Speed sensing device, gearbox and vehicle

The utility model relates to the technical field of automatic gearboxes, in particular to a speed sensing device, a gearbox and a vehicle. The speed sensing device comprises a planet carrier and a rotating speed sensor. The planet carrier is in transmission connection with an output shaft of the gearbox; a plurality of parking teeth are evenly distributed on the peripheral side of the planet carrier and right face the parking mechanism. The rotating speed sensor is arranged on a gearbox shell, and the rotating speed sensor is right opposite to the parking teeth. According to the speed sensing device, the parking teeth are arranged on the planet carrier, so that the gearbox has more compact part layout, and the layout scheme of the gearbox is optimized; meanwhile, the parking teeth serve as induction gears of the speed induction device, the layout scheme of the gearbox is further optimized, the parking teeth on the planet carrier are shared by a parking mechanism and a rotating speed sensor, and the space util