Plain bushes, also known as plain bearings, plain bearing bushes, or sleeve bearings, are simple yet effective types of bearings used to provide sliding or rotational motion between two surfaces. Unlike rolling-element bearings, plain bushes don’t employ balls or rollers. Instead, they typically consist of a cylindrical or flanged metal sleeve made from materials like bronze, brass, steel, or other suitable materials. The inner surface of the sleeve is typically lined with a lubrication layer, such as PTFE (polytetrafluoroethylene) or other self-lubricating materials, to reduce friction and wear. Plain bushes are used in various applications to support linear or rotational motion, reduce friction, and provide a low-maintenance, cost-effective solution. Here are the key features and characteristics of plain bushes:

1. Sliding Motion: Plain bushes facilitate sliding motion between two surfaces, typically a rotating shaft and a stationary housing or support.
2. Low Friction: The lubrication layer or material reduces friction, providing smooth and efficient motion.
3. High Load Capacity: Plain bushes can support high radial loads and, in some cases, moderate axial loads, depending on their design.
4. Simplicity: They are simple in design and construction, making them suitable for various applications where a straightforward bearing solution is required.
5. Low Maintenance: The self-lubricating properties of some plain bushes reduce the need for regular maintenance or external lubrication.

Plain bushes are used in a wide range of applications, including:

• Automotive: In suspension systems, steering columns, and control arms.
• Industrial Machinery: In conveyor systems, agricultural equipment, and hydraulic components.
• Construction Equipment: In heavy machinery like excavators and loaders.
• Household Appliances: In appliances like washing machines, dryers, and refrigerators.
• Aerospace: In aircraft landing gear, flight control systems, and engines.
• Marine Applications: In marine propulsion systems, steering mechanisms, and winches.
• Power Transmission: In gearboxes, couplings, and drive systems.

The selection of plain bushes involves considering factors such as load magnitude and direction, speed, temperature, and the specific environmental conditions in the application. Proper selection ensures that the plain bush can effectively meet the demands of the equipment and provide reliable performance and longevity.