JP6674998B1 - Lock type two-way clutch using coil spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock type bidirectional clutch which is inexpensive in manufacturing cost and is compact. An input member 4 includes an input end plate and a cylindrical wall 16 extending from a peripheral edge of the input end plate, and the cylindrical wall 16 and a fixed flange 8 are axially engaged by engaging means 24 and 56. The input member 4 is rotatable with respect to the flange 8. [Selection diagram] Fig. 1

Description

  The present invention relates to a clutch device for changing a power transmission state between an input member and an output member, and particularly to transmitting forward / reverse rotation power from an input member (drive side) and from an output member (driven side). The present invention relates to a lock type two-way clutch using a coil spring, which shuts off an output member so as not to rotate.

  In a power transmission system that drives work equipment or the like from a drive source such as a motor, for example, an elevating device that moves articles up and down by a motor, when the article reaches a predetermined position, the motor is automatically stopped when the motor is stopped. In some cases, a position holding operation is required. Therefore, there is known a device that uses a lock-type bidirectional clutch having an input member and an output member to connect the input member to a forward / reversely rotatable motor, and raises and lowers an article by rotating the output member. .

  The lock-type bidirectional clutch is also applied to, for example, a lift device for transferring a sheet table on which a sheet is placed in a finisher of a copying machine, or a lift device for moving a window blind of a building up and down. By utilizing this, it becomes possible to automatically control the power transmission by a simple device, and it becomes unnecessary to use electric power or the like, for example, when a brake mechanism is provided and electrically controlled. Also, when an unexpected reverse input occurs from the output member side, the motor of the drive source can be protected.

  As a conventional lock type two-way clutch, for example, a clutch described in Patent Document 1 according to the inventor of the present applicant is known, and this will be described with reference to FIG. The clutch shown in FIG. 12 includes a fixed housing H provided with an internal space having a circular cross section, an input shaft I and an output shaft E installed inside the housing H and rotatable around a common rotation shaft, and a housing H. The inner ring N includes a cylindrical shaft-shaped inner ring N fixed thereto, and one coil spring S mounted on the outer peripheral surface of the inner ring N. The housing H includes an end plate P and a cylindrical wall C extending in the axial direction from a peripheral edge of the end plate P. An internal space is defined inside by inserting the shield plate S into a free end portion of the cylindrical wall C. ing. The input shaft I and the output shaft E are formed with an input locking piece IE and an output locking piece OE having an arcuate cross section extending in the axial direction, respectively. The input shaft I and the output shaft E face each other, and are combined such that the input locking piece IE and the output locking piece OE have two gaps in the circumferential direction. The coil spring S is formed by winding a wire, and hook portions F bent outward are formed at both ends in the axial direction at different positions in the circumferential direction. The inner peripheral surface of the coil spring S is in contact with the outer peripheral surface of the inner ring N. Each of the hook portions F is inserted into each of the two gaps defined by the input locking pieces IE and the output locking pieces OE.

When the input shaft I rotates, the input locking piece IE abuts on one of the two hook portions F of the coil spring S (the hook portion F located forward in the rotation direction) according to the direction of rotation, and pushes this. . At this time, the pushing force acts in the direction in which the spring is loosened (the direction in which the frictional force between the coil spring S and the inner ring N decreases). When the tightening force of the coil spring S on the inner ring N is loosened to a predetermined degree by the pressing force of the input locking piece IE, the input locking piece IE rotates somewhat with respect to the inner ring N together with the coil spring S, and the hook The portion F contacts the output locking piece OE. At this time, since the output shaft E is freely rotatable, as a result, the input locking piece IE rotates with respect to the housing H and the inner ring N integrally with the coil spring S and the output locking piece OE. . That is, the rotation of the input shaft I is transmitted to the output shaft E.
On the other hand, when the output shaft E attempts to rotate, the output locking piece OE is connected to one of the two hook portions F of the coil spring S (the hook portion F located forward in the rotation direction) according to the rotation direction. Touch this and press it. At this time, the pressing force acts in the spring tightening direction (the direction in which the frictional force between the coil spring S and the inner ring N increases), and the inner ring N on which the coil spring S is mounted is fixed to the housing H. Therefore, the output locking piece OE does not rotate. That is, the rotation of the output shaft E is not transmitted to the input shaft I and cut off.

Japanese Patent No. 5993512

  The lock type two-way clutch of Patent Document 1 has a small number of parts, is compact, and the manufacturing process is easy. However, it is not sufficient yet, and further reduction in manufacturing cost and downsizing are required.

  The present invention has been made in view of the above-mentioned facts, and a main technical problem thereof is to provide a new and improved lock type two-way clutch which is more inexpensive to manufacture and compact.

  The inventor of the present invention has conducted extensive studies, and as a result, the input member has an input end plate and a cylindrical wall extending from the peripheral edge of the input end plate, and the cylindrical wall and a fixed flange are axially engaged by engaging means, It has been found that the main technical problem is achieved by making the input member rotatable with respect to the flange.

That is, according to the first aspect of the present invention , as a lock-type two-way clutch that achieves the main technical problem, an input member and an output member that can rotate around a common rotation shaft are provided. The rotation in the forward and reverse directions is transmitted to the output member, and the transmission of rotation from the output member to the input member is a lock-type two-way clutch in which the output member cannot be rotated and is shut off. ,
A fixed flange that defines a closed accommodation space in combination with the input member, an axial inner ring fixed to the flange in the accommodation space, and a coil spring mounted on the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate. The cylindrical wall and the flange are axially engaged by engaging means, and the input member is attached to the flange. It is rotatable with respect to
The engaging means includes an annular engaged claw continuously extending in a circumferential direction at a distal end portion of the cylindrical wall, and a plurality of engaging claws arranged at intervals in the circumferential direction on the flange. Composed,
The coil spring is formed by winding a wire, and outwardly bent hook portions are formed at both ends in the axial direction at different positions in the circumferential direction, and the inner peripheral surface is in contact with the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hooks at both ends of the coil spring are inserted into each of the two gaps,
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in a spring loosening direction, rotates the output member together with the coil spring, and applies a rotational force to the output member. In the lock type two-way clutch, the output locking member pushes a hook portion of the coil spring in a direction of tightening the spring, so that the output member cannot be rotated.
In the first aspect of the present invention, a through hole is formed adjacent to the base end in a radially outer side and an inner side of the base end of the engagement claw, respectively. Is preferably made into a thin piece.

According to the second aspect of the present invention, an input member and an output member rotatable about a common rotation axis are provided, and forward and reverse rotations from the input member are transmitted to the output member, Transmission of rotation from the output member to the input member is a lock-type two-way clutch in which the output member is unrotatably interrupted,
A fixed flange that defines a closed accommodation space in combination with the input member, an axial inner ring fixed to the flange in the accommodation space, and a coil spring mounted on the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate. The cylindrical wall and the flange are axially engaged by engaging means, and the input member is attached to the flange. It is rotatable with respect to
The engaging means includes a plurality of engaged claws arranged at intervals in a circumferential direction at a distal end portion of the cylindrical wall, and an annular engaging claw extending continuously in the circumferential direction at the flange. Composed,
The coil spring is formed by winding a wire, and outwardly bent hook portions are formed at both ends in the axial direction at different positions in the circumferential direction, and the inner peripheral surface is in contact with the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hooks at both ends of the coil spring are inserted into each of the two gaps,
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in a spring loosening direction, rotates the output member together with the coil spring, and applies a rotational force to the output member. In the lock type two-way clutch, the output locking member pushes a hook portion of the coil spring in a direction of tightening the spring, so that the output member cannot be rotated.
In the first aspect and the second aspect of the present invention, the flange is provided with an annular groove into which a tip portion of the cylindrical wall is fitted, and the engaging claw is disposed along an outer peripheral edge of the groove. It is good to be. Good Mashiku, the input locking piece is fixed to the inner peripheral surface of the tubular wall. Preferably, both the input locking piece and the output locking piece are arc-shaped in cross section and are formed one by one.

  In the lock type two-way clutch of the present invention, the input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate, and the cylindrical wall and the flange are axially engaged by engagement means, The input member is rotatably combined with the flange. Therefore, in the lock-type two-way clutch of the present invention, the housing space conventionally defined by the housing and the shield plate can be defined by the input member and the fixed flange, and substantially. The shield plate can be omitted. Thus, in the lock type two-way clutch of the present invention, the manufacturing cost can be reduced by reducing the number of parts, and the axial direction can be made compact by the thickness of the omitted shield plate.

FIG. 1 shows a preferred embodiment of a lock-type two-way clutch configured according to the present invention. FIG. 2 is an exploded perspective view of the bidirectional clutch shown in FIG. 1. FIG. 2 is a single-part view of an input member of the bidirectional clutch shown in FIG. 1. FIG. 2 is a single item diagram of an output member of the bidirectional clutch shown in FIG. 1. FIG. 2 is a single item diagram of a flange of the bidirectional clutch shown in FIG. 1. FIG. 2 is a single-part view of an inner ring of the bidirectional clutch shown in FIG. 1. FIG. 2 is a single-piece view of a coil spring of the bidirectional clutch shown in FIG. 1. FIG. 4 is a diagram showing a first modification of the flange of the bidirectional clutch shown in FIG. 1. FIG. 7 is a view showing a second modification of the flange of the bidirectional clutch shown in FIG. 1. FIG. 2 is a diagram illustrating an operation when an input member is rotated in the bidirectional clutch shown in FIG. 1. FIG. 2 is a view for explaining an operation when the output member is to be rotated in the bidirectional clutch shown in FIG. 1. The figure which shows an example of the conventional lock type bidirectional clutch which used the coil spring.

  Hereinafter, preferred embodiments of a lock type two-way clutch configured according to the present invention will be described in further detail with reference to the accompanying drawings.

  Referring to FIGS. 1 and 2, a lock type bidirectional clutch, generally designated by the numeral 2, constructed in accordance with the present invention comprises an input member 4, an output member 6, a fixed flange 8, and an inner race 10 And a coil spring 12. In the cross-sectional view of FIG. 1, the input member 4 is hatched in the lower right direction, the output member 6 is hatched in the lower left direction, and the inner ring 10 is light black for easy understanding. (The same applies to FIGS. 10 and 11).

  Mainly referring to FIG. 3, the input member 4 is made of synthetic resin and has a disk-shaped input end plate 14 and a cylindrical wall 16 extending in the axial direction from the periphery of the input end plate 14. It is a cup-shaped member. At the center of the input end plate 14, a cylindrical wall 18 extending in the axial direction parallel to the cylindrical wall 16 is formed. A non-circular hole 20 penetrating in the axial direction is formed inside the base end of the cylindrical wall 18. The input member 4 is further formed with an input locking piece 22 extending in the axial direction. In the illustrated embodiment, the input locking piece 22 is fixed to the inner peripheral surface of the cylindrical wall 16. The input locking piece 22 has an arc-shaped cross section and extends in the circumferential direction over an angle range of 150 degrees, and both end surfaces in the circumferential direction linearly extend in the radial direction. The input locking piece 22 extends from the proximal end of the cylindrical wall 16 to the distal end thereof when viewed in the axial direction. An annular engaged claw 24 that protrudes radially outward and extends continuously in the circumferential direction is formed at a distal end portion of the outer peripheral surface of the cylindrical wall 16.

Explaining mainly with reference to FIG. 4, the output member 6 is made of synthetic resin, and has an annular output end plate 26. A hollow shaft member 27 extending from the inner peripheral edge toward one side in the axial direction is fixed to one side surface of the output end plate 26. The shaft member 27 includes a large-diameter cylindrical base end portion 28, a medium-diameter cylindrical intermediate portion 30, and a distal end portion 32 in which a part of the outer peripheral surface of the small-diameter cylindrical member is cut away. The base end portion 28, the middle portion 30, and the front end portion 32 are concentrically arranged in series in the axial direction, and are connected to each other at the connection portion between the base end portion 28 and the middle portion 30, and between the middle portion 30 and the front end portion 32. Each of the portions has an annular first shoulder surface 34 and a second shoulder surface 36 which are substantially perpendicular to the axial direction. An annular groove 40 surrounding the base of the shaft member 27 is also formed on one side surface of the output end plate 26. On the outer peripheral edge of the other side surface of the output end plate 26, an annular ridge 41 slightly projecting toward the other side in the axial direction is formed. The output member 6 is further formed with an output locking piece 42 extending in the axial direction. In the illustrated embodiment, the output locking piece 42 has an arc-shaped cross section, extends over an angular range of 170 degrees in the circumferential direction, and is fixed to the outer peripheral surface of the output end plate 26. The base end of the output locking piece 42 and the end face of the output end plate 26 (excluding the ridge 41) are aligned in the axial direction. Both end surfaces in the circumferential direction of the output locking piece 42 extend linearly in the radial direction except for the radially inner end, and the radially inner end has a shape of a base end of a hook portion described later of the coil spring 12. And a corresponding arc.

  Referring mainly to FIG. 5, the flange 8 is a disk-shaped member made of synthetic resin, and its outer diameter is larger than the outer diameter of the input end plate 14 (see also FIG. 1). A regular hexagonal locking opening 44 is formed in the center, and three mounting holes 46 are formed in the outer peripheral edge at equal angular intervals in the circumferential direction. A substantially circular recess 48 is formed at the center of one side surface. At an intermediate position in the radial direction of the recess 48, a cylindrical wall 50 is formed to extend somewhat in the axial direction surrounding the locking opening 44, and an annular groove is formed between the cylindrical wall 50 and the outer peripheral edge of the recess 48. 52 are provided. At the radially intermediate portion of the extended end surface of the cylindrical wall 50, a cylindrical projecting wall 54 that surrounds the locking opening 44 and projects slightly further in the axial direction is also formed. Here, a plurality of engaging claws 56 are formed on the flange 8 at intervals in the circumferential direction. In the illustrated embodiment, three engaging claws 56 are arranged at equal angular intervals along the outer peripheral edge of the groove 52, and all of them protrude radially inward. Through holes 60 are formed on the outside and inside in the radial direction of the proximal end portion 58 of the engaging claw 56, respectively, adjacent to the proximal end portion 58, and the proximal end portion 58 has a thin piece shape. The cross-sectional shapes of the through-hole portions 60 are substantially rectangular, and the portions adjacent to the both end portions thereof together with the base end portion 58 are also thin pieces.

  Referring mainly to FIG. 6, the inner ring 10 is a metal shaft member, and is a regular hexagonal plate-shaped locking protrusion 62, and the outer periphery of the locking protrusion 62 at the other axial end. An annular outer shoulder wall 64 extending radially outward from the peripheral edge and having a circular outer periphery, and a cylindrical wall 66 extending from the outer peripheral edge of the outer shoulder wall 64 to the other axial side are provided. A circular through hole is formed in the center of the locking projection 62 and communicates with the inside of the cylindrical wall 66. A first portion 68 having the largest inner diameter is provided at the other axial end inside the inner ring 10, and a second portion 70 having an inner diameter smaller than the first portion 68 is provided at an axially intermediate portion at one axial end. Is provided with a third portion 72 having an inner diameter smaller than that of the second portion 70, between the first portion 68 and the second portion 70, and between the second portion 70 and the third portion 72. An annular first inner shoulder wall surface 74 and a second inner shoulder wall surface 76 substantially perpendicular to the axial direction are formed therebetween. The inner race 10 is fixed to the flange 8 by fitting the locking projection 62 into the locking opening 44 of the flange 8 with the coil spring 12 mounted. As shown in FIG. 7, the coil spring 12 is formed by winding a wire, and hook portions 78 bent outward are formed at both ends in the axial direction at different positions in the circumferential direction. In the illustrated embodiment, when the coil spring 12 is in a natural state, that is, in the state shown in FIG. 7, the circumferential interval between the hook portions 78 is approximately 80 degrees. 1, the circumferential interval between the hook portions 78 becomes substantially 180 degrees as shown in the BB cross-sectional view of FIG.

Next, the combination of the above components will be described mainly with reference to FIG.
The output member 6 and the inner ring 10 fixed to the flange 8 are combined by fitting the shaft member 27 of the output member 6 inside the inner ring 10. At this time, the outer peripheral surface of the base end portion 28 of the shaft member 27 and the inner peripheral surface of the first portion 68 of the inner ring 10 correspond to the outer peripheral surface of the intermediate portion 30 of the shaft member 27 and the second portion 70 of the inner ring 10. The inner peripheral surface abuts against each other in the radial direction, and the first shoulder wall 34 of the shaft member 27 and the first inner shoulder wall surface 74 of the inner race 10 form the second shoulder wall of the shaft member 27. 36 and the second inner shoulder wall surface 76 of the inner ring 10 are combined in a state where they face each other in the axial direction and are in contact with each other (see also FIGS. 4 and 6).

  Next, the input member 4 and the flange 8 are combined. When the input member 4 and the flange 8 are combined, the input member 4 is pivoted with respect to the flange 8 with the engaged claw 24 of the input member 4 and the engaging claw 56 of the flange 8 aligned in the axial direction. Force in the direction. As a result, the engaged claw 24 elastically rides over the engaging claw 56 and is engaged therewith. At this time, in the illustrated embodiment, through holes 60 are formed adjacent to the base end 58 on the radially outside and inside of the base end 58 of the engagement claw 56, respectively. Is made into a thin piece. Therefore, the proximal end portion 58 has flexibility in the radial direction, and the engaged claw 24 easily gets over the engaging claw 56 and is thereby engaged. When the input member 4 and the flange 8 are combined, a closed accommodation space is defined inside the input member 4, and the inner ring 10 to which the coil spring 12 is mounted is arranged in this accommodation space. When the input member 4 and the flange 8 are combined with each other, the distal end of the cylindrical wall 16 is fitted into the annular groove 52, and the input member 4 is rotatable with respect to the flange 8. At this time, the input member 4 and the output member 6 are arranged such that the input locking piece 22 and the output locking piece 42 have two gaps 82 in the circumferential direction as shown in the BB cross-sectional view of FIG. The hooks 78 at both ends of the coil spring 12 are inserted into each of the two gaps 82. Further, the input end plate 14 and the ridge 41 formed on the output end plate 26 come into contact with each other, and the outer peripheral surface of the cylindrical wall 18 and the inner peripheral surface of the base end portion 28 face and abut in the radial direction, The extended end surface of the cylindrical wall 18 and the base end surface of the intermediate portion 30 are opposed to each other in the axial direction and abut against each other (see also FIGS. 3 and 4).

  In the lock-type two-way clutch of the present invention, the input member 4 has the input end plate 14 and the cylindrical wall 16 extending from the peripheral edge of the input end plate 14, and the cylindrical wall 16 and the flange 8 are engaged with the engaging means (covered). The engagement between the engagement claw 24 and the engagement claw 56) causes the input member 4 to be rotatably combined with the flange 8 in the axial direction. Therefore, in the lock-type two-way clutch of the present invention, the housing space conventionally defined by the housing and the shield plate can be defined by the input member 4 and the fixed flange 8, and substantially. It is possible to omit the shield plate in total. Thus, in the lock type two-way clutch of the present invention, the manufacturing cost can be reduced by reducing the number of parts, and the axial direction can be made compact by the thickness of the omitted shield plate.

  The lock type two-way clutch 2 combined as shown in FIG. 1 is fixed to a mounted member (not shown) by inserting a bolt through the mounting hole 46 of the flange 8. Here, the method of fixing the lock-type two-way clutch configured according to the present invention to the above-described mounted member is not limited to inserting a bolt into a mounting hole formed in the flange. For example, like a flange indicated by reference numeral 8a in FIG. 8, a spline 46a is provided on the outer periphery, a spline corresponding to the spline 46a is provided at a predetermined position of the mounted member, and the flange 8a and the mounted member are spline-fitted. It may be fixed if necessary. Further, as shown by a flange indicated by reference numeral 8b in FIG. 9, a plurality of recesses 46b are provided on the outer periphery at intervals in the circumferential direction, and a projection corresponding to the recess 46a is provided at a predetermined position of the mounted member. Alternatively, the flange 8b and the mounted member may be fixed by fitting the concave portion 46b and the convex portion.

Next, the operation of the bidirectional clutch shown in FIG. 1 will be described with reference to FIGS.
As shown by the arrow in the central longitudinal sectional view of FIG. 10, when the input member 4 rotates around the rotation axis o in a counterclockwise direction (as viewed from the left in the axial direction) by, for example, a motor of a driving source, The input locking piece 22 formed on the input member 4 also rotates around the rotation axis o in the same direction. The input locking piece 22 rotated around the rotation axis o is connected to one end of each of the coil springs 12 in the axial direction, that is, the hook portion 78 of the coil spring 12 located forward in the rotation direction (upward in the BB cross-sectional view). Hook portion 78) shown in the figure, and pushes hook portion 78 in the direction in which the spring is loosened to weaken the tightening force of coil spring 12 on inner ring 10. Further, the input locking pieces 22 push the output locking pieces 42 through the respective hook portions 78, and rotate the output locking pieces 42 together with the coil spring 12 while weakening the tightening force of the coil spring 12 on the inner ring 10. .

  When the input member 4 rotates clockwise, the input locking piece 22 is moved to the hook portion 78 (the hook portion 78 shown on the lower side in the BB cross-sectional view) at the other end in the axial direction of the coil spring 12. Touch it and press it clockwise. The direction of the force is also a direction in which the tightening force of the coil spring 12 with respect to the inner ring 10 is weakened. As in the above-described case, the input locking piece 22 causes the output locking piece 42 to move clockwise together with the coil spring 12. Rotate. Thus, in the lock type two-way clutch of the present invention, when the input member 4 rotates in the forward / reverse direction, the output member 6 rotates at the same speed in the same direction, and power transmission is performed. At this time, in the illustrated embodiment, the output member 6 and the inner race 10 are such that the outer peripheral surface of the base end portion 28 and the inner peripheral surface of the first portion 68 correspond to the outer peripheral surface of the intermediate portion 30 and the second portion. 70 and abut against each other in the radial direction, and the first shoulder wall 34 and the first inner shoulder wall surface 74 form the second shoulder wall 36 and the second inner shoulder wall surface 76. Are combined in a state where they face each other in the axial direction, so that the output member 6 is supported by the inner ring 10 in the radial direction and the thrust direction, and the rotation of the output member 6 is stabilized. Further, the input member 4 and the output member 6 are in surface contact with the input end plate 14 and the output end plate 26, and the outer peripheral surface of the cylindrical wall 18 and the inner peripheral surface of the base end portion 28 face each other in the radial direction. The input member 4 is brought into contact with the output member 6 in the radial direction and the thrust direction because the extended end surface of the cylindrical wall 18 and the base end surface of the intermediate portion 30 are opposed and abutted in the axial direction. The rotation of the input member 4 is also stabilized. Therefore, it is possible to prevent the input shaft 2 and the output shaft 3 from eccentricity and vibration during transmission of rotation.

  On the other hand, as shown by the arrow in the central longitudinal sectional view of FIG. 11, the output member 6 is rotated counterclockwise around the rotation axis o (as viewed from the right in the axial direction) by the rotation torque from the output member 6 side. , The output locking piece 42 pushes the hook portion 78 of the coil spring 12 (the hook portion 78 shown on the upper side in the BB sectional view) in the spring tightening direction, and the coil spring 12 In order to increase the tightening force, the output locking piece 42 does not rotate with respect to the inner ring 10. This point is the same when the output member 6 is to be rotated clockwise (when viewed from the right in the axial direction) (in this case, the output locking piece 42 is on the lower side of the BB cross-sectional view). Abuts on the hook portion 78). Therefore, transmission of rotation from the output member 6 to the input member 4 is interrupted because the output member 6 cannot rotate.

As described in detail above, the present invention fixes an inner ring on which a coil spring is mounted in a housing space defined by combining a fixed flange and an input member rotatable with respect to the fixed flange, and rotates the input shaft. Sometimes, the input locking piece pushes the hook portion of the coil spring in the spring loosening direction to rotate the output shaft together with the coil spring, while the output locking piece attempts to rotate the output shaft together with the coil spring. A simple lock-type two-way clutch which pushes the output shaft in a direction in which the spring is tightened to disable rotation is provided. In the above embodiment, the engaged claw formed on the input member is annular, and a plurality of engaging claws formed on the flange are provided at intervals in the circumferential direction. A plurality of the engaged claws may be provided at intervals in the circumferential direction, and the engaging claws may be annular. In the above-described embodiment, the input locking piece and the output locking piece are both arc-shaped members extending in the axial direction and are provided one by one. Each of the locking pieces may be constituted by a pair of rod-shaped members which are arranged at intervals in the circumferential direction and extend in the axial direction.

2: Lock type bidirectional clutch 4: Input member 6: Output member 8: Flange 10: Inner ring 12: Coil spring 14: Input end plate 16: Cylindrical wall 24: Engagement claw (engaging means)
26: output end plate 42: output locking piece 52: annular groove 56: engaging claw (engaging means)
58: Base end 60: Through hole 78: Hook

Claims (6)

An input member and an output member rotatable about a common rotation axis; forward and reverse rotations from the input member are transmitted to the output member; and rotation from the output member to the input member is provided. The transmission of the lock type two-way clutch is interrupted so that the output member can not be rotated,
A fixed flange that defines a closed accommodation space in combination with the input member, an axial inner ring fixed to the flange in the accommodation space, and a coil spring mounted on the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate. The cylindrical wall and the flange are axially engaged by engaging means, and the input member is attached to the flange. It is rotatable with respect to
The engaging means includes an annular engaged claw continuously extending in a circumferential direction at a distal end portion of the cylindrical wall, and a plurality of engaging claws arranged at intervals in the circumferential direction on the flange. Composed,
The coil spring is formed by winding a wire, hook portions bent outward at both ends in the axial direction are formed at different positions in the circumferential direction, and the inner peripheral surface is in contact with the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hook portions at both ends of the coil spring are inserted into each of the two gaps,
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in a spring loosening direction, rotates the output member together with the coil spring, and applies a rotational force to the output member. The lock type two-way clutch, wherein the output locking member pushes a hook portion of the coil spring in a spring tightening direction, so that the output member cannot be rotated. The through-hole part is formed in the radial outer side and the inner side of the base end part of the said engagement nail | claw, respectively, adjacent to the said base end part, The said base end part is made into the thin piece shape. 2. The lock-type two-way clutch according to 1. An input member and an output member rotatable about a common rotation axis; forward and reverse rotations from the input member are transmitted to the output member; and rotation from the output member to the input member is provided. The transmission of the lock type two-way clutch is interrupted so that the output member can not be rotated,
A fixed flange that defines a closed accommodation space in combination with the input member, an axial inner ring fixed to the flange in the accommodation space, and a coil spring mounted on the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate. The cylindrical wall and the flange are axially engaged by engaging means, and the input member is attached to the flange. It is rotatable with respect to
The engaging means includes a plurality of engaged claws arranged at intervals in a circumferential direction at a distal end portion of the cylindrical wall, and an annular engaging claw extending continuously in the circumferential direction at the flange. Composed,
The coil spring is formed by winding a wire, and outwardly bent hook portions are formed at both ends in the axial direction at different positions in the circumferential direction, and the inner peripheral surface is in contact with the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hooks at both ends of the coil spring are inserted into each of the two gaps,
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in a spring loosening direction, rotates the output member together with the coil spring, and applies a rotational force to the output member. The lock type two-way clutch, wherein the output locking member pushes a hook portion of the coil spring in a spring tightening direction, so that the output member cannot be rotated. The lock type according to any one of claims 1 to 3, wherein the flange is provided with an annular groove into which a tip portion of the cylindrical wall fits, and the engaging claw is arranged along an outer peripheral edge of the groove. Two-way clutch.   The lock type two-way clutch according to any one of claims 1 to 4, wherein the input locking piece is fixed to an inner peripheral surface of the cylindrical wall.   The lock-type two-way clutch according to any one of claims 1 to 5, wherein both the input locking piece and the output locking piece have an arc-shaped cross section and are formed one by one.