JP2007153495A - Door driving device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door driving device for an elevator capable of improving durability and reducing cost while reducing the size of the device by stably supporting a drive shaft by a plurality of bearings. <P>SOLUTION: This door driving device for the elevator opens/closes a door arranged in an entrance of a cage by transmitting rotating torque generated in a stator 33 of an outer rotor-type electric motor 30 from a rotor 35 to the drive shaft 34 and rotating a drive pulley 28 fixed to the drive shaft 34. Both end parts 34a, 34b in the axial direction of the drive shaft 34 are rotatably held and supported by first and second bearings 36, 37, and the drive pulley 28 is arranged and fixed between the both bearings 36, 37. In addition, an angle detector 46 of the drive shaft 34 is provided between a small diameter part 34c in the other end part side of the drive shaft 34 and a bracket 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a door driving device that opens and closes a door disposed at an entrance / exit of an elevator cab.

  As a door opening / closing mechanism of this type of conventional elevator, the one described in the following Patent Document 1 previously filed by the present applicant is known.

  Describing the outline, as shown in FIG. 4, this door drive device includes an outer rotor type electric motor 1, a housing 3 fixed to a header 2 of an elevator door, and an inner portion of the housing 3 fixed to the center. A cylindrical wall 4, a stator 5 fixed to the outer periphery of the cylindrical wall 4, and a coil 5 a wound around an iron core, and a drive shaft rotatably supported by two front and rear bearings 6 and 7 inside the cylindrical wall 4. 8 and a rotor 9 disposed between the header 2 and the stator 5 and fixed to one end of the drive shaft 8.

  The rotor 9 is formed in a substantially cup shape, and the outer peripheral portion 9a of the disk-shaped body is bent at a substantially right angle so as to cover the outer peripheral surface of the stator 5, and the inner portion of the outer peripheral portion 9a is Permanent magnets 9b that face each other with a constant air gap with respect to the outer peripheral surface of the stator 5 are provided on the peripheral surface.

  Further, a driving pulley 10 around which a feeding belt 11 is wound is fixed to the other end of the driving shaft 8 with a screw, and the feeding belt 11 is not shown in a two-stage open / close type. It is connected to each hanger part of two doors.

  Further, the bearing 7 on the drive pulley 10 side is an annular bearing in which the inner end portion of the outer race is supported by the outer end portion of the cylindrical wall 4 and the outer end portion is fixed to the housing 2 by the bolt 12. It is supported by the presser 13.

Therefore, in the case of this door drive device, the electric motor 1 itself is thin, and a mechanism for decelerating is not required. Therefore, the door drive device can be arranged compactly in the upper part of the cab.
JP 2004-1982 (see FIG. 1)

  However, in the conventional door driving device, the bearings 6 and 7 are held inside the cylindrical wall 4 in a state of being close to each other in the axial direction, and the driving pulley 10 is connected to the other end of the driving shaft 8. It is attached to the front side in a cantilevered state.

  For this reason, there is a possibility that a large bending load is generated from the drive pulley 10 to the drive shaft 8 due to a relatively large load input from the feeding belt 11 side, causing shaft blurring. As a result, an eccentric load is input in the radial direction from the drive shaft 8 to the bearing 7 on the drive pulley 10 side in particular, and the support of the drive shaft 8 by the bearings 6 and 7 may become unstable.

  Therefore, the size and accuracy of both bearings 6 and 7 are inevitably increased, and the bearing retainer 13 is required on the bearing 7 side, resulting in an increase in the overall size and cost.

  Therefore, the present invention intends to provide an elevator door drive device that can improve the durability and reduce the cost while reducing the size of the device by stably supporting the drive shaft with a plurality of bearings. It is.

  As a means for solving the problems of the prior art, the invention according to claim 1 is that the rotational torque generated between the stator and the rotor of the electric motor is transmitted to the drive shaft and fixed to the drive shaft. An elevator door drive device that opens and closes a door disposed at an entrance / exit of a cab by rotating a drive rotator, and rotatably supports both ends in the axial direction of the drive shaft by a plurality of bearings. In addition, the drive rotating body is disposed and fixed between the bearings of the drive shaft.

  According to a second aspect of the present invention, the electric motor is fixed to a door header, and is disposed between the header and the stator, and a housing in which the stator is fixedly held via a cylindrical portion. The rotor having a permanent magnet facing the outer peripheral surface of the stator on the inner peripheral surface of the outer peripheral portion, and the drive shaft in which the center of the rotor is coupled to one end and the other end is coupled to the drive rotating body. And being supported by the first bearing fixed to the inner periphery of the cylindrical portion of the housing and supporting one end of the drive shaft, and a support portion protruding outward from the housing, The second bearing that pivotally supports the other end is provided.

  The invention according to claim 3 is characterized in that an angle detector for detecting the rotation angle of the drive shaft is provided on the shaft end side of the drive shaft opposite to the rotor.

  According to the first aspect of the present invention, both ends of the drive shaft provided with the drive rotator at substantially the center in the axial direction are supported by the plurality of bearings, so that the drive shaft is brought into a doubly supported state by the respective bearings. Since it can be supported, even if a large load is input to the drive rotating body from the feeding belt, the drive shaft can always be stably supported by each bearing, and the drive shaft can be prevented from falling in the radial direction. Is possible.

  As a result, the bearing load of each bearing is reduced, and each bearing can be made sufficiently small. As a result, the entire apparatus can be reduced in size and the cost can be reduced.

  In addition, in this invention, it is also possible to apply to an inner rotor type | mold other than an outer rotor type | mold as an electric motor.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since a high torque outer rotor type is used as the electric motor, the electric motor can be reduced in thickness, and the bearing can be reduced in size. Together, it is possible to promote downsizing of the entire apparatus.

  According to the third aspect of the present invention, the angle detector is provided on the shaft end side opposite to the rotor of the drive shaft so as to directly detect the rotation angle of the drive shaft. The angle (rotation speed) can be detected with high accuracy, and the presence of the angle detector eliminates the need to increase the length of the device in the axial direction, thereby reducing the length of the entire device in the axial direction. become.

  Hereinafter, an embodiment of an elevator door drive device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a door driving device according to the present embodiment, FIG. 2 is a perspective view of the door driving device, and FIG. 3 is an example of a door opening / closing mechanism to which the door driving device is applied. is there.

  First, the structure of the door opening / closing mechanism will be briefly described with reference to FIG. 3. The door opening / closing mechanism is a two-stage opening / closing mechanism including a first door 21a that operates at a high speed and a second door 21b that operates at a low speed. 21a and 21b are suspended and supported by rails 22 arranged on the header 20 at the top of the cab via hangers 23 and 23.

  The hanger 23 on the first door 21a side is directly connected to a feeding belt 24 which is one form of a power transmission band of the door drive device, while the hanger 23 on the second door 21b side is an interlock mechanism 25. The slider 26 is linked to the feeding belt 24 via the slider 26.

  The interlocking mechanism 25 operates the slider 26 at a speed about one half of the feeding speed of the feeding belt 24 by the action of the pair of auxiliary pulleys 27a and 27b around which the feeding belt 24 is folded. Since the structure itself of the interlocking mechanism 25 is well known, a detailed description thereof will be omitted.

  The feeding belt 24 is stretched over a driving pulley 28, a driven pulley 29, which will be described later, which are driving rotary bodies, and the auxiliary pulleys 27a and 27b, and is fed by the driving rotation of the driving pulley 28. Yes.

  The door driving device is mainly configured by the feeding belt 24, the driving pulley 28, and an electromagnetically driven electric motor 30.

  The motor 30 is an outer rotor type similar to the conventional one, but its bearing structure and the like are greatly different from those of the conventional one.

  That is, as shown in FIGS. 1 and 2, the electric motor 30 includes a housing 31 that is fixed to the header 20, a cylindrical wall 32 that is integrally fixed to substantially the center of the housing 31, and the cylindrical wall 32. A stator 33, which is a substantially annular plate-shaped stator fixed to the outer periphery, a drive shaft 34 inserted through the cylindrical wall 32, and the header 20 and the stator 33. A rotor 35 fixed to one end portion 34a of the drive shaft 34 and a pair of first bearing 36 and second bearing 37 that rotatably support the axial direction of the drive shaft 34 are provided.

  The housing 31 is formed in a substantially bowl shape, and a bolt insertion hole 31b through which a mounting bolt 38 fixed to the header 20 is inserted into a flange portion 31a integrally provided at the four corners of the outer periphery on the rear end side. Is formed.

  Further, a pair of substantially arc-shaped support legs 39, 39 are disposed and fixed to the front end portion of the housing 31 so as to face the axially symmetric position with a predetermined gap. The support legs 39, 39 are each provided with a bracket 40, which is a support portion, by a plurality of bolts 41 on the outer end sides thereof. The bracket 40 has a substantially elliptic plate shape, a support hole 42 is formed through the center, and a substantially cup-shaped cover portion 43 is fixed to the outer peripheral side of the support hole 42 on the outer surface by screws 44. .

  The stator 33 is fitted and fixed in an annular fitting groove formed on the outer periphery of the cylindrical wall 32 at the inner peripheral portion, and a plurality of slots formed in the radial direction are provided on the outer peripheral side. A coil wire 33a is wound therethrough.

  The drive shaft 34 has a reduced diameter one end 34 a rotatably supported by the first bearing 36, while a similarly reduced diameter other end 34 b is rotatably supported by the second bearing 37. Thus, the drive shaft 34 is supported in a both-end supported state. The drive pulley 28 disposed between the support legs 39, 39 is coupled to the center of the drive shaft 34 in the axial direction by a key (not shown).

  The rotor 35 is formed in a substantially cup shape, and the central portion of the disc-shaped main body is fixed to one end portion 34a of the drive shaft 34 from the axial direction by a fixing bolt 45, and the outer peripheral portion 35a is the stator. A permanent magnet 35b is formed to be bent at right angles so as to cover the outer peripheral surface of 33, and on the inner peripheral surface of the outer peripheral portion 35a, a permanent magnet 35b is opposed to the outer peripheral surface of the stator 33 with an air gap as a magnetic space having a constant width. Is provided.

  The first and second bearings 36 and 37 are each constituted by a ball bearing in which a plurality of balls are interposed between an outer race and an inner race. The first bearing 36 has an inner race of the drive shaft 34. While the outer race is fixed to the outer periphery of the one end 34a, the outer race is fitted and fixed in an annular fixing groove formed on the inner peripheral surface of the cylindrical wall 32 to restrict axial movement. In the second bearing 37, the inner race is fixed to the outer periphery of the other end portion 34 b of the drive shaft 34, while the outer race is fitted and fixed to the fitting groove provided on the inner peripheral surface of the support hole 42 of the bracket 40. Thus, movement in the axial direction (outward) is restricted.

  The other end 34a of the drive shaft 34 opposite to the rotor 35 is disposed inside the cover 43 and directly detects the rotation angle (rotation speed) of the drive shaft 34. An angle detector 46 is provided. The angle detector 46 uses a built-in type resolver, and has a small-diameter cylindrical detected portion 46a attached to the outer periphery of a small-diameter portion 34c that is coaxially integrated with the other end 34 of the drive shaft 34; A large-diameter cylindrical detection part 46a is provided at a substantially central position on the outer surface of the bracket 40 and surrounds the detected part 46a with a certain annular gap.

  Hereinafter, the operation of the present embodiment will be described. When drive torque is generated between the stator 33 and the rotor 35 by energization control of the coil 33a of the stator 33 of the electric motor 30, the drive torque is transmitted from the rotor 35 to the drive pulley 28 via the drive shaft 34. By rotating the pulley 28, the feeding belt 24 is fed and moved, whereby the first and second doors 21a and 21b are controlled to be opened and closed by the direction and speed according to the generated torque.

  At this time, since the drive shaft 34 is supported by the first and second bearings 36 and 37 in a both-end supported state, even if a large load is input from the feeding belt 24 via the drive pulley 28, The first and second bearings 36 and 37 provide a stable support state at all times, and the drive shaft 34 can be reliably prevented from falling in the radial direction.

  Thereby, since the support load of the drive shaft 34 of each bearing 36 and 37 becomes small, it becomes possible to make the structure of each bearing 36 and 37 sufficiently small. As a result, the entire apparatus can be reduced in size, and the durability can be improved and the manufacturing cost can be reduced.

  In addition, in this embodiment, since the high-torque outer rotor type is used as the electric motor 30, the electric motor can be reduced in thickness, and in combination with the downsizing of the bearings 36 and 37, the entire apparatus can be reduced in size. Can do.

  Furthermore, since the angle detector 46 is provided between the small diameter portion 34c of the drive shaft 34 and the bracket 40, the rotation angle (speed) of the drive shaft 34 is directly detected. The angle can be detected with high accuracy, and the angle detector 46 does not greatly protrude outward from the bracket 40, but only slightly protrudes, thereby increasing the axial length of the apparatus. This eliminates the need for this and, together with the reduction in thickness of the electric motor, makes it possible to sufficiently reduce the axial length of the entire apparatus.

  Since the housing 31, the cylindrical wall 32, and the supporting leg portions 39, 39 are integrally formed by molding or the like, the molding operation is facilitated and the assembly operation is also easier as compared with the case of separating and molding. .

  The present invention is not limited to the configuration of the embodiment described above. For example, the angle detector 46 can be configured by an optical sensor using an optical encoder or the like. Further, the number of the bearings is not limited to two, and three or more may be provided.

  Further, the drive rotating body is not limited to the drive pulley, and may be a gear gear, for example.

It is a longitudinal section showing an embodiment of a door drive device concerning the present invention. It is a perspective view of the apparatus which shows the embodiment. It is a front view which shows the outline of the door opening and closing mechanism to which the door drive device of this embodiment is applied. It is a longitudinal cross-sectional view which shows the conventional door drive device.

Explanation of symbols

20 ... Header 24 ... Feed belt 28 ... Drive pulley (drive rotor)
DESCRIPTION OF SYMBOLS 30 ... Electric motor 31 ... Housing 32 ... Cylindrical wall 33 ... Stator 34 ... Drive shaft 35 ... Rotor 36 ... 1st bearing 37 ... 2nd bearing 39 ... Supporting leg part 40 ... Bracket (support part)
46 ... Angle detector

Claims (3)

The rotational torque generated between the stator and rotor of the electric motor is transmitted to the drive shaft, and the drive rotating body fixed to the drive shaft is rotated to drive the door disposed at the entrance / exit of the cab. An elevator door drive device,
An elevator door drive device, wherein both ends of the drive shaft in the axial direction are rotatably supported by a plurality of bearings, and the drive rotating body is disposed and fixed between the bearings of the drive shaft. The electric motor is fixed to a door header, and is disposed between the header and the stator, and a housing in which the stator is fixedly held via a cylindrical portion. An outer periphery of the stator is disposed on an inner peripheral surface of the outer peripheral portion. Fixed to the inner periphery of the cylindrical portion of the housing, the rotor having a permanent magnet facing the surface, the drive shaft having one end coupled to the center of the rotor and the other end coupled to the drive rotating body The first bearing that pivotally supports one end of the drive shaft, and the second bearing that is supported by a support portion protruding outward from the housing and pivotally supports the other end of the drive shaft; The elevator door drive device according to claim 1, comprising: 3. The elevator door drive device according to claim 1, wherein an angle detector that detects a rotation angle of the drive shaft is provided on a shaft end side of the drive shaft opposite to the rotor. 4.

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