Under normal operation, a rotor levitated by magnetic bearings will rotate without making contact with any stator component. However, there are a number of circumstances that may lead to temporary or permanent loss of levitation. These include full rotor drop events arising from power loss, momentary fault conditions, sudden changes in unbalance, high levels of base acceleration, and other aerodynamically induced force inputs. The spinning rotor will come into dynamic contact with an auxiliary bearing. Highly localized and transient temperatures will arise from frictional heating over the dynamically varying contact area. Rotor dynamic contact forces are predicted for a range of initial conditions leading to combinations of bounce and rub motion on the auxiliary bearing. The transient heat flux from the contact area is then ascertained. A transient thermal Green's function is developed in a form that is effective over short or long time scales and local to the source. This enables the transient thermal response of an auxiliary bearing to be assessed for a range of dynamic contact conditions. Auxiliary bearings consisting of fixed bushings and free to rotate inner races are analyzed. The results show that significant localized contact temperatures may arise from each contact event, which would accumulate for multiple contact cases. The methodology will be of relevance for the life prediction of auxiliary bearing designs.
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Thermoplastic Housings Feature Stainless Steel Bearings
Thermoplastic housings with stainless bearings are just one of the new products featured in Rino Industries latest 848 page mechanical drive components' catalogue. This product has been added to the bearings range already offered by the precision engineered component's specialist, in order to further enhance the range on offer. The pillow block is made from a high quality, high-grade glass-filled thermoplastic polyester which is white in colour. The grease nipples and bearing are both stainless steel and the grease is food grade as standard making it ideal for those hygienic and clean-room environments. They are resistant to chemicals with an easily cleaned smooth surface and no coating or plating to crack or chip. It is made to suit shaft sizes 12mm to 35mm and is one of eight housing types available. Also available with economy insert bearings where required, just ask sales for a quote on price and availability.
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High Growth Forecasted for the World Bearings Market
LONDON, UNITED KINGDOM, Sep 02, 2008 (MARKET WIRE via COMTEX) -- Reportlinker.com announces that a new market research report related to the Industrial equipment industry is available in its catalogue. Global demand to rise 6.4% annually through 2012. Global demand for ball, roller and plain bearings is forecast to climb 6.4 percent annually through 2012 to $66.2 billion. Aftermarket sales gains will be limited by increases in average bearing life, reflecting the use of improved product designs, better-quality materials and better lubricants. However, growing demand for more expensive, better performing bearings will provide a counterbalance, supported in part by high energy prices, which are making highly efficient bearings a more attractive investment.
Gains to occur in both developing, developed areas. Product demand in developing parts of Asia/Pacific, Eastern Europe, Africa/ Mideast and Latin America will outpace sales in the US, Western Europe and Japan through 2012. Market advances in developing areas will be fueled by healthy economic growth, ongoing industrialization efforts and rising personal income levels, bolstering manufacturing output and fixed investment expenditures. In addition, higher living standards will help stimulate demand for automobiles and other bearing-containing durable goods, boosting both OEM and MRO bearing sales. China, India and Russia are expected to record some of the strongest gains, followed by lowervolume markets like Thailand, Indonesia, Malaysia and Romania.
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Bearings Market Projected to Reach $40 Billion by 2010
The market for bearings, a vital component of machinery in various industries, is directly related to industrial growth. Demand increases in sync with the level of industrial activity. Growth trends are closely linked to GDP trends as bearings are used in almost all engineered or capital goods sectors. Growing demand from developing economies particularly China, higher capital expenditure and automotive production exert a significant influence on demand. Major end-user industries such as automotive, consumer, agricultural, construction equipment, and steel and paper will continue to shape the fortunes of the sector. Ball bearings will retain their dominance as the largest product segment due to their widespread use in several applications.
Europe is the largest bearings market worldwide, worth an estimated US$9 billion for 2007 as stated by Global Industry Analysts, Inc. Asia-Pacific is the second largest regional market followed by the United States. Europe, Asia-Pacific, and United States together account for more than 70% share of the global bearings market. Ball bearings market is the largest and the fastest growing segment with sales projected to reach US$17 billion in the year 2009. Roller bearings market is projected to exceed US$15.5 billion by 2010 at a CAGR of over 5.5% during the 2001-2010 period.
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Drop-in replacement bearings
The latest range of plain bush bearings from Euro-Bearings have been designed as direct drop-in replacements for recirculating ball bushings as made by major manufacturers. These products offer designers a competitive and more versatile option for OEM installations, with high performance retro-fit replacement bearings for plant, maintenance and service engineers operating in a very wide range of industrial spheres Three types of bearings can be supplied including a stainless steel outer shell incorporating a ceramic core which is self lubricating. Aluminium assembly offers reduced weight
Euro-Bearings' rail and carriage motion guidance assembly uses a profiled aluminium rail with hardened bearing steel inserts on both the rails and aluminium carriages for the ball contact areas. Variations of these bearings with American FDA/USDA approvals are also available, making them suitable for installations involving food, drugs and pharmaceuticals production. The third range are ceramic coated bearings designed for the harshest operating conditions. All these bearings are low friction products which offer considerable advantages as well as economy. They can be used for high loads accommodating linear, rotary and even reciprocating movements. They are tough, quiet and resonance-free in operation and do not require lubrication. They can withstand washdown procedures and are also rugged enough for use in dirty or harsh environments. They can even be used with less precise shafting than the hardened stainless steel materials normally required. Bearings can be supplied as either fully closed or slotted types, with one of these being a self aligning product. Sizes are available to cover imperial shaft sizes from 0.2495 to 3.9988 inches diameter, with metric versions from 5 to 80mm diameter covering both European and Asian shaft standard sizes. All bearings are available ex-stock on short delivery and can be supplied either with or without seals.
