Oil cooling system of coaxial motor, motor and motor drive assembly

Abstract

The present invention provides an oil cooling system, a motor and a motor drive assembly of a coaxial motor, which relates to the technical field of electric vehicle drive, and solves the problem that the motor rotor cannot be oil cooled in the existing coaxial motor. The oil cooling system of the coaxial motor includes: a first oil circuit, the first oil circuit is located between the upper housing of the motor and the motor stator; the first end of the second oil circuit is connected to the first oil circuit through a first guide groove, and the second oil circuit is located between the upper housing of the motor and the motor stator; the third oil circuit is located on the rear end cover of the motor rotor, and the first end of the third oil circuit is connected to the second end of the second oil circuit; the fourth oil circuit surrounds the first end of the motor half shaft, and the fourth oil circuit is connected to the second end of the third oil circuit; the fifth oil circuit is located between the motor half shaft and the motor rotor, and the first end of the fifth oil circuit is connected to the fourth oil circuit. The scheme of the present invention realizes the oil cooling technology for the stator and rotor of the motor under normal working conditions of the motor, strengthens the heat dissipation capacity of the motor, and improves the output power of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle driving, and in particular to an oil cooling system of a coaxial motor, a motor and a motor driving assembly. Background Art

[0002] At present, the drive motors of new energy vehicles are gradually tending towards high power density and high speed, and the motor cooling problem is becoming increasingly prominent. Traditional drive motors use water cooling or air cooling. The heat of the motor is transferred from the stator core to the motor housing, and finally the heat is taken away by the cooling medium inside or on the surface of the housing. In existing coaxial oil-cooled motors, most of them only cool the stator of the motor with oil, but lack simultaneous oil cooling of the stator and rotor of the motor. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an oil cooling system for a coaxial motor, a motor and a motor drive assembly to achieve oil cooling of the stator and rotor of the motor.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0005] An embodiment of the present invention provides an oil cooling system for a coaxial motor, comprising:

[0006] A first oil circuit, wherein the first oil circuit is located between the motor upper housing and the motor stator;

[0007] a second oil circuit, wherein a first end of the second oil circuit is connected to the first oil circuit through a first guide groove, and the second oil circuit is located between the motor upper housing and the motor stator;

[0008] a third oil circuit, the third oil circuit being located on the rear end cover of the motor rotor, the first end of the third oil circuit being connected to the second end of the second oil circuit;

[0009] a fourth oil circuit, the fourth oil circuit surrounding the first end of the motor half shaft, the fourth oil circuit being connected to the second end of the third oil circuit;

[0010] A fifth oil circuit, wherein the fifth oil circuit is located between the motor half shaft and the motor rotor, and a first end of the fifth oil circuit is connected to the fourth oil circuit.

[0011] Optionally, a plurality of oil holes are provided in the first oil circuit.

[0012] Optionally, the oil cooling system of the coaxial motor further includes:

[0013] A stator outer circle oil circuit, wherein the stator outer circle oil circuit is connected to the oil hole of the first oil circuit;

[0014] The oil return circuit is located on the motor stator and the lower housing of the motor.

[0015] Optionally, a second guide groove is provided at the first end of the fifth oil circuit;

[0016] A third guide groove is provided at the second end of the fifth oil circuit;

[0017] The second guide groove and the third guide groove are arranged vertically and in different planes.

[0018] Optionally, the oil cooling system of the coaxial motor further includes:

[0019] A first cover plate, wherein the first cover plate is sleeved on a rotating shaft at a first end of the motor rotor, and the first cover plate is located between the motor rotor and a first winding of the motor stator;

[0020] The second cover plate is sleeved on the rotating shaft at the second end of the motor rotor, and the second cover plate is located between the motor rotor and the second winding of the motor stator.

[0021] Optionally, a sixth oil circuit and a fourth guide groove are provided on the first cover plate;

[0022] The sixth oil circuit is disposed on the first cover plate in a circumferential manner, and the sixth oil circuit is connected to the fifth oil circuit through the second guide groove;

[0023] The first end of the fourth guide groove is connected to the sixth oil path, and the second end of the fourth guide groove is connected to the first winding.

[0024] Optionally, a seventh oil circuit and a fifth guide groove are provided on the second cover plate;

[0025] The seventh oil circuit is disposed on the second cover plate in a circumferential manner, and the seventh oil circuit is connected to the fifth oil circuit through the third guide groove;

[0026] The first end of the fifth guide groove is connected to the seventh oil circuit, and the second end of the fifth guide groove is connected to the second winding.

[0027] Optionally, the oil cooling system of the coaxial motor further includes:

[0028] A connecting groove, wherein the connecting groove is located on the motor rotor between the first cover plate and the second cover plate, wherein a first end of the connecting groove is connected to the sixth oil circuit via a fourth guide groove, and a second end of the connecting groove is connected to the seventh oil circuit via a fifth guide groove.

[0029] An embodiment of the present invention further provides a coaxial motor, comprising the oil cooling system of the coaxial motor as described above.

[0030] An embodiment of the present invention further provides an electric drive assembly, including a disconnect system, a reducer assembly, a controller, and the coaxial motor as described above.

[0031] The above solution of the present invention includes at least the following beneficial effects:

[0032] The above scheme of the present invention includes a coaxial motor oil cooling system including: a first oil circuit, the first oil circuit is located between the motor upper housing and the motor stator; a second oil circuit, the first end of the second oil circuit is connected to the first oil circuit through a first guide groove, the second oil circuit is located between the motor upper housing and the motor stator; a third oil circuit, the third oil circuit is located on the rear end cover of the motor rotor, the first end of the third oil circuit is connected to the second end of the second oil circuit; a fourth oil circuit, the fourth oil circuit surrounds the first end of the motor half shaft, the fourth oil circuit is connected to the second end of the third oil circuit; a fifth oil circuit, the fifth oil circuit is located between the motor half shaft and the motor rotor, the first end of the fifth oil circuit is connected to the fourth oil circuit. The problem that the motor rotor cannot be oil-cooled in the existing coaxial motor is solved, the oil cooling technology of the stator and rotor of the motor is realized under normal working conditions of the motor, the heat dissipation capacity of the motor is enhanced, and the output power of the motor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a cross-sectional view of the oil cooling system, the motor and the motor drive assembly of the coaxial motor of the present invention;

[0034] Figure 2 It is a three-dimensional diagram of the oil cooling system, the motor and the motor drive assembly of the coaxial motor of the present invention;

[0035] Figure 3 It is a model diagram of the stator and rotor oil circuits of the oil cooling system of the coaxial motor of the present invention;

[0036] Figure 4 It is a model diagram of the stator oil circuit of the oil cooling system of the coaxial motor of the present invention;

[0037] Figure 5 It is a motor rotor oil circuit model diagram of the oil cooling system of the coaxial motor of the present invention;

[0038] Figure 6 is a three-dimensional cross-sectional view of the stator and rotor of the oil cooling system of the coaxial motor of the present invention;

[0039] Figure 7 is a cross-sectional view of the stator and rotor of the oil cooling system of the coaxial motor of the present invention;

[0040] Figure 8 It is a three-dimensional view of the two end covers of the rotor of the oil cooling system of the coaxial motor of the present invention;

[0041] Fig. 9 It is a three-dimensional cross-sectional view of the two end covers of the rotor of the oil cooling system of the coaxial motor of the present invention;

[0042] Among them, 1. the first oil circuit; 2. the second oil circuit; 21. the first guide groove; 22. the second guide groove; 23. the third guide groove; 24. the fourth guide groove; 25. the fifth guide groove; 3. the third oil circuit; 4. the fourth oil circuit; 5. the fifth oil circuit; 6. the sixth oil circuit; 7. the seventh oil circuit; 8. the eighth oil circuit; 9. the return oil circuit; 10. the oil hole; 11. the upper housing of the motor; 111. the lower housing of the motor; 12. the stator of the motor; 121. the first winding; 122 the second winding; 13. the rear end cover of the motor rotor; 14. the motor half shaft; 15. the motor rotor; 151. the first cover plate; 152. the second cover plate; 153. the connecting groove; 16. the disconnect system; 17. the reducer assembly; 18. the controller. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] like Figures 1 to 5 As shown, an embodiment of the present invention provides an oil cooling system for a coaxial motor, comprising:

[0045] A first oil circuit 1, wherein the first oil circuit 1 is located between the motor upper housing 11 and the motor stator 12;

[0046] A second oil circuit 2, wherein a first end of the second oil circuit 2 is connected to the first oil circuit 1 through a first guide groove 21, and the second oil circuit 2 is located between the motor upper housing 11 and the motor stator 12;

[0047] A third oil circuit 3, wherein the third oil circuit 3 is located on the rear end cover 13 of the motor rotor, and a first end of the third oil circuit 3 is connected to a second end of the second oil circuit 2;

[0048] A fourth oil circuit 4, wherein the fourth oil circuit 4 surrounds a first end of the motor half shaft 14, and the fourth oil circuit 4 is connected to a second end of the third oil circuit 3;

[0049] A fifth oil circuit 5, wherein the fifth oil circuit 5 is located between the motor half shaft 14 and the motor rotor 15, and a first end of the fifth oil circuit 5 is connected to the fourth oil circuit 4;

[0050] an eighth oil circuit 8, wherein the eighth oil circuit 8 is connected to the oil hole 10 of the first oil circuit 1;

[0051] An oil return circuit 9, wherein the oil return circuit 9 is located on the motor stator 12 and the motor lower housing 111;

[0052] The first oil circuit 1 is provided with a plurality of oil holes 10 .

[0053] In this embodiment, the first oil circuit 1 and the second oil circuit 2 are arranged in parallel on the inner wall of the motor upper housing 11, the first oil circuit 1 is arranged just above the motor stator 12, a plurality of oil holes 10 penetrating the inner wall of the motor upper housing are arranged on the first oil circuit 1, the first end of the first oil circuit 1 is an oil inlet for cooling oil, and the second end of the first oil circuit 1 is in a closed state; after the cooling oil enters the first oil circuit 1, it is divided into two paths, the first path of cooling oil flows toward the second end of the first oil circuit 1, and the second path of cooling oil flows into the second oil circuit 2 through the first guide groove 21 ; In the process of the first cooling oil flowing to the second end of the first oil circuit 1, it flows to the motor stator 12 through the oil hole 10 to form the eighth oil circuit 8, thereby realizing oil cooling of the motor stator 12. At the same time, the cooling oil that absorbs heat finally drips into the bottom return oil circuit 9 by free gravity; the second cooling oil that flows into the second oil circuit 2 flows into the fourth oil circuit 4 surrounding the first end of the motor half shaft 14 through the third oil circuit 3, and flows through the fourth oil circuit 4 to the fifth oil circuit 5 formed by the gap between the motor half shaft 14 and the motor rotor 15, thereby realizing oil cooling of the motor rotor through the fifth oil circuit 5.

[0054] like Figure 6 As shown, in an optional embodiment of the present invention, a second guide groove 22 is provided at the first end of the fifth oil circuit 5;

[0055] The second end of the fifth oil passage 5 is provided with a third guide groove 23;

[0056] The second guide groove 22 and the third guide groove 23 are arranged vertically and in different planes.

[0057] In this embodiment, the second guide groove 22 is communicated with the first end of the fifth oil circuit 5, the third guide groove 23 is communicated with the second end of the fifth oil circuit 5, and the second guide groove 22 and the third guide groove 23 are vertically arranged in different planes.

[0058] In an optional embodiment of the present invention, the oil cooling system of the coaxial motor further includes:

[0059] A first cover plate 151, wherein the first cover plate 151 is sleeved on the rotating shaft at the first end of the motor rotor 15, and the first cover plate 151 is located between the motor rotor 15 and the first winding 121 of the motor stator 12;

[0060] The second cover plate 152 is sleeved on the rotating shaft at the second end of the motor rotor 15 , and the second cover plate 152 is located between the motor rotor 15 and the second winding 122 of the motor stator.

[0061] like Figure 8 and Fig. 9 As shown, in an optional embodiment of the present invention, the first cover plate 151 is provided with a sixth oil passage 6 and a fourth guide groove 24;

[0062] The sixth oil circuit 6 is disposed on the first cover plate 151 in a circumferential manner, and the sixth oil circuit 6 is connected to the fifth oil circuit 5 through the second guide groove 22;

[0063] A first end of the fourth guide groove 24 is connected to the sixth oil path 6 , and a second end of the fourth guide groove 24 is connected to the first winding 121 .

[0064] The second cover plate 152 is provided with a seventh oil passage 7 and a fifth guide groove 25;

[0065] The seventh oil circuit 7 is disposed on the second cover plate 152 in a circumferential manner, and the seventh oil circuit 7 is connected to the fifth oil circuit 5 through the third guide groove 23;

[0066] The first end of the fifth guide groove 25 is connected to the seventh oil path 7 , and the second end of the fifth guide groove 25 is connected to the second winding 122 .

[0067] like Figure 6 and Figure 7 As shown, in this embodiment, the sixth oil circuit 6 is located near the connection between the first cover plate 151 and the first end of the motor rotor 15, and the seventh oil circuit 7 is located near the connection between the second cover plate 152 and the second end of the motor rotor 15. The number of the fourth guide groove 24 and the fifth guide groove 25 is not unique, and four are symmetrically arranged in this embodiment.

[0068] In this embodiment, when the motor half shaft 14 and the motor rotor 15 are working, a pumping effect will be caused. Under the pumping effect, the cooling oil in the fifth oil circuit 5 will be sucked into the sixth oil circuit 6 and the seventh oil circuit 7, and sprayed to the first winding 121 and the second winding 122 through the second end of the fourth guide groove 24 and the second end of the fifth guide groove 25, respectively, to achieve secondary oil cooling of the two windings of the motor stator 12, and the cooling oil that absorbs heat will eventually drip into the bottom oil return circuit 9 by free gravity;

[0069] In an optional embodiment of the present invention, the connecting groove 153 is located on the motor rotor 15 between the first cover plate 151 and the second cover plate 152, and the first end of the connecting groove 153 is connected to the sixth oil circuit 6 through the fourth guide groove 24, and the second end of the connecting groove 153 is connected to the seventh oil circuit 7 through the fifth guide groove 25.

[0070] In this embodiment, the number of the connecting grooves 153 is not unique. In this embodiment, two connecting grooves 153 are symmetrically arranged along the rotation axis of the motor rotor 15. The connecting grooves 153 are mainly used for oil cooling the inside of the motor rotor 15 when the motor is working.

[0071] The specific working principle of the oil cooling system of the coaxial motor described in the embodiment of the present invention is as follows: the cooling oil enters the oil pipe through the first end of the first oil circuit 1, and the cooling oil is divided into two paths after entering the first oil circuit 1. The first cooling oil flows toward the second end of the first oil circuit 1, and the second cooling oil flows into the second oil circuit 2 through the first guide groove 21; wherein the first cooling oil flows to the second end of the first oil circuit 1 through the oil hole 10 to form the eighth oil circuit 8 on the motor stator 12, thereby realizing oil cooling of the motor stator 12, and the cooling oil that absorbs heat finally drips into the bottom return oil circuit 9 by free gravity; the second cooling oil that flows into the second oil circuit 2 flows into the fourth oil circuit 4 surrounding the first end of the motor half shaft 14 through the third oil circuit 3, and The oil flows through the fourth oil path 4 to the fifth oil path 5 formed by the gap between the motor half shaft 14 and the motor rotor 15. When the motor half shaft 14 and the motor rotor 15 rotate, a pumping action will be caused. Under the pumping action, the cooling oil in the fifth oil path 5 will be sucked into the sixth oil path 6 and the seventh oil path 7, and sprayed to the first winding 121 and the second winding 122 through the second end of the fourth guide groove 24 and the second end of the fifth guide groove 25, respectively. At the same time, a part of the oil flows into the connecting groove 153 through the fourth guide groove 24 and the fifth guide groove 25, thereby realizing oil cooling of the motor rotor 15 and secondary oil cooling of the two windings of the motor stator 12. At the same time, the cooling oil that absorbs heat finally drips into the bottom oil return path 9 by free gravity. The motor stator and rotor can be fully cooled, so that the power density of the entire electric drive system is effectively improved. At the same time, the half-shaft output end matching design of the disconnection system and the electric drive assembly can meet the different needs of the main and auxiliary drives, and can achieve a better platform design.

[0072] An embodiment of the present invention further provides a coaxial motor, comprising the oil cooling system of the coaxial motor described in any one of the above embodiments.

[0073] like Figure 2 As shown, an embodiment of the present invention further provides a motor drive assembly, including a disconnect system 16, a reducer assembly 17, a controller 18, and the coaxial motor as described above.

[0074] The present invention solves the problem that the motor rotor cannot be oil-cooled in the existing coaxial motor, realizes oil cooling of the stator and rotor of the motor when the motor works normally, enhances the heat dissipation capacity of the motor, and improves the output power of the motor.

[0075] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An oil cooling system for a coaxial motor, characterized in that: include: A first oil circuit (1), wherein the first oil circuit (1) is located between an upper housing (11) of the motor and a stator (12) of the motor; A second oil circuit (2), wherein a first end of the second oil circuit (2) is connected to the first oil circuit (1) via a first guide groove (21), and the second oil circuit (2) is located between the motor upper housing (11) and the motor stator (12); A third oil circuit (3), the third oil circuit (3) being located on a rear end cover (13) of the motor rotor, and a first end of the third oil circuit (3) being connected to a second end of the second oil circuit (2); a fourth oil circuit (4), the fourth oil circuit (4) surrounding the first end of the motor half shaft (14), the fourth oil circuit (4) being connected to the second end of the third oil circuit (3); a fifth oil circuit (5), the fifth oil circuit (5) being located between the motor half shaft (14) and the motor rotor (15), and a first end of the fifth oil circuit (5) being connected to the fourth oil circuit (4); The first oil circuit (1) is provided with a plurality of oil holes (10); The system further comprises: A stator outer oil circuit (8), wherein the stator outer oil circuit (8) is connected to the oil hole (10) of the first oil circuit (1); An oil return circuit (9), wherein the oil return circuit (9) is located on the motor stator and the motor lower housing (111).

2. The oil cooling system of the coaxial motor according to claim 1, characterized in that: A second guide groove (22) is provided at the first end of the fifth oil passage (5); A third guide groove (23) is provided at the second end of the fifth oil circuit (5); The second guide groove (22) and the third guide groove (23) are arranged vertically and in different planes.

3. The oil cooling system of the coaxial motor according to claim 2, characterized in that: Also includes: a first cover plate (151), the first cover plate (151) being sleeved on a rotating shaft at a first end of the motor rotor (15), the first cover plate (151) being located between the motor rotor (15) and a first winding (121) of the motor stator (12); A second cover plate (152), the second cover plate (152) is sleeved on the rotating shaft at the second end of the motor rotor (15), and the second cover plate (152) is located between the motor rotor (15) and the second winding (122) of the motor stator (12).

4. The oil cooling system of the coaxial motor according to claim 3, characterized in that: The first cover plate (151) is provided with a sixth oil passage (6) and a fourth guide groove (24); The sixth oil circuit (6) is disposed on the first cover plate (151) in a circumferential manner, and the sixth oil circuit (6) is connected to the fifth oil circuit (5) through a second guide groove (22); The first end of the fourth guide groove (24) is connected to the sixth oil path (6), and the second end of the fourth guide groove (24) is connected to the first winding (121).

5. The oil cooling system of the coaxial motor according to claim 4, characterized in that: The second cover plate (152) is provided with a seventh oil passage (7) and a fifth guide groove (25); The seventh oil circuit (7) is disposed on the second cover plate (152) in a circumferential manner, and the seventh oil circuit (7) is connected to the fifth oil circuit (5) through a third guide groove (23); The first end of the fifth guide groove (25) is connected to the seventh oil circuit (7), and the second end of the fifth guide groove (25) is connected to the second winding (122).

6. The oil cooling system of the coaxial motor according to claim 5, characterized in that: Also includes: A connecting groove (153), the connecting groove (153) being located on the motor rotor (15) between the first cover plate (151) and the second cover plate (152), the first end of the connecting groove (153) being connected to the sixth oil circuit (6) via a fourth guide groove (24), and the second end of the connecting groove (153) being connected to the seventh oil circuit (7) via a fifth guide groove (25).

7. A coaxial motor, characterized in that: An oil cooling system comprising a coaxial motor as claimed in any one of claims 1 to 6.

8. A motor drive assembly, characterized in that: It comprises a disconnect system (16), a reducer assembly (17), a controller (18), and the coaxial motor as claimed in claim 7.

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