Stroke-Dependent Throttle Check Valve for Piston End Cushioning
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Solution Overview
Problem
Existing spring-damper systems face challenges in maintaining operational reliability, particularly in preventing piston end-position impacts during stroke, which can lead to damage and reduced performance under sudden external loads.
Innovation Solution
A hydraulic connecting line outside the displacement spaces connects the two spaces, and a piston-stroke-dependent throttle check valve is introduced, forming a throttle check valve with the cylinder near the end positions to delay piston movement, preventing end-position impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston moves directly to the end position without throttling, then the stroke speed is high and response is fast, but the piston impacts the end position causing damage and reduced reliability
Solution Approach 1:
The throttle check valve is activated in advance before the piston reaches the end position to gradually reduce the piston's movement speed. This preliminary throttling action prevents the piston from impacting the end position, thereby protecting the system while maintaining overall operational reliability
Solution Approach 2:
The system dynamically adjusts the throttle valve opening based on the piston's position and speed. The throttle check valve transitions from closed to progressively more open states as the piston approaches the end position, creating a dynamic speed control mechanism that balances fast response with impact prevention
2Adaptability or versatility
If a throttle valve is always open during piston stroke, then the piston movement is continuously controlled, but the damping characteristics become fixed and less adaptable to varying load conditions
Solution Approach 1:
The throttle check valve is designed to automatically adjust its opening based on the piston's movement characteristics and system pressure conditions. This self-regulating mechanism provides adaptive damping without requiring external control systems, maintaining simplicity while achieving versatility
Solution Approach 2:
The system changes the throttle valve's flow parameters dynamically during operation. As the piston moves through different positions and under varying loads, the effective throttle opening changes, allowing the damping characteristics to adapt to different operating conditions without fixed settings
3Productivity
If the hydraulic fluid is displaced quickly between displacement chambers, then the piston stroke is fast and productivity is high, but the piston may hit the end position causing harmful impacts
Solution Approach 1:
The throttle check valve initiates speed reduction in advance before the piston reaches the end position. This preliminary action allows the piston to maintain high speed during most of the stroke for productivity, while gradually reducing speed near the end to prevent harmful impacts
Solution Approach 2:
The throttle check valve creates a cushioning effect by restricting hydraulic fluid flow before the piston reaches the end position. This beforehand cushioning reduces the piston's kinetic energy progressively, preventing hard impacts while maintaining overall stroke efficiency
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 operational reliability by preventing piston impacts and reducing the risk of damage during sudden loads, while allowing for adjustable damping characteristics through the throttle valve mechanism.
Implementation Method 1
the piston and the cylinder form a throttle check valve. This throttle check valve slows the piston's movement during this partial stroke
Data Source
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AI summary
The invention relates to a spring-damper system with a spring energy storage device and a hydraulic cylinder-piston unit connected in parallel to it. This unit comprises a cylinder and a piston that is displaceable within the cylinder and separates a first displacement space from a second displacement space. The invention also relates to a two-wheeled vehicle equipped with such a spring-damper system. A hydraulic connecting line, arranged outside the displacement spaces, connects the first and second displacement spaces. At least in a partial stroke of the piston adjacent to one of the end positions of the piston stroke, this line includes a piston-stroke-dependent throttle check valve. The present invention increases the operational reliability of a spring-damper system.