The role of four-wheel alignment:
Why do cars do four-wheel alignment is a problem that users and drivers are very concerned about. Let's talk about the structure of the car first. Take most of the four-wheeled vehicles currently on the road as an example. 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 positioning. 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.
The function of four-wheel alignment is to keep the car running smoothly in a straight line and turn lightly, and reduce the wear of tires and steering parts when the car is running. Because the original design and manufacture of four-wheel alignment are different in different automobile manufacturers, the inclination and toe value of each wheel are also different, with adjustable parts and non-adjustable parts; Four-wheel alignment is to detect whether the inclination angle and toe-in value of each wheel of the tested vehicle meet the original factory standard through a four-wheel alignment instrument, and if not, it can be adjusted randomly.
In other words, when the driver feels that the steering is heavy, trembling, running off, incorrect, and not returning to the right, or finds abnormal wear such as unilateral wear, wavy wear, block wear, and eccentric wear of the tire, and the car is drifting, jumping, swaying, etc., it is necessary to consider doing four-wheel positioning.
The design purpose of automobile four-wheel alignment is to ensure that the automobile can automatically keep straight when driving, that is, it has the ability to automatically correct when the wheels turn. For this reason, the steering wheel (usually the front wheel) of an automobile is designed from several angles, such as caster angle, camber angle of the steering wheel and toe-in of the steering wheel, which are collectively called steering wheel positioning angle. Modern automobiles have adopted various new technologies, which have changed the positioning angle of the steering wheel, such as the meridian for tires and the low-pressure flat wide-section structure, so that the tires are greatly deformed by external forces during driving. Some vehicles have diagonal pipeline braking system, front wheel drive and so on. Some make the front wheel alignment angle negative, and some cars have camber toe adjustment. The rear wheels of some cars are independently suspended, and the inclination angle and toe-in can be adjusted. The principle is the same as that of the front wheel.
Steering wheel positioning angle is an important parameter to evaluate vehicle maneuverability and linear driving stability. If the front wheel positioning is not normal, it will not only cause heavy steering, increase the driver's labor intensity, but also make the car unstable, unable to keep driving in a straight line, the wheels lose their automatic righting function, and the car will lose control, leading to accidents. At the same time, it will aggravate the wear of steering mechanism and steering tire, increase fuel consumption and reduce power performance. Therefore, the positioning value of automobile steering wheel is one of the key items of safety inspection, and the four-wheel positioning of automobile must be tested and adjusted regularly. Generally, four-wheel alignment should be done after a new car is driven for three months. Every 1000 km, tire replacement or shock absorber replacement should be done in time after the collision.
Static and dynamic detection of steering wheel positioning value
The detection methods of automobile steering wheel positioning are divided into static detection and dynamic detection. The former uses a four-wheel locator, while the latter uses a sideslip test bench. The so-called static means that the car is stationary. The four-wheel alignment instrument (composed of toe-in meter and inclinometer) is used to detect the toe-in value, caster angle, caster angle and camber angle of the front wheel of the automobile. The instrument is simple in structure, complex in operation and slow in speed. Dynamic refers to the movement of the car, and the matching between the toe-in value of the front wheel and the camber angle of the car wheel is detected by the sideslip test bench (skateboard or drum). It is characterized by complex equipment structure, simple operation and high speed, which is very suitable for rapid detection and is widely used in security inspection lines or comprehensive inspection lines.
What are the requirements for four-wheel alignment?
Answer: If the data suggested in your vehicle manual is the same as that in the four-wheel locator computer, it is universal. Generally speaking, the following situations require four-wheel alignment.
1, after replacing a new tire or repairing a collision accident;
2. Unilateral eccentric wear of front and rear tires;
3. The steering wheel is too heavy or floats and shakes when driving;
4. When going straight, the car deviates to the left or right;
Although there is no such situation, for the purpose of maintenance, it is suggested that the new car should be driven for three months, once every six months or ten thousand kilometers.
Four-wheel alignment is one of the necessary work contents of automobile maintenance. Except in ... >>
Question 2: What is four-wheel alignment? Wheels positioning includes tire dynamic balance, toe-in adjustment, steering kingpin camber, caster and tire camber. In fact, most of the four-wheel positioning done by repair shops now only do the first two items, and the latter items are not easy to do. Some repair shops do not have such equipment. He took advantage of the customer's ignorance of four-wheel positioning knowledge, just fishing in troubled waters.
Question 3: What is the function of automobile four-wheel alignment? Four-wheel alignment is one of the necessary work contents of automobile maintenance. Unless there are obvious related problems before four-wheel alignment, such as poor linear stability, you can feel it immediately after four-wheel alignment, otherwise it is difficult to judge whether it is good or not by feeling. At present, the quality of the auto repair industry is uneven. I suggest you try to go to a better maintenance company to ensure the quality of four-wheel alignment and traffic safety.
Its advantages are: 1. Enhance driving comfort; 2. Reduce gasoline consumption; 3. Increase the service life of the tire 4. Ensure the linear stability of the vehicle; 5. Reduce the wear of chassis suspension fittings; 6. Improve driving safety
Question 4: What is automobile four-wheel alignment? When do you want to do it? The role of four-wheel alignment:
When users use the vehicle for a long time, they find that the steering is heavy, swaying, running off, incorrect, and not righting, or abnormal wear such as unilateral wear, wavy wear, block wear, and eccentric wear of tires, and the car feels drifting, bouncing, shaking, etc. when users drive. They should consider checking the wheel alignment value to see if there is too much deviation and repair it in time.
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 alignment and rear wheel alignment are generally called wheel alignment, and generally
Four-wheel alignment 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.
Inclination angle of king pin:
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:
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. Nowadays, 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.
Foretoe:
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.
What are the requirements for four-wheel alignment?
Answer: If the data suggested in your vehicle manual is the same as that in the four-wheel locator computer, it is universal. Generally speaking, the following situations require four-wheel alignment.
1, after replacing a new tire or repairing a collision accident;
2. Unilateral eccentric wear of front and rear tires;
3. The steering wheel is too heavy or floats and shakes when driving;
4. When going straight, the car deviates to the left or right;
Although there is no such situation, for the purpose of maintenance, it is suggested that the new car should be driven for three months, once every six months or ten thousand kilometers.
Four-wheel alignment is one of the necessary work contents of automobile maintenance. Unless there are obvious related problems before four-wheel alignment, such as poor linear stability, you can feel it immediately after four-wheel alignment, otherwise it is difficult to judge whether it is good or not by feeling. Due to >>
Question 5: What does four-wheel alignment mean? This means that for the two steering front wheels, there is also 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. Four-wheel positioning Four-wheel positioning instruments include toe-in ruler and optical level, cable positioning instrument, CCD positioning instrument, laser positioning instrument and 3D image positioning instrument. Among them, 3D, CCD and laser products are the three mainstream products on the market at present. 3D products are the most advanced four-wheel alignment on the market at present, with advanced measuring methods, only one-fifth of that of traditional aligners, and gradually enter a mature stage. 20 10 will be the first year of 3D four-wheel alignment! At the Beijing Exhibition, the major four-wheel alignment manufacturers have demonstrated their own V3D four-wheel alignment products, and V3D has become the biggest highlight of the exhibition. At present, all major four-wheel positioning manufacturers have launched their own V3D products, and the V3D market war is bound to begin immediately. The measuring ability of V3D exceeds that of optical sensor. In addition to calculating the four-wheel alignment angle, it can also calculate the wheel pitch, wheel difference, wheelbase, axle difference, friction radius, steering trajectory and other functions. Moreover, there are many after-sales optical sensors, and the operation is cumbersome. The appearance of V3D is likely to replace the high-end optical machine market segment. Four-wheel positioning mainstream manufacturers of imported 3D products: Jaben, Hunter Domestic 3D product manufacturers: Guangzhou Wanda, Guangzhou Panther, Tianjin Aoli, [1] Hyde Sanxiong, Beijing Quanta, Qingdao Jinhua, Zhuhai Pilotage and other well-known companies take the high-end market; CCD product manufacturers: including Bess, Shenzhen Jacky, Shenzhen Miller, Zhuhai Zhanshen, Yingkou Dali, etc. Occupy the low-end market. PSD and laser products have gradually entered the upgrading period. Requirements for four-wheel alignment If the data suggested in your vehicle manual is the same as that in the four-wheel alignment computer, it is universal. Generally speaking, the following situations require four-wheel alignment. 1, after replacing a new tire or repairing a collision accident; 2. Unilateral eccentric wear of front and rear tires; 3. The steering wheel is too heavy or floats and shakes when driving; 4. When going straight, the car deviates to the left or right; Although there is no such situation, for the purpose of maintenance, it is suggested that the new car should be driven for three months, once every six months or ten thousand kilometers.
Question 6: What do you mean by four-wheel alignment and dynamic balance? When users use the vehicle for a long time, they find that the steering is heavy, swaying, running off, incorrect, and not righting, or abnormal wear such as unilateral wear, wavy wear, block wear, and eccentric wear of tires, and the car feels drifting, bouncing, shaking, etc. when users drive. They should consider checking the wheel alignment value to see if there is too much deviation and repair it in time.
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 alignment and rear wheel alignment are generally called wheel alignment, and generally
Four-wheel alignment 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.
Inclination angle of king pin:
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:
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. Nowadays, 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.
Foretoe:
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.
What are the requirements for four-wheel alignment?
Answer: If the data suggested in your vehicle manual is the same as that in the four-wheel locator computer, it is universal. Generally speaking, the following situations require four-wheel alignment.
1, after replacing a new tire or repairing a collision accident;
2. Unilateral eccentric wear of front and rear tires;
3. The steering wheel is too heavy or floats and shakes when driving;
4. When going straight, the car deviates to the left or right;
Although there is no such situation, for the purpose of maintenance, it is suggested that the new car should be driven for three months, once every six months or ten thousand kilometers.
Four-wheel alignment is one of the necessary work contents of automobile maintenance. Unless there are obvious related problems before four-wheel alignment, such as poor linear stability, you can feel it immediately after four-wheel alignment, otherwise it is difficult to judge whether it is good or not by feeling. Due to >>
Question 7: What does four-wheel alignment mean? Four-wheel alignment refers to the wheel alignment of modern automobile (including front wheel and rear wheel alignment), that is, wheels, suspension system components and steering system components. The geometric angle and size installed on the car body (frame) must meet certain requirements to ensure the stability and safety of the car and achieve the purpose of reducing the wear and fuel consumption of the car.
Question 8: What does four-wheel alignment mean? Four-wheel alignment: keep the car running straight, the steering wheel is in the middle position, and the turning is smooth and smooth, ensuring the durability of the tires and driving safely without deviation!