JP2725129B2 - Air intake passage for personal watercraft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake passage for guiding air to an intake pipe which penetrates a deck of a personal watercraft and communicates with the inside of a hull.

[0002]

2. Description of the Related Art As a personal watercraft, it runs around the coastal area mainly for leisure or sports while riding at the rear of a deck and gripping and steering a handle (usually a bar handle) arranged on the upper front of the hull. The type is used. This type of personal watercraft is configured to drive a propulsion device mounted on the rear of the hull by an engine mounted inside the hull, and to steer while changing the thrust direction of the propulsion device.

[0003] A water injection device or the like is used as the propulsion device, and the water injection device obtains thrust by jetting water sucked from the bottom of the ship backward by a jet pump. In the case of this water injection device, usually, the steering is performed by changing the direction of the water injection duct. The propulsion unit is mounted in a lower open recess formed in the rear of the hull, and the recess is covered with a cover substantially coinciding with the bottom surface of the hull.

In the personal watercraft described above, it is necessary to introduce air from the outside into the interior of the hull in which the engine is mounted (or an engine room formed in the interior of the hull). Is provided to guide air to an intake pipe that penetrates through a predetermined position of the hull and communicates with the inside of the hull. In a personal watercraft that travels while splashing water, water easily enters the hull together with air. Therefore, it is required to reduce the invasion of water by performing gas-liquid separation in an intake passage. A related application is Japanese Utility Model Laid-Open No. 2-105095.

[0005]

However, it is difficult to form a maze structure on the deck in the intake passage of the conventional personal watercraft, so that the gas-liquid separation is insufficient and the intake noise is insufficiently reduced. May be.

The present invention has been made in view of such prior art, and an object of the present invention is to configure an intake passage having a gas-liquid separation function with a simple and compact structure integrated with a hatch cover. It is an object of the present invention to provide an air intake passage for a personal watercraft that can perform sufficient gas-liquid separation to effectively reduce water intrusion and reduce intake noise.

[0007]

SUMMARY OF THE INVENTION The present invention penetrates a hatch cover, which can be opened and closed to seal a working opening formed in a deck, and a deck, and communicates from the space on the deck to the interior of the hull. An intake passage for guiding air to the intake pipe of the personal watercraft having an intake pipe, comprising a cover cap and a partition member attached to an overhang formed in the hatch cover, wherein the cover cap is provided with the hatch; The cover has a housing shape with an open bottom surface that covers the space on the deck when the cover is closed, and an outside air inlet for introducing outside air is formed on a side surface of the cover cap. A member disposed inside, before and after facing the outside air inlet with a predetermined gap suitable for gas-liquid separation of the outside air introduced from the outside air inlet A horizontal partition wall connected to a rear end of the front-rear partition wall, and a bottom plate-shaped base portion connecting a lower edge of the front-rear partition wall and a lower edge of the horizontal partition wall. The outside air flowing from the outside air inlet is caused to strike against the front-rear direction partition wall, thereby performing gas-liquid separation and diffusing into the inside of the cover cap, and separating the separated air at the position below the cover cap. The object is achieved by guiding the water to the inlet of the pipe and discharging the separated water to the outside of the ship through a gap between the lower peripheral edge of the cover cap and the deck.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a right side view showing an embodiment of a personal watercraft provided with an intake passage to which the present invention is applied, and FIG. 2 is a plan view of the personal watercraft of FIG. 1 and 2, the hull is constituted by a hollow body in which a deck 1 and a hull 2 are joined by flange portions 3 and 4 around each of them. The deck 1 and the hull 2 are usually made of a plastic molded product (including a plastic containing reinforcing fibers). An engine 6 (FIG. 1) is mounted on a forward portion inside the hull, and the engine 6 drives a propulsion device 8 (FIG. 1) mounted on the rear of the hull via a drive shaft 7 (FIG. 1). The engine 6
It is mounted in the hull or in an engine room formed by partitioning the hull. In this embodiment, a jet pump is used as the propulsion device 8.

A rear portion of the deck 1 is an area where a pilot rides, and a central portion of the rear portion of the deck has a protruding portion 9 extending forward and backward.
A seat 10 for seating is formed on the upper surface of the protrusion 9.
Is installed. The saddle-shaped seat 10 has a structure in which about one or two passengers besides the driver can ride side by side. A pilot riding on the rear of the deck 1 controls the steering wheel (bar handle) 11 disposed on the deck 1 by gripping both grip portions at both ends. In the illustrated example, a central portion of the handle 11 is covered by a handle cover 12.

On both sides of the projecting portion 9 (seat 10) of the deck 1, there are formed steps 13, 13 on which the rider places his / her feet. The dashed line W in FIG. 1 illustrates the water surface when the boat is stopped, and the dashed line X in FIG. 1 illustrates the waterline (water surface) during cruising (during gliding). The rider puts his feet on the steps 13 and 13 on both sides and gets on the boat in a standing posture or a posture sitting on the seat 10, and the driver grips the grip portion of the steering wheel 11 and steers. The propulsion device sucks water from a suction port 15 (FIG. 1) formed in the ship bottom 14 by a jet pump 8 driven by the engine 6, and sends the water backward from the stern 16 (from the duct of the propulsion device 8). It has a structure to get thrust by spouting.

On the deck 1, there is a handle tower cover 1
7 and a hatch cover 18 are attached. The handle tower cover 17 is for covering a steering (steering) mechanism provided through the deck 1. The handle cover 12 is attached to the steering mechanism so as to be able to rotate (steer) together with the handle 11. The deck 1 is provided with a working opening 19 (FIG. 2) for supplying fuel to a fuel tank (not shown) mounted inside the hull or for checking the engine 6 and the like. This is for sealing the work opening 19 so that it can be opened and closed freely.

In FIG. 1 and FIG. 2, the hatch cover 18 has a hinge 20 at its front end with respect to the deck 1.
Is attached so as to be openable and closable in the direction of the double arrow A via the arrow. A cover cap (cover member) 21 is provided on a rear end portion of the hatch cover 18 (a protruding portion opposite to the hinge 20).
Is fixed, and an intake passage according to the present invention is formed between the cover cap 21 and the upper surface of the deck 1, that is, inside the cover cap 21.

FIG. 3 is a longitudinal sectional view showing an embodiment of the intake passage to which the present invention is applied, and FIG. 4 is a transverse sectional view taken along line 4-4 in FIG. 3 and 4, an overhang portion 22 is formed at the rear end of the hatch cover 18, and the overhang portion 22 has the cover cap (cover member) 2 formed thereon.
1 and a partition member 23 is fixed by bolts and nuts 24. The cover cap 21 is fixed by an arm 25 integrally formed on the inner surface thereof. The partition member 23 is fixed so as to be housed inside the cover cap 21.

FIG. 5 is a perspective view of the cover cap 21, and FIG. 6 is a perspective view of the partition member 23. FIG.
5 to 5, the cover cap 21 has a substantially gate-shaped cross section, and a predetermined gap A (FIG. 4) is provided between the lower end edges of both sides thereof and the surface of the deck 1. The front end opening is covered by the rear end of the hatch cover 18, and most of the rear end opening is formed by the front wall 2 of the handle tower cover 17.
6. And this cover cap 2
An outside air inlet 27 for taking in outside air is formed on one side surface (side surfaces on both sides in the illustrated example).

As shown in FIG. 6, the partition member 23 has a left-right longitudinal partition wall 28, a horizontal partition wall 29, and a base 30.
The base 30 is fixed to the overhang 22 (FIGS. 3 and 4). Then, this partition member 23 is provided as shown in FIG.
As shown in FIG. 4, the outside air (arrow B in FIG. 4) entering from the outside air inlets 27, 27 is assembled in such a positional relationship as to strike the front-rear partition walls 28, 28. That is, when the personal watercraft travels, water may enter along with the air from the outside air inlets 27, 27.
8 so as to perform gas-liquid separation (separation into air and water). The distance C (FIG. 4) between the front-rear direction partition wall 28 and the outside air inlet 27 is
A value such that the gas-liquid separation is sufficiently performed, for example, about 2c
It is set to about m to 12 cm.

3 and 4, the lower side of the cover cap 21 is open to the surface of the deck 1 except for the base 30 and the overhang portion 22 of the partition member 23. In this embodiment, the partition member 2
3 (particularly the horizontal partition wall 29) and the front wall portion 26 of the handle tower cover 17 are assembled at a predetermined distance D (FIG. 3). Further, a space E is provided between the front end of the handle tower cover 17 and the surface of the deck 1, and a gap F (see FIG. 4) is provided.

3 and 4, the deck 1 penetrates the front and back of the deck 1 at a position near the cover 1 below the cover cap 21 (in the illustrated example, below the front end of the handle tower cover 17). , Engine 6 inside the hull
Two intake pipes 31, 32 (FIG. 3) communicating with the mounting space (or engine room) are fixed. Although two intake pipes 31 and 32 are provided in the present embodiment, one or three or more intake pipes may be provided. In addition, these intake pipes 3
1, 32 can be used for ventilation inside the hull in addition to the engine air supply.

The operation of the intake passage of the personal watercraft described above is as follows. When the engine 6 is started, outside air is taken into the cover cap 21 in the direction of arrow B from the outside air inlets 27, 27. The introduced outside air first strikes the front-rear partition walls 28, 28 of the partition member 23, where the flow direction is changed.
The direction is changed in the direction along the direction 8 (direction substantially perpendicular), and further diffused into the cover cap 21. When water invades with the outside air, it is efficiently separated into air and water by the gas-liquid separation action at the time of the direction change and diffusion.

The separated water is applied to the front and rear partition walls 2.
After flowing along the surfaces of the decks 8 and 28, it is dropped on the surface of the deck 1 and further flows along the surface of the deck.
Through the vessel to the outside. On the other hand, the separated air reaches the surface of the deck 1 through the lower open surface of the cover cap 21 while being rectified by the surfaces of the front-rear partition walls 28, 28. Of the intake pipes 31 and 32 fixed to the deck 1 through the gap (interval E) at the front end. Then, the air is introduced into the engine 6 mounting space inside the hull through the intake pipes 31 and 32.

According to the embodiment described above, the following effects can be obtained. First, an intake passage for guiding gas-liquid separated air to an intake pipe leading to the inside of the hull has a cover cap 21 of a hollow casing attached to the hatch cover 18 on the deck 1 and a partition fixed inside the cover cap. Member 23
Therefore, an intake passage having a gas-liquid separation function with a simple and compact structure integrated with the hatch cover 18 can be formed. Secondly, the inflowing outside air hits the partition walls 28 and turns around 90 degrees and is diffused in the cover cap 21, so that even when water enters with the air, these can be efficiently separated. In addition, the gas-liquid separation can be sufficiently performed to effectively reduce the intrusion of water into the hull and reduce the intake noise. Thirdly, the separated water can be dropped on the surface of the deck 1 from the partition walls 28, 28 and immediately discharged from the gaps A, A on both sides, and the intrusion of water into the hull can be reduced as much as possible. . Fourth, the separated air is straightened along the partition walls 28, 28, and the intake pipes 31,
32, it is possible to perform efficient intake and prevent generation of intake noise and resonance noise. Fifth, since the outside air inlets 27, 27 are arranged on the side surfaces of the cover cap 21, an intake passage that can sufficiently withstand the frontward impact of waves during cruising is obtained.

In the above embodiment, the overhang portion 22 is provided.
, The cover cap (cover member) 21 and the partition member 23 are directly fastened, but the rubber-like elasticity is provided between the overhang portion 22 and the cover cap 21 or between the cover cap 21 and the partition member 23. If a vibration absorbing member such as a body is attached and fastened, the resonance noise and the intake noise of the cover cap 21 or the partition member 23 can be further reduced. Further, in the above embodiment, the outside air inlets 27 are provided one by one on both sides of the cover cap 21. However, they may be provided only on one side, or may be provided at a plurality of locations. Further, a lattice, a mesh, a rectifying blade, or the like may be provided at the outside air inlet. Further, in the above-described embodiment, the cover cap 21 as a separate member is fixed to the hatch cover 18, but these may be formed as a single member by integral molding.

In the illustrated embodiment, a personal watercraft having a saddle-shaped seat 10 in the center of the rear portion of the deck 1 has been described as an example. However, the intake passage according to the present invention is provided on both sides of the rear portion of the deck. The same applies to small planing boats that have a protruding fin section and form a riding floor between which passengers can enter, or a small planing boat that forms the rear of the deck with a simple flat riding surface. The same operation and effect can be obtained.

[0023]

As is apparent from the above description, according to the present invention, a hatch cover which is openably and closably attached to seal a work opening formed in the deck and a space on the deck which penetrates the deck. An air intake passage for guiding air to the air intake pipe of a personal watercraft having an air intake pipe communicating with the inside of the hull, a cover cap and a partition member attached to an overhang formed in the hatch cover; The cover cap has a housing shape with an open bottom surface that covers a space above the deck when the hatch cover is closed, and an outside air inlet for introducing outside air to a side surface of the cover cap is formed, The member is a member disposed inside the cover cap, and has a predetermined gap suitable for gas-liquid separation of the outside air introduced from the outside air inlet. A front-rear partition wall facing the outside air inlet, a horizontal partition wall connected to a rear end of the front-rear partition wall, and a lower edge of the front-rear partition wall and a lower edge of the horizontal partition wall are connected. A bottom plate-shaped base portion, and performs gas-liquid separation by abutting outside air flowing from the outside air inlet against the front-rear direction partition wall and diffuses the inside of the cover cap, and separates the separated air below the cover cap. The liquid is guided to the inlet of the intake pipe fixed at a position, and the separated water is discharged to the outside of the ship through a gap between the lower peripheral edge of the cover cap and the deck. The intake passage for guiding air is composed of a cover cap and a partition member attached to the hatch cover, making it easy and compact to integrate into the hatch cover An intake passage having a gas-liquid separation function can be configured with a structure.Also, the outside air flowing in from the side surface of the cover cap is abutted against the front-rear partition wall from a substantially right angle direction to separate gas and liquid, and inside the cover cap. Because of the diffusion, there is provided an intake passage of a personal watercraft that can sufficiently perform gas-liquid separation to effectively reduce water intrusion and reduce intake noise.

[Brief description of the drawings]

FIG. 1 is a right side view showing an embodiment of a personal watercraft equipped with an intake passage to which the present invention is applied.

FIG. 2 is a plan view of the personal watercraft of FIG.

FIG. 3 is a longitudinal sectional view showing an embodiment of an intake passage of the personal watercraft according to the present invention.

FIG. 4 is a cross-sectional view of the intake passage taken along line 4-4 in FIG. 3;

FIG. 5 is a perspective view of a cover member (cover cap) in FIG. 3;

FIG. 6 is a perspective view of a partition member in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deck 2 Hull 6 Engine 7 Drive shaft 8 Propulsion unit 9 Projection part 10 Seat 11 Handle 13 Step 17 Handle tower cover 18 Hatch cover 19 Work opening 20 Hinge 21 Cover member (Cover cap) 22 Projection part (Hatch cover) 23 Partition Member 26 Front wall portion (handle tower cover) 27 Outside air inlet 28 Front-rear partition wall 29 Lateral partition wall 30 Base 31 Intake pipe 32 Intake pipe A Clearance between cover member side end and deck C Space between partition wall and outside air inlet D Distance between partition wall and handle tower cover E Distance between front end of handle tower cover and deck F Clearance between handle tower cover side end and deck

Claims (1)

(57) [Claims] A work opening (19) formed in a deck (1).
Air to the intake pipe of a personal watercraft having a hatch cover 18 that is openably and closably attached to hermetically seal and intake pipes 31 and 32 that penetrate through the deck 1 and communicate from the space on the deck to the interior of the hull. A cover cap 21 and a partition member 23 attached to an overhang 22 formed in the hatch cover 18 in an intake passage for guiding
The cover cap 21 has a bottom open shape that covers a space on the deck when the hatch cover 18 is closed, and an outside air inlet 27 for introducing outside air to a side surface of the cover cap is formed. The partition member is a member arranged inside the cover cap 21, and is a front-rear direction facing the outside air inlet 27 with a predetermined gap suitable for separating the outside air introduced from the outside air inlet 27 into gas and liquid. A partition wall 28, a horizontal partition wall 29 connected to the rear end of the front-rear partition wall 28, and a bottom plate-shaped base portion connecting the lower edge of the front-rear partition wall and the lower edge of the horizontal partition wall 30 to perform gas-liquid separation by abutting the outside air flowing from the outside air inlet 27 against the front-rear direction partition wall 28 and the inside of the cover cap 21. Is diffused, the intake pipe 31 that is fixed to the lower position of the cover cap 21 separated air,
32, and the separated water is supplied to the cover cap 21.
An air intake passage for a personal watercraft, wherein the air is discharged to the outside of the ship through a gap between a lower edge portion of the lower deck and the deck 1.