JP2001287882A - Belt type door opening and closing drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt type door opening and closing device capable of being silent and compact and exhibiting a mechanical safety function in case of an emergency. SOLUTION: This belt type door opening and closing drive unit opens and closes the door of an elevator or the like by driving a belt (timing belt) 17 by the output of a motor unit 2. In this device, sun rollers 31 and 41, a plurality of epicyclic rollers 32 and 42 rotatably supported by carriers 35 and 45 and circumscribed to the sun rollers, and epicyclic roller mechanisms 30 and 40 for transmitting a power by the mutual rotation of ring rollers 33 and 43 to which the epicyclic rollers are inscribed are interposed between the motor unit 2 and the timing belt 17, so that the output from the motor unit 2 is received by the epicyclic roller mechanism 30 and the output of the epicyclic roller mechanism 40 is transmitted to the timing belt 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-type door opening / closing drive device used, for example, for opening / closing an elevator door.

[0002]

2. Description of the Related Art Conventionally, as a belt-type door opening / closing drive device for opening / closing an elevator door, the output of a motor is reduced by a (multi-stage) belt and pulleys, and a belt opening / closing belt (belt) is provided by the reduced speed output. A door that opens and closes by driving a toothed belt (generally called a timing belt) or a door that opens and closes by driving a door opening and closing belt by a deceleration output of a geared motor is known. .

In general, an elevator door opening / closing drive device is provided with a sensor for detecting that a person or an object is caught in the door, and this sensor detects that a person or an object is caught. In some cases, the drive opens the door of the elevator.

[0004]

Among the above-mentioned conventional driving devices, those which transmit a motor output to a door opening / closing belt (timing belt) by a combination of a belt and a pulley are input-side and output-side pulleys. Since the speed is reduced by changing the diameter, if the reduction ratio is set to be high, there is generally a limit to reducing the diameter of the pulley on the input side. There is no problem. Therefore, there is a problem that it is difficult to reduce the size and the cost is likely to increase.

Although a geared motor can be more compact than a combination of a multi-stage belt and a pulley, it is noisy and has a mechanical safety function in the event of a sensor failure as will be described later. There is a problem that does not work.

An object of the present invention is to provide a drive device for opening and closing an elevator door which can reduce noise and make it compact in consideration of the above circumstances, and can exert a mechanical safety function in the event of an emergency. I do.

[0007]

According to a first aspect of the present invention, there is provided a belt-type door opening / closing drive device for opening and closing a door by driving a belt by output rotation of a motor unit. A sun roller, a plurality of planetary rollers rotatably supported by a carrier and circumscribing the sun roller, and a planetary roller unit that transmits power by mutual rotation of a ring roller inscribed by the planetary roller, and the motor unit The above problem is solved by receiving the output from the planetary roller unit and transmitting the output of the planetary roller unit to the belt.

In the present invention, between the motor unit and a door opening / closing belt (generally a timing belt called a timing belt; however, the present invention is not limited to a toothed belt, and is hereinafter referred to as a timing belt for convenience). And a planetary roller unit as a power transmission means. Since the planetary roller unit can have a large reduction ratio in a compact form, the entire drive device can be easily made compact.

Further, the planetary roller unit transmits power by mutual rotation (friction rotation or traction rotation) of the sun roller, the planetary roller and the ring roller, and therefore has a high silent effect as a whole.

Further, the planetary roller unit has an effect of blocking vibration transmitted between the input side and the output side by the contact surface between the rollers. That is, transmission of the vibration generated by the input side motor unit to the timing belt side,
In addition, transmission of vibration generated on the timing belt side (door side) on the motor unit side is blocked by the planetary roller unit. Therefore, due to the vibration cutoff, "people vibrating at mutually different natural frequencies interact with each other to generate vibration / noise greater than the vibration / noise level generated in each part." As a result, the so-called resonance phenomenon can be prevented from occurring, and as a result, the quietness of the entire driving device can be greatly improved.

Further, due to the structural characteristics of the planetary roller unit, when a large load is applied to the output side, each roller slides and no more torque is transmitted. For this reason, even if a sensor or a failure detects that a person or object is caught in the door, it is not possible to stop or reverse the rotation of the motor and control the motor unit when the person or object is caught. Even if a situation occurs in which the vehicle keeps turning, it is possible to prevent a large torque from being applied to a person or an object sandwiched therebetween. That is, a mechanical safety function in the event of an emergency can be exhibited. This function is particularly effective when the torque of the motor is set relatively large with emphasis on the response speed of door opening and closing.

According to a second aspect of the present invention, in the first aspect, the planetary roller unit is of a frame rotating type for rotating a frame member on its own outer periphery, and the frame member rotates integrally with the ring roller. Thus, the above problem is solved by forming a pulley for driving the timing belt on the frame member itself.

In the present invention, since the pulley for driving the timing belt is formed on the frame member itself connected to rotate integrally with the ring roller, there is no need to provide a pulley separately from the driving device. Therefore, as compared with a case where a pulley is separately provided and connected to the driving device, the driving system can be made more compact, the configuration can be simplified, the number of parts can be reduced, and the cost can be reduced.

According to a third aspect of the present invention, in the second aspect, the planetary roller units are provided in multiple stages, and the output rotation of the motor unit is received by the sun roller of the first stage planetary roller unit of the multiple stage planetary roller units. After sequentially connecting the carrier of the planetary roller unit of the preceding stage including the first stage with the sun roller of the planetary roller unit of the next stage, fixing the carrier of the planetary roller unit of the last stage, and at least the ring of the planetary roller unit of the last stage The object has been solved by configuring the frame member to be rotatable by connecting a roller to the frame member so as to be integrally rotatable.

In the present invention, since the planetary roller units are provided in multiple stages, it is possible to easily increase the reduction ratio while preventing the outer diameter of the entire driving device from increasing. Further, since the number of frictional contact portions between the rollers increases, the function of safety due to the sliding of the rollers and the performance of vibration absorption can be improved. Furthermore, since the planetary roller units of a plurality of stages are arranged in the axial direction, the bearing function of the planetary roller unit itself is enhanced, so that the rotational stability of the frame member is further improved.

According to a fourth aspect of the present invention, in the second aspect, the motor unit and the planetary roller unit are arranged adjacent to each other on the same axis, and the output shaft of the motor unit is set at the center of the planetary roller unit. This problem has been solved by inserting the carrier of the planetary roller unit into the motor unit by inserting the carrier into the input shaft of the unit.

According to the present invention, since the main members of the motor unit and the planetary roller unit are connected to each other, the size of the motor unit and the number of parts can be further reduced.
High rigidity and cost reduction can be realized.

According to a fifth aspect of the present invention, in the third aspect, the motor unit and the multi-stage planetary roller unit are arranged on the same axis in the order of the motor unit, the last stage of the planetary roller unit, the preceding stage,. Placed next to each other,
The output shaft of the motor unit is inserted as an input shaft into the first stage planetary roller unit which is arranged at the position farthest from the motor unit through the center of the shaft of the planetary roller units of all stages, and is inserted into the final stage planetary roller unit. The object has been solved by fixing the carrier of the unit to the motor unit.

According to the present invention, the main members of the motor unit and the planetary roller unit are connected to each other, so that further reduction in size, reduction in the number of parts, higher rigidity, and cost reduction are realized. it can. In particular, in the case of the present invention, since the planetary roller units are provided in multiple stages as a premise, there is a general tendency that it is difficult to align the axis of the entire driving device. Since they are arranged so as to penetrate the center of the shaft, the centers of the rotating shafts of the respective rotating members in the drive device can be easily matched.

According to a sixth aspect of the present invention, in any one of the third to fifth aspects, a mounting flange for mounting the driving device to a fixing member is formed on an anti-planetary roller unit side of the carrier fixed to the motor unit, In addition, the above problem is solved by using the mounting flange as a part of the casing of the motor unit.

According to the present invention, the mounting form can be made more compact as compared with the case where a mounting base or the like is separately provided and fixed on the motor unit side.

Further, the mounting flange is directly integrated with the carrier of the planetary roller unit. Therefore, by fixing this mounting flange to a fixing member such as an elevator car, the distance between the bolt position of the mounting flange and the position of the frame member to which the load is applied can be shortened. Therefore, as compared with a case where a mounting base or the like is separately provided and fixed on the motor unit side, the reaction force moment related to the mounting base can be made smaller, and a rational design with high mounting stability can be achieved.

In addition, according to the present invention, since the mounting flange formed on the carrier of the planetary roller unit is used as a part of the casing of the motor unit, the number of parts can be reduced. In addition, since the unity of the motor unit and the planetary roller unit can be increased, the rigidity of the entire apparatus can be further increased.

According to a seventh aspect of the present invention, the above-mentioned object is achieved by providing the motor unit according to any one of the first to sixth aspects, wherein the motor unit comprises a flat motor having a reduced axial dimension.

In the present invention, since the axial size can be reduced by adopting the flat motor as the motor unit, the axial size of the entire driving device can be further reduced while utilizing the characteristics of the planetary roller unit. .

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of an elevator door opening / closing drive unit (elevator belt type door opening / closing drive device) 1 of the embodiment, and FIG. 2 is a sectional view taken along the line II-II of FIG. is there.

As shown in FIG. 1, this drive unit 1
A motor unit 2 composed of a flat brush motor having a reduced axial dimension and a power transmission unit 3 including a two-stage planetary roller mechanism (planetary roller unit) are axially adjacent to each other and united to form a single unit. It is configured as

The power transmission unit 3 employs a structure for transmitting power by friction transmission of a plurality of rollers, and generally belongs to a power transmission type called a traction drive (T / D).

The power transmission unit 3 includes the rotary casing 1
1 and a mounting flange 12.

The rotary casing (frame member) 11 is composed of a rotary frame 13 and a bearing casing 14, both of which are formed in a ring shape. The rotating frame 13 and the bearing casing 14 are spigot-fitted side by side in the axial direction, and are integrally connected together with an end face cover 15 that seals the end face of the rotating frame 13 by through bolts 16.

The mounting flange 12 is for fixing the drive unit 1 of the present embodiment to an elevator car (fixing member 100), and is arranged on the power transmission unit 3 on the motor unit 2 side. The specific structure of the mounting flange 12 will be described later in detail.

The power transmission unit 3 is of a frame rotating type that takes out a rotational output from a rotary casing 11 located on the outer peripheral portion of the unit, and has a toothed timing on the outer periphery of the rotary frame 13 for opening and closing the elevator door. Belt 17
Is integrally formed with the pulley 18 around which the pulley 18 is wound.

An input shaft 20 is arranged at the center of the rotation frame 13. The input shaft 20 is obtained by extending the motor shaft 60, and the power transmission unit 3 is provided from the motor unit 2 side.
Side is inserted. In other words, the input shaft 20 has one end (the left end in the drawing) functioning as the motor shaft 60.

In the rotary frame 13, two stages of planetary roller mechanisms (planetary roller units) 30, 40 of a first reduction stage and a second reduction stage are provided on the outer periphery of the input shaft 20.

A planetary roller mechanism (hereinafter, referred to as a "first planetary roller mechanism") 30 of a first reduction gear (first stage) is disposed at the tip end of the input shaft 20 when viewed from the motor unit 2 side. Planetary roller mechanism of 2 speed reduction stage (final stage)
The “second planetary roller mechanism” 40 is disposed closer to the motor unit 2 than the first planetary roller mechanism 30 is.

That is, after all, the motor unit 2, the second planetary roller mechanism 40, and the first planetary roller mechanism 30 are arranged adjacent to each other on the same axis in this order, and the output shaft 60 of the motor unit 2 is , General planetary roller mechanisms 30, 4
The input shaft 20 is inserted into the planetary roller mechanism 30 that is located farthest from the motor unit 2 through the center of the 0 axis.

The first planetary roller mechanism 30 includes the input shaft 20
Cylindrical sun roller 3 splined to the tip of
1 and a plurality (four in this example) circumscribing the sun roller 31
Planetary roller 32, a ring roller 33 in which the planetary roller 32 is inscribed, and a carrier 35 that rotatably supports all the planetary rollers 32 via carrier pins 34, respectively.
Power is transmitted by the mutual rotation of the sun roller 31, the planetary roller 32, and the ring roller 33.

The second planetary roller mechanism 40 includes the input shaft 20
Cylindrical sun roller 41 which is loosely fitted to the outer periphery of the first planetary roller mechanism 30 and spline-coupled to the carrier 35 of the first planetary roller mechanism 30
And a plurality of planetary rollers 42 circumscribing the sun roller 41
A ring roller 43 in which the planetary roller 42 is inscribed;
A carrier 45 that rotatably supports all the planetary rollers 42 via respective carrier pins 44;
Power is transmitted by mutual rotation of the sun roller 41, the planetary roller 42, and the ring roller 43.

The carrier pins 34 and 44 of the first and second planetary roller mechanisms 30 and 40 have their base ends connected to carriers 35 and 45 disposed closer to the motor unit 2 than the planetary rollers 32 and 42, respectively. Cantilevered. Planet rollers 32, 42 are rotatably mounted on the outer periphery of the distal ends of the carrier pins 34, 44 via sliding members (pin rollers) 36, 46, respectively.

The ring rollers 33 and 43 of the first and second planetary roller mechanisms 30 and 40 are formed integrally on the inner periphery of the rotating frame 13. In addition, here, in order to share parts, the sizes of the sun rollers 31, 41, the sizes of the planetary rollers 32, 42, and the sizes of the ring rollers 33, 43 in the first and second planetary roller mechanisms 30, 40 are respectively set. They are set equal.

The planetary roller 3 of the first planetary roller mechanism 30
A certain space is held between the planetary rollers 42 of the second planetary roller mechanism 40 and the planetary rollers 42 of the second planetary roller mechanism 40 by the spacer 22 fitted on the inner periphery of the rotating frame 13, and the first planetary roller mechanism 30 Carrier 35 is stored.

An axial position of each of the planetary rollers 32 and 42 is determined by a stopper ring 51 fitted to the end face cover 15,
It is regulated by the spacer 22 and a stopper ring 52 fitted on the inner periphery of the bearing casing 14. or,
The axial positions of the sun rollers 31 and 41 are regulated by a stopper ring 53 fitted to the end face cover 15 and a stopper ring 54 fitted to the inner periphery of the carrier 45 of the second planetary roller mechanism 40. .

The carrier 45 of the second planetary roller mechanism 40
Is a cylindrical member, the inner circumference of the carrier 45 and the input shaft 20.
A rolling bearing 23 is disposed between the rolling bearing 23 and the outer periphery of the rolling bearing 23.
A rolling bearing 24 is arranged between the outer periphery of the carrier 45 and the inner periphery of the bearing casing 14 which is a part of the rotary casing (frame member) 11.

As described above, the input shaft 20 is rotatably supported by the carrier 45 by the bearings 23 and 24 on the inner and outer circumferences of the carrier 45, and the rotating frame 13 and the bearing casing 1
The rotating casing 11 made of 4 is rotatably supported by the carrier 45. In addition, since the first and second planetary roller mechanisms 30 and 40 themselves function as bearings, the rotation of the input shaft 20 and the rotary casing 11 is prevented even at a position apart from the bearings 23 and 24. .

The rolling bearing 24 interposed between the carrier 45 and the bearing casing 14 is connected to the carrier 4 by step portions 25 and 26, a spacer 27, a snap ring 28 and the like.
The bearing 24 is fixed to the bearing casing 14 so as not to move in the axial direction, and the bearing 24 supports all the thrust load applied from the rotating casing 11 side. Therefore, the transmission of the thrust load to the planetary roller mechanisms 30 and 40 can be blocked.

A seal member 55 is provided between the carrier 45 and the bearing casing 14 so as to be located outside the bearing 24 when viewed from the planetary roller mechanisms 30 and 40 and to shield the outside from the outside (described later). Also, the carrier 45 and the input shaft 20
Between the bearing 2 and the planetary roller mechanisms 30 and 40.
A seal member 56 that is positioned inside the motor unit 3 and blocks the motor unit 2 is disposed. Sealing member 55,
In the space isolated by 56, the planetary roller mechanisms 30, 40
A special grease is enclosed to improve the traction function of each roller.

Here, the contrivance on the structure of the mounting flange 12, including the structure on the arrangement of the seal member 55 described above, will be described.

The mounting flange 12 is for fixing the drive unit 1 of the present embodiment to the car-side fixing member 100 of the elevator as described above, and is disposed on the motor transmission unit 3 side of the power transmission unit 3. I have. The mounting flange 12 is configured to also serve as a motor base 61 which is a part of the casing of the motor unit 2, and is orthogonal to the axial direction of the drive unit 1.

The mounting flange 12 is formed integrally with one end of the carrier 45 of the second planetary roller mechanism 40. Therefore, by fixing the mounting flange 12 to the fixing member 100 on the car side of the elevator, the carrier 45 of the second planetary roller mechanism 40 is held in a fixed state, and the rotation output can be taken out from the rotary casing 11. The motor unit 2 is also fixed to the car-side fixing member 100 via the mounting flange 12.

The side surface of the mounting flange 12 and the end surface of the bearing casing 14 are opposed to each other with a slight gap, and are formed in the annular recess 12a formed on the side surface on the mounting flange 12 side and on the side surface on the bearing casing 14 side. The annular protrusion 14a enters without contact.

This is a device for securing a space for disposing the sealing member 55 for sealing between the bearing casing 14 and the carrier 45 by forming the annular convex portion 14a on the side surface on the bearing casing 14 side. That is, by forming the annular convex portion 14a on the bearing casing 14,
A space for disposing the seal member 55 is secured on the inner peripheral side, and an annular concave portion 12a is formed on the side surface on the mounting flange 12 side in order to avoid interference with the annular convex portion 14a.

By adopting such a configuration, it is possible to arrange the sealing member 55 without increasing the axial length, while ensuring a sufficient thickness of the mounting flange 12, thereby making the mounting flange 12 as small as possible. The axial size of the power transmission unit 3 is reduced by disposing the power transmission unit 3 close to the bearing casing 14.

Next, the configuration of the motor unit 2 will be described.

The motor unit 2 comprises a flat brush motor as described above, and the motor base 61 and the motor cover 63 constitute a motor casing.
In the motor base 61, the mounting flange 12 itself is also used as it is.

The motor unit 2 has a well-known basic structure, and includes a motor shaft 60 integrated with the input shaft 20 of the power transmission unit 3 and an end of the motor shaft 60 opposite to the power transmission unit 3. Bearing 64 fitted to the center of motor cover 63 to support the motor;
3, a thin disk-shaped rotor 65 integrally connected to the outer periphery of the motor shaft 60, and a stator 6 fixed to the inner surface of the motor cover 63 so as to face the side surface of the rotor 65.
6, a brush 67 for supplying a current to a coil (not shown) of the rotor 65, and a spring 68 for bringing the brush 67 into contact with the contact point of the boss of the rotor 65.

The rotor 65 and the bearing 23 on the outer periphery of the input shaft 20 on the side of the power transmission unit 3 have a rotor 65 between them.
A spacer 69 is provided for determining the position.

The drive unit 1 described above is mounted on an elevator car, for example, as shown in FIG. 3, by fixing the mounting flange 12 to the fixing member 100.

FIG. 3 shows an example of use of the drive unit 1.

In FIG. 3, 101 and 102 are elevator doors, 17 is a timing belt, and 103 and 104 are connecting members between the door and the timing belt. The timing belt 17 is wound between the two pulleys 105 and 106 that are separated from each other. The drive unit 1 is disposed at the position of one of the pulleys 106, and is integrally formed on the rotary frame 13 of the rotary casing 11 as the pulley 106. The used pulley 18 is used. In this mechanism, the doors 101 and 102 can be opened and closed synchronously by driving the timing belt 17 by the drive unit 1.

Next, the operation of the drive unit 1 will be described.

Referring to FIG. 1, when the motor shaft 60 of the motor unit 2 rotates, the rotation is
Is input to the sun roller 31 of the planetary roller mechanism 30 of FIG.
If it is assumed that the rotating frame 13 is fixed, the sun roller 3
The rotation input to 1 is caused by the friction rotation (traction rotation) between the rollers, and the planetary roller 32 → the carrier 35 →
The light is transmitted in the order of the sun roller 41 → the planetary roller 42 → the carrier 45 of the second planetary roller mechanism 40. However, since the carrier 45 is actually fixed, the planetary rollers 3
By the rotation of 2, 42, the ring rollers 33, 43, that is, the rotating casing 11 having the rotating frame 13 rotates,
When the timing belt 17 is driven, the doors 101, 10
2 is opened and closed.

In this case, since the power transmission unit 3 including the planetary roller mechanisms 30 and 40 is used as the power transmission means between the motor unit 2 and the timing belt 17, a quiet operation can be performed. . That is, since the planetary roller mechanisms 30, 40 transmit power by mutual rotation (friction rotation or traction rotation) of the sun rollers 31, 41, the planetary rollers 32, 42, and the ring rollers 33, 43, they are themselves. And the transmission of the vibration generated by the motor unit 2 to the timing belt side and the transmission of the vibration generated by the timing belt side to the motor unit side are performed by the planetary roller mechanisms 30 and 40. Will be shut off. Therefore, a so-called resonance phenomenon that "persons vibrating at mutually different natural frequencies interact with each other to generate vibration / noise greater than the vibration / noise level generated in each part" Can be prevented from occurring, and as a result, the quietness of the entire drive device from the motor unit to the timing belt and thereafter can be greatly improved.

On the other hand, if an excessive load acts on the timing belt 17 when the doors 101 and 102 are closed, an increase in the load on the rotary casing 11 causes
Each of the rollers 31, 32, 33, 41, 42, 43 slips. For this reason, even if a person or an object is caught between the doors 101 and 102 due to a failure in the sensor system or the like, control for stopping rotation of the motor shaft 60 cannot be performed. Even if a situation occurs in which the unit 2 keeps rotating, it is possible to prevent a large torque from being applied to a person or an object sandwiched therebetween. That is, a mechanical safety function in the event of an emergency can be exhibited.

Further, the power transmission unit 3 having the planetary roller mechanisms 30 and 40 built therein can be made compact and can have a large reduction ratio, so that the whole drive system can be easily made compact with the use of a flat motor. It can be aimed at.

Further, since the mounting flange 12 integrated with the carrier 45 is used as a part of the casing of the motor unit 2 (motor base 61), the motor unit 2 and the power transmission unit 3 are reduced while reducing the number of parts. Can be increased. Moreover, since the drive unit 1 is installed by fixing the mounting flange 12 to the fixing member 100 on the car side of the elevator, the mounting form can be made compact and a reasonable design can be achieved. .

More specifically, first, the mounting flange 12
Is located at the axially intermediate position between the planetary roller mechanisms 30 and 40 and the motor unit 2, so that the cantilever distances L1 and L2 from the mounting flange 12 are reduced. As a result, the load in the radial direction and the thrust direction related to the rotating frame 13 is particularly received at a position not far from the mounting flange 12, and the reaction force moment applied to the bolt 62 of the mounting flange 12 can be reduced. Therefore, the installation stability when the drive unit 1 is mounted on the elevator car is higher than when the mounting base or the like is separately provided and fixed on the motor unit side.

Next, a) the mounting flange 12, the carrier 45 of the planetary roller mechanism 40, and the casing 61 of the motor unit 2 are integrated and arranged in the center of the drive unit 1 so as to also serve as a part of each. b) The motor unit 2 and the multi-stage planetary roller mechanisms 30 and 40 based on the mounting flange 12
The planetary roller mechanisms (final stage) 40 and the initial stage 30 are arranged adjacent to each other on the same axis in this order, and c) the output shaft 60 of the motor unit 2 passes through the center of the planetary roller mechanisms 30 and 40 of all stages. The carrier 45 of the (final stage) planetary roller 40 is inserted into the first stage planetary roller mechanism 30 disposed farthest from the motor unit 2 as the input shaft 20 and is integrated with the (mounting flange 12). Since the configuration fixed to the motor unit 2 is employed, a rotating member (such as a rotor or a friction roller) is three-dimensionally assembled around the mounting flange 12 located at the center of the unit. The assembly rigidity of each rotating member can be maintained high, and the rotation stability and the stability of installing the elevator on the car can be further improved.

Further, since the pulley 18 for driving the timing belt 17 is formed directly on the rotary frame 13 which rotates integrally with the ring rollers 33 and 43, the drive unit 1
This eliminates the need for a separate pulley, thereby further reducing the size of the drive system, simplifying the configuration and reducing the number of parts, and contributing to cost reduction.

Further, since the rolling bearing 24 is arranged between the bearing casing 14 and the carrier 45 constituting the rotating casing 11, the planetary roller mechanisms 30, 40 are provided.
Load on the rotating casing 11 can be reduced.
The rotation support stability can be improved. That is, since the rolling bearing 24 receives all of the thrust load acting on the rotary casing 11 and a part of the radial load, the planetary rollers 32 and 42 can be installed even in a state where a large thrust load or a radial load is applied. Can be rotated stably.

Further, in this drive unit 1, since the planetary roller mechanisms 30, 40 are provided in two stages, the reduction ratio can be increased, and the number of frictional contact portions between the rollers increases. Increased safety due to slippage and improved vibration absorption performance.

Since the two-stage planetary roller mechanisms 30 and 40 are arranged in the axial direction, the bearing function of the planetary roller mechanisms 30 and 40 itself is enhanced, so that the rotational stability of the rotary casing 11 is enhanced.

In the case of the drive unit 1 of the above embodiment, two-stage planetary roller mechanisms 30 and 40 are provided.
The planetary roller mechanism may have only one stage, or may have three or more stages. In the case of three or more stages, the output rotation of the motor unit is received by the sun roller of the first stage planetary roller mechanism of the multistage planetary roller mechanism, and the carrier of the previous stage roller mechanism including the first stage is moved to the next stage. After being sequentially connected to the sun roller of the planetary roller mechanism, the carrier of the final stage planetary roller mechanism may be fixed, and all the ring rollers of each stage of the planetary roller mechanism may be connected to the rotating frame so as to be integrally rotatable. Even in such a case, the bearing 24 can be arranged between the outer periphery of the final stage carrier and the inner periphery of the bearing casing 14. Further, all the ring rollers of each stage may be connected, or only a part including the last stage may be connected.

In the above embodiment, the flat brush motor is used for the motor unit 2, but the present invention is not limited to this.

Further, even if the motor unit 2 and the power transmission unit 3 are not integrated to form one drive unit 1,
They may be separated and connected to each other.

[0076]

As described above, according to the present invention,
Since the planetary roller unit is interposed between the motor unit and the timing belt, noise reduction and compactness can be achieved while having a mechanical safety function at the time of overload.

[Brief description of the drawings]

FIG. 1 is a sectional view of a drive unit according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a configuration diagram illustrating an example of use of the drive unit according to the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drive unit (drive device) 2 ... Motor unit 3 ... Power transmission unit 11 ... Rotating casing (frame member) 12 ... Mounting flange 13 ... Rotating frame 14 ... Bearing casing 15 ... End face cover 17 ... Timing belt 18 ... Pulley 20 ... Input shaft 23 Rolling bearing 24 Rolling bearing 30 First planetary roller mechanism (planetary roller unit) 40 Second planetary roller mechanism (planetary roller unit) 31, 41 Sun roller 32, 42 Planetary roller 33, 43 ring roller 34, 44 carrier pin 35, 45 carrier 60 motor shaft 61 motor base (motor casing) 63 motor cover (motor casing) 65 rotor 66 stator 67 brush 100 fixing member

Claims (7)

[Claims] 1. A belt-type door opening / closing drive device which opens and closes a door by driving a belt with an output of a motor unit, wherein the sun-opening roller and a carrier rotatably support the sun between a motor unit and the belt. A plurality of planetary rollers circumscribing the sun roller, a planetary roller unit that transmits power by mutual rotation of a ring roller inscribed by the planetary rollers are interposed, and an output from the motor unit is received by the planetary roller unit. A belt type door opening / closing drive device, wherein an output of a planetary roller unit is transmitted to the belt. 2. The planetary roller unit according to claim 1, wherein the planetary roller unit is of a frame rotating type in which a frame member on the outer periphery of the unit rotates, and the frame member is connected to rotate integrally with the ring roller; A belt-type door opening / closing drive device, wherein a pulley for driving the belt is formed on the frame member itself. 3. The multi-stage planetary roller unit according to claim 2, wherein the planetary roller unit is provided in multiple stages, and the output rotation of the motor unit is received by a sun roller of a first-stage planetary roller unit of the multi-stage planetary roller unit, and includes the first stage. After sequentially connecting the carrier of the planetary roller unit of the preceding stage to the sun roller of the planetary roller unit of the following stage, fixing the carrier of the final stage of the planetary roller unit, and at least the ring roller of the planetary roller unit of the final stage is A belt-type door opening / closing drive device, wherein the frame member is configured to be rotatable by being integrally rotatably connected to the frame member. 4. The planetary roller unit according to claim 2, wherein the motor unit and the planetary roller unit are arranged adjacent to each other on the same axis, and an output shaft of the motor unit is provided around an axis of the planetary roller unit as an input shaft of the planetary roller unit. A belt-type door opening / closing drive device wherein the carrier of the planetary roller unit is inserted and fixed to the motor unit. 5. The motor unit according to claim 3, wherein the motor unit and the multi-stage planetary roller unit are a motor unit, a final stage of the planetary roller unit,
The first stage is arranged adjacent to the same axis in the order of the first stage,..., The first stage, and the output shaft of the motor unit is arranged at the farthest position from the motor unit through the shaft center of the planetary roller units of all stages. A belt-type door opening / closing driving device, wherein the carrier of the last stage planetary roller unit is fixed to a motor unit. 6. The mounting flange according to claim 3, wherein a mounting flange for mounting the driving device to a fixing member is formed on a side of the carrier fixed to the motor unit opposite to the planetary roller unit. A belt-type door opening / closing drive device, wherein the drive unit is used as a part of a casing of a motor unit. 7. A belt-type door opening / closing drive device according to claim 1, wherein said motor unit comprises a flat motor having a reduced axial dimension.