Pivotable arm assembly with reduced thermal distortion
US5251085A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1991 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Jul 17, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5565
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pivoting armset assembly is disclosed herein that has substantially reduced misregistration due to thermal effects. The armset assembly is useful for an actuator in a magnetic disk drive; the preferred embodiment is an armset assembly in an actuator for reading from, or writing to, one or more magnetic storage disks. The armset assembly, constructed according to the present invention, includes an armset having a smooth bore aligned with the axis of rotation. The assembly further includes a sleeve having a smooth outer perimeter with a size for an interference fit within the smooth bore. An anti-friction material is positioned between the smooth sleeve and the smooth bore. The assembly also includes a bearing disposed within the sleeve, to pivot the arm about its axis. The coefficient of friction between the bore and sleeve is high enough that they rotate together as a unit throughout their operating temperature range, without creating radial clearance between the arm and the sleeve, but low enough to permit slight axial adjustments during thermal expansion in which the bore expands at a different rate than the sleeve. Preferably, the anti-friction material is disposed on the slee…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.