F-568217 Hybrid Ball Bearings for FANUC Servo Motor

Hybrid Ball Bearings generally consist of an outer ring, an inner ring, rolling elements, and a cage. The outer ring is installed inside the bearing housing bore and generally does not rotate. The inner ring is mounted on the journal and rotates with the shaft. Rolling elements are the core components of rolling bearings, and the cage evenly separates the rolling elements to prevent friction. Lubricant is also considered the fifth major component of rolling bearings, and it mainly plays the roles of lubrication, cooling, and cleaning. Servo motors have higher requirements for bearings due to their operating characteristics. At the same time, servo motors for different applications have more detailed requirements for bearings. For standard servo motors, deep groove ball bearings with seals or dust covers are often used. Cylindrical roller bearings are used only in medium and large motors. Therefore, the main performance requirements for bearings are low vibration and noise, low friction torque, and good sealing performance.

Given the characteristics of servo motors, such as high-frequency start/stop, rapid commutation, precise positioning, and operation over a wide speed range, the equipment also places higher precision requirements on the bearings. Servo systems require extremely small rotational errors and stable operation. Conventional P0 and P6 grade general-purpose bearings have loose tolerances and limited rotational accuracy. During operation, they are prone to problems such as angular deviation, positioning error, and low-speed crawling. Friction loss is also relatively high, making it difficult to match the usage requirements of servo devices. Based on the working requirements of servo devices, the industry mainstream uses P5 precision grade and P4 ultra-precision grade bearings (complying with ISO 492:2023 and GB/T 307.1-2024 standards).The precision indicators of this type of bearing have been significantly tightened, and the angular deviation can be controlled within ±0.01°, the repeatability accuracy reaches ±0.005mm, and the dynamic response can reach the millisecond level, completely avoiding the problem of low-speed crawling. At the same time, compared with P6 grade bearings, friction loss can be reduced by 20%~30%, ensuring the continuous and stable operation of the servo system. Therefore, bearings can be said to be a key component that determines the performance of the whole machine.

We implement standardized management and control over the entire process of servo motor bearings, focusing on the core requirements of batch consistency and stability. From raw material selection and precision machining to heat treatment and ultra-precision machining, each process undergoes rigorous quality inspection to strictly control key dimensional tolerances and raceway precision. Meanwhile, through batch sampling inspection, torque consistency verification, vibration and noise screening, and simulated working condition durability testing, subtle performance differences can be identified, effectively avoiding problems such as batch deviation and uneven individual performance, ensuring that the precision of each batch of bearings is highly consistent and the performance is stable, meeting the high-quality usage requirements of batch assembly into servo motors.