Motor shell and waterproof motor using same

Abstract

The utility model discloses a motor housing and a waterproof motor using the same, and the motor housing comprises a main housing which is provided with an accommodating cavity; the outlet box is integrally injection-molded on the main shell, and the outlet box and the main shell jointly form an opening communicated with the accommodating cavity; the metal layer is arranged on the inner wall of the accommodating cavity; the cover plate is suitable for being connected with the main shell in a matched mode to form a sealing cover for the opening; and a concave-convex inserted waterproof structure is formed between the cover plate and the matching surface of the edge of the opening.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor housing and a waterproof motor using the same. Background Technology

[0002] An electric motor housing typically includes a main housing for accommodating the stator and rotor, and a cover plate that mates with the main housing. Considering the reliability and stability of the motor during long-term use, most existing motors use cover plates made of metal. In environments with moisture or high humidity, the motor housing may experience varying degrees of oxidation or corrosion. Furthermore, moisture can enter the motor through the riveted gaps between the cover plate and the main housing, affecting normal operation and reducing the motor's lifespan.

[0003] In addition, the motor's terminal box and the motor housing are usually assembled structures. Assembled structures inevitably have gaps in their fit. The presence of these gaps can inevitably lead to moisture seepage, insufficient sealing and waterproofing performance, and metal corrosion.

[0004] To address the issue of moisture seeping into the motor through gaps in the joints, the current main solution is to add a waterproof outer casing to the existing motor. However, practical research has revealed that because the waterproof casing is still a piecework assembly structure, moisture can easily enter through the joints. Furthermore, adding a waterproof casing increases the overall size of the motor, potentially making it unsuitable for applications with limited installation space.

[0005] Based on the above, and considering the need to optimize the waterproof performance of the motor housing, further structural optimization is required. Utility Model Content

[0006] The primary objective of this invention is to provide a motor housing that addresses the technical challenge of balancing structural simplification with reliable waterproofing.

[0007] The second objective of this invention is to provide a waterproof motor to solve the technical problem of optimizing the waterproofness of its housing.

[0008] The motor housing of this utility model is implemented as follows:

[0009] An electric motor housing, comprising:

[0010] The main housing has a receiving cavity;

[0011] The outlet box is integrally injection molded onto the main housing, and the outlet box and the main housing together form an open opening that communicates with the receiving cavity.

[0012] A metal layer is disposed on the inner wall of the receiving cavity;

[0013] A cover plate adapted to mate with the main housing to form a cover for the opening; a waterproof structure with interlocking grooves is formed between the mating surfaces of the cover plate and the edge of the opening.

[0014] In an optional embodiment of this utility model, the metal layer is fixed to the inner wall of the receiving cavity by injection molding using a metal insert.

[0015] In an optional embodiment of this invention, the metal layer is made of a highly magnetically permeable metal material sprayed and fixed onto the inner wall of the receiving cavity.

[0016] In an optional embodiment of this utility model, the waterproof structure includes at least an annular protrusion protruding from the edge of the opening of the main housing and an annular groove recessed in the cover plate suitable for the annular protrusion to be inserted.

[0017] In an optional embodiment of this utility model, the cover plate and the main housing are engaged by at least two snap fasteners; and

[0018] Each of the buckles includes a buckle protruding from the outer side wall of the main housing, and a snap-fit ​​ear integrally formed with the cover plate for engaging with the buckle; the snap-fit ​​ear is provided with a slot suitable for the buckle to be inserted.

[0019] In an optional embodiment of this utility model, the outer side wall of the main housing is further provided with a pair of stops for limiting the two side walls of at least one snap-fit ​​ear along the depth direction of the receiving cavity, and the pair of stops are located on both sides of each snap-fit ​​block.

[0020] The waterproof motor of this utility model is achieved as follows:

[0021] A waterproof motor includes: a motor housing, a stator assembly and a rotor assembly disposed in a receiving cavity, and an output shaft that mates with a cover plate; wherein...

[0022] The output shaft is connected to the rotor assembly via a transmission gear set; and

[0023] The metal layer is used to connect with the lower, middle, and upper plates of the stator assembly to form a closed loop; and the metal layer has a notch corresponding to the lead box, suitable for accommodating the coil of the stator assembly.

[0024] In an optional embodiment of this invention, the notch extends through both axial ends of the metal layer along the depth direction of the receiving cavity; or

[0025] The notches are distributed in a U-shape on the metal layer along the depth direction of the receiving cavity.

[0026] In an optional embodiment of this utility model, a pair of baffles are provided on the inner wall of the receiving cavity to limit the two sides of the notch.

[0027] In an optional embodiment of this utility model, the cover plate is provided with a shaft hole for mating with the output shaft; and

[0028] The cover plate has an annular rib on its side end face facing the main housing and located at the edge of the shaft hole, for direct contact with the gear in the transmission gear set that is mounted on the output shaft.

[0029] In an optional embodiment of this utility model, the end of the cover plate facing the main housing is formed as a recessed cavity with a certain depth for accommodating the transmission gear;

[0030] The inner wall of the recessed cavity is provided with a pair of positioning grooves, which are respectively suitable for the insertion of a portion of the two side shoulders of the upper electrode plate.

[0031] In an optional embodiment of this utility model, at least one positioning post is provided on the inner bottom wall of the receiving cavity, and at least one positioning hole is provided on the lower electrode plate to allow the positioning post to pass through one-to-one.

[0032] By adopting the above technical solution, this utility model has the following beneficial effects: The motor housing and the waterproof motor using it, by integrally injection molding the terminal box onto the main housing, can prevent water seepage between the terminal box and the main housing; simultaneously, the waterproof structure prevents water from seeping into the motor through the gaps between the cover plate and the main housing. Therefore, this utility model can prevent water or other liquid contaminants from seeping into the motor from the application scenarios of the waterproof motor from a dual perspective, thereby extending the service life of the motor. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the waterproof motor of this utility model;

[0034] Figure 2 This is a cross-sectional view of the waterproof motor of this utility model;

[0035] Figure 3 This is an exploded view of the waterproof motor of this utility model;

[0036] Figure 4 This is a schematic diagram of the structure of the cover plate for the waterproof motor of this utility model;

[0037] Figure 5 This is a schematic diagram of the fit between the cover plate and the main housing of the waterproof motor of this utility model;

[0038] Figure 6This is a schematic diagram of the snap-fit ​​structure between the cover plate and the main housing of the waterproof motor of this utility model;

[0039] Figure 7 This is a schematic diagram of the mating structure between the metal layer and the stator assembly of the waterproof motor of this utility model;

[0040] Figure 8 This is a schematic diagram of the main housing plate of the waterproof motor of this utility model;

[0041] Figure 9 This is a schematic diagram of the metal layer structure of the waterproof motor of this utility model;

[0042] Figure 10 This is a schematic diagram of the positioning post of the main housing of the waterproof motor of this utility model;

[0043] Figure 11 This is a schematic diagram of the structure of the lower electrode plate of the waterproof motor of this utility model;

[0044] Figure 12 This is a schematic diagram of the fit between the lower electrode plate and the central hole shaft of the waterproof motor of this utility model;

[0045] Figure 13 This is a schematic diagram of the main housing and central shaft of the waterproof motor of this utility model.

[0046] In the diagram: Main housing 1, baffle 11, positioning post 12, boss 13, cable outlet box 2, receiving space 21, limiting block 22, metal layer 3, cover plate 4, annular groove 41, shaft hole 42, annular rib 43, positioning groove 44, mounting hole 45, annular thick wall 46, arc-shaped clearance groove 47, open opening 5, annular protrusion 51, locking block 61, locking ear 62, bayonet 63, baffle 65, stator assembly 71, rotor assembly 72, central shaft 721, lower electrode plate 711, middle electrode plate 712, upper electrode plate 713, positioning hole 7111, output shaft 8, coil 9, transmission gear set 100, gear 101. Detailed Implementation

[0047] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0048] Example 1:

[0049] Please see Figures 1 to 9 As shown, this embodiment provides a motor housing, including: a main housing 1, a terminal box 2, a metal layer 3, and a cover plate 4.

[0050] Specifically, firstly, there is a main housing 1, which has a receiving cavity; and a cable outlet box 2, which is integrally injection molded onto the main housing 1, and the cable outlet box 2 and the main housing 1 together form an open opening 5 that communicates with the receiving cavity. The cable outlet box 2 and the main housing 1 form an integral injection molded structure. Compared with the existing assembled cable outlet box 2, it can reduce the number of processes (separate production and then assembly) while meeting the cable outlet requirements, improve production efficiency, and improve sealing (as assembled structures have gaps). A cover plate 4 is adapted to mate with the main housing 1 to form a cover for the open opening 5; a waterproof structure with a concave-convex interlocking joint is formed between the mating surfaces of the cover plate 4 and the edge of the open opening 5.

[0051] Referring to the accompanying drawings, in one specific optional embodiment, the waterproof structure includes at least an annular protrusion 51 protruding from the edge of the opening 5 of the main housing 1, and an annular groove 41 recessed in the cover plate 4, suitable for embedding the annular protrusion 51. Here, the annular protrusion 51 and the annular groove 41 are continuously distributed in a complete ring, thereby effectively ensuring a reliable sealing fit between the main housing 1 and the cover plate 4. It is understood that an annular groove can also be formed on the main housing 1, and an annular protrusion on the cover plate 4. Alternatively, a ring of annular protrusion 51 and a ring of annular groove 41 can be formed simultaneously on the main housing 1, and a ring of annular groove 41 and a ring of annular protrusion 51 can be formed simultaneously on the cover plate 4, thereby forming two pairs of anti-contact waterproof structures between the main housing 1 and the cover plate 4. All of the above situations meet the usage requirements of this embodiment, and this embodiment does not impose absolute limitations on them.

[0052] In addition, regarding the fitting method between the cover plate 4 and the main housing 1:

[0053] Generally, the cover plate 4 is engaged with the main housing 1 by at least two snap fasteners (generally four snap fasteners are used). More specifically, each snap fastener includes a snap block 61 protruding from the outer side wall of the main housing 1, and a snap-fit ​​ear 62 integrally formed with the cover plate 4 for engaging with the snap block 61; the snap-fit ​​ear 62 is provided with a slot 63 suitable for the snap block 61 to be inserted.

[0054] More specifically, referring to the attached diagram, one optional scenario is provided: the width of the locking block 61 is C1, and the locking slot 63 forms a clearance fit with the locking block 61. When the locking block 61 and the locking slot 63 are engaged, they are connected by mutually parallel and fitting snap-fit ​​end faces K1. The locking block 61 has an inclined surface K2 that forms an acute angle with the snap-fit ​​end face K1. The angle formed by the inclined surface K2 and the snap-fit ​​end face K1 is less than 80° and greater than 15°. If the angle is too small, the snap-fit ​​strength will be insufficient; if it is too large, it will affect the snap-fit ​​size and the connection strength.

[0055] Based on the above, in one optional embodiment, the outer wall of the main housing 1 is further provided with a pair of stops 65 for limiting the two side walls of at least one latching ear 62 along the depth direction of the receiving cavity, and the pair of stops 65 are located on both sides of each latching block 61. Specifically, the stops 65 on both sides are clearance-fitted with the latching ear 62, which will not affect the installation, and can also play a guiding role when they are fitted with the two chamfers at the front end of the latching ear 62; at the same time, they can play a fixing role, and when the motor is twisted by external force, each pair of stops 65 provides support for the corresponding latching ear 62, preventing the external force from directly damaging the latching ear 62.

[0056] Furthermore, the metal layer 3 is disposed on the inner wall of the receiving cavity. It should be noted that, in this embodiment, in one optional implementation, the metal layer 3 is fixed to the inner wall of the receiving cavity by injection molding using a metal insert. In another optional implementation, the metal layer 3 is fixed to the inner wall of the receiving cavity by spraying with a highly magnetically permeable metal material, such as, but not limited to, nickel-iron alloy powder. Regardless of the method used to form the metal layer 3, its thickness is 0.8 mm, and the thickness of the main housing 1 is 2.4 mm.

[0057] In summary, the motor housing of this embodiment not only simplifies the overall structure and processing steps, but also optimizes the waterproof performance.

[0058] Example 2:

[0059] Please see Figures 1 to 13 As shown, based on the motor housing of Embodiment 1, this embodiment provides a waterproof motor, including: the motor housing of Embodiment 1, a stator assembly 71 and a rotor assembly 72 disposed in a receiving cavity, and an output shaft 8 that cooperates with the cover plate 4; wherein the output shaft 8 is connected to the rotor assembly 72 through a transmission gear set 100; and a metal layer 3 is used to connect with the lower electrode plate 711, the middle electrode plate 712 and the upper electrode plate 713 of the stator assembly 71 to form a closed loop.

[0060] Based on the above structure, it should be noted that a notch X is formed on the metal layer 3, corresponding to the lead box 2, suitable for accommodating the coil 9 of the stator assembly 71. Regarding this notch X, in a first optional embodiment, the notch X extends through both axial ends of the metal layer 3 along the depth direction of the receiving cavity. In this case, when the metal layer 3 of this embodiment is fixed to the inner wall of the receiving cavity by insert injection molding, the metal layer 3 can be directly bent from rectangular steel into a C-shaped structure. This processing method is simple and efficient, and can reduce the waste of materials. In a second optional embodiment, the notch X is distributed in a U-shape on the metal layer 3 along the depth direction of the receiving cavity. This notch X can be achieved by cutting.

[0061] Based on the above, regardless of the structure of the metal layer 3 used, in a specific optional processing configuration, a pair of retaining strips 11 are provided on the inner wall of the receiving cavity to limit the two sides of the notch X along the depth direction of the main housing 1 (here, the edges of the notch X are the edges extending along the depth direction of the receiving cavity). The design of the pair of retaining strips 11 can guide the installation of the metal layer 3, making the installation of the metal layer 3 more convenient and preventing misfitting or incorrect fitting due to incorrect angles. After installation, they also have a certain fixing and limiting effect on the metal layer 3.

[0062] Based on the above, it should be noted that, regarding the size of the metal layer 3 in this embodiment, in one case, the height of the metal layer 3 is the same as the depth L1 of the receiving cavity of the main housing 1. The depth L1 of the receiving cavity needs to be greater than or equal to the total height L2 of the upper electrode plate 713 and the lower electrode plate 711 of the stator along the depth direction of the receiving cavity. This ensures that the metal layer 3 can simultaneously make complete contact with the lower electrode plate 711, the middle electrode plate 712 and the upper electrode plate 713, ensuring complete circuit conduction.

[0063] In this embodiment, the main housing 1 formed by injection molding and the metal layer 3 are combined. Since the main housing 1 can form an external support for the metal layer 3, the thickness of the metal layer 3 can be greatly reduced. (The overall strength is supported by the main housing 1. The thickness of the metal layer 3 can be appropriately reduced while ensuring the stable operation of the magnetic circuit. That is, the sum of the thickness of the metal layer 3 and the main housing 1 is not less than the thickness of the pure metal shell used in the motor of the prior art.) Therefore, the size of the assembled motor can be reduced as much as possible.

[0064] Since the outlet box 2 in this embodiment is integrally formed on the main housing 1, in order to ensure that the outlet box 2 meets the usage requirements, a receiving space 21 for the outlet portion of the stator coil 9 is pre-formed inside the outlet box 2. This not only facilitates the assembly of the stator but also secures the stator coil 9. Furthermore, when the cover plate 4 and the main housing 1 are assembled in place, multiple limiting blocks 22 are formed to limit the terminals of the coil 9. When one end of the connecting wire is inserted into the motor, the terminal will bend upwards under force, and the limiting block 22 provides support to prevent the terminal from deforming and preventing the connecting wire from being inserted properly.

[0065] Based on the above structure, it should be noted that the cover plate 4 is provided with a shaft hole 42 for mating with the output shaft 8. In this embodiment, the cover plate 4 is formed entirely by injection molding. Compared to the prior art using a metal cover plate 4, which requires embedding a plastic mating ring into the inner wall of the shaft hole 42 to fit the output shaft 8, providing rotational support for the output shaft 8 while also ensuring good waterproof sealing performance, this embodiment directly uses a plastic cover plate 4, which can achieve this through the mating of the shaft hole 42 with the output shaft 8. This structure eliminates the need for a separate mating ring to mate with the shaft hole 42, reducing the gap between the mating ring and the shaft hole 42 caused by assembly. The side end face of the cover plate 4 facing the main housing 1 and located at the edge of the shaft hole 42 is provided with an annular rib 43 for direct contact with the gear 101 mounted on the output shaft 8 in the transmission gear set 100. The design of the annular rib 43 here prevents the gear 101 on the output shaft 8 from directly contacting the entire surface of the cover plate 4. Instead, the gear 101 contacts the annular rib 43, reducing the contact area and thus reducing friction on the gear 101.

[0066] Furthermore, it should be noted that the end of the cover plate 4 facing the main housing 1 is formed into a recessed cavity with a certain depth for accommodating the transmission gear set 100; the inner wall of the recessed cavity is provided with a pair of positioning grooves 44, which are respectively suitable for partial insertion of the two side shoulders of the upper electrode plate 713. Each positioning groove 44 is formed by two oppositely distributed protrusions. When the cover plate 4 is assembled with the main housing 1, the pair of positioning grooves 44 can fix the upper electrode plate 713, while the shoulders of the upper electrode plate 713 provide certain support for the cover plate 4.

[0067] Based on the above structure, it is also necessary to explain that at least one positioning post 12 is provided on the inner bottom wall of the receiving cavity, and at least one positioning hole 7111 is provided on the lower electrode plate 711 for the positioning post 12 to pass through one-to-one. Referring to the attached drawings, in an optional case, two positioning posts 12 are provided on the inner bottom wall of the receiving cavity to limit and fix the lower electrode plate 711. These posts fit with the positioning holes 7111 on the lower electrode plate 711 with a clearance fit, which will not affect the installation and ensures that the plate will not be affected or moved after installation.

[0068] In summary, this embodiment, by integrally injection molding the outlet box 2 onto the main housing 1, avoids gaps that could lead to water seepage between the outlet box 2 and the main housing 1 during assembly. Simultaneously, a waterproof structure prevents water from seeping into the motor through the gaps between the cover plate 4 and the main housing 1. Therefore, this invention provides a dual solution to prevent water or other liquid contaminants from penetrating the motor during its application, thereby extending the motor's service life.

[0069] Example 3:

[0070] Please see Figures 1 to 13 As shown, based on the waterproof motor of Embodiment 2, the cover plate 4 of the waterproof motor in this embodiment also has a mounting hole 45 for fixing the waterproof motor to the application scenario. In this embodiment, an annular thick wall 46 is formed in the depth direction of the mounting hole 45. The annular thick wall 46 can wrap the screw at the position of the mounting hole 45 to prevent direct contact with water and reduce the possibility of screw rust and corrosion. At the same time, it can also improve the strength of the mounting hole 45 position, make up for the insufficient hardness caused by the change of material, and ensure that it will not be damaged by external force during installation. The dimension B3 of the thickness of the cover plate 4 is about 2 / 3 of the thickness of the cover plate 4.

[0071] Based on the above structure, furthermore, an arc-shaped clearance groove 47 corresponding to each mounting hole 45 is formed on the outer wall of the cover plate 4. Specifically, when the waterproof motor is fixed to the application scenario for assembly, screws are used to fix the waterproof motor. In order to prevent interference with the screws and facilitate installation, a certain clearance space needs to be left. After adding the arc-shaped clearance groove 47, it is ensured that the wall thickness of the cover plate 4 and the main housing 1 at the corresponding position is at least greater than 1 / 2, to prevent the structural strength from being too low.

[0072] In summary, the waterproof motor of this embodiment is more convenient and efficient to install in application scenarios, and the resulting installation structure is also more reliable.

[0073] Example 4:

[0074] Please see Figures 1 to 13 As shown, based on the waterproof motor of Embodiment 2, the fixing method of the rotor's central shaft 721 of the waterproof motor in this embodiment is designed as follows:

[0075] In the first optional scenario, the lower electrode plate 711 and the central shaft 721 are directly riveted together to form the lower electrode plate assembly. The central shaft 721 can be directly riveted to the center of the lower electrode plate 711. In the second optional scenario, the central shaft 721 is directly riveted to the inner bottom wall of the receiving cavity, and the inner bottom wall of the receiving cavity here is provided with a boss 13 that matches the central hole of the lower electrode plate 711, which can be used to position and fix the lower electrode plate 711. In this case, the lower electrode plate 711 and the upper electrode plate 713 are interchangeable, and the upper electrode plate 713 can be directly used, reducing the number of parts. Theoretically, both of the above optional scenarios meet the usage requirements of this embodiment, and this embodiment does not make any absolute limitation on them.

[0076] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0077] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0078] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0079] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0080] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0081] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. An electrical machine housing, characterized in that, The utility model relates to an electric machine shell, and relates to the technical field of electric machine shell. The utility model discloses an electric machine shell, which comprises a main shell with a receiving cavity, a wire outlet box integrally injection molded on the main shell and jointly forming an open port with the main shell and the receiving cavity, a metal layer arranged on the inner wall of the receiving cavity, a cover plate adapted to be connected with the main shell to form a cover for the open port, and a waterproof structure in the form of a concave-convex plug-in connection between the cover plate and the edge of the open port. The metal layer is fixed on the inner wall of the receiving cavity by insert injection molding of a metal material. The metal layer is fixed on the inner wall of the receiving cavity by spraying of a metal material with high magnetic permeability. The waterproof structure comprises at least an annular protrusion arranged on the edge of the open port of the main shell and an annular groove arranged on the cover plate and adapted to be plugged by the annular protrusion.

2. The motor housing of claim 1, wherein, The cover plate and the main shell are connected by at least two buckles.

3. The motor housing of claim 1, wherein, Each of the buckles comprises a clamping block arranged on the outer side wall of the main shell and a clamping lug integrally formed on the cover plate and adapted to be connected with the clamping block, and the clamping lug is provided with a clamping hole adapted to be plugged by the clamping block.

4. The electrical machine housing according to claim 2 or 3, characterized in that The outer side wall of the main shell is further provided with a pair of stop blocks for limiting the two side end walls of at least one clamping lug along the depth direction of the receiving cavity, and the pair of stop blocks are located on the two sides of each clamping block.

5. The motor housing of claim 2 or 3, wherein, The utility model relates to an electric machine shell, and relates to the technical field of electric machine shell. The output shaft is connected with the rotor assembly through a transmission gear set.

6. The motor housing of claim 5, wherein, The metal layer is used to connect with the lower pole plate, the middle pole plate and the upper pole plate of the stator assembly to form a closed loop, and the metal layer is provided with a notch corresponding to the wire outlet box and adapted to accommodate the coil of the stator assembly.

7. A water resistant electric motor characterized by The notch penetrates the axial two ends of the metal layer along the depth direction of the receiving cavity, or the notch is distributed in the form of U on the metal layer along the depth direction of the receiving cavity. The inner wall of the receiving cavity is provided with a pair of stop bars for limiting the two side edges of the notch. The cover plate is provided with a shaft hole adapted to be connected with the output shaft, and the side end surface of the cover plate towards the main shell and located at the edge of the shaft hole is provided with an annular rib adapted to directly contact with the gear of the transmission gear set and sleeved on the output shaft. The end of the cover plate towards the main shell is formed as a recessed cavity with a certain depth for accommodating the transmission gear. The inner wall of the recessed cavity is provided with a pair of positioning grooves adapted to one-to-one insertion of the two side shoulder frames of the upper pole plate.

8. The waterproof electric motor according to claim 7, characterized in that, The inner bottom wall of the receiving cavity is provided with at least one positioning column, and the lower pole plate is provided with at least one positioning hole adapted to one-to-one penetration of the positioning column. ​ 9. A water-resistant electric motor according to claim 7 or 8, characterized in that ​ 10. The waterproof electric motor according to claim 8, wherein, ​ ​ 11. The waterproof electric motor according to claim 8 or 10, characterized by ​ ​ 12. The waterproof electric motor according to claim 8, wherein, ​

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