Help, the chassis is abnormal, what is the matter with the chassis abnormal noise

The balance lever commonly used in car modification is commonly known as "top bar, tie rod". The English meaning of bar is the meaning of pull rod. According to its different purpose and functional requirements, it is divided into five categories: front wheel suspension tower top balance rod, front bottom beam balance rod and so on.

The abnormal sound of the chassis of the car may be the abnormal sound of the suspension of the car. The suspension system of the car generally includes the upper and lower swing arms, balance bars, ball head shock absorption, etc., and the abnormal sound caused by the suspension system is generally a dull or crisp impact sound. For example, after the balance rod is damaged or the bushing is worn, there will be a continuous abnormal sound of "Gregrad" when passing through bumpy roads, and there will be a dull sound of "knock knock" when the shock absorption is damaged through pits or bumpy road sections.

If the vehicle has this kind of abnormal noise, it is best to repair it as soon as possible, as damage to the suspension system will lead to deviation from the direction and tires.

It is also possible that constant velocity joints are commonly known as cages, which are divided into inner cages and outer cages. If the vehicle turns in the middle of the driving and there is an abnormal sound similar to "rattle rattle", it is usually caused by serious wear and tear of the constant velocity universal joint, and you only need to confirm which side the abnormal noise is, and then replace the constant velocity universal joint can be solved.

Abnormal noise of automobile bearings. No matter how big the tires of the car, the connection between the body and the tires is by a small wheel core bearing, the core bearing is damaged, the vehicle will make a continuous abnormal sound similar to "buzzing", the faster the speed, the stronger the sound, if the bearing is slightly damaged, there will generally be abnormal sound when the direction is lightly hit. Severe bearing damage will cause the tire to deviate, and serious tire eating will cause the tire to fall off.

The above is the more common abnormal noise of the automobile chassis, if the vehicle has the above abnormal noise, it must be repaired and replaced as soon as possible. After all, there are many reasons for the abnormal noise of a car, so you have to go to the repair shop for detailed maintenance.

If the chassis of the car is abnormal, it depends on the abnormal sound from the **, it is recommended that you can go to the repair shop to check it?

Some diagnostic principles of chassis abnormal noise: first, understand the generation of abnormal noise (sound) - the formation of abnormal noise is vibration or vibration, and then conduct sound through air or other media, that is, there is vibration or vibration to produce sound, if the abnormal noise can be reproduced when parking, you can directly touch the ** vibration with your hand, and you can probably know the source of the sound; If it is the abnormal sound of the upper and lower swings of the two wheels, brake pads, and brake cylinders, the sound will be heard much louder outside than when the windows are closed in the car;

Secondly, if it is the abnormal sound of the ball joint of the balance bar, it will be felt in the car that when the abnormal noise is generated, the main and passenger seats will feel the vibration and noise, but the sound heard on the side that produces the abnormal sound is greater; If it is the abnormal sound produced by the steering machine tie rod, grasp a front wheel, shake the other wheel left and right, the gap will be relatively large, and the side that produces the abnormal sound is obvious when the wheel passes through the uneven road, and the steering wheel may have a certain vibration when this abnormal sound is generated (and the abnormal sound of the swing bamboo generally does not vibrate or is lighter, because the sound of the swing arm is connected in multiple places and then transmitted to the steering wheel must be weakened); If it is an abnormal sound in the inner cage, there will be abnormal sound when walking on a straight road or when turning, and sometimes there will be a very crisp sound of "click"; If it is an abnormal sound of the outer cage, the sound is most obvious when the steering is basically killed. The abnormal noise is rarely produced and the position that is difficult for the general technician to determine is the abnormal sound produced by the lower shaft of the steering machine due to the looseness, which will cause the steering wheel to shake obviously, that is, when the abnormal noise is generated, the steering wheel obviously feels the vibration with the direction of the abnormal sound, but this sound sounds much smaller on the outside than on the inside, and the diagnosis method has two aspects: one is when the left and right window glasses are lowered, when crossing the uneven road section, the sound of abnormal noise from the outside is obviously not as loud as the sound coming from the car, The sound caused by the outer ball head or swing arm is eliminated, after all, the closing of the window glass plays a certain role in sound insulation; Second, when there is an abnormal noise, the steering wheel vibrates, and the abnormal sound is significantly reduced by pressing the lower axle of the steering machine with your foot.

Hope it helps.

Hello, check the lower swing arm ball joint, balance bar, balance bar rubber sleeve, upright rod, engine mount rubber sleeve, shock absorbing top rubber.

The automobile chassis is composed of four parts: the transmission system, the driving system, the steering system and the brake system. The role of the chassis is to support and install the automobile engine and its various components and assemblies, form the overall shape of the car, and accept the power of the engine, so that the car can move and ensure normal driving.

Car chassis.

Various possible causes of squeaky noises.

1. Abnormal sound of disc brakes.

Characteristic bai: vehicle du

When driving on a flat road at a low speed

In the axle part of the dao position emitted an intermittent and irregular "rattle" sound.

Reason: This is due to the damage, deformation and falling off of the brake shoe support plate, vibration damping spring plate or guide plate of the disc brake, which increases the gap between the brake shoe and the brake caliper support frame, and makes a sound when it hits each other. You can go to the repair station to repair the deformed parts and replace the parts that have fallen off.

Second, the front suspension ball head abnormal sound.

Features: When the vehicle is driving on the undulating road surface in a low-speed gear, the front axle part emits an uninterrupted "click" sound, the worse the road quality, the louder the sound, and the sound intensifies with the increase of speed.

Reason: The gap between the ball head and the ball head seat becomes larger, and the looseness is severe. Because the ball head seat is a sealed structure and cannot be removed, it can only be replaced at the repair station in this case.

Three. Abnormal noise of the front wheel shock absorber.

Features: On flat roads, you can hear the "cooing" of the front of the vehicle, which is intensified when turning sharp corners.

Cause: Vehicles are often driven on bad roads and are not properly maintained, resulting in oil leakage and damage to shock absorbers. Depending on the severity of the damage, it will need to be repaired or replaced.

Fourth, the transmission shaft universal joint abnormal sound.

Features: If the front drive constant velocity joint is faulty, in the vehicle in motion, especially when cornering or accelerating sharply.

Reason: The abnormal sound of the constant velocity gimbal is due to the excessive clearance of the gimbal or the issuance of cards. The main reason for the abnormal sound of the universal cross shaft is that there is no lubrication device or the maintenance is not timely. In this case, you should go to the workshop to apply grease or repair.

Loose chassis generally occurs in older cars, when the car is driving in bad road conditions, the steering wheel will feel unstable, the bottom of the car will also come out of the abnormal sound, usually the old driver can feel the overall a little loose, when encountering such a situation, it means that the chassis may be loose, and the reasons for this situation are divided into several, only by understanding the reasons, can we better prevent this problem from happening.

The first reason is the aging of rubber parts, we all know that the elasticity of rubber is particularly good, which can buffer the friction between parts and reduce noise at the same time. However, this kind of thing has a lifespan, and it will age after a long time, and the elasticity is not as good as before, so the buffering capacity will decrease, resulting in abnormal noise in each part, so it is necessary to check these rubber parts regularly and replace them in time.

The second possibility is the reason for the shock absorber, the main role of this part is to inhibit **, when the car is driving in the dustpan section, it will have an impact with the road surface, and the shock absorber can well ensure the smoothness of the car, if the shock absorber is damaged, there will be a scoop phenomenon, so that the chassis is loose, so usually check the shock absorber, if there is a leakage to repair in time.

The third is the clearance of the parts, that is to say, the ball head may be loose, this part is like the joint of the human body, if the ball head is loose, there will be a large gap between the lever and other connected parts, if the gap is too large, when crossing some dustpan roads, the screws between the subframe and the suspension will be loose, then the chassis will become loose, so usually check these two parts.

Thank you for adopting.

How does it sound? What kind of sound.

The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car. Slight noise, such as the flashing sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is smaller than that of Xunfanyan, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal driving of the car without repair.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that they lack their own understanding of mechanical knowledge, so they can distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the sound of the car sound of the silver identification method:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal sound and abnormal sound of sedan car.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

The reasons for the abnormal noise of the vehicle chassis are: the quality of the car itself, or the accident car, or the car environment that causes the chassis to be loose, check the rubber sleeve of the balance bar, whether the brake pads are easy to use, and the connection between the suspension and the shock absorber. 1.

There is a problem with the rubber sleeve of the balance bar. Phenomenon: When the vehicle passes through uneven roads, the chassis will make abnormal noises.

Equalizer bars are also called anti-roll bars and stabilizer bars. There are two clasps on the equalizer bar. Inside the buckle is a rubber sleeve for the balance bar.

Cold in winter and hot in summer, coupled with soil and dust erosion, will become harder and harder as it ages. As a result, when the vehicle passes over uneven roads, the height of the left and right wheels is inconsistent, resulting in a creaking noise. Workaround:

Just replace it. 2.There is a problem with the brake pads.

Phenomenon: There is an abnormal noise under the front wheels, especially when playing the steering wheel. When it rings, hit the brakes to see if it still rings.

If it doesn't ring, you can basically determine that there is a problem with the brake pads (there is also a possibility that there is a problem with the outer cage). Solution: Replace the brake pads.

3.There is a problem with the connection between the suspension and the shock absorber. If the chassis creaks when the car is moving, this is probably the reason.

Solution: After the vehicle is turned off, press the top of the suspension part of the body to make the body shake up and down. At the same time, you can listen carefully to the abnormal noise to determine which part is the problem.

1. Constant velocity universal joint abnormal sound: Constant velocity universal joint is commonly known as ball cage, and its main function is to transmit power and complete steering. If the constant velocity universal joint is seriously worn, and the vehicle turns while driving, there is an abnormal sound similar to "rattle and rattle", you only need to confirm which side the abnormal noise is, and then replace the constant velocity universal joint to solve it.

2. Abnormal sound of wheel bearing: The function of wheel bearing is to connect the vehicle and the tire. No matter how big the tire is, the connection between the vehicle and the tire is by a small wheel bearing, if the wheel bearing is damaged, it will cause the tire to deviate, or even the tire to fall off.

When the vehicle is driving, it emits a continuous abnormal sound similar to "buzzing", which is the alarm of the wheel bearing, and the faster the speed, the stronger the sound, if it is slightly damaged, there will be an abnormal sound when the direction is generally tapped.

3. Abnormal sound of exhaust pipe: abnormal sound of exhaust pipe is generally caused by rupture or leakage of exhaust pipe, and there will be "poof" noise after the vehicle starts. It may also be caused by the damage or blockage of the three-way catalytic converter, which is used to reduce the noise while purifying the exhaust gas.

The above is the introduction of the abnormal sound of the car chassis, I hope it will help you.