Method of the manufacture of a cooled engine piston

摘要

A method for the manufacture of a cooled piston in which the upper and lower portions of the piston head are made separately, a metal plate is placed on the lower side of the upper portion; then the upper portion incorporating the metal place is joined to the lower portion by friction welding. The metal plate is provided with a central hole for the passage of cooling oil onto the undercrown and means of communication with a closed cooling chamber is defined by a circumferential groove on the head upper portion and the peripheral outer surface of the metal plate.