JPH0755786B2 - Elevator Traction Machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an elevator traction machine that raises and lowers an elevator car by utilizing friction between a sheave and a hoisting rope.

[Conventional technology]

An traction machine for an elevator is equipped with a drive source motor, a sheave with a worm gear coupled to the motor shaft, and a brake that stops the motor shaft. A hoisting rope is wound around the sheave, and an elevator car is attached to one of the hoisting ropes. On the other hand, a counterweight is suspended, and the elevator car is moved up and down by using the friction between the sheave and the hoisting rope.

In recent years, elevators are required to have stable and smooth speed control and accurate landing. Therefore, the elevator is equipped with a speed detector that detects the motor speed of the traction machine and sends a signal to the control circuit. In addition, the traction machine for elevators has a structure in which a hoisting handle that manually turns the motor shaft of the traction machine can be attached to the motor shaft in order to rescue a person in the elevator car room in the event of an emergency such as when the motor power is cut off. ing.

FIG. 6 is a partial side view of a conventional elevator traction machine disclosed in Japanese Utility Model Publication No. 51-44284, for example.
FIG. 6 is a partial side view showing the state in which the hoisting handle is attached in FIG. 6, and FIG. 8 is a side view of the entire conventional traction machine for elevators cited in the above publication.

6 and 7, (1) is the motor body, (2)
Is a motor shaft, and (40) is a fixed part (50) fixed to the motor body (1) and a rotating part (60) fixed to the motor shaft (2).
And (7) is a hoisting handle attached to the hoisting handle attachment portion provided at the end of the motor shaft that penetrates the speed generator. Hollow rotating part of speed generator (60)
Is fixed to the motor shaft (2) by a key.

[Problems to be Solved by the Invention]

Since the conventional elevator traction machine is configured as described above, the hoisting handle can be attached to the hoisting handle attachment portion without removing anything.

However, the motor shaft diameter of the hoisting handle mounting portion at the motor shaft end is determined by the torque required when the hoisting handle is used, and the minimum allowable diameter for strength design is determined. The diameter of the mounting shaft of the speed generator installed in the middle part cannot be reduced below the above minimum diameter, that is, there is a restriction in using a small speed generator or a speed generator with a common structure. , As shown in Fig. 8, the speed generator is coupled to the motor shaft end (40a).
There is also a known structure in which the speed generator (40) must be removed and the hoisting handle must be installed in the event of an emergency such as when the motor power is cut off, but there was a problem that it took time.

The present invention has been made to solve the above problems, and has a structure in which a small speed detector can be used without being restricted by the diameter of the handle mounting shaft portion, and It is an object to obtain a traction machine for an elevator having a structure that can be easily attached to a motor shaft of a traction machine.

[Means for Solving the Problems]

In order to achieve the above object, in the elevator traction machine of the present invention, a hoisting handle mounting portion is provided on the motor shaft portion intermediate between the motor main body and the motor shaft end portion, and a rotating portion is provided on the motor shaft end portion. Is connected to the motor shaft,
This is provided with a speed detector in which the fixed portion is attached to the motor body by a detachable attachment member.

[Action]

In the elevator traction machine configured as described above, the hoisting handle mounting portion is provided on the motor shaft portion intermediate between the motor body and the motor shaft end portion, and the speed detector is mounted on the motor shaft end portion. The diameter of the mounting shaft of the speed detector can be made smaller than the diameter of the mounting part of the hoisting handle, and a small speed detector can be used. Moreover, since the above-mentioned speed detector is configured such that the rotating portion is connected to the motor shaft end portion, the rotating portion is connected to the motor shaft, and the fixed portion is attached to the motor body by the detachable mounting member, the speed detector is not removed. By removing the above-mentioned mounting member, the hoisting handle can be mounted on the hoisting handle mounting portion.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Figure 1 is an overall side view of an elevator traction machine,
FIG. 2 is a partial side view of the traction machine, FIG. 3 is a front view of FIG. 2, and FIG. 4 is a partial side view showing a state in which a hoisting handle is attached in FIG. The drawings are views for explaining the structure of the hoisting handle and the hoisting handle mounting portion.

1 to 5, (1) is a motor body of a traction machine for elevators, (2) is a motor shaft, and a hoisting handle mounting portion (3) is a part of the motor shaft (2). It is processed into a flat surface, and has a hole (3a) in the center of the flat surface for receiving the stopper (7a) for preventing the hoisting handle from falling off. (4) is an encoder used as a speed detector, which is formed of an outer fixed part (5) and an inner rotating part (6), and the fixed part (5) is attached to the motor body with a leaf spring (5a). It is attached with a screw (5b), the rotating part (6) is connected to the motor shaft, and the axial direction is stopped with a stop nut (6a). The mounting shaft portion of the rotating portion (6) has a smaller diameter than the shaft portion of the hoisting handle mounting portion (3). Reference numeral (7) is a hoisting handle, which has a stopper (7a) for preventing the handle from falling off when the hoisting handle is mounted on the hoisting handle mounting portion (3). The stopper (7a) is normally in the position shown in FIG. 5 by a spring (not shown), and when a force is applied in the direction of the arrow, the stopper (7a) moves in the direction of the arrow and winds the handle as shown in FIG. When mounted on the handle mounting part, the stopper (7a) is a mechanism that fits into the drill hole (3a) of the handle mounting part (3).

In the above embodiment, the encoder used as the speed detector converts the analog amount of the rotation angle of the motor shaft into a digital amount. However, the speed detector may be a speed generator, which is similar to the above. Produce an effect.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

In the elevator traction machine of the present invention,
Since the hoisting handle mounting part is provided on the motor shaft part midway between the motor body and the motor shaft end part, the degree of freedom in the structural design of the encoder, which is the rotation detector mounted on the motor shaft end part, increases, that is, the handlebar. Since the diameter of the mounting shaft of the encoder can be made smaller than the diameter of the traction machine motor shaft without being restricted by the diameter of the mounting shaft, the encoder can be downsized or the structure of the shaft of the encoder can be standardized. A cheaper one can be adopted.

In addition, since the rotating part of the encoder, which is the rotation detector, is connected to the motor shaft and the fixed part is attached to the motor body with the leaf spring and the mounting screw, the encoder should be removed when the motor power is cut off. It is possible to easily attach the hoisting handle to the hoisting handle attachment portion and manually turn the motor shaft by simply removing the mounting screw of the leaf spring without removing it.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 5 show an embodiment of the present invention. FIG. 1 is a side view of an entire traction machine for an elevator.
2 is a partial side view of an elevator traction machine, FIG. 3 is a front view of FIG. 2, and FIG. 4 is a partial side view showing a state in which a hoisting handle is attached, FIG. 5: is a figure explaining the structure of a hoisting handle and a hoisting handle attachment part. FIG. 6 is a partial side view of a conventional elevator traction machine, FIG. 7 is a partial side view showing a state in which a hoisting handle is attached in FIG. 6, and FIG. 8 is a conventional elevator traction machine. It is the whole traction machine side view. (1) is the traction machine motor body for elevators,
(2) is the motor shaft, (3) is the hoisting handle mounting part, (3
a) a drill hole, (4) an encoder used as a speed detector, (5) a fixed part of the encoder, (5a) a leaf spring,
(5b) is the mounting screw, (6) is the rotary part of the encoder, (6
a) is a lock nut, (6b) is a bearing, (7) is a handle, (7a) is a handle dropout stopper, (10) is a sheave, (11) is a worm gear shaft, and (12) is a brake. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A hoisting handle mounting portion is provided on a motor shaft portion intermediate between the motor body and the motor shaft end portion, and a rotating portion is connected to the motor shaft at the motor shaft end portion, and a fixed portion is provided on the motor body. An traction machine for elevators equipped with a speed detector that is attached to a removable mounting member.