The invention discloses a
tail rudder of an
underwater vehicle, which comprises a housing, a steering gear, a steering gear mounting plate, a
tail wing plate, a steering gear plate shaft, a steering gear plate, a
bevel gear and a steering gear shaft. Three steering gear lug plates and three
rudder shaft lug plates are uniformly arranged at equal distances in the housing; three
rudder platforms arearranged on the outside, and rudder shaft lug plates are arranged on the inside of the rudder platforms; the steering mounting plate is screwed on the steering gear lug plate, and three groups of steering gears are arranged on the steering gear mounting plate; at that out end of the rudder platform and the steering gear plate
bevel gear, a flap rudder is arranged; and at the outer end of the rudder platform and the rudder plate
bevel gear, a flap rudder is arranged. The steering gear bevel gear and the rudder plate bevel gear are mutually meshed and driven. The invention adopts a three-axis rudder
tail rudder arrangement mode, which saves cost and improves
system reliability. The control model is simplified and the control difficulty is reduced; it has compact structure and high stability. The rudder plate adopts the flap structure to improve the rudder efficiency and the
attitude control ability of the
underwater vehicle. The
electromagnetic interference is reduced, the stress structure of the rudder shaft is improved, the damage probability of the rudder shaft caused by the trailer is reduced, and the safety of the rudder shaft is improved.