IDG HYDRAULIC CONTROL PRESSURE SYSTEM FOR ADVERSE ''G'' FLIGHT CONDITIONS

摘要

The present invention meets these objectives providing an IDG system that utilizes in flow series arrangement a scavenge pump (32), a spool valve (50) and a boost pump (44). When spool valve detects an interruption in the supply pressure to the boost pump due to an adverse "g" condition, it reconfigures the system to a closed loop system. In this mode, the oil returning from the CVT is re-circulated back to the boost pump instead of back to the scavenge pump. Oil lost to leakage is replenished by an oil accumulator that use the gas pressure in the IDG's casing to expel fluid from the accumulator into the recirculating flow.