JP2003026085A - Power board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power board capable of improving portability, capable of reducing weight, and capable of securing large buoyancy. SOLUTION: This power board 1 is formed by arranging an engine 9, and a water jet propelling machine 10 driven by this engine in a rear part of a hull 2. The hull 2 is expandably-contractibly constituted of an elastic body (rubber). Since the hull 2 is expandably-contractibly constituted of the elastic body (the rubber), when carrying the power board 1, the hull 2 can be miniaturized by bleeding air from the hull 2, and the power board 1 can be easily carried so that the portability is enhanced. Since the hull 2 is constituted of the lightweight elastic body (the rubber) inflating by air instead of a conventional rigid body, weight of the power board 1 can be reduced, and high buoyancy can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power board in which an engine and a water jet propulsion machine driven by the engine are arranged in the rear portion of a hull.

[0002]

2. Description of the Related Art A power board in which an engine and a water jet propulsion machine driven by the engine are arranged at the rear part of a hull slides on water by the thrust generated in the water jet propulsion machine. The hull is, for example, FRP
It was constructed as a rigid body.

[0003]

However, if the hull of the power board is made of a rigid body as in the prior art, not only is the overall volume and weight increased and the portability is poor, but also a sufficiently large buoyancy can be obtained. There was a problem that it could not be done and it was difficult to seat two people.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power board capable of improving portability, reducing weight, and securing a large buoyancy.

[0005]

In order to achieve the above object, the invention according to claim 1 is a power board in which an engine and a water jet propulsion device driven by the engine are arranged in a rear portion of a hull. It is characterized in that the hull is made of an elastic material so that it can expand and contract freely.

According to a second aspect of the invention, in the first aspect of the invention, the engine and the water jet propulsion device are integrally housed in a box-shaped casing to form a power unit.

According to a third aspect of the present invention, in the second aspect of the invention, the power unit is housed in the recess of the hull, and the hull and the power unit are combined and integrated by concavo-convex fitting to form a box of the power unit. It is characterized in that the upper surface of the cylindrical casing is connected to the upper surface of the hull to form a deck.

Therefore, according to the first aspect of the invention, since the boat body is constructed of the elastic body so as to be able to expand and contract freely, air is evacuated from the boat body when the power board is conveyed to make the boat body small. The power board can be easily transported, and its portability is enhanced. Further, since the hull is made of a lightweight elastic body that expands with air instead of the conventional rigid body, it is possible to reduce the weight of the power board and obtain high buoyancy.

According to the second aspect of the present invention, since the engine and the water jet propulsion device are integrated as a power unit, the detachability of the power unit with respect to the hull is enhanced and the maintainability of the engine and the water jet propulsion device is enhanced. To be

According to the third aspect of the present invention, since the hull and the power unit are connected and integrated by the concave and convex fitting, the detachability of the power unit with respect to the hull is enhanced. Further, since the upper surface of the power unit itself is connected to the upper surface of the hull to form a deck, the structure is simplified and the detachability of the power unit with respect to the hull is enhanced.

[0011]

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

FIG. 1 is a cutaway side view of a power board according to the present invention, FIG. 2 is a cutaway plan view thereof, FIG. 3 is a bottom view thereof, FIG. 4 is a front view thereof, and FIG. 5 is a power unit engine and water jet propulsion machine. FIG. 6 is an exploded perspective view of the power board, and FIG. 7 is an exploded perspective view of the hull of the power board.

The power board 1 according to the present embodiment is constructed by detachably incorporating a power unit 3 in a rear portion of a flat hull 2 having a streamlined shape.

Thus, in the present embodiment, the hull 2 is a kind of rubber boat which is made of a rubber sheet and is inflatable and contractible by injecting air (inflatable), and its upper surface is open at its rear part. A recess 2a is formed.

Here, the details of the structure of the hull 2 will be described with reference to FIG. 7. The hull 2 has a cylindrical peripheral edge portion 2A so as to surround the entire circumference except the rear surface, and the entire lower surface thereof. A rubber sheet is adhered over to form the bottom plate 2B. A partition wall sheet 2C curved forward is provided between the left and right portions of the peripheral edge portion 2A.
Both ends thereof are adhered to the left and right portions of the peripheral edge portion 2A, and the lower edge thereof is adhered to the bottom plate 2B.

Further, two deck sheets 2D and 2E are adhered to the upper surface of the front space defined by the peripheral edge portion 2A, the bottom plate 2B and the partition wall sheet 2C, and the upper surface of the front space is covered to cover the inside thereof. It constitutes a sealed part. At this time, a plurality of connecting sheets 2F, 2 are provided between the bottom plate 2B and the deck sheets 2D, 2E.
G is interposed, and the hull 2 is maintained in a desired board shape by these connecting sheets 2F and 2G. Then, a wooden transom board 1 is provided at each rear end of the peripheral portion 2A and the bottom plate 2B.
By adhering 3 to each other, the concave portion 2a whose rear surface is a flat surface and the other three surfaces (front surface and left and right side surfaces) form a convex arc curved surface is formed in the rear portion of the boat body 2, and the upper surface of the concave portion 2a is opened. ing. The bottom plate 2B of the hull 2 is formed with a hole 2b for opening a suction port 35a of a pump housing 35 of the water jet propulsion device 10 described later and two circular holes 2c for opening an exhaust pipe. There is. Also, the transom board 13
A circular hole 13a for opening a nozzle 39 of the water jet propulsion machine 10 described later is formed in the center of the width direction of the circular hole 13a, and a circular hole 13a for opening a drain pipe 18 described later is formed on both sides thereof.
b is formed. As shown in FIG. 2, air injection valves 2d for injecting air into the hull 2 are provided at two locations on the bottom surface of the hull 2.

As shown in FIGS. 1 and 2, a ring 4 is attached to the center of the front upper surface of the hull 2 in the width direction, and one end of a wire handle 5 is connected to the ring 4. A grip 6 is attached to the other end of the wire handle 5.
Is attached. In addition, as shown in FIG.
A pair of left and right grips 7 are attached to two front and rear portions at a portion facing each other across the concave portion 2a on the upper surface of.

On the other hand, the power unit 3 is constructed by integrating an engine 9 and a water jet propulsion machine 10, both of which are housed in a box-shaped casing 11 made of metal or resin, and a rectangular flat plate-shaped base plate 12. Positioned and mounted on top.

Here, the casing 1 of the power unit 3
As shown in FIG. 6, reference numeral 1 is composed of a main body 11A and a lid 11B, and when the upper body is joined together, it is shaped to follow the shape of the concave portion 2a of the boat body 2, and the front surface thereof is shown in FIG. As shown in FIG. 2, the concave surface 2a of the hull 2 is formed into a concave curved surface along the arcuate convex curved surface, and both side surfaces are also concave curved surface along the cylindrical curved surface on the left and right sides of the peripheral edge portion 2A of the hull 2. (See FIG. 6).

Inside the lid 11B of the casing 11, the space inside the casing 11 is divided into upper and lower two chambers S1.
The plate 15 for partitioning into S2 is provided, and the chamber S1
Four intake ports 14 are opened on the upper peripheral surface of the lid body 11B facing the above, and both chambers S1 and S2 are communicated with each other by an intake pipe 16 provided upright on a plate 15. The periphery of the upper end of the intake pipe 16 is covered with a cylindrical cap 17 that hangs from the upper surface of the lid 11B. Further, drain pipes 18 that open to the chamber S1 are attached to the left and right of the plate 15, and each drain pipe 18 extends rearward, and its rear end is attached to the rear wall of the casing 11 and projects rearwardly. is doing.

By the way, the engine 9 has 2 cycles 2
As shown in detail in FIG. 5, the horizontally opposed engine of a cylinder has a horizontally opposed engine 9 in which cylinders 20 are horizontally opposed to each other around a crankshaft 19 arranged in the front-rear direction. It is configured. A piston 21 is slidably inserted in each cylinder 20 in the horizontal direction, and each piston 21 is connected to the crankshaft 19 via a connecting rod 22.
The reciprocating linear motion of the cylinder in the cylinder 20 is converted into the rotary motion of the crankshaft 19 by the connecting rod 22.

Spark plugs 23 are screwed onto the outer ends of the cylinders 20, respectively. As shown in FIG. 1, the upper portion of a crankcase 24 disposed between the cylinders 20 is provided with intake air. A pipe 25 is connected, and a carburetor 26 is connected to an end portion of the intake pipe 25 bent rearward. Although not shown, a reed valve is provided at the inlet of the intake pipe 25 to the crankcase 24.

A flywheel magneto 27 is attached to a front end portion of the crankshaft 19 which projects forward from the crankcase 24, and a ring gear 28 is attached to a front end surface thereof. The ring gear 28 has a starter motor. The gear 30 of 29 is meshed. Further, as shown in FIG. 2, a battery 31 and a fuel tank 32 are arranged on the left and right in front of the engine 9.

As shown in FIGS. 2 and 5, the exhaust gas discharged from the lower surface of each cylinder 20 of the engine 9 passes through the exhaust muffler 34 and is then discharged from the exhaust port 33 to the lower surface of the hull 2. It

Next, the structure of the water jet propulsion machine 10 will be described.

The water jet propulsion device 10 is constructed by mounting an impeller 37 on an impeller shaft 36 arranged in the pump housing 35 in the front-rear direction, and on the inner peripheral surface of the pump housing 35 behind the impeller 37. A plurality of attached flow regulating plates 38 are arranged. Further, the suction port 35a of the pump housing 35 is open to a hole 2b formed in the bottom plate 2B of the boat body 2 (see FIG. 3), and the nozzle 39 attached to the rear end of the pump housing 35 is a transom board. The circular hole 13a of 13 is open rearward.

By the way, the impeller shaft 36 is coaxially directly connected to the crankshaft 19 of the horizontally opposed engine 9 by a coupling 40, and both are centered when the engine 9 and the water jet propulsion machine 10 are attached to the base plate 12. Done In this way, the crankshaft 19 and the impeller shaft 3
Since the centering with 6 is performed outside the hull 2 before the power unit 3 is assembled into the hull 2, the two can be centered with good workability and high precision.

The assembly of the power unit 3 into the hull 2 in which air has been injected in advance is carried out in the following manner.

That is, in a state where the hull 2 is deflated and the hull 2 is slightly contracted, the power unit 3 is inserted into the recess 2a of the hull 2, and the nozzle 39 and the drain pipe 18 are connected to the circle of the transom board 13. The holes 13a and 13b are fitted respectively.

From the above state, if air is further enclosed in the hull 2 and the hull 2 is inflated, as shown in FIG.
The convex curved surfaces of the front surface of the concave portion 2a of the power unit 3 are fitted to the concave curved surfaces of the front surface of the casing 11 of the power unit 3, and the cylindrical convex curved surfaces on the left and right sides of the peripheral portion 2A of the hull 2 are on both sides of the casing 11 of the power unit 3. Since the hull 2 is fitted into the concave curved surface formed on the surface, the hull 2 is pneumatically driven to the power unit 3
Is clamped in the recess 2a, whereby the hull 2 and the power unit 3 are easily and surely combined and integrated without using a fastening member, and the assembling of the power unit 3 to the hull 2 is completed.

As shown in FIG. 2, the power unit 3
A throttle wire 41 extending from the throttle system is routed on the upper surface of the hull 2 and connected to the operation portion of the grip 6.

By the way, in the power board 1 according to the present embodiment, the box-shaped casing 1 of the power unit 3 is used.
The upper surface of 1 is connected to the upper surface of the hull 2 to form a deck.

When an occupant standing on the deck of the power board 1 operates a starter button (not shown), the starter motor 29 is driven to start the engine 9, and each cylinder 20 of the engine 9 is driven. Due to the negative pressure generated in the intake stroke, fresh air is introduced from the intake port 14a into the chamber S1 in the casing 11 of the power unit 3, the fresh air flows through the intake pipe 16 to the chamber S2, and then to the carburetor 26. The mixture is sucked to form an air-fuel mixture having a desired air-fuel ratio. This air-fuel mixture is introduced into the crankcase 24 of the engine 9 through a reed valve (not shown), is primarily compressed in the crankcase of the crankcase 24, and is then supplied to each cylinder 20 for combustion.

Exhaust gas generated by combustion of the air-fuel mixture in each cylinder 20 is discharged from the exhaust port 33 into the water on the lower surface of the hull 2 through the exhaust muffler 34.

The above operation is repeated and the engine 9 is continuously operated. The rotation of the crankshaft 19 of the engine 9 causes the impeller shaft 36 of the water jet propulsion machine 10 and the impeller attached thereto. 37 is rotationally driven in the pump housing 35, and by the rotation of the impeller 37, the water sucked from the suction port 35a of the pump housing 35 is jetted rearward from the nozzle 39, and is generated by the jetting of this water rearward. The power board 1 glides on the water by the thrust. In this case, turning of the power board 1 to the left and right is performed by changing the posture of the occupant on the hull 2.

In the above, in the present embodiment,
Since the hull 2 of the power board 1 is configured to be expandable and contractible with rubber, the hull 2 can be reduced in size by removing air from the hull 2 when the power board 1 is transported. Can be easily transported, and its portability is enhanced. Further, since the hull 2 is made of lightweight rubber that expands with air instead of the conventional rigid body, it is possible to reduce the weight of the power board 1 and obtain high buoyancy.

Furthermore, in the present embodiment, the engine 9 and the water jet propulsion machine 10 are integrated as the power unit 3, so that the detachability of the power unit 3 from the hull 2 is enhanced and the engine 9 and the jet propulsion machine 10 are improved.
Maintainability is improved.

Further, since the boat body 2 and the power unit 3 are connected and integrated by concave and convex fitting, the detachability of the power unit 3 with respect to the boat body 2 is enhanced. And
Since the upper surface of the power unit 3 itself is connected to the upper surface of the hull 2 to form a deck, the structure of the power board 1 is simplified and the detachability of the power unit 3 with respect to the hull 2 is enhanced.

[0039]

As is apparent from the above description, according to the present invention, in a power board in which an engine and a water jet propulsion device driven by the engine are arranged at the rear portion of the hull, the hull is elastic. Because it is configured to expand and contract with the body,
It is possible to improve the portability of the power board, reduce the weight, and secure a large buoyancy.

[Brief description of drawings]

FIG. 1 is a cutaway side view of a power board according to the present invention.

FIG. 2 is a cutaway plan view of a power board according to the present invention.

FIG. 3 is a bottom view of the power board according to the present invention.

FIG. 4 is a front view of a power board according to the present invention.

FIG. 5 is a plan sectional view of an engine, a water jet propulsion device, and an exhaust muffler portion of a power unit.

FIG. 6 is an exploded perspective view of a power board according to the present invention.

FIG. 7 is an exploded perspective view of a hull of a power board according to the present invention.

[Explanation of symbols]

1 power board 2 hulls 2a recess 3 power units 9 engine 10 Water jet propulsion machine 11 Box-shaped casing

Claims (3)

[Claims] 1. A power board in which an engine and a water jet propulsion device driven by the engine are arranged at a rear portion of a hull, wherein the hull is configured to be expandable and contractible by an elastic body. . 2. The power board according to claim 1, wherein the engine and the water jet propulsion device are integrally housed in a box-shaped casing to form a power unit. 3. A deck in which the power unit is housed in a recess of the hull, the hull and the power unit are joined and integrated by concave and convex fitting, and the upper surface of the box-shaped casing of the power unit is continuous with the upper surface of the hull. The power board according to claim 2, wherein