JB/T 8845-2000 Technical requirements for gearbox control valves for wheel loaders
Some standard content:
ICS53.10n
Machinery Industry Standard of the People's Republic of China
JBIT8845-200U
Wheel loaders transmisslon coatrol valvesTechnical specifications2000-3-30 Issued
National Machinery Industry Bureau
2000-10-01 Implementation
JB/T88452000
This standard is a reduction of JB/T8845-1999 [ZBJ20004--89] Engineering Machinery Transmission Test Method>. Compared with JB845-1999, this standard has been greatly modified, and technical requirements, inspection rules, marking, packaging, transportation and storage have been added. This standard replaces BT45-1999 from the date of implementation. The drafting units of this standard are: Tianban Shicheng Machinery Research Institute, Linhai Hydraulic Parts Factory, Jiangxi Hydraulic Parts Co., Ltd., and Anxian Engineering Department Pressed Parts Factory.
This standard is mainly drafted by: Liu Anshou, Zheng Zhidu, Yong Hailin, Chang Qingsheng: Chinese Machinery Industry Standard
Tire loader transmission control valve
Technical conditions
Wkeel loaders transmissionsmiaslon conirol ylpesTechnical specifiestlons range
JB/T884S--2000
JR/T8845-~1999
This standard specifies the technical requirements, test methods, inspection regulations, marking, packaging, transportation and storage of the sliding type transmission control valve of the tire loader with one or two forward gears and one reverse gear. This standard is applicable to all kinds of variable speed construction machinery for construction of ten-wheeled complete machines (hereinafter referred to as variable speed construction machinery). Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is issued, the versions shown are valid. All standards will be considered. All parties using this standard shall consider the possibility of using the latest version of the following standards.GR/T2R28—198T
GR.T7935—1987
JB.5058—1991
JB,T 79581995
3 Technical requirements
3.1 Requirements
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Technical requirements for components
Quality characteristics of mechanical industry products Grading of hydraulic components Cleanliness assessment and cleanliness index of replacement parts 3.1.! The transmission shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.1.2 Parts can be assembled or put into storage after passing the inspection. Outsourced parts and purchased parts should have inspection certificates and can be put into storage or assembled after passing the inspection of the quality inspection department. 3.1.3 Other technical requirements The requirements shall comply with the provisions of 1.9 and 1.4 of GB. 7935-1987. 3.2 Functional parameters and performance indicators
The power selection parameters and performance indicators of the speed change shall comply with the provisions of Table t. Table 1 Speed change instantaneous power parameters and performance indicators
Nominal load
Nominal force
Nominal load ... Implementation
3.3 Sealing
JB/T 8845-2008
No rolling at the static sealing part, no oil dripping at the dynamic sealing part. 3.4 Load resistance
The speed change valve shall be operated for no less than 100,000 times. After the bench impact test, the increase in internal leakage shall not exceed 10% of the specified value, and the parts shall not have guide wear and other forms of damage. 3.5 Processing quality
The quality characteristics of the parts shall be divided into equal parts according to the provisions of JB/5053, and the qualified quality level AQL value is specified in 5.3.3. 3.6 Assembly quality
3.6.1 The technical requirements for the assembly of the speed change valve shall comply with the provisions of 1.5~1.8 in GB7935-1987. 3. 6.2 Internal cleanliness
The internal cleanliness test method shall comply with the provisions of GB/T 758, and the internal cavity dirt shall not exceed 80 μm. 3.7 Appearance quality
The external quality requirements shall comply with the provisions of 1.10 and 1.11 of GB/T 7935-1987. 4 Test method
4.1 Test device and test conditions
41.1 Test system principle diagram See Figure 1
4.1.2 Test conditions
Table 1.2.1 Test oil
The test pool shall comply with the provisions of 2.3 of GB7935--1987. 4. 1. 2.2 Steady-state components
Only when the range of change of the control parameter does not exceed the specified value in Table 2, the measured value of the test quantity is allowed to be recorded. Table 2 Average value of micro-control parameter Allowable range of change Measurement parameter
Measurement accuracy level
Note: Type inspection shall not be lower than Class B measurement accuracy, and factory delivery shall not be lower than Class C measurement accuracy ± 2.5
JBrr 88452e
· Oil tank: 2: Combustion meter: 3 · Sensor: 4 Oil; 5 Motor: 6- System 7- Ratio meter: 8- Clutch clutch: 9- Interceptor: 10- Flow meter Figure 1 Schematic diagram of pressure test system
4.1, 2.3 Measurement accuracy
The measurement accuracy level is divided into three levels: A, B, and C. The allowable system error of the measurement system is shown in Table 3. Quantity
【P】
Pressure.2MP)
JB/8845-2000
Table 3 Permissible System Error of Egg Testing SystembzxZ.net
Note: Type test shall not be less than Class B suction test plate accuracy, and performance test shall be less than Class C accuracy. 4.1 Test Items and Test Methods
4.2.1 Factory Test
The factory test items and methods of the variable speed valve shall be as specified in Table 4. Table 4 Variable speed valve factory test items and methods Test items and methods
Test heading
Valve function
Pressure regulating performance
Cutting-off performance
External terminal
Test category
Accuracy inspection
Test method
Fill the test pipe with the specified oil flow, move the gear lever to each gear position in turn, check the oil flow with the nominal flow rate, connect the gear lever to the middle position, measure the system flow, observe the pressure change through the pressure gauge 7, and then adjust the thickness of the pad to make the output meet the specified position
Under the condition of No. 2: you can switch each gear position and observe the switching performance of the gear sleeve
? Under winter conditions, move the bar, the current change of the sweep is in each position, the minimum value of each party table under the condition of serial number 2, move the change bar to the service ticket position, and the gas is sent to the standard 05M, and observe the change of the power table of each power. The two shift bars are almost in the center position, and the pressure is: 2MTa, 3min. 1. Each gear has a guaranteed oil supply, small and micro consumption, card meal device, six pressure limit, 2. The pressure board guarantees the large current fixed value, the compensation diagram must be expanded, and the flexibility is used, no card scheme, and the current rate of broadcasting is 301./mlim to maximum slag, all kinds of pressure will not exceed the lower value of the specification, when the replacement is in the middle position, the old pressure value is zero, the opening rate is zero, the ventilation store force drops to the initial position, the valve can immediately return to the normal position, and the force is normal. There is no external discussion on the test purpose. The internal tight surface pressure bundle head operating force type test test category sample omitted JB/T 8845-2000 table 4 [end] test method under the serial number 2 series. Select the dynamic shift lever, eliminate the internal *
【, when the red charge is not in the holding or side gear, the leakage within 1m measured does not exceed the specified value
. Under the requirement of No. 2, record the pressure value of each pressure gauge in each gear, calculate the pressure loss under the requirement of No. 2, and recognize the shifting operation. The speed change type test items and methods are specified in Table 5. Table 5 Variable speed type test items and methods Test requirements Test durability Durability 5 Inspection rules 5. Factory inspection Test method According to the provisions of 4, all the two-section overflow net stone and adjustment gasket are inspected to make the valve pressure positive force to the nominal pressure. And make the flow crown through the type mark to be nominal. Move the shift lever at a frequency of 20-40 times, record the number of shifts, and after the required number of rotations, check the internal lubricity according to the provisions of IB/T7858. The pressure loss shall not be greater than the specified level. The internal lubricity pressure loss shall not be greater than the specified level. The internal lubricity pressure loss shall not be greater than the specified level. The indicators do not exceed the specified level. [． The number of reversing times should not be less than the current specified value after inspection. The internal leakage should not be greater than 10% of the specified value. 3. The main parts should not be damaged or abnormally damaged. The internal dirt should not exceed the specified value. The factory inspection items are divided into full inspection and sampling inspection. The sampling inspection is in accordance with the provisions of GB/T2828. The qualified quality level AQL of the speed change sampling inspection is 2.5, the inspection level is the general inspection level, and one-time sampling is used as the case. The sample size is determined by the manufacturer according to the production batch according to Table 2 of GB292B1987 and the supply and demand parties negotiate and determine. 5.2 Type Inspection
In the following cases, the type inspection should be selected: new product testing or old product transfer to production trial type identification; b) after formal production, if there are major changes in structure, materials, and process that may affect product performance. ) During normal production, periodic inspection shall be conducted regularly (three years for one ship) or after a certain amount of production has been accumulated; d) when the product is stopped for a long time and then resumed production; ) when the factory inspection results are significantly different from the results of the first type inspection; f) when the national quality inspection agency proposes a type inspection requirement. 5.3 Samples
JB/T8845-2000
The sampling of batch products shall be in accordance with the provisions of CB/T2828. 5.3.1 Performance inspection
a) Qualified quality level AQL value: 2.5:
b) Sampling plan type: Normal inspection secondary sampling plan: c) Sample size: 5 sets.
Method: Endurance test sample size can be reduced if necessary. 5.3.2 Internal cleanliness inspection
a) Qualified quality level AQL value: 2.5:
b) Sampling plan type: Normal inspection secondary sampling plan: c) Inspection level: Special inspection level -25.3.3 Parts plus T, quality inspection
53.3.1 Key characteristics (A level]
a) Qualified quality level AQL value: 1.0;
b) Sampling plan type: Normal inspection secondary sampling plan; c) Inspection level: General inspection level II. 5.3.3.2 Quantitative characteristics (B grade)
) Qualified quality level AQL value: 6.5:
b! Sampling case type: regular inspection secondary sampling case; c) Inspection level: general inspection level II, $4 Judgment rules
According to the provisions of GB/T2828
5.4.1 Primary sampling plan
Based on the results of the sample inspection, if the number of non-conforming products found in the sample is less than or equal to the qualified judgment number, the batch is judged to be a qualified batch; if the number of non-conforming products found in the sample is greater than or equal to the non-conforming judgment number, the batch is judged to be a non-conforming batch. 5.4.7 Secondary sampling plan
Based on the results of the sample inspection, if the number of non-conforming products found in the first sample is less than or equal to the first qualified judgment number, the batch is judged to be a qualified batch; if the number of non-conforming products found in the first sample is greater than or equal to the first non-conforming judgment number, the batch is judged to be a non-conforming batch. If the number of unqualified products found in the first sample is greater than the first qualified judgment number but less than the first unqualified judgment number, the second sample shall be checked. If the sum of the unqualified products found in the first and second samples is less than or equal to the second qualified judgment number, the batch shall be classified as a qualified batch; or if the sum of the number of unqualified products found in the first and second samples is greater than or equal to the second unqualified judgment number, the batch shall be judged as an unqualified batch.
6 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of 1.10, 1.11 and Article 3 of GBT7935-1987.2. Quantitative characteristics (B grade)
) Qualified quality level AQL value: 6.5:
b! Sampling case type: regular inspection secondary sampling case; c) Inspection level: general inspection level II, $4 Judgment rules
According to the provisions of GB/T2828
5.4.1 Primary sampling plan
Based on the results of the sample inspection, if the number of unqualified products found in the sample is less than or equal to the qualified judgment number, the batch is judged to be a qualified batch; if the number of unqualified products found in the sample is greater than or equal to the unqualified judgment number, the batch is judged to be an unqualified batch. 5.4.7 Secondary sampling plan
Based on the results of the sample inspection, if the number of unqualified products found in the first sample is less than or equal to the first qualified judgment number, the batch is judged to be a qualified batch; if the number of unqualified products found in the first sample is greater than or equal to the first unqualified judgment number, the batch is judged to be an unqualified batch. If the number of unqualified products found in the first sample is greater than the first qualified judgment number but less than the first unqualified judgment number, the second sample shall be checked. If the sum of the unqualified products found in the first and second samples is less than or equal to the second qualified judgment number, the batch shall be classified as a qualified batch; or if the sum of the number of unqualified products found in the first and second samples is greater than or equal to the second unqualified judgment number, the batch shall be judged as an unqualified batch.
6 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of 1.10, 1.11 and Article 3 of GBT7935-1987.2. Quantitative characteristics (B grade)
) Qualified quality level AQL value: 6.5:
b! Sampling case type: regular inspection secondary sampling case; c) Inspection level: general inspection level II, $4 Judgment rules
According to the provisions of GB/T2828
5.4.1 Primary sampling plan
Based on the results of the sample inspection, if the number of unqualified products found in the sample is less than or equal to the qualified judgment number, the batch is judged to be a qualified batch; if the number of unqualified products found in the sample is greater than or equal to the unqualified judgment number, the batch is judged to be an unqualified batch. 5.4.7 Secondary sampling plan
Based on the results of the sample inspection, if the number of unqualified products found in the first sample is less than or equal to the first qualified judgment number, the batch is judged to be a qualified batch; if the number of unqualified products found in the first sample is greater than or equal to the first unqualified judgment number, the batch is judged to be an unqualified batch. If the number of unqualified products found in the first sample is greater than the first qualified judgment number but less than the first unqualified judgment number, the second sample shall be checked. If the sum of the unqualified products found in the first and second samples is less than or equal to the second qualified judgment number, the batch shall be classified as a qualified batch; or if the sum of the number of unqualified products found in the first and second samples is greater than or equal to the second unqualified judgment number, the batch shall be judged as an unqualified batch.
6 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of 1.10, 1.11 and Article 3 of GBT7935-1987.
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