摘要:
A drive device includes a slide bearing; a shaft that passes through the slide bearing; a gear that is fixed to the shaft; and a grease composition that is held in a clearance between the slide bearing and the shaft. At least one of the slide bearing and the shaft is made of a resin. The clearance is in a range of 10 to 110 μm. The grease composition contains a hydrocarbon base oil and lithium soap serving as a thickener. A weight ratio of the hydrocarbon base oil to the lithium soap is in a range of 94.5:5.5 to 96.0:4.0. A consistency of the grease composition is in a range of 360 to 400.
摘要:
There is provided a grease composition containing an edible oil as a base oil and calcium stearate as a thickener, wherein a structure stabilizer for preventing thermal hardening is added and an unworked penetration after heating at 100° C. for 100 hours is 77 or more, and a rolling bearing in which the grease composition is sealed.
摘要:
A calcium complex grease composition is disclosed. The grease composition has a high dropping point and a suitable thickness and is stable to heat.
摘要:
Embodiments of the invention include compositions of calcium/lithium complex greases containing calcium/lithium soaps having a high calcium fraction and complexing agents, encapsulated constant velocity shafts containing such lubricating greases and the use of the lubricating greases in encapsulated shafts of constant velocity shafts.
摘要:
This invention provides a method for improving the physico-chemical and usage properties of an existing lubricant, of a solid or liquid consistency, such as gear oils, engine oils and all-purpose oils. The method is based on complementing the composition of the existing lubricant with a mixture of several solid substances (thickeners), in an amount varying from 5 to 35 weight percent of the initial existing lubricant. As a result of their addition, a considerable improvement in a number of the lubricant's properties is achieved. For example, an increase in saturation load, as measured on a 4-ball apparatus of 1600 N to 3150 N; improved friction coefficient μ, the wear scar under 600 N load, and more. Using the method specified in the invention, it is possible to make significant improvements to the quality of a lubricant at relatively low cost.
摘要:
A process and corresponding apparatus and system for use in preparing soaps from fatty acid containing oil compositions, and in turn, for preparing greases by the use of such soaps in combination with one or more base oils.
摘要:
In a grease composition which essentially comprises a base oil and a thickener, a mixture of a urea compound and lithium soap is blended as the thickener. The content of the urea compound in the thickener is preferably set to 20 to 80 wt %. As the urea compound, an alkyl group- or cyclohexyl group-terminated diurea compound, or, particularly, a diurea compound in which the diisocyanate component is 4,4′-diphenylmethane diisocyanate is preferably used. In a rolling bearing which is lubricated by the grease composition, the acoustic performance is largely improved by a synergistic action of the lithium soap and the urea compound, and simultaneously also the anti-fretting property is enhanced by an action of the urea compound.
摘要:
This invention relates to a thickener component based on an aluminium carboxylate compound and to an aluminium complex grease made therefrom with addition of a base liquid.
摘要:
A lubricating grease composed of a base oil combination comprising 10 to 35% of one or more poly &agr;-olefins, 3 to 15% of one or more synthetic organic esters, 20 to 30% of one or more naphthenic oils, the remainder of the combination being one or more paraffinic oils, the percentages being by weight of the total base oil combination and the ratio of the weight of the ester(s) in the combination to the weight of the poly &agr;-olefin(s) therein being not greater than 1:3; between 2 and 15 % by weight of the total grease of a lithium soap thickener, between 1 and 5% by weight of the total grease of a molybdenum dithiophospbate; between 1 and 5% by weight of the total grease of a zinc dialkyldithiophosphate; between 1 and 5% by weight of the total grease of a sulphur-free friction modifier, and some or all of the normal grease additives such as anti-oxidants, corrosion inhibitors, extreme pressure additives and tackiness agents.
摘要:
Disclosed is a bearing assembly that includes a bearing insert that engages a bearing housing at an interface. In accordance with the invention, the interface is lubricated with a lubricant that provides sufficient lubrication such that the breaking housing torque required to initiate relative movement of the outer portion and housing is no greater than 130% of the moving housing torque required to maintain relative movement of the outer portion and housing. The lubricant preferably is a fatty acid, such as stearic acid or palmitic acid. In accordance with highly preferred embodiments of the invention, the lubricant comprises a grease composed of a base lubricating oil that is thickened with a fatty acid that is substantially uniformly dispersed therein.