JPH0791276A - Outside air introducing device of outboard engine - Google Patents

Abstract

PURPOSE:To discharge sea water entering from an outside air intake open[g without being scattered and deposited on an engine, etc., in an outboard engine, so as to prevent corrosion and damage caused by sea water. CONSTITUTION:In an outside air introducing device formed by arranging an engine 10 in a case 5 composed of a top cowl 2 and a bottom cowl 3, and for introducing outside air into an outboard engine 1, an outside air intake opening 7 is provided on the top cowl 2 side, and an outside air introducing duct 20 communicated with the opening 7, and for introducing outside air into the outboard engine 1 is attanched to a cylinder block 11 of the engine 10. And a lower end opening 20a of the outside air introducing duct 20 is extended downward from a matching surface of the top and bottom cowls 2, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor mounted on the outside of a hull, and more specifically, it discharges seawater that has entered through an outside air intake opening without adhering to the surroundings of an engine, and thus corrodes salt. The present invention relates to improvement of an outside air introduction structure that can be prevented.

[0002]

2. Description of the Related Art Conventionally, in an outside air introduction device for an outboard motor, an outside air introduction duct is installed inside a top cowl as a structure for preventing corrosion due to intrusion of sea water, and the above invaded sea water is guided to a bottom cowl for an engine. It is well known that the structure is designed to prevent seawater from adhering and scattering around.

[0003]

However, in such an outside air introducing device, it is necessary to remove the top cowl and place it on the floor when replacing the top cowl, so that the lower end of the outside air introducing duct is connected to the top cowl and the bottom. It cannot be extended below the face of the cowl. Therefore, the invaded seawater cannot be guided sufficiently downward, and the seawater is scattered or adhered. In an extreme case, the seawater is sucked into the engine together with the air. By the way, in the case where the lower end of the outside air introducing duct is extended below the mating surface, there is a problem that the protruding portion of the outside air introducing duct is easily damaged when the cowl is placed on the floor when replacing the top cowl. . There is also a problem that the workability is reduced due to the increase in the weight of the top cowl due to the attachment of the outside air introduction duct.

The present invention has been made in view of the above-mentioned conventional problems, and seawater that has entered through the outside air intake opening can be discharged to the outside without being scattered or attached to the engine or the like inside the outboard motor. It is an object of the present invention to provide an outside air introduction device for an outboard motor that can prevent corrosion damage and the like due to

[0005]

SUMMARY OF THE INVENTION The present invention relates to an outside air introducing device for introducing outside air into an outboard motor having an engine arranged in a case formed of a top cowl and a bottom cowl, and the outside of the top cowl side. An external air intake opening is provided in the external air intake duct, an external air intake duct communicating with the external air intake opening is attached to the engine side, and the lower end of the external air intake duct is extended below the mating surface of the top cowl and the bottom cowl. It has a feature.

[0006]

According to the outside air introduction device for the outboard motor of the present invention,
Since the lower end of the outside air introduction duct that guides the seawater entering from the outside air intake opening to the external drainage port is extended below the mating surface of the top cowl and the bottom cowl, the lower end opening can be brought close to the drainage port, and the seawater It is possible to reliably prevent adhesion and scattering around the engine, and as a result, it is possible to effectively prevent corrosion damage due to seawater inside the outboard motor.

Further, according to the present invention, since the outside air introducing duct is attached to the engine side, even if the lower end of the duct is projected below the mating surface, damage or work of the duct or the like occurs when the top cowl is replaced. The problem of deterioration of sex does not occur.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are views for explaining an outside air introduction device for an outboard motor according to an embodiment of the present invention, and FIG. 1 is a schematic partial cross-sectional side view of an outboard motor including the above outside air introduction device, FIG. 2 is a schematic plan view of the outboard motor with the top cowl removed. In both figures, the left side of the figures is the front side of the hull.

In the drawings, reference numeral 1 denotes an outboard motor, and a case 5 of the outboard motor includes a top cowl 2 and a bottom cowl 3 which are detachably joined at a mating surface 4 and an apron 6 is provided at a lower portion of the case 5. Is attached. The bottom wall 3a of the bottom cowl 3 has an engine exhaust guide 1 which will be described later.
A guide hole through which 5 passes is formed. The exhaust guide 15 and the bottom wall 3a are surrounded by the apron 6, and the lower end of the apron 6 is open.

A panel 9a is formed on the inner surface of the rear portion of the top cowl 2 to form an outside air introducing portion 9 together with the top cowl 2, and the outside air introducing portion 9 is provided with an opening 7 for taking in outside air. In addition, the panel 9a is formed with an outside air inlet 8 for introducing the outside air taken in through the opening 7 into the case 5 in a cylindrical shape upward.

An engine 10 is housed in the case 5. The engine 10 is a vertical V-type crankshaft 6
A cylinder engine, which includes a cylinder block 11 having a V-bank-shaped cylinder bore, a cylinder head 13 mounted on a rear surface of the cylinder block 11,
The cylinder block 11 is provided with a crankcase 14 mounted on the front side mating surface. Reference numeral 12 is a spark plug.

An exhaust guide 15 for guiding the exhaust gas of the engine 10 to the outside is connected to the lower end of the engine 10 in the crankshaft direction, and the guide 15 is arranged in the apron 6. Further, three sets of carburetors 17 are connected to the front surface of the crankcase 14 of the engine 10 via an intake manifold 16. A muffler 18 is connected to the vaporizer 17,
Outside air is sucked in through an opening 18a provided in the upper part of
It is supplied to the vaporizer 17.

A CDI electrical unit 19 for igniting the ignition plug 12 is provided on the rear side of the engine 10 and an outside air introducing duct 20 is provided on the rear side of the electrical unit 19. Is arranged so as to cover. The outside air introduction duct 20 has a rectangular cross section with a size substantially the same as the width of the V bank, and is attached to the cylinder block 1 by mounting bolts 21a and 21b.
It is attached to 1.

An upper end opening 20b of the outside air introducing duct 20
Communicates with the outside air intake port 8 of the panel 9, and a seal member 22 seals between the openings. Further, the outside air introduction duct 20 is a V of the cylinder block 11.
It extends downward between the banks, and its lower end opening 20a is located below the mating surface 4 of the top and bottom cowls 2 and 3 and near the drainage port 3b provided in the bottom cowl 3. There is.

Next, the function and effect of this embodiment will be described. When the engine 10 starts, the outside air taken in through the opening 7 passes through the outside air introducing duct 20 and the duct 20.
Is introduced into the case 5 through the lower end opening 20a, flows in the direction of the white arrow in the drawing through the left and right sides of the engine 10, is sucked into the silencer 18 through the upper opening 18a thereof, and passes through the carburetor 17. It is installed in the crankcase 16. On the other hand, the seawater that has entered the outside air introduction duct 20 together with the outside air flows from the lower end opening 20a of the duct 20 in the direction of the black arrow in the figure, and is discharged to the outside through the drainage port 3b.

As described above, in this embodiment, since the lower end opening 20a of the outside air introducing duct 20 is extended below the mating surface 4, the seawater entering from the outside air intake 8 is transferred to the engine 1
It can be discharged without being scattered around 0, thus preventing corrosion due to salt.

In this embodiment, since the outside air introducing duct 20 is attached to the cylinder block 11 of the engine 10, even when the outside air introducing duct 20 is extended below the mating surface 4, the top cowl 2 is removed. In addition, it is possible to avoid damage to the downward projection of the duct 20. Further, the top cowl 2 does not become heavy due to the outside air introduction duct 20, and the workability can be improved from these points.

In the above embodiment, the outside air introducing duct 20 is used.
The example in which the above is communicated with the outside air intake port 8 of the panel 9 attached to the top cowl 2 has been described.
It is also possible to extend 0 itself upward so that it directly communicates with the opening 7 of the top cowl 2.

[0019]

As described above, according to the outside air introduction device for an outboard motor of the present invention, the lower end of the outside air introduction duct for introducing outside air into the outboard motor is located below the mating surface of the top cowl and the bottom cowl. Since it is extended, the seawater that has entered with the outside air can be reliably discharged to the outside without being scattered and attached around the engine, and there is an effect that corrosion damage to the engine and the like can be prevented. Further, since the outside air introduction duct is attached to the engine side, even if the lower end of the duct is extended below the mating surface, damage to the duct and the like can be avoided and workability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional side view of an outboard motor including an outside air introducing device according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the outboard motor of the embodiment with the top cowl removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outboard motor 2 Top cowl 3 Bottom cowl 4 Mating surface 5 Case 7 Opening (opening of outside air) 10 Engine 20 Outside air introducing duct 20a Lower end of outside air introducing duct

Claims (1)

[Claims] 1. An outside air introduction device for introducing outside air into an outboard motor having an engine arranged in a case formed of a top cowl and a bottom cowl, wherein an outside air intake opening is provided on the top cowl side. An outside air introduction duct communicating with the outside air intake opening is attached to the engine side, and a lower end of the outside air introduction duct is extended below a mating surface of the top cowl and the bottom cowl. Introduction device.