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BS ISO 6626-2:2024 Internal combustion engines. Piston rings - Coil-spring-loaded oil control rings of narrow width made of cast iron, 2024
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Overview
- 5 Piston ring types and designation [Go to Page]
- 5.1 Types DFS-C, DFS-CNP, SSF, GSF, DSF, DSF-NG, and SSF-L — General features and dimensions
- 5.2 Type DSF-C ─ Coil-spring loaded bevelled edge oil control ring, chromium plated and profile ground [Go to Page]
- 5.2.1 General features and dimensions
- 5.2.2 Designation of a Type DSF-C piston ring in accordance with ISO 6626-2
- 5.3 Type DSF-CNP ─ Coil-spring loaded bevelled edge oil control ring, chromium plated not profile ground [Go to Page]
- 5.3.1 General features and dimensions
- 5.3.2 Designation of a Type DSF-CNP piston ring in accordance with ISO 6626-2
- 5.4 Type SSF ─ Coil-spring loaded slotted oil control ring with rectangular groove [Go to Page]
- 5.4.1 General features and dimensions
- 5.4.2 Designation of a Type SSF piston ring in accordance with ISO 6626-2
- 5.5 Type GSF ─ Coil-spring loaded double bevelled oil control ring [Go to Page]
- 5.5.1 General features and dimensions
- 5.5.2 Designation of a Type GSF piston ring in accordance with ISO 6626-2
- 5.6 Type DSF ─ Coil-spring loaded bevelled edge oil control ring [Go to Page]
- 5.6.1 General features and dimensions
- 5.6.2 Designation of a Type DSF piston ring in accordance with ISO 6626-2
- 5.7 Type DSF-NG ─ Coil-spring loaded bevelled edge oil control ring (face geometry similar to type DSF-C or type DSF-CNP) [Go to Page]
- 5.7.1 General features and dimensions
- 5.7.2 Designation of a Type DSF-NG piston ring in accordance with ISO 6626-2
- 5.8 Type SSF-L ─ Coil-spring loaded slotted oil control ring with rectangular groove at periphery and V-shaped groove beneath [Go to Page]
- 5.8.1 General features and dimensions
- 5.8.2 Designation of a Type SSF-L piston ring in accordance with ISO 6626-2
- 6 Common features [Go to Page]
- 6.1 Oil drainage by slots or holes [Go to Page]
- 6.1.1 Arrangement of slots
- 6.1.2 Slot length
- 6.1.3 Arrangement of holes
- 6.1.4 Diameter and number of holes
- 6.2 Plating thickness — DSF-C and DSF-CNP (coil-spring loaded bevelled edge oil control ring, chromium plated)
- 6.3 Peripheral edges at gap of chromium plated oil control rings
- 6.4 Spring groove, slot, and land offsets
- 7 Coil springs [Go to Page]
- 7.1 Types of coil spring
- 7.2 Latch pin and location of small pitch in the coil spring
- 7.3 Coil spring excursion (extended gap)
- 7.4 Position of coil spring gap and fixing
- 7.5 Material
- 8 Tangential force and nominal contact pressure [Go to Page]
- 8.1 Tangential force, Ft [Go to Page]
- 8.1.1 Force factors
- 8.1.2 General tangential force, Ft
- 8.1.3 Actual tangential force, Ft, and tolerance
- 8.1.4 Normalized tangential force, FN
- 8.2 Nominal contact pressure, p0
- 9 Dimensions
- Bibliography [Go to Page]
