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AssigneeNsk Ltd.
InventorsKatsuaki Denpo, Atsushi Yokouchi, Koichi Hachiya, Michiharu Naka, Tooru Shouda, Hideki Koizumi
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This invention is to provide a conductive grease which is less to decrease conductivity as a time passes. The conductive grease comprises abase oil, a thickener, a conductive solid powder, and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein an amount of the conductive solid powder added is 0.1 to 10 wt %, and an amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt %. Further, the conductive grease comprises the base oil and at least one of conductive additives, and the conductive additives are fibrous carbon, metallic particle, metallic compound particle and carbon nano-tube. The conductive grease to be packed into the rolling bearing comprises conductive fine particles such as carbon black and has an oil separation degree of 2% or lower. A ball bearing to be favorably used at high temperature comprises an inner race and an outer race, and a plurality of balls freely rotating between both races, and the conductive grease packed into a space defined between both races and holding the plural balls therein, and the conductive grease comprises the base oil, a thickener comprising fluorine compound or silicone compound and 0.2 to 10 wt % of the carbon black.
A conductive grease comprising a base oil, a thickener, a conductive solid powder and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein an amount of the conductive solid powder added is 0.1 to 10 wt % based on the total weight of the grease, and a total amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt % based on the total weight of the grease, wherein the conductive solid powder is selected from the group consisting of carbon black and acetylene black which each is a particle comprising as a main component a fibrous carbon, wherein the thickener is selected from the group consisting of a metallic soap and a urea compound, each addition amount thereof being 5 to 20 wt % based on a total weight of the grease, and a total amount of the thickener and the conductive solid powder is 5.1 to 20.1 wt % based on the total weight of the grease, wherein the wear inhibitor is at least one kind selected from the group consisting of orthophosphoric acid ester and phosphorous acid ester, wherein the extreme pressure agent is at least one kind selected from the group consisting of a metallic dithiophosphate compound and a metallic dithiocarbamate compound, and wherein the oiliness agent is at least one kind selected from the group consisting of succinic acid ester, carboxylic acid anhydride and alkenyl succinic acid anhydride.
A conductive grease comprising a base oil, a thickener, a conductive solid powder and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein the conductive solid powder is carbon black, an amount of carbon black being 0.2 to 10 wt % based on the total weight of the grease, and a total amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt % based on the total weight of the grease, wherein the base oil is a straight chain or side chain perfluoroalkylpolyether, perfluoroalkylpolyether introducing a carboxyl or isocyanate group into terminal group thereof, ester-modified or alcohol-modified perfluoroalkylpolyether, or a single or a mixture of at least two kinds of fluorine oil, silicone oil and fluorosilicone oil, the kinematic viscosity thereof being 15 mm2/s to 500 mm2/s at 40° C., and wherein the thickener comprises as a main component at least one selected from the group consisting of silicone compound and fluorine compound.
A conductive grease comprising a base oil, a thickener, a conductive solid powder and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein an amount of the conductive solid powder added is 0.1 to 10 wt % based on the total weight of the grease, and a total amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt % based on the total weight of the grease, and wherein the conductive solid powder is carbon nano-tube having diameter of 1 to 24 nm and length of 0.5 to 30 μm.
A rolling apparatus comprising an outer member, an inner member and a plurality of rolling elements rotatably arranged between the outer and inner members, and being packed with a conductive grease applied between the inner and outer members and the rolling elements, said conductive grease comprising a base oil, a thickener, a conductive solid powder, and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein an amount of the conductive solid powder added is 0.1 to 10 wt % based on the total weight of the grease, and a total amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt % based on the total weight of the grease, wherein the conductive solid powder is selected from the group consisting of carbon black and acetylene black which each is a particle comprising as a main component a fibrous carbon, an addition amount of the thickener is 5 to 20 wt % based on a total weight of the grease, and a total amount of the thickener and the conductive solid powder is 5.1 to 20.1 wt % based on the total weight of the grease.
Dependencies are inferred from the claim text.