring support piece 37 provided on the spring holder 33 and preventing the elastic member 20 from moving outward in the radial direction is formed as a plate piece projecting out to the outer periphery of the elastic member 20. By providing an opening 38 of a size that allows the elastic member 20 to be incorporated between the tip of 37 and the outer periphery of the inner ring 13, the elastic member 20 is placed in the opening 38 as shown in FIG. The elastic member 20 can be assembled between the spring support piece 37 and the opposed portion of the spring support surface 19 of the inner ring 13 by pushing the elastic member 20 into the opening 38 in a state of being opposed and contracted.

  At this time, since the elastic member 20 is incorporated along the lengths of the column portions 22 and 26 of the control retainer 16A and the rotation retainer 16B, the column portions 22 and 26 inhibit the incorporation of the elastic member 20. The elastic member 20 can be easily assembled without such a situation.

  Here, the pair of opposed rollers 15 may be assembled in the pocket 27 before the elastic member 20 is assembled, or may be assembled in the pocket 27 after the elastic member 20 is assembled. After the elastic member 20 and the roller 15 are assembled or simultaneously, a washer 45 is fitted to the shaft end portion of the input shaft 1.

  FIG. 9D shows the assembled state of the washer 45, and the assembly of the washer 45 prevents the elastic member 20 and the roller 15 from moving to the other side of the inner ring 13, and the input shaft 1 and the roller 15 The elastic member 20, the spring holder 33, and the washer 45 are an assembly. The assembly of the two-way clutch 10 is completed by inserting the assembly into the inside from the open end of the outer ring 11.

  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 column portions 22 and 26 are positioned between the outer ring 11 and the inner ring 13, and the flanges 21 and 25 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.

  In the rotation transmission device according to the embodiment, as the two-way clutch 10, the control holder 16A is moved in the axial direction by deenergizing the electromagnet 53, and the control holder 16A and the rotation holder 16B are rotated relative to each other. Although a roller type in which the roller 15 as a coupling is engaged with the inner periphery of the outer ring 11 and the outer periphery of the inner ring 13 is shown, the two-way clutch is not limited to this. For example, a pair of cages having different diameters are arranged on the inside and outside, and an outside cage having a large diameter is formed by a control cage and a rotary cage, and a pair of sprags as an engagement member is released by de-energizing the electromagnet of the electromagnetic clutch. Is engaged with the inner peripheral cylindrical surface of the outer ring and the outer peripheral cylindrical surface of the inner ring or the input shaft by an elastic member incorporated between the opposing portions, and the control retainer and the rotational retainer are relatively rotated by energizing the electromagnet. A sprag type that disengages a pair of sprags may be used.

1 Input shaft 2 Output shaft 10 Two-way clutch 11 Outer ring 13 Inner ring 15 Roller (engagement element)
16A Control retainer 16B Rotation retainer 22 Column 26 Column 27 Pocket 33 Spring holder 37 Spring support piece 38 Opening 39 Tapered surface 50 Electromagnetic clutch

Claims (5)

A two-way clutch that transmits and blocks rotation from an input shaft to an output shaft that is arranged coaxially with the input shaft, and an electromagnetic clutch that controls engagement and release of the two-way clutch;
The two-way clutch includes a plurality of column portions provided in a control cage between an inner periphery of an outer ring provided at a shaft end portion of the output shaft and an outer periphery of an inner ring provided at a shaft end portion of the input shaft. A plurality of pillars provided in the rotary cage are assembled so as to be alternately arranged in the circumferential direction to form a pocket between adjacent pillars, and a pair of opposing engagement elements are incorporated in the pocket, and the pair of engagements The structure is configured such that the elastic member is biased toward the direction of engaging the inner periphery of the outer ring and the outer periphery of the inner ring by an elastic member incorporated between the opposing portions.
A spring support piece for preventing the elastic member from moving radially outward is provided on the outer periphery of an annular spring holder that is abutted against one end surface of the inner ring on the outer ring opening side and rotates integrally with the input shaft,
In the rotation transmission device in which the control retainer and the rotation retainer are relatively rotated in a direction in which the circumferential width of the pocket is reduced by energizing the electromagnetic clutch, and the pair of opposed engagement elements are disengaged.
The spring support piece is in the form of a plate that extends in the axial direction and extends to the outer periphery of the elastic member while maintaining a state parallel to the outer periphery of the inner ring, and the elastic member between the tip of the spring support piece and the outer periphery of the inner ring A rotation transmission device characterized in that an opening having a size allowing insertion of the rotation is formed.   The rotation transmission device according to claim 1, wherein a tapered surface is provided at an edge where the inner surface and the circumferential side surface of the spring support piece intersect. The rotation transmission device according to claim 1 or 2 , wherein a washer is fitted to the input shaft and abutted against the other end surface of the inner ring to prevent the roller from moving to the other end side of the inner ring. The rotation transmission device according to claim 3 , wherein an outer diameter of the washer is larger than a diameter of an imaginary circle passing through the centers of the plurality of elastic members. It said elastic member is rotation transmission device according to any one of claims 1 to 4 consisting of elliptical cross section shape of the coil spring.

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