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Beam mounted bearing pad and methods of making same
| Details |
Inventors: Ide, Russell D.;
Assignee:
Primary Examiner: Footland; Lenard A.
Assistant Examiner:
Attorney, Agent or Firm: Marks & Murase
A hydrodynamic bearing and methods of manufacturing the same. The bearing includes a bearing pad structure that may change shape and move in any direction (six degrees of freedom) to form a converging wedge for hydrodynamic operation, and to adjust for any shaft misalignment. The pad is separated from the support member by one or more beam-like members the beams extend substantially parallel to the plane of the face of the pad. The beams allow deflection of the pad by either deflecting or twisting in a torsional mode. The bearings may be made of a wide variety of materials including, plastics, ceramics, powdered metals, composites and metals. The bearings may be manufactured by injection molding, casting, powdered metal die casting, extrusion, electric discharge or laser cutting. |
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DETAILED DESCRIPTION The present invention discloses a pad type bearing and methods of making the same.
The pad type bearing consists of a, preferably unitary, cylindrical journal that has been machined or formed with small grooves and slits or cuts through or on the journal wall to define a flexible pad and a support structure capable of supporting the pad for movement in the six degrees of freedom (i.
e.
, movement in the tx, -x, +y, -y, +z and -z directions.
) The support structure is preferably unitary and comprises support stubs, beams, and/or membranes connected to a housing which is defined by the radially outermost portion of the bearing.
The inventor has discovered that in many specific applications such as in high speed applications, it is necessary to examine and evaluate the dynamic flexibility of the entire system consisting of the shaft or rotor, the hydrodynamic lubricating film and the bearing.
In computer analysis of this system using a finite element model, it has been determined that it is necessary to treat the entire bearing as a completely flexible member that changes shape under operating loads.
By adding more or less flexibility via machining of the basic structure, bearing characteristics may be achieved that provide stable low friction operation over wide operating ranges.
A number of variables have been found to substantially affect the bearing's performance characteristics.
Among the most important variables are the shape, size, location and material characteristics (e.
g.
modulus of elasticity etc.
) of the pad and support members defined by the slits or cuts and grooves formed in the bearing.
The shape of the support members has been found to be particularly important.
Also by providing a fluid backing to the flexible members, a high degree of damping may be achieved that further adds to system stability.
In some instances, this damping has replaced secondary squeeze film dampening that is present when the oil film is present between the casing of the bearing and the housing
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