Abstract: A centralizing bushing associated with a shaft for reducing noise and fluctuations between the bushing and the shaft when they are moving relative to each other. The bushing is mounted in the rider and includes a bearing engagable with the shaft. There are high friction, elastomeric means engagable with the bearing for limiting movement of the bearing away from the shaft and the rider is under unbalanced radial load conditions. The coefficient of thermal expansion of the bearing is essentially the same as the coefficient of thermal expansion of the shaft. The bearing is made of a thermoplastic resin mixed with carbon fiber and having a coefficient of thermal expansion which is essentially the same as that of the shaft such that the shaft and bearing will expand and contract essentially at the same rate in response to the temperature changes.

Abstract: A bearing assembly comprises a piston mounted within and capable of reciprocating movement with respect of a fixed bearing shell. The bearing shell is provided with openings for the supply of a bearing medium, such as compressed air, into a clearance between the piston and the bearing shell. The bearing shell is resilient so that as the diameter of the piston increases due to thermal expansion, the diameter of the bearing shell changes to automatically maintain the clearance therebetween.

Abstract: A combination of a fixed and moving surface, which may in a common example comprise a rotating journal facing a thrust plate, characterized in that both parts are made of materials or material combinations chosen such that, as the temperature rises, the gap between the bearing surfaces becomes smaller due to the different thermal expansion of the relevant parts.The high coefficient expansion material includes a relatively shallow recess near the center of the bearing. This recess allows the expansion material to expand with temperature in order to decrease the gap and maintain the stiffness of the bearing. As the temperature rises, the fluid is forced out of the recess region and into the effective bearing gap thereby maintaining the overall stiffness of the bearing, which would otherwise fall as fluid viscosity drops.

Abstract: An arrangement for concentrically positioning a first part relative to a second part, for example, a casing, or sleeve, (2) relative to a shaft (1), when the parts are made from materials with different coefficients of thermal expansion, provides a radial clearance (4) between the first and second parts. The first part (2) is supported along its length by portions facing radially away from the second part, at an abutment arrangement (7, 8) having the same or similar thermal expansion characteristics as the first part (2). The abutment arrangement (7, 8) is held concentric relative to the second part (1).

Abstract: Strips of polytetrafluoroethylene (i.e., Teflon) are interposed, equally spaced apart, between the journal and sleeve, and journal and collar of a bearing assembly to provide lubrication thereat. The Teflon strips are fibrous and porous, and compressibly collapsible therefor, to insure that thermal expansion of any one thereof will not unduly load the bearing assembly. The bearing material has surface voids in which to trap and retain the Teflon which is wiped onto the contact surfaces.

Abstract: A preloaded assembly (100) in accordance with the invention includes a stationary bushing (14) having an annulus (18); a shaft (12) having a first thermal coefficient of expansion with the shaft being mounted for rotation in the annulus of the stationary bushing; a first sleeve (102) which contacts the first shaft along a first portion (106) of an outside surface (104) of the shaft with the first sleeve having a second thermal coefficient of expansion; a second sleeve (108) having a third thermal coefficient of expansion, an outer surface (22) facing the annulus of the stationary bushing and an annulus with a first axial section (114) of the annulus of the second sleeve contacting a second portion (112) of the outside surface of the shaft adjacent the first portion and a second axial section (116) of the annulus of the second sleeve contacting an outside surface (118) of the first sleeve; and wherein the second coefficient of thermal expansion is greater than the third thermal coefficient of expansion and the

Abstract: A bearing assembly includes a bearing characterized by a gradated composition such that the bearing transitions from a metallic substrate such as high strength steel to an inner layer of silver, ceramics, or diamond-like material wherein the thermal coefficient of expansion as between the bearing and a rolling element or shaft is matched.

Abstract: An assembly in which a rotating shaft is supported by a magnetic bearing has a back-up bearing to support the shaft in the event of failure of the magnetic bearing, the back-up bearing comprising a first layer of a dry bearing material, and with a surface opposite to a wear-resistant surface portion of a second layer. One layer is provided on a stationary part of the assembly, such as a housing, and the other layer is provided on the shaft. When the coefficient of friction between the first and second layers is either relatively low, or relatively high, heat can be dissipated from the back-up bearing at a low rate; or at a high rate. Heat dissipation may be enhanced by providing fins in good thermal contact with at least one of the two layers of the back-up bearing; and each such layer, advantageously, has a high thermal conductivity.

Abstract: A temperature compensated shaft bearing support assembly in a magnesium alloy housing wall includes a liner made of a material which has a coefficient of thermal expansion between the coefficients of thermal expansion for the magnesium alloy and for the steel bearing. A support spigot has two hubs, one for supporting the shaft bearing and the other for supporting the liner that in turn is supported by the housing wall.

Abstract: A sliding bearing such as a half sliding bearing, a cylindrical bushing and etc. includes a back metal of a three-layer construction composed of a back metal portion of austenitic stainless steel having a thermal expansion coefficient of not less than 15.times.10.sup.-6 /.degree.C., a plated bonding layer formed on the back metal portion, and a plating layer of Cu or a Cu alloy formed on the bonding layer. An alloy layer made of a copper-lead alloy or a lead-bronze alloy is formed on the back metal. With this construction, the alloy layer is positively bonded to the back metal. The austenitic stainless steel is of such a type that the back metal is less subjected to work hardening, and the austenitic stainless steel contains those components which prevent work-inducing martensite transformation.

Abstract: A feed-screw support structure is adapted to absorb thermal expansion of a feed screw in a machine tool. It comprises a main-body member, a bearing-holder at the one end of the feed screw slidably arranged in the main-body member, a clamping member provided between the bearing-holder member and the main-body member and adapted to fix these members, and a device for operating the clamping member in accordance with factors and matters related to heat generation in the feed-screw. The bearing-holder member being normally held in a stationary condition by the clamping member, the feed screw being allowed to relieve thermal expansion by temporarily releasing the stationary condition when heat generation in the feed screw takes place to a relatively large degree.

Abstract: To provide a snug-fitting bearing for journalling the spindle end of a printing press cylinder, a flanged bearing sleeve is disposed in a bore in the press frame and an anti-friction plastic material which compensates for the bearing play is injected into an external annular groove in the bearing sleeve of considerably less width than the depth of the bore in the press frame. Preferably, the bore is pretreated with a volatile release agent and the plastic material cures in situ to become a narrow bearing ring in the groove. The bearing sleeve may have eccentric annular shoulders on either side of the groove and a thin annular metal bushing may be interposed between the cylinder spindle and the interior of the sleeve bearing.

Abstract: An adapter element that allows machine elements to be accommodated in a centered manner with zero play, with these machine elements having different thermal expansions over broad temperature ranges. The adapter element has a sleeve-like portion that has tongue-like regions defined therefrom. Flattened or planar regions are provided on the inner and/or outer surface of the sleeve-like portion, with these planar regions at least partially overlapping the tongue-like regions.

Abstract: A bearing assembly comprised of a split-ring annular bearing member having overlapping free ends and being molded of self-lubricating plastic material having a pressure velocity value at least equal to 1800 at 100 feet per minute surface speed and an annular continuous elastomeric combined sealing member and spring mounted in supporting relation to the split-ring bearing member and formed of a flowable rubber-like material, the combined sealing and spring member being mounted within a groove behind the bearing member so as to continually apply light pressure thereto to urge the same against the bearing surface so as to maintain a seal thereat; the combined sealing and spring member being of right-angled polyganol cross-sectional configuration and have concaved sides and convex corner lobes and being more narrow than the groove and sufficiently forgiving to avoid undue pressure and consequent wear upon the bearing member over the full range of temperature variations, created by high speed relative movement bet

Abstract: A plain-bearing housing has a two-part housing of which at least the lower part is provided with cooling ribs in horizontal rows whose ribs are mutually staggered. Distinct rib registers can also be provided on the upper housing part. The result is an improved dissipation of heat from a plain bearing of a shaft journaled in this housing.

Abstract: An improved heat sink and bearing support arrangement for an armature shaft of an electric motor in an electrically actuated device which comprises a thin walled body fabricated by sheet metal processes. In a preferred embodiment, the support body has a generally mushroom shaped configuration which includes integrally formed central, shoulder and collar segments. A bearing body is supported by the central segment and the collar segment engages a housing for supporting the assembly in the device.

Abstract: A pneumatic journal bearing suitable for application to a rotating shaft which will acquire high temperature during operation, such as the turbine shaft in an automotive turbocharger. In this journal bearing, the cylindrical hole of the bearing body has a diameter considerably larger than the diameter of the shaft rotating therein. A hollow cylindrical journal member having an inner diameter substantially larger than the diameter of the shaft is coaxially disposed in the bearing hole and coaxially fixed to the shaft at two end plates of the cylindrical journal member, and compressed air is introduced into a clearance space between the journal member and the cylindrical bearing surface. Since the cylindrical major portion of the journal member is spaced from the shaft, the journal member does not undergo such significant thermal expansion as results in significant narrowing of the clearance space even though the shaft acquires high temperature.

Abstract: The rotary compressor according to the present invention is constructed such that a rotary sleeve is rotatably and floatingly, suspended within a central housing by means of a pneumatic bearing chamber. A rotor, into and out of which a vane can freely move, is rotatably housed within said rotary sleeve. On the periphery of said rotary sleeve a taper is formed continuously extending from both ends toward the axial center. Such a construction ensures inhibition of frictional heat generation in the vane and non-lubricated rotation.

Abstract: A bearing construction for a crankshaft of a cold Pilger rolling mill for the rolling of tubes wherein the connecting rod is attached to the mill and in which case friction is created between an abrasion bushing made from surface-hardened steel and a bearing box made of high-load or strength synthetic material. For the lubrication of the friction surfaces, the cooling fluid employed for rolling is used. For better removal of heat, the abrasion bushings are provided with means such as cooling fins or similar surface-enlarging profiles and/or materials with high thermal conductivity.

Abstract: For use in a pressure fed or flood lubricated bearing, there is disclosed a shaft load-bearing element (e.g., the thrust plate in a tapered land thrust bearing) preferably comprising three metallic layers including an inner layer adjacent the shaft surface of metal possessing good bearing properties; an outer layer of structural steel to provide rigidity; and an intermediate layer of copper or copper alloy sandwiched between the inner and outer layers to provide good thermal properties. The metallic layers of such a trimetallic bearing element are metallurgically bonded at the interfaces between layers to enhance heat transfer. Advantageously, a shaft load-bearing element according to the invention is substantially free from distortion and damage during handling and avoids elevated temperature problems.

Abstract: Bearing assembly intended for operation in a given temperature range has a radially outer bearing member 16 made of steel and supported in a housing 20 made of a material, e.g. magnesium whose coefficient of thermal expansion is substantially higher than steel. The member 16 has radially inwardly facing surface 17 adapted to engage a radially outwardly facing surface 22 of the housing. In use, when the temperature of the assembly rises the surface 22 of the housing moves toward the surface 17 of the member 16 so that engagement between the surfaces 17,22 is enhanced or an initial gap 23 between the surfaces 17,22 is closed.

Abstract: In a multishaft supporting device comprising a barrel and sleeve adapted to receive a plurality of shafts of a kneader, a twin shaft extruder or the like, inserts made of a metal having larger thermal expansion coefficient than the barrel and sleeve are inserted between the barrel and the sleeve to improve heat transfer therebetween.

Abstract: An article comprising a component of ceramic material and a metal component has a metal felt located between opposed faces of the two components, the metal felt being permanently joined to both the ceramic face and the metal face to join the two components together. The metal felt may be brazed to both components, the brazing alloy being one which chemically combines with the ceramic material. The brazing alloy may be in the form of a foil placed between the metal felt and each of the components, and the brazing may take place in a vacuum.