The steering wheel not only controls the direction of the vehicle, it also identifies faults. The safe step is to learn how to use the steering wheel and how to use the steering wheel correctly. The following small series introduces you to several steering wheel tips and protections~ First, the vehicle is numb during driving. When the vehicle is driving at a medium speed or higher, the chassis has a periodic sound. When the vehicle is severe, the cab and the door are trembling. The steering wheel vibrates strongly until the hand is numb. This is because the directional gear is broken, the drive shaft and its spline are broken. The shaft and spline sleeve are caused by excessive wear. Second, heavy and laborious when turning. The causes are that the rolling bearing and the sliding bearing of each part of the steering system are too tightly fitted, the bearing is poorly lubricated, the ball of the steering rod and the tie rod is too tight or lack of oil, and the steering shaft and the casing are bent, causing the front wheel to be stuck. The beam adjustment is not the current car or the frame is bent, and the deformed tire is insufficient in air pressure, especially the front tire. Many car drivers like to hold the steering wheel with bare hands. The picture is convenient and easy to save, but I don’t know if it will hurt the health. As we all know, when the motor vehicle is started or on the road, there are different degrees of vibration, and this kind of vibration is harmful to the human body. Scientific research shows that people who drive motor vehicles for a long time, due to the influence of vibration, cause the nervous system to decline, such as inhibition of conditioned reflexes, damage to nerve endings, loss of vibration and pain, and reduced ability to adapt to changes in environmental temperature. The vibration also makes the palms sweaty and the nails are crisp. When the vibration is too strong, the driver will feel the arm muscles squatting, shrinking, causing changes in the bones and joints, resulting in decalcification, localized bone hyperplasia or deformed arthritis. Strong vibration and noise will stimulate the human body for a long time, which will cause autonomic dysfunction and nausea and insomnia. Female drivers may also experience menstrual disorders, dysmenorrhea, miscarriage, uterine prolapse, etc. Medically, the disease caused by such vibrations is often called a shock disease. In order to prevent the occurrence of vibration, drivers must wear line gloves or thick double-layer cotton gloves when driving, thus reducing the direct contact between the hand and the steering wheel to cushion the vibration of the vehicle's opponents and the human body. careless. In addition, you can also install a flexible cushion on the driver's seat or backrest, or take a short break after working for a while to relax the tension muscles and move your finger joints to prevent the occurrence of vibration. Therefore, everyone pays more attention to the knowledge of car maintenance, it is good for themselves, every part of the car must be maintained in time, in order to prevent the occurrence of danger, the car owners can pay attention to it!
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What is the standard driving posture?
After getting on the bus, the body will be aligned with the steering wheel and kept straight, and the back will be lightly placed on the back chair. At this time, the seat can be adjusted to the appropriate state according to the height, and the seat belt can be fastened according to the regulations. Second, the two eyes are looking straight ahead, the left hand gently grips the upper left of the steering wheel (the truck is at 910 points), the right hand gently grips the upper left of the steering wheel (the truck is at 34 o'clock) and both hands relax naturally. At this time, the left and right hands are large. The thumb should naturally extend straight against the upper part of the steering wheel rim, and the remaining four fingers should be lightly gripped from the outside to the inside. Third, the left foot is placed under the clutch pedal, and the right foot is placed on the accelerator pedal 2/3. In short, the seat is relaxed, comfortable, and natural, and the movement is coordinated and flexible.
How to identify the fault from the steering wheel? 
Fourth, the direction is floating. It is often caused by the front wheel swaying head during driving. When the vehicle reaches a certain high speed, the steering wheel is shivering or shimmy. The reasons for the steering wheel tire or tire repair are that the front wheel assembly dynamic balance is destroyed. When the parts are loose, the dynamic balance of the drive shaft assembly is broken, the shock absorber fails, the stiffness of the leaf spring is inconsistent, the steering mechanism is worn loosely, and the front wheel is improperly calibrated.
How to make the steering wheel do whatever you want?
When the vehicle is driving on the right side, in order to prevent the head from being skewed to the right, the steering wheel should be turned left to no swimming clearance, that is, it disappears to the left side, so that the left hand can feel the position of the vehicle at this time (ie, the feeling of the car).
Second, develop a good habit of not moving the steering wheel. When correcting the direction, it is necessary to make a timely word. It should not be too late, and the amplitude is moderate. Generally, it should be earlier in the positive direction, and the amplitude should be small. Then, use a little force to stabilize the steering wheel.
Third, make full use of a reference object in the front of the car (such as the car tank cover, etc.). When the reference object is in the middle or side of the road, it should be able to correctly feel the position of the vehicle at this time to determine the timing and magnitude of the direction or direction of the vehicle.
Fourth, it is necessary to make full use of the role of the residual light of both eyes to overcome the phenomenon that the eye is far behind or deadly staring near the front of the car, resulting in a later timing of correcting the direction.
Fifth, combined with field training, the timing and speed of training the direction of rotation, such as 8-shaped, S-shaped and right-angled turns. 
Reminder: Prevent the vibration of the steering wheel
