GB/T 2940-1982 Technical requirements for fuel injection pumps, speed regulators and fuel injector springs for diesel engines GB/T2940-1982 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Technical specifications of springs for fuel pump, governor and injector of diesel enginesUDC
621.888.4
GB 2940—82
This standard applies to plunger springs for fuel pumps, oil delivery valve springs, governor springs and pressure regulating springs for injectors for diesel engines. The type is cylindrical spiral type.
↑Technical requirements
1.1 The terminology of the terminology shall be in accordance with the provisions of GB1805--79 "Spring Terminology". 1.2 Spring materials, generally selected according to Table 1. Table 1
Material name
Carbon spring steel wire for special purposes
Carbon spring steel wire
Spring steel wire for important purposes
Ming vanadium high elastic storage steel wire
Oil-floating chrome vanadium valve spring steel wire
Oil-fired carbon valve spring steel wire
Code domain steel grade
Group A, Group B
Group I, Group Ia
50CrVA
50CrVA
65Mn, 70
Material standard
GB 2271-80
1.3 For cold-rolled springs that have been quenched and tempered, the quenching times shall not exceed twice, and the tempering times are unlimited; the hardness value is in the range of HRC45 to 50. The hardness of the injection pump pressure regulating spring can be increased, but shall not exceed HRC54. 1.4 Permissible deviation of spring load (rigidity) 1.4.1 Permissible deviation of plunger spring load: Pi is ±0.1P, P2 is ±0.06P. 1.4.2 Permissible deviation of the rigidity of the oil outlet valve spring, the injector pressure regulating spring and the speed regulator spring shall be as specified in Table 2. Table 2
Oil delivery valve spring,
Spring category
Injector pressure regulating spring
"Correction spring, speed regulating outer spring
Stiffness difference
Speed ​​regulating spring
Speed ​​regulating tension and length spring
Speed ​​regulating torsion spring
± 0.08p.
1.4.3 According to the requirements of use, the oil delivery valve spring, injector pressure regulating spring and speed regulating spring may also require load. The allowable deviation shall be in accordance with Table 3 and shall be indicated in the drawing.
Promulgated by the General Administration of Standards of the People's Republic of China in 198203-16
Implementation in 19821101
Spring category
Load tolerance
Oil outlet valve spring,
Injector adjustment spring
GB 2940—82
Correction spring, speed regulating outer spring
Speed ​​regulating spring
Speed ​​regulating tension and compression spring
kgf(N)
Speed ​​regulating torsion spring
According to the use requirements, the allowable deviation of the stiffness (load) of the oil outlet valve spring can be manufactured according to ±0.05P (P), and the allowable deviation of the stiffness (load) of the speed regulating torsion spring can be manufactured according to ±0.06M (M), and it shall be indicated in the drawing. 1.5 Permissible deviation of spring outer diameter (inner diameter)
1.5.1 The permissible deviation of outer diameter (inner diameter) of plunger spring, oil outlet valve spring and injector pressure regulating spring shall be as specified in Table 4. Table 4
Spring category
Outer (inner) diameter deviation
Minimum value
Plunger spring
Oil outlet valve spring
Note: According to the use requirements, plunger spring can be manufactured according to ±0.01D and indicate it in the drawing. The permissible deviation of outer diameter (inner diameter) of speed regulating spring shall be as specified in Table 5. 1.5.2
Winding ratio C
Spring form
Outer diameter (inner diameter) tolerance mm
Note: According to the use requirements, the permissible deviation of the inner diameter of speed regulating torsion spring can be manufactured according to ±0.2mm and indicate it in the drawing. Permissible deviation of spring free height (length) 1.6
Injector tuning spring
Minimum
The permissible deviation of free height of plunger spring, oil outlet valve spring and injector pressure regulating spring shall be as specified in Table 6. 1.6.1
Spring category
Plunger spring
Oil outlet valve spring
Injector pressure regulating spring
Free height filling circuit
±0.02H (minimum value ±1)
Opening pressure mode
Adjustment,
Use pressure regulating screw
±0.025H.
Note: ① When two-point load is required for injector pressure regulating spring, free height is not tested. Use gasket
GB 2940— 82
②The oil outlet spring can be divided into two dimensions and packaged and delivered separately. If the user has special needs, the two parties can agree that it can also be divided into three groups. 1.6.2 The allowable deviation of the free height (length) of the speed governor spring shall be as specified in Table 7. Table 7
Free height (length) tolerance
Minimum value
Speed ​​governor compression spring
Correction springbZxz.net
Start spring
Idle spring
±0.0151.
Round hook ring type speed governor tension spring free length
20 ～~ 60
Note: According to the use requirements, the speed governor torsion spring can be manufactured according to ±0.5mm, and it shall be indicated in the drawing. 1.7 Spring pitch unevenness
60～120
Special hook
Speed ​​regulating tension spring
When the spring is compressed to the maximum working deformation plus 10% of the total deformation (not exceeding 85% of the total deformation), the spring coils of normal pitch are not allowed to touch. 1.8 The verticality tolerance of the spring axis to the two end coils shall be as specified in Table 8. Table 8
Vertical tolerance
Minimum value
Plunger spring
Oil outlet valve spring
Injector pressure regulating spring
Note: With the user's consent, the speed regulating external compression spring can be manufactured according to 0.0175H. Speed ​​regulating compression spring
Correction compression spring
0.015H.
1.9 The two ends of the compression spring should be tightened, and the allowable clearance of the end rings shall be as follows: when C≥6, no more than F0.3mm,
when C.6, no more than o.2 mm.
Starting compression spring
Rapid compression spring
1.10 The bearing surface of the two ends of the compression spring should be ground half, and the ground part should not be less than 270. The thickness of the end head is about 1/4d, but not less than 1/8d. 1.11 The finish of the two ends of the compression spring shall be as specified in Table 9. Table 9
Column spring, speed regulating spring, oil outlet valve spring, injector pressure regulating spring
Finish requirements
Note: The finish of the column spring and speed regulating spring should be checked before shot peening. 1.12 When the speed regulating tension spring is in the free state, the position tolerance of the center of the hook ring facing the spring axis (Figure 1) shall be as specified in Table 10. 244
Spring center diameter D2
20～30
-30~50
GB 2940-82
The relative angle tolerance of the two hooks of the speed-adjusting tension spring (as shown in Figure 2) shall be as specified in Table 11. The length allowable deviation of the opening of the hook of the speed-adjusting tension spring at the plane
Spring center diameter D2
Tolerance value
The length allowable deviation of the hook of the speed-adjusting tension spring shall be as specified in Table 12. Tolerance value
Two hooks are 90°
>10 ~ 25
>25~50
Open
Allowable deviation
GB2940—82
The verticality of the two torsion arms of the speed regulating torsion spring to the spring axis is 0.015/manufactured, with a minimum value of 0.5mm, as shown in Figure 3. 0.015/
6 The support points of the two torsion arms of the speed regulating torsion spring should be in the same plane as the spring axis, and the tolerance value is 0.3mm (see Figure 4). According to the use requirements of 1. 16
, it can be manufactured according to 0.15mm and indicated in the drawing. The tolerance of the angle of the torsion arm support point is 8". The tolerance of the parallelism of the connecting line of the two torsion arm support circles of the speed torsion spring to the spring axis is 0.3mm, as shown in Figure 5. 246 GB 2940-82 The tolerance of the length of the two torsion arms of the speed torsion spring (when the action point is fixed) is manufactured as 1mm. According to the requirements of use, it can also be manufactured as 0.7mm, and it shall be indicated in the drawing. The spring shall be fixed and no permanent deformation is allowed. 1.20
The surface of the spring should be inspected (or inspected by other corresponding methods). The spring should be treated with surface anti-corrosion.
The plunger spring and the injector pressure regulating spring should be shot peened. According to the use requirements, the spring can be subjected to strong pressure treatment or heating strong pressure treatment, or electropolishing treatment. Other technical requirements not specified in this standard shall be in accordance with GB1239-76 "Ordinary Cylindrical Helical Spring". 2 Test method
2.1 Inspection of permanent deformation of spring
Compress (stretch, twist) the finished spring twice to the height (length, angle) specified in the drawing, measure the height (length or angle) after the second compression, and then press for the third time and measure the height (length, angle). If the difference is not greater than 0.05mm, it is considered that there is no permanent deformation. 2.2 Determination of spring characteristics
2.2.1 Load measurement, use the corresponding spring force measuring instrument for measurement. 2.2.2 Stiffness measurement, calculate the spring stiffness according to the following formula: pt:
kgf(N)/mm
The torsional stiffness (M) of the speed-adjusting torsion spring should be measured within the load range of 30% to 70% during inspection. Calculate its stiffness according to the following formula: M2-M
kgf(N)· mm/Deg
（2）
Where P1 and P2 are the working torsion angles under the corresponding working torques M and M2, respectively. The relevant positions should be measured with special measuring tools. 2.3 Inspection of spring surface treatment quality
2.3.1 Quality inspection of finished springs after oxidation treatment Appearance inspection - Carry out according to the routine inspection of oxide film. - Use the test liquid immersion method.
Corrosion resistance inspection -
2.3.2 Quality inspection of finished springs with surface coating Appearance inspection - Carry out according to the routine inspection of coating appearance. 247
GB2940—82
Coating thickness inspection: measured by timed liquid flow method or other special thickness gauge. 2.4 Other test methods shall be in accordance with the provisions of GB1239—76. 3 Inspection rules
The ordering unit shall conduct sampling inspection on spring products produced in batches and mass production to determine whether the batch of products delivered is qualified to determine whether to accept or reject.
3.1 Terminology
3.1.1 Batch and batch
The batch referred to in this rule is the inspection batch. The products in the batch must be of the same model and specification in batch and mass production, and manufactured under the same conditions such as material brand and production process. The number of unit products contained in the batch is called the batch. 3.1.2 Unit product
The unit product is the basic unit divided for the purpose of implementing sampling inspection, that is, a spring product (that is, an inspection unit). 3.2 Sampling plan
The sampling plan is a set of regulations on the size of the sample to be drawn from each batch of products and the determination of whether the batch of products is qualified. 3.2.1 Sub-sampling plan
A sample (n) is randomly drawn from the batch, and the batch is judged to be qualified based on the inspection results of the sample. If the number of unqualified products in the sample (d) is less than or equal to the specified qualified judgment number (dRe), then the batch is a non-conforming batch and is rejected. 3.2.2 Secondary sampling plan
First randomly select the first sample (unit product number n) from the batch. According to the inspection result of the th sample, judge whether the batch is qualified or needs a second inspection. If the number of non-conforming products in the sample (di) is less than or equal to the first qualified judgment number (di
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