Electric Bicycle Center Axle Torque Sensing Device

Abstract

A central shaft torque sensing device of an electric bicycle, comprising: a central shaft (1) passing through the bottom bracket of a bicycle, a crankset (2) sleeved on the central shaft, and a shaft sleeve (3) sleeved on the central shaft and subject to circumferential deformation under circumferential twisting force; one end of the shaft sleeve is fixed relative to the central shaft, and the other end is fixed relative to the crankset; the shaft sleeve is provided with a torque sensing assembly capable of sensing the magnitude of the circumferential twisting force; a torque signal output line (9) of the torque sensing assembly is connected to a motor controller (26) of the bicycle via a wire lead-out device; the wire lead-out device comprises a movable slide seat (6) and a fixed slide seat (7) fitting and slidable relative to each other; the movable slide seat is fixed to the shaft sleeve, and the fixed slide seat is fixed relative to the bottom bracket; and the torque signal output line of the torque sensing assembly is connected to the movable slide seat, and the fixed slide seat is connected to the motor controller via a torque signal lead-out wire (10). The sensing device has a simple structure and stable performance.

Description

Technical field [0001] The invention relates to an electric bicycle central axle torque sensing device. Background technique [0002] In order to allow the drive motor of the electric bicycle to adjust the output power according to the torsion force received by the central shaft of the bicycle, almost all electric bicycles are equipped with a central shaft torque sensing device. The existing central axle torque sensing devices of electric bicycles generally have disadvantages such as complex structure and large appearance. [0003] The torque signal lead wires of some bicycle bottom axle torque sensing devices are connected to the motor controller of the driving motor through the slip ring, and the slip ring adopts the structure method of dynamic contact with the carbon brush or other contact parts. At this time, there will be sliding friction between the contact piece or carbon brush and the slip ring. Because the contact piece and the slip ring are in point contact, the contact...

AI Technical Summary

Problems solved by technology

Because there is a point contact between the contact piece and the slip ring, the contact area is very small and the pressure is high, so the slip ring is easily scratched after long-term use

Moreover, it is difficult to ensure the contact stability between the contact piece and the slip ring, which directly affects the stability of the torque sensing signal sent by the torque sensing device

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