JPH02179593A - Small-sized jet propulsion vessel - Google Patents

Abstract

PURPOSE:To improve the drivability and improve stability by arranging the equipment such as an engine and a jet propulsion machine in nearly straight line form in the vicinity of the center line in the width direction of a hull and enclosing said equipment by a hull and a deck and obtaining a structure free from the projection which spreads in the width direction on the both sides of a seat on the deck, in the water jet, etc. CONSTITUTION:The second muffler 4, fuel tank 5, engine 6, the first muffler 7 on the side of the engine 6, jet propulsion machine 8 and a battery 9 over the propulsion machine 8 are arranged in the nearly straight line form, from the bow side in the vicinity of the center line in a hull 1, and enclosed by a hull 2 and a deck 3. Therefore, the existence of the projecting article which spreads in the width direction on the both sides of a seat 17 from the deck 3 is eliminated. With such constitution, the center of gravity is positioned on the bow side on the center line of the hull, and the stable traveling is performed, and the drivability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) This invention relates to a small jet propulsion boat such as a water jet.

(Prior Art) Water leisure has recently been in the spotlight, and various types of water play equipment such as water skis, jet skis, and wet bikes have been provided. Water jets, which are particularly popular as a sport among young people, are disclosed in Japanese Patent Laid-Open No. 125987/1987 and Japanese Patent Publication No. 3879/1983.

(Problem to be solved by the invention) By the way, the boat disclosed in the former publication has a wide hull and has good stability, but on the other hand, it is not possible to make sharp turns in a small radius, it is not possible to perform sports techniques such as jumping, and it has a poor sportiness. It has the disadvantage of not being able to demonstrate its full potential. The one published on the rear right does not have the above drawbacks, but it is difficult to maintain balance on the hull, and the boat clings to the stern of the boat from underwater until planing, and quickly when it reaches a certain speed. It is necessary to transfer to a boat, and while the boat is planing until transferring to the boat, the front of the boat rises upwards, cutting off the front view, making it impossible to see what is ahead, creating a visual blind spot, and causing danger. There are drawbacks.

This invention has a narrow hull, which makes it easier to handle sharp turns and jumps, provides high stability when planing, and allows you to start while straddling the seat of the hull, improving safety. The object of the present invention is to provide a small jet propulsion boat that can be improved.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the problems of the above-mentioned prior art, this invention provides the following:
Fuel tanks, engines, batteries, jet propulsion equipment, and other equipment are arranged in a straight line near the center line in the width direction inside the hull, and these equipment are wrapped around the hull and deck so that they are placed on both sides of the seats on the deck. It is characterized by having a structure with no protruding parts extending in the width direction, and in which the engine is started by sitting astride the hull.

(Function) Since the equipment is arranged in a straight line near the center line in the width direction of the hull, the center of gravity in the left and right direction is stable, and it is stable even when straddling the seat and starting the engine and planing. . In addition, since there is nothing protruding in the lateral direction of the hull, stability is good when straddling the hull, forward visibility is not obstructed when starting, and the width of the hull is narrow, allowing for quick turns, jumps, etc. You can ride it in different ways.

(Example) Hereinafter, an example of a small jet propulsion boat according to the present invention will be described with reference to the drawings.

As shown in Figures 1 and 2, a small jet propulsion boat has a hull 1 consisting of a hull 2 and a deck 3, and the hull 2 and deck 3 are integrated with their widths being approximately equal. The width of the hull 1 is preferably 800#I#1 or less, for example.

As shown in Fig. 1, inside the hull 1, from the bow side, there is a 27th flap 4, a fuel tank 5, an engine 6, a 17th flap 7 next to it, a jet propulsion machine 8, and a battery 9 above it. All of them are arranged substantially in a straight line along the center line in the width direction of the hull 1 (indicated by 10 in FIG. 2). A nozzle 11 of the jet propulsion device 8 is provided to open at the stern of the boat, and is steered as shown by the arrow in FIG. 2 by operating a handle 12a of a steering device 12.

The jet propulsion device 8 is of a known type and has an impeller (not shown) therein, and a shaft 13 of the impeller is connected to an output shaft 14 of the engine 6 through a coupling 15 and supported by a bearing 16 . The rotation of the engine 6 causes the impeller to rotate, sucking water from the bottom of the ship, and converting it to high pressure into the nozzle 1.
The hull 1 is propelled by the reaction force of the jet stream ejected from the boat 1.

Therefore, the center of gravity of the hull 1 is at the center line 1 in the width direction of the hull 1.
Since equipment with a large weight M is placed on the bow side, the weight on the stern side is lightened, and if you ride astride the seat 17 as shown in the third figure, you will be able to plan stably. can. When the rider leans his/her body as shown in Figure 4, since the width of the boat is narrow, the movement of the boat body 1 due to the rider's weight shift is large, allowing the rider to make a quick sharp turn or turn back. At this time, the hull 2 does not have any protruding parts such as coamings or buoyant bodies that extend in the width direction of the hull 1, so it can make sharp sharp turns and is lightweight and compact, which improves vertical motion performance such as jumping. Furthermore, it becomes easier to transport the hull 1 on land.

To start a jet propulsion boat, go around the stern side of the hull 1 as shown in Figure 5 (A), apply a load to the rear of the hull 1, make the stern sink, and then slowly balance the boat. Board the boat while holding it, and straddle the seat 16 of the hull 1 (see Figure 5).
B)). If the engine 6 is started after the rider sits on the seat 17 of the hull 1, forward visibility is always ensured, the engine can be started without any blind spots, and if the rider enters the planing state, as shown in Figure 5 (C).
As shown in the figure, the boat body 1 is in a horizontal state, and the center of gravity of the boat body 1 itself is aligned along the width direction center line 10, so that the boat body 1 can run stably without having to take balance from side to side.

Next, a second embodiment of this small jet propulsion boat will be described.

The small jet propulsion boat shown in this embodiment differs from the small jet propulsion boat shown in FIGS. 1 and 2 in that the steering shaft 21 of the steering device 20 is movably attached to the deck 3. Fundamentally different. Since other parts are substantially the same, they will be given the same reference numerals and their explanation will be omitted. Although the steering shaft is constructed so as to be able to rotate vertically by pivoting, it may be constructed so that it can slide not only in the vertical direction but also in the longitudinal direction.

In this small jet propulsion boat, the rider climbs onto the hull 1 while maintaining balance, and then starts the engine while seated, and plans the boat in the same way as shown in Figures 1 and 2. However, in this small jet propulsion watercraft, the steering shift 21 can be raised to take a standing position when planing as shown in FIG.

By enjoying gliding in a standing position, this small jet boat functions as a pleasure boat and allows you to enjoy sports techniques such as sharp turns and jumps. In response to these intense movements, the rider's knee springs
It can absorb and soften the shock that is applied to ships.

Further, FIG. 8 shows a third embodiment of this small jet propulsion boat.

The small jet propulsion boat shown in this embodiment has skis 27 attached to the steering shaft 26 of the steering device 25.
It is made with . That is, this small jet propulsion boat has skis 27 added to the front lower part of the boat body 1.

A steering shaft 26 of the steering device 25 is inserted through a handle support portion 28 of the deck 3 and supported via a holder 29 fixed within the hull 1. The lower end of the steering shaft 26 passes through the hull 2, and a support fitting 30 is fixed to the lower end, and a ski 27 is fixed to the support fitting 30 by a fastener such as a screw 31. The upper end of the steering stain shift 26 protrudes from the upper part of the handle support part 28 and is sealed by an oil seal 33. The center portion of the bar handle 12a is fixed to a mounting seat 34 integral with the upper end of the steering shaft 26 by a holding plate 35, 36.
By rotating a, the ski 27 is steered left and right.

Therefore, in this case, the nozzle 35 of the jet propulsion device 8
The nozzle 11 is generally a fixed type, but there is also a movable nozzle 11.
The nozzle 11 may also be provided to steer the boat body 1.

By attaching the skis 27 in this way, even if rotational moment is applied to the hull 1 due to transverse waves or the like during medium or high speed running, a moment in the opposite direction can be generated by changing the direction of the skis 27. The attitude of the hull 1 can be stabilized. In addition, since lift is generated only by the skis 27 and the rear part of the bottom, it is possible to travel at higher speeds than when the hull 1 is used alone.Furthermore, if a shock absorber is connected to the middle of the steering shaft 26, the impact is softened and the boat can ride at higher speeds. It can improve your comfort. Since the width of the hull 1 is narrow, the movement of the hull 1 due to the rider's weight shift is large, making it easy to ride in a sporty manner such as making sharp turns. The addition of this invention to a small jet propulsion boat has great effects, such as generating a force in the opposite direction just by changing the position, making it easy to reposition, and making it easy to restore balance.

〔Effect of the invention〕

As described above, according to the present invention, although the width of the hull is narrow, the engine and its auxiliary equipment are arranged in a straight line along the center line in the width direction of the hull, resulting in excellent center of gravity stability. In addition to the fact that there is nothing protruding in the width direction, the engine can be started while straddling the hull, there is no need to transfer from the stern after starting, and the forward view is not obstructed, which is dangerous. There is no safety ^^
You can Since the width of the hull is narrow, it is easy to ride in water sports such as sharp turns and jumps, and the hull is also easy to handle on land.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a small jet propulsion boat according to the present invention, and FIG. 2 is a plan view of the small jet propulsion boat.
Figure 3 is a rear view showing the state of the small jet propulsion boat when it is traveling straight, Figure 4 is a rear view showing the state of the small jet propulsion boat when it is turning, and Figures 5 (A) to (C) are from start to run. FIG. 6 is a perspective view showing the second embodiment of the present invention, FIG. 7 is a diagram showing an example of the small jet propulsion boat shown in FIG. 6 when it is planing, and FIG. FIG. 9 is an exploded perspective view of the steering device portion of the small jet propulsion watercraft shown in FIG. 8. FIG.

Claims (1)

[Claims] The fuel tank, engine, battery, jet propulsion machine, and other equipment are arranged in a nearly straight line near the center line in the width direction inside the hull, and these equipment are wrapped by the hull and deck, so that the seats on the deck are A small jet propulsion boat characterized by having a structure without any protruding parts extending in the width direction on both sides, and in which the engine is started by sitting astride the hull.