JB/T 9760-1999 This standard is a revision of ZB J92 001-87 "Technical Conditions for Full-Circle Main Bearings of Internal Combustion Engines". During the revision, only editorial modifications were made according to relevant regulations, and the main technology remained unchanged. This standard specifies the code, technical requirements, inspection rules and markings for the main bearings of internal combustion engines. This standard applies to full-circle main bearings of reciprocating internal combustion engines with a cylinder diameter of less than 200mm. The bearing is composed of a bearing body and a thrust ring, or is stamped from the same bimetallic material. All products within the above range (except for special design requirements) must comply with the provisions of this standard. This standard was first issued in 1987. JB/T 9760-1999 Technical Conditions for Full-Circle Main Bearings of Internal Combustion Engines JB/T9760-1999 Standard download decompression password: www.bzxz.net

JB/T9760—1999
This standard is a revision of ZBJ92001-87 "Technical Conditions for Full-circle Main Bearings of Internal Combustion Engines". Editorial modifications were made to the original standard during the revision, and the main technical content remained unchanged. This standard replaces ZBJ92001--87 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard was proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. The drafting unit of this standard: Shanghai Internal Combustion Engine Research Institute. The main drafter of this standard: Bao Xidi.
This standard was first issued in 1987.
1 Scope
Machinery Industry Standard of the People's Republic of China
Internal combustion engines
Full circle main bearings
Technical conditions
Internal combustion engines Crank shaft bearingsSpecifications
This standard specifies the code, technical requirements, inspection specifications and markings of main bearings of internal combustion engines JB.T 9760 1999
This standard is applicable to full-circle main bearings of reciprocating internal combustion engines with a cylinder diameter of less than 200mm (hereinafter referred to as bearings). The bearings are produced within the above specifications (except for special designs where the bearing body and thrust ring are combined or made of bimetallic materials with the same requirements) and must comply with the provisions of this standard.
2 Referenced standards
The following standards contain the following provisions: When this standard is published, all versions are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest version of the following standards before using it. (3/T69) 1999) High-quality carbon structural steel T2800.: 1998 Limits and fits
Basis Part 1: Standard standard US rent basic deviation value table 82 1958 1980
GR/T 2828
JBAT9749
3 Name and code
Shape and position case
Given the measuring room
Batch inspection sampling sequence and sampling table (applicable to continuous batch inspection) Internal combustion engine, casting copper lead platform metal shaft company.
Metallographic inspection
Name and code see table! And figure! ,
Bearing body
Thrust ring
Inner side of positive thrust ring
Outer surface
Inheritance alloy layer thickness
Auxiliary bearing wall friction
Approved by State Machinery Industry Bureau on September 17, 1999
Thrust ring thickness
Thrust ring alloy layer thickness
Outer side of positive thrust ring
Inner circle surface
Dismantling price
2000.01-01 Implementation
Technical requirements
JB/T 9760—1999
4.1 Products should be manufactured according to drawings and technical documents approved through prescribed procedures. 4.2 Materials
4.2.1 Steel layer
4.2.1.1 The steel layer material shall be 08A1, 08, 10, 15 steel specified in GB/T699-1999 or other materials approved by the prescribed procedures.
4.2.1.2 The hardness of the steel layer shall be 160~220HB. 4.2.2 Bearing body alloy and thrust ring alloy: a) Babbitt alloy;
b) Copper-based alloy;
c) Aluminum-based alloy.
For the grades, chemical composition, metallographic structure and mechanical properties of the above bearing body alloy and thrust ring alloy, see Appendix A (Standard Appendix). 4.3 Dimensions and tolerances
4.3.1 Wall thickness tolerance
The wall thickness tolerance of the bearing body on the same cross section shall not be greater than that specified in Table 2. Table 2
Bearing body alloy
Babbitt alloy
Copper-based alloy
Aluminum-based alloy
4.3.2 Thickness of alloy layer
Wall thickness tolerance
Boring allowance
The thickness of the alloy layer of the bearing body shall be in accordance with the provisions of Table 3. Within 5mm from the joint, the thickness of the alloy layer shall not be less than 0.20mm. 4.3.2.1
Bearing body alloy
Babbitt alloy
Copper-based alloy
Aluminum-based alloy
0.25~0.60
0.30~0.70
0.30~0.80
Friction degree of alloy layer
0. 25 ~~0. 90
0.30~~1.00
JBT 9760 1999
4.3.2.2 The thickness of the alloy of the positive push ring shall not be less than 1.4.3.3bzxz.net
Alloy thickness standard
The maximum and minimum values ​​of the thickness of the alloy layer of the same bearing body (excluding the joint range) shall not be greater than the specified surface
body?
Huji Joint Department
4.3.4 Bearing outer and inner diameter, installation month
4.3.5 Auxiliary bearing inner diameter limited to inner diameter, old
4.3.6 Shaft outer diameter same degree public welfare under the large wide table: electric 4.4 bearing table for machine m1
4.4.1 Outer diameter table relative degree table: value quality does not reach 84.4.2 Inner diameter general roughness R, value into a small lower than ten table ", shaft exhibition case
Bamin Joint Enterprise 4.4.3 The roughness of the push ring side should be lower than that of the outer side. The inner side of the push ring should be grade 7: the elasticity should be grade 8. 4.5 The inner surface of the push ring and the outer side should be smooth: there will be some scratches, which will cause damage. 4.6 The alloy layer and the steel layer should be finely combined without any detachment. 4.7 The bottom of the shaft and the finger ring should be firmly combined. |tt||4.8 The main pin of the steel plate shall not have any defects. There shall be no self-increase frequency. The seam shall not be transparent. The non-self-made plate shall be tin-plated. The coating thickness shall be uniform and there shall be no plating nodules. Other anti-corrosion products may be used. 4.10
The warranty period of the auxiliary bearing is 201: During the warranty period, the manufacturer shall be responsible for replacing any damaged parts. 5 Inspection rules
5.1 Inspection categories
a) Regular spot check;
b) Inventory inspection;
c) Delivery acceptance.
5.2 Inspection items
a) Dimensions;
b) Geometric accuracy;
c) Surface roughness;
d) Physical and chemical properties;
e) Appearance quality;
f) Marking and packaging.
5.3 Sampling method
JB/T 9760—1999
Sampling inspection rules formulated in GB/T2828 shall be followed. 5.4 Inspection methods
5.4.1 Hardness inspection of steel layer and alloy
The hardness inspection method of steel layer and alloy shall be in accordance with the provisions of Table 8. Table 8
Babbitt alloy
Steel-based, aluminum-based alloy
Alloy layer thickness
0. 2~~0. 3
>0. 5~0. 7
>0. 4～1
All thicknesses
Test conditions
HV1/10
HB5/25/180
HV1/5/30
HB2.5/31.25/30
HB1/30/10
1 HV0.2/10 indicates that the Vickers hardness should be obtained under a test load of 1.96 N and a loading time of 10 s. Test temperature
2HB5/25/180 indicates that the Brinell hardness should be obtained using a 5mm diameter ball head under a test load of 245.17N and a loading time of 180s. 5.4.2 External diameter inspection
In the free state, half of the sum of the maximum and minimum values ​​of the external diameter measured by a special measuring tool should be within the size range specified in the product drawing.
5.4.3 Outer circle roundness test
In the free state, the roundness error test in GB/T1958-1980 shall be used for the test. 5.4.4 The adhesion strength test between the alloy layer and the steel layer shall be mainly conducted by listening; when the bearing steel layer is tapped lightly, the sound shall be crisp and no mute shall be allowed. Instruments or destructive tests may also be used. When conducting destructive tests, the bearing body may be first processed into a steel layer with a thickness of 2.5~3mm and an alloy layer with a thickness of no more than 0.9mm, and then the thrust ring may be removed. The bearing body may then be cut into two pieces along the diameter direction, and the piece without a seam may be taken for testing. The method is as follows: 5.4.4.1 Babbitt alloy bearings: The sample may be flattened first, and then pressed until the steel layers are close to each other. If there is a fine fuzzy alloy on the steel layer at the fracture site and it is off-white, the adhesion is good. 5.4.4.2 Copper-based alloy bearings: First flatten the sample, then continue to press it to 90°, and then return to flattening. Cracks in the alloy layer are allowed, but separation of the alloy layer and the steel layer is not allowed. JBT 9760 1999
5.4.4.3 Lead-based alloy bearings: Flatten the test specimen to 180 degrees. Cracks in the alloy layer are allowed. The alloy layer is not allowed to separate from the steel layer. 6 Marking, packaging, transportation and storage
6.1 Marking
6.1.1 Each bearing shall be marked with:
a) Manufacturer’s name or trademark:
b) Product model and size code:
c) Manufacturing date (year, month),
6.1.2 The outer surface of the packaging box shall be marked with:
a) Manufacturer’s name, trademark address:
1) Product name, model and size code: () Quantity:
d) Packaging date (year, month)
6.1.3 The outer surface of the packaging box shall be marked with,
a) Manufacturing date! 1. Name and address:
h) Product name, model and size code: () Total mass and quantity:
i) Receiving unit and address;
') "Handle with care", "Anti-mixing", "Anti-friction" and other signs: Date of manufacture (year and month)
6.2 Packaging
6.2.1 Each bearing must be cleaned and treated with corrosion protection before installation, and then packed with strong and impermeable packaging materials and then packed into the packaging box.
6.2.2 Each packaging box should be accompanied by a product certificate signed by the inspector of the manufacturing quality inspection department. 6.3 Transportation
The packaging box must be placed in a dry packaging box. The weight of each packaging box should not exceed 3k·and it must be guaranteed that it will not be damaged during normal transportation:
The packaged bearings should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the bearings are 12 pieces from the time of shipment! The inside will not rust.
JB/T9760-1999
Appendix A
(Appendix of the standard)
Bearing alloy
A1 Grade and chemical composition of bearing body alloy and thrust ring alloyA1.1 Babbitt alloy: ChSnSb4-4, ChSnSb8-4, ChSnSb11-6 tin-based alloy (but the lead content is not more than 0.35%), ChPbSb10-6 lead-based alloy or other tin-based and lead-based alloys that meet the quality requirements. A1.2 Copper-based alloy: ZQPb24-1 and ZQPb30 (but the iron content is not more than 0.7%) or other copper-based alloys that meet the quality requirements. A1.3 Aluminum-based alloy: AISn20Cu (tin content 17.5%~22.5%, copper 0.7%~1.3%, total impurities not more than 1.5%), LSb5-0.6/steel (antimony content 3.5%~5.5%, magnesium 0.3%~~0.7%, total impurities not more than 1.5%) and other aluminum-based alloys that meet quality requirements.
A2 Hardness
A2.1 Babbitt alloy is 12~30HB.
A2.2 Copper-based alloy: ZQPb24-1 is 35-~42HB; ZQPb30 is 30~36HB. A2.3 Aluminum-based alloy: AISn20Cu is 25~40HB; LSb5-0.6/steel is 2232HB. A3 Metallographic Structure
A3.1 The metallographic inspection standards of Babbitt alloy, copper-based alloy and aluminum-based alloy shall comply with the relevant standards. A3.2 The metallographic inspection standards of copper-based alloys in casting process shall comply with the provisions of JB/T9749. 420
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