1 hub bearing types and configurations hub bearings are classified as ball type or roller type the ball type includes gen 1 gen 2 and gen 3 and the roller type gen 1 and gen 2 the bearings are further classified according to application as bearings for driven wheel and non driven wheel hub bearing ball type gen 1 for driven wheel for non driven wheel gen 2 for driven wheel for non driven wheel inner ring rotating type outer ring outer ring with flange ball inner ring inner ring ball cage seal cage seal for non driven wheel outer ring rotating type hub/outer ring unit fixed rotating hub bolt inner ring cage ball seal 020
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2 bearing number gen 1 ball type gen 1 roller type gen 2 ball type gen 2 roller type gen 3 ball type driven wheel gen 3 ball type non driven wheel 040
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3 hub bearing selection 3.1 selection overview hub bearings are very important part in terms of vehicle safety selecting the type of bearing most suited to the vehicle ensures safety and is very important for exhibiting the required performance to select the best bearing one must consider and evaluate the bearings from a variety of angles the procedure for selecting hub bearings is provided in the form of a flowchart hub bearing selection flowchart order check study and evaluation items ¡vehicle model ¡front/rear ¡vehicle specifications ¡custom specifications ¡configuration of area surrounding bearing ¡driven non driven wheel ¡traveling conditions ¡evaluation test items determination standards ¡allowable space for bearing ¡rigidity ¡whether or not equipped with abs sensor ¡cost ¡inner/outer ring rotation ¡whether or not equipped with seal ¡ease of assembly serviceability usage conditions check bearing type selection bearing type study ¡life calculation ¡shoulder protrusion ball type
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3 hub bearing selection 3.3 life calculation life of hub bearings is calculated by inputting reaction force radial load and axial load on the wheel given as set traveling conditions as load each bearing is a unit bearing consisting of two rows of bearings life of the bearings is calculated separately for the each of the bearings bearing life is calculated for the outer and inner bearings the shorter of the calculated values is considered the calculated life of hub bearings 1 vehicle specifications front/rear wheel axle static load front/rear wheel tread height of gravitational center effective radius of tires w t h rs h wheel offset s vehicle outside positive relative to gravitational center of bearing t +s w rs t 2 calculation of road reaction force first we calculate road reaction force applied to the wheel by the road road reaction force in the axial and radial directions is calculated by the following formula wr f w w wt g wr wr wt fw g 2 gwht road reaction force in the radial di
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3 l hub bearing selection 2 general travel distance life if you take several travel conditions into consideration you can determine general travel distance life by the following formula integrating the respective calculated lives qilil general life 106 rotations frequency of each traveling condition qili calculated life of each traveling condition 106 rotations lk 2 rs l 106 lk general travel distance life km rs effective tire radius an example of life calculation results is provided in fig 1 for your reference 100 general travel distance life x 104 km outer bearing inner bearing 10 1 0.10 0.05 0 clearance mm 2 3 4 5 6 preload kn 7 8 9 10 3.4 allowable stress and shoulder protrusion 1 allowable stress when a load is placed on a bearing contact stress at the center of the rolling elements and raceway where the maximum stress is received should be no greater than the following values ball type 4,200 mpa roller type 4,000 mpa fig 1 example of life calculation results rolling element
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4 bearing materials 5 lubrication 4 hub bearing materials 4.1 raceway and rolling element materials innovations in steel manufacturing technologies such as vacuum gas removal out-of-furnace smelting and continuous casting have notably reduced harmful non-metallic inclusion thus realizing longer bearing life ntn selects quality materials that best suit each type of bearing 1 nkj65m based on carbon steel nkj65m was developed as a substitute for suj2 nkj65m is high quality clean carbon steel that offers lower cost and better rolling fatigue life nkj65m is used for the inner and outer rings of the gen 1 and inner rings of the gen 2 and gen 3 ball types 2 suj2 equivalent of sae52100 the most commonly used material suj2 is a quality material having minimal non-metallic inclusion suj2 is used for balls the inner and outer rings of the gen 1 and balls and inner rings of the gen 2 and gen 3 ball types 3 s53c equivalent of sae1053 raceways are made of induction hardened s53c a highly forgeable c
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8 hub bearing for active abs sensor 8 hub bearing for active abs sensor 8.1 magnetic encoder for active sensor in the past electromagnetic sensors and magnetic tone wheels passive type have been used to detect wheel rotational speed for antilock brake systems abs in recent years however makers have begun to use sensors equipped with a semiconductor element that can detect extremely low speed ranges active type some active type semiconductor sensors are equipped with a built-in bias magnet and some are not the former uses a conventional tone wheel and the latter requires a multipolar magnetized encoder 1 types there are two types of magnetized encoder axial and radial type according to sensing direction see fig 9 2 features conventional sintered tone wheels are designed with a large diameter magnetic encoders enable smaller outer diameter and more compact size fig 10 shows an example of more compact construction radial type axial type magnetic encoder fig 9 configuration of radial an
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9 hub bearing dimensions b ry rx b1 d d r gen 1 ball type for driven/non driven wheel type without seal main dimensions mm d 25 27 30 32 distance between pressure cone apexes r mm type with integrated seal basic rated load kn type with single row integrated c c0 12.7 16.5 9.85 12.9 23.7 19.9 18.5 18.5 21.6 20.9 17 18.5 18.6 25 19.5 25 23.9 28.3 21.8 25 24.9 24.9 20.8 25.1 26.1 26.8 27.9 20.2 23.9 25.1 29.3 26.4 26.4 28.9 30.5 27.2 27.2 28.7 28.8 30 32.5 25.9 22.4 27.9 34 32.5 32.5 37 50.5 Å seal mass kg reference bearing no au0501-4l/l260 de0565lzcs34px1/l244 de0678cs12/5a de0681cs18px1/l260 de0690lzcs12px1/l244 au0603-2llx/l260 de0776cs46/5a au0701-4ll/l588 de0745llcs32px1/5a de0787llcs54/5a au0706-3lxl/l260 au0704-1ll/l260 2b-de07a34cs30/l260 de0763cs46px1/5a tm-de08a74cs10px1/l260 de0769cs46px1/5a 2b-de07a37cs22/l260 de07a02llcs46/l109 7b-de08a32llx3cs30/l260 de0869cs46px2/5a au0810-1lxl/l260 au0811-6lxl/588 2b-de08a33cs38px1/l260 au0814-1llx/l260 au0818-1lxl/l260 de0892llcs43/l244
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9 hub bearing dimensions b t bi ry rx b1 d1 r pt d d distance between pressure cone apexes r mm gen 2 ball type inner ring rotating type for driven wheel main dimensions mm d 28 29 34 bearing no hub003-1 hub204-5 hub009-2 hub212-5 hub166-4 hub147-28 hub223-6 hub147-32 hub111 hub175-14 hub089-11 hub189-2 hub081-45 hub100-7 hub030-20 hub132-2 hub098-14 basic rated load kn number of tapped single row c 23.4 26.6 23.4 27.2 32.5 32.5 32.5 32.5 32.0 36.5 36.5 36.5 36.5 36.5 36.5 41.0 43.5 d 62 65 62 69 75 75 75 80.6 84 84 84 80.6 83 83 84 86 90 b 40.5 37 40.5 37 62.8 62.8 62.8 65.3 49.5 56 39.5 66 42.5 47.5 56 47.5 49 b1 42.5 37 42.5 37 46.8 46.8 46.8 46.8 43 56 41 46.5 44 49 56 49 49 d1 43 42.9 43 48.4 52.5 52.5 52.5 52.5 55.4 59.3 59.4 59.4 59.4 59.4 58.6 62 65.1 t 8 10 8 10 13.3 14.1 14.1 14.1 10 12 13 14.1 14 14 15 14 14 bi 21 20 21 20.4 14.4 8.5 9.6 11 10 13 15 11 16.5 21.5 11 21.5 19 pt 86.1 91.214 86.1 93 120 120 120 106 120 102 102 110.009 105 151.38 rx 3.5 3 3.5 3.5 3.5 3.5 3.5 3.5
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9 hub bearing dimensions gen 2 ball type inner ring rotating type for non driven wheel b ry rx b1 d2 d1 r dr d d distance between pressure cone apexes r mm pn main dimensions mm d 30 d 65 b 51.8 b1 42 dr 76 d1 46.2 d2 63 ph 99 bearing no hub121-4 basic rated load kn number of single row outer ring c 29.5 c0 20.4 holes rx 3.7 ry 3.6 mass kg reference 53.0 4 1.00 gen 2 roller type inner ring rotating type for non driven wheell b b0 rx ry b1 rddt df pt d1 main dimensions mm d 65 70 d 143.1 141.5 b 130 110 b1 130 110 d1 103.5 100 t 24 25 b0 128 110 pt 165 165 df 194 194 rx 12 12 ry 11 7 distance between pressure cone apexes r mm bearing no hur042-27 hur040-11 basic rated load kn number of tapped single row c 21.9 19.3 c0 31 27.9 10 10 mass kg holes in outer ring reference 107 84.2 13.9 11.3 200
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gen 3 ball type inner ring rotating type for driven wheel bi t bt bf dw dc db pb df d r d pt distance between pressure cone apexes r mm main dimensions mm d 24.4 26.4 27.52 28.4 d 84 90 87 85.5 84 b 94.3 84.2 74.5 bf 65.5 60.4 38.5 dc 50 57 57 dw 56 67 67 db 58 69 69 t 10 10 11.5 bi 14 16 15.5 pb pt df 124 138 139 139 bearing no hub266-1 hub267-1 hub251-4 hub211-7 basic rated load kn number number mass of tapped single row of hub kg c 27.6 27.7 43.5 44 c0 22.3 24.9 34.5 33.5 33.5 bolts holes in outer ring reference 100 107 114.3 110 114.3 112 75.3 69.9 74.6 67.2 80.8 5 5 5 5 5 4 4 4 3 4 3.65 3.64 3.2 2.8 3.41 79.83 35.9 95.5 69 56.9 63.23 70.97 11 58 66 68 10.5 17.83 107.95 112 15.5 114.3 107.004 148 hub012t-1 40.5 old bearing number given in blue gen 3 ball type inner ring rotating type for non driven wheell bi t bt ba dw db pb d r df pt main dimensions mm dw 64 66 67 d 74 76 84 84 90 db 64 64 68 68 69 ba 58.8 53 69 40.7 60.4 t 8 10 10.5 10 10 bi 12.5 12 15.5 17.7 16 pb 114.3 114.3 11
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