CN218041006U - Electric bicycle hub motor based on oil lubrication - Google Patents

Abstract

The utility model discloses an electric bicycle wheel hub motor based on oil lubrication mainly comprises motor, motor seal cover, planetary gear system etc. and planetary gear system gear adopts the liquid lubrication oil lubrication, can improve the motor lubrication condition, and improves the motor heat-sinking capability to the motor is installed the motor seal cover, prevents that lubricating oil from getting into the motor winding. The utility model discloses have lubricated abundant, the good advantage of heat dispersion for traditional oil lubrication, improved motor and reduction gear's running performance and life-span.

Description

Electric bicycle hub motor based on oil lubrication

Technical Field

The utility model belongs to electric bicycle drive and transmission field, in particular to electric bicycle wheel hub motor based on oil lubrication.

Background

Nowadays, electric bicycles become a tool for riding instead of walk for people on daily trips, and the performance and the service life of the hub motor as a core power device of the electric bicycle influence the driving experience. The hub motors of the common electric bicycles in the market at present have a direct drive type and a gear reduction type. The direct-drive hub motor has the advantages of large radial size, small axial size, low rotating speed and higher output torque, but has larger winding working current and high heat productivity when starting and climbing.

The gear reduction type hub motor is small in radial size and light in weight, but the efficiency is slightly low due to the fact that the gear reduction type hub motor carries a reduction gear, gear meshing can generate heat and wear, the existing gear reduction hub motor is lubricated by lubricating grease, although the existing gear reduction type hub motor has a certain lubricating effect and can reduce certain meshing noise, the existing gear reduction type hub motor is not beneficial to heat dissipation and is suitable for lower gear rotating speed.

Patent CN201610763774.9 discloses a geared hub motor lubricated by liquid lubricating oil, which is characterized by mainly comprising an axial flux motor, a two-stage reduction gear train, a motor sealing strip and the like. The motor can output larger torque through two-stage gear reduction, is lubricated by liquid oil, has high gear transmission efficiency, but only adopts sealant for sealing between two rotors of the motor, and when the motor actually runs for a long time, the sealant can be aged or even failed under the condition of alternative temperature, so that lubricating oil enters the motor, and the power motor is damaged.

Patent CN201410146626.3 discloses an electric bicycle hub motor, which is characterized in that the electric bicycle hub motor mainly comprises a motor shaft, a two-stage speed reducing mechanism, a one-way clutch and the like, wherein the motor shaft is rotatably installed. The hub motor can output a large transmission ratio, can realize a speed change function by means of the cooperation of the one-way bearing, has large output torque and strong adaptability to different road conditions, but adopts grease lubrication, so that the reduction gear is insufficiently lubricated and has low transmission efficiency.

Patent CN202021384268.7 discloses a light-duty electric bicycle has geared hub motor, and its characteristic mainly includes motor shaft, motor power, planetary gear reduction mechanism, and this utility model stator yoke dish and stator frame are with tenon fourth of the twelve earthly branches structural connection, compact structure, with low costs, nevertheless because the motor is not done sealed processing, and reduction gear adopts the fat lubrication, causes transmission efficiency lower, is not suitable for high-speed operation.

Therefore, the utility model discloses improve traditional gear reduction in-wheel motor, for motor power installation motor sealed cowling, utilize O type sealing washer, holding screw and oil retainer, improve the sealed effect of motor to adopt the lubricated mode of immersion oil to planet reduction gear, improve the lubricated effect of gear, and the convection current heat dissipation of motor and gear, realize reduction gear and the heat dissipation of motor power integral type.

SUMMERY OF THE UTILITY MODEL

To the lubricated bad scheduling problem of heat dissipation of present speed reduction drive electric bicycle motor, the utility model discloses a motor seal cover is sealed with the motor to adopt the lubricated mode of immersion oil to planetary gear train, improve gear lubrication and radiating effect, and can prolong gear and motor life-span. Provides a new proposal for the improvement of the hub motor of the electric bicycle.

The utility model discloses a realize above-mentioned purpose and adopt following technical scheme:

the utility model relates to an electric bicycle wheel hub motor's characteristics lie in that, this wheel hub motor mainly comprises motor shaft, motor seal cover, motor power, left end lid, motor cover sealing washer, motor cover holding screw, wheel hub, oil retainer, oil plug, ring gear, planet wheel, planet carrier, sun gear, right-hand member lid, lubricating oil. The motor shaft is fixedly connected with the power motor stator, and the motor sealing cover is fixedly connected with the power motor rotor through the motor cover set screw and is sealed by the motor cover sealing ring; the sun gear is fixedly connected with the power motor rotor, the planet carrier is connected with the motor shaft key, the planet gear and the planet carrier form a revolute pair through a bearing, the planet gear is externally meshed with the sun gear and is simultaneously internally meshed with the gear ring, and the gear ring is fixedly connected with the hub; the left end cover and the motor shaft form a rotating pair through a bearing and are fixedly connected with the hub, and the right end cover and the motor shaft form a rotating pair through a bearing and are fixedly connected with the hub.

A electric bicycle wheel hub motor based on oil lubrication's characteristics also lie in, planetary gear train uses lubricating oil soaks the oil lubrication. In order to ensure the sealing performance of the motor, the power motor and the motor sealing cover are sealed through the motor cover sealing ring and the motor cover set screw, and a rotor inner ring of the power motor is sealed through the oil retainer ring so as to prevent lubricating oil from immersing in the power motor.

Compared with the prior art, the utility model discloses beneficial effect embodies:

1. the utility model discloses reduction gear adopts liquid oil lubrication, is favorable to reducing wearing and tearing and meshing calorific capacity between the gear, has prolonged the gear life-span to can effectively reduce gear meshing noise, improve motor drive efficiency.

2. The utility model discloses a reduction gear and power motor integral type heat dissipation, the loss when the motor operation generates heat when through heat-conduction between the part, can also carry out the convection through lubricating oil, improves the operating performance and the life-span of motor.

3. For guaranteeing motor power's leakproofness, prevent that lubricated fluid from soaking the motor, the utility model discloses a detachable motor seal cover utilizes O type sealing washer and holding screw to guarantee the inseparable type of motor and motor cover joint, utilizes the oil scraper ring to prevent that fluid from getting into inside the motor from the sun gear hole simultaneously, has that the leakproofness is good, advantages such as easy dismounting.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Figure 2 is the utility model discloses wheel hub motor shaft mapping cross-sectional view.

Reference numbers in the figures: 1, a motor shaft; 2, a motor sealing cover; 3, a power motor; 4, a left end cover; 5, a motor cover sealing ring; 6 motor cover set screw; 7, a hub; 8 oil slingers; 9, an oil plug; 10, gear ring; 11 planet wheels; 12 a planet carrier; 13 sun gear; 14 a right end cap; 15 lubricating oil.

Detailed Description

The following description of the present invention will be made by referring to the drawings and embodiments, in which the present invention is further illustrated.

The specific working principle of the utility model is explained as follows:

according to the power and speed demand that electric bicycle traveles at present to satisfy the demand of big drive ratio big moment of torsion when vehicle starting or special road conditions, the tooth number of design is shown as table 1:

TABLE 1 Gear teeth number table

Gear name	Sun wheel	Planet wheel	Gear ring	Transmission ratio
					Number of teeth	23	43	109	4.74

The embodiment is as follows: referring to fig. 1, an oil lubrication based hub motor of an electric bicycle comprises a power motor 3, a motor sealing cover 2, a motor cover sealing ring 5, a motor cover set screw 6, a hub 7, an oil scraper ring 8, an oil plug 9, a set of planetary gear trains (a gear ring 10, a planetary gear 11, a planetary carrier 12 and a sun gear 13), a left end cover 4, a right end cover 14 and the like; refer to fig. 2, do the utility model discloses in-wheel motor and electric bicycle tire steel ring installation axle mapping, the utility model discloses but the electric bicycle tire that multiple size model of adaptation is very little.

For power and transmission aspects. Firstly, the power motor 3 is fixedly connected with the sun gear 13, power is directly transmitted to the sun gear 13, the sun gear 13 is externally meshed with the planet gear 11, the planet carrier 12 and the planet gear 11 form a revolute pair through a bearing, the planet gear 11 is internally meshed with the gear ring 10, the gear ring 10 is fixedly connected inside the hub 7, and power is output at a certain transmission ratio.

For lubrication and sealing. Aiming at the planetary gear train, the planetary gear train specifically comprises a gear ring 10, a planetary gear 11, a planet carrier 12 and a sun gear 13, wherein the gear ring, the planetary gear 11, the planet carrier 12 and the sun gear 13 are subjected to oil immersion lubrication by using lubricating oil 15, and lubricating oil in a hub is sealed by using an oil plug 9; in order to ensure the sealing performance of the power motor, the power motor 3 and the motor sealing cover 2 are sealed by a motor cover sealing ring 5 and a motor cover fastening screw 6, and the inner ring of a rotor of the power motor 3 is sealed by an oil retainer 8 so as to prevent lubricating oil 15 from immersing; as shown in fig. 1, the lubricating oil 15 is disposed at the bottom of the hub motor, and lubrication and heat dissipation effects of the planetary reduction gear can be improved by adopting oil lubrication.

Claims (2)

1. An electric bicycle hub motor based on oil lubrication is characterized by comprising a motor shaft (1), a motor sealing cover (2), a power motor (3), a left end cover (4), a motor cover sealing ring (5), a motor cover set screw (6), a hub (7), an oil baffle ring (8), an oil plug (9), a gear ring (10), a planet wheel (11), a planet carrier (12), a sun wheel (13), a right end cover (14) and lubricating oil (15);

the motor shaft (1) is fixedly connected with a stator of the power motor (3), the motor sealing cover (2) is fixedly connected with a rotor of the power motor (3) through a motor cover set screw (6), and the motor sealing cover is sealed through a motor cover sealing ring (5); the sun gear (13) is fixedly connected with a rotor of the power motor (3), the planet carrier (12) is connected with the motor shaft (1) in a key mode, the planet gear (11) and the planet carrier (12) form a revolute pair through a bearing, the planet gear (11) is externally meshed with the sun gear (13) and is simultaneously internally meshed with the gear ring (10), and the gear ring (10) is fixedly connected with the hub (7); the left end cover (4) and the motor shaft (1) form a rotating pair through a bearing and are fixedly connected with the hub (7), and the right end cover (14) and the motor shaft (1) form a rotating pair through a bearing and are fixedly connected with the hub (7).

2. The electric bicycle hub motor based on oil lubrication according to claim 1, wherein the planetary gear train is lubricated by the lubricating oil (15) in an oil immersion manner, in order to ensure motor sealing performance, the power motor (3) and the motor sealing cover (2) are sealed by the motor cover sealing ring (5) and the motor cover fastening screw (6), and the rotor inner ring of the power motor (3) is sealed by the oil retainer ring (8) to prevent the lubricating oil (15) from immersing into the power motor (3).

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