Valve type air inlet two-stroke engine

Abstract

The invention provides a valve type air inlet two-stroke engine. An air inlet valve, a VVT, a roller rocker arm, a cam shaft, a hydraulic tappet, a spark plug and an oil sprayer are fixed to a cylinder cover; an intercooler is fixed in an intake manifold; an intake air filter is connected with an electronic supercharger, the electronic supercharger is connected with the intake manifold, the intake manifold is connected with a cylinder body, and an engine oil pump and a cylinder body exhaust passage are respectively fixed on the cylinder body; the lower edge of the cylinder body exhaust passage is flush with the top surface of a piston at a lower dead center position; a three-way catalyst is connected with the cylinder body exhaust passage in a pipeline form; and an intake valve, the spark plug, the oil sprayer, the piston, the cylinder cover and the surface of the cylinder body form a combustion chamber. Valve type air intake is used, a variable cam phase system is matched, a scavenging window is expanded, and scavenging efficiency is improved; a high-pressure in-cylinder direct injection system is used, the in-cylinder temperature is reduced, and the fuel oil atomization efficiency is improved; and pressure lubrication is used for replacing spray lubrication, HC emission is reduced, and emission of a four-stroke engine at the same level is realized.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a valve-type intake two-stroke engine. Background technique [0002] At present, the main form of small two-stroke engines is the crankcase scavenging type. When fuel is added and a fixed ratio of lubricating oil is mixed for spray lubrication, the combustion efficiency is low, the emission is poor, and the work is rough; the crankcase scavenging type is mainly cross-flow and backflow. Due to structural limitations, fixed scavenging phase, and low scavenging efficiency, it cannot be further applied to the environment of passenger cars with strict emissions. Contents of the invention [0003] In order to solve the above problems, the present invention provides a valve-type intake two-stroke engine, which uses valve-type intake, cooperates with a variable cam phase system, expands the scavenging window, and improves the scavenging efficiency; uses a high-pressure in-cylinder dire...

AI Technical Summary

Problems solved by technology

[0002] At present, the main form of small two-stroke engines is the crankcase scavenging type. When fuel is added and a fixed ratio of lubricating oil is mixed for spray lubrication, the combustion efficiency is low, the emission is poor, and the work is rough; the crankcase scavenging type is mainly cross-flow and backflow. Due to structural limitations, fixed scavenging phase, and low scavenging efficiency, it cannot be further applied to the environment of passenger cars with strict emissions

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