Prechamber gas-combustion engine

摘要

A prechamber gas-combustion engine is disclosed in which no residual unburned gaseous fuel is left in auxiliary chambers(2) to ensure the thermal efficiency. The control valves(5) are each arranged in connecting ports(6) between main and auxiliary chambers(1,2) and extend through an axial central area of the associated auxiliary formed in an inverted frustum of cone. The control valves(5) each have an air passage(7) opened to the main chamber(1) and air-discharge orifices(16) to be opened to an upper area in the auxiliary chamber(2). Arranged in the air passage(7) is a slide valve(8) to open the air-discharge orifices(16) to upper area of the auxiliary chamber(2) when subjected to an air pressure above a preselected pressure in the main chamber(1). The control valve(5) opens the air-discharge orifices(16) late in the compression stroke, so that the compressed air is allowed to issue into the upper area in the auxiliary chamber(2). The compressed air flows against the conical surface(21) in the auxiliary chamber(2), then reflects upwards, filling the auxiliary chamber(2) from above thereby pressing down the gaseous fuel to the lower area in the auxiliary chamber(2), where combustion takes place. <IMAGE>