Magnetic disk memory comprising a membrane spring-braced bearing of a disk pack which is rotatably mounted at both ends

US4739425A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Albert Dierkes · Planegg, DE
• Johann Biermeier · Munich, DE
• Wilhelm Brand · Hannover, DE
• Otto Olbrich

Key dates

• Filing date: Jan 29, 1985
• Grant date: Apr 19, 1988
• Expiry date: Jan 29, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B33/14
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A magnetic disk memory comprises a hub rotatably seated at both ends in a one-piece supporting shell of a housing and carrying at least one storage disk and driven by an internal drive motor. The hub is fixed on a rotating spindle, whereby a pair of ball bearings is provided for seating the spindle at mutually opposite walls of the supporting shell. The ball bearings are embraced in the axial direction in order to achieve a play-free spindle guidance. Each ball bearing has an inner ring fixed with an interference fit onto a respective end of the spindle and a respective bearing bushing likewise seated with an interference fit on its outer ring. One of the two bearing bushings is rigidly disposed in the allocated wall of the supporting shell and, in the incorporated condition of the hub, the other bearing bushing is fixed at the opposite wall of the supporting shell and is prestressed in the axial direction.