JB/T 9828-1999 This standard is a revision and merger of NJ 399-86 "Technical conditions for front axle assemblies of wheeled tractors" and ZB/T T64 005-90 "Test methods for fatigue life of front axles of wheeled tractors on benches". The following major technical contents have been changed; - Added requirements for fatigue life and anti-mud and water sealing of the front axle; - Added content on fatigue life evaluation in the front axle bench fatigue test. This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and storage of wheeled tractor front axle components. This standard applies to rigid suspension front axles of wheeled tractors. This standard was first issued on the date of year. JB/T 9828-1999 Technical conditions for front axles of wheeled tractors JB/T9828-1999 Standard download decompression password: www.bzxz.net

ICS 65.060.10
Machinery Industry Standard of the People's Republic of China
JB/T9828—1999
Wheeled tractors
Technical conditions
Frunt axle of wheeled tractors-Specifications
Published on August 6, 1999
State Administration of Machinery Industry
2000-01-(1 Implementation of 3BT9828-1999 Technical Strategy and 7RTT64005-90 Wheeled Tractor This standard combines and amends NF399-86 "Fatigue Life Test Method for Front Auxiliary Axle Assembly of Wheeled Tractor". This standard has some changes from NJ355-86ZB/TT64005-90 in the following major technical contents: 1. Added requirements for fatigue life and glass mud water sealing of the front axle; 2. Added evaluation of wave potential life in the front axle bench fatigue test This standard replaces 741399-86 and 1ZB/1T64005-90 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Technical Committee for Tractor Standardization. The drafting unit of this standard: Luyang Tractor Research Institute. The main contributors of this standard are Yao Cheng, Zheng Songlin, Li Xixing. Scope
Machinery Industry Standard of the People's Republic of China
Front Axle of Wheeled Tractors
Technical Conditions
Front axle of wheeled tractorSpecificatins
JR/T 9829-.1999
with NJ399—86
74/T: T64 (KI1--9)
This standard specifies the technical requirements, test methods, inspection rules, operation, packaging and storage of the front assembly of wheeled tractors, and standardizes the rigid hot channel front axle of wheeled tractors (hereinafter referred to as front axle). 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in technical standards. When this standard is published, the versions shown are valid. All standards are subject to individual design. The parties using this standard shall consider the applicability of the latest version of the following standards. GB 19—1990
GB/T 2828—1987
Packaging, storage and transportation diagrams
Batch inspection sampling procedures and sample tables (applicable to continuous batch inspection) GB60.4—1995 Tractor terminology JB/15673-1991
JB/17734--195
3 Technical requirements
General technical conditions for agricultural and forestry tractors and implements Test methods for waterproof and time-resistant tractors
3.1 The front axle shall comply with the requirements of this standard and be prepared according to the drawings approved by the technical documents. 3.2 The components shall comply with the requirements of relevant standards and can only be assembled after passing the inspection. 3.3 The fastening screws and nuts shall be tightened with the specified torque, and the staggered pins shall be locked with a lock: 3.4 The paint coating on the non-matching outer surface shall comply with the provisions of JET5673. 3.5 The oil seal and end cover of the front wheel must be painted. 3. The axle must not be dented or rusted. 3.7 The clearance of each rotating part of the front axle should meet the design requirements, and there should be no jamming when rotating. 3. The toe-in of the front wheel should meet the design requirements. 3.9 The steering knuckle angle, the rear angle and the front wheel camber angle should meet the requirements. The difference between the left and right corresponding angles is not greater than 453. The maximum turning angle of the front wheel meets the design requirements, and its deviation is not greater than 130°. 3.11 For tractors used in paddy fields, the sealing performance of the front anti-mud bearing shall meet the requirements of 1B/7734. 3.1z For the front axle of tractors mainly engaged in farmland operations, the service life N is 5×1 times when undergoing bidirectional load bending fatigue test: 3.13 For the front axle of tractors mainly engaged in transportation operations, the service life is 8×10 times or the service life at 95% activity rate is 8×0 times when undergoing vertical bending fatigue test.
Approved by the National Machinery Industry Week on August 6, 1999, and implemented on January 1, 2000
JB.T9826-1999
3.14 The validity period of the front axle package is: 1.5 years for small machines, 2 years for large and small tractors. If the product fails within the validity period of the warranty period and the user complies with the assembly, maintenance and use regulations specified in the tractor manual, the manufacturer shall assume the three-guarantee responsibility in accordance with the "Regulations on the Responsibility of Repair, Replacement and Return of Machinery Products". 4 Test method
4.1 The front wheel alignment is tested on the platform, and the test standard is GB/T6960.4. 4.2 The anti-seepage sealing test is in accordance with IB/T7734. 4.3 The front axle bending fatigue life test is in accordance with Appendix A of the standard. 5 Inspection rules
5. Factory inspection
5.1.1 The axle shall be inspected and qualified by the inspection department before it can be shipped or installed. A certificate of conformity shall be attached when leaving the factory. 5.1.2 The factory inspection shall be carried out in accordance with the provisions of 3.3-3.8. 5.1 Type inspection
5.1.1 Regular inspection during mass production, new products or front axles are subject to modification by the owner, and two units are randomly selected from each factory qualified product for inspection. The front axle shall be rejected according to the use and inspection date of the tractor installed, and the test items of 3.11, 3.12 or 3.13 shall be selected. If the 3.13 index is determined by the life distribution line, the number of samples shall be in accordance with the provisions of A2.1: 5.2.2 The result of type inspection shall not be less than the provisions of this standard: When the new product or front axle is received, the cumulative inspection result shall not be less than the provisions of the standard, and the product is considered to be finalized. 5.2.3 The ordering unit has the right to conduct random inspections on the received products, and the test items can be selected at will. The sample size, quality level and inspection level of the random inspection shall be in accordance with the provisions of GB/L2828. The specific sampling plan and judgment rules can be agreed upon by the supply and demand parties. 6 Marking, packaging, storage
6. If the front axle is manufactured in a special factory, it does not need to be marked and packaged separately. Its storage shall be in accordance with the provisions of 6.5. 6.2 If the front axle is manufactured in a special factory, it shall be marked, packaged and stored in accordance with the requirements of the international cooperation agreement or 6.3.5. 6.3 The label on the front axle shall be clear, installed properly and firmly, and shall indicate the following: a) Product name:
b) Product model or mark;
c) Load-bearing capacity of the front axle:
d) Production number:
d) Manufacturing date: year, month:
Manufacturer name and address.
6.4 Packaging
6.4.1 The product documents packed with the front axle are: a) Product certificate and warranty;
b) Product manual:
Packing list.
6.4.2 Packaging, all exposed parts should be protected, dust and moisture-proof measures should be taken in the packaging box, the packaging materials should have moisture-proof performance, the packaging must be reliable,
JE/r 9828—1999
1.4.3 The inner packaging and fixing of accessories and spare parts should not be damaged or scattered during normal transportation: 1.4.4 The following should be marked on the outside of the packaging box, and the markings should comply with the provisions of G191. Company Development and Receiving Unit:
b) Product model and name;
Quality;
d) Overall dimensions:
e) Name and address of the selection factory:
Transportation precautions;
more) Packing date: year, month, month.
6.5 Practice
6.5.1 The product should be stored in a dry and acid-free room and should not be stored in ink. 6.5.2 Under normal storage conditions, the product should have an effective anti-rust period of 12 months. 3
AI, Definition, Symbol
This specification adopts the following definitions and symbols.
A1.1 Center plane
1B/T9828—1999
(Appendix to the standard)
Front axle bending fatigue test method
The plane passing through the midpoint of the axle and perpendicular to the axis of the front sheath, AI.2 Static test of the front axle
When towing underwater, the load distributed on the front axle of the whole machine. When the push-pull machine is used at a low speed, the static load of the front axle is represented by F: when the maximum counterweight is added to the front axle, the static load of the front axle is represented by A2 Front axle bending fatigue test case
AZ1 Test sample
When the whole fatigue life distribution curve is determined, the test sample shall be randomly selected from no less than 5 qualified products. A2.2 Test equipment
Sugar compression whole fatigue test machine or other similar test machines: the test load error shall not exceed ±1%, A3 Front axle vertical bending fatigue test
A3.! Clamp the front axle on the test bench as shown in Figure A. The distance between the two ends of the support point is suitable for normal use, and ensure that the parts do not rotate when the cross section is cut off. The axis of the swing shaft is parallel to the horizontal plane: Figure A1
A3.2 Apply a positive wave pulsating cyclic load of equal amplitude to the symmetric plane of the front axle. The lower limit of the load F is 0.5F and the upper limit is 4F. Its direction is multiplied by the horizontal plane. The test frequency is generally above 4Hz.
A3.3 Test evaluationbZxz.net
The vertical bending fatigue life of the front axle is expressed by the number of load cycles it can withstand. The curve obtained by fitting the life data of the 5 tested samples according to the logarithmic normal distribution is taken to evaluate the life under 95% survival rate. The value should meet the requirements of 3.13. A4 Front axle bidirectional bending fatigue test method A4.2 Clamp the front auxiliary, bracket and other related components on the test bench as shown in Figure A2, adjust the front axle to the maximum wheelbase, connect the support plate to one end of the front wheel with a support bolt so that the front axle can be loaded vertically and in the forward and backward directions at the point corresponding to the center line of the wheel, and support the front axle at the other end: keep the test piece in a horizontal position during the test and the steering knuckle so that the wheel will not rotate. A2.2 Apply alternating loads Fxr and Fac in the forward and backward directions to the wheel, see formula (A) and formula (A2) respectively. 1. N: Fxr=121F
Fac= 242F
Where: - rated power of power output shaft, kw. A4.3 A vertical load F is applied to the wheel during normal operation [see formula (A3) 1, N: FJ.5F, +
A4.4 Each complete loading cycle may include two vertical loads, one forward and one backward, in the following order: 8 add vertical load:
b) add horizontal load;
c) remove horizontal load;
d) remove vertical load.
A4.5 The test frequency is 0.150.25Hz.
44.6 Test evaluation
The fatigue life of the front axle is expressed by the number of loading cycles to which the fatigue failure part is subjected. The life of the test specimen must comply with the provisions of 3.12:
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