JP2012171378A - Intake device of outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device of an outboard motor, which achieves superior air intake performance while preventing entry of water.SOLUTION: The intake device of the outboard motor supplies outside air, which is taken in through an outside air inlet 102, to a throttle body to make the outside air sucked in. A space for making the outside air inlet 102 and the throttle body communicate with each other is isolated from an engine room and disposed above a basic engine in the engine room.

Description

  The present invention relates to an intake device that supplies combustion air to an engine mounted on an outboard motor.

  In an outboard motor including an internal combustion engine housed in an engine room formed by an engine cover, various techniques are known for preventing water mixed in combustion air from entering the combustion chamber. In particular, an internal combustion engine mounted on a propulsion device such as an outboard motor is required to have an excellent water intrusion prevention function after being made compact.

  Conventionally, in an outboard motor described in, for example, Patent Documents 1 and 2, from the intake inlet of an intake device, for the purpose of preventing water from entering the combustion chamber of the internal combustion engine and improving the charging efficiency of intake air, etc. When water is mixed in the inflowing combustion air, the water is separated from the combustion air by centrifugal force in the reverse passage.

  Specifically, in an outside air intake structure of an outboard motor in which an outside air intake is provided at the upper rear portion of the engine cover that covers the engine, an air intake duct that is fixedly disposed on the engine side, and the engine cover are mounted. An air intake guide that is connected to the air intake duct and guides the outside air taken in from the outside air intake duct to the air intake duct, and the outside air taken in from the outside air inlet is connected to the air intake guide and the air. It is configured to be guided to the lower part in the engine cover through the intake duct.

JP 2007-8416 A JP 2008-88881 A

However, the air taken into the engine cover flows near the hot engine and is warmed, and then is sucked into the throttle body and sent to the combustion chamber. The intake air at a high temperature has problems such as poor charging efficiency (volumetric efficiency), combustion efficiency, and fuel efficiency.
Further, in this type of outboard motor, the outside air intake port of the outside air intake space formed by the exterior cover normally opens rearward, that is, in the direction opposite to the outboard motor advance direction. In such an exterior cover structure, particularly with respect to intake air, air is taken in against the flow of air flowing outside the outboard motor. In this way of intake intake, intake resistance is generated and intake efficiency is deteriorated, resulting in a decrease in engine output.

  An object of the present invention is to provide an intake device for an outboard motor that achieves excellent intake performance while preventing water intrusion.

  An intake device for an outboard motor according to the present invention is an outboard motor intake device that feeds outside air taken in from an outside air intake port to the throttle body and sucks the outside air, and communicates the outside air intake port and the throttle body. The space is isolated from the engine room, and is disposed above the engine body in the engine room.

  Further, in the outboard motor intake device of the present invention, a separator for gas-liquid separation is provided in the middle of the air flow path in the space, and the separator has a skirt portion extending at least a front portion thereof downward. It is provided with.

  In the outboard motor intake system of the present invention, the lower end of the skirt portion is disposed below the intake communication port of the throttle body.

  In the outboard motor intake device of the present invention, the lower end of the outside air intake port is disposed above the lower end of the skirt portion.

  In the outboard motor intake device according to the present invention, it further includes a plate member for isolating the space from the engine room.

  According to the present invention, the combustion air is supplied to the throttle body and thus to the engine via an air flow path in a space isolated from the engine room. That is, since it is not warmed by the high-temperature engine on the way to the engine, the intake charging efficiency is increased, and the combustion efficiency and the like can be greatly improved. In addition, a separator is placed on the inflow direction extension line of the intake air flowing into the expansion chamber from the outside air intake port, and the skirt portion extends downward, so that moisture contained in the intake air collides with the skirt portion. Thus, gas-liquid separation is accurately performed.

1 is a left side view showing an overall schematic configuration example of an outboard motor according to the present invention. It is a perspective view which shows the example of an external appearance structure of the outboard motor which concerns on this invention. FIG. 3 is an exploded perspective view around the engine cover of the outboard motor according to the present invention. It is a front view around the upper engine cover according to the present invention. It is a back perspective view around the upper engine cover concerning the present invention. It is a perspective view which shows the inner side of the upper engine cover which concerns on this invention. It is sectional drawing which follows the II line | wire of FIG. It is a perspective view which shows the underplate and separator periphery in the engine cover which concerns on this invention. It is a perspective view which shows the underplate circumference which removed the separator in the engine cover which concerns on this invention.

Hereinafter, preferred embodiments of an outboard motor intake device according to the present invention will be described with reference to the drawings.
FIG. 1 is a left side view showing a schematic configuration example of an outboard motor 10 according to the present invention. In this case, the outboard motor 10 is fixed to the rear plate P of the hull on the front side as shown. In the following description, the front of the outboard motor 10 is indicated by an arrow Fr, the rear is indicated by an arrow Rr, and the lateral right side of the outboard motor 10 is indicated by an arrow R as required. Are indicated by arrows L, respectively.

  In the overall configuration of the outboard motor 10, the engine unit 11, the mid unit 12, and the lower unit 13 are sequentially arranged from the upper part to the lower part. In the engine unit 11, the engine 14 is mounted and supported vertically through the engine base so that the crankshaft 15 faces the vertical direction. As the engine 14, for example, a multi-cylinder engine such as a V-type 6-cylinder engine can be adopted. The mid unit 12 is supported via an upper mount 16 and a lower mount 17 so as to be integrally rotatable around a support shaft 19 set on the swivel bracket 18. Clamp brackets 20 are provided on the left and right sides of the swivel bracket 18, and are fixed to the rear plate P of the hull via the clamp brackets 20. The clamp bracket 20 is supported so as to be pivotable in the vertical direction around a tilt shaft 21 set in the horizontal direction.

  In the mid unit 12, a drive shaft 22 connected to the lower end portion of the crankshaft 15 is vertically disposed so that the driving force of the drive shaft 22 is transmitted to a propeller shaft described later in a gear case of the lower unit 13. It is like that. On the front side of the drive shaft 22, a shift rod 23 for performing forward / reverse switching or the like is arranged in parallel in the vertical direction. The mid unit 12 has a drive shaft housing that houses the drive shaft 22. The mid unit 12 is provided with an oil pan for storing oil for lubricating the engine unit 11.

  The lower unit 13 includes a gear case 25 including a plurality of gears that rotate the propeller 24 by the driving force of the drive shaft 22. Each of the drive shafts 22 extending downward from the mid unit 12 causes the gear attached to itself to mesh with the gear in the gear case 25 to eventually rotate the propeller 24. The power transmission path of the gear device in the case 25 is switched, that is, shifted.

  The engine unit 11 is accommodated in an engine room 1 formed by an engine cover 100 that is an exterior. The engine cover 100 includes an engine cover 100A that constitutes an upper cover or a top cover that covers the upper part of the engine cover 100, and an engine cover 100B that constitutes a lower cover or a lower cover, which are integrally joined together as shown in FIG. As a whole, it forms an outline shape such as an egg shape or a lemon shape. The interior of the engine room 1 covered with the engine cover 100 has a sealed structure and is substantially shielded from the outside air.

  Here, in this example, in the engine unit 11 having the V-type 6-cylinder engine 14, the cylinder blocks corresponding to both sides of the V-shape are arranged with respect to the crankshaft 15 arranged corresponding to the V-shaped valley. It arrange | positions so that it may spread back. A throttle body for supplying an air-fuel mixture to each cylinder of the cylinder block is arranged in a manner sandwiched inside the V-shape of the cylinder block. In addition, a throttle body connecting pipe or tube 26 connected to the intake port 27 (see FIG. 7) of the throttle body for supplying intake air opens upward near the lower side of the engine cover 100A. The throttle body connecting pipe 26 is disposed near the rear end of the engine room 1.

  3 to 5 each show the periphery of the engine cover 100A. The engine cover 100A has a generally elliptical or oval shape that is long in the front-rear direction in a plan view, and is gently curved so as to be convex upward as a whole. As a material for forming the engine cover 100A, for example, carbon fiber reinforced plastic (CFRP) is suitable. An intake device that is isolated from the engine room 1 is configured inside the engine cover 100A as described later.

  On the upper surface of the engine cover 100A, there is a bulging portion 101 projecting upward near the front portion. As an overall form of the bulging portion 101, the front end edge thereof is formed in a straight line in a substantially vertical direction in a side view, and a wall to be described later, which rises substantially perpendicular to the upper surface of the engine cover 100A. 101a. Similarly, in a side view, while maintaining a moderately upwardly curved shape from the front end of the surrounding wall 101a toward the rear, the upper surface of the engine cover 100A is gently inclined downward and downward so as to exhibit a streamline. It has the back part 101b which continues. In addition, the bulging portion 101 is gradually narrower while maintaining a curved shape that is moderately convex in the left-right direction from the front end edge formed in a substantially linear shape in the left-right direction (width direction) to the rear, as viewed from above. It converges to become.

  In the front part of the bulging part 101, an outside air intake 102 that opens forward is opened. Here, the forward direction includes not only a direction orthogonal to the left and right direction and a horizontal front direction but also a direction that is appropriately inclined in the vertical and horizontal directions with respect to this case. The outside air inlet 102 is, for example, circular, and is provided in the back of the enclosure wall 101a that is recessed backward from the front end. In addition, a strainer or filter 103 having an appropriate mesh is attached to the outside air inlet 102 so as to prevent entry of foreign matters from the outside. A surrounding wall 101a extending forward is formed by a part of the bulging portion 101 around the outside air inlet 102, and the outside air inlet 102 is arranged in a form surrounded by the surrounding wall 101a. .

The lower part of the surrounding wall 101a extends further forward while curving in a moderately concave shape in a side view, thereby forming a connecting part 101c with the upper surface of the engine cover 100A. The pair of left and right connecting portions 101c extend in a slightly narrower direction toward the front while maintaining a curved shape that is convex in the right and left direction when viewed from above. In addition to the case where the width becomes narrow as described above, it may be substantially expanded substantially parallel to each other or slightly forward.
Further, the left and right outer sides extending downward from the back portion 101b are configured as a protruding portion 101d that protrudes outward so as to surround the back portion 101b from the periphery. The protruding portion 101d is formed so as to be smoothly continuous with the connecting portion 101c formed on the front side.

  As described above, the engine cover 100A and the bulging portion 101 on the upper surface thereof are generally formed in an outwardly convex curved surface or curved line having an appropriate radius (R), and have a rounded shape as a whole. That is, it has an outer shape that does not substantially have an acute angle portion and suppresses air resistance as much as possible. Further, the inside of the bulging portion 101 has a hollow structure that substantially corresponds to such an outer shape, and the inside and outside of the bulging portion 101 communicate with each other via the outside air intake 102.

Further, in the above case, as shown in FIG. 7 and the like, a stepped portion 104 is formed in which the upper surface of the engine cover 100A is recessed on the front side of the lower edge of the outside air inlet 102. The upper surface of the engine cover 100A in front of the stepped portion 104 is a gently inclined surface that is forwardly lowered.
In addition, the enclosure wall 101a extends forward of the outside air inlet 102 as described above, but the inner side (inner wall surface) of the cross-sectional shape is linear, that is, a straight shape such as a cylindrical circumferential surface parallel to the cylinder axis. Have. Further, the outer side (outer wall surface) has a curved shape that is moderately convex outward, and as a whole, for example, has a shape that approximates the wing cross-sectional shape of an airplane.

  Next, the internal configuration of the engine cover 100A will be described. First, as shown in FIG. 6, an inner space 105 </ b> A is formed inside the engine cover 100 </ b> A by the bulging portion 101 projecting outward as described above. Further, the engine cover 100A closes with the under plate 106 shown in FIG. 7 along the outer peripheral edge thereof, and an expansion chamber 105 is formed between the two including the inner space 105A inside the bulging portion 101. . The expansion chamber 105 has a function of converting the dynamic pressure of air taken from the outside air inlet 102 into a static pressure. Here, the engine cover 100 main body itself has an open structure in which the upper end is opened. As shown in FIG. 8, the under plate 106 is attached to the upper end of the main body of the engine cover 100, and by providing the under plate 106, the expansion chamber 105 side, the engine room 1 side formed in the engine cover 100, Is substantially isolated. That is, the engine room 1 is substantially formed by the engine cover 100 main body.

  The under plate 106 is formed in a generally elliptical shape that is long in the front-rear direction in a plan view, like the engine cover 100A, and has a generally dish-shaped or flat-bottomed thin pan shape as a whole. The dish-shaped depth is generally formed so as to gradually become deeper toward the rear, and has a bottomed structure having a bottom portion 106b that is stepped through the step portion 106a and becomes substantially horizontal. Further, as described above, the throttle body connection pipe 26 is disposed near the rear end of the engine room, but the separator 107 is fixedly supported so as to be disposed above the throttle body connection pipe 26. The separator 107 has a function of preventing moisture from entering the throttle body connecting pipe 26 that opens upward, and a skirt portion 107a that is bent downward along its front edge is suspended. The skirt portion 107a is curved, for example, in an arc shape so as to protrude forward in plan view, and the separator 107 on the rear side of the skirt portion 107a is in close contact with the inner peripheral surface of the under plate 106.

  FIG. 9 shows a state where the separator 107 is removed from the under plate 106. The bottom portion 106b of the under plate 106 has a guide base portion 108 for airflow guide that protrudes from the bottom portion 106b so as to surround the periphery of the upper end opening portion 26a of the throttle body connecting pipe 26. The guide base portion 108 is formed, for example, in a truncated cone shape, and an opening 108 a disposed so as to be aligned with the upper end opening portion 26 a of the throttle body connecting pipe 26 is opened in the upper portion. The peripheral surface of the guide base portion 108 is formed as an inclined surface 108b that is inclined toward the opening 108a.

  A plurality of connecting rods 109 for supporting the separator 107 are erected on the periphery of the opening 108 a of the guide base 108. The separator 107 supported by the connecting rod 109 is disposed substantially parallel to the bottom 106b of the under plate 106 above the opening 108a of the guide base 108 as shown in FIG. In this case, the lower end of the skirt portion 107a of the separator 107 is positioned below the opening 108a of the guide base portion 108 as shown in FIG. Further, as shown in FIG. 7, the lower edge of the outside air inlet 102 is disposed above the lower end of the skirt portion 107a of the separator 107.

  Furthermore, a drainage passage that communicates the inside space of the engine cover 100A that is isolated from the engine room 1 side via the under plate 106, that is, the inside of the expansion chamber 105 and the outside thereof is provided. Specifically, as shown in FIG. 7, a drain pipe or tube 111 routed from the bottom 106 b of the under plate 106 to the opening 110 (see FIG. 2) provided in the engine cover 100 </ b> B that is a lower cover. It drains through this drain pipe 111. In this case, a drain hole 112 to which the upper end of the drain pipe 111 is connected is provided in the bottom portion 106 b of the under plate 106. The drain hole 112 is disposed at a position where the bottom portion 106b is substantially always at the lowest position, that is, a position where drainage from the drain hole 112 is possible including when the outboard motor 10 is tilted. More specifically, an appropriate position of the bottom portion 106b located in the immediate vicinity of the step portion 106a of the under plate 106 is preferable.

  In the middle of the drainage passage constituted by the drainage pipe 111, a backflow prevention mechanism for preventing the backflow of drainage is attached. As a backflow prevention mechanism, as shown in FIG. 7, a one-way valve 113 that allows the drainage to flow only in the drainage direction is provided. Further, instead of the one-way valve 113, a bent portion 113A formed by bending the drain pipe 111 into, for example, an S shape as shown in the figure, or both of them can be used in combination.

  Here, the basic operation in the outboard motor 10 configured as described above will be outlined. When the engine 14 of the engine unit 11 is started, the drive shaft 22 connected to the lower end portion of the crankshaft 15 starts to rotate. By appropriately operating the shift mechanism, the driving force of the drive shaft 22 is transmitted to the propeller shaft of the lower unit 13, whereby the propeller 24 rotates and the outboard motor 10 can travel forward.

  In particular, in the flow of combustion intake air supplied to the engine 14, when a ship equipped with the outboard motor 10 travels, first, outside air flows from the outside air inlet 102 provided in the bulging portion 101 of the engine cover 100A. . The air taken in from the outside air inlet 102 enters the expansion chamber 105 through the inner space 105A inside the bulging portion 101, and enters the lower side of the skirt portion 107a of the separator 107 as shown by a dotted arrow A in FIG. Then, the fuel is supplied from the opening 108a of the guide base 108 to the throttle body through the upper end opening 26a of the throttle body connecting pipe 26.

  In addition, as shown by a solid line arrow W in FIG. 7, the water and the like contained in the spray and intake air are separated into gas and liquid by colliding with the separator 107 and fall to the bottom 106 b of the under plate 106. Thereafter, the water is discharged from the opening 110 of the engine cover 100 </ b> B to the outside of the outboard motor 10 through the drain hole 111. That is, even if moisture or the like is taken in from the outside air inlet 102, it is not sucked into the throttle body side.

Next, a description will be given in relation to the main configuration according to the present invention. First, the outside air intake port 102 is provided on the engine cover 100A that covers the upper portion of the outboard motor 10, and the outside air intake port 102 opens forward.
As the boat travels as described above, outside air flows from the outside air inlet 102 provided in the bulging portion 101 of the engine cover 100A above the outboard motor 10. First, since the outside air inlet 102 is opened forward, the running wind can be directly introduced, and the intake efficiency is greatly improved. As described above, conventionally, air has been taken in from the outside air intake opening that opens rearward, and thus the intake efficiency has to be deteriorated. According to the present invention, it is possible to eliminate the difficulty of suction due to physical reasons such as intake resistance, and to increase the intake efficiency and thus the engine output.

  Further, the outside air intake 102 is provided in a bulging portion 101 protruding from the upper surface of the engine cover 100A. By causing the bulging portion 101 to protrude from the upper surface of the engine cover 100 </ b> A, an air flow that strikes the bulging portion 101 is temporarily received, and an air stagnation state is formed at the outside air inlet 102. Basically, it is not such a stagnant state outside or near the outer periphery of the outside air inlet 102, and the air flow rate becomes relatively high. For this reason, the splash or the like is warped from the outside air inlet 102 in the form of being pulled by the outside air flow having a high flow velocity, and in this respect, an invasion preventing effect such as a splash can be obtained. In this way, while the outside air intake 102 is opened forward, it is easy to inhale air, but splashes other than intake air are prevented from entering the outside air inlet 102, and high intake performance can be realized.

  Further, by providing the outside air intake 102 on the upper surface of the engine cover 100 </ b> A covering the upper part of the outboard motor 10, the outboard motor 10 is arranged at the highest position. In front of the outside air inlet 102 arranged in this way, obstacles and the like with respect to the inflowing air are reduced as much as possible, and a smooth inflowing air flow is obtained with respect to the outside air inlet 102. Further, by placing the motor at a high place in the outboard motor 10, it is disposed at a higher position from the water surface, and invasion such as wave splash can be effectively prevented.

  The outside air intake 102, that is, the bulging portion 101, can be provided on the side surface instead of the upper portion of the outboard motor 10. In this case, since the bulging portion 101 projects to the side of the outboard motor 10, the lateral width of the outboard motor 10 becomes large as it is. For example, in particular, even when the outboard motor 10 is mounted on the hull with a plurality of hooks, according to the present invention, the lateral width of the outboard motor 10 itself can be reduced, so that the multiple hooks can be effectively realized.

  Further, a step 104 is provided between the upper surface of the engine cover 100 </ b> A and the lower edge of the outside air intake 102. Further, in this case, the upper surface of the engine cover 100A in front of the stepped portion 104 is an inclined surface that is lowered forward.

By providing the step 104, a dam is formed with respect to the air flow from the front of the outside air inlet 102, and it is possible to effectively prevent direct splashing of waves and the like, and has a breakwater action. Yes. Further, since the upper surface of the engine cover 100A in front of the outside air intake 102 is inclined forward and downward, it is difficult for the splashing W ₁ or the like to climb toward the outside air intake 102 as shown in FIG. 7, and the upper surface of the engine cover 100A. Can be suppressed.

In addition, a surrounding wall 101 a extending forward is provided around the outside air inlet 102. The outside air inlet 102 is arranged in a form surrounded by the surrounding wall 101a, that is, at a deep position in the form of a duct.
By providing the surrounding wall 101a in this way, it is possible to take in outside air from a deep position, thereby preventing direct splashing and the like.

In the specific shape of the surrounding wall 101a, the inner wall surface is typically formed in a substantially linear shape, and the outer wall surface is formed in a curved shape protruding outward.
By making the enclosing wall 101a have such a cross-sectional shape, the outside air has a relatively fast outside flow velocity and the inside becomes slow. For this reason, the wave splash or the like flows so as to bend from the outside air intake 102 on the outer flow having a high flow velocity. Therefore, it is possible to make it difficult for the splash to enter the outside air inlet 102. Further, the connecting portion 101c and the overhanging portion 101d are also convex outward, which contributes to increasing the flow rate of the outside air as in the case of the surrounding wall 101a.

Further, the connecting portion 101c between the surrounding wall 101a and the upper surface of the engine cover 100A is extended forward.
By providing the connecting portion 101c, the lower part of the overall shape of the surrounding wall 101a including the connecting portion 101c extends forward from the upper portion. That is, by enlarging or expanding a part of the surrounding wall 101a, it is possible to further improve the shielding action against splashing and the like.

  Now, the characteristic operation and effect of the outboard motor intake system of the present invention will be further described. The intake device of the present invention feeds outside air taken in from the outside air intake 102 to the throttle body in the space inside the engine cover 100A, that is, the expansion chamber 105, and sucks it. In such an intake device, first, the expansion chamber 105, which is a space communicating the outside air intake 102 and the throttle body, is isolated from the engine room 1 by the under plate 106. Therefore, the intake device is disposed above the engine 14 in a state of being isolated from the engine 14 in the engine room 1.

  As described above, the air taken in from the outside air inlet 102 enters the expansion chamber 105, enters the lower side of the skirt portion 107a of the separator 107 as indicated by a dotted arrow A in FIG. From the opening 108a, the throttle body connecting pipe 26 is supplied to the throttle body through the upper end opening 26a. In this way, the combustion air is supplied to the throttle body, and hence the engine 14, through the air flow path in the space isolated from the engine room 1. That is, in the middle of reaching the engine 14, it is not heated by being exposed to a high-temperature engine, so the intake charging efficiency is increased, and the combustion efficiency and the like can be greatly improved.

  Further, a separator 107 for gas-liquid separation is provided in the middle of the air flow path in the intake device, and a skirt portion 107a is provided that extends at least the front portion of the separator 107 downward.

The intake air that has flowed into the expansion chamber 105 from the outside air inlet 102 in the state shown in FIG. 7 flows toward the rear separator 107. Since the skirt portion 107a extends downward, moisture and the like contained in the intake air are accurately separated from each other by colliding with the skirt portion 107a.
In this case, as shown in FIG. 7, the lower end 102A of the outside air inlet 102 is positioned above the lower end 107A of the skirt portion 107a. The intake air that travels straight from the outside air intake 102 toward the separator 107 always collides with the skirt portion 107a, that is, the intake air does not directly flow into the opening 108a of the guide base portion 108, that is, the throttle body.

  In particular, in this type of outboard motor 10, the trim angle is adjusted while the ship is running, that is, the trim angle is increased, so that the outboard motor 10 as a whole takes a forward leaning posture. During such trim angle adjustment, the inflow angle of the outside air with respect to the outside air inlet 102 also changes, and the directivity of the guide base portion 108 with respect to the opening 108a becomes larger. In this case, if the skirt portion 107a is not provided, the intake air flowing in from the outside air intake port 102 may flow directly toward the opening 108a. In the present invention, even when the outboard motor 10 adjusts the trim angle in this way, since the skirt portion 107a is located between the outside air intake 102 and the opening 108a of the guide base portion 108, the skirt portion 107a directly takes in the intake air. It is possible to prevent the opening 108a from flowing into the throttle body.

  Further, the lower end 107A of the skirt portion 107a of the separator 107 is positioned below the opening 108a of the guide base portion 108 as is apparent from FIG. With such an arrangement configuration of the skirt portion 107a, in combination with the arrangement relationship with the lower end 102A of the outside air inlet 102 described above, a so-called labyrinth effect is exerted on the air flowing in as indicated by the dotted arrow A in FIG. Play. By distributing along the labyrinth path, the gas-liquid separation effect can be further enhanced.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
Although the example which provided the single bulging part 101 and the external air intake 102 in the said embodiment was demonstrated, it is also possible to provide two or more external air intakes 102 similarly comprised.

1 Engine room, 10 Outboard motor, 11 Engine unit, 12 Mid unit, 13 Lower unit, 14 Engine, 15 Crankshaft, 16 Upper mount, 17 Lower mount, 18 Swivel bracket, 19 Support shaft, 20 Clamp bracket, 21 Tilt Shaft, 22 Drive shaft, 23 Shift rod, 24 Propeller, 25 Gear case, 26 Throttle body connecting pipe, 27 Air inlet, 100, 100A, 100B Engine cover, 101 Swelling part, 101a Enclosure wall, 101b Back part, 101c Connecting part 101d Overhang part, 102 Outside air intake, 103 Strainer, 104 step part, 105 Expansion chamber, 105A Inner space, 106 Under plate, 106a Step part, 106b Bottom part, 107 Separator, 107 Skirt 108 guide base portion, 108a opening 109 connecting rod 110 opening, 111 drain pipe, 112 drain hole, 113 one-way valve.

Claims (5)

An outboard motor intake device that supplies outside air taken from an outside air intake to the throttle body for intake.
An outboard motor intake system characterized in that a space communicating the outside air intake and the throttle body is isolated from an engine room and disposed above an engine body in the engine room.   The separator for gas-liquid separation is provided in the middle of the air circulation path in the space, and the separator includes a skirt portion that extends at least a front portion thereof downward. Outboard motor intake system.   The outboard motor intake system according to claim 2, wherein a lower end of the skirt portion is disposed below an intake communication port of the throttle body.   4. The outboard motor intake device according to claim 2, wherein a lower end of the outside air intake port is disposed above a lower end of the skirt portion. 5.   The outboard motor intake system according to any one of claims 1 to 4, further comprising a plate member for isolating the space from the engine room.

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