JPH0723021Y2 - Felt member for oil-impregnated bearing of electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a felt member for a sintered oil-impregnated bearing of an electric motor.

[Problems to be Solved by Prior Art and Invention] Generally, various means are provided for bearings in electric motors or the like, but the bearings themselves are made of oil-impregnated members such as sintered alloy members. There are some that are formed so that lubricating oil is unnecessary or as little as possible. Then, in this case, as replenishment of the lubricating oil to the oil-impregnated bearing portion, for example, as shown in FIG. 4, a ring-shaped felt member d is incorporated in the surrounding strip on the outer peripheral surface of the oil-impregnated bearing portion c, and the felt member d is impregnated with oil. It is known that at least the oil-impregnated bearing portion c is supplied with oil.

By the way, between the outer peripheral surface of the felt member d and the inner bottom wall a of the bearing yoke portion, when the oil-impregnated bearing portion c becomes high in temperature, the felt member d and the relief oil (replenishment oil) escape when thermally expanded. Since it is necessary to provide a space, it is necessary to leave a gap. However, if you do this
As the oil-impregnated bearing portion c becomes higher in temperature, the viscosity of the oil becomes lower. For this reason, the supplementary oil that has been impregnated substantially uniformly over the entire circumference of the bearing portion c flows to the lower portion of the felt member d. And a large amount of them are accumulated, and these are dropped as oil droplets and are accumulated at the lowermost portion of the inner bottom wall a of the bearing yoke portion. However, the replenishment oil e accumulated at the lowermost portion does not come into contact with the felt member d, so that it cannot return to the felt member d anymore and cannot be reused as it is, and impregnates the felt member d. There is a problem that the amount of effective replenishment oil is reduced and the lubrication performance for a long time is impaired.

[Means for Solving the Problems] The present invention was devised with the object of providing a felt member for oil-impregnated bearings of an electric motor, which can eliminate these drawbacks in view of the above-mentioned circumstances. Use the oil-impregnated bearing part, which is supported at both ends in the axial direction by the bearing yoke part and the metal retainer, to support the shaft of the motor shaft in the bearing yoke part of the electric motor mounted so that the axial direction becomes horizontal. In an electric motor configured, an outer peripheral edge portion of a refueling oil felt member arranged between the bearing yoke portion and the metal retainer in a state of being in contact with the outer periphery of the oil replenishing bearing portion so as to replenish the oil replenishing bearing portion. Among them, at least the lowermost portion is a protruding contact portion that extends toward the lowermost portion of the inner bottom wall of the bearing yoke portion, and the rest is thin-walled apart from the inner bottom wall of the bearing yoke portion. It is a thing.

In this way, according to the present invention, the felt member can be impregnated again with the lubricating oil accumulated at the lowermost end of the inner bottom wall of the bearing yoke portion while ensuring the escape space at the time of thermal expansion. It is the one.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

In the drawings, 1 is an electric motor, 2 is a bearing yoke portion formed at both ends of an outer housing of the electric motor 1, 3 is an electric motor shaft, and 4 is an oil-impregnated member such as a sintered material that pivotally supports both ends of the electric motor shaft 3. The bearing portion 4 is composed of a front end edge portion of the inner wall 21 of the bearing yoke portion 2 and an elastic metal retainer 6 engaging with the inner wall 21 so that both end edge portions in the axial direction are supported. Has been done. Reference numeral 5 denotes a thrust washer which is incorporated so as to be sandwiched from both sides of the bearing portion 4.

Reference numeral 10 denotes a felt member which is mounted so as to cover the outer peripheral surface of the bearing portion 4 and which supplies replenishing oil. The felt member 10 is impregnated with lubricating oil for replenishing oil. 10 is formed from a sheet of expensive animal hair, such as wool, into a predetermined shape by a press-cutting die or the like. In the embodiment of the present invention, as shown in FIG.
When the electric motor 1 is installed on the body side so that the electric motor shaft 3 faces the substantially horizontal direction, the lowermost portion 11 of the felt member 10 faces the lowermost portion of the inner bottom wall 21 of the bearing yoke portion 2. Is extended and becomes a protruding contact portion, and the remaining portion has a thin deformed annular shape separated from the inner bottom wall 21 of the bearing yoke portion 2.

Further, the motor shaft 3 protruding to the outside of the bearing yoke portion 2
A fan 7 is attached to the portion with a bolt 8.

In the embodiment of the present invention configured as described above, when the motor shaft 3 of the motor 1 is installed horizontally and the motor 1 rotates at a high speed, the temperature of the motor shaft 3 and the bearing portion 4 is increased due to friction heat. As a result, the lubricating oil that has been impregnated in the felt member 10 gradually decreases in viscosity and becomes easier to flow, so that the lubricating oil exudes from the felt member 10 and is replenished to the sintered bearing portion 4 side. The inner surface of the motor shaft will be lubricated, but the lubricating oil will flow out due to the decrease in viscosity of the lubricating oil due to the rise in temperature, and the lowermost inner wall 21 of the bearing yoke portion 21 will flow out.
Will accumulate. However, since the lowermost part of the felt member 10 extends downward and is in contact with the lowermost portion of the inner bottom wall 21, the lubricating oil accumulated at the lowermost portion of the inner bottom wall 21 must be impregnated into the felt member 10 again. Then, since it remains stored in the lowermost part of the inner bottom wall 21, it can be effectively avoided and the last lubricating oil can be used.

As described above, in the embodiment of the present invention, the lubricating oil with which the felt member 10 is impregnated has the inner bottom wall of the bearing yoke portion 2.
Even if it accumulates at the bottom of 21, the accumulated lubricating oil will impregnate the felt member 10 again via the protruding contact portion 11. Moreover, the felt member 10 is separated from the inner bottom wall 21 except for the protruding contact portion 11, and the felt member 10 and the inner bottom wall 21 are separated from each other.
As a result of being able to secure a clearance between the felt member 10 and the lubricating oil which is an escape space when the lubricating oil thermally expands, the lubricating oil can be used to the end without waste, and the lubricating oil can be supplied to the bearing portion 4 for a long period of time. Will be done.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but the outer shape of the felt member is not annular, and as shown in FIG. 3, the abutment portions 11 at the corner portions contact the bearing yoke inner wall 21 at a plurality of locations. The felt member 12 may have a quadrangular shape or a polygonal shape so as to do, and in this case, it is of course possible to expect the same operational effects as those of the above-mentioned embodiment, and further, the molding yield of an expensive felt member is increased. It can be effectively implemented without damage.

[Effects] In summary, since the present invention is configured as described above, the lubricating oil impregnated in the felt member flows down as the temperature rises and falls to the bottom of the inner bottom wall of the bearing yoke. Even if it accumulates, the accumulated lubricating oil will impregnate the felt member again via the protruding contact portion formed at the lowermost portion of the felt member, and accumulate at the lowermost end portion of the inner bottom wall. It will never be left alone.

In addition, this felt member is separated from the inner bottom wall except for the protruding contact portion, and a gap can be secured between the felt member and the inner bottom wall, which is an escape space when the felt member and the lubricating oil thermally expand. As a result, the lubricating oil does not run off from the metal retainer due to thermal expansion and the like, and it can be used up to the end without waste, so that the bearing portion can be reliably lubricated for a long period of time.

[Brief description of drawings]

The drawings show an embodiment of a felt member for oil-impregnated bearings of an electric motor according to the present invention. FIG. 1 is a transverse cross-sectional view of the inside of a bearing portion of the electric motor, and FIG. 2 is a vertical sectional view taken along line AA of FIG. FIG. 4 is a vertical sectional view of a bearing portion showing another felt member, and FIG. 4 is a vertical sectional view of a conventional bearing portion. In the figure, 2 is a bearing yoke, 3 is a motor shaft, 4 is a bearing portion, and 10
Is a felt member, and 11 is a protruding contact portion.

Claims (1)

[Scope of utility model registration request] 1. An oil-impregnated bearing portion in which both end portions in the axial direction are supported by a bearing yoke portion and a metal retainer for supporting a shaft of an electric motor shaft in a bearing yoke portion of an electric motor mounted in a horizontal axial direction. In the electric motor configured to be used, a felt for replenishing oil is provided between the bearing yoke portion and the metal retainer in a state of being in contact with the outer periphery of the oil impregnating bearing portion for replenishing oil to the oil impregnating bearing portion. At least the lowermost portion of the outer peripheral edge portion of the member is a protruding contact portion that extends toward the lowermost portion of the inner bottom wall of the bearing yoke portion, and the rest is thin-walled so as to be separated from the inner bottom wall of the bearing yoke portion. Felt member for oil-impregnated bearing of electric motor.