JP2005344837A - Electromagnetic disc brake and elevator hoisting machine provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic disc brake capable of removing dust such as sticking abrasion powder by a rotary disc. <P>SOLUTION: A low friction member is arranged between the rotary disc 3 and a rotary shaft 2 engaged on the rotary shaft 2 movable only in the shaft direction. Such constitution can easily slide the rotary disc 3 in the shaft direction on the rotary shaft 2. As a result, even if the dust sticks to an engaging part of the rotary disc 3 and the rotary shaft 2, the sticking dust can be scraped off and removed by braking of the rotary disc 3 and the movement in the shaft direction in braking opening. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic disc brake and an elevator hoist equipped with the electromagnetic disc brake, and in particular, a rotating disc engaged on a rotating shaft so as to be movable only in the axial direction is pressed against a fixed body by a spring force. The present invention relates to an electromagnetic disk brake configured to generate power, release the spring force by a magnetic force, release a rotating disk from a fixed body, and release a braking force, and an elevator hoisting machine including the same.

  In general, an electromagnetic disk brake that presses a rotating disk with a spring force and releases it with a magnetic force has already been proposed, for example, as shown in Patent Document 1.

JP 2002-258183 A

  The electromagnetic disk brake is engaged with a spline hub provided on the rotating shaft of the rotating disk. The rotating disk moves only in the axial direction on the spline hub in accordance with the braking and releasing of the electromagnetic disk brake. Is configured to rotate with the spline hub.

  In the above configuration, if wear powder such as brake lining that slides by pressing the rotating disk or surrounding dust adheres to the engaging part between the rotating disk and the spline hub, the rotating disk may get stuck on the spline hub. is there. As a result, the rotating disk remains in contact with some of the brake linings even when the brakes are released, causing not only the brake linings to wear abnormally but also generating sliding noise with the brake linings. . Further, when such an electromagnetic disk brake is used in an elevator hoist, contact with the rotating disk brake lining causes rotation spots in the drive motor, which deteriorates the riding comfort of the car.

  An object of the present invention is to provide an electromagnetic disc brake capable of removing dust such as attached abrasion powder with a rotating disc.

  In order to achieve the above object, the present invention provides a low-friction member between the rotating shaft and the rotating shaft, which is engaged on the rotating shaft so as to be movable only in the axial direction.

  With this configuration, the rotating disk can easily slide on the rotating shaft in the axial direction. As a result, even if dust adheres to the engaging portion between the rotating disk and the rotating shaft, the rotating disk is braked and braked. The dust adhering to the axial movement at the time of opening can be scraped off and removed.

  As described above, according to the present invention, the adhering dust can be removed by the rotating disk, so that it is possible to eliminate the inconvenience due to the solidity of the rotating disk.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  The electromagnetic disc brake 1 is roughly divided into a rotary disc 3 engaged with the rotary shaft 2 so as to be movable only in the axial direction, and an armature 6 that presses the rotary disc 3 toward the fixed body 5 by the spring force of the brake spring 4. The electromagnet 7 is configured to adsorb the armature 6 to release the pressing of the rotating disk 3.

  The rotating disk 3 is engaged with an outer periphery of a spline hub 8 fixed on the rotating shaft 1 so as to be movable only in the axial direction. The spline hub 8 has a plurality of concavities and convexities 9 formed in the circumferential direction on the outer periphery, and the concavities and convexities 9 are formed long and parallel to the axial direction of the spline hub 8. A fitting hole 10 that is slightly larger than the outer peripheral shape of the spline hub 8 is formed on the inner diameter side of the rotating disk 3, and the rotating disk 3 is rotated by fitting this into the spline hub 8. Although it can move on the shaft 2 in the axial direction, it engages in the circumferential direction and rotates together with the rotating shaft 2.

  The electromagnet 7 is composed of a fixed portion, for example, a yoke 11 supported on the fixed side of the electric motor, and a coil 12 wound around the yoke 11. The electromagnet 7 is fixed by fixing the yoke 11 to the fixed portion with the bolt 13. A bolt 14 is fixed to the yoke 11 so as to protrude on the opposite side to the fixed portion. The armature 6 is loosely passed through the bolt 14, and the fixed body 5 is fixed so as to have a predetermined distance from the magnetic pole surface of the electromagnet 7. And the spring hole 15 which accommodates the said braking spring 4 of the said yoke 11 is provided.

  Further, brake linings 16 and 17 are attached to the fixed body 5 and the armature 6 so as to oppose the rotating disk 3 from both sides.

  Here, the rotary disk 3 includes an outer diameter member 18 and an inner diameter member. The outer diameter member 19 is formed of a high friction material in order to obtain a high braking characteristic by the clamping pressure of the brake linings 16, 17, and the inner diameter member 19 is used to make the spline hub 8 easily slide in the axial direction. For example, it is made of a low friction synthetic resin material such as polyterolafluoroethylene.

  Next, the operation of the electromagnetic disc brake configured as described above will be described.

  FIG. 1 shows a braking state of the electromagnetic disk brake 1, and the armature 6 is pressed against the fixed body 5 by the spring force of the brake spring 4, whereby the outer diameter member 18 of the rotating disk 3 is fixed to the fixed body 5 and the armature. 6 brake linings 16 and 17 are strongly pressed. In this state, when the coil 12 of the electromagnet 7 is energized, the armature 6 is attracted to the electromagnet 7 against the spring force of the braking spring 4 by the magnetic force. The rotary disk 3 is released from the pinching pressure by being attracted to the electromagnet 7 of the armature 6 and can rotate together with the rotary shaft 2. As the rotary shaft 2 rotates, the rotary disk 3 is ejected from the two brake linings 16 and 17 that have been in contact with each other, or moves to an intermediate position between the brake linings 16 and 17 due to the reaction of releasing the clamping pressure.

  Here, since the inner diameter member 19 of the rotary disk 3 is formed of a low friction synthetic resin material, it can be easily moved in the axial direction on the spline hub 8 by a slight force of the brake linings 16 and 17. Therefore, every time the electromagnetic disk brake 1 is braked and released, dust adhering to the spline hub 8 can be scraped and removed by the movement of the rotating disk 3 without accumulating. Therefore, the rotating disk 3 does not get stuck on the spline hub 8, and the inconvenience due to the getting stuck of the rotating disk 3 can be eliminated.

  By the way, in the present embodiment, the inner diameter member 19 of the rotary disk 3 is formed of a low friction synthetic resin material. However, after the inner diameter member 19 is integrated with the same material as the outer diameter member 18, the spline hub is used. Even if the low friction synthetic resin material is baked or coated on the material surface of the inner diameter portion engaged with the plate 8, the same effect can be obtained.

  Further, the inner diameter member 19 of the rotating disk 3 may be formed of a metal material impregnated with a lubricant, and the inner diameter member 19 of the rotating disk 3 may be formed of a metal material having a lubricating function. Furthermore, conversely, the surface of the unevenness 9 of the spline hub 8 is coated with a low friction synthetic resin material, or the surface of the unevenness 9 of the spline hub 8 is impregnated with a lubricant or a metal material having a lubricating function. Or may be formed.

  In FIG. 1, reference numeral 20 denotes a rotary encoder connected to the rotary shaft 2.

  FIG. 4 shows an electric motor with an electromagnetic disc brake showing a second embodiment according to the present invention.

  Since the configuration of the electromagnetic disc brake 1 is the same as that described in the first embodiment, the description thereof is omitted. The electric motor 21 is a known induction motor or synchronous motor.

  FIG. 5 shows a third embodiment according to the present invention, and shows an elevator apparatus using an elevator hoisting machine equipped with an electromagnetic disc brake.

  The elevator apparatus includes a hoistway 22 formed in a building structure, a car 24 that moves up and down along a guide rail 23 erected in the hoistway 22, and a guide erecting in the hoistway 22. In the hoistway 22, a counterweight 26 that moves up and down along the rails 25, a main rope 27 that suspends the car 24 and the counterweight 26, a drive sheave 28 that is wound around the main rope 27 and driven, A hoisting machine 29 that is fixed and rotationally drives the driving sheave 28 is provided. And the hoisting machine 29 is equipped with the electric motor 21 with which the electromagnetic disc brake 1 is attached as shown in FIG.

  6 and 7 show modified examples of the rotating disk 3. FIG. 6 shows a case where the inner diameter member 19 of the rotary disk 3 is formed of a low friction synthetic resin material, and the inner diameter member 19 is formed by molding the low friction synthetic resin material on the inner diameter side of the outer diameter member 18. It is. In FIG. 6, when the inner diameter member 19 is a metal material, the outer diameter member 18 is shrink-fitted into the inner diameter member 19 and integrated.

  In FIG. 7, the outer diameter member 18 and the inner diameter member 19 are integrated by fastening with fastening means such as bolts.

  Of course, in FIG. 6 and FIG. 7, it is desirable to form a concavity and convexity between the outer diameter member 18 and the inner diameter member 19 so that slippage does not occur during torque transmission.

1 is a longitudinal side view showing a first embodiment of an electromagnetic disc brake according to the present invention. Sectional drawing of the upper half which follows the AA line of FIG. FIG. 2 is a vertical side view of the upper half of the rotating disk used in FIG. 1. The external appearance side view which shows the electric motor with an electromagnetic disc brake which is 2nd Embodiment by this invention. Schematic which shows the usage example of the hoist for elevators which is 3rd Embodiment by this invention. FIG. 3 is a view corresponding to FIG. 3 showing a modification of the rotating disk. FIG. 3 is a view corresponding to FIG. 3 and shows another modified example of the rotating disk.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic disc brake, 2 ... Rotating shaft, 3 ... Rotating disc, 4 ... Brake spring, 5 ... Fixed body, 6 ... Armature, 7 ... Electromagnet, 8 ... Spline hub, 16, 17 ... Brake lining, 18 ... Outer diameter Member, 19 ... inner diameter member, 21 ... electric motor, 28 ... drive sheave, 29 ... hoisting machine.

Claims (7)

  A rotating disk that is slidably engaged on the rotating shaft only in the axial direction, an armature that presses the rotating disk against a fixed body with a spring force, and an electromagnet that attracts the armature against the spring force. In the electromagnetic disc brake, a low friction member is provided between engaging portions of the rotary disc and the rotary shaft.   2. The electromagnetic disc brake according to claim 1, wherein the low friction member is made of a low friction synthetic resin material.   2. The electromagnetic disc brake according to claim 1, wherein the low friction member is made of a metal material impregnated with a lubricant.   2. The electromagnetic disc brake according to claim 1, wherein the low friction member is made of a metal material having a lubricating function.   5. The electromagnetic disk brake according to claim 1, wherein the low friction member is provided on an inner diameter side of the rotating disk.   A rotating disk that is slidably engaged only in the axial direction is provided on the rotating shaft that is integrally connected to the rotating shaft that supports the rotor or coaxially with the rotating shaft that supports the rotor, and the rotating disk is spring-loaded. In an electric motor with an electromagnetic disc brake provided with an armature that presses against a fixed body and an electromagnet that adsorbs the armature against the spring force, a low friction member is provided between the engaging portions of the rotary disc and the rotary shaft. An electric motor with an electromagnetic disc brake. A drive sheave around which a main rope for raising and lowering the car is wound, and an electric motor that rotationally drives the drive sheave. The shaft is on a rotary shaft that is integrally connected to the rotary shaft of the motor or coaxial with the rotary shaft of the motor. There is provided an electromagnetic disk brake having a rotating disk that is slidably engaged only in a direction, an armature that presses the rotating disk against a fixed body with a spring force, and an electromagnet that adsorbs the armature against the spring force. In the elevator hoisting machine, an elevator hoisting machine is characterized in that a low friction member is provided between engaging portions of the rotary disk and the rotary shaft.

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