Showing papers on "Fluid bearing published in 1970"

Hydrodynamic Lubrication of Journal Bearings by Pseudo-Plastic Lubricants : Part 2, Experimental Studies

Abstract: Few experimental investigations on the relation between the nonlinearity of lubricants and the performance of bearings have been published. Theoretical analysis of the relation was presented in the first paper, and experimental analysis of this problem is conducted in this paper. The initial viscosity and the coefficient of pseudo-plasticity are given by the investigation of the flow rate of pseudo-plastic fluids obtained by adding polyisobutylene to spindle oils. The coefficient of pseudo-plasticity is a scale to indicate the behavior of this lubricant. Analyzing the experimental results of the performance of bearings using this lubricant, it is found that the film pressure and the load capacity of pseudo-plastic fluids are smaller than those of Newtonian fluids whose viscosity is equal to the initial viscosity. These values become smaller with an increase in nonlinear factor and eccentricity ratio of bearing.

Bearing arrangement with magnetic fluid defining bearing pads

Abstract: A bearing wherein a fluid bearing pad is sealed between two bearing surfaces, such as between an inner race and an outer race. A permanent magnet and permeable pole pieces define a magnetic circuit which circuit provides for the flow of magnetic flux across at least one of the bearing surfaces. A magnetic gap on the bearing surface through which the magnetic flux flows defines a predetermined continuous peripheral pattern. The magnetic flux is concentrated at the gap and a magnetic fluid is captured therein. The other bearing surface engages the magnetic fluid in sealing relationship and the fluid-bearing pad is sealed between the bearing surfaces and within the periphery defined by the magnetic fluid seal.

Rotating pole rings supported in contactless bearings

Abstract: A rotating magnetic machine having two pole rings defining a common air gap, said air gap being arranged on the surface of a rotational body and at the same time defining the bearing gap for supporting the rotor of the machine and having a flowable material in the bearing gap for producing a hydrodynamic bearing film.

Hydrodynamic lubrication bearing

Abstract: A bearing for a journal lubricated by hydrodynamic lubrication has two helical grooves formed ahead of the load zone of the bearing. One groove has a relatively small pitch angle while the other groove is of greater width and has a much greater pitch angle. Such a bearing arrangement is particularly suitable for supporting stub shafts of gears in high-pressure gear-type pumps and motors.

Centrifugally pressurized liquid hydrodynamic bearing

Abstract: In a bearing assembly comprising a block housing a flanged shaft, one of which is rotatable while the other is fixed, a fluid bearing is supplied to all spaces between the moving and fixed surfaces by virtue of centrifugal pressure differential during rotation. The rotatable member is provided with a reservoir for the fluid. During rotation, fluid flows from the reservoir to the space between the block and the outer circumference of the flange and then through a fluid passage in the fixed member to a fluid passage along the central axis of the shaft and the space between the block and the end of the shaft in the block.

Improvements in or relating to Bearings

Abstract: 1,181,063. Bearings. NATIONAL RESEARCH DEVELOPMENT CORP. 27 April, 1967 [4 Feb., 1966], No. 4892/66. Heading F2A. A "U"-shaped fluid bearing comprises an inner flexible wall 9, Fig. 3, an intermediate wall 14, which is spaced from the inner flexible wall 9 to form a plenum-chamber 13; and an outer wall 5, resilient spacing means 21 being provided between the outer wall 5 and the intermediate wall 14. The inner flexible wall 9 is secured to the outer wall 5 by spacers 11. The wall 14 is formed from a strip of rubber material having a cloth backing on its outer side and having pimples 15, Fig. 4, on its inner side. Marginal portions 17 of the rubber strip are provided without the pimples 15 to allow the rubber strip to be adhered to the inner flexible wall 9, the latter having holes 19 drilled therein. The outer wall 5 may be brass foil and the resilient spacing means 21 may be "open-cell" type synthetic plastics material. In use, pressurized fluid is supplied by means of a pipe 23 to the plenum-chamber 13, from where it escapes through the holes 19 in the inner flexible wall 9 and into a clearance provided between the latter and a shaft 1 mounted in the bearing. In an embodiment, a shaft 37 is supported by three circumferentially-spaced bearings 31, 33 and 35.

Performance of Spherical Bearings for Piston Pumps and Motors

Abstract: The load, supply pressure and relative sliding velocity of the spherical bearings for piston pumps and motors vary periodically. In designing such bearings, it is important to understand thoroughly not only the steady performance but also the dynamic performance. With this purpose the performance of the spherical bearings are analyzed theoretically and experimentally in this paper. The relative importance, with respect to the load capacity of such bearings, of hydrostatic lubrication, squeeze film and hydrodynamic lubrication, is examined theoretically, and the hydrodynamic lubrication is shown to be negligible. Considering hydrostatic lubrication and squeeze film, the theory of dynamic responses of a spherical bearing system is derived. The calculated values agree fairly well with the experimental data. As a result of the analysis, it is shown that a fluid film lubrication is impossible in the usual spherical bearings for piston pumps and motors, for the radius of a bearing sphere is small to support the load. Then, the two new types of spherical bearings, one with a pocket and the other with a pocket and a check valve, are considered and it is shown that these bearings are able to maintain a fluid film lubrication in a fairly wide operating range of piston pumps and motors without enlargement of the bearing.

Improvements in Fluid Bearings

Abstract: 1,183,488. Bearings. G. C. DAVIS. 16 June, 1967, No. 27904/67. Heading F2A. A fluid bearing has three or more fluid feed channels opening into a bearing gap defined between two relatively movable bearing members, said feed channels comprising slots defined between respective faces of each of two relatively immovable elements which form part of one of the bearing members; the direction of the slots being inclined so that fluid is introduced into the bearing gap in a direction counter to the direction of rotation of the other bearing member. In an embodiment a bearing comprises a member 3, Fig. 1, a tube 8, a ring 9 and an annular member 10. The elements are located in a bore 2 of a housing 1, a circlip 4 being received in an annular recess 5 formed in the housing 1 and serving to axially limit the movement of the member 3 in one direction. The members 3 and 10 are bored to receive a shaft 7 which has a thrust-ring 22 mounted thereon; a bearing gap 18 being formed between an end-face 21 of the ring 22 and endfaces 19 and 20 of the member 10 and ring 9 respectively. The member 10, Fig. 3, is provided with tangential recesses 25 which direct the flow of fluid to the bearing gap 24. In use pressurized fluid is supplied through a port 27 in the housing 1 to an annular channel 28. the fluid then passes through radial bores 29 in the tube 8 to an annular feed-channel 15. The latter supplies the bearing gap 24 via the recesses 25 and supplies the bearing gap 18 via an annular passage 17 formed between the ring 9 and the member 10.

Fluid bearing structure

Abstract: A fluid bearing construction comprising of a base, a stator and a rotor. The rotor is rotatably mounted in the stator by spaced fluid bearings comprising restrictors between complementary surfaces of the rotor and stator to which fluid under pressure is supplied so that a thin film of fluid flows between the surfaces of the stator and rotor. Means are provided for mounting the stator in the base about angularly spaced axes which intersect the axis of the stator so that the stator is free to move about the angular spaced axes with respect to the base.

Improvements relating to fluid bearings

Abstract: 1,201,124. Work table. FERRANTI Ltd. 6 March, 1969 [9 March, 1968], No. 11632/68. Heading B3B. [Also in Division F2] The work-table of a machine tool, or the probe-bearing gantry of an inspection machine, is supported by a hydrostatic bearing assembly comprising a pressure chamber 13 which is sealed by a member 15 movable to accommodate variations in the internal volume of the chamber, means 16 rigidly coupling the load 10 to the member 15, means 22 1 , 22 11 resiliently coupling the load 10 to the chamber 13, and a source 18 for delivering fluid to the chamber and the bearing surfaces 14, 12 via a fluid resistance. The assembly thus provides a compensating device for maintaining a constant distance between the load 10 and the lower bearing surface 12 despite variations in the load. The movable member may alternatively be a piston, with a cylinder provided by the chamber, and the resilient means may comprise a helical spring.

Development of long life jet engine thrust bearings

Abstract: Analyses, design, and testing of hybrid boost bearing based on fluid film and rolling contact elements

Universal joint employing a fluid bearing

Abstract: A universal joint permitting the relative axial angular deflection of two axially spaced apart members comprising a body of fluid disposed between said first and second members and confined therebetween by a deformable membrane maintained in tension by the fluid. The use of such a seal as the load bearing seal in a movable exhaust nozzle assembly is disclosed.