JB/T 5118-2000 This standard is a revision and merger of JB/T 51180.1-94 "Reliability Assessment Method for Split-Type Fuel Injection Pump Assembly", JB/T 51180.2-94 "Reliability Assessment Bench Test Method for Split-Type Fuel Injection Pump Assembly" and JB/T 51180.3-94 "Fault Classification and Judgment Rules for Reliability Assessment of Split-Type Fuel Injection Pump Assembly". This standard specifies the reliability assessment method, bench test method, fault classification and judgment rules for split-type fuel injection pump assembly. This standard is applicable to the reliability measurement and assessment of split-type fuel injection pump assembly. This standard was first issued in 1990 as JB/NQ 234.1~234.3-90, and the standard number was adjusted to JB/T 51180.1~51180.3-94 in September 1994. JB/T 51180-2000 Reliability assessment method, bench test method, fault classification and judgment rules for split-type fuel injection pump assembly JB/T51180-2000 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
IH/T51180-20
Reliability assessment of split fuel injection pump assembly
Evaluation method, bench test method,
Fault classification and judgment rules
(internal use)
. Issued on 2000-03-30
Issued by the State Machinery Industry Bureau
Implementation on 2000-10-01
JB51180—2000
This standard is sufficient to revise JB/T51[80.1-94 Reliability assessment method for split fuel injection and assembly, JB/T511802—94 Reliability assessment bench test method for split fuel injection pump assembly and JB/T51180—94 Reliability assessment fault classification and judgment rules for split fuel injection and assembly. During the reorganization, the original two standards were divided into two standards and editorial changes were made. Compared with B/T51180.1-51180.3-4, the main technical content of this standard has not changed. This standard replaces B/T51180.1-51180.3-4 from the date of implementation. The standard is proposed and included in the Technical Committee for Standardization of Oil Pump Nozzles. The drafting unit of this standard: Oil Pump Nozzle Research Institute. The main drafters of the standard: Zhu Fen, Zhang Cemin, Chen Guodian. This standard was first issued in 1990 and the standard number was adjusted to JB/TS1180.[-51180.3.94 in 1994. Scope: Mechanical Industry Standard of the People's Republic of China. Reliability assessment of split-type fuel injection pump assembly. Evaluation method, bench test method, fault classification and judgment rules (internal government). JBT 51180—2000. 51[80,15([80.3—94
This standard specifies the evaluation method, test bench test, classification and judgment rules for the quality of the total oil system. The standard specifies the determination and evaluation of the quality of the total oil system or the quality of the oil system. 2 Reference standards
The text contained in the approved plan shall be cited in this standard and shall constitute the provisions of this standard. This standard is published. The versions shown are valid. Any revision will be encouraged. Parties using this standard should explore the possibility of using the latest version. GB 252—1994
Light diesel
Technical conditions for fuel injection pump test
JB.T9734—1999
JB/5:178-2000 Reliability evaluation method for composite fuel injection pump assembly, test piece method, classification and semi-definite rule 3 Reliability evaluation method
3.1 Reliability index
3.1.1 Mean time between failures
The average time between two adjacent failures of parallel fuel injection pump assembly, micro test (") light type (2) calculation. MIB
In: MTBE
Mean failure rate, h;
-Reliability test sample number:
-Reliability test time, h;
The sum of the number of failures (except minor failures) during the test period; E.
-The cumulative number of samples, h. When -0, MIBF-2nf.
3.1.2 Average operating time before the first failure
refers to the average operating time before the first failure occurs, calculated by formula (3) or formula (4), MTFF--
Approved by the National Machinery Industry Bureau on March 30, 2000
Implementation on October 1, 2000
Formula: MTTFF-
JR/T51189-2000
The average working time before the first failure, h:
The number of samples with the first failure (except minor failures) in the tested samples: (4)
The accumulated working time of the first failure (except minor failures) of each sample, h:5The accumulated working time of the first sample that has not had the first failure (except minor failures) in the tested samples at the end of the reliability test, h.
=, let MITPF-.
3.1.3 Unexplained degradation score ()
For the comprehensive evaluation of the fault-free performance of the split-type fuel injection source assembly, calculate according to formula (5):30bzxz.net
Q=1ng-3
Where: ——The total number of various types of faults that occur in the sample within the test deadline; K,——The hazard coefficient of the first fault. The hazard coefficients of various types of faults are as follows: severe fault, K-30; generally considered, K-20; minor fault, K=10;
——The accumulated operating time of the sample when the first fault occurs, h, when Q is used, let Q-0
3.1.4 months, the limit life
refers to the operating time when the product reaches the limit state when it is used under the specified residual conditions. Statistics, according to the actual number of hours of use when the sample reaches the limit state, the order from small to large is: I, +.. +... t.
When it is an odd number, B. The limit life is: m When it is a code number, B The limit life is [2+t1+l/2 The limit state is usually a state of damage to the point of no current value. 3.2 Reliability determination or assessment The reliability determination or examination of the oil accumulation assembly shall be carried out and evaluated through the test method of cold dragging on the bench. The following shall be proposed to conduct user reliability inspection in accordance with the standard.
331 Special bench reliability station night
The bench reliability test method shall be carried out in accordance with the provisions of Section 4 of this standard. The assessment indicators are the average working time before the first failure (MTTFF), the average friction time interval fashion (MTDF), and the comprehensive evaluation of failure (Q). 3.2.2 User survey 3.2.2. It can be carried out in the form of user fixed-point test, account tracking or follow-up repair and user information feedback. 3.2.2.2 Adjustment items are the average working time before the first failure (MTTF) and the maximum life of the B. 3.2.2.3 User inspection sample is not less than 10. After the reliability test of the injection system assembly is completed, the reliability index value is calculated according to 3.1. If the qualified values ​​of each item are greater than or equal to 2, the target value specified in the indoor bench cold drag test in JD/T51180-2000 and the standard is The value is in accordance with the agreement between the manufacturer and the user. If there is no failure in the service life, it is judged as qualified; otherwise, it is judged as unqualified.
4 Reliability test method
4.1 Test sample
: 4.1.1 The sample of the reliability test shall comply with the provisions of the product drawings and relevant technical documents, and shall be qualified by the inspection department of the T! 4.1.2 Sampling at the end of the production plant warehouse or production line, the sample size shall not be greater than 50; in the oil sample in the market, the sample size of this limit is 4. 1.3 5 oil samples,
4.2 Test conditions
4.2.! Use a full-scale oil discharge pump to test the compatibility test bench, meet the requirements specified in Table 1, the compatibility test bench requirements
pull the fluctuation
test oil
test tank outlet injection
theft recruitment
use the card
can meet 200min When the maximum speed is 15%, the No. 0 light diesel oil that meets the 752 standard meets the requirements of test 1. 4.2. The feasibility test bench should be equipped with an injector assembly that matches the test spray object. 4.2.3 The test bench used to detect the overall performance of the split-type injection object should meet the requirements of JB/T9734. 4.3 Acid stop 4.3.1 Feasibility of split-type injection assembly The test is carried out in cold running on the indoor test storage. 4.3.1 The reliability test of the split type oil suction pump assembly is carried out in the reverse direction according to the 750h timing interception test mode. 4.3.3 The reliability test of the split type spray pump assembly should be carried out according to the requirements of the large load type of the machine model. The test condition is 10% of the standard impulse at the oil supply plate, etc., and the deviation of the tank mouth is as required! The test speed is the standard speed. 4.3.4 During the color test, the test is carried out in stages. The inspection time is: U, 150, 300, 500, 75Uh. ) During the stage inspection, if the test value is reduced by 5% (relative to the factory requirement), the purchase shall be updated and adjusted according to the requirements of 4.3.3 and recorded as a performance drop:
6 During the test period, if the parts are damaged, they shall be replaced or repaired immediately, and the requirements of 4.3.3 shall be updated and adjusted, and recorded as a component failure.
4.3.5 During the feasibility test, maintenance should be carried out according to the product manual: 5 Fault classification and judgment rules
5.1 Fault definition
5.1.1 Essential fault
Failure caused by a defect in the oil pump assembly itself under specified environmental conditions. 5.1.2 Minimum fault
Failure caused by reasons other than the four factors in the oil pump assembly itself or caused by a previous fault. 5.2 Effective fault classification
JB/T 51180—2000
Failures of oil pump assemblies in reliability tests and actual use are divided into four categories according to the degree of severity. The category codes, names and definitions are shown in Table 2.
Table 2 Fault severity categories
Category Number
Factual fault
Severe
General
Minor
S.3 Fault occurrence time
Dangerous fault or causing major economic loss
Except for fatal faults, serious faults can be accurately classified into the following categories: normal operation or replacement or some complex faults. There are five major hazard solutions, only in the fixed degree of grouping, they are divided into six types: fuel injection assembly 1. It is easy to operate like a buried obstacle, and it will not be pregnant when it is operated. It is more important to directly deal with it in daily maintenance. It is called a minor fault. 5.3.1 For faults that can be discovered in time, record their exact occurrence time. 5.3.2 For faults that cannot be discovered in time, determine their occurrence time Ti according to formula (6). A certain group of units has been in operation for [7, and there are faults occurring within the time interval. The time when the first fault occurs is: , =1
5.4 Fault judgment rules
5.4.1 When calculating the visible index, only the essential faults are counted, and the modified faults are not counted repeatedly, but they should be recorded truthfully in the fault statistics table. 5.4.2 The essential faults should be evaluated and classified based on the serious consequences of the faults. A fault can only be judged as a type 2 fault. 5.4.3 The modified faults of the fuel injection assembly and their categories should be classified according to Appendix B of T51178-2000 (Standard Appendix). If the faults not listed in the table R are found, the fault classification principles in Table 3 of T51178-2000 can be used to judge their categories according to the examples in Table B.
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