Analysis of water ingress

Although the wiper motor sparrow is small and has all the internal organs, it is a relatively complicated system. It is usually assembled from motor housing, rotor, reduction gearbox, output shaft, cover and other parts. Throughout his life, his main job is to deal with water.

When the wiper motor is working, the internal temperature can reach 90 degrees Celsius, and after it stops working, it quickly drops back to about 30 degrees Celsius at room temperature. The resulting pressure difference between the inside and outside of the motor will draw external moisture into the motor and cause the motor to malfunction. Therefore, the tightness requirements of the motor are relatively high. Generally, the waterproof level of the wiper motor is IP4K, and the rain test requires a flow of 15L / MIN and a water pressure of 400KP.

In order to ensure that the above requirements are met, all wiper suppliers will perform a 100% air-tight inspection after the motor is assembled to ensure that the motor is tight. If you're doing a supplier site audit, you might want to pay attention to this.

The repeated "heating-cooling" of the motor causes the entire wiper motor to be under negative pressure.

During the after-sales use process, the waterproof function of the motor is constantly declining, and eventually rainwater will enter the motor from the weakest place.

Poor quality waterproof and breathable membranes are easily damaged, water ingress, and dust accumulation during long-term use, which will lead to mildew inside the product and line failure.

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