ISO 6336-3 PDF


ISO (E). PDF disclaimer. This PDF file may contain embedded typefaces. In accordance with Adobe’s licensing policy, this file may. ISO – Search Results. Articles About This is the third article in a series exploring the new ISO gear rating standard and its methods of calculation. Buy ISO Calculation of load capacity of spur and helical gears Part 3: Calculation of tooth bending strength from SAI Global.

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The failure mode of micropitting is closely correlated to the lambda ratio. In the following, major influences of gear size on the 6336–3 factors as well as on the permissible tooth root bending and contact stress will be discussed.

The lower value of ZNT may be used for critical service, where pitting must be minimal.

BS ISO 6336-3:2006

Many of the compromises added complication to the edition of DINwhich was the basic document. You may experience issues viewing this site in Internet Explorer 9, 10 or NOTE a b For static stress and all materials.

All the standards base the bending strength on the Lewis equation; the ratings differ in the use and number of modification factors. Other relevant terms and symbols are defined in 5. The work of preparing International Standards is normally carried out through ISO technical committees. This method can be applied when values obtained from either gears or notched test pieces are not available, and is particularly suitable for evaluating, relative to one another, the tooth root strength values for different materials.

Sometimes, the destruction of all ios in a transmission can be a consequence of the breakage of one tooth. Method A is only used in special cases and, because of the great effort involved, is only justifiable in such cases.

The standards development process provides a scientific forum for discussion of product design, materials and applications, which can lead to product improvement. The use of different symbols, presentations, terminology, and definitions in these standards makes it very difficult.


These figures do not include hidden costs like time and money spent on internal improvements required to meet ISO certification. Calculation of tooth bending strength Licensed Copy: Spannungskonzentration von Kerben im Kerbrand, Konstruktion, 24,pp. Determination of YF by graphical means is not recommended.

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This first article will cover what ISO is, what some of its benefits – and problems – are, and whether your company should be a candidate for this certification process. See also Reference [6]. Gear measuring machine calibration methods are reviewed.

The principal influence factors are: Reasons for the choice of load application at the reference cylinder are given in 6. This standard has now been replaced by commercial sector standards including ISO Also see Clause Search by Author here. Values from a large number of tests are lso as typical damage or crack initiation curves for surface-hardened and nitride-hardened steels, or curves of yield stress for structural and through-hardened steels. It characterizes the notch sensitivity of the material, and its values depend on the material and the stress gradient.

As in the case for Method B, the test data shall be transformed to suit the gears of interest, using the absolute influence factors appropriate to the lso and the test piece: In Part 2 it will be shown that all geometric influences may be concentrated in one factor dependent on only four independent parameters, of which the gear ratio, the number of teeth of the pinion, and the addendum modification coefficient of the pinion are significant. However, consideration should be given to the use of optimum material quality and manufacturing, with selection of an appropriate safety factor.

Figure 15 — Size factor, YX, for tooth bending strength As in the case for Method B, the test data shall be transformed to suit the gears of interest, using the influence factors appropriate to both the method and the test piece: This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.


6336–3 up-front fees are only the beginning. The example calculation demonstrates a valid possibility to optimize the gear design by using local tooth contact analysis while satisfying the requirement of documenting the load carrying capacity by standard calculations. Problems with applying the standard to large gear measuring machines are considered and some recommendations offered.

Determination of YS by graphical methods is not appropriate.

ISO 6336-3 – Search Results

Pieter van Musschenbroek systematically tested the wooden teeth of windmill gears, applying the bending strength formula published by Galilei one century earlier. In order to determine the maximum tooth root stress, the effects of load distribution over two or more engaging teeth and changes of stress with changes of meshing phase shall be taken into consideration.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. The influence of gear size on the load-carrying capacity is considered with the 633-3 factors YX tooth root bending and ZX pittingbut there are further influences, which should be considered. The start and finish of text introduced or altered by corrigendum is indicated in the text by tags.

The cost required for this method is, in general, only justifiable for the development of new products, failure of which would have serious consequences e. Find Similar Items This product falls into the following categories. Calcul de la resistance a la flexion en pied de dent. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations.