Cylinder head of an internal combustion engine

Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder head

Reexamination Certificate

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C123S0650PE

Reexamination Certificate

active

06945211

ABSTRACT:
In a cylinder head of an internal combustion engine, a plug hole for mounting an ignition plug is formed along a cylinder axis and an intake port and an exhaust port are respectively formed at both sides of the plug hole while sandwiching the cylinder axis therebetween. The cylinder head further includes an intake valve which opens or closes the intake port and an exhaust valve which opens or closes the exhaust port. In such a constitution, a cross-sectional shape of a flow passage of an outlet of the exhaust port is an oval shape extending in the horizontal direction and a water drain hole of the plug hole is formed below the exhaust port.

REFERENCES:
patent: 3791482 (1974-02-01), Sykora
patent: 3945354 (1976-03-01), Johnston
patent: 4566409 (1986-01-01), Yashiro et al.
patent: 4938182 (1990-07-01), Shiozawa
patent: 5671709 (1997-09-01), Sokoloski
patent: 6513506 (2003-02-01), Ito et al.
patent: 7-259641 (1995-10-01), None
patent: 2002-213334 (2002-07-01), None

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