Hollow shaft, rotor structure, motor and electric vehicle

Abstract

The present invention provides a hollow shaft, a rotor structure, a motor and an electric vehicle, wherein the hollow shaft includes a shaft body, the shaft body is provided with a shaft cavity with one end open; the shaft body is also provided with at least one first end oil-slinging port and at least one second end oil-slinging port; a sleeve member, the sleeve member is arranged in the shaft cavity, and an oil-separating port is arranged on the sleeve member, the outer diameter of the sleeve member is R2, and the inner diameter of the shaft cavity is R1, wherein R1>R2; the oil-separating port is arranged between at least one first end oil-slinging port and at least one second end oil-slinging port. The flow distribution of the front and rear end oil-slinging ports of the present invention is uniform, which reduces the cooling temperature difference between the front and rear ends of the hollow shaft; multiple independent oil guide structures increase the axial flow velocity of the cooling oil and improve the oil-passing capacity of the hollow shaft. The semi-enclosed hollow shaft sealing structure prevents leakage of the cooling oil and prevents the pressure difference between the inner cavity air pressure and the outside of the oil-slinging port from forming a pressure difference. The rotor baffle is provided with a cooling channel with multiple layers of sub-channels, which improves the cooling effect of the rotor body.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a hollow shaft, a rotor structure, a motor and an electric car. Background Art

[0002] The electric motor of an electric vehicle generates a lot of heat during low-speed and high-torque operation, which increases the motor temperature and seriously affects the motor's performance and efficiency. For high-speed passenger car motors, high-speed and high-power performance is required in a very limited form factor, which poses new challenges to the heat dissipation of the motor.

[0003] Due to the narrow air gap between the permanent magnet motor rotor and stator, the air in the air gap has difficulty flowing axially, making it difficult to cool the rotor, which will cause serious heating problems. This will cause the magnetic steel material on the rotor to lose magnetism under long-term high temperatures, reducing the output efficiency of the motor. Therefore, in permanent magnet motors, especially high-power density permanent magnet motors, the heating problem on the rotor needs to be considered, and the cooling structure design of the rotor is also extremely important.

[0004] In the prior art, most rotor cooling methods use a hollow shaft structure, where cooling oil is introduced into the hollow shaft and the cooling oil is thrown out by the centrifugal force of the rotor to cool the rotor. However, the oil throwing outlets at both ends of the hollow shaft have uneven flow distribution, which affects the cooling effect and causes a large temperature difference between the front and rear ends. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is that the flow distribution of the hollow shaft oil-slinging port is uneven, which affects the cooling effect, thereby providing a hollow shaft, a rotor structure, a motor and an electric car.

[0006] In order to solve the above problems, the present invention provides a hollow shaft, comprising:

[0007] The shaft body is provided with a shaft cavity with one end open; the shaft body is also provided with at least one first end oil throwing port and at least one second end oil throwing port;

[0008] The sleeve member is arranged in the shaft cavity, and an oil distribution port is arranged on the sleeve member. The outer diameter of the sleeve member is R2, and the inner diameter of the shaft cavity is R1, wherein R1>R2;

[0009] The oil separation port is arranged between at least one first end oil throwing port and at least one second end oil throwing port.

[0010] Preferably, along the axial direction of the shaft body, the distance from the oil separation port to at least one first-end oil-swinging port is L1, and the distance from the oil separation port to at least one second-end oil-swinging port is L2, wherein L1=L2.

[0011] Preferably, a sleeve cavity is provided in the sleeve member, and an oil inlet is provided at an opening end of the sleeve cavity corresponding to the shaft cavity.

[0012] Preferably, the axial depth of the shaft cavity is D1, and the axial length of the sleeve is D2, wherein D1=D2.

[0013] Preferably, an oil guiding structure is provided between the sleeve member and the shaft cavity, the oil guiding structure extending along the axial direction of the hollow shaft, and the oil guiding structure is used to limit the circumferential flow of oil along the inner wall of the shaft cavity, so that the oil flows along the axial direction.

[0014] Preferably, the outer wall of the sleeve is provided with a rib structure extending axially, which divides the annular cavity between the outer wall of the sleeve and the inner wall of the shaft cavity into a plurality of fan-shaped oil guide structures, and the oil separation port, at least one first end oil throwing port, and at least one second end oil throwing port are arranged in the same oil guide structure.

[0015] Preferably, when the annular cavity between the outer wall of the sleeve and the inner wall of the shaft cavity is divided into a plurality of oil guide structures, the number of the oil distribution ports is the same as the number of the oil guide structures, and the plurality of oil distribution ports are circumferentially arranged on the sleeve.

[0016] Preferably, the inner wall of the shaft cavity is provided with a rib groove extending in the axial direction, and the rib groove cooperates with the rib structure.

[0017] Preferably, the inner wall of the shaft cavity is provided with a first fixing structure, the outer wall of the sleeve member is provided with a second fixing structure, and the first fixing structure cooperates with the second fixing structure to fix the sleeve member in the shaft cavity.

[0018] Preferably, the first end oil-fling port includes a baffle oil-fling port and a bearing oil-fling port, and the number of the baffle oil-fling ports is greater than the bearing oil-fling ports, and / or the second end oil-fling port includes a baffle oil-fling port and a bearing oil-fling port, and the number of the baffle oil-fling ports is greater than the bearing oil-fling ports.

[0019] Preferably, the sleeve member is provided with an oil inlet, a sealing groove is provided at the oil inlet, and a sealing ring is provided in the sealing groove.

[0020] Preferably, the sealing ring is provided with an oil pipe hole, the inner diameter of the oil pipe hole is R4, and the inner diameter of the casing cavity is R3, wherein R3>R4;

[0021] and / or,

[0022] An oil pipe hole is arranged on the sealing ring, an oil inlet pipe is arranged in the oil pipe hole, the outer diameter of the oil inlet pipe is R5, and the inner diameter of the oil pipe hole is R4, wherein R4>R5.

[0023] A rotor structure using a hollow shaft includes a rotor baffle, which is arranged on the axial end surface of a rotor body. A cooling channel is arranged in the rotor baffle, and the cooling channel includes at least two sub-channels. Both of the at least two sub-channels can cool the rotor body.

[0024] Preferably, the rotor baffle is also provided with a stator oil-swinging port, which is communicated with the cooling flow channel and is used to throw oil toward the stator structure of the motor.

[0025] A motor adopts the hollow shaft or the rotor structure mentioned above.

[0026] An electric vehicle adopts the hollow shaft or the rotor structure.

[0027] The hollow shaft, rotor structure, motor and electric vehicle provided by the present invention have at least the following beneficial effects:

[0028] 1. The present invention adds a sleeve member in the inner cavity of the hollow shaft to ensure uniform flow distribution of the oil-throwing ports at the front and rear ends, thereby reducing the cooling temperature difference between the front and rear ends of the hollow shaft;

[0029] 2. The sleeve member of the present invention is provided with a plurality of independent oil guide structures outside to control the circumferential dispersion of the cooling oil, increase the axial flow velocity of the cooling oil, improve the oil passing capacity of the hollow shaft, and improve the cooling effect of the rotor structure.

[0030] 3. The present invention adopts a semi-enclosed hollow shaft sealing structure, which can prevent the cooling oil from leaking along the inner wall of the casing cavity when the rotor rotates at high speed. At the same time, it can also maintain the connectivity between the casing cavity and the outside world, preventing the formation of a pressure difference between the inner cavity air pressure and the outside of the oil outlet, resulting in failure to spray oil.

[0031] 4. The rotor baffle of the present invention is provided with a cooling flow channel with multiple layers of sub-flow channels, which increases the contact area and flow path between the cooling oil and the rotor body, and improves the cooling effect of the rotor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a hollow shaft according to an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a sleeve member according to an embodiment of the present invention;

[0034] Figure 3 An axial view of an end portion of a shaft body according to an embodiment of the present invention;

[0035] Figure 4 for Figure 1 The enlarged view of point A in the middle;

[0036] Figure 5 A schematic diagram of the structure of a rotor baffle according to an embodiment of the present invention;

[0037] Figure 6 is a cross-sectional schematic diagram of a rotor baffle according to an embodiment of the present invention;

[0038] Figure 7 is a cross-sectional view of a rotor structure according to an embodiment of the present invention;

[0039] Figure 8 It is a three-dimensional diagram of the rotor structure of an embodiment of the present invention.

[0040] The reference numerals are:

[0041] 1. Hollow shaft; 2. Shaft body; 3. Shaft cavity; 4. First end oil-swinging port; 41. First end baffle oil-swinging port; 42. First end bearing oil-swinging port; 5. Second end oil-swinging port; 51. Second end baffle oil-swinging port; 52. Second end bearing oil-swinging port; 6. Sleeve member; 7. Oil distribution port; 8. Sleeve cavity; 9. Oil inlet; 10. Oil guide structure; 11. Rib structure; 12. Rib groove; 13. Sealing groove; 14. Sealing ring; 15. Oil pipe hole; 16. Oil inlet pipe; 17. Weight reduction part; 18. Rotor baffle; 19. Rotor body; 20. Cooling channel; 21. Stator oil-swinging port; 22. Sub-channel; 23. Oil trough; 24. Channel oil inlet; 25. Oil collecting cavity. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Combination Figures 1 to 8 As shown, a hollow shaft 1 disclosed in an embodiment of the present invention comprises: a shaft body 2, the shaft body 2 is provided with a shaft cavity 3 with one end open; the shaft body 2 is also provided with at least one first-end oil-swinging port 4 and at least one second-end oil-swinging port 5; a sleeve member 6, the sleeve member 6 is arranged in the shaft cavity 3, and an oil separation port 7 is provided on the sleeve member 6, the outer diameter of the sleeve member 6 is R2, and the inner diameter of the shaft cavity 3 is R1, wherein R1>R2; the oil separation port 7 is arranged between at least one first-end oil-swinging port 4 and at least one second-end oil-swinging port 5.

[0044] The hollow shaft 1 provided in the embodiment of the present invention is suitable for a rotor structure in which cooling oil is introduced into the shaft and the cooling oil is thrown out by the centrifugal force of the rotor, thereby cooling the rotor. In the hollow shaft in the prior art, the cooling oil enters from the oil inlet at one end, and the cooling oil first passes through the first group of oil throwing ports during the axial flow process, and a large amount of oil is thrown out in the first group of oil throwing ports. The amount of cooling oil reaching the second group of oil throwing ports is much smaller than that of the first group of oil throwing ports, resulting in uneven distribution of the oil output of the front and rear oil throwing ports, resulting in a large temperature difference between the front and rear cooling parts, affecting the performance of the motor. The hollow shaft 1 of this embodiment is provided with a sleeve member 6 in the shaft cavity 3. The cooling oil first flows along the sleeve member 6 until the flow path reaches a position between the first end oil-throwing port 4 and the second end oil-throwing port 5. Then the cooling oil flows into the shaft cavity 3 through the oil separation port 7. The cooling oil is naturally divided into two streams and flows to the two groups of oil-throwing ports respectively. The amount of cooling oil reaching the two groups of oil-throwing ports is equal, thereby achieving the same level of cooling of the cooling parts at the two ends, reducing the temperature difference at the two ends, and ensuring the rotation performance of the rotor.

[0045] Preferably, in order to make the amount of cooling oil sprayed out of the two groups of oil-slinging ports equal, along the axial direction of the shaft body 2, the distance from the oil separation port 7 to at least one first-end oil-slinging port 4 is L1, and the distance from the oil separation port 7 to at least one second-end oil-slinging port 5 is L2, wherein L1=L2, and the oil separation port 7 is set at the midpoint of the line connecting the first-end oil-slinging port 4 and the second-end oil-slinging port 5, so that the cooling oil flowing out of the oil separation port 7 has the same travel distance to reach the two oil-slinging ports, thereby ensuring that the oil output from the two oil-slinging ports is equal.

[0046] Preferably, the shaft cavity 3 of this embodiment has an axial depth of D1, and the sleeve member 6 has an axial length of D2, wherein D1 = D2. Thus, the sleeve member 6 completely divides the shaft cavity 3 into two layers, the inner sleeve cavity 8, and the outer annular cavity. At this time, the oil distribution port 7 is opened on the tube wall of the middle section of the sleeve member 6, and the oil sprayed from the oil distribution port 7 flows radially, which can better ensure balanced distribution during liquid separation.

[0047] When the hollow shaft 1 rotates at high speed, the cooling oil will first disperse and flow along the wall surface in a circumferential direction, which correspondingly reduces the axial flow speed, resulting in a decrease in the amount of oil sprayed from the oil-slinging port, thereby affecting the cooling effect. To solve this problem, in this embodiment, an oil guide structure 10 is provided between the sleeve member 6 and the shaft cavity 3. The oil guide structure 10 extends along the axial direction of the hollow shaft 1. The function of the oil guide structure 10 is to reduce the flow space of the oil except for the axial flow, limit the circumferential flow and dispersion of the oil along the inner wall of the shaft cavity 3, make the cooling oil flow along the axial direction, and ensure that the amount of oil flowing to the oil-slinging port is sufficient.

[0048] Preferably, this embodiment provides a preferred scheme for an oil guide structure 10, the outer wall of the sleeve member 6 is provided with a rib structure 11 extending in the axial direction, the rib structure 11 divides the annular cavity between the outer wall of the sleeve member 6 and the inner wall of the shaft cavity 3 into a plurality of fan-shaped oil guide structures 10, the oil separation port 7, at least one first-end oil throwing port 4, and at least one second-end oil throwing port 5 are arranged in the same oil guide structure 10, and the cooling oil is divided into two streams after being sprayed out from the oil separation port 7, and is respectively transported to the oil throwing port along the fan-shaped long groove oil guide structure 10.

[0049] In this embodiment, the oil guide structure 10 is formed by the ribs protruding from the outer wall of the sleeve member 6 and the inner wall of the shaft cavity 3. It can also be formed by opening an axial groove on the outer wall of the sleeve member 6 or the inner wall of the shaft cavity 3, or directly using a connecting pipe. Both of these can achieve the technical effect of the present invention.

[0050] In this embodiment, each oil distribution port 7 and its corresponding first end oil throwing port 4 and second end oil throwing port 5 on the radial cross section have an independent flow channel, which increases the axial flow capacity of the cooling oil and solves the problem of slow axial speed of the cooling oil caused by circumferential flow.

[0051] Preferably, when the annular cavity between the outer wall of the sleeve member 6 and the inner wall of the shaft cavity 3 is divided into multiple oil guide structures 10, that is, multiple independent axial flow channels are formed, the number of oil distribution ports 7 is the same as the number of oil guide structures 10, and multiple oil distribution ports 7 are opened on the sleeve member 6 along the circumferential direction, and each independent flow channel has an oil distribution port 7, which fully utilizes the space in the shaft cavity 3, increases the circulation area of ​​the cooling oil, and improves the cooling oil delivery capacity.

[0052] Preferably, in order to fix the sleeve member 6 in the shaft cavity 3 , the inner wall of the shaft cavity 3 is provided with a rib groove 12 extending in the axial direction, and the rib groove 12 cooperates with the rib structure 11 to fix the sleeve member 6 to the hollow shaft 1 .

[0053] In another embodiment, without the aid of the rib structure 11, other independent fixing devices can be used to fix the sleeve member 6 and the hollow shaft 1. A first fixing structure can be provided on the inner wall of the shaft cavity 3, and a second fixing structure can be provided on the outer wall of the sleeve member 6. The first fixing structure and the second fixing structure cooperate to fix the sleeve member 6 in the shaft cavity 3.

[0054] Preferably, since the hollow shaft 1 needs to supply oil to the bearing and the baffle at the same time, and the oil supply of the baffle is greater than that of the bearing, after the cooling oil at the baffle cools the rotor body 19, it can also be thrown onto the stator structure with the rotation of the rotor structure to cool the stator structure. The first end oil-slinging port 4 includes a first end baffle oil-slinging port 41 and a second end bearing oil-slinging port 42, and the number of the first end baffle oil-slinging port 41 is greater than the first end bearing oil-slinging port 42, and / or, the second end oil-slinging port 5 includes a second end baffle oil-slinging port 51 and a second end bearing oil-slinging port 52, and the number of the second end baffle oil-slinging port 51 is greater than the second end bearing oil-slinging port 52. During the operation of the motor, most of the cooling oil needs to be allocated to the baffle oil-slinging port and transported to the motor windings, so the number of baffle oil-slinging ports is required to be more than the bearing oil-slinging port, and a larger number of baffle oil-slinging ports are arranged on the circumference of the hollow shaft 1 at a smaller interval angle to ensure that most of the cooling oil is thrown out through the baffle oil-slinging port.

[0055] In the prior art, cooling oil enters the hollow shaft from the oil inlet pipe. Due to process problems, the oil inlet pipe can only be near the oil inlet of the hollow shaft and cannot reach the bottom of the shaft cavity. Therefore, after the cooling oil enters the shaft cavity, under the action of centrifugal force, it will diffuse to both sides along the inner wall of the shaft cavity. A sealing ring is arranged at the oil inlet to seal the cooling oil and prevent the cooling oil from flowing out along the inner wall of the shaft cavity, so that all the cooling oil flows in the direction of the oil throwing port. When the rotor rotates at high speed, the air in the hollow shaft will be thrown out from each oil throwing port, resulting in a decrease in the air pressure in the inner cavity of the hollow shaft, forming a pressure difference with the outside world, and some oil throwing ports will have a backflow phenomenon, resulting in failure to throw the oil normally.

[0056] Preferably, a sleeve cavity 8 is provided in the sleeve member 6 of the present embodiment, and an oil inlet 9 is provided at the end of the opening of the sleeve cavity 8 corresponding to the shaft cavity 3, and a sealing groove 13 is provided at the oil inlet 9. A semi-sealed sealing ring 14 is provided in the sealing groove 13. The sealing ring 14 can prevent leakage of cooling oil from the oil inlet 9 and keep the sleeve cavity 8 connected with the outside world, thereby preventing backflow from the oil throwing port, resulting in failure of normal oil throwing.

[0057] Preferably, in order to prevent leakage of cooling oil from the oil inlet 9, an oil pipe hole 15 is provided on the sealing ring 14, the inner diameter of the oil pipe hole 15 is R4, and the inner diameter of the casing cavity 8 is R3, wherein R3>R4, so that the sealing ring 14 forms a stepped surface at the oil inlet 9, which can prevent the cooling oil from flowing out of the oil inlet 9 and leaking when the rotor rotates at high speed along the inner wall of the casing cavity 8;

[0058] and / or,

[0059] In order to avoid the pressure difference between the inside and outside of the hollow shaft, an oil pipe hole 15 is provided on the sealing ring 14, and an oil inlet pipe 16 is provided in the oil pipe hole 15. The outer diameter of the oil inlet pipe 16 is R5, and the inner diameter of the oil pipe hole 15 is R4, wherein R4>R5. A gap is formed between the oil pipe hole 15 and the oil inlet pipe 16, which can maintain the connectivity between the casing cavity 8 and the outside world, and prevent the air pressure in the inner cavity of the hollow shaft 1 from decreasing when the rotor rotates at high speed, thereby forming a pressure difference with the outside of the oil outlet, resulting in failure of normal oil injection.

[0060] Preferably, the outer wall of the sealing ring 14 is interference fit with the inner wall of the sealing groove 13 , and the sealing ring 14 and the sealing groove 13 are sealed and fixedly connected.

[0061] Preferably, since there is a gap between the oil pipe hole 15 and the oil inlet pipe 16, in order to prevent the cooling oil sprayed into the oil inlet pipe 16 from leaking from the oil pipe hole 15, the end of the oil inlet pipe 16 toward the oil inlet 9 extends into the oil inlet 9 by a length L1, satisfying L1 ≥ 0, thereby ensuring that the cooling oil input into the oil inlet 9 by the oil inlet pipe 16 directly enters the interior of the oil inlet 9.

[0062] Preferably, considering the cost and structural strength, a weight-reducing portion 17 is provided on the sealing ring 14 .

[0063] like Figure 5-8 As shown, this embodiment provides a rotor structure, which adopts the above-mentioned hollow shaft 1.

[0064] Preferably, it includes a rotor baffle 18, which is arranged on the axial end surface of the rotor body 19. A cooling channel 20 is provided in the rotor baffle 18. The cooling channel 20 is connected to the first end oil-throwing port 4 or the second end oil-throwing port 5 of the hollow shaft 1. Specifically, the cooling channel 20 is connected to the first end baffle oil-throwing port 41, or is connected to the second end baffle oil-throwing port 51. The cooling channel 20 can increase the contact area between the cooling oil and the rotor body 19, thereby improving the cooling effect of the rotor body 19.

[0065] Preferably, while the rotor structure is being cooled, the stator structure also needs to be cooled by oil throwing, so the rotor baffle 18 is also provided with a stator oil throwing port 21 for throwing oil onto the motor stator structure to cool the motor stator structure.

[0066] Preferably, in order to realize the oil supply of the stator oil-fling port 21, the stator oil-fling port 21 is connected with the cooling channel 20, and the cooling channel 20 supplies oil, and / or the stator oil-fling port 21 is connected with the first end oil-fling port 4 or the second end oil-fling port 5 of the hollow shaft 1. Specifically, the stator oil-fling port 21 is connected with the first end baffle oil-fling port 41, or is connected with the second end baffle oil-fling port 51, and the stator oil-fling port 21 is directly supplied with oil by the oil-fling port of the hollow shaft 1.

[0067] Preferably, the rotor baffle 18 is installed on the end surface of the rotor body 19 , and its inner side surface is in direct contact with the rotor body 19 . In this case, the cooling channel 20 is a groove structure opened on the end surface of the rotor baffle 18 facing the rotor body 19 .

[0068] Preferably, in order to further increase the contact area between the cooling oil and the rotor body 19, the cooling channel 20 includes at least two sub-channels 22, and at least two sub-channels 22 can cool the rotor body 19. At least two sub-channels 22 are respectively connected to the first end oil-slinging port 4, or at least two sub-channels 22 are respectively connected to the second end oil-slinging port 5, at least two sub-channels 22 can be independently supplied with oil from the oil-slinging port 5, or at least two sub-channels 22 can be connected through at least one oil-passing groove 23, so that the cooling oil flows through at least two sub-channels 22 in sequence.

[0069] Preferably, taking into account the balance of the contact area between the cooling oil and the rotor body and ensuring the cooling consistency of various parts of the rotor body, at least two sub-channels 22 are concentrically arranged annular channels, wherein the sub-channel 22 with the smallest radius is provided with at least one channel oil inlet 24 connected to the baffle shaft hole, and the sub-channel 22 with the largest radius is provided with at least one stator oil-spraying port 21 connected to the outer peripheral wall of the rotor, so that after the cooling oil flows in from the channel oil inlet 24, it traverses all the sub-channels 22 and finally enters the stator oil-spraying port 21.

[0070] Preferably, an oil collecting chamber 25 is further provided in the circumferential edge of the rotor baffle 18. The oil is collected in the oil collecting chamber 25 under the action of centrifugal force. The oil collected in the oil collecting chamber 25 is supplied to the stator oil throwing port 21. The oil collecting chamber 25 can make it easier for the cooling oil to be thrown out from the stator oil throwing port 21.

[0071] The rotor structure provided in this embodiment adopts a rotor baffle structure with multi-layer flow channels, which can increase the contact area and flow path between the cooling oil and the rotor, and improve the cooling effect of the rotor core.

[0072] A motor adopts the hollow shaft 1, and / or the sealing ring 14, and / or the rotor baffle 18, or the rotor structure.

[0073] An electric vehicle adopts the hollow shaft 1, and / or the sealing ring 14, and / or the rotor baffle 18, or the rotor structure.

[0074] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A hollow shaft, It is characterized in that include: A shaft body (2), wherein the shaft body (2) is provided with a shaft cavity (3) with one end open; the shaft body (2) is also provided with at least one first end oil throwing port (4) and at least one second end oil throwing port (5); A sleeve member (6), the sleeve member (6) is arranged in the shaft cavity (3), an oil distribution port (7) is provided on the sleeve member (6), the outer diameter of the sleeve member (6) is R2, the inner diameter of the shaft cavity (3) is R1, wherein R1>R2; The oil separation port (7) is arranged between the at least one first end oil-splitting port (4) and the at least one second end oil-splitting port (5); The sleeve member (6) is provided with a sleeve cavity (8), and an oil inlet (9) is provided at the end of the sleeve cavity (8) corresponding to the opening of the shaft cavity (3); the sleeve member (6) is provided with an oil inlet (9), and a sealing groove (13) is provided at the oil inlet (9), and a sealing ring (14) is provided in the sealing groove (13); The sealing ring (14) is provided with an oil pipe hole (15), the inner diameter of the oil pipe hole (15) is R4, and the inner diameter of the casing cavity (8) is R3, wherein R3>R4; The sealing ring (14) is provided with an oil pipe hole (15), an oil inlet pipe (16) is provided in the oil pipe hole (15), the outer diameter of the oil inlet pipe (16) is R5, and the inner diameter of the oil pipe hole (15) is R4, wherein R4>R5.

2. The hollow shaft according to claim 1, It is characterized in that Along the axial direction of the shaft body (2), the distance from the oil separation port (7) to the at least one first end oil-splitting port (4) is L1, and the distance from the oil separation port (7) to the at least one second end oil-splitting port (5) is L2, wherein L1=L2.

3. The hollow shaft according to claim 1 or 2, It is characterized in that The axial depth of the shaft cavity (3) is D1, and the axial length of the sleeve member (6) is D2, wherein D1=D2.

4. The hollow shaft according to claim 3, It is characterized in that An oil guide structure (10) is provided between the sleeve member (6) and the shaft cavity (3), and the oil guide structure (10) extends along the axial direction of the hollow shaft (1). The oil guide structure (10) is used to limit the circumferential flow of oil along the inner wall of the shaft cavity (3), so that the oil flows along the axial direction.

5. The hollow shaft according to claim 3, It is characterized in that The outer wall of the sleeve member (6) is provided with a rib structure (11) extending in the axial direction, and the rib structure (11) divides the annular cavity between the outer wall of the sleeve member (6) and the inner wall of the shaft cavity (3) into a plurality of fan-shaped oil guide structures (10), and the oil separation port (7), at least one first end oil throwing port (4), and at least one second end oil throwing port (5) are arranged in the same oil guide structure (10).

6. The hollow shaft according to claim 4, It is characterized in that When the annular cavity between the outer wall of the sleeve member (6) and the inner wall of the shaft cavity (3) is divided into a plurality of oil guide structures (10), the number of the oil distribution ports (7) is the same as the number of the oil guide structures (10), and the plurality of oil distribution ports (7) are circumferentially arranged on the sleeve member (6).

7. The hollow shaft according to claim 5, It is characterized in that The inner wall of the shaft cavity (3) is provided with a rib groove (12) extending in the axial direction, and the rib groove (12) cooperates with the rib structure (11).

8. The hollow shaft according to claim 1, It is characterized in that The inner wall of the shaft cavity (3) is provided with a first fixing structure, and the outer wall of the sleeve member (6) is provided with a second fixing structure, and the first fixing structure cooperates with the second fixing structure to fix the sleeve member (6) in the shaft cavity (3).

9. The hollow shaft according to claim 1, It is characterized in that The first end oil-slinging port (4) comprises a baffle oil-slinging port and a bearing oil-slinging port, and the number of the baffle oil-slinging ports of the first end oil-slinging port (4) is greater than the bearing oil-slinging ports of the first end oil-slinging port (4), and / or the second end oil-slinging port (5) comprises a baffle oil-slinging port and a bearing oil-slinging port, and the number of the baffle oil-slinging ports of the second end oil-slinging port (5) is greater than the bearing oil-slinging ports of the second end oil-slinging port (5).

10. A rotor structure using the hollow shaft (1) according to any one of claims 1 to 9, It is characterized in that The invention comprises a rotor baffle (18), wherein the rotor baffle (18) is arranged on the axial end surface of a rotor body (19), wherein a cooling flow channel (20) is arranged in the rotor baffle (18), wherein the cooling flow channel (20) comprises at least two sub-flow channels (22), and the at least two sub-flow channels (22) can both cool the rotor body (19).

11. The rotor structure according to claim 10, It is characterized in that The rotor baffle (18) is also provided with a stator oil-swinging port (21), the stator oil-swinging port (21) is in communication with the cooling flow channel (20), and the stator oil-swinging port (21) is used to throw oil toward the stator structure of the motor.

12. A motor, It is characterized in that A hollow shaft (1) as described in any one of claims 1 to 9, or a rotor structure as described in claim 10 or 11 is used.

13. An electric car, It is characterized in that A hollow shaft (1) as described in any one of claims 1 to 9, or a rotor structure as described in claim 10 or 11 is used.

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