Valve seat structure of motorcycle engine cylinder head

Abstract

The invention relates to a valve seat structure of a motorcycle engine cylinder head. The valve seat structure comprises an intake valve seat and an exhaust valve seat which are arranged on the cylinder head, wherein an airflow passage hole of the intake valve seat axially comprises multiple hole wall sections which form different included angles with a central axis of an intake valve, so that the airflow passage hole forms a connecting structure in smooth transition from the upstream end of an intake sealing linear section to the upstream opening end of the intake valve seat; an airflow passage hole of the exhaust valve seat axially comprises multiple hole wall sections which form different included angles with a central axis of an exhaust valve, so that the airflow passage hole of the exhaust valve seat forms a connecting structure in smooth transition from the downstream end of an exhaust sealing linear section to the downstream opening end of the intake valve seat. The valve seat structure optimizes machining outlines of the intake valve seat and the exhaust valve seat, reduces the intake resistance and the exhaust resistance to the maximum extent, increases the flows of the intake valve seat and the exhaust valve seat, increases the volumetric efficiency and improves the engine power.

Description

technical field [0001] The invention relates to the field of engine gas distribution mechanisms, in particular to a valve seat structure of a cylinder head of a motorcycle engine. Background technique [0002] The engine cylinder head is a mechanism that controls and executes the engine's working process (combustion process), and thus also affects the engine's power, economy, combustion noise and harmful exhaust emissions. It can be seen that the engine cylinder head is the core technology of the entire engine. In order to describe the performance of the engine, a noun is usually used - charge coefficient. The charge coefficient of the internal combustion engine refers to the ratio of the fresh charge m actually sucked into the cylinder by the internal combustion engine per cycle and the theoretical charge msh that fills the working volume of the cylinder in the state of the intake pipe. The charge coefficient of an internal combustion engine reflects the perfection of the...

AI Technical Summary

Problems solved by technology

[0003] The sealing section of the intake and exhaust valve seats of the existing engine cylinder head and the intake and exhaust passages are respectively provided with multiple straight sections with variable angles, and the intersection between adjacent straight sections with variable angles will form a turning point. Lobes, and these turned lobes will greatly increase the resistance of the airflow in the intake port, resulting in a reduction in the amount of air passing through, which seriously affects the performance of the engine

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