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Hydrodynamic thrust bearing
| Details |
Inventors: Showalter, Merle R.;
Assignee: Anatech, Inc. (Madison, WI)
Primary Examiner: Levy; Stuart S.
Assistant Examiner: Hannon; Thomas R.
Attorney, Agent or Firm: Witherspoon & Hargest
A hydrodynamic thrust bearing adapted for positioning between a fixed base and a moving member spaced from said fixed base, the moving member having a rigid flat face confronting the fixed base, wherein the hydrodynamic thrust bearing includes a thin metal disk having undulations extending radially outward from the center of the disk in a symmetrical manner throughout one entire surface of the metal disk, and a planar face on the other side, the disk is positioned between the fixed base and the rigid flat face of the moving member whereby the undulations of the disk are in contact with the rigid flat face and the planar face is in contact with the fixed base, lubricant is supplied between the disk undulation and the confronting rigid flat face of the moving member whereby thrust movement relative to the disk will produce a very thin film of lubricant between the undulations of the disk and the cooperating rigid flat face of the fixed base. |
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DETAILED DESCRIPTION FIG.
1 shows a plan view of the wavy disk thrust bearing 10.
The view shows schematically four radial waves, A, B, C and D each wave a similar smooth curve, for example a sinusoidal curve, having a peak-to-valley height of 0.
006"-0.
0005" depending on loading conditions.
As such a wavy disk bearing rotates in the presence of oil against a planar surface, each wave acts as a smooth hydrodynamic bearing.
As the surface loading of such a bearing increases, Hertzian deformation of the contacting curved surfaces acts to greatly increase the radius of curvature of the waves against the co-acting plane.
Since hydrodynamic load-bearing capacity of cylinder on flat plate bearings, which these waves in effect are, increases linearly with cylindrical radius of curvature, this deformation is highly favorable to load capacity.
On the scales relevant to hydrodynamic fluid mechanics, these bearings are variable geometry bearings with excellent load-bearing capacity.
Radial grooves, 15, 16, 17, and 18 in the low portions of the wave assist in lubricating the thrust bearing.
FIG.
2 is an elevational view of one half of the perimeter of the bearing disk.
It is shown flattened out so the undulation or waves on the bearing are shown clearly as they exist on both sides of the thrust bearing disk 10.
As depicted in FIG.
2, the distance from the low to the peak of an undulation is approximately 0.
002" while the disk is about 0.
500" in thickness "T".
The disk faces are each provided with several radial grooves such as 15-18, as seen in FIG.
1, to provide lubrication to the interface between the undulating disk surface and the rigid flat surface of a base bearing.
The radial grooves are provided with lubricant from any convenience source and therefore such has not been shown in FIG.
2.
It is believed that the wavy disk thrust bearing can be manufactured quite inexpensively, and it is envisioned that wavy disk thrust bearings can best be made by stamping out of flat metal disks.
FIG.
3 shows a disk thrust bearing 2, supporting thrust on rotating shaft 4, having planar thrust section 6, and acting against block 7 having a rigid planar surface 8
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Metal Working 
