WO2001023774A1

WO2001023774A1 - Power transmission device

Info

Publication number: WO2001023774A1
Application number: PCT/JP2000/006647
Authority: WO
Inventors: Kenji Hosoyama; Toru Matsuda
Original assignee: Sanwa Shutter Corporation; Yamato Tape Co., Ltd.
Priority date: 1999-09-30
Filing date: 2000-09-27
Publication date: 2001-04-05
Also published as: JP2001099239A

Abstract

A power transmission device (A) having an input shaft (1) for receiving a power and an output shaft (2) for outputting a power connected to each other through gears (6a) to (6), characterized by comprising a worm (5a) connected to the input shaft (1), a worm wheel (5b) formed so as to be engageable with or disengageable from the worm (5a) and connected to the output shaft (2) through a counter gear (6b), and a drive member (9) moving the worm wheel (5b) so as to be engageable with or disengageable from the worm (5a).

Description

Specification

Power transmission technology

The present invention relates to a power transmission device for transmitting power input from an input shaft to an output shaft, and particularly to a power transmission device that selects an output shaft in a freely rotatable state, a state in which power can be transmitted, and a state in which the output shaft is restrained from rotating. It relates to a power transmission device that can perform the power transmission. Technology background

Various devices have been provided for transmitting input power to the output shaft. Among them, a method in which a gear train is interposed between an input shaft and an output shaft and power is transmitted while decelerating by the gear train is often used. For example, when the power to be transmitted is relatively small, a device that integrates a motor and a reduction gear is used. In such a device, the shaft of a motor or a gear is fixed to a box-shaped frame, the output shaft of the motor is used as an input shaft, and a predetermined number of reduction gears are provided between the output shaft and the motor. Generally, they are arranged and configured.

The speed reducer as a power transmission device as described above transmits the power that has been manually input to the output shaft while reducing the rotation speed, and separates the output shaft from the rotation of the human input shaft to freely rotate the output shaft. It does not have the function of rotating the output shaft or restricting the output shaft so that it cannot rotate. If the rotation of the input shaft and the rotation of the output shaft are separated and rotated or restrained, it is necessary to provide an electromagnetic clutch or brake.

For example, roll-up shutters used in houses and curtains used in theaters In books and the like, it is necessary that the hoisting shaft be constrained to be unrotatable in order to maintain this hoisted state when the hoisting is completed, or that the hoisting shaft can be easily rolled down during a power failure. is there. If such a conventional power transmission device as described above is used as a drive device for such a shutter or the like, there is a space for providing an electromagnetic clutch or an electromagnetic brake between the output shaft and the hoisting shaft. There is a problem that the structure becomes larger and more complicated as necessary.

An object of the present invention is to make the output shaft freely rotatable regardless of the rotation of the input shaft or to restrain the output shaft in a non-rotatable state with a simple structure, and to reduce the size. The purpose of the present invention is to provide an improved power transmission device. Disclosure of the invention

In order to solve the above problems, a power transmission device according to the present invention includes: an input shaft for inputting power; and an output shaft for outputting power, wherein the input shaft and the output shaft are connected via a gear. In the transmission device, a worm connected to the input shaft, a worm wheel configured to be able to engage or disengage with the worm, and connected to the output shaft via an intermediate gear; And a driving member for moving the ohmic wheel to inject or release the worm from the worm.

In the power transmission device, the worm wheel can be connected to the worm connected to the input shaft by driving the driving member, or the connection can be released. Therefore, when the worm wheel is connected to the worm and the human power shaft is rotated, power can be transmitted to the output shaft.In addition, the input shaft is connected with the worm wheel and the worm wheel combined. If the motor is not rotated, the output shaft will not rotate | π | due to the combination of the worm and the worm wheel even when a force acts on the output shaft. Can be done. Further, when the connection between the worm and the worm wheel is released, the output shaft can be freely rotated according to the external force acting without being restrained at all. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic diagram illustrating a configuration of a power transmission device. FIG. 2 is a diagram for explaining the configuration of the power transmission device, and is a rear view of FIG. 1 (a). FIG. 3 is a diagram illustrating a configuration of a shutter using the power transmission device according to the present embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the power transmission device will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating the configuration of the power transmission device. FIG. 2 is a diagram for explaining the configuration of the power transmission device, and is a rear view of FIG. 1 (a). FIG. 3 is a diagram illustrating a configuration of a shutter using the power transmission device according to the present embodiment.

The power transmission device A according to the present embodiment can transmit the rotation of the input shaft 1 to the output shaft 2 and freely rotate the output shaft 2 regardless of the rotation of the input shaft 1. By stopping the rotation of shaft 1, output shaft 2 can be restrained from rotating. In particular, when this power transmission device A is used as a winding device for winding up a shutter or a curtain, the output shaft 2 is restrained from rotating at a winding position or at a position during winding. However, it is possible to hold the stopped state, and if for some reason it is necessary to manually wind up or down, the output shaft 2 must be turned off. Each of the above operations can be easily performed by making the robot turn freely. Is possible.

The power transmission device A has a frame 3, and a motor 4 having one motor shaft serving as an input shaft 1 is attached to the frame 3. The frame 3 may be formed in a plate shape, but is generally formed in a casing shape as shown in the figure.

A pair of worms 5a, worm wheels 5b, and spur gears 6a to 6c are arranged between the input shaft 1 and the output shaft 2 to form a gear train. Thus, the power input to the input shaft 1 is transmitted to the output shaft 4 while reducing the rotation speed. Then, the rotation and power of the input shaft 1 are transmitted to the output shaft 2 by bringing the worm wheel 5b close to or away from the worm 5a to release the connection. It is possible to freely rotate output shaft 2 regardless of the rotation of 1.

That is, the worm 5a is fixed to the output shaft 1, and the power is transmitted to the output shaft 2 in accordance with the worm 5a, or the rotation of the output shaft 2 is released by canceling the connection with the worm 5a. Free worm wheel 5b is arranged. The worm wheel 5b is provided with a spur gear 6a in a body form, and the worm wheel 5b and the spur gear 6a are rotatably mounted on the moving shaft 7. . The spur gear 6a is coupled to a spur gear 6b rotatably mounted on the fixed shaft 8, and further coupled to the spur gear 6b is a spur gear 6c fixed to the output shaft 2. I have.

In the present embodiment, the spur gear 6b has a function as an intermediate gear. However, the spur gear 6 a is not necessarily required as the intermediate gear, and the spur gear 6 a provided integrally with the worm wheel 5 b is fixed to the output shaft 2. In this case, the spur gear 6a functions as a middle tooth. The moving shaft 7 rotatably supports the worm wheel 5b and the spur gear 6a integrated with the worm wheel 5b, and is driven around a pin 10 by a solenoid 9 constituting a driving member. As a result, the worm wheel 5b moves in the direction of arrow b and in the direction of arrow A by being urged by the spring 12 and maintains the combined state of the spur gear 6a with the spur gear 6b with this movement. Is to be combined with the room 5a, or the combination is canceled.

For this reason, the moving shaft 7 is disposed so as to penetrate the arc-shaped long hole 3 a formed in the frame 3, and is configured to be rotatable around the pin 10. It is attached to one end side of the. An actuator 9 a of a solenoid 9 for driving the lever 11 in the direction of arrow b is connected to the other end of the lever 11, and an actuator 9 a is provided near the moving shaft 7. A panel 12 for urging the lever 11 so as to move the lever 11 in the direction of the arrow a is provided, and one end thereof is connected to a locking piece 13 provided at a predetermined position of the frame 3.

Therefore, the lever 11 is always urged by the panel 12 about the pin 10 in the direction of arrow a, and can be rotated in the direction of arrow b by driving the solenoid 9. It is configured as follows. Then, with the rotation of the lever 11, the connection of the worm wheel 5 b to the worm 5 a and the release of the connection can be performed.

The position of the pin 10 which is the center of rotation of the lever 11 is not particularly limited. That is, when the worm wheel 5b is combined with the worm 5a, it is necessary that the spur gear 6a is combined with the spur tooth group 6b, but when the worm wheel 5b is combined with the worm 5a. When the condition is canceled, the spur gear 6a does not necessarily have to be combined with the spur gear 6b. However, in order for the worm wheel 5b to smoothly mesh with the worm 5a, it is preferable that the pin 10 is located at the same axial center as the fixed shaft 8 of the spur tooth Φ6b. Next, transmission of power by the power transmission device A configured as described above, restraint of the output shaft 2 and a state of free rotation will be described.

In the power transmission device A, when the solenoid 9- is not driven, the lever 11 is always urged in the direction of the arrow a by the spring 12; Is similarly urged in the direction of arrow a, and the worm wheel 5b is always engaged with the worm 5a. Therefore, by driving the motor 4, the input shaft 1 is rotated, and this rotation is reduced according to the gear ratio of the worm 5 a and the worm wheel 5 b, and the rotation is performed via the spur gears 6 a to 6 c. It is possible to transmit power by rotating the output shaft 2 with the power.

When the motor 14 is stopped by combining the worm 5a and the worm wheel 5b, the combined state of the worm 5a, the worm wheel 5b, and the spur gears 6a to 6c is maintained, and the output shaft 2 Even when some rotational force is applied, the combination of the worm wheel 5b and the worm 5a prevents the output shaft from rotating by exerting a function as a brake. Therefore, the rotation of the output shaft 2 can be restricted.

When the solenoid 9 is driven to suck the actuator 9a, the lever 11 (moving shaft 7) rotates in the direction of the arrow b with the suction, and the worm wheel 5b rotates the worm 5a. And the combination of both is released. Therefore, the input shaft 1 and the output shaft 2 are in a free state without restraining each other, and the output shaft 2 is easily rotated by applying some rotational force to the output shaft 2. It is possible.

In this embodiment, the gear train formed by the spur gears 6a to 6c disposed between the worm wheel 5b and the output shaft 2 is not limited to the above-described configuration, and is not limited to power transmission. It should be set according to the reduction ratio required for device A and other conditions. Further, in the present embodiment, the driving member for moving the worm wheel 5b (moving shaft 7) is constituted by the solenoid 9 and the panel 12; however, the present invention is not limited to this structure. For example, it is possible to selectively use a 2-position solenoid, a small-sized cylinder, or a manually operated wire.

The power transmission device A configured as described above can be employed as a drive source of various devices, particularly, a hoisting device. Here, as an application example, a configuration of a shutter B in which the power transmission device A is used as a hoisting device will be briefly described with reference to FIG.

In the figure, the shutter B has a winding shaft 22 around which a slit 21 is wound. With the rotation of the winding shaft 22, the slit 21 is guided by a guide 23 and moves up and down. Thus, the opening 24 can be opened or closed. The output shaft 2 of the power transmission device A is directly connected to the winding shaft 22, and by operating the power transmission device A, the slit 21 is moved up and down.

That is, when opening and closing the opening 24 by raising and lowering the slit 21, the lever 11 is moved by the panel 12 in the direction of arrow a without operating the solenoid 9 of the power transmission device A. Energize to couple worm wheel 5b with worm 5a. When the motor 4 is driven in this state, the input shaft 1 rotates, and the rotation is transmitted to the output shaft 2 via the gear trains 5 a, 5 b, 6 a to 6 c. The take-up shaft 22 rotates in a predetermined direction to take up or rewind the slit 21 to open and close the opening 24.

When the winding of the slit 21 is completed and the shutter B is opened, or when the rewinding is completed and the shutter B is closed, the motor 14 is turned off. When Ik is stopped;: keeps the combined state of the tooth rows 5a, 5b, 6a-6c Thus, the output shaft 2 is restrained from rotating. Therefore, it is impossible to lower or raise the slit 21 from outside. Also, when the winding and rewinding of the slit 21 is completed or during the course, the solenoid 9 is driven to rotate the lever 11 in the direction of the arrow b. When the moving shaft 7 is separated from the worm 5a by moving the worm wheel 5b and the worm wheel 5b is released from the worm 5a, the output shaft 2 is not restrained at all, and the Free rotation is possible. Therefore, it is possible to easily raise or lower the slurry 21 by applying a force to the slurry 21 from the outside. Industrial applicability

As described in detail above, in the power transmission device according to the present invention, the worm is connected to the input shaft, and the worm wheel connected to the output shaft via the intermediate gear is connected to or connected to the worm by the driving member. Since the configuration is such that the coupling can be released, when the worm wheel is coupled to the worm and the input shaft is rotated, the power can be transmitted to the output shaft. If the input shaft is not rotated while the ohm and worm wheel are combined, the output shaft may rotate due to the combination of the worm and worm wheel even if force is applied to the output shaft. Absent. Therefore, the output shaft can be restrained. Furthermore, when the connection between the worm and the worm wheel is released, the output shaft can be freely rotated by | π | according to the applied external force without any restriction.

As described above, it is possible to achieve the same function as when these are employed without using an electromagnetic clutch or an electromagnetic brake. Therefore, a power transmission device having many functions. The structure is extremely simple and the FI size can be reduced. Can be. Therefore, it is particularly advantageous when used in a hoisting device for a housing shutter with a small space.

Claims

The scope of the claims

A power transmission device having an input shaft for inputting power and an output shaft for outputting power, wherein the input shaft and the output shaft are connected via a gear, and a worm connected to the input shaft; A worm wheel configured to engage or disengage with the worm and connected to the output shaft via an intermediate gear; and moving the worm wheel to engage or disengage the worm. A power transmission device, comprising: