Internal combustion engine with an exhaust gas recirculating device

Claim 1

An internal combustion engine having an intake system, an exhaust system and an exhaust gas recirculating device having an exhaust gas control valve for changing the amount of the exhaust gas recirculated from the exhaust system into the intake system in accordance with the operating condition of the engine, said engine comprising: a combustion chamber; a cylinder head positioned over one end of said chamber and having therein a bore which has an inner wall defining an intake port; an intake valve mounted in said cylinder head for reciprocal movement therein and having a valve head, said valve head having a front surface facing said combustion chamber and a rear surface located opposite said front surface; obstructing means movable in said intake port for obstructing a part of a mixture stream flowing through the valve opening of said intake valve to create the swirl motion of the mixture containing the recirculated exhaust gas therein in said combustion chamber when the amount of the recirculated exhaust gas is larger than a predetermined level, and; actuating means responsive to changes in the amount of the recirculated exhaust gas and operatively connected to said obstructing means for actuating said obstructing means to move between an operative position located near said rear surface of the valve head of the intake valve and an inoperative position where said obstructing means does not obstruct the mixture stream flowing in said intake port.