The primary function of a green bush is to act as a support for rotating or sliding parts, providing a durable surface that reduces the friction between moving components. By doing so, it helps prevent wear, heat generation, and damage to the components, increasing the overall efficiency and longevity of the system. Green bushes are often used in situations where traditional ball bearings or roller bearings may not be suitable due to space constraints, load demands, or cost considerations.

It is typically made from a composite material, such as bronze, and is impregnated with lubricants like oil or grease to enhance its wear resistance and reduce the need for external lubrication. Green bush bearings are commonly used in automotive, industrial, and heavy machinery applications, particularly in situations where high load-bearing capacity and low maintenance are required.