Drive device of hydraulic cylinder for working

• US 20060123672A1
• Filed: 12/27/2002
• Published: 06/15/2006
• Est. Priority Date: 12/27/2002
• Status: Active Grant

• Current Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Inventors: Satake, Hidetoshi, Ichimura, Kazuhiro, Kodaka, Katsuaki
• Granted Patent: US 7,445,240 B2
• Time in Patent Office: Days
• US Class Current: 37/348
• CPC Class Codes: E02F 9/085 Ground-engaging fitting for supporting the machines while working, e.g. outriggers, legs for vehicles in general B60S9/00, for cranes B66C23/78
• CPC Class Codes: E02F 9/22 Hydraulic or pneumatic drives for dipper or bucket arm position control E02F3/43, for blade position control for graders E02F3/844; for turntables E02F9/121; for fork-lift trucks B66F9/22
• CPC Class Codes: E02F 9/2225 using pressure-compensating valves
• CPC Class Codes: E02F 9/2228 including an electronic controller
• CPC Class Codes: E02F 9/2285 Pilot-operated systems
• CPC Class Codes: E02F 9/26 Indicating devices E02F5/145 takes precedence
• CPC Class Codes: F15B 11/003 Systems with load-holding valves
• CPC Class Codes: F15B 11/20 controlling several interacting or sequentially-operating members
• CPC Class Codes: F15B 2211/30505 Non-return valves, i.e. check valves
• CPC Class Codes: F15B 2211/6303 using input signals
• CPC Class Codes: F15B 2211/6658 Control using different modes, e.g. four-quadrant-operation, working mode and transportation mode
• CPC Class Codes: F15B 2211/7053 Double-acting output members
• CPC Class Codes: F15B 2211/7142 the output members being arranged in multiple groups
• CPC Class Codes: F15B 2211/783 Sequential control

Abstract

The present invention includes a hydraulic source (28), at least a plurality of work hydraulic cylinders (11) of a single type, that are to be driven with pressure oil from the hydraulic source (28), a control valve (22) that controls a flow of pressure oil from the hydraulic source (28) to the work hydraulic cylinders (11), an operating means for (26) issuing a command for drive of the control valve (22), a selector switch (41, 42) that selects at least an independent operation of the work hydraulic cylinders (11), and a pressure oil control means (12a, 12b, 34 to 37) for allowing the pressure oil to flow to a work hydraulic cylinder (11) selected with the selector switch (41, 42) and disallowing flow of pressure oil to other work hydraulic cylinders (11).

Claims

1. A drive device of work hydraulic cylinders, comprising:

a hydraulic source;

at least a plurality of work hydraulic cylinders of a single type, that are to be driven with pressure oil from the hydraulic source;

a control valve that controls a flow of pressure oil from the hydraulic source to the work hydraulic cylinders;

an operating device that issues a command for drive of the control valve;

a selector switch that selects at least an independent operation of the work hydraulic cylinders; and

a pressure oil control device that allows the pressure oil to flow to a work hydraulic cylinder selected with the selector switch and disallowing flow of pressure oil to other work hydraulic cylinders.

2. A drive device of work hydraulic cylinders according to claim 1, wherein:

the work hydraulic cylinders are outrigger cylinders mounted on a left side and a right side of a vehicle and the selector switch selects an independent operation of one of a left-side outrigger cylinder and a right-side outrigger cylinder or simultaneous operations of the left-side outrigger cylinder and the right-side outrigger cylinder.

3. A drive device of work hydraulic cylinders according to claim 2, wherein:

the work hydraulic cylinders are outrigger cylinders mounted also on a front side and a rear side of the vehicle, and the selector switch selects an independent operation of one of a front-side outrigger cylinder and a rear-side outrigger cylinder or simultaneous operations of the front-side outrigger cylinder and the rear-side outrigger cylinder.

4. A drive device of work hydraulic cylinders according to claim 2, wherein

all the outrigger cylinders can beset in anon-operating state with the selector switch.

5. A drive device of work hydraulic cylinders according to claim 1, further comprising:

a switching device that allows a selection of operations of the work hydraulic cylinders regardless operations of the selector switch.

6. A drive device of work hydraulic cylinders according to claim 1, further comprising:

a display device at which an operation-enabled work hydraulic cylinder is indicated.

7. A drive device of work hydraulic cylinders, comprising:

a hydraulic source;

outrigger cylinders mounted at front and rear of a vehicle on a left side and a right side, that are to be driven with pressure oil from the hydraulic source;

a control valve that controls a flow of pressure oil from the hydraulic source to the outrigger cylinders;

an operating device that issues a command for drive of the control valve;

a first selector switch that selects an independent operation of one of a left-side outrigger cylinder and a right-side outrigger cylinder or simultaneous operations of the left-side outrigger cylinder and the right-side outrigger cylinder;

a second selector switch that selects an independent operation of one of a front-side outrigger cylinder and a rear-side outrigger cylinder or simultaneous operations of the front-side outrigger cylinder and the rear-side outrigger cylinder; and

a pressure oil control device that allows the pressure oil to flow to an outrigger cylinder selected with the first selector switch and the second selector switch and disallowing flow of the pressure oil to other outrigger cylinders.