Seal Lubrication Seal Several types: depending on service requirements 2-Cap Bolts some types have 4 Dowel Pins for correct mounting of cap 4 - mounting Bolt Holes some types have 2 or blank base when required. Among other enhancements, the housings have increased stiffness making them even more insensitive to uncontrolled and excessive tightening of the attachment bolts. SNL SNH pillow blocks of cast iron with either self-aligning double roll ball bearing for normal loads or self-aligning spherical roller bearing for heavy loads. A variety of different sealing arrangements are available. SSNHD Standard SAF pillow blocks are made of cast iron with either self-aligning double row ball bearings for normal loads or self-aligning spherical roller bearings for heavy loads.
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Seal Lubrication Seal Several types: depending on service requirements 2-Cap Bolts some types have 4 Dowel Pins for correct mounting of cap 4 - mounting Bolt Holes some types have 2 or blank base when required. Among other enhancements, the housings have increased stiffness making them even more insensitive to uncontrolled and excessive tightening of the attachment bolts. SNL SNH pillow blocks of cast iron with either self-aligning double roll ball bearing for normal loads or self-aligning spherical roller bearing for heavy loads.
A variety of different sealing arrangements are available. SSNHD Standard SAF pillow blocks are made of cast iron with either self-aligning double row ball bearings for normal loads or self-aligning spherical roller bearings for heavy loads. Standard with triple ring seal. Alternative sealing arrangements such as taconite or contact seals are available.
SAFS: Same features, cast in steel. Supplied in ductile iron as standard and stronger than the old designs. These new housings will accommodate the old designs.
The new housings will accommodate the standard LER triple ring seals and in addition, a new taconite service seal can be used with the same housing. Increased load capacity can be provided by specifying the series bearing for which the new block has been designed as well as the series.
A variety of sealing arrangements are available but the D and E type seal are considered the standard. Excellent for extreme abrasive materials for instance taconite dust. SDAF pillow blocks can also be supplied in cast steel. Consult SKF for availability. The standard sealing arrangement is the triple ring seal. Canadian designed heavy duty pillow block is made of ductile iron to complement the well proven SD design.
Sealing features are the same as the SD pillow block. For extreme operating conditions D and E type labyrinth seals are standard. Excellent for abrasive materials i. These pillow blocks can also be supplied in cast steel. The bearing seating of the housings is machined to tolerances such that a loose fit of the bearing outer ring is assured and in most cases the seating width is such that the bearing has axial freedom.
Dimensional inaccuracies, slight positioning errors in mounting, and thermal elongation of the shaft can be accommodated in the pillow block housing itself. Axial location of the bearings is achieved by inserting the fixing rings specified in the housing tables. If only one ring is to be used with a bearing having an adapter sleeve, the fixing ring should be positioned on the same side of the bearing as the locknut. The bearing is then displaced from its centre position in the housing by the distance equal to half the fixing rings and their designation should be stated.
Pillow block housings shown in the housing tables are horizontally split and are designated for use with selfaligning ball bearings and spherical roller bearings with either a tapered bore and mounted on an adapter sleeve or with a cylindrical bore. The elongated slotted bolt holes in the housing base permit slight adjustments to be made to the position of the pillow block.
The housings are fitted with dowel pins, or the mating surfaces may be stepped to ensure correct location of the associated caps and bases, which are NOT interchangeable. For the flatness IT7 is recommended. When the demand is lower, IT8 can be used. Comparison of Physical Properties of Typical Pillow Block Housing Material SKF pillow blocks are usually made of cast iron and are mainly intended for grea se lubricated ball or roller bearings.
For extra heavy duty applications, ductile iron or cast steel pillow blocks are available. Where conditions such as high thrust loads, shock loads, extreme temperatures an d speeds prevail, consult SKF for detailed recommendations.
See page 2. SAF Pillow block split design inch overall dimensions North American standard used for inch shafting. Variety of sealing arrangements available, see Page 8. Variety of sealing arrangements available see Page 8. Used for inch shafting variety of sealing arrangements available, see Page 8. Current standard product. For reference only. Consult SKF for availability and technical specifications. Pillow block split design inch overall dimension can be used for metric or inch shafting.
Available with variety of sealing arrangements see Page 9. The many alternative choices available ensure that a correct or most suitable solution will be found to meet the condition surrounding a particular application. If a contact rubbing seal is selected, care must be taken with regard to the surface finish of the shaft. It is recommended that the shaft surface roughness does not exceed RMS t The split design simplifies mounting. The maximum permissible misalignment of the shaft is approximately 1 up to shaft diameters of mm 3.
Double-lip seals are designated TSN followed by the housing number and suffix G, ie. TNS G. V-Ring seals, Type A. The V-Ring, of Nitrile rubber, has a thin sealing lip which functions in an axial direction.
The ring also acts as a flinger as it rotates with the shaft. This type of seal can be used for both grease and oil lubrication and is extremely effective under most operating conditions including high speeds and shafts with rough sealing surfaces.
The maximum permissible misalignment of the shaft is approximately 1. For a shaft diameter of 50mm, and approximately 1 for shaft diameter of mm. For SNL pillow block housings, the V-rings seal against sheet metal washers which are coated with a rust inhibitor.
Each washer has a rubber lip, bonded around its periphery which locates and seals in the housing groove. Pillow block housings of series SNL 5 and SNL 6 are available with split felt seals consisting of oiled felt incorporated in halves of a light alloy ring, the seal halves are fitted into the housing grooves, the O-section cords provide an effective seal between the housing hub bore and the outside diameter of the seal inserts.
Misalignment exceeding 0. The sliding fit of the rotating seal ring on the shaft ensures that it will automatically find its own proper location relative to the stationary hub grooves. For larger shaft diameters an O-sectioned cord is inserted between the seal ring and the shaft to ensure ring rotation and avoid possible lubricant leakage. The maximum permissible misalignment between shaft and housing must be restricted to 0.
Labyrinth Seals Type D and E Extreme service seals of D and E types were initially developed for the mining industry, where fine abrasive dusts were prevalent e. They are most commonly used in the SDCD and SNL series of housing which have additional grease fitting allowing the seals to be periodically purged. Their design offers the distinct advantage that housing caps may be removed for maintenance inspection of bearings with the seals remaining undisturbed. These seals available on special order only.
Preparation before Mounting Position the adapter sleeve less locknut and lockwasher on the shaft in the correct position for the proposed bearing Check shipment and make certain all assemblies are mounted center line. A light smear of spindle oil applied to the complete, and no short shipping has occurred on components. The bearings should be left in their original packages until immediately before mounting so that they do not become dirty. Mount bearing on adapter with the large bore side of the Generally the preservative with which new bearings are coated inner ring to match the taper on the outside diameter of the before leaving the factory need only be removed from the adapter.
With bearing hand tight on the adapter, locate outside cylindrical surface and bore of the bearing. Do not apply lockwasher. Drive up procedure An exception is if the bearing is to be grease lubricated and could damage it.
To avoid damage to the bearing it is used at very high or very low temperatures. In such cases the most important during this and subsequent operations, that bearings should be washed and dried to prevent any the shaft be blocked up so the bearing is unloaded.
Bearings which have become contaminated because of Lubricate the chamfered face of the locknut and the threads improper handling damaged package etc. Wrenches are available for bearing drive up. For Bearings which, when taken from their original package, have. Hot dipping is still used, principally on large-size bearings. Never tighten the locknut with a hammer and drift. The locknut will be damaged and chips can enter the bearing. Continue tightening locknut and measure the internal Check that the shaft diameter is to recommended tolerance.
Remove locknut and install the procedure and the installation instructions to be used for this washer with the inner prong located in the slot provided in the assembly. If necessary tighten the locknut to a point where interchangeable. Do not mix. Adapter Sleeve Mounting Spherical Roller. For a large size adapter sleeves size 44 and up the use Bearings of the oil injection mounting method is standard practice.
For these adapter sizes the lockwasher is replaced with a All spherical roller bearings with taper bore, to be mounted lockplate. In these cases with the locknut tightened to on adapter sleeves, have to be driven up the taper achieve the proper reduction of internal clearance in the sufficiently to achieve the proper reduction of clearance. Note how much the locknut will have to be The unmounted clearance of each bearing must be tightened for the holes in the locknut to align with the holes measured and recorded.
Stand the bearing on the bench and in the lockplate. Reverse the lockplate and observe how insert progressively thicker feelers the full length of the roller much the locknut will have to be tightened for the hole in the between the unloaded roller and the outer ring at the top locknut to align with the holes in the lockplate. The lockplate location. Never roll the rollers over the feelers as the wrong is to be placed in the position requiring the least tightening to value will be obtained.
When the locknut has been tightened to achieve this, then insert and tighten cap screws. Lock cap screws with lockwire through holes in heads.
Split pillow block housings – SNL and SE 2, 3, 5 and 6 series
En Cooper estamos orgullosos de ser reconocidos mundialmente como fabricante de rodamientos de primera calidad. Al estar partidos los rodamientos Cooper, este problema se elimina. Estas aplicaciones incluyen:. Cooper ofrece una gran gama de soluciones de sellado o estanqueidad para las condiciones ambientales mas adversas. Entre la gama de retenes disponibles hay retenes para pasamamparos, retenes dobles, aros de bronce y retenes para velocidades altas y bajas. Combining more than a century of world leading bearing technology, from SKF self-aligning knowledge and Cooper split roller bearing expertise, SKF Cooper are excited to announce the launch of the new split spherical roller bearing range, available in open unsealed and sealed versions. News SKF Cooper launch new split spherical roller bearings Combining more than a century of world leading bearing technology, from SKF self-aligning knowledge and Cooper split roller bearing expertise, SKF Cooper are excited to announce the launch of the new split spherical roller bearing range, available in open unsealed and sealed versions.