Power plants – Pressure fluid source and motor – Condition responsive control of or by input to input pump...
Patent
1995-10-10
1997-11-04
Michalsky, Gerald A.
Power plants
Pressure fluid source and motor
Condition responsive control of or by input to input pump...
60450, 60468, 91375A, F15B 902
Patent
active
056827458
ABSTRACT:
Methods and devices for enabling simplified bootstrap hydraulic systems for use in bootstrap hydromechanical and electrohydraulic vehicular power steering systems are disclosed. A simplified bootstrap control valve is provided wherein the control valve's load circuit is not interdicted in any way. The simplified bootstrap control valve comprises a four-way control valve having input slots formed in an open-center manner, intermediate slots formed in an open-center manner, return slots formed in a closed-center manner, and a passage for picking off the pressure value present in the intermediate slots. The pressure value present in the intermediate slots is utilized for regulating pumping apparatus providing fluid to the simplified bootstrap control valve such that pressure value present in the intermediate slots is substantially maintained at a preselected value. A simplified servo motor-positive displacement pump assembly of integrated construction is also provided. The simplified servo motor-positive displacement pump assembly includes a common central housing and a quill drive.
REFERENCES:
patent: 4139021 (1979-02-01), Ailshie et al.
patent: 5249420 (1993-10-01), Phillips
patent: 5305604 (1994-04-01), Phillips
Michalsky Gerald A.
Techco Corporation
LandOfFree
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