Sealing Piston Ring Damping for Wear-Stable Working Cylinders
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Solution Overview
Problem
Existing damping solutions for hydraulic working cylinders face challenges in precision, adjustability, robustness, and durability due to wear-related changes in damping behavior and complex manufacturing requirements.
Innovation Solution
A working cylinder with end-position damping featuring a piston ring with a unique design that includes a ring body with interruptions, allowing for radial expansion and automatic readjustment, and an axial overflow channel for precise control of damping, ensuring consistent sealing and damping characteristics despite wear and manufacturing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping ring with a ring gap is used to throttle hydraulic fluid outflow, then end-position damping is achieved, but the damping behavior changes due to wear of the piston ring
Solution Approach 1:
The invention extracts the damping function from the piston ring's ring gap and relocates it to a dedicated damping bore in the piston. This separates the sealing function (performed by the piston ring) from the damping function (performed by the damping element in the damping bore), so that wear of the piston ring no longer affects damping behavior.
Solution Approach 2:
The piston is segmented into functional zones: a sealing zone with the piston ring and a damping zone with the damping bore and damping element. This segmentation allows independent optimization and maintenance of sealing and damping functions, preventing wear of one component from affecting the other.
2Ease of operation
If a conical damping zone is used for progressive damping, then the damping ring is compressed and the ring gap is progressively reduced, but the manufacture is technologically very demanding due to required precision
Solution Approach 1:
The damping element is designed to be adjustable by the user through simple means (such as rotating the damping element to change its position in the damping bore), allowing progressive damping characteristics to be configured without requiring precision conical machining of the damping zone itself. The system serves itself by allowing user adjustment of damping characteristics.
3Ease of manufacture
If material removal occurs on the outer circumference of the piston ring due to wear, then the ring gap progressively widens, but the damping behavior changes
Solution Approach 1:
The damping function is extracted from the piston ring and placed in a separate damping bore, so that the piston ring's only function is sealing. This eliminates the coupling between ring gap wear and damping behavior, allowing the piston ring to wear without affecting damping consistency.
4Measurement precision
If a damping solution is designed for high precision and adjustability, then damping performance is improved, but the device complexity increases
Solution Approach 1:
The damping bore and damping element are designed to be universal components that can be integrated into different piston designs and cylinder types. The damping element can be adjusted to provide different damping characteristics, making it a multi-functional solution that achieves high precision damping without proportionally increasing overall device complexity.
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 highly precise, adjustable, and robust damping with consistent performance over time, unaffected by wear, and can be produced cost-effectively, suitable for various cylinder types, including differential and synchronized cylinders.
Implementation Method 1
The pressure medium acts with the pressure p on the second axial ring surface (3.21) of the piston ring (3.0) and causes the piston ring (3.0) to expand radially
Implementation Method 2
the piston ring (3.0) is provided in a resilient, in particular radially elastic design
Implementation Method 3
the piston ring (3.0) compensates for wear by automatic readjustment
Data Source
AI summary
A working cylinder which has end-position damping. A piston ring passes over an axially offset pressure medium connection and encloses a pressure medium damping volume. The piston ring includes a ring joint which has a base section and a projection section. The piston ring is of sealing construction. The pressure medium flows out of the pressure medium damping volume via an axial transfer channel, which can be defined by an axial cylinder-tube groove or an axial piston-ring groove. Also, there is a damping piston ring, which is of sealing construction and which has an axial piston-ring groove.