公开(公告)号：SG44376A1

公开(公告)日：1997-12-19

申请号：SG1996000022

申请日：1994-02-28

Applicant: IBM

Inventor： CRAWFORD ROY PATRICK ,  ENGWALL MATS ,  GILLILAND LARRY JOE ,  GONG KARL ,  ROBERT MICHEL PHILIPPE

IPC: F16C32/06 ,  F04D19/04 ,  F16C17/02 ,  F16C33/10 ,  G11B19/20

Abstract: The pump assembly has a cylinder with a fluid bearing inner surface. A second cylinder is positioned coaxially within the first and attached to a base. The second cylinder has fluid bearing inner and outer surfaces. The outer surface has at least one dynamic pressure generating groove. A shaft is positioned coaxially within the second cylinder. It has a fluid bearing outer surface with at least one dynamic pressure generating groove. A clamp attaches the shaft to the first cylinder. The shaft is rotated to form a hydrodynamic fluid bearing between the two cylinders and a second hydrodynamic fluid bearing between the second cylinder and the shaft. An inlet takes in lubricating fluid. A passage in the body of the second cylinder extends from the fluid bearing outer surface of the second cylinder to the base wherein dynamic pressure in the first hydrodynamic fluid bearing pumps the lubricating fluid through the passage.