JP3904660B2 - Saddle-type small vessel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small vessel in which an occupant rides on a saddle-type seat portion, and more particularly to a saddle-ride type small vessel in which a power unit is compactly accommodated in a limited space in the hull.
[0002]
[Prior art]
A saddle-ride type small boat is a boat that realizes a motorcycle-like steering feeling by allowing a crew member to ride on the hull, and is used as a leisure boat, a rescue boat, etc. due to its sporty steering feeling and mobility .
FIG. 4 shows a jet propulsion boat with a part of its hull broken away as an example of such a saddle-type small vessel.
[0003]
As shown in the figure, the hull 1 is provided with a steering handle 2 at a substantially central portion thereof, and a saddle-shaped seat portion 3 is provided at the rear of the steering handle 2. That is, the occupant sits on the seat portion 3 (note that the occupant is in a state where his / her foot is placed on the step portion as shown in FIG. 2), and the steering wheel 2 is operated to operate the jet propulsion boat. Steer.
The hull 1 has a structure in which a lower hull panel 4 and an upper hull panel 5 formed of reinforced plastic (FRP) or the like are joined from above and below, and has a buoyancy body structure in which a space 6 is formed. Since the lower hull panel 4 has a mountain shape inclined toward the center line of the ship bottom, the space 6 has a substantially inverted conical shape when viewed in cross section of the hull 1.
[0004]
A power unit is housed in the space 6 in the hull 1, and the engine 8 is seated due to the position of the center of gravity of the hull for obtaining a good steering feeling and the arrangement relationship with the jet propulsion device 7 provided at the rear end of the hull. It is arranged in a space 6 formed in the lower part of the part 3.
The jet propulsion unit 7 forms a flow path from a water intake 9 that opens to the bottom of the ship to a jet nozzle 10 that opens to the rear end of the hull, and an impeller 11 is rotatably accommodated in the flow path. In this structure, the drive shaft 12 is connected to the output shaft 13 of the engine 8. Therefore, when the impeller 11 is rotationally driven by the engine 8, the water taken in from the water intake 9 is ejected from the jet nozzle 10 vigorously, thereby propelling the hull 1 forward.
[0005]
In the figure, 14 is a seal member for rotatably supporting the drive shaft 12 with watertightness, 15 is a fuel tank for containing fuel, 16 is a fuel lid for replenishing the fuel tank 15, In addition, since the engine 8 is a two-cycle engine using a separate oil supply system, an oil tank 17 stores engine oil.
Here, as described above, in the jet propulsion boat, the engine 8 is disposed in the watertight space 6 so that the water outside the ship does not enter the engine. Various proposals have heretofore been made in order to prevent water from entering through an exhaust system or an intake system.
[0006]
In the jet propulsion boat described in Japanese Patent Laid-Open No. 62-35013, the other end of the first exhaust pipe connected to the exhaust outlet of the engine is connected to the exhaust expansion chamber, and the exhaust that discharges the exhaust to the outside of the ship. In the exhaust system structure in which the discharge port and the exhaust expansion chamber are connected by the second exhaust pipe, the other end of the first exhaust pipe protrudes to the center of the exhaust expansion chamber and is connected to the other end of the first exhaust pipe. Is extended substantially perpendicular to the longitudinal direction of the hull. That is, in this jet propulsion boat, even if water enters the exhaust expansion chamber from the exhaust discharge port due to sudden acceleration or waves, this water does not enter the engine from the first exhaust pipe.
[0007]
Further, in the jet propulsion boat described in Japanese Utility Model Laid-Open No. 5-27270, valve means capable of opening and closing the intake passage is connected to an intake passage connecting an intake intake port for taking in air from outside the ship and an intake port of the engine. In addition, the float provided outside the intake passage and the valve means are linked to each other. That is, in this jet propulsion boat, when water outside the ship enters the inside of the hull, the float floats by this water, and the valve means closes the intake passage, so that this water enters the engine from the intake passage. To prevent intrusion.
[0008]
[Problems to be solved by the invention]
As described above, the jet propulsion boat has been devised for water intrusion from the outside of the ship, but apart from this, how the operability is good as a small vessel on which the crew rides Is required.
As described above, the power unit such as the engine 8 and its accessories is disposed in the space 6 having a substantially inverted conical section formed in the lower portion of the seat portion 3. In the case of enlargement, there is a problem that the width and height of the hull 1 are increased, and the steering feeling and maneuverability inherent in the saddle-type small vessel are impaired.
[0009]
Further, an exhaust system such as an exhaust pipe heated to a relatively high temperature is connected to the engine 8, a fuel pump for supplying fuel, an engine control unit constituting an electric control system of the engine 8, and starting of the engine 8 However, in a saddle-type small vessel, the exhaust system and the small auxiliary devices must be disposed in the same space 6 that is closed. For this reason, for example, in order to prevent a situation in which the fuel pump is excessively heated and bubbles are generated in the fuel and the engine output is reduced, or the engine control unit is excessively heated and the function is hindered. It is necessary to devise so that the heat from the plant does not affect these small accessories as much as possible. In particular, in a saddle-ride type small vessel that has to limit the accommodation space 6 of the power unit in order to maintain the steering feeling that it originally has, this necessity is extremely high, and its movement performance is also affected. This is an important issue.
[0010]
Furthermore, an intake system provided with an air cleaner or an exhaust system provided with an exhaust chamber or the like requires a relatively large space for its arrangement. However, since the small auxiliary machines must be disposed together with the intake system and the exhaust system in the space 6 having a substantially inverted conical section having a limited size as described above. Kaga is an important issue in designing a saddle-type small vessel with high motion performance.
[0011]
The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a saddle-ride type small ship in which a power unit is compactly and rationally accommodated in a limited space in the hull.
It is another object of the present invention to provide a saddle-ride type small ship in which a fuel pump and an engine control unit that are relatively heat-sensitive are protected from heat from the engine.
[0012]
[Means for Solving the Problems]
In the saddle-ride type small vessel according to the present invention, a saddle-shaped seat portion is provided at the rear portion of the steering handle, and the engine is installed in a cylinder having a substantially inverted conical section formed in the hull of the lower portion of the seat portion. It is arranged to stand upright in a posture in which the axis is directed to the top of the inverted cone at the center of the ship bottom. An air intake system such as an air cleaner and an exhaust system such as an exhaust pipe are distributed and arranged near the left and right sides of the engine cylinder block in the space, and a cell motor, a fuel pump, Small auxiliary machines such as engine control units are distributed.
[0013]
In the present invention, an intake system such as an air cleaner having a relatively large capacity and an exhaust system such as an exhaust pipe are located in the vicinity of both the left and right sides of a cylinder block that is a relatively large space in a space having a substantially inverted conical section. In addition, small auxiliary machines such as a cell motor and a fuel pump having a relatively small capacity compared to an air cleaner or the like are relatively small in the space having a substantially inverted conical section. It is arranged in the vicinity of the left and right sides of the crankcase that is the place (that is, the lower part limited to the conical shape in the space), and the space is rationally used. In the two-cycle engine, the exhaust pipe is in the form of an exhaust chamber bulged to a large capacity, so that it is particularly necessary to secure a large space as described above.
[0014]
Further, in the present invention, an exhaust system that is relatively high in temperature is disposed in the upper part of the space, while small accessories such as a fuel pump and an engine control unit that need to avoid heating as much as possible are disposed in the lower part of the space. The fuel pump is prevented from being excessively heated by heat convection. Furthermore, since the lower part in the space is in the vicinity of the ship bottom in contact with the water surface, the fuel pump and the engine control unit are arranged at a position where the arrangement environment can obtain a cooling effect by the water temperature.
Furthermore, in the present invention, a fuel pump or an engine control unit is disposed at a position where the engine is sandwiched with respect to an exhaust system such as an exhaust pipe, and radiant heat from the exhaust system to the fuel pump or the engine control unit is transmitted to the engine. Shield and effectively avoid.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A jet propulsion boat according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a partially broken view of the jet propulsion boat of the present embodiment, FIG. 2 shows the structure of a cross section taken along the line AA in FIG. 1, and FIG. A jet propulsion boat is shown.
In the following description, FIG. 4 is also referred to as appropriate, and the same parts as those in FIG. 4 is on the center line of the hull 1, FIG. 1 is shifted from the center line to the side to show the exhaust system.
[0016]
The engine 8 is a three-cylinder two-cycle engine, and stands upright in a position in which the cylinder axis of each cylinder is directed to the top of the inverted conical shape in the center of the bottom of the ship in a space 6 having a substantially inverted conical shape formed in the lower part of the seat portion 3. Arranged. As shown in FIG. 2, a step 40 for supporting a passenger's foot by the upper hull panel 5 is formed on the lower side portion of the seat portion 3, and is defined by the upper hull panel 5 and the lower hull panel 4. A float 41 is provided below the step 40 of the space 6. As a result, the space 6 having a substantially inverted conical section formed in the lower portion of the seat portion 3 and accommodating the power unit is regulated by the seat portion 3 from above, and regulated by the mountain-shaped ship bottom from below and from the side. Is a size regulated by the float 41.
[0017]
The engine 8 has a structure in which three cylinders are arranged in parallel, and a crankshaft is arranged extending in the front-rear direction of the hull 1. In the engine 8, a cylinder block 22 and a cylinder head 23 are sequentially stacked and integrally connected above the crankcase 21, the crankcase 21 is attached to the engine hanger 42, and the engine hanger 42 is connected to the lower hull panel via the mounting block 43. It is attached to the hull 1 by being attached to a boss 44 formed on the boss 4.
Pistons 24 are slidably fitted in the three cylinder holes formed in the cylinder block 22 of the engine 8, and each piston 24 is connected to a crankshaft 25 via a connecting rod 26. Therefore, the crankshaft 25 is rotationally driven as the piston 24 moves up and down, and this rotational driving force is output from the output shaft 13 and the impeller 11 is rotationally driven.
[0018]
An intake port 27 is provided corresponding to each cylinder on one side surface (left side surface in FIG. 2) of the cylinder block 22, and a reed valve 28 is provided in each intake port 27. An intake pipe 29 is connected to each intake port 27, and the intake pipe is connected to an air cleaner 30 via a throttle valve (not shown). The intake pipe 29 is provided with a fuel injector 31 so that fuel from the fuel tank 15 is pumped by the fuel pump 32 and injected from the fuel injector 31.
Therefore, the opening degree of the throttle valve is adjusted by operating a throttle lever (not shown) attached to the steering handle 2, and the air from the air cleaner 30 is supplied to the intake port 27 via the intake pipe 29. At the same time, fuel is injected from the fuel injector 31 into the air, and an air-fuel mixture in which fuel is mixed into the air is supplied into the crankcase 21.
[0019]
Here, the intake port 27 is formed so as to be directed downward toward the crankcase 21, and the air cleaner 30 having a relatively large capacity is arranged near the side of the cylinder block 22 (near the left side in FIG. 2). The intake pipe 29 is connected in the vertical direction between the intake port 27 and the air cleaner 21. The fuel pump 32 is attached to the lower end of the cylinder block 22 via a bracket (not shown), and is disposed near the side of the crankcase 21 (near the left side in FIG. 2).
Accordingly, in one side portion of the space 6 having a substantially inverted conical section formed in the lower portion of the seat portion 3, there is a relatively large component in the vicinity of the upper portion of the cylinder block 22 that is a relatively large space. An air cleaner 30 is disposed, and a fuel pump 32, which is a component having a relatively small capacity, is disposed in the vicinity of the side portion of the crankcase 21 serving as a relatively small space. Although not shown, an engine control unit of an electric control system that controls the ignition timing of the engine 8 and the like is also disposed in the vicinity of the same side of the crankcase 21 together with the fuel pump 32.
[0020]
Exhaust ports 33 are provided corresponding to the respective cylinders on the other side surface (right side surface in FIG. 2) of the cylinder block 22, and exhaust control valves 34 are provided in the exhaust ports 33, respectively. These exhaust control valves 34 are swingably provided near the exhaust opening facing the cylinder hole, and are driven to swing according to the hull propulsion force by a drive control mechanism (not shown). In other words, the exhaust control valve 34 controls the opening area of the exhaust port 33 so as to achieve an optimal exhaust opening ratio according to the operating conditions, and suppresses blow-off of the air-fuel mixture from the combustion chamber to improve fuel consumption and exhaust gas. Realize cleaning.
[0021]
Each exhaust port 33 is connected to an exhaust manifold 35, and is collectively connected to an exhaust chamber 36 via the exhaust manifold 35. The exhaust chamber 36 is connected to a silencer 37 provided at the rear end of the hull in the space 6. Exhaust gas from the exhaust port 33 is exhausted through the exhaust manifold 35, the exhaust chamber 36, and the silencer 37. It is discharged from the mouth to the outside of the hull 1.
Here, the exhaust manifold 35 opens toward the front side of the hull 1 (left side in FIG. 1), and the exhaust chamber 36 has a tip connected to the opening. The exhaust chamber 36 is bent upward and then extended rearward and connected to a silencer 37. The exhaust chamber 36 having a relatively large capacity is located near the other side of the cylinder block 22 (in FIG. 2). The structure is arranged in the vicinity of the right side).
[0022]
A cell motor 38 is attached to the lower end of the cylinder block 22 below the exhaust chamber 36 via a bracket, and the crankshaft 25 is rotationally driven by the cell motor 38, whereby the engine 8 is started. .
Here, the cell motor 38 is attached to the lower end portion of the cylinder block 22 so as to be disposed near the other side portion of the crankcase 21 (near the right side in FIG. 2). Accordingly, in the other side portion of the space 6 having a substantially inverted conical section formed in the lower portion of the seat portion 3, there is a relatively large component in the vicinity of the upper portion of the cylinder block 22 that is a relatively large space. An exhaust chamber 36 is disposed, and a cell motor 38, which is a relatively small component, is disposed in the vicinity of the side of the crankcase 21 that is a relatively small space.
[0023]
As described above, the intake system such as the air cleaner 30 and the exhaust system such as the exhaust chamber 36 are distributed and arranged near the left and right sides of the cylinder block 22 in the space 6, and the cell motor 38 is arranged near the left and right sides of the crankcase 21. And the fuel pump 32 and the engine control unit are distributed and arranged so as to rationally utilize the space 6 having a limited size, and an exhaust chamber 36 that is relatively high in temperature is provided with the fuel pump 32 and the engine. Arranged in the upper part of the space from the control unit, the fuel pump 32 and the engine control unit are prevented from being affected by heat convection as much as possible.
[0024]
Note that, by arranging the fuel pump 32 and the engine control unit below the exhaust system such as the exhaust chamber 36, the influence of thermal convection from the exhaust system as described above can be avoided as much as possible. In particular, the fuel pump 32 and the engine control unit are disposed on one lower side of the engine 8, and the exhaust chamber 36 is disposed on the other upper side of the engine 8, so that the fuel pump 32, the engine control unit, and the exhaust chamber are disposed. The fuel pump 32 and the engine control unit are not directly exposed to the radiant heat from the exhaust chamber 36.
[0025]
The jet propulsion boat having the above-described configuration is operated by an occupant who sits on the seat section 3 with his / her foot on the step 40 and operates the steering handle 2.
The engine 8 is started when the occupant turns on a switch (not shown) to drive the cell motor 38, and the air-fuel mixture supplied from the intake port 27 into the crankcase 21 is combusted from the scavenging port as the piston 24 descends. The air-fuel mixture is supplied into the room, and the air-fuel mixture is compressed and ignited by raising the piston 24. The two-stroke process is repeated by exhausting the exhaust gas through the exhaust port 33 and scavenging again by lowering the piston 24.
[0026]
And the impeller 11 is rotationally driven by the rotational driving force output from the output shaft 13 of the engine 8, the water taken in from the water intake 9 is spouted from the jet nozzle 10, and the hull 1 is propelled ahead.
The angle of the steering blade (not shown) is changed by operating the steering handle 2, and the traveling direction of the hull 1 is changed by changing the jet direction of the water flow using the steering blade.
In this jet propulsion boat, the power unit such as the engine 8 and its auxiliary machines are compactly arranged in the space 6 formed in the lower portion of the seat portion 3, so that the steering feeling and mobility inherent in this type of jet propulsion boat are inherent. You can maneuver with sex.
[0027]
In the above-described embodiment, an example in which a two-cycle engine is mounted is shown. However, in the present invention, the type of engine is not particularly limited, such as a four-cycle engine.
In the above-described embodiments, the jet propulsion type saddle-type small vessel is shown. However, in the present invention, the propulsion type of the vessel is not particularly limited, such as a screw propulsion type.
[0028]
【The invention's effect】
As described above, according to the present invention, the intake system such as the air cleaner and the exhaust system such as the exhaust pipe are distributed and arranged in the vicinity of the left and right sides of the cylinder block, and the small auxiliary machines such as the cell motor and the fuel pump are arranged. Are arranged in the vicinity of the left and right sides of the crankcase, so that the limited-sized, generally inverted conical power unit in the space formed in the lower part of the seat portion can be accommodated in a compact manner. It is possible to realize a saddle-ride type small ship having sufficient mobility. Furthermore, protection of the fuel pump and the engine control unit against the exhaust system heated to a relatively high temperature is realized, and the expected performance of the fuel supply system and the electric control system can be maintained.
[Brief description of the drawings]
FIG. 1 is a side view of a jet propulsion boat according to an embodiment of the present invention, partially broken away.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a plan view illustrating a jet propulsion boat according to an embodiment of the present invention.
FIG. 4 is a side view showing a partially broken example of the jet propulsion boat.
[Explanation of symbols]
1 ... hull, 2 ... steering handle, 3 ... seat,
4 ... lower hull panel, 5 ... upper hull panel, 6 ... space,
8 ... Engine, 21 ... Crankcase,
22 ... Cylinder block, 30 ... Air cleaner,
31 ... Fuel injector, 32 ... Fuel pump,
36 ... exhaust chamber (exhaust pipe), 38 ... cell motor,

Claims (2)

A saddle-shaped seat part is provided at the rear part of the steering handle, and an engine is disposed in a space having a substantially inverted conical section formed in the hull of the lower part of the seat part, so that an occupant gets on the seat part. In saddle-riding small vessels,
The engine is erected in the space with the cylinder axis of the cylinder directed to the top of the inverted cone at the center of the ship bottom,
An air intake system, such as an air cleaner, and an exhaust system, such as an exhaust pipe, are arranged in the vicinity of the left and right sides of the cylinder block located at the top of the engine, and the side on which the exhaust system is disposed is the bottom of the ship saddle riding type small watercraft, characterized in that the fuel pump or engine control unit by arranging the fuel pump or an engine control unit is disposed at a position of the exhaust system and the crosswise across the engine in the vicinity. In the saddle-type small vessel according to claim 1,
A saddle-ride type small vessel characterized in that a cell motor is disposed in the vicinity of the bottom of the ship on the opposite side of the fuel pump or the engine control unit across the engine.

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