JP6196331B2 - Free type two-way clutch using coil spring - Google Patents

Description

  The present invention is a clutch device that changes the power transmission state between the input shaft and the output shaft, in particular, the power of normal / reverse rotation from the input shaft is transmitted to the output shaft, and the power transmission from the output shaft is: The present invention relates to a free type bidirectional clutch that shuts off an output shaft by idling.

  In a power transmission system that drives a mechanical device or work equipment from a drive source such as a motor, various transmission devices are used to correspond to the characteristics of the driven device. Among such transmission devices, what is called a bi-directional clutch is a power transmission from the input shaft (drive side) to the output shaft (driven side). Both forward rotation and reverse rotation of the input shaft are used as output shafts. It has a function of transmitting and blocking power transmission from the output shaft to the input shaft in the opposite direction. The bidirectional clutch includes a clutch that idles the output shaft when power transmission from the output shaft is interrupted, and is called a free type bidirectional clutch.

  As an example, the free type bidirectional clutch can be applied to an opening / closing drive device that can manually operate an electric curtain, an electric sliding door, or the like. In this case, the free type bidirectional clutch is interposed between the drive motor and the curtain winding mechanism, and the drive motor is connected to the input shaft and the winding mechanism is connected to the output shaft. When the drive motor is rotated forward / reversely, the curtain can be raised and lowered, and at the stop position of the drive motor, a manual hoisting mechanism can be operated. There is no adverse effect. Such a function can be achieved even when an electromagnetic clutch is used, but electric power is required to operate the electromagnetic clutch, and a complicated control device for power control is also required. As a free type bidirectional clutch, for example, the bidirectional clutch described in Patent Document 1 related to the inventor of the present applicant is known, and this is based on the free engagement of the roller and the release thereof. This implements the bidirectional clutch function.

  By the way, an apparatus for interrupting power transmission using a coil spring is also known. For example, a known torque limiter provided with a coil spring causes the shaft to idle and interrupts transmission of power when a torque greater than the frictional force of the coil spring wound around the shaft is applied. Moreover, as a clutch device using a coil spring, for example, a device described in Patent Document 2 related to the idea of the present applicant is known, and this will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram showing the overall structure of the clutch device, and FIG. 6 is a diagram showing a cross section thereof.

The clutch device of FIG. 5 includes a first housing 1H, a second housing 2H, an inner ring N, and a coil spring S. The first housing 1H and the second housing 2H are respectively formed with a first locking piece 1HS and a second locking piece 2HS each having an arcuate cross section extending in the axial direction, and the first locking piece 1HS and the second locking piece. 2HS is installed in combination so that there are two gaps SP in the circumferential direction. The inner ring N is a cylindrical member that is rotatably fitted to the second housing 2H, and a coil spring S is in contact with the outer peripheral surface thereof.
At both ends in the axial direction of the coil spring S, hook portions F bent outward are formed at different positions in the circumferential direction, and the hook portions F are inserted into the two gaps, respectively. In this clutch device, when the rotation restriction of the second housing 2H is switched, the first housing 1H functions as an input shaft and the inner ring N functions as an output shaft, and functions as a free type bidirectional clutch.

When the first housing 1H (input shaft) rotates, the first locking piece 1HS contacts one of the two hook portions F of the coil spring S (the hook portion in front of the rotation direction) according to the rotation direction. The force that touches and pushes the hook portion F acts in the direction of tightening the spring (the direction in which the frictional force between the coil spring S and the inner ring N increases). At this time, by allowing the second housing 2H to freely rotate, the first locking piece 1HS rotates integrally with the coil spring S, the inner ring N, and the second locking piece 2HS. That is, the rotation of the first housing 1H that is the input shaft is transmitted to the inner ring N that is the output shaft.
On the other hand, when the inner ring N (output shaft) rotates while the second housing 2H is fixed, the movement in the circumferential direction is second locked by one of the hook portions F of the coil spring S according to the rotation direction. It is regulated by the piece 2HS. The hook portion F is equivalent to being pushed in the spring loosening direction by the second locking piece 2HS, the tightening force of the coil spring S with respect to the inner ring N is weakened, and the inner ring N rotates idly with respect to the coil spring S. That is, the rotation of the inner ring N that is the output shaft is blocked without being transmitted to the first housing 1H that is the input shaft.

Japanese Patent No. 4949196 Japanese Patent No. 4270338

  In the free type bidirectional clutch of Patent Document 1, an intermediate member that is spread by rotation of an input shaft abuts against an output shaft via a roller, and transmits power between the input shaft and the output shaft. Since the output shaft does not rotate until it is spread out, there is a so-called dead zone between the input shaft and the output shaft, and noise is generated with the contact of the members.

The clutch device of Patent Document 2, that is, the clutch device using the coil spring shown in FIG. 5, has the advantages that it does not require a roller or an intermediate member, is easy to assemble, and can be manufactured at low cost. The power transmission can be controlled with a simple structure, but when configured as a free-type two-way clutch, the second locking piece prevents the rotation from the output shaft side from being transmitted to the input shaft side. It is necessary to fix 2HS by a separate means. In other words, it is necessary to add a device for switching between rotation restriction and non-restriction of the second housing 2H. From this aspect, the device becomes larger and the structure becomes complicated.
Further, in the clutch device of FIG. 5, although the first housing and the second housing exist outside the inner ring and the coil spring, foreign matters such as dust and dirt are removed from the gap provided in the circumferential direction. By entering the inside of the two housings and adhering between the members, the failure frequency of the entire device increases, and the service life may be shortened.
An object of the present invention is a simple structure using a coil spring, in which bi-directional rotation of an input shaft is transmitted to an output shaft, and transmission of rotation from the output shaft is interrupted by the idle rotation of the output shaft. Is to solve the above-mentioned problems.

In view of the above problems, the present invention provides a free-type bidirectional clutch similar to the clutch device of FIG. 5 in which a coil spring is mounted on the outer peripheral surface of the output shaft, and an outer peripheral surface provided with an actuator corresponding to the second housing. The second coil spring is attached to the actuator, and the frictional force between the second coil spring and the actuator is adjusted to automatically switch the rotation of the actuator according to the direction of rotation transmission. It is what I did. That is, the present invention
“A non-rotatable housing having an inner space with a circular cross-section, and an input shaft and an output shaft that can rotate around a common rotating shaft in the inner space of the housing, and in the forward and reverse directions from the input shaft The rotation is transmitted to the output shaft, and the transmission of the rotation from the output shaft to the input shaft is a free type bidirectional clutch in which the output shaft is idled and cut off.
A first coil spring formed by winding a wire is attached to the outer peripheral surface of the output shaft, and an actuator that can rotate around a common rotating shaft is fitted,
Wherein the input shaft and the operating element, arc-shaped cross section of the input shaft locking piece and the actuating child latching pieces extending in the axial direction are respectively formed, said input shaft locking piece and the actuating child locking pieces, respectively with the outer peripheral surface of the slides on the inner circumferential surface of the inner space of the housing, circumferentially disposed two by the Hare set seen intertwined with gap exists, and, formed on both ends of the first coil spring Hook portions inserted into the two gaps,
A second coil spring formed by winding a wire is attached to the outer peripheral surface of the actuator, and hook portions formed at both ends of the second coil spring are provided in the housing. Inserted into two slits,
When the input shaft rotates, torque in the tightening direction acts on the first coil spring, torque in the loosening direction acts on the second coil spring, and the output shaft rotates with the actuator. Rotate together,
When the output shaft rotates, with the second coil spring stopped by the actuator, a torque in the loosening direction acts on the first coil spring, causing the output shaft to idle.
It is a free type bidirectional clutch characterized by this.

In the present invention, together with the entering-output shaft has an input shaft plate member is fixed to said input shaft locking piece has an end face which the output shaft is perpendicular to the rotation axis, and the input shaft plate member of said output shaft It is preferable that the end face is in surface contact.

In the free type bidirectional clutch of the present invention, the first coil spring formed by winding a wire rod is mounted on the outer peripheral surface of the output shaft, and can be rotated around a common rotating shaft with the input / output shaft The input actuator and the actuator are respectively formed with an input shaft locking piece and an actuator locking piece having a cross-sectional arc shape extending in the axial direction. The input shaft locking piece and the actuator locking piece are installed in combination so that there are two gaps in the circumferential direction, and hook portions formed at both ends of the first coil spring are provided in the gap. Each is inserted.
These points are the same as the clutch device of FIG. 5 and the actuator corresponds to the “second housing” of the clutch device. However, in the free type bidirectional clutch of the present invention, a wire is wound around the outer peripheral surface of the actuator. The second coil spring formed by turning is mounted, and the hook portions formed at both ends of the second coil spring are inserted into two slits provided in a fixed housing that accommodates the input / output shaft and the like. Insert each one.

The first coil spring wound around the output shaft has a force in the tightening direction when the input shaft locking piece abuts against the hook and pushes it, and conversely, the rotation of the output shaft locks the actuator. When the piece comes into contact with the hook and pushes it, it is mounted so that a force acts in the loosening direction. The second coil spring wound around the operating element is mounted so that a force in the loosening direction acts when the operating element locking piece is pressed and rotational torque is applied to the operating element.
Here, the first coil spring and the second coil spring have a slip torque T1s of the first coil spring (a torque that can be transmitted by a frictional force when a force in the loosening direction is applied to the spring, in other words, slip is not generated. The limit torque that is generated and cannot be transmitted) is set to be smaller than the slip torque T2s of the second coil spring. The lock torque of the first coil spring (the torque that can be transmitted when a force in the tightening direction acts on the spring) T1l is much larger than the slip torque T2s of the second coil spring. There is the following relationship.
T1l>T2s> T1s

In the free type bidirectional clutch of the present invention having such a structure, as shown in FIG. 2 described later, when the input shaft rotates, the input shaft locking piece applies torque in the tightening direction to the first coil spring. At the same time, a torque in the loosening direction is applied to the second coil spring via the actuator locking piece. Since the relationship of T1l> T2s is established, the inner peripheral surface of the first coil spring is locked with respect to the outer peripheral surface of the output shaft, but the inner peripheral surface of the second coil spring is on the outer peripheral surface of the actuator. Therefore, the input shaft and the output shaft rotate together while the actuator slides with respect to the second coil spring.
On the other hand, when the output shaft rotates, the first coil spring mounted on the output shaft also tries to rotate together with the output shaft, and a torque in the loosening direction is applied to the first coil spring. However, since T2s> T1s, the actuator is fixed to the housing by the second coil spring, and the inner peripheral surface of the first coil spring slides with respect to the outer peripheral surface of the output shaft. The output shaft runs idle with the child stopped.

Thus, in the free type bidirectional clutch of the present invention, the rotational power from the input shaft to the output shaft can be reliably transmitted with a simple structure using a coil spring, and the power transmission from the output shaft is not The output shaft can be shut off by idling. At that time, since restraint / non-constraint of rotation of the actuator is automatically switched, for example, it is not necessary to separately provide a brake device to fix the actuator, and the entire device can be made compact.
Further, by providing the fixed housing, main members including the input / output shaft can be installed in the housing. As a result, foreign matter such as dust and dirt can be prevented from entering the inside of the bidirectional clutch, and the durability of each accommodated member can be improved. It can be prevented from increasing.

  An internal space having a circular cross section is provided in the housing, and the inner peripheral surface of the internal space can be configured such that the outer peripheral surfaces of the input shaft locking piece and the actuator locking piece having an arcuate cross section slide. . Thus, the input shaft locking piece and the actuator locking piece rotate while being supported by the inner peripheral surface of the internal space of the housing. That is, the deformation of the input shaft locking piece and the actuator locking piece is prevented and the rigidity is substantially increased, and the transmission torque from the input shaft to the output shaft can be increased.

It is a figure which shows the Example of the free type bidirectional clutch of this invention. It is a figure explaining the action | operation of the bidirectional | two-way clutch of FIG. FIG. 2 is an exploded view of a single product showing an input / output shaft and the like of the bidirectional clutch of FIG. FIG. 2 is an exploded view of a single item showing a housing and the like of the bidirectional clutch of FIG. 1. It is a figure which shows an example of the conventional clutch apparatus using a coil spring. It is a figure explaining the action | operation of the clutch apparatus of FIG.

  The free type bidirectional clutch of the present invention will be described below with reference to the drawings. First, the overall structure of the bidirectional clutch of the present invention is shown in FIG. 1, and an explanatory diagram of its operation is shown in FIG. 3 and 4 show the components of the bidirectional clutch of the embodiment of FIG. 1 alone.

  As shown in the central longitudinal sectional view of FIG. 1 (see also FIGS. 3 and 4 where each part is shown as a single item), the bidirectional clutch of this embodiment has a common rotating shaft o in a fixed housing 1. The input shaft 2 and the output shaft 3 that can rotate as a center are arranged, respectively, and although not shown, the input shaft 2 is connected to a driving side such as a motor, and the output shaft 3 is connected to a driven side such as a lifting device. Connected.

  Referring to FIG. 4A together with FIG. 1, the housing 1 is a cup-shaped component including an end plate portion 11 having a regular hexagonal cross section and a peripheral wall portion 12 extending from the end plate portion 11 to one side in the axial direction. . The end plate portion 11 is formed with a through opening 11H that supports the input shaft 2. A lid 12C shown in FIG. 4B, which forms a part of the housing 1, is press-fitted into the opening end of the peripheral wall 12, and a through-opening 12CH that supports the output shaft 3 is inserted into the lid 12C. Is formed. The housing 1 is provided with an inner space 13 having a circular cross section inside the peripheral wall portion 12, and two slits 14 having a substantially fan-shaped cross section extending in the axial direction are formed at predetermined angular positions on the inner peripheral surface of the housing 1 in the circumferential direction. Is formed.

  As shown in FIG. 3A, the input shaft 2 is a component in which an input shaft plate member 21, an input shaft locking piece 22, and an input shaft portion 23 are integrally formed. The input shaft plate member 21 has a disc shape, and an opening 21H is formed at the center thereof. The input shaft locking piece 22 is a member having an arcuate cross section extending in the axial direction, and is fixed to a part of the peripheral edge portion of the input shaft plate member 21. In the illustrated embodiment, the input shaft locking piece 22 has an angle of 180 degrees in the circumferential direction. It exists over a small angular area. The input shaft portion 23 is a substantially cylindrical member that surrounds the opening 21H of the input shaft plate member 21 and extends to the opposite side of the input shaft locking piece 22 in the axial direction. A notch-like engagement portion 24 connected to a drive source such as a motor (not shown) is formed at the tip of the input shaft portion 23.

As shown in FIG. 3B, the output shaft 3 is a substantially cylindrical member, and has an end surface orthogonal to the rotation axis o . A reduced-diameter portion 31 is formed on the outer peripheral surface of one axial end portion of the output shaft 3, and a notch-like engaging portion 32 connected to a lifting device (not shown) is formed at the distal end portion. . A first coil spring 4 formed by winding a wire is attached to the outer peripheral surface of the output shaft 3, and an actuator 5 that can rotate about a common rotation shaft o is fitted.

  On both ends in the axial direction of the first coil spring 4, hook portions 41 bent outward are formed at different positions in the circumferential direction (see FIG. 3C). In the illustrated embodiment, the hook portions 41 extend in the normal direction with respect to the spring winding direction (i.e., the circumferential direction), and have an angular interval of 180 degrees from each other.

  As shown in FIG. 3D, the operating element 5 is a component in which an operating element plate member 51, an operating element locking piece 52, and an operating element shaft portion 53 are integrally formed. The actuator plate member 51 has a disc shape, and an opening 51H is formed at the center thereof. The actuator latching piece 52 is a member having an arcuate cross section extending in the axial direction, and is fixed to a part of the peripheral edge of the actuator plate member 51. In the illustrated embodiment, the actuator latching piece 52 is a circumferential member. It exists over an angular region somewhat smaller than 180 degrees in the direction and slightly larger than the input shaft locking piece 22 of the input shaft 2. The actuator shaft portion 53 is a cylindrical member that surrounds the opening 51 </ b> H of the actuator plate member 51 and extends to the opposite side of the actuator locking piece 52 in the axial direction. A second coil spring 6 formed by winding a wire is attached to the outer peripheral surface of the actuator shaft portion 53.

  At both ends in the axial direction of the second coil spring 6, hook portions 61 bent outward are formed at different positions in the circumferential direction (see FIG. 3E). In the illustrated embodiment, the hook portions 61 extend in the normal direction with respect to the spring winding direction (i.e., the circumferential direction), and have an angular interval of 180 degrees.

  In the present embodiment, the first coil spring 4 and the second coil spring 6 have a slip torque T1s with respect to the output shaft 3 of the first coil spring 4 and a slip torque with respect to the actuator 5 of the second coil spring 6. It is set to be smaller than T2s. This can be adjusted by increasing / decreasing the inner diameter and the number of turns of the first coil spring 4 and the second coil spring 6, as well as adjusting the spring constant by changing the material of the coil, and the output shaft. Further, it is possible to adjust by an appropriate method such as adjusting the coefficient of friction by changing the material of the actuator. The lock torque T1l of the first coil spring 4 is much larger than the slip torque T2s of the second coil spring 6.

The bidirectional clutch of the present embodiment shown in FIG. 1 is in the following state when the components are assembled in the housing 1.
The input shaft 2 and the actuator 5 are provided with the first coil spring 4 mounted on the input shaft locking piece 22 and the actuator locking piece 52 extending in the axial direction, as shown in the sectional view AA in FIG. The output shaft 3 is combined so as to face each other. As a result, two gaps 7 exist in the circumferential direction between the input shaft locking piece 22 and the actuator locking piece 52, and both ends of the first coil spring 4 are located in these gaps 7. The hook portions 41 formed in the above are respectively inserted. Here, the actuator locking piece 52 exists in a circumferential direction over a larger angle region than the input shaft locking piece 22, and when the hook portion 41 is inserted into the gap 7, the input shaft locking piece 22. The circumferential distance between the hook portion 41 and the hook portion 41 (the circumferential play in which the input shaft locking piece 22 can move between the two fixed hook portions 41: G in FIG. 1) It becomes larger than the distance in the circumferential direction between the piece 52 and the hook portion 41 (the circumferential play of the actuator locking piece 52: substantially zero in the case of FIG. 1).

  When the input shaft 2, the output shaft 3, and the actuator 5 are inserted into the housing 1, the input shaft plate member 21 and the other end surface of the output shaft 3 come into surface contact with each other and operate with the outer peripheral surface of the input shaft locking piece 22. Both the outer peripheral surfaces of the child locking pieces 52 are in contact with the inner peripheral surface of the inner space 13 of the housing 1 and slide on the inner peripheral surface during rotation. The hook portions 61 formed at both ends of the second coil spring 6 are respectively inserted into the two slits 14 provided in the housing 1, and the actuator locking piece 52 is either forward or reverse as will be described later. Even when it is pushed in this direction, the force is applied in the loosening direction so that it is positioned in the slit 14.

Next, the operation of the bidirectional clutch shown in FIG. 1 will be described with reference to FIG.
As indicated by the arrow on the right side of the longitudinal sectional view shown in FIG. 2A, the input shaft 2 is rotated clockwise (as viewed from the left in the axial direction) around the rotation axis o by, for example, a drive source motor. When rotating, the input shaft locking piece 22 formed on the input shaft 2 also rotates around the rotation shaft o in the same direction. The input shaft locking piece 22 rotated in the clockwise direction contacts the hook portion 41 (the hook portion 41 shown on the left side of the cross-sectional arrow AA) at the axial end portion on one side of the first coil spring 4. Then, the hook portion 41 is pushed in the spring tightening direction, and a torque in the tightening direction is applied to the first coil spring 4.
Further, the input shaft locking piece 22 pushes the operating element locking piece 52 via the hook portion 41, whereby the rotational torque rotating in the same direction is transmitted to the operating element 5. Due to this rotational torque, the hook portion 61 (the hook portion 61 shown below the cross-sectional arrow BB) at the other axial end of the second coil spring 6 is moved within the slit 14 of the housing 1. By abutting against the wall surface, the spring is relatively pushed in the loosening direction, and the tightening force of the second coil spring 6 against the actuator 5 is weakened. That is, rotational torque in the loosening direction acts on the second coil spring 6.

  At this time, since the lock torque T1l of the first coil spring 4 is larger than the slip torque T2s of the second coil spring 6, the inner peripheral surface of the first coil spring 4 is in relation to the outer peripheral surface of the output shaft 3. It locks without slipping, and the inner peripheral surface of the second coil spring 6 slides with respect to the outer peripheral surface of the actuator shaft portion 53. Therefore, the first coil spring 4 and the output shaft 3 rotate together with the input shaft 2 and the actuator 5 when the operator 5 slides with respect to the second coil spring 6. That is, the rotation from the input shaft 2 is transmitted to the output shaft 3.

  When the input shaft 2 rotates counterclockwise, the input shaft locking piece 22 is shown on the right side of the cross-sectional arrow A-A at the axial end of the other side of the first coil spring 4. It abuts against the hook part 41) and pushes it counterclockwise. The direction of the force is also the direction in which the tightening force of the first coil spring 4 against the output shaft 3 is increased. As in the case described above, the input shaft locking piece 22 causes the actuator locking piece 52 to The coil spring 4 is rotated in the counterclockwise direction. Thus, in the free type bidirectional clutch of the present invention, when the input shaft 2 rotates in the forward / reverse direction, the output shaft 3 rotates at the same speed in the same direction, and power is transmitted.

  In this embodiment, the outer peripheral surface of the input shaft locking piece 32 and the outer peripheral surface of the actuator locking piece 52 are both in contact with the inner peripheral surface of the inner space 13 of the housing 1 and slide on the inner peripheral surface during rotation. To do. Therefore, both the locking pieces are supported by the inner peripheral surface of the housing 1, the deformation thereof is prevented, and the transmission torque from the input shaft 2 to the output shaft 3 can be increased. In addition, since the input shaft plate member 21 and the output shaft 3 are in surface contact with each other, a runout or the like during rotation is prevented, and stable power transmission can be performed.

  On the other hand, as shown by the arrow in the longitudinal sectional view of FIG. 2B, when the output shaft 3 rotates around the rotation axis o in the clockwise direction (as viewed from the left in the axial direction), the output shaft 3 The first coil spring 4 attached to the first coil spring 4 also rotates in the same direction, and the hook portion 41 (the hook shown on the left side of the cross-sectional arrow A-A) at the axial end of one side of the first coil spring 4 is rotated. The part 41) abuts against the actuator locking piece 52 of the actuator 5 and pushes it. A reaction force from the actuator locking piece 52 acts on the hook portion 41, and a torque in the loosening direction acts on the first coil spring 4.

At this time, when the operating piece locking piece 52 is pushed by the hook portion 41, the rotational torque to rotate in the same direction is transmitted to the operating portion 5, and the axial end portion on the other side of the second coil spring 6 is transmitted. The hook portion 61 (the hook portion 61 shown on the lower side of the cross-sectional arrow BB) is pressed against the wall surface in the slit 14 of the housing 1 to be pushed in the spring loosening direction. A rotational torque in the loosening direction acts on the coil spring 6.
However, the slip torque T1s at which the first coil spring 4 slides on the outer peripheral surface of the output shaft 3 is set smaller than the slip torque T2s at which the second coil spring 6 slides on the outer peripheral surface of the actuator shaft portion 53. Then, the inner peripheral surface of the first coil spring 4 slides with respect to the outer peripheral surface of the output shaft 3 (as described above, there is a circumferential distance G between the input shaft locking piece 22 and the hook portion 41). Therefore, the first coil spring 4 can be bent by the action of the torque in the loosening direction, and the first coil spring 4 slides when the slip torque T1s is reached), and the inner peripheral surface of the second coil spring 6 is It remains locked without slipping with respect to the outer peripheral surface of the actuator shaft portion 53. That is, the output shaft 3 idles in a state where the actuator 5 is fixed to the housing 1 by the second coil spring 6 and stopped. That is, the transmission of rotation from the output shaft 3 to the input shaft 2 is interrupted by the idling of the output shaft 3.
The same is true when the output shaft 3 rotates counterclockwise around the rotation axis o. As a result, in the free type bidirectional clutch of this embodiment, the power of forward / reverse rotation from the input shaft is transmitted to the output shaft. Thus, the function of interrupting transmission of power from the output shaft by idling the output shaft is realized.

  As described in detail above, the present invention is such that when the second coil spring is mounted on the actuator and the input shaft rotates, torque in the tightening direction acts on the first coil spring, and the second coil When the torque is applied to the spring in the loosening direction, the output shaft rotates integrally with the actuator, and the output shaft rotates, the actuator is stopped by the second coil spring. A simple free-type two-way clutch in which the output shaft idles due to the loosening torque acting on the spring is configured. In the above embodiment, the notch-shaped engaging portion for connecting to the drive source and the driven device is formed on the input shaft and the output shaft. However, instead of this, a gear may be formed. Good. Further, it is apparent that various modifications can be made to the above-described embodiment, such as interposing bearings between the input shaft and the output shaft and the inner peripheral surface of the housing.

DESCRIPTION OF SYMBOLS 1 Housing 14 Slit 2 Input shaft 22 Input shaft latching piece 3 Output shaft 4 First coil spring 41 Hook part 5 Actuator 52 Actuator latching piece 6 Coil spring 61 Hook part 7 Gap

Claims (2)

A non-rotatable housing having an inner space with a circular cross-section, and an input shaft and an output shaft that are rotatable around a common rotating shaft in the inner space of the housing, and rotating in the forward and reverse directions from the input shaft Is transmitted to the output shaft, and transmission of rotation from the output shaft to the input shaft is a free type bidirectional clutch in which the output shaft is idled and cut off,
A first coil spring formed by winding a wire is attached to the outer peripheral surface of the output shaft, and an actuator that can rotate around a common rotating shaft is fitted,
Wherein the input shaft and the operating element, arc-shaped cross section of the input shaft locking piece and the actuating child latching pieces extending in the axial direction are respectively formed, said input shaft locking piece and the actuating child locking pieces, respectively with the outer peripheral surface of the slides on the inner circumferential surface of the inner space of the housing, circumferentially disposed two by the Hare set seen intertwined with gap exists, and, formed on both ends of the first coil spring Hook portions inserted into the two gaps,
A second coil spring formed by winding a wire is attached to the outer peripheral surface of the actuator, and hook portions formed at both ends of the second coil spring are provided in the housing. Inserted into two slits,
When the input shaft rotates, torque in the tightening direction acts on the first coil spring, torque in the loosening direction acts on the second coil spring, and the output shaft rotates with the actuator. Rotate together,
When the output shaft rotates, with the second coil spring stopped by the actuator, a torque in the loosening direction acts on the first coil spring, causing the output shaft to idle. Free type two way clutch. The input shaft has an input shaft plate member to which the input shaft locking piece is fixed, the output shaft has an end surface orthogonal to the rotation shaft, and the input shaft plate member and the end surface of the output shaft are in surface contact. The free type bidirectional clutch according to claim 1 .