Rotary valve with facility for stratified combustion in the internal combustion engine

摘要

A coaxial rotary valve mechanism for an internal combustion engine that incorporates two coaxial, cylinder shaped rotors in the cylinder head, rotating with speed ratio of 2:1 so that ports in their surfaces align at the appropriate segments of the operating cycle to function as air intake valves. The outer rotor further comprises a recess on its surface which has plurality of functions. During the compression stroke said recess forms a pre-combustion chamber between said rotor and the cylinder head, and during the exhaust stroke brings the cylinder into the open registry with the exhaust port allowing combustion gases to be exhausted. During the compression stroke the liquid fuel is injected into the pre-combustion chamber containing exhaust gases, while said pre-combustion chamber is in closed registry with the cylinder. The air inlet is restricted during the injection and as the outer rotor progresses with its rotation a swirl of compressed air is allowed into the pre-combustion chamber only prior to the ignition. Stratified combustion of the fuel charge has two stages. In firs stage, part combustion takes place in the pre-combustion chamber, where burning mixture increases the pressure, which in the second stage injects unburned portion of the charge into the main-chamber, containing compressed air only, for total combustion. The stratified combustion lowers the combustion temperature which in return reduces the content of major pollutants in the exhaust gases.