Control valve system

Motors: expansible chamber type – With motive fluid valve – For double-acting motor

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Details

1375962, F15B 1108, F15B 1304

Patent

active

050464000

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a control valve system for supplying a pressure oil to hydraulic equipments such as hydraulic cylinders, hydraulic motors and the like to control the hydraulic equipment in operation.


DESCRIPTION OF THE PRIOR ART

Hitherto, it is known that, for example, as shown in FIG. 1, in a control valve system of this type that: a pressure oil discharged from a hydraulic pump 1 is supplied to a first chamber 3.sub.1 and a second chamber 3.sub.2 of a hydraulic equipment 3 through a first meter-in valve 2.sub.1 and a second meter-in valve 2.sub.2, respectively wherein the meter-in valves 2.sub.1, 2.sub.2 are two-way valves. The pressure oil which entered the first chamber 3.sub.1 and the second chamber 3.sub.2 is discharged into a tank 5 through a first meter-out valve 4.sub.1 and a second meter-out valve 4.sub.2, respectively, the meter-out valves 4.sub.1, 4.sub.2 being two-way valves. When both the first meter-in valve 2.sub.1 and the second meter-out valve 4.sub.2 are opened, the pressure oil supplied to the first chamber 3.sub.1 of the hydraulic equipment 3, while the pressure oil having entered the second chamber 3.sub.2 of the equipment 3 is discharged from the second chamber 3.sub.2 of the equipment 3 into the tank 5. When both of the second meter-in valve 2.sub.2 and the first meter-out valve 4.sub.1 are opened, the pressure oil is supplied to the second chamber 3.sub.2 of the hydraulic equipment 3, while the pressure oil having entered the first chamber 3.sub.1 of the hydraulic equipment 3 is discharged therefrom into the tank 5.
On the other hand, in a power shovel, at least six types of hydraulic equipment are employed comprising: a boom derricking cylinder, an arm hydraulic cylinder, a bucket hydraulic cylinder, a swing hydraulic motor, a left-hand traveling hydraulic motor and a right-hand traveling hydraulic motor, to which hydraulic equipment the pressure oil is supplied through four valves. As a result, the power shovel requires at least 24 valves in operation.
In the conventional control valve system described above, a valve housing 6 of the control valve system: requires four interior valves comprising the first meter-in valve 2.sub.1, the second meter-in valve 2.sub.2, the first meter-out valve 4.sub.1 and the second meter-out valve 4.sub.2, and forms therein two pump ports 7.sub.1, 7.sub.2, two tank ports 8.sub.1, 8.sub.2 and four additional ports 9.sub.1, 9.sub.2, 9.sub.3, 9.sub.4. Consequently, when the above control valve system is employed in the power shovel, for the valve housing 6 of the control valve system of the power shovel requires 24 valves, a plurality of the pump ports, a plurality of the tank ports and a plurality of additional ports, which causes the valve housing 6 to be to large. In addition, in the valve housing 6 of the control valve system, it is very cumbersome to form each of the above ports.


SUMMARY OF THE INVENTION

In view of such circumstances described above, the present invention was made. Consequently, it is an object of the present invention to provide a small-sized control valve system requiring a minimum mounting space thereof, in which system a plurality of valves are employed to control hydraulic equipment, for example such as an hydraulic cylinder, without the risk that the plurality of the valves will interfere with each other in operation.
It is another object of the present invention to provide a small-sized control valve system requiring a minimum mounting space thereof, in which system a plurality of control valves are employed to control each of a plurality of types of hydraulic equipment without and there is fear that the plurality of control valves will interfere with each other in operation.
According to a first embodiment of the present invention, the above objects of the present invention are accomplished by providing a control valve system comprising: a valve housing which is provided with a predetermined lateral width, a predetermined longitudinal width and a predetermined height, and which

REFERENCES:
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patent: 2984257 (1961-05-01), McCormick et al.
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patent: 3838710 (1974-10-01), Reip
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patent: 4480527 (1984-11-01), Lonnemo
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patent: 4794951 (1989-01-01), Ryzner
patent: 4811650 (1989-03-01), Lonnemo
patent: 4955283 (1990-09-01), Hidaka et al.
patent: 4984427 (1991-11-01), Kubomoto

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