WO2013035556A1

WO2013035556A1 - Flap drive device

Info

Publication number: WO2013035556A1
Application number: PCT/JP2012/071468
Authority: WO
Inventors: 堀口　賢治
Original assignee: トヨタ車体株式会社
Priority date: 2011-09-05
Filing date: 2012-08-24
Publication date: 2013-03-14
Also published as: JP5751099B2; CN103732447A; JP2013052761A; CN103732447B

Abstract

The flap drive device is provided with a torque-transmitting member (56) that can transmit a torque input from a rotational drive source (55) of a flap (21) to the flap and rotate the flap. The torque-transmitting member has an input section (562) configured so as to be capable of rotating as a unit with the output shaft (55k) of the flap rotational drive source, and an output section (564) configured so as to be capable of rotating as a unit with the flap. The torque-transmitting member is configured so that when a torque exceeding a torque of a prescribed magnitude is applied between the input section and the output section, relative rotation of the input section and the output section is possible.

Description

Flapper drive unit

The present invention relates to a flapper drive device.

Japanese Patent Application Laid-Open No. 2003-341409 discloses a driving device that rotates a flapper installed at a rear end edge of a platform of a wheelchair lifter for a vehicle between an upright position and a lying down position. As shown in FIGS. 10A and 10B, the driving apparatus 100 includes a motor-side sprocket 102 attached to an output shaft (not shown) of a motor, a flapper-side sprocket 104 provided on a rotating shaft portion of the flapper 110, And a chain 105 hung on both the

sprockets

102 and 104. Further, a lock mechanism 107 is provided between the flapper-side sprocket 104 and the flapper 110 to lock the flapper 110 in an upright position.

The lock mechanism 107 is configured to be able to release the locked state by manually operating the lock release lever 108 (see FIG. 10B). Further, the lock mechanism 107 is configured so that the locked state is automatically released when the flapper side sprocket 104 rotates in the falling direction of the flapper 110 by the rotational force (torque) of the motor.
When the motor is started, the rotational force of the motor is transmitted to the flapper 110 via the motor-side sprocket 102, the chain 105, and the flapper-side sprocket 104, and the lock mechanism 107 is released to lock the flapper 110 in the standing position and the lying position. Can be rotated between the two.

In addition, even when the motor is stopped, the lock mechanism 107 is unlocked by the lock release lever 108, so that the flapper 110 can be manually rotated between the standing position and the lying position. At this time, manual rotation force of the flapper 110 is applied to the motor via the flapper side sprocket 104, the chain 105, and the motor side sprocket 102, and the motor is rotated by external force.

As described above, in the flapper driving device, when the flapper 110 is manually rotated between the standing position and the lying position, the rotational force of the flapper 110 causes the flapper side sprocket 104, the chain 105, and the motor side sprocket 102 to rotate. And the motor is rotated by an external force. For this reason, during manual operation of the flapper 110, a rotating sound of the motor, a meshing sound between the

sprockets

102 and 104 and the chain 105, etc. are generated, which is annoying. Further, it is necessary to secure a large storage space between the

sprockets

102 and 104 and the chain 105, and the degree of freedom of arrangement of the

sprockets

102 and 104 and the like is reduced.

In order to improve this point, the rotary drive source is composed of a motor and a speed reducer that do not have the

sprockets

102 and 104 and the chain 105, and the output shaft is rotationally locked when the motor is de-energized. It is conceivable to use a rotational drive source. However, when the output shaft of the rotational drive source is locked when the energization is released, a mechanism for mechanically separating the output shaft of the rotational drive source and the flapper 110 is required to manually rotate the flapper 110. However, when manually rotating the flapper 110, if the operation of manually separating the output shaft of the rotation drive source from the flapper 110 in addition to the operation of manually releasing the standing lock state of the flapper 110 is necessary, Handling of the driving device 100 becomes complicated.

As one aspect of the present invention, a flapper drive device rotates a flapper that is installed on an end edge of a lifter platform so as to be rotatable between a standing position and a lying position. A torque transmission member is provided that can transmit torque input from the dynamic drive source to the flapper to rotate the flapper. The rotational force transmission member has an input unit configured to be rotatable integrally with an output shaft of a rotation drive source of the flapper, and an output unit configured to be rotatable integrally with the flapper. The input unit and the output unit When a torque exceeding a predetermined magnitude is applied during the period, the input unit and the output unit can be rotated relative to each other.

According to this, the rotational force transmitting member can transmit the torque input from the rotational drive source to the input unit to the flapper to rotate the flapper. That is, when the rotation drive source of the flapper operates and the output shaft rotates, torque is transmitted from the output shaft of the rotation drive source to the flapper via the input portion and the output portion of the rotational force transmission member. As a result, the flapper can be electrically rotated between the standing position and the lying position.

Also, when a torque exceeding a predetermined magnitude is applied between the input unit and the output unit, the input unit and the output unit can be rotated relative to each other. For this reason, in a state where the rotation drive source of the flapper is stopped and the output shaft is locked, the input part of the rotational force transmitting member is manually applied to the flapper with a rotational force exceeding a predetermined magnitude of torque. And the output section rotate relative to each other. That is, the flapper can be manually rotated.

As described above, when the flapper is manually rotated while the output shaft of the rotation drive source of the flapper is locked, it is not necessary to release the connection state between the flapper and the output shaft of the rotation drive source. Manual operation of the flapper is not complicated. Further, since the flapper can be manually rotated while the output shaft of the rotation drive source is locked, no rotating sound, meshing sound, etc. are generated during manual operation of the flapper.

It is a model perspective view of a wheelchair lifter provided with the drive device of the flapper concerning the form for carrying out the present invention. 1 is an overall side view of a flapper drive device according to an embodiment. FIG. 3 is a cross-sectional view taken along the line III-III of the drive device of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of the drive device of FIG. 2. FIG. 5 is a VV arrow view of the drive device of FIG. 4. FIG. 4 is a VI-VI arrow view of the drive device of FIG. 3. FIG. 4 is a VII-VII arrow view of the drive device of FIG. 3. It is a side view showing a mode that the rotation lock state of a flapper is cancelled | released in the drive device of a flapper. It is a side view showing the middle of rotation of a flapper in a flapper drive device. It is a side view in the standing lock state of the flapper in the conventional drive device. It is a side view showing the standing lock release state of the conventional flapper.

A flapper driving device according to an embodiment of the present invention will be described with reference to FIGS. The flapper drive device according to the present embodiment is a device for rotating a flapper installed on a wheelchair lifter platform provided at the rear of the one-box vehicle C.

Here, the outline of the wheelchair lifter 10 will be briefly described before the description of the flapper drive device 50 according to the present embodiment. Note that the front, rear, left, right, and top and bottom shown in the figure correspond to the front, back, left, right, and top and bottom of a one-box vehicle C equipped with a wheelchair lifter.

[Outline of wheelchair lifter]
As shown in FIG. 1, the one-box vehicle C includes a rear opening H, and the rear opening H is configured to be openable and closable by a vertically rotating back door (not shown). A wheelchair lifter 10 is provided at the rear of the one-box vehicle C to allow an occupant to get on and off from the rear opening H with the wheelchair K.

The wheelchair lifter 10 includes a horizontal platform 20 on which the wheelchair K is placed, a pair of left and right front / rear slide mechanisms 30 that slide the platform 20 back and forth, and a pair of left and right lift links 40 that raise and lower the platform 20 in a horizontal state. It has.

The elevating link mechanism 40 includes a four-bar link mechanism 43 connected to the left and right fixing brackets 41 of the passenger compartment floor FL in a state in which the elevating link mechanism 40 can be rotated up and down, and the vertical link mechanism 40 is also turned up and down at the tip side of the four-bar link mechanism 43. An elevating lifting / lowering arm 44 connected in a possible state and a hydraulic cylinder (not shown) that moves the four-bar linkage mechanism 43 up and down to move the lifting / lowering arm 44 up and down.

The platform 20 is connected to the lower end portions of the left and right lifting arms 44 through a front / rear slide mechanism 30 in a state in which the platform 20 can slide back and forth. The front / rear slide mechanism 30 includes a slide rail 35 provided on the left and right side surfaces of the platform 20 and a slide mechanism main body 33 that slides the slide rail 35 in the vehicle front-rear direction.

The platform 20 is formed in a rectangular shape that is long in the front-rear direction, and a plate-like flapper 21 is installed on the rear end edge of the platform 20 so as to be rotatable up and down. The flapper 21 is a member that is used as a slope plate that eliminates a step between the platform 20 and the ground when the platform 20 is at the landing position on the ground. The flapper 21 is configured to be rotatable between a lying position when used as a slope plate and a standing position, and functions as a stopper that supports the rear wheel of the wheelchair K from the rear in the standing position.

[Overview of flapper drive unit]
The flapper drive device 50 is a device that rotates the flapper 21 between a standing position and a lying position, and as shown in FIG. 1, the left slide rail 35 in the front and rear slide mechanism 30 in a state of being housed in the housing 51. It is installed inside the vehicle width direction. As shown in FIG. 2 and the like, the flapper drive device 50 includes a motor unit 52, a gear mechanism 54, a disk damper 56, and a lock mechanism 58 (see FIG. 3 and the like) used as a rotational drive source of the flapper 21. And.

[Motor and gear mechanism]
As shown in FIG. 2, the motor unit 52 includes a motor 52m and a speed reducer 52x. When the motor 52m is de-energized and the motor 52m is stopped, the output shaft 52j of the speed reducer 52x is rotationally locked. It is comprised so that. The motor unit 52 is positioned such that the output shaft 52j of the motor unit 52 extends in the vehicle width direction, and a pinion gear 52p is fixed to the output shaft 52j of the motor unit 52. The pinion gear 52 p meshes with the idle gear 54 a of the gear mechanism 54, and the idle gear 54 a meshes with the drive gear 55. The motor unit 52 and the idle gear 54a are supported by the slide rail 35 via a bracket (not shown).

The drive gear 55 of the gear mechanism 54 is positioned coaxially with the rotation axis CL of the flapper 21, and as shown in FIGS. 3 and 4, the gear support is formed to project from the inner wall surface in the vehicle width direction of the slide rail 35. The shaft 35j is rotatably supported. That is, a cylindrical gear support shaft 35j is formed on the inner wall surface in the vehicle width direction of the slide rail 35 so as to protrude in the vehicle width direction, and this gear support shaft 35j is formed at the center of the drive gear 55. It fits into the cylindrical recess 55h. As a result, the drive gear 55 is rotatably supported on the inner wall surface of the slide rail 35 in the vehicle width direction.

In the center of the drive gear 55, a prism portion 55k is coaxially formed on the surface opposite to the cylindrical recess 55h, and a cylindrical portion 55e is coaxially formed on the tip side of the prism portion 55k. A disk damper 56 is arranged at the position of the prism portion 55k of the drive gear 55.

[Disk damper]
The disk damper 56 is a rotational force (torque) transmission member that can transmit torque (required torque) input from a rotational drive source to the flapper 21 to rotate the flapper. Further, the disk damper 56 is configured not to transmit a torque exceeding a predetermined holding torque. As shown in FIGS. 4 and 5 and the like, the disk damper 56 includes a disk 562 (input part) and a ring-shaped case 564 (output part), and a part other than the center of the disk 562 is the case 564. It is stored in.

While the torque less than the holding torque is applied between the disk 562 and the case 564, the relative rotation thereof is restricted, and the disk damper 56 can transmit the torque. When a torque exceeding the holding torque is applied between the disk 562 and the case 564, these relative rotations are allowed. Such a transmission operation can be realized by using, for example, the viscous resistance of oil filled between the disk 562 and the case 564.

Here, the holding torque is set to a torque large enough to hold the flapper at an arbitrary position during rotation. Therefore, the holding torque is at least necessary to support the product LW (the weight of the flapper 21 is supported by L) when the distance from the rotation axis CL of the flapper 21 to the center of gravity G of the flapper is L and the weight of the flapper 21 is W. Is set to be slightly larger than

On the other hand, the magnitude of the torque input from the motor to the disk damper in order to rotate the flapper electrically is set appropriately according to the holding torque of the disk damper so as to be reliably transmitted to the flapper. For example, when a flapper is raised, too much torque is input to the disk damper, so that the disk damper cannot transmit torque due to an inertial force that keeps the flapper from stopping at the lying position. . That is, the disk damper 56 is set so as to be able to transmit a torque of a magnitude necessary for rotating the flapper 21 electrically.

In the center of the disk 562 of the disk damper 56, a square hole 562s into which the rectangular column part 55k of the drive gear 55 is fitted is formed. That is, the disk 562 of the disk damper 56 and the drive gear 55 are connected in a state in which relative rotation is impossible. Further, flange portions 564f (see FIG. 4) for bolting the case 564 to a cam plate 582 of a lock mechanism 58 described later are formed on both sides in the radial direction of the ring-shaped case 564 of the disk damper 56. .

[Lock mechanism]
A lock mechanism 58 is provided between the disk damper 56 and the flapper 21 as shown in FIG. The lock mechanism 58 is a mechanism that locks the flapper 21 in the standing position when the flapper 21 is in the standing position as shown in FIG. As shown in FIG. 6 and the like, the lock mechanism 58 includes a lock lever 586 having a lock claw 588, a cam plate 582 for releasing the lock state when the flapper 21 is automatically rotated, and a lock claw 588 of the lock lever 586. Is fitted with a lock plate 584 (see FIG. 7).

As shown in FIG. 2 and the like, the lock lever 586 has a bearing hole 586h formed at the lower end portion of the lock lever 586, and a connecting lateral pin 35p fixed to the slide rail 35 side is inserted into the bearing hole 586h. Yes. Thereby, the lock lever 586 is attached to the slide rail 35 in a state in which the lock lever 586 can rotate counterclockwise or clockwise in FIG. 2 around the connecting lateral pin 35p.

In the vicinity of the bearing hole 586h of the lock lever 586, as shown in FIG. 6 and the like, a substantially rectangular lock claw 588 protruding rearward and downward with respect to the lock lever 586 is provided. Further, the lock claw 588 of the lock lever 586 is configured to be fitted from the front and upper side into a lock groove 584m of the lock plate 584 described later. The lock lever 586 receives an urging force of a lock spring (not shown) in the right rotation direction in FIG. 2, and the lock claw 588 and the lock groove 584m of the lock plate 584 are held in a fitted state by the urging force. (See FIG. 6 etc.). Further, as shown in FIG. 2, a handle 586s for unlocking is provided at the upper end of the lock lever 586. The user can hold the handle 586s and rotate the lock lever 586 in the unlocking direction (left rotation direction) against the urging force of the lock spring.

As shown in FIG. 6, the cam plate 582 is a substantially disk-shaped thick plate having an outer peripheral surface with which the tip of the lock claw 588 of the lock lever 586 abuts. As shown in FIG. 4, the cam plate 582 includes a through hole 582h at the center. The cylindrical portion 55e of the drive gear 55 is passed through the through hole 582h of the cam plate 582 so as to be relatively rotatable. The periphery of the cam plate 582 is bolted to the flange portion 564f of the case 564 of the disk damper 56, as shown in FIGS. As a result, the cam plate 582 is integral with the case 564 of the disk damper 56 and can rotate relative to the disk 562 of the disk damper 56 and the drive gear 55. As shown in FIG. 6 and the like, a part of the outer peripheral surface of the cam plate 582 is configured so that the lock pawl 588 of the lock lever 586 can be moved radially outward by the clockwise rotation of the cam plate 582. A notch-like cam surface 582c is formed.

As shown in FIG. 7, the lock plate 584 is a substantially disc-shaped thick plate having an outer peripheral surface with which the tip of the lock claw 588 of the lock lever 586 abuts. The lock plate 584 is configured to be rotatable integrally with the flapper 21. On the outer peripheral surface of the lock plate 58, a rectangular lock groove 584m into which the lock claw 588 of the lock lever 586 can be fitted is formed at one place in the circumferential direction. The lock groove 584m is positioned at a position where the lock claw 588 of the lock lever 586 can be fitted when the flapper 21 is in the standing position. As shown in FIGS. 4 and 7, a through hole 584h is formed at the center of the lock plate 584, and the cylindrical portion 55e of the drive gear 55 is passed through the through hole 584h in a relatively rotatable state.

As shown in FIG. 7, the lock plate 584 is formed with an arc-shaped long hole 584x on the contact surface with the cam plate. On the other hand, as shown in FIGS. 6 and 7, the cam plate 582 is provided with a protrusion 582 t on the contact surface with the lock plate 584. A cam plate protrusion 582t is inserted into the long hole 584x of the lock plate. The center of the arc of the long hole 584x coincides with the center of rotation of the lock plate 584. Thus, as can be seen from a comparison between FIG. 6 and FIG. 8, the lock plate 584 and the cam plate 582 can be rotated relative to each other by the difference in the circumferential length between the long hole 584x and the protrusion 582t. Yes.

As shown in FIGS. 3 and 4, a flange portion 584f is formed on the opposite side of the contact surface of the lock plate 584 to the cam plate. As shown in FIGS. 6 to 9, the flange portion 584f is connected to a connecting plate portion 21c provided on the rotation shaft portion of the flapper 21, so that the lock plate 584 can rotate integrally with the flapper 21. Yes.

As shown in FIG. 3, the fixing flange 61 of the support portion 60 is connected to the connecting plate portion 21 c (the connecting plate portion 21 c on the right side in the vehicle width direction) of the flapper 21 located on the opposite side to the lock plate 584. . The connecting shaft 63 provided on the fixed flange 61 is supported by a bearing portion 65 of the right slide rail 35 formed coaxially with the gear support shaft 35j of the left slide rail 35.

[Operation of wheelchair lifter and flapper]
Next, operations of the wheelchair lifter 10 and the flapper 21 will be described. In the state where the platform 20 of the wheelchair lifter 10 is stored in the passenger compartment of the one-box vehicle C, the flapper 21 is locked in the standing state by the lock mechanism 58 and held in the standing position as shown in FIG. . At this time, as shown in FIGS. 6 and 7, the lock claw 588 of the lock lever 586 is engaged with the lock groove 584 m of the lock plate 584 that rotates together with the flapper 21 with an urging force.

When the lower switch of the wheelchair lifter 10 is operated in a state where the back door of the one-box vehicle C is opened, the four-bar linkage mechanism 43 of the lifting link mechanism 40 is rotated, and the lifting arm 44 and the platform 20 are moved. Increase by a certain amount. Further, the front / rear slide mechanism 30 (slide mechanism main body 33) provided on the lift arm 44 operates to slide the platform 20 backward (outside the passenger compartment) with respect to the lift arm 44. Next, the four-bar linkage mechanism 43 continues to rotate, so that the lifting arm 44 and the platform 20 are lowered in a substantially horizontal state. When the platform 20 is lowered from the ground to a predetermined height position (substantially the ground position) (see FIG. 1), the lifting link mechanism 40 is stopped.

Thus, when the platform 20 is lowered from the ground to a predetermined height position, energization to the motor 52m of the flapper driving device 50 is started. When the motor 52m of the flapper driving device 50 operates, the output shaft 52j of the speed reducer 52x rotates to the right as shown by the arrow in FIG. 2, and this rotational force is driven through the pinion gear 52p and the idle gear 54a. 55. Then, the clockwise rotational force of the drive gear 55 is transmitted to the disk 562 of the disk damper 56 via the rectangular column part 55k of the drive gear 55 shown in FIGS.

As described above, since the torque input to the disk is appropriately set according to the holding torque of the disk damper 56, the relative rotation of the disk 562 and the case 564 is restricted, and the disk 562 and the case 564 can rotate together. For this reason, the rotational force of the drive gear 55 and the disk 562 of the disk damper 56 is transmitted to the cam plate 582 of the lock mechanism 58 via the case 564 of the disk damper 56.

Then, the cam plate 582 of the lock mechanism 58 rotates clockwise relative to the lock plate 584 from the state of FIG. 6 to the state of FIG. 8 by the length dimension difference between the long hole 584x and the protrusion 582t. As a result, the cam surface 582c of the cam plate 582 presses the lock claw 588 of the lock lever 586 radially outward during relative rotation of the cam plate 582, as shown in FIG. The fitting with the lock groove 584m is released. Thereby, the standing state of the flapper 21 is unlocked.

The cam plate 582 and the lock plate 584 of the lock mechanism 58 are connected in the rotation direction by the long hole 584x and the protrusion 582t, so that the right rotation of the cam plate 582 is transferred to the flapper 21 via the lock plate 584. Be transmitted. That is, the flapper 21 receives the rotational force of the flapper driving device 50 and starts to rotate so as to lie down (to the right). During the rotation of the flapper, the lock claw 588 of the lock lever 586 slides on the outer peripheral surfaces of the cam plate 582 and the lock plate 584 as shown in FIG.

Then, when the flapper 21 is rotated to the lying position shown in FIG. 1, the flapper driving device 50 is stopped. Thereby, the level difference between the rear end of the platform 20 and the ground is eliminated by the slope-shaped flapper 21.

When the flapper 21 and the platform 20 are stored in the vehicle interior, the user operates the lift switch of the wheelchair lifter 10 to operate the flapper drive device 50 and the lift link mechanism 40 in the reverse order to the above order. To do. When the flapper 21 is rotated to the standing position, the lock claw 588 of the lock lever 586 is engaged with the lock groove 584m of the lock plate 584 by the urging force of the lock spring, and the flapper 21 is locked at the standing position.

Further, when the lowering switch of the wheelchair lifter 10 is operated and the platform 20 cannot be lowered from the ground to a predetermined height position, the motor 52m of the flapper driving device 50 is not energized. . In this state, the motor 52m is stopped, and the output shaft 52j of the motor unit 52 (reduction gear 52x) is locked in rotation. Therefore, a drive gear 55 connected to the output shaft 52j of the motor portion 52 via the pinion gear 52p and the idle gear 54a, and a disc 562 of the disc damper 56 fitted to the rectangular column portion 55k of the drive gear 55 are provided. The rotation is locked. However, in this case, the user can manually rotate the flapper 21 to the fall position by the following procedure.

First, the user grasps the handle 586s and rotates the lock lever 586 in the unlocking direction (left rotation direction in FIG. 2) against the urging force to lock the lock claw 588 of the lock lever 586 and the lock plate 584. The fitting with the groove 584m is released.

Next, the flapper 21 is manually rotated in the lying down direction with a rotational force exceeding the holding torque of the disk damper 56. As a result, a torque exceeding the holding torque is applied between the disk 562 and the case 564, and the disk 562 and the case 564 rotate relative to each other. That is, the case 564, the cam plate 582, the lock plate 584, and the flapper 21 of the disk damper 56 are rotated with respect to the drive gear 55 and the disk 562 of the disk damper 56 that are locked in rotation. Thereby, the flapper 21 can be rotated to the lying down position shown in FIG.

In the above procedure, it is possible not only to fold the flapper 21 in the upright position backward but also to lean forward. In this way, by tilting the flapper 21 forward, after the wheelchair K is placed on the platform, the assistant can easily get on the platform.

[Advantages of this embodiment]
In the flapper drive device 50 according to the present embodiment, a disk damper 56 (rotational force transmission member) is provided between the motor 52m as a drive source and the flapper 21. The torque input to the disk damper from the motor 52m (rotation drive source) for rotating the flapper is appropriately set according to the holding torque of the disk damper so as to be reliably transmitted to the flapper. . That is, the disk damper 56 can transmit a torque having a magnitude necessary for electrically rotating the flapper 21. For this reason, when the motor 52m operates and its output shaft (such as the prism portion 55k of the drive gear 55) rotates, the output shaft passes through the disk 562 (input section) and the case 564 (output section) of the disk damper 56. Torque is transmitted to the rotation shaft (cam plate 582, lock plate 584, etc.) of the flapper 21. Thereby, the flapper 21 can be electrically rotated between the standing position and the lying position.

Further, the disk damper 56 is configured so that the disk 562 and the case 564 can be rotated relative to each other when a torque exceeding a predetermined holding torque is applied between the disk 562 and the case 564. For this reason, when the motor 52m is stopped and the rotation of the output shaft is locked, the disk 562 of the disk damper 56 and the case 564 are relatively rotated by applying a rotational force exceeding the holding torque to the flapper 21. It becomes possible. Thereby, the flapper 21 can be manually rotated.

As described above, since the disk damper 56 is used between the motor 52m and the flapper 21, even when the motor 52m is stopped and its output shaft is locked, the flapper 21 is manually rotated. In addition, it is not necessary to manually release the connection between the motor and the flapper 21. For this reason, the manual operation of the flapper 21 is not complicated.

Further, since the output shaft of the motor is locked when the flapper 21 is manually rotated, the rotation of the flapper 21 is transmitted to the speed reducer 52x and the drive gear 55 to generate a rotation sound, a meshing sound, and the like. There is nothing to do. In particular, it is effective to prevent an unpleasant high-frequency sound generated when the gear on the motor 52m side of the reduction gear rotates at a high speed.

In addition, when the flapper is rotated electrically, even if an external force is applied that impedes rotation due to a wheelchair or obstacle coming into contact with or colliding with the flapper, excessive external force is not transmitted to the motor or reducer. These damages are suppressed.

Further, the holding torque of the disk damper 56 is set to a sufficient torque to hold the flapper 21 at an arbitrary position during rotation (between the standing position and the lying position) against its own weight. That is, the holding torque is set based on the product LW (the rotational moment due to the weight of the flapper) of the distance L from the rotation shaft portion CL of the flapper 21 to the gravity center G of the flapper 21 and the weight W of the flapper 21. Therefore, even if the lock of the flapper standing state is released manually or electrically, the flapper does not fall down due to its own weight.

Furthermore, the holding torque of the disk damper 56 is set to be approximately equal to the rotational torque of a magnitude necessary for electrically rotating the flapper. For this reason, when the flapper 21 is electrically rotated, the flapper 21 is rotated with a minimum necessary force. Therefore, when the flapper 21 hits an obstacle during rotation and stops at that position, excessive torque is not transmitted to the flapper 21 even if the driving of the motor unit 52 is continued. For this reason, damage to the flapper can be prevented. Further, when the flapper is manually rotated, the flapper can be rotated with a relatively small force.

[Example of change]
While embodiments of the present invention have been described with reference to the above structure, it will be apparent to those skilled in the art that many substitutions, improvements, and modifications can be made without departing from the scope of the present invention. Accordingly, embodiments of the invention may include all alterations, modifications, and changes that do not depart from the spirit and scope of the appended claims. For example, the embodiment of the present invention is not limited to the specific structure described above, and can be modified as follows.

The rotational force of the output shaft 52j of the motor unit 52 can be transmitted to the disk damper 56 using a chain and a sprocket instead of the gear mechanism 54, and the pinion gear 52p of the output shaft 52j of the motor unit 52 can be transmitted. It is also possible to engage with the drive gear 55 directly.

Further, the transmittable torque of the disk damper 56 is set to be approximately equal to the torque that can hold the flapper 21 in the middle of rotation as in this embodiment, and can be adjusted in several steps. .

Further, the flapper of the present invention can be applied not only to the lifter 10 for wheelchairs as in this embodiment but also to lifters for other uses.

Claims

A flapper drive device that rotates a flapper that is installed on the edge of the platform of the lifter in a state that it can be rotated between a standing position and a lying position,
An input unit configured to be rotatable integrally with an output shaft of the rotation drive source of the flapper; and an output unit configured to be rotatable integrally with the flapper; A torque transmitting member capable of transmitting the torque input to the flapper and rotating the flapper,
The rotational force transmitting member is configured such that the input unit and the output unit can rotate relative to each other when a torque exceeding a predetermined magnitude is applied between the input unit and the output unit. The driving device.
A flapper drive device according to claim 1,
The torque of the predetermined magnitude is set substantially equal to a holding torque capable of holding the flapper at an arbitrary position during rotation.
A flapper drive device according to claim 2,
The holding torque is set based on a product of a distance from a rotation axis of the flapper to a center of gravity of the flapper and a weight of the flapper.