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]
(..) hidden not only in space, but also in time. The clock is the key. My God. "Return the eye into the stone's embrace... the wheel of heaven will turn." "Exhume the light from its watery grave, to receive the gift of heaven as you are condemned to the depths of hell." (..)2001 Lara Croft: Tomb Raider