This standard specifies the lateral load fatigue test method for wheels of tractors and agricultural and forestry machinery. This standard applies to wheels used on tractors, combine harvesters and agricultural implements. GB/T 14785-1993 Lateral load fatigue test method for wheels of tractors and agricultural and forestry machinery GB/T14785-1993 Standard download decompression password: www.bzxz.net

11Tx 631. 372 : 629. 11. 012. 3 : 620. 178- 3T54
National Standard of the People's Republic of China
GB/T 14785—93
Wheels side load fatigue test methodsfor tractors,agricultural and forestry machines1993-12-27Promulgated
National Technical Supervision Bureau
1994-08-01Implementation
National Standard of the People's Republic of China
Wheels side Inad farigue test methodefer tractnrs -agricultural and forestry Content and scope of application
This standard specifies the side load test of wheels for tractors and agricultural and forestry machinery. This standard applies to wheels used for tractors, combine harvesters and agricultural machinery. 2 Test samples
The test samples should be qualified quality wheels that have passed factory inspection. 3 Test equipment
CB/T 14785--93
3.1 The test bench should have a device that allows the wheel to withstand the torque (see Figure 1). Other test benches with the same loading principle may also be used. 3.2 Fasten the wheel as specified in the test requirements Figure 1 Wheel example Negative embedding Fatigue test bench Figure 1 Test bench table; 2 - Connecting flange 13 - Test wheel 14 - Dismantle plate, press block: = - Please 16 Processing frequency - Endurance total: 8 - Accelerate plate: 9 Sample height pre-delivery 10 Limiting clause 11 - Use position whole support case
State Technical Supervision Bureau 1993-12-27 Approved 1994-08-01 Wide
4 Test method
4.1 Installation and replacement
GB/T14785-93
4.1.1 The test wheel (3) is installed on the reverse flange (2) so that the four sides of the wheel need to face the load stop, and the explosion resistance and the mother control are tightened to the requirements of the main cutting double test requirements. The bolts and nuts are not allowed to be fully lubricated. They are allowed to be re-condensed during the test. 4.1.2 Install the pressure plate and pressure block (4) on the wheel rim of the vehicle, adjust the pressure plate (6). Align the center of the pressure plate (8) with the elevation mark (9), test the swing plate of the load plate family to the center of the rotation within the diameter of 10mm, tighten all the tightness, and lock the limit position (6). 4.1.3 Adjust the limit bracket (11). Make the distance between the limit wheel and the limit button (10) 15mm, 4.1.4 The pressure system should maintain the specified load, and the error should not exceed ±5. 4.2 Variable torque applied by the wheel side load
Once the wheel is applied with torque, a force is applied to the mounting surface of the wheel at a certain distance (lever arm). 4.2 .1 Determination of bending moment
The bending moment M (Nm) is determined by the formula:
M-(uR+dF-5
In the formula, A
The lateral attachment number of the wheel tire, 0.55; ..()
K-the rolling half light of the wheel tire, half of the new inflated outer diameter in the national wheel insurance standard, multiplied by 94% for the driving wheel and 96% for the guide tire and agricultural machinery tire, and the rolling radius m is approximately calculated: d-the wheel image distance, m (the wheel is taken when the common wheel width is taken) F~The new rated load of the wheel specified by the wheel manufacturer, or the maximum load of the largest tire specified for the wheel, whichever is greater, NS.-Reinforcement coefficient, the maximum value is 1.1.bzxZ.net
Note: The front of the wheel is The 4.2.2 Calculation of the mass of the counterweight
This test bench applies the counterweight with a single quick measurement formula (2m,-(-6.m)
wherein: the moment between the mounting surface of the wheel sheath and the parallel force applied to the counterweight, m; the distance between the mounting surface of the wheel spoke and the center of gravity of the machine tree, mRE
counterweight mass.kgt
research—the mass of the added mechanism g
g or force acceleration, 9.Bm/gl
4.3 Test rate
The test wheel makes 30 full revolutions per minute and 10 times. 4.4 Test times
4.4.1 The wheel equipped with the driving wheel passes through 7×[0+this cycle+4. 4.2 The wheel equipped with the guide wheel passes through 1×10° cycles. 4.5 Test failure judgment
Annual ring plastic deformation can no longer bear the load; h.
Wheel cross section shows cracks:
c. Wheel welds, rivets are broken or detached,
Additional remarks:
This standard is proposed by the Ministry of Machinery Industry.
CB/T14785-93
This standard is sponsored by the National Tractor Standardization Committee and drafted by the Ministry of Machinery Industry. The Tractor Research Institute and the China Academy of Mechanization Research are funded by the Ministry of Machinery Industry. The main drafters of this standard are Shen Niuquan, Ti Huiling, and Feng Lanying. 3
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