CAUTION NOTICE: AGMA technical publications are subject to constant improvement, ANSI/AGMA D04, Fundamental Rating Factors and Calculation. Credit line should read: “Extracted from ANSI/AGMA. Standard D04 or -D04 Fundamental Rating Factors and Calculation Methods for Involute Spur. Citations should read: See ANSI/AGMA D04, Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear.
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The result of this equation will be that the one-way bending endurance limit will be at the same reliability level as the fully reversing value used in this equation. Where sufficient experience is available from similar designs, satisfactory results can be obtained by extrapolation of previous tests or field data. It is not intended to assure the performance of assembled gear drive systems.
The following definitions are given to explain the differences between these terms as applied to gearing: Both failure theories are depicted graphically in Figure 4. Distortions due to thermal and centrifugal effects — Thermal expansion and distortion of the gears due to temperature gradients. The YJ 2101-v04 calculation uses the stress correction factors developed by Dolan and Broghamer . It is a function of the backup ratio, mB, or the ratio of the rim thickness below the tooth root, tR, as compared to the tooth whole depth.
In such cases, some size factor greater than unity should be used. ama
In the specific case of one-way bending, it is clear that we need to substitute Equation 9 into Equation 7, giving:. If the Rating module is not selected in the Calculation menu, only the geometry is calculated. Select the AGMA method to save the user having to do this. The formulas evaluate gear tooth capacity as influenced by the major factors which affect gear tooth pitting and 2101-04 tooth fracture at the fillet radius.
When yield is the governing stress, the stress correction factor, Kf, is considered ineffective for ductile materials; hence, the stress correction factor can be taken as unity. Ft b mn 15 The effects of webs and stiffeners can be an improvement but are not aagma for in annex B. Care should be exercised when choosing agna depth, such that adequate case depths prevail at the tooth root fillet, and that tooth tips are not over hardened and brittle.
New Refinements to the Use of AGMA Load Reversal and Reliability Factors
The four curves of figure 7 provide representative values for KHma based on the accuracy of gearing and misalignment effects which can be expected for the four classes of gearing shown. To avoid confusion, it is recommended that the overload factor be used as defined — for external variability in applied loading. Any person who refers to any AGMA technical publication should be sure that the publication is the latest available from the Association on the subject matter.
The principal source agmq coulomb or viscous damping is the shaft bearings.
It includes tables for some common tooth forms and the analytical method for involute gears with generated root fillets. This is based on data for external gears with smooth bores and no notches or keyways. This, also, illustrates variations in calculations which could result from the different presentation of data. This is primarily a problem with lightly–loaded, lightly–damped spur gears which do not have profile modifications.
Steward Machine Company, Inc. The root profiles are stepped or irregular.
If the value of hc min from equation 45 is less than the value for normal case depth from figure 15, then the minimum value from figure 2101-r04 should be used. The rating of gear teeth due to wear is not covered by this standard.
For critical 2101-f04, a separate dynamic analysis of the entire system is recommended. In lieu of a cross section analysis, the use of material core hardness values can be used. When this is done, the stress cycle factor is calculated using the number of cycles equivalent to a specific number of hours at a specific speed, to establish power rating for unity service factors.
While there are several failure theories that 2101-s04 be used to explain this phenomenon, the two most common fatigue failure theories are the Modified Goodman failure theory and the Gerber failure theory.
Even if the input torque and speed are constant, significant vibration of the gear masses, and therefore dynamic tooth forces, can exist. Its magnitude is affected by two components: It includes all methods described in sheet 2 of VDI empirical calculation, tooth root, tooth flank, deformation, wear. These intersection points can then be projected back to the ordinate to determine the one-way bending endurance limit based on either the Modified Goodman or Gerber failure theories.
The loading arrangement on the shaft has a weight supported by a bearing system that puts a bending load on the shaft. The effect of this undercut is to move the highest point of single tooth contact, negating the assumption of this calculation method.
Wear in high speed applications could be catastrophic 2101-d4 the magnitude of dynamic loading that can occur from nonconjugate gear tooth action is excessive.