JP3120862B2 - Water jet propulsion boat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet propulsion boat gliding on the water surface.

[0002]

2. Description of the Related Art In recent years, water jet propulsion boats which perform various movements by sliding on the water surface have been used. In this jet propulsion boat, a jet unit (propulsion device) is disposed in a recess at the stern end at the bottom of the hull, and is disposed so as not to protrude rearward and downward of the boat bottom. Then, the impeller rotating in the flow path formed in the jet unit sucks water from below the water surface and injects water rearward from the stern through the water injection port at the rear end of the flow path, and this water injection port is By swinging about the vertical axis, the hull is propelled and turned to slide on the water surface.

[0003]

In such a water jet propulsion boat, there is a problem of where to provide an exhaust port for exhaust gas of the engine. If this exhaust port is provided on the side of the hull, the exhaust gas that has flowed backward during traveling will contaminate the side of the hull, so this exhaust port may be opened in the recess where the jet unit is located or on the stern plate. I have. However, when the exhaust port is opened in the recess or on the stern plate, the exhaust gas flows toward the water suction port of the jet unit during reverse travel, depending on the position where the exhaust port is opened, and this is sucked into the flow path of the jet unit and jetted. This causes problems such as rust inside the unit.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional drawback. In particular, a water jet having a structure capable of preventing the exhaust gas of an engine from being sucked into a flow path of a jet unit when the vehicle is moving in reverse. It is intended to provide a propulsion boat.

[0005]

According to the first aspect of the present invention, a jet unit including an impeller driven by an engine is arranged in a recess formed in the center of the bottom of the stern stern. The mouth is opened, the jet unit is formed with a water suction port that opens below the water surface, and water is configured to suck water from the water suction port and jet water toward the rear of the stern by the water jet port. In the jet propulsion boat, a reverse gate capable of opening and closing the rear surface of the water injection port is provided, and a left-right bottom cross-sectional shape between the water suction port and the stern plate is formed in a V-shape. The invention according to claim 2 is characterized in that a jet unit incorporating an impeller driven by an engine is disposed in a recess formed at the center of the stern bottom, and an exhaust port of the engine is opened in the stern plate. Is a water jet propulsion boat that is formed to have a water suction port that opens below the water surface and is configured to suck water from the water suction port and jet water toward the rear of the stern by the water jet port. A reverse gate that can open and close the rear surface is provided, and the stern plate on the side of the recess is inclined so as to approach the bow side as it goes sideways, and is inclined so as to approach the stern side as it goes upward. Thus, an inclined surface facing obliquely rearward and downward is formed, and the exhaust port is provided on the inclined surface.

[0006]

[0007]

In the structure of the first aspect, when the reverse gate is closed, water is jetted forward and downward from the water injection port, and the stern moves backward with a slightly upward direction. At this time, since the bottom cross section between the water suction port and the stern plate is formed in a V-shape, even if exhaust gas enters below the bottom of the ship when the ship is moving backward, the exhaust gas along the ship bottom along with the water is directed to the side. Since it is discharged, it is difficult to be sucked from the water suction port, and it is possible to prevent the exhaust gas from being sucked into the jet unit. In the configuration of claim 2, when the reverse gate is closed, water is jetted forward and downward from the water injection port, so that the stern moves backward slightly upward. At this time, since the exhaust port is provided on the inclined surface approaching the bow side as it goes to the side and the inclined surface facing diagonally backward and downward, it is easy for exhaust gas to be discharged to the side and upward along the bottom of the ship when reversing This makes it difficult to be sucked from the water suction port, thereby preventing the exhaust gas from being sucked into the jet unit.

[0008]

1 to 4, a hull member 12 constituting a bottom of a ship and a deck member 11 constituting an upper deck are integrally formed by FRP. It is configured. Behind the center of the hull 10, a cockpit floor 100 is formed between the bulwarks 101 on both sides, a seat 74 is formed here, and an operation handle 10a is provided in front of the floor. A partition member 75 is provided on the floor 100 on the front side thereof, and a container 79 is formed on the front side thereof. A windshield 76 which forms an extension surface of the deck member 11 is formed on the upper part of the container 79 as shown in FIG. Is formed of a transparent plate. A bow step 66 is disposed at the center of the bow on the deck member 11, and cleats 91 are formed at four locations on both sides in this embodiment. A throttle handle 77 and a shift handle 78 are disposed on one side of the operation handle 10a, and a stern rail 1 is provided on the stern.
18 are formed.

As shown in FIGS. 5 to 8, the hull 10 has a space between the side walls 19, the partition wall 15 and the front wall (partition wall) 1.
7, an engine room 18 is formed. In this engine room 18, a pair of engines 1 supported by the hull member 12 via the mount member 14 are installed in this embodiment. A fuel tank 24 and an oil tank 27 are arranged in a front wall of the engine room 18 in a section surrounded by the partition walls 58, 17 and the partition wall 57.
4 leads out an oil supply pipe 241 and an air vent pipe 242. Further, a recess 1a is formed between the side walls 108 across the partition wall 15 behind the engine room 18, and a pair of jet units 3 are disposed in the recess 1a.
Thus, it is possible to prevent the jet unit 3 from being damaged and become inoperable by an object (for example, driftwood) outside the hull. A battery 23 and a muffler 64 are respectively disposed in the side sections 21 on both sides of the recess 1a, and an exhaust port 651 opening to the stern plate 110 is connected to the muffler 64. The recess 1a has a partition wall 15, an upper wall 102, a stern plate 110,
It is defined by both side walls 108 and a bottom wall 121. A hole 109 for venting air is formed in the upper wall 102. Thus, the recess 1 for the jet unit 3
a, the engine room 18, the compartment of the fuel tank 24, and the compartment of the battery 23 are each partitioned by a partition wall.
There is an advantage that the maintenance can be improved without the other parts getting in the way during each maintenance. Cockpit floor 10
The inboard compartment, which is a dead space on the lower side and the front side of 0, may be filled with a foaming material so as to increase buoyancy at the time of flooding and to improve rigidity of the hull.

The mounting member 141 at the center of the hull is shown in FIG.
As shown in FIG. 6, the bilge box is configured to cover the lowest position of the bottom of the ship, and also serves as a bilge box. The bilge flows into the mount member 141, and the strainer 126 is disposed therein. The bilge is suctioned through a pipe 125 by a bilge pump 122 attached to the pump 108, and is discharged from a discharge port 123 opened into the recess 1a. In this case, there is no problem that the ship side plate is soiled and the appearance is deteriorated as in the case where the bilge discharge port is opened in the ship side plate.

An opening 111 having a size substantially equal to the projected area of the jet unit 3 is formed in the stern plate 110, through which water is jetted from the water jet port 8 in a predetermined backward direction, and the jet unit 3 is moved. The size of the opening 111 is minimized as far as it can be pulled out rearward. As shown in FIG. 8, the peripheral edge of the opening 111 is formed with a side flange 113 formed by bending the stern plate 110 inward and an upper flange 112, whereby the opening 111 has a substantially larger size. And the periphery of the opening is reinforced. A notch 114 is formed in the upper flange 112 so that the rear end of the jet unit 3 can pass upward.

Openings 65 are formed on both sides of the stern plate 110 so that an exhaust port 651 for exhaust gas from the engine faces. The stern plate 110 near the opening 65 has a recess 1a
As you go from side to side, tilt so that it approaches the bow side,
In addition, inclined surfaces 151 and 155 (see FIG. 8) are formed so as to incline toward the stern side as going upward, and to face obliquely rearward and downward, and the exhaust gas discharged from the exhaust port 651 is discharged to the inside of the opening 65. Is guided to the side by being restricted by the inclined surface 151 from flowing toward the recess 1a. The opening 65 is provided with a guide wall 152 extending between the exhaust port 651 and the recess 1a in the front-rear direction. This guide wall 152 also guides the exhaust gas to the side by restricting the exhaust gas from flowing toward the recess 1a, similarly to the inclined surface 151. Further, the stern plate 110 is formed with an inclined surface 153 that covers the upper portion of the opening 65 and that is inclined upward from the recess 1a to the side. The exhaust gas discharged from the exhaust port 651 is
It is guided laterally while flowing upward along 53. That is, the inclined surfaces 151 and 153 and the guide wall 152 form a guide portion for guiding the exhaust gas to the side.

The stern plate 110 has an inclined surface 151,1.
It is not necessary to provide all of 53 and the guide wall 152,
Either one can guide the exhaust gas to the side. The stern plate 110 above the opening 65 is formed on an inclined surface 155 that is inclined rearward as going upward (see FIG. 8). Therefore, the exhaust gas discharged from the exhaust port 651 is guided backward while flowing upward along the inclined surface 155.

A hatch 85 is formed above the engine room 18, a rear bulwark 105 is formed at the front end of the upper wall 102 of the recess 1a, and a cockpit is formed at the front. The upper wall 102 has an inspection port (hatch) 2 behind the rear bulwark 105.
8 is provided at its rear end so as to open and close around a hinge 29. When the hatch 28 of the recess 1a serving as the water intrusion section is arranged outside the bulwark 105 in this way, the minimum freeboard height can be increased.

The jet unit 3 is shown in FIGS.
As shown in FIG. 11, it is configured to be able to move up and down in the recess 1a by means of a lifting drive. That is, the jet unit 3 is provided with the water introduction section 31 having the shaft guide section 31a.
And a cylindrical portion (impeller housing) 32 connected to the rear end by a flange, and an impeller duct portion 34 connected to the rear end by a flange.
These form the front part of the jet unit 3. A water suction port 30 is formed at the lower end of the water introduction part 31, and a flange 36 is formed at a peripheral edge thereof. A packing 92 is sandwiched between the flange 36 and the bottom wall 42 to form the water suction port 30. The surroundings are sealed. The water suction port 30 is provided with a screen 39 for preventing foreign matter from flowing into the flow path 37.

As shown in FIGS. 9 and 10, the transmission shaft 13 of the engine 1 penetrates the partition wall 15, and the penetrating portion is supported by a bearing member 16 via a bearing 16a. The universal joint 46 and the impeller shaft 2 are sequentially connected to the rear end, and the impeller 2 is connected to the rear end of the impeller shaft 2.
And a bearing 34a having a tip portion formed at the center of a stationary blade 34b in the impeller duct portion 34.
And the impeller 20 is arranged to rotate in the impeller housing 32. The impeller shaft 2 and the universal joint 46 are spline-coupled so as to be able to be pulled out in the axial direction, and an oil seal 38b is mounted between the shaft guide 31a and the impeller shaft 2 so that the oil seal 38b is provided. Prevents air mixing.

A housing 49 is connected to the distal end of the shaft guide portion 31a, and a pair of arms 49c are formed at the front end of the housing 49. Similarly, the front wall 43 of the bracket 4 is opposed to the arm 49c. A housing 47 having two arms is provided, and both arms are connected to each other by a horizontal connecting shaft 47a so that the housing 49 can swing around the connecting shaft 47a. This housing 47 and 4
An extendable boot 48 is externally fitted to the outer peripheral portion of the belt 9 and is fixed by a band 48a. A universal joint 46 is provided in these housings 47 and 49.
And the impeller shaft 2 penetrates and the housing 49
The inside is supported by a bearing 49a, and the connecting shaft 47a of the housing and the bending axis of the universal joint 46 are located on the same line.

The impeller duct (inner cylinder) 34 is
A rotatable fitting is inserted into a holding cylinder (outer cylinder) 60 via a sleeve 62, and a gear 33 is formed on an outer peripheral portion of the impeller duct portion 34. A holding cylinder 61 is connected to the rear side of the holding cylinder 60. The holding cylinders 60, 61 are held on both sides by connecting members 55 attached to the inside of the distal end of the elevating arm 5 so as to face each other. ing. A conical portion (nozzle) 35 whose internal flow path tapers is connected to the rear end of the holding cylinder 61, and the rear end of the conical portion 35 swings around a vertical axis 80 in a horizontal plane. A water jet 8 is attached. A rear portion of the jet unit is constituted by the holding cylinders 60 and 61, the conical portion 35, the water jet port 8, and the like.

An arm 82 swinging around the pin 82a and a reverse gate 81 swinging around the pin 81a to open and close the rear surface of the water outlet 8 are attached to the water jetting port 8.
The reverse gate 81 is opened and closed by this arm 82,
The reverse gate 81 is opened and closed via the arm 82 by pushing and pulling the operation cable 83 from the cockpit.

The holding members 60 and 61 are provided with mounting members 7.
The drive motor 7 is mounted on the outer periphery of the holding cylinder 60, and the pinion 70 mounted on the rotating shaft 7a of the drive motor 7 is attached to the mounting members 71, 72.
While being held inside, it faces the inside through a notch 60 a formed in a part of the holding cylinder 60, and meshes with the gear 33 on the outer periphery of the impeller duct 34.

FIGS. 13 and 14 show the details of the cleat 91. A shaft 94 is mounted on a recess 98 formed in the deck member 11 with a bolt 93 so that the upper end thereof is flush with the surface of the deck member 11. On the other hand, the terminal 96 is attached to the end of the rope 96 and an annular portion 97 is formed in the middle, and the terminal 96 is passed over the rope 96 through the lower side of the shaft 94. , And is locked to the annular portion 97. FIGS. 15 and 16 show an example in which the cleats 91 are formed at the corners of the deck, and one of the concave portions 98 is opened (opening portion 99) to make it convenient to pull the rope 96 slightly downward from the side. .
When the cleats 91 are formed so as not to protrude from the outer surface of the hull, the outer surface of the hull is entirely smooth and the appearance is improved.

In the above configuration, the person on the seat grips the operation handle 10a to drive the engine 1 in the state shown by the solid line in FIG. 9, and rotates the impeller 20 to suck water from the water suction port 30 into the flow path 37. Then, the hull 10 is propelled and turned by jetting the water in a predetermined direction behind the stern through the water jet port 8. Then, the exhaust gas of the engine is discharged from the silencer 64 to the rear of the stern plate 110 through the exhaust port 651. Then, when the reverse gate 81
When water is closed, water is spouted forward and downward from the water injection port 8, and the stern moves backward slightly upward. At this time, FIG.
As can be seen from FIG. 3, since the left and right cross-sectional shape of the bottom of the hull between the water suction port 30 and the stern plate 110 is formed in a V-shape, even if exhaust gas enters below the bottom of the hull at the time of reversing, the bottom of the hull is taken along with the water. The exhaust gas is discharged to the side along, so it is difficult to be sucked from the water suction port 30, and the exhaust gas can be prevented from being sucked into the jet unit 3. Further, since the inclined surface 151 approaching the bow side as going to the side of the stern plate 110 and the inclined surface 155 facing obliquely rearward and downward are provided with the exhaust opening 65, the exhaust gas along the hull 10 at the time of reversing. Is easily discharged to the side and upward, and is not easily sucked from the water suction port 30, so that exhaust gas can be prevented from being sucked into the jet unit 3. Note that, in addition to the inclined surfaces 151 and 155, the opening 65
Since the inclined surface 153 and the guide wall 152 for guiding the exhaust gas to the side are provided in the vicinity, even when the hull 10 moves backward, the exhaust gas discharged from the exhaust port 651 is laterally provided. And it becomes difficult to flow toward the water suction port 30. This prevents exhaust gas from being sucked into the jet unit 3.

When the hull 10 is running, a lateral force in a direction opposite to the turning direction acts on the jet unit 3 near the rear end thereof, particularly at the time of turning, to move the jet unit 3 in the horizontal direction. However, in the jet unit 3, the impeller duct portion 34 is held by the lifting arm 5 via the connecting member 55, and the lifting arm 5 is guided by the thrust receiver 41 a of the bracket 4 so as not to move in the lateral direction. In addition, no force other than the axial direction acts on the impeller shaft 2 during turning.

When the hull 10 is stopped, the water suction port 30 is located below the waterline 90, so that the flow path 3
7 is filled with water. Therefore, the jet unit 3 is raised above the draft 90. That is, the hydraulic cylinder device 50 is driven by the hydraulic pump 56 to contract the piston rod 50c, the lifting arm 5 is rotated around the pin 5a via the rib 51, and the jet unit 3 is connected via the connecting member 55 to the jet unit 3 in FIG. From the state of to the state of the virtual line. With this rise, the impeller shaft 2 also bends at the portion of the universal joint 46 that is connected to the transmission shaft 13. In addition, due to this rise, the water suction port 30 comes to be located on the waterline 90.

At this time, a compression force in the axial direction is applied to the impeller shaft 2, and this force is received by the pair of elevating arms 5, so that an excessive compression force is applied to the impeller shaft 2. I won't let you.

When the drive motor 7 is driven from the above raised state to rotate the impeller duct section 34 via the pinion 70 and the gear 33, the impeller housing 32 and the water introduction section 31 connected thereto rotate simultaneously, FIG.
As shown by the imaginary line, the water suction port 30 faces upward, so that it becomes more difficult for water to enter the flow path 37. Further, since the inspection port 28 is formed in the upper wall 102, the flow path 37 is formed from here.
Cleaning and inspection can be easily performed.

[0027]

As described above, according to the first aspect of the present invention, when the reverse gate is closed, water is jetted forward and downward from the water injection port, so that the stern moves backward slightly upward. At this time, since the bottom cross section between the water suction port and the stern plate is formed in a V-shape, even if exhaust gas enters below the bottom of the ship when the ship is moving backward, the exhaust gas along the ship bottom along with the water is directed to the side. Since it is discharged, it is difficult to be sucked from the water suction port, and it is possible to prevent the exhaust gas from being sucked into the jet unit. According to the second aspect of the invention, when the reverse gate is closed, water is jetted forward and downward from the water injection port, so that the stern moves backward slightly upward. At this time, since the exhaust port is provided on the inclined surface approaching the bow side as it goes to the side and the inclined surface facing diagonally backward and downward, it is easy for exhaust gas to be discharged to the side and upward along the bottom of the ship when reversing This makes it difficult to be sucked from the water suction port, thereby preventing the exhaust gas from being sucked into the jet unit.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hull showing an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the hull.

FIG. 3 is a side view of the hull.

FIG. 4 is a plan view of the hull.

FIG. 5 is a horizontal sectional view of a propulsion unit.

FIG. 6 is a sectional view taken along line AA of FIG. 2;

FIG. 7 is a sectional view taken along line BB of FIG. 2;

FIG. 8 is a perspective view of the stern of the hull.

FIG. 9 is a longitudinal sectional view of a propulsion unit.

FIG. 10 is an exploded perspective view of a propulsion unit.

FIG. 11 is a rear view of the hull.

FIG. 12 is a perspective view of a hull bow.

FIG. 13 is a perspective view of a cleat.

FIG. 14 is a sectional view of the cleat.

FIG. 15 is a perspective view showing another example of the cleat.

FIG. 16 is a sectional view of the cleat.

FIG. 17 is a sectional view taken along line CC of FIG. 11;

18 is a sectional view taken along line DD of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 1a recess 2 Impeller shaft 3 Jet unit 5 Elevating arm 8 Water jet port 10 Hull 50 Hydraulic cylinder device 100 Cockpit floor 110 Stern board 651 Exhaust port

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B63B 1/18 B63B 3/00 B63B 35/73 B63H 11/08 B63H 11/11 B63H 21/32

Claims (2)

(57) [Claims] 1. A recess formed in the center of the stern bottom ,
A jet unit with a built-in impeller driven by the engine is arranged, and the exhaust port of the engine is opened on the stern plate.
Is the mouth, the water jet unit is formed of water suction port opened under water and configured to inject water into the stern rearward by the water suction port to suck water water injection port
The water jet propulsion boat has a reverse gate that can open and close the rear surface of the water injection port.
At the bottom of the ship between the water suction port and the stern plate
A water jet propulsion boat, wherein a cross-sectional shape is formed in a V-shape . (2) In the recess formed in the center of the stern bottom,
A jet with a built-in impeller driven by the engine
Unit is located, and the exhaust port of the engine is opened on the sternboard.
When the jet unit is opened, the jet unit opens below the water surface.
A suction port is formed, and water is sucked from this water suction port to
The jet is configured to inject water to the rear of the stern
In a water jet propulsion boat, A reverse gate that can open and close the rear surface of the water injection port is provided
And the sternboard on the side of the recess goes to the side
In the direction of the bow according to
Incline toward the stern side as
A downwardly facing inclined surface is formed, and the exhaust port is formed on the inclined surface.
A water jet propulsion boat characterized by being provided.