JB/T 7908-1999 JB/T 7908-1999 Technical requirements for powder metallurgy oil pump rotors for internal combustion engines JB/T7908-1999 Standard download decompression password: www.bzxz.net

ICS 77.160
Machinery Industry Standard of the People's Republic of China
JB/T79081999
Specifications for P/M oil pump rotor of the internal combustion engines
Technical conditions
Specifications for P/M oil pump rotor of the internal combustion engines1999-08-06 Issued
National Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T7908-1999
This standard is a revision of JB/T7908-95 "Technical conditions for powder metallurgy oil pump rotor of internal combustion engines". Compared with JB/T7908-95, the main technical contents of this standard have been changed as follows: 1. All contents of "unmachined rotor", i.e. rough rotor, have been removed. 1. The density of inner rotor has been increased by about 0.1g/cm2, and the density of outer rotor has been increased by about 0.2g/cm2. The original standard required the oil density to be no less than 6.4g/cm2 and 6.3g/cm2 respectively, but now both are 6.4g/cm2 (without oil), which is equivalent to an oil density of 6.48g/cm. 1. The chemical composition is clearly specified. However, the chemical composition is written in Appendix A, which is only used as a basis for production, and the product does not need to be checked. 1. Specific requirements for rotor accuracy and tolerance are added. This standard replaces JB/T7908-95 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the Technical Committee for Standardization of Powder Metallurgy Products. The drafting units of this standard: Qingdao Powder Metallurgy Plant, Laiyang Qindao Powder Metallurgy Co., Ltd. The main drafter of this standard: Zhang Qin.
This standard was first issued on February 17, 1989 as GB10427-89, and was adjusted to JB/T7908-95 Machinery Industry Standard of the People's Republic of China in April 1996
Specifications for P/M oil pump rotor of the internal combustion engines
Technical conditions
Specifications for P/M oil pump rotor of the internal combustion engines1 Scope
JB/T7908-1999
Replaces JB/T7908-95
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation, purchase and storage of powder metallurgy oil pump rotors (hereinafter referred to as rotors) for internal combustion engines. This standard is applicable to oil pumps for internal combustion engines with a working pressure not exceeding 0.5MPa. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published. The versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T223.1—1981
GB/T 223.7—1981
GB/T 223.19—1989
GB/T 5163—1998
GB/T6804—1986
GB/T 7964-1987
GB/T9097.1—1988
JB/T7905—1999
3 Technical requirements
Determination of carbon content in steel and alloys
Determination of iron content in alloys and iron powder
Methods for chemical analysis of steel and alloys
Determination of copper content by extraction spectrophotometry with neocuproine-chloroform Permeability Sintered metal materials—Determination of density Sintered metal bushings—Determination of radial impregnation strength Sintered metal materials (excluding cemented carbide) at room temperature tensile test Sintered metal materials (excluding cemented carbide)—Determination of apparent hardness Part 1: Materials with basically uniform cross-sectional hardness
Sintered metal materials (excluding cemented carbide)—Sampling 3.1 The rotor shall comply with the provisions of this standard and other relevant standards and shall be manufactured according to product drawings and technical documents approved through the prescribed procedures. The chemical composition of the rotor material is shown in Appendix A (Appendix to the standard). 3.2
The physical and mechanical properties of the rotor shall comply with the provisions of Table 1. Any one of the density and oil density test may be performed. 3.3
Table 1 Physical and Mechanical Properties
Oil Density
Tensile Strength
Radial Compression Strength
≥400
Apparent Hardness
70-120
The outer diameter of the outer rotor and the inner hole of the inner rotor shall be of Grade 8 accuracy. h8 is recommended for the outer diameter of the outer rotor; H8 is recommended for the inner hole of the inner rotor 3.5 The rotor width tolerance shall comply with the provisions of Table 2: Approved by the State Machinery Industry Bureau on August 6, 1999 and implemented on January 1, 2000
Rotor width
3.6 Upper and lower deviations of the tooth profile:
a) The upper deviation of the major and minor diameters of the inner rotor is: 0: JB/T7908—1999
Table 2 Rotor width tolerance||tt| |b) The lower deviation of the inner rotor's major and minor diameters is: - (maximum meshing top clearance - minimum meshing top clearance)/2; c) The lower deviation of the outer rotor's inscribed circle is: + minimum meshing top clearance; >20
d) The upper deviation of the outer rotor's inscribed circle is: + (maximum meshing top clearance - minimum meshing top clearance)/2 plus the minimum meshing top clearance; mm
e) The lower deviation of the outer rotor's limit circle diameter should be equal to the lower deviation of the inscribed circle; the upper deviation can be equal or slightly larger than the upper deviation of the inscribed circle. However, the maximum shall not exceed 0.01mm.
For example: For the rotor of model JZS40406, the major diameter is 29.7mm; the minor diameter is 18.5mm; the inscribed circle is 24.1mm; the limit circle is 35.3+0.060;35.3+0.105-0.115
0.045;24.1+0.105
0.045;18.50
mm; the meshing top clearance is 0.06~0.15mm. It should be marked as: 29.7_03.7 Position tolerance
3.7.1 The runout of each tooth top of the inner rotor relative to the inner hole is 0.08mm; 3.7.2 The end faces of the inner and outer rotors respectively run out 0.03mm relative to their inner holes and inscribed circles; +0.060
3.7.3 The runout of the outer circle of the outer rotor relative to the inscribed circle is 0.08mm, and the maximum entity principle is followed. That is, the runout value of 0.08mm is given when the relevant part of the outer rotor is at the maximum entity size, at which time the tooth profile surface is the smallest and the outer circle size is the largest. If it deviates from the maximum entity size, the difference is allowed to be added to the runout tolerance, but the maximum runout value is 0.10mm. The marking example is shown in Figure 1:
Figure 1 Example of marking the outer rotor runout
The surface roughness should comply with the provisions of Table 3.
Outer rotor outer circlebzxz.net
Inner rotor inner hole
Inner and outer rotor end surfaces
Inner and outer rotor tooth profiles
JB/T7908-1999
Table 3 Rotor surface roughness
Roughness
3.9 The outer surface of the rotor shall not be dented, cracked, damaged or oxidized. Sharp corners and burrs shall also be eliminated. The inner and outer rotors shall have good interchangeability. They shall rotate flexibly and without sticking when meshing. 3.10
Test method
The determination of total iron shall be in accordance with the provisions of GB/T223.7. The determination of combined carbon shall be in accordance with the provisions of GB/T223.1. 4.2
The determination of copper content shall be in accordance with the provisions of GB/T223.19. 4.4
The density and oil density shall be determined in accordance with the provisions of GB/T5163. The tensile strength shall be determined in accordance with the provisions of GB/T7964. 4.5
The crushing strength shall be determined in accordance with the provisions of GB/T6804. The apparent hardness shall be determined in accordance with the provisions of GB/T9097.1. The surface roughness can be determined by roughness comparison specimens or sealed specimens. The appearance shall be visually inspected.
Inspection rules
Type inspection
5.1.1Except for chemical composition, tooth profile and parameters for design only, all technical requirements mentioned in this standard and other relevant standards and product drawings are type inspection items.
5.1.2Type tests shall be carried out in any of the following cases: a) When the first production is carried out;
b) When the design, process, material and tooth profile of the rotor are changed; c) When the production is resumed after an interval of 1 year.
5.1.3 The samples for type inspection shall be taken from the rotors that have passed the inspection. 5.2 Items that must be inspected before leaving the factory
Except for chemical composition, all items specified in the technical requirements of this standard and meshing top clearance, outer rotor outer diameter, outer rotor inscribed circle, outer rotor thickness, chamfer, inner rotor major diameter, inner rotor inner hole, inner rotor thickness and inner rotor chamfer are items that must be inspected before leaving the factory.
5.3 Samples for product inspection shall be randomly selected from the qualified batches submitted. 5.4 Sampling and evaluation of physical and mechanical properties inspections shall be in accordance with the provisions of 3.3 of JB/T7905-1999; inspections of other items shall be in accordance with the provisions of 3.2 of JB/T7905-1999. The sampling plan and qualified quality level in the inspection shall be determined by negotiation between the supply and demand parties. JB/T7908-1999
: Each batch of products shall be inspected and qualified by the quality inspection department and a certificate of conformity shall be issued before it can leave the factory. 5.5
Packaging, marking, transportation and storage
Products can only be packaged after they have passed the inspection.
The packaged products must be guaranteed not to be damaged under normal transportation conditions. Under normal storage conditions, they will not rust within half a year from the date of leaving the factory. 6.2
The gross weight of each package shall not exceed 25kg.
The box shall be accompanied by a product inspection certificate.
Outer packaging can be made of wooden boxes or cartons.
6.6 Marking
The marking shall be written or printed on the outside of the box in a conspicuous place. The marking content includes: a) Product name, model and quantity;
b) Net weight and gross weight;
c) Manufacturer's name;
d) Packing date;
e) Write "Handle with care" and "Moisture-proof" and other words. 6.7The rotor should be stored in a dry warehouse.
JB/T7908-1999
Appendix A
(Standard Appendix)
Rotor Materials
The chemical composition ratio of Fe-C-Cu materials is shown in Table A1. Chemical composition ratio of Fe-C-Cu materials
Combined carbon
The chemical composition ratio of Fe-C materials is shown in Table A2. Cu
2Fe-C material chemical composition ratio
Combined carbon
0.25~0.60
(mass fraction)%
(mass fraction)%
People's Republic of China
Mechanical Industry Standard
Internal Combustion Engine Powder Metallurgy Oil Pump Rotor
JB/T7908-1999
Published and issued by the Mechanical Science Research Institute
Printed and edited by the Mechanical Science Research Institute
(Beijing Capital Institute of Technology No. 2 South Road
Format 880×1230
First edition in March 2000
Print run 1-500
Postal code 100044)
Word count 12.000
Printing sheet 1/2
First printing in March 2000
Price 5.00 yuan
99-1189
Mechanical Industry Standard Service Network: http://www.JB.ac.cn666806
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