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AssigneeDeutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt e.V.
InventorsBernhard Hinz, Richard Kochendorfer
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To avoid the necessity of piston rings in a piston-cylinder set, it is prsed that the cylinder liner be surrounded by a band consisting of a fiber composite whose thermal expansion in a radial direction is less than that of the cylinder liner, the impediment to expansion presented by the band varying over the length of the cylinder housing; that the piston be constructed with a cap consisting of a piston head facing the combustion chamber and an essentially cylindrical piston skirt adjacent to the cylinder bearing surface, and a force-transmitting core that contains the bearing for the piston pin and the spherical pressure pad; that a force-transmitting connection rotationally symmetrical to the piston's longitudinal axis be provided above the spherical pressure pad; that the cap be connected at the lower edge of the piston skirt to the force-transmitting core, but otherwise no contact be provided between cap and force-transmitting core except in the area of the force-transmitting connection; and that both cylinder liner and cap be fabricated from ceramic material.
Piston-cylinder set for reciprocating, internal combustion engines with a cylinder block having a combustion chamber, especially Otto and diesel engines, with a cylinder liner having an interior bearing surface and located in the cylinder block and a piston facing the combustion chamber supported movably therein along the length of said liner and along its own longitudinal axis, said piston containing a rotational bearing for a connecting rod employing a piston pin held within the piston and incorporating a spherical pressure pad in the piston that contacts two-dimensionally a corresponding spherical pressure pad on the connecting rod, characterized by
Dependencies are inferred from the claim text.