Cylinder-Piston Throttle for Hydraulic Damping
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Solution Overview
Problem
The existing cylinder-piston unit has limited damping and braking performance when the piston rod is retracted.
Innovation Solution
The cross-sectional area of the passageway, multiplied by the reciprocal of its length and the reciprocal of the mean roughness value R a of its boundary surfaces, is optimized to be less than 50, enhancing the damping and braking performance by throttling the flow of hydraulic fluid through a specifically designed piston and valve disk configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the passageway cross-sectional area is reduced to increase damping performance, then the damping capacity improves, but the flow resistance increases excessively
Solution Approach 1:
The patent applies parameter changes by optimizing the passageway geometry (cross-sectional area, length, and roughness) to achieve the desired damping capacity while controlling flow resistance. The specific parameter combination (cross-sectional area × 1/length × 1/roughness < 50) represents a quantified parameter optimization that balances damping performance with acceptable flow characteristics.
2Power
If the passageway length is increased to enhance damping effect, then the damping performance improves, but the pressure loss increases
Solution Approach 1:
The patent uses parameter changes by establishing an optimized relationship between passageway length and other geometric parameters. The formula cross-sectional area × 1/length × 1/roughness < 50 provides a quantitative guideline for selecting passageway dimensions that achieve sufficient damping effect while limiting pressure loss to acceptable levels.
3Power
If the surface roughness is increased to improve damping capacity, then the energy dissipation improves, but the flow restriction becomes excessive
Solution Approach 1:
The patent applies parameter changes by optimizing the surface roughness parameter within the context of the overall passageway geometry. The criterion cross-sectional area × 1/length × 1/roughness < 50 establishes a balanced relationship where increased roughness for damping is compensated by appropriate adjustments in cross-sectional area and length to maintain acceptable flow rates.
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 achieves high damping and deceleration performance by severely throttling the oil flow, delaying the retracting speed of the piston rod and providing effective braking, while allowing smooth extension with minimal resistance.
Implementation Method 1
The cross-sectional area of the passageway, multiplied by the reciprocal of its length and the reciprocal of the mean roughness value Ra of its boundary surfaces, is less than 50
Implementation Method 2
severely throttling the oil flow, delaying the retracting speed of the piston rod and providing effective braking
Data Source
AI summary
The invention relates to a cylinder-piston unit comprising a cylinder and a piston which is guided in said cylinder by means of a piston rod and which is sealed off against the cylinder internal wall and which delimits a displacement chamber with respect to a compensation chamber and which has at least one longitudinal aperture, wherein a compensation piston which is sealed off at least against the cylinder internal wall is arranged in the compensation chamber or in the displacement chamber, and wherein a valve disk together with the displacement-chamber-side piston surface delimits a passage path. The cross-sectional area of the passage path multiplied by the reciprocal of the length of the passage path and the reciprocal of the average roughness Ra of its boundary surfaces is less than 50. The present invention provides a cylinder-piston unit with high damping and braking performance.