Device for controlling a hydraulic motor

Details Device for controlling a hydraulic motor Device for controlling a hydraulic motor

1994-06-10

1995-11-28

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Unsafeness, unreadiness or disarray prevent manual change or...

60452, 91448, F16D 3102

Patent

active

054697034

ABSTRACT:
A device for controlling a hydraulic motor (10) comprises a directional valve (15) connected to a pressure fluid pump (11; 50) via a feed passage (17) and a pilot valve (19) activated safety shut-off valve (18) incorporated in the pressure fluid feed passage (17) between the pump (11; 50) and the directional valve (15) and shiftable from a normally open position to a closed position to, thereby, block the fluid communication between the pump (11; 50) and the directional valve (15) in emergency situations. A shunt valve (16) for short circuiting at least a part of the pump flow to a tank or, alternatively a displacement adjusting means (51) of a variable displacement pump (50) are activated by a load sensing pressure derived from a load sensing port (15e) on the directional valve (15), which load sensing pressure is discharged to tank (12) via the shut-off valve (18) as the latter is shifted to its closed position.

REFERENCES:
patent: 4617854 (1986-10-01), Kropp
patent: 5062266 (1991-11-01), Yoshimatsu
patent: 5152140 (1992-10-01), Hirata et al.

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