GB/T 14364-2008 Sliding Intermediate Bearing

GB/T 14364-2008 sliding intermediate bearing is an important component in mechanical transmission systems such as ship shafting, used to support the intermediate shaft. The following is a detailed introduction from the aspects of different types, characteristics, functions, etc.:

Main types

• Sliding intermediate bearing: As described in detail above, it uses oil film lubrication, the shaft and the bearing are in direct contact, and the oil film formed between the lubricating oil achieves low friction rotation. It is suitable for heavy loads, low speeds, and occasions with high requirements for noise and stability.

• Rolling intermediate bearing: It uses rolling elements (such as balls, rollers, etc.) between the inner and outer rings to achieve support and rotation. It has a small friction coefficient and small starting resistance, and can work at a higher speed, but its load capacity is lower than that of sliding intermediate bearings, and it requires higher installation accuracy. It is often used in shafting systems with high speed and accuracy requirements and relatively small loads.

Structural composition

• Bearing seat: Usually made of cast iron, cast steel or other high-strength materials, it is the basic support part of the bearing, used to fix the bearing and install it on the body or frame of the equipment, and bear various loads from the shaft and the outside.

• Bearing or rolling element assembly: The bearing of the sliding intermediate bearing is generally made of wear-resistant materials such as babbitt alloy, copper alloy, etc., which directly contacts the shaft to form a friction pair; the rolling intermediate bearing is composed of an inner ring, a rolling element and an outer ring. The rolling element rolls between the inner ring and the outer ring to realize the rotation support of the shaft.

• Lubrication and sealing device: The lubrication system includes lubricating oil supply pipelines, oil grooves, oil holes, etc. to ensure that the lubricating oil can be evenly delivered to the friction surface of the bearing; sealing devices such as sealing rings and oil seals prevent lubricating oil leakage and external impurities from entering the bearing.

Role and function

• Support shaft system: In the ship shaft system, the intermediate bearing supports the intermediate shaft so that the intermediate shaft can rotate in the correct position, ensuring the effective transmission of power from the main engine to the propeller, while bearing the radial load and part of the axial load of the shaft system, reducing the deformation and vibration of the shaft.

• Reduce friction and wear: By providing good lubrication conditions and suitable friction surfaces, the intermediate bearing can effectively reduce the friction coefficient between the shaft and the bearing, reduce wear, improve transmission efficiency, and extend the service life of the shaft and bearing.

• Buffering and vibration reduction: It can absorb and buffer the vibration and impact generated by the shaft system during operation, reduce the impact of vibration on other parts of the equipment, improve the stability and stability of the entire system, and protect important equipment such as the main engine and propeller.

• Adjust the shaft system alignment: During the installation and commissioning process, the intermediate bearing can be used to adjust the alignment of the shaft system, ensure the coaxiality between the shaft sections, enable the shaft system to operate smoothly, and reduce the additional stress and wear caused by misalignment.

Maintenance points

• Regularly check the lubrication system: Check the oil level and oil quality of the lubricating oil, ensure that the cleanliness and viscosity of the lubricating oil meet the requirements, replace the lubricating oil on time, and prevent the bearing from being worn due to poor lubrication.

• Monitor the bearing temperature: Pay attention to the operating temperature of the bearing through the temperature monitoring device or regular touch inspection. If the temperature rises abnormally, it may be a lubrication problem, improper installation or damage to the bearing itself. The cause needs to be promptly investigated and handled.

• Check the bearing clearance: Regularly measure the clearance of the bearing, including radial clearance and axial clearance, to ensure that the clearance is within the specified range. Too large or too small a clearance will affect the performance and life of the bearing. Adjust or replace the bearing if necessary.

• Check the sealing condition: Check whether the sealing device is intact and whether there is any lubricating oil leakage. Replace aging or damaged sealing rings, oil seals and other sealing parts in time to prevent lubricating oil leakage and impurities from entering the bearing.