QC/T 1022-2015Technical specifications for reduction gearbox assemblies of battery electric passenger cars (English PDF)

3.1 Positive rotation

The reducer is installed as specified. When the vehicle is advanced, the rotation direction of reducer input shaft shall be positive rotation.

3.5 Differential rate

The ratio of the differential output at both ends of the speed difference to the differential input speed

3.6 Coast

The mode that the reducer continues to operate under inertia when it cuts off the reducer input power

5.1 Basic requirements

5.1.1 The reducer shall comply with the requirements of this Standard and shall be manufactured in accordance with the prescribed procedures for the design of the product drawings and technical documents.

5.1.5 Each movement part shall be flexible, without hysteresis.

5.1.6 There shall be no debris that affects the cleanliness of the reducer.

5.1.7 Reducer resistance to salt spray capacity shall be able to meet the relevant provisions of GB/T 10125. The test period shall not be less than 48 h.

5.2 Bench test requirements

5.2.1 Dynamic sealing performance

During the test, the seals shall not have "drops" of oil leakage.

5.2.5 Transmission efficiency Integrated

transmission efficiency shall be not less than 95%.

5.2.6 Differential reliability

After completing the differential reliability test, the differential shall be flexible and no hysteresis.

5.2.7 High speed performance

There shall be no oil leakage during the test period. And bearings, gears, oil seals and other parts shall not be ablated or damaged to affect the normal operation of the reducer.

5.2.8 Over-speed performance

During the test, there shall be no leakage of oil, abnormal sound phenomenon. And bearings, gears, oil seals and other parts shall not be damaged to affect the normal operation of the reducer.

5.3 Cleanliness

The total amount of impurities in the reducer shall not exceed 50 mg per liter.

6.1 Assembly test

6.1.1 The output of the reducer, the position of the input and the size of the connection with the vehicle shall meet the design requirements.

6.1.2 Visually inspect the appearance of the reducer. It shall be free of dirt, corrosion and oxidation.

6.1.6 Cleanliness test shall be performed in accordance with QC/T 572,

QC/T 573 and QC/T 575.

6.1.7 Salt spray test shall be carried out in accordance with the provisions of GB/T 10125. The exposed area shall not be less than that in the installed state of the vehicle. The duration of the test shall not be less than 48 h.

6.2 Bench test method

6.2.1 The test shall be carried out according to the requirements for bench test of this Standard or purchaser.

6.2.2 Equipment

6.2.4.3 High temperature performance test

6.2.4.7 High speed performance test

6.2.4.9 Static torsion strength test

a) Test conditions.

1) the output shaft is fixed and the input shaft torsional speed does not exceed 15 r/min;

2) the input shaft and output shaft are only subjected to torque and are not allowed to have additional bending moments;

3) the working surface of the gear is the same as the positive drive conditions. b) Test steps.

1) turn the reducer positive and load it until it is damaged or reaches the specified torque; then unload it to 0; record the input torque and the corner of the input shaft when the damage occurs or when the specified torque is reached;

2) detect one point for each one; detect three and take the minimum value.

c) Test results. calculate the torsional strength reserve factor K1 according to equation (2). where, M - torque recorded at the end of the test; Memax - maximum input torque.

6.2.4.10 Loading noise test

6.2.4.11 Gliding noise test

7.1 Exit-factory inspection

The reducers shall be able to leave factory after they are inspected as qualified according to the exit-factory inspection requirements of manufacturer. The exit-factory inspection requirements shall be carried out according to the technical documents stipulated in this Standard or agreed by the supplier and the purchaser. The inspection items shall contain the contents of 5.1 of this Standard (but not limited to).

7.2 Type inspection

7.2.2 Type inspection sample shall be extracted at random from exit-factory inspection qualified products according to GB/T 2828.1.3 samples for each inspection item. The samples after completion of the fatigue life test or the static torsion strength test can not be used for other test items. Samples after completion of high-speed performance tests can not be used for fatigue life test items. Samples that do not fail after completion of other test items can be used for tests other than the inspection item.

7.2.4 Determination rules […]

8.1 Marks

8.1.1 Product marks

8.2 Packaging

8.2.1 Reducer packaging shall be dustproof, waterproof.

8.2.2 Packaging box shall be firm. The reducer shall be reliably secured in the box to ensure that it does not bump and damage during normal transport.

8.2.3 When reducer leaves factory as an accessory, it shall be packed with packaging box. When reducer leaves factory as a package product, the packaging and transport methods shall be determined by the supplier and the purchaser.

8.3 Transport

During transport, it shall cover the packaging box and prevent the reducer from bump and damage.

8.4 Storage

The reducer shall be stored in a ventilated, dry, rainproof, sunscreen warehouse. It shall not be stored with the flammable materials, chemical corrosion and other items. […]