Pivot bearing cartridge including ball bearing set and magnet element for ball bearing set pre-loading

A head stack assembly comprising:

• rotary actuator including bore;
• and
• a pivot bearing cartridge including:
• a pivot shaft including a central axis, a shaft body and a shaft distal end;
• a pivot sleeve disposed about the pivot shaft, the pivot sleeve including a pivot sleeve annular body and a pivot sleeve closed end disposed adjacent the shaft distal end, the pivot sleeve being positioned within the bore of the rotary actuator;
• a ball bearing set disposed between and in mechanical communication with the shaft-body and the pivot sleeve annular body for rotating the pivot sleeve with respect to the pivot shaft;
• and
• a shaft magnet element attached to the shaft distal end adjacent the pivot sleeve closed end, the shaft magnet element being sized and configured to apply a magnetic force to the pivot sleeve in a direction along the central axis for pre-loading the ball bearing set.

A disk drive comprising:

• a disk drive housing;
• and
• a head stack assembly rotatably coupled to the disk drive housing, the head stack assembly including:
• a rotary actuator including a bore;
• a pivot bearing cartridge including:
• a pivot shaft including a central axis, a shaft body and a shaft distal end;
• a pivot sleeve disposed about the pivot shaft, the pivot sleeve including a pivot sleeve annular body and a pivot sleeve closed end disposed adjacent the shaft distal end, the pivot sleeve being positioned within the bore of the rotary actuator;
• a ball bearing set disposed between and in mechanical communication with the shaft body and the pivot sleeve annular body for rotating the pivot sleeve with respect to the pivot shaft;
• and
• a shaft magnet element attached to the shaft distal end adjacent the pivot sleeve closed end, the shaft magnet element being sized and configured to apply a magnetic force to the pivot sleeve in a direction along the central axis for pre-loading the ball bearing set.

A pivot bearing cartridge for use in a head stack assembly coupled a disk drive housing, the pivot bearing cartridge comprising:

• a pivot shaft including a central axis and a shaft body disposed along the central axis;
• a pivot sleeve including a pivot sleeve annular body and a first pivot sleeve end disposable adjacent the disk drive housing;
• a ball bearing set disposed between and in mechanical communication with the shaft body and the pivot sleeve annular body;
• and a
• a pivot sleeve magnet element attached to the first pivot sleeve end, the pivot sleeve magnet element being disposable adjacent the disk drive housing, the pivot sleeve magnet element being sized and configured to apply a magnetic force to the disk drive housing in a direction along the central axis for pre-loading the ball bearing set.

A head stack assembly for use coupled to a disk drive housing, the head stack assembly comprising:

• a rotary actuator including a bore;
• and
• a pivot bearing cartridge including:
• a pivot shaft including a central axis and a shaft body disposed along the central axis;
• a pivot sleeve including a pivot sleeve annular body and a first pivot sleeve end disposable adjacent the disk drive housing;
• a ball bearing set disposed between and in mechanical communication with the shaft body and the pivot sleeve annular body;
• and
• a pivot sleeve magnet element attached to the first pivot sleeve end, the pivot sleeve magnet element being disposable adjacent the disk drive housing, the pivot sleeve magnet element being sized and configured to apply a magnetic force to the disk drive housing in a direction along the central axis for pre-loading the ball bearing set.

A disk drive comprising:

• a disk drive housing;
• and
• a head stack assembly rotatably coupled to the disk drive housing, the head stack assembly including:
• a rotary actuator including a bore;
• and
• a pivot bearing cartridge including:
• a pivot shaft including a central axis and a shaft body disposed along the central axis;
• a pivot sleeve including a pivot sleeve annular body and a first pivot sleeve end disposable adjacent the disk drive housing;
• a ball bearing set disposed between and in mechanical communication with the shaft body and the pivot sleeve annular body;
• and
• a pivot sleeve magnet element attached to the first pivot sleeve end, the pivot sleeve magnet element being disposable adjacent the disk drive housing, the pivot sleeve magnet element being sized and configured to apply a magnetic force to the disk drive housing in a direction along the central axis for pre-loading the ball bearing set.