There are variations on the parallelogram steering gearbox, including worm and roller.

Parallelogram steering gearboxes are a crucial component in various steering systems, particularly in vehicles. The different variations, such as worm and roller gearboxes, cater to specific needs and applications within the steering mechanism.

1. Worm Gearbox: This type utilizes a worm gear, which is a gear consisting of a screw, or worm, that meshes with a toothed wheel. The advantage of a worm gearbox is its ability to offer high torque reduction in a compact size. Moreover, its design allows for self-locking capabilities, which enhances safety by preventing the steering from moving unexpectedly when not actively engaged. This feature makes it suitable for applications requiring precise control, like heavy machinery and certain automotive applications.

2. Roller Gearbox: Roller variants, on the other hand, operate using rollers instead of gears. This configuration can provide smoother operation and reduced friction, leading to a more responsive steering feel. The roller design may also allow for higher angular adjustments and faster response rates, making it preferred in sports cars or vehicles where quick steering response is critical.

In summary, choosing between worm and roller parallelogram gearboxes depends on specific vehicle requirements, including desired response characteristics, load capacity, and safety features.