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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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Wear in high speed applications could be catastrophic where the magnitude of dynamic loading that can occur from nonconjugate gear tooth action is excessive. Overload factors can only be established after considerable field experience is gained in a particular application.

You must enter two application factors 2101-d40 represent load spectra accurately. Calculated gear ratings are intended to be conservative, but the scatter in actual results may exceed 20 percent.

Where does the future lie? S ut is the material ultimate tensile strength at a normalized reliability level, MPa. The formulas of this standard are not applicable when any of the following conditions exist: Log in to leave a comment.

The rim thickness factor, KB, adjusts the calculated bending stress number for thin rimmed gears. The allowable stresses are only valid for materials and conditions listed in this standard see clause 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.

These calculation methods are based on the AGMA or basic standards. At the time of development, the editions were valid. Assembly variations of installed gears — Alignment of the axes of rotation of the pitch cylinders of the pinion and gear as influenced by housing accuracy and concentricity of the bearings. When using a service factor, the determination of ZN and YN shall be in accordance with clause Intermediate values are not classified since the effect of deviations from the quality standards cannot be evaluated easily.

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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. It was approved as an American National Standard on December 28, Allowable stress numbers for steel gears are established by specific quality control requirements for each material type and grade.

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

This method will give results similar to those obtained in previous AGMA standards. Changing the profile shift, lowering the operating pressure angle, or using a larger module will increase he max. The lead correction factor, KHmc, modifies peak load intensity when crowning or lead modification is applied.

A guide for minimum case depth for nitrided external not internal teeth based on the depth of maximum shear from contact loading is given by the formula: It is not intended for use by the engineering public agm large.

Wear in low speed applications may be tolerable. This effect is addressed by the pinion proportion modifying factor, KHpm. Quantity must be a positive whole number.

The symbols and terms contained in this document may vary from those used in other AGMA standards. The rim thickness factor, KB, is not sufficiently conservative for components with hoop stresses, notches or keyways.

A major problem occurs in the calculation of the deflections.

Those presented are used to show many of the considerations which may vary on each application. For one-way bending, the force would only be applied using one of the vectors.

Calculation methods

The value of CH for the gear is either 1. S a is any value of alternating stress at a normalized reliability level, MPa. 211-d04 grade cleanliness requirements apply only to those portions of the gear material where the teeth will be located, to a distance below the finished tip diameter of at least two times the tooth depth.

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Care should be exercised when choosing case depth, such that adequate case depths prevail at the tooth root fillet, and that aagma tips are not over hardened and brittle.

The use 2110-d04 American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. Undercut exists in an area above the theoretical start of active profile.

The knee was established based on experience of manufacturers who have successfully operated gears at rated loads with this backup ratio. On external gears this portion of the gear blank normally will be less than 25 percent of the radius.

Indications smaller than 0. All publications are subject to revision, and the users of this standard are encouraged to investigate the possibility of applying the most recent editions of the publications listed. Unless the appropriate gear quality level is used to calculate the power rating of a afma system and that quality level 2101-r04, in fact, duplicated or exceeded in manufacturing, the unit produced may not have the desired life.

This iterative type of solution is well suited to computer analysis. Other special stock allowances such as those used to minimize distortion during heat treatment must be considered. Normalized and tempered gearing may require a higher hardenability if the design does not permit liquid quenching.