GOST 16532-70 PDF

Full title and description

GOST 16532-70 — Cylindrical involute external gear pairs. Calculation of geometry. The standard specifies methods and formulae for determining the geometric parameters of cylindrical (spur and helical) involute gear pairs used in external engagement, including allowances for profile shift, chordal thickness, and checks for interference and undercut during design and inspection.

Abstract

This GOST defines procedures to calculate the geometry of cylindrical involute gear pairs (both straight-tooth and helical), supplying formulas, verification checks (interference, undercut, face overlap), and reference contours for initial profile generation. It is intended to ensure correct mating geometry and manufacturability of gear pairs within the scope of state/interstate technical regulation.

General information

• Status: Active (ДЕЙСТВУЕТ) — limitation of validity lifted by Госстандарт decision No. 728 (10 Feb 1983).
• Publication date: Designation year 1970; entered into force 01 January 1972.
• Publisher: Межгосударственный стандарт / State (Interstate) Standard — original USSR Gosstandart publication.
• ICS / categories: OKС / КГС: ОКС 21.200 (mechanical engineering — gears and gearings), KGS G15 (machine elements).
• Edition / version: Original GOST 16532-70 (1970 designation); text and editorial form commonly distributed in Russian; later referenced by subsequent gear-related GOSTs.
• Number of pages: 44 pages (typical published copy).

Scope

The standard covers calculation procedures for the geometry of cylindrical involute external gear pairs: computation of pitch and reference diameters, tooth thickness including chordal thickness, profile and helix geometry, profile-shift (addendum/dedendum) effects, criteria and checks for interference and undercut, and recommendations for determining measurements on non-standard diameters (measuring diameter dy). It applies to spur and helical external gear pairs intended for mechanical power transmission and design/inspection tasks.

Key topics and requirements

• Definition and formulas for calculating basic geometric parameters of involute cylindrical gears (module, pitch, reference and addendum/dedendum diameters).
• Procedures for computing tooth thickness by chord and related measurement heights (Sc, hc) including use of an alternative measuring diameter dy.
• Rules for profile-shift (correction coefficients) and their influence on contact geometry and center distance.
• Checks for interference, undercutting and allowable profile limits; blocking-contour methods for preliminary interference assessment.
• Special provisions for helical (angled-tooth) gears: equivalent tooth-number substitution, axial/face-overlap coefficient checks and additional conditions for helix widths.
• Appendices with illustrative blocking contours and guidance for manufacturability checks (hob and shaper processing considerations).

Typical use and users

Used by mechanical design engineers, gear designers, machine-tool and gearbox manufacturers, quality/inspection engineers, technical standards libraries, and academic programs in machine elements and gearing. Typical applications include preliminary design and verification of mating gear geometry, setting up inspection procedures for chordal thickness and interference checks, and preparing manufacturing documentation for spur and helical gear pairs.

Related standards

Commonly referenced and related standards include GOST 13755 (basic rack / initial contour for cylindrical gears), GOST 9587 (basic profiles and related contours), GOST 19325 (terms and symbols for bevel gears and gear terminology), and later-strength/analysis standards such as GOST 21354-87 (strength calculation for cylindrical involute gears). These documents form a suite for geometry, profile definition, strength calculation and interchangeability for gears.

Keywords

cylindrical gears, involute gears, spur gears, helical gears, gear geometry, chordal thickness, profile shift, interference check, undercut, module, pressure angle

FAQ

Q: What is this standard?

A: GOST 16532-70 is a Soviet/Interstate technical standard that defines calculation methods and checks for the geometry of cylindrical involute external gear pairs (spur and helical).

Q: What does it cover?

A: It covers formulas and procedures to compute diameters, tooth thickness (including chordal thickness), effects of profile shift, interference and undercut checks, and specific recommendations for measurement and manufacturability checks (including guidance for alternate measuring diameters).

Q: Who typically uses it?

A: Gear designers, mechanical engineers, gearbox manufacturers, inspection/quality engineers, and educators in machine design use this standard to design and verify involute cylindrical gear pairs.

Q: Is it current or superseded?

A: The standard is listed as active (ДЕЙСТВУЕТ) in current GOST collections; its limitation of validity was removed by a Госстандарт action (decision No. 728 of 10 Feb 1983). However, later GOSTs addressing strength and related topics (for example GOST 21354-87) should be consulted when performing strength calculations or updated design checks.

Q: Is it part of a series?

A: Yes — it belongs to the family of GOSTs governing gear geometry, profile definitions and calculations; it is typically used alongside standards that define basic contours, terminology and strength calculation methods for gears.

Q: What are the key keywords?

A: Cylindrical involute, spur gear, helical gear, gear pair, geometry calculation, chordal thickness, interference, profile shift, module, pressure angle.