Traction coefficient reducing lubricating oil composition

a technology of lubricating oil and traction coefficient, which is applied in the direction of hydrocarbon oil treatment, lubricant composition, base materials, etc., can solve the problems of increasing wear at lower contact speeds, and achieve the effect of reducing the traction coefficient in internal combustion engines

Inactive Publication Date: 2008-06-05
CHEVRON ORONITE CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0001]The present invention is directed to a traction coefficient reducing lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity comprising a blend of two or more isomerized Fischer-Tropsch derived base oils wherein the kinematic viscosity of the blend is in a range from about 2 to about 14 centistokes at 100° C., and (b) one or more lubricating oil additives wherein the lubricating oil composition is essentially free of friction modifiers. The present invention is also directed to a method for reducing the traction coefficient in internal combustion engines comprising lubricating the internal combustion engines with a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity comprising a blend of two or more isomerized Fischer-Tropsch derived base oils wherein the kinematic viscosity of the blend is in a range from about 2 to about 14 centistokes at 100° C., and (b) one or more lubricating oil additives wherein the lubricating oil composition is essentially free of friction modifiers.

Problems solved by technology

While this approach works well at higher contact speeds, it may increase wear at lower contact speeds if a sufficiently thick lubricating oil cannot be maintained.

Method used

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  • Traction coefficient reducing lubricating oil composition
  • Traction coefficient reducing lubricating oil composition
  • Traction coefficient reducing lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0133]Comparative Formulations A and B and Test Formulation C were prepared as described in Table II below.

TABLE IIIComponentComparativeComparativeTest(wt %)Formulation AFormulation BFormulation CBase OilGroup IIGroup IIIFischer-TropschDerived BaseOilBorated Succinimide3.03.03.0DispersantEthylene Carbonate555Treated SuccinimideDispersantLow Overbased0.70.70.7CalciumSulfonate DetergentMedium Overbased2.42.42.4Calcium SalicylateDetergentHigh Overbased0.90.90.9Sulfurized CalciumPhenate DetergentZinc Di-thiophosphate1.61.61.6Anti-wearDi-phenylamine Anti-0.50.50.5oxidantPhenolic Anti-oxidant0.50.50.5Molybdenum0.40.40.4SuccinimideAnti-oxidantFoam Inhibitors0.160.160.16

example 2

Coefficient of Traction Measurements

[0134]The ability to reduce the coefficient of traction of Text Formulation C was compared to Comparative Formulations A and B was evaluated as described below.

[0135]Comparative Formulations A and B were compared with Test Formulation C in a series of Ball-on-Disk Rheometer experiments. As noted in Table II above, the three Formulations differ only in the selection of the base oils used to make the formulations. The rheometry experiments were designed to measure the traction coefficient under a variety of different conditions. The main variables were:[0136]1. Slide to Roll Ratio (SRR)—which varied from 25 to 50, and to 75.[0137]2. Temperature—all measurements were conducted at a temperature of 100° C. and repeated at a temperature of 120° C.

[0138]3. Pressure—was measured in a configuration with a 19.05 mm diameter steel ball on a flat steel disk, both made of AISI-SAE 52100 steel with Young's Modulus of 207 GPa and Poisson Ratio 0.293, at an appli...

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Abstract

The present invention is directed to a traction coefficient reducing lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity comprising a blend of two or more isomerized Fischer-Tropsch derived base oils wherein the kinematic viscosity of the blend is in a range from about 2 to about 14 centistokes at 100° C., and (b) one or more lubricating oil additives wherein the lubricating oil composition is essentially free of friction modifiers. The present invention is also directed to a method for reducing the traction coefficient in internal combustion engines comprising lubricating the internal combustion engines with a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity comprising a blend of two or more isomerized Fischer-Tropsch derived base oils wherein the kinematic viscosity of the blend is in a range from about 2 to about 14 centistokes at 100° C., and (b) one or more lubricating oil additives wherein the lubricating oil composition is essentially free of friction modifiers.

Description

FIELD OF THE INVENTION[0001]The present invention is directed to a traction coefficient reducing lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity comprising a blend of two or more isomerized Fischer-Tropsch derived base oils wherein the kinematic viscosity of the blend is in a range from about 2 to about 14 centistokes at 100° C., and (b) one or more lubricating oil additives wherein the lubricating oil composition is essentially free of friction modifiers. The present invention is also directed to a method for reducing the traction coefficient in internal combustion engines comprising lubricating the internal combustion engines with a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity comprising a blend of two or more isomerized Fischer-Tropsch derived base oils wherein the kinematic viscosity of the blend is in a range from about 2 to about 14 centistokes at 100° C., and (b) one or more lubricati...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G71/00
CPCC10M107/02C10M111/04C10N2260/14C10N2260/00C10N2240/10C10M169/04C10M2201/087C10M2203/1006C10M2205/173C10M2207/026C10M2207/028C10M2207/262C10M2215/064C10M2215/28C10M2219/046C10M2223/045C10M2227/09C10N2210/06C10N2230/06C10N2230/40C10N2010/12C10N2030/06C10N2040/25C10N2060/00C10N2060/14C10N2030/40
Inventor VAN DAM, WILLEMZIEMER, JAMES
Owner CHEVRON ORONITE CO LLC
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