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AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsMasaaki Noguchi, Yukiyasu Tanaka, Setsuro Sekiya, Katsuhiko Motosugi
Estimating the term…
An auxiliary combustion chamber at least partially embedded in the cylinder head of an internal combustion engine adjacent the intake valve of a main combustion chamber and having a spark plug positioned in the auxiliary chamber and unvalved inlet and outlet ports interconnecting the auxiliary chamber with the main chamber. The air/fuel mixture drawn into the main combustion chamber is deflected by the back surface of the intake valve into the inlet port of the auxiliary combustion chamber toward the spark plug. The auxiliary combustion chamber may include a shell positioned in a cavity in the cylinder head with devices for properly positioning the shell in the cavity and for retaining the shell and preventing it from rotating. A passage is provided for rich air/fuel mixture terminating at the rear surface of the valve, when closed, with refinements of the passage, shape of the inlet port, and main combustion chamber wall facilitating the flow of the rich mixture into the auxiliary combustion chamber by venturi action. The flow of fresh mixture into the auxiliary combustion chamber through suction scavenges the combustion gas remaining from the prior firing sequence.
In an internal combustion engine having a cylinder, a piston, a cylinder head associated with said cylinder and piston to define a combustion chamber, an intake passage for supplying a lean air/fuel mixture into the combustion chamber, an auxiliary passage for supplying a rich air/fuel mixture which opens in said intake passage, an intake valve for controlling the flow of the air/fuel mixture into the combustion chamber and an ignition spark plug provided in the combustion chamber, the rich air/fuel mixture supplied from said auxiliary passage being deflected by the back surface of the intake valve and thereafter supplied only into the vicinity of the electrode of the ignition spark plug whereby a stratified combustion of the rich air/fuel mixture and the lean air/fuel mixture is ensured in the combustion chamber, the improvement wherein the auxiliary passage for supplying a rich air/fuel mixture is provided in the cylinder head opening into the inner wall of the lean air/fuel mixture passage, and wherein said auxiliary passage includes an individual, straight tube communicating between the opening in said inner wall and the combustion chamber, said tube terminating at the back surface of the intake valve in the closed position of the valve.
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Pre-combustion chamber and cylinder being fed with fuel-air mixture: pre-combustion chamber having an inlet and an outlet port and with two…
With positive ignition: with fuel-air mixture admission into cylinder
Internal combustion engine [ICE] based vehicles: improving ICE efficiencies
Internal-combustion piston engines
Term ended 7 Feb 1995 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention pertains to auxiliary combustion chambers for internal combustion engines and more particularly to unvalved auxiliary combustion chambers at least partially embedded in the cylinder head.
2. Background of the Invention
Of the drawings:
FIG. 1 is a cross-sectional view of an auxiliary combustion chamber according to this invention, which is integrally cast inside the cylinder head.
FIG. 2 is a portion of the auxiliary combustion chamber of FIG. 1 including heat and corrosion resisting inserts in the unvalved inlet and outlet ports.
Reference will now be made in detail to the present preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings.
Referring now to FIGS. 1 and 2, a main combustion chamber 20 is shown in a cylinder head 22 together with an intake valve 24 for admitting a mixture of air and fuel into the combustion chamber.
In accordance with the invention, an auxiliary combustion chamber 26, having no intake valve, is integrally cast within the cylinder head 22. An inlet port 28 opens toward a stream of air/fuel mixture P admitted by the intake valve 24 and deflected toward the inlet port 28 by the back surface 30 of the valve. The inlet port 28 and an outlet port 32 interconnect the auxiliary chamber 26 with the main chamber 20. A spark plug 34 has its spark gap 36 positioned in the auxiliary combustion chamber 26.