![]() ![]() This lubrication barrier also provides damping characteristics when passing through rotor-critical speeds, allowing for stable equipment operation.Ī journal bearing is easier to remove and repair given the split design. ![]() Theoretically, a journal bearing may have an infinite life since there is no contact between the bearing surface and journal. The lubrication forms a protective barrier between the shaft and Babbitt surface while also removing friction-generated heat and debris from the bearing. Journal bearings are quite strong and can carry heavy loads as long as they are lubricated properly. This allows for machine operation at higher temperatures, which often result from heavier loads and faster speeds. Table 1 shows some of the physical properties of the most common forms of Babbitt classifications in industry.Īlthough tin enters the liquid phase near 450 degrees F, the liquid phase for the Babbitt alloy microstructure does not occur until temperatures exceed 600 degrees F. The standard Babbitt alloy is comprised primarily of a solid matrix of tin with various amounts of antimony cuboids and/or copper threads. These alloy formulations became so popular that the name “Babbitt” has become synonymous with the material. In 1839, Isaac Babbitt patented a bearing alloy similar to the material used today. Bells were often formed with a bronze alloy that usually included a 4-to-1 mix of copper and tin. In the 17th century, Robert Hooke began utilizing “bell” metal as a bearing surface material. ![]() The bearing surface is sacrificed, with Babbitt actually becoming the lubricant, and the shaft surface is preserved in case there is a loss of lubrication or other operating anomaly. The soft material is resistant to galling but easily wears away, protecting the harder surface of the typically steel shaft. This material has a smooth, slick surface that is easily wetted by liquids. Most journal bearings found in modern industrial equipment are built with a surface of Babbitt material. ![]()
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