With today's announcement, she has 'set the wheels in motion' for a run for the presidency. [=she has begun to run for president]
You could almost see the 'wheels' turning in his head. [=you could almost see him thinking about how to do something]
They hoped that the tax cuts would 'grease the wheels' of the economy. [=would help the economy work better]
(..) -It's a scout for the Terminators. -Go, drive! The Aerostats heard the music! -Keep it steady! -I've never driven before. Hold the wheel! This thing's pissing me off! Kid! Hold on! If the idea is to stay alive, I'm driving. (..)2009 Terminator Salvation