Cylinder Stopper Mechanism Using a Nested Second Piston
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Solution Overview
Problem
Existing cylinder devices face challenges in enhancing durability, particularly when the piston rod reaches a predetermined range during extension or compression strokes, leading to increased damping forces and potential durability issues.
Innovation Solution
The cylinder device incorporates a stopper mechanism with a second cylinder of smaller diameter and a second piston that moves in conjunction with the piston rod. The second piston is biased by a nut to contact a rod flange part, effectively resisting high pressures and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stopper mechanism is added to manage high pressures during extension or compression strokes, then durability is enhanced, but device complexity increases
Solution Approach 1:
The second piston is nested within the first cylinder, and the stopper mechanism is integrated into the existing cylinder structure. The second piston moves within the first cylinder's bore, utilizing the existing spatial envelope rather than adding external components, thus enhancing durability through pressure management while minimizing increases in device complexity
Solution Approach 2:
The cylinder is divided into two functional zones: the first cylinder for normal operation and the second cylinder (stopper mechanism) for high-pressure events. The piston rod is segmented with different diameter portions (first and second outer diameter parts) to interact with different zones, allowing the stopper mechanism to handle extreme pressures independently without affecting the main cylinder's simplicity during normal operation
2Strength
If the second piston contacts the rod flange part to resist high pressure, then strength and pressure resistance improve, but the structure becomes more complex
Solution Approach 1:
The piston rod features localized structural variations with different outer diameter parts - a first outer diameter part and a second outer diameter part with smaller diameter. The rod flange part is positioned between these diameter transitions and serves as a localized contact point for the second piston during high-pressure events, concentrating the pressure resistance function at a specific location rather than requiring structural changes throughout the entire piston rod
Solution Approach 2:
The second piston is biased by a biasing part to contact the rod flange part dynamically during high-pressure compression or extension strokes. This contact is not continuous but occurs only when needed, allowing the structure to remain simple during normal operation while providing enhanced pressure resistance when required. The dynamic engagement eliminates the need for permanently complex stress-distribution structures
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 configuration enhances the durability of the cylinder device by effectively managing high pressures and maintaining performance during extension and compression strokes.
Implementation Method 1
the other end of the second piston on a side opposite to the first end portion is biased by a biasing part which biases the second piston toward the rod flange part
Data Source
AI summary
The cylinder device includes a first piston fitted in a first cylinder to be slidable, a piston rod connected to the first piston, and a stopper mechanism which operates when the first piston reaches a predetermined position on a first end portion side of one axial end of the first cylinder during an extension stroke or a compression stroke, in which the stopper mechanism includes a second cylinder provided on the first end portion side of the first cylinder and a second piston provided to be movable according to movement of the piston rod and able to fit into the second cylinder, and one end of the second piston on the first end portion side comes into contact with a rod flange part between a rod first outer diameter part of the piston rod and a rod second outer diameter part.