Water jacket structure of cylinder head

Abstract

The invention provides a water jacket structure for a cylinder head, and can realize improvement of cooling efficiency of a collector and suppress retention of gas and air during casting. The water jacket structure for the cylinder head has a plurality of upper combustion chamber portions (21), a plurality of exhaust openings (23), a collector (24) collecting the plurality of exhaust openings, and an upper outlet water jacket (80) and a lower outlet water jacket (90) which are respectively arranged at upper and lower sides relative to the collector. Mutually independent flow channels are formed in the upper outlet water jacket (80) and the lower outlet water jacket (90). The lower outlet water jacket (80) has a protruding portion (81), and the lower outlet water jacket has a protruding portion (91). The protruding portions (81, 91) are spaced from each other at a predetermined interval in a cylinder axis direction, and the protruding quantity L1 of the protruding portion (81) is smaller than the protruding quantity L2 of the protruding portion (91).

Description

technical field [0001] The present invention relates to a water jacket structure of a cylinder head, and in particular, relates to a water jacket structure of a cylinder head integrally formed with an exhaust gas collecting portion for collecting a plurality of exhaust ports. Background technique [0002] As a cylinder head, there is known a cylinder head integrally formed with an exhaust gas collecting portion for collecting a plurality of exhaust ports extending from a plurality of combustion chambers. In such a cylinder head, in order to sufficiently cool the exhaust manifold that tends to become high temperature, in addition to the combustion chamber water jacket for cooling the combustion chamber, an exhaust water jacket for cooling the exhaust port and the exhaust manifold is provided. [0003] For example, Patent Document 1 discloses a cylinder head water jacket structure in which exhaust water jackets are respectively provided on the upper side and the lower side of ...

AI Technical Summary

Problems solved by technology

It is known that in such a casting method, the heat of the molten metal poured into the cavity of the mold burns the resin binder forming the core to generate gas, and if the gas is mixed into the molten metal and contained in the cast product , will cause casting defects

In addition, it is known that if the air present in the cavity before pouring is mixed into the molten metal and contained in the casting, it will cause casting defects

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