| 摘要 |
<p>A two-cycle, gas-powered engine which is capable of operating over a wide range of loads including those (e.g. idle speed) which have previously caused misfirings in known engines of this type. A specially constructed head and piston assembly and a governor-controlled fuel system are incorporated into an otherwise typical two-cycle engine to convert the engine into a stratified charge engine. The head and piston assembly is constructed to provide an ovate-domed, flatbottomed combustion chamber (20) therebetween when the piston (15) is in a top dead center position in the cylinder (12). This combustion chamber (20) allows fuel injected in the top of the combustion chamber to mix with air being compressed by the piston (15) to provide a rich stratified charge around the ignition means (32) (e.g. spark plugs) which are also positioned near the top of the chamber. This charge is always rich enough to support rapid ignition and to quickly spread burning to the weaker, exhaust-contaminated mixture present in the lower combustion chamber. Further a squish area (30) is defined by tapered surfaces (21, 28) on the head and on the piston which has the effect of reducing or breaking the swirl of the weaker mixture in the lower section of the combustion chamber while increasing the swirl (i.e. turbulence) of the stratified charge in the upper section, thereby aiding in maintaining the stratified charge in the uppermost portion of the chamber to insure ignition.</p> |
