JP2002193185A - Surfboard with engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surfboard with an engine improved in getting-on/off performance by suppressing the height of a boat body rear part low while ensuring high turning performance, having excellent controllability being able to take a free riding position and suppressing engine vibration low. SOLUTION: This surfboard 1 with the engine is constituted by arranging a horizontal cylinder engine 4 provided with a crankshaft 16 disposed in the longitudinal direction of a boat body 2, and a jet unit 5 provided with an impeller shaft 16 coaxially connected to the crankshaft 16 of the horizontal cylinder engine 4, at the rear part in the boat body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surfboard with an engine including a power unit including an engine and a jet unit.

[0002]

2. Description of the Related Art A surfboard with an engine having a power unit composed of an engine and a jet unit slides on water by the thrust generated in the jet unit. When arranged at the front of the vehicle, there is a problem that the turning radius becomes large and satisfactory turning performance cannot be obtained.

In view of this, there has been proposed a surfboard with an engine in which a power unit is arranged at a rear portion of a hull (see Japanese Patent Publication No. 6-96398).

[0004]

However, in a conventional surfboard with an engine in which a power unit is arranged at the rear of the hull, the height of the rear of the hull is increased due to the power unit, and the surfboard gets on and off from the rear of the hull. In addition to this, there is a problem that not only is it difficult to get on and off, but also that the position where the occupant stands is restricted and a free riding position cannot be obtained. Further, there is also a problem that the engine vibration is large, and the vibration propagates to the hull, which causes discomfort to the occupant.

[0005] The present invention has been made in view of the above problems, and its object is to secure high turning performance while maintaining high turning performance.
The height of the rear part of the hull is kept low to improve getting on and off, and
An object of the present invention is to provide a surfboard with an engine that can take a free riding position and is excellent in maneuverability and can suppress engine vibrations.

[0006]

To achieve the above object, the present invention provides a horizontal cylinder engine having a crankshaft arranged in the longitudinal direction of a hull, and coaxially connected to the crankshaft of the horizontal cylinder engine. A surfboard with an engine is constructed by arranging a power unit including a jet unit having an impeller shaft provided at a rear portion of a hull.

Therefore, according to the present invention, since the horizontal cylinder engine and the jet unit, which are heavy objects, are arranged at the rear part of the hull, the turning radius of the surfboard with the engine is reduced, and the surfboard with the engine has high turning performance. Secured. And since the horizontal cylinder engine was adopted as the drive source, the height of the rear part of the hull was kept low, so that it was easy to get on and off the surfboard with the engine from the rear part of the hull, so that the getting on and off property was improved, and the overall length of the hull was improved. , The upper surface can be kept low and flattened, and the occupant can take a free riding position.
Also, engine vibration can be kept low.

[0008]

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

FIG. 1 is a side view of a surfboard with an engine according to the present invention, and FIG. 2 is a plan view of the surfboard with the engine.

A surfboard with an engine (hereinafter simply referred to as a surfboard) 1 shown in FIGS. 1 and 2 has a power unit 3 arranged in a rear space inside a streamlined flat hull 2. Here, the power unit 3 is configured by integrating the horizontal cylinder engine 4 and the jet unit 5, and the details of the configuration will be described later.

A floor deck 2a which forms a horizontal plane is formed on the upper surface of the hull 2 in front of the power unit 3, and an air intake 6 is fixedly provided on the front end of the hull 2. I have. Here, front and rear of the air intake section 6 are open, and an intake pipe 7 is erected inside the opening.

On the other hand, a fuel tank 8 is disposed substantially at the center in the front-rear direction in the hull 2, and a starter motor 9 and a battery 10 are disposed on the left and right behind the fuel tank 8, respectively.

A rectangular box-shaped air separator 11 is disposed at the center in the width direction in the space in front of the fuel tank 8 in the hull 2, and a front end of the air separator 11 communicates with the intake pipe 7. A first intake duct 13 extending rearward from the left and right of the intake chamber 12 is connected. A second intake duct 14 extends from the front lower surface of the air separator 11, and a drain pipe 15 extending laterally from both rear side surfaces of the air separator 11 opens to both sides of the hull 2. are doing. The second intake duct 14 is open to a space in the hull 2.

Next, the configuration of the power unit 3 will be described in detail with reference to FIGS. 3 is a side sectional view of a power unit portion of the surfboard, and FIG. 4 is a plan sectional view of the power unit portion.

As described above, the power unit 3 connects the horizontal cylinder engine 4 and the jet unit 5 to a common base plate 4.
The horizontal cylinder engine 4 is a two-stroke two-cylinder engine, which is a crankshaft arranged at the center in the width direction of the hull 2 in the front-rear direction as shown in FIG. A cylinder 17 is horizontally arranged on the left and right of the cylinder 16 around the center of the cylinder 16. here,
A piston 18 is slidably inserted in each cylinder 17 in a horizontal direction. Each piston 18 is connected to the crankshaft 16 via a connecting rod 19.
The reciprocating linear motion in the cylinder 17 is converted into a rotational motion of the crankshaft 16 by the connecting rod 19.

A spark plug 20 is screwed to the outer end surface of each cylinder 17, and the intake pipe 41 is mounted on an upper part of a crankcase 21 disposed between the cylinders 17 as shown in FIG. And a carburetor 22 is provided at a front end of the intake pipe 41. In addition, the intake pipe 41
A reed valve (not shown) is provided in a portion of the crankcase 21 which opens to the crank chamber. A flywheel magneto 23 is attached to a front end of the crankshaft 16 projecting forward from the crankcase 21, and a ring gear 24 is attached to the front end surface of the flywheel magneto 23. Gear 9a can be meshed.

Next, the configuration of the jet unit 5 will be described.

The jet unit 5 is constructed by mounting an impeller 27 on an impeller shaft 26 disposed in the pump housing 25 in the front-rear direction, and mounted on the inner peripheral surface of the pump housing 25 behind the impeller 27. A plurality of straightening plates 28 are arranged. The nozzle 29 attached to the rear end of the pump housing 25 is
It opens from the back to the water.

The impeller shaft 26 is coaxially and directly connected to the crankshaft 16 of the horizontally opposed engine 4 by a coupling 42. The centering of both is performed when the engine 4 and the jet unit 5 are mounted on the base plate 40. You. Thus, the crankshaft 16 and the impeller shaft 26
The centering is performed outside the hull 2 before the power unit 3 is assembled into the hull 2, so that the centering can be performed with high workability and high accuracy.

Here, the procedure for assembling the power unit 3 to the hull 2 is shown in FIG. 5. An opening 2b is opened at the rear of the hull 2 as shown in the figure. The power unit 3 is assembled to the hull 2 by installing the base unit 3 from below and bolting the periphery of the base plate 40 to the lower surface of the hull 2. At the time of assembly, the left and right spark plugs 20 of the horizontal cylinder engine 4 are removed.

Since the power unit 3 having the above structure is constructed by integrating the horizontal cylinder engine 4 and the jet unit 5 on a common base plate 40, the power unit 3 is detachably attached to the hull 2 as it is. can do. For this reason, it is not necessary to attach and detach the horizontal cylinder engine 4 and the jet unit 5 to and from the hull 2 individually, and by attaching and detaching them with good workability, detachability and maintainability are enhanced.

In the power unit 3, since the crankshaft 16 of the horizontally opposed engine 4 and the impeller shaft 26 of the jet unit 5 are coaxially connected directly on the base plate 40, the power unit 3 is mounted on the hull 2. The centering of the crankshaft 16 and the impeller shaft 26 becomes unnecessary, and the crankshaft 16 is not affected by the manufacturing accuracy of the hull 2.
And the coaxiality of the impeller shaft 26 can always be maintained with high accuracy.

By the way, in the surfboard 1 according to the present embodiment, the occupant gets on and off from the rear part of the hull 2, but in the present embodiment, the horizontal cylinder engine 4 is used as a drive source of the power unit 3, so that the hull 2 Not only is the height of the rear part kept low, it is easy to get on and off the surfboard 1 from the rear part of the hull 2 and the getting on and off property is improved,
The upper surface is kept low over the entire length of the hull 2 and can be flattened, so that the occupant can take a free riding position. In particular, since the power unit 3 is arranged at the rear part of the hull 2, the height of the hull 2 near the center in the front-rear direction, where the occupants often stand, can be kept low. And controllability is improved. At the same time, the engine vibration is suppressed to a low level, and the occupant's discomfort is eliminated. Since the power unit 3 includes the horizontal cylinder engine 4, the engine vibration is suppressed to be low, and the occupant's discomfort is eliminated.

In the surfboard 1 according to the present embodiment, since the power unit 3, which is a heavy object, is disposed at the rear portion of the hull 2, the turning radius of the surfboard 1 is reduced and the turning performance is improved. .

Here, FIG. 6 shows a use form of the surfboard 1. As shown in FIG. 6, an occupant stands on the floor deck 2a of the hull 2 of the surfboard 1 and operates the wireless remote control device (RC) 43. By controlling the driving of the engine 4 and shifting the weight, it is possible to glide on the water while adjusting the glide speed, the turning direction and the like.

When a start button (not shown) is operated by the wireless remote controller 43, the starter motor 9 is driven to start the horizontal cylinder engine 4, and the horizontal cylinder engine 4 is generated in the intake stroke of each cylinder 17. The air is drawn into the intake pipe 7 from the air intake 6 by the negative pressure. In the air intake section 6,
The moisture contained in the air is temporarily removed, and only the air from which the moisture has been primarily removed is introduced into the intake pipe 7.

The air introduced into the intake pipe 7 branches right and left from the intake chamber 12, passes through the first left and right ducts 13, is introduced into the air separator 11, and is introduced into the air separator 11. After the water is removed, the carburetor 22 passes through the second intake duct.
It is led to. The water separated from the air in the air separator 11 is discharged from the air separator to the outside of the hull 2 through the left and right drain pipes 15.

Meanwhile, in the carburetor 22, an air-fuel mixture is formed by mixing air and fuel, and this air-fuel mixture passes through a reed valve (not shown) and is supplied to the horizontal cylinder engine 4.
Of the crankcase 2
After being primarily compressed in the crank chamber of the cylinder 1, it is supplied to each cylinder 17 for combustion.

Exhaust gas generated by the combustion of the air-fuel mixture passes through an exhaust pipe 35 shown in FIG.
6 and is discharged into the water from an exhaust port 36a at the rear of the hull 2 (see FIGS. 4 and 5).

The horizontal cylinder engine 4 is continuously operated by repeating the above operation. The rotation of the crankshaft 16 of the engine 4 causes the impeller shaft 26 of the jet unit 5 and the impeller attached thereto to rotate. The rotation of the impeller 27 causes the water sucked from the suction port 44 (see FIG. 3) to be jetted rearward from the nozzle 29 by the rotation of the impeller 27.
The surfboard 1 slides on the water by the thrust generated by the jet of water backward. In this case, the turning of the surfboard 1 left and right is performed by a change in the posture of the occupant on the hull 2.

Note that a wire handle may be attached to the front of the hull 2 instead of the wireless remote control device 43, and the surfboard 1 may be steered by operating the wire handle.

7 and 8 show another mode of use of the surfboard 1. In the examples shown in these figures, the handle post 31 can be swung back and forth on the front upper surface of the hull 2 of the surfboard 1. FIG. And the handle post 31
The handle post 31 can be held at a predetermined position by fixing the lower ends of the left and right stays 34 pivotally supported in the middle to the hull 2. And
A head 32 is fixed to the upper end of the handle post 31, and an L-shaped bar handle 33 is fixed to the head 32. The head 32 is supported on the upper end of the handle post 31 so as to be rotatable and fixable about an axis in the front-rear direction, and the direction of the bar handle 33 can be fixed left and right in accordance with the preference of the occupant ( (See FIG. 9).

At the time of turning, the occupant moves the weight by holding the bent portion 33a extending in the front-rear direction to the right of the bar handle 33 with both hands as shown in FIG. 7, or as shown in FIG. 33 left and right 33a, 33b
The surfboard 1 can be turned in an arbitrary direction by performing weight shift with the hand. In addition, in the case of going straight, any holding method may be selected.

When the surfboard 1 is transported after use, the surfboard 1 can be easily transported with good workability by folding the handle post 31, the bar handle 33 and the stay 34 as shown in FIG. , Its transportability is enhanced.

[0035]

As is apparent from the above description, according to the present invention, a horizontal cylinder engine having a crankshaft arranged in the longitudinal direction of a hull, and coaxially connected to the crankshaft of the horizontal cylinder engine. The surfboard with engine is constructed by arranging the jet unit with the impeller shaft and the surfboard with the engine at the rear of the hull, so that the surfboard with the engine has high turning performance, while keeping the height of the rear of the hull low and getting on and off. And the flat surface can be kept low over the entire length of the hull, so that the occupant can take a free riding position and the engine vibration can be kept low. Is obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a surfboard with an engine according to the present invention.

FIG. 2 is a plan view of a surfboard with an engine according to the present invention.

FIG. 3 is a side sectional view of a power unit portion of a surfboard with an engine according to the present invention.

FIG. 4 is a plan sectional view of a power unit portion of the surfboard with an engine according to the present invention.

FIG. 5 is a perspective view showing how to attach a power unit to a hull in a surfboard with an engine according to the present invention.

FIG. 6 is a perspective view showing a use form of the surfboard with an engine according to the present invention.

FIG. 7 is a perspective view showing another use mode of the surfboard with the engine according to the present invention.

FIG. 8 is a perspective view showing another use form of the surfboard with an engine according to the present invention.

FIG. 9 is a perspective view showing a state in which the surfboard with an engine according to the present invention is being transported.

[Explanation of symbols]

 Reference Signs List 1 surfboard with engine 2 hull 3 power unit 4 horizontal cylinder engine 5 jet unit 16 crankshaft 26 impeller shaft 33 bar handle

Claims (2)

[Claims] 1. A horizontal cylinder engine having a crankshaft arranged in the front-rear direction of a hull, and a jet unit having an impeller shaft coaxially connected to the crankshaft of the horizontal cylinder engine are provided in a rear part of the hull. A surfboard with an engine that is arranged and configured. 2. The surfboard with an engine according to claim 1, wherein a bar handle is provided upright on an upper surface of a front portion of the hull.