Protective structure and electric machine

Abstract

The utility model provides a kind of protective structure and motor, the protective structure includes protective cover, protective cover includes the cylinder and end cap being connected with each other, the end cap is set in one end of the cylinder and is enclosed into protective space, first through-hole for the output shaft of the motor is set on the end cap;Waterproof cover is set on the end cap and is located in the side of the end cap away from the cylinder, the waterproof cover and the end cap are enclosed into waterproof space, second through-hole for the output shaft of the motor is set on the waterproof cover, the second through-hole is oppositely set with the first through-hole;Wherein, the protective structure is integrally formed. By the technical scheme provided by the utility model, the technical problem that the combination part of waterproof cover and protective cover is prone to sealing failure due to assembly error or material deformation, and the waterproof effect is difficult to guarantee, can be solved in the prior art that motor protective cover and waterproof cover exist as independent components.

Description

Technical Field

[0001] This utility model relates to the field of protective device technology, and more specifically, to a protective structure and a motor. Background Technology

[0002] Currently, as a core power component, the operating environment of electric motors is becoming increasingly complex, and the requirements for sealing performance are constantly increasing. The mating structure between the motor protective cover (bearing cover) and the waterproof cover is one of the key technologies for ensuring stable operation of the motor in harsh environments. However, in traditional motor sealing designs, the motor protective cover and the waterproof cover often exist as independent components. The joint between the waterproof cover and the protective cover is prone to sealing failure due to assembly errors or material deformation, thus making it difficult to guarantee the waterproof effect. Utility Model Content

[0003] The main purpose of this utility model is to provide a protective structure to solve the technical problem in the prior art that the joint between the waterproof cover and the protective cover is prone to sealing failure due to assembly errors or material deformation, which in turn makes it difficult to guarantee the waterproof effect.

[0004] To achieve the above objectives, according to one aspect of the present invention, a protective structure is provided, comprising:

[0005] The protective cover includes a cylindrical body and an end cap connected to each other. The end cap is disposed at one end of the cylindrical body and forms a protective space. The end cap is provided with a first through hole for the output shaft of the motor to pass through.

[0006] A waterproof cover is provided on the end cap and located on the side of the end cap away from the cylinder body. The waterproof cover and the end cap form a waterproof space. The waterproof cover is provided with a second through hole for the output shaft of the motor to pass through. The second through hole is arranged opposite to the first through hole.

[0007] The protective structure is integrally formed.

[0008] In some embodiments, a breathable membrane is provided in the first through hole, and the breathable membrane is used to fit with the output shaft.

[0009] In some embodiments, the breathable membrane is thermoformed with the end cap.

[0010] In some embodiments, the breathable membrane is bonded to the end cap by adhesive.

[0011] In some embodiments, the breathable membrane is a plastic breathable membrane or a composite material breathable membrane.

[0012] In some embodiments, the protective structure further includes a baffle disposed within the waterproof space. The baffle is spaced apart from the end cap. The baffle has a third through hole opposite to the second through hole. A waterproof ring is disposed within the third through hole and is used to fit against the output shaft.

[0013] In some embodiments, a recess is provided radially along the output shaft, and the waterproof ring is engaged in the recess.

[0014] In some embodiments, the waterproof cover includes an end plate and a side plate connected in sequence. The side plate is an annular plate, and its two ends are respectively connected to the end plate and the end cap. The end plate is provided with a second through hole, and the outer wall surface of the end plate is inclined at a preset angle.

[0015] In some embodiments, the end plate is provided with a water outlet hole that extends through the wall thickness direction of the waterproof cover, and the water outlet hole is spaced apart from the second through hole.

[0016] In some embodiments, the side plate is a tapered plate, and the cross-sectional area enclosed by the tapered plate gradually decreases along the extension direction from the side plate to the end plate.

[0017] In some embodiments, the end plate is provided with a water outlet hole that penetrates the wall thickness direction of the waterproof cover, and the water outlet hole is spaced apart from the second through hole; the side plate is a tapered plate, and the cross-sectional area enclosed by the tapered plate gradually decreases along the extension direction from the side plate to the end plate.

[0018] In some embodiments, the protective structure is integrally molded by injection molding.

[0019] In some embodiments, the protective structure is integrally formed by stamping.

[0020] In some embodiments, the protective structure is made of aluminum alloy, stainless steel, plastic or composite material.

[0021] According to one aspect of the present invention, an electric motor is provided, including the above-described protective structure. The electric motor includes a housing, a motor body, and an output shaft. The motor body is drivenly connected to the output shaft. The motor body is installed inside the housing. The protective structure covers the portion of the output shaft that extends out of the housing and is connected to the housing.

[0022] By applying the technical solution of this utility model, the overall sealing performance of the structure is enhanced and potential leakage points are reduced by designing the protective cover and waterproof cover as a single piece. The single-piece design not only reduces matching and positioning errors during assembly, lowering assembly difficulty, but also reduces the number of parts and maintenance costs. Furthermore, compared to a split design, the single-piece structure has higher structural strength and durability when subjected to external pressure or impact. Further, the end cap on the protective cover has a first through hole, and the waterproof cover has a corresponding second through hole, forming a waterproof space on the outside of the end cap, thus creating a multi-layered sealing barrier. This effectively prevents moisture, dust, and other impurities from entering the motor through the second through hole, improving the motor's protection level. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 A cross-sectional view of a protective structure provided according to an embodiment of the present invention is shown;

[0025] Figure 2 It shows Figure 1 A magnified view of a portion of the image;

[0026] Figure 3 A cross-sectional view of the protective structure provided according to an embodiment of the present invention at the breathable membrane is shown;

[0027] Figure 4 A cross-sectional view of the protective structure provided according to an embodiment of the present invention at the waterproof ring is shown;

[0028] Figure 5 A top view of a protective structure provided according to an embodiment of the present invention is shown;

[0029] Figure 6 A perspective view showing the protective structure and output shaft assembly according to an embodiment of the present invention is shown.

[0030] Figure 7 A cross-sectional view showing the protective structure and output shaft assembly provided according to an embodiment of the present invention is shown;

[0031] Figure 8 A schematic diagram of a protective structure provided according to an embodiment of the present invention is shown, which is disposed on a motor.

[0032] The above figures include the following reference numerals:

[0033] 1. Protective cover; 11. Cylinder body; 12. End cap; 121. First through hole; 13. Cover edge;

[0034] 2. Waterproof cover; 21. Second through hole; 22. End plate; 221. Water outlet; 23. Side plate;

[0035] 3. Breathable membrane;

[0036] 4. Baffle; 41. Third through hole;

[0037] 5. Waterproof ring;

[0038] 10. Protective space; 20. Waterproof space;

[0039] 100, Output shaft; 101, Recessed part; 102, Mounting groove; 200, Housing; 300, Motor body. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] In existing motor sealing solutions, the protective cover and waterproof cover are usually designed independently. This technical solution only sets a separate sealing ring (such as a rubber gasket or O-ring) at the connection between the protective cover and the motor. This is difficult to meet the long-term sealing stability requirements under complex working conditions. Furthermore, since the waterproof cover and the general cover are located outside the protective cover, the joint between the two is prone to sealing failure due to assembly errors or material deformation. As a result, the protective cover often suffers from grease failure or bearing damage due to high temperature, moisture or rainwater penetration.

[0042] The following explanation uses the example of this protective structure being installed in a motor.

[0043] like Figures 1 to 8 As shown, Embodiment 1 of this utility model provides a protective structure, which includes a protective cover 1 and a waterproof cover 2. The protective cover 1 includes a cylindrical body 11 and an end cap 12 connected to each other. The end cap 12 is disposed at one end of the cylindrical body 11 and forms a protective space 10. The end cap 12 is provided with a first through hole 121 for the output shaft 100 of the motor to pass through. The waterproof cover 2 is disposed on the end cap 12 and located on the side of the end cap 12 away from the cylindrical body 11. The waterproof cover 2 and the end cap 12 form a waterproof space 20. The waterproof cover 2 is provided with a second through hole 21 for the output shaft 100 of the motor to pass through. The second through hole 21 is disposed opposite to the first through hole 121. The protective structure is integrally formed.

[0044] The protective structure provided in this application integrates the protective cover 1 and the waterproof cover 2 into a single unit, eliminating the seam between the two independent components and thus enhancing the overall sealing performance of the structure and reducing potential leakage points. The integrated design not only reduces matching and positioning errors during assembly, lowering assembly difficulty, but also reduces the number of parts and maintenance costs. Furthermore, compared to a split design, the integrated structure exhibits higher structural strength and durability when subjected to external pressure or impact. Further, the end cap 12 on the protective cover 1 has a first through hole 121, and the waterproof cover 2 has a corresponding second through hole 21, forming a waterproof space 20 on the outside of the end cap 12. This creates a multi-layered sealing barrier, effectively preventing moisture, dust, and other impurities from entering the motor through the second through hole 21. Especially under harsh environmental conditions, this design improves the motor's protection level. The protective space here is used to accommodate the bearing; by integrating the protective cover 1 and the waterproof cover 2, the protection level for the bearing is also improved.

[0045] Specifically, the protective structure is made of aluminum alloy, stainless steel, plastic, or composite materials. Aluminum alloy significantly reduces the overall weight of the motor without sacrificing necessary structural strength. Stainless steel and certain aluminum alloys possess excellent corrosion resistance, resisting various corrosive media such as acids, alkalis, and salts, which is beneficial for motor operation under harsh conditions such as high temperature, humidity, and salt spray, effectively extending the motor's service life and reducing maintenance frequency. Furthermore, both aluminum alloy and stainless steel have good thermal conductivity, aiding in motor heat dissipation and reducing the risk of motor failure due to overheating. Plastic or composite materials help ensure the dimensional accuracy and surface finish of the protective structure. For example, the protective structure is made of engineering plastics, PC composite materials (polycarbonate with added reinforcing materials such as glass fiber, carbon fiber, or nanoparticles), or ABS composite materials (acrylonitrile-butadiene-styrene with added reinforcing materials such as glass fiber, carbon fiber, or nanoparticles). Furthermore, when using protective structures in household appliances or new energy vehicles, to balance performance and cost, the protective structures are made of engineering plastics or composite materials, such as PP (polypropylene), PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PC composites, or ABS composites. When using protective structures in high-temperature environments, to ensure high-temperature resistance and corrosion resistance, the protective structures are made of aluminum alloys or stainless steel.

[0046] In one embodiment, the protective structure is integrally injection molded; integral injection molding means that the protective structure is formed in a continuous process, which eliminates welded or glued joints between components, thereby improving structural integrity and sealing. It provides high-precision dimensional control and uniform surface quality. The absence of seams or welds in the injection-molded structure allows it to more effectively block moisture and dust in harsh environments, providing a higher level of protection. Generally, when the protective structure is made of plastic or composite materials, it is integrally injection molded.

[0047] In another embodiment, the protective structure is integrally formed by stamping. Stamping, relying on high-precision molds, ensures the consistency of size and shape of each component of the protective structure, guaranteeing precise fit between all protective structures and other motor components. This helps ensure the motor's sealing performance. It should be noted that integral stamping is generally used in the processing of protective structures made of metal or stainless steel. For metal components requiring high precision, stamping ensures structural strength and the flatness of the sealing surface, while also enhancing corrosion resistance.

[0048] Among them, such as Figures 1 to 3 As shown, a breathable membrane 3 is disposed within the first through-hole 121, and the breathable membrane 3 is used to adhere to the output shaft 100. Here, the breathable membrane 3 adheres to the output shaft 100, forming a dynamic sealing layer. Regardless of the thermal expansion and contraction of the motor during operation, the breathable membrane 3 can closely follow the changes in the output shaft 100 to maintain a good sealing state, effectively preventing moisture, dust, and other external contaminants from entering the motor through the gap between the first through-hole 121 and the output shaft 100. Although the breathable membrane 3 adheres tightly to the output shaft 100, it still allows gas to enter and exit the motor through its microporous structure, thereby balancing the air pressure inside and outside the motor. The microporous structure of the breathable membrane 3 generally has a pore size smaller than that of a water molecule, thus effectively blocking moisture from entering while allowing gas to pass freely. This design achieves a good balance between waterproofing and breathability in the motor, helping to improve the motor's protection level.

[0049] It should be noted that the breathable membrane 3 is arranged in a ring shape. It can be selected as a microporous breathable membrane 3. By adjusting the material and porosity of the breathable membrane 3, it can be adapted to different working conditions and environments. For example, in high humidity, dusty or corrosive environments, a membrane material with higher durability and chemical stability can be selected.

[0050] Specifically, the breathable membrane 3 is a plastic breathable membrane or a composite material breathable membrane. Plastic materials possess high chemical stability, maintaining excellent breathability and waterproofing even in extreme environments, effectively preventing moisture, dust, and other harmful substances from entering the motor. Composite material breathable membranes 3 can provide superior physical and chemical properties, such as high corrosion resistance or high strength. When using the protective structure in household appliances (such as household air conditioner motors), microporous breathable membranes made of PP or PVDF materials can be selected to reduce costs. When the protective structure is used in applications requiring higher performance (such as new energy vehicle motors), PTFE materials can be selected to ensure performance.

[0051] In one embodiment, the breathable membrane 3 and the end cap 12 are thermoformed. By bonding the breathable membrane 3 and the end cap 12 under high temperature and pressure, a tight and seamless connection can be formed, ensuring the stability and sealing of the breathable membrane 3 throughout its service life and reducing sealing failure caused by mechanical vibration or environmental changes. Furthermore, the edges of the breathable membrane 3 and the end cap 12 are sealed (e.g., coated with sealant) to prevent liquid from seeping in from the edges of the breathable membrane 3 and the end cap 12.

[0052] In another embodiment, the breathable membrane 3 is bonded to the end cap 12 with adhesive. This provides a durable seal and is particularly suitable for complex shapes or structures that are difficult to thermoform, ensuring there are no gaps between the breathable membrane 3 and the end cap 12 to prevent contaminants from entering. Exemplarily, the breathable membrane 3 is fixed within the first through-hole 121 of the end cap 12 using epoxy resin or polyurethane adhesive.

[0053] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the protective structure also includes a baffle 4, which is disposed within the waterproof space 20. The baffle 4 is spaced apart from the end cap 12. The baffle 4 has a third through hole 41 opposite to the second through hole 21. A waterproof ring 5 is disposed within the third through hole 41, which is used to fit against the output shaft 100. By adding a baffle 4 inside the waterproof space 20, with a third through hole 41 and a waterproof ring 5 inside, a waterproof layer is increased. The waterproof ring 5 forms a tight seal with the output shaft 100, further enhancing the waterproof capability of the output shaft 100. Especially under vibration or displacement during motor operation, it effectively prevents moisture from entering the motor through the gap between the output shaft 100 and the third through hole 41. Furthermore, the waterproof ring 5, disposed between the breathable membrane 3 and the second through hole 21, prevents liquid from directly impacting the breathable membrane 3, thus extending the service life of the breathable membrane 3.

[0054] Furthermore, such as Figure 7As shown, a recess 101 is provided radially along the output shaft 100, and the waterproof ring 5 is engaged in the recess 101. The recess 101 provides a precise positioning and stable fixing position for the waterproof ring 5, ensuring that the position of the waterproof ring 5 remains unchanged during motor operation, avoiding displacement or detachment of the waterproof ring 5 due to vibration or rotation, thereby enhancing the sealing performance at the output shaft 100. For example, the waterproof ring 5 is made of rubber, such as silicone or fluororubber. Due to its high elasticity, when the protective structure is assembled with the output shaft 100, the waterproof ring 5 is compressed and deformed, ensuring a tight fit between the waterproof ring 5 and the output shaft 100 without affecting the assembly effect. The waterproof ring 5 being engaged in the recess 101 ensures that a contact sealing surface is formed between the waterproof ring 5 and the output shaft 100, maintaining a good sealing effect even when the output shaft 100 is under stress or has slight geometric deviations, preventing the intrusion of moisture and impurities. The recessed portion 101 allows the waterproof ring 5 to be embedded more deeply into the shaft, reducing the risk of seal failure due to improper installation or aging deformation of the waterproof ring 5, and further improving the overall waterproof capability and environmental adaptability of the motor. Assembly becomes simpler and faster, requiring no additional tools or complex positioning processes; simply insert the waterproof ring 5 into the recessed portion 101 to complete the assembly, improving production efficiency.

[0055] The waterproof cover 2 serves as the first protective barrier, providing external protection; the baffle 4 and its waterproof ring 5 serve as the second protective barrier; and the end cap 12 and its breathable membrane 3 serve as the third protective barrier. These three elements form a triple-sealed barrier, creating a composite waterproof mechanism with an outer layer of blocking and an inner layer of sealing, significantly improving the reliability of the motor in harsh environments. The baffle 4 and end cap 12, through their own structural support, also enhance the stability of the entire protective structure, preventing deformation or damage caused by external impacts or long-term use.

[0056] Furthermore, the waterproof cover 2 includes an end plate 22 and a side plate 23 connected in sequence. The side plate 23 is an annular plate, and its two ends are respectively connected to the end plate 22 and the end cap 12. The end plate 22 is provided with a second through hole 21, and the outer wall surface of the end plate 22 is inclined at a preset angle. Here, the inclined setting of the outer wall surface of the end plate 22 refers to the direction from the end cap 12 to the end of the waterproof cover 2, where the diameter of the end plate 22 gradually decreases. This inclined setting of the outer wall surface of the end plate 22 helps to reduce air resistance, especially when the motor is running at high speed, which can reduce the impact of wind speed on the waterproof cover 2 and avoid excessive noise or vibration. The inclined outer wall surface of the end plate 22 also helps to reduce the lateral space occupied by the waterproof cover 2, making the entire motor structure more compact and facilitating installation and use in limited spaces. The inclined end plate 22 design also helps to reduce the accumulation of dust or water stains on the surface of the waterproof cover 2, facilitating daily cleaning and maintenance and maintaining the good operating condition of the motor. For example, the output shaft 100 is provided with a mounting groove 102 along the radial direction, and the fan blade retainer is provided in the mounting groove 102. The outer wall of the inclined end plate 22 can avoid the fan blade retainer, thus avoiding interference between the waterproof cover 2 and the fan blade retainer, thereby avoiding the inability to use the waterproof cover 2 to improve the protection level due to insufficient installation space.

[0057] For example, the preset angle here is 30°, 45° or 60°.

[0058] Furthermore, the side plate 23 is a tapered plate, and the cross-sectional area enclosed by the tapered plate gradually decreases along the extension direction from the side plate 23 to the end plate 22. The streamlined design of the tapered plate reduces air resistance, which is especially important for the motor during high-speed rotation, reducing noise levels and energy consumption. As the cross-sectional area of ​​the side plate 23 decreases along its extension direction, it better adapts to the compact space of the motor, reduces interference of the waterproof cover 2 with other internal components of the motor, and facilitates the assembly and maintenance of the motor.

[0059] The end plate 22 is provided with a water outlet 221 that extends through the wall thickness of the waterproof cover 2, and the water outlet 221 is spaced apart from the second through hole 21. The water outlet 221 on the end plate 22 can effectively drain any water that may accumulate inside the waterproof cover 2. Even if the waterproof cover 2 has a poor seal or experiences minor leakage, the water can be quickly drained through the water outlet 221, preventing water from stagnating inside the motor and protecting motor components from damage due to moisture. The spaced arrangement of the water outlet 221 and the second through hole 21 ensures that drainage does not affect the sealing effect of the waterproof cover 2 on the output shaft 100. This design prevents water flowing from the water outlet 221 from directly passing through the output shaft 100 area, reducing the risk of water entering the motor.

[0060] Furthermore, such as Figure 1 and Figure 8 As shown, one end of the cylinder 11 is provided with an end cap 12, and the other end of the cylinder 11 is provided with a cover edge 13. The cover edge 13 extends outward along the end of the cylinder 11 and is used to install the protective structure inside the motor. The cover edge 13 can be used to ensure the reliability of the installation of the protective structure and the motor.

[0061] It should be noted that the protective structure has passed IP67 / IP68 level tests (such as immersion tests and airtightness tests) to verify its structural reliability. The breathable membrane 3 of this protective structure has passed testing, and the performance stability of the microporous breathable membrane 3 under high temperature, vibration, and humidity changes was checked after the test.

[0062] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0063] The protective structure provided in this application integrates the protective cover 1 and the waterproof cover 2 into a single unit, eliminating the seam between the two independent components and thus enhancing the overall sealing performance of the structure and reducing potential leakage points. The integrated design not only reduces matching and positioning errors during assembly, lowering assembly difficulty, but also reduces the number of parts and maintenance costs. Furthermore, compared to a split design, the integrated structure exhibits higher structural strength and durability when subjected to external pressure or impact. Further, the end cap 12 on the protective cover 1 has a first through hole 121, and the waterproof cover 2 has a corresponding second through hole 21, forming a waterproof space 20 on the outside of the end cap 12. This creates a multi-layered sealing barrier, effectively preventing moisture, dust, and other impurities from entering the motor through the second through hole 21. Especially under harsh environmental conditions, this design improves the motor's protection level.

[0064] The second embodiment of this utility model provides a motor including the above-mentioned protective structure. The motor includes a housing 200, a motor body 300 and an output shaft 100. The motor body 300 is drivenly connected to the output shaft 100. The motor body 300 is installed inside the housing 200. The protective structure covers the part of the output shaft 100 that extends out of the housing 200 and is connected to the housing 200.

[0065] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0067] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0068] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0069] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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.

Claims

1. A protective structure, characterized in that, The protective structure includes: The protective cover (1) includes a cylindrical body (11) and an end cap (12) connected to each other. The end cap (12) is located at one end of the cylindrical body (11) and forms a protective space (10). The end cap (12) is provided with a first through hole (121) for the output shaft (100) of the motor to pass through. A waterproof cover (2) is provided on the end cap (12) and located on the side of the end cap (12) away from the cylinder (11). The waterproof cover (2) and the end cap (12) form a waterproof space (20). A second through hole (21) for the output shaft (100) of the motor is provided on the waterproof cover (2). The second through hole (21) is opposite to the first through hole (121). The protective structure is integrally formed.

2. The protective structure according to claim 1, characterized in that, A breathable membrane (3) is provided inside the first through hole (121), and the breathable membrane (3) is used to fit with the output shaft (100).

3. The protective structure according to claim 2, characterized in that, The breathable membrane (3) and the end cap (12) are heat-pressed together; or, The breathable membrane (3) is bonded to the end cap (12) with adhesive; or, The breathable membrane (3) is a plastic breathable membrane or a composite material breathable membrane.

4. The protective structure according to claim 1, characterized in that, The protective structure also includes: A baffle (4) is provided in the waterproof space (20). The baffle (4) is spaced apart from the end cap (12). The baffle (4) is provided with a third through hole (41) opposite to the second through hole (21). A waterproof ring (5) is provided in the third through hole (41). The waterproof ring (5) is used to fit with the output shaft (100).

5. The protective structure according to claim 4, characterized in that, A recess (101) is provided radially along the output shaft (100), and the waterproof ring (5) is engaged in the recess (101).

6. The protective structure according to claim 1, characterized in that, The waterproof cover (2) includes an end plate (22) and a side plate (23) connected in sequence. The side plate (23) is an annular plate. The two ends of the side plate (23) are connected to the end plate (22) and the end cap (12) respectively. The end plate (22) is provided with a second through hole (21). The outer wall surface of the end plate (22) is inclined at a preset angle.

7. The protective structure according to claim 6, characterized in that, The end plate (22) is provided with a water outlet (221) penetrating the wall thickness direction of the waterproof cover (2), and the water outlet (221) is spaced apart from the second through hole (21); and / or, The side plate (23) is a tapered plate, and the cross-sectional area enclosed by the tapered plate gradually decreases along the extension direction from the side plate (23) to the end plate (22).

8. The protective structure according to claim 1, characterized in that, The protective structure is integrally formed by injection molding; or, the protective structure is integrally formed by stamping.

9. The protective structure according to claim 1, characterized in that, The protective structure is made of aluminum alloy, stainless steel, plastic or composite material.

10. An electric motor, characterized in that, The motor includes the protective structure described in any one of claims 1-9, comprising a housing (200), a motor body (300), and an output shaft (100), wherein the motor body (300) is drivenly connected to the output shaft (100), the motor body (300) is installed inside the housing (200), and the protective structure covers the portion of the output shaft (100) that extends out of the housing (200) and is connected to the housing (200).

Images