TS ISO 1122-2

TS ISO 1122-2 is a terminology standard that brings together the terms and definitions used for the geometry of worm gears. It supports consistent technical language in gear design, manufacturing, and documentation, with a specific focus on the geometric description of worm and worm wheel arrangements.

The role of terminology in worm gear geometry

Worm gear sets are used to transmit motion between non-parallel, non-intersecting shafts and are often selected where high reduction ratios are needed. In this field, naming matters: terms such as worm, wheel, pitch, module, lead angle, and related geometric concepts directly shape calculations, drawings, and manufacturing communication. The subject of this standard is the vocabulary used to describe those geometric features.

What this part is focused on

• It covers the section of the international gear vocabulary devoted solely to worm gear geometry.
• Its scope is the geometrical definitions related to worm gear wheels and associated concepts.
• It supports terminological consistency, but it should not be read as a design rule or performance specification in its own right.

In general technical practice, clear terminology helps keep calculation notes, technical drawings, quality records, and communication between manufacturers aligned. In gear engineering especially, even small differences in wording can change how geometry is interpreted, so vocabulary standards provide a common reference language for the discipline.