EP 0050118 B1 19851204 - CONTROL FOR LOAD SHARING PUMPS
Title (en)
CONTROL FOR LOAD SHARING PUMPS
Publication
Application
Priority
US 8000379 W 19800407
Abstract (en)
[origin: WO8102914A1] Conditional exchanging of working fluid between plural fluid circuits (13A, 13B) having separate supply pumps (18A, 18B) is provided for without continuously bleeding fluid from the pump control pressure lines (21A, 21B). Each circuit (13A, 13B) has a pump control (19A, 19B) responsive to a control pressure, a plurality of fluid motors (14A, 15A, 16A, 14B, 15B, 16B), and a group of resolver valves (38A, 38B) which compare motor pressures and intercommunicate the pump control (19A, 19B) with the most highly pressurized motor (14A, 15A, 16A, 14B, 15B, 16B). At times when fluid from one circuit (13A, 13B) is being delivered to a motor (16A, 16B) of another circuit (13A, 13B), the pressure comparing function of the resolver group (38A, 38B) of the one circuit (13A, 13B) is extended to include the motor (16A, 16B) of the circuit (13A, 13B). Among other uses, the system (11) may be used on excavator vehicles having plural fluid motors performing a variety of different functions. Absence of a bleed in the pump control lines (21 A, 21B) conserves power and enables precise response of the pumps to demand changes.
IPC 1-7
IPC 8 full level
F15B 11/16 (2006.01); F15B 11/17 (2006.01)
CPC (source: EP)
F15B 11/17 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/30535 (2013.01); F15B 2211/329 (2013.01); F15B 2211/351 (2013.01); F15B 2211/40515 (2013.01); F15B 2211/4053 (2013.01); F15B 2211/428 (2013.01); F15B 2211/45 (2013.01); F15B 2211/6054 (2013.01); F15B 2211/6055 (2013.01); F15B 2211/6057 (2013.01); F15B 2211/6355 (2013.01); F15B 2211/65 (2013.01); F15B 2211/71 (2013.01); F15B 2211/781 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 8102914 A1 19811015; BE 887835 A 19810909; DE 3071279 D1 19860116; EP 0050118 A1 19820428; EP 0050118 A4 19820728; EP 0050118 B1 19851204; JP H0155322 B2 19891124; JP S57500386 A 19820304
DOCDB simple family (application)
US 8000379 W 19800407; BE 1010164 A 19810309; DE 3071279 T 19800407; EP 81900670 A 19800407; JP 50094981 A 19800407