JPH0533656U - Bearing structure of electric motor - Google Patents

Abstract

(57) [Abstract] [Purpose] In a bearing structure of an electric motor composed of an oil-impregnated member and a bearing made of a sintered alloy, when the motor is used vertically, oil from the oil-impregnated member and the bearing leaks out of the motor. To obtain a bearing structure for an electric motor that is effectively used inside. [Structure] Bearing support portion 1 provided in motor case 13
5, the bearing 2 in which the rotary shaft 26 is inserted into the rotary shaft insertion hole 21a
Wear 1. A collar 30 in which a stop ring 29 facing the bearing 21 is mounted on the rotary shaft 26, and a recess 33 is provided on the bearing 21 side between the stop ring 29 and the bearing 21.
Put on. Then, the oil-impregnated member 22 is arranged around the bearing 21 and the collar 30. [Effect] When the oil transmitted from the oil-impregnated member to the bearing flows out from the end of the bearing to the outside, it flows into the recess provided in the collar,
By returning to the oil-impregnated member from this recess, it is absorbed by the oil-impregnated member and can be prevented from flowing out, oil is not run out, and the life of the electric motor can be extended.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a bearing structure for an electric motor.

[0002]

[Prior Art]

 Conventionally, as a bearing structure of this type of electric motor, a bearing support portion 3 is integrally formed on an outer casing 2 of the electric motor 1 shown in FIG. After the oil retaining member 5 is brought into contact with the surroundings and the bearing portion 8 is formed by the metal pressing spring 6 and the metal cover 7, the rotating shaft 11 in which the collar 9 and the washer 10 are inserted passes the washer 10 into the bearing 4 and It is known that the bearing 4 is supported so as to abut (for example, see Japanese Utility Model Laid-Open No. 60-174453).

[0003]

[Problems to be solved by the device]

 In the conventional bearing structure of the electric motor as described above, when the electric motor 1 is used in a vertical type, for example, the pressure from the thrust force is applied to the rotating shaft 11, that is, the pressure is also transmitted to the bearing 4 through the washer 10 and the oil-impregnated member 5 is used. Also, there is a problem that oil from the bearing 4 flows into the surface of the rotating shaft 11 due to pressure and flows out of the outer casing 2 due to centrifugal force.

The present invention has been made to solve the above problems, and when an electric motor is used in a vertical type, the oil from the oil-impregnated member and the bearing does not leak to the outside of the outer casing, and the oil is kept inside the outer casing. The purpose is to obtain a bearing structure for an electric motor that can be returned and collected.

[0005]

[Means for Solving the Problems]

 A bearing structure of an electric motor according to the present invention includes a motor case made of a metal plate, a bearing support portion integrally formed with a shaft insertion hole in the motor case, and an inner wall of the bearing support portion to rotate and rotate. A bearing that supports the shaft and is disposed through the spherical surface of the shaft; an oil-impregnated member that is disposed around the bearing; and a retaining ring that is fitted to the rotary shaft so as to face the bearing. A collar fitted between the stop ring and the bearing is provided, and a recess facing the bearing is formed in the collar.

[0006]

[Action]

 In this invention, a motor case made of sheet metal, a bearing support portion integrally formed with a shaft insertion hole in the motor case, and an inner wall of the bearing support portion are supported to support a rotating shaft. A bearing arranged through the spherical surface, an oil-impregnated member arranged around the circumference of the bearing, a retaining ring fitted to the rotary shaft so as to face the bearing, and a retaining ring. And a collar fitted between the bearing and the bearing, and by forming a recess facing the bearing in the collar, the lubricating oil from the oil-impregnated member to the bearing is rotated by the rotation of the rotating shaft. Is discharged to the outside by the pressure, flows into the recess of the collar, and returns to the oil-impregnated member from the end of the recess.

[0007]

【Example】

 1 to 3a and 3b are views showing an embodiment of the present invention, in which 13 is a motor case of an electric motor 14, which is made of sheet metal and is divided into two parts. Reference numeral 15 is a bearing support portion integrally provided in the motor case, and has a shaft insertion hole 16 in the center. Reference numeral 17 denotes a bearing contact portion which is provided around the shaft insertion hole 16 of the bearing support portion and which is brought into contact with a bearing described later and is integrally formed with a throttle portion 18 having the same shape as the outer shape of the bearing. Has been done. Reference numeral 19 denotes a stator provided inside the motor case 13, around which a coil 20 is wound. Reference numeral 21 denotes a bearing, which is a sintered alloy having a spherical outer shape, and has a rotary shaft insertion hole 21a in the center. Reference numeral 22 denotes an oil-impregnated member, which is made of, for example, felt and is arranged on the outer circumference of the bearing 21. Reference numeral 23 is a holding spring for pressing the oil-impregnated member and the bearing 21, and 24 is a cover for covering the bearing portion 25 including the bearing 21, the oil-impregnated member 22, the holding spring 23, and the like, both ends of which are attached to the motor case 13. ing. Reference numeral 26 denotes a rotary shaft, which has a rotor 27 fitted therein and has a collar described later and a washer 28 which comes into contact with the end portion of the bearing 21, and is supported in the rotary shaft insertion hole 21a of the bearing 21. It Reference numeral 29 is a retaining ring fitted to the rotary shaft 26, and 30 is a collar fitted between the retaining ring and the bearing 21. The collar is in contact with the retaining ring 29 and has a trapezoidal shape with an upper surface 31 having a small diameter. The lower surface 32 is formed with a recess 33 communicating with both ends, and the recess 33 is mounted on the rotary shaft 26 so as to face the bearing 21.

In the bearing structure of the electric motor configured as described above, the assembly is performed by disposing the bearing 21 and the oil-impregnated member 22 in the bearing support portion 15 of the motor case 13 and pressing them with the holding spring 23. A cover bearing portion 25 is formed by the cover 24. Next, the stator 19 is fitted into one of the motor cases 13, and the rotary shaft 26 having the rotor 27, the collar 30 and the washer 28 is inserted into and supported by the bearing 21, and the other side of the motor case 13 is To join. Then, a load (not shown) is attached to the tip of the rotary shaft 26, and the rotary shaft 26 is operated in the vertical direction. In this case, the rotation of the rotary shaft 26 causes the lubricating oil from the oil impregnated member 22 to the bearing 21 to flow into the concave portion 33 provided on the lower surface 32 of the collar 30 at the stage of flowing out of the rotary shaft 26 due to the pressure of the lubricating oil. The oil-retaining member 22 is returned from the end of the oil-retaining member 22 as shown by the arrow in FIG. Then, by being transmitted to the bearing 21 and repeating this operation, the lubricating oil does not flow out of the motor case 13.

[0009]

[Effect of the device]

 As described above, this invention has a motor case made of sheet metal, a bearing support portion integrally formed with a shaft insertion hole in the motor case, and an inner wall of the bearing support portion to abut the rotary shaft. A bearing which is supported and is disposed through the spherical surface, an oil-impregnated member which is disposed around the bearing, a retaining ring which is fitted to the rotary shaft so as to face the bearing, and When the oil transmitted from the oil-impregnated member to the bearing flows out from the bearing end due to the retaining ring and the collar fitted between the bearing and the collar, which has a recess facing the bearing. It flows into the concave part of the collar and flows back to the oil-impregnated member on the outside from the end of the concave part, and is absorbed by the return and prevents outflow to the outside, preventing oil leakage, oil shortage, seizure, etc. and extending the life of the motor. Can be kept.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric motor showing an embodiment of the present invention.

FIG. 2 is a sectional view of a bearing portion showing an embodiment of the present invention.

FIG. 3 shows an embodiment of the present invention, a is a front view of a collar, and b is a sectional view showing the arrow a of this a.

FIG. 4 is a sectional view showing a bearing structure of a conventional electric motor.

[Explanation of symbols]

 13 motor case 15 bearing support 16 shaft insertion hole 21 bearing 22 oil impregnating member 26 rotary shaft 29 stop ring 30 collar 33 recess

Claims (1)

[Scope of utility model registration request] 1. A motor case made of sheet metal, a bearing support portion integrally formed with a shaft insertion hole in the motor case, and an inner wall of the bearing support portion to support a rotary shaft, A bearing arranged via the spherical surface, an oil-impregnated member arranged around the bearing, a retaining ring fitted to the rotary shaft so as to face the bearing, the retaining ring and the bearing. With a collar fitted between
A bearing structure for an electric motor, characterized in that a recess is formed in the collar so as to face the bearing.