Cooling system for a drive motor and drive motor

Abstract

The present disclosure provides a cooling system for driving motor and driving motor, and belongs to the technical field of electric vehicles. The cooling system comprises a shaft tooth oil injection assembly and a sealing oil ring. The shaft tooth oil injection assembly is located in the motor shell and has a hollow structure. The shaft tooth oil injection assembly has an oil inlet, an oil outlet and a plurality of shaft tooth oil injection holes. Each shaft tooth oil injection hole is arranged one-to-one corresponding to each part of the shaft tooth part to be cooled. The sealing oil ring is located in the motor shell and connected with one end of the stator and rotor part. An annular cavity is formed between the sealing oil ring and the inner wall of the motor shell. The sealing oil ring has a plurality of stator oil injection holes. The stator oil injection holes are in communication with the annular cavity. The annular cavity is in communication with the oil outlet. The present disclosure can improve the cooling effect of the driving motor.

Description

Technical Field

[0001] This disclosure pertains to the field of electric vehicle technology, and particularly relates to a cooling system for a drive motor and the drive motor itself. Background Technology

[0002] Currently, pure electric vehicles are gaining increasing consumer acceptance, and their market share is growing. The mainstream pure electric vehicles on the market generally revolve around three core systems: the motor, the reducer, and the motor control unit, further integrating on-board chargers, high-voltage distribution boxes, DC / DC converters, and other systems as the drive power source. During operation, the drive motor of a pure electric vehicle generates considerable heat, therefore, timely heat dissipation is necessary.

[0003] In related technologies, heat dissipation of drive motors typically employs either water cooling or oil cooling. Oil cooling generally involves arranging pipes containing oil inside the motor housing, with oil spray nozzles on the pipes to spray oil onto the outer wall of the stator for cooling. Similarly, the rotor shaft is designed as a hollow shaft, with oil spray nozzles also on its outer wall. The rotor shaft itself also contains oil, which is sprayed onto the rotor through these nozzles to further reduce its temperature.

[0004] However, cooling the motor using the above methods requires arranging pipes outside the stator, which increases the overall size of the drive motor and makes it difficult to install. Additionally, the need to make the rotor shaft hollow increases the machining precision of the rotor shaft, thus increasing manufacturing costs. Summary of the Invention

[0005] This disclosure provides a cooling system for a drive motor and a drive motor itself, which can improve the cooling effect of the drive motor. The technical solution is as follows:

[0006] This disclosure provides a cooling system for a drive motor. The drive motor includes a motor housing, a gear assembly, and a stator and rotor assembly. The gear assembly is located inside the motor housing and is movably connected to the motor housing. The stator and rotor assembly is located inside the motor housing and is connected to the gear assembly. The cooling system includes a gear oil injection assembly and a sealing oil ring. The gear oil injection assembly is located inside the motor housing and has an oil inlet, an oil outlet, and multiple gear oil injection holes. The multiple gear oil injection holes are respectively connected to the gear assembly. Each component to be cooled is arranged in a corresponding manner. The shaft gear oil injection hole is used to spray the oil input from the oil inlet onto the corresponding component to be cooled in the shaft gear component. The sealing oil ring is located inside the motor housing and is connected to one end of the stator and rotor components. The sealing oil ring forms an annular cavity with the inner wall of the motor housing. The sealing oil ring has multiple stator oil injection holes, which communicate with the annular cavity. The annular cavity communicates with the oil outlet. The stator oil injection holes are used to spray the oil input from the oil outlet into the annular cavity onto the stator and rotor components.

[0007] In another implementation of this disclosure, the sealing oil ring includes a ring body and two outer flanges, the two outer flanges being located at both ends of the ring body and both connected to the ring body, and the stator oil injection hole being located in the ring body; one of the two outer flanges is sealed and engaged with the motor housing, the ring body abuts against one end of the stator and rotor components, and the two outer flanges, the ring body, and the motor housing form the annular cavity.

[0008] In another implementation of this disclosure, there are two sealing oil rings, each located at one end of the axial direction of the stator and rotor components. For each sealing oil ring, the outer flange of the sealing oil ring near the other sealing oil ring has multiple flow grooves, which extend along the axial direction of the sealing oil ring and communicate with the annular cavity. The stator in the stator and rotor components has multiple stator grooves on the outer surface facing the motor housing. The multiple stator grooves correspond one-to-one with the flow grooves on the sealing oil rings, and the two ends of each stator groove communicate with the corresponding flow groove.

[0009] In another implementation of this disclosure, the gear component includes a rotor shaft, a first bearing, a motor shaft, a third bearing, and a fifth bearing. The first bearing is connected to the outside of a first end of the rotor shaft, and the second end of the rotor shaft is used to connect to the stator-rotor component. The motor shaft is driven parallel to and connected to the rotor shaft. The third bearing is connected to the outside of the first end of the motor shaft, and the fifth bearing is connected to the outside of the first end of the output shaft of the drive motor. The output shaft is driven connected to the side of the motor shaft away from the rotor shaft. The gear oil injection assembly includes a first oil guide, which is located at the same end of the rotor shaft and the motor shaft. The first oil guide has a first channel inside, and the first end of the first channel is the oil inlet. A first portion of the gear oil injection hole is located on the first oil guide and communicates with the first channel. The first portion of the gear oil injection hole is arranged corresponding to the rotor shaft, the first bearing, the motor shaft, the third bearing, and the fifth bearing.

[0010] In another implementation of this disclosure, the first part of the shaft gear oil injection hole includes a rotor shaft oil injection hole, a first bearing oil injection hole, a motor shaft oil injection hole, a third bearing oil injection hole, and a fifth bearing oil injection hole; the rotor shaft oil injection hole is aligned axially with the end of the first end of the rotor shaft; the first bearing oil injection hole is aligned axially with the side of the first bearing facing the first oil guide member; the motor shaft oil injection hole is aligned axially with the end of the first end of the motor shaft; the third bearing oil injection hole is aligned axially with the side of the third bearing facing the first oil guide member; and the fifth bearing oil injection hole is aligned axially with the side of the fifth bearing facing the first oil guide member.

[0011] In another implementation of this disclosure, the gear assembly further includes a first gear pair, a fourth bearing, a second gear pair, and a sixth bearing. The first gear pair is connected between the rotor shaft and the motor shaft. The fourth bearing is connected to the outside of the second end of the rotor shaft. The second gear pair is connected between the motor shaft and the output shaft. The sixth bearing is connected to the outside of the second end of the output shaft. The gear oil injection assembly further includes a second oil guide. The second oil guide is located on the same side of the rotor shaft and the motor shaft. The second oil guide has a second channel inside. The first end of the second channel communicates with the second end of the first channel. The second end of the second channel is the oil outlet. The second part of the gear oil injection hole is located on the second oil guide and communicates with the second channel. The second part of the gear oil injection hole is arranged in a one-to-one correspondence with the first gear pair, the fourth bearing, the second gear pair, and the sixth bearing.

[0012] In another implementation of this disclosure, the second part of the gear oil injection hole includes a first gear pair oil injection hole, a second gear pair oil injection hole, a fourth bearing oil injection hole, and a sixth bearing oil injection hole; the first gear pair oil injection hole is aligned with the sidewall of the first gear pair in a direction perpendicular to the axis of the rotor shaft, the second gear pair oil injection hole is aligned with the sidewall of the second gear pair in a direction perpendicular to the axis of the rotor shaft, the fourth bearing oil injection hole is aligned with the sidewall of the fourth bearing in a direction perpendicular to the axis of the rotor shaft, and the sixth bearing oil injection hole is aligned with the sidewall of the sixth bearing in a direction perpendicular to the axis of the rotor shaft.

[0013] In another implementation of this disclosure, the first oil guide is a plate structure, and the second oil guide is a pipe.

[0014] In another implementation of this disclosure, the cooling system further includes an oil pump and an oil collector; the outlet of the oil pump is connected to the oil inlet of the gear injection assembly, the oil pump is located outside the motor housing and connected to the motor housing; the oil collector is located inside the bottom of the motor housing, and the outlet of the oil collector is connected to the inlet of the oil pump.

[0015] In another implementation of this disclosure, a drive motor is also provided, the drive motor including the cooling system described above.

[0016] The beneficial effects of the technical solutions provided in this disclosure are:

[0017] When cooling the drive motor, the cooling system provided in this embodiment includes a gear oil spraying assembly and a sealing oil ring. The gear oil spraying assembly is located inside the motor housing and has multiple gear oil spraying holes. The gear oil spraying holes are used to spray the oil input from the oil inlet onto the corresponding parts to be cooled in the gear assembly. In this way, multiple different parts to be cooled in the gear assembly can be cooled separately through the gear oil spraying holes, avoiding the need to set the rotor shaft as a hollow shaft, thus greatly reducing costs.

[0018] Furthermore, since an annular cavity is formed between the sealing oil ring and the motor housing, and the inner wall of the sealing oil ring has multiple stator oil injection holes, the stator oil injection holes are connected to the annular cavity, and the annular cavity is connected to the oil outlet. In this way, oil can be sprayed onto the ends of the stator and rotor components through the stator oil injection holes to cool the stator and rotor components, avoiding the need to set up pipes outside the stator in related technologies, which would make the drive motor too large.

[0019] As can be seen, the cooling system provided in this embodiment can spray engine oil directly onto the surface of each object to be cooled inside the drive motor. This allows the engine oil to come into direct contact with the object being cooled, greatly improving the cooling effect and enabling the object to be cooled to quickly drop to the target temperature. At the same time, it has the characteristics of low cost and small size. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the drive motor provided in an embodiment of the present disclosure;

[0022] Figure 2 A schematic diagram of the oil flow channel in the cooling system of the drive motor provided in this embodiment of the disclosure;

[0023] Figure 3 This is a schematic diagram of the structure of the sealing oil ring provided in an embodiment of this disclosure;

[0024] Figure 4 This is a schematic diagram of the assembly of the sealing oil ring and the motor housing according to an embodiment of the present disclosure;

[0025] Figure 5 This is a schematic diagram of the structure of the stator assembly provided in an embodiment of the present disclosure;

[0026] Figure 6 This is a simplified schematic diagram of a cooling system provided in an embodiment of the present disclosure.

[0027] The symbols in the diagram represent the following meanings:

[0028] 1. Shaft gear oil injection assembly; 10. Shaft gear oil injection hole; 11. First oil guide; 110. First channel; 1011. Rotor shaft oil injection hole; 1012. First bearing oil injection hole; 1013. Motor shaft oil hole; 1014. Third bearing oil injection hole; 1015. Fifth bearing oil injection hole; 12. Second oil guide; 120. Second channel; 1021. First gear pair oil injection hole; 1022. Second gear pair oil injection hole; 1023. Fourth bearing oil injection hole; 1024. Sixth bearing oil injection hole;

[0029] 3. Sealing oil ring; 31. Ring body; 32. Outer flange; 320. Sealing ring groove; 3201. Flat ring groove; 30. Annular cavity; 301. Stator oil injection hole; 302. Flow groove; 303. Stator groove;

[0030] 5. Oil pump; 6. Oil collector; 7. Oil cooler; 8. Oil filter;

[0031] 100. Motor housing;

[0032] 200. Shaft gear assembly; 201. Rotor shaft; 202. First bearing; 203. Motor shaft; 204. Third bearing; 205. Fifth bearing; 206. First gear pair; 207. Fourth bearing; 208. Second gear pair; 209. Sixth bearing;

[0033] 300. Stator and rotor components. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0035] To clearly illustrate the cooling system for a drive motor provided in this embodiment, the basic structure of the drive motor will be described first.

[0036] Figure 1 This is a schematic diagram of the structure of the drive motor provided in the embodiments of this disclosure, combined with... Figure 1 The drive motor includes a motor housing 100, a shaft gear assembly 200, and a stator and rotor assembly 300. The shaft gear assembly 200 is located inside the motor housing 100 and is movably connected to the motor housing 100. The stator and rotor assembly 300 are located inside the motor housing 100. The stator assembly in the stator and rotor assembly 300 is connected to the motor housing 100, and the rotor assembly in the stator and rotor assembly 300 is connected to the shaft gear assembly 200.

[0037] The shaft and gear component 200 includes a rotor shaft 201, a first bearing 202 and a second bearing supporting both ends of the rotor shaft 201, a motor shaft 203, a third bearing 204 and a fourth bearing 207 supporting both ends of the motor shaft 203, a first gear pair 206 connecting the rotor shaft 201 and the motor shaft 203, an output shaft, a fifth bearing 205 and a sixth bearing 209 supporting both ends of the output shaft, a second gear pair 208 connecting the motor shaft 203 and the output shaft, a rotor assembly connected to the rotor shaft 201, and a stator assembly fitted over the rotor assembly. The stator assembly is connected to the motor housing 100. The motor shaft 203, the rotor shaft 201, and the output shaft are arranged in parallel to each other.

[0038] In the above structure, the motor housing 100 provides a mounting base for other components. The rotor shaft 201 drives the rotor assembly to rotate. The motor shaft 203 rotates with the rotor shaft 201 under the transmission of the first gear pair 206, while the first gear pair 206 ensures that the speed of the motor shaft 203 is less than the speed of the rotor shaft 201. The output shaft connects to the vehicle's wheels to drive them and enable the vehicle to move. The second gear pair 208 connects the output shaft to the motor shaft 203, allowing the output shaft to rotate with the motor shaft 203, while also ensuring that the speed of the output shaft is less than the speed of the motor shaft 203. The first bearing 202 and the second bearing rotatably connect the rotor shaft 201 to the motor housing 100. The third bearing 204 and the fourth bearing 207 rotatably connect the motor shaft 203 to the motor housing 100. The fifth bearing 205 and the sixth bearing 209 rotatably connect the output shaft to the motor housing 100.

[0039] This disclosure provides a cooling system for a drive motor, such as... Figure 2 As shown, the cooling system is used to cool the drive motor. The cooling system includes a gear oil injection assembly 1 and a sealing oil ring 3. The gear oil injection assembly 1 is located inside the motor housing 100. The gear oil injection assembly 1 has an oil inlet, an oil outlet, and multiple gear oil injection holes 10. The multiple gear oil injection holes 10 are arranged one-to-one with each component of the gear assembly 200 to be cooled. The gear oil injection holes 10 are used to spray the oil input from the oil inlet onto the corresponding component of the gear assembly 200 to be cooled. The sealing oil ring 3 is located inside the motor housing 100 and is connected to one end of the stator and rotor assembly 300. An annular cavity 30 is formed between the sealing oil ring 3 and the inner wall of the motor housing 100. The sealing oil ring 3 has multiple stator oil injection holes 301, which communicate with the annular cavity 30. The annular cavity 30 communicates with the oil outlet. The stator oil injection holes 301 are used to spray the oil input from the oil outlet into the annular cavity 30 onto the stator and rotor assembly 300.

[0040] When the cooling system of the drive motor provided in this embodiment cools the drive motor, the cooling system includes a gear oil injection assembly 1 and a sealing oil ring 3. The gear oil injection assembly 1 is located inside the motor housing 100 and has multiple gear oil injection holes 10. The gear oil injection holes 10 are used to spray the oil input from the oil inlet onto the corresponding parts to be cooled in the gear component 200. In this way, multiple different parts to be cooled in the gear component 200 can be cooled through the gear oil injection holes 10, avoiding the need to set the rotor shaft as a hollow shaft, thus greatly reducing costs.

[0041] Furthermore, since an annular cavity 30 is formed between the sealing oil ring 3 and the motor housing 100, and the inner wall of the sealing oil ring 3 has multiple stator oil injection holes 301, the stator oil injection holes 301 are connected to the annular cavity 30, and the annular cavity 30 is connected to the oil outlet, oil can be sprayed onto the stator and rotor components 300 through the stator oil injection holes 301 to cool the stator and rotor components 300, thus avoiding the problem of the drive motor being too large due to the installation of pipes outside the stator in related technologies.

[0042] As can be seen, the cooling system provided in this embodiment can spray engine oil directly onto the surface of each object to be cooled inside the drive motor. This allows the engine oil to come into direct contact with the object being cooled, greatly improving the cooling effect and enabling the object to be cooled to quickly drop to the target temperature. At the same time, it has the characteristics of low cost and small size.

[0043] Figure 3 This is a schematic diagram of the structure of the sealing oil ring provided in the embodiments of this disclosure, combined with... Figure 3 Optionally, the sealing oil ring 3 includes a ring body 31 and two outer flanges 32, which are located at both ends of the ring body 31 and are connected to the ring body 31. The stator oil injection hole 301 is located in the ring body 31.

[0044] One of the two outer flanges 32 is sealed and snapped into the motor housing 100, and the ring body 31 abuts against one end of the stator and rotor components 300. The two outer flanges 32, the ring body 31 and the motor housing 100 form an annular cavity 30.

[0045] In the above implementation, the sealing oil ring 3 is configured with the above structure, so that it can be positioned and snapped together with the motor housing 100 through the outer flange 32. At the same time, it cooperates with the motor housing 100 and together with the ring body 31 to form an annular cavity 30, so that the oil can enter the annular cavity 30 and be sprayed onto the first end of the stator assembly through the stator oil injection hole 301 to cool the stator assembly.

[0046] For example, the sealing oil ring 3 is a plastic part, which facilitates its manufacture and fastening to the motor housing 100.

[0047] Figure 4 This is a schematic diagram of the assembly of the sealing oil ring and the motor housing provided in the embodiments of this disclosure, combined with... Figure 4 To enable quick positioning and installation of the motor housing 100 and the sealing oil ring 3, the inner wall of the motor housing 100 has a limiting groove. One of the two outer flanges 32 of the sealing oil ring 3 is closer to the stator assembly (that is...). Figure 4The outer flange 32 on the right side is located in the limiting groove of the motor housing 100 and fits against the inner wall of the limiting groove. In the sealing oil ring 3, one of the two outer flanges 32 closest to the stator assembly has a flat annular groove 3201, in which a sealing gasket is installed. The sealing gasket contacts the end of the stator assembly.

[0048] The "flat" in the flat annular groove 3201 mentioned above refers to... Figure 4 The cross-sectional shape of the flat annular groove 3201 shown is that the ratio between the length of the flat annular groove 3201 along the axial direction of the rotor shaft and the width of the annular groove along the radial direction of the rotor shaft is greater than 1.

[0049] To improve the sealing performance between the sealing oil ring 3 and the motor housing 100, a sealing ring groove 320 is provided on the outer wall of the outer flange 32 of the two outer flanges 32 in the sealing oil ring 3, the one outer flange 32 furthest from the stator assembly (that is, ... Figure 4 The outer flange 32 on the left side of the motor housing 100 contains a sealing ring, which is installed in the sealing ring groove 320. The sealing ring is in contact with the inner wall of the motor housing 100.

[0050] In this embodiment, to improve the spraying effect of the stator oil spray holes 301 on the stator assembly, the stator oil spray holes 301 are arranged at intervals along the circumference and axial direction of the ring body 31. This allows for spraying and cooling of the outer surface of the circumferential stator assembly.

[0051] Optionally, there are two sealing oil rings 3, which are located at both ends of the motor housing 100 along the axis of the rotor shaft 201.

[0052] See also Figure 2 and Figure 3 For each sealing oil ring 3, there are multiple flow grooves 302 on the outer wall of the outer flange 32 near another sealing oil ring 3. The flow grooves 302 extend along the axial direction of the sealing oil ring 3 and communicate with the annular cavity 30.

[0053] Figure 5 This is a schematic diagram of the structure of the stator assembly provided in the embodiments of this disclosure, combined with... Figure 5 The outer surface of the stator assembly is provided with multiple stator grooves 303, and the multiple stator grooves 303 correspond one-to-one with the flow grooves 302 on each sealing oil ring 3, and the two ends of the stator grooves 303 are respectively connected to the corresponding flow grooves 302.

[0054] In the above implementation, setting two sealing oil rings 3 can further enhance the spraying effect of the stator oil injection hole 301 on the stator assembly.

[0055] Meanwhile, a stator groove 303 is provided on the outer surface of the stator and rotor components 300. This allows the flow grooves 302 arranged in the two sealing oil rings 3 to be connected through the stator groove 303, so that the oil in the annular cavity 30 can flow out from the flow groove 302 on one of the sealing oil rings 3, then flow along the stator groove 303, and enter the annular cavity 30 in the other sealing oil ring 3, so that the oil can be sprayed again into the second end of the stator assembly through the stator oil injection hole 301 in the other sealing oil ring 3.

[0056] As can be seen, the above structure can guide the oil through the stator groove 303, cool the stator assembly, and allow the oil to enter another annular cavity 30 for spraying onto the second end of the stator assembly.

[0057] In other words, the stator groove 303 and the inner wall of the motor housing 100 form a through channel along the axis of the rotor shaft 201. Oil in the first sealing oil ring 3 enters the stator groove 303 through the flow groove 302. Then, the oil enters the annular cavity 30 corresponding to the other sealing oil ring 3. As the oil flows within the stator groove 303, it cools the outer wall of the stator assembly. Simultaneously, the stator oil injection holes 301 in the two sealing oil rings 3 can spray oil to both ends of the stator assembly.

[0058] See you again Figure 2 and Figure 6 Optionally, the gear oil injection assembly 1 includes a first oil guide 11, which is located at the same end of the rotor shaft 201 and the motor shaft 203. The first oil guide 11 has a first channel 110 inside, and the first end of the first channel 110 is an oil inlet. The first part of the gear oil injection hole 10 is located on the first oil guide 11 and communicates with the first channel 110.

[0059] The first part of the shaft tooth oil injection hole 10 is arranged in a one-to-one correspondence with the rotor shaft 201, the first bearing 202, the motor shaft 203, the third bearing 204 and the fifth bearing 205.

[0060] In the above implementation, the shaft gear oil injection assembly 1 is set as the first oil guide 11, so that the first oil guide can form a first channel 110, so that the oil can flow through the first channel 110 to the first part of the shaft gear oil injection hole 10, so that the oil can be sprayed along the first part of the shaft gear oil injection hole 10 to the rotor shaft 201, the first bearing 202, the motor shaft 203, the third bearing 204 and the fifth bearing 205.

[0061] Combination Figure 1Optionally, the first part of the shaft gear oil injection hole 10 includes a rotor shaft oil injection hole 1011, a first bearing oil injection hole 1012, a motor shaft oil hole 1013, a third bearing oil injection hole 1014, and a fifth bearing oil injection hole 1015. The rotor shaft oil injection hole 1011, the first bearing oil injection hole 1012, the motor shaft oil hole 1013, the third bearing oil injection hole 1014, and the fifth bearing oil injection hole 1015 are all located on the outer wall of the first channel 110 and communicate with the interior of the first channel 110.

[0062] The rotor shaft oil injection hole 1011 is aligned axially with the end of the first end of the rotor shaft 201. The first bearing oil injection hole 1012 is aligned axially with the side of the first bearing 202 facing the first oil guide member 11. The motor shaft oil hole 1013 is aligned axially with the end of the first end of the motor shaft 203. The third bearing oil injection hole 1014 is aligned axially with the side of the third bearing 204 facing the first oil guide member 11. The fifth bearing oil injection hole 1015 is aligned axially with the side of the fifth bearing 205 facing the first oil guide member 11.

[0063] In the above implementation, the first part of the shaft gear oil injection hole 10 is configured as the rotor shaft oil injection hole 1011, the first bearing oil injection hole 1012, the motor shaft oil hole 1013, the third bearing oil injection hole 1014, and the fifth bearing oil injection hole 1015. In this way, the rotor shaft 201, the first bearing 202, the motor shaft 203, the third bearing 204, and the fifth bearing 205 in the drive motor can be sprayed in a targeted manner through the above shaft gear oil injection holes, so that the above components can be wetted by the oil and cooled down quickly.

[0064] In this embodiment, to facilitate the arrangement and connection of the gear oil injection assembly 1, the first oil guide 11 is a plate structure, and the first oil guide 11 is integrated with the end of the motor housing 100. The first oil guide 11 is perpendicular to the rotor shaft 201.

[0065] In the above implementation, the first oil guide 11 is set as a plate structure, so that the first oil guide 11 can be directly integrated into the end of the motor housing 100, that is, the first oil guide 11 is a side wall of the motor housing 100, thereby reducing the size of the drive motor. At the same time, the orientation of the first channel 110 can be purposefully designed according to the specific positions of the rotor shaft 201, the first bearing 202, the motor shaft 203, the third bearing 204, and the fifth bearing 205, so that the oil injection holes 1011 on the rotor shaft, 1012 on the first bearing, 1013 on the motor shaft, 1014 on the third bearing, and 1015 on the fifth bearing can be aligned with the spray target in sequence.

[0066] In other words, the arrangement of the first channel 110 can be any structure, as long as the rotor shaft oil injection hole 1011, the first bearing oil injection hole 1012, the motor shaft oil hole 1013, the third bearing oil injection hole 1014, and the fifth bearing oil injection hole 1015 can be aligned with the spray target.

[0067] Optionally, the gear oil injection assembly 1 further includes a second oil guide 12, which is located on the same side of the rotor shaft 201 and the motor shaft 203. The second oil guide 12 has a second channel 120 inside, the first end of which communicates with the second end of the first channel 110, and the second end of the second channel 120 is an oil outlet. The second part of the gear oil injection hole 10 is located on the second oil guide 12 and communicates with the second channel 120. The second part of the gear oil injection hole 10 is arranged in a corresponding manner to the first gear pair 206, the fourth bearing 207, the second gear pair 208, and the sixth bearing 209.

[0068] In the above implementation, the shaft gear oil injection assembly 1 is configured to also include a second oil guide 12, so that a second channel 120 can be formed by the second oil guide 12, so that the oil can flow through the second channel 120 to the second part of the shaft gear oil injection hole 10, so that the oil can be sprayed along the second part of the shaft gear oil injection hole 10 to the first gear pair 206, the fourth bearing 207, the second gear pair 208 and the sixth bearing 209.

[0069] Optionally, the second part of the gear oil injection hole 10 includes a first gear pair oil injection hole 1021, a second gear pair oil injection hole 1022, a fourth bearing oil injection hole 1023, and a sixth bearing oil injection hole 1024. The first gear pair oil injection hole 1021 is aligned with the side wall of the first gear pair 206 in a direction perpendicular to the axis of the rotor shaft 201. The second gear pair oil injection hole 1022 is aligned with the side wall of the second gear pair 208 in a direction perpendicular to the axis of the rotor shaft 201. The fourth bearing oil injection hole 1023 is aligned with the side wall of the fourth bearing 207 in a direction perpendicular to the axis of the rotor shaft 201. The sixth bearing oil injection hole 1024 is aligned with the side wall of the sixth bearing 209 in a direction perpendicular to the axis of the rotor shaft 201.

[0070] In the above implementation, the second channel 120 can introduce oil into the interior of the second oil guide 12, so that the oil can be sprayed out through the first gear pair oil injection hole 1021, the second gear pair oil injection hole 1022, the fourth bearing oil injection hole 1023, and the sixth bearing oil injection hole 1024, with the first gear pair oil injection hole 1021 being the most efficient. This allows for targeted spraying of the oil through these injection holes to the first gear pair 206, the second gear pair 208, the fourth bearing 207, and the sixth bearing 209 within the drive motor, enabling these components to be wetted by the oil and rapidly cooled.

[0071] Optionally, the second oil guide 12 is a pipe fitting.

[0072] In the above implementation, the second oil guide 12 is set as a pipe structure, which allows the second oil guide 12 to be flexibly arranged according to the positions of the first gear pair 206, the second gear pair 208, the fourth bearing 207 and the sixth bearing 209, so that the first gear pair oil injection hole 1021, the second gear pair oil injection hole 1022, the fourth bearing oil injection hole 1023 and the sixth bearing oil injection hole 1024 can be aligned with the spray target in sequence.

[0073] In this embodiment, the second oil guide 12 can be connected to the first oil guide 11 by a threaded connection. That is, the outer wall of the second oil guide 12 is provided with external threads, and the second end of the first channel 110 is provided with internal threads. In this way, the second oil guide 12 can be directly inserted into the first channel 110 of the first oil guide 11 by thread.

[0074] Combination Figure 6 Optionally, the cooling system also includes an oil pump 5 and an oil collector 6. The outlet of the oil pump 5 is connected to the oil inlet of the shaft gear oil injection assembly 1. The oil pump 5 is located outside the motor housing 100 and is connected to the motor housing 100.

[0075] The oil collector 6 is located inside the bottom of the motor housing 100, and the outlet of the oil collector 6 is connected to the inlet of the oil pump 5.

[0076] In the above implementation, the oil pump 5 is used to draw in and pressurize the oil, so that the oil entering the shaft gear oil injection assembly 1 has sufficient pressure to move along the first channel 110, the second channel 120 and the annular cavity 30, and is sprayed out through the shaft gear oil injection hole 10 and the stator oil injection hole 301.

[0077] The oil collector 6 is used to recover the oil that falls into the bottom of the motor housing 100 due to gravity, so that the oil can re-enter the first channel 110, the second channel 120 and the annular cavity 30 for injection circulation.

[0078] In this embodiment, the oil collector 6 is an oil collector 6 with a filter structure, so that the oil recovered by the oil collector 6 can be filtered, so that the recovered oil will not contain impurities.

[0079] Oil pump 5 is an electric motor oil pump. The oil pressure or flow rate at the outlet of oil pump 5 is controlled by the electronic control unit of the electric motor oil pump.

[0080] In addition, in order to further improve the cooling effect of the above cooling system and make the oil have a lower temperature, the cooling system provided in this embodiment of the present disclosure also includes an oil cooler 7. The oil cooler 7 is connected between the oil pump 5 and the shaft gear oil injection assembly 1. The oil inlet of the oil cooler 7 is connected to the oil outlet of the oil pump 5, and the oil outlet of the oil cooler 7 is connected to the oil inlet in the shaft gear oil injection assembly 1.

[0081] This ensures that the oil entering the first channel 110 has a sufficiently low temperature, thereby ensuring that the oil sprayed from the shaft gear oil injection hole 10 and the stator oil injection hole 301 has a sufficiently low temperature.

[0082] In this embodiment, the oil cooler 7 is a water-cooled cooler, and the outer wall of the oil cooler 7 is provided with an inlet and an outlet for cooling water to enter and exit.

[0083] By circulating cooling water in the oil cooler 7, the temperature of the oil entering the oil cooler 7 can be reduced. The temperature of the cooling water in the oil cooler 7 is about 35-40°C lower than the temperature of the oil. Thus, after the oil passes through the oil cooler 7, its own temperature decreases by about 15-20°C.

[0084] In this embodiment, the oil temperature after being pressurized by the oil pump 5 is approximately 100-110°C, and the pressure is approximately 150-200 kPa. After passing through the oil cooler 7, the oil temperature drops to approximately 90°C.

[0085] Similarly, in order to prevent impurities in the oil from clogging the shaft gear oil injection hole 10 and the stator oil injection hole 301, the cooling system provided in this embodiment of the present disclosure also includes an oil filter 8. The oil filter 8 is connected between the oil pump 5 and the oil cooler 7. The oil inlet of the oil filter 8 is connected to the oil outlet of the oil pump 5, and the oil outlet of the oil filter 8 is connected to the oil inlet of the oil cooler 7.

[0086] In this way, the oil pressurized by the oil pump 5 directly enters the oil filter 8 and is filtered by the oil filter 8, which can greatly improve the cleanliness of the oil.

[0087] In this embodiment, in order to ensure that the oil sprayed from the gear oil injection hole 10 and the stator oil injection hole 301 has a sufficient range, both the gear oil injection hole 10 and the stator oil injection hole 301 are small holes of 1-1.5 mm.

[0088] It should be noted that the connection mentioned above refers to the fixed connection of two components through fasteners, while the connection refers to the connection of two components through pipes or joints, so that oil can flow between the two components after the two components are connected.

[0089] On the other hand, embodiments of this disclosure also provide a drive motor, which includes the cooling system described above.

[0090] The drive motors described above have the same beneficial effects as the aforementioned cooling system, which will not be elaborated upon here.

[0091] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A cooling system for a drive motor, characterized in that, The drive motor includes a motor housing (100), a shaft gear component (200), and a stator and rotor component (300). The shaft gear component (200) is located inside the motor housing (100) and is movably connected to the motor housing (100). The stator and rotor component (300) is located inside the motor housing (100) and is connected to the shaft gear component (200). The stator and rotor component (300) is connected to the motor housing (100). The cooling system includes a gear oil injection assembly (1) and a sealing oil ring (3). The gear oil injection assembly (1) is located inside the motor housing (100). The gear oil injection assembly (1) has an oil inlet, an oil outlet and multiple gear oil injection holes (10). The multiple gear oil injection holes (10) are respectively arranged in correspondence with each component to be cooled in the gear component (200). The gear oil injection holes (10) are used to spray the oil input from the oil inlet onto the corresponding component to be cooled in the gear component (200). The sealing oil ring (3) is located inside the motor housing (100) and is connected to one end of the stator and rotor components (300). The sealing oil ring (3) forms an annular cavity (30) between itself and the inner wall of the motor housing (100). The sealing oil ring (3) has a plurality of stator oil injection holes (301). The stator oil injection holes (301) are connected to the annular cavity (30). The annular cavity (30) is connected to the oil outlet. The stator oil injection holes (301) are used to spray the oil that is input into the annular cavity (30) from the oil outlet onto the stator and rotor components (300).

2. The cooling system according to claim 1, characterized in that, The sealing oil ring (3) includes a ring body (31) and two outer flanges (32). The two outer flanges (32) are located at both ends of the ring body (31) and are connected to the ring body (31). The stator oil injection hole (301) is located in the ring body (31). One of the two outer flanges (32) is sealed and engaged with the motor housing (100), and the ring body (31) abuts against one end of the stator and rotor components (300). The two outer flanges (32), the ring body (31), and the motor housing (100) form the annular cavity (30).

3. The cooling system according to claim 2, characterized in that, There are two sealing oil rings (3), and the two sealing oil rings (3) are located at both ends of the axial direction of the stator and rotor components (300); For each of the sealing oil rings (3), the outer flange (32) of the sealing oil ring (3) near the other sealing oil ring (3) has a plurality of flow grooves (302), the flow grooves (302) extend along the axial direction of the sealing oil ring (3), and the flow grooves (302) communicate with the annular cavity (30); The stator in the stator-rotor component (300) has a plurality of stator grooves (303) on the outer surface of the stator facing the motor housing (100). The plurality of stator grooves (303) correspond one-to-one with the flow grooves (302) on the sealing oil ring (3), and the two ends of the stator grooves (303) are respectively connected to the corresponding flow grooves (302).

4. The cooling system according to claim 1, characterized in that, The shaft gear component (200) includes a rotor shaft (201), a first bearing (202), a motor shaft (203), a third bearing (204), and a fifth bearing (205). The first bearing (202) is connected to the outside of the first end of the rotor shaft (201). The second end of the rotor shaft (201) is used to connect with the stator-rotor component (300). The motor shaft (203) is parallel to the rotor shaft (201) and is drivenly connected to the rotor shaft (201). The third bearing (204) is connected to the outside of the first end of the motor shaft (203). The fifth bearing (205) is connected to the outside of the first end of the output shaft of the drive motor. The output shaft is drivenly connected to the side of the motor shaft (203) away from the rotor shaft (201). The gear oil injection assembly (1) includes a first oil guide (11), which is located at the same end of the rotor shaft (201) and the motor shaft (203). The first oil guide (11) has a first channel (110) inside, and the first end of the first channel (110) is the oil inlet. The first part of the gear oil injection hole (10) is located on the first oil guide (11) and communicates with the first channel (110). The first part of the oil injection hole (10) of the shaft tooth is arranged in a one-to-one correspondence with the rotor shaft (201), the first bearing (202), the motor shaft (203), the third bearing (204) and the fifth bearing (205).

5. The cooling system according to claim 4, characterized in that, The first part of the shaft gear oil injection hole (10) includes a rotor shaft oil injection hole (1011), a first bearing oil injection hole (1012), a motor shaft oil hole (1013), a third bearing oil injection hole (1014), and a fifth bearing oil injection hole (1015). The rotor shaft oil injection hole (1011) is aligned axially with the end of the first end of the rotor shaft (201). The first bearing oil injection hole (1012) is aligned axially with the side of the first bearing (202) facing the first oil guide (11). The motor shaft oil hole (1013) is aligned axially with the end of the first end of the motor shaft (203). The third bearing oil injection hole (1014) is aligned axially with the side of the third bearing (204) facing the first oil guide (11). The fifth bearing oil injection hole (1015) is aligned axially with the side of the fifth bearing (205) facing the first oil guide (11).

6. The cooling system according to claim 4, characterized in that, The gear component (200) further includes a first gear pair (206), a fourth bearing (207), a second gear pair (208), and a sixth bearing (209). The first gear pair (206) is connected between the rotor shaft (201) and the motor shaft (203). The fourth bearing (207) is connected to the outside of the second end of the rotor shaft (201). The second gear pair (208) is connected between the motor shaft (203) and the output shaft. The sixth bearing (209) is connected to the outside of the second end of the output shaft. The gear oil injection assembly (1) further includes a second oil guide (12), which is located on the same side of the rotor shaft (201) and the motor shaft (203). The second oil guide (12) has a second channel (120) inside. The first end of the second channel (120) is connected to the second end of the first channel (110). The second end of the second channel (120) is the oil outlet. The second part of the gear oil injection hole (10) is located on the second oil guide (12) and is connected to the second channel (120). The second part of the gear oil injection hole (10) is arranged in a one-to-one correspondence with the first gear pair (206), the fourth bearing (207), the second gear pair (208) and the sixth bearing (209).

7. The cooling system according to claim 6, characterized in that, The second part of the gear oil injection hole (10) includes a first gear pair oil injection hole (1021), a second gear pair oil injection hole (1022), a fourth bearing oil injection hole (1023) and a sixth bearing oil injection hole (1024). The first gear pair injection port (1021) is aligned with the side wall of the first gear pair (206) in a direction perpendicular to the axis of the rotor shaft (201), and the second gear pair injection port (1022) is aligned with the side wall of the second gear pair (208) in a direction perpendicular to the axis of the rotor shaft (201). The fourth bearing oil injection hole (1023) is aligned with the side wall of the fourth bearing (207) in a direction perpendicular to the axis of the rotor shaft (201), and the sixth bearing oil injection hole (1024) is aligned with the side wall of the sixth bearing (209) in a direction perpendicular to the axis of the rotor shaft (201).

8. The cooling system according to claim 6, characterized in that, The first oil guide (11) is a plate structure, and the second oil guide (12) is a pipe.

9. The cooling system according to any one of claims 1-8, characterized in that, The cooling system also includes an oil pump (5) and an oil collector (6). The outlet of the oil pump (5) is connected to the oil inlet of the gear injection assembly (1). The oil pump (5) is located outside the motor housing (100) and connected to the motor housing (100). The oil collector (6) is located inside the bottom of the motor housing (100), and the outlet of the oil collector (6) is connected to the inlet of the oil pump (5).

10. A drive motor, characterized in that, The drive motor includes a cooling system according to any one of claims 1-9.

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