ISO 6627 pdf download

ISO 6627 pdf download Internal combustion engines — Piston rings — Expander/segment oil-control rings
1 Scope
This International Standard specifies the essential dimensional features of expander/segment oil-control rings, without providing a complete product description (because expander-spacer design varies from piston-ring manufacturer to piston-ring manufacturer, the interaction between the manufacturer and the client will determine specific design details).
This International Standard applies to expander/segment oil-control rings of nominal diameters ranging from 40 mm to 1 25 mm for reciprocating internal combustion engines for road vehicles and other applications. It also applies to piston rings for compressors working under analogous conditions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6621 -2, Internal combustion engines — Piston rings — Part 2: Inspection measuring principles
ISO 6621 -3, Internal combustion engines — Piston rings — Part 3: Material specifications
ISO 6621 -4, Internal combustion engines — Piston rings — Part 4: General specifications
ISO 6626, Internal combustion engines — Piston rings — Coil-spring-loaded oil control rings
3 Symbols and abbreviated terms
For the purposes of this International Standard, the symbols and abbreviated terms in Table 1 apply.
4.3 Designation examples
The following are examples of piston ring designations in accordance with this International Standard.
EXAMPLE 1 Expander/segment oil-control ring type ES1 (ES1 ) of nominal diameter d 1 = 90 mm (90) and nominal assembly width h 1 = 3 mm (3,0), with segments made of unalloyed steel subclass 68 (MC68), a chromium-plated peripheral surface of minimum thickness 0,05 mm (CR1 ), and with an expander made of 1 6 % Cr (min.) austenitic steel, of material subclass 67 (MC67) and tangential force, F t , according to the medium nominal contact pressure class (PNM):
Piston ring ISO 6627 – ES1-90 × 3,0-MC68/CR1-MC67/PNM
EXAMPLE 2 Expander/segment oil-control ring type ES2 (ES2) of nominal diameter d 1 = 90 mm (90) and nominal assembly width h 1 = 2,5 mm (2,5), with segments made of 1 1 % Cr (min.) martensitic steel, subclass 65 (MC65), nitrided on the peripheral and inside surfaces (NS020) to a minimum depth of 0,020 mm on the peripheral surface, and with an expander made of 1 6 % Cr (min.) austenitic steel, of material subclass 67 (MC67), nitrided on the surface (NX), and tangential force, F t , according to the reduced nominal contact pressure class (PNR):
Piston ring ISO 6627 – ES2-90 × 2,5-MC65/NS020-MC67/NXPNR
EXAMPLE 3 Expander/segment oil-control ring type ES3 (ES3) of nominal diameter d 1 = 90 mm (90) and nominal assembly width h 1 = 4,0 mm (4,0), with segments made of unalloyed steel subclass 68 (MC68), a chromium-plated peripheral surface of minimum thickness 0,05 mm (CR1 ) with lapped stripe (h24) of 0,30 mm, and with an expander made of 1 6 % Cr (min.) austenitic steel, of material subclass 67 (MC67) and tangential force, F t , according to the high nominal contact pressure class (PNH):
Piston ring ISO 6627 – ES3-90 × 4,0-MC68/CR1-MC67/PNH