JPH0585471A - Small-sized hydrovehicle - Google Patents

Abstract

PURPOSE:To prevent atmosphere pollution and realize miniaturization and a light weight in the case of a small-sized hydrovehicle such as a jet propulsion type water ski by making the prime mover of an impeller an electric motor, utilizing part of high pressure water for jet to cool the electric motor and the heating portion of an electric system. CONSTITUTION:An electric motor 8 is installed at a ship bottom portion, and an output shaft 9 is provided extendingly toward the rear, and a pump 11 having an impeller 10 is connected to the rear end, and is driven by means of the motor 8. By the drive of the pump 11, water is sucked from the ship bottom through a jet water passage 12 and made high pressure water, and a jet propulsion boat advances by conducting jetting toward the rear at a high speed through a ship nozzle 15. Also, a cooling water circulation portion 21 like a water jacket is provided at the outer periphery of the motor 8, and also a similar cooling water circulation portion 22 is provided at the outer periphery of a control unit 20. And, a cooling water pipe 23 is branched off from the discharge side of the pump 11, and part of high pressure water is made to become cooling water and supplied to cooling water circulation portions 21, 22, and the motor 8 and the control unit 20 are cooled. Cooling water is discharged through discharge openings 24a,24d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small water vehicle for propelling high-pressure water obtained by suctioning and pressurizing surrounding water from a stern nozzle toward the rear to travel over water.

[0002]

2. Description of the Related Art For example, Japanese Patent Publication No. Sho 53-3879 discloses such a small water vehicle (jet propulsion type water ski). This small water vehicle (hereinafter referred to as a jet propulsion boat) has a hollow hull. An engine (internal combustion engine) and a jet propulsion device driven by the engine are installed on the inner bottom of the engine, the nozzle of the propulsion device is opened rearward of the hull, and a handle for operating the nozzle is arranged on the upper part of the hull. The inside of the hull in which the engine is installed communicates with the outside air through an air intake pipe, and engine air is supplied from here to the inside of the hull. Engine exhaust,
It is discharged into the water through an exhaust pipe extending from the engine in the front and rear direction inside the hull.

Although the jet propulsion boat is not provided with a reverse drive device, it is swung to the rear position of the nozzle to block the jet flow from the nozzle and direct the jet flow obliquely forward (bucket).
There is also a thing that made it possible to reverse.

[0004]

A conventional jet propulsion watercraft uses an engine (internal combustion engine) as a propulsion main engine as described above, but has the following improvements.

In the conventional jet propulsion watercraft, cooling water must be injected into the exhaust system in order to prevent overheating of the exhaust system of the engine and to lower the temperature of the exhaust gas. It is difficult to install a catalyst for exhaust gas purification, which makes exhaust gas countermeasures difficult.

Inside the hull (engine room) in which the engine is installed, the intake port for taking in the combustion air as described above must be provided, and the exhaust port for exhausting and exhausting the gasoline vapor in the room must be provided. Therefore, when the waves are high, water may enter from the intake / exhaust port, causing troubles to the engine and electrical components.If water with more than the bilge drainage capacity invades, a large amount of water will accumulate at the bottom of the ship, It will be in a state, it will be heavy and it will be difficult to planing on the water, or it will be difficult to balance due to the fluctuation of the free water surface in the ship.

Further, since the backward device using the jet shield is complicated in structure and it is difficult to make its strength strong enough to withstand the maximum thrust, it can be used only at low thrust, and therefore at the time of high speed propulsion. It cannot be used as a speed reducer to reduce boat speed.

The present invention intends to solve the above problems and to provide a jet propulsion watercraft which is further improved.

[0009]

That is, according to the present invention, external water is pressurized by an impeller driven by a prime mover provided in a hull to generate high pressure water, and the high pressure water is jetted from a stern nozzle. In the first aspect of the present invention, the prime mover is an electric motor, and a part of the high-pressure water is guided to the electric motor and a heat-generating portion of an electric system associated therewith to cool them. ..

According to the present invention, since the electric motor is used as the prime mover, the exhaust gas does not pollute the atmosphere or water. Moreover, since the heat-generating portion of the electric motor or the like is cooled by using high-pressure water for propulsion, the structure can be simplified, and the size, weight and cost can be reduced.

In the second aspect of the present invention, the prime mover is an electric motor, the electric motor can be rotated in the forward and reverse directions, and a forward / reverse control operation member is provided near the cockpit of the ship.

According to the present invention, by reversing the electric motor, water can be sucked in from the stern nozzle side and ejected forward to carry out the backward movement, and the jet flow shielding plate as described above is required for the backward movement. Since it does not, the structure is simplified, and the number of failures is reduced. Further, the boat speed can be reduced easily and effectively by reversing the electric motor during the cruising. Further, since the forward / reverse rotation control operation member is provided in the vicinity of the pilot seat on the ship, the operator can perform the reverse or deceleration operation without disturbing the boarding posture, and the operability is improved.

In the third aspect of the present invention, the prime mover is an electric motor, and a plurality of batteries serving as a power source of the electric motor are appropriately connected to form a plurality of power supply systems, and one of these power supply systems is selected. A changeover switch will be installed near the pilot's seat on the ship.

According to the present invention, the operation is performed using one of a plurality of divided power supply systems, and when the power supply of the system is exhausted, it is necessary to switch to another system. It is possible to make the driver surely recognize the remaining power amount. Further, since the capacity distribution of each power supply system can be freely changed, it is also possible to make the capacity of one power supply system comparatively small and allow this as a spare power supply. Since the changeover switch for selecting the power supply system is provided in the vicinity of the pilot seat on the boat, the operator can perform the switching operation without disturbing the boarding posture, and the operability is improved.

In the fourth aspect of the present invention, the prime mover is an electric motor, and the engine room for accommodating the electric motor and accessories is of a hermetically sealed structure.

According to the present invention, it is possible to prevent water or seawater from entering the engine room, prevent problems due to water from the main engine (electric motor) and auxiliary machines, and improve reliability. In addition, the bilge system can be abolished and the weight and cost can be reduced. Furthermore, the extra space can be used for a storage case or a buoyancy body, and can have a larger preliminary buoyancy.

In a fifth aspect of the present invention, the prime mover is an electric motor, and an on / off switch that closes a drive circuit of the electric motor when pressed, and an electric motor drive when the drive circuit is opened and closed and closed. An output control operating member for controlling electric power is provided on the steering handle in close proximity to each other.

According to the present invention, since the on / off switch and the output control operating member are provided on the steering handle in close proximity to each other, the operator can operate both with one hand. Then, in order to operate the electric motor, while closing the drive circuit by the on-off switch,
Further, since the same circuit must be closed by the output control operating member, the electric motor will not inadvertently operate when these switches or operating members are inadvertently contacted. On the other hand, in order to stop the electric motor, it is sufficient to open the drive circuit with either the switch or the operating member, so that the electric motor can be stopped quickly and surely when necessary, and the operator can be stopped for some reason. When the hand is released from the handle, the pressing force applied to the on-off switch is released, so that the switch opens the drive circuit and the electric motor immediately stops. As described above, according to the present invention, the malfunction of the electric motor can be prevented and the reliability can be improved.

In the sixth aspect of the present invention, the prime mover is an electric motor, and the installation position of a battery serving as a power source of the electric motor is variable.

Since the battery has a sufficient weight and the weight hardly changes due to charging and discharging, the position of the center of gravity of the boat as a whole can be adjusted by changing the installation position of the battery in the boat. Therefore, for example, the position of the battery can be changed according to the number of passengers or the weight of the passengers to ensure the best position of the center of gravity, and stable steering characteristics can always be obtained.

In the seventh aspect of the present invention, the prime mover is an electric motor, and the structure of the water portion is such that the buoyancy of one of the left and right halves is greater than the buoyancy of the other half when it is submerged in water. Asymmetric.

According to the present invention, when the boat capsizes, the metacenter and the center of gravity shift to the left and right, and a rotational moment is generated in a direction to restore the hull, so that the hull can be easily pulled up. Also, the rotation moment can be increased to enable automatic restoration.

In the eighth aspect of the present invention, the prime mover is an electric motor, and an audible alarm device activation switch is provided at a position adjacent to the grip portion of the steering handle.

At sea, it is obligatory to hold an acoustic alarm device as a horn during heavy fog, and in jet propulsion boats, the operator generally puts the whistle in a pocket of a life jacket. However, it is virtually impossible to take out the whistle that has been stored in a pocket or the like and quickly issue an alarm to call attention. According to the present invention, an alarm can be rapidly issued by operating the operation switch, and since the operation can be performed without releasing the hand from the handle, it does not hinder the operation.

According to a ninth aspect of the present invention, a deflector plate which can be opened forward and downward is provided at the bottom of the bottom of the small water vehicle according to the second aspect of the present invention, and the deflector plate is provided with the forward / reverse control operation member. So that the deflector plate opens when the operating member is set to the electric motor reverse position.

According to the present invention, when the forward / reverse rotation control operating member is operated to the reverse rotation position, the flow diverter is opened in association with this operation,
A water flow in a rearward and upward direction is generated by the drift plate, whereby the hull changes trim and the stern sinks in the water. As a result, the resistance of the boat itself increases, and the boat rapidly decelerates in combination with the interruption of the jet jet due to the reverse rotation of the impeller. Since the deflector plate only deflects the water flow, and the resistance for deceleration is provided by the entire boat, the deflector plate and the mechanism for operating it are not required to be particularly strong, and therefore they are relatively small, It can be lightweight.

Since the second to ninth inventions each use an electric motor as a prime mover,
Similarly to the invention of 1, the pollution of the air or water can be prevented.

[0028]

EXAMPLE FIG. 1 is a side view of a small water vehicle, that is, a jet propulsion boat 1 according to an embodiment of the present invention, and FIG. 2 is a rear view thereof.

Reference numeral 2 denotes a hull, which is formed in a slender shape in the front-rear direction and smoothly rises toward the front end, and a horizontal deck 2
A port side portion 2c having a b and protruding upward from the deck 2b is provided along both the left and right sides. The hull 2 is in the form of a closed hollow box as a whole, and has a sufficient buoyancy for water by itself.

The front part on the deck 2b is covered with a surrounding area 3
A hollow floating body 4 that is watertightly sealed is provided, and the floating body 4 further imparts buoyancy to the jet propulsion watercraft 1. On the deck 2b behind the floating body portion 4, a seat 5 extending in the front-rear direction is provided in the central portion in the left-right direction in contact with the rear surface of the floating body portion 4. Further, a handle cover 6 is provided at the center of the upper surface of the floating body 4, and handles 7 project from the cover 6 to the left and right respectively. The seat 5 is 2
For passengers, two passengers can sit side by side on the seat 5 side by side, and a passenger in front operates the boat by the handle 7.

An electric motor 8 is installed inside the hull 2 at the bottom of the ship, and a pump 11 having an impeller 10 driven by the shaft is provided at the rear end of an output shaft 9 extending rearward from the electric motor 8. The pump 11 is arranged in a jet water channel 12 that passes from the bottom to the stern of the hull 2 at the lower rear portion thereof. A recess 14 surrounded by a partition wall 13 is formed in the lower center of the rear surface of the hull 2 (Fig. 2), and the jet water channel 12 penetrates through the front wall portion of the partition wall 13 to face the recess 14 and A stern nozzle 15 is provided at the tip. When the impeller 10 is rotationally driven in the forward direction by the electric motor 8, the jet water channel
The water sucked from the bottom of the ship through 12 is pressurized to generate high-pressure water, and this high-pressure water is jetted from the stern nozzle 15 at high speed into the rear water, and as a reaction, the jet propulsion boat 1
Moves forward.

A steering nozzle 17 is provided behind the stern nozzle 15 via a hinge pin 16 so that the steering nozzle 17 can be deflected to the left and right.
By deflecting the steering nozzle 17 and changing the direction of the jet flow, the traveling direction of the jet propulsion watercraft 1 can be changed. The deflection operation of the steering nozzle 17 is performed by the handle 7 via the steering cable 18 connected to the hinge pin 16.

In the hull 2, a control unit which also contains a battery 19 as a power source of the electric motor 8 and a circuit or an electric component for controlling the electric power supply from the battery 19 to the electric motor 8
20 are installed. A cooling water circulating portion 21 such as a water jacket is provided on the outer periphery of the electric motor 8, and the battery 19 and the control unit 20 are also collectively surrounded by the same cooling water circulating portion 22. The cooling water pipe 23 led out from the discharge side of the pump 11 is connected to the cooling water circulation parts 21 and 22 via branch pipes 23a and 23b.
Part of the high-pressure water generated by 10 is sent to the cooling water flow sections 21 and 22, and cools the electric motor 8, the battery 19, and the control unit 20. The water that has cooled these is discharged to the discharge path 24a,
It is discharged to the outside of the ship via 24b.

The cooling system for the electric motor 8 and the like in FIG. 1 is a direct cooling system using the water discharged from the pump 11, but it may be an indirect cooling system as shown in FIG.
In FIG. 3, a circulation pump 25 is directly connected to the electric motor 8, and a cooling water circulation pipe 26 (26a, 26b, 26c, 26) that connects the circulation pump 25 and the cooling water circulation portions 21, 22 in series.
d) is provided. Then, the high-pressure water taken out from the pump 11 by the cooling water pipe 23 is discharged to the outside of the ship via the heat exchanger 27, and the water from the cooling water pipe 23 and the circulating water flowing through the cooling water circulation pipe 26 in the heat exchanger 27. Heat exchange takes place between and.

A forward / reverse control lever 28 is provided on a side surface of the floating body 4 near the seat 5, and the lever 28 is provided.
By operating, the control circuit in the control unit 20 can be switched to rotate the electric motor 8 in the forward rotation direction or the reverse rotation direction. That is, when the forward / reverse control lever 28 is tilted from the illustrated neutral position N to the forward position F, the electric motor 8 rotates in the normal direction, and high-pressure water is jetted backward by the impeller 10, so that the jet propulsion boat 1 advances. When the lever 28 is tilted to the rear position R, the electric motor 8 is rotated in the reverse direction, and the impeller 10 sucks water from the rear and discharges the water to the front.

Therefore, since the jet flow shielding plate is not required for the backward movement, the structure is simple and the breakdown is reduced. In addition, by reversing the electric motor 8 during cruising,
The boat speed can be reduced easily and effectively. Further, since the forward / reverse control lever 28 is provided near the seat 5, that is, the cockpit, the operator can perform the reverse or deceleration operation without disturbing the boarding posture, and the operability is improved.

The power source of the electric motor 8 is a large number of batteries 19, 19.
.. is divided into a plurality of groups, and each group is connected to form a plurality of power supply systems. FIG. 4 shows an example thereof. In this example, three 12V, 50A batteries 19 are connected in series to provide a 36V, 50A power source.
Such an independent power supply system is formed into three systems A, B, and C. Any one of these power supply systems A, B, C is connected to the electric motor drive circuit in the control unit 20 by the changeover switch 29 (FIG. 5). As shown in FIGS. 1 and 2, the changeover switch 29 is provided on the rear surface of the floating portion 4 so as to face the seat 5.

The operator selects one of the power supply systems A, B, and C by the changeover switch 29 and connects it to the electric motor 8, operates by this power supply system, and when the power supply of that system is exhausted, the other system is operated. Since it has to be switched to, it is possible to make the operator surely recognize the remaining power amount by this switching action. As described above, the change-over switch 29 is provided near the seat 5 so as to face it, so that the operator can easily perform the change-over operation without losing the riding attitude.

A residual capacity measuring load 30 is connected to the control unit 20, the residual capacity (remaining electric energy) of the connected power supply system is measured in the control unit 20, and the measurement result is displayed on the display 31. Is output. On the display 31, as shown in FIG. 6, the currently connected power supply system (group), the remaining capacity, the cruising range, the available time, etc. are displayed. As shown in FIG. 2, the display 31 is provided in the center of the rear surface of the floating body 4, so that the operator can clearly know the remaining capacity.

FIG. 7 shows another configuration example of the power supply system. In this example, two 12V, 50A batteries 19 are connected in series, and a 24V, 100A power supply system A is connected in two rows in parallel, and only two similar batteries 19 are connected in series.
A power supply system B of 24V and 50A is formed, and the capacity ratio of both power supply systems A and B is set to 2: 1. The system A is used as a main power system that is always used, and the system B is used as a spare to allow a margin.

The inside of the hull 2 constitutes an engine room 32 in which an electric motor 8 which is a prime mover and a battery 19 and a control unit 20 which are attached to the electric motor 8 are stored. However, since the prime mover is an electric motor, this engine room is provided. Does not require an opening for introducing combustion air or ventilation, and the electric motor 8 and the like are forcibly cooled by cooling water, so that the engine room 32 has a closed structure. .. Therefore, there is no risk that seawater or the like will enter the engine room 32 and the electric motor 8 and auxiliary machines will be flooded with water, and the bilge system will be abolished to reduce the weight and cost, and to save the extra space. It can be used as a buoyancy body.

FIG. 8 is a rear view of the handle 7. An on-off switch 33 is provided on the grip 7a of the right handle 7. The on / off switch 33 is connected to the electric motor drive circuit opening / closing means in the control unit 20, and when the switch 33 is turned on, the opening / closing means closes the drive circuit. However, the lever 33 is turned on by being pressed. Therefore, the operator can grip the grip 7a.
When is gripped with the switch 33, the switch 33 is turned on and the electric motor drive circuit is closed.

An output control lever 34 is arranged near the on-off switch 33 along the grip 7a. The output control lever 34 is an operating member of a potentiometer 36 fixed to the handle 7 and covered with a waterproof cover 35. A signal corresponding to the rotation angle of the lever 34 is sent from the potentiometer 36 to the output control section of the electric motor drive circuit. Be done.
Then, the electric power supplied to the electric motor 8 is adjusted according to the signal, and the rotation speed of the electric motor 8 is controlled. However, lever 34
9 is in the rotation angle range shown as “OFF” in FIG. 9, the output control unit keeps the drive circuit in the open state and shuts off the power supply to the electric motor 8. Lever 34 is "OFF"
When the electric power is supplied to the electric motor 8 when the electric power is supplied to the electric motor 8 beyond the area and the electric power is adjusted according to the rotation angle of the lever 34, the lever 34 is moved from the L position to the H position in FIG. The rotation speed of the electric motor 8 gradually increases as the process proceeds to.

In this way, to operate the electric motor 8,
It is necessary to press the on-off switch 33 to turn it on and to rotate the output control lever 34 until it exceeds the "OFF" range.
Since the 33 and the output control lever 34 are provided close to each other on the grip 7a, the operator can easily perform this operation with one hand. However, even if one of the on-off switch 33 and the output control lever 34 is inadvertently contacted to turn it on when the motor is stopped, the motor 8 does not operate.

On the other hand, in order to stop the electric motor 8, the drive circuit may be opened by either the on-off switch 33 or the output control lever 34, so that the electric motor 8 can be stopped quickly and surely when necessary. For example, when the operator releases the grip 7a due to falling water, the pressing force applied to the on-off switch 33 is released, so that the switch is turned off and the electric motor 8 is immediately stopped.

The handle 7 on the left side is provided with a push button type alarm switch 37 adjacent to the grip 7b. The alarm switch 37 is connected to an audible alarm device such as a horn (not shown) on the boat. When the alarm switch 37 is pressed, the alarm device is activated to generate an alarm sound. This is used in the case of heavy fog, etc., but the operator can quickly issue an alarm by pressing the alarm switch 37 with his fingertips without releasing the grip 7b.

As shown in FIGS. 1 and 2, a deceleration deflector 38 is provided at the center of the rear end of the bottom of the hull 2 below the stern nozzle 15 and the steering nozzle 17. The flow diverter 38 is enlarged and shown in more detail in FIGS. FIG. 10 is a vertical cross-sectional view showing the state of the deflector 38 during normal traveling, FIG. 11 is a plan view thereof, and FIG. 12 is a side view of the main parts showing the state of the deflector 38 during deceleration.

The deflector 38 has a rear end pivotally supported by the rear wall 2b of the hull 2 via a pivot 39 and can be opened forward and downward, and a hull in front of the deflector 40. The fixed plate 42 is fixed to the bottom wall of No. 2 and has two left and right cutouts 41 that are open rearward, and a movable plate 43 that is disposed in each cutout 41 and extends in the front-rear direction. There is.
A rear end of the movable plate 43 is rotatably supported by a front edge of the drift plate 40 via a pivot 44, and a front end thereof is supported by a fixed plate 42 via a pivot 45. Guide grooves 46, 46 extending in the front-rear direction are provided in the front portion on the outer wall surfaces of the left and right cutouts 41, 41, and both ends of the pivot 45 extend into the guide grooves 46. It is supported by. A similar guide groove 46 'is also provided in the fixed plate portion between the left and right cutouts 41, 41, so that the pivot 45 can move in parallel with the fixed plate 42 in the front-rear direction.

The deflector plate 40 is biased downward by a spring 47 provided between the deflector plate 40 and the rear wall 2b of the hull 2, but normally the actuating cable 49 is connected via a hook member 48 connected to the front end portion. It hangs up and occupies the horizontal position shown in FIG. In this state, the pivot 45 slides to the front end position of the guide groove 46, so that the movable plate 43 also becomes horizontal. Thus, during normal sailing, the deflector plate 40, the fixed plate 42, and the movable plate 43 are flush with the bottom of the hull 2 and do not protrude from them, which may impede propulsion or prevent obstacles from overcoming obstacles. There is no such thing.

The hook member 48 is provided with an elongated hole 50 extending in the axial direction thereof, and the end portion of the operating cable 49 is engaged with the elongated hole 50 so as to be slidable in the axial direction. Actuation cable
49 extends inside the sheath pipe 51 disposed inside the hull 2, and the other end is
It is connected to a control arm 52 which is interlocked with the forward / reverse control lever 28 via a clutch mechanism 53. The control arm 52 maintains the same position N'when the forward / reverse control lever 28 is in the neutral position N and the forward position F, but the forward / reverse control lever 28
When the shifts from the neutral position N to the reverse rotation position R, it rotates to the deceleration position R 'accordingly.

When the control arm 52 rotates to the decelerating position R ', the actuation cable 49 causes the hook plate 48 to move the deflector plate.
Since the lifting force applied to 40 is released, the flow deflector plate 40 is pushed down by the force of the spring 47 and opens downward as shown in FIG. At this time, the movable plate 43 is pivoted 45
Is slid to the rear end position of the guide groove 46 to follow the movement of the flow diverter plate 40 and occupy the inclined position shown in the figure to hold the flow diverter plate 40 at a predetermined opening.

As a result, due to the deflector plate 40 projecting downward and forward from the bottom of the ship, a diagonally upward water flow (biased flow) is generated at the stern as indicated by the arrow a in FIG. As shown in 13, the stern sinks, increasing the resistance of the boat itself. Moreover, at this time, since the forward / reverse control lever 28 is set to the reverse position R, the jet propulsion boat 1 is rapidly decelerated in combination with the interruption of the jet jet flow due to the reverse rotation of the impeller 10. Even when the boat is in the planing state, the stern will sink rapidly, so deceleration is effectively performed. The deflector plate 40 only deflects the water flow, and the resistance for deceleration is provided by the entire boat, so the deflector plate 40
And the mechanism for operating it is not required to be particularly strong, so that they can be relatively small and lightweight.

Since the operating cable 49 is slidably engaged with the hook member 48 through the elongated hole 50 in the axial direction, the deflecting plate 40 or the movable plate 43 projecting from the bottom of the ship has a force greater than the force of the spring 47. When the upward force is applied, the deflector plate 40 can freely move up. Therefore, when decelerating or moving backward,
Alternatively, even if the movable plate 43 comes into contact with an obstacle, it is possible to avoid the obstacle by ascending.

Reference numeral 54 is a spray-up prevention plate integrally fixed to the bottom of the hull 2, which is used as a drift plate 40 and a fixed plate during normal traveling.
The gap generated between the movable plate 43 and the movable plate 43 is covered from above, and the flow of water that enters the recess 14 (FIG. 2) from the gap is blocked to prevent splashes from the stern or to improve the jet flow efficiency. Prevent it from falling.

FIG. 14 is an overall schematic view of a jet propulsion boat 1 showing another embodiment of the present invention. In the present embodiment, the installation position of the battery 19 inside the hull 2 can be changed. Since the battery has a sufficient weight and the weight hardly changes due to charge / discharge, the position of the center of gravity of the boat as a whole can be adjusted by changing the installation position of the battery 19 in the hull 2. In the present embodiment, as in the case of the previous embodiment, the operator 55 and the passenger 56 can be mounted side by side on the seat 5 which is long in the front-rear direction at the center portion in the left-right direction. When only the pilot 55 is on board as shown by the solid line, the battery 19 is installed at a solid line position near the center in the front-rear direction of the hull 2, and when the passenger 56 is also on board as shown by the dotted line, the battery 19 is installed. Move it to the front dotted position 19 '. In this way, the center of gravity of the boat is always ensured at the best predetermined position.

FIG. 15 shows the battery in the jet propulsion boat 1 in which the pilot 55 and the passenger 56 are seated side by side.
An example in which the installation positions of 19 are variable is shown. In this example, the handle 7 is a round handle and is provided near the port side of the boat. In the case of only the pilot 55, the installation position of the battery 19 is selected on the starboard side as shown by the solid line, and in the case of the two passengers of the pilot 55 and the passenger 56, this battery is located at the central position as shown by the dotted line 19 '. Move to. Conventionally, in such a two-seater left and right type, the operator sits in the center of the boat to balance in the case of one-seater, and to the left or right side in the case of two-seater. Since the user must be seated, the handle position must be moved accordingly, and a complicated handle attaching / detaching mechanism and steering mechanism are required. However, according to the present embodiment, since it is not necessary to change the handle position according to the number of passengers, the above-mentioned mechanisms are simplified.

FIG. 16 shows still another embodiment of the present invention.
The figure is a front view showing the capsized state of the jet propulsion boat 1, and 57 is the water surface. In the present embodiment, a water space 58a that allows water to enter is provided on the left side portion of the floating body 4, and a similar water space 58b is also provided on the left port side portion 2c of the hull 2. The left half of the inside of the handle cover 6 is a water space 58c communicating with the outside. The right half of the handle cover 6 is a completely sealed buoyancy portion. The portions where the water spaces 58a, 58b, 58c are provided are the portions located above the water in the normal state of the jet propulsion boat 1.

In this way, the jet propulsion boat 1 of this embodiment is
In the above, the structure of the above-water part is asymmetrical, and when the part is submerged in water, the volume of water excluded by the left half is smaller than the volume of water excluded by the right half. That is, the buoyancy generated in the left half is smaller than the buoyancy generated in the right half. Therefore, when the jet propulsion boat 1 capsizes as shown in FIG. 16, its metacenter 59 is unevenly distributed on the right side with respect to the vertical centerline 60 of the boat.
On the other hand, since the center of gravity 61 of the boat is on the vertical center line 60, the center of gravity 61
Due to the downward gravity G acting on and the upward buoyancy B acting on the metacenter 59, a rotational moment is generated in a direction to restore the boat, and the hull is easily pulled up. Alternatively, the rotation moment can be increased to enable automatic restoration.

Although the present invention has been described with reference to the jet propulsion watercraft 1 provided with the rod-shaped handle 7 except for the one shown in FIG. 15, the present invention is not limited to the one provided with the rod-shaped handle. Widely applicable to jet propulsion boats with handles of any other shape.

[0060]

Since the small water vehicle of the present invention uses an electric motor as a prime mover, it is possible to prevent pollution of the atmosphere or water due to exhaust gas or the like.

Further, according to the invention of claim 1, since the heat generating portion of the electric motor or the like is cooled by using high-pressure water for propulsion, the structure is simplified, and the size, weight and cost are reduced. You can

According to the second aspect of the invention, the reverse operation is easy, the structure of the reverse device is simplified, and the number of malfunctions is reduced.

According to the third aspect of the invention, it is possible to prevent the power supply from being depleted due to carelessness.

According to the fourth aspect of the present invention, the troubles caused by the main engine and the auxiliary machinery due to being flooded can be prevented, so that the reliability is improved, and the bilge system can be eliminated to reduce the weight and the cost. it can.

According to the invention of claim 5, it is possible to prevent malfunction of the electric motor and improve reliability.

According to the invention of claim 6, the best position of the center of gravity can be secured regardless of the number of passengers or the weight of the passengers.

According to the invention of claim 7, it is easy to raise the hull when it is capsized, and it is possible to automatically restore the hull.

According to the eighth aspect of the invention, acoustic signals to the surroundings in a thick fog or the like, and steering signals when ships perform mutual operations can be swiftly emitted at desired times without delay.

According to the invention of claim 9, it is possible to effectively decelerate a boat running at high speed in a short time, and to make the decelerator relatively small and lightweight.

[Brief description of drawings]

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

FIG. 2 is a rear view of the jet propulsion boat.

FIG. 3 is a diagram showing another example of a cooling system for an electric motor and the like.

FIG. 4 is a diagram showing an example of connection between batteries.

FIG. 5 is a circuit diagram showing a connection of a power supply system to a control unit.

FIG. 6 is a view showing a display surface of a display.

FIG. 7 is a diagram showing another example of connection between batteries.

FIG. 8 is a rear view of the handle.

FIG. 9 is a view showing an output control operation member provided on a handle.

FIG. 10 is a vertical cross-sectional view showing a state of the drift device during normal traveling.

FIG. 11 is a plan view of the same.

FIG. 12 is a side view showing a state of the deflector at the time of deceleration.

FIG. 13 is a perspective view showing a state of the jet propulsion watercraft during deceleration.

FIG. 14 is a schematic side view for explaining a jet propulsion watercraft according to another embodiment of the present invention.

FIG. 15 is a schematic front view for explaining a jet propulsion watercraft according to another embodiment of the present invention.

FIG. 16 is a front view showing a state of a jet propulsion boat according to a further embodiment of the present invention when the jet propulsion boat is capsized.

[Explanation of symbols]

1 ... Jet propulsion boat, 2 ... Hull, 3 ... Cover, 4 ... Floating body part, 5 ... Seat, 6 ... Handle cover, 7 ... Handle, 8
… Electric motor, 9… Output shaft, 10… Impeller, 11… Pump, 12
... Jet water channel, 13 ... Bulkhead, 14 ... Recess, 15 ... Stern nozzle, 16 ... Hinge pin, 17 ... Steering nozzle, 18 ... Steering cable, 19 ... Battery, 20 ... Control unit, 21, 22 ... Cooling water distribution section, 23 ... Cooling water pipe, 24 ... Discharge passage, 25 ... Circulation pump, 26 ... Cooling water circulation pipe, 27 ... Heat exchanger, 28 ... Forward / reverse control lever, 29 ... Changeover switch, 30 ... Remaining capacity measuring load, 31 ... Display, 32 ... Engine room, 33 ... On-off switch, 34 ... Output control lever, 35 ... Waterproof cover, 36 ... Potentiometer, 37 ... Alarm switch, 38 ... Drift device, 39
... Axis, 40 ... Drift plate, 41 ... Notch, 42 ... Fixed plate, 43 ... Movable plate, 44, 45 ... Axis, 46 ... Guide groove, 47 ... Spring, 48 ... Hook member, 49 ... Actuating cable, 50 … Slots, 51… Sheath tubes, 52
... Control arm, 53 ... Clutch mechanism, 54 ... Spray-up prevention plate, 55 ... Pilot, 56 ... Passenger, 57 ... Water surface, 58 ... Water space, 59 ... Metacenter, 60 ... Vertical center line, 61 ... Center of gravity.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B63H 21/38 Z 9035-3D

Claims (9)

[Claims] 1. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high pressure water, and the high pressure water is jetted from a stern nozzle to propel the water. Is a motor, and a part of the high-pressure water is guided to the heat generating part of the electric motor and an electric system associated therewith to cool them. 2. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high-pressure water, and the high-pressure water is jetted from a stern nozzle to propel the water. Is a motor, and the motor is capable of forward and reverse rotations, and a forward and reverse rotation control operation member is provided in the vicinity of the cockpit of a ship. 3. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high-pressure water, and the high-pressure water is jetted from a stern nozzle to propel the water. Is a motor, and a plurality of batteries serving as a power source of the motor are appropriately connected to form a plurality of power systems, and a changeover switch for selecting one of these power systems is provided near the cockpit of the ship. A characteristic small water vehicle. 4. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high pressure water, and the high pressure water is jetted from a stern nozzle to propel the water. Is a motor, and the engine room for accommodating the motor and accessories is hermetically sealed. 5. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high-pressure water, and the high-pressure water is jetted from a stern nozzle to propel the water. Is an electric motor, and an on-off switch that closes the drive circuit of the electric motor when pressed, and an output control operation member that controls the electric power for driving the electric motor when the drive circuit is opened and closed and closed. A small water vehicle characterized by being provided close to each other on a steering handle. 6. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high-pressure water, and the high-pressure water is jetted from a stern nozzle to propel the water. A small water vehicle characterized in that the installation position of a battery serving as a power source of the electric motor is variable. 7. A small water vehicle in which high-pressure water is generated by pressurizing external water by an impeller driven by a prime mover provided inside a hull, and the high-pressure water is jetted from a stern nozzle to propel the water. Is a motor, and the structure of the water surface is asymmetrical so that the buoyancy of one of the left and right halves is greater than the buoyancy of the other half when submerged in water. 8. A small water vehicle in which external water is pressurized by an impeller driven by a prime mover provided inside the hull to generate high-pressure water, and the high-pressure water is jetted from a stern nozzle to propel the water. A small water vehicle characterized by using an electric motor and an audible alarm device activation switch provided at a position adjacent to the grip of the steering handle. 9. A deflector plate that can be opened forward and downward is provided at the tail of the bottom of the ship, and the deflector plate is interlocked with the forward / reverse control operation member, and when the operation member is set to the electric motor reverse position, The small water vehicle according to claim 2, wherein the drift plate is opened.