2. When you go straight on the straight road, you also need to hold the steering wheel firmly to ensure that the vehicle does not deviate, which means that your car needs four-wheel alignment.
3. When the car is driving normally, it feels like the car body is floating or swaying, just like turning on the rough road, which also means that your car needs to do four-wheel alignment.
When one side of the front and rear wheels of your car is particularly worn, you need to do four-wheel alignment.
5. When the car goes straight, the car pulls to the left or right, indicating that your car needs four-wheel alignment.
6. It is recommended to do a four-wheel alignment after the car is replaced with new tires or after a collision accident, steering or suspension system maintenance.
7. The new car will travel about 3000 kilometers.
Benefits of four-wheel alignment:
1, which ensures the stability of the vehicle and makes driving more fun in control.
2, put an end to traffic accidents caused by vehicle deviation.
3. It can reduce the wear of automobile tires and prolong the service life of tires.
4. It can reduce fuel consumption, because after four-wheel alignment, it can reduce the phenomenon of "eating tires" when the car is driving, so it can also reduce the fuel consumption of the car.
5. Reduce the loss of automobile drive, steering and suspension system, and prolong the service life of these components.
Extended data:
Four-wheel alignment is adjusted according to the four-wheel parameters of the vehicle to ensure good driving performance and certain reliability of the vehicle.
The steering wheel, steering knuckle and front axle of an automobile have a certain relative position, which is called steering wheel positioning, also known as front wheel positioning. Front wheel alignment includes four contents: caster angle, caster angle, camber angle and toe-in of front wheel. This is for the two steering front wheels, and there is a relative position between the two rear wheels and the rear axle, which is called rear wheel alignment. Rear wheel alignment includes camber angle and toe-in one by one. Generally speaking, front wheel alignment and rear wheel alignment are called four-wheel alignment.
Front wheel alignment includes caster angle, caster angle, camber angle and toe-in. Rear wheel alignment includes camber and toe-in one by one. Such front wheel positioning and rear wheel positioning are generally called wheel positioning, which is often called four-wheel positioning. The function of wheel alignment is to keep the car running smoothly in a straight line and steering lightly, and reduce the wear of tires and steering parts when the car is running.
Caster angle of kingpin
Looking at the wheel from the side, the steering kingpin (the center of rotation of the wheel when turning) leans backward, which is called kingpin caster. After the caster angle of the kingpin is set, the distance between the center line grounding point of the kingpin and the ground projection point of the wheel center (called kingpin pitch, which is the same as the principle that the front wheel fork beam of the bicycle leans backwards) is generated, so that the wheel grounding point is located at the back end of the extension line of the steering kingpin, and the wheel is pulled backwards through rolling resistance during driving, so that the wheel direction naturally faces the driving direction. Setting a large caster angle of the kingpin can improve the straight running performance, and at the same time, the pitch of the kingpin also increases. Excessive pitch of the kingpin will make the steering wheel heavy, and the front and rear bumps of the wheels will be aggravated by road interference.
Angle of inclination of kingpin
When the tire is viewed from the front and rear direction of the vehicle, the kingpin axis is inclined to the inside of the vehicle body, and this angle is called kingpin inclination angle. When the wheel rotates around the kingpin, the lowest point of the wheel will fall below the road surface, but in fact, the lower edge of the wheel cannot fall below the road surface, but the steering wheel and the whole front of the car will be raised by a corresponding height, so that the gravity of the car itself will restore the steering wheel to its original middle position, so the steering wheel can be easily reset.
In addition, the inclination angle of the kingpin also reduces the distance from the intersection point between the kingpin axis and the road surface to the intersection point between the wheel center plane and the ground, thus reducing the force exerted by the driver on the steering wheel during steering, making the steering operation lighter and reducing the impact force transmitted from the steering wheel to the steering wheel. However, the inclination angle of the kingpin should not be too large, otherwise the tire wear will be accelerated.
Front wheel camber angle
When looking at the wheel from the front and rear direction, the tire is not installed vertically, but slightly inclined in the shape of Zhang Kaicheng, which is called negative camber, and the one that opens in the opposite direction is called positive camber. In the heyday when diagonal tires were used, the camber angle was set to be relatively large because the tires touched the ground obliquely, which was convenient for the operation of the steering wheel. Cars generally set the camber angle very small, close to vertical. Flat radial tires for automobiles are becoming more and more popular. Due to the characteristics of radial tire (high tread rigidity and wide tread), if camber is set, the tire will be eccentric and the tire friction will be reduced. Due to the continuous use of power steering mechanism, camber angle is also shrinking. However, setting a small camber angle can exert appropriate lateral thrust on the wheel bearings on the axle.
Anterior anterior bundle
Toe value of four-wheel alignment
The toes are inward, and the so-called "inner splayed feet" means that the left and right front wheels are inward respectively. The purpose of adopting this structure is to correct the outward rotation of the wheel caused by the camber angle of the front wheel. As mentioned earlier, steering wheel operation becomes easy due to camber angle. On the other hand, because the wheels are inclined, the left and right front wheels rotate outward respectively. In order to correct this problem, if the left and right wheels have inward angles, plus or MINUS zero, the left and right wheels can keep moving in a straight line and reduce tire wear.
The above four positioning values are all indicators of front wheel positioning. The rear wheel alignment value is similar to the front wheel alignment value, but the rear wheel alignment of most cars is not adjustable. ?
Reference link:
Four-wheel positioning-Baidu Encyclopedia