Patent ID: 9133763
Filing Date: 2015-09-15
Classification: F02B

Abstract:
1. A method of establishing and maintaining a piston compression height during portions of a combustion cycle in a differential-stroke cycle combustion engine, the engine including one or more two-part pistons, each two-part piston having a first piston part and a second piston part operated by a piston stem which is slidably coupled to the first piston part, the method comprising: providing a piston seat cup coupled to said first piston part and a piston seat cover operatively associated with said piston seat cup and defining a sealed piston seat cavity; abutting said second piston part with said piston seat cover and moving said piston seat cover relative to said piston seat cup; aligning a fluid ingress aperture with a cooperating piston rod passage and piston pin inlet for a portion of said combustion cycle thereby allowing fluid to enter said piston seat cavity; and aligning a fluid egress aperture with a cooperating piston pin passage and piston rod outlet for a portion of said combustion cycle thereby allowing fluid to exit said piston seat cavity.