Lubricant Composition for Gearboxes with Modified Poly-Alpha-Olefin
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Solution Overview
Problem
Commercial lubricant oils for gearboxes, particularly those with rolling elements, face challenges such as poor elastomer compatibility, wear of metal gear components, leaks, and sludge formation, which hinder their ability to meet the requirement of uninterrupted operation for 20,000 hours, especially in critical applications like robotics and automotive manufacturing.
Innovation Solution
A lubricant composition comprising a base oil with a modified poly-alpha-olefin and an additive composition including molybdenum dialkyldithiocarbamate and an oil-soluble mono-, di-, or tri-glyceride of hydroxyl polycarboxylic acid or its ether/ester derivative, which provides improved longevity, anti-wear properties, and reduced sludge formation, while being compatible with seal elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If synthetic oil formulations (poly-alpha-olefin base oil) are used to extend operational longevity, then the duration of action is improved, but the solubility of additive components deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the base oil by introducing polar functional groups (ester, ether, amide, or nitrile groups) to the poly-alpha-olefin backbone. This parameter change increases the polarity and chemical reactivity of the base oil, thereby improving its ability to solubilize polar additive components while maintaining the synthetic oil's inherent longevity benefits
Solution Approach 2:
The patent creates a composite base oil structure by combining poly-alpha-olefin chains with polar functional groups. This composite material approach integrates the long-chain stability of PAO with the polar interaction capabilities of functional groups, achieving both extended operational life and improved additive solubility
2Ease of manufacture
If conventional lubricant formulations are used, then ease of manufacture is improved, but reliability deteriorates due to seal degradation and wear
Solution Approach 1:
The patent applies local quality by introducing specific polar functional groups at strategic positions along the poly-alpha-olefin chain. These localized functional groups provide targeted interactions with seal elastomers and metal surfaces, improving reliability in critical areas while maintaining the overall simplicity of the base oil formulation
Solution Approach 2:
The polar functional groups act as intermediaries between the non-polar poly-alpha-olefin base and the polar additive components. These intermediary groups facilitate better compatibility and distribution of additives throughout the lubricant, thereby improving overall system reliability without complicating the base formulation
Data Source
AI summary
A lubricant composition is prepared having a base oil composition and an additive composition comprising a molybdenum dialkyldithiocarbamate and an organic friction modifier such as an oil-soluble mono-, di- or tri-glyceride of at least one hydroxyl polycarboxylic acid, or a derivative thereof may, especially when used in combination with a base oil composition of a functionally modified poly-alpha-olefin (e.g. alpha-olefin and ester copolymer), a poly-alpha-olefin and optionally an additive carrier such as an alkylated naphthalene. The lubricant composition of the present invention finds particular application as a lubricant composition for robotics and robotic gearboxes, industrial gears and wind turbine gears and especially for gearboxes having a rolling element (such as a spherical bearing or a cylindrical bearing). It provides enhanced longevity, good elastomer compatibility and good anti-wear properties. Embodiments of the invention also demonstrate excellent protection against leaks and sludge.