LTZC manufactured a 12,000 mm diameter Ferris wheel slewing bearing for a theme park in Spain.

As a professional manufacturer of slewing bearings, LTZC recently successfully produced an ultra-large Ferris wheel slewing bearing with a diameter of 12,000 mm for a major theme park project in Spain. This project not only showcases LTZC's manufacturing capabilities in the field of ultra-large-diameter slewing bearings but also further demonstrates the company's expertise in providing bearing solutions for heavy-duty amusement equipment.

I. Technical Challenges: Operational Analysis of a 12-Meter-Diameter Large Slewing Bearing

1.1 The Conflict Between Massive Size and Ultra-High Load Capacity

With a diameter of 12,000 mm, this slewing bearing falls into the category of large-scale slewing bearing projects. However, as size increases, rigidity tends to decrease, creating a susceptibility to deformation risks. Furthermore, the Ferris wheel faces demanding operational conditions—including long-term continuous operation interspersed with frequent starts and stops, heavy loads exceeding 500 tons, and overturning moments caused by strong winds. Consequently, the slewing bearing is required to possess ultra-high rigidity, exceptional compressive strength, and superior resistance to overturning forces; failure to meet these standards would result in catastrophic malfunctions during operation, such as raceway deformation, seizure of rolling elements, or gear tooth fracture.

1.2 Stringent Requirements for Ultra-Low Noise and High Operational Smoothness

One of the core competitive advantages for a theme park Ferris wheel lies in the visitor experience, which demands an operation free from noticeable noise, vibration, or jerky movements.

Noise in large slewing bearings primarily stems from three factors: friction during gear meshing, impact between rolling elements and the raceway, and structural resonance. Given the massive 12-meter diameter—resulting in a gear circumference of nearly 38 meters—even slight deviations in gear meshing precision, raceway surface finish, or assembly clearance control can generate jarring noise and high-frequency vibrations. Such issues not only detract from the visitor experience but also accelerate component wear and reduce service life, thereby posing an ultimate test to the slewing bearing manufacturer's capabilities in precision machining and assembly.

1.3 High Corrosion Resistance and Longevity in Extreme Environments

The theme park in Spain is situated along the Mediterranean coast, characterized by a subtropical Mediterranean climate. The site is subject to constant erosion from strong sea winds, salt spray, and rainfall throughout the year, classifying it as a highly corrosive environment. Concurrently, the Ferris wheel operates 12 hours a day, 365 days a year; over a 20-year span, its cumulative operating time exceeds 87,600 hours—a duration far surpassing that of slewing bearings typically found in conventional heavy engineering machinery.

1.4 Challenges in Precision Manufacturing, Transport, and Installation of Super-Large Components

The 12-meter-diameter large slewing bearing is classified as a "super-large component," with a single unit weighing over 80 tons. Consequently, every stage of the process—from forging, heat treatment, machining, assembly, and testing, through to transportation and on-site installation—presents significant technical and logistical challenges.

II. Customized Bearing Solutions: LTZC’s Technical Breakthrough in Large-Scale Slewing Bearings—Tailored for Ferris Wheels

2.1 High-Strength, Corrosion-Resistant Alloy Steel

To meet the specific requirements of the Spanish project—characterized by ultra-large dimensions, extremely high load capacities, and highly corrosive environmental conditions—LTZC selected 42CrMo4 high-strength structural alloy steel. This material possesses exceptional tensile strength, making it the preferred choice for large-scale, heavy-duty slewing bearings.

2.2 Three-Row Roller Slewing Bearings—A Heavy-Duty Structure

To accommodate the project's ultra-large diameter of 12 meters, heavy-duty load of 500 tons, and stringent requirements for resistance to overturning moments, LTZC adopted a three-row roller heavy-duty structural design. Among all heavy-duty turntable bearing configurations, this structure offers the highest load-carrying capacity, the greatest rigidity, and superior resistance to overturning moments, making it perfectly suited to meet the complex load demands of giant Ferris wheels.

2.3 Advantages of LTZC’s Three-Row Roller Slewing Bearings

2.3.1 Three-Row Roller slewing bearing Layout: Uniform Load Distribution

With three independent rows of rollers sharing the load cooperatively, the 500-ton-class heavy load is distributed uniformly across every rolling element, thereby preventing localized stress concentrations. This design boosts rigidity by over 40% compared to single-row ball-type bearings and increases resistance to overturning moments by over 50%, effectively resolving the inherent conflict between ultra-large dimensions and the need for high structural rigidity.

2.3.2 Thickened Inner and Outer Ring Design: Inhibiting Deformation

The inner and outer rings feature a thickened cross-section design—with an inner ring thickness of 120 mm and an outer ring thickness of 150 mm. This represents a 30% increase in thickness compared to standard slewing bearings of the same diameter, significantly enhancing bending rigidity and resistance to deformation. This ensures that under extreme load conditions, the total deformation remains ≤ 0.03 mm, thereby satisfying the critical requirements for highly stable and smooth operational performance. 2.3.3 External Gearing Design: Smooth and Low-Noise Transmission

Utilizes external involute cylindrical gears with a module of m=25 and 456 teeth. The gear precision meets ISO 1328-1 Grade 7 standards (ultra-high precision), featuring super-fine grinding and polishing of the tooth surfaces to achieve a surface roughness of Ra ≤ 0.8 μm.

2.3.4 Multi-Lip Composite Sealing Structure: IP65 Protection Rating

Designed to withstand high temperatures, high humidity, salt spray, and rainwater erosion, the unit employs a dual-seal system—comprising inner and outer ring seals—combined with a multi-lip composite sealing structure. This design effectively prevents the ingress of dust, rainwater, and salt spray into the bearing interior, thereby safeguarding the raceways and rolling elements against corrosion and preventing lubricant loss. The result is a highly reliable sealing system requiring no maintenance for five years.

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III. LTZC Large-Scale Slewing Bearings: Leading the Global Upgrade of Heavy-Duty Bearings for Amusement Facilities

The 12-meter-diameter heavy-duty slewing bearing—custom-engineered by LTZC for a theme park in Spain—perfectly resolved four core challenges faced by the client: ultra-large dimensions, ultra-high load capacity, ultra-low noise operation, and adaptability to extreme environmental conditions. This achievement delivered significant value to the client.

As a benchmark enterprise in the field of large-scale slewing bearings, the successful execution of this Spanish project by LTZC provides the global amusement facility and heavy equipment sectors with a comprehensive solution featuring high load capacity, high reliability, long service life, low noise levels, and robust corrosion resistance. This initiative holds profound significance for the industry:

Standard Leadership:  The triple-row roller heavy-duty structure adopted in this project establishes a high-end benchmark for customized design and manufacturing within the global Ferris wheel bearing sector.

Technological Empowerment: The critical manufacturing technologies mastered for these ultra-large, heavy-duty bearings are replicable and applicable across a wide range of fields, including large-scale Ferris wheels, rotating stages, port cranes, and wind turbine yaw systems.

Industrial Upgrading:  This project serves as compelling proof that specialized Chinese slewing bearing manufacturers possess world-class capabilities in the R&D and manufacturing of ultra-large-scale components.

Choose LTZC — Your Reliable Large Slewing Bearing Manufacturer Worldwide