AGMA B89 (Revision of AGMA ). April AMERICAN GEAR MANUFACTURERS ASSOCIATION ~~. Geometry Factors for Determining the Pitting. AGMA B89 (R) Information Sheet – Geometry Factors for Determining the Pitting Resistance and Bending Strength of Spur, Helical and Herringbone. diseño de engranajes (AGMA) Este diseño se realizo mediante la norma AGMA la actual normativa de diseño de engranajes.

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This Appendix presents the derivation of the pitting resistance formula and the I factor as used in this Information Sheet. Full Buttressing Exists When F, 2 One Addendum The J factor uses the m inimum radius of curvature which occurs at the point where the fillet curve is tangent to the root circle, where Q!

The radius of curvature of the fillet curve, Pb, at any point defined by CY n is given by: They are developed by multiplying Eq B. When designing non-power gearing, it is not necessary to solve and check any strength agma b A mathematical procedure is described to determine the Geometry Factor, I, for internal and external agma b89 sets of spur, conventional helical and low axial contact ratio, LACR, helical designs.

### Item Detail – AGMA B89 (reaffirmed March )

Usual values are in the range 0. Kemp KymmeneStromberg Santasalo J. Bending Strength Geometry Factor, J 5. This means that e g must always be higher than 1. See Section 7 and Fig 7 A helical factor must be added to account for the oblique lines of contact in helical gears, see 5. Hager Cummins Engine A. The results are idgntical to AGMA The table is based on a circular tooth thickness of: This has a m inor effect on the accuracy of the J factor.

Starting with the general Hertz equation: The resulting conx servative value should be used unless otherwise justified. Derivation of the stress equation. Hehcal disk shaper cutters cannot be measured as described above, so they must be described from AGMA 70 the cutter design data.

Suggestions for the improvement of this Standard will be welcome. Agma b89 Stress in Internal Gears. Values in excess of those shown in Table require the use of tip loading.

For this reason, it is recommended that the J factor be calculated for both the LACR condition and as a conventional helical gear, using a value for F which is slightly greater than p. Because the bending stressesin internal gears are influenced by so many variables, no simplified model for calculating the bending stress in internal gears can be offered at this time. The tables do not include geometry factors when an undercutting condition exists in either of the two gears.

The load sharing ratio, ntN, and the pitting 908-b889 geometry factor, I, are these terms. For normal helical gears and spur gears, this factor is 1.

908-b9 Studies have been done on the subject of high transverse contact ratio, HTCR gears. The nominal tool addendum is hcLo. Several tables of precalculated Geometry Factors, I and J, are provided for wgma combinations of agma b89 and tooth forms. Spur gears develop the most critical stress when load is applied at the highest point of the tooth where a single pair of teeth is carrying all of the 980-b89.

Pitting Resistance Geometry Factor, I A mathematical procedure is described to determine the Geometry Factor, Ifor internal and external gear sets agms spur, conventional helical and low axial contact ratio, LACR, helical designs.

Cutters which act in the transverse plane, such as helical disc shaper cutters and some rack shaper cutters will generate root trochoid forms which are slightly different from those assumed by this method. The simplified information given here is intended to provide typical values which may be used as afma guide to usual practice.

When exact cutter dimensions are not known, refer to Appendix D. The formulas of this Information Sheet are not valid when any of the following conditions exist: Partridge Lufkin Industries A.

## AGMA 908-B89 EPUB

Any person who refers to any AGMA Technical Publication should determine that it is the latest information available from the Association on the subject.

The angular displacement of tool, eno, is: Due to the number of requests for this paper, it was decided to publish the data in the form of an Information Sheet which became AGMA It is hoped that sufficient geometry factor data is included to be agma b89 help to the majority of gear designers.

It is based on the work of Wellauer and Seireg [7]. The effect of this undercut is to agma b89 the highest point of single tooth contact, negating the assumption of this calculation method. The tables do not include geometry factors 908-bb89 either the pinion or gear tooth top land is less than the value expressed in Eq 7. Rack Shaped Cutters and Hobs.

## AGMA 908 B89 EBOOK

Over 24 teeth, assume a 0. The stress equation now can be written as: If the radio button on the line [ Therefore, the number of teeth is chosen and specified agma b89 to qualitative and strength indices. The tolerance calculation is linked agma b89 the main calculation and the tolerances are calculated for a current accuracy, module, diameters and the agma b89 agka the wheels.

Number to 20 16 12 10 8 6 4 3 Table D-l of Cutter Teeth Default Values 40 32 32 30 24 18 16 15 Disk shaped cutters are not as standardized as hobs or other rack shaped cutters. Definitions and Symbols 2. This term converts the values of u and t to actual values and was added to account for layouts or calculations that are done to a scale other than one NDP.