JP3342961B2 - Structure of water jet propulsion boat propulsion unit installation section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a water jet propulsion device is mounted on the stern stern, and water is drawn from a water suction port on the stern bottom and jetted in a predetermined direction rearward from a water injection port at the stern end to travel at high speed on the water. 2. Description of the Related Art A water jet propulsion boat is known which performs various movements such as sudden start and sudden turning. The water suction port is provided with a screen to prevent foreign substances and the like floating in the water from being sucked into the channel, and to remove foreign substances caught on the screen and to inspect the inside of the channel. An inspection port for performing the inspection is formed in the propulsion unit body.

[0003]

In the above-mentioned water jet propulsion boat, when the inspection port is formed in the main body of the propulsion machine, it is necessary to attach a lid to the inspection port so that water does not enter the compartment of the ship from the inspection port. However, there is a risk that water may enter the ship compartment due to the forgetting to close the lid, leakage, or damage to the inspection port.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and ensures that water can permeate into an inboard compartment even if a leak or the like occurs at an inspection port of a water jet propulsion device. It is an object of the present invention to provide a structure of a water jet propulsion boat propulsion unit installation portion that can be prevented.

[0005]

According to the present invention, in a water jet propulsion boat, a rear deck is formed at a stern portion, and water is sucked from a water suction port at the bottom of the stern and jetted rearward at the stern. A water jet propulsion device is installed to generate a propulsion force by this, an engine for driving the water jet propulsion device is installed in the inboard compartment on the front side, and the main body of the water jet propulsion device has An inspection port for inspection is formed, the inspection port having a main body penetrating the rear deck in a watertight structure and opening on the rear deck, and a lid of a watertight structure that can be opened and closed is attached to this opening. It is.

[0006]

According to the present invention, since the inspection opening is opened on the rear deck, it is possible to easily open and close the lid at the time of the inspection work, and to prevent water leakage from the opening of the inspection opening. On the other hand, there is no danger of flooding into the engine room.

[0007]

[0008]

[0009]

[0010]

[0011]

1 to 3 show a first embodiment of the present invention. A hull 1 of a water jet propulsion boat has a hull member 11 and a deck member 12 integrally formed by FRP molding.
Are joined to each other at their peripheral edges, and a pair of side hulls 2 on both sides are formed in a catamaran shape joined to each other. A cockpit 1 near the center of the hull 1
0 is formed, and a deck 22 opened at the stern end is provided on the rear side between the hulls 2 on both sides. In the cockpit 10, an operation handle 3 is provided on one front side, a windshield 33 is provided on the front side, a driver's seat 30 is provided on the rear side of the operation handle 3, and the other side is provided. A passenger seat 31 is provided in the section. An engine 5 is installed in an engine room 50 near the center of each of the side hulls 2.
The water jet propulsion machine 4 driven by the stern is installed in the propulsion machine installation section 40 at the bottom of the stern stern. A watertight bulkhead 21 is provided in front of the propulsion unit installation section 40, so that the propulsion unit installation section 40 is placed in the front engine room 5.
It is isolated by a watertight structure from the inboard compartment such as 0.

A hatch cover 55 is provided above the engine room 50, and a hatch cover 13 is provided above the propulsion unit installation section 40. A battery 51 is installed on the front side of each engine 5, and a fuel tank 52 is installed on the bow of each side hull 2. The hatch cover 13 may be rotated around a hinge at the rear end as shown in FIG. 1 to open and close, or may be rotated around a hinge at one side as shown in FIG. You may do so.

The water jet propulsion device 4 is configured as shown in FIGS. That is, the main body of the water jet propulsion device includes a front main body 111 and a rear main body 46 fixed to the front main body 111 by bolts. The flow passage 42 is formed inside the main body, and the rear main body 46 is made of aluminum or the like. The front body 111 is made of FRP. A water injection port 45 is attached to the rear end of the rear body 46 so as to be swingable about a vertical axis 450.

On the front side of the rear body 46, a front body 111 is formed, which is an extension of the hull member (including the bottom plate) 11, and the front body 111 has a cylindrical portion 49 extending forward.
The front end of the cylindrical portion 49 is connected to the watertight partition 21 in a watertight structure. An impeller 44 is rotatably disposed in the flow passage 42, and the impeller shaft 43 extends forward and passes through the cylindrical portion 49 and is connected to the engine 5 installed on the front side of the watertight partition 21. I have.

A water suction port 41 at the front end of the flow path 42 is opened at the bottom of the ship, and a screen 41 for preventing large foreign substances in the water from flowing into the flow path 42 is provided at the opening.
The screen 410 is attached so as to be flush with the front bottom plate (hull member) 11 and the rear bottom plate 411, and forms the lower wall of the flow path 42 of the front body 111. are doing.

The front body 111 is formed integrally with the hull member 11 when the hull member 11 is molded.
An inspection port for inspecting the inside of the flow path 42 is formed at an upper portion of the first inspection port 1. The inspection port is formed by a cylindrical inspection port main body 6 extending above the water surface when the boat is stopped. The inspection port main body 6 includes a cylindrical portion 60 and a flange 61 formed at an upper end thereof, and a lid 7 having a shape along the inner surface of the cylindrical portion 60 and the flange 61 is attached to be openable and closable (detachable). I have. That is, the lid 7 is formed of a cylindrical portion 73 having a shape along the inner peripheral surface of the cylindrical portion 60, a flange 71 formed at the upper end thereof, and a bottom plate 74. A surface is formed so that irregularities do not occur at the inspection port 6 on the inner peripheral surface of the flow path. Further, a packing 70 is interposed between the flange 71 of the lid 7 and the flange 61 of the inspection port main body 6, the flange 71 is pressed from above by the fastening tool 8, and the fastening tool 80 is tightened to be mounted in a sealing structure. Like that.

The main body of the water jet propulsion device may be made of metal instead of separately forming the front portion and the rear portion as described above. Instead of using the lid 7, the inspection port may be sealed by a fastener with a blind plate that covers the upper surface of the inspection port main body 6.

FIGS. 7 to 9 show a second embodiment of the present invention. A hull 1a of a water jet propulsion boat is composed of a hull member 11 and a deck member 12 integrally formed by FRP molding in the same manner as described above. The hulls are configured in a so-called monohull structure, although they are joined together at their peripheral edges. A cockpit 10a is located near the center of the hull 1a.
In the cockpit 10a, an operation handle 3a is provided at a front center portion, and a straddle-type seat 33 for a driver is provided at the rear side, and a rear passenger portion is provided at both rear sides. A seat 34 is provided.

A backrest 35 is provided at the back of the rear seat 34, and a rear deck 2 opened to the stern side is provided on the rear side.
5 are provided. Under the rear deck 25, a propulsion unit installation section 40a is formed, and the water jet propulsion unit 4 is installed. An engine room 50 is formed in front of the propulsion unit installation section 40a via a partition 21a, and an engine 5 and a fuel tank 52 are installed here. The partition 21a may be formed in a water-tight structure, but need not necessarily be a water-tight structure as described later.

The water jet propulsion unit 4a has a main body forming a flow path including a front main body 4b and a rear main body 4c, and the front main body 4b is disposed in the propulsion unit installation section 40a. A stern section 81 is formed at the lower rear end of the stern section and is opened in the stern direction by being partitioned by partition walls 82 and 83, and the rear main body 4c is disposed in the stern section 81. The front main body 4b and the rear main body 4c are connected by being clamped together with a partition wall 82 interposed therebetween, and a watertight structure is provided at this connection part by interposing a sealing member (not shown) to form a propulsion unit installation section 40a. Water is prevented from entering.

In the inspection port body 6a, a tubular portion 60 formed integrally with the front body 4b penetrates the rear deck 25 in a watertight structure, and a watertight structure lid 7a is mounted on the upper side thereof. That is, a mounting flange 76 is mounted on the rear deck 25 at a portion where the cylindrical portion 60 passes through the rear deck 25, and a seal is provided between the inner peripheral surface of the flange 76 and the upper outer peripheral surface of the cylindrical portion 60. A member 75 is attached, whereby the penetration is formed in a watertight structure. A female screw is formed on the inner peripheral surface of the upper end portion of the flange 76, and a lid 7a on which a male screw corresponding to the female screw is formed is screwed into the female screw, thereby forming a lid 7a on the flange 76.
Is installed. A flange is formed at the upper end of the cylindrical portion 73 so as to protrude from the outer periphery thereof. An O-ring is interposed between the lower surface of the flange and the upper end surface of the cylindrical portion 60 to seal the cylindrical portion 73. Water is prevented from leaking through the space between the cylindrical portion 73.

Further, inside the cylindrical portion 60, the lid 7 composed of a cylindrical portion 73 formed along the inner peripheral surface of the cylindrical portion 60 and a bottom plate 74 formed at the lower end thereof is detachably attached. The lower surface of the bottom plate 74 forms the inner peripheral surface of the flow path 42 so that the inner peripheral surface of the flow path does not have irregularities at the inspection port. In the example shown in this figure, the lid 7 and the lid 7a have a double structure.
May be provided, or only the lid 7a without the lid 7 may be provided.

In the structure of the first embodiment, the hatch cover 13 is closed and the cover 7 is
Are mounted and tightened and sealed by the tightening tool 8. When the inspection in the flow path 42 is performed, the hatch cover 13 is opened, the fastener 8 and the lid 7 are removed, and the inspection is performed by inserting a hand into the flow path 42 through the inspection port body 6. At this time, if the upper surface of the inspection port main body 6 is set at a position higher than the waterline at the time of the stop of the ship as in the above configuration, the inspection work can be performed even at sea. Further, since the propulsion unit installation section 40 is separated from the inboard section such as the engine room 50 by the watertight bulkhead 21 on the front side, even if water overflows from the inspection port, it only collects in the propulsion unit installation section 40 and the engine room 50 does not. There is no danger of water infiltration, so there is no problem even if water leaks from the inspection port during normal sailing, not only during inspection work.

The rear main body 46 of the water jet propulsion device is made of metal such as aluminum as shown in the figure, and the front main body 111 is formed integrally when the FRP hull member 11 is formed. Because it is easy to manufacture and the front part of the main body is made of FRP, it is lightweight as a whole,
Furthermore, the inspection port main body can be formed integrally with the front main body 111 at the same time, and this is also easy to manufacture. In addition, if the cylindrical portion 60 is formed high so that the upper end flange 61 of the inspection port body 6 is higher than the water surface of the hull 10 at the anchoring state, the lid 7 can be opened even when the hull 1 is at an anchoring state. Can work. Further, the lid 7 is formed in a shape along the inner peripheral surface of the cylindrical portion 60, and the inner peripheral surface of the flow path 42 is formed by the lower surface of the bottom plate 74. If not, there is an advantage that the resistance of water in the flow path 42 does not increase.

In the second embodiment, the upper surface of the inspection port main body 6a is open on the rear deck 25, so that the inspection port is located on the water surface even when the ship is stopped. Accordingly, the ship can be stopped and inspection work can be performed. Further, since the opening of the inspection port body 6a is opened on the rear deck 25 and is separated from the inboard section by a watertight structure, even if water overflows from the inspection port, it will not enter the propulsion device installation section 40. Therefore, the partition 21a between the engine room 50 and the engine compartment 50 does not have to be watertight. Further, since the opening of the inspection opening is exposed outside the boat on the rear deck 25, opening and closing of a hatch cover and the like is not required at the time of inspection work, and the opening and closing of the inspection opening can be directly performed. Therefore, the inspection work can be easily performed.

[0026]

As described above, according to the present invention, since the inspection opening is opened on the rear deck, it is possible to easily open and close the lid during the inspection work. There is an advantage that there is no risk of water leaking into an engine room or the like even when water leaks from the opening of the inspection port.

[0027]

[0028]

[Brief description of the drawings]

FIG. 1 is a side view of a hull showing a preferred embodiment of the present invention, in which a rear portion of the hull is cut away and sectioned.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view showing the inside of the hull of FIG. 2;

FIG. 4 is an enlarged sectional view of a rear part of the hull of FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a side view of a hull showing another embodiment of the present invention.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is an enlarged sectional view of a propulsion unit installation section in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Hull 3 Operation handle 4 Water jet propulsion machine 5 Engine 6, 6a Inspection port main body 7, 7a Cover 10, 10a Cockpit 11 Hull member 12 Deck member 21 Watertight bulkhead 21a Partition wall 25 Rear deck 40, 40a Propulsion machine installation section 41 Water suction port 50 Engine room

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-85462 (JP, A) JP-A-4-66388 (JP, A) JP-A-4-80792 (JP, U) JP-A-49- 71991 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B63H 11/00-11/01 B63B 35/73

Claims (1)

(57) [Claims] In a water jet propulsion boat, the stern portion
A rear deck is formed, and a water suction port at the bottom of the stern
Propulsion by sucking water from the water and spraying it behind the stern
A water jet thruster is installed to generate
The water jet propulsion unit is driven in the inboard compartment in front of
Engine is installed, and the main body of the water jet thruster is
An inspection port for inspecting the inside of the flow path is formed.
Body penetrates the rear deck in a watertight structure
A watertight lid that can be opened and closed
The structure of the propulsion unit installation part of the water jet propulsion boat, characterized in that a water jet propulsion boat is mounted .