Car steering: device, types of systems and how it works in practice

How a driver turns the wheels: physics and mechanics in one unit

Imagine: you turn the steering wheel to the left, and the car obediently changes its trajectory. It seems simple - but behind this movement there is a complex system of gears, hydraulics and electronics. Steering is not only comfort, but also safety: its serviceability determines whether you can avoid an accident during a sudden maneuver. In this article, we will look at how this unit works, what types of steering mechanisms there are, and why modern cars are increasingly abandoning hydraulics in favor of electrics.

Interesting fact: in the first cars there was no steering wheel at all - instead there was a lever, like in carriages. Today, even budget cars are equipped electric amplifiers, and premium models receive systems with variable gear ratios. But the essence remains the same: to transfer force from the driver’s hands to the wheels with minimal losses and maximum precision.

Basic steering components: from steering wheel to wheels

The steering design includes several key elements, each of which performs its own function. Let's look at them in order - from the interior to the suspension:

• 🔄 Steering wheel — interface between the driver and the car. Modern steering wheels are equipped with airbags, multimedia control buttons and even heating.
• 🔗 Steering column - a shaft that transmits rotation from the steering wheel to the mechanism. It is often integrated energy-absorbing elements for safety in case of an accident.
• ⚙️ Steering gear - the heart of the system. There are three types: worm-type (obsolete) rack and pinion (most common) and ball screw nut (for heavy vehicles).
• 🛢️ Amplifier — hydraulic (power steering), electric (EUR) or electrohydraulic (EGUR). Makes it easier to turn the steering wheel, especially at low speeds.
• 🔗 Steering rods and ends - transmit force from the mechanism to the wheels. This is where backlash most often appears.

It is important to understand that 90% of modern passenger cars use a rack and pinion mechanism — it is more compact, more reliable and more accurate than a worm gear. But in trucks and SUVs you can still find a ball screw nut that can withstand heavy loads.

Types of steering mechanisms: which is better and why

The choice of mechanism depends on the type of car, its weight and purpose. Let's look at the three main types, their pros and cons:

Mechanism type	Application	Benefits	Disadvantages
Rack and pinion	Passenger cars, crossovers	Compact, accurate, low price	Sensitive to impacts (potholes, curbs)
Worm	Old models (pre-1990s)	Simplicity of design, maintainability	Large backlash, low accuracy
Ball screw nut	Trucks, SUVs	High reliability, withstands heavy loads	Complex design, expensive repairs

For example, Toyota Corolla or Volkswagen Golf equipped with a rack and pinion mechanism EUR, which ensures ease of management in the city. But UAZ Patriot or Ford F-150 They use a ball screw nut - here strength is more important than precision.

⚠️ Attention: If, after driving through a hole, the steering wheel begins to “walk” or there is a knocking sound when turning, the steering rack is most likely damaged. In rack and pinion mechanisms, even slight deformation of the housing leads to fluid leakage (in the case of power steering) or increased wear of the teeth.

How power steering works: power steering vs power steering

Power steering is not a luxury, but a necessity. Imagine having to park Mercedes S-Class without him! Let's look at the two most popular types:

• 💧 Hydraulic booster (power steering):
• It works by a pump that pumps liquid under pressure.
• Requires regular checking of fluid levels and replacement of hoses.
• Sensitive to temperature: in winter the liquid thickens, in summer it can overheat.
• ⚡ Electric amplifier (EUR):
• Uses an electric motor that turns on only when you turn the steering wheel.
• More economical (does not constantly take power away from the engine).
• Can be adjusted to different driving modes (for example, "Sport" or "Comfort" in BMW).

Go to EUR - this is the trend of the last decade. For example, Tesla Model 3 It has no hydraulics at all: all control is electronic, with feedback through the motor. But there is a nuance:

Why can the EUR "cut off"?

Unlike the power steering, which works even when the engine is turned off (while the pump is spinning), the power steering is completely dependent on electronics. If the battery is low or there is a system failure, the steering wheel becomes very heavy. However, modern cars have an emergency mode that allows you to hold out for service.

But EGUR (electro-hydraulic power steering) is a hybrid: the pump is driven by an electric motor rather than a belt from the engine. This solution is used, for example, in Volvo XC60 or Mazda CX-5.

Signs of steering problems: when to go to service

The steering does not tolerate negligence. If you ignore the first symptoms, you can wait until the system fails completely - and this is a direct threat to security. Pay attention to the following signals:

• 🔊 Knocking or squeaking when turning the steering wheel - a sign of wear on the steering rods, tips or rack bearings.
• 💦 Power steering fluid leak (red or brown) under the car - the hose or pump seal is damaged.
• 🌀 Stiff steering wheel rotation in one direction - there may be a leak in the hydraulic system or a problem with the pump.
• 🔄 Steering play (more than 10°) - critical wear of the rack teeth or loosening of the fastenings.
• ⚠️ Vibration on the steering wheel - often associated with wheel imbalance, but may also indicate problems with the steering system.

Particularly dangerous backlash. You can check it yourself:

1. Place the machine on a level surface.
2. Turn the steering wheel left and right with a small amplitude.
3. If the wheels begin to turn only after 1–2 cm of movement of the steering wheel, this is a reason for diagnosis.

⚠️ Attention: If, when driving at high speed, the steering wheel begins to “beat” or the car pulls to the side, immediately reduce your speed and stop. This could be a symptom of critically worn steering components or suspension problems.

Check the power steering fluid level (if any)

Check steering wheel play in place

Inspect the steering rod boots for integrity

Record in which direction the knocking occurs (left/right) -->

Steering service: what you can do yourself

Some steering system care operations are accessible even to beginners. Here's what you can do without visiting a service station:

• 🔧 Checking the power steering fluid level:
• Open the hood, find the reservoir with marks MIN/MAX.
• The liquid should be light (dark or with flakes - a sign of the need for replacement).
• Add only the composition recommended by the manufacturer (for example, Pentosin CHF 11S for VW/Audi).
• 🛠️ Inspection of anthers:
• Damaged rubber covers on tie rods lead to dirt getting in and rapid wear.
• If there are cracks on the boot, it needs to be replaced urgently (it is inexpensive, but repairing the rack will cost many times more).
• 🔄 Backlash adjustment (only for rack and pinion mechanisms with adjusting screw):
• On some models (for example, VAZ 2110) you can tighten the rack, reducing the backlash.
• But you can’t overtighten it - this will lead to a tight steering wheel and accelerated wear.

Here's what it's impossible do it yourself:

• 🚫 Disassemble the steering rack (requires special tools and adjustments).
• 🚫 Change power steering fluid without flushing the system (old fluid may contain metal shavings).
• 🚫 Ignore knocks, attributing them to “model features.”

The evolution of steering: what the future holds

Modern technologies transform familiar mechanics. Here are a few trends that are already being implemented or will appear in the coming years:

• 🤖 Steer-by-Wire — complete rejection of the mechanical connection between the steering wheel and wheels. Instead there are electronic signals. Such a system is already used in Infinity Q50 and Lexus LS.
• 🎮 Adaptive Steering — variable gear ratio depending on speed. In a parking lot, the steering wheel turns easily, but on the highway it becomes “sharp.”
• 🚗 Autonomous driving - in level machines Tesla Full Self-Driving the steering wheel can independently correct the trajectory, and in the future it will become completely unnecessary.

It’s interesting that even budget cars are getting smart features. For example, in Kia Ceed the latest generation, the steering wheel vibrates when leaving the lane, and in Ford Focus There is a system that automatically taxis in strong crosswinds.

However, progress also has a downside. Electronic systems require regular software updates, and their repair is more expensive than replacing a classic rack. For example, control unit Steer-by-Wire in Infinity can cost up to 100,000 rubles.

FAQ: Frequently asked questions about steering

Is it possible to drive if power steering fluid is leaking?

Short term - yes, but with caution. The steering wheel will become heavier, especially at low speeds. However, the leak cannot be ignored: if the fluid is completely lost, the power steering pump may fail, and its replacement will cost 15–30 thousand rubles. Check the hoses and seals, add fluid to the level and contact service.

Why does the steering wheel vibrate at speeds of 100–120 km/h?

There are several reasons:

• Wheel imbalance (the most common cause).
• Wear of wheel bearings.
• Deformation of the steering rack or rods after an impact.
• Wheel alignment problems.

Start by balancing the wheels. If the vibration remains, you need diagnostics of the suspension and steering.

Which is better: power steering or power steering?

Depends on priorities:

• power steering more reliable in extreme conditions (for example, off-road), but requires maintenance.
• EUR more economical, more accurate and allows you to adjust the force, but more expensive to repair.

Definitely for the city EUR, for SUV or commercial vehicles - power steering or EGUR.

How long does a steering rack last?

Service life depends on operating conditions:

• In European cars (for example, Volkswagen Passat) - 150–200 thousand km.
• In Korean (Hyundai Solaris) - 100–150 thousand km.
• In domestic (Lada Vesta) - 80–120 thousand km.

But these figures are only relevant when driving carefully. Regular trips to the pits reduce the resource by 1.5–2 times.

Is it possible to repair the steering rack or only replace it?

Repair is possible, but not always advisable. For example:

• If only the oil seals or bushings are worn out, they will be replaced, and the rack will last another 50–80 thousand km.
• If the body or teeth are damaged, just replace it. Repairs will cost 70–80% of the cost of a new rack, but it will last less.

The cost of a new rack for Toyota Corolla - about 25-40 thousand rubles, repairs - 8-15 thousand rubles.