JP4206339B2 - Ship steering structure - Google Patents

Abstract

The invention relates to an arrangement for steering a water-craft, which comprises at least one main propulsion device which is arranged to push the water-craft forward or backward, and a number of steering propulsion devices, the pushing direction of which can be changed. The steering propulsion devices are arranged in the aft of the water-craft on both sides of the said at least one main propulsion device so that the steering of the water-craft is continuously provided by means of the steering propulsion devices without any separate rudder means or the like to be functionally connected to said at least one main propulsion device.

Description

  In accordance with the preamble of claim 1 of the claims, the present invention comprises at least one main propulsion device arranged to propel a ship in the longitudinal direction and a plurality of steering propulsions capable of changing the propulsion direction. The present invention relates to a ship steering structure including a device.

  By ship or ship is meant here any kind of marine vehicle, for example a cruiser, passenger ship, icebreaker, various cargo ships. The ship is equipped with two mechanically connected propellers with steering plates or ladders at the rear and two or three independent pod propulsion devices or propellers, behind which reverse rotation to the pod propulsion device The structure provided with the propeller is already well known. The last-mentioned apparatus is described in WO Publication 01/54971, in which the pod propulsion unit is indicated by 4 and the propeller is indicated by 3.

  Prior art solutions have considerable drawbacks. First, the mechanical propeller structure has a long shaft line and a shaft support outside the ship's hull, which generates a non-uniform wake.

  Steerable ladder-propeller devices or pod propulsion devices have become increasingly common on ships. Since these devices are pivotable, their propulsive force can be used to steer the ship.

  A disadvantage of the electrical configuration of two or more pod propulsion devices is that they are expensive because an effective pod propulsion device requires an engine driven generator with an output control system. They are expensive, heavy and large. For example, in the RoRo ship, the engine room and the mechanically required space are partially arranged above the cargo deck, making the cargo operation more difficult. This means that some disadvantageous narrow portions are formed in the cargo space, thereby leaving the rear end of the cargo space narrow. A heavy electrical machine further results in a disadvantageous positioning of the drainage center of gravity in the longitudinal direction.

  There is only one steering device for the counter-rotating pod / propeller combination, which is often considered disadvantageous in terms of reliability.

  The object of the present invention is to eliminate the disadvantages of the prior art, to provide a new solution that is advantageous in terms of cost and that, when applied, allows good use of space for ship cargo. .

  The object of the invention can be achieved as disclosed in claim 1 and in the other claims. According to the present invention, the steering propulsion device is disposed on both sides of the at least one main propulsion device at the stern of the ship so that the steering of the vessel is functionally connected to the at least one main propulsion device. This is done continuously by the steering propulsion device without the need for any separate steering device.

  The present invention is based on the use of a steering propulsion device that can turn on a ship, and these steering propulsion devices perform a steering action independently and are further involved in forward movement of the ship. Most of the propulsive force in the forward and reverse directions is generated by another propulsion device, such as a large propulsion unit or a plurality of large propulsion units. An important advantage of the solution according to the invention is the fact that the upper end of the propulsion device is fitted below the cargo deck. Since the complete electric machine of a conventional large pod propulsion device is heavier and larger than the machine used according to the present invention, the present invention does not allow for increased cargo acceptance and further handling of cargo. To be efficient and easy. Furthermore, this solution is technically more economical and easier to implement than known solutions. Cargo decks are lower, making ship dimensions more economical, and two propulsion units give higher reliability compared to one central propulsion unit, especially with respect to maneuverability of passenger ships It is important. Furthermore, if separate main propulsion devices and steering propulsion devices are provided, complementary outputs are not unnecessarily used in maneuvering.

  According to the present invention, an even number of steering propulsion devices are provided, and the propeller portions of these steering propulsion devices are arranged in a stationary state outside the ship hull. One or more main propulsion devices are provided, for example, a propeller or a water jet device functions as the main propulsion device.

  At least one main propulsion device of the ship is basically arranged in the center of the stern of the ship, and the steering propulsion devices are arranged on both sides of the propulsion device and arranged in a lateral portion of the ship close to the side plate. High efficiency is obtained when the main propulsion device is arranged as far as possible at the stern of the ship and when no projecting part to increase resistance is required on the rear side of the main propulsion device. Since no shaft bearing is required, a uniform wake is formed. Steering propulsion devices provide excellent maneuverability even in harsh weather conditions and even at slow speeds, for example, less than 5 knots.

According to the present invention, the output of the steering propulsion device need not be high. The output obtained with the steering propulsion device is less than 50% of the common (ie joint or total) shaft output of the main propulsion device and the steering propulsion device. Shaft output is herein up, i.e. means conventional an output obtained from the apparatus in standards output of the main propulsion device and the steering propulsion device, which can be measured at the outlet shaft of the device. The propulsion device itself is connected to the prime mover by horizontal and substantially horizontal shaft (s). Prime mover can be more than a group of diesel engines, electric motors or gas turbine engine.

  Furthermore, since the steering propulsion devices can be installed on both sides of one or more main propulsion devices substantially near the outer skin of the ship, they are relatively small and therefore below the cargo space of the ship. Can be installed. By doing so, a space can be formed below the cargo space for maintenance and inspection of the steering propulsion device.

  Other alternative solutions are also conceivable. In this case, for example, if the ship is high-speed, one or more water jet devices can be provided in the central portion as a main propulsion device. Also in this case, the steering propulsion device is arranged on the side, and most of the output used for forward movement is provided by the main propulsion device.

  The present invention will now be described by way of example only with reference to the accompanying drawings.

  According to FIGS. 1A and 1B, this structure is formed by a ship or ship 1 together with a steering propulsion device 2 and a main propulsion device 3. In this solution, an even number of steering propulsion devices are arranged very close to the outer skin 6 of the ship. The diesel engine indicated by reference numeral 4 functions as a prime mover of the main propulsion device, and its output is transmitted to the main propulsion device by the shaft 5. In the solution according to the present invention, the steering propulsion device does not need to be large, so that a large space is not required, and the maintenance space 8 required by them is inspected by the maintenance personnel 7 inside. In this case, the steering propulsion device can be repaired, and is advantageously arranged below the cargo space 10. In this way, the entire cargo space can be used, and there is no narrowing part that has been required so far. For example, loading the cargo on the loaded truck and other cargo vehicles 9 can reduce the total area. Can be used to the fullest.

  In FIG. 2A, the upper drawing shows one main propulsion device 3 and steering propulsion device 2. Further, examples of two steering propulsion devices are shown at different positions 2a and 2b. When the steering propulsion device is in position 2b, the boat turns in the desired direction. If it is necessary to promote this turning, the other steering propulsion device 2 is also rotated to the position 2b at the same time as the previous device. In FIG. 2B, one main propulsion device 3 is replaced by two separate main propulsion devices 3a, 3b.

  In FIG. 3a, in addition to the steering propulsion device 2, another solution to the conventional propeller is given, and in this respect the water jet device 11 is used as the main propulsion device. FIG. 3B is a complementary variation of FIG. 3A, in which there are two or more water jets 11a, 11b, 11c in this solution. It is also advantageous to install two water jets 11a, 11c.

  Within the scope of the present invention, solutions different from those described above can be implemented. The solution can be applied to all types of ships. For example, in warships and cruisers, the solution allows for diversified drive configurations. The main prime mover of the steering propulsion device can also be arranged above the cargo deck, for example around the chimney, which facilitates the supply of electricity to the rest of the ship. In a cruiser, this allows for a flexible distribution of power between residential areas and propulsion devices.

  It will be apparent to those skilled in the art that the present invention is not limited to the embodiments described above, and that different applications are possible within the scope of the inventive idea defined by the claims.

1A and 1B show a ship with a structure according to the invention as a side view and a view from below. 2A and 2B show other solutions for the main propulsion device and the steering propulsion device. 3A and 3B show yet another solution for the main propulsion device and the steering propulsion device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ship 2 Steering propulsion apparatus 3 Main propulsion apparatus 4 Diesel engine 5 Shaft 6 Outer plate 7 Maintenance personnel 8 Maintenance space 9 Mounted truck and other freight vehicles 10 Cargo space 11, 11a, 11b, 11c Water jet device

Claims (6)

A steering structure for a ship (1) comprising a RoRo ship having at least a cargo space (10) at the stern, wherein the at least one main propulsion device is arranged to propel the ship (1) forward and backward. (3, 3a, 3b, 11, 11a, 11b, 11c) and, seen including a steering propulsion device of the even capable of changing the propulsion direction (2), the steering propulsion devices (2) at the stern of the ship (1) At least one main propulsion device (3, 3a, 3b, 11, 11a, 11b, 11c) is disposed on both sides of the at least one main propulsion device (3, 3a, 3b, 11, 11a, 11b, 11c). The vessel (1) is steered continuously by the steering propulsion device (2) without the need for any separate steering device to be functionally coupled, and the steering propulsion device (2) Output that is determined in the at least one main propulsion device (3, 3a, 3b, 11, 11a, 11b, 11c) and a common less than 50% der shaft output of the steering propulsion devices (2) is, the steering propulsion devices A steering structure characterized in that (2) is installed below the cargo space (10) of the ship (1) . The device according to claim 1, characterized in that the propeller part of the steering propulsion device (2) is arranged in a stationary state outside the hull of the vessel (1).   3. The device according to claim 1, wherein the propeller (3, 3a, 3b) or the water jet device (11, 11a, 11b, 11c) functions as a main propulsion device.   At least one main propulsion device (3, 3a, 3b, 11, 11a, 11b, 11c) of the ship (1) is basically arranged at the stern center portion of the ship (1), and the steering propulsion device (2) is provided to the ship. The structure according to any one of claims 1 to 3, wherein the structure is basically disposed on a side of the stern of (1). Said at least one main propulsion device (3, 3a, 3b) is according to any one of claims 1, characterized in that it is connected to a prime mover (4) by a shaft (5) to claim 4 Structure. The steering propulsion device (2) is installed on the ship (1) so that a maintenance space (8) for maintaining the steering propulsion device (2) is formed below the cargo space (10). The structure according to any one of claims 1 to 5.

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