Plain Journal Bearings

Plain Journal Bearings

Plain journal bearings, also known as sleeve bearings, are a type of bearing that supports a rotating shaft with a cylindrical surface. They are widely used in various applications, including machinery, automotive, and aerospace industries. Plain journal bearings operate by creating a thin layer of lubricant between the rotating shaft and the bearing surface, which reduces friction and wear. The lubricant can be a liquid, such as oil or water, or a solid, such as graphite or Teflon. Plain journal bearings can be made of various materials, including bronze, brass, steel, and plastic. They can also have different configurations, such as split bearings, flanged bearings, and thrust bearings. The selection of the bearing material and configuration depends on the application requirements, such as load capacity, speed, temperature, and environment. One of the advantages of plain journal bearings is their simplicity and low cost. They do not require complex lubrication systems or maintenance, and they can operate in a wide range of conditions. However, they also have some limitations, such as limited load capacity, limited speed capability, and potential for overheating and failure if the lubrication is inadequate or contaminated. In summary, plain journal bearings are a type of bearing that supports a rotating shaft with a cylindrical surface by creating a thin layer of lubricant between the shaft and the bearing surface. They are simple, low-cost, and widely used in various applications, but they also have some limitations and require proper lubrication and maintenance.

sleeve bearings, lubrication, load capacity, speed capability, maintenance

— John Lewis

CITATION : "John Lewis. 'Plain Journal Bearings.' Design+Encyclopedia. https://design-encyclopedia.com/define/plain-journal-bearings?E=401155 (Accessed on October 14, 2026)"