Abstract: 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 mm2/s or less at 40° C.: (A): a mineral-based oil and/or hydrocarbon-based synthetic oil having a kinematic viscosity of 3.5 to 7 mm2/s at 100° C., and (B): a mineral-based oil and/or hydrocarbon-based synthetic oil having a kinematic viscosity of 20 to 52 mm2/s at 100° C.

Abstract: 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 mm2/s or less at 40° C.: (A): a mineral-based oil and/or hydrocarbon-based synthetic oil having a kinematic viscosity of 3.5 to 7 mm2/s at 100° C., and (B): a mineral-based oil and/or hydrocarbon-based synthetic oil having a kinematic viscosity of 20 to 52 mm2/s at 100° C.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A traction fluid comprising:(i) a diesteric compound or its derivative represented by the formula ##STR1## wherein A' is an ester linkage of --COO-- or --OOC--, n is a number having a value of from 1 to 10, R.sub.1 is independently selected from hydrogen and alkyl groups containing from 1 to 8 carbons, and R.sub.2 is independently selected from hydrogen and alkyl group containing from 1 to 3 carbons; and(ii) from 0.1 to 95% by weight of a branched poly-.alpha.-olefin .

Abstract: 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;R.sub.1 is independently selected from hydrogen and C.sub.1 to C.sub.8 alkyl groups, andR.sub.2 is independently selected from hydrogen and C.sub.1 to C.sub.3 alkyl groups.

Abstract: 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.

Abstract: 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;R.sub.1 is hydrogen or a C.sub.1 -C.sub.8 alkyl; andR.sub.2 is a C.sub.1 to C.sub.3 alkyl group.

Abstract: A traction fluid comprising:(i) an ester or its derivative represented by the formula: ##STR1## wherein A' is an ester linkage of --COO-- or --OOC--, n is an integer of from 1 to 14, R.sub.1 is selected from hydrogen and C.sub.1 to C.sub.8 alkyl radicals, and R.sub.2 is independently selected from hydrogen and C.sub.1 to C.sub.3 alkyl radicals; and(ii) from 0.1 to 95% by weight of a polymer selected from hydrocarbonic polymers and polyesters.

Abstract: 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.

Abstract: A traction fluid comprising a diester or its derivative represented by the formula ##STR1## wherein: A40 is an ester linkage of --COO-- or --OOC--;n is an integer of 1 to 6;R.sub.1 is independently selected from hydrogen and alkyl groups containing 1 to 8 carbon atoms; andR.sub.2 is independently selected from alkyl groups containing from 1 to 3 carbon atoms.

Abstract: 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.

Abstract: A synthetic lubricating fluid comprising:(i) an ester or its derivative of cyclohexanol and cyclohexanecarboxylic acid represented by the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from hydrogen and alkyl groups containing from 1 to 8 carbon atoms; and(ii) from 1 to 70% by weight of a branched poly-.alpha.-olefin.