Piston direct drive electric control tooth disc mechanism, transmission system and bicycle

By actively adjusting the angle between the chain, chainring, and freewheel through a piston-driven electronic chainring mechanism, the problem of ineffective dissipation of chain drive force in traditional bicycle gear systems is solved, thereby improving riding efficiency and stability.

CN224448064UActive Publication Date: 2026-07-03HUNAN SUAO TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUNAN SUAO TECH CO LTD
Filing Date
2025-06-27
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In traditional bicycle gear systems, the non-parallel angle between the chain, freewheel, and chainring causes ineffective dissipation of chain driving force, affecting riding efficiency and easily leading to problems such as chain drop, tooth wear, and deformation.

Method used

It adopts a piston direct drive electronically controlled chainring mechanism, which actively adjusts the position of the piston and chainring through an electronically controlled drive mechanism, reducing the angle between the chain, chainring, and freewheel. It uses a ring piston and bottom bracket structure to achieve precise meshing between the chain and teeth, improving riding efficiency and extending component life.

Benefits of technology

Improve riding efficiency, reduce chain slippage and tooth wear, extend bicycle lifespan, and enhance riding stability and smoothness.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application discloses a piston direct-drive electronically controlled chainring mechanism, a shifting system, and a bicycle. The piston is configured as a ring structure, with the bottom bracket passing through it and fixed relative to the piston in the circumferential direction. When the pedal drives the bottom bracket to rotate, the bottom bracket drives the piston to rotate, which in turn drives the chainring to rotate. When the freewheel shifts gears, the electronically controlled drive mechanism can actively drive the piston to move axially, and synchronously adjust the position of the chainring, thereby reducing the angle between the chain, chainring, and freewheel, and improving riding efficiency. The reduced angle expands the meshing range between the chain and the teeth, reducing chain slippage, asymmetrical wear, and axial force, lowering the risk of tooth deformation, and extending the service life of components. Compared to the traditional passive adjustment method of the chain driving the chainring, the embodiment of this application uses an electronically controlled drive mechanism for active control, resulting in smoother and more precise chainring movement, avoiding jamming, and ensuring stable positioning after reaching the correct position, thus improving riding stability.
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