JB/T 9750.1-1999 This standard is a revision of NJ 406-86 "Technical Conditions for Valve Rocker Arms of Internal Combustion Engines". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage of valve rocker arms for internal combustion engines. This standard applies to valve rocker arms for reciprocating internal combustion engines with a cylinder diameter of less than or equal to 200mm. This standard was first issued in 1986. JB/T 9750.1-1999 Technical Conditions for Valve Rocker Arms of Internal Combustion Engines JB/T9750.1-1999 Standard download decompression password: www.bzxz.net

1C5 24.020
Machinery Industry Standard of the People's Republic of China
JB/T9750.1-199
Internal Combustion Engines
Valve Rocker Arms
Technical Conditions
JInternal Combustion Engincs-Rockrocker Arms--Specifications1999-09-17 Issued
National Machinery Industry Bureau
200-01-0 Implementation
JB-T9750.1—1999
This standard is a revision of N406-Internal Combustion Engine Valve Push Arms·Technical Parts. The original standard was slightly modified during the revision, and the main technical content remained unchanged.
The standard will replace NJ406-86 from the date of implementation. This standard is proposed and approved by the Technical Committee for Standardization of Internal Combustion Engines of the People's Republic of China. The originator of this standard is: F. Hai Internal Combustion Engine Research Institute. The main drafter of this standard is: Li Shaohuo. This standard was first issued in 19.
Engine Industry Standard of the People's Republic of China
Technical Conditions for Internal Combustion Engines and Valve Rocker Arms
Internal Combustion Engines-RockerramsSpecificatias1 Scope
JB/T 975U.t-1999
SpecificationsNU4U6Sh
This standard specifies the technical requirements, inspection, testing and marking of internal combustion engine rocker arms (hereinafter referred to as rocker arms), free installation, transportation and storage.
This standard applies to valve rocker arms for reciprocating or internal combustion engines with a rocker diameter of less than or equal to 200mm. 2 Reference Standards
The following standards contain provisions that constitute the provisions of the standard through reference in this standard, and the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest version of the standard. GB/T 197—1981
GB/T 699—1988
GB/T 1184[996www.bzxz.net
GB/T1348—1988
GB/T1801—1979
GB/T2828—1987
GB/T3037—1988
3 Technical requirements
General tolerances and fits [diameter 1~155mm] High-quality carbon structural steel technical conditions
Shape and position tolerances without tolerance values
Ball castings
Tolerances and fits to 500mm holes, shaft tolerance zones and fits Batch-by-batch inspection counting sampling procedures and sampling tables (applicable to the following batches of inspection alloy structural steel technical conditions
3.! The control arm should be a product approved by the prescribed procedures 3.1 The materials of the steel pipes shall be 45 steel specified in GA/699[988], 20C steel specified in G8/T307?-1983, ductile iron QT600-3 specified in OB.T1348-108, alloy steel or other materials with performance not inferior to the above grades. 3.3 The steel head surface shall be subjected to annealing or carbon quenching (alloy steel ductile iron shall be subjected to chilling). The hardness and carburization of the steel shall meet the requirements specified in the specification.
3.3.1 The hardness of 45 steel is 50-57HRC, the depth of the quenching layer is 0.6-4mm, 3.3.2 The hardness of 20Cr steel is 55-64HRC, the depth of the micro-carbon layer is 0.6~1.2mm, 3.3. 3. Ductile iron QT600-3, its hardness is 47-57HRC, hardness of hardened layer is 1.5-3mm. 3.3.4 Alloy iron hardness should be greater than or equal to 321RC, hardened layer depth should be greater than 2mm [fill the entire head], 3.4 The surface of forged rocker arm shall not be cracked, folded, disassembled, scarred, scale and defects caused by metal powder filling the forging die.
3. The unprocessed surface of the cast iron fiber shall not be allowed to have defects such as shrinkage cavities, looseness, air washing, number lines and solid slag. 3.6 The surface roughness R value of the rocker wall at each stage shall be less than or equal to the following values: National Machinery Industry Standard 1999-09-17 Approved 2000-01-01 Implementation
Arm head cylinder.8m;
b) Hole m
c) Rocker adjustment screw hole 5μm
JB/T 9750.11999
3.7 According to the hole size tolerance according to GB, T180[-1979 specified in the HT grade reverse. 3.8 The dimension tolerance of the rocker arm adjustment needle shall be manufactured according to the 6H grade specified in GB/T197-1981: 3.9 The flatness tolerance of the head cylinder line to the center line of the rocker arm shall be less than or equal to the 9 grade specified in Table B3 of GB/T1184-196 3.10 The verticality tolerance of the rocker arm adjustment screw hole to the center line of the screw hole shall not be greater than the 11 grade specified in Table B3 of GB/T1184-1996 3.11 The surface of the lifting arm shall not be rusted.
3.11 During the warranty period of the internal combustion engine, the manufacturer shall replace the damaged parts free of charge if they are caused by poor manufacturing. 4 Inspection rules
4.1 Each part shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory 4.1 When the ordering unit conducts the quality inspection, the sampling force specified in GB/T2828-1987 shall be used, and the general inspection level shall be 1.
5 Marking, packaging, transportation and storage
5.1 Each rocker arm shall be marked with the factory logo.
5.2 The rocker arms shall be cleaned and oil-sealed or treated with other anti-corrosion treatments before packaging, and then wrapped with strong and impermeable neutral paper or plastic, and then packed in a cardboard tray. Each cardboard box shall be filled with rocker arms of the same model. The carton should be marked with: manufacturer name, factory logo and address: internal combustion engine model, component name and part number: c) packaging return date (year, month 1
5.3 The cartons packed in cartons should be packed in a dry packaging box with waterproof rats, and ensure that they will not be damaged during normal transportation. The total weight of the box shall not exceed 5kg.
5.4 A packing list signed by the manufacturer's inspector and packer should be attached to the new packaging and paper tray. The list should indicate the internal combustion engine model, component name, part number and number of trays.
5.5 Each The product quality certificate with the inspector's signature is placed in the paper tray. The certificate should indicate: a) manufacturer name, factory mark and address b) internal combustion engine model and part name c) inspection date (year, month 5.6 The outer surface of the packaging box should be marked with: e) manufacturer name, factory mark and address b) internal combustion engine model and part name e) packing date, gross weight and number e) receiving unit and address e) "handle with care" and "moisture-proof". 5. The product should be stored in a suitable and dry warehouse. Under the condition of proper storage, the manufacturer should ensure that the product will not rust within 12 months from the time it leaves the factory.
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