ENGINE WITH VALVE SUSPENDING FUNCTION

摘要

PROBLEM TO BE SOLVED: To surely prevent the staying fuel from flowing into a combustion chamber at the time of switching a suspended intake valve to the opening and closing operation by forming, in a cylinder head, a communicating passage allowing intake passages corresponding to an intake valve openable and closable even in a specified operating and an intake valve suspended in the specified operating area to communicate each other. SOLUTION: A valve suspending mechanism is laid into non-operating state in a specified operating area in an engine, for example, low-speed operating area, so that one intake valve is suspended, and the other intake valve is opened and closed. In this case, a communicating passage 109 allowing respective intake passages 461, 462 corresponding to the suspending intake valve and the regularly opening and closing intake valve to communicate each other is formed in a cylinder head 40. When the suspending intake valve is suspended, the air-fuel mixture 110 in the intake passage 46 corresponding thereto is passed to the intake passage 462 of the regularly opening and closing intake valve through the communicating passage 109. According to this, when the suspending intake valve is switched to open and close, the fuel staying in the intake passage 461 corresponding thereto can be prevented from flowing into a combustion chamber 43.