JP2017075625A - Reverse input cutoff clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse input cutoff clutch in which stability in motion is hardly affected even when resin is used as a material of components.SOLUTION: A reverse input cutoff device includes an input member 70 rotating around a rotating shaft, an output member 40 rotating around the rotating shaft, a clutch 50 rotated with the input member 70 around the rotating shaft, and a resisting member applying resistance to rotation of the clutch 50. When the input member 70 and the clutch 50 are located on first relative positions, the clutch 50 and the output member 40 are separated from each other, and when the input member 70 and the clutch 50 are located on second relative positions different from the first relative position in the rotating direction and a rotating shaft direction, the clutch 50 and the output member 40 are engaged with each other. When the rotation of the clutch 50 is delayed with respect to the rotation of the input member 70 when the clutch 50 receives resistance from the resisting member, the input member 70 and the clutch 50 are moved from the first relative positions to the second relative positions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reverse input cutoff clutch that transmits torque applied from the input side to the output side and does not transmit torque applied from the output side to the input side.

  The reverse input cutoff clutch includes an input member that rotates by torque input from the outside, an output member that rotates by rotation of the input member and transmits torque to the outside, and an output member that transmits torque from the input member to the output member And a torque transmission member that does not transmit torque to the input member. Such a reverse input cut-off clutch is incorporated in various devices for home use and business use, and is also incorporated in a device that operates electrically and a device that operates manually.

  Patent Document 1 below discloses a technique related to a reverse input cutoff clutch. The reverse input cutoff clutch disclosed in Patent Document 1 includes an input outer ring as an input member, an output inner ring as an output member, and a plurality of rollers as a torque transmission member disposed between the input outer ring and the output inner ring. It has. The roller is arranged in a gap formed between the input outer ring and the output inner ring arranged concentrically and is held by a cage. The cage is connected to the input outer ring by a centering spring. The gap in which the roller is disposed is formed in a wedge shape having a portion having a larger interval than the diameter of the roller and a portion having a smaller interval than the diameter of the roller. When the input outer ring is not rotating, the roller has a wide portion. Is located. When the input outer ring rotates, the cage connected to the input outer ring by the centering spring also rotates together. However, when the input outer ring rotates to some extent, the cage is indirectly subjected to sliding resistance, and the rotation of the cage is delayed with respect to the rotation of the input outer ring. Since the rotation of the cage is delayed, the relative position of the roller with respect to the input outer ring shifts, and the roller bites into the narrow portion of the gap. That is, the roller is pressed by the input outer ring and the output inner ring. In this state, since the roller is in contact with the input outer ring and the output inner ring, torque applied to the input outer ring is applied to the output inner ring through the roller, and the output inner ring rotates together with the input outer ring.

JP 2003-120715 A

  In the reverse input cutoff clutch disclosed in Patent Document 1 above, as described above, the torque applied to the input outer ring when the roller is pressed by the input outer ring and the output inner ring is transmitted to the output inner ring via the roller. The In order to prevent torque from being transmitted from the output inner ring to the input outer ring after the input outer ring stops rotating, the roller is separated from the narrow part of the wedge-shaped gap and the roller is separated from the input outer ring or the output inner ring. Must be. In order to ensure the separation of the roller, it is preferable that the roller, the input outer ring and the output inner ring are each made of a hard material such as metal. For example, when any of the roller, the input outer ring, and the output inner ring is made of a material having a certain degree of elasticity such as resin, it may be difficult for the roller to separate from the narrow portion of the wedge-shaped gap. Therefore, in the reverse input cutoff clutch disclosed in Patent Document 1, when any of the roller, the input outer ring, and the output inner ring is made of a material having a certain degree of elasticity such as resin, the operation stability is poor. There is.

  However, there is a demand for using a resin as a material for members constituting the reverse input cutoff clutch from the viewpoint of reducing the manufacturing cost and weight of the reverse input cutoff clutch.

  Therefore, the present invention is intended to provide a reverse input cutoff clutch that is less susceptible to the stability of operation even when resin is used as the material of the constituent members.

  In order to solve the above-described problems, a reverse input cutoff clutch according to the present invention includes an input member that rotates about a rotation shaft, an output member that rotates about the rotation shaft, and the input member that rotates about the rotation shaft. And a resistance member that applies resistance to rotation of the clutch, and when the input member and the clutch are in a first relative position, the clutch and the output member are separated, and the input member And the clutch are engaged with each other when the relative position is different from the first relative position in the rotational direction and the rotational axis direction. When the clutch receives resistance and the rotation of the clutch is delayed with respect to the rotation of the input member, the input member and the clutch move from the first relative position to the second relative position. And wherein the door.

  According to the reverse input cutoff clutch of the present invention, when the input member rotates, the clutch engaged with the input member also rotates. When the clutch receives resistance from the resistance member and the rotation of the clutch is delayed with respect to the rotation of the input member, the input member and the clutch move from the first relative position to the second relative position. That is, the relative position of the input member and the clutch in the rotational direction and the rotational axis direction changes, and the clutch moves from a position away from the output member to a position that engages with the output member. As a result, torque is transmitted from the input member to the output member via the clutch, and the output member rotates together with the input member, so that the torque can be transmitted to the outside. Further, when the input member is not rotating, the clutch can be separated from the output member by moving the input member and the clutch to the first relative position, so that torque is transmitted from the output member to the input member. Can not be. According to such a reverse input cutoff clutch of the present invention, the input member and the clutch can be returned from the second relative position to the first relative position even if the input member, the clutch and the output member have elasticity. Easy. Therefore, even if the reverse input cutoff clutch of the present invention uses resin as a material constituting the input member, the clutch, and the output member, the operation stability is hardly affected. Therefore, by using a resin as a material for the members constituting the reverse input cutoff clutch, it is possible to reduce the manufacturing cost and weight of the reverse input cutoff clutch.

The reverse input cutoff clutch according to the present invention includes the input member and the clutch regardless of which direction of rotation the input member moves when the input member and the clutch are in the first relative position. Is preferably moved to the second relative position.
By adopting such a configuration, the clutch can be engaged with the output member regardless of which direction the input member is turned. Therefore, the output member can be rotated when the input member rotates in either direction.

Also, in the reverse input cutoff clutch of the present invention, when it is desired to rotate the output member regardless of which direction the input member rotates, one of the input member and the clutch has a convex portion and the other is engaged with the convex portion. The groove has a pair of groove portions whose ends are connected to each other, the pair of groove portions extend obliquely with respect to the rotation direction, and the convex portion is in one of the groove portions. Is moved in one direction along the rotation axis, and the convex portion moves in the other groove direction in the other rotation direction and moves to the one side along the rotation axis. And the input member and the clutch are in the first relative position when the connecting portion of the pair of groove portions has the convex portion, and the end portions of the pair of groove portions opposite to the connecting portions. When there is a convex part It is preferable that said a member clutch is in said second relative position.
According to the reverse input cutoff clutch of such a form, the input member and the clutch can be moved to the second relative position regardless of which direction the input member rotates. Therefore, the output member can be rotated when the input member rotates in either direction.

In the reverse input cutoff clutch of the present invention, the input member and the clutch are connected only when the input member moves in one rotational direction when the input member and the clutch are in the first relative position. It is also preferable to move to the second relative position.
By adopting such a configuration, the clutch can be engaged with the output member only when the input member moves in one rotational direction. Therefore, the output member can be rotated only when the input member rotates in one direction.

In the reverse input cutoff clutch of the present invention, when the output member is to be rotated only when the input member moves in one rotation direction, one of the input member and the clutch has a convex portion and the other has the convex portion. And the groove extends obliquely with respect to the rotation direction, and the input member and the clutch are connected to the first when the convex portion is at one end of the groove. It is preferable that the input member and the clutch are in the second relative position when the convex portion is at the other end of the groove.
According to the reverse input cutoff clutch of such a form, the input member and the clutch can be moved to the second relative position only when the input member rotates in one direction. Therefore, the output member can be rotated only when the input member rotates in one direction.

The reverse input cutoff clutch of the present invention preferably further includes a rotor that rotates in conjunction with the clutch, and the resistance member adds resistance to the rotation of the rotor.
By setting it as such a form, resistance can be added to rotation of a clutch indirectly via a rotor.

The reverse input shut-off clutch of the present invention preferably further includes a housing that houses the rotor, and a viscous fluid is filled as the resistance member between an outer peripheral surface of the rotor and an inner peripheral surface of the housing.
By using a viscous fluid that applies resistance to the rotor as the resistance member, the clutch is indirectly resisted by the shear resistance of the viscous fluid. In this embodiment, as the rotor rotates faster, a greater resistance can be applied to the rotor rotation. Therefore, if the rotation of the input member is accelerated, the clutch engaged with the input member and the rotor interlocked with the clutch are also rotated, and the resistance applied to the rotation of the rotor is increased. When the resistance applied to the rotation of the rotor increases, the rotation of the clutch tends to be delayed with respect to the rotation of the input member, so that it is easy to maintain the state where the input member and the clutch are in the second relative position. It becomes easy to maintain the state which engaged. That is, in this embodiment, the faster the input member rotates, the easier it is to transmit torque from the input member to the output member via the clutch.

In addition, when a viscous fluid is used as the resistance member as described above in the reverse input cutoff clutch of the present invention, the input member and the clutch are connected when the input member and the clutch are in the second relative position. It is preferable to further include elastic bodies that bias the opposite directions in the rotational direction.
In order to prevent torque from being transmitted from the output member to the input member after the input member stops rotating, the clutch and the output member may be separated from each other. That is, the input member and the clutch may be moved from the second relative position to the first relative position so that the clutch and the output member are separated from each other. Here, by using a viscous fluid that adds resistance to the rotation of the rotor as the resistance member, no resistance is applied from the resistance member to the rotor when the rotor is stopped, and when the rotor starts rotating or when the rotor rotates slowly The resistance applied to the rotor from the resistance member is reduced. Therefore, when the rotor is rotated again from the state where the rotation of the input member is stopped and the rotation of the rotor is stopped, the rotor and the clutch interlocking with the rotor can be rotated with a weak force. Therefore, by using an elastic body that urges the input member and the clutch to the opposite sides when the input member and the clutch are in the second relative position, the elastic body is attached after the input member stops rotating. The clutch can be rotated by the force, and the input member and the clutch can be automatically returned from the second relative position to the first relative position.

In the reverse input cutoff clutch of the present invention, it is also preferable that the resistance member is a member that applies sliding resistance.
When a member that applies sliding resistance is used as the resistance member, a large resistance is applied to the clutch from the beginning. Therefore, since the rotation of the clutch is easily delayed from the rotation of the input member from the beginning of the input member rotating, the relative position between the input member and the clutch is shifted from the beginning of the rotation of the input member, and the clutch and the output member are shifted. And engage. Therefore, by using a member that applies sliding resistance as the resistance member, it becomes easier to transmit torque to the output member from the beginning when the input member starts to rotate.

  As described above, according to the reverse input cutoff clutch of the present invention, even when resin is used as the material of the constituent member, the stability of operation is not easily affected.

It is a disassembled perspective view of the reverse input interruption | blocking clutch which concerns on embodiment of this invention. It is a disassembled perspective view which sees the reverse input interruption | blocking clutch shown in FIG. 1 from a different direction. It is a perspective view of an input member. It is a perspective view which sees an input member from other directions. It is a perspective view of a clutch. It is a perspective view which sees a clutch from another direction. It is a perspective view which sees a clutch from the other direction. It is a perspective view of a torsion spring. It is a perspective view of an output member. It is a perspective view which looks at an output member from other directions. It is a perspective view of a rotor. It is sectional drawing containing the rotating shaft of a rotor. It is a perspective view of a housing. It is a side view of a reverse input cutoff clutch. It is sectional drawing which passes along the rotating shaft of a reverse input interruption | blocking clutch, Comprising: It is a figure which shows the state which the clutch has spaced apart from the output member. It is a side view of a reverse input cutoff clutch, Comprising: It is a figure which shows the state which has separated the clutch from the output member. It is a B-B 'cross section arrow shown in Drawing 14 when a clutch has separated from an output member. It is sectional drawing which passes along the rotating shaft of a reverse input interruption | blocking clutch, Comprising: It is a figure which shows the state which the clutch is engaging with the output member. It is a side view of a reverse input cutoff clutch, Comprising: It is a figure which shows the state which the clutch is engaging with the output member. It is a B-B 'cross section arrow shown in Drawing 14 when a clutch is engaging with an output member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a reverse input cutoff clutch according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of the reverse input cutoff clutch according to the present embodiment. FIG. 2 is an exploded perspective view of the reverse input cutoff clutch according to the present embodiment as viewed from a direction different from that in FIG. In FIG. 1, FIG. 2, and each figure shown below, a part of reference numerals may be omitted for easy viewing.

  The reverse input shut-off clutch 1 of the present embodiment includes a housing 10, a rotor 20, a first seal member 30, an output member 40, a clutch 50, a torsion spring 60, an input member 70, a rotor cap 80, a second seal member 35, and a housing cap. 90 and a viscous fluid not shown. Among these members, the members excluding the viscous fluid are arranged along the rotation axis indicated by the alternate long and short dash line in FIGS. 1 and 2. In addition, the rotor 20, the output member 40, the clutch 50, the torsion spring 60, and the input member 70 are configured to be rotatable with respect to the housing 10 around a rotation axis indicated by a one-dot chain line in FIGS. Hereinafter, these constituent members will be described in detail. In the following description, the rotation axis means a rotation axis indicated by a one-dot chain line in FIGS. 1 and 2, the rotation axis direction means a direction in which the rotation axis extends, and the rotation direction means the rotation. A direction that rotates around an axis is meant, and a radial direction means a direction perpendicular to the axis of rotation.

  FIG. 3 is a perspective view of the input member 70. FIG. 4 is a perspective view of the input member 70 viewed from another direction. The input member 70 is a member that rotates around a rotation axis by a torque applied from the outside. The input member 70 has a cylindrical small-diameter cylindrical portion 72 having a notch 71 formed at one end, and torque is applied from a rod-like or plate-like member engaged with the notch 71, The input member 70 rotates.

  The input member 70 has a large-diameter cylindrical portion 73 formed so as to cover an end portion of the small-diameter cylindrical portion 72 opposite to the side where the notch 71 is formed. The large-diameter cylindrical portion 73 has a bottomed cylindrical shape having a cylindrical first side surface portion 76 centering on the rotation axis and a bottom surface portion 77 formed at the end of the first side surface portion 76 on the notch 71 side. It is a part of the body. The bottom surface portion 77 has a through hole at the center, and the small diameter cylindrical portion 72 passes through the through hole, and the bottom surface portion 77 and the small diameter cylindrical portion 72 are integrated. In addition to the above-described through hole formed in the central portion, other through holes 78 and 79 are formed in the bottom surface 77 at positions facing each other with the through hole interposed therebetween. The through holes 78 and 79 are holes for easily forming the inner shape of the first side surface portion 76 including the first locking piece 75 described later. A guide portion 74 is formed outside the first side surface portion 76. The guide portion 74 is a convex portion that protrudes radially outward from the first side surface portion 76. In the input member 70 of the present embodiment, four guide portions 74 are formed, but the number of guide portions 74 is not particularly limited, and an appropriate number of guide portions 74 are formed according to the size of the input member 70 and the like. Is done.

  A first locking piece 75 is formed between the inner peripheral surface of the first side surface portion 76 and the outer peripheral surface of the small diameter cylindrical portion 72. The first locking piece 75 is erected from the bottom surface portion 77 in a direction parallel to the rotation axis. The shape of the cross section perpendicular to the rotation axis direction of the first locking piece 75 is a semicircular arc shape. However, a protruding portion 75 a that protrudes in the rotational direction on the opposite side of the bottom surface portion 77 is formed at one end of the first locking piece 75 in the rotational direction.

  FIG. 5 is a perspective view of the clutch 50. FIG. 6 is a perspective view of the clutch 50 viewed from another direction. FIG. 7 is a perspective view of the clutch 50 as seen from the other direction. The clutch 50 is a member that rotates together with the input member 70 around the rotation axis and transmits torque from the input member 70 to the output member 40 as described later. The clutch 50 is a bottomed cylindrical member having a cylindrical second side surface portion 51 having a rotation axis as a central axis and a bottom surface portion 52 provided at an end portion of the second side surface portion 51. A through hole 53 is formed at the center of the bottom surface portion 52, and a first clutch portion 56 is formed around the through hole 53 on the outer surface of the bottom surface portion 52. The first clutch portion 56 is a portion where a plurality of concave portions and convex portions extending along the radial direction are alternately arranged in parallel along the rotational direction. A through hole 59 is formed in the bottom surface portion 52. The through hole 59 is a hole for easily forming the inner shape of the second side surface portion 51 including the second locking piece 55 described later.

In addition, the second side surface portion 51 has a guide groove 54 that engages with the guide portion 74 of the input member 70. The guide groove 54 has a first groove portion 541 and a second groove portion 542 which are a pair of groove portions whose end portions are connected. The pair of groove portions 541 and 542 extend obliquely with respect to the rotation direction. Also,
When the guide part 74 moves in the first groove part 541 in one rotation direction, it moves to one side along the rotation axis, and when the guide part 74 moves in the second groove part 542 in the other rotation direction, it follows the rotation axis. A pair of groove parts 541 and 542 are formed so as to move to the one side. That is, the guide groove 54 has one end portion of the first groove portion 541 and one end portion of the second groove portion 542 connected to each other at the central portion 54a in the rotation direction, and the other end of the first groove portion 541 from the central portion 54a. It extends in a direction away from the bottom surface portion 52 toward the other end portion 54 c of the end portion 54 b and the second groove portion 542. An introduction groove 58, which is a groove extending in a direction parallel to the rotation axis, is connected to the end portion 54 b of the first groove portion 541. The introduction groove 58 is opposite to the bottom surface portion 52 of the second side surface portion 51. It extends to the end of the side. In the clutch 50 of the present embodiment, the guide groove 54 and the introduction groove 58 are grooves that penetrate from the inner peripheral surface side to the outer peripheral surface side of the second side surface portion 51. May be a groove that can be engaged with the guide portion 74, and may be a groove that is formed on the inner peripheral surface side of the second side surface portion 51 and does not penetrate.

  Further, an engaging convex portion 57 is formed on the second side surface portion 51. The engaging convex portion 57 is a convex portion that protrudes radially outward from the second side surface portion 51. The engaging convex portion 57 engages with an engaging concave portion 27 of the rotor 20 described later.

  Furthermore, a second locking piece 55 is formed inside the second side surface portion 51. The second locking piece 55 is erected from the bottom surface portion 52 in a direction parallel to the rotation axis. The shape of the cross section perpendicular to the rotation axis direction of the second locking piece 55 is a semicircular arc shape. However, a protruding portion 55 a that protrudes in the rotational direction on the opposite side of the bottom surface portion 52 is formed at one end portion in the rotational direction of the second locking piece 55. In addition, the direction in which the protrusion 75a protrudes and the direction in which the protrusion 55a protrudes are opposite to each other in the rotation direction.

  FIG. 8 is a perspective view of the torsion spring 60. The torsion spring 60 includes a spiral portion 61 made of a spirally wound wire and two locking portions 62a and 62b formed by bending both ends of the wire constituting the spiral portion 61 radially outward. It is an elastic body.

  FIG. 9 is a perspective view of the output member 40. FIG. 10 is a perspective view of the output member 40 viewed from another direction. The output member 40 is a member that rotates about a rotation shaft and transmits torque to the outside. The output member 40 includes a disk-shaped disk portion 41 and a cylindrical portion 42 and a cylindrical portion 43 that are erected from the center portion of the disk portion 41. The cylindrical part 42 is a cylindrical part centering on the rotation axis, and is erected in the direction of the rotation axis from one surface of the disk part 41. The cylindrical portion 43 is a cylindrical portion centered on the rotation axis, and is erected from the other surface of the disk portion 41 in the rotation axis direction.

  A second clutch portion 46 is formed around the cylindrical portion 43 on the surface of the disc portion 41 on the side where the cylindrical portion 43 stands. The second clutch part 46 is a part in which a plurality of concave parts and convex parts extending along the radial direction of the disk part 41 are alternately arranged in parallel along the rotational direction. The second clutch portion 46 engages with the first clutch portion 56 of the clutch 50 as will be described later.

  On the other hand, the surface 45 opposite to the second clutch portion 46 of the disk portion 41 is a smooth surface. The hollow portion of the cylindrical portion 42 erected on the smooth surface 45 side has a cross-sectional shape perpendicular to the rotation axis direction in which a part of a circle is cut out. By inserting a rod-shaped member that matches the shape of the hollow portion into the hollow portion, torque is output to the outside through the rod-shaped member when the output member 40 rotates.

  FIG. 11 is a perspective view of the rotor 20. FIG. 12 is a cross-sectional view including the rotation axis of the rotor 20. The rotor 20 has a cylindrical side surface portion 26. A plurality of steps are formed on the inner side of the side surface portion 26 by a plurality of surfaces extending in the radial direction, and the inner diameter of the side surface portion 26 gradually decreases from one opening portion 24 toward the other opening portion 25. It has become. Specifically, a first surface 21a, a second surface 22a, and a third surface 23a extending in the radial direction from one opening 24 to the other opening 25 are formed in this order. A cylindrical first inner peripheral surface 21b is formed between the opening 24 and the first surface 21a, and a cylindrical second inner peripheral surface is formed between the first surface 21a and the second surface 22a. 22b is formed, and a cylindrical third inner peripheral surface 23b is formed between the second surface 22a and the third surface 23a.

  The rotor 20 is a cylindrical member that rotates in conjunction with the clutch 50, and an engagement recess 27 that engages with the engagement protrusion 57 of the clutch 50 is formed on the second inner peripheral surface 22b. The engaging recess 27 is a recess extending from the first surface 21a in a direction parallel to the rotation axis. The engaging convex portion 57 is inserted from the first surface 21 a side of the engaging concave portion 27 and engaged therewith. As shown in FIGS. 6 and 7, the clutch 50 of the present embodiment has four engaging convex portions 57, and four engaging concave portions 27 are formed according to the number of engaging convex portions 57. However, only two engagement recesses 27 appear in FIG. However, the numbers of the engagement concave portions 27 and the engagement convex portions 57 are not particularly limited.

  Further, a guide groove portion 28 having a plurality of grooves is formed on the opening 24 side in the outer peripheral surface of the side surface portion 26. The guide groove portion 28 is a portion where a plurality of grooves parallel to the rotation axis direction are formed. Of the outer peripheral surface of the rotor 20, the surface 29 on the opening 25 side where the guide groove portion 28 is not formed is a smooth surface.

  FIG. 13 is a perspective view of the housing 10. The housing 10 is a bottomed cylindrical member having a cylindrical side surface portion 11 and a bottom surface portion 12 provided at one end of the side surface portion 11. A fixing portion 13 that protrudes radially outward is formed on the outer peripheral surface of the side surface portion 11. By fixing the fixing portion 13 to a device provided with the reverse input cutoff clutch 1 by a known fixing means such as a screw, the reverse input cutoff clutch 1 is fixed to the device.

  Further, a guide groove portion 15 having a plurality of grooves is formed in a portion of the inner peripheral surface of the side surface portion 11 on the bottom surface portion 12 side. The guide groove portion 15 is a portion where a plurality of grooves parallel to the rotation axis direction are formed. Of the inner peripheral surface of the side surface portion 11, the surface 16 on the opening 18 side where the guide groove portion 15 is not formed is a smooth surface.

  Furthermore, a cylindrical cylindrical portion 14 is formed in the center of the bottom surface portion 12 inside the housing 10 so as to stand in the direction of the rotation axis and have the rotation axis as the central axis.

  Next, while explaining the state in which the members constituting the reverse input cutoff clutch 1 are assembled, the components of the reverse input cutoff clutch 1 that have not been described so far will be described. FIG. 14 is a side view of the reverse input cutoff clutch 1. FIG. 15 is a cross-sectional view taken along the line A-A ′ shown in FIG. 14, that is, a cross-section passing through the rotation shaft of the reverse input cutoff clutch 1, and shows a state where the clutch 50 is separated from the output member 40. FIG. 16 is a side view of the reverse input cutoff clutch 1 and shows a state where the clutch 50 is separated from the output member 40. In FIG. 16, for convenience of explanation, the rotor 20, the housing 10, and the housing cap 90 are omitted. 17 is a cross-sectional view taken along the line B-B ′ shown in FIG. 14 when the clutch 50 is separated from the output member 40.

  The rotor 20 is accommodated in the housing 10 such that the outer surface on the opening 25 side is in contact with the inner surface of the bottom surface portion 12 of the housing 10. Further, the cylindrical portion 14 of the housing 10 is inserted into the opening 25 of the rotor 20. The outer diameter of the cylindrical portion 14 and the inner diameter of the opening 25 are approximately the same size. Accordingly, the rotor 20 is prevented from shaking in the radial direction when rotating. Further, the guide groove 15 of the housing 10 and the smooth surface 29 of the rotor 20 face each other, and the smooth surface 16 of the housing 10 and the guide groove 28 of the rotor 20 face each other. By forming the inner peripheral surface of the housing 10 and the outer peripheral surface of the rotor 20 in this way, it becomes easy to inject a viscous fluid as a resistance member between the inner peripheral surface of the housing 10 and the outer peripheral surface of the rotor 20.

  Although not shown in the drawing, a viscous fluid is filled between the guide groove 15 and the smooth surface 16 of the housing 10 and the smooth surface 29 and the guide groove 28 of the rotor 20 as a resistance member that adds resistance to the rotation of the rotor 20. . As this viscous fluid, it is preferable to use silicone oil from the viewpoint of, for example, a small change in viscosity due to temperature.

  The output member 40 is accommodated in the rotor 20 so that the smooth surface 45 of the disk portion 41 is in contact with the second surface 22a of the rotor 20. As will be described later, since the cylindrical portion 43 of the output member 40 is pressed by the input member 70, the smooth surface 45 is pressed against the second surface 22a, and the position of the output member 40 in the rotation axis direction is fixed. Since the output member 40 rotates while the smooth surface 45 is in contact with the second surface 22a, the second surface 22a is a thrust bearing surface. Further, the cylindrical portion 42 of the output member 40 is inserted into the cylindrical portion 14 of the housing 10. The outer diameter of the cylindrical portion 42 and the inner diameter of the cylindrical portion 14 are substantially the same size. Therefore, the cylindrical portion 14 is used as a bearing, and the output member 40 is prevented from shaking in the radial direction when rotating.

  The first seal member 30 is a circular member, and is formed by the third surface 23 a and the third inner peripheral surface 23 b of the rotor 20, the outer peripheral surface of the cylindrical portion 14 of the housing 10, and the smooth surface 45 of the output member 40. It arrange | positions so that these members may be contacted in space. By arranging the first seal member 30 in this way, viscous fluid injected between the outer peripheral surface of the rotor 20 and the inner peripheral surface of the housing 10 leaks from the housing 10 to the outside or enters the rotor 20 inside. Intrusion is prevented.

  The clutch 50 is accommodated in the rotor 20 so that the first clutch portion 56 faces the second clutch portion 46 of the output member 40. Further, the cylindrical portion 43 of the output member 40 is inserted into the through hole 53 of the bottom surface portion 52 of the clutch 50. The inner diameter of the through hole 53 and the outer diameter of the cylindrical portion 43 are substantially the same size. Therefore, the rotation shaft of the clutch 50 and the rotation shaft of the output member 40 are the same, and the clutch 50 is prevented from shaking in the radial direction when rotating.

  Although not shown in the drawing, the engaging convex portion 57 of the clutch 50 engages with the engaging concave portion 27 of the rotor 20. The width of the engaging recess 27 in the rotational direction is substantially the same as the width of the engaging convex portion 57 in the rotational direction, and the length of the engaging concave portion 27 in the direction parallel to the rotation axis is the rotation of the engaging convex portion 57. It is formed longer than the length in the direction parallel to the axis. Therefore, when the engaging convex portion 57 and the engaging concave portion 27 are engaged, the clutch 50 rotates in conjunction with the rotor 20, and the clutch 50 can be moved relative to the rotor 20 in the rotation axis direction. Become.

  A part of the input member 70 including the large-diameter cylindrical portion 73 is accommodated in the rotor 20. Further, the input member 70 is arranged so that the notch 71 protrudes from the rotor 20 and the housing 10, and the end surface of the small diameter cylindrical portion 72 opposite to the notch 71 is in contact with the end surface of the cylindrical portion 43 of the output member 40. Is accommodated in the rotor 20. And the bottom face part 77 of the large diameter cylindrical part 73 is pressed against the output member 40 side by a rotor cap 80 described later. Thereby, the relative position in the rotating shaft direction of the input member 70 and the output member 40 is fixed.

  In addition, the input member 70 includes the second locking piece 55 of the clutch 50 disposed between the first locking piece 75 and the first side surface portion 76, and the second side surface portion 51 of the clutch 50 and the second engagement portion. The clutch is combined with the clutch 50 so that the first side surface portion 76 is disposed between the stopper piece 55 and the stopper piece 55. Furthermore, the first locking piece 75 and the second locking piece 55 are arranged so as to overlap in the radial direction.

  Further, the guide portions 74 of the input member 70 are respectively inserted into the guide grooves 54 from the introduction grooves 58 of the clutch 50 and engage with the guide grooves 54. When the guide portion 74 and the guide groove 54 are engaged, the guide portion 74 moves along the guide groove 54. That is, the clutch 50 is engaged with the input member 70 such that the relative position with the input member 70 in the rotation axis direction changes according to the relative position with the input member 70 in the rotation direction. In the state where the input member 70 is not rotating, the guide portion 74 is positioned at the central portion 54a of the guide groove 54 as shown in FIG. 16, and when the input member 70 and the clutch 50 are in this positional relationship, the clutch 50 is located. Is spaced from the output member 40. The relative position between the input member 70 and the clutch 50 when the clutch 50 and the output member 40 are thus separated is referred to as a first relative position. On the other hand, the relative position between the input member 70 and the clutch 50 when the clutch 50 and the output member 40 are engaged is referred to as a second relative position. The relative position between the input member 70 and the clutch 50 is different between the first relative position and the second relative position in the rotational direction and the rotational axis direction.

  The torsion spring 60 is disposed such that the spiral portion 61 is positioned between the outer peripheral surface of the small diameter cylindrical portion 72 of the input member 70 and the first locking piece 75. When the clutch 50 is separated from the output member 40, that is, when the input member 70 and the clutch 50 are in the first relative position, the locking portions 62a and 62b are respectively connected to the first locking piece 75 and The second locking piece 55 is in contact with the rotation direction end. The locking portion 62a is disposed between the bottom surface portion 52 of the clutch 50 and the protruding portion 55a of the second locking piece 55, and the locking portion 62b is connected to the bottom surface portion 77 of the large-diameter cylindrical portion 73 and the first engagement. By disposing it between the protrusion 75a of the stop piece 75, the torsion spring 60 is prevented from being displaced in the direction of the rotation axis.

  The rotor cap 80 is a member that seals the opening 24 of the rotor 20. The rotor cap 80 includes a disk-shaped disk part 81 and a cylindrical part 82 that is erected in the direction of the rotation axis from the center of the disk part 81. Further, a groove along the rotation direction is formed in the outer peripheral portion of the disk portion 81, and a ring-shaped seal member 83 is disposed in the groove. The opening 24 is sealed by arranging the rotor cap 80 so that the seal member 83 is pressed against the first inner peripheral surface 21 b of the rotor 20. Further, the small diameter cylindrical portion 72 of the input member 70 is inserted into the cylindrical portion 82. The inner diameter of the cylindrical portion 82 and the outer diameter of the small diameter cylindrical portion 72 are substantially the same size. Therefore, the cylindrical portion 82 serves as a bearing, and the input member 70 is prevented from shaking in the radial direction when rotating.

  The housing cap 90 is a member that seals the opening 18 of the housing 10. The housing cap 90 is a disk-shaped member having a through hole 91 (see FIGS. 1 and 2) at the center. The housing cap 90 has a recess 92 around the through hole 91 on the inner surface of the housing 10. Further, a groove along the rotation direction is formed in the outer peripheral portion of the housing cap 90, and a ring-shaped seal member 93 is disposed in the groove. By arranging the housing cap 90 so that the seal member 93 is pressed against the inner peripheral surface of the housing 10, the opening 18 is sealed. Further, the cylindrical portion 82 of the rotor cap 80 is inserted into the through hole 91. The inner diameter of the through hole 91 and the outer diameter of the cylindrical portion 82 are substantially the same size.

  The second seal member 35 is a circular member, and is disposed in contact with these members in a space formed by the rotor cap 80 and the recess 92 of the housing cap 90. By disposing the second seal member 35 in this manner, the viscous fluid injected between the outer peripheral surface of the rotor 20 and the inner peripheral surface of the housing 10 is prevented from leaking from the housing 10 to the outside.

  Next, the operation of the reverse input cutoff clutch 1 will be described. 18 is a cross-sectional view taken along the line A-A ′ shown in FIG. 14, that is, a cross-section passing through the rotation shaft of the reverse input cutoff clutch 1, and shows a state where the clutch 50 is engaged with the output member 40. FIG. 19 is a side view of the reverse input cutoff clutch 1 and shows a state in which the clutch 50 is engaged with the output member 40. In FIG. 19, for convenience of explanation, the rotor 20, the housing 10, and the housing cap 90 are omitted. FIG. 20 is a cross-sectional view taken along the line B-B ′ shown in FIG. 14 when the clutch 50 is engaged with the output member 40.

  Before the input member 70 starts to rotate, the locking portions 62a and 62b of the torsion spring 60 are locked to the rotation direction end portions of the first locking piece 75 and the second locking piece 55, respectively. In a state before the input member 70 starts to rotate, the relative position between the input member 70 and the clutch 50 is adjusted by the biasing force of the torsion spring 60, and the guide portion 74 is located at the center portion of the guide groove 54 as shown in FIG. 54a. Thus, when the input member 70 and the clutch 50 are in the first relative position, the clutch 50 is separated from the output member 40, and the second clutch portion 46 of the output member 40 and the first clutch portion 56 of the clutch 50. Are not engaged. Therefore, even if the output member 40 rotates, the torque is not transmitted to the input member 70.

  As described above, when the input member 70 starts to rotate from the state where the input member 70 and the clutch 50 are in the first relative position, the torsion spring 60, the clutch 50, and the rotor 20 also rotate. When the rotational speed of the input member 70 reaches a certain level, the shear resistance received by the rotor 20 from the viscous fluid that is a resistance member interposed between the housing 10 and the rotor 20 increases. When the resistance force that the rotor 20 receives from the resistance member exceeds the elastic force of the torsion spring 60, the torsion spring 60 bends and the rotation of the rotor 50 and the clutch 50 that rotates in conjunction with the rotor 20 changes to the rotation of the input member 70. It is late for. As described above, when the rotation of the clutch 50 is delayed with respect to the rotation of the input member 70, the guide portion 74 moves in the guide groove 54 toward the end portion in the rotation direction. Details are as follows. Since the guide portion 74 and the guide groove 54 are engaged with each other, when the relative position between the input member 70 and the clutch 50 in the rotational direction is shifted, the guide portion 74 extends from the central portion 54a to the end portion 54b along the guide groove 54. Or it moves to the edge part 54c. Whether the guide portion 74 moves toward the end portion 54b or the end portion 54c depends on the rotation direction of the input member 70. In the example shown in FIGS. 19 and 20, the input member 70 is rotated in the counterclockwise direction when the reverse input cutoff clutch 1 is viewed from the side where the notch 71 of the input member 70 projects, and the guide The part 74 has moved to the end 54c side. When the guide portion 74 moves to the end portion 54c of the guide groove 54, the clutch 50 moves away from the input member 70 in the rotation axis direction and moves to the output member 40 side. Then, the first clutch portion 56 of the clutch 50 is pressed against the second clutch portion 46 of the output member 40 and meshes. Thus, when the clutch 50 receives resistance from the resistance member and the rotation of the clutch 50 is delayed with respect to the rotation of the input member 70, the input member 70 and the clutch 50 are moved from the first relative position to the second relative position. Moving. Then, the input member 70, the torsion spring 60, the clutch 50, the output member 40 and the rotor 20 rotate together, and the torque of the input member 70 is transmitted to the output member 40 via the clutch 50.

  According to the reverse input cutoff clutch 1, by using a viscous fluid that applies resistance to the rotor 20 as the resistance member, the clutch 50 receives resistance indirectly due to the shear resistance of the viscous fluid. In this embodiment, as the rotation of the rotor 20 becomes faster, a larger resistance can be applied to the rotation of the rotor 20. Therefore, if the rotation of the input member 70 is accelerated, the rotation of the clutch 50 engaged with the input member 70 and the rotor 20 interlocked with the clutch 50 is also accelerated, and the resistance applied to the rotation of the rotor 20 is increased. When the resistance applied to the rotation of the rotor 20 is increased, the rotation of the clutch 50 is likely to be delayed with respect to the rotation of the input member 70, so that the state where the input member 70 and the clutch 50 are in the second relative position is easily maintained. It becomes easy to maintain the state in which the clutch 50 and the output member 40 are engaged. That is, in this embodiment, the faster the input member 70 rotates, the easier it is to transmit torque from the input member 70 to the output member 40 via the clutch 50. Here, by using silicone oil or the like that has a small viscosity change due to temperature as a viscous fluid, even if the temperature of the viscous fluid changes, the resistance applied to the rotation of the rotor 20 from the viscous fluid is suppressed. Therefore, even when the temperature of the viscous fluid changes, the change in the rotational speed of the input member 70 required when the clutch 50 and the output member 40 are engaged is suppressed.

  Further, in order to prevent torque from being transmitted from the output member 40 to the input member 70 after the rotation of the input member 70 stops, the clutch 50 and the output member 40 may be separated from each other. That is, the input member 70 and the clutch 50 may be moved from the second relative position to the first relative position so that the clutch 50 and the output member 40 are separated from each other. When the rotation of the input member 70 stops, the torsion spring 60, the clutch 50, the output member 40, and the rotor 20 also stop. At this time, the shearing resistance applied to the rotor 20 from the viscous fluid interposed between the inner peripheral surface of the housing 10 and the outer peripheral surface of the rotor 20 disappears. In this state, since the torsion spring 60 is bent as described above, the first locking piece 75 and the second locking piece 55 are biased by the force acting when the torsion spring 60 tries to return to the original state. Is done. That is, when the clutch 50 is in a position where it engages with the output member 40, the input member 70 and the clutch 50 are urged to opposite sides in the rotational direction by the torsion spring 60. The urging force of the torsion spring 60 causes the clutch 50 to rotate so that the guide portion 74 is positioned at the central portion 54 a of the guide groove 54, and the first clutch portion 56 of the clutch 50 is the second clutch portion 46 of the output member 40. Detached from.

  As described above, by using the viscous fluid as the resistance member, when the rotation of the rotor 20 is stopped, no resistance is applied from the resistance member to the rotor 20, and when the rotor 20 starts to rotate or when the rotation of the rotor 20 is slow. The resistance applied to the rotor 20 from the resistance member is reduced. Therefore, when the rotor 20 is rotated again from the state where the rotation of the input member 70 is stopped and the rotation of the rotor 20 is stopped, the rotor 20 and the clutch 50 interlocking with the rotor 20 can be rotated with a weak force. Therefore, when the input member 70 and the clutch 50 are in the second relative position, the rotation of the input member 70 is stopped by using the torsion spring 60 that biases the input member 70 and the clutch 50 to the opposite sides. Later, the clutch 50 can be rotated by the biasing force of the torsion spring 60, and the input member 70 and the clutch 50 can be automatically returned from the second relative position to the first relative position.

  According to such a reverse input cutoff clutch 1, even if the input member 70, the clutch 50, and the output member 40 have elasticity, the input member 70 and the clutch 50 are moved from the second relative position to the first relative position. Easy to return. Therefore, even if the reverse input cutoff clutch 1 uses resin as a material constituting the input member 70, the clutch 50, and the output member 40, the operation stability is not easily affected. Therefore, by using a resin as a material for the members constituting the reverse input cutoff clutch 1, it is possible to reduce the manufacturing cost and weight of the reverse input cutoff clutch 1.

  In the description of the reverse input cutoff clutch according to the present invention so far, the configuration in which the input member 70 has the guide portion 74 and the clutch 50 has the guide groove 54 that engages with the guide portion 74 has been described. However, the present invention is not limited to such a configuration, and the clutch may have a guide portion and the input member may have a guide groove that engages with the guide portion.

  Further, in the description of the reverse input cutoff clutch according to the present invention so far, when the input member 70 and the clutch 50 are in the first relative position, the input member 70 and the clutch are rotated regardless of which direction the input member 70 rotates. 50 has been described as moving to the second relative position. With this configuration, the clutch 50 is engaged with the output member 40 regardless of which direction the input member 70 rotates about the rotation axis. Therefore, the output member 40 can be rotated when the input member 70 rotates in either direction. However, this invention is not limited to the form which concerns, According to the use of a reverse input interruption | blocking clutch, the form which can rotate an output member only when an input member rotates to one side of a rotation direction may be sufficient. That is, the input member and the clutch may move to the second relative position only when the input member rotates in one of the rotational directions when the input member and the clutch are in the first relative position. In this case, one of the input member and the clutch has a convex portion and the other has a guide groove that engages with the convex portion, the guide groove extends obliquely with respect to the rotation direction, and is provided at one end of the guide. The input member and the clutch are in the first relative position when there is a convex portion, and the input member and the clutch are in the second relative position when there is a convex portion at the other end of the guide groove. be able to. For example, the guide groove 54 described above may be configured such that either the first groove portion 541 or the second groove portion 542 is not provided. By adopting such a configuration, the clutch can be engaged with the output member only when the input member rotates in one direction of rotation. Therefore, the output member can be rotated only when the input member rotates in one direction.

  In the description of the reverse input cutoff clutch according to the present invention so far, the form in which the viscous fluid is used as the resistance member has been described. However, the present invention is not limited to the form. In the present invention, the resistance member may be any member that can add resistance to the rotation of the clutch and delay the rotation of the clutch with respect to the rotation of the input member. As another example of the resistance member, a member that adds sliding resistance can be given. Other specific examples of the resistance member include rubber, metal, resin, fiber reinforced resin, and the like disposed so as to be in contact with the outer peripheral surface of the rotor. When a member that applies sliding resistance to the rotor is used as the resistance member, a large resistance can be applied to the rotor from the beginning of the rotation of the rotor. Therefore, since the rotation of the clutch interlocked with the rotor can be delayed from the rotation of the input member from the beginning when the input member starts rotating, the relative position between the input member and the clutch is shifted from the beginning when the input member starts rotating. Thus, the clutch and the output member are engaged. Therefore, by using a member that applies sliding resistance to the rotor as the resistance member, torque can be transmitted to the output member from the beginning when the input member starts to rotate.

  Further, in the description of the reverse input cutoff clutch according to the present invention so far, the mode in which the resistance member indirectly adds resistance to the rotation of the clutch by adding resistance to the rotation of the rotor has been described. It is not limited to. In the present invention, the resistance member may be a member that directly applies resistance to the clutch.

  In the above description of the reverse input cutoff clutch according to the present invention, the mode in which the clutch and the output member are automatically separated after the rotation of the input member is stopped by using the torsion spring 60 has been described. The invention is not limited to such forms. Instead of the torsion spring 60, another elastic body such as a leaf spring can be used similarly to the torsion spring 60. In addition, the relative position between the input member and the clutch is set to the first relative position by rotating the input member manually in the direction opposite to the direction in which the input member was manually rotated after the input member stopped rotating without using the elastic body. The clutch and the output member may be separated from each other by returning to the position.

  Further, in the description of the reverse input cutoff clutch according to the present invention so far, the description has been given of the form in which the input member, the clutch, and the output member are arranged in this order along the rotation axis, but the present invention is not limited to such form. You may arrange | position in order of an input member, an output member, and a clutch along a rotating shaft. That is, the second clutch portion may be formed on the inner surface of the bottom surface portion of the clutch, and the first clutch portion of the output member and the second clutch portion of the clutch may face each other inside the clutch. In this case, the shape of the guide groove may be a target shape with respect to a plane perpendicular to the rotation axis, compared to the shapes described so far.

  The reverse input cutoff clutch of the present invention has a function of transmitting torque applied from the input side to the output side and not transmitting torque applied from the output side to the input side. Therefore, the reverse input cut-off clutch of the present invention can be used for various household and business devices that require such a function.

DESCRIPTION OF SYMBOLS 1 ... Reverse input interruption | blocking clutch 10 ... Housing 20 ... Rotor 30 ... 1st seal member 35 ... 2nd seal member 40 ... Output member 50 ... Clutch 54 ... Guide Groove
54a ... Center part (center part of guide groove)
54b ... end (one end of the guide groove)
54c ... end (the other end of the guide groove)
60 ... Torsion spring 70 ... Input member 74 ... Guide part (convex part)
80 ... Rotor cap 90 ... Housing cap

Claims (9)

An input member that rotates about a rotation axis; an output member that rotates about the rotation axis; a clutch that rotates with the input member about the rotation axis; and a resistance member that applies resistance to rotation of the clutch; With
When the input member and the clutch are in the first relative position, the clutch and the output member are separated from each other,
When the input member and the clutch are in a second relative position where the relative position is different from the first relative position in the rotational direction and the rotational axis direction, the clutch and the output member are engaged,
The input member and the clutch move from the first relative position to the second relative position when the clutch receives resistance from the resistance member and the rotation of the clutch is delayed with respect to the rotation of the input member. A reverse input cut-off clutch. When the input member and the clutch are in the first relative position, the input member and the clutch move to the second relative position regardless of which direction the input member moves in the rotational direction. The reverse input cut-off clutch according to claim 1. One of the input member and the clutch has a protrusion and the other has a groove that engages with the protrusion,
The groove has a pair of grooves with end portions connected,
Each of the pair of grooves extends obliquely with respect to the rotation direction,
When the convex portion moves in one of the groove portions in the one rotational direction, the convex portion moves to one side along the rotational axis,
When the convex portion moves in the other groove direction in the other rotation direction, the convex portion moves to the one side along the rotation axis,
The input member and the clutch are in the first relative position when the convex portion is in the connecting portion of the pair of grooves,
3. The input member and the clutch are located at the second relative position when the convex portion is located at an end opposite to the connection portion of each of the pair of groove portions. Reverse input cutoff clutch. The input member and the clutch move to the second relative position only when the input member moves in one rotational direction when the input member and the clutch are in the first relative position. The reverse input cutoff clutch according to claim 1, wherein One of the input member and the clutch has a protrusion and the other has a groove that engages with the protrusion,
The groove extends obliquely with respect to the rotational direction;
The input member and the clutch are in the first relative position when the convex portion is at one end of the groove;
5. The reverse input cutoff clutch according to claim 4, wherein the input member and the clutch are in the second relative position when the convex portion is at the other end of the groove. The reverse input cutoff clutch according to any one of claims 1 to 5, further comprising a rotor that rotates in conjunction with the clutch, wherein the resistance member adds resistance to rotation of the rotor. A housing for accommodating the rotor;
The reverse input cutoff clutch according to claim 6, wherein a viscous fluid is filled as the resistance member between an outer peripheral surface of the rotor and an inner peripheral surface of the housing. 8. The elastic member according to claim 7, further comprising an elastic body that urges the input member and the clutch toward opposite sides in the rotational direction when the input member and the clutch are in the second relative position. The reverse input cutoff clutch as described. The reverse input cutoff clutch according to claim 1, wherein the resistance member is a member that applies sliding resistance.

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