Posted in Opposed Piston Engine

Opposing Piston 80% Thermally Effective NASA

Opposed Piston EngineThis implies that the combustion gases never care inside what sort of engine they are in, what is significant is the initial and final pressure and temperatures that you are able to operate at. Each crank arm 35 carries a connecting rod 41 which connects to its piston by a wristpin 42. The piston 43 of the principal crankshaft P and the piston 44 of the secondary crankshaft S are essentially conventional in their constructions, excepting that the skirts of every single will be varied in length to cover selected ports during the operative cycles as will be described.

In an best arrangement, the operate cycle would be amongst these extreme 45 degree positions above described on the other hand, where the inlet and exhaust are fixed ports in the cylinder wall as heretofore described, such is not sensible and alternatively, the work cycle is established by the secondary crankshaft moving its piston 44 between 90 degrees and 270 degrees previous best dead center, although exhaust occurs when the primary piston is at its bottom dead center position as the work cycle is completed.

One more object of the invention is to supply a novel and impoved opposed piston engine obtaining the rotation of its crakshafts uniquely phased to provide, in the reciprocable movement of the piston, a shifting of the gas charge involving the pistons across the cylinders in a manner which permits the engine to be fully operative devoid of valves and camming mechanisms by the mere expedient of providing ports at chosen areas in the cylinder walls.

Because of the 90 degree lead of the secondary crankshaft, the top dead center positions of each piston, indicated as TDC, lap each other and the closest position amongst the pistons is involving these lapped positions at approximately 45 degrees past prime dead center of the secondary piston movement, and 45 degrees just before prime dead center of the primary piston movement.

Each crankshaft carries a connecting rod 41 which connects with its respective major piston 43 and secondary piston 44. In accordance with traditional twocycle engine design and style, the inlet port 45′ and exhaust port 46 operate simultaneously, at the bottom dead center position of the key piston, and with these ports being diametrically opposed.