Operating Torque of Tapered Roller Bearings

Abstract

A theoretical derivation has yielded a general expression for the operating torque of a tapered roller bearing under pure thrust load. Experimental data have been obtained to enable determination of the constant and exponents to make this expression usable. Further theoretical analysis has extended the use of the thrust load equatiorz to pure radial and combined radial and thrust loads. Comparison of calculated and measured operating torques under radial load has ver$ed the theoretical derivation.The bearing geometry variables from the basic torque equation have been combined into a G factor which represents the heat generation potential of a bearing. NOMENCLATURE a, b = exponents Di = mean cone race diameter, in Do = mean cup race diameter, in D, = pitch diameter = $ (Di + Do), in D = mean roller diameter, in ei, e, = offset of centroid of pressure distribution from geometric center of contact (see Fig. 8), in E' = combined modulus of elasticity, Ib/in2 F, = bearing thrust load, Ib F, = bearing radial load, Ib f~ = equivalent thrust load factor G = bearing geometry factor h = cone rib-roller end contact height, inJ , = SjZivall's radial integral k, k', k" = constants K = bearing K factor = ratio of basic dynamic radial load rating to basic dynamic thrust load rating 1 = roller-race contact length, in m = torque per roller Ib-in M = total bearing torque, Ib-in A typical bearing application illustrates use of ihe equations.

A Study on a Stepped Traction Drive Transmission

“…It is seen that high efficiency was obtained from the low torque region, with maximum efficiency reaching 98%. The measured values show good agreement with the calculated efficiency obtained by applying a viscoelastic-plastic traction model (5) and a method of calculating the friction torque on a rolling bearing (6) .…”

Lubrication of High-Speed, Large Bore Tapered-Roller Bearings

“…bearing K factor =-ratio of basic dynamic radial load rating to basic dynamic thrust load rating equivalent thrust load factor given a s a fuction of ratio of thrust-to-radial load in [ 9) Operating torque for the test bearing used in this program was calculated using this equation and converted to power loss for comparison with the heat transfer data. This comparison is shown in Table 2.…”

Theoretical and experimental investigation on the thermal characteristics of double-row tapered roller bearings of high speed locomotive

“…11.057 0017-9310/Ó 2014 Elsevier Ltd. All rights reserved. torque for tapered roller bearings also have been proposed by many researchers [4][5][6]. However, there are some application restricts for application of these formulae in a wide range of bearing operating conditions due to their different limitations [7].…”