Toa Nenryo Kogyo, K. K.

Tonen Corporation

Toyota Jidosha Kabushiki Kaisha

Exxonmobil Research and Engineering Company

Tonengeneral Sekiyu K.k.

Tonengeneral Sekiyu Kabushiki Kaisha

Narihiko Yoshimura

Hirotaka Tomizawa

Akihiko Ichikawa

Yasuji Komatsu

Takanori Nakada

Yasuyoshi Suzuki

Makoto Kanbara

Michihide Tokashiki

Yasushi Ando

Fumio Ueda

Takanori Kugimiya

Tomohiro Kato

Junichi Mitsui

Kenji Ueno

Koji Saito

Kiyonari Ishikawa

Asep Handaya Saputra

Tatsuji Suganuma

Kouji Saitoh

Hiroshi Hirano

Tetsuo Ishii

Koji c/o Tonengeneral Sekiyu KK Saito

The present invention provides a gear oil composition for vehicle driving systems, more specifically a gear oil composition for vehicle final reduction gears, which can improve a fuel-saving effect by reducing its viscosity and, at the same time, secure bearing fatigue life characteristics. The gear oil composition comprises a base oil (A) and another base oil (B), described below, and at least one species of additive for gear oil, and has a kinematic viscosity of 80 mm/s or less at 40&#xb0; C.:

Gear oil composition

To provide an oil composition for automatic transmission having high wet friction torque capacity and shudder preventing performance, and excellent also in durability of shudder preventing performance as an automatic transmission oil for lock-up clutch and slip control.

Oil composition for automatic transmission

The lubricant composition of the present invention can be used in automatic transmissions and contains 0.05 to 2% of a metallic salt of organic acid (component (A)), such as calcium sulfonate, 0.15 to 4% of a specific polyamide compound (component (B)) and 0.05 to 1.5% of acid phosphate or acid phosphite ester (component (C)) which are added to a lubricant base oil, wherein all percentages are by weight in the total lubricant composition. The lubricant composition for automatic transmissions can show high anti-shudder property, high anti-shudder durability for an extended period, high property of preventing clogging of the friction material, and sufficient transmission torque capacity, while retaining the lubricant characteristic requirements for use in automatic transmissions.

Lubricant compositions for automatic transmissions

An electro-rheological fluid comprising an electrically insulating liquid as the dispersion medium, porous solid particles as the dispersed phase, a dispersant, and a polyhydric alcohol having a boiling point of not lower than 250.degree. C., a melting point of not higher than 15.degree. C. and a viscosity of not higher than 300 cp (as measured at 20.degree. C.), or comprising an electrically insulating liquid as the dispersion medium, porous solid particles as the dispersed phase, a polyhydric alcohol and/or water, and an ashless dispersant.

Stable electro-rheological fluid having a high viscosity-increasing

Traction fluid composition comprising a cyclohexyl diester and branched

A synthetic lubricating fluid comprising at least one ester or its derivative represented by the formula ##STR1## wherein: n is an integer of 0 to 5 and m is an integer of 0 to 5, with the proviso that the sum of n+m is 1 to 10 inclusive;

Synthetic traction fluid

A synthetic traction fluid comprising, as a base oil, at least one ester or its derivative selected from monoesters or their derivatives, and triesters or their derivatives represented by the formula ##STR1## wherein Y is independently selected from ##STR2## and --OH with A' being an ester linkage and R.sub.1 being independently selected from hydrogen and C.sub.1 to C.sub.8 alkyl groups, with the proviso that at least one Y is ##STR3## and R.sub.2 is independently selected from hydrogen and C.sub.1 to C.sub.3 alkyl groups.

A traction fluid comprising at least one compound selected from diesters or monoesters represented by general formulas ##STR1## wherein: A is an ester linkage ##STR2## n.sub.1 and n.sub.2 are independently integers having a value of from 0 to 5 inclusive;

Traction fluid

A synthetic traction fluid comprising, as a base oil, at least one ester or its derivative selected from monoesters, diesters, triesters and derivatives thereof represented by the formula: ##STR1## where Y is independently selected from ##STR2## --(CH.sub.2)n--OH A' is an ester linkage, n is an integer of 1 to 3, and R.sub.1 is independently selected from hydrogen and alkyl groups having 1 to 8 carbon atoms, with the proviso that at leas tone Y is ##STR3##

A traction fluid comprising a diester or its derivative represented by the formula ##STR1## wherein: A40 is an ester linkage of --COO-- or --OOC--;

A traction fluid comprising a diester or its derivative represented by the formula: ##STR1## wherein A' is an ester linkage, n is an integer of 1 to 10, R.sub.1 is independently selected from hydrogen and C.sub.1 to C.sub.8 alkyl groups, and R.sub.2 is the same or different and is selected from hydrogen and C.sub.1 to C.sub.3 alkyl groups.

A synthetic lubricating fluid comprising:

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Saitama, Japan

Narihiko Yoshimura