JPS6227013Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a drawn metal plate, and the outer periphery of the stator is held by a bowl-shaped bracket in which a housing for housing the bearing is formed in the inner axial direction, and the outer periphery of the housing is , and relates to a cantilever bearing type electric motor in which a rotor is arranged on the inner periphery of a stator.

Conventional cantilever bearing type electric motors have brackets made of cast aluminum or iron, which requires a large number of cutting operations to obtain axial centering, resulting in high material costs.
This had the disadvantage that the electric motor was large. Therefore, in recent years, brackets made of drawn metal plates have come into use, but the oil cap that seals in the lubricant for the bearing is press-fitted into the drawn part of the bracket housing at the end of motor assembly. As a result, they were small and could not hold sufficient oil, making them unsuitable for electric motors that needed to be used for many years. Also, if you are trying to install an oil cap that is larger than the diameter of the throttle part of the bracket housing, it will be difficult to install claws on the oil cap or use screws or rivets to attach it to the bracket because the stator will get in the way. In this case, sufficient strength could not be obtained and there was a risk of oil leakage.

The present invention was developed in view of the above facts, and in a cantilever bearing type electric motor using a bracket made of a drawn metal plate, the diameter of the bracket is larger than the drawn part of the housing for incorporating the bearing. The present invention is characterized in that an oil cap is attached to a bracket using an auxiliary member that is fixed in advance to the bracket, and the purpose of the present invention is to provide an electric motor that can secure a sufficient amount of oil and can withstand long-term use.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Fig. 1, 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 deep drawn part 2 that is further deep drawn inside the drawn part 2 and protrudes in the inner axial direction. A bowl-shaped bracket 4 is integrally formed with a housing 3, and 4 is a bowl-shaped motor cover whose opening edge is flanged to the bracket 1 and fixed to the bracket 1 by its own locking claws 5, 5. It is made of a drawn plate and has a rotor insertion hole 6 on the bottom surface. 7
Reference numeral 8 indicates a stator whose outer periphery is press-fitted into the side wall of the bracket 1 and the motor cover 4. Reference numeral 8 indicates a cylindrical bearing which is press-fitted into the housing 3, and a plurality of arch-shaped grooves 9 are provided on the outer periphery. 10 is a shaft rotatably supported by a bearing 8; 11 is a rotor fixed to the shaft 10 and disposed on the outer periphery of the housing 3 and on the inner periphery of the stator 7; 12 is a rotor as shown in FIG. It consists of a stepped cylindrical member having a small diameter part 13 and a large diameter part 14, the small diameter part 13 is press-fitted into the front constriction part 2 of the housing 3 of the bracket 1, and the large diameter part 14 is disposed so as to protrude outward in the axial direction. The stepped portion 15 is an auxiliary member that comes into contact with the bracket 1, and 16 is the auxiliary member 1.
The oil cap is a cylindrical oil cap with a bottom that is press-fitted onto the outer periphery of the large diameter portion 14 of the bracket 1, and the flange at the opening edge is in contact with the bracket 1. 17,18
is a bearing lubricant such as a wick-like lubricant made by mixing oil-impregnated felt or cellulose fiber with lubricating oil, and the lubricant 17 is placed in the oil cap 16 with a part of the lubricant 17 in contact with the bearing 8. Enclosed. A sealing member or an adhesive is sealed in the gap 19 between the bracket 1, the auxiliary member 12, and the oil cap 16.

Therefore, according to the electric motor of the present invention, the bracket 1
A drawn metal plate is used to make the product small and lightweight.
In addition, the bracket 1 and the housing 3 are integrally formed, and the axial center of the rotor 11 can be aligned with the magnetic center of the stator 7 with high accuracy, so machining such as cutting is not required. Manufacturing becomes easier. Furthermore, a large oil cap 1 is constructed using an auxiliary member 12 in which the small diameter part 13 is press-fitted into the front constriction part 2 of the housing 3 of the bracket 1, and the large diameter part 14 is arranged so as to protrude outward in the axial direction.
Since the bearing 6 can be installed, a sufficient amount of oil can be secured, and there is no risk of the bearing 8 seizing due to lack of oil even after many years of use, making it suitable for use in refrigerators and air conditioners. Suitable for electric motors that require long life, such as fan motors.
In addition, since the oil cap 16 is firmly externally attached to the bracket 1 via the auxiliary member 12, the stator 7 inside the bracket 1 does not get in the way when it is attached at the end of motor assembly, and it can be easily attached. , there is no risk of oil leakage.

As mentioned above, the present invention uses a bracket made of a drawn metal plate, and uses an auxiliary member fixed to the bracket in advance to attach an oil cap that has a larger diameter than the housing throttle part of the bracket. It is small, lightweight, and inexpensive, and is highly reliable as it can achieve axial centerness without machining such as cutting, and has a sufficient amount of oil retention, so it can withstand many years of use. It is useful.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electric motor showing an embodiment of the present invention, Fig. 2 a and b show auxiliary members used in Fig. 1, Fig. a is a front view, and Fig. b is a longitudinal sectional view. . DESCRIPTION OF SYMBOLS 1... Bracket, 2... Throttle part, 3... Housing, 7... Stator, 8... Bearing, 10... Bearing, 11... Rotor, 12... Auxiliary member, 16...
...Oil cap.

Claims (1)

[Scope of utility model registration request] A bowl-shaped bracket made of a drawn metal plate 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 supported by the bearing. a rotor fixed to the shaft and disposed between the housing and the stator, a small diameter part press-fitted into the housing, and a large diameter part connected to the small diameter part via a step. An electric motor comprising: a cylindrical auxiliary member; and a cylindrical oil cap press-fitted into the housing and enclosing a lubricant for the bearing.