Stator and oil injection assembly integrated oil cooling motor

Abstract

The invention discloses a stator and oil injection assembly integrated oil cooling motor, a stator assembly is fixed in a casing, the stator assembly, a rotor assembly and the casing form a cooling cavity, the rotor assembly passes through the inner side of the stator assembly and is rotatably connected with the casing, and a rotating shaft oil duct communicated with the cooling cavity is arranged in the rotor assembly; the inner side of the end part of the stator assembly is provided with an oil injection assembly with an inclined flow guide hole, and the end part of the stator assembly is provided with a corresponding through hole, so that the internal oil duct of the outer circle of the stator core, the oil injection assembly and the cooling cavity are communicated; an oil inlet and an oil outlet are formed in the machine shell, cooling oil input from the oil inlet firstly flows through an internal oil channel to cool a stator iron core and then is guided and sprayed to an end winding through an inclined flow guide hole of an oil spraying assembly integrally installed on the stator assembly and a through hole in the end of the stator assembly, and cooling oil input from the rotor assembly firstly cools the interior of the rotor assembly and then cools the interior of the rotor assembly. And then the cooling oil is sprayed to the inner ring surface of the winding and is discharged through the oil outlet. The cooling device has the advantages of being compact in structure and remarkable in cooling effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of novel enclosed high-power density passenger car oil-cooled motors, and in particular relates to an oil-cooled motor with an integrated stator and an oil injection assembly. Background Art

[0002] The drive motors for new energy vehicles are developing towards miniaturization, integration, and high power density, which puts forward higher and higher requirements for motor cooling. Due to the insulating properties of lubricating oil, it can directly cool the heating parts such as windings and cores, so oil cooling can greatly improve the cooling performance of the motor and increase the power density of the motor. Therefore, oil-cooled motors are increasingly widely used in drive motors for new energy vehicles.

[0003] At present, the main oil cooling methods for the stator of new energy vehicle drive motors are oil pipe spraying and oil ring circumferential spraying. Oil pipe spraying requires a large radial space for oil pipes and is usually suitable for hybrid models; oil ring spraying usually has oil rings at both ends of the stator core, and the oil is concentrated and sprayed from the circumferential spray holes to the end of the winding. Its cooling uniformity is usually better than oil pipe spraying.

[0004] The oil spray ring spray solution is usually used in pure electric drive motors. Its structure usually has an oil channel on the outer circle of the iron core. After the oil cools the iron core through the iron core oil channel, it flows to the oil spray rings at both ends. After the oil spray rings are concentrated, they are sprayed out from the spray holes on the oil spray rings to cool the windings. A typical case is the drive motor of Tesla model 3. The advantages of this cooling structure are that the number of stator core punchings is small, the stator production is simple, and the spray hole design is flexible, but an oil spray ring assembly is required, and due to the production tolerance of the motor, a sealing ring is required on the oil spray ring assembly to ensure that the oil does not leak from the edge. This leads to a high cost for this structure and limits the installation space of the oil spray ring.

[0005] In order to reduce the cost of the oil injection ring assembly and save the space limitation of the oil injection ring, some manufacturers have proposed a structure of centripetal spraying of the iron core. By setting small holes of unequal height in the radial direction on the iron core, a channel for oblique spraying to the end of the winding is formed by rotating and stacking. A typical example of this solution is the Songzheng motor. The advantage of this solution is that the oil injection ring assembly is removed, and the cost is greatly reduced; the disadvantage is that the iron core needs to be rotated and stacked continuously, the iron core is complex and costly to manufacture, the spray hole is small and easy to clog, and because the spray hole is tilted, it is difficult to check whether it is clogged, and the design of the number and position of the spray hole is limited by the number of motor slots, and the spray hole design is not flexible. Summary of the invention

[0006] The technical problem to be solved by the present invention is as follows: In view of the above-mentioned problems in the prior art, an oil-cooled motor with an integrated stator and oil injection assembly is provided, which has a flexible and compact structure, high cooling efficiency and low production difficulty.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An oil-cooled motor with an integrated stator and oil injection assembly comprises: a stator assembly, a rotor assembly, a housing and an oil injection assembly with an inclined guide hole;

[0009] The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stacked stator punching sheets. The outer circumference of the punching sheet is provided with oil holes. The inner circumference of the stator punching sheet is provided with winding wire embedding grooves. The winding wire embedding grooves of adjacent stacked sections overlap and align, and the oil holes of the stacked sections are interconnected to form an oil path.

[0010] The stator assembly is fixed in the casing, and a cooling cavity is formed between the stator assembly, the rotor assembly and the casing. The rotor assembly passes through the inner side of the stator assembly, and the two ends are rotatably connected to the end covers of the casing respectively. The inner side of the rotor assembly is provided with a shaft oil passage connected to the cooling cavity; an oil injection assembly with an inclined guide hole is provided on the inner side of the end of the stator assembly, and a through hole corresponding to the inclined guide hole is provided at the end of the stator assembly to realize the connection between the internal oil passage formed by the outer circle of the stator core, the oil injection assembly at the two ends of the stator core and the cooling cavity; an oil inlet and an oil outlet are provided on the casing, and the cooling oil inputted from the oil inlet first flows through the internal oil passage outside the stator assembly to disturb and cool the stator core, and then is guided by the inclined guide hole of the oil injection assembly and the through hole at the end of the stator assembly to spray to the end winding to cool the winding, and the cooling oil inputted from the inner side of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet.

[0011] As a further improvement of the present invention, the stator punching sheet comprises a first stator punching sheet, a second stator punching sheet and a third stator punching sheet, and the diameter of the first stator punching sheet is smaller than the diameters of the second stator punching sheet and the third stator punching sheet; a plurality of second stator punching segments are stacked on both sides of the second stacking segment formed by stacking the first stator punching sheets; the third stator punching segment is located at both ends of the stator core, and the outer circumference of the third stator punching sheet is provided with avoidance holes corresponding to the inclined guide holes; the first stacking segment or the third stacking segment formed by stacking the first stator punching sheets is provided between the third stator punching segment and the second stator punching segment, and the fuel injection assembly is respectively arranged on the outer circumference of the first stacking segment and the third stacking segment;

[0012] The second stack corresponds to the oil inlet, and the cooling oil input from the oil inlet first enters the outer ring of the second stack to form an oil ring, then flows and diffuses to the internal oil channel of the second stator punching stack to cool the straight section of the stator core, and then flows into the annular oil channel formed by the first stack, the third stack and the oil injection assembly, flows into the avoidance hole of the third stator punching stack from the inclined guide hole of the oil injection assembly, and is ejected at a certain angle to spray onto the end winding to cool the winding.

[0013] As a further improvement of the present invention, an oil hole is provided on the outer circle side of the second stator punching sheet, and the oil hole is used as a cooling oil channel; the oil hole runs through the inner side of the outer circle of the second stator punching sheet, or the oil hole is opened along the outer circle edge of the second stator punching sheet.

[0014] As a further improvement of the present invention, the fuel injection assembly is an L-shaped, reverse L-shaped or U-shaped annular structure; the fuel injection assembly is an integrally formed whole-circular component, or the fuel injection assembly is composed of multiple fuel injection parts spliced ​​together, and adjacent fuel injection parts are connected by snap-fit ​​or bonding.

[0015] As a further improvement of the present invention, the shape of the inclined flow guide hole is square, circular, elliptical or fan-shaped; the inclined flow guide hole is a shrinking hole or a gradually expanding hole.

[0016] As a further improvement of the present invention, a convex point is provided on a side of the oil injection assembly, and the convex point abuts against an axial side of the second stator punching sheet.

[0017] As a further improvement of the present invention, a ribbed protrusion is provided on the top of the oil spray assembly, and the ribbed protrusion is in contact with the inner wall of the casing.

[0018] As a further improvement of the present invention, a protrusion is further provided on the side of the fuel injection assembly, and the protrusion and the convex point are respectively arranged on two opposite sides of the fuel injection assembly; a limiting groove is provided on the outer circular edge of the third stator punching sheet, and the protrusion is nested in the limiting groove.

[0019] As a further improvement of the present invention, a positioning block with an oblique groove is provided on the side of the fuel injection assembly, and an inclined boss is provided on the outer circular edge of the first stator punching sheet. The positioning block is buckled on the boss to achieve the connection and fixation between the fuel injection assembly and the first stator punching sheet.

[0020] An oil-cooled motor with an integrated stator and oil injection assembly comprises: a stator assembly, a rotor assembly, a housing and an oil injection assembly with an inclined guide hole;

[0021] The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stacked stator punching sheets. The outer circumference of the punching sheet is provided with oil holes. The inner circumference of the stator punching sheet is provided with winding wire embedding grooves. The winding wire embedding grooves of adjacent stacked sections overlap and align, and the oil holes of the stacked sections are interconnected to form an oil path.

[0022] The stator assembly is fixed in the casing, and a cooling cavity is formed between the stator assembly, the rotor assembly and the casing. The rotor assembly passes through the inner side of the stator assembly, and both ends are rotatably connected to the end covers of the casing respectively. A shaft oil channel connected to the cooling cavity is provided on the inner side of the rotor assembly; an oil spray assembly with an inclined guide hole is provided at the end of the stator assembly to realize the connection between the internal oil channel formed by the outer circle of the stator core, the oil spray assembly at both ends of the stator core and the cooling cavity; an oil inlet and an oil outlet are provided on the casing, and the cooling oil inputted from the oil inlet first flows through the internal oil channel outside the stator assembly to disturb and cool the stator core, and then is guided by the inclined guide hole of the oil spray assembly to spray to the end winding to cool the winding, and the cooling oil inputted from the inner side of the rotor assembly first cools the inside of the rotor assembly, and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet.

[0023] As a further improvement of the present invention, the stator punching sheet comprises a first stator punching sheet, a second stator punching sheet and a third stator punching sheet, and the diameter of the first stator punching sheet is smaller than the diameters of the second stator punching sheet and the third stator punching sheet; a plurality of second stator punching sheet stacks are stacked on both sides of the second stack formed by stacking the first stator punching sheets; the third stator punching sheet stack is located at both ends of the stator core, and a notch is provided on the outer circumference of the third stator punching sheet; a first stack or a third stack formed by stacking the first stator punching sheets is provided between the third stator punching sheet stack and the second stator punching sheet stack, and a plurality of the fuel injection assemblies are arranged in the notch on the outer circumference of the third stator punching sheet stack;

[0024] The second stack corresponds to the oil inlet. The cooling oil input from the oil inlet first enters the outer ring of the second stack to form an oil ring, then flows and diffuses to the internal oil channel of the second stator punching stack to cool the straight section of the stator core, and then flows into the annular oil channel at the outer circle of the first stack and the third stack, and is ejected at a certain angle from the inclined guide hole of the oil injection assembly, and sprayed onto the end winding to cool the winding.

[0025] As a further improvement of the present invention, the rotor assembly includes a hollow shaft and a rotor core, the two ends of the hollow shaft are rotatably connected to the end covers at the two ends of the casing respectively, the rotor core is fixed on the hollow shaft, and the hollow shaft drives the rotor core to rotate inside the stator assembly; a shaft oil channel is provided on the inner side of the hollow shaft, and oil-flinging holes are provided on the shaft oil channel, and multiple oil-flinging holes are respectively located on both sides of the rotor core; the cooling oil input from the shaft oil channel first cools the hollow shaft, and then is sprayed onto the inner annular surface of the winding through the oil-flinging holes to achieve cooling of the end winding and the inner annular surface of the winding.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. The oil-cooled motor with integrated stator and oil injection assembly of the present invention is provided with a stator assembly in a casing, a rotor assembly is provided inside the stator assembly, a cooling cavity is formed between the stator assembly, the rotor assembly and the casing, the two ends of the rotor assembly are respectively rotatably connected with the end covers of the casing, and a rotating shaft oil passage communicating with the cooling cavity is provided inside the rotor assembly; further, an oil injection assembly is provided inside the end of the stator assembly, and a through hole corresponding to the oil injection assembly is provided at the end of the stator assembly, so as to realize the connection between the internal oil passage formed by the outer circle of the stator core, the oil injection assembly at the two ends of the stator core and the cooling cavity; an oil inlet and an oil outlet are provided at the top and bottom of the casing, respectively, and the cooling oil inputted from the oil inlet first flows through the outside of the stator assembly to cool the stator assembly, and then is sprayed at a certain angle through the oil injection assembly and the through holes at the end of the stator assembly. Sprinkle to the outside of the end winding to strengthen the heat dissipation of the winding; the cooling oil input from the inside of the rotor assembly first cools the inside of the rotor assembly, and then sprays to the inner ring surface of the winding to cool the end winding and the inner ring surface of the winding; the oil flows to the rotor assembly under the action of gravity to strengthen the heat exchange effect of the rotor assembly, and all the cooling oil will finally be collected to the return oil flow channel by gravity and discharged from the oil outlet; the oil-cooled motor with integrated stator and oil injection assembly of the present invention realizes effective cooling of the inside of the rotor, the stator core, the stator end winding and the inner ring surface of the winding, and can effectively cool the stator core and the stator end winding, reduce the temperature of the motor stator core and winding, solve the problem of excessive temperature rise of key parts such as the motor stator and rotor due to the increase of motor power density, and reduce the size and installation space of the oil injection assembly, greatly reducing the cost of the oil injection assembly. At the same time, since the second punching sheet can realize the staggered oil channel by rotating and stacking, the types of punching sheets are greatly reduced, the structure is simpler, and the cost is lower.

[0028] 2. In the oil-cooled motor with integrated stator and oil injection assembly of the present invention, the stator assembly only includes three stator punching sheets, namely the first stator punching sheet, the second stator punching sheet and the third stator punching sheet, which is conducive to simplifying the stator production process, and has a simple and compact structure, high design applicability and simple installation; specifically, by stacking the second stator punching sheets on both sides of the first stator punching sheet, the third stator punching sheet is arranged at both ends of the stator core, and the inner sides of the first stator punching sheet, the second stator punching sheet and the third stator punching sheet are all provided with grooves for embedding the winding, so that a stator core with a simple structure and convenient disassembly and assembly is obtained, which has little effect on the torque characteristics of the motor; at the same time, The diameter of the first stator sheet is slightly smaller than the inner diameter of the second stator sheet and the third stator sheet. The oil injection assembly is arranged between the second stator sheet and the third stator sheet. After the first stator sheet is stacked, a circumferential annular space is formed between the outer side of the first stator sheet and the inner side of the housing. The cooling oil input from the oil inlet first enters the outer ring annular space of the first stator sheet to form an oil ring, then flows and diffuses to the internal oil channel formed by the outer ring of the second stator sheet, cools the straight section of the stator core, and then flows from the inclined guide hole of the oil injection assembly into the avoidance hole of the third stator sheet stack, and is ejected at a certain angle, sprayed to the end winding position for cooling. Due to the cooperation of the oil injection assembly and the third stator sheet stack, the oil can be prevented from being sprayed vertically from the sheet, ensuring that the cooling oil is accurately sprayed to the end winding, thereby achieving the purpose of cooling the temperature of the end winding. In the present invention, on the one hand, the sealing ring is eliminated and the oil injection ring is reduced, and the space at both ends of the motor is not limited by the oil injection ring, which greatly reduces the cost; on the other hand, it ensures that the motor stator core is simple to produce, the core oil channel is not easy to be blocked, and the spray hole design is flexible. 3. The oil-cooled motor with integrated stator and oil injection assembly of the present invention is provided with a shaft oil channel on the inner side of the hollow shaft, and oil-spinning holes are provided on the shaft oil channel, and multiple oil-spinning holes are respectively located on both sides of the rotor core; the cooling oil input from the shaft oil channel first cools the hollow shaft, and then is sprayed to the inner ring surface of the winding end through the oil-spinning holes, thereby realizing the cooling of the end winding and the inner ring surface of the winding, and strengthening the overall heat exchange of the winding. The oil-cooled motor with integrated stator and oil injection assembly of the present invention realizes all-round cooling from the inside to the outside, and improves the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structural principle of an oil-cooled motor in which the stator and the oil injection assembly are integrated in a specific embodiment of the present invention;

[0030] Figure 2 Schematic diagrams of the structural principle of the punching sheets in a specific embodiment of the present invention; wherein, Figure (a) is a schematic diagram of the structural principle of the first stator punching sheet, Figure (b) is a schematic diagram of the structural principle of the third stator punching sheet, and Figure (c) is a schematic diagram of the structural principle of the second stator punching sheet;

[0031] Figure 3 It is a schematic diagram of the structural principle of the stator core assembly in a specific embodiment of the present invention;

[0032] Figure 4 This is one of the schematic diagrams of the structural principle of the fuel injection assembly in a specific embodiment of the present invention;

[0033] Figure 5 This is one of the schematic diagrams of the structural principle of the fuel injection component in a specific embodiment of the present invention;

[0034] Figure 6 This is one of the schematic diagrams of the structural principle of the stator core after the oil injection assembly is installed in a specific embodiment of the present invention;

[0035] Figure 7 A schematic diagram of the oil flow path in the stator in a specific embodiment of the present invention;

[0036] Figure 8 It is a schematic diagram of the structural principle of the oil hole on the outer edge of the second stator punching sheet in a specific embodiment of the present invention;

[0037] Fig. 9 It is a schematic diagram of the structural principle of the oil groove on the outer edge of the second stator punching sheet in a specific embodiment of the present invention;

[0038] Fig.10 This is the second schematic diagram of the structural principle of the fuel injection assembly in a specific embodiment of the present invention;

[0039] Fig.11 This is the third schematic diagram of the structural principle of the fuel injection assembly in a specific embodiment of the present invention;

[0040] Fig.12 This is the fourth schematic diagram of the structural principle of the fuel injection assembly in the specific embodiment of the present invention;

[0041] Fig.13 It is a schematic diagram of the connection structure principle between the oil injection assembly and the iron core in a specific embodiment of the present invention;

[0042] Fig.14 This is the second schematic diagram of the structural principle of the fuel injection component in a specific embodiment of the present invention;

[0043] Fig.15 This is the second schematic diagram of the structural principle of the stator core after the oil injection assembly is installed in a specific embodiment of the present invention;

[0044] Fig.16 This is the fifth schematic diagram of the structural principle of the fuel injection assembly in the specific embodiment of the present invention;

[0045] Fig.17 This is the sixth schematic diagram of the structural principle of the fuel injection assembly in the specific embodiment of the present invention;

[0046] Fig.18 This is the seventh schematic diagram of the structural principle of the fuel injection assembly in the specific embodiment of the present invention;

[0047] Fig.19 This is the third schematic diagram of the structural principle of the stator core after the oil injection assembly is installed in a specific embodiment of the present invention;

[0048] Fig. 20 This is a fourth schematic diagram of the structural principle of the stator core after the oil injection assembly is installed in a specific embodiment of the present invention;

[0049] Fig.21 This is the second schematic diagram of the structural principle of the first stator punching sheet in a specific embodiment of the present invention;

[0050] Fig. 22 This is the second schematic diagram of the structural principle of the third stator punching sheet in the specific embodiment of the present invention;

[0051] Fig.23 This is the eighth schematic diagram of the structural principle of the fuel injection assembly in the specific embodiment of the present invention;

[0052] Fig.24 for Fig. 20 Schematic diagram of the cross-sectional structure principle of the stator core;

[0053] Legend: 1. Hollow shaft; 2. Shaft oil passage; 3. Sealed bearing; 4. Rotor assembly; 5. End winding; 6. Casing; 7. First stator punching sheet; 71. First stack; 72. Second stack; 73. Third stack; 74. Boss; 8. Oil inlet; 9. Internal oil passage; 10. Oil injection assembly; 101. Oil injection part; 1011. Slot; 1012. Boss; 102. Inclined guide hole; 103. Protrusion; 104. Striated protrusion; 105. Bump; 106. Positioning block; 11, second stator punching sheet; 111, fourth stacking segment; 112, fifth stacking segment; 113, sixth stacking segment; 114, seventh stacking segment; 115, eighth stacking segment; 116, ninth stacking segment; 117, oil hole; 12, third stator punching sheet; 121, tenth stacking segment; 122, eleventh stacking segment; 123, avoidance hole; 124, limiting groove; 125, notch; 13, oil-throwing hole; 14, oil return channel; 15, cooling cavity; 16, oil outlet; 17, rotor core. DETAILED DESCRIPTION

[0054] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0055] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0057] Example 1

[0058] like Figure 1 , Figure 2 and Figure 3 As shown, the oil-cooled motor with integrated stator and oil injection assembly of the present invention comprises: a stator assembly, a rotor assembly 4 , a housing 6 and an oil injection assembly 10 with inclined guide holes 102 .

[0059] The stator assembly consists of a stator core and a winding embedded in the stator core. The stator core is composed of multiple sections of stator punching sheets stacked together. Oil holes are distributed circumferentially on the outer circle of the punching sheets, and winding wire grooves are distributed on the inner circle of the stator punching sheets. The winding wire grooves of adjacent stacked sections overlap and align, and the oil holes of the stacked sections are interconnected to form an oil circuit.

[0060] The stator assembly is fixed in the housing 6, and a cooling cavity 15 is formed between the stator assembly, the rotor assembly 4 and the housing 6. The rotor assembly 4 passes through the inner side of the stator assembly, and the two ends are rotatably connected to the end covers of the housing 6 respectively. The inner side of the rotor assembly 4 is provided with a shaft oil passage 2 connected to the cooling cavity 15. An oil injection assembly 10 with an inclined guide hole 102 is provided on the inner side of the end of the stator assembly, and a through hole corresponding to the inclined guide hole 102 is provided at the end of the stator assembly, so as to realize the connection between the internal oil passage 9 formed by the outer circle of the stator core, the oil injection assembly 10 at the two ends of the stator core and the cooling cavity 15. The casing 6 is provided with an oil inlet 8 and an oil outlet 16. The cooling oil inputted from the oil inlet 8 first flows through the internal oil passage 9 on the outside of the stator assembly to cool the stator core, and then is guided through the inclined guide hole 102 of the oil spray assembly 10 and the through hole at the end of the stator assembly to be sprayed to the end winding 5 to cool the winding. The cooling oil inputted from the inner side of the rotor assembly 4 first cools the inside of the rotor assembly 4, and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet 16.

[0061] like Figure 2 , Figure 3 and Figure 6 As shown, the stator sheet includes a first stator sheet 7, a second stator sheet 11 and a third stator sheet 12, and the diameter of the first stator sheet 7 is smaller than the diameters of the second stator sheet 11 and the third stator sheet 12. The second stack 72 formed by stacking the first stator sheets 7 is respectively stacked with a fourth stack 111, a fifth stack 112, a sixth stack 113, a seventh stack 114, an eighth stack 115 and a ninth stack 116 formed by stacking a plurality of second stator sheets 11 on both sides. The tenth stack 121 and the eleventh stack 122 formed by stacking the third stator sheets 12 are respectively located at the two ends of the stator core, and the outer circumference of the third stator sheet 12 is provided with a avoidance hole 123 corresponding to the inclined guide hole 102. A third stack 73 formed by stacking the first stator punching sheets 7 is provided between the tenth stack 121 and the ninth stack 116, a first stack 71 formed by stacking the first stator punching sheets 7 is stacked between the fourth stack 111 and the eleventh stack 122, and the oil injection assembly 10 is respectively arranged on the periphery of the first stack 71 and the third stack 73. It can be understood that in actual use, the length of each punching stack can be changed as long as the total axial length of the stator core remains unchanged. The type and number of punching sheets can be changed, and the adjacent punching stacks can be designed as straight sections or staggered sections without forming a dead zone for oil flow. This section of punching sheet can have an oil guide groove on the edge of the stator punching sheet. The types of punching sheets can also be stacked in three, two or more types.

[0062] like Figure 7As shown, the second stack 72 corresponds to the oil inlet 8. The cooling oil input from the oil inlet 8 first enters the outer ring of the second stack 72 to form an oil ring, then flows and diffuses to the internal oil passage 9 of the second stator punching 11 stack, cools the straight section of the stator core, and then flows into the annular oil passage formed by the first stack 71 and the third stack 73 and the oil injection assembly 10, flows from the inclined guide hole 102 of the oil injection assembly 10 into the avoidance hole 123 of the third stator punching 12 stack, and is ejected at a certain angle, sprayed onto the end winding 5 to cool the winding. The inclined guide hole 102 on the oil injection assembly 10 can accurately spray the oil onto the end winding 5 at a corresponding angle, while the avoidance hole 123 on the outer circle of the third stator punching 12 stack prevents the oil from being blocked by the third stator punching 12, ensuring that the cooling oil is accurately sprayed onto the end winding 5, thereby achieving the purpose of cooling the temperature of the end winding. In this embodiment, on the one hand, the sealing ring is eliminated and the injection ring is reduced, so that the space at both ends of the motor is not restricted by the injection ring, which greatly reduces the cost; on the other hand, it ensures that the motor stator core is easy to produce, the core oil channel is not easily blocked, and the spray hole design is flexible.

[0063] In this embodiment, the first stator punching sheet 7 can be a small diameter punching sheet, so that the oil can be stored in the middle oil channel, which has better cooling performance for the middle section of the stator. A circumferential partition spacing scheme can also be adopted to make the oil more evenly distributed in the circumferential direction, thereby improving the uniformity of circumferential cooling of the stator core. Figure 6 As shown, the oil injection assembly 10 can separate the annular space between the first stack 71 and the third stack 73 and the housing 6 in the circumferential direction. Fig.19 As shown, the oil injection assembly 10 can also keep the annular space between the first stack segment 71 and the third stack segment 73 in communication with the housing 6 in the circumferential direction.

[0064] In other embodiments, the second punching plate 11 and the third punching plate 12 may also be the same punching plate, in which case the oil holes on the outer circumference of the punching plate are higher in the radial direction and have a larger number in the circumferential direction. It is also necessary to ensure that the inclined guide holes 102 on the oil injection assembly 10 are connected to the avoidance holes 123 on the tenth stacking segment 121 and the eleventh stacking segment 122 and are not blocked, while the other oil holes on the tenth stacking segment 121 and the eleventh stacking segment 122 will be blocked by the wall of the oil injection assembly 10 and will not leak oil.

[0065] In this embodiment, an oil hole 117 is provided on the outer circumference of the second stator punching sheet 11, and the oil hole 117 is used as a cooling oil channel. Figure 8 As shown, the oil hole 117 passes through the inner side of the outer circle of the second stator punching sheet 11. Fig. 9As shown, in other embodiments, the oil hole 117 can also be opened along the outer circumferential edge of the second stator punching sheet 11. In this case, the second stack 72 in the stator core can also be formed by stacking the second stator punching sheets 11, and a corresponding oil passage is designed on the housing 6. The oil flow passage in the stator core can be straight and easy to clean and not easy to be blocked.

[0066] Furthermore, the shapes of the oil-passing hole 117 and the avoidance hole 123 may be rectangular, circular, square or elliptical, or may be fan-shaped or the like. The inclined guide hole 102 may be a circular hole, a square hole, a conical hole or an elliptical hole, or a reducing hole or a gradually expanding hole. The angle and number of openings of the inclined guide hole 102 may be adjusted arbitrarily to enhance the spraying effect on the end winding 5. The spray holes of the inclined guide hole 102 may be a single-layer structure or a multi-layer structure in the radial direction; the inclined guide holes 102 may be evenly distributed in the circumferential direction or unevenly distributed. The arrangement of the inclined guide holes 102 is not limited by the number of stator slots, and the arrangement is flexible and the design difficulty is low.

[0067] like Fig.16 , Fig.17 and Fig.18 As shown, the fuel injection assembly 10 may be an L-shaped, reverse L-shaped, or square-shaped annular structure. The fuel injection assembly 10 may be an integrally formed full-circle component; Figure 4 and Figure 5 As shown, the oil injection assembly 10 can also be composed of a plurality of oil injection parts 101 spliced ​​together, and adjacent oil injection parts 101 are connected by snap-fit ​​connection or glue bonding. The oil injection assembly 10 can be pre-inserted onto the iron core during the iron core production process, or can be installed on the stator iron core by splicing after the stator is produced. The oil injection assembly 10 can be made of plastic, metal or other materials according to specific needs to save manufacturing costs.

[0068] like Fig.14 As shown, a clamping groove 1011 and a clamping platform 1012 are respectively provided at both ends of the fuel spraying member 101 to realize a snap connection between adjacent fuel spraying members 101. Fig.15 As shown, the fuel injection assembly 10 can be installed on the first stacking section 71 and the third stacking section 73 in such a way that the fuel injection assembly 10 is divided into several fuel injection parts 101 in the circumferential direction, and the fuel injection parts 101 are provided with a snap-fit ​​structure formed by a snap groove 1011 and a snap platform 1012 at both ends of the circumferential direction, and the multiple fuel injection parts 101 are locked with each other to form a circular ring-shaped spray assembly. Fig.15 That is, two identical semicircular oil injection parts 101 are locked with each other, thereby being fixed on the core stack. At this time, the outer edge of the first punching sheet 7 does not need a raised structure, such as Fig.21 shown.

[0069] like Fig.10As shown, in order to prevent the axial machining tolerance of the fuel injection assembly 10 from causing the fuel injection assembly 10 to move axially between the first stack segment 71 and the third stack segment 73, thereby causing a large amount of oil leakage from between the fuel injection assembly 10, the tenth stack segment 121 and the eleventh stack segment 122, a protrusion 103 is provided on the axial contact surface between the fuel injection assembly 10 and the second stator punching segment 11, so that the axial envelope size of the fuel injection assembly 10 (including the size of the protrusion 103) covers the tolerance range, thereby ensuring that the fuel injection assembly 10 is axially clamped to the iron core.

[0070] like Fig.11 As shown, in order to reduce the circumferential oil leakage of the oil injection assembly 10, a grooved protrusion 104 is provided in the area where the oil injection assembly 10 and the casing 6 are radially in contact and leakage may occur, that is, the top of the oil injection assembly 10. The grooved protrusion 104 contacts the inner wall of the casing 6 to prevent oil leakage.

[0071] like Fig.12 As shown, in order to reduce the leakage of the circumferential oil of the oil injection assembly 10, a convex block 105 is further provided on the side of the oil injection assembly 10, and the convex block 105 and the convex point 103 are respectively arranged on two opposite sides of the oil injection assembly 10. At the same time, a limiting groove 124 is also provided on the outer circumferential edge of the third stator punching sheet 12, and the convex block 105 is nested in the limiting groove 124.

[0072] like Fig.13 As shown, a positioning block 106 with an oblique groove is provided on the side of the fuel injection assembly 10, and an inclined boss 74 is provided on the outer circumferential edge of the first stator punching sheet 7, and the positioning block 106 is buckled on the boss 74 to achieve the connection and fixation of the fuel injection assembly 10 with the first stator punching sheet 7. Specifically, the fuel injection assembly 10 is buckled onto the first stacking segment 71 and the third stacking segment 73 through the positioning block 106. To ensure that the fuel injection assembly 10 does not fall off, the two sides of the interlocking structure of the fuel injection assembly 10 and the first stacking segment 71 and the third stacking segment 73 are not perpendicular, but form a small angle, and are locked after being buckled in, and are not easy to fall off.

[0073] like Figure 1 As shown, the rotor assembly includes a hollow shaft 1 and a rotor core 17. The two ends of the hollow shaft 1 are rotatably connected to the end covers at the two ends of the housing 6 through the sealing sleeves 3. The rotor core 17 is fixed on the hollow shaft 1. The hollow shaft 1 drives the rotor core 17 to rotate inside the stator assembly. A shaft oil passage 2 is provided inside the hollow shaft 1. The shaft oil passage 2 is provided with oil-slinging holes 13. Multiple oil-slinging holes 13 are respectively located on both sides of the rotor core 17. The cooling oil input from the shaft oil passage 2 first cools the hollow shaft 1, and then is sprayed to the inner annular surface of the winding through the oil-slinging holes 13 to achieve cooling of the end winding 5 and the inner annular surface of the winding.

[0074] In other embodiments, the oil-swinging hole 13 may not be set on the hollow shaft 1, but may be set on the hollow shaft 1 and the rotor core 17, so that the oil enters the rotor core 17 from the hollow shaft 1 and is then thrown out; it may also be set on the end surface of the rotor core 17, so that the oil enters the end surface area of ​​the rotor core 17 and is then thrown out.

[0075] In this embodiment, the heat dissipation of the motor winding, stator core and rotor is achieved in the following ways: when the motor is running, cooling oil is input into the motor through the oil inlet 8, and then flows to both ends through the connecting oil channel formed by the stacked stator punching sheets to cool the stator core, and then is tilted and sprayed from the oil spray assembly 10 installed on the stator core to the winding end 5 to take away the heat generated by the end winding 5. The cooling oil in the hollow shaft 1 is thrown out to the inner surface of the winding through the oil throwing hole 13 under the action of centrifugal force, and then gathers at the bottom of the casing 6 and flows out of the motor through the oil return channel 14 and the oil outlet 16. The cooling oil circuits of the stator and rotor are as follows: Figure 1 The path is shown by the arrow in the middle.

[0076] Example 2

[0077] like Fig. 20 , Fig.21 , Fig. 22 , Fig.23 and Fig.24 As shown, the oil-cooled motor with integrated stator and oil injection assembly of the present invention comprises: a stator assembly, a rotor assembly 4 , a housing 6 and an oil injection assembly 10 with inclined guide holes 102 .

[0078] The stator assembly consists of a stator core and a winding embedded in the stator core. The stator core is composed of multiple sections of stator punching sheets stacked together. Oil holes are distributed circumferentially on the outer circle of the punching sheets, and winding wire grooves are distributed on the inner circle of the stator punching sheets. The winding wire grooves of adjacent stacked sections overlap and align, and the oil holes of the stacked sections are interconnected to form an oil circuit.

[0079] The stator assembly is fixed in the housing 6, and a cooling cavity 15 is formed between the stator assembly, the rotor assembly 4 and the housing 6. The rotor assembly 4 passes through the inner side of the stator assembly, and the two ends are respectively connected to the end cover of the housing 6 for rotation. The inner side of the rotor assembly 4 is provided with a shaft oil passage 2 connected to the cooling cavity 15. An oil spray assembly 10 with an inclined guide hole 102 is provided at the end of the stator assembly to realize the connection between the internal oil passage 9 formed by the outer circle of the stator core, the oil spray assembly 10 at both ends of the stator core and the cooling cavity 15. The housing 6 is provided with an oil inlet 8 and an oil outlet 16. The cooling oil inputted from the oil inlet 8 first flows through the internal oil passage 9 on the outer side of the stator assembly to disturb and cool the stator core, and then is guided by the inclined guide hole 102 of the oil spray assembly 10 to spray to the end winding 5 to cool the winding. The cooling oil inputted from the inner side of the rotor assembly 4 first cools the inside of the rotor assembly 4, and then sprays to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet 16.

[0080] In this embodiment, the structural arrangement and working principle of the rotor assembly are the same as those in Embodiment 1 and will not be described in detail here.

[0081] like Fig. 20 As shown, the stator sheet includes a first stator sheet 7, a second stator sheet 11 and a third stator sheet 12, and the diameter of the first stator sheet 7 is smaller than the diameter of the second stator sheet 11 and the third stator sheet 12. A plurality of second stator sheet 11 stacks are stacked on both sides of the second stack 72 formed by stacking the first stator sheets 7. The tenth stack 121 and the eleventh stack 122 formed by stacking the third stator sheets 12 are respectively located at the two ends of the stator core, and a plurality of notches 125 are provided on the outer circumference of the third stator sheet 12. The first stack 71 or the third stack 73 formed by stacking the first stator sheets 7 is provided between the stack of the third stator sheets 12 and the stack of the second stator sheets 11, and a plurality of injection assemblies 10 are provided in the notches 125 on the outer circumference of the stack of the third stator sheets 12.

[0082] like Fig.24 As shown, the second stack segment 72 corresponds to the oil inlet 8. The cooling oil input from the oil inlet 8 first enters the outer ring of the second stack segment 72 to form an oil ring, then flows and diffuses to the internal oil channel 9 of the second stator punching segment 11, cools the straight section of the stator core, and then flows into the annular oil channel at the outer circle of the first stack segment 71 and the third stack segment 73, and is ejected from the inclined guide hole 102 of the oil injection assembly 10 at a certain angle, and sprays onto the end winding 5 to cool the winding.

[0083] like Fig.21 As shown, the outer circle of the first stator punching sheet 7 is a smooth structure. Fig.23 As shown, the fuel injection assembly 10 is a stepped component, the middle of the fuel injection assembly 10 is snapped into the notch 125, the two sides of the fuel injection assembly 10 are respectively facing the end winding 5 and the first stack segment 71 or the third stack segment 73, and the port of the inclined guide hole 102 facing the end winding 5 is lower than the port of the inclined guide hole 102 facing the first stack segment 71 or the third stack segment 73.

[0084] In this embodiment, the fuel injection assembly 10 has the characteristics of flexible installation, small material consumption, simple production and low cost, and the inclined guide hole 102 is flexible in design.

[0085] In this embodiment, the cooling working principle of the oil-cooled motor is similar to that in Embodiment 1 and will not be described in detail here.

[0086] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An oil-cooled motor with an integrated stator and oil injection assembly, characterized in that: include: A stator assembly, a rotor assembly (4), a housing (6) and an oil injection assembly (10) with an inclined flow guide hole (102); The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stacked stator punching sheets. The outer circumference of the punching sheet is provided with oil holes. The inner circumference of the stator punching sheet is provided with winding wire embedding grooves. The winding wire embedding grooves of adjacent stacked sections overlap and align, and the oil holes of the stacked sections are interconnected to form an oil path. The stator assembly is fixed in the housing (6); a cooling cavity (15) is formed between the stator assembly, the rotor assembly (4) and the housing (6); the rotor assembly (4) passes through the inner side of the stator assembly, and the two ends are respectively rotatably connected to the end covers of the housing (6); the inner side of the rotor assembly (4) is provided with a rotating shaft oil passage (2) connected to the cooling cavity (15); the inner side of the end of the stator assembly is provided with an oil injection assembly (10) with an inclined guide hole (102), and the end of the stator assembly is provided with a through hole corresponding to the inclined guide hole (102), so as to realize the internal oil passage (9) formed by the outer circle of the stator core and the two ends of the stator core. The oil injection assembly (10) and the cooling cavity (15) are connected; the housing (6) is provided with an oil inlet (8) and an oil outlet (16); the cooling oil inputted from the oil inlet (8) first flows through the internal oil passage (9) outside the stator assembly to disturb and cool the stator core, and then is guided through the inclined guide hole (102) of the oil injection assembly (10) and the through hole at the end of the stator assembly to be sprayed to the end winding (5) to cool the winding; the cooling oil inputted from the inner side of the rotor assembly (4) first cools the inside of the rotor assembly (4), and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet (16).

2. The oil-cooled motor with integrated stator and oil injection assembly according to claim 1, characterized in that: The stator punching sheets include a first stator punching sheet (7), a second stator punching sheet (11) and a third stator punching sheet (12), and the diameter of the first stator punching sheet (7) is smaller than the diameters of the second stator punching sheet (11) and the third stator punching sheet (12); a plurality of second stator punching sheet (11) stacked segments are stacked on both sides of a second stacked segment (72) formed by stacking the first stator punching sheets (7); the third stator punching sheet (12) stacked segments are located at both ends of the stator core, and the outer circumference of the third stator punching sheet (12) is provided with avoidance holes (123) corresponding to the inclined guide holes (102); a first stacked segment (71) or a third stacked segment (73) formed by stacking the first stator punching sheets (7) is provided between the third stator punching sheet (12) stacked segments and the second stator punching sheet (11) stacked segments, and the fuel injection assembly (10) is respectively arranged on the outer circumference of the first stacked segment (71) and the third stacked segment (73); The second stack (72) corresponds to the oil inlet (8). The cooling oil input through the oil inlet (8) first enters the outer ring of the second stack (72) to form an oil ring, then flows and diffuses to the internal oil passage (9) of the second stator punching (11) stack to cool the straight section of the stator core, then flows into the annular oil passage formed by the first stack (71) and the third stack (73) and the oil injection assembly (10), flows from the inclined guide hole (102) of the oil injection assembly (10) into the avoidance hole (123) of the third stator punching (12) stack, and is ejected at a certain angle to spray onto the end winding (5) to cool the winding.

3. The oil-cooled motor with integrated stator and oil injection assembly according to claim 2, characterized in that: An oil hole (117) is provided on the outer circle side of the second stator punching sheet (11), and the oil hole (117) is used as a cooling oil channel; the oil hole (117) passes through the inner side of the outer circle of the second stator punching sheet (11), or the oil hole (117) is opened along the outer circle edge of the second stator punching sheet (11).

4. The oil-cooled motor with integrated stator and oil injection assembly according to claim 3, characterized in that: The oil spray assembly (10) is an L-shaped, reverse L-shaped, or square-shaped annular structure; the oil spray assembly (10) is an integrally formed full-circular component, or the oil spray assembly (10) is composed of a plurality of oil spray parts (101) spliced ​​together, and adjacent oil spray parts (101) are connected by snap-fit ​​or bonding.

5. The oil-cooled motor with integrated stator and oil injection assembly according to claim 4, characterized in that: A convex point (103) is provided on the side of the oil injection assembly (10), and the convex point (103) abuts against the axial side of the second stator punching sheet (11).

6. The oil-cooled motor with integrated stator and oil injection assembly according to claim 4, characterized in that: The top of the oil injection assembly (10) is provided with a ribbed protrusion (104), and the ribbed protrusion (104) is in contact with the inner wall of the casing (6).

7. The oil-cooled motor with integrated stator and oil injection assembly according to claim 4, characterized in that: The side of the oil injection assembly (10) is also provided with a convex block (105), and the convex block (105) and the convex point (103) are respectively arranged on two opposite sides of the oil injection assembly (10); the outer circular edge of the third stator punching sheet (12) is provided with a limiting groove (124), and the convex block (105) is nested in the limiting groove (124).

8. The oil-cooled motor with integrated stator and oil injection assembly according to claim 4, characterized in that: A positioning block (106) with an oblique groove is provided on the side of the oil injection assembly (10); an inclined boss (74) is provided on the outer circumferential edge of the first stator punching sheet (7); the positioning block (106) is buckled on the boss (74) to achieve the connection and fixation between the oil injection assembly (10) and the first stator punching sheet (7).

9. An oil-cooled motor with integrated stator and oil injection assembly, characterized in that: include: A stator assembly, a rotor assembly (4), a housing (6) and an oil injection assembly (10) with an inclined flow guide hole (102); The stator assembly is composed of a stator core and a winding embedded in the stator core. The stator core is composed of a plurality of stator punching sheets stacked together. The outer circumference of the punching sheets is provided with oil holes. The inner circumference of the stator punching sheets is provided with winding wire embedding grooves. The winding wire embedding grooves of adjacent stacked sections are overlapped and aligned by stacking at a rotation angle. The oil holes of the stacked sections are interconnected to form an oil path. The stator assembly is fixed in the casing (6); a cooling cavity (15) is formed between the stator assembly, the rotor assembly (4) and the casing (6); the rotor assembly (4) passes through the inner side of the stator assembly, and the two ends are respectively rotatably connected to the end covers of the casing (6); the inner side of the rotor assembly (4) is provided with a rotating shaft oil passage (2) connected to the cooling cavity (15); an oil injection assembly (10) with an inclined guide hole (102) is provided at the end of the stator assembly to realize the internal oil passage (9) formed by the outer circle of the stator core and the oil injection assemblies (10) at the two ends of the stator core. The housing (6) is connected to a cooling cavity (15); an oil inlet (8) and an oil outlet (16) are provided on the housing; the cooling oil inputted from the oil inlet (8) first flows through an internal oil passage (9) outside the stator assembly to disturb and cool the stator core, and then is guided through an inclined guide hole (102) of an oil spray assembly (10) to be sprayed to the end winding (5) to cool the winding; the cooling oil inputted from the inner side of the rotor assembly (4) first cools the inside of the rotor assembly (4), and then is sprayed to the inner annular surface of the winding, and the cooling oil is discharged through the oil outlet (16).

10. The oil-cooled motor with integrated stator and oil injection assembly according to claim 9, characterized in that: The stator punching sheets include a first stator punching sheet (7), a second stator punching sheet (11) and a third stator punching sheet (12), and the diameter of the first stator punching sheet (7) is smaller than the diameters of the second stator punching sheet (11) and the third stator punching sheet (12); a plurality of second stator punching sheet (11) stacked segments are stacked on both sides of a second stacked segment (72) formed by stacking the first stator punching sheets (7); the third stator punching sheet (12) stacked segments are located at both ends of the stator core, and a notch (125) is provided on the outer circumference of the third stator punching sheet (12); a first stacked segment (71) or a third stacked segment (73) formed by stacking the first stator punching sheets (7) is provided between the third stator punching sheet (12) stacked segments and the second stator punching sheet (11) stacked segments, and a plurality of the fuel injection assemblies (10) are arranged in the notch (125) on the outer circumference of the third stator punching sheet (12) stacked segments; The second stack (72) corresponds to the oil inlet (8), and the cooling oil input through the oil inlet (8) first enters the outer ring of the second stack (72) to form an oil ring, then flows and diffuses to the internal oil passage (9) of the second stator punching (11) stack to cool the straight section of the stator core, and then flows into the annular oil passage at the outer circle of the first stack (71) and the third stack (73), and is ejected from the inclined guide hole (102) of the oil injection assembly (10) at a certain angle, and sprays onto the end winding (5) to cool the winding.

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