JPH04310496A - Propelled vessel - Google Patents

Abstract

PURPOSE:To reduce propelling resistance at the time of propulsion by a propelling vessel fitted in an interfit recess portion by smoothly connecting the ship's bottom of a bow portion in a propelled vessel to the lower surface of a reinforcing plate in the longitudinal direction of the hull. CONSTITUTION:A space surrounded with right and left side portions 21, 21 integrally extended backward from the bow portion 20 and a reinforcing plate 22 for connecting both lower ends thereof to each other is provided as an interfit recess portion 23 in a hull 19 of a propelled vessel 18. The interfit recess portion 23 is opened upward and backward, so that a bow portion 24 of a water jet pusher hull 2 is removably fitted therein and the engagement state is kept while the bow portion is pressed forward by bands 27, 27. The front portion of the interfit recess portion 23 is formed by an upper plate 35, and the upper plate 35 is formed in such a manner as to be laid along the ship's bottom of the bow portion 24 of the pusher boat 1. The ship's bottom 36 including the bow portion 20 of the propelled vessel 18 and the lower surface of the reinforcing plate 22 are smoothly continuously formed in the longitudinal direction of the hull 19 and in the lateral directions. Accordingly, at the time of propulsion, the generation of an eddy in the water in the rear of the ship's bottom can be prevented.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] This invention provides a means for moving a boat to a desired position by a propulsion vessel, such as a water jet propulsion boat.
This invention relates to a propelled ship used as a floating base for water jet propulsion boats.

0002

2. Description of the Related Art For example, when the above-mentioned water jet propulsion boat is used for leisure purposes, a propelled boat is sometimes used as a floating base for taking off and taking off the boat. In this case, the water jet propulsion boat is used to move the propelled vessel to a desired position, such as offshore. To explain this more specifically, a fitting recess into which the water jet propulsion boat is removably inserted is formed at the stern of the propelled boat. If the water jet propulsion boat is propelled with the water jet propulsion boat fitted into this fitting recess, the propelled boat will be moved to a desired position. In such a propelled ship, a pair of left and right side portions extend rearward from the bow portion so as to be located on both sides of the fitting recess, but the left and right side portions are connected to each other in order to increase the strength of the hull. A reinforcing plate is provided.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned conventional structure, there is a problem in how to provide the reinforcing plate. In other words, when a level difference occurs between the bottom of the bow of the propelled vessel and the reinforcing plate in the longitudinal direction (longitudinal direction) of the hull, when the propelling vessel propels the propelled vessel, the rear end of the bottom of the bow A problem arises in that a large number of vortices are generated in the water from the edge toward the rear, and these vortices obstruct the above-mentioned propulsion and unnecessarily increase the propulsion resistance.

0004

[Purpose of the Invention] This invention was made in view of the above-mentioned circumstances, and it is possible to suppress the propulsion resistance to a small level in a propelled ship that is propelled by a propulsion ship fitted into a fitting recess. The purpose is to do so.

[0005]

[Means for Solving the Problems] The present invention is characterized in that the bottom of the bow of a propelled ship and the lower surface of the reinforcing plate are smoothly continuous in the longitudinal direction of the ship. This is what I did.

[0006]

[Operation] The operation of the above structure is as follows. The bottom 36 of the propelled ship 18 and the lower surface of the reinforcing plate (bottom plate) 22 connecting the left and right side parts 21, 21 constituting the propelled ship 18 are arranged to be smoothly continuous in the longitudinal direction of the hull 19. . For this reason, water jet propulsion boats (propulsion boats)
1, when the propelled ship 18 is propelled, generation of a vortex 33 in the water 32 behind the bottom 36 of the bow section 20 is suppressed.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. (First Embodiment) FIGS. 1 to 4 show a first embodiment.

1 to 3, reference numeral 1 denotes a water jet propulsion boat which is a propulsion vessel, and an arrow Fr in the figure indicates the forward direction of the water jet propulsion boat 1 in the propulsion direction. The water jet propulsion boat 1 has a hull 2 made of FRP, and a handle support part 3 is protruded from the upper surface of the midway part of the hull 2, and a bar handle 4 can be freely steered on the handle support part 3. is supported by. A seat 5 is provided on the rear portion of the hull 2, and footrest surfaces 6, 6 are formed on the left and right sides of the seat 5. Then, the occupant straddles the seat 5 and places his/her feet on the footrest surface 6 while holding the bar handle 4.
It is now possible to operate the steering wheel.

A duct 8 having a circular cross section and extending in the longitudinal direction is provided at the rear of the hull 2, and this duct 8 is bent into a substantially V-shape when viewed from the side, and its front end is located at the midway between the front and back of the bottom 9 of the hull 2. This opening is the water intake port 1.
It is 0. On the other hand, the rear end of the duct 8 opens at the stern 11 of the hull 2, and this opening is connected to the water spout 1.
2.

Reference numeral 14 denotes an engine, and a propulsion shaft 15 extends rearward from the engine 14, and the rear end of this propulsion shaft 15 is located on the axis of the duct 8 in the front and back midway, and is connected to the propulsion shaft 15. A propulsion propeller 16 is attached to the rear end of 15. Then, if the engine 14 is activated,
A propulsion propeller 16 is driven via the propulsion shaft 15, thereby sucking water into the duct 8 through the water intake port 10 (arrow A in FIGS. 1 and 2), while this water flows through the water spout The water jet propulsion boat 1 is propelled by being ejected from the water jet 12 toward the rear of the hull 2 (arrow B in FIGS. 1 and 2). 1 to 3, the reference numeral 18 is a propelled ship, and this propelled ship 18 is made of FRP.
The hull 19 has a bow section 20, left and right side sections 21, 21 that integrally extend rearward from the bow section 20, and a lower end of each of the left and right side sections 21, 21. The left and right side parts 21,
A space surrounded by the reinforcing plate 21 and the reinforcing plate 22 serves as a fitting recess 23.

The fitting recess 23 is open upward and rearward, and has a shape in which the bow portion 24 of the hull 2 is removably inserted when the water jet propulsion boat 1 is moved forward. It has become. Further, a holding means 26 is provided for holding the water jet propulsion boat 1 fitted into the fitting recess 23 in the fitted state while pressing it forward. This holding means 26 has a pair of left and right bands 27, 27 made of rubber or the like. One end of each of these bands 27 is attached to the reinforcing plate 2.
2, and the other ends are releasably connected to each other by a buckle 28 on the seat 5. When the water jet propulsion boat 1 is propelled in the above-mentioned fitted state, the propelled boat 18 is pushed and moves forward. In other words, the water jet propulsion boat 1 functions as a driving source for the propelled boat 18, and ship 1
8 will be moved to the desired position.

1 to 4, a rectangular notch 30 is formed in the rear part of the reinforcing plate 22, which is the bottom plate of the fitting recess 23, and as shown in FIGS. 1 to 3, a water jet propulsion When the boat 1 is fitted into the fitting recess 23, the rear end edge 31 of the reinforcing plate 22 corresponding to the water intake port 10, that is, the edge of the notch 30, is placed forward of the water intake port 10 by a length. They are separated by l. Therefore, when the propelled boat 18 is moved by the water jet propulsion boat 1, even if a large number of vortices 33 are generated one after another in the water 32 from the rear end edge 31 of the reinforcing plate 22, these vortices 33 is the above water intake port 1
By the time it reaches 0, it has diffused or weakened and disappeared, thus preventing these vortices 33 from entering the duct 8 through the water intake 10. Therefore, the inconvenience of degrading the performance of the propulsion propeller 16 provided in the duct 8 is prevented from occurring. In the above case, if the thickness of the reinforcing plate 22 is d (approximately 1 cm), the dimension l is preferably about d×(25 to 50).

The front part of the fitting recess 23 is formed by an upper plate 35, and this upper plate 35 has a shape that follows the bottom of the bow part 24 of the water jet propulsion boat 1, that is, it has an arcuate concave shape. There is. Further, the upper end of the upper plate 35 is connected to the upper surface plate of the bow section 20 of the propelled ship 18 by rivets, and the left and right side parts of the upper plate 35 are connected to the respective side parts 21 of the propelled ship 18.
, 21 on the fitting recess 23 side. The upper plate 35 is formed with a locking recess 38 into which the bow 37 of the bow portion 24 is inserted so as to position the bow 37 vertically and horizontally. In addition, the upper plate 35
The rear edge of the reinforcing plate 22 is firmly bonded to the front upper surface of the reinforcing plate 22 with an adhesive.

In the above case, the bottom 36 of each part of the propelled vessel 18 including the bow 20 and the lower surface of the reinforcing plate 22 are smooth in the longitudinal direction (front-back direction) and the left-right direction of the hull 19 of the propelled vessel 18. It is formed to be continuous. In this way, when the propelled boat 18 is propelled by the water jet propulsion boat 1, generation of the vortex 33 in the water 32 behind the bottom 36 of the bow section 20 is prevented. In addition, in the propelled ship 18, the side portion 21, the reinforcing plate 22,
Fitting recess 23, bow section 24, upper plate 35, and bottom 36
The configuration is the same as that shown in FIG. 7 in the second embodiment described later.

In FIG. 3, a protrusion 39 that slightly protrudes downward is formed at the left and right intermediate portions of the rear part of the bottom 9 of the water jet propulsion boat 1.
I'm stuck in it. In this case, the rear edge 31 of the reinforcing plate 22 and the lower surface of the protrusion 39 rearward of the rear edge 31 are smoothly continuous in the longitudinal direction (front-back direction) and width direction of the hulls 2, 19. It is formed like this. That is, when the water jet propulsion boat 1 moves the propelled vessel 18, consideration is given to suppressing the generation of a vortex 33 behind the rear end edge 31 and preventing an increase in propulsion resistance.

In particular, the water intake 10 of the water jet propulsion boat 1
Since the surrounding hull bottom 9 and the rear edge 31 of the reinforcing plate 22 are smoothly continuous in the longitudinal direction of the hull 2, water is smoothly taken in from the water intake port 10 and the water jet propulsion boat 1 is propelled. It can be done smoothly. Further, when the bow part 24 of the water jet propulsion boat 1 is fitted into the fitting recess 23, the bow part 24 is automatically fitted into the front part of the fitting recess 23, and the protruding part 39 is cut out. 30 and propelled ship 1
The water jet propulsion boat 1 is positioned relative to the water jet propulsion boat 8.

In FIGS. 1 to 4, the propelled ship 18
A recess 41 extending from side to side is formed in the upper surface of the bow section 20 of the boat, and three seats 42 are arranged side by side in this recess 41 from side to side. Further, a recess 43 extending back and forth is formed on the upper surface of each side portion 21, and a pair of seats 44 facing each other in the front and back are provided in this recess 43. A crew member 45 on this seat 44 can operate the water jet propulsion boat 1. Additionally, 46 is a handrail.

Each of the following figures shows other embodiments, but since these embodiments have the same configuration and function as the first embodiment, the common configurations are indicated by reference numerals in the drawings. The explanation will be omitted and only the different configurations and functions will be explained. (Second Embodiment) FIGS. 5 to 10 show a second embodiment. According to this, the bar handle 4 of the water jet propulsion boat 1 is supported by the rotating end of the rotating arm 48 that is pivotally supported on the handle support part 3 so as to be vertically movable, and the seat 5 is provided. At this position, a footrest surface 6 is formed in place of this seat 5. A crew member standing on this footrest surface 6 can operate the water jet propulsion boat 1 while gripping the bar handle 4 and moving the rotating arm 48 up and down.

A support piece 50 is provided protruding from the rear end of each of the side parts 21, and one end side of a ladder 51 is pivoted to the support piece 50 by a pivot shaft 52 so as to be vertically movable. Further, a ratchet device 53 is provided which automatically allows the ladder 51 to rotate upward while preventing it from rotating downward. This ratchet device 53 is composed of a gear 54 formed on the protruding end of the support piece 50, and an engaging pawl 55 that is pivotally supported by the ladder 51 and removably engages with the gear 54.

As shown in FIGS. 5 to 7, when the rudder 51 is rotated upward when not in use, the rudder 51 is attached to the stern 11 of the water jet propulsion boat 1 fitted into the fitting recess 23. One end portion 57 of 51 is pressed into contact. The one end portion 57 maintains the fitted state while pressing the water jet propulsion boat 1 fitted into the fitting recess 23 forward. That is, the ladder 51 and the ratchet device 53 also serve as the holding means 26. When pulling out the water jet propulsion boat 1 from the fitting recess 23, the engaging pawl 55 is disengaged from the gear 54, and the rudder 51 is rotated downward as shown in FIG. What is necessary is to open the rear part of 23.

In FIG. 7, a stopper 58 is provided protruding from one end of the ladder 51, and when the ladder 51 is rotated downward by a predetermined amount, the stopper 58 moves against the support piece 50.
, and further downward rotation is prevented. In this way, for example, the crew member underwater 32 can climb onto the propelled ship 18 using the ladder 51.

5 to 9, the reinforcing plate 22 is formed with a rectangular communication port 59 that communicates the water intake port 10 with the lower part of the reinforcing plate 22. As shown in FIGS. The left-right width dimension of the communication port 59 is slightly larger than the water intake port 10, but the front edge 60 of the opening edge of the communication port 59 is spaced forward from the water intake port 10 by a distance l. There is. Therefore, even if a large number of vortices 33 are generated one after another in the water 32 from the front edge 60 of the communication port 59 toward the rear when the propelled vessel 18 is propelled by the water jet propulsion boat 1, these vortices 33 By the time they reach the water intake 10, they are diffused or weakened and disappear, thus preventing these vortices 33 from entering the duct 8 through the water intake 10. The lower surface of the protrusion 39 rearward of the front edge 60 of the communication port 59 is formed to be smoothly continuous in the longitudinal and width directions of the hulls 2, 19.

In FIG. 8, the reinforcing plate 22 has a pair of grooves 62, 6 extending in the front and back direction on the left and right sides of the communication port 59.
2 is formed. On the other hand, a protrusion 63 is formed on the bottom 9 of the water jet propulsion boat 1 to fit into the groove 62 when the bow portion 24 of the water jet propulsion boat 1 is fitted into the fitting recess 23 . That is, when the bow portion 24 of the water jet propulsion boat 1 is fitted into the fitting recess 23, the protrusion 63 is inserted into the groove 62.
The water jet propulsion boat 1 is automatically fitted into the water jet propulsion boat 18 so that the water jet propulsion boat 1 is positioned laterally with respect to the propelled boat 18.

In FIGS. 9 and 10, four handle portions 64 are formed on each of the left and right sides of the propelled vessel 18, and these are used to carry the propelled vessel 18. Also,
In this embodiment as well, as in the first embodiment, the bottom 36 of each part of the propelled vessel 18 and the lower surface of the reinforcing plate 22 are smoothly continuous in the longitudinal direction and the left-right direction of the hull 19 of the propelled vessel 18. It is formed to do so.

(Third Embodiment) FIGS. 11 and 12 show a third embodiment. According to this, the upper surface of the reinforcing plate 22 in the front cross section has a concave shape as a whole, and the bottom 9 of the water jet propulsion boat 1 fits onto this reinforcing plate 22, so that the propelled boat 18 is exposed to water. The jet propulsion boat 1 is positioned laterally and laterally. A communication port 59 is formed in the reinforcing plate 22, and the lower surface of the front edge 60 of the opening edge of the communication port 59 is inclined so as to gradually approach the bottom 9 of the water jet propulsion boat 1 as it goes rearward. ing. As a result, the lower surface of the protrusion 39 rearward of the front edge 60 of the communication port 59 is formed to be smoothly continuous with the front edge 60 of the communication port 59 .

Further, the lower surface of the rear edge 65 at the opening edge of the communication port 59 is inclined so as to gradually approach the bottom 9 of the water jet propulsion boat 1 as it moves forward. Consideration is given to reducing fluid resistance due to the edge 65. Also in this embodiment, as in the first embodiment, each part of the propelled ship 18 has a bottom 3
6 and the lower surface of the reinforcing plate 22 are formed so as to be smoothly continuous in the longitudinal direction of the hull 19 of the propelled ship 18 and in the left-right direction. The position of the rear edge 65 may be slightly forward of the rear edge of the water intake port 10 as shown by the dashed line in FIG. It may be. Further, although the above is based on the illustrated example, the fitting recess 23 may be offset to either the left or right side of the hull 19 of the propelled ship 18. Further, although the left and right side portions 21, 21 are symmetrical in each embodiment, they may be asymmetrical.

[0027]

[Effects of the Invention] According to the present invention, since the bottom of the bow of the propelled ship and the lower surface of the reinforcing plate are smoothly continuous in the longitudinal direction of the hull, the propelled ship is propelled by the propelling ship. When this occurs, the generation of vortices in the water behind the bottom of the bow is suppressed. Therefore, these vortices are prevented from interfering with the above-mentioned propulsion, that is, propulsion resistance is kept small.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view taken along the line 1-1 in FIG. 2 in a first embodiment.

FIG. 2 is a plan view of the first embodiment.

FIG. 3 is a rear view of the first embodiment.

FIG. 4 is a plan view with the water jet propulsion boat removed in the first embodiment.

5 is a partial sectional view taken along the line 5-5 in FIG. 6 in the second embodiment; FIG.

FIG. 6 is a plan view of the second embodiment.

FIG. 7 is a partially enlarged view of FIG. 5 in a second embodiment.

FIG. 8 is a sectional view taken along the line 8-8 in FIG. 7 in the second embodiment.

FIG. 9 is a plan view with the water jet propulsion boat removed in the second embodiment.

10 is a sectional view taken along the line 10-10 in FIG. 9 in the second embodiment; FIG.

FIG. 11 is a side partial sectional view of the third embodiment.

FIG. 12 is a sectional view taken along the line 12-12 in FIG. 11 in the third embodiment.

[Explanation of symbols]

1 Water jet propulsion boat (propulsion boat) 9 Bottom 18 Propelled ship 19 Hull 20 Fore part 21 Side part 22 Reinforcement plate (bottom plate) 23 Fitting recess 24 Fore part 31 Trailing edge (trailing edge) 36 Bottom of ship 59 Communication port 60 Front edge (rear edge)

Claims (1)

[Claims] [Claim 1] Connecting the left and right side parts extending rearward from the bow, a fitting recess formed between these left and right side parts into which the propulsion vessel is removably fitted, and the left and right side parts. A propelled ship provided with a reinforcing plate, wherein the bottom of the bow section and the lower surface of the reinforcing plate are smoothly continuous in the longitudinal direction of the hull.