Oil-cooled motor with stator stepped oil path

Abstract

The invention relates to an oil cooling motor with a stator stepped oil path, which comprises a shell, an end plate, a stator and a rotor, a cooling sleeve is arranged outside a stator iron core, a plurality of annular oil paths are arranged in the cooling sleeve, each annular oil path rotates in a reciprocating manner along the axial direction, adjacent annular oil paths are communicated, a plurality of oil spraying holes are uniformly formed in the outer edges of two end surfaces of the cooling sleeve at intervals, and the oil spraying holes are communicated with the stator stepped oil path. The annular oil ways at the two ends communicate with the oil spraying holes, and a side wall oil inlet is further formed in the shell and communicates with the annular oil ways. At least one end in the shell is also provided with an oil baffle ring, the side wall of the rotating shaft is provided with an oil slinging hole A, two sides of the rotor core are provided with balance plates, the outer edge of each balance plate is provided with a plurality of oil slinging holes B, and the oil slinging holes A and the oil slinging holes B are communicated through radial oil ways on the balance plates. According to the invention, the heat exchange area of the stator core is increased, the heat dissipation efficiency is high, and the stator structure is more flexible in adaptability; the balance plate and the cooling sleeve are combined with the shell and the oil retainer to form a closed-loop oil way, and the heat dissipation requirements of various oil cooling motors are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to an oil-cooled motor with a stator stepped oil circuit. Background Art

[0002] With the continuous development of new energy vehicle drive motors towards the trends of high speed, high power, large torque, small volume, and light weight, increasingly stringent requirements are imposed on the heat dissipation performance of drive motors. Currently, for the drive oil-cooled motors on the market, the cooling method of the stator mainly involves setting a flow channel on the outer circumference of the stator to cool the iron core. The oil flowing through the outer circumference of the stator then enters the oil injection rings provided at both ends of the stator, and the windings at the ends of the stator are spray-cooled through the oil injection holes on the oil injection rings. This cooling method is the current mainstream oil-cooling solution. In the traditional scheme using oil guiding plates or oil injection rings at the ends of the stator, due to the addition of structural components such as the oil ring body injection moldings and front and rear sealing O-rings, the material cost and labor cost of the oil-cooled motor are significantly increased. Therefore, there is an urgent need for a more novel stator end spray-cooling scheme that can reduce costs.

[0003] In the above background, the spray-cooling scheme for the stator iron core end face has received extensive attention; currently, the disadvantages of the stator iron core spray-cooling scheme are as follows: First, a single design is difficult to be compatible with the flexible adjustment of the oil inlet hole position of the whole vehicle. Limited by different application scenarios, the position of the oil inlet often changes, and the flow resistance of the corresponding oil outlet hole will change significantly. Experiments have shown that the flow resistance will change by 50-60%! This has a very large impact on the spray-cooling result of the iron core! This means that a fixed and optimized stator oil circuit is difficult to achieve platform-based application, increasing the product development cycle and mold cost; Second, for the stator iron core spray-cooling scheme, usually, there are many types of stator iron core punching sheets, and the process cost is high. At the same time, due to the large number of holes and complex shapes in the iron core, it will have an adverse impact on the electromagnetic performance; the above problems have become one of the key problems restricting the application of the stator iron core spray-cooling scheme in the fields of low-cost and high-efficiency motors, and in-depth analysis and optimization are urgently needed! Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an oil-cooled motor with a stator stepped oil circuit, which has a compact structure, is convenient for production and assembly, and has high cooling efficiency.

[0005] In order to achieve the above invention purpose, the present invention adopts the following technical solutions:

[0006] An oil-cooled motor with a stepped oil circuit in the stator, comprising a housing, end plates, a stator and a rotor. The stator is fixed inside the housing. The rotor is arranged inside the stator and is rotatably connected to the housing and the end plates at both ends respectively. The stator includes a winding and a stator core. The winding is inserted into the stator core. A cooling sleeve is further provided outside the stator core. Multiple annular oil circuits are arranged inside the cooling sleeve. Each annular oil circuit reciprocates and rotates along the axial direction, and adjacent annular oil circuits are interconnected. A plurality of oil injection holes are evenly spaced along the outer edge of both end faces of the cooling sleeve. The plurality of oil injection holes are arranged in an arc shape, and the included angle between the oil injection holes at both ends of the arc and the center of the circle is 60° to 180°. The annular oil circuits at both ends are connected to the oil injection holes. A side wall oil inlet is further opened on the housing, and the side wall oil inlet is connected to the annular oil circuit; At least one end inside the housing is further provided with an oil retaining ring. The end plate is fixed to one end of the housing by bolts. The oil retaining ring is clamped between the housing and the end plate. At least a part of the inner side of the oil retaining ring extends inward to form an inner oil retaining part, and the inner oil retaining part corresponds to the position of the oil injection holes; The rotor includes a rotating shaft and a rotor core. The inside of the rotating shaft is hollow, and an oil throwing hole A is provided on the side wall of the rotating shaft. Both sides of the rotor core are balance plates. A plurality of oil throwing holes B facing the inside of the winding are provided on the outer edge of the balance plates, and a radial oil circuit is further provided on the balance plates. The radial oil circuit connects the oil throwing hole A and the oil throwing hole B.

[0007] As a preferred solution, the oil retaining ring includes a support ring and an outer convex rib provided on the outer side wall of the support ring. A convex edge is further provided at one end of the inner wall of the housing, and the outer convex rib is placed on the convex edge; A positioning convex ring is further provided on the side of the end plate in contact with the housing, and the positioning convex ring presses against the outer convex rib.

[0008] As a preferred solution, an oil retaining ring is provided at one end of the inner wall of the housing, and an oil retaining piece is further provided at the other end. The circumferential position of the oil retaining piece is the same as the circumferential position of the inner oil retaining part; The oil retaining piece and the convex edge are integrally formed with the housing.

[0009] As a preferred solution, the cooling sleeve includes an annular oil channel iron core. A notch is provided on the side wall of the oil channel iron core. The oil channel iron core is provided with a plurality of axially extending oil channel holes at circumferential intervals. The oil channel holes of adjacent two oil channel iron cores are arranged in a staggered manner, so that all the oil channel holes and the notches are interconnected to form an annular oil circuit.

[0010] As a preferred solution, each oil channel iron core is provided with one notch, and the notches of adjacent two oil channel iron cores are spaced 180°.

[0011] As a preferred solution, an oil channel shunt punching piece is further arranged every two oil channel iron cores in the cooling sleeve. A shunt hole is provided on the oil channel shunt punching piece, and the shunt hole connects adjacent two annular oil circuits.

[0012] As a preferred solution, the diversion holes on multiple oil passage diversion punching sheets are arranged offset from each other.

[0013] As a preferred solution, the cooling sleeve further includes an end face oil injection iron core punching sheet, the oil injection holes are arranged on the end face oil injection iron core punching sheet, and multiple long strip holes and multiple short strip holes are further arranged on the end face oil injection iron core punching sheet. Multiple end face oil injection iron core punching sheets are stacked in a deflected manner to form an end face oil injection iron core, and the coolant can only be ejected from the oil injection holes of the end face oil injection iron core.

[0014] As a preferred solution, a shaft shoulder and a steel pressing ring are further arranged on the rotating shaft. A balance plate on one side of the rotor iron core abuts against the shaft shoulder, and a balance plate on the other side of the rotor iron core abuts against the shaft shoulder. Both ends of the rotating shaft are respectively rotationally connected to the housing and the end plate through bearings, and a retaining ring for preventing the bearings from moving axially is further arranged on the rotating shaft. Multiple limiting teeth are arranged at intervals on the retaining ring, and a ring groove is arranged on the rotating shaft, and the limiting teeth are embedded in the ring groove.

[0015] As a preferred solution, a rotor cooling oil pipe is further included. One end of the rotating shaft is open, the rotor cooling oil pipe is inserted and fixed on the housing, and the rotor cooling oil pipe extends into the rotating shaft.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] In the present invention, a cooling sleeve is arranged outside the stator iron core, and a plurality of annular oil passages that reciprocate axially are arranged in the cooling sleeve and finally ejected from the oil injection holes. The annular oil passages increase the heat exchange area of the stator iron core, and the heat dissipation efficiency is high. At the same time, this stator structure is a new structure with low cost and balanced end cooling. By changing the oil inlet, the upper and lower oil diversion paths inside the housing can be adjusted to reduce the flow resistance difference, and the spraying effect is good, and the adaptability is more flexible; in addition, the cooling path is formed inside the rotating shaft and the balance plates at both ends to spray the inner side of the winding, further improving the heat dissipation effect. The balance plates, the cooling sleeve, the housing and the oil retaining ring form a closed-loop oil path, meeting the heat dissipation requirements of various oil-cooled motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

[0020] Figure 2 and Figure 3 are the sectional structural schematic diagrams of the present invention from two different angles;

[0021] Figure 4 and Figure 5It is an exploded structural schematic diagram of the housing, end plate and oil baffle ring of the present invention from two different angles;

[0022] Figure 6 It is a structural schematic diagram of the oil baffle ring of the present invention;

[0023] Figure 7 It is a structural schematic diagram of the stator core and cooling jacket of the present invention;

[0024] Figure 8 It is an exploded structural schematic diagram of the stator core and cooling jacket of the present invention;

[0025] Figure 9 It is a structural schematic diagram of the end-face oil-injected iron core punching sheet of the present invention;

[0026] Figure 10 It is a structural schematic diagram of the oil channel iron core of the present invention;

[0027] Figure 11 It is a schematic diagram of the flow domain of the coolant in the cooling jacket of the present invention;

[0028] Figure 12 It is a schematic diagram of the flow domain of the coolant between three oil channel shunt punching sheets of the present invention;

[0029] Figure 13 It is a schematic diagram of a distribution of three oil channel shunt punching sheets of the present invention;

[0030] Figure 14 It is another schematic diagram of a distribution of three oil channel shunt punching sheets of the present invention;

[0031] Figure 15 It is a structural schematic diagram of components such as the rotating shaft, rotor core, balance plate and bearing of the present invention;

[0032] Figure 16 It is a sectional structural schematic diagram of components such as the rotating shaft, rotor core, balance plate and bearing of the present invention;

[0033] Figure 17 It is a structural schematic diagram of components such as the rotating shaft, balance plate and bearing of the present invention.

[0034] The reference numerals are: 1, stator core; 2, winding; 3, cooling jacket; 30, coolant inlet pipe; 31, end face oil injection iron core punch; 311, oil injection hole; 312, long strip hole; 313, short strip hole; 32, oil duct iron core; 320, coolant basin; 321, notch; 322, oil duct hole; 33, oil duct shunt punch; 331, shunt hole; 4, housing; 40, coolant inlet; 41, oil retaining ring; 410, oil retaining piece; 42, electric control box body; 40, side wall oil inlet; 44, flange; 43, side wall oil circuit; 411, support ring; 412, notch; 413, inner oil retaining part; 414, outer convex rib; 5, end plate; 50, oil inlet pipeline; 51, oil return pipe; 52, positioning convex ring; 6, rotating shaft; 61, oil throwing hole A; 62, shaft shoulder; 7, rotor core; 8, balance plate; 81, oil throwing hole B; 82, radial oil circuit; 9, rotor cooling oil pipe; 10, retaining ring; 11, bearing. Detailed implementation manners

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0036] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "a plurality of" means two or more, unless otherwise clearly defined.

[0039] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0042] As Figures 1 to 6 shown, an oil-cooled motor with a stator stepped oil circuit includes a housing 4, an end plate 5, a stator and a rotor. An electric control box body 42 is provided at one end of the housing 4, and a motor controller is fixed inside the electric control box. The other end of the housing 4 is fixedly connected to the end plate 5 by bolts. The stator is fixed inside the housing 4, and the rotor is arranged inside the stator. The rotor includes a rotating shaft 6 and a rotor core 7. Both ends of the rotating shaft 6 are rotatably connected to the housing 4 and the end plate 5 through bearings 11 respectively. The stator includes a winding 2 and a stator core 1. The winding 2 is inserted into the stator core 1. The winding 2 is formed by connecting a plurality of flat wire conductors, and at one end of the stator core 1, the winding is led out through a bus bar flat wire and three-phase lead-out wires.

[0043] A cooling sleeve 3 is further provided outside the stator core 1. At least one end inside the housing 4 is also provided with an oil baffle ring 41. The end plate 5 is fixed to one end of the housing 4 by bolts. The oil baffle ring 41 is clamped between the housing 4 and the end plate 5. At least a part of the inner side of the oil baffle ring 41 extends inward to form an inner oil baffle portion 413, and the position of the inner oil baffle portion 413 corresponds to the position of the oil injection hole 311.

[0044] The oil baffle ring 41 includes a support ring 411 and an outer convex rib 414 provided on the outer side wall of the support ring 411. One end of the inner wall of the housing 4 is also provided with a convex edge 44, and the outer convex rib 414 is placed on the convex edge 44. On the side of the end plate 5 in contact with the housing 4, there is also a positioning convex ring 52, and the positioning convex ring 52 presses against the outer convex rib 414.

[0045] During installation, the inner oil baffle portion 413 of the oil baffle ring 41 is adjusted to the upper side, and the side of the outer convex rib of the oil baffle ring 41 is abutted against the convex edge of the housing. Finally, during the process of fixing the end plate to the housing, the positioning convex ring on the end plate will press the other side of the outer convex rib of the oil baffle ring 41. The whole assembly process is relatively simple, and this structure blocks the coolant sprayed from both ends of the stator core, and then falls onto the winding under the action of gravity to cool the winding, improving the cooling efficiency.

[0046] The support ring 411 is also provided with a notch 412, and the length and position of the notch 412 correspond to the length and position of the inner oil baffle portion 413. The other end of the inner wall of the housing 4 is also provided with an oil baffle piece 410, and the circumferential position of the oil baffle piece 410 is the same as the circumferential position of the inner oil baffle portion 413. The oil baffle piece 410 and the convex edge 44 are integrally formed with the housing 4. The setting of the notch can avoid the blocking of the cooling oil by part of the support ring 411, thereby preventing the cooling oil from falling to other positions outside the winding.

[0047] The specific structure of the cooling sleeve 3 is as Figures 7 to 12 shown. The cooling sleeve 3 is provided with multiple annular oil circuits inside. Each annular oil circuit reciprocates and rotates along the axial direction, and adjacent annular oil circuits are interconnected. The outer edges of both end faces of the cooling sleeve 3 are evenly spaced with a plurality of oil injection holes 311. The plurality of oil injection holes 311 are arranged in an arc shape, and the included angle between the oil injection holes 311 at both ends of the arc and the center of the circle is 60° - 180°. The annular oil circuits at both ends are communicated with the oil injection holes 311. A side wall oil inlet 40 is also opened on the housing 4, and the side wall oil inlet 40 is communicated with the annular oil circuit.

[0048] An oil inlet pipeline 50 is provided on the end plate 5. The main housing 4 is further provided with a side wall oil passage 43. One end of the side wall oil passage 43 is communicated with the oil inlet pipeline 50, and the other end of the side wall oil passage 43 forms a side wall oil inlet 40. The cooling oil in the stator core is introduced through the oil passage on the housing and is cooled and recycled outside the housing to ensure that the motor still has a good heat dissipation effect after long-term operation.

[0049] In the present invention, by adjusting the ribs at the mating surface of the housing 4 to support the oil baffle ring 41 or adding SMC injection-molded oil baffle sheets, the shapes of the oil baffle ring and the oil baffle sheets are flexible, which can effectively block the sprayed oil liquid on the end face of the stator core and perform secondary oil distribution, saving the end oil guiding components, with simple implementation, low processing cost, and good spraying effect.

[0050] The cooling sleeve includes an annular oil passage core 32. A notch 321 is provided on the side wall of the oil passage core 32. The oil passage core 32 is provided with a plurality of axially extending oil passage holes 322 at circumferential intervals. The oil passage holes 322 of two adjacent oil passage cores 32 are arranged in a staggered manner, so that all the oil passage holes 322 and the notches are communicated to form an annular oil passage. Each oil passage core 32 is provided with a notch 321, and the notches 321 on two adjacent oil passage cores 32 are spaced 180°. The coolant inlet 40 or the coolant inlet pipe 30 is communicated with the middle notch 321. Every two oil passage cores 32 in the cooling sleeve 3 are further provided with oil passage shunt washers 33. The oil passage shunt washer 33 is provided with a shunt hole 331, and the shunt hole 331 communicates two adjacent annular oil passages. The coolant basin 320 formed by the annular oil passage is as Figure 9 and Figure 10 shown.

[0051] As Figure 13 shown, the shunt holes 331 on a plurality of oil passage shunt washers 33 are arranged in a staggered manner; as a preferred solution, the shunt holes 331 on two adjacent oil passage shunt washers 33 are spaced 180°. The injection holes are arranged in the upper half of the stator core. When the coolant flows in from the notch of the middle oil passage core 32, the two side oil passage shunt washers 33 among the three oil passage shunt washers 33 are provided with shunt holes 331 at the lower part, and the middle oil passage shunt washer 33 is provided with a shunt hole 331 at the upper part. In this way, the coolant is axially shunted from the lower part of the cooling sleeve and sprays out from the injection holes at the upper part of the cooling sleeve after slowly filling the lower half of the cooling sleeve; this structure is a large flow resistance solution, corresponding to a small oil outlet speed at the core end face, and is applicable to the motor solution with a small end size.

[0052] As Figure 14As shown in the figure, when the coolant flows in from the notch of the oil duct iron core 32 in the middle, the two oil duct shunt laminations 33 on both sides among the three oil duct shunt laminations 33 are provided with shunt holes 331 at the upper part, and the middle oil duct shunt lamination 33 is provided with shunt holes 331 at the lower part. In this way, the coolant is axially shunted from the upper part of the cooling jacket. When the coolant fills the annular oil circuit in the middle part, it can be shunted from the two upper shunt holes and then directly sprayed out from the spray holes at the upper part of the cooling jacket. This structure is a small flow resistance scheme, corresponding to a large oil outlet speed at the iron core end face, and is applicable to the motor scheme with large end dimensions.

[0053] The above structure can adapt to the adjustment of the oil inlet position of the client to the greatest extent. It can fully adjust the number, size and spatial distribution of the axially series-parallel oil holes according to the oil inlet position, and then adjust the flow resistance of the entire oil circuit to meet the distribution of the spray oil amount at the front and rear ends.

[0054] The novel spiral "Z"-shaped oil duct area in the present invention can flexibly adapt to the change of external oil pressure, adjust the number of parallel connections of the Z-shaped oil ducts, and has the following characteristics: 1. This structure has relatively small overall flow resistance, large heat exchange area and high heat dissipation efficiency. All the oil ducts can be located at the outer diameter of the yoke part of the stator iron core of the machine, avoiding the deterioration of the electromagnetic performance and iron loss of the motor; 2. The structure proposed in the present invention has little influence on the silicon steel sheet itself and little influence on the electromagnetic performance while effectively cooling the stator components of the motor; it takes into account cooling and electromagnetic performance to the greatest extent; at the same time, there are fewer silicon steel sheet types and fewer molds, and the process cost has more advantages.

[0055] The cooling jacket of the present invention further includes an end face spray iron core lamination 31. The spray holes 311 are arranged on the end face spray iron core lamination 31, and a plurality of long strip holes 312 and a plurality of short strip holes 313 are also arranged on the end face spray iron core lamination 31. A plurality of end face spray iron core laminations 31 are stacked with each other in a deflected manner to form an end face spray iron core, and the coolant in the annular oil circuit can only be sprayed out from the spray holes 311 of the end face spray iron core.

[0056] The stator iron core 1 and the cooling jacket 3 are integrally formed and are both formed by stacking a plurality of laminations. The stator iron core can realize a very flexible oil circuit series-parallel structure with only 3 types of laminations, realize a "Z"-shaped oil duct, with adjustable flow resistance, large heat exchange area and high heat dissipation efficiency; it can better adapt to the flexible adjustment of the customer boundary. Only by correspondingly adjusting the spatial position of the axial oil holes between the laminations can the effective spraying of the oil liquid be realized.

[0057] The novel "Z"-shaped stator oil circuit with low cost and strong compatibility proposed by the present invention not only has a flexible oil inlet position, can conveniently adjust the upper and lower oil distribution paths inside the housing to reduce the flow resistance difference, and has a good spraying effect; moreover, the combination between the iron core lamination types of the present invention is flexible, and the "Z"-shaped oil duct can be adjusted more flexibly.

[0058] Such as Figures 15 to 17As shown, the inside of the rotating shaft 6 is hollow, and an oil slinging hole A61 is provided on the side wall of the rotating shaft 6. On both sides of the rotor core 7 are balance plates 8. A plurality of oil slinging holes B81 facing the inside of the winding 2 are provided on the outer edge of the balance plate 8, and a radial oil passage 82 is further provided on the balance plate 8. The radial oil passage 82 connects the oil slinging hole A61 and the oil slinging hole B81.

[0059] An axle shoulder 62 and a steel pressing ring are further provided on the rotating shaft 6. The balance plate 8 on one side of the rotor core 7 abuts against the axle shoulder 62, and the balance plate 8 on the other side of the rotor core 7 abuts against the axle shoulder 62. Both ends of the rotating shaft 6 are rotatably connected to the housing 4 and the end plate 5 through bearings 11 respectively, and a retaining ring 10 for preventing the bearings 11 from moving axially is further provided on the rotating shaft. A plurality of limiting teeth are arranged at intervals on the retaining ring 10, and a ring groove is provided on the rotating shaft. The limiting teeth are embedded in the ring groove.

[0060] An oil-cooled motor with a stator stepped oil passage according to the present application further includes a rotor cooling oil pipe 9. One end of the rotating shaft 6 is open, the rotor cooling oil pipe 9 is inserted and fixed on the housing 4, and the rotor cooling oil pipe 9 extends into the rotating shaft 6.

[0061] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An oil-cooled motor with a stator stepped oil circuit, comprising a housing (4), an end plate (5), a stator and a rotor, wherein the stator is fixed in the housing (4), the rotor is arranged in the stator, and the two ends are respectively rotatably connected to the housing (4) and the end plate (5), the stator comprises a winding (2) and a stator core (1), the winding (2) is inserted in the stator core (1), and is characterized in that: A cooling jacket (3) is also provided outside the stator core (1), and a plurality of annular oil circuits are provided inside the cooling jacket (3), each annular oil circuit reciprocates in the axial direction, and adjacent annular oil circuits are interconnected. Multiple oil spray holes (311) are evenly spaced on the outer edges of the two end surfaces of the cooling jacket (3), and the multiple oil spray holes (311) are arranged in an arc shape, and the angle between the oil spray holes (311) at the two ends of the arc and the center of the circle is 60° to 180°, and the annular oil circuits at the two ends are connected to the oil spray holes (311). A side wall oil inlet (40) is also provided on the shell (4), and the side wall oil inlet (40) is connected to the annular oil circuit; at least one end of the shell (4) is also provided with an oil retaining ring (41), and the end plate (5) is fixed to the shell (4) by bolts. At one end, the oil retaining ring (41) is sandwiched between the housing (4) and the end plate (5), and at least a portion of the inner side of the oil retaining ring (41) extends inward to form an inner oil retaining portion (413), and the inner oil retaining portion (413) corresponds to the position of the oil injection hole (311); the rotor comprises a rotating shaft (6) and a rotor core (7), the rotating shaft (6) is hollow inside, and an oil-swinging hole A (61) is provided on the side wall of the rotating shaft (6), and the two sides of the rotor core (7) are balancing plates (8), and the outer edge of the balancing plate (8) is provided with a plurality of oil-swinging holes B (81) facing the inner side of the winding (2), and the balancing plate (8) is also provided with a radial oil passage (82), and the radial oil passage (82) connects the oil-swinging hole A (61) and the oil-swinging hole B (81).

2. The oil-cooled motor with a stator stepped oil circuit according to claim 1, characterized in that: The oil retaining ring (41) comprises a support ring (411) and an outer ridge (414) arranged on the outer side wall of the support ring (411); one end of the inner wall of the shell (4) is also provided with a ridge (44), and the outer ridge (414) rests on the ridge (44); a positioning ridge (52) is also provided on the side of the end plate (5) that contacts the shell (4), and the positioning ridge (52) is pressed against the outer ridge (414).

3. A motor housing with an oil retaining ring according to claim 2, characterized in that: An oil baffle ring (41) is provided at one end of the inner wall of the housing (4), and an oil baffle sheet (410) is provided at the other end; the circumferential position of the oil baffle sheet (410) is the same as the circumferential position of the inner oil baffle portion (413); the oil baffle sheet (410) and the convex edge (44) are integrally formed with the housing (4).

4. The oil-cooled motor with a stator stepped oil circuit according to claim 1, characterized in that: The cooling sleeve comprises an annular oil channel core (32), a notch (321) is provided on the side wall of the oil channel core (32), a plurality of oil channel holes (322) extending axially are arranged at intervals along the circumferential direction of the oil channel core (32), and the oil channel holes (322) of two adjacent oil channel cores (32) are arranged in a staggered manner so that all the oil channel holes (322) and the notch are interconnected to form an annular oil path.

5. The oil-cooled motor with stator stepped oil circuit according to claim 4, characterized in that: A notch (321) is provided on each oil channel iron core (32), and the notches (321) on two adjacent oil channel iron cores (32) are spaced 180 degrees apart.

6. The oil-cooled motor with stator stepped oil circuit according to claim 4, characterized in that: An oil channel flow splitting punch (33) is also provided every two oil channel iron cores (32) in the cooling jacket (3), and a flow splitting hole (331) is provided on the oil channel flow splitting punch (33). The flow splitting hole (331) enables two adjacent annular oil channels to communicate with each other.

7. The oil-cooled motor with stator stepped oil circuit according to claim 6, characterized in that: The flow diversion holes (331) on the plurality of oil channel flow diversion punching sheets (33) are arranged in a staggered manner.

8. The oil-cooled motor with stator stepped oil circuit according to claim 1, characterized in that: The cooling sleeve also includes an end face oil-spraying iron core punch (31), the oil-spraying hole (311) is arranged on the end face oil-spraying iron core punch (31), and the end face oil-spraying iron core punch (31) is also provided with a plurality of long holes (312) and a plurality of short holes (313), and the plurality of end face oil-spraying iron core punches (31) are mutually deflected and stacked to form an end face oil-spraying iron core, so that the coolant can only be sprayed out from the oil-spraying hole (311) of the end face oil-spraying iron core.

9. The oil-cooled motor with a stator stepped oil circuit according to claim 1, characterized in that: The rotating shaft (6) is also provided with a shaft shoulder (62) and a steel pressure ring. The balance plate (8) on one side of the rotor core (7) abuts against the shaft shoulder (62), and the balance plate (8) on the other side of the rotor core (7) abuts against the shaft shoulder (62). The two ends of the rotating shaft (6) are rotatably connected to the housing (4) and the end plate (5) through bearings (11), respectively. The rotating shaft is also provided with a retaining ring (10) to prevent the bearing (11) from moving. A plurality of limiting teeth are arranged at intervals on the retaining ring (10). The rotating shaft is provided with an annular groove, and the limiting teeth are embedded in the annular groove.

10. The oil-cooled motor with stator stepped oil circuit according to claim 1, characterized in that: It also includes a rotor cooling oil pipe (9), one end of the rotating shaft (6) is open, the rotor cooling oil pipe (9) is inserted and fixed on the housing (4), and the rotor cooling oil pipe (9) extends into the rotating shaft (6).

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