Axially Movable Sprocket Clusters for Bicycle Drivetrain Efficiency
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Solution Overview
Problem
Existing bicycle drivetrain systems experience inefficiencies and increased abrasion due to the mechanical interaction between sprockets and chains, leading to reduced performance and chain holding capabilities.
Innovation Solution
A bicycle driving assembly featuring axially movable sprocket clusters with a motor-driven actuator, allowing for controlled axial movement and positioning of sprocket clusters relative to each other, which reduces wear and enhances chain holding and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixed sprocket clusters are used, then the structure is simple, but driving efficiency is reduced and abrasion increases
Solution Approach 1:
The patent applies the dynamics principle by making the sprocket cluster axially movable rather than fixed. The actuator enables the sprocket cluster to move axially relative to the chain, allowing dynamic adjustment of the engagement position between sprocket teeth and chain links. This dynamic positioning optimizes the meshing interaction, improving driving efficiency while reducing abrasion through controlled movement.
2Reliability
If fixed sprocket positioning is used, then manufacturing is simple, but chain holding capability is reduced
Solution Approach 1:
The actuator mechanism enables dynamic axial positioning of the sprocket cluster to optimize chain engagement. By adjusting the axial position, the system maintains optimal contact between chain links and sprocket teeth, enhancing chain holding capability while preventing slippage and improving overall reliability.
Solution Approach 2:
The patent replaces the traditional fixed mechanical connection with an actuated positioning system. The actuator uses mechanical components (such as threaded rods or lead screws) to convert rotational motion into axial displacement, enabling precise control of sprocket cluster position and thereby improving chain retention.
3Object-affected harmful factors
If conventional sprocket-chain interaction is used, then the system is simple, but abrasion of sprocket and chain increases
Solution Approach 1:
The axially movable sprocket cluster allows dynamic adjustment of the engagement depth and contact points between sprocket teeth and chain links. By optimizing this interaction through controlled axial movement, the system reduces sliding friction and wear, thereby decreasing abrasion of both sprocket and chain components.
Solution Approach 2:
The patent changes the positional parameter of the sprocket cluster along the axial direction. By varying the axial position, the system optimizes the geometric relationship between sprocket teeth and chain pins, reducing contact stress and friction, which directly reduces abrasion and extends component life.
Data Source
AI summary
A bicycle driving assembly is basically provided with a first sprocket cluster, a second sprocket cluster and a first actuator. The first sprocket cluster includes at least one first sprocket configured to be rotatable about a rotational axis. The second sprocket cluster includes at least one second sprocket configured to be rotatable about the rotational axis. The first actuator is configured to move the first sprocket cluster and the second sprocket cluster relative to one another in an axial direction of the rotational axis.