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T: +86-156-0511-1716
E: hp018@hpcbkj.com
E: hp018@hpcbkj.com
In Fangong Industrial Park, Dongtai Town, Dongtai City
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The CB790-87 Series Sliding Watertight Lower Rudder Bearing is a critical core component for marine rudder systems, specifically engineered to be installed at the position where the rudder stock passes through the hull’s outer plate. It primarily bears radial forces and ensures hull watertightness, directly influencing a vessel’s steering accuracy and navigation safety. Its key selling points include:
Reliable radial force bearing: Withstands hydrodynamic lateral pressure on the rudder blade and radial loads from rudder stock eccentricity.
Superior watertight performance: Equipped with multi-type sealing devices (J-type/O-type rings, stuffing boxes) to prevent seawater intrusion.
Durable structural design: Bearing body made of bronze, cast iron, or steel for excellent wear resistance and load-bearing capacity.
Flexible compatibility: Available in Type A and Type B configurations to match different rudder stock diameters (50mm–500mm).
Robust Bearing Body: Manufactured from bronze, cast iron, or high-strength steel, ensuring resistance to wear and deformation under long-term radial loads.
Multi-Layer Watertight Sealing: Integrates J-type/O-type rubber rings and stuffing box seals to block seawater ingress, even in rough ocean conditions.
Optional Lubrication System: Equipped with oil filling holes and oil tanks to reduce friction between the rudder stock and bearing, extending service life by 30%+ compared to unlubricated models.
Precision Installation Compatibility: Designed with standard flanges and bolts for secure fixation to the hull’s rudder barrel, ensuring alignment with the rudder stock and blade.
Ocean-Going Cargo Ships: Addresses high radial forces from large rudder blades (e.g., 5–10m²) and harsh saltwater corrosion, maintaining steering stability during cross-ocean voyages.
Fishing Vessels: Withstands frequent rudder adjustments and shallow-water debris impact, thanks to the durable steel bearing body and anti-clogging sealing design.
Passenger Ships: Ensures silent operation via the lubrication system, avoiding noise disruption for passengers, while the watertight seal prevents hull flooding risks.
Bearing Body: The main load-bearing part, with an internal bushing (matched to the rudder stock) for smooth sliding. Bronze variants are ideal for saltwater environments, while cast iron is cost-effective for inland ships.
Sealing Assemblies:
Static seal: Rubber gaskets between the bearing body and hull to prevent water leakage at fixed joints.
Dynamic seal: J-type/O-type rings that adapt to rudder stock rotation, maintaining tightness without friction damage.
Connecting Parts: High-tensile bolts (grade 8.8+) and stainless steel flanges to resist corrosion and ensure structural stability in wave-induced vibrations.
Installation Position: Mounted at the rudder stock’s exit through the hull’s outer plate, above or near the rudder blade, providing a lower support point for the entire rudder system.
Materials undergo salt spray testing (500 hours, no rust) and load testing (sustained radial force of 50kN for 24 hours, no deformation).
Sealing performance is verified via pressure testing (0.2MPa water pressure, no leakage for 1 hour).
Customization Service: Offers non-standard diameters (beyond 500mm) and material upgrades (e.g., 316L stainless steel) for special vessels (e.g., icebreakers, offshore platforms).
Installation Guidance: Provides 2D/3D drawings, on-site technical staff support, and video tutorials to ensure correct alignment and sealing.
After-Sales Maintenance: Offers 12-month warranties, with replacement parts (seals, bushings) delivered within 72 hours globally.
Compliance Certifications: Meets IMO (International Maritime Organization) standards and classification society requirements (ABS, DNV, CCS).
