JP3429560B2 - Inlet structure of outboard silencer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for arranging an intake port of a silencer attached to an inlet of a carburetor in an outboard motor mounted on a small boat.

[0002]

2. Description of the Related Art In an outboard motor mounted on a small boat, an entire housing is usually formed by a top cowl, an upper case and a lower case, and a crankshaft is arranged in a vertical direction in the top cowl. An engine is installed, a carburetor is arranged on the crankcase side of the engine, and a thermowax that operates to open and close the nozzle of the carburetor by energizing and raising the temperature at the start is arranged on the side of the carburetor. A silencer for introducing air is attached to the carburetor inlet.

In such an outboard motor, conventionally, the intake port of the silencer is projected laterally on the side of the carburetor opposite to the side where the thermowax is arranged to prevent water from entering. It is provided.

[0004]

By the way, in the above-described conventional outboard motor, since air flow hardly occurs in the vicinity where the thermowax is arranged, it is possible that the temperature is affected by the ambient temperature. There was a problem that the temperature of the thermowax increased and the operation of opening and closing the nozzle of the carburetor became unstable.

An object of the present invention is to eliminate the above-mentioned inconveniences of the conventional outboard motors, and more specifically, to stabilize the temperature of the thermowax without adding a special device. It is an object of the present invention to provide an intake port structure for an outboard motor silencer that can stabilize the open / closed state of a carburetor nozzle operated by the above.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, the present invention is an outboard vessel in which a thermowax is arranged on the side of a carburetor and a silencer is attached to the entrance of the carburetor. In the machine, the intake port of the silencer is arranged so as to face the thermowax.

In the above structure, the intake port of the silencer is preferably formed in the upper part of the silencer so as to correspond to the air intake port of the air duct formed in the upper part of the rear surface of the top cowl. It is preferable that the support portion of the thermowax is arranged so that a part thereof is located below the intake port of the silencer.

[0008]

[Operation] With the above-mentioned configuration, the thermowax becomes air-cooled by the air before being sucked in from the intake port of the silencer, so that the temperature of the thermowax is maintained in a stable state. The opening and closing of the carburetor nozzle is stable.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the intake port structure of an outboard motor silencer of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows an outboard motor to which the silencer intake structure of the present invention is applied. In the outboard motor 1, a top cowl 2, an upper case 3 and a lower case 4 are connected. As a result, a housing for the entire outboard motor is formed, an air duct 2a is formed on the upper rear surface of the top cowl 2, and an engine 5 is arranged in the top cowl 2 so that the crankshaft is arranged in the vertical direction. Is mounted, a carburetor 6 is arranged in front of the engine 5 (on the side of the crankcase 5a), and a silencer 7 is attached to the inlet side of the carburetor 6.

2 and 3 show the arrangement of the carburetor 6 and the silencer 7 arranged in front of the engine. The carburetor 6 corresponds to each cylinder of the engine in the vertical direction as shown in FIG. Although not shown in the drawing, each of them is connected to the intake manifold of the engine at its outlet side, and a silencer 7 is attached to its inlet side.

On one side of the carburetor 6, a thermowax 8 which operates to open and close the nozzle of the carburetor 6 by energizing and raising the temperature at the time of starting is fixed to the side of the carburetor 6. It is attached via the support portion 9.

The silencer 7 attached to the front of the carburetor 6 is common to the three carburetors 6 arranged in the vertical direction, and the entire silencer 7 is a front cover member 7a.
And the rear cover member 7b, as shown in FIG. 3, both sides thereof are formed so as to project laterally beyond the width of the carburetor 6 when viewed from above.

The intake port for taking in the air introduced into the carburetor 6 of the silencer 7 corresponds to the position of the thermowax 8 at the portion of the rear cover member 7b which projects laterally beyond the width of the carburetor 6. An intake inlet 7c protruding rearward is integrally formed, and an intake port 7d is opened on the rear surface of the intake inlet 7c so as to face the thermowax 8.

The intake port 7d is used for the top cowl 2
The silencer 7 is opened rearward so as to correspond to the intake port of the air duct 2a formed on the upper rear surface, and the support portion 9 of the thermowax 8 is connected to the intake port 7d. The silencer 7 is arranged so that a part thereof enters below the intake introduction portion 7c in which the intake port 7d of the silencer 7 is opened.

In the present embodiment having the above-mentioned structure,
During operation of the engine, the thermowax 8 is always in an air-cooled state by the air before being sucked into the intake port 7d of the silencer 7, and the temperature does not rise due to the heat of the engine 5 or the like and is stable. Since the temperature has reached this temperature, the operation of the nozzle of the carburetor 6 is performed in a stable state.

Further, since the intake port 7d of the silencer 7 is provided above the silencer 7 so as to correspond to the intake port of the air duct 2a of the top cowl 2, the air entering from the air duct 2a passes through the silencer 7. It smoothly and efficiently flows into the intake port 7d.

Further, since the support portion 9 of the thermowax 8 is arranged so that a part thereof is inserted under the intake air introduction portion 7c of the silencer 7, the arrangement of the parts near the silencer 7 is compact in the longitudinal direction. It becomes possible to make things.

[0019]

According to the intake port structure of the silencer for an outboard motor of the present invention as described above, the temperature of the thermowax can be stabilized without adding a special device, and the thermowax can be operated thereby. The open / closed state of the carburetor nozzle can be stabilized.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of an outboard motor to which a silencer inlet structure of the present invention is applied.

FIG. 2 is a side view showing an embodiment of the intake port structure of the outboard motor silencer of the present invention.

FIG. 3 is a top view of the embodiment shown in FIG.

[Explanation of symbols]

1 outboard motor 2 top cowls 2a air duct 5 engine 6 carburetor 7 silencer 7d silencer inlet 8 Thermo wax 9 Thermo wax support

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) B63H 21/26 F02B 67/00 F02M 35/16 F02M 1/10 F02M 3/09 F02M 19/00

Claims (3)

(57) [Claims] 1. An outboard motor in which a thermowax is arranged laterally of a carburetor and a silencer is attached to an entrance of the carburetor, wherein an intake port of the silencer is arranged to face the thermowax. Intake structure of silencer for outboard motor. 2. The silencer intake port is formed in the upper portion of the silencer so as to correspond to the intake port of the air duct formed in the upper rear surface of the top cowl. Intake structure of silencer for outboard motor. 3. The intake port of the silencer for an outboard motor according to claim 1, wherein the support part of the thermowax is arranged so that a part thereof is located below the intake port of the silencer. Construction.