Seat Post Pressure Relief Valve for Hydrostatic Lock Prevention
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Solution Overview
Problem
Conventional bicycle seat posts experience hydrostatic lock conditions during extreme conditions, such as high temperatures or sudden terrain changes, leading to temporary non-functionality of surrounding components due to increased pressure in the oil chamber.
Innovation Solution
An infinite adjust seat post with a pressure relief valve is introduced, which strategically positions the valve in series with a spool valve to harness increased pressure and open a pathway for oil to relieve pressure, preventing hydrostatic lock by allowing fluid to transfer from one side of the main piston to the other, thus maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil chamber is sealed to maintain suspension function, then suspension reliability is improved, but hydrostatic lock occurs under extreme conditions causing non-functionality
Solution Approach 1:
A pressure relief valve is introduced as an intermediary component between the sealed oil chamber and the external environment. The valve includes a valve body with a flow port and a valve member that can open under pressure to release excess oil, preventing hydrostatic lock while maintaining normal suspension sealing. This mediator allows the system to achieve both reliability under normal conditions and pressure relief under extreme conditions.
Solution Approach 2:
The system changes the pressure parameter dynamically by introducing a pressure relief valve that activates when pressure exceeds a threshold. The valve member responds to pressure changes by moving between closed and open positions, thereby adjusting the system pressure parameter to prevent hydrostatic lock while maintaining proper suspension function during normal operation.
2Force
If the flow port is blocked to maintain oil pressure, then suspension support is improved, but adjustability is lost due to hydrostatic lock
Solution Approach 1:
The flow port transitions from a static blocked state to a dynamic state where it can open and close based on pressure conditions. The valve member moves dynamically in response to pressure changes, allowing the flow port to be blocked during normal operation for proper suspension support, and open during extreme conditions to prevent hydrostatic lock and maintain adjustability.
Solution Approach 2:
The pressure relief valve acts as an intermediary mechanism that controls the flow port's opening and closing. It mediates between the need for blocked flow (for suspension support) and the need for open flow (for pressure relief and adjustability), automatically transitioning between states based on pressure conditions without requiring external intervention.
3Reliability
If the valve is positioned to relieve pressure from portion A, then hydrostatic lock prevention is improved, but oil transfer efficiency to portion B may be affected
Solution Approach 1:
The pressure relief valve extracts excess pressure from portion A of the oil chamber by providing a dedicated relief pathway. The valve is strategically positioned to relieve pressure from portion A, which is the portion that experiences hydrostatic lock, while maintaining proper oil transfer to portion B through coordinated valve timing and positioning.
Solution Approach 2:
The system converts the harmful high pressure condition in portion A into a beneficial triggering mechanism for the pressure relief valve. When pressure becomes excessively high (harmful condition), it automatically opens the relief valve, which then facilitates oil transfer to portion B (beneficial outcome), thereby preventing hydrostatic lock while maintaining overall system productivity.
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 pressure relief valve effectively reduces pressure within the oil chamber, allowing the piston rod to move and preventing hydrostatic lock, ensuring continuous adjustability and functionality of the seat post across various riding conditions.
Implementation Method 1
harness increased pressure and open a pathway for oil to relieve pressure, preventing hydrostatic lock by allowing fluid to transfer from one side of the main piston to the other
Data Source
AI summary
An assembly for enabling continuous seat post function during extreme conditions is described and includes: a first valve at least partially, slidably disposed within a stationary piston and for controlling a first fluid pathway there through, wherein the first fluid pathway runs from a first portion and to a second portion of the oil chamber, wherein the stationary piston separates the oil chamber into the first portion and the second portion; and a second valve at least partially disposed within the stationary piston and disposed in series with the first valve and having a second fluid pathway disposed through the first valve and the second valve, being in parallel with the first fluid pathway, running from the first portion to the second portion of the oil chamber, and providing a bypass for oil to flow from the first portion to the second portion when the first fluid pathway is closed.