Lubricating oil composition for continuously variable transmissions
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United States of America Patent
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Jul 15, 2014
Grant Date -
Apr 29, 2010
app pub date -
Feb 6, 2008
filing date -
Mar 14, 2007
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Abstract
A lubricating base oil contains: an overbased calcium sulfonate having a different base number provided such that a total base number is in a range of 280 to 500 mgKOH/g and a calcium concentration in a total amount is in a range of 280 to 3000 mass ppm (in terms of calcium); and orthophosphates that is at least one selected from phosphates and acid phosphates and provided such that a phosphorus concentration is 50 mass ppm or more. A high friction coefficient of 0.11 or more and a favorable wear resistance of a specific wear rate of less than 2.0×10−8 mm3/Nm are obtained, thereby reliably providing a high power transmission capacity for a long period of time, particularly in a belt-type continuously variable transmission equipped with a metallic belt.
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