Patent ID: 8833315
Filing Date: 2014-09-16
Classification: F02B

Abstract:
1. An engine comprising: a crankshaft rotatable about a crankshaft axis; a compression piston slidably received within a compression cylinder and operatively connected to the crankshaft such that the compression piston reciprocates through an intake stroke and a compression stroke during a single rotation of the crankshaft; an expansion piston slidably received within an expansion cylinder and operatively connected to the crankshaft such that the expansion piston reciprocates through an expansion stroke and an exhaust stroke during a single rotation of the crankshaft; and a crossover passage interconnecting the compression and expansion cylinders, the crossover passage including at least one valve; wherein the maximum aggregate volume of the compression cylinder and the expansion cylinder is at least 8 times greater than the volume of the crossover passage, and the combined volume of the compression cylinder, the expansion cylinder, and the crossover passage at effective top dead center is less than 4 times the volume of the crossover passage.