Free Online rolling bearing friction calculator

  • July 21, 2011
  • News

July 21, 2011 - Precision bearing manufacturer Schaeffler (UK) Ltd upgraded its rolling bearing calculation and simulation software, BEARINX, which now includes new functionality for calculating friction. Used early in the design process, BEARINX-online Easy Friction helps users to identify and maximise the potential for energy efficiency savings within a machine or system. For example, after using the software, the user may decide to specify rolling bearings with reduced friction characteristics, or to downsize the bearings and/or other related system components. Available online and free-of-charge to users and customers, the new BEARINX-online Easy Friction software module enables users to calculate the energy efficiency of different rolling bearing designs in any application. Users can pre-register now at http://BEARINX-online-easy-friction.schaeffler.com. Users will then receive an email notification as soon as the software module becomes available. Users will be able to conduct online calculations as of mid-2011 after initial registration. BEARINX-online Easy Friction takes into account the internal load distribution of the bearing and contact pressures on the raceways and ribs, with the actual rolling element profiles. The new software module utilises a friction calculation theory based on physical algorithms confirmed by a series of comprehensive values from tests on rolling bearings. Bearing life is calculated according to ISO/TS 16281. The software’s intuitive menu structure and navigational tools enable users to enter data quickly and easily for bearing modeling, bearing selection and operating conditions. The bearing design for an elastic shaft system, for example, can either be modeled with a locating/ non-locating bearing arrangement or as an adjusted bearing arrangement. The geometrical data of INA and FAG rolling bearings is uploaded automatically from an integral database. The user enters the operating data such as the loads on the shaft system, shaft speed, the internal clearance and axial preload of the rolling bearings. Lubrication and cleanliness details can also be specified. In addition, users can exchange any saved files with Schaeffler’s ‘Engineering Service’ department in order to produce an optimum bearing design. Powerful servers at Schaeffler then perform the actual bearing calculations. The most important results are displayed in a results window, with the input data and calculation results documented in a PDF file. Calculating friction with BEARINX Up to now, there were basically two methods of calculating the friction of rolling bearings – the catalogue method or by using special, multi-body simulation (MBS) programmes. The catalogue method uses an empirical approach, which enables calculations to be performed quickly using low model accuracy. MBS programmes, however, offer very high model accuracy but require longer calculation times. Schaeffler’s new method, which is based on physical bearing attributes, offers both fast calculation times and high model accuracy. The software considers a wide variety of influencing factors such as actual stress distribution and the internal geometry of the bearing. As well as load distribution and rating life, the software also enables users to calculate the frictional torque of rolling bearings and therefore the power loss of entire shafts or power transmission systems. This means it is possible to select a bearing concept with optimised friction characteristics early in the product development phase. The new friction calculation module takes into account both rolling and sliding friction, in solid body, mixed and fluid friction cases. Elasto-hydrodynamic theory (EHD) is at the core of friction calculations. This deals with the formation of a lubricant film in the contact points of bodies under high loads when rolling at high speeds. EHD theory includes the formation of a hydrodynamic lubricant film and elastic deformation of the contact bodies. Every single contact in the bearing is analysed, since stress, sliding speed, viscosity and temperature are not constant over the contact surface of a body. All frictional forces on the discreet points of the contact surface are then available in the calculation results. The Schaeffler Group with its product brands INA, LuK and FAG is a leading manufacturer of rolling bearings and linear products as well as a renowned supplier to the automotive industry of high-precision products and systems for engines, transmissions and chassis applications. The group of companies stands for exceptional customer focus, innovative ability and the highest possible level of quality. Sales of over 9.5 billion euros were generated at over 180 locations in more than 50 countries in 2010. With around 70,000 employees worldwide, the Schaeffler Group is one of the largest German and European industrial companies in family ownership.  

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