The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 1997
Filed:
Oct. 25, 1996
Yutaka Matayoshi, Yokosuka, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
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.