CAUTION NOTICE: AGMA technical publications are subject to constant improvement, ANSI/AGMA D04, Fundamental Rating Factors and Calculation. Credit line should read: â€œExtracted 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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### Calculation methods

This is equivalent to a 1-percent failure rate, a percent reliability, or 10, parts per million PPM defective level. As the extent of these factors become known with more certainty, the value of the factor of safety can be more accurately determined.

Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute.

A detailed discussion of factors influencing gear survival and calculation methods are provided. Initial pitting is characterized by small pits which do 22101-d04 extend over the entire face width or profile height of the affected teeth. However, this intersection falls outside of our area of interest, so we can ignore the effect of this modification to the Goodman failure theory.

See table in This means that the resulting load reversal factor is itself independent of the reliability level. Material on scuffing scoring resistance was added as an annex.

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. Initial pitting occurs in localized, overstressed 2101-f04. Slow speed gears, with pitch line velocities greater than 0.

The effect of tapered rims has not been investigated. This may be due to high temperatures, inadequate additive package in the oil, size of the pinion, inadequate oil viscosity, or tooth finish characteristics. The material property data in Table 3 was taken from Jandeska et al.

Sometimes the gearing is reground after initial pattern checks to correct for the assembly variations. Equations 1 through 4 all provide identical results for a given statistical probability. This information is for reference only — do not extract any data from the figures without first consulting the appropriate reference literature from which it was taken.

Therefore, only an experienced engineer should apply knowledge of S–N curves to gear calculations. For example, a product such as an automobile transmission which is subjected to full size, full load prototype testing and rigorous quality control of dimensions, materials and processes during manufacture, could have a more precise safety factor than a hoist made in small quantities to normal commercial practices. Removal of defects which exceed the stated limits is acceptable provided the integrity of the gear is not compromised.

Therefore, conservative selection of all gear capacity calculation influence factors is recommended unless operating experience of an identical design is known. It can be obtained from publications or by tests of bar material on R. These calculation methods are based on the AGMA or 211-d04 standards. AGMA application standards may use other empirical factors that are more closely suited to the particular field of application.

## New Refinements to the Use of AGMA Load Reversal and Reliability Factors

For example, materials such as aluminum or stainless steel may encounter lubrication problems that invalidate calculations of pitting resistance and bending strength.

Castings are permissible with primarily round Type 1 sulfide inclusions 0. VDI contains all the modifications recommended according to Tables The formulas presented in this standard contain factors whose values vary significantly depending on application, system effects, gear accuracy, manufacturing practice, and definition of gear failure.

The ratings of both pinion and gear teeth must be calculated to evaluate differences in material properties and the number of tooth contact cycles under load.

However, the reduction in tooth root thickness due to protuberance below the active profile ahma handled correctly by this method.

For additional information, see [20]. Empirical factors given in this standard are general in nature. The pinion proportion factor can be obtained from figure 5. Additional higher allowable stress numbers for carburized gears were added when made with high quality steel. The equations presented are more accurate than any other 2101-04 equations found by the author in other literature.