Timken - Thrust Bearings

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ENGINEERING Bearing reactions BEARING REACTIONS DYNAMIC EQUIVALENT THRUST LOAD (P a ) To calculate the fatigue life of a thrust bearing, it is necessary to calculate a dynamic equivalent thrust load, designated as P a. The dynamic equivalent thrust load is defined as the single thrust load that, if applied to the bearing, will result in the same life as the combined radial and thrust loading under which the bearing operates. For thrust ball, thrust spherical and thrust tapered roller bearings, the existence of radial loads introduces complex load calculations that must be carefully considered. If the radial load (F r) is zero, the dynamic equivalent thrust load will be equal to the applied thrust load (F a). THRUST BALL, CYLINDRICAL AND TAPERED ROLLER BEARINGS Thrust cylindrical roller bearings, as well as most thrust ball and thrust tapered roller bearings, are designed to carry thrust load only. The dynamic equivalent thrust load is equal to the applied thrust load (F a) for these pure thrust applications. For thrust ball and thrust tapered roller bearing applications where radial load is applied, load calculations become much more complex. Please consult your Timken engineer for a review of bearing selection and application. Angular contact thrust BALL BEARINGS For angular contact thrust ball bearings, the dynamic equivalent thrust load is determined by: P a = X F r + Y F a For standard TVL and DTVL bearings having a 50° contact angle, X = 0.76 and Y = 1.00. Minimim F a/F r ratio to maintain proper operation for these applications is 1.56. THRUST SPHERICAL ROLLER BEARINGS Thrust spherical roller bearing dynamic loads are determined by: P a = 1.2F r + F a Radial load (F r) of a thrust spherical roller bearing is proportional to the applied axial load (F a) such that F r≤ 0.55 F a. The steep roller angle induces a thrust load (F ai = 1.2F r) when a radial load is applied. This thrust load must be resisted by another thrust bearing on the shaft or by an axial load greater than F ai. STATIC AXIAL EQUIVALENT LOADS To compare the load on a non-rotating bearing with the basic static capacity, it is necessary to determine the static equivalent load. In the case of thrust bearings, the static equivalent thrust load is used. The static axial equivalent load is defined as the pure thrust load that produces the same contact pressure in the center of the most heavily stressed rolling element as the actual combined load. The static axial equivalent load is dependent on the bearing type selected. For bearings such as thrust cylindrical roller bearings and most thrust tapered roller bearings that are designed to accommodate thrust loading only, the static axial equivalent load is equal to the applied load. For thrust tapered roller bearings where a radial load or moment is applied, please consult your Timken engineer. THRUST BALL, CYLINDRICAL AND TAPERED ROLLER BEARINGS Thrust cylindrical roller bearings, as well as most thrust ball and thrust tapered roller bearings, are designed to carry thrust load only. The static axial equivalent load is equal to the applied thrust load for these pure thrust applications. For thrust ball and thrust tapered roller bearing applications where radial load is applied, load calculations become much more complex. Please consult your Timken engineer for these applications. Angular contact THRUST BALL BEARINGS Angular contact thrust ball bearings use the same equation for equivalent static and dynamic loading. P oa = X o F r + Y o F a For standard TVL and DVL bearings having a 50° contact angle, X = 0.76 and Y = 1.00. THRUST SPHERICAL ROLLER BEARINGS The following equation is used for thrust spherical roller bearings: P oa = F a + 2.7 F r Thrust spherical roller bearings require a minimum thrust load for proper operation. P oa should not be greater than 0.5 C oa. If conditions exceed this, consult your Timken engineer. 20 TIMKEN ® THRUST Bearing Catalog
ENGINEERING bearing reactions MINIMUM BEARING LOAD THRUST SPHERICAL ROLLER BEARINGS Centrifugal force in thrust spherical roller bearings tends to propel the rollers outward. The bearing geometry converts this force to induced thrust component, which must be overcome by an axial load. This induced thrust (F ac) is given by: F ac = k n 2 x 10 -5 (lbf per RPM) The minimum required working thrust load on a thrust spherical roller bearing (F a min) is then computed by: F a min = 1.2 F r + F ac >= C 0a/1000 (lbf) In addition to meeting the above calculated value, the minimum required working thrust load (F a min) should be equal to or greater than 0.1 percent of the static thrust load rating (C 0a). TIMKEN ® THRUST bearing catalog 21
Page 1: cylindrical roller bearing catalog
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Page 8 and 9: TIMKEN Products and Services ••
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Timken - Thrust Bearings

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