AGMA 1103-H07

This standard is applicable to external spur and helical gearswith 1.25 through 0.2 module and a profile angle of 20 degrees.

It only applies to standard gears with 24 teeth or more;enlarged pinions with 9 through 23 teeth; and reduced gears formeshing with enlarged pinions at standard center distances.

Much of this same information is applicable to internalgears.

Tooth proportions The tooth proportions shown hereinmay be usedfor many gear designs of finer than 0.2 module; however, suchdesigns should be checked for suitability, particularly in theareas of contact ratio, undercutting, and clearance.

This standard is similar to ISO 53, Cylindrical gears forgeneral and heavy engineering – Standard basic rack toothprofile.

The main difference between the proportions of fine- pitch gearsand those of coarse-pitch is in the clearance. In fine-pitchgearing, wear on the points of the cutting tools is proportionallygreater than in coarse- pitch tools. The fillet radius produced bysuch tooling will therefore be proportionally greater. Theincreased clearance in gearing of 1.25 module and finer providesboth for the relatively larger fillet and also for foreign materialthat tends to accumulate at the bottoms of the teeth.

Number of teeth Gear designs with low numbers of teeth should bechecked for suitability, particularly in the areas of contactratio, undercutting, and clearance, as well as for strength anddurability for load and life considerations.

Edition:

H07

Published:

01/01/2007

ANSI:

ANSI Approved

Number of Pages:

32