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HYDRAULIC CIRCUIT OF HYDRAULIC WORK VEHICLE

YONEKURA KIYOSHI

A hydraulic circuit includes: a first control valve unit (101) configured to operate hydraulic cylinders (20, 21, 23) for a work unit (5), hydraulic motors (62-65) and hydraulic cylinders provided to an upper revolving superstructure (3) and a traveling unit (2); a second control valve unit (102) configured to operate a second boom cylinder (22) and a hydraulic motor (24); an attachment operation switch (45) and a second boom operation pedal (46) as an operation unit configured to operate a second boom (72) and a hydraulic work attachment (24); and a pilot pressure oil control unit (80) configured to supply pilot pressure oil to an extraction control valve (41) as a switching valve on the most downstream side in the first control valve unit (101) and an attachment control valve (42) and a second boom control valve (43), when the operation unit (45, 46, 56, 57) is operated.

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HYDRAULIC CIRCUIT OF HYDRAULIC WORK VEHICLE

YONEKURA KIYOSHI

A hydraulic circuit includes: a first control valve unit (101) configured to operate hydraulic cylinders (20, 21, 23) for a work unit (5), hydraulic motors (62-65) and hydraulic cylinders provided to an upper revolving superstructure (3) and a traveling unit (2); a second control valve unit (102) configured to operate a second boom cylinder (22) and a hydraulic motor (24); an attachment operation switch (45) and a second boom operation pedal (46) as an operation unit configured to operate a second boom (72) and a hydraulic work attachment (24); and a pilot pressure oil control unit (80) configured to supply pilot pressure oil to an extraction control valve (41) as a switching valve on the most downstream side in the first control valve unit (101) and an attachment control valve (42) and a second boom control valve (43), when the operation unit (45, 46, 56, 57) is operated.

HYDRAULIC CIRCUIT OF HYDRAULIC WORK VEHICLE

YONEKURA KIYOSHI

A hydraulic circuit includes: a first control valve unit (101) configured to operate hydraulic cylinders (20, 21, 23) for a work unit (5), hydraulic motors (62-65) and hydraulic cylinders provided to an upper revolving superstructure (3) and a traveling unit (2); a second control valve unit (102) configured to operate a second boom cylinder (22) and a hydraulic motor (24); an attachment operation switch (45) and a second boom operation pedal (46) as an operation unit configured to operate a second boom (72) and a hydraulic work attachment (24); and a pilot pressure oil control unit (80) configured to supply pilot pressure oil to an extraction control valve (41) as a switching valve on the most downstream side in the first control valve unit (101) and an attachment control valve (42) and a second boom control valve (43), when the operation unit (45, 46, 56, 57) is operated.

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Title:

HYDRAULIC CIRCUIT OF HYDRAULIC WORK VEHICLE

Additional title:

HYDRAULIKKREIS FÜR HYDRAULISCHES NUTZFAHRZEUG
CIRCUIT HYDRAULIQUE DE VÉHICULE DE TRAVAIL HYDRAULIQUE

Contributors:

YONEKURA KIYOSHI (author)

Publication date:

2017-10-04

Type of media:

Patent

Type of material:

Electronic Resource

Language:

English

Classification:

IPC: E02F Baggern , DREDGING

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