Patent ID: 8671922
Filing Date: 2014-03-18
Classification: F01B,F01L,F02B

Abstract:
1. An engine comprising: an engine casing; a first piston configured to reciprocate relative to the engine casing, the first piston having a wall that defines a substantially cylindrical chamber; one or more second pistons configured to reciprocate inside the substantially cylindrical chamber; a combustion chamber intake port and a combustion chamber exhaust port, each of which extends through the wall; a shutter outside the wall and movable between a first position substantially blocking fluid flow through the combustion chamber exhaust port but not blocking fluid flow through the combustion chamber intake port and a second position substantially blocking fluid flow through the combustion chamber intake port but not blocking flow through the combustion chamber exhaust port, wherein the shutter is curved to substantially conform to an outer surface of the wall; and an actuator that causes the shutter to move between the first position and the second position in response to the first piston reciprocating relative to the engine casing.