HYDRAULIC SYSTEM FOR DECREASING RESONANCE IN WHEEL LOADER

摘要

A hydraulic system for decreasing resonance in a wheel loader is provided to improve fuel efficiency and to reduce resonance by preventing a relief pressure from being applied to a main pump. A hydraulic system for decreasing resonance in a wheel loader includes a pressure sensor(42), a revolution sensor(32), a solenoid valve(23), and a controller(33). The pressure sensor measures a pressure inside a boom cylinder(41). The rotating sensor detects the number of revolutions of an engine. The solenoid valve is mounted in a load sensing passage(61) between a double check valve(22) and a regulator(12) of a main pump(11). The controller compares an input value of the pressure sensor with a predetermined pressure value of the boom cylinder. The controller also compares the number of the revolution input by the revolution sensor with the number of revolutions of an engine for driving the main pump. The controller controls the solenoid valve to open the load sensing passage.