LUBRICATING OIL COMPOSITION FOR AUTOMATIC TRANSMISSION

Title:

LUBRICATING OIL COMPOSITION FOR AUTOMATIC TRANSMISSION

Document Type and Number:

WIPO Patent Application WO/2010/087398

Kind Code:

A1

Abstract:

A lubricating oil composition for automatic transmissions, characterized by comprising (A) a lube base oil having a dynamic viscosity at 100ºC of 1.5-20 mm2/s, (B) a polymethacrylate-based viscosity index improver, and (C) a sulfur compound having an acid value of 1.0 mg-KOH/g or lower and represented by general formula (1). S-(CH2CH2COOR)2 (1) (In the formula, R represents a C8-30 hydrocarbon group.) Provided is the lubricating oil composition for automatic transmissions which has a high transmission torque capacity and satisfactory gear change shock characteristics and attains excellent fuel efficiency. Also provided is the lubricating oil composition for automatic transmissions which is a lubricating oil having a low viscosity and a high viscosity index and which, despite this, not only has excellent shear stability and fatigue resistance (durability) but also has a high transmission torque capacity and satisfactory gear change shock characteristics and attains excellent fuel efficiency.

Inventors:

NARITA KEIICHI (JP)

Application Number:

PCT/JP2010/051124

Publication Date:

August 05, 2010

Filing Date:

January 28, 2010

Export Citation:

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Assignee:

IDEMITSU KOSAN CO (JP)
NARITA KEIICHI (JP)

International Classes:

C10M169/04; C10M133/56; C10M135/26; C10M145/14; C10M159/22; C10M159/24; C10N10/04; C10N20/00; C10N20/02; C10N20/04; C10N30/02; C10N30/06; C10N40/04

Domestic Patent References:

WO2005078054A1	2005-08-25
WO2004074414A1	2004-09-02
WO2006073198A1	2006-07-13

Foreign References:

JPH09328697A	1997-12-22
JPH09263782A	1997-10-07
JP2004051758A	2004-02-19
JPH09194868A	1997-07-29
JPH10279980A	1998-10-20
JP2008179662A	2008-08-07
JPS5392808A	1978-08-15
JP2006117852A	2006-05-11

Other References: