Motor oil cooling rotating shaft structure and oil cooling method

Abstract

The invention belongs to the technical field of motor cooling, and provides a motor oil cooling rotating shaft structure and an oil cooling method.The motor oil cooling rotating shaft structure comprises a first shaft body, a second shaft body and an oil way unit, one end of the first shaft body is provided with an oil filling column in the axial direction, the second shaft body and the first shaft body are integrally welded, a cavity is formed in the second shaft body, and the oil filling column is arranged in the axial direction of the cavity; the connecting rod is connected with the closed end of the cavity; the cavity forms a conical slope surface at a set position, and the set position is located between the open end and the closed end. Cooling liquid in the first shaft body and the second shaft body can reach the set position through the refueling column and then enter the cavity at the set position, the cooling liquid entering the cavity is thrown to the inner wall of the cavity under the action of centrifugal force and thrown out of the oil way formed in the inner wall of the cavity, and due to the fact that the inner wall of the cavity is arranged to be the conical slope, the cooling liquid can be cooled to the set position. Cooling liquid can be guided, and the situation that too much oil is accumulated in the cavity and the dynamic balance of the rotor is affected is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of motor cooling, and in particular relates to a motor oil-cooling shaft structure and an oil cooling method. Background Art

[0002] The hollow shaft of the oil-cooled motor plays a vital role in the cooling system of the motor. The oil inlet of the existing hollow shaft is usually set at the left end of the hollow shaft, while the oil outlet is generally set at the left section and right end of the internal cavity. Therefore, some of the oil outlet holes arranged in the cavity are close to the oil inlet, and some are far away from the oil inlet. This results in a small flow rate at the oil outlet far away from the oil inlet and a large flow rate at the oil outlet close to the oil inlet, resulting in uneven flow distribution; in addition, the existing hollow shaft is prone to excessive internal oil accumulation, affecting the dynamic balance of the rotor itself. Summary of the invention

[0003] In view of the problems raised in the background technology, the present invention provides a motor oil-cooling shaft structure and an oil cooling method.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A motor oil-cooling shaft structure, comprising:

[0006] The first shaft body is provided with a refueling column along the axial direction;

[0007] The second shaft body is integrally connected to the first shaft body and has a cavity disposed therein, wherein one end of the cavity is an open end and the other end is a closed end;

[0008] The refueling column is arranged along the axial direction of the cavity until it is connected to the closed end of the cavity; the inner diameter of the cavity gradually decreases from the open end to the set position, and gradually increases from the set position to the closed end, forming a tapered slope; the set position is located between the open end and the closed end;

[0009] The rotor core is mounted on the surface of the second shaft;

[0010] A first end cover is mounted on one end of the rotor core and is sealed and connected to the surface of the second shaft;

[0011] A second end cover is installed at the other end of the rotor core and is sealed and connected to the surface of the second shaft;

[0012] The oil circuit unit includes a plurality of oil circuits provided in the first shaft body, the second shaft body, the rotor core, the first end cover and the second end cover;

[0013] The oil outlet of at least one oil circuit is located at a set position.

[0014] Preferably, the set position is the symmetry center of the cavity.

[0015] Preferably, the oil circuit unit includes a first oil circuit;

[0016] Along the flow direction of the coolant, the first oil circuit starts from one end of the first shaft body, and is provided with an oil inlet, a first oil inlet channel and a second oil inlet channel which are connected in sequence along the axial direction of the first shaft body;

[0017] And, a third oil inlet passage is provided in the second shaft body and is connected with the second oil inlet passage along the axis line;

[0018] Furthermore, a plurality of keyway lubrication holes communicating with the third oil inlet passage are provided in the second shaft body, and the keyway lubrication holes are arranged obliquely relative to the axis of the second shaft body.

[0019] Preferably, the first oil inlet channel is provided with a plurality of first oil outlets in a radial direction at a set position.

[0020] Preferably, the inner diameter of the oil inlet is larger than the inner diameter of the first oil inlet passage, and the inner diameter of the first oil inlet passage is larger than the inner diameter of the second oil inlet passage.

[0021] Preferably, the oil inlet is provided with a plurality of first bearing lubrication holes in a radial direction, and the first bearing lubrication holes are used to deliver the coolant to the first bearing;

[0022] The first bearing is installed at the end of the first shaft body and is located at the outlet of the first bearing lubrication hole.

[0023] Preferably, the oil circuit unit includes a second oil circuit;

[0024] In the second oil circuit, a plurality of second bearing lubrication holes are provided at the end of the cavity away from the first end cover;

[0025] The second oil circuit is used to transport the coolant through the second bearing lubrication hole starting from the cavity.

[0026] Preferably, a second bearing is installed at the outlet of the second bearing lubrication hole, and the second bearing is installed on the surface of the second shaft body.

[0027] Preferably, the oil circuit unit includes a third oil circuit;

[0028] Along the flow direction of the coolant, the third oil circuit starts from the cavity and is sequentially connected with the first core lubrication hole, the first end cover sealing hole, the first rotor channel and the second end cover through hole;

[0029] A plurality of the first iron core lubrication holes are arranged along the circumference of the second shaft body, and each of the first iron core lubrication holes is radially opened at the opening end of the second shaft body;

[0030] A plurality of the first end cover sealing holes are arranged along the circumference of the first end cover, and each of the first end cover sealing holes is radially opened on the surface of the first end cover facing the second shaft body;

[0031] A plurality of the first rotor channels are arranged along the circumference of the rotor core, and each of the first rotor channels is opened in the rotor core along the axial direction;

[0032] A plurality of the second end cover through holes are arranged along the circumference of the second end cover, and each of the second end cover through holes is radially opened on the surface of the second end cover facing the second shaft body.

[0033] Preferably, the oil circuit unit includes a fourth oil circuit;

[0034] Along the flow direction of the coolant, the fourth oil circuit starts from the cavity and is sequentially connected with the second core lubrication hole, the second end cover sealing hole, the second rotor channel and the first end cover through hole;

[0035] A plurality of the second core lubrication holes are arranged along the circumference of the second shaft body, and each of the second core lubrication holes is opened radially at the closed end of the second shaft body;

[0036] The second end cover sealing holes are arranged in a plurality along the circumference of the second end cover, and each of the second end cover sealing holes is radially opened on the surface of the second end cover facing the second shaft body;

[0037] A plurality of the second rotor channels are arranged along the circumferential direction of the rotor core, and each of the second rotor channels is opened in the rotor core along the axial direction;

[0038] A plurality of the first end cover through holes are arranged along the circumference of the first end cover, and each of the first end cover through holes is radially opened on the surface of the first end cover facing the second shaft body.

[0039] Preferably, along the circumference of the rotor core, the second rotor channel is located between adjacent first rotor channels;

[0040] Along the circumference of the first end cover, the first end cover through hole is located between adjacent first end cover closed holes;

[0041] Along the circumference of the second end cover, the second end cover sealed hole is located between adjacent second end cover through holes.

[0042] Preferably, the refueling column is column-shaped or shuttle-shaped.

[0043] A motor oil cooling method, applied to the above-mentioned motor oil cooling shaft structure, comprises the following steps:

[0044] Coolant is delivered to the cavity at a set position through a refueling column;

[0045] The coolant flows to both ends of the cavity through the change in diameter of the cavity;

[0046] The coolant at both ends of the cavity is transported to the rotor core, the first end cover and the second end cover through the oil circuit unit.

[0047] Beneficial effects of the present invention:

[0048] The coolant in the first shaft body and the second shaft body of the present invention can reach the set position through the refueling column, and then enter the cavity at the set position. The coolant entering the cavity is thrown toward the inner wall of the cavity under the centrifugal force, and is thrown out from the oil path opened on the inner wall of the cavity. Since the inner wall of the cavity is set as a conical slope, it can guide the coolant, avoid excessive accumulation of oil in the cavity and affect the dynamic balance of the rotor itself.

[0049] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic cross-sectional view of a motor oil-cooling shaft structure at a first rotor channel of the present invention is shown;

[0052] Figure 2 A schematic cross-sectional view of a motor oil-cooling shaft structure at a second rotor channel of the present invention is shown;

[0053] Figure 3 A schematic diagram showing the connection between the first oil circuit, the second oil circuit and the third oil circuit of the present invention is shown;

[0054] Figure 4 A schematic diagram showing the connection between the first oil circuit, the second oil circuit and the fourth oil circuit of the present invention is shown;

[0055] Figure 5 A second embodiment of the refueling column of the present invention is shown;

[0056] Figure 6 A flow chart of an oil cooling method of the present invention is shown.

[0057] In the figure: 1. first shaft body; 11. oil filling column; 12. oil inlet; 121. first bearing lubrication hole; 13. first oil inlet channel; 131. first oil outlet; 14. second oil inlet channel; 15. third oil inlet channel; 151. keyway lubrication hole; 2. second shaft body; 21. cavity; 22. first core lubrication hole; 23. second bearing lubrication hole; 24. second core lubrication hole; 3. rotor core; 31. first rotor channel; 32. second rotor channel; 4. first end cover; 41. first end cover sealed hole; 42. first end cover through hole; 5. second end cover; 51. second end cover through hole; 52. second end cover sealed hole; 6. first bearing; 7. second bearing. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0059] A motor oil-cooled shaft structure, such as Figure 1 As shown, it includes a first shaft body 1, a second shaft body 2, a rotor core 3, a first end cover 4, a second end cover 5 and an oil circuit unit.

[0060] One end of the first shaft body 1 is a stepped shaft structure, and the other end is provided with a refueling column 11 along the axial direction. The second shaft body 2 is integrally welded with the first shaft body 1, and a cavity 21 is provided inside. One end of the cavity 21 is an open end, and the other end is a closed end. The refueling column 11 is provided along the axial direction of the cavity 21 (it can be columnar or shuttle-shaped, see Figure 5 ) until it is connected to the closed end of the cavity 21; the inner diameter of the cavity 21 gradually decreases from the open end to the set position, and gradually increases from the set position to the closed end, forming a conical slope, and the set position is located between the open end and the closed end. In addition, the rotor core 3 is installed on the surface of the second shaft body 2 and can rotate synchronously with the second shaft body 2. The first end cover 4 is installed at one end of the rotor core 3 and is sealed and connected to the surface of the second shaft body 2; the second end cover 5 is installed at the other end of the rotor core 3 and is sealed and connected to the surface of the second shaft body 2. The oil circuit unit includes a plurality of oil circuits opened in the first shaft body 1, the second shaft body 2, the rotor core 3, the first end cover 4 and the second end cover 5, and the oil outlet of at least one of the oil circuits is located at the set position.

[0061] It should be noted that in the above structure, the coolant can reach the set position through the refueling column 11, and then enter the cavity 21 at the set position. The coolant entering the cavity 21 is thrown toward the inner wall of the cavity 21 under the centrifugal force, and is thrown out from the oil passage opened on the inner wall of the cavity 21. Since the inner wall of the cavity 21 is set as a conical slope (the refueling column 11 can be designed to be shuttle-shaped and cooperate with the inner wall of the cavity 21), it can guide the coolant and avoid excessive accumulation of oil in the cavity 21, which will affect the dynamic balance of the rotor itself.

[0062] Further, the position is set to be the symmetry center of the cavity 21 .

[0063] It should be noted that after the position of the setting position cavity 21 is selected at the symmetry center, the coolant can flow from the middle to both sides after entering the cavity 21, and the setting position corresponds exactly to the position where the inner diameter of the cavity 21 is the smallest. Therefore, the oil outlet can be balanced from the oil path at the end of the cavity 21, thereby avoiding uneven flow distribution.

[0064] Furthermore, the oil circuit unit mainly includes a first oil circuit, a second oil circuit, a third oil circuit and a fourth oil circuit. Figure 1-Figure 5 Explain it.

[0065] Combination Figure 1 and Figure 4 It can be seen that along the flow direction of the coolant, the first oil circuit starts from one end of the first shaft body 1, and the first shaft body 1 is axially provided with an oil inlet 12, a first oil inlet channel 13 and a second oil inlet channel 14 that are connected in sequence; and a third oil inlet channel 15 that is connected to the second oil inlet channel 14 along the axis is provided in the second shaft body 2; and a keyway lubrication hole 151 that is connected to the third oil inlet channel 15 is provided in the second shaft body 2, and the keyway lubrication hole 151 is inclined relative to the axis of the second shaft body 2. The first oil inlet channel 13 is radially provided with a plurality of first oil outlets 131 at a set position.

[0066] It should be noted that through Figure 4 It can be seen that the coolant enters the refueling column 11 through the oil inlet 12. After reaching the set position, part of the coolant enters the cavity 21 through the first oil outlet 131, and the other part of the coolant enters the second oil inlet channel 14, and then reaches the third oil inlet channel 15. Finally, the coolant transported from the third oil inlet channel 15 can reach the keyway on the right, thereby providing cooling and lubrication for the keyway.

[0067] In addition, Figure 1The inner diameter of the middle oil inlet 12 is larger than the inner diameter of the first oil inlet channel 13, and the inner diameter of the first oil inlet channel 13 is larger than the inner diameter of the second oil inlet channel 14, so that a step structure can be formed at the set position to ensure that the coolant flowing along the refueling column 11 can partially enter the cavity 21. The oil inlet 12, the first oil inlet channel 13, and the second oil inlet channel 14 are connected to form a main channel. The aperture of the main channel is reduced. Under the influence of pressure difference and resistance, the flow rate of the branch can be increased, making the flow distribution more uniform.

[0068] In addition, the oil inlet 12 is radially provided with a plurality of first bearing lubrication holes 121 for conveying coolant to the first bearing 6 ; the first bearing 6 is mounted at the end of the first shaft 1 and is located at the outlet of the first bearing lubrication hole 121 .

[0069] It should be noted that part of the coolant entering the oil inlet 12 can flow into the first bearing lubrication hole 121. The first bearing 6 is installed at the step of the first shaft body 1. The coolant flowing out of the first bearing lubrication hole 121 can provide cooling and lubrication for the first bearing 6.

[0070] Combination Figure 1 and Figure 4 It can be seen that in the second oil circuit, a plurality of second bearing lubrication holes 23 are opened at the end of the cavity 21 away from the first end cover 4; the second oil circuit is used to transport the coolant out through the second bearing lubrication holes 23 starting from the cavity 21. Moreover, a second bearing 7 is installed at the outlet of the second bearing lubrication hole 23, and the second bearing 7 is installed on the surface of the second shaft body 2.

[0071] It should be noted that part of the coolant that enters the cavity 21 can flow to the second bearing 7 through the second bearing lubrication hole 23 , thereby providing cooling and lubrication for the second bearing 7 .

[0072] like Figure 1 As shown, along the flow direction of the coolant, the third oil circuit starts from the cavity 21, and is connected in sequence with the first iron core lubrication hole 22, the first end cover sealing hole 41, the first rotor channel 31, and the second end cover through hole 51. Among them, a plurality of first iron core lubrication holes 22 are arranged along the circumference of the second shaft body 2, and each first iron core lubrication hole 22 is radially opened at the open end of the second shaft body 2; a plurality of first end cover sealing holes 41 are arranged along the circumference of the first end cover 4, and each first end cover sealing hole 41 is radially opened on the surface of the first end cover 4 facing the second shaft body 2; a plurality of first rotor channels 31 are arranged along the circumference of the rotor core 3, and each first rotor channel 31 is axially opened in the rotor core 3; a plurality of second end cover through holes 51 are arranged along the circumference of the second end cover 5, and each second end cover through hole 51 is radially opened on the surface of the second end cover 5 facing the second shaft body 2.

[0073] It should be noted that, combined with Figure 1 and Figure 3 It can be seen that in the third oil circuit, the coolant enters the cavity 21 and flows out from Figure 3 The left end of the cooling liquid enters the first core lubrication hole 22 and then enters the first end cover sealing hole 41. After that, the cooling liquid enters the first rotor channel 31 along the axial direction and finally flows to the outside of the rotor core 3 along the second end cover through hole 51 in the radial direction.

[0074] like Figure 2 As shown, along the flow direction of the coolant, the fourth oil circuit starts from the cavity 21, and is connected in sequence with the second iron core lubrication hole 24, the second end cover sealing hole 52, the second rotor channel 32 and the first end cover through hole 42. Among them, a plurality of second iron core lubrication holes 24 are arranged along the circumference of the second shaft body 2, and each second iron core lubrication hole 24 is radially opened at the closed end of the second shaft body 2; a plurality of second end cover sealing holes 52 are arranged along the circumference of the second end cover 5, and each second end cover sealing hole 52 is radially opened on the surface of the second end cover 5 facing the second shaft body 2; a plurality of second rotor channels 32 are arranged along the circumference of the rotor core 3, and each second rotor channel 32 is axially opened in the rotor core 3; a plurality of first end cover through holes 42 are arranged along the circumference of the first end cover 4, and each first end cover through hole 42 is radially opened on the surface of the first end cover 4 facing the second shaft body 2.

[0075] It should be noted that, combined with Figure 2 and Figure 4 It can be seen that after the coolant enters the cavity 21, part of it will gather at Figure 3 The coolant flows to the right end of the hollow cavity 21 , and then enters the radial second core lubrication hole 24 and the second end cover sealing hole 52 , and then enters the first end cover through hole 42 axially, and finally flows to the outside of the rotor core 3 through the first end cover through hole 42 .

[0076] It should be noted that the flow paths of the third oil circuit and the fourth oil circuit are exactly opposite, so along the circumference of the rotor core 3, the second rotor channel 32 is located between adjacent first rotor channels 31; along the circumference of the first end cover 4, the first end cover through hole 42 is located between adjacent first end cover closed holes 41; along the circumference of the second end cover 5, the second end cover closed hole 52 is located between adjacent second end cover through holes 51.

[0077] Further, in Figure 1-Figure 4 In the structure, the first end cover sealed hole 41 and the first end cover through hole 42, the second end cover through hole 51 and the second end cover sealed hole 52 together with the rotor core 3 constitute a flow channel for the coolant, and the openings of the end cover through holes (the first end cover through hole 42 and the second end cover through hole 51) face the outside of the rotor core 3, and the openings of the end cover sealed holes (the first end cover sealed hole 41 and the second end cover sealed hole 52) face the inside of the rotor core 3.

[0078] like Figure 6 As shown, a motor oil cooling method is applied to Figure 1-Figure 5 A motor oil-cooling shaft structure includes the following steps:

[0079] S1: Cooling liquid is delivered to the cavity 21 at a set position through the refueling column 11.

[0080] S2: The coolant flows to both ends of the cavity 21 due to the change in diameter of the cavity 21 .

[0081] S3: The coolant at both ends of the cavity 21 is transported to the rotor core 3, the first end cover 4 and the second end cover 5 through the oil circuit unit.

[0082] It should be noted that in S1-S3, the coolant flows along the path from the first oil circuit to the fourth oil circuit mentioned above, which can quickly cool down the motor components and lubricate the motor components.

[0083] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor oil-cooled shaft structure, characterized in that: include: The first shaft body (1) is provided with a refueling column (11) along the axial direction; The second shaft body (2) is connected to the first shaft body (1) in an integral manner, and a cavity (21) is provided inside the second shaft body, wherein one end of the cavity (21) is an open end and the other end is a closed end; The refueling column (11) is arranged axially along the cavity (21) until it is connected to the closed end of the cavity (21); the inner diameter of the cavity (21) gradually decreases from the open end to the set position, and gradually increases from the set position to the closed end, forming a tapered slope; the set position is located between the open end and the closed end; A rotor core (3) is mounted on the surface of the second shaft (2); A first end cover (4) is mounted on one end of the rotor core (3) and is sealed and connected to the surface of the second shaft body (2); A second end cover (5) is mounted on the other end of the rotor core (3) and is sealed and connected to the surface of the second shaft body (2); An oil circuit unit comprises a plurality of oil circuits provided in a first shaft body (1), a second shaft body (2), a rotor core (3), a first end cover (4) and a second end cover (5); The oil outlet of at least one oil circuit is located at a set position.

2. The motor oil-cooling shaft structure according to claim 1, characterized in that: The set position is the symmetry center of the cavity (21).

3. The motor oil-cooling shaft structure according to claim 1, characterized in that: The oil circuit unit includes a first oil circuit; Along the flow direction of the coolant, the first oil circuit starts from one end of the first shaft body (1), and is provided with an oil inlet (12), a first oil inlet channel (13) and a second oil inlet channel (14) which are connected in sequence along the axial direction of the first shaft body (1); Furthermore, a third oil inlet passage (15) is provided in the second shaft body (2) and is connected to the second oil inlet passage (14) along the axis line; Furthermore, a plurality of keyway lubrication holes (151) communicating with the third oil inlet passage (15) are provided in the second shaft body (2), and the keyway lubrication holes (151) are arranged obliquely relative to the axis of the second shaft body (2).

4. The motor oil-cooling shaft structure according to claim 3, characterized in that: The first oil inlet channel (13) is provided with a plurality of first oil outlets (131) in a radial direction at a set position.

5. The motor oil-cooling shaft structure according to claim 3, characterized in that: The inner diameter of the oil inlet (12) is greater than the inner diameter of the first oil inlet passage (13), and the inner diameter of the first oil inlet passage (13) is greater than the inner diameter of the second oil inlet passage (14).

6. The motor oil-cooling shaft structure according to claim 3, characterized in that: The oil inlet (12) is radially provided with a plurality of first bearing lubrication holes (121), wherein the first bearing lubrication holes (121) are used to transport cooling liquid to the first bearing (6); The first bearing (6) is mounted on the end of the first shaft body (1) and is located at the outlet of the first bearing lubrication hole (121).

7. The motor oil-cooling shaft structure according to claim 3, characterized in that: The oil circuit unit includes a second oil circuit; In the second oil circuit, a plurality of second bearing lubrication holes (23) are provided at the end of the cavity (21) away from the first end cover (4); The second oil circuit is used to transport the coolant out through the second bearing lubrication hole (23) starting from the cavity (21).

8. The motor oil-cooling shaft structure according to claim 7, characterized in that: A second bearing (7) is installed at the outlet of the second bearing lubrication hole (23), and the second bearing (7) is installed on the surface of the second shaft body (2).

9. The motor oil-cooling shaft structure according to claim 3, characterized in that: The oil circuit unit includes a third oil circuit; Along the flow direction of the coolant, the third oil circuit starts from the cavity (21) and is sequentially connected to the first iron core lubrication hole (22), the first end cover sealing hole (41), the first rotor channel (31) and the second end cover through hole (51); A plurality of the first iron core lubrication holes (22) are arranged along the circumference of the second shaft body (2), and each of the first iron core lubrication holes (22) is radially opened at the opening end of the second shaft body (2); A plurality of the first end cover sealing holes (41) are arranged along the circumference of the first end cover (4), and each of the first end cover sealing holes (41) is radially opened on the surface of the first end cover (4) facing the second shaft body (2); A plurality of the first rotor channels (31) are arranged along the circumference of the rotor core (3), and each of the first rotor channels (31) is opened in the rotor core (3) along the axial direction; A plurality of the second end cover through holes (51) are arranged along the circumference of the second end cover (5), and each of the second end cover through holes (51) is radially opened on the surface of the second end cover (5) facing the second shaft body (2).

10. The motor oil-cooling shaft structure according to claim 9, characterized in that: The oil circuit unit includes a fourth oil circuit; Along the flow direction of the coolant, the fourth oil circuit starts from the cavity (21) and is sequentially connected to the second iron core lubrication hole (24), the second end cover sealing hole (52), the second rotor channel (32) and the first end cover through hole (42); A plurality of second iron core lubrication holes (24) are arranged along the circumference of the second shaft body (2), and each of the second iron core lubrication holes (24) is radially opened at the closed end of the second shaft body (2); A plurality of the second end cover sealing holes (52) are arranged along the circumference of the second end cover (5), and each of the second end cover sealing holes (52) is radially opened on the surface of the second end cover (5) facing the second shaft body (2); A plurality of the second rotor channels (32) are arranged along the circumference of the rotor core (3), and each of the second rotor channels (32) is opened in the rotor core (3) along the axial direction; A plurality of the first end cover through holes (42) are arranged along the circumference of the first end cover (4), and each of the first end cover through holes (42) is radially opened on the surface of the first end cover (4) facing the second shaft body (2).

11. The motor oil-cooling shaft structure according to claim 10, characterized in that: Along the circumferential direction of the rotor core (3), the second rotor channel (32) is located between adjacent first rotor channels (31); Along the circumference of the first end cover (4), the first end cover through hole (42) is located between adjacent first end cover closed holes (41); Along the circumferential direction of the second end cover (5), the second end cover sealing hole (52) is located between adjacent second end cover through holes (51).

12. The motor oil-cooling shaft structure according to any one of claims 1 to 11, characterized in that: The refueling column (11) is column-shaped or shuttle-shaped.

13. A motor oil cooling method, applied to a motor oil cooling shaft structure according to any one of claims 1 to 12, characterized in that: The following steps are involved: delivering cooling liquid to the cavity (21) at a set position through a refueling column (11); The cooling liquid flows to both ends of the cavity (21) through the change in diameter of the cavity (21); The cooling liquid at both ends of the cavity (21) is transported to the rotor core (3), the first end cover (4) and the second end cover (5) through the oil circuit unit.

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