CB769-2008 Marine Integral Rubber Bearing

Marine integral rubber bearings are important components in the ship's shafting system. The following is a brief introduction:

Structural features

• Integral vulcanized structure: usually composed of a metal shell and a rubber lining vulcanized inside it. The rubber and metal shell are tightly combined through the overall vulcanization process to form an integral bearing structure that can effectively transfer loads and has good integrity and stability.

• Rubber lining: It is a key part of the bearing. It generally uses a specially formulated rubber material with good elasticity, wear resistance, water resistance and corrosion resistance. The thickness of the rubber lining varies depending on the specifications and use requirements of the bearing, usually between 10 mm and 50 mm.

• Metal shell: generally made of cast iron, cast steel or stainless steel, it provides support and fixation for the rubber lining, and is also connected to the stern tube or other components of the ship. The surface of the metal shell is usually processed to ensure the bonding quality and installation accuracy with the rubber lining.

• Lubrication channel: In some marine integral rubber bearings, special lubrication channels or oil grooves are designed to introduce lubricating media such as lubricating oil or water to reduce the friction coefficient and improve the lubrication performance and service life of the bearing.

Working principle

• Support and buffering: The elasticity of rubber can effectively support the stern shaft and propeller of the ship and other components, bear the radial load and axial load from the shaft system, and buffer the vibration and impact generated by the ship during operation, reducing the impact on the hull structure.

• Water lubrication or oil lubrication: According to different use requirements, water lubrication or oil lubrication can be used. Under water lubrication conditions, when the bearing is working, water will form a layer of water film between the rubber lining and the stern shaft, which plays a role in lubrication and cooling, reducing friction loss; oil lubrication is achieved by forming an oil film between the two. Oil lubrication has better lubrication effect and can withstand higher loads, but it needs to be equipped with a corresponding oil lubrication system.

• Sealing effect: The rubber lining has good sealing performance, which can prevent seawater or lubricating oil from leaking and ensure the normal working environment of the bearing. In water-lubricated bearings, seawater can be prevented from entering the hull; in oil-lubricated bearings, lubricating oil can be prevented from leaking to the outside to avoid pollution to the marine environment.

Application advantages

• Good wear resistance: The rubber material has high wear resistance, which can resist the friction between the stern shaft and the bearing during long-term use, reduce wear, and extend the service life of the bearing.

• Low noise and low vibration: The elasticity of rubber can effectively absorb and isolate vibration and noise, making the ship quieter and more stable during operation, improving the comfort of the ship and the quality of the working environment.

• Corrosion resistance: The rubber material has good corrosion resistance to seawater, etc., can maintain good performance in harsh marine environments, and is not easily damaged by corrosion.

• Easy installation: The integral structure makes the installation of the bearing relatively simple. It only needs to be correctly installed on the stern tube or other corresponding positions of the ship, reducing the workload and difficulty during the installation process.

Scope of application

• Small ships: such as small fishing boats, yachts, inland transport ships, etc., marine integral rubber bearings can meet the support and lubrication requirements of their shafting, and have good cost performance and stability.

• Medium-sized ships: They are also widely used in some medium-sized ships, such as coastal cargo ships and engineering ships. According to the specific load and use conditions of the ship, the integral rubber bearings with appropriate specifications and performance can be selected.

• Ships with high requirements for noise and vibration: such as passenger ships, scientific research ships, ocean monitoring ships, etc. The low noise and low vibration characteristics of marine integral rubber bearings can meet the requirements of these ships for comfort and working environment.