Low-Viscosity Lubricating Oil Composition for Fuel Economy and Wear Protection
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Solution Overview
Problem
Existing lubricating oils face challenges in improving fuel economy while maintaining superior anti-wear performance, as reducing viscosity leads to increased engine wear and detrimental effects such as deposit formation and seal impacts.
Innovation Solution
A lubricating oil composition comprising a major amount of lubricating viscosity oil, dispersant polymethacrylate (DPMA) with specific molecular weight and shear stability index, ethylene-based olefin copolymer viscosity index improver, magnesium detergent, and minimal molybdenum content, formulated to achieve a high temperature high shear viscosity range of 1.3 to 2.9 cP, enhancing friction reduction and wear protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the viscosity of lubricating oil is reduced to improve fuel economy, then fuel economy is improved, but anti-wear performance deteriorates and engine wear increases
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricating oil by incorporating specific additives (friction modifiers, anti-wear agents, dispersants, detergents) in optimized concentrations. This allows the oil to maintain low base viscosity for fuel economy while the additives provide protective films that prevent wear, thus resolving the contradiction between low viscosity and anti-wear performance
Solution Approach 2:
The patent creates a composite lubricating oil system by combining base oil with multiple functional additives that work synergistically. The friction modifiers reduce surface friction, anti-wear agents form protective films, dispersants prevent deposit formation, and detergents clean surfaces. This composite approach enables the oil to simultaneously achieve low viscosity for fuel economy and superior protection against wear
2Use of energy by moving object
If friction modifiers are added to reduce surface friction and improve fuel economy, then fuel economy is improved, but deposit formation increases and seals are impacted
Solution Approach 1:
The patent introduces dispersants and detergents as intermediary substances that counteract the harmful effects of friction modifiers. Dispersants keep potential deposits suspended and prevent them from forming on surfaces, while detergents clean and protect seal materials. These intermediaries enable the friction modifiers to reduce friction for fuel economy without causing deposit formation or seal damage
3Temperature
If viscosity index improvers are used to maintain viscosity at low temperatures, then cold-start performance is improved, but shear stability decreases and viscosity breaks down under high stress
Solution Approach 1:
The patent optimizes the molecular weight distribution and chemical structure parameters of the viscosity index improver polymers. By selecting polymers with appropriate characteristics and controlling their concentration, the oil achieves good cold-flow properties while maintaining adequate shear stability. The additive package further stabilizes the viscosity under stress, resolving the contradiction between cold-start performance and shear stability
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 effectively improves fuel economy and reduces wear in internal combustion engines by maintaining optimal viscosity and film formation, while minimizing deposit formation and seal impacts.
Implementation Method 1
these additives often bring with them detrimental effects such as increased deposit formation, seals impacts, or they out-compete the anti-wear components for limited surface sites, thereby not allowing the formation of an anti-wear film
Implementation Method 2
adding organic or organometallic friction modifiers reduces the surface friction of the lubricating oil and allows for better fuel economy
Implementation Method 3
US 6303548 discloses an SAE 0W-40 lubricant comprises the base oil and a mixture of polymethacylate and olefin copolymer or hydrogenated diene VI improvers
Implementation Method 4
Under high temperatures and high stress conditions viscosity index improver degradation can occur. As this happens, the viscosity of the oil decreases which may lead to increased engine wear
Data Source
AI summary
Provided is a lubricating oil comprising: (a) a major amount of an oil of lubricating viscosity, (b) a dispersant polymethacrylate (DPMA) VII, (c) a non-dispersant ethylene-based olefin copolymer viscosity index improver, (d) a magnesium containing detergent; wherein the lubricating oil composition is substantially free of molybdenum containing element. Also provided is a method for improving friction and reducing wear in an internal combustion engine using said engine lubricating oil composition.