Maybe many children’s shoes are found

Many cars will have a bulge in the center of the rear seat

This bump is high or low

Will affect the ride comfort

Normally，The bulge in the rear row is because the chassis below has to pass the exhaust pipe、Brake pipe pipeline or drive shaft，For the smoothness of the chassis，So there is such a bulge in the middle of the back row，Sacrificing interior space。

The middle between the front and passenger seats of the car is raised from front to back，It is a structural design，The purpose is to improve the longitudinal rigidity of the carriage，At the same time, it also leaves space for the exhaust pipe to move backward so that it will not affect the chassis passability。

Rear-drive because the drive shaft needs to go from the engine compartment Seabetto the rear axle，And considering the up and down bumps and left and right swings of the rear axle (There is a universal joint on the drive shaft)，Its requirement for passing space will be greater than that of the precursor，So，The bump on a rear-wheel drive car is much wider than that on a front-wheel drive car。

Generally, rear-wheel drive cars will have such a raised place in the back，Because both the drive shaft and exhaust pipe require this space。Front-wheel drive cars generally only have exhaust systems，So it will be much lower，Some are even flat。But some businesses make a raised chassis in order to save production costs，So don’t be surprised if you see bumps on front-wheel drive cars。If it is a four-wheel drive vehicle of the same version，The protruding height of the rear row will be relatively higher。As for SUV、MPV model，Because their chassis is higher，No need to leave space for the exhaust system，So there is no need for this bump。

This is related to the design concept。The raised ones do not necessarily have steel beams，No bulges does not mean there are no steel beams。Let’s talk，Questions about the bulge in the rear row，Four words can solve it-"Design Concept"。Some A-class cars，Perhaps it was designed with the owner using the car alone，There are few people sitting in the back row、Less when sitting with three people，So even if it is a front-wheel drive car, it does not care whether the rear bulge is too high。And some mid-level cars，Considering that three people may sit in the second row，So try to keep it as low as possible。At the same time，This is related to seabet appdomestic and foreign design concepts，The height of the bulge is to pursue the balance of design。

The "bump" at the foot of the rear seat is not for safety reasons，This “bump” has little to do with the strength of the frame。Frame strength is a very complete concept，Generally at the beginning of vehicle design，The manufacturer has fully considered the issue of frame rigidity，Instead of compromising the rigidity of the frame for the sake of the "bulge" of the rear seats。

Give a common example, The "bulge" in the center of the rear seats of the Camry brand is relatively flat，The Accord’s “bulges” are larger，But there is no data to confirm it Accord’s crash safety is much higher than Camry，Maybe it proves that Accord’s frame is much stronger than Camry。

There is generally only one major drawback to the flat rear platform，That is, the position of the exhaust pipe will be lower，Affects passability，People who often run bad roads should know this。

Whether the rear row is convex or not, there is a reason for its existence.

The exhaust pipes of some models are embedded in the chassis

The exhaust pipe of some models is outside the chassis

Flat inside , it’s not flat outside,

It’s flat on the outside, but bulging inside,

As for what is reasonable, benefactors have different opinions.

Not convex, the middle passenger in the back seat will be more comfortable without having to split his legs,

convex，Generally the chassis will be lower，Lower center of gravity，Good for control。