Couplings on the steering shaft help to isolate the steering wheel from road noise and shock.

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The main idea is that the steering shaft coupling acts as a flexible link that transmits torque while damping vibrations. By allowing a small amount of elastic movement, it absorbs road shocks and vibrations so they don’t travel directly to the steering wheel. This keeps the driver’s hands from feeling rough road texture and helps maintain smoother steering feel. The coupling’s job isn’t to add steering effort; it’s designed to pass the steering torque while isolating the wheel from harsh inputs. It may slightly affect feedback, but that isn’t its primary purpose—its primary function is vibration and shock isolation.