Rolling device for information apparatus
AssigneeMinebea Co., Ltd.
InventorMotoharu Akiyama
Life of this patent
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Abstract
A rolling device is made up of a plurality of rolling bodies provided between an outer member having a first contact face with each of the plurality of rolling bodies and an inner member having a second contact face with each of the plurality of rolling bodies wherein the plurality of rolling bodies individually are able to roll relative to the first and second faces. A grease composition is sealedly filled in between the outer member and the inner member and contains a carbonate compound serving as a base oil, a lithium soap serving as a thickener, and at least one organomolybdenum compound selected from the group consisting of a molybdenum dithiophosphate and a molybdenum dithiocarbamate.
Claims14
A rolling device comprising a plurality of rolling bodies provided between an outer member having a first contact face with each of the plurality of rolling bodies and an inner member having a second contact face with each of the plurality of rolling bodies, the plurality of rolling bodies individually being able to roll relative to the first and second faces, wherein a grease composition is sealedly filled inbetween said outer member and said inner member and comprises:
- a carbonate compound of the following general formula (i) serving as a base oil
- wherein R and R′ may be the same or different and independently represent a branched alkyl group having from 13 to 15 carbon atoms;
- a lithium soap serving as a thickener;
- and
- at least one organomolybdeniun compound selected from the group consisting of a molybdenum dithiophosphate of the general formula (ii)
- wherein R1, R2, R3 and R4 independently represent an alkyl group having from 1 to 24 carbon atoms or an aryl group having from 6 to 30 carbon atoms, and a molybdenum dithiocarbamate of the general formula (iii)
- wherein R5, R6, R7 and R8 independently represent an alkyl group having from 1 to 24 carbon atoms, and X represents O or S.
In a rolling device used in spindle motors in an information device and comprising a plurality of rolling bodies provided between an outer member having a first face in contact with each of the plurality of rolling bodies and an inner member having a second face in contact with each of the plurality of rolling bodies, each of the plurality of rolling bodies being able to roll relative to the first and second faces, the improvement characterized in that a grease composition comprising:
- a carbonate compound of formula (i) serving as a base oil
- wherein R and R′ may be the same or different and independently represent a branched alkyl group having from 13 to 15 carbon atoms;
- a lithium soap serving as a thickener;
- and
- at least one organomolybdenum compound selected from the group consisting of a molybdenum dithiophosphate of formula (ii)
- wherein R1, R2, R3 and R4 independently represent an alkyl group having from 1-24 carbon atoms or an aryl group having from 6 to 30 carbon atoms, and a molybdenum dithiocarbamate of formula (iii)
- wherein R5 , R6, R7 and R8 independently represent an alkyl group having from 1 to 24 carbon atoms, and X represents O or S, is sealedly filled in between said outer member and said inner member.
Dependencies are inferred from the claim text.