Quantum Corporation

Digital Equipment Corporation

Jackie Cordova

Carl D Williams

Forrest D Titcomb

Richard E Mills

Shuo-Hao Chen

Ewaryst Z Polch

Max W Schaule

A coating system and method for facilitating the cleaning of hydrodynamic bearings and their associated structure is effectuated by applying a surface energy lowering coating to selected portions of the bearing other than the surface tension seal producing gaps thereof prior to a lubricant fluid fill. The coating system and method of the present invention may also advantageously be utilized to produce a secondary barrier seal extending a relatively short distance within and adjoining the opening of the surface tension seal producing gaps.

Coating system and method for filling of a hydrodynamic bearing and a

A method, and associated apparatus, or applying fluid lubricant to hydrodynamic bearing. Clearance spaces of the bearing which are to be filled with the fluid lubricant are evacuated. The fluid lubricant is then applied to the clearance spaces. Once the fluid lubricant has been applied to the clearance spaces, or concurrent therewith, the clearance spaces are returned to ambient pressure levels. Any pockets of air, or other gas, trapped within the bearing are collapsed as the clearance spaces are returned to the ambient pressure levels. The method is amenable to a high volume, assembly line-like process wherein large numbers of bearings may be filled with the fluid lubricant in a short period of time. A conveyor conveys the bearings into a pool of fluid lubricant in a vacuum tank having a pressure level adjustable between an ambient pressure level and an evacuated pressure level, through the pool of fluid lubricant, beyond the pool, and out of the vacuum tank.

Method and apparatus for applying lubricant to a hydrodynamic bearing

A hydrodynamic bearing journaling a shaft includes a rotatable bushing journaling the shaft and thrust plates on the shaft at opposite ends of the bushing. The bushing is encased in a cylindrical sleeve. Lubricant containing clearance spaces are formed between the shaft, bushing, sleeve, and thrust plates. One or more internal helical passages are formed between the bushing and sleeve and open into the axial ends thereof adjacent to the thrust plates. An internal radial chamber between the bushing and sleeve opens into the helical channel through radial ports for providing lubricant between the journal bearing and the shaft and thrust plates.

Shock resistant bearing

An improved hydrodynamic bearing comprising a longitudinally extending sleeve and an elongated shaft with the shaft being disposed within the sleeve for rotation relative thereto. A first thrust plate is coupled to one end of the shaft and a second thrust plate is coupled to the opposite end. A lubricant is disposed between the shaft and the sleeve as well as between the first and second thrust plates and the sleeve. The first thrust plate extends radially outward adjoining a corresponding first end of the sleeve forming a gap for containing the lubricant therebetween and the first thrust plate further extends axially inward toward a center of the bearing along an outer surface of the sleeve defining a surface tension seal forming gap therebetween. In a particular embodiment, the surface tension seal forming gap may be tapered to grow wider as it extends axially inward toward the center of the bearing to form a surface tension seal. The inverted surface tension seal configuration allows for an increased distance between the centers of force acting at the upper and lower bearing journals, thereby resulting in an enhanced tilt stiffness.

Hydrodynamic bearing having inverted surface tension seals

A method, and associated apparatus, of applying fluid lubricant to a hydrodynamic bearing. Clearance spaces of the bearing which are to be filled with the fluid lubricant are evacuated. The fluid lubricant is then applied to the clearance spaces. Once the fluid lubricant has been applied to the clearance spaces, or concurrent therewith, the clearance spaces are returned to ambient pressure levels. Any pockets of air, or other gas, trapped within the bearing are collapsed as the clearance spaces are returned to the ambient pressure levels. The method is amenable to a high volume, assembly line-like process wherein large numbers of bearings may be filled with the fluid lubricant in a short period of time.

A rotatable shaft/thrust plate combination is disposed within a sleeve to form a first clearance space between the shaft and the sleeve and a second clearance space between the thrust plate and the sleeve. The external faces of the thrust plate are exposed to air. The clearance spaces are filled with a liquid lubricant and the sleeve includes pressure equalization ports connecting the first and second clearance spaces. Surface tension dynamic seals are provided between axially extending surfaces of the thrust plate and sleeve. The equalization ports balance the hydrodynamic pressures in the lubricant to prevent the lubricant being pumped through one of the dynamic seals. The resulting bearing provides high precision with low repetitive and nonrepetitive runouts. The bearing provides hydrodynamic support of both radial and axial loads and the bearing seal is relatively insensitive to orientation of the spindle and minimizes the generation of debris and cotaminating particles.

Hydrodynamic bearing

The filling of a rotatable shaft/thrust plate combination is disposed within a sleeve to form a first clearance space between the shaft and the sleeve and a second clearance space between the thrust plate and the sleeve. The external faces of the thrust plate are exposed to air. The clearance spaces are filled with a liquid lubricant and the sleeve includes pressure equalization ports connecting the first and second clearance spaces. Surface tension dynamic seals are provided between axially extending surfaces of the thrust plate and sleeve. The equalization ports balance the hydrodynamic pressures in the lubricant to prevent the lubricant being pumped through one of the dynamic seals. The resulting bearing provides high precision with low repetitive and nonrepetitive runouts. The bearing provides hydrodynamic support of both radial and axial loads and the bearing seal is relatively insensitive to orientation of the spindle and minimizes the generation of debris and contaminating particles.

A rotatable shaft/thrust plate combination is disposed within a sleeve to form a first clearance space between the shaft and the sleeve and a second clearance space between the thrust plate and the sleeve. The external faces of the thrust plate are exposed to air. The clearance spaces are filled with a liquid lubricant and the sleeve includes pressure equalization ports connecting the first and second clearance spaces. Surface tension dynamic seals are provided between axially extending surfaces of the thrust plate and sleeve. The equalization ports balance the hydrodynamic pressures in the lubricant to prevent the lubricant being pumped through one of the dynamic seals. The resulting bearing provides high precision with low repetitive and nonrepetitive runouts. The bearing provides hydrodynamic support of both radial and axial loads and the bearing seal is relatively insensitive to orientation of the spindle and minimizes the generation of debris and contaminating particles.

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Colorado Springs, CO, United States of America

Jackie Cordova