What are the reasons for body vibration when the vehicle speed exceeds 120 km/h?
1 Answers
The reasons for body vibration when the vehicle speed exceeds 120 km/h are as follows: misalignment of the front wheel alignment angles, excessive toe-in; low front tire pressure or tire imbalance due to repairs or other reasons; deformation of the front wheel rims or uneven number of tire bolts. When the car wheels rotate at high speed, dynamic imbalance occurs, causing wheel vibration and steering wheel shaking during driving. Here are specific countermeasures: Lift the drive axle, place safety blocks in front of the wheels, start the engine, and gradually shift to higher gears to make the drive wheels reach the final test vibration speed. If both the body and steering wheel vibrate, it is caused by the drivetrain; if the final vibration speed is reached without vibration, the cause lies in the front axle. Check whether the front wheel alignment angles and toe-in meet the requirements, and adjust if misaligned. Lift the front axle and test the wheel rotation, checking the static balance of the wheels and whether the tires are excessively deformed. If necessary, replace with a good wheel for comparison. Check whether the front axle and frame are deformed, and whether the drive shaft is bent. If possible, perform dynamic balance testing on the drive shaft. Check the stiffness of the front leaf springs, the effectiveness of the shock absorbers, and whether the spring bracket rivets are loose. Replace if performance is inadequate. Check whether the chassis is loose and whether the ball joints are worn out.
