JP2017040288A - Reverse input block clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of noise, vibration and wear, and to surely control the block and transmission of rotation torque.SOLUTION: A reverse input block clutch comprises: an input shaft 11 to which rotation torque is inputted; a fixed outer ring 12 which is constricted in rotation; an output shaft 13 from which the rotation torque is outputted; an engagement piece 14 which is arranged at the output shaft 13, engaged with the fixed outer ring 12 at the block of the rotation torque from the output shaft 13, and released from the fixed outer ring 12 at the transmission of the rotation torque from the input shaft 11; and a pin 15 which is arranged between the input shaft 11 and the output shaft 13, and transmits the rotation torque from the input shaft 11 to the output shaft 13 at the release of the engagement piece 14. The fixed outer ring 12 is formed into a cylindrical shape having an internal peripheral face which can be engaged with and released from the engagement piece 14, the engagement piece 14 is formed into a protrusive shape having an external peripheral face which can be engaged with and released from the fixed outer ring 12, the internal peripheral face of the fixed outer ring 12 is formed of a plurality of recessed curved faces 29 which are continuously formed along a peripheral direction, and the external peripheral face of the engagement piece 14 is formed of a single protrusive curved face 30 which is formed along the peripheral direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reverse input cutoff clutch having a function of transmitting rotational torque input from an input member to an output member while blocking rotational torque input reversely from the output member.

  For example, a device that performs a required operation by transmitting rotational torque input from a drive source to an output side mechanism is required to have a function of holding the output side mechanism so that the position of the output side mechanism does not fluctuate when the drive source is stopped. There is a case. For example, the electric shutter device performs the opening / closing operation of the shutter by inputting the rotational torque in the forward / reverse direction from the drive motor to the opening / closing mechanism on the output side.

  In this electric shutter device, when the driving source stops due to some reason (power failure etc.) during the opening / closing operation of the shutter, when the rotational torque reversely input due to the lowering of the weight of the shutter returns to the input side, May cause damage. Therefore, in the electric shutter device, a mechanism having a function of holding the position of the shutter and preventing the rotational torque reversely input from the shutter from returning to the input side is necessary.

  The present applicant has previously proposed a reverse input cutoff clutch as a mechanism having a function of transmitting rotational torque input from the input member to the output member while blocking reverse rotational torque input from the output member. (For example, refer to Patent Document 1).

  The reverse input shut-off clutch disclosed in Patent Document 1 can be engaged with and disengaged from an input member to which rotational torque is input, a stationary member to which rotation is constrained, an output member from which rotational torque is output, and a stationary member. And an engaging member provided on the output member, and a control means for controlling the interruption and transmission of the rotational torque by engaging and releasing the concave and convex portions of the stationary member and the concave and convex portions of the engaging member.

  In the reverse input cutoff clutch having the above-described configuration, when the rotational torque input from the input member is transmitted, the engaging member of the output member is separated from the stationary member by the control means, thereby engaging with the uneven portion of the stationary member. Release the meshing with the bumps on the goblet. By releasing the engagement of the concave and convex portions, the rotational torque from the input member is transmitted to the output member.

  On the other hand, when the rotational torque reversely input from the output member is interrupted, the engaging portion of the output member is engaged with the stationary member by the control means, thereby engaging the uneven portion of the stationary member with the uneven portion of the engaging member. Due to the engagement of the uneven portions, the output member is locked with respect to the stationary member, and the rotational torque from the output member is cut off so as not to return to the input member.

JP 2013-224692 A

  By the way, in the conventional reverse input cutoff clutch disclosed in Patent Document 1, when the rotational torque reversely input from the output member is cut off, the engaging member of the output member is engaged with the stationary member, thereby causing the unevenness of the stationary member. And the concavo-convex portion of the engaging element are engaged with each other. Further, when transmitting the rotational torque input from the input member, the engagement between the uneven portion of the stationary member and the uneven portion of the engagement member is released by releasing the engagement member of the output member from the stationary member. Yes.

  Thus, in the structure that controls the blocking and transmission of the rotational torque by engaging and releasing the uneven portion of the stationary member and the uneven portion of the engaging member, the protruding portion of the stationary member and the protruding portion of the engaging member interfere with each other. In some cases, the interference between the convex portions causes abnormal noise and vibration. Moreover, there is a possibility that the unevenness of the stationary member and the engaging member may be worn due to the interference between the convex portions.

  Accordingly, the present invention has been proposed in view of the above-described improvements, and its object is to prevent the occurrence of abnormal noise, vibration, and wear, and to reversely control the interruption and transmission of rotational torque. It is to provide an input cutoff clutch.

  The reverse input cutoff clutch according to the present invention is disposed between an input member to which rotational torque is input, a stationary member in which rotation is constrained, an output member from which rotational torque is output, and the stationary member and the output member. Between the input member and the output member, and an engaging member that engages between the two members when the rotational torque from the output member is interrupted and disengages between the two members when the rotational torque is transmitted from the input member. A structure including a torque transmission member that transmits rotational torque from the input member to the output member when the engagement element is disengaged is assumed.

  As technical means for achieving the above-mentioned object, the present invention provides a cylindrical stationary member having an inner peripheral surface that can be engaged with and disengaged from an engagement element, and a convex member having an outer peripheral surface that can be engaged with and disengaged from the stationary member. And the inner peripheral surface of the stationary member is composed of a plurality of concave curved surfaces formed continuously along the circumferential direction, and the outer peripheral surface of the engaging member is along the circumferential direction. It is composed of a single convex curved surface formed.

  In the present invention, the inner peripheral surface of the stationary member is constituted by a plurality of concave curved surfaces continuously formed along the circumferential direction, and the outer peripheral surface of the engagement member is formed by a single member formed along the circumferential direction. Due to the convex curved surface, the engagement element smoothly engages and disengages between the stationary member and the output member. From this, it is possible to suppress abnormal noise, vibration, and wear caused by the engagement of the concavo-convex portions as in the prior art and the interference between the convex portions due to the release thereof. In addition, since the plurality of concave curved surfaces of the stationary member are in contact with the single convex curved surface of the engaging element, it is easy to ensure the torque capacity in the locked state of the output member.

  In the present invention, a concave portion is formed on the outer peripheral surface of the output member, and by inserting the leg portion of the engaging member into the concave portion of the output member, the engaging member can be moved forward and backward with respect to the output member, An R-shaped configuration is desirable. By adopting such a configuration, even when the engagement element is tilted with respect to the output member when the engagement element is advanced or retracted with respect to the output member, the twisting of the engagement element with respect to the output member can be reduced.

  In the present invention, an elastic member that urges an elastic force in a direction to engage the engaging element with the stationary member is interposed between the leg part of the engaging element and the concave part of the output member, and the elastic member is disposed on the leg part of the engaging element. The structure provided with the guide part is desirable. By adopting such a configuration, the posture of the elastic member in the recess of the output member can be stabilized, so that the engagement of the engagement member with respect to the output member can be further alleviated when the engagement member advances and retreats with respect to the output member. be able to.

  The torque transmission member in the present invention is preferably composed of pins that are attached to the output member and arranged so as to come into contact with the input member by rotation of the input member, and the pins are attached to a plurality of locations in the circumferential direction of the output member. By adopting such a configuration, it is easy to ensure the coaxiality between the input member and the output member when the rotational torque is transmitted from the input member, and the rotation of the output member can be stabilized.

  According to the present invention, the inner peripheral surface of the stationary member is constituted by a plurality of concave curved surfaces formed continuously along the circumferential direction, and the outer peripheral surface of the engagement element is formed by a single unit formed along the circumferential direction. By constituting with one convex curved surface, the engagement element smoothly engages and disengages between the stationary member and the output member. From this, it is possible to suppress abnormal noise, vibration, and wear caused by the engagement of the concavo-convex portions as in the prior art and the interference between the convex portions due to the release thereof.

  In addition, since the plurality of concave curved surfaces of the stationary member are in contact with the single convex curved surface of the engaging element, it is easy to ensure the torque capacity in the locked state of the output member. As a result, it is possible to realize a high-quality reverse input cutoff clutch that can prevent abnormal noise, vibration, and wear, and can reliably control the cutoff and transmission of rotational torque.

In an embodiment of the present invention, it is a sectional view showing a reverse input interception clutch. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows the state which the input member contacted the engagement element by rotation of the input member from the state of FIG. It is sectional drawing which shows the state which the input member contacted the pin by rotation of the input member from the state of FIG. It is sectional drawing which shows the state which an output member rotates by rotation of an input member from the state of FIG. It is a principal part expanded sectional view which shows the state which the engaging element engaged with the stationary member. In other embodiment of this invention, it is sectional drawing which shows the reverse input interruption | blocking clutch which made a part of engagement element R shape. In other embodiment of this invention, it is sectional drawing which shows the reverse input interruption | blocking clutch which provided an example of the guide part in the engaging element. It is sectional drawing which shows the reverse input interruption | blocking clutch which provided the other example of the guide part in the engaging element in other embodiment of this invention. It is sectional drawing which shows the reverse input interruption | blocking clutch which provided two pins in the output member in other embodiment of this invention.

  An embodiment of a reverse input cutoff clutch according to the present invention will be described in detail below with reference to the drawings.

  In the following embodiments, a reverse input cut-off clutch incorporated in an electric shutter device that opens / closes a shutter by inputting forward / reverse rotational torque input from a drive source to an output-side opening / closing mechanism will be exemplified. In addition, this reverse input interruption | blocking clutch is applicable to various apparatuses, such as a steering device with a reverse input interruption | blocking function other than an electric shutter apparatus.

  The electric shutter device may be required to have a function of holding the shutter so that the position of the shutter does not fluctuate when the drive source is stopped. The reverse input shut-off clutch of this embodiment is a type called a lock type, and transmits the rotational torque input from the input member to the output member, while locking the rotational torque input reversely from the output member to the input member. It has a reverse input blocking function that prevents it from refluxing.

  As shown in FIGS. 1 and 2, the reverse input cutoff clutch includes an input shaft 11 that is an input member to which rotational torque is input, a fixed outer ring 12 that is a stationary member to which rotation is constrained, and rotational torque that is output. The output shaft 13, which is an output member, is disposed between the fixed outer ring 12 and the output shaft 13, and is engaged between the fixed outer ring 12 and the output shaft 13 when the rotational torque from the output shaft 13 is interrupted. The engaging member 14 is disengaged between the fixed outer ring 12 and the output shaft 13 when the rotational torque is transmitted from the input shaft 11, and is disposed between the input shaft 11 and the output shaft 13, and when the engaging member 14 is disengaged. The main part is composed of a pin 15 which is a torque transmission member for transmitting rotational torque from the input shaft 11 to the output shaft 13.

  The fixed outer ring 12 has a cylindrical shape having an inner peripheral surface that can be engaged with and disengaged from the engagement element 14, and is attached to a housing 17 that supports a motor 16 that is a drive source. The fixed outer ring 12 is arranged coaxially with the output shaft 21 of the motor 16. The inner peripheral surface of the fixed outer ring 12 is composed of a plurality (eight in the figure) of concave curved surfaces 29 formed continuously along the circumferential direction. In this embodiment, the number of the concave curved surfaces 29 is eight, but the number is arbitrary. In this embodiment, each concave curved surface 29 is configured by a single arc surface, but is not limited thereto, and may be configured by a curved surface other than the arc shape.

  The input shaft 11 is disposed inside the fixed outer ring 12 and is rotatably attached to the fixed outer ring 12 by a rolling bearing 18. The input shaft 11 includes a cylindrical portion 19 and a column portion 20 formed integrally with the cylindrical portion 19. The cylindrical portion 19 is coaxially connected to the output shaft 21 of the motor 16 so that torque can be transmitted. The column part 20 is expanded in diameter from the cylindrical part 19 and extends in the axial direction, and a notch 22 is formed at a position facing the circumferential direction 180 °. The engagement element 14 is accommodated in the notch 22. One pillar 20 is provided with a hole 23, and a pin 15 is accommodated in the hole 23.

  The output shaft 13 is rotatably attached to the fixed outer ring 12 by a rolling bearing 24. The output shaft 13 is arranged coaxially with the input shaft 11. The input side end portion 25 of the output shaft 13 is disposed inside the column portion 20 of the input shaft 11, and the output side end portion 26 of the output shaft 13 protrudes from the fixed outer ring 12 in the axial direction. An engagement element 14 and a pin 15 are provided at the input side end 25 of the output shaft 13. The output side end portion 26 of the output shaft 13 is connected to a shutter opening / closing mechanism (not shown) by appropriate means such as a gear so as to transmit torque.

  The engagement element 14 is a member having a cross-sectional mushroom shape and integrally formed with a head part 27 located on the radially outer side and a leg part 28 located on the radially inner side. The head portion 27 of the engagement element 14 is accommodated and disposed in the notch 22 positioned between the column portions 20 of the input shaft 11 with a clearance in the circumferential direction. The outer peripheral surface of the head portion 27 of the engaging element 14 is composed of a single convex curved surface 30 formed along the circumferential direction. The convex curved surface 30 of the head portion 27 of the engaging element 14 is set to have a smaller radius of curvature than one concave curved surface 29 of the fixed outer ring 12.

  The leg portion 28 of the engagement element 14 is inserted along a radial direction through a coil spring 32 that is an elastic member into a recessed hole 31 formed in the outer peripheral surface of the output shaft 13. The coil spring 32 urges the elastic force in a direction in which the convex curved surface 30 of the head portion 27 of the engagement element 14 is brought into contact with the concave curved surface 29 of the fixed outer ring 12, that is, radially outward. In this embodiment, the case where the coil spring 32 is used as the elastic member is illustrated, but other elastic members such as an elastomer can be employed in addition to the coil spring 32.

  The engagement element 14 is provided at a position opposite to the input side end 25 of the output shaft 13 by 180 ° in the circumferential direction. As described above, by disposing the two engaging elements 14 in the opposite directions of 180 °, the engagement with the fixed outer ring 12 can be disengaged with good balance. A tapered surface 33 is formed at the circumferential end of the column portion 20 of the input shaft 11 that contacts the convex curved surface 30 of the engagement element 14 in order to make the contact with the engagement element 14 smooth. In addition, although this embodiment illustrates the case where the two engaging elements 14 are provided, the present invention is not limited to this, and the number of engaging elements 14 is arbitrary.

  The pin 15 is a rod-like member and is attached by press-fitting into a concave hole 34 formed on the outer peripheral surface of the output shaft 13. The protruding end portion of the pin 15 is accommodated and disposed in a hole 23 provided in the column portion 20 of the input shaft 11 with a clearance in the circumferential direction. The pin 15 is disposed at an intermediate 90 ° position between the two engaging elements 14 disposed in the opposite directions of 180 °. As described above, the rotation start timing of the output shaft 13 can be set to be the same in the forward and reverse rotation directions by disposing at the intermediate 90 ° position between the two engagement elements 14.

  In the reverse input cutoff clutch configured as described above, even when rotational torque is reversely input to the output shaft 13, as shown in FIG. 1, the engagement element 14 protrudes radially outward due to the elastic force of the coil spring 32. Therefore, the convex curved surface 30 of the head 27 of the engagement element 14 is in contact with and engaged with the concave curved surface 29 of the fixed outer ring 12. Thereby, the output shaft 13 is locked to the fixed outer ring 12. In this manner, the rotational torque reversely input from the output shaft 13 is locked by the engagement element 14 and the return to the input shaft 11 is blocked.

  In this embodiment, the convex curved surface 30 of the head portion 27 of the engagement element 14 is set to have a smaller radius of curvature than the concave curved surface 29 of the fixed outer ring 12, thereby engaging between the fixed outer ring 12 and the output shaft 13. Although the engaging element 14 is smoothly engaged and disengaged, the convex curved surface 30 of the head 27 of the engaging element 14 may have the same curvature radius as the concave curved surface 29 of the fixed outer ring 12. In this case, the contact area between the head 27 of the engagement element 14 and the fixed outer ring 12 is increased, so that the engagement element 14 can be reliably engaged with the fixed outer ring 12 and the locked state of the output shaft 13 can be easily secured. It becomes.

  On the other hand, as shown in FIG. 3, when the rotational torque in the counterclockwise direction (see the white arrow in the figure) is input from the motor 16 to the input shaft 11, the column portion 20 of the input shaft 11 becomes the head of the engaging element 14. By pressing 27, the engagement element 14 is pushed down radially inward against the elastic force of the coil spring 32. At this time, in the column portion 20 of the input shaft 11, the portion that contacts the convex curved surface 30 of the head portion 27 of the engagement element 14 is a tapered surface 33, so that the engagement of the column portion 20 of the input shaft 11 to the engagement element 14 is performed. The contact can be smoothed to suppress wear and vibration, and the engaging element 14 can be efficiently pushed down radially inward.

  In this way, when the engaging element 14 is pushed down and displaced inward in the radial direction, the convex curved surface 30 of the head 27 of the engaging element 14 is separated from the concave curved surface 29 of the stationary outer ring 12 (FIG. 4). reference). Thereby, the locked state of the output shaft 13 with respect to the fixed outer ring 12 is released, and the output shaft 13 can rotate counterclockwise.

  As shown in FIG. 4, when the column portion 20 of the input shaft 11 contacts the pin 15 protruding from the output shaft 13 and the input shaft 11 further rotates counterclockwise, the counterclockwise rotation from the input shaft 11 is performed. Torque is transmitted to the output shaft 13 via the pin 15, and the output shaft 13 rotates counterclockwise (see FIG. 5).

  When a clockwise rotational torque is input to the input shaft 11, the output shaft 13 rotates in the clockwise direction by the reverse operation to that described above. Accordingly, the rotational torque in the forward and reverse rotational directions from the input shaft 11 is transmitted to the output shaft 13 via the pin 15 and the output shaft 13 rotates in the forward and reverse rotational directions.

  In the reverse input cut-off clutch of this embodiment, a single outer circumferential clutch is formed along the circumferential direction with respect to the inner circumferential surface of the stationary outer ring 12 formed of a plurality of concave curved surfaces 29 that are gently continuous along the circumferential direction. The outer peripheral surface of the engagement element 14 constituted by the convex curved surface 30 is smoothly disengaged. From this, it is possible to suppress abnormal noise, vibration, and wear caused by the engagement of the concavo-convex portions as in the prior art and the interference between the convex portions due to the release thereof.

  Further, when the output shaft 13 is locked, as shown in FIG. 6, the plurality of concave curved surfaces 29 in the fixed outer ring 12 and the single convex curved surface 30 in the engaging member 14 come into contact with each other. It is easy to ensure the torque capacity at 6, θ is a contact angle between the concave curved surface 29 of the fixed outer ring 12 and the convex curved surface 30 of the head 27 of the engaging element 14, P is a normal force applied to the engaging element 14 by a spring load, and F is A vertical component force of the normal force P, and T a horizontal component force of the normal force P.

  The engagement element 14 in the locked state of the output shaft 13 is pressed against the fixed outer ring 12 by the elastic force of the coil spring 32 and receives the normal force P from the fixed outer ring 12 at the contact point. The normal force P generates a frictional force μP in the circumferential direction of the fixed outer ring 12. The engaging element 14 is engaged with the fixed outer ring 12 by this frictional force μP. At this time, the vertical component force F of the normal force P received by the engagement element 14 is represented by F = Pcosθ−μPsinθ, and the horizontal component force T is represented by T = Psinθ + μPcosθ. When the normal force P is eliminated from these two equations, the horizontal component force T is T = (tan θ + μ) / (1−μtan θ) × F.

  The horizontal component T of the normal force P is a holding torque for maintaining the locked state of the output shaft 13. In the above, if the contact angle θ is increased, the holding torque, which is the horizontal component force T, can be increased even if the vertical component force F is constant. The torque capacity in the locked state of the output shaft 13 can be ensured by the increase in the holding torque.

  FIG. 7 shows an overall configuration of a reverse input cutoff clutch according to another embodiment of the present invention. In FIG. 7, the same parts as those in FIG. In this embodiment, the edge 35 of the leg portion 28 of the engagement element 14 has an R shape.

  As described above, the edge 35 of the leg portion 28 of the engaging element 14 is formed in an R shape, so that the concave portion 31 of the output shaft 13 is transmitted when the rotational torque is transmitted from the input shaft 11 and when the rotational torque from the output shaft 13 is interrupted. Even when the engagement element 14 is advanced or retracted, the engagement element 14 can be prevented from being twisted with respect to the output shaft 13 even if the engagement element 14 is inclined with respect to the output shaft 13.

  8 and 9 show an overall configuration of a reverse input cutoff clutch according to another embodiment of the present invention. 8 and 9, the same parts as those in FIG. In this embodiment, the guide portions 36 and 37 of the coil spring 32 are provided on the leg portion 28 of the engagement element 14. The embodiment shown in FIG. 8 has a structure in which the leg portion 28 of the engagement element 14 is formed in a cylindrical shape, and one end of a coil spring 32 is inserted into the cylindrical guide portion 36. The embodiment shown in FIG. 9 has a structure in which a step is provided on the leg portion 28 of the engaging element 14 to have a small diameter, and one end of the coil spring 32 is extrapolated to the small diameter guide portion 37.

  Thus, by providing the guide portions 36 and 37 of the coil spring 32 on the leg portion 28 of the engaging element 14, the posture of the coil spring 32 in the recess 31 of the output shaft 13 can be stabilized. As a result, when the rotational force is transmitted from the input shaft 11 and when the rotational torque from the output shaft 13 is interrupted, the engaging member 14 is twisted with respect to the output shaft 13 when the engaging member 14 moves back and forth in the recess 31 of the output shaft 13. Can be further relaxed. In the embodiment shown in FIGS. 8 and 9 as well, the edge 35 of the leg portion 28 of the engaging element 14 may have an R shape as in the embodiment of FIG.

  FIG. 10 shows an overall configuration of a reverse input cutoff clutch according to another embodiment of the present invention. In FIG. 10, the same parts as those in FIG. In this embodiment, the pins 15 are provided at two positions 180 ° symmetrical with respect to the output shaft 13. That is, a through hole 38 is formed at the center of the output shaft 13, and two pins 15 are press-fitted from both sides of the through hole 38. The protruding end portion of the pin 15 is accommodated in the hole 23 of the column portion 20 of the input shaft 11 with a clearance in the circumferential direction. In this embodiment, the pins 15 are provided at two places in the circumferential direction of the output shaft 13, but the number thereof is arbitrary.

  Thus, by providing the two pins 15 at 180 ° symmetrical positions of the output shaft 13, it is easy to ensure the coaxiality of the input shaft 11 and the output shaft 13 during transmission of the rotational torque from the input shaft 11, and the output The rotation of the shaft 13 can be stabilized. In the embodiment shown in FIG. 10 as well, the edge 35 of the leg portion 28 of the engagement element 14 may have an R shape as in the embodiment of FIG. 7, and as in the embodiment shown in FIGS. Further, the guide portions 36 and 37 of the coil spring 32 may be provided on the leg portion 28 of the engagement element 14.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

11 Input member (input shaft)
12 Static member (fixed outer ring)
13 Output member (output shaft)
14 Engagement 15 Torque transmission member (pin)
28 Leg part 29 Concave curved surface 30 Convex curved surface 31 Concave part 32 Elastic member (coil spring)
35 Edge 36, 37 Guide part

Claims (4)

An input member to which rotational torque is input, a stationary member that is constrained to rotate, an output member that outputs rotational torque, and a rotational torque from the output member that is disposed between the stationary member and the output member. Between the input member and the output member, and an engagement element that engages between the two members when the rotation is interrupted and is disengaged between the two members when the rotational torque is transmitted from the input member. A reverse input cutoff clutch provided with a torque transmission member that transmits rotational torque from the input member to the output member,
The stationary member has a cylindrical shape having an inner peripheral surface that can be engaged with and disengaged from the engaging element, and the engaging element has a convex shape having an outer peripheral surface that can be engaged with and disengaged from the stationary member. The inner circumferential surface is composed of a plurality of concave curved surfaces formed continuously along the circumferential direction, and the outer circumferential surface of the engagement element is a single convex curved surface formed along the circumferential direction. A reverse input cutoff clutch characterized by being configured.   A concave portion is formed on the outer peripheral surface of the output member, and by inserting the leg portion of the engagement element into the concave portion of the output member, the engagement element can be moved forward and backward with respect to the output member, and the edge of the leg portion of the engagement element is formed. The reverse input cutoff clutch according to claim 1, wherein the reverse input cutoff clutch has an R shape.   An elastic member that urges an elastic force in a direction to engage the engaging element with the stationary member is interposed between the leg part of the engaging element and the concave part of the output member, and the elastic member is inserted into the leg part of the engaging element. The reverse input cutoff clutch according to claim 2, further comprising a guide portion.   The said torque transmission member is comprised by the output member, and is comprised by the pin arrange | positioned so that contact with an input member is possible by rotation of the said input member, The said pin was attached to the circumferential direction several places of an output member. 4. The reverse input cutoff clutch according to claim 3.

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