CN214755965U

CN214755965U - Stator cooling structure, driving motor and new energy automobile

Info

Publication number: CN214755965U
Application number: CN202121041790.XU
Authority: CN
Inventors: 胡余生; 张小波; 刘健宁; 高峰; 薛家宁; 赵丹丰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-11-16
Anticipated expiration: 2031-05-14

Abstract

The application provides a stator cooling structure, driving motor and new energy automobile. This stator cooling structure is used for cooling stator winding, including the motor oil inlet, inner circle oil spout structure and outer lane oil spout structure, inner circle oil spout structure sets up in stator winding's the week side of week, outer lane oil spout structure sets up the periphery side at stator winding, inner circle oil spout structure and outer lane oil spout structure all communicate with the motor oil inlet, inner circle oil spout structure includes first nozzle opening, outer lane oil spout structure includes the second nozzle opening, the opening of first nozzle opening is towards the internal perisporium of stator winding, the opening of second nozzle opening is towards the periphery wall of stator winding. According to the stator cooling structure of this application, can guarantee that the winding cooling is even, avoid the winding local temperature too high problem to appear, improve motor stability and life.

Description

Stator cooling structure, driving motor and new energy automobile

Technical Field

The application relates to the technical field of vehicles, in particular to a stator cooling structure, a driving motor and a new energy automobile.

Background

With the vigorous advocation of national policies in recent years, the field of new energy vehicles is rapidly developed, and competition in the industry is increased day by day. More and more manufacturers are focusing on the application of oil cooling technology to the main drive motor of the passenger car to improve the power density of the main drive system from the technical point of view.

In order to reduce the volume and save the cost of products of various manufacturers at the present stage, the scheme adopted is mainly to increase the rotating speed of the motor and improve the cooling condition so as to increase the power density. The increase of the rotating speed of the motor is limited by factors such as the speed ratio of a bearing, an oil seal and a matched speed reducer, and more negative effects are often generated. In the aspect of improving the cooling condition, the water cooling effect is limited, and the adoption of the filling heat conduction material to improve the heat transfer efficiency is generally limited by factors such as material cost or process complexity, and is not suitable for batch production. Therefore, at the present stage, the most effective scheme is to use an oil cooling technology, but most of the existing oil cooling schemes are complex in oil path structure, which increases the processing cost, or are unreasonable in oil path structure and limited in cooling effect, and particularly, uneven cooling is often caused for cooling the stator.

At present, new energy automobile owner drives motor at the actual motion in-process, when being in the big moment of torsion of low-speed, the stator and the rotor of main drive motor can send a large amount of heats, current new energy automobile owner drives motor's radiating mode and mostly is seting up the spiral water runner in motor housing is inside, circulation through water in the casing flows, and then realize the cooling effect of motor, there is motor winding this kind of cooling method, the bearing can't obtain direct cooling and lubrication, main drive motor's main source of generating heat can not obtain effective refrigerated problem, therefore the motor heat load is limited, and then lead to the motor volume limited.

If adopt oil cooling formula cooling, the cooling oil can be direct with each source contact that generates heat of motor to accomplish the pertinence cooling structurally, each source that generates heat of main drive motor obtains effective cooling, under the same performance requirement, traditional water cooled machine is compared to the oil-cooled motor, and the heat load obtains improving, and the motor volume can reduce, and power density then obtains improving, and the cooling oil can lubricate the cooling motor bearing simultaneously, and then the motor life-span also obtains improving.

The current motor oil cooling mode is with cooling oil direct cooling stator winding, but there is the winding cooling inhomogeneous in current oil cooling mode, leads to the too high problem of winding local temperature, influences the life of motor easily.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a stator cooling structure, driving motor and new energy automobile, can guarantee that the winding cooling is even, avoids the winding local temperature too high's problem to appear, improves motor stability and life.

In order to solve the problem, the application provides a stator cooling structure, be used for cooling stator winding, including the motor oil inlet, inner circle oil spout structure and outer lane oil spout structure, inner circle oil spout structure sets up the week side at stator winding, outer lane oil spout structure sets up the periphery side at stator winding, inner circle oil spout structure and outer lane oil spout structure all communicate with the motor oil inlet, inner circle oil spout structure includes first nozzle opening, outer lane oil spout structure includes the second nozzle opening, the opening of first nozzle opening is towards the internal perisporium of stator winding, the opening of second nozzle opening is towards the periphery wall of stator winding.

Preferably, the first oil injection hole is arranged on the outer peripheral wall of the inner ring oil injection structure and extends along the radial direction of the inner ring oil injection structure; and/or the second oil injection hole is arranged on the inner circumferential wall of the outer ring oil injection structure and extends along the radial direction of the outer ring oil injection structure.

Preferably, the number of the first oil injection holes is multiple, and the multiple first oil injection holes are uniformly distributed at intervals along the circumferential direction of the outer ring of the inner ring oil injection structure; and/or the second oil spray holes are multiple and are uniformly distributed at intervals along the circumferential direction of the inner circumference of the outer ring oil spray structure.

Preferably, the inner ring oil injection structure and the outer ring oil injection structure are arranged in groups to form an oil injection ring assembly, and the inner ring oil injection structure of the same oil injection ring assembly is located on the radial inner side of the outer ring oil injection structure.

Preferably, the number of the oil injection ring assemblies is at least two, the first end of the stator winding is correspondingly provided with at least one oil injection ring assembly, the second end of the stator winding is correspondingly provided with at least one oil injection ring assembly, and the end part of the stator winding is positioned between the inner ring oil injection structure and the outer ring oil injection structure of the oil injection ring assemblies.

Preferably, the oil injection ring assemblies at two ends of the stator winding are communicated with the oil inlet of the motor.

Preferably, the inner ring oil injection structure comprises at least two first split structures, and the at least two first split structures are sequentially connected end to end along the circumferential direction to form the inner ring oil injection structure.

Preferably, the first split structure comprises a male end located at the first end and a female end located at the second end, the male end and the female end of the adjacent first split structure are matched and fixedly connected, after the first split structure is combined, a first annular channel which is communicated along the circumferential direction is formed in the inner ring oil injection structure, and the first oil injection hole is communicated with the first annular channel.

Preferably, the male end and the female end are both arranged on the inner periphery side of the first split structure, the male end and the female end are in plug-in fit to form an inner ring mounting boss, and a first connecting hole penetrating along the axial direction is formed in the inner ring mounting boss.

Preferably, the end face of the end where the male end of the first split structure is located is provided with a first plug structure, the end face of the end where the female end of the first split structure is located is provided with a second plug structure, and the first plug structure and the second plug structure are in plug fit to form sealed connection.

Preferably, the first plug structure is a slot, the second plug structure is a plug, the first annular channel penetrates through the plug along the circumferential direction, and when the plug is in plug-in fit with the slot, the first annular channels of the adjacent first split structures are communicated with each other.

Preferably, at least one of the first split structures is provided with an inner ring oil inlet, the motor oil inlet is communicated to the inner ring oil inlet, and the inner ring oil inlet is communicated with the first annular channel.

Preferably, a first oil inlet joint is arranged at the oil inlet of the inner ring and is arranged on the axial end face of the oil injection structure of the inner ring.

Preferably, the inner ring oil injection structure is an integrally formed structure.

Preferably, the outer edge of the inner ring oil injection structure is provided with an annular convex edge extending along the axial direction of the inner ring oil injection structure, and the outer peripheral wall of the annular convex edge is flush with the outer peripheral wall of the inner ring oil injection structure.

Preferably, the outer ring oil injection structure comprises a plurality of second split structures, and the second split structures are sequentially connected end to end along the circumferential direction to form the outer ring oil injection structure.

Preferably, the second block structure comprises a male end located at the first end and a female end located at the second end, the male end and the female end of the adjacent second block structure are matched and fixedly connected, after the second block structures are combined, a second annular channel which penetrates through in the circumferential direction is formed in the outer ring oil injection structure, and the second oil injection hole is communicated with the second annular channel.

Preferably, the male end and the female end of the second block structure are both arranged on the outer peripheral side of the second block structure, the male end and the female end are in plug-in fit to form an outer ring mounting boss, and a second connecting hole penetrating along the axial direction is formed in the outer ring mounting boss.

Preferably, a radial oil inlet is formed in the peripheral wall of the at least one second split structure, the motor oil inlet is communicated with the radial oil inlet, and the radial oil inlet is communicated with the second annular channel.

Preferably, the outer ring oil injection structure is an integrally formed structure.

Preferably, an outer ring mounting boss is arranged on the outer circumferential wall of the outer ring oil injection structure, and a second connecting hole penetrating along the axial direction is formed in the outer ring mounting boss.

According to one aspect of the application, the driving motor comprises a stator winding and the stator cooling structure, wherein the stator winding is located between an inner ring oil injection structure and an outer ring oil injection structure of the stator cooling structure.

According to an aspect of the present application, there is provided a new energy automobile including the above stator cooling structure or the above driving motor.

The application provides a stator cooling structure, a be used for cooling stator winding, including the motor oil inlet, inner circle oil spout structure and outer lane oil spout structure, inner circle oil spout structure sets up the week side in stator winding, outer lane oil spout structure sets up the periphery side at stator winding, inner circle oil spout structure and outer lane oil spout structure all communicate with the motor oil inlet, inner circle oil spout structure includes first nozzle opening, outer lane oil spout structure includes the second nozzle opening, the opening of first nozzle opening is towards the internal perisporium of stator winding, the opening of second nozzle opening is towards the periphery wall of stator winding. This stator cooling structure all sets up the oil spout structure in the inside and outside of stator winding, consequently can utilize the oil spout structure to carry out the oil spout cooling from the inside and outside both sides of stator winding simultaneously for the inside and outside cooling of stator winding's tip is even, has guaranteed the refrigerated homogeneity of stator winding, can effectively avoid the too high problem of local temperature that stator winding cooling is inhomogeneous to result in, the life of extension motor.

Drawings

FIG. 1 is a schematic cross-sectional view of a drive motor according to the present application;

FIG. 2 is an enlarged schematic view of FIG. 1 at L;

FIG. 3 is an enlarged schematic view of the structure at M of FIG. 1;

fig. 4 is a flow chart of a stator cooling structure of a driving motor according to an embodiment of the present application;

fig. 5 is a perspective view illustrating an outer ring fuel injection structure of a driving motor according to an embodiment of the present application;

fig. 6 is a perspective view illustrating an inner race fuel injection structure of a driving motor according to an embodiment of the present application;

FIG. 7 is an exploded view of a drive motor according to the present application;

fig. 8 is a perspective view illustrating an outer ring fuel injection structure of a driving motor according to an embodiment of the present application;

fig. 9 is a perspective view illustrating an inner race fuel injection structure of a driving motor according to an embodiment of the present application;

FIG. 10 is a front bearing cooling block diagram of a drive motor according to one embodiment of the present application;

FIG. 11 is a schematic view of a housing structure of a driving motor according to an embodiment of the present application;

fig. 12 is a schematic perspective view of a front end cover of a driving motor according to an embodiment of the present application;

FIG. 13 is a view illustrating an assembly structure of a front cover and a front inner race oil injection structure of a driving motor according to an embodiment of the present application;

FIG. 14 is a schematic view of an assembly structure of a rear outer ring fuel injection structure and a housing of a driving motor according to an embodiment of the present application;

fig. 15 is a sectional structure view of a T-shaped communication pipe of a driving motor according to an embodiment of the present application;

fig. 16 is a perspective view illustrating an outer ring fuel injection structure of a driving motor according to an embodiment of the present application;

FIG. 17 is a schematic diagram illustrating an expanded configuration of orifice locations of a front outer ring fuel injection configuration of a drive motor in accordance with an embodiment of the present application;

FIG. 18 is a schematic view illustrating an expanded structure of the nozzle positions of the rear-outer-ring fuel injection structure of the driving motor according to an embodiment of the present application;

fig. 19 is a cooling flow path oil circuit circulation structure diagram of a drive motor according to an embodiment of the present application.

The reference numerals are represented as:

1. a motor spindle; 2. a bearing; 3. a bearing steel sleeve; 4. a rear bearing runner; 5. a first axial flow passage; 6. the rear inner ring is of an oil injection structure; 7. a first axial fuel injection hole; 8. a first radial flow passage; 9. an oil inlet of the motor; 10. a first oil jet hole; 11. a rear end cap; 12. a rear T-shaped communicating pipe; 13. a second axial flow passage; 14. The rear outer ring is of an oil injection structure; 15. a second radial flow passage; 16. a stator winding; 17. a stator core; 18. a casing flow channel; 19. a housing; 20. a rotor core; 21. a third axial flow passage; 22. a third radial flow passage; 23. A front outer ring oil injection structure; 24. a front T-shaped communicating pipe; 25. a fourth radial flow passage; 26. a front end cover; 27. A rotor baffle; 28. a fourth axial flow passage; 29. the front inner ring is of an oil injection structure; 30. an oil seal cover plate; 31. oil sealing; 32. a second axial fuel injection hole; 33. an inner ring oil inlet; 34. an outer ring oil inlet; 35. a seal ring; 36. A front bearing runner; 37. a boss is arranged on the outer ring; 38. the inner ring is provided with a boss; 39. an outer ring mounting seat; 40. A casing oil sump; 41. a water inlet; 42. a water outlet; 43. an inner ring mounting seat; 44. an end cover oil collecting tank; 45. a second oil jet hole; 46. a main oil injection hole; 47. an auxiliary oil spout hole; 48. a protrusion; 49. a first annular channel; 50. a second annular channel; 51. a male end; 52. a female end; 53. a first plug-in structure; 54. a second plug-in structure; 55. an oil guide plate; 56. and an oil guide channel.

Detailed Description

Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, the stator cooling structure is configured to cool the stator winding 16, the stator cooling structure includes a motor oil inlet 9, an inner ring oil injection structure and an outer ring oil injection structure, the inner ring oil injection structure is disposed on an inner circumferential side of the stator winding 16, the outer ring oil injection structure is disposed on an outer circumferential side of the stator winding 16, both the inner ring oil injection structure and the outer ring oil injection structure are communicated with the motor oil inlet 9, the inner ring oil injection structure includes a first oil injection hole 10, the outer ring oil injection structure includes a second oil injection hole 45, an opening of the first oil injection hole 10 faces an inner circumferential wall of the stator winding 16, and an opening of the second oil injection hole 45 faces an outer circumferential wall of the stator winding 16.

This stator cooling structure all sets up the oil spout structure in stator winding 16's the inside and outside, consequently can utilize the oil spout structure to carry out the oil spout cooling from stator winding 16's inside and outside both sides simultaneously for the inside and outside cooling of stator winding 16's end winding is even, has guaranteed the refrigerated homogeneity of stator winding 16, can effectively avoid the too high problem of local temperature that stator winding 16 cooling is inhomogeneous to result in, reduces the inside heat island effect of motor, thereby improves the stability and the life of motor.

The stator cooling structure of the embodiment of the application has the advantages that the inner ring oil injection structure and the outer ring oil injection structure are added in the space between the stator winding 16 and the shell 19 inside the motor and between the stator winding 16 and the motor spindle 1, so that the cooling structure of the stator winding 16 can be arranged by fully utilizing the inner space of the motor, the size of the motor is prevented from being additionally increased, the stator winding 16 is effectively cooled, and the internal cooling performance of the motor is improved.

In one embodiment, the first oil injection holes 10 are arranged on the outer peripheral wall of the inner ring oil injection structure and extend in the radial direction of the inner ring oil injection structure, and the stator winding 16 is located on the outer peripheral side of the inner ring oil injection structure, so that the first oil injection holes 10 extend in the radial direction of the inner ring oil injection structure, and when a plurality of first oil injection holes 10 are arranged in the circumferential direction of the outer peripheral wall of the inner ring oil injection structure, the injection position of each first oil injection hole 10 on the inner peripheral wall of the stator winding 16 is more accurate, accurate distribution of cooling oil is more convenient, and oil cooling efficiency is improved.

In one embodiment, the arrangement of the first oil injection hole 10 may be considered from other injection angles, for example, from the injection area of the cooling oil on the stator winding 16, the first oil injection hole 10 may be arranged obliquely with respect to the central axis of the stator core 17, so that when the cooling oil of the first oil injection hole 10 is injected on the inner surface of the stator winding 16, a certain lateral component force may be formed, so that the cooling oil may spread out a certain area in the axial direction, the contact area of the cooling oil and the stator winding 16 is increased, and the cooling efficiency of the cooling oil on the stator winding 16 is further improved. When a plurality of first nozzle openings 10 were arranged along inner circle oil spout structure's circumference interval, first nozzle openings 10 divide into two sets ofly, a set of first nozzle openings 10 inclines towards the first end of inner circle oil spout structure, another group of first nozzle openings 10 inclines towards the second end of inner circle oil spout structure, two sets of first nozzle openings 10 are arranged along circumference in turn, thereby make stator winding 16's end winding can both fully contact with the coolant oil along whole axial direction, thereby maximize the area of contact between coolant oil and the stator winding 16, improve the cooling effect of coolant oil to stator winding 16.

In one embodiment, as a modification to the previous embodiment, a set of first oil injection holes 10 extending in the radial direction and perpendicular to the central axis of the stator core 17 may be added to form three sets of first oil injection holes 10, and the three sets of first oil injection holes 10 are alternately arranged in the circumferential direction, so that the cooling oil can more completely cover the stator winding 16.

The inner ring oil injection structure can be an annular structure or a semi-ring structure, when the inner ring oil injection structure is the semi-ring structure, the inner ring oil injection structure is arranged above the motor spindle 1, and cooling oil sprayed by the inner ring oil injection structure can flow downwards along the inner wall surface of the stator winding 16 when reaching the inner wall surface of the stator winding 16, so that the cooling oil is distributed on the inner wall surface of the whole stator winding 16 under the action of gravity, and a comprehensive cooling effect is formed on the stator winding 16. Therefore, the inner ring of the stator winding 16 can be effectively cooled regardless of the inner ring oil injection structure of the annular structure or the inner ring oil injection structure of the semi-ring structure, and the inner ring oil injection structure of the semi-ring structure uses less materials and has lower cost.

In addition, since the cooling oil flows downward along the inner wall surface of the stator winding 16 by gravity, the dwell time at the top is short, so that when the first oil injection holes 10 on the inner ring oil injection structure are uniformly arranged along the circumferential direction, the cooling oil at the bottom of the stator winding 16 is enriched, the cooling oil at the top is slightly insufficient, and after the inner ring oil injection structure of the semi-ring structure is adopted, under the same amount of cooling oil, the cooling oil flows to the top of the inner ring of the stator winding 16 more intensively, so that more cooling oil can be cooled at the top of the inner ring of the stator winding 16, thereby improving the cooling effect of the top winding of the stator winding 16, and simultaneously, during the process that the cooling oil flows downwards along the top of the stator winding 16, the lower stator winding 16 can be cooled effectively, and the cooling effect of the cooling oil on the stator winding 16 can be improved as a whole.

In one embodiment, the second oil injection holes 45 are arranged on the inner peripheral wall of the outer ring oil injection structure and extend in the radial direction of the outer ring oil injection structure, and the stator winding 16 is positioned on the inner peripheral side of the outer ring oil injection structure, so that the second oil injection holes 45 extend in the radial direction of the outer ring oil injection structure, and when a plurality of second oil injection holes 45 are arranged in the circumferential direction of the inner peripheral wall of the outer ring oil injection structure, the injection position of each second oil injection hole 45 on the outer peripheral wall of the stator winding 16 is more accurate, accurate distribution of cooling oil is more convenient, and oil cooling efficiency is improved.

In one embodiment, the arrangement of the second oil injection hole 45 may be considered from other injection angles, for example, from the injection area of the cooling oil on the stator winding 16, the second oil injection hole 45 may be arranged obliquely with respect to the central axis of the stator core 17, so that when the cooling oil of the second oil injection hole 45 is injected on the outer surface of the stator winding 16, a certain lateral component force may be formed, so that the cooling oil can spread out a certain area in the axial direction, the contact area of the cooling oil and the stator winding 16 is increased, and the cooling efficiency of the cooling oil on the stator winding 16 is further improved. When a plurality of second nozzle opening 45 arranged along outer lane oil spout structure's circumference interval, second nozzle opening 45 divide into two sets ofly, a set of second nozzle opening 45 inclines towards outer lane oil spout structure's first end, another set of second nozzle opening 45 inclines towards outer lane oil spout structure's second end, two sets of second nozzle opening 45 arrange along circumference in turn, thereby make stator winding 16's end winding can both fully contact with the coolant oil along whole axial direction, thereby maximize area of contact between coolant oil and the stator winding 16, improve the cooling effect of coolant oil to stator winding 16.

In one embodiment, as a modification to the previous embodiment, a set of second oil injection holes 45 extending in the radial direction and perpendicular to the central axis of the stator core 17 may be added to form three sets of second oil injection holes 45, and the three sets of second oil injection holes 45 are alternately arranged in the circumferential direction, so that the cooling oil can more completely cover the stator winding 16.

The outer lane oil spout structure can be the loop configuration, also can be the semi-ring structure, and when the outer lane oil spout structure was the semi-ring structure, the setting of outer lane oil spout structure was in motor spindle 1's top, and outer lane oil spout structure spun cooling oil can flow downwards along the outer wall face of stator winding 16 when arriving stator winding 16's outer wall face to distribute whole stator winding 16's outer wall face under the effect of gravity, form comprehensive cooling effect to stator winding 16. Therefore, no matter the outer ring oil injection structure of the annular structure or the outer ring oil injection structure of the semi-ring structure, the effective cooling of the outer ring of the stator winding 16 can be realized, and the outer ring oil injection structure of the semi-ring structure uses less materials and has lower cost.

In addition, since the cooling oil flows downward along the outer wall surface of the stator winding 16 by gravity, the residence time is short at the top, therefore, when the second oil spray holes 45 on the outer ring oil spray structure are uniformly distributed along the circumferential direction, the cooling oil at the bottom of the stator winding 16 is enriched, the cooling oil at the top is slightly insufficient, and after the outer ring oil injection structure of the semi-ring structure is adopted, under the same cooling oil quantity, the cooling oil flows to the top of the outer ring of the stator winding 16 more intensively, so that more cooling oil can be cooled at the top of the outer ring of the stator winding 16, thereby improving the cooling effect of the top winding of the stator winding 16, and simultaneously, during the process that the cooling oil flows downwards along the top of the stator winding 16, the lower stator winding 16 can be cooled effectively, and the cooling effect of the cooling oil on the stator winding 16 can be improved as a whole.

In one embodiment, the number of the first oil injection holes 10 is multiple, and the multiple first oil injection holes 10 are uniformly arranged at intervals along the circumferential direction of the inner ring oil injection structure, so that the oil injection distribution uniformity of the first oil injection holes 10 on the stator winding 16 can be improved.

In one embodiment, the number of the second oil injection holes 45 is multiple, and the multiple second oil injection holes 45 are uniformly arranged at intervals along the inner circumferential direction of the outer ring oil injection structure, so that the oil injection distribution uniformity of the second oil injection holes 45 on the stator winding 16 can be improved.

In one embodiment, the inner and outer ring fuel injection structures are arranged in groups to form a fuel injection ring assembly, the inner ring fuel injection structure of the same fuel injection ring assembly being located radially inwardly of the outer ring fuel injection structure. Form oil spout cooling space between inner circle oil spout structure and the outer lane oil spout structure, stator winding 16's end winding sets up in this oil spout cooling space, consequently can receive the oil spout cooling of inner circle oil spout structure and outer lane oil spout structure simultaneously, not only can form the cooling oil from the circumferential direction, can also form the cooling oil from inside and outside both sides, can make the cooling target of cooling oil more clear and definite, the cooling zone is more concentrated, the cooling efficiency of cooling oil is higher, form the concentrated cooling to stator winding 16, the realization is to the concentrated cooling of the inside big heat source that generates heat of motor, the utilization efficiency of cooling oil is higher. The end winding of the stator winding 16 refers to a winding portion of the stator winding 16 that protrudes out of both ends of the stator core 17.

When the inner ring oil injection structure and the outer ring oil injection structure are designed, the outer diameter of the inner ring oil injection structure and the inner diameter of the outer ring oil injection structure need to be reasonably designed to ensure that cooling oil sprayed out of an oil injection hole can reach the surface of the stator winding 16 to cool the stator winding 16, because the stator winding 16 is positioned at the inner side of the outer ring oil injection structure and at the outer side of the inner ring oil injection structure, the cooling oil at the top of the outer ring oil injection structure can flow to the surface of the stator winding 16 under the action of gravity, and if the cooling oil sprayed out of the inner ring oil injection structure is too far away from the stator winding 16 or the injection pressure is insufficient, the cooling oil of the inner ring oil injection structure can not reach the stator winding 16 to cool the stator winding 16, so that the distance between the inner ring oil injection structure and the stator winding 16 is smaller than the distance between the outer ring oil injection structure and the stator winding 16 under the same cooling oil pressure, as a preferred embodiment, the distance between the inner ring oil injection structure and the stator winding 16 is L1, the distance between the outer ring oil injection structure and the stator winding 16 is L2, wherein L1 is not more than 0.9L2, so that reasonable distribution of the distances between the outer ring oil injection structure and the stator winding 16 and the distances between the inner ring oil injection structure and the stator winding 16 can be realized while the oil injection cooling space is reasonably designed, and the cooling oil in the inner ring oil injection structure can be ensured to be injected to the surface of the stator winding 16, thereby effectively cooling the stator winding 16.

In order to further ensure the cooling effect of the inner ring oil injection structure on the stator winding 16, the distance between the inner ring oil injection structure and the stator winding 16 needs to be further designed according to the pressure of cooling oil, so that the cooling oil injected from the first oil injection hole 10 at the top of the inner ring oil injection structure can form a sputtering effect on the surface of the stator winding 16, the distribution area of the cooling oil after reaching the surface of the stator winding 16 is further increased, and the heat exchange efficiency of the cooling oil and the stator winding 16 is improved.

In one embodiment, since the stator winding 16 includes the end winding at the front end and the end winding at the rear end, there are at least two oil injection ring assemblies, the first end, i.e., the rear end, of the stator winding 16 is correspondingly provided with at least one oil injection ring assembly, the second end, i.e., the front end, of the stator winding 16 is correspondingly provided with at least one oil injection ring assembly, and the end winding of the stator winding 16 is located between the inner ring oil injection structure and the outer ring oil injection structure of the oil injection ring assemblies, so that the inner ring oil injection structure and the outer ring oil injection structure are both arranged at the front end winding and the rear end winding of the stator winding 16 for oil injection cooling, and therefore, the inside and outside and circumferential cooling of the two ends of the stator winding 16 can be simultaneously performed, and the cooling efficiency and the cooling effect of the stator winding 16 can be further improved.

In one embodiment, the oil injection ring assemblies at two ends of the stator winding 16 are both communicated with the motor oil inlet 9, so that oil supply of the oil injection ring assemblies at two ends of the stator winding 16 can be realized only by one motor oil inlet 9, the structure is simpler, and the realization is more convenient.

In an embodiment, two motor oil inlets 9 may also be arranged in parallel, one motor oil inlet 9 is communicated with the oil injection ring assembly at the rear end of the motor, the other motor oil inlet 9 is communicated with the oil injection ring assembly at the front end of the motor, oil can be directly supplied to each oil injection ring assembly through the two motor oil inlets 9, and the oil supply amount and the oil supply pressure of each oil injection ring assembly can be ensured.

In one embodiment, the outer ring oil injection structure is used for cooling the outer ring of the stator winding 16, and the outer ring oil injection structure includes a body, a channel extending along the circumferential direction is arranged in the body, a second oil injection hole 45 is arranged on the inner wall surface of the body, the second oil injection hole 45 is communicated with the channel corresponding to the second oil injection hole 45, and the second oil injection holes 45 are circumferentially arranged along the inner wall surface of the body. The plurality of channels may be arranged at intervals along the circumferential direction of the body, and may also communicate in the circumferential direction.

The second oil spout hole 45 of this outer lane oil spout structure arranges along the internal face circumference of body, can cool off stator winding 16 outer lane along the circumferential direction, consequently can be so that stator winding 16's cooling is even, avoids stator winding 16 to appear the too high problem of local temperature, improves motor stability and life.

In one embodiment, the second oil jet 45 includes a main oil jet 46 and an auxiliary oil jet 47, the main oil jet 46 is circumferentially arranged in a straight line direction on a development of an inner wall surface of the body, at least a part of the auxiliary oil jet 47 is disposed on a peripheral side of the main oil jet 46 at a top of the body, and the main oil jet 46 is disposed at an intermediate position of the inner wall surface in an axial direction. In this embodiment, the main oil injection hole 46 is a basic oil injection hole disposed at the middle position of the body in the axial direction, the auxiliary oil injection hole 47 is designed around the main oil injection hole 46 according to the heating position of the stator winding 16 and the shape structure of the stator winding 16, the main oil injection hole 46 can be used to meet the basic oil supply requirement of the stator winding 16, and the auxiliary oil injection hole 47 is used to supply oil in a targeted manner according to the characteristics of the stator winding 16, so that the oil supply of the stator winding 16 can be matched with the structure and the heating characteristics of the stator winding 16, the stator winding 16 is uniformly cooled, and the cooling effect and the cooling efficiency of the stator winding 16 are improved.

In one embodiment, the main oil injection holes 46 are uniformly distributed along the circumferential direction of the inner wall surface of the main body, and the main oil injection holes 46 are only used for meeting the basic oil supply requirements of all the positions of the stator winding 16, so that more main oil injection holes 46 need to be distributed to uniformly supply oil to all the positions of the stator winding 16, and the oil supply of the important region of the stator winding 16 needs to be realized through the auxiliary oil injection hole 47, so that after the functions of the oil injection holes are divided, the structural design and the position design of the oil injection hole are more clear, the design difficulty is greatly reduced, after the main oil injection holes 46 meet the design requirements, the precise design of the auxiliary oil injection hole 47 can be performed according to the self characteristics and the heating position of the stator winding 16, and the auxiliary oil injection hole 47 is used for realizing the targeted cooling.

In one embodiment, the outer ring oil injection structure is divided into a front outer ring oil injection structure 23 and a rear outer ring oil injection structure 14 according to different installation positions, the motor oil inlet 9 simultaneously supplies oil to the two outer ring oil injection structures, and the motor oil inlet 9 is arranged at the rear end of the motor, in this case, since the front outer ring oil injection structure 23 is farther from the motor oil inlet 9, the pressure loss is larger, compared to the rear outer ring oil injection structure 14, under the condition that the oil injection hole areas are the same, the oil supply pressure and the oil supply amount of the front outer ring oil injection structure 23 are smaller than those of the rear outer ring oil injection structure 14, therefore, in order to ensure the consistency of the oil supply amounts of the front outer ring oil injection structure 23 and the rear outer ring oil injection structure 14, the total area of the second oil injection holes 45 of the front outer ring oil injection structure 23 is larger than that of the second oil injection holes 45 of the rear outer ring oil injection structure 14, so as to compensate for the insufficient oil amount by using the oil injection area, the oil supply consistency of the oil injection structures of the front and rear outer rings is realized.

The structures of the rear-outer-ring oil spout structure 14 and the front-outer-ring oil spout structure 23 will be described below, respectively.

In one embodiment, at least one side of the main oil injection hole 46 of the rear-outer-ring oil injection structure 14 at the top in the circumferential direction is provided with an auxiliary oil injection hole 47. As a preferred embodiment, auxiliary oil jet holes 47 are provided on both circumferential sides of the main oil jet hole 46 at the top, respectively.

For the rear outer ring oil injection structure 14, because the heat productivity of the top of the stator winding 16 is the largest in the whole stator winding 16, and the retention time of the cooling oil on the top of the stator winding 16 is short, if the oil quantity is insufficient, the top position of the stator winding 16 with the largest heat productivity cannot be sufficiently and effectively cooled, so that the problem that the local temperature of the top of the stator winding 16 is still high easily occurs, therefore, the position of the rear outer ring oil injection structure 14 corresponding to the stator winding 16 needs to be modified, the number of the second oil injection holes 45 in the region is increased, so that the cooling oil can cool the top position of the outer ring of the stator winding 16 greatly and continuously, and the cooling of the large heat productivity of the top of the stator winding 16 is realized by increasing the oil supply quantity of the top coil of the stator winding 16. In this embodiment, by increasing the auxiliary oil injection holes 47 on both sides of the circumferential direction of the main oil injection hole 46 on the top, the area of the oil injection hole on the top of the rear outer ring oil injection structure 14 is increased, the amount of oil supplied to the top of the stator winding 16 is increased, and by increasing the plurality of auxiliary oil injection holes 47 on the periphery of the main oil injection hole 46 on the top in a targeted manner, the top of the stator winding 16 is intensively cooled, and the cooling effect on the top of the stator winding 16 is ensured.

At least two auxiliary oil spray holes 47 are respectively arranged on two sides of the circumference of the main oil spray hole 46 positioned at the top, and in the auxiliary oil spray holes 47 positioned between the main oil spray hole 46 positioned at the top and the adjacent main oil spray hole 46, the auxiliary oil spray hole 47 close to the adjacent main oil spray hole 46 is positioned at the middle position of the main oil spray hole 46 positioned at the top and the adjacent main oil spray hole 46. In this embodiment, the number of the auxiliary oil injection holes 47 between the main oil injection hole 46 at the top and the adjacent main oil injection holes 46 at both sides is two, so that it is equivalent to that four auxiliary oil injection holes 47 are provided at the top on the periphery side of the main oil injection hole 46, thereby greatly increasing the area of the oil injection hole corresponding to the top area of the stator winding 16, increasing the oil injection amount, and realizing effective cooling of the top of the stator winding 16. The auxiliary oil spray holes 47 close to the adjacent main oil spray holes 46 are located in the middle of the main oil spray hole 46 at the top and the adjacent main oil spray hole 46, and the two auxiliary oil spray holes 47 located on one side of the main oil spray hole 46 at the top are uniformly arranged at intervals, so that the auxiliary oil spray holes 47 can be uniformly distributed on two sides of the main oil spray hole 46 at the top, and uniform oil supply of different areas at the top of the stator winding 16 is realized.

In one embodiment, the main spray hole 46 adjacent to the top main spray hole 46 is provided with an auxiliary spray hole 47 on a side away from the top main spray hole 46.

As a preferred embodiment, the number of the auxiliary oil jet holes 47 provided on the side of the main oil jet hole 46 away from the top is two, and are respectively provided on both sides of the center line of the adjacent main oil jet holes 46.

In this embodiment, the main oil hole 46 adjacent to the top main oil hole 46 is a first adjacent main oil hole 46, the main oil hole 46 adjacent to the first adjacent main oil hole 46 is a second adjacent main oil hole 46, two auxiliary oil injection holes 47 are arranged between the first adjacent main oil hole 46 and the second adjacent main oil hole 46, the two auxiliary oil injection holes 47 are axially arranged and are respectively located on two sides of a central connecting line of the first adjacent main oil hole 46 and the second adjacent main oil hole 46, and the main oil injection holes are mainly used for realizing oil supplement in the region. Because the influence of the winding shape of the stator winding 16 and the characteristic that the stator winding 16 is of a cylindrical structure, when cooling oil flows downwards from the top of the stator winding 16 under the action of gravity, the problem that the cooling oil is concentrated towards the axial middle position may occur, and the cooling oil at the two ends of the end winding at the rear end of the stator winding 16 cannot reach, so that the two ends of the end winding cannot be cooled, therefore, an auxiliary oil injection hole 47 is added in the middle area where the cooling oil flows downwards, and the auxiliary oil injection hole 47 is respectively arranged corresponding to the two ends of the end winding, so that the oil supplement to the end winding can be realized, the cooling oil can be redistributed to the two end areas of the end winding at the position, and then flows downwards from the area, and the purpose of effectively cooling each area at the end of the stator winding 16 is achieved.

In order to further improve the cooling effect of the stator winding 16, the end winding at the rear end of the stator winding 16 has a large amount of heat, and the amount of heat is reflected in the entire axial direction, and therefore, in one embodiment, auxiliary oil injection holes 47 are respectively provided at both axial sides of the main oil injection hole 46 located at the top. In this embodiment, the auxiliary oil injection holes 47 are simultaneously disposed on two axial sides of the main oil injection hole 46 at the top, and in combination with the four oil injection holes disposed on two circumferential sides before combination, six auxiliary oil injection holes 47 are disposed on the periphery side of the main oil injection hole 46 at the top, so that oil can be supplemented to both the axial direction and the circumferential direction of the top of the stator winding 16, the oil injection holes in the top area can be uniformly distributed to the coil heat source, and the cooling effect is optimal.

In one embodiment, the body is provided with an outer ring oil inlet 34, the outer ring oil inlet 34 is positioned on one side of the top main oil spray hole 46 in the circumferential direction, and the number of the auxiliary oil spray holes 47 on the side of the outer ring oil inlet 34 is less than the number of the auxiliary oil spray holes 47 on the other side of the top main oil spray hole 46 in the circumferential direction.

In one embodiment, an auxiliary oil injection hole 47 is arranged between at least part of the adjacent main oil injection holes 46 at the side of the top main oil injection hole 46 where the outer ring oil inlet 34 is arranged, and the auxiliary oil injection hole 47 is arranged at the side of the main oil injection hole 46 far away from the outer edge of the stator winding 16.

The outer ring oil injection structure is a whole ring or semi-ring structure.

When the outer ring oil injection structure is a whole ring, the adjacent channels are communicated along the circumferential direction to form a second annular channel 50 which is communicated along the circumferential direction.

In one embodiment, at least one side of the main oil injection hole 46 of the front-outer ring oil injection structure 23 at the top in the circumferential direction is provided with an auxiliary oil injection hole 47. As a preferred embodiment, auxiliary oil jet holes 47 are provided on both circumferential sides of the main oil jet hole 46 at the top, respectively.

The front-outer-ring oil injection structure 23 has substantially the same structure as the rear-outer-ring oil injection structure 14, except that the number and arrangement positions of the second oil injection holes 45 are different.

In one embodiment, the front-outer-ring oil injection structure 23 is provided with an auxiliary oil injection hole 47 on one side in the axial direction of the main oil injection hole 46 at the top. For the front outer ring oil injection structure 23, because the heat productivity of the front end winding of the stator winding 16 is smaller than that of the rear end winding, fewer auxiliary oil injection holes 47 can be arranged on the periphery of the main oil injection hole 46 at the top compared with the rear outer ring oil injection structure 14, so that the number and the position distribution of the auxiliary oil injection holes 47 of the front outer ring oil injection structure 23 are more matched with the heat productivity of the front end winding of the stator winding 16, and the cooling uniformity of the front end winding of the stator winding 16 is improved.

In one embodiment, see table below:

it can be seen from the table that, compared with the whole ring structure, the half ring structure has fewer materials and lower cost, and also effectively controls the highest temperature of the coil winding, the highest temperature of the coil winding is reduced by at least 7 ℃, the percentage of reduction is at least 7%, the temperature distribution uniformity of the coil winding is effectively improved, especially for the front outer ring oil injection ring structure, after the half ring structure is adopted, the highest temperature is reduced by 28.6%, the average temperature is reduced by 17.0%, so that the highest temperature and the average temperature of the coil winding corresponding to the front outer ring oil injection ring are both greatly reduced, and a more effective cooling effect is achieved for the coil winding.

In one embodiment, the body is provided with an outer ring oil inlet 34, the outer ring oil inlet 34 is positioned on one side of the top main oil spray hole 46 in the circumferential direction, and the number of the auxiliary oil spray holes 47 on the side of the outer ring oil inlet 34 is less than the number of the auxiliary oil spray holes 47 on the other side of the top main oil spray hole 46 in the circumferential direction. Due to the existence of the outer ring oil inlet 34, the main oil injection hole 46 and the auxiliary oil injection hole 47 which are positioned on the same side of the outer ring oil inlet 34 can have larger injection pressure and injection flow, so that the cooling oil distribution on the two circumferential sides of the main oil injection hole 46 on the top is more uniform, and the consistency of the cooling oil supply on the two circumferential sides of the main oil injection hole 46 on the top can be realized by adjusting the number of the auxiliary oil injection holes 47 on the two circumferential sides of the main oil injection hole 46 on the top.

In one embodiment, an auxiliary oil injection hole 47 is arranged between at least part of the adjacent main oil injection holes 46 at the side of the top main oil injection hole 46 where the outer ring oil inlet 34 is arranged, and the auxiliary oil injection hole 47 is arranged at the side of the main oil injection hole 46 far away from the outer edge of the stator winding 16. For the stator winding 16, the height of the coil at the outer edge of the end winding at the top position is higher than the height of the coil at the inner edge of the end winding, therefore, the coil height of the outer edge of the end winding in the region below the middle position is lower than the coil height of the inner edge of the end winding, and the auxiliary oil jet hole 47 is provided on the side of the main oil jet hole 46 away from the outer edge of the stator winding 16, so that it is close to the inner edge of the end winding, when the cooling oil flows downwards under the action of gravity, the cooling oil flows from the inner edge of the end winding at a higher position to the outer edge of the end winding at a lower position, therefore, the cooling of the end winding of the whole stator winding 16 can be realized only by supplementing oil on one axial side of the stator winding 16, the design of the auxiliary oil spray hole 47 is matched with the structure of the motor winding, the cooling effect on the stator winding 16 is better, and the utilization efficiency of the cooling oil is higher.

In this embodiment, on the side of the main oil nozzle 46 at the top away from the outer ring oil inlet 34, two auxiliary oil nozzles 47 are disposed between the first adjacent main oil nozzle 46 and the second adjacent main oil nozzle 46, and the two auxiliary oil nozzles 47 are axially arranged and located on two sides of a central connecting line between the first adjacent main oil nozzle 46 and the second adjacent main oil nozzle 46, and mainly function to supplement oil in this region. Two auxiliary oil injection holes 47 are arranged between the second adjacent main oil injection hole 46 and the third adjacent main oil injection hole 46, the two auxiliary oil injection holes 47 are arranged along the axial direction and are respectively positioned at two sides of the central connecting line of the second adjacent main oil injection hole 46 and the third adjacent main oil injection hole 46, and the main function of the auxiliary oil injection holes is to realize oil supplement in the area. For this side, since the distance from the outer ring oil inlet 34 is far, the oil supply amount is small, and the oil supply amount needs to be supplemented by more auxiliary oil injection holes 47, so that the oil supply amounts on both sides of the main oil injection hole 46 at the top are consistent, and the requirement of uniform cooling of the front end winding of the stator winding 16 is met.

In one embodiment, the second oil injection holes 45 on the two sides of the main oil injection hole 46 at the top in the circumferential direction can also adopt a symmetrical structure, and the cooling effect on the end winding at the front end of the stator winding 16 can also be realized.

In one embodiment, the inner ring oil injection structure is made of a plastic material, such as PA, PP, ABS, and the like.

In one embodiment, the inner ring oil injection structure comprises at least two first split structures, and the at least two first split structures are sequentially connected end to end along the circumferential direction to form the inner ring oil injection structure. The inner ring oil injection structure adopts a split structure, so that the forming difficulty of the inner ring oil injection structure can be reduced, the design and the processing of an internal oil circuit structure of the inner ring oil injection structure are facilitated, the processing efficiency is improved, and the processing cost is reduced.

The first split structure comprises a male end 51 located at the first end and a female end 52 located at the second end, the male end 51 and the female end 52 of the adjacent first split structure are matched and fixedly connected, after the first split structure is combined, a first annular channel 49 which penetrates through in the circumferential direction is formed in the inner ring oil injection structure, and the first oil injection hole 10 is communicated with the first annular channel 49. Two adjacent first components of a whole that can function independently realize connecting through public end 51 and female end 52 between two adjacent first components of a whole that can function independently, in order to guarantee sealed effect, be provided with sealing washer 35 between two adjacent first components of a whole that can function independently, all first components of a whole that can function independently arrange and end to end along circumference, make up the inner circle oil spout structure that forms the circularity. Inside the formation annular through-type fluid region through first annular passage 49 of inner circle oil spout structure, a plurality of first nozzle opening 10 have been seted up to inner circle oil spout structure outer lane, each first nozzle opening 10 all communicates with first annular passage 49 to carry out the coolant oil distribution through first annular passage 49, after the coolant oil entered into the inner circle oil spout structure inside from inner ring oil inlet 33, the coolant oil can be followed first nozzle opening 10 and radially spout to the end winding of stator winding 16 inboard, cool off stator winding 16 end winding.

In one embodiment, the male end 51 and the female end 52 are both disposed on the inner peripheral side of the first split structure, the male end 51 and the female end 52 are in plug-in fit to form the inner ring mounting boss 38, and the inner ring mounting boss 38 is provided with a first connecting hole penetrating in the axial direction. The front end cover 26 and the rear end cover 11 of the motor are respectively provided with a mounting structure matched with the inner ring oil injection structure, the mounting structure is provided with a mounting hole extending along the axial direction, the first connecting hole and the mounting hole are correspondingly arranged, the inner ring oil injection structure is matched with the mounting hole in the mounting structure through the first connecting hole in the inner ring mounting boss 38 and is connected through a bolt, and the mounting fixation of the inner ring oil injection structure on the front end cover 26 and the rear end cover 11 is realized. The height of the inner ring mounting boss 38 controls the relative position of the inner ring oil spray structure with respect to the end windings of the stator windings 16 to achieve an optimum cooling position.

In one embodiment, the structure of the female end 52 includes two oppositely disposed protruding plates, a slot is formed between the two protruding plates, the structure of the male end 51 includes a protruding block, the protruding block is disposed corresponding to the slot between the two protruding plates, after the protruding block is inserted into the slot, the first connection holes on the male end 51 and the female end 52 are aligned, and can be fixedly connected with the mounting structure through bolts, so as to realize the fixed assembly of the inner ring oil injection structure, and simultaneously, the fixed mounting of the inner ring oil injection structure on the front end cover 26 and the rear end cover 11 can be realized.

In one embodiment, the end face of the first split structure at the male end 51 is provided with a first plug structure 53, the end face of the first split structure at the female end 52 is provided with a second plug structure 54, and the first plug structure 53 and the second plug structure 54 are plugged and matched to form a sealed connection. Through set up first grafting structure 53 on an terminal surface of first components of a whole that can function independently, set up second grafting structure 54 on another terminal surface, can realize the grafting cooperation between two adjacent first components of a whole that can function independently, can utilize the grafting cooperation between first grafting structure 53 and the second grafting structure 54 to improve the sealing performance of adjacent first components of a whole that can function independently in hookup location department. In order to improve the sealing reliability when connecting adjacent first split structures, a sealing ring 35 or the like may be provided at the mating position of the two plug structures.

In one embodiment, the first plug structure 53 is a socket, such as a cylindrical groove, the second plug structure 54 is a plug, such as a cylindrical head matching the cylindrical groove, the first annular channel 49 extends circumferentially through the plug, and when the plug is matched with the socket, the first annular channels 49 of the adjacent first split structures are communicated with each other. Because the cylindrical groove and the cylindrical head have a longer matching length, the sealing ring 35 is more conveniently arranged between the groove wall of the cylindrical groove and the outer wall of the cylindrical head to form sealing. After the seal is formed by the plugging engagement of the first plug structure 53 and the second plug structure 54, the fixed connection and the sealing function between the adjacent first split structures are separately arranged, the fixed connection is realized by the male end 51 and the female end 52, the sealing is realized by the insertion fit of the first insertion structure 53 and the second insertion structure 54, therefore, the connection between the male end 51 and the female end 52 does not need to consider the sealing problem, and the plugging fit between the first plugging structure 53 and the second plugging structure 54 does not need to consider the connection problem, so that the respective functions are simplified, the structural design is simpler, meanwhile, as different structures specially realize corresponding functions, the effect of the functions to be realized by the structure can be further strengthened, so that the connection structure and the sealing performance between the adjacent first split structures can be further enhanced.

In one embodiment, at least one of the first split structures is provided with an inner ring oil inlet 33, the motor oil inlet 9 is communicated to the inner ring oil inlet 33, and the inner ring oil inlet 33 is communicated with the first annular passage 49. The oil supplied from the oil inlet 9 of the motor enters the first annular channel 49 through the inner ring oil inlet 33, and is sprayed out from each first oil injection hole 10 to the end winding of the stator winding 16 through the first annular channel 49, so as to cool the stator winding 16.

In one embodiment, a first oil inlet joint is arranged at the inner ring oil inlet 33, and the first oil inlet joint is arranged on an axial end face of the inner ring oil injection structure. Through increasing this first oil connector, can conveniently realize being connected of inner circle oil spout structure and the inside oil pipeline of motor. In this embodiment, the first oil inlet joint is disposed on an axial end face of the inner ring oil injection structure, the axial end face faces the outside of the motor, the inner ring oil injection structure is mounted inside the stator winding 16, the axial position of the inner ring oil injection structure corresponds to the rotor assembly, the radial outside corresponds to the stator winding 16, and the radial inside corresponds to the motor spindle 1, so that when the inner ring oil injection structure is mounted and fixed, only the inner ring oil injection structure can be fixed on the end cover located outside the inner ring oil injection structure and is fixedly connected with the end cover, and the oil pipeline is correspondingly disposed on the end cover and is hermetically connected at a position corresponding to the first oil inlet joint of the inner ring oil injection structure.

In one embodiment, the inner ring oil injection structure is an integrally formed structure. Because the inner ring oil injection structure can be molded in an injection molding mode, the inner ring oil injection structure can be directly molded into an integrated structure in the injection molding mode, so that the structural integrity of the inner ring oil injection structure is improved, the sealing performance of the inner ring oil injection structure is improved, the installation procedures are reduced, and the installation efficiency is improved.

The outer fringe of inner circle oil spout structure is provided with the annular chimb that extends along the axial direction of inner circle oil spout structure, and the periphery wall of annular chimb flushes with inner circle oil spout structure's periphery wall. The annular convex edge extends towards the lateral outer side of the end cover, the axial length of the outer peripheral wall of the inner ring oil injection structure can be prolonged, the matching area between the inner ring oil injection structure and the stator winding 16 is increased, a larger-area contact oil film can be formed between the inner ring oil injection structure and the stator winding 16 for heat exchange, and the heat exchange efficiency of the stator winding 16 is improved.

In one embodiment, the outer ring oil injection structure comprises a plurality of second split structures which are sequentially connected end to end along the circumferential direction to form the outer ring oil injection structure. The outer ring oil injection structure adopts a split structure, so that the forming difficulty of the outer ring oil injection structure can be reduced, the design and the processing of an internal oil circuit structure of the outer ring oil injection structure are facilitated, the processing efficiency is improved, and the processing cost is reduced.

The second split structure comprises a male end 51 positioned at the first end and a female end 52 positioned at the second end, the male end 51 and the female end 52 of the adjacent second split structure are matched and fixedly connected, after the second split structure is combined, a second annular channel 50 which is through along the circumferential direction is formed in the outer ring oil injection structure, and the second oil injection hole 45 is communicated with the second annular channel 50. Two adjacent second block structures are connected through a male end 51 and a female end 52, in order to guarantee the sealing effect, a sealing ring 35 is arranged between the two adjacent second block structures, all the second block structures are sequentially arranged along the circumferential direction and are connected end to end, and the combined structure forms an annular outer ring oil injection structure. The inside annular through-type fluid region that forms through second annular channel 50 that passes through of outer lane oil spout structure, a plurality of second nozzle opening 45 have been seted up to outer lane oil spout structure outer lane, each second nozzle opening 45 all communicates with second annular channel 50 to carry out the coolant oil distribution through second annular channel 50, after the coolant oil enters into the inside back of outer lane oil spout structure from inner ring oil inlet 33, the coolant oil can be followed the radial blowout of second nozzle opening 45 to the end winding inboard of stator winding 16, cool off stator winding 16 end winding.

In one embodiment, the male end 51 and the female end 52 are both disposed on the outer periphery of the second split structure, the male end 51 and the female end 52 are in plug-in fit to form the outer ring mounting boss 37, and the outer ring mounting boss 37 is provided with a second connecting hole penetrating along the axial direction. The outer ring mounting seat 39 is arranged at a position, corresponding to the outer ring mounting boss 37, on the machine shell 19, the outer ring mounting seat 39 comprises a mounting groove, a mounting hole extending along the axial direction is formed in the bottom of the mounting groove, the second connecting hole corresponds to the mounting hole, the outer ring oil injection structure is mounted along the axial direction, the outer ring mounting boss 37 enters the mounting groove of the outer ring mounting seat 39 and slides to the mounting position along the mounting groove, the outer ring mounting boss 37 stops at the bottom of the mounting groove, the second connecting hole in the outer ring mounting boss 37 is matched with the mounting hole in the mounting structure at the moment, the outer ring oil injection structure is connected through bolts, and the outer ring oil injection structure is fixedly mounted on the machine shell 19.

In one embodiment, the structure of the female end 52 includes two oppositely disposed protruding plates, a slot is formed between the two protruding plates, the structure of the male end 51 includes a protruding block, the protruding block is disposed corresponding to the slot between the two protruding plates, after the protruding block is inserted into the slot, the second connecting holes on the male end 51 and the female end 52 are aligned, and the male end and the female end can be fixedly connected with the mounting structure through bolts, so that the fixed assembly of the outer ring oil injection structure is realized, and the fixed mounting of the outer ring oil injection structure on the front end cover 26 and the rear end cover 11 can be realized.

In one embodiment, the end face of the male end 51 of the second split structure is provided with a first plug structure 53, the end face of the female end 52 of the second split structure is provided with a second plug structure 54, and the first plug structure 53 and the second plug structure 54 are plugged and matched to form a sealed connection. Through set up first grafting structure 53 on one terminal surface of second subdivision structure, set up second grafting structure 54 on another terminal surface, can realize the grafting cooperation between two adjacent second subdivision structures, can utilize the grafting cooperation between first grafting structure 53 and the second grafting structure 54 to improve the sealing performance of adjacent second subdivision structure at the hookup location department. In order to improve the sealing reliability when the adjacent second split structures are connected, a sealing ring 35 or the like may be provided at the mating position of the two plug structures.

In one embodiment, the first plug structure 53 is a socket, for example, a cylindrical groove, the second plug structure 54 is a plug, for example, a cylindrical head matching with the cylindrical groove, the second annular channel 50 extends circumferentially through the plug, and when the plug is in plug-fit with the socket, the second annular channels 50 of adjacent second segment structures are communicated with each other. Because the cylindrical groove and the cylindrical head have a longer matching length, the sealing ring 35 is more conveniently arranged between the groove wall of the cylindrical groove and the outer wall of the cylindrical head to form sealing. After the seal is formed by the plugging engagement of the first plug structure 53 and the second plug structure 54, the function of fixing connection and sealing between the adjacent second split structures are separately arranged, the male end 51 and the female end 52 are used for realizing the fixing connection, the first plug-in structure 53 and the second plug-in structure 54 are used for realizing the sealing by the plug-in fit, therefore, the connection between the male end 51 and the female end 52 does not need to consider the sealing problem, and the plugging fit between the first plugging structure 53 and the second plugging structure 54 does not need to consider the connection problem, so that the respective functions are simplified, the structural design is simpler, meanwhile, as different structures specially realize corresponding functions, the effect of the functions to be realized by the structure can be further strengthened, so that the connection structure and the sealing performance between the adjacent second split structures can be further enhanced.

In one embodiment, at least one of the second split structures is provided with an outer ring oil inlet 34, the outer ring oil inlet 34 is connected to the motor oil inlet 9, and the outer ring oil inlet 34 is communicated with the second annular channel 50. The oil supplied from the motor oil inlet 9 enters the second annular channel 50 through the outer ring oil inlet 34, and is then sprayed out from each second oil injection hole 45 through the second annular channel 50 to the end winding of the stator winding 16, so as to cool the stator winding 16.

In one embodiment, a second oil inlet joint is arranged at the inner ring oil inlet 33, and the second oil inlet joint is arranged on the outer peripheral wall of the outer ring oil injection structure. Through increasing this second and going into the oil joint, can conveniently realize being connected of outer lane oil spout structure and the inside oil pipeline of motor. In this embodiment, the second oil inlet joint is disposed on the outer peripheral wall of the outer ring oil injection structure, an avoiding groove is disposed at a corresponding position on the casing 19, and the second oil inlet joint can slide into the mounting position along the avoiding groove, so as to realize the mounting and positioning of the outer ring oil injection structure in the casing 19.

In one embodiment, the outer ring oil injection structure is an integrally formed structure. Because outer lane oil spout structure can adopt the mode of moulding plastics to carry out the shaping, consequently, can be directly with outer lane oil spout structure through the mode of moulding plastics shaping formula structure as an organic whole to improve outer lane oil spout structure's structural integrity, improve outer lane oil spout structure's sealing performance, reduce the installation procedure, improve the installation effectiveness.

The inner perisporium outer fringe of outer lane oil spout structure is provided with the annular chimb that extends along the axial direction of outer lane oil spout structure, and the inner perisporium of annular chimb flushes with the inner perisporium of outer lane oil spout structure. This annular chimb extends towards the side direction outside at the end cover place, can prolong the interior perisporium axial length of outer lane oil spout structure, increases the cooperation area between outer lane oil spout structure and the stator winding 16 for can form the contact oil film of bigger area between outer lane oil spout structure and the stator winding 16 and carry out the heat transfer, improve the heat exchange efficiency of stator winding 16.

The embodiment of the application also discloses a bearing cooling structure, including the end cover, the end cover is provided with the bearing room, is provided with bearing 2 in the bearing room, still offers the cooling oil circuit that is used for carrying out the fuel feeding to inner circle oil spout structure on the end cover, and the bearing room passes through bearing fuel feeding way and cooling oil circuit intercommunication, and the bearing room carries out the fuel feeding through cooling oil circuit. The above communication refers to a state between the bearing chamber and the cooling oil passage, and does not mean that the bearing chamber, the bearing oil supply passage, and the cooling oil passage are in a direct communication relationship, and both indirect communication and direct communication should be within the scope of protection of the present application.

The bearing cooling structure utilizes the oil supply oil way of the inner ring oil injection structure to supply oil to the bearing chamber, so that the oil way of the system can be utilized to provide the cooling oil way of the bearing chamber, the existing cooling oil way can be utilized to provide cooling oil for the bearing, an independent bearing cooling oil way does not need to be additionally added, the oil way structure is simpler, the motor structure is simpler, and the processing cost can be effectively controlled. The end cap in this embodiment includes a front end cap 26 and a rear end cap 11, where the front end cap 26 is an end cap at an end where a shaft extending end of the motor spindle 1 is located, and the rear end cap 11 is an end cap disposed at the other end of the motor spindle 1. In describing the end caps, if no specific emphasis is placed on the end cap being either the front end cap 26 or the rear end cap 11, the features of this end cap are generally understood to be common to both the front end cap 26 and the rear end cap 11. The inner ring oil injection structure in the embodiment includes a front inner ring oil injection structure 29 and a rear inner ring oil injection structure 6, wherein the front inner ring oil injection structure 29 is connected with the front end cover 26, the rear inner ring oil injection structure 6 is connected with the rear end cover 11, the structure of the front inner ring oil injection structure 29 and the structure of the rear inner ring oil injection structure 6 may be completely or substantially the same, and are different only in local positions, or two inner ring oil injection structures with different structures may be adopted. The bearing 2 includes a front bearing disposed in a bearing chamber of the front end cap 26 and a rear bearing disposed in a bearing chamber of the rear end cap 11. Bearing steel sleeves 3 are further arranged in the bearing chambers, so that the structural strength of the bearing chambers is enhanced.

This application embodiment sets up special bearing lubrication flow channel through at the end cover, can introduce the bearing room of motor with the cooling oil, realizes the pertinence lubrication of motor bearing, practices thrift the cost, prolongs bearing life.

The end cover is provided with a motor oil inlet 9, the cooling oil path comprises a radial flow passage and an axial flow passage, the radial flow passage is communicated with the motor oil inlet 9, the axial flow passage is arranged at the tail end of the radial flow passage, and the axial flow passage is communicated with the inner ring oil injection structure. In this embodiment, because the inner ring oil injection structure needs to be connected with the end cover, and meanwhile, the inner ring oil injection structure also needs to correspond to the stator winding 16 in position design, the inner ring oil injection structure and the end cover need to be sequentially arranged along the axial direction, and the inner ring oil injection structure and the end cover are arranged to be connected at the axial position, so that the axial protruding height of the inner ring oil injection structure relative to the end cover is increased, after the inner ring oil injection structure is installed on the end cover, the axial position of the inner ring oil injection structure can correspond to the end winding of the stator winding 16, and the inner ring of the end winding can be cooled by the inner ring oil injection structure. Based on the design, the end cover is provided with axial flow, the first oil inlet joint of the inner ring oil injection structure extends in the axial direction and is in butt joint with the mounting structure on the end cover, the mounting structure of the end cover is provided with an axial flow passage which can be communicated with the axial flow passage of the first oil inlet joint, and therefore cooling oil in the cooling oil way is supplied to the first annular channel 49 of the inner ring oil injection structure, and oil supply to the inner ring oil injection structure is achieved.

In one embodiment, the end cover is provided with a mounting structure for mounting the inner ring oil injection structure, the mounting structure is an inner ring mounting seat 43, the inner ring mounting seat 43 axially protrudes towards the inner ring oil injection structure, and the inner ring oil injection structure is mounted on the inner ring mounting seat 43 through an inner ring mounting boss 38 and is fixedly locked through screws.

In one embodiment, the number of the inner ring installation seats 43 is multiple, the multiple inner ring installation seats 43 are arranged at intervals along the circumferential direction of the end cover, each inner ring installation seat 43 is provided with an installation hole for installing the inner ring oil injection structure, and the axial flow passage penetrates through one inner ring installation seat 43. Because the inner ring mounting seat 43 is arranged on the inner end face of the end cover, and the radial flow channel is located in the end cover, the whole inner ring mounting seat 43 is located outside the end face of the end cover, when the radial flow channel reaches the position of the inner ring mounting seat 43, the radial flow channel intersects with the axial flow channel on the inner ring mounting seat 43, so that the radial flow channel is communicated with the axial flow channel, cooling oil enters the axial flow channel on the inner ring mounting seat 43 through the radial flow channel, then enters the axial flow channel of the inner ring mounting boss 38 through the axial flow channel on the inner ring mounting seat 43, and further is conveyed to the first annular channel 49 of the inner ring oil injection structure through the axial flow channel of the inner ring mounting boss 38.

On the inner ring mounting seat 43 where the axial flow passage is located, the mounting holes are arranged in a staggered manner towards one side of the circumferential direction of the inner ring mounting seat 43 relative to the axial flow passage. Generally, the mounting hole of the inner ring mounting seat 43 is disposed at the middle position of the inner ring mounting seat 43, so that the wall thickness of the periphery of the mounting hole can be maximally reinforced, and the structural durability of the inner ring mounting seat 43 can be improved. After the axial flow passage is provided, since the axial flow passage is also provided on the inner ring mounting seat 43, a layout problem between the inner ring mounting seat 43 and the mounting hole needs to be considered, and since the axial flow passage and the mounting hole are both provided on the same inner ring mounting seat 43, not only a thickness of a side wall of the mounting hole but also a thickness of a partition wall between the mounting hole and the axial flow passage need to be considered. In the embodiment, in order to ensure the structural strength of the axial flow channel and the mounting hole, the axial flow channel is disposed at the radial outer side position of the inner ring mounting seat 43, the mounting hole is disposed in the region between the axial flow channel and the radial inner side corner of the inner ring mounting seat 43, and the axial flow channel itself does not bear a large connecting acting force, so that the axial flow channel is disposed at the radial outer side position of the inner ring mounting seat 43, the structural strength of the axial flow channel is not excessively affected, and the overall structural strength of the inner ring mounting seat 43 is not excessively affected, the mounting hole is disposed in the region between the axial flow channel and the radial inner side corner of the inner ring mounting seat 43, because the region between the axial flow channel and the radial inner side corner of the inner ring mounting seat 43 has a large area, and has enough space to dispose the mounting hole, and after the arrangement of the axial flow channel is realized, the wall thickness of the mounting hole can be guaranteed to be maximized under the current structure by installing the mounting hole, the overall structure of the inner ring mounting seat 43 is optimized, the structural strength is guaranteed, and the mounting support and the connection capacity of the inner ring mounting seat 43 are guaranteed while the reasonable arrangement of the flow channel is achieved.

In one embodiment, the lower portion of the end cover is provided with an end cover sump 44. In the present embodiment, the end cover oil sumps 44 are disposed at the lower portions of the front end cover 26 and the rear end cover 11, the case oil sump 40 is disposed at the bottom of the case 19, and after the motor is assembled, the end cover oil sumps 44 and the case oil sump 40 are communicated, so that the cooling oil can be conveniently collected and recycled. Because the front end cover 26 and the rear end cover 11 are both provided with the end cover oil sumps 44 for collecting the cooling oil, and the end cover oil sumps 44 of the front end cover 26 and the rear end cover 11 are both communicated with the casing oil sump 40 of the casing 19, the cooling oil self-circulation in the motor can be realized by adding accessories such as an oil pump, a heat exchanger and the like after the front end cover 26, the rear end cover 11 and the casing 19 are assembled and combined.

The end cover facing the oil injection structure of the inner ring is provided with a bulge 48, the bulge 48 is connected between the oil inlet 9 of the motor and the axial flow passage, and the radial flow passage is at least partially arranged on the bulge 48. Because the thickness of end cover itself is thinner, if direct set up radial runner on the end cover, will lead to the end cover to be less at the position thickness that sets up radial runner, can not satisfy the structural strength demand of end cover, consequently, set up the position at radial runner and increase protruding 48 of bar, can set up radial runner at the position that protruding 48 of bar corresponds, and make radial runner need not be restricted in the lid of end cover completely, can at least partly set up in protruding 48 of bar, avoid setting up the adverse effect that radial runner caused to the end cover structure through the mode that increases the local thickness of end cover, guarantee the overall structure intensity of end cover, guarantee the durability of end cover.

In one embodiment, the end cover comprises a rear end cover 11, a rear bearing runner 4 is arranged on an end face, away from the inner ring oil injection structure, of the rear end cover 11, the radial runner comprises a first radial runner 8 arranged on the rear end cover 11, a first axial oil injection hole 7 is arranged on the first radial runner 8, the rear bearing runner 4 is communicated with the first axial oil injection hole 7, the bearing chamber comprises a rear bearing chamber arranged on the rear end cover 11, and the rear bearing chamber is communicated with the first radial runner 8 sequentially through the rear bearing runner 4 and the first axial oil injection hole 7. In this embodiment, the motor oil inlet 9 is formed in the rear end cover 11 and communicates with the first radial flow passage 8, and after cooling oil enters the first radial flow passage 8 from the motor oil inlet 9, the cooling oil is injected into the rear bearing flow passage 4 from the first radial flow passage 8 through the first axial oil injection hole 7, so as to cool and lubricate the rear bearing.

In one embodiment, the end cover includes a front end cover 26, the front end cover 26 has a front bearing flow passage 36, the radial flow passage includes a fourth radial flow passage 25 disposed on the front end cover 26, the axial flow passage includes a fourth axial flow passage 28 disposed on the front end cover 26, and the bearing chamber includes a front bearing chamber disposed on the front end cover 26, and the front bearing chamber is communicated with the fourth radial flow passage 25 through the front bearing flow passage 36 and the fourth axial flow passage 28. In this embodiment, the motor oil inlet 9 communicates with the housing flow passage 18 disposed on the housing 19, then communicates with the fourth radial flow passage 25 on the front end cover 26 through the housing flow passage 18, then flows to the fourth axial flow passage 28 through the fourth radial flow passage 25, and enters the front bearing flow passage 36 through the fourth axial flow passage 28, so as to cool and lubricate the front bearing.

In one embodiment, the front bearing flow channel 36 is formed on a side wall of the front bearing chamber, the front bearing flow channel 36 extends in a direction from top to bottom toward a direction away from the inner ring oil injection structure, and the cooling oil enters the front bearing flow channel 36, flows into the front bearing chamber along the front bearing flow channel 36, and enters the front bearing chamber to lubricate the front bearing.

In one embodiment, two oil guide plates 55 are disposed opposite to each other on the inner wall surface of the front end cover 26, an oil guide channel 56 extending up and down is formed between the two oil guide plates 55, and the front bearing runner 36 is disposed at the bottom of the oil guide channel 56 and is communicated with the oil guide channel 56. In the present embodiment, by providing the oil guide plate 55 and forming the oil guide channel 56 by using the oil guide plate 55, the cooling oil delivered from the fourth axial flow channel 28 can be guided by the flow guide channel, so that the cooling oil can be collected by the oil guide channel 56 and enter the front bearing flow channel 36 along the oil guide channel 56 under the action of gravity and the oil pressure, thereby improving the utilization efficiency of the cooling oil and enabling the cooling oil to flow more intensively into the front bearing chamber.

In one embodiment, the inner ring fuel injection structure has a second axial fuel injection hole 32 formed in a side wall thereof, the second axial fuel injection hole 32 communicates with the first annular passage 49 of the inner ring fuel injection structure, and the second axial fuel injection hole 32 faces the fuel guide passage 56. In the present embodiment, the cooling oil in the fourth axial flow passage 28 first enters the first annular passage 49, and then part of the cooling oil is ejected from the first oil ejection hole 10 to cool the stator winding 16, and part of the cooling oil is ejected from the second axial oil ejection hole 32 to the inner wall surface of the front head cover 26, enters the oil guide passage 56 along the inner wall surface of the front head cover 26, is collected in the oil guide passage 56, and is then delivered into the front bearing chamber through the front bearing flow passage 36.

According to the embodiment of the application, the driving motor comprises the stator winding 16 and further comprises the stator cooling structure, and the stator winding 16 is located between the inner ring oil injection structure and the outer ring oil injection structure of the stator cooling structure.

According to an embodiment of the present application, the drive motor includes the stator winding 16, and further includes the outer ring oil injection structure described above, which is provided on the outer peripheral side of the stator winding 16.

According to an embodiment of the present application, the drive motor includes a bearing cooling structure, which is the above-described bearing cooling structure.

In one embodiment, the driving motor comprises a front end cover 26, a front inner ring oil injection structure 29, a front outer ring oil injection structure 23, a casing 19, a rear inner ring oil injection structure 6, a rear outer ring oil injection structure 14, a rear end cover 11, a stator assembly, a rotor assembly and a motor spindle 1, wherein a cooling water flow passage and a cooling oil flow passage are formed in the casing 19 and are spaced from each other, and cooling water can exchange heat with cooling oil in the cooling oil flow passage through the cooling water flow passage to cool the cooling oil, so that oil cooling and water cooling are mixed. Cooling oil can enter the interior of the motor to cool the stator winding 16 and the rotor and can cool and lubricate the bearings, and cooling water can support and cool the stator core 17 and indirectly cool the rotor core 20. Rotor dampers 27 are provided at both ends of the rotor core 20, and an oil seal 31, an oil seal cover 30, a seal ring 35, and the like are provided on the axial outer side of the front end cover 26, whereby the end sealing performance of the front end cover 26 can be improved.

The casing 19 adopts the oil-water mixing casing 19, the casing 19 is provided with a water inlet and a water outlet and a cooling oil flow passage, and the cooling oil flow passage is mutually isolated from the water passage inside the casing 19, so that the oil cooling and the water cooling of the motor can be realized, and the cooling efficiency is effectively improved. The water cooling system on the current new energy automobile can be borrowed to the water cooling structure of this application, can not influence the cooling system who originally goes up on the new energy automobile, also need not newly to increase outside cooling oil heat transfer system simultaneously, and the inside cooling oil of motor can be cooled off to the cooling water in casing 19 internal cooling stator core 17 simultaneously, can improve cooling efficiency by a wide margin. Corresponding equipment parts do not need to be newly added on the existing new energy automobile, and therefore cost can be saved.

In this embodiment, the motor further includes a front T-shaped communication pipe 24 and a rear T-shaped communication pipe 12, where the front T-shaped communication pipe 24 and the rear T-shaped communication pipe 12 have the same structure, the rear T-shaped communication pipe 12 includes a second axial flow passage 13 and a second radial flow passage 15, where two ends of the second axial flow passage 13 are respectively connected between the rear end cover 11 and the housing 19, the motor oil inlet 9 on the rear end cover 11 is communicated with the housing flow passage 18 on the housing 19, and the second radial flow passage 15 is connected to the outer ring oil inlet 34 of the rear outer ring oil injection structure 14, so as to supply oil to the rear outer ring oil injection structure 14. The front T-shaped communicating tube 24 includes a third axial flow passage 21 and a third radial flow passage 22, wherein two ends of the third axial flow passage 21 are respectively connected between the front end cover 26 and the casing 19, the fourth radial flow passage 25 on the front end cover 26 is communicated with the casing flow passage 18 on the casing 19, and the third radial flow passage 22 is connected to the outer ring oil inlet 34 of the front outer ring oil injection structure 23, so as to supply oil to the front outer ring oil injection structure 23. The front T-shaped communicating pipe 24 and the rear T-shaped communicating pipe 12 are provided with the sealing rings 35 at the connecting positions, so that the sealing effect is improved, the oil leakage phenomenon is avoided, and the oil pressure and the oil quantity for conveying cooling oil are ensured.

The T-shaped communicating pipe is made of plastic materials, such as: PA, PP, ABS, etc., and the T-shaped communicating pipes at the two ends of the casing runner 18 have the same structure, namely the T-shaped communicating pipes can be used universally. The T-shaped communicating pipe is internally provided with a through structure, three outlets of the T-shaped communicating pipe are respectively provided with a sealing groove, after a sealing ring 35 is assembled, the sealing ring is mutually assembled and extruded with the installation positions of the motor front end cover 26, the motor rear end cover 11 and the motor shell 19, so that sealing is realized, and an oil outlet at the bottom of the T-shaped communicating pipe is simultaneously inserted into an outer ring oil inlet 34 of an outer ring oil injection structure. After the cooling oil flows into the inside of the T-shaped communication pipe, the cooling oil flows along the two sides of the outer ring oil injection structure, and simultaneously, along with the filling of the cooling oil, the cooling oil is sprayed out from the second oil injection hole 45 formed in the outer circumferential side wall of the outer ring oil injection structure, so as to realize oil injection cooling of the outer wall of the end portion of the stator winding 16 (the position of the second oil injection hole 45 may be distributed in any area of the outer wall of the end portion of the stator winding 16, preferably, the position of the outer wall of the end portion of the stator winding 16 in the axial direction 1/2).

The rear end cover 11 is provided with a motor oil inlet 9, a first radial flow passage 8 and a first axial flow passage 5, the oil-water cooling structure comprises a first axial oil injection hole 7 and a rear bearing flow passage 4, a machine shell flow passage 18, a cooling water flow passage and a cooling oil flow passage are arranged on a machine shell 19, a fourth radial flow passage 25, a fourth axial flow passage 28 and a front bearing flow passage 36 are arranged on a front end cover 26, a rear inner ring oil injection structure 6 is arranged on a rear end cover 11, an inner ring oil inlet 33 of the rear inner ring oil injection structure 6 is communicated with the first axial flow passage 5, a rear outer ring oil injection structure 14 is arranged on the machine shell 19, an outer ring oil inlet 34 of the rear outer ring oil injection structure 14 is communicated with the second radial flow passage 15, a front inner ring oil injection structure 29 is arranged on the front end cover 26, an inner ring oil inlet 33 of the front inner ring oil injection structure 29 is communicated with the fourth axial flow passage 28, a front outer ring oil injection structure 23 is arranged on the machine shell 19, and an outer ring oil inlet 34 of the front outer ring oil injection structure 23 is communicated with the third radial flow passage 22.

The stator assembly comprises a stator core 17 and stator windings 16, the rotor assembly comprises a rotor core 20, the stator assembly is mounted on a machine casing 19, and the rotor assembly is mounted on the motor spindle 1.

The outer ring oil injection structure is matched with other structures of a motor to form a front end outer ring cooling oil path of the stator winding 16 and a rear end outer ring cooling oil path of the stator winding 16 according to different setting positions, cooling oil enters from a motor oil inlet 9 on the rear end cover 11 in the front end outer ring cooling oil path of the stator winding 16, is communicated with a second axial flow channel 13 of the rear T-shaped communicating pipe 12, is communicated with a shell flow channel 18 of the shell 19 and a third axial flow channel 21 of the front T-shaped communicating pipe 24, is communicated with a third radial flow channel 22, and injects oil from a plurality of second oil injection holes 45 of the front outer ring oil injection structure 23 to cool the outer side of the front end winding of the stator winding 16. In the cooling oil path of the outer ring at the rear end of the stator winding 16, cooling oil enters from the motor oil inlet 9 on the rear end cover 11, is communicated with the second axial flow passage 13 of the rear T-shaped communicating pipe 12, is communicated with the second radial flow passage 15, and is sprayed from the second oil spray hole 45 of the rear outer ring oil spray structure 14 to cool the outer side of the end winding at the rear end of the stator assembly.

The inner ring oil injection structure is matched with other structures of a motor to form a front end inner ring cooling oil path of the stator winding 16 and a rear end inner ring cooling oil path of the stator winding 16 according to different arrangement positions, cooling oil enters from a motor oil inlet 9 on the rear end cover 11 in the front end inner ring cooling oil path of the stator winding 16, is communicated with the second axial flow channel 13 of the rear T-shaped communicating pipe 12, is communicated with the shell flow channel 18 of the shell 19, is communicated with the third axial flow channel 21 of the front T-shaped communicating pipe 24, is communicated with the fourth radial flow channel 25 on the front end cover 26, enters the front inner ring oil injection structure 29 through the fourth axial flow channel 28, and is injected through the first oil injection hole 10 of the front inner ring oil injection structure 29 to cool the front end winding inner ring of the stator winding 16. In the cooling oil path of the inner ring at the rear end of the stator winding 16, cooling oil enters from the oil inlet 9 of the motor on the rear end cover 11, is communicated with the first radial flow passage 8 of the rear end cover 11, then enters the rear inner ring oil injection structure 6 through the first axial flow passage 5, and is injected from the first oil injection hole 10 of the rear inner ring oil injection structure 6 to cool the inner ring of the rear end winding of the stator winding 16.

In this embodiment, the casing 19 is provided with the water inlet 41 and the water outlet 42, wherein the water inlet 41 and the water outlet 42 are located at two circumferential sides of the casing flow channel 18, and the minimum distance between the water inlet 41 and the water outlet 42 is greater than the maximum diameter of the casing flow channel 18, so as to avoid the problem of poor structural stability caused by too thin wall thickness between the cooling oil and the cooling water flow channel, as a preferred embodiment, the difference between the distance between the water inlet 41 and the water outlet 42 and the maximum diameter of the casing flow channel 18 is between 10mm and 30mm, which can not only avoid the reduction of heat exchange efficiency between the cooling water and the cooling oil caused by too far distance between the cooling water flow channel and the casing flow channel 18, so that the cooling water can more fully fill the inside of the casing 19, and play an effective cooling role for the casing, but also avoid the problem that the flow channel is easily communicated due to too close distance between the cooling water flow channel and the casing flow channel, the stability of oil-water separation is improved. In this embodiment, the distance between the water inlet 41 and the cabinet flow passage 18 is the same as the distance between the water outlet 42 and the cabinet flow passage 18. In one embodiment, the distance between the water inlet 41 and the casing channel 18 may be smaller than the distance between the water outlet 42 and the casing channel 18, so as to more effectively utilize the characteristic that the temperature of the cooling water at the water inlet 41 is lower, and improve the heat exchange efficiency between the cooling water and the cooling oil.

The utility model provides a driving motor, the cooling oil circuit can divide into two parts, and inside the cooling oil passed through motor oil inlet 9 by outside oil supply circuit and got into the motor, divided into two branches, first branch gets into first radial runner 8, and the second branch gets into the second axial runner 13 of back T type communicating pipe 12, and the cooling oil begins two-way flow along first branch and second branch respectively. The first branch is divided into a cooling and lubricating rear bearing oil path and a cooling stator winding 16 rear end winding inner ring oil path. The second branch circuit is divided into an oil path for cooling the outer ring of the end winding at the rear end of the stator winding 16, an oil path for cooling the outer ring of the end winding at the front end of the stator winding 16, an oil path for cooling the inner ring of the end winding at the front end of the stator winding 16 and an oil path for cooling and lubricating the front bearing.

According to the embodiment of the application, the new energy automobile comprises the outer ring oil injection structure, the bearing cooling structure, the stator cooling structure or the driving motor.

The mixed cooling mode of the driving motor cooling system can fundamentally solve the problem that the stator winding 16 of the current water-cooled driving motor cannot be cooled, and can solve the problems of uneven winding cooling and overhigh local temperature of the existing oil cooling mode, and reduce the heat island effect in the motor, thereby improving the stability of the motor and prolonging the service life of the motor; can also strengthen the heat dispersion of the inside main source that generates heat of motor, promote motor power density, the reinforcing performance simplifies the complicated outside cooling structure of current traditional cold model machine of oil simultaneously, practices thrift the cost, realizes the lightweight of main motor system that drives, integrates.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The stator cooling structure is used for cooling a stator winding and is characterized by comprising a motor oil inlet, an inner ring oil injection structure and an outer ring oil injection structure, wherein the inner ring oil injection structure is arranged on the inner peripheral side of the stator winding, the outer ring oil injection structure is arranged on the outer peripheral side of the stator winding, the inner ring oil injection structure and the outer ring oil injection structure are communicated with the motor oil inlet, the inner ring oil injection structure comprises a first oil injection hole, the outer ring oil injection structure comprises a second oil injection hole, the opening of the first oil injection hole faces to the inner peripheral wall of the stator winding, and the opening of the second oil injection hole faces to the outer peripheral wall of the stator winding.

2. The stator cooling structure according to claim 1, wherein the first oil injection hole is provided in an outer peripheral wall of the inner ring oil injection structure and extends in a radial direction of the inner ring oil injection structure; and/or the second oil injection hole is arranged on the inner peripheral wall of the outer ring oil injection structure and extends along the radial direction of the outer ring oil injection structure.

3. The stator cooling structure according to claim 1, wherein the first oil injection hole is plural, and the plural first oil injection holes are uniformly spaced along an outer circumferential direction of the inner ring oil injection structure; and/or the second oil injection holes are multiple and are uniformly distributed at intervals along the circumferential direction of the inner circumference of the outer ring oil injection structure.

4. The stator cooling structure of claim 1, wherein the inner ring oil spray features and the outer ring oil spray features are arranged in groups to form an oil spray ring assembly, the inner ring oil spray features of the same oil spray ring assembly being located radially inward of the outer ring oil spray features.

5. The stator cooling structure according to claim 4, wherein the number of the oil injection ring assemblies is at least two, the first end of the stator winding is correspondingly provided with at least one oil injection ring assembly, the second end of the stator winding is correspondingly provided with at least one oil injection ring assembly, and the end part of the stator winding is positioned between the inner ring oil injection structure and the outer ring oil injection structure of the oil injection ring assemblies.

6. The stator cooling structure according to claim 5, wherein the oil spray ring assemblies at both ends of the stator winding are communicated with the motor oil inlet.

7. The stator cooling structure according to any one of claims 1 to 6, wherein the inner ring oil injection structure includes at least two first split structures, and the at least two first split structures are sequentially connected end to end in the circumferential direction to form the inner ring oil injection structure.

8. The stator cooling structure according to claim 7, wherein the first split structure comprises a male end and a female end, the male end and the female end are located at a first end, the male end and the female end of the adjacent first split structure are fixedly connected in a matched mode, after the first split structure is combined, a first annular channel which penetrates through the inner ring oil injection structure in the circumferential direction is formed, and the first oil injection hole is communicated with the first annular channel.

9. The stator cooling structure according to claim 8, wherein the male end and the female end are both disposed on an inner peripheral side of the first split structure, the male end and the female end are in plug-in fit to form an inner ring mounting boss, and the inner ring mounting boss is provided with a first connection hole penetrating in an axial direction.

10. The stator cooling structure according to claim 9, wherein a first plug structure is disposed on an end surface of the first split structure at the male end, a second plug structure is disposed on an end surface of the first split structure at the female end, and the first plug structure and the second plug structure are plug-connected to form a sealed connection.

11. The stator cooling structure according to claim 10, wherein the first plug structure is a socket, the second plug structure is a plug, the first annular channel circumferentially extends through the plug, and when the plug is in plug-in fit with the socket, the first annular channels of the adjacent first split structures are communicated with each other.

12. The stator cooling structure according to any one of claims 8 to 11, wherein at least one of the first split structures is provided with an inner ring oil inlet to which the motor oil inlet is communicated, the inner ring oil inlet being communicated with the first annular passage.

13. The stator cooling structure according to claim 12, wherein a first oil inlet joint is provided at the inner ring oil inlet, and the first oil inlet joint is provided on an axial end face of the inner ring oil injection structure.

14. The stator cooling structure according to any one of claims 1 to 6, wherein the inner ring oil injection structure is an integrally molded structure.

15. The stator cooling structure according to any one of claims 1 to 6, characterized in that an outer edge of the inner ring oil injection structure is provided with an annular bead extending in an axial direction of the inner ring oil injection structure, and an outer peripheral wall of the annular bead is flush with an outer peripheral wall of the inner ring oil injection structure.

16. The stator cooling structure according to any one of claims 1 to 6, wherein the outer ring oil injection structure includes a plurality of second segment structures, and the second segment structures are sequentially connected end to end in the circumferential direction to form the outer ring oil injection structure.

17. The stator cooling structure according to claim 16, wherein the second segment structure comprises a male end at the first end and a female end at the second end, the male end and the female end of the adjacent second segment structure are fixedly connected in a matching manner, after the second segment structures are combined, a second annular channel which penetrates in the circumferential direction is formed in the outer ring oil injection structure, and the second oil injection hole is communicated with the second annular channel.

18. The stator cooling structure according to claim 17, wherein a male end and a female end of the second split structure are both disposed on an outer peripheral side of the second split structure, the male end and the female end are in plug-in fit to form an outer ring mounting boss, and a second connecting hole penetrating in an axial direction is disposed on the outer ring mounting boss.

19. The stator cooling structure according to claim 17, wherein at least one of the second split structures has a radial oil inlet provided on an outer peripheral wall thereof, the motor oil inlet communicating with the radial oil inlet, and the radial oil inlet communicating with the second annular passage.

20. The stator cooling structure according to any one of claims 1 to 6, wherein the outer ring oil injection structure is an integrally molded structure.

21. The stator cooling structure according to claim 20, wherein an outer ring mounting boss is provided on the outer peripheral wall of the outer ring fuel injection structure, and a second connecting hole penetrating in the axial direction is provided on the outer ring mounting boss.

22. A drive motor comprising a stator winding, characterized by further comprising a stator cooling structure of any of claims 1 to 21, the stator winding being located between an inner ring oil spray structure and an outer ring oil spray structure of the stator cooling structure.

23. A new energy automobile, characterized by comprising the stator cooling structure of any one of claims 1 to 21 or the drive motor of claim 22.