| 摘要 |
PURPOSE:To reduce an amount of work consumed in a fluid pressure driving device by applying fluid pressure, pressurized by means of a pump driven by a gas pressure in a cylinder, to a pressure receiving piston of an exhaust valve opened or closed under control of fluid pressure. CONSTITUTION:An exhaust valve 40, formed in opening out type with its pressure receiving piston 41 arranged in a fluid pressure cylinder, is opened or closed by oil pressure of a valve opening oil chamber 42 and a valve closing oil chamber 43. Through control by solenoid valves 71, 72, 73, 74, a pump 54 and a pressure accumulator 55 apply oil pressure to each oil chamber 42, 43 and also let it go from each chamber 42, 43, and the exhaust valve 40 is opened or closed. Oil pressure pressurized by means of a plunger 84 driven by gas pressure in a cylinder 10 is applied to the valve closing chamber 43, which maintains the exhaust valve 40 closed when the solenoid valve 74 is closed. This method eliminates requirement for particular raise of the oil pressure in an oil pressure circuit and can reduce an amount of work consumed in a fluid pressure driving device. |
