GOST 24438-80 PDF

Full title and description

GOST 24438-80 — "Передачи глобоидные. Исходный червяк и исходный производящий червяк" (Globoid gears. Basic worm and basic generating worm). The standard specifies the nominal geometry (profiles) of the basic/starting globoid worm and the basic generating globoid worm and the radial clearances for globoid gear pairs operating with a 90° shaft angle.

Abstract

This GOST defines the parameters and geometrical relationships for globoid (double‑enveloping) worm gear pairs whose worm flank surfaces are generated by a straight line (or a generating straight line rotated to form the surface). It covers nominal tooth‑form parameters, mating contours for the basic worm and basic generating worm, and prescribed radial clearances for typical center distances (up to the limit given in the standard). The document excludes special‑purpose or non‑standard globoid transmissions.

General information

• Status: Active / in force (maintained as a national GOST; amendments recorded).
• Publication date: Approved 1980 (designation -80); officially published/entered into force from 01 January 1982 (date of introduction). Some bibliographic records show an official edition date in 1981.
• Publisher: Originally issued by the State Committee for Standards of the USSR (Gosstandart); contemporary custodianship/availability handled by national standards publishers (Rosstandart / publishing houses distributing GOST texts).
• ICS / categories: Mechanical engineering / machine elements — gearing (gear design, worm and globoid gearings). (Relevant classification: mechanical systems and components for general use; manufacturing/gear technology categories.)
• Edition / version: Original GOST 24438-80 (with at least one recorded amendment/technical change noted in databases).
• Number of pages: 9 pages (original text length as recorded in multiple standards repositories).

Scope

The standard applies to globoid (double‑enveloping) worm gear sets with localized or non‑localized contact, where the nominal worm flank surfaces are formed by a straight line or a generating straight line rotated about an axis, for gear pairs with a shaft angle of 90° and centre distances up to the limit specified in the standard (commonly cited as up to 630 mm). It establishes the contours/parameters of the basic (reference) worm and the basic generating worm and the radial clearance requirements; it does not cover special‑purpose or custom constructions.

Key topics and requirements

• Definition of the basic (reference) globoid worm and the basic generating globoid worm tooth contours (profiles) for double‑enveloping worm gearings.
• Dimensional parameters and nominal geometry for meshing of globoid worm and wheel (including profile/contour relationships).
• Specified radial clearances for globoid transmissions (requirements for correct spacing and assembly).
• Application limits: 90° shaft angle typical; centre‑distance range covered (up to the standard limit, commonly cited as 630 mm).
• Exclusion clause: does not apply to special‑purpose or specially constructed globoid transmissions.

Typical use and users

Design and manufacturing engineers in mechanical power‑transmission and gear‑manufacturing industries; gearbox designers; machine‑tool builders; repair and maintenance workshops working on worm‑gear reducers and precision drives; standards librarians and technical documentation teams referencing gear design norms. The standard is used as a reference for producing mating tools, checking gear geometry, and specifying replacement parts for globoid worm sets.

Related standards

GOST 16530-83 (terms and definitions for gear transmissions) and other GOSTs covering worm and globoid gear tolerances and parameters (for example, standards on tolerances and interchangeability for globoid gear sets and later GOSTs that reference or build on GOST 24438-80). Internationally, AGMA/ANSI and ISO documents on worm and globoid gearing (gear‑geometry and design practices) are complementary references.

Keywords

globoid gears, double‑enveloping worm, basic worm, generating worm, worm gear, radial clearance, gear parameters, 90° shaft angle, centre distance up to 630 mm, GOST 24438-80.

FAQ

Q: What is this standard?

A: GOST 24438-80 is a Soviet/Russian national standard that specifies the basic (reference) worm and the basic generating worm contours and radial clearance requirements for globoid (double‑enveloping) worm gear pairs.

Q: What does it cover?

A: It covers nominal tooth‑form parameters and mating geometry for globoid worm pairs (with worm flank surfaces generated by a straight line), the radial clearances required for correct meshing, and application limits (90° shaft angle and centre distances within the standard's stated range). Special‑purpose or non‑standard globoid transmissions are excluded.

Q: Who typically uses it?

A: Gear designers, gearbox manufacturers, machine‑builders, maintenance engineers, and technical libraries/cataloguers who need authoritative geometric parameters and assembly clearances for globoid worm gear design and production.

Q: Is it current or superseded?

A: Databases and standards sellers list GOST 24438-80 as active (with at least one recorded amendment). Users should check the national standards registry or current catalogs for any later revisions or replacements before use in regulatory or procurement contexts.

Q: Is it part of a series?

A: Yes — it forms part of the family of standards covering globoid and worm gear transmissions (terminology, tolerances, geometry and related normative documents such as GOSTs on terms, tolerances and calculation methods). Several later or related GOSTs reference or complement 24438-80.

Q: What are the key keywords?

A: Globoid gears; basic worm; generating worm; double‑enveloping worm gear; radial clearance; gear geometry; 90° shaft angle; centre distance; GOST 24438-80.