A four-bar linkage consists of four links connected in a loop by four joints (usually pins). These links include: The Frame (Ground): The stationary link. The Input (Crank): The link that receives the initial motion. The Output (Rocker): The link that performs the final movement. The Coupler:
A comprehensive 4-bar link calculator typically offers: 4 bar link calculator
These are advanced tools used when you know the motion you want but not the link lengths . For example, you might input "I want the rocker to rotate 45 degrees while the crank rotates 90 degrees." The calculator then reverse-engineers the link lengths required to achieve this. This is known as "motion generation" or "function generation." A four-bar linkage consists of four links connected
For specialized applications like automotive builds, specific geometry is key. For example, in a triangulated 4-link suspension The Output (Rocker): The link that performs the
The transmission angle is the angle between the coupler and the follower. It is a measure of the mechanical efficiency of the linkage. Ideally, you want this angle to be near 90 degrees.