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GB/T 2940-2025: Springs for fuel pump, governor and injector of diesel engines - Technical specification
Status: Valid GB/T 2940: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 2940-2025 | English | 519 |
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Springs for fuel pump, governor and injector of diesel engines - Technical specification
| Valid |
GB/T 2940-2025
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| GB/T 2940-2005 | English | 289 |
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Technical specifications of springs for fuel pump, governor and injector of diesel engines
| Valid |
GB/T 2940-2005
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| GB/T 2940-1982 | English | 359 |
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Technical specification of springs for fuel pump, governor and injector of diesel engines
| Obsolete |
GB/T 2940-1982
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Basic data | Standard ID | GB/T 2940-2025 (GB/T2940-2025) | | Description (Translated English) | Springs for fuel pump, governor and injector of diesel engines - Technical specification | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J26 | | Classification of International Standard | 21.160 | | Word Count Estimation | 26,233 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2025-08-29 | | Older Standard (superseded by this standard) | GB/T 2940-2005 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 2940-2025: Springs for fuel pump, governor and injector of diesel engines - Technical specification
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2940-2025
ICS 21.160
CCSJ26
National Standard of the People's Republic of China
Replaces GB/T 2940-2005
Diesel engine fuel injection pump, speed governor,
Injector spring technical specifications
Released on August 29, 2025
Implementation on August 29, 2025
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols, units and parameter names 1
5 Spring name, schematic diagram and structure type 3
6 Technical Requirements 3
6.1 Materials 3
6.2 Spring characteristics 3
6.3 Permissible deviation of spring outer diameter or spring inner diameter 5
6.4 Permissible deviation of free length 6
6.5 Perpendicularity tolerance 6
6.6 End face grinding 7
6.7 Hook and loop for tension spring 7
6.8 Torsion arm of a torsion spring 8
6.9 Chamfer 9
6.10 Shot Peening 9
6.11 Permanent deformation 10
6.12 Relaxation 10
6.13 Fatigue 10
6.14 Remanence 10
6.15 Cleanliness 10
6.16 Surface treatment 10
7 Test Method 10
7.1 Spring characteristics 10
7.2 Spring outer diameter or spring inner diameter 11
7.3 Free length 11
7.4 Verticality11
7.5 End face grinding 12
7.6 Hook and loop of tension spring 12
7.7 Torsion arm of a torsion spring 13
7.8 Shot peening 14
7.9 Permanent deformation 14
7.10 Relaxation test 14
7.11 Fatigue test 15
7.12 Remanence 15
7.13 Cleanliness test 15
7.14 Surface Quality 15
8 Inspection Rules 15
8.1 Sampling Acceptance 15
8.2 Classification of spring defects 15
9 Marking, packaging, transportation, storage 15
9.1 Sign 15
9.2 Packaging 16
9.3 Transportation 16
9.4 Storage 16
Appendix A (Informative) Spring Typical Working Drawings 17
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting of standardization documents"
Drafting.
This document replaces GB/T 2940-2005 "Technical Specifications for Fuel Injection Pumps, Governors and Injector Springs for Diesel Engines".
Compared with.2005, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Changed the scope and added relevant provisions for electronic common rail (see Chapter 1, Chapter 1 of the.2005 edition);
--- Added symbols, units and parameter names (see Chapter 4);
--- Added spring types, names, schematics and structural types (see Chapter 5);
--- Changed the material selection (see 6.1, 4.1 of the.2005 edition);
--- Changed the spring characteristics (see 6.2, 4.2 of the.2005 edition);
--- Changed the allowable deviation of the spring outer diameter or spring inner diameter (see 6.3, 4.3 of the.2005 edition);
--- Changed the free length (see 6.4, 4.4 of the.2005 edition);
--- Deleted the requirements on "spring pitch unevenness" (see 4.5 of the.2005 edition);
--- Changed the verticality requirements (see 6.5, 4.6 of the.2005 edition);
--- Changed the requirements for end ring clearance, grinding angle, end thickness and end surface roughness in end face grinding (see 6.6,.2005 edition
4.7, 4.8, 4.9);
--- Changed the requirements for the hook and loop of the tension spring (see 6.7, 4.10, 4.11, 4.12 of the.2005 edition);
--- Changed the relevant requirements for the torsion arm of the torsion spring (see 6.8, 4.13, 4.14, 4.15, 4.16, 4.17 of the.2005 edition);
--- Added chamfer requirements (see 6.9);
--- Changed the requirements for shot peening (see 6.10, 4.21 of the.2005 edition);
--- Changed the requirements for permanent deformation of springs (see 6.11, 4.18 of the.2005 edition);
--- Deleted the requirements for non-destructive testing to adapt to current technical requirements (see 4.19 of the.2005 edition);
--- Deleted the setting or heat setting, and added the relaxation requirements (see 6.12, 4.18 and 4.20 of the.2005 edition);
--- Changed the fatigue requirements (see 6.13, 4.22 of the.2005 edition);
--- Increased the requirements for residual magnetism (see 6.14);
--- Increased cleanliness requirements (see 6.15);
--- Changed the surface treatment requirements (see 6.16, 4.23 of the.2005 edition);
--- Changed the test method for spring characteristics (see 7.1, 5.2 of the.2005 edition);
--- Changed the free length test method (see 7.3, 5.5 of the.2005 edition);
--- Changed the test method for verticality (see 7.4, 5.6 of the.2005 edition);
--- Added the test method for end ring clearance, grinding angle and end thickness in end face grinding (see 7.5);
--- Added the test method for the hook of the tension spring (see 7.6);
--- Added the test method for the torsion arm of the torsion spring (see 7.7);
--- Changed the test method for shot peening (see 7.8, 5.7 of the.2005 edition);
--- Added the test method for permanent deformation (see 7.9);
--- Added relaxation test method (see 7.10);
--- Changed the test method of fatigue test (see 7.11, 5.8 of the.2005 edition);
--- Added the test method for residual magnetism (see 7.12);
--- Added cleanliness test method (see 7.13);
--- Changed the test method for surface quality (see 7.14, 5.3 of the.2005 edition);
--- Changed the provisions on sampling acceptance of inspection rules (see 8.1, 6.4 of the.2005 edition);
--- Deleted the provisions for spring inspection items (see 6.1 of the.2005 edition);
--- Added spring defect level classification (see 8.2);
--- Changed the marking, packaging, transportation and storage (see Chapter 9, Chapter 7 of the.2005 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Spring Standardization (SAC/TC235).
This document was drafted by. Wuxi Kalenna Spring Co., Ltd., Changning Fuhong Spring Co., Ltd., Kern-Liebers (Taicang) Co., Ltd.
Co., Ltd., China Machinery Productivity Promotion Center Co., Ltd., Zhejiang Meili Technology Co., Ltd., Wuxi Zegen Spring Co., Ltd., Xi'an Yili Huada Spring Co., Ltd.
Spring Technology Co., Ltd., Zhejiang Sifang Co., Ltd., and Jiangsu Tonglue Metal Products Co., Ltd.
The main drafters of this document are. Wang Jian, Luo Shunen, Chen Shaomin, Shao Chenxi, Wang Jiangjin, Lu Peigen, Jiang Zhiming, Hao Yi, Yu Feng, Cai Linxu,
Feng Wenjie.
This document was first issued in 1982, revised for the first time in.2005, and this is the second revision.
Diesel engine fuel injection pump, speed governor,
Injector spring technical specifications
1 Scope
This document specifies the technical requirements for cylindrical coil springs used in diesel engine fuel injection pumps, speed governors, fuel injectors, etc., and describes the corresponding test methods.
Law and inspection rules.
This document applies to diesel engine fuel injection pump plunger springs and oil delivery valve springs, governor springs, injector pressure regulating springs and electronically controlled common rail
Cold-formed cylindrical helical springs with circular cross-sections are used as springs. Cold-formed cylindrical helical springs with other non-circular cross-sections are used for reference.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 1805 Spring Terminology
GB/T 2828.1 Sampling procedures for inspection by attributes Part 1.Sampling plans for batch inspection based on acceptance quality limit (AQL)
GB/T 4357 Cold drawn carbon spring steel wire
GB/T 4879 Rust-proof Packaging
GB/T 16947 Coil spring fatigue test specification
GB/T 18983 Quenched and tempered spring steel wire
GB/T 24588 Stainless spring steel wire
GB/T 25366 Common rail pipe assembly for diesel engine electronically controlled common rail system
JB/T 7661 Diesel engine oil pump nozzle product cleanliness limit and determination method
JB/T 7944 Sampling inspection of cylindrical helical springs
JB/T 10802 Technical Specification for Shot Peening of Springs
YB/T 5311 Carbon spring steel wire for important purposes
3 Terms and Definitions
The terms and definitions defined in GB/T 1805 apply to this document.
4 Symbols, units and parameter names
The symbols, units and parameter names used in this document are shown in Table 1.
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