Hub of electric bicycle

Abstract

The invention discloses a hub of an electric bicycle, comprising a main shaft fixed on a frame. The main shaft is provided with a hub shell by a hub shell bearing; a motor, a planet wheel reducing mechanism and a clutch are arranged in the hub shell; the motor adopts a structure with an inner stator and an outer rotor; a sun gear sleeved on the main shaft is fixed on the rotor; the sun gear is meshed with a planet gear; the planet gear is meshed with a hub inner gear ring fixed on the hub shell; the planet gear is arranged on a planet shaft by a planet bearing; the planet shaft is fixed on the clutch; and the clutch and the frame are fixed with each other. Compared with the prior art, the torsion of the clutch in work is borne by using the frame, the torque force borne by the main shaft is greatly reduced, and thereby, the main shaft is made thin to reduce the tooth number of the sun gear under the premise of ensuring the strength of the main shaft to achieve the goals of increasing the reduction ratio of the sun gear to the hub inner gear ring, further increasing the output torque of the main shaft and reducing the volume of the hub.

Description

technical field [0001] The invention relates to an electric bicycle hub. Background technique [0002] In recent years, electric bicycles have gradually been accepted by consumers as an environmentally friendly and energy-saving means of transportation. Whether at home or abroad, the sales of electric bicycles in the world are also increasing year by year, and the trend of electric bicycles replacing bicycles is gradually expanding. , and the electric bicycle hub is the core component of the electric bicycle, and its quality often determines the overall quality of the electric bicycle. [0003] The Chinese patent No. ZL 200320123400.9 discloses a wheel hub for electric bicycles. The structure of this wheel hub includes a main shaft, and a hub shell is installed on the main shaft through bearings. A motor, a planetary gear reduction mechanism and a clutch are installed in the hub shell. The motor adopts the structure of inner stator and outer rotor. The rotor is fixed with a...

AI Technical Summary

Problems solved by technology

However, in the specific improvement process, the applicant encountered the following problems: In order to obtain a larger output torque, the motor speed must be increased, and the reduction ratio between the sun gear and the inner ring gear of the hub must be increased, but the outer diameter of the hub must be as large as possible. In this case, the number of teeth of the sun gear can only be reduced by reducing the shaft diameter of the main shaft, so as to achieve the purpose of increasing the reduction ratio between the sun gear and the inner ring gear of the hub; but if the main shaft is made thinner, the main shaft will be reduced Strength of

And there is a patent to fix the inner ring of the clutch directly on the main shaft, and the torque generated by the clutch will directly act on the main shaft, so that the main shaft bears a relatively large torque and requires relatively high strength for the main shaft. Once the main shaft is made thinner , it will greatly reduce the overall working reliability and safety of the hub

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