Centrally-mounted drive system of electric bicycle

Abstract

A centrally-mounted drive system of an electric bicycle comprises a chain wheel, a motor, a middle shaft and a reduction box, wherein the chain wheel has a disc-shaped structure; a concave circular mounting part is arranged in the middle position of the chain wheel; a housing of the reduction box is arranged in the concave mounting part and matched with the chain wheel; a reducing mechanism in the reduction box is a composite dual-overrun clutch, wherein the inner ring of an outer clutch and the outer ring of an inner clutch share the same component which serves as the output end of a hybrid power source; and the inner ring of the outer clutch is coaxially fixed to the chain wheel. The centrally-mounted drive system of the electric bicycle employs coaxial mounting, coaxial output and single-stage helical gear parallel transmission manners and successfully avoids great change of a frame caused by lift mounting; the single-stage reducing mechanism is employed to realize coaxial output; the volume of the motor is effectively reduced, which has little influence on the appearance of the entire bicycle; and viewed from the angle of the appearance of the entire bicycle, the similarity of the electric bicycle to the bicycle is very high.

Description

technical field [0001] The present invention relates to the technical field of electric bicycles, in particular to an electric bicycle with a single-point coaxial installation between the vehicle frame, coaxial output and single-stage helical gear parallel transmission, thereby reducing the volume of the reduction box and the motor. Set the drive system. Background technique [0002] At present, the number of electric bicycles in China has exceeded 160 million, becoming the veritable number one means of transportation. Almost all existing electric bicycles in China are driven by hub motors. The wheel hub motor is divided into the hub direct drive form and the deceleration form. The hub direct drive form is basically installed on the rear wheel of the electric bicycle. This type of motor has a large weight, large volume, large electromagnetic noise, and large riding resistance. Due to the use of a large number of magnetic materials , the manufacturing cost is relatively hig...

AI Technical Summary

Problems solved by technology

However, the design difficulty of the mid-mounted drive system of this structure is relatively low

[0010] Among the above-mentioned drive output forms, the coaxial output is the most reasonable force output structure. However, in the current similar products in the domestic and foreign markets, the deceleration system is multi-stage deceleration or planetary gear deceleration. The deceleration system has a complex structure and the volume of the deceleration body Huge, it has a big impact on the appearance of the bike

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