Nissan Motor Company Limited

Jatco Corporation

Infineum International Limited

Idemitsu Kosan Company, Limited

Dynax Corporation

Makoto Maeda

Yasuhiro Murakami

Raymond F Watts

Nobutaka Chiba

Hirokazu Saito

Toshihiko Ichihashi

Takao Ishikawa

Hiroshi Fujita

Kenji Kojima

Katherine M Richard

Hahn Soo Kim

Takao Shibuya

Yoshie Arakawa

Hideki Usuki

Yoshi Arakawa

Yukio Ueda

Tetsuya Ishitani

Gou Katou

Maki Irifune

Takashi Aritake

Thomas Lin

Yasuhiro Mogi

Hiroshi Morisato

A booster additive concentrate may advantageously contain: (a) an anti-wear mixture of two or more phosphite/phosphate compounds and one or more ether/thioether compounds; (b) an ashless dispersant; (c) a calcium-containing detergent, such as an overbased calcium phenate; (d) &#x2265;2 friction modifiers, at least one of which comprises a polyalkylene polyamine succinimide derivative; (e) optionally a corrosion inhibitor; and (f) a lubricating oil basestock. Based on these additive components, the booster additive concentrate may exhibit specific contents of B/Ca/P and may contain minimal or substantially no additional antioxidants. Lubricant compositions can be made from the booster additive concentrates and a fresh/used lubricant oil composition 'diluent,' which can rejuvenate the diluent. Such lubricant compositions can have advantageous anti-shudder durability (ASD) lifetimes and other frictional properties. In particular, such concentrates/compositions can offer superior lubrication when used in vehicles with continuously variable transmissions (CVTs).

Rejuvenation and/or extension of the lifetime of frictional performance in transmission fluids

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

A zinc-free lubricating composition for lubricating a continuously variable transmission is disclosed, the lubricating composition comprising a mixture of a major amount of a lubricating oil and an effective amount of a performance enhancing additive combination comprising: (a) an ashless polyisobutenyl succinimide dispersant; (b) at least one organic thioether phosphite; (c) a calcium phenate overbased detergent at a concentration such that the total amount of calcium in the fluid is less than about 500 ppm; (d) friction modifiers comprising one or more succinimides and one or more ethoxylated amines; and (e) a primary amide of a long chain carboxylic acid.

Zinc-free continuously variable transmission fluid

A wet paper friction material, mainly used for a slip lock-up of an automatic transmission, obtained by impregnating a paper material with a thermosetting resin, thermosetting, and molding under pressure, to attain compatibility between a good frictional characteristic and good fatigue strength under compression, wherein the paper material, in addition to a cellulose pulp and a filler, contains 30 to 80 wt % of aramid pulp with its drainability being adjusted to 250 to 440 ml in a total amount of pulp, and further contains, as a friction modifier, diatomaceous earth cylindrically formed so as to be net-like in the cylinder part and having its mean length 4 to 6 .mu.m.

Wet type paper friction material with combined improved friction

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Shizuoka, Japan

Makoto Maeda