Browse Prior Art Database

Self-Energized Air-Bearing Spindle in a Disk Drive Motor

IP.com Disclosure Number: IPCOM000062160D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Nishihira, HS: AUTHOR [+2]

Abstract

In a data recording disk file a plurality of disks are supported on and rotated by a central spindle of a drive motor. The spindle is supported during its rotation by an air-bearing along the spindle axis and between the end of the spindle and an end plate, the latter air-bearing providing a thrust bearing for the spindle. The end plate includes a plurality of sectors of negative pressure air-bearing surfaces arranged on the outer perimeter which causes a self-energized air-bearing to be created between the end plate and the end of the spindle during rotation of the spindle. As shown in Fig. 1, the spindle 10 is rotatable within a housing 12 and prevented from contact with housing 12 by an air-bearing in the cylindrical gap 14.

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Self-Energized Air-Bearing Spindle in a Disk Drive Motor

In a data recording disk file a plurality of disks are supported on and rotated by a central spindle of a drive motor. The spindle is supported during its rotation by an air-bearing along the spindle axis and between the end of the spindle and an end plate, the latter air-bearing providing a thrust bearing for the spindle. The end plate includes a plurality of sectors of negative pressure air-bearing surfaces arranged on the outer perimeter which causes a self-energized air-bearing to be created between the end plate and the end of the spindle during rotation of the spindle. As shown in Fig. 1, the spindle 10 is rotatable within a housing 12 and prevented from contact with housing 12 by an air-bearing in the cylindrical gap
14. Similarly, an air-bearing is achieved in the gap 16 between the spindle 10 and the housing end plate 18. The end plate 18 has a central vent 21 connecting the gap 16 to the atmosphere. Located on the inner surface of end plate 18 are a plurality of sectors, such as typical sector 20, as shown in Fig. 2. The leading edge of typical sector 20 relative to the direction of rotation of shaft 10 has a step
22. The remaining portion of sector 20 has a land 24 and a central pocket 26 at the trailing edge. Radial grooves are spaced between the sectors, such as radial grooves 17 and 19 adjacent to typical sector 20. Each sector is thus surrounded by atmospheric pressure. In operation, the rota...