FLUID SYSTEM OF A WORK VEHICLE HAVING FLUID COMBINING MEANS AND SIGNAL COMBINING MEANS

摘要

1517656 Fluid-pressure servomotor systems CATERPILLAR TRACTOR CO 29 Sept 1976 [15 March 1976] 40455/76 Heading G3P A pair of fluid circuits in each of which a pump 28 or 30 supplies a load 12, 16 or 14, 18 through a control valve 32 or 34 have their pump delivery lines 46, 48 inter-connected by a valve 40 when a significant difference in load occurs between the circuits. Pressure A from a pilot pump 22 controls the valves 32, 34 through pilot valves 36, 38 and also controls the position of the valve 40 through secondary pilot valves 62, 64 responsive through shuttle valves 106, 106 to the higher pressure produced by each of the primary control valves. The secondary pilot valves also control a valve 114 which delivers the higher of two load pressures D, E as a pressure F to servo pump controls 124, 126 also supplied by the pilot pump.