Bilateral mid-axle torque sensor of booster bicycle based on converse magnetostriction effect

A technology of assisting bicycles and inverse magnetostriction, which is applied in the direction of instruments, torque measurement, and vehicle components, can solve the problems of complex mechanical structure, high technical difficulty, and low reliability, and achieve high safety, good repeatability, high precision effect

Pending Publication Date: 2018-06-15
苏州哈工拓普智行科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of complex mechanical structure, low reliability, high cost and high technical difficulty in the existing torque

Method used

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  • Bilateral mid-axle torque sensor of booster bicycle based on converse magnetostriction effect

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Experimental program
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Effect test

specific Embodiment approach 1

[0021] Combine below figure 1 In this embodiment, a torque sensor based on the inverse magnetostrictive effect of a double-sided bottom bracket for a power-assisted bicycle includes a through shaft 1, an elastic sleeve 2, a bottom bracket cover 3, a coil assembly 4, a magnetostrictive coating 5, and a circuit board 6. , Hall sensor 7, bottom cover 8 and multi-stage magnetic ring 9, the through shaft 1 and the elastic sleeve 2 are connected by a key, the elastic sleeve 2 is rotatably connected in the bottom sleeve 3, the through shaft 1 The right end of the shaft is rotatably connected to the bottom end cover 8, the outer surface of the elastic sleeve 2 is coated with a magnetostrictive coating 5, and the cavity between the bottom sleeve 3 and the elastic sleeve 2 is provided with a coil assembly 4 and the circuit board 6, the through shaft 1 is fixedly connected with a multi-stage magnetic ring 9, the Hall sensor 7 is arranged between the multi-stage magnetic ring 9 and the cen...

specific Embodiment approach 2

[0022] Combine below figure 1 This embodiment will be described. This embodiment will further explain the first embodiment. The magnetostrictive coating 5 is arranged on the stressed part of the elastic sleeve 2, and the coil assembly 4 is coaxially arranged on the surface of the elastic sleeve 2 to have magnetostriction. The position of the coating 5, the coil assembly 4 is an excitation coil and a measuring coil, and the magnetostrictive coating 5 and the coil assembly 4 constitute a torque detection unit.

specific Embodiment approach 3

[0023] Combine below figure 1 To illustrate this embodiment, this embodiment will further explain the first or second embodiment. The coil assembly 4 is made of enameled copper wire, and the enameled copper wire is coaxially arranged on the surface of the elastic sleeve 2. In the position of the stretch coating 5, there is insulating paper between two adjacent layers. The measurement principle is: the coil assembly 4 contains two coils, one is an excitation coil and the other is an induction coil. The excitation coil is used for magnetostriction. When the coating is excited, when the magnetostrictive coating deforms with the torque, the electromagnetic induction intensity detected by the induction coil changes, thereby converting the corresponding relationship between the magnetic induction intensity and the current torque; the Hall sensor 7 is used to measure Rotation speed, the Hall sensor 7 is selected because of its firm structure, small size, light weight, long life, easy ...

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Abstract

The invention relates to the technical field of bicycle mid-axle torque detection, in particular to a bilateral mid-axle torque sensor of a booster bicycle based on the converse magnetostriction effect. The sensor includes a through axle, an elastic sleeve, a mid-axle-outer sleeve, a coil assembly, a magnetostriction coating, a circuit board, a Hall sensor, a mid-axle end cover and a multi-stage magnet ring; the through axle is connected with the elastic sleeve through a key, the elastic sleeve is rotatably connected onto the interior of the mid-axle-outer sleeve, the right end of the throughaxle is rotatably connected onto the interior of the mid-axle end cover, the outer surface of the elastic sleeve is coated with the magnetostriction coating, a cavity between the mid-axle-outer sleeveand the elastic sleeve is internally provided with the coil assembly and the circuit board, the through axle is fixedly connected with the multi-stage magnet ring, the Hall sensor is arranged betweenthe multi-stage magnet ring and the mid-axle-outer sleeve, and the output ends of the coil assembly and the Hall sensor are each connected with the input end of the circuit board through a wire. Thesensor solves the problem that in an existing torque sensor, the mechanical structure is complex, the reliability is low, the cost is high, and the technical difficulty is high.

Description

Technical field [0001] The present invention relates to the technical field of torque detection of bicycle central axles, and more specifically to a torque sensor for assisted bicycle bilateral central axles based on inverse magnetostrictive effect. Background technique [0002] With the improvement of China's economic and living standards, people's interest in cycling has rekindled. After the Chinese market has undergone the transformation from bicycles to electric bicycles, electric-assisted bicycles have the advantages of low power consumption and long continuous mileage on a single charge. Is becoming a new development direction. [0003] The most cutting-edge technology in the field of electric bicycles is "torque sensor", also known as "torque sensor". At present, the torque sensors mainly used at home and abroad include inverse magnetostrictive effect, torque displacement conversion scheme, strain gauge detection scheme, torque magnetoresistance conversion Although the solu...

Claims

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Application Information

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IPC IPC(8): B62M6/50G01L3/10
CPCG01L3/101B62M6/50
Inventor 宋文平王长利代礼周张丽
Owner 苏州哈工拓普智行科技有限公司
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