Abstract: A fabricated camshaft having individual lobes mounted on tubular collars that are in turn mounted on an internal tubular member that is expanded between the collars to form bearing journals for the camshaft.

Abstract: A wear resistant sintered alloy consisting essentially of from 2.0% to 3.5% by weight of C, from 0.3% to 0.8% by weight of P, from 0.5% to 3.0% by weight of Mn and remainder Fe. The alloy is sintered in the liquid-phase.

Abstract: A tool for supporting a composite camshaft having a steel shaft and a sintered piece to be joined to the steel shaft through sintering in a sintering furnace. The tool comprises a graphite frame having at least two sides, in an upper portion of which a groove means is formed. A ceramic layer is provided on a surface of the groove means. When sintering is performed using such a tool, the tool will not deform even if the tool is exposed to an environment of high temperature, such as the temperature higher than 1,100.degree. C., and therefore, bending of the composite camshaft will not occur during sintering. In addition, the ceramic layer prevents diffusion of carbon from the graphite frame to the steel shaft of the composite camshaft, and therefore, a hardening of the steel shaft due to carbonizing will not occur. As a result, reliability of the joint between the sintered piece and the steel shaft is increased.

Abstract: A rotor for a rotary compressor having a metal central portion integral with two opposite end portions that are fiber-reinforced metal matrix composites having a matrix metal common to the central portion. Such rotors may be made by pressing inorganic fibers to form the end portions of the rotor, arranging the end portions in an opposing relationship in a mold to form the central portion between the end portions. Molten metal is placed into the mold such that it infiltrates the porous end portions while forming the central portion. Solidification of the metal forms fiber-reinforced metal-matrix composite end portions integral with the central portion.

Abstract: A shaft-end constituent member (14) of a material which is different from that of a shaft (12) is firmly attached to one end of the shaft (12). The shaft-end constituent member (14) is provided with an axial projection (15) corresponding to a recess (13) formed in the outer peripheral surface of the shaft (12), and a joint bore (16) is formed in the projection (15) to receive a joint member (17). The joint member (17) enables the retention of a component (20) such as a pulley or the like, so that the component (20) does not rotate about the shaft (12).

Abstract: An apparatus provided in a rotary compressor comprising an air-bearing room (40) defined between the inner periphery of the center housing (22) and the outer periphery of the rotary sleeve (30) to have an air-bearing effect for floatingly supporting the rotary sleeve rotating with a plurality of vanes. The air-bearing room (40) is supplied with air through an inlet passage (45) and/or a connecting passage (49), if necessary. A buffer chamber (47, 57) is formed in the wall of the center housing (22) and opened to the inner periphery of the center housing (22) through tiny bores (48, 58). The rotary sleeve (30) is pushed back to the center by a buffering action of air in the buffer chamber whenever it is put aside toward the center housing (22), thereby being prevented against a direct contact with the inner periphery of the center housing (22).

Abstract: Bearing apparatus for movable vane compressor is provided with a pressure-reducing passage extending from an annular clearance between the inner side surface of the bearing and the side surface of the rotor to the open air or the like, such as the suction-chamber and the suction-working space. Compressed air enters the annular clearance through a gap between the inner side surface of the side housing and the side surface of the rotor from the compression-working space between two adjacent vanes and then runs out through the pressure-reducing passage without pushing the bearing grease from the bearing.

Abstract: A method of manufacturing a rotor for rotary fluid pumps comprising the steps of assembling a hollow cylindrical body and both side plates to a hollow rotor body, providing the hollow rotor body with a plurality of sockets each receiving a separately fabricated U-shaped vane-groove forming member, and inserting the U-shaped vane-groove forming members into the respective sockets to fix the same to the rotor body by brazing. The U-shaped vane-groove forming member is made from a suitable material as a vane groove itself and sufficiently finished independently from the rotor body.

Abstract: Apparatus in a vane type rotary compressor for floatingly supporting a rotary sleeve which is mounted in a center housing for rotation with a plurality of vanes movable in a rotor, the apparatus comprising an air-bearing room defined between the inner periphery of the center housing and the outer periphery of the rotary sleeve and supplied with the maximum-pressure or discharge-pressure air through an air-supply passage extending from the discharge chamber or compression working space under the maximum pressure. The air-supply passage is formed with an accumulator for reducing the pulsations and/or temperature of the supplied air. The accumulator is composed of either or both of a relatively large hollow in the thickened wall of the center housing and a plurality of fine bores and alternative grooves forming a S-shaped hole in the suction side wall.

Abstract: A rotary compressor provided with a rotary sleeve mounted in a center housing for rotation with a plurality of vanes radially slidably fitted in a rotor which is eccentrically disposed in the rotary sleeve, and an air bearing room defined between the outer periphery of the rotary sleeve and the inner periphery of the center housing and internally connected to compressed air in the compressor, characterized in that a multiplicity of air-accumulating grooves are formed in either or both of the outer periphery of the rotary sleeve and the inner periphery of the center housing to increase the bearing capacity of the air-bearing room and prevent the rotary sleeve from directly contacting the inner periphery of the center housing even if the high-pressure in the rotary sleeve pushes aside the rotary sleeve.

Abstract: A hollow cam shaft of the type wherein lubricating oil is distributed to the cam portions includes a rod member positioned inside the shaft pipe member and spaced from the inner pipe surface by shaft end members and guide strips to form a reduced, annular volume to be filled with oil during engine start-up. The method of making the hollow cam shaft includes forming the rod member from a resinous material by injection molding, using a removable mold positioned in the pipe through-hole, and, in a preferred embodiment, flowing the resin through the mold cavity and into a recess located in the distal shaft end member, which recess has an enlarged portion for capturing the hardened resin rod end and facilitating mold removal.

Abstract: A hollow cam shaft of the type wherein lubricating oil is distributed to the cam portions includes a rod member positioned inside the shaft pipe member and spaced from the inner pipe surface by shaft end members and guide strips to form a reduced, annular volume to be filled with oil during engine start-up. The method of making the hollow cam shaft includes forming the rod member from a resinous material by injection molding, using a removable mold positioned in the pipe through-hole, and, in a preferred embodiment, flowing the resin through the mold cavity and into a recess located in the distal shaft end member, which recess has an enlarged portion for capturing the hardened resin rod end and facilitating mold removal.

Abstract: A vane-type rotary compressor has a rotary sleeve (30) mounted in a center housing (22) for rotation with a plurality of vanes (16) movable in a rotor (10). The rotary sleeve is floatingly supported in an air-bearing room (40) defined between the outer periphery of the center housing. The air-bearing room has a supply of air through an inlet port (71) internally connected to a discharge chamber (41) or a compression working space (43) under the maximum pressure. At least a pocket (73, 74) is provided in the inner periphery of the center housing to increase the bearing performance of the air-bearing room and protect the rotary sleeve and the center housing against scuffing and seizure troubles therebetween.

Abstract: A rotary-type fluid compressor is disclosed. The compressor includes a housing having a vane groove therein which is fitted with a vane. The vane is comprised of a specific soft nitrided hardened steel material which includes 0.50 to 1.30% carbon by weight, 11.0 to 20.0% chromium by weight, with the balance being Fe. The hardened steel material can be further improved by the inclusion of one or both of 0.1 to 1.50% Mo and/or 0.07 to 0.15% by weight of V. Specific characteristics relating to the mating member over which the vane slides are also disclosed. Due to the particular material utilized for producing the vane and the characteristics of the mating member over which the vane slides, improved results are obtained with respect to wear resistance.

Abstract: A hollow portion of a tubular shaft (1) contains an elastic filler element (4) which has projections (6) formed on the outer periphery thereof. A lubricating-oil passage is defined between the inner peripheral surface of the hollow portion of the shaft (1) and the outer peripheral surface of the filler element (4) by the projections (6) which are in close, resilient contact with the inner peripheral surface of the hollow portion. Since the lubricating-oil passage has a relatively small volume, lubricating oil quickly fills into the passages and is supplied to the sliding surfaces of the cams during the start up operations.

Abstract: The method of manufacturing a lightweight, low cost hollow cam shaft includes the steps of forming an integral journal portion in a hollow pipe member by inwardly deforming a portion of the pipe member, such as by coining or spinning, the outer surface of the deformed portion being the bearing surface. Annular grooves formed immediately adjacent the inwardly deformed portion allow residue from an optional finish-grinding operation to escape. Cam members having fitting holes are fixedly mounted on undeformed pipe portions, or on outwardly deformed pipe portions.

Abstract: A piston ring having an improved wear resistance and antiseizure properties and good workability is disclosed. The piston ring is made of a martensite stainless steel comprising from 0.4 to 0.7 wt % C, 0.3 to 1.0 wt % Si, 0.5 to 1.0 wt % Mn, and 2.0 to 9.0 wt % Cr, the balance being iron and impurities. Additionally, a surface-treated layer having a quench and temper hardness (H.sub.R C) of 40 to 50 is formed on at least that part of the piston ring which slides against the wall of a cylinder in which reciprocates a piston on which the piston ring is mounted. Preferably, the surface-treated layer is formed by hard Cr plating.

Abstract: Method of manufacturing a radially corrugated expander-spacer for a piston oil ring assembly, having inner and outer crowns alternately and successively laid, which can prevent its both terminal ends from nesting together during assembling of the piston oil ring assembly. The inner crowns each includes an inner peripheral piece and an opening having a circumferential width larger than that of the inner peripheral piece, and the outer crowns each includes an outer peripheral piece and an opening having a circumferential width larger than that of the outer peripheral piece. The manufacturing method comprises the steps of filling thermosetting synthetic resin having bonding force with respect to metals into the openings of inner crowns at both terminal ends of the expander-spacer, and thereafter, setting the thus filled thermosetting synthetic resin so that the resin is fixedly secured to the openings of the inner crowns at both terminal ends of the expander-spacer.

Abstract: A coating material for use in oil-free type sliding members comprising a powder mixture prepared by mixing a finely powdered resin mixture composed of 70 to 90 weight % of finely powdered tetrafluoroethylenehexafluoropropylene copolymer resin and 10 to 30 weight % of finely powdered polyimide resin with 5 to 15 weight %, based on the total weight, of one or more of ZrO.sub.2, SiC, Si.sub.3 N.sub.4, Al.sub.2 O.sub.3, carbon C and tetrafluoroethylene resin of 0.2 to 1.0 micron meter in particle size is applied, as a suspension, onto sliding members, and baked to form a coating thereon.

Abstract: A hollow rotor for movable vane pumps and the like having a pair of right and left cup-shaped bodies each being separately shaped from steel or aluminum alloy in the form similar to either of axially bisected parts of a complete rotor. The right and left cup-shaped bodies have the respective open side faces abutted and joined to each other by butt resistance welding to be incorporated into the complete hollow rotor.