What is journal bearing?

A journal bearing is a type of plain bearing that supports a rotating shaft or journal using a thin layer of lubricating oil or grease. It is widely used in various machinery and equipment applications, including automotive engines, industrial turbines, electric motors, and pumps.

The primary function of a journal bearing is to reduce friction and wear between the shaft and the bearing surface. The lubricating film between the two surfaces provides a barrier that prevents metal-to-metal contact, which can cause damage and failure.

Journal bearings come in different designs, including sleeve bearings, journal bearings with an oil groove and hole, and full-floating journal bearings. They can also be made from different materials such as bronze, plastic, or ceramic, depending on the application requirements.

One of the key factors that affect the performance of a journal bearing is the lubrication system. Proper lubrication is essential to maintaining the integrity of the lubricating film and preventing excessive wear and heat buildup.

Overall, journal bearings are widely used because of their ability to handle heavy loads, high speeds, and extreme operating conditions with minimal maintenance and long service life.