Hydraulic Bicycle Transmission for Adaptive Chainless Gear Shifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bicycles with mechanical chain gears face difficulties in adapting to rapid road condition changes, leading to user inconvenience, mechanical malfunctions, and environmental exposure issues.
Innovation Solution
A hydraulic automatic transmission bicycle that uses fluid pressure to automatically and adaptively change gear ratios, with all key components housed to prevent erosion, corrosion, and user contact, offering infinitely variable gear ratios and real-time response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical chain gears are used for gear changing, then the structure is simple and easy to manufacture, but the system cannot adapt to rapid road condition changes and suffers from malfunctions due to environmental exposure
Solution Approach 1:
The patent replaces the mechanical chain gear system with a hydraulic transmission system. The hydraulic system uses fluid pressure to transmit power and control gear ratios, eliminating the mechanical chain that is exposed to environmental factors. This substitution resolves the contradiction by maintaining adaptability through hydraulic control while protecting the system from erosion, corrosion, and dirt accumulation.
Solution Approach 2:
The patent employs a hydraulic transmission mechanism where a hydraulic pump generates pressurized fluid that acts on hydraulic motors to drive the wheels. The hydraulic system enables smooth, automatic gear ratio changes in response to road conditions while keeping all critical components enclosed, thus preventing environmental damage and eliminating chain-related malfunctions.
2Extent of automation
If electrical sensors are used to monitor road conditions and wheel rpm, then automatic gear changing can be achieved, but the cost increases and malfunctions become frequent
Solution Approach 1:
The hydraulic transmission system is designed to automatically adjust gear ratios based on inherent system parameters such as fluid pressure and flow rate, which naturally respond to load changes and wheel speed. This self-regulating mechanism eliminates the need for external electrical sensors and complex control systems, thereby achieving automatic gear changing while maintaining high reliability and avoiding sensor-related malfunctions.
Solution Approach 2:
The hydraulic system incorporates inherent feedback mechanisms where changes in fluid pressure and flow automatically reflect changes in wheel speed and road conditions. This passive feedback system enables automatic adaptation without requiring active sensing and electronic control, thus achieving automation while minimizing points of failure.
3Ease of manufacture
If chain gears are exposed to the environment, then the structure is open and accessible, but erosion, corrosion, and dirt entry cause malfunctions
Solution Approach 1:
The hydraulic transmission system is enclosed within a protective housing that seals all critical components. This enclosure prevents dirt, water, and other environmental contaminants from entering the system, thereby eliminating the malfunctions caused by grease degradation and component wear while maintaining manufacturing simplicity through modular design.
4Ease of repair
If user pants contact the chain gear, then the chain may jam, but an open chain structure allows for simpler maintenance
Solution Approach 1:
By replacing the mechanical chain drive with a hydraulic transmission system, the patent eliminates the issue of pants jamming the chain. The hydraulic system uses enclosed fluid power transmission, which cannot be obstructed by clothing. This substitution maintains ease of operation by eliminating interruptions while preserving maintenance accessibility through designed service ports and modular components.
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
The hydraulic automatic transmission bicycle provides seamless gear changes without user intervention, minimizing mechanical failures and environmental exposure, while maintaining efficiency and comfort by adapting to changing road conditions in real-time.
Implementation Method 1
A hydraulic automatic transmission (HAT) bicycle of this disclosure may also include a HAT which in turn includes a hydraulic pump. The HAT may be configured to dispose all (or at least a substantial number of) elements of its driving part inside a housing of the HAT.
Implementation Method 2
The HAT also includes a hydraulic motor which is driven by pressurized fluid which in turn is discharged from an outlet of a hydraulic pump
Data Source
AI summary
This disclosure generally relates to an automatic bicycle, particularly to a hydraulic automatic transmission bicycle which can automatically and adaptively change gear ratios. More particularly, this disclosure relates to those hydraulic automatic transmission bicycles which use fluid pressure to change such gear ratios, and which include various hydraulic automatic transmissions which may be provided in various configurations and may operate in various methods and sequences to provide automatic and infinitely variable gear ratios.