JP2904443B2 - Water jet propulsion system for small boats - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet propulsion system for a small boat.

[0002]

2. Description of the Related Art Conventional water jet propulsion systems for small boats include Japanese Utility Model Publication No. 49-16059 (known example 1), U.S. Pat. No. 3,12,1994 (known example 2) and Italian patent specification 95886.
No. 9 (known example 3) and the like are known.

[0003] The water jet propulsion device of the known example 1 is
A steering valve is tiltably arranged in the discharge pipe, and a pair of water pipes extending right and left from the downstream part of the steering valve to the discharge pipe and opening on the side of the hull and the rear end opening can be opened and closed. A forward / backward switching valve is provided, and the forward / backward switching is performed by opening / closing the rear end opening of the discharge pipe with the forward / backward switching valve, and steering is performed by tilting the steering valve. The same applies to the known example 2, and the description thereof is omitted.

[0004] The water jet propulsion device of the known example 3 is
A deflector nozzle is attached to the rear end of the diffuser so as to be swingable in the left and right direction, and outlets for backward movement are formed on the left and right sides of the front end of the deflector nozzle, respectively.
In addition, a baffle for switching between forward and backward movement is provided at the rear end of the deflector nozzle so that the rear end opening of the deflector nozzle can be opened and closed.

[0005]

However, in the water jet propulsion device of the prior art 1, since the steering valve is provided in the discharge pipe through which the jet water flows, the steering valve becomes an obstacle, and the water jet propulsion device has a problem with respect to the jet water flow. There is a problem that resistance is large.

Further, in the water jet propulsion device of the prior art 3, although it is considered that the above-mentioned problem does not occur, the water jet propulsion device connects the front end of the deflector nozzle having the rear outlet to the rear end of the diffuser. However, there is a problem in that the opening area or position of the steering outlet is restricted by the deflector nozzle, and the degree of freedom in design is small.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a water jet propulsion device which has low resistance to the flow of water and has a large degree of freedom in design.

[0008]

To achieve the above object, according to an aspect of this invention is mounted on a rear portion of the hull, the intake portion to the front end, and the pump housing to the nozzle portion is formed in the rear end portion, the pump A water jet propulsion device for a small boat, which has an impeller housed in a housing, and which rotates the impeller to eject water sucked from an intake portion toward a hull rearward from a nozzle portion to generate a propulsion force. Insert a vertical shaft into the nozzle of the pump housing.
A scan tearing nozzle mounted for rotation around, defining a reverse chamber in which the nozzle unit and the steering nozzle is fixed to the pump housing is accommodated in the nozzle portion and a position facing the rear Reverse with an opening that opens the reverse chamber backwards
And Shitsuga formed member, the reverse chamber The reverse chamber defining the member
Each rear end is open on the left and right sides of the ship , and each front end is on the left and right sides of the ship
A pair of right and left reverse water guide pipes each of which is directed toward the front toward the front and open, and a horizontal shaft to the reverse chamber defining member
A reversing basket that is rotatably mounted around the opening and that opens and closes an opening that opens toward the rear of the reverse chamber defining member; and a reverse chamber that is provided on left and right sides of the steering nozzle. The reverse guide opening to the left and right of the
The amount of opening of the opening at each rear end of the water pipe should be
And a pair of chopper valves.

[0009]

According to the water jet propulsion device of the present invention, steering can be performed by turning the steering nozzle in the left-right direction, and no obstacle to the flow of water such as a valve is disposed in the pump housing. Can be smaller. In addition, since the reverse headrace pipe that opens diagonally forward into the reverse chamber is connected, a great degree of freedom can be obtained in the design of the diameter or connection position of the reverse headrace pipe. The design for reducing the resistance of the reverse water guide pipe at the time of reverse travel to close the rear end opening of the component member is also facilitated. Also this water jet propulsion device
Is a reverse water pipe that opens a water conveyance pipe to the side of the hull.
Connects to the nozzle, and the reverse nozzle
To get a larger yaw moment
You.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a watercraft propulsion system for a small boat according to an embodiment of the present invention. FIG. 1 is a plan view of the small boat, FIG. 2 is a sectional side view of the same, and FIG. FIG. 4, FIG. 4 is a sectional view of the same side, FIG. 5 is a partially enlarged plan sectional view of the water jet propulsion device, and FIG. 6 is a sectional view of the same side.

1 and 2, reference numeral 11 denotes a hull in which a hull (lower hull) 12 and a deck (upper hull) 13 are joined.
It is composed of a resin such as P. Partition wall 1 inside hull 11
Trunk room TR, center room CR according to 4,15
The engine room ER is divided into front and rear. The trunk room TR is a storage space, and the center room CR has a fuel tank 40 and an engine room E.
The engine 50 and the propulsion unit 60 are housed in R.

The deck 13 has openings 17 and 18 at the front and rear, respectively, and a concave cabin 16 opening upward at the center. The front opening 17 is opened in the trunk room TR and is opened and closed by a lid 19, and the rear opening 18 is opened in the engine room ER and is opened and closed by a hood 20.

The cabin 16 has an opening 21 formed in the bottom wall, and a steering device 23 mounted on the front wall. The opening 21 opens in the center room CR, and the cover member 24
To be opened and closed. The steering device 23 is configured by attaching a steering handle (operating stick) 25 or the like to the steering post 22, and the steering handle 25 or the like is connected to the propulsion unit 60 or the like by a cable or the like. The steering post 22 has a base end fixed to the front wall of the cabin 16 at a position deviated leftward and upward, and a distal end extending upward at an angle.
The steering handle 25 is attached to the steering post 22 at the front end (rear end) so as to be tiltable. The steering handle 25 is connected to a steering shaft 25a in the steering post 22.

In the cabin 16, a driver seat 26 and a passenger seat 27 are provided independently of each other. The driver's seat 26 and the passenger's seat 27 are spaced apart from each other in front and rear and left and right, that is, staggered, and the driver's seat 26 is located behind the steering device 23 on the left side of the hull 11 and The passenger seat 27 is located on the right side of the hull 11.

As shown in FIGS. 3 and 4, the propulsion unit 60 is constructed by rotatably housing an impeller 63 fixed to the lower end of an impeller shaft 62 in a pump housing 61. The pump housing 61 is formed of a cylindrical member that curves gently rearward and upward, has an intake portion 64 that opens at the front end of the hull 12 at the bottom, and a nozzle portion 65 that opens at the rear end of the hull 12 at the stern. It is connected.
In the pump housing 61, a peripheral edge of the intake portion 64 is fixed to an inner surface of the bottom of the hull 12 by a bolt penetrating the outer set plate 67.

The nozzle portion 65 is formed integrally with a reverse body (reverse chamber defining member) 66a, is located in a hole 12f formed in the stern portion of the hull 12, and opens right behind the hull 11. The nozzle portion 65 has a steering nozzle 68 at the rear end, and a vertical shaft 68a shown in FIG.
The water is ejected from the nozzle portion 65 so as to be rotatable in the left and right directions as a center.
Can be changed by

The reverse body 66a is provided on the inner surface of the stern of the hull 12 on the outer side of the reverse cover (reverse chamber defining member).
The reverse body 66a and the reverse cover 66b surround the hole 12f at the stern of the hull 12 from inside and outside to define a reverse chamber 66 together with the bolt 66b. Joints 69a, 69a are fixed to the right and left sides of the nozzle portion 65 on the reverse body 66a.
a, 69a are connected to the reverse pipes 69, 69. The joints 69a, 69a open to the reverse chamber 66 and connect the reverse chamber 66 to the reverse pipes 69, 69.

The reverse cover 66b is fixed to the outer surface of the stern of the hull 12, and covers the steering nozzle 68 in the vertical and horizontal directions, that is, around the steering nozzle 68 except for the rear. An opening 66f is formed at the rear of the reverse cover 66b, and a reverse bucket 72 is attached to the rear of the reverse cover 66b so that the opening 66f can be opened and closed.

The steering nozzle 68 has a cylindrical shape whose diameter is reduced toward the rear, is accommodated in a reverse chamber 66, and is surrounded by a reverse cover 66b. The front end of the steering nozzle 68 fits with the outer periphery of the nozzle portion 65 of the pump housing 61, and the upper and lower ends of the front end are supported by the pump housing 61 so as to be rotatable about a vertical axis.

Chopper valves 70, 70 are provided on the left and right sides of the steering nozzle 68, respectively.
Openings 9 and 69 to the reverse chamber 66 are integrally formed so as to be openable and closable, and a cable 71 connected to the steering handle 25 is locked on the left side. The steering nozzle 68 responds to the steering of the steering handle 25 to change the flow direction of the water spouting from the nozzle portion 65, and to open the reverse pipes 69, 69 to the reverse chamber 66 with the chopper valves 70, 70. Open and close selectively.

The reverse pipes 69, 69 are respectively
The front end extends substantially obliquely right and left, and the front end is a reverse nozzle 69b.
Connect to 69b. The reverse nozzles 69b, 69b
The hull 12 is fixed to a side inner surface with bolts, and opens to the outer side surface of the hull 12 obliquely forward. As described above, the openings of the reverse pipes 69, 69 to the reverse chamber 66 are opened and closed by the chopper valves 70, 70.

The reverse bucket 72 has a substantially inverted U-shape in a rear view and a fan shape in a side view in which a valve plate 72a capable of opening and closing an opening of a reverse cover 66b is integrally formed between a pair of side plates 72b, 72b. Are located on the left and right sides of the inner surface of the reverse cover 66b, respectively .
(Horizontal axis) It is rotatably connected around 72c .
The reverse bucket 72 has a cable 7 on the right side plate.
3 is locked, and is connected to the forward / reverse switching lever of the control device 23 by the cable 73. This reverse bucket 72
Responds to the operation of the forward / reverse switching lever, and closes the opening 66f of the reverse cover 66b during reverse travel (see FIG. 6).

The impeller shaft 62 includes a pump housing 61
, Extends obliquely rearward, and penetrates through a hollow pivot shaft 74 fixed to the upper part of the pump housing 61, and the upper end protrudes into the case 81. The impeller shaft 62 has the impeller 63 fixed to the lower end as described above,
The upper, middle and upper ends of the impeller 63 are each supported by bearings, and the upper end is connected to the crankshaft 51 of the engine 50 by a belt transmission 80.

As shown in FIG. 4, the belt transmission 80 has a case 8 formed by joining a cover 81b to a main body 81a.
1 and a belt 84 is mounted between the driven pulley 82 and the drive pulley 83. The main body 81a of the case 81 has the above-described pivot shaft 7 at the lower front part.
4 supported. This case 81 has a cover 81b with a hole 86 for taking in cooling air at a position above the drive pulley 83.
Are formed.

The driven pulley 82 is fixed to the upper end of the impeller shaft 62, and the drive pulley 83 is fixed to a rotating shaft 85 provided on the crankshaft 51 of the engine 50. The drive pulley 83 is provided with a cooling fan 83a at the upper part. This belt transmission 80
Transmits the power of the engine 50 to the impeller shaft 62.

The engine 50 is composed of a two-cylinder two-cycle engine.
Is mounted via a mount 53. This engine 5
0 is the cylinder head 5 with the crankcase 54 on the front side.
5 is located on the rear side, and the crankshaft 51 is mounted so as to extend obliquely rearward and upward in parallel with the impeller shaft 62 described above. As described above, the rotating shaft 85 is provided at the upper end of the crankshaft 51 so as to be coaxial and integrally rotatable, and the flywheel 56 is fixed below the rotating shaft 85. The engine 50 is provided with a throttle valve 2
3 is connected to an accelerator grip (accelerator lever).

In the water jet propulsion system for a small boat according to this embodiment, the propulsion unit 60 rotates by the impeller 63 being driven by the engine 50.
With the rotation of 3, the water is sucked from the intake portion 64 and the sucked water is jetted rearward from the nozzle portion 65 as a jet stream. In addition, since no object that obstructs the flow of water is arranged in the pump housing 61, the resistance can be reduced.

Here, during forward movement, the reverse bucket 72 rotates clockwise from the position shown in FIG. 6 so that the valve portion 72a is located above the opening 66f of the reverse cover 66, and the opening 66f of the reverse cover 66 is opened. Is released (see FIG. 4). For this reason, the jet water jet spouting from the nozzle portion 65 flows backward through the opening 66f of the steering nozzle 68 and the reverse cover 66, and generates a forward thrust. Then, the steering nozzle 68 turns according to the steering of the steering handle 25 to change the direction of the jet water flow, and the hull 11 is steered by the rotation of the steering nozzle 68.

When the vehicle is moving backward, as shown in FIG. 6, the reverse bucket 72 rotates counterclockwise from the above-described forward position, and the valve portion 72a covers the opening 66f of the reverse cover 66. . For this reason, the jet water jet spouted from the nozzle portion 65 flows into the reverse pipes 69, 69 from the joints 69a, 69a, and
After passing through 69, the reverse nozzles 69b, 69b squirt obliquely forward, and a backward thrust is obtained. At this time, the reverse pipes 69, 69, that is, the joints 69a, 69a
The diameter and position of the nozzle can be designed without being restricted by the nozzle portion 65, and the diameter can be easily increased, so that a jet water flow with a sufficient amount of water can be obtained, and the backward thrust can be increased.

Even when the vehicle is moving backward, the rotation of the steering nozzle 68 causes the left and right reverse pipes 69 and 6 to rotate.
9 is selectively throttled by one of the chopper valves 70, 70 to control the opening degree of the opening, and thereby the reverse pipes 69, 6
Steering is performed by changing the amount of water spouting from the left and right. Even in this case, since the reverse pipes 69, 69 are connected to the reverse cover 66b through the joints 69a, 69a having large diameters and open to the inside, the resistance of the jet water jet that jets forward when the vehicle moves backwards should be reduced. And obtain sufficient propulsion.

7 and 8 show another embodiment of the present invention. FIG. 7 is a plan view of a small boat, and FIG. 8 is a side view of the same. Hereinafter, the same portions as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, an engine 50 is mounted on a front portion of a hull 11, and a fuel tank 40 is disposed at a central portion of the hull 11 between the engine 50 and a propulsion unit 60.

As is apparent from FIG. 8, the engine 50 is connected to the impeller shaft 62 of the propulsion unit 60 via an intermediate shaft 87 so as to be able to transmit power, and the intermediate shaft 87 is connected to the fuel tank 40.
Is arranged in a concave portion 40a formed in the front-rear direction. In FIG. 8, reference numeral 88 denotes a cock for switching reserve fuel.

Also in this embodiment, the resistance in the flow path of the jet water flow in the pump housing 61 or the like can be reduced, and the resistance at the time of reverse movement can be reduced to obtain a large propulsive force at the time of reverse movement.

In each of the above-described embodiments, the water jet propulsion device is shown in which the reverse pipes 69, 69 are extended to the side of the hull 11 and assembled to the hull 11, but the water jet propulsion device of the present invention is a reverse type. Pipe 69, 6
It is also possible to shorten 9 and configure it as an outboard motor.

[0036]

As described above , according to the present invention,
Mounted at the rear of the hull, with an intake at the front end and a rear end
Pump housing with a nozzle section
And an impeller housed in a pump housing.
The nozzle sucks water sucked from the intake by the rotation of the impeller.
A small type that generates propulsion by squirting from the section toward the rear of the hull
Pump housing for water jet propulsion system
Rotatable around the vertical axis of the nozzle
Attached steering nozzle and pump housing
The nozzle portion and the steering knob
A reverse chamber is defined in which the chisel is housed.
Open the reverse chamber backwards at a position facing the
A reverse chamber defining member having an opening formed therein;
Each rear end is opened on the left and right sides of the reverse chamber in the room defining member.
With their front ends on the left and right sides of the hull,
A pair of left and right reverse water pipes that open toward
The chamber defining member is rotatably mounted about a horizontal axis.
Attached and opened toward the rear of the reverse chamber defining member
A reverse basket that opens and closes the opening and stearin
On the left and right sides of the reverse nozzle,
Opening of the opening at each rear end of the reverse running water pipe that opens
A pair of chopper bals that change the mouth volume reciprocally
With this arrangement, the resistance to the flow of the jet water flow can be reduced, and the reverse pipe and the like can be arranged without being restricted by the nozzle portion, and the degree of freedom in design can be increased.

In particular, according to the present invention, steering is performed by swinging a steering nozzle provided in a pump housing of a propulsion device during forward movement, so that steering during forward movement can be effected reliably, easily, and similarly to a conventional steering device of this type. In addition, when the vehicle is moving backward, a reverse chamber configured with a reverse defining member provided in the pump housing and a reverse bucket that opens and closes the rear are provided, and by closing the reverse bucket,
Energy is stored as pressure once in the reverse chamber,
By controlling this with a chopper valve provided in the steering nozzle when discharging this, it is possible to obtain arbitrary water to be sprayed forward. Therefore, propulsion during reverse travel can be performed reliably and efficiently, and steering during reverse travel is performed by controlling the opening degree of one opening of the left and right water guide pipes by the chopper valve. The degree of opening of the opening of the pipe can be continuously changed, whereby the water amounts of the left and right water guide pipes can be changed in proportion to the area ratio of the openings of the left and right water guide pipes. The flow velocity of the water is increased as compared to the other, and an arbitrary, reliable, and smooth steering can be performed.

In the present invention, the opening of the left and right water guide pipes is controlled by swinging the chopper valve provided on the steering nozzle by swinging the steering nozzle provided on the nozzle in the pump housing. Because the steering device that performs the steering operation during forward movement can be shared, steering during reverse movement can be performed.Since steering during reverse movement is also performed by controlling the opening of the chopper valve, Steering according to the conditions of the time can be performed smoothly and reliably. Again
Akira extended the reverse pipe to the side of the hull and opened it.
Therefore, in addition to the above effects, large yaw
Is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a small boat to which an embodiment of the present invention is applied.

FIG. 2 is a side sectional view of the small boat.

FIG. 3 is a plan view of a water jet propulsion device according to one embodiment of the present invention.

FIG. 4 is a side sectional view of the water jet propulsion device.

FIG. 5 is an enlarged plan sectional view of a main part of the water jet propulsion device.

FIG. 6 is an enlarged side sectional view of a main part of the water jet propulsion device.

FIG. 7 is a plan view of a small boat to which another embodiment of the present invention is applied.

FIG. 8 is a side sectional view of the small boat.

[Explanation of symbols]

11 Hull, 50 Engine, 60 Propulsion Unit, 61 Pump Housing, 63 Impeller, 64
... Intake part, 65 ... Nozzle part, 66 ... Reverse chamber, 66a ... Reverse body (reverse chamber defining member), 66b ... Reverse cover (Reverse chamber defining member), 68 ..Steering nozzle, 68a ... vertical
Shaft, 69 ... reverse pipe, 69a ... joint, 69b ...
・ Reverse nozzle, 70 ... Chopper valve, 72 ... Reverse bucket, 72c ... Sidewise shaft .

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-254094 (JP, A) JP-A 1-132497 (JP, U) JP-A 49-16059 (JP, Y2) (58) Survey Field (Int.Cl. ⁶ , DB name) B63H 11/00-11/117

Claims (1)

(57) [Claims] 1. A pump housing mounted on a rear part of a hull, having an intake part at a front end part, a nozzle part formed at a rear end part, and an impeller housed in the pump housing. In a watercraft propulsion device for a small boat that generates propulsion by ejecting water sucked from an intake portion by rotation toward a rear of a hull from a nozzle portion, a vertical axis is centered on a nozzle portion of the pump housing.
A scan tearing nozzle mounted for rotation as defines the reverse chamber in which the nozzle unit and the steering nozzle is fixed to the pump housing is accommodated, the reverse in the nozzle portion and a position facing the rear A reverse chamber defining member having an opening for opening the chamber rearward, and a rear end on each of the left and right sides of the reverse chamber in the reverse chamber defining member.
Parts are open and each front end is forward on the left and right side of the hull , respectively.
A pair of right and left reverse water guide pipes that open to face toward each other, and are attached to the reverse chamber defining member so as to be rotatable about a horizontal axis, and are provided at the rear of the reverse chamber defining member.
And reverse basket for opening and closing an opening that opens toward, is provided on the left and right sides of the steering nozzle, Riva
Rear ends of the reverse water pipes that open to the left and right of the storage chamber
A water jet propulsion device for a small boat, comprising: a pair of chopper valves that reciprocally change an opening amount of an opening of the section .