JPS6347678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rectifier fin installed on the stern shell of a ship to improve its propulsion efficiency.

Conventionally, a rectifying fin has been attached to the stern of the ship as shown in Figure 1, which rectifies the water flow near the stern when the ship is sailing and guides it to the propeller to increase its propulsion efficiency. I'm giving. Figure a is a side view of the stern area, and figure b is a side view of the stern area.
In the AA cross-sectional view, 10 is the hull, 11 is the propeller, and 12
is the rectifier fin. Some of these rectifier fins were equipped with a mechanism to change the inclination in the bow and stern directions, while others were equipped with a mechanism to change the inclination in the ship's direction. However, adjusting the inclination only in the bow and stern directions or only in the ship's side direction does not necessarily provide a sufficient flow straightening effect. Therefore, in the present invention, with one straightening fin, the direction can be changed between the bow and stern direction and the ship's side direction.
In response to changes in water flow, trim, etc., these directions are optimized to equalize the wake distribution, thereby improving propulsion performance and reducing propeller cavitation and hull vibration.

FIG. 2 is a partial horizontal sectional view of an embodiment of the present invention;
Figure 3 is a drawing seen from the bow and aft direction of the ship. Reference numeral 1 denotes a hull outer plate, 2 a fin portion, and 3 a rotatable shaft that passes through the outer plate 1, and the fin 2 is supported by a torque hinge 4 at its tip that protrudes outside the boat. The shaft 3 has a gear 5 at one end that meshes with a pinion 6, and the shaft 3 is rotated by a motor 7. 8 is a bearing for the shaft 3, and 9 is a watertight seal. 4 is the fixed side of the torque hinge attached to the tip of the shaft 3 at a substantially right angle thereto, 4a is its rotation axis, and fin 2 is the arm 2 of the torque hinge.
a is fixed to the rotating shaft 4a so that both directions coincide with each other. 4b is the hydraulic system of the torque hinge.

With this configuration, the present invention has a single straightening fin that functions in both directions, whereas conventionally the straightening fins were separate in the bow and stern directions and in the ship's side direction. The mechanism was simplified to obtain a sufficient rectifying effect, and water resistance due to the fins was also reduced.

[Brief explanation of the drawing]

Figures 1a and b are explanatory diagrams of the concept of fins, and Figure 2 is a partial horizontal sectional view of the fins in an embodiment of the present invention.
Figure 3 is also a drawing seen from the bow and aft direction. DESCRIPTION OF SYMBOLS 1... Hull outer plate, 2... Fin, 3... Fore and aft direction rotating shaft, 4... Torque hinge fixed side, 4a... Broadward direction rotating shaft, 5... Gear, 6... Pinion, 7... Motor,
8...Bearing for shaft 3, 9...Watertight seal, 10
...hull, 11...propeller, 12...straightening fin.

Claims (1)

[Claims] 1. A stern rectifying fin in which the fixed side of a torque hinge is attached to the tip of a rotating shaft protruding in the transverse direction from the outer plating at the stern, approximately perpendicular to this rotating shaft, and a rectifying fin is attached to the movable side of this torque hinge.