Hello everyone, this is a column focusing on car repair and maintenance. There are car secrets you don’t know here, and it will teach you how to avoid big pits on the road to car maintenance. I believe that not only you, but also many people have a certain hazy feeling about the automotive aftermarket. Here will help you uncover the unknown stories of car repair and maintenance.
There are many cars in the world and many car owners in the world. Many people will find a problem, that is, almost all sedan cars have no rear wipers, while the rear wipers of some MPVs, SUVs, hatchbacks and hatchbacks are almost a must-have configuration for cars.
This issue of Xiaobian will take you to understand the cold knowledge of cars: Why does the sedan have no rear wipers?
There are many sedan cars in the world, whether they are Japanese, American, European, or various car brands. Looking at the world’s sedan cars, it seems that there are no models with rear wipers. Even if there are, it is rare, and the proportion is almost negligible.
There are really too many models with wipers, such as the Audi A4 allroad in front of you.
You can also see the huge wipers in Chery’s flagship SUV model, the Tiggo series.
You can see the wipers on Ford’s Focus series.
All of the above categories of models have one characteristic, that is, the rear of the car is short enough, and the car glass and the tailgate are integral. Moreover, the glass of the tailgate has a relatively large angle with the ground, and they are closer to standing upright on the ground.
The angle of the tailgate glass of the sedan is very flat, the angle with the ground is small, and the tail is smoother. Don’t underestimate this gap. This is the fundamental reason why sedan cars don’t use wipers!
Let’s take a look at a picture. When a car is moving, the different airflow trends of the car body lead to different negative pressure areas at the rear of the car. The negative pressure areas of some models such as SUVs will be obviously larger.
Negative pressure means that when the car is driving, the air at the rear of the car is quickly evacuated, causing a vortex, and dust on the ground will be carried to the rear of the car by the vortex. So you will find that there is usually a lot of dust on the back of a car, and it is especially dirty, which is why.
The tailgate glass of sedan cars is not in the negative pressure zone and is difficult to get dirty, while the tailgate glass of similar models such as SUVs is in the negative pressure zone, and the glass is easily adhered to dust. The main function of the rear wiper is to remove this dust, not to scrape rain at all.
Of course, not all such models are equipped with rear window wipers. In order to reduce certain costs, some commercial vehicles have to cancel the rear wipers.
What should I do if there is fog on the glass without the rear wiper?
Engineers have long come up with a solution, which is to design heating wires on the rear window glass. The only purpose is to remove the fog on the glass to ensure a certain visual effect.
This knowledge is indeed a bit cold. Although Xiao Bian graduated from automotive engineering, he only learned this secret after he really entered the industry. There are many cold knowledge about cars, but wipers are just one of them. There are more interesting and interesting knowledge to share with everyone!
BradleyBenjamin 
6 
September 13, 2024 
