Power plants – Pressure fluid source and motor – Apparatus having means responsive to or ameliorating the...
Patent
1995-12-13
1997-03-18
Ryznic, John E.
Power plants
Pressure fluid source and motor
Apparatus having means responsive to or ameliorating the...
60413, F16D 3102
Patent
active
056111991
ABSTRACT:
A two-stage electrohydraulic pressure control valve modulatably controls engagement of a spring applied, pressure released brake when electrical power directed thereto is suddenly lost. The control valve includes a shutdown valve mechanism between a pilot stage and a main stage to controllably reduce the fluid pressure in an accumulator storage chamber in three distinct stages. The first stage is the immediate blocking of fluid flow from the storage chamber by a flow control valve when fluid passing therethrough in one direction exceeds a predetermined flow rate. The second stage is reducing the fluid pressure in the storage chamber to a predetermined level by a relief valve when the flow control valve is in its flow blocking position. The third stage is accomplished by restricting fluid flow from the storage chamber at a predetermined flow rate through an orifice so that the main stage modulatably controls the reduction of fluid pressure in the brake chamber.
REFERENCES:
patent: 3985063 (1976-10-01), Lemon
patent: 4458791 (1984-07-01), Schneider et al.
patent: 4959957 (1990-10-01), Schmale et al.
patent: 5020322 (1991-06-01), Schwarz
patent: 5355676 (1994-10-01), Inokuchi
Caterpillar Inc.
Grant John W.
Ryznic John E.
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