摘要:
A grease composition for constant velocity joints comprises the following components: (a) a base oil; (b) a diurea type thickening agent; (c) a molybdenum sulfurized dialkyl dithiocarbamate; (d) molybdenum disulfide; (e) at least one sulfur-phosphorus-containing extreme-pressure agent selected from the group consisting of zinc dithiophosphate compounds and thiophosphates; and (f) a fatty acid amide. The grease composition of the present invention has a high ability of reducing the induced thrust force and is excellent in the durability.
摘要:
A heat resistant grease composition containing a fluorosilicone base oil, a fluororesin thickener and an additive, that has a reduced gelling, reduced base oil evaporation, and stable heat resistance.
摘要:
A grease composition for constant-velocity joints which is prepared by blending a lube base oil with (A) a urea-urethane thickening agent comprising a mixture of (a) 20 to 95 mole % of a diurea compound of the formula (1): ##STR1## (b) 4 to 50 mole % of a urea-urethane compound of the formula (2): ##STR2## and (c) 1 to 50 mole % of a diurethane compound of the formula (3): ##STR3## with each mole percentage being based on the total amount of the components (a) to (c), wherein a ratio of the total number of R.sup.2 --NH--, R.sup.3 --NH-- and R.sup.5 --NH-- groups contained in the mixture to the total number of R.sup.6 --O--, R.sup.8 --O-- and R.sup.9 --O-- groups contained therein lies between 40:60 and 95:5, (B) at least one compound selected from oxidized paraffins, diphenyl hydrogenphosphite and hexamethylphosphoric triamide, and (C) at least one organomolybdenum compound selected from molybdenum dithiophosphate and molybdenum dithiocarbamate.
摘要:
A lubricative composition which can retain lubricating oil or grease without degrading it, which is heat-resistant and mechanically strong, and can be used continuously for a much longer time than conventional ones without the possibility of shortage of lubricant supply. It includes a first component, which is a modified silicone oil having reactive organic groups, a second component, which is a curing agent having organic groups that react with the reactive organic groups, and a third component, which is a lubricating oil or grease. The third component is retained in a three-dimensionally reticulated structure of silicone formed by polymerizing the first and second components in the third component. The third component has no compatibility with either the first or second components. The lubricating oil or grease retained in the lubricative composition can ooze out through the pores that communicate with each other onto the surface of the lubricative composition, so that the composition will exhibit lubricating properties stably for a long period of time. By adding a high-viscosity synthetic hydrocarbon oil to the base oil of the lubricating oil or grease, it is possible to positively prevent separation of oil during hardening.
摘要:
A grease composition comprising a base oil containing not less than 10% by weight of an ester oil based on the total base oil and having a kinematic viscosity of 50 to 200 mm.sup.2 /sec at 40.degree. C. and 15 to 35% by weight, based on the total grease composition, of a diurea compound represented by formula (I): ##STR1## wherein R.sub.2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms; and R.sub.1 and R.sub.3, which may be the same or different, each represent an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aliphatic hydrocarbon group having 8 to 20 carbon atoms, the proportion of the aromatic hydrocarbon groups in the total of R.sub.1 and R.sub.3 being 50 to 100 mol %. When applied to outer race rotating bearings, the grease composition is excellent in flaking resistance, leak resistance, and low noise properties and prevents premature seizing under high temperature and high speed conditions.
摘要:
Disclosed is a lubricating grease suitable for high temperature use, consisting essentially of 60 to 90% by weight of a base oil mixture comprising at least one mineral oil and at least one synthetic oil, 5 to 17% by weight of at least one urea compound as a thickener, wherein the at least one urea compound is a reaction product of at least one fatty amine and at least one isocyanate or at least one diisocyanate, 2 to 20% by weight of calcium complex grease, 1 to 4% by weight of molybdenum disulphide, 0.2 to 1% by weight of graphite powder, 0.2 to 1% by weight of polytetrafluoroethylene powder, 0.2 to 1% by weight of solid particles of at least one organo-molybdenum compound selected from a molybdenum dithiocarbamate and a molybdenum dithiophosphate, up to 2% by weight of a metal deactivator and up to 2% by weight of a corrosion inhibitor.
摘要:
A grease composition sealed in a rolling contact bearing contains a base oil in the form of a mixture of an alkyldiphenylether oil and a poly-.alpha.-olefin oil. The weight ratio of the former to the latter is between 20:80 and 80:20. 5-40% by weight of thickening agent which is at least one of an aromatic diurea compound and an aromatic urea-urethane compound is added to the base oil. Further, a passivation oxidizing agent and an organic sulfonate are added.
摘要:
A grease composition for constant velocity joint, particularly Zeppa type joint comprises a base oil and contains (A) a particular diurea compound as a thickener, (B) molybdenum sulfide dialkyldithiocarbamate, (C) an extreme pressure additive of zinc dithiophosphate, (D) a sulfur-phosphorus series extreme pressure additive containing no metallic element and having a sulfur content of 10-30% by weight and a phosphorus content of 0.5-5% by weight, and (E) lead dialkyldithiocarbamate as an essential component.
摘要:
A grease composition for a high speed anti-friction bearing contains, in a synthetic lubricant base oil, (A) 2 to 30 wt. % of a thickening agent consisting of an urea comopund, (B) 0.2 to 30 wt. % of sorbitan monooleate, (C) 0.2 to 3.0 wt.% of barium sulfonate, and (D) 0.2 to 3.0 wt. % of barium lanolate, as indispensable components, each weight percentage being based on the total weight of the composition.