Design Principles

The design principle of plain bearings is based on the sliding motion between two contacting surfaces. These bearings do not have rolling elements, such as balls or rollers. Instead, they rely on lubrication between the sliding surfaces to reduce friction and wear. Plain bearings typically consist of two parts: a fixed housing (or seat) and an internal sliding surface, which is often referred to as a bearing bushing or journal bearing.

Performance Features

The performance features of plain bearings include:

• Self-lubrication: Many plain bearings are designed to be self-lubricating, reducing maintenance needs by incorporating lubricants or using bearing bushings made from lubricating materials.
• Vibration Absorption: Due to the absence of rolling elements, plain bearings can absorb and dampen vibrations.
• Quiet Operation: The operation of plain bearings is typically quieter than that of rolling bearings.
• Simple Structure: The structure of plain bearings is relatively simple, and they are generally less expensive to manufacture and install.
• High Load Resistance: Certain types of plain bearings can withstand high loads.
• Corrosion and Chemical Resistance: Depending on the materials used, plain bearings may offer good resistance to chemical corrosion and extreme environments.

Application Scenarios

Plain bearings are suitable for a variety of scenarios, including:

• Slow or Intermittent Motion: Plain bearings are particularly effective in applications with slow movement or with stopping and starting.
• High Load Applications: In applications bearing high loads, such as bridge supports, heavy machinery, and industrial equipment.
• Corrosive Environments: In chemical processing facilities, marine applications, or other environments that could cause metal corrosion.
• Inaccessible Maintenance Locations: In places where routine maintenance is difficult, self-lubricating plain bearings can reduce the need for maintenance.
• Aerospace: In some aerospace applications, plain bearings are used to absorb loads and vibrations.

When selecting plain bearings, it is crucial to consider lubrication requirements, load capacity, working environment, and cost-effectiveness.