Patent ID: 6229676
Filing Date: 2001-05-08
Classification: F16C,F16J,G11B

Abstract:
A hard disk drive, comprising:a base;a magnetic disk rotatably mounted to the base;an actuator having a magnetic head for magnetically reading data from or magnetically writing data to the disk, the actuator being pivotally mounted to the base adjacent to the disk for relative movement thereto;a motor having a stationary housing and a rotatable shaft for supporting the actuator, the housing and the shaft being concentric with an axis of the motor;a bearing mounted between the shaft and the housing;a support member mounted to the shaft;a magnetic conductor axially spaced apart from the support member and mounted to the housing so that the magnetic conductor and the support member are rotatable relative to each other;a magnet mounted to the support member between the support member and the magnetic conductor;a ferrofluid located between the magnet and the magnetic conductor for sealing the bearing in the housing;a second housing on the motor;a second bearing mounted between the shaft and the second housing, the second bearing being axially spaced apart from said bearing;a second magnetic conductor mounted to the second housing so that the second magnetic conductor and the support member are rotatable relative to one another; anda second ferrofluid located between the magnet and the second magnetic conductor for sealing the second bearing in the second housing.