Patent ID: 7594467
Filing Date: 2009-09-29
Classification: F16J,Y10T

Abstract:
1. A piston adapted to reciprocate in a cylinder of an internal combustion engine, comprising: a first portion formed at least in part of a first material with the first portion forming a crown surface of the piston; a second portion formed at least in part of a second material with the second portion forming a piston ring groove of the piston, the piston ring groove being arranged and configured to receive a piston ring; and a third portion formed at least in part of a third material with the third portion forming a crankcase side surface of the piston, the crankcase side surface facing a crankcase of the engine, the second portion being directly sandwiched between the first and third portions to form a three layer structure in an axial direction of the piston with the second material of the second portion having a higher thermal conductivity than that of the first and third materials of the first and third portions.