First, the purpose

Standardize the company's use of non-contact four-wheel aligners to improve product quality. Instrumental operation is used instead of traditional manual tape measure to achieve precise positioning of the front and rear axles.

Second scope of application

Applicable to the positioning of the front and rear axles of our company's chassis workshop, the measurement of the front and rear wheelbase, and the adjustment of the toe.

Three content

A) Installation before measurement

1 Install the self-aligning ruler so that the center of the ruler is on the center of the body. The hanger is symmetrical.

2 Install the extension rod again, with the bubble side facing outward, observe whether the bubble is at the center. If not, adjust the hanger to make the extension rod horizontal, then put the target into the positioning pin, symmetrical, consistent, "0" scale outward .

3 Install the wheel clamps in the same way, avoiding tin blocks and irregularities; insert the laser transmitter into the mandrel and get stuck in the mandrel recess.

B) Rear axle measurement

1 Lift the rear axle and make the coaxiality. Place the target on the ground 4-6 meters away from the laser.

The first step: the black button is facing up, the laser is facing up, the tire is rotated to make the laser hit the target, and the target is moved to make the laser hit at 200;

Step 2: The black button is facing up, the laser is facing down, the tire is rotated to make the laser hit the target, the value X is read, the value of (200+X)/2 is calculated, and the target is moved to make the laser hit (200 On +X)/2, adjust the horizontal button to make the laser hit at 200;

The third step: the white button is directed upwards, the tire is rotated to make the laser hit the target, and then the horizontal button is adjusted to make the laser hit at 200;

Step 4 (check): Rotate the tire to level the fixture, rotate the laser to make the laser hit the target, if the reading is within 200±1, or keep the laser on the target, rotate the tire, if the laser always hits Qualified within 200 squares.

2 Lower the rear axle and measure the level of the axle with a level gauge. If it is not flat, estimate the difference and add the gasket to the lower tire.

3 Measure the toe, read the readings of the four targets, and make a record. The readings should not be confused; then calculate according to the table:

Left front (A 1 ) - left rear (B 1 ) = left reading difference (C 1 )

Left reading difference (C 1 ) ÷ target distance ( D m ) = left fore bundle ( C 1 /D m )

Right front (A 2 ) - right rear (B 2 ) = right reading difference (C 2 )

Right reading difference (C 2 ) ÷ target distance ( D m ) = right front beam ( C 2 /D m )

Total toe = left toe (C 1 /D m ) + right toe ( C 2 /D m )

Simplified algorithm: total toe = [left front (A 1 ) - left rear (B 1 ) + right front (A 2 ) - right rear (B 2 )] ÷ target distance (D m )

4 Measure the axle deflection and calculate according to the data obtained in the previous step: axle deflection = [right fore bundle ( C 2 /D m ) - left fore bundle ( C 1 /D m )]÷2

5 Measure the wheel camber angle, start from the left side, insert the angle measuring instrument into the mandrel and keep it vertical; press the “angle selection button” (the first indicator on the right side lights up) to select the wheel camber, press “measurement direction” ( The left indicator of the first button in the middle is on.) Select left, press the “wheel camber measurement button” (the second button in the middle) to measure the angle, and record the obtained reading on the form; the measurement method on the right side only needs to “left”. "Change to "right."

C) Front axle measurement

1 Attach the fixture to the front axle and lift the front axle;

2 Adjust the coaxiality, the same method as the rear axle;

3 The bottom corner turntable at the bottom of the front wheel, lower the axle, use the level to measure the level of the axle, if it is not horizontal, it needs to be adjusted;

4 First measure the toe and wheel tilt, the same way as the rear axle;

5 Adjust the parallelism between the left wheel and the body. Method: Turn the steering wheel so that the reading of the left laser on the front and rear targets is within 1 grid;

6 Place the corner meter, place the corner meter directly under the left and right mandrels, rotate the laser, so that the laser always hits the zero line;

7 Turn the steering wheel (about one and a half turns) to make the left wheel 20° to the left. Method: When estimating the left wheel to 20 degrees to the left, select the laser to make the laser hit the “zero line”, then translate the angle meter to make the laser Hit the "zero point" and rotate the laser to compare the angle to 20°. Then rotate the steering wheel appropriately, repeat the above operation until the laser strikes at 20°. At this time, the right wheel angle can be read from the right side, and the right turn angle can be subtracted from 20° to obtain the left turn angle difference;

8 Insert the vertical value of the angle measuring instrument into the spindle and lock it. Press the “angle selection button” (the third indicator on the right is on) to select the kingpin tilt, press “measurement direction” (the left indicator of the first button in the middle is on) Select left, then press “Left wheel turn 20° to the left” (the third button in the middle, the steering of the left wheel should match the diagram on the angle measuring instrument), then “OK” will be displayed on the angle measuring instrument;

9 Do not put on the brakes, turn the steering wheel to the right (about three turns), turn the left wheel to the right 20° (the adjustment method is the same as the left wheel 20°); after adjusting, press the left wheel to turn right 20 ° (the fourth in the middle) can get the caster camber and camber angle of the left wheel; press the “angle selection” button at this time, the second indicator light is on, indicating the caster angle, and the third indicator is on. Main pin inclination angle;

10 Kill the steering wheel to the right, and the laser can read the maximum steering angle to the left on the corner meter;

11 In the same way, simply change the corresponding “Left” to “Right” to get the right steering angle difference of the front axle, the caster caster angle, the kingpin camber angle, and the maximum steering angle to the right.

D) Note:

1 Self-aligning ruler must be perpendicular to the body and coincide with the center;

2 The extension rod must be kept horizontal;

3 The measured bridge must be horizontal (or the same height of the left and right wheels);

4 coaxiality must be done;

5 The brake must be pressed during the rotation of the steering wheel;

6 Do not touch the angle measuring instrument during the process from the angle measuring instrument to “OK” to the main pin inclination. Otherwise, it must be done.

Need to adjust when there is deviation of the laser, the adjustment method:

1 First hit the laser on the target at 4-6 meters and move the target to make the laser hit 200;

2 Take the laser horizontally and rotate it 180° and insert it again. Rotate the laser to hit the target and read a value “Y” (if Y=200, the laser has no deviation), and calculate the value of [Y+200]÷2. Moving the target to strike the laser at this value;

3 Adjust the laser with a hex wrench to make the laser hit 200;

4 Move the target closer, rotate the laser and move the target to make the laser hit 200, then take out the laser, rotate it 180° horizontally, re-insert the mandrel, and then hit the laser on the target;

5 Observe if the reading is close to 200. If it is not close, you need to do it again.