JP2003182689A - Water jet propelling boat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve rudder control and turning performance in advancing with inertia even when an engine is stopped or in the idling state. <P>SOLUTION: In advancing with inertia when the engine 15 is stopped or in the idling state, if the rudder handle 13 is operated, for example, to the right, a left flap 30L is oscillated downward D by driving mechanisms 27, 29 and 32 and projected into the water, a lift force is generated, the portside of a boat body 10 is lifted, and the boat body 10 is turned to the right, while in high-speed navigation of the boat body 10, the flap 30L keeps upward oscillation by water pressure due to a contracting action of a telescopic member 33. <P>COPYRIGHT: (C)2003,JPO

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 advances by injecting a jet flow generated by a jet propulsion machine having an impeller driven by an engine rearward from an injection nozzle, and straddles a straddle type seat. The operator operates the steering wheel to swing the deflector to the left or right to steer the vehicle (US Pat. No. 6,174,210).
JP, JP 2001-191992, and JP 20
00-280986).

[0003]

In the water jet propulsion watercraft as described above, even when the engine is stopped or idling, it is possible to turn by operating the steering handle when the engine is coasting forward. Is required.

The present invention has been made in order to satisfy the above-mentioned demands. Even when the engine is stopped or idling, the steering control is improved and the turning performance is improved when the engine is moving forward by inertia. The purpose of the present invention is to provide a water jet propulsion boat.

[0005]

In order to achieve the above object, the present invention advances by injecting a jet flow generated by a jet propulsion machine driven by an engine rearward from an injection nozzle, and at the same time, a steering wheel In a water jet propulsion boat in which a deflector is pivoted to the left or right with a steering cable that is interlocked with operation, a flap that can always project along the hull to the left and right positions of the hull is vertically swingable. A drive mechanism is provided which is provided in the middle of the steering cable so that the flap on the side opposite to the operating direction of the steering wheel is driven to project into the water, and between the drive mechanism and each flap,
A water jet propulsion watercraft is provided with an expansion / contraction mechanism for allowing the flaps to swing upward when the water pressure exceeds a predetermined pressure.

According to the present invention, when the engine is stopped or idling and the engine is coasting forward,
For example, when the steering handle is operated to the right, the drive mechanism causes the left flap to swing downward and project into the water, which causes lift and lifts the port side of the hull so that the hull turns to the right. Therefore, the rudder control is improved and the turning performance is improved. Note that, for example, if the steering handle is operated to the left, the hull will similarly turn left.

Further, when the hull is traveling at a high speed, even if one of the left and right flaps is about to swing downward by operating the steering handle, the water pressure acting on the flap is equal to or higher than a predetermined pressure. As a result, the contraction of the elastic member causes the flap to remain oscillated upward by water pressure, effectively preventing the steering effect when unnecessary.

According to a second aspect of the present invention, the drive mechanism includes a slide plate that is moved back and forth by a steering cable,
The slide plate is composed of a swivel arm that swivels left and right in conjunction with each other through a pin and an elongated hole, and left and right cables that respectively connect the left and right flaps of the swivel arm and the left and right flaps. If the left and right coil springs are respectively provided between the left and right cables, the drive mechanism and the expansion / contraction mechanism can be configured mechanically, so that a control device such as an electronic type is not required and the cost is reduced. As a result, the reliability and durability of operation will be improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a water jet propulsion boat has a hull 10 composed of a hull member 11 and a deck member 12. A steering handlebar 13 is provided above the deck member 12, and a straddle seat 14 is provided at a rear position of the steering handlebar 13.

Steps for the operator to ride his / her feet on the straddle-type seat 14 between the seats of the deck member 12 and the bulwark projecting upward from both sides of the deck member 12 Are formed respectively.

An engine 15 is mounted in the engine chamber of the hull 10 and the jet propulsion machine 1 is installed in a pump chamber 20 formed in the lower rear portion of the hull member 11 of the hull 10.
6 is mounted and the impeller 17 is rotated by the engine 15, so that a jet flow is generated at the impeller 17 by the water sucked from the water suction port 11a at the bottom of the ship, and the jet nozzle 1
The hull 10 is propelled by injecting the jet stream from 8 backward.

By operating the steering handle 13 to swing the deflector 19 at the rear portion of the injection nozzle 18 to the left and right, the hull 10 is turned in the left-right direction (rudder control).

That is, a lever 24 protruding laterally is attached to the steering shaft 23 of the steering handle 13, and the lever 24 and the deflector 19 are connected by a steering cable 25 (A, B).
When the steering handle 13 is operated to the right, the steering cable 25 moves forward and the deflector 19 is rotated.
When the hull 10 pivots to the left around 9a and turns to the right, and the steering handle 13 is operated to the left, the steering cables 25 (A, B) move rearward and the deflector 19 moves the pivot shaft 19a. The hull 10 swings right toward the center and the hull 10 turns left.

As shown in detail in FIGS. 3 and 4, in the middle of the steering cable 25 (A, B), a longitudinal slot 27a fitted in the support shaft 26 is slidably guided in the longitudinal direction. A slide plate 27 is arranged, and a rear end portion 25 of the steering plate 13 is provided at a front end portion 27b of the slide plate 27.
The front end portion 25b of the steering cable 25 (B) on the deflector 19 side is connected to the rear end portion 27c of the slide plate 27 as well as a.

Therefore, when the steering handle 13 is operated right, the slide plate 27 is slid forward by the steering cable 25 (A, B), and when the steering handle 13 is operated left, the slide plate 25 is moved by the steering cable 25 (A, B). 27 comes to be slid back.

A side projecting portion 27d is provided on the right side of the slide plate 27, and a lateral long hole 27f is formed in the side projecting portion 27d.

A swivel arm 29 is provided above the support shaft 26.
The center portion of the rotary arm 29 is pivotally mounted to the left and right, and the right portion 29b of the pivot arm 29 is provided with a pin 29c that fits into the elongated hole 27f of the side projecting portion 27d of the slide plate 27.

Therefore, when the slide plate 27 slides forward, the turning arm 29 is turned to the left via the pin 29c fitted in the elongated hole 27f, and the slide plate 27 is turned.
When is slid backward, the revolving arm 29 is turned to the right through the pin 29c fitted in the slot 27f.

At the left and right positions of the rear bottom 10a of the hull 10, as shown in FIG.
Left and right flaps 30L, 30 that are horizontal along a
R is attached by a horizontal shaft 31, and each of the flaps 30L and 30R swings vertically from the horizontal position indicated by the solid line. Then, each flap 30L, 30R comes to project into the water from the ship bottom 10a when it is swung downward D.

An arm portion 30a is provided on each of the flaps 30L and 30R, the arm portion 30a of the left flap 30L and the left portion 29a of the turning arm 29 are connected by a left cable 32L, and the right flap 30R is provided. The arm portion 30a and the right portion 29b of the turning arm 29 are connected by the right cable 32R.

Between the above cables 32L and 32R,
Coil spring 33L. 33R
Are installed respectively. Each coil spring 3
3L and 33R keep the flaps 30L and 30R in a horizontal state along the bottom 10a of the hull 10 at all times, and when the flaps 30L and 30R try to swing downward D, the hull 10 moves at high speed. And sailing at each flap 3
When the water pressure of 0 L or 30 R is higher than a predetermined pressure, the flaps 30 L and 30 R are set to be contractible so that the flaps 30 L and 30 R can be swung upward.

If the water jet propulsion boat is constructed as described above, when the steering wheel 13 is operated to the right when the engine is currently stopped or idling and the vehicle is moving forward at a low speed, the steering cable moves forward. The slide plate 27 is slid forward by 25 (A), the steering cable 25 (B) is moved forward by this slide plate 27, and the deflector 19 is moved.
Will be swung to the left.

Here, the hull 10 is moving forward at a low speed by inertia, but since the engine is stopped or idling, there is little or no jet from the jet nozzle 18, so the deflector 19 swings to the left. Even when moved, the hull 10 does not turn right.

Therefore, when the slide plate 27 is slid forward, the swivel arm 29 is swung left through the slot 27f and the pin 29c, whereby the right cable 32R is moved forward and the right flap 30R is raised. Simultaneously with the swing U, the left cable 32L is moved rearward to move the left flap 30L.
Is oscillated downward D.

In this manner, the left flap 30L swings downward D and projects into the water, whereby lift is generated and the hull 1
Since the port side of 0 is lifted, the hull 10 turns right, so that the rudder control is improved and the turning performance is improved.

On the contrary, when the steering wheel 13 is operated to the left,
When the slide plate 27 is slid rearward by the steering cable 25 (A) moving backward and the turning arm 29 is turned rightward, the left cable 32L is moved forward and the left flap 30L is swung up U. At the same time, the right cable 32R is moved rearward so that the right flap 30R swings downward D
Will be done.

In this way, the right flap 30R swings downward D and projects into the water, whereby lift is generated and the hull 1
By lifting the starboard side of 0, the hull 10 turns to the left.

On the other hand, when the hull 10 is traveling at high speed, even if either the left or right flaps 30L and 30R try to swing downward by operating the steering handle 13, the flaps 30L and 30R act on the flaps 30L and 30R. Since the water pressure is equal to or higher than a predetermined pressure, the contraction of the coil springs 33L and 33R keeps the flaps 30L and 30R upwardly rocked by water pressure, effectively preventing the steering effect when unnecessary. .

Further, since the slide plate 27 and the cables 32L and 32R of the revolving arm 29 constitute a drive mechanism, and the coil springs 33L and 33R constitute an extension / contraction mechanism, the drive mechanism and the extension / contraction mechanism are mechanical. Since it can be configured, a control device such as an electronic system is not required, which reduces the cost and improves the operation reliability and durability.

In the above embodiment, each flap 30L, 3
Although the 0R is arranged at the left and right positions of the rear bottom 10a of the hull 10, it may be arranged at the left and right positions of the bottom plate and the rear parts of the left and right sponsons. Further, although the coil spring is used as the expansion / contraction mechanism, it is also possible to use a cylinder.

[0032]

As is apparent from the above description, according to the present invention, when the steering wheel is operated to the right while the engine is stopped or idling and the vehicle is moving forward by inertia, the drive mechanism moves to the left. When the flap swings downward and protrudes into the water, lift force is generated and the port side of the hull is lifted, and the hull turns to the right, resulting in good rudder control and good turning performance. It will improve.

Further, when the hull is traveling at a high speed, even if the steering handle is operated and one of the left and right flaps swings downward, the water pressure acting on the flap is equal to or higher than a predetermined pressure. As a result, the contraction of the elastic member causes the flap to remain oscillated upward by water pressure, effectively preventing the steering effect when unnecessary.

If the drive mechanism is composed of a slide plate, a swing arm, and left and right cables, and the expansion / contraction mechanism is composed of left and right coil springs (claim 2), the drive mechanism and the expansion / contraction mechanism can be structured mechanically. Therefore, a control device such as an electronic system is not required, which reduces costs and improves the reliability and durability of operation.

[Brief description of drawings]

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

FIG. 2 is a perspective view in which the deck portion of the hull is omitted.

FIG. 3 is a system diagram of a steering portion.

FIG. 4 is a perspective view of a slide plate and a swing arm.

FIG. 5 is a side view of a flap and a coil spring.

[Explanation of symbols]

10 hulls 13 steering wheel 15 engine 16 jet propulsion 18 injection nozzle 19 deflector 25 (A, B) Steering cable 27 Slide plate (drive mechanism) 27f slot 29 Swivel arm (drive mechanism) 29c pin 30 (L, R) flaps 32 (L, R) cable (drive mechanism) 33 (L, R) coil spring (expansion and contraction mechanism) D downward swing

Claims (2)

[Claims] 1. A jet flow generated by a jet propulsion machine driven by an engine is forwarded by injecting the jet flow backward from an injection nozzle, and a deflector is swung left and right by a steering cable interlocked with the operation of a steering handle to turn. In a water jet propulsion watercraft, flaps that are normally along the hull and that can project into the water are provided at the left and right positions of the hull so that they can swing up and down. A drive mechanism for driving the flap on the side opposite to the drive is provided so as to project into the water, and an expansion / contraction mechanism that allows the flap to swing upward when the water pressure exceeds a predetermined pressure is provided between this drive mechanism and each flap. A water jet propulsion boat characterized by being provided. 2. The drive mechanism includes a slide plate that is moved back and forth by a steering cable, a swing arm that swings left and right in conjunction with the slide plate via a pin and an elongated hole, and left and right portions of the swing arm. The water jet propulsion system according to claim 1, wherein the water jet propulsion system comprises left and right cables that connect the left and right flaps, respectively, and the expansion and contraction mechanism includes left and right coil springs that are respectively interposed between the left and right cables. Boat.