Piston for internal combustion engines

摘要

The invention relates to a piston for internal combustion engines comprising a lower part which forms the shaft area and also comprising a piston upper part which is connected thereto by means of expandable screws and which forms the bottom and a ring area wherein the expanding screws in the piston upper part ( 1 ) are disposed on pressure pieces engaging in the respective bores in the lower piston part ( 1 ) and wherein the respective disposition between the pressure piece and the lower piston part ( 1 ) occurs via inclined adjacent surfaces. The aim of the invention is to invent a piston which is easy to produce, which in relation to prior art enables improved introduction of forces for the connection of the piston part to the piston. According to the invention, this is achieved by virtue of the fact that the bearing surface of the lower piston part ( 1 ) for the pressure piece ( 2 ) corresponds to the surface of an elongate rotation ellipsoid of general formula x²/a²+y²/a²+z²/c²=1, wherein x, y and z define the co-ordinate axis and a and c define the semi axis whereby a2+y²+Z²=r_k², whereby r_k