Miniature linear recirculating ball bearing and guideway assemblies (MAI 81)
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Linear bearings for the miniature applications sector require a dif-ferent approach in the design of guidance systems. While normal criteria such as load carrying capacity, rigidity and operating life are important, the additional factor of size also applies for minia-ture bearing arrangements. However, simply scaling downӔ thestandard sizes to smaller dimensions is not very successful intechnical terms. INA has therefore developed its four-row miniature linear ball bearing and guideway assembly KUME..C. For applications with a lower requirement for load carrying capacity, this high-performance guidance system is supplemented by a two-row guidance system. > Two-row linear recirculating ball bearing andguideway assemblies These units have moderate load carrying capacity,the moment load carrying capacity is moderate to high.Their modular construction allows the exchange ofguideways and carriages within one interchangeability and accuracy class. This gives simpler fitting of guidance systems, easier sourcing of replacement parts and allows very economical stockholding.The saddle plates and guideways are corrosion-resistant. Seals on the end faces of the carriages protect the rolling element system against contamination. The carriages are greased and can be relubricated. The guideways and carriages are also available in a wide version. Four-row linear recirculating ball bearing and guideway assemblies Four-row miniature linear recirculating ball bearing and guideway assemblies KUME..C are established, ready-to-fit guidance systems for unlimited stroke lengths. They have high load carrying capacity and rigidity.Due to the lubricant reservoir in the carriages, they are maintenance-free in many applications. Applications These linear recirculating guidance systems are particularly suitable for applications: in the microelectronics industry andrelated sectors in optical equipment in medical equipment in textile machinery that require high speeds andvery uniform running behaviour where particularly economical miniature guidance systems areneeded for moderate to high load requirements and moderate to high rigidity requirements. > 173 626a

FeatureMiniature ball bearing andguidewayassembly Characteristic Dimensions/cross-section Load carrying capacity and rigidity Linear locating bearing for unlimited stroke lengths > 173 673 Comprising guideway TKDMand carriage KWEM Two-row, four point contact of rolling elementswith raceways > Can support loads from all directions except for the direction of motion ֖ and moments about all axes Preloaded Seals on end faces of carriages > Greased, can be lubricated with oil or grease Also available as long version Moderate to high > Linear locating bearing for unlimited stroke lengths > 173...

FeatureMiniature linear guidance system Characteristic Load carrying capacity Rigidity Information > Linear locating bearing for unlimited stroke lengths Comprising guideway and carriage, not preassembled Two-row, four point contact of rolling elementswith raceways Preloaded Seals on end faces of carriages Greased, can be lubricated with oil or grease Interchangeable Moderate to highModerate to highMAI 81 > 173 668a Linear locating bearing for unlimited stroke lengths Comprising guideway and carriage Four-row, two point contact of rolling elementswith raceways Preloaded With lubricant...

Two-row miniature linear recirculating ball bearing and guideway assemblies corrosion-resistant KWEM..(W) / TKDM..(W) > M k ֋C 18ږ23 1414 > 173 634 Accessories > 173 649 173 652b sealing strips for carriages grease injector for greasing of carriages >

CN Basic dynamic load rating ( dimension table )C Design and safety guidelinesLoad carrying capacity and life > > NBasic static load rating ( dimension table )HmmDistance between ends of strokeLmmBasic rating life in 100000mL The size of the guidance unit is determined by the load carrying capacity of the individual elements. The load carrying capacity is described in terms of the basic dynamic load rating C and basic static load rating C > ( dimension table ). > h hBasic rating life in operating hoursMNmEquivalent static moment in load directionM Basic rating life The basic rating life is...

Interchangeability The guideways and carriages can be used in any combination within the same accuracy and interchangeability class.This has the following benefits: > 1 economical stockholding simple spare parts sourcing straightforward installation.The preload class is determined by the carriage. Delivered condition The carriage and guideway are not supplied pre-assembled (Figure 1).There is a plastic dummy guideway in the carriage. This guideway prevents damage to the rolling element set while the carriage is separate from the guideway.The carriages are greased. > 2 3 Corrosion-resistant...

Hole patterns of guideways The guideways have a symmetrical hole pattern (Figure 5 and Figure 6). With an asymmetrical hole pattern (customer request), the following must be adhered to: > a L j L RL = aa 1 a > L a > Lmin and a > R a > Rmin (Figure 5, Figure 6). Maximum number of pitches between holes The number of pitches between holes is the rounded whole number equivalent to:The distances a > a L j L RL aa () 2ַ a > 2 nl --------------------------------------------= > max Lmin j > L L and a > R are generally determined by:For guideways with a symmetrical hole pattern:Number of holes: a >...

Demands on the adjacent construction The design of the bearing arrangement is essentially deter-mined by the requirements for accuracy, rigidity and load carrying capacity of the bearing arrangement. This has a direct influence on the adjacent construction and primarily concerns: the geometrical and positional accuracy of the mounting surfaces > H Not convex(for all machined surfaces) Not convex(for all machined surfaces) the location of the guidance elements.Ensure that the adjacent construction has adequate strength. > AAA Geometrical and positional accuracy of the mounting surfaces...