Air Leak Test on Gear Box

Air leak test method (air mass flow or pressure decay) is generally an appropriate method to meet customer leakage test requirements.

In this case, once the part has been sealed through a special sealing equipment, the test is carried out with a specific and customised sequence of different tests using several instruments. Some gearboxes are very complex, in some cases 25/30 different circuits have to be tested.

The test sequence and measurement circuit are studied and customised for each part type. The number of instruments required for the complete test sequence depends on the machine cycle time and the number of circuits to be tested.

The complexity of the measurement cycle is also related to the different rejection levels. Typical maximum leakage allowed from internal to external is generally around 1cc/min, but on the same circuit an internal leakage of up to 200cc/min is also accepted, so multiple tests on the same circuit are required to ensure a complete and reliable test.