What is a bi-metal bearing made of?

Bimetal bearings are composed of two different metal layers that are bonded together. The two main components are:

1. Back Metal Layer:

  - The back or base metal layer provides the main structural support and strength to the bearing. It is typically made of a strong and durable material that can withstand heavy loads and wear. Common materials for the back layer include:

    - Steel: Carbon steel or other alloyed steels are often used for the back layer due to their strength, hardness, and load-bearing capacity.

2. Overlay Layer:

  - The overlay layer is the top layer that comes into direct contact with the shaft or journal. This layer is specifically chosen for its anti-friction and wear-resistant properties. Various materials can be used for the overlay layer, and the selection depends on the specific application and requirements. Some common overlay materials include:

    - Bronze: Often used as the overlay material due to its self-lubricating properties, good heat dissipation, and resistance to corrosion.

    - Aluminum: In some cases, aluminum alloys may be used for the overlay layer, offering good anti-friction properties.

The combination of a strong back metal layer and a wear-resistant overlay layer results in a bimetal bearing that can handle heavy loads, provide good wear resistance, and maintain reliable performance over time. Bimetal bearings are commonly used in various industrial applications, such as automotive engines, agricultural machinery, and other equipment where reliable and durable bearings are essential.