JP2003175888A - Water planing boat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water planing boat of which exhaust system is light weight and compact even if a four-cycle engine is used. <P>SOLUTION: In the water planing boat, a multicylinder four-cycle engine 6 and a jet pump 8 are mounted to a hull 14, the exhaust system of which one end is connected to an exhaust port of the multicylinder four-cycle engine 6 and the other end thereof discharges exhaust gas from grouped exhaust manifold pipes 21 through a coupling pipe 23 to the outside of the ship is provided, and the jet pump 8 is operate by the drive of the multicylinder four-cycle engine 6 to propel the water planing boat. In a plan view, a fuel tank 7 is disposed on the center line of the hull, the coupling pipe 23 is disposed between the fuel tank 7 and the multicylinder four-cycle engine 6, and the exhaust system crosses over the center of the hull. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydroplane which propels water by propelling water backward by rotation of an impeller.

[0002]

2. Description of the Related Art A conventional small watercraft is equipped with a two-cycle engine and a jet pump, which are not shown in the figure, and the two-cycle engine is driven to operate the jet pump to move in a predetermined direction. Promote. The two-cycle engine is mounted on the hull, because it does not require an oil pan or valve mechanism, is lightweight and compact, and has a high specific output, making it extremely suitable for small watercraft. It is based on the reason.

However, in a two-cycle engine,
Since the fuel consumption is large and the amount of HC (hydrocarbon, the same applies hereinafter) is large, it is not possible to sufficiently meet the demand for preventing air pollution, river water, lake water, or sea water pollution.
Therefore, in recent years, a 4-cycle engine excellent in fuel consumption rate and HC emission is used to contribute to the prevention of environmental pollution, and in order to secure an output equivalent to that of a 2-cycle engine, a high rotation speed and a large rotation speed are provided. The displacement and the number of cylinders are increased. In particular, we are aiming to achieve a high-speed 4-cycle engine, light weight, compact size, and high output.

As prior art documents relating to this type of watercraft, there are, for example, Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, Patent Document 5, Patent Document 6 and the like.

[0005]

[Patent Document 1] Japanese Unexamined Patent Publication No. 7-237586

[Patent Document 2] JP-A-7-237587

[Patent Document 3] JP-A-7-237588

[Patent Document 4] Japanese Patent Application Laid-Open No. 8-26185

[Patent Document 5] JP-A-8-49596

[Patent Document 6] Japanese Patent Laid-Open No. 8-53098

[0006]

[Problems to be Solved by the Invention]
While using the 4-cycle engine as described above,
In order to achieve an output equivalent to that of a two-cycle engine, high rotation, large displacement, and multi-cylinder are designed, but in this case, the output of the exhaust system is greatly affected,
The shape for satisfying the required performance becomes very complicated. Therefore, there is a problem that it is really difficult to obtain a lightweight and compact exhaust device.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a hydroplane which is capable of obtaining a lightweight and compact exhaust system even when a four-cycle engine is used.

[0008]

In order to achieve the above object, in the present invention, a multi-cylinder 4-cycle engine and a jet pump are mounted on a hull, and one end of the hull is connected to an exhaust port of the multi-cylinder 4-cycle engine. A water slide boat equipped with an exhaust device for discharging exhaust gas from an exhaust manifold, the other end of which is gathered, through a joint pipe to the outside of the ship, and driving the jet pump by driving the multi-cylinder four-cycle engine to propel the jet pump. In a plan view, a fuel tank is arranged on the center line of the hull, the joint pipe is arranged between the fuel tank and the multi-cylinder four-cycle engine, and the exhaust device straddles the center of the hull. It is a characteristic water slide boat. Further, in the present invention, a multi-cylinder 4-cycle engine and a jet pump are mounted on a hull, one end is connected to an exhaust port of the multi-cylinder 4-cycle engine, and the other end is gathered through a joint pipe. A planing boat equipped with an exhaust device for exhausting exhaust gas to the outside of the boat and driving the jet pump by driving the multi-cylinder four-cycle engine to propel the fuel tank and the intake air on the center line of the hull in plan view. An air box for system equipment is provided, the joint pipe is provided between the fuel tank and the air box, and the exhaust device straddles the center of the hull. Further, it is preferable that the joint pipe is disposed below the steering handle of the hull as viewed from the side.

According to the present invention, since a multi-cylinder engine is used, it is possible to take effective measures against exhaust gas as compared with the case where a two-cycle engine is used. Further, since the downstream portions of the plurality of exhaust manifold pipes are combined to form a single outflow portion, the exhaust pulsating pressure generated by one cylinder is used by another cylinder to remove the residual burned gas inside the cylinder. It can be excluded to the outside. Further, since the exhaust pipe that connects the joint pipe and the muffler can be unified, the configuration can be simplified, the cost can be reduced, and the weight can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The water-jet planing boat according to the present embodiment has a water-cooled 4-cylinder engine 6 and a jet pump 8 which are arranged side by side in a front and rear direction in a hull 1, and has an exhaust manifold pipe 2 at an exhaust port of each cylinder of the 4-cylinder engine 6.
1 is connected, and the downstream end portions of the plurality of exhaust manifold pipes 21 are used as the outflow portion 22.
Through the joint pipe 23 to the exhaust pipe 42 of the muffler 48
I am trying to connect to.

The hull 1 is integrally molded of various synthetic resins. As shown in FIG. 1, a steering handlebar 2 rotatable near the front of the center of the upper part of the hull and a seat 3 with a band at the upper rear part thereof. Each of the seats 3 is provided with an unillustrated step for stepping on each of the left and right sides of the seat 3, and an occupant (not illustrated) who straddles the seat 3 operates the steering handle 2 and the like appropriately. Promote gliding on the surface of the water.

The hull 1 is constructed in a structure in consideration of straight running stability and suppression of reaction force. As shown in FIG. 2, a plurality of mount rubbers 4 are mounted in the engine room at a position slightly deviated from the inner center to the front. A large in-line four-cylinder engine 6 is installed in a vertical standing state via a substantially box-shaped mount frame 5. A fuel tank 7 for supplying fuel to the 4-cylinder engine 6 is installed near the rear center of the inside of the hull 1, and a jet pump 8 oriented in the front-back direction of the hull 1 is installed in the pump chamber near the rearmost part of the inner center. Has been done.

The engine compartment is configured to introduce the atmosphere through a plurality of air circulation ducts (not shown). Further, as shown in FIGS. 1 and 2, the four-cylinder engine 6 is provided with a crankcase 9 at a lower portion thereof, and a cylinder 11 having a cylinder head 10 at an upper portion of the crankcase 9.
Are mounted vertically. A crankshaft 12 oriented in the lateral direction of the hull 1 is supported inside the crankcase 9 through a plurality of bearings, and the crankshaft 12 has a power diverting mechanism (not shown) inside the crankcase 9. Are engaged with each other via a bevel gear, and this power diversion mechanism functions to convert the rotational driving force of the crankshaft 12 by 90 °, reduce the speed, and transmit it.

Therefore, the four-cylinder engine 6 is used as a horizontal type instead of the vertical type as in the prior art, and the cylinders 11 are arranged side by side in the horizontal direction of the hull 1. Further, an intake system device 15 including an air box 13 and a carburetor 14 is installed above and in front of the center line of the crankshaft 12, and a lubrication of the four-cylinder engine 6 is provided on one rear side of the centerline of the crankshaft 12. Oil tank 16
Is installed via an oil pipe, and the relatively large space in the front-rear direction is utilized very efficiently.

As shown in FIG. 1 and FIG. 2, the jet pump 8 is provided with a stainless steel impeller shaft 17 that is inclined with respect to the center line of the hull 1, and this impeller shaft 17 serves as the shaft of the power diversion mechanism. It is connected via a rubber coupling 18. An impeller rotating inside the casing 19 is fitted to the end of the impeller shaft 17, and the rotation of the impeller sucks up water from the opening (not shown) of the hull 1, and the water is jetted rearward from the nozzle 20. It

The cylinder 11 is arranged substantially perpendicular to the center line of the impeller shaft 17. A stator (not shown) is fixed inside the casing 19. Further, the nozzle 20 is configured to swing based on the steering operation of the steering handle 2, and this swinging allows the water-sliding boat to be steered. Further, a cooling water inlet (not shown) is provided on the discharge side of the jet pump 8, and the cooling water is supplied to the plurality of exhaust manifold pipes 21 from the cooling water inlet.

As shown in FIGS. 1 to 4, a plurality (four in this embodiment) of exhaust manifold pipes 21 are formed of a plurality of pipes having substantially the same length, and the exhaust of the cylinder head 10 of each cylinder 11 is exhausted. It is curvedly connected to the port and is located behind the crankshaft 12, and its downstream ends gather on the crankcase 9 to form a single outflow portion 22, and this outflow portion 22 penetrates the joint pipe 23. Then connected. The plurality of exhaust manifold pipes 21 form an exhaust system device 24 together with the joint pipe 23, are supported by the mount frame 5, and are located above the crankcase 9.

Each exhaust manifold pipe 21 has a coaxial double pipe structure, and has a long inner pipe 25 and a slightly short outer pipe 2.
A jacket 27 for circulating the cooling water is defined between the inner wall 6 and the inner wall 6. The outer pipe 26 has a nipple 2 at the upstream and downstream thereof.
8, a cooling water inflow pipe 29 is connected to the upstream portion, and a cooling water outflow pipe 30 is connected to the downstream portion.

As shown in FIGS. 3 to 5, the joint pipe 23 is formed by sheet metal working into a plurality of exhaust manifold pipes 21.
And a tapered cylindrical portion 3 that gradually reduces the cross-sectional area from the upstream portion toward the downstream portion.
2 and a diameter-reduced cylinder portion 33, which is an integral structure, is supported by the mount frame 5, and is located above the crankcase 9. The diameter-expanding cylinder portion 31 and the taper cylinder portion 32 have a double wall structure, and a jacket 36 for circulating cooling water is defined between the inner shell 34 and the outer shell 35. A plurality of cooling water inflow pipes 37 are connected to the upstream portion of the outer shell 35 of the portion 31, and a cooling water outflow pipe 38 is connected to the downstream portion thereof.

The plurality of cooling water inflow pipes 37 are connected to the cooling water outflow pipe 30 of the exhaust manifold pipe 21 via a communication pipe 39. The cooling water outflow pipe 38 is connected to the cooling water inflow pipe 46 of the exhaust pipe 42 via a communication pipe 40. Further, the reduced-diameter cylindrical portion 33 has a structure shown in FIG.
As shown in FIG. 5, a mounting joint 41 is fitted and a mounting joint 44 at an upstream portion of the exhaust pipe 42 is connected to the mounting joint 41 via a vibration and shock resistant spherical gasket and a fastener.

The exhaust pipe 42 is bent and formed so as to gradually move from the central portion of the hull 1 toward the side and descends from the upstream portion toward the downstream portion, and is supported by the vibration absorbing support bracket 43. There is. This exhaust pipe 4
2, the mounting joint 44 for the joint pipe 23 is fitted to the upstream portion thereof, and the mounting joint 45 is fitted to the downstream portion thereof. It is connected via a tool. The exhaust pipe 42 has a coaxial double pipe structure similar to that of the exhaust manifold pipe 21, and a jacket for circulating cooling water is defined between an inner pipe and a non-illustrated inner pipe containing a catalyst. Has been formed. The outer pipe is provided with nipples at the upstream and downstream thereof,
A cooling water inflow pipe 46 is connected to the upstream portion, and a cooling water outflow pipe 47 is connected to the downstream portion.

Further, as shown in FIG. 2, the muffler 48 is provided with a plurality of exhaust chambers (not shown) arranged in the upstream and downstream directions,
It is installed inside the hull 1 at one side of the rear part. A plurality of exhaust chambers are communicated with each other, and a connecting joint 49 for a mounting joint 45 at a downstream portion of the exhaust pipe 42 is formed in a connecting pipe 49 extending from the exhaust chamber at an upstream portion to the front side of the hull 1, and the downstream portion. A substantially L-shaped exhaust hose 51, which intersects with the jet pump 8, is connected to the exhaust chamber of FIG. The upstream exhaust chamber is connected to the cooling water outflow pipe 47 of the exhaust pipe 42 via a communication pipe 52.

In the above structure, when an occupant who straddles the seat 3 starts the four-cylinder engine 6, the jet pump 8 is driven to rotate the impeller at a predetermined speed, and the impeller comes out of the opening of the hull 1. Suck up water, nozzle 20
Water is sprayed backward from. Propulsive force is generated by the jetting action of this water, and the hydroplane boat glides on the water surface. At this time, the exhaust gas sequentially passes from the exhaust port of the four-cylinder engine 6 through the exhaust manifold pipe 21, the joint pipe 23, the exhaust pipe 42, and the muffler 48, and is exhausted from the stern of the hull 1 to the outside of the ship through the exhaust hose 51. .

Further, when the four-cylinder engine 6 is started, cooling water (indicated by an arrow) consisting of seawater or lake water flows into the cooling water intake port, and the exhaust manifold pipe 21 is passed from the cooling water intake port through the communication pipe. The jacket 27, the jacket 36 of the joint pipe 23, and the jacket of the exhaust pipe 42 are sequentially supplied with water to cool the overheated exhaust manifold pipe 21, joint pipe 23, exhaust pipe 42, and catalyst. The cooling water that has cooled the exhaust manifold pipe 21, the joint pipe 23, the exhaust pipe 42, and the catalyst in this way passes through the muffler 48 from the jacket of the exhaust pipe 42, flows into the exhaust hose 51, and is then discharged to the outside of the ship.

According to the above construction, since the four-cylinder engine 6 is used, HC is significantly reduced as compared with the two-cycle engine, and an effective exhaust gas countermeasure can be taken. Further, since the downstream end portions of the plurality of exhaust manifold pipes 21 are gathered on the crankcase 9 to form the single outflow portion 22 by using the joint pipe 23, the exhaust pulsating pressure generated by a certain cylinder is Cylinder 11
It is possible to remove the residual burnt gas inside the cylinder to the outside of the cylinder 11. Therefore, it is possible to remarkably increase the filling efficiency of the intake air, and it is possible to remarkably improve the output of the engine 6. In addition, the joint pipe 23
Since the exhaust pipe 42 that connects the exhaust pipe 42 and the muffler 48 can be unified, the configuration can be simplified, the cost can be reduced, and the weight can be reduced.

Further, unlike the prior art, since the joint pipe 23 is formed by sheet metal working, it is possible to reduce the wall thickness, and it is possible to obtain a very lightweight exhaust device in spite of forming the jacket 27. it can. Furthermore, since the shapes of the plurality of exhaust manifold pipes 21 can be freely set, the structure is simplified, the cost is reduced, the weight is reduced, the degree of freedom in design is increased, and the performance of the four-cylinder engine 6 is significantly improved. Can be expected. Due to the above, the 4-cycle engine 6
Even if is used, a lightweight and compact exhaust device can be obtained very easily. Further, since the cylinder 11 is set substantially perpendicular to the center line of the impeller shaft 17, the intake system device 15 and the exhaust system device 24 can be arranged in a straight line, through which the intake resistance and the exhaust resistance can be reduced. It is possible to reduce the air flow rate and the intake air filling efficiency and the exhaust air efficiency.

Further, since the exhaust pipe has a double pipe structure and the flow passage for the cooling fluid is defined between the inner pipe and the outer pipe, the cooling fluid flows into the flow passage of the exhaust pipe, and Each of the pipe and the outer pipe is cooled to effectively solve the problem associated with the high temperature. Further, since the joint member is formed by sheet metal working, the joint member is not formed by a casting means such as aluminum casting which causes thickening, but the plate material is squeezed and cut,
Alternatively, since it is configured by plastic working such as bending, it is possible to make it difficult to reduce the wall thickness. Further, the shapes of the plurality of exhaust manifold pipes can be freely set. Further, since the joint member has a double structure and a flow passage for the cooling fluid is formed between the inner wall and the outer wall of the joint member, the cooling fluid flows into the flow passage of the joint member to form the inner wall and the outer wall of the joint member, respectively. Cooling effectively eliminates problems associated with high temperatures.

In the above embodiment, the 4-cylinder engine 6 is used.
However, the present invention is not limited to this, and for example, an engine having two cylinders, three cylinders, or five cylinders or more may be used. In addition, the crankshaft 12 is arranged in the front-back direction of the hull 1.
You may turn to. Further, the number of exhaust manifold pipes 21, the number of support brackets 43, the number of catalysts, or the like can be appropriately increased or decreased. Further, the lengths of the plurality of exhaust manifold pipes 21 can be changed as appropriate.
Also, other cooling fluids can be used as appropriate. Also, the exhaust manifold pipe 21 and / or the joint pipe 2
3 may be supported by the crankcase 9. Further, the joint pipe 23 may have a double pipe structure.

Further, as a connecting method of each pipe, a screwing type, a butt welding type, an insertion welding type, a biting type, a flare type or the like can be appropriately used.
Further, the inner pipe 25 that defines the jackets 27 and 36
It goes without saying that a plurality of cooling fluid ejection holes may be formed in the inner shell 34.

[0030]

As described above, according to the present invention, it is possible to obtain a lightweight and compact exhaust system even if a four-cycle engine is used. Further, since the exhaust pipe that connects the joint pipe and the muffler can be unified, the configuration can be simplified, the cost can be reduced, and the weight can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of a hydroplane according to the present invention.

FIG. 2 is a cross-sectional plan view showing an embodiment of a hydroplane according to the present invention.

FIG. 3 is an enlarged explanatory view of a main part showing an embodiment of a watercraft according to the present invention.

FIG. 4 is a front view showing an exhaust manifold pipe and a joint member in the embodiment of the watercraft according to the present invention.

5 is a cross-sectional explanatory diagram of FIG.

[Explanation of symbols]

1 hull 4 mount rubber 5 mount frame 6 4-cylinder engine (multi-cylinder engine) 7 Fuel tank 8 Jet pump 9 crankcase 10 cylinder head 11 cylinders 12 crankshaft 21 Exhaust manifold pipe 22 Outflow section 23 Joint pipe (joint member) 24 Exhaust system equipment 25 inner tube 26 outer tube 27 jacket (flow passage) 31 Expanding cylinder 32 Tapered tube 33 Reduced diameter cylinder 34 Inner shell 35 outer shell 36 jacket (flow passage) 42 Exhaust pipe 43 Support bracket 48 Muffler 51 Exhaust hose

Continued front page    (72) Inventor Yasuaki Yadakai             300, Takatsuka-cho, Hamamatsu City, Shizuoka Prefecture Suzuki shares             In the company F term (reference) 3G004 AA05 BA06 BA09 CA15 DA11                       DA14 EA06

Claims (3)

[Claims] 1. A multi-cylinder 4-cycle engine and a jet pump are mounted on a hull, one end is connected to an exhaust port of the multi-cylinder 4-cycle engine, and the other end is exhausted from an exhaust manifold through a joint pipe. In a water-plane planing boat equipped with an exhaust device for discharging gas to the outside of the ship and driving the jet pump by driving the multi-cylinder four-cycle engine, a fuel tank is arranged on the center line of the hull in plan view. A water-plane planing boat, wherein the joint pipe is arranged between the fuel tank and the multi-cylinder 4-cycle engine, and the exhaust device straddles the center of the hull. 2. A multi-cylinder 4-cycle engine and a jet pump are mounted on a hull, one end of which is connected to an exhaust port of the multi-cylinder 4-cycle engine and the other end of which is exhausted from an exhaust manifold through a joint pipe. A water-plane planing boat equipped with an exhaust device for discharging gas to the outside of a ship, which drives the multi-cylinder 4-cycle engine to drive the jet pump to propel the fuel tank and an intake system device on a center line of the hull in plan view. The water jet plane, wherein the air box is provided, the joint pipe is provided between the fuel tank and the air box, and the exhaust device straddles the center of the hull. 3. The hydroplane according to claim 1, wherein the joint pipe is disposed below a steering handle of a hull in a side view.