Patent Number: 7,133,250

Title: Inboard thrust surface fluid recirculation pump

Abstract: An inboard thrust surface is provided for a spindle motor that maintains fluid flow through a journal bearing and generates an added offset pressure to avoid any subambient pressure within a journal. In an aspect, journal bearing asymmetry is minimized or eliminated and axial span is increased between journal bearings, reducing wobble or run-out between relatively rotating components. In another aspect, journal axial length is decreased for low profile disc drive memory systems and other spindle motors. In an aspect, two separate thrust surfaces provide an axial force in the same direction, opposing an axial bias force created by interaction of a stator and a magnet, and minimizing power consumption.

Inventors: Herndon; Troy M. (San Jose, CA), Woldemar; Christopher M. (Santa Cruz, CA), Parsoneault; Norbert S. (Scotts Valley, CA)

Assignee: Seagate Technology LLC

International Classification: G11B 17/02 (20060101); F16C 32/06 (20060101)

Expiration Date: 2019-11-07 0:00:00