Stator assembly for oil-cooled driving motor and oil-cooled driving motor

Abstract

The utility model relates to the technical field of vehicle motors, in particular to a stator assembly for an oil-cooled driving motor and the oil-cooled driving motor comprising the stator assembly. The stator assembly comprises a stator iron core, a stator winding and oil injection rings arranged at two end sides of the stator iron core, the stator iron core is provided with a first iron core section, two second iron core sections located at two end sides of the first iron core section, and two third iron core sections located at one sides, far away from the first iron core section, of the two second iron core sections; the first iron core section is provided with a series oil channel and an oil inlet which extend in the circumferential direction, the second iron core section is provided with a plurality of parallel oil channels communicated with the series oil channel at intervals in the circumferential direction, the third iron core section is provided with a plurality of oil passing channels at intervals in the circumferential direction, and one oil passing channel corresponds to and communicates with the multiple parallel oil channels. A plurality of oil outlets are formed in the oil injection ring in the circumferential direction at intervals, and one oil passing channel corresponds to and communicates with at least one oil outlet. The temperature of the stator iron core and the stator winding end part can be effectively reduced so as to improve the power density of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors for vehicles, and in particular to a stator assembly for an oil-cooled drive motor and an oil-cooled drive motor comprising the stator assembly for the oil-cooled drive motor. Background Art

[0002] The drive motor is the power source of the core drive unit of electric vehicles. An important indicator of whether the drive motor system can meet the design and working requirements is whether the temperature rise of each part of the drive motor system does not exceed the temperature rise limit during test verification and actual operation. The temperature rise restricts the power density of the drive motor system, and its core task is to do a good job of thermal management of the motor. Compared with the water-cooled motor cooling system, the oil-cooled electric drive system has a better cooling effect because the cooling oil can directly contact the motor heating units such as the winding, which can effectively improve the power density of the motor and is increasingly widely used in electric drive systems. With the increasing application of oil-cooled drive motors, how to enhance its cooling effect to further improve the power density of the motor has become an urgent problem to be solved. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a stator assembly for an oil-cooled drive motor, which can effectively reduce the temperature of the stator core and the end of the stator winding to improve the power density of the motor.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model provides a stator assembly for an oil-cooled drive motor, comprising a stator core with tooth slots, a stator winding wound on the tooth slots and an oil injection ring arranged at two end sides of the stator core, the stator winding having two end portions respectively located at two end sides of the stator core and corresponding to the oil injection ring, the stator core having a first core segment located in the middle, two second core segments respectively located at two end sides of the first core segment and two third core segments respectively located at one side of the two second core segments away from the first core segment, a series oil passage extending in a circumferential direction and an oil inlet connected to the series oil passage are provided on the first core segment, a plurality of parallel oil passages are provided at intervals along the circumferential direction on the second core segment, each parallel oil passage is connected to the series oil passage, a plurality of oil passages are provided at intervals along the circumferential direction on the third core segment, one oil passage corresponds to and is connected to a plurality of parallel oil passages, a plurality of oil outlets are provided at intervals along the circumferential direction on the oil injection ring, one oil passage corresponds to and is connected to at least one oil outlet.

[0006] Preferably, the first core segment includes two first punch segments formed by axially stacking a plurality of first punches in sequence, and the outer periphery of the first punches is provided with a plurality of long grooves and a plurality of connecting holes arranged alternately in the circumferential direction. The first punch segments are provided with an oil inlet groove formed by a plurality of long grooves connected in sequence and a connecting channel formed by a plurality of connecting holes connected in sequence. The two first punch segments are connected relative to each other in the axial direction and rotated relative to each other at an angle in the circumferential direction, so that the two opposite oil inlet grooves on the two first punch segments are staggered and connected to form Z-shaped grooves, and adjacent Z-shaped grooves are connected through two opposite connecting channels on the first punch segments to form a series oil channel, and one or more Z-shaped grooves are used as oil inlets.

[0007] Preferably, the second core segment is formed by stacking a plurality of second punching sheets in sequence along the axial direction, a plurality of small grooves are provided on the outer periphery of the second punching sheets at intervals in the circumferential direction, and the parallel oil passages on the second core segment are formed by connecting a plurality of small grooves in sequence.

[0008] Preferably, the third core segment is formed by stacking a plurality of third punching sheets in sequence along the axial direction, a plurality of long holes are provided on the outer periphery of the third punching sheets at intervals in the circumferential direction, and the oil passage on the third core segment is formed by connecting a plurality of long holes in sequence.

[0009] Preferably, a plurality of oil inlet grooves are provided at intervals in the circumferential direction on one side of the oil injection ring close to the stator core, an oil passage corresponds to and is connected to at least one oil inlet groove, and a boss is provided on one side of the oil injection ring away from the stator core at a position corresponding to each oil inlet groove, an oil outlet channel is provided inside the boss, one end of the oil outlet channel is connected to the oil inlet groove, and the other end passes through the boss to form an oil outlet.

[0010] Preferably, the axis of the oil outlet extends along the axial direction or radial direction of the oil injection ring.

[0011] Preferably, the position of the boss on the oil injection ring corresponds to the position of the tooth slot on the stator core.

[0012] Preferably, the oil spray ring is made by injection molding.

[0013] Preferably, the oil injection ring and the stator core are fixed by adhesive bonding or mechanical connection.

[0014] The utility model also provides an oil-cooled drive motor, comprising the stator assembly for the oil-cooled drive motor as described above.

[0015] Compared with the prior art, the present invention has significant improvements:

[0016] The stator assembly for the oil-cooled drive motor of the utility model realizes that after the oil enters the cooling oil circuit, the oil flows in series along the circumference and in parallel along the axial direction on the stator core to fully cool the stator core, and then is sprayed to the two ends of the stator winding through the oil spray rings on both sides to spray cool the two ends of the stator winding, which can effectively reduce the temperature of the stator core and the stator winding ends to improve the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a stator assembly for an oil-cooled drive motor according to an embodiment of the utility model.

[0018] Figure 2 It is a structural schematic diagram of a stator core in a stator assembly for an oil-cooled drive motor according to an embodiment of the utility model.

[0019] Figure 3 It is a structural schematic diagram of a first punching sheet in a stator assembly for an oil-cooled drive motor according to an embodiment of the utility model.

[0020] Figure 4 It is a structural schematic diagram of a second punching sheet in a stator assembly for an oil-cooled drive motor according to an embodiment of the utility model.

[0021] Figure 5 It is a structural schematic diagram of the third punching sheet in the stator assembly for the oil-cooled drive motor of the embodiment of the utility model.

[0022] Figure 6 It is a structural schematic diagram of a side surface of an oil injection ring in one embodiment of a stator assembly for an oil-cooled drive motor in an embodiment of the utility model. In the figure, the oil outlet on the oil injection ring is an axial oil outlet.

[0023] Figure 7 yes Figure 6 A schematic structural diagram of another side of the fuel injection ring is shown in FIG.

[0024] Figure 8 It is a structural schematic diagram of an oil injection ring of another embodiment in the stator assembly for an oil-cooled drive motor of an embodiment of the utility model. In this figure, the oil outlet on the oil injection ring is a radial oil outlet.

[0025] The reference numerals are described as follows:

[0026] 1 Stator core

[0027] 1a Tooth groove

[0028] 11 First core section

[0029] 11a Oil inlet

[0030] 11b First rush segment

[0031] 110 First punch

[0032] 111 Long groove

[0033] 112 connecting hole

[0034] 113 Oil inlet tank

[0035] 114 connecting channel

[0036] 115 Z-groove

[0037] 12 Second core segment

[0038] 12a Parallel oil passage

[0039] 120 Second punch

[0040] 121 small groove

[0041] 13 The third core segment

[0042] 13a Oil passage

[0043] 130 Third punch

[0044] 131 Long hole

[0045] 2 Stator winding

[0046] 3 Injection ring

[0047] 3a Oil outlet

[0048] 31 Oil inlet groove

[0049] 32 Boss DETAILED DESCRIPTION

[0050] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0054] like Figures 1 to 8 The figure shows an embodiment of a stator assembly for an oil-cooled drive motor provided by the utility model.

[0055] See also Figure 1 and Figure 2 The stator assembly for the oil-cooled drive motor of this embodiment includes a stator core 1, a stator winding 2 and an oil injection ring 3. The stator core 1 has a tooth slot 1a. The stator winding 2 is wound on the tooth slot 1a of the stator core 1. The stator winding 2 has two ends. The two ends of the stator winding 2 are respectively located at the two end sides of the stator core 1. Two oil injection rings 3 are provided. The two oil injection rings 3 are respectively arranged at the two end sides of the stator core 1, and the two ends of the stator winding 2 correspond to the two oil injection rings 3. Preferably, the oil injection ring 3 is made by injection molding, and the injection molded oil injection ring 3 and the stator core 1 are preferably fixed by adhesive bonding. In other embodiments, the oil injection ring 3 and the stator core 1 can also be fixed by mechanical connection.

[0056] The stator core 1 comprises a first core segment 11 located in the middle, two second core segments 12 located at both ends of the first core segment 11, and two third core segments 13 located at one side of the two second core segments 12 away from the first core segment 11. The first core segment 11 and the second core segment 12, and the second core segment 12 and the third core segment 13 are all connected and fixed relative to each other along the axial direction of the stator core 1, and are connected in sequence in the order of one third core segment 13, one second core segment 12, the first core segment 11, another second core segment 12, and another third core segment 13 to form the overall structure of the stator core 1, and the two injection rings 3 are respectively connected and fixed to the side surfaces of the two third core segments 13 away from the second core segment 12.

[0057] The first core segment 11 is provided with a series oil passage and an oil inlet 11a. The series oil passage on the first core segment 11 extends along the circumference of the first core segment 11. Preferably, the series oil passage is connected end to end along the circumference of the first core segment 11 to form a circle. The oil inlet 11a on the first core segment 11 is connected to the series oil passage, and is used to input cooling oil into the series oil passage, and the cooling oil flows in series along the circumference of the first core segment 11 through the series oil passage.

[0058] A plurality of parallel oil passages 12a are provided at intervals along the circumferential direction on the second core segment 12. Preferably, the parallel oil passages 12a extend along the axial direction of the second core segment 12 and penetrate through both ends of the second core segment 12. One end of each parallel oil passage 12a close to the first core segment 11 is connected to the series oil passage on the first core segment 11. The cooling oil flowing in series along the circumference of the first core segment 11 in the series oil passage on the first core segment 11 can simultaneously enter each parallel oil passage 12a on the second core segment 12 at both ends of the first core segment 11, thereby flowing in parallel along the axial direction of the second core segment 12.

[0059] A plurality of oil passages 13a are provided at intervals along the circumferential direction on the third core segment 13, and the oil passages 13a penetrate through both ends of the third core segment 13 along the axial direction of the third core segment 13. Preferably, the oil passages 13a are long annular oil passages extending along the circumferential direction of the third core segment 13. One oil passage 13a on the third core segment 13 corresponds to and communicates with a plurality of parallel oil passages 12a on the second core segment 12, and the cooling oil flowing in parallel along the axial direction of the second core segment 12 in each parallel oil passage 12a on the second core segment 12 can flow into the corresponding oil passage 13a, and one oil passage 13a collects the cooling oil in a plurality of parallel oil passages 12a, thereby playing an oil collecting role.

[0060] A plurality of oil outlets 3a are provided on the oil injection ring 3 at intervals in the circumferential direction. An oil passage 13a on the third core segment 13 corresponds to and is connected to at least one oil outlet 3a on the oil injection ring 3. The cooling oil collected in the oil passage 13a can be sprayed toward the corresponding end of the stator winding 2 through the oil outlet 3a on the oil injection ring 3.

[0061] In summary, the cooling oil circuit of the stator assembly for the oil-cooled drive motor of the present embodiment is as follows: oil enters from the oil inlet 11a on the first core segment 11 in the middle of the stator core 1, and the cooling oil realizes circumferential series flow through the series oil channels on the first core segment 11, and at the same time enters the parallel oil channels 12a on the second core segments 12 on both ends of the first core segment 11, and realizes axial parallel flow through the parallel oil channels 12a on the second core segments 12 on both sides, and then respectively enters the oil passages 13a on the third core segments 13 on both sides for collection, and finally sprays to the corresponding ends of the stator winding 2 through the oil outlets 3a on the oil injection rings 3 on both sides. Therefore, the stator assembly for the oil-cooled drive motor of this embodiment realizes that after the oil enters the cooling oil circuit, it flows in series along the circumference and in parallel along the axial direction on the stator core 1 to fully cool the stator core 1, and then sprays to the two ends of the stator winding 2 through the oil spray rings 3 on both sides to spray cool the two ends of the stator winding 2, which can effectively reduce the temperature of the stator core 1 and the ends of the stator winding 2 to improve the power density of the motor.

[0062] See also Figure 2 and Figure 3 In this embodiment, preferably, the first core segment 11 includes two first punch segments 11b, and the two first punch segments 11b are formed by stacking a plurality of first punches 110 in sequence along the axial direction. A plurality of long grooves 111 and a plurality of connecting holes 112 are provided on the outer periphery of the first punch 110, and the plurality of long grooves 111 and the plurality of connecting holes 112 are arranged alternately in sequence along the circumference of the first punch 110, and each long groove 111 and each connecting hole 112 penetrates through both sides of the first punch 110 in the axial direction of the first punch 110. A plurality of oil inlet grooves 113 formed by connecting a plurality of long grooves 111 in sequence and a plurality of connecting channels 114 formed by connecting a plurality of connecting holes 112 in sequence are formed on the first punch segment 11b formed by stacking a plurality of first punches 110 in sequence along the axial direction, and each oil inlet groove 113 and each connecting channel 114 penetrate through both ends of the first punch segment 11b in the axial direction of the first punch segment 11b. The two first punch segments 11b are connected axially and rotated relative to each other by an angle along the circumferential direction, so that the two opposite oil inlet grooves 113 on the two first punch segments 11b are staggered and connected to form a Z-shaped groove 115. At the same time, the two opposite connecting channels 114 on the two first punch segments 11b are staggered and connected, and the adjacent Z-shaped grooves 115 are connected through the two opposite connecting channels 114 on the two first punch segments 11b, thereby forming a series oil channel on the first core segment 11, realizing the series flow of cooling oil in the circumferential direction of the first punch segment 11b, and covering the circumferential surface of the first punch segment 11b with a large area, so as to fully cool the first punch segment 11b. Preferably, one or more Z-shaped grooves 115 can be used as the oil inlet 11a on the first core segment 11.

[0063] Preferably, the long groove 111 and the connecting hole 112 are both long rings extending along the circumference of the first punch 110, and the mid-circumference lines of the long groove 111 and the connecting hole 112 are located on the same circumference. The long groove 111 is a long ring groove formed by the outer circumference of the first punch 110 being recessed inward, so that the oil inlet groove 113 formed on the first punch segment 11b is a long ring oil inlet groove recessed inward on the outer circumference of the first punch segment 11b, and the oil inlet groove 113 forms an oil passage with openings at both ends together with the inner circumference of the motor housing when the stator assembly is assembled with the motor housing. The connecting hole 112 is a long ring through hole opened on the outer circumference of the first punch 110 near the outer circumference, so that the connecting channel 114 formed on the first punch segment 11b is a long ring connecting channel opened near the outer circumference of the yoke of the first punch segment 11b.

[0064] See also Figure 2 and Figure 4 In this embodiment, preferably, the second core segment 12 is formed by stacking a plurality of second punching sheets 120 in sequence along the axial direction, and a plurality of small grooves 121 are provided at intervals along the circumferential direction on the outer peripheral edge of the second punching sheet 120, and each small groove 121 penetrates through both sides of the second punching sheet 120 in the axial direction of the second punching sheet 120. The parallel oil passages 12a on the second core segment 12 formed by stacking a plurality of second punching sheets 120 in sequence along the axial direction are formed by connecting a plurality of small grooves 121 in sequence, and the parallel oil passages 12a extend in the axial direction of the second core segment 12 and penetrate through both ends of the second core segment 12. The dimension of a single small groove 121 extending in the circumferential direction of the second punching sheet 120 is smaller than the dimension of a single long groove 111 extending in the circumferential direction of the first punching sheet 110, and is also smaller than the dimension of the connecting hole 112 extending in the circumferential direction of the first punching sheet 110. A plurality of small grooves 121 are respectively provided on the second punching sheet 120 at positions corresponding to the long groove 111 and the connecting hole 112 on the first punching sheet 110, so that an oil inlet groove 113 and a connecting channel 114 on the first punching segment 11b respectively correspond to and connect to a plurality of parallel oil passages 12a on the second core segment 12. Preferably, the small groove 121 is a groove formed by an inward depression on the outer circumference of the second punching sheet 120, so that the parallel oil passages 12a on the second core segment 12 are axial parallel oil passages formed by an inward depression on the outer circumference of the second core segment 12, and the parallel oil passages 12a form oil passages with both ends open together with the inner circumference of the motor housing when the stator assembly is assembled with the motor housing.

[0065] See also Figure 2 and Figure 5In this embodiment, preferably, the third core segment 13 is formed by stacking a plurality of third punching sheets 130 in sequence along the axial direction, and a plurality of long holes 131 are provided on the outer peripheral edge of the third punching sheet 130 at intervals along the circumferential direction, and each long hole 131 penetrates through both sides of the third punching sheet 130 in the axial direction of the third punching sheet 130. The oil passage 13a on the third core segment 13 formed by stacking a plurality of third punching sheets 130 in sequence along the axial direction is formed by connecting a plurality of long holes 131 in sequence, and the oil passage 13a penetrates through both ends of the third core segment 13 in the axial direction of the third core segment 13. The dimension of a single long hole 131 extending in the circumferential direction of the third punching sheet 130 is greater than the dimension of a single small groove 121 extending in the circumferential direction of the second punching sheet 120. The second punching sheet 120 has a plurality of small grooves 121 at positions corresponding to the long holes 131 on the third punching sheet 130, so that an oil passage 13a on the third core segment 13 corresponds to and connects to a plurality of parallel oil passages 12a on the second core segment 12. Preferably, the long hole 131 is a long ring extending in the circumferential direction of the third punching sheet 130. Preferably, the long hole 131 is a long ring-shaped long hole opened on the outer periphery of the third punching sheet 130 near the outer cylindrical surface, so that the oil passage 13a formed on the third core segment 13 is a long ring-shaped oil passage opened on the yoke of the third core segment 13 near the outer cylindrical surface.

[0066] Optimally, in this embodiment, the stator core 2 as a whole is a six-segment structure formed by stacking the above three types of punching sheets, specifically: two first punching segments 11b formed by stacking the first punching sheets 110 in the axial direction, two second core segments 12 formed by stacking the second punching sheets 120 in the axial direction, and two third core segments 13 formed by stacking the third punching sheets 130 in the axial direction, and connected in sequence in the axial direction in the order of one third core segment 13, one second core segment 12, two first punching segments 11b (first core segment 11), another second core segment 12, and another third core segment 13, wherein the two first punching segments 11b are assembled after being rotated relative to each other by an angle in the circumferential direction. Preferably, all the punching sheets can be fixed into an integral stator core 2 structure by welding after being stacked.

[0067] In this embodiment, the length distribution of each punch segment (the first punch segment 11b, the second core segment 12 and the third core segment 13) in the axial direction is not limited, and can be flexibly adjusted and distributed according to actual flow resistance and heat dissipation requirements. Since each punch segment is formed by stacking corresponding punch sheets, the length distribution of each punch segment can be adjusted very conveniently and flexibly, so as to be well adapted to various usage requirements.

[0068] See also Figures 6 to 8In this embodiment, preferably, a plurality of oil inlet grooves 31 are provided at intervals in the circumferential direction on one side surface of the oil injection ring 3 close to the stator core 1, and an oil passage 13a corresponds to and is connected to at least one oil inlet groove 31. A boss 32 is provided at a position corresponding to each oil inlet groove 31 on the side surface of the oil injection ring 3 away from the stator core 1, and an oil outlet channel is provided inside the boss 32. One end of the oil outlet channel is connected to the oil inlet groove 31, and the other end of the oil outlet channel passes through the boss 32 to form an oil outlet 3a of the oil injection ring 3. As a result, the cooling oil collected in the oil passage 13a can flow into the oil inlet groove 31 on the oil injection ring 3, and be sprayed out from the oil outlet 3a through the oil outlet channel. Preferably, the oil outlet 3a is located on the side of the boss 32 close to the center of the oil injection ring 3. Figure 6 As shown, in one embodiment, the axis of the oil outlet 3a can extend along the axial direction of the oil injection ring 3 to form an axial oil outlet to achieve axial spraying of both ends of the stator winding 2. Figure 8 As shown, in another embodiment, the axis of the oil outlet 3 a may also extend radially along the oil injection ring 3 to form a radial oil outlet to achieve radial spraying of both ends of the stator winding 2 .

[0069] In this embodiment, the position of the boss 32 on the oil injection ring 3 can also be flexibly set according to the requirements of the heat dissipation effect to achieve uniform spraying of both ends of the stator winding 2. Preferably, the position of the boss 32 on the oil injection ring 3 corresponds to the position of the tooth slot 1a on the stator core 1, so as not to affect the operating space of the inserting die when the stator winding 2 is subsequently formed.

[0070] Based on the above-mentioned stator assembly for oil-cooled drive motor, the embodiment of the utility model further provides an oil-cooled drive motor. The oil-cooled drive motor of this embodiment includes the above-mentioned stator assembly for oil-cooled drive motor of this embodiment.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A stator assembly for an oil-cooled drive motor, characterized in that: The invention comprises a stator core (1) having tooth slots (1a), a stator winding (2) wound on the tooth slots (1a), and an oil injection ring (3) arranged at both ends of the stator core (1), wherein the stator winding (2) has two ends respectively located at both ends of the stator core (1) and corresponding to the oil injection ring (3), the stator core (1) comprises a first core segment (11) located in the middle, two second core segments (12) respectively located at both ends of the first core segment (11), and two third core segments (13) respectively located at one side of the two second core segments (12) away from the first core segment (11), the first core segment (11) and the second core segment (12) respectively located at the two ends of the first core segment (11). The core segment (11) is provided with a series oil passage extending in the circumferential direction and an oil inlet (11a) connected to the series oil passage; the second core segment (12) is provided with a plurality of parallel oil passages (12a) at intervals in the circumferential direction, each of the parallel oil passages (12a) is connected to the series oil passage; the third core segment (13) is provided with a plurality of oil passages (13a) at intervals in the circumferential direction, one of the oil passages (13a) corresponds to and is connected to the plurality of parallel oil passages (12a); the oil injection ring (3) is provided with a plurality of oil outlets (3a) at intervals in the circumferential direction, one of the oil passages (13a) corresponds to and is connected to at least one of the oil outlets (3a).

2. The stator assembly for an oil-cooled drive motor according to claim 1, characterized in that: The first core segment (11) comprises two first punch segments (11b) formed by stacking a plurality of first punch sheets (110) in sequence along the axial direction; a plurality of long grooves (111) and a plurality of connecting holes (112) arranged alternately in sequence along the circumferential direction are provided on the outer circumference of the first punch sheets (110); an oil inlet groove (113) formed by connecting a plurality of the long grooves (111) in sequence and a connecting channel (112) formed by connecting a plurality of the connecting holes (112) in sequence are formed on the first punch segment (11b); 4), the two first punch segments (11b) are connected to each other in the axial direction and rotated relative to each other in the circumferential direction by an angle, so that the two opposite oil inlet grooves (113) on the two first punch segments (11b) are staggered and connected to form a Z-shaped groove (115), and the adjacent Z-shaped grooves (115) are connected to each other through the two opposite connecting channels (114) on the first punch segments (11b) to form the series oil channel, and one or more Z-shaped grooves (115) serve as the oil inlet (11a).

3. The stator assembly for an oil-cooled drive motor according to claim 1, characterized in that: The second core segment (12) is formed by a plurality of second punching sheets (120) being stacked in sequence along the axial direction, a plurality of small grooves (121) are provided on the outer peripheral edge of the second punching sheet (120) at intervals in the circumferential direction, and the parallel oil passage (12a) on the second core segment (12) is formed by a plurality of the small grooves (121) being connected in sequence.

4. The stator assembly for an oil-cooled drive motor according to claim 1, characterized in that: The third core segment (13) is formed by a plurality of third punching sheets (130) being stacked in sequence along the axial direction, a plurality of long holes (131) are provided on the outer periphery of the third punching sheets (130) at intervals in the circumferential direction, and the oil passage (13a) on the third core segment (13) is formed by a plurality of the long holes (131) being connected in sequence.

5. The stator assembly for an oil-cooled drive motor according to claim 1, characterized in that: A plurality of oil inlet grooves (31) are provided at intervals along the circumferential direction on a side surface of the oil injection ring (3) close to the stator core (1); one of the oil passages (13a) corresponds to and is connected to at least one of the oil inlet grooves (31); a boss (32) is provided at a position corresponding to each of the oil inlet grooves (31) on a side surface of the oil injection ring (3) away from the stator core (1); an oil outlet channel is provided inside the boss (32); one end of the oil outlet channel is connected to the oil inlet groove (31), and the other end passes through the boss (32) to form the oil outlet (3a).

6. The stator assembly for the oil-cooled drive motor according to claim 5, characterized in that: The axis of the oil outlet (3a) extends along the axial direction or radial direction of the oil injection ring (3).

7. The stator assembly for an oil-cooled drive motor according to claim 5, characterized in that: The position of the boss (32) on the oil injection ring (3) corresponds to the position of the tooth slot (1a) on the stator core (1).

8. The stator assembly for an oil-cooled drive motor according to claim 1, characterized in that: The oil injection ring (3) is made by injection molding.

9. The stator assembly for an oil-cooled drive motor according to claim 1, characterized in that: The oil injection ring (3) and the stator core (1) are fixed to each other by adhesive bonding or mechanical connection.

10. An oil-cooled drive motor, characterized in that: It comprises a stator assembly for an oil-cooled drive motor as claimed in any one of claims 1 to 9.

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