JPS6452593A - Steering device - Google Patents

Abstract

PURPOSE:To reduce the resistance of a rudder plate especially at the time of going ahead, in a steering device in which the rudder plate area under water can be automatically regulated by the change of steering angle, by constituting it so that when the rudder shaft having been provided with the rudder plate at its lower end is moved up and down, at the same time the rudder shaft can be turned along a spiral locus. CONSTITUTION:In the stern part of a hull 1, the rudder shaft 3 having a rudder plate 2 at its lower end is supported by a rudder support 4 fitted to a hull 1 so as to be movable up and down and turnable, and this is moved up and down by the operation of a hydraulic cylinder 5. In the guide plate 6 fixed on the hull inside of the rudder support 4, a slide plate 7 which is slidably moved by a solenoid 8 is inserted, and either of projections 71, 72 provided thereon so as to be opposite in the diametrical direction is engaged with either of a pair of spiral grooves 31, 32 having been formed on the outer circumferential surface of the rudder shaft 3 so as to have reverse directions each other. And it is so contrived that by operating the hydraulic cylinder 5 under engaged condition of the projections 71, 72 with the grooves 31, 32, the rudder shaft 3 is lowered while being turned, so that the steering angle of the rudder plate 2 can be changed.