JPH0740890A - Turning assisting device for water injection propelling boat - Google Patents

Abstract

PURPOSE:To make possible turning speedily in a small turning radius when the hull is turned by water injection. CONSTITUTION:A nozzle 22 opening rearward from the stern 5 of the hull 3 is pivoted on the hull 3 side so as to be rotatable freely left and right. Pressurized water created by a water injection unit 10 is injected to the rearward of the hull 3 through the nozzle 22. A bottom plate, side plates and a rear plate are installed in the stern 5 so as to introduce injection water 31 from this nozzle 22 upward when the nozzle 22 is rotated left and right.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet propulsion boat in which pressurized water is jetted to the rear of the hull to advance the hull, and the hull can be turned by turning the nozzle left and right. The present invention relates to a turning assist device.

[0002]

2. Description of the Related Art A conventional water jet propulsion boat has been disclosed in Japanese Patent Laid-Open No. 3-2.
There is one disclosed in Japanese Patent No. 95791.

According to this, a nozzle that opens rearward from the stern of the hull is pivotally supported on the hull side of the same so as to be rotatable left and right. Then, the pressurized water generated by the water injection unit is jetted toward the rear of the hull through the nozzle.

If the jet water is jetted right behind the hull through the nozzle, the hull advances linearly, while the nozzle is rotated left or right to change the jet direction of the jet water. When it is changed to the left rear or the right rear, the reaction force of this injection causes the hull to turn left or right while moving forward.

[0005]

By the way, recently, the hull tends to be large in size, and its inertial force is increasing. Therefore, if the water jet in the above-described conventional configuration is used to turn the hull, the hull moves forward in a skid-like manner, and quick turning with a small turning radius is not possible.

[0006]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned circumstances, and when the hull is turned by water injection, the turning is performed with a small turning radius.
The purpose is to be able to do it quickly.

[0007]

In order to achieve the above object, the present invention is characterized in that a nozzle opening rearward from the stern of a hull is pivotally supported on the hull side so as to be rotatable left and right. In a water jet propulsion boat in which pressurized water generated in a water jet unit is jetted toward the rear of the hull through the nozzle, when the nozzle is rotated left and right, the jet water from the nozzle is guided upward. The guide is attached to the stern.

Further, instead of providing the guide in the above structure, a stopper may be attached to the stern for colliding jet water from the nozzle and suppressing the jet water from going backward.

[0009]

[Operation] The operation of the above configuration is as follows.

The terms in parentheses below correspond to the terms in the claims.

A bottom plate (guide) 34, a side plate (guide) 35, which guides the jet water 31 from the nozzle 22 upward when the nozzle 22 pivotally supported on the hull 3 side is pivoted left and right, A rear plate (guide) 36 is attached to the stern 5.

Therefore, during the forward movement of the hull 3, the hull 3
When the nozzle 22 is turned to the left or right in an attempt to turn the hull 3, the hull 3 starts to turn due to the reaction force of the jet of the jet water 31 from the nozzle 22. On the other hand, the jet water 31 is guided upward by the bottom plate (guide) 34 and the like, and its reaction force pushes down one of the left and right sides of the stern 5 corresponding to the direction in which the nozzle 22 is rotated. That is, one side of the hull 3 in the turning direction is tilted downward.

At this time, the bow 4 of the hull 3 is pushed upward by the buoyancy force applied to the hull 3 from the water surface 2. Therefore, the resistance force that the hull 3 receives from the water surface 2 increases, and this resists the forward inertial force of the hull 3,
The forward movement of the hull 3 is suppressed.

Further, the bottom plate (guide) 3 having the above-mentioned structure
4 or the like, instead of, or together with, the jet water 31 from the nozzle 22 is made to collide, and the jet water 31
A side plate (stopper) 35 and a rear plate (stopper) 36 that suppress the rearward movement of the ship may be attached to the stern 5.

With this arrangement, when the nozzle 22 is turned to the left or right in an attempt to turn the hull 3 while the hull 3 is moving forward, the sprayed water 31 from the nozzle 22 is directed rearward. That is, the side plate (stopper) 35 and the rear plate (stopper) 36 suppress the forward movement of one side of the stern 5 corresponding to the turning direction, and the hull is centered on the one side of the stern 5. 3 will be turned.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 is a water jet propulsion boat, which is floated on a water surface 2. The arrow Fr in the figure indicates the front of the propulsion boat 1. The left and right described below means the direction toward the front.

The hull 3 of the propulsion boat 1 is made of resin, and the bow 4 side and the stern 5 side inside the hull 3 are airtightly partitioned by a partition wall 6. An engine 8 and a fuel tank 9 are housed inside the bow 4 side. On the other hand, the stern 5 above
The water injection unit 10 is housed inside the side.

The water injection unit 10 has a water flow duct 11 extending in the front-rear direction, and this water flow duct 11 is the hull 3 described above.
It is provided almost at the center in the left-right width direction. The front end of the water flow duct 11 is connected to the bottom plate of the hull 3, and the front end opening of the water flow duct 11 is open toward the water.
It is said that. Same as above, the rear end side of the water flow duct 11 extends rearward and substantially horizontally, and is supported by a top plate 14 of the hull 3 by a bracket 13. The rear end opening of the water flow duct 11 serves as a water injection port 15. A first opening 17 is formed in the rear wall 16 of the stern 5 so as to correspond to the water injection port 15.

A front end of a propulsion shaft 19 is connected to an output shaft 18 which is a crank shaft end of the engine 8. The rear end of the propulsion shaft 19 has the partition wall 6 and the water flow duct 11
A propeller 20 is attached to the rear end of the propulsion shaft 19 and is located in the rear portion of the water flow duct 11 by sequentially penetrating the middle portion of the water flow duct 11.

Reference numeral 22 denotes a nozzle. The front end of the nozzle 22 is externally fitted to the rear end of the water flow duct 11, and the rear end thereof is the hull 3
It opens from the stern 5 to the rear. The nozzle 2
Reference numeral 2 is pivotally supported by a pivot shaft 23 at the rear end of the same water flow duct 11 on the side of the hull 3 so as to be rotatable left and right.

A steering shaft 25 is rotatably supported on the upper surface on the side of the bow 4 so as to be rotatable around its axis, and a bar handle 26 is attached to a protruding end of the steering shaft 25. The nozzle 22 is interlockingly connected to the base end of the steering shaft 25 via a link mechanism 27, and when the handle 26 is steered to the right (or left), the nozzle 22 is moved via the link mechanism 27.
The rear end side of the rear pivots to the right (or left).

A seat 29 is provided at the left and right center of the upper surface of the stern 5 side, and a rider 30 straddling the seat 29 can hold the handle 26 to operate the propulsion boat 1. .

When the power of the engine 8 is applied to the propulsion shaft 19, the propeller 20 rotates together with the propulsion shaft 19, and the water below the hull 3 is sucked into the water flow duct 11 through the water intake port 12. Is ejected from the water ejection port 15 of the water flow duct 11. In this way, the pressurized water generated in the water jet unit 10 is jetted toward the rear of the hull 3 through the nozzle 22 and the first opening 17, and the hull 3 moves forward by the reaction force of the jet of the jet water 31. It is supposed to do.

In the above case, if the handle 26 is operated so as to point straight ahead of the hull 3, the nozzle 22 will open straight rearward, and the jet water 31 will be jetted through this nozzle 22. The hull 3 advances linearly.

On the other hand, when the handle 26 is steered to the right (or to the left) as indicated by the phantom line in each figure, the rear end of the nozzle 22 is moved to the right (or left) via the link mechanism 27. Direction), the jet direction of the jet water 31 changes to the right rear (or left rear), and the reaction force of this jet causes
The hull 3 turns to the right (or left) while moving forward.

In the above structure, the turning assist device 33 is provided for swiftly turning the hull 3 with a small turning radius.

The turning assist device 33 is provided with the first opening 17
The substantially horizontal bottom plate 34 extending left and right along the lower edge of the bottom plate 34, side plates 35, 35 extending upward from the left and right side edges of the bottom plate 34, and the left and right side portions of the rear edge of the bottom plate 34, respectively. The rear plate 36, 36 extending upward is provided. Each of the side plates 35 is inclined toward the center of the hull 3 as it goes rearward in a plan view, and is inclined toward the outer side of the hull 3 as it goes upward. Also, each rear plate 3
6 is inclined rearward as it faces the outer side of the hull 3 in a plan view, and is inclined rearward as it faces upward. Further, a second opening 37 is provided between the left and right rear plates 36, 36.
Has become.

The turning assist device 33 is detachably attached to the stern 5 as follows. That is, the bottom plate 34
A pair of left and right front brackets 39 project from the front edges of the left and right side plates 35.
0 is projected. And each of the front brackets 3
9 and the side bracket 40 to the rear wall 16 of the stern 5,
Each of them is detachably screwed with a bolt 41. Supporting pieces 42 project forward from the front surfaces of the upper and lower intermediate portions of the rear plates 36, respectively.
2 is detachably screwed to the rear wall 16 by a support arm 43 and a bolt 44.

As described above, when the jet water 31 is jetted straight rearward, the jet water 31 passes through the second opening 37 and is jetted straight rearward of the hull 3, The hull 3 advances linearly.

On the other hand, during the forward movement of the hull 3, in order to turn the hull 3, as shown by the phantom line in each figure, the nozzle 2
When the rear end side of 2 is rotated rightward (or leftward), a part of the jetted water 31 jetted from the nozzle 22 collides with the side plate 35 and the rear plate 36 of the turning assist device 33. , Are guided upward along these inclination directions. That is, the side plate 35 and the rear plate 36 form a guide for guiding the jet water 31 upward. In addition, the bottom plate 34 is also the above-mentioned water 3
The bottom plate 34 also constitutes the guide because the jet water 31 is prevented from flowing downward and the jet water 31 is directed upward.

As described above, when the jet water 31 is guided upward, the reaction force at this time causes the right side (or left side) of the stern 5 corresponding to the right side (or left side) of rotating the nozzle 22. Alternatively, the left side) is pushed down, that is, the right side (or left side) of the right (or left) hull 3 that is about to turn is tilted downward. Therefore, the sideslip of the hull 3 is prevented, and the turning is promoted.

At this time, the bow 4 of the hull 3 is pushed upward by the buoyant force applied to the hull 3 from the water surface 2. Therefore, the resistance force that the hull 3 receives from the water surface 2 increases, and this resists the forward inertial force of the hull 3,
The forward movement of the hull 3 is effectively suppressed. Therefore, the sideslip of the hull 3 is prevented, and the turning is swiftly performed with a small turning radius.

When the nozzle 22 is rotated up to the maximum rotatable angle, as shown by the phantom line in FIG. 3, the axis 46 of the nozzle 22 has a rear plate 36 near the left and right center of the hull 3. It almost passes through the edge.

Further, as described above, the rear plate 36 is inclined rearward as it faces the outer side of the hull 3 in a plan view,
The jetted water 31 is guided to this, and the jetted water 31 is guided to the right (or left) more than when the nozzle 22 is rotated to the right (or left). Therefore, due to this reaction force, the hull 3 is swung to the right (or left) more quickly.

Further, as described above, when the rear end side of the nozzle 22 is rotated rightward (or leftward), the jet water 31 jetted from the nozzle 22 collides with the side plate 35 and the rear plate 36. At times, the jet water 31 is suppressed from going backward. That is, the side plate 35 and the rear plate 36
And a stopper that prevents the jet water 31 from going backward.

As described above, the jet water 31 is restrained from going backward, that is, the rightward (or leftward) forward movement of the stern 5 corresponding to the rightward (or leftward) attempting to turn is restrained. The hull 3 is turned around the right side (or left side) of the stern 5. Therefore, the sideslip of the hull 3 is prevented, and the turning is swiftly performed with a small turning radius.

Although the above is based on the illustrated example, the rear wall 16
The support piece 42 and the support arm 43 may be omitted if there is no problem in the support strength of the turning assist device 33 with respect to the. Further, the bottom plate 34 may be omitted. Further, the side plate 35 and the rear plate 3
At least one of 6 may be substantially vertical, and only the rear plate 36 may be provided.

Further, as shown by the phantom line in FIG.
You may make the rear part of 9 extend toward the upper part of the turning assistance device 33.

[0040]

According to the present invention, when the nozzle pivotally supported to the right and left on the hull side is rotated left and right, a guide for guiding the jet water from the nozzle upward is attached to the stern. .

For this reason, when the nozzle is turned to the left or right in an attempt to turn the hull while the hull is moving forward, the hull starts to turn due to the reaction force of the jet of jet water from the nozzle. On the other hand, the jet water is guided upward by the guide, and its reaction force pushes down one of the left and right sides of the stern corresponding to the direction in which the nozzle is rotated. That is, one side of the hull in the direction of turning is tilted downward.

Therefore, the sideslip of the hull is prevented, the turning is promoted, and the turning is quickly performed with a small turning radius.

At this time, the bow of the hull is pushed upward by the buoyancy force applied to the hull from the water surface.
Therefore, the resistance force that the hull receives from the water surface becomes large, which opposes the forward inertial force of the hull, and the forward movement of the hull is suppressed. That is, also in this respect, the sideslip of the hull is prevented, and the turning is quickly performed with a small turning radius.

Further, instead of providing the guide in the above structure, or together with the guide, a stopper may be attached to the stern to prevent the jet water from colliding with the jet water and to prevent the jet water from going backward.

With this arrangement, when the nozzle is rotated left or right in an attempt to turn the hull while the hull is moving forward, the stopper prevents the jet water from the nozzle from going backward. That is, the forward movement of the one side of the stern corresponding to the turning direction is suppressed, and the hull is turned around the one side of the stern. Therefore, the sideslip of the hull can be prevented more reliably, and the turning can be swiftly performed with a smaller turning radius.

[Brief description of drawings]

FIG. 1 is an overall side surface partial cross-sectional view.

FIG. 2 is an overall plan sectional view.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a rear view of what is shown in FIG.

5 is a cross-sectional view taken along the line 5-5 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion boat 2 Water surface 3 Hull 4 Bow 5 Stern 6 Partition wall 10 Water injection unit 22 Nozzle 31 Jet water 33 Swivel assist device 34 Bottom plate (guide) 35 Side plate (guide, stopper) 36 Rear plate (guide, stopper)

Claims (2)

[Claims] 1. A nozzle that opens rearward from the stern of the hull is pivotally supported on the hull side so as to be rotatable left and right, and pressurized water generated in a water injection unit is jetted toward the rear of the hull through the nozzle. In the water jet propulsion watercraft thus constructed, a turning assist device for the water jet propulsion watercraft, wherein a guide for guiding the water jetted from the nozzle upward when the nozzle is rotated left and right is attached to the stern. 2. A nozzle that opens rearward from the stern of the hull is pivotally supported on the hull side so as to be rotatable left and right, and the pressurized water generated by the water injection unit is jetted toward the rear of the hull through the nozzle. In the water jet propulsion watercraft configured as described above, when the nozzle is rotated to the left or right, the water attached to the stern of the stern has a stopper that causes the jet water from the nozzle to collide with the jet water and prevent the jet water from going backward. Turning assist device for jet propulsion boat.