Compact Ported Cylinder Construction For An Opposed-Piston Engine

摘要

A compact construction for an opposed-piston engine includes a cylinder liner with longitudinally-spaced exhaust and intake ports in which the exhaust port has inner and outer edges presenting a port height that causes the exhaust port to be fully open before a piston associated with the exhaust port reaches bottom dead center during an expansion stroke and the end surface of the associated piston to be spaced outwardly of the outer edge when the piston is at bottom dead center.

主权项

1. A piston and cylinder combination for a two-stroke, opposed-piston, comprising:
a cylinder that provides a bore with a longitudinal axis, the cylinder including spaced-apart exhaust and intake ports disposed on respective sides of a central portion of the cylinder, the exhaust port having an annular configuration that is orthogonal to the longitudinal axis and that includes an inner edge and an outer edge, the inner edge and the outer edge presenting a port height therebetween; and, first and second pistons placed in opposition in the bore, the first piston disposed for controlling the exhaust port and the second piston disposed for controlling the intake port, each of the first and second pistons including a peripheral edge, an upper ring pack, and a lower ring pack, the upper ring pack and the lower ring pack presenting a separation distance therebetween, each of the first and second pistons being operable to reciprocate between top dead center (TDC) and bottom dead center (BDC) locations in the bore; wherein, when the first piston reaches its TDC location, the exhaust port is between the upper ring pack and the lower ring pack of the first piston, with the lower ring pack adjacent the outer edge of the exhaust port; and, the exhaust port is fully open before the first piston reaches its BDC location.