JP6545222B2 - Free type two-way clutch that uses idle rotation of gears - Google Patents

Description

  The present invention relates to a clutch device that changes a power transmission state between an input shaft and an output shaft, in particular, transmitting power of forward and reverse rotation from the input shaft to the output shaft and transmitting power from the output shaft The present invention relates to a free type two-way clutch that cuts off by making the output shaft idle.

  In a power transmission system that drives a mechanical device or a working device 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 two-way clutch is an output shaft for both forward and reverse rotation of the input shaft in power transmission from the input shaft (drive side) to the output shaft (follower side) The function of transmitting and reversing power transmission from the output shaft to the input shaft in the opposite direction is provided. The two-way clutch has a clutch that causes the output shaft to slip when the power transmission from the output shaft is interrupted, and is called a free type two-way clutch.

  The free type two-way clutch can be applied to, for example, an open / close drive device capable of manually operating a windup electric curtain or the like. In this case, the free type two-way clutch is interposed between the drive motor and the winding mechanism of the curtain, the driving motor is connected to the input shaft, and the winding mechanism is connected to the output shaft. The curtain can be moved up and down by rotating the drive motor forward and reverse, and at the stop position of the drive motor, manual operation of the winding mechanism is possible. At this time, since the output shaft slips, it becomes a drive motor. There is no adverse effect. These functions can be achieved by installing and disconnecting an electromagnetic clutch between the drive motor and the winding mechanism, but operating the electromagnetic clutch requires power and complex control for power control. An apparatus etc. are also needed.

As a free type two-way clutch, for example, a two-way clutch described in Patent No. 6027702 according to the present applicant's invention is known, which will be described with reference to FIG.
As shown in FIG. 9, in this free type two-way clutch, an input shaft I and an output shaft O rotatable about a common central axis are provided in a fixed housing H. A sun gear SG concentric with the output shaft O is fixed to the output shaft O. Further, in the housing H, a pair of planet gear bodies PB having planet gears PG meshing with the sun gear SG are disposed, and the pair of planet gear bodies PB are rotatably supported by a carrier C. An actuator M is attached to each of the pair of planetary gear bodies PB via a one-way clutch OC that allows idle rotation in different rotational directions, and a cam body CB in contact with the operator M is provided on the input shaft I It is done. Then, linear portions are respectively formed on the cross sections of the actuator M and the cam body CB, and the actuators M are disposed on one side and the other side of the cam body CB such that the linear portions abut each other. There is.

  When the input shaft I is rotated, the outer peripheral surface of the actuator M in the planetary gear body CB located at a short distance in the rotational direction out of the pair of planetary gear bodies CB is straight with the outer peripheral surface of the cam body CB of the input shaft I Contact with overlapping parts. In this state, the cam body CB of the input shaft I rotates the carrier C in the same direction via the planet gear PG of the planet gear body PB in contact, and the other planet gear body on which the operator M is not in contact The PB is likewise moved in its direction of rotation. Here, although the planetary gear PG of the planetary gear body PB meshes with the sun gear SG of the output shaft O, since the rotation (rotation) is restrained by the one-way clutch OC, the sun gear SG is the planetary gear PG. The output shaft O is integrated with the input shaft I and rotates in the same direction.

On the other hand, when the output shaft O rotates, the planetary gear PG meshing with the sun gear SG tries to rotate around the support shaft of the carrier C. However, at the position where the input shaft I has stopped, the linear portion of the actuator M of one planetary gear unit PB and the linear portion of the cam body CB overlap, and the actuator M can not rotate as it is .
In the free type two-way clutch of FIG. 9, in this state, if the rotation direction of the output shaft O is the same as the rotation direction before the input shaft I stopped, the planetary gear PG (the sun gear SG Since it is integrated with the actuator M by the one-way clutch OC), the motor M is moved slightly in the rotational direction of the sun gear SG to move the operator M from the cam body CB. When released, the output shaft O becomes rotatable. On the other hand, if the rotation direction of the output shaft O is opposite to the rotation direction before the input shaft I stops, the planetary gear PG is separated from the actuator M by the one-way clutch OC. Therefore, even if the linear portion of the actuator M and the linear portion of the cam body CB overlap and the rotation of the actuator M itself is restrained, the planetary gear PG can rotate and transmits the rotation to the input shaft I. Without this, the output shaft O can be rotated.

Patent No. 6027702

  As described above, in the free type two-way clutch of FIG. 9, the output shaft can be idled in both directions while maintaining the position at which the input shaft is stopped. As a result, in order to enable the idle rotation in the reverse direction of the output shaft, a complicated operation such as returning the input shaft slightly from the stopped position is unnecessary, and the user-friendliness is excellent. However, the free type two-way clutch of FIG. 9 has room for improvement in the following points.

  In the free type two-way clutch of FIG. 9, the one-way clutch OC is attached to the pair of planetary gear bodies PB so as to enable idling regardless of the rotation direction of the output shaft O. Is relatively large, and the entire apparatus becomes large. Further, since the one-way clutch OC has a large number of parts constituting itself and the structure thereof is complicated, the manufacturing and assembling work of the entire device including the one-way clutch OC is not easy.

In order to solve the above-mentioned problems, the free type two-way clutch of the present invention is provided with a projecting portion which protrudes in the axial direction and whose outer periphery has a circular cross-sectional shape on the planetary gear body. A space having a slanted outer edge is defined on the input shaft, and the projection is inserted into the space, and when the input shaft is driven to rotate, between the outer edge of the space and the projection Biting occurs to prevent rotation of the planetary gear body and transmit rotation to the output shaft, whereas when the output shaft side is driven to rotate, the planetary gear body is allowed to rotate and is made to idle, It blocks the transmission of rotation to the input shaft. That is, the first invention of the present application is
"A non-rotatable housing and an input shaft and an output shaft rotatable around a common central axis in the housing, and forward and reverse rotation from the input shaft is transmitted to the output shaft The transmission of rotation from the output shaft to the input shaft is a free type two-way clutch in which the output shaft is disengaged and disconnected.
A sun gear is fixed to the output shaft, and a planetary gear body having a planetary gear meshing with the sun gear is rotatably supported inside the housing, and the planetary gear body is rotatably supported around the common central axis. A rotatable carrier, and a spring for applying a predetermined frictional force between the output shaft and the carrier;
The planetary gear body is provided with a projecting portion that protrudes in the axial direction and has a circular cross-sectional shape, and the input shaft is provided with a space portion into which the protruding portion is inserted, in the space portion The radially outer edge includes one side extending obliquely inward in the radial direction toward one side in the circumferential direction and the other side extending inward in the radial direction toward the other side in the circumferential direction ,
When the input shaft is driven to rotate, biting occurs between the outer edge of the space and the projection, rotation of the planetary gear is prevented, and the sun gear is the planetary gear and the planetary gear. While rotating integrally with the carrier, when the output shaft is driven and rotated, rotation of the planetary gear body is permitted, and transmission of rotation to the input shaft is blocked. "
It is a free type two-way clutch characterized by

Wherein the outer edge the side portion and the other side portion of the may be between line symmetrical with respect to a straight line extending through both of the intermediate in the radial direction.

The second invention of the present application is
"A non-rotatable housing and an input shaft and an output shaft rotatable around a common central axis in the housing, and forward and reverse rotation from the input shaft is transmitted to the output shaft The transmission of rotation from the output shaft to the input shaft is a free type two-way clutch in which the output shaft is disengaged and disconnected.
A sun gear is fixed to the output shaft, and a plurality of planet gear bodies having planet gears meshing with the sun gear are rotatably supported inside the housing, and the planet gear bodies are rotatably supported and the common central axis A carrier rotatable around the first and second springs, and a spring for applying a predetermined frictional force between the output shaft and the carrier;
The planetary gear body is provided with a projecting portion projecting in the axial direction and having a circular cross-sectional shape, and the input shaft is provided with a pair of space portions into which the projecting portions of the planetary gear body are respectively inserted. And each of the pair of space portions is disposed circumferentially adjacent to each other, and one outer edge of the pair of space portions extends radially inward toward one circumferential side, and The outer edge of the rim extends radially inward toward the other side in the circumferential direction,
When the input shaft is driven to rotate, biting is caused between the outer edge and the projecting portion in one of the pair of space portions, rotation of the planetary gear is prevented, and the sun gear is rotated. Is integrally rotated with the planetary gear body, and when the output shaft is driven and rotated, rotation of the planetary gear body is permitted, and transmission of rotation to the input shaft is interrupted. "
It is a free type two-way clutch characterized by

The outer edges of each of the pair of spaces are both straight, and the outer edge of each of the pair of spaces is axisymmetrical to a straight line extending radially between the two Is good .

In the first and second inventions of the present application described above, the following embodiments are preferable. That is,
The spring is a wave spring.
The input shaft and the output shaft are respectively formed with a concave portion and a convex portion rotatably fitted with each other coaxially with the common central axis.
A rolling element is provided between the output shaft and the housing to reduce the frictional force.
A carrier auxiliary plate is integrally coupled to the carrier at a position opposite to each other with the planetary gear interposed therebetween.

In the free type two-way clutch of the first invention of the present application, an input shaft and an output shaft rotatable about a common rotation axis are provided in a fixed housing, and a sun gear is provided on the output shaft. Inside the housing, there are further provided a planetary gear body formed with a planetary gear meshing with a sun gear, and a carrier which rotatably supports the planetary gear body and which itself is also rotatable around the common rotation axis. . The planetary gear body is provided with a projecting portion which protrudes in the axial direction and whose cross-sectional shape is circular. The input shaft is provided with a space into which the protrusion is inserted, and the outer edge in the radial direction in the space is one side portion extending inward in the radial direction toward one side in the circumferential direction, and the other And the other side portion extending radially inward toward the side. Then, a spring for providing a predetermined frictional force is disposed between the output shaft and the carrier.

When the input shaft is driven and rotated, the outer edge of the space provided on the input shaft extends radially inward toward the circumferential direction as described in detail with reference to FIG. A bite occurs between the outer edge of the space and the projection and rotation of the planetary gear is prevented. Therefore, the input shaft and the planetary gear unit are integrated and locked, and the output shaft having the sun gear is also locked to the input shaft by meshing with the planetary gear of the planetary gear unit. As a result, the input shaft is integrated with the output shaft through the planetary gear body, and the positive and reverse rotations of the input shaft are directly transmitted to the output shaft, and the output shaft rotates in the same direction at the same rotation speed as the input shaft. Do.

When the output shaft is driven to rotate, the planetary gear having a planetary gear meshing with the sun gear rotates. At this time, at the position where the rotation of the input shaft is stopped, biting is caused between the outer edge of the space portion and the projecting portion of the planetary gear body, so that the following effects can be obtained. .

That is, if the drive rotation direction of the output shaft is the same direction as it had been rotating before the input shaft stopped, the protrusion will be in the space, as will be described in detail with reference to FIG. It tries to rotate in the direction opposite to the rotation direction of the output shaft. The direction of rotation of the protrusion is to rotate from the wide side to the narrow side in a virtual weir space whose one side is the tangential direction component of the protrusion at the part where the biting occurs. This is the direction in which the above biting occurs. On the other hand, a spring for applying a predetermined frictional force is disposed between the output shaft and the carrier, and when the output shaft is rotated as described above, the projecting portion is made of the output shaft due to the frictional force. Move slightly in the same direction as the rotation direction. The direction of movement of the projection is a direction away from the outer edge in the space, that is, a direction in which the biting is released. Therefore, the protrusions, at the same time as the rotation in the direction causing biting to the outer edge of the space, in order to wholly move slightly in a direction with such bite is released, as a result, the space It is possible to rotate without causing any bite in the part .

On the other hand, if the drive rotational direction of the output shaft is the reverse of the direction in which the input shaft was rotating before stopping, as described later in detail with reference to FIG. The friction force causes a slight movement in the same direction as the rotation direction of the output shaft. The movement direction of such a protrusion is a direction approaching the outer edge in the space, that is, a direction in which the above-mentioned biting occurs. On the other hand, the projecting portion tries to rotate in the space portion in the direction opposite to the rotation direction of the output shaft. The direction of rotation of the protrusion is intended to rotate from the narrow side to the wide side in the virtual weir space described above, which is the direction to release the biting . Therefore, the protrusions, at the same time as the overall slightly moves in the direction resulting in biting to the outer edge of the space, to rotate in a direction with such bite is released, as a result, the space It is possible to rotate without causing any bite in the part .

  As described above, in the free type two-way clutch according to the present invention, the output shaft can be idled in both directions while maintaining the position at which the input shaft is stopped. In this case, the size can be reduced and the number of parts can be reduced as compared with the conventional free type two-way clutch shown in FIG. 9, whereby manufacturing and assembly operations can be easily performed.

  In the free type two-way clutch of the second invention of the present application, the space portion in the first invention mentioned above is directed to the space portion extending inward in the radial direction toward one circumferential direction and the other side in the circumferential direction And the projecting portion is inserted into each of the pair of space portions, and therefore, the second invention of the present application. Has the same effects as the first invention of the present application.

FIG. 1 is a structural view showing an embodiment of a free type two-way clutch of the first invention of the present application. It is a figure which shows the operation | movement at the time of the input shaft rotation of the free type two-way clutch shown in FIG. It is a figure which shows the operation | movement at the time of the output-shaft positive rotation of the free type two-way clutch shown in FIG. It is a figure which shows the operation | movement at the time of the output shaft reverse rotation of the free type two-way clutch shown in FIG. It is a figure which shows the single-piece figure of the component of the free type two-way clutch shown in FIG. It is a figure which shows the single-piece figure of the component of the free type two-way clutch shown in FIG. FIG. 6 is a structural view showing a modification of the free type two-way clutch of the first invention of the present application. It is a structural diagram which shows the Example of the free type two-way clutch of 2nd invention of this application. It is a figure which shows the structure of the conventional free type two-way clutch.

  Hereinafter, the free type two-way clutch of the present invention will be described based on the drawings. FIG. 1 shows the entire structure of the embodiment of the free type two-way clutch according to the first invention of the present application, and the operation thereof is shown in FIGS. 2 to 4. 5 and 6 show the main components of the free type two-way clutch of the first invention of the present application in a single state.

The free type two-way clutch shown in FIG. 1 comprises a housing 1 fixed in a circular cross section, and an input shaft 2 and an output shaft 3 rotatable around a common rotation axis (central axis) o within the housing 1 Have.
Referring to FIG. 5 in conjunction with FIG. 1, the housing 1 is a cup-shaped member comprising a circumferential wall 11 and an annular end plate 12, the central axes of which are the rotation of the input shaft 2 and the output shaft 3. It is identical to the axis o. Three radially outwardly projecting ears 13 are provided on the outer peripheral surface of the circumferential wall 11 at equal angular intervals in the circumferential direction, and the axially extending through holes 14 are formed in the ears 13. It is formed. On the other hand, a disk-like shield body 15 for closing the inside is disposed on the opening side end face of the circumferential wall portion 11, and the shield body 15 is fixed to the circumferential wall portion 11 by a suitable fixing tool such as a bolt.

Referring to FIG. 6 together with FIG. 1, the input shaft 2 is a cylindrical input fixed to the center of one end face of the disk-shaped input flange portion 21 and the input flange portion 21 and having a relatively large diameter. A shaft portion 22 and a cylindrical convex portion 23 fixed to the center of the other end surface of the input flange portion 21 and having a relatively small diameter are provided. In the outer peripheral edge portion of the input flange portion 21, a plurality of space portions 24, four in the illustrated embodiment, are provided at equal angular intervals in the circumferential direction. The radially outer edge 25 of the space portion 24 has a one-side portion 25 a that extends inclining radially inward toward one circumferential direction and an other-side portion 25 b that extends radially inward toward the other circumferential side. And contains. In the illustrated embodiment, the one side portion 25a and the other side portion 25b are both linear and symmetrical with respect to a straight line extending radially between the two, and the one side portion 25a and the other side portion 25b. Are connected by a linear connection portion 25c. The circumferential side ends of the outer edge 25 are mutually connected by the radially inward convex inner surface 26 of a circular arc shape.

  Referring to FIG. 5 with reference to FIG. 1, the output shaft 3 includes a disc-shaped output flange portion 31, a sun gear 32 fixed to the center of one end face of the output flange portion 31, and the output flange portion 31. And a cylindrical output shaft portion 33 fixed to the center of the other end surface. A ring-shaped notch 34 is formed on the outer peripheral edge of one side surface of the output flange portion 31 (the surface on which the sun gear 32 is fixed). At the center of the sun gear 32, a recess 35 having a circular cross section is formed. As will be described later, the convex portion 23 of the input shaft 2 is rotatably fitted to the concave portion 35 so as to be rotatable relative to the common central axis o, thereby causing misalignment when the input shaft 2 and the output shaft 3 rotate. Is prevented.

  Continuing with reference to FIG. 6 together with FIG. 1, a planetary gear body having a planetary gear 41 meshing with the sun gear 32 of the output shaft 3 inside the housing 1 as shown in the central longitudinal sectional view of FIG. Four are arranged. A plurality of planetary gear bodies 4 are provided at equal angular intervals in the circumferential direction, four in the illustrated embodiment. A projecting portion 42 that protrudes in the axial direction and has a circular cross-sectional shape is fixed to the planetary gear 4, and central axes of the projecting portion 42 and the planetary gear 41 are the same. In the illustrated embodiment, an axial hole 43 is formed at the center of the planetary gear 4 so as to extend in the entire axial direction, whereby the projection 42 has a cylindrical shape.

  Further, inside the housing 1, a carrier 5 rotatably supporting a planetary gear 4 and rotatable around a common central axis o is disposed. The carrier 5 has an annular substrate portion 51, a cylindrical wall 52 extending in the axial direction at the outer peripheral edge of the substrate portion 51, and a carrier shaft 53 having a circular cross section extending in the axial direction at a substantially intermediate position in the radial direction of the substrate portion 51 And have. At the axially extending end of the cylindrical wall 52, four rectangular notches 54 are formed at equal angular intervals in the circumferential direction. A plurality of carrier shafts 53 are provided at equal angular intervals in the circumferential direction, four in the illustrated embodiment, and the extension ends of the cylindrical walls 52 are formed with notches 54 (notches 54 are formed). In the axial direction. An annular carrier auxiliary plate 55 is integrally coupled to the carrier 5. By integrally coupling the carrier auxiliary plate 55 to the carrier 5, as described later, the planetary gear body 4 is sandwiched between the substrate portion 51 and the carrier auxiliary plate 55 in the axial direction. The axial movement of the planetary gear 4 is restricted, and the planetary gear 4 can stably rotate around the carrier shaft 53. The carrier auxiliary plate 55 is formed with a claw 56 and a hole 57 that fit the carrier shaft 53 and the notch 54.

The free type two-way clutch shown in FIG. 1 is combined as follows.
First, the output shaft portion 33 of the output shaft 3 is inserted into the end plate portion 12 of the housing 1, and the output shaft 3 is disposed inside the housing 1. Then, the carrier 5 is disposed inside the housing 1 such that the opening located at the center of the carrier 5 surrounds the sun gear 32 of the output shaft 3. At this time, prior to placing the carrier 5 inside the housing 1, a spring 6 for applying a predetermined frictional force between the output shaft 3 and the carrier 5 is placed in the notch 34 of the output shaft 3. Keep it. The spring 6 is preferably a wave spring. By ne 6 words, a predetermined frictional force is applied between the output flange 31 and the substrate portion 51. Next, the planetary gear 41 of the planetary gear 4 and the sun gear 32 of the output shaft 3 are engaged, and the shaft hole 43 of the planetary gear 4 is inserted through the carrier shaft 53 of the carrier 5. The carrier shaft 53 of the carrier 5 is pivotally supported. After that, the input shaft 2 is disposed inside the housing 1 so that the protrusion 42 is inserted into the space 24 of the input shaft 2 together with the carrier shaft 53. At this time, the projecting portion 42 has an outer edge 25 in the space portion 24, i.e. one side straight portion 25a and the other side straight portion 25b and the connecting portion 25c, respectively, and the proximity to good to abut, spaced from the inner edge 26 Do. Thereafter, the carrier auxiliary plate 55 is integrally coupled to the carrier 5 at a position facing the planet gear body 4 and the inside of the housing 1 is closed by the shield body 15.

Subsequently, the operation of the free type two-way clutch shown in FIG. 1 will be described with reference to FIGS. 2 to 4.
As shown by the arrows in FIG. 2, when the input shaft 2 is rotated clockwise (as viewed from the right of the central longitudinal sectional view) by the motor of the drive source, it is formed on the input flange portion 21 of the input shaft 2 The space 24 moves clockwise. At this time, biting occurs between the outer edge 25 of the space 24, more specifically the one-side straight portion 25a, and the protrusion 42, and rotation of the planetary gear 4 is prevented. When the input shaft 2 is further rotated from this state, the sun gear 32 meshing with the planetary gear 41 of the planetary gear 4 is integrated with the input flange portion 21 together with the planetary gear 4 and the carrier 5 supporting the same. And rotate. That is, the output shaft 3 rotates integrally with the input shaft 2. At this time, in the present embodiment, in the space portion 24, since the protruding portion 42 is close to or in contact with the outer edge 25, cause with the eating only space 24 is slightly moved, the input shaft Delay of rotation from 2 to the output shaft 3, so-called backlash does not occur. When the input shaft 2 is rotated in the counterclockwise direction, the input shaft 2 is rotated in the clockwise direction except that the other linear portion 25 b of the space 24 and the protrusion 42 cause bite . Since this is the same as the case, detailed description will be omitted.

On the other hand, as shown in FIG. 3, the clockwise rotation of the input shaft 2 is stopped, and biting occurs between the one-side straight portion 25a of the outer edge 25 of the space 24 and the protrusion 42. When the output shaft 3 is rotated clockwise (as viewed from the right in the central longitudinal sectional view) as indicated by the arrow, the sun gear 32 of the output shaft 3 counterclockwise rotates the planetary gear 41 meshing therewith. It tries to rotate in the direction, so that the projection 42 also tries to rotate counterclockwise in the space 24. However, the direction of rotation of the projection 42 is a tangential component of the projection 42 at the part where the biting occurs, that is, a component including the one-side straight portion 25 a of the outer edge 25 constituting the space 24. to in the virtual wedge space W (showing a part of the outer edge by a two-dot chain line C part enlarged view of FIG. 3), which attempts to rotate the wide side of the narrow side, which is with the eating Is the direction in which On the other hand, a spring 6 for applying a predetermined frictional force is disposed between the output shaft 3 and the carrier 5, and when the output shaft 3 is rotated as described above, one of the rotations of the output shaft 3 is caused by the frictional force. The part is transmitted to the carrier 5, and the planet gear 4 supported on the carrier 5 along with the carrier 5 is also slightly moved clockwise as indicated by the small arrow. As a result, the protrusion 42 provided on the planetary gear 4 also slightly moves in the clockwise direction. The movement direction of the projection 42 is a direction away from the one-side straight portion 25 a in the space 24, that is, a direction in which the biting is released. From this, the protrusion 42 moves in the direction in which the biting is released simultaneously with the rotation in the direction in which the biting occurs with the one-side straight portion 25 a of the outer edge 25 of the space 24. As a result, the space portion 24 can be rotated without any bite . Therefore, even if the output shaft 3 rotates in the clockwise direction, the planetary gear 4 rotates only to idle, and power transmission is interrupted.

On the other hand, as shown in FIG. 4, the clockwise rotation of the input shaft 2 is stopped, and biting is occurring between the one-side straight portion 25 a of the outer edge 25 of the space 24 and the protrusion 42. When the output shaft 3 is rotated in the counterclockwise direction (as viewed from the right in the central longitudinal cross-sectional view) as indicated by the arrow, the carrier 5 and the planetary gear 4 axially supported by the carrier have the above-mentioned friction due to the spring 6 The force moves slightly counterclockwise as a small arrow. As a result, the protrusion 42 provided on the planetary gear 4 also slightly moves in the counterclockwise direction. The movement direction of the projection 42 is a direction in which the one-side straight portion 25 a approaches the space 24, that is, a direction in which the above-mentioned biting occurs. On the other hand, the sun gear 32 of the output shaft 3 tries to rotate the planetary gear 41 meshing with it in the clockwise direction, whereby the projection 42 also tries to rotate in the space 24 in the clockwise direction. The direction of rotation of the protrusion 42 is intended to rotate from the narrow side to the wide side in the virtual weir space W described above, which is the direction to release the biting . From this, the protrusion 42 is generally moved in the direction in which it bites with the one-side straight portion 25a of the outer edge 25 of the space 24, and at the same time in the direction in which the biting is released. As it rotates, as a result, it becomes possible to rotate without causing any bite in the space 24. Therefore, even if the output shaft 3 rotates in the counterclockwise direction, the planetary gear 4 rotates only to idle, and power transmission is interrupted.

  As described above, in the free type two-way clutch of the present invention, the planetary gear body is maintained while the stop position in the state where the clockwise rotation of the input shaft 2 is stopped is maintained even when the output shaft 3 rotates in either direction. The rotation transmission to the input shaft 2 can be cut off by rotating 4 (slip). Since the space portion 24 of the input shaft 2 has a line-symmetrical shape, the rotation transmission from the output shaft 3 to the input shaft 2 is interrupted in the same operation even when the counterclockwise rotation of the input shaft 2 is stopped. It is obvious that

  In the modification of the first invention of the present application shown in FIG. 7, the rolling element 7 for reducing the frictional force is disposed between the output shaft 3 and the housing 1. In the present embodiment, the rolling element 7 is disposed in a recess provided at the center of the end plate 12 in the housing 1 to reduce the frictional force between the end plate 12 and the output flange 31. ing. By disposing the rolling element 7, the frictional force between the output shaft 3 and the carrier 5 is sufficiently larger than the frictional force between the output shaft 3 and the housing 1 and becomes dominant. As a result, when the output shaft 3 rotates with the input shaft 2 stopped, a part of the rotation is reliably transmitted to the carrier 5 instead of the housing 1.

  Furthermore, in the embodiment shown in FIG. 7, the rolling elements 8 are disposed also between the shield 15 and the carrier auxiliary plate 55, and the frictional force between them is also reduced. Thereby, between the housing 1 and the output shaft 3 (the end plate 12 and the output flange 31) in the axial direction, between the output shaft 3 and the carrier 5 (the output flange 31 and the base end 51), the carrier The friction between the output shaft 3 and the carrier 5 is most dominant in the friction between the housing 5 (the carrier auxiliary plate 55 and the shield 15). As a result, when the output shaft 3 rotates in a state where the input shaft 2 is stopped, a part of the rotation is more reliably transmitted by the carrier 5.

  Subsequently, the second invention of the present application will be described with reference to FIG. In the free type two-way clutch of the second invention of the present application, the space portion in the first invention described above is a space portion that extends inclining radially inward toward one circumferential direction and a diameter toward the other circumferential direction Spaces extending inward in the direction are replaced by pairs of space portions, and projections are inserted into each of the pair of space portions. Therefore, in the following, only the space portion which is a difference portion from the first invention of the present application will be described in detail, and the description of the other configuration which is the same portion will be omitted. At this time, the same parts as those of the free type two-way clutch according to the first invention of the present application will be indicated by adding "'(dash)" to the numbers.

Space portions 24a 'and 24b' forming a pair are provided at the outer peripheral edge portion of the input flange portion 21 'fixed to the input shaft 2' in the present embodiment. In the illustrated embodiment, three pairs of space portions 24a 'and 24b' are provided, and one of the pair of space portions 24a 'and the other 24b' are alternately arranged at equal angular intervals in the circumferential direction. (That is, each of the pair of space portions 24a 'and 24b' is disposed adjacent to each other in the circumferential direction) . The outer edge 25a 'of one of the pair of spaces 24a' extends radially inwardly in an arc shape toward one side in the circumferential direction, and the outer edge 25b 'of the other 24b' of the pair is in the circumferential direction and the other Extending radially inwards and arcing in an arc towards the side, the outer edge 25a 'and the outer edge 25b' are line symmetrical with respect to a straight line extending radially between the two . Each of the pair of space portions 24a 'and 24b' is formed through the input flange portion 21 '. On the other hand, inside the housing 1 ', a planetary gear body 4' having a planetary gear 41 'meshing with the sun gear 32' is disposed. The projection 42 'of the planetary gear 4' is inserted into each of the pair of spaces 24a 'and 24b', and within one 24a 'of the pair of spaces, the outer edge 25a' is paired with the outer edge 25a '. In the other 24b ', they approach or abut against the outer edge 25b', respectively.

Then, when the input shaft 2 'is driven to rotate clockwise (as viewed from the right in the central longitudinal sectional view), the outer edge 25a' and the protrusion 42 'are formed in one of the pair of space portions 24a'. biting occurs between (this time, no biting in other 24b' space portion forming a pair) is blocked rotation of the planetary gear body 4 ', the sun gear 32' planetary gear body 4 'and It rotates integrally with the carrier 5 '. When the input shaft 2 'is driven to rotate counterclockwise (as viewed from the right in the central longitudinal cross-sectional view), the outer edge 25b' and the projection 42 'are formed in the other 24b' of the space part of the pair of space parts. biting occurs between the exception of (this time, resulting not biting in one 24a' space portion forming a pair) that is the same as when the input shaft 2 'rotates clockwise .

Rotated clockwise stops of the input shaft 2 'at one 24a' space portion forming a pair, with the bite between the outer edges 25a' and the projection 42' has occurred, the output shaft 3 When 'is driven to rotate clockwise, although illustration is omitted, it operates as follows. That is, in one of the pair of space portions 24a ', the protrusion 42' rotates in the direction in which biting occurs with the outer edge 25a ', but generally in the direction in which the biting is released. There is no bite between it and the outer edge 25a '(the " bite " between the projection 42' and the outer edge 25a 'is the first invention of the present application described above. The same applies to the case where the output shaft 3 'which will be described later rotates counterclockwise). On the other hand, in the other space 24b 'of the pair of spaces, the projection 42' slightly moves in the direction in which biting occurs with the outer edge 25b ', but such biting is released. Therefore, no biting occurs with the outer edge 25b '. From the above, even if the output shaft 3 'is rotated in the clockwise direction, the planetary gear 4' only spins and idles, and power transmission is interrupted.

On the other hand, rotationally driven in the clockwise direction is stopped the input shaft 2 'at one 24a' space portion forming a pair, with the bite between the outer edges 25a' and the projection 42' has occurred, the output When the shaft 3 'is rotated counterclockwise, although illustration is omitted, it operates as follows. That is, in one of the pair of space portions 24a ', the projection 42' slightly moves in the direction to cause biting with the outer edge 25a ', but such biting is released. Therefore, no biting occurs with the outer edge 25a '. On the other hand, on the other hand 24b' of space the paired protrusion 42 'is rotates in a direction causing bite between the outer edge 25B', slightly in the direction with such bite is released moved Therefore, no biting occurs with the outer edge 25b '. From the above, even if the output shaft 3 'is driven and rotated counterclockwise, the planetary gear 4' only spins and idles, and power transmission is interrupted.

As described above in detail, in the free type two-way clutch of the present invention, the sun gear is provided on the output shaft and a space is provided on the input shaft, and the projection of the planetary gear is inserted into this space. When the input shaft is driven to rotate, the rotation of the planetary gear body is blocked and locked, and the rotation is transmitted to the output shaft, while when the output shaft is driven to rotate, the input shaft holds the stop position In this condition, the output shaft is idled. It is obvious that various modifications can be made to the above embodiment etc., for example, by appropriately changing the number of installation of the planetary gear body and the space portion.

1: Housing 2: Input shaft 24: Space portion 25: Outer edge 3: Output shaft 32: Sun gear 34: Notched 4: Planetary gear body 41: Planet gear 42: Protrusive portion 5: Carrier 53: Carrier shaft 6: Spring

Claims (8)

A non-rotatable housing, and an input shaft and an output shaft rotatable around a common central axis in the housing, and forward and reverse rotations from the input shaft are transmitted to the output shaft, The transmission of rotation from the output shaft to the input shaft is a free type two-way clutch in which the output shaft is disengaged and disconnected.
A sun gear is fixed to the output shaft, and a planetary gear body having a planetary gear meshing with the sun gear is rotatably supported inside the housing, and the planetary gear body is rotatably supported around the common central axis. A rotatable carrier, and a spring for applying a predetermined frictional force between the output shaft and the carrier;
The planetary gear body is provided with a projecting portion that protrudes in the axial direction and has a circular cross-sectional shape, and the input shaft is provided with a space portion into which the protruding portion is inserted, in the space portion The radially outer edge includes one side extending obliquely inward in the radial direction toward one side in the circumferential direction and the other side extending inward in the radial direction toward the other side in the circumferential direction ,
When the input shaft is driven to rotate, biting occurs between the outer edge of the space and the projection, rotation of the planetary gear is prevented, and the sun gear is the planetary gear and the planetary gear. A free type characterized in that when the output shaft is driven and rotated, rotation of the planetary gear body is permitted and transmission of rotation to the input shaft is interrupted, while integrally rotating with the carrier Bidirectional clutch. Wherein the outer edge the side portion and the other side portion of a line symmetrical with respect to a straight line extending through both of the intermediate radially free type bidirectional clutch according to claim 1. A non-rotatable housing, and an input shaft and an output shaft rotatable around a common central axis in the housing, and forward and reverse rotations from the input shaft are transmitted to the output shaft, The transmission of rotation from the output shaft to the input shaft is a free type two-way clutch in which the output shaft is disengaged and disconnected.
A sun gear is fixed to the output shaft, and a plurality of planet gear bodies having planet gears meshing with the sun gear are rotatably supported inside the housing, and the planet gear bodies are rotatably supported and the common central axis A carrier rotatable around the first and second springs, and a spring for applying a predetermined frictional force between the output shaft and the carrier;
The planetary gear body is provided with a projecting portion projecting in the axial direction and having a circular cross-sectional shape, and the input shaft is provided with a pair of space portions into which the projecting portions of the planetary gear body are respectively inserted. And each of the pair of space portions is disposed circumferentially adjacent to each other, and one outer edge of the pair of space portions extends radially inward toward one circumferential side, and The outer edge of the rim extends radially inward toward the other side in the circumferential direction,
When the input shaft is driven to rotate, biting is caused between the outer edge and the projecting portion in one of the pair of space portions, rotation of the planetary gear is prevented, and the sun gear is rotated. Is integrally rotated with the planetary gear body, and when the output shaft is driven and rotated, rotation of the planetary gear body is permitted, and transmission of rotation to the input shaft is interrupted. Free type bi-directional clutch. The outer edges of each of the pair of spaces are both straight, and the outer edge of each of the pairs of spaces is axisymmetrical to a straight line extending radially between the two . The free type two-way clutch according to claim 3 . The free type two-way clutch according to any one of claims 1 to 4 , wherein the spring is a wave spring. The free space according to any one of claims 1 to 5 , wherein the input shaft and the output shaft are respectively formed with a concave portion and a convex portion rotatably fitted with each other coaxially with the common central axis. Type bi-directional clutch. The free type two-way clutch according to any one of claims 1 to 6 , wherein a rolling element for reducing friction is disposed between the output shaft and the housing. The free type two-way clutch according to any one of claims 1 to 7 , wherein a carrier auxiliary plate is integrally coupled to the carrier at a position opposite to each other with the planetary gear interposed therebetween.