Torch ignition type internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsMasafumi Yamazaki, Yasuhiko Nakagawa
Life of this patent
Estimating the term…
Abstract
A torch ignition type internal combustion engine has therein a main combustion chamber and an auxiliary combustion chamber which chambers are individually communicable with a common carburetor through a main intake valve and an auxiliary intake valve, respectively. The opening timing of the auxiliary intake valve is so controlled to be later than that of the main intake valve.
Claims9
A torch ignition type internal combustion engine having fluidly communicated main and auxiliary combustion chambers for each of the engine cylinders, said main and auxiliary combustion chambers being respectively provided with main and auxiliary intake valves, said engine comprising:
- a carburetor having a throttle valve;
- a cylinder head having therein main and auxiliary intake ports which are respectively and fluidly communicable with said main and auxiliary combustion chambers through the respective main and auxiliary intake valves;
- an intake manifold consisting of a main tube portion fluidly communicating with said carburetor downstream of said throttle valve, main runner portions branched from said main tube portion and formed with main passageways communicating upstream with said main tube portion and dowstream with said main intake ports respectively, and auxiliary runner portions formed with auxiliary passageways each providing fluid communication between each of the auxiliary combustion chambers and said main tube portion through an opening formed in said main tube portion;
- and
- valve actuating means for allowing each of said main intake valves to open earlier than the corresponding auxiliary intake valve during the engine operation.
Method for operating a torch type internal combustion engine including main and auxiliary combustion chambers for each of the engine cylinders, said main and auxiliary combustion chambers being respectively provided with main and auxiliary intake valves, a carburetor having a throttle valve, a cylinder head having therein main and auxiliary intake ports which are respectively and fluidly communicable with said main and auxiliary combustion chambers through the respective main and auxiliary intake valves, an intake manifold consisting of a main tube portion fluidly communicating with said carburetor downstream of said throttle valve, main runner portions branched from said main tube portion and formed with main passageways communicating upstream said main tube portion and downstream with said main intake ports respectively, and auxiliary runner portions formed with auxiliary passageways each providing fluid communication between each of the auxiliary combustion chambers and said main tube portion through an opening formed in a portion in said main tube portion, characterized in the step of opening said main intake valve before opening of said auxiliary intake valve.
Dependencies are inferred from the claim text.