Abstract: A pair of opposed pistons (17) are interconnected by a connecting link assembly (19) defining opposed parallel guide surfaces (24), transverse to the axes of the pistons. A drive block (28) is rotatably mounted on a crankpin (16) of a crankshaft by a bearing shell (71a, 71b) and has parallel bearing plates (31) slidably engaged with the guide surfaces (24). Lubricating oil is supplied to ports (59) in the bearing plates, just before each plate is substantially loaded, from leading and trailing drillings (56L and 56T) in the crankpin (16), ports (76, 77) in the bearing shell and passages (73, 74, 75) in the drive block.

Abstract: A main bearing for an internal combustion engine includes a top half and a bottom half joined along edges to from a sleeve for surrounding a main bearing of a crankshaft. A pair straight recesses, parallel to the bearing axis and the joining edges, are disposed on an internal surface of the bottom half of the bearing so that oil can puddle there, capture debris, and prevent dry starts of the internal combustion engine. A separate set of oppositely angled grooves are disposed on the internal surface of the bottom half of the bearing and outside the pair of straight recesses. The first angled groove removes excess oil from the front or back of the bearing and the second angled groove returns sufficient oil to maintain adequate surface bearing lubrication.

Abstract: A sliding bearing (10) having an inner surface (13a) provided with at least one circumferential recess (15, 16) extending over a portion of the axial dimensions of the inner surface (13).The recess (15, 16) is located over one portion of the inner surface (13a) which is subjected to a peak oil film pressure (POFP) higher than a minimum value previously calculated for, and/or located up to 45 degrees upstream considering the rotation direction of the shaft, in one region of the inner surface (13a) where the minimum oil film thickness (MOFT) is less than a value previously calculated. Each circumferential recess (15, 16) is defined by a maximum radial depth E, a circumferential range given by the angle .alpha., which vary according to construction and operational features of the bearing (10), in order to cause the values of pressure and/or oil film thickness to meet values previously calculated for the bearing (10).

Abstract: A connecting rod for connecting a reciprocating piston to a rotating crankshaft of an internal combustion engine includes an improved lubrication distribution system for conveying lubrication into its crankpin bearing. The lubrication is distributed by means of a pair of radial bores one of which extends through the cap of the crankpin bearing and the other of which extends through an arcuate-shaped crankpin bearing portion integrally formed at the end of the connecting rod. The bores are located diametrically opposite one another, and each bore includes an outlet opening into the crankpin bearing hole. The outlets are oval in cross-section and have chamfered sidewalls with an angle of between 30.degree. to 60.degree. with respect to the bore.

Abstract: A sliding bearing for an internal combustion engine; the sliding bearing having a groove formed substantially circumferentially on an inner circumferential face of the sliding bearing; the width of the groove being smaller than 0.6 mm, and the ratio of the width of the groove to depth of the groove being larger than 40.

Abstract: A bearing halfshell for internal combustion engine connecting rods with its inner surface having a substantially constant radius of curvature from a central plane of symmetry to two portions of the inner surface located one on each side of the central plane of symmetry and on a corresponding radial plane. The radial plane forms an acute angle .alpha. with a bearing parting plane, the remaining end portions of the inner surface from the radial plane to the end of the bearing being defined by surfaces with extra relief so that the bearing thickness gradually decreases away from the central plane of symmetry in an accentuated manner as compared to the constant radius of curvature of the inner surface. Thereby, two chambers are formed in the end portions, with an eccentricity .epsilon., of the inner surface ensuring a stable film of oil between the bearing halfshell and a corresponding shaft, and reducing the operating temperature of the bearing halfshell.

Abstract: An engine bearing for internal combustion engines having a semi-cylindrical shell portion with an inwardly facing bearing surface, adapted to surround a journal, which is divided circumferentially into a concentric central portion and a pair of eccentric end portions. The eccentric end portions extend outwardly from the opposite ends of the central portion a progressively increasing distance to the ends of the shell to form a split line relief portion. An eccentric lubricant supply groove is formed in the inwardly facing bearing surface tapering from a point of maximum depth at the central portion of the shell to terminate within each of the eccentric end portions thereby forming lubricant metering orifices at the interface of the concentric central portion, the eccentric end portions and the eccentric lubricant supply groove to control the flow of lubricant to the split line and reduce the pressure loss through the bearing.

Abstract: A bearing arrangement including a plain bearing consisting of a laminated body of a bearing layer and a backing metal supporting the bearing layer. The backing metal is made of a material whose modulus of elasticity is lowered by cold working (austenitic stainless steel), and the bearing layer and the backing metal are joined to each other by cold rolling. Since a working proportion of the backing metal upon the above-mentioned cold rolling is small in the inside portion held in contact with the bearing layer but is large in the outside portion, the modulus of elasticity of the backing metal is different between the inside portion and the outside portion thereof, and the modulus of elasticity in the outside portion is smaller than the modulus of elasticity in the inside portion. Also, the hardness of the outside portion is higher than the hardness of the inside portion.

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 half-round bearing including a locating tab for establishing the positioning of the bearing shell when being mounted within a bearing housing. Generating tabs according to the prior art leave a radially outwardly projecting channel in the bearing crown surface which has been found to create slivers during finishing of the bearing shell wall thickness which can adversely influence bearing life. According to this invention, the bearing material is upset by coining in a manner such that the excess material is removed during the parting line broaching operation without causing a burr to be formed on the tab. The burr can prevent proper seating of the bearing shell in the bearing housing which reduces bearing life.

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 hydrodynamic journal bearing including a rotary journal shaft which is circular in cross section, a journal bearing surrounding the journal shaft and having at least two arcuate bearing surfaces, each arcuate surface defined by a radius slightly greater than that of the journal shaft so that the journal shaft will be in lubricated contact with at least the mid portion of each arcuate bearing surface while the ends of each arcuate bearing will be spaced from the surface of the rotary journal shaft, and seals to assure that lubrication almost completely fills all spaces between the rotary journal shaft surface and that of the journal bearing surface.

Abstract: An engine bearing or bushing having a cylindrical inner bearing surface which is slightly offset relative to the outer surface of the bearing. The amount of offset is very small and the offset is in a direction generally away from the portion of the bearing exposed to the maximum load. The inner bearing surface is offset so that the oil clearance between a journal member and the maximum load portion of the bearing is minimized to reduce oil film pressure and increase oil film thickness in that region. The offset increases the clearance between the journal member and bearing at a low load area of the bearing to increase oil flow and reduce oil temperature. The transition from the high clearance area to minimum clearance area is uniform so that the oil film thickness will also increase uniformly to its maximum potential.

Abstract: The improved rotor bearing lubricating system for the rotor bearing of a Wankel type rotary internal combustion engine comprises an arcuate distribution channel in the surface of the eccentric portion of the mainshaft adjacent the inner bearing surface of at least 180.degree. in length and extending on both sides of an imaginary radial line passing through the point of the maximum throw of the eccentric portion.

Abstract: A sleeve bearing composed of a halfshell (20) installed in the connecting rod having a reduced or inexistent eccentricity, defining a substantially constant clearance between the halfshell and a journaled member (30), and a halfshell (21) installed in the connecting rod bearing cap having an eccentricity, defining between the halfshell and the journaled member (30), at the point corresponding to the halfshell centerline, a clearance equal to that between the halfshell (20) and the journaled member, the said clearance increasing from the centerline toward the parting line B.

Abstract: A journaled bearing assembly including a pair of semicircular half shells defining a sleeve bearing with an outer surface and an inner bearing surface with the surfaces extending axially between laterally spaced opposite ends and circumferentially between oppositely disposed parting faces with the bearing surface being concave and the outer surface being convex axially between the ends while in the free state and held at gage diameter. In the free state the terminal portions adjacent the parting faces are on a longer radius than the radius of the central portion. When held at gage diameter the terminal portions are on a radius equal to the radius of the central portion. The bearing sleeve is disposed in a bearing housing with the bearing surfaces in engagement with a journaled portion of a shaft. The bearing housing includes clamping members in clamping engagement with the outer surfaces of the half shells to apply radical forces to the half shells.

Abstract: A split multipiece flanged journal bearing for use as an engine crankshaft thrust-journal bearing or the like wherein the thrust flanges and journal bearing shells are semi-cylindrical and have interlocking means to prevent rotational motion of the thrust flange relative to the respective bearing shell and with potential replacement interchangeability so that any worn or damaged parts may be replaced without changing the whole bearing and so that any one or all thrust flanges may be replaced without removing the crankshaft from the engine and wherein the notch and interlocking lug at one end of a particular combination of thrust flange and bearing shell is of greater arc length than those at the other end to provide a fail-safe feature to assure correct assembly.