Perhaps many children's shoes discover

Many car back seats will have a convex

This convex is high or low

All will affect the comfort of riding

Usually under the circumstances，The protrusion of the rear row is because the chassis below must pass through the exhaust pipe、brake pipeline pipeline or drive shaft，For the flatness of the chassis，So there is such a protruding in the middle of the rear row，Sacrifice the space inside the car。

The car is raised between the front and the back of the car，Is a structural design，The purpose is to improve the rigid strength of the vertical of the carriage，At the same time, it will also leave the exhaust pipe backward to leave the space to make it not affect the passability of the chassis。

Rear drive is from the engine compartment to the rear bridge due to the transmission shaft，Considering the upper and lower bumps of the rear bridge and the left and right swing (There are universal sections on the drive shaft)，Its requirements for passing space will be larger than the front -drive，So，The protrusion of the rear -drive car is much wider than the front -drive。

Generally there will be such a raised place in the rear drive of the rear drive，Because the transmission shaft and the exhaust pipe require this space。Aterior drive here generally only the exhaust system，Therefore, it will be much lower，Some are even flat。But some merchants make a raised chassis in order to save production costs，So if you see the front -wheel drive, you don’t have to be too strange if you are raised。If it is the same version of the four -wheel drive car，The protruding height of the rear row will be relatively higher。As for SUV、MPV models，Because their chassis is higher，No need to leave space for the exhaust system，Therefore, no need for this bump。

This is related to the design concept。The raised may not have a steel beam，No raised does not mean that there is no steel beam。Let's go，Questions about the protruding question of the rear row，Four words can solve- "Design Concept"。Some A -class cars，It may be considered as a car owner when designing.，Few people sit in the back row、Sitting less when you are sitting three people，So even the front -drive car does not care if the rear bump will be too high。and some intermediate cars，Considering that the second row may sit three people，So try to get as low as possible。At the same time，This is related to the design concept at home and abroad，seabet appThe raised height is to pursue the design balance。

This "protruding" at the foot of the rear seat is not available for safety settings，This "raised" and the strength of the frame is not much related。The strength of the frame is a very complete concept，Generally at the beginning of the vehicle design，The manufacturer has fully considered the problem of the rigidity of the frame，instead of "raised" the rear seats, how much to accommodate the rigidity of the frame。

For a more common example, The "raised" in the rear seat in the rear seat of the Camry brand is relatively flat，And the "raised" drum bag of the account is larger，But there is no data confirmation The collision safety of account is much higher than Camry，or prove that the frame of ACCORD is much higher than CAMRY。

The rear floor is generally flat. Generally, there is only one big disadvantage，The location of the exhaust pipe will be compared with，Impact passability，Those who run badly should know this。

rear row convex and non -convex, all have the reason for its existence.

The exhaust pipes of some models are embedded in the site

Some models exhaust pipes outside the chassis

The flat , the outside is not calm,

The flat outside, the car is raised,

As for which reason, the benevolent sees benevolence.

Not convex, the passengers in the back row do not need to split, it will be more comfortable,

convex，General chassis will be lower，Site heart low，Good for control。