1. The windshield is large, and the wiper strip needs to be long to ensure that the clean area of the windshield is suitable, and there is only one vertical stress point for the boneless wiper. Therefore, it is difficult to ensure that the end does not tremble, and this tremor is an important factor for abnormal noise
2. Exhaust gas pollution causes many irregular-sized oil films on the glass surface that are not easy to see. The areas with oil films can be scraped smoothly, and the areas where there are no oil films will be very dry, and those oil films will also become dusty particles. Astringent, affecting the smoothness of the scraper on the glass
3. The aging blade will bend and harden to a certain extent, which is also an important factor that causes sound. The aging blade (because the vertical wiper arm pressure causes the blade to deform) when it is in contact with the glass, the deformed wiper blade at this time, plus the irregular oil film on the glass that is not easy to remove, and other interference factors are directly As a result, the scraper will easily “jump” on the glass surface and then vibrate irregularly. The direct result is noise.