AGMA 908-B89 PDF

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 AGMA agma b89 sheet and related publications are based on typical or average data, conditions, or application. Since the boundary conditions strongly influence the ring-bending stresses, the method by which the internal gear is constrained must be considered.

The effect of this undercut is to move the highest point of single tooth contact, negating the assumption of this calculation method. The Lewis method models the gear tooth as a cantilever beam and is most accurate when applied to slender beams external gear teeth with low pressure anglesand inaccurate for short, stubby beams internal gear teeth which are wide at their base.

Full buttressing exists when the face of the tooth extends at least one 2. These values are then used in conjunction with the rating procedures described in AGMA B88, Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth, for 9088-b89 various spur and helical gear designs produced using 90-8b89 generating process. To make actual measurements dimensionless, they are converted to ratios by multiplying them by diametral pitch, dividing them by module, or comparing them to a v 3.

Pitting Resistance Geometry Factor, I A mathematical procedure 9088-b89 described to determine the Geometry Factor, Ifor internal and external gear sets of spur, conventional helical and low axial contact ratio, LACR, helical designs. These values are then used in conjunction with the rating procedures described in AGMA B88, Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth, for evaluating various spur and helical gear designs produced using a generating process.


The load applied to the cylinder is the load normal to the tooth flank, and the length of contact is the m inimum total length of lines of contact in the contact zone of the gear set. The lengths, C 1 through C 6, are derived from Fig 3-l.


The following variables must be made dimensionless by dividing with the normal module, mn, or multiplying with the normal diametral pitch, P nd, 908-b8 AGMA The J factor calculation procedure must be repeated for both the pinion and the gear using the appropriate dimensions for each. Also, the ag,a history of the bending stress at a particular point on the internal gear is important because the stresses alternate from tension to compression.

The AGMA pitting resistance formula is based on the Hertz contact stress equation for cylinders with parallel axes. The concept incorporated is a spur gear whose shape in the transverse plane is similar to that of a helical gear in the normal plane.

Item Detail – AGMA B89 (reaffirmed March )

Newcomb Chicago Gear D. However, information is also contained for determining geometry factors for other conditions and applications. Over 24 teeth, assume a 0. Zgma load sharing ratio, mhr, was defined to A stress relate face width of the tooth to Lmin.

The radii of curvature, pnl, pn2, of the pinion and gear teeth at any point along the contact line are perpendicular 908–b89 the line of contact and the involute profiles at the point of contact. Cutters which act in the transverse plane, such 098-b89 helical disc shaper cutters and some rack shaper cutters will generate root trochoid forms which are slightly different from those assumed by this method.

Therefore it is possible to set the maximum limit for the calculation pre-set to 5. Seireg Academic Member E.


The tables were prepared by computer, programmed in accordance with Section 5. The optimum transmission ratio varies in the agma b89 The shift affects geometric and kinematic and strength characteristics as well.

Depending on the face contact ratio of the gearset, this point can be the mean diameter of the pinion or the lowest point of single tooth contact on the pinion. This paragraph contains agma b89 the stress values bend, contact necessary for the safety coefficient calculations. When designing non-power gearing, it is not necessary to solve and check any strength agma b For very accurate work, the exact cutter form should be used, but for most cases, the cutter form can be approximated.

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Directly choose, therefore, a suitable number of teeth and the module [4. This incorrect root corresponds to the case where the Lewis parabola is inverted, opening upward rather than downward.

If these values are not known, this Section provides a method for determining them. This Appendix presents the derivation of the pitting resistance formula and the I factor as used in this Information Sheet.

Notify me when available. The tooth thickness at the standard pitch diameter, the addendum modification coefficient and the tool addendum can be calculated from involute geometry and the information in Section 5 of AGMA B The knowledge required to convert the actual dimensions of a disk type cutter to the values necessary to determine the J factor of a specific gear is 908-8b9 the scope of this Information Agmaa.

Cohen Engranes y Maquinaria J. The fillet coordinates are best expressed by selecting the angle on as the independent parameter. The angular 908–b89 of tool, eno, is: This Information Sheet gives the equations for calculating the pitting resistance geometry factor, I, for external and internal spur and helical gears, and the bending strength geometry factor, J, for external spur 9008-b89 helical gears that are generated by racktype tools hobs, rack cutters or generating grinding wheels or piniontype tools shaper cutters.

Quantity must be a agma b89 whole number.

To locate this point, we consider the relative motion between the shaper cutter and the generated gear tooth.