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With the continuous development of multi-speed automatic transmission, high speed, miniaturization and high load capacity, the specifications of sliding bearings are becoming more and more strict. In addition, there has been a tendency to increase the fuel efficiency and use a low-viscosity ATF (automatic transmission fluid) to reduce the amount of lubricating oil supplied to the entire module. Therefore, it is necessary to solve problems such as improvement of the bearing resistance of the bearing, and it is required to adopt a rotary bearing design. The hub-type needle roller bearing with seal ring developed this time uses a thin-walled design with a seal ring thickness of only 0.85 mm, which reduces the thickness of the bearing section from the original 3 to 3.5 mm to 1.5 mm. By developing a thin seal ring to optimize the clearance between the rotating shaft and the seal ring, it is possible to achieve the control of the amount of oil penetration inside the bearing at the same level as the sliding bearing. In addition, the rotary bearing design is used to improve the sinter resistance and reduce the friction loss in the low rotation area.
NSK's goal is to achieve annual sales of approximately 4 billion yen in 2010 with hub-type needle roller bearings with seals for automatic transmissions. In addition, the company said that in addition to automatic transmissions, the bearings can also be used in hybrid vehicles and other industries outside the car.
NSK developed a hub needle bearing with a sealing ring
NSK has introduced a hub-type needle roller bearing with the same thickness as the automatic transmission sliding bearing. Since the thickness is the same as that of the sliding bearing, and the oil passage and oil amount control at the same level as the sliding bearing can be realized, it is possible to replace the sliding bearing.