JPH08214490A - Bearing device of motor - Google Patents

Abstract

PURPOSE: To provide a bearing device of a motor which may be returned for collection into a bracket without release of oil to outside from an oil- impregnated member and bearing when a motor is used in the vertical situation. CONSTITUTION: A bearing 4 inserting a rotating shaft 11 into the rotating shaft inserting hole 15 is loaded to a bearing supporting part 3 provided in a bracket 2. An oil-through washer 17 provided opposed to a bearing 4 is loaded to this rotating shaft 11 and this oil-thrower washer 17 is loaded between the bearing 4 and a projection 13 circumferentially provided at the end face of a through hole 12 inserting the rotating shaft 11 at the center of the bracket and the external diameter of this oil-thrower washer 17 is set larger than the internal diameter of such projection. The oil-impregnated member 5 is provided at the circumference of the bearing 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for an electric motor, and more particularly to a bearing device for an electric motor in which the bearing portion has a good oil retention.

[0002]

2. Description of the Related Art As a conventional bearing device for a motor of this type, there is a bearing device for a motor shown in FIG.
FIG. 2 is a sectional view showing a conventional bearing device for an electric motor. Conventionally, as shown in the figure, a bearing support portion 3 is integrally formed on a bracket 2 of an electric motor 1, a bearing 4 is disposed on the bearing support portion 3, and an oil impregnating member 5 is provided around the bearing 4 to press it. Spring 6
After forming the bearing portion 8 with the oil cap 7, the thrust shaft 9 and the washer 10 are inserted into the rotating shaft 11.
There is known a bearing device for an electric motor supported by the bearing 4 so that the washer 10 is brought into contact with the bearing 4.

[0003]

In the conventional bearing device for an electric motor as described above, for example, when the electric motor 1 is used in a vertical type, the pressure from the thrust force is applied to the rotary shaft 11, that is, the bearing 4. Oil was also transmitted through the washer 10, oil from the oil-containing member 5 and the bearing 4 flowed into the surface of the rotating shaft 11 due to pressure, and flowed out of the bracket 2 due to centrifugal force.

Therefore, according to the present invention, even when the electric motor is used vertically, the bearing device of the electric motor can be returned and collected inside the bracket without oil from the oil-impregnated member and the bearing flowing out of the bracket. Is the challenge.

[0005]

A bearing device for an electric motor according to the present invention comprises a bracket made of aluminum die casting,
A bearing support portion integrally formed with a through hole at the center of the bracket and a projection is formed on the end surface of the through hole inside the bearing support portion, and the rotary shaft is opposed to the projection. While supporting, a bearing arranged via a spherical surface,
An oil having an outer diameter larger than the inner diameter of the protrusion fixed to the rotating shaft between the oil-impregnated member arranged around the bearing and the protrusion provided on the end face of the through hole facing the bearing. It is provided with a cutting washer.

[0006]

[Work] In a bearing device for an electric motor according to the present invention, the rotary shaft is supported in opposition to a protrusion provided on the end surface of the through hole inside the bearing support portion, and the circumference of the bearing is disposed through a spherical surface. The oil-impregnated member is installed on the shaft, and the oil-draining washer fixed to the rotating shaft is provided so as to face the bearing. And then flows into the projection of the bracket through the oil washer, and the bearing supporting portion is provided with a plurality of grooves, and the grooves are returned to the oil-impregnated member and collected in the bearing.

[0007]

EXAMPLES Examples of the present invention will be described below.
FIG. 1 is a sectional view showing a bearing device for an electric motor according to an embodiment of the present invention. In the figure, 2 is a bracket of the electric motor 1, which is made of aluminum die casting and is divided into two parts. Reference numeral 3 denotes a bearing support portion that is integrally provided on the bracket 2. The bearing support portion 3 has a through hole 12 in the center thereof, and the bearing support portion 3 is circumferentially provided outside the through hole 12. 13 is a through hole 12 of the bracket 2
Is a protrusion provided around the end surface of the bearing and is provided toward the bearing 4 described later. Reference numeral 14 is a stator provided in the bracket 2. Reference numeral 4 denotes a bearing, which is a sintered alloy having a spherical outer shape, and has a rotary shaft insertion hole 15 at the center. An oil-impregnated member 5 is made of, for example, felt and is arranged on the outer circumference of the bearing 4. 6 is a holding spring for pressing the oil-impregnated member 5 and the bearing 4, 7 is an oil cap for covering a bearing portion 8 including the bearing 4, the oil-impregnated member 5, the holding spring 6 and the like,
Both ends are attached to the bracket 2. Reference numeral 11 is a rotary shaft, to which a rotor 16 is fixed, and which is described below in a thrust color.
9 and a washer 10 that comes into contact with the end of the bearing 4 and is supported by the rotary shaft insertion hole 15 of the bearing 4. 17
Is a disc-shaped oil washer mounted on the rotary shaft 11, and the oil washer 17 is arranged between the protrusion 13 and the bearing 4 which are provided around the through hole at the center of the bracket. The outer diameter of the oil draining washer 17 is smaller than the inner diameter of the bearing supporting portion 3 and larger than the inner diameter of the protrusion 13 provided around the through hole.

In the bearing device of the electric motor constructed as described above, the bearing 4 and the oil-impregnated member 5 are arranged on the bearing support portion 3 of the bracket 2, and the pressing spring 6 holds them.
After pressing with, the bearing portion 8 is formed by covering with the oil cap 7. Next, the stator 14 is attached to one of the brackets 2.
Is inserted, and the rotating shaft 11 on which the rotor 16, the thrust collar 9 and the washer 10 are mounted is inserted into and supported by the bearing 4, and the other side of the bracket 2 is joined to the other side of the stator.
Then, a load (not shown) is attached to the tip of the rotary shaft 11,
It is operated in a vertical type with the rotating shaft 11 as the vertical direction. In this case, when the rotating shaft 11 rotates, the lubricating oil from the oil impregnating member 5 to the bearing 4 flows outward from the rotating shaft 11 due to the pressure of the rotating shaft 11 to the end surface of the through hole of the bracket 2 via the oil washer 17. A plurality of grooves 18 are provided so as to flow into the circumferentially provided protrusions 13 and cut the bearing support portion 3 circumferentially provided outside the through hole 12, and then returned to the oil-impregnated member 5 from the grooves 18. And then collected in the bearing 4. By repeating this operation, the lubricating oil will not flow out of the bracket 2.

As described above, the bearing device for the electric motor of this embodiment includes the bracket 2 made of aluminum die casting, the bearing support portion 3 integrally formed with the bracket 2 having the through hole 12, and the through hole. Protrusions 13 provided around the end face of 12
The rotary shaft 11 is provided so as to face the bearing 4, the bearing 4 is provided through a spherical surface, the oil-impregnated member 5 is provided around the bearing 4, and the rotary shaft 11 is provided so as to face the bearing 4. And an oil washer 17 attached to the. The oil washer 17 is mounted between the bearing 4 and the protrusion 13 provided around the through hole of the bracket, and faces the bearing 4.

Accordingly, the rotation of the rotary shaft 11 causes the lubricating oil from the oil-containing member 5 to the bearing 4 to flow outward from the rotary shaft 11 under the pressure thereof, and is provided around the end face of the through hole of the bracket through the oil washer. Flown into the protrusion 13 and returned to the oil-impregnated member 5 via a plurality of grooves 18 provided around the bearing support 3. Therefore, it is possible to prevent the lubricating oil from flowing out from the bearing portion 8 and prevent oil leakage, oil shortage, seizure, etc.
As a result, the life of the motor is extended. In the embodiment, the rotary shaft 11 is arranged vertically, but the rotary shaft 1
It goes without saying that the same function can be obtained even if 1 is arranged horizontally.

[0011]

As described above, in the bearing device for an electric motor according to the invention of claim 1, the protrusion provided on the end surface of the through hole of the bracket, the bearing support portion, the bearing, the oil impregnating member, and the oil drain washer are provided. And a rotation shaft is provided facing the bearing support portion, and an oil-impregnated member is arranged around the bearing arranged via a spherical surface, and the oil draining washer is provided on the rotation shaft facing the bearing. Since it is mounted between the bearing and the protrusion that is provided around the end surface of the through hole of the bracket, the rotation of the rotary shaft causes the lubricating oil from the oil-impregnated member to the bearing to flow outward from the rotary shaft under its pressure, and the oil drain It flows through the washer into the projection located on the end surface of the through hole of the bracket, and is returned to the oil-impregnated member from the groove provided in the bearing support part. Can be prevented and the life of the motor can be It is possible.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Bracket 3 Bearing support part 4 Bearing 5 Oil impregnated member 6 Holding spring 7 Oil cap 8 Bearing part 9 Thrust color 10 Washer 11 Rotating shaft 12 Through hole 13 Protrusion 14 Stator 15 Rotating shaft insertion hole 16 Rotor 17 Oil cut washer 18 grooves

Claims (1)

[Claims] 1. An electric motor in which a holding spring is provided on an inner surface of a bracket, and the bearing is held by a bearing supporting portion provided at the center of the bracket by the holding spring, and the holding spring is held by an oil cap. At the same time, an oil-impregnated member is provided between the holding spring and the bracket, a plurality of grooves are provided in the bearing support portion, and a through hole for inserting the rotary shaft is provided in the center portion of the bracket, and an end surface of the through hole is provided. A protrusion facing the bearing is provided so as to face the rotating shaft, and an oil drainer having an outer diameter larger than the inner diameter of the protrusion is provided on the rotating shaft so as to be located between the bearing and the protrusion provided on the end surface of the bracket through hole. A bearing device for an electric motor, comprising a washer.