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CN-122001155-A - Motor, electric drive assembly system and vehicle

CN122001155ACN 122001155 ACN122001155 ACN 122001155ACN-122001155-A

Abstract

The present disclosure relates to an electric machine (1) comprising a stator (10), a housing (20) comprising a housing wall (20 a) defining a receiving space (S), the stator (10) being received in the receiving space (S). The housing (20) comprises a cooling channel (21) and an oil spraying hole (22), the cooling channel (21) is arranged in the housing wall (20 a), the oil spraying hole (22) is communicated with the cooling channel (21) and the accommodating space (S), and a cooling medium circulates in the cooling channel (21) and is sprayed towards the stator (10) through the oil spraying hole (22). The disclosure also relates to an electric drive train comprising such an electric machine and a vehicle comprising such an electric drive train.

Inventors

  • YING RENLONG
  • WANG SHENGJIAN
  • ZHANG XUEJUN
  • HAN WENFEI
  • CAO SHIHAO

Assignees

  • 法雷奥新能源汽车德国有限责任公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (20)

  1. 1. An electric machine (1), characterized in that it comprises: a stator (10), A housing (20) comprising a housing wall (20 a) defining a receiving space (S) within which the stator (10) is received, Wherein, casing (20) include cooling channel (21) and nozzle opening (22), cooling channel (21) set up in casing wall (20 a), nozzle opening (22) intercommunication cooling channel (21) with accommodation space (S), cooling medium circulate in cooling channel (21) and pass through nozzle opening (22) are directed to stator (10) spray.
  2. 2. An electric machine (1) according to claim 1, characterized in that, The housing (20) comprises a middle section (23), a first end cap (24 a) and a second end cap (24 b) located on both sides of the middle section (23), the first end cap (24 a) and the second end cap (24 b) axially clamping the middle section (23) to form the housing (10).
  3. 3. An electric machine (1) according to claim 2, characterized in that, The stator (10) comprises a stator body (11) and winding end parts (12) extending axially beyond both ends of the stator body (11), The stator body (11) is held in the intermediate section (23) by press-fitting.
  4. 4. An electric machine (1) according to claim 2 or 3, characterized in that, The cooling channel (21) comprises a cooling medium inlet (21 a), a cooling medium outlet (21 b) and a plurality of axial grooves (25) extending axially through the intermediate section (23), Wherein the cooling medium flows into the cooling channel (21) through the cooling medium inlet (21 a), flows through each axial slot (25), and flows out from the cooling medium outlet (21 b).
  5. 5. An electric machine (1) according to claim 4, characterized in that, The housing (20) comprises a plurality of oil spray holes (22) arranged at two axial ends of the middle section (23), and each axial groove (25) is communicated to the accommodating space (S) through at least one oil spray hole (22) at two axial ends.
  6. 6. An electric machine (1) according to claim 5, characterized in that, Each of the axial grooves (25) communicates at both axial ends with the accommodation space (S) through a plurality of the oil jet holes (22) arranged circumferentially.
  7. 7. An electric machine (1) according to claim 4, characterized in that, The axial grooves (25) are uniformly distributed in the circumferential direction.
  8. 8. An electric machine (1) according to claim 4, characterized in that, The axial groove (25) has an arcuate cross-sectional shape.
  9. 9. An electric machine (1) according to claim 4, characterized in that, The cooling channel (21) further comprises a plurality of connecting slots (26) provided on the first end cap (24 a) and the second end cap (24 b), At least one axial groove (25) of the plurality of axial grooves (25) is open toward the accommodation space (S) at one axial end and communicates with the connecting groove (26) at the other axial end, and Other axial grooves (25) of the plurality of axial grooves (25) communicate with the connecting grooves (26) on the first end cover (24 a) and the second end cover (24 b) at both axial ends, respectively.
  10. 10. An electric machine (1) according to claim 9, characterized in that, The cooling medium inlet (21 a) communicates with one of the plurality of connection grooves (26), and The cooling medium outlet (21 b) communicates with another one of the plurality of connection grooves (26) or with the accommodation space (S).
  11. 11. An electric machine (1) according to claim 9, characterized in that, Each connecting groove (26) communicates with two adjacent axial grooves (25).
  12. 12. An electric machine (1) according to claim 9, characterized in that, The connecting grooves (26) include a first connecting groove (26 a) communicating with two adjacent axial grooves (25) and a second connecting groove (26 b) communicating with one axial groove (25).
  13. 13. An electric machine (1) according to claim 2, characterized in that, The first end cap (24 a) and the second end cap (24 b) comprise an extension (240) extending radially beyond the intermediate section (23), The housing (20) includes a fastener (27) extending from an extension (240) of the first end cap (24 a) to an extension (240) of the second end cap (24 b) to assemble the first end cap (24 a), the second end cap (24 b), and the intermediate section (23) together.
  14. 14. An electric machine (1) according to claim 13, characterized in that, The extension portions (240) of the first end cap (24 a) and the second end cap (24 b) are each provided with a through hole (241) through which the fastener (27) passes.
  15. 15. An electric machine (1) according to claim 13, characterized in that, One of the extension portions (240) of the first and second end caps (24 a, 24 b) is provided with a through hole (241) through which the fastener (27) passes, and the other of the extension portions (240) of the first and second end caps (24 a, 24 b) is provided with a screw hole (242) through which the fastener (27) is screwed.
  16. 16. An electric machine (1) according to any one of claims 13 to 15, characterized in that, The intermediate section (23) comprises an outer groove (28) formed on a radially outer surface, the fastener (27) being at least partially accommodated in the outer groove (28).
  17. 17. An electric machine (1) according to any one of claims 13 to 15, characterized in that, The extension (240) is formed by an outer flange radially protruding from the outer walls of the first and second end caps (24 a, 24 b).
  18. 18. An electric machine (1) according to claim 2 or 3, characterized in that, The intermediate section (23) is produced by extrusion of aluminum.
  19. 19. An electric drive assembly system comprising an electric machine (1) according to any one of claims 1 to 18.
  20. 20. A vehicle comprising the electric drive train of claim 19.

Description

Motor, electric drive assembly system and vehicle Technical Field The present disclosure relates to an electric machine. The disclosure also relates to an electric drive train comprising such an electric machine and a vehicle comprising such an electric drive train. Background The electric machines used to drive vehicles typically have a large power and generate a large amount of heat during continuous operation. If the heat dissipation is insufficient, the generated heat can accumulate inside the motor, so that the temperature of the motor is increased, and the reliability and the performance of the motor are affected. The oil-cooled motor can make the cooling medium (cooling oil) directly contact with the internal components of the motor, so that the oil-cooled motor has a better cooling effect and is increasingly widely applied in the field of vehicles. The stator is one of the main heat generating components of the motor. Oil-cooled electric machines typically require a conduit or other guide to be placed inside the housing of the machine to direct the cooling medium into contact with the stator and other internal components, cooling the stator and other internal components. Such guides occupy the internal space of the motor, increase the size of the motor, and increase the component costs of the motor. Accordingly, there is a need for an electric machine that is capable of guiding a cooling medium to sufficiently cool internal components of the electric machine without increasing the size and the cost of the components. Disclosure of Invention Accordingly, the present disclosure is directed to solving the above-described problems, and an object thereof is to provide a novel electric machine, electric drive assembly system, and vehicle. The motor according to the present disclosure is capable of guiding a cooling medium to sufficiently cool components disposed inside the motor without increasing the size of the motor and the cost of the components. This object is achieved by an electric machine according to one embodiment of the present disclosure, comprising a stator and a housing, the housing comprising a housing wall defining a receiving space, the stator being received in the receiving space. The shell comprises a cooling channel and an oil spray hole, wherein the cooling channel is arranged in the shell wall, the oil spray hole is communicated with the cooling channel and the accommodating space, and cooling medium circulates in the cooling channel and is sprayed towards the stator through the oil spray hole. It is an object of the present disclosure to provide a motor capable of guiding a cooling medium to sufficiently cool components disposed inside the motor without increasing the size of the motor. The motor according to the present disclosure is provided with a cooling passage in the housing wall, and is provided with an oil jet hole communicating the cooling passage and the accommodation space. The cooling medium flowing in the cooling passage may cool a radially outer portion of the stator near the housing, and the cooling medium may be sprayed toward the stator through the oil spray holes to directly contact the stator and cool the stator. The motor according to the present disclosure achieves guiding of the cooling medium and sufficient cooling of the stator in the motor through the cooling channel and the oil spray hole provided in the wall of the housing, without providing an additional cooling medium guide inside the housing. Thus, the motor according to the present disclosure sufficiently cools the components inside the motor without increasing the size of the motor. Further, the motor according to the present disclosure reduces the cost of parts and simplifies the assembly steps since the cooling medium guide inside the housing is omitted. The motor according to the present disclosure may also have one or more of the following features, alone or in combination. According to one embodiment of the present disclosure, the housing includes a middle section, first and second end caps on either side of the middle section that axially clamp the middle section to form the housing. This three-section construction of the housing of the motor is easy to assemble and can increase the overall length by increasing the length of the intermediate section, adapting to motors of different specifications. According to one embodiment of the present disclosure, the stator comprises a stator body and winding heads extending axially beyond from both ends of the stator body, and the stator body is held within the intermediate section by press-fitting. This press-fit holding configuration of the stator body brings the stator body into close contact with the intermediate section of the housing, facilitating heat exchange between the stator body and the housing, enhancing the cooling effect of the cooling medium flowing in the cooling passage on the stator body. According to one embodiment of the present disclo