Multi-purpose novel hub fixed center shaft gear motor

Abstract

The invention discloses a multi-purpose novel hub fixed central shaft gear motor, which comprises a gear motor main body, the gear motor main body comprises an outer rotor motor, a driving gear and a planetary gear carrier assembly, the driving gear is installed in the outer rotor motor, is fixed through a sunk screw, is clamped into a shaft snap 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 invention, the wheel driving comfort and stability can be reduced; the size is small, torsion is large, and output efficiency is high; the noise is low, the service life is long, the mechanism structure is simple, the manufacturing process is easy, the cost performance is high, energy conservation, consumption reduction, cost reduction and efficiency improvement can be achieved for production, and the concept of energy conservation and emission reduction is met.

Description

Technical Field

[0001] The invention relates to the technical field of reduction motors, and in particular to a multi-purpose new type of fixed center shaft reduction motor for a wheel hub. Background Art

[0002] The 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 to achieve direct tire drive, avoiding the huge power loss of traditional center transmission. At the same time, the hub motor can adjust the torque in real time according to the driving status, thereby reducing the contradiction between wheel driving comfort and stability.

[0003] However, existing hub motors are expensive, too large, and require complicated connection and installation processes. They also have low overload capacity and impact resistance and a short service life. Summary of the invention

[0004] The object of the present invention is to provide a new type of multi-purpose wheel hub fixed center shaft reduction motor to solve the technical problem of low protection of existing lathes.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A new type of multi-purpose fixed center shaft reduction motor for a wheel hub, comprising a reduction motor body, the reduction motor body comprising an outer rotor motor, a driving gear, a planetary gear frame assembly and a wheel hub outer shell, the driving gear is installed in the outer rotor motor and fixed by a countersunk screw, a shaft retaining ring is inserted, and an A-type flat key is installed, and the planetary gear frame assembly is pressed into component one, the wheel hub outer shell is pressed into an inner gear ring, the bearing is installed into the rear end cover, the contact end surface of the wheel hub outer shell and the rear end cover is coated with sealant, and the wheel hub outer shell and the rear end cover are connected and fixed by a hexagon socket cylindrical head screw to form component two, and the component one is installed into component two to form the reduction motor body.

[0006] As a further solution of the present invention, it also includes bearing 2, front end cover, and double-lip skeleton oil seal. The bearing 2 is pressed into the front end cover, the contact end surface of the wheel hub outer shell and the front end cover is coated with sealant, and the front end cover is connected and fixed to the wheel hub outer shell by hexagon socket head screw 2, and the double-lip skeleton oil seal is installed.

[0007] As a further solution of the present invention, the planetary gear carrier assembly includes a pin shaft, a planetary carrier and a planetary gear with an inner bearing. The pin shaft is pressed into the planetary carrier and the planetary gear with an inner bearing, and is clamped into the shaft and fixed with a second retaining spring.

[0008] As a further solution of the present invention, the outer rotor motor adopts a brushless motor, the stator is a multi-slot ultra-thin (0.15mm) silicon steel sheet stacked and riveted, and is sprayed with high-performance insulation material for rubber coating. The wire is insulated pure copper wire, and the outer rotor adopts multi-pole logarithmic rare earth strong magnetic material.

[0009] As a further solution of the present invention, the sun gear of the planetary gear pair with an inner bearing planetary gear is made of alloy carburized steel 8620H, and the planetary gear is injection molded with improved nylon PA66+30GF inner bearing.

[0010] Compared with the prior art, the present invention has the following advantages: external rotor motor + planetary transmission two-in-one; the central output shaft (one end or both ends) is fixed, and the outer shell rotates, which can reduce the comfort and stability of wheel driving; small size, large torque, and high output efficiency; according to the characteristics of the hub motor, it can achieve IPX7 waterproof effect; low noise, long life, and the service life of the whole machine can reach 20,000 hours; the present invention has a simple structure, easy manufacturing process, high cost performance, can achieve energy saving and consumption reduction, reduce costs and increase efficiency for production, and conform to the concept of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the three-body assembly structure of the installation steps of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the first installation step of the present invention; Figure 4 This is a schematic diagram of the assembly structure of the second installation step of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the planetary gear carrier assembly of the present invention; In the figure: an outer rotor motor (1), a driving gear (2), a countersunk screw (3), a shaft retaining ring (4), an A-type flat key (5), a planetary gear carrier assembly (6), a hub outer shell (7), an inner gear ring (8), a bearing (9), a rear end cover (10), a hexagon socket head screw (11), a bearing (12), a front end cover (13), a hexagon socket head screw (14), a double lip skeleton oil seal (15), a pin (16), a planetary carrier (17), a planetary gear with an inner bearing (18), and a shaft retaining ring (19). DETAILED DESCRIPTION

[0012] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] A new type of multi-purpose fixed center axis reduction motor for a wheel hub, including a reduction motor body, the reduction motor body including an outer rotor motor 1, a driving gear 2, a planetary gear frame assembly 6 and a wheel hub outer shell 7, the driving gear 2 is installed in the outer rotor motor 1 and fixed by a countersunk screw 3, a shaft retaining ring 4 is inserted, and an A-type flat key 5 is installed, and the planetary gear frame assembly 6 is pressed into component one, the wheel hub outer shell 7 is pressed into an inner gear ring 8, the bearing 9 is installed into the rear end cover 10, the contact end faces of the wheel hub outer shell 7 and the rear end cover 10 are coated with sealant, and the wheel hub outer shell 7 and the rear end cover 10 are connected and fixed by a hexagon socket cylindrical head screw 11 to form component two, and the component one is installed into component two to form the reduction motor body.

[0014] It also includes a bearing 2 12, a front end cover 13, and a double-lip skeleton oil seal 15. The bearing 2 12 is pressed into the front end cover 13, and the contact end faces of the hub outer shell 7 and the front end cover 13 are coated with sealant, and the front end cover 13 is connected and fixed to the hub outer shell 7 by a hexagon socket head screw 2 14, and the double-lip skeleton oil seal 15 is installed.

[0015] like Figure 5 As shown, the planetary gear carrier assembly 6 includes a pin shaft 16, a planetary carrier 17 and a planetary gear 18 with an inner bearing. The pin shaft 16 is pressed into the planetary carrier 17 and the planetary gear 18 with an inner bearing, and is fixed by a shaft retaining spring 19.

[0016] The installation steps of the present invention are as follows: Figure 3 As shown, in step one, the outer rotor motor 1 is installed into the driving gear 2, and then the countersunk screw 3 is screwed in, and the shaft retaining ring 4 is clamped in, the A-type flat key 5 is installed, and the planetary gear carrier assembly 6 is pressed in to assemble into assembly one.

[0017] like Figure 4 As shown, step two, press the inner gear ring 8 into the wheel hub outer shell 7, install the bearing 9 into the rear end cover 10, apply sealant on the contact end surface of the wheel hub outer shell 7 and the rear end cover 10, screw in the hexagon socket head screw 11 to connect the wheel hub outer shell 7 and the rear end cover 10, and assemble into component two.

[0018] like Figure 2 As shown, in step three, after the component one in step one is installed into the component two in step two to form the main body of the reduction motor, the bearing two 12 is pressed into the front end cover 13, the contact end surface of the hub outer shell 7 and the front end cover 13 is coated with sealant, the hexagon socket head screw two 14 is screwed in to connect the front end cover 13 and the hub outer shell 7, and the double lip skeleton oil seal 15 is installed, and the overall assembly is completed.

[0019] The present invention is a two-in-one structure of an outer rotor motor + planetary transmission; the central shaft is fixed, the outer shell rotates, and the planetary transmission speed ratio can be adjusted in 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 outer rotor motor, and the central shaft can be output from one end or both ends according to conditions.

[0020] The mechanism of the present invention has simple process and structure, and is easy and convenient to install; and the mechanism itself is error-proof and will not make mistakes during the installation process. During the assembly process, the screws directly connected to the sun gear (driving gear) of the planetary gear system and the outer rotor motor rotor are pre-tightened and the stopper is positioned, so there is no need to consider the coaxiality of the sun gear installation; when installing the planetary frame assembly, the center shaft has a key and positioning, so there is no need to worry about the problem of inadequate installation; when the inner gear ring and the outer shell are installed, the stopper and the boss are positioned, so there is no need to consider the coaxiality and slippage of the full installation of the inner gear.

[0021] The mechanism of the present invention has a small volume, large torque and high output efficiency. Compared with the existing hub motor, under the same conditions, the overall volume is 2 / 5 smaller. The minimum outer diameter of the mechanism of the present invention is ￠40mm (not limited to torque, nor including other modified shapes), and the length is 65mm (excluding the length of the shaft). Because the central axis of the outer rotor motor in the mechanism of the present invention is fixed, the outer rotor of the motor is directly connected to the sun gear (driving gear) in the planetary gear system, so under the same conditions, the transmission efficiency is higher and the operation is smoother.

[0022] The mechanism of the present invention can achieve IPX7 waterproof effect for the whole machine according to the working conditions of the hub motor. A double-lip skeleton oil seal is pressed into the center hole of the end cover in the direction of the center axis, because the inner hole silicone of the double-lip skeleton oil seal has an interference fit with the center axis, and the outer surface silicone of the double-lip skeleton oil seal also has an interference fit with the inner hole of the end cover. Apply automotive-grade sealant to the contact surface between the front and rear end covers and the outer shell, and after the screws lock the front and rear end covers and the outer shell, the airtight test can reach 0.3Mpa zero leakage. From the test results of the whole machine, the waterproof IPX7 waterproof requirement can be met.

[0023] The invention has low noise and long service life, and the service life of the whole machine can reach 20,000 hours. The outer rotor motor adopts a brushless motor, the stator is a multi-slot ultra-thin (0.15mm) silicon steel sheet stacked and riveted, and the high-performance insulation material coating process is sprayed on the outside. The wire adopts insulated pure copper wire, and the outer rotor adopts multi-pole logarithmic rare earth strong magnetic material. In terms of noise, it can control the noise to 45±3dBA at 50cm away from the motor, and ensure that the temperature rise of the motor does not exceed 60ºC, thereby improving the efficiency of the motor and greatly improving its service life. The gear material used for the sun gear of the planetary gear pair is alloy carburizing steel 8620H, which is a carburizing steel with good performance and high hardenability. After carbonitriding and quenching, it has a hard and wear-resistant surface and a tough core, with high impact toughness, medium weldability, and good normalizing machinability. It is often used to manufacture gear materials that withstand high speed, medium or heavy loads, and impact, and is widely used in automotive-grade gears. The planetary gear is injection molded with modified nylon PA66+30GF bearings. Modified nylon PA66+30GF has excellent wear resistance, self-lubrication, high mechanical strength, good heat resistance, oil resistance and chemical resistance; modified nylon PA66+30GF has stable high and low temperature performance (-40ºC~200ºC), and the upper temperature limit for long-term use is about 140°C, which is often the first injection molding material for low-noise gears; the bearing encapsulation process is simple and low cost, which can not only ensure the gear accuracy (DIN-8 grade) but also meet the use conditions. The inner gear ring is made of alloy steel 40Cr, which has a high fatigue limit and resistance to multiple impacts after quenching and tempering treatment, and has good low-temperature impact toughness. By adopting the above materials, as well as the optimal gear and structural design, the minimum friction between the planetary gear pairs and the highest transmission efficiency can be achieved. The above materials used in the gears ensure that the gears can achieve long-life wear resistance, low noise and high strength, so as to achieve the impact resistance and long-term operation of the gearbox, and achieve a working life of more than 20,000 hours. After the whole motor + planetary gear pair is assembled, the noise reaches 52±3dBA at 50cm from the output shaft end.

[0024] The mechanism of the present invention has high transmission efficiency, low noise, simple process structure, high cost performance, and is in line with the concept of energy conservation and emission reduction. The mechanism of the present invention is a hub-driven reduction motor for multiple product uses. The outer shell is driven to rotate by a fixed central shaft outer rotor motor + a set of planetary gear pairs (fixed shaft). According to different working conditions, the output torque is 1~6N.m, with high transmission efficiency, achieving energy conservation and consumption reduction, cost reduction and efficiency improvement, and in line with the concept of energy conservation and emission reduction.

[0025] Compared with the traditional direct-drive hub motor, under the same working conditions, to achieve the same torque output rotation, the traditional direct-drive hub motor needs to be much larger in volume, and the materials used to manufacture the outer rotor of the hub motor are rare metals and precious metals, so the traditional direct-drive hub motor is expensive and large in volume. The multi-purpose new hub fixed central axis reduction motor of the present invention is 2 / 5 smaller in overall volume than the traditional direct-drive hub motor under the same conditions, the motor volume becomes smaller, the manufacturing cost is reduced, and the energy consumption is reduced, which is in line with the concept of energy conservation and emission reduction.

[0026] Compared with the existing wheel hub reduction motor, the outer rotor motor used in the existing wheel hub reduction motor is the dynamic shaft, and the center shaft is used as the drive, that is, the center shaft and the outer rotor rotate integrally. In order to turn the rotating center shaft into a fixed shaft, it is necessary to add a connection conversion mechanism at the stator end to connect with the planetary gear mechanism to achieve it. The multi-purpose new wheel hub with a fixed center shaft reduction motor, the center shaft of the outer rotor motor is integrated with the stator, the center shaft is only used as a support, the planetary gear mechanism is directly connected to the center shaft, and the outer rotor is directly connected to the sun gear for driving. Therefore, compared with the existing wheel hub reduction motor, the multi-purpose new wheel hub with a fixed center shaft reduction motor of the present invention reduces a connection conversion mechanism, thereby reducing costs; because the production of one component is reduced, energy saving and consumption reduction can be achieved for production, cost reduction and efficiency improvement can be achieved, which is in line with the concept of energy conservation and emission reduction.

[0027] Compared with the existing wheel hub reduction motor, the outer rotor motor used in the existing wheel hub reduction motor is the dynamic shaft, and the center shaft is used as the drive. In order to turn the rotating center shaft into a fixed shaft, it is necessary to add a connection conversion mechanism at the stator end to connect it with the planetary gear mechanism. The existing wheel hub reduction motor can only output the shaft at one end with the conversion mechanism. The multi-purpose new wheel hub fixed center shaft reduction motor of the present invention, the center shaft of the outer rotor motor is integrated with the stator, and the center shaft is only used for support. The shaft output method can be at any end, or at both ends at the same time. Therefore, the multi-purpose new wheel hub fixed center shaft reduction motor of the present invention has a wider application scenario.

[0028] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A new type of multi-purpose hub with a fixed central shaft reduction motor, characterized in that: The invention comprises a reduction motor body, wherein the reduction motor body comprises an outer rotor motor (1), a driving gear (2), a planetary gear frame assembly (6) and a wheel hub outer shell (7); the driving gear (2) is installed in the outer rotor motor (1) and fixed by a countersunk screw (3), is clamped into a shaft retaining ring (4), is loaded with an A-type flat key (5), and is pressed into the planetary gear frame assembly (6) to form a component one; the wheel hub outer shell (7) is pressed into an inner gear ring (8), the bearing (9) is installed into a rear end cover (10), a sealant is applied to the contact end faces of the wheel hub outer shell (7) and the rear end cover (10), and the wheel hub outer shell (7) and the rear end cover (10) are connected and fixed by a hexagon socket head screw (11) to form a component two; the component one is installed into the component two to form the reduction motor body.

2. The multi-purpose new type wheel hub fixed center shaft reduction motor according to claim 1 is characterized in that: It also includes a second bearing (12), a front end cover (13), and a double-lip skeleton oil seal (15). The second bearing (12) is press-fitted into the front end cover (13). Sealant is applied to the contact end faces of the wheel hub outer shell (7) and the front end cover (13). The front end cover (13) and the wheel hub outer shell (7) are connected and fixed by a second hexagon socket head screw (14), and the double-lip skeleton oil seal (15) is installed.

3. The multi-purpose new type wheel hub fixed center shaft reduction motor according to claim 1 is characterized in that: The planetary gear carrier assembly (6) comprises a pin shaft (16), a planetary carrier (17) and a planetary gear (18) with an inner bearing. The pin shaft (16) is press-fitted into the planetary carrier (17) and the planetary gear (18) with an inner bearing, and is clamped into the shaft with a second retaining ring (19) for fixation.

4. The multi-purpose new type wheel hub fixed center shaft reduction motor according to claim 1 is characterized in that: The outer rotor motor (1) adopts a brushless motor, the stator is a multi-slot ultra-thin (0.15mm) silicon steel sheet stacked and riveted, the external high-performance insulation material is sprayed with a rubber coating process, the wire is an insulated pure copper wire, and the outer rotor is made of a multi-pole pair rare earth strong magnetic material.

5. The multi-purpose new type wheel hub fixed center shaft reduction motor according to claim 1 is characterized in that: The sun gear of the planetary gear pair of the inner bearing planetary gear (18) is made of alloy carburized steel 8620H, and the planetary gear is injection molded by improved nylon PA66+30GF inner bearing.

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