JP2001080855A - Hoist of elevator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain generation of noise by connecting a motor and a sheave, and arranging a speed reducer for decelerating the motor side between the motor and a brake. SOLUTION: The sheave 2 and the motor 1 are directly connected. The speed reducer 3 is arranged between a brake 4 and the motor 1. With this constitution, since the sheave 2 and the motor 1 are directly connected, an excess mechanical part can be removed to restrain that generation of vibration noise by mechanical contact. The speed reducer 3 is arranged between the motor 1 and the brake 4, and since torque transmitting time of the brake 4 is stopping time, vibration noise is not generated. When a gear of the speed reducer 3 rotates, a disc freely rotates since the brake 4 is not applied, so that force is not transmitted via the gear of the speed reducer 3 is principle, and braking noise is not generated. Thus, vibration noise is not generated by the speed reducer 3, required torque of the brake 4 can be reduced, and a brake device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoisting machine for an elevator apparatus, and more particularly to a hoisting machine which is compatible with downsizing of a brake suitable for being arranged in a hoistway and low noise of the hoisting machine. Related to the structure.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Sho 60-209486, there has been shown a construction in which a speed reducer is provided between a motor and a sheave and a speed reducer is further added between a motor and a brake. ing.

Further, as disclosed in Japanese Patent Application Laid-Open No. 9-165172, there is disclosed an elevator in which a hoist is arranged in a hoistway and a machine room is eliminated.

[0004]

In the first prior art, since the speed reducer is provided between the sheave and the motor, the torque of the motor can be reduced by the speed reduction ratio, and the motor can be downsized. Loud noise is generated at the meshing portion of the gears of the reduction gear. Therefore, when the hoist of the first conventional example is disposed in the hoistway, the problem that vibration and noise generated by the speed reducer propagates to the car, the hall, and the living room near the hoistway, resulting in large noise. There is.

In the second conventional example, the hoist is located in a place where it does not interfere with the pit or the top of the hoistway. If it is located at the top of the hoistway, it must be extremely robust to prevent the hoist from falling during an earthquake. There are issues such as difficulty in maintenance and inspection. On the other hand, when the hoist is disposed in the pit, the above-mentioned problem is eliminated, but it is necessary to take measures in consideration of the pit flooding.
For this reason, since the motor and the electromagnet brake, which are the main components of the hoist, have energized coils, they need to have a completely waterproof structure so that their insulation is not deteriorated by water.

[0006] However, it is easy to seal the bearing portion of the motor to obtain a waterproof structure, but the electromagnetic brake is required to move a braking member for exerting a braking force by several millimeters, so that it has a wide range. It is necessary to cover the movable part to have a waterproof structure, and there is a problem that the structure is large and complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hoist capable of reducing the size of a brake suitable for providing a waterproof structure without generating the above-mentioned loud noise.

[0008]

The above object can be achieved by directly connecting the motor and the sheave and providing a speed reducer between the motor and the brake for reducing the speed of the motor.

[0009]

FIG. 1 is an external view of a hoist according to the present invention.

A sheave 2 is provided on the output shaft of the motor 1,
A brake device 4 is attached to another shaft of the motor 1 via a speed reducer 3 whose speed on the motor side is reduced. These constitute the hoisting machine 4. Further, the brake device 4 includes a disc 41 and a brake unit 42 for clamping the disc to obtain a braking force.

Since the rotation speed of the disk 41 of the brake device 4 is increased by the speed reducer 3, the braking torque required for the brake unit decreases in accordance with the speed reduction ratio of the speed reducer 3.

A normal brake unit has a structure in which a disc is pressed by a spring force to generate a braking force, and a force that overcomes the spring force is generated by an electromagnet to release the brake.

FIG. 2 is an external view of an elevator apparatus according to an embodiment of the present invention.

The weight 13 is balanced with the car 12 and the rope 1
4 are connected by 2: 1 roping, and both ends of the rope 14 are fixed to the upper part of the hoistway, and the hoisting machine 11 is provided in the pit at the lowermost part of the hoistway. In other words, between the fixed ends of the ropes 14, the lower car pulley 15 and the upper car pulley 1
Through the sheave of the hoisting machine 11 provided in the pit, passes through the top pulley 17 on the counterweight side, passes through the upper pulley 18 of the counterweight 13, and is fixed to the top of the hoistway.

The hoisting machine 11 has a cable 2 from a control panel 19.
0 is wired, thereby controlling the number of revolutions of the hoisting machine 11, stopping the movement of the car 12 to a desired floor, and exhibiting the function as an elevator.

In the present embodiment, the hoisting machine 11 and the control panel 19 are arranged in the hoistway, and there is no need to provide a dedicated machine room at the top of the hoistway. This has the effect of flexibly responding to shadow regulations. However, in order to dispose the hoisting machine in the hoistway in this way, it is necessary to prevent the vibration noise from propagating at a problematic level to the car, the elevator hall, and the living room near the hoistway. Therefore, it is necessary to minimize the vibration noise generated by the hoist itself.

For this reason, as shown in the external view of the hoist of the embodiment of FIG. 1, the sheave and the motor are directly connected to each other, and unnecessary mechanical parts are removed to reduce vibration noise due to mechanical contact. The occurrence is suppressed.

In order to dispose the hoist in the hoistway, it is necessary to make the hoist itself as small as possible. For this purpose, it is effective to reduce the torque of the motor, but it is impossible to use a speed reducer for the output shaft of the motor in terms of vibration noise. As with the motor, reducing the braking force of the brake is also effective because the size of the brake can be reduced. In this case as well, the point of vibration noise is uneasy, but the brake transmits torque when stopping, and no vibration noise is generated even if a speed reducer is provided between the motor and the brake. When the gear of the speed reducer rotates, the disc does not brake and the disk rotates freely, so that in principle no force is transmitted via the gear of the speed reducer, and therefore no vibration noise is generated. In practice, a slight mechanical loss of torque may be applied, but the level of vibration noise is extremely low.

Accordingly, when a speed reducer is provided between the brake and the motor as in the hoist of the present embodiment, the required torque of the brake can be obtained without generating vibration noise in the speed reducer due to the principle of operation of the brake. Therefore, there is an effect that the size of the brake device can be reduced.

As an emergency, in an emergency such as when it becomes impossible to stop due to a failure of the control device, the operating elevator may be forcibly stopped by the brake. In such a case, since the braking force is transmitted to the rotating reduction gear, a large vibration noise will be generated. However, this is a very rare case, and even if vibrations and noises larger than usual occur at this time, it does not pose a problem as long as safety is not impaired. Conversely, the periphery of the speed reducer is manufactured in consideration of the stress at the time of emergency braking.

In the embodiment shown in FIG. 2, since the hoisting machine is arranged in the pit, there is a possibility of flooding. Therefore, even if the operation is not performed during the flooding, it is desired that the operation can be performed as it is without replacement after the water is drained. For this reason, the hoist has a waterproof structure. If the motor has a waterproof structure using a frame having a sealed structure and a bearing using an oil seal or the like, the waterproof structure can be realized relatively easily. However, in the brake device, the brake plate for clamping the disk moves in the axial direction,
Since they are exposed to the outer diameter, they must have a complicated and large-scale structure such as providing a shrinkable sealing material on the outermost periphery in order to make them waterproof. Therefore, when a brake is connected via a speed reducer as in the hoist of the present embodiment,
Since the size of the brake can be reduced and the volume of the waterproof structure can be reduced, the waterproof structure can be easily realized.

[0022]

According to the present invention, the sheave and the motor are directly connected, and unnecessary mechanical parts are removed to suppress the generation of vibration noise due to mechanical contact. When a speed reducer is provided between the brake and the motor, the required torque of the brake can be reduced without generating vibration noise in the speed reducer due to the principle of the operation of the brake, so that the brake device can be downsized.

Further, if the brake is connected via a speed reducer, the size of the brake can be reduced and the volume of the waterproof structure itself can be reduced, so that the waterproof structure can be easily realized so as to cope with pit flooding when the pit is arranged. effective.

[Brief description of the drawings]

FIG. 1 is an external view of a hoist according to an embodiment of the present invention.

FIG. 2 is an external view of the elevator apparatus according to the embodiment of the present invention.

[Explanation of symbols]

1 ... motor, 2 ... sheave, 3 ... reducer, 4 ... brake,
11 ... Hoisting machine.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noboru Arahori 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Inside the Elevator Division, Hitachi, Ltd. F-term in the Mito Works (reference) 3F305 BA03 BA15 BB02 BB19 3F306 BA07 BA09

Claims (3)

[Claims] (1) A gearless motor and a geared brake. In a rope-type elevator in which a counterweight and a car are connected via a rope, the rope is driven by a hoist, and the car is moved up and down. The hoist of the elevator device, wherein the upper machine comprises a motor directly connected to the sheave and a brake device connected to the motor via a speed reducer. 2. A hoisting machine for an elevator apparatus according to claim 1, wherein the hoisting machine is disposed in a hoistway. 3. A hoisting machine for an elevator apparatus according to claim 2, wherein the hoisting machine is arranged in a pit.