JB/T 50110-1998 JB/T 50110-1998 Reliability test specification for transmission shaft of four-wheeled agricultural transport vehicle JB/T50110-1998 Standard download decompression password: www.bzxz.net

ICS 65. 060. 10
Standards for Machinery Industry of the People's Republic of China
JB/T 50110—1998
Reliability Assessment Test Specification for Drive Shaft Assembly of Four-wheeled Agricultural Transport Vehicle
(Internal Use)
Published on March 19, 1998
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1998
JB/T501101998
The vehicle standard is proposed and managed by the National Technical Committee for Standardization of Agricultural Transport Vehicles. The responsible drafting unit of this standard is the Tractor Research Institute of the Ministry of Machinery Industry. This standard mainly consists of: Jin Langban, Zhu Yibin, "Scope
Machinery Industry Standard of the People's Republic of China
Four-wheeled agricultural transport vehicle transmission shaft assembly
Reliability assessment test specification
(internal use)
JB/T50110-1998
This standard specifies the test items, test methods and evaluation indicators for the reliability assessment of the transmission auxiliary assembly of four-wheeled agricultural transport vehicles. This standard applies to: The reliability assessment of the total tonnage of the transmission shaft of four-wheeled agricultural transport vehicles, sub-test items
Test items for the reliability assessment of the transmission shaft assembly Includes: a) Static torsion test of the transmission shaft assembly; b) Rotational fatigue life test of the transmission shaft assembly. 3 Definitions This standard adopts the following definitions. 3.1 Transmission shaft An assembly with a cross-type force-coupled auxiliary or solid joint or two cross-type universal joints directly connected, used to transmit the engine torque and rotational motion to the drive shaft. 3.2 Reference state Assembly surface, assembly axis or support part of the transmission shaft when it is installed on an agricultural transport vehicle. 3.3 Standard state The two joints of the transmission shaft are directly connected to each other. The length of the transmission shaft of the transport vehicle when it is in a static and fully stored state in the technical position, and the horizontal drive shaft is the angle of the direction joint. 3.4 Rated torque load T,
The smaller torque is taken as the rated load T between the calculated value of the maximum torque of the engine and the torque value calculated by the maximum rolling force. ) Table engine maximum torque calculation,www.bzxz.net
Tk-TRi
Where T is the torque that the transmission shaft bears when the maximum torque of the engine is calculated, N·mT...Engine maximum torque, N·m
Transmission 1st gear ratio,
b) Calculation of maximum adhesion:
TH-gra
Where; T. -- Calculate the maximum adhesion on the drive shaft according to the maximum adhesion, N· QK Moving axle static load, N,
Adhesion coefficient is 0.8
Rotation radius of the wheel, m:
Approved by the Ministry of Machinery Industry on March 39, 1998
Implemented on July 1, 1998
1. Main tonnage ratio of the driving axle.
4 Total torsion test of the drive shaft
4.1 Test sample
JB/T 50110—1$*8
3 parts are randomly selected from the qualified high schools of no less than E parts of the assessment unit. 4.2 Tests for performance assessment
4.2.1 Test equipment
Torque machine, sensor, recorder, etc.
4.2.2 Test procedure
4.2.2.1 The transmission shaft is installed on the test bench in the standard state. 4.2.2.2 Pre-torque the transmission shaft according to a certain method until the pre-torque reaches the rated load. Then return to the original state. 4.2.2.3 Test according to a certain method for a certain period of time. The continuous loading and recording of the rotation period and its corresponding rotation angle + shall be carried out until any part breaks or plastic deformation stops at any point, and the maximum torque T and the corresponding rotation angle at the time of failure shall be recorded. 1. 3.3 Data processing
Calculate the static extension strength reserve coefficient K-T of each piece respectively
Find the minimum value K of the static torsion strength reserve coefficient of the three samples 4.3 Handleability evaluation index
Kanin>1. 5
5 Torsion fatigue life test of transmission shaft assembly
5.1 Test samples
Machine select 3 pieces from no less than 50 qualified products of the inspected unit. 5.2 Test method for reliability assessment
5.2.1 Test equipment
Decompression torsion fatigue testing machine or other corresponding testing machine. The test load difference shall not exceed -1°C. 5.2.2 Test load
The test load is positive wave alternating load:
Minimum torque Tun=(.3TF
Maximum torque T=T,
Alternating amplitude T,=0.35T
The test frequency depends on the equipment. tt||5.2.3 Test process
5.2.3.1 Install the transmission shaft according to 4.2.2.1. 5.1.3.2 Apply load to the transmission assembly according to 5.2.2. 5.1.3.3 When the load reaches the value specified in 5.2.2, start recording the load times. tt||5.2.3.4 When the test piece breaks (refers to the thinnest part in the transmission assembly breaking), stop the machine and record the cycle life and damage parts. tt||5.2.3.5 When each test piece reaches 20×10+ cycles without damage, terminate the test. 5.3 Evaluation index
3 Each test piece reaches 20×10° cycles without damage as qualified, 2
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