Internal combustion engines — Timing gears — Specifications
1 Scope
This standard specifies the terms and definitions, symbols, technical requirements, test methods, inspection rules, marking, packaging, transport and storage of crankshaft, camshaft, valve and oil supply mechanism and other finished gears of internal combustion engine.
This standard is applicable to the timing gears of reciprocating internal combustion engines with cylinder diameters less than or equal to 200 mm, as well as oil pump transmission gears, compressor pump gears, power steering pump gears and idler gears of reciprocating internal combustion engines with cylinder diameters less than or equal to 200 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendment) applies.
GB/T 191 Packaging — Pictorial marking for handling of goods
GB/T 230.1 Metallic materials — Rockwell hardness test — Part 1: Test method (Scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic materials — Brinell hardness test — Part 1: Test method
GB/T 699 Quality carbon structure steels
GB/T 1095 Square and rectangular keyways
GB/T 1184-1996 Geometrical tolerancing — Geometrical tolerances for features without individual tolerance indications
GB/T 1348 Spheroidal graphite iron castings
GB/T 2828.1 Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3077 Alloy structure steels
GB/T 3480 Calculation methods of load capacity for involute cylindrical gears
GB/T 3785.1 Electroacoustics — Sound level meters — Part 1: Specifications
GB/T 3821 Small and medium power internal combustion engines - Cleanliness limits and measurements
GB/T 4340.1 Metallic materials — Vickers hardness test — Part 1: Test method
GB/T 5216 Structural steels with specified hardenability bands
GB/T 6394 Metal-methods for estimating the average grain size
GB/T 7232 Terminology of metal heat treatment
JB/T 9439 Grey iron castings
GB/T 10095.1~10095.2-2008 Cylindrical gears — System of accuracy
GB/T 11354-2005 Determination of nitrided case depth and metallographic microstructure examination for steel and iron parts
GB/T 13299 Steel — Determination of microstructure
GB/T 13320 Metellographic grading atlas and assessing method for steel die forgings
GB/T 17879 Gears — Surface temper etch inspection after grinding
GB/Z 18620 (all parts) Cylindrical gears — Code of inspection practice
GB/T 24733-2009 Austempered ductile iron (ADI) castings
JB/T 7516-1994 Heat treatment process of gas carburizing and its quality control
JB/T 9171 Gear flame or induction hardening process and its quality control
JB/T 9172 Gear nitriding and nitrocaburizing process and its quality control
JB/T 9173 Gear carbonitriding process and its quality control
JB/T 9204 Metallographic examination of induction hardened steel parts
JB/T 9205 Metallographic examination of peralitic graphite cast iron parts induction hardened
QC/T 262-1999 Metallographic examination of automobile carburized gear
TB/T 2247 Acceptance conditions for magnetic particle inspection of locomotive traction gear
TB/T 2248 Magnetic particle inspection method for locomotive traction gear
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 7232, GB/T 10095.1~10095.2-2008, GB/T 11354-2005, GB/T 24733-2009, QC/T 262-1999, and the following apply.
3.1
timing gear
gear that maintains a fixed phase relationship with the crankshaft of an internal combustion engine and accurately controls the opening and closing of valves and the timing of fuel injection or ignition of an internal combustion engine
3.2
cleanliness
cleanliness of parts, components and the complete machine which is expressed by the quality of impurity particles collected from specified parts by specified methods
3.3
maximum particle size
size (length × width) of the largest particles of hard impurities collected from parts, components and specified parts of the complete machine
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Technical requirements
5.1 General
5.2 Materials and heat treatment
5.3 Blank
5.4 Gear blank accuracy
5.5 Gear accuracy
5.6 Tooth thickness, common normal length, spanned sphere (cylinder) size and upper and lower deviation of timing gear
5.7 Keyway and location pinhole
5.8 Timing angular deviation
5.9 Working surface roughness and gear tooth contact pattern
5.10 Surface cracks.
5.11 Grinding burn
5.12 Noise
5.13 Cleanliness and maximum particle size
5.14 Appearance quality and timing marking
6 Test method
6.1 Material
6.2 Heat treatment
6.3 Blank
6.4 Gear blank accuracy
6.5 Gear accuracy
6.6 Tooth thickness, common normal length, spanned sphere (cylinder) size and upper and lower deviation of gear
6.7 Gear keyway or location pinhole
6.8 Timing Angle
6.9 Surface roughness and gear tooth contact pattern
6.10 Surface cracks
6.11 Surface Burns
6.12 Test method for noise of timing gear
6.13 Cleanliness and maximum particle size
6.14 Appearance quality and timing marking
7 Inspection rules
7.1 Type inspection
7.2 End-of-manufacturing inspection
7.3 Random inspection
7.4 Sampling scheme and evaluation rules
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging
8.3 Transportation
8.4 Storage
Annex A (Informative) Format of gear parameter table
A.1 Introduction
A.2 Additional explanation
Annex B (Normative) Test method for noise of timing gear
B.1 General
B.2 Position of noise measurement
B.3 Noise test method
B.4 Record content
Table 1 Common material designations of timing gears
Table 2 Heat treatment requirements for timing gears
Table 3 Noise of timing gear
Table 4 Revised values of noise of timing gear
Table 5 Classification of inspection items
Table A.1 Gear parameter table
