If the left and right wheels jump up and down at the same time, that is, when the body only moves vertically and the suspension deformation on both sides is equal, the stabilizer bar rotates freely inside the liner, and the stabilizer bar is not functional.
When the suspension on both sides deforms unevenly and the vehicle tilts laterally on the road surface, one side of the frame moves closer to the spring support, and the end of the stabilizer bar on that side moves upward relative to the frame, while the other side of the frame moves away from the spring support, and the corresponding end of the stabilizer bar moves downward relative to the frame. However, when the vehicle and the frame tilt, the middle of the lateral stabilizer bar does not move relative to the frame. When the vehicle tilts, the longitudinal parts on both sides of the stabilizer bar deflect in different directions, causing the stabilizer bar to twist and the side arms to bend, thereby increasing the suspension angular stiffness.
If the overall vehicle roll stiffness is low and the body roll angle is too large, a lateral stabilizer bar should be used to increase the overall vehicle roll stiffness. The lateral stabilizer bar can be installed separately or simultaneously on the front and rear suspensions as needed. When designing the stabilizer bar, in addition to considering the overall roll stiffness of the vehicle, the ratio of roll stiffness of the front and rear suspensions should also be considered. To give the car insufficient steering characteristics, the roll stiffness of the front suspension should be slightly greater than that of the rear suspension. Therefore, many car models install a stabilizer bar in the front suspension.
The material selection is generally based on the design stress of the lateral stabilizer bar. Currently, 60Si2MnA material is widely used in China. For the use of high stress lateral stabilizer bars, Japan recommends using Cr Mn-B steel (SUP9, SuP9A), and carbon steel (S48C) for low stress stabilizer bars. To improve the service life of the lateral stabilizer bar, shot peening should be carried out.
To reduce mass, some lateral stabilizer bars are made of hollow circular pipes, with a ratio of approximately 0.125 between the wall thickness and outer diameter of the steel pipe. At this point, the outer diameter of the solid rod has increased by 11.8%, but the mass can be reduced by about 50%.
