JPS60163797A - Slow-speed navigational device of ship - Google Patents

Abstract

PURPOSE:To allow a ship to thoroughly reduce its speed and stabilize the operation of a fishing ship by outwardly rotating simultaneously two stacked rudder plate members pivotally supported at one end and applying large resistance to the stream from a propeller. CONSTITUTION:During the normal navigation, the left and right rudder plate members 3c, 3d are closed and are rotated to the left or right with the rudder shaft 4 serving as axis, thereby they can turn the ship with no difference from a conventional rudder plate 3. During the fishing operation, the rudder plate members 3c, 3d are opened to the left and right, thereby the stream fed by a propeller 2 hits the rudder plate members and is prevented from flowing backward, and it is allowed to flow to the left and right. Accordingly, an effective propelling force is not generated, and a sufficiently slow ship speed can be obtained, thus a fishing ship can perform a stable operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a slow-speed navigation device suitable for use in ships that are required to travel at extremely low speeds, such as fishing boats.

[Prior art]

Generally, when a low speed is required, such as on a pole-and-line fishing boat, the output of the propulsion engine is reduced to the minimum. However, this method has a limit sb in maintaining stable operation of the engine or suppressing engine vibration, and cannot sufficiently reduce the ship speed.

[Summary of the invention]

The present invention has been made based on such requirements, and is constructed by superimposing at least two rudder plate members pivotally supported at one end, and simultaneously attaching the two rudder plate members to the outside. The ship is characterized by being configured so that it can be turned toward the ship, and when a low speed is required, the rudder plate members are opened left and right to provide a large resistance to the water flow sent from the propulsion machine.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments. 1 is the hull of a fishing boat, and at the stern is a propeller-shaped propulsion device 2
is provided. Reference numeral 3 denotes a rudder plate υ provided immediately after the propulsion unit 2, which is supported by the hull 1 by a rudder shaft 4 so as to be able to turn left and right.

Here, as shown in FIG. 2, the rudder plate 3 includes a rudder post 3a forming a leading edge, two rudder plate members 3c connected to the rudder shaft 4,
It consists of 3d. The rudder shaft 4 consists of a flexible pipe 4a and an inner shaft 4b, and the four colored flexible pipes are connected to one of the rudder plate members 30,
The inner shaft 4b is coupled to the other steering plate member 3d. Thus, by simultaneously rotating the flexible pipe 4a and the inner shaft 4b in the same direction, the rudder plate 3 can be steered left and right as in the conventional case, thereby turning the direction of the ship. Further, the flexible tube 4a and the inner shaft 4b are rotated by the same angle in opposite directions as shown in FIG.

By turning the two rudder plate members 3a and 3d outward with respect to the rudder post 3&, the entire rudder plate 3 can be brought into a state in which the rudder plate has been turned by 900 degrees.

The configuration for opening and closing the rudder plate members 3c and 3d to the left and right is not limited to this embodiment. For example, as shown in FIG. You can also adjust the area to obtain the required ship speed.

Therefore, 1. During normal navigation, the left and right rudder plate members 3
By closing e and 3d and turning left and right around the rudder shaft 4, the ship can be turned without any difference from the conventional rudder plate 3. Furthermore, if the rudder plate members 3e and 3d are opened left and right during fishing operations, the water flow sent from the propulsion device 2 hits the rudder plate members, is prevented from flowing backward, and is diverted to the left and right, resulting in effective propulsive force. It is possible to obtain a sufficiently low ship speed without causing any problems. Note that although the rudder post 3a is not necessarily necessary, it is used to streamline the cross-sectional shape of the rudder plate 3.

This is a preferred embodiment.

〔Effect of the invention〕

As described above, in a ship in which a rudder plate is arranged behind a propulsion device, the rudder plate is composed of at least two rudder plate members pivotally connected at one end, and one of the two rudder plate members is Since the rudder plate member is configured to be openable and closable with respect to the other side, the rudder plate member can act as a baffle plate for the water flow of the propulsion machine, and a sufficiently low ship speed can be obtained. Furthermore, each rudder plate member is pivotally supported at one end and rotates laterally in the traveling direction about the axis, so that it can be extended outward to a greater extent than in the case where the rudder plate member is pivotally supported at the center. Furthermore, this configuration can be achieved by improving the rudder plate, and has the advantage that the configuration can be significantly simplified compared to the case where a baffle plate is specially provided and the steering plate is advanced and retreated behind the propulsion machine.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a partial side view showing the rear part of the hull, FIG. 2 is a sectional view taken along
Fig. 3 is a cross-sectional view equivalent to Fig. 2 showing the operating state of the rudder plate, Fig. 4 (13, (b) is an external view of the rudder plate showing the operating state, Fig. 5 (a), (b) is an external view equivalent to FIG. 4 showing another embodiment. 1... Hull, 2... Propulsion device, 3... Rudder plate, 4... Rudder shaft, 3a. ... Rudder post, 3b... Support shaft, 3a, 3d... Rudder plate members. Patent applicant: Yamaha Motor Co., Ltd. Agent Masaki Yamakawa (and 2 others) Figure 1, Figure 2 Figure 3

Claims (3)

[Claims] (1) In a ship in which a rudder plate is arranged behind the propulsion device, the rudder plate is constructed by overlapping at least two rudder plate members that are pivotally supported at one end, and the two rudder plate members are simultaneously placed outwardly. A slow-speed navigation device for a ship configured to be able to turn towards. (2) The two rudder plate members are connected to separate support shafts at their front ends,
A slow-speed navigation device for a ship according to claim 1, which is configured to be able to turn outward separately. (3) The slow-speed navigation system for a ship according to claim 1, wherein the front ends of the two rudder plate members are rotatably connected to the front edge member by separate support shafts.