JP3050244B2 - Small planing 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 personal watercraft, and more particularly, to a personal watercraft equipped with a muffler on the outer stern of a hull.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a personal watercraft in a conventional example. In FIG. 3, reference numeral 1 denotes a boat body. An engine 5 as a propulsion power source is disposed in the rear portion of the boat main body 1. The exhaust side of the engine 5 includes an exhaust manifold 8, a primary muffler 14, a secondary muffler 15, and an exhaust pipe 16. The exhaust system is connected sequentially. An intake duct 12 for absorbing water and an impeller housing 1 for generating a water jet are provided on the bottom of the main body adjacent to the engine.
And a nozzle 3 for converging the water jet flow . A deflector 11 is provided below the stern outside to change the direction of the jet flow by applying the jet flow and to make the boat reverse.

Next, the operation of the above conventional example will be described.
In FIG. 3, an impeller (not shown) in an impeller housing 13 is driven to rotate by the engine 5, so that a propulsion medium such as seawater 19 is supplied to the intake duct 1.
2, pressurized and converged by the nozzle 3
Discharge as a water jet flow. As a result, the propulsion of the boat is obtained. Further, the exhaust of the engine 5 passes through the exhaust manifold 8, and the primary muffler 1
4. The sound is successively silenced through the secondary silencer 15 and guided to the exhaust pipe 16 to be exhausted from the exhaust port 16a.

[0004]

However, in the above-mentioned conventional example, it is necessary to house the above-mentioned engine section in a small hull with a limited storage space. For this reason, the component mounting density of the storage section in the ship increases,
Work such as removal and connection piping are complicated. Therefore, the layout is difficult to work, for example, a maintenance opening is required in the hull.

[0005] Also, from the space of the storage section in the ship,
In particular, the capacity of the silencer requiring a large volume may not be set to a sufficient size. For this reason, there is a means such as relocating the silencer from the inside of the hull to the outside stern. However, when the occupant 14 gets into the ship from the seawater 19, he enters the stern and is heated by the engine exhaust. When the muffler is disposed at the stern, there is a problem that the occupant 14 comes into contact with the high-temperature muffler, and the muffler cannot be moved outside.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a personal watercraft in which the disadvantages of the prior art are improved, and in particular, the function of the silencer is improved and the complexity of the engine mounting section is reduced.

[0007]

SUMMARY OF THE INVENTION A water jet propulsion engine having an engine section and a nozzle section and a jet nozzle are provided .
And a deflector disposed facing the water jet propulsion engine in the hull and having a muffler mounted on the exhaust side of the engine. In addition to providing cooling water introduction means on the exhaust side,
The muffler is located on the outer side of the stern and includes the nozzle and the deflector.
It is arranged above the data . With these, the above-mentioned object is to be achieved.

[0008]

The high pressure water for cooling is introduced into the exhaust manifold on the engine exhaust side from the nozzle through the cooling water introducing means, thereby lowering the temperature on the engine exhaust side and reducing noise.

[0009]

First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an overall perspective view of a personal watercraft according to this embodiment. In FIG. 1, reference numeral 1 denotes a personal watercraft body, and reference numeral 2 denotes a muffler arranged at the stern. FIG. 2 shows a hull sectional view of the present embodiment. FIG.
In the hull, an exhaust manifold 8, a primary silencer 9, and a connecting pipe 10 are sequentially connected to an engine exhaust side of an engine 5 as a propulsion power source. The silencer 2 arranged at the stern is connected to the connecting pipe 1 via the hull.
0 is connected.

On the other hand, the engine 5 and the intake duct 12 for water in the bottom of the unit adjacent the impeller housing 13 for waterjet <br/> generation, and the nozzle 3 of the water jet stream <br/> for convergence Each is arranged. Also,
A cooling water inlet 6 is provided at a predetermined position on the inner wall surface of the nozzle 3, and a cooling water inlet pipe 4 is connected from the cooling water inlet 6 to an exhaust manifold 8.

Next, the operation of the above embodiment will be described. In FIG. 2, an impeller (not shown) in an impeller housing 13 is driven to rotate by the engine 5, thereby sucking a propulsion medium such as seawater 19 from the intake duct 12 and pressurizing the suction medium to provide the impeller at the end. The nozzle 3 converges, and is discharged to the outside as a water jet stream. Further, high-pressure water 7 in the nozzle 3 flows from a cooling water inlet 6 disposed at a predetermined position on the inner wall surface of the nozzle 3, and flows into the exhaust manifold 8 in the direction A on the engine exhaust side by the cooling water inlet pipe 4. It is led.
At this time, the high-pressure water 7 introduced into the exhaust manifold 8 is jetted by a nozzle (not shown) provided in the exhaust manifold 8 into predetermined water particles in the exhaust direction.

The high-pressure water 7 jetted into the exhaust manifold 8
Reduces the temperature around the exhaust side while moving to the primary silencer 9 together with the exhaust flow, and reduces noise. For this reason, the heating of the exhaust-side upstream portion is prevented by spraying the high-pressure water 7, so that the temperature of the exhaust-side downstream portion can be significantly reduced. The high-pressure water 7 is provided under the primary silencer 9.
a temporarily stops, but the connecting pipe 10
To the secondary silencer 2 provided at the stern through
It is discharged outboard from the exhaust port 2a together with the exhaust gas.

Here, in the above-described embodiment, the one having the primary muffler 9 and the secondary muffler 2 has been described. However, the present invention is not limited to this, and the primary muffler 9 may be omitted. .

[0014]

As described above, according to the present invention, the war
The cooling water introduction means is provided from the nozzle of the jet propulsion engine to the exhaust side of the engine, and the muffler is arranged at the stern, so that the heating of the upstream side of the engine exhaust side is prevented. Therefore, the temperature of the downstream portion on the exhaust side can be significantly reduced. For this reason, the secondary silencer can be relocated to the stern used when the occupant enters the ship from seawater. Therefore, the silencer can be arranged outside the ship, which can take up a lot of space, so that the capacity of the silencer can be sufficiently secured and the silencing function can be improved. In addition, by adopting a shape that covers the upper part of the conventionally equipped propulsion engine member, the silencer provided at the stern is a substantially rectangular parallelepiped,
It can be effectively used as a springboard for definitive at the time of the ship boarding of passengers. Furthermore, it provides an unprecedented excellent personal watercraft that can reduce the complexity of the onboard engine mounting section, achieve a layout with good workability, and divert the vacant space to other use spaces. can do.

[Brief description of the drawings]

FIG. 1 is a perspective view of a personal watercraft according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating the embodiment of FIG.

FIG. 3 is a cross-sectional view illustrating a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 The personal watercraft body as a hull 2 Secondary muffler 3 Nozzle as a nozzle part 4 Cooling water introduction pipe as a cooling water introduction means 5 Engine as an engine part 6 Cooling water introduction port as a cooling water introduction means 20 water jet Promotion agency

Claims (2)

(57) [Claims] 1. A War with an engine portion and a nozzle portion
Installed facing the jet propulsion engine and the jet nozzle
A deflector and the waterjet propulsion engine in the hull, and a personal watercraft equipped with a secondary silencer mounted on an exhaust side of the engine unit, wherein the jet nozzle unit is disposed on an exhaust side of the engine unit. Cooling water introduction means is provided, and the secondary silencer is
A personal watercraft, wherein the personal watercraft is disposed above the nozzle portion and the deflector . 2. The small-sized slide according to claim 1, wherein the secondary silencer is a substantially rectangular parallelepiped, and the upper surface of the secondary silencer is disposed horizontally on the outer side of the stern. Boat.