JPH0986480A - Stern part structure of water jet propulsion boat made of frp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a part, having a high curvature, to the mounting part of a stern base plate, through simple structure. SOLUTION: In a water jet propulsion boat made of FRP wherein a water jet pusher is installed at a stern bottom, a stern base plate 15 is recessed in an up state and a space in which the jet pusher is installed is formed in a recessed part 160. The stern base plate 5 is attached to the lower end part of the recessed part 160 and a bottom is formed of a stern base plate 5. The base plates 15 on both sides of the recessed part 160 and the rise walls 16 on both sides of the recessed part are interconnected through a flat inclination plate 18. Formation is such that an angle between the inclination plate 18 and the rise wall 16 and an angle between the inclination plate 18 and the base plate 15 are set to an obtuse angle, and the flange surfaces 520 of the two side parts of the stern base plate 5 are brought into contact with the two inclination plates 18 to fix the stern base plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stern structure of an FRP water jet propulsion boat.

[0002]

2. Description of the Related Art Conventionally, a water jet propulsion boat having a water jet propulsion machine at the stern bottom has been used as a small FRP vessel. In this hull, the stern bottom plate is recessed upwards, a water jet propulsion machine is installed in this recess, and the bottom plate of the stern is attached to the lower end of this recess to form the bottom of the ship. Has been done. That is, as shown in FIGS. 6 and 7, the connecting portions 19 between the rising walls 16 on both sides of the recess 160 and the bottom plates 15 on both sides thereof.
Is curved with a large curvature (small radius of curvature R), a nut member 501 is fixed to the inside of the lower portion of the rising wall 16 by a mounting bolt 503, and both side flange surfaces 502 of the stern bottom plate 500 are attached to the lower surface of the nut member 501. The stern bottom plate 500 is attached to the lower part of the recess 160 and is fixed by the mounting bolt 504. The stern bottom plate 50 adopts such a configuration.
Since the lower surface 510 of 0 is the lowest part of the hull and this is the reference position of the height of the hull, the inner surface of the rising wall 16 is a vertical surface in order to accurately set this position, and the nut member 501 is provided here. Is attached to position the stern bottom plate 500, and the vertical mounting surface is used as the recess 16
Since it is formed at the lower end portion of 0, the connection portion 19 having a large curvature is generated. In order to mold the hull, the deck member and the hull member are each integrally molded by molding, and the recessed portion is also integrally molded when molding the hull member. In this molding, the SMC method is used in terms of workability. Has been adopted.

[0003]

With the above-mentioned structure, when molding the recess 160 for the water jet propulsion machine,
The connecting portions 19 between the bottom plate 15 on both sides of the recessed portion 160 and the rising walls 16 on both sides of the recessed portion 160 are curved at a steep angle, and it is difficult to form this portion well. That is, in SMC molding, an SMC material obtained by impregnating a reinforcing fiber such as glass fiber with a mixture of an unsaturated polyester resin, a curing agent, a thickener, etc. is press-molded into a predetermined shape in advance. There is a problem that the fiber needs to be molded so as not to be broken due to a large bending action, and it takes time to mold. Further, even when the molding is performed by a method other than the SMC method, there is a similar problem in a bent portion having a large curvature, and it takes a long time for molding.

The present invention has been made in order to solve the conventional problems as described above, and has a simple structure so that a large curvature portion does not occur in the mounting portion of the stern bottom plate, and the productivity is improved. The present invention provides a stern structure of an FRP water jet propulsion boat.

[0005]

According to the first aspect of the present invention, there is provided a method for producing an FR.
In an FRP water jet propulsion boat in which a water jet propulsion unit is installed at the bottom of the stern formed by P, the stern bottom plate is recessed upward, and a space for installing the water jet propulsion unit is formed in this recess. The stern bottom plate is attached to the lower end of the recess, and the stern bottom plate forms the bottom of the ship, and the bottom plates on both sides of the recess and the rising walls on both sides of the recess are flat inclined plates. This sloping plate is formed so as to be inclined in the ship width direction such that the angle formed by the rising wall and the angle formed by the ship bottom plate are obtuse angles. The stern bottom plate is fixed by abutting the flange surfaces on both sides of the stern.

In this structure, an inclined plate serving as a mounting portion for the stern bottom plate is formed at a connecting portion between the rising wall of the recessed portion and the ship bottom plates on both sides thereof, and an angle formed between the inclined plate and the rising wall and the ship bottom plate. Since it has an obtuse angle, it is possible to prevent the occurrence of a portion with a large curvature, which eliminates the drawback that the reinforcing fiber breaks and weakens the strength. Furthermore, the structure is simple and the mounting strength is excellent. .

According to a second aspect of the present invention, the stern bottom of the stern is formed with horizontal flange surfaces on both sides thereof at the same height, and between the flange surface and the inclined plate, an auxiliary member is in surface contact with both surfaces. Is intervening.

In this structure, since the mounting surface of the stern bottom plate is formed by the auxiliary member on a horizontal plane having the same height, the height of the mounting surface is increased even though the surface of the hull side on which the stern bottom plate is mounted is inclined. The stern bottom plate can be accurately attached to a predetermined height.

[0009]

2 to 4, in a watercraft 1 of a water jet propulsion boat, a deck member 11 and a hull member 12 which are integrally formed by FRP molding are joined together at their peripheral portions 13. The operation handle 20 is formed near the center on the center line of the hull, and the seat 2 is formed on the rear side of the hull so as to extend in the stern direction, and the foot decks 30 are formed on both sides of the seat 2 to the stern end. It is formed to extend. A water jet propulsion device 4 is installed on the bottom of the stern of the hull 1, a bottom plate 41 having a water inlet 40 is attached to the lower half of the water jet propulsion device 4, and a stern bottom plate 5 to be described later is attached to the latter half. Installed.

The installation portion of the water jet propulsion device 4 is constructed as shown in FIG. That is, the stern bottom plate 15
Has a recess 160 formed by a rising wall 16 on both sides and an upper wall 17 connecting both ends of the rising wall 16 which is recessed upward at the center in the ship width direction. A space in which the water jet propulsion machine 4 is installed is formed in the recess 160, and a stern bottom plate 5 made of an aluminum alloy is attached to the lower end of the recess 160 to form a ship bottom. The bottom plate 15 on both sides of the recessed portion 160 and the rising wall 16 of the recessed portion are continuous via a flat inclined plate 18, and a reinforcing rib 183 is attached between the inclined plate 18 and the rising wall 16 and the bolt is attached. A hole 180 is formed. The angle formed between the inclined plate 18 and the rising wall 16 and the angle formed between the inclined plate 18 and the ship bottom plate 15 are obtuse angles.
On the other hand, the stern bottom plate 5 is fixed by abutting the flange surfaces on both sides of the stern bottom plate 5. That is, the stern bottom plate 5
Comprises a flat portion 51 and flanges 52 provided on both sides thereof. The flange 52 has a bolt hole 521 having a triangular cross section, and its upper flange surface 520 is in surface contact with the lower surface of the inclined plate 18. It is formed to be inclined.

The flange surface 520 is used as the inclined plate 18
Align the mounting bolt 181 with the bolt hole 52
The stern bottom plate 5 is fixed by penetrating 1,180 and tightening with a nut 182. As described above, in this configuration, the lower surface of the inclined plate 18 is used as a reference surface for mounting the stern bottom plate 5, and both inclined plates 1 based on the error in the width direction of the hull are used.
It is preferable to set the bolt hole 521 of the stern bottom plate 5 to a size with a margin with respect to the bolt 181 in order to absorb the dimensional error between the eight.

FIG. 5 shows another embodiment of the mounting portion of the stern bottom plate, in which the rising walls 16 and the bottom plate 1 on both sides of the recess 160 are formed.
5 is the same as the structure in FIG. 1 in that the inclined plate 18 is formed at the connecting portion with the stern 5, but the structure of the flange portion of the stern bottom plate 5 is different. That is, the flanges 53 on both sides of the stern bottom plate 5 have their upper flange surfaces 530 forming horizontal surfaces having the same height, and a rubber auxiliary member 54 having a triangular cross section is provided as a separate member to be fitted to the flange surfaces 530. Has been. The upper surface 540 of the auxiliary member 54 is configured to be fitted to the lower surface of the inclined plate 18, and is formed to have the same shape as the flange 52 of FIG. 1 by combining the flange 53 and the auxiliary member 54. .

In the structure shown in FIGS. 1 and 5, the inclined plates 18 are formed at both corners of the recess 160, and the bottom plate 15 and the rising wall 16 are continuous with each other through the inclined plates 18. Therefore, the large curvature portion such as the corner portion 19 shown in FIG. 7 in the conventional structure is prevented from occurring. That is, since the angle formed by the inclined plate 18 and the rising wall 16 and the angle formed by the inclined plate 18 and the ship bottom plate 15 are formed as obtuse angles, the corners between them are bent portions with a small curvature. . Therefore, even when the molding is carried out by the SMC method, there is no possibility that the reinforcing fibers of the FRP are broken at the corners, whereby the molding time can be shortened and the productivity can be improved.

Further, in the structure of FIG. 1, the stern bottom plate 5 has the flange surfaces 520 on both sides thereof as the inclined plate 1 which is a part of the hull member.
8 is directly coupled to the lower surface of No. 8 and is different from the configuration in which the nut member 501 is indirectly attached through the nut member 501 (see FIG. 7) as in the conventional example. Therefore, the configuration is simple and the attachment strength is excellent. Moreover, there is an advantage that it is easy to accurately set the mounting position of the stern bottom plate 5.

In the structure shown in FIG. 5, the inclined plate 18 is first provided.
The upper surface 540 of the auxiliary member 54 is aligned with the lower surface of the mounting member 542, and the mounting bolt 542 is passed through the bolt hole 180.
The lower surface of the auxiliary member 54 forms a horizontal plane for mounting the stern bottom plate 5. Then, the stern bottom plate 5 is fixed by aligning the flange surface 530 of the stern bottom plate 5 with the lower surface of the auxiliary member 54 formed of the horizontal surface and tightening the mounting bolt 532 to the auxiliary member 54 through the bolt hole 531. The bolt hole 531 is formed to have a sufficient size with respect to the bolt 532 so that the mounting position of the stern bottom plate 5 can be adjusted during this tightening. In this case, a dimensional error occurs between the inclined plates 18 on both sides, and when attaching the stern bottom plate 5 to the inclined plate 18 side, it is necessary to finely adjust the attachment position while moving the stern bottom plate 5 in the width direction of the hull. However, since the stern bottom plate 5 is mounted on a horizontal plane, it does not affect the height of the bottom surface of the stern bottom plate 5 which is the reference plane of the hull height, and has an advantage that it can be mounted at a predetermined height accurately. is there. Further, in this configuration, since the mounting surface of the stern bottom plate is formed on the horizontal plane of the same height by the auxiliary member 54, the height of the mounting surface is increased even though the surface on the hull side where the stern bottom plate is mounted is inclined. The stern bottom plate can be accurately attached to a predetermined height.

Although only the stern bottom plate 5 has been described in the above embodiment, the present invention is also applicable to the bottom plate 41 on the front side thereof.

[0017]

According to the first aspect of the present invention, inclined plates serving as mounting portions for the stern bottom plate are formed at the connecting portions of the rising walls on both sides of the recessed portion and the ship bottom plates on both sides thereof, and the rising plates and the rising sides are formed. Since the angle between the wall and the ship bottom plate is obtuse, a large curvature is prevented from occurring, which eliminates the disadvantage that the reinforcing fibers are easily broken during molding, and the time required for molding Can be shortened to improve productivity.

According to the second aspect of the present invention, in addition to the above-described effects, since the mounting surface of the stern bottom plate is formed by the auxiliary member on a horizontal plane having the same height, the surface on the hull side where the stern bottom plate is mounted is inclined. Nevertheless, the height of the mounting surface can be made accurate, and the stern bottom plate can be accurately mounted at a predetermined height.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a stern bottom of an embodiment of the present invention.

FIG. 2 is a bottom view of the rear portion of the hull of FIG.

FIG. 3 is a side view of the entire hull of FIG.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a view corresponding to FIG. 1, showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a structure of a conventional stern bottom part.

FIG. 7 is an enlarged explanatory view of the stern bottom plate attachment portion of FIG.

[Explanation of symbols]

 1 hull 4 water jet propulsion machine 5 stern bottom plate 6 inspection port 15 stern bottom plate 16 rising wall of recessed part 18 inclined plate 51 flat part of stern bottom plate 52 flange of stern bottom plate 54 auxiliary member 160 recessed part 520, 530 Flange surface of stern bottom plate 540 Flange surface of auxiliary member

Claims (2)

[Claims] 1. An FRP water jet propulsion boat in which a water jet propulsion unit is installed on the stern bottom formed of FRP. In the FRP water jet propulsion boat, the stern bottom plate is recessed upward and the water jet propulsion unit is installed in this recess. Is formed, and the stern bottom plate is attached to the lower end of the recessed portion, and the stern bottom plate forms the ship bottom surface, and the bottom plate on both sides of the recessed portion and the rising walls on both sides of the recessed portion are Continuing through a flat sloping plate, this sloping plate is formed by inclining in the ship width direction so that the angle formed by the rising wall and the angle formed by the ship bottom plate are obtuse angles. On the other hand, the stern structure of the FRP water jet propulsion boat is characterized in that the stern bottom plate is fixed by abutting the flange surfaces on both sides of the stern bottom plate. 2. The stern bottom of the stern has flange surfaces on both sides thereof formed in a horizontal plane having the same height, and an auxiliary member is provided between the flange surface and the inclined plate so as to make surface contact with both surfaces. The stern structure of the FRP water jet propulsion watercraft according to claim 1, wherein