JB/T 50109-1998 This standard specifies the test items, test methods and evaluation indicators for the reliability assessment of the front axle of four-wheeled agricultural transport vehicles. This standard is applicable to the reliability assessment of the front axle of four-wheeled agricultural transport vehicles. JB/T 50109-1998 Reliability Assessment Test Specification for Front Axle Assembly of Four-wheeled Agricultural Transport Vehicles JB/T50109-1998 Standard download decompression password: www.bzxz.net

ICS 65. 060. 10
Machinery Industry Standard of the People's Republic of ChinaWww.bzxZ.net
JB/T50109—1998
Front Axle of Four-wheeled Agricultural Transport Vehicle
Reliability Assessment Test Specification
(Internal Use)
Published on March 19, 1998
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1998
JB/T 50109-1998
This standard is proposed and managed by the National Technical Committee for Tractor Standardization. The responsible drafting unit of this standard is the Yang Tractor Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Jin Xiping and Yao Cheng. 1 Scope
Machinery Industry Standard of the People's Republic of China
Front Axle of Four-wheeled Agricultural Transport Vehicle
Reliability Assessment Test Specification
(Internal Use)
JB/T50109-1998
This standard specifies the test items, test methods and evaluation indicators for the reliability assessment of the front axle of four-wheeled agricultural transport vehicles. This standard applies to the reliability assessment of the front axle of four-wheeled agricultural transport vehicles. 2 Test Items
The test items for the reliability assessment of the front axle include: a) static strength test of vertical bending of the front axle;
b) fatigue life test of vertical bending of the front axle. 3 Static Strength Test of Vertical Bending of Front Axle
3.1 Test Samples
3 pieces are randomly selected from no less than 50 qualified products of the assessed unit. 3.2 Test Methods
3.2.1 Test Equipment
Hydraulic testing machine or other loading device, the test load error shall not exceed ±1%. 3.2.2 Test procedure
3.2.2.1 Adjust the test device so that the axis of the steering knuckle is in the plane determined by the axis of the two kingpin holes of the front axle. 3.2.2.2 The test load shall be applied symmetrically to the centers of the two leaf spring seats and perpendicular to the plane of the leaf spring seats. The fulcrum shall be on the axis of the two steering knuckles and the distance between them is the wheelbase of the two wheels of the front axle. The force point and the fulcrum may also be interchanged. 3.2.2.3 The test load shall be applied once until any part of the specimen breaks or undergoes severe plastic deformation. The test load shall not be applied repeatedly in the meantime. The maximum load at the time of specimen failure shall be recorded.
3.2.3 Data processing
3.2.3.1 Calculate the vertical bending strength reserve coefficient Knl of each front axle: Ku=Qn/Q
Where Qar is the front axle failure load, N;
Q is the static full load axle load of the front axle, N.
3.2.3.2 Find the minimum value Knmix of the reserve coefficient K. of the three front axles. 3.3 Evaluation index of reliability assessment
Kmin>6
Approved by the Ministry of Machinery Industry on March 19, 1998
Implemented on July 1, 1998
4 Front axle vertical bending fatigue life test
4.1 Test samples
JB/T50109-1998
Randomly select 5 pieces from no less than 50 qualified products of the assessed unit. 4.2 Test method of reliability assessment
4.2.1 Test equipment
Hydraulic fatigue testing machine or other corresponding testing machine, the test load error shall not exceed ±1%. 4.2.2 Test load
The load is a sinusoidal alternating load, the lower limit of which is 0.5 times the static full load axle load, and the upper limit of which is 3.5 times the static full load axle load. The test frequency depends on the equipment.
4.2.3 Test procedure
4.2.3.1 Adjust the test device so that the axis of the steering knuckle is in the plane determined by the axis of the two kingpin holes of the front axle. 4.2.3.2 The test load should be symmetrically applied to the center of the two leaf spring seats and perpendicular to the plane of the leaf spring seats. The fulcrum is on the axis of the two steering knuckles, and the distance is the wheelbase of the two wheels of the front axle. The force point and the fulcrum can also be interchanged. 4.2.3.3 The test piece should be stopped when any part breaks or has severe plastic deformation, and the test time (number of times), damage or breakage during the stop should be recorded. 4.2.4 Data processing
The fatigue life of the front axle should be processed according to the log-normal distribution. 4.3 Evaluation index of reliability assessment
Median life N50 ≥ 80X10° times;
Life under 90% survival rate Ng0 ≥ 50×10° times. 2
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