This standard specifies the torsional fatigue test method for tractor and agricultural and forestry machinery drive wheels. This standard applies to the wheels of tractors, combine harvesters and agricultural implements equipped with drive tires. GB/T 14786-1993 Test method for torsional fatigue of tractor and agricultural and forestry machinery wheels GB/T14786-1993 Standard download decompression password: www.bzxz.net

11D631. 372 : 529. 11. 0*2. 3 : 620 178- 3T64
National Standard of the People's Republic of China
GB/T 14786—93
Wheels torsion fatigue test methodsfor tractors,agricultural and forestry machines1993-12-27Promulgated
National Technical Supervision Bureau
Implemented on 1994-08-01
National Standard of the People's Republic of China
Wheels torsion fatigue test methodsfor tractors,agricultural and forestry machines 7 Subject content and scope of application
This standard specifies the torsion test method for the dynamic wheel of a tractor and a machine. This standard is applicable to the wheels equipped with the driving wheels of a sowing machine, a harvesting machine and a large agricultural machine. 2 Test sample
The test sample should be a finished wheel that has been tested. 3 Test equipment
GH/T14786—93
3.1 The test bench should have a device that can make the wheel bear the clockwise force and twist it to the maximum extent (see Figure 1). Other tests with the same principle can be used.
3.2 Tighten the wheel as required by the test requirements. 4 Test method
4.1 Installation and adjustment
4.1.1 Install the test vehicle bolt (5) on the connecting flange (3): the four sides of the fastener are facing the test bench moving end (8), and the bolts are adjusted to the torque value specified by the main engine manufacturer or test requirements. The bolts and nuts are not allowed to be lubricated. They can be tightened again during the test. 4.1.2 Move the chain seat (6) radially in the middle of the disc (7) to the position where the pressure plate (4) clamps the wheel flange, and when the wheel is installed with the same prestress, tighten all the parts. 4.1.3 The load system should maintain a certain load, and the error should not exceed ±5%. Approved by the State Technical Supervision Commission on 1993-12-27 and implemented on 1994-08-01
2 Determination of the specification
CE/T14786-93
Figure 1 Single-wheel torsion strength test bench 1 Test bench for front end 2 Anti-climbing platform model: 3-standard flange; d-industry photography. Block: 5-core test grid: 6-right short millimeter: 7-surface: 8-test combined power forbidden end torque M in N · The measurement is determined by the following formula: the adhesion coefficient of the matching wheel is taken as .65; length is the rolling half weight of the matching wheel, half of the true external weight of the new and inflated tire according to the national tire standard, multiplied by the rolling radius to give an approximate calculation, m
F is the rated load of the wheel specified by the wheel manufacturer, or the maximum load of the maximum wheel specified for the matching wheel, whichever is better, N: K---strengthening factor, take 1.1.
4.3 Loading of torque
4.3.1 The torque load is determined by the rotation of the wheel when the vehicle is moving forward (the torque added is in the direction equivalent to the rotation direction of the wheel when the vehicle is moving forward). 4.3.2 Counterclockwise rotation, half of the load determined in 4.2 (torque applied in the direction of rotation of the wheel when the vehicle moves backwards),
4.3.3 Clockwise and counterclockwise loading and intermittent loading are one cycle. 4.4 Test adjustment frequencywwW.bzxz.Net
Test wheel per minute 50+10 cycles.
4. 5 Test number
2.5×10 cycles.
4. 6 Test failure period GB/147E6 Wheel deformation occurs, no continued load bearing: Wheel section cracking effect: Wheel rivet replacement cracking load separation according to additional instructions, the standard is proposed by the Ministry of Machinery Industry: This standard is the National Machinery Standard Technical Committee. The standard is drafted by the Machinery and Electronics Industry Department Yang Tractor Research Institute, China Agricultural Mechanization Science Research Institute. The main contributors are Shen Wuquan, Yang Huiling, Feng Lanying,
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