Cooling and lubricating structure for motor shaft of hybrid box

Abstract

The utility model discloses a cooling and lubricating structure for a motor shaft of a hybrid power box. The cooling and lubricating structure comprises a motor main shaft, an intermediate shaft, a rotor iron core, a stator iron core, a stator winding, a first cover plate and a second cover plate, wherein the rotor iron core is connected to the motor main shaft, the stator iron core is arranged on the outer side of the rotor iron core, the stator winding is connected to the stator iron core, and the first cover plate is connected with the motor main shaft and located on one side of the rotor iron core. A first cooling channel is arranged between the first cover plate and the rotor iron core, the second cover plate is connected with the motor main shaft and is located at the other side of the rotor iron core, a second cooling channel is arranged between the second cover plate and the rotor iron core, and the intermediate shaft is installed in the motor main shaft. According to the utility model, oil can be sprayed onto the stator winding, so that the stator winding can be quickly cooled, and the cooling effect on the stator winding is further improved.

Description

Technical Field

[0001] The utility model relates to a cooling and lubricating structure for a motor shaft of a hybrid box. Background Art

[0002] At present, the hybrid transmission is a hybrid powertrain that highly integrates components such as motors, engines and transmissions, and is mostly used in hybrid models. When the motor in the hybrid transmission is running under high torque peak conditions, a large amount of heat will be generated, so the motor needs to be cooled in time through a cooling structure, and the stator winding is one of the main heat-generating components in the motor, so it is particularly important to directly cool the stator winding. A Chinese patent with publication number CN218670575U discloses a cooling and lubrication structure for the transmission input shaft and the motor rotor. In this patent, the rotor can only be cooled by oil, but the oil cannot be sprayed onto the stator winding to cool the stator winding, which is not conducive to quickly reducing the temperature of the stator winding. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a hybrid box motor shaft cooling and lubrication structure, which can spray oil onto the stator winding, thereby quickly cooling the stator winding and improving the cooling effect of the stator winding.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a hybrid box motor shaft cooling and lubrication structure, which includes a motor main shaft, an intermediate shaft, a rotor core, a stator core, a stator winding, a first cover plate and a second cover plate;

[0005] The rotor core is connected to the motor main shaft;

[0006] The stator core is arranged outside the rotor core;

[0007] The stator winding is connected to the stator core;

[0008] The first cover plate is connected to the motor main shaft and is located on one side of the rotor core, and a first cooling channel is provided between the first cover plate and the rotor core;

[0009] The second cover plate is connected to the motor main shaft and is located on the other side of the rotor core, and a second cooling channel is provided between the second cover plate and the rotor core;

[0010] The intermediate shaft is installed in the motor main shaft, and a first oil collecting chamber and a second oil collecting chamber are provided between the intermediate shaft and the motor main shaft;

[0011] The intermediate shaft is provided with an oil inlet passage for receiving oil;

[0012] The intermediate shaft is provided with a first through hole for connecting the oil inlet passage and the first oil collecting chamber, and a second through hole for connecting the oil inlet passage and the second oil collecting chamber;

[0013] The motor main shaft is provided with a first oil guide hole for connecting the first oil collecting chamber and the first cooling channel, and a second oil guide hole for connecting the second oil collecting chamber and the second cooling channel;

[0014] A first oil spray hole is provided in the first cover plate, the first oil spray hole is communicated with the first cooling channel and is aligned with one end of the stator winding;

[0015] A second oil spray hole is provided in the second cover plate. The second oil spray hole is communicated with the second cooling channel and is aligned with the other end of the stator winding.

[0016] Further, two first partition plates and two second partition plates are connected to the outer wall of the intermediate shaft;

[0017] The outer periphery of the first partition plate is matched with the motor main shaft, and the first oil collecting chamber is located between the two first partition plates;

[0018] The outer periphery of the second partition plate is matched with the motor main shaft, and the second oil collecting chamber is located between two of the second partition plates.

[0019] Furthermore, at least two of the first through holes are evenly distributed in the circumferential direction of the intermediate shaft;

[0020] There are at least two second through holes evenly distributed in the circumferential direction of the intermediate shaft;

[0021] There are at least two first oil guide holes evenly distributed in the circumferential direction of the motor main shaft, the first cooling channels correspond to the first oil guide holes one by one and are communicated with the corresponding first oil guide holes, and the first oil injection holes correspond to the first cooling channels one by one and are communicated with the corresponding first cooling channels;

[0022] There are at least two second oil guide holes evenly distributed in the circumferential direction of the motor main shaft, the second cooling channels correspond one-to-one to the second oil guide holes and are connected to the corresponding second oil guide holes, and the second oil injection holes correspond one-to-one to the second cooling channels and are connected to the corresponding second cooling channels.

[0023] Furthermore, the hybrid box motor shaft cooling and lubrication structure also includes a motor input shaft, a housing, a front bearing, a middle bearing and a rear bearing;

[0024] The front end of the motor main shaft is rotatably connected to the housing through the front bearing;

[0025] The rear end of the motor main shaft is rotatably connected to the housing through the middle bearing;

[0026] The front end of the motor input shaft is connected to the rear end of the motor main shaft;

[0027] The rear end portion of the motor input shaft is rotatably connected to the housing via the rear bearing.

[0028] Furthermore, the hybrid box motor shaft cooling and lubrication structure further includes an oil guide component, and the oil guide component includes a disc portion and a tube portion;

[0029] The disc portion is connected to the housing, and an oil chamber is provided between the disc portion and the housing;

[0030] The disc portion is provided with at least one lubrication hole communicating with the oil chamber and aligned with the front bearing;

[0031] One end of the tube portion is connected to the disk portion, and the other end of the tube portion extends into the oil inlet passage in the intermediate shaft;

[0032] The pipe portion is provided with a connecting hole for connecting the oil chamber and the oil inlet channel.

[0033] Furthermore, a third oil collecting chamber is provided between the intermediate shaft and the motor main shaft;

[0034] The intermediate shaft is provided with a third through hole for connecting the oil inlet passage and the third oil collecting chamber;

[0035] The motor main shaft is provided with a third oil guide hole connected with the third oil collecting chamber. The third oil guide hole is aligned with the middle bearing and is used to spray the oil in the third oil collecting chamber toward the middle bearing.

[0036] Furthermore, two third oil guide holes are provided, the two third oil guide holes are 180° apart in the circumferential direction of the motor main shaft, and the included angle of the central axes of the two third oil guide holes is 75° to 85°.

[0037] Furthermore, two first through holes are evenly distributed in the circumferential direction of the intermediate shaft, and the diameter of the first through holes is 1.8 mm;

[0038] Two second through holes are evenly distributed in the circumferential direction of the intermediate shaft, and the diameter of the second through hole is 2 mm;

[0039] There are two third through holes evenly distributed in the circumferential direction of the intermediate shaft, and the diameter of the third through holes is 1.5 mm;

[0040] There are two first oil guide holes evenly distributed in the circumferential direction of the motor main shaft, and the diameter of the first oil guide hole is 2.5 mm;

[0041] There are two second oil guide holes evenly distributed in the circumferential direction of the motor main shaft, and the diameter of the second oil guide hole is 2.5 mm;

[0042] The diameter of the third oil guide hole is 2 mm.

[0043] Furthermore, an oil outlet channel is provided in the motor input shaft, and the rear end of the intermediate shaft extends into the oil outlet channel;

[0044] An oil baffle portion is provided at the rear end of the intermediate shaft, and a fourth through hole for connecting the oil inlet channel and the oil outlet channel is provided in the oil baffle portion;

[0045] A lubrication cavity is provided in the housing, the rear bearing is installed in the lubrication cavity, and the oil outlet channel is also communicated with the lubrication cavity.

[0046] Furthermore, the front end of the motor input shaft is connected to the rear end of the motor main shaft through a spline.

[0047] After adopting the above technical solution, after the oil flows into the oil inlet channel, it will flow into the first oil collecting chamber through the first through hole and fill up the first oil collecting chamber, and will also flow into the second oil collecting chamber through the second through hole and fill up the second oil collecting chamber. Then the oil in the first oil collecting chamber flows through the first oil guide hole, the first cooling channel and the first oil spray hole and then sprays onto one end of the stator winding, and the oil in the second oil collecting chamber flows through the second oil guide hole, the second cooling channel and the second oil spray hole and then sprays onto the other end of the stator winding, thereby taking away the heat on the stator winding, directly, effectively and quickly cooling down the stator winding, improving the cooling effect of the stator winding, and avoiding overheating of the stator winding and affecting the service life. Among them, due to the provision of the first oil collecting chamber and the second oil collecting chamber, the oil will flow through the first oil guide hole, the first cooling channel and the first oil spray hole to be sprayed onto the stator winding only after it is gathered in the first oil collecting chamber. Similarly, the oil will flow through the second oil guide hole, the second cooling channel and the second oil spray hole to be sprayed onto the stator winding only after it is gathered in the second oil collecting chamber. It has been confirmed by computer simulation that by providing the intermediate shaft and providing the first oil collecting chamber and the second oil collecting chamber between the intermediate shaft and the motor main shaft, the problem of serious uneven oil injection amount sprayed to the two ends of the stator winding due to the flow inertia of the oil in the oil inlet channel can be solved, and the oil injection amount sprayed on the two ends of the stator winding can be more evenly distributed. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a structural schematic diagram of the hybrid box motor shaft cooling and lubrication structure of the utility model;

[0049] Figure 2for Figure 1 Partial detail of point A in the middle;

[0050] Figure 3 for Figure 1 Partial detail of point B in the middle;

[0051] Figure 4 It is a structural schematic diagram of the intermediate shaft of the utility model;

[0052] Figure 5 It is a structural schematic diagram of the motor main shaft of the utility model;

[0053] Figure 6 It is a structural schematic diagram of the oil guide component of the utility model. DETAILED DESCRIPTION

[0054] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0055] like Figures 1 to 5 As shown, a hybrid box motor shaft cooling and lubrication structure includes a motor main shaft 1, an intermediate shaft 2, a rotor core 3, a stator core 4, a stator winding 5, a first cover plate 6 and a second cover plate 7;

[0056] The rotor core 3 is connected to the motor main shaft 1, and magnetic steel is connected to the rotor core 3;

[0057] The stator core 4 is arranged outside the rotor core 3;

[0058] The stator winding 5 is connected to the stator core 4;

[0059] The first cover plate 6 is connected to the motor main shaft 1 and is located on one side of the rotor core 3. A first cooling channel 8 is provided between the first cover plate 6 and the rotor core 3.

[0060] The second cover plate 7 is connected to the motor main shaft 1 and is located at the other side of the rotor core 3. A second cooling channel 9 is provided between the second cover plate 7 and the rotor core 3.

[0061] The intermediate shaft 2 is installed in the motor main shaft 1, and a first oil collecting chamber 10 and a second oil collecting chamber 11 are provided between the intermediate shaft 2 and the motor main shaft 1;

[0062] The intermediate shaft 2 is provided with an oil inlet passage 12 for receiving oil;

[0063] The intermediate shaft 2 is provided with a first through hole 13 for connecting the oil inlet passage 12 and the first oil collecting chamber 10 and a second through hole 14 for connecting the oil inlet passage 12 and the second oil collecting chamber 11;

[0064] The motor main shaft 1 is provided with a first oil guide hole 15 for connecting the first oil collecting chamber 10 and the first cooling channel 8 and a second oil guide hole 16 for connecting the second oil collecting chamber 11 and the second cooling channel 9;

[0065] A first oil spray hole 17 is provided in the first cover plate 6, and the first oil spray hole 17 is connected to the first cooling channel 8 and is aligned with one end of the stator winding 5;

[0066] The second cover plate 7 is provided with a second oil spray hole 18, which is connected to the second cooling channel 9 and aligned with the other end of the stator winding 5. Specifically, after the oil flows into the oil inlet channel 12, it will flow into the first oil collecting chamber 10 through the first through hole 13 and fill the first oil collecting chamber 10, and will also flow into the second oil collecting chamber 11 through the second through hole 14 and fill the second oil collecting chamber 11. Then, the oil in the first oil collecting chamber 10 flows through the first oil guide hole 15, the first cooling channel 8 and the first oil spray hole 17 and then sprays onto one end of the stator winding 5, and the oil in the second oil collecting chamber 11 flows through the second oil guide hole 16, the second cooling channel 9 and the second oil spray hole 18 and then sprays onto the other end of the stator winding 5, thereby taking away the heat on the stator winding 5, directly, effectively and quickly cooling the stator winding 5, improving the cooling effect of the stator winding 5, and avoiding the stator winding 5 from overheating and affecting the service life.

[0067] To be more specific, due to the provision of the first oil collecting chamber 10 and the second oil collecting chamber 11, the oil will flow through the first oil guide hole 15, the first cooling channel 8 and the first oil spray hole 17 to be sprayed onto the stator winding 5 only after it is gathered in the first oil collecting chamber 10. Similarly, the oil will flow through the second oil guide hole 16, the second cooling channel 9 and the second oil spray hole 18 to be sprayed onto the stator winding 5 only after it is gathered in the second oil collecting chamber 11. Computer simulation has confirmed that by providing the intermediate shaft 2 and providing the first oil collecting chamber 10 and the second oil collecting chamber 11 between the intermediate shaft 2 and the motor main shaft 1, the problem of serious unevenness in the amount of oil sprayed to the two ends of the stator winding 5 due to the flow inertia of the oil in the oil inlet channel 12 can be solved, and the amount of oil sprayed to the two ends of the stator winding 5 can be more evenly distributed.

[0068] like Figures 1 to 5 As shown, two first partition plates 19 and two second partition plates 20 may be connected to the outer wall of the intermediate shaft 2;

[0069] The outer periphery of the first partition plate 19 is matched with the motor main shaft 1, and the first oil collecting chamber 10 is located between the two first partition plates 19;

[0070] The outer periphery of the second partition plate 20 is matched with the motor main shaft 1 , and the second oil collecting chamber 11 is located between two second partition plates 20 .

[0071] Specifically, at least two of the first through holes 13 may be evenly distributed in the circumferential direction of the intermediate shaft 2;

[0072] There may be at least two second through holes 14 evenly distributed in the circumferential direction of the intermediate shaft 2;

[0073] At least two of the first oil guide holes 15 may be evenly distributed in the circumferential direction of the motor main shaft 1, the first cooling channels 8 correspond one-to-one to the first oil guide holes 15 and are connected to the corresponding first oil guide holes 15, and the first oil injection holes 17 correspond one-to-one to the first cooling channels 8 and are connected to the corresponding first cooling channels 8;

[0074] At least two second oil guide holes 16 may be evenly distributed in the circumferential direction of the motor main shaft 1 , the second cooling channels 9 correspond one-to-one to the second oil guide holes 16 and are connected to the corresponding second oil guide holes 16 , and the second oil injection holes 18 correspond one-to-one to the second cooling channels 9 and are connected to the corresponding second cooling channels 9 .

[0075] like Figures 1 to 3 As shown, the hybrid box motor shaft cooling and lubrication structure may also include a motor input shaft 21, a housing, a front bearing 22, a middle bearing 23 and a rear bearing 24;

[0076] The front end of the motor main shaft 1 is rotatably connected to the housing through the front bearing 22;

[0077] The rear end of the motor main shaft 1 is rotatably connected to the housing through the middle bearing 23;

[0078] The front end of the motor input shaft 21 is connected to the rear end of the motor main shaft 1;

[0079] The rear end of the motor input shaft 21 is rotatably connected to the housing via the rear bearing 24 .

[0080] like Figure 1 , 2 As shown in 6, the hybrid box motor shaft cooling and lubrication structure may further include an oil guide component, and the oil guide component includes a disc portion 25 and a tube portion 26;

[0081] The disk portion 25 is connected to the housing, and an oil chamber 27 is provided between the disk portion 25 and the housing;

[0082] The disc portion 25 is provided with at least one lubrication hole 28 which is in communication with the oil chamber 27 and aligned with the front bearing 22, so that the oil in the oil chamber 27 passes through the lubrication hole 28 and is sprayed onto the front bearing 22 for lubrication;

[0083] One end of the tube portion 26 is connected to the disk portion 25, and the other end of the tube portion 26 extends into the oil inlet passage 12 in the intermediate shaft 2;

[0084] The tube portion 26 is provided with a connecting hole 29 for connecting the oil chamber 27 and the oil inlet channel 12, so that the oil in the oil chamber 27 passes through the connecting hole 29 and is sprayed into the oil inlet channel 12; in this embodiment, there are two lubrication holes 28 evenly distributed along the circumference, and the two lubrication holes 28 are arranged 180° apart in the circumference of the disc portion 25. The diameter of the lubrication hole 28 is 1 mm, and the diameter of the connecting hole 29 is 3.5 mm.

[0085] like Figure 1 , 3 As shown in , 4 and 5, a third oil collecting chamber 30 is further provided between the intermediate shaft 2 and the motor main shaft 1;

[0086] The intermediate shaft 2 is provided with a third through hole 31 for connecting the oil inlet passage 12 and the third oil collecting chamber 30;

[0087] The motor main shaft 1 is provided with a third oil guide hole 32 connected to the third oil collecting chamber 30 . The third oil guide hole 32 is aligned with the middle bearing 23 and is used to spray the oil in the third oil collecting chamber 30 toward the middle bearing 23 so as to lubricate the middle bearing 23 .

[0088] Specifically, two third oil guide holes 32 may be provided, and the two third oil guide holes 32 are 180° apart in the circumferential direction of the motor main shaft 1, and the central axis angle of the two third oil guide holes 32 may be 75° to 85°; in the present embodiment, the central axis angle of the two third oil guide holes 32 is preferably 80°.

[0089] In the present embodiment, two first through holes 13 are evenly distributed in the circumferential direction of the intermediate shaft 2, and the diameter of the first through holes 13 is 1.8 mm; two second through holes 14 are evenly distributed in the circumferential direction of the intermediate shaft 2, and the diameter of the second through holes 14 is 2 mm; two third through holes 31 are evenly distributed in the circumferential direction of the intermediate shaft 2, and the diameter of the third through holes 31 is 1.5 mm; two first oil guide holes 15 are evenly distributed in the circumferential direction of the motor main shaft 1, and the diameter of the first oil guide holes 15 is 2.5 mm; two second oil guide holes 16 are evenly distributed in the circumferential direction of the motor main shaft 1, and the diameter of the second oil guide holes 16 is 2.5 mm; the diameter of the third oil guide hole 32 is 2 mm; in the present embodiment, the amount of oil sprayed to the two ends of the stator winding 5 and the amount of oil sprayed to the front bearing 22, the middle bearing 23 and the rear bearing 24 can be more evenly distributed.

[0090] like Figure 1 , 3 As shown in FIG. 4 , an oil outlet passage 33 is provided in the motor input shaft 21, and the rear end of the intermediate shaft 2 extends into the oil outlet passage 33;

[0091] An oil baffle portion 34 is provided at the rear end of the intermediate shaft 2, and a fourth through hole 35 for connecting the oil inlet channel 12 and the oil outlet channel 33 is provided in the oil baffle portion 34;

[0092] The housing is provided with a lubrication cavity 36, the rear bearing 24 is installed in the lubrication cavity 36, and the oil outlet channel 33 is also connected to the lubrication cavity 36; specifically, the oil in the oil inlet channel 12 can flow into the oil outlet channel 33 after passing through the fourth through hole 35, and then flow into the lubrication cavity 36 to lubricate the rear bearing 24; wherein the oil baffle portion 34 can play a certain blocking role on the oil in the oil inlet channel 12, thereby preventing the oil in the oil inlet channel 12 from flowing out of the oil outlet channel 33. In this embodiment, the rear end of the motor input shaft 21 is also connected to a locking bolt, and a discharge hole is provided in the locking bolt, and the oil outlet channel 33 is connected to the lubrication cavity 36 through the discharge hole.

[0093] In this embodiment, the oil baffle 34 and the fourth through hole 35 are provided to allow the oil to be subjected to a flow resistance of appropriate size when flowing from the oil inlet channel 12 into the oil outlet channel 33, so that the oil will not flow too much into the oil outlet channel 33, nor will the oil fail to flow into the oil outlet channel 33. Therefore, when the amount of oil in the system is small, the oil can flow smoothly into the output channel, and then the oil flows into the lubrication cavity 36 to lubricate the rear bearing 24. The diameter of the fourth through hole 35 is 2 mm.

[0094] In this embodiment, not only the cooling demand for the stator winding 5 is taken into consideration, but also the lubrication demand for the front bearing 22, the middle bearing 23 and the rear bearing 24 is met, thereby greatly improving the service life of the hybrid transmission.

[0095] In this embodiment, the front end of the motor input shaft 21 is connected to the rear end of the motor main shaft 1 through a spline.

[0096] Specifically, the housing includes a front housing 37, a middle housing and a rear housing 38, one end of the middle housing is connected to the front housing 37, and the other end of the middle housing is connected to the rear housing 38. The front end of the motor main shaft 1 is rotatably connected to the front housing 37 through the front bearing 22, the rear end of the motor main shaft 1 is rotatably connected to the middle housing through the middle bearing 23, and the rear end of the motor input shaft 21 is rotatably connected to the rear housing 38 through the rear bearing 24. The disc 25 in the oil guide component is connected to the front housing 37 by interference fit, the oil chamber 27 is provided between the disc 25 and the front housing 37, and the lubrication chamber 36 is provided in the rear housing 38.

[0097] In summary, after the oil flows into the oil inlet channel 12, it will flow into the first oil collecting chamber 10 through the first through hole 13 and fill up the first oil collecting chamber 10, and will flow into the second oil collecting chamber 11 through the second through hole 14 and fill up the second oil collecting chamber 11. Then, the oil in the first oil collecting chamber 10 flows through the first oil guide hole 15, the first cooling channel 8 and the first oil spray hole 17 and then sprays onto one end of the stator winding 5, and the oil in the second oil collecting chamber 11 flows through the second oil guide hole 16, the second cooling channel 9 and the second oil spray hole 18 and then sprays onto the other end of the stator winding 5, thereby taking away the heat from the stator winding 5, directly, effectively and quickly cooling the stator winding 5, improving the cooling effect of the stator winding 5, and avoiding overheating of the stator winding 5 and affecting the service life. Among them, due to the provision of the first oil collecting chamber 10 and the second oil collecting chamber 11, the oil will flow through the first oil guide hole 15, the first cooling channel 8 and the first oil spray hole 17 to be sprayed onto the stator winding 5 only after it is gathered in the first oil collecting chamber 10. Similarly, the oil will flow through the second oil guide hole 16, the second cooling channel 9 and the second oil spray hole 18 to be sprayed onto the stator winding 5 only after it is gathered in the second oil collecting chamber 11. It has been confirmed by computer simulation that by providing the intermediate shaft 2 and providing the first oil collecting chamber 10 and the second oil collecting chamber 11 between the intermediate shaft 2 and the motor main shaft 1, the problem of serious unevenness in the amount of oil sprayed to the two ends of the stator winding 5 due to the flow inertia of the oil in the oil inlet channel 12 can be solved, and the amount of oil sprayed on the two ends of the stator winding 5 can be more evenly distributed.

[0098] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid box motor shaft cooling and lubrication structure, characterized in that: It comprises a motor main shaft (1), an intermediate shaft (2), a rotor iron core (3), a stator iron core (4), a stator winding (5), a first cover plate (6) and a second cover plate (7); The rotor core (3) is connected to the motor main shaft (1); The stator iron core (4) is arranged on the outside of the rotor iron core (3); The stator winding (5) is connected to the stator core (4); The first cover plate (6) is connected to the motor main shaft (1) and is located on one side of the rotor core (3); a first cooling channel (8) is provided between the first cover plate (6) and the rotor core (3); The second cover plate (7) is connected to the motor main shaft (1) and is located on the other side of the rotor core (3); a second cooling channel (9) is provided between the second cover plate (7) and the rotor core (3); The intermediate shaft (2) is installed in the motor main shaft (1), and a first oil collecting chamber (10) and a second oil collecting chamber (11) are provided between the intermediate shaft (2) and the motor main shaft (1); The intermediate shaft (2) is provided with an oil inlet passage (12) for receiving oil; The intermediate shaft (2) is provided with a first through hole (13) for connecting the oil inlet passage (12) and the first oil collecting chamber (10), and a second through hole (14) for connecting the oil inlet passage (12) and the second oil collecting chamber (11); The motor main shaft (1) is provided with a first oil guide hole (15) for connecting the first oil collecting chamber (10) and the first cooling channel (8), and a second oil guide hole (16) for connecting the second oil collecting chamber (11) and the second cooling channel (9); A first oil spray hole (17) is provided in the first cover plate (6), the first oil spray hole (17) being in communication with the first cooling channel (8) and aligned with one end of the stator winding (5); A second oil spray hole (18) is provided in the second cover plate (7), and the second oil spray hole (18) is connected to the second cooling channel (9) and is aligned with the other end of the stator winding (5).

2. The hybrid box motor shaft cooling and lubrication structure according to claim 1, characterized in that: Two first partition plates (19) and two second partition plates (20) are connected to the outer wall of the intermediate shaft (2); The outer periphery of the first partition plate (19) cooperates with the motor main shaft (1), and the first oil collecting chamber (10) is located between the two first partition plates (19); The outer periphery of the second partition plate (20) cooperates with the motor main shaft (1), and the second oil collecting chamber (11) is located between two of the second partition plates (20).

3. The hybrid box motor shaft cooling and lubrication structure according to claim 1, characterized in that: At least two of the first through holes (13) are evenly distributed in the circumferential direction of the intermediate shaft (2); At least two of the second through holes (14) are evenly distributed in the circumferential direction of the intermediate shaft (2); At least two of the first oil guide holes (15) are evenly distributed in the circumferential direction of the motor main shaft (1); the first cooling channels (8) correspond one-to-one to the first oil guide holes (15) and are in communication with the corresponding first oil guide holes (15); and the first oil injection holes (17) correspond one-to-one to the first cooling channels (8) and are in communication with the corresponding first cooling channels (8); At least two second oil guide holes (16) are evenly distributed in the circumferential direction of the motor main shaft (1); the second cooling channels (9) correspond one-to-one to the second oil guide holes (16) and are in communication with the corresponding second oil guide holes (16); and the second oil injection holes (18) correspond one-to-one to the second cooling channels (9) and are in communication with the corresponding second cooling channels (9).

4. The hybrid box motor shaft cooling and lubrication structure according to claim 1, characterized in that: It also includes a motor input shaft (21), a housing, a front bearing (22), a middle bearing (23) and a rear bearing (24); The front end of the motor main shaft (1) is rotatably connected to the housing via the front bearing (22); The rear end of the motor main shaft (1) is rotatably connected to the housing via the middle bearing (23); The front end of the motor input shaft (21) is connected to the rear end of the motor main shaft (1); The rear end of the motor input shaft (21) is rotatably connected to the housing via the rear bearing (24).

5. The hybrid box motor shaft cooling and lubrication structure according to claim 4, characterized in that: It also includes an oil guide component, wherein the oil guide component includes a disc portion (25) and a tube portion (26); The disk portion (25) is connected to the housing, and an oil chamber (27) is provided between the disk portion (25) and the housing; The disc portion (25) is provided with at least one lubrication hole (28) which is in communication with the oil chamber (27) and aligned with the front bearing (22); One end of the tube portion (26) is connected to the disk portion (25), and the other end of the tube portion (26) extends into the oil inlet passage (12) in the intermediate shaft (2); The pipe portion (26) is provided with a connecting hole (29) for connecting the oil chamber (27) and the oil inlet passage (12).

6. The hybrid box motor shaft cooling and lubrication structure according to claim 4, characterized in that: A third oil collecting chamber (30) is also provided between the intermediate shaft (2) and the motor main shaft (1); The intermediate shaft (2) is provided with a third through hole (31) for connecting the oil inlet passage (12) and the third oil collecting chamber (30); The motor main shaft (1) is provided with a third oil guide hole (32) connected to the third oil collecting chamber (30); the third oil guide hole (32) is aligned with the middle bearing (23) and is used to spray the oil in the third oil collecting chamber (30) toward the middle bearing (23).

7. The hybrid box motor shaft cooling and lubrication structure according to claim 6, characterized in that: Two third oil guide holes (32) are provided, and the two third oil guide holes (32) are 180° apart in the circumferential direction of the motor main shaft (1), and the included angle between the central axes of the two third oil guide holes (32) is 75° to 85°.

8. The hybrid box motor shaft cooling and lubrication structure according to claim 6, characterized in that: Two first through holes (13) are evenly distributed in the circumferential direction of the intermediate shaft (2), and the diameter of the first through holes (13) is 1.8 mm; Two second through holes (14) are evenly distributed in the circumferential direction of the intermediate shaft (2), and the diameter of the second through holes (14) is 2 mm; Two third through holes (31) are evenly distributed in the circumferential direction of the intermediate shaft (2), and the diameter of the third through holes (31) is 1.5 mm; Two first oil guide holes (15) are evenly distributed in the circumferential direction of the motor main shaft (1), and the diameter of the first oil guide hole (15) is 2.5 mm; Two second oil guide holes (16) are evenly distributed in the circumferential direction of the motor main shaft (1), and the diameter of the second oil guide hole (16) is 2.5 mm; The diameter of the third oil guide hole (32) is 2 mm.

9. The hybrid box motor shaft cooling and lubrication structure according to claim 4, characterized in that: An oil outlet passage (33) is provided in the motor input shaft (21), and the rear end of the intermediate shaft (2) extends into the oil outlet passage (33); An oil baffle portion (34) is provided at the rear end portion of the intermediate shaft (2), and a fourth through hole (35) for connecting the oil inlet passage (12) and the oil outlet passage (33) is provided in the oil baffle portion (34); A lubrication cavity (36) is provided in the housing, the rear bearing (24) is installed in the lubrication cavity (36), and the oil outlet channel (33) is also connected to the lubrication cavity (36).

10. The hybrid box motor shaft cooling and lubrication structure according to claim 4, characterized in that: The front end of the motor input shaft (21) is connected to the rear end of the motor main shaft (1) via a spline.

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