GB/T 2940-2025 Springs for fuel pump, governor and injector of diesel engines—Technical specification English, Anglais, Englisch, Inglés, えいご
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ICS 21.160 CCS J26
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 2940-2025 Replaces GB/T 2940-2005
SPRINGS FOR FUEL PUMP, GOVERNOR AND INJECTOR OF DIESEL ENGINES—TECHNICAL SPECIFICATION
Issued on August 29, 2025
Implemented on August 29, 2025
Issued by State Administration for Market Regulation
Standardization Administration of China
Contents
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols, Units and Parameter Names
5 Spring Nomenclature, Diagrams and Structural Types
6 Technical Requirements
6.1 Materials
6.2 Spring Characteristics
6.3 Outer/Inner Diameter Tolerance
6.4 Free Length Tolerance
6.5 Perpendicularity
6.6 End Grinding
6.7 Hooks for Tension Springs
6.8 Arms for Torsion Springs
6.9 Chamfering
6.10 Shot Peening
6.11 Permanent Deformation
6.12 Relaxation
6.13 Fatigue
6.14 Residual Magnetism
6.15 Cleanliness
6.16 Surface Treatment
7 Test Methods
7.1 Spring Characteristics
7.2 Outer/Inner Diameter
7.3 Free Length
7.4 Perpendicularity
7.5 End Grinding
7.6 Hooks for Tension Springs
7.7 Arms for Torsion Springs
7.8 Shot Peening
7.9 Permanent Deformation
7.10 Relaxation Test
7.11 Fatigue Test
7.12 Residual Magnetism
7.13 Cleanliness Test
7.14 Surface Quality
8 Inspection Rules
8.1 Sampling Inspection
8.2 Defect Classification
9 Marking, Packaging, Transportation and Storage
9.1 Marking
9.2 Packaging
9.3 Transportation
9.4 Storage
Appendix A (Informative) Typical Working Drawings of Springs
1 Scope
This document specifies the technical requirements for cylindrical helical springs used in diesel engine fuel pumps, governors, and injectors, and describes corresponding test methods and inspection rules.
This document applies to cold-formed cylindrical helical springs with circular cross-sections for:
Plunger springs and discharge valve springs in fuel pumps
Governor springs
Pressure regulating springs in injectors
Springs for electronic common rail systems
Other cold-formed cylindrical helical springs with non-circular cross-sections may refer to this document.
2 Normative References
The following documents contain provisions that, through reference in this text, constitute essential clauses of this document. For dated references, only the edition cited applies; for undated references, the latest version (including amendments) applies.
GB/T 1805 Springs—Vocabulary
GB/T 4350 Cold-drawn carbon spring steel wire
GB/T 16947 Specification for fatigue testing of spiral springs
GB/T 25366 Diesel engine electronic common rail systems—Rail assembly
JB/T 7661 Cleanliness limits and test methods for diesel fuel injection equipment
3 Terms and Definitions
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.
