Stator with cooling oil path and manufacturing method thereof

Abstract

The invention discloses a stator with a cooling oil path and a manufacturing method thereof, and the stator with the cooling oil path is characterized in that the inner wall of a stator housing is provided with a recessed oil path, and the recessed oil path is communicated with a front oil guide groove and a rear oil inlet. Cooling oil is added into the sunken oil way, the cooling oil can be in direct contact with the stator iron core to cool the stator iron core, and the cooling oil added into the sunken oil way can directly enter the front oil guide groove or enter the rear oil guide groove through the rear oil inlet, so that the cooling oil is sprayed out by the front oil spraying hole and the rear oil spraying hole to cool the front stator coil and the rear stator coil; and the cooling effect on the stator assembly comprising the stator core, the front stator coil and the rear stator coil is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stator cooling, and more particularly to a stator with a cooling oil circuit and a manufacturing method thereof. Background Art

[0002] When the drive motor is in normal operation, the stator winding is subjected to the electromagnetic force for a long time, which will generate a lot of heat. This heat must be discharged in time through the cooling channel, otherwise it will have an adverse effect on the drive motor and damage the normal operation of the drive motor. The cooling solutions for the drive motor include air cooling, water cooling and oil cooling. Among them, the oil cooling method is widely used because it allows the cooling medium to act directly on the stator winding and has a good heat dissipation effect.

[0003] The traditional cooling oil circuit of the drive motor stator has insufficient contact area with the stator part, poor path, and mainly sprays the stator coil. The cooling effect still needs to be further improved. With the development of the automotive industry, more and more drive motor stators with cooling oil circuits are being created.

[0004] In the prior art, the utility model patent with the authorization announcement number CN204465230U discloses a stator cooling channel, a stator housing, a containing device, a stator and an electric motor for an electric vehicle, comprising: a stator body 4; a stator housing 1, which surrounds and sleeves the stator body 4 along the outer contour of the stator body (for example, assembled in a sleeve manner); a stator cooling channel 6 is distributed in the stator housing 1, a first end cover 2 and a second end cover 3; one or more first-type through grooves 62B extending along the circumferential direction of the first end cover 2 are provided on the end face of the first end cover 2 adjacent to the stator housing 1, and one or more second-type through grooves 62A extending along the circumferential direction of the second end cover 3 are provided on the end face of the second end cover 3 adjacent to the stator housing 1. The first-type through grooves 62B and the second-type through grooves 62A are collectively referred to as groove structures 62, and the shape and size of the groove structures 62 are designed so that each groove structure 62 can be fluidically connected to two adjacent cooling sub-channels 61 in the stator housing 1. This cooling channel design can only increase the contact area between the cooling medium and the stator part, but has a poor cooling effect on the stator assembly. In view of this, the present invention provides a stator with a cooling oil circuit and a manufacturing method thereof. Summary of the invention

[0005] In view of this, the present invention provides a stator with a cooling oil circuit and a manufacturing method thereof, so as to improve the cooling effect of a stator assembly including a stator core, a front stator winding package and a rear stator winding package.

[0006] In one aspect, the present invention provides a stator having a cooling oil circuit, comprising:

[0007] stator housing;

[0008] A front oil guide ring, the side wall of which is in contact with the inner wall of the stator housing and is provided with a front oil guide groove, and the inner wall of the front oil guide ring is provided with a front oil injection hole connected with the front oil guide groove;

[0009] A rear oil guide ring, whose side wall is in contact with the inner wall of the stator housing and is provided with a rear oil guide groove, and the inner wall of the rear oil guide ring is provided with a rear oil injection hole connected with the rear oil guide groove; the side wall of the rear oil guide ring is also provided with a rear oil inlet connecting the rear oil guide groove and an end of the rear oil guide ring close to the front oil guide ring;

[0010] The stator core has a side wall that fits the inner wall of the stator housing, and the front oil guide ring and the rear oil guide ring clamp the stator core; one end of the stator core has a front stator coil, and the other end has a rear stator coil, and in the direction from the front oil injection hole to the center line of the stator housing, the front oil injection hole partially overlaps with the front stator coil, and in the direction from the rear oil injection hole to the center line of the stator housing, the rear oil injection hole partially overlaps with the rear stator coil;

[0011] The inner wall of the stator housing is provided with a recessed oil passage, the recessed oil passage is connected with the front oil guide groove and the rear oil inlet, and the stator housing is provided with an oil filling port connected with the recessed oil passage.

[0012] Optionally, the stator housing comprises a front tube and a rear tube which are sequentially connected along the extension direction thereof, the inner wall of the rear tube is provided with strip areas which are arranged at intervals in the circumferential direction, the strip areas comprise front strip areas and rear strip areas which are arranged alternately, one end of the front strip area is flush with one end of the front tube close to the rear tube, the rear strip area is spaced apart from the front tube, along the extension direction of the stator housing, the maximum distance from the front strip area to the front tube is smaller than the maximum distance from the rear strip area to the front tube, and the area of ​​the inner wall of the rear tube which is not provided with the strip area is a recessed groove which is recessed toward the outer wall of the rear tube;

[0013] The side wall of the front oil guide ring is in contact with the inner wall of the front tube, and the inner wall of the front tube is provided with a groove, and the groove communicates with the concave groove and the front oil guide groove;

[0014] The side wall of the rear oil guide ring is in contact with the bottom surface of the recessed groove, and one end of the rear oil guide ring close to the front oil guide ring, the recessed groove and the groove define the recessed oil path.

[0015] Optionally, the angle defined by the direction of the oil filling port pointing to the center line of the stator housing and the direction of the groove pointing to the center line of the stator housing is in the range of 150° to 210°;

[0016] The angle defined by the direction of the oil filling port pointing to the center line of the stator housing and the direction of the rear oil inlet port pointing to the center line of the stator housing is in a range of 150° to 210°.

[0017] Optionally, along the extension direction of the stator housing, the groove and the front strip area do not overlap.

[0018] Optionally, one end of the rear oil guide ring close to the front oil guide ring is flush with one end of the rear strip area away from the front tube, and along the extension direction of the stator housing, the rear oil inlet port and the rear strip area do not overlap.

[0019] Optionally, a fixing protrusion is provided on the inner wall of the stator housing, and one end of the front oil guide ring away from the rear oil guide ring abuts against the fixing protrusion.

[0020] On the other hand, the present invention also provides a method for manufacturing a stator having a cooling oil circuit, comprising:

[0021] The stator shell is prepared and formed, wherein the inner wall of the stator shell is provided with a connected concave groove and a groove;

[0022] A front oil guide ring, a rear oil guide ring and a stator core are obtained, wherein the side wall of the front oil guide ring is provided with a front oil guide groove, and the inner wall of the front oil guide ring is provided with a front oil injection hole connected with the front oil guide groove; the side wall of the rear oil guide ring is provided with a rear oil guide groove, and the inner wall of the rear oil guide ring is provided with a rear oil injection hole connected with the rear oil guide groove; the side wall of the rear oil guide ring is also provided with a rear oil inlet connected with the rear oil guide groove and one end of the rear oil guide ring; one end of the stator core has a front stator coil, and the other end has a rear stator coil;

[0023] Putting the front oil guide ring into the stator housing;

[0024] The stator core is placed in the stator housing, one end of the stator core is in contact with one end of the front oil guide ring, and the front oil injection hole is partially overlapped with the front stator coil in the direction of the center line of the stator housing along the front oil injection hole;

[0025] The side of the rear oil guide ring connected to the rear oil inlet is oriented toward the front oil guide ring, and then the rear oil guide ring is placed in the stator housing, one end of the rear oil guide ring is abutted against the end of the stator core away from the front oil guide ring, and in the direction of the rear oil injection hole pointing to the center line of the stator housing, the rear oil injection hole and the rear stator coil package are partially overlapped; one end of the rear oil guide ring close to the front oil guide ring, the recessed groove and the groove define a recessed oil path, and the recessed oil path is connected to the front oil guide groove and the rear oil inlet of the rear oil guide ring.

[0026] Optionally, the stator shell is prepared and formed, and the inner wall of the stator shell is provided with the depressed groove and the groove connected to each other, including:

[0027] Injecting liquid material into the shell mold, and after the liquid material cools and solidifies, performing demoulding to obtain a precast shell, the precast shell comprises a front tube and a rear tube which are sequentially connected along the extension direction thereof, the inner wall of the front tube is provided with a groove, the inner wall of the rear tube is provided with strip areas arranged at intervals in the circumferential direction, one end of the strip area is flush with one end of the front tube close to the rear tube, the strip area comprises a front strip area and a rear strip area which are alternately arranged, along the extension direction of the stator shell, the maximum distance from the front strip area to the front tube is smaller than the maximum distance from the rear strip area to the front tube, the area on the inner wall of the rear tube where the strip area is not provided is a recessed area recessed toward the outer wall of the rear tube, and the recessed area is connected with the groove;

[0028] The stator housing is obtained by cutting a conducting groove in the rear strip area with a T-shaped knife. The conducting groove penetrates the rear strip area along the circumferential direction of the inner wall of the stator housing, and one end is flush with an end of the front tube close to the rear tube. The conducting groove and the recessed area constitute the recessed groove.

[0029] Optionally, obtaining the front oil guide ring, the rear oil guide ring and the stator core includes:

[0030] Selecting the rear oil guide ring according to the diameter of the bottom surface of the concave groove;

[0031] The front oil guide ring and the stator core are selected according to the inner diameter of the front pipe.

[0032] Optionally, after the liquid material is cooled and solidified, a demoulding process is performed to obtain the precast shell, comprising:

[0033] The shell mold includes a movable mold;

[0034] After the liquid material is cooled and solidified, the movable mold is cored out to form the recessed area and the groove on the inner wall of the precast shell.

[0035] Compared with the prior art, the stator with cooling oil circuit and the manufacturing method thereof provided by the present invention achieve at least the following beneficial effects:

[0036] 1. The stator with cooling oil circuit provided by the present invention and the manufacturing method thereof, the inner wall of the stator shell is provided with a recessed oil circuit, when cooling oil is added to the recessed oil circuit, the cooling oil can directly contact the side wall of the stator core, and cool the stator core. The recessed oil circuit connects the front oil guide groove and the rear oil inlet, that is, the cooling oil added to the recessed oil circuit can directly enter the front oil guide groove, or enter the rear oil guide groove through the rear oil inlet, and then be sprayed out by the front oil injection hole and the rear oil injection hole, along the direction of the center line of the stator shell pointed by the front oil injection hole, the front oil injection hole overlaps with the front stator coil part, along the direction of the center line of the stator shell pointed by the rear oil injection hole, the rear oil injection hole overlaps with the rear stator coil part, so the cooling oil sprayed from the front oil injection hole is directly sprayed to the front stator coil, and the cooling oil sprayed from the rear oil injection hole is directly sprayed to the rear stator coil, so as to realize the cooling of the front stator coil, the rear stator coil and the end of the stator core. The cooling oil in the recessed oil passage, the cooling oil sprayed from the front oil injection holes, and the cooling oil sprayed from the rear oil injection holes work together to further enhance the cooling of the stator assembly including the stator core, the front stator winding package, and the rear stator winding package.

[0037] 2. In the stator with cooling oil circuit and the manufacturing method thereof provided by the present invention, the recessed oil circuit is connected to the front guide oil groove, and the front guide oil ring does not need to be processed for the oil inlet, thus simplifying the process flow.

[0038] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0039] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0041] Figure 1 The figure is a schematic diagram of the structure of the stator housing and the rear oil guide ring provided by the present invention.

[0042] Figure 2 It is a structural schematic diagram of a stator with a cooling oil circuit provided by the present invention.

[0043] Figure 3 The present invention is a schematic flow chart of a method for manufacturing a stator with a cooling oil circuit.

[0044] Figure 4 It is another schematic flow chart of the manufacturing method of the stator with cooling oil circuit provided by the present invention.

[0045] Figure 5 It is a schematic diagram of the movable mold and the precast shell.

[0046] In the figure: 1. stator housing; 2. front oil guide ring; 3. front oil injection hole; 4. rear oil guide ring; 5. rear oil injection hole; 6. rear oil inlet; 7. stator core; 8. recessed oil passage; 9. oil filling port; 10. front pipe; 11. rear pipe; 12. strip area; 13. front strip area; 14. rear strip area; 15. recessed groove; 16. groove; 17. moving mold; 18. precast housing; 19. front stator coil. DETAILED DESCRIPTION

[0047] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0048] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0049] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0050] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0051] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] Example 1

[0053] Combination Figure 1 and Figure 2 , Figure 1 It is a structural diagram of the stator housing and the rear oil guide ring provided by the present invention. Figure 2 1 is a structural schematic diagram of a stator with a cooling oil circuit provided by the present invention, to illustrate a specific embodiment of the stator with a cooling oil circuit provided by the present invention, including:

[0054] Stator housing 1;

[0055] A front oil guide ring 2, whose side wall is in contact with the inner wall of the stator housing 1 and is provided with a front oil guide groove, and the inner wall of the front oil guide ring 2 is provided with a front oil injection hole 3 connected with the front oil guide groove;

[0056] The rear oil guide ring 4 has a side wall that fits the inner wall of the stator housing 1 and is provided with a rear oil guide groove, and the inner wall of the rear oil guide ring 4 is provided with a rear oil injection hole 5 that is connected to the rear oil guide groove; the side wall of the rear oil guide ring 4 is also provided with a rear oil inlet 6 that is connected to the rear oil guide groove and one end of the rear oil guide ring 4 close to the front oil guide ring 2;

[0057] The stator core 7 has a side wall that fits the inner wall of the stator housing 1, and the front oil guide ring 2 and the rear oil guide ring 4 clamp the stator core 7; one end of the stator core 7 has a front stator coil 19, and the other end has a rear stator coil; along the direction of the front oil injection hole 3 pointing to the center line of the stator housing 1, the front oil injection hole 3 partially overlaps with the front stator coil 19, and along the direction of the rear oil injection hole 5 pointing to the center line of the stator housing 1, the rear oil injection hole 5 partially overlaps with the rear stator coil;

[0058] The inner wall of the stator housing 1 is provided with a recessed oil passage 8 , which is connected to the front oil guide groove and the rear oil inlet 6 . The stator housing 1 is provided with an oil filling port 9 which is connected to the recessed oil passage 8 .

[0059] It can be understood that in this embodiment, the side wall of the front oil guide ring 2 is provided with a circumferentially extending front oil guide groove, and the side wall of the rear oil guide ring 4 is provided with a circumferentially extending rear oil guide groove. The front oil guide ring 2 and the rear oil guide ring 4 clamp the stator core 7. Along the extension direction of the stator housing 1, the distance from the oil injection port 9 to the front oil guide ring 2 is equal to the distance from the oil injection port 9 to the rear oil guide ring 4, so that the cooling oil injected from the oil injection port 9 into the recessed oil path 8 is evenly transmitted to both ends of the stator housing 1, thereby making the cooling effect of the cooling oil on the stator core 7 more uniform. Of course, it is not limited to this. Along the extension direction of the stator housing 1, the width of the front oil guide groove and the width of the rear oil guide groove can also be set according to the actual oil quantity requirements, and this embodiment does not make specific limitations on this.

[0060] Compared with the prior art, the stator with cooling oil circuit provided by the present invention has a recessed oil circuit 8 on the inner wall of the stator housing 1. When cooling oil is added to the recessed oil circuit 8, the cooling oil can directly contact the side wall of the stator core 7 to cool the stator core 7. The recessed oil passage 8 is connected to the front oil guide groove and the rear oil inlet 6, that is, the cooling oil added to the recessed oil passage 8 can directly enter the front oil guide groove, or enter the rear oil guide groove through the rear oil inlet 6, thereby being sprayed out by the front oil injection hole 3 and the rear oil injection hole 5. In the direction of the center line of the stator housing 1 along the front oil injection hole 3, the front oil injection hole 3 partially overlaps with the front stator winding package 19, and in the direction of the center line of the stator housing 1 along the rear oil injection hole 5, the rear oil injection hole 5 partially overlaps with the rear stator winding package. Therefore, the cooling oil sprayed from the front oil injection hole 3 is directly sprayed to the front stator winding package 19, and the cooling oil sprayed from the rear oil injection hole 5 is directly sprayed to the rear stator winding package, thereby cooling the front stator winding package 19, the rear stator winding package and the end of the stator core 7. The cooling oil in the recessed oil passage 8, the cooling oil sprayed from the front oil injection hole 3, and the cooling oil sprayed from the rear oil injection hole 5 work synergistically to further enhance the cooling of the stator core 7 of the stator assembly including the stator core 7, the front stator winding package, and the rear stator winding package. In addition, the recessed oil passage 8 is connected to the front guide oil groove, eliminating the need for oil inlet processing on the front guide oil ring 2, thereby simplifying the process flow.

[0061] Example 2

[0062] Continue to refer to Figure 1 and Figure 2 , to illustrate another specific embodiment of the stator with cooling oil circuit provided by the present invention, including:

[0063] Stator housing 1;

[0064] A front oil guide ring 2, whose side wall is provided with a front oil guide groove extending circumferentially, and an inner wall of the front oil guide ring 2 is provided with a front oil injection hole 3 communicating with the front oil guide groove;

[0065] The rear oil guide ring 4 has a rear oil guide groove extending circumferentially on its side wall, and a rear oil injection hole 5 communicating with the rear oil guide groove is provided on the inner wall of the rear oil guide ring 4; the side wall of the rear oil guide ring 4 is also provided with a rear oil inlet 6 communicating with the rear oil guide groove and one end of the rear oil guide ring 4 close to the front oil guide ring 2;

[0066] The stator core 7 has a side wall that fits the inner wall of the stator housing 1, and the front oil guide ring 2 and the rear oil guide ring 4 clamp the stator core 7; one end of the stator core 7 has a front stator coil 19, and the other end has a rear stator coil; along the direction of the front oil injection hole 3 pointing to the center line of the stator housing 1, the front oil injection hole 3 partially overlaps with the front stator coil 19, and along the direction of the rear oil injection hole 5 pointing to the center line of the stator housing 1, the rear oil injection hole 5 partially overlaps with the rear stator coil;

[0067] The stator housing 1 comprises a front tube 10 and a rear tube 11 which are sequentially connected along the extension direction thereof, the inner wall of the rear tube 11 is provided with strip areas 12 which are arranged at intervals in the circumferential direction, the strip areas 12 comprise front strip areas 13 and rear strip areas 14 which are arranged alternately, one end of the front strip area 13 is flush with the end of the front tube 10 close to the rear tube 11, the rear strip area 14 is spaced from the front tube 10, along the extension direction of the stator housing 1, the maximum distance from the front strip area 13 to the front tube 10 is smaller than the maximum distance from the rear strip area 14 to the front tube 10, and the area on the inner wall of the rear tube 11 where the strip area 12 is not provided is a recessed groove 15 which is recessed toward the outer wall of the rear tube 11;

[0068] The inner wall of the stator housing 1 is provided with a fixed protrusion, one end of the front oil guide ring 2 away from the rear oil guide ring 4 abuts against the fixed protrusion, the side wall of the front oil guide ring 2 fits the inner wall of the front tube 10, the inner wall of the front tube 10 is provided with a groove 16, the groove 16 connects the concave groove 15 and the front oil guide groove, and along the extension direction of the stator housing 1, the groove 16 does not overlap with the front strip area 13;

[0069] The side wall of the rear oil guide ring 4 fits the bottom surface of the recessed groove 15, and the end of the rear oil guide ring 4 close to the front oil guide ring 2, the recessed groove 15 and the groove 16 define a recessed oil path 8, and the recessed oil path 8 connects the front oil guide groove and the rear oil inlet 6, and the stator housing 1 is provided with an oil filling port 9 connected to the recessed oil path 8.

[0070] It is understandable that the area of ​​the inner wall of the rear tube 11 where the strip area 12 is not provided has a fixed depth recessed toward the outer wall of the rear tube 11, so the bottom surface of the recessed groove 15 located on the side of the strip area 12 away from the front oil guide ring 2 is annular, and the side wall of the rear oil guide ring 4 can fit the bottom surface of the recessed groove 15. The end of the rear oil guide ring 4 close to the front oil guide ring 2 defines a wavy recessed oil path 8 with the recessed groove 15 and the recessed groove 16. The recessed oil path 8 is relatively long. When cooling oil is added to the recessed oil path 8, the cooling oil is in direct contact with the stator core 7, and the contact cooling area is also relatively large, thereby improving the cooling effect. A recessed groove 16 is provided on the inner wall of the front tube 10, and the recessed groove 16 connects the recessed groove 15 and the front oil guide groove, so there is no need to process the oil inlet of the front oil guide ring 2, simplifying the process flow. In the extension direction of the stator housing 1, the groove 16 does not overlap with the front strip area 13. When the cooling oil in the recessed oil passage 8 enters the front oil guide groove along the groove 16, it will not be blocked by the structure of the front strip area 13, thereby ensuring the speed at which the cooling oil enters the front oil guide groove along the groove 16. The cooling oil added to the recessed oil passage 8 can directly enter the front oil guide groove, or enter the rear oil guide groove through the rear oil inlet 6, thereby being sprayed out by the front oil injection hole 3 and the rear oil injection hole 5. The cooling oil sprayed out of the front oil injection hole 3 is directly sprayed toward the front stator coil 19, and the cooling oil sprayed out of the rear oil injection hole 5 is directly sprayed toward the rear stator coil, thereby cooling the front stator coil 19, the rear stator coil and the end of the stator core 7. The cooling oil in the recessed oil passage 8, the cooling oil sprayed from the front oil injection hole 3, and the cooling oil sprayed from the rear oil injection hole 5 work together to further enhance the cooling of the stator core 7 of the stator assembly including the stator core 7, the front stator winding package 19, and the rear stator winding package.

[0071] Example 3

[0072] Continue to refer to Figure 1 and Figure 2 , to illustrate another embodiment of the stator with cooling oil circuit provided by the present invention, comprising:

[0073] Stator housing 1;

[0074] A front oil guide ring 2, whose side wall is provided with a front oil guide groove extending circumferentially, and an inner wall of the front oil guide ring 2 is provided with a front oil injection hole 3 communicating with the front oil guide groove;

[0075] The rear oil guide ring 4 has a rear oil guide groove extending circumferentially on its side wall, and a rear oil injection hole 5 communicating with the rear oil guide groove is provided on the inner wall of the rear oil guide ring 4; the side wall of the rear oil guide ring 4 is also provided with a rear oil inlet 6 communicating with the rear oil guide groove and one end of the rear oil guide ring 4 close to the front oil guide ring 2;

[0076] The stator core 7 has a side wall that fits the inner wall of the stator housing 1, and the front oil guide ring 2 and the rear oil guide ring 4 clamp the stator core 7; one end of the stator core 7 has a front stator coil 19, and the other end has a rear stator coil; along the direction of the front oil injection hole 3 pointing to the center line of the stator housing 1, the front oil injection hole 3 partially overlaps with the front stator coil 19, and along the direction of the rear oil injection hole 5 pointing to the center line of the stator housing 1, the rear oil injection hole 5 partially overlaps with the rear stator coil;

[0077] The stator housing 1 includes a front tube 10 and a rear tube 11 which are connected in sequence along its extension direction. The inner wall of the rear tube 11 is provided with strip areas 12 arranged at intervals in the circumferential direction. The strip areas 12 include front strip areas 13 and rear strip areas 14 which are arranged alternately. One end of the front strip area 13 is flush with one end of the front tube 10 close to the rear tube 11, and the rear strip area 14 is spaced from the front tube 10. Along the extension direction of the stator housing 1, the maximum distance from the front strip area 13 to the front tube 10 is smaller than the maximum distance from the rear strip area 14 to the front tube 10. The area on the inner wall of the rear tube 11 where the strip area 12 is not provided is a recessed groove 15 recessed toward the outer wall of the rear tube 11. The stator housing 1 is provided with an oil filling port 9 connected with the recessed oil passage 8.

[0078] The side wall of the front oil guide ring 2 fits the inner wall of the front tube 10. The inner wall of the front tube 10 is provided with a groove 16, which connects the recessed groove 15 and the front oil guide groove. Along the extension direction of the stator housing 1, the groove 16 does not overlap with the front strip area 13. The inner wall of the stator housing 1 is provided with a fixed protrusion, and one end of the front oil guide ring 2 away from the rear oil guide ring 4 abuts against the fixed protrusion.

[0079] The side wall of the rear oil guide ring 4 fits the bottom surface of the recessed groove 15 , and the end of the rear oil guide ring 4 close to the front oil guide ring 2 , the recessed groove 15 and the groove 16 define a recessed oil passage 8 .

[0080] The angle defined by the direction of the oil filling port 9 pointing to the center line of the stator housing 1 and the direction of the groove 16 pointing to the center line of the stator housing 1 is in the range of 150° to 210°;

[0081] The included angle defined by the direction of the oil filling port 9 pointing to the center line of the stator housing 1 and the direction of the rear oil inlet port 6 pointing to the center line of the stator housing 1 is in the range of 150° to 210°.

[0082] It should be noted that, in this embodiment, the center line of the front tube 10 overlaps with the center line of the rear tube 11, and the inner diameters of the front tube 10 and the rear tube 11 are the same. The end of the front oil guide ring 2 close to the rear oil guide ring 4 is flush with the end of the front tube 10 close to the rear tube 11, and along the extension direction of the stator housing 1, the end of the groove 16 away from the rear tube 11 is located between the two ends of the front oil guide groove. The end of the rear oil guide ring 4 close to the front oil guide ring 2 is flush with the end of the rear strip area 14 away from the front tube 10, and along the extension direction of the stator housing 1, the rear oil inlet 6 and the rear strip area 14 do not overlap, thereby ensuring that the structure of the rear strip area 14 will not block the cooling oil in the recessed oil path 8 from entering the rear oil inlet 6. The area of ​​the inner wall of the rear tube 11 without the strip area 12 has a depth of 1 mm to 2 mm that is recessed toward the outer wall of the rear tube 11. Along the circumference of the inner wall of the rear tube 11, the width of the front strip area 13 ranges from 15 mm to 20 mm, the width of the rear strip area 14 ranges from 15 mm to 20 mm, and the inner diameter of the oil filling port 9 ranges from 8 mm to 10 mm. Specifically, in the present embodiment, the inner diameter of the stator housing 1 is 300 mm, the outer diameter of the front oil guide ring 2 is 300 mm, the outer diameter of the stator core 7 is 300 mm, the outer diameter of the rear oil guide ring 4 is 300 mm, the depth of the recessed oil passage 8 is 2 mm, and the angle defined by the direction of the oil filling port 9 pointing to the center line of the stator housing 1 and the direction of the groove 16 pointing to the center line of the stator housing 1 is 180°. The angle defined by the direction of the oil filling port 9 pointing to the center line of the stator housing 1 and the direction of the rear oil inlet 6 pointing to the center line of the stator housing 1 is 180°. Of course, it is not limited to this and can be set according to actual needs.

[0083] It can be understood that the angle defined by the direction of the oil filling port 9 pointing to the center line of the stator housing 1 and the direction of the groove 16 pointing to the center line of the stator housing 1 is in the range of 150° to 210°; the angle defined by the direction of the oil filling port 9 pointing to the center line of the stator housing 1 and the direction of the rear oil inlet 6 pointing to the center line of the stator housing 1 is in the range of 150° to 210°. When the oil filling port 9 is located on the side away from the ground, the cooling oil injected from the oil filling port 9 flows to the side close to the ground due to gravity and gathers on the side close to the ground. In this process, the cooling oil fills the recessed oil path 8, and the gathered oil is more likely to enter the groove 16 and the rear oil inlet 6, thereby being sprayed out by the front oil injection hole 3 and the rear oil injection hole 5, spraying the front stator winding package 19, the rear stator winding package and the two ends of the stator core 7 for further cooling.

[0084] Example 4

[0085] Reference Figure 3 , Figure 3 The present invention is a flow chart of a method for manufacturing a stator with a cooling oil circuit provided by the present invention, and is used to illustrate a specific embodiment of the method for manufacturing a stator with a cooling oil circuit provided by the present invention, including:

[0086] S101: preparing and molding a stator shell, wherein the inner wall of the stator shell is provided with interconnected concave grooves and grooves;

[0087] S102: Obtain a front oil guide ring, a rear oil guide ring and a stator core, wherein a front oil guide groove is provided on a side wall of the front oil guide ring, and a front oil injection hole connected to the front oil guide groove is provided on an inner wall of the front oil guide ring; a rear oil guide groove is provided on a side wall of the rear oil guide ring, and a rear oil injection hole connected to the rear oil guide groove is provided on an inner wall of the rear oil guide ring; a rear oil inlet connected to the rear oil guide groove and one end of the rear oil guide ring is also provided on the side wall of the rear oil guide ring; a front stator coil is provided at one end of the stator core, and a rear stator coil is provided at the other end;

[0088] S103: Place the front oil guide ring into the stator housing;

[0089] S104: placing the stator core into the stator housing, with one end of the stator core abutting against one end of the front oil guide ring, and the front oil injection hole pointing in the direction of the center line of the stator housing, with the front oil injection hole partially overlapping with the front stator coil;

[0090] S105: The side of the rear oil guide ring connected to the rear oil inlet is oriented toward the front oil guide ring, and then the rear oil guide ring is placed into the stator housing, one end of the rear oil guide ring is abutted against the end of the stator core away from the front oil guide ring, and the rear oil injection hole is pointed in the direction of the center line of the stator housing along the rear oil injection hole, and the rear stator coil is partially overlapped; the end of the rear oil guide ring close to the front oil guide ring, the concave groove and the groove define a concave oil path, and the concave oil path is connected to the front oil guide groove and the rear oil inlet of the rear oil guide ring.

[0091] It should be noted that, before step S103, the position of the front oil guide ring may be determined first, and then steps S103 to S105 are performed to sequentially place the front oil guide ring, the stator core and the rear oil guide ring into the stator housing.

[0092] It is understandable that the inner wall of the stator housing directly forms a groove for connecting the recessed groove and the front oil guide groove during the casting process, so there is no need to process the oil inlet of the front oil guide ring, simplifying the process flow. The inner wall of the stator housing forms a recessed groove during the casting process. After the rear oil guide ring is installed, the rear oil guide ring is close to one end of the front oil guide ring, and the recessed groove and the groove directly define a recessed oil path. When cooling oil is added to the recessed oil path, the cooling oil can directly contact the stator core to cool the stator core. The recessed oil passage connects the front oil guide groove and the rear oil inlet, that is, the cooling oil added to the recessed oil passage can directly enter the front oil guide groove, or enter the rear oil guide groove through the rear oil inlet, and then be sprayed out by the front oil injection hole and the rear oil injection hole. In the direction of the center line of the stator housing along the front oil injection hole, the front oil injection hole overlaps with the front stator winding package, and in the direction of the center line of the stator housing along the rear oil injection hole, the rear oil injection hole overlaps with the rear stator winding package. Therefore, the cooling oil sprayed from the front oil injection hole directly sprays to the front stator winding package, and the cooling oil sprayed from the rear oil injection hole directly sprays to the rear stator winding package, thereby cooling the front stator winding package, the rear stator winding package and the end of the stator core. The cooling oil in the recessed oil passage, the cooling oil sprayed from the front oil injection hole and the cooling oil sprayed from the rear oil injection hole work together to further strengthen the cooling of the stator assembly including the stator core, the front stator winding package and the rear stator winding package.

[0093] Example 5

[0094] Reference Figure 4 and Figure 5 , Figure 4 is another schematic flow chart of a method for manufacturing a stator with a cooling oil circuit provided by the present invention, Figure 5 1 is a schematic diagram of a movable mold and a precast housing, to illustrate a specific embodiment of a method for manufacturing a stator with a cooling oil circuit provided by the present invention, comprising:

[0095] S201: The stator housing is prepared and formed, wherein the inner wall of the stator housing is provided with interconnected recessed grooves and grooves, including:

[0096] Liquid material is injected into the shell mold, and after the liquid material is cooled and solidified, demolding is performed to obtain a precast shell, wherein the precast shell includes a front tube and a rear tube that are sequentially connected along the extension direction thereof, a groove is provided on the inner wall of the front tube, and a strip area is provided on the inner wall of the rear tube that is circumferentially spaced, one end of the strip area is flush with an end of the front tube close to the rear tube, the strip area includes a front strip area and a rear strip area that are alternately arranged, along the extension direction of the stator shell, the maximum distance from the front strip area to the front tube is smaller than the maximum distance from the rear strip area to the front tube, and the area on the inner wall of the rear tube where no strip area is provided is a concave area that is concave toward the outer wall of the rear tube, and the concave area is connected to the groove;

[0097] A T-shaped knife is used to cut a conducting groove in the rear strip area to obtain a stator shell. The conducting groove penetrates the rear strip area along the circumferential direction of the inner wall of the stator shell, and one end is flush with the end of the front tube close to the rear tube. The conducting groove and the recessed area form a recessed groove.

[0098] S202: obtaining a front oil guide ring, a rear oil guide ring and a stator core, wherein a front oil guide groove is provided on a side wall of the front oil guide ring, and a front oil injection hole connected to the front oil guide groove is provided on an inner wall of the front oil guide ring; a rear oil guide groove is provided on a side wall of the rear oil guide ring, and a rear oil injection hole connected to the rear oil guide groove is provided on an inner wall of the rear oil guide ring; a rear oil inlet connected to the rear oil guide groove and one end of the rear oil guide ring is also provided on the side wall of the rear oil guide ring; a front stator coil is provided at one end of the stator core, and a rear stator coil is provided at the other end;

[0099] S203: Place the front oil guide ring into the stator housing.

[0100] S204: placing the stator core into the stator housing, with one end of the stator core abutting against one end of the front oil guide ring, and the front oil injection hole pointing in the direction of the center line of the stator housing, with the front oil injection hole partially overlapping with the front stator coil;

[0101] S205: Direct one side of the rear oil guide ring connected to the rear oil inlet toward the front oil guide ring, and then place the rear oil guide ring into the stator housing, with one end of the rear oil guide ring abutting against the end of the stator core away from the front oil guide ring, and along the direction of the rear oil injection hole pointing to the center line of the stator housing, the rear oil injection hole partially overlaps with the rear stator coil package; one end of the rear oil guide ring close to the front oil guide ring, the recessed groove and the groove define a recessed oil path, and the recessed oil path connects the front oil guide groove and the rear oil inlet of the rear oil guide ring.

[0102] It should be noted that this embodiment does not impose specific restrictions on the shell mold, and it is sufficient to obtain a precast shell. The liquid material can be liquid aluminum, of course, but it is not limited to this, and can be selected according to actual needs. In step S202, the front oil guide ring, the rear oil guide ring and the stator core are obtained, including: selecting the rear oil guide ring according to the diameter of the bottom surface of the recessed groove; selecting the front oil guide ring and the stator core according to the inner diameter of the front tube, so that the front oil guide ring is placed in the stator shell, and the front oil guide ring can fit the strip area; the stator core is placed in the stator shell, and the stator core can fit the inner wall of the rear tube; the rear oil guide ring is placed in the stator shell, and the rear oil guide ring can fit the bottom surface of the recessed groove, so as to define the recessed oil path. Refer to Figure 5 The shell mold includes a movable mold 17. When the liquid material cools and solidifies, Figure 5The movable mold 17 is cored out in the direction of the arrow in the figure, and a concave area and a groove are formed on the inner wall of the precast shell 18. Of course, the oil filling port can also be obtained by cored out, and it is not limited to this. In the casting process of the precast shell 18, the inner wall of the cast stator shell can also be provided with a fixed protrusion by changing the shell mold. When the front oil guide ring is installed, the end of the front oil guide ring away from the rear oil guide ring abuts against the fixed protrusion for positioning, and it is of course not limited to this.

[0103] It is understandable that the recessed area and the groove are directly formed during the casting process of the stator housing, which simplifies the process flow and does not require high processing accuracy. The end of the rear oil guide ring close to the front oil guide ring, the recessed groove and the groove define a recessed oil circuit, and the recessed oil circuit connects the front oil guide groove and the rear oil inlet. When cooling oil is added to the recessed oil circuit, the cooling oil can directly contact the stator core to cool the stator core. The cooling oil added to the recessed oil circuit can also directly enter the front oil guide groove, or enter the rear oil guide groove through the rear oil inlet, and then be sprayed out by the front oil injection hole and the rear oil injection hole. The cooling oil sprayed from the front oil injection hole is directly sprayed to the front stator coil, and the cooling oil sprayed from the rear oil injection hole is directly sprayed to the rear stator coil, so as to achieve cooling of the front stator coil, the rear stator coil and the end of the stator core. The cooling oil in the recessed oil passage, the cooling oil sprayed from the front oil injection holes, and the cooling oil sprayed from the rear oil injection holes work together to further enhance the cooling of the stator assembly including the stator core, the front stator winding package, and the rear stator winding package.

[0104] It can be seen from the above embodiments that the stator with cooling oil circuit and the manufacturing method thereof provided by the present invention achieve at least the following beneficial effects:

[0105] 1. The stator with cooling oil circuit provided by the present invention and the manufacturing method thereof, the inner wall of the stator shell is provided with a recessed oil circuit, when cooling oil is added to the recessed oil circuit, the cooling oil can directly contact the side wall of the stator core, and cool the stator core. The recessed oil circuit connects the front oil guide groove and the rear oil inlet, that is, the cooling oil added to the recessed oil circuit can directly enter the front oil guide groove, or enter the rear oil guide groove through the rear oil inlet, and then be sprayed out by the front oil injection hole and the rear oil injection hole, along the direction of the center line of the stator shell pointed by the front oil injection hole, the front oil injection hole overlaps with the front stator coil part, along the direction of the center line of the stator shell pointed by the rear oil injection hole, the rear oil injection hole overlaps with the rear stator coil part, so the cooling oil sprayed from the front oil injection hole is directly sprayed to the front stator coil, and the cooling oil sprayed from the rear oil injection hole is directly sprayed to the rear stator coil, so as to realize the cooling of the front stator coil, the rear stator coil and the end of the stator core. The cooling oil in the recessed oil passage, the cooling oil sprayed from the front oil injection holes, and the cooling oil sprayed from the rear oil injection holes work together to further enhance the cooling of the stator assembly including the stator core, the front stator winding package, and the rear stator winding package.

[0106] 2. In the stator with cooling oil circuit and the manufacturing method thereof provided by the present invention, the recessed oil circuit is connected to the front guide oil groove, and the front guide oil ring does not need to be processed for the oil inlet, thus simplifying the process flow.

[0107] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A stator with a cooling oil circuit, characterized in that: include: stator housing; A front oil guide ring, the side wall of which is in contact with the inner wall of the stator housing and is provided with a front oil guide groove, and the inner wall of the front oil guide ring is provided with a front oil injection hole connected with the front oil guide groove; A rear oil guide ring, whose side wall is in contact with the inner wall of the stator housing and is provided with a rear oil guide groove, and the inner wall of the rear oil guide ring is provided with a rear oil injection hole connected with the rear oil guide groove; the side wall of the rear oil guide ring is also provided with a rear oil inlet connecting the rear oil guide groove and an end of the rear oil guide ring close to the front oil guide ring; The stator core has a side wall that fits the inner wall of the stator housing, and the front oil guide ring and the rear oil guide ring clamp the stator core; one end of the stator core has a front stator coil, and the other end has a rear stator coil, and in the direction from the front oil injection hole to the center line of the stator housing, the front oil injection hole partially overlaps with the front stator coil, and in the direction from the rear oil injection hole to the center line of the stator housing, the rear oil injection hole partially overlaps with the rear stator coil; The inner wall of the stator housing is provided with a recessed oil passage, the recessed oil passage is connected with the front oil guide groove and the rear oil inlet, and the stator housing is provided with an oil filling port connected with the recessed oil passage.

2. The stator with cooling oil circuit according to claim 1, characterized in that: The stator housing comprises a front tube and a rear tube which are sequentially connected along the extension direction thereof, the inner wall of the rear tube is provided with strip areas which are arranged at intervals in the circumferential direction, the strip areas comprise front strip areas and rear strip areas which are arranged alternately, one end of the front strip area is flush with one end of the front tube close to the rear tube, the rear strip area is spaced apart from the front tube, along the extension direction of the stator housing, the maximum distance from the front strip area to the front tube is smaller than the maximum distance from the rear strip area to the front tube, and the area of ​​the inner wall of the rear tube which is not provided with the strip area is a concave groove which is concave toward the outer wall of the rear tube; The side wall of the front oil guide ring is in contact with the inner wall of the front tube, and the inner wall of the front tube is provided with a groove, and the groove communicates with the concave groove and the front oil guide groove; The side wall of the rear oil guide ring is in contact with the bottom surface of the recessed groove, and one end of the rear oil guide ring close to the front oil guide ring, the recessed groove and the groove define the recessed oil path.

3. The stator with cooling oil circuit according to claim 2, characterized in that: The angle defined by the direction of the oil filling port pointing to the center line of the stator housing and the direction of the groove pointing to the center line of the stator housing is in the range of 150° to 210°; The angle defined by the direction of the oil filling port pointing to the center line of the stator housing and the direction of the rear oil inlet port pointing to the center line of the stator housing is in a range of 150° to 210°.

4. The stator with cooling oil circuit according to claim 2, characterized in that: Along the extension direction of the stator housing, the groove and the front strip area do not overlap.

5. The stator with cooling oil circuit according to claim 2, characterized in that: One end of the rear oil guide ring close to the front oil guide ring is flush with one end of the rear strip area away from the front tube, and along the extension direction of the stator housing, the rear oil inlet port and the rear strip area do not overlap.

6. The stator with cooling oil circuit according to claim 1, characterized in that: The inner wall of the stator housing is provided with a fixing protrusion, and one end of the front oil guide ring away from the rear oil guide ring abuts against the fixing protrusion.

7. A method for manufacturing a stator having a cooling oil circuit, characterized in that: include: The stator shell is prepared and formed, wherein the inner wall of the stator shell is provided with a connected concave groove and a groove; A front oil guide ring, a rear oil guide ring and a stator core are obtained, wherein the side wall of the front oil guide ring is provided with a front oil guide groove, and the inner wall of the front oil guide ring is provided with a front oil injection hole connected with the front oil guide groove; the side wall of the rear oil guide ring is provided with a rear oil guide groove, and the inner wall of the rear oil guide ring is provided with a rear oil injection hole connected with the rear oil guide groove; the side wall of the rear oil guide ring is also provided with a rear oil inlet connected with the rear oil guide groove and one end of the rear oil guide ring; one end of the stator core has a front stator coil, and the other end has a rear stator coil; Putting the front oil guide ring into the stator housing; The stator core is placed in the stator housing, one end of the stator core is in contact with one end of the front oil guide ring, and the front oil injection hole is partially overlapped with the front stator coil in the direction of the center line of the stator housing along the front oil injection hole; The side of the rear oil guide ring connected to the rear oil inlet is oriented toward the front oil guide ring, and then the rear oil guide ring is placed in the stator housing, one end of the rear oil guide ring is abutted against the end of the stator core away from the front oil guide ring, and in the direction of the rear oil injection hole pointing to the center line of the stator housing, the rear oil injection hole and the rear stator coil package are partially overlapped; one end of the rear oil guide ring close to the front oil guide ring, the recessed groove and the groove define a recessed oil path, and the recessed oil path is connected to the front oil guide groove and the rear oil inlet of the rear oil guide ring.

8. The method for manufacturing a stator having a cooling oil passage according to claim 7, characterized in that: The stator shell is prepared and formed, and the inner wall of the stator shell is provided with the concave groove and the groove connected to each other, including: Injecting liquid material into the shell mold, and after the liquid material cools and solidifies, performing demoulding to obtain a precast shell, the precast shell comprises a front tube and a rear tube which are sequentially connected along the extension direction thereof, the inner wall of the front tube is provided with a groove, the inner wall of the rear tube is provided with strip areas arranged at intervals in the circumferential direction, one end of the strip area is flush with one end of the front tube close to the rear tube, the strip area comprises a front strip area and a rear strip area which are alternately arranged, along the extension direction of the stator shell, the maximum distance from the front strip area to the front tube is smaller than the maximum distance from the rear strip area to the front tube, the area on the inner wall of the rear tube where the strip area is not provided is a recessed area recessed toward the outer wall of the rear tube, and the recessed area is connected with the groove; The stator housing is obtained by cutting a conducting groove in the rear strip area with a T-shaped knife. The conducting groove penetrates the rear strip area along the circumferential direction of the inner wall of the stator housing, and one end is flush with an end of the front tube close to the rear tube. The conducting groove and the recessed area constitute the recessed groove.

9. The method for manufacturing a stator having a cooling oil passage according to claim 8, characterized in that: Acquiring the front oil guide ring, the rear oil guide ring and the stator core comprises: Selecting the rear oil guide ring according to the diameter of the bottom surface of the recessed groove; The front oil guide ring and the stator core are selected according to the inner diameter of the front pipe.

10. The method for manufacturing a stator having a cooling oil passage according to claim 8, characterized in that: When the liquid material is cooled and solidified, a demoulding process is performed to obtain the precast shell, including: The shell mold includes a movable mold; After the liquid material is cooled and solidified, the movable mold is cored out to form the recessed area and the groove on the inner wall of the precast shell.

Images