A hydraulic system of the present invention includes: a double-rows phase shifting type external gear pump (100) composed of a main driving shaft (3) with a pair of driving gears (3-1, 3-2) forming a gear teeth phase difference (P_angle) in front and rear part of an internal space of a housing (1) covered by a front cover (2) and a pair of driven shafts (4, 5) arranged in double rows to be engaged with the pair of the driving gears (3-1, 3-2); a motor transmitting torque to the main driving shaft (3); a working fluid intake line (200-5) capable of sucking the working fluid into the internal space using a negative pressure of the internal space of the housing (1); and a working fluid discharge line (200-9) discharging the high-pressure working fluid inside the internal space of the housing (1) to the outside. Accordingly, the double-rows phase shifting type external gear pump is capable of autonomously reducing pulsation without additional devices in a hydraulic circuit. In addition, the hydraulic system (200) is capable of not only increasing a discharge amount of the working fluid without a decrease while having excellent pulsation reducing efficiency, but also improving safety and control performance.;COPYRIGHT KIPO 2016
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