JB/T 9750.2-1999 This standard is a revision of NJ 389-86 "Technical Conditions for Valve Rocker Shafts 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 shafts for internal combustion engines. This standard applies to valve rocker shafts 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 9750.2-1999 Technical Conditions for Valve Rocker Shafts of Internal Combustion Engines JB/T9750.2-1999 Standard download decompression password: www.bzxz.net

1C527.020
Machinery Industry Standard of the People's Republic of China
JB/T9750.2—1999
Internal combustion engines
Valve rocker arm shafts-Specifications1999-09-17 Issued
National Machinery Industry Bureau
2000-01-01 Implementation
JB/T9750.2-1999
This standard amends N389-86 "Technical Specifications for Valve Rocker Arm Shafts for Diesel Engines": Only minor changes have been made to the standard, and the main technical contents have not changed. This standard will replace N89-86 from the date of implementation.
This standard is the work of the National Internal Combustion Engine Standardization Technical Committee of the People's Republic of China. The drafting unit of this standard is Shanghai Internal Combustion Engine Research Institute. The main drafter of this standard is Li Shaozhuang.
This standard was first revised and issued in 19.
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Valve Rocker Shafts of Internal Combustion Engineswww.bzxz.net
Internalzuinbustiop engined
Rocker-arn shats-SpecifientionsJH9750.2-1904
1 NJ 389.Xt
This standard specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and purchase of valve shafts for internal combustion engines. The standard is applicable to valve shafts for modern compound internal combustion engines with a diameter of less than 100 mm or equal to 200 mm (hereinafter referred to as valve shafts: 2 Referenced standards
The texts contained in the following standards constitute the provisions of this standard by reference in this standard. At the time of publication of this standard, all legal versions are valid. All standards will be revised, and parties using non-standard standards should discuss the possibility of using the latest version of the following standards. GR:T69--J9R8
GB.T 11841996
GB/T1800.1—1995
GB/T2828—1987
3 Technical requirements for drawing
Technical conditions for high-quality shrink-wrapped steel
Shape and position tolerances without specified limits and basis of fit Part 3: Standard tolerances Basic deviations Numerical tables Batch inspection Counting sampling procedures and sampling tables (applicable to inspection of selected batches! 3.1 According to the business impact, the product drawings and technical documents approved in the prescribed order are prepared according to the production process. 3.2 The shaft material shall be 15, 20, 45 steel specified in GB/1699-1988, or other materials with performance not lower than the above grades.
3.3 Standard steel inserts (in combination with steel linings) shall be subjected to quenching or carburizing, and their hardness, carbonization and rate hardness shall meet the specified requirements.
3.3.115, 20 hardness is 58-64HRC, penetration layer depth is 0.8-1.2mT3.3.245 hardness is 5-57HRC, body hardness depth is 1~3mm, 3. 3.3 The hardness difference of each point on the same shaft shall not exceed 10-5 1IRC units. 3.4 The surface torsion value of the shaft (the part that matches the arm) shall not exceed 0.8m:3.5 The outer diameter tolerance of the shaft shall not exceed the IT level specified in Table 1 of GB/1800.3-1998. 3.6 The straightness tolerance of the shaft shall not be less than the level 9 specified in Table B of GB/T1184-1996. 3. If the shaft is damaged due to poor manufacturing during the warranty period of the internal combustion engine, it shall not be replaced. 4 Inspection Inspection rules
4.1 Each shaft must be inspected and qualified by the quality inspection department of the manufacturer before it can leave the factory. 4.2 The quality of the shafts in the order unit shall be recorded according to the one-time sampling/case specified in GB/F2828-1937, and the general inspection level and qualified quality packaging level AQL value are 1.0. Approved by the State Administration of Machinery Industry on September 17, 1999, 000-1-01 for implementation
5 Marking, packaging, transportation and storage
J9/T9750.2-1999
5.! Each rocker shaft should be marked with the factory logo. The logo should be made on the part of the shaft that does not match the engine. 52 Each rocker shaft must be cleaned and oil-sealed or treated with other anti-corrosion treatments before packaging, and wrapped with water-proof neutral paper or plastic film and then packed in a cardboard box. Each cardboard box should contain rocker shafts of the same model. The cardboard box should be marked with: a) manufacturer name, factory logo and address; b) internal combustion engine model, parts name and part number; 3) packaging date.
53 The rocker shafts wrapped in cardboard boxes are then packed into dry packaging boxes with waterproof paper, and it is ensured that they will not be damaged during normal transportation. The total weight of the model shall not exceed 50kg
5.1 A packing list signed and stamped by the manufacturer's inspector and packer should be attached to the packaging box and paper tray. The list should be 5.5 Each carton should be accompanied by a product quality certificate with the inspection seal, and the certificate should indicate the manufacturer's name, factory logo and address; b) Internal combustion engine model and component name:
e) Inspection time,
5.6 The outside of the carton should indicate:
a) Manufacturer's name, factory logo and address: b) Internal combustion engine model and component name:
) Installation date, quantity and quantity:
d) Receiving unit and address:
) "Handle with care", "Prevent" and other words The rocker shaft should be stored in a ventilated and safe warehouse. Under normal storage conditions, Kezao Guang guarantees that the rocker shaft will not rust within 1 month from the date of leaving the factory.
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