This information sheet covers current gear design practices as they are applied to air vehicles and spacecraft. The material included goes beyond the design of gear meshes per se, and presents, for the consideration of the designer, the broad spectrum of factors which combine to produce a working gear system, whether it be a transmission, gearbox, or special purpose mechanism. Although a variety of gear types, such as wormgears, face gears and various proprietary tooth forms are used in aerospace applications, this document covers only conventional spur, helical, and bevel gears.
AGMA 911-A94 supersedes AGMA Standard 411.02, Design Procedure for Aircraft Engine and Power Take-Off Spur and Helical Gears. Its purpose is to provide guidance to the practicing aerospace gear engineer in the design, manufacture, inspection, and assembly of aerospace gearing. In addition, it addresses the lubrication, environmental, and application conditions which impact the gearbox as a working system of components.
Material in the Information Sheet is supplemental to current AGMA Standards but does not constitute a Standard itself. By definition, Standards reflect established industry practice. In contrast, some of the practices discussed here have not seen enough usage to be considered standard, but they do provide insight to design techniques used in state-of-the-art aerospace equipment. It is expected that the user of this Information Sheet will have some general experience in gear and machine design, and some knowledge of current shop and inspection practices.
AGMA 911-B21 replaces AGMA 911-A94. This revision reorganized and updated the previous sections to current practices. The scope was expanded to include gear systems not just gearing. The title of the document was changed from Design Guidelines for Aerospace Gearing to Design Guidelines for Aerospace Gear Systems. Annexes C and D were added to cover alternative tooth geometry and asymmetric teeth. Annex E was added to give examples of rotorcraft regulations.
The first draft of AGMA 911-B21 was made in January 2013. It was approved by the technical committee in September 2020. It was approved by the Technical Division Executive Committee (TDEC) in May 2021.
This information sheet covers current gearbox design practices as they are applied to air vehicles and spacecraft. The material included goes beyond the design of gear meshes and presents the broad spectrum of factors which combine to produce a working gear system, whether it be a power gearbox or special purpose mechanism. Although a variety of gear types, such as wormgears, face gears and various proprietary tooth forms are used in aerospace applications, this document covers only spur, helical, and bevel gears.
The following documents contain provisions which, through reference in this text, constitute provisions of this information sheet. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this information sheet are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
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