NewBee Machinery is a professional machinery parts manufacturer providing high quality precision bearings, high-quality non-standard transmission components, and intelligent CNC equipment and more.
NewBee Machinery is a professional machinery parts manufacturer providing high quality precision bearings, high-quality non-standard transmission components, and intelligent CNC equipment and more.
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 100-4000mm,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 reducer layouts.Sealing Solutions:Standard non-contact labyrinth seals for general construction sites;triple-lip polyurethane contact seals for muddy,dusty,splash-heavy harsh construction environments.Fluoropolymer seals are optional for special corrosive conditions.Lubrication Modes:Long-service lithium-based grease for routine construction 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 for construction machinery require separate lead-time negotiation.
Construction Machinery covers all heavy engineering equipment applied to infrastructure,road construction,building projects,mine exploitation and municipal works.Typical core models include hydraulic excavators,tower cranes,crawler lifting cranes,concrete pump trucks,aerial work platforms,road rollers and shield tunneling machines.All these devices are equipped with large slewing turret structures,which realize full 360° rotation of lifting booms,digging arms and operation platforms.During daily construction cycles,rotary components bear huge instantaneous impact loads and eccentric overturning moments generated by heavy cargo and excavation resistance.Meanwhile,construction sites feature severe harsh conditions:cement dust,mud,gravel splash,day-night temperature fluctuation and rainwater erosion.Ordinary single-row slewing bearings suffer easy raceway deformation,clearance expansion and premature wear under frequent heavy shock loads,leading to turret shake,positioning offset and frequent equipment downtime.Therefore,heavy-duty construction rotary mechanisms must adopt double row slewing bearings with superior composite load resistance and structural rigidity.
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. [1]
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. [1]
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.
Withstand Heavy Construction Shock & Eccentric Overturning Loads:When excavators dig hard soil and tower cranes lift heavy precast components,the slewing turret generates instantaneous impact force and large tilting moment.The dual-ball layout distributes stress uniformly to two raceway surfaces,effectively restraining turret bending deformation,avoiding boom shaking and cargo slipping risks during lifting and excavation operations.
Reliable Sealing Resists Harsh Site Mud & Dust:Triple-lip polyurethane sealing structure prevents gravel,cement slurry and rainwater from penetrating internal raceways.Compared with single-row bearings,double row slewing bearings have thicker sealing fit clearance,effectively reducing abrasive particle wear and extending service life under messy construction working conditions.
Reduce Equipment Failure & Construction Downtime:42CrMo fully quenched ring material improves fatigue resistance by over 30%,adapting millions of frequent start-stop slewing cycles every day.Less frequent bearing replacement cuts construction equipment breakdown time and project delay losses for engineering contractors.
Multiple Gear Types Match All Construction Drive Schemes:Newbeetrans supplies gearless,external gear and internal three structural series double row slewing bearings,which can perfectly match hydraulic motor and reducer drive systems of various construction machinery,eliminating extra gear modification costs for machinery manufacturers.
Wide Temperature Lubrication Suits All-region Projects:Custom low-temperature anti-solidification grease can be equipped for northern winter construction,while high-temperature resistant lubricant is available for tropical open-air works.No grease failure or dry friction occurs under drastic day-night temperature differences to guarantee uninterrupted construction operation.
Simplify Construction Machine Turret Structural Design:One double row slewing bearing replaces sets of single-row bearing combinations,reducing the thickness and overall weight of turret frames,lowering whole vehicle manufacturing cost and shortening prototype R&D,assembly and precision debugging cycles for construction machinery factories.
Newbeetrans is a professional manufacturer specialized in double row slewing bearings customized for all kinds of heavy construction machinery.We supply full-size standard double row slewing bearing stock and heavy-load,dust-proof,mud-resistant customized solutions for engineering 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 compression,sealing waterproof and dust aging tests before delivery.
Diversified Construction Customization Service:Support 42CrMo/50Mn alloy steel material selection,internal/external/gearless three gear forms,triple-lip anti-mud sealing,wide temperature special grease and non-standard large-diameter tailor-made models.
Stable Fast Delivery:Standard series bearings are in stock for shipment within 7-15 days;construction 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,dustproof and heavy load 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 construction machinery turret rotary mechanisms.
For technical specifications,pricing,or custom bearing solutions:
Email:paul@newbeetrans.com
Website:www.newbeetrans.com
WhatsApp
sales@newbeetrans.com
+8615090185276