公开(公告)号：US20170102031A1

公开(公告)日：2017-04-13

申请号：US15119246

申请日：2015-05-27

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： WILLEM POTZE ,  ANAND KUMAR DOKANIA ,  GEREON VOGTMEIER ,  PETER KLAUS BACHMANN ,  CHRISTIAN HERBERT BLOME ,  MICHAEL LUEBCKE

IPC: F16C33/10 ,  F16C17/10 ,  G11B19/20 ,  A61B6/03 ,  H01J35/10 ,  G11B33/14 ,  F16C17/02 ,  F16C43/02

CPC classification number: F16C33/106 ,  A61B6/032 ,  F16C17/026 ,  F16C17/105 ,  F16C17/107 ,  F16C33/107 ,  F16C33/24 ,  F16C43/02 ,  F16C2202/54 ,  F16C2316/10 ,  F16C2370/12 ,  G11B19/2036 ,  G11B19/2045 ,  G11B33/148 ,  H01J35/101

Abstract: Hydrodynamic bearings exploit the properties of pumping action in a fluid to support a bearing load. Conventionally, the pumping action is provided by grooved surfaces in a bearing surface of the bearing. The provision of grooves leads to functional and practical problems, though. The action of grooves on a lubrication material leads inevitably to shear stress being exerted in the fluid. This has a detrimental effect on the load performance of a hydrodynamic bearing. In practical terms, the accurate manufacture of grooves is onerous. This application discusses a way of producing a hydrodynamic bearing using a portion of a bearing surface with an interleaved pattern of materials, wherein the materials have alternate high and low (or zero) fluid slip characteristics. The varying fluid slip characteristic of the surface induces a pumping effect analogous to that provided by a grooved surface.

公开(公告)号：US20170097049A1

公开(公告)日：2017-04-06

申请号：US15312340

申请日：2015-04-01

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： PETER KLAUS BACHMAAN ,  ANAND KUMAR DOKANIA ,  WILHELMUS CORNELIS KEUR ,  GEREON VOGTMEIER ,  WILLEM POTZE ,  CHRISTIAN HERBERT BLOME

IPC: F16C39/02 ,  F16C17/10 ,  F16C17/04 ,  H01J35/10 ,  F16C43/02 ,  G01N23/04 ,  H01J35/06 ,  F16C17/02 ,  F16C33/12

CPC classification number: F16C39/02 ,  F16C17/026 ,  F16C17/045 ,  F16C17/107 ,  F16C33/109 ,  F16C33/124 ,  F16C33/125 ,  F16C43/02 ,  F16C2202/54 ,  F16C2206/04 ,  F16C2206/58 ,  F16C2206/80 ,  F16C2206/82 ,  F16C2223/30 ,  F16C2240/06 ,  G01N23/04 ,  H01J35/06 ,  H01J35/101

Abstract: The present invention relates to hydrodynamic bearings, X-ray tubes, X-ray systems, and a method of manufacturing a hydrodynamic bearing for an X-ray tube. The rotor of a hydrodynamic bearing is supported, in steady-state operation, by the pressure of lubricant which is pumped through grooves in the rotor. When the rotor is speeding up or slowing down, the pumping force will not be sufficient to lift the rotor clear of a stationary bushing, and damage, caused by direct contact of the metal surfaces of the bearing, can occur. Providing special coatings on the bearing surfaces can ameliorate this effect.