Two-Wheeler Engine Oil Composition With P/Mo Ratio Control
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Solution Overview
Problem
Existing lubricating oil compositions for two-wheeled vehicles do not optimally balance the content ratio of zinc dialkyldithiophosphate and organic molybdenum compounds for enhanced fuel efficiency.
Innovation Solution
A lubricating oil composition for two-wheeled vehicles with a specific mass ratio (P/Mo) of phosphorus to molybdenum content between 0.8 and 2.0, and a kinematic viscosity of 5.0 to 7.1 mm²/s, using a zinc dialkyldithiophosphate and a molybdenum-based friction modifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the content of zinc dialkyldithiophosphate and organic molybdenum compound is increased to reduce friction and improve fuel efficiency, then fuel efficiency is improved, but the balance between these additives becomes difficult to control and may cause other performance degradation
Solution Approach 1:
The patent applies parameter changes by establishing a specific mass ratio range (P/Mo: 0.8 to 2.0) between phosphorus from zinc dialkyldithiophosphate and molybdenum from the friction modifier. This quantitative parameter control optimizes the synergistic effect between the two additives, achieving reduced friction and improved fuel efficiency while maintaining compositional stability and preventing performance degradation.
2Use of energy by moving object
If the viscosity of the lubricating oil is reduced to improve fuel efficiency, then fuel efficiency is improved, but the lubricating film strength may be insufficient leading to increased wear
Solution Approach 1:
The patent employs a composite lubricating oil formulation combining zinc dialkyldithiophosphate (providing phosphorus) and a molybdenum-based friction modifier. This composite approach creates a synergistic effect where the specific P/Mo ratio (0.8 to 2.0) enables the formation of a strong, low-friction tribological film that maintains adequate lubricating film strength even at reduced viscosities (5.0 to 7.1 mm²/s at 100°C), thereby improving fuel efficiency without sacrificing wear protection.
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 achieves improved fuel efficiency and reduced catalyst poisoning, while maintaining effective lubrication properties.
Implementation Method 1
a lubricating oil composition for a two-wheeled vehicle, containing a base oil, (A) a zinc dialkyldithiophosphate, and (B) a molybdenum-based friction modifier
Implementation Method 2
maintaining an effective oil film, thereby extending engine life and performance
Data Source
AI summary
Provided is a lubricating oil composition for a two-wheeled vehicle, containing a base oil, (A) a zinc dialkyldithiophosphate, and (B) a molybdenum-based friction modifier, in which a mass ratio (P/Mo) of a content of a phosphorus atom derived from the zinc dialkyldithiophosphate (A) to a content of a molybdenum atom derived from the molybdenum-based friction modifier (B) is 0.8 or more and less than 2.0, and a kinematic viscosity at 100° C. is 5.0 to 7.1 mm2/s, the lubricating oil composition for a two-wheeled vehicle by which excellent fuel efficiency is achieved.