Exhaust valve

Abstract

An exhaust valve includes: a shaft section; and a head section that is formed in one end of the shaft section and formed with a valve face that seats on a valve seat disposed in a cylinder head of an internal combustion engine, in which the shaft section has a shaft diameter of a constant diameter; the head section has a head diameter that is larger than the shaft diameter; and a thick shaft section that has a diameter smaller than the head diameter and larger than the shaft diameter is formed within a section between a connecting position that connects the shaft section with the head section and a position that is spaced apart from the head front surface opposite to the valve face in an axial direction by a distance that is approximately the same as the head diameter.

1 . An exhaust valve comprising:
 a shaft section; and   a head section that is formed in one end of the shaft section and formed with a valve face that seats on a valve seat disposed in a cylinder head of an internal combustion engine and a head front surface that defines a combustion chamber of the cylinder head when the valve face seats on the valve seat, wherein   the shaft section has a shaft diameter of a constant diameter;   the head section has a head diameter that is larger than the shaft diameter; and   a thick shaft section that has a diameter smaller than the head diameter and larger than the shaft diameter is formed within a section between a connecting position that connects the shaft section with the head section and a position that is spaced apart from the head front surface in an axial direction by a distance that is approximately the same as the head diameter.   
     
     
         2 . The exhaust valve according to  claim 1 , wherein a concave section that has a shaft diameter smaller than the diameter of the shaft section is formed between the thick shaft section and the head section.