The situation when steering It is transmitted in the palm of the driver, can cause panic even in an experienced motorist. This is not just discomfort that prevents you from enjoying the trip, but also a direct signal that serious violations have occurred in the control system or chassis. Ignoring such symptoms can lead to loss of controllability at high speed or emergency braking.
The causes of the beat can be completely different: from the banal unbalance of the wheels to the complex geometric distortion of the brake discs. The driver must learn to distinguish between vibration patterns to pinpoint the source of the problem. Gravity. Inertia and inertia are the main forces that amplify even minimal deviations in the circular motion of the wheels.
In this article, we will discuss in detail all possible scenarios why steer under different driving conditions. We will consider the methods of diagnosis that can be carried out independently, and point out cases when you can not do without contacting the service center. Understanding the physics of the process will help you save time and money on unnecessary repairs.
Vibration at high speed: wheel imbalance
The most common reason why the steering wheel starts to shake in the speed range from 80 to 120 km / h is a violation of wheel balance. During long-term operation, loaders glued or stuffed onto a disk can peel off or fly off. Even a slight shift in the center of mass of the wheel causes a beat, which steering-rod It's on the steering wheel.
Often the problem is exacerbated by the sticking of dirt on the inside of the disk or the formation of ice growths in winter. In such cases, the weight of the "garbage" can reach several tens of grams, which is critical for the regime. If you have recently changed tires or repaired suspension, the probability of imbalance increases many times.
To eliminate the fault, you need to apply to tire fitting. The wizard will remove the wheel, clean the disk and re-distribute the loaders on the balancing machine. It is critical to balance all four wheels, even if vibration is only felt on the front steering wheel.The rear wheels also affect the overall stability of the car.
- 🚗 Loss of cargo: The main factor that requires a rebalancing procedure.
- 🧊 Mud sticking: It is important after traveling on the road or in the slush.
- 🔧 Disk deformation:The "eight" of the cast or stamped disc also causes a beat.
- 📉 Wear of rubber: Uneven tread wear can mimic an imbalance.
Beating the steering wheel during braking: problems of the braking system
If the steering wheel begins to vibrate only at the moment of pressing the brake pedal, the problem is almost guaranteed to lie in the brake discs. With intensive braking, especially with subsequent hitting a puddle, the red-hot metal of the disc is subjected to a sharp uneven cooling. This leads to the appearance of local zones with different thicknesses, the so-called heat-deformation.
When you press the brake, the pads clamps the disc. If its surface is not perfectly flat, the pads begin to "jump" on the bumps, transmitting these microscopic but high-frequency blows to the caliper, then to the swivel fist and, eventually, to the steering wheel. In the initial stages, this feels like a slight pulsation, but over time it develops into a strong shaking of the entire body.
Can I get the disks to run?
The flow is only possible if the residual thickness of the disc allows this to be done according to the manufacturer's specification. If the disc is already thin, its replacement is mandatory, as thin walls can burst under the pressure of the pads.
Diagnose the curvature of the discs can be visually (sometimes the beat is visible to the eye when the wheel is rotating) or using a micrometer, measuring the thickness of the disk at different points. Also, the cause may be a jammed caliper, which does not fully release the shoe, causing constant overheating and subsequent curvature.
- 🔥 Overheating: Abrupt cooling of a hot disk with water is the main cause of deformation.
- 🛑 Jamming: The failure of the calipers leads to uneven wear.
- ⏳ Time: Natural wear and fatigue of the metal over time change the geometry.
Vibration at low speed and during acceleration
A situation where the steering wheel shakes during acceleration or at low speeds (40-60 km / h), often indicates transmission problems or serious wheel deformation. Unlike high-speed imbalances, there are less inertial forces, so the beats cause more gross defects. Often the culprit is the culprit. pomegranate (Share of equal angular velocities - SRUS) or driveshaft.
If during acceleration you hear a characteristic crunch, which is accompanied by vibration, most likely, the angle of the SRUS operation is violated or its resource is developed. In front-wheel drive cars, it is through internal and external grenades that torque is transmitted, and any backlash in these units is felt as jerks of the steering wheel.
It is also worth checking the status of the Silentblocks of levers. If the rubber metal hinge is destroyed, the suspension lever gets freedom of movement, and the wheel begins to "walk" when the load changes, which causes chaotic beating of the steering wheel.
Silentblock check: Ask the assistant to sway the car up and down while you watch the suspension levers. If the rubber bushes are visible backlash or stratification of rubber - the part needs to be replaced.
In the case of the driveshaft (on rear-wheel drive cars), vibration can occur due to the imbalance of the shaft itself or the wear of crosses. This is a dangerous malfunction that can lead to the cardan's tearing off on the move.
Influence of tires and wheel disc geometry
The condition of the tires is the foundation of safety, and any defects in the rubber directly affect the comfort of the control. Hernia on the sidewall of the tire is a consequence of the rupture of the internal threads of the cord. Such a tire loses its tightness and strength, creating a beat that feels like blows to the steering wheel. Operating a car with a hernia is strictly prohibited.
In addition to mechanical damage, there is the concept of "static memory" rubber. If the car stood still for a long time (for example, in winter), flat areas could form on the tire. At first, they will cause vibration, but usually disappear after 10-20 kilometers of active driving, when the rubber warms up and straightens.
Special attention should be paid to the geometry of the disk. Cast discs when hitting deep pits can crack or get a hidden deformation that is difficult to notice visually. Stamped disks crumple easier, but they are easier to control. The inconsistency of the bus landing on the disk also causes the effect of "eight".
| Type of defect | Symptoms. | Decision | Danger. |
|---|---|---|---|
| Herniation on a tyre | Strong beat at any speed | Replacement of the tyre | High (gap) |
| Disc deformation | Pulsation, sideways. | Edit or replace | Medium |
| Uneven wear | Noise, light vibration. | Replacement, fall-up | Low. |
| Tread detachment | Knock, shaking hard. | Urgent replacement | Critical |
Faulty steering and suspension
If the wheels and brakes are in order, the search for the cause shifts towards the steering mechanism. Wear of steering tips and rods is one of the frequent causes of backlashes. When a gap appears in the joint of the hinges, the wheel gets the opportunity to randomly change the angle of rotation under the influence of road irregularities, which is transmitted to the steering wheel.
The steering rack can also be a source of problems. Wear of a jagged pair or reiki dryer leads to the fact that the gear does not fit tightly to the shaft. This causes a feeling of "empty" steering wheel and vibration, especially on smooth asphalt. In some cases, you need to adjust the gap, but more often - the replacement of the remplekt or the entire node.
☑️ Suspension diagnostics
Do not forget about shock absorbers. If the shock absorber is "broken" and does not hold the impact, the wheel after hitting the bump begins to make unfading fluctuations. These fluctuations are transmitted to the body and steering wheel. You can check the shock absorber by sharply pressing on the corner of the body: if the car swung more than 1-2 times, the shock absorber is faulty.
The engine and its effect on steering vibration
Sometimes the cause of shaking lies not in the chassis, but in the work of the power unit. If the steering wheel vibrates at idle speeds or when stopping at traffic lights, it is possible that the engine is not running smoothly. Troynia (when one of the cylinders does not work) causes strong vibrations of the engine, which are transmitted through the pillows to the body and steering column.
The engine supports (pillows) are used to extinguish vibrations. They are made of rubber and metal. Over time, the rubber dries and cracks, ceasing to perform its function. As a result, the engine begins to contact the subframe rigidly, and all vibration goes to the cabin.
Also, the cause may be the ignition system: old candles, breaking through high-voltage wires or faulty coils. This leads to ignition misses, the engine begins to "sausage", and the steering wheel shakes in the stroke of the engine.
⚠️ Warning: If the vibration is accompanied by a lamp burning
Check EngineError codes must be considered. Ignoring ignition passes can quickly disable the catalytic converter.
Diagnostics and methods of solving problems
The search for faults should begin with the simplest and cheapest. The first step should always be to check the tire pressure and visually inspect the wheels. Then, a trip to the tires to check the balance and geometry of the discs. This eliminates 60% of all possible causes.
If the wheels are normal, the car should be lifted on the lift. The mechanic rocks the wheels, check the backlashes in the steering tips, the condition of the Silentblocks and anthers of the SRUS. Inspection of the brake system will reveal the beating of discs or jamming of calipers.
Consistent diagnosis from wheels to engine avoids replacement of serviceable parts and accurately locates the source of vibration.
In difficult cases, when there are no obvious backlashes, it may be necessary to check the angles of the wheel installation (drift-fall) on the 3D stand. Wrong angles can cause sliding and non-ranomer wear, which in the long run will lead to vibration.
Prevention and care of the chassis
To avoid the appearance of vibrations in the future, you should follow a few simple rules. First of all, it is a careful ride. Avoiding deep pits, speeding cops and curbs will preserve the geometry of the discs and the integrity of the suspension.
Regular washing of wheel arches and discs themselves helps to notice the corrosion that has begun or the balance weight that has unstuck in time. It is also recommended to periodically check the pressure in the tires, as under-performed rubber wears out unevenly and loses shape faster.
⚠️ Warning: After any suspension repair, tire or disc replacement, be sure to make a descent-shatter. This will prolong the life of the rubber and ensure stability of management.
Timely replacement of consumables such as Silentblocks and steering tips will prevent the appearance of large backlashes that destroy other car components. Do not wait until the knock becomes loud - the diagnosis should be carried out with each planned TO.
Why does the steering wheel only shake in winter?
In winter, a frequent cause is freezing snow and ice on the inside of the wheels. Even a small lump of snow stuck unevenly creates a strong imbalance. Also in the cold, rubber suspension elements (silent blocks, stabilizer bushings) smack, which is why they begin to miss more vibrations from the road. After heating up the car or cleaning the discs, the problem usually disappears.
Is it dangerous to drive if the steering wheel is hitting?
Driving with a strong vibration is dangerous. This not only reduces comfort, but also worsens the contact of the tire spot with the road, increasing the braking distance. In addition, constant shaking accelerates the wear of all conjugated parts: steering racks, hub bearings, suspension elements. In an emergency situation, when a sharp maneuver is required, a car with a faulty suspension can behave unpredictable.
Can it be shaking because of poor quality gasoline?
Yes, indirectly. If the gasoline is poor quality, the engine begins to work intermittently (detonate or triple). Vibration from the unevenly working motor is transmitted to the body and steering wheel, especially at idle speeds. However, in motion, such a shaking is usually in the nature of twitching, and not constant beating, as with problems with wheels.