The Use Of Sealing Ring On Automobile Wiring Harness

The Use Of Sealing Ring On Automobile Wiring Harness

More and more attention is paid to the durability and reliability of auto parts. As a protective material, rubber parts are widely used in automobiles. The importance of sealing rings is self-evident, especially for the wiring harness protection of the engine compartment and the lower chassis of the car. Because usually, these two places are more likely to be in a harsh environment. There is a concept of "wet zone" that needs to be known. Generally speaking, we call the "wet zone" the area where the engine compartment and the lower part of the car are exposed to the air and often affected by rain and water. Correspondingly, the cockpit and luggage boxes and other parts are basically not affected by rain, this part is called the "dry zone".

One of the biggest functions of the harness seal ring is to isolate the wet zone and the dry zone. This is an application. The common part is to install one between the engine compartment and the cockpit to separate the dry zone from the wet zone; The rear-wheel ABS wiring harness needs to be equipped with a sealing ring, specifically under the rear seat (such as golf). There is a sealing ring separating the inner and outer parts to ensure that the water at the bottom will not leak into the cab during driving;

Each qualified wire harness seal will be tested for hermetic sealing to ensure that the sealing ring on the wire harness can play a role.

The electronic appliances and wiring harness in the dry zone are less affected by high temperature/high humidity and chemicals/dust. The wet zone is just the opposite. If the seal is not good, it may cause water in the appliances and wiring harness, causing internal circuit short circuit/corrosion, etc., which will directly lead to functions failure, this requires the connector plug of the wiring harness to be sealed and protected.

There are two main ways for electronic components such as connectors to enter the water. The first is that external liquid penetrates into its interior by gravity, such as connectors without sealing rings, or moisture from the internal connection points of the wiring harness (such as unprotected solder joints). /Crimping point/grounding point) enter; here is the emphasis on the word "siphon", because general electrical appliances have a certain temperature when working, and the internal air forms a certain pressure. When the work stops, the temperature drops and the internal pressure is also small. If the connector is not well sealed, water vapor will enter the interior along the gap between the multiple strands of copper wires, resulting in functional failure; therefore, the connector in the wet area generally requires a sealing ring (pad).

For the sealing test of the connector, the general wiring harness manufacturer is integrated into the electronic test bench, and the test module corresponding to the connector will have its own sealing test, and also give it a rated pressure value, while testing its continuity, we also test sealing performance.

The sealing ring is a very important part of the wiring harness. Its quality is directly related to the function of the wiring harness. Whether it is directly used on the wiring harness or in the connector, I have encountered problems. , The direct cause is the use of materials to cut corners or improper handling of the rubber in the vulcanization process; the connector is usually because the internal sealing ring is not assembled in place, and the whole is not on the same plane to cause air leakage; find the root cause of the problem as soon as possible, and take preventive measures Is what we wire harness practitioners should consider.

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