EXHAUST VALVE OPERATING MECHANISM, DIESEL ENGINE, AND METHOD FOR COOLING EXHAUST VALVE OF EXHAUST VALVE OPERATING MECHANISM

摘要

Provided are: an exhaust valve operating mechanism in which an exhaust valve is cooled to improve reliability and durability; a diesel engine; and a method for cooling the exhaust valve of an exhaust valve operating mechanism. An exhaust valve operating mechanism comprises an exhaust valve which is opened by drive force obtained by compressing hydraulic oil and transmitted from a lower valve operating mechanism to an upper valve operating mechanism (20). The exhaust valve operating mechanism further comprises: a refrigerant circulation passage (30) which is formed within the valve body of the exhaust valve and into which a part of the hydraulic oil is introduced; and an oil discharge passage which is provided extending through the housing (25) of the upper valve operating mechanism (20). During the opening and closing operation of the exhaust valve, the outlet opening of the refrigerant circulation passage (30) and the inlet opening of the oil discharge passage connect to each other to cause a part of the hydraulic oil to flow.