Bicycle CVT Variator Gearbox for Automatic Speed Control
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Solution Overview
Problem
Existing bicycles with manual gearshift mechanisms face issues such as chain throwing, frequent breakdowns of gear shifting parts, and inadequate speed control, making them less efficient for urban transportation in high-traffic areas.
Innovation Solution
An automatic CVT variator transmission system that increases or decreases the rotational speed of the pedals, utilizing a gearbox with a CVT mechanism, pulleys, and a belt system driven by sliding weights to adapt to varying speeds, allowing for continuous variable gear ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manual gearshift mechanism is used in bicycles, then the structure is simple and easy to manufacture, but it causes chain throwing, frequent breakdowns of gear shifting parts, and inadequate speed control
Solution Approach 1:
The patent replaces the traditional manual mechanical gearshift mechanism with an automatic CVT (Continuously Variable Transmission) system that uses a variator mechanism with friction-based pulleys and belts, eliminating the need for manual shifting and traditional gear components, thereby resolving chain throwing and gear breakdown issues
Solution Approach 2:
The CVT variator system automatically adjusts transmission ratios based on rotational speed without requiring manual intervention, with the mechanism self-regulating through centrifugal force and spring-loaded pulleys that respond to speed changes, eliminating the need for manual gear shifting operations
2Adaptability or versatility
If a traditional gear system is used in bicycles, then the device complexity is low, but it cannot provide continuous variable gear ratios and adequate speed control
Solution Approach 1:
The patent implements a dynamic transmission system where the variator pulleys can continuously change their effective diameter during operation, allowing the transmission ratio to vary continuously rather than in discrete steps, enabling adaptive speed control that responds to changing riding conditions
Solution Approach 2:
The CVT system changes the physical parameters of the transmission by varying the contact diameter of the pulleys through mechanical adjustment, allowing continuous modification of the transmission ratio parameter to optimize performance across different speed ranges and loading conditions
3Speed
If the rotational speed from pedals is directly transmitted, then the transmission system is simple, but it cannot achieve high-speed output required for efficient bicycle operation
Solution Approach 1:
The patent divides the transmission function into multiple stages using a two-pulley variator system with separate drive and driven pulleys, each capable of independent diameter adjustment, allowing progressive speed multiplication while maintaining continuous variability in the transmission ratio
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 efficient and automatic speed control for bicycles, enhancing their usability in urban environments by reducing manual shifting issues and improving speed management, thus overcoming the limitations of traditional bicycle gear systems.
Implementation Method 1
The rear half includes a spring that rotates the pulley downward when the system speed drops
Implementation Method 2
a belt system driven by sliding weights to adapt to varying speeds
Data Source
AI summary
A CVT variator transmission box for using on a bicycle is provided. The CVT variator transmission box increases or decreases a speed of a rotation of pedals or hands when a form of a motion transmission is provided; and the CVT variator transmission box introduces a new variator gearbox with a CVT variator transmission mechanism capable of transmitting to a front wheel or a rear wheel by increasing or decreasing the speed from the pedals or the hands when the form of the motion transmission is provided. The CVT variator transmission box is positioned on any part of the front wheel, the rear wheel or on a frame of the bicycle.