Center shaft torque sensing device of electric bicycle

Abstract

The invention discloses a center shaft torque sensing device of an electric bicycle. The center shaft torque sensing device comprises a center shaft, a crankset and a shaft sleeve. The center shaft is penetratingly arranged in a bottom bracket of the bicycle, the crankset sleeves the center shaft, the shaft sleeve sleeves the center shaft and can peripherally deform when under peripheral torsional force, one end of the shaft sleeve is fixed relative to the center shaft, the other end of the shaft sleeve is fixed relative to the crankset, a torque sensing assembly capable of sensing the magnitude of the peripheral torsional force on the shaft sleeve is arranged on the shaft sleeve, a torque signal output wire of the torque sensing assembly is connected with a motor controller of the bicycle by a wire outlet device, the wire outlet device comprises a movable slide seat and a fixed slide seat which can be in contact with each other in a clinging manner and can relatively slide, the movable slide seat is fixed to the shaft sleeve, the fixed slide seat is fixed relative to the bottom bracket of the bicycle, the torque signal output wire of the torque sensing assembly is connected with the movable slide seat, and the fixed slide seat is connected with the motor controller by a torque signal lead wire. The center shaft torque sensing device has the advantages of simple structure and stability in performance.

Description

technical field [0001] The invention relates to a torque sensor device for the center shaft of an electric bicycle. Background technique [0002] In order to allow the driving motor of the electric bicycle to adjust the output power according to the torsion force on the central axis of the bicycle, almost all electric bicycles are equipped with a central axis torque sensor device. The existing center shaft torque sensing devices for electric bicycles generally have disadvantages such as complex structures and bulky shapes. [0003] The torque signal lead-out line of some bicycle center shaft torque sensing devices is connected to the motor controller of the driving motor through the collector ring, and the collector ring adopts the structure of dynamic contact between the slip ring and the carbon brush or other contact parts. Sliding friction occurs between the contact piece or the carbon brush and the slip ring. Because there is point contact between the contact piece and...

AI Technical Summary

Problems solved by technology

Because there is a point contact between the contact piece and the slip ring, the contact area is very small and the pressure is high, so the slip ring is easily scratched after long-term use

Moreover, it is difficult to ensure the contact stability between the contact piece and the slip ring, which directly affects the stability of the torque sensing signal sent by the torque sensing device

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