GB/T 25361.1-2022Internal combustion engines - Piston pins - Part 1: General specifications (English PDF)

foreword

This 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.

Introduction

GB/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 requirements

1 Scope

This 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 references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document.