초록 ▼

An internal combustion gasoline engine has an air intake assembly which introduces air through the cylinder head into the cylinder to generate swirl (horizontal vortex) flow (as opposed to tumble (vertical vortex) flow) for stratified charge combustion, and to generate tumble flow for homogeneous ch

An internal combustion gasoline engine has an air intake assembly which introduces air through the cylinder head into the cylinder to generate swirl (horizontal vortex) flow (as opposed to tumble (vertical vortex) flow) for stratified charge combustion, and to generate tumble flow for homogeneous charge combustion. The piston includes a cavity combustion chamber at the top surface of the piston, the cavity combustion chamber having a round shape and an increasing cross sectional area as the top of the piston is approached. During stratified charge combustion, swirl flow is smoothly guided into the cavity combustion chamber and preserved with a sufficient intensity since the cavity combustion chamber is well sealed at its whole periphery. During homogeneous charge combustion, a tumble flow is formed inside the cylinder, and fuel injection is made in the intake stroke. Fuel supplied into the cavity combustion chamber is easily washed away by the tumble stream. Valve recesses may also be provided at the top of the piston.

대표청구항 ▼

[ What is claimed is:] [1.] An internal combustion gasoline engine, comprising:a cylinder;a cylinder head at a head of the cylinder;a piston within the cylinder;a fuel injector to inject fuel in the form of gasoline directly into the cylinder;an air intake assembly to introduce air through the cylin

[ What is claimed is:] [1.] An internal combustion gasoline engine, comprising:a cylinder;a cylinder head at a head of the cylinder;a piston within the cylinder;a fuel injector to inject fuel in the form of gasoline directly into the cylinder;an air intake assembly to introduce air through the cylinder head into the cylinder to generate swirl flow for stratified charge combustion and to generate tumble flow for homogeneous charge combustion by controlling air flow into the cylinder; andan ignition plug, in the cylinder head, to ignite an air-fuel mixture in the cylinder;wherein the piston includes a cavity combustion chamber at the top surface of the piston, the cavity combustion chamber having an increasing cross sectional area as the top of the piston is approached.