Patent ID: 6367248
Filing Date: 2002-04-09
Classification: F15B,F16H

Abstract:
A hydraulic control system for an integrated drive generator having a constant speed drive variable transmission for maintaining oil pressure to the transmission during an adverse â€œgâ€  event, comprising:an oil sump; a scavenge pump for suctioning oil from said sump; a boost pump for pumping a portion of the oil from the scavenge pump to the transmission; and a spool valve disposed between said scavenge pump and said boost pump, and between a fluid return from said transmission and said scavenge pump, said spool valve operable in a first position where said portion of oil from said scavenge pump flows through said valve to said boost pump and said return flow from said transmission flows through said valve to said scavenge pump and a second position where return flow from said transmission is re-circulated through said spool valve back to said boost pump.