JP2002068088A - Jet propulsion-type planing boat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jet propulsion-type planing boat having a steering means capable of steering in cooperation with a conventional steering mechanism in a jet propulsion-type planing boat capable of keeping the steering of the boat even in reducing the water jet amount from a water jet pump. SOLUTION: In this jet propulsion-type planing boat jetting the water and planing on the water surface by its reaction force, steering members 1 are mounted on both gunwales of a transom board T rotatably at a predetermined angle to provide a state of increasing the resistance with the water and a state of decreasing the resistance with the water, a tip of a connecting member 2 having a joint 2A made of an elastic body at least on its curved part, is integrally turnably connected to a rotating shaft of the steering member 1, and a basic end of the connecting member 2 is connected to a steering nozzle 18 through a coupling member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal watercraft (personal watercraft) that jets a stream of water backward and sails on the water in reaction to the jet.
Watercraft (Personal Watercraft); PWC
Jet-propelled personal watercraft (also referred to as "propulsion pump"), especially when the amount of water jetted from a water jet pump for propulsion (also referred to as a propulsion pump) is reduced. About boats.

[0002]

2. Description of the Related Art In recent years, so-called jet propulsion type personal watercraft have been widely used for leisure, sports or rescue. In this jet propulsion type personal watercraft, the water hull is generally propelled by pressurizing water with a water jet pump and jetting the water backward from a water inlet provided on the bottom surface of the boat. In the case of this jet-propulsion planing boat, the boat is changed by oscillating the steering nozzle disposed behind the jet port of the water jet pump to the left or right, thereby changing the jetting direction of water from behind. Steer right or left.

[0003] Therefore, in the case of a jet-propulsion personal watercraft having such a configuration, when the throttle is closed and the amount of water jetted from the water jet pump decreases, the force available for turning the boat (for steering). The available power) is also reduced, and the ability to steer the boat is reduced until the throttle reopens.

In view of such a situation, the present applicant has developed a steering member for steering that can maintain the mechanical steering ability even when the throttle is closed and the amount of water jetted from the water jet pump is reduced. Provided a jet-propelled planing boat equipped with it (Japanese Patent Application No. 2000-6708).
issue).

However, when an external force acts on the non-operating state side in the operating state of the steering member, the external force acts on the steering member as it is.

The present invention has been made in view of such a situation, and a jet propulsion type personal watercraft which can maintain steering of a boat even when the amount of water jetted from a water jet pump is reduced. It is an object of the present invention to provide a jet-propulsion personal watercraft provided with a steering means capable of steering in cooperation with a conventional steering mechanism.

[0007]

The present invention solves the above-mentioned problems,
The problem can be solved by a jet propulsion planing boat having the following configuration. That is, in a jet-propulsion personal watercraft according to the present invention, in a jet-propulsion personal watercraft that jets water and slides on the water surface by the reaction force, a steering member is provided on each side of the transom board, and a resistance to water is provided. In order to form a state in which the resistance becomes larger and a state in which the resistance becomes smaller, the rotation member is disposed so as to be rotatable at a predetermined angle, and the rotation shaft of the steering member has a joint made of an elastic material at least in a curved portion. The distal end of the connecting member is connected so as to rotate integrally, and the base end of the connecting member is connected to the steering nozzle via a connecting member. The member is configured to operate.

According to the jet-propelled personal watercraft constructed as described above, the steering operation causes the steering nozzle to swing correspondingly,
The swinging operation is performed by operating the steering member disposed on the side of the side to be turned through the connecting member and the connecting member in a state in which resistance to water is increased, so that one side of the boat (the side to be turned) In addition, when the water jet pump (propulsion pump) is injecting a sufficient amount of water by increasing the water resistance on the side of the ship, the steering ability is reduced even when the injection amount is reduced. The boat can be steered (turned) in any direction to the left or right without turning. When an external force acts on the steering member, the external force elastically deforms the joint portion of the connecting member in the rotational direction, and the steering member rotates to act to reduce the external force. Further, since the steering member is operated by using the swinging of the steering nozzle to the left and right, the number of parts is reduced and the configuration is simple compared to a case where the steering member is remotely operated from a steering handle. .

Further, in the jet propulsion planing boat, the connecting member has elasticity in a direction in which a shaft rotates, and is provided between the connecting member and the connecting member and the steering nozzle side. Are connected through spherical joints, the structure is highly rigid, and the steering member can be rotated by a predetermined angle in conjunction with the left and right swing of the steering nozzle.

In the jet-propulsion personal watercraft, the elastic force in the rotational direction of the joint does not substantially rotate due to the resistance of water during low-speed navigation, but rotates by a predetermined angle according to the speed during high-speed navigation. And when it is elastic force that rotates according to the contact force when it comes into contact with something,
At a low speed, the steering function is obtained, and when something comes into contact with the steering member and an external force is applied, it is temporarily deformed by the elastic action of the joint, so that the impact can be reduced. This is a preferred embodiment.

In the jet-propulsion personal watercraft, it is a preferable embodiment that the joint is a coiled joint made of a polymer material such as carbon fiber or glass fiber because corrosion resistance is high.

Further, in the jet-propulsion personal watercraft, the joint may be a coiled joint made of metal, and in this case, it is preferable that the joint be made of a highly corrosion-resistant metal material such as stainless steel. Becomes

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a jet-propulsion personal watercraft equipped with steering members on both sides of a transom board according to an embodiment of the present invention. This will be described specifically. 1 is an overall side view of the personal watercraft according to the embodiment of the present invention, FIG. 2 is an overall plan view of the personal watercraft of FIG. 1, FIG. 3 is a rear view of the personal watercraft shown in FIG. FIG. 4 is a partially enlarged rear view of the boat showing a steering member for steering employed in the personal watercraft shown in FIG. 3, a connecting member for connecting the steering member with a steering nozzle, a connecting member, and the like. FIG. 5 is a partially enlarged side view of the connecting member and the connecting member, etc., partially cut away, as viewed from the direction of arrows VV in FIG.

In FIGS. 1 and 2, A is a hull, and this hull A is composed of a hull H and a deck D covering the hull H. A connection line connecting the hull H and the deck D all around is a gunnel line. G. In this embodiment, the gunnel line G is located above the waterline L (waterline in a non-sliding state) of the personal watercraft. At a position slightly behind the center of the deck D, as shown in FIG. 2, an opening 16 having a substantially rectangular shape in plan view and having an upper surface extending along the longitudinal direction of the hull A is formed. As shown in the figure, a seat S for riding is arranged above the opening 16. The engine E is arranged in a space having a “convex” cross-sectional shape surrounded by the hull H and the deck D below the seat S. This engine E is a multi-cylinder (three-cylinder in this embodiment) engine E, and has a crankshaft 10b mounted in a direction along the longitudinal direction of the hull A as shown in FIG. The output end of the shaft 10b is, as shown in FIG.
Via a propeller shaft 15, it is integrally rotatably connected to a pump shaft side of a water jet pump P to which an impeller 21 is attached. And this impeller 2
1 has an outer periphery covered with a pump casing 21C, takes in water taken in from a water inlet 17 provided on the bottom surface of the personal watercraft through a water suction passage, and pressurizes with a water jet pump (propulsion pump) P. -It is configured to accelerate and pass through a pump nozzle (spouting part) 21R whose water cross-sectional area has become smaller as it goes rearward, and to discharge from a rear end injection port to obtain a propulsive force. In FIG. 1, 21 V is a stationary blade for rectification. In FIGS. 1 and 2, reference numeral 10 denotes a steering handle. By operating the handle 10 left and right, a steering wheel behind the pump nozzle 21R is pushed through a push-pull cable Ca (see FIG. 2). The boat 18 can be steered in a desired direction when the water jet pump P is operated (water injection) by swinging the nozzle 18 left and right about a swing shaft 18a (see FIG. 2) arranged vertically. It is configured as follows. As shown in FIG. 1, a reverse deflector 19 (see FIG. 1) is provided above and behind the steering nozzle 18 so as to be able to swing downward around a horizontally arranged swing shaft (not shown). 1) is arranged, and the water discharged from the steering nozzle 18 is turned forward by swinging the bowl-shaped deflector 19 to the lower position behind the steering nozzle 18 so that the water can be moved backward. Have been.

1 and 2, reference numeral 12 denotes a rear deck. The rear deck 12 is provided with an openable / closable hatch cover 29, and a small-capacity storage box is formed below the hatch cover 29. I have. Also, in FIG.
A front hatch cover 23 is provided below the hatch cover 23 with a box (not shown) for storing equipment and the like. Further, another hatch cover 25 is disposed above the front hatch cover 23 to form a two-layer hatch cover. The hatch cover 25 has an opening (not shown) provided at a rear end face. ) Can accommodate a life jacket or the like inside. In addition, as shown in FIG.
It protrudes rearward from the rear transom board.

A steering member 1 having a steering function according to an embodiment of the present invention, and the resistance to water is increased from a small state to a large state in conjunction with the swinging operation of the steering member 1 to the left and right of a steering nozzle 18. The mechanism for changing the state is configured as follows. That is, as shown in FIG. 3 or FIG. 4 which is an enlarged view of a main part thereof, or FIG. 5 which is a partially enlarged side view, in this embodiment, the steering member 1 has a wing thickness gradually as a whole at the rear end side. It has a thin wing shape, and a rotating shaft 1a protrudes on both sides at the front end of the wing shape. Then, the rotating shaft 1a of the steering member 1 is rotatably fitted into the mounting hole 5a of the mounting member 5 integrally mounted on the transom board T. As a result, the steering member 1 is moved to the position shown in FIG. It is possible to change from a state in which the resistance with water shown in the drawing is small to a state in which the resistance with water shown in FIG. 6 is large. As shown in the enlarged view of FIG. 4, of the rotating shafts 1 a on both sides of the steering member 1, the rotating shaft 1 a at the center of the boat is integrally rotated with the distal end of the connecting member 2. It is linked to be. In addition, a joint 2A made of an elastic material capable of transmitting a force in the rotational direction and deforming freely in the longitudinal direction of the shaft is interposed at the center of the connecting member 2. In this embodiment, a coiled joint is disclosed as the joint 2A. The connecting member 2
Is rotatably held on the transom board T side via the fixing member 3. A flange member 2B is integrally formed at a base end of the connecting member 2 (the center of the boat). The flange member 2B is connected to the distal end 7a of the connection member 7 so that the connection angle can be freely changed. The base end 7b of the connecting member 7 is connected to the steering nozzle 18 so that the connecting angle can be freely changed. In other words, between the flange member 2B and the distal end portion 7a of the connecting member 7, and between the proximal end portion 7b of the connecting member 7 and the steering nozzle 18, via a so-called "spherical joint (ball joint mechanism)", respectively. Are linked. Specifically, a male part of a “spherical joint” having a spherical tip is protruded from the flange member 2B and the steering nozzle 18 side. At both ends of the connecting member 7, a female portion having an inner peripheral surface formed into a partial spherical surface is formed to accommodate the spherical portion, and the female member accommodates the male member, thereby forming a connection angle. Can be changed freely.

As shown in FIG. 1, the steering member 1 is located at a position where the boat is submerged when the boat is stopped or traveling at a low speed with respect to the water surface. When sailing at high speed,
Since the entire boat floats, only the portion of the steering member 1 from the center of the boat comes into contact with water.

The other parts of the joint 2A and the connecting member 2 are not particularly limited in material, but are made of a polymer such as carbon fiber or glass fiber, or stainless steel. Are preferred in that they have high corrosion resistance. However, steel may be plated.

Thus, the personal watercraft according to the present invention configured as described above operates as follows. That is,
When the steering wheel 10 is steered to the right or left, if the steering wheel 10 is turned to the steered side, for example, to the right, as shown in FIG. 6, the rear end of the steering nozzle 18 is centered on the swing shaft 18a. As a result, the connecting member 2 is rotated (rotated counterclockwise as shown by an arrow R in FIG. 5) via the connecting member 7 and arranged on the starboard side. Steering member 1
The rear end pivots downward as shown by the solid line in FIG. 6 or the two-dot chain line in FIGS. As a result, in the speed region where the personal watercraft can be steered by the reaction force of the water jetted from the steering nozzle 18, the personal watercraft can be steered by the reaction force of the jetted water.
Due to the resistance generated between the steering member 1 and the water flow, when the boat is steered, for example, when the boat is turned rightward, the resistance between the steering member 1 arranged on the starboard side and the water is large. The vehicle turns to the right due to the difference in resistance between the water on both sides. That is, the steering force by the steering member 1 acts in the same direction as the steering direction of the steering nozzle 18. Therefore, the steering performance is further improved as compared with the conventional personal watercraft.

On the other hand, the personal watercraft has a large resistance between the starboard steering member 1 and the water even in a speed region where the steering ability due to the reaction force of the water jetted from the steering nozzle 18 is not sufficient. In this state, the water resistance on the starboard side increases as compared with the port side, and the vehicle can turn right.

As shown by a solid line in FIG. 6 or a two-dot chain line in FIG. 5, when the rear end of the steering member 1 is lowered, or in other states, the steering member 1 When something abuts,
Due to the rotation of the connecting member 2 due to the elastic action of the joint 2A, the steering member 1 rotates to reduce the impact due to the contact.

When a large flow of water flows in contact with the rear end of the steering member 1 while the boat is navigating at a high speed and a large resistance is generated, the joint 2A
Is pivoted to alleviate the downward rotation of the rear end of the steering member 1. As a result, when the resistance between the steering member 1 and the water is large at the time of high-speed navigation, the turning operation can be performed smoothly.

The shape of the steering member 1 is not limited to the wing shape, but may be any shape. However, when the steering nozzle 18 is at the neutral position, the resistance to water is reduced. When the rear end of the steering nozzle 18 is operated left or right, for example, when the rear end is operated rightward when viewed from behind,
It is sufficient that the steering member 1 is changed from a state in which resistance to water to a state in which the resistance is small to a state in which the resistance is large according to the operation amount.

[0024]

According to the present invention, the steering of the boat can be maintained even when the amount of water jetted from the water jet pump decreases, and when an external force acts on the steering member, the external force can be maintained. Can be alleviated. In addition, a special steering remote mechanism for operating the steering member by using the steering remote mechanism of the steering nozzle becomes unnecessary, so that the number of parts can be reduced and the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall side view of a personal watercraft according to an embodiment of the present invention.

FIG. 2 is an overall plan view of the personal watercraft of FIG.

FIG. 3 is a rear view of the personal watercraft shown in FIG. 1 in which an upper portion is omitted.

FIG. 4 is a partially enlarged rear view of the boat showing a steering member for steering employed in the personal watercraft shown in FIG. 3, a connecting member for connecting the steering member with a steering nozzle, a connecting member, and the like. FIG.

FIG. 5 is a partially enlarged side view of the connecting member and the connecting member, etc., partially cut away, as viewed from the direction of arrows VV in FIG. 4;

FIG. 6 when the steering of the boat is operated to the right.
FIG. 7 is a partially enlarged rear view showing an operation state of the steering member shown in FIG.

[Explanation of symbols]

 T: transom board 1: steering member 2: connecting member 2A: joint 7: connecting member 18: steering nozzle

Claims (5)

[Claims] 1. A jet-propulsion personal watercraft that jets water and slides on the water surface by the reaction force thereof. A steering member is provided on both sides of a transom board in a state where resistance to water is large and a state where resistance to water is large. In order to form a state in which the resistance is reduced, and arranged to be rotatable at a predetermined angle, the rotating shaft of the steering member, the tip of the connecting member having a joint made of an elastic material at least in a curved portion,
The connecting member is connected so as to rotate integrally, and the base end of the connecting member is connected to the steering nozzle via a connecting member, so that the steering member operates in conjunction with the right and left swinging of the steering nozzle. A jet propulsion planing boat, characterized in that it is configured. 2. The connecting member has elasticity in a direction in which a shaft rotates, and a spherical joint is provided between the connecting member and the connecting member and between the connecting member and the steering nozzle. A jet propulsion planing boat, wherein the personal watercraft is connected to the watercraft via a jet. 3. The elastic force of the joint in the rotational direction is:
With the resistance of water at low speeds, it does not substantially rotate, but at high speeds, it rotates by a predetermined angle according to its speed, and when it comes into contact with something, it has an elastic force that rotates according to its contact force The jet propulsion planing boat according to claim 1 or 2, wherein 4. The joint according to claim 1, wherein the joint is a coiled joint made of a polymer material.
The jet propulsion planing boat according to any one of the above items. 5. The jet propulsion personal watercraft according to claim 1, wherein the joint is a coiled joint made of metal.