What are the causes of vehicle vibration at high speeds?
1 Answers
Car body vibration at high speeds can be caused by the following reasons: 1. Inaccurate front wheel alignment angle, excessive toe-in; 2. Low front tire pressure or imbalance caused by repairs or other reasons; 3. Deformation of front wheel rims or unequal number of tire bolts; 4. Loose installation of transmission system components; 5. Bent drive shaft, dynamic imbalance, or deformation of the front axle; 6. Failed shock absorbers, inconsistent stiffness of front leaf springs, or frame deformation. Below are the solutions for car body vibration at high speeds: 1. First, lift the drive axle, place safety blocks in front of the front wheels, start the engine, and gradually shift to higher gears to reach the final test vibration speed of the drive wheels. If both the car body and steering wheel vibrate at this point, the vibration is caused by the transmission system, as the front wheels and axle are stationary at this time. If the car does not vibrate at the final test vibration speed, the issue lies with the front axle. 2. Check if the front wheel alignment angles and toe-in meet the requirements and adjust them if necessary; 3. Lift the front axle and test the wheels, checking for static balance and excessive tire deformation. If needed, replace with a good wheel for comparison; 4. Inspect the front axle and frame for deformation, and check if the drive shaft is bent. Perform a dynamic balance test on the drive shaft if possible; 5. 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; 6. Inspect the chassis for looseness and check if the ball joints are worn out.
