CYLINDER HEAD AND INTERNAL COMBUSTION ENGINE

摘要

A cylinder head with which exhaust manifolds are integrated includes a secondary air supply passage configured to include: a main passage disposed above combustion chambers of an engine, and extending along a cylinder line direction; and plural branch passages establishing individual communications between the main passage and corresponding exhaust ports. The respective plural branch passages are so disposed as to be inclined downward from the main passage toward the exhaust ports. Accordingly, it is possible to prevent corrosion of the cylinder head due to stagnation of condensed water.

主权项

1. A cylinder head for an internal combustion engine installed in a vehicle,
the internal combustion engine including plural cylinders and an exhaust system, the cylinder head comprising: plural exhaust ports communicating with the corresponding plural cylinders; port assemblies at which downstream parts of the plural exhaust ports in an exhaust flow direction are connected; and a secondary air supply passage that supplies a secondary air to the exhaust system, the secondary air supply passage being located more upward than combustion chambers of the internal combustion engine in a state that the internal combustion engine is installed in the vehicle, the secondary air supply passage including
a main passage extending along a cylinder arrangement direction, andplural branch passages establishing individual communications between the main passage and the corresponding exhaust ports,the respective plural branch passages being disposed such as to be inclined downward from the main passage toward the corresponding exhaust ports in the state that the internal combustion engine is installed in the vehicle, andthe port assemblies being integral with the cylinder head, the port assemblies being opened in an outer wall surface of the cylinder head.