Patent · US Expired

Spindle motor having a hydrodynamic bearing system

US7345392B2 · kind B2 · utility

10Cited by

14References

17Claims

0Family size

Assignee

Minebea Co., Ltd. · JP

Inventors

Martin Hafen · Colmar, FR
Joerg Hoffmann · Mettlach, DE
Andreas Kull · Hüfingen, DE
Tobias Kirchmeier · St. Georgen, DE
Rudolf Neumann · Spaichingen, DE
Thilo Rehm · Villingen-Schwenningen, DE
Olaf Winterhalter · Epfendorf, DE

Key dates

Filing date	Mar 29, 2005
Grant date	Mar 18, 2008
Priority date	—
Expiry date	Aug 20, 2025

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16C2370/12
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to a spindle motor having a hydrodynamic bearing system, particularly to drive platters in a hard disk drive, the platters being disposed on a rotor, and the bearing system being formed by a bearing sleeve arranged on a baseplate and a shaft rotatably supported in an opening in the bearing sleeve and at least one thrust plate connected to the shaft. A liquid lubricant is filled into a bearing gap formed between the shaft, the thrust plate and the bearing sleeve. The invention is characterized in that the thrust plate rests directly against the rotor and is accommodated in an annular recess in the bearing sleeve facing the rotor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.