Telescopic Seatpost Valve Structure for Low-Force Height Adjustment
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Solution Overview
Problem
Existing fluid flow control systems for telescopic apparatuses in human-powered vehicles, such as bicycles, require high operating forces to adjust the height of the telescopic apparatus, which can be cumbersome and inefficient for users.
Innovation Solution
A fluid flow control structure comprising a first tube, a second tube, and a positioning structure with a valve system that includes a first fluid chamber, a second fluid chamber, and a third fluid chamber with compressible fluid, which reduces the operating force required to change the height by biasing the valve body towards the valve seat, improving closing performance and sealing, and using an actuator to switch between closed and open states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional fluid flow control system is used to adjust the telescopic apparatus height, then the height can be changed, but high operating force is required which makes it cumbersome and inefficient
Solution Approach 1:
The fluid control system is segmented into three separate fluid chambers (first, second, and third chambers) with distinct functions. The first and second chambers handle the main hydraulic fluid for height adjustment, while the third chamber contains compressible fluid specifically for reducing operating force and improving valve sealing. This segmentation allows each chamber to be optimized for its specific function without compromising the others.
Solution Approach 2:
The system changes the physical parameter of the fluid from incompressible (in the first and second chambers) to compressible (in the third chamber). This parameter change allows the third chamber to absorb pressure variations and provide a cushioning effect that reduces the operating force required to move the valve body while maintaining reliable sealing through the compressible fluid's ability to adapt to pressure changes.
2Reliability
If high operating force is applied to adjust the telescopic apparatus, then the height can be changed, but the valve closing performance deteriorates due to insufficient sealing
Solution Approach 1:
The compressible fluid in the third chamber acts as an intermediary between the hydraulic system and the valve body. It provides a cushioning effect that facilitates smooth valve closing by reducing the impact of pressure variations and ensuring the valve body seats properly against the valve seat, thereby improving sealing performance without requiring excessive operating force.
Solution Approach 2:
The third fluid chamber with compressible fluid provides beforehand cushioning for the valve closing operation. The compressible fluid absorbs and dampens pressure fluctuations before they reach the valve body, ensuring that the valve closes smoothly and seals reliably without requiring high operating forces that could damage the sealing surfaces.
3Device complexity
If a simple fluid chamber design is used, then the device complexity is reduced, but the ability to maintain selected height and reduce operating force is compromised
Solution Approach 1:
Instead of using a single complex fluid chamber, the system segments the fluid control into three simpler chambers with distinct functions. Each chamber has a specific role: the first and second chambers manage hydraulic fluid for height adjustment, while the third chamber handles compressible fluid for force reduction. This segmentation simplifies the design of each individual chamber while achieving the overall complex function through their combination.
Solution Approach 2:
The three-fluid chamber system provides multi-functionality within a unified structure. The first and second chambers work together for height adjustment, while the third chamber simultaneously provides both operating force reduction and valve closing assistance. This multi-functional design achieves multiple benefits without requiring separate complex systems for each function.
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 fluid flow control structure significantly reduces the operating force needed to adjust the height of the telescopic apparatus, enhances sealing performance, and maintains a selected height, making it easier and more efficient for users to adjust the bicycle seat height.
Implementation Method 1
The third fluid chamber includes a compressible fluid. The third fluid chamber is configured such that the compressible fluid biases the valve body toward the valve seat in the open state.
Implementation Method 2
The first and second fluid chambers include an incompressible fluid.
Data Source
AI summary
A fluid flow control structure is provided for a telescopic apparatus of a human powered vehicle. The fluid flow control structure basically comprises a first tube, a second tube and a positioning structure. The second tube is telescopically coupled to the first tube to move in an axial direction. The positioning structure includes first, second and third fluid chambers, and a valve that defines a port that is selectively opened and closed. The valve includes a valve body that is movable relative to a valve seat in the axial direction to change a valve state between a closed state and an open state. The valve body fluidly separates the first and second fluid chambers in the closed state and to fluidly connect the first and second fluid chambers in the open state. The third fluid chamber includes a compressible fluid.