JP2003072679A - Water jet propelled craft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide more sense of speed and enjoyment of advanced cornering technique or the like. SOLUTION: By attaching a planing board 34 on a lower part of a hull 4 of the water jet propelled craft, and coupling an output shaft 29 of an engine 6 mounted on the hull 4 and an impeller shaft 43 of a jet propeller 40 mounted on the planing board 34 by gearboxes 46A and 46B, the planing board 34 planes on a water surface during planing and the hull 4 is largely lifted from the water surface.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water jet propulsion watercraft.

[0002]

2. Description of the Related Art A water jet propulsion watercraft propels by ejecting a jet flow generated by a jet propulsion machine driven by an engine from an injection nozzle.

Such a water jet propulsion boat mainly enjoys a feeling of speed and cornering technique.

[0004]

In the water jet propulsion watercraft as described above, there is a demand for a type of water jet propulsion watercraft that is more speedy and that allows users to enjoy advanced cornering techniques and the like.

The present invention has been made in order to meet the above demands, and an object of the present invention is to provide a water jet propulsion watercraft which is more speedy and which allows users to enjoy advanced cornering techniques and the like.

[0006]

In order to solve the above problems, the present invention provides a water jet propulsion watercraft for propelling a jet flow generated by a jet propulsion machine driven by an engine by injecting the jet flow from an injection nozzle. A water jet propulsion boat has a gliding board attached below the hull, an engine is mounted on the hull, and a jet propulsion machine is mounted on the gliding board, and a drive system for the engine and a drive system for the jet propulsion boat. The present invention provides a water jet propulsion watercraft characterized by being connected by a gear box.

According to the present invention, the sliding board is attached to the lower part of the hull of the water jet propulsion boat, and the drive system of the engine mounted on the hull and the drive system of the jet propulsion device mounted on the sliding board are arranged in the gear box. By connecting them, the sliding board slides on the water surface and the hull floats above the water surface during sliding, which makes the hull full of speed compared to the type in which the hull slides on the water surface. In addition, the sliding board allows you to turn at a deep bank angle, so you can enjoy advanced cornering techniques. Further, when the speed is reduced, the sliding board becomes submerged in the water due to the weight of the hull, so that the braking effect at the time of stopping becomes large and the hull stopping stability also improves. Furthermore, since the planing board has the same function as the ballast keel of a yacht, even if it is overturned, restoration can be easily performed.

If the sliding board is attached to the lower part of the hull via a stay as in the second aspect of the invention, the distance between the hull and the sliding board can be set wide, so that the position of the line of sight of the operator is As it gets higher and more speedy,
You will be able to turn at a deeper bank angle.

When the gear box is substantially L-shaped as in claim 3, the distance between the hull and the sliding board can be set wider together with the stay, and the drive system of the engine and the jet propulsion machine can be set. Can be reasonably connected to the drive system of.

According to a fourth aspect of the present invention, the sliding board is composed of a hollow body, and if the sliding board is provided with water / air supply / discharge holes for the hollow portion of the hollow body, when the speed is reduced, Air comes to be discharged while water enters from the water / air supply / discharge holes (water ballast),
Since the planing board sinks into the water quickly, the braking effect at the time of stopping becomes greater and the hull stopping stability also improves. In addition, when the skiing starts, the water will be discharged while the air enters through the water / air supply / discharge holes, and the sliding board will float above the water quickly, improving the sliding stability of the hull. Come to do.

When the chine protruding laterally is formed on both side surfaces of the sliding board, the stability of sliding and turning can be further improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of the water jet propulsion boat, FIG. 2 is a plan view of the water jet propulsion boat, FIG. 3 is a sectional view taken along the line AA of FIG. 1, and FIG. 4 is a perspective view of the water jet propulsion boat. 5 is a schematic side view of a water jet propulsion boat, and FIG. 6 is a planing board,
7A is a plan view, FIG. 7B is a side view, FIG. 7 is a planing board, FIG. 7A is a rear view, and FIG. 6B is a sectional view taken along line BB in FIG. 6B.

As shown in FIGS. 1 to 4, a water jet propulsion boat 1 includes a hull member 4 in which a hull member 2 having a substantially V-shaped cross section and a deck member 3 attached to the upper portion thereof are joined and integrated. And an engine room 5 is formed in a space inside the hull 4, and a substantially central portion of the engine room 5 in the front-rear direction is
The engine 6 is mounted so that the crankshaft extends in the longitudinal direction of the hull, and the fuel tank 7 and the oil tank 10 are arranged in front of the engine 6, and the fuel supply pipe 7a of the fuel tank 7 is a deck member. 3 extends to the starboard side and is closed by an oil supply cap 8 on the outer surface side of the deck member 3. A battery 15 is arranged behind the engine 6.

The engine room 5 is provided with a front ventilator 13 and a rear ventilator 14 for ventilating the inside of the engine room 5.

A bow cover 1 is provided on the front portion of the deck member 3.
2 is attached, and an article storage box 9 having an open upper surface is formed at the front portion of the bow cover 12, and a bow hatch 11 capable of opening and closing the opening of the article storage box 9 is attached to the bow cover 12. .

Rope holes 3a are formed at the front and rear ends of the deck member 3, and the bow eye 1 is provided at the front end of the hull member 2 corresponding to the rope hole 3a at the front end.
8 is attached.

A steering handle 16 is provided above the bow cover 12 above the engine 6, and behind the steering handle 16 is formed a seat base 3c which rises upward from the deck member 3 and extends rearward. An opening 3d (see FIG. 3) for checking and maintaining the engine 6 is formed on the upper surface of the seat base 3c, and foot steps 3e are formed on both sides of the seat base 3c.

The opening 3 is formed on the upper surface of the seat base 3c.
A straddle type seat 17 capable of opening and closing d is detachably arranged. A handgrip 1 is provided on the rear surface of the seat base 3c.
9 is attached.

The exhaust pipe 28 of the engine 6 extends from the exhaust manifold on the port side of the engine 6 to the starboard side of the engine 6 through the front side, extends rearward, and extends to the port side behind the engine 6. And is connected to the water lock 29. A discharge pipe 30 is attached to the water lock 29.
The discharge pipe 30 is opened at the rear portion of the boat body 4.

A sliding board 34 is arranged below the hull 4, and the rear end of the sliding board 34 in the lengthwise direction substantially coincides with the rear end of the hull 4 in a plan view, and the front end thereof is The hull 4 is slightly longer than the front end of the hull 4 and is formed in a semi-circular shape, and the lateral width direction thereof is slightly narrower than the hull 4. Moreover, while having a predetermined thickness in a side view,
The bottom surface of the front end portion is formed to have a slightly upward slope.

The sliding board 34 includes a top plate 34a, a bottom plate 34b, both side plates 34c and a back plate 34d made of FRP.
It is configured as a hollow body by joining and.

An upper end of a front stay 33A extending slightly obliquely forward is fixed to the lower front portion of the hull 4, and the lower end of the front stay 33A has an upper surface plate 34a of the sliding board 34.
And is fixed to the bottom plate 34b in the hollow portion 34e. Further, an upper end portion of a rear stay 33B extending substantially right below is fixed to a lower rear portion of the hull 4, and a lower end portion of the rear stay 33B is fixed to an upper surface plate 34a of a sliding board 34. As a result, the sliding board 34 is attached to the lower portion of the hull 4 via the front and rear stays 33A and 33B.

On the upper surface plate 34a of the sliding board 34,
As shown in FIG. 6 (a), a number of elongated water / air supply / discharge holes 34f penetrating the hollow portion 34e are formed in three rows in the width direction and at predetermined intervals in the length direction. (See FIG. 7 (b)), the front side of the side plate 34c is shown in FIG.
As shown in (b), a plurality of round-hole-shaped water / air supply / discharge holes 34g penetrating the hollow portion 34e are formed in a row at predetermined intervals in the length direction (FIG. 7). (See (b)).
In addition, the rear plate 34d has hollow portions 34e on both sides in the width direction.
A round hole-shaped water / air supply / discharge hole 34h penetrating therethrough is formed (see FIG. 7A).

On both side plates 34c of the sliding board 34, the chine 3 which projects laterally from the vicinity of the bottom plate 34b.
5 is fixed, and this chine 35 has a substantially equal width up to about 2/3 on the rear side in the entire length of the sliding board 34, and gradually widens toward about 1/3 on the front side toward the front end side. It is designed to be along the side plates 34c while narrowing.

As shown in FIG. 5, the sliding board 34 is also provided.
A jet propulsion device 40 is mounted in the rear part of the hollow portion 34e of the water jet propulsion device 40. An impeller (not shown) rotated by an impeller shaft 43 is housed in the housing 42.

An injection nozzle 44a is provided in the rear portion of the impeller housing 42, and a deflector 44b which swings to the left or right by the steering operation of the steering handle 16 is attached to the injection nozzle 44a.

Behind the engine 6 in the hull 4 is an upper gear box 4 to which an output shaft 39 of the engine 6 is connected.
6A is arranged, and in front of the jet propulsion device 40 in the sliding board 34, a lower gearbox 46B to which an impeller shaft 43 is connected is arranged.
6A and 46B are connected by a substantially vertical drive shaft 47. A pair of bevel gears and the like are provided in the both gear boxes 46A and 46B, respectively, and the output shaft 39 of the engine 6 and the impeller shaft 43 of the jet propulsion device 40 are provided.
And are connected in a substantially L shape.

In the water jet propulsion boat 1, the engine 6
Output shaft 39 → upper gear box 46A → drive shaft 4
When the impeller of the jet propulsion device 40 is rotated by 7 → lower gear box 46B → impeller shaft 43, a jet flow generated in the jet propulsion device 40 is generated by the injection nozzle 4
It is propelled by being injected from 4a and is turned by the deflector 44b which is rocked by the steering operation of the steering handle 16.

With the jet propulsion boat 1 as described above,
A sliding board 34 is attached below the hull 4 via stays 33A and 33B, and an output shaft 39 of an engine 6 mounted on the hull 4 and a jet propulsion device 40 mounted on the sliding board 34.
By connecting the impeller shaft 43 to the gearboxes 46A and 46B with the drive shaft 47, the engine 6 of the hull 4 drives the jet propulsion unit 40 of the sliding board 34, and the hull 4 is propelled. .

Then, as shown in FIG. 5, the sliding board 34 slides on the surface of the water at the time of sliding and stays 33A, 33B.
As a result, the hull 4 floats above the water surface L2, and the position of the driver's eyes is raised, which makes the hull 4 more full of speed than the conventional type in which the hull 4 slides on the water surface L1.

At the time of turning, since the hull 4 floats above the water surface L2, a deeper bank angle θ (see FIG. 3).
You can enjoy advanced cornering techniques because you can turn with (see).

Further, when the speed is reduced, the weight of the hull 4 causes the planing board 34 to sink in the water, so that the braking effect at the time of stopping becomes great. Particularly, the sliding board 34 has water / air supply / discharge holes 34f to 3 for the hollow portion 34e.
Since 4h is formed, when the speed is reduced, air is discharged while water enters the hollow portions 34e from the water / air supply / discharge holes 34f to 34h (water ballast), and the sliding board 34 is Since it sinks quickly into the water, the braking effect at the time of stopping is further increased and the stopping stability of the hull 4 is further improved.

Furthermore, when the gliding is started again, water
The water is discharged from the air supply / discharge holes 34f to 34h into the hollow portion 34e of the sliding board 34, and the sliding board 34 quickly floats on the water. Stability will also be improved.

Further, since the sliding board 34 has the same function as that of the ballast keel of the yacht, even if the hull 4 is overturned, the restoration can be easily performed.

Further, since the output shaft of the engine 6 of the hull 4 and the impeller shaft 43 of the jet propulsion device 40 of the sliding board 34 are connected to each other by the gear boxes 46A and 46B and the drive shaft 47 in a substantially L-shape, The distance between the hull 4 and the sliding board 34 can be set wider together with the stays 33A and 33B, and the output shaft of the engine and the jet propulsion unit 40 can be set.
The impeller shaft 43 can be connected reasonably and reasonably.

Both side plates 34c of the sliding board 34
In addition, since the chine 35 that projects to the side is formed,
The stability of gliding and turning will be further improved.

In the above embodiment, the jet propulsion device 40 is mounted in the sliding board 34, but the jet propulsion device 40 is mounted as it is on the top plate 34a or the bottom plate 34b of the sliding board 34. It is also possible.

[0039]

As is apparent from the above description, according to the present invention, a sliding board is attached below the hull of a water jet propulsion boat, and a jet system mounted on the driving system of an engine mounted on the hull and the sliding board. By connecting the drive system of the propulsion unit with a gear box, the sliding board slides on the water surface during sliding and the hull floats above the water surface. Will overflow. In addition, the sliding board allows you to turn at a deep bank angle, so you can enjoy advanced cornering techniques. Further, when the speed is reduced, the sliding board becomes submerged in the water due to the weight of the hull, so that the braking effect at the time of stopping becomes large and the hull stopping stability also improves. Furthermore, since the planing board has the same function as the ballast keel of a yacht, even if it is overturned, restoration can be easily performed.

When the sliding board is attached to the lower part of the hull via the stay (claim 2), the distance between the hull and the sliding board can be set wide, so that the position of the driver's eyes becomes higher and the speed becomes higher. It is full of feeling, and you can turn at a deeper bank angle.

Further, when the gearbox is substantially L-shaped (claim 3), the distance between the hull and the sliding board can be set wider together with the stay, and the drive system of the engine and the jet propulsion machine can be set. The drive system can be connected reasonably.

Furthermore, if the sliding board is composed of a hollow body, and water / air supply / discharge holes for the hollow portion of the hollow body are formed in this sliding board (claim 4), the speed of the water / air is reduced. Air will be discharged while water enters through the water supply / discharge holes (water ballast), and the sliding board will sink quickly into the water, resulting in a greater braking effect when stopped and stability of hull stopping. Will be even better. In addition, when the skiing starts, the water will be discharged while the air enters through the water / air supply / discharge holes, and the sliding board will float above the water quickly, improving the sliding stability of the hull. Come to do.

Further, by forming the side projections on both sides of the sliding board (claim 5), the stability of sliding and turning can be further improved.

[Brief description of drawings]

FIG. 1 is a side view of a water jet propulsion boat.

FIG. 2 is a plan view of a water jet propulsion boat.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of a water jet propulsion boat.

FIG. 5 is a schematic side view of the water jet propulsion boat.

6 is a planing board, (a) is a plan view, (b)
Is a side view.

FIG. 7 is a planing board, (a) is a rear view, and (b) is a plan view.
FIG. 6B is a sectional view taken along line BB in FIG.

[Explanation of symbols] 1 water jet propulsion boat 4 hull 6 engine 33A, 33B stay 34 sliding board 34e hollow part 34f-34h Water / air supply / discharge holes 35 chine 39 Output shaft (drive system) 40 jet propulsion machine 43 Impeller shaft (drive system) 46A, 46B gearbox 47 drive shaft

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shin Shibayama             Yamaha Motor, 2500 Shinkai, Iwata, Shizuoka Prefecture             Within the corporation

Claims (5)

[Claims] 1. A water jet propulsion watercraft for propelling a jet flow generated by a jet propulsion machine driven by an engine from an injection nozzle, wherein a sliding board is attached below a hull of the water jet propulsion watercraft. A water jet propulsion characterized in that an engine is mounted on a hull, a jet propulsion machine is mounted on the sliding board, and a drive system of the engine and a drive system of the jet propulsion boat are connected by a gear box. Boat. 2. The water jet propulsion watercraft according to claim 1, wherein the sliding board is attached to a lower portion of the hull via a stay. 3. The water jet propulsion boat according to claim 1, wherein the gear box is substantially L-shaped. 4. The water according to claim 1, wherein the sliding board is composed of a hollow body, and water / air supply / discharge holes for the hollow portion of the hollow body are formed in the sliding board. Jet propulsion boat. 5. The water jet propulsion watercraft according to claim 1, wherein sideways of the planing board are formed on both side surfaces of the planing board.