Chapter 46, Problem 1RQ

To determine

The working of the stability bar.

Answer to Problem 1RQ

The working of the stability bar is to provide directional stability by reducing the body roll as it runs between the opposite control arms in the suspension system.

Explanation of Solution

The stability bar, commonly known as the sway bar, is a metal rod that travels between the opposite lower and upper control arms in nearly all suspension systems. It reduces body roll, and hence, improves directional stability. The sway bar's arm is pulled up, causing the rod to twist. The torsion then moves the arm at the rod's other end, compressing the suspension on the other side of the car. In turn, the body of the car tends to remain flat.

Further, it looks like U and is connected to the control arms. It helps in transferring the movement between wheels i.e. if one suspension reacts to the road surface, the bar transfers it to the other wheel with the same movement. Now, at the time of jouncing, if both the wheels are in jounce then, the stability bar rolls in its bushings but if only one wheel is in jounce then, the bar twists to lift the frame and the suspension of the opposite side which leads to a reduction in body roll.

Conclusion:

Thus, the above is the working of the stability bar in the suspension system.