Port of internal combustion engine

Abstract

A port that communicates an inside of a combustion chamber of an internal combustion engine with an outside of the combustion chamber includes a throat portion that has at least a portion of a truncated cone shape, a valve seat portion that is connected to one end portion of the throat portion to communicate the throat portion with the inside of the combustion chamber, and a passage portion that is connected to the other end portion of the throat portion to communicate the throat portion with the outside of the combustion chamber.

1 . A port that communicates an inside of a combustion chamber of an internal combustion engine with an outside of the combustion chamber, comprising:
 a throat portion that has at least a portion of a truncated cone shape;   a valve seat portion that is connected to one end portion of the throat portion to communicate the throat portion with the inside of the combustion chamber; and   a passage portion that is connected to the other end portion of the throat portion to communicate the throat portion with the outside of the combustion chamber.   
     
     
         2 . The port according to  claim 1 , wherein the throat portion is formed by a portion formed in a truncated cone shape and a portion formed in a round columnar shape. 
     
     
         3 . The port according to  claim 1 , wherein the throat portion is formed by only a portion formed in a truncated cone shape. 
     
     
         4 . The port according to  claim 1 , wherein the valve seat portion has three or more annular surfaces in which an angle defined by any two adjacent surfaces, from among the three or more annular surfaces, is the same. 
     
     
         5 . The port according to  claim 4 , wherein a width of each of the three or more annular surfaces is the same. 
     
     
         6 . The port according to  claim 1 , wherein the valve seat portion has a plurality of annular surfaces in which a width of each of the plurality of annular surfaces is the same. 
     
     
         7 . The port according to  claim 1 , wherein the valve seat portion has four annular surfaces. 
     
     
         8 . The port according to  claim 1 , wherein the throat portion is connected to the passage portion such that a flow direction of gas that flows along a peripheral surface of the throat portion is parallel to a generating line of the truncated cone shape of the throat portion when gas passes through the throat portion. 
     
     
         9 . The port according to  claim 8 , wherein the throat portion is connected to the passage portion such that an axis of the throat portion and an axis of the passage portion are in the same plane. 
     
     
         10 . The port according to  claim 1 , wherein the throat portion is connected to the passage portion such that at least a portion of an extension line of a generating line of the truncated cone shape of the throat portion is included in a peripheral surface that includes a boundary line between the passage portion and the throat portion, and that is a peripheral surface of the passage portion.