HK1218150B - Free-type bi-directional clutch - Google Patents

Description

Free type bidirectional clutch

Technical Field

The present invention relates to a clutch device that changes a power transmission state between an input shaft and an output shaft, and more particularly to a free type two-way clutch that transmits power in a forward/reverse direction from the input shaft to the output shaft, and cuts off the transmission by idling the output shaft with respect to the transmission of the power from the output shaft.

Background

In a power transmission system in which a machine, a working machine, or the like is driven by a drive source such as a motor, various transmission devices are used in accordance with characteristics of the driven machine. In this type of transmission device, a member called a bidirectional clutch has the following functions: in power transmission from an input shaft (driving side) to an output shaft (driven side), forward rotation and reverse rotation of the input shaft are transmitted to the output shaft together, and power transmission from the output shaft to the input shaft in the reverse direction is interrupted. Among the two-way clutches, there is a clutch that idles the output shaft when power transmission from the output shaft is cut off, and this clutch is called a free type two-way clutch.

As an example, the free type bidirectional clutch can be applied to an opening/closing drive device that can operate a motorized window curtain, a motorized sliding door, or the like even manually. In this case, the free type bidirectional clutch is interposed between the drive motor and the winding-up mechanism of the window curtain, the drive motor is connected to the input shaft, and the winding-up mechanism is connected to the output shaft. When the drive motor is rotated forward or backward, the window curtain can be raised or lowered, and the take-up mechanism can be manually operated at the stop position of the drive motor. Such a function can be achieved even with an electromagnetic clutch, but a complicated control device for electric power control is required to operate the electromagnetic clutch.

As a free type two-way clutch, for example, a two-way clutch described in patent document 1 (japanese patent No. 4949196) invented by the present applicant is known, and the description thereof will be made with reference to fig. 7A to 7C. Fig. 7A is a sectional view showing the entire structure of the free type bidirectional clutch, and fig. 7B and 7C are operation diagrams showing the operation.

As shown in fig. 7A, a cylindrical output member OM is rotatably disposed in a cylindrical housing HG with a gap therebetween, and is fixed to the output shaft. An input member IM having a long shaft portion and a short shaft portion formed by cutting out upper and lower portions of a circular cross section is fixed to the input shaft, and an intermediate member MM divided into two parts is disposed between the output member OM and the input member IM. The two intermediate members MM are provided with a tension spring TS therebetween so as to approach each other, and rollers RO inserted into wedge-shaped recesses are provided at the peripheral edge portions of the intermediate members MM so as to face the inner surface of the output member OM.

As the input shaft rotates, when the input member IM rotates clockwise as shown in fig. 7B, the input member IM formed with the long shaft portion and the short shaft portion functions as a cam and moves in a direction separating the two intermediate members MM. Thereby, the roller RO is in a state of biting into between the wedge pocket and the inner surface of the output member OM, and the rotation of the input member IM is transmitted to the output member OM via the intermediate member MM and the roller RO. The counterclockwise rotation of the input member IM is also transmitted from the output member OM to the output shaft.

On the other hand, even if the output member OM is driven to rotate from the output shaft side, as shown in fig. 7C, the two intermediate members MM are held at close positions by the tension spring TS, and a gap exists between the roller RO and the inner surface of the output member OM. Therefore, the rotation of the output member OM is not transmitted to the input member IM, and the output shaft simply idles.

The free type bidirectional clutch can be applied to, for example, a paper feed roller of a copying machine, in addition to a manually operable electric curtain, and if it is applied to this, the roller can be manually reversed when a jammed sheet is removed. Further, by using the free type bidirectional clutch, the power transmission can be automatically controlled by a simple device, and the motor of the driving source and the like can be protected even when there is an unexpected reverse input from the output shaft side without using electric power or the like as compared with the case of control by the electromagnetic clutch.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 4949196

Disclosure of Invention

Problems to be solved by the invention

As described above, the free type two-way clutch of fig. 7A to 7C is a mechanical component that is compact and can reliably control power transmission, but there is still room for improvement depending on the application. The present invention solves the following problems of the free type bidirectional clutch.

First, in the bidirectional clutch of fig. 7A to 7C, power transmission from the input shaft to the output shaft is performed by the engagement of the roller RO, and the input torque is transmitted to the output side by friction between the roller RO and the inner surface of the output member OM. If the friction force of the contact surface of the roller RO disappears, the torque transmission becomes impossible, and therefore the transmission torque of the bidirectional clutch is limited by the reduction of the friction force.

In order to transmit the rotation of the input shaft to the output shaft, it is necessary to slightly rotate the input member IM to push the two intermediate members MM apart and bring the roller RO into contact with the inner surface of the output member OM as shown in fig. 7B. The rotation of the input member IM does not immediately become the rotation of the output member OM, but a so-called dead zone exists between the input member IM and the output member OM, and noise is generated with the contact of the members. Further, when the driving torque of the input member IM is released, the input member IM is slightly pushed back by the tension spring TS and the intermediate member MM to be reversed, and therefore, position compensation for so-called 0-point return is required every time the driving torque of the input member IM is released. Accordingly, when the free type bidirectional clutch as shown in fig. 7A to 7C is interposed to perform accurate position control, the structure of the control system becomes complicated.

Means for solving the problems

In view of the above problem, the present invention is configured as follows: a driver having a plurality of external teeth formed thereon and a cylindrical member having internal teeth of the same number are combined, the driver or the like is locked when the input shaft rotates, and the revolution motion of the driver is permitted when the output shaft rotates. That is, the free type bidirectional clutch according to the aspect of the present invention is a clutch as follows:

the free type bidirectional clutch includes a housing, an input shaft and an output shaft rotatable about a common rotation axis in the housing, wherein rotation in a normal direction and a reverse direction from the input shaft is transmitted to the output shaft, and the output shaft is caused to idle to cut off transmission of rotation from the output shaft to the input shaft,

a cylindrical member rotatable about the rotation axis and a driver revolving around the rotation axis in the cylindrical member are provided in the housing,

a plurality of internal teeth are formed on an inner peripheral surface of the cylindrical member, and external teeth having the same number of teeth as the internal teeth are formed on the driver so as to enter valley portions of the internal teeth of the cylindrical member,

a central hole portion having a circular cross section is formed at one side in the axial direction of the driver, and a protruding shaft is formed at the other side,

an eccentric portion having a circular cross section and provided on the output shaft is fitted into the central hole of the driver, the protruding shaft of the driver enters the hole provided on the input shaft, a part of the outer peripheral surface of the protruding shaft contacts the wall surface of the hole of the input shaft, and the driver is capable of revolving around the rotation shaft.

In the free type bidirectional clutch according to the other aspect of the present invention, the cylindrical member may be fitted into a receiving portion provided in the housing and having a circular cross section via a rolling bearing, a plurality of internal teeth may be formed in the hole portion provided in the input shaft, and external teeth having the same number of teeth as the internal teeth may be formed in the protruding shaft of the driver so as to enter valley portions of the internal teeth of the input shaft.

In the free type bidirectional clutch according to the other aspect of the present invention, a circular plate portion fixed to the input shaft may be coupled to one end of the cylindrical member in the axial direction, the circular plate portion may be provided with the hole portion having a circular cross section at a position offset from a center of a rotation axis of the input shaft, and the driver may be provided with the protruding shaft having a circular cross section that enters the hole portion.

Preferably, a center shaft is formed in a center portion of one of the opposing surfaces of the input shaft and the output shaft, and a center hole into which the center shaft is fitted is formed in a center portion of the other of the opposing surfaces.

Further, a spring that applies a restraining force to the rotation of the input shaft may be provided between the housing and the input shaft.

Effects of the invention

The free type bidirectional clutch of the present invention is provided with an input shaft and an output shaft which are rotatable about a common rotation shaft in a non-rotatable housing, and a driver formed with a plurality of external teeth and a cylindrical member formed with internal teeth having the same number as the external teeth are housed in the housing in combination. A central hole part with a circular section is formed on one side of the axial direction of the driving piece, an eccentric wheel arranged on an output shaft is embedded in the central hole part, and a protruding shaft is formed on the other side of the driving piece, enters the hole part arranged on the input shaft and contacts with the wall surface of the hole part.

When the input shaft rotates, as will be described later in detail, the input shaft, the cylindrical member, and the driver are locked, and the driver rotates integrally with the input shaft around the rotation axis of the input shaft. Since the eccentric of the output shaft is embedded in the driver, the rotation shaft of the output shaft is the same as the input shaft, and therefore, the result is that the input shaft is integrated with the output shaft via the driver. Therefore, the rotation in the normal and reverse directions from the input shaft is transmitted to the output shaft as it is, and the output shaft rotates in the same direction at the same rotation speed.

On the other hand, when the output shaft rotates, the center of the driver of the eccentric wheel fitted into the output shaft moves (circular motion) around the common rotation shaft, but a plurality of external teeth are formed on the driver, and the driver is combined with a cylindrical member having internal teeth with the same number as the external teeth. Thus, the driver revolves around the common rotation axis without rotating in the cylindrical member, and at this time, no rotational torque acts on the cylindrical member. The protruding shaft of the rotor enters the hole of the input shaft and partially contacts the wall surface of the hole, but since the protruding shaft and the cylindrical member are engaged with each other so as to allow revolution movement in the same relationship as the driver, no rotational torque acts on the output shaft by the revolution of the driver. In other words, even if the output shaft rotates, the driver revolves only inside the cylindrical member, the output shaft idles, and the rotation of the output shaft is not transmitted to the input shaft.

In this way, in the free type bidirectional clutch of the present invention, the power is transmitted from the input shaft to the output shaft by the driver and the cylindrical member that allow the revolution motion, and the transmission in the opposite direction is interrupted by idling the output shaft. The transmission to the output shaft is performed by bringing the driver and the cylindrical member into the locked state, and the transmission torque is not limited by the reduction in the frictional force because the frictional force is not utilized. Since the locked state of the drive member or the like occurs immediately before the drive from the output shaft, there is no dead zone, and the position adjustment for the 0-point return can be omitted.

Unlike the free type bidirectional clutch of fig. 7A to 7C, the free type bidirectional clutch of the present invention does not use a tension spring for blocking the transmission of rotation from the output shaft to the input shaft. The existence of the spring sometimes causes the manufacturing and assembling operation of the mechanical device to become difficult, but the hidden trouble does not exist in the invention.

In the free type bidirectional clutch according to the present invention, the cylindrical member formed with the internal teeth may be fitted into the receiving portion of the housing having a circular cross section via the rolling bearing, and the protruding shaft of the driver formed with the external teeth may be combined with the hole portion of the input shaft formed with the internal teeth to engage the protruding shaft of the driver so as to allow the revolution motion of the driver. Since the cylindrical member and the input shaft are separate members, the cylindrical member is simple in shape, and the manufacture and the processing of the internal teeth are easy.

In the free type bidirectional clutch according to the present invention, a circular plate portion fixed to the input shaft may be coupled to one end of the cylindrical member in the axial direction, a hole portion having a circular cross section may be provided at a position offset from the center of the circular plate portion, and a protruding shaft having a circular cross section of the driver may be engaged with the hole portion so as to allow the revolving motion of the driver. In this two-way clutch, the cylindrical member and the input shaft can be made as a single member, and the number of members can be reduced accordingly. Further, the structure of the engaging portion between the driver and the input shaft is simplified, and the manufacturing process is facilitated.

In the free type bidirectional clutch of the present invention, a center shaft may be formed on one of the opposing surfaces of the input shaft and the output shaft, a center hole may be formed on the other, and the center shaft may be fitted into the center hole. The center shaft is supported by the center hole, and the input shaft and the output shaft can be stably supported and rotated.

In the free type bidirectional clutch according to the present invention, a spring may be provided between the housing and the input shaft to apply a restraining force to the rotation of the input shaft. Since the input shaft is provided to be rotatable and is in contact with the protruding shaft of the driver, if the driver revolves during rotation of the output shaft, the interlocking rotation is caused so as to interlock with the revolution of the driver, which may cause the input shaft to rotate. When a restraining force is applied to the input shaft by the spring, the rotation of the input shaft is reliably prevented, and the transmission of the rotation from the output shaft to the input shaft is prevented. The restraining force by the spring is sufficient if it is a small force to prevent the interlocking rotation by friction or the like.

Further, according to another aspect of the present invention, there is provided a drive device including the free type bidirectional clutch according to each aspect of the present invention, a drive source connected to the input shaft, and a drive mechanism connected to the output shaft and configured to transmit and drive rotation from the input shaft via the output shaft.

The objects, aspects, and effects of the present invention described above, as well as those of the present invention not described above, will be understood by those skilled in the art by referring to the drawings and the description of the claims, the embodiments for carrying out the following invention (detailed description of the invention).

Drawings

Fig. 1A is a configuration diagram showing a 1 st embodiment of a free type bidirectional clutch of the present invention.

FIG. 1B is a cross-sectional view A-A of FIG. 1A.

FIG. 1C is a cross-sectional view B-B of FIG. 1A.

FIG. 1D is a cross-sectional view C-C of FIG. 1A.

Fig. 2A is a diagram illustrating an operation of the free type bidirectional clutch according to embodiment 1 when the input shaft rotates.

Fig. 2B is a sectional view a-a of fig. 2A.

Fig. 2C is a sectional view B-B of fig. 2A.

Fig. 2D is a diagram illustrating an operation of the free type bidirectional clutch according to embodiment 1 when the output shaft rotates.

Fig. 2E is a cross-sectional view a-a of fig. 2D.

Fig. 2F is a cross-sectional view B-B of fig. 2D.

Fig. 3A is a single body diagram of the input shaft in the free-type bidirectional clutch of embodiment 1.

Fig. 3B is a view of the input shaft of fig. 3A as viewed from the opposite side of the case-side end portion.

Fig. 3C is a view of the input shaft of fig. 3A as viewed from the housing-side end.

Fig. 3D is a single body diagram of the output shaft in the free-type bidirectional clutch of embodiment 1.

Fig. 3E is a view of the output shaft of fig. 3D as viewed from the case-side end.

Fig. 3F is a view of the output shaft of fig. 3D as viewed from the opposite side of the case-side end portion.

Fig. 4A is a simplified diagram of a cylindrical member as a power transmission-related member in the free type two-way clutch of embodiment 1.

Fig. 4B is a view showing the inside of the cylindrical member of fig. 4A.

Fig. 4C is a fragmentary view of a driver as a power transmission-related component in the free-type bidirectional clutch of embodiment 1.

Fig. 4D is a view of the driver of fig. 4C as viewed from the input shaft side end.

Fig. 4E is a view of the driver of fig. 4C as viewed from the output shaft side end portion.

Fig. 5A is a configuration diagram showing embodiment 2 of the free type bidirectional clutch of the present invention.

Fig. 5B is a sectional view a-a of fig. 5A.

Fig. 5C is a sectional view B-B of fig. 5A.

Fig. 5D is a cross-sectional view C-C of fig. 5A.

Fig. 6A is a simplified diagram of the input shaft and the cylindrical member as the power transmission-related members in the free-type two-way clutch according to embodiment 2.

Fig. 6B is a view of the input shaft and the cylindrical member of fig. 6A as viewed from the input shaft side end portion.

Fig. 6C is a view of the input shaft and the cylindrical member of fig. 6A as viewed from the output shaft side.

Fig. 6D is a fragmentary view of a driver as a power transmission-related component in the free-type bidirectional clutch of embodiment 2.

Fig. 6E is a view of the driver of fig. 6D as viewed from the input shaft side end.

Fig. 6F is a view of the driver of fig. 6D as viewed from the output shaft side end portion.

Fig. 6G is a simplified diagram of the output shaft as the power transmission-related member in the free-type bidirectional clutch according to embodiment 2.

Fig. 6H is a view of the output shaft of fig. 6G as viewed from the input shaft side end portion.

Fig. 6I is a view of the output shaft of fig. 6G as viewed from the output shaft side end portion.

Fig. 7A is a diagram showing an overall structure of an example of a conventional free type bidirectional clutch.

Fig. 7B is a diagram showing an operation when the input shaft of the free type bidirectional clutch of fig. 7A rotates.

Fig. 7C is a diagram showing an operation when the output shaft of the free type bidirectional clutch of fig. 7A rotates.

Detailed Description

Embodiment 1

Hereinafter, a free type bidirectional clutch according to embodiment 1 of the present invention will be described with reference to the drawings. Fig. 1A to 1D show the overall configuration of a 1 st embodiment of a free type bidirectional clutch according to the present invention, and fig. 2A to 2F show explanatory views of the operation thereof. Fig. 3A to 3F and fig. 4A to 4E are views showing main components of the free type bidirectional clutch according to embodiment 1 in a single state.

As shown in fig. 1A to 1D, the free-type bidirectional clutch according to embodiment 1 includes an input shaft 2 and an output shaft 3 disposed at the center of a fixed housing 1 having a circular cross section. The case 1 is a cup-shaped member including a circumferential wall portion and an end plate portion, and a disc-shaped shield 1S for closing the inside is press-fitted into an opening end portion. The input shaft 2 and the output shaft 3 have a common rotation axis o, which is the same as the central axis of the housing 1. The input shaft 2 is axially supported through the center of the end plate portion of the housing 1, and the output shaft 3 is axially supported through the center of the shield 1 s. As shown in a section C-C of fig. 1D, a shallow recess in which the C-ring 4 is disposed is provided in the end plate portion of the housing 1, and the C-ring 4 functions as a spring that is in contact with the input shaft 2 and applies a constant restraining force to the rotation of the input shaft 2.

A cylindrical member 5 is provided inside the housing 1 via a rolling bearing BR1 fitted into the inner surface of the circumferential wall portion. As shown in a section B-B of fig. 1C (see also fig. 4A and 4B which are single drawings of the cylindrical member), the cylindrical member 5 has a central axis aligned with the rotation axis o and has a plurality of internal teeth 5t formed on its inner circumferential surface. The input shaft 2 is fitted into one end of the cylindrical member 5 via a rolling bearing BR2, and a disc-shaped shield 5s through which the output shaft 3 passes is fitted into the opposite end.

A driver 6 is disposed inside the cylindrical member 5, and outer teeth 6t having the same number of teeth are formed on the outer periphery thereof so as to enter the root portions of the inner teeth 5t of the cylindrical member 5 (see also fig. 4C to 4E, which are simple drawings of the driver). The driver 6 is disposed inside the cylindrical member 5 with its central axis o' being offset from the rotational axis o by an amount e. Thus, in the state of the cross section B-B in fig. 1C, the external teeth 6t of the driver 6 enter the valleys of the internal teeth 5t of the cylindrical member 5 on the upper side, and the external teeth 6t are separated from the internal teeth 5t on the lower side. In other words, when the driver 6 does not rotate but moves (revolves) around the rotation axis o with its central axis o' relatively, the inner circumferential surface of the cylindrical member 5 formed with the internal teeth 5t becomes an envelope constituted by the outer circumferential surface of the driver 6 provided with the external teeth 6 t.

A protruding shaft 6s having a plurality of external teeth 6st formed on the outer periphery thereof is provided at the end of the driver 6 on the input shaft 2 side, and the protruding shaft 6s enters a hole 2r provided in the input shaft 2. As shown in a section a-a of fig. 1B, internal teeth 2rt having the same number of teeth as that of external teeth 6st are formed in the hole portion 2r of the input shaft 2, and the external teeth 6st of the protruding shaft 6s enter the valleys of the internal teeth 2rt of the hole portion 2r, respectively, in the same manner as the relationship between the external teeth 6t on the outer periphery of the driver 6 and the internal teeth 5t of the cylindrical member 5 (see also fig. 3A to 3C, which are simple diagrams). A center hole portion 6r having a circular cross section is formed at an end portion of the driver 6 on the output shaft 3 side, and an eccentric 3s having a circular cross section provided on the output shaft 3 is fitted into the center hole portion 6r via a rolling bearing BR 3. The center of the eccentric 3s is separated from the rotation axis o of the output shaft 3 by an amount e (see also fig. 3D to 3F as a single figure).

A center shaft 3p extending toward the input shaft 2 is provided in the center of the output shaft 3, and the center shaft 3p is fitted into a center hole 2h formed in the center of the input shaft 2 through a through hole 6h in the center of the driver 6. Thereby, the input shaft 2 and the output shaft 3 are supported by each other, and the inclination of the shafts and unstable operation during rotation are prevented.

Here, the operation of the free type bidirectional clutch according to embodiment 1 of fig. 1A to 1D will be described with reference to fig. 2A to 2F.

As shown by arrows in a section a-a in the upper view of fig. 2B, for example, when the input shaft 2 is rotated counterclockwise (as viewed from the input shaft direction) by the motor of the drive source, a rotational torque about the rotation axis o is applied to the driver 6 via the protruding shaft 6s so that the outer teeth 6st are pressed from the outside by the inner peripheral surface of the hole portion 2r at the contact point where the inner peripheral surface of the hole portion 2r of the input shaft 2 contacts the outer teeth 6st of the protruding shaft 6s of the driver 6. At this time, since the cylindrical member 5 is supported rotatably about the rotation axis o by the bearing BR1 in the housing 1, the input shaft 2, the driver 6, and the cylindrical member 5 rotate about the rotation axis o in an integrally locked state. The rotation of the drive 6 rotates the output shaft 3 coupled through the eccentric 3s, and as a result, the driving force is transmitted to a mechanical device connected to the output shaft 3, such as a rolling mechanism of a window blind. The same applies to the transmission of the driving force in which the members between the input and output shafts such as the driver 6 are integrally locked, even when the rotation direction of the input shaft 2 is opposite (clockwise when viewed from the input shaft direction).

On the other hand, as shown by an arrow in the axial longitudinal sectional view of fig. 2D, when the output shaft 3 rotates in the clockwise direction (as viewed from the output shaft direction), the central axis o' of the driver 6 moves on the circumference of the radius e around the rotation axis o of the output shaft 3 by the eccentric 3s fitted in the driver 6. Since the driver 6 is formed with a plurality of external teeth 6t on the outer periphery thereof, and the external teeth enter the valleys of the internal teeth 5t of the same number of teeth formed on the inner peripheral surface of the cylindrical member 5, and are combined with the cylindrical member 5, the driver 6 does not rotate (spin) inside the cylindrical member 5. Therefore, all points on the driver 6 move on the circumference of the radius e as indicated by the small circular arrows in the section B-B of fig. 2F, and no rotational torque is imparted to the cylindrical member 5. This relationship is the same for the protruding shaft 6s of the driver 6 and the hole 2r of the input shaft 2 (see the section a-a in fig. 2E), and the driver 6 revolves around the rotation axis o without applying a rotational torque to the input shaft 2.

Since the driver 6 is engaged with the cylindrical member 5 and the input shaft 2 so as to allow the revolution motion, even if the output shaft 3 rotates, the driver 6 revolves only in the fixed cylindrical member 5, the output shaft 3 idles, and the rotation of the output shaft 3 is not transmitted to the input shaft 2. For example, in a power transmission system of a curtain winding-up mechanism that drives a curtain connected to the output shaft 3, the curtain can be manually lifted and lowered while keeping a motor of a drive source stopped.

In the free type bidirectional clutch of the embodiment of fig. 1A to 1D, a C-ring 4 is provided in contact with the input shaft 2. The C-ring 4 functions as a spring that applies a certain restraining force to the rotation of the input shaft 2, and prevents the input shaft 2 from rotating in conjunction with the friction between the driver 6 and the contact portion of the input shaft 2.

Embodiment 2

Next, a free type bidirectional clutch according to embodiment 2 of the present invention will be described with reference to fig. 5A to 5D and fig. 6A to 6I. Fig. 5A to 5D show the entire structure of the free type bidirectional clutch of embodiment 2, and fig. 6A to 6I show the main components in a single state.

As shown in the upper right axial longitudinal sectional view of fig. 5A, the free-type bidirectional clutch according to embodiment 2 includes an input shaft 20 and an output shaft 30 which are disposed in the center of a fixed housing 10 having a circular cross section and are rotatable about a common rotation axis o. The case 10 is a cup-shaped member including a circumferential wall portion and an end plate portion, and a disc-shaped shield 10s for closing the inside is press-fitted into an opening end portion, as in the case of embodiment 1. In embodiment 2, a recess is provided in the end plate portion and the shield 10s, and rolling bearings for the input shaft 20 and the output shaft 30 are press-fitted therein.

As shown in the single body diagrams of fig. 6A to 6I, the input shaft 20 has a disk portion 20d and a cylindrical portion 50 integrally formed at one end of a shaft portion, and the disk portion 20d and the cylindrical portion 50 are housed inside the casing 10. A plurality of internal teeth 50t are formed on the inner circumferential surface of the cylindrical portion 50, a driver 60 is disposed inside the cylindrical portion 50, and external teeth 60t having the same number of teeth that enter the valleys of the internal teeth 50t of the cylindrical portion 50 are formed on the outer circumference thereof. In other words, the driver 60 is a member corresponding to the driver 6 of embodiment 1, the cylindrical portion 50 is a member corresponding to the cylindrical member 5 of embodiment 1, and is a separate member from the cylindrical member 5 of embodiment 1, and in embodiment 2, the cylindrical portion 50 is a member having one end thereof joined to the disk portion 20d fixed to the input shaft 20 and integrated with the input shaft 20.

A protruding shaft 60s having a circular cross section is provided at the end of the driver 60 on the input shaft 20 side, and the protruding shaft 60s enters a hole 20r having a circular cross section provided at a position offset from the center of the circular plate portion 20d and contacts the wall surface of the hole 20r (see cross section B-B of fig. 5C).

As in embodiment 1, a central hole 60r having a circular cross section is formed in the end portion of the driver 60 on the output shaft 30 side, and an eccentric 30s having a circular cross section provided on the output shaft 30 is fitted into the central hole 60r via a rolling bearing. The center of the eccentric wheel 30s is separated from the rotation axis o of the output shaft 30 by an amount e (see a section a-a of fig. 5B), and the driver 60 performs an orbital motion in the cylindrical portion 50. A center shaft 30p provided at the center of the output shaft 30 is fitted into a center hole 20h formed at the center of the input shaft 20.

When the input shaft 20 rotates about the rotation axis o, the circular plate portion 20d of the input shaft 20 rotates together with the cylindrical portion 50. Since the protruding shaft 60s of the driver 60 contacts the hole 20r of the circular plate portion 20d and the external teeth 60t contact the cylindrical portion 50, the driver 60 rotates integrally with the input shaft 20 so that the protruding shaft 60s and the external teeth 60t are pressed from the outside by the rotation of the input shaft 20. The rotation of the driver 60 rotates the output shaft 3 coupled by the eccentric 30s, and the rotation of the input shaft 20 is transmitted to the output shaft 3 as it is via the locked driver 60.

On the other hand, when the output shaft 30 rotates, the center of the driver 60 moves on the circumference of the radius e around the rotation axis o by the eccentric 30s fitted into the driver 60. At this time, the external teeth 60t of the driver 60 are fitted to the internal teeth 50t of the inner circumferential surface of the cylindrical portion 50, so that the driver 60 performs only the revolution motion in which all points move on the circumference of the radius e, and the rotation is not caused. The protruding shaft 60s of the driver 60 revolves only in the hole 20r, and the output shaft 30 idles, so that the rotation of the output shaft 30 is not transmitted to the input shaft 20.

In the free-type bidirectional clutch according to embodiment 2, the cylindrical member (cylindrical portion) 50 is configured as a part of the input shaft 20 coupled via the disc portion 20d, and therefore the number of components can be reduced. Further, the engaging portion between the driver 60 and the input shaft 20 is formed by engagement between a shaft having a circular cross section and a hole, so that the structure is simple and the manufacturing process is easy.

As described above in detail, the free type bidirectional clutch according to the embodiment of the present invention is configured such that: when the input shaft is rotated, the driver and the like can be locked to transmit power, and when the output shaft is rotated, the revolution motion of the driver is allowed to idle the output shaft. In the above-described embodiment, the rolling bearing is interposed between the eccentric wheel of the output shaft and the driver, but the rolling bearing may be omitted and a sliding bearing structure may be employed. Further, it is understood that the various modifications of the above-described embodiment are possible by providing an axial thrust bearing between the input/output shaft and the drive member, and by realizing smooth rotation of each movable member.

Although the specific embodiments have been described above, the embodiments are merely examples, and are not intended to limit the scope of the present invention. The apparatus and methods described in this specification can be embodied in other ways than those described above. Further, the above-described embodiments may be appropriately omitted, replaced, or modified without departing from the scope of the present invention. The embodiments in which the omission, substitution, and modification are performed are included in the scope of the contents described in the claims and their equivalents, and belong to the technical scope of the present invention.

The present application is an application based on japanese patent application No. 2013-148316 (application No. 2013, 7/17), and claims priority from the above-mentioned japanese application, the disclosure of which is incorporated herein by reference in its entirety.

Description of the reference numerals

1. 10 casing

2. 20 input shaft

2r and 20r holes

2rt internal teeth

20d disc part

3. 30 output shaft

3s and 30s eccentric wheel

4C type ring

5. 50 cylindrical part

5t and 50t internal teeth

6. 60 drive element

6r, 60r center hole

6s and 60s protruding shaft

6t and 60t external teeth

Claims (9)

1. A free type two-way clutch having a housing, an input shaft and an output shaft rotatable about a common rotation axis in the housing, wherein rotation in the forward and reverse directions from the input shaft is transmitted to the output shaft, and the output shaft idles to cut off transmission of rotation from the output shaft to the input shaft,

a cylindrical member rotatable about the rotation axis and a driver that does not rotate while revolving around the rotation axis in the cylindrical member are provided in the housing,

a plurality of internal teeth are formed on an inner peripheral surface of the cylindrical member, and external teeth having the same number of teeth as the internal teeth are formed on the driver so as to enter valley portions of the internal teeth of the cylindrical member,

a central hole portion having a circular cross section is formed at one side in the axial direction of the driver, and a protruding shaft is formed at the other side,

an eccentric portion having a circular cross section and provided on the output shaft is fitted into the central hole of the driver, the protruding shaft of the driver enters a hole provided on the input shaft, a part of the outer peripheral surface of the protruding shaft contacts the wall surface of the hole of the input shaft, and the protruding shaft of the driver is capable of revolving around the rotation shaft in the hole and does not rotate.

2. The free-form bi-directional clutch of claim 1,

the cylindrical member is fitted into a receiving portion provided in the housing and having a circular cross section through a rolling bearing, a plurality of internal teeth are formed in the hole provided in the input shaft, and external teeth having the same number of teeth as the internal teeth are formed in the protruding shaft of the driver so as to enter the valley portions of the internal teeth of the input shaft.

3. The free-form bi-directional clutch of claim 1,

a circular plate portion fixed to the input shaft is coupled to one end of the cylindrical member in the axial direction, the circular plate portion is provided with the hole portion having a circular cross section at a position offset from the center of the rotation axis of the input shaft, and the driver is provided with the protruding shaft having a circular cross section that enters the hole portion.

4. The free-form bidirectional clutch according to any one of claims 1 to 3,

a center shaft is formed in a center portion of one of the opposing surfaces of the input shaft and the output shaft, and a center hole into which the center shaft is fitted is formed in a center portion of the other.

5. The free-form bidirectional clutch according to any one of claims 1 to 3,

a spring for applying a restraining force to the rotation of the input shaft is provided between the housing and the input shaft.

6. The free-form bidirectional clutch according to any one of claims 1 to 3,

a center shaft is formed at a center portion of one of the opposing surfaces of the input shaft and the output shaft, and a center hole into which the center shaft is fitted is formed at a center portion of the other,

a spring for applying a restraining force to the rotation of the input shaft is provided between the housing and the input shaft.

7. A driving device is characterized by comprising:

a free-form bidirectional clutch as claimed in any one of claims 1 to 3;

a drive source connected to the input shaft; and

and a drive mechanism coupled to the output shaft and configured to transmit and drive rotation from the input shaft through the output shaft.

8. A driving device is characterized by comprising:

the free-type bidirectional clutch according to any one of claims 1 to 3, wherein a center shaft is formed in a center portion of one of the opposing surfaces of the input shaft and the output shaft, and a center hole into which the center shaft is fitted is formed in a center portion of the other of the opposing surfaces;

a drive source connected to the input shaft; and

and a drive mechanism coupled to the output shaft and configured to transmit and drive rotation from the input shaft through the output shaft.

9. A driving device is characterized by comprising:

the free-type bidirectional clutch according to any one of claims 1 to 3, wherein a center shaft is formed at a center portion of one of the opposing surfaces of the input shaft and the output shaft, and a center hole into which the center shaft is fitted is formed at a center portion of the other of the opposing surfaces, and a spring that applies a restraining force to rotation of the input shaft is provided between the housing and the input shaft;

a drive source connected to the input shaft; and

and a drive mechanism coupled to the output shaft and configured to transmit and drive rotation from the input shaft through the output shaft.