What component is the worm gear connected to?

The worm gear is specifically connected to the sector gear in a steering mechanism or similar applications. In this context, the worm gear functions as a screw mechanism that converts rotational motion into linear motion when engaged with the sector gear. This type of connection is essential for steering systems, where it helps translate the driver's input from the steering wheel into the movement required to turn the vehicle.

The sector gear, shaped like a portion of a circle, rotates as the worm gear turns, allowing for controlled steering response. This design is advantageous because it permits a compact system with high torque transmission, which is vital in steering applications where precision and reliability are crucial for vehicle safety.

The other options, while relevant to different automotive systems, do not pertain to the specific connection of the worm gear. The drivetrain involves the components that transmit power from the engine to the wheels but does not involve the worm gear directly. A piston is part of an engine's combustion system, and the steering column is primarily the structure that houses the steering mechanism but is not the component directly actuated by the worm gear. Thus, the connection between the worm gear and the sector gear is what makes the correct answer clear.