Abstract: The present application provides a piston assembly. The piston assembly may include a cylinder bore extending from a thrust side to an antithrust side and a piston positioned within the cylinder bore. The piston may include a top land, a second land, and a skirt with an axis extending therethrough. The piston may include a tight land profile with an offset about the axis of the skirt.

Abstract: A piston/piston ring arrangement for an internal combustion engine has a piston that is provided with at least one piston ring accommodated in a ring groove, which ring has a ring gap. A spring element is disposed between the groove root of the ring groove and the piston ring, which element fills the ring gap of the piston ring. A modular unit is composed of such a piston/piston ring arrangement and a cylinder or a cylinder sleeve of an internal combustion engine.

Abstract: A fuel system may include a fuel pump and a drive shaft. The fuel pump may include a reciprocating member and the drive shaft may include a lobe member engaged with the reciprocating member. The lobe member may linearly displace the reciprocating member and drive the fuel pump. The lobe member may include a first lobe having a first opening flank driving a first compression stroke of the fuel pump through engagement with the reciprocating member. The first lobe may have a profile providing a constant velocity for the linear displacement of the reciprocating member for a portion of the first compression stroke.

Abstract: A piston compressor has a cylinder including a traveling piston sealed therein. A drive motor acts on a crankshaft, a drive shaft thereof being received by a bore of the crankshaft. A connecting rod provides for articulated connection of a crankshaft-journal of the crankshaft with the piston in a connecting rod bearing. The connecting rod is disposed relative to the drive shaft in an angled orientation that counteracts bowing deflection of the drive shaft that occurs during operation to protect against undesirable wear of the piston seal and of the connecting rod bearing.

Abstract: A drive and guide means for a load to be moved which comprises a rodless drive piston adapted to be driven by a pressure medium in a pressure medium cylinder, such piston having at least one force transmission part extending outward through a longitudinal slot in a wall of such cylinder. A flexible sealing tape for seals off the longitudinal slot on either side of the force transmission part. An anti-friction bearing arrangement serves to take up a load and/or to guide the piston, such anti-friction bearing arrangement being arranged in the housing of the pressure medium cylinder. An anti-friction bearing arrangement is arranged within the cylinder space of the pressure medium cylinder in or on the drive piston. This means that pressure medium cylinders with an extremely small cross section and an extremely simple structure may be produced economically.

Abstract: A piston for an internal combustion engine comprises at least a pair of ribs arranged between an inner surface portion of a skirt and side portions of pin bosses. The ribs are symmetrical with respect to a thrust center line of the piston and have in a longitudinal direction thereof a center line which is positioned to be lower than an axis of a piston pin.

Abstract: A piston of an internal combustion engine, arranged to suppress engine noise and vibration while improving the frictional resistance and seizure resistance of a piston skirt. The piston skirt of the piston is formed at its outer peripheral surface with a pair of depressions. A projection having a spherical surface is formed at the bottom surface of each depression and protrudes radially and outwardly relative to the piston skirt. A heat-resistant pad is loosely fitted in each depression and has a cylindrical inner surface which is in slidable contact with the spherical surface of the projection, so that the pad makes its swinging movement in accordance with the oscillating rotational movement of the piston body around the axis of a piston pin during the reciprocating action of the piston.

Abstract: The piston comprises a crown (12), and a skirt 30 made of plastics material secured to the crown. The crown (12) is formed integrally with a depending boss (16) arranged to receive a gudgeon pin (18) by which the piston is connected to a connecting rod (24). The skirt (30) encircles the boss (16) and is spaced therefrom.

Abstract: A compressor includes a passage in the sidewall of the cylinder for directing compressed gas against circumferential surfaces of piston rings. The pressure of the gas from the passage counteracts the pressure of gas between the piston ring groove and the piston ring, and urges the piston rings inwardly. The force with which the piston ring is urged into engagement with the cylinder walls is lessened, thereby reducing wear of the piston rings. The arrangement is especially useful for compressors having piston rings formed of low friction polymeric materials, such as fluorine-containing polymers.

Abstract: The present invention relates to an oilless reciprocating compressor and expansion apparatus each comprising a piston body to which a piston ring made of a self-lubricating material is fitted and a metal cylinder, and in the first invention and the second invention a self-lubricating material can be formed on the piston itself or on the circumferential surface side thereof without influencing adversely the durability of the piston itself by the compression heat at the piston top, and in the third invention a ring groove formed into the shape of the letter C whose ends are spaced a little is provided in the piston circumferential surface at least whose surface side is made of a self-lubricating material, and said ring groove is positioned on the side thrust line orthogonal to the piston pin, so that the compression efficiency is improved.

Abstract: A piston for a reciprocating machine includes a split piston ring which is located in a circumferential groove in the cylindrical wall of the piston. The piston is adapted to be located in a cylindrical bore so that the piston ring sealingly engages the bore with a gap between its ends, the gap being fully underlaid and sealed by a contiguous unbroken annular supporting ring, a spring being provided to maintain the ends of the piston ring in engagement with the supporting ring.

Abstract: A piston comprises a crown part, a piston under part, a first shoulder at a thrust side formed between the crown part and the piston under part, a second shoulder at an anti-thrust side formed between the crown part and the piston under part, a first in-low part at the thrust side formed in the piston under part, and a second in-low part at the anti-thrust side formed in the piston under part, wherein a thickness of the first shoulder is formed thinner than a thickness of the second shoulder, and a height of the first in-low part is formed smaller than a height of the second in-low part.

Abstract: Gas cushions are maintained between a piston and a cylinder of a gas lubricated reciprocating engine which are effective in retarding the approach of the piston to the cylinder wall under the thrust of side forces from the connecting rod. The cushion are maintained by viscous flow forces for sufficient time exceed a half cycle of crankcase rotation.

Abstract: Located in a stationary frame is a cylinder-piston unit, the piston of which is adapted to displace the bearing housing of a roll in a paper-making machine at right angles to the longitudinal axis thereof. The bearing housing is guided in the frame with the aid of linear guide-elements. The radial play between the piston and the cylinder-bore is greater than the transverse play between the said linear guide-elements. Furthermore, the axial length of the piston is less than the depth of the cylinder-bore. Whenever the cylinder-piston unit is relieved of its load, and the cylinder thus returns to its position of rest, it is centered in the cylinder-bore by means of a centering device.

Abstract: In an engine of the type having opposite side wall portions more or less differing from each other in rigidity, as in a so-called side valve engine, the axis of the piston unit is set at such an angle of inclination relative to the axis of the associated cylinder bore that the two axes substantially coincide with each other in the power or explosion stroke of the engine cycle when the cylinder block is tilted, under the tensile load acting on the engine structure, on account of the differential rigidity of the opposite side walls thereof. With this axis arrangement, an uneven wear of the mating bearing surfaces of the piston and cylinder and of the crankpin and bore in the large end of the associated connected rod is effectively prevented.

Abstract: In its simplest form an oscillating steam engine is limited to low pressure operation by a spring or set screw holding the cylinder against a stationary valve plate. This invention features trunnions not rigidly connected to the oscillating cylinder and pressure equalizing cylinder, making possible a wide and rapid variation of steam pressure and temperature with minimal valve and pressure equalizing cylinder leakage and trunnion friction and misalignment. In a compound or multiple expansion engine, high pressure steam can be fed to the low pressure cylinder for starting the engine or for increasing the power output. Automatic condensate relief is also provided for without separate manually operated valves.

Abstract: An internal combustion engine crosshead piston assembly having an outer skirt elastomerically mounted on an inner skirt to reduce piston-slap-caused noise.

Abstract: An internal combustion engine crosshead piston assembly having an outer skirt mounted by an elastomeric member on an inner skirt to reduce piston-slap-caused noise wherein expansible chambers are provided in the elastomeric member and are connected by orifices in the inner skirt to receive and eject oil to provide cooling of the outer skirt and also add a damping effect to further reduce the noise.