Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder head
Patent
1996-10-25
1997-11-04
McMahon, Marguerite
Internal-combustion engines
Particular piston and enclosing cylinder construction
Cylinder head
F02B 1700
Patent
active
056828500
ABSTRACT:
In a cylinder head for a multi-cylinder engine, which is manufactured by a casting process and which has two intake ports and two exhaust ports for each cylinder, the formation of a coolant conduit is facilitated. During the manufacture by casting, a coolant conduit is formed using a sand core so as to avoid the undersides of the intake ports. Further, a concave portion which opens to the under surface of the cylinder head is provided underneath a pair of the intake ports. And a connecting hole is formed in the cylinder head by a mechanical process so as to communicate the coolant conduit with the concave portion. In the case of a prior art type engine in which a fuel injector or the like is provided under the intake ports and the portion of the coolant conduit which passes under the intake ports is formed by using a sand core, , the sand core for this portion is easily damaged from the constructional point of view. However, according to the above described construction, it is possible to provide a coolant conduit which passes underneath the intake ports without using any sand core for the formation thereof.
REFERENCES:
patent: 4567860 (1986-02-01), Sugiyama
patent: 4658763 (1987-04-01), Gobien et al.
patent: 5207210 (1993-05-01), Yamagata et al.
patent: 5551393 (1996-09-01), Amano et al.
McMahon Marguerite
Nissan Motor Co,. Ltd.
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