Idemitsu Kosan Company, Limited

Nissan Motor Company Limited

Jatco Corporation

Toshihiko Ichihashi

Yoshitaka Tamoto

Hideo Igarashi

Toshiki Ikeda

Hiroshi Fujita

Kenji Kojima

Junichi Deshimaru

Makoto Maeda

Masato Yokomizo

Yoshie Arakawa

Noboru Sonoda

Hideki Usuki

Hiroshi Shirosawa

A lubricating oil composition for a continuously variable transmission contains at a specific content: (A) a mineral oil or PAO having a sulfur content of 0.03 mass % or less and a kinematic viscosity at 100 degrees C. from 1.5 mm/s to 3 mm/s; (B) a mineral oil or PAO having a sulfur content of 0.03 mass % or less and a kinematic viscosity at 100 degrees C. from 5.5 mm/s to 8 mm/s; (C) PAO having a kinematic viscosity at 100 degrees C. from 30 mm/s to 400 mm/s; and (D) a polymethacrylate having a mass average molecular weight of 10000 to 40000, in which the total content of the components (C) and (D) is 19 mass % or more and the lubricating oil composition has a kinematic viscosity at 100 degrees C. from 5.5 mm/s to 6.5 mm/s and a kinematic viscosity at &#x2212;20 degrees C. of 680 mm/s or less.

Method for lubricating a continuously variable transmission, and a continuously variable transmission

An object of the present invention is to provide a lubricating oil composition having a low viscosity and an extremely high viscosity index as well as an excellent shearing stability. The present invention relates to a lubricating oil composition including the following components (A) to (C):

Lubricating oil composition and automotive transmission oil using same

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&#xd7;10mm/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.

Lubricating oil composition for continuously variable transmissions

Disclosed is a lubricating oil composition, which comprises a base oil and additives of (A) a dithiocarbamate compound and (B) a condensate of a branched chain fatty acid having from 8 to 30 carbon atoms and an amine, and optionally (C) an amine-type antioxidant. The composition has an excellent shudder-preventing ability and has a long shudder-preventing life.

Lubricating oil composition

Disclosed is a lubricating oil composition for automatic transmissions, which comprises a base oil and additives of (A) a sulfur-containing antioxidant or an amine-type antioxidant, (B) a phosphate or its amine salt, and (C) a reaction product of a carboxylic acid and an amine. The composition has an excellent ability to prevent the brake lining of the clutch of automatic transmissions from shuddering, and can maintain the shudder-preventing ability for a long period of time.

Lubricating oil composition for automatic transmission

Lubricant composition for continuous variable transmissions and method

Lubricating oil composition for high-speed gear

A lubricating oil composition having improved temperature characteristics is disclosed, containing: (A) a base oil having a kinematic viscosity at 100.degree. C. of 1.5 to 50 cSt, a pour point of -25.degree. C. or lower and a viscosity index of at least 60; (B) an ethylene-.alpha.-olefin copolymer having a number average molecular weight of 1,000 to 8,000; and (C) at least one additive selected from an extreme pressure agent, an anti-wear agent, an oiliness agent and a detergent dispersant. The present composition has a high viscosity index and exhibits good temperature characteristics, particularly low temperature characteristics, and further is excellent in shear stability, extreme pressure properties, wear resistance, detergency and so on. Thus it is useful as a gear oil for cars or industrial machines, an internal combustion engine oil, an automatic transmission oil and so on.

Lubricating oil composition having improved temperature characteristics

The present invention relates to a lubricating oil composition comprising:

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Ichihara, Japan

Toshihiko Ichihashi