Pivot assembly bearing
AssigneeMinebea Co., Ltd.
InventorMotoharu Akiyama
Life of this patent
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Abstract
A pivot assembly bearing used in an information storage device maintains its capabilities for a longer period of time under frequent quick starting and stopping by containing a grease composition made up of a base oil, a thickener and an extreme-pressure agent.
Claims7
In an information storage device for storing and/or reading out information on a disk by means of a magnetic head supported by a head actuator and pivoted by a pivot assembly bearing, the improvement comprising said pivot assembly bearing being sealed with a grease composition comprising a base oil having a dynamic viscosity of 40 to 80 mm2/sec at 40° C. and containing a mineral oil and a synthetic hydrocarbon oil in a mass ratio of mineral oil:synthetic hydrocarbon oil of 1:0.5 to 1:2, a thickener and an extreme pressure agent.
Dependencies are inferred from the claim text.