Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1982-09-27
1985-01-29
Look, Edward K.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
F04B 4900
Patent
active
044962908
ABSTRACT:
A control system for maintaining the product of the lifting pressure and lifting volume times flow constant in an adjustable pump having a regulating member acted upon by two pressure-controlled pistons. The device includes a control valve which is operatively connected with a spring with a linear characteristic, which spring is through the control valve operatively connected to an adjusting lever having an arm which is varied proportionally to the working pressure of the pump. The moment is produced by the force of that spring and that variable lever arm. A counter moment is generated by a force of a second spring and a second arm of the adjusting lever. Upon creating the force equilibrium on the adjusting lever the control valve is so controlled that the product of the pumping pressure and pumping volume times flow remains constant. The control valve controls one of the two pressure-controlled pistons which adjusts the stroke of the regulating member.
REFERENCES:
patent: 4081223 (1978-03-01), Fricke et al.
patent: 4273517 (1981-06-01), Heyl
patent: 4370100 (1983-01-01), Forster et al.
Look Edward K.
Robert & Bosch GmbH
Striker Michael J.
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