Bicycle Saddle Post Suspension with Inertia Valve
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Solution Overview
Problem
Traditional bicycle saddle suspensions often compromise saddle height stability during pedaling, as they respond to both terrain-induced and rider-induced forces, affecting pedaling efficiency and comfort.
Innovation Solution
A saddle post suspension system with an inertia valve mechanism that differentiates between terrain-induced and rider-induced forces, using a damping apparatus with an inertia mass and biasing spring to control motion, allowing downward movement in response to terrain forces while maintaining stability during pedaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional saddle suspension system is used, then the saddle can move to absorb terrain impacts, but the saddle height becomes unstable during pedaling due to rider-induced forces
Solution Approach 1:
The damping apparatus dynamically adjusts its damping characteristics based on the type of force applied. The inertia mass mechanism automatically modifies damping force in response to acceleration patterns, providing low damping for terrain-induced downward motion and high damping for rider-induced forces during pedaling, thus resolving the contradiction between impact absorption and height stability
Solution Approach 2:
The system changes the damping parameter (damping force) based on the acceleration pattern detected by the inertia mass. When vertical acceleration exceeds a threshold (indicating terrain impact), the damping force decreases to allow saddle movement. When acceleration is below the threshold (indicating pedaling forces), the damping force increases to maintain saddle height stability
2Object-affected harmful factors
If the saddle is allowed to move freely to absorb bumps, then comfort is improved, but the distance from the saddle to the pedal crank varies, affecting pedaling efficiency
Solution Approach 1:
The damping apparatus dynamically adjusts damping force based on acceleration patterns. During pedaling (low acceleration), high damping maintains constant saddle-to-crank distance for optimal pedaling efficiency. During terrain impacts (high acceleration), low damping allows saddle movement to absorb bumps, thus resolving the contradiction between comfort and pedaling efficiency
3Object-affected harmful factors
If a spring mechanism is added to enable saddle movement, then impact absorption is improved, but the system complexity increases
Solution Approach 1:
The patent combines the spring mechanism with a damping apparatus into an integrated saddle suspension system. The spring provides the necessary compliance for impact absorption, while the damping apparatus (including inertia mass and adjustable damping mechanism) controls the motion characteristics. This merging of functions resolves the contradiction by providing a unified system that handles both impact absorption and motion control
Solution Approach 2:
The inertia mass mechanism automatically detects acceleration patterns and self-adjusts the damping force without external input. The system uses the physical principle of inertia to sense terrain impacts and automatically modifies damping characteristics, reducing the need for complex electronic sensors and control systems while maintaining effective impact absorption
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 maintains optimal saddle height and pedaling efficiency by minimizing downward motion in response to rider-induced forces, enhancing comfort and reducing the risk of injury from impact forces.
Implementation Method 1
an inertia mass configured to have open and closed positions, wherein in the open position, the inertia mass permits a flow of damping fluid through an orifice, and, in the closed position, the inertia mass reduces said flow of said damping fluid through the orifice; and a biasing spring that biases the inertia mass to the closed position, wherein the inertia mass and biasing spring are configured to enable the inertia mass to move toward the open position in response to an externally-applied force above a predetermined threshold
Implementation Method 2
a damping apparatus configured to damp motion of the saddle support mechanism with respect to the body, the damping apparatus comprising: an inertia mass configured to have open and closed positions, wherein in the open position, the inertia mass permits a flow of damping fluid through an orifice
Implementation Method 3
a suspension spring that biases the saddle support mechanism in the first direction with respect to the body
Data Source
AI summary
A bicycle saddle suspension assembly comprises a body configured to couple to a bicycle frame; a saddle support mechanism configured to couple to a bicycle saddle; a suspension spring that biases the saddle support mechanism in a first direction with respect to the body; and a damping apparatus configured to damp motion of the saddle support mechanism with respect to the body, the damping apparatus configured to reduce a level of damping responsive to a terrain-induced force.