FEATURE BEARINGS, SEALS & GASKETS


hoW has beaRing design changed oVeR the yeaRs?


Simple yet sophisticated, the humble ball bearing is arguably one of the greatest technological developments of all time. However, the story is far from written… Chris Johnson, managing director at SMB Bearings, reflects on the history of the bearing and three exciting developments that have gripped the industry


B


earings are used in virtually all types of rotating machinery. From defence and aerospace equipment to food and beverage production lines, the demand for these components is rising. Design engineers are increasingly demanding smaller, lighter


and more durable solutions to satisfy even the most testing of environmental conditions. It’s therefore no surprise that the global bearings market size*


2020 and is expected to expand at a compound annual growth rate (CAGR) of 8.5% from 2021 to 2028.


Rolling back the clock


Despite modern day abundance, the invention of the ball bearing actually dates back to Ancient Egyptian times. Egyptian art is said to depict roller bearings, often made out of tree trunks, acting as rollers under sledges carrying an object. Although a far cry from the bearings we use today, the purpose remains the same. Leonardo Da Vinci is credited with inventing the ball bearing around the year 1500 – he designed the component to lower the friction between two plates that would be in contact in his famous design for a helicopter. It wasn’t until 1794, however, that the first modern recorded patent for ball bearings was awarded to Philip Vaughan, a Welsh inventor and ironmaster. The 1900s represent a real turning point in the history of bearings.


In 1917, bearing manufacturers in the US came together to form ABMA (American Bearing Manufacturers Association). The ABMA created the global numbering system which is still followed today as a worldwide standard for bearings. This standardised bearing vocabulary empowered manufacturers to experiment with new bearing technology, materials and lubrication methods.


MateRials science


Reducing friction is a key area of research for manufacturers. Many factors affect friction – such as dimensional tolerances, surface finish, temperature, operational load and speed. However, significant advancements have been made in bearing steels over the years. Modern, ultra-clean, bearing steels contain fewer and smaller non- metallic particles, giving ball bearings greater resistance to contact fatigue. Modern steel making and de-gassing techniques produce steel with lower levels of oxides, sulphides and other dissolved gases, while better hardening techniques produce harder and more wear-resistant steels. Advances in manufacturing machinery enable manufacturers of precision bearings to maintain closer tolerances in bearing components and produce more highly polished contact surfaces, all of which reduce friction and improve life ratings. New 400 grade stainless steels (X65Cr13) improve bearing noise


levels as well as high nitrogen steels for greater corrosion resistance. For highly corrosive environments or temperature extremes, customers can now choose from a range of 316 grade stainless steel bearings, full ceramic bearings or plastic bearings made from acetal resin, PEEK, PVDF or PTFE. As 3D printing becomes more widely used, and therefore more cost-effective, we see increasing possibilities for production of non-standard bearing


24 DESIGN SOLUTIONS JULY/AUGUST 2021 was valued at USD 118.7 billion in


retainers in small quantities, something that will be useful for low volume requirements of specialist bearings. Lubrication may have garnered the most attention. With 13%


of bearing failure attributed to lubrication factors, bearing lubrication is a fast-evolving area of research, supported by academics and industry alike. There are now many more specialist lubricants thanks to a number of factors: a wider range of high-quality synthetic oils, a greater choice of the thickeners used in grease manufacture, and a greater variety of lubricant additives to provide, for example, higher load capabilities or greater corrosion resistance. Customers can specify highly- filtered low noise greases, high speed greases, lubricants for extreme temperatures, waterproof and chemically-resistant lubricants, high-vacuum lubricants and cleanroom lubricants. While design engineers have long searched for ultra-low friction


bearing technologies to reduce wear and prevent corrosion, graphene material coatings are being developed that dramatically reduce friction compared to the lubrication and surface treatment options that are currently on the market.


coMputeRised analysis


Another area where the bearing industry has made great strides is through the use of bearing simulation software. Now, bearing performance, life and reliability can be extended beyond what was achieved a decade ago without undertaking expensive time-consuming laboratory or field tests. Advanced, integrated analysis, of rolling element bearings can give unrivalled insight into bearing performance, enable optimal bearing selection and avoid premature bearing failure. Advanced fatigue life methods can allow the accurate prediction


of element and raceway stresses, rib contact, edge stress, and contact truncation. They also allow full system deflection, load analysis and bearing misalignment analysis. This will give engineers the information to modify the bearing design to better accommodate the stresses resulting from the specific application. Another clear advantage is that simulation software can


reduce the amount of time and resources spent on the testing phase. This not only speeds up the development process but also reduces the expenses in the process. It’s clear that new materials science developments along with


advanced bearing simulation tools will provide engineers with the insight required to design and select bearings for optimum performance and durability, as part of a whole system model. Continued research and development in these fields will be crucial in ensuring bearings continue to push the boundaries in the years to come.


SMB Bearings T: 01993 842555 www.smbbearings.com


* https://www.grandviewresearch.com/industry-analysis/bearings-market


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