Pumps – Condition responsive control of pump drive motor – Responsive to pump or pump fluid temperature
Patent
1990-08-03
1992-04-28
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Responsive to pump or pump fluid temperature
417 38, 417 44, 303 10, 200 82C, 200 82D, F04B 4908, G01L 716
Patent
active
051082659
ABSTRACT:
The temperature-dependent pressure detection switch according to the present invention comprises a pressure receiving member to receive hydraulic pressure, on which spring force of the predetermined value is permanently applied to the direction reverse to the operating direction of said hydraulic pressure and the spring force is varied according to temperature change, and a switch unit, which is operated by the movement of said pressure receiving member against said spring force when predetermined hydraulic pressure is received. Accordingly, when ambient temperature changes, spring force is changed, and the switchover setting pressure related to the on-off switchover operation of the switch unit can be changed according to temperature change. Namely, the pressure detection switch can be provided with temperature-dependent property. By the hydraulic pressure control system using the temperature-dependent pressure switch according to this invention, it is possible to accumulate the operating fluid in the accumulator in such quantity as necessary for operating hydraulic equipment.
REFERENCES:
patent: 4608870 (1986-09-01), Huber et al.
patent: 4640555 (1987-02-01), Bertling et al.
patent: 4827093 (1989-05-01), Strzodka
patent: 4867645 (1989-09-01), Foster
patent: 4938541 (1990-07-01), Shaw et al.
Bertsch Richard A.
Jidosha Kiki Co. Ltd.
Scheuermann David W.
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