Timken - SNT Plummer Block

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SNT SPLIT PLUMMER BLOCKS Mounting MOUNTING Adapter vERSUS Straight Bore Typically, a spherical roller bearing plummer block assembly is mounted on a straight shaft using a tapered bore bearing and adapter assembly. Standard commercial shafting can be used without additional machining. (Suggested shaft diameters are shown in table E-20 on page E-68.) Adapter mount also permits maximum flexibility in the axial positioning of the bearing on the shaft and will accommodate light locational thrust loads. Timken plummer blocks for tapered bore and cylindrical bore are available. Adapter-mounted spherical roller bearings require the correct removal of diametral clearance from the bearing to prevent relative rotation between inner race and sleeve or shaft. For proper shaft mounting of adapter-type spherical roller bearings, see page E-7. When application conditions produce heavy thrust loads, or a need exists for exact axial location or a positive shaft interference fit, a direct straight bore mounting may be the best option. This requires a shouldered shaft, machined for proper fit, and a straight bore bearing. Timken plummer block housings for straight bore applications are available for use with series 213, 222, 223 and 232. Suggested fits for shafts in cylindrical bore spherical roller bearings are shown in the engineering section of this catalog in table E-4 on page E-9. For applications involving heavy shock, vibration, unbalanced rotating loads or other non-standard conditions, consult your Timken engineer. Closed-End Installations In some applications, the shaft end is designed to terminate inside the plummer block. For this design, positive fitting end-cap inserts are available to help seal out contaminants and retain lubricant. Timken heavy-duty end covers provide sealing for closed-end applications. Designers and installers need to make sure the shaft end does not contact the closure. A minimum of 3 mm clearance at maximum thermal expansion is suggested between the end of the shaft and the closure. Dimension Y, in the spherical roller bearing tables (pages E-71 – e-77), defines the maximum permissible length of the shaft from the centerline of the plummer block housing. Note Failure to employ proper mounting procedures can cause reduced bearing performance. Fixed and Float Plummer Blocks SNT split plummer block components include two to six locating rings allowing for installation at either fixed or float positions on the shaft. For the fixed position, two or more locating rings are used on one or both sides of the bearing. E-38 TIMKEN ® HOUSED UNIT CataloG • Download 3D Models and 2D Drawings at cad.timken.com
SNT SPLIT PLUMMER BLOCKS SNT LUBRICATION • SEALS SNT LUBRICATION Timken plummer block housings are designed for grease lubrication. They also can be modified to accommodate oil-bath and circulating oil- or oil/air-mist systems. Contact your Timken engineer for assistance. Please reference the installation guides on pages E-41 – E-45 for grease fill information. Lubrication groove and holes may be provided in the bearing outer ring. This feature, designated by adding suffix W33 to the bearing number, should be specified whenever re-ordering bearings for pillow blocks. For bearings with lubrication groove and holes, it is suggested that the fresh lubricant is fed directly to the center of the bearing between the rows of rollers and distributed to the rest of the bearing. This helps ensure the used lubricant is purged from the bearing. Housed units feature multiple dimples that can be used to drill and tap for alternative grease fitting locations as needed. SEALS Timken ® SNT plummer blocks are available with multiple sealing options. Each seal type incorporates specific features to meet your application needs. Table E-18 compares the various features of each seal type. Double-Lip Seals Double-lip seals are the most common seal design used with SNT plummer blocks. These are general all purpose elastomer seals that can protect in moderately contaminated environments. The seal is split into two 180 degree halves for easy installation. The seal element runs against the shaft surface and should be used in grease lubricated blocks. Contact your Timken engineer for double-lip seal availability when using cylindrical bore housings. Fig. VR E-15. V-ring seals. V-Ring Seals Fig. TSNG E-14. Double-lip seals. V-ring seals are a deflector type seal. They are made up of an elastomer V-ring seal element that rotates with the shaft and runs against the axial surface of a washer-type component that is retained in the block housing. As the V-ring element is a stretch fit onto the shaft, a rougher shaft surface is acceptable. This seal performs well in moderately contaminated environments with fine particulate. Labyrinth Seals Labyrinth seals are made up of a single metal ring component that interconnects with the grooves in the housing to form a labyrinth gap. The inside diameter of the metal ring contains an O-ring that creates an interference fit with the shaft so that the ring will rotate with the shaft. Labyrinth seals can be used on high-speed applications and in moderately contaminated environments. Fig. E-16. LO Labyrinth seals. Taconite Seals Taconite seals are a combination of both a labyrinth seal and V-ring seal. The labyrinth seal is made up of two separate metal ring components, inner and outer, that have interconnecting grooves that form a labyrinth gap. The outer metal ring component contains an O-ring on its outside diameter that provides an interference fit to the groove in the housing. The inside diameter of the inner metal ring component contains an O-ring that creates an interference fit with the shaft so that the ring will rotate with the shaft. This seal performs well in highly contaminated environments such as those seen in mining operations. Fig. E-17. Taconite TA seals. TIMKEN ® HOUSED UNIT CataloG • Download 3D Models and 2D Drawings at cad.timken.com E-39
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Page 6 and 7: INTRODUCTION HOUSED UNIT OVERVIEW R
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SNT Spherical Roller Bearing METRIC
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TIMKEN INDEX Index Timken ® SNT PL
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Timken - SNT Plummer Block

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