High speed bearings are rolling bearings with a Dmn value exceeding 1.0 × 10 ⁶ mm · r/min. Their performance indicators are defined by the product of the average diameter Dm and the inner ring speed n, and are suitable for high-precision and high-speed scenarios. The bearing consists of an inner ring, an outer ring, ball bearings, and a retaining structure. The inner and outer rings are made of high chromium steel, and the retaining frame is mostly made of nylon material to reduce drag torque. The installation needs to take into account the dimensional changes from room temperature to high temperature and the influence of centrifugal deformation. The stability of the shaft support system is improved through precision dynamic balancing treatment, and a hollow shaft design is used to balance rigidity and mass. The surface treatment adopts grinding technology to reduce friction, optimize the raceway morphology to control roughness and waviness. Typical applications include new energy vehicle drive motors, wind turbine spindles, and aerospace equipment. Future trends focus on the application of ceramic ball bearings and the development of carbon fiber reinforced plastic retainers to meet the needs of electric corrosion and ultra high speed working conditions
High speed bearings require precise dynamic balancing of the rotating system where the bearings are located. The parts where the bearings are installed on the shaft and seat hole should have dimensional and positional accuracy higher than the general requirements. NACHI bearings, especially the coaxiality and perpendicularity of the shoulder to the seat hole or shaft neck, must also pay attention to the high-speed and high-temperature factors during bearing operation when considering these issues.
