Which type of gears is commonly found in aircraft landing systems?

Bevel gears are commonly found in aircraft landing systems due to their ability to transmit power between shafts that are set at right angles to each other. This characteristic is particularly valuable in landing gear systems, where space is often limited and the orientation of components requires the transmission of rotational movement from one axis to another efficiently. The design of bevel gears allows for smooth and effective directional changes in motion, which is essential during the operation of landing systems as they need to engage and retract the landing gear reliably while maintaining structural integrity.

In contrast, spur gears are typically used in applications where parallel shafts are involved, and they lack the ability to change the direction of motion without additional components. Rack and pinion gears convert rotational motion to linear motion but are not ideal for the specific requirements found in landing systems. Worm gears provide high torque and low speed with a significant gear reduction but are less common in applications requiring quick changes in positional direction, such as landing gear operations.