Patent ID: 6378481
Filing Date: 2002-04-30
Classification: F01L

Abstract:
A four-stroke internal combustion engine having a rotary-spool inlet valve positioned in a cylinder head and spaced apart from a combustion chamber that is adjacent the cylinder head, wherein the rotary-spool valve includes a valve shaft that has a shaft axis and is configured to rotate at half the speed of an engine crankshaft, the rotary spool inlet valve being supported transversely with respect to a cylinder axis of the cylinder head, a passage extends through the valve shaft and is oriented inclined with respect to the shaft axis, a channel in the cylinder head leads to the valve shaft, an opening in the cylinder head extends between the valve shaft and the combustion chamber, the passage having a lead aperture that sweeps over the opening as the valve shaft rotates, the lead aperture having an angular range (&agr;) about the shaft axis which is at least as large as an angular range (&bgr;) of the opening about the shaft axis, wherein the channel and the opening are connected by the passage only once during one full rotation of the valve shaft, a fuel-injection nozzle is positioned in the channel and has a jet axis which is aligned with the opening through an aligned passage in the valve shaft, the fuel injection nozzle being configured to emit a fuel jet directly into the opening when the opening is openly communicating with the lead aperture, and wherein the shaft axis, an axis of the passage, and the jet axis lie in one common plane, the jet axis being oriented at a first angle (&ggr;) with respect to the shaft axis and a lead aperture axis being oriented at a second angle (&dgr;) with respect to the shaft axis, the first angle (&ggr;) being larger than the second angle (&dgr;).