NTN will further promote the market development of high-speed deep groove ball bearings.
The high-speed deep groove ball bearing developed by NTN Co., Ltd. (hereinafter referred to as NTN) for electric vehicle drive system, hybrid electric vehicle motor and gearbox reaches dmn value1 2.2 million under oil lubrication.
In recent years, various industries are developing technologies to reduce carbon dioxide emissions to achieve carbon neutrality.
In the field of automobiles, countries are also tightening fuel efficiency standards and carbon dioxide emission regulations for vehicles. The urgent task is to develop electric drive devices to drive electric vehicles, so as to replace gasoline engines and diesel engines.
People have higher and higher requirements for electric drive devices, pursuing low friction, compactness and lightweight to save energy and power.
The three in one system integrating motor, electric control and reducer has a good development momentum. Therefore, the bearings used in small high-speed motors and reducers need to have excellent high-speed performance to suppress abnormal temperature rise and damage during high-speed rotation.
NTN quickly responded to the market demand for high speed and developed grease lubricated high-speed deep groove ball bearings in 2015.
The product improves the strength by adjusting the material ratio of the cage, and reduces the cage deformation caused by centrifugal force and realizes high-speed rotation by designing the pocket shape of the cage in direct contact with the rolling body.
NTN also applies this design to the condition of oil lubrication, and the products are being mass produced and supplied to major vehicle companies and parts manufacturers. However, in order to coordinate with higher motor speed and achieve super high speed rotation, in addition to solving the problems of cage deformation and insufficient strength due to centrifugal force, it is also necessary to ensure the rotation accuracy of the rolling element and each raceway ring, and optimize the oil feeding mode and oil volume of lubricating oil.
NTN established an algorithm to calculate the heat balance between bearing heating and heat dissipation under different lubrication conditions, and obtain the appropriate oil supply.
In addition, in addition to improving the cage shape to restrain the deformation caused by centrifugal force, the internal design was optimized to ensure the rotation accuracy of the rolling element and raceway ring, and the high-speed rotation of the deep groove ball bearing with a dmn value of 2.2 million was realized.
In the future, with the popularization of electric vehicles and hybrid electric vehicles, the demand for high-speed rotating bearings in the automobile market is expected to further increase.
NTN will further promote the market development of high-speed deep groove ball bearings and make contributions to the electrification of vehicles and the reduction of power and fuel consumption.
1. dmn value: an index to identify the rotation performance of the bearing, that is, the pitch diameter of the bearing (mm) × Rotation speed (min - ¹)
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