Bicycle Seatpost Fluid Flow Control Structure
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Solution Overview
Problem
Conventional fluid flow control structures in bicycle seatpost assemblies face challenges in reducing resistance and enhancing the ease of movement, leading to increased effort required for adjusting the seatpost length and elevating speed.
Innovation Solution
A fluid flow control structure comprising a fluid chamber with a tube member and a piston, featuring a minimum fluid passage with an aperture rate of 0.1 or greater, and a port that adjusts the aperture rate, allowing for reduced resistance and easier movement by minimizing the force needed to move the tube member relative to the piston.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the fluid passage area is increased to reduce resistance, then the fluid flow resistance decreases, but the device structure becomes more complex
Solution Approach 1:
The fluid passage is segmented into multiple sections with different aperture rates. The minimum aperture rate is set to 0.1 or greater, and the maximum aperture rate is set to 0.6 or less. This segmentation allows different parts of the fluid passage to have optimized flow characteristics without requiring a complete redesign of the entire passage structure.
Solution Approach 2:
Different sections of the fluid passage are given different local qualities through varying aperture rates. The minimum aperture rate section (0.1 or greater) provides stable flow control, while the maximum aperture rate section (0.6 or less) allows for higher flow capacity when needed. This local differentiation resolves the contradiction by providing both low resistance and structural simplicity in different locations.
2Speed
If the pressure of the air spring is increased to increase elevating speed, then the elevating speed increases, but the pushing-down force required increases
Solution Approach 1:
The aperture rate parameter is changed and optimized within specific ranges (minimum 0.1, maximum 0.6) to improve fluid flow efficiency. This parameter optimization allows the system to achieve higher elevating speeds through improved flow dynamics rather than simply increasing pressure, thereby reducing the pushing-down force required while maintaining or improving elevating speed.
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 solution reduces the resistance in the fluid flow, enabling smoother and faster adjustment of the seatpost without increasing pressure, thus enhancing the elevating speed and reducing the pushing-down force required.
Implementation Method 1
the fluid flow control structure is capable of reducing resistance of the fluid flow to the fluid passage
Data Source
AI summary
A fluid flow control structure for a bicycle device comprises a fluid chamber structure and a piston. The fluid chamber structure includes a tube member at least partly defining a first chamber, a third chamber, and a fluid passage for changing volumes of the first chamber and the third chamber. The tube member has a longitudinal axis. The fluid passage includes a minimum fluid passage. The piston is movably disposed in the tube member in a telescopic direction of the longitudinal axis. An aperture rate is defined by dividing an area of the minimum fluid passage by a flow rate. The flow rate is defined by fluid volume passing through the minimum fluid passage as the tube member moves relative to the piston at 1.0 mm. The aperture rate is equal to or greater than 0.1.