Fluid dynamic bearing

US8322927B2 · kind B2 · utility

Assignee

• Minebea Co., Ltd. · JP

Inventors

• Olaf Winterhalter · Epfendorf, DE
• Andreas Kull · Hüfingen, DE

Key dates

• Filing date: Apr 22, 2009
• Grant date: Dec 4, 2012
• Expiry date: Jan 8, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C33/745
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A fluid dynamic bearing having at least one first bearing part as well as a second bearing part that are rotatably supported with respect to one another about a rotational axis and separated from one another by a bearing gap filled with bearing fluid. Associated bearing surfaces of the bearing parts form a first and a second radial bearing that are marked by grooved bearing patterns disposed on at least one bearing surface. Between the radial bearings, there is a separator gap having an enlarged gap distance compared to the bearing gap. The ends of the grooved bearing patterns of the radial bearings adjoining the separator gap penetrate into the separator gap. This measure prevents the creation of negative pressure at the ends of the grooved bearing patterns, as a result of which the formation of air bubbles is also reduced.