Rear grappling hook structure of bicycle with tread force sensor and manufacturing method thereof

Abstract

The invention relates to a rear grappling hook structure of a bicycle with a tread force sensor and a manufacturing method thereof. The manufacturing method comprises the following steps of providing a rear grappling hook body, carrying out stress analysis and arranging a strain gauge. The strain gauge is used for sensing stress generated by tread force, and the bicycle is provided for signal processing and outputting digital control signals to an automatic gear shift device or an electric motor device. Through the tread force sensing device, tread force values consistent with the forward direction can be correctly read, the tread frequency of the bicycle can be further sensed, and the tread force values and the tread frequency are used as control signals of the automatic gear shift device and the electric motor device, and the effect of precise gear shifting and correct speed control is achieved.

Description

technical field [0001] The invention relates to a rear claw hook structure of a bicycle with a pedal force sensor and a manufacturing method thereof. Background technique [0002] Most of the pedaling force detection methods of the existing known bicycle pedaling force sensing devices use Hall sensing elements to detect the stress transmitted from the pedaling on the bicycle frame. In U.S. Patent US2011 / 0040500A1, a method of measuring pedaling force is proposed, which is to concentrate the measurement position on the frame of the bicycle (such as on the FIG1 rear frame, FIG2 right rear fork and as in the specification [0003]-[ 0011] paragraph). However, due to the excessive noise of the overall frame, it is difficult to return to zero, and the deformation of the overall frame due to the pedaling force spreads throughout the entire frame, so the position where the sensing component is attached may not be able to detect the generated stress and the stress change signal. On ...

AI Technical Summary

Problems solved by technology

However, due to the excessive noise of the overall frame, it is difficult to return to zero, and the deformation of the overall frame due to the pedaling force spreads throughout the entire frame, so the position where the sensing component fits may not be able to detect the generated stress and stress change signals

On the other hand, because there are many moving parts around the detection part, it is difficult to adjust the problem.

[0003] And in U.S. Patent No. 7814800B2, also propose a kind of measuring method of pedaling force, but the design of its back claw hook is formed in the mode of flexible cutting like the bicycle pedaling force sensing device body that develops now (as shown in FIG3A-FIG8B ), which cannot avoid the spring-like effect, the signal returned by the induction device body will actually be very chaotic, and will form a lot of invalid signals and echo signals, which will greatly reduce the detection quality and accuracy

When this shortcoming is applied to speed control, it is very easy to cause a problem of riding safety for bicycle riders

[0004] In addition, the amount of deformation of the body of the bicycle pedal force sensing device formed by torsion cutting is determined by the body of the bicycle frame. Every bicycle is different, and it is more complicated if the material is different.

And the direction of its deformation is often inconsistent with the tension direction of the chain, it is difficult to obtain correct stress data for application

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