PROBLEM TO BE SOLVED: To solve the following problem:it is a mainstream conventionally that a tread force sensor and a drive motor are integrated and arranged on the lower part of a crank shaft of a body frame of a bicycle because power assisted bicycles have been disseminated and more refined design and functions are sought after, and the tread force sensor is required to be compact and high in functionality.SOLUTION: In the structure in which a hollow shaft 4 is connected to a crank shaft 2 of a bicycle in a penetration manner and a chain wheel 3 is fixed to the other end of the hollow shaft 4, a secondary coil 6 and a strain gauge 8 are fixed to an outer periphery of the hollow shaft. In addition, a sensor case 5 is arranged in the outside of the hollow shaft 4, and a primary coil 7 is placed in the inside thereof, and both the sensor case and the primary coil are allowed to rotate without contacting with each other, thereby using the hollow shaft 4 as a rotary transformer. The primary coil side is provided with a load resistance 12 in series with the coil, and a power consumption state on the side of the secondary coil 6 can be acquired as a primary coil current also by applying an AC signal 13 to the primary coil 7. When the tread force is applied to the pedal, a strain gauge resistance is changed and the power consumption is changed. This leads to the current change of the primary coil. The voltage at both ends of the load resistance 12 is proportional to the tread force.

    【課題】 電動アシスト自転車の普及により、より洗練されたデザインや機能の追及から、踏力センサーと駆動モーターを一体化し自転車車体のクランク軸下部に置く配置が主流になっており、踏力センサーには小型で機能性の高いものが要求されている。【解決手段】 自転車のクランク軸2に中空軸4を貫入接合し、中空軸4の他端にはチェーンホイール3を固定した構造に於いて、中空軸外周に二次コイル6と歪みゲージ8を固定している。また、センサーケース5を中空軸4の外側に配し、その内部に一次コイル7を置き、相互に接触しないで回転できるように構成する事で、中空軸4をコアとするロータリートランスとしている。一次コイル側にはコイルと直列に負荷抵抗12が入っており、一次コイル7に交流信号13を加える事で二次コイル6側の電力消費状況が一次コイル電流としても把握できる。ペダルに踏力が掛かると歪みゲージ抵抗が変化して電力消費が変わり、この事に因り一次コイルの電流変化となる。負荷抵抗12両端の電圧は踏力に比例する。【選択図】図1


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    Title :

    TREAD FORCE DETECTION SENSOR


    Additional title:

    踏力検知センサー


    Contributors:

    Publication date :

    2015-11-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G01L Messen von Kraft, mechanischer Spannung, Drehmoment, Arbeit, mechanischer Leistung, mechanischem Wirkungsgrad oder des Drucks von Fluiden , MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE / B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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