Patent ID: 9687942
Date: 2017-06-27
CPC Classifications: B23P,F02F,F16J

Claim:
1. A method, comprising: providing a piston having a piston body defining a piston axis, the piston body including radially inner and outer body mating surfaces; assembling an annular ring with the piston body such that the piston body and the annular ring cooperate to form a continuous upper combustion bowl surface having a radially inner portion defined by the piston body and a radially outer portion defined by the annular ring, the annular ring including a radially inner ring mating surface and a radially outer ring mating surface; joining the body to the annular ring along at least one of the radially inner and outer mating surfaces of the body and the annular ring; wherein the annular ring and piston body cooperate to define an annular gap therebetween that is left empty or includes air therein during an operation of the piston, forming a thermal break between the combustion bowl and the piston body, the annular gap positioned to thermally insulate the piston body from the annular ring during the operation of the piston; and wherein the annular gap has a thickness of approximately 1 mm.