JP2015194192A - Rotation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation transmission device which is excellent in the reliability of an operation for switching the transmission and block of rotation between an outer ring and an inner ring.SOLUTION: In a rotation transmission device having an axial movement device 30 which relatively moves a first split cage 4A and a second split cage 4B to an axial direction, and a motion conversion mechanism 31 which converts the relative movement of the first split cage 4A and the second split cage 4B in the axial direction to relative rotation, the motion conversion mechanism 31 is composed of: opposing faces 43A, 43B in a radial direction which are formed at the first split cage 4A and the second split cage 4B, respectively; a first spiral groove 44A which is formed at the opposing face 43A of the first split cage 4A; a second spiral groove 44B which is formed at the opposing face 43B of the second split cage 4B; and balls 45 which are assembled between the first spiral groove 44A and the second spiral groove 44B.

Description

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

  As a rotation transmission device used for switching between a state in which rotation is transmitted from an input shaft to an output shaft and a state in which transmission of the rotation is cut off, for example, the one described in Patent Document 1 is known.

  The rotation transmission device described in Patent Document 1 is incorporated so as to face the outer ring, an inner ring disposed inside the outer ring, a cylindrical surface on the inner periphery of the outer ring, and a cam surface on the outer periphery of the inner ring so as to face each other in the circumferential direction. A pair of rollers, an elastic member that presses each roller in a direction in which the distance between the pair of rollers is increased, and a roller holder that holds the pair of rollers.

  The roller holder includes a first divided holder and a second divided holder that are supported so as to be relatively rotatable. The first split holder and the second split holder individually support the pair of rollers so that the distance between the pair of rollers changes according to the relative rotation of the first split holder and the second split holder. An engagement position for engaging each roller between the inner peripheral cylindrical surface of the outer ring and the outer peripheral cam surface of the outer ring by widening the interval, and an inner peripheral cylinder of the outer ring by reducing the distance between the pair of rollers Relative rotation is possible between the surface and the disengagement position where the rollers are disengaged from the cam surface on the outer periphery of the inner ring.

  In addition, the rotation transmission device includes an electromagnet that moves one of the first split holder and the second split holder in the axial direction, and the first split holder and the second split holder in the axial direction. And a ball cam mechanism that converts the relative movement in the axial direction into the relative rotation of the first divided holder and the second divided holder when the relative movement is performed.

  The ball cam mechanism includes an axial facing surface provided on each of the split holders so as to face each other between the first split holder and the second split holder, and the first split holder. A first inclined groove formed to extend in the circumferential direction on an axially facing surface of the second split cage, and an axially facing surface of the second split cage with respect to the first split cage. The second inclined groove formed so as to extend in the direction, and a ball incorporated between the first inclined groove and the second inclined groove. The first inclined groove is formed to have a groove bottom that is inclined so that the groove depth gradually increases in the circumferential direction, and the second inclined groove has a groove depth opposite to the circumferential direction. It is formed so as to have a groove bottom inclined so as to gradually become deeper in the direction.

  Then, when the first split cage and the second split cage are relatively moved in the axial direction by energization of the electromagnet, the ball between the first tilted groove and the second tilted groove becomes the groove bottom of the tilted groove. By rolling in a deeper direction, the first split holder and the second split holder are rotated relative to each other, and the first split holder and the second split holder are disengaged from the engaged position to the disengaged position. Move to.

Japanese Patent Application Laid-Open No. 2014-9721

  However, it is difficult for the above-described rotation transmission device to completely eliminate the possibility of the ball falling off the ball cam mechanism. In other words, the above-described rotation transmission device includes a first divided holder and a second divided holder as a mechanism for converting the relative movement in the axial direction of the first divided holder and the second divided holder into relative rotation. A ball cam mechanism incorporating a ball between the opposing surfaces in the axial direction is adopted. Here, since the first divided holder and the second divided holder are supported so as to be relatively movable in the axial direction, the first divided holder and the second divided holder for some reason. May move out of the space between the first split holder and the second split holder when they move relative to each other in the axial direction without relative rotation. If the ball falls off, the operation for switching between transmission and interruption of rotation between the outer ring and the inner ring cannot be performed.

  The problem to be solved by the present invention is to provide a rotation transmission device that is excellent in the reliability of the operation for switching between transmission and interruption of rotation between the outer ring and the inner ring.

In order to solve the above problems, in the present invention, the following configuration is employed in the rotation transmission device.
Outer ring,
An inner ring disposed inside the outer ring and supported to be rotatable relative to the outer ring;
A pair of engagement elements incorporated so as to oppose each other in the circumferential direction between an inner circumference of the outer ring and an outer circumference of the inner ring;
A first division supported so as to be relatively rotatable between an engagement position for engaging the pair of engagement elements between the outer ring and the inner ring and an engagement release position for releasing the engagement of the engagement elements. A cage and a second split cage;
An axial movement device for relatively moving the first divided holder and the second divided holder in the axial direction;
When the first split cage and the second split cage move relative to each other in the axial direction, the relative movement in the axial direction is converted into relative rotation between the first split cage and the second split cage. A rotation transmission device having a motion conversion mechanism for
The motion conversion mechanism is
Radial facing surfaces respectively provided on both split holders so as to face each other in the radial direction between the first split holder and the second split holder;
A first spiral groove formed on the facing surface of the first split holder with respect to the second split holder to extend in a circumferential direction with respect to the axial direction;
A second spiral groove formed on the facing surface of the second split holder with respect to the first split holder so as to extend in the same direction as the first spiral groove;
A rotation transmission device comprising a ball incorporated between the first spiral groove and the second spiral groove.

  In this way, as a mechanism for converting the relative movement in the axial direction of the first split holder and the second split holder into relative rotation, the axial direction of the first split holder and the second split holder Since a mechanism in which a ball is incorporated in a spiral groove between the opposing surfaces in the radial direction is adopted instead of a mechanism in which the ball is incorporated in the inclined groove between the opposing surfaces, the first split cage and the second split cage The first split holder and the second split holder are not only moved relative to one axial direction but also moved relative to the other axial direction by the ball guiding action by the spiral groove. And relative rotation. Therefore, there is no possibility that the first divided holder and the second divided holder are relatively moved in the axial direction without relative rotation, and there is no possibility that the ball falls off. Therefore, the reliability of the operation | movement which switches transmission and interruption | blocking of rotation between an outer ring | wheel and an inner ring | wheel is high.

This rotation transmission device is preferably added with the following configuration.
The first spiral groove is provided at three or more locations at intervals in the circumferential direction,
The second spiral grooves are provided at three or more locations at intervals in the circumferential direction at positions radially opposed to the first spiral grooves.
The balls are incorporated between the respective first and second spiral grooves.

  In this way, the axial relative movement of the first split holder and the second split holder is converted into relative rotation by three or more spiral grooves and balls positioned at intervals in the circumferential direction. When the first split holder and the second split holder are relatively moved, the postures of both split holders are stabilized, and the relative movement of both split holders is also smooth.

As the axial movement device, for example, the following configuration can be adopted.
An armature connected to one of the first split holder and the second split holder so as to move integrally in the axial direction; and a rotor disposed to face the armature in the axial direction; An axial movement device comprising an electromagnet that attracts an armature to a rotor by energization.

  The rotation transmission device according to the present invention is a spiral groove between radially opposed surfaces of both split cages as a mechanism for converting the relative movement in the axial direction of the first split cage and the second split cage into relative rotation. Since a mechanism incorporating a ball is adopted, the first split holder and the second split holder move relative to each other in the axial direction as well as relative to each other in the axial direction. Sometimes, the first split cage and the second split cage rotate relative to each other by the ball guiding action by the spiral groove. Therefore, there is no possibility that the first divided holder and the second divided holder are relatively moved in the axial direction without relative rotation, and there is no possibility that the ball falls off. Therefore, the reliability of the operation | movement which switches transmission and interruption | blocking of rotation between an outer ring | wheel and an inner ring | wheel is high.

Sectional drawing which shows the rotation transmission apparatus concerning embodiment of this invention Sectional view along the line II-II in FIG. Sectional drawing which expands and shows the vicinity of a pair of roller which opposes the circumferential direction on both sides of the elastic member 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. FIG. 6 is an enlarged sectional view in the vicinity of the motion conversion mechanism shown in FIG. FIG. 1 is an enlarged sectional view in the vicinity of the motion conversion mechanism shown in FIG. (A) is a development view of the motion conversion mechanism shown in FIG. 8 viewed in the axial direction, and (b) is a development view of the motion conversion mechanism shown in FIG. 8 viewed from the outer diameter side. The expanded sectional view of the vicinity of the motion conversion mechanism when the second split cage shown in FIG. 8 moves in the axial direction away from the inner ring. (A) is a development view of the motion conversion mechanism shown in FIG. 10 viewed in the axial direction, and (b) is a development view of the motion conversion mechanism shown in FIG. 10 as seen from the outer diameter side. 1 is an exploded perspective view of the first divided holder and the second divided holder shown in FIG.

  FIG. 1 shows a rotation transmission device according to an embodiment of the present invention. The rotation transmission device includes an outer ring 1, an inner ring 2 disposed inside the outer ring 1, a plurality of rollers 3 a and 3 b incorporated between the inner circumference of the outer ring 1 and the outer circumference of the inner ring 2, and these rollers And a roller holder 4 for holding 3a and 3b. An input shaft 5 is connected to the inner ring 2, and an output shaft 6 is connected to the outer ring 1. The input shaft 5 and the output shaft 6 are arranged coaxially.

  The input shaft 5 and the inner ring 2 are formed as a seamless integral member so that both rotate together. The input shaft 5 and the inner ring 2 may be formed as separate members and connected to each other by serration fitting or the like.

  The output shaft 6 and the outer ring 1 are also formed as a seamless integral member so that both rotate integrally. The output shaft 6 and the outer ring 1 may be formed as separate members and connected to each other by serration fitting or the like. A rolling bearing 9 is incorporated between the outer ring 1 and the inner ring 2 to support the inner ring 2 so as to be rotatable relative to the outer ring 1. A rolling bearing 11 that rotatably supports the output shaft 6 is incorporated in an end portion on the output shaft 6 side of the cylindrical housing 10 that houses the constituent members of the rotation transmission device.

  As shown in FIGS. 2 and 3, a plurality of cam surfaces 12 are provided on the outer periphery of the inner ring 2 at equal intervals in the circumferential direction. The cam surface 12 includes a front cam surface 12a and a rear cam surface 12b disposed on the rear side in the forward rotation direction of the inner ring 2 with respect to the front cam surface 12a. A cylindrical surface 13 that is opposed to the cam surface 12 in the radial direction is provided on the inner periphery of the outer ring 1.

  Between the cam surface 12 and the cylindrical surface 13, a pair of rollers 3 a and 3 b that are opposed to each other in the circumferential direction with the elastic member 14 interposed therebetween are incorporated. Of the pair of rollers 3a and 3b, the forward roller 3a in the forward rotation direction is incorporated between the front cam surface 12a and the cylindrical surface 13, and the rear roller 3b in the forward rotation direction is the rear cam surface 12b and the cylindrical surface 13. Is built in between. Between the pair of rollers 3a and 3b, an elastic member 14 that presses each of the rollers 3a and 3b in a direction to widen the distance between the pair of rollers 3a and 3b is incorporated.

  The front cam surface 12a is formed such that the radial distance from the cylindrical surface 13 gradually decreases from the position of the roller 3a toward the front in the forward rotation direction. The rear cam surface 12b is formed such that the radial distance from the cylindrical surface 13 gradually decreases from the position of the roller 3b toward the rear in the forward rotation direction. In the figure, the front cam surface 12a and the rear cam surface 12b are formed so as to be separate planes inclined in opposite directions, but the front cam surface 12a and the rear cam surface 12b are forwardly rotated in a single plane. It is also possible to form on the same plane so that the front portion in the direction becomes the front cam surface 12a and the rear portion becomes the rear cam surface 12b. Further, the front cam surface 12a and the rear cam surface 12b can be curved surfaces. However, if the front cam surface 12a and the rear cam surface 12b are flat as shown in the figure, the processing cost can be reduced.

  As shown in FIGS. 1 to 3, the roller holder 4 is a first divided holder 4 </ b> A that supports one roller 3 a of a pair of rollers 3 a and 3 b that are opposed to each other in the circumferential direction with an elastic member 14 therebetween. And a second divided holder 4B that supports the other roller 3b. The first divided holder 4A and the second divided holder 4B are supported so as to be rotatable relative to each other, and the pair of rollers 3a, 3b is changed so that the distance between the pair of rollers 3a, 3b changes according to the relative rotation. Are supported individually.

  4 A of 1st division | segmentation holder | retainers have the some cylindrical part 15a arrange | positioned at intervals in the circumferential direction, and the cyclic | annular inner connection ring 16a which connects the edge parts of these pillar parts 15a. Similarly, the 2nd division | segmentation holder | retainer 4B also has the some pillar part 15b arrange | positioned at intervals in the circumferential direction, and the cyclic | annular outer connection ring 16b which connects the edge parts of these pillar parts 15b. . The inner connecting ring 16a is arranged radially inward with respect to the column part 15a, and the outer connecting ring 16b is arranged radially outside with respect to the column part 15b.

  The column portion 15a of the first divided holder 4A and the column portion 15b of the second divided holder 4B sandwich the pair of rollers 3a and 3b facing each other in the circumferential direction with the elastic member 14 in between. Thus, it is inserted between the inner periphery of the outer ring 1 and the outer periphery of the inner ring 2.

  As shown in FIG. 1, a ring-shaped flange 17 is fixedly provided on the radially inner side of the column portion 15b of the second split cage 4B. The flange 17 may be formed integrally with the pillar portion 15b, or a flange 17 separate from the pillar portion 15b may be inserted and fixed to the inner diameter side of the pillar portion 15b (see FIG. 12). The flange 17 is disposed so as to face the inner connecting ring 16a in the axial direction so that the flange 17 is closer to the inner ring 2 than the inner connecting ring 16a.

  The inner circumference of the inner connecting ring 16a of the first split cage 4A and the inner circumference of the flange 17 of the second split cage 4B are rotatably supported by a cylindrical surface 18 provided on the outer circumference of the input shaft 5. Has been. As a result, the first divided holder 4A and the second divided holder 4B engage each roller 3a, 3b between the cylindrical surface 13 and the cam surface 12 by widening the distance between the pair of rollers 3a, 3b. Between the engagement position to be combined and the engagement release position for releasing the engagement of each roller 3a, 3b between the cylindrical surface 13 and the cam surface 12 by narrowing the distance between the pair of rollers 3a, 3b. Relative rotation is possible. The inner connecting ring 16a of the first split cage 4A is supported in the axial direction by an annular protrusion 20 provided on the outer periphery of the input shaft 5 via a thrust bearing 19, thereby restricting movement in the axial direction. Yes. In the drawing, the annular protrusion 20 is an annular body that is non-movably attached to the outer periphery of the input shaft 5 in the axial direction.

  As shown in FIG. 4, a side plate 21 is fixed to the side surface of the inner ring 2. The side plate 21 has a stopper piece 22 positioned between both pillar portions 15a and 15b that are opposed to each other in the circumferential direction with the pair of rollers 3a and 3b interposed therebetween. In the stopper piece 22, when both the pillar portions 15a and 15b are moved in the direction of narrowing the distance between the pair of rollers 3a and 3b, the edges on both sides of the stopper piece 22 receive the pillar portions 15a and 15b. This prevents the elastic member 14 between the pair of rollers 3a and 3b from being excessively compressed and broken, and each roller 3a to the inner ring 2 when the distance between the pair of rollers 3a and 3b is narrowed. It is possible to make the position of 3b constant.

  As shown in FIG. 5, the side plate 21 has a spring holding piece 23 that holds the elastic member 14. The spring holding piece 23 is formed integrally with the stopper piece 22 so as to extend in the axial direction between the inner circumference of the outer ring 1 and the outer circumference of the inner ring 2. The spring holding piece 23 is disposed so as to face the spring support surface 24 (see FIG. 2) formed between the front cam surface 12a and the rear cam surface 12b on the outer periphery of the inner ring 2 in the radial direction. A concave portion 25 that accommodates the elastic member 14 is formed on the surface of the spring holding piece 23 that faces the spring support surface 24. The elastic member 14 is a coil spring. The spring holding piece 23 prevents the elastic member 14 from dropping in the axial direction from between the inner periphery of the outer ring 1 and the outer periphery of the inner ring 2 by restricting the movement of the elastic member 14 by the recess 25. .

  As shown in FIG. 1, the rotation transmission device includes an axial movement device 30 that relatively moves the first divided holder 4A and the second divided holder 4B in the axial direction, the first divided holder 4A, and the first divided holder 4A. When the two split cages 4B move relative to each other in the axial direction, a motion conversion mechanism 31 is provided that converts the relative movement in the axial direction into relative rotation of the first split cage 4A and the second split cage 4B. . The axial direction moving device 30 includes an armature 32 connected to the second split holder 4B, a rotor 33 disposed so as to face the armature 32 in the axial direction, and an electromagnet 34 that attracts the armature 32 to the rotor 33 by energization. It consists of.

  The armature 32 includes an annular disk portion 35 and a cylindrical portion 36 that is integrally formed so as to extend in the axial direction from the outer periphery of the disk portion 35. The cylindrical portion 36 of the armature 32 is fitted to the outer periphery of the outer connecting ring 16b of the second split holder 4B with a tightening margin. By this fitting, the armature 32 and the second split holder 4B are axially connected. Are connected to the second split holder 4B so as to move together. The armature 32 is supported by a cylindrical surface 37 provided on the outer periphery of the input shaft 5 so as to be rotatable and movable in the axial direction. Here, the armature 32 is supported by the armature 32 so as to be movable in the axial direction at two locations separated in the axial direction (that is, the inner circumference of the armature 32 and the inner circumference of the second split cage 4B). Is prevented from tilting with respect to the direction perpendicular to the axis.

  The rotor 33 is disposed between the armature 32 and the electromagnet 34. Further, the rotor 33 is supported on the outer periphery of the input shaft 5 so as not to move relative to either the axial direction or the circumferential direction by fitting to the outer periphery of the input shaft 5 with a tightening margin. The rotor 33 and the armature 32 are made of a ferromagnetic metal.

  The electromagnet 34 includes a solenoid coil 39 and a field core 40 around which the solenoid coil 39 is wound. The field core 40 is inserted into the end portion of the housing 10 on the input shaft 5 side and is prevented from being detached by a retaining ring 41. A rolling bearing 42 that rotatably supports the input shaft 5 is attached to the field core 40. The electromagnet 34 energizes the solenoid coil 39 to form a magnetic path that passes through the field core 40, the rotor 33, and the armature 32, and attracts the armature 32 to the rotor 33.

  As shown in FIGS. 6 to 9, the motion conversion mechanism 31 is provided to each of the split cages 4A and 4B so as to face the radial direction between the first split cage 4A and the second split cage 4B. Provided radial facing surfaces 43A and 43B, a first spiral groove 44A formed on the facing surface 43A of the first divided holder 4A with respect to the second divided holder 4B, and a second divided holder It consists of a second spiral groove 44B formed on the facing surface 43B of the 4B first split cage 4A and a ball 45 incorporated between the first spiral groove 44A and the second spiral groove 44B.

  The first spiral groove 44A extends while being inclined in the circumferential direction with respect to the axial direction. The inclination angle (that is, the lead angle) with respect to the circumferential direction of the first spiral groove 44A can be set to about 15 ° to 25 °, for example. The second spiral groove 44B extends in the same direction as the first spiral groove 44A (that is, a direction parallel to the first spiral groove 44A), and has the same lead angle as the first spiral groove 44A. Yes.

  The first spiral groove 44A and the second spiral groove 44B are formed in a circular arc shape so that the ball 45 can smoothly roll between the first spiral groove 44A and the second spiral groove 44B. . The first spiral groove 44A is formed such that the groove depth is constant along the longitudinal direction (spiral direction) of the groove. The second spiral groove 44B is also formed so that the groove depth is constant along the longitudinal direction of the groove. The ball 45 is disposed so as to be sandwiched between the inner surface of the first spiral groove 44A and the inner surface of the second spiral groove 44B.

  As shown in FIGS. 9A and 9B, the first spiral groove 44A has a shape in which both ends in the longitudinal direction are closed so that the ball 45 does not roll out from both ends of the first spiral groove 44A. . The second spiral groove 44B has a shape in which one end is closed and the other end is opened.

  As shown in FIG. 6, the first spiral grooves 44A are provided at three or more locations (three locations in this embodiment) at intervals in the circumferential direction. The second spiral grooves 44B are provided at three or more locations (three locations in this embodiment) at intervals in the circumferential direction at positions radially opposed to the first spiral grooves 44A. Here, the first spiral groove 44A and the second spiral groove 44B are both arranged at equal intervals in the circumferential direction in the cross section perpendicular to the axis.

  When the second split cage 4B shown in FIGS. 8 and 9A and 9B is moved in the axial direction away from the inner ring 2, the motion conversion mechanism 31 is shown in FIGS. 10 and 11A. As shown in (b), the first split holder 4A and the second split holder 4B are spiraled by the guiding action of the ball 45 rolling between the first spiral groove 44A and the second spiral groove 44B. The grooves 44A and 44B are moved relative to each other in the extending direction. As a result, the first divided holder 4A and the second divided holder 4B rotate relative to each other in the direction in which the interval between the column portions 15a and 15b sandwiching the pair of rollers 3a and 3b is narrowed. In addition, when the second split cage 4B shown in FIGS. 10 and 11 (a) and 11 (b) moves in the axial direction in the direction approaching the inner ring 2, the motion conversion mechanism 31 is shown in FIGS. a) As shown in (b), by the guiding action of the ball 45 rolling between the first spiral groove 44A and the second spiral groove 44B, the first split holder 4A and the second split holder 4B Are moved relative to each other in the extending direction of the spiral grooves 44A, 44B. As a result, the first divided holder 4A and the second divided holder 4B rotate relative to each other in the direction in which the interval between the column portions 15a and 15b sandwiching the pair of rollers 3a and 3b increases.

  The armature 32 is urged away from the rotor 33 by the force of the elastic member 14. That is, the force by which the elastic member 14 shown in FIG. 2 presses each of the rollers 3a and 3b in the direction of increasing the distance between the pair of rollers 3a and 3b is transmitted to the first divided holder 4A and the second divided holder 4B. To do. The circumferential force received by the first divided holder 4A and the second divided holder 4B is converted into an axial force in a direction away from the rotor 33 by the motion converting mechanism 31 shown in FIGS. Then, it is transmitted to the second divided holder 4B. Here, as shown in FIG. 1, the armature 32 is fixed to the second divided holder 4 </ b> B, so that the armature 32 is eventually transmitted by the force transmitted from the elastic member 14 via the motion conversion mechanism 31. It is in a state of being urged away from the rotor 33.

  An operation example of this rotation transmission device will be described.

  As shown in FIG. 1, when energization to the electromagnet 34 is stopped, the rotation transmission device is in an engaged state in which rotation is transmitted between the outer ring 1 and the inner ring 2. That is, when energization to the electromagnet 34 is stopped, the armature 32 is separated from the rotor 33 by the force of the elastic member 14. Further, at this time, the roller 3a on the front side in the forward rotation direction causes the cylindrical surface on the inner circumference of the outer ring 1 by the force of the elastic member 14 that presses the rollers 3a and 3b in the direction in which the distance between the pair of rollers 3a and 3b increases. 13 and an outer front cam surface 12 a on the outer periphery of the inner ring 2, and a roller 3 b on the rear side in the forward rotation direction is a cylindrical surface 13 on the inner periphery of the outer ring 1 and a rear cam surface on the outer periphery of the inner ring 2. 12b is in an engaged state. In this state, when the inner ring 2 rotates in the forward rotation direction, the rotation is transmitted from the inner ring 2 to the outer ring 1 via the roller 3b on the rear side in the forward rotation direction. Further, when the inner ring 2 rotates in the reverse direction, the rotation is transmitted from the inner ring 2 to the outer ring 1 via the front roller 3a in the forward direction.

  On the other hand, when the electromagnet 34 is energized, the rotation transmission device is in an engagement disengaged state (idling state) in which the rotation transmission between the outer ring 1 and the inner ring 2 is interrupted. That is, when the electromagnet 34 is energized, the armature 32 is attracted to the rotor 33, and in conjunction with the operation of the armature 32, the second split holder 4B moves away from the inner ring 2 with respect to the first split holder 4A. Move in the axial direction. At this time, the ball 45 of the motion conversion mechanism 31 rolls between the first spiral groove 44A and the second spiral groove 44B, and the first split retainer 4A and the second split hold are held by the guide action of the ball 45. The container 4B rotates relative to the container 4B. Then, due to the relative rotation of the first divided holder 4A and the second divided holder 4B, a pair of the column portion 15a of the first divided holder 4A and the column portion 15b of the second divided holder 4B are paired. The rollers 3a and 3b are pressed in the direction in which the distance between the rollers 3a and 3b is reduced, and as a result, the forward rotation direction between the inner peripheral cylindrical surface 13 of the outer ring 1 and the outer peripheral front cam surface 12a of the inner ring 2 is achieved. And the engagement of the rear roller 3b in the forward direction between the inner cylindrical surface 13 of the outer ring 1 and the rear cam surface 12b of the outer periphery of the inner ring 2 is released. Is also released. In this state, even if rotation is input to the inner ring 2, the rotation is not transmitted from the inner ring 2 to the outer ring 1, and the inner ring 2 rotates idle.

  This rotation transmission device is a mechanism for converting the relative movement in the axial direction of the first divided holder 4A and the second divided holder 4B into relative rotation, and a ball between the axially opposed surfaces of the two divided holders. Is not a mechanism (for example, a mechanism disclosed in Japanese Patent Application Laid-Open No. 2014-9721), but a mechanism in which the ball 45 is incorporated in the spiral grooves 44A and 44B between the radially opposed surfaces 43A and 43B is employed. Therefore, not only when the first split holder 4A and the second split holder 4B move relative to each other in the axial direction, but also when they move relative to each other in the axial direction, the spiral grooves 44A, 44B. Due to the guiding action of the ball 45 by the above, the first divided holder 4A and the second divided holder 4B rotate relative to each other. Therefore, there is no possibility that the first divided holder 4A and the second divided holder 4B move relative to each other in the axial direction without relative rotation, and there is no possibility that the ball 45 falls off. Therefore, the reliability of the operation of switching between transmission and interruption of rotation between the outer ring 1 and the inner ring 2 is high.

  In addition, this rotation transmission device converts the relative movement in the axial direction of the first divided holder 4A and the second divided holder 4B into relative rotation by the spiral grooves 44A, 44B and the balls 45 at three or more locations. When the first split holder 4A and the second split holder 4B move relative to each other, the postures of the split holders 4A and 4B are stabilized, and the relative movement of the split holders 4A and 4B is smooth. is there.

  In the above embodiment, the cylindrical surface 13 is provided on the inner periphery of the outer ring 1 and the cam surface 12 is provided on the outer periphery of the inner ring 2, but the cam surface 12 (the front cam surface 12a and the rear cam surface 12b is provided on the inner periphery of the outer ring 1. ), A cylindrical surface 13 may be provided on the outer periphery of the inner ring 2, and a pair of rollers 3 a and 3 b may be incorporated between the cam surface 12 on the inner periphery of the outer ring 1 and the cylindrical surface 13 on the outer periphery of the inner ring 2.

  In the above-described embodiment, the rollers 3a and 3b are employed as the engaging members incorporated between the inner periphery of the outer ring 1 and the outer periphery of the inner ring 2, but it is also possible to employ engaging members other than the rollers. For example, between the cylindrical surface formed on the inner periphery of the outer ring 1 and the cylindrical surface formed on the outer periphery of the inner ring 2, it engages between the inner periphery of the outer ring 1 and the outer periphery of the inner ring 2 in a standing state, A plurality of sprags (not shown) having a shape whose height dimension changes according to the posture can be incorporated so that the engagement is released.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3a, 3b Roller 4A 1st division | segmentation holder | retainer 4B 2nd division | segmentation holder | retainer 30 Axial direction moving apparatus 31 Motion conversion mechanism 32 Armature 33 Rotor 34 Electromagnet 43A, 43B Opposite surface 44A 1st spiral groove 44B 1st 2 spiral grooves 45 balls

Claims (3)

Outer ring (1),
An inner ring (2) disposed inside the outer ring (1) and supported so as to be rotatable relative to the outer ring (1);
A pair of engagement elements (3a, 3b) incorporated so as to oppose each other in the circumferential direction between the inner periphery of the outer ring (1) and the outer periphery of the inner ring (2);
An engagement position for engaging the pair of engagement elements (3a, 3b) between the outer ring (1) and the inner ring (2), and an engagement release for releasing engagement of the engagement elements (3a, 3b) A first divided holder (4A) and a second divided holder (4B) supported so as to be rotatable relative to each other;
An axial movement device (30) for relatively moving the first divided holder (4A) and the second divided holder (4B) in the axial direction;
When the first split holder (4A) and the second split holder (4B) move in the axial direction, the relative movement in the axial direction is changed between the first split holder (4A) and the second split holder. A rotation transmission device having a motion conversion mechanism (31) for converting into relative rotation of the split cage (4B) of
The motion conversion mechanism (31)
Radial facing surfaces provided on both split cages (4A, 4B) so as to face each other in the radial direction between the first split cage (4A) and the second split cage (4B). (43A, 43B),
The first split holder (4A) is formed on the facing surface (43A) of the first split holder (4A) with respect to the second split holder (4B) so as to be inclined in the circumferential direction with respect to the axial direction. Spiral groove (44A),
The second split cage (4B) is formed on the facing surface (43B) with respect to the first split cage (4A) so as to extend in the same direction as the first spiral groove (44A). 2 spiral grooves (44B),
A rotation transmission device comprising a ball (45) incorporated between the first spiral groove (44A) and the second spiral groove (44B). The first spiral grooves (44A) are provided at three or more locations at intervals in the circumferential direction,
The second spiral grooves (44B) are provided at three or more locations at intervals in the circumferential direction at positions facing the first spiral grooves (44A) in the radial direction,
The rotation transmission device according to claim 1, wherein the ball (45) is incorporated between each of the first spiral groove (44A) and the second spiral groove (44B). The axial movement device (30)
An armature (32) connected to one of the first split holder (4A) and the second split holder (4B) so as to move integrally in the axial direction;
A rotor (33) disposed axially opposite the armature (32);
The rotation transmission device according to claim 1 or 2, comprising an electromagnet (34) for attracting the armature (32) to the rotor (33) by energization.

Images