JP2007177405A - Drive unit of shutter curtain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive unit of a shutter curtain, which can reduce the number of components, and which can maintain a stopped state of the shutter curtain when the drive motor is stopped. <P>SOLUTION: A speed reducing mechanism 12, which transmits a rotational drive force of a drive motor 11 to a winding drum 6 by reducing a speed, comprises: an external sun gear 14b which is fixed to a drive shaft 11a of the drive motor 11; a planetary gear 15 which rotates while revolving around the sun gear 14b by engaging with it; a fixed internal gear 20 which is irrotatably and fixedly arranged around the planet gear 15 so as to engage with the planet gear 15; a rotatable and movable internal gear 21 which is juxtaposed with the internal gear 20 and engaged with the planet gear 15; and an output shaft 26 which is fixed to the internal gear 21 so as to rotate the winding drum 6. Thus, a speed reduction ratio of the speed reduction mechanism 12 is set at a moderate value, so that a self-lock function can be carried out for the maintenance of the stopped state of the shutter curtain. Additionally, the number of the components can also be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shutter curtain driving device that opens and closes an opening of a building such as a house.

As a shutter device provided in an opening of a building such as a house, a rotational force is transmitted from a shutter curtain that moves up and down along a pair of guide rails that are erected on the left and right sides of the opening, and a drive motor. Thus, there is known an automatic opening / closing type shutter device including a winding drum that winds up and rewinds the shutter curtain.
As an example of a shutter curtain driving device that rotates a winding drum that winds and rewinds the shutter curtain of such an automatic opening / closing shutter device around an axis, a device disclosed in Patent Document 1 is known.

In the shutter curtain drive device described in Patent Document 1, during operation, the electric motor (drive motor) outputs a rotational torque, and the output of the electric motor is a rotational torque that is decelerated (boosted) by the speed reducer. The output unit is transmitted to the output unit, and the output unit engages with the take-up drum to rotate it. The speed reducer boosts the rotational torque of the electric motor and transmits it to the output unit, and is composed of a planetary gear including three stages of resin gears.
JP 2002-266572 A

As described above, in the shutter curtain driving device described in Patent Document 1, a plurality of planetary gear mechanisms (for example, planetary planetary gear mechanisms) are used as the torque necessary for driving the shutter curtain with an electric motor (drive motor). Since it is obtained by using a stage (for example, three stages) and decelerating, the number of parts has increased.
In addition, when the drive motor is stopped, the shutter curtain stop state cannot be maintained, so a separate electromagnetic brake, a part that controls this, or a mechanism to replace it is necessary, and the number of parts increases, resulting in high costs. It was.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shutter curtain driving device capable of reducing the number of parts and maintaining the shutter curtain stopped state when the drive motor is stopped. .

In order to achieve the above object, a shutter curtain driving device according to claim 1 of the present invention is a shutter curtain driving device for rotating a winding drum for winding and unwinding the shutter curtain around an axis. And
A drive motor, and a reduction mechanism that transmits the rotational driving force of the drive motor to the winding drum at a reduced speed,
The reduction mechanism includes a sun outer gear fixed to the drive shaft of the drive motor, a planetary gear that meshes with the sun outer gear and revolves around the sun outer gear, and rotates around the planetary gear. A fixed internal gear in which the planetary gear meshes with the fixed internal gear, and a movable internal gear that is coaxially arranged in the fixed internal gear and rotatable about the axis, and meshes with the planetary gear, and the movable internal gear A wonder planetary gear mechanism having an output shaft that is fixed to the rotation center and rotates the winding drum.

  The shutter curtain drive device according to claim 2 is the shutter curtain drive device according to claim 2, wherein a cylindrical case is inserted into the winding drum. The drive motor and the speed reduction mechanism are provided.

According to the shutter curtain drive device of claim 1, the speed reduction mechanism for decelerating and transmitting the rotational drive force of the drive motor to the take-up drum includes the sun outer gear fixed to the drive shaft of the drive motor, and the planetary gear. Since the planetary gear mechanism is provided with a gear, a fixed internal gear, a movable internal gear, and an output shaft that is fixed to the movable internal gear and rotates the take-up drum, the conventional planetary gear mechanism has a plurality of stages. The number of parts can be reduced compared to the speed reduction mechanism used.
In addition, since it has a self-locking function by setting the speed reduction ratio of the speed reduction mechanism to an appropriate speed reduction ratio, the stop state of the shutter curtain is maintained when the drive motor is stopped without using an electromagnetic brake or the like. it can.

  According to the shutter curtain drive device of the second aspect, the cylindrical case is inserted in the winding drum, and the drive motor and the speed reduction mechanism are provided in the case. Easy installation in a relatively small space in the take-up drum by preloading a drive motor and a reduction mechanism consisting of a sun outer gear, planetary gear, fixed internal gear, movable internal gear, output shaft, etc. A drive motor and a speed reduction mechanism can be incorporated into the motor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, before describing the shutter curtain driving device according to the present invention, an outline of a shutter device equipped with the shutter curtain driving device will be briefly described. FIG. 1 is a front view of the shutter device 1, and FIG. 2 is a front view of the shutter device with the case removed.
As shown in FIGS. 1 and 2, the shutter device 1 is provided with a shutter curtain 2 that opens and closes an opening of a building, and is erected on the left and right of the shutter curtain 2, and guides the up-and-down movement of the shutter curtain 2. A pair of guide rails 4 and 4, a winding drum 6 which is provided in a case 5 disposed above the pair of guide rails 4 and 4 and winds and unwinds the shutter curtain 2, and the winding drum 6 And a drive device for rotationally driving the motor. This drive device is loaded in a case 8 shown in FIG.

The shutter curtain 2 is configured by connecting a plurality of elongated slats 7 vertically. An upper end portion of the shutter curtain 2 is fixed to a winding drum 6 in the case 5. In FIG. 2, the shutter curtain 2 is removed from the winding drum 6.
Each of the pair of guide rails 4 and 4 has a substantially U-shaped cross section, and the openings of the guide rails 4 and 4 are arranged to face each other. Both end portions of the shutter curtain 2 are inserted into the guide grooves formed by the internal spaces of the guide rails 4 and 4, and both end portions of the shutter curtain 2 are guided into the guide grooves so as to move up and down. Yes.
Both ends of the winding drum 6 in the case 5 are supported by bearing brackets (not shown) so as to be freely rotatable in the forward and reverse directions.

The winding drum 6 is formed in a cylindrical shape, and a cylindrical case 8 is inserted therein, and the drive device is loaded in the case 8.
Hereinafter, the driving apparatus will be described with reference to FIG.
First, the drive device 10 includes a drive motor 11 and a speed reduction mechanism (wonder planetary gear mechanism) 12 that transmits the rotational driving force of the drive motor 11 to the winding drum 6 at a reduced speed.
The drive motor 11 is an electric motor, and is fixed to a motor bracket 13 fixed to the inner peripheral surface of the case 8. The drive shaft 11a of the drive motor 11 is inserted into a hole (through hole) formed in the central portion of the motor bracket 13, and a motor pinion 14 is coaxially fixed to the drive shaft 11a. The motor pinion 14 includes a connecting portion 14a and a pinion gear 14b formed on the front end surface of the connecting portion 14a, and the drive shaft 11a is inserted and fixed in a hole formed in the connecting portion 14a. Thus, the drive shaft 11 a is coupled to the motor pinion 14. The pinion gear 14 b constitutes the sun outer gear 14 b of the mysterious planetary gear mechanism 12.

Three planetary gears 15 mesh with the sun outer gear 14b. Each planetary gear 15 is constituted by a first planetary gear 16 and a second planetary gear 17, and the first planetary gear 16 and the second planetary gear 17 have the same number of teeth and the same outer diameter. Of course, the first planetary gear 16 and the second planetary gear 17 may have different numbers of teeth and different outer diameters.
An involute serration shaft 16 a is formed coaxially with the first planetary gear 16 on the right end surface of the first planetary gear 16. An involute serration hole 17a is formed on the left end surface of the second planetary gear 17 coaxially with the second planetary gear 17 and the involute serration shaft 16a. An involute serration shaft 16a is fitted into the involute serration hole 17a, whereby the first planetary gear 16 and the second planetary gear 17 are connected to rotate in the same direction in synchronization. In addition, the first planetary gear 16 and the second planetary gear 17 are connected in a state where the opposed end surfaces are in contact with each other.

The first planetary gear 16 and the second planetary gear 17 are held by a planetary gear holder 18. The planetary gear holder 18 is composed of opposing disk-shaped plates 18a, 18a and a plurality of (three in this example) connecting members that connect these plates, and these connecting members are adjacent in the circumferential direction. It passes between the matching planetary gears 15 and 15. A plurality of (three in this example) shafts 19 are arranged between the plates 18a and 18a at equal intervals in the circumferential direction, and both ends of these shafts 19 are formed on the plates 18a and 18a, respectively. It is inserted into the hole. These shafts 19 are arranged between connecting members adjacent to each other in the circumferential direction. Each shaft 19 has a hole formed in the center of the planetary gear 15, a hole formed in the involute serration shaft 16a, and an involute serration. It is inserted through the hole 17a.
Thus, the three planetary gears 15 constituted by the first planetary gear 16 and the second planetary gear 17 are held at predetermined intervals in the circumferential direction by the planetary gear holder 18 and are restricted from moving in the axial direction. Yes. Each planetary gear 15 is supported by a shaft 19 so as to be rotatable in forward and reverse directions.

Outside the planetary gear holder 18, a fixed internal gear 20 that meshes with the first planetary gear 16 of the planetary gear 15, and the fixed internal gear 20 are arranged in parallel so as to be coaxial and rotatable about the axis. A movable internal gear 21 that meshes with the second planetary gear 17 is provided.
The fixed internal gear 20 and the movable internal gear 21 are loaded in the housing 22. The housing 22 is formed in a cylindrical shape whose right end opening is closed by a plate 22a, and a cylindrical portion 22b is formed at the center of the plate 22a. The fixed internal gear 20 loaded in the housing 22 is fixed to the housing 22 by a screw 23 so as not to rotate. A plurality of screws 23 are provided at predetermined intervals in the circumferential direction of the housing 22.
A plate 20a is provided at the left end portion of the fixed internal gear 20, and a cylindrical portion 20b is formed at the center of the plate 20a. The connecting portion 14a of the motor pinion 14 is inserted into the cylindrical portion 20b. A bearing 24 is provided between the inner peripheral surface of the fixed internal gear 20 and the shaft provided at the left end of the planetary gear holder 18. On the other hand, a bearing 25 is provided between the inner peripheral surface of the movable internal gear 21 and the shaft provided at the right end of the planetary gear holder 18. Therefore, the planetary gear holder 18 can rotate around the axis in the fixed internal gear 20 and the movable internal gear 21.

  The movable internal gear 21 loaded in the housing 22 is provided in the housing 22 so as to be rotatable about its axis, and a hole 21a is formed on the right end surface thereof. The hole 21a is a triangular hole whose apex is formed in an arc shape. Of course, the hole 21a may have other shapes. An output shaft 26 for rotating the winding drum 6 is inserted and fixed in the hole 21a. The output shaft 26 protrudes from the housing 22 through a cylindrical portion 22 b formed at the center of the plate 22 a of the housing 22. Further, the output shaft 26 protrudes outward from the right end portion of the case 8. As shown in FIG. 2, a disk 26 a is fixed to the output shaft 26, and the disk 26 a is fixed to the inner surface of the winding drum 6. Therefore, when the output shaft 26 rotates about the axis, the disk 26a also rotates, and thereby the winding drum 6 rotates.

  In the drive device 10 including the speed reduction mechanism (wonder planetary gear mechanism) 12 having the above-described configuration, the pinion gear (sun outer gear) 14b rotates as the drive shaft 11a of the drive motor 11 rotates. As the sun outer gear 14b rotates, the first planetary gears 16 of the three planetary gears 15 meshing with the sun outer gear 14b and the fixed inner gear 20 rotate (revolve) while revolving. Since the first planetary gear 16 is connected to the second planetary gear 17, the second planetary gear 17 rotates while revolving together with the first planetary gear 16. Since the second planetary gear 17 meshes with the movable internal gear 21, the movable internal gear 21 rotates around the axis. Since the output shaft 26 is fixed to the movable internal gear 21, the output shaft 26 rotates around the axis together with the movable internal gear 21. In this way, the rotational driving force of the drive shaft 11 a of the drive motor 11 is decelerated and transmitted to the output shaft 26. That is, the rotational driving force of the drive shaft 11 a is decelerated by the reduction mechanism (wonder planetary gear mechanism) 12 and transmitted to the output shaft 26. Then, the winding drum 6 is rotated by the output shaft 26 via the disk 26a.

  Table 1 summarizes examples of the specifications of the sun outer gear 14b, the planetary gear 15 (first planetary gear 16 + second planetary gear 17), the fixed internal gear 20, and the movable internal gear 21 that constitute the speed reduction mechanism 12. To do.

Therefore, the reduction ratio of the speed reduction mechanism 12 in this case is as follows.
Reduction ratio = (10 / (10 + 62)) × (1− (62/26) × (26/59)) = − 1 / 141.6
It becomes.

Thus, in this example, the reduction mechanism 12 has a reduction ratio of −1 / 141.6 and has a self-locking function. That is, for example, assuming that the efficiency between adjacent spur gears is 95%, if the reduction ratio is 1/20 or less, the efficiency when rotating from the output side (movable internal gear) is 0% or less. Self-lock function works. Therefore, by setting the speed reduction ratio of the speed reduction mechanism 12 to an appropriate speed reduction ratio, the stop state of the shutter curtain 2 can be maintained when the drive motor 11 is stopped without using an electromagnetic brake or the like.
In addition, the speed reduction mechanism 12 is fixed to the sun outer gear 14 b fixed to the drive shaft 11 a of the drive motor 11, the planetary gear 15, the fixed internal gear 20, the movable internal gear 21, and the movable internal gear 21. Since the mysterious planetary gear mechanism is provided with the output shaft 26 for rotating the winding drum 6, the number of parts can be reduced as compared with a speed reduction mechanism using a plurality of stages of conventional planetary gear mechanisms.
Furthermore, by setting an appropriate reduction ratio as described above, the self-locking function is activated by the speed reduction mechanism 12. Therefore, a conventional electromagnetic brake and parts for controlling the same are required, and the number of parts can be further reduced and the cost can be reduced. Can be suppressed.
In addition, a cylindrical case 8 is inserted into the take-up drum 6, and a drive motor 11 and a speed reduction mechanism 12 are provided in the case 8. By loading the speed reduction mechanism 12 composed of the sun outer gear 14b, the planetary gear 15, the fixed internal gear 20, the movable internal gear 21, the output shaft 26, etc., it is easy in a relatively narrow space in the winding drum 6. The drive motor 11 and the speed reduction mechanism 12 can be incorporated in the motor.

In the present embodiment, the planetary gear 15 is connected to the first planetary gear 16 and the second planetary gear 17 by fitting the involute serration shaft 16a into the involute serration hole 17a. 16 and the second planetary gear 17 may be connected by other methods, or the first planetary gear 16 and the second planetary gear 17 may be integrally formed.
Further, the speed reduction mechanism 12 of the present embodiment can be applied to a movable member drive device that decelerates the rotational driving force of the drive motor and transmits it to the movable member other than the shutter curtain drive device.
For example, the present invention can be applied to a case where a movable member such as a roll screen, a skylight that opens and closes, a lifting cabinet or the like is driven via the speed reduction mechanism 12 by a drive motor.

It is a front view of the shutter apparatus provided with the drive device of the shutter curtain which concerns on this invention. FIG. 2 is a front view of the shutter device with the case removed in FIG. FIG. 3 shows a shutter curtain driving device according to the present invention, and is a cross-sectional view of an X circle portion in FIG. 2.

Explanation of symbols

2 Shutter curtain 6 Winding drum 8 Case 10 Drive device 11 Drive motor 11a Drive shaft 12 Deceleration mechanism (wonder planetary gear mechanism)
14b Sun outer gear 15 Planetary gear 16 First planetary gear 17 Second planetary gear 20 Fixed internal gear 21 Movable internal gear 26 Output shaft

Claims (2)

A shutter curtain driving device for rotating a winding drum for winding and rewinding the shutter curtain around an axis,
A drive motor, and a reduction mechanism that transmits the rotational driving force of the drive motor to the winding drum at a reduced speed,
The reduction mechanism includes a sun outer gear fixed to the drive shaft of the drive motor, a planetary gear that meshes with the sun outer gear and revolves around the sun outer gear, and rotates around the planetary gear. A fixed internal gear in which the planetary gear meshes with the fixed internal gear, and a movable internal gear that is coaxially arranged in the fixed internal gear and rotatable about the axis, and meshes with the planetary gear, and the movable internal gear A shutter planetary drive mechanism, comprising: a strange planetary gear mechanism that includes an output shaft that is fixed to the rotation center of the shaft and that rotates the winding drum.   The shutter curtain drive device according to claim 2, wherein a cylindrical case is inserted into the winding drum, and the drive motor and the speed reduction mechanism are provided in the case. .

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