GOST 27701-88 PDF

Full title and description

GOST 27701-88 — Cylindrical worm reduction gears. Basic parameters (Редукторы червячные цилиндрические. Основные параметры). The standard establishes series of main dimensional and performance parameters for single‑ and two‑stage cylindrical worm gear reducers of general engineering application.

Abstract

GOST 27701-88 specifies mandatory basic parameters (such as center distances, nominal gear ratios, axis heights referenced to related standards, permissible deviations of actual ratios, nominal torque values and limits on input speed) for cylindrical worm reduction gears used in general machinery. It includes provisions for one‑ and two‑stage units and incorporates Amendment No.1 (1992) that has been integrated into the text.

General information

• Status: Active (in force).
• Publication date: Introduced 01 January 1989 (designation year 1988).
• Publisher: Adopted by the State Committee for Standards of the USSR (Gosstandart); printed/reissued by the Publishing House of Standards / official standards publishers in Moscow.
• ICS / categories: ICS 21.200 (gears / mechanical transmissions) — classified under mechanical components and gear transmissions.
• Edition / version: GOST 27701‑88 (original 1988 designation), entered into force 01.01.1989; Amendment No.1 (1992) integrated into the text.
• Number of pages: 3–4 pages depending on print/reprint (commonly published as a short 4‑page official standard).

Scope

This standard applies to single‑ and two‑stage cylindrical worm gear reducers for general engineering use. It establishes the series of main parameters to be adopted by manufacturers and designers — including center‑distance series, nominal gear ratios and allowable deviations, standard heights of axes (by reference to related standards), nominal torque selection tables and limits on input shaft speed (normally up to 1800 rpm, with permitted increases to 3000 rpm in technically justified cases subject to sliding‑speed limits). The standard sets mandatory requirements for these parameters and is intended for use in design, production and conformity assessment of such gear units.

Key topics and requirements

• Series of center distances to be used for one‑ and two‑stage cylindrical worm reducers (ranges defined and referenced to ГОСТ 2144).
• Nominal series of transmission ratios for one‑stage and two‑stage reducers, and permissible deviations of actual ratios (typical ±5% one‑stage, ±8% two‑stage as indicated by the standard tables).
• Nominal axis heights and permissible deviations referenced to related standards (e.g., ГОСТ 24386 for shaft heights).
• Limits on input shaft rotational speed (normal maximum 1800 rpm; permitted up to 3000 rpm under technical justification with sliding‑speed limit not exceeding 10 m/s).
• Nominal allowable torques on slow shafts and selection tables for different gear geometry classes and reduction ratios.
• Mandatory status of requirements (the standard establishes obligatory parameter series and tolerances to ensure interchangeability and predictable performance).

Typical use and users

Manufacturers of gear reducers and motor‑reducers, mechanical designers, gearbox specification and procurement teams, quality and conformity assessment laboratories, repair and maintenance organizations, and standards/technical libraries use GOST 27701‑88 to define accepted dimensional series, performance limits and tolerances for cylindrical worm reduction gears in industrial machinery.

Related standards

Referenced and related documents include ГОСТ 2144 (series of basic sizes / center distances), ГОСТ 24386 (axis heights and related tolerances), normative texts on torque selection and testing, and other GOSTs for gear and reducer types (for example ГОСТ 26543‑94 for planetary gear reducers). The standard was issued by Gosstandart and is listed together with other reducer/gear GOSTs in regulatory orders that maintain their status.

Keywords

worm gear, cylindrical worm reducer, gear reducer, center distance series, transmission ratio, axis height, allowable torque, input speed limit, ГОСТ 27701‑88.

FAQ

Q: What is this standard?

A: GOST 27701‑88 is a Soviet / Russian state standard titled "Редукторы червячные цилиндрические. Основные параметры" (Cylindrical worm reduction gears — Basic parameters) that defines mandatory series of dimensional and performance parameters for single‑ and two‑stage cylindrical worm gear reducers.

Q: What does it cover?

A: It covers the main geometric and performance parameters to be adopted for these reducers — center distances, nominal transmission ratios and tolerances, axis heights (by reference), nominal torque values and limits on input shaft speed — and establishes these as required series/tables for manufacturers and designers.

Q: Who typically uses it?

A: Gearbox and motor‑reducer manufacturers, mechanical designers and engineers, procurement/specification professionals, test and quality labs, and maintenance/repair services consult this standard when specifying, producing or inspecting cylindrical worm reducers.

Q: Is it current or superseded?

A: The standard is listed as active (in force). Amendment No.1 (approved in 1992) has been integrated; national practice shows periodic reprints. Users should check the latest national standards catalogues or the relevant standards publisher for any later revisions or replacements before relying on the standard for regulatory compliance.

Q: Is it part of a series?

A: Yes — GOST 27701‑88 is one of a group of GOSTs concerning gearboxes and reducers; it explicitly references other GOSTs (e.g., ГОСТ 2144 for center distances, ГОСТ 24386 for axis heights) and sits alongside related standards for planetary and other reducer types.

Q: What are the key keywords?

A: Worm gear, cylindrical worm reducer, gear reducer, center distance, gear ratio, axis height, torque, input speed, ГОСТ 27701‑88.