PROPORTIONAL PRESSURE CONTROL VALVE

PURPOSE:To improve operativity by housing, in an outlet pipe of a proportional pressure control valve for functioning steering in a vehicle such as a bulldozer, a switch valve for changing over directions of the steering valve interlocked with changeover of proceeding and retreating of a transmissio...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	MATSUMOTO YUZURU
Format:	Patent
Sprache:	eng
Schlagworte:	LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS MOTOR VEHICLES PERFORMING OPERATIONS TRAILERS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To improve operativity by housing, in an outlet pipe of a proportional pressure control valve for functioning steering in a vehicle such as a bulldozer, a switch valve for changing over directions of the steering valve interlocked with changeover of proceeding and retreating of a transmission. CONSTITUTION:A steering control circuit provided on a hydraulically operated vehicle functions oil of a hydraulic pump 8 to a steering valve 6 as a pilot pressure by operating a control lever 7 of a proportional pressure control valve 1 and functioning a control valve 2a or 2b. Thus discharged oil from a hydraulic pump 17 is supplied to a hydraulic motor 9 for steering and the vehicle is steered toward a specified direction. In this case, the proportional pressure control valve 1 houses a switch valve 4 to be connected to be connected to outlet tubes 3a, 3b of control valves 2a, 2b, while outlet tubes 5a, 5b of the switch valve 4 are connected to a steering valve 6. An operating mechanism 4a of the switch valve is interlocked with a proceeding/retreating changeover lever 18 of a transmission by a link 11.