Piston with sealing pressed by pressure of an internal piston chamber

摘要

Pistons are disclosed herein. An example apparatus includes a piston defining a chamber and a circumferential groove in communication with the chamber. At least a portion of the chamber is to be substantially filled with a fluid. The example apparatus also includes a piston ring disposed in the Chamber and the groove. The fluid is to apply a first pressure to the piston ring to enable the piston ring to apply a second pressure to a cylinder wall. The second pressure is to be greater than the first pressure.