DIN 740-2 1986-08 PDF

Full title and description

Power transmission engineering — Flexible shaft couplings — Parameters and design principles (DIN 740-2:1986-08). Provides terminology and calculation bases for flexible (non‑slip) shaft couplings with elastomeric or flexible metallic spring elements; published by the German Institute for Standardisation (Deutsches Institut für Normung).

Abstract

This standard defines coupling parameters, symbols and units, performance characteristics and basic calculation methods for the design of flexible shaft couplings. It covers types of stress, simplified and higher‑order calculation methods, load factors derived from practice, and worked examples; the methods are intended for linear two‑mass vibration systems under specified operating conditions.

General information

• Status: Current / Active (original publication remains listed as the dated edition and is offered by standards resellers).
• Publication date: August 1986 (1986-08 / 01 Aug 1986).
• Publisher: Deutsches Institut für Normung (DIN).
• ICS / categories: Power transmission / couplings (ICS code and category for coupling standards: 21.120.20 - couplings as used in power transmission contexts).
• Edition / version: 1986 edition (designated DIN 740-2:1986-08).
• Number of pages: 12 pages (typical published length listed by standards distributors).

Scope

DIN 740-2 specifies terms, design parameters and calculation procedures for non‑slip flexible shaft couplings used in power transmission. The scope includes the definition of coupling parameters and performance characteristics, classification of stress types in couplings, practical load factors, approximate and more detailed calculation methods, and example calculations aimed at typical two‑mass vibration situations. It applies to couplings with partially or fully flexible elastomer elements and to couplings using flexible metallic spring elements.

Key topics and requirements

• Terminology and definitions for flexible shaft couplings (symbols and units).
• Listing and definition of coupling parameters and performance characteristics.
• Identification and treatment of types of stress occurring in couplings.
• Design principles and use of practical load factors for sizing.
• Approximate (rough) calculation methods plus higher‑order methods for more accurate design.
• Worked examples to illustrate calculation procedures and application limits (noting restrictions for linear two‑mass vibration models).

Typical use and users

Used by mechanical design engineers, coupling and drivetrain manufacturers, component suppliers, test engineers and consultants for the selection, sizing and verification of flexible couplings in rotating machinery. Software tool developers for drivetrain and coupling design also reference DIN 740-2 when implementing normative calculation routines. Practical application in industry and CAD/CAE tools is reported by engineering vendors and design‑tool providers.

Related standards

DIN 740-1 (technical delivery conditions for flexible shaft couplings) is a closely related part of the series; DIN 740-2 is referenced in DIN handbook materials and by standards distributors as part of the DIN 740 family addressing couplings and power transmission. Users should also check for any later amendments, national adoptions or harmonised EN/ISO documents that may affect applicability.

Keywords

flexible shaft couplings; power transmission; coupling parameters; elastomeric couplings; spring couplings; design principles; coupling calculations; vibration; DIN 740.

FAQ

Q: What is this standard?

A: DIN 740-2:1986-08 is a German national standard that sets terminology, parameters and calculation bases for flexible (non‑slip) shaft couplings used in power transmission engineering.

Q: What does it cover?

A: It covers symbols and units for coupling parameters, performance characteristics, types of stress, practical load factors, simplified and advanced calculation methods, and worked examples for the design and evaluation of flexible couplings (noting limitations for the assumed vibration model).

Q: Who typically uses it?

A: Mechanical designers, coupling manufacturers, test and maintenance engineers, consultants and software developers for drivetrain design use it for selection, sizing and verification of flexible couplings.

Q: Is it current or superseded?

A: The 1986 edition is listed by standards distributors as the published edition; distributors classify it as the active/available edition. Users should verify with their national standards body or the DIN catalogue for any later revisions or replacements before relying on the text for compliance purposes.

Q: Is it part of a series?

A: Yes — DIN 740 is a series addressing flexible shaft couplings; DIN 740-1 (technical delivery conditions) is explicitly related and often used together with DIN 740-2. Check the DIN 740 family for additional parts.

Q: What are the key keywords?

A: Flexible coupling, elastomer coupling, spring coupling, coupling parameters, coupling performance, power transmission, DIN 740-2.