High-protection low-noise planetary reduction hub motor

Abstract

The utility model discloses a kind of high protection low-noise planetary reduction hub motor, it is related to hub motor technical field, including hub body and the motor body being coaxially arranged in hub body, the stator in motor body is coaxially arranged in hub body inside, the rotor in motor body is coaxially sleeved in stator inner chamber, the rotor in motor body is embedded with magnetic steel, one end of hub body along its axial is fixed with rear end cover;In the utility model, by adopting the motor rotor of built-in magnetic steel structure, can effectively utilize reluctance torque, compared with traditional surface-mounted magnetic steel structure, under the same motor volume and material cost, greater torque output can be generated, so as to improve the torque density of motor, through bevel gear planetary reducer, maximum limit amplifies output torque, the noise generated in the process of operation is lower by high-strength plastic material, effectively improve the noise problem of motor, improve the use experience of customer.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, specifically a high-protection, low-noise planetary gear hub motor. Background Technology

[0002] A hub motor is a drive device that integrates the motor directly into the wheel hub. It integrates the power, transmission, and braking devices into the hub, eliminating traditional mechanical transmission components (such as drive shafts, gearboxes, differentials, etc.). This makes the vehicle structure simpler, the transmission efficiency higher, and enables independent drive and control of each wheel, providing greater flexibility for vehicle handling and power distribution.

[0003] Existing hub motors used in industries such as wheeled robots, electric wheelchairs, and mobility scooters have large diameters but low torque. Most of them use surface-mount magnets, resulting in low power density and an inability to provide sufficient power output in a limited space. Furthermore, the motor controller is set up separately from the motor, which increases the complexity and size of the overall system. The separate structure also results in high noise during motor operation, which seriously affects the user experience. At the same time, the protection level is insufficient, and the motor is prone to water ingress and burnout when exposed to water, which reduces the reliability and service life of the motor.

[0004] In view of the above, this application is hereby submitted. Utility Model Content

[0005] The purpose of this invention is to provide a high-protection, low-noise planetary geared hub motor to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a high-protection, low-noise planetary geared hub motor, including a hub body and a motor body coaxially disposed within the hub body. The stator in the motor body is coaxially disposed inside the hub body, and the rotor in the motor body is coaxially sleeved outside the stator. The rotor in the motor body is internally fitted with magnets. A rear end cover is fixed at one end of the hub body along its axial direction, and a front end cover is fixed at the other end. An annular sealing ring is provided at the connection between the rear end cover and the hub body. Rotary bearings are sleeved at both ends of the stator in the motor body along its axial direction and are respectively connected to the rear end cover and the front end cover. An annular sealing ring is provided at the connection between the rotary bearing near the rear end cover and the inner wall of the rear end cover. The rotor in the motor body is coaxially connected to a planetary reducer at the end away from the rear end cover. The stator of the motor body rotates through the sun gear of the planetary reducer and is fixed with a support shaft. The support shaft rotates coaxially through the front end cover to the outside. A ring-shaped sealing ring three is provided at the connection between the front end cover and the hub body. A ring-shaped sealing ring four is provided at the connection between the rotating bearing located near the front end cover and the inner wall of the front end cover.

[0007] Furthermore, the planetary reducer adopts a helical gear structure and is made of high-strength plastic material. Two built-in drivers are coaxially fixed on the side of the stator away from the planetary reducer in the motor body. The built-in drivers are located on the side of the rotor away from the planetary reducer and are set inside the rotating bearing connected to the rear end cover. A connecting spline is coaxially fixed on the outer side of the stator away from the planetary reducer in the motor body. An electromagnetic brake is coaxially sleeved on the outer side of the connecting spline. The electromagnetic brake is connected to the inner wall of the rear end cover. A wiring hole is opened at the center of the side wall of the rear end cover away from the hub body, and a sealing cover is installed in the wiring hole.

[0008] Compared with the prior art, the beneficial effects of this utility model are: 1. By adopting a motor rotor with an internal magnet structure, magnetic reluctance torque can be effectively utilized. Compared with the traditional surface-mounted magnet structure, it can generate greater torque output with the same motor volume and material cost, thereby improving the torque density of the motor. Through the helical planetary reducer, the output torque is maximized. The high-strength plastic material generates less noise during operation, effectively improving the motor noise problem and enhancing the customer's user experience.

[0009] 2. By placing the built-in driver inside the rotating bearing of the rear cover, the extra space occupied by the separate independent controller is eliminated, greatly reducing the overall size and weight of the motor assembly. This makes the hub motor structure more compact, which is beneficial for installation and layout on the vehicle. The rear output shaft of the motor is connected to the electromagnetic brake via a spline, enabling the hub motor to have a parking brake function, improving the safety and stability of the vehicle when it is parked. Attached Figure Description

[0010] Figure 1 A schematic diagram of the overall structure of a high-protection, low-noise planetary geared hub motor from a frontal view. Figure 2 This is a schematic diagram of a high-protection, low-noise planetary geared hub motor from a side view. Figure 3 for Figure 2 Structural cross-sectional view at point AA; Figure 4 This is a schematic diagram of the overall structure of a high-protection, low-noise planetary geared hub motor from the rear view.

[0011] In the picture: 10. Wheel hub body; 11. Built-in driver; 12. Connecting spline; 13. Electromagnetic brake; 14. Sealing ring one; 141. Sealing ring two; 142. Sealing ring three; 143. Sealing ring four; 15. Planetary reducer; 16. Motor body; 20. Rear end cover; 21. Support shaft; 22. Front end cover. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see the appendix Figure 1 To be continued Figure 4 This utility model provides a high-protection, low-noise planetary geared hub motor: including a hub body 10 and a motor body 16 coaxially disposed within the hub body 10. The stator in the motor body 16 is coaxially disposed inside the hub body 10, and the rotor in the motor body 16 is coaxially sleeved on the outside of the stator. The rotor in the motor body 16 is internally fitted with magnets. One end of the hub body 10 along its axial direction is fixed with a rear end cover 20, and the other end is fixed with a front end cover 22. The connection between the rear end cover 20 and the hub body 10 is provided with an annular sealing ring 14. The stator in the motor body 16 along its axial direction is sleeved with rotating bearings at both ends, which are respectively connected to the rear end cover 20 and the front end cover 22. The connection between the rotating bearing near the rear end cover 20 and the inner wall of the rear end cover 20 is provided with an annular sealing ring 141. The rotor of the motor body 16 is coaxially connected to a planetary reducer 15 at the end away from the rear end cover 20. The stator of the motor body 16 rotates through the sun gear of the planetary reducer 15 and is fixed with a support shaft 21. The support shaft 21 rotates coaxially through the front end cover 22 to the outside. The connection between the front end cover 22 and the hub body 10 is provided with an annular sealing ring three 142. The connection between the rotating bearing near the front end cover 22 and the inner wall of the front end cover 22 is provided with an annular sealing ring four 143.

[0014] It should be noted that: multiple annular sealing rings are used to strengthen the seal between the hub body 10 and the front cover 22 and the rear cover 20. Specifically, the rotating bearing connected to the front cover 22 is model 6201-2RS, and the rotating bearing connected to the rear cover 20 is model 16010-2RS, in order to support high-speed rotation. In traditional surface-mount structures, permanent magnets are directly attached to the rotor surface. Although the structure is simple, the magnets are prone to falling off, and the reluctance torque is not fully utilized. This design embeds the magnets inside the rotor core to form a hidden magnetic circuit structure. By optimizing the combined effect of reluctance torque and permanent magnet torque, the motor performance is improved, and the mechanical strength is higher, which can withstand high-speed rotation.

[0015] Please see the appendix Figure 1 To be continued Figure 4 The present invention provides a technical solution: the planetary reducer 15 adopts a helical gear structure and is made of high-strength plastic material. Two built-in drivers 11 are coaxially fixed on the side of the stator away from the planetary reducer 15 in the motor body 16. The built-in drivers 11 are located on the side of the rotor away from the planetary reducer 15, and the built-in drivers 11 are set inside the rotating bearing connected to the rear end cover 20. The stator of the motor body 16 is coaxially fixedly sleeved with a connecting spline 12 on the outer side of the end away from the planetary reducer 15. An electromagnetic brake 13 is coaxially sleeved on the outer side of the connecting spline 12. The electromagnetic brake 13 is connected to the inner side wall of the rear end cover 20. A wiring hole is opened at the center of the side wall of the rear end cover 20 away from the hub body 10. A sealing cover is installed in the wiring hole.

[0016] It should be noted that: in a specific embodiment, the hub body 10 and the internal gear ring in the planetary reducer 15 are connected by four M5 screws. The planetary gear has a built-in 608 ball bearing. The rotation of the rotor drives the planetary gear to rotate, and the planetary gear drives the internal gear ring to rotate, which in turn drives the hub body 10 to rotate synchronously. By directly placing the built-in driver 11 inside the rotating bearing connected to the rear cover 20, the connection distance between the motor body 16 and the built-in driver 11 is shortened, reducing signal interference and power loss. On the other hand, the double-layer drive board avoids adding extra axial length to the motor through a vertical stacking design, thus adapting to the stringent requirements of hub motors for axial dimensions.

[0017] Working principle: By embedding the magnet into the rotor, the motor performance is improved. The rotor drives the sun gear of the planetary reducer 15 to rotate. The power is transmitted to the internal gear ring through the helical gear structure of the planetary gear. The internal gear ring drives the hub body 10 to rotate synchronously. The two ends of the stator are connected to the front cover 22 and the rear cover 20 respectively through rotating bearings. With the cooperation of sealing ring 14, sealing ring 241, sealing ring 342, and sealing ring 43, a high protection level is achieved. One end of the stator is provided with a connecting spline 12, and an external electromagnetic brake 13 is connected to integrate the braking function. The other end is integrated with a double-layer vertically stacked built-in driver 11 to shorten the signal transmission distance and control the axial dimension. The support shaft 21 passes through the front cover 22 to provide structural support. The rear cover 20 has a wiring hole and a sealing cover is installed to ensure internal electrical safety.

Claims

1. A high-protection, low-noise planetary geared hub motor, comprising a hub body (10) and a motor body (16) coaxially disposed within the hub body (10), wherein the stator in the motor body (16) is coaxially disposed inside the hub body (10), and the rotor in the motor body (16) is coaxially sleeved outside the stator, characterized in that: The rotor inside the motor body (16) is fitted with a magnet. The hub body (10) is fixed with a rear end cover (20) at one end along its axial direction and a front end cover (22) at the other end. An annular sealing ring (14) is provided at the connection between the rear end cover (20) and the hub body (10). Rotary bearings are fitted at both ends of the stator in the motor body (16) along its axial direction and are respectively connected to the rear end cover (20) and the front end cover (22). An annular sealing ring (141) is provided at the connection between the rotary bearing near the rear end cover (20) and the inner wall of the rear end cover (20). The rotor of the motor body (16) is coaxially connected to a planetary reducer (15) at the end away from the rear end cover (20). The stator of the motor body (16) rotates through the sun gear of the planetary reducer (15) and is fixed with a support shaft (21). The support shaft (21) rotates coaxially through the front end cover (22) to the outside. A ring-shaped sealing ring three (142) is provided at the connection between the front end cover (22) and the hub body (10). A ring-shaped sealing ring four (143) is provided at the connection between the rotating bearing near the front end cover (22) and the inner wall of the front end cover (22).

2. The high-protection, low-noise planetary geared hub motor as described in claim 1, characterized in that: The planetary reducer (15) adopts a helical gear structure and is made of high-strength plastic material. Two built-in drivers (11) are coaxially fixed on the side of the stator away from the planetary reducer (15) in the motor body (16). The built-in drivers (11) are located on the side of the rotor away from the planetary reducer (15) and are located inside the rotating bearing connected to the rear end cover (20).

3. The high-protection, low-noise planetary geared hub motor as described in claim 1, characterized in that: The stator of the motor body (16) is coaxially fixedly sleeved on the outer side of the end away from the planetary reducer (15). An electromagnetic brake (13) is coaxially sleeved on the outer side of the connecting spline (12). The electromagnetic brake (13) is connected to the inner side wall of the rear end cover (20). A wiring hole is opened at the center of the side wall away from the hub body (10) of the rear end cover (20). A sealing cover is installed in the wiring hole.

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