A universal track adaptor system having a shell including a portable device receiving surface arranged for receiving and detachably holding a portable electronic device, said shell further including a track facing surface, a plurality of wheels including a first wheel and a second wheel; a first track adaptor rotatably coupling said first wheel and said second wheel to said track facing surface, said first track adaptor having a specific range of motion, said first track adaptor including an adaptive mechanism operable to adjust a specific width between said first wheel and said second wheel through said specific range of motion, whereby said first wheel and said second wheel can be adapted to interface with a plurality of different sized tracks, as permitted by said specific range of motion.

A driving device for a toy vehicle according to the present disclosure is a driving device for a toy vehicle, and includes: a first rotating body configured to be rotatable around a first rotation axis by a motor, the first rotating body having a wall portion formed to have a surface whose distance from the first rotation axis gradually decreases along a circumferential direction about the first rotation axis; a second rotating body configured to be rotatable around a second rotation axis by being pressed by the surface of the wall portion that rotates; and a third rotating body configured to be rotatable around a third rotation axis by the second rotating body.

A driving device for a toy vehicle according to the present disclosure is a driving device for a toy vehicle, and includes: a first rotating body configured to be rotatable around a first rotation axis by a motor, the first rotating body having a wall portion formed to have a surface whose distance from the first rotation axis gradually decreases along a circumferential direction about the first rotation axis; a second rotating body configured to be rotatable around a second rotation axis by being pressed by the surface of the wall portion that rotates; and a third rotating body configured to be rotatable around a third rotation axis by the second rotating body.