Gasoline Direct Injection Engine

Abstract

A gasoline direct injection engine may include: a piston; a combustion chamber interposed between a piston head and a cylinder; an ignition plug disposed at the top of the combustion chamber; at least one intake manifold disposed at an upper wall of the combustion chamber so that it is not interfered with by the ignition plug, and guiding intake air into the combustion chamber; an intake port disposed at an end of the intake manifold; an intake valve opening and closing the intake port; and an injector interposed between the intake port and another intake port below the intake port and injecting fuel into the combustion chamber.

1 . An internal combustion engine comprising:
 a piston reciprocally moving upwardly and downwardly in a cylinder;   a combustion chamber defined between a piston head and the cylinder;   an ignition plug disposed at the top of the combustion chamber;   at least one intake manifold disposed at an upper wall of the combustion chamber so that the at least one intake manifold is not interfered with by the ignition plug, and guiding intake air into the combustion chamber;   an intake port disposed at an end of the at least one intake manifold;   an intake valve disposed at the intake port and configured to open and close the intake port; and   an injector interposed between the intake port and another intake port below the intake ports and injecting fuel into the combustion chamber.   
     
     
         2 . The internal combustion engine of  claim 1 , wherein
 a valve angle defined as an angle between a longitudinal axis of the piston passing through a lower tip of the ignition plug and a longitudinal axis of the intake valve is an acute angle;   a tumble angle defined as an angle between the longitudinal axis of the intake valve and a longitudinal axis of the intake manifold is an acute angle; and   an incidence angle defined as an angle between the longitudinal axis of the intake manifold and a horizontal line perpendicular to the longitudinal axis of the piston is an acute angle.   
     
     
         3 . The internal combustion engine of  claim 2 , wherein the valve angle is less than 30 degrees. 
     
     
         4 . The internal combustion engine of  claim 2 , wherein the tumble angle is less than 65 degrees. 
     
     
         5 . The internal combustion engine of  claim 2 , wherein the incidence angle is less than 5 degrees. 
     
     
         6 . The internal combustion engine of  claim 1 , wherein an angle between the at least one intake manifold and the injector is less than 15 degrees. 
     
     
         7 . The internal combustion engine of  claim 1 , wherein the piston includes a cavity formed on an upper surface thereof to be dented with a predetermined depth and an outer circumference of the input port is disposed overlapped with an outer circumference of the cavity. 
     
     
         8 . The internal combustion engine of  claim 7 , wherein a center of the cavity is shifted from a center of the piston toward the injector with a predetermined distance