Hydraulic logic control for variable displacement pump

Details Hydraulic logic control for variable displacement pump Hydraulic logic control for variable displacement pump

1980-05-27

1983-05-10

Pekar, John A.

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

60428, 60450, 417216, B60K 1710

Patent

active

043824854

ABSTRACT:
A variable speed engine (10) drives a tractive effort drive train (12) and fixed and variable displacement pumps, (14 and 16) arranged to supply fluid pressure to a hydraulic work system (24). The displacement of the variable pump (16) is determined by a control ram (42) and a conduit (44, 53, 74) interconnects the variable pump output and the control ram (42). An engine speed control valve (60) and a system pressure compensator valve (46) interposed in series in said conduit (44, 53, 74). The two valves (60 and 46) maintain the variable pump (16) at full output except when low engine speed and high system pressure exists simultaneously.

REFERENCES:
patent: 3962870 (1976-06-01), Lech
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4203712 (1980-05-01), Uehara

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