The Effect of Friction Modifiers and DI Package on Friction Reduction Potential of Next Generation Engine Oils: Part I Fresh Oils

2018 ◽  
Author(s):  
Zhiqiang Liu ◽  
Arup Gangopadhyay ◽  
William Lam ◽  
Mark Devlin
Keyword(s):  
Reduction Potential ◽  
Friction Reduction ◽  
Next Generation ◽  
Friction Modifiers ◽  
Engine Oils

scholarly journals MoDTC Tribochemistry in Steel/Steel and Steel/Diamond-Like-Carbon Systems Lubricated With Model Lubricants and Fully Formulated Engine Oils

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Cayetano Espejo ◽  
Benoît Thiébaut ◽  
Frédéric Jarnias ◽  
Chun Wang ◽  
Anne Neville ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Friction Reduction ◽  
Diamond Like Carbon ◽  
Additive Package ◽  
Friction Behavior ◽  
Engine Oils ◽  
Steel Surfaces ◽  
Friction Performance ◽  
Underlying Mechanisms ◽  
First Time

This work focuses on the tribochemistry of molybdenum dithiocarbamate (MoDTC) oil additive to improve friction behavior of diamond-like-carbon (DLC) coated systems lubricated in boundary regime. Raman microscopy has been used to investigate surface tribolayers formed on coated (hydrogenated a-C:H and non-hydrogenated ta-C) and steel surfaces when lubricated with model lubricants and commercial engine oils. The effect of the additive package and the type of DLC played a crucial role in the development and composition of the tribolayer and the friction performance. The additive package contained in the fully formulated (FF) oils limited the friction reduction capabilities of MoDTC additive for every material pair. Accelerated a-C:H coating wear related to MoDTC tribochemistry was found. For the first time, it has been shown that a distinctive MoS2-containing tribolayer can be formed on the ta-C surface, leading to a coefficient of friction lower than 0.04. The underlying mechanisms of MoDTC/surface interactions and their effect on friction and wear are discussed.

Gear oil influences on efficiency of gear and fuel economy of cars

2000 ◽  
Vol 214 (2) ◽  
pp. 189-196 ◽  
Author(s):  
W. J. Bartz
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
High Efficiency ◽  
Friction Reduction ◽  
Friction Modifiers ◽  
Oil Viscosity ◽  
Fuel Economy Improvement ◽  
Viscosity Grade ◽  
Gear Oil ◽  
Gear Oils

1. First of all, it should be considered that the fuel consumption of a car depends on a set of parameters only partly related to tribology. Their influence is much more pronounced than that of the lubricant. 2. Only the mechanical losses can be decreased by lubricant-related measures. Therefore, the fuel economy improvement that possibly might be realized is rather limited, especially when taking into account the rather high efficiency of gears. 3. When evaluating the influence of viscosity on fuel consumption, the so-called effective viscosity must be taken into account. This is most important for non-Newtonian oils. 4. Reducing the gear oil viscosity by one SAE viscosity grade will result in fuel consumption reductions of 0.2-1.5 per cent at high temperatures and 0.4-2.5 per cent at low temperatures. 5. Using friction modifiers in gear oils, fuel consumption reductions of between 1.0 and 6.0 per cent are realistic. 6. On the basis of a 50 per cent friction reduction maximum fuel consumption reductions between 1.0 and 5.1 per cent by other gear oils are possible, considering different driving programmes. 7. Tests with a real automobile gear resulted in fuel economy improvements of the order of magnitudes of 1 per cent by other gear oils. 8. The results of measurements confirm in principle the calculated estimations.

scholarly journals Tribological performance of organic molybdenum in the presence of organic friction modifier

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0252203
Author(s):  
Weiwei Wang ◽  
Zhuangzhuang Liu ◽  
Qimin Song ◽  
Xindi Zhang ◽  
Shengkai Jiao ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Low Temperature ◽  
Synergistic Effect ◽  
Tribological Performance ◽  
Friction Reduction ◽  
Ring Test ◽  
Friction Modifiers ◽  
Friction Modifier ◽  
Glycerol Monooleate

The tribological performance of organic molybdenum in the present of organic friction modifier was investigated in this study. Three types of organic friction modifiers were selected, which are Glycerol monooleate, Pentaerythritol and N,N-Dimethylhexadecylamine. The organic molybdenum are MoDTC, MoDDP and molybdenum amide. Friction coefficient and wear were studied in block-on-ring test rig with steel test specimens. Experimental results indicate the Pentaerythritol shows synergistic effect with MoDTC in wide range temperature, while increased the friction coefficient of molybdenum amide in high temperature. N,N-Dimethylhexadecylamine shows synergistic effect with molybdenum amide, while hindered the friction reduction performance of MoDTC in low temperature. The presence of Glycerol monooleate reduced friction coefficient of MoDTC in low temperature, while increased the friction coefficient of molybdenum amide in most situations. All the tested organic friction modifiers improved the friction reduction performance of MoDDP. Most of the tested organic friction modifiers reduced the wear of organic molybdenum. The PT shows the best anti-wear performance with MoDTC. The tribo-chemical products in test specimens lubricated with different lubricant formulas indicate that the presences of Pentaerythritol promotes the production of MoS2 in MoDTC. N,N-Dimethylhexadecylamine promotes the production of MoS2 in molybdenum amide. The side products of MoO1.6S1.6 and Cr/MoS2 of MoDDP in high temperature lead to high friction coefficient.

The Influence of Friction Modifiers in Fully Formulated Motorcycle Engine Oils

2018 ◽  
Author(s):  
David Gillespie ◽  
Gareth Moody ◽  
Aitziber Viadas
Keyword(s):  
Friction Modifiers ◽  
Engine Oils ◽  
Motorcycle Engine
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