Showing papers on "Fluid bearing published in 1972"

Waviness and Roughness in Hydrodynamic Lubrication

Abstract: An analysis of the effect of waviness on lubrication is presented. This analysis consists of direct solutions of the Reynolds equation for corrugated slider bearings under various conditions. It is...

Behavior of a Bingham Solid in Hydrodynamic Lubrication : Part 1, General Theory

Abstract: The qualitative analyses for the core formation inherent in a Bingham solid have already been given by the previous investigations for hydrodynamic lubrication of a Bingham solid. However, they don't make clear the behavior of the solid exactly, because the analyses for finite bearings are not sufficient.In this paper, a method of the vector analysis based on the flow characteristics of a Bingham solid, is presented for a finite bearing and shear stress and velocity distribution in the film are obtained.Using this method, we deduced the equivalent Reynolds equation of a Bingham solid and also established the general theory on the core formation. Consequently it became clear that the core formation is determined by the shear stress distribution which depends on the pressure gradient, the film thickness and the velocity of the slider surface.

Ferrohydrodynamic low-friction bearing with improved volume compensation and fluid seal

Abstract: A self-contained, full film hydrodynamic bearing is provided having a ferrofluid (colloidal suspension of magnetic particles) with magnetic properties which facilitates retention of the fluid within the bearing where the bearing retains the ferrofluid over a wide temperature range and concomitantly compensates for ferrofluid expansion and contraction.

Fluid bearing track device

Abstract: A combination of a fluid bearing having the capability of lifting large loads off of a smooth surface so that they may be easily moved, with a track device having a transversely ribbed continuous belt, the belt being supported by two rollers. The fluid bearings are so situated on supporting elements within the area of the belt that the pressure from the fluid bearing is directed in a downward direction upon the inner surface of the continuous belt, the belt being free to revolve and thus move the load, once sufficient pressure is applied to lift the load off the inner surface of the belt.

Analysis and experimental verification of dynamic characteristics of oil film thrust bearings

Abstract: With an increasing capacity of large marine engines, the axial vibration of a large ship propeller shaft becomes a new problem. In order to solve this, investigation of the dynamic characteristics of thrust bearings is necessary. The authors theoretically analysed the variation of the oil film thickness and the pressure distribution of hydrodynamic thrust bearings under periodical load and verified the results experimentally. In the theoretical calculation, two different ;methods were used. One of them is a strict method, in which the Reynolds equation is solved at every small time interval (nonlinear solution), and the other is an approximate method, using spring and damping coefficients of the oil film (linear solution). The results are: (1) The linear solution method can be applied up to a considerably large amplitude of load. (2) Phase delay of the oil film thickness against the load is large, which has been verified both analytically and experimentally.

Air, gas or fluid bearings

Abstract: A fluid bearing which comprises first and second mutually facing relatively rotatable members, one of the mutually facing surfaces having formed therein a recess acting as a fluid reservoir to which is supplied pressure fluid via a supply conduit and a series of blind ended, preferably parallel, grooves formed in that one surface and in communication with the recess.

Conveyor system with air in floor

Abstract: An air cushion conveyor system for an assembly line or the like. A track for a plurality of transporters, each supported on air bearings, with air supply ducts for the bearings in the track. Track manufactured in sections for assembly on the site, and incorporating air ducts and transporter drive units.

Fluid bearing having discrete holes formed by vortex restrictors

Abstract: A thin foil of magnetic recording tape is accurately supported on a cushion of air adjacent a fixed-position reference surface. The reference surface includes a plurality of discrete holes through which air issues under pressure to form an air layer which supports the tape. These discrete holes are formed by the outlet openings of vortex restrictors.

High density mobile storage system

Abstract: A high density mobile storage system in which groups of load bearing storage devices such as racks and shelves are provided with selectively energized air bearings which provide a lubricating film of air between a supporting warehouse or like floor and the bearings whereby to reduce the coefficient of friction between the bearings and the floor and permit movement of the storage devices, either singly or in groups from place to place along preferably guided paths with little expenditure of power, either manual or automatic.

Magnetic fluid hydrodynamic bearing

Abstract: A pair of stationary soft iron bearings that support the ends of a soft iron shaft each have an annular cavity contiguous with an annular rim. Each shaft end and cavity define a uniform gap that communicates with a divergent pocket defined between the rim and the shaft. To hydrodynamically support the shaft when rotated, a magnetically susceptible bearing fluid is disposed in each gap-and-pocket set and is retained therein by a magnetic field provided by a permanent magnet applied across the gaps and divergent pockets. A field return path around the shaft communicates with the opposite pole regions of the magnet. A gyroscope is illustrated as a suitable environment in which these hydrodynamic bearings might be used.

Rotary head apparatus with dynamic air bearings having ceramic coatings

Abstract: In apparatus for driving a head drum of a broadcasting video tape recorder comprising an electric motor including a stator and a rotor, a head drum mounted on the rotor, and radial and thrust bearings between the stationary and rotary members of the apparatus, ceramic coatings having a thickness of 10 to 100 microns are applied to the radial and thrust bearing surfaces, the bearings are operated as dynamic air pressure bearings, and a load of less than 0.15 Kg/cm2 is applied on the radial bearing.

Gas bearing reaction wheel

Abstract: An intermediate rotatable member is driven at relatively high speed about a common axis and is concentrically positioned between first and second relatively rotatable members, one of which is bidirectionally driven with respect to the other. Hydrodynamic fluid bearings are carried by the intermediate member on both surfaces thereof and acting on the first and second members, thus even upon cessation of motion, between said first and second members, there is no loss of the hydrodynamic fluid bearings between the first, second and third members.