JP2543792Y2 - Electric motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor suitable for use in a humid place.

[0002]

2. Description of the Related Art In a motor used in a humid place, a disc-shaped end cover having no windows is arranged at both ends in the axial direction of a cylindrical motor cover accommodating the motor body. In many cases, the motor body is hermetically sealed or nearly hermetically sealed by the motor cover and both end covers. In this type of motor, the end cover disposed on the front shaft side in the axial direction is often formed integrally with the motor cover, but the end cover disposed on the rear shaft side in the axial direction is the same as the motor cover. Formed separately. The end cover is fitted to the end of the motor cover, and the end of the motor cover is swaged or seamed on the outer peripheral side of the end cover, and the end cover is fixed to the motor cover.

FIGS. 3 and 4 show a structure in which an end cover is fixed to a motor cover in a conventional motor of this type, respectively. In the structure shown in FIG.
After fitting the outer peripheral portion of the end cover 3 to the end portion of the motor cover 1, the end cover 3 is crimped to the outer peripheral side of the end cover 3 at a plurality of locations 11 to 14 at the end portion of the motor cover 1. It is fixed to.

In the structure shown in FIG. 4, after the outer periphery of the end cover 3 is fitted to the end of the motor cover 1, the end of the motor cover 1 is moved over the entire periphery toward the outer periphery of the end cover 3. The end cover 3 is fixed to the motor cover 1 by seaming. 1b of FIG. 4 has shown the seaming process part.

[0005]

In the above-mentioned conventional electric motor, the end portion of the motor cover is caulked at a plurality of locations on the outer peripheral portion of the end cover to fix the end cover to the motor cover. In most other places, water and the like may enter the inside of the motor through a small gap between the fitting portion between the end cover and the motor cover. Further, in a motor in which the end of the motor cover is seamed over the entire outer periphery of the end cover to fix the end cover to the motor cover, the motor body is completely sealed by the motor cover and the end cover. Therefore, there is no possibility that moisture or the like will enter the inside of the motor from the outside. However, when the temperature of the air in the motor drops and dew condensation occurs, the water drops cannot flow out of the motor. For this reason, the conventional motor has a problem that the humidity in the motor increases and insulation is reduced.
SUMMARY OF THE INVENTION An object of the present invention is to provide an electric motor in which moisture or the like hardly permeates into the inside of the electric motor, and in which even if water droplets accumulate in the electric motor due to condensation or the like, the electric water can flow out to the outside.

[0006]

According to the present invention, a cylindrical motor cover accommodating a motor body is provided with disk-shaped end covers at both ends in the axial direction, and at least one end of the motor cover has one end. The present invention relates to a motor in which the outer peripheral portion of the cover is seamed and the one end cover is fixed to the motor cover.

In the present invention, a part of the end of the motor cover on which the seaming is performed is left unseamed at a part thereof, and the motor cover is subjected to the seaming processing. A drain hole that connects the inside and outside of the motor to each other is formed between the uncovered portion and the end cover.

[0008]

As described above, when a drain hole is formed in this portion of the motor cover on the side where the seaming process is performed, leaving a portion where the seaming process is not performed, the drain hole is formed. Is positioned on the lower side and the axis is oriented in the horizontal direction, even if water drops are poured into the motor from above or obliquely from above, there is little possibility that the water drops will enter the inside of the motor. Also, even if water droplets enter the motor or cause dew condensation in the motor, the water droplets or dew can flow out through the drain hole to the outside, so that it is possible to prevent water from remaining in the motor. it can.

[0009]

1 and 2 show an embodiment of the present invention. In these drawings, reference numeral 1 denotes a cylindrical motor cover,
Reference numeral 2 denotes an end cover disposed on the front shaft side in the axial direction of the motor cover 1. In this embodiment, the motor cover 1 and the end cover 2 are integrally formed in a cup shape. Reference numeral 3 denotes a disk-shaped end cover disposed on the rear shaft side of the motor cover 1 in the axial direction. Motor cover 1 and both end covers 2
And 3 form a motor casing.
Inside the casing, a stator (not shown) fixed to the motor cover 1 and bearings 4 respectively fixed to the front shaft-side end cover 2 and the rear shaft-side end cover 3 (the front shaft-side bearing is not shown). (Not shown) accommodates a motor body composed of a rotor 5 whose rotating shaft is supported.

The motor cover 1 and the end cover 2 are integrally formed by pressing an iron plate by pressing, and a bulging portion 2a into which a bearing is fitted is provided at the center of the end cover 2 inside. The output shaft 6 of the electric motor is led out through a through hole provided in the bulging portion.

The end cover 3 on the rear shaft side is similarly formed into a disk shape by pressing an iron plate, and a bulging portion 3a in which a bearing 4 is fitted is provided at the center portion thereof. . At the rear shaft end of the cylindrical motor cover 1,
A thin portion 1a having a larger inner diameter than the other portions and a reduced thickness is formed, and the thin portion 1a is seamed on the outer peripheral side of the end cover 3 to form
Are fixed to the end of the motor cover 1. In the figure, 1b indicates a seaming portion. A portion 1c of the thin portion 1a of the motor cover 1 which is not subjected to the seaming process is left in a part of the circumferential direction of the thin portion 1a. A drain hole 7 for communicating between the inside and outside of the electric motor is formed by a small gap formed in the fitting portion.

The electric motor having the above configuration is mounted on a device or the like in a state where the axis is horizontal and the drain hole 7 is located at the lowermost side. In this state, since the seaming portion occupying most of the joint portion between the motor cover 1 and the end cover 3 is located on the upper side, even if water drops may be poured into the motor from the outside, the inside of the motor may remain. There is little danger of infiltration of water, and even if water droplets are generated in the electric motor due to dew condensation or the like, the water droplets can flow out through the drain hole 7 to the outside.

In the above embodiment, the end cover 2 located on the front axis side of the motor cover 1 in the axial direction is the motor cover 1.
The end cover 2 is formed separately from the motor cover 1, and the outer periphery of the end cover 2 is seamed on the end of the front shaft portion of the motor cover 1 to form the end cover 2. You may make it fix to a motor cover. In this case, an unseamed portion is left at a part of the rear shaft-side end corresponding to the unseamed portion 1c of the rear shaft-side end of the motor cover 1, and this seaming is performed. If a drain hole similar to the drain hole 7 on the rear shaft side is formed in a portion where processing is not performed, water droplets generated in the electric motor can flow out to the outside through the drain hole.

In the above embodiment, the drain hole is formed by the small gap at the fitting portion between the portion of the motor cover left unseamed and the outer periphery of the end cover. A small notch groove may be provided on the outer peripheral portion of the end cover located at a portion left without being provided, and the notch groove may form a drain hole for communicating the inside and outside of the electric motor.

[0015]

As described above, according to the present invention, at least one end in the axial direction is seamed on the outer peripheral portion of the end cover, and a portion of the one end of the motor cover which is not subjected to seaming is left. Since the drain hole is formed between the portion of the motor cover where the seaming is not performed and the end cover, the possibility that water droplets enter the inside of the electric motor can be reduced. If water droplets are formed in the motor due to condensation or the like, the water droplets can flow out through the drain hole to the outside, preventing the water droplets from staying in the motor and reducing the insulation of the motor body due to moisture. There is an advantage that the possibility of occurrence can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view partially showing an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1 as viewed from a Z direction.

FIG. 3 is a front view showing an example of a conventional electric motor.

FIG. 4 is a front view showing a different example of the conventional electric motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor cover, 1a ... Thin part, 1b ... Seaming part, 1c ... Part where seaming is not performed,
2, 3 ... end cover, 4 ... bearing, 5 ... rotor (motor body), 6 ... output shaft, 7 ... drain hole.

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk-shaped end cover is disposed at each axial end of a cylindrical motor cover accommodating a motor body, and at least one end of the motor cover is seamed on an outer peripheral portion of one end cover. In the electric motor in which the one end cover is fixed to the motor cover, a part that is not subjected to seaming is left at a part of the end of the motor cover on which the seaming is performed, An electric motor characterized in that a drain hole for communicating the inside and outside of the electric motor is formed between a portion of the motor cover that is not subjected to seaming and an end cover.