CN-122029730-A - Oil recovery mechanism and motor

Abstract

An oil recovery mechanism for recovering oil used for an oil-containing metal bearing includes an oil-containing metal bearing supporting a rotary shaft, and an oil slinger fixed to the rotary shaft, the oil slinger having a main body portion having a portion opposed to the oil-containing metal bearing, and an extension portion extending from the main body portion toward the oil-containing metal bearing side, the extension portion being located outside the oil-containing metal bearing when viewed from a longitudinal direction of the rotary shaft.

Inventors

• Shan Kouming

Assignees

• 松下知识产权经营株式会社

Dates

Publication Date

20260512

Application Date

20240918

Priority Date

20231024

Claims (11)

1. 1. An oil recovery mechanism for recovering oil contained in an oil-containing metal bearing supporting a rotary shaft of a rotary machine, wherein, The oil recovery mechanism includes: The oil-containing metal bearing, and An oil slinger fixed to the rotary shaft, The oil slinger has a main body portion having a portion opposed to the oil-metal bearing, and an extending portion extending from the main body portion toward the oil-metal bearing side, The extending portion is located outside the oil-containing metal bearing in a direction orthogonal to the longitudinal direction when viewed from the longitudinal direction of the rotary shaft.
2. 2. The oil recovery mechanism according to claim 1, wherein, The main body portion has a flange portion protruding outward in a direction orthogonal to the longitudinal direction of the oil-containing metal bearing when viewed from the longitudinal direction of the rotary shaft, The extension extends from the flange portion toward the oil-containing metal bearing side.
3. 3. The oil recovery mechanism according to claim 1, wherein, The oil slinger is fixed to the rotary shaft by being pressed into the rotary shaft.
4. 4. The oil recovery mechanism according to claim 1, wherein, The boundary portion between the inner surface of the main body portion and the inner surface of the extension portion is a curved surface.
5. 5. The oil recovery mechanism according to claim 1, wherein, The oil recovery mechanism further includes an oil adsorbing member that is disposed so as to surround an outer peripheral portion of the oil-containing metal bearing and that adsorbs oil, The tip end portion of the extension portion is close to the oil adsorbing member.
6. 6. The oil recovery mechanism according to claim 5, wherein, The oil adsorbing member is a felt.
7. 7. The oil recovery mechanism according to claim 1, wherein, The oil slinger is formed of a resin material, The dynamic friction coefficient of the oil slinger is 0.3 or less.
8. 8. The oil recovery mechanism according to claim 1, wherein, The oil recovery mechanism further includes a plurality of washers interposed to a portion of the rotating shaft between the oil-containing metal bearing and the oil slinger.
9. 9. The oil recovery mechanism of claim 8, wherein, The outer diameter of the washer closest to the oil-containing metal bearing among the plurality of washers is larger than the outer diameters of the other washers.
10. 10. The oil recovery mechanism according to any one of claims 1 to 9, wherein, The oil recovery mechanism also comprises a cylindrical retainer with a bottom which is internally provided with the oil-containing metal bearing, The open end of the retainer is located on the opposite side of the oil slinger from the oil metal bearing relative to the extension of the oil slinger.
11. 11. An electric motor, wherein, The motor includes: the oil recovery mechanism of any one of claims 1 to 9; A rotor having the rotation shaft, and A stator disposed opposite to the rotor.

Description

Oil recovery mechanism and motor Technical Field The present disclosure relates to an oil recovery mechanism for recovering oil contained in an oil-containing metal bearing supporting a rotary shaft of a rotary apparatus, and an electric motor including the oil recovery mechanism. Background Motors are used for various electric devices such as household electric devices and industrial electric devices. For example, as a motor for an air conditioner, a fan motor in which a rotary fan is mounted on a rotary shaft is known. The motor includes a rotor having a rotation shaft, a stator generating a magnetic force for rotating the rotor, and a bearing rotatably supporting the rotation shaft. In the motor having such a structure, if the lubricant disappears on the sliding surface between the rotary shaft and the bearing, vibration may occur or seizure may occur due to friction during rotation. Therefore, in order to retain lubricating oil on the sliding surface of a rotating shaft and a bearing for a long period of time, as a bearing for supporting the rotating shaft, a technique of using an oil-containing metal bearing in which lubricating oil is infiltrated into a sintered metal has been proposed. However, if an oil-impregnated metal bearing is used, lubricating oil may flow out of the oil-impregnated metal bearing. Then, a technique of preventing the outflow of lubricating oil from an oil-impregnated metal bearing has been proposed (for example, refer to patent document 1). As one of techniques for preventing the outflow of lubricating oil from an oil-impregnated metal bearing, a structure has been studied in which a disc-shaped oil slinger (Slinger) is fixed to a rotating shaft so as to abut against an end surface of the oil-impregnated metal bearing. Fig. 8 is a sectional view of a motor 1X of a comparative example. The motor 1X shown in fig. 8 includes a rotary shaft 11, a rotor 10, a stator 20, an oil-containing metal bearing 31, and an oil slinger 32X. The rotor 10 has a magnet 12 and a frame 13. The stator 20 has a stator core 21 and windings 22. The oil-containing metal bearing 31 supports the rotary shaft 11 of the rotor 10. The oil slinger 32X is fixed to a portion of the rotary shaft 11 between the oil-containing metal bearing 31 and the frame 13. A washer 34X is interposed between the slinger 32X and the frame 13. However, in the motor 1X having such a structure, the lubricating oil flowing out of the oil-containing metal bearing 31 may be thrown off from the oil slinger 32X along the surface of the oil slinger 32X by centrifugal force during rotation, and the lubricating oil may leak out of the oil slinger 32X. As a result, the lubricant oil in the oil-containing metal bearing 31 is exhausted, and the life of the motor 1X is shortened, or the lubricant oil leaks out of the motor 1X. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 8-168202 Disclosure of Invention The present disclosure has been made to solve such a problem. An object of the present disclosure is to provide an oil recovery mechanism and a motor capable of recovering oil flowing out of an oil-containing metal bearing and capable of suppressing leakage of the oil flowing out of the oil-containing metal bearing to the outside. In order to achieve the above object, an oil recovery mechanism according to one aspect of the present disclosure is an oil recovery mechanism for recovering oil contained in an oil-containing metal bearing that supports a rotary shaft of a rotary device, the oil recovery mechanism including the oil-containing metal bearing, and an oil slinger fixed to the rotary shaft, the oil slinger having a main body portion having a portion facing the oil-containing metal bearing, and an extension portion extending from the main body portion toward the oil-containing metal bearing side, the extension portion being located at a position outside a direction orthogonal to the longitudinal direction of the oil-containing metal bearing when viewed from the longitudinal direction of the rotary shaft. Preferably, the main body portion has a flange portion protruding outward in a direction orthogonal to the longitudinal direction of the rotary shaft than the oil-containing metal bearing when viewed from the longitudinal direction. Preferably, the extension portion extends from the flange portion toward the oil-containing metal bearing side. Preferably, the oil slinger is fixed to the rotary shaft by being pressed into the rotary shaft. Preferably, a boundary portion between the inner surface of the main body portion and the inner surface of the extension portion is a curved surface. Preferably, the oil recovery mechanism further includes an oil adsorbing member that is disposed so as to surround an outer peripheral portion of the oil-containing metal bearing and that adsorbs oil. Preferably, a tip end portion of the extension portion is close to the oil adsorbing member. Preferably, the oil adsor