Hydraulic system having variable displacement pumps controlled b

Details Hydraulic system having variable displacement pumps controlled b Hydraulic system having variable displacement pumps controlled b

1980-06-19

1982-06-22

Chambers, A. Michael

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60422, 60430, 60452, F15B 1306, F15B 1309

Patent

active

043355773

ABSTRACT:
The displacement controllers of a first variable displacement pump supplying fluid for hoe and travel functions of an excavator and a second pump supplying fluid for the excavator house swing function are connected to shuttle valves which operate to couple to the controllers the lesser of the power beyond fluid pressures emanating from travel function and swing function control valves. A bypass circuit is arranged to couple power beyond flow from the swing function control valve to join the flow being outputed from the first pump when the pressure of the last-named power beyond flow exceeds the lesser of that emanating from the travel control functions. Lead compensators are provided to make the controllers more responsive to circuit demands and a power limiting valve is provided for automatically connecting pressure for destroking the pumps to relieve engine load when the engine speed falls to a predetermined minimum.

REFERENCES:
patent: 2892311 (1959-06-01), Gerpen
patent: 3455210 (1969-07-01), Allen
patent: 3465519 (1969-09-01), McAlvay et al.
patent: 3718159 (1973-02-01), Tennis
patent: 3760689 (1973-09-01), Johnston
patent: 3863449 (1975-02-01), White, Jr.
patent: 4044786 (1977-08-01), Yip
patent: 4116001 (1978-09-01), Orth
patent: 4286502 (1981-09-01), Bianchetta et al.

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