Internal combustion engine cylinder head
AssigneeNissan Motor Co., Ltd.
InventorsYutaka Matayoshi, Shigeru Kamegaya, Shigeo Muranaka
Life of this patent
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Abstract
A cylinder head of a DOHC internal combustion engine has intake and exhaust ports of a siamese shape. A pivot for a rocker arm of the end pivot type is installed in a pivot installation hole which is formed at a nearer point from each cylinder than the branched point of each of the intake and exhaust ports. With this arrangement, since the pivot installation hole can have a sufficient depth without deforming the shape of the intake port, each swinging end of the rocker arm for intake valves and that for the exhaust valves can be disposed opposite to each other. Therefore, the engine is improved with respect to its performances and size.
Claims7
A cylinder head of an internal combustion engine, comprising:
- two engine valves which are provided for each cylinder of the engine;
- a rocker arm which contacts top ends of said engine valves at a first end of said rocker arm;
- a pivot which contacts a second end of said rocker arm so as to swingingly support said rocker arm;
- means for defining in said cylinder head a gas port through which gas passes said gas port having a first passage section which is opened to outside of said cylinder head, and second and third passage sections which are connected with said first passage section and communicable to said cylinder, said second and third passage sections being separate from each other;
- and
- means for defining a pivot installation hole which is formed between the second and third passage sections of the gas port, said pivot installation hole receiving said first pivot therein.
Dependencies are inferred from the claim text.