Method for processing gas port of engine cylinder cover

Abstract

The invention relates to a machine processing method, in particular to a processing method of an engine cylinder cover airflow passage port. A cylinder cover with a airflow passage is processed and formed by the invention firstly; a valve seat is then assembled on the cylinder cover; an airflow passage throat is precisely processed by a cutting tool and the radius of gyration of the cutting track line is equal to the internal diameter at the opening at the top end of the valve seat, thus forming a smooth transition between the airflow passage throat and the opening at the top end of the valve seat. The invention avoids the disadvantageous problems of opening shrinkage, opening enlargement and dislocation, etc., at the communication location between the airflow passage throat and the opening at the top end of the valve seat, reduces the airflow resistance, leads the airflow to smoothly pass, does not affect the air inlet organization or air inlet quantity, thus ensuring the normal operation of the engine.

Description

technical field [0001] The invention relates to a mechanical processing method, in particular to a processing method for an engine cylinder head air passage opening. Background technique [0002] The air port of the cylinder head of the existing engine is formed by casting simultaneously with the cylinder head. The cylinder head air port formed by this kind of casting usually has the following three defects: one is that the opening at the top of the valve seat forms a shrinkage along the intake direction; The third is the dislocation between the airway throat and the opening at the top of the valve seat, as shown in Figures 1, 2, and 3 respectively. If not dealt with, the above-mentioned constriction will inevitably affect the airflow organization and intake efficiency; the flaring will lead to insufficient air intake of the engine; and the dislocation will not only affect the organization of airflow, but also affect the intake air of the engine quantity. Contents of the...

AI Technical Summary

Problems solved by technology

The cylinder head air port formed by this kind of casting usually has the following three defects: one is that the opening at the top of the valve seat forms a shrinkage along the intake direction; The third is the dislocation between the airway throat and the opening at the top of the valve seat, as shown in Figures 1, 2, and 3 respectively

If not dealt with, the above-mentioned constriction will inevitably affect the airflow organization and intake efficiency; the flaring will lead to insufficient air intake of the engine; and the dislocation will not only affect the organization of airflow, but also affect the intake air of the engine quantity

Images