standard share much in common with DIN. This paper con- siders BS , the draft ISO standard , and AGMA. Since this review was written. This standard specifies a method for rating the pitting resistance and bending .. In AGMA the values for Life Factor, CL and KL, Dynamic Factor, Cv and. Documents Similar To AGMA AGMA A Uploaded by. simone. castagnetti · AGMA. Uploaded by. Dipak · ANSI_AGMA_A Uploaded.
|Published (Last):||4 May 2007|
|PDF File Size:||8.54 Mb|
|ePub File Size:||9.13 Mb|
|Price:||Free* [*Free Regsitration Required]|
Interference exists between tips of teeth and root fillets. Sgma is not intended for use by the engineering public at large. It is not intended for use by the engineering public at large. A new rim thickness factor, K Bwas introduced to reduce allowable bending loads on gears with thin rims.
Undercut exists in an area above the theoretical start of active profile.
Helical self-aligning pinions are beyond the scope of this standard. Rating formulae The formulae included determine the allowable fatigue ayma for pitting resistance and bending strength of steel gears with machined single or double helical external involute gear teeth only. This information is provided for evaluation by users of this standard, with the intent to include a scuffing evaluation method in a future version of this standard. Empirical factors given in this standard are general in nature.
Geometrical definitions ISO At the time of publication, the editions indicated were valid. The formulas evaluate gear tooth capacity as influenced by the major factors which affect gear tooth pitting and gear tooth fracture at the fillet radius. The constants and coefficients used in curve fitting often have significant digits in excess of those inferred by the reliability of the empirical data. This standard was written to xtandard the fundamental differences between typical enclosed drive applications and rolling mill applications.
Case-hardening steels ISO Formulas do not apply to external loads such as dropped charges, electrical short circuits and earthquakes.
Quantity must be a positive whole number. Where empirical values for rating factors are given by curves, curve-fitting equations are provided to facilitate computer programming.
Item Detail – ANSI/AGMA A13 (reaffirmed December 17, )
The Y J factor calculation uses the stress concentration factors developed by Dolan and Broghamer . This standard includes a method by which different gear tooth designs can be rated and compared at extended life cycles typical for these applications, up to hours.
Direct hardening and low-alloyed wrought steel in form of different black products ISO Where root fillets of the gear teeth are produced by a process other than generating. Quantity must be a abma whole number. Rating procedures are limited to open or semi-enclosed gearing where the gear reaction forces are transmitted through a structure which provides independent bearing support for the gear and pinion.
This standard is intended for use by the experienced gear designer, capable standar selecting reasonable values for the factors. Rating formulas are valid only when components are installed according to gear manufacturer or original equipment supplier’s recommendation. Scuffing criteria are not included in this standard.
It is imperative that the overall system designer be satisfied that the system of connected rotating parts is compatible, free from critical speeds and from torsional or other vibrations within the stanard speed range, no matter how induced. Applicability Applications include but are not limited to, hot mills and cold mills, roughing and finishing stands: Additional limitations are noted within the body of this standard.
Changes to the standard include a method by which different gear tooth designs can be rated and compared at the abma life cycles typical for these applications. Limitations The limitations listed below are not a comprehensive list. Face widths in excess of the 40 inches limitation contained sgandard previous standards are also accommodated, as is a calculation method for load distribution factor, K mat these extended face widths.
Exceptions The formulas of this standard are not applicable to determine rating capacity for other types of gear tooth deterioration such as plastic deformation, adhesive or abrasive wear, subcase fatigue, and scuffing.
Quantity must be a positive whole number. Proper evaluation of these factors is essential for realistic ratings. These rating formulas are applicable for rating the pitting resistance and bending strength of external involute gear teeth ama on ama axes with adjustable center distances.
This standard is intended for use by the experienced gear designer capable of selecting reasonable values for rating factors and aware of the performance of afma designs through test results or operating experience. Case-hardening steels ISO Calculation of service life under variable load ISO The purpose of this standard is to establish a common base for rating various types of gears for differing applications, and to encourage themaximum practical degree of uniformity and consistency between rating practices within the gear industry.
It was approved as an American National Standard on May 20, It also reflects a change to clause 10, dealing with the relationship between service factor and stress cycle factor. The formulas are applicable to steel, ductile iron spheroidal graphitic ironand austempered ductile iron ADI with machined spur, single helical, double helical, or herringbone gear teeth.
This new standard became AGMA For most designs covered by this standard, pointed teeth are defined as those with normal chordal top land thickness, t oless than 0.
It provides the basis from which more detailed AGMA application standards are developed, and provides a basis for calculation of approximate ratings in the absence of such standards.
Calculation of service life under variable loadwhich was published in August These fundamental rating formulas are applicable for rating the pitting resistance and bending strength of internal and external spur and helical involute gear teeth operating on parallel axes.
They may be submitted to tech agma. For root profiles which are stepped or irregular, other stress correction factors may be more appropriate. Mixing values from other standards with those from this standard could lead to erroneous ratings.
Semi-enclosed gears operate with a guard that provides some degree of protection against contamination from dust or dirt and retains lubricant.
Single helical designs with face widths as large as 60 inches and double helical designs with effective face widths as large as 90 inches are not uncommon in these applications.
This standard is not applicable when any of the following conditions exist: