Seat armrest rotating mechanism and automobile

The utility model provides a seat armrest rotating mechanism and an automobile, and belongs to the field of automobile parts, and the seat armrest rotating mechanism comprises a spline shaft; a housing; a plastic inner core; a spring clip; the output gear is in transmission connection with the spline shaft; the spring bolt is in transmission connection with the output gear, and the spring bolt comprises a spring bolt locking foot and a spring bolt outer rack part; a bolt spring; a reset spring; an outer plastic hoop; the gear outer frame comprises a gear outer frame caulking groove and a gear outer frame rack part, the spring bolt locking foot is embedded into the gear outer frame caulking groove in a locking state, and the spring bolt outer rack part is meshed with the gear outer frame rack part in an adjusting state. The structure of the core part is simplified, the weight of the core part is reduced, and assembling is easy. And the production cost is reduced, the size is small, and the modeling design of t