JP4269026B2 - Outboard motor intake system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an outboard motor intake system.
[0002]
[Prior art]
In an outboard motor, the engine is covered with an engine cover called a cowling. Generally, an air intake is provided on the upper surface of the rear part of the cowling in the propulsion direction of the ship, and the air taken in from the air intake is around the engine body. After flowing through, a structure is adopted in which the air is sucked from a silencer disposed in the front part of the engine. The reason why the air intake is provided at the rear part of the engine cover is to prevent water from entering the engine cover as the ship sails, and to prevent noise generated at the air intake.
[0003]
[Problems to be solved by the invention]
However, in the conventional intake structure described above, air flows around the engine body and is then sucked into the silencer, which causes a problem that the intake air temperature rises and intake efficiency decreases, and various electrical components When the engine is installed in the front of the engine, the electrical components are not sufficiently cooled for the same reason. For example, when the electrical components are provided on the side of the engine, the size in the width direction is increased and it is difficult to reduce the size. Have the problem of becoming.
[0004]
The present invention solves the above-described conventional problems, and prevents an increase in engine intake air temperature, improves the cooling performance of electrical components, prevents water from entering, and reduces the size of the engine. It is an object of the present invention to provide an outboard motor intake device that can perform the above-mentioned.
[0005]
[Means for Solving the Problems]
The invention of claim 1, wherein in order to achieve the above object, an intake pipe 30 disposed on the side surface of the engine body 20, a silencer 32 disposed in front of which is connected to the intake pipe the engine body, An outboard motor comprising an engine cover for covering the engine body, wherein the engine cover is formed so as to form a recess 42 that is recessed toward the engine side at a front portion of the engine cover and penetrates a bottom wall of the recess. An air intake cylinder 43 that communicates the inside with the outside air is disposed, the hollow portion is covered with a cover member 16, an air intake port 17 is provided between the cover member and the engine cover side surface, and the air intake The lower end portion 43a of the cylinder for insertion is set lower than the lower end of the air suction port 32a of the silencer, and the invention according to claim 2 is characterized in that the silencer 32 according to claim 1 is provided. The air intake port 32a of the silencer 32 is disposed on one side in the engine cover 14 and is disposed in a direction perpendicular to the horizontal axis of the engine body 20, and the air intake tube The body 43 is arranged on the other side of the engine cover 14, and the invention according to claim 3 is the V-type engine according to claim 1, wherein the silencer 32 is disposed on both sides in the engine cover 14. The air intake port 32a of the silencer 32 is disposed to face the central portion of the engine body 20, and the air intake cylinder 43 is disposed at a substantially central portion of the engine cover 14. According to a fourth aspect of the present invention, in the first to third aspects, a notch 43b is formed in the front portion of the air intake cylinder 43 inside the engine cover 14. Door and features a. In addition, the number added to the said structure contrasts with drawing in order to make an understanding of this invention easy, and this invention is not limited at all by this.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of an outboard motor intake device according to the present invention. In addition, about the same structure between each drawing, the same number may be attached | subjected and description may be abbreviate | omitted.
[0007]
1A is a side view of the outboard motor, and FIG. 1B is a plan view thereof. The outboard motor 1 is pivotally supported by a clamp bracket 3 which is detachably attached to the rear part (relative to the propulsion direction) of the hull 2 and is pivotally supported by the clamp bracket 3 in the vertical direction a via a pivot shaft 4. A swivel bracket 5, a steering bracket 6 that rotates in the horizontal direction around the swivel bracket 5, and a propulsion unit 9 that is supported by the steering bracket 6 via a mount 7. The propulsion unit 9 includes an upper case 10 supported by the steering bracket 6, and a guide exhaust 12 that is a support member for supporting the engine 11 and a lower cowling 13 that covers a lower portion of the engine are attached to the upper case 10. An upper cowling (engine cover) 14 that covers the upper portion of the engine 11 is detachably attached to the lower cowling 13. A lower case 15 is attached to the lower part of the upper case 10 and constitutes a casing as a whole.
[0008]
A cover member 16 is detachably attached to the front portion F of the engine cover 14, and air intakes 17 are opened on the left and right sides of the cover member 16, and the cover member 16 is horizontal to the air intake 17. A foreign matter removing rib 16a extending in the direction is formed. Further, an air intake 19 is formed in the rear portion R of the engine cover 14. Air from the air intake 17 is mainly used as intake air to the engine 11, and air from the air intake 19 is mainly used for cooling the engine 11.
[0009]
2 is a plan view of the engine 11 of FIG. 1, FIG. 3 is a side view seen from the X direction of FIG. 2, FIG. 4 is a side view seen from the Y direction of FIG. 2, and FIG. It is a front view which shows the partial cross section seen from the Z direction.
[0010]
The engine 11 is a water-cooled four-cycle four-cylinder engine, and a crankshaft 21 and camshafts 22 and 23 are disposed in the engine body 20 so as to penetrate in the vertical direction. A driving pulley 24 and a flywheel 25 are fixed to the upper part of the crankshaft 21, and driven pulleys 26 and 27 are fixed to the camshafts 22 and 23, and the driven pulleys 26 and 27 are rotated by a belt 29. Is transmitted to. Four cylinders (not shown) are arranged in the engine body 20 in the vertical direction, and four intake pipes 30 are connected to each cylinder, and are respectively disposed in front of the engine 11 through a throttle body 31. The silencer 32 is joined and connected. An oil separation chamber 33 is provided on the upper surface of the rear portion R of the engine body 20, and the oil separation chamber 33 is connected to the silencer 32 by a blow-by gas pipe 34. Reference numeral 35 denotes a fuel pump, 36 denotes a thermostat, 37 denotes a starter motor, and 38 denotes a flywheel cover. Fuel is sent to the fuel injection valve 28 and injected into the intake pipe 30. The rotation shaft 37 a of the starter motor 37 is meshed with the ring gear 25 a of the flywheel 25. In addition, electrical components such as an ECU box 39, a power supply box 40, and a relay box 41 are mounted on the front portion F of the engine body 20.
[0011]
Next, features of the present embodiment will be described. The intake pipe 30 is disposed on one side of the engine body 20, and the silencer 32 connected to the end of the intake pipe 30 is disposed in front of the engine body 20 and on one side in the engine cover 14. And the air inlet 32a of the silencer 32 has faced the orthogonal | vertical direction with respect to the horizontal direction axis line of the engine body 20, as shown in FIG. As shown in FIG. 3, the air suction port 32a is formed in a substantially rectangular shape so that air is sucked into the four intake pipes 30 in parallel, and a mesh member 32b for preventing backfire is provided in the vicinity of the inlet. ing.
[0012]
As shown in FIGS. 2 and 3, a recess 42 is formed at the front of the engine cover 14 on the opposite side of the silencer 32, and the recess 42 is covered with the cover member 16 of FIG. 1. As described with reference to FIG. 1, the cover member 16 has air intake openings 17 on both the left and right sides, and a foreign substance removing rib 16 a extending horizontally to the air intake opening 17. An air intake cylinder 43 is provided so as to penetrate the bottom wall 42a of the recess 42, and the inside of the engine cover 14 is communicated with the outside air. At this time, the lower end 43a of the air intake cylinder 43 is set lower than the lower end of the air suction port 32a by a predetermined distance to provide a head difference h.
[0013]
The effect | action of this embodiment which consists of the said structure is demonstrated. The air taken in from the air intake port 17 enters the lower portion of the engine cover 14 through the recess 42 and the air intake cylinder 43 as shown by the arrows in the figure, and rises from there to the ECU box 39 and the power supply box. 40. After the relay box 41 is cooled, the air is sucked from the air inlet 32a of the silencer 32. Moisture or water droplets mixed in the air fall downward from the lower end 43a of the air intake cylinder 43 and are discharged to the outside through the bottom wall of the lower cowling 13.
[0014]
Therefore, as compared with the system in which the air intake is provided at the rear portion of the engine cover 14, the engine intake temperature can be prevented from rising, the cooling performance of the electrical components can be improved, and the front side of the engine cover 14 can be improved. By the action of the air intake 17 provided in the air intake 17, the air intake cylinder 43 provided in the hollow 42, and the cover member 16 covering the hollow 42, water intrusion from the front of the engine cover 14 to the engine body 20 is prevented. can do. Furthermore, since the hollow portion 42 is formed in the space on the opposite side of the silencer 32 in the engine cover 14 and the air intake cylinder 43 is provided, the engine can be made compact.
[0015]
6 and 7 show another embodiment of an outboard motor intake device according to the present invention, FIG. 6 is a plan view similar to FIG. 2, and FIG. 7 is a side view seen from the X direction of FIG. It is. In the following embodiments, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.
[0016]
In the present embodiment, a notch 43 b is formed in the front portion of the air intake cylinder 43 inside the engine cover 14. The upper end of the notch 43b is provided with a head difference h ′ by a predetermined distance from the lower end of the air suction port 32a. According to the present embodiment, the air taken into the air intake cylinder 43 flows so as to hit the front wall of the engine cover 14 from the notch 43b as shown by the arrow in the figure, and then the lower part of the engine cover 14 Then, the ECU box 39, the power supply box 40, and the relay box 41 are cooled from there and then sucked from the air inlet 32a of the silencer 32. Accordingly, moisture or water droplets mixed in the air are separated when they hit the front wall of the engine cover 14, and water can be further prevented from entering the engine body 20.
[0017]
8 and 9 show another embodiment of an outboard motor intake device according to the present invention. FIG. 8 is a horizontal sectional view, and FIG. 9 is a partial sectional view as seen from the X direction of FIG. The present embodiment is applied to a V-type (6-cylinder) four-cycle engine, and three intake pipes 30 are arranged on both side surfaces of the engine body 20, and these intake pipes 30 are connected to the engine body 20. It is connected to the left and right sides of the silencer 32 disposed in the front center. An air suction port 32a is formed at the center of the silencer 32 so as to face the engine body 20, and a recess 32c that is recessed toward the engine side is formed on the opposite side of the air suction port 32a. A recess 42 is formed at the front center of the engine cover 14 along the recess 32 c of the silencer 32, and the recess 42 is covered with the cover member 16. An air intake cylinder 43 is provided so as to penetrate the bottom wall 42a of the recess 42, and the lower end 43a of the air intake cylinder 43 is different from the lower end of the air intake port 32a by a head difference by a predetermined distance. h is provided. Since the operation is the same as that of the above embodiment, the description is omitted.
[0018]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible. For example, in the above embodiment, an example in which the present invention is applied to a four-cycle engine has been described, but it is needless to say that the present invention may be applied to a two-cycle engine.
[0019]
【The invention's effect】
As apparent from the above description, according to the invention of claim 1, it is possible to prevent an increase in engine intake air temperature, improve the cooling performance of electrical components, and prevent water intrusion,
According to the invention of claim 2, the engine can be made compact,
According to the invention of claim 3, it can also be adopted for a V-type engine,
According to the invention of claim 4, it is possible to further prevent water from entering the engine body,
According to the fifth aspect of the present invention, since the buffer space is formed by the recess and the cover member, it is possible to further prevent water from entering the engine body and the generation of noise, and further reduce the size of the engine. In addition, noise can be reduced by providing the air intake port not on the front side of the engine cover but on the side surface.
[Brief description of the drawings]
FIG. 1 shows an embodiment of an outboard motor intake device according to the present invention, FIG. 1 (A) is a side view of the outboard motor, and FIG. 1 (B) is a plan view thereof.
FIG. 2 is a plan view of the engine of FIG.
FIG. 3 is a side view seen from the X direction of FIG. 2;
4 is a side view seen from the Y direction in FIG. 2. FIG.
5 is a front view showing a partial cross section seen from the Z direction in FIG. 2; FIG.
FIG. 6 is a plan view similar to FIG. 2, showing another embodiment of an outboard motor intake device according to the present invention.
7 is a side view seen from the X direction of FIG. 6. FIG.
FIG. 8 is a horizontal sectional view showing another embodiment of the outboard motor intake device of the present invention.
9 is a partial cross-sectional view seen from the X direction of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 14 ... Engine cover 16 ... Cover member 17 ... Air intake port 20 ... Engine body 30 ... Intake pipe 32 ... Silencer 32a ... Air intake port 42 ... Depression part 43 ... Air intake cylinder 43a ... Lower end part 43b ... Notch part

Claims (4)

An intake pipe which is disposed on a side surface of the engine body, and a silencer in which the which is connected to the intake pipe disposed in front of said engine body in the outboard motor with an engine cover covering the engine body,
Wherein forming a recessed recess on the engine side to the front of the engine cover, and disposing the air intake needful tubular body communicating the interior of the engine cover to the outside air so as to penetrate the bottom wall of the recess, the The recess is covered with a cover member, an air intake is provided between the cover member and the engine cover side surface, and the lower end of the air intake cylinder is set lower than the lower end of the air intake port of the silencer. An outboard motor air intake device. The silencer is disposed on one side in the engine cover, and the air intake port of the silencer is disposed in a direction perpendicular to the horizontal axis of the engine body, and the air intake cylinder 2. The outboard motor intake system according to claim 1, wherein is disposed on the other side of the engine cover. In the V-type engine, the silencer is disposed on both sides in the engine cover, and the air intake port of the silencer is disposed to face the center of the engine body, and the air intake cylinder is the engine 2. The outboard motor intake system according to claim 1, wherein the intake system is disposed at a substantially central portion of the cover. The outboard motor intake device according to any one of claims 1 to 3, wherein a cutout portion is formed in a front portion of the air intake cylinder inside the engine cover.

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