Parts, Machinery and Tools (West Exhibition Hall)

NSK

Silent Needle Roller Bearing for Automotive Electrical Components
The ends of rollers (rolling element) in needle roller bearings used in automotive electric components are crowned (i.e. given a curved arc) to make the bearings able to withstand a heavy load. With the conventional crowing method, the roundness of the roller ends is inferior compared to the central part of the roller, resulting in loud noise from the bearing under conditions in which the roller has a large tilt. For this reason, in EVs and HEVs, in which the vehicle interior is extremely quiet, the operating noise of electric components that traditionally would not have been noticeable can disrupt the comfortableness of passengers.
NSK improved the roundness of the roller crowning by 1/4 compared to the conventional product by developing a high-precision machining method.
　The level of noise (sound pressure) generated by bearings was cut to no more than 1/3 that of the conventional product.

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