As the wind power industry accelerates its evolution towards multi-megawatt and deep-sea applications, the wind turbine main shaft bearing, serving as the "heart" connecting the rotor and the gearbox, plays an absolutely core role in supporting massive weights of tens or even hundreds of tons and transmitting complex alternating loads. Wind turbines are exposed to open fields or offshore environments for long periods, enduring extreme gust impacts and typhoon attacks, as well as material fatigue caused by salt spray corrosion and extreme temperature differences. When dealing with such unsteady heavy loads, traditional main shaft bearings are highly susceptible to roller skidding and fretting wear due to internal clearance changes, ultimately triggering catastrophic early failures. Wind turbine OEMs urgently need support bearings customized for harsh conditions, featuring ultimate impact-resistance, heavy-load tolerance, and long life.

Facing the stringent wind turbine main shaft requirements for "20-year maintenance-free" and "high reliability," support systems must not only possess excellent composite load-bearing capabilities but also maintain absolute dimensional stability and intact lubrication films under long-term variable loads and impacts. Due to uneven contact stress distribution between raceways and rollers, traditional bearings are prone to surface spalling and subsurface cracks under alternating loads. Furthermore, ordinary greases easily流失 or harden in extreme cold or high temperatures, failing to form effective elastohydrodynamic lubrication. The market urgently demands a wind turbine main shaft bearing solution that can break through the dual bottlenecks of fatigue failure and fretting wear, significantly reducing the Levelized Cost of Energy (LCOE) over the wind power lifecycle and providing solid protection for the stable output of clean energy.

NMT Wind Turbine Main Shaft Bearings are born to conquer the challenges of extreme variable loads and heavy-load impacts. This series achieves disruptive breakthroughs in materials and heat treatment processes. The core rings and rollers comprehensively use high-purity vacuum degassed bearing steel and undergo special carbonitriding and bainitic isothermal quenching processes, endowing the material with extremely high core toughness and surface hardness, effectively inhibiting the initiation and propagation of subsurface cracks. For impact-resistance and heavy-load tolerance, NMT innovatively adopts a "logarithmic profiling" raceway design to precisely optimize the contact stress distribution between rollers and raceways, completely eliminating edge stress concentration and ensuring smooth operation even under extreme overturning moments.

In precision manufacturing and quality control, NMT enforces heavy-industry-grade stringent standards for every component of its wind turbine main shaft bearings. Through special heat treatment processes, logarithmic profiling design, and full-process quality control, the anti-fatigue and impact-resistance performance of the bearings are comprehensively improved. NMT ensures that each bearing maintains an ultra-low wear rate in environments with extreme cold, salt spray, and severe gusts, avoiding fretting wear and surface spalling, guaranteeing high consistency and high reliability of batch products, and completely eliminating shutdown hazards of wind turbines.

With rich specifications, these bearings are widely used in onshore high-power wind turbines, offshore typhoon-resistant wind turbines, wind turbine gearbox main shaft nodes, yaw and pitch systems, satisfying the supporting needs of various impact-resistant, heavy-load, long-life, and maintenance-free transmission nodes.

Core Product Advantages

Core rings and rollers use high-purity vacuum degassed bearing steel, combined with carbonitriding and bainitic isothermal quenching processes, endowing extremely high core toughness and effectively inhibiting subsurface crack initiation;

Innovative "logarithmic profiling" raceway design precisely optimizes contact stress distribution, completely eliminating edge stress concentration and ensuring smooth operation under extreme overturning moments;

Excellent impact-resistance and heavy-load characteristics significantly reduce the risk of roller skidding under unsteady gusts and typhoon attacks, fundamentally eliminating fretting wear and surface spalling;

Ultimate fatigue resistance provides service life far exceeding theoretical calculations under 20-year alternating load conditions, significantly reducing the LCOE of wind power;

Excellent extreme temperature difference resistance and salt spray corrosion resistance. Special surface treatment processes effectively resist offshore salt spray erosion, ensuring dimensional stability in extreme cold and high-temperature environments;

Optimized internal clearance control matched with special wind power grease forms a stable elastohydrodynamic lubrication film across a wide temperature range, ensuring long-term maintenance-free operation;

Full life-cycle high-reliability design significantly reduces downtime maintenance frequency and hoisting replacement costs for wind turbines, ensuring efficient and continuous clean energy output;

Full-process heavy-industry-grade quality control and 100% non-destructive testing full inspection ensure precise dimensions, zero internal defects, and zero early failure risk for each bearing in wind turbine main shafts.

Typical Application Scenarios

Onshore high-power wind turbine main shafts; Offshore typhoon-resistant wind turbine main shafts; Wind turbine gearbox main shaft nodes; Yaw and pitch system transmission nodes.

Precision Quality Assurance

NMT Wind Turbine Main Shaft Bearings use high-purity vacuum degassed bearing steel as core raw materials, subject to strict material purity and core toughness inspections upon incoming. After precision turning, rings undergo special heat treatments such as carbonitriding and bainitic isothermal quenching, followed by ultra-precision grinding, with strict control over raceway surface hardness, residual compressive stress, and micro-geometric accuracy. Precision rolling elements are fully automatically sorted for size, roundness, and weight to ensure consistent load distribution within the same bearing set. All components undergo precision matching and assembly in high-grade workshops, with precise injection of special wind power grease. Finished products undergo 100% rotational precision, non-destructive testing, and impact-fatigue testing. Unqualified products are completely rejected, ensuring the ultimate performance of batch products under extreme conditions such as wind turbine main shafts, providing reliable support solutions for clean energy equipment.

Product Series

Wind turbine main shaft dedicated double-row tapered roller bearings, wind turbine main shaft dedicated four-point contact ball bearings, wind turbine main shaft dedicated cylindrical roller bearings; Selection is based on rotor diameter, ultimate load, design life, and environmental adaptability.

Brand Strength

NMT is deeply engaged in the R&D and manufacturing of wind turbine main shaft bearings. Targeting industry pain points in wind power scenarios—where traditional bearings easily generate fretting wear and subsurface cracks under alternating loads, edge stress concentration leads to early spalling, and extreme temperature differences and salt spray accelerate material fatigue—NMT continuously optimizes high-purity vacuum degassed steel materials, carbonitriding bainitic heat treatment processes, and logarithmic profiling raceway designs. This effectively solves fatal defects of traditional bearings in wind turbine main shafts such as easy skidding, easy spalling, and short service life. It significantly enhances the operational reliability and full life-cycle economic benefits of wind turbines, helping high-end wind power equipment manufacturing enterprises break through core transmission bottlenecks and seize the global new energy equipment intelligent manufacturing market.