Cooling and lubricating mechanism of motor bearing and motor thereof

Abstract

This invention discloses a cooling and lubrication mechanism for an electric motor bearing and its motor. The cooling and lubrication mechanism for the electric motor bearing includes: an end cover with an axial through hole in the center; a bearing housing disposed in the axial through hole, and a mounting cavity for assembling the bearing within the bearing housing; wherein the end cover also has an oil injection channel and an oil drainage channel. The oil injection channel within the motor's end cover allows for the periodic or irregular injection of new grease to replace the old grease. This grease provides lubrication for the rolling of the bearing balls, and simultaneously, as the bearing rotates, it wets and carries away heat, thus simultaneously achieving heat dissipation for the bearing. Compared to existing independent dual-system designs for lubrication and cooling, the cooling and lubrication mechanism of this invention has a simple structure, low manufacturing cost, and significantly improves the efficiency of grease replacement, while reducing the risk of internal contamination caused by disassembling the end cover.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to an automated motor bearing cooling and lubrication mechanism and its motor. Background Technology

[0002] Bearings in permanent magnet assisted synchronous reluctance motors (PMaSynRM) require regular grease replenishment to maintain the oil film and reduce friction. Regular operation necessitates shutdown and end cover removal, which is not only inefficient but may also introduce contaminants due to improper operation. For example, Chinese patent publication (publication number: CN201210159811.7) discloses an oil-cooled motor for a compressor. This motor uses oil cooling: the front end cover has an oil inlet, and the rear end cover has an oil outlet; the motor housing is surrounded by an outer shell, forming a jacket layer between the motor housing and the outer shell; both the oil inlet and outlet are connected to the jacket layer. Cooling oil enters through the inlet, then flows into the motor's jacket layer, and finally exits through the outlet. During this flow, it carries away heat generated by the front and rear bearings and the stator and rotor excitation, achieving the purpose of cooling the motor. After exiting the outlet, the cooling oil is sprayed into the compression chamber of the screw compressor main unit through an oil injection pipe, thus circulating the oil for reuse.

[0003] In existing technologies, the cooling oil needs to pass rapidly through the front bearing, the interlayer, and the rear bearing to form a circulating cooling system to remove the heat generated by the bearings and the excitation of the stator and rotor. Existing cooling structures only achieve bearing cooling and cannot simultaneously achieve bearing lubrication; that is, cooling and lubrication are incompatible, resulting in a complex internal structure and high manufacturing costs for the motor. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cooling and lubrication mechanism for motor bearings and its motor, so as to solve the technical problem that the existing cooling structure of motor bearings cannot achieve lubrication simultaneously.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide a cooling and lubrication mechanism for an electric motor bearing, comprising: An end cap, wherein an axial through hole is provided in the middle of the end cap; A bearing housing, which is connected to the end cover, and the bearing housing has a mounting cavity for assembling a bearing; The end cap is also provided with an oil injection channel and an oil discharge channel, both of which are connected to the mounting cavity. Cooling lubricating oil can be injected into the mounting cavity through the oil injection channel and discharged through the oil discharge channel.

[0006] The inlet of the oil injection channel extends to the outer surface of the end cap, the outlet of the oil injection channel extends to the cavity wall of the mounting cavity, and the outlet is distributed opposite to the outer ring surface of the bearing.

[0007] The outlet of the oil injection channel extends to the top wall of the mounting cavity.

[0008] The oil injection channel is a straight channel extending radially along the end cap.

[0009] The oil drain inlet of the oil drain channel extends to the bottom cavity wall of the mounting cavity.

[0010] The oil injection channel is a spiral guide channel located inside the end cap.

[0011] The bearing housing includes a front housing and a rear housing connected to the front housing, the front housing and the rear housing together forming the mounting cavity.

[0012] The front seat and the rear seat are each provided with an annular groove and an oil guide channel communicating with the annular groove. The annular groove is connected to the mounting cavity, and the oil outlet of the oil guide channel extends to the space where the end face of the bearing is located.

[0013] The end portion of the oil guide channel is a pressurized structure with a gradually decreasing orifice diameter.

[0014] Secondly, embodiments of the present invention provide an electric motor that includes a lubrication and cooling mechanism for the motor bearings as described above.

[0015] The cooling and lubrication mechanism for the motor bearing of this invention includes an oil injection channel within the motor's end cover. New grease is periodically or irregularly injected through this channel to replace the old grease. This grease lubricates the rolling of the bearing balls and simultaneously carries away heat as the bearing rotates, thus achieving heat dissipation. Compared to existing independent dual-system lubrication and cooling designs, the cooling and lubrication mechanism of this invention has a simple structure, low manufacturing cost, and significantly improves the efficiency of grease replacement, while reducing the risk of internal contamination caused by disassembling the end cover.

[0016] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below. Attached Figure Description

[0017] Figures 1 to 3 These are schematic diagrams of the overall structure of the motor from different perspectives according to an embodiment of the present invention.

[0018] Figure 4 This is a side view of the motor according to an embodiment of the present invention.

[0019] Figure 5 for Figure 4 The sectional view shown is along line AA.

[0020] Figure 6 for Figure 5 The diagram shows a magnified view of part A.

[0021] Figure 7 for Figure 5 The diagram shows a magnified view of part B.

[0022] Figure 8 for Figure 4 The BB-directed sectional view is shown.

[0023] Figure 9 This is an exploded view of the motor body and bearing lubrication and cooling structure of the motor according to an embodiment of the present invention.

[0024] Figure 10 This is a radial cross-sectional view of the cooling and lubrication mechanism of the motor bearing according to an embodiment of the present invention.

[0025] Figure 11 and Figure 12 These are schematic diagrams of the cooling and lubrication mechanism for a motor bearing according to an embodiment of the present invention from different perspectives.

[0026] Figure 13 This is an exploded view of the cooling and lubrication mechanism for a motor bearing according to an embodiment of the present invention.

[0027] Figure 14 This is a schematic diagram of the front seat portion of the cooling and lubrication mechanism for a motor bearing according to an embodiment of the present invention.

[0028] Figure 15 This is a schematic diagram of the rear seat portion of the cooling and lubrication mechanism for a motor bearing according to an embodiment of the present invention.

[0029] Figure 16 This is a schematic diagram of the bearing portion of the cooling and lubrication mechanism for a motor bearing according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures: Motor 100, cooling and lubrication mechanism for motor bearing 200, end cover 2, axial through hole 201, bearing seat 3, mounting cavity 30, oil injection channel 21, oil discharge channel 22, inlet 211, outlet 212, outer ring surface 611, annular space 2021, front seat body 31, rear seat body 32, first through hole 313, first groove 312, first annular connecting part 314, rear seat body 321, second through hole 323, second groove 322 The components include: second annular connecting part 324, annular sidewall 202, first annular groove 301, first guide channel 3011, second annular groove 302, second guide channel 3021, end part 3012, end section 3022, oil nozzle 5, first oil drain hole 310, second oil drain hole 320, outer ring 61, inner ring 62, gap 621, rolling element 63, motor housing 1, control box 11, rotating shaft 4, bearing 6, and disc-shaped body 311. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this invention, terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] Bearings in permanent magnet assisted synchronous reluctance motors (PMaSynRM) require regular grease replenishment to maintain the oil film and reduce friction. Regular operation necessitates shutdown and end cover removal, which is not only inefficient but may also introduce contaminants due to improper operation. For example, Chinese patent publication (publication number: CN201210159811.7) discloses an oil-cooled motor for a compressor. This motor uses oil cooling: the front end cover has an oil inlet, and the rear end cover has an oil outlet; the motor housing is surrounded by an outer shell, forming a jacket layer between the motor housing and the outer shell; both the oil inlet and outlet are connected to the jacket layer. Cooling oil enters through the inlet, then flows into the motor's jacket layer, and finally exits through the outlet. During this flow, it carries away heat generated by the front and rear bearings and the stator and rotor excitation, achieving the purpose of cooling the motor. After exiting the outlet, the cooling oil is sprayed into the compression chamber of the screw compressor main unit through an oil injection pipe, thus circulating the oil for reuse. In existing technologies, cooling oil needs to pass rapidly through the front bearing, interlayer, and rear bearing to form a circulating cooling system, so as to simultaneously remove the heat generated by the bearings and the excitation of the stator and rotor. Existing cooling structures only achieve bearing cooling and cannot simultaneously achieve bearing lubrication; that is, cooling and lubrication are incompatible, resulting in a complex internal structure and high manufacturing costs for the motor. Based on the above requirements, embodiments of the present invention provide a cooling and lubrication mechanism 200 for motor bearings and a motor 100 thereof.

[0037] Please see Figures 1 to 16In this embodiment, the cooling and lubrication mechanism 200 of the motor bearing is a component of the motor 100. The motor 100 includes a motor housing 1, a stator assembly and a rotor assembly disposed inside the motor housing 1, and a front cover assembly and a rear cover assembly respectively connected to both ends of the motor housing 1. A control box 11 is provided on the side wall of the motor housing 1. A rotating shaft 4 is axially centered on the rotor assembly, with both ends of the rotating shaft 4 extending from the front cover assembly and the rear cover assembly respectively, for outputting rotational power. Bearings 6 are sleeved on the front and rear ends of the rotating shaft 4, with the bearing 6 at the front end disposed within the front cover assembly and the bearing 6 at the rear end disposed within the rear cover assembly. In this embodiment, the cooling and lubrication mechanism of the bearing 6 disposed within the front cover assembly is used as an example to describe the cooling and lubrication mechanism 200 of the motor bearing in this embodiment. The cooling and lubrication mechanism of the bearing inside the rear cover assembly can be referred to the cooling and lubrication mechanism 200 of the motor bearing.

[0038] Please refer to it again. Figures 1 to 16 The cooling and lubrication mechanism 200 for the motor bearing in this embodiment includes: End cap 2, the end cap 2 has an axial through hole 201 in the middle, and the end cap 2 is fixedly connected to the front opening of the motor housing 1; The bearing housing 3 is connected to the end cover 2. The bearing housing 3 has a mounting cavity 30 for assembling the bearing 6. The through hole of the bearing 6 is located in the axial through hole 201 so as to allow the rotating shaft 4 to pass through. The end cap 2 is also provided with an oil injection channel 21 and an oil discharge channel 22. Both the oil injection channel 21 and the oil discharge channel 22 are connected to the mounting cavity 30. Cooling lubricating oil can be injected into the mounting cavity 30 through the oil injection channel 21 and can be discharged through the oil discharge channel 22.

[0039] In this embodiment, the cooling and lubrication mechanism 200 of the motor bearing has an oil injection channel 21 and an oil discharge channel 22 connected to the mounting cavity 30 within the end cover 2. Cooling and lubricating oil can be injected into the mounting cavity 30 through the oil injection channel 21, and discharged through the oil discharge channel 22. Since the mounting cavity 30 contains a bearing 6, which rotates at high speed with the motor shaft 4, this mechanism reduces friction, improves motor rotation efficiency, and reduces energy consumption. The bearing 6 wears and generates heat during operation. Injecting or discharging cooling and lubricating oil (such as grease) through the oil injection channel 21 and the oil discharge channel 22 allows for rapid replacement of the cooling and lubricating oil. Simultaneously, the cooling and lubricating oil provides both cooling and lubrication for the motor bearing 6, eliminating the need for two separate cooling and lubrication systems and reducing the complexity of the motor's internal structure.

[0040] Furthermore, the cooling and lubrication mechanism 200 for the motor bearing in this embodiment, by providing an oil injection channel 21 and an oil discharge channel 22 inside the end cover 2, allows for quick oil injection or discharge when changing the cooling and lubricating oil without disassembling the end cover 2, bearing 4, and mounting base 3. Compared to the existing whole-machine disassembly and replacement method, the replacement time is reduced from the existing 2 hours to 5 minutes, significantly reducing the replacement time, improving replacement efficiency, reducing equipment downtime, and thus improving production efficiency.

[0041] Both the oil injection channel 21 and the oil discharge channel 22 are connected to the mounting cavity 30. During the replacement of cooling lubricating oil (such as grease), the grease enters the mounting cavity 30 from the oil injection channel 21 and passes through the assembly reserved gap between the mounting cavity 30 and the bearing 6 to enter the interior of the bearing 6, so that the old grease is squeezed out from the oil discharge channel 22. During the discharge of the old grease, the friction and wear particles in the gap 621 of the bearing 6 are discharged simultaneously, reducing the friction loss of the wear particles on the subsequent rotation of the bearing 6.

[0042] Please refer to it again. Figures 5 to 7 The inlet 211 of the oil injection channel 21 extends to the outer surface of the end cap 2, and the outlet 212 of the oil injection channel 21 extends to the cavity wall of the mounting cavity 30. The outlet 212 is distributed opposite to the outer ring surface 611 of the bearing 6. That is, the outlet 212 of the oil injection channel 21 is located directly opposite the outer ring surface 611 of the bearing 6, so that the cooling lubricating oil injected through the oil injection channel 21 first flows through the reserved space of the mounting cavity 30 directly opposite the outer ring surface 611 of the bearing 6. Since the bearing 6 has a symmetrical structure, the cooling lubricating oil injected into the outer ring surface 611 first flows axially from both sides of the outer ring surface 611 to the front and rear ends of the bearing 6, so that the cooling lubricating oil can fully cool and lubricate the bearing 6.

[0043] like Figure 6 As shown, an annular space 2021 is reserved between the outer ring 61 of the bearing 6 and the mounting cavity 30. The cooling and lubricating oil injected by the oil injection channel 21 first enters the annular space 2021. Under the drive of the rotation and vibration of the bearing 6, it evenly wets into the gap 621 of the bearing 6 to lubricate the rolling element 63.

[0044] The outlet 212 of the oil injection channel 21 extends to the top of the mounting cavity 30. The top of the mounting cavity 30 includes both the center position of the top of the mounting cavity 30 and a position near the center. Figure 2The motor 100 is shown in its operating state. From this perspective, the top of the mounting cavity 30 is also the highest longitudinal position within the mounting cavity 30. The top position of the mounting cavity 30 is also the non-load area. When the rotating shaft 4 is stationary, the rotating shaft 4 is supported at the bottom of the mounting cavity 30 by the bearing 6. At this time, the annular space 2021 above the bearing 6 is slightly larger than the annular space 2021 below the bearing 6. Setting the outlet 212 of the oil injection channel 21 in the non-load area can reduce the oil injection resistance and also achieve sufficient wetting of the cooling lubricating oil.

[0045] In this embodiment, the oil injection channel 21 is a straight channel extending radially along the end cap 2. The straight-through oil injection channel 21 not only reduces machining difficulty but also reduces oil injection resistance and shortens the replacement time of the cooling lubricating oil. Of course, in other embodiments, the oil injection channel 21 can be designed as any other channel structure according to actual assembly and machining needs.

[0046] Please refer to it again. Figure 10 The oil drain inlet of the oil drain channel 22 extends to the bottom wall of the mounting cavity 30. That is, the oil drain inlet of the oil drain channel 22 is directly opposite the outlet 212 of the oil filling channel 21. The outlet 212 of the oil filling channel 21 is located at the highest point of the mounting cavity 30, while the oil drain inlet is located at the lowest point of the mounting cavity 30. This helps to fully replace the old cooling lubricating oil and reduce the residue of old grease in the mounting cavity 30.

[0047] In another embodiment, the oil injection channel 21 is a spiral guide channel formed inside the end cap 2. Changing the oil injection channel 21 from a straight channel to a spiral guide channel increases the length of the cooling lubricating oil flow within the channel 21. When the grease is injected from the outside, it will circle several times along the spiral channel 40. During this process, the grease undergoes sufficient heat exchange with the end cap 2 (which is typically at a higher temperature and absorbs heat from the housing), preheating the grease to near its operating temperature. Injecting the preheated grease into the bearing 6 avoids the sudden cooling and shrinkage stress caused by cold grease directly impacting the high-temperature bearing raceway, thus improving the fatigue life of the bearing 6. Of course, it is understood that in other embodiments, to increase the guide length and facilitate sufficient heat exchange with the end cap 2, the oil injection channel 21 is not limited to a spiral guide channel and can also be any other circumferential flow path.

[0048] like Figure 16 As shown, the bearing 6 includes an outer ring 61, an inner ring 62, and a plurality of rolling elements 63 that are rolled within a reserved space between the outer ring 61 and the inner ring 62. A gap 621 is provided between adjacent rolling elements 63 for lubrication with grease. The outer ring surface 611 refers to the outer cylindrical sidewall of the outer ring 61.

[0049] Please refer to it again. Figures 11 to 15The bearing housing 3 includes a front housing 31 and a rear housing 32 connected to the front housing 31. The front housing 31 and the rear housing 32 together form the mounting cavity 30. Specifically, the mounting cavity 30 is a cylindrical cavity adapted to the bearing 6.

[0050] The front seat body 31 includes: a disc-shaped body 311, a first through hole 313 axially provided in the middle of the disc-shaped body 311, a first groove 312 axially recessed in the disc-shaped body 311, the first through hole 313 being opened at the bottom of the first groove 312, and a first annular connecting part 314 being formed at the edge of the first groove 312.

[0051] Similarly, the rear seat body 32 includes a rear seat body 321, which has a structure roughly the same as the disc-shaped body 311. A second through hole 323 is axially formed in the center of the rear seat body 321, and a second groove 322 is axially recessed within the rear seat body 321. The second through hole 323 is located at the bottom of the second groove 322, and the edge of the second groove 322 forms a second annular connecting portion 324. The front seat body 31 and the rear seat body 32 are aligned and assembled onto the end cover 2 via the first annular connecting portion 314 and the second annular connecting portion 324. After the front seat body 31 and the rear seat body 32 are connected to the end cover 2, the first groove 312 and the second groove 322 together form the mounting cavity 30. The first through hole 313 and the second through hole 323 are directly opposite each other and aligned with the central through hole of the bearing 6 for the passage of the rotating shaft 4.

[0052] Wherein, the sidewall of the axial through hole 201 of the end cover 2 is an annular sidewall 202. The front seat 31 is connected to the outer end face of the annular sidewall 202 through the first annular connecting part 314, and the rear seat 32 is connected to the inner end face of the annular sidewall 202 through the second annular connecting part 324. After assembly, the first groove 312, the second groove 322 and the annular sidewall 202 form the mounting cavity 30, which is used to assemble the bearing 6 and form a grease-impregnating space.

[0053] Please refer to it again. Figure 6 and Figure 7The front seat 31 is also provided with a first annular groove 301, which communicates with the mounting cavity 30. After the injected cooling and lubricating grease is injected into the annular space 2021, it flows back to the first annular groove 301. The first annular groove 301 is arranged approximately parallel to the outer ring 61 of the bearing 6. The front seat 31 is also provided with a first guide channel 3011 that communicates with the first annular groove 301. The oil outlet of the first guide channel 3011 is located outside the gap 621. That is, by providing the first annular groove 301 on the front seat 31, the grease can be evenly guided to the outer end of the bearing 6, and further guided directly to the gap 621 of the bearing 6 through the first guide channel 3011, thereby more accurately delivering the grease to the gap 621 of the bearing 6, thus avoiding the problem of uneven grease injection distribution.

[0054] Similarly, the rear seat 32 is also provided with a second annular groove 302, which communicates with the mounting cavity 30. After the injected cooling and lubricating grease is injected into the annular space 2021, it flows again to the second annular groove 302. The first annular groove 301 and the second annular groove 302 are located on the outer end side and the inner end side of the bearing 6, respectively. The second annular groove 302 is arranged approximately parallel to the outer ring 61 of the bearing 6. The rear seat 32 is also provided with a second guide channel 3021 that communicates with the second annular groove 302. The oil outlet of the second guide channel 3021 is located on the outside of the gap 621. That is, by providing the second annular groove 302 on the rear seat 32, the grease can be evenly guided to the outer end of the bearing 6, and further guided directly to the gap 621 of the bearing 6 through the second guide channel 3021, thereby more accurately delivering the grease to the gap of the bearing 6, thus avoiding the problem of uneven grease injection distribution.

[0055] The first guide channel 3011 and the second guide channel 3021 provided in the front seat 31 and the rear seat 32 respectively accurately inject grease from the outer end and the inner end of the bearing 6 into the gap 621 of the bearing 6, avoiding the defect that the gap 621 of the bearing 6 cannot be fully wetted by grease. Obviously, there are multiple first guide channels 3011 and second guide channels 3021, which are evenly distributed in a circular shape.

[0056] Furthermore, since the injected grease has a certain viscosity, in order to ensure that the grease is quickly and fully injected into all the gaps 621 of the bearing 6, the end portion 3012 of the first oil guiding channel 3011 is a pressurized structure with a gradually decreasing orifice diameter. Similarly, the end section 3022 of the second flow guiding channel 3021 is also a pressurized structure with a gradually decreasing orifice diameter.

[0057] Specifically, such as Figure 6 and Figure 7As shown in the cross-sectional view, the pressurization structure is a V-shaped structure, that is, the end part 3012 and the end section 3022 are conical channels. When the injected grease is output from the conical channel, it has a greater flow speed and force, which can quickly and fully fill the gap 621 of the bearing 6, avoiding the bearing 6 having too large an axial depth, which would prevent the grease from filling the depth position of the gap 621.

[0058] Please refer to it again. Figures 1 to 3 The oil injection channel 21 is also connected to an oil injection nozzle 5 at the inlet 211. The oil injection pipe of the oil injection nozzle 5 is screwed to the oil injection channel 21. The outer wall of the oil injection pipe is provided with external threads, and the part of the oil injection channel 21 near the inlet 211 is provided with internal threads. The two are connected by threaded connection.

[0059] In another embodiment, the oil nozzle 5 can be replaced by an electromagnetic oiler. The electromagnetic oiler is connected to the motor control box 11. The control box 11 can automatically perform oiling, lubrication and cooling at regular intervals and in quantitative amounts based on the motor running time and feedback from the bearing temperature sensor, thereby achieving fully automatic intelligent maintenance.

[0060] Furthermore, the inlet 211 of the oil injection channel 21 can be extended to any position on the outer surface of the end cap 2 as needed, such as the radial outer wall or the axial end wall.

[0061] Please refer to it again. Figure 10 In another embodiment, the oil drain channel 22 may be replaced by a first oil drain hole 310 opened on the front seat 31 or a second oil drain hole 320 opened on the rear seat 32, or the oil drain channel 22 may be connected to the first oil drain hole 310 and the second oil drain hole 320 to form an oil drain channel.

[0062] The cooling and lubrication mechanism for the motor bearing in this embodiment has an oil injection channel inside the motor end cover. New grease is injected periodically or irregularly through this channel to replace the old grease. This grease lubricates the rolling of the bearing balls and also carries away heat as the bearing rotates, thus simultaneously achieving heat dissipation. Compared to existing independent dual-system designs for lubrication and cooling, the cooling and lubrication mechanism of this invention has a simple structure, low manufacturing cost, and significantly improves the efficiency of grease replacement, while reducing the risk of internal contamination caused by disassembling the end cover.

[0063] The above examples are merely illustrative of the technical content of the present invention to facilitate easier understanding by the reader, but do not imply that the implementation of the present invention is limited to these examples. Any technical extensions or re-creations made based on the present invention are protected by the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A cooling and lubrication mechanism for an electric motor bearing, characterized in that, include: An end cap, wherein an axial through hole is provided in the middle of the end cap; A bearing housing is connected to the end cover. The bearing housing has a mounting cavity for assembling a bearing, and the through hole of the bearing is aligned and connected to the axial through hole. The end cap is also provided with an oil injection channel and an oil discharge channel, both of which are connected to the mounting cavity. Cooling lubricating oil can be injected into the mounting cavity through the oil injection channel and discharged through the oil discharge channel.

2. The cooling and lubrication mechanism for the motor bearing according to claim 1, characterized in that, The inlet of the oil injection channel extends to the outer surface of the end cap, the outlet of the oil injection channel extends to the cavity wall of the mounting cavity, and the outlet is directly opposite the outer ring surface of the bearing.

3. The cooling and lubrication mechanism for the motor bearing according to claim 2, characterized in that, The outlet of the oil injection channel extends to the top wall of the mounting cavity.

4. The cooling and lubrication mechanism for the motor bearing according to claim 3, characterized in that, The oil injection channel is a straight channel extending radially along the end cap.

5. The cooling and lubrication mechanism for the motor bearing according to claim 4, characterized in that, The oil drain inlet of the oil drain channel extends to the bottom cavity wall of the mounting cavity.

6. The cooling and lubrication mechanism for a motor bearing according to any one of claims 1 to 5, characterized in that, The oil injection channel is a spiral guide channel located inside the end cap.

7. The cooling and lubrication mechanism for a motor bearing according to any one of claims 1 to 5, characterized in that, The bearing housing includes a front housing and a rear housing connected to the front housing, the front housing and the rear housing together forming the mounting cavity.

8. The cooling and lubrication mechanism for the motor bearing according to claim 7, characterized in that, Both the front seat and the rear seat are provided with an annular groove and an oil guide channel communicating with the annular groove. The annular groove is connected to the mounting cavity, and the oil outlet of the oil guide channel extends to the space where the end face of the bearing is located.

9. The cooling and lubrication mechanism for the motor bearing according to claim 8, characterized in that, The end portion of the oil guide channel is a pressurized structure with a gradually decreasing orifice diameter.

10. An electric motor, characterized in that, The motor includes a cooling and lubrication mechanism for the motor bearing as described in any one of claims 1 to 9.

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