METHOD FOR THE MANUFACTURE OF A COOLED ENGINE PISTON

摘要

A method for the manufacture of a cooled piston head 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 plate 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 defined by a circumferential groove on the head upper portion and the peripheral outer surface of the metal plate.