Multi-purpose novel hub fixed center shaft gear motor

Abstract

The utility model discloses a multi-purpose novel hub fixed central shaft deceleration motor, which comprises a deceleration motor main body, the deceleration motor main body comprises an external rotor motor, a driving gear and a planetary gear carrier assembly, the driving gear is installed in the external rotor motor, is fixed through a sunk screw, is clamped into a shaft clamp spring I, and is installed into an A-type flat key; a hub outer shell is pressed into an inner gear ring, a first bearing is installed in a rear end cover, the end face, making contact with the rear end cover, of the hub outer shell is coated with sealant, and the hub outer shell and the rear end cover are connected and fixed through a first hexagon socket cap screw to form a second assembly. The first assembly is installed in the second assembly to form a gear motor body. According to the utility model, the wheel driving comfort and stability can be reduced; the size is small, torsion is large, and output efficiency is high; and the noise is low, the service life is long, the mechanism structure is simple, the manufacturing process is easy, the cost performance is high, and energy conservation, consumption reduction, cost reduction, efficiency improvement, energy conservation and emission reduction can be achieved for production.

Description

Technical Field

[0001] This utility model relates to the field of geared motor technology, and in particular to a multi-purpose new type of fixed center shaft geared motor for wheel hubs. Background Technology

[0002] A hub motor is an intelligent motor that integrates power electronics, control technology, computer technology, and motor manufacturing technology. It integrates the motor with the wheel, enabling direct tire drive and avoiding the huge power loss of traditional center drive. At the same time, the hub motor can adjust the torque output in real time according to the driving conditions, thereby reducing the contradiction between wheel driving comfort and stability.

[0003] Existing hub motors are expensive, bulky, and have complicated connection and installation processes. They also have low overload capacity, low impact resistance, and short service life. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-purpose new type of fixed center shaft geared motor for wheel hubs, so as to solve the technical problem of low protection of existing lathes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel multi-purpose wheel hub fixed-center shaft geared motor includes a geared motor body, which comprises an outer rotor motor, a drive gear, a planetary gear carrier assembly, and a wheel hub housing. The drive gear is installed inside the outer rotor motor and fixed with countersunk screws, a shaft retaining spring is inserted, and an A-type flat key is installed. The planetary gear carrier assembly is then press-fitted in, forming component one. An internal gear ring is press-fitted into the wheel hub housing, and a bearing is installed into the rear end cover. Sealant is applied to the contact surface between the wheel hub housing and the rear end cover, and the wheel hub housing and the rear end cover are connected and fixed with an internal hexagonal head screw, forming component two. Component one is then assembled into component two to form the geared motor body.

[0007] As a further embodiment of this utility model, it also includes a second bearing, a front end cover, and a double-lip skeleton oil seal. The second bearing is press-fitted into the front end cover. The contact surface between the wheel hub housing and the front end cover is coated with sealant, and the front end cover and the wheel hub housing are connected and fixed by a second hexagonal head screw, and the double-lip skeleton oil seal is installed.

[0008] As a further embodiment of this utility model, the planetary gear carrier assembly includes a pin, a planetary carrier, and planetary gears with inner bearings. The pin is press-fitted into the planetary carrier and the planetary gears with inner bearings and is secured by a shaft retainer.

[0009] As a further embodiment of this utility model, the external rotor motor is a brushless motor, the stator is made of multi-slot ultra-thin (0.15mm) silicon steel sheets stacked and riveted, coated with high-performance insulating material, the wire is made of insulated pure copper wire, and the external rotor is made of multi-pole rare earth strong magnetic material.

[0010] As a further embodiment of this utility model, the sun gear of the planetary gear pair with the inner bearing is made of carburized steel 8620H alloy, and the planetary gear is injection molded using modified nylon PA66+30GF with the inner bearing.

[0011] Compared with the prior art, this utility model has the following advantages: it combines an external rotor motor and a planetary transmission; the central output shaft (one or both ends) is fixed while the outer casing rotates, which can reduce the impact on wheel comfort and stability; it is small in size, has high torque, and high output efficiency; based on the characteristics of hub motors, it can achieve IPX7 waterproof performance; it has low noise, long lifespan, and the overall service life of the machine can reach 20,000 hours; this utility model has a simple structure, is easy to manufacture, and has a high cost-performance ratio, which can help production achieve energy saving, cost reduction, and efficiency improvement, in line with the concept of energy conservation and emission reduction. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the three-body assembly structure for the installation steps of this device;

[0014] Figure 3 This is a schematic diagram of the assembly structure for the first installation step of this utility model;

[0015] Figure 4 This is a schematic diagram of the assembly structure for step two of the installation process of this utility model;

[0016] Figure 5 This is a schematic diagram of the assembly structure of the planetary gear carrier assembly of this utility model;

[0017] In the diagram: external rotor motor (1), drive gear (2), countersunk screw (3), shaft snap ring 1 (4), type A key (5), planetary gear carrier assembly (6), hub housing (7), internal gear ring (8), bearing 1 (9), rear end cover (10), socket head cap screw 1 (11), bearing 2 (12), front end cover (13), socket head cap screw 2 (14), double lip skeleton oil seal (15), pin (16), planetary carrier (17), inner bearing planetary gear (18), shaft snap ring 2 (19). Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] A novel multi-purpose wheel hub fixed-center shaft geared motor includes a geared motor body, which comprises an outer rotor motor 1, a drive gear 2, a planetary gear carrier assembly 6, and a wheel hub housing 7. The drive gear 2 is installed inside the outer rotor motor 1 and fixed by countersunk screws 3, a shaft retaining spring 4 is inserted, and an A-type flat key 5 is installed. The planetary gear carrier assembly 6 is then press-fitted into the gear hub housing 7, forming component one. An internal gear ring 8 is press-fitted into the wheel hub housing 7, and a bearing 9 is installed into a rear end cover 10. Sealant is applied to the contact surfaces of the wheel hub housing 7 and the rear end cover 10, and the wheel hub housing 7 and the rear end cover 10 are connected and fixed by hexagonal head screws 11, forming component two. Component one is then fitted into component two to form the geared motor body.

[0020] It also includes a second bearing 12, a front cover 13, and a double-lip skeleton oil seal 15. The second bearing 12 is press-fitted into the front cover 13. The contact surface between the wheel hub housing 7 and the front cover 13 is coated with sealant, and the front cover 13 and the wheel hub housing 7 are connected and fixed by a second hexagonal head screw 14, and the double-lip skeleton oil seal 15 is installed.

[0021] like Figure 5 As shown, the planetary gear carrier assembly 6 includes a pin 16, a planetary carrier 17, and an inner bearing planetary gear 18. The pin 16 is press-fitted into the planetary carrier 17 and the inner bearing planetary gear 18, and is secured by a shaft retaining spring 19.

[0022] The installation steps of this utility model are as follows: Figure 3 As shown, in step one, the external rotor motor 1 is installed into the drive gear 2, then the countersunk screw 3 is screwed in, and the shaft retaining ring 4 is snapped in. The A-type flat key 5 is installed, and the planetary gear carrier assembly 6 is pressed in to assemble component one.

[0023] like Figure 4 As shown, in step two, the inner gear ring 8 is pressed into the hub housing 7, the bearing 9 is installed into the rear end cover 10, sealant is applied to the contact end face of the hub housing 7 and the rear end cover 10, and the hexagon socket head cap screw 11 is screwed in to connect the hub housing 7 and the rear end cover 10, thus assembling component two.

[0024] like Figure 2 As shown, in step three, after installing component one from step one into component two from step two to form the main body of the geared motor, bearing two 12 is pressed into the front cover 13, sealant is applied to the contact end face of the hub housing 7 and the front cover 13, and hexagonal head screw two 14 is screwed in to connect the front cover 13 and the hub housing 7. The double-lip skeleton oil seal 15 is installed, and the overall assembly is completed.

[0025] This utility model is a two-in-one structure of external rotor motor and planetary transmission; the central shaft is fixed, the outer shell rotates, and the speed ratio of the planetary transmission is adjustable over a wide range (3~10) according to the rotation speed of the outer shell; the sun gear (driving gear) of the planetary transmission is directly connected to the rotor of the external rotor motor, and the central shaft can be output from one end or both ends depending on the conditions.

[0026] This utility model has a simple process and structure, and is easy and convenient to install; moreover, the mechanism itself has error prevention measures to prevent errors during the installation process. During assembly, the direct connection screws between the sun gear (driving gear) of the planetary gear system and the outer rotor motor rotor are pre-tightened, and the stop is used for positioning, so there is no need to worry about the coaxiality of the sun gear installation; when installing the planetary carrier assembly, the central shaft has a key and positioning, so there is no need to worry about improper installation; when installing the internal gear ring and the outer shell, there is a stop and boss for positioning, so there is no need to worry about the coaxiality and slippage of the internal gear installation.

[0027] This utility model's mechanism is small in size, has high torque, and high output efficiency. Compared with existing hub motors, its overall size is 2 / 5 smaller under the same conditions. The minimum outer diameter of this utility model's mechanism is ￠40mm (not limited by torque, nor including other decorative shapes), and its length is 65mm (excluding the output shaft length). Because the central shaft of the outer rotor motor in this utility model's mechanism is fixed, and the outer rotor of the motor is directly connected to the sun gear (driving gear) in the planetary gear train, the transmission efficiency is higher and the operation is smoother under the same conditions.

[0028] Based on the operating conditions of hub motors, this utility model achieves an IPX7 waterproof rating for the entire unit. A double-lip skeleton oil seal is press-fitted into the center hole of the end cap along the central axis. Because the silicone sealant inside the double-lip skeleton oil seal has an interference fit with the central axis, and the silicone sealant on the outer surface of the double-lip skeleton oil seal also has an interference fit with the inner hole of the end cap, automotive-grade sealant is applied to the contact surfaces between the front and rear end caps and the outer shell. After tightening the screws, the airtightness test achieves 0.3 MPa with zero leakage. The overall testing results demonstrate that it meets the IPX7 waterproof requirement.

[0029] This invention features low noise, long lifespan, and a total service life of up to 20,000 hours. The external rotor motor is a brushless motor, with a stator made of multi-slot ultra-thin (0.15mm) silicon steel sheets stacked and riveted, coated with high-performance insulating material. The wiring uses insulated pure copper wire, and the external rotor uses multi-pole rare-earth strong magnetic material. In terms of noise, it controls the noise level to 45±3dBA at 50cm from the motor while ensuring the motor temperature rise does not exceed 60ºC, thus improving motor efficiency and significantly extending its lifespan. The sun gear of the planetary gear pair uses 8620H alloy carburized steel, a high-performance carburized steel with high hardenability. After carbonitriding and quenching, it has a hard and wear-resistant surface and a tough core, high impact toughness, moderate weldability, and good machinability after normalizing. It is commonly used in manufacturing gears that withstand high speeds, medium or heavy loads, and impacts, and is widely used in automotive gears. The planetary gears are injection molded using modified nylon PA66+30GF with internal bearings. Modified nylon PA66+30GF possesses excellent wear resistance, self-lubricating properties, high mechanical strength, and good heat resistance, oil resistance, and chemical resistance. It exhibits stable high and low temperature performance (-40ºC~200ºC), with a long-term operating temperature limit of approximately 140°C, making it a preferred injection molding material for low-noise gears. The bearing encapsulation process is simple and low-cost, ensuring both gear precision (DIN-8 grade) and meeting operational requirements. The internal gear ring is made of 40Cr alloy steel, heat-treated to achieve a high fatigue limit and resistance to repeated impacts, as well as good low-temperature impact toughness. By employing these materials and optimizing gear and structural design, minimal friction between the planetary gear pairs and maximum transmission efficiency are achieved. The materials used in the gears ensure long service life, wear resistance, low noise, and high strength, enabling the gearbox to withstand impacts and operate for extended periods, achieving a service life exceeding 20,000 hours. After the complete motor and planetary gear pair are assembled, the noise level reaches 52±3 dBA at 50cm from the output shaft.

[0030] This utility model's mechanism features high transmission efficiency, low noise, simple structure, and high cost-effectiveness, aligning with the principles of energy conservation and emission reduction. It is a multi-purpose hub-driven geared motor, consisting of a fixed-center-shaft external rotor motor and a set of planetary gear pairs (fixed-axis) driving the outer casing to rotate. Depending on different operating conditions, the output torque ranges from 1 to 6 N·m, exhibiting high transmission efficiency, achieving energy saving, cost reduction, and efficiency improvement, thus conforming to the principles of energy conservation and emission reduction.

[0031] Compared to traditional direct-drive hub motors, which require a significantly larger size to achieve the same torque output under the same operating conditions, and whose outer rotors are made of rare and precious metals, traditional direct-drive hub motors are expensive and bulky. This utility model presents a multi-purpose fixed-center-shaft geared motor for hub motors that, under the same conditions, is 2 / 5 smaller in overall size than traditional direct-drive hub motors. This smaller motor reduces manufacturing costs, decreases energy consumption, and aligns with energy conservation and emission reduction principles.

[0032] Compared to existing hub geared motors, which use a rotating outer rotor with a central shaft as the drive, meaning the central shaft and outer rotor rotate as a single unit, this new multi-purpose hub geared motor with a fixed central shaft eliminates the need for a connecting conversion mechanism at the stator end. In this invention, the central shaft of the outer rotor motor is integrated with the stator, serving only as a support. The planetary gear mechanism is directly connected to the central shaft, and the outer rotor is directly driven by the sun gear. Therefore, this multi-purpose hub geared motor with a fixed central shaft eliminates one connecting conversion mechanism compared to existing hub geared motors, thus reducing costs. Furthermore, by reducing the production of one component, it achieves energy conservation, cost reduction, and efficiency improvement in production, aligning with the principles of energy conservation and emission reduction.

[0033] Compared to existing hub geared motors, which use an external rotor motor with a moving shaft and a central shaft as the drive, converting the rotating central shaft into a fixed shaft requires adding a connecting conversion mechanism to the stator end to connect with a planetary gear mechanism. Existing hub geared motors can only output shafts from the end with the conversion mechanism. This utility model, a multi-purpose fixed-center-shaft geared motor for hubs, integrates the central shaft of the external rotor motor with the stator, with the central shaft only providing support. The output shaft can be from either end or both ends simultaneously. Therefore, this utility model has a wider range of applications.

[0034] The above description is a preferred embodiment of the present utility model. For those skilled in the art, any changes, modifications, substitutions and variations made to the implementation methods without departing from the principles and spirit of the present utility model, based on the teachings of the present utility model, still fall within the protection scope of the present utility model.

Claims

1. A novel multi-purpose wheel hub fixed-center shaft geared motor, characterized in that, The geared motor body includes an external rotor motor (1), a drive gear (2), a planetary gear carrier assembly (6), and a hub housing (7). The drive gear (2) is installed inside the external rotor motor (1) and fixed by countersunk screws (3). A shaft retaining ring (4) is inserted, and an A-type flat key (5) is installed. The planetary gear carrier assembly (6) is press-fitted in to form component one. An internal gear ring (8) is press-fitted into the hub housing (7). A bearing (9) is installed into the rear end cover (10). The contact surfaces of the hub housing (7) and the rear end cover (10) are coated with sealant and connected and fixed to the hub housing (7) and the rear end cover (10) by an internal hexagonal head screw (11) to form component two. Component one is installed into component two to form the geared motor body.

2. The multi-purpose novel fixed-center-shaft geared motor for wheel hubs according to claim 1, characterized in that, It also includes a second bearing (12), a front cover (13), and a double-lip skeleton oil seal (15). The second bearing (12) is press-fitted into the front cover (13). The contact surface between the wheel hub housing (7) and the front cover (13) is coated with sealant, and the front cover (13) and the wheel hub housing (7) are connected and fixed by a second hexagonal head screw (14), and the double-lip skeleton oil seal (15) is installed.

3. The multi-purpose novel fixed-center-shaft geared motor for wheel hubs according to claim 1, characterized in that: The planetary gear carrier assembly (6) includes a pin (16), a planetary carrier (17), and an inner bearing planetary gear (18). The pin (16) is press-fitted into the planetary carrier (17) and the inner bearing planetary gear (18) and is fixed by a shaft retaining spring (19).

4. A novel multi-purpose wheel hub fixed-center shaft reduction motor according to claim 1, characterized in that: The external rotor motor (1) is a brushless motor. The stator is made of multi-slot ultra-thin silicon steel sheets stacked and riveted, coated with high-performance insulating material, and the wire is made of insulated pure copper wire. The external rotor is made of multi-pole rare earth strong magnetic material.

5. A novel multi-purpose wheel hub fixed-center shaft reduction motor according to claim 1, characterized in that: The sun gear of the planetary gear pair of the planetary gear with internal bearing (18) is made of carburized steel 8620H alloy, and the planetary gear is made of modified nylon PA66+30GF internal bearing injection molding.

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