JP2023032771A - Clutch mechanism, and driving device including clutch mechanism - Google Patents

Abstract

To provide a clutch mechanism capable of surely transferring from a driving force transmittable state to a driving force transmission cutoff state.SOLUTION: A clutch mechanism CM of the present invention includes: an engagement member 8 engageable with a transmission member 5; an energization member 9 for energizing the engagement member 8 along an energization direction BD from an engagement position to an engagement release position; a moving member 10 disposed at a side of the energization direction BD to the engagement member 8; a wall portion 11 having a through hole 11a; and an actuator 12 connected to a moving member-side connecting portion 10e of the moving member 10 via the through hole 11a and moving the moving member 10 between an engagement auxiliary position and an engagement release auxiliary position. The wall portion 11 is provided with a stop portion 14 for stopping the movement of the moving member 10 by being directly or indirectly kept into contact with the moving member 10 at a position where the moving member 10 is not kept into contact with a peripheral wall of the through hole 11a when the moving member 10 is moved from the engagement auxiliary position toward the engagement release auxiliary position.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a clutch mechanism and a drive device having the clutch mechanism.

2. Description of the Related Art Conventionally, in a driving device that transmits a driving force from a driving unit to a driven object, there are a driving force transmission enabled state in which the driving force can be transmitted to the driven object and a driving force transmission interrupted state in which the transmission of the driving force to the driven object is interrupted. For example, a clutch mechanism disclosed in Patent Document 1 is used to switch between. In this clutch mechanism, in the driving force transmission possible state, the clutch pin rotated by the driving force of the driving portion is inserted in the axial direction of the transmission gear through a through hole provided in the transmission gear for transmitting the driving force to the driven object, Engagement with the transmission gear in a direction around the axis of the transmission gear rotates the transmission gear. In addition, when the transmission of the driving force is interrupted, the clutch pin is extracted from the through hole of the transmission gear, so that the engagement between the clutch pin and the transmission gear is released, and the transmission gear can rotate independently. .

More specifically, the clutch mechanism of Patent Document 1 includes a transmission gear for transmitting a driving force to a driven object, and a drive section that rotates and rotates around an axis while moving toward or toward the transmission gear. a clutch pin axially movable away from the transmission gear; a biasing member for biasing the clutch pin axially away from the transmission gear; and a clutch lever that is rotatably movable about an axis. The clutch lever is connected to the solenoid arm via a through hole that communicates the inside and outside of the housing. The clutch lever rotates about its axis by activating and deactivating the solenoid. When the clutch lever is rotated in one direction around the shaft by the actuation of the solenoid, the clutch lever is positioned on an inclined sliding surface protruding from the wall of the housing and an inclined sliding surface protruding from the wall of the housing. A sliding surface provided on the clutch lever interacts in sliding engagement with the clutch pin to move the clutch pin axially toward the transmission gear against the biasing force of the biasing member, thereby displacing the transmission gear and the clutch pin. Engage. Further, when the clutch lever rotates in the other direction around the shaft, it moves away from the transmission gear together with the clutch pin by the biasing force of the biasing member, and the engagement between the transmission gear and the clutch pin is released.

Here, the driving device equipped with the clutch mechanism disclosed in Patent Document 1 is used as a winch device for pulling a wheelchair. In this winch device, the drive force is transmitted to the transmission gear by engaging the clutch pin with the transmission gear, and by operating the drive unit in the drive force transmittable state, the drive force is transmitted. The wheelchair can be towed by being able to be transmitted to the wheelchair. Further, when an operation is performed to shift from the driving force transmittable state to the driving force transmission interrupted state in which transmission of the driving force to the transmission gear is interrupted, the clutch pin is disengaged from the transmission gear. When the solenoid is released, the solenoid arm operates to rotate the clutch lever and the clutch pin about the axis, and move away from the transmission gear by the biasing force of the biasing member.

Japanese Patent Application Laid-Open No. 2021-4135

However, for example, when the wheelchair is towed and the towing is released, the load from the transmission gear remains on the clutch pin, that is, the clutch pin firmly engages the transmission gear in the axial direction. In this state, the clutch lever and clutch pin may not be able to move away from the transmission gear due to the biasing force of the biasing member. As a result, the connecting portion of the clutch lever with the solenoid arm passes through the through hole of the housing and cannot return to the normal axial position exposed to the outside of the housing. . If the connecting portion of the clutch lever slips under the wall portion of the housing, even if the load applied to the clutch pin from the transmission gear is subsequently reduced, the wall portion of the housing acts as a barrier to prevent the clutch lever and the clutch from moving. The pin cannot return to its normal axial position and no transition to the drive transmission cutoff state occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a clutch mechanism and a drive device having such a clutch mechanism, which can more reliably shift from a driving force transmission enabled state to a driving force transmission cutoff state.

A clutch mechanism according to the present invention is a driving device that transmits a driving force from a driving portion to a driven object, and includes: a driving force transmissible state in which a transmission member can transmit the driving force to the driven object; A clutch mechanism for switching between a driving force transmission interrupted state for interrupting transmission of the driving force to An engagement position movable between an engagement position in which the transmission member is in the driving force transmission enabled state and an engagement release position in which the transmission member is disengaged from the transmission member and in the driving force transmission cutoff state. an engaging member; a biasing member that biases the engaging member from the engaging position to the disengaged position along the biasing direction; a moving member movable between an auxiliary engagement position for moving the engaging member to the engaging position and an auxiliary disengagement position for allowing movement of the engaging member to the disengagement position; a wall portion provided with a through hole disposed on the biasing direction side with respect to the moving member; an actuator for moving the moving member between the engagement assisting position and the engagement releasing assisting position, wherein the moving member side connecting portion is adapted to move the moving member when the moving member is at the disengaging assisting position; , the wall portion is arranged to at least partially enter the through hole, and the moving member is arranged in the wall portion to move the moving member from the engagement assisting position toward the disengagement assisting position. A stopping portion is provided at a position that does not contact the peripheral wall of the through hole, and stops the movement of the moving member by directly or indirectly coming into contact with the moving member.

The drive device of the present invention comprises a traction member, a winding member capable of winding and unwinding the traction member, a driving section for generating a driving force for rotating the winding member, and a drive unit for rotating the winding member. a transmission member that transmits force; a transmission mechanism that is arranged between the driving portion and the transmission member and transmits the driving force from the driving portion to the transmission member; and the clutch mechanism.

According to the present invention, it is possible to provide a clutch mechanism capable of more reliably shifting from a driving force transmission enabled state to a driving force transmission cutoff state, and a driving device provided with the clutch mechanism.

1 is a schematic diagram showing a state in which a driving device having a clutch mechanism according to an embodiment of the present invention is connected to a wheelchair; FIG. 1 is a perspective view of a driving device having a clutch mechanism according to one embodiment of the invention; FIG. FIG. 3 is a perspective view of the driving device of FIG. 2 as seen from the rear side; FIG. 3 is a perspective view showing a state in which a housing is removed from the driving device of FIG. 2; Figure 3 is an exploded perspective view of some components of the drive of Figure 2; 3 is a top view of a transmission member and ratchet mechanism of the drive device of FIG. 2; FIG. 3 is a top view of the transmission mechanism of the drive device of FIG. 2; FIG. Figure 3 is a perspective view of a moving member of the drive device of Figure 2; Figure 3 is a perspective view of an engagement member of the drive device of Figure 2; FIG. 3 is a perspective view of the housing of the driving device of FIG. 2 as seen from the rear side; FIG. 4 is an explanatory diagram illustrating a state in which a driving force can be transmitted by a clutch mechanism according to one embodiment of the present invention; 10B is a schematic top view of the clutch mechanism in the state of FIG. 10A; FIG. FIG. 4 is an explanatory diagram illustrating a drive force transmission cutoff state of a clutch mechanism according to one embodiment of the present invention; 11B is a schematic top view of the clutch mechanism in the state of FIG. 11A; FIG. FIG. 5 is an explanatory diagram illustrating the state of a clutch mechanism of a comparative example that does not have a stopping portion; 12B is a schematic top view of the clutch mechanism in the state of FIG. 12A; FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A clutch mechanism and a drive device provided with the clutch mechanism according to an embodiment of the present invention will be described below with reference to the accompanying drawings. However, the embodiments shown below are merely examples, and the clutch mechanism and the driving device of the present invention are not limited to the following embodiments. Moreover, the clutch mechanism of the present invention is not limited to the drive device described below, and can be applied to other drive devices.

A driving device 1 of the present embodiment is a device for towing a driven object such as a wheelchair WC, as shown in FIG. The drive device 1 is used, for example, as a winch device that is installed in a vehicle V and that pulls a wheelchair WC to be driven into the vehicle V. As shown in FIG. The wheelchair WC is towed by the driving device 1 and guided to the bed LP inside the vehicle V through the slope SL provided in the vehicle V. As shown in FIG. However, the drive device 1 is not limited to the wheelchair WC, and can also be used to tow other objects to be driven.

The driving device 1, as shown in FIGS. 2 to 4, generates a traction member 2, a winding member 3 capable of winding and unwinding the traction member 2, and a driving force for rotating the winding member 3. , a transmission member 5 (see FIG. 4) that transmits the driving force to the winding member 3, and the driving portion 4 is disposed between the driving portion 4 and the transmission member 5 so that the driving force is transmitted from the driving portion 4 to the transmission member 5. and a clutch mechanism CM. In the present embodiment, the drive device 1 includes a support member SM to which the winding member 3 is attached, and fixed to the support member SM to at least partially support the transmission mechanism TM, the clutch mechanism CM and the transmission member 5 together with the support member SM. and a housing H that accommodates the The driving device 1 transmits the driving force generated by the driving unit 4 to the winding member 3 via the transmission mechanism TM, the clutch mechanism CM, and the transmission member 5, and winds the pulling member 2 by the winding member 3. , tow the wheelchair WC to be driven.

The traction member 2 is an elongated member that pulls the wheelchair WC to be driven. The traction member 2, as shown in FIGS. 1 to 3, is connected at one end to the winding member 3 and at the other end to the wheelchair WC via, for example, a hook F or the like to provide a driving device. 1 and the wheelchair WC. The traction member 2 is not particularly limited as long as it has flexibility so that it can be wound around the winding member 3 and has strength enough to suppress breakage or the like when the wheelchair WC is towed. , ropes, wires and the like.

The winding member 3 is a member that winds up and feeds out the traction member 2 . As shown in FIGS. 2 to 4, the winding member 3 rotates about the axis X in one direction (hereinafter referred to as "first direction D1") to wind the traction member 2, thereby pulling the traction member. 2 is paid out to rotate in the other direction (hereinafter referred to as “second direction D2”). In the present embodiment, the winding member 3 is configured by rotatably fixing a rotating shaft member RS (see FIG. 5) fixed to the center of rotation to the opposing side walls SM1, SM1 of the supporting member SM, so that the opposing side walls It is rotatably mounted between SM1, SM1. Further, the winding member 3 is fixed to the transmission member 5 via the rotating shaft member RS so as to rotate about the axis X together with the transmission member 5 . In addition, hereinafter, the moving direction of other members that move in relation to the rotation of the winding member 3 in the first direction D1 is also referred to as the first direction D1, and the rotation of the winding member 3 in the second direction D2 is referred to as the first direction D1. The direction of movement of other members that move in relation to is also referred to as the second direction D2.

The driving unit 4 generates driving force for rotating the winding member 3 . The drive unit 4 is connected to the transmission mechanism TM so as to transmit driving force to the transmission mechanism TM, as shown in FIG. The drive unit 4 rotates the winding member 3 via the transmission mechanism TM, the clutch mechanism CM, and the transmission member 5 by transmitting the generated driving force to the transmission mechanism TM. The drive unit 4 is only required to generate driving force for rotating the winding member 3 and transmit the generated driving force to the transmission member 5 via the transmission mechanism TM and the clutch mechanism CM. It is not particularly limited. In this embodiment, as shown in FIG. 4, the drive unit 4 includes a motor 41, a worm gear unit 42 connected to the output shaft of the motor 41, a driving force transmission shaft 43 connected to the worm gear unit 42, and a driving force transmission gear 44 fixed to the driving force transmission shaft 43 and connected to the transmission mechanism TM. The worm gear portion 42 includes a worm (not shown) fixed to one of the output shaft of the motor 41 and the driving force transmission shaft 43, and a worm fixed to the other of the output shaft of the motor 41 and the driving force transmission shaft 43. wheels (not shown); The drive unit 4 operates the motor 41 to rotate the output shaft of the motor 41 , thereby rotating the driving force transmission shaft 43 and the driving force transmission gear 44 via the worm gear portion 42 . The drive unit 4 rotates the transmission mechanism TM by rotating the driving force transmission gear 44, and rotates the transmission member 5 via the transmission mechanism TM and the clutch mechanism CM.

The transmission member 5 is a member that transmits the driving force of the driving portion 4 to a driven object. In this embodiment, the transmission member 5 transmits the driving force of the drive unit 4 transmitted via the transmission mechanism TM and the clutch mechanism CM to the winding member 3, and drives the winding member 3 and the traction member 2. The driving force is transmitted to the target wheelchair WC. The configuration of the transmission member 5 is not particularly limited as long as it can transmit the driving force of the drive unit 4 to the object to be driven. In this embodiment, as shown in FIGS. 5 and 6, the transmission member 5 is connected to the winding member 3 via a rotating shaft member RS fixed to a fitting hole 51 provided at the center of rotation. It is configured to rotate around the axis X together with the winding member 3 . The transmission member 5 is rotatably fixed to the support member SM (see FIG. 4) together with the winding member 3 via its rotating shaft member RS. The transmission member 5 is embodied as a substantially circular ratchet gear having ratchet teeth RM1 on its outer circumference, and as described below, is configured so that its rotational movement is restricted in a predetermined state. However, the transmission member 5 is not limited to this embodiment as long as it can transmit a driving force to the winding member 3 so as to rotate the winding member 3. may be configured so that the rotational movement is not restricted, for example, the winding member 3 is provided with a pinion, and is embodied as a linear rack that moves linearly while engaging with the pinion. It may be configured to move.

As shown in FIG. 6, the transmission member 5 includes an engaged portion 52 that engages with an engaging member 8 of a clutch mechanism CM, which will be described later. The transmission member 5 engages the engagement member 8 of the clutch mechanism CM with the engaged portion 52 in the movement direction (the rotation direction in this embodiment) of the transmission member 5 . A driving force is transmitted from the transmission mechanism TM via the winding member 3, and the driving force can be transmitted to the driven object via the winding member 3. Further, when the engagement member 8 of the clutch mechanism CM is disengaged from the engaged portion 52, the transmission member 5 cuts off the transmission of the driving force from the transmission mechanism TM, and the transmission member 5 is transferred to the driven object. is interrupted.

The engaged portion 52 of the transmission member 5 may be engaged with the engaging member 8 of the clutch mechanism CM in the movement direction of the transmission member 5, and its configuration is not particularly limited. In the present embodiment, the engaged portion 52 is configured as a peripheral wall of a through hole 53 passing through the transmission member 5 along the axis X direction, as shown in FIG. 6 . The through hole 53 is sized to allow insertion of an engagement pin 82 (see FIGS. 5 and 8B) of the engagement member 8, which will be described later. The engagement pin 82 of the engagement member 8 is inserted into the through hole 53 , so that it can be engaged with the engaged portion 52 that is the peripheral wall of the through hole 53 . The transmission member 5 has a plurality of (six in this embodiment) spaced apart from each other along the moving direction (rotating direction in this embodiment) of the transmission member 5 corresponding to the engaging pin 82 of the engaging member 8 . through holes 53 are provided. A guide surface 54 for guiding the engagement pin 82 to the through hole 53 is provided on the surface of the transmission member 5 on the side of the engaging member 8 in the direction of the axis X, adjacent to the through hole 53 on the second direction D2 side. It is The guide surface 54 is slanted toward the side opposite to the side of the engagement member 8 in the direction of the axis X (the back side of the paper surface in FIG. 6) as it goes in the first direction D1. When the engagement pin 82 is moved in the first direction D1 while being pressed toward the transmission member 5 in the direction of the axis X, when the tip of the engagement pin 82 comes into contact with the guide surface 54, the guide surface 54 is displaced. The inclination promotes the movement of the engaging pin 82 in the first direction D<b>1 and facilitates the insertion into the through hole 53 .

As shown in FIGS. 4 to 6, the driving device 1 includes a ratchet mechanism RM that permits rotation of the transmission member 5 in the first direction D1 and restricts rotation of the transmission member 5 in the second direction D2. may be In the present embodiment, the ratchet mechanism RM has a first functional state (state shown in FIG. 6) that permits movement of the transmission member 5 in the first direction D1 and restricts movement of the transmission member 5 in the second direction D2. , and a second functional state (not shown) allowing movement of the transmission member 5 in the first and second directions D1, D2. When the ratchet mechanism RM is in the first functional state, when a driving force for moving the transmission member 5 in the first direction D1 is transmitted to the transmission member 5, the transmission member 5 moves in the first direction D1. is allowed, the winding member 3 rotates in the first direction D<b>1 together with the transmission member 5 to wind the pulling member 2 . Conversely, when the traction member 2 is about to be unwound from the winding member 3, the movement of the transmission member 5 in the second direction D2 is restricted, thereby restricting the rotation of the winding member 3 in the second direction D2. As a result, the extension of the traction member 2 is restricted. Further, when the ratchet mechanism RM is in the second functional state, the transmission member 5 is allowed to move in the first and second directions D1 and D2, thereby allowing the winding member 3 to rotate and towing. It becomes possible to extend the member 2 .

The configuration of the ratchet mechanism RM is not particularly limited as long as it can shift between the first functional state and the second functional state described above. In this embodiment, as shown in FIGS. 4 and 6, the ratchet mechanism RM includes ratchet teeth RM1 provided on the outer periphery of the transmission member 5, an engagement position where the ratchet teeth RM1 are engaged, and ratchet teeth RM1. a pawl member RM2 movable between a disengaged position and a disengaged position; a biasing member (not shown) that biases the pawl member RM2 from the disengaged position toward the engaged position; between a position of the first function state and a position of the second function state. The pawl member RM2 is rotatably supported by the side wall SM1 of the support member SM via a rotation shaft RM4 extending substantially parallel to the axis X. As shown in FIG. One end RM21 of the pawl member RM2 is connected to the ratchet mechanism actuator RM3, and the other end RM22 of the pawl member RM2 is engageable with the ratchet teeth RM1. The ratchet mechanism actuator RM3 is configured by a known solenoid in this embodiment. In the non-actuated state, the ratchet mechanism actuator RM3 positions the other end RM22 of the pawl member RM2 in a position adjacent to the ratchet tooth RM1 (the position in FIG. 6) to bring the pawl member RM2 into the first functional state. . Also, in the operating state, the ratchet mechanism actuator RM3 positions the other end portion RM22 of the pawl member RM2 at a position away from the ratchet teeth RM1 to place the pawl member RM2 in the second functional state. The pawl member RM2 is positioned adjacent to the ratchet tooth RM1 in the first functional state and is biased from the disengaged position toward the engaged position by the biasing member. At this time, when the transmission member 5 moves in the first direction D1, the ratchet tooth RM1 moves the other end RM22 of the pawl member RM2 to the disengaged position against the biasing force of the biasing member. Therefore, the movement of the transmission member 5 in the first direction D1 is permitted. On the other hand, when the transmission member 5 moves in the second direction D2, the other end RM22 of the pawl member RM2 is held at the engagement position and engages with the ratchet teeth RM1. Movement in direction D2 is restricted. Also, in the second functional state, the pawl member RM2 is arranged at a position spaced from the ratchet teeth RM1, and is always in a disengaged state regardless of the biasing force of the biasing member. Therefore, the movement of the transmission member 5 in the first and second directions D1, D2 is allowed. In the driving device 1, when the wheelchair WC to be driven is towed, the ratchet mechanism actuator RM3 is activated to allow the transmission member 5 to move in the first direction D1 and move in the second direction D2. A first functional state that restricts movement to Further, when the pulling member 2 is drawn out from the winding member 3, the ratchet mechanism actuator RM3 is brought into a non-operating state, thereby entering a second functional state in which movement of the transmission member 5 in the second direction D2 is permitted. be.

As shown in FIG. 4, the transmission mechanism TM is connected to the driving portion 4 to transmit the driving force of the driving portion 4, and is connected to the transmission member 5 via the clutch mechanism CM to transmit the driving force of the driving portion 4. to the transmission member 5. In this embodiment, as shown in FIG. 5, the transmission mechanism TM is pivotally supported by a rotating shaft member RS fixed to the winding member 3 and the transmission member 5, and configured to be rotatable about the axis X. there is As shown in FIG. 4, the transmission mechanism TM is arranged such that a row of teeth provided on the outer circumference of the transmission mechanism TM (peripheral gear 6) meshes with a row of teeth on the outer circumference of the driving force transmission gear 44 of the drive unit 4. , is connected to the drive unit 4 . The transmission mechanism TM is configured to rotate about the axis X with the rotation of the driving force transmission gear 44 of the drive unit 4 when the driving force transmission gear 44 rotates. Further, the transmission mechanism TM is connected to the transmission member 5 via the clutch mechanism CM. The transmission mechanism TM rotates about the axis X by receiving the driving force of the drive unit 4, and rotates the transmission member 5 about the axis X via the clutch mechanism CM. However, although the transmission mechanism TM is configured to rotate by the driving force of the driving portion 4 in the present embodiment, if the driving force of the driving portion 4 can be transmitted to the transmission member 5, the transmission mechanism TM can be applied to the present embodiment. Without limitation, for example, it may be configured as a linear rack that moves linearly and configured to move linearly.

The transmission mechanism TM is arranged between the driving portion 4 and the transmission member 5, and is not particularly limited as long as it can transmit the driving force of the driving portion 4 to the transmission member 5. In this embodiment, as shown in FIGS. 5 and 7, the transmission mechanism TM includes a substantially annular outer gear 6 rotatable about the axis X, and a radially inner side of the inner circumference of the outer gear 6. , and an inner peripheral gear 7 rotatable about the axis X. As described below, relative rotation of the outer peripheral gear 6 and the inner peripheral gear 7 with respect to the inner peripheral gear 7 in the first direction D1 is restricted, and relative rotation of the outer peripheral gear 6 in the second direction D2 is restricted. is configured to allow That is, the outer peripheral gear 6 rotates together with the inner peripheral gear 7 when rotating in the first direction D1, and is rotatable relative to the inner peripheral gear 7 when rotating in the second direction D2.

The outer peripheral gear 6 is a gear connected to the driving portion 4 and to which the driving force is transmitted from the driving portion 4 . The outer gear 6 is rotatably supported by the rotary shaft member RS via an inner gear 7, as shown in FIG. As shown in FIG. 4, the outer circumference of the outer peripheral gear 6 is provided with a row of teeth that can mesh with the row of teeth of the driving force transmission gear 44 of the drive unit 4 . The outer peripheral gear 6 meshes with the driving force transmission gear 44 so as to rotate together with the rotation of the driving force transmission gear 44 . Further, the outer peripheral gear 6 is provided with a pawl member 61 that can be engaged with the inner peripheral gear 7, as shown in FIG. The pawl member 61 is configured to be movable between a position that protrudes radially inward from the inner peripheral surface of the outer peripheral gear 6 (the position in FIG. 7) and a position that is radially outer than the inner peripheral surface of the outer peripheral gear 6. It is Furthermore, the outer peripheral gear 6 is provided with a biasing member 62 that biases the pawl member 61 in a direction protruding radially inward from the inner peripheral surface of the outer peripheral gear 6 . Corresponding to the pawl member 61 of the outer peripheral gear 6 , the inner peripheral gear 7 is formed with a concave portion 71 recessed radially inward from the outer periphery of the inner peripheral gear 7 . The recessed portion 71 is formed such that a pawl member 61 protruding radially inward from the inner peripheral surface of the outer peripheral gear 6 is engaged with a side wall of the recessed portion 71 on the first direction D1 side. When the outer peripheral gear 6 rotates in the first direction D1, the pawl member 61 protruded radially inward from the inner periphery of the outer peripheral gear 6 by being biased by the biasing member 62 pushes the concave portion 71 of the inner peripheral gear 7 in the first direction. Engaging with the side wall on the D1 side, the inner peripheral gear 7 rotates together with the outer peripheral gear 6 . When the outer peripheral gear 6 rotates in the second direction D2, the pawl member 61 of the outer peripheral gear 6 is pressed by the side wall of the recess 71 of the inner peripheral gear 7 on the second direction D2 side, and the biasing force of the biasing member 62 is applied. Since the engagement with the inner peripheral gear 7 is released by moving to a position radially outer than the inner peripheral surface of the outer peripheral gear 6 , the outer peripheral gear 6 is moved relative to the inner peripheral gear 7 . rotatable.

The inner peripheral gear 7 is arranged radially inside the inner periphery of the outer peripheral gear 6 and supports the outer peripheral gear 6 . As shown in FIGS. 5 and 7, the inner peripheral gear 7 is rotatable about the axis X by inserting the rotating shaft member RS through an insertion hole 72 provided substantially at the center. pivoted on. In addition, as shown in FIG. 7, the inner peripheral gear 7 includes an engaged portion 73 that engages with an engaging member 8 of a clutch mechanism CM, which will be described later. In the transmission mechanism TM, the engaging member 8 of the clutch mechanism CM engages with the engaged portion 73 of the inner peripheral gear 7 in the movement direction (rotational direction in this embodiment) of the transmission mechanism TM, whereby the clutch mechanism CM The driving force of the driving portion 4 is transmitted to the engaging member 8 . The engaged portion 73 of the inner peripheral gear 7 may be engaged with the engaging member 8 of the clutch mechanism CM in the movement direction of the inner peripheral gear 7, and its configuration is not particularly limited. In this embodiment, as shown in FIG. 7, the engaged portion 73 is configured as a peripheral wall of a through hole 74 passing through the inner peripheral gear 7 in the axial X direction. The through hole 74 is formed to have a size through which an engagement pin 82 of the engagement member 8, which will be described later, can pass. The engaging pin 82 of the engaging member 8 is inserted through the through hole 74 so that it can be engaged with the engaged portion 73 that is the peripheral wall of the through hole 74 . The inner peripheral gear 7 has a plurality of (6 in this embodiment) spaced apart from each other along the moving direction (rotating direction in this embodiment) of the inner peripheral gear 7 corresponding to the engaging pin 82 of the engaging member 8 . ) through holes 74 are provided.

In the drive device 1, the clutch mechanism CM is in a driving force transmissible state (states shown in FIGS. 10A and 10B) in which the transmission member 5 can transmit the driving force to the driven object, and a state in which the transmission member 5 can transmit the driving force to the driven object. It is used to switch between the driving force transmission cutoff state (the state of FIGS. 11A and 11B) that cuts off the transmission. In this embodiment, when the driving device 1 is set to a state in which the driving force can be transmitted, the driving force is transmitted from the driving portion 4 to the transmission member 5 , and the driving force transmitted from the transmission member 5 is applied to the winding member 3 . The traction member 2 is wound up and the wheelchair WC to be driven is pulled by the traction member 2 . Further, since the driving device 1 is placed in the driving force transmission interrupted state, the driving force is not transmitted to the transmission member 5, and the driving force is transmitted from the transmission member 5 to the winding member 3 and the wheelchair WC. The wheelchair WC will not be towed without it. It should be noted that the clutch mechanism CM is not limited to the drive device 1 of the present embodiment, and can be applied to other drive devices that transmit drive force from a drive section to a drive target.

For the purpose of switching between the driving force transmission enabled state and the driving force transmission blocked state in the drive device 1, the clutch mechanism CM includes an engagement member 8 that can be engaged with the transmission member 5, as shown in FIG. , a biasing member 9 biasing the engaging member 8, a moving member 10 disposed on the side of the biasing direction BD with respect to the engaging member 8, and a side of the biasing direction BD with respect to the moving member 10. It has a wall portion 11 arranged thereon and an actuator 12 for moving the moving member 10 . As will be described in detail below, the clutch mechanism CM causes the actuator 12 to move the moving member 10 to a predetermined position, thereby engaging the engaging member 8 with the transmission member 5 against the biasing force of the biasing member 9 . The driving device 1 is moved to a position where it can be mated, and the driving force transmission is enabled. In addition, the clutch mechanism CM moves the moving member 10 to another predetermined position by the actuator 12 , so that the engaging member 8 is moved to a position where the engagement with the transmission member 5 can be released by the biasing force of the biasing member 9 . , and the driving device 1 is placed in the driving force transmission cutoff state.

The engagement member 8 has two positions: an engagement position (position shown in FIG. 10A ) where the transmission member 5 is engaged with the transmission member 5 so that the transmission member 5 can transmit driving force, and a position shown in FIG. It is configured to be movable between an engagement disengagement position (position in FIG. 11A) in which transmission of driving force is interrupted. The engaging member 8 transmits the driving force of the drive unit 4 to the transmission member 5 by engaging with the transmission member 5 at the engagement position, and disengages with the transmission member 5 at the disengagement position to transmit the drive unit 5 to the transmission member 5 . The transmission of the driving force of 4 to the transmission member 5 is interrupted. The moving direction of the engaging member 8 is not particularly limited as long as it can move between the engaging position and the disengaged position. In this embodiment, the engagement member 8 is configured to move along the axis X and move along the axis X in a direction toward the transmission member 5 to transmit the transmission, as shown in FIGS. 10A and 11A. It is configured to engage the member 5 and move away from the transmission member 5 along the axis X to disengage the transmission member 5 .

The structure of the engaging member 8 is not particularly limited as long as it can be engaged with the transmission member 5 when it is in the engagement position and can be disengaged with the transmission member 5 when it is in the disengagement position. In this embodiment, as shown in FIG. 8B, the engaging member 8 includes a base portion 81 and a plurality of (six in this embodiment) engaging members extending from the base portion 81 along the axis X in a direction approaching the transmission member 5 . A dowel pin 82 is provided. The base portion 81 is formed in a substantially disc shape extending in a plane substantially perpendicular to the axis X, and is provided with an insertion hole 81a through which the rotating shaft member RS is inserted at substantially the center thereof. The engaging member 8 is pivotally supported by the rotating shaft member RS so as to be movable along the axis X and rotatable about the axis X by inserting the rotating shaft member RS through the insertion hole 81 a of the base portion 81 . be. A plurality of engaging pins 82 are provided around the insertion hole 81a of the base portion 81 along the circumferential direction about the axis X at substantially equal intervals. The engaging pin 82 is formed in the shape of a rod extending along the axis X, and an engaging portion 82a that can be engaged with the engaged portion 52 of the transmission member 5 is formed on the side surface of the engaging pin 82 . As shown in FIG. 10A, by moving the engaging member 8 along the axis X in a direction approaching the transmission member 5, the engaging pin 82 is inserted into the through hole 53 of the transmission member 5, and the engaging member 8 engages with the engaged portion 52 of the transmission member 5 . Further, as shown in FIG. 11A , the engagement member 8 moves along the axis X in the direction away from the transmission member 5 , thereby extracting the engagement pin 82 from the through hole 53 of the transmission member 5 . The engagement between the engaging portion 82a of the engaging member 8 and the engaged portion 52 of the transmission member 5 is released.

The engaging member 8 engages with the transmission member 5 to transmit the driving force transmitted from the driving portion 4 to the transmission member 5 , and disengages from the transmission member 5 to transmit the driving force transmitted from the driving portion 4 . The method of transmitting the driving force from the driving portion 4 to the engaging member 8 is not particularly limited as long as the transmission of the force to the transmission member 5 can be interrupted. In this embodiment, the driving force of the driving portion 4 is transmitted to the engaging member 8 via the transmission mechanism TM. By engaging the engaging member 8 with the transmission mechanism TM in the moving direction (the rotation direction in this embodiment) of the transmission mechanism TM, the driving force of the drive unit 4 is transmitted from the transmission mechanism TM, and the engaging member 8 moves along with the transmission mechanism TM. It is configured to move (in this embodiment, rotate). More specifically, as shown in FIGS. 10A and 11A, the engagement member 8 is arranged so that the engagement pin 82 of the engagement member 8 is connected to the transmission mechanism regardless of the above-described engaged position and disengaged position. By being disposed through the through hole 74 of the TM, the engaging portion 82a of the engaging member 8 and the engaged portion 73 of the transmission mechanism TM are engaged with each other, and are configured to rotate together with the transmission mechanism TM. be done. As a result, the transmission mechanism TM can transmit the driving force to the transmission member 5 via the engagement member 8 . The driving device 1 of this embodiment is configured such that the driving force of the driving portion 4 is transmitted to the engaging member 8 via the transmission mechanism TM. It may be configured such that a driving force is transmitted.

The biasing member 9 biases the engaging member 8 from the engaged position to the disengaged position along the biasing direction BD. In this embodiment, the biasing member 9 is provided between the transmission mechanism TM (inner peripheral gear 7) and the engaging member 8 (base portion 81) in the direction of the axis X, as shown in FIGS. 10A and 11A. , urges the engagement member 8 in the direction of the axis X with respect to the transmission mechanism TM in the direction away from the transmission mechanism TM. The engaging member 8 is moved by the biasing member 9 from the engaging position where the engaging member 5 is engaged with the transmitting member 5 in the X-axis direction to the transmitting member 5 away from the transmitting member 5 in the X-axis direction. is biased toward a disengaged position where the disengagement of the The biasing member 9 is not particularly limited as long as it can bias the engagement member 8 from the engagement position to the disengagement position, but in this embodiment, it is embodied by a coil spring.

The moving member 10 has an engagement assistance position (position shown in FIG. 10A) that moves the engagement member 8 to the engagement position, and an engagement release assistance position that permits movement of the engagement member 8 to the engagement release position (FIG. 10A). 11A position). The moving member 10 engages the engaging member 8 with the transmission member 5 by being positioned at the engagement assisting position, and engages the engaging member 8 with the transmission member 5 by being positioned at the engagement release assisting position. release the connection. As shown in FIG. 5 , the moving member 10 is arranged on the biasing direction BD side of the biasing member 9 with respect to the engaging member 8 , and is moved through the engaging member 8 by the biasing force of the biasing member 9 . are biased along the biasing direction BD. By moving to the engagement assistance position, the moving member 10 moves the engagement member 8 to the engagement position against the biasing force of the biasing member 9, and moves to the engagement release assistance position. , the biasing force of the biasing member 9 allows the engaging member 8 to move to the disengaged position.

The movement member 10 is not particularly limited as long as it can move between the engagement assistance position and the engagement release assistance position. In this embodiment, the moving member 10 is configured to move along the axis X between the engagement assist position and the disengagement assist position, as shown in FIGS. 10A and 11A. The moving member 10 is arranged so as to contact the engaging member 8 directly or indirectly on the opposite side of the engaging member 8 from the transmission member 5 in the axial X direction. By positioning the moving member 10 at the engagement assistance position, which is closer to the transmission member 5 in the X-axis direction than the engagement release assistance position, the engagement member 8 is pushed against the biasing force of the biasing member 9 . Position along the axis X into the engagement position close to the transmission member 5 . Further, the moving member 10 is positioned at the engagement release assistance position, which is a position farther from the transmission member 5 in the axial X direction than the engagement assistance position, so that the engagement member 8 is axially moved by the biasing force of the biasing member 9 . Allows movement along X to a disengaged position remote from the transmission member 5 . However, although the engagement assist position and the disengagement assist position are provided along the axis X direction in this embodiment, they are not limited to such arrangement. It is also possible to provide along

The above-described movement of the moving member 10 in the direction of the X-axis is not particularly limited, but in the present embodiment, it is realized along with the rotational movement of the moving member 10 about the X-axis. By moving to a predetermined rotational position about the axis X, the moving member 10 moves along the axis X in a direction approaching the transmission member 5 against the biasing force of the biasing member 9 to assist engagement. 10A) and moving to another predetermined rotational position about the axis X, the force of the biasing member 9 moves away from the transmission member 5 along the axis X. to the disengagement auxiliary position (the position of FIG. 11A). For that purpose, in this embodiment, as shown in FIG. is in contact with the engaging member 8 on one side thereof, and is in contact with the wall portion 11 on the other side in the axial X direction. The moving member 10 receives the biasing force of the biasing member 9 via the engaging member 8 and is held in a state of being pressed against the wall portion 11 in the X-axis direction.

Here, in this embodiment, as shown in FIG. 8A, the moving member 10 includes a substantially annular base portion 10a and a plurality of base portions 10a provided along the circumferential direction on the inner peripheral surface of the base portion 10a. 4) sliding portions 10b. The moving member 10 abuts the engaging member 8 on the surface of the base portion 10a on the side of the engaging member 8 in the X-axis direction (the lower surface in FIG. 8A), and the wall portion 11 of the sliding portion 10b in the X-axis direction. The side surface (upper surface in FIG. 8A) contacts the wall portion 11 . When the moving member 10 rotates, the sliding portion 10b slides on a sliding portion 11c (see FIG. 9) formed on the wall portion 11 so as to correspond to the sliding portion 10b. The sliding portion 10b includes a flat surface 10c extending in the circumferential direction substantially perpendicular to the axis X, and an inclined surface 10d inclined from the vertical surface to the axis X in the circumferential direction. The inclined surface 10d extends from the wall portion 11 side toward the engaging member 8 side (from top to bottom in FIG. 8A) in the direction of the axis X as it goes in a third direction D3, which is one direction in the circumferential direction about the axis X. It is slanted so that When the moving member 10 rotates in the third direction D3 from the state shown in FIG. is guided by the inclined surface 11e of the wall portion 11, and moves toward the transmission member 5 along the axis X against the biasing force of the biasing member 9 (downward in FIG. 11A). 10A, where the flat surface 10c of the moving member 10 and the flat surface 11d of the wall portion 11, which will be described later, are in contact with each other. When the moving member 10 rotates in the fourth direction D4 opposite to the third direction D3 from the state shown in FIG. 10A), it moves away from the transmission member 5 along the axis X (upward in FIG. 10A) by the biasing force of the biasing member 9, and is positioned at the disengagement assistance position shown in FIG. 11A.

Movement of the moving member 10 between the auxiliary engagement position and the auxiliary disengagement position is performed by an actuator 12 . In the present embodiment, the moving member 10 is rotated about the axis X by the actuator 12 to move along the axis X direction between the engagement assisting position and the disengagement assisting position. As shown in FIG. 8A, the moving member 10 includes a moving member-side connecting portion 10e that is directly or indirectly connected to the actuator 12 for connection with the actuator 12. As shown in FIG. The moving member-side connecting portion 10e is arranged so as to at least partially enter a through-hole (hereinafter referred to as a connecting through-hole 11a) of the wall portion 11, which will be described later, when the moving member 10 is in the disengagement assistance position. (see FIG. 11A). In this embodiment, as shown in FIG. 8A, the moving member-side connecting portion 10e is provided so as to protrude from the base portion 10a toward the wall portion 11 in the axial X direction.

The moving member 10 may be directly or indirectly connected to the actuator 12 and moved between the engagement assisting position and the disengagement assisting position by the actuator 12, and the method of coupling with the actuator 12 is not particularly limited. In this embodiment, as shown in FIGS. 4 and 5, the moving member 10 is indirectly connected to the actuator 12 via a link member 13 provided in the clutch mechanism CM. The moving member 10 is indirectly driven by the actuator 12 via the link member 13 by connecting the moving member side connecting portion 10 e to the link member 13 that is moved by the actuator 12 . As shown in FIG. 2, the link member 13 is configured to move the moving member 10 between an engagement assistance position and an engagement release assistance position by movement of the link member 13. It is connected to the moving member side connecting portion 10e through the connecting through hole 11a).

The link member 13 is moved by the actuator 12, and the movement direction of the link member 13 is not particularly limited as long as the moving member 10 can be moved between the engagement assistance position and the engagement release assistance position. In this embodiment, the link member 13 is rotatably provided with respect to the wall portion 11 . For that purpose, the link member 13 is fixed to a link member rotary shaft 13a rotatably supported on the wall portion 11, as shown in FIG. The moving member 10 is rotatably movable by an actuator 12 via a link member 13 rotatable with respect to the wall portion 11 . The link member 13 is formed so as to extend radially outward from the link member rotating shaft 13a. ing. The link member side connecting portion 13b of the link member 13 is connected to the moving member side connecting portion 10e of the moving member 10 so that the moving member 10 can move relative to the link member 13 in the axial X direction. Thereby, when the link member 13 is rotationally moved by the actuator 12, the moving member 10 can be moved along the axis X direction while being rotationally moved. As shown in FIG. 5, the link member side connecting portion 13b of the link member 13 is formed in a rod shape extending along the axis X direction, and is provided at the moving member side connecting portion 10e of the moving member 10. It is inserted through an insertion hole 10f (see FIG. 8A) extending along the direction. The link member 13 is rotated around the axis X by the actuator 12, and by rotating the moving member 10 around the axis X, the moving member 10 is moved between the engagement assistance position and the engagement release assistance position. move. In the present embodiment, as described above, the rotating shaft of the moving member 10 and the rotating shaft of the link member 13 are arranged coaxially, whereby the rotating movement of the moving member 10 is performed smoothly.

As shown in FIG. 5, the wall portion 11 is arranged on the biasing direction BD side of the biasing member 9 with respect to the moving member 10, and has a space in which the moving member 10 is provided and a space in which the actuator 12 is provided. It is a part provided between The wall 11 is configured as part of the housing H in this embodiment, as shown in FIGS. However, the wall portion 11 may be provided separately from the housing H. The wall portion 11 is provided with a through hole (connecting through hole 11 a ) for connecting the moving member 10 and the actuator 12 . In this embodiment, the moving member side connecting portion 10e of the moving member 10 and the link member side connecting portion 13b of the link member 13 connected to the actuator 12 are connected through the connecting through hole 11a. The connecting through-hole 11a is arranged so that the moving member-side connecting portion 10e at least partially enters when the moving member 10 is in the disengagement assistance position (see FIG. 11A). The wall portion 11 also includes a link member through hole 11b for movably connecting the link member 13 . A link member rotating shaft 13a of the link member 13 is rotatably fixed to the link member through hole 11b.

In the present embodiment, the wall portion 11 abuts against the moving member 10 in the direction of the axis X, and exerts a reaction force against the biasing force in the direction of the axis X with respect to the moving member 10 that is biased by the biasing force of the biasing member 9 . configured to add The wall portion 11 includes a sliding portion 11c that contacts the sliding portion 10b of the moving member 10, as shown in FIG. The sliding portion 11c of the wall portion 11 is formed along the circumferential direction with the axis X as the center. The sliding portion 10b of the moving member 10 slides while being pressed onto the sliding portion 11c of the wall portion 11 in the X-axis direction by the biasing force of the biasing member 9 when the moving member 10 rotates. The sliding portion 11c of the wall portion 11 includes a flat surface 11d extending along the circumferential direction substantially perpendicular to the axis X, and an inclined surface 11e inclined along the circumferential direction from the vertical surface to the axis X. there is The inclined surface 11e of the wall portion 11 is arranged on the wall portion 11 side in the direction of the axis X toward the third direction D3, which is one direction in the circumferential direction about the axis X, so as to correspond to the inclined surface 10d of the moving member 10. , toward the moving member 10 side. As described above, the inclined surface 11e of the wall portion 11 is arranged so that the inclined surface 10d of the moving member 10 slides when the moving member 10 rotates, so that the moving member 10 moves along the X-axis direction. to guide the moving member 10 to. Further, the flat surface 11d of the wall portion 11 contacts the flat surface 10c of the moving member 10, thereby positioning the moving member 10 at the engagement assisting position.

As shown in FIGS. 2, 5, and 10A to 11B, the wall portion 11 is provided with a stopping portion 14 that stops the movement of the moving member 10 by coming into direct or indirect contact with the moving member 10. ing. In the present embodiment, as shown in FIGS. 11A and 11B , the stopping portion 14 abuts the link member 13 to indirectly abut the moving member 10 via the link member 13 . Provided to stop movement. Moving member 10 directly engages stop 14 as moving member 10 moves from the assisted engagement position (the position of FIGS. 10A and 10B) toward the assisted disengagement position (the position of FIGS. 11A and 11B). Alternatively, by indirectly contacting, the moving member 10 is stopped at a position P (see FIG. 11A) where it does not contact the peripheral wall of the through hole (connecting through hole 11a) of the wall portion 11 . As a result, in the clutch mechanism CM of the present embodiment, the moving member 10 stops at the position P (see FIG. 11A) where the moving member 10 does not come into contact with the peripheral wall of the through hole (connecting through hole 11a) of the wall portion 11. The moving member 10 is surely moved from the engagement assisting position to the disengagement assisting position without the moving member 10 slipping under the driving force 11, and the transition from the driving force transmission enabled state to the driving force transmission cutoff state is performed. can be done more reliably. The stopping portion 14 only needs to be able to stop the movement of the moving member 10 at the predetermined position described above, and may be provided so as to directly contact the moving member 10 .

Stopping portion 14 may directly or indirectly contact moving member 10 and stop the movement of moving member 10 at the predetermined position described above, and the position of wall portion 11 provided is not particularly limited. In this embodiment, as shown in FIG. 5, the stop portion 14 protrudes from the wall portion 11 opposite to the moving member 10 with respect to the biasing direction BD of the biasing member 9 with the wall portion 11 interposed therebetween. . A stop 14 protruding from the surface of the wall 11 opposite the moving member 10 in the direction of the axis X abuts the link member 13 connected to the moving member 10, as shown in FIGS. 11A and 11B. , is arranged to stop the movement of the moving member 10 . In particular, the stop portion 14 is arranged so as to contact the link member 13 at a position (position in the radial direction) between the link member rotating shaft 13a of the link member 13 and the link member side connecting portion 13b. As a result, for example, the moving member 10 abuts against the stop portion 14 in the vicinity of the moving member-side connecting portion 10e provided on the base portion 10a located radially outward of the moving member 10, or the radially outer portion of the link member 13 Compared to the case where the link member 13 abuts on the stop portion 14 in the vicinity of the link member side connecting portion 13b located at the distal end, the moving member side connecting portion 10e and the link member side connecting portion 13b are positioned radially inward. Since the tangential velocity of the link member 13 at the point of contact with the stop portion 14 is reduced, the collision noise when the link member 13 contacts the stop portion 14 can be suppressed.

The stop portion 14 is not particularly limited as long as it can directly or indirectly contact the moving member 10 to stop the movement of the moving member 10 . In this embodiment, as shown, for example, in FIGS. 11A and 11B, the contact portion of the stop portion 14 with the link member 13 is formed substantially flat. Similarly, the contact portion of the link member 13 with the stop portion 14 is formed substantially flat. The stop portion 14 is arranged so as to come into surface contact with the link member 13 when coming into contact with the link member 13 . Since the link member 13 and the stop portion 14 come into surface contact with each other, the impact when the link member 13 comes into contact with the stop portion 14 is reduced, and the impact noise at the time of contact can be suppressed. Breakage of the member 13 and the stopping portion 14 can be suppressed.

As shown in FIG. 2, the actuator 12 is directly or indirectly connected to a moving member-side connecting portion 10e of the moving member 10 through a through hole (connecting through hole 11a) of the wall portion 11 to engage the moving member 10. It is moved between the engagement assist position and the disengagement assist position. The actuator 12 is not particularly limited as long as it can move the moving member 10 between the engagement assistance position and the engagement release assistance position, and can be configured by a known solenoid. The actuator 12, which is a solenoid in this embodiment, includes a plunger 12a (see FIGS. 10B and 11B) movable between a protruded position and a retracted position, and a coil (not shown) that generates a magnetic field when energized. , and a biasing member (not shown) that biases the plunger 12a from the retracted position to the extended position. The actuator 12 positions the plunger 12a at the projecting position by the biasing force of the biasing member in the non-operating state in which the coil is not energized, and positions the plunger 12a in the retracted position by the magnetic field generated by the coil in the operating state in which the coil is energized. . The actuator 12 moves the plunger 12a from the protruding position to the retracted position by shifting from the non-operating state to the operating state, thereby rotating and moving the link member 13 connected to the plunger 12a in the third direction D3. Position member 10 in the assisted engagement position (from the state shown in FIGS. 11A and 11B to the state shown in FIGS. 10A and 10B). Conversely, the actuator 12 moves the plunger 12a from the retracted position to the protruding position by shifting from the operating state to the non-operating state, thereby rotating the link member 13 connected to the plunger 12a in the fourth direction D4. 10A and 10B to the state shown in FIGS. 11A and 11B).

Next, the clutch mechanism CM of the present embodiment and the operation of the driving device 1 equipped with the clutch mechanism CM will be described with an example of pulling a wheelchair WC into the vehicle V. FIG. However, the operation shown below is just an example, and the operation of the clutch mechanism and the driving device of the present invention is not limited to the following example.

To tow the wheelchair WC, a traction member 2 is extended from the drive 1 to the wheelchair WC and the other end of the traction member 2 is connected to the wheelchair WC via a hook F, as shown in FIG. . At this time, in order to let out the pulling member 2 from the winding member 3, first, in the ratchet mechanism RM shown in FIG. A second functional state in which the pawl member RM2 is not engaged with the ratchet teeth RM1 is positioned away from RM1. By setting the ratchet mechanism RM to the second functional state, the transmission member 5 is allowed to rotate in the second direction D2, and the winding member 3 rotatable together with the transmission member 5 also moves in the second direction in which the traction member 2 is paid out. Rotation to D2 is enabled. Next, in the clutch mechanism CM, by putting the actuator 12 into a non-operating state, the link member 13 is rotated in the fourth direction D4 from the position shown in FIGS. Position. By positioning the moving member 10 at the engagement release assist position, the engagement member 8 is biased in the biasing direction BD by the biasing member 9 to be positioned at the engagement release position (position shown in FIG. 11A). As a result, the driving device 1 is in a state in which transmission of the driving force is interrupted, the connection between the transmission member 5 and the transmission mechanism TM is released, and the transmission member 5 is allowed to rotate without being restricted by the transmission mechanism TM. Accordingly, since the winding member 3 is allowed to rotate in the second direction D2, the traction member 2 can be drawn out from the winding member 3 and extended to the position of the wheelchair WC.

Next, the traction member 2 is wound up to pull the wheelchair WC. Before this, the ratchet mechanism actuator RM3 in the ratchet mechanism RM shown in FIG. switch. Thereby, the pawl member RM2 is positioned close to the ratchet teeth RM1 and the ratchet mechanism RM is in a first functional state in which the pawl member RM2 can engage the ratchet teeth RM1. By setting the ratchet mechanism RM to the first functional state, the transmission member 5 is allowed to rotate in the first direction D1, which is the direction in which the traction member 2 is wound up, and in the second direction, which is the direction in which the traction member 2 is extended. Rotation to D2 is restricted. As a result, for example, even if the traction member 2 is pulled from the wheelchair WC while the wheelchair WC is being towed, the transmission member 5 and the winding member 3 are restricted from rotating in the second direction D2, so that the traction member 2 is driven. Pulling out of the device 1 is suppressed. Next, the actuator 12 of the clutch mechanism CM is switched from the non-operating state to the operating state, and the clutch mechanism CM changes from the driving force transmission cutoff state to the driving force transmission possible state. Here, by switching the actuator 12 of the clutch mechanism CM from the non-operating state to the operating state, the link member 13 rotates in the third direction D3 from the state shown in FIGS. Rotate in three directions D3. When the moving member 10 rotates in the third direction D3, the inclined surface 10d of the moving member 10 is guided by the inclined surface 11e of the wall portion 11 to bias the moving member 10, as shown in FIGS. 10A and 10B. It moves toward the transmission member 5 along the axis X against the biasing force of the member 9 . As the moving member 10 moves toward the transmission member 5 along the axis X, the engagement member 8 moves toward the transmission member 5 along the axis X, and the engagement member 8 moves toward the transmission member 5 . The engagement pin 82 enters the through hole 53 of the transmission member 5 and is positioned at the engagement position where it can be engaged with the transmission member 5 . The engaging member 8 receives the driving force transmitted from the drive unit 4 by inserting the engaging pin 82 through the through hole 74 of the transmission mechanism TM and inserting it into the through hole 53 of the transmission member 5 . can be transmitted to the transmission member 5 from the

After setting the clutch mechanism CM to a state in which the driving force can be transmitted, the drive unit 4 is driven to wind the pulling member 2 around the winding member 3 to pull the wheelchair WC. Here, as shown in FIG. 4 , when the motor 41 of the driving section 4 is operated, the driving force transmission shaft 43 and the driving force transmission gear 44 rotate in the first direction D1 via the worm gear portion 42 . When the driving force transmission gear 44 rotates in the first direction D1, the transmission mechanism TM rotates in the first direction D1 in conjunction with the rotation of the driving force transmission gear 44 . At this time, as the driving force transmission gear 44 rotates in the first direction D1, the outer peripheral gear 6 of the transmission mechanism TM rotates in the first direction D1, and the outer peripheral gear 6 rotates through the pawl member 61 of the outer peripheral gear 6. The connected inner peripheral gear 7 rotates in the first direction D1 (see FIG. 7). When the transmission mechanism TM rotates in the first direction D1, the transmission member 5 connected to the transmission mechanism TM via the clutch mechanism CM rotates in the first direction D1. As the transmission member 5 rotates in the first direction D<b>1 , the winding member 3 rotates in the first direction D<b>1 , and the winding member 3 winds up the pulling member 2 . In this manner, the driving device 1 can tow the wheelchair WC into the vehicle V. FIG.

After the towing of the wheelchair WC is completed, the power of the driving device 1 is turned off. At this time, the ratchet mechanism actuator RM3 of the ratchet mechanism RM shown in FIG. 6 is maintained in a non-operating state. In this state, since the rotation of the transmission member 5 in the second direction D2 is restricted, the rotation of the winding member 3 in the second direction D2 is also restricted accordingly, and the pulling member from the winding member 3 is pulled. 2 is suppressed. The wheelchair WC can be fixed in the vehicle V by remaining connected with the drive 1 in this state. When the drive device 1 is powered off, the actuator 12 of the clutch mechanism CM switches from the operating state to the non-operating state, and the clutch mechanism CM switches from the driving force transmission enabled state to the driving force transmission cutoff state. At this time, the actuator 12 of the clutch mechanism CM switches from the operating state to the non-operating state, so that the link member 13 rotates in the fourth direction D4 from the state shown in FIGS. Rotate in the fourth direction D4. When the moving member 10 rotates in the fourth direction D4, the inclined surface 10d of the moving member 10 is guided by the inclined surface 11e of the wall portion 11 to bias the moving member 10, as shown in FIGS. 11A and 11B. It is pressed together with the engaging member 8 by the biasing force of the member 9 and moves along the axis X in the direction away from the transmission member 5 . As the moving member 10 moves away from the transmission member 5 along the axis X, the engaging member 8 moves away from the transmission member 5 along the axis X, The engagement pin 82 is pulled out from the through hole 53 of the transmission member 5 . Then, the engaging member 8 is positioned at the disengaged position and disengaged from the transmission member 5 . As a result, the clutch mechanism CM enters the driving force transmission cutoff state.

Here, not only when the towing of the wheelchair WC is completed as described above and the power source of the driving device 1 is turned off, but also when the wheelchair WC is being towed, for example, an obstacle is encountered in the movement path of the wheelchair WC. When it is necessary to interrupt traction of the wheelchair WC, the actuator 12 of the clutch mechanism CM is switched from the operating state to the non-operating state in order to switch the clutch mechanism CM from the driving force transmission possible state to the driving force transmission cutoff state. may switch to In such a case, even if the engaging member 8 and the transmission member 5 are firmly engaged when the engaging member 8 is in the engaging position and the biasing force of the biasing member 9 is received, the engagement will not occur. The joint member 8 may not be able to move along the axis X in the direction away from the transmission member 5 . Then, even if the actuator 12 of the clutch mechanism CM is switched from the operating state to the non-operating state to rotate the link member 13 and the moving member 10 in the fourth direction D4, the moving member 10 is also a transmission member along the axis X. It cannot move away from 5 (see Figure 12A). Here, in the clutch mechanism CM of the present embodiment, the moving member 10 moves in the fourth direction D4 from the engagement assistance position (the position shown in FIGS. 10A and 10B) to the engagement release assistance position (FIGS. 11A and 11A). 11B)) to stop the movement of the moving member 10. As shown in FIG. The moving member 10 comes into contact with the stop portion 14 via the link member 13, and stops at a position P where it does not come into contact with the peripheral wall of the connecting through hole 11a of the wall portion 11 (see FIG. 11A). The clutch mechanism CM of the present embodiment is provided with such a stop portion 14, so that when the moving member 10 is rotated in the fourth direction D4, it separates from the transmission member 5 along the axis X as described above. 12A and 12B, which show the case where no stopping portion is provided, the moving member-side connecting portion 10e of the moving member 10 is connected to the connecting through hole of the wall portion 11 even if the moving member 10 cannot move in any direction. Crawling under the wall portion 11 beyond 11a can be suppressed. As a result, the strong engagement between the engaging member 8 and the transmission member 5 is later released at the position where the moving member 10 indirectly abuts the stop portion 14 via the link member 13, and the attachment is performed. Even if the engaging member 8 moves away from the transmission member 5 along the axis X due to the biasing force of the biasing member 9, the moving member 10 moves to the disengagement assistance position shown in FIGS. 11A and 11B. be able to. In contrast, when the clutch mechanism CM does not include the stop portion 14, the firm engagement between the engagement member 8 and the transmission member 5 is released from the state shown in FIGS. 12A and 12B. , even if the engaging member 8 moves away from the transmission member 5 along the axis X due to the biasing force of the biasing member 9, the moving member-side connecting portion 10e of the moving member 10 does not move through the connecting through hole of the wall portion 11. Since the moving member 10 abuts against the wall portion 11 without being able to enter 11a, the moving member 10 is not positioned at the engagement release assistance position. Thus, in the clutch mechanism CM of this embodiment, the transition from the driving force transmission enabled state to the driving force transmission cutoff state can be performed more reliably.

REFERENCE SIGNS LIST 1 driving device 2 traction member 3 winding member 4 driving portion 41 motor 42 worm gear portion 43 driving force transmission shaft 44 driving force transmission gear 5 transmission member 51 fitting hole 52 engaged portion 53 through hole 54 guide surface 6 outer peripheral gear 61 Claw member 62 biasing member 7 inner gear 71 recess 72 insertion hole 73 engaged portion 74 through hole 8 engaging member 81 base 81a insertion hole 82 engaging pin 82a engaging portion 9 biasing member 10 moving member 10a base 10b Sliding portion 10c Plane 10d Inclined surface 10e Moving member side connecting portion 10f Insertion hole 11 Wall portion 11a Through hole (connecting through hole)
11b link member through hole 11c sliding portion 11d plane 11e inclined surface 12 actuator 12a plunger 13 link member 13a link member rotating shaft 13b link member side connecting portion 14 stopping portion BD biasing direction CM clutch mechanism D1 first direction D2 second Two directions D3 Third direction D4 Fourth direction F Hook H Housing LP Cargo platform P Position where the moving member does not contact the peripheral wall of the through hole (connecting through hole) of the wall RM Ratchet mechanism RM1 Ratchet teeth RM2 Pawl member RM21 One side RM22 Other end RM3 Ratchet mechanism actuator RM4 Rotating shaft RS Rotating shaft member SL Slope SM Supporting member SM1 Side wall TM Transmission mechanism V Vehicle WC Wheelchair X axis

Claims (6)

In a driving device for transmitting driving force from a driving unit to a driven object, a driving force transmissible state in which a transmission member can transmit the driving force to the driven object, and transmission of the driving force to the driven object by the transmission member A clutch mechanism for switching between a driving force transmission cutoff state that cuts off the
An engagement member engageable with the transmission member, wherein an engagement position engages with the transmission member to place the transmission member in the driving force transmissible state, and an engagement position disengages from the transmission member. an engagement member movable between an engagement release position where the transmission member is in the driving force transmission cutoff state;
a biasing member that biases the engaging member from the engaging position to the disengaged position along a biasing direction;
an engagement assistance position arranged on the side of the engagement member in the biasing direction for moving the engagement member to the engagement position, and allowing movement of the engagement member to the disengagement position. a moving member movable between the disengagement auxiliary position and
a wall portion disposed on the biasing direction side with respect to the moving member and provided with a through hole;
an actuator that is directly or indirectly connected to the moving member-side connecting portion of the moving member through the through hole and moves the moving member between the engagement assist position and the engagement release assist position; ,
the moving member-side connecting portion is arranged to at least partially enter the through hole when the moving member is in the engagement release assistance position;
The wall portion has a position where the moving member does not come into contact with the peripheral wall of the through hole when the moving member moves from the engagement assistance position toward the engagement release assistance position. Alternatively, a stop portion is provided that stops the movement of the moving member by indirectly contacting it.
clutch mechanism. The clutch mechanism includes a link member that is moved by the actuator,
the link member is connected to the moving member-side connecting portion through the through hole so that the moving member can move between the engagement assistance position and the engagement release assistance position by movement of the link member;
The stop portion protrudes from the wall portion in the opposite direction to the moving member with respect to the biasing direction of the biasing member across the wall portion, and contacts the link member to prevent the movement of the moving member. arranged to stop
2. A clutch mechanism according to claim 1. The link member is rotatably provided with respect to the wall portion and is formed to extend radially outward from the rotation axis of the link member,
A link member side connecting portion that connects with the moving member side connecting portion is provided at a radially outer tip of the link member,
The stop portion is arranged to contact the link member at a position between the rotating shaft and the link member side connecting portion,
3. A clutch mechanism according to claim 2. The moving member is configured to be rotatably movable by the actuator via the link member,
the rotation axis of the moving member and the rotation axis of the link member are arranged coaxially;
A clutch mechanism according to claim 2 or 3. A contact portion of the link member with the stop portion is formed substantially flat,
A contact portion of the stop portion with the link member is formed substantially flat,
The stop portion is arranged so as to come into surface contact with the link member when contacting the link member.
A clutch mechanism according to any one of claims 2-4. a traction member;
a winding member capable of winding and unwinding the traction member;
a driving unit that generates a driving force for rotating the winding member;
a transmission member that transmits the driving force to the winding member;
a transmission mechanism disposed between the driving portion and the transmission member, and configured to transmit the driving force from the driving portion to the transmission member;
A driving device comprising the clutch mechanism according to any one of claims 1 to 5.

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