Car design: names and purposes of main parts

Have you ever wondered how your car works? Behind the complex body shell hides hundreds of interconnected parts, each of which performs a strictly defined function. Understanding the main components and assemblies not only expands your technical horizons, but also helps diagnose faults in a timely manner, communicate competently with the mechanics at the service station and even save on repairs. For example, knowing that a knock in the front suspension is most likely due to stabilizer struts or ball joints, you will not pay to diagnose something that you can identify yourself.

In this article we will look at 12 key car systems without which its operation is impossible, - from the power unit to electronics. We will pay special attention to those components that most often fail and require intervention. You'll learn not only "what it is" but also "why it breaks" and how to extend the life of critical parts. The material will be useful for both beginners and experienced drivers who want to systematize their knowledge.

1. Internal combustion engine (ICE): the “heart” of the car

The engine is main source of energy for the movement of the car. Most modern cars are equipped with four-stroke piston internal combustion engines running on gasoline or diesel fuel. The principle of operation is based on the combustion of the fuel-air mixture in the cylinders, which sets the pistons in motion, and they, in turn, rotate the crankshaft. Power and torque are transmitted further to the transmission.

Among the key elements of the internal combustion engine:

• 🔥 Cylinder block - the basis of the engine in which the cylinders, pistons and connecting rods are located. Made from cast iron or aluminum alloys.
• ⚙️ Crankshaft — converts the reciprocating motion of the pistons into rotational motion.
• 💨 Cylinder head (cylinder head) - contains valves, camshaft and ignition system (in gasoline engines).
• 🛢️ Lubrication system — provides oil supply to rubbing parts to reduce wear.

The most common engine malfunctions are related to overheating (often due to a faulty thermostat or pump), piston ring wear (leads to oil consumption) and contamination of injectors (especially relevant for diesel engines). Regularly changing oil and filters, as well as using high-quality fuel, extends the life of the engine by 30-40%.

⚠️ Attention: If the indicator on the dashboard comes on Check Engine, you cannot ignore it - it can signal serious problems, from misfires to catalyst malfunction. It is better to carry out diagnostics within 1-2 days.

2. Transmission: transferring power to the wheels

A transmission is a set of mechanisms that transmit torque from the engine to the drive wheels. It allows you to change the speed and direction of movement, as well as disconnect the engine from the wheels (for example, when braking or in neutral gear). Depending on the type of drive (front, rear, all-wheel drive), the design of the transmission can vary greatly.

Main components:

• 🔄 Clutch — temporarily disconnects the engine and gearbox for smooth gear shifting (in manual and robotic gearboxes).
• ⚙️ Gearbox (Gearbox) — changes the gear ratio, allowing the engine to operate in optimal mode. It can be mechanical, automatic, robotic or CVT.
• 🚗 Drive shafts — transmit torque from the gearbox to the wheels (in front-wheel drive cars) or from the transfer case to the axles (in all-wheel drive cars).
• 🔗 Differential — distributes power between the wheels of the same axle, allowing them to rotate at different speeds (for example, in corners).

The most vulnerable elements of the transmission are clutch (wears out during aggressive driving), seals and anthers (leak when rubber ages) and gearbox bearings (failure due to lack of oil). For example, a characteristic crunch when turning the steering wheel while the car is stationary often indicates a malfunction CV joint (constant velocity joint).

Gearbox type	Benefits	Disadvantages	Service life (thousand km)
Mechanical	Reliability, low repair costs, cost-effectiveness	Fatigue during traffic jams, requires driving skills	300-500
Automatic (torque converter)	Comfort, smooth shifting	Expensive repairs, increased fuel consumption	250-400
CVT (CVT)	Smooth acceleration, fuel efficiency	Sensitivity to overheating, expensive maintenance	200-300
Robotic (DCT)	Fast switching, economical	Jerks when driving, expensive clutch repairs	200-350

3. Chassis: comfort and controllability

The chassis (or suspension) is the system that connects the car body to the wheels, providing a smooth ride, stability and control. It absorbs impacts from road unevenness, maintains the optimal position of the wheels relative to the body and allows the driver to control the trajectory of movement. Directly depends on the condition of the chassis security: worn shock absorbers increase braking distance by 20-30%!

Key elements:

• 🏗️ Shock absorbers — dampen body vibrations, preventing it from swaying. They are oil, gas or gas-oil.
• 🌀 Springs - support the weight of the car and return the suspension to its original position after hitting an obstacle.
• 🔗 Levers and ball joints — provide a movable connection between the wheels and the body, allowing them to turn.
• 🚗 Anti-roll bar - Reduces body roll in corners.
• ⚙️ Wheel bearings — ensure smooth rotation of the wheels.

Signs of a chassis malfunction:

• 🔊 Knocks or squeaks when driving over uneven surfaces (most often caused by stabilizer links or ball).
• 💦 Oil leaks on shock absorbers (signal of loss of tightness).
• 🚘 The car “pulls” to the side when driving in a straight line (problems with wheel alignment or wear steering rods).
• 🌀 Excessive body sway after passing a speed bump.

⚠️ Attention: If after replacing shock absorbers or springs you have not done wheel alignment, the tires will wear unevenly and handling will deteriorate. This procedure is mandatory after any intervention in the chassis!

Check the shock absorbers for oil leaks|

Inspect the boots of CV joints and ball joints for integrity |

Make sure there is no play in the tie rods|

Check tire pressure and even tread wear-->

4. Brake system: your safety is in your hands

The braking system is a set of mechanisms that reduce the speed or completely stop the car. It works by converting kinetic energy of movement into thermal energy (when brake pads rub against discs or drums). In modern cars it is used hydraulic drive, where the force from the brake pedal is transmitted through the brake fluid.

Main components:

• 🛑 Brake discs/drums — rotating elements to which the pads are pressed.
• 🧱 Brake pads - friction linings that create friction. They consist of a metal base and asbestos or ceramic material.
• 💧 Brake calipers - clamp the pads around the disc (in disc brakes).
• 🔄 Master brake cylinder — converts the mechanical force of the pedal into hydraulic pressure.
• 🚨 ABS (anti-lock braking system) — prevents wheel locking during emergency braking.

Critical malfunctions of the brake system:

• 🔴 Brake fluid leak - leads to pedal failure and complete loss of brakes.
• 🔊 Creaking or squealing when braking - indicates wear of the pads or dirt on the working surfaces.
• 🌀 Steering wheel or pedal vibration - often caused by deformation of brake discs.
• 🚗 Pulling the car to the side - may indicate a jammed caliper or uneven pad wear.

The service life of brake pads depends on driving style and quality of materials. On average:

• 🚗 Front pads: 30,000–50,000 km
• 🚘 Rear pads: 60,000–100,000 km
• 🌀 Brake discs: 100,000–150,000 km

5. Steering: precise and responsive

The steering is responsible for changing the direction of movement of the car. In modern cars it is used rack and pinion mechanism, which converts steering wheel rotation into wheel rotation. To facilitate control it is used power steering - hydraulic (power steering), electric (electric power steering) or combined.

Main elements:

• 🎛️ Steering wheel — interface between the driver and the system.
• ⚙️ Steering column - a shaft that transmits rotation from the steering wheel to the rack.
• 🔧 Steering rack — converts rotational motion into translational motion, turning the wheels through rods.
• 💧 Power steering/electric power steering pump — creates pressure to make steering easier to turn.
• 🔗 Steering rods and ends - connect the rack to the steering knuckles of the wheels.

Signs of trouble:

• 🌀 Tight steering wheel - may indicate a faulty power steering pump or low fluid level.
• 🔊 Knock when turning - often caused by wear of steering tips or rack bushings.
• 💦 Power steering fluid leaks - signal about damage to hoses or seals.
• 🚗 Steering play - a dangerous symptom requiring immediate diagnosis (may be associated with wear cervical slats or column bearings).

⚠️ Attention: If the steering wheel vibrates when driving at high speed, immediately reduce the speed and check the wheel balancing. Imbalance can lead to loss of control of the vehicle!

What to do if the power steering fails?

If the power steering or power steering suddenly stops working, do not panic:

1. Hold the steering wheel firmly with both hands - the turning force will increase by 3-5 times.

2. Reduce speed and turn on your hazard lights.

3. Pull over smoothly to the side of the road, avoiding sudden maneuvers.

4. Check the power steering fluid level (if there is a leak) or the power steering fuse.

5. Call a tow truck - further driving without a booster is dangerous!

6. Electrical equipment and electronics: the “nervous system” of a car

It is impossible to imagine a modern car without electronics. From the simplest light bulbs to complex engine control systems, everything runs on electricity. The main source of energy is rechargeable battery, and with the engine running - generator, which recharges the battery and powers the on-board network.

Key components:

• 🔋 Battery — provides engine starting and power supply to systems when the engine is turned off. Average service life: 3–5 years.
• 🔄 Generator - converts the mechanical energy of the engine into electrical energy. Outputs voltage 13.8–14.4 V.
• 💡 Starter - an electric motor that rotates the crankshaft to start the internal combustion engine.
• 📡 ECU (electronic control unit) - the “brain” of the car, controlling the operation of the engine, transmission and other systems.
• 🚨 Dachtikov and sensors — collect data on the operation of nodes (for example, oxygen sensor, crankshaft position sensor).

Typical electrical problems:

• 🔋 Battery discharge - often caused by current leaks (for example, due to a faulty alarm) or sulfation of the plates.
• 💡 Blown fuses - indicates a short circuit in the circuit.
• 🔌 Oxidation of contacts - leads to poor engine starting or flickering lights.
• 🚨 ECU errors - may be caused by a malfunction of sensors or wiring (diagnosed by a scanner OBD-II).

For prevention it is recommended:

• 🔧 Once a year, clean the battery terminals from oxides (use soda solution).
• 💡 Check the voltage of the on-board network with a multimeter (should be 12.6 V with the car turned off and 13.8–14.4 V running).
• 📡 Regularly update the ECU firmware (relevant for cars older than 2015).

7. Body and interior: protection and comfort

The body is the supporting structure of the car, which protects passengers and internal components from external influences. Modern bodies are made of high-strength steel or aluminum alloys (for example, in Audi A8 or Jaguar XE), which reduces weight and increases safety. Comfort systems are concentrated in the cabin: seats, instrument panel, climate control and multimedia.

Main elements:

• 🚗 Load-bearing body - the base to which all units are attached. It can be framed (SUVs, pickups) or frameless (passenger cars).
• 🛡️ Deformation zones — designed to absorb impact energy in an accident.
• 🪟 Glass — frontal (triplex), side and rear (hardened). The windshield can withstand stone impacts at speeds up to 120 km/h.
• 🪑 Seats — equipped with seat belts, heating and electric adjustments.
• 🌡️ Climate control system — maintains the set temperature in the cabin.

Exterior and interior care:

• 🚿 Washing - use non-contact methods or the two-bucket method to avoid scratches.
• 🎨 Polishing — restores shine and protects paintwork from UV rays (recommended 1-2 times a year).
• 🧹 Interior cleaning - use special conditioners for leather, and foam cleaners for fabrics.
• 🔧 Anti-corrosion treatment — mandatory for cars older than 5 years (especially in regions with salt on the roads).

⚠️ Attention: If there is a damp smell in the cabin after rain, check the drain holes under the windshield - they could be clogged with leaves or dirt. This leads to water stagnation and body corrosion!

FAQ: Frequently asked questions about car parts

❓ Why do shock absorbers knock on uneven surfaces?

Knocking noise in shock absorbers is usually caused by:

• 🔧 Bushing wear - rubber or polyurethane parts that dampen vibrations.
• 💧 Oil leak - if the shock absorber “leaks”, it loses its damping properties.
• 🚗 Rod damage - for example, after hitting a deep hole.

To diagnose, press on the car's fender and release sharply: if the body oscillates more than 1-2 times, the shock absorber is faulty.

❓ How often do you need to change brake fluid?

Brake fluid is hygroscopic - it absorbs moisture from the air, which lowers its boiling point. Recommended replacement intervals:

• 📅 Every 2 years - regardless of mileage (even if the car is in the garage).
• 🚗 Every 40,000–60,000 km - for cars with intensive use.

Ignoring replacement may lead to brake failure during a long descent or emergency braking!

❓ What is CV joint and why does it crunch?

CV joint (constant velocity joint) - this is a part of the drive shaft that transmits torque to the wheels at an angle. A crunching sound when turning the steering wheel while the car is stationary or when starting off indicates:

• 🔧 Worn balls or races - The CV joint needs to be replaced.
• 💧 Damage to the boot — if dirt or water gets inside, the part quickly fails.

Average CV joint resource: 100,000–150,000 km, but if the boot is damaged, it can break within 5,000 km.

❓ Is it possible to drive with a faulty oxygen sensor?

An oxygen sensor (lambda probe) monitors the composition of exhaust gases, helping the ECU optimize mixture formation. If it is faulty:

• ⚠️ The panel will light up Check Engine.
• 💨 Fuel consumption will increase by 10–20%.
• 🚗 The engine will run unstably (especially at idle).
• 🌍 Exhaust toxicity will increase (may not pass inspection).

You can drive, but it is not advisable - long-term operation with a faulty sensor leads to excessive fuel consumption and catalyst wear.

❓ How to check the wear of brake discs?

The minimum permissible thickness of the brake disc is indicated on its edge (e.g. MIN TH=22 mm). You can check wear:

• 📏 Vernier caliper - measure the thickness at several points.
• 👀 Visually - if a step (shoulder) with a height of more than 1–2 mm, the disk needs to be replaced.
• 🔊 By ear — when braking, a metallic grinding sound is heard (the pads rub against the shoulder).

Also note steering wheel beating when braking - this is a sign of disc deformation.