JPS622910Y2 - - Google Patents

Description

[Detailed description of the invention] This invention holds the outer periphery of the stator with a bowl-shaped bracket in which a housing for housing the bearing is formed on the inner axial direction, and rotates on the outer periphery of the housing and on the inner periphery of the stator. The present invention relates to a cantilever bearing type electric motor in which a lubricant for the bearing is sealed in an oil cap larger than the diameter of the constricted portion of the bracket.

An embodiment of the present invention will be described based on the drawings. Reference numeral 1 is a drawn product made of a metal plate such as a steel plate, and includes a pre-drawn part 2 that is recessed in the inner axial direction, and a housing 3 that is further deep drawn on the bottom surface of the drawn part 2 and protrudes in the inner axial direction.
4 is a motor cover, 5 is a stator whose outer periphery is press-fitted into the side walls of the bracket 1 and the motor cover 4, and 6 is a cylindrical bearing that is press-fitted into the housing 3. A plurality of arch-shaped grooves 7 are provided on the outer periphery, and one end thereof protrudes in the axial direction of the outer periphery from the bottom surface of the front-stage constricted portion 2 of the bracket 1. 8 is a shaft rotatably supported by the bearing 6; 9 is a rotor fixed to the shaft 8 and disposed on the outer periphery of the housing 3 and on the inner periphery of the stator 5; 10 is a small diameter portion 11, a large diameter portion The small diameter part 11 is press-fitted into the front constricted part 2 of the housing 3 of the bracket 1, the large diameter part 12 is arranged to protrude in the outer axial direction, and the stepped part 13 is formed into a stepped part 12. The auxiliary member 14 that comes into contact with the bracket 1 is a bottomed cylindrical oil cap that is press-fitted onto the outer periphery of the large diameter portion 12 of the auxiliary member 10, and the flange at the opening edge is in contact with the bracket 1. Reference numerals 15, 16, and 17 are bearing lubricants such as a wick-like lubricant made by mixing oil-impregnated felt or cellulose fiber with lubricating oil. are in contact with each other and are sealed in a state where they are pressed in the inner axial direction by the oil cap 14,
Since one end of the bearing 6 protrudes in the outer axial direction from the pre-drawn portion 2 of the bracket 1, the bearing lubricant 17
The contact portion with the bearing 6 (the central portion of the flat ring-shaped bearing lubricant is curved in the outer axial direction so as to be pressed by the thrust washer 18).

Further, the shaft 8 is stepped at the outer axial tip of the contact portion 19 of the rotor 9 with the bearing 6, and the contact portion of the stepped portion 20 of the shaft 8 with the shaft 8 of the rotor 9 is stepped. A metal washer 22 for preventing the rotor from coming off is interposed between the tip of the rotor 21 in the outer axial direction.
In addition, 23 is a rubber washer for oil cutting, 24 is a thrust receiver washer, and 25 is an oil receiver felt.

In the electric motor according to the present invention having the above structure, one end of the bearing 8 protrudes outward from the front throttle part 2 of the bracket 1 in the axial direction, so that the oil cap 14
The degree of contact between the bearing lubricants 15, 16, and 17, which are housed inside and pressed in the inner axial direction, is increased, and in particular, the contact portion of the lubricant 17 with the bearing 6 is pressed by the thrust washer 18. Since the shape is curved in the outer axial direction, the amount of lubricating oil supplied to the contact area between the bearing 6 and the shaft 8 is increased, and the increased amount of lubricating oil allows the motor to be rotated both horizontally and vertically. However, any arrangement is possible.

In addition, a metal washer 22 for preventing rotor removal is interposed between one end of the outer axial direction of the contact portion of the rotor 9 with the shaft 8 and the stepped portion of the shaft 8, thereby preventing the rotor from being removed. The stepped part of the shaft 8 for the purpose of
8 will be manufactured at a lower cost.

[Brief explanation of the drawing]

The figure is a sectional view of essential parts showing an embodiment of the electric motor of the present invention. 1...Bracket, 2...Pre-stage aperture section, 6...
Bearing, 8... Shaft, 14... Oil cap, 17
...Lubricant, 20...Stepped part, 21...Contact part,
22...Metal washer to prevent rotor removal.

Claims (1)

[Scope of utility model registration request] A shaft having a bowl-shaped bracket with a cylindrical housing formed in the inner axial direction, a stator whose outer periphery is held by the bracket, a bearing built into the housing, and a washer supported by the bearing to prevent it from coming off. and a rotor fixed to a shaft and disposed between the housing and the stator, and an oil cap having a diameter larger than the front constriction part of the housing and enclosing a lubricant for the bearing. , one end of the bearing protrudes outward in the axial direction from the bottom surface of the front throttle part of the housing, and in the gap between the front throttle part and the oil cap, a disk-shaped bearing lubricant and a disc-shaped bearing lubricant are arranged in order from the oil cap side. a ring-shaped bearing lubricant having a hole for accommodating one end thereof and having one side in contact with the disk-shaped bearing lubricant; and a flat ring-shaped bearing lubricant whose center portion is held between one end of the bearing and the washer and whose center portion is curved in the outer axial direction. electric motor.