It consists of an inner ring, an outer ring, a steel ball and a cage, and the ratio of raceway depth to the diameter of the steel ball has been optimized. Commonly used materials are GCr15 bearing steel (containing 1.0% carbon and 1.5% chromium), and high-end models use ceramic balls (such as Si3N4) or stainless steel (AISI 440C). Surface treatment includes carburizing quenching (hardness up to HRC60-65), coating rust prevention (such as DLC diamond-like coating), and raceway accuracy is ISO-grade (P0/P6/P5/P4/P2).
- : Under pure radial load, the rated dynamic load C value can reach 20-200kN (such as 6208 model C=19.1kN), suitable for uniform speed operation equipment such as motors and pumps;
- : Can withstand small axial loads on both directions (≤10% radial loads), and adapt to temperature deformation through clearance adjustment (C0/C1/C2/C3/C4);
- : The maximum speed of P0 grade 6205 bearings reaches 13000rpm under grease lubrication, and can be increased by 30% when oil lubrication (need to be matched with a low resistance cage).
- : Motor rotor support (such as three-phase asynchronous motor end cover bearings) and conveyor belt rollers in general machinery;
- : CNC machine tool spindle (requires P4 level accuracy, radial jump ≤5μm), industrial robot joints;
- : Fluoroelastic sealing ring can be selected in high temperature environments (-40℃~120℃), and maze dust covers (such as mine conveyors) are required for dust scenes.
- General scenario: 6200 series (inner diameter 10-50mm), clearance C3 level adapted to medium load;
- High-speed working conditions: 7000 series angular contact ball bearings (contact angle 15°/25°), lubricated with oil mist;
- Introduction solution: NSK 6000 series (high cost performance), or domestic HRB brand (precision up to P6 level)
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It consists of a conical inner ring (taper roller assembly), a conical outer ring and stamping cage, with a contact angle of 10°-30° (light load type 10°-16°, heavy load type 25°-30°). The material is made of high-carbon chrome bearing steel (G20CrNiMo), the rollers and raceways have been super finely processed (surface roughness Ra≤0.2μm), and the high-end models use carburizing and quenching process (effective hardening layer depth 0.8-1.5mm).
- : It can bear both radial load and unidirectional axial load at the same time, and the radial load capacity is 1.5-3 times that of deep groove ball bearings of the same size (such as radial rated dynamic load C=55.8kN, axial C0a=63kN);
- : Eliminate internal clearance through axial preload (such as pairing installation), and improve rigidity by 40% (suitable for spindle positioning);
- : Rolling friction coefficient is 0.0015-0.003, 80% lower than sliding bearings, but heating at high speed requires oil lubrication (the limit speed is 60-70% of deep groove ball bearings).
- : Excavator slewing support and truck drive axle (need to withstand axial thrust and road impacts);
- : Lathe spindle rear support (paired, contact angle 25°, axial stiffness up to 15N/μm);
- : Rolling mill working roller bearing (heavy-load type 35° contact angle, impact load resistance reaches 2.5 times the rated value).
- Light load precision: 32000 series (single row, contact angle 15°), suitable for printing press roller shaft;
- Heavy load impact: 31300 series (reinforced roller, convex shape modification design), used in mine crushers;
- Introduction solution: NTN 30300 series (cost-performance ratio is better than domestic products, life coefficient Z=1.3), axial preload must be controlled during installation (it is recommended to use a torque wrench to calculate it according to 0.01-0.03D・N・m, D is the bearing inner diameter mm).
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