NSK Bearings Investor Relations Department said Japan's latest news, Japan's Seiko (NSK) has developed for the automatic transmission (AT) needle roller bearings used in life, in the harsh lubrication environment, there are long-life gaskets. In the realization of small lightweight, but also adapted to reduce the viscosity of lubricating oil, lubrication environment tends to be harsh conditions. In order to improve fuel efficiency, reduce speed vibration and improve power transmission efficiency, the use of multi-level AT is increasing. Multi-level AT In order to reduce stirring resistance, improve transmission efficiency, the use of low viscosity oil. The low viscosity, then between the roller and the gasket is difficult to form a film. In this way, the roller slides and makes metal contact with the washer, causing the washer to break quickly. In addition, the hybrid electric vehicle (HEV) in the motor only, the pump sometimes does not run, resulting in the transmission with thrust needle roller bearings in low oil environment, which will damage the gasket. NSK manufactures gaskets using the independently developed steel "PCR5", which increases toughness by increasing Cr (chromium) content by reducing C (carbon) and Si (silicon) contents. PCR5 excellent stamping process, the thickness of more than 2.5mm can be stamping process. By giving full play to this feature, the gasket is thicker than previous products. Thickness increases to increase rigidity, roller and washer to achieve equal contact, which can make the life expectancy. And further carbonized PCR-nitrided steel to improve the toughness, surface hardness and fatigue resistance. As a result of the above measures, the life span of the washer was prolonged by more than 3 times as compared with that of the "SK85" steel that had been subjected to normal heat treatment instead of carbonitriding treatment at a load of 6400 N (Pmax = 5.0 GPa) and a rotation speed of 1000 rpm. In addition than the original reduced by 20%.
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