Combustion chamber construction for opposed-piston engines

Abstract

An opposed-piston engine includes a ported cylinder and a pair of pistons disposed to reciprocate in the bore of the cylinder. A combustion chamber is defined by opposing shaped piston end surfaces as the pistons approach respective top dead center (TDC) locations in the bore. At the end of scavenging, the shaped end surfaces of the pistons interact with swirl to produce turbulence in the charge air motion in the combustion chamber; the additional bulk motions include tumble. Fuel is injected into the turbulent charge air motion along a major axis, of the combustion chamber.

Description

technical field [0001] The field relates to combustion chambers of internal combustion engines. In particular, the field includes opposed-piston engine configurations in which a combustion chamber is defined between end surfaces of pistons positioned opposite within the bore of a valved cylinder. More specifically, the field includes opposed-piston engines with combustion chamber configurations that produce a tumble motion within a charge of air entering the cylinder between piston end surfaces. Background technique [0002] According to FIG. 1 , the opposed engine comprises at least one cylinder 10 with a bore 12 machined or formed therein and longitudinally arranged intake and exhaust ports 14 and 16 . One or more fuel injectors 17 are fixed in injection ports (ports where the injectors are located) which open through the side surfaces of the cylinders. Two pistons 20, 22 according to the prior art are placed inside the bore 12 with their end surfaces 20e, 22e facing eac...

AI Technical Summary

Problems solved by technology

A higher velocity vector of the vortex occurs near the cylinder wall, which provides the worst case for heat loss: the hot gas has a velocity that transfers heat to the cylinder wall and reduces the thermal efficiency of the engine

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