A lubricating oil base oil may include a solid surface distance of 1.0 nm or more at a surface pressure of 12.4 MPa and a normalized peak intensity ratio of more than 0.2 to 1.0 measured using a resonance shear measurement system and a lubricating oil composition may include the lubricating oil base oil.

The instant disclosure relates to hydrocarbyl- (e.g., alkyl-) benzene sulfonate detergents and their salts, where the hydrocarbyl group includes moieties equivalent to 5 to 10 carbon branched polyene compounds. Such compounds and their salts are useful as lubricant additives. The detergents disclosed herein may solve at least one problem of providing anti-wear performance, frictional performance, oxidation performance, viscosity performance, and detergency.

The present disclosure relates to a lubricant composition comprising a first phosphorus compound, a second phosphorus compound, and a third phosphorus compound, wherein the first phosphorus compound is present in the lubricant composition in an amount to provide between about 120 and 350 ppm phosphorus. The lubricant composition may provide robust anti-wear and reduced pitting.

An object of the present invention is to provide a lubricant base oil for power transmission that has a high traction coefficient and a high flash point, and excellent low-temperature fluidity. The present invention relates to a lubricant base oil for power transmission containing a compound represented by formula (1):

##STR00001##

wherein R.sup.1 to R.sup.5 are the same or different, and each represents a hydrogen atom or a C.sub.1-4 linear or branched alkyl group, any two of R.sup.1 to R.sup.5 may bind to each other to form a C.sub.1-4 alkylene group, two R.sup.1s, two R.sup.2s, two R.sup.3s, two R.sup.4s, and two R.sup.5s may be individually the same or different, X is obtained by removing two hydroxyl groups from a C.sub.4-12 branched aliphatic diol and represents a divalent group containing no quaternary carbon, and the two hydroxyl groups are each of a primary alcohol.

A grease composition is intended primarily for use in constant velocity joints (CV joints), especially ball joints and/or tripod joints, which are used in the driveline of motor vehicles. The grease composition for use in constant velocity joints comprises at least one base oil, at least one thickener, zinc sulfide, as well as molybdenum disulfide and/or tungsten disulfide. Further, a constant velocity joint comprises the grease composition.

A grease composition is intended primarily for use in constant velocity joins (CV joints), especially ball joints and/or tripod joints, which are used in the drivelines of motor vehicles. The grease composition for use in constant velocity joints comprises at least one base oil, and least one thickener, at least one copper sulfide in an amount of approximately 0.01 wt-% up to approximately 1.5 wt-% of the grease composition, molybdenum disulfide and/or at least one phosphor-free organic molybdenum complex in an amount of approximately 0.1 wt-% up to approximately 5.0 wt-% of the grease composition. Further, a constant velocity joint comprises the grease composition.

An object of the present invention is to provide a lubricant base oil for power transmission that has a high traction coefficient and a high flash point, and excellent low-temperature fluidity. The present invention relates to a lubricant base oil for power transmission containing a compound represented by formula (1): ##STR00001##
wherein R.sup.1 to R.sup.5 are the same or different, and each represents a hydrogen atom or a C.sub.1-4 linear or branched alkyl group,
any two of R.sup.1 to R.sup.5 may bind to each other to form a C.sub.1-4 alkylene group, two R.sup.1s, two R.sup.2s, two R.sup.3s, two R.sup.4s, and two R.sup.5s may be individually the same or different, X is obtained by removing two hydroxyl groups from a C.sub.4-12 branched aliphatic diol and represents a divalent group containing no quaternary carbon, and the two hydroxyl groups are each of a primary alcohol.

The disclosed technology relates to a traction fluid containing a base fluid having at least one of cedrene, cedrol, thujopsene or mixtures thereof, preferably provided from cedar oil, as well as a method of lubricating a power transmission apparatus with the traction fluid.

The invention discloses a lubricating grease with thixotropy and a preparation method thereof. The lubricating grease comprises a polyurea/high base number calcium sulfonate composite thickener, colloidally dispersed calcium carbonate solid particles in the form of calcite, a calcium borate or calcium borate composite, and a calcium soap of fatty acid having 12 to 24 carbon atoms. The above components are uniformly dispersed in an oil phase medium. The content of high base number calcium sulfonate in the lubricating grease is less than 22 wt %.

A composition obtained by reacting an O,O′-dialkyldithiophosphoric acid with a hydroxyalkyl acrylate or a hydroxyalkyl methacrylate, and reacting the product thereof with a dialkylphosphite provides good antiwear protection.