Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
HYDRAULIC CIRCUIT AND WORKING MACHINE
Provided is a hydraulic circuit in which efficiency of confluence and distribution of each pump flow rate for various operations of each control valve is improved. The hydraulic circuit includes control valves (CV1) to (CV4) configured at least to control the direction of hydraulic oil respectively supplied to each cylinder (21c) to (23c) and a hydraulic swing motor (16m). The hydraulic circuit includes, at the upstream side of a bucket control valve (CV2), a second pressure compensating valve (CO2) which maintains fore and aft pressure difference at an opening from pumps (P1) to (P3) of the bucket control valve (CV2) to the bucket cylinder (23c) constant. The Hydraulic circuit includes a selector valve (29) configured to control the direction of hydraulic oil discharged from a third pump (P3) so as to selectively supply the hydraulic oil to any of the bucket cylinder (23c), the stick cylinder (22c), or the hydraulic swing motor (16m). When switching the selector valve (29) according to the degree of operation of at least one of the control valves (CV1) to (CV4), the hydraulic oil supplied to the bucket cylinder (23c) is made confluent between the bucket control valve (CV2) and the second pressure compensating valve (CO2).
HYDRAULIC CIRCUIT AND WORKING MACHINE
Provided is a hydraulic circuit in which efficiency of confluence and distribution of each pump flow rate for various operations of each control valve is improved. The hydraulic circuit includes control valves (CV1) to (CV4) configured at least to control the direction of hydraulic oil respectively supplied to each cylinder (21c) to (23c) and a hydraulic swing motor (16m). The hydraulic circuit includes, at the upstream side of a bucket control valve (CV2), a second pressure compensating valve (CO2) which maintains fore and aft pressure difference at an opening from pumps (P1) to (P3) of the bucket control valve (CV2) to the bucket cylinder (23c) constant. The Hydraulic circuit includes a selector valve (29) configured to control the direction of hydraulic oil discharged from a third pump (P3) so as to selectively supply the hydraulic oil to any of the bucket cylinder (23c), the stick cylinder (22c), or the hydraulic swing motor (16m). When switching the selector valve (29) according to the degree of operation of at least one of the control valves (CV1) to (CV4), the hydraulic oil supplied to the bucket cylinder (23c) is made confluent between the bucket control valve (CV2) and the second pressure compensating valve (CO2).
HYDRAULIC CIRCUIT AND WORKING MACHINE
HYDRAULIKKREIS UND ARBEITSMASCHINE
CIRCUIT HYDRAULIQUE ET ENGIN DE CHANTIER
NAKAJIMA HIDEKI (Autor:in)
15.05.2019
Patent
Elektronische Ressource
Englisch