Analysis of structural design of Teflon spraying

Analysis of the problems in the design of Teflon spraying structure: except for one vehicle with local protection at the lower part of the engine, the other five vehicles have no protection measures. When the test vehicle passed through the salt water tank, the engine compartment was directly affected by salt water, and the engine gear train, generator, starter, air conditioning reservoir, power steering pump and oil return pipe of steering system, clutch master cylinder connecting pipe, fan motor, horn, air conditioning control device, oil filter, radiator and condenser were seriously corroded or failed. We noticed that the bottom of the engine of new models such as Shanghai Volkswagen Passat B5 and FAW Volkswagen Audi A6, which came to our Institute for reliability test, was sealed tightly, and the interior of the engine compartment could not be seen at all, which represented the advanced level of foreign automobile anti-corrosion design at present. There is no sealing strip between the door and the door frame of the six vehicles. When the door is closed, the door lock can be seen directly from the outside. When salt spray test is carried out on the test vehicle, salt water can be sprayed directly on the door lock, so the door locks of all test vehicles fail due to rust. New models such as Passat B5, Audi A6 and Bora all have 1-2 layers of sealant strips.

The glass lifter cable and hand brake cable of 6 vehicles are all bare steel wires, which result in the failure of glass lifter and hand brake due to corrosion. The accelerator cable of several vehicles was also an exposed steel wire, and one of them was rusted and broken at 19 cycles. In fact, as long as the cable is covered with a layer of plastic protective film, its anti-corrosion ability can be doubled, and the cost can not be increased much.

The position of the parts also has a great influence on the anti-corrosion ability. In all six vehicles, the generator and starter arranged in the lower position have many times failed due to rust, while the generator and starter arranged in the higher position have much less failure due to rust. The wiper motor and horn are lack of protection, and the corrosion is serious. Some motors are burned and some horns are invalid. The structure design of the brake is different, so is the anti-corrosion level. Some prototype vehicles adopt nested structure (there are grooves on the brake drum), salt water is difficult to enter, and the brake has no corrosion until the end of the whole test; However, the brake with common structure has serious corrosion and even failure.