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.