Lube base oil, lubricating oil composition for internal combustion engine, and lubricating oil composition for drive transmission device
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United States of America Patent
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Jan 31, 2012
Grant Date -
Jan 21, 2010
app pub date -
Mar 14, 2007
filing date -
Mar 15, 2006
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Abstract
The lubricating base oil of the invention satisfies at least one of conditions (a) or (b) below. The lubricating oil composition for an internal combustion engine according to the invention comprises the lubricating base oil of the invention, an ashless antioxidant containing essentially no sulfur as a constituent element, and at least one compound selected from among ashless antioxidants containing sulfur as a constituent element and organic molybdenum compounds. Also, a lubricating oil composition for a power train device according to the invention comprises the lubricating base oil of the invention, a poly(meth)acrylate-based viscosity index improver and a phosphorus-containing compound. (a) The saturated component content is 90% by mass or greater, and the proportion of cyclic saturated components among the saturated components is 10-40% by mass. (b) The condition represented by the following formula (1) is satisfied. 1.440.ltoreq.n.sub.20-0.002.times.kv100.ltoreq.1.453 (1) [wherein n.sub.20 represents the 20.degree. C. refractive index of the lubricating base oil, and kv100 represents the kinematic viscosity at 100.degree. C. (mm.sup.2/s) of the lubricating base oil.]
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