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Applications of mechanical systems and technology
Published in Alan Darbyshire, Charles Gibson, Mechanical Engineering, 2023
Alan Darbyshire, Charles Gibson
Plain bearings are best suited to low rotational speeds and steady loads. It is essential that they are adequately lubricated with a relatively low-viscosity oil. This is usually delivered under pressure in a re-circulating oil system. The oil also carries away heat and maintains the bearing at a steady temperature. Very often a spiral groove, leading from the oil passage, is cut in the internal bearing surface to ensure even distribution of the oil.
Lubrication and Wear
Published in Neville W. Sachs, Practical Plant Failure Analysis, 2019
Earlier in the chapter we wrote, “There is some frictional heating in a plain bearing and, as the oil grows hotter the viscosity decreases and the leakage out the ends of the bearing increases”. When a plain bearing is more heavily loaded, it will develop more frictional heat. That will decrease the oil viscosity and increase the leakage rate, but as long as there is adequate feed to the bearing, the bearing will support the load. (Calculating the heat generation and resultant viscosity is very complicated and beyond the scope of this text.)
Bearings, Slides, Guides, Ways, Gears, Cylinders, Couplings, Chains, Wire Ropes
Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017
Don M. Pirro, Martin Webster, Ekkehard Daschner
Plain bearing materials most often encountered in industrial machines are bronzes and babbitts. Suitable bronzes and babbitts are available for practically all conditions of speed, load, and operating temperature encountered in general practice. Steel and cast iron are used for a limited number of purposes, usually involving low speeds or shock loads. There has been considerable growth in the use of plastic and elastomeric materials such as nylon, thermoplastic polyesters, laminated phenolics, PTFE, and rubber for bearings, particularly in applications where contamination of, or leakage from, oil-lubricated bearings might result in high maintenance costs or short bearing life. Some of these materials can be lubricated with water or soluble oil emulsions in certain applications. Allowable unit loads for these bearing materials usually are lower, although in a number of cases, nylon-filled bearings have been used as direct replacements for bronze bearings.
Investigation of Dry Sliding Friction Wear Behavior of CuSn11 Bronze Plain Bearing Applying Impregnated Graphite-Filled PTFE
Published in Tribology Transactions, 2022
Increases in friction and wear, as well as high temperatures, are undesirable on the friction surfaces of plain bearing systems due to the loss of energy and reduced system efficiency. The desired and expected properties for plain bearings are a lower friction coefficient, strong wear and corrosion resistance, embedding foreign particles, good thermal conductivity, easy processability, and low cost (1). The fulfillment of these expectations especially depends on the tribological properties, including operating conditions and the selection of the optimal bearing material (1, 2).
The Effect of Heat Treatment on the Performance of Antiwear Steel Coatings Deposited on AISI 1015 Steel Substrates
Published in Tribology Transactions, 2021
Sandro C. Silva, Luiz L. Silva, Marcelo A. Câmara, Paulo César M. Rodrigues, Alexandre M. Abrão
Tamping machines are widely used to level and align the railway track to its original position by redistributing the ballast under the sleeper (7). Such equipment contains plain bearings subjected to wear by abrasion, especially when lubrication is not efficiently applied. This work aims to replicate the working conditions to which the plain bearings of tamping machines are subjected to investigate the phenomena associated with the performance of this group of bearings.