Nippon Seiko Co., Ltd. (headquarters: Shinagawa-ku, Tokyo, legal representative: director representative, executive president and CEO Toshihiro Uchiyama, hereinafter referred to as NSK) has successfully developed high-speed ball bearings for electric vehicle drive motors. The development of this product can greatly increase the speed of the drive motor, and has made a great contribution to reducing the energy consumption of electric vehicles, extending the cruising range and improving driving comfort. NSK expects this product to achieve a sales target of 10 billion yen in 2030. Development background As a series of environmental problems caused by the greenhouse effect and exhaust emissions are intensifying, the popularization of more environmentally friendly electric vehicles has become a common expectation of the society. For the popularization of electric vehicles, an important issue currently facing is to seek a vehicle space that can carry a larger battery in order to increase the cruising range. In recent years, with the miniaturization and weight reduction of electric vehicle drive systems and the increasing market demand for high-efficiency drive motors, higher speed requirements have been put forward for ball bearings used to support drive motors. Under the high-speed rotating condition of the ball bearing, due to the influence of heat, poor lubrication will cause seizing; in addition, due to the influence of centrifugal force, the deformation of the cage and damage to the cage are also issues that need to be solved urgently. Features of high-speed ball bearings NSK developed grease with excellent seizure resistance  By using NSK's original developed grease, it is possible to suppress poor lubrication due to heat generation and extend the service life compared to conventional greases. Development of a new shape cage  Through reducing the thickness of the front end of the cage and lightweight design, the influence of centrifugal force is reduced. At the same time, by increasing the rigidity of the bottom of the cage, the deformation of the cage during high-speed rotation can be suppressed  This shape of the cage The application can greatly reduce the deformation of the cage when it rotates at high speed. Development of High Rigidity Resin Material for Cage    In order to suppress deformation of the cage during high-speed rotation, a resin material with excellent heat resistance and rigidity has been successfully developed. This resin material can greatly reduce cage deformation caused by centrifugal force during high-speed rotation.  Through the application of NSK exclusive developed grease and newly developed resin cage, this product can realize dmN*1=1.4 million high-speed rotation conditions (bearing inner diameter: 35mm; speed: 30000rpm). *1dmN: The product of [Bearing pitch diameter (dm)] and [Speed ​​(N)] is an indicator of bearing speed performance. The effect of the developed product This high-speed ball bearing is currently the ball bearing with the highest limit speed in the world*2. The successful development of this product provides the possibility for a substantial increase in the speed of the electric vehicle drive motor. At the same time, by improving the efficiency of the drive motor, the drive motor can be miniaturized and lightweight, contributing to the reduction of energy consumption of electric vehicles, the extension of cruising range, and the improvement of driving comfort. It is scheduled for the end of 2020 to release bearings (dmN value 1.6 million) that can meet higher speed requirements.
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