Spherical roller bearings
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- Ιάνθη Κορνάρος
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2 Spherical roller bearings Standard bearings Open bearings Sealed bearings Bearings for vibratory applications SKF Explorer class bearings Special bearings Bearings on sleeves Appropriate bearing housings Bearing data general Dimensions Tolerances Internal clearance Misalignment Influence of operating temperature on bearing material Axial load carrying capacity Minimum load Equivalent dynamic bearing load Equivalent static bearing load Supplementary designations Mounting bearings with a tapered bore Measuring the clearance reduction Measuring the lock nut tightening angle Measuring the axial drive-up Measuring the inner ring expansion Additional mounting information Product tables Spherical roller bearings Sealed spherical roller bearings Spherical roller bearings for vibratory applications Spherical roller bearings on adapter sleeve Spherical roller bearings on withdrawal sleeve
3 Spherical roller bearings Spherical roller bearings have two rows of rollers with a common sphered raceway in the outer ring and two inner ring raceways inclined at an angle to the bearing axis ( fig. 1). This gives them an attractive combination of design features, making them irreplaceable in many demanding applications. They are self-aligning and consequently insensitive to misalignment of the shaft relative to the housing and to shaft deflection or bending. SKF spherical roller bearings are leading in design and can, in addition to heavy radial loads, accommodate heavy axial loads acting in both directions. Fig. 1 Standard bearings The standard range of SKF spherical roller bearings comprises open bearings sealed bearings bearings for vibratory applications. In addition to the standard range, SKF offers a wide range of special spherical roller bearings adapted for specific applications. Open bearings SKF spherical roller bearings are produced to several designs, depending on bearing series and size. The differences are the arrangement of the floating guide ring as well as the design of the inner ring and/or cages, as described in the following ( fig. 2). C(J), CC Two pressed window-type steel cages, flangeless inner ring and guide ring centred on the inner ring (a). EC(J), ECC(J) Reinforced roller complement, two pressed window-type steel cages, flangeless inner ring, guide ring centred on the inner ring (a). CA CAF ECA, ECAC ECAF E CAFA CAMA One-piece machined brass cage, double-pronged, retaining flanges on the inner ring and guide ring centred on the inner ring (b). As CA, but with a steel cage. Reinforced roller complement, one-piece machined brass cage, double-pronged, retaining flanges on the inner ring, guide ring centred on the inner ring (b). As ECA, but with a steel cage. For bearings with a bore diameter d 65 mm: Two pressed window-type steel cages, flangeless inner ring and guide ring centred on the inner ring (c). For bearings with a bore diameter d > 65 mm: Two pressed window-type steel cages, flangeless inner ring and guide ring centred on the cages (d). One-piece machined steel cage, double-pronged, centred on the outer ring raceway, retaining flanges on the inner ring and guide ring centred on the inner ring (e). As CAFA, but with a brass cage. 696
4 With some exceptions, all SKF spherical roller bearings are produced with a cylindrical bore as well as with a tapered bore. The tapered bore of bearings in the Fig , 241, 248 and 249 series have a taper of 1:30, designation suffix K30, and the other series have a taper of 1:12, designation suffix K. Annular groove and lubrication holes To facilitate efficient bearing lubrication, SKF spherical roller bearings are provided with an annular groove and three lubrication holes in the outer ring ( fig. 3a), designation suffix W33, or three lubrication holes in the outer ring ( fig. 3b), designation suffix W20. E-design spherical roller bearings have the annular groove and three lubrication holes feature as standard so that the designation suffix W33 is omitted from the bearing designation. a c b d e Fig. 3 a b 697
5 Spherical roller bearings Sealed bearings A selection of SKF spherical roller bearings is also produced in a sealed version with contact seals on both sides ( fig. 4). The seals are reinforced with sheet steel and made of an oil and wear-resistant acrylonitrile-butadiene rubber (NBR), designation suffix 2CS hydrogenated acrylonitrile-butadiene rubber (HNBR), designation suffix 2CS5 fluoro rubber (FKM), designation suffix 2CS2. The seals are inserted in recesses in the outer ring. For smaller bearing sizes, the seals are pressed into the recesses (a), while the seals for the larger sizes are held in position by means of retaining rings (b). The seals have two sealing lips contacting the lead-in at the sides of the inner ring raceway, to provide efficient sealing. Sealed bearings are lubricated as standard with an extreme-pressure bearing grease according to table 1. They should not be heated to temperatures above 80 C during mounting, and should not be washed. SKF standard grease filling for sealed spherical roller bearings Technical specification Grease for sealed bearings of type 2CS, 2CS2/VT143 and 2CS5/VT143 Table 1 Type Extreme pressure grease Thickener Lithium Base oil type Mineral NLGI consistency class 2 Temperature range, C 1) 20 to +110 Base oil viscosity, mm 2 /s at 40 C 200 at 100 C 16 Filling degree, % of free space in the bearing 25 to 35 1) For safe operating temperature, section Temperature range the SKF traffic light concept, starting on page 232 Fig. 4 Fig. 5 a b 698
6 a b Fig. 6 Sealed bearings do not need to be relubricated when the operating temperature does not exceed 70 C and the rotational speed is below 50 % of the limiting speed listed in the product table. When temperature and/or speeds are high, relubrication with a similar grease with lithium thickener is recommended ( table 1). In this case the polymer band, which covers the lubrication holes in the outer ring must be removed before mounting ( fig. 5). Note that only a small amount of grease is needed to relubricate sealed bearings. The grease should be pressed in slowly through the lubrication holes in the outer ring while the bearing is rotating. Excessive pressure should be avoided so as not to damage the seals. The internal design of a sealed bearing corresponds to that of an open bearing. The external dimensions are also the same except for bearings based on the 222 and 223 series. These bearings are slightly wider and carry the series designation BS2-22 and BS2-23 respectively. Sealed bearings are available with a cylindrical bore as standard. However most bearings in the BS2-22 series are available with a tapered bore as well. Every sealed bearing can be supplied with a tapered bore to special order. To prevent interference with the seal, the diameter of the shaft abutment should not exceed d a max at least for the 1 to 2 mm closest to the bearing ( fig. 6a). If the bearings are secured axially on the shaft by a lock nut, SKF recommends using a KMFE lock nut ( fig. 6b) or to position an intermediate ring between the bearing and the lock nut ( fig. 6c). c Warning Seals made of fluoro rubber exposed to extreme temperatures above 300 C give off hazardous fumes. Therefore the safety recommendations mentioned in the section Seal materials, starting on page 142, must be considered. 699
7 Spherical roller bearings Bearings for vibratory applications Vibratory applications, such as vibrating screens or exciters, induce accelerations of rollers and cages in the bearings. This puts extra demands on the bearing design. SKF spherical roller bearings for vibratory applications can withstand considerably higher accelerations than corresponding standard bearings. The permissible acceleration depends on the lubricant and the type of acceleration rotating or linear acceleration. Fig. 7 Rotating acceleration The bearing is subjected to a rotating outer ring load and a rotating acceleration field. This generates cyclic loads on the cages from the unloaded rollers. Typical examples are vibrating screens and planetary gears. Road rollers are subject to a mix of rotating and linear accelerations ( fig. 7a). Individual values for the permissible rotating accelerations are provided in the product table and are valid for oil lubricated bearings. The values are expressed in m/s 2, where 28 g stands for 28 9,81 = 275 m/s 2, for example. a b Linear acceleration The bearing is subjected to impact loads and thus linear accelerations. This causes hammering in the cage pockets by the unloaded rollers. A typical linear acceleration is generated when rail wheels are rolling over rail joints ( fig. 7b). An analogous application using bearings for vibrating applications is a road roller where the roller is vibrating against a relatively hard surface. Individual values for the permissible linear accelerations are provided in the product table and are valid for oil lubricated bearings. The values are expressed in m/s 2, where 90 g stands for 90 9,81 = 883 m/s 2, for example. a Fig. 8 b c 700
8 Bearing design SKF spherical roller bearings for vibratory applications have the same dimensions and performance values as bearings in the 223 series but have a C4 radial internal clearance as standard. They are available with either a cylindrical or tapered bore. To facilitate efficient lubrication all bearings are provided with an annular groove and three lubrication holes in the outer ring. SKF spherical roller bearings for vibratory applications are, depending on their size, available in one of the designs described in the following ( fig. 8). E/VA405 (bearings with d 65 mm) Two surface hardened window-type steel cages, flangeless inner ring and guide ring centred on the inner ring. E/VA 405 (bearings with d > 65 mm) Two surface hardened window-type steel cages, flangeless inner ring and guide ring centred on the cages (a). EJA/VA405 and CCJA/W33VA405 Two surface hardened window-type steel cages for bearings of EJA design (b) or CCJA design (c), flangeless inner ring and guide ring centred on the outer ring raceway. SKF Explorer class bearings High performance SKF Explorer spherical roller bearings are shown with an asterisk in the product tables. SKF Explorer bearings retain the designation of the earlier standard bearings, e.g E. However, each bearing and its box are marked with the name EXPLORER. Special bearings SKF produces a wide range of special spherical roller bearings to meet specific customer needs. These are, for example, bearings for printing machines, paper mills or coaters in high precision execution very arduous operating conditions as for example in continuous casting machines high temperature applications mounting with loose fit on roll necks railway vehicles. For detailed information on these spherical roller bearings please contact SKF. EJA/VA406 and CCJA/W33VA406 These bearings have a PTFE coated cylindrical bore and have the same features as a VA405 design bearing. These bearings are intended for the non-locating bearing position in vibratory applications to prevent fretting corrosion between the shaft and the bore of the bearing. Shafts do not require special heat treatments or coatings. System solutions for vibrating screens In addition to single bearings for vibrating screens, SKF has developed fault detection and bearing systems that can extend performance, reduce maintenance and monitor machine condition in vibratory equipment. More information on this SKF Copperhead system solution for vibrating screens can be found on page
9 Spherical roller bearings Fig. 9 Bearings on sleeves Spherical roller bearings with a tapered bore can be mounted on smooth or stepped shafts using an adapter sleeve ( fig. 9), product table starting on page 748 a withdrawal sleeve ( fig. 10), product table starting on page 762. Fig. 10 The sleeves facilitate bearing mounting and dismounting and often simplify bearing arrangement design. When sealed bearings are to be mounted on an adapter sleeve it is necessary to protect the sealing lips from being damaged. This can be done by using an E-design adapter sleeve ( section Adapter sleeves, starting on page 975) inserting an intermediate ring between the bearing and the locking washer ( fig. 11). Fig
10 Appropriate bearing housings The combination of a spherical roller bearing and an appropriate bearing housing constitutes an economic, interchangeable and reliable bearing arrangement that meets the demands for easy maintenance. SKF produces appropriate housings in a variety of designs and sizes to suit a wide range of applications. The designs include Fig. 12 split plummer (pillow) block housings one-piece plummer (pillow) block housings flanged housings take-up housings. Detailed information on plummer block housings in the SNL 2, 3, 5 and 6 series ( fig. 12) can be found in the section Bearing housings, starting on page A brief description of all SKF housings is also provided in the section Bearing housings where only main design features are presented. Publications for detailed information are listed. 703
11 Spherical roller bearings Bearing data general Dimensions The boundary dimensions for spherical roller bearings are in accordance with ISO 15:1998. The dimensions of the adapter and withdrawal sleeves correspond to ISO :1995. Tolerances SKF spherical roller bearings are manufactured as standard to Normal tolerances. SKF Explorer spherical roller bearings up to and including 300 mm bore diameter are, however, produced to higher precision than the ISO Normal tolerances. For example the width tolerance is considerably tighter than the ISO Normal tolerance ( table 2) the running accuracy is to tolerance class P5 as standard. For larger bearing arrangements where running accuracy is a key operational parameter, SKF spherical roller bearings with P5 running accuracy are also available. These bearings are identified by the suffix C08. Their availability should be checked. The tolerance for the bore and the outside diameter of SKF Explorer spherical roller bearings for vibratory applications have been reduced from Normal to P5 and P6 respectively. The values of the tolerances are in accordance with ISO 492:2002 and can be found in tables 3 to 5, starting on page 125. Table 2 Width tolerances for SKF Explorer spherical roller bearings with bore up to and including 300 mm Bore Width tolerances diameter according to d SKF ISO Standard Standard D Bs D Bs over incl. high low high low mm μm Internal clearance SKF spherical roller bearings are produced as standard with Normal radial internal clearance and most are also available with a greater C3 clearance. Many bearings can also be supplied with a smaller C2 clearance or the much greater C4 or C5 clearances. SKF spherical roller bearings for vibratory applications are produced as standard with C4 clearance. The radial internal clearance limits are listed for bearings with cylindrical bore in table 3 and with tapered bore in table 4. The clearance limits are in accordance with ISO 5753:1991 and are valid for bearings before mounting under zero measuring load. 704
12 Table 3 Radial internal clearance of spherical roller bearings with a cylindrical bore Bore Radial internal clearance diameter C2 Normal C3 C4 C5 d over incl. min max min max min max min max min max mm μm Please refer to page 137 for the definition of radial internal clearance 705
13 Spherical roller bearings Table 4 Radial internal clearance of spherical roller bearings with a tapered bore Bore Radial internal clearance diameter C2 Normal C3 C4 C5 d over incl. min max min max min max min max min max mm μm Please refer to page 137 for the definition of radial internal clearance 706
14 Misalignment The design of spherical roller bearings is such that they are inherently self-aligning, i.e. angular misalignment between the outer ring and inner ring can be accommodated without any negative effect on bearing performance. Under normal operating conditions (load ratios of C/P > 10) and when misalignment is constant in position with respect to the outer ring, the guideline values for permissible misalignment provided in table 5 apply. Whether these values can be fully exploited or not depends on the design of the bearing arrangement, the type of seals used etc. When the position of the misalignment is not constant with respect to the bearing outer ring, e.g. in vibrating screens with rotating imbalance and therefore rotating deflection of the shaft ( fig. 13) deflection-compensating rolls of paper machines where the stationary shaft is bent, additional sliding is caused in the bearing under the operating conditions. Therefore, with reference to bearing friction and associated heat generation, it is recommended that misalignment of the inner ring with respect to the outer ring should not exceed a few tenths of a degree. Sealed bearings can accommodate angular misalignments of the shaft with respect to the housing of up to approximately 0,5. Provided the guideline value is not exceeded, there will be no detrimental effect on the efficiency of the seals. Permissible angular misalignment Bearing Permissible series angular Sizes 1) misalignment degrees Series Series 222 Sizes < 52 2 Sizes 52 1,5 Series Series 230 Sizes < 56 2 Sizes 56 2,5 Series 231 Sizes < 60 2 Sizes 60 3 Series 232 Sizes < 52 2,5 Sizes 52 3,5 Series 238 1,5 Series 239 1,5 Series Series 241 Sizes < 64 2,5 Sizes 64 3,5 Series 248 1,5 Series 249 2,5 1) Last two figures of bearing designations Table 5 Fig
15 Spherical roller bearings Influence of operating temperature on bearing material All SKF spherical roller bearings undergo a special heat treatment so that they can be operated at higher temperatures for longer periods, without the occurrence of inadmissible dimensional changes. For example, a temperature of +200 C for h, or for short periods at even higher temperatures, is permitted. Axial load carrying capacity Because of their special internal design, SKF spherical roller bearings are able to accommodate heavy axial loads and even purely axial loads. Axial load carrying capacity of bearings mounted on an adapter sleeve If spherical roller bearings with adapter sleeves are mounted on smooth shafts with no fixed abutment, the magnitude of the axial load that can be supported is determined by the friction between the shaft and sleeve. Provided the bearings are correctly mounted, the permissible axial load can be calculated from F ap = 0,003 B d where F ap = maximum permissible axial load, kn B = bearing width, mm d = bearing bore diameter, mm Minimum load In order to provide satisfactory operation, spherical roller bearings, like all ball and roller bearings, must always be subjected to a given minimum load, particularly if they are to operate at high speeds or are subjected to high accelerations or rapid changes in the direction of load. Under such conditions, the inertia forces of the rollers and cage(s), and the friction in the lubricant, can have a detrimental influence on the rolling conditions in the bearing arrangement and may cause damaging sliding movements to occur between the rollers and raceways. The requisite minimum load to be applied to spherical roller bearings can be estimated using where P m = equivalent minimum load, kn C 0 = basic static load rating, kn ( product tables) In some applications it is not possible to reach or exceed the requisite minimum load. However, if the bearing is oil lubricated lower minimum loads are permissible. These loads can be calculated when n/n r 0,3 from P m = 0,003 C 0 and when 0,3 < n/n r 2 from q 7 n w P m = 0,003 C ,3 < p n r z where P m = equivalent minimum load, kn C 0 = basic static load rating, kn ( product tables) n = rotational speed, r/min n r = reference speed, r/min ( product tables) When starting up at low temperatures or when the lubricant is highly viscous, even greater minimum loads than P m = 0,01 C 0 may be required. The weight of the components supported by the bearing, together with external forces, generally exceeds the requisite minimum load. If this is not the case, the spherical roller bearing must be subjected to an additional radial load. NoWear spherical roller bearings have proven to give reliable operation at very low loads. They can withstand longer periods of insufficient lubrication, sudden variations in load and rapid speed changes ( page 943). P m = 0,01 C 0 708
16 Equivalent dynamic bearing load P = F r + Y 1 F a P = 0,67 F r + Y 2 F a when F a /F r e when F a /F r > e The values of the calculation factors e, Y 1 and Y 2 can be found in the product tables. Equivalent static bearing load P 0 = F r + Y 0 F a The value of the calculation factor Y 0 can be found in the product tables. Supplementary designations The designation suffixes used to identify certain features of SKF spherical roller bearings are explained in the following. The suffixes used to identify bearing (and cage) design, e.g. CC or E, are not included here as they are explained in the section Standard bearings on page 696. C2 C3 C4 C5 C08 C083 C084 2CS 2CS2 Radial internal clearance smaller than Normal Radial internal clearance greater than Normal Radial internal clearance greater than C3 Radial internal clearance greater than C4 Heightened running accuracy to ISO tolerance class 5 C08 + C3 C08 + C4 Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on both sides of the bearing. Annular groove and three lubrication holes in the outer ring covered with a polymer band. Lubricated with an extreme pressure bearing grease according to table 1 on page 698 Sheet steel reinforced contact seal of fluoro rubber (FKM) on both sides of the bearing. Annular groove and three lubrication holes in the outer ring; covered with a polymer band. Lubricated with a polyurea hightemperature grease 2CS5 Sheet steel reinforced contact seal of hydrogenated acrylonitrile-butadiene rubber (HNBR) on both sides of the bearing. Otherwise as 2CS2 HA3 Case-hardened inner ring K Tapered bore, taper 1:12 K30 Tapered bore, taper 1:30 P5 Dimensional and running accuracy to ISO tolerance class 5 P6 Dimensional and running accuracy to ISO tolerance class 6 P62 P6 + C2 VA405 Bearings for vibratory applications with surface hardened cages VA406 VA405 and PTFE-coated bore VE552(E) Outer ring with three equally spaced threaded holes in one side face to accommodate hoisting tackle; the E indicates that appropriate eye bolts are supplied with the bearings VE553(E) As VE552 but with threaded holes in both side faces VG114 Surface hardened pressed steel cage VQ424 VT143 Running accuracy better than C08 Grease fill with an extreme pressure grease according to table 1 on page 698 W Without annular groove and lubrication holes in outer ring W20 Three lubrication holes in the outer ring W26 Six lubrication holes in the inner ring W33 Annular groove and three lubrication holes in the outer ring W33X Annular groove and six lubrication holes in the outer ring W64 Solid Oil filling W77 Plugged W33 lubrication holes W513 W26 + W Case-hardened inner ring with helical groove in the bore 709
17 Spherical roller bearings Mounting bearings with a tapered bore Bearings with a tapered bore are always mounted with an interference fit. The reduction in radial internal clearance, or the axial displacement of the inner ring on its tapered seating is used as a measure of the degree of interference. Suitable methods for mounting spherical roller bearings with tapered bore are: Measuring the clearance reduction. Measuring the lock nut tightening angle. Measuring the axial drive-up. Measuring the inner ring expansion. Small bearings with a bore diameter up to 100 mm can be properly mounted by measuring the lock nut tightening angle. For larger bearings the SKF Drive-up Method is recommended. This method is more accurate and takes less time than the procedure based on clearance reduction or the lock nut tightening angle. Measuring the inner ring expansion, i.e. applying the SensorMount Method, enables large size bearings to be mounted simply, quickly and accurately, since a sensor is integrated into the bearing inner ring. Measuring clearance reduction The method using feeler gauges for measuring the radial internal clearance before and after mounting bearings is applicable for medium and large-sized bearings ( fig. 14). Before measuring, rotate the inner or outer ring a few times. Make sure that both bearing rings and the roller complement are centrically arranged with respect to each other. For the first measurement, a blade should be selected, that is slightly thinner than the minimum value for the clearance. During the measurement, the blade should be moved back and forth until it can be inserted to the middle of the roller. The procedure should be repeated, using slightly thicker blades each time, until a certain resistance is felt when moving between outer ring and uppermost roller (a) before mounting outer ring and lowest roller (b) after mounting. For large bearings, especially those having a rather thin-walled outer ring, the measurements may be affected by the elastic deformation of the rings, caused by the weight of the bearing or the force to draw the feeler gauge blade through the gap between the raceway and an unloaded roller. To establish in such cases the true clearance before and after mounting, the following procedure should be followed (c): Measure the clearance c at the 12 o clock position for a standing bearing or at the 6 o clock position for a bearing hanging on a journal. Measure clearance a at the 9 o clock position and b at the 3 o clock position without the bearing being moved. Fig. 14 a b c 710
18 Table 6 Recommended values for reduction of radial internal clearance, axial drive-up and lock nut tightening angle Bore Reduction of Axial drive-up 1) Residual 2) radial Lock nut diameter radial internal s clearance after tightening d clearance Taper Taper mounting bearings angle 1:12 1:30 with initial clearance a over incl. min max min max min max Normal C3 C4 Taper 1:12 mm mm mm mm degrees ,015 0,020 0,3 0,35 0,015 0,020 0, ,020 0,025 0,35 0,4 0,015 0,025 0, ,025 0,030 0,4 0,45 0,020 0,030 0, ,030 0,040 0,45 0, ,025 0,035 0, ,040 0,050 0,6 0,7 3,2 4,2 0,025 0,040 0, ,045 0,060 0,7 0,9 1,7 2,2 0,035 0,050 0, ,050 0,070 0,75 1,1 1,9 2,7 0,050 0,065 0, ,065 0,090 1,1 1,4 2,7 3,5 0,055 0,080 0, ,075 0,100 1,2 1, ,055 0,090 0, ,080 0,110 1,3 1,7 3,2 4,2 0,060 0,100 0, ,090 0,130 1,4 2 3,5 5 0,070 0,100 0, ,100 0,140 1,6 2,2 4 5,5 0,080 0,120 0, ,110 0,150 1,7 2,4 4,2 6 0,090 0,130 0, ,120 0,170 1,9 2,7 4,7 6,7 0,100 0,140 0, ,130 0, ,5 0,110 0,150 0, ,150 0,210 2,4 3,3 6 8,2 0,120 0,170 0, ,170 0,230 2,6 3,6 6,5 9 0,130 0,190 0, ,200 0,260 3,1 4 7,7 10 0,130 0,200 0, ,210 0,280 3,3 4,4 8,2 11 0,160 0,230 0, ,240 0,320 3,7 5 9,2 12,5 0,170 0,250 0, ,260 0, , ,5 0,200 0,290 0, ,300 0,400 4,6 6,2 11,5 15,5 0,210 0,310 0, ,340 0,450 5,3 7 13,3 17,5 0,230 0,350 0, ,370 0,500 5,7 7,8 14,3 19,5 0,270 0,390 0, ,410 0,550 6,3 8,5 15,8 21 0,300 0,430 0, ,450 0,600 6, ,320 0,480 0, ,490 0,650 7,4 9,8 18,5 25 0,340 0,540 0, ,550 0,720 8,3 10, ,360 0,590 0, ,600 0,800 9,1 11,9 22,7 29,8 0,400 0,650 0, ,670 0,900 10,2 13,4 25,4 33,6 0,440 0,720 1,020 1) Valid only for solid steel shafts and general application. Not valid for the SKF Drive-up Method 2) The residual clearance must be checked in cases where the initial radial internal clearance is in the lower half of the tolerance range, and where large temperature differentials between the bearing rings can arise in operation. 711
19 Spherical roller bearings Obtain the true radial internal clearance with relatively good accuracy from 0,5 (a + b + c). Fig. 15 Recommended values for reduction of radial internal clearance are provided in table 6 on page 711. Measuring the lock nut tightening angle Mounting small to medium-size bearings on tapered seatings is easy when the tightening angle a of the lock nut ( fig. 15) and the method that is described in the following is used. Recommended values for the tightening angle a are provided in table 6 on page 711. Before starting the final tightening procedure, the bearing should be pushed up on the tapered seating until the bore of the bearing or sleeve is in contact with the seating on the shaft around its whole circumference, i.e. the bearing inner ring cannot be rotated relatively to the shaft. By then turning the nut through the given angle a, the bearing will be pressed up the tapered seating. The residual clearance of the bearing should be checked, if possible. If using a KM nut, unscrew the nut and place the locking washer in position. Tighten the nut firmly again and lock it by bending one of the locking washer tabs into the nut slot. If using a KMFE nut, lock the nut by tightening the grub screw with the recommended tightening torque. d a Fig. 16 Measuring the axial drive-up Mounting bearings with a tapered bore can be done by measuring the axial drive-up of the inner ring on its seating. Recommended values for the required axial drive-up s for general applications are provided in table 6 on page 711. The most suitable method in this case is the SKF Drive-up Method. This mounting method provides a very reliable and easy way to determine the starting position for a bearing from which the axial displacement is to be measured. For that, the following mounting tools ( fig. 16) must be used c b a pressure gauge (c), appropriate to the mounting conditions a dial gauge (d). an SKF hydraulic nut of the HMV.. E design (a) a hydraulic pump (b) 712
20 zero position starting position final position Fig. 17 Applying the SKF Drive-up Method, the bearing is pushed up its seating to a defined starting position ( fig. 17) using a given oil pressure (corresponding to a given drive-up force) in the hydraulic nut. In this way, part of the desired reduction in radial internal clearance is achieved. The oil pressure is monitored by the pressure gauge. The bearing is then driven up from the defined starting position through a given distance to its final position. The axial displacement s s is accurately determined using the dial gauge mounted on the hydraulic nut. SKF has determined values of the requisite oil pressure and the axial displacement for individual bearings. These values apply to bearing arrangements ( fig. 18) with one sliding interface (a) and (b) or two sliding interfaces (c). Fig. 18 a b c 713
21 Spherical roller bearings Measuring the inner ring expansion Measuring inner ring expansion enables largesize spherical roller bearings with a tapered bore to be mounted simply, quickly and accurately without measuring the radial internal clearance before and after mounting. The SensorMount Method uses a sensor, integrated into the bearing inner ring, and a dedicated hand-held indicator ( fig. 19). The bearing is driven up the tapered seating using common SKF mounting tools. The information from the sensor is processed by the indicator. Inner ring expansion is displayed as the relationship between the clearance reduction (mm) and the bearing bore diameter (m). Aspects like bearing size, smoothness, shaft material or design solid or hollow do not need to be considered. For detailed information about the Sensor Mount Method please contact the SKF application engineering service. Additional mounting information Additional information on mounting spherical roller bearings in general or with the aid of the SKF Drive-up Method can be found in the handbook SKF Drive-up Method on CD-ROM in the SKF Interactive Engineering Catalogue online at online at Fig
22 715
23 Spherical roller bearings d mm Cylindrical bore Tapered bore Principal Basic load ratings Fatigue Speed ratings Mass Designations dimensions dynamic static load Refer- Limiting Bearing with limit ence speed cylindrical tapered d D B C C 0 P u speed bore bore mm kn kn r/min kg , ,28 * 22205/20 E , ,26 * E * EK ,4 41,5 4, , CC , ,29 * E * EK ,2 61 6, , CC CCK ,5 85 9, ,45 * E * EK ,6 72 8, , CC CCK ,5 90 9, ,53 * E * EK , ,75 * E * EK ,05 * E * EK , ,58 * E * EK , ,99 * E * EK , ,40 * E * EK , ,63 * E * EK , ,35 * E * EK ,90 * E * EK , ,84 * E * EK , ,70 * E * EK ,45 * E * EK , ,15 * E * EK , ,10 * E * EK , ,10 * E * EK , ,95 * CC/W33 * CCK30/W ,55 * E * EK ,55 * E * EK ,75 * E * EK , ,55 * E * EK , ,10 * E * EK ,55 * E * EK * SKF Explorer bearing 716
24 Dimensions Abutment and Calculation factors fillet dimensions d d 2 D 1 b K r 1,2 d a D a r a e Y 1 Y 2 Y 0 ~ ~ min min max max mm mm 20 31,2 44,2 3, ,6 46,4 1 0,35 1,9 2,9 1, ,2 44,2 3, ,6 46,4 1 0,35 1,9 2,9 1,8 35,7 50,7 1, ,30 2,3 3,4 2, ,5 53 3, ,6 56,4 1 0,31 2,2 3,3 2,2 43,3 58,8 1, ,27 2,5 3,7 2, ,5 61,8 3,7 2 1, ,31 2,2 3,3 2,2 47,2 65,6 1, ,5 0,28 2,4 3,6 2, ,1 69,4 5,5 3 1, ,28 2,4 3,6 2,5 59,9 79,8 5,5 3 1, ,5 0,24 2,8 4,2 2,8 49,7 74,3 5,5 3 1, ,5 0,37 1,8 2,7 1, ,4 74,4 5,5 3 1, ,26 2,6 3,9 2,5 65,3 88 5,5 3 1, ,5 0,24 2,8 4,2 2,8 56,4 83,4 5,5 3 1, ,5 0,37 1,8 2,7 1, ,9 79 5,5 3 1, ,24 2,8 4,2 2,8 71,6 96,8 5, ,24 2,8 4,2 2,8 62,1 91,9 5, ,37 1,8 2,7 1, ,3 88 5,5 3 1, ,5 0,24 2,8 4,2 2,8 71,6 96,2 5, ,24 2,8 4,2 2,8 70, , ,35 1,9 2,9 1, ,6 96,5 5,5 3 1, ,5 0,24 2,8 4,2 2,8 87, ,5 3 2, ,22 3 4,6 2,8 77, ,3 4,5 2, ,35 1,9 2,9 1, ,8 87,3 3,7 2 1, ,27 2,5 3,7 2,5 77, ,5 3 1, ,5 0,24 2,8 4,2 2,8 94, ,5 3 2, ,22 3 4,6 2,8 81, ,3 4,5 2, ,35 1,9 2,9 1, ,5 3 1, ,5 0,23 2,9 4,4 2, ,5 3 2, ,22 3 4,6 2,8 90, ,3 4,5 2, ,
25 Spherical roller bearings d mm Cylindrical bore Tapered bore Principal Basic load ratings Fatigue Speed ratings Mass Designations dimensions dynamic static load Refer- Limiting Bearing with limit ence speed cylindrical tapered d D B C C 0 P u speed bore bore mm kn kn r/min kg , ,55 * CC/W33 * CCK30/W , ,70 * E * EK , ,75 * E * EK ,55 * E * EK ,10 * E * EK ,45 * E * EK ,60 * E * EK , ,65 * E * EK ,20 * E * EK ,65 * E * EK ,40 * E * EK , ,65 * CC/W33 * CCK/W , ,10 * E * EK ,05 * E * EK , ,15 * E * EK ,05 * E * EK , ,5 * E * EK , ,15 * CC/W33 * CCK30/W ,55 * CC/W33 * CCK/W ,65 * CC/W33 * CCK30/W ,90 * E * EK , ,85 * CC/W33 * CCK/W ,60 * E * EK ,5 * E * EK , ,80 * CC/W33 * CCK/W ,00 * CC/W33 * CCK30/W ,75 * CC/W33 * CCK/W ,10 * CC/W33 * CCK30/W ,00 * E * EK , , ,85 * CC/W33 * CCK/W ,4 * E * EK * SKF Explorer bearing 718
26 Dimensions Abutment and Calculation factors fillet dimensions d d 2 D 1 b K r 1,2 d a D a r a e Y 1 Y 2 Y 0 ~ ~ min min max max mm mm 75 84, ,5 3 1, ,28 2,4 3,6 2,5 87, ,5 3 1, ,5 0,22 3 4,6 2, ,5 3 2, ,22 3 4,6 2,8 92, ,3 4,5 2, ,35 1,9 2,9 1, , , ,22 3 4,6 2, ,5 3 2, ,24 2,8 4,2 2,8 98, ,3 4,5 2, ,35 1,9 2,9 1, , ,22 3 4,6 2, , ,5 0,24 2,8 4,2 2, ,3 4, ,5 0, , ,24 2,8 4,2 2, , ,31 2,2 3,3 2, ,3 4, ,5 0,24 2,8 4,2 2, , ,5 0, ,3 4,5 2, ,24 2,8 4,2 2, ,3 4, ,5 0,24 2,8 4,2 2, , ,5 0, ,5 3 1, ,5 0,28 2,4 3,6 2, , ,30 2,3 3,4 2, , ,37 1,8 2,7 1, ,3 4,5 2, ,24 2,8 4,2 2, ,3 4,5 2, , ,3 4, ,5 0,24 2,8 4,2 2, , ,5 0, , ,23 2,9 4,4 2, , , ,3 4, ,30 2,3 3,4 2, , ,37 1,8 2,7 1, ,3 4,5 2, ,25 2,7 4 2, ,3 4,5 2, , ,9 7, ,5 0,
27 Spherical roller bearings d mm Cylindrical bore Tapered bore Principal Basic load ratings Fatigue Speed ratings Mass Designations dimensions dynamic static load Refer- Limiting Bearing with limit ence speed cylindrical tapered d D B C C 0 P u speed bore bore mm kn kn r/min kg ,20 * CC/W33 * CCK/W ,45 * CC/W33 * CCK30/W ,00 * CC/W33 * CCK/W ,3 * CC/W33 * CCK30/W , ,70 * E * EK ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,00 * CC/W33 * CCK/W , ,05 * CC/W33 * CCK30/W ,80 * CC/W33 * CCK/W ,0 * CC/W33 * CCK30/W ,0 * E * EK ,5 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,55 * CC/W33 * CCK/W ,55 * CC/W33 * CCK30/W ,5 * CC/W33 * CCK/W ,5 * CC/W33 * CCK30/W , ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W , ,95 * CC/W33 * CCK/W ,5 * CC/W33 * CCK30/W ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK30/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W33 * SKF Explorer bearing 720
28 Dimensions Abutment and Calculation factors fillet dimensions d d 2 D 1 b K r 1,2 d a D a r a e Y 1 Y 2 Y 0 ~ ~ min min max max mm mm , ,22 3 4,6 2, , ,30 2,3 3,4 2, ,3 4, ,28 2,4 3,6 2, , ,37 1,8 2,7 1, ,1 6 2, ,26 2,6 3,9 2, ,3 4,5 2, ,35 1,9 2,9 1, ,9 7, ,5 0,35 1,9 2,9 1, ,3 4, ,23 2,9 4,4 2, , ,31 2,2 3,3 2, ,3 4, ,28 2,4 3,6 2, , ,35 1,9 2,9 1, , ,5 0,27 2,5 3,7 2, ,3 4, ,5 0, , ,35 1,9 2,9 1, ,3 4, ,22 3 4,6 2, , ,30 2,3 3,4 2, ,3 4,5 2, ,28 2,4 3,6 2, ,3 4,5 2, ,35 1,9 2,9 1, , ,5 0,26 2,6 3,9 2, , ,5 0, , ,35 1,9 2,9 1, ,3 4,5 2, ,22 3 4,6 2, ,5 3 2, ,30 2,3 3,4 2, ,1 6 2, ,30 2,3 3,4 2, ,3 4,5 2, ,37 1,8 2,7 1, ,9 7, ,5 0,26 2,6 3,9 2, , ,5 0,35 1,9 2,9 1, , ,35 1,9 2,9 1,8 721
29 Spherical roller bearings d mm Cylindrical bore Tapered bore Principal Basic load ratings Fatigue Speed ratings Mass Designations dimensions dynamic static load Refer- Limiting Bearing with limit ence speed cylindrical tapered d D B C C 0 P u speed bore bore mm kn kn r/min kg ,70 * CC/W33 * CCK/W ,0 * CC/W33 * CCK30/W ,5 * CC/W33 * CCK/W ,0 * CC/W33 * CCK30/W ,5 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK30/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK30/W ,5 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W , , CC/W CCK/W ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK30/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK30/W ,5 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W , , CC/W CCK/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK30/W ,0 * CC/W33 * CCK/W ,0 * CC/W33 * CCK30/W ,5 * CC/W33 * CCK/W ,0 * CC/W33 * CCK/W ,5 * CC/W33 * CCK/W33 * SKF Explorer bearing 722
30 Dimensions Abutment and Calculation factors fillet dimensions d d 2 D 1 b K r 1,2 d a D a r a e Y 1 Y 2 Y 0 ~ ~ min min max max mm mm ,1 6 2, ,22 3 4,6 2, ,3 4,5 2, ,30 2,3 3,4 2, ,9 7,5 2, ,30 2,3 3,4 2, ,3 4,5 2, ,40 1,7 2,5 1, ,9 7, ,5 0,26 2,6 3,9 2, ,9 7, ,5 0,35 1,9 2,9 1, , ,35 1,9 2,9 1, ,1 6 2, ,23 2,9 4,4 2, ,3 4,5 2, , ,9 7,5 2, ,30 2,3 3,4 2, ,3 4,5 2, ,37 1,8 2,7 1, , ,27 2,5 3,7 2, ,9 7, ,35 1,9 2,9 1, , , , ,18 3,8 5,6 3, ,9 7,5 2, ,24 2,8 4,2 2, ,3 4,5 2, , ,9 7, ,5 0,30 2,3 3,4 2, , ,5 0,37 1,8 2,7 1, , ,26 2,6 3,9 2, ,9 7, ,35 1,9 2,9 1, , ,35 1,9 2,9 1, , ,16 4,2 6, ,9 7,5 2, ,23 2,9 4,4 2, ,3 4,5 2, ,31 2,2 3,3 2, ,9 7, ,5 0,31 2,2 3,3 2, , ,5 0,40 1,7 2,5 1, , ,26 2,6 3,9 2, , ,35 1,9 2,9 1, , ,35 1,9 2,9 1,8 723
,2 28,17 34,7 1,35 1,12 2,06 0,6 0,4 14,2 25,8 36 1,5 3,18 0,6 0,025 13
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