ISO 6621-1:2018

Internal combustion engines — Piston rings — Part 1: Vocabulary

ISO 6621-1:2018 defines the most commonly used terms for piston rings. These terms designate either types of piston rings or certain characteristics and phenomena of piston rings. The terms and definitions in this document apply to piston rings for reciprocating internal combustion engines. They may also be used for piston rings of compressors working under analogous conditions. NOTE 1 Further terms and definitions covering measuring principles are given in ISO 6621-2:2003. NOTE 2 This document gives the equivalent terms in the Chinese, English, French, German, Italian, Japanese, Portuguese, Russian and Spanish language.

Moteurs à combustion interne — Segments de piston — Partie 1: Vocabulaire

General Information

• Status: Published
• Publication Date: 04-Mar-2018
• ICS: 01.040.43 - Road vehicle engineering (Vocabularies)
• ICS: 43.060.10 - Engine block and internal components
• Technical Committee: ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
• Drafting Committee: ISO/TC 22/SC 34/WG 4 - Piston rings
• Current Stage: 9092 - International Standard to be revised
• Completion Date: 01-Nov-2023

Relations

• Revises: ISO 6621-1:2007 - Internal combustion engines — Piston rings — Part 1: Vocabulary
• Effective Date: 05-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6621-1
Third edition
2018-02
Internal combustion engines —
Piston rings —
Part 1:
Vocabulary
Moteurs à combustion interne — Segments de piston —
Partie 1: Vocabulaire
Reference number
ISO 6621-1:2018(E)
©
ISO 2018

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ISO 6621-1:2018(E)

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ii © ISO 2018 – All rights reserved

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ISO 6621-1:2018(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Piston ring classification . 5
5 Piston ring types . 6
5.1 Cross-section configuration . 6
5.2 Peripheral surface configuration . 7
5.3 Edge configuration . 9
5.4 Coated, plated and nitrided surfaces configuration .10
5.5 Joint configuration .11
6 Piston ring nomenclature .11
6.1 Free (unstressed) ring .11
6.2 Closed ring .11
6.3 Assembled ring in closed condition .12
6.4 Edges, surfaces and faces .13
6.5 Chamfered edges .14
6.6 Scraper ring .14
6.7 Oil control
...