Power plants – Pressure fluid source and motor – Manual pump pressurizes fluid to position output motor...
Patent
1996-01-19
1997-11-04
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Manual pump pressurizes fluid to position output motor...
60469, 1376253, 13762569, F16D 3102
Patent
active
056827440
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a directional control valve for delivering a pressurized discharge fluid of a hydraulic pump into a steering control cylinder in a full hydraulic type steering control system.
BACKGROUND ART
A full hydraulic type steering control system known in the prior art is shown in FIG. 1 of the accompanying drawings.
More specifically, in the prior art full hydraulic type steering control system is provided with a directional control valve 3 for selectively delivering a pressurized discharge fluid of a hydraulic pump 1 into the respective fluid chambers 2a and 2b of a pair of steering control cylinders 2, a steering control valve 6 for selectively delivering the pressurized discharge fluid of the above-mentioned hydraulic pump 1 into first and second pressure receiving portions 4 and 5 of the directional control valve 3 to switch over the directional control valve 3, a steering wheel 7 for switching the above-mentioned steering control valve 6, a combining valve 8 for combining the pressurized discharge fluid of the hydraulic pump 1 and a pressurized fluid from the steering control valve 6 together for delivery into the directional control valve 3, and an opening and closing valve 9.
In the above-mentioned full hydraulic type steering control system, steering the steering wheel 7 will cause the pressurized discharge fluid of the hydraulic pump 1 to be delivered into a first port 11 or a second port 12 of the steering control valve 6 and the pressurized fluid to be delivered into the first or second pressure receiving portion 4 or 5 of the directional control valve 3 to switch the directional control valve 3 from its neutral position A to its first position B or to its second position C. This will, in turn, cause the combining valve 8 to be switched from its blocking position D to its communicating position E, and further the opening and closing valve 9 to be switched from its closing position F to its opening position G. The pressurized discharge fluid of the above-mentioned hydraulic pump 1 will thus flow via the combining valve 8 and the opening and closing valve 9 again into the combining valve 8 for merging with the pressurized fluid delivered from the steering control valve 6 and will then be delivered via the directional control valve 3 into the respective fluid chambers 2a or 2b of the two steering control cylinders 2. A pressurized fluid in each of the fluid chambers 2b and 2a will be allowed to flow via the directional control valve 3 and a drain passage 13 into a reservoir. The steering control cylinder 2 will thus be expandingly or contractively operated to steer the vehicle wheels (not shown) leftward or rightward. If the steering wheel 7 is halted at an optional position thereafter, the steering control valve 6 will be rendered incapable of outputting the pressurized fluid, thus restoring the directional control valve 3 to its neutral position A under the action of a pair of springs 14. As a result, the pressurized fluid 3 will no longer flow into the steering control cylinder 2, thereby keeping a pressure as it is within the fluid chamber 2a or 2b of the steering control cylinder 2.
The above being the case, the steering control cylinders 2 will be expandingly or contractively operated with their stroke length being proportional to an amount of steering at the steering wheel 7 to determine the angle of steering. It will also enable a flow of fluid that is greater than a flow of fluid delivered from the steering valve 6 to be delivered into the steering cylinders 2. More specifically, being called the Orbit Roll (trade name), the steering valve 6 is a valve having a metering function for outputting a flow of fluid that is commensurate with an amount of steering at the steering wheel 7. Since the steering control valve 6 is configured structurally so as to be unable to output a large flow of fluid, its output pressurized fluid is designed to be converted to establish a pilot pressure fluid such that the directional control valve 3 may be switched so as
REFERENCES:
patent: 3556155 (1971-01-01), McWilliams et al.
patent: 4161865 (1979-07-01), Day
patent: 4232584 (1980-11-01), Fassbender
patent: 4311006 (1982-01-01), Becker
patent: 4640094 (1987-02-01), Wittren
Hasegawa Nobuki
Sugano Yukio
Kananen Ronald P.
Komatsu Ltd.
Lopez F. Daniel
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