How to calculate the cornering force on the front wheel

1. 1. When the wheel center acts the lateral force FY along the y-axis direction, the lateral reaction force on the ground will be proced, that is, the side slip force FY
rolling of rigid tire under lateral force
e to the lateral elasticity of the wheel, as long as the cornering force appears, the driving direction of the wheel will deviate from the wheel plane, no matter whether it reaches the adhesion limit or not
figure a shows the lateral deformation of the tire when the tire is stationary under the action of lateral force FY. B in the figure, the angle between the center line AA of the tread contact mark and the wheel plane CC α It's called sideslip angle. Proce sideslip angle α The lateral reaction force on the ground at the moment is called the lateral force FY
, cornering force - cornering angle (FY - α curve

2. The cornering force is equal to the centripetal force needed by the car when turning
according to the turning radius and the speed and mass of the car,
the force = mass * the square / radius of the speed can be calculated

3. In this case, you have to do four-wheel alignment. If you want to save trouble, you have to adjust the toe in. If you hold the steering wheel, it will not deviate, but your tires will soon wear out,

4. The tire cornering stiffness is the ratio of the tire cornering force to the cornering angle: k = f / a
where k is the cornering stiffness
F is the cornering force
A is the cornering angle
the cornering stiffness unit is n / rad
rad is the camber angle

when the wheel is installed, it is not installed perpendicular to the ground, but has a certain camber angle, The function is to improve the safety of the wheel and the portability of the steering control mechanism
in addition, the wheel will be subject to cornering force under various road conditions

5. The lateral force makes the wheel deform. When cornering in one direction, the moment proced by tire cornering does make the wheel deflect to a larger angle, which reces the wheel deformation and makes the whole wheel plane coincide with the driving direction

6. The force on the side is not uniform, and the force on different height points is not the same. The farther away from the water, the stronger the force, because the pressure in the water presents a molecular force, the longitudinal gravity is broken down into all directions.

7.

(1) Phenomenon

when the vehicle is running, the front wheel swings left and right, the vehicle is unstable, the direction is unstable, and there is shimmy

(2) cause analysis

① the front wheel toe in value is not correct, and the friction between the wheel and the ground causes the front wheel to swing

(2) the free travel of the steering wheel is too large (e to the large meshing clearance or serious wear of the worm gear, rack and tooth sector in the steering gear), and the vehicle swings e to the change of ground conditions ring driving

(3) serious wear, damage or improper adjustment of the front wheel drum bearing make the front wheel loose and swing

(4) the ball pin of tie rod and tie rod is worn or loose, which causes the wheel to swing when the wheel vibrates

(5) the vertical shaft and bushing of steering knuckle are excessively worn and loose

(3) troubleshooting

① check and adjust the front wheel toe in value

(2) tighten the ball pin of tie rod and tie rod, and replace it if necessary

(3) adjust the front wheel bearing clearance and replace the front wheel bearing if necessary

(4) adjust the engagement clearance of the steering gear

Replace the vertical shaft bushing

8. Horizontal lateral force
horizontal lateral force refers to the lateral force generated between the rail side and the wheel rim or horizontal guide wheel when the gantry crane of the bridge type runs off the track
Chinese name
horizontal lateral force
foreign name
shuipingcexiangli
λ
horizontal lateral force coefficient

9. Tire roll angle: it means that the tire is not perpendicular to the ground, such as the camber angle. This is easy to understand
tire cornering angle: when the tire is vertical to the ground and is driving, the center line of the wheel mark is no longer parallel to the center of the wheel when it is subjected to lateral force, and the resulting angle is the cornering angle

10.

The toe in value of the front wheel is generally no more than 8mm, which is guaranteed by adjusting the length of the tie rod. The toe in of modern cars tends to decrease. When the front wheel camber is negative, the toe in is also negative, that is to say, it becomes the front and rear toe in

The front wheel toe in can be adjusted by changing the length of tie rod. During the adjustment, the distance difference between the front and back of the two wheels can meet the specified toe in value according to the measurement position specified by the automobile manufacturer. Generally, the toe in value between 0 and 12mm is normal. If the car tie rod is straight, you can first loosen the locking bolts at both ends of the tie rod, and use a pipe wrench to twist the tie rod to make the tie rod extend or shorten. When the pull rod extends, the toe in value increases, the pull rod shortens and the toe in value decreases

< H2 > extended data

front wheel toe in

front wheel toe in is to make the front distance of two front wheels less than the rear distance. The distance difference is called toe in value. Looking down from the top of the car, the left and right front wheels form an opening backward; 8; Glyphs