A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC WORK MACHINE
Disclosed is a hydraulic working machine, which has a travel speed control unit and a boost control unit and makes it possible to reduce the number of components relevant to these travel speed control unit and boost control unit. The hydraulic working machine, typically a hydraulic excavator is provided with a travel speed control unit and a boost control unit. The travel speed control unit includes a traveling, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate traveling tilt-angle control devices (21,22) that control tilt angles of travel motors (15, 16). The boost control unit includes a boosting, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate an adjustable relief valve (23) that can change a preset relief pressure. The hydraulic excavator is provided with only a single hydraulic pressure oil feed unit commonly usable as the traveling, hydraulic pressure oil feed unit and boosting, hydraulic pressure oil feed unit. This single hydraulic pressure oil feed unit is provided with lines (30,31) communicating with both of the traveling tilt-angle control devices (21,22) and the adjustable relief valve (23), a solenoidvalve (32) for opening or closing these lines (30, 31), and a controller (35) for outputting a control signal to control the solenoid valve (32).
HYDRAULIC WORK MACHINE
Disclosed is a hydraulic working machine, which has a travel speed control unit and a boost control unit and makes it possible to reduce the number of components relevant to these travel speed control unit and boost control unit. The hydraulic working machine, typically a hydraulic excavator is provided with a travel speed control unit and a boost control unit. The travel speed control unit includes a traveling, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate traveling tilt-angle control devices (21,22) that control tilt angles of travel motors (15, 16). The boost control unit includes a boosting, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate an adjustable relief valve (23) that can change a preset relief pressure. The hydraulic excavator is provided with only a single hydraulic pressure oil feed unit commonly usable as the traveling, hydraulic pressure oil feed unit and boosting, hydraulic pressure oil feed unit. This single hydraulic pressure oil feed unit is provided with lines (30,31) communicating with both of the traveling tilt-angle control devices (21,22) and the adjustable relief valve (23), a solenoidvalve (32) for opening or closing these lines (30, 31), and a controller (35) for outputting a control signal to control the solenoid valve (32).
HYDRAULIC WORK MACHINE
HYDRAULISCHE ARBEITSMASCHINE
MACHINE DE TRAVAIL HYDRAULIQUE
KARASAWA HIDEO (author) / ARIGA NOBUEI (author) / NAKAMURA TSUYOSHI (author)
2017-08-09
Patent
Electronic Resource
English