This standard is applicable to marine reduction and reversing gears, including those used in capital ships, as follows:
Although the above referenced power requirements are based on actual operating experience, the design criteria in this standard are also applicable to larger power prime movers. As with any new application, caution should be exercised when extrapolating requirements outside of the current experience range.
In this standard, capital ships are vessels characterized by larger tonnage, higher horsepower, or deep water operation.
The fundamental rating formulas are applicable for rating the pitting resistance and bending strength of external spur, helical, or double helical involute gear teeth. The formulas evaluate gear tooth capacity as influenced by the major factors which affect gear tooth pitting and gear tooth fracture.
This standard also addresses bearings, clutches and controls, lubricating systems, shaft stresses, balance and system vibrations. Gear blank design is not addressed.
This standard provides a method by which different gear designs can be compared. It is intended for use by the experienced gear designer capable of selecting reasonable values for the various factors, based on their knowledge of performance of similar designs and the effects of such items as lubrication, deflection, manufacturing tolerances, metallurgy, residual stress and system dynamics.
The majority of marine gears are of helical or double helical tooth design. Spur gear tooth designs are not generally used except for power take-off drives and reversing sections of marine gear units.
This standard is not intended to assure performance of assembled gear drive systems, and is not intended for use by the engineering public at large.
This standard does not cover:
The determination of gear mesh efficiency or overall drive efficiency is beyond the scope of this standard.
This standard does not cover the rating of gear drives due to the wear or scuffing (scoring) of gear teeth or components. See AGMA 925-A03 for a consideration of scuffing.
Marine gear rating parameter sheet
A marine gear rating parameter sheet is included in Annex A to assist in determining the actual applicability of a gear for its intended service.
It is recognized that marine units may be rated in different manners for the same service. Annex E provides additional information on alternative rating methods applied by marine classification societies.
[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI/AGMA 6132-B13, Standard for Marine Gear Units: Rating and Application for Spur and Helical Gear Teeth (Metric Edition).]
This standard presents the methodology for determining the ratings of marine reduction and reversing gear systems driven by internal combustion engines, electric motors, and steam or gas turbines. It does not cover separate power generation drives, pump set drives, conveyor drives, deck machinery or the design and application of epicyclic drives.
This standard interprets ANSI/AGMA 2101-D04 for use by the marine industry considering the successful practice of marine gear manufacturers and the incorporation of its predecessor standards into the American Bureau of Shipping (ABS) Rules for Building and Classing Steel Vessels, as they existed, prior to 2000. The ABS Rules were based on AGMA rating Standards 211 and 221 as published in the early 1970’s.
The previous version of this standard was based on ANSI/AGMA 2001-A88 and, except where indicated, all changes incorporated in ANSI/AGMA 2101, up to and including the present version, are captured herein. These changes include, but are not limited to, moderate revisions to the allowable stresses, σHP and σFP, of some materials and a redefining of the dynamic factor, Kv.
Changes of note to this standard include:
The overall effect of these changes is a reduction of the allowable transmitted power, for pitting resistance and bending strength, of the gearset. This reduction is essentially due to the inclusion of the service factors, CSF and KSF.
The first draft of ANSI/AGMA 6132-B13 was made in August, 2012. It was approved by the AGMA membership in October, 2013. It was approved as an American National Standard on September 23, 2013.
Suggestions for improvement of this standard will be welcome. They may be submitted to [email protected]
The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
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