Minebea Company, Limited

Frank Drautz

Martin Bauer

Andreas Kull

The invention relates to a spindle motor having a fluid dynamic bearing system that comprises a base (), a stationary shaft () connected to the base, a hub () rotatably supported with respect to the shaft and two bearing plates () that are disposed at a mutual spacing about the shaft and connected to the hub. A bushing () is provided that is disposed between the bearing plates and separated from them by a gap () at least partly filled with a bearing fluid. There are two stopper plates () that are fixedly connected to the shaft, each abutting one side of each bearing plate and separated from the bearing plate by a bearing gap () filled with bearing fluid. This results in two independent fluid dynamic bearing systems, each of which is disposed about a bearing plate. The motor is driven by an electromagnetic drive system.

Spindle motor having a fluid dynamic bearing system

The invention relates to a spindle motor having a fluid dynamic bearing system that contains a rotor component taking the form of an integrated hub/bearing bush arrangement which encloses a straight, stationary shaft, which in turn is connected at both its ends to axially aligned bearing components, formed in such a way that they seal the fluid dynamic bearing system formed between the shaft and the rotor component and open at both ends. The open ends of the bearing gap are sealed by capillary seals or pumping seals or a combination of capillary and pumping seal.

Spindle motor having a fluid dynamic bearing system and a stationary shaft

The invention relates to a spindle motor having a fluid dynamic bearing system used particularly for driving the storage disks of hard disk drives, having a baseplate, a stationary bearing bush disposed in an opening in the baseplate, a shaft rotatably supported in an axial bore in the bearing bush by means of the fluid dynamic bearing system, a hub connected to the shaft, and an electromagnetic drive system. In order to increase the stiffness of the motor system, according to the invention the bearing bush is provided with a flange that is fixed in the opening in the baseplate and whose outside diameter is distinctly larger than the outside diameter of the bearing bush. Instead of a flange at the outer diameter of the bearing bush there can be provided a sleeve at the base plate which receives the bearing bush at least partly.

Growing community of inventors

Weissach im Tal, Germany

Frank Drautz