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US 4,285,310 AGranted
Dual intake valve type internal combustion engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsMasaaki Takizawa, Noboru Matsubara, Kazuo Takahashi
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Abstract
A dual intake valve type internal combustion engine comprises a main intake valve and an auxiliary intake valve. The main intake valve is so constructed that the combustible gas mixture introduced into the combustion chamber therethrough is caused to generate a swirl motion. A variable valve lift type of auxiliary intake valve is constructed, and the valve lift of the auxiliary intake valve is varied in accordance with the changes in the engine operating conditions.
Claims6
A dual intake valve system for use in an internal combustion engine, said valve system comprising:
- (a) a main intake valve means including means for generating a swirl motion in the intake gas;
- said intake valve means being operated by a main cam having a cam profile for low speed, said main cam being synchronized with the crankshaft of the engine;
- and
- (b) an auxilliary intake valve means operated in synchronization with the crankshaft of the engine, said auxilliary intake valve means including variable valve lifter means for lifting said auxilliary intake valve means as a function of engine operating conditions and engine speed, wherein when the flow of intake gas is small, said auxilliary intake valve means does not operate and said auxilliary intake valve means is normally closed and wherein when the flow of intake gas is large, both said main intake valve means and said auxilliary intake valve means operate to permit the flow of gas simultaneously through both said main intake valve means and said auxilliary intake valve means prior to ignition.
1 more element
Dependencies are inferred from the claim text.