AGMA 6032-B13

Application

This standard is applicable to marine reduction and reversing gears, including those used in capital ships, as follows:

– marine propulsion reduction gears driven by internal combustion engines or electric motors from 1,500 to 20,000 horsepower per prime mover, with rotor speeds not exceeding 3600 rpm;

– marine propulsion reduction gears driven by steam or gas turbines from 1,500 to 30,000 horsepower per prime mover;

– power take-off (PTO) gearing that is integral to the propulsion unit;

– auxiliary propulsion gears;

– combinations of drives listed above.

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.

Intended use

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.

Exceptions

This standard does not cover:

– separate power generation drives;

– pump set drives;

– conveyor drives;

– deck machinery;

– epicyclic drives.

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.

Alternative ratings

It is recognized that marine units may be rated in different manners for the same service. Annex D provides additional information on alternative rating methods applied by marine classification societies.

Edition:

B13

Published:

09/23/2013

ANSI:

ANSI Approved

Number of Pages:

52

File Size:

1 file , 980 KB