A connector and an electronic device that includes the connector are described. The connector includes a first helical gear for connecting with a first part of an electronic device; a second helical gear for connecting with a second part of the electronic device; and an intermediate helical gear located between and engaged with the first helical gear and the second helical gear, wherein axes of the first helical gear and the second helical gear are parallel to each other, and an axis of the intermediate helical gear is orthogonal to that of the first helical gear and the second helical gear, so that the first helical gear and the second helical gear are rotatable synchronously via a rotation of the intermediate helical gear, wherein the first helical gear and the second helical gear are engaged with the intermediate helical gear via respective line contacts.