| 摘要 |
PURPOSE:To permit control of plural kinds of discharge quantity within a specific range by selectively connecting through a switching mechanism, an operation passage equipped with a variable decompression mechanism to each operation chamber into which each working surface of a spool is faced, and varying the inclination angle of a swash plate by controlling an outside operation pressure. CONSTITUTION:When the inclination angle of a swash plate 6 increases to more than necessary, a variable orifice O1 is opened, and the control pressure of the self discharge fluid is introduced into a communication passage 27 from a port 49 through a passage 25, port 48 of an operation valve apparatus 40, and the variable orifice O1, and further introduced into the back-pressure chamber 14a of a control plunger 14 through a control passage 26, and titled movement of the swash plate 6 is controlled. Since the swash plate 6 is controlled to a prescribed inclination angle by operating a desired outside operation pressure onto the second sensing spool 43, plural kinds of pump discharge amount can be controlled within a range of the discharge pressure-discharge quantity characteristic which is set in a control valve device 40. |
