What is Chassis? Car chassis types and chassis components

What is Chassis? Do you already know what a car chassis is? The chassis is a very important part of the car. If there is no chassis, the car cannot support all the weight in it. This would definitely be bad for a car. Chassis is made up of various components in a car that you will be familiar with for a long time.

Springs and transmissions are among the components of the chassis. The two parts, of course, are already known by many people and are very familiar.

Not only these two components, but there are other chassis components that are commonly known but do not yet know that these components are part of the chassis. If you are still curious about what a chassis is, let’s see the explanation below!

What is Chassis?

Chassis is the vehicle’s main support structure, also known as the ‘Frame.’ It bears all the stresses on the vehicle in both static and dynamic conditions. In a vehicle, it is analogous to the skeleton of a living organism.

What is Chassis

The origin of the word Chassis lies in the French language. Whether it is a two-wheeler or a car, or a truck, every vehicle has a chassis-frame. However, its form, obviously, varies with the vehicle type.

Functions and Important of a Chassis in a Vehicle

The following stated below will enlighten you more on the functions and importance of a chassis frame.

  • It provides space for mounting other necessities like the engine, brake, etc. to the vehicle.
  • It supports and bears the load of the vehicle.
  • The chassis withstands the stresses arising due to bad road conditions.
  • It also withstands stresses during braking and acceleration of the vehicle.

Commercial vehicles manufactured as of 2015 till date are made of light metal materials, especially sports cars for fast speed. The chassis on them are still made sturdy for proper balance.

A rolling chassis is a frame with complete parts attached to it, to get it ready in working condition. When, an engine transmission system, axles, tires, etc. are fitted to a chassis it is known to be a running chassis or running gears.

How Is a Chassis Made?

Depending on the vehicle and its purpose, the chassis can be made from materials such as carbon steel, aluminum, or even carbon fiber. The weight, rigidity, and costs all play a part in how and why a material is selected for use in a chassis, too.

Carbon fiber is extremely lightweight and rigid, but is too expensive to be used in all but the most focused applications. The construction process also depends heavily on the material, as mainstream metals like aluminum or steel can be rolled and welded in a production line setting, but specialty materials like carbon fiber may require complex hand-molding and construction.

Car Chassis Types

The following is a discussion of the types of car chassis, which contains information about ladder frames, monocoque chassis, backbone chassis, tubular space frames, to aluminum space frames.

Ladder Frame

Ladder frame is a chassis that looks like a ladder. Despite its unique shape, this chassis is perfect for use as a base for car engine mounts and other components. This chassis is usually made of symmetrical steel with a beam shape that is in certain parts. This section is reinforced with additional joints and cross members. This one chassis is usually used in SUV cars.

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Monocoque Chassis

Monokok chassis is a chassis that blends with the car body. The part that is included with the chassis is the outer part of the car body which is used to protect the cabin space from collisions.

The chassis is usually made of reinforced composite steel so that it can be the frame of the car body. Chassis material has the main requirement, namely the material must be strong to be able to support the load of the vehicle.

Backbone Chassis

The backbone chassis looks similar to a single main skeleton. Its position will cross along the center of the car so as to make the front and rear of the car connected. A backbone chassis can also be referred to as a single chassis. This chassis has quite a few drawbacks, such as its high price.

Tubular Space Frame

Tubular space frame is a chassis in the form of a steel pipe so that it can directly shape the car according to the construction. The strength of this one chassis will depend on the quality of the welded joints on the chassis. This chassis is considered the best, thanks to its durability. This advantage resulted in this one chassis being often used in racing cars.

Aluminum Space Frame

The aluminum space frame is a chassis similar to the monocoque but uses aluminum. Meanwhile, monocoque chassis usually use steel plate sheets. This chassis has a lighter weight when compared to the monocoque.

Car Chassis Components

The following is a discussion of the components of the car chassis which is divided into 12 parts.

What is Chassis


The first component in the car chassis is the clutch, which serves to connect and disconnect the engine speed to the transmission gently. Clutch is useful when you are running the car or are in a traffic jam.

The clutch can make the gearshift process smoother. This component consists of two metals that rotate at RPM, namely the flywheel and pressure plate and the clutch lining is between these two parts.

When the pressure plate presses against the flywheel, the clutch lining will be pinched and the engine speed will be connected to the transmission. However, in the automatic clutch system, the clutch will work according to the fluid pressure force. This force will continue to grow as the engine speed increases, so manual clutch operation is not required.


Transmission is a car chassis component that functions to manipulate engine output. This section is very useful when the car is in a condition that requires large torque or is in a condition when the car has to put out a high speed.

The car’s transmission can help perform these activities by adjusting the ratio of the displacement between the gears. Position 1 has a gear ratio that is large enough so that the transmission output rotation will be smaller than the transmission input. However, position one has a very large torque.

After entering 2nd gear or other gear, the gear ratio will be smaller and this will make the output acceleration rate bigger but the maximum torque will decrease.

The transmission has torque that is inversely related to engine RPM. Same with the clutch, the transmission also has an automatic version. This version can adjust the gear ratio according to the speed of the vehicle so that the driver only needs to focus on driving the car.

Universal Joint

The components that are between the transmission and the rear axle of the car must have an unequal height because the axle is under the suspension while the transmission is on the car body. This makes the car need additional components so that the propeller can function without experiencing interference.

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What is Chassis

Universal joint is a component in the car chassis whose function is to connect torsional moments from any direction and angle. Usually there are two parts of this which are located behind the transmission and front axle.


The axle is a car chassis component whose function is to distinguish the left and right wheel rotations. This must be distinguished so that when the car turns to the left, the distance traveled by the left and right wheels can be adjusted. If not distinguished, then one of the wheels can slip and cause wear.

Rear Axle

This component has the shape of a shaft that will connect the axle with the axle. At the end of the axle, a wheel bearing will be attached to the axle bearing the car body. There are two kinds of axles used in cars, namely rigid axles and independent axles.

In the rigid axle, when one wheel is affected by the suspension effect, the other wheel will be affected. Meanwhile, on the independent axle, there are flexible joints that are attached to both ends of the axle so that the left and right wheels can be freed when one of them is affected by the suspension effect.


Springs are also part of the suspension system. The function of the spring is to dampen road vibrations and provide softness when the car passes through potholes. Springs are usually made of flexible steel with a threaded design.

This part has good damping power so it is often used in cars for independent suspension systems. There is also a leaf spring model which is a sheet-like flexible steel. This model has better strength than threaded springs, so it is more widely used for cars with heavy weights.

Shock Absorber

Shock absorbers are different from springs. It has no resistance to incoming pressure. However, this component can absorb the shock that arises when the spring is working.

This happens when the car passes through a pothole and the pressure that appears is held by the spring. However, because of the flexible nature of the springs and the vehicle’s weight is too heavy, the shocks can be too big. This is where the role of the shock absorber is so that shocks do not occur in the suspension system. The shock absorber will withstand the shock force through the liquid mechanism.

Stabilizer Bar

This one part is only found in the free or independent suspension system. Stabilizer is used so that the left and right wheels are not too far apart in margin. This is because the independent suspension system can produce a large rolling effect because there is one wheel that can not hold.

Stabilizer is useful so that the other wheel can withstand when one wheel experiences shocks. This component is composed of a swing bar and link stabilizer. The swing bar is the shaft that connects the left and right suspension systems. The stabilizer link is, on the other hand, connecting the end of the swing bar with the shock absorber.

Steering System

The steering system is also part of the chassis whose function is to relieve driving style and also control the direction of the front wheels. This system is made as an assistant so that when the driver turns the steering wheel it can be lighter.

There are two kinds of power steering, namely the hydraulic type and the electric type. The hydraulic type will use the hydraulic compressive force obtained from the steering pump so that it can push the steering rack. While the electric type will use a motor that will directly drive the steering rack.

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Braking System

The braking system is a system that serves to reduce the speed of the car significantly. The workings of this system is to use friction so that the rotational energy of the wheels can be turned into heat energy. In this system, there are two materials formed from iron and asbestos that will rub against each other.

This will help to reduce the rate of rotation of the car’s wheels. There are two brake systems commonly used in cars, namely drum brakes and disc brakes. Drum brakes are known to be quite good but less responsive brakes while disc brakes are more responsive.

Wheels and Tires

The last components you can find in a car chassis are wheels and tires. This component is usually located at the end of the powertrain whose function is to convert the rotational energy from the powertrain to be used as power from the vehicle.

Meanwhile, tires have a function to absorb small vibrations on the road and create friction with the road so that the wheels do not slip. Tires have several types such as hard, medium and smooth. Smooth materials usually have a soft structure so they have to be faster but have a pretty good grip.

That’s some information that we can present related to the car chassis. Car chassis is a component that is less well known among people who are not interested in car components. However, in fact most of the components you know are part of the chassis.

These components make the chassis a fairly important part and must be treated properly and repaired if it is porous. If you are looking for a car, of course you want to find a car with the best chassis.

How Does Chassis Structure Affect Handling?

Handling begins with a car’s chassis. Tires, brakes, and suspension can only do so much to tame a soft chassis. Chassis flex when a car is cornering or accelerating can cause instability and reduce tire grip as the alignment and toe change. This is all wrapped up in something called torsional rigidity, which refers to the chassis’ resistance to twisting.

What is Chassis

Rather than just being stiff, a rigid chassis that resists torsion provides a better ride and sharper handling, because it allows the suspension and tires to do their jobs. This is why convertibles aren’t typically the best handlers, since there’s no roof to tighten up the chassis and prevent twisting.

Those that have been prepped for better handling usually have added material and weight in the floor, or are made from exotic materials like carbon fiber to improve rigidity.

Do Electric Vehicles Have a Chassis?

Yes, but you may hear them being called different things.

Sometimes, EVs’ chassis are called “skateboards,” because they are literally a long, low structure with four wheels, upon which the rest of the vehicle is built. The skateboard houses the batteries and the motors are located in or near the wheels, so it does actually look like the thing Tony Hawk rode to fame and fortune.

This is big for automakers because the skateboard can be modified to work with a variety of vehicles and vehicle types, making it cheaper and more efficient to create a wide array of EVs.


Is the differential part of the chassis?

A differential is an element of the transmission system; thus, it doesn’t perform as the foundation or chassis of any car.

Is the chassis the same as the frame of the car?

A chassis is a minimum requirement or foundation for any vehicle to move. On the other hand a frame is the main structure of the chassis, and all the body components along with the chassis are fastened to it.

Can I replace the monocoque chassis of my car?

Most modern cars come with monocoque chassis. In case you find the monocoque chassis damaged, there are only two options before you.

You could either get it repaired, if possible, at an affordable cost or buy a new car since the replacement of a monocoque chassis is almost the replacement of the whole car.

Above is information about What is Chassis? that we have compiled. Hopefully, through the above content, you have a more detailed understanding of Functions and important of a chassis in a vehicle. Thank you for reading our post.

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