DRIVING CONNECTING DEVICE FOR HEAVY-ARMED CONSTRUCTION

摘要

A device for matching the operation of a travelling unit in a construction vehicle is disclosed. The device reduces the required levering force of a travelling control pedal, easily controls the rotating force of an engine, and safely changes the engine output torque in accordance with both the levering stroke of the travelling control pedal and a travelling resistance. The device has a pressure reduction valve which is synchronized with a levering motion of a travelling control pedal in order to feed pilot fluid from a pilot pump to a direction select valve. A branch line is branched from a fluid line extending between the pressure reduction valve and the direction select valve. A hydraulic cylinder is connected to the branch line and selectively receives the pilot fluid through the branch line when the travelling control pedal is levered. A connection means is connected between a throttle lever of an engine and the hydraulic cylinder and moves the throttle lever of the engine in accordance with the displacement of the hydraulic cylinder, thereby controlling the number of revolutions of the engine.