Wheel positioning adjustment method of independent
???????Due to the structural difference between the independent suspension and the non-independent suspension, the adjustment method is also completely different.
1. Front wheel toe adjustment
????The front toe is adjusted by the length of the left and right tie rods. When adjusting, the steering wheel should be dialed first, and the position of the steering wheel should be locked and fixed. After the correct toe-in value is obtained, the alignment should also be adjusted. The length difference between the left and right tie rods should not be greater than 3mm. If the lengths of the left and right tie rods are not equal, the steering angle will change. When an independent suspension car adjusts the toe, it cannot use the method of jacking up the front axle to suspend the wheels, and can only push the wheels to rotate half a circle on the ground.
2. Adjustment of wheel camber, caster angle and kingpin angle
?????For cars with independent suspension, if you want to increase the camber of the positive wheel, you need to move the upper angle out or move the lower ball hinge in. To increase the positive kingpin angle, you need to move the upper ball hinge backward or the lower ball corner forward. The relationship between the camber angle of the kingpin and the camber angle of the wheel has been determined by the structure of the steering knuckle during vehicle design. Therefore, there is generally no need to adjust the camber angle of the kingpin. After the camber angle of the wheel is adjusted, the camber angle of the kingpin is naturally correct.
??????Adjustment of positioning angle parameters For vehicles of different structures, the adjustment method of the positioning angle is also different, and there are great differences. The various adjustment methods are summarized into the following five categories for explanation:
?????(1) Move the upper and lower swing arm adjustment method. This structure has a long hole in the bracket or the upper (lower) swing arm support. Loosen the fixing bolts and move the upper (lower) swing arm to change the camber angle of the vehicle. The adjustment of the wheel positioning of Shanghai Santana car belongs to this kind. It is adjusted by the movement of the long hole of the lower swing arm of the spherical joint seat.
?????(2) Adjustment of sliding column independent suspension. There are three long holes on the spring of the upper support pillar of the suspension pillar. Loosen the fixing nut and move the suspension pillar along the long hole with a socket wrench to adjust the camber angle of the wheel. After adjustment, tighten the adjusting nut with a torque of 25N.m. Some vehicles have a ramp stop at the upper support. Loosen the fixing bolts, press the ramp stop, and rotate it in a certain direction to make the support rod slightly deviate from the center position, you can change the camber angle of the wheel.
?????(3) Support rod-cam adjustment method, adjustment of the support rod: shorten or increase the length of the support rod, you can change the caster angle of the kingpin. When the support rod is shortened, the lower swing arm is pulled forward, increasing the backward tilt angle, otherwise, the backward tilt angle is reduced. The camber angle of the wheel is to use the lower swing arm to fix the inner cam, so that the lower swing arm moves inward or outward to change the camber angle of the vehicle.
????(4) Increase or decrease the gasket adjustment method. For the coil spring type independent suspension, the adjusting shim is often installed at the joint of the upper swing arm shaft and the frame. If the gasket is moved from the front end to the rear end, the caster angle of the kingpin can be increased, and if the thickness of the gasket is changed equally, the camber angle can be adjusted.
????(5) Cam adjustment method. Some cars have 2 bushes on the inner end of the swing arm, 2 fixing bolts and a cam assembly, which are installed on the frame fixing seat. Turn the cam to change the camber angle of the wheel and the caster angle of the kingpin. If the 2 cams rotate in the same direction by the same amount, the upper swing arm can be moved inward or outward to change the camber angle. If one cam is turned or the two cams are turned in opposite directions, the kingpin angle can be changed.