Microtextured Hydraulic Rod Surface for Low-Friction Seal Life
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Solution Overview
Problem
Hydraulic components, such as hydraulic cylinders, face challenges with friction and energy consumption due to moving parts and seals, which affect their operational lifetime and efficiency.
Innovation Solution
A hydraulic rod with a microtextured surface finish featuring valleys and microporosities of equal or greater depth is introduced, along with a lubrication method that forms microtexturation on the surface of moving parts to reduce friction and enhance lubrication capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a smooth surface finish is used on the hydraulic rod, then friction is reduced initially, but the surface wears out quickly and lubrication becomes inadequate over time
Solution Approach 1:
The patent applies porous materials by creating microporosities (micro-cavities) on the hydraulic rod surface through laser texturation. These porosities have a mean depth of 2-10 micrometers and serve as reservoirs to store lubricant, ensuring continuous lubrication supply during reciprocating motion. This resolves the contradiction by maintaining low friction over extended operational periods through the progressive release of stored lubricant from the porous structure.
Solution Approach 2:
The patent implements preliminary action by pre-storing lubricant within the microporosities during the manufacturing process. The laser texturation creates a predetermined porous structure that is filled with lubricant before the component enters service. This preliminary lubricant storage ensures that lubrication is available from the start and continues throughout the component's operational lifetime, preventing the wear that would otherwise occur with smooth surfaces.
2Duration of action of moving object
If microporosities are added to the surface, then lubrication capacity is enhanced and lifetime is extended, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical surface finishing methods with laser texturation technology. The laser creates the microporous structure through thermal processing rather than mechanical machining, eliminating the need for complex multi-step mechanical processes. This substitution reduces manufacturing complexity while achieving the desired microporous structure that enhances lubrication capacity and extends seal lifetime.
Solution Approach 2:
The patent applies parameter changes by controlling laser processing parameters (power, speed, pulse duration) to create microporosities with specific characteristics (mean depth of 2-10 micrometers, controlled distribution). By optimizing these parameters, the process achieves the required surface structure in a single step, balancing the enhanced lubrication capacity against manufacturing complexity through precise parameter control.
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 microtextured surface significantly decreases the friction coefficient by up to 24%, extending the lifetime of fluid seals and hydraulic cylinder components by maintaining adequate lubrication even as the original surface valleys wear out.
Implementation Method 1
the rod further comprises microporosities on a surface thereof, the microporosities having a depth at least equal to a depth of the valleys
Data Source
AI summary
A hydraulic rod in reciprocating movement within a barrel of a hydraulic cylinder along a longitudinal direction of the barrel, and a method of manufacturing thereof, a surface finish of the rod comprising valleys, wherein the rod further comprises microporosities on its surface, the microporosities having a depth at least equal to a depth of the valleys.