Development of Variable Discharge Oil Pump

In the development of automotive engines, reduction of fuel economy is one of very important issues. We focused on reduction in oil pump friction which accounts for 10% of engine friction to enhance fuel economy. As a result, oil pressure was reduced at excessive areas by variable discharge by maintaining required oil pressure for the engine. By that we have succeeded in developing a variable discharge oil pump which can reduce friction by 33% at frequently-used engine speed range.