Bidirectional Thrust Angular Contact Ball Bearing
1. Core Definition of the Product
Double-direction thrust angular contact ball bearings are highly integrated and compact bearings specifically designed for bidirectional axial heavy-load scenarios in precision equipment. Through an innovative structure where "symmetrical raceways of inner and outer rings form four sets of effective contact points with steel balls", they break the limitation that traditional single bearings can only carry loads in one direction. This enables a single bearing to simultaneously perform the composite function of bearing bidirectional axial loads, certain radial loads, and slight overturning moments.
Their core value lies in replacing the multi-component combination scheme of "two single-direction thrust bearings + radial bearings" with a compact structure. While ensuring P4/P5 grade rotational accuracy, they significantly optimize the spatial layout and assembly efficiency of equipment. These bearings are widely used in mid-to-high-end equipment fields that have high requirements for accuracy, load-carrying capacity, and space.
2. Product Structure Composition
Double-direction thrust angular contact ball bearings consist of inner ring, outer ring, steel balls, cage, optional sealing assembly, and lubrication system. Each component is manufactured using high-precision processes to collaboratively achieve the function of "bidirectional axial heavy load + precision rotation". The specific structural parameters and characteristics are shown in the table below:
|
Component Name |
Material/Process Details |
Key Specification Parameters |
Core Function |
Process Advantages |
|
Inner Ring & Outer Ring |
Adopt GCr15SiMn high-carbon chromium bearing steel, undergoing processes including "spheroidizing annealing (reducing hardness to HB180-200) → rough machining → integral quenching (850℃±10℃, ensuring uniform hardness) → low-temperature tempering (180℃±5℃, eliminating internal stress) → ultra-precision grinding (using CNC grinding machine, positioning accuracy ≤0.0005mm)". The surface is treated with anti-rust treatment (some models are hard chrome-plated with a film thickness of 3-5μm, increasing wear resistance by 30%) |
Inner diameter range: 10-200mm (tolerance grade P4/P5); contact angle: optional 15°/25°/40°; raceway curvature radius = steel ball diameter × 0.51-0.53; raceway roughness Ra≤0.2μm; parallelism of inner and outer rings ≤0.002mm/m |
Provide the foundation for bearing bidirectional axial loads; contact angle design adapts to different load requirements (40° contact angle has the strongest axial load-carrying capacity); high hardness (HRC60-62) ensures wear resistance and service life |
Integral quenching process improves hardness uniformity by 20%; ultra-precision grinding ensures raceway profile error ≤0.001mm; hard chrome plating extends surface wear life to 1.5 times that of ordinary treatment |
|
Steel Balls |
Adopt GCr15 bearing steel (high-end models use silicon nitride ceramic balls), undergoing processes including "cold heading (forming accuracy ≤0.01mm) →光球 (reducing surface roughness) → heat treatment (quenching + tempering, improving hardness) → hard grinding (controlling diameter tolerance) → precision lapping (optimizing roundness)". The roundness of steel balls is ≤0.0005mm |
Diameter tolerance: G5 grade (≤0.001mm); surface roughness Ra≤0.01μm; hardness of steel balls: HRC62-64; density of ceramic balls: 3.2g/cm³, HV1600 and above |
Realize bidirectional contact between inner/outer ring raceways and steel balls, transmit axial loads and reduce rotational friction; ceramic balls are suitable for high-temperature (≤200℃) and high-speed (≤15000r/min) scenarios |
Precision lapping process reduces the roundness error of steel balls by 50% compared with ordinary processing; the thermal conductivity of ceramic balls is 3 times that of steel, which can effectively reduce temperature rise during high-speed operation |
|
Cage |
Adopt brass cage (H62 brass, die-cast, density ≥98%) or engineering plastic cage (PA66 + 30% glass fiber, temperature resistance 120℃, improved anti-aging performance). Large-size bearings use split-type cages (facilitating assembly and maintenance) |
Pocket clearance: 0.08-0.15mm; hardness of brass cage: HB80-100; impact strength of plastic cage: ≥7kJ/m² |
Evenly separate steel balls to avoid collision and friction between them; guide steel balls to roll smoothly along raceways; reduce operating noise (≤60dB) |
Die-cast brass cage has dimensional accuracy up to IT8 grade; plastic cage is 40% lighter than brass; split structure improves the assembly efficiency of large bearings by 30% |
|
Optional Sealing Assembly |
Adopt nitrile rubber (NBR) sealing ring or fluororubber (FKM) sealing ring (for high-temperature scenarios), with interference fit with inner and outer rings (interference 0.05-0.1mm). The lip of the sealing ring is equipped with a dust-proof edge (width 1mm, enhancing dust-proof effect) |
Protection grade: IP54 (NBR sealing ring)/IP55 (FKM sealing ring); cross-sectional size of sealing ring: 3×5mm-8×12mm (adapted to bearing models) |
Block dust (≥0.1mm) and slight water vapor intrusion; prevent lubricating grease leakage; suitable for machine tool workshops, automated clean rooms and other scenarios |
NBR sealing ring has excellent oil resistance (volume change rate ≤10%); FKM sealing ring has a maximum temperature resistance of 200℃; dust-proof edge design increases dust blocking rate by 25% |
|
Lubrication System |
Factory pre-filled with extreme pressure lithium-based grease (e.g., Shell Omala RL2, extreme pressure performance PB≥900N); 1-2 lubrication holes (M3-M6 thread, no lubrication holes for small bearings) reserved; suitable for grease lubrication and oil mist lubrication |
Filling amount of lubricating grease: 1/3-1/2 of the internal space of the bearing; oil mist lubrication is suitable for rotational speed ≤15000r/min; maintenance cycle of grease lubrication: ≥2000 hours |
Reduce friction and wear between steel balls and raceways; lower operating temperature rise (temperature rise ≤35℃ under high-speed conditions); extend bearing service life |
Extreme pressure grease can withstand heavy-load impact; oil mist lubrication reduces the friction coefficient to 0.001 under high-speed conditions, reducing temperature rise by 15℃ compared with grease lubrication |
3. Application Scenarios
Based on the characteristics of "bidirectional axial load-carrying + high precision + compact structure" of double-direction thrust angular contact ball bearings, they are widely used in scenarios requiring precise axial positioning and bidirectional heavy-load support. The specific adaptation logic is as follows:
Machine Tool Field: For axial support of spindles in CNC lathes (e.g., Shenyang Machine Tool CAK6150) and vertical machining centers (e.g., Han's Laser HMC500), they need to bear bidirectional axial cutting forces (≤80kN). P4 grade rotational accuracy (axial runout ≤0.005mm) can avoid roundness errors (≤0.003mm) of machined workpieces, ensuring precision machining quality. For axial positioning of precision ball screws (e.g., THK BNK series), they are suitable for high-speed feed systems (≤6000r/min). The 15° contact angle design balances axial load and rotational resistance, reducing axial runout of the screw (≤0.002mm) and improving the feed accuracy of machine tools.
Automation & Precision Transmission Field: For axial support of wrist joints in 6-axis industrial robots (e.g., Estun ER16-1000), they need to bear bidirectional axial forces (≤50kN) generated by the robot's end load and high-frequency start-stop (≥20 times/minute). The low friction coefficient (≤0.0012) reduces joint energy consumption, and P5 grade accuracy ensures the robot's positioning error ≤0.01mm. For axial positioning of precision planetary gearboxes (e.g., Neugart PLN series), the 25° contact angle adapts to the composite load generated by gear meshing, avoiding transmission noise (≤55dB) and gear wear (wear rate ≤0.0005mm/1000 hours) caused by axial runout.
New Energy & High-End Equipment Field: For axial support of spindles in small wind turbines (below 1.5MW, e.g., Goldwind GW1500), they need to bear bidirectional axial thrust (≤120kN) generated by the rotation of wind turbine blades. The 40° contact angle design improves axial load-carrying capacity, and the fatigue life (≥20000 hours) meets the long-term operation requirements of wind power equipment. For axial support of rotating tables in medical CT machines (e.g., Siemens SOMATOM Definition AS), the low noise (≤58dB) and high precision (radial runout ≤0.008mm) characteristics avoid the impact of equipment operating noise on patients and ensure CT imaging accuracy (resolution ≤0.1mm).
Aerospace & Precision Instrument Field: For axial support of accessory transmission systems in aero-engines (e.g., a certain type of turbofan engine), they need to bear bidirectional axial loads (≤60kN) in high-temperature (≤150℃) and high-speed (≤8000r/min) environments. FKM seals and ceramic steel balls adapt to extreme working conditions, ensuring stable operation of the transmission system. For axial support of rotating shafts in precision laser measuring instruments (e.g., Keyence LK-G80), P4 grade high precision (axial runout ≤0.003mm) reduces the impact of rotation errors on measurement accuracy (measurement error ≤0.001mm).
4. Summary of Core Product Advantages
High Bidirectional Axial Load-Carrying Efficiency: A single bearing can replace the combination scheme of "two single-direction thrust bearings + radial bearings", realizing the bearing of bidirectional axial loads (≤200kN) and certain radial loads (≤50kN). The installation space is reduced by more than 35%, and the equipment weight is reduced by 25%, significantly simplifying the equipment structure.
High and Stable Rotational Accuracy: P4/P5 grade accuracy (axial runout ≤0.005mm, radial runout ≤0.008mm). Ultra-precision grinding of raceways and grouped selection of steel balls ensure stable long-term operation accuracy (annual accuracy attenuation ≤0.001mm), meeting the high-precision requirements of machine tools, robots, and other precision equipment.
Strong Adaptability to Multiple Scenarios: Optional contact angles (15°/25°/40°) adapt to different load scenarios; temperature adaptation range of -30℃~150℃ and IP54/IP55 protection grade can cope with different environments such as machine tool workshops, wind power equipment, and medical scenarios; support for both grease lubrication and oil mist lubrication adapts to low-speed to high-speed (≤15000r/min) working conditions.
Long Service Life and Convenient Maintenance: Integral quenching of GCr15SiMn steel and anti-fatigue design ensure a service life of more than 20000 hours (8000 hours for ordinary thrust bearings); reserved lubrication holes and standardized sealing assemblies eliminate the need for complex tools for daily maintenance, reducing maintenance costs by 25%~30% compared with imported bearings.
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