Electric bicycle wheel disc for non-contact power torque measurement

Abstract

The invention discloses an electric bicycle wheel disc of non-contact power supply torque measurement. The invention is realized through the following technical plan: a measurement device is arranged between the wheel disc and a bottom bracket, and comprises a fixed ring body and a rotary ring body; the fixed ring body consists of a fixed ring for a rotary transformer, a fixed coil for the rotarytransformer, and a fixed ring; the rotary ring body consists of a rotary ring for the rotary transformer, a rotary coil for the rotary transformer, and a rotary ring; the rotary ring for the rotary transformer is internally and adjacently provided with a measurement circuit; the periphery of the wheel disc is provided with four resistance strain gauges, and the four resistance strain gauges form a strain bridge and is connected with the measurement circuit. In the premise of satisfying high precision measurement, the electric bicycle wheel disc of non-contact power supply torque measurement reduces the cost for the non-contact torque measurement without changing the general standard parts in the bicycle industrial system.

Description

technical field [0001] The invention relates to the field of electric bicycle products, more specifically, relates to a wheel disc of an electric bicycle for non-contact power supply torque measurement. Background technique [0002] At present, electric bicycle products are more and more recognized by the international community, but some countries have strict ratio requirements for electric bicycle pedal force and electric driving force. This requires that the pedal drive system of the electric bicycle has a mechanism for measuring torque. At present, several companies in Japan have mature technologies in the measurement of electric bicycle pedal torque, and their technologies and products are in a monopoly position internationally. [0003] Judging from the information we can find and the physical samples we can collect, there are many measurement methods at home and abroad, roughly classified as follows: [0004] 1. A method for measuring the pedal torque by using the d...

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages: poor measurement accuracy; fatigue of elastic elements; poor batch consistency; complex mechanical parts and high cost; mechanical parts are easy to wear

However, there are the following disadvantages: the temperature drift of the force-sensitive magnetic material is relatively large, and temperature compensation is required; the process cost of the force-sensitive magnetic material is high; the cost of mechanical components is relatively high

[0010] Although the third method has high measurement accuracy, it has the following disadvantages: the cost of mechanical components is relatively high; the electrical signal transmission mechanical components are complicated; the bicycle components that cooperate with the measurement components need to be changed accordingly

Poor waterproof performance

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