en.Wedoany.com Reported - On June 10, JTEKT announced the development of a grease-lubricated ceramic ball bearing capable of high-speed rotation at 30,000 r/min. By optimizing the eAxle (electric drive axle) components of high-performance electric vehicles (EVs), this product aims to address the lubrication and high-speed requirements of motor bearings under oil-free operating conditions.

This bearing uses ceramic balls as rolling elements, leveraging their non-conductive properties to prevent electrical erosion (electrical corrosion), and optimizes grease life to accommodate high-speed rotation. To achieve high-speed operation at 30,000 r/min, JTEKT adopted a resin cage suitable for high-speed rotation, a non-contact sealing structure, and optimized the grease formulation.

In the high-performance EV sector, where demand for high-output drive motors is growing, some eAxle motors cannot be supplied with oil internally due to vehicle design or unit structure constraints. Addressing this pain point, JTEKT selected a grease lubrication solution over oil lubrication, enabling the bearing to be integrated into the eAxle system while supporting high-speed rotation of the drive motor.

The developed product uses high-carbon bearing steel for the rings (inner and outer rings), while the rolling elements are lightweight, high-rigidity, non-conductive ceramic balls. The lightweight rolling elements reduce centrifugal force, thereby suppressing heat generation in the high-speed region. The non-contact sealing structure improves grease retention, and the high-rigidity cage design ensures stability during high-speed operation.

Additionally, JTEKT combines the bearing with a synthetic long-life grease that exhibits excellent oil retention, water resistance, and corrosion resistance in high-temperature regions, thereby enabling continuous operation and extended lifespan of the drive motor under high temperatures.

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