About the installation of rear wipers for sedan and hatchback

When it comes to car wipers, in fact, many people will understand its function, and also know that it is a device that brings a cleaning effect to the car's foreground glass. As a component of an automobile, this device is composed of a steel wiper blade, a wiper motor, some connectors, and a shell. When it comes to this kind of wiper, many people will ask why hatchbacks have rear wipers, but most sedans do not? Why is that?

    This is a question about fluid mechanics. When the car is driving, the space of the car squeezes out the corresponding size of air. The car is moving. After the air is discharged, the air cannot quickly fill the car's exhaust due to the viscous nature of the fluid space. So a vacuum is formed at the rear of the car, thus forming a vortex. In a rainy day, rainwater is mixed in the airflow on the roof, and muddy water is mixed in the airflow under the car, so that a lot of impurities are mixed in the vortex generated at the tail. Since the roof of the sedan is more rounded, it will not produce eddy currents at the tail window, but at the rear trunk with a relatively large surface change. Therefore, we usually see the bumper at the rear of the sedan on rainy days. It was full of mud, and the rear window was clean. Since the hatchback suddenly encounters a vacuum area when the airflow passes through the rear end of the roof, the airflow will immediately form a vortex at the tail window. The muddy water entrained in the vortex will naturally splash on the rear window, blocking the view and causing safety hazards. Therefore, for safety and convenience in rainy days, a rear scraper is installed on the hatchback. This is not necessary for sedan. This is the main reason why the rear wiper cannot be installed.

This article is original by the wiper motor manufacturer, please indicate http://www.c-eu.cn/