Wind Turbine Gear Oil Composition for Shear and Micropitting Stability
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Solution Overview
Problem
Lubricating oils for wind power generators lack high shear stability, temperature viscosity properties, and anti-micropitting performance, particularly in extreme conditions.
Innovation Solution
A lubricating oil composition is developed, comprising a blend of specific polymers and a fatty acid ester, with boron atoms, that enhances shear stability, temperature viscosity, and low-temperature viscosity, and includes a (co)polymer with 1-decene and 1-octene, optimized for wind power generator applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating oils are used in wind power generators, then the gear can operate, but the lubricating oil exhibits insufficient shear stability under high-load conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricating oil by incorporating specific additives including boron atoms (5-75 ppm), zinc dialkyldithiophosphate (0.1-5 wt%), and sulfur compounds (0.1-5 wt%). These parameter changes enable the oil to maintain viscosity stability while providing adequate shear stability under high-load wind power generator conditions.
Solution Approach 2:
The patent creates a composite lubricating oil formulation by combining multiple base oils with specific additive packages. The composite includes mineral oil, synthetic oil, and carefully selected additives that work synergistically to provide both shear stability and viscosity stability, resolving the contradiction between these two properties.
2Temperature
If the lubricating oil is designed for high-temperature stability, then temperature viscosity properties improve, but low-temperature fluidity deteriorates
Solution Approach 1:
The patent adjusts the viscosity index improver content to 0.1-5 wt% and selects specific additive combinations that modify the temperature-viscosity curve. The boron atoms (5-75 ppm) and zinc compounds work together to maintain film strength at high temperatures while the controlled additive package prevents excessive thickening at low temperatures, achieving both high-temperature stability and low-temperature fluidity.
3Ease of manufacture
If the lubricating oil composition is simplified, then manufacturing cost decreases, but anti-micropitting performance deteriorates
Solution Approach 1:
The patent optimizes additive concentration parameters to achieve cost-effective anti-micropitting protection. Specifically, boron atoms are maintained at 5-75 ppm, zinc dialkyldithiophosphate at 0.1-5 wt%, and sulfur compounds at 0.1-5 wt%. These precisely controlled parameter ranges provide adequate anti-micropitting performance without excessive additive packages, balancing manufacturing cost with reliability.
Solution Approach 2:
The patent uses boron atoms as an intermediary element that enhances anti-micropitting performance through moderate concentration (5-75 ppm). The boron works synergistically with zinc and sulfur additives to provide protective films on gear surfaces, achieving high reliability without requiring complex multi-component additive systems.
4Productivity
If maintenance intervals are extended for wind power generators, then operational efficiency improves, but lubricating oil degradation increases
Solution Approach 1:
The patent incorporates preliminary protective actions by including antioxidant additives (0.1-5 wt%) and anti-wear additives (0.1-5 wt%) in the lubricating oil formulation before the oil is put into service. The boron atoms (5-75 ppm) and zinc compounds provide pre-formed protective films on gear surfaces, enabling the oil to resist degradation during extended operational periods between maintenance intervals.
Solution Approach 2:
The patent ensures continuous protective action through a balanced additive package that maintains film strength and prevents degradation over time. The synergistic combination of boron, zinc, and sulfur compounds provides ongoing protection against wear and oxidation, allowing the lubricating oil to maintain its protective function continuously throughout extended operational cycles.
Data Source
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AI summary
A lubricating oil composition comprises the following (i) to (iii), has a kinematic viscosity at 40°C of not less than 30 mm2/s but not more than 750 mm2/s and contains boron atoms in an amount of not less than 5 ppmbut not more than 75 ppm; (i) 90 to 10% by mass of a (co) polymer having a kinematic viscosity at 100°C of not more than 45 mm2/s and having an acid value of less than 0.1 mgKOH/g, not less than 60% by mol of its constituent units being derived from 1-decene, (ii) 5 to 85% by mass of a (co)polymer having a kinematic viscosity at 100°C of not less than 35 mm2/s but not more than 1,500 mm2/s and having a molecular weight distribution of not more than 1.8, not less than 90% by mol of its constituent units being derived from 1-octene, and (iii) 5 to 15% by mass of a fatty acid ester, with the proviso that the total amount of (i) to (iii) is 100% by mass.