Motor housing

Abstract

The present application relates to a motor casing. The casing includes a cylindrical base, an inner sleeve and an outer sleeve. The cylindrical base forms a first space. The first space is used to accommodate stator windings. The cylindrical base is provided with oil pouring holes and oil collecting holes at intervals. The inner sleeve is sleeved on the outer side of the cylindrical base. A cooling water cavity is formed between the inner wall of the inner sleeve and the outer wall of the cylindrical base. A plurality of axial ribs are arranged on the outer surface of the inner sleeve. A cooling oil flow channel is formed between two adjacent axial ribs. The cooling oil flow channel facilitates the circumferential distribution of cooling oil and improves the heat exchange efficiency. The outer sleeve is sleeved on the outside of the inner sleeve. An oil pouring cavity and an oil collecting cavity are formed between the outer sleeve and the inner sleeve. The oil pouring cavity is used to communicate with the oil outlet and the oil pouring hole of the cooling oil pump. The oil collecting cavity is used to communicate with the oil inlet and the oil collecting hole of the cooling oil pump. The motor casing realizes rapid cooling of the stator winding by combining water cooling and oil cooling, thereby improving the service life of the motor.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a motor housing. Background Art

[0002] Generally, the vehicle cooling system uses a water pump as the power source and adopts water cooling. The main heat source of the vehicle motor is the stator winding. When the existing vehicle motor uses cooling water to cool down, the cooling water usually passes through the stator yoke and the motor housing, and then transfers the cooling water to the water jacket in the housing for cooling.

[0003] The cooling water path of automotive motors is long, the cold dissipation is serious, and the stator winding temperature cannot be effectively reduced in time, which reduces the power and life of the motor. Summary of the invention

[0004] Based on this, it is necessary to provide a motor housing to solve the problem of how to effectively reduce the temperature of the stator winding.

[0005] A motor casing includes a cylindrical base, an inner sleeve and an outer sleeve. The cylindrical base is formed to form a first space. The first space is used to accommodate stator windings. The cylindrical base is provided with oil pouring holes and oil collecting holes at intervals. The inner sleeve is sleeved on the outer side of the cylindrical base. A cooling water cavity is formed between the inner wall of the inner sleeve and the outer wall of the cylindrical base. The cooling water cavity is used to communicate with a cooling water pump. The inner sleeve includes an inner sleeve outer surface. A plurality of axial ribs are provided on the outer surface of the inner sleeve. A cooling oil flow channel is formed between two adjacent axial ribs.

[0006] The outer sleeve is sleeved on a side of the inner sleeve away from the cylindrical base. An oil pouring cavity and an oil collecting cavity are formed between the inner wall of the outer sleeve and the outer surface of the inner sleeve. The oil pouring cavity and the oil collecting cavity respectively receive a plurality of cooling oil flow channels. The oil pouring cavity is used to communicate with the oil outlet of the cooling oil pump and the oil pouring hole. The oil collecting cavity is used to communicate with the oil inlet of the cooling oil pump and the oil collecting hole.

[0007] In one embodiment, a first axial rib group and a second axial rib group are axially spaced apart on the outer surface of the inner sleeve. The first axial rib group and the second axial rib group respectively include a plurality of axial ribs. The plurality of axial ribs of the first axial rib group are arranged in an array. The plurality of axial ribs of the second axial rib group are arranged in an array.

[0008] In one embodiment, the cylindrical base includes a first cylindrical base end face and a cylindrical base outer surface connected to the first cylindrical base end face. The cylindrical base outer surface is provided with an annular groove. A plurality of first ribs are arranged at the bottom of the annular groove. A cooling water flow channel is formed between two adjacent first ribs. The cooling water flow channel is used to communicate with the cooling water pump.

[0009] In one embodiment, the first rib is an annular rib structure, and each annular rib structure has an opening.

[0010] In one embodiment, the first rib is a spiral annular rib structure.

[0011] In one embodiment, the end surface of the first cylindrical base is provided with a cooling water inlet, a cooling water outlet, a cooling oil inlet and a cooling oil outlet at intervals. The cooling water inlet is used to communicate with the water outlet of the cooling water pump and the cooling water flow channel. The cooling water outlet is used to communicate with the water inlet of the cooling water pump and the cooling water flow channel. The cooling oil inlet is used to communicate with the oil pouring cavity and the oil outlet of the cooling oil pump. The cooling oil outlet is used to communicate with the oil collecting cavity and the oil inlet of the cooling oil pump.

[0012] In one embodiment, the outer surface of the inner sleeve is provided with a first partition and a second partition at intervals in an annular direction. The surfaces of the first partition and the second partition away from the outer surface of the inner sleeve are used to fit with the inner wall of the outer sleeve to form the oil pouring cavity and the oil collecting cavity.

[0013] In one embodiment, the outer sleeve includes an inner surface of the outer sleeve. Positioning grooves are respectively provided on two side walls of the annular groove. The outer sleeve is clamped in the positioning groove. Two first bosses are arranged at intervals on the side walls of the positioning groove. The first partition and the second partition are arranged in one-to-one correspondence with the two first bosses respectively. The inner sleeve is arranged between two opposite first bosses. The surface of the first boss away from the bottom of the annular groove is used to fit with the inner surface of the outer sleeve. An oil sprinkling groove and an oil collecting groove are formed between the side walls of the annular groove, the end face of the inner sleeve and the inner surface of the outer sleeve. The oil sprinkling hole is provided at the bottom of the oil sprinkling groove. The oil collecting hole is provided at the bottom of the oil collecting groove. The cooling oil flow channel arranged opposite to the oil sprinkling groove is connected to the oil sprinkling groove. The cooling oil flow channel arranged opposite to the oil collecting groove is connected to the oil collecting groove.

[0014] In one embodiment, the circumferential distribution angles of the oil pouring chamber and the oil collecting chamber are equal.

[0015] In one embodiment, there are a plurality of the oil pouring holes, the plurality of the oil pouring holes are distributed circumferentially, and the circumferential distribution angle of the plurality of the oil pouring holes is less than 180°.

[0016] In one embodiment, the plurality of oil pouring holes are arranged close to two end surfaces of the cylindrical base.

[0017] The motor housing includes a cylindrical base, an inner sleeve and an outer sleeve. The cylindrical base is enough to form a first space. The first space is used to accommodate the stator winding. The cylindrical base is provided with oil pouring holes and oil collecting holes at intervals. The inner sleeve is sleeved on the outer side of the cylindrical base. A cooling water cavity is formed between the inner wall of the inner sleeve and the outer wall of the cylindrical base. The cooling water cavity is used to communicate with a cooling water pump. The inner sleeve includes an inner sleeve outer surface. A plurality of axial ribs are arranged on the outer surface of the inner sleeve. The outer sleeve is sleeved on the side of the inner sleeve away from the cylindrical base. An oil pouring cavity and an oil collecting cavity are formed between the inner wall of the outer sleeve and the outer surface of the inner sleeve. The oil pouring cavity and the oil collecting cavity respectively contain a plurality of cooling oil flow channels. The oil pouring cavity is used to communicate with the oil outlet of the cooling oil pump and the oil pouring hole. The oil collecting cavity is used to communicate with the oil inlet of the cooling oil pump and the oil collecting hole.

[0018] The motor housing constructs a dual cooling cycle of cooling oil circulation and cooling water circulation through the cylindrical base, the inner sleeve and the outer sleeve. The heat of the stator winding of the cooling oil circulation is transferred to the cooling oil. A plurality of axial ribs are arranged on the outer surface of the inner sleeve. A cooling oil flow channel is formed between two adjacent axial ribs. The cooling oil flow channel facilitates the circumferential distribution of the cooling oil and improves the heat exchange efficiency. The large-area heat exchange between the cooling oil and the cooling water allows the heat of the cooling oil to be taken away by the cooling water. The cooling water chamber is closer to the stator than the oil pouring chamber and the oil collecting chamber. The cooling water is also used to absorb the heat from the stator core, further shortening the heat transfer path. The motor housing improves the cooling capacity of the motor through the water-oil dual cooling cycle in the motor housing, and reduces the stator winding temperature and the core temperature of the motor when the motor is running at rated power and peak power. Furthermore, the motor housing reduces the temperature of the rotor permanent magnet, prevents the permanent magnet from high-temperature demagnetization, and improves the service life and power of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the motor housing provided in one embodiment of the present application;

[0020] Figure 2 A schematic cross-sectional view of the AA section of the motor housing provided in one embodiment of the present application;

[0021] Figure 3 This is a schematic structural diagram of the cylindrical base provided in one embodiment of the present application;

[0022] Figure 4 This is a schematic structural diagram of the inner sleeve provided in one embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the structure of the outer sleeve provided in one embodiment of the present application;

[0024] Figure 6 A distribution diagram of oil pouring holes and oil collecting holes provided in one embodiment of the present application;

[0025] Figure 7 A side view of the cylindrical base provided in one embodiment of the present application after the inner sleeve is installed;

[0026] Figure 8 This is a two-dimensional view of the cylindrical base provided in one embodiment of the present application after the inner sleeve is installed;

[0027] Fig. 9 A cross-sectional view of the cooling water inlet and the cooling water outlet provided in one embodiment of the present application;

[0028] Fig.10 An enlarged view of a portion B of the cooling water inlet and the cooling oil outlet provided in one embodiment of the present application;

[0029] Fig.11 A cross-sectional view of the cooling oil inlet provided in one embodiment of the present application;

[0030] Fig.12 This is an enlarged view of the C part of the cooling oil inlet provided in one embodiment of the present application.

[0031] Figure Number:

[0032] Motor housing 10

[0033] Cooling water inlet 101

[0034] Cooling water outlet 102

[0035] Cooling oil inlet 103

[0036] Cooling oil outlet 104

[0037] The first axial rib group 110

[0038] Second axial rib group 120

[0039] Cylindrical base 20

[0040] First Space 201

[0041] Oil dripping hole 202

[0042] Oil collecting hole 203

[0043] Opening 204

[0044] The first cylindrical base end surface 210

[0045] The outer surface of the cylindrical base 220

[0046] Annular groove 230

[0047] First rib 240

[0048] Cooling water channel 250

[0049] Positioning slot 260

[0050] First boss 270

[0051] Oil tank 280

[0052] Oil collecting tank 290

[0053] Inner sleeve 30

[0054] End face 300

[0055] Cooling water chamber 301

[0056] Inner sleeve outer surface 310

[0057] The first partition 311

[0058] Second partition table 312

[0059] Axial rib 320

[0060] Oil distribution port 321

[0061] Cooling oil channel 330

[0062] Outer sleeve 40

[0063] Oil pouring chamber 401

[0064] Oil collecting chamber 402

[0065] Outer sleeve inner surface 410 DETAILED DESCRIPTION

[0066] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0067] The serial numbers for the components herein, such as "first", "second", etc., are only used to classify the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application 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 cannot be understood as a limitation to this application.

[0068] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The embodiment of the present application provides a motor housing 10 including a cylindrical base 20, an inner sleeve 30 and an outer sleeve 40. The cylindrical base 20 is enough to form a first space 201. The first space 201 is used to accommodate stator windings. The cylindrical base 20 is provided with oil pouring holes 202 and oil collecting holes 203 at intervals. The inner sleeve 30 is sleeved on the outside of the cylindrical base 20. A cooling water chamber 301 is formed between the inner wall of the inner sleeve 30 and the outer wall of the cylindrical base 20. The cooling water chamber 301 is used to communicate with a cooling water pump. The inner sleeve 30 includes an inner sleeve outer surface 310. The inner sleeve outer surface 310 is provided with a plurality of axial ribs 320. A cooling oil flow channel 330 is formed between two adjacent axial ribs 320.

[0070] The outer sleeve 40 is sleeved on the side of the inner sleeve 30 away from the cylindrical base 20. An oil pouring cavity 401 and an oil collecting cavity 402 are formed between the inner wall of the outer sleeve 40 and the outer surface 310 of the inner sleeve. The oil pouring cavity 401 and the oil collecting cavity 402 respectively receive a plurality of cooling oil flow channels 330. The oil pouring cavity 401 is used to communicate with the oil outlet of the cooling oil pump and the oil pouring hole 202. The oil collecting cavity 402 is used to communicate with the oil inlet of the cooling oil pump and the oil collecting hole 203.

[0071] The motor housing 10 is used to be sleeved outside the stator, and the stator is sleeved outside the rotor. The stator includes a stator winding and a stator core. The stator core includes a stator core yoke and a stator core tooth. The stator core tooth and the stator winding are spaced apart and are located in a ring structure with the same diameter. The stator core yoke is sleeved outside the stator core tooth and the stator winding.

[0072] A cooling water chamber 301 is formed between the inner wall of the inner sleeve 30 and the outer wall of the base 20 in the motor housing 10 provided in the embodiment of the present application. The cooling water chamber 301 is used to cool the stator. The cylindrical base 20 is enough to form a first space 201. The first space 201 is used to accommodate the stator winding. The cooling water chamber 301 is close to the stator core yoke and dissipates heat for the stator core yoke through heat transfer.

[0073] In addition, an oil pouring chamber 401 and an oil collecting chamber 402 are formed between the outer sleeve 40 and the inner sleeve 30. The oil pouring chamber 401 is used to communicate with the oil outlet of the cooling oil pump and the oil pouring hole 202. The oil collecting chamber 402 is used to communicate with the oil inlet of the cooling oil pump and the oil collecting hole 203. The oil pouring hole 202 is used to guide the cooling oil to drip onto the stator end winding, and the oil collecting hole 203 is used to collect the cooling oil. The oil pouring hole 202 and the oil collecting hole 203 realize oil cooling of the stator end winding, further improving the temperature reduction rate of the stator winding.

[0074] The motor housing 10 constructs a dual cooling cycle of cooling oil circulation and cooling water circulation through the cylindrical base 20, the inner sleeve 30 and the outer sleeve 40. A plurality of axial ribs 320 are provided on the outer surface 310 of the inner sleeve. A cooling oil flow channel 330 is formed between two adjacent axial ribs 320. The cooling oil flow channel 330 facilitates the circumferential distribution of the cooling oil and improves the heat exchange efficiency. The cooling oil circulation realizes faster transfer of the heat of the stator winding to the cooling oil. The large-area heat exchange between the cooling oil and the cooling water transfers the heat of the cooling oil to the cooling water.

[0075] The cooling water chamber 301 is closer to the stator than the oil pouring chamber 401 and the oil collecting chamber 402. The cooling water is also used to absorb the heat from the stator core yoke, shortening the heat transfer path. The motor housing 10 improves the cooling capacity of the motor through the water-oil dual cooling cycle in the motor housing, and reduces the stator winding temperature and core temperature of the motor when the motor is running at rated power and peak power. Furthermore, the motor housing 10 can also reduce the temperature of the rotor permanent magnet, prevent the permanent magnet from high-temperature demagnetization, and improve the service life and power of the motor.

[0076] The motor housing 10 is provided with the cooling water chamber 301 , the oil pouring chamber 401 and the oil collecting chamber 402 through a double-layer sleeve structure to form an oil-water heat exchanger, which can fully utilize the housing space and has high integration and high compactness characteristics.

[0077] Generally, the vehicle-mounted cooling system uses a water pump as the power source and adopts a water cooling method. The cooling water chamber 301 of the motor housing 10 is arranged around the stator winding. The cooling water chamber 301 is the main cooling source, and the water pump of the vehicle-mounted system is fully utilized to achieve the cooling of the motor.

[0078] In the previous embodiment, the working mechanism of the motor housing 10 is:

[0079] Low-temperature water is pumped into the cooling water chamber 301 by a water pump. The cooling water chamber 301 cools the stator core yoke in the first space 201 by heat transfer, and cools the oil in the oil pouring chamber 401 and the oil collecting chamber 402. The oil in the oil pouring chamber 401 drips onto the stator end winding through the oil pouring hole 202 to cool the stator end winding. The oil in the first space 201 flows from the oil collecting hole 203 to the oil collecting chamber 402. The cooling oil that absorbs heat fills the oil collecting chamber 402 through the cooling oil flow channel 330. The cooling oil flow channel 330 facilitates the circumferential distribution of the cooling oil, thereby improving the heat exchange efficiency.

[0080] The cooling oil pump is used to provide circulation power for the cooling oil.

[0081] Please also see Figure 6 In one embodiment, the oil pouring hole 202 and the oil collecting hole 203 are through holes opened along the radial direction of the cylindrical base 20. The oil pouring hole 202 and the oil collecting hole 203 are arranged close to the end surface of the cylindrical base 20. The cooling oil flows through the oil pouring hole 202 to cool the stator winding end. The cooling oil at the stator winding end also plays a role in lubricating and cooling the motor output shaft bearing.

[0082] In one embodiment, the circumferential distribution angles of the oil pouring chamber 401 and the oil collecting chamber 402 are equal.

[0083] In one embodiment, there are a plurality of the oil pouring holes 202 , and the plurality of the oil pouring holes 202 are distributed circumferentially, and the circumferential distribution angle of the plurality of the oil pouring holes 202 is less than 180°.

[0084] In one embodiment, the plurality of oil pouring holes 202 are disposed near two end surfaces of the tubular base 20 .

[0085] In one embodiment, the diameter of the oil pouring hole 202 is smaller than the diameter of the oil collecting hole 203, so that negative pressure is formed near the oil collecting hole 203. The absolute pressure of the oil collecting hole 203 is smaller than the absolute pressure of air. The air inside the first space 201 will push the oil at the bottom of the motor into the oil collecting hole 203, and then into the oil collecting cavity 401, and enter the cooling oil circulation.

[0086] Please also see Figure 4 and Figure 7 In one embodiment, the inner sleeve outer surface 310 is axially spaced apart from a first axial rib group 110 and a second axial rib group 120. The first axial rib group 110 and the second axial rib group 120 respectively include a plurality of axial ribs 320. The plurality of axial ribs 320 of the first axial rib group 110 are arranged in an array. The plurality of axial ribs 320 of the second axial rib group 120 are arranged in an array.

[0087] The gap between the first axial rib plate group 110 and the second axial rib plate group 120 forms a main flow channel. The cooling oil is distributed to the plurality of cooling oil flow channels 330 through the main flow channel. The first axial rib plate group 110 and the second axial rib plate group 120 can not only play a drainage effect, but also play a radial support role to improve the mechanical strength of the flow channel.

[0088] Please also see Figure 3 and Figure 8 In one embodiment, the cylindrical base 20 includes a first cylindrical base end face 210 and a cylindrical base outer surface 220 connected to the first cylindrical base end face 210. The cylindrical base outer surface 220 is provided with an annular groove 230. A plurality of first ribs 240 are arranged at the bottom of the annular groove 230. A cooling water flow channel 250 is formed between two adjacent first ribs 240. The cooling water flow channel 250 is used to communicate with the cooling water pump. The first ribs 240 can not only play a drainage effect, but also play a radial support role to improve the mechanical strength of the flow channel.

[0089] In one embodiment, the first rib plate 240 is an annular rib plate structure. Each annular rib plate structure has an opening 204 to allow cooling water to fill the cooling water chamber 301 .

[0090] In one embodiment, the first rib 240 is a spiral annular rib structure, which facilitates the diversion and drainage of cooling water and improves heat exchange efficiency.

[0091] In one embodiment, the first cylindrical base end surface 210 is provided with a cooling water inlet 101, a cooling water outlet 102, a cooling oil inlet 103 and a cooling oil outlet 104 at intervals. The cooling water inlet 101 is used to communicate with the water outlet of the cooling water pump and the cooling water flow channel 250. The cooling water outlet 102 is used to communicate with the water inlet of the cooling water pump and the cooling water flow channel 250. The cooling oil inlet 103 is used to communicate with the oil pouring cavity 401 and the oil outlet of the cooling oil pump. The cooling oil outlet 104 is used to communicate with the oil collecting cavity 402 and the oil inlet of the cooling oil pump.

[0092] In one embodiment, the cooling water inlet 101, the cooling water outlet 102, the cooling oil inlet 103 and the cooling oil outlet 104 are all one.

[0093] The number of the cooling water inlet 101 , the cooling water outlet 102 , the cooling oil inlet 103 and the cooling oil outlet 104 may be set separately according to the use requirements.

[0094] In one embodiment, the inner sleeve outer surface 310 is provided with a first partition 311 and a second partition 312 at intervals in an annular direction. The surfaces of the first partition 311 and the second partition 312 away from the inner sleeve outer surface 310 are used to fit with the inner wall of the outer sleeve 40 to form the oil pouring cavity 401 and the oil collecting cavity 402.

[0095] Please also see Fig. 9 , Fig.10 , Fig.11 and Fig.12 In one embodiment, the outer sleeve 40 includes an outer sleeve inner surface 410. Two side walls of the annular groove 230 are respectively provided with positioning grooves 260. The outer sleeve 40 is clamped in the positioning groove 260. Two first bosses 270 are arranged at intervals on the side walls of the positioning groove 260. The first partition 311 and the second partition 312 are respectively arranged in one-to-one correspondence with the two first bosses 270. The inner sleeve 30 is arranged between the two opposite first bosses 270.

[0096] The surface of the first boss 270 away from the bottom of the annular groove 230 is used to fit with the inner surface 410 of the outer sleeve. The side wall of the annular groove 230, the end surface of the inner sleeve 30 and the inner surface 410 of the outer sleeve form an oil pouring groove 280 and an oil collecting groove 290 spaced apart. The oil pouring hole 202 is provided at the bottom of the oil pouring groove 280. The oil collecting hole 203 is provided at the bottom of the oil collecting groove 290. The cooling oil flow channel 330 arranged opposite to the oil pouring groove 280 is communicated with the oil pouring groove 280. The cooling oil flow channel 330 arranged opposite to the oil collecting groove 290 is communicated with the oil collecting groove 290.

[0097] The external circulation of cooling water is driven by the external water pump of the motor. The external water pump drives the cooling water to flow from the cooling water inlet 103 on the cylindrical base 20 into the cooling water cavity 301. Due to the action of the first rib 240, the cooling water will flow along the axial and circumferential flow channels and fill the cooling water cavity 301 in the casing. The cooling water and the cooling oil perform heat exchange over a large area, and then the cooling water flows out from the cooling water outlet 102 to complete the external circulation of cooling water. The cooling water also absorbs the heat from the stator core yoke, further improving the heat dissipation capacity of the motor.

[0098] The cooling oil external circulation is driven by the motor external oil pump, driving the cooling oil from the cooling oil inlet 103 into the oil pouring chamber 401. Then the cooling oil enters the oil pouring groove 280 along the cooling oil flow channel 330 corresponding to the oil pouring groove 280. The cooling oil pours out from the oil pouring groove 280 to the motor winding end. Under the action of gravity, the cooling oil flows to the lower part of the first space 201, enters the oil collecting chamber 402 through the oil collecting hole 203, and finally flows to the cooling oil outlet 104, completing the cooling oil internal circulation.

[0099] The shapes of the radial ribs 320 and the first ribs 240 in the present invention are not limited.

[0100] In order to ensure the mechanical strength and sealing of the motor housing 10. During processing, the two semicircular inner sleeves 30 and the two semicircular outer sleeves 40 are processed separately. The assembly process is mainly divided into two steps. The first step is to weld the inner sleeve 30. The two semicircular inner sleeves 30 are sleeved on the cylindrical base 20. The end faces of the two semicircular inner sleeves 30 are annularly welded to the side wall edges of the annular groove 230. The two semicircular inner sleeves 30 are butt welded. The second step is to weld the outer sleeve 40, and the two semicircular outer sleeves 40 are sleeved on the inner sleeve 30. The two semicircular outer sleeves 40 are annularly welded to the side walls of the positioning groove 260. The two semicircular outer sleeves 40 are butt welded.

[0101] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above-described embodiments only express several implementation methods of the present application, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the attached claims.

Claims

1. A motor housing, characterized in that: include: A cylindrical base (20) is surrounded to form a first space (201), the first space (201) being used to accommodate stator windings, the cylindrical base (20) being provided with oil pouring holes (202) and oil collecting holes (203) at intervals, the cylindrical base (20) comprising a first cylindrical base end surface (210) and a cylindrical base outer surface (220) connected to the first cylindrical base end surface (210), the cylindrical base outer surface (220) being provided with an annular groove (230), a plurality of first ribs (240) being provided at the bottom of the annular groove (230), a cooling water flow channel (250) being formed between two adjacent first ribs (240), the cooling water flow channel (250) being used to communicate with a cooling water pump, and the plurality of oil pouring holes (202) being provided close to two end surfaces of the cylindrical base (20); An inner sleeve (30), the inner sleeve (30) being sleeved on the outside of the cylindrical base (20), a cooling water cavity (301) being formed between the inner wall of the inner sleeve (30) and the outer wall of the cylindrical base (20), the cooling water cavity (301) being used to communicate with a cooling water pump, the inner sleeve (30) comprising an inner sleeve outer surface (310), a plurality of axial ribs (320) being provided on the inner sleeve outer surface (310), a cooling oil flow channel (330) being formed between two adjacent axial ribs (320); an outer sleeve (40), the outer sleeve (40) being sleeved on a side of the inner sleeve (30) away from the cylindrical base (20), an oil pouring cavity (401) and an oil collecting cavity (402) being formed between the inner wall of the outer sleeve (40) and the outer surface (310) of the inner sleeve, the oil pouring cavity (401) and the oil collecting cavity (402) respectively accommodating a plurality of cooling oil flow channels (330), the oil pouring cavity (401) being used to communicate with the oil outlet of the cooling oil pump and the oil pouring hole (202), and the oil collecting cavity (402) being used to communicate with the oil inlet of the cooling oil pump and the oil collecting hole (203); The outer surface (310) of the inner sleeve is provided with a first partition (311) and a second partition (312) at intervals in an annular direction. The surfaces of the first partition (311) and the second partition (312) away from the outer surface (310) of the inner sleeve are used to fit with the inner wall of the outer sleeve (40) to form the oil pouring cavity (401) and the oil collecting cavity (402). The outer sleeve (40) includes an outer sleeve inner surface (410). Two side walls of the annular groove (230) are respectively provided with positioning grooves (260) opposite to each other. The outer sleeve (40) is clamped in the positioning groove (260). Two first bosses (270) are arranged at intervals on the side walls of the positioning groove (260). The first partition (311) and the second partition (312) are respectively arranged in one-to-one correspondence with the two first bosses (270). The inner sleeve (30) is arranged between two opposite first bosses (270); the surface of the first boss (270) away from the bottom of the annular groove (230) is used to fit with the inner surface (410) of the outer sleeve; the side wall of the annular groove (230), the end surface of the inner sleeve (30) and the inner surface (410) of the outer sleeve form an oil sprinkling groove (280) and an oil collecting groove (290) spaced apart; the oil sprinkling hole (202) is provided at the bottom of the oil sprinkling groove (280); the oil collecting hole (203) is provided at the bottom of the oil collecting groove (290); the cooling oil flow channel (330) arranged opposite to the oil sprinkling groove (280) is communicated with the oil sprinkling groove (280); and the cooling oil flow channel (330) arranged opposite to the oil collecting groove (290) is communicated with the oil collecting groove (290).

2. The motor housing according to claim 1, characterized in that: The outer surface (310) of the inner sleeve is axially spaced apart from each other by a first axial rib group (110) and a second axial rib group (120); the first axial rib group (110) and the second axial rib group (120) respectively include a plurality of axial ribs (320); the plurality of axial ribs (320) of the first axial rib group (110) are arranged in an array, and the plurality of axial ribs (320) of the second axial rib group (120) are arranged in an array.

3. The motor housing according to claim 1, characterized in that: The first rib plate (240) is an annular rib plate structure, and each annular rib plate structure is provided with an opening (204).

4. The motor housing according to claim 3, characterized in that: The first rib plate (240) is a spiral annular rib plate structure.

5. The motor housing according to claim 1, characterized in that: The first cylindrical base end surface (210) is provided with a cooling water inlet (101), a cooling water outlet (102), a cooling oil inlet (103) and a cooling oil outlet (104) at intervals. The cooling water inlet (101) is used to communicate with the water outlet of the cooling water pump and the cooling water flow channel (250). The cooling water outlet (102) is used to communicate with the water inlet of the cooling water pump and the cooling water flow channel (250). The cooling oil inlet (103) is used to communicate with the oil pouring chamber (401) and the oil outlet of the cooling oil pump. The cooling oil outlet (104) is used to communicate with the oil collecting chamber (402) and the oil inlet of the cooling oil pump.

6. The motor housing according to claim 1, characterized in that: The circumferential distribution angles of the oil pouring chamber (401) and the oil collecting chamber (402) are equal.

7. The motor housing according to claim 1, characterized in that: There are a plurality of the oil pouring holes (202), the plurality of the oil pouring holes (202) are distributed circumferentially, and the circumferential distribution angle of the plurality of the oil pouring holes (202) is less than 180°.

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