bellcrank

A bellcrank is a type of lever that pivots on a central point, with two arms extending from the pivot. It is designed to change the direction of force or motion. Typically, the bellcrank has arms of unequal length, which allows for a mechanical advantage or a change in speed. For example, if a force is applied to the shorter arm, a greater force can be exerted on the longer arm, or vice versa. This leverage allows for amplification or reduction of force.

Bellcranks are commonly found in various mechanical systems. In automotive applications, they are used in steering mechanisms to convert the rotational motion of the steering wheel into the linear motion of the tie rods. In aircraft, bellcranks are integral to control systems, converting pilot inputs into movements of control surfaces like ailerons, elevators, and rudders. They can also be found in bicycle brake systems, where pulling a brake lever actuates a bellcrank to apply force to the brake pads.

The design of a bellcrank allows for flexible and compact arrangements of linkages. By changing the pivot point or the lengths of the arms, engineers can precisely control the input and output forces and displacements. This makes the bellcrank a versatile component for transmitting and modifying motion in mechanical assemblies. They are typically made from durable materials like steel or aluminum to withstand operational stresses.