Parallel Damping Circuits in Telescopic Fork Legs
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Solution Overview
Problem
Current front fork damping systems face limitations in handling high speeds and large strokes due to serial damping designs, which can lead to cavitation and uncontrollable pressure build-up, and are not easily adaptable to different fork dimensions.
Innovation Solution
A telescopic fork leg with a damping system featuring concentric tubes and parallel medium flow passages, allowing for adjustable damping characteristics through valves, preventing cavitation and enabling adaptation to various fork dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serial damping is used to prevent cavitation, then cavitation is avoided, but the flow resistance can only be adjusted within a limited range and uncontrollable pressure build-up may occur
Solution Approach 1:
The damping system is divided into multiple independent parallel damping circuits instead of a single serial circuit. Each circuit has its own damping piston and flow resistance adjustment mechanism, allowing independent adjustment of each circuit's damping characteristics while maintaining cavitation prevention in all circuits simultaneously
Solution Approach 2:
The system allows dynamic adjustment of flow resistance in each parallel circuit through shim stacks or adjustable valves, enabling the damping characteristics to be adapted to different operating conditions and terrain types while maintaining the parallel architecture that prevents cavitation
2Force
If high flow resistance is used to increase damping force, then damping force increases, but uncontrollable pressure build-up occurs due to high flow speeds
Solution Approach 1:
The total damping force is distributed across multiple parallel circuits rather than concentrated in a single circuit. This segmentation allows the system to achieve high total damping force while each individual circuit operates at lower flow speeds and pressures, preventing uncontrollable pressure build-up
Solution Approach 2:
The parallel circuit architecture acts as an intermediary mechanism that decouples the relationship between total damping force and pressure build-up. By providing multiple parallel pathways for oil flow, the system can generate high damping forces through the combined effect of multiple circuits while each circuit maintains manageable pressure levels
3Reliability
If the damping system is designed for specific fork dimensions, then optimal damping performance is achieved, but adaptability to different fork dimensions is limited
Solution Approach 1:
The parallel damping system with adjustable flow resistance in each circuit creates a universal damping platform that can be adapted to different fork dimensions and application requirements. The modular parallel circuit architecture allows the same basic system design to serve multiple functions across different motorcycle models and fork sizes
Solution Approach 2:
The system allows adjustment of damping parameters through changing shim stacks or valve settings in each parallel circuit, enabling the same physical hardware to be tuned for different fork dimensions and performance requirements. This parameter adjustability provides versatility across applications without requiring complete system redesign
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 solution provides effective damping across a wide range of speeds and strokes without cavitation, allowing for easy adjustment and compatibility with different front fork dimensions, enhancing the damping system's adaptability and performance.
Implementation Method 1
a pressurizing device that pressurizes the damping medium in the compression chamber and in the return chamber parallel to a movement of the piston
Implementation Method 2
The concentric tubes together form a removable insert system that comprises parallel medium flow passages for the flow between the upper and lower sides of the main piston
Data Source
Figure 1~2
Figure 3
Figure 4~4a
AI summary
A device for telescopic fork legs, preferably for a motorcycle or bicycle. The damping system comprises two damping system components that are both acted upon by the flow of medium created by the compression and expansion movements of the piston. The damping system components together form a compact unit in the form of a removable insert system, that comprises medium flow passages that are parallel in relation to each other and that run between the upper and lower sides of the piston. This insert system forms a compact unit that is simple to adapt to suit different front fork dimensions and to use as a kit for providing an existing front fork with parallel damping. Parallel damping achieves, for example, simple adaptation of the damping characteristics to different types of terrain.