LTZC Manufactures Segmented large bearings for Marine.

As marine engineering equipment continues to evolve toward larger scales, modular designs, and higher load capacities, traditional monolithic large slewing bearings have gradually revealed numerous limitations regarding transportation, installation, and maintenance. Against this backdrop, segmented large bearings—well-suited for scenarios involving limited installation space or challenging transportation logistics—have emerged as a vital solution across sectors such as shipbuilding, offshore platforms, and port hoisting equipment.

As a specialized manufacturer of slewing bearings, LTZC has long focused on the R&D and production of ultra-large-diameter slewing bearings, having accumulated extensive engineering expertise—particularly within the field of marine slewing bearings.

I. What Are Segmented Large Bearings?

1.1 Definition

Segmented large bearings refer to a type of bearing in which a complete, large-diameter slewing bearing is divided—in accordance with design specifications—into multiple independent segments for the purposes of manufacturing, transportation, and installation; these segments are ultimately assembled on-site to form a complete structural unit. Segmented structures are typically adopted when installation space is limited or when the bearing's sheer size renders it impossible to package and transport as a single unit. This design is commonly applied to ultra-large bearing systems with diameters exceeding 4,000 mm—or even reaching tens of thousands of millimeters.

1.2 Structure of Segmented Bearings

Segmented bearings are a specific variant of slewing bearings; the primary distinction lies in their physical form—appearing as multiple distinct segments—whereas standard slewing bearings typically exist as a single, continuous ring. The structural components of a segmented bearing include the inner ring, outer ring, rolling elements, cage, sealing system, gear ring, lubrication system, and other ancillary parts.

1.3 How Do Segmented Bearings Work?

The operating principle of segmented bearings is identical to that of traditional slewing bearings: a drive motor's pinion engages with the slewing bearing's gear ring to transmit power, thereby driving the rolling elements to rotate and roll within their raceways. This mechanism facilitates low-friction, high-load rotational support, while simultaneously accommodating axial loads, radial loads, and overturning moments.

1.4 Application Fields for Large Segmented Bearings

Slewing platforms for offshore crane vessels

FPSO (Floating Production, Storage, and Offloading) units

Offshore wind turbine installation vessels

Slewing systems for large-scale deck machinery

Marine radar and weapon platforms

II. Differences Between Segmented Bearings and Complete Bearings

2.1 Structural Differences

A segmented bearing is a slewing bearing formed by splicing multiple segments together into a ring shape. Its dimensions are not restricted by machining limitations; however, the manufacturing process—which is relatively complex—must carefully account for load-bearing capacity and potential deformation issues. In contrast, a complete bearing is forged as a single, integral unit; while its dimensions are typically constrained by machining and transportation capabilities, complete slewing bearings offer superior load-bearing capacity and are highly resistant to deformation.

2.2 Transportation and Installation

Segmented bearings offer distinct advantages regarding transportation and installation: they can be disassembled for transport, making them ideal for bearings with exceptionally large diameters, and they allow for flexible on-site assembly. Conversely, complete bearings require specialized hoisting equipment and impose stricter requirements regarding installation space.

2.3 Precision and Performance

Traditionally, complete bearings were considered to offer higher precision. However, thanks to breakthroughs achieved by LTZC in segmented machining and splicing technologies, segmented bearings can now attain a level of precision closely approaching that of integral bearings. Through the application of pre-tensioning designs and splicing calibration techniques, their operational stability is effectively guaranteed.

2.4 Maintenance and Replacement

Segmented bearings possess clear advantages in terms of maintenance and replacement: if a specific segment suffers from severe wear, only that individual segment needs to be replaced, eliminating the need to dismantle the entire bearing assembly and thereby reducing maintenance costs. In contrast, if a complete slewing bearing suffers from wear and cannot be repaired, the entire bearing unit must be replaced.

III. Case Study: LTZC 7300mm Segmented Bearing for Large Vessels

3.1 Project Background

A major European shipbuilder required a slewing bearing system with a diameter exceeding 7 meters for the construction of a heavy-lift offshore crane vessel. The LTZC team, possessing extensive manufacturing experience in marine bearings, engaged in multiple rounds of technical and experiential exchanges with the client. Recognizing that marine bearings frequently face environments characterized by heavy loads and severe corrosion—and noting the exceptionally large dimensions and strict installation space constraints of this specific design—the team opted to implement a segmented marine slewing bearing solution capable of simultaneously ensuring high load-bearing capacity.

3.2 Technical Parameters of the Segmented Large Bearing (Example)

Diameter: 7300 mm

Structure: Three-row roller slewing bearing

Number of Segments: 12

Material: 42CrMo high-strength alloy steel

Heat Treatment: Integral quenching + Surface induction hardening

Gearing Type: External gear

Corrosion Protection Class: Marine-grade anti-corrosion coating (C5-M)

Problem Solved: The integral bearing features a diameter exceeding 7 meters and weighs over 100 tons, rendering it impossible to transport or hoist as a single unit. The segmented design allows it to be disassembled into 4 to 8 sections, which are then transported to the site—via road or sea—and reassembled on-site, thereby significantly reducing logistics and installation costs.

3.3Technical Innovation in LTZC Segmented Large-Scale Bearings

Segmented Precision Manufacturing: The segmented joint faces undergo CNC grinding; combined with high-precision dowel pins and bolts, the assembled unit achieves P5-grade accuracy in both roundness and gear ring runout.

Impact and Deformation Resistance: Features an unequally divided, multi-segment structure designed to counteract hull deformation caused by wind and waves, thereby preventing localized overloading of the raceway.

Marine-Grade Corrosion Protection: The surface utilizes a thermal-sprayed aluminum coating supplemented by a sealant layer; having passed salt spray tests exceeding 1,000 hours, it ensures 20 years of maintenance-free operation in marine environments.

Convenient Maintenance: No need to dismantle the entire assembly; individual segments or roller assemblies can be replaced independently. The sealing system allows for the online replacement of sealing lips.

Operational Adaptability: Equipped with built-in temperature and vibration sensors that integrate with the vessel's central control system to provide real-time alerts regarding anomalies. Supports operation across a wide temperature range of -20°C to +60°C.

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IV.  Manufacturer of Segmented Large Bearings-LTZC

Leveraging advanced manufacturing processes and extensive project experience, LTZC has successfully applied segmented bearings in numerous high-end marine projects—most notably in a 7,300mm marine segmented bearing application—thereby fully validating their reliability and cost-effectiveness.

If you are seeking high-performance marine slewing bearings or customized solutions, LTZC stands as a trustworthy partner.

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