Split Plummer Block Housings
Split plummer block housings are the most popular SKF housings on the market and have developed into the preferred choice for design, quality and economy.
They enable built-in bearings to achieve maximum service life with less maintenance requirements. Different housing variants and seal designs are available, virtually eliminating the need for custom housings and allowing cost-effective bearing configurations to be manufactured.
Detail Introduction :
Bearing seat is a kind of turbine cylinder body or foundation mounted on the bearing support components. Bearing seat with the use of bearings and exist. Split plummer block housings are one of them.
Split plummer block housings are the most popular SKF housings on the market and have developed into the preferred choice for design, quality and economy. They enable built-in bearings to achieve maximum service life with less maintenance requirements. Different housing variants and seal designs are available, virtually eliminating the need for custom housings and allowing cost-effective bearing configurations to be manufactured.
Bearing housings are generally located at the ends of the rotating shaft and serve primarily to support, hold and position the rotating shaft and its connections in relation to each other. The important construction methods of plummer block housings are four point contact ball plummer block, double row angular contact thrust ball plummer block, interpolated cylindrical roller plummer block, interpolated tapered roller plummer block, and three row cylindrical roller fit plummer block.
Split plummer block housings advantageous features.
1.Even if the surrounding space is small, it can be installed and used.
2.based on the original product development design, as small as possible product size.
3.The product comes with bearings, assembled into components for shipment, no need to install yourself.
4.Economic type bearing with seat is processed by aluminum drawing material, suitable for mass production and cost reduction.
5.The shell of the product uses drawn profiles to ensure the necessary precision while significantly improving the cost performance.
6、The additional flesh steal design at the bottom makes the installation more stable, and the rounded shape does not need to be chamfered, which improves safety and appearance.
Applications of Split plummer block housings.
Bearing housing is used to support the bearing, fix the outer ring of the bearing, only let the inner ring rotate, the outer ring remain unmoved, always keep the same direction with the transmission, and keep the balance. The concept of bearing housing is a collection of bearings and boxes to facilitate the application, which has the advantage of better fit, easier to use, and reduces the cost of using manufacturers.
According to the different requirements of the bearing and housing, the classification of the bearing housing is not exactly the same, in use, according to the design, carefully check the selection. For standard bearing housing different applications, can choose different materials bearing housing such as: gray cast iron iron, ductile iron and cast steel, stainless steel, plastic special bearing housing.
Split plummer block housing can be adapted to a wide range of shaft sizes and can withstand high loads. Heavy-duty housings are available in gray cast iron as standard, offering greater flexibility in sealing and lubrication options. Applications include: belt processing equipment, fans and blowers in steel mills, lint rolls and drying cylinders in the paper industry, crushers, hammer mills and drying ovens in the ore processing industry.
Split plummer block housings are a special type of bearing housing that can accept combined loads and are characterized by compact construction, sensitive rotation and easy maintenance of the unit. The base of the bearing block is reinforced by ribs and additional materials around the hole of the connecting bolt to improve the condition of the support on the base plate. The connecting bolt can be preloaded for better fixation and cannot deform the base of the bearing block or the hole of the bearing block.
The following is a detailed description of the bearings.
•Self-aligning ball bearings
•Spherical roller bearings
•CARB toroidal roller bearings
Bearing dimension series
•02, 03, 22, 23, 32
Shaft diameter range
•20 to 30 mm and 60 to 160 mm
•3 /4 to 1 1 /8 in. and 2 1 /2 to 5 1 /2 in.
Typical shaft-bearing combinations
•Plain shaft with bearing on an adapter sleeve
•Stepped shaft with bearing on a cylindrical seat
•Grey cast iron
•Spheroidal graphite cast iron
Compliance to standards
(two-bolt plummer block housings)
•SN, SNA, SNH series
SNL plummer block housings are the most popular SKF bearing housings on the market, developed to be the first choice for design, quality and economy.
SNL plummer block housings enable the incorporated bearings to achieve maximum service life with less need for maintenance. Different housing variants and seal designs are available, making the use of tailored hous- ings virtually unnecessary and enabling cost- effective bearing arrangements to be made.
For sizes 507 up to and including 515-612, SNL housings are replaced by a new genera- tion of plummer block housings († Split plum- mer block housings SE 2, 3, 5 and 6 series, starting on page 139). From size 516-613 upward, SNL plummer block housings in the 2, 3, 5 and 6 series remains.
Features and benefits
SNL plummer block housings in the 2, 3, 5 and 6 series have the following features and benefits:
The housing base is reinforced with ribs and has extra material surrounding the holes for the attachment bolts (fig. 2). The attach- ment bolts can be preloaded to locate the housing without deforming the housings base or bore.
Good heat dissipation
Additional ribs in the housing base (fig. 3) increase the contact area between the housing base and the support surface to improve the heat flow from the bearing outer ring to the support surface.
Grease guiding system
For more efficient relubrication from the side, SNL housings from sizes 216 and 516-613 upwards have an integrated flange that guides grease from the grease fitting directly to the bearing (fig. 4).
Caps and bases individually marked
The housing cap and base are matched during manufacture and are not interchangeable with the caps and bases of other housings. To pre- vent any mismatches, a unique serial number is marked on both the housing cap and the base (fig. 5).
Dimples to locate accessories
Dimples cast into the housing cap indicate where grease fittings and condition monitor- ing sensors can be mounted for maximum effectiveness (fig. 6).
To simplify mounting and make alignment more accurate, lines indicating the centre of the bearing seat and the housing bore axis are cast into the housing base. Dimples indicate the position for dowel pins (fig. 7). Mount- ing instructions are supplied with each seal pack.
Housings from size 524-620 and above are supplied with an eye bolt on the cap for safe and easy handling.
In addition to standard design SNL plummer (pillow) block housings, a number of variants are also available. Variants include housings made of different materials, alternative attachment bolt hole configurations, different bearing seat tolerance classes and modifica- tions for special applications.
SNL housings are made of grey cast iron.
Paint, corrosion protection
SNL housings are painted black (RAL 9005) using a water based alkyd/acryl paint. The paint protects the housing in accordance with ISO 12944-2, corrosivity category C2 (i.e. exterior atmospheres with low level of pollu- tion, interior atmospheres where condensa- tion may occur). The paint is not affected by most lubricating and engine oils, cutting fluids or alkalescent washing chemicals. Housings can be repainted with most water or solvent based 1- or 2-component paints.Unpainted surfaces are protected by a solv- entless rust inhibitor.
Boundary dimensions are in accordance with ISO 113 for two-bolt plummer block housings.
SNL plummer block housings in the 2, 3, 5 and 6 series are dimensionally interchangeable with the earlier SN, SNA and SNH series.
Four-lip seals replace the former double-lip seals (TSN .. G). When compared to double-lip seals, the new seals are more effective. They also generate less friction, which enables higher shaft speeds. Four-lip seals are hori- zontally split and easy to mount.
The permissible angular misalignment for seals mounted on shafts ≤ 100 mm in diam- eter is approximately 1° and approximately 0,5° for larger shafts.
V-ring seals consist of a V-ring and a sheet steel sealing washer with a vulcanized rubber lip. The rubber lip fits into the seal groove in the housing. The washer is protected against corrosion.
V-rings can accommodate circumferential speeds up to 7 m/s. For circumferential speeds between 7 and 12 m/s, they should be located axially on the shaft. At speeds above 12 m/s,
a support ring must be used to prevent the seal from lifting. Recommended dimensions for appropriate support rings for axial and radial location are provided in table 4. Hous- ing sizes 205 to 211 and 306 to 314 cannot be used with a support ring and are therefore not suitable for V-ring seals at operating speeds above 7 m/s.
The permissible angular misalignment for
V-ring seals is approximately 1,5° for a 50 mm shaft decreasing to approximately 1° for shaft diameters ≥ 150 mm.
The axial movement of the shaft relative to the housing is limited to ±1 mm for shaft diameters up to 65 mm, to approximately
±1,2 mm for shaft diameters up to 100 mm and to approximately ±1,5 mm for larger shaft diameters.
For arrangements with a vertical shaft, the V-ring of the lower seal should be mounted inside the housing.
Felt seals or strips
Felt seals or strips are simple and effective. At circumferential speeds above 4 m/s, a small gap forms between the felt and shaft, trans- forming the contact seal into a non-contact, gap-type seal.
In applications where bearings are mounted on a plain shaft with an adapter sleeve, split felt ring seals are typically used.
If the bearings are to be installed on a stepped shaft with a cylindrical seat (housing sizes 205 to 218 inclusive), loose felt strips can be used. The strips are 170 mm in length. They should be cut to the correct length and soaked in hot oil for a few minutes prior to mounting. The required number of strips per housing (for both sides) is listed in the product tables .
For applications where there are high speeds or extreme temperatures, SKF recommends using labyrinth seals. Labyrinth rings, mounted on the shaft, form a multi-stage labyrinth seal with the housing seal grooves. Hollow, silicone
rubber cords (2 ¥ 4 mm), supplied with the rings, hold the rings in place on the shaft.
Taconite heavy-duty seals with a radial labyrinth
For bearing arrangements that must operate under highly contaminated conditions, such as those encountered in mining, taconite heavy- duty seals, which can be filled with grease, are recommended. Grease enhances the sealing effect and extends the service life of the seals.
Taconite heavy-duty seals are labyrinth seals combined with a V-ring seal. The inner ring of the labyrinth seal is solid but the outer ring is split. They can be relubricated via a grease fitting in the main body of the seal.
The axial movement of the shaft relative to the housing is limited to ±1 mm for shaft diameters up to 65 mm, approximately ±1,2 mm for shaft diameters up to 100 mm and ±1,5 mm for larger shaft diameters.
I n addition to the standard seal assortment, SNL housings are available, on request, with high-temperature seals, taconite heavy-duty seals with an axial labyrinth, or custom seals
for special applications.
For high operating temperatures, up to 250 °C (480 °F), high-temperature felt seals or strips should be used. The felt seals can accommo- date circumferential speeds up to 2 m/s. They are identified by the designation suffix CB, e.g. TSN 516 CB. For additional information about the felt strips, contact the SKF application engineering service.
Split plummer block housings complete guide.
Where there is a bearing there must be a support point, the inner support point of the bearing is the shaft, the outer support is often said to be the bearing seat. split plummer block housing is very common application, this guide describes in detail about it, hope it will be helpful to you.
1、What are the types of bearing seats?
According to the different requirements of bearings and housings, the classification of bearing seats are not exactly the same, general bearing seats can be divided into: split bearing seats, sliding bearing seats, rolling bearing seats, bearing seats with flange, external spherical bearing seats, etc.
Non-separated vertical bearing housing blocks with screw-fastened bearing box covers, these vertical bearing block blocks were originally developed as axle boxes for light rail trucks, but can also be used for conventional vertical bearing block blocks. Non-separate vertical bearing housing group seat than the separation of the bearing seat rigidity, some can withstand heavier loads, external spherical bearing seat also belongs to the integral seat.
2、Why use split plummer block housings?
The main feature is easy to install, can adjust the gap caused by wear and tear, but the structure is more complicated than the integral bearing block. Split bearing housing cover and base can be separated, mainly to bear radial load, suitable for cylindrical hole and tapered hole spherical roller bearings and spherical ball bearings.
3、What are the advantages of split plummer block housings and flanged housings?
Split block housings are the most versatile mounting assembly, the product design is horizontally split, cover and bottom can be detached, so in the equipment installation and commissioning and maintenance is also very convenient. For demanding equipment, split housings are also available in two designs with double stud holes and four stud holes. These components mainly bear the radial load directly inside the base, for the requirements and high equipment.
Split bearing seat can choose LEP / LOR three ring oil seal, contact oil seal, corner rock oil seal and end cover. So that the shaft and housing surface work with a small gap so as to prevent the entry of contaminants and retain the grease or oil, thus ensuring a longer service life of the bearing and housing.
Flange bearing seat is the most typical and common type, suitable for all transmission and shaft and mounting surface parallel to the machinery. It is used with full strength and steel. Flange bearing seat has a variety of types from the shape of: square, round, diamond, tab square, tab round, ring type, slider type, etc..
The above types of flange bearing seat mounting holes have, four holes, three holes, two holes and without mounting holes, without mounting holes belong to the slider type up and down with two slots. In the rack can move back and forth, so the most suitable for the need to adjust the distance between the axis of the occasion, machinery in operation axis can also move, more for belts, chains and other drive shaft.
4、How to install split plummer block housings?
Cylindrical hole installation: It includes using interference fit to install a straight hole bearing to a cylindrical shaft. This method of assembly is particularly suitable for high-speed equipment. In cylindrical bore mounting, the shaft must have tight tolerances at the housing and machined threads on the jam nut, and the inner ring usually needs to be heated during installation.
Tapered bore mounting: In adapter mounting, the tapered bore bearing is mounted to the cylindrical shaft through a tapered adapter. Adapter mounting is considered to be the universal mounting method and most split housings are cross-bearing onto the shaft using this method. The housing does not require machining to the same exacting tolerances as required for cylindrical bore mounting, and this mounting method does not require heating of the bearing. In addition, disassembly is quite easy due to the use of tapered adapters. The overall cost of adapter mounting is also less than cylindrical bore mounting.
5、How to maintain and maintain the split plummer block housings?
(1) The use of bearing housing cooling system. Bearing housing cooling water in the correct use of the case not only to extend the life of the housing, but also to improve productivity. The benefits are to effectively extend the life of the bearing block, save the die casting cycle, improve product quality, reduce the occurrence of sticky mold and strain and sticky aluminum, reduce the use of mold release agent, but also reduce the loss of the top bar and core due to overheating of the bearing block temperature.
(2) bearing seat 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 cracking, more complex bearing seat can be used torch, liquefied gas, good conditions with mold temperature machine, relatively simple bearing seat can use slow pressure shot preheat.
(3) of the bearing seat parting surface cleanup, which is very laborious, but also easy to ignore, the operator should apply kerosene to the bearing seat parting surface cleaning once, not only to prevent the bearing seat will not be squeezed, and after cleaning, the bearing seat was released by the residue or other dirt blocked exhaust slot open, conducive to the pressure injection process in the cavity gas discharge to improve product quality.
(4) If the bearing seat is equipped with neutron control, it is noted that the signal line between the die-casting machine and the bearing seat is absolutely prohibited to have a joint phenomenon, the reason is clear, in daily production, it is difficult to avoid the signal line with water, or the joint wrapping place is easy to break, thus causing a short connection with the machine, if the signal error, the light alarm automatically stop delay, heavy signal disorder, the bearing seat top bad, resulting in unnecessary losses.
6、How to clean and inspect split bearing housings?
Bearing housing installation before, should also be into a comprehensive cleaning inspection. The bearing housing cavity with a scraper to scrape away the dirt, using a cloth dipped in gasoline or solvent to wipe the dirt, see if there are cracks and sand holes, in order to prevent oil seepage in operation.
Bearing cover and bearing seat joint surface, bearing seat and bearing oil ring combination surface should be scraped with the research, and check with a ruler, the gap shall not be greater than 0.03 mm. The surface of the base plate where the bearing seat is placed should also be cleaned up, there should be no bruises, rust and burrs. Fasten the bearing seat screw and seat plate threads are to he fine check, and try to screw check whether too tight or bald buckle.
7、What are the installation steps for split bearing housings?
In machinery and equipment bearing has always been a very important part, before the installation of bearings to install the bearing housing, after the bearing can be installed.
Speaking of bearing housing installation method, you know how to install the bearing housing? Next I want to introduce you to some of the correct installation steps of the bearing seat, only the correct installation of the bearing seat, you can do the corresponding bearing installation work.
Before installation, first the lower part of the vertical bearing housing body temporarily fixed in the frame, the fixed side of the bearing and seal and positioning ring together in the lower part of the vertical bearing housing body assembly, adjust the position of the vertical bearing housing since the right bearing, the bearing will be installed in the middle of the bearing housing. Especially in the case of high temperature use, the expansion of the shaft should be considered to determine the position of the bearing.
After the bearing position is determined, confirm the straight angle between the vertical bearing housing and the shaft (the inner ring and the outer ring of the bearing are kept parallel on the side), and then fix the nut sufficiently. When the mounting error is too large, it will happen that the seal is not normal at the seal, or the shaft touches the caliber part causing the smooth operation. In this case, please adjust the mounting seat first, and then install it.
Installation to check and confirm that the bearing bit size and shape are accurate, check to ensure the roughness of the bearing seat seat surface, install all parts located between the two bearing seats on the shaft, and ensure that the bearing seat connection surface has been cleaned of paint and contaminants, assemble the seal, give the shaft a thin layer of oil, and install the bearing seat on the shaft.
In recent years, China's machinery industry is developing better and better, due to the widespread use of bearings, bearing housing has also been a very large range of applications. In machinery and equipment, people often attach great importance to the installation of bearings, in fact, the installation of the bearing housing is not to be ignored, only the correct installation of the bearing housing, can do the next job.
8、What are the common problems with split bearing housings?
Wear as the most common problems with bearing housings, bearing housing wear phenomenon also occurs from time to time. The traditional method generally uses the overlay welding after machining to repair, and the overlay welding will make the surface of the parts to reach a very high temperature, resulting in component deformation or cracking, through machining to obtain the size of the downtime caused by greatly extended.
The use of polymer composite materials for on-site repair, both no heat impact, repair thickness is not limited, the wear resistance of the product and the metal material does not have the yield, to ensure that the repair parts 100% contact with, reduce the impact vibration of the equipment, to avoid the possibility of wear, on-site repair, to avoid the method of machining.
Generally only four steps: surface treatment, the need to repair the bearing seat surface in addition to oil and dirt, in addition to moisture; blending and repair materials; coating materials, the material is evenly coated in the bearing seat repair parts, filling solid; waiting for material curing, can be appropriate heating material surface to accelerate material curing.
General bearing seat wear in 3-6 hours can be repaired, the operation is easy to learn, no special equipment and special training, compared to laser welding, cold welding and other technologies to save time and effort, the cost is only 1/5-1/10 of the general repair costs, on-site repair is to reduce the equipment maintenance time and transportation costs.
|Bearing No.||Locating ring||H||A1||Ca||Da||da||H1||J||L||N|
|SONL 240-540||2 x FRB 14/360||510 mm||260 mm||126 mm||360 mm||182.563 mm||275 mm||600 mm||730 mm||50 mm|
|SONL 244-544||2 x FRB 14/400||565 mm||280 mm||136 mm||400 mm||201.613 mm||305 mm||670 mm||820 mm||50 mm|
|SONL 238-538||2 x FRB 14/340||480 mm||250 mm||120 mm||340 mm||190 mm||260 mm||590 mm||720 mm||50 mm|
|SONL 234-534||2 x FRB 14/310||440 mm||230 mm||114 mm||310 mm||170 mm||235 mm||515 mm||610 mm||42 mm|
|SONL 248-548||2 x FRB 14/440||625 mm||290 mm||148 mm||440 mm||240 mm||340 mm||740 mm||900 mm||50 mm|
|SONL 236-536||2 x FRB 14/320||455 mm||240 mm||114 mm||320 mm||180 mm||245 mm||545 mm||650 mm||42 mm|
|SNL 516 TURU||2 x FRB 12,5/140||177 mm||90 mm||58 mm||140 mm||70 mm||95 mm||260 mm||315 mm||28 mm|
|FSNL 519 TURU||2 x FRB 12,5/170||212 mm||100 mm||68 mm||170 mm||85 mm||112 mm||290 mm||345 mm||24 mm|
|SNL 520 TURU||2 x FRB 12/180||218 mm||110 mm||70 mm||180 mm||90 mm||112 mm||320 mm||380 mm||32 mm|
|SNL 524 TURU||2 x FRB 5/215||271 mm||120 mm||86 mm||215 mm||110 mm||140 mm||350 mm||410 mm||32 mm|
|SNL 518 TURU||2 x FRB 6,25/160||194 mm||100 mm||65 mm||160 mm||80 mm||100 mm||290 mm||345 mm||28 mm|
|SNL 619 TURU||2 x FRB 6,5/200||242 mm||120 mm||80 mm||200 mm||85 mm||125 mm||350 mm||410 mm||32 mm|
|SNL 617 TURU||2 x FRB 5/180||218 mm||110 mm||70 mm||180 mm||75 mm||112 mm||320 mm||380 mm||32 mm|
|SNL 615 TURU||2 x FRB 5/160||194 mm||100 mm||65 mm||160 mm||65 mm||100 mm||290 mm||345 mm||28 mm|
|FSNL 616 TURU||2 x FRB 5/170||212 mm||100 mm||68 mm||170 mm||70 mm||112 mm||290 mm||345 mm||24 mm|
|FSNL 532 TURU||2 x FRB 5/290||344 mm||160 mm||114 mm||290 mm||140 mm||170 mm||470 mm||550 mm||32 mm|
|SNL 616 TURU||2 x FRB 5/170||212 mm||100 mm||68 mm||170 mm||70 mm||112 mm||290 mm||345 mm||28 mm|
|SNL 620 TURU||2 x FRB 19,5/215||271 mm||120 mm||86 mm||215 mm||90 mm||140 mm||350 mm||410 mm||32 mm|
|SNL 613 TURU||2 x FRB 5/140||177 mm||90 mm||58 mm||140 mm||60 mm||95 mm||260 mm||315 mm||28 mm|
|SNL 532 TURU||2 x FRB 17/290||344 mm||160 mm||114 mm||290 mm||140 mm||170 mm||470 mm||550 mm||42 mm|
SKF Bearing Cross References
|Product Number||Locating ring||H||A1||Ca||Da||da||H1||J|
|SNL 3060 TURT||2 x FRB 25/460||551 mm||280 mm||168 mm||460 mm||280 mm||280 mm||670 mm|
|SNL 3060 G||2 x FRB 25/460||551 mm||280 mm||168 mm||460 mm||300 mm||280 mm||670 mm|
|SNL 3080 ATURA||2 x FRB 22/600||695 mm||360 mm||192 mm||600 mm||380 mm||350 mm||840 mm|
|SNL 3176 TURA||2 x FRB 10/620||715 mm||360 mm||214 mm||620 mm||360 mm||360 mm||870 mm|
|SNL 3038 ATURT||4 x FRB 10/290||353 mm||190 mm||115 mm||290 mm||170 mm||180 mm||450 mm|
|SNL 3164 TURA||2 x FRB 10/540||631 mm||330 mm||196 mm||540 mm||300 mm||320 mm||750 mm|
You Need To Know Bearing Technology
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- TIMKEN 07100 Cross Reference +
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- NGK 8 Cross Reference +
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- R8RS Bearing Cross Reference +
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- 1635 Bearing Cross Reference +
- The bearing type of 1635 bearings is open deep groove ball bearing. It is generally composed of a pair of ferrules, a group of cages and a group of steel balls.
- STA4195 Bearing Cross Reference +
- KOYO STA4195 tapered roller bearing carry combinations of large radial and thrust loads. The axial load carrying capacity of the bearings is largely determined by the contact angle. The larger the angle, the higher the axial load capacity.
- 7r8 Bearing Cross Reference +
- 7r8 bearing is the most representative deep groove ball bearings with a wide range of applications. It is suitable for high-speed or even extremely high-speed operation, and it is very durable without regular maintenance.
- 6203lu Bearing Cross Reference +
- NSK 6203DUL1 bearings are the most widely used bearings and utilize an uninterrupted raceway, which makes these bearings suitable for radial loads, or a combination of thrust and radial loads.