Accommodating piston seat for differential-stroke cycle engines

摘要

A piston seat method and apparatus for a differential-stroke cycle combustion engine, the combustion engine including one or more two-part pistons, each two-part piston having a first piston part and a second piston part. The apparatus comprising: a piston seat cover operatively associated with the first piston part, the piston seat cover being adapted for abutting engagement with the second piston part; wherein, upon abutting engagement, the seat cover is adapted to move relative to the first piston part, thereby at least partially absorbing impact forces applied between the first piston part and the second piston part.

主权项

1. A piston seat apparatus for a differential-stroke cycle combustion engine, the combustion engine including one or more two-part pistons, each two-part piston having a first piston part and a second piston part that moves separately from the first piston part during exhaust and intake strokes of the engine, the apparatus comprising:
a piston seat cover operatively associated with the first piston part, the piston seat cover being adapted for abutting engagement with the second piston part, wherein, upon abutting engagement, the piston seat cover is adapted to move relative to the first piston part thereby at least partially absorbing impact forces applied between the first piston part and the second piston part; a piston seat cup coupled to the first piston part, wherein the piston seat cover is adapted to sealably slidingly engage the piston seat cup, thereby to define a sealed piston seat cavity; a fluid ingress aperture in alignment with a cooperating piston rod passage and piston pin inlet for a portion of a combustion cycle of the engine, thereby allowing fluid to enter the piston seat cavity; and a fluid egress aperture in alignment with a cooperating piston pin passage and piston rod outlet for a portion of the combustion cycle of the engine, thereby allowing fluid to exit the piston seat cavity, wherein during a first predetermined period of operation of the combustion engine, fluid flow into the piston seat cavity is interrupted by misaligning the piston rod passage and piston pin inlet and closing the fluid ingress aperture; and wherein during a second predetermined period of operation, fluid out of the piston is interrupted by misaligning the piston pin passage and piston rod outlet and closing the egress aperture; thereby preserving a predetermined amount of fluid within the piston seat cavity volume, until fluid flow recommences.