Motor

Abstract

The present invention provides a motor, comprising a housing and a stator mounted in the housing. The stator comprises a stator iron core and a stator winding; a plurality of stator iron core oil passages are formed in the stator iron core; a plurality of oil spray holes are formed at the end of the housing close to the stator; the oil spray holes are formed in the housing or formed between the housing and the iron core oil passages; and the oil spray holes point to the stator winding. According to the present invention, an oil spray ring at a non-oil inlet end of a cooling oil passage is omitted to simplify the structure; moreover, oil grooves and oil cavities are formed in the housing to effectively ensure the pressure of the cooling oil passage and the oil spray effect on the side after removing the oil spray ring, and a retaining edge is provided on the oil spray ring on an oil inlet end to change the flow rate of the stator iron core oil passages, thereby ensuring approximate flow resistance, approximate flow rate, and balanced cooling of the iron core oil passages.

Description

A motor Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a motor. Background Art

[0002] Currently, the mainstream method for oil cooling axle stators is to use oil spray rings or oil pipes to spray cool the end windings. Oil spray rings, also known as oil rings or oil distribution rings, are components of oil-cooled motors that form the stator cooling oil circuit and spray cool the stator ends. Typically, there are two of these rings, one on each end. The existing design is complex, fails to fully utilize existing structural features to optimize the overall design, and results in high costs.

[0003] Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a motor to improve the problems of the existing cooling oil circuit being relatively complex in design, not fully utilizing the existing structure to optimize the overall design, and having high costs.

[0005] To achieve the above and other related objectives, the present invention provides a motor, comprising:

[0006] case,

[0007] a stator mounted in the housing, the stator comprising a stator core and a stator winding, the stator core being provided with a plurality of stator core oil passages;

[0008] A plurality of oil spray holes are provided at one end of the shell close to the stator, wherein the oil spray holes are formed on the shell or between the shell and the iron core oil channel, and the oil spray holes point to the stator winding.

[0009] In one embodiment of the present invention, a plurality of oil chambers and annular oil grooves are provided at one end of the housing close to the stator, the annular oil grooves are respectively connected to the stator core oil channel and the oil chamber, and the oil injection hole is formed at the bottom of the oil chamber.

[0010] In one embodiment of the present invention, the annular oil groove includes a plurality of oil groove blocks, and the oil groove blocks divide the annular oil groove into a plurality of oil groove sections, and each oil groove section is provided with at least one oil hole.

[0011] In one embodiment of the present invention, the plurality of oil chambers are distributed at intervals along the circumference of the housing, and each section of the oil groove corresponds to at least one oil chamber, and the oil hole is connected to the oil chamber.

[0012] In one embodiment of the present invention, an oil spray ring is further included. The oil spray ring is arranged at one end of the stator away from the annular oil groove and forms an annular oil cavity between the oil spray ring and the housing.

[0013] In one embodiment of the present invention, a blocking edge is provided at one end of the oil injection ring close to the stator core, and the blocking edge partially blocks the oil channel of the stator core.

[0014] In one embodiment of the present invention, in each section of the oil groove, the area of ​​the oil passage of the stator core blocked by the blocking edge gradually increases along the circumference thereof toward the direction approaching the oil hole.

[0015] In one embodiment of the present invention, a plug or a bowl-shaped plug is further included, and the plug or the bowl-shaped plug is sealed and connected to the housing to form the oil chamber.

[0016] In one embodiment of the present invention, an oil nozzle is further included. A positioning pin is provided at the end of the oil nozzle. The positioning pin is embedded in the stator core oil channel to form an oil cavity with the housing, and a gap is present between the positioning pin and the inner side wall of the stator core oil channel.

[0017] In one embodiment of the present invention, the fuel injector includes an upper plate and a lower plate, the upper plate and the lower plate are connected by an end plate, the positioning pin is provided on the end plate, and at least one fuel injection hole is provided on the lower plate.

[0018] In one embodiment of the present invention, crushing ribs are provided on the outer peripheries of the upper plate and the lower plate, and the fuel injection nozzle is sealed with the housing via the crushing ribs.

[0019] In one embodiment of the present invention, the oil injection nozzle further includes a partition plate, which is vertically arranged between the upper plate and the lower plate to partition the oil chamber.

[0020] In one embodiment of the present invention, one end of the partition plate is fixedly connected to the end plate, and the other end is provided with a compression rib.

[0021] In one embodiment of the present invention, a chamfer is formed in the housing near the stator core, and the oil injection hole is formed between the chamfer and the stator core oil passage.

[0022] The present invention proposes a motor, which omits the oil injection ring at the non-oil inlet end of the cooling oil circuit to simplify the structure. At the same time, an oil groove and an oil cavity are opened on the shell, or a chamfer is designed in the shell near the stator core to ensure that the cooling oil channel pressure and the oil injection effect on this side can be effectively guaranteed after the oil injection ring is removed.

[0023] The present invention proposes a motor which provides a retaining edge on the oil injection ring at the oil inlet end to change the flow rate of each stator core oil channel, thereby ensuring that the flow resistance and flow rate of each core oil channel are similar and the cooling is balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] FIG1 is a schematic structural diagram of a motor in one embodiment of the present invention.

[0026] FIG2 is a schematic diagram of the cross-sectional structure of end A of a motor in one embodiment of the present invention.

[0027] FIG3 is a schematic structural diagram of an annular oil groove at end A of a motor in one embodiment of the present invention.

[0028] FIG4 is a schematic structural diagram of an oil injection ring at the B end of a motor in one embodiment of the present invention.

[0029] FIG5 is a schematic cross-sectional view of the B end of a motor according to an embodiment of the present invention.

[0030] FIG6 is a schematic diagram of the structure of an oil injector in a motor according to an embodiment of the present invention.

[0031] FIG. 7 is an exploded view of an oil injection nozzle and a stator core in a motor according to an embodiment of the present invention.

[0032] FIG8 is a schematic diagram showing the coordination between the fuel injector and the stator core in a motor according to an embodiment of the present invention.

[0033] FIG9 is a schematic structural diagram of a motor in another embodiment of the present invention.

[0034] Description of labels:

[0035] 100. Motor; 10. Housing; 20. Stator; 30. Oil injection ring; 301. Annular oil chamber; 21. Stator core; 22. Stator winding; 211. Stator core oil channel; 302. Spray hole; 41. Oil chamber; 42. Annular oil groove; 411. Oil injection hole; 421. Oil groove block; 422. Oil groove; 423. Oil hole; 31. Stop edge; 412. Plug; 50. Oil injection nozzle; 51. Positioning pin; 52. Upper plate; 53. Lower plate; 54. End plate; 501. Crushing rib; 55. Partition plate; 200. Motor; 101. Chamfer. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0037] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0038] Please refer to Figures 1 to 8. The present invention proposes a motor to improve the problems of the existing cooling oil circuit being relatively complex in design, not fully utilizing the existing structure to optimize the overall design, and having high costs. Specifically, the motor 100 includes a housing 10, a stator 20 and an oil spray ring 30. The stator 20 is installed in the housing 10. The oil spray ring 30 is installed at one end of the stator 20, and an annular oil chamber 301 is formed between the oil spray ring 30 and the housing 10. Specifically, an oil inlet is provided at one end of the housing 10. The oil spray ring 30 is installed at one end of the stator 20 close to the oil inlet, and the oil inlet is connected to the annular oil chamber 301. In this embodiment, the stator includes a stator core 21 and a stator winding 22. For example, the end of the stator winding 22 away from the oil injection ring 30 is defined as end A, and the end of the stator winding 22 close to the oil injection ring 30 is defined as end B. The A end and the B end are connected through a plurality of stator core oil channels 211 distributed circumferentially along the stator core 21. It should be noted that a plurality of spray holes 302 are provided on the ring body of the oil injection ring 30, and the plurality of spray holes 302 are arranged along the axial direction of the ring body to cool the B end of the stator winding 22.

[0039] Please refer to Figures 1, 2 and 3. In embodiment 1, a plurality of oil spray holes 411 are provided at one end of the housing 10 close to the stator 20. The oil spray holes 411 are formed on the housing 10 and point to the stator winding 22. Specifically, a plurality of oil chambers 41 and annular oil grooves 42 are provided at one end of the housing 10 close to the stator 20, that is, a plurality of oil chambers 41 and annular oil grooves 42 are provided at the housing 10 close to the A end. The annular oil grooves 42 are respectively connected to the stator core oil passage 211 and the oil chamber 41, and the oil spray holes 411 are formed at the bottom of the oil chamber 41. The oil spray holes 411 point to the stator winding 22. Cooling oil flows from the B end along the stator core oil passage 211 into the oil chamber 41 and is sprayed from the oil spray holes 411 to the A end of the stator winding 22 to cool the stator winding 22. It should be noted that the annular oil groove 42 can be directly cast through a mold.

[0040] Referring to Figures 1, 2, and 3, in this embodiment, multiple oil chambers 41 are spaced apart along the circumference of the housing 10. For example, the oil injection holes 411 in the oil chambers 41 are oriented horizontally or vertically, aligning with the mold ejection direction. This optimizes mold design, improves product quality, and reduces costs. In this embodiment, the oil injection holes 411 are located above the stator windings 22 and are evenly distributed, ensuring uniform cooling. It should also be noted that multiple oil injection holes 411 may be provided at the bottom of the oil chamber 41. The orientations of the multiple oil injection holes 411 may be oriented in directions other than horizontal and vertical. In this embodiment, the orientations of the multiple oil injection holes 411 may be consistent, and the oil injection holes 411 may be machined to ensure more uniform and sufficient cooling. In this embodiment, the number of oil chambers 41 is set to three, but four, five, or any other number is also possible.

[0041] Referring to Figures 1, 2, and 3, in this embodiment, the annular oil groove 42 includes a plurality of oil groove barriers 421. The oil groove barriers 421 divide the annular oil groove 42 into multiple independent oil groove sections 422. Each independent oil groove section 422 is provided with at least one oil hole 423. Each oil groove section 422 corresponds to at least one oil cavity 41, and the oil hole 423 in the oil groove 422 communicates with the oil cavity 41. Cooling oil flows through the stator core oil passage 211 into the oil groove 422 and flows into the corresponding oil cavity 41 through the oil hole 423 in the oil groove 422. For example, when there are three oil cavities 41, the annular oil groove 42 is divided into three independent oil groove sections 422, each of which corresponds to one of the oil cavities 41, and the oil hole 423 in the oil groove 422 communicates with the oil cavity 41. Of course, in other embodiments, the number of the oil chambers 41 can be set to other numbers, and each independent oil groove 422 can correspond to multiple oil chambers 41. At this time, a plurality of oil holes 423 are correspondingly provided in the oil groove 422, and each oil hole 423 is connected to one of the oil chambers 41, which omits the oil injection ring at the non-oil inlet end of the cooling oil circuit to simplify the structure. At the same time, the oil groove 422 and the oil chamber 41 are opened on the shell 10 to ensure that the cooling oil channel pressure and the oil injection effect on this side can be effectively guaranteed after the oil injection ring is removed.

[0042] Please refer to Figures 1, 3, 4 and 5. It should be noted that each independent oil groove 422 is connected to multiple stator core oil channels 211, and among the multiple stator core oil channels 211 corresponding to the oil groove 422, the flow resistance in the stator core oil channels 211 close to the oil hole 423 is relatively small, while the flow resistance in the stator core oil channels 211 away from the oil hole 423 is relatively large. Therefore, in this embodiment, a retaining edge 31 is provided at one end of the oil injection ring 30 close to the stator core 21. The retaining edge 31 partially blocks the stator core oil channels 211 to regulate the flow in each stator core oil channel 211, thereby ensuring uniform flow distribution in each stator core oil channel 211 on the stator core 21, thereby achieving balanced cooling. In this embodiment, the area of ​​the stator core oil passage 211 blocked by the baffle 31 gradually increases along the circumference of each oil groove 422 toward the oil hole 423. That is, among the multiple stator core oil passages 211 corresponding to the oil groove 422, the stator core oil passage 211 closer to the oil hole 423 has a lower flow resistance to the cooling oil. Therefore, more obstruction is required at the B end of the stator core oil passage 211 to increase the flow resistance. The opposite is true for the stator core oil passage 211 farther from the oil hole 423. Due to the greater flow resistance at the farther distance from the oil hole 423, the stator core oil passage 211 at the B end has less obstruction, or even no obstruction, thereby ensuring similar flow resistance and flow rate across all stator core oil passages 211, resulting in balanced cooling. The baffle 31 can be configured as a continuously variable structure or as a combination of multiple baffles of varying heights.

[0043] It should also be noted that since the resistance of the cooling oil flowing from end B to end A increases, in order to balance the flow at end B, the size of the spray hole 302 on the oil injection ring 30 at end B can be appropriately reduced, and the flow resistance of the rotor circuit of the entire cooling system can also be increased accordingly to ensure that the flow reaching the stator remains unchanged or changes little.

[0044] Please refer to Figures 1, 2 and 3. In this embodiment, the oil chamber 41 and the oil injection hole 411 on the shell 10 can be directly cast and sealed with the shell 10 through a plug 412 to form the oil chamber 41. Alternatively, they can be sealed with the shell 10 through the bowl-shaped plug to form the oil chamber 41.

[0045] Please refer to Figures 6, 7 and 8. In some other embodiments, a separate fuel injector 50 can be used to replace the casting oil cavity and the sealing scheme of the plug 412, and the oil cavity can be formed by using the fuel injector 50. In this embodiment, the fuel injector 50 can be a plastic part, a rubber part or a metal part.

[0046] Please refer to Figures 6, 7 and 8. The oil spray nozzle 50 includes a locating pin 51, an upper plate 52, a lower plate 53 and an end plate 54. The upper plate 52 and the lower plate 53 are connected by the end plate 54. The locating pin 51 is arranged at the end of the oil spray nozzle 50, specifically on the end plate 54. The locating pin 51 is embedded in the stator core oil channel 211 to form an oil cavity 41 with the housing 10, and there is a gap between the locating pin 51 and the inner side wall of the stator core oil channel 211 to ensure that the cooling oil can flow out normally. At least one oil spray hole 411 is provided on the lower plate 53 to achieve oil spray cooling to the stator winding 22. In this embodiment, crushing ribs 501 are provided on the outer peripheries of the upper plate 52 and the lower plate 53. This allows the fuel injector 50 to be sealed against the housing 10 via the crushing ribs 501 when installed. Of course, in some other embodiments, the crushing ribs 501 may be provided only on the outer periphery of the lower plate 53. In this embodiment, the fuel injector 50 further includes a partition plate 55, which is vertically arranged between the upper plate 52 and the lower plate 53. One end of the partition plate 55 is fixedly connected to the end plate 54, and the other end is provided with a crushing rib 501 to separate the oil chambers 41. Each of the separated oil chambers is provided with at least one corresponding fuel injection hole 411.

[0047] Please refer to Figure 9. In embodiment 2, the difference between the motor 200 and the above-mentioned motor 100 is that at the A end, the oil spray hole 411 is formed between the housing 10 and the iron core oil channel 211. Specifically, a chamfer 101 is formed in the housing 10 near the stator iron core 21, and an oil spray hole 411 is formed between the chamfer 101 and the stator iron core oil channel 211. The oil spray hole 411 points to the stator winding 22 to achieve oil spray cooling of the stator winding 22.

[0048] The present invention proposes a motor, which omits the oil injection ring at the non-oil inlet end of the cooling oil circuit to simplify the structure. At the same time, an oil groove and an oil cavity are opened on the shell, or a chamfer is designed in the shell near the stator core to ensure that the cooling oil channel pressure and the oil injection effect on this side can be effectively guaranteed after the oil injection ring is removed.

[0049] The present invention proposes a motor which provides a retaining edge on the oil injection ring at the oil inlet end to change the flow rate of each stator core oil channel, thereby ensuring that the flow resistance and flow rate of each core oil channel are similar and the cooling is balanced.

[0050] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

[0051] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A motor, characterized in that: include: case, A stator is installed in the housing, the stator comprises a stator core and a stator winding, and a plurality of stator core oil passages are arranged on the stator core; A plurality of oil injection holes are arranged at one end of the shell close to the stator, wherein the oil injection holes are formed on the shell or between the shell and the iron core oil passage, and the oil injection holes point to the stator winding.

2. The motor according to claim 1, characterized in that A plurality of oil chambers and annular oil grooves are arranged at one end of the housing close to the stator. The annular oil grooves are respectively connected with the stator core oil passage and the oil chamber. The oil injection hole is formed at the bottom of the oil chamber.

3. The motor according to claim 2, characterized in that The annular oil groove comprises a plurality of oil groove baffles, and the oil groove baffles divide the annular oil groove into a plurality of oil groove sections, and each oil groove section is provided with at least one oil hole.

4. The motor according to claim 3, characterized in that The plurality of oil chambers are distributed at intervals along the circumference of the housing, and each section of the oil groove corresponds to at least one oil chamber, and the oil hole is communicated with the oil chamber.

5. The motor according to claim 3, characterized in that: It also includes an oil injection ring, which is arranged at one end of the stator away from the annular oil groove and forms an annular oil cavity between the oil injection ring and the housing.

6. The motor according to claim 5, characterized in that A stop edge is arranged at one end of the oil injection ring close to the stator core, and the stop edge partially blocks the oil passage of the stator core.

7. The motor according to claim 6, characterized in that In each section of the oil groove, the area of ​​the oil passage of the stator core blocked by the blocking edge gradually increases as the oil passage approaches the oil hole along the circumference thereof.

8. The motor according to claim 2, characterized in that It also includes a plug or a bowl-shaped plug, which is sealed and connected to the housing to form the oil chamber.

9. The motor according to claim 2, characterized in that It also includes an oil spray nozzle, wherein a positioning pin is provided at the end of the oil spray nozzle, and the positioning pin is embedded in the stator core oil passage to form an oil cavity with the housing, and a gap exists between the positioning pin and the inner side wall of the stator core oil passage.

10. The motor according to claim 9, characterized in that The fuel injection nozzle comprises an upper plate and a lower plate, wherein the upper plate and the lower plate are connected via an end plate, the positioning pin is arranged on the end plate, and at least one fuel injection hole is arranged on the lower plate.

11. The motor according to claim 10, characterized in that The outer circumferences of the upper plate and the lower plate are provided with crushing ribs, and the fuel injection nozzle is sealed with the housing through the crushing ribs.

12. The motor according to claim 10, characterized in that The oil injection nozzle further includes a partition plate disposed between the upper plate and the lower plate in a vertical direction to partition the oil chamber.

13. The motor according to claim 12, characterized in that One end of the partition plate is fixedly connected to the end plate, and the other end is provided with a compression rib.

14. The motor according to claim 1, characterized in that A chamfer is formed in the housing near the stator core, and the oil injection hole is formed between the chamfer and the stator core oil passage.

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