Pumps – Condition responsive control of drive transmission or pump... – Having condition responsive pumped fluid control
Patent
1992-11-23
1993-12-28
Bertsch, Richard A.
Pumps
Condition responsive control of drive transmission or pump...
Having condition responsive pumped fluid control
417218, 4172221, 92 121, 91384, F04B 4908
Patent
active
052734030
ABSTRACT:
A control system for a variable displacement hydraulic pump with a two-lever type of feedback lever mechanism. The control system comprises a pressure responding ram for causing, upon receiving pump output pressure or outside pilot pressure, a servo spool of a servo valve to be displaced, the servo valve for causing a larger chamber of a servo cylinder to be selectively supplied with the pump output pressure, the servo cylinder for controlling angle of inclination of a swash plate of the pump in order to control the pump output flow rate, a two-lever type of feedback lever mechanism for linking the pressure responding ram, the servo spool of the servo valve and the servo piston of the servo cylinder to each other. The lever mechanism comprises a feedback lever linked at one end to the servo piston and at the other end to both the horsepower control part and the flow control part and a connection lever linked at one end to the feedback lever, hinged at the other end to a frame of the control system and linked at its predetermined middle portion to the servo spool of the servo valve. The present control system independently simultaneously controls horsepower and flow rate of the pump according to both the pump output pressure and the outside pilot pressure which are supplied to the pressure responding ram.
REFERENCES:
patent: 3510231 (1970-05-01), Bobst
patent: 3788773 (1974-01-01), Van Der Kolk
patent: 4013381 (1977-03-01), Hein et al.
patent: 4518322 (1985-05-01), Nonnemacher
patent: 4710106 (1987-12-01), Iwata et al.
patent: 4715788 (1987-12-01), Kouns et al.
patent: 5197864 (1993-03-01), Lunzman et al.
Im Lak bok
Park An Hong
Shin Jin Seop
Bertsch Richard A.
McAndrews, Jr. Roland G.
Samsung Heavy Industries Co. Ltd.
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