JB/T 7292.2-1994 Specifications for camshaft bushings for internal combustion engines
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7292.2—94
Internal Combustion Engine Bushing
Technical Conditions for Camshaft 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 Camshaft Bushing
1 Subject Content and Scope of Application
JB/T 7292.2—94
This standard specifies the structural type, technical requirements, inspection rules and marking, packaging, transportation and storage of bimetallic rolled camshaft bushings for internal combustion engines.
This standard applies to rolled camshaft bushings (hereinafter referred to as camshaft bushings) for tractors, automobiles, engineering machinery, ships and fixed reciprocating piston internal combustion engines with cylinder diameters within 200mm. Camshaft bushings for internal combustion engines made of integral single-layer materials can be implemented in accordance with JB/T7292.3. 2 Reference standards
GB2828
GB8896
GB10451
GB10453
JB3657
ZBJ92005
ZBT12 003
3 Structural type
Technical conditions for high-quality carbon structural steel
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) Aluminum-tin-20 copper-steel bimetallic plate
Sliding bearings Metallic multilayer materials for thin-walled bearings Sliding bearings Multilayer bearings Anti-friction alloy hardness test method Automobile engine bearings Tin-based and lead-based alloy metallographic standards Technical conditions for rolled connecting rod bushings for internal combustion engines
Metallographic of automobile engine bearings Steel-lead alloys
Metallographic inspection standard for copper-lead alloy bearings for internal combustion engines The typical structure and buckle type of camshaft bushings are shown in Figure 1. 8
Approved by the Ministry of Machinery Industry on July 18, 1994
Implementation on July 1, 1995
3.2 Camshaft bushings can also adopt straight seam opening type. 4 Technical requirements
JB/T7292.2—94
Camshaft bushings shall be manufactured according to product drawings and technical documents approved by the prescribed procedures and shall comply with the provisions of this standard. 4.1
4.2 Materials
4.2.1 Steel back
The steel back material shall be 08A1, 08, 10, 15 pins specified in GB699 or other materials approved by the prescribed procedures. 4.2.2 Alloys
Tin-based and lead-based alloys;
Copper-based alloys;
Aluminum-based alloys. The grades, chemical compositions, metallographic structures and mechanical properties of the above alloys are shown in Appendix A (Supplement). 4.3 Dimensions and tolerances
4.3.1 Outer diameter D
The tolerance of the outer diameter D of the camshaft bushing shall be in accordance with the provisions of Table 1. Table 1
Outer diameter D
> 50~80
>80~120
Wall thickness eT
The tolerance of the wall thickness e of the camshaft bushing shall be in accordance with the provisions of Table 2. Outer diameter D
No machining allowance for the inner ball
>50~80
>80~120
4.3.3 Length c and angle a of the outer chamfer
The length c of the outer chamfer of the camshaft bushing shall be in accordance with the provisions of Table 3. 4.3.3. 1
Outer diameter D
> 25~80
>80~120
The outer chamfer angle of the camshaft bushing shall be as follows: 4. 3. 3. 2
Tolerance of the whole thickness
Machining allowance in the inner drawing
Outer ring chamfer length
4.3.4 Inner chamfer depth c and angle a
JB/T7292.2-94
4.3.4.1 The inner chamfer depth c of the camshaft bushing shall be as specified in Table 4. Table 4
Outer diameter D
> 25~80
> 80~120
4.3.4.2 The inner chamfer angle a of the camshaft bushing should be 45*. 4.3.5, Oil hole
When the oil hole of the camshaft bushing is punched, the shaded area of Figure 2 should be avoided. Figure 2
4.3.6 Joint
Inner four-corner depth c:
4.3.6.1 When the camshaft bushing adopts the buckle type, the type, size and quantity of the buckle shall be agreed upon by the supply and demand parties. mm
4.3.6.2 When the camshaft bushing joint adopts the straight seam opening type, its radial misalignment and axial misalignment in the free state can refer to the provisions of Article 2.10.4 of ZBJ92005, and can be agreed upon by the supply and demand parties. 4.3. 6.3 When the camshaft bushing joint adopts the straight seam opening type, the inner and outer edges of the joint end face are allowed to have an angle with a radius less than 0.2mm.
4.3.7 Unspecified tolerances
For lengths and angles without specified tolerances, their limit deviations shall be as follows: length is ±0.25mm;
angle is ±5°
4.4 Surface evenness
4.4.1 Roughness of outer surface
The outer surface roughness R of the camshaft bushing shall be 1.25μm. 4.4.2 Roughness of inner surface
The inner surface roughness R of the camshaft bushing shall comply with the provisions of Table 5, 3
Surface roughness
JB/T 7292. 294
Surface coarse grain R.
No machining allowance for inner ring
4.5 The alloy layer of the camshaft bushing should be firmly bonded to the steel backing, and no peeling is allowed. The alloy layer of the camshaft bushing is not allowed to have defects such as inclusions, pores, shrinkage, etc. 4.6
4.7 For camshaft bushings with buckle type, the joints should be tight and firm, and no light should be transmitted. 4.8 The steel backing surface of the camshaft bushing is not allowed to have defects such as burrs, rust, cracks, etc. 4.9 The alloy surface of the camshaft bushing is not allowed to have defects such as Scratches, scratches and crushing are allowed. 4.10 The steel back and alloy surface of the camshaft bushing buckle are allowed to have slight indentations that do not affect the use. Domestic processing allowance
4.11 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 camshaft bushing shall not be less than the warranty period of the internal combustion engine.
5 Inspection rules
5.1 Inspection categories
Regular inspection:
b. Warehouse inspection;
e. Delivery acceptance.
5.2 Inspection items
Overall dimensions:
Geometric accuracy:
Surface roughness:
Physical and chemical properties;
Appearance quality:
f. Marking, packaging.
5.3 Sampling method
The sampling inspection and evaluation of camshaft bushing products shall be carried out by both the supply and demand parties in accordance with the sampling inspection rules specified in GB2828. 5.4 Inspection method
5.4.1 Inspection of the bonding rate between the alloy layer and the steel layer The inspection of the bonding strength between the alloy layer and the steel layer of the camshaft bushing can be carried out by instruments or destructive inspection methods. When doing destructive inspection, cut the bushing into two pieces along the diameter direction of the bushing joint, and take any one of the samples for inspection. The inspection method is as follows:
5.4.1.1 For tin-based and lead-based alloy bushings, the sample can be flattened first, and then pressed until the steel backs are attached to each other. If there is a fine velvety alloy or grayish white on the back of the pot where the alloy is broken, it means that the adhesion is good. 5.4.1.2· For copper-based alloy bushings, first flatten the specimen, then continue to flatten it to 90°, and then return to flattening. The alloy layer is allowed to have cracks, but the alloy layer is not allowed to separate from the steel backing.
5.4.1.3 For aluminum-based alloy bushings, flatten the specimen to 180°. The alloy layer is allowed to have cracks, but the alloy layer is not allowed to separate from the steel backing. 5.4.2 Hardness test of steel back and alloy
The hardness test of camshaft bushing steel back and alloy shall be in accordance with the provisions of GB10453, see Table 6.4
Pb-based, lead-based alloys
Steel-based, aluminum-based alloys
JB/T7292.2-94
Alloy layer thickness
0. 2~0. 3
> 0. 3~0. 5
> 0. 5~0. 7
> 0. 2~0. 4
Various thicknesses
Test conditions
HV 0.3/10
HV 0.5/10
HV1/10
HB5/25/180
HV 0.3/30
HB1/5/30
HB 2. 5/31.25/30
HB1/30/10
Note: ①HV0.2/10 indicates that the Brinell hardness should be obtained under a test load of 1.96N and a loading time of 10s. ②HB5/25/180 indicates that the Brinell hardness should be obtained under a test load of 245.17N and a loading time of 180s using a ball head with a diameter of 5mm. 5.4.3 Inspection of outer diameter D
The inspection of the outer diameter D of the camshaft bushing should preferably be carried out by loading inspection, and the method is shown in Figure 3. 5.4. 3. 1
5. 4.3. 2
When the outer diameter D of the camshaft bushing is inspected by loading, the inspection load F shall be in accordance with the provisions of Table 7. Continue
Each axle seal
Test moldbzxZ.net
Outer diameter D
D≥12
Test mold hole diameter D.
D.. --0.012
Test load F
3000eB/D
6000eB/D
Note, when D<12mm, the test load F value should be adjusted to the nearest multiple of 250, when D>12mm, the test load F value should be adjusted to the nearest multiple of 500.
In Table 7, D.. is the maximum outer diameter, B is the width, and e is the equivalent thickness. e is calculated by formula (1): 5
Wherein: e equivalent thickness, mm:
e-steel layer thickness, mm;
e alloy layer thickness, mm;
JB/T 7292.2~94
K--coefficient, the value range of K is as follows: gong-based, lead-based alloy K=0;
copper-based alloy K=1/2:
aluminum-based alloy K=1/3.
5.4.3.3 When the outer diameter D of the camshaft bushing is loaded for inspection, the change value △D of the outer diameter D is calculated according to formula (2): AD=2A/x
Wherein: AD
change value of the outer diameter D, mm
--the difference between the measured value h of the outer diameter D of the camshaft bushing in the inspection die and the measured value h of the standard core sample with an outer diameter of D., mm.
5.4.3.4 Inspection of the outer diameter D of the camshaft bushing may also be carried out by other methods agreed upon by the supplier and the buyer. 5.4.4 Inspection of wall thickness er
5.4.4.1 When the width B of the camshaft bushing is ≤14mm, the wall thickness e shall be inspected on the central circumference equidistant from the two end faces of the bushing, and the four points perpendicular to each other shall be measured.
5.4.4.2 When the width B of the camshaft bushing is >14mm, the wall thickness e shall be inspected on two circumferences 5mm from the two end faces of the bushing, and the four points perpendicular to each other shall be measured on each circumference. 5.4.4.3 At the specified measuring position, if there are oil holes, oil grooves, overlaps or other reasons (such as non-fitting areas), other measuring points may be selected.
Marking, packaging, transportation and storage
6.1 Marking
Each camshaft bushing shall be marked with:
Manufacturer name or factory logo;
Product model or size code.
The outer surface of the packaging box shall 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 packing 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", "Pressure-proof" and other words and signs; Packing date (year, month).
6.2 Packaging
6.2.1 Each camshaft bushing should be clean before packaging, and should be oil-sealed or treated with other anti-corrosion treatments before being packed into the packaging box. 6.2.2 Each packaging box should be accompanied by a product certificate signed by the inspector of the manufacturer's quality inspection department. 6.3 Transportation
JB/T 7292. 294
The packaging pot must be placed in a dry packaging box. The total weight of each packaging box should not exceed 25kg, and it must be guaranteed that it will not be damaged during normal transportation.
The packaged camshaft bushing should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the camshaft bushing will not rust within 12 months from the date of packaging. 7
A1 Alloy grade, chemical composition
JB/T7292.2—94|| tt||Appendix A
Camshaft Bushing Alloy
(Supplement)
A1.1Tin-based and lead-based alloys: According to the provisions of GB10451, other tin-based and lead-based alloys that meet the quality requirements may also be used. A1.2Copper-based alloys: According to the provisions of GB10451, other copper-based alloys that meet the quality requirements may also be used. Aluminum-based alloys: According to the provisions of GB10451, among which AISn20Cu according to the provisions of GB8896 may also be used. Use Al.3
Other aluminum-based alloys that meet quality requirements.
A2 Hardness
The hardness of tin-based, lead-based, and copper-based alloys shall comply with the provisions of GB10451. A2.1
A2.2 The hardness of aluminum-based alloys shall comply with the provisions of GB10451, among which AISn20Cu shall comply with the provisions of GB8896. A3 Metallographic Structure
The metallographic structure of tin-based and lead-based alloys shall comply with the provisions of JB3657, A3.1||tt t||The metallographic structure of the base alloy by casting process shall comply with the provisions of NJ355, and the metallographic structure of the copper-based alloy by powder sintering process shall comply with the provisions of ZBT12A3.2
003.
A3.3 The metallographic structure of the aluminum-based alloy shall comply with the provisions of the corresponding standards. Additional remarks:
This standard was proposed and managed by the Upstream Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Internal Combustion Engine Research Institute, and the main drafters of this standard were Bao Xidi and Xu Liming. 81 Marking
Each camshaft bushing shall be marked with:
Manufacturer name or factory mark;
Product model or size code.
The outer surface of the packaging box shall be marked with:
Manufacturer name, factory mark and address;
Product name, model or size code:
Quantity:
Packing date (year, month).
The outer surface of the packing 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", "Pressure-proof" and other words and signs; Packing date (year, month).
6.2 Packaging
6.2.1 Each camshaft bushing should be clean before packaging, and should be oil-sealed or treated with other anti-corrosion treatments before being packed into the packaging box. 6.2.2 Each packaging box should be accompanied by a product certificate signed by the inspector of the manufacturer's quality inspection department. 6.3 Transportation
JB/T 7292. 294
The packaging pot must be placed in a dry packaging box. The total weight of each packaging box should not exceed 25kg, and it must be guaranteed that it will not be damaged during normal transportation.
The packaged camshaft bushing should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the camshaft bushing will not rust within 12 months from the date of packaging. 7
A1 Alloy grade, chemical composition
JB/T7292.2—94|| tt||Appendix A
Camshaft Bushing Alloy
(Supplement)
A1.1Tin-based and lead-based alloys: According to the provisions of GB10451, other tin-based and lead-based alloys that meet the quality requirements may also be used. A1.2Copper-based alloys: According to the provisions of GB10451, other copper-based alloys that meet the quality requirements may also be used. Aluminum-based alloys: According to the provisions of GB10451, among which AISn20Cu according to the provisions of GB8896 may also be used. Use Al.3
Other aluminum-based alloys that meet quality requirements.
A2 Hardness
The hardness of tin-based, lead-based, and copper-based alloys shall comply with the provisions of GB10451. A2.1
A2.2 The hardness of aluminum-based alloys shall comply with the provisions of GB10451, among which AISn20Cu shall comply with the provisions of GB8896. A3 Metallographic Structure
The metallographic structure of tin-based and lead-based alloys shall comply with the provisions of JB3657, A3.1||tt t||The metallographic structure of the base alloy by casting process shall comply with the provisions of NJ355, and the metallographic structure of the copper-based alloy by powder sintering process shall comply with the provisions of ZBT12A3.2
003.
A3.3 The metallographic structure of the aluminum-based alloy shall comply with the provisions of the corresponding standards. Additional remarks:
This standard was proposed and managed by the Upstream Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Internal Combustion Engine Research Institute, and the main drafters of this standard were Bao Xidi and Xu Liming. 81 Marking
Each camshaft bushing shall be marked with:
Manufacturer name or factory mark;
Product model or size code.
The outer surface of the packaging box shall be marked with:
Manufacturer name, factory mark and address;
Product name, model or size code:
Quantity:
Packing date (year, month).
The outer surface of the packing 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", "Pressure-proof" and other words and signs; Packing date (year, month).
6.2 Packaging
6.2.1 Each camshaft bushing should be clean before packaging, and should be oil-sealed or treated with other anti-corrosion treatments before being packed into the packaging box. 6.2.2 Each packaging box should be accompanied by a product certificate signed by the inspector of the manufacturer's quality inspection department. 6.3 Transportation
JB/T 7292. 294
The packaging pot must be placed in a dry packaging box. The total weight of each packaging box should not exceed 25kg, and it must be guaranteed that it will not be damaged during normal transportation.
The packaged camshaft bushing should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the camshaft bushing will not rust within 12 months from the date of packaging. 7
A1 Alloy grade, chemical composition
JB/T7292.2—94|| tt||Appendix A
Camshaft Bushing Alloy
(Supplement)
A1.1Tin-based and lead-based alloys: According to the provisions of GB10451, other tin-based and lead-based alloys that meet the quality requirements may also be used. A1.2Copper-based alloys: According to the provisions of GB10451, other copper-based alloys that meet the quality requirements may also be used. Aluminum-based alloys: According to the provisions of GB10451, among which AISn20Cu according to the provisions of GB8896 may also be used. Use Al.3
Other aluminum-based alloys that meet quality requirements.
A2 Hardness
The hardness of tin-based, lead-based, and copper-based alloys shall comply with the provisions of GB10451. A2.1
A2.2 The hardness of aluminum-based alloys shall comply with the provisions of GB10451, among which AISn20Cu shall comply with the provisions of GB8896. A3 Metallographic Structure
The metallographic structure of tin-based and lead-based alloys shall comply with the provisions of JB3657, A3.1||tt t||The metallographic structure of the base alloy by casting process shall comply with the provisions of NJ355, and the metallographic structure of the copper-based alloy by powder sintering process shall comply with the provisions of ZBT12A3.2
003.
A3.3 The metallographic structure of the aluminum-based alloy shall comply with the provisions of the corresponding standards. Additional remarks:
This standard was proposed and managed by the Upstream Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Internal Combustion Engine Research Institute, and the main drafters of this standard were Bao Xidi and Xu Liming. 8
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