The Rocker-Bogie system's the suspension arrangement used in the Mars rovers (mechanical robot) for both the Mars Pathfinder and Mars Exploration Rover missions. It's currently NASA's favored design. The term “rocker” comes from the rocking aspect of the larger links on each side of the suspension system. These rockers are connected to each other and the vehicle chassis through a differential. Relative to the chassis, when one rocker goes up, the other goes down. The chassis mainta… (More on Rocker-bogie)