Spring-Loaded Bicycle Transmission for Automatic Torque Ratio Adjustment
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Solution Overview
Problem
Bicyclists seek easy and automatic gear shifting to balance input and output forces based on varying conditions like ground inclination and weight, which existing systems fail to address efficiently.
Innovation Solution
An automatic transmission system for bicycles that adjusts torque ratio through spring-loaded mechanisms, allowing sprockets to expand or contract diametrically in response to changing drive forces, eliminating the need for manual input and traditional gear components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual gear shifting is used, then the system structure remains simple, but the ease of operation deteriorates due to the need for constant manual intervention
Solution Approach 1:
The transmission system automatically adjusts gear ratios based on ride conditions without requiring manual intervention. The spring-loaded sprockets self-adjust their diameter in response to varying drive forces, enabling the system to serve itself and eliminating the need for manual gear shifting.
Solution Approach 2:
The sprockets are designed with dynamic diameter adjustment capability through spring-loaded mechanisms. The sprocket diameter changes continuously in response to varying drive forces, allowing the transmission system to adapt dynamically to different riding conditions such as changes in terrain, speed, and load.
2Adaptability or versatility
If traditional fixed-ratio sprockets are used, then the device complexity is low, but the adaptability to varying terrain and load conditions deteriorates
Solution Approach 1:
The sprockets are designed with dynamic diameter adjustment capability through spring-loaded mechanisms. The sprocket diameter changes continuously in response to varying drive forces, allowing the transmission system to adapt dynamically to different riding conditions such as changes in terrain, speed, and load.
Solution Approach 2:
The transmission system changes the physical parameter of sprocket diameter in response to varying drive forces. As drive force increases, the spring mechanism causes the sprocket diameter to decrease, automatically adjusting the gear ratio to optimize performance for the current riding conditions.
3Extent of automation
If automatic adjustment mechanisms are added, then the ease of operation improves, but the device complexity increases due to additional components
Solution Approach 1:
The transmission system automatically adjusts gear ratios based on ride conditions without requiring manual intervention. The spring-loaded sprockets self-adjust their diameter in response to varying drive forces, enabling the system to serve itself and eliminating the need for manual gear shifting.
Solution Approach 2:
The patent replaces complex electronic or hydraulic automatic transmission systems with a purely mechanical spring-loaded sprocket design. The spring mechanism directly translates drive force variations into diameter adjustments, eliminating the need for sensors, actuators, or control systems while achieving automatic adaptation.
4Adaptability or versatility
If the sprocket pattern expands and contracts dynamically, then the adaptability improves, but the reliability may deteriorate due to moving parts under varying stress
Solution Approach 1:
The spring mechanism acts as a counterbalancing element that continuously applies a force opposing the drive force. This creates a balanced system where the spring force increases as the sprocket diameter decreases, providing a stabilizing effect that maintains reliable operation across the full range of dynamic adjustments.
Solution Approach 2:
The spring mechanism provides cushioning by absorbing and releasing energy during diameter transitions. The spring gradually stores and releases mechanical energy during expansion and contraction, reducing shock loads and preventing sudden jerks that could compromise reliability during rapid gear ratio changes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides seamless gear ratio adjustments without manual intervention, ensuring optimal performance across varying terrains and loads, enhancing ease of operation and efficiency.
Implementation Method 1
one or more mechanisms providing a spring force bias
Implementation Method 2
The one or more mechanisms may provide a spring force bias which biases the pattern of sprockets toward one of either diametric expansion or diametric contraction
Data Source
AI summary
Bicycles and automatic transmission mechanisms for bicycles including a rotor plate, a main structure in which the rotor plate and the main structure are coaxial and configured to counter-rotate relative to each other, a plurality of arms in a substantially evenly spaced radial pattern including a plurality of gear teeth, and a plurality of compression springs, in which increasing drive force causes the rotor plate to counter-rotate relative to the main structure and the plurality of compression springs provide an increasing resistance force to counter-rotation of the rotor plate relative to the main structure by compressing further as drive forces increase, and decreasing drive force allows the plurality of compression springs to decompress and counter-rotate the rotor plate in an opposite direction relative to the main structure.