Patent ID: 7357117

Claim:
A structured combustion chamber for an engine, comprising: a cylinder head including an intake hole portion which makes a communication between an intake port and a combustion chamber and an exhaust hole portion which makes a communication between an exhaust port and said combustion chamber; an intake valve for opening and closing said intake hole portion; a continuous variable valve lift mechanism for lifting said intake valve in a stepless fashion; and a flow promoting device made to promote a motion of an air current in said combustion chamber when a quantity of lift of said intake valve driven by said continuous variable valve lift mechanism is small and made to suppress a decrease in flow rate of an intake air coming through said intake hole portion into said combustion chamber when the quantity of lift of said intake valve driven by said continuous variable valve lift mechanism reaches a maximum, wherein said flow promoting device is made as a projection extending along only a portion of an outer edge of said intake hole portion and protruded toward said combustion chamber, with said portion of said outer edge of said intake hole portion being positioned on the opposite side from said exhaust hole portion.