Patent ID: 8826870
Filing Date: 2014-09-09
Classification: F01L,F01P,F02B,Y10T

Abstract:
1. A two-stroke engine comprising: a crankshaft rotatable about an axis; an engine block including a combustion cylinder and a compression cylinder; a first piston slidably disposed within said combustion cylinder and operatively coupled to said crankshaft for reciprocating movement within said combustion cylinder through a power stroke during each rotation of said crankshaft about said axis; a second piston slidably disposed within said compression cylinder and operatively coupled to said crankshaft for reciprocating movement within said compression cylinder such that fresh air is received and compressed in said compression cylinder during each rotation of said crankshaft about said axis; a conduit providing fluid communication between said combustion cylinder and said compression cylinder; a fuel injector in communication with said combustion cylinder for admitting fuel into said combustion cylinder; first and second rotary valves in said engine block and operatively coupled to said crankshaft for rotation relative to said crankshaft, said first and second rotary valves being respectively rotatable to selectively admit fresh air into said compression cylinder and to permit the flow of compressed air into said conduit; said first and second rotary valves operable such that air compressed in said compression cylinder is transferred through said conduit to said combustion cylinder and scavenges substantially all contents of said combustion cylinder before fuel is admitted to said combustion cylinder by said fuel injector; wherein said conduit defines a first volume for holding air and said combustion cylinder defines a first maximum volume for holding a mixture of air and fuel, said first volume of said conduit being larger than said first maximum volume of said combustion cylinder for scavenging substantially all contents of said combustion cylinder plus an additional volume of clean air.