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GB/T 1148-2010 English PDF (GBT1148-2010)

GB/T 1148-2010 English PDF (GBT1148-2010)

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GB/T 1148-2010: Internal combustion engines -- Aluminium pistons -- Specifications

This Standard specifies the internal combustion engine casting aluminium piston each part name, technical requirements, test methods, inspection rules, mark, package, transport and storage.
GB/T 1148-2010
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 27.020
J 92
Replacing GB/T 1148-1993
Internal combustion engines ?€?
Aluminium pistons - Specifications
ISSUED ON. NOVEMBER 10, 2010
IMPLEMENTED ON. MARCH 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Names of each part of the piston ... 5
4 Technical requirements ... 8
5 Inspection methods ... 17
6 Acceptance rules ... 22
7 Mark, package, transport and storage ... 22
Foreword
This Standard is the revision to GB/T 1148-1993 "Aluminium piston -
Reciprocating internal combustion engines - Technical specifications".
Compared with GB/T 1148-1993, the main technical changes are as follows. - Replace the photos of Part 3; add names for some parts;
- Add dimensional tolerance of ring-land?€?s outer-diameter, ring-groove?€?s root- diameter, and ring-groove?€?s width in technical requirements; specify the volume of combustion chamber, the size of circlip-groove as well as the size of dowel-pin; and refine the piston?€?s mass difference of which the mass is less than 400 g;
- Add provisions in technical requirements on inner cooling gallery,
cleanliness and surface treatment;
- Make necessary modifications and additions to some test methods.
This Standard replaces GB/T 1148-1993 since its implementation.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Standardization Technical Committee of Internal Combustion Engine (SAC/TC 177).
Drafting organizations of this Standard. Shanghai Internal Combustion Engine Research Institute, Shandong Binzhou Bohai Piston Co., Ltd., Chengdu Galaxy Power Co., Ltd., AND Shijiazhuang Jingang Internal Combustion Engine Parts Group Ltd.
Main drafters of this Standard. Su Qinghua, Lin Fenghua, Ma Xuejun, Wen Jun, Liu Jindong, Jiang Dianchang and Ren Dezhong.
The previous versions replaced by this Standard are.
- GB 1148-1982 and GB/T 1148-1993.
Internal combustion engines ?€?
Aluminium pistons - Specifications
1 Scope
This Standard specifies the internal combustion engine casting aluminium piston?€?s each part?€?s name, technical requirements, test methods, inspection rules, mark, package, transport and storage.
This Standard is applicable to reciprocating-piston internal combustion engine casting aluminium piston of which the cylinder diameter is not greater than 200 mm (hereinafter referred to as piston).
2 Normative references
The following referenced documents are indispensable for the application of this Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard.
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 893.1 Circlips for holes - Type A
GB/T 893.2 Circlips for holes - Type B
GB/T 1149.1 Internal combustion engines - Piston rings - Part 1. General specifications (GB/T 1149.1-2008, ISO 6621-4.2003)
GB/T 1800.1-2009 Geometrical product specifications (GPS) - Limits and fits - Part 1. Bases of tolerances deviations and fits (ISO 286-1.1988,MOD)
GB/T 1958-2004 Geometrical product Specifications (GPS) - Geometrical
tolerance - Verification prescription
GB/T 2828.1 Sampling procedures for inspection by attribute - Part 1.
Sampling schemes indexed by acceptance mass limit (AQL) for lot-by-lot
inspection (GB/T 2828.1-2003, ISO 2859-1.1999, IDT)
17f Lower side face angle of keystone ring-groove 33 Wear-resistant ring carrier 18 Combustion chamber 34 Serrated top lands
18a Inner diameter of combustion chamber 35 Oil accumulation groove
18b Outer diameter (also known as throat) of combustion chamber 36 Scrape oil groove 18c Depth of combustion chamber 37 Steel control strut
19 Inner cooling gallery 38 Oil drain hole
20 Pin-bore 39 Decompression cavity
21 Pin-bore axis 40 Drain hole on the pin boss
22 Upper pin boss 41 Transverse slot hole
23 Lower pin boss 42 Transverse slot
24 Pin-bore sleeve 43 Longitudinal slot
25 Circlip-groove 44 Longitudinal slot hole
25a Circlip grooves distance 45 Located pin
25b Bottom diameter of circlip groove 46 Notch for circlip
25c Width of circlip-groove 47 Skirt scavenging gas zone
26 Pin boss draft angle 48 Skirt notch
27 Pin boss gap 49 Rib
28 Outlet of cooling gallery 50 Center hole
4.5.3 The diameter tolerance of pin-bore shall comply with the following provisions.
a) When diameter of pin-bore is greater than 18 mm, its diameter tolerance shall comply with IT5 specified by GB/T 1800.1; when diameter of pin-
bore is not greater than 18 mm, its diameter tolerance shall be IT6.
b) The diameter of piston pin-bore shall be divided into groups according to the minimum size. The groups shall be represented by 1, 2, 3, ... and
ordered from the minimum size to the maximum one. The pin-bore of
which the diameter tolerance is less than 0.01 mm shall not be divided
into groups.
4.5.4 Compression height tolerance. gasoline machining piston on crown- surface is 0.2 mm; diesel machining piston is 0.1 mm; non-gasoline machining piston on crown-surface is 0.4 mm.
4.5.5 Tolerance of ring-groove width. the width tolerance of parallel ring-groove is 0.03 mm; the width tolerance of keystone ring-groove is 0.02 mm.
4.6 Shape and position tolerance
4.6.1 Perpendicularity OF each tessellation line on both upper and lower sides of ring-groove TO skirt axis is 25. 0.07.
4.6.2 The end surface round run-out OF each tessellation line on both upper and lower sides of ring-groove TO skirt axis is 0.05 mm.
4.6.3 The flatness of lower side of ring-groove shall comply with provisions of Table 4.
Table 4 Unit. mm
Piston diameter Flatness
??? 150 0. 015
> 150 0. 025
4.6.4 Axiality OF head?€?s outer circle and outer circle of ring-land TO skirt axis is ??0.06 mm.
4.6.5 Radial round run-out OF root circle of ring-groove TO skirt axis is 0.20 mm.
4.6.6 Axiality OF inner surface axis of skirt TO skirt axis shall comply with provisions of Table 5.
Table 5 Unit. mm
Wall thickness Axiality
??? 3 ?? 0.4
>3~5 ?? 0.5
>5 ?? 0.7
4.6.7 Position of pin-bore axis to skirt axis and perpendicular to skirt axis is 0.20 mm.
4.6.8 Perpendicularity of pin-bore axis to skirt axis is 100. 0.035.
4.6.9 Cylindricity of pin-bore shall comply with provisions of Table 6. Table 6 Unit. mm
Pin-bore diameter Cylindricity
??? 18 0.0035 0.005a
>18 0.0050 0.008a
a In case of intermittent cutting in processing on the circumferential surface of the pin-bore due to decompression chamber and oil hole, it shall adopt this value.
4.6.10 Straightness of pin-bore axis is ??0.006???Mmm.
4.6.11 Round run-out of root circle of circlip-groove to pin-bore axis is 0.30 mm. 4.6.12 When skirt is oval, the longitudinal axis of oval shall be perpendicular to the pin-bore axis. Its maximum offset shall comply with provisions of Table 7. Table 7
Piston diameter / mm Offset
???150 ??? 5??
>150 ??? 3??
4.7 Roughness parameters of machining surface
4.7.1 Outer circle surface. Ra is 1 ??m~5 ??m.
4.7.2 Pin-bore surface. Ra shall not be greater than 0.63 ??m.
4.7.3 Upper and lower sides of ring-groove. Ra shall not be greater than 0.63 ??m; upper and lower sides of wear-resistant ring carrier shall not be greater than 1.25 ??m.
4.7.4 Root circle surface of ring-groove. Ra shall not be greater than 0.63 ??m. 4.7.5 Other machining surface. follow the provisions of product drawings. 4.8 Appearance quality
4.8.1 Casting surface of piston shall be flawless and 1 mm higher than parting boundary line. Cracks and flashes are not allowed.
4.8.2 Defects of machining surface shall comply with the following provisions. a) Cracks and burrs on all machining surfaces of piston are not allowed. b) Any visible eyelet on two sections of pin-bore surfaces, i.e., within the range from inner end to 1/4 of the total length of the whole section, and circlip-groove. Eyelets of other parts on each section shall comply with provisions of Table 8. Meanwhile, less than 10 slight shrinkages of which the diameter is ???0.3 mm are allowed to exit in 1 cm2 area.
Table 8
Pin-bore diameter
/ mm
Max diameter of
eyelet / mm Eyelet depth / mm
Eyelet quantity /
pcs
???18 1.0 ???1.0 ???1
>18 1.5 ???1.0 ???1
c) Eyelets are allowed to exist on the outer surface of skirt according to provisions of Table 9. The spacing between eyelets must not be less than 15 mm nor 5 mm from the edge. Meanwhile, less than 10 slight shrinkages of which the diameter is ???0.3 mm are allowed to exist in 1 cm2 area.
Table 9
Skirt wall
thickness / mm
Max diameter of
eyelet / mm
Eyelet depth /
mm
Eyelet quantity /
pcs
???3 1.0 ???0.5 ???3
>3 1.5...

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