Piston construction for automobile engines

摘要

The present invention relates to a piston structure for an automobile engine, in which a skirt (15) formed by passing a coupling groove (14) through which a first end of a connecting rod is coupled is formed in a cylindrical shape, A first ring groove 16, a second ring groove 17 and a third ring groove 18 in which a piston ring is installed are formed on the upper part of the skirt 15, The first land 11, the second land 12 and the third land 13 are formed between the first ring groove 16, the second ring groove 17 and the third ring groove 18, An oil drain hole 18a is formed in the third ring groove 18 so as to allow excess oil to escape into the piston 10. The oil drain hole 18a is formed in the third land 13, The excess oil flowing into the cylinder is introduced into the piston through the oil drain hole as well as the oil discharge hole to lubricate the piston pin, The frictional resistance of the piston pin is reduced, the power loss due to the friction is reduced, and the engine efficiency is enhanced.