Hydraulic swing circuit

Details Hydraulic swing circuit Hydraulic swing circuit

1994-09-22

1996-03-19

Look, Edward K.

Power plants

Pressure fluid source and motor

Having means controlling or attenuating shock vibration,...

60493, 60494, 91445, F16D 3102, F15B 1108

Patent

active

054995035

ABSTRACT:
Roughness or jerkiness in a hydraulic swing circuit in an implement having a plurality of control circuits each having a work performing device (28), (30), (32) including a swing circuit having a hydraulic motor (32), which when under an aiding load may function as a pump, is avoided in a construction that includes a source (10) of hydraulic fluid under pressure and a plurality of control valves (22), (24), (26) for the circuits which are interconnected between the source (10) and the associated work performing device (28), (30), (32). The system includes a pair of hydraulic conduits (34), (36) extending from the control valve (26) for the swing circuit to the hydraulic motor (32). A pair of pilot operated, dual level pressure relief valves (56), (58) are connected oppositely across the conduits (34), (36) at a location between the control valve (26) for the swing circuit and the hydraulic motor (32). A pair of pilot operated check valves (48), (50) are provided, one in each of the conduits (34), (36) at a location between the control valve (26) for the swing circuit and the pressure relief valves (56), (58). Each of the check valves (48) and (50) is oriented in its associated conduit to allow flow from the control valve (26) for the swing circuit toward the hydraulic motor (32) but not the reverse except when receiving a pilot signal. The pilots (60), (62) of the relief valves are connected to the conduit (34), (36) whose pressure is relieved by the associated pressure relief valve (56), (58) and the pilots (52), (54) for each of the check valves (48), (50) are connected to the conduit (34), (36) in which the other check valve (48), (50) is located.

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patent: 3972537 (1976-08-01), McClelland
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patent: 5101630 (1992-04-01), Wagenseil
patent: 5191826 (1993-03-01), Brunner
patent: 5211196 (1993-05-01), Schwelm
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