QC/T 1218-2025Automatic dump semi-trailer (English PDF)

4.1 General requirements

4.1.1 The outer surface of the wheel side drive axle shall be clean, free from rust and oxidation, and free from defects such as cracks and burrs that affect performance and appearance.

4.1.2 There shall be no oil leakage at any mating surfaces, oil seals, bolt holes, etc. of the wheel side drive axle.

4.1.3 All electrical components, connecting wires and connectors on the wheel side

drive axle shall be securely fixed and well protected.

4.1.4 The wheel side drive axle shall rotate freely without any abnormal noises (such as friction between the stator and rotor, periodic abnormal noises, abnormal noises after damage to gear bearings, etc.) or jamming.

4.1.5 The wheel side drive axle shall function normally under the following conditions.

a) Operating temperature. -40°C~55°C;

b) Operating humidity. 5%~95%.

4.2 Performance requirements

4.2.1 Bridge performance

4.2.1.1 Vertical bending stiffness

The test shall be conducted according to the method specified in 5.3.1.The maximum deformation per meter of wheel track of the integral wheel side drive axle shall not exceed 1.4 mm.

4.2.1.2 Vertical bending static strength

The test shall be conducted according to the method specified in 5.3.2.The reserve factor for the vertical bending static strength of the integral wheel side drive axle shall be greater than 6.

4.2.1.3 Bridge fatigue

The test shall be conducted according to the method specified in 5.3.3.The fatigue life shall meet the following requirements.

a) Integral wheel side drive axle.

1) Vertical bending fatigue life shall not be less than 8 × 10^5 cycles;

2) Braking fatigue life shall not be less than 8.8 × 10^4 cycles;

3) Transverse bending fatigue life shall not be less than 2 × 10^5 cycles.

b) Disconnected wheel side drive axle

1) The fatigue life of the bridge body shall not be less than 8×10^5 cycles;

2) The suspension system shall meet the requirements of 5.7 in JT/T 1359-2020.

4.2.2 Static torsional strength

The test shall be conducted according to the method specified in 5.3.4.The static torsional strength reserve factor shall not be less than 3.

4.2.3 Air tightness

The test shall be conducted according to the method specified in 5.3.5.The change in gas pressure shall not exceed 20 Pa.

4.2.4 Dynamic sealing

The test shall be conducted according to the method specified in 5.3.6.There shall be no oil leakage at any mating surfaces, oil seals, bolt holes, etc.

4.2.5 High-speed performance

The test shall be conducted according to the method specified in 5.3.7.There shall be no oil leakage during or after the test. Furthermore, bearings, gears, oil seals, and other parts shall not show signs of burning or damage that would affect the normal operation of the wheel side drive axle.

4.2.6 Overspeed performance

The test shall be conducted according to the method specified in 5.3.8.There shall be no oil leakage or abnormal noise during or after the test. Furthermore, bearings, gears, oil seals, and other parts shall not show signs of burning or damage that would affect the normal operation of the wheel side drive axle.

4.2.7 Temperature rise performance

The test shall be conducted according to the method specified in 5.3.9.The oil temperature shall be stable at a certain temperature for more than 30 min. It shall not exceed the maximum allowable temperature. The temperature-time curve shall be smooth without abrupt changes.

4.2.8 Transmission fatigue life of wheel side reducer assembly

The test shall be conducted in accordance with the method specified in 5.3.10.After the test, the main components shall not be damaged, such as fracture, severe pitting on the tooth surface (pitting area exceeding 4 mm2 or depth exceeding 0.5 mm), peeling, bearing jamming, abnormal noise, etc.

4.2.9 Cleanliness

The test shall be conducted according to the method specified in 5.3.11.The cleanliness of the drive axle shall be tested without disassembly. The ratio of the total amount of impurities in the lubricating oil to the rated amount of lubricating oil shall not exceed

50 mg/L.

4.2.10 Efficiency

The test shall be conducted according to the method specified in 5.3.12.The maximum efficiency of the wheel side drive axle shall not be less than 92%. The operating efficiency shall not be less than 85%.

4.2.11 Noise

Conduct the test according to the method specified in 5.3.13.The noise level shall not exceed 85 dB(A).

4.2.12 Protective performance

The test shall be conducted according to the method specified in 5.3.14.The wheel side drive axle shall meet the IPX7 requirement specified in GB/T 4208-2017.

4.2.13 Salt spray resistance

The test shall be conducted according to the method specified in 5.3.15.The salt spray test time shall not be less than 240 h. No red rust shall form on the product after the test.

4.2.14 Drive motor performance

4.2.14.1 The mechanical impact test requirements for the drive motor shall be conducted according to the method specified in 5.3.16.After the test, the drive motor components shall be undamaged. Fasteners shall be secure. The motor insulation resistance and withstand voltage shall meet the requirements of GB/T 18488.

4.2.14.2 Except for mechanical shock requirements, the performance of the drive motor

shall meet the requirements of GB/T 18488.

4.2.14.3 Conduct the test according to the method specified in 5.3.14.The drive motor

shall meet the IP68 rating requirements specified in GB/T 4208-2017.

5.1 Test preparation

5.1.1 Accuracy requirements for testing instruments

The accuracy class or maximum permissible error of the testing instruments shall not be lower than the requirements in Table 1.For instruments measuring electrical parameters, they shall be able to meet the corresponding DC and AC parameter measurement accuracy and waveform requirements.

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