GB/T 25361.1-2022 English PDFUS$604.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25361.1-2022: Internal combustion engines - Piston pins - Part 1: General specifications Status: Valid GB/T 25361.1: Historical versions
Basic dataStandard ID: GB/T 25361.1-2022 (GB/T25361.1-2022)Description (Translated English): Internal combustion engines - Piston pins - Part 1: General specifications Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J92 Classification of International Standard: 27.020 Word Count Estimation: 33,334 Date of Issue: 2022-10-12 Date of Implementation: 2023-02-01 Older Standard (superseded by this standard): GB/T 25361.1-2010 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 25361.1-2022: Internal combustion engines - Piston pins - Part 1: General specifications---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Internal combustion engines - Piston pins - Part 1.General specifications ICS 27.020 CCSJ92 National Standards of People's Republic of China Replace GB/T 25361.1-2010 Piston pins for internal combustion engines - Part 1.Technical requirements (ISO 18669-1.2021, IDT) Released on 2022-10-12 2023-02-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee table of contentsPreface V Introduction VI 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 3.1 General 1 3.2 Piston pin geometry and manufacturing features 1 3.2.1 Pin Hole Type 1 3.2.2 Outer edge structure 2 3.2.3 Other features 2 4 symbols 2 5 proper nouns 3 5.1 External, internal and end features 3 5.2 Outer edge and inner chamfer structure 5 5.2.1 Chamfered outer edge structure 6 5.2.2 Double chamfer outer edge structure 6 5.2.3 Rounded outer edge structure 7 5.2.4 Chamfer positioning type outer edge structure 7 5.3 Outer edge transition zone structure 8 6 code 9 7 Piston pin code marked 9 7.1 Labeling elements and order 9 7.1.1 Mandatory elements 9 7.1.2 Additional elements 10 7.2 Annotation example 10 8 Piston pin types, dimensions and tolerances 10 8.1 Manufacturing type 10 8.2 Dimensions and tolerances 11 8.2.1 Outer diameter and geometric tolerances 11 8.2.2 Inner diameter tolerance 12 8.2.3 Length (l1) and gauge length (l5) tolerances 12 8.2.4 Outer edge profile 13 8.2.5 Internal edge profile 14 8.2.6 Taper hole size 15 8.2.7 Central skin size 17 9 Materials and heat treatment 18 9.1 Material type 18 9.2 Core hardness/core strength 19 9.3 Depth of carburizing and nitriding hardening layer 19 9.4 Surface hardness 20 9.5 Volume change 20 10 General features 21 10.1 Surface roughness 21 10.1.1 Machined surface roughness 21 10.1.2 Coating surface roughness 21 10.1.3 Surface roughness of inner hole of cold extruded and seamless cold drawn piston pin 22 10.2 Piston pin marking 22 10.3 Others 22 10.3.1 Cleanliness 22 10.3.2 Antirust 22 10.3.3 Remanence 22 10.3.4 Packaging 22 11 Quality requirements 22 11.1 Material characteristics 22 11.1.1 Decarbonization 22 11.1.2 Network cementite 22 11.1.3 Nitride layer 22 11.1.4 Grinding burns 23 11.2 Material defects 23 11.2.1 Cracks 23 11.2.2 Cold extrusion forming stripes 23 11.3 Surface defects 23 Reference 25 Figure 1 Cylindrical piston pin 4 Figure 2 Figure 1 partial view W 4 Fig. 3 Cold extrusion forming central continuous skin type piston pin 5 Fig. 4 Cold-extruded end skin-type piston pin 5 Figure 5 Tapered hole piston pin 5 Figure 6 Outer edge structure (partial view X. chamfer; partial view Y. rounded corner) 6 Figure 7 Chamfered outer edge structure (partial view X in Figure 6) 6 Fig. 8 Double-chamfered outer rib structure (partial view X in Fig. 6) 6 Figure 9 Rounded outer edge structure (Partial view Y in Figure 6) 7 Figure 10 Chamfer-positioned outer edge 7 for circular snap rings Figure 11 Figure 10 Partial View Z 8 Figure 12 Outer edge transition zone structure 1 (partial views X and Y in Figure 6) 8 Figure 13 Structure 2 of the outer edge transition zone (partial views X and Y in Figure 6) 11 Figure 14 Outer rib structure 13 Figure 15 Inner chamfer structure 15 Figure 16 Tapered hole structure 16 Figure 17 Central skin size 17 Table 1 Symbol 3 Table 2 code and description 9 Table 3 Piston pin manufacturing type 10 Table 4 Outer diameter (d1) and geometric tolerance 11 Table 5 Waviness 12 Table 6 Inner diameter tolerance and concentricity when wall thickness is a12 Table 7 Length Tolerance and End Runout 12 Table 8 End face groove and end face step of code LB piston pin 13 Table 9 Dimensions of rounded outer edges 14 Table 10 Dimensions of chamfered outer edge 14 Table 11 Inner chamfer size 15 Table 12 Taper hole angle (α) and diameter (d3) tolerance 16 Table 13 Taper hole runout tolerance (e) and taper hole inscribed table (k) 17 Table 14 Chemical composition, mechanical and physical properties 18 Table 15 Core Hardness 19 Table 16 Depth of Hardened Layer 19 Table 17 Surface hardness 20 Table 18 Change of outer diameter Δd1 20 after thermal stability test Table 19 Machining Surface Roughness 21 Table 20 Coating Surface Roughness 21 Table 21 Material Defects 23 Table 22 Surface Defects 24forewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is Part 1 of GB/T 25361 "Piston Pins of Internal Combustion Engines". GB/T 25361 has issued the following parts. --- Part 1.Technical requirements; --- Part 2.Inspection rules. This document replaces GB/T 25361.1-2010 "Piston Pins of Internal Combustion Engines Part 1.Technical Requirements", and GB/T 25361.1- Compared with.2010, except for structural adjustment and editorial changes, the main technical changes are as follows. --- Changed the scope (see Chapter 1, Chapter 1 of the.2010 edition); --- Added the terms and definitions of the leading angle of the end face of the outer edge (see 3.2.2.3); ---Changed the symbols such as end face diameter d6, end face groove depth h1, end face step height/depth h2, taper hole inscribed table k, etc. (see Table 1, Table 1 of the.2010 edition); --- Increased the partial view W of the end face groove and end face step of the cylindrical piston pin (see Figure 2); ---Changed the outer edge and inner chamfer structure (see 5.2, 4.2 of the.2010 edition); ---Changed the code and description (see Table 2, Table 2 of the.2010 edition); --- Increased the allowable waviness requirements of the outer circular surface (see Table 5); --- Changed the inner diameter tolerance and the concentricity requirements when the wall thickness is a (see Table 6, Table 5 of the.2010 edition); --- Changed the length tolerance and runout requirements (see Table 7, Table 6 of the.2010 edition); --- Added the end face groove and end face step of the code LB piston pin (see Table 8); --- Changed the size of the rounded outer edge (see Table 9, Table 7 of the.2010 edition); --- Changed the view of the tapered hole structure (see Figure 16, Figure 13 of the.2010 edition); --- Changed the machining surface roughness requirements (see 10.1.1, 9.1.1 of the.2010 edition); --- Added coating surface roughness requirements (see 10.1.2); --- Changed the requirements for material defects (see 11.2, 10.2 of the.2010 edition); --- Changed the requirements for surface defects (see 11.3, 10.3 of the.2010 edition). This document is equivalent to ISO 18669-1.2021 "Piston pins for internal combustion engines - Part 1.Technical requirements". The following editorial changes were made to this document. --- In Chapter 4, the table identification (Table 1), the title and the mention of the table are supplemented, and the order of the serial numbers of the original Table 1 to Table 21 is adjusted to Table 2~Table 22. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Internal Combustion Engine Standardization Technical Committee (SAC/TC177). This document was drafted by. Kunming Yunnei Power Co., Ltd., Zhuzhou Xianghuohu Machinery Manufacturing Co., Ltd., Anqing Yade Dibo Piston Co., Ltd., Shandong Yunnei Power Co., Ltd., Shanghai Internal Combustion Engine Research Institute Co., Ltd., Shanghai Motor Vehicle Testing and Certification Technology Co., Ltd. Technology Research Center Co., Ltd., Commercial Vehicle Technology Center of SAIC Motor Corporation Limited, Shijiazhuang King Kong Kaiyuan Power Technology Co., Ltd. Division, Anhui Jinqinglong Machinery Manufacturing Co., Ltd., Yangzhou Guanghui Auto Parts Co., Ltd., Binzhou Bohai Piston Co., Ltd., Zhejiang Huiyu Auto Auto Parts Co., Ltd. The main drafters of this document. Zhang Haifeng, Chen Liqiong, Li Huihai, Hu Xiande, Wang Hailiang, Qiao Liangliang, Wang Jianrui, Wang Ruihua, Huang Weilou, Yao Guocheng, Xu Wei, Xu Liyu, Ji Weibin, Zhang Yufeng, Zuo Yanshang, Du Xuekun, Liu Shiying, Wang Yankai, Li Yuhui. This document was first published in.2010, and this is the first revision.IntroductionGB/T 25361 aims to establish the basic and general technical specifications for piston pins of internal combustion engines and the corresponding inspection rules. Consists of two parts. --- Part 1.Technical requirements. The purpose is to establish general techniques such as terms and definitions, classifications, and structural features applicable to piston pins Require. --- Part 2.Inspection rules. The purpose is to establish the measurement conditions and characteristic measurement rules applicable to piston pins. Piston pins for internal combustion engines - Part 1.Technical requirements1 ScopeThis document specifies the basic dimensions of piston pins with a nominal outer diameter of 8 mm to 100 mm for road vehicles and other reciprocating internal combustion engines inch features. In some applications other than road vehicles, this document may be used with appropriate modifications upon agreement between the manufacturer and the customer. In addition, this document establishes nomenclature, classification of piston pin types and material descriptions in terms of mechanical properties, common characteristics and quality requirements. Application of this document may require a mutually agreed data agreement between the manufacturer and customer.2 Normative referencesThis document has no normative references.3 Terms and DefinitionsThe following terms and definitions apply to this document. 3.1 General 3.1.1 Piston pin piston pin A precision cylindrical part with a smooth, hard outer surface for connecting pistons and connecting rods. 3.2 Piston pin geometry and manufacturing features 3.2.1 Pin hole type 3.2.1.1 Cylindrical bore A pin with a straight cylindrical bore. 3.2.1.2 Central skin type centreweb Central skin type pin hole There are symmetrical cold-extruded inner holes at both ends of the pin, and a continuous skin is left in the center of the pin. NOTE. The split skin is subsequently removed, leaving a step, see Figure 3. 3.2.1.3 Tapered hole type taperedbore Both ends of the pin have conical inner holes to reduce the weight of the piston pin. 3.2.1.4 Machined machinedbore The inner hole of the pin is manufactured separately by machining. 3.2.1.5 Seamless cold drawn steel tube type seamlessdrawntube Hollow steel products that do not contain any technical seams. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25361.1-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 25361.1-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 25361.1-2022_English with my colleagues?Answer: Yes. 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