JPS5842606Y2 - Outboard motor fuel leak prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel leakage prevention device for an outboard motor.

More specifically, it is installed on the carburetor suction side of an outboard motor to prevent fuel from leaking to the outside during tilt-up, such as shallow water navigation required for the operation of the outboard motor, and restraint when not in use. This invention relates to a fuel leakage prevention device for outboard motors that contributes to effective use of fuel and improved safety of outboard motors.

Outboard motors are used as propulsion devices for boats on the ocean where the air is relatively clean, and due to space constraints, an intake system that does not use an air cleaner is often adopted.

Therefore, the intake port of the carburetor is directly opened inside the engine cover, sucks in outside air, mixes fuel and air to obtain a mixture, and supplies this to the internal combustion engine.

On the other hand, when operating an outboard motor, there is a tilt-down operation for normal propulsion, and when propelling in shallow water, the screw is tilted to prevent the screw from coming into contact with the seabed, etc. It has three operating positions: tilt-up operation, and tilt-up holding to lift the outboard motor out of the water when it is completely stopped and at anchor.

In such outboard motors, when operating in shallow water or tilting up when the operation is stopped, the horizontally installed carburetor tilts with the inlet facing downward, resulting in fuel leaking from the carburetor inlet to the outside and damaging the surrounding area. or collect on the bottom of the ship and contaminate it.

Furthermore, if there is fire around the leaked fuel, there is a risk of ignition, which is unfavorable in terms of fire prevention and safety of outboard motor operation.

Furthermore, there is the problem that leaked fuel contaminates the water surface, and fuel leakage is also unfavorable from the point of view of fuel economy.

The inventors of the present invention have devised the present invention in view of the above-mentioned problem of fuel leakage in outboard motors.

The purpose of the present invention is to install an elbow-shaped leakage prevention device main body with an upwardly opened end to the intake port of the carburetor in an outboard motor that uses a bare carburetor, and to install an elbow-shaped leakage prevention device main body with an upwardly opened end inside the main body. A substantially horizontal projecting wall with a planar U shape is provided in the section, and a space is formed between the lower surface of this projecting wall and the bottom surface of the case to serve as a leakage fuel storage section, and the fuel leaking from the carburetor when the outboard motor is tilted up is stored in the storage section. To provide a fuel leakage prevention device for an outboard motor in which fuel is stored in a section.

It is also an object of the present invention to provide a fuel leakage prevention device that prevents leakage of fuel to the outside, prevents pollution, improves the safety of outboard motors, and is preferable in terms of fuel economy. It is effective simply by attaching the shaped body to the carburetor inlet side, has a simple structure and is inexpensive, and can be easily implemented on existing outboard motors without making any special changes to the carburetor. To provide a fuel leakage prevention device for an outboard motor.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway side view of the device of the present invention as it is attached to a carburetor, and FIG. 2 is a plan view thereof.

Reference numeral 1 denotes a carburetor, to which a fuel leak prevention device 10 (to be described later) is connected to the front end of the carburetor on the suction port 2 side, and an intake manifold 3 is connected to the discharge side of the carburetor, and the intake manifold 3 is connected to the intake port of an internal combustion engine (not shown). ing.

The main body of the device 100 is made of plastic and is formed into an elbow shape.

The elbow-shaped main body 11 has a base opening 12 formed in the horizontal direction.
and a tip opening 13 that opens diagonally upward at an angle of 900 degrees or more.

These parts are integrally connected by a base cylindrical part 11a extending in the horizontal direction, and a tip part cylindrical part 11b continuous with this and extending diagonally upward, and the above-mentioned parts are integrally molded.

Suction ports 2 of the carburetor 1 are provided on both sides of the base cylindrical portion 11a.
A mounting part 15 is formed with screw holes 14, 14 on the left and right sides for connecting the main body 11 with screws 4, 4 to the peripheral end surface, and a mounting flange part 16 is formed at the base of this part. A link-shaped sealing member 5 is inserted between the end face and the peripheral end face of the carburetor intake port 2 to seal the connection portion.

Recesses 17 are provided on the left and right inner circumferences of the base opening 12 of the main body 11.
, 17 are formed.

A fuel storage protrusion 18 is integrally molded on the front inner wall of the tip cylindrical portion 11b, which is bent and extended upward from the main body 11, in a direction substantially parallel to the base portion 11a and in a substantially horizontal direction toward the base opening 12. It is installed protrudingly.

The protruding piece 18 is provided at the middle part in the height direction of the front inner wall of the tip cylindrical portion 11b, and the protruding length in the substantially horizontal direction connects the tip opening 13 and the base opening 12 as shown in FIG. It is set so as not to impede smooth air circulation in the bending space A, and to ensure a sufficient cross-sectional area for air circulation in this portion.

The planar projecting shape of the protruding piece 18 is as shown in FIG. The left and right sides of the projecting piece 18 are extended to the left and right inner walls of the portion connecting with the base cylindrical part 11a to form an extension protrusion 20.20, and this extension protrusion 20.20 is provided at the axially intermediate part of the base cylindrical part 11a. .

The protrusions 18, 20, 20 are provided continuously, and their continuous edges protrude into the interior of the opening 13 in a U-shape as shown in FIG. Form as you like.

Also, the edges 19, 21, 21 of the above protruding pieces 18, 20, 20
is inclined downward, which, together with the above-mentioned shape, reduces the resistance to the inflow of air from the opening 13 and ensures smooth intake of air.

In this way, the bottom of the projecting pieces 18, 20, 20, the tip of the base cylinder part 11a directly below this part, and the front cylinder part 1 between these parts.
A semicircular storage chamber B is formed by the front end inner wall of 1b.

Next, to explain its operation, FIG. 1 shows a normal operating state, in which air is taken in from the tip opening 13 which is the suction port of the main body 11, passes through the bending space A, and passes through the base opening 12 to the suction port of the carburetor 1. Inhaled within 3 days.

In this case, since the main body 11 is elbow-shaped, air is smoothly guided into the carburetor 1 and sucked.

In addition, the projecting pieces 18, 20, and 20 protrude into the flow cross section, but since these have a shape that follows the cross-sectional shape as described above and are inclined downward, the air inflow resistance is reduced as much as possible. Smooth inflow of air is ensured.

When the button is pressed during shallow water propulsion or when the operation is stopped, the main body 11 including the carburetor 1 is tilted as shown in FIG. 3, that is, it is in a tilt-up state.

In this case, since the intake port 2 of the carburetor 1 is inclined downward, fuel leaks, and the leaked fuel G is transferred to the main body 110 and the base cylinder part 1.
It is guided by the lower inner wall of 1a and stored in the storage chamber B, and because it has the protrusions 18, 20, 20 on the upper part, it is prevented from flowing out in the direction of the tip opening 13, and is held in the chamber B.

Also, the hull rolls, and the main body 11 including the carburetor 1
Even if it swings, the leaked stored fuel is retained by the left and right projecting pieces 20.degree. 20, and leakage to the outside is prevented.

Furthermore, even if the main body 11 including the carburetor 1 pitches in the longitudinal direction due to pitching of the boat, the fuel only reciprocates between the bar of the carburetor 1 and the storage chamber B in the main body 11 and does not leak to the outside.

Even if such an outboard motor is affected by rolling or pitching in a tilted-up state, leaked fuel is reliably retained.

FIG. 9 shows a wire mesh 6 attached to the tip opening 13 of the main body 11. Protrusions 22 are formed in advance on the inner periphery of the opening 13, and the wire mesh 6 is fitted to remove foreign objects. It is also possible to prevent the air from entering the intake system and to prevent packfires.

As is clear from the above, according to the present invention, an elbow-shaped fuel leak prevention device main body is connected to the intake port of a carburetor, and a U-shaped protrusion is provided in the main body immediately below the intake side opening. Since a fuel storage chamber was formed at the bottom of this, it was placed in the tilt-up condition required for the operation of the outboard motor.
Even if fuel leaks from the carburetor intake port, the leaked fuel is stored in the storage chamber and is prevented from leaking to the outside.

In particular, in this invention, a U-shaped protrusion is provided just below the intake side opening, so that even if the hull including the outboard motor rolls, the fuel is effectively and reliably retained in the storage chamber, and under any operating conditions. Effectively and reliably prevents fuel from leaking to the outside even if it is peeled off.

Therefore, according to the present invention, it is possible to prevent fuel leakage when the outboard motor is tilted up, which is advantageous in terms of fuel economy, is safe, and is also effective in preventing pollution of peripheral equipment and the sea. Highly preferred.

In addition, according to the present invention, a leak-prevention body having an approximately elbow-shaped outer shape and opening diagonally upward on the air suction side is attached to the horizontally opened carburetor intake port, so that the shape of the body itself can be made smaller. can be formed as well as
Since the bending angle of the air flow path can be kept within 90 degrees at most, the air flow resistance hardly increases.

Further, within the main body, a continuous plate-like protrusion that is substantially horizontal and extends in the left-right direction is integrally formed in a so-called U-shape on the front inner wall of the tip cylinder portion on the suction side. Therefore, the influence on the air flow path, that is, the air flow resistance is extremely small.

Therefore, it is possible to ensure smooth air circulation and fully demonstrate the original function of the carburetor.
Since it is sufficient to attach the elbow-shaped main body integrally molded with the above to the carburetor intake port, the above effects can be achieved in an extremely simple and safe structure, and can be easily implemented by simply attaching it to an existing carburetor. I can do it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a cutaway side view of the device attached to a carburetor, Fig. 2 is a plan view of the same, Fig. 3 is a view similar to Fig. 1 in the fuel storage state, and Fig. 4 is a vertical side view of the main body of the device, FIG. 5 is a half-cut sectional view taken in the 5th direction of the arrow in FIG. 4, FIG. 6 is a half-cut sectional view taken in the 6th direction of the arrow in FIG. FIG. 8 is a view taken in the direction of arrow 7 in FIG. 4, and FIG. 9 is a view of the embodiment in a state where it is attached to a wire mesh. In the drawings, 1 is a carburetor, 2 is an intake port, 10 is a fuel leak prevention device, 11 is a main body, 13 is an opening, 18 and 20 are protrusions, and B is a storage chamber.

Claims (1)

[Scope of utility model registration request] A leak-prevention body 10, which has a substantially elbow-shaped outer shape and has an air suction side opened obliquely upward, is attached to the intake port of a carburetor that opens horizontally. Continuous plate-shaped protrusions 18, 19, 20 that are substantially horizontal and extend in the left-right direction are formed integrally with the main body 10 directly below the opening on the front inner wall of the cylindrical portion 11b, and these protrusions 18,
19. A fuel leakage prevention device for an outboard motor, characterized in that a leakage fuel storage chamber B communicating with the inside of the sheath plater is formed below the pod.