automotive wheel alignment
1, ☆ wheel alignment effect:
When the vehicle is used for a long time, users find the direction of the steering heavy, trembling, when deviation, is not correct, not homing or unilateral tire wear, wavy wear, wear massive, uneven wear, which are not normal wear and tear, as well as when the user is driving the car a sense of floating, bumps, swing and other phenomena, you should consider check wheel alignment values, see if too much deviation, timely repair.
comprises a positioning wheel caster angle, kingpin angle, camber and wheel toe four contents. Positioning wheel includes a rear wheel camber and toe-by. Such positioning of the front and rear wheel alignment positioning collectively called, it is often
said wheel alignment. Wheel Alignment is the role of the automobile driving stability and steering straight light and reduce the car tires in motion and turned to mechanical wear and tear.
2, the caster angle:
From the side of the wheel, the kingpin (center of rotation when the steering wheel) falling backward, called kingpin inclination. After setting the king pin inclination, the projection points generated between the ground and the ground point of the wheel center from the centerline of the kingpin (referred to as a kingpin pitch shift distance, the same as with the front wheel of the bicycle fork beams inclined rearwardly principle), the grounding point of the wheel located on the rear end of the kingpin extension line, it is pulled back against the wheel in the rolling resistance with the natural direction of the wheel toward the traveling direction. Setting caster angle greatly improved straight running performance, while the main pin increases from pitch shift. Kingpin pitch shift distance is too large, heavy steering wheel, and road surface disturbance due to the front and rear wheels exacerbated bumps.
3, kingpin angle:
the tire when viewed from the front and rear directions, a kingpin inclined inward of the vehicle body, the inclination angle is called kingpin. When the wheel is rotated through the kingpins, the lowest point of the wheel into the road surface, the wheels but in fact can not fall into the lower edge of the pavement, but the steering wheel along with the full lift up the front of the vehicle a corresponding height, so the car itself to gravity effects of the steering wheel to return to the original neutral position of the steering wheel and thus easily reset.
In addition, further kingpin angle and the road surface so that the kingpin axis from the intersection to the center plane of the wheel and the ground line personally reduced, thereby reducing the force applied to the steering wheel when the driver steering the steering light, it can also reduce the impact force transmitted from the steering wheel on the steering wheel. But Kingpin inclination should not be too large, otherwise the accelerated tire wear.
4, camber:
when seen from the longitudinal direction of the wheel, the tire is not mounted vertically, but slightly poured presented “eight” shape open, referred to as negative camber, and He said it is time to open camber in the opposite direction. Peak slash tires, since the inclination of the tire ground-contacting ease of operation of the steering wheel, so that comparatively large camber angle is provided. Now the car will generally camber angle is set to be small, nearly vertical. Flat radial tire for vehicles installed with the growing popularity, due to the characteristics of radial tires (tire tread rigidity, wide tire), when the camber angle is set large bias tires will wear, reduce friction tire. Also due to the power steering mechanism of constant use, but also the camber angle is shrinking. Nevertheless, little camber settings may be applied to a suitable cross-thrust bearings on the wheel axle.
5, front toe:
toes inwardly, so-called “toe-pin” means, refers to the left and right front wheels, respectively, inwardly. With such a structure object camber correction caused by the front wheels to the outside of the rotation. As described above, due to the camber, the steering operation becomes easy. On the other hand, since the wheel is tilted around the front wheelsDo not rotated outward to fix the problem, if the left and right wheels has an inward angle, plus or minus zero, can be kept about two straight traveling, to reduce tire wear.
The four positioning wheel alignment values are indicators. Rear wheel target value and the target value is similar to, but most cars the rear wheel position is not adjustable. What
wheel alignment requirement is
A:? Data and wheel alignment computer data if your vehicle is the same as recommended in the manual is generic. In general, the situation needs to be done in the following wheel alignment.
1, after the repair or replacement of tires in a collision;
2, unilateral partial front and rear tire wear;
3, or floating heavy shaking steering while driving;
4, when the car left or right deviation straight;
5, although no more conditions, but for maintenance purposes, it is recommended to drive the new car after three months, or six months later ten thousand km time.
wheel alignment is one of the content of automotive repair and maintenance work required. Unless there is obvious problems associated with it before doing wheel alignment, such as poor stability straight after wheel alignment You can feel it right away, otherwise it is difficult to judge the feel that you do good. As the current automotive industry varies greatly, service quality vary widely, so we recommend that you try to maintain a good business to ensure the maintenance of the quality of wheel alignment to ensure road safety.
6, when the need to locate
1, the vehicle performance is affected (the driver feel the most direct is wandering, turning the steering wheel does not automatically return to be considered a).
2, and the resulting suspension chassis damage due to an accident.
3, tire wear appears abnormal (but it should also take into account whether the tire pressure is not normal because it leads to abnormal wear, under normal circumstances, the central tread tire pressure is too high will exacerbate the wear and tire pressure too low increased wear on both sides of the tread; If the partial side wear occurs, there may be deviation of camber)
4, axle and suspension parts detached too.
7, and its benefits are:
1 enhances driving comfort;
2 reduce gasoline consumption;
3 increases tire life… .
4 ensure straight running stability of the vehicle;.
5 parts of the chassis suspension reduce wear;
6 with enhanced security.