JB/T 51181-2000 This standard is a revision of JB/T 51181-94 "Reliability Assessment Method, Bench Test Method and Failure Judgment Rules for Fuel Injection Pump Delivery Valve Pair". This standard specifies the reliability assessment method, bench test method and failure judgment rules for fuel injection pump delivery valve pair. This standard is applicable to the reliability determination and assessment of fuel injection pump delivery valve pair. This standard was first issued in 1990 as JB/NQ 235-90, and the standard number was adjusted to JB/T 51181-94 in 1994. JB/T 51181-2000 Reliability Assessment Method, Bench Test Method and Failure Judgment for Fuel Injection Pump Delivery Valve Pair JB/T51181-2000 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T51181--2000
Reliability Assessment Method, Bench Test Method and Failure Judgment of Fuel Injection Pump Outlet Valve Components (Internal Use)
2400-(3-3) Issued
National Machinery Industry Bureau
2000-10-01 Implementation
.15:T5181-2000
This standard is a revision of JB/T51181-94 "Reliability Assessment Method, Bench Test Method and Failure Judgment Rules for Fuel Injection Pump Outlet Valve Components". The standard was revised in a general way during the revision, and the main technical content did not change. This standard will replace JB/T5118-94 from the date of implementation. This standard is issued by the China National Standardization Technical Committee and drafted by the Beijing Oil Pump and Nozzle Research Institute. The main drafters of this standard are Shui Pengmin, Song Shejian and Chen Guoqiang. This standard was first issued in 1990. In 1994, the standard number was adjusted to JB.T51181-94: Scope
Machinery Industry Standard of the People's Republic of China
Reliability Assessment of Fuel Injection Pump Outlet Valve Pairs
Evaluation Method, Bench Test Method and Failure Judgment (Internal Use)
JB 5111-2 (H)
The reliability standard specifies the reliability assessment of the oil outlet valve of the injection channel and the failure judgment method of the bench test method. This standard is applicable to the reliability measurement and assessment of the oil outlet valve pair of the injection pump. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through their use in this standard. When this standard is published, the version shown will not be effective. All standards will be revised. When using this standard, the following standards may be subject to new versions. JB/T7174.1: 1993 Diesel fuel injection lubricant parts technical specifications JB/51171: 2000 Diesel fuel pump parts product quality classification [R/T5117-2000: Reliability assessment and evaluation of synthetic fuel pump assemblies, test methods, fault classification and semi-standardization 3 Reliability assessment
3.1 Reliability index
MTTF refers to the average operating time T before the fuel injection pump lubricant parts are ineffective. Formula (1) calculates MTTF:
Where: MTTF-
The average operating time before the peak is the lower operating time,
The number of samples that fail within the test cutoff E: T test cutoff time, h;
--First! The time for the pair of filter parts to fail, h = 0, let MTTF = 2n
3.2 Reliability assessment method
When MTTF is greater than or equal to the specified target value (the target value is agreed with the user, it is qualified; otherwise, it is unqualified,
4 Reliability test method
4.1 Test sample
4.1.1 The filter parts selected for reliability test shall meet the requirements of product drawings and relevant technical documents, and shall be qualified after inspection by the factory inspection department.
4.1.2 Samples shall be collected in the warehouse of the dust production plant or at the end of the production line. The sample boat is less than 90 pairs: samples in use or market, not limited to the sample mother, approved by the State Machinery Industry Bureau 20MM-03-3m 2000-10-01 implementation
JB/T 51181-2000
4.1.3 Take samples of at least 6 pumps and conduct reliability test. 4.2 Test method
4.2.1 The reliability test of the oil delivery valve parts is carried out in the spray pump. 1. Cold drag operation is carried out. 4.2.2 The reliability test of the oil delivery valve parts is carried out in the 750h timed tail test mode. 4.2.3 The reliability test of the oil delivery valve parts is carried out in the same conditions as the spray pump. 2. Adjust the oil supply and its deviation of the spray pump according to the requirements of JB/51178. 4.2.4 Test period If the oil outlet parts are damaged, it is considered as failure, and the failed sample flow test is stopped. 4.2.5 When the outlet valve parts are tested for 750h, the sealing of the surface and the diameter should be checked. The surface sealing shall be tested according to the method specified in BT521712000 + 4.7. If there is air shock, it is judged as failure. 6) The sealing of the diameter shall be tested according to the method specified in 4.B of JB/T511712000. If the diameter sealing value (interval) is more than 3m higher than the membrane value of the same product, it is judged as failure. 5 Time of failure occurrence Www.bzxZ.net
5.1 For failures that can be discovered in time, the exact time of failure shall be recorded. 5.2 For failures that cannot be delayed, the time of occurrence T shall be determined according to formula (2.). If a failure has occurred within [, the time interval, then the mth failure occurrence is called Th = t
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