This standard specifies the structural type, technical requirements, inspection rules and marking, packaging, transportation and storage of integral single-layer connecting rod bushings for internal combustion engines. This standard applies to integral single-layer connecting rod bushings for tractors, automobiles, engineering machinery, ships and fixed reciprocating piston internal combustion engines with a cylinder diameter of less than 200mm. This standard does not apply to rolled connecting rod bushings for internal combustion engines. JB/T 7292.1-1994 Technical conditions for connecting rod bushings for internal combustion engines JB/T7292.1-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7292.1-94
Internal Combustion Engine Bushing
Technical Conditions for Connecting Rod Bushing
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Internal Combustion Engine Bushing
Technical Conditions for Connecting Rod Bushing
Subject Content and Applicable Scope
JB/T7292.1-94
This standard specifies the structural type, technical requirements, inspection rules and marking, packaging, transportation and storage of integral single-layer connected sample bushings for internal combustion engines. This standard applies to integral single-layer connecting rod bushings (hereinafter referred to as connecting rod bushings) of tractors, automobiles, engineering machinery, ships and enclosed reciprocating piston internal combustion engines with a cylinder diameter of less than 200mm for use. This standard does not apply to rolled connecting rod bushings for internal combustion engines. 2 Referenced standards
GB1184
GB1800
GB2828
GB10448
GB10452
3 Structural types
Shape and position tolerances Specifications for tolerances not specified Tolerances and fits General Standard tolerances and basic deviations Batch inspection Count sampling procedures and sampling tables (applicable to inspection of continuous batches) Sliding bearings Steel alloys for single-layer and multi-layer bearings Sliding bearings for single-layer bearings Antifriction alloys Hardness test methods The typical structural type of connecting rod bushings is shown in Figure 1. Figure 1
4 Technical requirements
4.1 Connecting rod bushings shall be manufactured in accordance with product drawings and technical documents approved through the prescribed procedures and shall comply with the provisions of this standard. 4.2 Materials
4.2.1 The material of connecting rod bushings shall be the cast copper-based alloy specified in GB10448. Approved by the Ministry of Machinery Industry on July 18, 1994
Implementation on July 1, 1995
JB/T7292.194
The grades, chemical compositions, metallographic structures and mechanical properties of the above materials are shown in Appendix A (Supplement). 4.2.2 Other cast pin-based alloys that meet the quality requirements may also be used. 4.3 The hardness difference of the same type of connecting rod bushings made of the same material shall not exceed 30 Brinell hardness units. 4.4 Dimensions and tolerances
4.4.1 The outer circle dimension tolerance grade of the connecting rod bushing shall not be lower than 1T7 specified in GB1800. 4.4.2 The inner circle dimension tolerance grade of the connecting rod bushing shall not be lower than 1T6 specified in GB1800. The inner circle dimension tolerance grade of the connecting rod bushing with boring or reaming amount shall be agreed upon by the supply and demand parties.
4.4.3 The tolerance of the width B of the connecting rod bushing shall be as specified in Table 1. Table 1
Width B
>25~50
> 50~80
>80~120
4.4.4 Inner and outer chamfer dimensions
The inner and outer chamfer lengths cl and c of the connecting rod bushing should preferably be 0.3.0.5.0.8.1.0.2.0mml. 4.4.5 Inner and outer chamfer angles
4.4.5.1 The outer chamfer angle α of the connecting rod bushing is generally 45°, and 15° can also be used. 4.4.5.2 The inner chamfer angle % of the connecting rod bushing is 45°4.5 Shape and position tolerances
4.5.1 Shape tolerance
The cylindrical tolerance grade of the inner circle of the connecting rod bushing should not be lower than Grade 6 specified in GB1184. The tolerance grade of the inner circle cylindricality of the measured or measured shall be agreed upon by the supply and demand parties.
4.5.2 Position tolerance
4.5.2.1 The coaxiality tolerance grade of the inner and outer axis of the connecting rod bushing shall not be lower than Grade 8 specified in GB1184. 4.5.2.2 The coaxiality tolerance grade of the inner and outer axis of the connecting rod bushing with boring or reamed allowance shall not be lower than Grade 9 specified in GB1184. 4.6 Surface roughness
4.6.1 The outer surface roughness R of the connecting rod bushing is 0.8μm. 4.6.2 The surface roughness R of the inner ring of the connecting rod bushing is 0.63μm. 4.6.3 The inner circle surface roughness R of the connecting rod bushing with measured or reamed allowance is 3.2μm. 4.7 The inner and outer surfaces of the connecting rod bushing are not allowed to have defects such as burrs, scratches, bumps and crushing. 4.8 The inner and outer surfaces of the connecting rod bushing are not allowed to have casting defects such as cracks, pinholes and slag inclusions, but the outer surface is allowed to have 2 and the inner surface is allowed to have 1 smooth air hole with a diameter not greater than 1mm and a depth not greater than 0.5mm. 4.9 If the user complies with the installation, maintenance and use rules specified in the instruction manual of the internal combustion engine, the warranty period of the connecting rod bushing shall not be less than the warranty period of the internal combustion engine.
5 Inspection rules
Inspection categories
Regular inspection:
Warehousing inspection:
Delivery acceptance.
5.2 Inspection items
Overall dimensions:
Geometric accuracy:
Surface roughness;
Physical and chemical properties:
Appearance quality:
Marking, packaging.
5.3 Sampling method
JB/T 7292. 1 --94
According to the sampling inspection rules specified in GB2828, 5.4 Inspection method
The hardness inspection method of connecting rod bushing shall be in accordance with the provisions of GB10452, see Table 2. Table 2
Base and aluminum-based alloy strains and pipes
Inspection conditions
Preferred period HB2.5/6Z.>/1. If the inspection area is too small, Hs1/10/10 can also be used
For special alloys with a relatively high sand limit, HB5/250/10 is used for inspection temperature
Note: The hardness of HB5/250/10 bearing belt should be obtained by using a ball with a diameter of 5rm and a load of 2.45kN. If the load time is 1G. 6 Marking, packaging, transportation and storage
6.1 Marking
The outer surface of the packaging box should be marked with:
Manufacturer name, factory logo and address:
Product name, model or size code:
Quantity:
Packing date (year, month).
The outer surface of the packaging box should be marked with:
Manufacturer name and address;
Product name and model:
Total weight and quantity;
Consignee and address:
"Handle with care", "Moisture-proof" and "Pressure-proof" and other words and signs; Packaging date (year, month),
6.2 Packaging
Each connecting rod bushing should be kept clean before packaging. It should be oil-sealed or subjected to other anti-corrosion treatments before being packed into the packaging box. 6.2.2 Each packing box should be accompanied by a product certificate signed by the inspector of the quality inspection department of the manufacturer. 6.3 Transportation
The packing box must be placed in a dry packing box. The total weight of each packing box should not exceed 25kg. It must be guaranteed not to be damaged during normal transportation.
6.4 Storage
The packaged connecting rod bushing should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer shall ensure that the connecting rod bushing will not rust within 12 months from the date of white packaging. A1
Material grade, chemical composition
A1.1 Alloy grade
JB/T7292.1-94
Appendix A
Connecting rod bushing material
(Supplement)
CuSn12Pb2, CuPb5Sn5Zn5.CuPb10Sn10, CuPb15Sn8 and other molybdenum-based alloys A1.2 Chemical composition
The chemical composition of the alloy shall be in accordance with the provisions of Table A1. Table A1
Alloy elements
Note 1) Contains Ni.
CuSn12Pb2
11.0~13.0
0. 05~0. 40 2
CuPb5Sn5Zn5
Yu Xie"
2) For continuous casting, the phosphorus content can be increased to 1.5 after consultation. Composition
3) The chemical element content of this alloy is different from that of the thin-walled multi-layer alloy. 4) The phosphorus content can be determined after consultation.
A2 Material hardness
A2.1CuSn12Pb2 alloy hardness is greater than or equal to 80HBSA2.2CuPb5Sn5Zn5 alloy hardness is greater than or equal to 60HBS. A2.3CuPb10Sn10 alloy hardness is greater than or equal to 65HB A2.4CuPb15Sn8 alloy hardness is greater than or equal to 60HBS, A3 Material metallographic structurebzxz.net
The metallographic structure of the material shall comply with the requirements of the corresponding standards. 4
CuPb10Sn10
Residue\
CuPb15Sn8
Residue"
13.0~17.0
Additional instructions:
JB/T7292.1-94
This standard was proposed and managed by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Internal Combustion Engine Research Institute. The main drafters of this standard are Bao Xidi and Xu Liming. From the date of implementation of this standard, NJ19-85 "Technical Conditions for Connecting Rod Bushings" will be invalid.
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