Split Pillow Blocks
Split pillow blocks consist of bearing cover, bearing base and bearing body etc., where the bearing cover and base are bolted separately. the shaft can be disassembled without disassembling the entire housing, which facilitates repair and maintenance and saves man-hours.
Detail Introduction :
Split pillow blocks consist of bearing cover, bearing base and bearing body etc., where the bearing cover and base are bolted separately. the shaft can be disassembled without disassembling the entire housing, which facilitates repair and maintenance and saves man-hours. A versatile mounting assembly designed for specific applications, split shaft tables can accommodate a wide range of shaft sizes and higher loads. They are typically manufactured with heavy-duty cast iron housings for greater flexibility and more sealing and lubrication options.
Split pillow block bearings can be separated from the base and carry primarily radial loads. Spherical roller bearings and self-aligning ball bearings are available for cylindrical and tapered bores. split pillow blocks also help meet unusual clearance or tolerance requirements, and machine ends have flat surfaces for jacking screws. this type of bearing is commonly used in steel mills, pulp and paper mills, conveyors and many other applications.
Split pillow block bearings offer a number of significant advantages.
The main difference between the various series of split pillow block bearings is that they can withstand different loads and different forms of seals (felt, double lip seal, U-shaped seal, labyrinth ring seal, etc.), good thermal conductivity, easy installation and disassembly, greatly improving the effectiveness of the seal.
In addition, the split bearing housing is widely used and convenient, suitable for a variety of locations with limited space, maintenance inconvenience of various places and easy to install, can adjust the gap caused by wear, but its structure is more complex than the overall bearing housing.
Based on the above characteristics, split pillow block bearings in various industries have a wide range of applications:.
In skf all bearings, split pillow block is the most versatile mounting parts, product design by half, cover bottom can be split, equipment installation and commissioning is convenient. For demanding equipment, split pillow block bearings are also designed with double stud holes and four stud holes, these parts mainly bear the radial load directly on the inner base. They are used on demanding machines.
Skf develops and produces split pillow blocks to accommodate a wide range of shaft sizes and to withstand high loads. The heavy-duty housings come standard in gray cast iron and offer greater flexibility in terms of sealing and lubrication (using grease or oil). Split pillow block bearings can be used in equipment such as belt processing equipment in steel mills, fans and blowers, felt rollers and drying cylinders in the paper industry, crushers, hammer mills and drying ovens in the ore processing industry.
Like most products, split pillow blocks require proper care and maintenance when in use if their service life is to be effectively extended.
Maintenance and care of split pillow blocks.
Like bearings, split pillow blocks need to be maintained and serviced on a regular basis in order to detect problems early and to improve productivity and economy. Bearing seat in the removal of its internal cleaning, to remove impurities; then observe its aperture surface whether there is wear, bump phenomenon; after checking its aperture surface shape and size accuracy, to see whether it meets the current requirements, if necessary for repair or scrap processing.
Skf bearings are well known in the world and widely recognized by the industry. The split pillow blocks developed and produced have very high quality standards and are widely used in various industries, which not only play a good role in supporting and reducing friction, but also further improve the quality standards of the equipment.
Here are some answers to common questions about split pillow blocks.
•Spherical roller bearings (SAF and SAW)
•Self-aligning ball bearings (SAF)
•CARB toroidal roller bearings (SAF)
Bearing dimension series
•12, 13, 22, 23, 30 (SAF)
•22, 32 (SAW)
Shaft diameter range
•1 3/16 to 10 1 /2 in. (SAF)
•3 3/16 to 7 15/16 in. (SAW)
Typical shaft-bearing combinations
•Plain shaft with bearing on an adapter sleeve
•Stepped shaft with bearing on a cylin- drical seat
•Grey cast iron
•Spheroidal graphite cast iron
SAF and SAW split pillow (plummer) block housings are popular SKF bearing housings with inch dimensions, developed to be the first choice for design, quality and economy.
SAF and SAW housings enable the incorpo- rated bearings to achieve maximum service life with less need for maintenance. Different housing variants and seal designs are available,making the use of tailored housings virtually unnecessary and enabling cost-effective
Standard housing design
SAF and SAW housings are split pillow (plum- mer) block housings consisting of a cap and base. SAF housings have two or four holes cast into the base for attachment bolts. SAW hous- ings have four cast holes.
SAF housings are available in two designs depending on the series. The designs share the same dimensions. SAF housings in the 2(00) and 5(00) series follow the M5 design (fig. 1), while housings in the 3(00) and 6(00) series follow the A design (fig. 2).
SAF and SAW (fig. 3) housings share the same external dimensions, except for the width of a few SAW sizes. These housings are wider to accommodate wider 32 series bearings or to accomodate the larger axial displacement
of bearings in the 22 series.
Features and benefits
SAF and SAW housings share some of the following features and benefits:
Simple mounting and dismounting
To simplify mounting and make alignment more accurate, the feet of SAF and SAW housings have a flat, square design.
To make it easier to separate the cap and base, pry slots are cast into the housing. Smaller sizes have sphered dowel pins to further ease cap removal.
Mounting instructions are supplied with each housing.
Caps and bases individually marked
The housing base and cap are matched during manufacture and are not interchangeable with the caps and bases of other housings. To help avoid mismatch, each cap and base are num-
bered (fig. 4).
Grease or oil lubrication
These housings are designed to accommodate both grease and oil lubrication. The sump in the housing base acts as a reservoir to provide an adequate quantity of grease or oil.
SAF and SAW housings are made of grey cast iron.
Paint, corrosion protection
SAF and SAW pillow block housings are painted blue (RAL 5001) using a water based alkyd/ acryl paint. The paint protects the housing in accordance with ISO 12944-2, corrosivity cat- egory C2 (i.e. exterior atmospheres with low level of pollution, interior atmospheres where condensation may occur). The paint is not affected by most lubricating or engine oils, cutting fluids or alkalescent washing chem-icals. Housings can be repainted with most water or solvent based 1- or 2-component paints.
Special paints or preservatives can be sup- plied on request. Unpainted surfaces are pro- tected by a solventless rust inhibitor.
In addition to standard design SAF and SAW pillow (plummer) block housings, a number of variants are also available. Additional features include:
• milled foot pads to provide a uniform flat surface for fasteners
• special machining for lubrication and condition monitoring systems
• different bearing seat tolerance classes
• special seals
• machined base ends, to enable precision positioning
For additional information contact the SKF application engineering service.
For applications where extra strength is needed, SAF housings are also available in cast steel, designation SAFS. Check availability prior to ordering. Cast steel housings come in three different designs. The different designs share the same dimensions as SAF housings made of grey cast iron.
SAF housings are also available in ductile iron (spheroidal graphite cast iron), designation SAFD, from size 509 to 544 and from size 215 to 244. For additional information, contact the SKF application engineering service.
SAF and SAW pillow (plummer) block housings are available with different standard sealing solutions (fig. 5):
•labyrinth seals (standard or PosiTrac)
•labyrinth seals with internal contact element (PosiTrac Plus)
•taconite heavy-duty seals
•end plugs (end covers)
SAF and SAW housing caps have two drilled and tapped lubrication holes, one centred and one offset, (fig. 8) that are sealed with standard pipe plugs.
The housings also have dimples on the cap where holes can be drilled and tapped if other positions are required. Two dimples on the outer sides of the central ridge indicate the position of lubrication holes to lubricate laby- rinth seals. All SAF and SAW housing bases are equipped with a drain plug on each side (fig. 9) to purge or drain old lubricants or to serve as an outlet for circulating oil. The sump in the housing base is large enough to accom- modate a sufficient quantity of lubricant to provide reliable long-term operation.
Relubrication via the outer ring
The hole in the centre of the cap should be used to relubricate spherical roller bearings with a relubrication feature (a lubrication groove and holes in the outer ring) ( fig. 10). When applying grease via the relubrication feature, the shaft should be rotating.
Narrow bearings (dimension series 13 and 22) in the locating position can be displaced axially, so that the relubrication groove in the bearing does not line up with the relubrication hole in the housing cap. Make sure the bearing is sufficiently centred when relubricating.
Relubrication from the side
When relubricating from the side, which is typically necessary for self-aligning ball bear- ings and CARB toroidal roller bearings, the offset hole in the housing should be used.
SAF housings from size 507 to 528 have an integral flange that guides grease from the grease fitting directly to the rolling elements (fig. 11).
When bearings mounted on an adapter sleeve have to be relubricated from the side, the grease should be introduced from the side opposite the lock nut.
When bearings mounted at the end of a shaft have to be relubricated from the side, the grease should be applied at the point closest to the end plug.
Circulating oil lubrication systems
W hen using a circulating oil lubrication system with SAF and SAW pillow blocks, oil is intro-duced through one of the inlet holes in the housing cap and drained from one or both holes in the base. For spherical roller bearings, oil should be introduced through the centre hole in the cap and drained from both sides of the base (fig. 12). For self-aligning ball bearings and CARB toroidal roller bearings, oil should be introduced through the offset hole in the cap and drained from the opposite side of the base so that oil is forced through the bearing (fig. 13).
Drains should lead downward immediately outside of the housing to prevent the accumu- lation of oil in the housing. Too high an oil level can result in higher operating temperatures due to churning of the lubricant. The drain piping must be adequately sized and arranged to provide adequate drainage. Additional con- siderations may be necessary when using cir- culating oil. These can include special seals, cross drillings in the housing, wet sump requirements, flow rates, and enlarged drain holes. For additional information, contact the SKF application engineering service.
SAF and SAW pillow (plummer) block housings must be mounted properly using the appropri- ate tools and state of the art mechanical mounting methods. All the associated com- ponents must also meet certain basic require- ments († Specifications for shafts and housing support surfaces on page 45). Mounting instructions are provided with each housing. For information about mounting rolling bear- ings, refer to the SKF bearing maintenance handbook or skf.com/mount.
Pinning or supporting the housing
Some load conditions may require the housing to be pinned to its support surface or a stop to accommodate loads acting parallel to the housing support surface.
SAF and SAW pillow (plummer) block housings have appropriate positions for condition moni- toring sensors. These housings provide a flat area to attach sensors for different condition monitoring equipment. (fig. 14)
Position 1 is a measurement point perpen- dicular to the shaft, and should be used when the housing is hung from its support or when loads act away from the support surface.
Position 2 is a measurement point parallel to the shaft and should be used when loads act toward the support surface.
Both positions 1 and 2 are in accordance with ISO 10816-1.
Position 3 is a measurement point that is approximately 20° to 45° to the shaft axis.
SAF and SAW housings have dimples cast into the housing cap to show where condition monitoring sensors can be mounted for max- imum effectiveness.
1.Why should we use split pillow blocks?
Bearing housing is the outer support point of the bearing, is used to support the bearing, fixed bearing outer ring, only let the inner ring rotate, the outer ring remain unmoved, always with the direction of transmission consistent (such as the direction of motor operation), and to maintain balance. The concept of bearing housing is a collection of bearings and boxes to facilitate the application, the advantage is that there can be a better fit, more convenient to use, reducing the cost of using manufacturers. As for the shape, there are various, usually a box, the bearing can be installed in it.
A bearing can have a number of different housings to match it, the same a housing can also choose different bearings to match. Split bearing housing the upper cover and the base can be separated, mainly to bear radial load, suitable for cylindrical hole and tapered hole spherical roller bearings and spherical ball bearings.
Split bearing housing that is split bearing housing (commonly known as tile box), the main feature is easy to install, can adjust the gap caused by wear and tear, but the structure is more complex than the overall bearing housing.
2. What is the difference between three-dimensional bearing housing and split bearing housing?
Integral (i.e., non-separate) vertical bearing housing with screw fastening bearing box cover. The vertical bearing housing group block was originally developed as an axlebox for light rail trucks, but can also be used for conventional vertical bearing housing groups. Non-separated vertical bearing housing groups are more rigid than separated housings, and some can withstand heavier loads. The main characteristics are simple structure, low cost; due to wear and tear caused by the clearance can not be adjusted; can only be installed or removed along the axial direction.
Split pillow blocks (commonly known as tile box), the main feature is easy to install, can adjust the clearance caused by wear and tear, but the structure is more complex than the integral bearing housing.
3. What are the main types of bearing housings?
According to the shape of the bearing seat classification.
1, outer spherical bearing with seat, also known as bearing unit (SKF's statement). 126.96.36.199 external spherical bearing seat according to the bearing series is divided into 200 series. 500 series. 300 series. 600 series. XOO series. 2, external spherical bearing seat according to the shape is divided into vertical seat (P seat), square seat (F seat), diamond-shaped seat (FL seat), round seat (C seat), tab round seat (FC seat), tab square Seat (FS seat), dark hole seat (PA seat), hanging seat (FA seat).
2, integral (i.e. non-separated) vertical bearing housing group seat, with screw fastening bearing box cover. These vertical bearing housing groups were originally developed as axle boxes for light rail trucks, but can also be used for conventional vertical bearing housing groups. Non-separated vertical bearing housing groups are more rigid than separated housings, and some can withstand heavier loads. External spherical bearing block also belongs to the integral type seat.
split pillow blocks.
Split pillow blocks, according to the different optional bearings and shaft requirements are divided into SN2, 5, 3, 6 series, SNL2, SNL5, SD has 2, 5, 3, 6, 3100, 3000, 3200 bearing blocks are divided into: split pillow blocks, sliding bearing blocks, rolling bearing blocks, bearing blocks with flange, external spherical bearing blocks, etc..
4.Split pillow blocks what are the technical points?
1.Bore: Bore is split pillow block support and positioning role of the most important surface, it is compatible with the outer ring of the bearing. In addition to the cylindricity and coaxiality, should also consider the hole axis straightness requirements. To ensure the function of the parts and improve its wear resistance, the bore surface roughness is generally Ra3.2~Ra1.6.
2. hole axis line to the ground distance: to ensure that the base and the upper cover of the parallelism and size requirements.
5.What is the difference between split pillow blocks and bearing boxes?
Split pillow block and bearing box are not the same thing, they are two different products.
The split pillow block has only one bearing, while the bearing box has more than one bearing, it is a box part that supports and lubricates the bearing. Bearing housing is a comprehensive load can be accepted, the structure of the special large and very large bearing housing, which has a compact structure, sensitive rotation, device maintenance is convenient. Where there is a bearing to have a support point, bearing support point is the shaft, the outer support is often said to be the bearing seat. As a bearing can choose a different bearing seat, and a bearing seat at the same time can choose different types of bearings, so the bearing seat of many varieties.
Bearing box is a kind of support and lubrication bearing role of the box parts. At the same time, bear the axial and radial forces generated by the equipment in the work. In equipment with rotating shaft, the shaft is generally supported by the bearing to rotate, the bearing is installed in the bearing box, the bearing box is filled with lubricating oil, in the process of work, using the bearing to get lubricated. At the same time, the various forces that the shaft is subjected to when working are also transferred to the bearing box, which is carried by the bearing box, and the material of the bearing box is generally cast iron and cast steel.
6.What are the precautions when using split pillow blocks?
1.split pillow blocks cooling system use: split pillow blocks cooling water in the correct use of the case not only to extend the service life of the bearing housing, but also to improve production efficiency. Split pillow blocks in the use of state, if the mold temperature is too high, it is easy to make the mold core surface early cracking, the production of products will also have an impact. The use of cooling water can also reduce the loss of the top bar and core due to overheating of the bearing seat temperature.
2. Split pillow in the beginning of the production process must be preheated bearing seat, to prevent the cold bearing seat suddenly encounter hot metal liquid and lead to cracked lines, more complex bearing seat can be used torch, liquefied gas, good conditions with mold temperature machine, more simple bearing seat can use slow pressure shot preheat.
3. If split pillow block is equipped with neutron control, then pay attention to absolutely prohibit the signal line between the die-casting machine and the bearing block has the phenomenon of joints, because in daily production, it is difficult to avoid the signal line on the water, or the joint wrapping place easy to break, thus causing a short connection with the machine tool, if the signal error, the light alarm automatically stop delay, heavy signal disorder, the split Bearing seat top bad, causing unnecessary losses.
4., the split pillow blocks split surface cleanup, which is very laborious, but also easy to be ignored, if not cleared in a timely manner, split bearing block split surface is easy to collapse, the possibility of complete repair is very small, but also affect product quality.
7.How do I choose a pillow block?
Split pillow blocks is a kind of comprehensive load can be accepted, the structure of special large and very large bearing housing, which has a compact structure, sensitive rotation, device maintenance and other characteristics.
Where there is a bearing to have a support point, the inner support point of the bearing is the shaft, the outer support is often said to be the housing. After using the split housing can give the bearing operation to provide a fulcrum, so as to further play out the powerful advantages of the bearing. When choosing a bearing housing, before making a decision, you all need to consider the following factors.
1. Shaft diameter
2. Shaft height
3. Shaft size
4. Maximum load capacity
5. Maximum speed
8.How to install split pillow blocks?
Both individual motor bearings and multiple bearings of a unit should be mounted on the main longitudinal axis of the machine being connected or on the longitudinal axis of the unit. The center of the bearing is measured by hanging wire and wire hammer. (A wooden strip is stuck inside the bearing arc, and a thin iron bar is nailed in the center of the strip to mark the center position).
Adjust the position of the shaft in the seat, from the most edge of the bearing seat, with a level on the bearing seat surface to check the level of these planes. Use the latitude and longitude meter or level meter to check whether the plane of several shaft seats in the same level, and use the line hammer and other methods to find the center of each bearing is in the same axis.
According to the above method to adjust the work of split pillow blocks, eliminate deviation in the process, should be used in the jack type tool to move the bearing seat, do not adopt the method of impact, hammering.
With this method to adjust the split pillow block accuracy error is about 0.5 ~ 1.0 mm within. It should be pointed out: the installation of the bearing block adjustment is only pre-conditioning, in the centering also adjust to achieve the requirements of the axis centerline consistent. After the bearing block is pre-adjusted, just tighten the screws evenly (by diagonal cycle tightening), while the insulation sleeve and stable nail can be temporarily not put, and then put before the final completion of the centering work or test run.
|SAF 23056 KA x 10||495.3 mm||869.95 mm||73.025 mm||228.6 mm||315.119 mm||147.803 mm||419.999 mm||250.825 mm||101.6 mm||1/4 NPT|
|FSAF 1517 x 2.13/16 T||182.166 mm||330.2 mm||36.513 mm||88.9 mm||198.438 mm||45.796 mm||150 mm||95.25 mm||31.75 mm||1/8 NPT|
|FSAF 1517 T||182.166 mm||330.2 mm||36.513 mm||88.9 mm||198.438 mm||45.796 mm||150 mm||95.25 mm||31.75 mm||1/8 NPT|
|FSAF 1515 x 2.3/8 T||157.559 mm||285.75 mm||31.75 mm||79.375 mm||193.675 mm||37.008 mm||130 mm||82.55 mm||28.575 mm||1/8 NPT|
|SAF 1516 x 2.5/8 TLC||169.863 mm||330.2 mm||49.212 mm||88.9 mm||126.603 mm||42.799 mm||140 mm||88.9 mm||31.75 mm||1/8 NPT|
|SAF 1516 TLC||169.863 mm||330.2 mm||49.212 mm||88.9 mm||126.603 mm||42.799 mm||140 mm||88.9 mm||31.75 mm||1/8 NPT|
|FSAF 22515 x 2.3/8||157.559 mm||285.75 mm||28.575 mm||79.375 mm||118.666 mm||37.008 mm||130 mm||82.55 mm||28.575 mm||1/8 NPT|
|FSAF 22515 TLC||157.559 mm||285.75 mm||28.575 mm||79.375 mm||118.666 mm||37.008 mm||130 mm||82.55 mm||28.575 mm||1/8 NPT|
|SSAFS 22540 x 7.1/4 TLC||419.1 mm||749.3 mm||62.706 mm||203.2 mm||295.275 mm||107.798 mm||359.999 mm||209.55 mm||85.725 mm||1/4 NPT|
|SSAFS 22540 x 7.1/4 T||419.1 mm||749.3 mm||62.706 mm||203.2 mm||358.775 mm||107.798 mm||359.999 mm||209.55 mm||85.725 mm||1/4 NPT|
|SSAFS 22540||419.1 mm||749.3 mm||62.706 mm||203.2 mm||295.275 mm||107.798 mm||359.999 mm||209.55 mm||85.725 mm||1/4 NPT|
|FSAF 1515 x 2.1/2 TLC||157.559 mm||285.75 mm||31.75 mm||79.375 mm||118.666 mm||37.008 mm||130 mm||82.55 mm||28.575 mm||1/8 NPT|
|SSAFS 22517 x 2.7/8 T||187.325 mm||330.2 mm||34.925 mm||88.9 mm||195.275 mm||45.796 mm||150 mm||95.25 mm||38.1 mm||1/8 NPT|
|SSAFS 22517 x 2.7/8||187.325 mm||330.2 mm||34.925 mm||88.9 mm||127 mm||45.796 mm||150 mm||95.25 mm||38.1 mm||1/8 NPT|
|SSAFS 22517 x 2.13/16 TLC||187.325 mm||330.2 mm||34.925 mm||88.9 mm||127 mm||45.796 mm||150 mm||95.25 mm||38.1 mm||1/8 NPT|
|FSAF 22517 x 2.7/8||182.166 mm||330.2 mm||34.925 mm||88.9 mm||127 mm||45.796 mm||150 mm||95.25 mm||31.75 mm||1/8 NPT|
|FSAF 22516 x 2.5/8||169.863 mm||330.2 mm||31.75 mm||88.9 mm||126.603 mm||42.799 mm||140 mm||88.9 mm||31.75 mm||1/8 NPT|
|FSAF 22517 x 2.13/16 T||182.166 mm||330.2 mm||34.925 mm||88.9 mm||198.438 mm||45.796 mm||150 mm||95.25 mm||31.75 mm||1/8 NPT|
|FSAF 22516 TLC||169.863 mm||330.2 mm||31.75 mm||88.9 mm||126.603 mm||42.799 mm||140 mm||88.9 mm||31.75 mm||1/8 NPT|
|FSAF 1518 x 3.1/4||192.484 mm||349.25 mm||38.1 mm||98.425 mm||149.225 mm||49.809 mm||160 mm||101.6 mm||41.275 mm||1/8 NPT|
SKF Bearing Cross References
|SAFS 23028 KATLC x 4.7/8||257.175 mm||419.1 mm||46.038 mm||120.65 mm||190.5 mm||72.619 mm||210 mm||133.35 mm|
|SAW 23520 x 3.3/8 T||222.25 mm||387.35 mm||42.069 mm||111.125 mm||222.25 mm||70.104 mm||180 mm||114.3 mm|
|SSAFS 22518 x 3.1/16 T||196.85 mm||349.25 mm||38.1 mm||98.425 mm||206.375 mm||49.809 mm||160 mm||101.6 mm|
|FSAF 22516 x 2.3/4 TLC||169.863 mm||330.2 mm||31.75 mm||88.9 mm||126.603 mm||42.799 mm||140 mm||88.9 mm|
|SAF 23028 KAT x 5||258.762 mm||419.1 mm||46.038 mm||120.65 mm||255.588 mm||72.619 mm||210 mm||133.35 mm|
|SSAFS 22522 x 3.11/16||244.475 mm||419.1 mm||45.244 mm||120.65 mm||165.1 mm||62.89 mm||200 mm||125.425 mm|
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