JPH04135997A - Driving auxiliaries for yacht - Google Patents

Abstract

PURPOSE:To lessen water resistance at the sailing as well as to facilitate the operation of an engine while the stability of a hull is made high by providing both side valves opening/closing a suction and a feed port, respectively, and a jet unit driven by a gasoline engine. CONSTITUTION:In the case of sailing by an engine, an impeller 16 is rotated by an engine 15 with side valves 17a and 17b opened so that water is sucked in from a suction port 10 so as to be jetted out of a jet nozzle 11, by which driving force is thereby generated. And, each surface is flushed with a keel 9 with the side valves 17a and 17b closed so that water resistance is prevented from being generated. In this case, neither propeller nor shaft is projected out of a hull into water, water resistance can thereby be lessened. Furthermore, when the jet unit 13 is operated with the slide valve 17a at the leeward side opened and with the slide valve 17b at the windward side concurrently closed, suction force generated by the suction port 10a or 10b at the windward side can be utilized as stability against the moment caused by wind intending to tilt the hull.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a yacht propulsion auxiliary machine for supplementing the propulsion force of a yacht.

(Prior Art) Conventionally, as a propulsion auxiliary machine for a yacht, for example, as shown in FIG. There is one that drives a propeller shaft 5 that extends rearward from 2 and has a propeller 4 attached to its tip. Alternatively, as shown in FIG. 6, there is an outboard motor 6 that is mounted on the outside of the stern of the hull 2 and has an output of about 5 to 99 horsepower.

In addition, as a prior art related to an inboard engine type propulsion device, Japanese Patent Application Laid-Open No. 189693/1983 discloses
A marine propulsion system is disclosed in which the output shaft of the engine and the propeller shaft are connected via two bevel gears, thereby allowing the engine to be mounted horizontally and at a low position, thereby improving space efficiency.

(Problems to be Solved by the Invention) However, the above conventional propulsion auxiliary equipment has the following problems.

In the inboard engine type shown in FIG. 5, the diesel engine has large external dimensions and is heavy, so it takes up space and increases the weight of the boat. Furthermore, diesel engines are expensive and costly. Also, propeller 4
Also, since the propeller shaft 5 is always underwater, there is a problem in that it creates resistance during sailing.

Since the outboard motor 6 shown in FIG. 6 is mounted on the outside of the stern, there are problems in that it has poor operability and also spoils the appearance of the yacht.

In addition to the above, in both cases shown in Figures 5 and 6, when a propulsion auxiliary machine is also used during sailing (during mechanical running),
There is a problem in that since the load on the engine changes greatly depending on the wind force, it is necessary to sequentially adjust the throttle opening, propeller pitch, etc. to prevent the engine from overspeeding.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an inboard type yacht propulsion auxiliary machine that has low underwater resistance, is excellent in space efficiency, and is low in cost.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the yacht propulsion auxiliary machine of the present invention has water intake ports provided on both sides of the ballast keel, and opens and closes the water supply ports, respectively. slide valve;
It is characterized by comprising a jet unit provided inside the hull and driven by a gasoline engine that jets water sucked in from the water intake port rearward.

(Function) With this configuration, the propeller and propeller shaft do not protrude from the hull, so underwater resistance during sailing is reduced, and the engine load does not change due to wind force during mechanical sailing. In addition, by opening and closing the slide valve to absorb water from the water intake port on one side, it is possible to control the inclination of the hull using suction force. In addition, by using a gasoline engine with small external dimensions and weight, the installation space is small (and lightweight).

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a yacht to which the propulsion auxiliary equipment according to the invention is applied. In FIG. 1, water intake ports 10 (second
As shown in the figure, a water intake port 10a is opened on the starboard side and a water intake port tab is opened on the port side, and a waterway 12 is provided that communicates from the water intake port 10 through the inside of the hull 8 with an injection port 11 that opens at the stern. It is being Jet unit 1 inside hull 8
3 is provided, and the jet unit 13 is connected to the water channel 1.
The engine 15 rotates the impeller 16 of the jet unit main body to absorb water from the water intake port 1O, and the water is Propulsive force is generated by ejecting from the injection port 11.

As shown in FIG. 2, the ballast keel 9 has a water intake port 1 (
Slide valve 17 that can open and close la and 10b, respectively
a and 17b are provided. slide valve 17a,
17b is provided with a member having low underwater resistance and flush with the surface of the ballast keel 9 when closed.

In Figure 1, 18 is the cabin, 19 is the mast, 2° is the rudder, and 21 is the waterline.

The operation of this embodiment configured as above will be explained next.

When flying, the slide valves 17aE and 17b are opened, and the engine 15 rotates the impeller 16 to absorb water from the water intake port 1O, and the water is sent to the injection port 11.
Propulsion is generated by ejecting water from the

When sailing, the slide valves 17a and 17b are closed to be flush with the ballast keel 9, thereby preventing the occurrence of underwater resistance. Further, since the propeller and propeller shaft do not protrude into the water from the hull 8, underwater resistance can be reduced.

When running mechanically, open the slide valve 17a1 or 17b on the leeward side, and open the slide valve 17b (or 17b) on the windward side.
7a) and operate the jet unit 13, the suction force of the water intake port 10a (or 10bl) on the lee side is applied to the moment generated by the wind force that tends to tilt the hull, as shown in Fig. 3. Since it can act as a restoring force, the inclination of the hull 8 can be controlled.Furthermore, since the impeller 16 that generates the propulsive force is provided inside the hull 8, the sailing speed of the yacht 7 can be changed by the wind force. However, the load on the engine 15 does not change even when the wind power changes, and overspeeding of the engine due to changes in wind power does not occur, so the engine 15 can be easily operated.

The bilge can be discharged by guiding the dynamic pressure generated by the operation of the jet unit 13 to the bottom of the ship.

In addition, as shown in the lower part of FIG. 4, by providing the injection port 11 at a location where turbulent flow is likely to occur around the hull as it moves below the waterline 21 (underwater), water from the injection port 11 can be removed. The injection eliminates separation of the water flow around the hull and reduces running resistance. In the figure, arrows indicate water flow, the upper side of the figure shows the case where there is no injection port, and the lower side shows the case where the injection port is provided.

Furthermore, since it uses a small, lightweight, and inexpensive two-stroke gasoline engine, the installation space is small, the hull can be made lightweight, and manufacturing costs are low.

In this embodiment, a small, lightweight, and inexpensive two-stroke gasoline engine is used, but a four-cycle gasoline engine can also be used. In addition, injection port 1
1 is above or below the waterline 21 of the hull 8;
It may be provided on either side, and propulsive force can be generated in either case.

(Effects of the Invention) The yacht propulsion auxiliary machine of the present invention is configured as described in detail above, so that the propeller and propeller shaft do not protrude from the hull, so that underwater resistance during sailing can be reduced. Furthermore, during mechanical running, the engine load does not change due to wind force, making it easy to operate the engine. In addition, by opening and closing the slide valve to suck water from the water intake port on one side, the inclination of the hull can be controlled by the suction force, which has the excellent effect of increasing the restoring force of the hull.

Furthermore, since it uses a small, lightweight, and inexpensive gasoline engine, the installation space is small, the hull can be made lightweight, and manufacturing costs are low.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway view of a yacht to which an embodiment of the present invention is applied, FIG. 2 is a cross-sectional view taken along the line ■-n in FIG. 1, and FIG. Figure 4 is an explanatory diagram showing the water flow around the hull. Figure 5 is a perspective view of a conventional yacht. Figure 6 is a diagram showing the wind force acting on the hull and the suction force of the water intake. Figure 6 is a perspective view of a conventional yacht. FIG. 7... Yacht 8... Hull 9... Ballast keel 10a, 10b - Water intake 13... Jet unit 15... Engine diameter 1 Figure 7 Yacht 8 Hull 9 - Ballast keel toa, 10b Water intake Mouth 13 Jet unit 15 Engine Fig. 2 Fig. 4 Fig. 5

Claims (1)

[Claims] (1) The ballast keel is driven by a water intake port provided on each side of the keel, a slide valve that opens and closes the water supply port, and a gasoline engine provided inside the hull that spouts water sucked in from the water intake ports rearward. A propulsion auxiliary machine for a yacht, characterized in that it is equipped with a jet unit.