Abstract: A fixing device for fasteners having a polygonal head for the detachable connection of flanges which can be connected to one another and clamped against one another by a screw connection includes a chain which encompasses at least some regions of the lateral surface of the polygonal heads in a form-fitting manner and inhibits the rotation of said fasteners. The chain comprises a plurality of spaced members, each having at least one receptacle, the inner profile of which corresponds to the lateral surface of the polygonal heads. The chain comprises at least one releasable tensioner for detachably joining two ends of the chain. A flexible securing means is provided, which extends circumferentially along the chain, wherein at least two ends of the securing means can be releasably connected to one another.

Abstract: A method for screwing together two metal parts that are spaced apart from one another close to a screw connection element and elastically deformable relative to one another, and for the remainder lie against one another. In order to obtain a firm and secure screw connection, with little expenditure of torque, one of the metal parts is deformed, before the metal parts are screwed together, in such a manner that regions close to the screw connection element come close to one another, and the metal parts are then screwed together. A region of the one metal parts remains deformed after they have been screwed together, as a result of the screw connection element.

Abstract: The invention relates to an assembled piston (1) for an internal combustion engine, said piston consisting of an upper part (4) provided with a combustion cavity (8), and a lower part (5) that is screwed to the upper part (4) by means of a screw (6) which is arranged coaxially to the piston axis (31). Said screw (6) is embodied as a set screw comprising a hexagon socket (6?) on the inner side of the piston and a head (6?) on the bottom side of the piston, the head (6?) forming part of the bottom of the combustion cavity (8) and being flush therewith (8) in the screwed state.

Abstract: A piston for a combustion engine includes an external cylindrical body having an inner cavity. In the inner cavity is a partly spherical little-end of a connecting rod and a fluidtight shell or hemispherical dome. An edge portion of the dome is annularly connected a lower part of the cylindrical body so that the shell or dome bears on the little-end along a closed circular contact line or band during rest or minimum pressure parts of the cycle of operation. Oil is supplied under pressure and through a check valve to into an interstice between the little-end and the shell above the contact line. An upper incompressible space is provided between an outer surface of the shell and the cavity. The shell is maintained taut in operation between the little-end and an annular zone by which the edge portion is connected to the lower part of the cylindrical body.

Abstract: An internal combustion engine piston assembly is provided wherein the underside of the piston has planar load bearing surfaces disposed perpendicularly to the axis thereof and the ends of the piston pin are provided with mating planar surfaces for fastening the pin to the underside of the piston head. The piston pin further includes a cylindrical bearing surface disposed between the ends for connection to the connecting rod.

Abstract: Piston has upper and lower portions. The upper portion includes a cylinder engaging surface, such as a piston ring, comprised of solid lubricant. The lower portion includes a cylinder engaging surface comprised of liquid lubricant control means. The distance between the upper and lower cylinder engaging surfaces is sufficient to provide a temperature differential of at least 316.degree. C. (600.degree. F.) between the upper and lower portions during normal engine operations. This differential is adequate to maintain the temperature of the cylinder at the bottom ring reversal point at a temperature below the breakdown temperature of a liquid lubricant when the temperature of the cylinder liner at the top ring reversal point is at a temperature above the breakdown temperature of the liquid lubricant.

Abstract: A split piston in an internal combustion engine, having a base rockably secured to the connecting rod, and a detachable ring head which interfaces with the cylinder wall. The detachable ring head is snugly fitted onto a cylindrical extension of the base having an axis parallel to the cylinder walls, to allow removal on the head without removal of the engine crankshaft or connecting rod. The snug fit minimizes combustion gas losses and eliminates to need for gas tight seals, while allowing removal of the head. Threaded fasteners are used to secure the head to the base.

Abstract: A multisectional piston for opposed-piston, slider-crank-drive internal combustion engines. The piston has a ceramic skirt (1), a skirt head (2), and a ceramic piston head (3) with fire land (4). The ceramic piston head is provided with annular groove (6) for receiving a slotted, ceramic piston ring (7) and is seated on the skirt head (2). A ceramic, common centering sleeve (5) fixes the skirt and head. Metal or metal alloy centering piece (8) fixed on the piston rod (12) in snug fit (14) has a base plate (9) on which the skirt head seats. An end cover (10) seats on the piston head and has a centering hub (11) axially spaced by a gap (23) from the centering piece. In assembly, the skirt head and piston head are axially clamped between the end cover and the base plate by a screw connection (13).

Abstract: A piston for internal combustion engines is disclosed, which includes a piston main body of metallic material, and a ceramic piston head member embedded in the top portion of the piston main body. The piston head member is formed on its peripheral surface with one or more extensions of dovetail section protruding radially outwards and having an axially measured thickness which increases toward the outer end thereof. The piston head member is retained in place with a substantially constant retaining force, even during the operation of the engine.

Abstract: An improved piston for operation within a cylinder. The piston includes a main piston body having a primary cylindrical surface, a first end, and a secondary surface of smaller diameter, the secondary surface of smaller diameter is disposed between the primary cylindrical surface and the first end. At least one piston ring is disposed and captured in an operational position about the secondary surface of the piston body by a releasably mounted cap positioned on the first end of the piston body.

Abstract: A built-up piston in which the piston top (11) and piston bottom part (13) are clamped together by two necked-down bolts (15) by means of nuts (16). The nuts include an extension (21) having an external thread (22), by means of which they are screwed into the piston bottom part (13). An oil scraper ring (14) is arranged between piston top (11) and piston bottom part (13) so that leakage oil out of the cooling oil channel of the piston is conducted back into the crankcase by way of the oil discharge channels of the annular groove of the oil scraper ring.

Abstract: A piston for an internal combustion engine comprising a piston body (1) and a crown portion (3) that are connected by anchoring means comprising elongate members (7,23,26,79,80) that extend from the crown portion (3) into the piston body (1) so as to transmit tensile and compressive loads from the crown to a portion of the piston body in a region spaced axially away from the crown portion at a temperature which, at maximum operating temperatures, is low enough to prevent loosening of the anchoring means, characterized in that co-operating surfaces of said anchoring means (7,9,16) and piston body (1) are pre-loaded into contact with one another by virtue of mechanically applied strain energy stored in the anchoring means and piston body (1) and which acts axially to prevent parting of said co-operating surfaces by said tensile and compressive loads without being dependent on any reaction forces between the adjacent faces of the crown portion and piston body.

Abstract: Internal combustion engine piston of the composite type, having a steel upper portion surmounting an aluminum lower portion in which the piston ring grooves are provided.The lower portion (2) comprises a concentric circular cavity (3), open at the top and recessed from the ring grooves (5), said cavity being covered by an annular groove (7) in the lower surface of the steel upper portion (1) to form a dead space.

Abstract: The disclosure illustrates an insulated composite piston comprising a crown of ceramic or other heat resistant material secured to an aluminum piston body by a bolt of temperature resistant alloy. A low conductivity interface between the crown and the body is provided by a series of stacked discs having low effective thermal conductivity. The relative thermal expansion of the parts is compensated for by bellville washers on the bolt. The above arrangement insulates the crown from the piston body thereby minimizing the temperature gradient across the crown so that its temperature can be maintained as high as necessary to increase efficiency and minimize noxious emissions.

Abstract: A reciprocating piston device, such as a pressure pump, a vacuum pump or a compressor comprising a cylinder and a piston reciprocable in the cylinder. The piston includes a piston body having a cavity therein and a pivot arm mounted on the piston body for pivotal movement in the cavity. The pivot arm has a passage therein which is within the piston body and which receives a rotatable drive member, such as an eccentric. As the eccentric is rotated, the piston is reciprocated within the cylinder with the pivotal movement of the pivot arm accommodating one component of movement of the eccentric.

Abstract: A piston having a crown and a body connected together by bolts. The bolts pass through an annular gap defined by a pair of concentric ring members located between the crown and the body. One of the ring members is relatively resilient and the other ring member is relatively rigid. Such a construction reduces fretting between the crown and the body when the piston is in operation in an engine.

Abstract: An improved piston assembly including a generally cylindrical piston body having a crown and a depending skirt and being formed of a light-weight metal, an annular ring groove protection band formed of a hard metal disposed about the body adjacent the crown and having at least one peripheral groove adapted to receive a compression ring, and securing devices including a plurality of elongated threaded fasteners clampingly securing the band to the body, the threaded fasteners extending longitudinally of the body and having a length sufficient to store substantial clamping energy whereby the components of the assembly will not loosen during use of the assembly.

Abstract: A light weight piston assembly including a piston body formed of a light-weight metal and having a crown and a depending skirt, an annular recess about the end of the body adjacent the crown and opening toward the crown, the portion of the recess immediately adjacent the crown being threaded, a hard metal ring groove protection band having a peripheral, radially outwardly opening ring receiving groove disposed in the recess, at least one annular wavy spring in the recess, and a nut threaded on the threaded portion securing the band and the spring within the recess such that the spring is compressed to store energy to tightly hold the band against movement relative to the body during various piston operating conditions.

Abstract: A disjoinable assembly designed for connecting of piston with piston rod in ngines and machines, this assembly being particularly suitable for use in compressors, includes an insert [4] and a bolt connector [3] mounted in the said insert, said connector co-operating with piston rod [2]. The insert [4] is U-shaped in cross-section, it has preferably the form of a cylinder with bottom [8] at one end, said bottom having a hole [9], and it is provided with bearing surfaces [12] in the form of splineways [10] or splines [14] , said bearing surfaces [12] being matched with bearing surfaces [13] made in the form of splines [11] or splineways [15] on the piston rod [2] . The insert [4] is fixed in position relative to piston [1] and piston rod [2] by means of dogs [20] , said dogs being formed by bending the sections of rim [16] toward one or more sockets [6] made in piston [1] , and by bending the other sections of the said rim [16] toward one or more sockets [17] made in connector [3].