TRAVEL CONTROL SYSTEM FOR CONSTRUCTION MACHINERY

摘要

A travel control system is disclosed for preventing off-course travel of equipment due to the overloading of a working piece such as a boom during a complex operation involving vehicle travel and simultaneous driving of the working piece. The travel control system according to the present invention comprises: a left-side travel motor and first working piece coupled to a first hydraulic pump; a plurality of change-over valves for respectively controlling operating fluid supplied from the first hydraulic pump to the left-side travel motor and first working piece; a right-side travel motor and second working piece coupled to a second hydraulic pump; a plurality of change-over valves for controlling operating fluid supplied from the second hydraulic pump to the right-side travel motor and second working piece; a straight-ahead travel valve for supplying the operating fluid of the first hydraulic pump to the left-side and right-side travel motors and supplying the operating fluid of the second hydraulic pump to the first and second working pieces; and a control valve for blocking the supply of operating fluid from the second hydraulic pump, via the straight-ahead travel valve, to the left-side travel motor and right-side travel motor during complex operation involving travel and the working piece.