<p>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.</p>
申请公布号
EP0626684(A2)
申请公布日期
1994.11.30
申请号
EP19940301418
申请日期
1994.02.28
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
CRAWFORD, ROY PATRICK;ENGWALL, MATS;GILLILAND, LARRY JOE;GONG, KARL;ROBERT, MICHEL PHILIPPE