Brother, what is the protrusion on the hood in front of the car?

I guess it's the air intake of the turbocharger.

Structure A turbocharger is a machine composed of a turbo chamber and a supercharger, the turbine chamber air intake is connected to the exhaust manifold, and the exhaust port is connected to the exhaust pipe; The supercharger intake is connected to the air cleaner duct, and the exhaust port is connected to the intake manifold. The turbine and impeller are housed in the turbine chamber and the supercharger respectively, and they are rigidly connected coaxially.

Principle A turbocharger is actually an air compressor that compresses air to increase the amount of air to be intake. It uses the inertia impulse of the exhaust gas discharged by the engine to push the turbine in the turbine chamber, and the turbine drives the coaxial impeller, and the impeller pressurizes the air sent by the air filter pipe to pressurize it into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase synchronously, the impeller compresses more air into the cylinder, and the pressure and density of the air increase to burn more fuel.

Technology The turbocharger is installed on the intake and exhaust manifold of the engine, and is in the working conditions of high temperature, high pressure and high speed operation, its working environment is very harsh, and the working requirements are relatively harsh, so the materials and processing technology of the manufacture are very high. Among them, the most difficult to manufacture is the "floating bearing" that supports the operation of the turbine shaft, which can reach a working speed of more than 100,000 revolutions, plus the ambient temperature can reach.

Six or seven or more, by no means the general bearing can bear, because there is oil between the bearing and the inner wall of the body for cooling, also known as "full floating bearing".

In addition, although the turbocharger has the effect of assisting the engine to increase the force, it also has its disadvantages, the most obvious of which is the "hysteresis response", that is, due to the inertia of the impeller, the slow response to the sudden change of throttle, even after the improvement of the reaction time is seconds, so that the engine delay increases or decreases the output power. This can be a bit of a stretch for a car that is about to accelerate or overtake suddenly.

But the turbocharger is a non-profitable thing after all, it works from the exhaust gases of the engine, and the energy of these exhaust gases will be wasted if it is not used. Therefore, since the advent of the turbocharger, people have often carried out technical modifications to it, such as improving the machining accuracy and minimizing the gap between the turbine and the turbine interior wall, so as to improve the exhaust gas energy utilization; Using a new material ceramic, the advantages of high heat resistance, strong stiffness and light weight of ceramic can make the turbocharger more compact, less volume, and reduce the "lag response" time of the turbine.

In the last 30 years, turbochargers have been popularized in many types of automobiles, it makes up for the inherent shortcomings of some naturally aspirated engines, and the engine can increase the output power by more than 10% without changing the working volume of the cylinder, so many automobile manufacturing companies have adopted this supercharging technology to improve the output power of the engine, so as to achieve the high performance of the car.

Turbocharged air intakes.

The first thing you see is the engine, and if the engine is transverse, you can also see the gearbox. The water tank, condenser, and cooling fan are close to the front of the car. Peng swelling pot.

Brake vacuum accumulator. Brake oil cans. Air conditioning compressor.

Dynamo. Direction booster. Transmission belts.

Individual tensioners. ABS Master Pump. There are also solenoid valves, check valves, injectors, inductors, various wiring harnesses and so on.

I've just given you a rough idea, you can go to the bookstore.

It depends on what kind of car it is, some cars have a front-engine, some have a rear-engine, and the front hood has: engine, water tank, antifreeze, and electrical circuits.

Includes: cylinder block, crankcase, cylinder head, cylinder head gasket, OHV, knock sensor, platinum spark plug, overhead camshaft, distributor, cylinder line, piston, spark plug, mechanical filter, throttle, thermostat, cooling system, fuel injector, balancer shaft.

First, this kind of car generally has a large displacement, and a large displacement also means that the engine is easy to overheat. Therefore, some of the protrusions are the air intakes of the cooling system, and the protrusions are designed to allow better airflow into the car when the vehicle is moving forward, and the engine heat is carried out.

Second, it is designed for visual impact, fits the whole, and looks more domineering and hideous.

3. Some protrusions are due to the need for built-in accessories in the car.

Fourth, under the bulge is the air filter. Generally speaking, (not decorative) cars with this air intake are equipped with exhaust turbo gas, because the turbocharger needs more air when it works, and opening this opening is to let more fresh air in.

Some models are like the guy upstairs said, some are purely decorative, and they can also play a role in cooling heat in the engine compartment!

Air intake, raised underneath is the air filter.

The role of the two protruding flutes on the hood of the car:

Now the hood of the car has a convex or concave piece, so as to form two lines on the hood, these two lines are the stiffeners of the plate, which are used to increase the strength of the steel plate. If you press on a relatively large area of iron plate, without such stiffeners, the pressure will cause the concentration of stress, and it will sink at the stress point, which feels very "soft". But if you have this stiffener, it will not be so easy to sink, deform, and feel more "hard" when pressed.

Therefore, it is used to increase the degree of resistance to deformation.

Hood: Made of rubber foam and aluminum foil, it can isolate the heat generated by the engine while reducing engine noise, effectively protecting the paint surface on the hood surface and preventing aging.

One is for aesthetics, so that the front face of the car can see different lines, and the other is some aerodynamic relationship.

3 is that some engine compartments are too full. You have to warp up a little.

Plays the role of a skeleton! Because the gas car is wrapped in iron sheets. If you don't have a skeleton, it's easy to defend. It's not pretty. Nor is it secure.

In the process of structural design, the overhanging surface of the structure may be too large, or the span is too large, in this case, the connecting surface of the structural part itself can bear a limited amount of load, then a reinforcing plate is added on the common vertical plane of the two combinations, commonly known as the reinforcing rib (pronounced jin rib in engineering), in order to increase the strength of the joint surface.

In order to improve the structural strength of the hood, the second consideration is aesthetics! It's a mechanical design!