Aluminum alloy die-cast motor shell with water-cooling structure

Abstract

The utility model discloses a kind of water cooling structure of casing and aluminium alloy die-casting motor shell with it, it is related to motor manufacturing technical field, comprising: shell, including side wall part;Waterway insert, the waterway insert includes the main water inlet end of upper side and the main water outlet end of lower side, two detours branch flow channels are arranged between the main water inlet end and the main water outlet end;Prepared sealed waterway insert, then the closed waterway insert is placed in mould and the die-casting forming of shell is carried out, so that the detours branch flow channels of waterway insert can be at least covered by cladding cavity, avoid detours branch flow channel portion and the side wall part after die-casting appear loose between and affect cooling effect, and the die-casting material of branch stream separation space position also be conducive to improving the structural strength of shell, greatly improve die-casting qualification rate, and finished product qualification rate.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, and in particular to a water-cooled housing structure and an aluminum alloy die-cast motor housing having the same. Background Technology

[0002] Water-cooled motor housings utilize their own water-cooling structure to achieve heat dissipation and cooling of the motor, which is beneficial to the stability of motor operation.

[0003] Existing water-cooled housing structures sometimes involve first preparing a spiral water channel core, then installing the core in a mold and die-casting it to obtain a water-cooled housing with water channels. However, this structure is prone to localized ineffective filling during the die-casting process, resulting in insufficient contact between the water channel core and the casting. This affects both the cooling effect and the structural strength of the housing.

[0004] Some water-cooling structures use a mold cavity design for heat dissipation channels, with heat dissipation fins distributed within these channels. Molten aluminum is filled into the mold cavity using a die-casting machine, forming the casting and heat dissipation channels. A steel sleeve is then pressed in to form a sealed cavity as the water-cooling channel structure. However, the cooling cavity requires the installation of sealing strips at the sealing groove location to ensure the water-cooling structure does not leak. These sealing strips are prone to aging after prolonged use, and phenomena such as air entrapment, cold shuts, and undercasting can easily occur at the sealing groove location, resulting in exposed pores after machining the sealing groove. All these factors affect the sealing performance. Utility Model Content

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a water-cooled housing structure and an aluminum alloy die-cast motor housing having the same structure.

[0006] According to a first aspect of the present invention, a water-cooled casing structure includes: a casing, including a sidewall portion, the sidewall portion forming a casing cavity, the sidewall portion having a covering cavity, and the casing having a vertical axis; a water channel insert located within the covering cavity of the sidewall portion, the water channel insert including an upper main water inlet and a lower main water outlet, two meandering branch channels being provided between the main water inlet and the main water outlet, the meandering branch channels being S-shaped meandering structures formed by bending, the meandering branch channels including transverse sections and bent meandering sections, each of the transverse sections being arranged in several layers from top to bottom, and a space being left between the bent meandering sections of the two meandering branch channels as a branch separation space.

[0007] According to some embodiments of this utility model, a main water inlet end outer positioning step is formed between the lower part of the main water inlet end located away from the vertical axis and the upper end face of the meandering branch channel; a main water outlet end outer positioning step is formed between the upper part of the main water outlet end located away from the vertical axis and the lower end face of the meandering branch channel; the main water inlet end outer positioning step and the main water outlet end outer positioning step lock the cavity wall of the encapsulated cavity.

[0008] According to some embodiments of this utility model, a positioning step is formed between the lower end face of the main inlet end near the vertical axis and the side wall of the meandering branch channel; a positioning step is formed between the upper end face of the main outlet end near the vertical axis and the side wall of the meandering branch channel; the positioning steps of the main inlet end and the positioning steps of the main outlet end lock the cavity wall of the encapsulating cavity.

[0009] According to some embodiments of this utility model, the upper ends of the two meandering branch channels are respectively connected to the left and right sides of the lower end of the main water inlet. The upper end of the main water inlet is provided with a water inlet, and the main water inlet is provided with a water inlet step. The upper end of the water inlet step is connected to the lower end of the water inlet hole wall.

[0010] According to some embodiments of the present invention, the waterway insert is provided with an insert positioning boss on the side wall away from the vertical axis.

[0011] According to some embodiments of the present invention, the meandering branch flow channel surrounds the housing cavity.

[0012] According to some embodiments of the present invention, a rounded corner is provided at the junction between the transverse segment and the bend / detour segment.

[0013] The water-cooled casing structure according to the embodiment of this utility model has at least the following technical effects: 1. A pre-prepared sealed water channel insert is placed in a mold for die casting of the shell. This ensures that the encapsulation cavity can cover at least the meandering branch channels of the water channel insert, preventing loosening between the meandering branch channels and the die-cast sidewalls, which would affect the cooling effect. Furthermore, the die-cast material at the branch separation space position also helps to improve the structural strength of the shell, greatly improving the die casting qualification rate and the finished product qualification rate. 2. After the shell is die-cast, the cavity wall of the shell's covering cavity can hold the main water inlet outer positioning step, the main water inlet inner positioning step, the main water outlet outer positioning step, and the main water outlet inner positioning step, ensuring that the main water inlet and main water outlet are sufficiently robust at the outer side of the shell. 3. The positioning boss on the water channel insert serves as an auxiliary fixing structure during the prefabrication of the water channel insert, preventing the water channel insert from rotating or shifting during die casting. It also improves the stability of the water channel insert after die casting, avoiding local loosening of the water channel insert that could affect cooling efficiency.

[0014] The aluminum alloy die-cast motor housing according to the second aspect of the present invention includes the housing water-cooling structure according to the first aspect of the present invention.

[0015] According to some embodiments of the present invention, the upper and lower sides of the housing are provided with housing docking portions, and a housing docking step is provided between the housing docking portions and the side wall portion.

[0016] According to some embodiments of the present invention, a housing positioning boss is provided on the side wall of the housing away from the vertical axis, and the housing positioning boss is located on the insert positioning boss of the waterway insert.

[0017] The aluminum alloy die-cast motor housing according to the embodiments of the present utility model has at least the following beneficial effects: 1. A pre-prepared sealed water channel insert is placed in a mold for die casting of the shell. This ensures that the encapsulation cavity can cover at least the meandering branch channels of the water channel insert, preventing loosening between the meandering branch channels and the die-cast sidewalls, which would affect the cooling effect. Furthermore, the die-cast material at the branch separation space position also helps to improve the structural strength of the shell, greatly improving the die casting qualification rate and the finished product qualification rate. 2. The housing positioning boss of the housing and the insert positioning boss of the water channel insert cooperate to ensure that the water channel insert will not rotate or shift in the housing after the housing is die-cast, and also to ensure that the housing is sufficiently stable and reliable when fixed in the motor.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional sectional view of the present invention; Figure 3 This is a perspective view of the waterway insert of this utility model; Figure 4 This is a perspective view of the bent and meandering section of this utility model; Figure 5This is a schematic diagram of the working process of the waterway insert of this utility model; Figure 6 This is a top view of the waterway insert of this utility model; Figure 7 yes Figure 6 Schematic diagram of section AA; Figure 8 yes Figure 7 A magnified view of region A in the middle.

[0020] Figure label: Shell 100, side wall 110, branch separation space 111, covering cavity 112, shell cavity 120, shell docking part 130, shell docking step 131, shell positioning boss 140; Waterway insert 200, main inlet end 210, main inlet end outer positioning step 211, main inlet end inner positioning step 212, inlet 213, inlet step section 214, main outlet end 220, main outlet end outer positioning step 221, main outlet end inner positioning step 222, meandering branch channel 230, transverse section 231, bend and meandering section 232, insert positioning boss 233, rounded corner section 234. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "multiple" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] The following is for reference. Figure 1 and Figure 2 Describes the water-cooled casing structure according to an embodiment of the present utility model.

[0026] like Figure 1 and Figure 2 As shown, the water-cooled housing structure according to an embodiment of the present invention includes a housing 100 and a water channel insert 200.

[0027] The housing 100 includes a sidewall portion 110, which surrounds and forms a housing cavity 120. The sidewall portion 110 has an enclosing cavity 112, and the housing 100 has a vertical axis. (Refer to...) Figure 3 , Figure 4 The waterway insert 200 is located in the covering cavity 112 of the side wall portion 110. The waterway insert 200 includes an upper main water inlet end 210 and a lower main water outlet end 220. Two meandering branch channels 230 are provided between the main water inlet end 210 and the main water outlet end 220. The meandering branch channels 230 are S-shaped meandering structures formed by bending. The meandering branch channels 230 include a transverse section 231 and a bent meandering section 232. Each transverse section 231 is arranged in several layers from top to bottom. A space is left between the bent meandering sections 232 of the two meandering branch channels 230 as a branch separation space 111.

[0028] For example, such as Figure 1 and Figure 2 As shown, the housing 100 includes a sidewall portion 110, which surrounds and forms a housing cavity 120, forming the main structure of the housing. The sidewall portion 110 has a covering cavity 112 capable of covering the water channel insert. The housing 100 can be manufactured by die casting. The housing 100 has a vertical axis. (Refer to...) Figure 3 , Figure 4 The water channel insert 200 is located within the enclosure cavity 112 of the side wall portion 110 and is fixed within the housing 100. The water channel insert 200 includes an upper main inlet end 210 and a lower main outlet end 220, with two meandering branch channels 230 disposed between them. The meandering branch channels 230 are S-shaped meandering structures formed by bending, and each includes a transverse section 231 and a bent meandering section 232. The transverse sections 231 are arranged in several layers from top to bottom to ensure that the meandering branch channels 230 are distributed around the housing cavity 120 to ensure cooling effect. A space 111 is left between the bent meandering sections 232 of the two meandering branch channels 230 as a branch separation space.

[0029] In practical work, refer to Figure 5Cooling water enters the water channel insert 200 from the main inlet 210 and then branches into various meandering branch channels 230. The meandering branch channels 230 ensure effective cooling of the housing 100, especially the housing cavity 120. The cooling water from the meandering branch channels 230 then converges at the main outlet 220 and is discharged.

[0030] In actual manufacturing, a pre-prepared sealed water channel insert 200 is used. The sealed water channel insert 200 is then placed in a mold for die casting of the shell 100, ensuring that the enclosing cavity 112 at least covers the meandering branch channels 230 of the water channel insert 200. Using the pre-fabricated water channel insert 200 replaces the original structure of a sealed groove feature + outer diamond-shaped steel sleeve, significantly improving the die casting yield and the finished product yield. Furthermore, the pre-fabricated water channel insert 200 is easy to iterate and improve; for example, the water channel insert 200 allows for more convenient design of denser heat sinks, significantly improving heat dissipation performance.

[0031] In addition, the original spiral tube + peripheral die-cast structure is replaced by a water channel insert 200 with a meandering branch flow channel 230. The die-cast structure with the branch separation space 111 left between the bends and meandering sections 232 of the two meandering branch flow channels 230 can avoid loosening between the meandering branch flow channel 230 and the die-cast side wall 110, which would affect the cooling effect. Moreover, the die-cast material at the branch separation space 111 position is also conducive to improving the structural strength of the shell 100. Both heat dissipation performance and structural strength can be greatly improved.

[0032] In some embodiments of this utility model, reference is made to Figure 3 A main inlet positioning step 211 is formed between the lower part of the main inlet end 210 on the side away from the vertical axis and the upper end face of the detour branch channel 230. A main outlet positioning step 221 is formed between the upper part of the main outlet end 220 on the side away from the vertical axis and the lower end face of the detour branch channel 230. The main inlet positioning step 211 and the main outlet positioning step 221 lock the cavity wall of the covering cavity 112. In this way, after the shell 100 is die-cast, the cavity wall of the covering cavity 112 of the shell 100 can lock the main inlet positioning step 211 and the main outlet positioning step 221, ensuring that the main inlet end 210 and the main outlet end 220 are sufficiently robust at the outer side of the shell 100.

[0033] In some embodiments of this utility model, reference is made to Figure 7 , Figure 8A positioning step 212 is formed between the lower end face of the main inlet end 210 near the vertical axis and the side wall of the detour branch channel 230; a positioning step 222 is formed between the upper end face of the main outlet end 220 near the vertical axis and the side wall of the detour branch channel 230. The positioning steps 212 and 222 of the main inlet end and the main outlet end lock the cavity wall of the covering cavity 112. In this way, after the shell 100 is die-cast, the cavity wall of the covering cavity 112 of the shell 100 can lock the positioning steps 212 and 222 of the main inlet end and the main outlet end, ensuring that the main inlet end 210 and the main outlet end 220 are sufficiently robust at the inner side of the shell 100.

[0034] In some embodiments of this utility model, reference is made to Figure 3 The upper ends of the two detour branch channels 230 are respectively connected to the left and right sides of the lower end of the main water inlet 210. The upper end of the main water inlet 210 is provided with a water inlet 213, and the main water inlet 210 is provided with a water inlet step 214. The upper end of the water inlet step 214 is connected to the lower end of the hole wall of the water inlet 213, and the lower end of the water inlet step 214 is connected to the inner wall of the detour branch channel 230. This can accelerate the cooling water entering the main water inlet 210 and quickly divert it into the detour branch channel 230, which is beneficial to improving the cooling efficiency.

[0035] In some embodiments of this utility model, the waterway insert 200 is provided with an insert positioning boss 233 on the side wall away from the vertical axis. This serves as an auxiliary structure during the prefabrication of the waterway insert 200 and also improves the stability of the waterway insert 200 after die casting the shell 100.

[0036] In some embodiments of this utility model, reference is made to Figure 3 , Figure 6 The meandering branch flow channel 230 surrounds the housing cavity 120, ensuring that the housing 100 and the components inside the housing cavity 120 can be adequately cooled.

[0037] In some embodiments of this utility model, a rounded corner 234 is provided at the junction between the transverse section 231 and the bend and detour section 232, so that when the cooling water enters the junction between the transverse section 231 and the bend and detour section 232, it can flow smoothly, especially avoiding the formation of eddies in the cooling water at the rounded corner 234, and avoiding the formation of local eddies that affect the cooling efficiency.

[0038] The aluminum alloy die-cast motor housing according to the second aspect of the present invention includes the housing water-cooling structure according to the first aspect of the present invention.

[0039] According to an embodiment of this utility model, the aluminum alloy die-cast motor housing employs the aforementioned water-cooling structure. A sealed water channel insert 200 is fabricated using 3D metal printing. To prevent molten aluminum from entering the water channel insert 200 during die casting, both the main water inlet 210 and the main water outlet 220 are initially made closed. After die casting, the inlet of the main water inlet 210 and the outlet of the main water outlet 220 are then machined open. The main water inlet 210 and the main water outlet 220 can be connected to an external circulating cooling system to achieve a circulating cooling effect.

[0040] The enclosed water channel insert 200 is placed into the mold of the die-casting machine using a robotic arm for high-pressure die casting. The 3D-printed enclosed water channel insert 200 replaces the original sealing groove feature + outer diamond-shaped steel sleeve structure, significantly improving the die-casting yield and finished product yield. Furthermore, the 3D-printed enclosed water channel insert 200 allows for easier and faster iteration, and it facilitates the design of denser heat sinks. The 3D-printed insert eliminates the need for molds, resulting in significantly improved heat dissipation performance.

[0041] In addition, the original spiral tube + peripheral die-cast structure is replaced by a 3D metal printed closed water channel insert 200. The die-cast structure of the branch separation space 111 left between the bend and detour section 232 of the two detour branch channels 230 can avoid loosening between the detour branch channel 230 and the die-cast side wall 110, which would affect the cooling effect. Moreover, the die-cast material at the branch separation space 111 position is also conducive to improving the structural strength of the shell 100. Both heat dissipation performance and structural strength can be greatly improved.

[0042] In some embodiments of this utility model, reference is made to Figure 1 , Figure 2 The housing 100 is provided with housing docking parts 130 on the upper and lower sides, and housing docking steps 131 are provided between the housing docking parts 130 and the side wall parts 110 to ensure that the housing 100 is sufficiently stable and reliable when fixed in the motor.

[0043] In some embodiments of this utility model, a housing positioning boss 140 is provided on the side wall of the housing 100 away from the vertical axis. The housing positioning boss 140 is located on the insert positioning boss 233 of the water channel insert 200, which ensures that the water channel insert 200 will not rotate or shift in the housing 100 after the housing 100 is die-cast, and also ensures that the housing 100 is sufficiently stable and reliable when fixed in the motor.

[0044] The water channel insert 200 has two annular positioning bosses on its periphery. The slider of the water-cooled housing mold has a corresponding process groove. After the slider is closed, it can prevent the water channel insert 200 from rotating or shifting during die casting.

[0045] Other components and operations of the motor housing according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0046] The following is for reference. Figure 1 and Figure 2 The water-cooled casing structure according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0047] like Figure 1 and Figure 2 As shown, the aluminum alloy die-cast motor housing according to an embodiment of the present invention includes a housing 100 and a water channel insert 200.

[0048] The housing 100 includes a side wall portion 110, which has a branch separation space 111, a housing cavity 120, a housing docking portion 130, a housing docking step 131, and a housing positioning boss 140.

[0049] The waterway insert 200 includes a main inlet end 210, a meandering branch channel 230, and a main outlet end 220. The main inlet end 210 is provided with an outer positioning step 211, an inner positioning step 212, an inlet 213, and an inlet step portion 214. The main outlet end 220 is provided with an outer positioning step 221 and an inner positioning step 222. The meandering branch channel 230 is provided with a transverse section 231, a bend and meandering section 232, an insert positioning boss 233, and a rounded corner portion 234.

[0050] In some embodiments of this utility model, the motor housing is composed of a ring-shaped motor housing mold core as the housing 100 and a 3D metal-printed closed water channel insert as the water channel insert 200. This changes the existing high-pressure die-casting water-cooled housing manufacturing process, eliminates the existing water-cooled housing sealing groove feature, and eliminates the existing diamond-shaped steel sleeve hot-fitting process, reducing the defect rate of air leakage and scrap due to die-casting voids. This utility model is reasonably designed, facilitating mold-open die-casting production, producing high-quality die-cast products, completely solving the air leakage problem of the sealing groove in the water-cooled motor housing, and eliminating the existing diamond-shaped steel sleeve hot-fitting process, thus shortening the manufacturing process. Furthermore, the 3D metal printing material for the water channel insert 200 is ALSi10Mg, an alloy with good thermal properties and low density, a thermal conductivity ≥150W / (m·K), and a part density ≥2.65g / cm³. 3This material is used to print sealed water channels, reducing weight while ensuring heat dissipation performance. Meanwhile, ALSi10Mg possesses good strength, hardness, and dynamic properties, capable of withstanding certain mechanical loads. The manufactured parts can undergo post-processing such as machining and welding, facilitating integration with die-casting molds and other components. It can also be used as an insert in die-casting molds. Its excellent high-temperature resistance and corrosion resistance ensure stable performance even in the high-temperature environment of die casting, preventing easy chemical reactions with molten aluminum and ensuring the reliability of the insert during the die-casting process. The 3D-printed water channel insert 200 allows for rapid iteration and arbitrary design, significantly improving water channel heat dissipation efficiency.

[0051] According to the water-cooled casing structure of this embodiment, the following effects can be achieved: cooling water enters the water channel insert 200 from the main inlet 210 and then flows into various meandering branch channels 230. The meandering branch channels 230 ensure the cooling effect on the casing 100, especially the casing cavity 120. Then, the cooling water in the meandering branch channels 230 is collected at the main outlet 220 and discharged, achieving a highly efficient cooling effect.

[0052] Using a pre-prepared sealed water channel insert 200, the sealed water channel insert 200 is placed in a mold for die casting of the shell 100, so that the covering cavity 112 can at least cover the meandering branch flow channels 230 of the water channel insert 200. Using the pre-made water channel insert 200 replaces the original structure of the sealing groove feature + outer diamond-shaped steel sleeve, greatly improving the die casting yield and the finished product yield. Furthermore, the pre-made water channel insert 200 is easy to iterate and improve; for example, the water channel insert 200 can be more easily designed with denser heat sinks, significantly improving heat dissipation performance. The original spiral tube + peripheral die-cast structure is replaced by a water channel insert 200 with a meandering branch flow channel 230. The die-cast structure with the branch separation space 111 left between the bends and meandering sections 232 of the two meandering branch flow channels 230 can avoid loosening between the meandering branch flow channel 230 and the die-cast side wall 110, which would affect the cooling effect. Moreover, the die-cast material at the branch separation space 111 position is also conducive to improving the structural strength of the shell 100. Both heat dissipation performance and structural strength can be greatly improved.

[0053] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing water cooling structure characterized by comprising: include: The housing (100) includes a sidewall portion (110) surrounding a housing cavity (120) having a covering cavity (112) and the housing (100) having a vertical axis; The waterway insert (200) is located in the covering cavity (112) of the side wall portion (110). The waterway insert (200) includes an upper main water inlet end (210) and a lower main water outlet end (220). Two meandering branch channels (230) are provided between the main water inlet end (210) and the main water outlet end (220). The meandering branch channels (230) are formed by bending into an S-shaped meandering structure. The meandering branch channels (230) include a transverse section (231) and a bent meandering section (232). Each transverse section (231) is arranged in several layers from top to bottom. A space is left between the bent meandering sections (232) of the two meandering branch channels (230) as a branch separation space (111).

2. The case water cooling structure according to claim 1, wherein A main inlet (211) is formed between the lower part of the main inlet (210) on the side away from the vertical axis and the upper end face of the detour branch channel (230). An outer positioning step (221) is formed between the upper part of the main outlet end (220) on the side away from the vertical axis and the lower end face of the meandering branch channel (230). The outer positioning step (211) at the main inlet end and the outer positioning step (221) at the main outlet end lock the cavity wall of the covering cavity (112).

3. The water-cooled casing structure according to claim 1, characterized in that, A positioning step (212) is formed between the lower end face of the main inlet end (210) near the vertical axis and the side wall of the meandering branch channel (230). A positioning step (222) is formed between the upper end face of the main outlet (220) near the vertical axis and the side wall of the meandering branch channel (230). The positioning step (212) inside the main water inlet and the positioning step (222) inside the main water outlet lock the cavity wall of the covering cavity (112).

4. The water-cooled casing structure according to claim 2, characterized in that, The upper ends of the two meandering branch channels (230) are respectively connected to the left and right sides of the lower end of the main water inlet (210). The upper end of the main water inlet (210) is provided with a water inlet (213). The main water inlet (210) is provided with a water inlet step (214). The upper end of the water inlet step (214) is connected to the lower end of the hole wall of the water inlet (213).

5. The water-cooled casing structure according to claim 1, characterized in that, The waterway insert (200) has an insert positioning boss (233) on its side wall away from the vertical axis.

6. The water-cooled casing structure according to claim 1, characterized in that, The meandering branch flow channel (230) surrounds the housing cavity (120).

7. The water-cooled casing structure according to claim 1, characterized in that, A rounded corner (234) is provided at the junction between the transverse segment (231) and the bend and meander segment (232).

8. An aluminum alloy die-cast motor housing, characterized in that, Includes the water-cooled casing structure as described in claim 1.

9. The aluminum alloy die-cast motor housing according to claim 8, characterized in that, The shell (100) is provided with shell docking parts (130) on the upper and lower sides, and a shell docking step (131) is provided between the shell docking parts (130) and the side wall part (110).

10. The aluminum alloy die-cast motor housing according to claim 8, characterized in that, The housing (100) has a housing positioning boss (140) on the side wall away from the vertical axis, and the housing positioning boss (140) is located on the insert positioning boss (233) of the waterway insert (200).

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