Central-shaft torque sensing device for electric bicycle

Abstract

The invention discloses a central-shaft torque sensing device for an electric bicycle. The central-shaft torque sensing device comprises a central shaft assembled in a five-way tube via a bearing, cranks fixed on the central shaft, a chain wheel sleeved on the central shaft, and an elastic torsion member connected with the central shaft and the chain wheel, wherein left and right torque sensing magnetic steel capable of generating peripheral relative displacement during the torsion of the elastic torsion member are fixed on the elastic torsion member; a magnetic induction coil wrapping the left and right torque sensing magnetic steel is further sleeved outside the elastic torsion member and is electrically connected with a motor control circuit board via a circuit board between the central shaft and the inner wall of the five-way tube; and the motor control circuit board is electrically connected with a motor of the electric bicycle. The device is high in induction sensitivity and accuracy, and capable of accurately detecting torque signals transmitted by the left crank and the right crank in a non-contact manner via a magneto-electricity conversion mode.

Description

technical field [0001] The invention relates to a component of an electric bicycle, in particular to a torque sensor device for the center shaft of the electric bicycle. Background technique [0002] Electric bicycles are being increasingly used in my country because of their brisk, labor-saving and pollution-free characteristics. Traditional electric bicycles use the handle to adjust the speed, that is, use the handle to control the output power of the motor. At present, more and more electric bicycles mainly use torque sensors to convert the pedaling force of the foot when riding into a corresponding The voltage signal output is amplified by the motor control circuit board to control the operating power of the motor, which can greatly save energy. [0003] At present, most of the sensors used in electric bicycles are Hall speed sensors. This kind of sensor uses magnetic steel to paste on the surface of rotating parts such as the center shaft or flywheel of the electric bi...

AI Technical Summary

Problems solved by technology

[0004] 1. The static and dynamic torque cannot be detected, the measurement accuracy is poor, and it cannot be zero-started during riding. When riding on flat roads and downhill, the electric power assist will be too large, which will cause unnecessary discharge of the battery.

[0005] 2. Since the magnetic steel is not installed on the effective force-bearing part of the central shaft, the displacement change caused by the torsion is not obvious, and it is often obvious at low speeds, but not at high speeds, so the induced potential signal The output is inaccurate, and the working stability and reliability of the sensor are greatly reduced

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