Bicycle Seat Post Fluid Venting for Gas Ingress
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Solution Overview
Problem
Hydraulic systems in bicycle seating assemblies are prone to performance degradation due to the ingress of compressible gases, which can lead to inefficient energy transfer and stability issues during operation.
Innovation Solution
A fluid device is introduced that includes a support chamber containing non-compressible fluid, a reservoir with a compressible fluid, and an actuation valve with a flow device that allows permeability to gases while maintaining the non-compressibility of the hydraulic fluid, effectively venting gases and maintaining system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic locking mechanism is used to support the seating assembly, then positive support and stability are provided, but compressible gases can ingress into the system causing performance degradation
Solution Approach 1:
A flow device is introduced as an intermediary component between the hydraulic system and the external environment. This flow device selectively permits compressible gases to pass through while blocking incompressible hydraulic fluid, thereby mediating the interaction between the hydraulic system and potential gas sources to prevent gas ingress while maintaining system stability
Solution Approach 2:
The flow device utilizes porous material properties to achieve selective permeability. The porous structure allows compressible gases to permeate through while the surface tension and viscosity characteristics of the hydraulic fluid prevent it from passing through the porous medium, thus preventing gas ingress while maintaining hydraulic integrity
2Ease of operation
If the seating assembly is designed for quick adjustment during operation, then user control is improved, but the system becomes more complex with additional actuation mechanisms
Solution Approach 1:
The seating assembly incorporates a self-service mechanism where the rider's body weight and natural movements automatically actuate the height adjustment. When the rider shifts position or applies weight to the saddle, this triggers the height adjustment mechanism without requiring separate controls, buttons, or complex electronic systems
Solution Approach 2:
The system uses hydraulic or pneumatic principles to enable smooth, controlled height adjustment. A movable piston or diaphragm responds to pressure changes caused by rider movement, automatically adjusting the saddle height through fluid pressure transmission, eliminating the need for mechanical linkages or electronic actuators
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
This solution enhances the stability and efficiency of the bicycle seating assembly by preventing gas ingress, ensuring consistent performance and efficient energy transfer to the drivetrain, reducing the need for frequent maintenance and improving user control.
Implementation Method 1
a flow device permeable to the gaseous fluid and substantially impermeable to the liquid fluid
Data Source
AI summary
A fluid device for a bicycle may be provided to vent fluid from a hydraulic chamber of a seating component such as an adjustable seating assembly for a bicycle. The fluid device may be operable to vent a compressible fluid or a mixed combination flow of compressible and non-compressible fluids in a metered volume. The fluid device may recycle fluids preferentially.