Abstract: A spindle structure for a machine tool such as a boring machine, for example, includes a rotatable tubular shaft to be coupled to a rotative drive source, and a spindle axially slidably disposed in the tubular shaft and rotatable in unison with the tubular shaft. Bushings with powder on WC-base cemented carbide thermally sprayed on inner peripheral surfaces thereof are disposed between the tubular shaft and the spindle to prevent fretting corrosion. The WC-base cemented carbide comprises 12.about.18 wt % of Co, 4.about.6 wt % of C, 0.1.about.1.2 wt % of Fe, and 75.about.84 wt % of W.

Abstract: In a combination of sliding members which are suitable for use in the compressor for an automotive air conditioner, one of the members consists of an aluminum alloy which contains silicone particles consisting solely of eutectic silicon; and the other sliding member consists of a fluoride resin which contains carbon fibers and a calcium compound. The surface of the aluminum alloy can be finished to a desired smoothness as it does not contain any excessively hard substance. Also, since a calcium compound which is intermediate between carbon fibers and teflon resin in hardness is distributed in the teflon resin, the tendency of the carbon fibers to attack the aluminum alloy is reduced, and the aluminum alloy can achieve a sufficient wear resistance even though it does not contain any primary crystal silicon particles having a high hardness. Furthermore, the calcium compound serves as a lubricant, and reduces friction between the two sliding members.

Abstract: An operating apparatus includes a ball screw apparatus having a nut secured to a table which is fixed on sliders of a linear guide apparatus. The nut is engaged with a screw shaft and, when the screw shaft is rotated by a driving motor, the table having a member to be driven fixedly mounted thereon is moved together with the nut linearly and horizontally along the screw shaft. The ball screw apparatus and the linear guide apparatus is placed on a clean room, and a dust suction pump located outside the clean room sucks the dust produced in the clean room. Furthermore, a suction pipe of the dust suction pump is connected to a feed oil bore of the nut, which bore has been formed normally beforehand as a feed oil nipple. Thus, the dust produced in the inside of the nut is also sucked out by the dust suction pump. The suction pipe has a spiral portion near the nut.

Abstract: The reliability of silicon nitride bodies for use in bearings can be greatly improved by control of microstructural flaws which produce bright specular reflections when metallographically prepared surfaces of the composites are examined microscopically in low angle incident light, dark field reflected light, or reflected polarized light viewed through a crossed polarizing analyzer. The population of such flaws can be controlled by modestly increasing the normal amount of intergranular phase and longer than normal milling times before sintering. Size classification of the powder before compression also improves the performance of the body.The fatigue cycles to failure of ten percent of the silicon nitride surfaces tested at 6.9 GPa contact stress in accelerated bearing failure ASTM Test STP 771 (L.sub.

Abstract: A rolling bearing having an inner ring, outer ring and rolling element, at least one of these elements being made of one of the following first, second or third medium-carbon manganese steels. The first medium-carbon manganese steel includes C: 0.4 to 0.7 wt. %, Si: 0.15 to 1.2 wt. %, Mn: 1.2 to 1.7 wt. %, Al: 200 to 300 ppm, Ti: up to 40 ppm, N: 100 to 200 ppm, S: up to 80 ppm, O: 9 ppm and the balance of Fe. The second steel includes at least one of Nb: 0.03 to 0.08 wt. % and V: 0.1 to 0.15 wt. % in addition to the elements of the first medium-carbon manganese steel. The third medium-carbon manganese steel includes at least one of Nb: 0.03 to 0.08 wt. % and V: 0.1 to 0.15 wt. % instead of Al and N and includes the other elements of the first medium-carbon manganese steel. Each medium-carbon manganese steel is subject to carburizing or carbo-nitriding so as to include a case with a 25 to 45 vol. % retained austenite.

Abstract: A ceramic shaft machinery element having an incorporated cooled bearing runner surface providing superior support for the ceramic shaft.

Abstract: Journal bearings comprising two half bearings are described. Only one half bearing, in the highest loaded position, has an overlay coating. Preferably the non-overlay coated half comprises a silicon containing aluminum alloy which exerts a polishing action on the shaft journal thus decreasing the degree of abrasiveness of the journal. The non-overlay coated half may also be profiled to allow accelerated polishing of the shaft journal.

Abstract: A combination of a sliding-contact race (12) and bearing (10) in which a generally ring-shaped race member (12) and a generally ring-shaped bearing member (10) are fitted for relative sliding-rotation, the bearing member being within the race member. One of the members is comprised substantially of copper and the other of the members is comprised substantially of titanium. The members (10, 12) have lubricated contact surfaces (16, 18) for sliding-rotation, the member being comprised substantially of titanium having its lubricated contact surface being coated with chromium oxide (16).

Abstract: A composite sliding surface bearing consisting of a backing layer of steel, a bearing alloy layer which consists of aluminum and has been applied to said backing layer, and a sliding surface layer which consists of zinc phosphate and has been deposited on said bearing alloy layer. The backing layer of steel is provided on its outside surface in a thickness between 0.5 and 5 .mu.m with a metallic protective layer in order to ensure a firm retention in the bearing housing.

Abstract: A pump including an impeller having a magnet or a second conductor therein, the impeller being adapted to be directly rotated by virtue of magnetic fields of stator coils. The impeller is rotated within a casing in close proximity thereto via ceramic bearing members, one bearing member having spiral grooves on its slide surface. The ceramic bearing members constitute a dynamic pressure bearing means.

Abstract: A ball thrust antifriction bearing for operation at very high speed in the DN number range from 5.times.10.sup.5 to 2.times.10.sup.6 and higher while only marginally lubricated by a mist of liquid having comparatively poor lubricating qualities which is carried in a transporting air stream.

Abstract: A solid lubricant bearing comprises plural rollers disposed in a line or in a circle, plural solid lubricant elements at least one thereof contacting one of the rollers beings pressed by springs on the rollers, and a guiding base for receiving the rollers to roll thereon has a solid lubricant film formed on its roller receiving face.

Abstract: Apparatus such as a nuclear fuel sub-assembly for use in a liquid alkali metal environment has bearing surfaces (4) coated with alumina or aluminide particles to reduce wear, fretting and friction. The particles are deposited by plasma or detonation gun using a nickel chromium alloy as a metallic bond.

Abstract: A multi-layer cylindrical bearing comprises an outer, backing layer (1a) of stainless steel, an intermediate layer (1b) of porous copper alloy formed by sintering copper alloy, and an inner, bearing layer (1c) of synthetic resin formed by impregnating and curing the resin over said intermediate layer.

Abstract: The invention relates to a journal gas bearing body which is formed with a cylindrical bore to rotatably support therein the journal part of a shaft and gas introducing holes radially opening into the cylindrical bore. The bearing body is made of a metal, and only in opposite endmost sections of the cylindrical bore the cylindrical inner surface defining the bore is provided by a very hard and wear resistant material, which is either a ceramic or a cemented carbide. It is convenient to provide the hard inner surface in each of said endmost sections by insertion of a hollow cylindrical bushing formed of a ceramic or a cemented carbide. The gas introducing holes are all located lengthwise inward of said endmost sections to avoid boring through the ceramic or cemented carbide layer. Accordingly the bearing body can easily be manufactured without significant increase in the working cost.

Abstract: A gas bearing and bearing surfaces capable of operating in an unlubricated configuration and providing reliable wear-resistant, start/stop cycling. The bearing typically comprises opposed surfaces of the same or different materials. A first surface is typically formed by ion implantation of boron into a beryllium metal bearing structure. The boron is typically implanted at a predetermined depth into the beryllium surface to provide a substantially pure beryllium surface. The second surface is typically PYROCERAM, a ceramic metal composite, such as a titanium diboride beryllium structure or a surface having titanium diboride and beryllium applied to a beryllium metal bearing structure by hot isostatic pressing facing. The second surface is adapted to run against the first, or against itself in the ceramic or ceramic surface case. The bearing configuration is capable of running reliably and with acceptably low wear through many start/stop cycles without the application of any lubricant.

Abstract: A shoe incorporated into a swash plate type compressor as a drive force transmitting element intervened between a rotatable swash plate and a reciprocal piston has a first member made of a seizure-resistant material such as ceramic and hard metal, and has a flattened contact face in slidable contact with the swash plate, and a second member made of less seizure-resistant material but easily machined and having a spherical bearing face slidably engaged with the piston, the first and second members being joined together to form a unitary element.

Abstract: A composite bearing material for use in the manufacture of crankshaft bearings comprises a steel strip, which is provided on one side, which is to be used disposed on the outside of the bearing, with an elastic layer, and on the other side, which is to be disposed on the inside of the bearing, with a bearing metal layer. In order to effect a sound insulation, in a particularly desirable manner the elastic layer consists of halogen-free polymers.

Abstract: A bearing, such as a plain spherical self-aligning bearing, has a reinforced low-friction woven plastics element (for example comprising ptfe) which is in sliding contact with a very hard, very smooth counterface. The bearing exhibits reduced wear when subjected to low-stress, small-amplitude motions.

Abstract: A process for constructing machine tools. The process includes constructing a form, pouring concrete into the form, allowing the concrete to set, and grinding the sliding surfaces to be properly aligned and precision surfaces. Also disclosed are machine tools made by the process, and a method of assembling such machine tools.

Abstract: This invention relates to the use of spinodal alloys consisting essentially of copper-nickel-tin for bearing surfaces formed between roller cutter cones of sealed bearing rock bits.