The faster the speed of 120, the more shaky it is. Why?
The faster the speed of 120, the more shaky it is. Why? Nowadays, cars are very popular. Many people bought cars as a means of transportation. No matter what kind of car, there will be some problems more or less. So why does the speed of 120 shake faster and faster?
The faster the vehicle speed is at 120, the more unstable it is. 1 120 The reasons for the downward swing of the vehicle speed are as follows: 1. Force feedback caused by tire touching the ground; 2. A series of problems of the automobile itself, such as the inward or outward inclination of the automobile wheels, foreign objects on the tire surface, wheel balance weight falling off, wheel hub deformation, excessive steering rod clearance, insufficient tire pressure, etc.
1. Because the car touches the ground through four wheels, the ground is not absolutely flat. The whole vibration of the car is caused by the feedback of the force formed after the tire touches the ground. Under the condition of the same road surface, the contact range with the road surface at low speed is smaller than that at high speed, and the force feedback on the steering wheel is also smaller.
When the car is driving at high speed, the tire contacts the ground more widely and the force feedback is greater, which is more obvious than at low speed. This is the reason why most cars shake the steering wheel at high speed, which is normal.
The four wheels of a car should be perpendicular to the ground. If it inclines inward or expands outward, there will be a series of problems of the car itself, such as foreign bodies on the tire surface, wheel balance weight falling off, wheel hub deformation, too large steering rod gap, insufficient tire pressure and so on. The car will shake when driving. In this case, driving is more dangerous.
Because the vehicle needs to transmit power to the ground through the tire, the tire will keep rotating as long as it is moving. The faster the vehicle speed, the more times the tire rotates.
Then at this time, if the tire is unbalanced when rotating, various problems will arise. For example, the greater the mass deviation on the whole circumference of the tire, the greater the deviation will be in the case of high-speed rotation, which will directly affect jitter and vibration, increase fuel consumption, affect comfort and bring security risks.
Generally speaking, to solve this problem, it is necessary to install a balance weight on the wheel hub, find the exact position and weight to be installed through the dynamic balancing machine, and add it.
Correctly adjusting tire dynamic balance will bring many benefits, such as increasing driving comfort, ensuring vehicle stability and reducing unnecessary fuel consumption. In addition, under the condition of normal dynamic balance, the tire life can be longer, and the stable rotation can reduce the loss of the suspension part of the vehicle chassis, which is self-evident for safety.
The problems of automobile tires are specifically divided into the following points:
(1) Four tires have uneven pressure (especially the first two wheels).
(2) Uneven tread wear (unilateral tire biting).
(3) The rims of the four wheels are not really round (iron rings or aluminum rings are changed to ellipses).
(4) After replacing the tires of four wheels, no positioning correction was made.
(5) The tire pierces a foreign body and forms a bulge on the tread, which cannot be felt when driving at low speed (absorbed by the shock absorption system). Once driving at high speed, the frequency vibration will be obvious.
The faster the vehicle speed is 120, the more it shakes. Why 2 When the vehicle speed reaches 120 km/h, the car body will tremble, usually the tires are badly worn, which leads to the car body shaking at high speed. Just change the tire and complete the four-wheel alignment.
However, the following situations will occur:
1, it may be that the foot pads of the car are aging and elastic, and the shock absorption performance is poor. When the car reaches 120 km, it will produce * * * vibration.
2. It may be that the shock absorber of the car has poor performance and the car will shake when driving at high speed.
3. It may also be the jitter caused by the deviation of the internal inclination angle of the automobile four-wheel alignment.
4. The ball head in the ball cage is seriously worn, and there will be high-speed jitter.
5. If the air pressure difference between the four tires is too large, there will be jitter at high speed.
We must carefully check the vehicle when driving every day, and go to the 4S shop for treatment in time when we find hidden dangers. To ensure the safety of driving on our roads. The key point is to ask professional automobile maintenance personnel to systematically inspect the vulnerable parts of the automobile regularly, and replace them in time when defects are found. To replace parts, please select original accessories.
The causes of car jitter:
1, too much carbon deposit. If the carbon deposit in the engine cylinder is serious, it will cause the spark plug to be blocked and the valve to be blocked, which will directly lead to the idling jitter of the car. If the acceleration ability of the car is not as good as before and the jitter is lasting, then you can consider cleaning the engine cylinder.
2. Oil supply system failure. Unstable oil pressure will easily lead to unstable mixture concentration, which will not only cause jitter, but also cause unstable idle speed. You can consider replacing the gasoline filter first. After all, the filter element may be blocked after being used for a long time, and then check the oil pressure that does not pass through the gasoline filter. If it is not normal, there may be something wrong with the oil pump.
Vehicle maintenance:
When the cold car starts, pay attention to let the car run for one and a half minutes to give the car a warm-up time. At first, the internal temperature of the engine could not reach the normal working temperature-it was normal for the water thermometer to show 90 degrees. The car will shake, the engine will ring, and the tachometer will be slightly higher-normal means 600 rpm to 900 rpm.
If the engine is started under such circumstances, it is easy to cause carbon deposition in the engine.
The faster the vehicle speed is 120, the more it shakes. Why 3 1? Vehicle jitter is mostly a tire problem. At this time, waiting for the bus mainly checks the tire pressure in time. When the tire pressures of the four tires are inconsistent, the surface damage of the tires is different. At this point, the body will shake when driving at high speed. If it is caused by the tire pressure problem, you can adjust the tire pressure or replace it with a new tire.
It is not the tire pressure, so it is necessary to check the engine. For example, if there is carbon deposit inside the engine, or the throttle has serious carbon deposit, the mixture concentration will be abnormal. At this time, the body will shake. Car owners are advised to develop the good habit of cleaning the engine regularly.
3. It is also possible that there is something wrong with the dynamic balance. At this time, the owner needs to go to the repair shop to make a dynamic balance first. If the vehicle is shaking at the same time and the steering wheel is still biased, a four-wheel alignment is needed to complete the dynamic balance.
What's with the car body shaking when the speed exceeds 120 yards?
1. First, set up the drive axle, insert the safety plug on the front wheel, start the engine, and gradually shift to a higher gear, so that the driving wheel can reach the final test shimmy speed. If the body and steering wheel are shaking at this time, it is the vibration caused by the transmission system, because the front axle of the front wheel is at rest at this time; If the final test shimmy speed is reached, the vehicle does not shake, and the shimmy is caused by the failure of the front axle of the vehicle;
2. Check whether the positioning angle and toe-in of the front wheel meet the requirements, and adjust it if it is not aligned;
3. Set up the front axle to try to turn the wheel, and check the static balance of the wheel and whether the tire is deformed too much. If necessary, replace the good wheels for comparison test;
4. Check whether the front axle and frame are deformed, check whether the transmission shaft is bent, and do dynamic balance of the transmission shaft if possible;
5. Check the stiffness of the front leaf spring, the efficiency of the shock absorber and the looseness of the rivet of the spring bracket. If the performance is not in conformity, it shall be replaced;
6. Check whether the chassis is loose and whether the ball head is aging.