The Design of Rolling Bearing Mountings
The Design of Rolling Bearing Mountings The Design of Rolling Bearing Mountings
In addition to this radial load F rJ , bearing location Jaccommodates the thrust load component of the pistonload:F aJ = F Ka = 9.97 kNThus, the equivalent dynamic load with F a /F r =9.97/5.59 > e = 1.14 and X = 0.35 and Y = 0.57.P = 0.35 · F rJ + 0.57 · F aJ == 0.35 · 5.59 + 0.57 · 9.97 = 7.64 kNWith the dynamic load rating C = 72 kN and the speedfactor f n = 0.265 (n = 1,800 min –1 ) the index of dynamicstressingf L = C/P · f n = 72/7.64 · 0.265 = 2.5Here the load rating C of the bearing pair is taken asdouble the load rating of a single bearing.Bearing location HF Hx = F Ka · e/l = 9.97 · 19.3/90 = 2.14 kNF Hy = F Kt · t/l = 4.65 · 10/90 = 0.52 kNF rH = √ F Hx2 + F Hy2 = √ 4.58 + 0.27 = 2.2 kNThe equivalent dynamic load for the deep groove ballbearing equals the radial load:P = F rH = 2.2 kNWith the dynamic load rating C = 29 kN and the speedfactor f n = 0.265 (n = 1,800 min –1 ) the index of dynamicstressingf L = C/P · f n = 29/2.2 · 0.265 = 3.49The index f L for axial piston machines selected isbetween 1 and 2.5; thus the bearing mounting is adequatelydimensioned. Loads occurring with gearwheeldrive or V-belt drive are not taken into account in thisexample.Machining tolerancesSeat Deep groove Angular contactball bearing ball bearingShaft j5 k5Housing H6 J6116: Drive flange of an axial piston machine167 FAG
117 Axial piston machineOperating dataRated pressure p = 150 bar; maximum speedn max = 3,000 min –1 , operating speed n nom =1,500 min –1 ; piston diameter d K = 25 mm, pistonpitch circle = 73.5 mm; angle of inclination = 25°;number of pistons z = 7; distance between load lineand rotational axis e = 24 mm.To minimize shaft tilting due to the radial clearance ofthe deep groove ball bearing, Belleville spring washerskeep the bearing under light axial preload, thus ensuringzero clearance. A comparison of the f L values determinedfor the two pumps shows that the pump describedin example 117 is designed for only a shortoperating life (rating fatigue life 850 h). This life spanis, however, sufficient for many applications (e.g.dump trucks).Bearing selection, dimensioningThe bearing loads are determined as in example 116.Bearing location H: Deep groove ball bearingFAG 6311Index of dynamic stressing f L = 2.98Bearing location J: Angular contact ball bearingFAG 7311.TVPIndex of dynamic stressing f L = 1.19In examples 116 and 117 the axial load is accommodatedby angular contact ball bearings mounted nearthe drive flange end. Counter guidance is provided by adeep groove ball bearing.Lubrication, sealingThe bearings are lubricated by leakage oil from thepump. A shaft seal is satisfactory.Machining tolerancesSeat Deep groove Angular contactball bearing ball bearingShaft h6 j5Housing J6 J6117: Drive flange of an axial piston machineFAG 168
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- Page 179 and 180: GlossaryAdditivesAdditives are oil-
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117 Axial piston machineOperating dataRated pressure p = 150 bar; maximum speedn max = 3,000 min –1 , operating speed n nom =1,500 min –1 ; piston diameter d K = 25 mm, pistonpitch circle = 73.5 mm; angle <strong>of</strong> inclination = 25°;number <strong>of</strong> pistons z = 7; distance between load lineand rotational axis e = 24 mm.To minimize shaft tilting due to the radial clearance <strong>of</strong>the deep groove ball bearing, Belleville spring washerskeep the bearing under light axial preload, thus ensuringzero clearance. A comparison <strong>of</strong> the f L values determinedfor the two pumps shows that the pump describedin example 117 is designed for only a shortoperating life (rating fatigue life 850 h). This life spanis, however, sufficient for many applications (e.g.dump trucks).<strong>Bearing</strong> selection, dimensioning<strong>The</strong> bearing loads are determined as in example 116.<strong>Bearing</strong> location H: Deep groove ball bearingFAG 6311Index <strong>of</strong> dynamic stressing f L = 2.98<strong>Bearing</strong> location J: Angular contact ball bearingFAG 7311.TVPIndex <strong>of</strong> dynamic stressing f L = 1.19In examples 116 and 117 the axial load is accommodatedby angular contact ball bearings mounted nearthe drive flange end. Counter guidance is provided by adeep groove ball bearing.Lubrication, sealing<strong>The</strong> bearings are lubricated by leakage oil from thepump. A shaft seal is satisfactory.Machining tolerancesSeat Deep groove Angular contactball bearing ball bearingShaft h6 j5Housing J6 J6117: Drive flange <strong>of</strong> an axial piston machineFAG 168
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