A motor that can extend the life of an oil-impregnated bearing

Abstract

The present invention relates to an electric motor capable of prolonging the service life of an oil-impregnated bearing, which comprises end covers, an oil-impregnated bearing, a stator and a rotor. After the rotor is installed in the stator, the combination is installed on the oil-impregnated bearing. The oil-impregnated bearing is installed in the end cover. The end cover is provided with a bearing chamber and an oil injection port. An oil storage groove is arranged in the bearing chamber. One end of the oil storage groove is inside the end cover, and the other end is in contact with the outer circumferential surface of the oil-impregnated bearing. The oil injection port is axially arranged, with one end connected to the oil storage groove and the other end connected to the outer end face of the end cover. Compared with the prior art, the present invention has the advantages of being installable in any manner and greatly increasing the service life of the oil-impregnated bearing, etc.

Description

Technical Field

[0001] The present invention relates to a motor, and more particularly to a motor capable of extending the service life of an oil-impregnated bearing. Background Art

[0002] Oil-impregnated bearings have been widely used due to their low cost, convenient use, easy control of dimensions, and various shapes. However, with the progress of technology, higher requirements are put forward for the use environment of oil-impregnated bearings. Especially in an environment with coexisting low and high temperatures, the loss of oil in the oil-impregnated bearing is aggravated, and the service life is reduced. How to ensure sufficient grease in the oil-impregnated bearing has become the key technology for extending the service life of the oil-impregnated bearing.

[0003] For example, as Figure 1 shown, Chinese Patent Publication No. CN103248161B discloses a motor with an oil storage function, revealing that an enlarged oil storage space for communicating the oil return channel is jointly formed among the blocking part, the shaft tube part of the insulation kit and the bearing for storing more lubricating oil. However, this patent is obviously applicable to an outer rotor motor. In addition, since the enlarged oil storage space has an open end, the motor can only be installed vertically, otherwise the design will be invalid due to oil leakage. As Figure 2 shown, Chinese Patent Publication No. CN209150870U introduces a motor with an oil storage chamber structure, and its oil storage chamber is composed of a hollow boss of the end cover and two "convex"-shaped oil-impregnated bearings. This design cannot achieve the purpose of oil storage, even though it mentions adding anti-leakage rings at both ends of the oil-impregnated bearing. There are two reasons: 1) The inner diameter of the oil-impregnated bearing is loosely fitted with the shaft, and a sealed oil storage chamber cannot be formed; 2) The anti-leakage ring is closely attached to the oil-impregnated bearing. If axial sealing is to be achieved, the anti-leakage ring also needs to be closely attached to the rotating shaft, which will cause the motor itself to jam or have a large frictional loss. Summary of the Invention

[0004] The purpose of the present invention is to provide a motor capable of extending the service life of an oil-impregnated bearing to overcome the defects of the above-mentioned prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to one aspect of the present invention, there is provided a motor capable of extending the service life of an oil-impregnated bearing, including an end cover, an oil-impregnated bearing, a stator and a rotor. After the rotor is installed in the stator, it is integrally installed on the oil-impregnated bearing. The oil-impregnated bearing is installed in the end cover. The end cover is provided with a bearing chamber and an oil injection port. An oil storage groove is provided in the bearing chamber. One end of the oil storage groove is inside the end cover, and the other end is in contact with the outer cylindrical surface of the oil-impregnated bearing. The oil injection port is axially provided, with one end connected to the oil storage groove and the other end connected to the outer end surface of the end cover.

[0007] As a preferred technical solution, the motor further includes a first sealing groove and a second sealing groove provided at both ends of the oil storage tank; the first sealing groove and the second sealing groove are both arranged in the bearing chamber, or the first sealing groove and the second sealing groove are both arranged on the outer contour surface of the oil-impregnated bearing, or the first sealing groove is arranged in the bearing chamber and the second sealing groove is arranged on the outer contour surface of the oil-impregnated bearing.

[0008] As a preferred technical solution, the oil storage tank is a first circular ring with a required angle.

[0009] As a preferred technical solution, the angle of the first circular ring is 180°.

[0010] As a preferred technical solution, the oil storage tank is a plurality of second circular rings with a set angle, and the number of oil injection ports is the same as the number of second circular rings.

[0011] As a preferred technical solution, the angles of the plurality of second circular rings are the same and are evenly distributed.

[0012] As a preferred technical solution, a corresponding rubber plug is provided on the oil injection port.

[0013] As a preferred technical solution, a corresponding first sealing ring is provided on the first sealing groove, and a corresponding second sealing ring is provided on the second sealing groove.

[0014] As a preferred technical solution, a boss for axial positioning is provided on the outer contour surface of the oil-impregnated bearing.

[0015] As a preferred technical solution, the rotor is a permanent magnet or a wound rotor, and the stator is a slotted wound stator, a hollow cup stator or a permanent magnet stator.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1) The lubricating oil storage of the present invention is truly sealed, and the motor can be installed in any way;

[0018] 2) The lubricating oil of the present invention can be supplemented through the oil injection port at any time, greatly increasing the service life of the oil-impregnated bearing

[0019] 3) The lubricating oil of the present invention can be selected with a lower viscosity, which is beneficial to reducing the loss in a low-temperature environment, and at the same time, there is no longer a worry about the problem of insufficient lubricating oil caused by easier loss at high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of CN103248161B in the prior art;

[0021] Figure 2It is a schematic structural diagram of CN209150870U in the prior art;

[0022] Figure 3 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0023] Figure 4 It is a sectional structural diagram of Embodiment 1 of the present invention;

[0024] Figure 5 It is a schematic structural diagram of Embodiment 2 of the present invention;

[0025] Figure 6 It is a sectional structural diagram of Embodiment 2 of the present invention;

[0026] Figure 7 It is a schematic structural diagram of the end cover of Embodiment 3 of the present invention;

[0027] Figure 8 It is a sectional structural diagram of the end cover of Embodiment 3 of the present invention;

[0028] Among them, 21 is the end cover, 211 is the oil storage tank, 212 is the oil injection port, 213 is the first sealing groove, 214 is the outer end face of the end cover, and 215 is the bearing chamber;

[0029] 22 is the oil-impregnated bearing, 221 is the second sealing groove, and 222 is the outer contour surface;

[0030] 23 is the stator, 24 is the rotor, 25 is the rubber plug, 26 is the first sealing ring, 27 is the second sealing ring, 28 is the lubricating oil, 211' is the first ring, and 211" is the second ring. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] As Figure 3-4As shown in the figure, a motor capable of extending the service life of an oil-impregnated bearing includes an end cover 21, an oil-impregnated bearing 22, a stator 23, and a rotor 24. After the rotor 24 is installed in the stator 23, they are together mounted on the oil-impregnated bearing 22. The oil-impregnated bearing 22 is installed in the end cover 21. The end cover 21 is provided with a bearing chamber 215 and an oil injection port 212. An oil storage groove 211 is provided in the bearing chamber 215. The oil storage groove 211 is a circular ring with a rectangular cross-section or a rotating structure with any other cross-sectional shape. One end of the oil storage groove 211 is inside the end cover 21, and the other end is in contact with the outer cylindrical surface of the oil-impregnated bearing 22. The oil injection port 212 is axially opened, with one end connected to the oil storage groove 211 and the other end connected to the outer end face 214 of the end cover. Therefore, this motor is a motor applicable to an inner rotor with an oil storage structure and can be installed horizontally, vertically, or in other ways required by customers. This motor can be brushed or brushless.

[0034] The motor further includes a first sealing groove 213 and a second sealing groove 221 provided at both ends of the oil storage groove 211. The first sealing groove 213 and the second sealing groove 221 are both provided in the bearing chamber 215, or both the first sealing groove 213 and the second sealing groove 221 are provided on the outer contour surface of the oil-impregnated bearing 22, or the first sealing groove 213 is provided in the bearing chamber 215 and the second sealing groove 221 is provided on the outer contour surface of the oil-impregnated bearing 22.

[0035] A corresponding rubber plug 25 is provided on the oil injection port 212. A corresponding first sealing ring 26 is provided on the first sealing groove 213, and a corresponding second sealing ring 27 is provided on the second sealing groove 221. A boss for axial positioning is provided on the outer contour surface 222 of the oil-impregnated bearing 22 for convenient installation.

[0036] The rotor 24 is a permanent magnet or a wound rotor, and the stator 23 is a slotted wound stator, a hollow cup stator, or a permanent magnet stator.

[0037] Embodiment 2

[0038] As Figure 5 and 6 shown, the oil storage groove 211 is a first circular ring 211' with a required angle. Preferably, the angle of the first circular ring 211' is 180°. This design can leave the required space in the end cover, facilitating the machining of wire outlet holes for motors that need to lead out wires.

[0039] Embodiment 3

[0040] As Figure 7 and 8As shown, the oil storage tank 211 is a plurality of second circular rings 211" with a set angle, and the number of the oil injection ports 212 is the same as that of the second circular rings 211". Preferably, the angles of the plurality of second circular rings 211" are the same and are evenly arranged. This design is beneficial for the front end cover to increase customer installation holes. Correspondingly, the number of the oil injection holes and the rubber plugs should be consistent with the number of the oil storage tanks.

[0041] Embodiment 4

[0042] The motor structure of the present invention can be selected for a single end cover, or the structures of any one of Embodiments 1-3 can be used for both end covers at the same time, or any combination of the two.

[0043] As mentioned above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A motor capable of extending the service life of an oil-impregnated bearing, comprising an end cover (21), an oil-impregnated bearing (22), a stator (23) and a rotor (24). After the rotor (24) is installed in the stator (23), the combination is mounted on the oil-impregnated bearing (22), and the oil-impregnated bearing (22) is installed in the end cover (21). It is characterized in that, The described end cover (21) is provided with a bearing chamber (215) and an oil injection port (212). An oil storage groove (211) is provided in the bearing chamber (215). One end of the oil storage groove (211) is inside the end cover (21), and the other end is in contact with the outer cylindrical surface of the oil-impregnated bearing (22). The oil injection port (212) is axially provided, with one end connected to the oil storage groove (211) and the other end connected to the outer end surface (214) of the end cover; The described motor further includes a first sealing groove (213) and a second sealing groove (221) provided at both ends of the oil storage groove (211); both the first sealing groove (213) and the second sealing groove (221) are provided in the bearing chamber (215), or both the first sealing groove (213) and the second sealing groove (221) are provided on the outer contour surface of the oil-impregnated bearing (22), or the first sealing groove (213) is provided in the bearing chamber (215) and the second sealing groove (221) is provided on the outer contour surface of the oil-impregnated bearing (22); The oil storage groove (211) is a plurality of second circular rings (211”) with a set angle, and the number of the oil injection ports (212) is the same as the number of the second circular rings (211”); the angles of the plurality of second circular rings (211”) are the same and are evenly distributed.

2. The motor for extending the service life of an oil-impregnated bearing according to claim 1, wherein, The oil storage groove (211) is a first circular ring (211’) with a required angle.

3. The motor for extending the service life of an oil-impregnated bearing according to claim 2, wherein, The angle of the first circular ring (211’) is 180°.

4. A motor capable of extending the service life of an oil-impregnated bearing according to claim 1, characterized in that, A corresponding rubber plug (25) is provided on the oil injection port (212).

5. The motor for extending the service life of an oil-impregnated bearing according to claim 1, characterized in that A corresponding first sealing ring (26) is provided on the first sealing groove (213), and a corresponding second sealing ring (27) is provided on the second sealing groove (221).

6. The motor capable of prolonging the service life of the oil-impregnated bearing according to claim 1, wherein, The outer contour surface (222) of the oil-impregnated bearing (22) is provided with a boss for axial positioning.

7. The motor for extending the service life of an oil-impregnated bearing according to claim 1, wherein The rotor (24) is a permanent magnet or a wound rotor, and the stator (23) is a slotted wound stator, a hollow cup stator or a permanent magnet stator.

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