Cooling system of oil cooling driving motor

Abstract

The utility model relates to the technical field of vehicle motors, in particular to an oil-cooled driving motor cooling system, which comprises a stator core and a stator winding. The stator iron core is provided with an oil inlet section located in the middle, two parallel oil section sections located at the two end sides of the oil inlet section respectively, two end oil collecting sections located on the sides, away from the oil inlet section, of the two parallel oil section sections respectively, and two end oil spraying sections located on the sides, away from the parallel oil section sections, of the two end oil collecting sections respectively. The oil inlet section is provided with an oil inlet channel extending in the circumferential direction, the parallel oil section is provided with a plurality of parallel oil channels at intervals in the circumferential direction, the parallel oil channels are communicated with the oil inlet channel, the end oil collecting section is provided with a plurality of oil collecting channels at intervals in the circumferential direction, and one oil collecting channel corresponds to and is communicated with the parallel oil channels. A plurality of oil outlet channels are formed in the end oil injection section in the circumferential direction at intervals, and one oil collecting channel corresponds to and communicates with at least one oil outlet channel. The structure is compact, cooling uniformity is good, and cooling oil utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle motors, in particular to an oil-cooled drive motor cooling system. 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. At present, the stator oil circuit of common oil-cooled motors is mostly external components that directly spray oil on the stator and winding ends, and rely on gravity to flow back to the oil collection tank to achieve cooling of the motor. This type of oil-cooled motor oil circuit structure has many parts. Due to the need to reserve the stator surface flow channel, the overall structure is not compact enough. Due to the effect of gravity, the cooling oil coverage at the bottom of the motor is uncontrollable, and it is necessary to increase the bottom oil immersion cooling, which increases the difficulty of controlling the oil tank liquid level. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide an oil-cooled drive motor cooling system with compact structure, good cooling uniformity and high cooling oil utilization rate.

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

[0005] The utility model provides an oil-cooled drive motor cooling system, comprising a stator core with tooth slots and a stator winding wound on the tooth slots, wherein two ends of the stator winding are respectively located at two end sides of the stator core, the stator core has an oil inlet section located in the middle, two parallel oil sections respectively located at two end sides of the oil inlet section, two end oil collecting sections respectively located at one side of the two parallel oil sections away from the oil inlet section, and two end oil injection sections respectively located at one side of the two end oil collecting sections away from the parallel oil section, an oil inlet passage extending in a circumferential direction is provided on the oil inlet section, a plurality of parallel oil passages are arranged at intervals along the circumferential direction on the parallel oil section, each parallel oil passage is connected to the oil inlet passage, a plurality of oil collecting passages are arranged at intervals along the circumferential direction on the end oil collecting section, one oil collecting passage corresponds to and is connected to a plurality of parallel oil passages, a plurality of oil outlet passages are arranged at intervals along the circumferential direction on the end oil injection section, one oil collecting passage corresponds to and is connected to at least one oil outlet passage.

[0006] Preferably, the oil inlet section includes two oil inlet punch segments formed by axially stacking a plurality of oil inlet punches in sequence, a plurality of long grooves are circumferentially spaced on the outer circumferential surface of the oil inlet punches, an oil inlet groove formed by a plurality of long grooves connected in sequence is formed on the oil inlet punch segment, the two oil inlet punch segments are axially connected to each other so that the two opposite oil inlet grooves on the two oil inlet punch segments are connected, and the oil inlet channel on the oil inlet section is composed of a plurality of pairs of oil inlet grooves arranged circumferentially.

[0007] Preferably, the two oil inlet punch segments are rotated relative to each other at an angle along the circumferential direction, so that the two opposite oil inlet grooves on the two oil inlet punch segments are staggered and connected, and the oil inlet grooves on one oil inlet punch segment correspond to and connect with each adjacent two oil inlet grooves on the other oil inlet punch segment in sequence, and all the oil inlet grooves are serpentinely connected in series along the circumferential direction of the oil inlet section to form an oil inlet channel.

[0008] Preferably, the oil inlet section includes two oil inlet punch segments formed by axially stacking a plurality of oil inlet punches in sequence, a plurality of long holes are circumferentially spaced on the outer periphery of the oil inlet punches, at least one long hole is provided with an oil inlet, and the oil inlet punch segments are provided with oil inlet channels formed by sequentially connecting a plurality of long holes and oil inlet channels formed by sequentially connecting a plurality of oil inlets, the two oil inlet punch segments are axially connected and circumferentially rotated relative to each other by an angle, so that the two opposite oil inlet channels on the two oil inlet punch segments are staggered and connected, and the oil inlet channels on one oil inlet punch segment correspond to and are connected to the two adjacent oil inlet channels on the other oil inlet punch segment in sequence, and all the oil inlet channels are serpentinely connected in series along the circumference of the oil inlet section to form an oil inlet channel.

[0009] Preferably, the parallel oil section is formed by a plurality of parallel oil punching sheets stacked in sequence along the axial direction, a plurality of parallel oil holes are provided on the outer periphery of the parallel oil punching sheets at circumferential intervals, and the parallel oil passages on the parallel oil section are formed by a plurality of parallel oil holes connected in sequence.

[0010] Preferably, the end oil collecting section is formed by a plurality of oil collecting punches stacked in sequence along the axial direction, a plurality of oil collecting holes are arranged on the outer periphery of the oil collecting punches at intervals in the circumferential direction, and the oil collecting channel on the end oil collecting section is formed by a plurality of oil collecting holes connected in sequence.

[0011] Preferably, the oil collecting hole includes a long annular hole portion and a vertical hole portion which are interconnected in a T shape, the long annular hole portion extends along the circumference of the oil collecting punch, and the vertical hole portion extends from the middle of the long annular hole portion toward the center of the oil collecting punch to a position corresponding to the oil outlet channel on the end injection section.

[0012] Preferably, the end injection section is formed by a plurality of injection punches stacked in sequence along the axial direction, a plurality of oil outlet holes are arranged on the outer peripheral edge of the injection punch at intervals in the circumferential direction, and the oil outlet channel on the end injection section is formed by a plurality of oil outlet holes connected in sequence.

[0013] Preferably, the plurality of oil outlet holes arranged at intervals along the circumferential direction on the outer circumference of the oil injection punch are located on the same circumferential line or on different circumferential lines.

[0014] Compared with the prior art, the present invention has significant improvements:

[0015] The oil-cooled drive motor cooling system of the utility model realizes that after the oil enters the cooling oil circuit, the oil flows along the circumference on the stator core and flows in parallel along multiple branches axially, and then is collected in the oil collecting channel on the end oil collecting section, so that the stator core can be fully cooled, and then the oil outlet channels on the end spray sections on both sides are directly sprayed axially to the roots of the two ends of the stator winding, so that the roots of the two ends of the stator winding can be evenly sprayed and cooled. The uniform spraying of the roots of the two ends of the stator winding can ensure the uniformity of the stator surface cooling without affecting the stator magnetic circuit too much, and can also realize the uniform spraying of the stator winding, while ensuring the full utilization of the cooling oil and reducing the loss of the oil pump. At the same time, the oil-cooled drive motor cooling system of the utility model directly sprays the roots of the two ends of the stator winding axially through the oil outlet channels on the end spray sections at both ends of the stator core, which is different from the conventional solution of adding oil spray rings at both ends of the stator core for radial spraying in the prior art, and eliminates the need for oil immersion cooling and other components, and has a more compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a first embodiment of the oil-cooled drive motor cooling system of the utility model.

[0017] Figure 2 It is a structural schematic diagram of a second embodiment of the oil-cooled drive motor cooling system of the utility model.

[0018] Figure 3 It is a structural schematic diagram of a first implementation mode of an oil inlet punch in an oil-cooled drive motor cooling system of the utility model.

[0019] Figure 4 It is a structural schematic diagram of a second implementation mode of the oil inlet punch in the oil-cooled drive motor cooling system of the utility model.

[0020] Figure 5 The utility model is a schematic diagram of the structure of the parallel oil circuit punching plate in the oil-cooled drive motor cooling system.

[0021] Figure 6 It is a structural schematic diagram of a first embodiment of an oil collecting punch in an oil-cooled drive motor cooling system of the utility model.

[0022] Figure 7 It is a structural schematic diagram of a second embodiment of an oil collecting punch in the oil-cooled drive motor cooling system of the utility model.

[0023] Figure 8 It is a structural schematic diagram of a first implementation mode of an oil-spraying punch in an oil-cooled drive motor cooling system of the utility model.

[0024] Fig. 9 It is a structural schematic diagram of a second implementation mode of the oil-spraying punching plate in the oil-cooled drive motor cooling system of the utility model.

[0025] The reference numerals are described as follows:

[0026] 1 Stator core

[0027] 1a Tooth groove

[0028] 11 Oil inlet section

[0029] 11a Oil inlet hole

[0030] 11b Oil inlet segment

[0031] 110 Oil inlet punch

[0032] 111 Long groove

[0033] 112 Long hole

[0034] 113 Oil inlet tank

[0035] 114 Oil inlet

[0036] 12 Parallel oil sections

[0037] 120 parallel oil circuit punching

[0038] 121 parallel oil hole

[0039] 13 End oil collection section

[0040] 130 Oil collecting punch

[0041] 131 Oil collecting hole

[0042] 131a Long annular hole

[0043] 131b Vertical hole

[0044] 14 End injection section

[0045] 140 Injection Punch

[0046] 141 Oil outlet DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0051] like Figures 1 to 9 The figure shows an embodiment of the oil-cooled drive motor cooling system provided by the utility model.

[0052] See also Figure 1 and Figure 2 The oil-cooled drive motor cooling system of the embodiment of the utility model includes a stator core 1 and a stator winding (not shown in the figure), the stator core 1 has a tooth slot 1a, the stator winding is wound on the tooth slot 1a of the stator core 1, and the stator winding has two end portions, and the two end portions of the stator winding are respectively located at the two end sides of the stator core 1.

[0053] The stator core 1 comprises an oil inlet section 11 in the middle, two parallel oil sections 12 respectively located at both ends of the oil inlet section 11, two end oil collecting sections 13 respectively located at one side of the two parallel oil sections 12 away from the oil inlet section 11, and two end oil spraying sections 14 respectively located at one side of the two end oil collecting sections 13 away from the parallel oil section 12. The oil inlet section 11 and the parallel oil section 12, the parallel oil section 12 and the end oil collecting section 13, and the end oil collecting sections 14 are connected to each other. The oil section 13 and the end oil injection section 14 are both fixedly connected along the axial direction of the stator core 1, and are connected in sequence in the order of an end oil injection section 14, an end oil collecting section 13, a parallel oil section 12, an oil inlet section 11, another parallel oil section 12, another end oil collecting section 13, and another end oil injection section 14 to form the overall structure of the stator core 1. The two ends of the stator winding are respectively located on the side of the two end oil injection sections 14 away from the end oil collecting section 13.

[0054] An oil inlet passage is provided on the oil inlet section 11, and the oil inlet passage on the oil inlet section 11 extends along the circumference of the oil inlet section 11. In one embodiment, the oil inlet passage is connected end to end along the circumference of the oil inlet section 11 to form a circle, and local oil inlet can be provided by providing an oil inlet passage connected to the oil inlet passage, so that the cooling oil can flow in series along the circumference of the oil inlet section 11 through the oil inlet passage. In another embodiment, the oil inlet passage is arranged in a circle along the circumference of the oil inlet section 11 and is divided into a plurality of oil inlet sections by a plurality of blocks in the middle, and oil can be provided throughout the circumference by providing an oil inlet passage corresponding to each oil inlet section, so that the cooling oil can flow through the circumference of the oil inlet section 11 through the oil inlet passage.

[0055] A plurality of parallel oil passages are provided at intervals along the circumferential direction on the parallel oil passage section 12. Preferably, the parallel oil passages extend along the axial direction of the parallel oil passage section 12 and penetrate the two ends of the parallel oil passage section 12. One end of each parallel oil passage close to the oil inlet passage section 11 is connected to the oil inlet passage on the oil inlet passage section 11. The cooling oil flowing into the oil inlet passage on the circumference of the oil inlet passage section 11 can simultaneously enter each parallel oil passage on the parallel oil passage section 12 at both ends of the oil inlet passage section 11, thereby flowing in parallel along the axial direction of the parallel oil passage section 12.

[0056] A plurality of oil collecting passages are provided at intervals along the circumferential direction on the end oil collecting section 13, and the oil collecting passages penetrate through both ends of the end oil collecting section 13 along the axial direction of the end oil collecting section 13. One oil collecting passage on the end oil collecting section 13 corresponds to and connects with a plurality of parallel oil passages on the parallel oil section 12, and the cooling oil flowing in parallel along the axial direction of the parallel oil section 12 in each parallel oil passage on the parallel oil section 12 can flow into the corresponding oil collecting passage, and the cooling oil in the plurality of parallel oil passages is collected by one oil collecting passage, thereby playing the role of oil collection.

[0057] A plurality of oil outlet passages are provided at circumferential intervals on the end oil injection section 14, and an oil collecting passage on the end oil collecting section 13 corresponds to and is connected to at least one oil outlet passage on the end oil injection section 14. The cooling oil collected in the oil collecting passage can be axially sprayed toward the corresponding stator winding end through the oil outlet passage on the end oil injection section 14.

[0058] In summary, the cooling oil circuit of the oil-cooled drive motor cooling system of the present embodiment is as follows: oil is introduced from the oil inlet section 11 in the middle of the stator core 1, the cooling oil realizes circumferential flow through the oil inlet channel on the oil inlet section 11, and at the same time enters the parallel oil channels on the parallel oil sections 12 on both ends of the oil inlet section 11, and realizes axial multi-branch parallel flow through each parallel oil channel on the parallel oil sections 12 on both sides, and then enters the oil collecting channels on the oil collecting sections 13 at the ends on both sides respectively, and is gathered, the cooling oil in two or more parallel oil channel branches can be gathered into an oil collecting channel on the end oil collecting section 13 to ensure uniformity of pressure distribution, and the cooling oil gathered in the oil collecting channel on the end oil collecting section 13 is directly sprayed axially to the root of the corresponding stator winding end through the oil outlet channels on the oil injection sections 14 at both ends. Thus, the oil-cooled drive motor cooling system of the present embodiment realizes that after the oil enters the cooling oil circuit, the oil flows along the circumference on the stator core 1 and flows in parallel along multiple branches in the axial direction, and then is collected in the oil collecting channel on the end oil collecting section 13, so that the stator core 1 can be fully cooled, and then the oil outlet channels on the end oil spraying sections 14 on both sides are directly sprayed axially to the roots of the two ends of the stator winding, so that the roots of the two ends of the stator winding can be evenly sprayed and cooled. The uniform spraying of the roots of the two ends of the stator winding can ensure the uniformity of the stator surface cooling without affecting the stator magnetic circuit too much, and can also realize the uniform spraying of the stator winding, while ensuring the full utilization of the cooling oil and reducing the loss of the oil pump. At the same time, the oil-cooled drive motor cooling system of the present embodiment directly sprays the roots of the two ends of the stator winding axially through the oil outlet channels on the end oil spraying sections 14 at both ends of the stator core 1, which is different from the conventional solution of adding oil spraying rings at both ends of the stator core for radial spraying in the prior art, and eliminates the need for oil immersion cooling and other components, and the structure is more compact.

[0059] In this embodiment, preferably, the oil inlet section 11 includes two oil inlet punching segments 11 b , and the two oil inlet punching segments 11 b are both formed by stacking a plurality of oil inlet punching sheets 110 in sequence along the axial direction.

[0060] See also Figure 1 and Figure 3The first embodiment of the oil inlet punch 110 is as follows: a plurality of long grooves 111 are arranged at intervals along the circumferential direction on the outer circumferential surface of the oil inlet punch 110, and adjacent long grooves 111 are separated by a boss, and each long groove 111 penetrates the two sides of the oil inlet punch 110 along the axial direction of the oil inlet punch 110. A plurality of oil inlet grooves 113 formed by sequentially connecting a plurality of long grooves 111 are formed on the oil inlet punch segment 11b formed by sequentially stacking a plurality of oil inlet punches 110 along the axial direction, and each oil inlet groove 113 penetrates the two ends of the oil inlet punch segment 11b along the axial direction of the oil inlet punch segment 11b. Two oil inlet punch segments 11b are connected to each other along the axial direction, so that the two opposite oil inlet grooves 113 on the two oil inlet punch segments 11b are connected, and the oil inlet passage on the oil inlet oil section 11 is composed of a plurality of pairs of oil inlet grooves 113 arranged along the circumferential direction. Each oil inlet groove 113 corresponds to and connects a plurality of parallel oil passages on the parallel oil section 12 to achieve flow distribution. The long groove 111 is preferably a long ring extending along the circumference of the oil inlet punch 110. The long groove 111 is a long ring groove formed by inward depression on the outer circumference of the oil inlet punch 110, so that the oil inlet groove 113 formed on the oil inlet punch segment 11b is a long ring oil inlet groove inwardly depressed on the outer circumference of the oil inlet punch segment 11b. When the stator core 1 and the motor housing are assembled, the oil inlet groove 113 forms an oil passage with openings at both ends together with the inner circumference of the motor housing. With the first embodiment of the oil inlet punch 110, the oil inlet punches 110 stacked axially in the oil inlet section 11 can be connected and fixed by gluing.

[0061] In a preferred embodiment, the two oil inlet punch segments 11b can be connected to each other axially, then the two opposite oil inlet grooves 113 on the two oil inlet punch segments 11b are connected to each other to form an oil inlet groove, and the two opposite bosses on the two oil inlet punch segments 11b are connected to each other to form a baffle, and the adjacent oil inlet grooves on the oil inlet section 11 are separated by the baffle, and one oil inlet groove forms an oil inlet section, and multiple oil inlet grooves distributed at intervals along the circumference of the oil inlet section 11 constitute the oil inlet channel of the oil inlet section 11. At this time, each oil inlet groove can be connected to an oil inlet channel to carry out full-circle oil supply.

[0062] In another preferred embodiment, Figure 1 As shown, the two oil inlet punch segments 11b can also be relatively rotated by an angle along the circumferential direction, so that the two opposite oil inlet grooves 113 on the two oil inlet punch segments 11b are staggered and connected, and each oil inlet groove 113 on one oil inlet punch segment 11b corresponds to and connects with each adjacent two oil inlet grooves 113 on the other oil inlet punch segment 11b in sequence, then all the oil inlet grooves 113 are serpentinely connected in series along the circumferential direction of the oil inlet oil section 11 to form an oil inlet oil channel, at this time, local oil inlet can be carried out through one or several oil inlet grooves 113 corresponding to the connected oil inlet channel.

[0063] See also Figure 2 and Figure 4The second embodiment of the oil inlet punch 110 is as follows: a plurality of long holes 112 are provided on the outer periphery of the oil inlet punch 110, and each of the long holes 112 penetrates through the two sides of the oil inlet punch 110 along the axial direction of the oil inlet punch 110. At least one of the long holes 112 is provided with an oil inlet port 114. The oil inlet punch segment 11b formed by sequentially stacking a plurality of oil inlet punches 110 along the axial direction is provided with a plurality of oil inlet channels formed by sequentially connecting a plurality of long holes 112 and at least one oil inlet port 11a formed by sequentially connecting a plurality of oil inlet ports 114, and each of the oil inlet channels penetrates through both ends of the oil inlet punch segment 11b along the axial direction of the oil inlet punch segment 11b. The two oil inlet punch segments 11b are connected axially and rotated relative to each other at an angle along the circumferential direction, so that the two opposite oil inlet channels on the two oil inlet punch segments 11b are staggered and connected, and each oil inlet channel on one oil inlet punch segment 11b corresponds to and connects with each adjacent two oil inlet channels on the other oil inlet punch segment 11b in turn, so that all the oil inlet channels are connected in series in a serpentine shape along the circumference of the oil inlet oil section 11 to form an oil inlet oil channel, and local oil inlet can be carried out through the oil inlet hole 11a corresponding to the oil inlet channel. Each long hole 112 corresponds to and connects multiple parallel oil channels on the parallel oil section 12 to achieve flow distribution. The long hole 112 is preferably a long ring extending along the circumference of the oil inlet punch 110, and the long hole 112 is a long ring through hole opened on the outer periphery of the oil inlet punch 110 near the outer cylindrical surface, so that the oil inlet channel formed on the oil inlet punch segment 11b is a long ring oil inlet channel opened near the outer cylindrical surface of the yoke of the oil inlet punch segment 11b. By adopting the second embodiment of the oil inlet punch 110 , the oil inlet punches 110 stacked axially on the oil inlet section 11 can be connected and fixed by welding.

[0064] In the two embodiments of the above-mentioned oil inlet punch 110, the number of long grooves 111 / long holes 112 is n (n is a positive integer), and the outer diameter of the oil inlet punch 110 is D. In order to facilitate the circumferential serial oil inlet, preferably, the dimension of the long grooves 111 / long holes 112 extending along the outer circle of the oil inlet punch 110 is d1=(3 / 4)*(πD / n), and the circumferential spacing dimension between adjacent long grooves 111 / long holes 112 along the outer circle of the oil inlet punch 110 is d2=(1 / 4)*(πD / n). The cross-sectional shape of the long grooves 111 / long holes 112 is not limited, and can be, for example, fan-shaped, rectangular, or elliptical.

[0065] See also Figure 5In this embodiment, preferably, the parallel oil section 12 is formed by stacking a plurality of parallel oil punching sheets 120 in sequence along the axial direction, and a plurality of parallel oil holes 121 are provided at intervals along the circumferential direction on the outer periphery of the parallel oil punching sheet 120, and each parallel oil hole 121 penetrates through both sides of the parallel oil punching sheet 120 in the axial direction of the parallel oil punching sheet 120. The parallel oil passages on the parallel oil section 12 formed by stacking a plurality of parallel oil punching sheets 120 in sequence along the axial direction are formed by connecting a plurality of parallel oil holes 121 in sequence, and the parallel oil passages extend in the axial direction of the parallel oil section 12 and penetrate through both ends of the parallel oil section 12. The dimension of a single parallel oil hole 121 extending in the circumferential direction of the parallel oil circuit punching plate 120 is smaller than the dimension of a single long groove 111 / long hole 112 extending in the circumferential direction of the oil inlet punching plate 110. A plurality of parallel oil holes 121 are respectively provided on the parallel oil circuit punching plate 120 at positions corresponding to the long groove 111 / long hole 112 on the oil inlet punching plate 110, so that an oil inlet groove 113 / oil inlet channel on the oil inlet punching segment 11b respectively corresponds to and connects a plurality of parallel oil channels on the parallel oil section 12. Preferably, the parallel oil hole 121 is a small hole opened on the outer periphery of the parallel oil circuit punching plate 120 near the outer cylindrical surface, so that the parallel oil channel on the parallel oil section 12 is a narrow parallel oil channel opened near the outer cylindrical surface of the yoke of the parallel oil section 12. The cross-sectional shape of the parallel oil hole 121 is not limited, and may be, for example, rectangular, square or circular.

[0066] See also Figure 6 and Figure 7 In this embodiment, preferably, the end oil collecting section 13 is formed by stacking a plurality of oil collecting punches 130 in sequence along the axial direction, and a plurality of oil collecting holes 131 are provided on the outer peripheral edge of the oil collecting punches 130 at intervals along the circumferential direction, and each oil collecting hole 131 penetrates through both sides of the oil collecting punches 130 in the axial direction of the oil collecting punches 130. The oil collecting channel on the end oil collecting section 13 formed by stacking a plurality of oil collecting punches 130 in sequence along the axial direction is formed by connecting a plurality of oil collecting holes 131 in sequence, and the oil collecting channel penetrates through both ends of the end oil collecting section 13 in the axial direction of the end oil collecting section 13. The dimension of a single oil collecting hole 131 extending circumferentially along the oil collecting punch 130 is greater than the dimension of a single parallel oil hole 121 extending circumferentially along the parallel oil circuit punch 120. The parallel oil circuit punch 120 has multiple parallel oil holes 121 at positions corresponding to the oil collecting holes 131 on the oil collecting punch 130, so that one oil collecting oil channel on the end oil collecting section 13 corresponds to and connects multiple parallel oil channels on the parallel oil section 12.

[0067] Preferably, the oil collecting hole 131 includes an elongated annular hole portion 131a and a vertical hole portion 131b which are interconnected in a T shape, the elongated annular hole portion 131a extending along the circumference of the oil collecting punch 130, and the vertical hole portion 131b extending from the middle of the elongated annular hole portion 131a toward the center of the oil collecting punch 130 to a position corresponding to the oil outlet channel on the end injection section 14. The oil collecting channel on the end oil collecting section 13 includes a long annular oil channel formed by the long annular hole portions 131a of multiple oil collecting holes 131 connected in sequence and a vertical oil channel formed by the vertical hole portions 131b of multiple oil collecting holes 131 connected in sequence. The multiple parallel oil channels on the parallel oil section 12 lead to the long annular oil channel of the oil collecting channel on the end oil collecting section 13. The long annular oil channel formed by the long annular hole portions 131a collects the cooling oil of the multiple parallel oil channels and merges into the vertical oil channel formed by the vertical hole portions 131b. The cooling oil gathered in the vertical oil channel is sprayed out through the oil outlet channel on the end oil injection section 14. The long annular hole portion 131a of the oil collecting hole 131 is preferably a long annular hole portion extending along the circumference of the oil collecting punch 130 and opened near the outer cylindrical surface on the outer periphery of the oil collecting punch 130, and the vertical hole portion 131b of the oil collecting hole 131 is a long straight hole portion extending from the inner middle of the long annular hole portion 131a to the center straight line of the oil collecting punch 130, so that the long annular oil passage of the oil collecting passage formed on the end oil collecting section 13 is a long annular oil passage opened near the outer cylindrical surface of the yoke of the end oil collecting section 13, and the vertical oil passage of the oil collecting passage is a long straight vertical oil passage extending from the inner middle of the long annular oil passage to the center straight line of the end oil collecting section 13. The cross-sectional shape of the long annular hole portion 131a is not limited, for example, it can be fan-shaped, rectangular or elliptical. The vertical hole portion 131b is also not limited, and is preferably rectangular.

[0068] See also Figures 8 to 9 In this embodiment, preferably, the end injection section 14 is formed by a plurality of injection punches 140 stacked in sequence along the axial direction, and a plurality of oil outlet holes 141 are arranged at intervals along the circumferential direction on the outer peripheral edge of the injection punch 140, and each oil outlet hole 141 penetrates the two side surfaces of the injection punch 140 along the axial direction of the injection punch 140. The oil outlet passage on the end injection section 14 formed by a plurality of injection punches 140 stacked in sequence along the axial direction is formed by a plurality of oil outlet holes 141 connected in sequence, and the oil outlet passage penetrates the two ends of the end injection section 14 along the axial direction of the end injection section 14. Preferably, one oil outlet hole 141 on the injection punch 140 corresponds to and communicates with one oil collecting hole 131 on the oil collecting punch 130, and the oil outlet hole 141 is preferably opposite to and communicates with one end of the vertical hole portion 131b of the oil collecting hole 131 away from the long annular hole portion 131a. The cross-sectional shape of the oil outlet hole 141 is not limited, and may be, for example, rectangular, square, or circular.

[0069] like Figure 8As shown, the first embodiment of the oil injection punch 140 is that a plurality of oil outlet holes 141 arranged circumferentially on the outer periphery of the oil injection punch 140 are located on different circumferential lines to form a radially non-uniform distribution. Figure 6 As shown, a first embodiment of the oil collecting punch 130 is as follows: the extending endpoints of the vertical hole portion 131b of the oil collecting hole 131 corresponding to each oil outlet hole 141 and away from one end of the long annular hole portion 131a are located on different circumferential lines, and the extending length of the vertical hole portion 131b of each oil collecting hole 131 is different according to the different circumferences of the corresponding oil outlet hole 141.

[0070] like Fig. 9 As shown in FIG. 1 , a second embodiment of the oil injection punch 140 is as follows: a plurality of oil outlet holes 141 arranged circumferentially at intervals on the outer periphery of the oil injection punch 140 are located on the same circumferential line. Figure 7 As shown, a second embodiment of the oil collecting punch 130 is as follows: the extending end points of the vertical hole portions 131b of the oil collecting holes 131 corresponding to and connected to the oil outlet holes 141 and away from one end of the long annular hole portion 131a are located on the same circumferential line, and the extending lengths of the vertical hole portions 131b of the oil collecting holes 131 are the same.

[0071] Optimally, in this embodiment, the stator core 1 as a whole is an eight-segment structure formed by stacking four types of punches: the oil inlet punch 110, the parallel oil circuit punch 120, the oil collecting punch 130 and the oil injection punch 140, specifically: two oil inlet punch segments 11b formed by axially stacking the oil inlet punch 110, two parallel oil circuit segments 12 formed by axially stacking the parallel oil circuit punch 120, and two end oil collecting segments 13 formed by axially stacking the oil collecting punch 130. 13 and two end injection sections 14 formed by the injection punching sheets 140 stacked in the axial direction, are connected in sequence in the axial direction in the order of one end injection section 14, one end oil collection section 13, one parallel oil section 12, two oil inlet punching sections 11b (oil inlet oil section 11), another parallel oil section 12, another end oil collection section 13, and another end injection section 14, wherein the two oil inlet punching sections 11b can be assembled after being relatively rotated by an angle in the circumferential direction. Preferably, all the punching sheets can be fixed into an integral stator core 1 structure by welding after being stacked.

[0072] In this embodiment, the length distribution of each punching segment (the oil inlet punching segment 11b, the parallel oil section 12, the end oil collecting segment 13 and the end oil injection segment 14) in the axial direction is not limited and can be flexibly adjusted and distributed according to the actual flow resistance and heat dissipation requirements. Since each punching segment is formed by stacking corresponding punching sheets, the length distribution of each punching segment can be adjusted very conveniently and flexibly, so as to be well adapted to various usage requirements.

[0073] In this embodiment, the number and distribution of holes / slots on each punch (oil inlet punch 110, parallel oil circuit punch 120, oil collecting punch 130 and oil injection punch 140) are not limited and can be adjusted according to the stator size, cooling oil volume and spray effect requirements.

[0074] 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. An oil-cooled drive motor cooling system, characterized in that: The invention comprises a stator core (1) having tooth slots (1a) and a stator winding wound on the tooth slots (1a), wherein the two ends of the stator winding are respectively located at the two end sides of the stator core (1), and the stator core (1) comprises an oil inlet section (11) located in the middle, two parallel oil sections (12) respectively located at the two end sides of the oil inlet section (11), two end oil collecting sections (13) respectively located at one side of the two parallel oil sections (12) away from the oil inlet section (11), and two end oil collecting sections (13) respectively located at one side of the two end oil collecting sections (13) away from the parallel oil sections. Two end injection sections (14) are provided on one side of the oil connection section (12); the oil connection section (11) is provided with an oil inlet passage extending in the circumferential direction; the parallel oil section (12) is provided with a plurality of parallel oil passages at intervals in the circumferential direction, each of the parallel oil passages is connected to the oil inlet passage; the end oil collection section (13) is provided with a plurality of oil collection passages at intervals in the circumferential direction, one of the oil collection passages corresponds to and is connected to a plurality of the parallel oil passages; the end injection section (14) is provided with a plurality of oil outlet passages at intervals in the circumferential direction, one of the oil collection passages corresponds to and is connected to at least one of the oil outlet passages.

2. The oil-cooled drive motor cooling system according to claim 1, characterized in that: The oil inlet section (11) comprises two oil inlet punch segments (11b) formed by axially stacking a plurality of oil inlet punches (110), a plurality of long grooves (111) are arranged at intervals along the circumferential direction on the outer circumferential surface of the oil inlet punch (110), an oil inlet groove (113) formed by sequentially connecting a plurality of the long grooves (111), the two oil inlet punch segments (11b) are axially connected to each other so that the two opposite oil inlet grooves (113) on the two oil inlet punch segments (11b) are connected, and the oil inlet passage on the oil inlet section (11) is formed by a plurality of pairs of the oil inlet grooves (113) arranged along the circumferential direction.

3. The oil-cooled drive motor cooling system according to claim 2, characterized in that: The two oil inlet punch segments (11b) are relatively rotated at an angle along the circumferential direction, so that the two opposite oil inlet grooves (113) on the two oil inlet punch segments (11b) are staggered and connected, and each oil inlet groove (113) on one oil inlet punch segment (11b) corresponds to and connects with each adjacent two oil inlet grooves (113) on the other oil inlet punch segment (11b) in sequence, and all the oil inlet grooves (113) are connected in series in a serpentine shape along the circumferential direction of the oil inlet oil section (11) to form the oil inlet oil passage.

4. The oil-cooled drive motor cooling system according to claim 1, characterized in that: The oil inlet section (11) comprises two oil inlet punching segments (11b) formed by axially stacking a plurality of oil inlet punching sheets (110), a plurality of long holes (112) are arranged at intervals along the circumferential direction on the outer circumference of the oil inlet punching sheets (110), at least one of the long holes (112) is provided with an oil inlet port (114), and an oil inlet channel formed by the plurality of long holes (112) connected in sequence and a plurality of oil inlet ports (114) connected in sequence are formed on the oil inlet punching segment (11b). The two oil inlet 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 channels on the two oil inlet punch segments (11b) are staggered and connected, and each oil inlet channel on one oil inlet punch segment (11b) corresponds to and connects with each adjacent two oil inlet channels on the other oil inlet punch segment (11b) in sequence, and all the oil inlet channels are connected in series in a serpentine shape along the circumferential direction of the oil inlet oil section (11) to form the oil inlet channel.

5. The oil-cooled drive motor cooling system according to claim 1, characterized in that: The parallel oil section (12) is formed by a plurality of parallel oil punching sheets (120) being stacked in sequence along the axial direction, a plurality of parallel oil holes (121) are provided on the outer peripheral edge of the parallel oil punching sheet (120) at intervals in the circumferential direction, and the parallel oil passage on the parallel oil section (12) is formed by a plurality of parallel oil holes (121) being connected in sequence.

6. The oil-cooled drive motor cooling system according to claim 1, characterized in that: The end oil collecting section (13) is formed by a plurality of oil collecting punching sheets (130) being stacked in sequence along the axial direction, a plurality of oil collecting holes (131) are provided at intervals along the circumferential direction on the outer peripheral edge of the oil collecting punching sheet (130), and the oil collecting channel on the end oil collecting section (13) is formed by a plurality of the oil collecting holes (131) being connected in sequence.

7. The oil-cooled drive motor cooling system according to claim 6, characterized in that: The oil collecting hole (131) comprises a long annular hole portion (131a) and a vertical hole portion (131b) which are interconnected in a T shape, wherein the long annular hole portion (131a) extends along the circumference of the oil collecting punch (130), and the vertical hole portion (131b) extends from the middle of the long annular hole portion (131a) toward the center of the oil collecting punch (130) to a position corresponding to the oil outlet passage on the end injection section (14) and connected thereto.

8. The oil-cooled drive motor cooling system according to claim 1, characterized in that: The end oil injection section (14) is formed by a plurality of oil injection punching sheets (140) being stacked in sequence along the axial direction, a plurality of oil outlet holes (141) are provided on the outer peripheral edge of the oil injection punching sheet (140) at intervals in the circumferential direction, and the oil outlet passage on the end oil injection section (14) is formed by a plurality of the oil outlet holes (141) being connected in sequence.

9. The oil-cooled drive motor cooling system according to claim 8, characterized in that: The plurality of oil outlet holes (141) arranged at intervals along the circumferential direction on the outer circumference of the oil injection punch (140) are located on the same circumferential line or on different circumferential lines.

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