Planetary reducer and gear motor

Abstract

The utility model discloses a planetary reducer and speed reduction motor, relates to transmission device technical field, the planetary reducer includes casing, planet gear mechanism and output cover, the planet gear mechanism is provided in the casing, output cover is provided with inner gear ring, output cover passes through the inner gear ring and is engaged with planet gear mechanism, output cover passes through the inner gear ring. A waterproof structure is further arranged between the output machine cover and the machine shell. When the planetary reducer is applied to a gear motor, the power unit can directly establish a transmission relationship with the planetary gear mechanism, so that the planetary gear mechanism directly drives the output cover to rotate, and the planetary reducer is simpler and more compact in structure compared with a common reducer on the basis of ensuring that the planetary reducer has higher bearing capacity. And a waterproof structure is further arranged between the output machine cover and the machine shell, so that a movable gap between the output machine cover and the machine shell can be protected, and the stability of the electric wheelchair is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of transmission devices, and in particular to a planetary reducer and a geared motor. Background Technology

[0002] Electric wheelchairs are upgraded versions of traditional manual wheelchairs by adding power drive devices, control devices, batteries, and other components. They are mainly powered by batteries, and the control devices control the power drive devices to rotate the wheels, thus enabling the overall movement of the electric wheelchair.

[0003] One of the core technologies of electric wheelchairs is the drive unit. The drive unit achieves deceleration and torque increase by connecting the wheelchair to the reducer. As one of the many types of reducers, the planetary reducer achieves transmission through a planetary gear mechanism system. It has the characteristics of small size and light weight, making it very suitable for use in space-constrained devices such as electric wheelchairs.

[0004] However, due to the complex and diverse usage scenarios of electric wheelchairs, there is a risk of contact with water or moisture in different usage scenarios. Furthermore, the drive unit of an electric wheelchair is located relatively close to the ground. Therefore, when an electric wheelchair comes into contact with water or moisture during use, moisture can enter the drive unit through the planetary reducer, causing damage and malfunction of the internal mechanical structure and electrical components. This not only reduces the reliability and durability of the product, but may also pose a threat to the user's safety and affect the user experience. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a planetary reducer and a geared motor, which can solve the above-mentioned problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, a planetary speed reducer is provided, comprising:

[0008] chassis;

[0009] The planetary gear mechanism is housed within the housing.

[0010] The output cover is provided with an internal gear ring, which meshes with the planetary gear mechanism through the internal gear ring. A waterproof structure is also provided between the output cover and the housing.

[0011] In practical applications of geared motors, the power unit can directly drive the output cover to output power through the planetary gear mechanism. This reduces the number of components and materials inside the planetary reducer while ensuring its high torque output. Furthermore, by incorporating a waterproof structure between the housing and the output cover, the electric wheelchair can adapt to a wider range of complex and diverse usage environments, preventing moisture from entering the planetary reducer and even the power unit through the gap between them.

[0012] As an optional implementation, the waterproof structure includes:

[0013] The first mating part is formed on the outer periphery of the housing;

[0014] The second mating part is disposed on the outer edge of the output cover. The housing is fitted with the output cover through the first mating part and the second mating part with a clearance. A waterproof gap is formed between the first mating part and the second mating part.

[0015] The waterproof gap is formed by the direct fit between the housing and the output cover, which improves the waterproof performance of the planetary reducer while ensuring its excellent structural compactness.

[0016] As an optional implementation, the side of the housing near the output cover is configured as a cylindrical structure, and the outer cylindrical wall of the housing near the output cover forms the first mating part;

[0017] The second mating part is configured as a folded edge structure surrounding the outer edge of the output cover. The output cover is located at one end of the housing opposite to its first side. The folded edge structure bends toward the housing and extends along the outer cylindrical wall of the second side of the housing.

[0018] The waterproof gap is horizontally positioned at the port connecting to the outside of the planetary reducer, reducing the possibility of external moisture dripping directly into the waterproof gap from the outside of the planetary reducer and improving the waterproof performance of the planetary reducer.

[0019] As an optional implementation, the waterproof structure further includes a water storage cavity formed between the housing and the output cover, the water storage cavity being disposed around the housing and the output cover;

[0020] The outer periphery of the water storage cavity is connected to the external environment through the waterproof gap.

[0021] As a second waterproof structure based on the waterproof gap, it can store water from the waterproof gap, preventing water from directly entering the equipment through the waterproof gap. By setting the waterproof gap on the outer periphery of the water storage cavity, it is easy for the water inside the water storage cavity to be discharged through the waterproof gap, thereby improving the waterproof capability of the water storage cavity.

[0022] As an optional implementation, a hollow mounting cavity is formed inside the housing, and a mounting port communicating with the mounting cavity is also provided at one end of the housing near the output cover.

[0023] The output cover is disposed in the mounting cavity through the mounting port. The output cover is provided with a first cavity wall inside the mounting cavity, and the output cover is provided with a second cavity wall outside the mounting cavity. The first cavity wall, the second cavity wall, and the inner wall of the mounting cavity cooperate to form the water storage cavity. The second cavity wall and the outer wall of the mounting cavity are fitted together to form the waterproof gap.

[0024] This ensures that the water storage chamber and the waterproof gap are formed directly through the structural fit between the housing and the output cover. No additional components are needed between the housing and the output cover to form the waterproof structure, ensuring that the planetary reducer maintains good structural compactness even after the waterproof structure is added.

[0025] As an optional implementation, the first mating part is provided with a drain hole communicating with the water storage chamber; or

[0026] The first mating part and the second mating part are provided with interconnected drainage holes. One end of the drainage hole is connected to the water storage cavity, and the other end of the drainage hole is connected to the external environment of the planetary reducer.

[0027] As an optional implementation, a drainage channel is provided inside the output cover. One end of the drainage channel is connected to the water storage chamber, and the other end of the drainage channel is connected to the external environment through the side of the output cover away from the housing.

[0028] As an optional implementation, a first bearing is provided between the housing and the output cover, the outer ring of the first bearing is fixed to the inner wall of the mounting cavity, and the inner ring of the first bearing is fixed to the outer wall of the output cover;

[0029] The first cavity wall extends toward the inner wall of the mounting cavity and is located between the first bearing and the water storage cavity.

[0030] The water storage cavity, which serves as a second layer of waterproofing, is used to isolate the first bearing, preventing moisture from easily contacting it.

[0031] As an optional implementation, the mounting cavity includes a first wall panel and a second wall panel, the first wall panel and the second wall panel being sequentially connected from the mounting cavity away from the mounting opening toward the mounting opening and surrounding the outer periphery of the mounting cavity, and a stepped structure being formed between the first wall panel and the second wall panel;

[0032] The outer ring of the first bearing is fixedly connected to the second wall plate and abuts against the stepped structure; the inner ring of the first bearing is fixedly connected to the outer wall of the output cover and abuts against the second wall plate.

[0033] By using the stepped structure formed by the housing and the partial water storage cavity structure in the output cover to constrain the first bearing, the stability of the first bearing (output cover) is improved while ensuring the compactness of the planetary reducer structure, thus avoiding the need for further limiting structures between the housing and the output cover.

[0034] As an optional implementation, the waterproof structure further includes an adhesive-receiving groove disposed on the inner wall of the mounting cavity, the adhesive-receiving groove being located between the inner wall of the mounting cavity and the outer ring of the first bearing; and

[0035] Sealant is applied between the inner wall of the mounting cavity and the outer ring of the first bearing.

[0036] As the third layer of waterproof structure, the sealant forms a waterproof barrier between the housing and the first bearing, completely eliminating the possibility of moisture entering the planetary reducer from between the housing and the output end cover.

[0037] As an optional implementation, a fixing bracket is also provided between the housing and the output cover. The first end of the fixing bracket is fixedly installed on the side of the housing near the output cover, and the second end of the fixing bracket rotatably protrudes from the output cover through a second bearing and is provided with a limiting member for constraining the second bearing.

[0038] The planetary gear mechanism is mounted on the housing and the fixed bracket at opposite ends.

[0039] The stability of the output cover and planetary gear mechanism is further improved with the cooperation of the housing and fixed bracket, ensuring the normal operation of the planetary reducer and reducing the frequency of inspection and maintenance.

[0040] Secondly, a geared motor is provided, comprising:

[0041] As described in the first aspect, the planetary reducer;

[0042] The power unit is fixedly installed on the side of the housing away from the output cover by a fixing part, and the drive part of the power unit is engaged with the planetary gear mechanism through the through hole.

[0043] The beneficial effects of this utility model are as follows: In the application of geared motors, the planetary reducer provides corresponding installation positions for the power unit and the planetary gear mechanism through the housing, thereby allowing the power unit to directly establish a transmission relationship with the planetary gear mechanism. The planetary gear mechanism directly drives the output cover to rotate, forming an inner and outer planetary reducer structure. While ensuring that the planetary reducer has a high load-bearing capacity, its structure is simpler and more compact than that of ordinary reducers. It also ensures the coaxial transmission of the input and drive parts, effectively reducing the number of components and materials between the power unit and the electric wheelchair, as well as the installation space occupied by the geared motor on the electric wheelchair, thus meeting the performance and appearance requirements of electric wheelchairs.

[0044] By incorporating a waterproof structure between the output cover and the housing, the movement gap between them can be protected, allowing the electric wheelchair to adapt to a wider range of complex and diverse usage environments. This prevents moisture from entering the planetary reducer and even the power unit through the gap, thus avoiding damage to the internal mechanical structure of the planetary reducer and electrical components such as the power unit. This extends their service life, reduces the frequency of maintenance and replacement, improves the safety performance of the equipment, and ensures the overall performance of the geared motor, thereby enhancing the stability of the electric wheelchair. Attached Figure Description

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0046] Figure 1 This is one of the schematic diagrams of the overall structure of the planetary reducer described in this embodiment of the utility model;

[0047] Figure 2 This is a disassembly diagram of the planetary reducer structure described in this embodiment of the utility model;

[0048] Figure 3 This is one of the cross-sectional views of the planetary reducer described in the embodiments of this utility model;

[0049] Figure 4 for Figure 1 Enlarged view of part A;

[0050] Figure 5 This is a second cross-sectional view of the planetary reducer described in this embodiment of the present invention;

[0051] Figure 6 for Figure 3 Enlarged view of part B;

[0052] Figure 7 This is the third cross-sectional view of the planetary reducer described in this embodiment of the present invention;

[0053] Figure 8 for Figure 5Enlarged view of section C;

[0054] Figure 9 This is the second schematic diagram of the overall structure of the planetary reducer described in this embodiment of the present invention;

[0055] Figure 10 This is the second disassembly diagram of the planetary reducer structure described in this embodiment of the utility model;

[0056] Figure 11 This is the fourth cross-sectional view of the planetary reducer described in this embodiment of the present invention.

[0057] In the diagram: 10. Housing; 11. Partition; 111. Through hole; 12. First mating part; 13. Mounting cavity; 131. Mounting port; 132. First wall panel; 133. Second wall panel; 134. Step structure; 135. Adhesive tank; 136. Sealant; 137. Clearance opening; 20. Planetary gear mechanism; 30. Output cover; 31. Internal gear ring; 32. Second mating part; 33. First cavity wall; 34. Second cavity wall; 35. Drainage channel; 40. Waterproof gap; 50. Water storage cavity; 60. First bearing; 70. Fixed bracket; 80. Second bearing; 90. Limiting component; 100. Power unit; 110. Fixing part; 120. Drive part; 130. Drainage hole. Detailed Implementation

[0058] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model are further described in detail below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0059] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can 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 top" of the second 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 second 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.

[0061] An electric wheelchair is an assistive mobile device designed for people with mobility impairments. It is an upgraded version of a traditional manual wheelchair, with the addition of a power drive unit, control mechanism, battery, and other components. The electric wheelchair is mainly powered by a battery, and the control mechanism controls the power drive unit to rotate the wheels, thus enabling the overall movement of the wheelchair.

[0062] One of the core technologies of electric wheelchairs lies in the drive unit. The main function of the reducer is to convert the high-speed, low-torque output of the drive unit into low-speed, high-torque output to meet the driving requirements of the electric wheelchair. Currently, various types of reducers are used in different electric wheelchairs, such as parallel shaft gear reducers, worm gear reducers, and planetary reducers. As one of the many types of reducers, the planetary reducer achieves transmission through a planetary gear mechanism, featuring coaxial input and output. Therefore, the planetary reducer has a relatively regular shape. Compared to parallel shaft gear reducers and worm gear reducers, under the same power requirements, the planetary reducer has a more compact structure and is lighter, making it very suitable for use in space-constrained devices such as electric wheelchairs.

[0063] NGW planetary reducers (internal-male-external) and NW (internal-external) planetary reducers are two common types of planetary reducers. NGW planetary reducers generally consist of a sun gear and planet gears, and their reduction ratio should not be too large, otherwise they will lose their compact advantage. However, increasingly more electric wheelchairs require higher torque, thus planetary reducers need to provide larger reduction ratios, which is something NGW planetary reducers cannot meet. Correspondingly, NW planetary reducers can solve the above dilemma, achieving a regular shape, compact size, and small weight, while also providing a large single-stage reduction ratio.

[0064] However, since the NW planetary reducer outputs through the output cover, and the gear ring is constantly rotating, a certain clearance is required between the output cover and the housing where the gear ring is located. In addition, electric wheelchairs are used in a variety of complex scenarios, and there is a risk of contact with water or moisture in different usage scenarios. When the drive unit of the electric wheelchair is located relatively close to the ground, moisture may enter the planetary reducer and drive unit through the aforementioned clearance, which may cause damage to the internal mechanical structure and electrical components. This not only reduces the reliability and durability of the product, but may also threaten the safety of the user and affect the user experience.

[0065] In view of this, this embodiment provides a planetary reducer, which adopts a simple transmission structure. While meeting the shape and performance requirements in electric wheelchair applications, it improves the waterproof performance of the planetary reducer and the geared motor by setting a waterproof structure, thereby solving the problem of mechanical and electrical failures that are prone to occur in electric wheelchairs.

[0066] Please refer to the instruction manual attached. Figures 1-3 The planetary reducer mainly includes a housing 10, a planetary gear mechanism 20, and an output cover 30. The housing 10 serves as the supporting foundation for the planetary reducer and the geared motor it is used in, ensuring the stable operation of the entire transmission system. For ease of understanding, this embodiment defines the housing 10's two opposite sides along its axial direction as a first side and a second side. The first side provides the power unit 100 with corresponding installation space and position, while the second side provides the planetary gear mechanism 20 and the output cover 30 with corresponding installation positions. In other words, the first side of the housing 10 is the side closer to the power unit 100, and the second side is the side closer to the output cover 30, allowing the transmission between the power unit 100, the planetary gear mechanism 20, and the output cover 30 to all occur through the housing 10, making the overall structure of the planetary reducer more compact and orderly.

[0067] Understandably, the first and second sides of the housing 10 each form a certain installation space to accommodate the power unit 100, planetary gear mechanism 20, output cover 30, and other related components as described above. The spaces within the first and second sides provide a relatively enclosed environment for the entire transmission system, thus initially preventing external impurities, moisture, and dust from entering the transmission system, and also avoiding leakage of lubricating oil from the transmission system into the external environment. Furthermore, the housing 10 also provides some sound insulation and vibration damping, reducing noise and vibration generated by the transmission system during operation, thereby improving the overall stability of the reduction gear in electric wheelchair applications, enhancing product performance, and improving the user's riding experience.

[0068] In order for the housing 10 to meet the relevant performance requirements, it is generally made of high-strength, wear-resistant materials, such as cast iron, cast steel or aluminum alloy. This embodiment does not impose strict limitations or requirements on this.

[0069] Please refer to the appendix. Figures 1-3 The housing 10 has through holes 111 extending through its opposite sides. When the power unit 100 is located on the first side of the housing 10, the through holes 111 allow the drive unit 120 of the power unit 100 to pass through. In this example, the drive unit 120 of the power unit 100 is equipped with a sun gear. The drive unit 120 of the power unit 100 meshes with the planetary gear mechanism 20 through the sun gear, so that power can be smoothly transmitted from the power unit 100 to the planetary gear mechanism 20, thereby realizing the functions of deceleration and power output. As can be seen from the above, the planetary gear mechanism 20 is specifically located on the second side of the housing 10. In order to ensure that the planetary gear mechanism 20 can smoothly transmit power from the power unit 100, each planet gear included in the planetary gear mechanism 20 is rotatably connected to the second side of the housing 10 and surrounds the outer periphery of the sun gear (output unit 120) at intervals.

[0070] In this embodiment, since each planetary gear in the planetary gear mechanism 20 is rotatably mounted on the housing 10, a power unit 100 is provided on the first side of the housing 10, and when the power unit 100 outputs power, the planetary gears rotate relative to the housing 10 during the transmission process, and the torque generated by the rotation is transmitted to the output cover 30 for power output.

[0071] The output cover 30 is specifically located at the output end of the planetary reducer. It is responsible for outputting the power transmitted by the planetary gear mechanism 20 system to external devices (the wheels of an electric wheelchair). Furthermore, the output cover 30 provides support and fixation at the output end of the planetary reducer, ensuring to a certain extent that the planetary gear mechanism 20 will not shift or be damaged due to excessive force during transmission. It also ensures the stability and reliability of the connection between the external device and the planetary reducer. In this embodiment, the output cover 30 is provided with an internal gear ring 31, which is arranged along the circumference of the output cover 30. At least one end of the internal gear ring 31 must have an opening communicating with the outside of the output cover 30, so that the planetary gear mechanism 20 can enter the internal gear ring 31 through this opening and engage with it for transmission. In the aforementioned planetary gear mechanism 20, one end of each planetary gear is rotatably connected to the second side of the housing 10, and the other end is located in the area surrounded by the internal gear ring 31, meshing with the internal gear ring 31 to drive the internal gear ring 31 (output cover 30) to rotate. Therefore, it can be understood that the size of the internal gear ring 31 is much larger than that of the planetary gears. Thus, through the rotation of each planetary gear, the planetary gear mechanism 20 and the internal gear ring 31 can convert the high-speed, low-torque output of the power unit 100 into a low-speed, high-torque output during the transmission process, thereby meeting the power output requirements of the mechanical equipment.

[0072] To ensure a stable meshing relationship between the output cover 30 and the planetary gear mechanism 20 via the internal gear ring 31, the output cover 30 is rotatably connected to the housing 10. Specifically, the output cover 30 can be rotatably connected to the housing 10 via, but is not limited to, bearings, bushings, or other components. These supporting components, such as bearings and bushings, provide a certain supporting force to the output cover 30 through the housing 10 while ensuring that the output cover 30 can rotate relative to the housing, thereby reducing eccentricity, vibration, and other related problems generated during the rotation of the output cover 30, and improving the stability and reliability of the transmission.

[0073] In this embodiment, the output cover 30 and the internal gear ring 31 are integrally formed to further reduce the number of components in the planetary reducer, making the process flow and assembly of the equipment simpler and more efficient, and helping to reduce labor and time costs. No additional connecting parts are needed between the output cover 30 and the internal gear ring 31, reducing energy loss during transmission, improving transmission efficiency, and also enhancing the structural rigidity of the output cover 30 to a certain extent, thus improving the durability and reliability of the transmission system.

[0074] In the application of the geared motor, the planetary reducer uses the housing 10 to provide corresponding installation positions for the power unit 100 and the planetary gear mechanism 20, so that the power unit 100 can directly establish a transmission relationship with the planetary gear mechanism 20, and the planetary gear mechanism 20 can directly drive the output cover 30 to rotate, thus forming an inner and outer planetary reducer structure. While ensuring that the planetary reducer has a high load-bearing capacity, the cooperation between the planetary gear mechanism 20 and the internal gear ring 31 can also give it a higher transmission ratio, so that the torque output by the power unit 100 through the planetary reducer meets the usage requirements of the electric wheelchair. Furthermore, the power unit 100 directly drives the output cover 30 through the planetary gear mechanism 20. The structure is relatively simple in both the axial and radial directions, with relatively few components and materials. Power output is achieved with only three sets of parts, making the planetary reducer structure simpler and more compact than that of a general reducer. This ensures coaxial transmission between the input and drive unit 120, effectively reducing the number of components and materials between the power unit 100 and the electric wheelchair, as well as the installation space occupied by the geared motor on the electric wheelchair, thus meeting the performance and appearance requirements of the electric wheelchair.

[0075] Please continue to refer to the appendix. Figures 3-4 A waterproof structure is also provided between the output cover 30 and the housing 10. This waterproof structure is specifically located within the movement gap between the housing 10 and the output cover 30 to prevent external impurities such as moisture from entering the planetary reducer through this gap, thus mitigating the risk of leakage of lubricating oil and other substances inside the reducer. It is important to understand that since the output cover 30 and the housing 10 are two relatively rotatable components in the planetary reducer, the waterproof structure must accommodate this rotatable characteristic. In this embodiment, the waterproof structure should ensure that water or other liquids have difficulty, or even cannot, penetrate into the housing 10 when the output cover rotates, thus ensuring that the housing 10 and the output cover 30 maintain tight contact during rotation.

[0076] Secondly, it should be noted that due to the complex and diverse usage scenarios of electric wheelchairs, and the relative lack of routine maintenance by users after daily use, the waterproof structure should be able to withstand various forces and torques generated during the operation of the equipment, as well as long-term friction and wear.

[0077] For example, in order for the waterproof structure to possess at least the aforementioned mechanical properties, the waterproof structure may employ one or more combinations of the following:

[0078] 1. Rotary sealing ring: The rotary sealing ring is usually composed of two relatively rotating annular surfaces. In the embodiment where the rotary sealing ring is used as a waterproof structure, one annular surface of the waterproof sealing ring is fixed to the output cover 30, and the other annular surface is fixed to the housing 10. The two annular surfaces are kept in close contact by a spring or elastic material, thereby achieving a waterproof effect.

[0079] 2. Labyrinth sealing structure. The labyrinth sealing structure is a sealing structure formed by multiple intersecting grooves and protrusions. In this embodiment, the labyrinth sealing structure can be formed between the inner surface of the output cover 30 and the outer surface of the housing 10, formed by the mating of the two opposing surfaces, so that when the output cover 30 rotates, these "labyrinths" can prevent water or other liquids from seeping into the interior of the housing 10.

[0080] III. Lip Seal Structure. A lip seal structure is a structure that achieves sealing by utilizing the contact pressure between an elastic lip and a mating surface. In this embodiment, the lip seal structure can be installed inside the output cover 30. When the output cover 30 rotates, the lip of the lip seal rotates accordingly, always maintaining tight contact with the housing 10 (mating surface). The material for the lip seal is usually an elastic material such as rubber or polytetrafluoroethylene. These materials have good elasticity and wear resistance, and can adapt to the rotation and axial movement of the output cover 30.

[0081] This implementation method employs a three-layer waterproof structure, combined with... Figure 4It can be understood that the waterproof structure specifically includes a waterproof gap 40, a water storage cavity 50, and sealant 136. The waterproof gap 40, water storage cavity 50, and sealant 136 are sequentially arranged along the movement gap between the output cover 30 and the housing 10 to achieve the above-mentioned three-layer waterproof effect. The waterproof gap 40, as the first layer in the waterproof structure, can completely prevent larger foreign objects from entering, block most dust, and prevent water from splashing into the planetary reducer during the movement of the electric wheelchair, as well as preventing short-term light rain from entering. The water storage chamber 50 serves as the second layer in the waterproof structure. It communicates with the waterproof gap 40, allowing some water flowing in from the gap to be temporarily stored. This means that if the electric wheelchair encounters severe weather or deep water, the water storage chamber 50 can handle water entering through the gap 40, preventing direct contact between the water and the supporting components between the output cover 30 and the housing 10. Furthermore, since the planetary reducer is generally positioned with its axis essentially parallel to the horizontal plane during normal use of the electric wheelchair... The water storage chamber 50 located below the planetary reducer can use gravity to drain water from the waterproof gap 40 below. Based on factors such as air pressure and gravity, the drainage efficiency of the water storage chamber 50 is slightly higher than the water inflow efficiency. This ensures that the water storage chamber 50 will not be full for a long time, keeping the water outside the planetary reducer. In addition, because the water storage chamber 50 stores air when water does not enter it, when water tries to flow into the waterproof gap 40, the air inside the water storage chamber 50 can also, to some extent, use air pressure to push the water out of the waterproof gap 40, further improving the waterproof performance of the first layer of waterproofing. As the third layer in the waterproof structure, sealant 136 can be applied to the supporting component between the output cover 30 and the housing 10. Applying sealant 136 between the supporting component and the housing 10 and / or between the supporting component and the output cover 30 prevents moisture from entering the housing 10 through gaps in the support component and housing 10, even in harsher conditions such as prolonged immersion in water. This avoids the risk of moisture contact between the supporting component and the housing 10 and / or the output cover 30. Furthermore, it prevents a large amount of water from entering the planetary reducer or even the power unit 10 in a short period after immersion, minimizing the possibility of contact between internal mechanical and electrical components and moisture, thus extending rescue time and preventing excessive damage.

[0082] like Figures 3-4As shown, the waterproof structure in this embodiment includes a first mating part 12 and a second mating part 32, which are specific structural forms of the first waterproof layer. The first mating part 12 and the housing 10, as well as the second mating part 32 and the output cover 30, are integrally formed. The first mating part 12 is formed on the outer periphery of the housing 10 and can be considered part of the housing 10. The second mating part 32 is located on the outer edge of the output cover 30. The housing 10 is fitted with the output cover 30 through the first mating part 12 and the second mating part 32 with a clearance, forming a waterproof gap 40 between the first mating part 12 and the second mating part 32.

[0083] It should be noted that the first mating part 12 and the second mating part 32 should ensure that the output cover 30 can rotate smoothly and stably relative to the housing 10 to meet the functional requirements of the planetary reducer. On this basis, the risk of external moisture penetrating into the equipment should be minimized, that is, the size of the waterproof gap 40 should be set as small as possible to improve the overall waterproof performance and durability of the equipment.

[0084] In one embodiment, in order to reduce the manufacturing and assembly difficulty of the output cover 30 and the housing 10, the cross-sectional shape of the waterproof gap 40 along the axial direction is set to be annular, while the cross-sectional shape of the waterproof gap 40 along the radial direction is set to be a straight structure, that is, the surfaces of the first mating part 12 and the second mating part 32 are both planar.

[0085] In another embodiment, the first mating part 12 and the second mating part 32 may also adopt a form similar to a labyrinth sealing structure, and the waterproof gap 40 is set as a tortuous and meandering structure, thereby increasing the difficulty for water to flow into the planetary reducer from the waterproof gap 40.

[0086] Taking the structure of the waterproof gap 40 extending in a straight line in the radial direction as an example, the second side of the housing 10 is set as a cylindrical structure, and the outer cylindrical wall of the second side of the housing 10 forms a first mating part 12. Correspondingly, the second mating part 32 is set as a folded edge structure surrounding the outer edge of the output cover 30. The output cover 30 is set at one end of the housing 10 away from its first side. The folded edge structure bends toward the housing 10 and extends along the outer cylindrical wall of the second side of the housing 10 so that the first mating part 12 and the second mating part 32 at least partially overlap in the radial direction. When the outer diameter of the output cover 30 is larger than the outer diameter of the housing 10, the output cover 30 covers the cylindrical edge (first mating part 12) of the cylindrical structure through the folded edge structure (second mating part 32) formed on its outer edge, thereby forming a waterproof gap 40 surrounding the housing 10 and the output cover 30.

[0087] In the above embodiment, the surfaces of the first mating part 12 and the second mating part 32 used to form the waterproof gap 40 are arranged parallel to each other. Specifically, the waterproof gap 40 extends along the axial line of the planetary reducer. In this way, the port of the waterproof gap 40 used to connect to the outside of the planetary reducer will not face the radial direction of the planetary reducer, thereby increasing the difficulty of water flowing into the waterproof gap 40. In addition, the first mating part 12 and the second mating part 32 can be appropriately extended or shortened according to actual product requirements, thereby determining the length of the waterproof gap 40. The waterproof gap 40 has uniform dimensions in its extension direction and in the direction surrounding the housing 10, achieving good waterproof consistency. The longer the waterproof gap 40, the better the initial waterproof effect, so that the planetary reducer can achieve a better balance between material cost and waterproof performance.

[0088] Please continue to refer to the appendix. Figures 3-4 As the second layer of waterproofing described above, the waterproofing structure also includes a water storage cavity 50 formed between the housing 10 and the output cover 30. The water storage cavity 50 is arranged around the housing 10 and the output cover 30. The outer periphery of the water storage cavity 50 is connected to the external environment through a waterproof gap 40, so that water entering the waterproof gap 40 from any position in the circumferential direction of the waterproof gap 40 can be stored by the water storage cavity 50.

[0089] As can be seen from the above, the water storage cavity 50 serves as the second line of defense in the waterproof structure. Its purpose is to store water that has breached the waterproof gap 40 and entered the space between the output cover 30 and the housing 10, thus preventing water from entering. Furthermore, in the application of this planetary reducer to a geared motor, and in the specific application scenario of an electric wheelchair, the planetary reducer is typically used with its axis generally horizontal. Therefore, the waterproof gap 40 surrounding the output cover 30 and the housing 10, as well as the portion of the water storage cavity 50, are located at the lower part of the planetary reducer. For example, after water enters the water storage cavity 50 through the waterproof gap 40 on the upper side of the planetary reducer, the water in the water storage cavity 50 flows circumferentially under gravity to the lower part of the water storage cavity 50. Because the waterproof gap 40 is located on the outer periphery of the water storage cavity 50, the water can then be discharged from the planetary reducer through the waterproof gap 40 at the lower part of the water storage cavity 50, thereby alleviating the pressure in the water storage cavity 50 to some extent and improving the waterproof performance of the second layer of the waterproof structure.

[0090] As a specific structural form of the water storage chamber 50, it can be understood that the water storage chamber 50 can also be formed by integrally molding with the housing 10 and the output cover 30 to ensure the structural compactness and sealing performance of the planetary reducer to the greatest extent.

[0091] As a variation of this embodiment, such as Figures 9-11 As shown, in this embodiment, the waterproof structure is also formed by the output cover 30 and the housing 10. In this embodiment, the axial projection size of the output cover 30 on the planetary reducer is larger than the axial projection size of the housing 10 on the planetary reducer, so that the output cover 30 can cover one end of the housing 10 in a similar manner to the above embodiment, and play a certain role in blocking water.

[0092] The body of the water storage cavity 50 is located on the side of the output cover 30 near the housing 10. When the output cover 30 and the housing 10 are engaged, there is a certain gap between the opening of the water storage cavity 50 and the housing 10, thus forming the waterproof gap 40 mentioned above. This waterproof gap 40 is connected to the water storage cavity 50 inside the output cover 30, thereby achieving a multi-layer waterproof effect.

[0093] In this embodiment, as can be seen from the above, the housing 10 can be configured as a cylindrical structure, that is, a hollow mounting cavity 13 is formed inside the housing 10. The mounting cavity 13 can be divided into a first side and a second side by a plate, and the through hole 111 is opened on the partition plate 11. The end of the housing 10 away from the through hole 111 (the end closer to the second side) is also provided with a mounting port 131 that connects to the mounting cavity 13. The mounting cavity 13 can provide corresponding mounting space for the planetary gear mechanism 20, part of the output cover 30, the power unit 100 and related components. In actual application scenarios, the housing 10 is also provided with a cavity opening that connects to the mounting cavity 13 at the position of the first side. The mounting port 131 and the cavity opening can ensure that related components can enter and exit the mounting cavity 13.

[0094] The output cover 30 is partially disposed in the mounting cavity 13 through the mounting port 131. The output cover 30 is provided with a first cavity wall 33 inside the mounting cavity 13, and a second cavity wall 34 is provided outside the mounting cavity 13. The first cavity wall 33 and the second cavity wall 34 extend in a direction that approaches each other, and their ends are spaced apart to form a clearance opening 137. The gap between the first cavity wall 33 and the second cavity wall 34 in the radial direction of the planetary reducer is greater than the thickness of the wall plate of the mounting cavity 13, so that the wall plate of the mounting cavity 13 can be inserted between the first cavity wall 33 and the second cavity wall 34 through the clearance opening 137. In this mating state, the housing 10 and the output cover 30 can still rotate smoothly.

[0095] Furthermore, the first cavity wall 33, the second cavity wall 34, and the inner wall of the mounting cavity 13 wall panel cooperate to form a water storage cavity 50. As can be understood from the above embodiments, the end of the second cavity wall 34 is configured with the folded edge structure used to form the second mating part 32, and the end of the wall panel of the mounting cavity 13 near the mounting opening 131 forms the cylindrical structure used to form the first mating part 12. The end of the first cavity wall 33 is located on the inner wall of the wall panel near the mounting cavity 13, and the end of the second cavity wall 34 is located on the outer wall of the wall panel near the mounting cavity 13. Based on the cooperation of the three to form the water storage cavity 50, the second cavity wall 34 and the outer wall of the mounting cavity 13 (wall panel) are fitted together to form a waterproof gap 40, so as to achieve the purpose of communicating between the waterproof gap 40 and the outer periphery of the water storage cavity 50.

[0096] With the above configuration, when the output cover 30 is positioned at one end of the housing 10, the two together form a water storage cavity 50 and a waterproof gap 40. Both waterproof structures can be formed by the constraint of the output cover 30 and the housing 10 body structure. Furthermore, the waterproof gap 40 is located on the outer periphery of the water storage cavity 50. In addition to allowing water in the lower part of the water storage cavity 50 to be easily discharged through the lower waterproof gap 40, when the output cover 30 rotates relative to the housing 10, the centrifugal force generated during the rotation of the output cover 30 can also throw the water in the water storage cavity 50 toward the waterproof gap 40. This more effectively discharges water from the water storage cavity 50 while also applying greater pressure to the waterproof gap 40, effectively preventing external water from entering through the waterproof gap 40. This achieves the effect of improving the overall waterproof performance of the planetary reducer through the cooperation of two waterproof layers.

[0097] As can be seen from the above, the waterproof gap 40 can not only prevent water from entering between the housing 10 (first mating part 12) and the output cover 30 (second mating part 32) to a certain extent, but also drain water when water enters the water storage chamber 50 through the waterproof gap 40.

[0098] To improve the drainage effect of the water storage chamber 50, this embodiment provides at least two of the following technical solutions:

[0099] I. For example Figures 5-6As shown, the first mating part 12 has a drain hole (not shown) connecting to the outside of the water storage cavity 50. Alternatively, the first mating part 12 and the second mating part 32 have interconnected drain holes 130. When the housing 10 and the output cover 30 are rotated to a state where they are connected, one end of the drain hole 130 connects to the outside of the water storage cavity 50, and the other end connects to the external environment of the planetary reducer. Thus, when a certain amount of water is stored in the water storage cavity 50, the water inside the water storage cavity 50 will flow to the bottom of the water storage cavity 50 under the influence of gravity. At this time, the drain hole 130 below the planetary reducer, being located outside the water storage cavity 50, will be basically parallel to the direction of gravity, and the water below the water storage cavity 50 can be discharged to the outside of the planetary reducer through the drain hole 130.

[0100] II. Figures 7-8 The output cover 30 is provided with a drainage channel 35 inside. One end of the drainage channel 35 is connected to the inside of the water storage chamber 50, and the other end of the drainage channel 35 is connected to the external environment through the side of the output cover 30 away from the housing 10. Specifically, the drainage channel inside the output cover 30 is generally arranged in a direction that is basically parallel to the direction of gravity. In this way, after water enters the drainage channel 35 through the inside of the water storage chamber 50, the water can be discharged into the external environment through the output cover 30 along the direction of gravity.

[0101] Continuing with the structural form provided by the above embodiments, in one embodiment, a first bearing 60 is provided between the housing 10 and the output cover 30 as a supporting component. It is understood that the first bearing 60 includes an inner ring and an outer ring. The inner ring and the outer ring can achieve relative rotation between them by setting rolling elements or by sliding fit. The outer ring of the first bearing 60 is fixed to the inner wall of the mounting cavity 13, and the inner ring of the first bearing 60 is fixed to the outer wall of the output cover 30, thereby allowing the housing 10 and the output cover 30 to maintain a stable fit in the circumferential direction, reducing the possibility of interference between them. Furthermore, by supporting the output cover 30 with the first bearing 60, the load-bearing capacity of the output cover 30 is improved, allowing the planetary reducer to adapt to higher torque in the application of electric wheelchairs.

[0102] As mentioned in the above embodiment, the output cover 30 is provided with a first cavity wall 33 inside the mounting cavity 13. In this embodiment, the first cavity wall 33 extends towards the inner wall of the wall panel of the mounting cavity 13. It, together with the wall panel of the mounting cavity 13 and the second cavity wall 34, encloses and defines the water storage cavity 50. The first cavity wall 33 is also located between the first bearing 60 and the water storage cavity 50. The second cavity wall 34 plays a role in preventing water from flowing from the water storage cavity 50 to the first bearing 60 to a certain extent.

[0103] Please continue to refer to the appendix. Figures 3-4 In order to provide a more stable support force between the housing 10 and the output cover 30, this embodiment sets the mounting cavity 13 to include a first wall plate 132 and a second wall plate 133. The first wall plate 132 and the second wall plate 133 are connected in sequence from the mounting cavity 13 away from the mounting opening 131 toward the mounting opening 131 and surround the outer periphery of the mounting cavity 13. In the embodiment in which a partition 11 is provided in the mounting cavity 13, one end of the first wall plate 132 is connected to the partition 11, the other end of the second wall plate 133 is connected to the second wall plate 133, and the end of the second wall plate 133 away from the first wall plate 132 forms the aforementioned mounting opening 131.

[0104] In this example, the inner diameter of the first wall panel 132 is smaller than the inner diameter of the second wall panel 133, so that a stepped structure 134 is formed between the first wall panel 132 and the second wall panel 133. In view of the above arrangement, the stepped structure 134 is arranged in the direction of the mounting opening 131. Thus, the outer ring of the first bearing 60 is fixedly connected to the second wall plate 133 and abuts against the stepped structure 134, constraining the installation position of the first bearing 60 in one axial direction. Furthermore, based on the constraint of the first bearing 60 by the stepped structure 134 on the housing 10, the second wall plate 133 and the stepped structure 134 also increase the structural complexity of the gap between the outer ring of the first bearing 60 and the housing 10, thereby increasing the difficulty for moisture to flow into the mounting cavity 13 through the gap between the outer ring of the first bearing 60 and the housing 10. The inner ring of the first bearing 60 is fixedly connected to the outer wall of the output cover 30 and abuts against the second wall plate 133, so that the gap between the inner ring of the first bearing 60 and the output cover 30, as well as the gap between the inner ring and the outer ring of the first bearing 60, can be completely blocked by the second cavity wall 34, thus forming the preliminary form of the third layer in the waterproof structure.

[0105] As can be seen from the above, since a rotatable clearance needs to be formed between the output cover 30 and the housing 10, there is still a certain space gap between the inner wall of the first cavity wall 33 and the inner wall of the second wall plate 133, based on the above structural form. There is a risk that moisture will enter through this space gap and come into contact with the first bearing 60.

[0106] Therefore, based on the above (the second cavity wall 34 covers most of the first bearing 60), the third layer of the waterproof structure is mainly used to prevent moisture from entering the mounting cavity 13 from the gap between the outer ring of the first bearing 60 and the housing 10. The waterproof structure also includes a glue-containing groove 135 disposed on the inner wall of the mounting cavity 13. The glue-containing groove 135 is located between the inner wall of the mounting cavity 13 and the outer ring of the first bearing 60. In order to ensure that the housing 10 and the output cover 30 have good waterproof performance in the circumferential direction, the glue-containing groove 135 is also configured to surround the inner wall of the (second) wall panel in the circumferential direction of the mounting cavity 13. In addition, the waterproof structure also includes a sealant 136 disposed between the inner wall of the mounting cavity 13 and the outer ring of the first bearing 60.

[0107] In the above structure, the sealant 136 can fill the error gaps formed between the outer ring of the first bearing 60 and the housing 10, thereby improving the sealing performance between the first bearing 60 and the housing 10. By setting the sealant groove 135, the amount of sealant 136 can be increased, which can also improve the reliability between the first bearing 60 and the housing 10 to a certain extent.

[0108] Understandably, the sealant groove 135 should be positioned where the inner wall of the second wall panel 133 of the housing 10 contacts the outer ring of the first bearing 60, ensuring that the sealant 136 can be evenly applied between the two to form an effective waterproof barrier after the first bearing 60 is further installed in the housing 10.

[0109] The above detailed description of the three-layer waterproof structure enables the planetary reducer to prevent moisture from entering the mounting cavity 13 through the movement gap between the output cover 30 and the housing 10. This significantly reduces the risk of mechanical failure caused by moisture contact with the internal mechanical components of the planetary reducer. Furthermore, it prevents moisture from flowing through the planetary reducer to the power unit 100 and causing electrical component failure. Moreover, the waterproof gap 40 and the water storage cavity 50, as well as the water storage cavity 50 and the sealant 136, have a structurally complementary relationship. They are not completely independent waterproof structures, achieving a waterproof effect that is greater than the sum of its parts.

[0110] In addition, the waterproof gap 40, the water storage cavity 50, and the sealant 136 are basically set along the axial direction of the planetary reducer, which saves the radial dimension of the equipment to the maximum extent. The overall structure is compact and simple, ensuring that the planetary reducer meets the size and shape requirements in the application of geared motors and even electric wheelchairs.

[0111] As an optional implementation method, such as Figure 3As shown, a fixing bracket 70 is also provided between the housing 10 and the output cover 30. The fixing bracket 70 can also be set as a roughly cylindrical structure to ensure that when the first end of the fixing bracket 70 is fixedly installed on the second side of the housing 10, the fixing bracket 70 can form a stable fit with the housing 10 in the circumferential direction through bolts or other connecting parts. In addition, the cylindrical structure will not affect the movement of related components inside the housing 10, and can play a good supporting and positioning role. The second end of the fixing bracket 70 rotatably protrudes from the output cover 30 through the second bearing 80 and is provided with a limiting member 90 for constraining the second bearing 80. In this way, the fixing bracket 70 further improves the supporting force that the housing 10 can provide to the output cover 30. The first bearing 60 mentioned above is mainly used to constrain the output cover 30 in the radial direction on the housing 10, while the fixing bracket 70 can realize the support and restriction of the output cover 30 by the housing 10 in the axial direction.

[0112] Specifically, the outer ring of the second bearing 80 is fixed to the output cover 30, while the inner ring of the second bearing 80 is fitted onto the portion of the fixed bracket 70 that extends from the output cover 30. The limiting member 90 (such as a nut, snap ring, etc.) is located on the side of the second bearing 80 away from the output cover 30, which constrains the inner ring of the second bearing 80 and prevents the second bearing 80 from detaching from the fixed bracket 70 axially, thus ensuring that the fixed bracket 70 keeps the output cover 30 under its control.

[0113] Based on the above structural configuration, the planetary gear mechanism 20 is also mounted on the second side of the housing 10 and the fixed bracket 70 at its opposite ends. The planetary gear mechanism 20 can be rotatably connected to the housing 10 and the fixed bracket 70 by means of integrally formed rotating shafts at its opposite ends, or it can be rotated between the housing 10 and the fixed bracket 70 by means of rotating shafts that are movably inserted inside it. This embodiment does not impose strict limitations or requirements on this. The two ends of the planetary gear mechanism 20 are constrained by the housing 10 and the fixed bracket 70, which can greatly improve its stability during rotation within the mounting cavity 13, thereby ensuring the transmission efficiency between the power unit 100, the planetary gear mechanism 20, and the output cover 30, and effectively reducing the failure rate of the electric wheelchair.

[0114] Please continue to refer to the appendix. Figure 3This utility model also provides a geared motor, which, in addition to the planetary gear reducer provided in any of the above embodiments, further includes a power unit 100. The power unit 100 generally refers to a device that provides power to machinery or equipment. In this geared motor, the power unit 100 is mainly responsible for converting electrical energy or other forms of energy into mechanical energy, thereby driving the planetary gear mechanism 20 system to operate, achieving the functions of deceleration and power output. The power unit 100 can be, but is not limited to, an electric motor, a hydraulic motor, or a pneumatic motor. In this embodiment, the power unit 100 is fixedly installed on the first side of the housing 10 via a fixing part 110. The drive part 120 of the power unit 100 engages with the planetary gear mechanism 20 through a through hole 111, thereby achieving the purpose of transmitting power to the planetary gear mechanism 20.

[0115] For example, taking the implementation of the motor as the power unit 100 as an example, the stator of the motor serves as the fixed part 110 of the power unit 100, while the rotor of the motor serves as the driving part 120 of the power unit 100. In this example, the driving part 120 can be configured as motor shaft teeth according to the structure of the planetary gear mechanism 20. One end of the driving part 120 of the motor is configured as a rotor, and the other end extends from the stator of the motor and is configured as a gear structure that meshes with the planetary gear mechanism 20. With the integrally formed motor shaft teeth, it is possible to avoid further setting gears on the motor rotor (output shaft), thereby reducing the manufacturing and assembly difficulty of the geared motor.

[0116] In summary, by adopting the above-described embodiments, the geared motor can effectively prevent moisture and foreign matter from flowing into the planetary reducer and power unit 100 through the movement gap between the output cover 30 and the housing 10, greatly reducing the risk of mechanical and electrical failures of the geared motor, thereby improving the ability of the electric wheelchair to cope with harsh environments and meeting the needs of users in different usage scenarios.

[0117] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or component 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. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0118] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0119] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0120] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A planetary reduction gear, characterized in that, The utility model relates to a kind of waterproof structure of planetary reducer, including: Housing (10); Planetary gear mechanism (20), it is arranged in the housing (10); Output machine cover (30) is provided with inner gear ring (31), the output machine cover (30) is drivenly engaged with the planetary gear mechanism (20) by the inner gear ring (31), and waterproof structure is further provided between the output machine cover (30) and the housing (10).

2. The planetary reducer of claim 1, wherein, The waterproof structure includes: First fitting portion (12) is formed in the outer circumferential portion of the housing (10); Second fitting portion (32) is arranged on the outer edge of the output machine cover (30), and the housing (10) is gap-fitted with the output machine cover (30) by the first fitting portion (12) and the second fitting portion (32), and a waterproof gap (40) is formed between the first fitting portion (12) and the second fitting portion (32).

3. The planetary reducer of claim 2, wherein, The side of the housing (10) close to the output machine cover (30) is provided as a cylindrical structure, and the outer cylinder wall of the side of the housing (10) close to the output machine cover (30) forms the first fitting portion (12); The second fitting portion (32) is provided as a folded edge structure surrounding the outer edge of the output machine cover (30), and the output machine cover (30) is arranged at one end of the housing (10) close to the output machine cover (30), and the folded edge structure is bent towards the housing (10) and extends along the outer cylinder wall of the housing (10).

4. The planetary reducer of claim 2, wherein, The waterproof structure further includes a water storage cavity (50) formed between the housing (10) and the output machine cover (30), and the water storage cavity (50) is arranged around the housing (10) and the output machine cover (30); The outer circumferential portion of the water storage cavity (50) is in communication with the external environment through the waterproof gap (40).

5. The planetary reduction gear of claim 4, wherein A hollow mounting cavity (13) is formed inside the housing (10), and a mounting opening (131) communicating with the mounting cavity (13) is further provided at one end of the housing (10) close to the output machine cover (30); The output machine cover (30) is partially arranged in the mounting cavity (13) through the mounting opening (131), and the output machine cover (30) is provided with a first cavity wall (33) inside the mounting cavity (13) and a second cavity wall (34) outside the mounting cavity (13), and the first cavity wall (33), the second cavity wall (34), and the inner wall of the mounting cavity (13) cooperatively form the water storage cavity (50), and the second cavity wall (34) and the outer wall of the mounting cavity (13) are gap-fitted to form the waterproof gap (40).

6. The planetary reducer of claim 5, wherein, Drainage holes (130) are provided on the first fitting portion (12) and communicate with the water storage cavity (50);Or Drainage holes (130) are provided on the first fitting portion (12) and the second fitting portion (32) and communicate with each other, one end of the drainage holes (130) communicates with the water storage cavity (50), and the other end of the drainage holes (130) communicates with the external environment of the planetary reducer.

7. The planetary reducer of claim 5, wherein, The output machine cover (30) is internally provided with a drainage channel (35), one end of the drainage channel (35) is communicated with the water storage cavity (50), and the other end of the drainage channel (35) is communicated with the external environment through the side of the output machine cover (30) away from the machine shell (10).

8. The planetary reducer of claim 5, wherein, A first bearing (60) is arranged between the machine shell (10) and the output machine cover (30), the outer ring of the first bearing (60) is fixed to the inner wall of the mounting cavity (13), and the inner ring of the first bearing (60) is fixed to the outer wall of the output machine cover (30). The first cavity wall (33) extends to the inner wall of the mounting cavity (13) and is located between the first bearing (60) and the water storage cavity (50).

9. The planetary reduction gear of claim 8, wherein, The mounting cavity (13) comprises a first wall plate (132) and a second wall plate (133), the first wall plate (132) and the second wall plate (133) are sequentially connected from the side of the mounting cavity (13) away from the mounting port (131) to the direction of the mounting port (131) and surround the outer periphery of the mounting cavity (13), and a stepped structure (134) is formed between the first wall plate (132) and the second wall plate (133). The outer ring of the first bearing (60) is fixedly connected with the second wall plate (133) and abuts against the stepped structure (134), and the inner ring of the first bearing (60) is fixedly connected with the outer wall of the output machine cover (30) and abuts against the second wall plate (133).

10. The planetary reduction gear of claim 8, wherein, The waterproof structure further comprises a glue containing groove (135) arranged on the inner wall of the mounting cavity (13), and the glue containing groove (135) is located between the inner wall of the mounting cavity (13) and the outer ring of the first bearing (60); and A sealant (136) is arranged between the inner wall of the mounting cavity (13) and the outer ring of the first bearing (60).

11. The planetary reduction gear according to any one of claims 1-10, characterized in that, A fixing support (70) is further arranged between the machine shell (10) and the output machine cover (30), a first end of the fixing support (70) is fixedly installed on the side of the machine shell (10) close to the output machine cover (30), a second end of the fixing support (70) is rotatably penetrated through the output machine cover (30) through a second bearing (80) and is provided with a limiting piece (90) for restricting the second bearing (80); Opposite ends of the planetary gear mechanism (20) are respectively installed on the machine shell (10) and the fixing support (70).

12. A reduction motor characterized by Comprise: The planetary reducer of any one of claims 1-11; A power unit (100) is fixedly installed on the side of the machine shell (10) away from the output machine cover (30) through a fixing part (110), and a driving part (120) of the power unit (100) is in transmission engagement with the planetary gear mechanism (20).

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