JP2792708B2 - Water jet propulsion boat - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water jet propulsion boat gliding on the water surface.

[Conventional technology]

Recently, a water jet propulsion boat which performs various movements by sliding on the water surface has been widely used. The jet propulsion boat has a jet unit (propulsion unit) arranged at the stern end at the bottom of the hull. It is arranged so that it does not protrude behind the stern and below the ship bottom. Then, the impeller rotating in the flow passage formed in the jet unit sucks water from the bottom of the ship and sprays water rearward from the stern through a nozzle at the rear end of the flow passage, and this nozzle swings around a vertical axis. By moving the boat, the hull is propelled and turned, so that the boat slides on the water surface.

There is also an outboard-type jet boat, but in this structure, a jet unit is attached to the stern end so as to be able to move up and down, and this jet unit is configured to protrude greatly to the rear of the stern.

[Problems to be solved by the invention]

In the conventional water jet propulsion boat described above, when stopped, the flow path of the jet unit is located below the waterline, so when anchored on a quay when not in use, barnacles etc. Will adhere. For this reason, there is a problem that cleaning is very troublesome during use. In order to prevent this, it is necessary to raise the hull on land when not in use, and this handling operation is very complicated. In addition, it is necessary to check the jet unit in addition to the cleaning work, and this work also has a problem that it takes much time and effort.

The present invention has been made to solve such a conventional problem, and it is an object of the present invention to provide a water jet propulsion boat capable of preventing the adhesion of barnacles or the like without landing when not in use. The purpose of. In addition, the first
A second object is to protect the means for achieving the above object from being damaged.

[Means for solving the problem]

According to the present invention, a jet unit having a built-in impeller is disposed at the bottom of the stern, and an engine for driving the impeller is disposed in front of the jet unit. The jet unit has a water suction port that opens downward. And a water jet propulsion boat having a nozzle for jetting water backward, a rotating means for rotating the flow path about an axis extending in the longitudinal direction of the hull up to a position where the water suction port faces upward. Is provided.

Further, the drive shaft of the engine and the shaft of the impeller may be flexibly connected to each other, and may be provided with an elevating means for elevating the jet unit.

Further, it is preferable that a packing is disposed between the peripheral portion of the water suction port of the jet unit and the bottom plate so that this portion is sealed.

In addition, a jet unit incorporating an impeller is arranged in a recess formed at the bottom of the stern stern, and an engine for driving the impeller is arranged in an engine room in front of the impeller, and the jet unit opens downward. In a water jet propulsion boat having a flow path having a water suction port and having a nozzle for jetting water backward, a hull length is increased to a position where the water suction port faces upward or a raising / lowering means for raising / lowering the jet unit. A configuration may be provided in which a rotation unit that rotates the flow path about an axis extending in the hand direction is provided. In addition, it is preferable to form an inspection port having a lid that can be opened and closed on the wall of the recess.

[Action]

According to the above configuration, at the time of berthing of the hull, the flow path is rotated around the axis extending in the longitudinal direction of the hull to a position where the water suction port faces upward by the rotating means, so that water does not enter the flow path. It is possible to inspect and clean the inside of the flow path and the like by putting a hand through the water suction port facing upward. Further, if the lifting of the jet unit by the lifting means is added, the entire unit can be further distant from the water surface.

Further, the gasket arranged at the peripheral portion of the water suction port prevents air from being sucked into the flow path.

Further, if the jet unit and its rotating means or elevating means are housed in the recess, it can be prevented that these are damaged by an object (for example, driftwood) outside the boat and become inoperable.

In addition, if there is an inspection port with a lid that can be opened and closed on the wall inside the stern bottom recess, a person on the hull can close the inspection port lid without landing the hull or diving underwater. By opening the opening, operations such as inspection and cleaning of the jet unit can be performed through the inspection opening.

〔Example〕

1 to 3, a hull member constituting a ship bottom plate
12 and the deck member 11 that constitutes the upper deck are FR
The hull 10 is formed by integrally forming P and joining them together at the periphery. A seat (not shown) is formed behind the center of the hull 10, and an operation handle 10a is provided in front of the seat.

An engine room 18 is formed in the hull 10, and the engine 1 is installed in the engine room 18, and the jet unit 3 is disposed behind the partition 1 through a partition wall 15. The engine 1 is supported by a mount member 14.

The drive shaft 13 of the engine 1 is coupled to the front end of the impeller shaft 2 extending forward through the partition wall 15.
13a, and the connecting portion 4
Are formed. The connecting portion 4 includes an attaching member 16 attached to the front side of the partition wall 15 by bolts 17 and a partition wall.
Mounting member 40 mounted by bolts 47 on the rear side of 15
And a roll boot 45 made of a material having high elasticity such as rubber and capable of torsional deformation. This mounting member 16
Is formed with a cylindrical portion 16b at the center of the mounting plate 16a, and the mounting member 40 includes a mounting plate 42, a cylindrical portion 41 protrudingly formed at the center thereof, and a bottom plate 43 below the mounting portion 42. The bearing 44 is arranged inside.

The jet unit 3 has a flange 38 formed at the lower end thereof, a flow passage 30 having a water suction port 31 opening at the bottom of the ship, and a swingable about a vertical axis 80 at the rear end. The nozzle 8 is attached, and the impeller 20 is arranged in the flow path 30 at the tip of the impeller shaft 2. As shown in FIGS. 7 and 8, a packing 38a is attached around the flange 38. The packing 38a fills a gap between the flange 38 and the stern bottom plate 81, and the packing 38a is attached. Flange 3
8 can move diagonally upward as described later.

As shown in FIG. 3, the jet unit 3 is integrally formed with a shaft guide portion 32 through which the impeller shaft 2 penetrates so as to project rearward, and has a cylindrical portion 39 at a central portion and a gear 33 at a rear outer peripheral portion. Is formed. A cylindrical holding portion 34 is rotatably fitted on the cylindrical portion 39. The holding portion 34 is provided with a rib 34a, and the rotation drive motor 7 for rotating the pinion 73 by the rib 34a is attached. The tip of the shaft guide 32 is a cylindrical portion of the mounting member 40.
It is inserted into 41 and held rotatably by bearings 44.

Then, as the impeller 20 rotates in the flow path 30,
The hull 10 is propelled and turned by sucking water from the water inlet 31 and jetting water in a predetermined direction behind the stern through the nozzle 8.

On the upper side of the jet unit 3, there is formed a wall portion 19 extending in the stern direction from the partition wall 15, and on both sides thereof a side wall formed by extending the hull member 12 upward as shown in FIGS. 12a are formed facing each other. A recess 1a for accommodating the jet unit 3 is formed in a portion surrounded by the wall 19 and the side walls 12a, and a stern bottom plate 81 is attached to the bottom of the recess 1a.

The holding member 5 is attached to the wall 19 by bolts 51, and the rotation driving motor 7 and the jet unit 3 are held by the holding member 5. More walls
An opening / closing opening 50 is formed in the opening 19 so that a person on the hull 10 can inspect and clean the jet unit 3 through the opening 50.

The jet unit 3 and its rotating means are arranged in the recess 1a so as not to protrude from the outer surface of the hull 10, thereby preventing damage by an object (for example, running water) outside the boat and making it inoperable. So that it can be prevented.

In the above configuration, the person on the seat grips the operation handle 10a to drive the engine 1, rotates the impeller 20, sucks water from the water suction port 31, and jets the water through the nozzle 8 to the rear of the stern to thereby make the hull. Make 10 propulsions and turns.

While the hull 10 is sliding, the waterline 90 descends.If there is a gap around the flange 38, there is a greater possibility that air will be sucked from the gap and sucked into the flow path 30, thereby propelling the boat. The efficiency may decrease. Therefore, in order to prevent such a phenomenon from occurring, in the above-described configuration, the packing 38a is provided to prevent the occurrence of a gap that causes air to be sucked.

In a state where the hull 10 is stopped, the water suction port 31 is located below the waterline 90, so that water enters the flow path 30. Therefore, when the rotation drive motor 7 is driven to transmit the rotational force to the gear 33 via the pinion 73 from the state shown by the solid line in FIGS. It rotates around the impeller shaft 2 while being held at 34. In the state of rotation by 180 °, the water suction port 31 is directed upward, as shown by the imaginary line in FIG. 1 and the solid line in FIG. 6, and the flow path 30 is positioned above the water line 90. The berth can be berthed without water entering the road 30.

During this rotation, one end is attached to the cylindrical portion of the mounting member 40.
The roll boot 45 connected to 41 and the other end connected to the shaft guide 32 is twisted, but this torsion is absorbed by the torsion deformation of the roll boot 45 itself.

As shown in FIG. 7, the packing 38a attached to the flange 38 has its lip tip abutting against the stern bottom plate 81, so that the rotation of the jet unit 3 causes the flange 38 to move obliquely upward without any trouble. You can move.

To return from the states shown in the virtual lines in FIGS. 1 and 2 and the solid line in FIG.

FIG. 9 shows another example of the arrangement of the engine, in which the engine room 18 is formed on the front side of the operation handle 10a, and the shaft chamber 2a is formed on the rear side. A recess 1a in which the jet unit 3 is arranged is formed, and the shaft 13 of the engine 1 and the impeller shaft 2 are intermediate shafts.
It is linked via 2c. With such a configuration,
Since the engine room 18 requiring a large space and the cockpit directly formed on the operation handle 10a do not overlap, there is an advantage that the degree of freedom in designing the cockpit is increased.

10 to 14 show still another embodiment of the present invention, in which an engine 1 is supported by a mounting member 14 at a front end, and a support member 16c attached to a partition wall 15 by bolts 17 at a rear end. It is supported by the arm 16a. The drive shaft 13 of the engine 1 extends rearward through the partition wall 15, and the tip of the drive shaft 13 is connected to the impeller shaft 2 via a connecting portion 4a. The connecting portion 4a includes a support member 40a attached to the partition wall 15 by bolts 47, and a bellows-like joint boot 42a.
And a connector 48 having a bifurcated arm, a torsionally deformable roll boot 45, and a universal joint 46 passing therethrough. The arm of the connector 48 is provided on a pair of arms 49 formed on the support member 40a. The part is connected swingably in the vertical direction with a horizontal support pin 44a, a joint boot 42a is connected between the support member 40a and the connector 48,
A roll boot 45 is connected to the distal end side of the connector 48.

A wall portion 19 extending in the stern direction from the partition wall 15 is formed above the jet unit 3 and a recess 1a for the jet unit 3 is formed below the wall portion 19, and a stern bottom plate 81 is formed at the bottom of the recess 1a. Is installed. This stern bottom plate 81
A pair of guide rails 5a and a pair of ribs 52 are attached to the ribs. The lower end of the drive cylinder 6 is attached to each of the ribs 52 by a connecting shaft 62, and the upper end of the guide rail 5a is connected to the wall 19. Have been. This guide rail
5a is arranged along an arc locus having the universal joint 46 as a center of curvature, and a guide hole 5c is formed along the guide rail 5a. The upper end of the drive cylinder 6 is connected to the jet unit 3 by a connection shaft 61 as described later. The guide rail 5a and the drive cylinder 6 constitute an elevating means for the jet unit 3.

The configurations of the jet unit 3 and its rotating means are the same as those shown in FIGS. 1 to 6. The upper end of the drive cylinder 6 is connected to the side of the rib 34a provided on the holding member 34 by a connecting shaft 61, and the connecting shaft 61
Is inserted into the guide hole 5c of the guide rail 5a and moves along the guide hole 5c.

Also in this configuration, when the hull 10 is stopped, the water suction port 31 is located below the waterline 90, and thus the flow path 30
Water is contained inside. Therefore, the jet unit 3 is swung around the universal joint 46 to make the thirteenth
Raise as shown. That is, the drive cylinder 6
Is driven to apply an upward force to the jet unit 3 via the connecting shaft 61 at the upper end thereof, the connecting shaft 61
It moves diagonally upward along 5c and rises in a circular locus with the universal joint 46 as the center of curvature. In this embodiment, it reaches a rising position inclined by 30 ° from the running state (almost horizontal state). In this state, the flow path 30 is located above the water line 90, and no water enters the flow path 30.

In this state, the jet unit 3 is supported by the pair of drive cylinders 6 and the pair of guide rails 5a and is stable. Therefore, if the jet unit 3 is anchored in this state,
Barnacles and the like are prevented from adhering to the flow path 30.

Further, when the rotational drive motor 7 is driven from the state shown in FIG. 13 to transmit the rotational force to the gear 33 via the pinion 73, the jet unit 3 integrated with the gear 33 rotates while being held by the holding unit 34. And in the state rotated 180 °, the first
As shown in FIG. 4, the water suction port 31 faces upward, and the flow path 30 is positioned significantly above the waterline 90, so that water can be more reliably prevented from entering the flow path 30. .

During this rotation, the roll boot 45 having one end connected to the connector 48 and the other end connected to the shaft guide 32 is twisted. It is absorbed by kinking deformation. To return from this state to the operating state, the reverse operation to the above may be performed.

Further, in this embodiment, when the jet unit 3 moves up and down, the flange 38 moves substantially perpendicularly to the bottom opening, so that the packing 38a is not pressed against the periphery of the opening, and therefore the packing 38a is not pressed. There is an advantage that there is less risk of damaging the device.

FIGS. 15 to 21 show still another embodiment of the present invention, in which a seat 21 is formed in the vicinity of the center of the hull 10, an operation handle 10a is provided on the front side thereof, and In the part, a room 24 partitioned by a door 23 is formed by being surrounded by the deck member 11 and the hull member 12.

As shown in FIGS. 17 and 18, a stern deck 11a is formed by a deck member 11 on the rear side of the seat 21 of the hull 10, and a front central portion of the stern deck 11a is recessed to form both side walls. A recess is formed by 11b and the bottom wall 11c. The front and upper sides of the recess are covered with an L-shaped cover member 18c, and an engine room 18 is formed therein. Also bottom wall 11
An engine mount 18a is formed by partially protruding upward from part c.

The engine 1 is disposed in the engine room 18, the front end of which is supported by an engine mount 18 a, and the rear end of which is an arm 1 of a support member 16 c mounted on a partition wall 15 with bolts 17.
Supported by 6a.

On the rear side of the engine room 18, a wall portion 19 extending in the stern direction from the partition wall 15 is formed, and on both sides thereof, an extension of the hull member 12 is formed as shown in FIGS. 19 and 20. Both side walls 12a are formed, and these constitute a recess 1a. A stern bottom plate 81 is attached to the bottom of the recess 1a. In the recess 1a, the same structure as the jet unit 3 and its rotation and lifting / lowering means shown in FIGS. 11 to 14 is arranged.

In the vicinity of the front end of the wall 19, FIGS. 15 and 19 to
As shown in FIG. 21, an inspection port 9 is provided. This is a cylindrical part 91 extending upward from the wall part 19 and a lid covering the upper part.
The lid 92 is attached to the cylindrical portion 91 so as to be rotatable (openable and closable) around a hinge 93, and the closed state is maintained by a locking member 94 so that the watertight state is maintained.

In the above configuration, the person 10c on the seat 21 stops the hull 10 and activates the rotating means and the elevating means to bring the jet unit 3 into the state of the imaginary lines in FIGS. From above, a person 10c opens the lid 92 of the inspection port 9, and performs inspection, cleaning, or replacement of the packing 38a in the flow path 30 or other parts from the water suction port 31. In the normal state (the state shown by the solid line in FIG. 15), the packing 38a is disposed at the bottom of the ship, and in this state, it is necessary for a person to go underwater to replace the packing 38a. Takes a lot of time, but in the above configuration in which the jet unit 3 is rotated and raised and lowered, the hull
Since the work can be performed through the inspection port 9 from above, the work is easy.

In the above embodiment, an example is shown in which the jet unit 3 is configured to be able to move up and down and rotate. However, the jet unit 3 may be able to do only one of up and down and rotation, and in any case, by providing the inspection port 9, The person 10c on the hull 10 can easily inspect the jet unit 3 and the like.

Note that the inspection port 9 is not limited to the case where the inspection port 9 is provided in the upper wall portion 19. If space permits, it may be provided on the side wall.

〔The invention's effect〕

As described above, according to the present invention, when the hull is anchored, the water suction port is turned upward by the rotating means.
The flow path is rotated around an axis extending in the longitudinal direction of the hull, so that water can be prevented from entering the flow path, and the inside of the flow path is inspected and cleaned by putting your hand through the water suction port facing upward. Can do it. Further, if the lifting of the jet unit by the lifting means is added, the entire unit can be further distant from the water surface. For this reason, it is possible to reliably prevent barnacles and the like from adhering to the flow path during berthing.

Further, the gasket arranged at the peripheral portion of the water suction port prevents air from being sucked into the flow path.

Further, if the jet unit and its rotating means or elevating means are housed in the recess, it can be prevented that these are damaged by an object outside the boat (for example, driftwood) and become inoperable. The degree of freedom in designing the hull shape is increased.

In addition, if there is an inspection port with a lid that can be opened and closed on the wall inside the stern bottom recess, a person on the hull can close the inspection port lid without landing the hull or diving underwater. When the jet unit is opened, operations such as inspection and refreshment of the jet unit can be performed through the inspection opening. For this reason, the jet unit can be inspected not only when the hull is anchored but also during cruising with a simple inspection.

[Brief description of the drawings]

1 is an enlarged longitudinal sectional view of a propulsion unit showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the hull, FIG. 3 is an exploded perspective view of the propulsion unit, and FIG. 5 is a perspective view of the rear end of the hull bottom, FIG. 5 is a cross-sectional view of the bottom of the hull near the water suction port, FIG. 6 is a view corresponding to FIG. 1 with the jet unit rotated,
FIG. 7 is an enlarged cross-sectional view of a packing attachment portion on the periphery of the water suction port, FIG. 8 is an enlarged perspective view of the packing, FIG. 9 is a diagram corresponding to FIG. The figure is an enlarged longitudinal sectional view of a propulsion unit showing another example of the present invention,
FIG. 11 is a partially cutaway side view of the hull, FIG. 12 is an exploded perspective view of the propulsion unit, FIG. 13 is a diagram corresponding to FIG. 10 showing a state where the jet unit is raised, and FIG. FIG. 13 is a diagram showing a state in which the jet unit is rotated after being raised, and FIG.
FIG. 15 is an enlarged longitudinal sectional view of a propulsion unit showing a further embodiment, FIG. 16 is a partially cutaway side view of the hull, FIG. 17 is a plan view of the rear part of the hull, FIG. 18 and FIG. The figures are cross-sectional views of the hull along the lines AA and BB in FIG. 16, respectively.
The figure is a perspective view of the bottom of the rear end of the hull, and FIG. 21 is a perspective view of the inspection port. 1 ... engine, 1a ... recess, 2 ... impeller shaft, 3 ... jet unit, 4,4a ... connecting part, 5 ...
Holding member, 5a guide rail, 6 drive cylinder,
7 ... Rotary drive motor, 8 ... Nozzle, 9,50 ... Inspection port, 10 ... Hull, 20 ... Impeller, 30 ... Flow path, 31 ...
Water suction port, 38a …… Packing.

──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number Japanese Patent Application No. 1-65274 (32) Priority date Hei 1 (1989) March 16 (33) Priority claim country Japan (JP) (58) Field (Int.Cl. ⁶ , DB name) B63H 11/10 B63H 11/08 B63H 5/12

Claims (5)

(57) [Claims] A jet unit incorporating an impeller is disposed at the bottom of a stern stern, and an engine for driving the impeller is disposed in front of the jet unit. The jet unit has a water suction port that opens downward. A water jet propulsion watercraft having a nozzle formed with a path and jetting water rearward, comprising: a rotation for rotating the flow path around an axis extending in a longitudinal direction of the hull to a position where the water suction port faces upward. A water jet propulsion boat characterized in that means are provided. 2. The water jet propulsion boat according to claim 1, wherein a drive shaft of the engine and a shaft of the impeller are flexibly connected to each other, and elevating means for elevating the jet unit is provided. 3. The water jet propulsion boat according to claim 1, wherein a packing is disposed between a peripheral portion of a water suction port of the jet unit and a bottom plate. 4. A jet unit having a built-in impeller is disposed in a recess formed at the bottom of the stern stern, and an engine for driving the impeller is disposed in an engine room in front of the jet unit. In a water jet propulsion boat having a flow path having a water suction port that opens toward the front and having a nozzle for jetting water backward, a lifting means for raising and lowering the jet unit or a position where the water suction port faces upward. A water jet propulsion boat provided with a rotating means for rotating the flow path about an axis extending in the longitudinal direction of the boat body. 5. The water jet propulsion boat according to claim 4, wherein an inspection port having an openable / closable lid is formed in a wall of the recess.