| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a two stroke crosshead engine in which operation of a hydraulic pressure supply device is simple and reliable and does not consume ineffective high energy, and in which a pump drive body and a valve actuator are operated by system oil. <P>SOLUTION: The two stroke crosshead engine is provided with multiple fuel pumps 13 and multiple exhaust valves 4. The fuel pumps are hydraulically driven piston pumps, and a pump drive body 14 thereof opens the exhaust valve by a hydraulic actuator 7 supplied with pressurized hydraulic fluid. The hydraulic device includes single high pressure supply channel 5. When engine load changes, the high-pressure supply channel supplies hydraulic fluid to the pump drive body 14 and the actuator 7 of the exhaust valve irrespective of substantial difference of required pressure of two types of hydraulic devices. System oil of the engine is used as hydraulic fluid, and hydraulic fluid discharged from the pump drive body 14 and the valve actuator 7 is returned to an oil reservoir of the engine. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
