JPH0687488A - Fuel tank for water jet propulsion boat - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the amount of fuel that can be run for a long time, to reduce changes in trim and rolling of the hull, and not to require skill in maneuvering. [Composition] A jet propulsion device 3 having a water inlet on the bottom of the ship and generating a propulsive force by injecting water to the rear of the stern.
In the normal fuel tank 6 and the normal fuel tank 2 for the engine 2 of the jet propulsion machine 3, the operation handle 4 is provided on the ship in a substantially central portion of the hull and a driver's seat is formed on the rear side thereof. The auxiliary fuel tank 7 used when the amount of the fuel becomes less than a certain amount is arranged on the center line of the hull.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank of a water jet propulsion watercraft which is equipped with a jet propulsion machine and has an operating handle provided on the ship in a substantially central portion of the hull.

[0002]

2. Description of the Related Art Recently, a water jet propulsion boat which is equipped with a jet propulsion machine for one or two passengers and travels at high speed on the sea has been widely used. This water jet propulsion boat is provided with an operating handle at approximately the center of the ship, and a driver's seat is provided at the rear side of the water jet propulsion boat, and water is sucked by a jet propulsion machine from a water inlet formed on the bottom of the ship. , Propulsion is generated by injecting water in a predetermined direction behind the stern,
Glide and turn at high speed on the surface of the water.

[0003]

In the jet propulsion boat having the above-mentioned structure, it has recently been desired to increase the amount of fuel to be loaded due to the demand for larger horsepower and the demand for traveling to a distance or a long time. However, if the fuel tank is enlarged,
Various problems will occur in small vessels. That is, when the fuel tank becomes larger, the weight of that part changes significantly between the full tank state and the empty tank state. Skill is required. On the other hand, it is conceivable to increase the width of the fuel tank in order to increase the capacity of the fuel tank while suppressing the trim change, but in this case, the fuel in the fuel tank moves largely left and right, causing rolling of the hull. There is a problem that it becomes easier to do.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and makes it possible to travel to a long distance or a long time by increasing the loading amount of fuel, and to change the trim of the hull. Another object of the present invention is to provide a fuel tank for a water jet propulsion boat, which has less rolling and requires less skill for maneuvering.

[0005]

According to the present invention, there is provided a jet propulsion machine which has a water inlet at the bottom of the ship and generates a propulsive force by injecting water to the rear of the stern. Is provided with an operation handle and a driver's seat is formed on the rear side thereof, and at least two fuel tanks for the engine of the jet propulsion machine are installed, and one of them is a regular fuel tank that is in constant communication with the engine. Others, however, constitute a backup fuel tank used when the fuel in the regular fuel tank falls below a certain amount.

All of the above fuel tanks are preferably arranged on a center line extending in the longitudinal direction of the hull. Further, the service fuel tank may be constructed to have a larger capacity than the backup fuel tank, and the service fuel tank may be installed at a position closer to the center of gravity of the hull than the backup fuel tank. Further, the engine may be arranged substantially at the center of the hull in the longitudinal direction, and the regular fuel tank and the auxiliary fuel tank may be arranged so as to be distributed to the front side and the rear side of the engine. Furthermore, the auxiliary fuel tank may be installed in a recess formed in the hull.

[0007]

In the above structure, the fuel tank for the engine of the jet propulsion machine is composed of the regular fuel tank and the spare fuel tank, and when the fuel in the regular fuel tank becomes less than a certain amount, It is designed to use fuel, and by dividing the fuel tank, the change in weight at the same place in the full state and the empty state is reduced, and the size in the width direction of the fuel tank is increased. Without increasing the fuel load. As a result, a large trim change of the hull does not occur between the fuel tank full state and an empty state, and a large rolling does not occur, so that skill is not required for maneuvering. Further, by arranging the center lines of the regular fuel tank and the auxiliary fuel tank so as to coincide with the center line of the hull extending in the lengthwise direction of the hull in a plan view, the above effect can be further achieved.

Further, the regular fuel tank is constructed to have a capacity larger than that of the auxiliary fuel tank, and the ordinary fuel tank and the auxiliary fuel tank are arranged so as to have an ideal center of gravity when the tank is full, and the ordinary fuel tank is the auxiliary fuel tank. When it is installed closer to the center of gravity of the hull, it is possible to further reduce the occurrence of trim and rolling due to fuel consumption. Further, when the engine is arranged substantially at the center in the length direction of the hull and the regular fuel tank and the spare fuel tank are separately arranged on the front side and the rear side of the engine, both tanks should be close to the engine which is a heavy load. Therefore, the occurrence of trim change can be suppressed. Further, when the spare fuel tank is installed in the recess formed in the hull, there is an advantage that the recess can be used as a container when the spare fuel tank is unnecessary.

[0009]

1 and 2 show a first embodiment of the present invention, in which a ship body 1 of a water jet propulsion boat is composed of a deck member 11 and a ship body member 12 made of FRP and joined together at their peripheral portions. The engine hatch 1 is formed by the engine 2 installed inside the hull and can be opened and closed on the ship.
3 is formed. A handle support base 40 is formed near the rear part of the engine hatch 13, the operation handle 4 supported by the handle support base 40 is installed in the central portion in the width direction of the ship, and a driver's seat is formed on the rear side thereof. The seat main body 5 is arranged.

Foot steps 15 are formed on both sides of the driver's seat, the inside of the foot steps 15 rises upward to form a seat base 50, and the seat base 50 is formed.
The seat body 5 is detachably attached to the top.

A normal fuel tank 6 is installed on the front side of the engine 2 on a center line 100 extending in the longitudinal direction of the hull, and a spare fuel tank 7 is installed on the front side thereof. The carburetor 21 of the engine 2 is connected to the regular fuel tank 6 and the auxiliary fuel tank 7 via the three-way switching valve 8. Normally, the fuel from the regular fuel tank 6 is supplied to the carburetor 21, and the regular fuel tank 6 When the amount of fuel falls below a certain amount, the three-way switching valve 8 is switched to supply the fuel from the auxiliary fuel tank 7.

A jet propulsion device 3 driven by an engine 2 is installed at the bottom of the stern. This jet propulsion device 3 has a main body having a flow passage formed therein, an impeller 24 that rotates in the flow passage by transmitting a rotational force from the engine 2 through an impeller shaft 23, and a water opening at the bottom of the ship. And a water injection port 26 for injecting water sucked from the introduction port 25 to the rear of the stern.
Oscillates in a horizontal plane to eject water in a predetermined direction, thereby generating a propulsive force and a turning force.

3 to 5 show a second embodiment of the present invention, in which the engine 2 and the regular fuel tank 6 are arranged in the same manner as above, but the spare fuel tank 7 is arranged differently.
That is, the bow 70 of the hull 1 is provided with a recess 70 having an upper opening.
The auxiliary fuel tank 7 is installed in the recess 70, and an openable / closable hatch cover 71 is installed above the recess 70. The other structure is the same as that of the first embodiment. The regular fuel tank 6 and the spare fuel tank 7 are completely independent from each other and communicated with the carburetor 21, and when the fuel in the regular fuel tank 6 becomes less than a certain amount, the spare fuel tank 7 is manually switched. You may

In this structure, the center of gravity G1 of the normal fuel tank 6 is larger than that of the spare fuel tank 7 when both tanks 6 and 7 are full.
When the common fuel tank 6 is emptied, the center of gravity of the hull 1 shifts from the center of gravity G1 to the center of gravity G2. On the other hand, if the positions of the spare fuel tank 7 and the regular fuel tank 6 are exchanged and the spare fuel tank 7 is installed closer to the center of gravity G1 when both tanks 6 and 7 are full than the regular fuel tank 6, the regular fuel tank 7 The center of gravity when the tank 6 is empty is as follows:
Is closer to the center of gravity G3 when both tanks 6 and 7 are empty than the center of gravity G2 when the tank is full. That is, with the above configuration, the change in trim when the regular fuel tank 6 becomes empty can be reduced.

6 to 8 show a third embodiment of the present invention, in which only the regular fuel tank 6 is communicated with the carburetor through a fuel pipe, and the auxiliary fuel tank 7 is not connected with a fuel pipe. When the regular fuel tank 6 becomes empty, an occupant transfers the fuel in the spare fuel tank 7 to the regular fuel tank 6. The engine 2 is disposed substantially in the center of the hull 1 in the front-rear direction, the regular fuel tank 6 is disposed in front of the engine 2, and the auxiliary fuel tank 7 is disposed behind the engine 2. That is, a recess 73 having an open top is formed in the seat base 50, the auxiliary fuel tank 7 is installed in the recess 73, and the seat body 5 is installed so as to be able to open and close so as to cover the recess 73. Further, the battery 9 is arranged in front of the recess 73. Further, rearview mirrors 42 are attached to both sides of the engine hatch 13 so that the engine hatch 13 can be opened around the front end while the operation handle 4 and the like are attached as shown in phantom lines in FIG. It is configured.

As described above, when the regular fuel tank 6 and the spare fuel tank 7 are separately arranged in front of and behind the engine 2, the center of gravity G4 of both tanks 6 and 7 is full, and both tanks 6 and 7 are empty. In this state, the center of gravity G5 is very close to each other, and the change in trim between the two can be made very small.

FIGS. 9 and 10 show a fourth embodiment of the present invention, in which the engine 2 is arranged substantially in the center of the hull 1 in the front-rear direction, and the common fuel tank 6 is arranged in front of it. It is similar to the embodiment. And driver's seat 5
5 is formed to be as wide as the ship, and a recess 74 having an upper opening is formed in the seat base 56. The spare fuel tank 7 is installed in the recess 74, and the seat body 55 is covered so as to cover the recess 74. It is installed so that it can be opened and closed. Further, a partition wall 16 is formed below the front deck 57 of the seat main body 55 to partition a space (engine room) in which the engine 2 and the regular fuel tank 6 are installed and a space on the rear side. .

In the structure of the first embodiment, the fuel in the regular fuel tank 6 is the engine 2 in the normal traveling of the hull 1.
Is supplied to the engine to drive the engine.
By detecting this by an appropriate sensor (not shown), the three-way switching valve 8 is switched, and the fuel in the auxiliary fuel tank 7 is supplied to the engine 2, which allows the sailing to continue further. That is, the use of the fuel in the regular fuel tank 6 is changed to the use of the fuel in the spare fuel tank 7, and it is possible to suppress the trim change by preventing the weight reduction from occurring in only one place. There is.
Further, since the fuel tank is displaced in the length direction of the hull and is located on the center line of the hull, the fuel tank does not spread in the width direction of the hull, and rolling of the hull can be reduced.

In addition to the above-described effects, the second embodiment has an advantage that the auxiliary fuel tank 7 can be removed and the recess 70 can be used as a storage case when the auxiliary fuel tank 7 is not required. Further, in the third and fourth embodiments, the recess 7 in which the auxiliary fuel tank 7 is housed
3, 74 are covered by seat bodies 5, 55 that can be opened and closed, and by removing the auxiliary fuel tank, the recess can be used as a storage case. Further, in the third embodiment, the rear view mirror 42 is attached to the openable engine hatch 13.
Since the engine is attached, there is an advantage that when the engine hatch 13 is opened during maintenance of the engine 2, the rearview mirror 42 can be removed at the same time so as not to get in the way.

[0020]

As described above, according to the present invention, the fuel tank for the engine of the jet propulsion machine is composed of the regular fuel tank and the spare fuel tank, and the fuel in the regular fuel tank is less than a certain amount. When it becomes full, the fuel in the spare fuel tank is used.By dividing the fuel tank, it is possible to reduce the change in weight at the same place between full tank and empty tank. An increase in the fuel loading capacity is achieved without increasing the size of the tank in the width direction. As a result, a large trim change of the hull does not occur between the fuel tank full state and an empty state, and a large rolling does not occur, so that skill is not required for maneuvering. Further, by arranging the regular fuel tank and the auxiliary fuel tank on the center line extending in the longitudinal direction of the hull, the above effect can be better achieved.

If the regular fuel tank is constructed to have a larger capacity than that of the spare fuel tank, and the regular fuel tank is installed closer to the center of gravity of the hull than the spare fuel tank, trim and rolling will occur due to fuel consumption. Can be made smaller. Further, when the engine is arranged substantially at the center in the length direction of the hull and the regular fuel tank and the spare fuel tank are separately arranged on the front side and the rear side of the engine, the occurrence of trim can be suppressed. Further, when the spare fuel tank is installed in the recess formed in the hull, there is an advantage that the recess can be used as a container when the spare fuel tank is unnecessary.

[Brief description of drawings]

FIG. 1 is a side view of a hull showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of the hull showing a second embodiment of the present invention.

FIG. 4 is a plan view of FIG.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a side view of the hull showing the third embodiment of the present invention.

FIG. 7 is a plan view of FIG.

8 is a cross-sectional view taken along the line BB of FIG.

FIG. 9 is a side view of a hull side view showing a fourth embodiment of the present invention.

FIG. 10 is a plan view of FIG.

[Explanation of symbols]

 1 Hull 2 Engine 3 Jet Propulsion Machine 4 Operating Handle 5,55 Seat Body 6 Regular Fuel Tank 7 Spare Fuel Tank 70, 73, 74 Recess

Claims (5)

[Claims] 1. A jet propulsion machine having a water introduction port at the bottom of the ship and generating a propulsive force by injecting water to the rear of the stern, and an operation handle is provided on the ship in a substantially central part of the hull, and thereafter. A driver's seat is formed on the side, at least two fuel tanks for the engine of the jet propulsion machine are installed, one of which constitutes a regular fuel tank that is in constant communication with the engine, and the other is in the regular fuel tank. A fuel tank for a water jet propulsion boat, characterized in that it constitutes a backup fuel tank that is used when the amount of fuel in the water falls below a certain amount. 2. The fuel tank for a water jet propulsion boat according to claim 1, wherein all the fuel tanks are arranged on a center line extending in the longitudinal direction of the hull. 3. The service fuel tank is configured to have a larger capacity than the backup fuel tank, and the service fuel tank is installed closer to the center of gravity of the hull than the backup fuel tank. Fuel tank of water jet propulsion boat described in 2. 4. An engine is arranged substantially at the center of the length of the hull, and a regular fuel tank and a spare fuel tank are arranged so as to be divided into a front side and a rear side of the engine. A fuel tank for a water jet propulsion boat according to Item 1 or 2. 5. The fuel tank for a water jet propulsion boat according to claim 1, wherein the auxiliary fuel tank is installed in a recess formed in the hull.