Lubricating Oil Composition for Shock Absorbers
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Solution Overview
Problem
Existing lubricating oil compositions for shock absorbers fail to provide excellent lubricity and heat stability for both copper and iron guide bushes, and using different oils for different materials is inconvenient.
Innovation Solution
A lubricating oil composition combining dialkyl hydrogen phosphite, a sulfur antioxidant, and polyalkenyl succinimide with a base oil, which improves lubricity and heat stability while being suitable for both copper and iron guide bushes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extreme pressure agent and an oiliness agent are added to the base oil to improve lubricity to metals, then lubricity is improved, but heat stability is deteriorated
Solution Approach 1:
The patent changes the chemical composition parameters by using a specific phosphorous extreme pressure agent (dilauryl hydrogen phosphite) in combination with a sulfur antioxidant and polyalkenyl succinimide at controlled concentrations (0.01-5 mass% each), achieving both improved lubricity and maintained heat stability through optimized additive package formulation
Solution Approach 2:
The patent creates a composite lubricating oil composition by combining multiple additives (phosphorous extreme pressure agent, sulfur antioxidant, polyalkenyl succinimide) with the base oil, where the synergistic interaction of these components achieves both excellent lubricity and heat stability that cannot be obtained by single additives alone
2Reliability
If different shock absorber oils are used for copper and iron guide bushes, then lubricity for each material is optimized, but device complexity and ease of operation are worsened
Solution Approach 1:
The patent develops a universal lubricating oil composition that effectively lubricates both copper and iron guide bushes simultaneously, eliminating the need for separate oils for different materials. The composite additive package provides broad-spectrum compatibility across multiple metal types, simplifying maintenance and operation
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 composition exhibits excellent lubricity and heat stability, making it suitable for shock absorbers in automobiles and other applications, and can be used with both copper and iron guide bushes without compromising performance.
Implementation Method 1
a predetermined phosphorous extreme pressure agent (e.g., dilauryl hydrogen phosphite) improves lubricity to iron metal and copper metal
Implementation Method 2
concurrent use of a sulfur antioxidant and a polyalkenyl succinimide with the above phosphorous extreme pressure agent can improve the heat stability (sludge resistance)
Implementation Method 3
concurrent use of a sulfur antioxidant and a polyalkenyl succinimide with the above phosphorous extreme pressure agent can improve the heat stability (sludge resistance)
Data Source
AI summary
A lubricating oil composition includes: a base oil; a component (A) that is a dialkyl hydrogen phosphite; a component (B) that is a sulfur antioxidant; and a component (C) that is a polyalkenyl succinimide. Since the lubricating oil composition of the invention exhibits an excellent lubricity to both iron metal and copper metal and an excellent heat stability, the lubricating oil composition of the invention is suitable for a shock absorber of an automobiles and the like.