Light-metal piston for internal combustion engines
AssigneeMahle GmbH
InventorMartin Lutz
Life of this patent
Estimating the term…
Abstract
In order to improve the guidance of a light-metal piston for an internal combustion engine of a motor vehicle by obtaining a uniform behavior under different stresses of the pressure and/or counter pressure side of the piston skirt, the wall thickness of the piston skirt is made different in the region of its pressure and/or counterpressure regions from that in its other regions. In the pressure and counterpressure regions, there is a thickening on the inner side of the piston skirt which is gradually reduced from the lower edge of the skirt in a central plane in the piston length and pressure/counterpressure direction back to the normal thickness.
Claims4
A light metal piston for internal combustion engines, comprising:
- a piston crown;
- a piston bottom;
- a piston ring groove part;
- and
- a piston skirt, said piston bottom, said piston ring groove part and said piston skirt being integrally shaped in one piece, said piston skirt having a wall, a bottom edge, a height, an inside contour, a circumference, a pressure side and a counterpressure side,
- wherein the wall forms a thickening only in the area around at least one of the pressure and counterpressure sides, and wherein the thickness of the wall substantially continually decreases, starting from the bottom edge of the skirt along the height of the skirt, such that the inside contour of the skirt extends substantially conically.
Dependencies are inferred from the claim text.