Oil-cooled motor

Abstract

The invention provides a motor, which is applied to the technical field of motors, and particularly relates to an oil-cooled motor, comprising a motor shaft arranged in a rotor in a penetrating manner; the motor end cover is provided with a shaft body accommodating cavity for accommodating the end part of the motor shaft, a bearing mounting part is arranged in the shaft body accommodating cavity, and the motor end cover is also provided with an end cover oil transportation channel; the bearing sleeves the end part of the motor shaft and is mounted at the bearing mounting part; and the lubricating oil storage part is arranged in the shaft body containing cavity and communicates with the end cover oil conveying channel, the lubricating oil storage part is arranged on the side, away from the rotor, of the bearing, and cooling lubricating oil in the lubricating oil storage part can be sprayed out to the bearing in the axial direction. According to the oil-cooled motor, oil is supplied to the lubricating oil storage part arranged in the end cover shaft body accommodating cavity through the end cover oil conveying channel, and is axially supplied to the bearing from one side, far away from the rotor, of the bearing, so that the oil can be easily sprayed to the end surface of the bearing, especially the rolling body, and is blocked by the rotation of the rolling body; and the oil splashes or flows to the inner and outer rings of the bearing for cooling and lubricating.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to an oil-cooled motor. Background Technology

[0002] Currently, the bearing cooling methods in oil-cooled motors are mostly to cool the front and rear bearings by opening holes in the hollow shaft, opening holes in the rotor pressure plate, or using oil flowing down from the spray windings. These methods generally have the following disadvantages: the spray holes are a certain distance from the bearings, and the position of the sprayed bearings is affected by the motor tilt angle and motor speed, resulting in uneven or inadequate cooling of the bearings. Summary of the Invention

[0003] In view of this, this application provides an oil-cooled motor, which provides an oil supply channel on the motor end cover and supplies oil to the lubricating oil storage part provided in the end cover shaft cavity through the oil supply channel, and supplies oil axially to the bearing from the side away from the rotor. In this way, the oil can be more easily sprayed to the end face of the bearing, especially the rolling elements of the bearing, and through the rotation and obstruction of the rolling elements, the oil splashes or flows to the inner and outer rings of the bearing for cooling and lubrication.

[0004] To achieve the above objectives, this application provides the following technical solution: An oil-cooled motor, comprising: A motor shaft, which passes through the rotor; The motor end cover has a shaft receiving cavity for accommodating the end of the motor shaft, a bearing mounting part is provided in the shaft receiving cavity, and an end cover oil supply channel is also provided on the motor end cover, which is connected to the cooling lubricating oil inlet. A bearing is sleeved on the end of the motor shaft and installed at the bearing mounting part; The lubricating oil storage section is disposed within the shaft housing cavity and communicates with the oil supply channel of the end cover. The lubricating oil storage section is located on the side of the bearing away from the rotor. The cooling lubricating oil in the lubricating oil storage section can be sprayed out along the axial direction of the motor shaft to the bearing.

[0005] Optionally, the oil-cooled motor further includes an oil injection ring. A first step and a second step are provided on the inner sidewall of the shaft receiving cavity. The first step forms the bearing mounting part, and the second step forms the oil injection ring mounting part. The oil injection ring is disposed on the second step and together with the second step forms the lubricating oil storage part.

[0006] Optionally, the oil injection ring is interference-fitted with the second step, or the oil injection ring is bonded to the second step with adhesive.

[0007] Optionally, the oil injection ring includes a first annular portion, a second annular portion, and a connecting portion. The first annular portion and the second annular portion are arranged in parallel. The connecting portion connects the inner ring of the first annular portion and the inner ring of the second annular portion. A U-shaped oil reservoir is formed between the first annular portion, the second annular portion, and the connecting portion. The first annular portion is attached to the step surface of the second step, and the outer edges of the first annular portion and the second annular portion abut against the side wall of the second step.

[0008] Optionally, the second annular portion is closer to the bearing than the first annular portion, and oil injection holes are evenly distributed on the second annular portion. The oil injection holes are connected to the oil reservoir and are located at positions opposite to the rolling elements of the bearing.

[0009] Optionally, the connecting portion is flush with the inner edge of the annular step surface of the second step.

[0010] Optionally, the outer diameter of the oil injection ring is smaller than the inner diameter of the outer ring of the bearing, and the inner diameter of the oil injection ring is larger than the outer diameter of the inner ring of the bearing.

[0011] Optionally, there is an axial gap between the oil injection ring and the bearing.

[0012] Optionally, the end cap oil supply channel is arranged radially along the motor end cap, and the end cap oil supply channel is located above the motor shaft.

[0013] Optionally, the oil-cooled motor further includes: a motor housing and a stator winding disposed within the motor housing, wherein the motor housing is provided with a housing oil inlet and a housing oil delivery channel communicating with the housing oil inlet, and the housing oil delivery channel communicating with the end cover oil delivery channel; The motor housing is also provided with a housing oil outlet hole that communicates with the housing oil supply channel, so that cooling lubricating oil can be sprayed from the housing oil outlet hole to the gap between the motor housing and the stator winding; The motor end cover is also provided with an end cover oil inlet, which is sequentially connected to the cavity inside the motor shaft, the receiving cavity between the rotor and the rotor pressure plate, and the pressure plate oil spray port on the rotor pressure plate. Cooling and lubricating oil can be sprayed from the pressure plate oil spray port to the gap between the stator winding, the rotor, and the motor end cover.

[0014] The oil-cooled motor provided in this application provides an oil supply channel on the motor end cover, through which oil is supplied to the lubricating oil storage part located in the end cover shaft cavity, and oil is supplied axially from the side of the bearing away from the rotor. In this way, the oil can be more easily sprayed onto the end face of the bearing, especially the rolling elements of the bearing. Through the rotation and obstruction of the rolling elements, the oil splashes or flows to the inner and outer rings of the bearing for cooling and lubrication. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a structural diagram of the motor in this application.

[0017] Figure 2 This is the motor oil circuit diagram for this application.

[0018] Figure 3 This is a cross-sectional view of the motor end cover with an oil injection ring installed according to this application.

[0019] Figure 4 This is a schematic diagram of the fuel injection ring of this application.

[0020] exist Figures 1-4 middle: 1. Motor housing; 11. Housing oil inlet; 12. Housing oil supply channel; 2. Motor end cover; 21. End cover oil supply channel; 22. Bearing mounting part; 23. Oil injection ring mounting part; 24. End cover oil inlet; 3. Oil injection ring; 31. First annular part; 32. Second annular part; 321. Oil injection hole; 33. Connecting part; 34. Oil reservoir; 4. Stator winding; 5. Rotor; 51. Rotor pressure plate; 511. Pressure plate radial oil passage; 512. Pressure plate oil injection port; 6. Motor shaft; 61. Axial oil passage; 62. Motor shaft radial oil passage; 7. Bearing. Detailed Implementation

[0021] This application provides an oil-cooled motor. By providing an oil supply channel on the motor end cover, oil is supplied to the lubricating oil storage part located in the shaft housing cavity of the end cover through the oil supply channel. Oil is also sprayed axially from the side of the bearing away from the rotor through the shaft housing cavity. In this way, the oil can be more easily sprayed to the end face of the bearing, especially the rolling elements of the bearing. Through the rotation and obstruction of the rolling elements, the oil splashes or flows to the inner and outer rings of the bearing for cooling and lubrication.

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] like Figures 1-4 As shown, this application provides an oil-cooled motor, comprising: Motor shaft 6, which passes through the rotor 5; The motor end cover 2 is provided with a shaft receiving cavity for accommodating the end of the motor shaft 6. A bearing mounting part 22 is provided inside the shaft receiving cavity. The motor end cover 2 is also provided with an end cover oil supply channel 21, which is connected to the cooling lubricating oil inlet. Bearing 7 is sleeved on the end of motor shaft 6 and installed at bearing mounting part 22; The lubricating oil storage section is located inside the shaft housing cavity and communicates with the end cover oil supply channel 21. The lubricating oil storage section is located on the side of the bearing 7 away from the rotor 5. The cooling lubricating oil in the lubricating oil storage section can be sprayed out along the axial direction of the motor shaft 6 to the bearing 7.

[0024] This application provides an oil supply channel 21 on the motor end cover 2, and supplies oil to the lubricating oil storage section located in the shaft housing cavity of the end cover through the oil supply channel 21. The lubricating oil storage section sprays oil axially from the side of the bearing 7 away from the rotor 5 towards the bearing 7. In this way, the oil can be sprayed more easily to the end face of the bearing 7, especially the rolling elements of the bearing 7. Through the rotation and obstruction of the rolling elements, the oil splashes or flows to the inner and outer rings of the bearing 7 for cooling and lubrication.

[0025] In a preferred embodiment, such as Figures 1-4 As shown, the oil-cooled motor also includes an oil injection ring 3. A first step and a second step are provided on the inner wall of the shaft housing cavity. The first step forms the bearing mounting portion 22, and the second step forms the oil injection ring mounting portion 23. The oil injection ring 3 is disposed on the second step and together with the second step forms a lubricating oil storage portion. In this way, the bearing mounting portion 22 and the oil injection ring mounting portion 23 each utilize a separate step, thus avoiding mutual interference.

[0026] In a preferred embodiment, the fuel injection ring 3 is interference-fitted with the second step, or the fuel injection ring 3 is adhesively connected to the second step. The fuel injection ring 3 is fixed to the motor end cover 2 by interference fit or adhesive connection to prevent the fuel injection ring 3 from falling off the motor end cover 2 due to motor vibration.

[0027] In a preferred embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the oil injection ring 3 includes a first annular portion 31, a second annular portion 32, and a connecting portion 33. The first annular portion 31 and the second annular portion 32 are arranged in parallel. The connecting portion 33 connects the inner rings of the first annular portion 31 and the second annular portion 32. A U-shaped oil reservoir 34 is formed between the first annular portion 31, the second annular portion 32, and the connecting portion 33. The first annular portion 31 is attached to the step surface of the second step, and the outer edges of the first annular portion 31 and the second annular portion 32 abut against the side wall of the second step. The first annular portion 31, the second annular portion 32, the connecting portion 33, and the side wall of the second step together form a lubricating oil storage section. The end cap oil delivery channel 21 corresponds to the opening of the U-shaped oil reservoir 34 and is connected to the lubricating oil storage section. Cooling lubricating oil can be delivered from the end cap oil delivery channel 21 to the lubricating oil storage section. The U-shaped oil reservoir 34 and the side wall of the second step form a closed annular cavity, which is a lubricating oil storage part and can also serve as a pressure stabilizing cavity, which is beneficial to the uniform distribution of the oil injection holes 321 on the oil injection ring 3.

[0028] In a preferred embodiment, such as Figure 1 As shown, the second annular portion 32 is closer to the bearing 7 than the first annular portion 31. Oil injection holes 321 are evenly distributed on the second annular portion 32. The oil injection holes 321 are connected to the oil reservoir 34. The oil injection holes 321 are located at positions opposite to the rolling elements of the bearing 7.

[0029] Under the pressure inside the lubricating oil reservoir, the cooling lubricating oil is sprayed out from the oil spray hole 321. Since the oil spray hole 321 is directly facing the rolling element of the bearing 7, the oil can be directly sprayed onto the rolling element. Through the rotation and obstruction of the rolling element, the oil splashes or flows to the inner and outer walls of the bearing 7 for cooling and lubrication.

[0030] In a preferred embodiment, such as Figure 3 As shown, the connecting part 33 is flush with the inner edge of the annular step surface of the second step, which can keep the oil injection ring 3 and the motor shaft 6 at a sufficient radial distance and avoid interference between the oil injection ring 3 and the motor shaft 6.

[0031] In a preferred embodiment, such as Figure 1 As shown, the outer diameter of the oil injection ring 3 is smaller than the inner diameter of the outer ring of the bearing 7, and the inner diameter of the oil injection ring 3 is larger than the outer diameter of the inner ring of the bearing 7. In this way, the oil injection ring 3 is radially aligned with the rolling elements of the bearing 7, without occupying too much space in the motor end cover 2, and can accurately correspond to the rolling elements of the bearing 7.

[0032] In a preferred embodiment, such as Figure 1As shown, there is an axial gap between the oil injection ring 3 and the bearing 7. This allows the oil to flow out through the axial gap between the oil injection ring 3 and the bearing 7 after the oil injection holes 321 of the oil injection ring 3 spray oil onto the end face of the bearing 7, especially the rolling elements, preventing excessive oil accumulation inside the bearing 7 and thus avoiding localized overheating. Furthermore, the close proximity of the oil injection ring 3 and the bearing 7 shortens the oil injection distance, enabling precise oil injection and facilitating cooling.

[0033] In a preferred embodiment, such as Figure 1 As shown, the end cap oil supply channel 21 is arranged radially along the motor end cap 2, and the end cap oil supply channel 21 is located above the motor shaft 6. In this way, the oil can flow downward from the upper end of the end cap oil supply channel 21 into the U-shaped oil reservoir 34 of the injection ring 3 due to its own gravity, without the need to apply additional pressure to pump the oil.

[0034] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the oil-cooled motor also includes: a motor housing 1 and a stator winding 4 disposed in the motor housing 1. The motor housing 1 is provided with a housing oil inlet 11 and a housing oil delivery channel 12 communicating with the housing oil inlet 11. The housing oil delivery channel 12 is disposed at the top of the motor housing 1 and communicates with the end cover oil delivery channel 21, so that the oil can flow into the end cover oil delivery channel 21 by its own weight. The motor housing 1 is also provided with a housing oil outlet hole that communicates with the housing oil supply channel 12. Cooling lubricating oil can be sprayed from the housing oil outlet hole to the gap between the motor housing 1 and the stator winding 4, thereby cooling the electronic winding. The motor end cover 2 includes a front end cover and a rear end cover. The front end cover and the rear end cover are respectively provided with a bearing 7 and an oil injection ring 3. The front end cover and / or the rear end cover are also provided with an end cover oil inlet 24. The end cover oil inlet 24 is sequentially connected to the axial oil passage 61 in the motor shaft 6, the motor shaft radial oil passage 62 in the motor shaft 6, the pressure plate radial oil passage 511 between the rotor 5 and the rotor pressure plate 51, and the pressure plate oil injection port 512 on the rotor pressure plate 51. Cooling lubricating oil can be sprayed from the pressure plate oil injection port 512 to the gap between the stator winding 4, the rotor 5 and the motor end cover 2, thereby cooling the gap between the stator winding 4, the rotor 5 and the motor end cover 2. The oil-cooled motor of this application uses the above three cooling oil circuits to fully cool the internal structure of the entire motor.

[0035] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0036] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0037] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.

[0038] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0039] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0040] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An oil-cooled motor, characterized in that, include: Motor shaft (6), which passes through the rotor (5); The motor end cover (2) is provided with a shaft receiving cavity for accommodating the end of the motor shaft (6), and a bearing mounting part (22) is provided in the shaft receiving cavity. The motor end cover (2) is also provided with an end cover oil supply channel (21), which is connected to the cooling lubricating oil inlet. The bearing (7) is sleeved on the end of the motor shaft (6) and installed at the bearing mounting part (22); The lubricating oil storage section is located in the shaft housing cavity and communicates with the end cover oil supply channel (21). The lubricating oil storage section is located on the side of the bearing (7) away from the rotor (5). The cooling lubricating oil in the lubricating oil storage section can be sprayed out along the axial direction of the motor shaft (6) to the bearing (7).

2. The oil-cooled motor according to claim 1, characterized in that, The oil-cooled motor also includes an oil injection ring (3). The inner wall of the shaft housing cavity is provided with a first step and a second step. The first step forms the bearing mounting part (22), and the second step forms the oil injection ring mounting part (23). The oil injection ring (3) is disposed on the second step and together with the second step forms the lubricating oil storage part.

3. The oil-cooled motor according to claim 2, characterized in that, The oil injection ring (3) is interference-fitted with the second step, or the oil injection ring (3) is glued to the second step.

4. The oil-cooled motor according to claim 2, characterized in that, The oil injection ring (3) includes a first annular portion (31), a second annular portion (32), and a connecting portion (33). The first annular portion (31) and the second annular portion (32) are arranged in parallel. The connecting portion (33) is connected between the inner ring of the first annular portion (31) and the inner ring of the second annular portion (32). A U-shaped oil reservoir (34) is formed between the first annular portion (31), the second annular portion (32), and the connecting portion (33). The first annular portion (31) is attached to the step surface of the second step. The outer edges of the first annular portion (31) and the second annular portion (32) abut against the side wall of the second step.

5. The oil-cooled motor according to claim 4, characterized in that, The second annular portion (32) is closer to the bearing (7) than the first annular portion (31). Oil injection holes (321) are evenly distributed on the second annular portion (32). The oil injection holes (321) are connected to the oil reservoir (34). The oil injection holes (321) are located at positions opposite to the rolling elements of the bearing (7).

6. The oil-cooled motor according to claim 4, characterized in that, The connecting part (33) is flush with the inner edge of the annular step surface of the second step.

7. The oil-cooled motor according to claim 2, characterized in that, The outer diameter of the oil injection ring (3) is smaller than the inner diameter of the outer ring of the bearing (7), and the inner diameter of the oil injection ring (3) is larger than the outer diameter of the inner ring of the bearing (7).

8. The oil-cooled motor according to claim 2, characterized in that, There is an axial gap between the oil injection ring (3) and the bearing (7).

9. The oil-cooled motor according to claim 1, characterized in that, The end cap oil supply channel (21) is arranged radially along the motor end cap (2), and the end cap oil supply channel (21) is located above the motor shaft (6).

10. The oil-cooled motor according to claim 1, characterized in that, The oil-cooled motor further includes: a motor housing (1) and a stator winding (4) disposed in the motor housing (1). The motor housing (1) is provided with a housing oil inlet (11) and a housing oil delivery channel (12) communicating with the housing oil inlet (11). The housing oil delivery channel (12) is connected to the end cover oil delivery channel (21). The motor housing (1) is also provided with a housing oil outlet hole that communicates with the housing oil supply channel (12), and the cooling lubricating oil can be sprayed from the housing oil outlet hole to the gap between the motor housing (1) and the stator winding (4); The motor end cover is also provided with an end cover oil inlet (24), which is connected in sequence to the axial oil passage (61) in the motor shaft (6), the motor shaft radial oil passage (62) in the motor shaft (6), the pressure plate radial oil passage (511) between the rotor (5) and the rotor pressure plate (51), and the pressure plate spray nozzle (512) on the rotor pressure plate (51). Cooling lubricating oil can be sprayed from the pressure plate spray nozzle (512) to the gap between the stator winding (4), the rotor (5) and the motor end cover (2).

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