Abstract
Metaldyne´s new "Energy-Efficient" Balance Shaft / Oil Pump Module (hereafter "BS/OPM") combines several innovations to cost-effectively solve technical challenges, and thus provide competitive advantage in the marketplace. Used in the Hyundai 2.0L/2.4L Sonata since 2004, the BS/OPM´s patent-protected engineering design technology helps this new engine family establish new competitive benchmarks. New-to-marketplace advances in low-speed oil flow capacity, concurrent with best-in-class high-speed power consumption levels, are possible by means of a jet pump to efficiently recycle unused engine oil at high speeds.
The physics-based advantages of a two-stage drive ratio step-up, the synergistic use of oil pump drag torque, and a balance shaft operating shape control strategy all help minimize drive system noise emissions, thereby avoiding the need for expensive manufacturing methods. Oil system noise emissions are minimized by dividing work between two gerotor pumps, and by the avoidance of cavitation at high speeds by means of jet pump pressurization. Contribution to oil aeration is minimized by a blower-like air/oil scavenging system.
Keywords:Balance, Shaft, Oil, Pump, NVH