JP2017003104A - Reverse input block clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse input block clutch which can make an output side stably idle at reverse input torque.SOLUTION: At input torque, an input shaft 1 and a cam shaft 2 rotate, an eccentric cam 5a integrated with the cam shaft 2 eccentrically rotates, a spacer 9 which is relatively rotatably fit to an external peripheral of the eccentric cam 5a a via a bearing 24 revolves, and thereby an output outer ring 6 to which torque is transmitted from the spacer 9 via a cam receiver 7 and a torque transmission mechanism 10 rotates. At reverse input torque, the input shaft 1 and the cam shaft 2 do not rotate by an action of a lock-type reverse input block mechanism 4, the eccentric cam 5a regulates a revolving motion of the spacer 9, and thereby the output outer ring 6 rotates while making the spacer 9 revolve via the torque transmission mechanism 10. By this constitution, when the supply of the input torque is stopped, the spacer 9 is not brought into a lock state, and a stable idling motion can be obtained.SELECTED DRAWING: Figure 1

Description

  In the present invention, the input torque applied from the input side is transmitted to the output side, and when the reverse input torque is applied from the output side, the reverse input prevents the input side member from rotating by causing the output side member to idle. It relates to a shut-off clutch.

  In recent years, in various electric devices, in order to reduce size and weight and improve efficiency, it has become common to use a combination of a small high-speed rotation motor and a reduction gear with a high reduction rate. However, if a reduction gear with a high deceleration rate is installed, a large force is required to move the drive unit from the operating unit side when the motor cannot be driven by a motor due to a power failure, etc. It is often difficult to do.

  On the other hand, in some electric appliances, when the input torque applied to the input side member is transmitted to the output side member between the drive unit and the operating unit, and reverse input torque is applied from the output side, Incorporating a reverse input shut-off clutch of a method that prevents the input side member from rotating by causing the output side member to idle (hereinafter, this method is referred to as “idle type”) and moving the drive unit at the time of a power failure, etc. The operating part can be easily operated manually.

  Here, as the above-mentioned idling type reverse input cutoff clutch, there is one proposed in Patent Document 1, for example. This reverse input shut-off clutch has an output shaft arranged coaxially with the input outer ring on the radially inner side of the input outer ring, a plurality of cam surfaces are provided in the circumferential direction on the inner peripheral surface of the input outer ring, and the outer cylindrical surface of the output shaft A wedge-shaped space that gradually narrows on both sides in the circumferential direction is formed between each cam surface of the outer ring, and a cage is provided that holds the rollers arranged in each wedge-shaped space so as to be able to engage with and disengage from the input outer ring and the output shaft. The cage is connected to the input outer ring via a centering spring, and a sliding spring that slides on the fixing member in a state of being engaged with the cage is incorporated.

  When this reverse input shut-off clutch is assembled, the roller is held by the retainer in a state where the roller is detached from the input outer ring and the output shaft at the center of the wedge-shaped space by the elastic force of the centering spring. Even if reverse input torque is applied to the roller, the roller does not engage with the input outer ring and the output shaft, and only the output shaft idles so that the input outer ring does not rotate. On the other hand, when an input torque is applied to the input outer ring, the centering spring is elastically deformed between the input outer ring and the cage that receives the sliding resistance of the sliding spring, resulting in a rotational phase difference between the input outer ring and the cage. Thus, the roller held by the cage moves relatively to the narrow portion of the wedge-shaped space and engages with the input outer ring and the output shaft, and the torque of the input outer ring is transmitted to the output shaft.

JP 2003-120715 A

  However, in the idling type reverse input cutoff clutch proposed in Patent Document 1, the output shaft is smoothed when the reverse input torque is applied from the output side immediately after the torque is transmitted from the input side to the output side. May not be idle. This is because when the torque is transmitted from the input side to the output side, the roller enters the narrow part of the wedge-shaped space between the input outer ring and the output shaft and generates a large pressure to engage (lock) the input outer ring and the output shaft. Therefore, even after the supply of the input torque is stopped, the retainer and the roller cannot be returned to the assembly position by the elastic force of the centering spring, and the locked state may be held in some cases.

  Therefore, in an electric device in which the reverse input cutoff clutch is incorporated between the drive unit and the operation unit, the input outer ring must be stopped before the motor is stopped in order to stably rotate the output shaft while the motor is stopped. Has to be slightly reversed once to release the clutch locked state, and there is a problem that motor control becomes complicated. Further, when the motor stops unintentionally at the time of a power failure or the like, the locked state of the clutch is not released, and there is a possibility that the operation part cannot be operated manually or the like.

  Therefore, an object of the present invention is to provide a reverse input cutoff clutch that can stably rotate the output side against reverse input torque.

  In order to solve the above-described problems, the reverse input cutoff clutch of the present invention has an input shaft and a camshaft arranged on the same axis so as to be able to transmit rotation, and an eccentric axis parallel to the axis is connected to the camshaft. A cylindrical eccentric cam is provided, an output outer ring is arranged on the radially outer side of the eccentric cam, and a cylindrical cam receiver inserted on the inner periphery of the output outer ring has the same axis as the eccentric cam An eccentric hole is formed, the eccentric cam is inserted into the eccentric hole, and a cylindrical spacer is fitted between the inner peripheral surface of the eccentric hole of the cam receiver and the outer peripheral surface of the eccentric cam so as to be relatively rotatable, Provided is a torque transmission mechanism for connecting the spacer and the output outer ring so as to be able to transmit torque, and for the input torque applied from the input side, the input shaft and the cam shaft are rotated, and the reverse input torque applied from the output side For the input shaft When the input torque is applied from the input side, the input shaft and the camshaft rotate, the eccentric cam rotates eccentrically, and the spacer revolves. When the output outer ring to which torque is transmitted from the spacer via the cam receiver and the torque transmission mechanism rotates and reverse input torque is applied from the output side, the input shaft and the cam shaft do not rotate, A configuration is adopted in which the output outer ring rotates while rotating the spacer via a torque transmission mechanism by the eccentric cam regulating the revolving motion of the spacer.

  According to the above configuration, the spacer fitted so as to be relatively rotatable between the inner peripheral surface of the eccentric hole of the cam receiver and the outer peripheral surface of the eccentric cam can prevent the cam receiver and eccentricity even when the supply of input torque is stopped. Since there is no possibility of locking with the cam, when reverse input torque is applied from the output side, the output outer ring can rotate while smoothly rotating the spacer, and a stable idling operation can be obtained.

  As the torque transmission mechanism, a flange-like connecting portion is provided at one end of the spacer, a lid portion is provided at one end of the output outer ring, and the connecting portion of the spacer and the lid portion of the output outer ring are axially provided. A flat plate-like connecting member is provided, and a first uneven fitting portion that extends in the radial direction of the spacer and slidably engages with each other on the axially opposed surfaces of the connecting member and the connecting portion of the spacer. And a second concavo-convex fitting that extends in a direction orthogonal to the first concavo-convex fitting portion and is slidably fitted to each other on the axially opposed surfaces of the connecting member and the lid portion of the output outer ring. What provided the joint part can be employ | adopted.

  Further, as the reverse input blocking mechanism, a rotation transmitting means for transmitting the rotation of the input shaft to the cam shaft with a slight angular delay is provided between the input shaft and the cam shaft, and the braking that rotates integrally with the cam receiver. A fixed outer ring is arranged on the outer side in the radial direction of the shaft, and a plurality of cam surfaces are provided on the outer peripheral surface of the braking shaft. A wedge-shaped space that gradually narrows is formed, and a pair of rollers and a spring that pushes the roller into the narrow portion of the wedge-shaped space are incorporated in each wedge-shaped space, and column portions that are inserted on both sides in the circumferential direction of each wedge-shaped space are incorporated. What has connected the lock release piece which has so that it may rotate integrally with the said input shaft is employable.

  Alternatively, as the reverse input blocking mechanism, the input shaft and the cam shaft are integrated, the driven shaft that rotates integrally with the cam receiver is slidably fitted on the outer periphery of the cam shaft, and can be slid on the outer periphery of the driven shaft. An engagement pin that is inserted in the radial direction with a circumferential clearance is provided on the driven inner shaft and the cam shaft, a fixed outer ring is arranged on the outer side in the radial direction of the braking inner ring, and an outer peripheral surface of the braking inner ring Are provided with a plurality of cam surfaces, and a wedge-shaped space gradually narrowing on both sides in the circumferential direction is formed between the inner peripheral cylindrical surface of the fixed outer ring and each cam surface of the braking inner ring. A roller and a spring that pushes the roller into a narrow portion of the wedge-shaped space are incorporated, and lock release pieces having pillar portions inserted on both sides in the circumferential direction of each wedge-shaped space are connected to rotate integrally with the input shaft. Can also adopt Kill.

  As described above, the reverse input cutoff clutch of the present invention can idle the output outer ring stably with respect to the reverse input torque. Therefore, in the electric equipment in which the reverse input cutoff clutch is incorporated between the drive unit and the operating unit, the motor control becomes simpler than in the case of incorporating the conventional idle type, and the motor is controlled at the time of power failure. Even when the operation stops unintentionally, the operating part can be easily operated manually or the like.

Transverse plan view of the reverse input cutoff clutch of the first embodiment 1 is an exploded perspective view of the main part of FIG. Sectional view along line III-III in FIG. a to d are cross-sectional views illustrating the operation of the lock-type reverse input blocking mechanism corresponding to FIG. Sectional view along line VV in FIG. Sectional drawing explaining idling operation of a clutch corresponding to FIG. Transverse plan view of the reverse input cutoff clutch of the second embodiment Sectional view along line VIII-VIII in FIG. a and b are sectional views for explaining the operation of the lock type reverse input blocking mechanism corresponding to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 6 show a first embodiment. As shown in FIGS. 1 and 2, the reverse input cutoff clutch includes an input shaft 1 having a D-shaped cross section, a cam shaft 2 arranged on the same axis as the input shaft 1, and an outer periphery of the cam shaft 2. A cylindrical intermediate shaft 3 that is movably fitted, a lock-type reverse input blocking mechanism 4 that is provided between the input shaft 1 and the cam shaft 2, and a cylindrical shape that is integrally formed at the longitudinal center of the cam shaft 2. Eccentric cam 5a, a cylindrical driven eccentric cam 5b integrally formed at one end of the intermediate shaft 3, an output outer ring 6 disposed radially outside the eccentric cam 5a and the driven eccentric cam 5b, and an output outer ring A cylindrical cam receiver 7 that is slidably inserted into the inner periphery of 6, a brake shaft 8 that is integrally formed with the cam receiver 7 and fitted on the outer periphery of the intermediate shaft 3, and the inner peripheral surface of the cam receiver 7 and the eccentricity Cylindrical screws which are fitted between the cam 5a and the outer peripheral surface of the driven eccentric cam 5b so as to be relatively rotatable. And p o 9, which is basically composed of the torque transmission mechanism 10 that connects the spacer 9 and the output outer ring 6 so that torque can be transmitted.

  An input gear 11 is fitted and fixed to the outer periphery of the input shaft 1, and an output gear 12 is integrally formed on the outer periphery of the output outer ring 6. Further, the output outer ring 6 is provided with a support member 13 that prevents the cam receiver 7 from coming off on the inner circumference on the other end side, and is provided with a lid portion 6a through which one end portion of the cam shaft 2 passes on one end side. ing. A part of the torque transmission mechanism 10 is configured at a position sandwiched in the axial direction between the lid portion 6a of the output outer ring 6 and an inward flange-shaped connecting portion 9a provided at one end of the spacer 9, as will be described later. A disk-shaped connecting member 14 is disposed. Note that the output outer ring may be formed by separately forming a lid portion on one end side and integrally forming a support member on the other end side.

  The eccentric cam 5a and the driven eccentric cam 5b have an eccentric axis parallel to the axis of the cam shaft 2, and an eccentric shaft having the same eccentric axis as the eccentric cam 5a and the driven eccentric cam 5b on one end side of the cam receiver 7. A hole 7a is formed. Then, the eccentric cam 5a and the driven eccentric cam 5b are fitted into the eccentric hole 7a of the cam receiver 7 via the spacer 9, and a set screw 15 is screwed into the outer periphery of the intermediate shaft 3 from the outer periphery of the brake shaft 8, thereby 7, the brake shaft 8, the intermediate shaft 3, and the driven eccentric cam 5b are integrated. Even if the set screw 15 is not provided, when the eccentric cam 5a rotates eccentrically, the braking shaft 8 and the intermediate shaft 3 rotate integrally therewith. Further, the cam receiver 7 and the braking shaft 8, the intermediate shaft 3 and the driven eccentric cam 5b may be integrally formed.

  As shown in FIGS. 1 to 3, the reverse input blocking mechanism 4 connects the input shaft 1 and the cam shaft 2 so as to be able to transmit rotation, and a fixed outer ring 16 is disposed on the radially outer side of the braking shaft 8. An annular unlocking piece 17 having a plurality of column portions 17 a inserted between the outer peripheral surface of the brake shaft 8 and the inner peripheral surface of the fixed outer ring 16 is integrally formed at one end of the input shaft 1. A roller 18 and a coil spring 19 are incorporated between the pillar portions 17a. Note that the lock release piece may be formed separately from the input shaft and connected to rotate integrally with the input shaft.

  Here, the fixed outer ring 16 is formed integrally with the housing 20, and a flange portion 20 a at one end of the housing 20 is sandwiched and fixed between two fixing plates 21 and 22. The housing 20 is fitted with a lid 20b formed separately on the inner periphery of the other end, and the input shaft 1 is passed through the center of the lid 20b.

  An engagement hole 1a having an oval cross section is provided at the center of one end surface of the input shaft 1, and an engagement protrusion 2a having an oval cross section provided on the other end surface of the cam shaft 2 is provided around the engagement hole 1a. The rotation of the input shaft 1 is transmitted to the cam shaft 2 with a slight angular delay.

  The outer peripheral surface of the brake shaft 8 is provided with a plurality of cam surfaces 8a orthogonal to the radial direction, and gradually narrows on both sides in the circumferential direction between the cam surfaces 8a and the inner peripheral cylindrical surface of the fixed outer ring 16. A wedge-shaped space 23 is formed. In each wedge-shaped space 23, a pair of rollers 18 are arranged in a state of sandwiching a coil spring 19 that pushes each roller 18 into a narrow portion of the wedge-shaped space 23, and both circumferential sides of each wedge-shaped space 23 (coils across the roller 18 are coiled). The column portion 17a of the unlocking piece 17 is inserted at a position facing the spring 19).

  In the reverse input blocking mechanism 4, when reverse input torque is applied from the output side to the camshaft 2 and the eccentric cam 5 a with no input torque applied to the input shaft 1, the cam receiver 7 and the braking shaft 8. Although the cam shaft 2 and the eccentric cam 5a try to rotate integrally, the roller 18 is pushed between the braking shaft 8 and the fixed outer ring 16 into the narrow portion of the wedge-shaped space 23 by the elastic force of the coil spring 19, The brake shaft 8 is locked to the fixed outer ring 16 via the roller 18 on the rear side in the rotation direction, and the cam receiver 7 integrated with the brake shaft 8 is also locked. Since the locked cam receiver 7 regulates the eccentric rotation of the eccentric cam 5a via the spacer 9 and the bearing 24 arranged on the inner periphery thereof, the cam shaft 2 does not rotate and the input shaft 1 does not rotate.

  On the other hand, when input torque is applied to the input shaft 1 from the input side, first, as shown in FIGS. 4A and 4B, the input shaft 1 is slightly rotated, thereby locking the input shaft 1 integrally. Since the column portion 17a of the release piece 17 pushes the roller 18 on the rear side in the rotational direction against the elastic force of the coil spring 19 to the wide portion of the wedge-shaped space 23, the locked state between the brake shaft 8 and the fixed outer ring 16 is released. Then, the cam receiver 7 becomes free, and the eccentric rotation restriction of the eccentric cam 5a by the cam receiver 7 is also released. As shown in FIGS. 4C and 4D, when the input shaft 1 further rotates, the inner wall of the engagement hole 1a pushes the engagement protrusion 2a of the cam shaft 2 in the circumferential direction. The rotation of the input shaft 1 is transmitted to the cam shaft 2.

  Next, as shown in FIGS. 1, 2, and 5, the torque transmission mechanism 10 extends in the radial direction of the spacer 9 on the axially opposed surfaces of the connecting member 14 and the connecting portion 9 a of the spacer 9. A first concavo-convex fitting portion that is slidably fitted to each other is provided, and orthogonal to the first concavo-convex fitting portion on the axially opposed surfaces of the connecting member 14 and the lid portion 6a of the output outer ring 6. The spacer 9 and the output outer ring 6 are connected so as to be able to transmit torque by providing a second concavo-convex fitting portion extending in the direction and slidably fitted to each other.

  Here, the first concavo-convex fitting portion includes a convex portion 9b formed so as to extend in the radial direction on an outer surface of the connecting portion 9a of the spacer 9 (an axially facing surface with the connecting member 14), and a connecting member. 14 is formed on an inner side surface (a surface facing the connecting portion 9a of the spacer 9 in the axial direction), and a concave portion 14a into which the convex portion 9b of the spacer 9 is slidably fitted.

  Further, the second concave-convex fitting portion is formed on the outer side surface of the connecting member 14 (the axially facing surface with the lid portion 6a of the output outer ring 6) so as to extend in a direction perpendicular to the concave portion 14a on the inner side surface. A convex portion 14b, and a concave portion 6b that is formed on the inner side surface of the lid portion 6a of the output outer ring 6 (a surface facing the coupling member 14 in the axial direction), and into which the convex portion 14b of the coupling member 14 is slidably fitted. Consists of.

  The connecting portion 9a and the connecting member 14 of the spacer 9 have center holes 9c and 14c having the same diameter through which the camshaft 2 passes. The diameters of the holes 9c and 14c are such that the connecting member 14 transmits torque. Therefore, it is set to a size that does not interfere with the camshaft 2 when moving in parallel.

  This reverse input cutoff clutch has the above-described configuration, and when an input torque is applied to the input shaft 1 via the input gear 11, the braking shaft 8 and the cam receiver 7 are operated by the action of the reverse input cutoff mechanism 4 described above. , The rotation of the input shaft 1 is transmitted to the cam shaft 2 and the eccentric cam 5a, and the cam receiver 7, the brake shaft 8, the intermediate shaft 3 and the driven eccentric cam are accompanied by the eccentric rotation of the eccentric cam 5a. 5b also rotates. Then, due to the eccentric rotation of the eccentric cam 5a and the driven eccentric cam 5b and the rotation of the cam receiver 7, it is fitted between the inner peripheral surface of the eccentric hole 7a of the cam receiver 7 and the outer peripheral surface of the eccentric cam 5a and the driven eccentric cam 5b. The spacer 9 revolves, torque is transmitted from the spacer 9 to the output outer ring 6 via the cam receiver 7 and the torque transmission mechanism 10, and the output outer ring 6 rotates integrally with the output gear 12.

  On the other hand, when reverse input torque is applied to the output outer ring 6 via the output gear 12, torque is transmitted from the output outer ring 6 to the spacer 9 via the torque transmission mechanism 10, and this torque is transmitted to the eccentric cam 5a and Although transmitted to the camshaft 2, the braking shaft 8 and the cam receiver 7 are locked by the action of the reverse input blocking mechanism 4 described above, and the camshaft 2 and the eccentric cam 5 a (the intermediate shaft 3 and the driven eccentric cam 5 b). And the input shaft 1 does not rotate. At this time, the eccentric cam 5a restricts the revolving motion of the spacer 9, so that the connecting member 14 of the torque transmission mechanism 10 is connected to the spacer 9 and the output at the first and second concave-convex fitting portions as shown in FIG. The outer ring 6 slides and revolves while revolving, and the spacer 9 rotates between the cam receiver 7, the eccentric cam 5a, and the driven eccentric cam 5b without revolving. That is, the output outer ring 6 rotates while rotating the spacer 9 via the torque transmission mechanism 10.

  As described above, when the output outer ring 6 idles, the spacer 9 rotates between the cam receiver 7 and the eccentric cam 5a and the driven eccentric cam 5b. Therefore, when the supply of the input torque is stopped. However, there is no possibility that the spacer 9 is locked with the cam receiver 7, the eccentric cam 5a, and the driven eccentric cam 5b. Therefore, when reverse input torque is applied from the output side, the output outer ring 6 can slide and rotate with the cam receiver 7 in a locked state while smoothly rotating the spacer 9, and stable idling operation is achieved. can get.

  7 to 9 show a second embodiment. This embodiment is based on the first embodiment, and the configuration of the lock type reverse input blocking mechanism 4 is changed. Hereinafter, changes from the first embodiment will be mainly described. In addition, about the member which has the same function as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 7 and 8, the lock type reverse input blocking mechanism 4 of the second embodiment is formed by integrally forming an input shaft 1 and a cam shaft 2, and a cam receiver 7 on the outer periphery of the cam shaft 2. The driven shaft 25 (the braking shaft 8 of the first embodiment) that rotates integrally is slidably fitted. In addition, the code | symbol is abbreviate | omitted about the intermediate shaft 3 and the driven eccentric cam 5b of 1st Embodiment integrally formed in the cam shaft 2 and the eccentric cam 5a. The eccentric cam 5a is slidably fitted on the inner periphery of the spacer 9, and the bearing 24 of the first embodiment is not provided.

  The cam shaft 2 and the driven shaft 25 are each provided with a through hole 2b and an engagement hole 25a penetrating in the radial direction with the same inner diameter, and inserted into the through hole 2b and the engagement hole 25a with a clearance in the circumferential direction. Both end portions of the engaging pin 26 are fixed to a braking inner ring 27 slidably fitted on the outer periphery of the driven shaft 25. A fixed outer ring 16 is disposed on the radially outer side of the brake inner ring 27, and the lock release piece 17 is coupled to rotate integrally with the input shaft 1.

  Further, a plurality of cam surfaces 27a perpendicular to the radial direction are provided on the outer peripheral surface of the brake inner ring 27, and gradually narrow on both sides in the circumferential direction between these cam surfaces 27a and the inner peripheral cylindrical surface of the fixed outer ring 16. A wedge-shaped space 23 similar to that in the first embodiment is formed. As in the first embodiment, each wedge-shaped space 23 is provided with a pair of rollers 18 sandwiching a coil spring 19 that pushes each roller 18 into a narrow portion of the wedge-shaped space 23. Column portions 17a of the lock release pieces 17 are inserted on both sides in the direction.

  When reverse input torque is applied to the camshaft 2 and the eccentric cam 5a from the output side, the cam receiver 7 and the driven shaft 25 rotate slightly together with the camshaft 2 and the eccentric cam 5a, but the driven shaft 25 When the inner wall of the engagement hole 25a comes into contact with the engagement pin 26, the brake inner ring 27 to which the engagement pin 26 is fixed is moved via the roller 18 on the rear side in the rotational direction by the same mechanism as the brake shaft 8 of the first embodiment. Since it is locked to the fixed outer ring 16, the cam shaft 2 and the driven shaft 25 are stopped, and the input shaft 1 integral with the cam shaft 2 does not rotate.

  On the other hand, when input torque is applied to the input shaft 1 from the input side, first, as shown in FIG. 9A, the input shaft 1 slightly rotates, and the column portion of the unlocking piece 17 integrated with the input shaft 1. Since 17a pushes the roller 18 on the rear side in the rotation direction against the elastic force of the coil spring 19 to the wide part of the wedge-shaped space 23, the locked state between the brake inner ring 27 and the fixed outer ring 16 is released. 9B, when the input shaft 1 further rotates, the inner wall of the engagement hole 25a of the driven shaft 25 pushes the engagement pin 26 in the circumferential direction as the cam shaft 2 rotates. The braking inner ring 27 also rotates integrally with the input shaft 1, the cam shaft 2 and the driven shaft 25.

  Therefore, in the second embodiment, when the input torque is applied to the input shaft 1 via the input gear 11 by the action of the reverse input blocking mechanism 4, the braking inner ring 27 is in a free state, and the input shaft 1 Since the cam shaft 2, the driven shaft 25 and the brake inner ring 27 rotate integrally, the spacer 9 revolves due to the eccentric rotation of the eccentric cam 5a and the rotation of the cam receiver 7 as in the first embodiment, and the output outer ring. 6 rotates integrally with the output gear 12, and when reverse input torque is applied to the output outer ring 6 via the output gear 12, the brake inner ring 27 is locked and the camshaft 2 and the driven shaft 25 are stopped. Therefore, similarly to the first embodiment, the spacer 9 rotates between the stopped eccentric cam 5a and the cam receiver 7, and the output outer ring 6 stably idles.

  The torque transmission mechanism of the present invention is not limited to the above-described embodiments, and transmits the revolution torque of the spacer accompanying the eccentric rotation of the eccentric cam to the output outer ring, and the torque of the output outer ring when the eccentric cam is stopped. As long as it has a function of rotating the spacer by rotating the spacer to the spacer.

  The reverse input shut-off mechanism rotates the input shaft and cam shaft for input torque applied from the input side, and does not rotate the input shaft and cam shaft for reverse input torque applied from the output side. For example, a worm mechanism or the like having a self-locking function may be employed.

1 Input shaft 2 Cam shaft 3 Intermediate shaft 4 Reverse input blocking mechanism 5a Eccentric cam 5b Driven eccentric cam 6 Output outer ring 6a Lid 7 Cam receiver 7a Eccentric hole 8 Brake shaft 8a Cam surface 9 Spacer 9a Connection 10 Torque transmission mechanism 11 Input gear 12 Output gear 14 Connecting member 16 Fixed outer ring 17 Unlocking piece 17a Column 18 Roller 19 Coil spring 20 Housing 23 Wedge-shaped space 25 Drive shaft 26 Engaging pin 27 Brake inner ring 27a Cam surface

Claims (4)

The input shaft and the cam shaft are arranged on the same axis and connected so as to be able to transmit rotation, and the cam shaft is provided with a cylindrical eccentric cam having an eccentric axis parallel to the axis, and is provided on the radially outer side of the eccentric cam. An output outer ring is arranged, an eccentric hole having the same axis as the eccentric cam is formed in a cylindrical cam receiver inserted in the inner periphery of the output outer ring, and the eccentric cam is inserted into the eccentric hole. A torque transmission mechanism for fitting a cylindrical spacer between the inner peripheral surface of the eccentric hole of the cam receiver and the outer peripheral surface of the eccentric cam so as to allow relative rotation, and connecting the spacer and the output outer ring so as to transmit torque. And a reverse input blocking mechanism that rotates the input shaft and the cam shaft with respect to input torque applied from the input side and does not rotate the input shaft and the cam shaft with respect to reverse input torque applied from the output side. With
When input torque is applied from the input side, the input shaft and the cam shaft rotate, the eccentric cam rotates eccentrically, and the spacer revolves, whereby torque is transmitted from the spacer through the cam receiver and the torque transmission mechanism. The output outer ring is transmitted,
When a reverse input torque is applied from the output side, the input shaft and the cam shaft do not rotate, and the eccentric cam restricts the revolving motion of the spacer, so that the output outer ring is connected to the spacer via the torque transmission mechanism. Reverse input shut-off clutch that rotates while rotating.   The torque transmission mechanism includes a flange-like connecting portion at one end of the spacer, a lid at one end of the output outer ring, and is sandwiched between the connecting portion of the spacer and the lid of the output outer ring in the axial direction. And a first concave and convex fitting portion extending in the radial direction of the spacer and slidably fitted to each other on the axially opposed surfaces of the connecting portion and the connecting portion of the spacer. And a second concavo-convex fitting that extends in a direction orthogonal to the first concavo-convex fitting portion and is slidably fitted to each other in the axially opposed surfaces of the connecting member and the lid portion of the output outer ring. The reverse input cutoff clutch according to claim 1, wherein the reverse input cutoff clutch is provided with a portion.   The reverse input blocking mechanism is provided with a rotation transmitting means for transmitting the rotation of the input shaft to the cam shaft with a slight angular delay between the input shaft and the cam shaft, and the diameter of the brake shaft that rotates integrally with the cam receiver. A fixed outer ring is arranged on the outer side in the direction, a plurality of cam surfaces are provided on the outer peripheral surface of the braking shaft, and gradually narrowed on both sides in the circumferential direction between the inner peripheral cylindrical surface of the fixed outer ring and each cam surface of the braking shaft. And a pair of rollers and a spring that pushes the roller into the narrow portion of the wedge-shaped space, and a pillar portion that is inserted on both sides in the circumferential direction of each wedge-shaped space. The reverse input cutoff clutch according to claim 1 or 2, wherein the pieces are connected so as to rotate integrally with the input shaft.   The reverse input blocking mechanism integrates the input shaft and the cam shaft, and a driven shaft that rotates integrally with the cam receiver is slidably fitted on the outer periphery of the cam shaft, and is slidably fitted on the outer periphery of the driven shaft. The brake inner ring is provided with an engagement pin that is inserted in the radial direction with a clearance in the circumferential direction on the driven shaft and the cam shaft, a fixed outer ring is arranged on the outer side in the radial direction of the brake inner ring, and a plurality of outer pins are arranged on the outer peripheral surface of the brake inner ring And a wedge-shaped space gradually narrowing on both sides in the circumferential direction is formed between the inner peripheral cylindrical surface of the fixed outer ring and each cam surface of the braking inner ring, and a pair of rollers is provided in each wedge-shaped space. A spring that pushes the roller into the narrow part of the wedge-shaped space is incorporated, and lock release pieces having column portions inserted on both sides in the circumferential direction of each wedge-shaped space are connected to rotate integrally with the input shaft. Claim 1 Reverse input blocking clutch according to the other two.

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