JP2014020439A - Rotation transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase transmission torque capacity of a rotation transmission apparatus for controlling a two-way clutch by an electromagnetic clutch.SOLUTION: A sprag type two-way clutch is adopted as a two-way clutch 10 which is configured so that a plurality of pillar parts 16b formed on a control holder 16 and a plurality of pillar parts 17b formed on a rotation holder 17 are integrated so as to be alternately arranged between a cylindrical surface 12 of an inner periphery of an outer ring 11 attached to a shaft end part of an output shaft and a cylindrical surface 14 of an outer periphery of an inner ring 13 attached to a shaft end part of an input shaft 1, pockets 19 are formed each between a pair of pillar parts adjacent to each other in a peripheral direction, and a pair of opposite sprags 15 to be oscillated around an inner end part and an elastic member 21 arranged between opposite parts of the sprags 15 are integrated in each of the pockets 19. The control holder 16 and the rotation holder 17 are relatively rotated by an electromagnetic clutch to engage/disengage the sprags 15.

Description

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

  In an FR-based four-wheel drive vehicle, a rotation transmission device that transmits and interrupts driving force to a front wheel as an auxiliary drive wheel has been conventionally known.

  In the rotation transmission device described in Patent Document 1, the control cage and the rotation cage are provided between the outer ring and the inner ring incorporated therein, and the column portions formed on the cages in the circumferential direction. Assembling them alternately, install a pair of opposed rollers in a pocket formed between adjacent pillars, and urge the pair of rollers away from each other by an elastic member built in between the opposed parts Then, it 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 moved to 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.

  In addition, 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 energizing the electromagnetic coil of the electromagnetic clutch, and 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 so that the circumferential width of the pocket is reduced by the action of the torque cam provided between them, and the pair of rollers are moved to the disengagement position at the pillar portion of each cage. The rotation transmission from the inner ring to the outer ring 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 the rotary cage rotate relative to each other in the direction in which the circumferential width of the pocket increases, 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 Patent Document 1, the two-way clutch whose engagement and release are controlled by the electromagnetic clutch is a roller type using an engagement element as a roller, so that the transmission torque capacity is small. Since it is relatively small and is often restricted by the use of the rotation transmission device, there are still points to be improved in order to eliminate such inconvenience.

  An object of the present invention is to increase the transmission torque capacity of a rotation transmission device that controls a two-way clutch with an electromagnetic clutch.

  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 has an inner peripheral cylindrical surface of the outer ring provided at the shaft end portion of the output shaft and an outer periphery of the inner ring provided at the shaft end portion of the input shaft. A plurality of column portions provided in the control cage and a plurality of column portions provided in the rotary cage are assembled so as to be alternately arranged in the circumferential direction between the cylindrical surfaces of A pocket is provided between the pillar portions, and a pair of opposed sprags that can swing around the inner end portion are incorporated in each of the pockets, and the opposed pair of sprags are assembled by an elastic member incorporated between the opposed portions. Cylindrical surface of outer ring and cylindrical surface of inner ring The sprag type is biased in the engaging direction, and the electromagnetic clutch is supported so as to be movable in the axial direction of the input shaft, the rotor facing the armature in the axial direction, and the rotor and the axial direction It consists of an electromagnet that is opposed and attracts the armature to the rotor by energization, and the control holder is connected to the armature, and the axial movement of the control holder is performed between the control holder and the rotary holder. A motion conversion mechanism that converts the control cage and the rotary cage into a relative rotational motion is provided. By energizing the electromagnet, the control cage and the rotary cage are rotated relative to each other in the direction in which the circumferential width of the pocket becomes smaller. A configuration in which the pair of sprags is disengaged is employed.

  In the rotation transmission device configured as described above, when the electromagnet of the electromagnetic clutch is energized, the armature is attracted to the rotor, and the control cage connected to the armature is set in the axial direction. The movement of the control holder in the axial direction is converted into a relative rotational movement between the control holder and the rotary holder by a motion conversion mechanism. At this time, since the control cage and the rotary cage rotate relative to each other in the direction in which the circumferential width of the pocket becomes smaller, the opposed pair of sprags are pressed by the pillars of both cages to be disengaged, and the input shaft Is not transmitted to the output shaft, and the input shaft rotates freely.

  Further, when energization of the electromagnet of the electromagnetic clutch is released, the pair of opposed sprags are pressed away from each other by the pressing of the elastic member, and the control retainer and the rotating retainer are moved in the direction in which the circumferential width of the pocket is increased by the pressing. The pair of sprags rotate relative to each other and engage the cylindrical surfaces of the outer ring and the inner ring. For this reason, when the input shaft rotates, the rotation is transmitted to the output shaft via the sprag, and the output shaft rotates in the same direction as the input shaft.

  In this way, when energization to the electromagnet is released, the pair of opposed sprags are immediately engaged, so there is no backlash in the rotational direction, the rotation of the input shaft can be immediately transmitted to the output shaft, and the response is excellent. ing. Further, since the two-way clutch uses the sprag as an engagement element, a large rotational torque can be transmitted between the input shaft and the output shaft, and a rotational transmission device having a large transmission torque capacity can be provided.

  Here, an inner cage that rotates integrally with the inner ring is provided inside the control cage and the rotary cage, and the inner end of the sprag is supported in a swingable manner by a pocket formed in the inner cage, The sprag can be smoothly swung around its inner end.

  In the rotation transmission device according to the present invention, as a motion conversion mechanism for converting the axial movement of the control cage into the relative rotational motion of the control cage and the rotary cage, one end portions of the plurality of column portions of the control cage A cam groove is provided on each of the opposing surfaces of the flange supporting the flange and one end of the plurality of column portions of the rotary cage, deeper in the center in the circumferential direction, and the groove depth gradually decreases toward both ends, A torque cam in which a ball is accommodated between the cam grooves can be employed.

  In the present invention, as described above, the use of a sprag type clutch having a sprag as an engaging element is limited as a two-way clutch whose engagement and disengagement is controlled by an electromagnetic clutch. Therefore, a rotation transmission device with a small transmission torque capacity can be obtained.

Longitudinal front 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 drawing which shows the other example of the slide guide part which supports an armature movably Sectional drawing which shows the other example of the slide guide part which supports an armature movably Sectional view along line V-V in FIG. (A) is sectional drawing which shows the engagement state of the sprag in a two-way clutch, (b) is sectional drawing which shows the disengagement state of a sprag Sectional view along line VII-VII in FIG. (c) is a cross-sectional view taken along line VIII-VIII in FIG. 7, and (d) is a cross-sectional view showing another example of an elastic member. Sectional view along line IX-IX in FIG. (E) is a cross-sectional view taken along line XX in FIG. 9, (d) is a cross-sectional view showing the operating state of (e). Sectional view along the line XI-XI in FIG. Sectional drawing along the XII-XII line of FIG.

  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 40 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 4 a incorporated in the bearing cylinder 4. A mounting flange 5 is provided outwardly at the other end of the housing 3.

  As shown in FIGS. 2 and 5, 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 of the output shaft 2 and provided at the shaft end of the input shaft 1. A cylindrical surface 14 is provided on the outer periphery of the inner ring 13, and the cylindrical surface 12, 14 is made of a sprag type in which a sprag 15 as an engagement element is engaged and released.

  Here, the sprag 15 has an outer end housed in a pocket described later formed by the control retainer 16 and the rotation retainer 17, and a pocket described later formed in the inner retainer 18. It is accommodated in the inside and is used as a swingable support.

  As shown in FIGS. 1 and 9, the control retainer 16 includes a plurality of arcuately arranged columnar portions 16b on the outer peripheral portion of one surface of the annular flange 16a, and an arcuate long hole 16c between adjacent columnar portions 16b. It is set as the structure which provided. On the other hand, as shown in FIG. 2, the rotary cage 17 has a configuration in which a plurality of column portions 17 b are provided at intervals in the circumferential direction on the outer peripheral portion of an annular flange 17 a.

  As shown in FIG. 1, the control holder 16 and the rotary holder 17 are configured such that the column portion 17 b of the rotation holder 17 is inserted into the elongated hole 16 c of the control holder 16, and the column portions 16 b and 17 b are in the circumferential direction. It is a combination that is alternately arranged. In the combined state, the end portions of the column portions 16b and 17b are disposed between the outer ring 11 and the inner ring 13, and the flange 16a of the control holder 16 and the flange 17a of the rotary holder 17 are provided on the outer periphery of the input shaft 1. Incorporation is located between the flange 6 and the outer ring 11.

  By incorporating the cages 16 and 17 as described above, a pocket 19 is formed between the column portion 16b of the control cage 16 and the column portion 17b of the rotary cage 17 as shown in FIGS. In the pocket 19, the outer ends of the pair of opposed sprags 15 are accommodated. Further, the inner end portion of the sprag 15 is accommodated in a pocket 20 formed in the inner cage 18 and is supported to be swingable.

  The pair of opposed sprags 15 are urged in opposite directions by the elastic member 21 incorporated between the opposed portions of the outer end portions thereof, and as shown in FIG. 13 is engaged with the cylindrical surface 14 and swings in the direction in which the outer end portions approach each other around the inner end portion accommodated in the pocket 20 from the engaged state. As shown in b), the engagement with the cylindrical surfaces 12 and 14 is released.

  Here, a circular coil spring is adopted as the elastic member 21, but a coil spring having a square cross section may be used as shown in FIG. 8C, or as shown in FIG. 8D. Alternatively, a coil spring having an oval cross section may be used.

  As shown in FIG. 6, the inner cage 18 is attached by press-fitting to the outer diameter surface of the inner ring 13 and rotates integrally with the inner ring 13. Further, as shown in FIG. 2, the inner ring 13 is serrated to the shaft end portion of the input shaft 1, rotates integrally with the input shaft 1, and is freely rotatable by a bearing 22 incorporated in the closed end portion of the outer ring 11. However, the inner ring 13 may be provided integrally with the input shaft 1.

  As shown in FIG. 2, the flange 16a of the control holder 16 and the flange 17a of the rotary holder 17 are slidably supported along a slide guide surface 23 formed on the outer periphery of the input shaft 1, and the rotary holder A thrust bearing 24 is incorporated between the 17 flanges 17 a and the flange 6 of the input shaft 1.

  Between the control holder 16 and the rotary holder 17, there is a motion conversion mechanism 30 that converts the axial movement of the control holder 16 into a relative rotational movement of the control holder 16 and the rotary holder 17. Is provided. Here, a torque cam is shown as the motion conversion mechanism 30.

  As shown in FIG. 2, FIG. 9 and FIG. 10 (e), the torque cam 30 serving as a motion conversion mechanism has a circumferential central portion on each of the opposing surfaces of the flange 16a of the control holder 16 and the flange 17a of the rotary holder 17. A pair of opposed cam grooves 31 and 32 that gradually become shallower toward both ends are provided, and a ball 33 is incorporated between one end of one cam groove 31 and the other end of the other cam groove 32.

  The cam grooves 31 and 32 are arc-shaped grooves here, but may be V-grooves.

  When the control holder 16 moves in the axial direction in a direction in which the flange 16a of the control holder 16 approaches the flange 17a of the rotary holder 17, as shown in FIG. Rolls toward the deepest groove depth of the cam grooves 31 and 32, and the control holder 16 and the rotary holder 17 are rotated relative to each other in the direction in which the circumferential width of the pocket 19 is reduced. .

  As shown in FIGS. 2 and 7, an annular holding plate 35 that is prevented from rotating with respect to the inner ring 13 is abutted on one side surface in the axial direction of the inner ring 13. On the outer peripheral surface of the holding plate 35, a plurality of detent pieces 36 are formed which are arranged in the respective pockets 19 between the column portion 16b of the control holder 16 and the column portion 17b of the rotary holder 17.

  When the control retainer 16 and the rotation retainer 17 are relatively rotated in the direction of reducing the circumferential width of the pocket 19, the plurality of detent pieces 36 are formed on the column 16 b of the control retainer 16 and the rotation retainer 17. The column portion 17b is received at both side edges and held in a neutral position where the pair of opposing sprags 15 are disengaged.

  As shown in FIG. 1, the electromagnetic clutch 40 includes an armature 41 that faces the flange 16a of the control retainer 16 in the axial direction, a rotor 42 that faces the armature 41 in the axial direction, and a rotor 42 that faces the rotor 42 in the axial direction. And an electromagnet 43.

  As shown in FIG. 2, the armature 41 is fitted to a slide guide surface 6 a formed on the outer periphery of the flange 6 of the input shaft 1 and is rotatably and slidably supported. 16 are connected. In this connection, here, a connecting cylinder 45 is provided on the outer periphery of the armature 41, and a cylinder portion 16 d provided on the outer periphery of the flange 16 a of the control retainer 16 is press-fitted into the inner diameter surface of the connecting cylinder 45.

  As described above, the armature 41 and the control holder 16 are connected by press-fitting the cylinder portion 16d provided on the outer periphery of the flange 16a of the control holder 16 into the connecting cylinder 45 provided on the outer circumference of the armature 41. The armature 41 is slidably supported at two locations in the axial direction of the slide guide surface 6 a on the outer periphery of the flange 6 and the slide guide surface 23 on the outer periphery of the input shaft 1.

  The rotor 42 is fitted to the input shaft 1, a positioning ring 46 is provided between the rotor 42 and the flange 6 provided on the outer periphery of the input shaft 1, and the rotor 42 is positioned in the axial direction. On the other hand, it is prevented from rotating.

  As shown in FIG. 1, the electromagnet 43 includes an electromagnetic coil 43 a and a core 43 b that supports the electromagnetic coil 43 a, and the core 43 b is fitted into the opening of the other end of the housing 3. It is prevented from being pulled out by a retaining ring 47 attached in the end opening. The core 43 b is rotatable relative to the input shaft 1 via a bearing 48 fitted to the input shaft 1.

  As shown in FIG. 11 and FIG. 12, the core 43 b is fitted so that it fits almost exactly in the opening of the housing 3, and also serves as a cover. Further, a protruding portion 49 is provided on the outer periphery of the core 43b, and the protruding portion 49 is fitted into a detent groove 50 formed on the inner periphery of the other end opening of the housing 3, and the core 43b is fitted by the fitting. The lead wire (not shown) that is prevented from rotating and pulled out from the electromagnetic coil 43a is twisted so as not to be disconnected.

  As shown in FIG. 1, a dust cover 51 is fitted to the end portion of the output shaft 2 located outside the bearing tube 4 of the housing 3. The dust cover 51 is provided with a disk portion 53 that is axially opposed to the end surface of the bearing cylinder 4 at one end of a cylindrical portion 52 that is fitted to the outer diameter surface of the output shaft 2, and a bearing is provided on the outer periphery of the disk portion 53. The cylindrical portion 54 that covers the outer periphery of the end portion of the cylinder 4 is provided to prevent foreign matter from entering the bearing cylinder 4.

  The rotation transmission device shown in the embodiment has the above-described structure, and FIG. 1 shows a cut-off state of the electromagnet 43 with respect to the electromagnetic coil 43a, and the armature 41 is separated from the rotor 42. Further, as shown in FIG. 6A, the pair of opposed sprags 15 of the two-way clutch 10 are located at standby positions that engage with the cylindrical surface 12 of the outer ring 11 and the cylindrical surface 14 of the inner ring 13. .

  When the electromagnetic coil 43 a is energized in the standby state of the two-way clutch 10, an attractive force acts on the armature 41, and the armature 41 moves in the axial direction and is attracted to the rotor 42.

  Here, since the armature 41 is connected and integrated with the control holder 16, the flange 16 a of the control holder 16 approaches the flange 17 a of the rotary holder 17 as the armature 41 moves in the axial direction. Move in the direction.

  At this time, as shown in FIG. 10 (f), the ball 33 shown in FIG. 10 (e) rolls and moves toward the deepest groove depth of the cam grooves 31, 32, and rotates and holds the control holder 16 The container 17 relatively rotates in the direction in which the circumferential width of the pocket 19 decreases, and the pair of opposed sprags 15 shown in FIG. 6A are pushed by the column part 16b of the control holder 16 and the column part 17b of the rotation holder 17. And move toward each other. Therefore, as shown in FIG. 6B, the sprag 15 is disengaged from the outer ring cylindrical surface 12 and the inner ring cylindrical surface 14 to be in a neutral state, and the two-way clutch 10 is in a disengaged state.

  In the disengaged state of the two-way clutch 10, when rotational torque is input to the input shaft 1 and the inner ring 13 is rotated in one direction, the detent piece 36 formed on the holding plate 35 is fixed to the column portion 16 b of the control cage 16. In order to press one of the column portions 17b of the rotary cage 17, the control cage 16 and the rotary cage 17 rotate together with the inner ring 13. At this time, since the pair of opposed sprags 15 are 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 16 and the rotary holder 17 are relatively rotated in the direction of decreasing the circumferential width of the pocket 19, the column portion 16 b of the control holder 16 and the column portion 17 b of the rotary holder 17 are The amount of relative rotation is regulated by coming into contact with both side edges of the anti-rotation piece 36.

  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 43a is canceled in the free rotation state of the inner ring 13, the armature 41 is released from the suction and becomes rotatable. By releasing the suction, the control holder 16 and the rotary holder 17 are relatively rotated by the pressing of the elastic member 21 in the direction in which the circumferential width of the pocket 19 is increased, and each of the pair of opposed sprags 15 is shown in FIG. As shown in FIG. 2, the standby state is engaged with the outer ring cylindrical surface 12 and the inner ring cylindrical surface 14, and a unidirectional rotational torque is transmitted between the inner ring 13 and the outer ring 11 through one of a pair of opposed sprags 15. Is done.

  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 sprag 15.

  As described above, when the energization of the electromagnetic coil 43a is interrupted, the control retainer 16 and the rotation retainer 17 are relatively rotated in the direction in which the circumferential width of the pocket 19 is increased, and each of the pair of opposed sprags 15 is the outer ring cylindrical surface. 12 and the inner ring cylindrical surface 14 are immediately put into a standby state, so that there is no backlash in the rotation direction, and the rotation of the inner ring 13 can be immediately transmitted to the outer ring 11.

  Further, since the transmission of the rotational torque from the inner ring 13 to the outer ring 11 is performed via the plurality of sprags 15, a large rotational torque can be transmitted from the inner ring 13 to the outer ring 11.

  When the control retainer 16 and the rotation retainer 17 are relatively rotated in the direction in which the circumferential width of the pocket 19 is increased, the ball 33 rolls and moves toward the shallow groove portion of the pair of opposed cam grooves 31 and 32. 10 (e).

  In the embodiment shown in FIG. 1, the control retainer 16 and the rotation retainer 17 are configured such that their column portions 16 b and 17 b are positioned between the outer ring 11 and the inner ring 13, and flanges 16 a and 17 a that are axially opposed to each other are Since it is incorporated between the armatures 41, the axial length of the outer ring 11 can be reduced in size and weight.

  Further, the connecting cylinder 45 provided on the armature 41 and the cylinder part 16 d formed on the outer peripheral part of the flange of the control retainer 16 are integrated as press-fitting, and the inner diameter surface of the armature 41 is integrated with the outer periphery of the flange 6 of the input shaft 1. By slidably supporting the slide guide surface 6a formed on the surface and supporting the inner diameter surface of the flange 16a of the control holder 16 movably by the slide guide surface 23 formed on the outer periphery of the input shaft 1, The armature 41 can always be held parallel to the rotor 42, and the armature 41 can be reliably magnetically attracted to the rotor 42 by energizing the electromagnet 43. For this reason, the sprag 15 can be engaged and disengaged with high accuracy.

  Here, when the input shaft 1 is formed of a nonmagnetic metal, a small electromagnet 43 can be employed to prevent magnetic flux from leaking from the armature 41 to the input shaft 1.

  The input shaft 1 is made of magnetic metal, and instead of the flange 6 provided integrally with the input shaft 1, a non-magnetic metal ring 7 is fitted as shown in FIG. As shown, the resin ring 8 may be fitted to prevent leakage of magnetic flux.

  When the resin ring 8 is used, the sliding resistance of the armature 41 can be achieved by using a self-lubricating resin such as polyacetal (POM), polyamide (PA), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), etc. The armature 41 can be smoothly moved in the axial direction.

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 10 Two-way clutch 11 Outer ring 12 Cylindrical surface 13 Inner ring 14 Cylindrical surface 15 Sprag 16 Control retainer 16a Flange 16b Column 17 Rotating cage 17a Flange 17b Column 18 Inner cage 19 Pocket 20 Pocket 30 Torque cam (Motion conversion mechanism)
31 Cam groove 32 Cam groove 33 Ball 40 Electromagnetic clutch 41 Armature 42 Rotor 43 Electromagnet

Claims (4)

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 is provided in a control holder between an inner peripheral cylindrical surface of the outer ring provided at the shaft end portion of the output shaft and an outer peripheral cylindrical surface of the inner ring provided at the shaft end portion of the input shaft. A plurality of pillars provided on the rotary cage and a plurality of pillars provided on the rotary cage are assembled so as to be alternately arranged in the circumferential direction, and a pocket is provided between a pair of pillars adjacent in the circumferential direction. A pair of opposed sprags that can swing around the inner end portion is incorporated in each of the two, and the pair of opposed sprags are engaged with the cylindrical surface of the outer ring and the cylindrical surface of the inner ring by elastic members incorporated between the opposed portions. It is a sprag type energized in the direction to join,
An armature in which the electromagnetic clutch is supported so as to be movable in the axial direction of the input shaft; a rotor that faces the armature in the axial direction; an electromagnet that faces the rotor in the axial direction and attracts the armature to the rotor by energization; Consists of
The control cage is connected to the armature, and the movement of the control cage in the axial direction is converted between the control cage and the rotary cage into the relative rotational motion of the control cage and the rotary cage. A rotation transmission device provided with a conversion mechanism, wherein when the electromagnet is energized, the control retainer and the rotation retainer are relatively rotated in a direction in which the circumferential width of the pocket is reduced to disengage the pair of opposed sprags.   An inner retainer that rotates integrally with the inner ring is provided inside the control retainer and the rotation retainer, and the inner end of the sprag is supported in a swingable manner by a pocket formed in the inner retainer. The rotation transmission device according to 1.   The rotation transmission device according to claim 2, wherein the inner cage is press-fitted into the inner ring.   The motion conversion mechanism is deep in the center in the circumferential direction on each of the opposing surfaces of the flange supporting one end of the plurality of pillars of the control cage and the flange supporting one end of the plurality of pillars of the rotary cage. The rotation transmission device according to any one of claims 1 to 3, further comprising a cam cam provided with a cam groove in which the groove depth gradually decreases toward both ends, and a ball is accommodated between the cam grooves.

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