ntn spherical plain bearings contents technical data 1 types of spherical plain bearings 3 2 tolerances of spherical plain bearings 4 3 loads acting on spherical plain bearings 6 4 selection of spherical plain bearings 7 5 life of spherical plain bearings9 6 recommended fit and internal clearance 11 7 cautions to installation 12 bearing tables spherical plain bearings self-lubricating type series sar1/sar1 ss 13 series sar4 14 series sar2 inch size 15 lubricating type series sa1/sa1 ss 16 series sa4 18 series sa2 inch size 20 thrust spherical plain bearings lubricating type series sat 22 self-iubrication type lubrication type lubrication type thrust bushing 2
|
ntn spherical plain bearings 2 tolerances of spherical plain bearings definitions the symbols used in the tolerance table are defined as follows symbols d dmp vdp vdmp bs d dmp vdp vdmp cs ts bearing bore diameter nominal single plane mean bore diameter deviation bore diameter variation in a single radial plane mean bore diameter variation deviation of a single width of the inner ring bearing outside diameter nominal single plane mean outside diameter deviation outside diameter variation in a single radial plane mean outside diameter variation deviation of a single width of the outer ring deviation of mean height of thrust spherical plain bearings table 1 gives the dimensions of oil holes and grooves in the inner rings and the outer rings two equally spaced oil holes are provided four equally spaced oil holes are provided if the nominal bearing outside diameter exceeds 200mm 7.8740 inch table 1 dimensions of lubrication grooves and holes d mm over 30 50 65 80 120 incl 30 50 65 80 120
|
ntn spherical plain bearings 3 loads acting on spherical plain bearings 3.1 equivalent radial load loads applying to spherical plain bearings include a radial load that is a load acting vertically to the axis of the bearing and a thrust load which acts parallel to it arbitary directions of the load must be divided into radial and thrust loads and an equivalent radial load is obtained by the following formula 1 pr fr yfa 1 where in pr equivalent radial load n lbf fr radial load n lbf fa thrust load n lbf y axial load factor axial load factors y to be used are shown in table 4 below in the case of the self-lubricating type however the thrust load should not exceed the permissible axial loads pt mentioned in the dimension table table 4 axial load factor y fa fr bearing types self-lubrication type lubrication type 0.1 1 1 0.2 2 2 0.3 3 3 4 0.4 0.5 unfit 5 unfit 0.5 3.2 fluctuating load when the magnitude of load applied to the bearing is not constant but is subject to simple perio
|
ntn spherical plain bearings 4.4 static load and load rating in cases where the load applied to the bearing is static or where the bearing undergoes oscillating movement only at rare intervals the limiting maximum load applied to the bearing is as shown in table 6 table 6 limit loads for static use bearing type self-lubricating type permissible load max 1.5 times cd remarks the influence of temperature must be taken into account refer to formula 3 for general use applicable where the frequency of use is very low and the bearing is well lubricated 1/6 of cs lubrication type 1/4 of cs cd dynamic load rating cs static load rating where a static load close to cs is applied it is also necessary to review the strength of the shaft ft /min m/min 8.0 7.0 2.0 6.0 sliding speed v 5.0 4.0 3.0 0.8 permissible range 2.0 0.4 1.0 0 0 1.6 2.4 1.2 0.2 0.4 p cd 0.6 0.8 1 fig 2 permissible p v value curve 8
|
ntn spherical plain bearings bearing sizes nominal bore 300 280 260 240 220 200 180 160 140 120 110 100 90 80 70 60 50 45 40 35 30 25 22 20 16 14 12 25 20 17 15 cd p 1 initial service life l1 number of oscillations 100 speed factor fn 0.01 150 130 120 15 110 100 95 85 90 80 75 70 65 60 55 50 45 40 35 30 96 80 76 72 68 64 60 56 52 48 44 40 36 32 28 24 22 20 oscillation angle ° 200 150 2 500 3 1000 0.02 0.03 0.04 0.05 100 80 60 50 40 30 4 5 6 5 103 104 5 105 104 0.1 20 15 0.2 0.3 0.4 0.5 10 8 6 5 4 3 1 2 2 1 3 4 7 8 9 10 11 12 15 5 106 105 ¤ 5 107 106 auxiliary line 12 10 auxiliary line 20 25 30 5 107 108 sa4 sa2 sa1 oscillation angle example sa1-20b load condition cd =6 p 50 40 30 20 15 25° 10 l1 zw 6° 8° 10° 15° 20° oscillation angle 10° speed factor fn 0.5 initial service life l1 in this instance works out as l1 5 105 times when a bearing of the sa4 series is used move the sa4 scale to the position of the sa1 scale and then connect its size number with its cd value p 5 2 1 fig 5
|
ntn spherical plain bearings 6.2 internal bearing clearance internal clearance of ntn self-lubricating type and lubrication type spherical plain bearings are shown in table 10 table 10 internal clearance nominal bore d mm over 6 10 18 30 50 80 120 180 250 incl 10 18 30 50 80 120 180 250 315 over 0.2362 0.3937 0.7087 1.1811 1.9685 3.1496 4.7244 7.0866 9.8425 inch incl 0.3937 0.7087 1.1811 1.9685 3.1496 4.7244 7.0866 9.8245 12.4016 m 8 10 12 15 18 min 0.0001 inch 3 4 4.5 6 7 m 32 40 50 60 72 srelf-lubricating type max 0.0001 inch 13 16 20 24 28 m 50 50 60 70 80 100 120 170 200 min 0.0001 inch 20 20 24 28 31 39 47 67 79 m 80 90 100 120 150 180 210 270 310 lubrication type max 0.0001 inch 31 35 39 47 59 71 83 106 122 notes tolerance in inchs are converted from the original figures specified in µm and rounded for reference 7 cautions to installation to install the oil lubricating bearing to the housing position the bearing so that the cut in the outer ring shall be perpendicular to the load
|
ntn spherical plain bearings ntn spherical plain bearings self-lubricating type series sar4 bearing numbers d d b dimensions mm inch c r1s min r2s min d1 ref 25.7 1.012 29.2 1.150 34.7 1.366 39.4 1.511 44.6 1.756 52.9 2.083 58.5 2.303 max angle of misalignment dynamic load rating cd n ibf 32 000 7 150 39 000 8 800 54 500 12 200 72 000 16 100 91 000 20 400 117 000 26 200 147 000 33 000 limiting thrust load pt n ibf 1 680 375 1 940 435 2 330 525 3 350 755 4 300 965 5 150 1 160 6 400 1 440 mass kg ib 0.085 0.187 0.120 0.265 0.222 0.489 0.270 0.595 0.370 0.816 0.570 1.26 0.820 1.81 sar4-22 sar4-25 sar4-30 sar4-35 sar4-40 sar4-45 sar4-50 22 0.8661 25 0.9843 30 1.1811 35 1.3780 40 1.5748 45 1.7717 50 1.9685 37 1.4567 42 1.6535 50 1.9685 55 2.1654 62 2.4409 72 2.8346 80 3.1496 19 0.7480 21 0.8268 27 1.0630 30 1.1811 33 1.2992 36 1.4173 42 1.6535 16 0.6299 18 0.7087 23 0.9055 26 1.0236 28 1.1024 31 1.2205 36 1.4173 0.3 0.012 0.3 0.012 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.3 0.01
|
ntn spherical plain bearings ntn spherical plain bearings lubrication type series sa1 sa1 ss 15mm sa1 d 140mm bearing numbers 1 dimensions mm inch ddbcr1s min r2s min d1 ref 13.1 0.561 15.3 0.602 18.7 0.736 21.2 0.835 23.7 0.933 29.3 1.154 34.2 1.346 39.8 1.567 45 1.772 50.8 2.000 56 2.205 66.8 2.630 77.9 3.067 89.4 3.520 sa1 sa1-10b 2 sa1-12b 2 sa1-15b sa1-17b sa1-20b sa1-25b sa1-30b sa1-35b sa1-40b sa1-45b sa1-50b sa1-60b sa1-70b sa1-80b sa1 ss 10 0.3937 12 0.4724 15 0.5906 19 0.7480 22 0.8661 26 1.0236 30 1.1811 35 1.3780 42 1.6535 47 1.8504 55 2.1654 62 2.4409 68 2.6772 75 2.9528 90 3.5433 105 4.1339 120 4.7244 9 0.3543 10 0.3937 12 0.4724 14 0.5512 16 0.6299 20 0.7874 22 0.8661 25 0.9843 28 1.1024 32 1.2598 35 1.3780 44 1.7323 49 1.9291 55 2.1654 6 0.2362 7 0.2756 9 0.3543 10 0.3937 12 0.4724 16 0.6299 18 0.7087 20 0.7874 22 0.8661 25 0.9843 28 1.1024 36 1.4173 40 1.5748 45 1.7717 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024 0.6 0.024
|
ntn spherical plain bearings ntn spherical plain bearings lubricating type series sa4 bearing 1 numbers d d b dimensions mm inch c r1s min r2s min d1 ref 23.6 0.929 25.7 1.012 29.2 1.150 34.7 1.366 39.4 1.552 44.6 1.756 52.9 2.083 58.5 2.303 64.7 2.547 72.7 2.862 76.2 3.000 81.5 3.209 max angle of misalignment dynamic load rating cd n ibf 39 000 8 800 50 000 11 300 63 500 14 300 99 000 22 300 126 000 28 400 152 000 34 500 195 000 43 500 254 000 57 000 315 000 70 500 395 000 89 500 435 000 97 500 490 000 110 000 static load rating cs n ibf 235 000 53 000 300 000 67 500 380 000 85 500 595 000 134 000 755 000 170 000 915 000 206 000 1 170 000 262 000 1 530 000 345 000 1 880 000 425 000 2 380 000 535 000 2 600 000 585 000 2 940 000 660 000 mass kg ib 0.050 0.110 0.085 0.187 0.116 0.256 0.225 0.496 0.300 0.661 0.373 0.822 0.600 1.32 0.870 1.92 1.25 2.76 1.70 3.75 2.05 4.52 2.22 4.89 sa4-20b sa4-22b sa4-25b sa4-30b sa4-35b sa4-40b sa4-45b sa4-50b sa4-55b sa4-60b sa4-65b sa4-70b 20 0.7874 22
|
ntn spherical plain bearings ntn spherical plain bearings lubrication type series sa2 inch size bearing 1 numbers d d b dimensions mm inch c r1s min r2s min d1 ref 0.862 21.9 1.000 25.4 1.114 28.3 1.417 36 1.547 39.3 1.622 41.2 2.000 50.8 2.228 56.6 2.559 65 2.886 73.3 3.118 79.2 3.421 86.9 max angle of misalignment dynamic load rating cd ibf n 8 650 38 500 11 800 52 500 15 100 67 500 23 900 106 000 28 600 127 000 33 500 149 000 47 000 209 000 60 500 269 000 77 500 345 000 96 500 430 000 115 000 515 000 138 000 615 000 static load rating cs ibf n 52 000 231 000 70 500 315 000 90 500 405 000 143 000 635 000 171 000 765 000 200 000 890 000 282 000 1 250 000 365 000 1 610 000 465 000 2 070 000 580 000 2 580 000 695 000 3 100 000 830 000 3 700 000 mass ib kg 0.123 0.056 0.190 0.086 0.273 0.124 0.511 0.232 0.763 0.346 0.926 0.420 1.42 0.643 2.05 0.931 2.89 1.31 4.06 1.84 5.34 2.42 6.81 3.09 sa2-12b sa2-14b sa2-16b sa2-20b sa2-22b sa2-24b sa2-28b sa2-32b sa2-36b sa2-40b sa2-44b sa2-48b 0.75
|
ntn spherical plain bearings ntn thrust spherical plain bearings lubrication type series sat bearing numbers ddhb dimensions mm inch c r1s min r2s min efgpa max angle dynamic of misaload lignment rating cd n ibf 6° 6° 5° 5° 5° 5° 4° 6° 5° 4° 74 000 16 600 127 000 28 600 167 000 37 500 254 000 57 000 365 000 82 500 475 000 107 000 640 000 144 000 720 000 162 000 790 000 178 000 1 020 000 229 000 static load rating cs n ibf 445 000 99 500 760 000 171 000 1 000 000 225 000 1 520 000 345 000 2 200 000 495 000 2 860 000 645 000 3 850 000 860 000 mass kg ib 0.260 0.573 0.375 0.827 0.640 1.41 1.02 2.25 1.64 3.62 2.50 5.51 3.38 7.45 sat20 sat25 sat30 sat35 sat40 sat45 sat50 sat60 sat70 sat80 20 55 20 14.3 13 0.6 1 0.7874 2.1654 0.7874 0.563 0.512 0.024 0.039 25 62 22.5 16 17 0.6 1 0.9843 2.4409 0.8858 0.630 0.669 0.024 0.039 30 75 26 18 19.5 0.6 1 1.1811 2.9528 1.0236 0.709 0.768 0.024 0.039 35 90 28 22 20 0.6 1 1.3780 3.5433 1.1024 0.866 0.787 0.024 0.039 40 105 32 27 22 0.6 1 1.5748 4.1339 1
|
