How Double Row Slewing Bearings Are Applied in Renewable Energy?

What are Double Row Slewing Bearings?

Double row slewing bearings are heavy-duty rotary ring parts with two independent rows of rolling elements (usually steel balls) placed between an inner and outer ring.They safely support heavy axial forces,radial forces,and tilting moment loads all at the same time.

Core Basic Specifications

Materials:Ring forgings adopt 42CrMo & 50Mn alloy steel with full quenching treatment;rolling balls are high-strength GCr15 bearing steel with high surface hardness.Cages include standard carbon steel,high-temperature resistant brass,and lightweight self-lubricating engineering plastic.Size Range:Inner diameter 100-400mm,outer diameter 150-450mm,overall structural height 50-400mm.Accuracy Grades:P0,P6,P5 industrial precision levels,matching heavy engineering equipment demands.Gear Types:Three standard series available:gearless (020),external gear (021/022),internal gear (023/024) to fit different hydraulic drive layouts.Sealing Solutions:Standard non-contact labyrinth seals for general environments;triple-lip polyurethane contact seals for muddy,dusty,splash-heavy harsh environments.Fluoropolymer seals are optional for special corrosive conditions.Lubrication Modes:Long-service lithium-based grease for routine operation;circulating oil lubrication for continuous high-frequency rotation heavy-load scenarios.Standard operating temperature range:-30℃-120℃,customized low-temperature grease down to -40℃.Delivery Cycle:Standard in-stock models ship within 7-15 working days;heavy-load customized versions require separate lead-time negotiation.

What are Renewable Energy?

Renewable energy refers to clean,recyclable energy sources that replace fossil fuels,mainly including wind power,photovoltaic solar power,concentrated solar thermal power,tidal energy and biomass power generation equipment.The core rotary mechanisms of mainstream renewable energy equipment include wind turbine yaw rotary supports,blade pitch adjustment turntables,dual-axis solar tracker rotary bases,heliostat positioning slewing frames and tidal power unit rotary joints.These rotary components bear long-period alternating eccentric loads caused by wind force,sunlight deflection and tidal impact.The working environments cover inland mountain wind farms,coastal offshore wind fields,desert photovoltaic power stations,high-humidity tidal power plants,featuring wide temperature difference,strong salt fog,sand dust and rainwater erosion all year round.Ordinary single-row slewing bearings have insufficient rigidity and poor anti-corrosion performance,prone to raceway deformation,rotation jitter and premature wear after long-cycle operation,which will lead to unstable power generation efficiency and frequent equipment shutdown maintenance.Therefore,medium and large new energy rotary systems must adopt double row slewing bearings with ultra-high composite load capacity and all-weather environmental adaptability.

The features of Double Row Slewing Bearings

Two-Row Configuration:Features upper and lower raceways that distribute localized stress across dual lines of steel balls or rollers.

Same vs.Different Diameters:Available in same-diameter ball setups for simpler layouts or different-diameter ball designs (larger lower balls) to optimize high tipping-moment resistance.

Integrated Gearing:Frequently built with internal or external gear teeth cut directly into one of the rings to drive 360-degree rotation.

Induction-Hardened Raceways:Raceways are deep-quenched (typically HRC 55–62) to maximize surface wear resistance under severe load.

The applications of Double Row Slewing Bearings

Construction and Lifting Machinery

Tower and Mobile Cranes:Support heavy lifting loads and allow smooth 360-degree rotation.Excavators and Loaders:Manage heavy digging forces and shifting weights during earth-moving work.Concrete Pumps:Handle steady movement and mechanical stress on job sites.

Renewable Energy Systems

Wind Turbines:Used in yaw and pitch systems to turn the massive blades and nacelle toward the wind.Solar Trackers:Help heavy solar panels follow the sun smoothly across the sky.

Marine and Port Equipment

Ship Cranes and Davits:Resist harsh sea conditions and off-center lifting loads.Port Handling Gear:Support loading and unloading heavy cargo containers safely.

Industrial and Specialty Uses

Rotating Tables:Used in factory assembly lines and heavy manufacturing platforms.Medical Systems:Provide stable,precise rotation in large scanning units like CT scanners.

The Importance of Double Row Slewing Bearings in Renewable Energy

Bear Alternating Wind & Solar Eccentric Moment Loads:Wind turbine nacelles and blades generate huge variable overturning loads under gust impact; solar panel frames produce continuous eccentric torque with the change of sunlight angle.The double-row double-ball structure evenly distributes all loads to two raceway surfaces,greatly reducing rotary frame elastic deformation.It keeps stable yaw and pitch adjustment of wind turbines,and consistent sun-tracking angle of solar trackers,maximizing power generation output efficiency.

All-Weather Sealing & Anti-Corrosion Fits Wind & Solar Sites:Custom triple-lip waterproof and dustproof seals block desert sand,mountain dust and coastal salt fog infiltration.For offshore wind power projects,we provide surface anti-salt-fog coating double row slewing bearings to slow ring corrosion.Matched wide-temperature special grease works normally from -40℃ alpine winter to high-temperature desert environment,no grease solidification or volatilization failure in extreme climate.

Ultra-Long Fatigue Life Reduces Power Station Shutdown:Loss 42CrMo fully quenched raceway greatly improves anti-fatigue performance,adapting millions of daily reciprocating rotation cycles of wind pitch and solar tracking mechanisms.Wind power equipment requires 20+ years service life; double row slewing bearings cut frequent disassembly,replacement and maintenance,avoiding power generation interruption and economic loss caused by bearing damage.

Multiple Gear Types Match New Energy Drive Schemes:Internal gear,external gear and gearless three structural series can perfectly match hydraulic motor and electric servo drive systems of wind yaw/pitch mechanisms and dual-axis solar trackers.No extra gear processing modification is needed for new energy equipment manufacturers,shortening prototype development cycle.

High Rigidity Zero-Clearance Ensures Precise Positioning:Factory preload eliminates internal bearing clearance,realizing micron-level repeated positioning accuracy.Wind turbines achieve fast emergency feathering protection under strong wind; solar heliostats accurately focus light to heat collectors,effectively improving new energy equipment operation safety and energy conversion rate.

Compact Integrated Design Optimizes Equipment Layout:Double row slewing bearing integrates bearing and drive gear as a whole,eliminating multi-bearing combined installation structure.It reduces the overall volume and weight of wind nacelle rotary base and solar tracker support frame,lowering tower load and equipment transportation and installation costs for new energy projects.

Manufacturer of Double Row Slewing Bearings

Newbeetrans is a professional manufacturer specialized in double row slewing bearings customized for all wind power and photovoltaic renewable energy equipment.We supply full-size standard stock and salt-fog resistant,wide-temperature heavy-duty customized slewing bearing solutions for new energy equipment manufacturers worldwide.

Full Heavy-Load Inspection Standard:All inner and outer rings adopt integral forging + deep raceway quenching process; every finished bearing undergoes heavy-load fatigue,salt spray aging and sealing waterproof tests before delivery.

Diversified New Energy Customization Service:Support 42CrMo/50Mn material selection,internal/external/gearless gear forms,triple-lip anti-corrosion sealing,low-temperature high-temperature special grease and large non-standard tailor-made models for yaw,pitch and solar tracker turntables.

Stable Fast Delivery:Standard series bearings are in stock for shipment within 7–15 days; renewable energy customized bearing samples can be finished within 10–15 days based on drawing and process complexity.

Authoritative Quality Certification:All products comply with national slewing bearing industrial standards,and SGS salt spray,wide temperature and fatigue test reports can be provided upon customer request.

Global One-stop Technical Support:Complete cross-border global logistics service; professional bearing engineers provide load calculation,gear form and sealing selection guidance for wind and solar rotary mechanisms.

For technical specifications,pricing,or custom bearing solutions:

Email:paul@newbeetrans.com

Website:www.newbeetrans.com