End cover waterproof structure and motor
The design of the waterproof end cap structure solves the problem of insufficient sealing of the hub motor, improves the waterproof performance of the motor and extends its service life, thus ensuring the safety and stability of electric vehicles and other new energy vehicles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-04-03
AI Technical Summary
Existing hub motors suffer from insufficient sealing due to gaps between the housing and end caps, leading to internal damage and reduced lifespan.
The end cap waterproof structure includes a base, end cap, outer shell, and seals. Through the design of connectors, sealing grooves, and sealing steps, a solid basic frame and sealing ring groove are formed to enhance the sealing effect between the end cap and the outer shell.
It effectively isolates external moisture and impurities, prevents internal motor components from getting damp or contaminated, extends motor lifespan, and improves equipment protection level and operational stability, especially the safety and driving stability of hub motors.
Smart Images
Figure CN224083306U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power motor technology, and in particular to a waterproof end cap structure and a motor. Background Technology
[0002] Electric motors, as devices that convert electrical energy into mechanical energy (or vice versa), play a vital role in modern industry and daily life. From a professional perspective, electric motors primarily operate based on the principle of electromagnetic induction, and their core components typically include a stator, rotor, and electromagnetic windings. In an electric motor, the stator, as the stationary part, is usually equipped with electromagnetic windings to generate a rotating magnetic field. The rotor, as the rotating part, rotates due to the force exerted by the rotating magnetic field through electromagnetic induction, thereby converting electrical energy into mechanical energy. Furthermore, electric motors come in various types to adapt to different application scenarios.
[0003] Hub motors are power components used in mobility devices such as electric vehicles, electric cars, and wheeled robots. They primarily use an external rotor as the power output to achieve propulsion. However, existing hub motors suffer from insufficient sealing due to gaps between the housing and end caps. This can easily lead to internal damage and shorten the motor's lifespan. Utility Model Content
[0004] To solve the above problems, this utility model provides a waterproof end cap structure and motor that effectively isolates moisture and impurities from the external environment, preventing performance degradation or even malfunction of internal motor components due to moisture or contamination, thereby greatly extending the service life of the motor.
[0005] The technical solution adopted by this utility model is as follows: a waterproof end cap structure, including a base, an end cap, and a shell. The base is provided with a connector, one end of which is connected to the shell. The shell is provided with a side wall, and the side wall is provided with a connecting part. The connecting part is provided with a connecting groove and a first sealing groove. The inner diameter of the end cap is provided with an inner diameter sealing step, and the outer diameter is provided with an outer diameter sealing step. The inner diameter sealing step is provided with a sealing element, and the inner diameter sealing step is sealed and abuts against the base through the sealing element. The outer diameter sealing step is provided with a connecting buckle and a second sealing groove. The connecting buckle is used to fasten onto the connecting groove. The second sealing groove is opposite to the first sealing groove to form a sealing ring groove, and a sealing ring is provided in the sealing ring groove.
[0006] A further improvement to the above scheme is that a rotating mounting cavity is provided inside the base, a bearing is provided in the rotating mounting cavity, one end of the connector is mounted on the bearing, and the other end is fixedly connected to the outer shell.
[0007] A further improvement to the above solution is that an installation part is provided at the port of the base, and a sealing wall is provided on the lower side of the installation part, and the inner diameter of the sealing element is sealed and abutted against the sealing wall.
[0008] A further improvement to the above solution is that the sealing element includes a sealing mounting ring, a sealing telescopic cavity, and a sealing abutment strip. The outer diameter of the sealing mounting ring is provided with a sealing outer lip. The sealing telescopic cavity is disposed inside the sealing mounting ring. One end of the sealing abutment strip is disposed in the sealing mounting ring, and the other end extends toward the sealing wall surface and abuts against the sealing wall surface.
[0009] A further improvement to the above scheme is that the inner diameter sealing step is provided with a contact wall surface, and the sealing outer lip is in sealing contact with the contact wall surface.
[0010] A further improvement to the above solution is that a reinforcing inclined surface is provided on the side of the outer diameter sealing step facing the inner diameter sealing step; and a snap-fit inclined surface is provided on the connecting buckle.
[0011] A further improvement to the above solution is that a first arc-shaped chamfer is provided at the opening of the first sealing groove, and a second arc-shaped chamfer is provided at the port of the connecting part.
[0012] An electric motor includes the aforementioned waterproof end cap structure. The electric motor includes a stator assembly and a rotor assembly. The stator assembly is disposed on a base, and the rotor assembly is disposed on the inner wall of a housing. The stator assembly and the rotor assembly are opposite to each other.
[0013] A further improvement to the above solution is that the outer shell is provided with a sealed cavity, a rotor support is provided in the sealed cavity, the rotor assembly is composed of multiple rotor magnets, multiple rotor fixing slots are provided on the rotor support, and multiple rotor magnets are correspondingly arranged on the multiple rotor fixing slots.
[0014] A further improvement to the above scheme is that the stator assembly includes a stator support and a coil winding, the stator support is provided with multiple winding arms, and the coil winding is disposed on the winding arms.
[0015] The beneficial effects of this utility model are:
[0016] Compared to existing motor structures, this invention constructs a robust basic framework through a stable connection between the base and the outer casing via connectors. The connecting portion on the side wall of the outer casing features a connecting slot and a first sealing groove, providing a connection platform for the installation and sealing of the end cap. The sealing step on the inner diameter of the end cap, in conjunction with the sealing element, achieves a tight fit with the base, effectively preventing moisture penetration from the inside. Furthermore, the connecting buckle and the second sealing groove on the outer diameter sealing step further enhance the sealing effect between the end cap and the outer casing. In particular, when the connecting buckle is accurately engaged in the connecting slot, the gap between the two is greatly reduced, forming a waterproof barrier in conjunction with the sealing ring in the sealing ring groove.
[0017] The advantages of applying the aforementioned waterproof end cap structure to motors or hub motors are particularly evident. As the core of the power system, the motor's internal electronic components are extremely sensitive to moisture; water ingress can lead to serious consequences such as short circuits and corrosion. Hub motors, as key components of electric vehicles and other new energy transportation tools, have their waterproof performance directly affecting vehicle safety and driving stability. Therefore, this waterproof structure not only improves the overall protection level of the equipment but also provides strong support for its stable operation in various harsh environments.
[0018] The motor is securely mounted on the base via the stator assembly, ensuring stability and precision during operation. The rotor assembly is cleverly positioned within the housing, precisely aligned with the stator assembly. This layout not only optimizes the electromagnetic field distribution but also improves energy conversion efficiency. The introduction of a waterproof end cap structure effectively isolates the motor from moisture and impurities in the external environment, preventing performance degradation and even malfunctions caused by moisture or contamination of internal components, thus significantly extending the motor's lifespan. As a core component of electric vehicles and other new energy transportation tools, hub motors have extremely high requirements for waterproofing and durability. The waterproof end cap design opens up new avenues for performance optimization and reliability improvement in hub motors. Attached Figure Description
[0019] Figure 1 This is a three-dimensional schematic diagram of the motor of this utility model;
[0020] Figure 2 for Figure 1 A top view of the motor.
[0021] Figure 3 for Figure 2 Sectional view of AA;
[0022] Figure 4 for Figure 3 Enlarged diagram of point A in the diagram;
[0023] Figure 5 for Figure 3Enlarged diagram of point B in the image.
[0024] Explanation of reference numerals in the attached drawings: Base 1, Rotary mounting cavity 11, Bearing 12, Mounting part 13, End cover 2, Inner diameter sealing step 21, Outer diameter sealing step 22, Connecting buckle 221, Second sealing groove 222, Sealing ring groove 223, Reinforcing bevel 224, Buckle bevel 225, Sealing element 23, Sealing mounting ring 231, Sealing telescopic cavity 232, Sealing abutment strip 233, Sealing outer lip 234, Outer shell 3, Side wall 31, Connecting part 32, Connecting groove 321, First sealing groove 322, First arc chamfer 323, Second arc chamfer 324, Rotor bracket 33, Connecting element 4, Stator assembly 5, Stator bracket 51, Winding arm 511, Coil winding 52, Rotor assembly 6, Rotor magnet 61. Detailed Implementation
[0025] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Figures 1-5As shown, in one embodiment of this utility model, a waterproof end cap structure is provided, including a base 1, an end cap 2, and a shell 3. The base 1 is provided with a connector 4, one end of which is connected to the shell 3. The shell 3 is provided with a side wall 31, and the side wall 31 is provided with a connecting part 32. The connecting part 32 is provided with a connecting groove 321 and a first sealing groove 322. The inner diameter of the end cap 2 is provided with an inner diameter sealing step 21, and the outer diameter is provided with an outer diameter sealing step 22. The inner diameter sealing step 21 is provided with a sealing element 23, and the inner diameter sealing step 21 is sealed and abuts against the base 1 through the sealing element 23. The outer diameter sealing step 22 is provided with a connecting buckle 221 and a second sealing groove 222. The connecting buckle 221 is used to fasten onto the connecting groove 321. The second sealing groove 222 is opposite to the first sealing groove 322 to form a sealing ring groove 223, and a sealing ring is provided in the sealing ring groove 223. In this embodiment, a solid foundation frame is constructed by the stable connection between the base 1 and the outer shell 3 through the connector 4. The connecting part 32 on the side wall 31 of the outer shell 3 is provided with a connecting groove 321 and a first sealing groove 322, providing a connection platform for the installation and sealing of the end cap 2. The sealing step on the inner diameter of the end cap 2 and the cooperation with the sealing element 23 achieve a tight fit with the base 1, effectively preventing moisture from penetrating from the inside. The connecting buckle 221 and the second sealing groove 222 on the outer diameter sealing step 22 further enhance the sealing effect between the end cap 2 and the outer shell 3. In particular, when the connecting buckle 221 is accurately engaged in the connecting groove 321, the gap between the two is greatly reduced, forming a waterproof barrier in conjunction with the sealing ring in the sealing ring groove 223.
[0028] Applying the aforementioned waterproof end cap 2 structure to motors or hub motors offers significant advantages. As the core of the power system, the motor's internal electronic components are extremely sensitive to moisture; water ingress can lead to serious consequences such as short circuits and corrosion. Hub motors, as key components of electric vehicles and other new energy transportation tools, directly impact vehicle safety and driving stability with their waterproof performance. Therefore, this waterproof structure not only enhances the overall protection level of the equipment but also provides strong support for its stable operation in various harsh environments.
[0029] A rotating mounting cavity 11 is provided within the base 1, and a bearing 12 is provided in the rotating mounting cavity 11. One end of the connector 4 is mounted on the bearing 12, and the other end is fixedly connected to the outer shell 3. In this embodiment, by supporting one end of the connector 4 with the bearing 12, the connector 4 can rotate smoothly relative to the base 1, effectively improving the stability and durability of the motor end cover 2 in dynamic working environments. At the same time, the use of the bearing 12 greatly reduces rotational friction, lowers energy loss, and helps improve the overall operating efficiency of the motor. The other end of the connector 4 is fixedly connected to the outer shell 3. This design ensures a tight connection between the motor end cover 2 and the outer shell 3, effectively preventing moisture and other harmful external substances from entering the motor, thereby enhancing the motor's waterproof performance. Furthermore, to further enhance the sealing performance, sealing components such as sealing rings can be provided at the connection position between the connector 4 and the outer shell 3 to further ensure the structural sealing.
[0030] A mounting portion 13 is provided at the port of the base 1, and a sealing wall is provided on the lower side of the mounting portion 13. The inner diameter of the sealing element 23 is in sealing contact with the sealing wall. In this embodiment, the tight fit between the mounting portion 13 and the sealing wall creates a solid waterproof barrier for the motor end cover 2. The sealing contact between the inner diameter of the sealing element 23 and the sealing wall effectively prevents moisture from seeping into the motor from the port of the base 1, thereby ensuring the normal operation and long-term stability of the motor. In addition, this structure also has good adaptability and reliability. The material and size of the sealing element 23 and the sealing wall are carefully designed and selected to withstand vibration and temperature changes during motor operation and maintain stable sealing performance. At the same time, the mounting portion 13 facilitates the installation and removal of the sealing element 23, providing convenience for the maintenance and upkeep of the motor.
[0031] The sealing element 23 includes a sealing mounting ring 231, a sealing telescopic cavity 232, and a sealing abutment strip 233. The sealing mounting ring 231 has a sealing outer lip 234 on its outer diameter. The sealing telescopic cavity 232 is located inside the sealing mounting ring 231. One end of the sealing abutment strip 233 is located on the sealing mounting ring 231, and the other end extends towards and abuts against the sealing wall surface. In this embodiment, the sealing mounting ring 231, through its sealing outer lip 234 on its outer diameter, achieves a tight fit with the mounting hole of the motor end cover 2, effectively preventing moisture from seeping through the installation gap. The sealing telescopic cavity 232 provides the sealing element 23 with a certain degree of elasticity and adaptability, enabling it to automatically adjust its sealing state during motor operation in response to temperature changes and mechanical vibrations, ensuring long-term stable waterproof performance. Furthermore, the design of the sealing abutment strip 233 is particularly noteworthy. One end is firmly connected to the sealing mounting ring 231, while the other end faces and tightly abuts against the sealing wall surface, forming a solid waterproof barrier. This structure not only greatly enhances the sealing effect, but also improves the adaptability of the seal 23 to the unevenness of the sealing wall surface, ensuring reliable waterproof sealing under various working conditions.
[0032] The inner diameter sealing step 21 is provided with a contact wall surface, and the sealing outer lip 234 seals against the contact wall surface. In this embodiment, the tight fit between the sealing outer lip 234 and the contact wall surface effectively prevents the intrusion of external moisture and humidity, thereby protecting the internal components of the motor from corrosion and damage and extending the service life of the motor. Secondly, this structure also has good sealing stability and reliability. The design of the contact wall surface allows the sealing outer lip 234 to be evenly distributed under pressure, avoiding excessive local stress and ensuring the durability of the sealing effect.
[0033] A reinforcing bevel 224 is provided on the side of the outer diameter sealing step 22 facing the inner diameter sealing step 21; the connecting buckle 221 is provided with a buckling bevel 225. In this embodiment, the reinforcing bevel 224 strengthens the connection between the outer diameter sealing step 22 and the end cap 2, improving structural rigidity. The buckling bevel 225 on the connecting buckle 221 facilitates quick and secure connection between the buckle and the end cap 2 or other components. This simplifies the assembly process, improves production efficiency, and ensures the reliability and durability of the waterproof structure.
[0034] The first sealing groove 322 has a first arc-shaped chamfer 323 at its opening, and the connecting part 32 has a second arc-shaped chamfer 324 at its port. In this embodiment, the first arc-shaped chamfer 323 and the second arc-shaped chamfer 324 facilitate structural assembly and also prevent sharp angles from cutting the sealing ring.
[0035] An electric motor includes the aforementioned waterproof end cap 2 structure. The motor comprises a stator assembly 5 and a rotor assembly 6. The stator assembly 5 is mounted on a base 1, and the rotor assembly 6 is mounted on the inner wall of a housing 3, with the stator assembly 5 and rotor assembly 6 facing each other. In this embodiment, the motor is securely mounted on the base 1 via the stator assembly 5, ensuring the stability and accuracy of the motor during operation. The rotor assembly 6 is cleverly positioned on the inner wall of the housing 3, forming a precise alignment with the stator assembly 5. This layout not only optimizes the distribution of the electromagnetic field but also promotes the improvement of energy conversion efficiency. The introduction of the waterproof end cap 2 structure effectively isolates moisture and impurities from the external environment, preventing performance degradation or even failure of internal motor components due to moisture or contamination, thereby greatly extending the service life of the motor. As a core component of electric vehicles and other new energy transportation tools, hub motors have extremely high requirements for waterproofing and durability. The design of the waterproof end cap 2 structure opens up a new path for performance optimization and reliability improvement of hub motors.
[0036] The outer casing 3 is provided with a sealed cavity, within which a rotor support 33 is housed. The rotor assembly 6 is composed of multiple rotor magnets 61. The rotor support 33 has multiple rotor fixing slots, and the multiple rotor magnets 61 are correspondingly mounted on these slots. In this embodiment, the sealed cavity design effectively isolates the external environment from interference with the internal components of the motor, improving the motor's operational stability and durability. The rotor support 33, as a key support structure, has multiple rotor fixing slots that precisely position and securely mount the multiple rotor magnets 61, ensuring the balance and reliability of the rotor assembly 6 during high-speed rotation. Furthermore, the rotor assembly 6, composed of multiple rotor magnets 61, not only enhances the motor's magnetic properties but also improves its torque output and efficiency. The precise layout of the rotor magnets 61 in the rotor fixing slots optimizes the magnetic field distribution, reduces energy loss, and thus achieves high-efficiency motor performance.
[0037] The stator assembly 5 includes a stator support 51 and a coil winding 52. The stator support 51 is provided with multiple winding arms 511, and the coil winding 52 is disposed on the winding arms 511. In this embodiment, the stator support 51 serves as the core support structure. Through the carefully designed multiple winding arms 511, it not only ensures the stable and precise positioning of the coil winding 52 but also optimizes the spatial layout of the winding, improving the overall structural compactness of the motor. The coil winding 52 is tightly fitted onto the winding arms 511, which greatly improves current conduction efficiency and reduces energy loss. At the same time, the reasonable winding layout helps to enhance the uniformity of the electromagnetic field, thereby improving the smoothness and efficiency of the motor's operation. In addition, the structural design of this stator assembly 6 facilitates coil heat dissipation and maintenance. The spacing design of the winding arms 511 promotes air circulation, effectively reducing the operating temperature of the coil and extending the service life of the motor. The modular nature of the assembly also makes the replacement or repair of the coil winding 52 simpler and faster, reducing maintenance costs.
[0038] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A waterproof end cap structure, characterized in that: The device includes a base, an end cap, and a housing. The base is provided with a connector, one end of which is connected to the housing. The housing has a sidewall with a connecting portion. The connecting portion has a connecting groove and a first sealing groove. The end cap has an inner diameter sealing step and an outer diameter sealing step. The inner diameter sealing step has a sealing element that seals against the base. The outer diameter sealing step has a connecting buckle and a second sealing groove. The connecting buckle is used to engage with the connecting groove. The second sealing groove is opposite to the first sealing groove to form a sealing ring groove, and a sealing ring is disposed in the sealing ring groove.
2. The waterproof end cap structure according to claim 1, characterized in that: The base is provided with a rotating cavity, and the rotating cavity is provided with a bearing. One end of the connector is mounted on the bearing, and the other end is fixedly connected to the outer shell.
3. The waterproof end cap structure according to claim 1, characterized in that: The base has a mounting part at its port, and a sealing wall is provided on the lower side of the mounting part. The inner diameter of the sealing element is in sealing contact with the sealing wall.
4. The waterproof end cap structure according to claim 3, characterized in that: The sealing element includes a sealing mounting ring, a sealing telescopic cavity, and a sealing abutment strip. The outer diameter of the sealing mounting ring is provided with a sealing outer lip. The sealing telescopic cavity is disposed inside the sealing mounting ring. One end of the sealing abutment strip is disposed in the sealing mounting ring, and the other end extends toward the sealing wall and abuts against the sealing wall.
5. The waterproof end cap structure according to claim 4, characterized in that: The inner diameter sealing step is provided with a contact wall surface, and the sealing outer lip is in sealing contact with the contact wall surface.
6. The waterproof end cap structure according to claim 1, characterized in that: The outer diameter sealing step has a reinforcing slope on the side facing the inner diameter sealing step; the connecting buckle has a buckle slope.
7. The waterproof end cap structure according to claim 1, characterized in that: The first sealing groove has a first arc-shaped chamfer at its opening, and the connecting part has a second arc-shaped chamfer at its port.
8. An electric motor, characterized in that: The motor includes the waterproof end cap structure according to any one of claims 1 to 7, wherein the motor includes a stator assembly and a rotor assembly, the stator assembly is disposed on a base, the rotor assembly is disposed on the inner wall of the housing, and the stator assembly and the rotor assembly are opposite to each other.
9. The motor according to claim 8, characterized in that: The outer shell is provided with a sealed cavity, and a rotor support is provided in the sealed cavity. The rotor assembly is composed of multiple rotor magnets, and multiple rotor fixing slots are provided on the rotor support. The multiple rotor magnets are correspondingly arranged on the multiple rotor fixing slots.
10. The motor according to claim 8, characterized in that: The stator assembly includes a stator support and a coil winding. The stator support is provided with multiple winding arms, and the coil winding is disposed on the winding arms.