JP2007022772A - Hoisting machine for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provides a hoisting machine for an elevator, which reduces brake stroke amount during braking and non-braking, and also reduces the size of a brake device by approximately totally uniforming deformation of a rotating drum. <P>SOLUTION: This hoisting machine for the elevator is provided with: a housing 1 having a stator winding 5 on the inner peripheral face; a main shaft 2 provided inside the housing 1; the rotating drum 4 arranged inside the housing 1 and having a drive sheave 3 pivotally supported by the main shaft 2; a field magnet 6 arranged on the outer peripheral face of the rotating drum 4 so as to oppose to the stator winding 5 and constituting an electric motor together with the stator winding 5; a brake face 7 provided on the inner peripheral face of the rotating drum 4; and the drum type brake device 8 arranged so as to oppose to the brake face 7. A brake part of the drum type brake device 8 is divided into a plurality of portions, and each of brake linings 17 of the divided portions of the brake part is pressed against approximately overall face of the brake face 7 of the rotating drum 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In this invention, a driving sheave and a rotating drum are integrally formed and provided in a housing. A braking surface is provided on the inner peripheral surface of the rotating drum, and a drum-type braking device is disposed opposite to the braking surface. The present invention relates to an elevator hoist.

  In a conventional elevator hoist, a drum-type brake device disposed opposite to a braking surface on the inner peripheral surface of a rotating drum has a plurality of braking portions and a plurality of non-braking portions between the braking portions. The hoisting machine is braked by only a plurality of braking portions locally contacting the braking surface of the rotating drum (see, for example, Patent Document 1).

JP 2004-189418 A

  In the structure of the conventional elevator hoist described in Patent Document 1, since the non-braking part of the brake device does not contribute to the braking of the rotating drum at all, the force is transmitted to the rotating drum only by the braking part. Will be deformed and bend. When this deflection becomes large, a gap (brake gap) for preventing contact at the time of non-braking increases. And if this clearance gap becomes large, the amount of brake stroke will also become large and it will be necessary to enlarge electromagnetic attraction force, Therefore The brake device will be enlarged and it had become the obstacle of miniaturization.

  The present invention has been made to solve the above-described problems, and presses the braking operation section divided into a plurality of portions over almost the entire braking surface of the rotating drum, thereby substantially bending the rotating drum. By equalizing, the brake stroke amount during braking and during non-braking can be reduced, and an elevator hoisting machine capable of reducing the size of the brake device is provided.

  In the elevator hoist according to the present invention, a housing having a stator winding provided on the inner peripheral surface, a main shaft provided in the housing, and a drive disposed in the housing and pivotally supported by the main shaft A rotating drum having a sheave, a field magnet that is disposed on the outer peripheral surface of the rotating drum so as to face the stator winding, and that constitutes an electric motor with the stator winding, and is provided on the inner peripheral surface of the rotating drum The drum-type brake device has a braking portion divided into a plurality of parts, and each of the divided brake surfaces is provided with a braking surface and a drum-type braking device arranged to face the braking surface. The brake lining of the braking unit is pressed against almost the entire braking surface of the rotating drum.

  According to the present invention, by pressing the brake lining almost on the entire surface of the rotating drum, the brake stroke amount during braking and during non-braking (when released) can be reduced, and the size of the brake device can be reduced. . Further, the dispersion of the spring force has the effect of reducing the eccentricity of the rotating drum in the left-right direction.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing the overall configuration of an elevator hoisting machine according to Embodiment 1 of the present invention, and FIG. FIG. 3 is a detailed view showing a half of one side of the brake device, FIG. 4 is a partially omitted view showing a non-braking state with the brake device opened, and FIG. 5 is at the time of braking when the brake device is operated. FIG. 6 is a schematic diagram characteristically showing the state during braking with the brake device operated.

  FIG. 1 is an overall configuration diagram of an elevator hoist according to the present invention. A main shaft 2 is erected at the center of a bowl-shaped housing 1 having a bottomed cylindrical shape. The main shaft 2 is integrated with a drive sheave 3. The bowl-shaped rotating drum 4 formed in the above is pivoted. A stator winding 5 is provided on the inner periphery of the housing 1. A field magnet 6 is disposed on the outer peripheral surface of the rotating drum 4 opposite to the driving sheave 3 so as to face the stator winding 5, and the stator winding 5 and the field magnet 6 serve as an electric motor. Is configured. A braking surface 7 is provided on the inner periphery of the rotating drum 4. A drum-type brake device 8 is disposed opposite to the braking surface 7 of the rotating drum 4. The drum type brake device 8 is attached to the support plate 9 side. The other end of the main shaft 2 is fixed to the support plate 9.

  FIG. 2 is an arrangement structure diagram of the drum type brake device 8, in which the main shaft 2 is arranged at the center of the housing 1, and the rotating drum 3 and the drum type brake 8 are arranged on the main shaft 2. In such an arrangement structure, the braking portion is a four-part drum type brake 8, and the side receiving the braking is the rotating drum 4.

  FIG. 3 is a detailed view of the drum brake device 8. Each of the brake devices 8 divided into four parts performs braking and non-braking by electromagnetic force. A fixed iron core 11 is arranged on the main shaft 2. The fixed iron core 11 is provided with an electromagnetic coil 12 and a spring 13. The movable iron core 14 is arranged at a symmetrical position with respect to the fixed iron core 11 via the spring 13. A brake shoe 16 is disposed on the side of the movable iron core 14 opposite to the fixed iron core 11 via a shaft 15. A brake lining 17 is disposed on the surface of the brake shoe 16 that faces the braking surface 7 of the rotating drum 4.

  FIG. 4 shows a non-braking state in which the brake device is opened. The electromagnetic coil 12 is energized by an electric current, and the movable iron core 14 overcomes the urging force of the spring 13 and is attracted to the fixed iron core 11 side. In this non-braking state, there is a gap 20 between the rotating drum 4 and the brake lining 17, and the bending of the rotating drum 4 does not occur.

  FIG. 5 shows a braking state in which the brake device is operated. In this braking state, the electromagnetic coil 12 is not energized, and the urging force of the spring 13 is transmitted via the movable iron core 14, the shaft 15, and the brake shoe 16. The brake lining 17 is transmitted to the brake lining 17 and comes into contact with the rotating drum 4. At this time, the rotating drum 4 is bent. Further, the bending of the brake device 8 depends greatly on the rigidity of the rotating drum 4.

FIG. 6 is a schematic diagram characteristically showing a state during braking when the brake device is operated. First, problems in the conventional drum type brake device will be described based on the schematic diagram of FIG.
When the spring force F31 of the spring 13 is applied to the rotating drum 4 via the brake lining 17 during braking, the rotating drum 4 is deformed as shown in FIG. When this deflection becomes large, the gap 20 formed between the rotating drum 4 and the brake lining 17 becomes large because there is no contact during non-braking. If this gap 20 becomes large, it is necessary to increase the electromagnetic attraction force, which may increase the size of the brake device, which is a factor that hinders downsizing.
Therefore, in order to solve this problem, in the present invention, as shown in FIG. 6, the brake lining 17 is pressed against almost the entire circumferential surface of the rotary drum 4. However, since the brake linings 17 operate normally and should not interfere with each other, a slight gap 41 is provided so as not to affect the bending. The spring force F31 of the spring 13 is divided into four parts in the upper, lower, left and right directions of the rotating drum 4, and the brake lining 17 is pressed against almost the entire surface of the rotating drum 4 (excluding the gap 41), so It is possible to make it as small as. In this way, by pressing the brake lining 17 against almost the entire surface of the rotating drum 4, the brake stroke amount during braking and during non-braking (when released) can be reduced, and the size of the brake device can be reduced. . In addition, the dispersion of the spring force F31 of the spring 13 can be expected to reduce the eccentricity of the rotating drum 4 in the left-right direction.

  In the first embodiment, an example in which the drum type brake 8 has a four-part configuration and the spring force F31 of the spring 13 has four directions has been described. However, the brake lining 17 has substantially the entire circumferential surface (gap) Of course, a structure of two or more divisions with the spring force F31 in two or more directions may be adopted as long as the structure is pressed against (except for 41).

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the whole structure of the elevator hoisting machine in Embodiment 1 of this invention. It is the front view which removed the support plate of the elevator hoisting machine in Embodiment 1 of this invention, and was seen from the brake device side. It is detail drawing which shows the one-side half of a brake device. It is a partially abbreviated figure which shows the state at the time of non-braking which opened the brake device. It is a partially abbreviated figure which shows the state at the time of braking which operated the brake device. It is the schematic diagram which represented the state at the time of braking which operated the brake device characteristically. It is the schematic diagram characteristically showing the state at the time of braking which operated the brake device of the conventional elevator hoist.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Main shaft 3 Drive sheave 4 Rotating drum 5 Stator winding 6 Field magnet 7 Braking surface 8 Brake device 9 Support plate 11 Fixed iron core 12 Electromagnetic coil 13 Spring 14 Movable iron core 15 Shaft 16 Brake shoe 17 Brake lining 20 Crevice F31 Spring force 41 Clearance

Claims (3)

A housing provided with a stator winding on an inner peripheral surface, a main shaft provided in the housing, a rotating drum having a drive sheave disposed in the housing and pivotally supported by the main shaft, and the rotation A field magnet which is disposed on the outer peripheral surface of the drum so as to face the stator winding and forms an electric motor with the stator winding, a braking surface provided on the inner peripheral surface of the rotating drum, and the braking In an elevator hoisting machine comprising a drum-type brake device arranged to face the surface,
The drum-type brake device has a braking portion divided into a plurality of parts, and the brake lining of each of the divided braking portions is pressed against almost the entire braking surface of the rotating drum. Upper machine.   The elevator hoisting machine according to claim 1, wherein a slight gap is provided between the brake linings of each of the braking parts divided into a plurality of parts.   3. The drum type brake device is characterized in that the braking part is equally divided into four parts, and the spring force is uniformly pressed against the entire surface of the rotating drum from the four directions of up, down, left and right. Elevator hoisting machine.

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