Patent ID: 7051684
Filing Date: 2006-05-30
Classification: F02F

Abstract:
1. Oil inlet for an internal combustion engine piston that is provided with a cooling duct, having an approximately circular cover of the cooling duct, to which the oil inlet is attached, and the cooling duct can have a free cooling oil stream applied to it by way of the oil inlet, by means of an oil spraying nozzle rigidly connected with the engine housing, from the crank space, through the free interior of the piston shaft, wherein the inner wall surface of the oil inlet is shaped according to a function of a one-sheeted rotating hyperboloid or of a surface-delimited torus, whereby the shape is determined as a function of the stream position of the cooling oil stream produced by the oil spraying nozzle, with reference to the cross sectional entry area of the oil inlet, and wherein in the case of an approximately perpendicular stream position of the cooling oil stream relative to the cross sectional opening area, the inner wall surface of the oil inlet has a shape that is formed in the right-angle coordinate system by means of rotation of the hyperbolic function y=±.b/a times the square root of x 2 minus a 2 about its y axes, whereby a=6 mm, b=5 mm, and the cross sectional entry area (B) is formed by a parallel cut at the distance y g =c=8 mm relative to the x axis.