Patent ID: 7107893

Claim:
Piston pin bearing for an internal combustion engine, having pin bores in which a piston pin is mounted, wherein the mantle surface ( 5 ) of the pin bore ( 2 ) is shaped in highly oval shape along the entire supporting pin length, in the region of the pin boss equator-pin boss zenith-pin boss equator, and the parameter representation of the oval follows, where x is a longitudinal Pin boss axis, y is a longitudinal piston axis and the z is a crosswise pin boss axis: x=b/ 2×cos α} y=a/ 2×sin α} for 0°≦α≦180° and is configured in circular cylindrical shape in the region of the pin boss equator-pin boss nadir-pin boss equator, where: a: great oval diameter; b=D: small oval diameter; D: diameter of the cylindrical pin boss part; α: angle that any desired ray forms relative to the z axis.