Bicycle Suspension Damper With Dual Compression Valves
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Solution Overview
Problem
Existing bicycle suspension components often experience delays in shock absorption due to cracking pressures, leading to a stick-slip feel and inadequate damping of high-frequency vibrations, particularly when encountering rough terrain.
Innovation Solution
A damper design with a piston that includes a bypass compression flow path and a primary compression flow path, where a second check valve with a lower cracking pressure allows fluid flow through the bypass path during the initial compression stroke, followed by a primary check valve opening during the second portion of the stroke, providing varying levels of damping based on the damper's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single check valve with high cracking pressure is used in the compression port, then the damper provides sufficient damping force, but the response time is delayed and high-frequency vibrations are not adequately damped
Solution Approach 1:
The compression port is segmented into two separate check valves: a first check valve with high cracking pressure and a second check valve with low cracking pressure. This segmentation allows the damper to handle different vibration frequencies through separate pathways, resolving the contradiction between providing sufficient damping force and maintaining fast response time.
Solution Approach 2:
The damper dynamically switches between different compression pathways based on the vibration frequency and compression force. During initial contact, the low cracking pressure second check valve opens first for quick response to high-frequency vibrations. As compression continues and force increases, the high cracking pressure first check valve opens to provide sustained damping force, thus adapting the damping characteristics to the current operating conditions.
2Loss of time
If a bypass flow path with low cracking pressure is added, then the response time is improved and high-frequency vibrations are damped, but the device complexity increases
Solution Approach 1:
The first and second check valves are merged within a single piston structure, sharing common components such as the piston body, sealing elements, and housing. This integration reduces the overall device complexity compared to having separate valve assemblies, while still providing the benefits of dual cracking pressure pathways for improved response time and high-frequency vibration damping.
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 design enables quicker shock absorption and improved tire traction by reducing delay in compression, effectively damping both low and high-frequency vibrations, enhancing overall suspension performance.
Implementation Method 1
a first check valve with a first cracking pressure and a second check valve with a second cracking pressure lower than the first cracking pressure
Implementation Method 2
fluid flow through the bypass compression port from the first chamber to the second chamber
Implementation Method 3
enables quicker shock absorption and improved tire traction by reducing delay in compression
Implementation Method 4
effectively damping both low and high-frequency vibrations
Data Source
AI summary
Bicycle suspension components are described herein. An example damper for a bicycle suspension component includes a damper body defining a chamber and a damper member disposed in the chamber. The damper member includes a piston having a first compression port and a bypass compression port. The damper member includes a first valve to control fluid flow through the first compression port and a second valve to control fluid flow through the bypass compression port. During a first portion of travel of the damper member during a compression stroke, the second valve is to open to enable fluid flow through the bypass compression port from a first chamber to a second chamber, and during a second portion of travel of the damper member during the compression stroke, the first valve is to open to enable fluid flow through the first compression port from the first chamber to the second chamber.