JP2003083189A - Small planing boat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small planing boat capable of dispensing with high corrosion-proof performance in a fuel tank, increasing a degree of freedom in layout of a fuel feed passage, and using a resin material visible from outside, in a fuel filter. SOLUTION: In this small planing boat comprising an engine with a fuel injector, and a water jet pump driven by the engine, and being propelled by the reaction generated in injecting the water pressurized and accelerated by the water jet pump from a rear injection port, a fuel pump for feeding the fuel to the fuel injection device is mounted outside a fuel tank, the fuel tank and the fuel pump, and the fuel pump and the fuel injection device are connected to each other respectively by the fuel feed passage, and the fuel filter is mounted in the fuel feed passage connecting the fuel tank and the fuel pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal watercraft (Personal Planing Boat) that jets a water stream backward and travels on the water by its reaction.
Watercraft (Personal Watercraft); PWC
(Also referred to as)), and particularly its fuel supply system (configuration).

[0002]

2. Description of the Related Art So-called jet propulsion type small planing boats have been widely used in recent years for leisure, sports or rescue. In this small planing boat, generally, water sucked from a water inlet provided on the bottom of the boat is pressurized and accelerated by a water jet pump and jetted backward to propel the hull.

Further, in the case of this jet propulsion type small planing boat, the steering nozzle arranged behind the jet port of the water jet pump is swung left and right by operating the bar type steering handle left and right, Steering the boat to the right or left by changing the direction of water injection to the left or right.

By the way, in the case of this small planing boat, there is a structure in which a fuel injection device which easily maintains a good combustion state is provided and the pressurized fuel is injected from the fuel injection device to the engine side. . Also, in this small planing boat,
A fuel pump that supplies fuel to a fuel injection device of a propulsion engine is arranged in a fuel tank in order to promote compactness.

Therefore, in such a structure, the fuel pump must have high corrosion resistance so as not to be corroded by contact with surrounding fuel or water accumulated in the fuel tank. . Therefore, the structure of the fuel pump becomes complicated and the price becomes expensive. In addition, pressure-resistant piping must be used in the fuel supply passage from the fuel pump to the fuel injection device of the engine, so that the flexibility is reduced, and as a result, the fuel supply passage from the fuel pump to the fuel injection device is routed. The degree of freedom of is limited. Specifically, it becomes impossible to arrange the narrow space in a bent state with a small bending radius. Further, although the fuel filter is installed somewhere in the fuel supply passage, dust and the like in the fuel pressurized by the fuel pump as described above are removed, and therefore the fuel filter itself. High rigidity is required, and therefore a metal casing has to be adopted from the viewpoint of strength, and as a result, the state of dust inside the fuel filter cannot be visually recognized from the outside.

The present invention has been made in view of such a situation, and it is possible to supply the fuel tank at a low cost without the need to impart high corrosion resistance to the fuel tank, and to provide a fuel supply passage from the fuel tank to the fuel pump. Provided is a small planing boat equipped with a fuel supply system capable of increasing the degree of freedom of handling and using a resin material visible from the outside in a fuel filter interposed in the fuel supply passage. The purpose is to

[0007]

The above-mentioned problems can be solved by a small planing boat having the following structure. That is, the small watercraft according to the first aspect of the present invention includes an engine equipped with a fuel injection device and a water jet pump driven by the engine, and supplies water pressurized and accelerated by the water jet pump. In a small planing boat configured to inject from a rear injection port and propel by reaction thereof, a fuel pump for supplying fuel to the fuel injection device is arranged outside the fuel tank, and the fuel tank and the fuel pump are connected to each other. And the fuel pump and the fuel injection device are connected by a fuel supply passage, and a fuel filter is interposed in the fuel supply passage that connects the fuel tank and the fuel pump.

According to the small planing boat constructed as described above, the fuel pump is located outside the fuel tank, so that the fuel pump is not exposed to the fuel and water in the fuel tank. It is not necessary to give the pump high corrosion resistance. Further, since the pressure from the fuel tank to the fuel pump is low, a highly flexible hose or the like can be used, and the degree of freedom in handling the fuel supply passage is increased. In particular, when the fuel pump is arranged in the vicinity of the fuel injection device of the engine, the length of the fuel supply passage on the low pressure side becomes long, so that a configuration in which the degree of freedom in handling the fuel supply passage is increased can be realized. Further, since the fuel filter is interposed in the fuel supply passage on the low pressure side, the pressure resistance performance can be lowered, so the fuel filter itself can be made of resin,
Therefore, when a transparent or translucent resin is used for the fuel filter, the dust collected inside the fuel filter can be visually recognized from the outside. Further, when cleaning and replacing the fuel filter, the fuel filter is to be removed from the fuel supply passage, but since the fuel supply passage has a low pressure, such a fuel filter can be easily attached and detached. .

In the small planing boat, the fuel injection device and the fuel tank are connected by a fuel return passage, and a pressure regulating valve is interposed between the fuel injection device and the fuel tank. Then, it is possible to realize a configuration in which the fuel supply pressure in the fuel injection device can be stably maintained constant.

In the small planing boat, when the fuel filter is arranged close to the opening of the engine room, the rider can easily visually check the clogging of the fuel filter for dust, and if it is clogged, clean it. And can be replaced.

In the small planing boat, if the fuel pump is arranged close to the fuel injection device, the fuel supply passage on the low pressure side is lengthened as described above, and the fuel supply passage is arranged. It becomes the structure which can improve the degree of freedom.

Further, in the small planing boat, when the fuel pump is arranged at a position substantially at the same height as the outlet of the fuel tank, the head pressure due to the difference in the positional height does not occur, and therefore the fuel is It is a structure that supports the fuel supply capacity of the pump.

Further, in the small planing boat, if the fuel pump is fixed inside the hull while being housed in a resin case, even if water splashes from the outside into the engine room, the fuel pump The pump is protected from corrosion.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a small planing boat according to an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an overall side view of a small planing boat showing a schematic configuration of a fuel supply system for a small planing boat according to an embodiment of the present invention in relation to an arrangement position in the small planing boat, and FIG. 1 is a block diagram showing the configuration of the fuel supply system shown in FIG. 1, FIG. 3 is an overall side view of a small planing boat according to an embodiment of the present invention, and FIG. 4 is a plan view of FIG.

In FIGS. 3 and 4, A is a hull, and this hull A is composed of a hull H and a deck D covering the hull H, and the connecting line connecting the hull H and the deck D over the entire circumference is a gunnel line. In this embodiment, this gunnel line G is located above the waterline L of the small planing boat.

As shown in FIG. 4, a portion of the deck D slightly rearward from the center is formed with a substantially rectangular opening 16 extending in the longitudinal direction on the upper surface of the hull A in plan view. As shown in FIG. 4, a seat S for riding is arranged above the opening 16.

The engine E is arranged in a space 20 having a "convex" cross section surrounded by the hull H and the deck D below the seat S. In this embodiment, the engine E
Is a multi-cylinder (four cylinders in this embodiment) four-cycle engine E, and as shown in FIG. 3, the crankshaft 26 is mounted so as to extend along the longitudinal direction of the hull A. An output end of the crankshaft 26 is integrally and rotatably connected to a pump shaft 21S side of the water jet pump P to which the impeller 21 is attached, via a propeller shaft 27. And this impeller 2
1, the outer periphery of which is covered with a pump casing 21C, takes in water taken from a water intake 17 provided on the bottom surface of a small planing boat through a water absorption passage, and pressurizes and accelerates with a water jet pump P. Pump nozzle (spouting portion) 21 whose cross-sectional area of water flow becomes smaller toward the rear
It is configured to pass through R and discharge from the injection port 21K at the rear end to obtain a propulsive force.

Further, in FIG. 3, 21V is a vane for rectifying the water passing through the water jet pump P. Further, in FIGS. 3 and 4, reference numeral 24 is a bar type steering handle, and by operating the handle 24 to the left and right, a cable 25 shown by a chain line in FIG.
Steering nozzle 18 behind the pump nozzle 21R
Is oscillated to the left and right so that the boat can be steered in a desired direction when the water jet pump P is in operation.

Further, as shown in FIG. 3, a bowl-shaped reverse deflector 19 is provided above and behind the steering nozzle 18 so as to be pivotable downward about a pivot shaft 19a arranged horizontally. By oscillating the deflector 19 to the lower position behind the steering nozzle 18, the water discharged rearward from the steering nozzle 18 is turned forward and can be moved backward.

3 and 4, reference numeral 22 denotes a rear deck, which is provided with an opening / closing hatch cover 29, and a storage box having a small capacity is formed below the hatch cover 29. There is. Further, in FIG. 3 or 4, reference numeral 23 denotes a front hatch cover, and a box (not shown) for accommodating equipment and the like is provided below the hatch cover 23.

By the way, the small planing boat according to the embodiment of the present invention is equipped with a fuel supply system as shown in FIG. That is, as shown in FIG. 1, the fuel pump 1 is arranged outside the fuel tank 2, that is, the fuel pump 1 is a resin casing attached to the inside of the hull in the engine room Rm. It is located within 8.
The fuel pump 1 and the fuel tank 2 are connected by a fuel hose 3A forming a low pressure fuel supply passage 3. A fuel filter 4 is interposed in the fuel supply passage 3. In this embodiment, the fuel filter 4 has a casing 4A made of a semitransparent resin so that dust inside can be visually confirmed. Also,
In this fuel filter 4, a filter body 4B made of filter paper is arranged inside the translucent resin casing 4A. That is, the fuel from the fuel tank 2 is supplied to the outer peripheral region of the filter body 4B of the fuel filter 4 and taken out from the inner peripheral portion of the filter body 4B, so that dust and the like existing in the fuel can be removed. It is configured. Therefore, the filter body 4B
The removed dust accumulates on the outer peripheral wall surface of, and the accumulation state of dust can be visually recognized from the outside. Of course, if the casing 4A of the fuel filter 4 is made of a transparent resin, it is preferable because the dust accumulation state can be more easily visually recognized. In this embodiment, the fuel pump 1 is arranged close to the engine E, and a fuel supply passage on the high pressure side is formed from the fuel pump 1 to the fuel injection device (fuel injector) Ij of the engine E. To do
The fuel is supplied through a three-ply high pressure fuel hose 5. The fuel injection device Ij and the fuel tank 2 are connected by a fuel hose 6 that forms a fuel return passage, and in the middle of the fuel hose 6,
A pressure regulating valve (pressure regulator) 7 is provided. Therefore, as the fuel hose 6 between the fuel injection device Ij and the pressure adjusting valve 7, a 3-ply high-pressure fuel hose 6A is used, and the fuel hose between the pressure adjusting valve 7 and the fuel tank 2 is used. A low-pressure fuel hose 6B is used for 6. Therefore, if the pressure regulating valve 7 is arranged in the vicinity of the engine E, the length of the low pressure fuel hose 6B becomes long and the flexibility of the fuel return passage on the low pressure side becomes good. The degree of freedom in handling the fuel return passage can be increased. Further, as shown in FIG. 1, the fuel pump 1 is arranged at substantially the same height as the outlet of the fuel supply passage 3 connected to the fuel tank 2. The series of fuel supply systems described above can be illustrated in a simplified block diagram as shown in FIG.

Therefore, the present small-sized planing boat configured as described above can achieve the following actions.
That is, since the fuel pump 1 is provided outside the fuel tank 2, the fuel pump 1 is not corroded by the fuel and water in the fuel tank 2. Therefore, it is not necessary to give the fuel pump 1 high corrosion resistance. Further, if the fuel pump 1 itself is housed in the resin casing 8 as in this embodiment, even if water (seawater) or the like is scattered from the outside into the engine room Rm, the fuel pump 1 1 does not corrode with them. When the fuel pump 1 is arranged in the vicinity of the engine E, the fuel hose 3A forming the low pressure fuel supply passage 3 becomes long and has good flexibility. The degree of freedom increases and handling becomes easier. Further, similarly, by disposing the pressure adjusting valve 7 near the engine E, it becomes easy to arrange the fuel return passage on the low pressure side. Specifically, when the handling becomes easy, the fuel supply passage 3 or the low-pressure fuel hose 6
Since B can be bent as necessary, the fuel pump 1, the fuel filter 4 or the pressure adjusting valve 7 can be freely arranged in the empty space of the engine room Rm, and periodical inspection and replacement are possible. It becomes possible to arrange the fuel filter 4, which is required, etc., at an optimum position without being restricted by the bendability of the fuel supply passage 3. Further, when the pressure adjusting valve 7 is provided in the fuel hose 6 as in this embodiment, the fuel supply pressure to the fuel injection device Ij can be stably maintained at a constant value, which is favorable. It is possible to inject a predetermined amount of fuel in such a state. Further, since the fuel filter 4 is arranged in the low-pressure fuel supply passage 3, the fuel filter 4 itself can be made of resin, and if necessary, an openable / closable lid can be attached to the fuel filter 4 with a screw or the like. By providing, only the internal filter body 4B can be replaced and can be cleaned.

By the way, in the above embodiment, the fuel hose 3A, the fuel hose 5, and the fuel hoses 6A, 6B constituting the fuel supply passage 3 are made of flexible fuel hoses such as rubber. These passages can be formed by a pipe made of a rigid body, and in particular, it is also practical to form the fuel supply passage on the high pressure side and the fuel return passage on the high pressure side by pipes in order to improve pressure resistance and heat resistance. It becomes an embodiment.

In the above embodiment, the present invention has been described by taking the case of a 4-cycle engine as an example, but it goes without saying that the present invention can also be applied to the case of a 2-cycle engine.

[0026]

According to the present invention, it is not necessary to impart high corrosion resistance to the fuel pump, and the fuel filter can be made of resin. Further, since the pressure of the fuel supply passage from the fuel tank to the fuel pump can be made low, the degree of freedom in arranging the fuel supply passage in this portion is increased, and the arrangement positions of the fuel pump and the fuel filter can be freely set. In addition, the fuel filter can be made of a transparent or translucent resin, and if the fuel filter is made of a transparent or translucent resin in this way, the dust accumulated inside can be visually recognized from the outside. realizable.

[Brief description of drawings]

FIG. 1 is an overall side view of a small planing boat showing a schematic configuration of a fuel supply system for a small planing boat according to an embodiment of the present invention in relation to an arrangement position in the small planing boat.

FIG. 2 is a block diagram showing a configuration of the fuel supply system shown in FIG.

FIG. 3 is an overall side view of a jet propulsion type small planing boat according to an embodiment of the present invention.

4 is an overall plan view of the small planing boat shown in FIG.

[Explanation of symbols]

1 ... Fuel pump 2 ... Fuel tank 4 ... Fuel filter 3 ... Fuel supply passage (low-pressure side fuel supply passage) 5 ... Fuel hose (high-pressure side fuel supply passage)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 37/04 F02M 37/04 A 37/22 37/22 L

Claims (7)

[Claims] 1. An engine provided with a fuel injection device, and a water jet pump driven by the engine, wherein water pressurized and accelerated by the water jet pump is injected from a rear injection port and its reaction is caused. A small planing boat configured to be propelled by a fuel pump, the fuel pump supplying fuel to the fuel injection device is arranged outside the fuel tank, and between the fuel tank and the fuel pump and between the fuel pump and the fuel injection device. A small planing boat, characterized in that a fuel filter is interposed in a fuel supply passage connecting the fuel tank and the fuel pump. 2. The small gliding according to claim 1, wherein at least a portion of the fuel filter that is visible from the outside is transparent or translucent so that the accumulation state of dust or the like can be visually recognized from the outside. Boat. 3. The fuel injection device and the fuel tank are connected by a fuel return passage, and a pressure adjusting valve is interposed between the fuel injection device and the fuel tank. Or the small planing boat described in 2. 4. The fuel filter is arranged close to an opening of an engine room.
The small planing boat according to any one of 1 above. 5. The small planing boat according to claim 1, wherein the fuel pump is arranged close to the fuel injection device. 6. The small planing boat according to claim 1, wherein the fuel pump is arranged at substantially the same height as the outlet of the fuel tank. 7. The fuel pump is fixed in a hull while being housed in a resin case.
The small planing boat according to any one of 1 to 6.