Magnesium alloy water-cooled motor shell system

Abstract

The utility model discloses a magnesium alloy water cooling motor housing system, which comprises a magnesium alloy motor housing, an inlet water nozzle, an outlet water nozzle, an aluminum alloy outer water jacket, an aluminum alloy inner water jacket and a motor stator, the aluminum alloy inner water jacket is fixedly installed in the magnesium alloy motor housing, and the inner wall of the aluminum alloy inner water jacket is in hot pressing fit with the motor stator. The outer side of the aluminum alloy inner water jacket is nested in the aluminum alloy outer water jacket, the aluminum alloy inner water jacket and the aluminum alloy outer water jacket jointly form a water cavity, a first through hole is formed in the aluminum alloy outer water jacket close to the water cavity, two shell water nozzle inner holes with the same structure are formed in the magnesium alloy motor shell, a certain distance is reserved between the upper portion, the lower portion, the left portion and the right portion of the shell water nozzle inner holes, and an inlet water nozzle is installed in one shell water nozzle inner hole; the inlet water nozzle and the outlet water nozzle sequentially penetrate through the inner holes of the shell water nozzles and the first through holes formed in the aluminum alloy outer water jacket and are communicated with a water cavity formed between the aluminum alloy outer water jacket and the aluminum alloy inner water jacket.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle motor cooling technology, and in particular to a magnesium alloy water-cooled motor housing system. Background Technology

[0002] In the current trend of lightweighting hybrid transmissions, magnesium alloys, due to their low density (30% lighter than aluminum alloys), have become an ideal housing material. However, magnesium alloys are chemically reactive and corrode upon contact with water, making it impossible to directly use magnesium alloy housings in existing water-cooled motors. Current technologies use oil cooling to circumvent this problem, but oil cooling systems suffer from drawbacks such as low heat exchange efficiency and high cost.

[0003] Therefore, how to achieve the safe application of magnesium alloy housings in water-cooled motors is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] One objective of this invention is to provide a magnesium alloy water-cooled motor housing system. This invention achieves the safe application of magnesium alloy housings in water-cooled motors through a double water jacket and triple sealing design.

[0005] A magnesium alloy water-cooled motor housing system according to an embodiment of the present invention includes a magnesium alloy motor housing, an inlet water nozzle, an outlet water nozzle, an aluminum alloy outer water jacket, an aluminum alloy inner water jacket, and a motor stator. The aluminum alloy inner water jacket is fixedly installed inside the magnesium alloy motor housing. The inner wall of the aluminum alloy inner water jacket is thermally pressed into the motor stator. The outer side of the aluminum alloy inner water jacket is nested inside the aluminum alloy outer water jacket, and the two together form a water cavity. A first through hole is opened on the aluminum alloy outer water jacket near the water cavity. Two identical housing water nozzle inner holes with a certain distance between them are opened on the magnesium alloy motor housing. An inlet water nozzle is installed in one of the housing water nozzle inner holes. The water tap has an outlet water tap installed inside the inner hole of another housing water tap. Both the inlet and outlet water taps pass through the inner hole of the housing water tap and the first through hole opened in the aluminum alloy outer water jacket, and communicate with the water cavity formed between the aluminum alloy outer water jacket and the aluminum alloy inner water jacket. The upper end of the aluminum alloy inner water jacket is sealed to the upper end of the aluminum alloy outer water jacket by a rubber ring, and the lower end of the aluminum alloy inner water jacket is welded to the lower end of the aluminum alloy outer water jacket by friction stir welding. A first sealing ring is provided between the outer wall of the inlet and outlet water taps and the inner hole of the housing water tap. A second sealing ring is fitted at the root of both the inlet and outlet water taps and is interference-fitted with the inner diameter of the aluminum alloy outer water jacket.

[0006] Preferably, the aluminum alloy outer water jacket is disposed between the aluminum alloy inner water jacket and the magnesium alloy motor housing, and the outer wall of the aluminum alloy outer water jacket is in contact with and fixed to the inner wall of the magnesium alloy motor housing.

[0007] Preferably, the aluminum alloy inner water jacket is provided with bolt holes, and aluminum bolts are installed in the bolt holes. The aluminum alloy inner water jacket is fixedly connected to the magnesium alloy motor housing by passing the aluminum bolts through the bolt holes.

[0008] A magnesium alloy water-cooled motor housing system includes a magnesium alloy motor housing, an inlet water nozzle, an outlet water nozzle, an aluminum alloy outer water jacket, an aluminum alloy inner water jacket, and a motor stator. The aluminum alloy outer water jacket is fixedly installed inside the magnesium alloy motor housing. The inner wall of the aluminum alloy inner water jacket is thermally pressed into the motor stator. The outer side of the aluminum alloy inner water jacket is nested inside the aluminum alloy outer water jacket, and the two together form a water cavity. A first through hole is formed on the aluminum alloy outer water jacket near the water cavity. Two identical housing water nozzle inner holes with a certain distance between them are formed on the magnesium alloy motor housing. An inlet water nozzle is installed in one housing water nozzle inner hole, and the other housing... An outlet water nozzle is installed inside the inner hole of the water faucet. Both the inlet and outlet water nozzles pass sequentially through the inner hole of the water faucet housing and the first through hole opened in the aluminum alloy outer water jacket, and communicate with the water cavity formed between the aluminum alloy outer and inner water jackets. The upper end of the aluminum alloy inner water jacket is welded to the upper end of the aluminum alloy outer water jacket by friction stir welding, and the lower end of the aluminum alloy inner water jacket is welded to the lower end of the aluminum alloy outer water jacket by friction stir welding. A first sealing ring is provided between the outer wall of the inlet and outlet water nozzles and the inner hole of the water faucet housing. A second sealing ring is fitted at the root of both the inlet and outlet water nozzles and is interference-fitted with the inner diameter of the aluminum alloy outer water jacket.

[0009] Preferably, the aluminum alloy outer water jacket is provided with bolt holes, and aluminum bolts are installed in the bolt holes. The aluminum alloy outer water jacket is fixedly connected to the magnesium alloy motor housing by passing the aluminum bolts through the bolt holes.

[0010] Preferably, the upper and lower ends of the aluminum alloy inner water jacket are fixed to the aluminum alloy outer water jacket by friction stir welding.

[0011] Preferably, a sealing gasket is installed between the outer wall of the inlet and outlet water nozzles and the outer edge of the inner hole of the water nozzle near the housing. The inlet and outlet water nozzles are sequentially equipped with a sealing gasket, a first sealing ring, and a second sealing ring from the end away from the aluminum alloy outer water jacket to the end near the aluminum alloy outer water jacket.

[0012] Preferably, the potential difference between the aluminum alloy outer water jacket and the aluminum alloy inner water jacket and the magnesium alloy motor housing is ≤0.6V; the outer surface of the motor stator is hot-pressed into the inner wall of the aluminum alloy inner water jacket, and the interference fit between the outer surface of the motor stator and the inner wall of the aluminum alloy inner water jacket is 0.03-0.05mm.

[0013] Preferably, the cross-sectional shape of the water cavity formed between the outer aluminum alloy water jacket and the inner aluminum alloy water jacket is rectangular. The outer wall of the inner aluminum alloy water jacket is provided with a concave annulus, and the cross-section of the concave annulus is consistent with the cross-section of the water cavity. The inlet and outlet water nozzles have the same structure. Both the inlet and outlet water nozzles are L-shaped water nozzles. The inlet orientation of the L-shaped water nozzle is opposite to the outlet orientation of the L-shaped water nozzle.

[0014] The beneficial effects of this utility model are:

[0015] (1) The present invention provides a magnesium alloy water-cooled motor housing system by improving the aluminum alloy inner water jacket and adding an aluminum alloy outer water jacket. At the same time, the inlet and outlet water nozzles are designed to be directly connected to the aluminum alloy outer water jacket, so that the magnesium alloy motor housing is isolated from water. Meanwhile, the aluminum alloy outer water jacket and the magnesium alloy motor housing are in contact. Because the potential difference is relatively close, galvanic corrosion will not occur. Finally, the application of magnesium alloy in the water-cooled motor transmission assembly is realized.

[0016] (2) This utility model provides a magnesium alloy water-cooled motor housing system. Through triple sealing, the sealing gasket and the first sealing ring seal the inlet water nozzle, the outlet water nozzle and the magnesium alloy motor housing to prevent oil leakage inside the transmission; the second sealing ring cooperates with the aluminum alloy outer water jacket to prevent coolant leakage in the water cavity; the aluminum alloy outer water jacket and the aluminum alloy inner water jacket are welded by rubber ring or friction stir welding to prevent water in the water cavity from entering the transmission and causing oil emulsification. This utility model isolates the magnesium alloy motor housing, which reacts with water, from water, and realizes the use of magnesium alloy instead of aluminum alloy as the material for the motor housing, thus achieving a lightweight design of the motor.

[0017] (3) The assembly method and assembly process used in the magnesium alloy water-cooled motor housing system of this utility model are similar to those of the aluminum alloy motor housing cooling system, and no special equipment or special process is required. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a magnesium alloy water-cooled motor housing system proposed in this utility model;

[0020] Figure 2 This is a partially enlarged schematic diagram of a magnesium alloy water-cooled motor housing system proposed in this utility model;

[0021] Figure 3 This is a perspective view of a magnesium alloy water-cooled motor housing system proposed in this utility model.

[0022] In the diagram: 1-Inlet water nozzle, 101-Inner hole of the water nozzle shell, 2-Sealing gasket, 301-First sealing ring, 302-Second sealing ring, 4-Outer water jacket of aluminum alloy, 401-First through hole, 5-Rubber ring, 6-Inner water jacket of aluminum alloy, 601-Concave annulus, 7-Motor stator, 8-Friction stir welding, 9-Water cavity, 10-Magnesium alloy motor shell, 11-Outlet water nozzle. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] Example 1

[0025] refer to Figure 1-3 A magnesium alloy water-cooled motor housing system includes a magnesium alloy motor housing 10, an inlet water nozzle 1, an outlet water nozzle 11, an aluminum alloy outer water jacket 4, an aluminum alloy inner water jacket 6, and a motor stator 7. The aluminum alloy inner water jacket 6 is fixedly installed inside the magnesium alloy motor housing 10, and its inner wall is thermally pressed into the motor stator 7. The outer side of the aluminum alloy inner water jacket 6 is nested inside the aluminum alloy outer water jacket 4, and the two together form a water cavity 9. A first through hole 401 is opened on the aluminum alloy outer water jacket 4 near the water cavity 9. Two identical housing water nozzle inner holes 101 with a certain distance between them are opened on the magnesium alloy motor housing 10. The inlet water nozzle 1 is installed in one housing water nozzle inner hole 101, and the other housing water nozzle... An outlet water nozzle 11 is installed inside the inner hole 101. Both the inlet water nozzle 1 and the outlet water nozzle 11 pass through the inner hole 101 of the housing water nozzle and the first through hole 401 opened in the aluminum alloy outer water sleeve 4, and communicate with the water cavity 9 formed between the aluminum alloy outer water sleeve 4 and the aluminum alloy inner water sleeve 6. The upper end of the aluminum alloy inner water sleeve 6 is sealed with the upper end of the aluminum alloy outer water sleeve 4 by a rubber ring 5, and the lower end of the aluminum alloy inner water sleeve 6 is welded to the lower end of the aluminum alloy outer water sleeve 4 by friction stir welding 8. A first sealing ring 301 is provided between the outer wall of the inlet water nozzle 1 and the outlet water nozzle 11 and the inner hole 101 of the housing water nozzle. A second sealing ring 302 is fitted at the root of the inlet water nozzle 1 and the inner diameter of the aluminum alloy outer water sleeve 4 is interference fit.

[0026] A water cavity is formed between the outer and inner aluminum alloy water jackets. The inner aluminum alloy water jacket is connected to the magnesium alloy motor housing via aluminum bolts, sealed at the top with a rubber ring and at the bottom with friction stir welding. This combination maintains the connection strength and achieves a seal. The rubber ring and friction stir welding work together to prevent water from the water cavity from entering the transmission and causing oil emulsification.

[0027] Preferably, the aluminum alloy outer water jacket 4 is disposed between the aluminum alloy inner water jacket 6 and the magnesium alloy motor housing 10, and the outer wall of the aluminum alloy outer water jacket 4 is in contact with and fixed to the inner wall of the magnesium alloy motor housing 10.

[0028] Preferably, the aluminum alloy inner water jacket 6 is provided with bolt holes, and aluminum bolts are installed in the bolt holes. The aluminum alloy inner water jacket 6 is fixedly connected to the magnesium alloy motor housing 10 by the aluminum bolts passing through the bolt holes.

[0029] Preferably, a sealing gasket 2 is installed between the outer wall of the inlet water nozzle 1 and the outer edge of the inner hole 101 of the water nozzle near the housing. The inlet water nozzle 1 and the outlet water nozzle 11 are sequentially equipped with a sealing gasket 2, a first sealing ring 301 and a second sealing ring 302 from the end away from the aluminum alloy outer water jacket 4 to the end near the aluminum alloy outer water jacket 4.

[0030] Preferably, the potential difference between the aluminum alloy outer water jacket 4 and the aluminum alloy inner water jacket 6 and the magnesium alloy motor housing 10 is ≤0.6V; the outer surface of the motor stator 7 is hot-pressed into the inner wall of the aluminum alloy inner water jacket 6, and the interference fit between the outer surface of the motor stator 7 and the inner wall of the aluminum alloy inner water jacket 6 is 0.03-0.05mm.

[0031] Preferably, the cross-sectional shape of the water cavity 9 formed between the aluminum alloy outer water jacket 4 and the aluminum alloy inner water jacket 6 is rectangular. The outer wall of the aluminum alloy inner water jacket 6 is provided with a concave annulus 601. The cross-section of the concave annulus 601 is consistent with the cross-section of the water cavity 9. The inlet nozzle 1 and the outlet nozzle 11 have the same structure. Both the inlet nozzle 1 and the outlet nozzle 11 adopt L-shaped nozzles. The inlet orientation of the L-shaped nozzle of the inlet nozzle 1 is opposite to the outlet orientation of the L-shaped nozzle of the outlet nozzle 11.

[0032] Example 2

[0033] refer to Figure 1-3A magnesium alloy water-cooled motor housing system includes a magnesium alloy motor housing 10, an inlet water nozzle 1, an outlet water nozzle 11, an aluminum alloy outer water jacket 4, an aluminum alloy inner water jacket 6, and a motor stator 7. The aluminum alloy outer water jacket 4 is fixedly installed inside the magnesium alloy motor housing 10. The inner wall of the aluminum alloy inner water jacket 6 is thermally pressed into the motor stator 7. The outer side of the aluminum alloy inner water jacket 6 is nested inside the aluminum alloy outer water jacket 4, and the two together form a water cavity 9. A first through hole 401 is opened on the aluminum alloy outer water jacket 4 near the water cavity 9. Two identical housing water nozzle inner holes 101 with a certain distance between them are opened on the magnesium alloy motor housing 10. The inlet water nozzle 1 is installed in one housing water nozzle inner hole 101, and the other housing water nozzle inner hole 101 is installed in the other housing water nozzle inner hole 101. An outlet water nozzle 11 is installed inside the housing. Both the inlet water nozzle 1 and the outlet water nozzle 11 pass through the inner hole 101 of the housing water nozzle and the first through hole 401 of the aluminum alloy outer water sleeve 4, and communicate with the water cavity 9 formed between the aluminum alloy outer water sleeve 4 and the aluminum alloy inner water sleeve 6. The upper end of the aluminum alloy inner water sleeve 6 is welded to the upper end of the aluminum alloy outer water sleeve 4 by friction stir welding 8, and the lower end of the aluminum alloy inner water sleeve 6 is welded to the lower end of the aluminum alloy outer water sleeve 4 by friction stir welding 8. A first sealing ring 301 is provided between the outer wall of the inlet water nozzle 1 and the inner hole 101 of the housing water nozzle. A second sealing ring 302 is fitted at the root of the inlet water nozzle 1 and the inner diameter of the aluminum alloy outer water sleeve 4 is interference fit.

[0034] When the aluminum alloy outer water jacket is fixed to the magnesium alloy motor housing by aluminum bolts, the upper end of the aluminum alloy inner water jacket is welded to the upper end of the aluminum alloy outer water jacket by friction stir welding, and the lower end of the aluminum alloy inner water jacket is welded to the lower end of the aluminum alloy outer water jacket by friction stir welding. The connection and sealing are achieved by friction stir welding.

[0035] Preferably, the aluminum alloy outer water jacket 4 is provided with bolt holes, and aluminum bolts are installed in the bolt holes. The aluminum alloy outer water jacket 4 is fixedly connected to the magnesium alloy motor housing 10 by the aluminum bolts passing through the bolt holes.

[0036] Preferably, the upper and lower ends of the aluminum alloy inner water jacket 6 are fixed to the aluminum alloy outer water jacket 4 by friction stir welding 8.

[0037] Preferably, a sealing gasket 2 is installed between the outer wall of the inlet water nozzle 1 and the outer edge of the inner hole 101 of the water nozzle near the housing. The inlet water nozzle 1 and the outlet water nozzle 11 are sequentially equipped with a sealing gasket 2, a first sealing ring 301 and a second sealing ring 302 from the end away from the aluminum alloy outer water jacket 4 to the end near the aluminum alloy outer water jacket 4.

[0038] Preferably, the potential difference between the aluminum alloy outer water jacket 4 and the aluminum alloy inner water jacket 6 and the magnesium alloy motor housing 10 is ≤0.6V; the outer surface of the motor stator 7 is hot-pressed into the inner wall of the aluminum alloy inner water jacket 6, and the interference fit between the outer surface of the motor stator 7 and the inner wall of the aluminum alloy inner water jacket 6 is 0.03-0.05mm.

[0039] Preferably, the cross-sectional shape of the water cavity 9 formed between the aluminum alloy outer water jacket 4 and the aluminum alloy inner water jacket 6 is rectangular. The outer wall of the aluminum alloy inner water jacket 6 is provided with a concave annulus 601. The cross-section of the concave annulus 601 is consistent with the cross-section of the water cavity 9. The inlet nozzle 1 and the outlet nozzle 11 have the same structure. Both the inlet nozzle 1 and the outlet nozzle 11 adopt L-shaped nozzles. The inlet orientation of the L-shaped nozzle of the inlet nozzle 1 is opposite to the outlet orientation of the L-shaped nozzle of the outlet nozzle 11.

[0040] This utility model discloses a magnesium alloy water-cooled motor housing system. By improving the inner aluminum alloy water jacket and adding an outer aluminum alloy water jacket, and designing the inlet and outlet water nozzles to be directly connected to the outer aluminum alloy water jacket, the magnesium alloy motor housing is isolated from water. At the same time, the outer aluminum alloy water jacket and the magnesium alloy motor housing are in contact. Because the potential difference is relatively close, galvanic corrosion will not occur. Ultimately, the application of magnesium alloy in the water-cooled motor transmission assembly is realized.

[0041] The inlet and outlet water nozzles are the key components connecting the motor stator cooling water channels and the vehicle's circulating cooling water. The vehicle's circulating cooling water enters the water chamber through the inlet nozzle, where it circulates and cools the motor stator. The cooling water then exits through the outlet nozzle and returns to the vehicle's circulation system. The inlet and outlet water nozzles are sealed to the magnesium alloy motor housing with gaskets to prevent oil leakage from the transmission.

[0042] The first sealing ring is installed on the inlet and outlet water nozzles. The first sealing ring fits into the inner hole of the water nozzle of the magnesium alloy motor housing. It has the same function as the sealing gasket, which is to prevent the oil inside the transmission from flowing out from here and causing leakage. This sealing ring and sealing gasket provide double sealing protection.

[0043] Both the outer and inner aluminum alloy water jackets are made of aluminum alloy. The aluminum alloy water jackets are fixed in contact with the magnesium alloy motor housing, and the potential difference between the two is relatively close, so galvanic corrosion will not occur.

[0044] During transmission operation, the vehicle's external circulating water enters the water chamber through the inlet nozzle, and then the circulating water cools the motor stator. Since the magnesium alloy motor housing does not come into contact with water throughout the entire process, it is not subject to water corrosion, thus enabling the application of magnesium alloy in water-cooled motors.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A magnesium alloy water-cooled motor housing system, characterized in that, The system includes a magnesium alloy motor housing (10), an inlet water nozzle (1), an outlet water nozzle (11), an aluminum alloy outer water jacket (4), an aluminum alloy inner water jacket (6), and a motor stator (7). The aluminum alloy inner water jacket (6) is fixedly installed inside the magnesium alloy motor housing (10). The inner wall of the aluminum alloy inner water jacket (6) is heat-pressed into the motor stator (7). The outer side of the aluminum alloy inner water jacket (6) is nested inside the aluminum alloy outer water jacket (4), and the two together form a water cavity (9). A first through hole (401) is opened on the aluminum alloy outer water jacket (4) near the water cavity (9). Two identical housing water nozzle inner holes (101) with a certain distance between them are opened on the magnesium alloy motor housing (10). The inlet water nozzle (1) is installed in one housing water nozzle inner hole (101), and the outlet water nozzle (11) is installed in the other housing water nozzle inner hole (101). The spitting nozzle (11), the inlet nozzle (1), and the outlet nozzle (11) all pass through the inner hole (101) of the housing nozzle and the first through hole (401) of the aluminum alloy outer water jacket (4) in sequence, and communicate with the water cavity (9) formed between the aluminum alloy outer water jacket (4) and the aluminum alloy inner water jacket (6); the upper end of the aluminum alloy inner water jacket (6) is sealed with the upper end of the aluminum alloy outer water jacket (4) by a rubber ring (5), and the lower end of the aluminum alloy inner water jacket (6) is welded to the lower end of the aluminum alloy outer water jacket (4) by friction stir welding (8); the outer wall of the inlet nozzle (1) and the outlet nozzle (11) are provided with a first sealing ring (301) between them and the inner hole (101) of the housing nozzle; the root of the inlet nozzle (1) and the outlet nozzle (11) are fitted with a second sealing ring (302) and are interference fit with the inner diameter of the aluminum alloy outer water jacket (4).

2. The magnesium alloy water-cooled motor housing system according to claim 1, characterized in that, The aluminum alloy outer water jacket (4) is disposed between the aluminum alloy inner water jacket (6) and the magnesium alloy motor housing (10), and the outer wall of the aluminum alloy outer water jacket (4) is in contact with and fixed to the inner wall of the magnesium alloy motor housing (10).

3. The magnesium alloy water-cooled motor housing system according to claim 1, characterized in that, The aluminum alloy inner water jacket (6) is provided with bolt holes, and aluminum bolts are installed in the bolt holes. The aluminum alloy inner water jacket (6) is fixedly connected to the magnesium alloy motor housing (10) by passing the aluminum bolts through the bolt holes.

4. A magnesium alloy water-cooled motor housing system, characterized in that, The system includes a magnesium alloy motor housing (10), an inlet water nozzle (1), an outlet water nozzle (11), an aluminum alloy outer water jacket (4), an aluminum alloy inner water jacket (6), and a motor stator (7). The aluminum alloy outer water jacket (4) is fixedly installed inside the magnesium alloy motor housing (10). The inner wall of the aluminum alloy inner water jacket (6) is hot-pressed into the motor stator (7). The outer side of the aluminum alloy inner water jacket (6) is nested inside the aluminum alloy outer water jacket (4), and the two together form a water cavity (9). A first through hole (401) is opened on the aluminum alloy outer water jacket (4) near the water cavity (9). Two identical housing water nozzle inner holes (101) with a certain distance between them are opened on the magnesium alloy motor housing (10). The inlet water nozzle (1) is installed in one housing water nozzle inner hole (101), and the outlet water nozzle is installed in the other housing water nozzle inner hole (101). (11) The inlet water nozzle (1) and the outlet water nozzle (11) pass through the inner hole (101) of the housing water nozzle and the first through hole (401) of the aluminum alloy outer water jacket (4) in sequence, and communicate with the water cavity (9) formed between the aluminum alloy outer water jacket (4) and the aluminum alloy inner water jacket (6); the upper end of the aluminum alloy inner water jacket (6) is welded to the upper end of the aluminum alloy outer water jacket (4) by friction stir welding (8), and the lower end of the aluminum alloy inner water jacket (6) is welded to the lower end of the aluminum alloy outer water jacket (4) by friction stir welding (8); the outer wall of the inlet water nozzle (1) and the outlet water nozzle (11) are provided with a first sealing ring (301) between them and the inner hole (101) of the housing water nozzle; the root of the inlet water nozzle (1) and the outlet water nozzle (11) are fitted with a second sealing ring (302) and are interference fit with the inner diameter of the aluminum alloy outer water jacket (4).

5. A magnesium alloy water-cooled motor housing system according to claim 4, characterized in that, The aluminum alloy outer water jacket (4) is provided with bolt holes, and aluminum bolts are installed in the bolt holes. The aluminum alloy outer water jacket (4) is fixedly connected to the magnesium alloy motor housing (10) by passing the aluminum bolts through the bolt holes.

6. A magnesium alloy water-cooled motor housing system according to claim 4, characterized in that, The upper and lower ends of the aluminum alloy inner water jacket (6) are fixed to the aluminum alloy outer water jacket (4) by friction stir welding (8).

7. A magnesium alloy water-cooled motor housing system according to claim 1 or 4, characterized in that, A sealing gasket (2) is installed between the outer wall of the inlet water nozzle (1) and the outer edge of the inner hole (101) of the water nozzle near the housing. A sealing gasket (2), a first sealing ring (301) and a second sealing ring (302) are installed sequentially from the end away from the aluminum alloy outer water jacket (4) to the end near the aluminum alloy outer water jacket (4).

8. A magnesium alloy water-cooled motor housing system according to claim 1 or 4, characterized in that, The potential difference between the aluminum alloy outer water jacket (4) and the aluminum alloy inner water jacket (6) and the magnesium alloy motor housing (10) is ≤0.6V; the outer surface of the motor stator (7) is hot-pressed into the inner wall of the aluminum alloy inner water jacket (6), and the interference fit between the outer surface of the motor stator (7) and the inner wall of the aluminum alloy inner water jacket (6) is 0.03-0.05mm.

9. A magnesium alloy water-cooled motor housing system according to claim 1 or 4, characterized in that, The cross-sectional shape of the water cavity (9) formed between the aluminum alloy outer water jacket (4) and the aluminum alloy inner water jacket (6) is rectangular. The outer wall of the aluminum alloy inner water jacket (6) is provided with a concave ring (601). The cross-section of the concave ring (601) is consistent with the cross-section of the water cavity (9). The inlet nozzle (1) and the outlet nozzle (11) have the same structure. Both the inlet nozzle (1) and the outlet nozzle (11) adopt L-shaped nozzles. The inlet orientation of the L-shaped nozzle of the inlet nozzle (1) is opposite to the outlet orientation of the L-shaped nozzle of the outlet nozzle (11).

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