JP4203163B2 - Power transmission device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the power input from the input shaft can be transmitted to the output shaft to perform a desired work, and the output shaft can be freely rotated as necessary, or the output shaft cannot be rotated. The present invention relates to a power transmission device that can be constrained to a state.
[0002]
[Prior art]
As a device for transmitting power, various devices such as a device using a gear train and a device using a belt are used. In a normal mechanical device, when the rotation of a motor is directly input, the rotational speed is large and the torque is small. Therefore, it is common to reduce the rotational speed and increase the torque using a reduction gear.
[0003]
For this reason, when the power is relatively small, an apparatus in which a motor and a speed reducer are integrated is used. In such a device, the shaft of a motor or gear is fixed to a box-shaped frame, the output shaft of the motor is used as the input shaft of the reduction device, and a predetermined number of reduction gears are arranged between the output shaft and the output shaft. It is common.
[0004]
[Problems to be solved by the invention]
The speed reducer as a power transmission device as described above is configured to transmit the input power to the output shaft while decelerating, and cannot freely rotate the output shaft regardless of the rotation of the input shaft. Also, the output shaft cannot be restricted so as not to rotate. For this reason, in order to satisfy the function, it is necessary to provide an electromagnetic clutch in any part.
[0005]
For example, in a roll-up shutter applied to a house or a notebook used in a theater, when the roll-up is completed, the roll-up shaft is constrained to be non-rotatable in order to maintain this roll-up state, or is easily unwound during a power failure. It is necessary to configure to obtain. When such a conventional power transmission device as described above is used as a driving device such as a shutter, it is necessary to provide an electromagnetic clutch or a brake between the output shaft and the winding shaft, and the structure increases in size. There is a problem of complication, and development of a power transmission device that can restrain the output shaft in a non-rotatable state and can make the output shaft free to rotate is underway.
[0006]
An object of the present invention is configured so that power input from an input shaft can be transmitted to an output shaft, and the output shaft can be freely or non-rotatably constrained regardless of whether or not the input shaft rotates. It is to provide a power transmission device.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a power transmission device according to the present invention includes an input shaft for inputting power and an output shaft for outputting power, and the power transmission is connected to the input shaft and the output shaft by a gear train. In the apparatus, a fixed gear disposed in the vicinity of the gear train and configured to be non-rotatable, and a first position disposed at a predetermined portion of the gear train and connecting the gear train to a gear on the output shaft side. A moving gear configured to be movable between a second position meshing with the fixed gear while maintaining meshing, a first position where the moving gear is connected to a gear train, and the moving gear as a fixed gear A second position where the output shaft is made non-rotatable by meshing and a first position where the moving gear is connected to the gear train and a second position where the movable gear meshes with the fixed gear are free to rotate. And a drive member that is selectively moved to the position 3 That.
[0008]
In the power transmission device, since the input shaft and the output shaft are connected by a gear train, the power input from the input shaft can be transmitted to the output shaft via the gear train. Therefore, by making the gear train a reduction gear train having a predetermined number of stages, the gear train can be functioned.
[0009]
In addition, a non-rotatable fixed gear is disposed in the vicinity of the gear train, and the gear train is maintained in mesh with the gear on the output shaft side and is detached from the gear train and fixed from the first position which is the connection position of the gear train. A moving gear that moves to a second position that meshes with the gear is disposed, and the moving gear is moved between the first position, the second position, and the first position and the second position by a driving member. When the movable gear is in the first position, power is transmitted to the output shaft when the movable gear is in the first position by selectively moving to the third position that does not mesh with the other gears or fixed gears that constitute the row. When in the position, the output shaft can be restrained so as not to rotate, and when in the third position, the output shaft can be freely rotated.
[0010]
For this reason, it is possible to set the output shaft in a desired state without providing an electromagnetic clutch or a brake, and when used for the winding drive of a shutter or the like, the structure of the winding mechanism can be simplified and miniaturized. I can do it.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the power transmission device will be described with reference to the drawings. FIG. 1 is a plan view schematically illustrating the configuration of the power transmission device, FIG. 2 is a side view schematically illustrating the configuration of the power transmission device, and FIG. 3 is a movement from the first position to the third position. FIG. 4 is a perspective view for explaining a configuration of a shutter using a power transmission device as a hoisting device.
[0012]
The power transmission device A shown in the figure transmits the rotation of the input shaft 1 to the output shaft 2 and freely rotates the output shaft 2 regardless of whether or not the input shaft 1 rotates, or restricts the output shaft 2 to be unrotatable. Is possible. When this power transmission device A is used as a hoisting device that winds up a shutter or notebook, the stopped state is maintained by restraining the output shaft to be non-rotatable at the hoisting position or in the middle of the hoisting operation. In addition, when it is necessary to manually wind up or down for some reason, it is possible to easily work by setting the output shaft in a freely rotatable state.
[0013]
The power transmission device A has a frame 3, and a motor 4 having a motor shaft serving as the input shaft 1 is attached to the frame 3. The frame 3 is formed as a plate-shaped frame in FIGS. 1 and 2, but is not limited to this shape, and is generally configured in a casing shape.
[0014]
Further, between the input shaft 1 and the output shaft 2, gears 6a to 6d including the moving gear 5 are arranged so as to mesh with each other. The gear 6a is fixed to the input shaft 1, the gear 6d is fixed to the output shaft 2, and the gears 6b and 6c are rotatably attached to the intermediate shafts 7a and 7b.
[0015]
The power transmission device A configured as described above is configured as a four-stage reduction gear by the gears 5, 6a to 6d. However, the power transmission device A according to the present invention is not necessarily limited to the above-described configuration, and may be configured by only the input shaft 1, the output shaft 2, and the moving gear 5.
[0016]
The moving gear 5 is arranged so that the large gear 5a meshes with the gear 6a fixed to the output shaft 1, and the small gear 5b can mesh with the intermediate gear 6b, and is driven by the driving member 8 to move to a predetermined position. It is rotatably attached to a movable shaft 9 configured as described above.
[0017]
The drive member 8 has a function of moving and holding the movable shaft 9 at three different positions. There are a solenoid, a cylinder, a wire, and a rope as the drive source 8a capable of exhibiting such a function. In this embodiment, a three-position solenoid is used as the drive member 8. The drive member 8 includes a drive source 8a and a lever 8b driven by the drive source 8a.
[0018]
The drive member 8 is configured by attaching a lever 8b to a drive source 8a, and a movable shaft 9 is fixed to the tip of the lever 8b. The lever 8b is configured to be rotatable about a shaft 8c provided at the rotation center of the intermediate gear 6b with which the small gear 5b of the moving gear 5 is engaged, and the distance from the rotation center to the movable shaft 9 is small. It is set to a value obtained by adding the radius of the pitch circle of the gear 5b and the radius of the pitch circle of the intermediate gear 6b. Therefore, when the lever 8b is driven by the drive source 8a, the moving gear 5 moves along the pitch circle diameter of the intermediate gear 6b while maintaining the state where the small gear 5b is engaged with the intermediate gear 6b.
[0019]
When the moving gear 5 is engaged with the gears 6a and 6b (in the state of the solid line in FIG. 1), the stroke range of the driving source 8a constituting the driving member 8 is a position where the moving gear 5 is not engaged with the moving gear 5. The fixed gear 10 is provided at a position that does not exceed. The fixed gear 10 has a function of meshing with the large gear 5a of the moving gear 5 to restrain the moving gear 5 so as not to rotate, and thereby restrain the output shaft 2 so as not to rotate. For this reason, the fixed gear 10 is provided in a state of being substantially fixed to the frame 3.
[0020]
In the power transmission device A configured as described above, the gear which fixes the large gear 5a of the moving gear 5 to the input shaft 1 by operating the drive member 8 as shown in FIG. 3A (see the solid line in FIG. 1). When the gear 6a and the intermediate gear 6b are moved to the first position, the moving gear 5 and the gears 6a to 6d constituting the gear train mesh with each other, and the rotation of the input shaft 1 is transmitted to the output shaft 2. Therefore, it is possible to rotate the output shaft 2 in a state where the rotation of the motor 4 is decelerated according to the gear ratio of the gear train.
[0021]
Next, by operating the drive member 8 to rotate the moving gear 5 along the pitch circle of the intermediate gear 6b, as shown in FIG. 1B (see the two-dot chain line in FIG. 1), the large gear When the 5a is moved to the second position where it engages with the fixed gear 10, the movable gear 5 is restrained by the fixed gear 10 so as not to rotate. For this reason, the gears 6b to 6d meshed with the moving gear 5 are all restricted so as not to rotate, and the output shaft 2 is also restricted so as not to rotate. That is, the output shaft 2 is in the same state as when the brake is applied, and the output shaft 2 is restrained so as not to rotate. For this reason, when a torque acts on the output shaft 2 from the outside, the output shaft 2 does not rotate regardless of the action of the torque.
[0022]
Next, by operating the drive member 8 and rotating the moving gear 5 along the pitch circle of the intermediate gear 6b, the gear 6a is fixed as shown in FIG. 1C (see the dotted line in FIG. 1). When the large gear 5a of the moving gear 5 which is an intermediate position with the gear 10 is moved to the third position where it does not mesh with any gear, the moving gear 5 is not restrained by either the gear 6a or the fixed gear 10. Therefore, the rotation of the input shaft 1 is not transmitted and is not restrained by the fixed gear 10. Accordingly, the gear train of the moving gear 5 and the gears 6b to 6d is in a freely rotatable state, and the output shaft 2 is also set in a freely rotatable state. For this reason, when a torque acts on the output shaft 2 from the outside, the output shaft 2 rotates freely according to this torque.
[0023]
As described above, the power transmission device A according to the present embodiment operates the drive member 8 to selectively move the moving gear 5 between the first position and the third position, so that the input shaft 1 Can be transmitted to the output shaft 2, or the output shaft 2 can be restrained to be non-rotatable or freely rotated regardless of the rotation of the input shaft 1. Such a power transmission device A can control the rotation of the output shaft 2 without requiring a special electromagnetic clutch or electromagnetic brake.
[0024]
The power transmission device A configured as described above can be applied to various devices. Here, as an example of application, the configuration of the shutter B using the power transmission device A as a hoisting device will be described with reference to FIG.
[0025]
In the figure, the shutter B has a winding shaft 12 around which a slat 11 is wound. As the winding shaft 12 rotates, the slat 11 is guided along a guide 13 and lifts up and down. The unit 14 is configured to be able to open and close. The output shaft 2 of the power transmission device A is directly connected to the winding shaft 12, and the slat 11 is moved up and down by operating the power transmission device A.
[0026]
That is, when the slat 11 is moved up and down to open and close the opening 14, the moving gear 5 of the power transmission device A moves to the first position (see FIG. 3A) and meshes with the gears 6a and 6b. When the motor 4 is rotated, this rotation is transmitted to the output shaft 2 through the gear train. For this reason, the winding shaft 12 rotates in a predetermined direction, and the slat 11 moves up and down in accordance with this rotation.
[0027]
When the winding of the slat 11 is completed and the shutter B is opened, or when the rewinding is completed and the shutter B is closed, the moving gear 5 is moved to the second position (see FIG. 3B). By moving it, the output shaft 2 is restrained in a non-rotatable state. For this reason, it is impossible to lower the slat 11 from the outside. Similarly, it is impossible to raise the slat 11 from the outside.
[0028]
Further, when the moving gear 5 is moved to the third position (see FIG. 3C) after the slat 11 has been wound or unwound, the slat 11 is lowered or raised from the outside. It can be easily lowered or raised.
[0029]
【The invention's effect】
As described above in detail, in the power transmission device according to the present invention, the gear train is connected to the gear train formed between the input shaft and the output shaft, or moved so as to release the connection of the gear train. When the moving gear is moved to the first position and the gear train is connected, the rotation of the input shaft can be transmitted to the output shaft to transmit the power. When the moving gear is moved to the second position to release the connection of the gear train and meshed with the fixed gear, the output shaft can be restrained so as not to rotate, and the moving gear is moved to the third position. When the input shaft and the fixed gear are not engaged with each other, the output shaft can be held in a freely rotatable state. For this reason, an electromagnetic clutch or an electromagnetic brake disposed between the output shaft and the target operating unit is not necessary, and an extremely miniaturized power transmission device can be obtained.
[0030]
Therefore, for example, it is advantageous when used as a shutter hoisting device, particularly as a shutter hoisting device provided in a very small space such as a house.
[Brief description of the drawings]
FIG. 1 is a plan view schematically illustrating a configuration of a power transmission device.
FIG. 2 is a side view schematically illustrating the configuration of a power transmission device.
FIG. 3 is a diagram for explaining a meshing state of a moving gear in a first position to a third position.
FIG. 4 is a perspective view illustrating a configuration of a shutter using a power transmission device as a hoisting device.
[Explanation of symbols]
A power transmission device B shutter 1 input shaft 2 output shaft 3 frame 4 motor 5 moving gear 5a large gear 5b small gears 6a to 6d gears 7a and 7b intermediate shaft 8 driving member 8a driving source 8b lever 8c shaft 9 movable shaft
10 Fixed gear
11 Slats
12 Winding shaft
13 Guide
14 opening

Claims (1)

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 by a gear train, and is disposed in the vicinity of the gear train so as not to rotate. A fixed gear that is configured, a first position that is disposed at a predetermined portion of the gear train, and a second position that meshes with the fixed gear while maintaining meshing with the gear on the output shaft side. A movable gear configured to be movable between the first gear, a first position where the movable gear is connected to a gear train, a second position where the movable gear is meshed with a fixed gear and the output shaft is non-rotatably restrained, and A drive member that selectively moves the moving gear between a first position connecting the gear train and a second position engaging the fixed gear to a third position where the output shaft is free to rotate; A power transmission device characterized by.

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