The structure of the electric power assist sensor on the bicycle rear fork

Abstract

The invention discloses a structure of an electric power sensor on a bicycle rear fork. In the invention, one lateral bottom of the bicycle rear fork is provided with a groove, the groove is internally fixed with a circuit board on which a Hall element is arranged, and a sensor assembly arranged on a rear shaft which penetrates through a long slotted hole at the bottom of the groove and is movable is accommodated in the groove; a permanent magnet arranged on the sensor assembly is in magnetic induction match with the Hall element on the circuit board; and the rear shaft is limited to move within the long slotted hole at the bottom of the groove, thus by means of the magnetic induction change between the permanent magnet which is fixed relative to the rear shaft and the Hall element when the rear shaft moves, an electrical signal is output to control the thrust augmentation rotation of a bicycle motor. The invention has the advantages that the bicycle rear fork is fully utilized to serve as the carrier of the sensor, the whole sensor assembly is tactfully accommodated in the groove of the rear fork, the space required by the permanent magnet of the sensor and the Hall element is small, the response effect is good, and the structure is convenient in installation and maintenance.

Description

technical field [0001] The invention relates to the field of bicycle transmission, in particular to a structure of a bicycle electric power assist sensor, Background technique [0002] In the field of bicycle electric power-assisted sensors, Chinese patent ZL03264387.X discloses a "temporal electric power-assisted bicycle sensor", which uses two discs that do not touch each other and rotate with each other to measure the rotation of bicycle wheels. The time difference and sum of the angles are used to indirectly measure the torque applied by the person pedaling and the speed of the bicycle, so as to automatically control the speed of the bicycle; two discs, one is called the moving disc, and the other is called the fixed disc. The moving disc is fixed on the central axis of the bicycle, and the permanent magnetic steel is inlaid on it, and there is no wire connection with the car body. The fixed plate is fixed on the car body, and the Hall element is inlaid on it. The ma...

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Problems solved by technology

[0003] The moving plate in the sensor part of this patent is set on the center shaft, and the fixed plate is set on the car body. There is no contact between the two. Using the principle of magnetic field coordination, the phase difference of magnetic coordination is used to calculate and issue relevant instructions. From the analysis of its mechanical structure , there are the following defects: one is that the setting positions of the moving plate and the fixed plate are far apart, the magnetic induction intensity is relatively weak, and the sensing coefficient is reduced. The requirements for the Hall element and the permanent magnet steel are relatively strict, which improves the production capacity. Cost; the second is that the moving plate and the fixed plate take up a lot of space, the moving plate is combined with the center shaft, and the fixed plate is combined with the car body, and it is inconvenient to work separately during maintenance

The patented sensor part is magnetically fitted around the bicycle brake and the wheel. The magnetic induction part of the sensor is fixed on the brake and the brake arm. The wheel needs to be connected with a magnet for coordination. There are also defects of poor magnetic response sensitivity and low magnetic induction intensity. And the installation is troublesome, and higher requirements are put forward for the machining accuracy of the wheels, which is not conducive to popularization

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