JP7411532B2 - drive device - Google Patents

Description

The present invention relates to a drive device.

For example, mechanisms for holding a predetermined object in a predetermined position, such as a device for fixing a wheelchair to a vehicle, are known (for example, see Patent Document 1). For example, when holding a wheelchair in a predetermined position in a vehicle, the drive unit drives the wire to tow the wheelchair into the vehicle, and then holds the wire in a predetermined position to prevent the wheelchair from moving while the vehicle is being driven. must be held to hold the wheelchair stable. On the other hand, it is desirable that a fixing device for holding a predetermined object such as a wheelchair in a predetermined position has an inexpensive and simple structure for regulating rotation of a driven member rotated by a drive section.

Patent Document 2 discloses a device using a clutch mechanism that holds an object in a predetermined position with a simple structure. The device of Patent Document 2 includes a motor, a camshaft rotated by the motor, a cam case provided on the radially outer side of the camshaft and rotatable relative to the camshaft, and a sleeve provided on the cam case. has a pulley body located on the radially outer side of the cam case. The cam case has a pair of lever-shaped cam bodies arranged symmetrically across the cam shaft. The cam body is swingably attached to the cam case by a pin, and when the camshaft rotates in one direction by a predetermined amount, the clutch protrusion of the cam body protrudes radially outward and engages the clutch protrusion provided in the sleeve of the pulley body. The clutch recess is configured to engage with the clutch recess. Through this clutch engagement, the rotation of the camshaft is transmitted to the pulley body, the opening/closing string wrapped around the pulley body is operated, and when the motor is stopped, the pulley body, which is a driven member that follows the drive of the drive unit, rotates. stops, and the target operated by the pulley body stops at a predetermined position. When the motor stops, in Patent Document 2, the cam body is returned to a state out of engagement with the clutch recess by a return spring that biases the cam body radially inward.

Japanese Patent Application Publication No. 2013-121415 Japanese Patent Application Publication No. 5-231449

In the case of the structure of Patent Document 2, the cam body (hereinafter referred to as the engaging member) is not engaged with the clutch recessed portion (hereinafter referred to as the engaged portion) due to the return spring, so it is difficult to fix the wheelchair. It is not possible to maintain a predetermined tension on wires, belts, etc. Furthermore, when tension is applied from wires or belts used to secure the wheelchair, the engagement between the engaging member (cam body) and the engaged portion (clutch recess) of Patent Document 2 becomes difficult to release. . In such a state, even if an attempt is made to move the engaging member (cam body) in the direction of retracting the engaging member (cam body) radially inward by rotation of the driving part, in Patent Document 2, the cam member (cam shaft) is not engaged by the driving part. Even if the member (cam body) is rotated in the opposite direction to the direction in which the member (cam body) protrudes radially outward, no force is applied in the direction to retract the engaging member (cam body) radially inward, and the rotational force of the drive unit The engaging member (cam body) cannot be stored radially inward.

Therefore, the present invention allows the engaging member operated by the cam member to be brought into an engaged state and a disengaged state with respect to the engaged part by rotating the cam member in both directions by the driving force of the driving part. The purpose is to provide a drive device that is possible.

The drive device of the present invention includes a drive unit, a cam member that rotates in a first direction and a second direction opposite to the first direction by the driving force of the drive unit, and operates by rotation of the cam member. a first driven member that includes an engaging member and is rotatable relative to the cam member; and an engaged portion that is engaged with the engaging member, and that is rotatable relative to the cam member and the first driven member. a rotatable second driven member, and the engaging member includes a claw portion that engages with the engaged portion, and when the cam member rotates in the first direction or the second direction, the engaging member and a pressing part pressed by the cam member, and the pressing part is pressed by the cam member when the cam member rotates in the first direction, thereby causing the engaging member to move in the second direction. When the cam member is rotated in the second direction, the engaging member is pressed by the cam member, and the engaging member is brought into contact with the second driven member. a second pressing portion that is in a disengaged state in which engagement with the member is released, and the cam member engages the engaging member by pressing the first pressing portion of the engaging member. The engagement member has a first cam portion that brings the engagement member into the disengaged state, and a second cam portion that pushes the second pressing portion of the engagement member to bring the engagement member into the disengaged state.

According to the drive device of the present invention, by rotating the cam member in both directions by the driving force of the drive unit, the engaging member operated by the cam member can be brought into an engaged state and a disengaged state with respect to the engaged part. can do.

FIG. 1 is an exploded perspective view of a drive device according to a first embodiment of the present invention. FIG. 1 is a perspective view of a wheelchair fixing device including a drive device according to a first embodiment of the present invention. 1 is a schematic diagram showing a state in which a wheelchair is fixed by a wheelchair fixing device including a drive device according to a first embodiment of the present invention; FIG. It is a top view of a wheelchair fixing device provided with the drive device of a 1st embodiment of the present invention. 5 is a sectional view taken along the line VV in FIG. 4. FIG. FIG. 2 is a perspective view showing a cam member of the drive device of FIG. 1; FIG. 2 is a schematic diagram showing a state before the drive device of FIG. 1 operates. FIG. 2 is a schematic diagram showing an engaged state in which the engaging member of the drive device of FIG. 1 is engaged with a second driven member. FIG. 2 is a schematic diagram showing a disengaged state in which the engagement member and the second driven member of the drive device in FIG. 1 are disengaged. FIG. 6 is an enlarged view of the engaging portion between the claw portion of the engaging member and the engaged portion of the second driven member. FIG. 6 is a schematic diagram showing a state in which the second pressing portion of the engaging member in the engaged state is pressed by the second cam portion of the cam member. FIG. 7 is a schematic diagram showing a disengaged state before the drive device of the second embodiment operates. FIG. 7 is a schematic diagram showing an engaged state in which the engaging member of the drive device of the second embodiment is engaged with the second driven member. FIG. 7 is an enlarged view of the engaging portion between the claw portion of the engaging member and the engaged portion of the second driven member in the drive device of the second embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A driving device according to an embodiment of the present invention will be described below with reference to the drawings. Note that the embodiment shown below is just an example, and the drive device of the present invention is not limited to the following embodiment.

<First embodiment>
As shown in FIG. 1, the drive device 1 of the present embodiment includes a drive unit 2 and a cam member that rotates in a first direction and a second direction opposite to the first direction by the drive force of the drive unit 2. 3, a first driven member 4 which has an engaging member 41 that operates by rotation of the cam member 3 and is rotatable relative to the cam member 3, and an engaged portion 51 that the engaging member 41 engages with. It includes a cam member 3, a first driven member 4, and a second driven member 5 that is relatively rotatable. In this embodiment, the cam member 3, the first driven member 4, and the second driven member 5 are housed in the housing H (see FIG. 5). In this specification, one rotational direction of the cam member 3 is referred to as a first direction D1, and a rotational direction opposite to the first direction D1 is referred to as a second direction D2 (see FIGS. 7 to 9). Further, when the cam member 3 rotates in the first direction D1, the direction in which the first driven member 4 and the second driven member 5 rotate is also called the first direction D1, and the direction in which the first driven member 4 and the second driven member 5 rotate. The rotation direction of the member 5 that is opposite to the first direction D1 is called a second direction D2.

The drive device 1 operates a predetermined operation target OP (see, for example, FIGS. 2 and 3) by driving the drive unit 2. More specifically, the drive device 1 operates the operation target OP via the cam member 3, the first driven member 4, and the second driven member 5 by driving the drive unit 2. Note that the application to which the drive device 1 is applied is not particularly limited as long as the operation target OP can be operated by driving the drive unit 2. The operation target OP operated by the drive device 1 is directly or indirectly connected to the second driven member 5, and performs a predetermined operation by rotation of the second driven member 5. The operation target OP can be an elongated member such as a belt or a wire (hereinafter also referred to as elongated member OP), but is not particularly limited as long as it can be operated by the operation of the drive device 1.

In this embodiment, as shown in FIG. 2, the drive device 1 includes a winding section 6 where the elongated member OP is wound up and unwound, and the second driven member 5 is moved in the first direction D1 and the second direction D2. The elongated member OP is wound up and unwound by the rotation (see FIGS. 7 to 9). In the present embodiment, the drive device 1 engages one end of the elongated member OP with the fixed object (in this embodiment, the wheelchair WC shown in FIG. 3), and winds up the elongated member OP. is configured to be fixed. More specifically, as shown in FIG. 3, the drive device 1 includes an elongated member OP attached to the frame of the wheelchair WC, and the drive device 1 in order to fix the wheelchair WC, which is the fixation target, to the vehicle. It is applied to a wheelchair fixing device D equipped with. In the present embodiment, the wheelchair fixing device D is configured such that the elongated member OP is wound up by driving a plurality of drive devices 1 provided in the cabin of the vehicle, and the wheelchair WC is pulled from a plurality of directions. To stably hold a wheelchair WC in a vehicle. In this embodiment, the elongated member OP includes a belt OP1 that is wound around the winding section 6 and a hook OP2 provided at the tip of the belt OP1, as shown in FIGS. 2 and 3. . However, instead of the belt OP1 of the elongated member OP, another elongated member such as a wire may be used. Further, instead of the hook OP2 provided at the tip of the elongated member OP, other locking portions or fixing portions such as a wire having a loop-shaped tip may be provided.

The winding section 6 is directly or indirectly connected to the second driven member 5 so that the elongated member OP is wound up when the second driven member 5 rotates in a predetermined direction. In this embodiment, when the second driven member 5 rotates in the first direction D1, the winding section 6 winds up the elongated member OP, and when the elongated member OP is unwound from the winding section 6, The second driven member 5 rotates in the second direction D2. Moreover, in this embodiment, the winding part 6 is indirectly connected to the second driven member 5 via a transmission member 7 (see FIG. 1) such as a gear. In this embodiment, the winding section 6 is biased by a spring member (not shown) so as to rotate in the direction of winding up the elongated member OP.

The drive unit 2 generates a driving force that rotates the cam member 3. The drive unit 2 is directly or indirectly connected to the cam member 3. The structure of the drive section 2 is not particularly limited as long as it can rotate the cam member 3. In this embodiment, as shown in FIG. 1, the drive unit 2 includes a motor 21 that can rotate in forward and reverse directions, and an output shaft 22 that is connected to the motor 21 via a speed reduction mechanism or the like and connected to the cam member 3. It is equipped with

The cam member 3 rotates around a predetermined axis X (see FIGS. 1, 5, etc.) by the driving force of the drive unit 2. In this embodiment, the cam member 3 is directly or indirectly connected to the drive unit 2 so as to rotate in the first direction D1 and the second direction D2 around the axis X depending on the rotation direction of the drive unit 2. ing. By rotating around the axis The second driven member 5 is operated between a disengaged state in which the engagement with the driven member 5 is disengaged (see FIG. 9). Further, as will be described later, the cam member 3 rotates in the first direction D1 when the engagement member 41 is in the engaged state, thereby rotating the first driven member 4 in the first direction D1.

As shown in FIGS. 5 and 6, the cam member 3 includes a first cam portion 31a that brings the engaging member 41 into an engaged state by pressing a first pressing portion 411a, which will be described later, of the engaging member 41. The engagement member 41 has a second cam portion 31b which is brought into the disengaged state by pressing a second pressing portion 411b (described later) of the engagement member 41. The shape and structure of the cam member 3 are not particularly limited as long as the engagement member 41 can be operated between an engaged state and a disengaged state. In this embodiment, the cam member 3 has a connecting part 32 connected to the output shaft 22 of the drive part 2, a first cam part 31a, and a second cam part 31b, as shown in FIGS. 1 and 6. It has a cam portion 31 and a shaft portion 33 that is pivotally supported by the end surface of the second driven member 5. In this embodiment, the connecting portion 32, the cam portion 31, and the shaft portion 33 are provided continuously along the axis X direction.

In this embodiment, as shown in FIGS. 1 and 6, the connecting portion 32 is formed in a cylindrical shape, and the inner surface of the cylindrical connecting portion 32 is fitted with a spline provided on the outer periphery of the output shaft 22. It has a fitting part 32a (see FIG. 1). The connecting portion 32 is inserted into a through hole formed in a first base portion 42a of a first driven member 4, which will be described later, and supports the first base portion 42a so as to be rotatable around the axis X.

The cam portion 31 is a portion having a first cam portion 31a and a second cam portion 31b. In this embodiment, as shown in FIG. 6, the cam portion 31 has a cylindrical body 31c, and a plurality of cylindrical bodies (in this embodiment It has three mountain-shaped cams C. The cams C are provided corresponding to the engagement members 41, and a plurality of cams C are provided at predetermined positions in the axis X direction of the cam member 3 in the circumferential direction. Note that the shape and structure of the cam portion 31 are not particularly limited as long as it has a first cam portion 31a and a second cam portion 31b, which will be described later. In this embodiment, one mountain-shaped cam C has a first cam part 31a and a second cam part 31b, but the first cam part 31a and the second cam part 31b are provided in the same cam C. It doesn't have to be. Further, in this embodiment, the cam member 3 has three cams C (three first cam parts 31a and three second cam parts 31b), but the number of cams C provided in the cam member 3 is is not particularly limited. The cylindrical body 31c is inserted into a through hole formed in a second base 42b of the first driven member 4, which will be described later, and supports the second base 42b so as to be rotatable around the axis X. The cam member 3 and the engagement member 41 are such that when the cam member 3 rotates in one direction around the axis , and the cam member 3 rotates in the other direction around the axis 41, the second pressing portion 411b is pressed.

The shaft portion 33 is inserted into a hole formed in an end surface of a second driven member 5, which will be described later, and supports the cam member 3 so as to stably rotate around the axis X.

As will be described later, the first cam portion 31a is configured to press the engaging member 41 of the first driven member 4 when the cam member 3 rotates in a predetermined direction (first direction D1 in this embodiment). Press the portion 411a. Thereby, the engaging member 41 is moved in the direction of engaging with the second driven member 5, and the engaging member 41 is brought into the engaged state. In this embodiment, the first cam portion 31a is provided on a surface of the cam C of the cam member 3 on one side (first direction D1 side) in the rotational direction of the cam member 3. In this embodiment, the first cam portion 31a is provided so that the first pressing portion 411a can be pressed in the first direction D1 when the engagement member 41 is in both the engaged state and the disengaged state. .

In this embodiment, the first cam portion 31a is a curved surface formed on one side of the cam C in the rotational direction and curved in the circumferential direction. However, the shape of the first cam part 31a is not particularly limited as long as it can bring the engaging member 41 into the engaged state by pressing the first pressing part 411a, and may be flat. Further, in the present embodiment, a plurality (three) of the first cam portions 31a are provided in one cam member 3, spaced apart in the circumferential direction of the cam member 3, but the number of the first cam portions 31a is Not particularly limited.

As will be described later, the second cam portion 31b provides a second pressing force of the engagement member 41 of the first driven member 4 when the cam member 3 rotates in a predetermined direction (in the present embodiment, the second direction D2). Press the portion 411b. Thereby, the engagement member 41 is moved in the direction in which the engagement with the second driven member 5 is released, and the engagement member 41 is brought into the disengaged state. In this embodiment, the second cam portion 31b is provided on the surface of the cam C of the cam member 3 on the other side (second direction D2 side) in the rotational direction of the cam member 3.

In this embodiment, the second cam portion 31b is a curved surface formed on the other side of the cam C in the rotational direction and curved in the circumferential direction. However, the shape of the second cam portion 31b is not particularly limited as long as it can bring the engagement member 41 into the disengaged state by pressing the second pressing portion 411b, and may be flat. Further, in the present embodiment, a plurality (three) of the second cam portions 31b are provided in one cam member 3, spaced apart in the circumferential direction of the cam member 3, but the number of the second cam portions 31b is Not particularly limited. Further, in this embodiment, the first cam part 31a and the second cam part 31b are provided as continuous surfaces on the same one cam C, but each of the first cam part 31a and the second cam part 31b is , may be provided as separate protrusions independent of each other.

The first driven member 4 is rotatable relative to the cam member 3 around the axis X, and rotates following the rotational movement of the cam member 3 via the engagement member 41. Specifically, when the cam member 3 rotates in the first direction D1, the cam member 3 remains in the first position until the first cam portion 31a of the cam member 3 contacts the first pressing portion 411a of the first driven member 4. It rotates in the first direction D1 with respect to one driven member 4. After the first cam portion 31a of the cam member 3 contacts the first pressing portion 411a of the first driven member 4 and moves the engaging member 41 to the engaged state, the cam member 3 further rotates in the first direction D1. Then, the first driven member 4 is driven by the cam member 3 and rotates in the first direction D1. Further, when the cam member 3 rotates in the second direction D2, the first driven member 4 is rotated until the second cam portion 31b of the cam member 3 comes into contact with the second pressing portion 411b of the first driven member 4. The member 3 rotates in the second direction D2 relative to the first driven member 4. After the second cam portion 31b of the cam member 3 contacts the second pressing portion 411b of the first driven member 4 and moves the engagement member 41 to the disengaged state, the cam member 3 rotates in the second direction D2. Then, the first driven member 4 is driven by the cam member 3 and rotates in the second direction D2.

Further, the first driven member 4 engages with the second driven member 5 via the engagement member 41, and when the first driven member 4 rotates in the first direction D1, the second driven member 5 is moved to the second driven member 5. The first driven member 4 is rotated in the first direction D1 by following the rotational movement of the driven member 4.

The shape and structure of the first driven member 4 are such that it is rotatable relative to the cam member 3, and is driven by the rotational movement of the cam member 3 via the engagement member 41, and the second There is no particular limitation as long as the driven member 5 can be rotated. In this embodiment, the first driven member 4 has an engaging member 41 and a base 42 on which the engaging member 41 is provided, as shown in FIG. 1 .

The base portion 42 is a member on which the engagement member 41 is provided. The base portion 42 is rotatably supported within the housing H around the axis X so as to be rotatable relative to the cam member 3 and the second driven member 5. Further, as described above, when the first driven member 4 rotates following the cam member 3, the base portion 42 and the engagement member 41 rotate around the axis X following the cam member 3. Although the shape and structure of the base 42 are not particularly limited, in this embodiment, as shown in FIG. We are prepared. The first base portion 42a and the second base portion 42b are provided so as to sandwich the engagement member 41 in the axis X direction. The first base 42a and the second base 42b are provided as spacers so that the engagement member 41 can be rotatably sandwiched between the shaft support BR that pivotally supports a shaft 413 (described later) of the engagement member 41, They have protrusions P that protrude toward each other. The protrusions P are spaced apart from each other in the circumferential direction in the peripheral areas of the first base 42a and the second base 42b. In the space between the protrusions P spaced apart from each other, an engaging member 41 is rotatably provided by the shaft support BR. The first base portion 42a and the second base portion 42b are fixed to each other at the protruding portion P with the engaging member 41 sandwiched therebetween in the axis X direction. Further, in this embodiment, the cam member 3 is inserted into the through holes of the first base 42a and the second base 42b, and each of the first base 42a and the second base 42b is connected to the cylindrical connecting portion 32 of the cam member 3. The cam portion 31 is rotatably supported around the axis X by the outer circumferential surface of the cylindrical body 31c of the cam portion 31.

When the engaging member 41 is pressed by the cam member 3, the engaging state is engaged with the second driven member 5 (see FIG. 8), and the disengaged state is where the engagement with the second driven member 5 is released. (see FIG. 9). As shown in FIG. 5, the engaging member 41 has a claw portion 412 that engages with the engaged portion 51, and when the cam member 3 rotates in the first direction D1 or the second direction D2, the cam member 3 It has a pressing part 411 that is pressed by. The pressing portion 411 is pressed by the cam member 3 when the cam member 3 rotates in the first direction D1, and thereby enters an engaged state in which the engaging member 41 engages with the second driven member 5 (see FIG. 8). ) When the first pressing portion 411a and the cam member 3 rotate in the second direction D2, the engagement member 41 is released from engagement with the second driven member 5 by being pressed by the cam member 3. The second pressing portion 411b is in the disengaged state (see the two-dot chain line in FIG. 11). The claw portion 412 has a first engaging portion 412a that faces an engaged portion 51 of a second driven member 5, which will be described later, on the first direction D1 side, and a first engaging portion 412a that faces the engaged portion 51 on the second direction D2 side. It has a second engaging portion 412b. In the engaged state, the first engaging portion 412a engages with a short side portion 51a of an engaged portion 51, which will be described later. Further, the second engaging portion 412b faces a long side portion 51b of the engaged portion 51, which will be described later. In this embodiment, the second engaging portion 412b is configured to abut against the long side portion 51b. In addition, the second engaging part 412b may have a clearance between the long side part 51b and the long side part 51b without contacting the entire long side part 51b in the engaged state.

The mode of operation of the engagement member 41 is not particularly limited as long as it can operate between an engaged state and a disengaged state by being pressed by the cam member 3. In this embodiment, the engagement member 41 is provided in the first driven member 4 so as to rotate around a second axis X2 (see FIG. 5) parallel to the axis X. More specifically, the first driven member 4 has a shaft portion 413 that rotatably supports the engagement member 41, and the engagement member 41 rotates around the second axis X2 of the shaft portion 413 at the base portion. Rotate relative to 42. In this embodiment, the shaft portion 413 is rotatably supported by the shaft support BR in the peripheral area of the base portion 42 as described above.

The shape and structure of the engaging member 41 are not particularly limited as long as it can operate between an engaged state and a disengaged state by being pressed by the cam member 3. In this embodiment, the pressing portion 411 of the engaging member 41 extends from the shaft portion 413 toward the axis X of the cam member 3. More specifically, as shown in FIGS. 7 and 8, the pressing portion 411 presses the first cam portion 31a and the first cam portion 31a of the cam member 3 in the engaged state and the disengaged state (particularly in the disengaged state). It protrudes from the shaft portion 413 toward the axis X of the cam member 3 so as to fall within the rotation locus of the second cam portion 31b. The claw portion 412 is provided on the opposite side of the shaft portion 413 from the first pressing portion 411a and the second pressing portion 411b in the radial direction of the second driven member 5. In this embodiment, in the radial direction of the second driven member 5, when the claw portion 412 is located on the radially outer side with respect to the shaft portion 413, the pressing portion 411 is located on the radially inner side with respect to the shaft portion 413. There is. In this embodiment, when the engagement member 41 is in the disengaged state, the claw part 412 extends in the circumferential direction of the base part 42 from the shaft part 413 along the outer peripheral edge of the base part 42, and the pressing part 411 , extending from the shaft portion 413 toward the axis X. Thereby, the engaging member 41 is formed into a substantially L-shape when viewed in the second axis X2 direction. Although the number of engagement members 41 is not particularly limited, in this embodiment, a plurality of engagement members 41 are provided at predetermined intervals in the rotational direction of the first driven member 4. Thereby, the force applied to the engagement member 41 is dispersed, and the second driven member 5 is rotated stably.

Further, in this embodiment, the drive device 1 includes a spring member SP that biases the engagement member 41 in the direction of disengaging the engagement member 41, as shown in FIGS. 1 and 5. The spring member SP is not particularly limited as long as it can bias the engagement member 41 in the direction of disengaging the engagement member, but in this embodiment, it is a torsion spring. One end of the spring member SP is attached to the base 42 of the first driven member 4, and the other end of the spring member SP is attached to the engagement member 41. By urging the engagement member 41 in the direction of the disengaged state by the spring member SP, the engagement member 41 is prevented from being erroneously engaged, thereby suppressing malfunction of the drive device 1. Can be done.

The first pressing portion 411a is a portion that is pressed by the first cam portion 31a of the cam member 3 so that the engaging member 41 is in an engaged state. In the present embodiment, when the cam member 3 rotates in the first direction D1 around the axis Ru. By pressing the first pressing portion 411a by the first cam portion 31a, the engaging member 41 rotates around the second axis It engages with the engaging portion 51.

The first pressing portion 411a extends from the shaft portion 413 of the engaging member 41 toward the cam member 3 so as to be located on the rotation locus of the first cam portion 31a when the engaging member 41 is in the disengaged state. It stands out. The first pressing portion 411a is provided on one side (second direction D2 side) of the pressing portion 411 in the rotational direction of the first driven member 4. Although the first pressing portion 411a is formed as a curved surface in this embodiment, the shape of the first pressing portion 411a is not particularly limited. For example, the first pressing portion 411a may be formed in a planar shape or may have another shape.

The second pressing portion 411b is a portion that is pressed by the second cam portion 31b of the cam member 3 so that the engagement member 41 is released from engagement. In this embodiment, the second pressing part 411b comes into contact with the second cam part 31b in the rotational direction when the cam member 3 rotates in the second direction D2 around the axis Ru. By pressing the second pressing portion 411b by the second cam portion 31b, the engaging member 41 rotates around the second axis The engagement member 41 is disengaged from the engagement portion 51 and becomes disengaged.

The second pressing portion 411b moves toward the cam member 3 from the shaft portion 413 of the engaging member 41 so as to be located on the rotation locus of the second cam portion 31b when the engaging member 41 is in the engaged state. It stands out. The second pressing portion 411b is provided on the other side (first direction D1 side) of the pressing portion 411 in the rotational direction of the first driven member 4. Although the second pressing portion 411b is formed as a curved surface in this embodiment, the shape of the second pressing portion 411b is not particularly limited. For example, the second pressing portion 411b may be formed in a planar shape or may have another shape.

The claw portion 412 engages with the engaged portion 51 of the second driven member 5. As described above, the claw portion 412 is engaged with the first engaging portion 412a facing the engaged portion 51 on the first direction D1 side in the rotational direction of the first driven member 4, and the engaged portion 412a on the second direction D2 side. It has a second engaging part 412b facing the part 51. The shape and structure of the claw portion 412 are not particularly limited as long as it can come into contact with the engaged portion 51 in the first direction D1 when the engaging member 41 is in the engaged state. In this embodiment, the claw portion 412 has a tip portion 412c provided between a first engagement portion 412a and a second engagement portion 412b, as shown in FIG. More specifically, the claw portion 412 has a substantially triangular portion where the first engaging portion 412a and the second engaging portion 412b intersect at the tip portion 412c. Note that in this embodiment, the claw portion 412 and the pressing portion 411 are integrally formed, but if the claw portion 412 can operate when the pressing portion 411 is pressed by the cam member 3, the claw portion 412 and the pressing portion 411 may be formed separately. Further, in this embodiment, the tip portion 412c is formed at an acute angle, but the tip portion may be configured as a chamfered curved surface.

The first engaging portion 412a contacts the engaged portion 51 of the second driven member 5 in the first direction D1 (see FIG. 8). In this embodiment, when the cam member 3 and the first driven member 4 rotate in the first direction D1, the first engaging portion 412a engages with the short side portion 51a of the engaged portion 51, and the second The driven member 5 can be rotated in the first direction D1. In addition, in this embodiment, as will be described later, when a rotational force from the second driven member 5 side in the second direction D2 is applied to the engagement member 41, the first engagement portion 412a engages with the short side portion 51a. When engaged, rotation of the second driven member 5 in the second direction D2 is restricted.

The second engaging portion 412b faces the engaged portion 51 of the second driven member 5 (see FIG. 8). In this embodiment, as will be described later, the second engaging portion 412b is configured such that when the engaging member 41 is in the engaged state, a rotational force from the second driven member 5 side in the first direction D1 is applied to the engaging member 41. At this time, the second engaging portion 412b engages with the long side portion 51b of the engaged portion 51 to restrict rotation of the second driven member 5 in the first direction D1. In addition, the second engaging portion 412b may contact only a part of the long side portion 51b in the engaged state, and may have a clearance between the second engaging portion 412b and the long side portion 51b.

The second driven member 5 is configured to be rotatable in the first direction D1 and the second direction D2. The second driven member 5 has an engaged portion 51 with which the engaging member 41 engages, and is configured to be rotatable relative to the cam member 3 and the first driven member 4.

In this embodiment, the second driven member 5 is housed in the housing H in a rotatable state around the axis X, as shown in FIG. Specifically, the second driven member 5 is configured to rotate about the same axis as the cam member 3 and the first driven member 4. The second driven member 5 is directly or indirectly connected to the operation target OP, and the operation target OP is operated by rotating the second driven member 5.

In this embodiment, when the cam member 3 and the first driven member 4 rotate in the first direction D1, the second driven member 5 rotates in the first direction D1 in conjunction with the cam member 3 and the first driven member 4. It is configured to rotate. Further, when the cam member 3 and the first driven member 4 rotate in the second direction D2, the second driven member 5 is disengaged from the engagement member 41 and the second driven member 5 is rotated in the second direction D2. The member 5 can rotate relative to the cam member 3 and the first driven member 4.

The shape and structure of the second driven member 5 are not particularly limited as long as it is rotatable in the first direction D1 and the second direction D2 and has an engaged portion 51 described below. In this embodiment, the second driven member 5 is arranged on the radially outer side of the cam member 3 with respect to the first driven member 4, as shown in FIG. Specifically, the second driven member 5 is formed into a substantially cylindrical shape that can accommodate the cam member 3 and the first driven member 4 inside (see FIG. 1), and the second driven member 5 has a substantially cylindrical shape. A plurality of engaged portions 51 are formed along the circumferential direction of the inner circumferential surface. More specifically, as shown in FIG. 1, the second driven member 5 has a substantially cylindrical main body 5a and an end wall 5b provided on one side of the main body 5a in the axis X direction. . The other side of the main body 5a in the axis X direction is open. The end wall 5b is provided with a bearing portion B on which the shaft portion 33 of the cam member 3 is supported. In this embodiment, the bearing portion B is a through hole formed in the end wall 5b. A gear G that meshes with the transmission member 7 is provided on the outer surface of the end wall 5b of the main body 5a. The gear G meshes with teeth on the outer periphery of the transmission member 7. A shaft member Ax is connected to the transmission member 7, and the shaft member Ax rotates as the transmission member 7 rotates. The shaft member Ax is connected to the winding section 6 and serves as a rotating shaft of the winding section 6. In this embodiment, when the second driven member 5 rotates in the first direction D1 in conjunction with the cam member 3 and the first driven member 4, the gear G, the transmission member 7, and the winding part 6 rotate, and the long It is configured to wind up the member OP onto a winding section 6.

The engaged portion 51 engages with the claw portion 412 . The shape and structure of the engaged portion 51 are not particularly limited as long as it can engage with the claw portion 412. In the present embodiment, the engaged portion 51 is formed in the shape of a ratchet tooth on the inner peripheral surface facing the outer circumference of the first driven member 4 . When the claw portion 412 is engaged with the engaged portion 51, the short side portion 51a provided on the first direction D1 side with respect to the claw portion 412, and the radially outer end of the short side portion 51a. It has a long side portion 51b extending in the second direction D2 (via the bottom portion 51c). In this embodiment, the engaged portion 51 has a bottom portion 51c where the tip portion 412c is located between the short side portion 51a and the long side portion 51b. More specifically, in the present embodiment, the engaged portion 51 is an engagement recess corresponding to the shape of the claw portion 412, which is continuously formed in a ratchet tooth shape on the inner peripheral surface of the second driven member 5. It is. In this embodiment, the engaged portion 51 is configured as a substantially triangular engagement recess such that the bottom portion 51c is the intersection of the short side portion 51a and the long side portion 51b. In addition, the short side part 51a and the long side part 51b may be curved or may be planar.

The short side portion 51a engages with the first engaging portion 412a of the claw portion 412. In this embodiment, the short side portion 51a engages with the first engaging portion 412a when the cam member 3 and the first driven member 4 rotate in the first direction D1, as shown in FIG. Thereby, the second driven member 5 can rotate in the first direction D1 as the cam member 3 and the first driven member 4 rotate in the first direction D1. In addition, in this embodiment, as will be described later, when the claw portion 412 is in the engaged state, the short side portion 51a is affected by the rotational force applied to the engagement member 41 from the second driven member 5 in the second direction D2. At this time, the second driven member 5 is engaged with the first engaging portion 412a to restrict rotation of the second driven member 5 in the second direction D2.

The long side portion 51b faces the second engaging portion 412b of the claw portion 412. In this embodiment, when the first pressing portion 411a of the engagement member 41 is pressed by the cam member 3 and the engagement member 41 moves to the engaged state, the long side portion 51b is at least A portion thereof is configured to come into contact with the second engaging portion 412b. Further, as described later, when the second driven member 5 is about to rotate in the first direction D1 in the engaged state of the engaging member 41, the long side portion 51b engages with the second engaging portion 412b. Thus, rotation of the second driven member 5 in the first direction D1 may be restricted.

In the drive device 1 of this embodiment, as described above, the cam member 3 includes the first cam portion 31a and the second cam portion 31b. Further, in the drive device 1, when the cam member 3 rotates in the first direction D1, the pressing portion 411 of the engaging member 41 is pressed by the first cam portion 31a of the cam member 3, so that the engaging member 41 is in an engaged state where it engages with the second driven member 5, and when the cam member 3 rotates in the second direction D2, the engaging member is pressed by the cam member 3. 41 has a second pressing portion 411b that is in a disengaged state where engagement with the second driven member 5 is released. Therefore, the drive device 1 of this embodiment engages the engaging member 41 operated by the cam member 3 with the engaged part 51 by rotating the cam member 3 in both directions by the driving force of the driving part 2. state and disengaged state.

More specifically, in this embodiment, as shown in FIGS. 7 and 8, when the cam member 3 rotates in the first direction D1, the first position of the engaging member 41 in the disengaged state The pressing portion 411 a is pressed by the first cam portion 31 a of the cam member 3 and rotates around the shaft portion 413 so that the claw portion 412 of the engaging member 41 engages with the engaged portion 51 . Thereby, by rotating the cam member 3 in the first direction D1 by the driving part 2, the claw part 412 of the engaging member 41 engages with the engaged part 51, and the cam member 3 is rotated in the first direction D1. The rotation is transmitted to the first driven member 4 and the second driven member 5, and the second driven member 5 can be rotated. Further, as shown in FIG. 11, when the cam member 3 rotates in the second direction D2, the second pressing portion 411b of the engaging member 41 in the engaged state is moved to the second cam portion of the cam member 3. 31b, the claw portion 412 of the engaging member 41 rotates around the shaft portion 413 so as to be disengaged from the engaged portion 51. Thereby, by rotating the cam member 3 in the second direction D2 by the drive unit 2, the claw portion 412 of the engaging member 41 rotates about the shaft portion 413 toward the disengaged state, and the engaged member It comes off from section 51. Therefore, even if the claw portion 412 and the engaged portion 51 are engaged, the engagement can be easily released using the driving force of the driving portion 2.

In this embodiment, as shown in FIGS. 7 and 8, when the cam member 3 rotates in the first direction D1, the engaging member 41 engages with the engaged portion 51, and the first driven member 4 and the second driven member 5 rotate in conjunction with the first direction D1, and the second driven member 5 rotates in the first direction D1, so that the elongated member OP is wound up and turned into the elongated member OP. The object to be fixed (wheelchair) WC is fixed under tension (see FIG. 3). In order to release the tension applied to the elongated member OP in this way, when the cam member 3 rotates in the second direction D2, the engagement member 41 moves the second driven member 5 in the first direction D1. While slightly rotating, the engaging member 41 is moved to the disengaged state (see the two-dot chain line in FIG. 11). As a result, the second driven member 5 can rotate relative to the first driven member 4, and the fixed state of the fixed object WC is released.

In order to bring the engagement member 41 into the disengaged state when tension is applied to the elongated member OP as described above, move the claw portion 412 of the engagement member 41 away from the position shown by the solid line in FIG. It is necessary to rotate it to the position shown by the dotted chain line. At this time, unless the second driven member 5 is slightly rotated in the first direction D1 by the claw portion 412 of the engagement member 41, the engagement member 41 will not be brought into the disengaged state. The rotation of the second driven member 5 in the first direction D1 is a rotation direction in which tension is applied to the elongated member OP. Therefore, in the case of the structure of Patent Document 2 mentioned above, in which the engagement is released by the biasing force of the spring, the second driven member 5 cannot be rotated in the first direction D1. On the other hand, in this embodiment, the cam member 3 is rotated by the drive section 2 not only when the engaging member 41 is brought into the engaged state but also when brought into the disengaged state. By pressing , the engagement is released. Therefore, when removing the elongated member OP from the fixed object WC, it is necessary to rotate the second driven member 5 in the first direction D1, which is the direction in which tension is applied to the elongated member OP (the direction in which the elongated member OP is pulled). Even if there is, the fixed state of the fixed target WC can be easily released by rotating the cam member 3 with the driving force of the drive unit 2 and bringing the engagement member 41 into the disengaged state.

Further, in the present embodiment, when the cam member 3 presses the first pressing portion 411a, the claw portion 412 is in contact with the short side portion 51a and the long side portion 51b, and the claw portion 412 is in contact with the second driven member 5. It is configured to apply a force to the second driven member 5 that includes the radially outer direction in the directional component and restricts the relative rotation of the second driven member 5 with respect to the first driven member 4 in both directions. In this case, as shown in FIG. 10, when the cam member 3 presses the first pressing part 411a of the engaging member 41, the second engaging part 412b of the claw part 412 of the engaging member 41 presses the long side part 51b. Press. The force F with which the second engaging portion 412b presses the long side portion 51b includes a component force F1 in the radially outward direction of the second driven member 5, as shown in FIG. Even if an external force is applied to rotate the second driven member 5 in the first direction D1, the force generated in the claw portion 412 directed outward in the radial direction causes the engagement member 41 to move to the disengagement position. The force from the driven member 5 can be countered. Therefore, rotation of the second driven member 5 in the first direction D1 is suppressed. Further, when a force to rotate the second driven member 5 in the second direction D2 is generated, when the cam member 3 presses the first pressing part 411a, the first engaging part 412a moves the short side part 51a to the second direction D2. Since it is pressed in the direction D2, rotation of the second driven member 5 in the second direction D2 is also restricted. Therefore, in the drive device 1 of the present embodiment, even if an external force is applied to the second driven member 5 operated by the driving force of the drive unit 2, the rotation of the second driven member 5 in the first direction D1 and the second direction D2 is prevented. is regulated, and the second driven member 5 can be held in the position after the operation.

Next, the effects of the drive device 1 of this embodiment will be explained in more detail using an example in which the drive device 1 is applied to a wheelchair fixing device. Note that the following explanation is just an example, and the present invention is not limited by the following explanation.

First, as shown in FIG. 3, the elongated member OP is connected to the wheelchair WC that has been moved into the vehicle. Specifically, by pulling the elongated member OP, the elongated member OP is let out from the winding section 6 of the drive device 1, and as shown in FIG. 3, the hook OP2 is hooked onto the frame of the wheelchair WC. At this time, the drive unit 2 is not driven, the engagement member 41 is in the disengaged state shown in FIG. 7, and the second driven member 5 is rotated in the first direction D1 and the second direction D2. is possible. Therefore, as the elongated member OP is fed out, the winding section 6 rotates, and as the winding section 6 rotates, the second driven member 5 is moved in the second direction D2 via the shaft member Ax and the transmission member 7. Rotate to.

When a predetermined number of elongated members OP are connected to the wheelchair WC, an operation section such as a switch (not shown) is operated in order to drive the drive section 2. When the drive unit 2 is driven by the operation unit, the cam member 3 is rotated in the first direction D1 (counterclockwise in FIG. 7) by the driving force of the drive unit 2. When the cam member 3 rotates in the first direction D1, the first cam portion 31a of the cam member 3 presses the first pressing portion 411a of the engagement member 41. Thereby, the engagement member 41 rotates clockwise around the second axis X2. When the engagement member 41 rotates, the second engagement portion 412b of the engagement member 41 comes into contact with the long side portion 51b of the second driven member 5. When the cam member 3 is rotated as it is, the entire first driven member 4 including the engagement member 41 and the base 42 rotates in the first direction D1 with respect to the second driven member 5. As a result, as shown in FIG. 8, the tip portion 412c of the claw portion 412 of the engaging member 41 moves to the position of the bottom portion 51c of the engaged portion 51 of the second driven member 5. Then, the first engaging portion 412a engages with the short side portion 51a, and the engaging member 41 becomes engaged with the second driven member 5.

When the cam member 3 is further rotated, the cam member 3, the first driven member 4, and the second driven member 5 rotate in the first direction D1 (counterclockwise in FIG. 8) in conjunction with each other. As a result, the winding section 6 connected to the second driven member 5 via the gear G, the transmission member 7, and the shaft member Ax rotates, and the elongated member OP is wound up on the winding section 6 (Fig. 1 , see Figures 2 and 4). When the elongated member OP is wound up by the winding section 6, the wheelchair WC is stably held within the vehicle by being pulled by the plurality of elongated members OP from a predetermined direction.

The cam member 3, first driven member 4, and second driven member 5 of the drive device 1 are stopped in the engaged state shown in FIGS. 8 and 10. In this state, in order to stably hold the wheelchair WC, it is necessary to prevent the plurality of elongated members OP connected to the wheelchair WC from being pulled out or wound up. In this embodiment, as shown in FIG. 8, the elongated member OP is not pulled out due to the engagement between the engaging member 41 and the engaged portion 51, and as shown in FIG. By fixing the wheelchair WC in a state where tension is applied to the elongated member OP, the elongated member OP is prevented from being wound up. Further, as described above, when the second engaging portion 412b is configured to apply the force F that presses the second engaged portion 51b, as shown in FIG. 10, the second driven member It includes a component force F1 whose directional component includes the radially outer direction of No.5. Even if an external force is applied to rotate the second driven member 5 in the first direction D1, the radially outward component force F1 generated in the claw portion 412 causes the engagement member 41 to move to the disengagement position. The force from the two driven members 5 can be countered. Therefore, rotation of the second driven member 5 in the first direction D1 is suppressed. Further, when the drive unit 2 is stopped, the cam member 3 is stopped at the position shown in FIGS. 8 and 10, so that the engagement member 41 is moved from the second driven member 5 in the second direction D2. Even if a force is applied to the first pressing portion 411a of the engaging member 41 and the first cam portion 31a of the cam member 3, the rotation of the second driven member 5 in the second direction D2 is suppressed. do.

In addition, when a force to rotate the second driven member 5 in the second direction D2 is generated, when the cam member 3 is pressing the first pressing portion 411a, the first engaging portion 412a presses the short side portion 51a. Since it is pressed, rotation of the second driven member 5 in the second direction D2 is also restricted. In this embodiment, the length L1 from the shaft portion 413 of the first driven member 4 to the tip end 412c of the claw portion 412 is the length L1 from the shaft portion 413 of the first driven member 4 to the bottom portion 51c of the engaged portion 51. (see FIG. 10). Therefore, even if a force for rotating the second driven member 5 in the second direction D2 is applied and the engagement member 41 attempts to rotate clockwise from the position shown in FIG. The bottom portion 51c of the engaging portion 51 is caught, and the rotation of the second driven member 5 in the second direction D2 is further restricted (when the engaging member 41 rotates clockwise, the direction indicated by the two-dot chain line in FIG. 10 Although the state shown is reached, the bottom portion 51c of the engaged portion 51 only moves on the broken line DL in FIG. 10, so the engaging member 41 cannot rotate clockwise).

As described above, in the drive device 1 of this embodiment, the second driven member 5 is restricted from rotating in the first direction D1 and the second direction D2 because the engagement member 41 is in the engaged state. . Therefore, both the unwinding and winding of the elongated member OP connected to the wheelchair WC from the winding section 6 are regulated, and the wheelchair WC is stably held.

In addition, when removing the elongate member OP from the wheelchair WC, the operating section is operated to drive the drive section 2 in the opposite direction. When the drive unit 2 is driven in the opposite direction, the cam member 3 rotates in the second direction D2 (clockwise in FIG. 8). When the cam member 3 rotates in the second direction D2, the second pressing portion 411b of the engagement member 41 is pressed by the second cam portion 31b of the cam member 3, as shown in FIGS. 9 and 11. As a result, the engagement member 41 rotates counterclockwise around the second axis X2, as shown by the two-dot chain line in FIG. When the engagement member 41 rotates, the claw portion 412 of the engagement member 41 is disengaged from the engaged portion 51 of the second driven member 5, as shown in FIG. 9, and the engagement is released. As described above, in this embodiment, by rotating the cam member 3 in both directions by the driving force of the driving part 2, the engaging member 41 operated by the cam member 3 can be easily engaged with the engaged part 51. It can be in an engaged state and a disengaged state.

When the engagement member 41 is brought into the disengaged state, the cam member 3 rotates in the second direction D2 (clockwise in FIG. 8) from the state shown in FIG. When the second driven member 5 is separated from the engagement member 41, the force for rotating the second driven member 5 in the first direction D1 is weakened, and the tension applied to the elongated member OP is slightly reduced. However, a force is still applied to the second driven member 5 from the elongated member OP in the second direction D2 (or when the second driven member 5 is rotated in the first direction D1, the force is applied from the elongated member OP in the second direction D2). force is added to D2). As shown in FIG. 11, the cam member 3 rotates in the second direction D2, the second cam portion 31b of the cam member 3 presses the second pressing portion 411b of the engagement member 41, and the engagement member 41 When rotating counterclockwise around the second axis X2, it is necessary to rotate the second driven member 5 in the first direction D1 against the force in the second direction D2 from the elongated member OP mentioned above. . In this embodiment, the engagement member 41 is rotated to the disengaged state by the cam member 3 using the driving force of the drive unit 2 . Therefore, even if it is necessary to rotate the second driven member 5 in the first direction D1, which is the direction in which tension is applied to the elongated member OP, when removing the elongated member OP from the fixed object WC, the drive unit 2 By rotating the cam member 3 using the driving force and disengaging the engagement member 41, the fixed state of the fixed object WC can be easily released.

When the engagement member 41 is in the disengaged state, the second driven member 5 can rotate relative to the first driven member 4. In this state, the elongated member OP can be removed from the frame of the wheelchair WC by slightly pulling it. After the elongated member OP is removed from the wheelchair WC, the elongated member OP is wound up by the winding portion 6 which is spring-biased in the direction of winding up the elongated member OP. Thereby, removal of the elongated member OP is completed, and the wheelchair WC can be moved from the vehicle.

<Second embodiment>
Next, a driving device according to a second embodiment will be explained using FIGS. 12 to 14. Note that in the following description, descriptions of matters common to the above-described embodiments will be omitted, and differences will be focused on. Note that the configuration of this embodiment and the content described in the first embodiment can be used in combination.

As shown in FIGS. 12 to 14, in this embodiment, the short side portion 51a of the engaged portion 51 connects the radially outer end E1 of the short side portion 51a and the axis X of the cam member 3. It extends obliquely in a region on the first direction D1 side with respect to the straight line LN. That is, in the first embodiment, the short side portion 51a extends in the second direction D2 side with respect to the straight line LN, whereas in the present embodiment, the short side portion 51a extends in the first direction D1 side with respect to the straight line LN. It extends into the area of In the present embodiment, as shown in FIGS. 12 to 14, the short side portion 51a is radially inward from the radially outer end E1 of the short side portion 51a, and the distance between the short side portion 51a and the straight line LN is It extends at an angle so that it becomes larger. Note that when the short side 51a and the long side 51b intersect at an acute angle, the radially outer end E1 of the short side 51a is the intersection between the short side 51a and the long side 51b. It can be a part. Further, as in the present embodiment, when the intersection portion (bottom portion 51c) of the short side portion 51a and the long side portion 51b is curved and connected gently, the boundary between the curved portion and the short side portion 51a It can be a location. In this embodiment, like the short side portion 51a, the first engaging portion 412a that engages with the short side portion 51a is inclined in the region on the first direction D1 side with respect to the straight line LN in the engaged state. It is extending.

Since the short side portion 51a extends obliquely in the region on the first direction D1 side with respect to the straight line LN, the cam member 3 can be rotated in the second direction D2, and the engaging member 41 can be moved to the engaged portion. 51, it is difficult for the force from the radially inner component to be applied from the first engaging part 412a to the short side part 51a, and the engaging member 41 is less likely to be caught on the engaged part 51 (the engaging member 41 is 413), the second driven member 5 is easily rotated in the first direction D1. As described above, in order to remove the claw portion 412 of the engaging member 41 from the engaged portion 51, force is applied to the short side portion 51a from the first engaging portion 412a of the claw portion 412 facing the short side portion 51a. In addition, it is necessary to rotate the second driven member 5 slightly in the first direction D1. At this time, since the short side portion 51a is inclined in the region on the first direction D1 side with respect to the straight line LN, when the engagement member 41 rotates to the disengaged state, the short side portion 51a It is difficult to get caught, and the force applied from the claw portion 412 to the short side portion 51a makes it easier to rotate the second driven member 5 in the first direction D1. Therefore, the problem that the claw portion 412 is caught on the short side portion 51a within the engaged portion 51 and cannot be moved to the disengaged state without coming off from the engaged portion 51 is suppressed.

Further, in this embodiment, in order for the engagement member 41 to enter the disengaged state, the engagement member 41 needs to move from the state shown by the solid line to the position shown by the two-dot chain line in FIG. Therefore, the tip portion 412c of the claw portion 412 follows the trajectory T in FIG. As the distal end portion 412c of the claw portion 412 moves along the trajectory T in this manner, the second driven member 5 moves the radially inner end E2 of the short side portion 51a in the first direction at a predetermined rotation angle. Move to D1 (see position E21 in FIG. 14). Also in the case of the first embodiment, when the engagement member 41 moves from the engaged state to the disengaged state, the second driven member 5 rotates, and the tip 412c of the claw portion 412 moves along the trajectory T. At this time, the radially inner end E2 of the short side portion 51a moves in the first direction D1 at a predetermined rotation angle, and moves to the position E22 in FIGS. 10 and 11. As can be seen from the position of the end E21 after movement in FIG. 14 and the position of the end E22 after movement in FIGS. 10 and 11, in this embodiment, the short side 51a is the first By extending at an angle in the direction D1, the engagement member 41 is more easily engaged than in the first embodiment (see FIG. 10) in which it extends in a region on the second direction D2 side with respect to the straight line LN. The rotation angle of the second driven member 5 when entering the released state can be made smaller. Therefore, even if it is difficult to rotate the second driven member 5 in the first direction D1, such as when a force is applied from the elongated member OP to the second driven member 5 in the second direction D2, the engagement member 41 can be easily moved to the disengaged state.

The angle θ (hereinafter referred to as inclination angle θ) between the straight line LN and the straight line connecting the radially outer end E1 of the short side 51a and the radially inner end E2 of the short side 51a is , there is no particular limitation as long as the short side portion 51a extends obliquely in the region on the first direction D1 side with respect to the straight line LN. For example, the inclination angle θ of the short side portion 51a may be 3 to 35°. By setting the inclination angle θ of the short side portion 51a to 3 to 35 degrees, when the engagement member 41 rotates to the disengaged state, it is difficult to get caught on the short side portion 51a, and the short side portion 51a is easily removed from the claw portion 412. The force applied thereto makes it easier to rotate the second driven member 5 in the first direction D1. Further, it is more preferable that the inclination angle θ is 15 to 35 degrees. By setting the inclination angle θ to 15 to 35 degrees, the second driven member 5 is less likely to be caught on the short side portion 51a, and the second driven member 5 can be easily rotated in the first direction D1 by the force applied from the claw portion 412 to the short side portion 51a. Moreover, the rotation angle of the second driven member 5 in the first direction D1 when the engagement member 41 is moved to the disengaged state can be made smaller.

Furthermore, in this embodiment, the short side portion 51a has a recess CV in the central region of the short side portion 51a, as shown in FIG. The short side portion 51a is coated with grease that enhances the slidability between the short side portion 51a and the first engaging portion 412a facing the short side portion 51a, and the grease is stored in the recess CV. Therefore, the slidability between the short side portion 51a and the first engaging portion 412a can be improved, and the operation when the engaging member 41 changes from the engaged state to the disengaged state can be made smooth. can.

1 Drive device 2 Drive part 21 Motor 22 Output shaft 3 Cam member 31 Cam part 31a First cam part 31b Second cam part 31c Cylindrical body 32 Connection part 32a Fitting part 33 Shaft part 4 First driven member 41 Engagement member 411 Pressing part 411a First pressing part 411b Second pressing part 412 Claw part 412a First engaging part 412b Second engaging part 412c Tip part 413 Shaft part 42 Base part 42a First base part 42b Second base part 5 Second driven member 5a Main body 5b End wall 51 Engaged part 51a Short side part 51b Long side part 51c Bottom part 6 Winding part 7 Transmission member Ax Shaft member B Bearing part BR Shaft support C Cam CV Recessed part D Wheelchair fixing device D1 First direction D2 Second Direction E1 Radially outer end of the short side E2 radially inner end of the short side E21, E22 radially inner end of the short side after movement G Gear H Housing L1 Shaft of engagement member L2 The shortest distance from the shaft of the engaging member to the bottom of the engaged part LN The straight line connecting the radially outer end of the short side and the axis of the cam member OP Operation target (long member)
OP1 Belt OP2 Hook P Projection SP Spring member T Trajectory along which the tip of the claw moves WC Wheelchair (fixed target)
X axis X2 second axis

Claims (6)

A drive unit;
a cam member that rotates in a first direction and a second direction opposite to the first direction by a driving force of the driving section;
a first driven member that has an engagement member that operates by rotation of the cam member and is rotatable relative to the cam member;
The engaging member has an engaged portion that engages, and includes a second driven member that is rotatable relative to the cam member and the first driven member,
The engaging member has a claw portion that engages with the engaged portion, and a pressing portion that is pressed against the cam member when the cam member rotates in the first direction or the second direction. death,
The pressing portion is configured to be pressed by the cam member when the cam member rotates in the first direction, thereby bringing the engaging member into an engaged state where the engaging member engages with the second driven member. a disengaged state in which the engagement member is disengaged from the second driven member by being pressed by the cam member when the pressing portion and the cam member rotate in the second direction; and a second pressing part,
The cam member includes a first cam portion that brings the engaging member into an engaged state by pressing a first pressing portion of the engaging member, and a first cam portion that brings the engaging member into an engaged state by pressing a second pressing portion of the engaging member. A drive device having a second cam portion that is brought into a disengaged state,
The drive device includes a winding section where the elongated member is wound up and unwound,
The elongated member is wound up and unwound by the rotation of the second driven member in the first direction and the second direction,
The driving device is configured to engage one end of the elongated member with a fixed object and wind up the elongated member to fix the fixed object,
When the cam member rotates in the first direction, the engaging member engages with the engaged portion, and the first driven member and the second driven member move in the first direction. rotate,
When the second driven member rotates in the first direction, the elongated member is wound up, and the object to be fixed is fixed in a state where tension is applied to the elongated member,
When the cam member rotates in the second direction, the engaging member moves to a disengaged state while slightly rotating the second driven member in the first direction. , the second driven member becomes rotatable relative to the first driven member, and the fixed state of the fixed object is released;
Drive device. The first driven member has a shaft portion that rotatably supports the engagement member,
The pressing portion extends from the shaft portion toward the shaft of the cam member,
When the cam member rotates in the first direction, the first pressing portion of the engaging member in the disengaged state is pressed by the first cam portion of the cam member, and the first pressing portion of the engaging member in the disengaged state is pressed by the first cam portion of the cam member. The claw portion of the mating member rotates around the shaft portion so as to engage with the engaged portion,
When the cam member rotates in the second direction, the second pressing portion of the engaging member in the engaged state is pressed by the second cam portion of the cam member, causing the engaging The drive device according to claim 1, wherein the claw portion of the member rotates around the shaft portion such that the claw portion is disengaged from the engaged portion. The second driven member is disposed radially outward of the cam member with respect to the first driven member,
The engaged portion of the second driven member is formed in a ratchet tooth shape on the inner circumferential surface facing the outer circumference of the first driven member, and the ratchet tooth shaped engaged portion is formed on the inner peripheral surface facing the outer circumference of the first driven member. a short side portion provided on the first direction side with respect to the claw portion when the claw portion is engaged with the engaged portion; and a radially outer end of the short side portion. and a long side extending in the second direction from
The short side portion of the engaged portion extends obliquely in a region on the first direction side with respect to a straight line connecting the radially outer end of the short side portion and the axis of the cam member. The drive device according to claim 1 or 2. A straight line connecting the radially outer end of the short side and the axis of the cam member, and a straight line connecting the radially outer end of the short side and the radially inner end of the short side. The drive device according to claim 3, wherein the angle formed by the elliptical line is 3 to 35°. The claw portion of the engaging member includes a first engaging portion that engages with the short side portion in the engaged state,
In the engaged state, the first engaging portion is inclined in a region on the first direction side with respect to a straight line connecting the radially outer end of the short side portion and the axis of the cam member. 5. A drive device according to claim 3, wherein the drive device is elongated. The second driven member is disposed radially outward of the cam member with respect to the first driven member,
The engaged portion of the second driven member is formed in a ratchet tooth shape on the inner circumferential surface facing the outer circumference of the first driven member, and the ratchet tooth shaped engaged portion is formed on the inner peripheral surface facing the outer circumference of the first driven member. a short side portion provided on the first direction side with respect to the claw portion when the claw portion is engaged with the engaged portion; and a radially outer end of the short side portion. and a long side extending in the second direction from
The claw portion has a first engaging portion that comes into contact with the short side portion, and a second engaging portion that comes into contact with the long side portion,
When the cam member presses the first pressing portion, the pawl portion is in contact with the short side portion and the long side portion, and the claw portion has a radially outward direction of the second driven member as a direction component. The drive device according to any one of claims 1 to 5, further comprising: applying a force to the second driven member to restrict relative rotation of the second driven member in both directions with respect to the first driven member.

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