JP2532581Y2 - Inlet passage closing device for marine engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine engine intake passage closing device for closing an intake passage of an engine mounted inside a hull in order to prevent water from entering the intake passage.

[0002]

2. Description of the Related Art When water is sucked into an engine, inconveniences such as oil turbidity and misfiring due to landing of a spark plug terminal occur. In view of this, there has been proposed a device in which the float valve is actuated by bilge water that has entered the intake passage of the engine to close the intake passage and prevent the occurrence of the inconvenience (see Japanese Utility Model Laid-Open No. 57-63799). ).

[0003]

In the above-described conventional intake passage closing device for an engine, the float valve operates only when bilge water enters the intake passage of the engine, so that the timing of closing the intake passage is delayed. There is a problem that occurs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake passage closing device for a marine engine capable of closing the intake passage before water enters the intake passage. I do.

[0005]

In order to achieve the above object, the present invention provides a marine engine which closes the intake passage to prevent water from entering an intake passage connected to an engine mounted inside the hull. An intake passage closing device, wherein a valve means capable of closing the intake passage is operatively connected to a float provided outside the intake passage, and the valve means is used when the float rises due to bilge water entering the inside of the hull. The first feature is to close the intake passage.

[0006] The present invention provides, in addition to the first feature described above,
The second feature is that the intake passage includes a chamber that opens inside the hull, and valve means provided inside the chamber is operated by a float provided outside the chamber.

According to the present invention, in addition to the first or second feature, the float is provided between a pair of right and left reinforcing portions extending in the front-rear direction inside the hull and projecting upward. The feature of.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show one embodiment of the present invention. FIG. 1 is an overall side view of a small boat, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 3 is a sectional view taken along line -3.

As shown in FIGS. 1 and 2, the hull of a water jet propulsion small boat B has an upper hull 1 and a lower hull 2 made of glass fiber which are vertically joined at their peripheral edges. The rear portion of the upper hull 1 sheet 3 is provided, served with both hands together occupant Zajo on this sheet 3 is placed on the step 1 ₁ recessed both feet on the upper hull 1 to the steering wheel 4, the throttle lever 5 Is operated while operating the small boat B.

[0011] hull around the pair formed in the direction reinforcement portion 2 ₁ the inner surface of Roaharu 2, the two-cycle 2-cylinder engine E is mounted via a vibration damping mount 6 made rubber.
The rear portion of Roaharu 2 partitioned by the bulkhead 7, the rear end with provided at the front end of the water intake ₈₁ that opens to the bottom of Roaharu 2, the steering nozzle 9 to swing to the left and right are connected to the steering wheel 4 Is provided. The rotating shaft 11 of the impeller 10 housed inside the duct 8 penetrates the upper surface of the duct 8 and the bulkhead 7 forward, and the coupling 12
3, the intermediate shaft 13 is further connected to a coupling 14
Through the crankshaft 15 of the engine E. Therefore, the rotation of the crankshaft 15 of the engine E is transmitted through the intermediate shaft 13 and the rotation shaft 11 to the impeller 1.
0 and the rotation of the impeller 10 causes the water intake 8 ₁
The water sucked into the duct 8 blows out from the steering nozzle 9 rearward, and propels the small boat B. Then, by operating the steering handle 4 to change the direction of the steering nozzle 9, the direction of the water jet is controlled to perform left and right steering.

[0012] engine room formed in Roaharu 2 front of the front of the bulkhead 7, the air intake passage which is沿設from the air inlet 16 ₁ provided on the inner surface of the upper hull 1 forward of the steering wheel 4 External air is introduced via 16. The ventilation room 1 is inside the engine room.
7, and communicates with the space on the lower surface of the seat 3;
It communicates with the outside air through the ventilation port 18 at the rear end.

Referring to FIG. 3 together, it is apparent that
The reinforcing portion 2 ₁ of the left Roaharu 2, the intake box 19 to be located on the left front of the engine E is mounted by gluing or suitable mounting bracket or the like. The intake box 19 is a hollow box body blow-molded with synthetic resin, and its upper opening is covered with a detachable lid member 20 for maintenance. The bottom surface of the cover member 20 together with the partition plate 20 ₁ is projected downward, from the bottom surface of the intake box 19 partition plate 19 ₁ it is to project upward, suction by the two partition plates 20 _1, 19 ₁ The inside of the box 19 is partitioned into a maze.

An intake cylinder 21 that communicates the interior of the intake box 19 with the engine room penetrates through a lid member 20 of the intake box 19, and a mesh 22 is stretched over the intake cylinder 21 to prevent dust from entering. 2 air inlets 2
1 ₁ is formed. The air inlet 21 ₁ is connected to the intake cylinder 21.
The outside air is introduced into the intake cylinder 21 through a gap between the upper surface of the lid member 20 and the lower surface of the outer periphery of the cover 23. Thereby, the air inlet 21
_In combination with the fact that ₁ is provided at a relatively high position inside the engine room, it is possible to effectively prevent water droplets from entering the inside of the intake cylinder 21.

Meanwhile, wherein the partition plate 20 _1, 19 ₁ interposed therebetween air outlet port 19 ₂ formed on the opposite side of the intake tube 21, an intake pipe 25 connected to an intake manifold 24 of the engine E is connected, The intake pipe 25 is provided with a carburetor 28 having a perforated intake silence box 26 and a throttle valve 27 inside. The intake box 19 and the intake pipe 25
Constitutes an intake passage 29 for the engine E.

[0016] the bottom of the intake box 19 located between the pair of reinforcing portions 2 ₁ Roaharu 2 includes a cylindrical float guide 30 having an opening 30 ₁ in the side surface and the bottom surface is fixed. A guide rod 32 extending upward from the upper surface of the float 31 housed vertically inside the float guide 30 is formed by twisting a strip-shaped metal plate, and is formed in a slit shape formed on the upper surface of the float guide 30. Guide groove 30
₂ penetrates with slight frictional force. The float 31 when the float 31 moves up and down inside the float guide 30 thus has to be rotated according to the torsion of the guide rod 32, is necessary and overcome the frictional force between the guide rod 32 and the guide groove 30 ₂ Therefore, even if the bilge water accumulated at the bottom of the ship is shaken, the float 31 is prevented from dancing up and down. Also, left and right reinforcements 2 ₁ where bilge water is trapped
Providing the float guide 30 between them makes it possible to reliably detect bilge water without being affected by water splashing or swaying of the hull.

The dish-shaped on-off valve 33 is fixed to the upper end of the guide rod 32 extending into the intake box 19, seated on the valve seat 21 ₂ formed on the lower end of the inlet pipe 21 by the opening and closing valve 33 is increased Thus, the communication between the intake box 19 and the engine room is cut off. At this time, the opening-closing valve 33 while moving upwardly so as to seat on the valve seat 21 _2, since the air flows downwards to be introduced into the intake box 19 from the inlet pipe 21, the opening and closing valve 33 is the valve by the intake negative pressure Seat 21 ₂
There is no danger of being adsorbed on.

Next, the operation of the embodiment of the present invention will be described.

[0019] During running of the small boat B, the outside air introduced into the engine room from the air inlet 16 ₁ of the upper hull 1 via the air intake passage 16, the lid member of the intake box 19 2
The gaps and the mesh 22 of 0 the top and the cover 23 from the air inlet port 21 ₁ which is stretched led into the intake tube 21,
It is supplied into the intake box 19 from there through the gap of the opening and closing valve 33 and the valve seat 21 _2. After passes between the intake box 19 the air inside the partition plate 20 ₁ of the two, 19 ₁ flows from the air outlet port 19 ₂ to the intake pipe 25, it passes through the intake silencer box 26 in order to prevent intake noise, The fuel is mixed with the fuel in the carburetor 28 and further supplied to the engine E through the throttle valve 27 and the intake manifold 24. At this time, since the intake box 19 is provided at a position upstream of the throttle valve 27, the influence of the intake box 19 on the flow of the air-fuel mixture can be reduced.

[0020] Now, the bilge water having entered the inside of the reinforcing portion 2 ₁ of the right and left Roaharu 2 flows from the opening 30 ₁ in the interior of the float guide 30, the float 31 accommodated in the interior of the float guide 30 is lifted upward , An on-off valve 33 connected to the float 31 via a guide rod 32
There seated on the valve seat 21 ₂ in the intake pipe 21 the lower end. Then, the inside of the intake box 19 is shut off from the engine room, air is no longer supplied to the intake pipe 25, and the engine E stops. As a result, water is prevented from being sucked into the engine E, and problems such as misfiring of the spark plug are avoided. In addition, the engine E can be stopped by closing the intake passage 29 before the bilge water accumulates at the bottom of the ship, that is, before the bilge water enters the intake passage 29 including the intake box 19 and the intake pipe 25. It is possible to reliably prevent the bilge water from being sucked into E.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and may be variously modified without departing from the present invention described in the claims for utility model registration. It is possible to make design changes.

For example, in the embodiment, the float 31 and the on-off valve 33 are directly connected by the guide rod 32.
It is also possible to connect 1 to the on-off valve 33 via a link mechanism or the like. The engine to be mounted may be a four-cycle engine, in which case clouding of the lubricating oil can be prevented.

[0023]

As described above, according to the first feature of the present invention, a float for detecting intrusion of bilge water is provided outside the intake passage, and the intake passage is closed by valve means interlocked with the float. Therefore, the engine can be reliably stopped before the bilge water enters the inside of the intake passage.

According to the second feature of the present invention, since the valve means is provided inside the chamber formed in the intake passage, the chamber having the valve means can be assembled in advance in a small manner, and the assembling can be easily performed. Will be

According to the third feature of the present invention, since a float is provided between a pair of left and right reinforcing portions extending in the front-rear direction inside the hull and protruding upward, water splash generated by swaying of the hull can be prevented. The effect of the bilge water level change can be reduced, and the float can be reliably operated.

[Brief description of the drawings]

FIG. 1 is an overall side view of a small boat.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

[Explanation of symbols]

1 ..... Upper hull (hull) 2 ----- Roaharu (hull) 2 ₁ ... reinforcing portion 19 ... intake box (chamber) 29 ... air intake passages 31・ Float 33 ・ ・ ・ ・ On-off valve (valve means)

Claims (3)

(57) [Scope of request for utility model registration] 1. An intake passage for a marine engine which closes the intake passage (29) to prevent water from entering into an intake passage (29) connected to an engine (E) mounted inside the hulls (1, 2). A closing device, wherein a valve means (33) capable of closing the intake passage (29) and a float (31) provided outside the intake passage (29) are operatively connected to each other, and the inside of the hull (1, 2) is connected. When the float (31) floats due to the bilge water infiltrating the valve means (3).
(3) closing the intake passage (29).
An intake passage closing device for marine engines. 2. The hull (1, 2), wherein the intake passage (29) is provided.
2. The method as claimed in claim 1, further comprising a chamber (19) open to the inside, wherein the valve means (33) provided inside the chamber (19) is operated by a float (31) provided outside the chamber (19). An apparatus for closing an intake passage of a marine engine as described in the above. 3. The hull (1, 1)
2) The intake passage closing device for a marine engine according to claim 1 or 2, wherein the reinforcement is provided between a pair of left and right reinforcing portions (2 ₁ ) extending in the front-rear direction and projecting upward.