What is a bushing?

A bushing is a type of bearing that provides a sliding interface between two parts, typically to reduce friction, vibration, and wear. It is also sometimes referred to as a sleeve bearing or plain bearing.

Here's some key information about bushings:

  • Function: Bushings primarily allow for relative motion between two parts, typically rotational or linear. They support loads and minimize friction during this movement.
  • Materials: Bushings can be made from various materials, including:
    • Metals: Bronze, steel, aluminum, and various alloys.
    • Plastics: Nylon, Teflon (PTFE), and other polymers.
    • Composites: Materials that combine different substances to achieve specific properties.
  • Types: Bushings come in various types, depending on the application and desired characteristics:
    • Solid Bushings: Simple, one-piece bushings.
    • Split Bushings: Bushings with a split or seam, allowing for easier installation and flexibility.
    • Flanged Bushings: Bushings with a flange on one end to provide axial support and prevent movement.
    • Self-Lubricating Bushings: Bushings made from materials that inherently reduce friction, often impregnated with lubricants like oil or graphite.
  • Applications: Bushings are used in a wide range of applications, including:
  • Advantages: Compared to some other types of bearings (e.g., ball bearings), bushings can be:
    • Less expensive.
    • More compact.
    • More tolerant of contaminants.
    • Able to handle shock loads better.
  • Disadvantages: Bushings generally have:
    • Higher friction than rolling-element bearings.
    • Higher wear rates in some applications.
    • Limited speed capabilities.

The selection of the appropriate bushing material and type depends on factors such as load, speed, temperature, lubrication requirements, and environmental conditions.