JPH05278678A - Towed ship - Google Patents

Abstract

PURPOSE:To mitigate strike against the bottom of a towed ship, of a jetted water from a tow ship and thereby suppress increase in the propulsion resistance by forming a pair of right/left downwardly protruding portions on at least a bow portion of a hull member constituting a ship bottom plate of a towed ship. CONSTITUTION:Protruding portions 5 which downwardly protrudes on both sides of a space length are formed on a ship bottom plate of a towed ship 1. Recesses 4 which are continuous in the back-and-forth direction are defined between both the protruded portions 5 so as to cause the recess portions 4 to float on the water surface during travel, thereby reducing impingement upon the towed ship of a jet water from a water jet opening 6 of the towed ship. Further, the tow ship and the towed ship 1 are connected to each other by a pair of connection members 3, which are constructed such that a mounting member 32 mounted to a mount portion 20 of the tow ship and a mounting member 33 mounted to a mount portion 10 of the towed ship 1 are connected to each other by a connection rod 31. The ends of the connection rod 31 are rotatably mounted about shafts 34, 36 via bushes each consisting of an elastic member such as rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a towed ship towed by a towed ship.

[0002]

2. Description of the Related Art Recently, small-sized jet propulsion boats, which are engine-equipped small boats and are designed to slide on water, have been widely used. Since this ship is small and does not have an extra space for luggage and people, it is necessary to tow a towed ship such as another barge when traveling far. Further, it is preferable that the towed ship has as small an increase in propulsion resistance as possible due to the water jet from the towed ship having the jet propulsion unit at the stern. It is also necessary that the towing vessel be stably towed against various movements. In addition, it is necessary to ensure that the towed ship does not impede the navigation performance of the motorboat that is the towed ship during towing.

A conventional towed ship has an ordinary flat bottom shape, and as a connecting structure between the towed ship and the towed ship, there is a means of simply connecting with a rope or a connecting rod. Has been adopted.

[0004]

In the above-mentioned conventional hull structure, the jet water from the jet propulsion unit provided at the stern portion of the towed ship hits the bottom of the bow of the towed ship, which increases the propulsion resistance. Inevitably, and because the movement of the towed vessel and the movement of the towed vessel differ during the cruise due to the influence of waves, etc., the towing vessel's running performance is hindered especially during turning. There is a problem.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and it is less likely that the water jetted from the motor boat, which is a towed ship, hits the bottom of the bow of the towed ship, and the propulsion resistance is reduced. It is an object of the present invention to provide a towed ship in which the increase in the number of ships is suppressed and the navigation performance is not hindered by the towed ship.

[0006]

A first invention is a towed ship towed by a towed ship equipped with a water jet propulsion unit at the stern, and at least the bow of a hull member constituting a ship bottom plate. Is formed with a pair of left and right projecting portions projecting downward on both sides in the ship width direction, and a ship bottom plate connecting the projecting portions is configured to float above the water surface during traveling.

A second invention is a towed vessel towed by a towed vessel equipped with a water jet propulsion unit at its stern.
At least the bow portion of the hull member that constitutes the ship bottom plate is formed with a pair of left and right protruding portions that project downward on both sides in the ship width direction, and consists of a pair of connecting members that are symmetrically arranged in the ship width direction. The member is a mounting member mounted on the hull of the towed ship and the towed ship, a shaft extending in the ship width direction held by the mounting member, and a connecting rod having both ends connected to the mounting member via the shaft. And a cylindrical sleeve extending in the ship width direction is provided on at least one end of the connecting rod, and the sleeve is externally fitted so as to be rotatable around an axis held by the mounting member. A bush made of an elastic member is interposed between the shaft and the shaft.

The mounting member is preferably mounted on a towed ship or a towed ship so as to be rotatable about its axis.

[0009]

In the structure of the first aspect of the present invention, the jet water from the propulsion unit of the towed ship is prevented from hitting the towed ship, the increase in propulsion resistance is suppressed, and the jet water hits the bow of the towed ship. This also prevents the bow from rising.

In the configuration of the second aspect of the invention, the pair of left and right connecting members are towed in a state where the relative positional relationship between the towed ship (towed ship) and the towed ship is kept constant and the influence of waves or the like is maintained. Relative movement in the up-and-down direction by means of is freely performed, and small relative movements and impact loads in all directions are absorbed by the elastic bush. For this reason, it is possible to prevent excessive stress from being applied to the connecting portion, generate no vibration or noise, and have excellent durability.

[0011]

1 to 4 show a first embodiment of the present invention,
The towed ship 1 includes a motor boat 2 and a connecting means 3 which are towed ships.
The connecting means 3 is composed of a pair of connecting members symmetrically arranged in the ship width direction. The towed vessel 2 is a jet propulsion boat in this embodiment, and is a deck member 22 that constitutes an upper deck 22 and the like.
And a hull member 23 constituting a ship bottom plate and the like are joined together at their peripheral portions, and an engine room is formed inside the hull and an engine is installed. A foot deck 29 is formed on both sides of the rear part on the deck, a seat 25 is formed to project at the center in the ship width direction, and an operation handle 24 is formed on the front side thereof. A propeller that is rotated by an engine (not shown) rotates below the seat 25 in the jet unit, sucks water from the opening 28 at the bottom of the ship, and from the water injection port 6 at the rear end of the jet unit to a predetermined rear part of the stern. Propulsion and turning force are generated by injecting water in the direction.

In the towed ship 1, a deck member 12 and a hull member 13 which constitutes a ship bottom plate and the like are joined together at their peripheral portions, and the hull member 13 projects downward on both sides in the width direction of the ship. A protrusion 5 is formed, and a recess 4 continuous in the front-rear direction is formed between the protrusions 5. The width between the front end portions 53 of the both projecting portions 5 is formed to be substantially the same as the width between both the chine 54 of the motor boat 2. Deck member 1
A cockpit 14 serving as a boarding space is formed at the upper part of the container 2, and a storage case 17 is formed at the rear part thereof so as to project upward, and a seat 15 is formed by the storage case 17 and the lower surface of the cockpit 14. On the rear side of the storage case 17, a storage table 51 formed of a pipe material in a lattice shape is arranged.
An outboard motor (not shown) is attached to the rear end portion 52, so that the outboard motor can run alone.

Handrails 1 are provided on both sides of the cockpit 14.
6 is formed, and the person 100 who sits down on the seat 15 has a storage case 1
7 is used as a backrest and the handrail 16 is grasped.
In this state, the center of gravity G'of the person 100 is located behind the center of gravity G of the towed ship 1 itself, and the stern trim is provided to reduce the propulsion resistance during traveling. Further, as shown in FIG. 1, since the seat 15 of the towed boat 1 is set lower than the seat 25 of the motor boat 2, the seat 2
5 Person 101 on the towed vessel when person 101 is looking backwards
Does not block your view.

As shown in FIGS. 5 to 8, the connecting means 3 is used.
The pair of connecting members constituting the connecting member are a mounting member 32 mounted on the mounting portion 20 of the motor boat 2, a mounting member 33 mounted on the towed vessel 1, and a coupling member having both ends connected to the mounting member. And a rod 31. The mounting member 32 is rotatably mounted on the mounting portion 20 of the motor boat 2 around a mounting shaft 35, and the mounting member 32 holds a shaft 34 extending in the ship width direction. A cylindrical sleeve 38 extending in the ship width direction is provided at one end of the connecting rod 31.
8 is rotatably fitted around a shaft 34 held by the mounting member 32, and a bush 40 made of an elastic member such as rubber is provided between the sleeve 38 and the shaft 34.
Is intervening. The mounting member 33 is the towed vessel 1
Is rotatably mounted on a mounting shaft 37 around the mounting portion 10 of the above, and a shaft 36 extending in the ship width direction is rotatably held by the mounting member 33, and the shaft 36 is coupled to the end of the connecting rod 31. Has been done.

The mounting member 33 side may be connected to the connecting rod 31 via the bush 40 and the sleeve 38, similarly to the mounting member 32. Further, a damper that expands and contracts in the length direction may be used as the connecting rod 31, and the shock force may be absorbed by this damper.

In the above structure, as shown in FIGS. 1 to 3, when a person 101 rides on the motor boat 2 in a state where the motor boat 2 and the towed boat 1 are connected, the towed boat 1 The projecting portions 5 on both sides are submerged in water to form a buoyancy generating portion, the ship bottom plate connecting the projecting portions 5 floats above the water surface, and the recess 4 forms a space above the water surface. On the other hand, the motor boat 2 generates a propulsive force by injecting water from the stern in the central portion in the width direction of the boat, but the jet water 60 is made to flow backward in the recess 4 and the center line 61 of the jet water 60 is generated.
Will pass below the lower surface of the recess 4 between the projecting portions 5, so that it is reduced that the jet water hits the hull of the towed ship 1 and impairs the propulsion efficiency. This state is maintained even when turning. That is, since the connecting members are provided on both sides in the ship width direction and they hardly expand or contract, the relative relationship of the planar arrangement between the towed ship 1 and the motor boat 2 is always kept constant, and therefore the injection from the motor boat 2 is performed. Water will always be jetted rearward through the recess 4 of the towed ship 1. It should be noted that, by mounting a heavy object on the rear part of the towed ship 1, the recess 4 may also be submerged in the stern, but even in that case, if the recess 4 is located on the water surface in the bow, the same as above. In addition, the effect that the jet water hits the hull of the towed ship 1 and impairs the propulsion efficiency is reduced.

Further, the relative positions of the motor boat 2 and the towed ship 1 change drastically in the vertical direction due to the influence of waves or the like, but the end portion of the connecting rod 31 and the mounting member 3 are opposed to this.
Since it rotates about the axis at the connecting portion with 2, 33, it can easily follow. Further, the end portion of the connecting rod 31 and the mounting member 32 are made of a bush 40 made of an elastic material.
Since it is connected via the, the effect of absorbing the deformation such as a slight lateral shift as shown in FIG. 8 is exerted, and the impact force is also absorbed. Also the mounting member 3
Reference numeral 2 functions as a stopper that prevents the sleeve 38 from rotating in the left-right direction over a certain amount. Due to such an action, it is possible to prevent unreasonable stress from being applied to the connecting portion, thereby preventing vibration and noise and exhibiting excellent durability.

9 to 13 show a second embodiment of the present invention. The towed ship 7 has the same basic structure as the towed ship 1, and has a bottom projecting downward on both sides in the ship width direction. A protruding portion 75 is formed, and a recess 74 that is continuous in the front-rear direction is formed between the protruding portions 75. A seat 72 is formed in a substantially central portion in the front-rear direction on the upper portion of the hull, and a storage case 70 is formed on the rear side thereof, and a back wall 71 of the seat 72 is formed by a front wall of the storage case 70. A lid 77 that can be opened and closed is formed under the backrest 71.
By opening and closing, the articles can be taken in and out of the article container 70, and handrails 73 are provided on both sides of the seat 72. Further, a projecting arm 90 forming the connecting means 9 is provided at the end of the bow so as to project forward, and a holding portion 91 having a downward spherical seat is formed at the front end thereof.
On the other hand, a connecting member 92 is provided at the rear end portion of the motor boat 2 as a water jet propulsion boat so as to project rearward, and a spherical body fitted to the holding portion 91 is attached to the rear end portion of the spherical body. It is connected by being fitted to the portion 91, so that the relative orientation of the two hulls in the plane and the trim can be freely changed. Also, the bulwark 26 of the motor boat 2 and the bulwark 76 of the towed ship 7
And are connected by a connecting rope 96 on both left and right sides, and the connecting rope 96 is set so that the same amount of slack is generated in a straight traveling state of both ships 2, 7.

The outboard motor 8 can be attached to the bow of the towed ship 7 as shown in FIGS. 10 and 11, and the impeller 80 can be attached to the outboard surface of the bow water surface by attaching the outboard motor 8. Operate on the bow by immersing it below
It is also possible to sail alone by operating 1.

As shown in FIG. 9, since the seat 72 of the towed vessel 7 is set lower than the seat 25 of the motor boat 2, when the person on the seat 25 looks backward, the towed vessel 7
The view is not blocked by the person above. The relationship between the seat heights of the two ships may be at least as described above when the occupants are on the ships.

In the above structure, as shown in FIG.
When the motor boat 2 is driven and driven while the motor boat 2 and the towed ship 7 are connected to each other, the towed ship 7 becomes a buoyancy generating part because the projecting portions 75 on both sides are submerged in water. The recess 74 is in a state of forming a space above the water surface. On the other hand, the motor boat 2 generates a propulsive force by injecting water from the stern in the central portion in the width direction of the motor boat 2. The jet water 60 is caused to flow backward in the recess 74, and the center line 61 of the jet water 60 is Since it passes below the lower surface of the concave portion 74 between the both projecting portions 75, it can be reduced that the jet water hits the hull of the towed ship 1 and impairs the propulsion efficiency.
Further, when turning, the water injection port 6 at the rear end of the motor boat 2 swings to the left or right to generate a turning force. At this time, the water jetted from the water injection port 6 is slightly projected. Will be hit. When the turning of the motor boat 2 causes the difference in direction between the motor boat 2 and the towed ship 7 to some extent, the connecting rope 96 on the outer side of the turning direction stretches out and tension acts, whereby the towed ship 7 also. The motor boat 2 is made to turn in the same direction as the motor boat 2, and the change in the relative orientation between the towed boat 7 and the motor boat 2 is prevented from becoming excessively large.

Further, the motor boat 2 and the towed ship 1 exert a force for changing the trim or changing the direction due to the influence of waves, but the holding portion 91 of the connecting means 9 is spherical. It is easy to follow because it is connected.

14 to 16 show a third embodiment of the present invention. The towed ship 7 has the same basic structure as the towed ship 1, but only the bow of the towed ship is in the width direction. Protrusions 79 protruding downward are formed on both sides, and a recess 78 is formed between the protrusions 79. Other configurations are the same as above
It is similar to the embodiment. In this way, the protruding part 7 is only on the bow.
9 and the recessed portion 78 are formed, the jetted water 60 from the water injection port 6 is sent from the recessed portion 78 to the lower portion of the ship bottom, so that the increase in propulsive resistance due to hitting the bottom of the towed ship 7 is alleviated. There are advantages. Moreover, since the ship bottom plate forming the rear part of the recess 78 is smoothly inclined forward, the jet water 60 hitting here can be smoothly sent to the lower part of the ship bottom.

[0024]

As described above, in the configuration of the first aspect of the present invention, the jet water from the propulsion unit of the towed vessel is less likely to hit the towed vessel, and the increase in propulsion resistance is suppressed. The bow of the towed ship is prevented from being lifted up by hitting the bow of the towed ship.

In the configuration of the second aspect of the invention, the pair of left and right connecting members are towed in a state in which the relative positional relationship between the towed ship (towed ship) and the towed ship is kept constant, and the towed ship is towed. The relative movement in the vertical direction due to the influence is freely performed, and small relative movements and impact loads in all directions are absorbed by the elastic bush. For this reason, it is possible to prevent excessive stress from being applied to the connecting portion, generate no vibration or noise, and have excellent durability.

[Brief description of drawings]

FIG. 1 is an overall side view showing a towed state of a towed ship by a towed ship according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a bottom view of FIG.

FIG. 4 is a cross-sectional view of a towed ship.

FIG. 5 is a plan view of the connecting means.

FIG. 6 is a side view of the connecting means.

FIG. 7 is an enlarged cross-sectional view of a connecting portion between a connecting rod and a mounting member.

FIG. 8 is a view corresponding to FIG. 7 in a state in which a deformation stress is applied.

FIG. 9 is an overall side view showing a towed state of a towed ship by the towed ship according to a second embodiment of the present invention.

10 is a side view of the towed ship of FIG. 9. FIG.

11 is a plan view of FIG.

FIG. 12 is a rear view of FIG.

13 is a perspective view of FIG.

FIG. 14 is an overall side view showing the towed state of the towed ship by the towed ship, which shows the third embodiment of the present invention.

FIG. 15 is a plan view of FIG.

16 is a bottom view of the towed ship of FIG. 14. FIG.

[Explanation of reference numerals] 1,7 Towed vessel 2 Motor boat (towed vessel) 3,9 Connecting means 4,74,78 Recessed portion 5,75,79 Projection portion 31 Connecting rod 32,33 Mounting member 38 Sleeve 40 Bush

Claims (3)

[Claims] 1. A towed ship towed by a towed ship equipped with a water jet propulsion device at its stern, which projects downward in both sides in the width direction of at least the bow portion of a hull member constituting a ship bottom plate. A towed ship, wherein a pair of left and right protrusions are formed, and a bottom plate connecting the both protrusions is configured to float above the water surface during traveling. 2. A towed vessel towed by a towed vessel equipped with a water jet propulsion device at its stern, which projects downward in at least the bow portion of a hull member constituting a ship bottom plate on both sides in the ship width direction. A pair of left and right projecting portions are formed and are composed of a pair of connecting members symmetrically arranged in the ship width direction, each connecting member being an attaching member attached to the hull of the towed ship and the towed ship, and this attaching member. A shaft extending in the ship width direction, and a connecting rod whose both ends are connected to a mounting member via the shaft, and a cylindrical shape extending in the ship width direction at least at one end of the connecting rod. A sleeve is provided, which is rotatably fitted around a shaft held by the mounting member, and a bush made of an elastic member is interposed between the sleeve and the shaft. Characterized by Towed ship. 3. The towed vessel according to claim 2, wherein the attachment member is attached to the towed vessel or the towed vessel so as to be rotatable around an axis extending in the ship width direction.