What type of joint allows for flexibility in steering systems?

A universal joint is designed specifically to allow for flexibility in steering systems. It serves as a coupling that can transmit rotary motion and allows for the misalignment that occurs when the steering components pivot or move. This joint enables the steering shaft to maintain a connection with the steering gear, even as the wheels turn and the steering column may not remain perfectly aligned.

The nature of the universal joint's design permits angular movement in multiple directions, which is essential for maintaining smooth steering action as the vehicle navigates turns or uneven terrain. This flexibility is vital for transmitting power and motion while accommodating the various angles that can result from vehicle dynamics.

Other components, like ball joints and tie rods, have specific roles within the steering and suspension system but do not inherently provide the same type of flexible movement that a universal joint does. Ball joints primarily facilitate pivoting at the wheel assembly, while tie rods connect various sections of the steering gear to the steering knuckle, maintaining alignment and stability rather than angular flexibility. Control arms serve to position the wheel while providing a pivot point but are not designed for angular motion like a universal joint.