JP2015129525A - Rotation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation transmission device capable of reducing collision noise or oscillation when an armature forming an electromagnetic clutch is attracted to a rotor.SOLUTION: A cushioning member 70 is provided on a confronting surface with respect to a rotor 52 of an armature 51 in a rotation transmission device, in which the armature 51 is attracted to the rotor 52 by applying current to an electromagnet 53 of an electromagnetic clutch 50 so that engagement of a two-way clutch 10 is released. The cushioning member 70 is constituted by an annular body 71 having a cylindrical part 73 on an outer periphery of an annular plate part 72, and an elastic protrusion 75 fixed on an inner surface of the annular plate part 72 in the annular body 71, and the cylindrical part 73 of the annular body 71 is fitted on an outer periphery of the rotor 52, and the protrusion 75 is brought into contact with an armature attraction surface 52c, and when the armature 51 is attracted, the protrusion 75 is elastically deformed so as to absorb impact force in attraction.

Description

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

  As a rotation transmission device for transmitting and interrupting rotation from an input shaft to an output shaft, a two-way clutch for coupling and releasing the input shaft and the output shaft is provided, and the engagement and release of the two-way clutch are electromagnetic clutches. What is controlled by this is conventionally known.

  In the rotation transmission device described in Patent Literature 1, a control cage and a rotation cage are provided between an outer ring provided at the shaft end portion of the output shaft and an inner ring provided at the shaft end portion of the input shaft. Assembling so that the pillars formed in each cage are alternately arranged in the circumferential direction, incorporating a pair of opposing rollers in a pocket formed between adjacent pillars, and connecting the pair of rollers between the opposing parts The elastic member incorporated in the outer ring is energized in the direction of separation, and 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. The one roller is engaged with the cylindrical surface and the cam surface by the rotation, and the rotation of the inner ring is transmitted to the outer ring.

  Also, 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 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 above rotation transmission device, when energization of the electromagnetic coil of the electromagnetic clutch is released, the circumferential width of the pocket between the control holder and the rotation holder increases due to the pressing action of the elastic member incorporated between the pair of opposed rollers. The pair of rollers that rotate relative to each other in the direction immediately engage with the cylindrical surface and the cam surface, so that the rotational direction play is extremely small and the response is excellent.

JP 2012-149746 A

  By the way, in the conventional rotation transmission device described in Patent Document 1, the electromagnetic clutch is arranged so that the armature connected to the control retainer and the rotor disposed opposite to each other in the axial direction with a gap between the armature and the armature. And an electromagnet that is supported by a stationary member and is opposed to the rotor in the axial direction. When the electromagnet is energized, a magnetic attractive force is applied to the armature and attracted to the rotor, and the control retainer is axially moved together with the armature. When the armature is attracted to the rotor, the armature impacts against the rotor, causing collision noise and vibration, which may cause discomfort and anxiety. The power points are left.

  An object of the present invention is to provide a rotation transmission device capable of reducing collision noise and vibration generated when an armature is attracted to a rotor.

  In order to solve the above-described problems, in the present invention, a two-way clutch that transmits and blocks rotation between an input shaft and an output shaft that is arranged coaxially with the input shaft, and the two-way clutch are provided. An electromagnetic clutch for controlling engagement and disengagement, wherein the two-way clutch is between the inner periphery of the outer ring provided at the shaft end of the output shaft and the outer periphery of the inner ring provided at the shaft end of the input shaft. In addition, the pillars provided in the control cage and the rotary cage are assembled so that they are alternately arranged in the circumferential direction, and the inner circumference of the outer ring and the outer circumference of the inner ring are placed in pockets formed between adjacent pillar parts. A pair of engagement elements that can be engaged with each other, and an elastic member that urges the pair of engagement elements in a direction away from each other, and the electromagnetic clutch is coupled to the control retainer. Armature and its armature A rotor that is disposed opposite to the rotor in the axial direction with a gap therebetween, and an electromagnet that is supported by a stationary member and faces the rotor in the axial direction, and applies a magnetic attractive force to the armature by energization to attract the rotor. The control cage is moved in the axial direction by energization of the electromagnet, and the movement in the axial direction is relatively rotated in the direction in which the circumferential width of the pocket is reduced by the motion conversion mechanism. In the rotation transmission device that converts the movement to disengage the pair of engagement elements, a buffer member is attached to the outer peripheral portion of the armature suction surface facing the armature of the rotor, and the buffer member is an annular plate portion An annular body provided with a cylindrical portion on the outer periphery thereof, and an elastic protrusion provided on the inner surface of the annular plate portion of the annular body, the cylindrical portion of the annular body being the rotor Mounted on an outer periphery the protrusion contacts the armature suction surface, the outer surface of the annular plate portion is had adopted a configuration in which the mounting projecting from the armature suction surface.

  In the rotation transmission device configured as described above, when the electromagnet of the electromagnetic clutch is energized, a magnetic attractive force is applied to the armature, and the armature moves toward the rotor and is attracted to the rotor. The armature presses the annular plate portion at a position just before the armature is attracted to the rotor, and the elastic protruding portion is elastically deformed by the pressing. The elastic deformation absorbs the impact when the armature is adsorbed to the rotor, thereby suppressing the occurrence of collision noise and vibration.

  Here, when attaching the buffer member to the rotor, by attaching a plurality of protrusions formed on the inner diameter surface of the cylindrical portion of the annular body to the annular groove formed on the outer periphery of the rotor, The buffer member can be easily attached.

  The shock-absorbing member can be attached to the outer periphery of the end of the armature to be attracted to absorb the impact when the armature is attracted. In this case, the shock-absorbing member inhibits the connection between the armature and the control cage. It takes time to assemble. By attaching the buffer member to the rotor as in the present invention, the armature and the control retainer can be easily connected, and the assemblability can be improved.

  In the rotation transmission device according to the present invention, the elastic shock-absorbing projecting portion may be an annular ring that is continuous in the circumferential direction, and includes a plurality of protrusions that are discontinuous in the circumferential direction. It may be. The protrusion may be fixed to the inner surface of the annular plate portion of the ring body by adhesion. For example, a ring-shaped rubber is simply interposed between the annular plate portion and the armature adsorption surface of the rotor. It may be a thing.

  In the rotation transmission device according to the present invention, a concave step is formed on the outer peripheral portion of the attracted surface facing the rotor of the armature, and a circular bulge that can be fitted inside the annular plate portion inside the concave step. It is preferable that a protrusion height from the axial end surface of the concave step portion of the circular bulge portion is lower than a protrusion length from the armature suction surface of the annular plate portion.

  As described above, when a concave step is formed on the outer peripheral portion of the attracted surface of the armature and a circular bulge is provided inside the concave step, the facing portion of the armature and the rotor in the assembled state of the electromagnetic clutch In the meantime, it is possible to secure a small gap equal to or shorter than the protruding length of the annular plate portion, and a large magnetic attractive force can be applied to the armature.

  In the present invention, as described above, by providing the buffer member on the outer peripheral portion of the armature suction surface of the rotor, the impact force when the armature is attracted to the rotor is buffered by the elastic deformation of the protrusion provided on the buffer member. It is possible to reduce collision noise and vibration.

  Further, since the buffer member is provided on the rotor side, the connection between the armature and the control cage can be facilitated and the assemblability can be improved as compared with the case where the buffer member is provided on the armature.

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. Sectional drawing which expands and shows the attachment part of the buffer member of the rotor shown in FIG. Front view of cushioning member Sectional view along line XX in FIG. (C), (d) is sectional drawing which shows the other example of a buffer 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 as a stationary member covering the shaft ends of both shafts, and the housing 3 includes a two-way clutch 10 that transmits and blocks rotation from the input shaft 1 to the output shaft 2 and an electromagnetic clutch 50 that controls 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 and 2, 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 is provided at the shaft end of the input shaft 1. A plurality of cam surfaces 14 are formed on the outer periphery of the inner ring 13 at equal intervals in the circumferential direction, and a roller 15 and an elastic member 20 as a pair of engaging members are incorporated between each of the plurality of cam surfaces 14 and the cylindrical surface 12, The roller 15 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 pair of rollers 15 with the cylindrical surface 12 and the cam surface 14 by rotating the inner ring 13 in one direction. Further, 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 end portion of the inner ring 13 is rotatably supported by a bearing 18 incorporated in the concave portion 17.

  Although the inner ring 13 is serrated to the shaft end portion of the input shaft 1 and is prevented from rotating, the inner ring 13 may be provided 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. The elastic member 20 is installed between the pair of rollers 15, and the elastic member 20 biases the pair of rollers 15 away from each other to engage the cylindrical surface 12 and the cam surface 14. Is arranged.

  The holder 16 includes a control holder 16A and a rotary holder 16B. As shown in FIGS. 1, 2, and 6, the control retainer 16 </ b> A is provided with the same number of column portions 22 as the cam surface 14 on the outer peripheral portion of one surface of the annular flange 21 at equal intervals in the circumferential direction. An arc-shaped long hole 23 is formed between the portions 22, and a cylindrical portion 24 is provided on the outer periphery in a direction opposite 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 outer ring 11 are integrated.

  By incorporating the cages 16A and 16B as described above, as shown in FIG. 2, 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. The pocket 27 faces the cam surface 14 of the inner ring 13 in the radial direction, and a roller 15 and an elastic member 20 as a pair of opposed engaging members are incorporated in each pocket 27.

  As shown in FIG. 1, the flange 21 of the control holder 16 </ b> A is slidably supported along a slide guide surface 29 formed on the outer periphery of the input shaft 1. On the other hand, the rotary cage 16B is rotatably supported by a thrust bearing 30 incorporated between the above-described support ring 28 fitted to the flange 25 and 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 FIG. 1, 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 relative to the control holder 16A and the rotary holder 16B. A torque cam 40 is provided as a motion conversion mechanism for converting into a typical rotational motion.

  As shown in FIGS. 7 (a) and 7 (b), the torque cam 40 gradually becomes deeper at both ends in the center in the circumferential direction on the opposing surfaces of the flange 21 of the control holder 16A and the flange 25 of 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.

  Here, the cam groove 41 is formed by a pair of inclined cam surfaces 41a and 41b inclined in opposite directions, and has a V-shaped cross section. On the other hand, like the cam groove 41, the cam groove 42 is formed by a pair of inclined cam surfaces 42a and 42b and has a V-shaped cross section.

  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, 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 FIG. 1, a holder fitting surface 44 having a slightly larger diameter than the slide guide surface 29 is formed on the inner ring 13 at the end on the slide guide surface 29 side formed on the input shaft 1. An annular spring holder 45 that prevents the roller 15 and the elastic member 20 from falling off in the axial direction is fitted to the fitting surface 44.

  The spring holder 45 is positioned in the axial direction so as to abut against the axial end surface of the inner ring 13. As shown in FIGS. 4 and 5, a plurality of detent pieces 46 are formed on the outer periphery of the spring holder 45 between the column portion 22 of the control holder 16A and the column portion 26 of the rotation holder 16B. .

  When the control retainer 16A and the rotation retainer 16B rotate relative to each other in a direction that reduces the circumferential width of the pocket 27, the plurality of detent pieces 46 are connected to the column portion 22 of the control retainer 16A and the rotation retainer 16B. The column portion 26 is received at both side edges and held in a neutral position where the pair of opposed rollers 15 are disengaged.

  A spring holding piece 47 that extends in the axial direction and protrudes to the outside of the elastic member 20 is formed on the outer periphery of each of the plurality of detent pieces 46, and a notch 48 formed on the inner diameter side of the spring holding piece 47. The outer peripheral portion of the elastic member 20 is fitted, and the fitting prevents the elastic member 20 from moving in the axial direction of the roller 15 and prevents the elastic member 20 from falling off between the pair of opposed rollers 15. .

  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 rotatably and slidably supported by the support ring 28 provided on the input shaft 1, and a connecting cylinder 55 is formed on the outer peripheral portion of the armature 51, and is controlled and held on the inner diameter surface of the connecting cylinder 55. The cylindrical portion 24 of the container 16A is press-fitted, and the control holder 16A and the armature 51 are connected and integrated. By the connection, the armature 51 is slidably supported at two locations in the axial direction of the slide guide surface 29 on the outer periphery of the support ring 28 and the outer periphery of the input shaft 1.

  Here, the support ring 28 is positioned in the axial direction by a step portion 31 formed on the other side in the axial direction of the slide guide surface 29 of the input shaft 1.

  The rotor 52 has cylindrical portions 52a and 52b on the outer periphery and inner periphery, the inner peripheral cylindrical portion 52b is fitted to the input shaft 1, and a sleeve 54 is incorporated between the fitting portions. The rotor 52 is positioned in the axial direction by a shim 56 incorporated between the rotor 52 and the support ring 28.

  The electromagnet 53 includes an electromagnetic coil 53a and a core 53b that supports the electromagnetic coil 53a. The core 53b is fitted into the other end opening of the housing 3 as a stationary member, and is attached to the other end opening. The retaining ring 6 is used to prevent the removal. The core 53 b is rotatable relative to the input shaft 1 via a bearing 57 fitted to the input shaft 1.

  As shown in FIG. 8, the rotor 52 is provided with a buffer member 70 for buffering an impact at the time of armature suction on the outer peripheral portion of the armature suction surface 52 c facing the armature 51.

  As shown in FIGS. 9 and 10, the buffer member 70 includes an annular body 71 provided with cylindrical portions 73 and 74 facing in the same direction on the outer periphery and inner periphery of the annular plate portion 72, and the annular plate in the annular body 71. A plurality of protrusions 76 are provided on the inner surface of the outer peripheral cylindrical portion 73 formed on the outer periphery of the annular plate portion 72 at intervals in the circumferential direction. Is provided.

  Here, the ring body 71 is a metal thin plate press-molded product, but may be a resin molded product.

  The protrusion 75 is made of rubber, and is fixed to the inner surface of the annular plate portion 72 by vulcanization adhesion. Here, as the projecting portion 75, an annular shape that is continuous in the circumferential direction is shown.

  As shown in FIG. 8, the buffer member 70 is configured such that the outer peripheral cylindrical portion 73 of the ring body 71 is fitted to the outer periphery of the rotor 52, and the protrusion 76 provided on the outer peripheral cylindrical portion 73 A snap fit is attached to engage with the annular groove 77 formed in the inner wall. In the attached state, the end surface of the projecting portion 75 contacts the armature suction surface 52c of the rotor 52, and the annular plate portion 72 projects from the armature suction surface 52c. δ indicates the protruding length of the annular plate portion 72.

  An annular groove 58 is formed on the armature suction surface 52 c of the rotor 52 at a portion facing the inner peripheral cylindrical portion 74 of the ring body 71. On the other hand, a concave step portion 59 is formed on the outer peripheral portion of the attracted surface 51a facing the rotor 52 of the armature 51, and an annular groove 60 is formed on the inner peripheral portion of the axial end surface 59a of the concave step portion 59, A circular bulging portion 61 is provided inside the annular groove 60.

  The height h from the axial end surface 59 a of the concave step portion 59 of the circular bulging portion 61 is lower than the projecting length δ of the annular plate portion 72, and when the armature 51 is attracted to the rotor 52, An axial end surface 59 a of the portion 59 presses the annular plate portion 72 of the buffer member 70.

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

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

  Here, since the armature 51 is connected and integrated with the control holder 16A, the flange 21 of the control holder 16A approaches the flange 25 of the rotary holder 16B as the armature 51 moves in the axial direction. Move in the direction.

  At this time, as shown in FIG. 7 (b), the ball 43 shown in FIG. 7 (a) rolls and moves toward the deepest groove depth of the cam grooves 41 and 42, and rotates and holds the control holder 16A. The container 16B relatively rotates in the direction in which the circumferential width of the pocket 27 decreases, and the pair of opposed rollers 15 are pushed by the column part 22 of the control holder 16A and the column part 26 of the rotation holder 16B so as to approach each other. Moving. For this reason, the roller 15 is disengaged from the cylindrical surface 12 and the cam surface 14 to be in a neutral state, and the two-way clutch 10 is disengaged.

  When the rotational torque is input to the input shaft 1 and the inner ring 13 is rotated in one direction in the disengaged state of the two-way clutch 10, the detent piece 46 formed on the spring holder 45 is the column 22 of the control retainer 16A. In order to press one of the column portions 26 of the rotation cage 16B, the control cage 16A and the rotation cage 16B rotate together with the inner ring 13. At this time, since the pair of opposed rollers 15 is held in the neutral position where the engagement is released, the rotation of the inner ring 13 is not transmitted to the outer ring 11 and the inner ring 13 rotates freely.

  Here, when the control retainer 16A and the rotation retainer 16B are relatively rotated in the direction in which the circumferential width of the pocket 27 is reduced, the column portion 22 of the control retainer 16A and the column portion 26 of the rotation retainer 16B are The amount of relative rotation is regulated by contacting both side edges of the rotation stopper piece 46.

  For this reason, the elastic member 20 does not shrink more than necessary, and even if it is repeatedly expanded and contracted, it will not be damaged by fatigue.

  When the energization of the electromagnetic coil 53a is released in the free rotation state of the inner ring 13, the armature 51 is released from the suction and becomes rotatable. Due to the release of 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 increases, and each of the pair of opposed rollers 15 is as shown in FIG. In addition, a standby state is established in which the cylindrical surface 12 and the cam surface 14 are engaged, and a unidirectional rotational torque is transmitted between the inner ring 13 and the outer ring 11 via one of the pair of opposed rollers 15.

  Here, when the input shaft 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. In addition, since the standby state in which the cam surface 14 is immediately engaged is reduced, the rotation direction play is small, and the inner ring 13 is integrated with the input shaft 1, so that the rotation of the input shaft 1 is immediately transferred from the inner ring 13 to the outer ring 11. Can communicate.

  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.

  Here, when the armature 51 is attracted to the rotor 52 by energization of the electromagnetic coil 53a, if the armature 51 comes into contact with the rotor 52 in an impact, a large collision sound or vibration is generated.

  In the embodiment, as shown in FIG. 8, since the buffer member 70 is provided on the outer peripheral portion of the armature suction surface 52 c of the rotor 52, it is formed on the outer peripheral portion of the surface to be attracted of the armature 51 when the armature 51 is attracted. The axial end surface 59 a of the recessed step portion 59 presses the annular plate portion 72 of the buffer member 70. By the pressing, the protruding portion 75 having elasticity is elastically deformed, and the elastic deformation prevents the armature 51 from impactingly contacting the rotor 52, so that the collision noise and vibration are greatly reduced.

  When the buffer member 70 is attached, a snap fit is attached so that the plurality of protrusions 76 formed on the inner diameter surface of the outer cylindrical portion 73 of the ring body 71 are engaged with the annular groove 77 formed on the outer periphery of the rotor 52. Therefore, the buffer member 70 can be easily attached to the rotor 52.

  The shock absorbing member 70 can also buffer the shock at the time of suction of the armature 51 by being attached to the outer periphery of the end of the armature 51 on the attracted surface side. However, the connecting cylinder of the armature 51 is connected to the cylindrical portion 24 of the control holder 16A. At the time of connection to press-fit 55, the outer peripheral portion of the armature 51 cannot be pressed due to the presence of the buffer member 70.

  For this reason, it is necessary to apply a pressing force to the inner peripheral portion of the armature 51 and press-fit the armature 51, and at the time of the pressing, the rear corner of the surface of the armature 51 with respect to the rotor 52 and the inner diameter surface of the connecting cylinder 55 intersect. The stress concentrates on the portion, and the armature 51 is deformed. The armature 51 and the control retainer 16A cannot be easily connected to each other, and the assembly is difficult.

  However, in the embodiment, since the buffer member 70 is attached to the rotor 52, a pressing force can be applied to the outer peripheral portion of the armature 51, and the armature 51 and the control retainer 16A can be easily connected. Therefore, the assemblability can be improved.

  9 and 10, the protrusion 75 that cushions the impact force by elastic deformation is shown to have an annular shape with a trapezoidal cross section. However, as shown in FIGS. 11C and 11D, the cross section has a triangular shape. The protrusion 75 may be formed of various cross-sectional shapes such as a combination of quadrangular shapes or a protrusion provided on the shape.

  11 (c) and 11 (d), protrusions 75a and 75b composed of a plurality of protrusions of two types having different heights are alternately provided in the circumferential direction, and the tip of the protrusion 75a having a high height is provided as an armature of the rotor 52. As the attachment to be brought into contact with the suction surface 52c, when the protrusion 75a is elastically deformed by a predetermined amount, the protrusion 75b having a low height is elastically deformed with a time difference so as to start elastically deforming.

  In the use of the protrusions 75a and 75b composed of two types of protrusions having different heights, only the protrusion 75a having a high height is elastically deformed when the suction force applied to the armature 51 is weak, and the armature 51 However, when the suction force increases toward the rotor 52, the projection 75b having a low height begins to elastically deform, so that the armature 51 can be reliably adsorbed without being hindered.

1 Input shaft 2 Output shaft 10 Two-way clutch 11 Outer ring 13 Inner ring 15 Roller (engagement element)
16A Control cage 16B Rotating cage 20 Elastic member 22 Column 26 Column 27 Pocket 40 Torque cam (motion conversion mechanism)
50 Electromagnetic clutch 51 Armature 51a Surface to be attracted 52 Rotor 52c Armature attracting surface 53 Electromagnet 59 Concave section 59a Axial end surface 61 Circular bulging portion 70 Buffer member 71 Ring body 72 Ring plate portion 73 Cylindrical portion 75 Projection portion 76 Projection portion 77 Ring shape groove

Claims (5)

A two-way clutch that transmits and blocks rotation between the input shaft and 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 each of the control cage and the rotary cage between the inner circumference of the outer ring provided at the shaft end portion of the output shaft and the outer circumference of the inner ring provided at the shaft end portion of the input shaft. A pair of engaging elements that can be engaged with the inner periphery of the outer ring and the outer periphery of the inner ring in a pocket formed between adjacent column parts, so as to be alternately arranged in the circumferential direction. It is configured to incorporate an elastic member that urges the pair of engagement elements in the direction of separating,
The electromagnetic clutch, an armature coupled to the control retainer, a rotor disposed in an axial direction with a gap between the armature, a stationary member and an axially opposed rotor; It consists of an electromagnet that applies a magnetic attractive force to the armature by energization and attracts it to the rotor,
When the electromagnet is energized, the control cage is moved in the axial direction, and the movement in the axial direction is converted into relative rotational motion in the direction in which the circumferential width of the pocket is reduced by the motion conversion mechanism. In the rotation transmission device adapted to disengage the pair of engagement elements,
A buffer member is attached to the outer peripheral portion of the armature suction surface facing the armature of the rotor, and the buffer member includes an annular body provided with a cylindrical portion on the outer periphery of the annular plate portion, and an inner portion of the annular plate portion in the annular body. It comprises an elastic protrusion provided on the surface, the cylindrical portion of the ring is fitted to the outer periphery of the rotor, the protrusion contacts the armature suction surface, and the outer surface of the annular plate portion is the armature suction A rotation transmission device protruding from a surface.   The rotation transmission device according to claim 1, wherein the ring body is a snap-fit attachment that engages a plurality of protrusions formed on an inner diameter surface of the cylindrical portion with an annular groove formed on an outer periphery of the rotor. .   The rotation transmission device according to claim 1, wherein the projecting portion has an annular shape that is continuous in a circumferential direction.   The rotation transmission device according to claim 1, wherein the protruding portion includes a plurality of annularly arranged protrusions that are discontinuous in the circumferential direction.   A concave step portion is formed on the outer peripheral portion of the attracted surface facing the rotor of the armature, and a circular bulging portion that can be fitted inside the annular plate portion is provided inside the concave step portion. The rotation transmission device according to any one of claims 1 to 4, wherein a protruding height of the protruding portion from the axial end surface of the concave step portion is lower than a protruding length of the annular plate portion from the armature suction surface.

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