JP2011088524A - Water jet propulsion watercraft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact water jet propulsion watercraft with a dry area and a water-access area. <P>SOLUTION: The water jet propulsion watercraft 1 includes: a hull 2; a cockpit 3 arranged at the center of the hull, and all the periphery of which is surrounded by a wall surface; a rear deck 4 with a rear water-access area 40; and a front deck 5 with a front water-access area 50. The cockpit 3 is provided with a saddle riding type tandem seat 12. A jet propulsion device and an engine providing the jet propulsion device with a driving force are contained in the hull 2. The tandem seat 12 is constructed by connecting between a vessel steering seat 13 and a first passenger seat 21 in the fore-and-aft direction. A second and a third passenger seat 22, 23 are provided on the left and the right of the first passenger seat 21. A fourth passenger seat 24 is disposed on the rear deck 4, adjacent to the first passenger seat 21. A removable fifth passenger seat 25 can be installed on the front deck 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water jet propulsion boat that applies a propulsive force to a hull by a jet propulsion device.

  A water jet propulsion boat according to one prior art is disclosed in Patent Document 1 below. This water jet propulsion boat belongs to a category called personal watercraft (PWC). That is, this water jet propulsion boat includes a tandem seat on which a passenger sits and a steering handle disposed in front of the tandem seat. A flat portion is provided on the stern side of the hull so that it is easy to get on and off from the stern side. There is a drainage channel between the foot place under the passenger and the flat part. This prevents seawater from accumulating under the feet and improves drainage efficiency during cleaning.

JP 7-277274 A

Personal watercraft is designed on the premise that the occupant gets wet. That is, it is assumed that water enters the occupant's foot place from a flat portion provided for getting in and out of the water. Therefore, if the user does not want to get wet with water, personal watercraft is not suitable for that application.
Another category of water jet propulsion boats are jet boats (sometimes called pleasure boats or sports boats). The jet boat has a well surrounded by a wall on the entire circumference, and a boat maneuvering seat and a passenger seat are provided in the well. The maneuvering seat is a seat that can be seated in a closed state. The inside of the well is a dry area where the surrounding water does not enter. Thus, jet boats are an appropriate option for users who do not want to get wet. On the other hand, access to the water around the hull is not as easy as personal watercraft, so it is not necessarily suitable for applications that assume underwater and hull boarding / exiting. In addition, since jet boats are generally large, they cannot be easily used, and mooring requires a large space, which increases the maintenance cost.

  For example, if some of the occupants want to get on and off between the hull and the water and others dislike getting wet, the jet boat will be chosen. However, since jet boats are generally designed on the assumption that a relatively large number of passengers are transported, they cannot be used as easily as personal watercraft. Therefore, neither personal watercraft nor jet boat is suitable for the use when the desires of a small number of passengers are divided. Therefore, in such a case, the water jet propulsion boat cannot provide an appropriate option.

  In order to solve the above-described problems, an embodiment of the present invention is arranged in a hull, a cockpit arranged in the center of the hull and surrounded by a wall surface, and a hull rear part behind the cockpit. A rear deck having a rear hydrophilic area opened rearward, a saddle-type maneuvering seat provided in the cockpit, and attached to the hull and propelled to the hull by sucking and injecting surrounding water A water jet propulsion boat including a jet propulsion device that applies force and an engine that is attached to the hull and that provides driving force to the jet propulsion device is provided.

  According to this configuration, the cockpit provides a dry area where the water around the hull does not easily enter because the entire circumference is surrounded by the wall surface. On the other hand, the rear deck arranged in the rear part of the hull has a water-access area that is open to the rear, so that it is easy to get down and get into the water. The cockpit disposed in the center of the hull is provided with a saddle-type maneuvering seat, and thus the hull can be configured compactly. In this manner, a new category can be provided for water jet propulsion boats that obtain propulsive force from a jet propulsion device driven by an engine (which may be an internal combustion engine). That is, a dry area and a hydrophilic area can coexist in a compact hull, and therefore, a water jet propulsion boat that can be easily used and can meet various needs of passengers can be provided.

Preferably, the rear deck includes a floor surface inclined to descend toward the rear. According to this configuration, even if the rear deck is waved, it can be easily drained from the rear hydrophilic region according to the floor surface inclined rearward.
Preferably, the saddle-ride type maneuvering seat extends in the front-rear direction of the hull and divides the inside of the cockpit into two left and right regions (Claim 2). According to this configuration, the saddle-ride type maneuvering seat can be arranged in the center with respect to the horizontal direction of the hull. Thereby, even a small hull can be easily balanced. In addition, since two areas are secured on the left and right sides of the saddle-type maneuvering seat, it is possible to provide a passenger's living space on both the left and right sides of the hull. The left and right living spaces can be used for fishing, for example. That is, fishing and other activities can be performed on both the right and left sides of the hull.

The saddle riding type maneuvering seat does not have to have a structure in which the cockpit is completely partitioned from side to side.
Preferably, the water jet propulsion boat further includes a first passenger seat provided in the cockpit behind the saddle riding type maneuvering seat, and the engine is disposed below the first passenger seat. (Claim 3). According to this configuration, the first passenger seat is provided behind the saddle-ride type maneuvering seat, and the engine is arranged using the space below the first passenger seat, so that the hull can be shortened. In particular, the first passenger seat is preferably a saddle-ride type seat connected to the rear of the saddle-ride-type maneuvering seat, so that a space for arranging the engine can be easily secured.

The first passenger seat may be designed so that one passenger can be seated, or can be designed so that two or more passengers can be seated. Further, the saddle-ride type maneuvering seat and the first passenger seat may be continuously formed in the front-rear direction to form a tandem seat. And the inside of a cockpit may be divided into the area | region on either side with such a tandem seat.
Preferably, the water jet propulsion boat has a second passenger seat provided in the cockpit on the right side of the first passenger seat, and a second passenger seat provided in the cockpit on the left side of the first passenger seat. 3 passenger seats (claim 4). According to this configuration, since the second and third passenger seats are arranged on the left and right of the first passenger seat, the center of gravity of the entire hull including the occupant can be arranged in the vicinity of the engine. Accordingly, the center of gravity can be disposed rearward while the engine is disposed in the space below the first passenger seat to shorten the hull length. As a result, it is possible to contribute to the establishment of the hull motion performance (particularly turning performance). That is, when the engine is arranged in front of the jet propulsion device, if the hull length is shortened, it becomes difficult to arrange the center of gravity rearward. Therefore, the center of gravity can be concentrated by arranging the engine using the lower space of the first passenger seat and further arranging the second and third passenger seats on the left and right sides thereof. As a result, it is possible to achieve both a shortening of the hull length and a rearward arrangement of the center of gravity, which are in a contradictory relationship.

  Preferably, the water jet propulsion boat further includes a fourth passenger seat provided on the rear deck. According to this configuration, since the fourth passenger seat is provided on the rear deck, fishing and other activities can be performed on the rear of the hull. Since the rear deck has a hydrophilic area opened to the rear, it is preferably used mainly when anchoring or moving at a low speed (for example, during trolling).

The fourth passenger seat is preferably arranged so as to be adjacent to the first passenger seat behind the first passenger seat. As a result, the weight can be concentrated in the vicinity of the engine, which can further contribute to the establishment of the motion performance of the hull.
The fourth passenger seat preferably has a seat facing the rear of the hull. Thereby, the passenger | crew who seated on the 4th passenger seat can present a fishing rod toward back, for example.

It is preferable that the rear deck is provided with a footrest configured to allow an occupant seated in the fourth passenger seat to place his / her foot. The footrest is preferably formed so as to rise from the hull rear edge, for example. The passenger in the fourth passenger seat can maintain the posture by placing his / her foot on the footrest.
Preferably, the cockpit is partitioned by left and right side walls, and storage spaces are provided in the left and right side walls, thereby narrowing the left and right spaces of the saddle riding type maneuvering seat. 6). According to this configuration, the left and right spaces of the saddle riding type maneuvering seat are narrowed down by providing the storage spaces on the left and right side walls. Thereby, since a passenger | crew's movement range can be restrict | limited appropriately, stabilization of a hull can be aimed at. At the same time, a storage space can be secured.

  Preferably, the water jet propulsion boat further includes a front deck that is disposed at a front portion of the hull in front of the cockpit and has a front hydrophilic area that is open forward. According to this configuration, the front deck of the front part of the hull is provided with a front hydrophilic area that is open forward, so that the water can be accessed from the front part of the hull to the front part of the hull. You can board. Accordingly, an activity space for fishing and other activities can be provided on the front side of the hull.

  Preferably, the water jet propulsion boat further includes a fifth passenger seat disposed on the front deck. According to this configuration, since the fifth passenger seat is provided on the front deck, fishing and other activities are easily performed on the front side of the hull. Since the front deck has a front hydrophilic area opened forward, it is preferably used mainly when anchoring or moving at a low speed (for example, during trolling). The fifth passenger seat is preferably arranged, for example, so that the hull centerline passes in plan view. Thereby, the fifth passenger seat can be arranged without impairing the balance of the hull.

  Preferably, the water jet propulsion boat further includes a seat mounting portion arranged on the front deck and configured to be able to attach and detach the fifth passenger seat (claim 9). According to this configuration, the fifth passenger seat can be attached when necessary, and the fifth passenger seat can be removed when unnecessary. For example, when the water jet propulsion boat is sailing at high speed, it is preferable to remove the fifth passenger seat to reduce the air resistance and to ensure a wide view of the operator. In addition, when fishing or other activities are performed, or during low-speed navigation (for example, during trolling), it is preferable to attach the fifth passenger seat to the seat mounting portion to facilitate activities on the front deck.

  Preferably, the water jet propulsion boat further includes a storage portion that is disposed on the front deck and configured to receive a fifth passenger seat that can be attached to the seat attachment portion. According to this configuration, the detachable fifth passenger seat can be stored in the storage portion of the front deck. This facilitates the transportation of the fifth passenger seat. In particular, when navigating the hull at high speed, it is preferable to store the fifth passenger seat in the storage section to ensure a wide field of view for the operator and to reduce air resistance. The seat attachment portion may be provided on the lid of the storage portion.

  Preferably, the water jet propulsion boat is formed in a shape that rises from a hull edge of the front deck, and further includes a footrest for a user seated on the fifth passenger seat (claim 11). According to this configuration, since the footrest is formed by raising the hull edge of the front deck, the occupant seated in the fifth passenger seat can maintain its posture by placing the foot on the footrest. Can do.

Preferably, the front deck includes a floor surface inclined so as to descend toward the front. According to this configuration, even if the front deck is waved, it can be easily drained from the front hydrophilic area according to the floor surface inclined forward.
Preferably, the water jet propulsion boat further includes an arched traction tower standing from the left and right edges of the hull near the boundary between the cockpit and the rear deck. According to this configuration, towing can be performed using the tow tower. Specifically, a rope for towing a water skier or the like can be coupled to the towing tower. Since the traction tower has an arch shape, it can be arranged without impairing the comfort of the cockpit or the like. Further, since the traction tower is arranged near the boundary between the cockpit and the rear deck, it contributes to the rear arrangement of the center of gravity of the hull. Thereby, it can contribute to establishment of the motion performance of a hull.

1 is a perspective view of a water jet propulsion boat according to an embodiment of the present invention. It is a top view of the water jet propulsion boat. It is a front view of the water jet propulsion boat. It is a left view of the water jet propulsion boat. It is a rear view of the water jet propulsion boat. It is a perspective view which expands and shows the structure of a front deck, and shows the state which removed the 5th passenger seat. It is a perspective view which expands and shows the structure of a front deck, and shows the state which attached the 5th passenger seat. It is a perspective view which expands and shows the structure of a front deck, and shows the state which accommodated the 5th passenger seat. It is an illustration side view which shows the structure in the boat body of the said water jet propulsion boat. It is an illustration top view showing composition in a boat body. It is an illustration sectional view for explaining the example of composition of a jet propulsion machine.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a water jet propulsion boat according to an embodiment of the present invention. The water jet propulsion boat 1 includes a hull 2, a cockpit 3 disposed in the center of the hull, a rear deck 4 disposed behind the cockpit 3, a front deck 5 disposed in front of the cockpit 3, an arch A traction tower 6 in the form of a shape.

The hull 2 is configured by joining a hull body 2 a and a deck portion 2 b with a gunnel 7. A cockpit 3 is arranged in the central region of the deck portion 2b. The rear deck 4 is disposed in the rear region of the deck portion 2b. The front deck 5 is disposed in the front area of the deck portion 2b. A traction tower 6 is disposed between the cockpit 3 and the rear deck 4.
2 is a plan view of the water jet propulsion boat 1, FIG. 3 is a front view thereof, FIG. 4 is a left side view thereof, and FIG. 5 is a rear view thereof.

  The cockpit 3 forms a well 11 whose entire circumference is surrounded by a wall surface 10. A tandem seat 12 extending in the front-rear direction is disposed at the center of the cockpit 3. The tandem seat 12 is a saddle-ride type seat in which an occupant sits straddling. The tandem seat 12 has a form in which a boat maneuvering seat 13 (saddle-ride type maneuvering seat) arranged at the front and a first passenger seat 21 arranged at the rear are connected in the front-rear direction. Accordingly, the boat maneuvering seat 13 and the first passenger seat 21 are both saddle-ride type seats. The first passenger seat 21 preferably has a length that allows two passengers to be seated side by side.

  The tandem seat 12 is disposed along the center line C of the hull 2 in a plan view, and the rear end portion thereof is coupled to a rear partition wall 15 that partitions the cockpit 3 and the rear deck 4. The rear partition wall 15 rises upward from the rear end portion of the tandem seat 12 and is configured to hold the occupant's waist of the first passenger seat 21. The rear partition wall 15 extends from the rear end of the tandem seat 12 to the left and right, and further curves forward, and is coupled to the left and right side walls 16L and 16R of the deck portion 2b. The rear partition wall 15 is formed higher than the side walls 16L and 16R.

  In front of the tandem seat 12, a steering handle 30 that is operated by a boat operator seated on the boat operator's seat 13 is disposed. The steering handle 30 is a bar handle, and has a left grip 31L and a right grip 31R that are gripped by the left and right hands of the operator. An instrument case 32 is disposed between the grips 31L and 31R. The steering handle 30 is provided so as to be able to turn left and right around a turning axis passing through the vicinity of the instrument case 32.

  The handle holding portion 33 that holds the steering handle 30 is formed one step higher than the tandem seat 12. A pair of front partition walls 18 </ b> L and 18 </ b> R extending left and right are provided on the left and right sides of the handle holding portion 33. The outer edges of these front partition walls 18L and 18R are coupled to the side walls 16L and 16R, respectively. The front partition walls 18L and 18R are formed higher than the side walls 16L and 16R, and have a curved shape that is convex forward in plan view.

  The inside of the cockpit 3 is divided into a left region 3L and a right region 3R by a tandem seat 12. The left region 3L is partitioned by the tandem seat 12, the rear partition wall 15, the left side wall 16L, and the left front partition wall 18L, and forms a left well 11L that is surrounded by these wall surfaces. The right region 3R is partitioned by the tandem seat 12, the rear partition wall 15, the right side wall 16R, and the right front partition wall 18R, and forms a right well 11R that is surrounded by these wall surfaces. A second passenger seat 22 is disposed on the left side of the first passenger seat 21 at the rear of the left well 11L. Similarly, a third passenger seat 23 is disposed on the right side of the first passenger seat 21 at the rear of the right well 11R. The second and third passenger seats 22 and 23 are configured so that each passenger can be seated with the rear partition wall 15 as the back. The second and third passenger seats 22 and 23 are configured so as to be seated in a closed state in the left and right wells 11L and 11R. The seat surfaces 22a and 23b of the second and third passenger seats 22 and 23 are lower than the seat surface 21a of the first passenger seat 21 and higher than the floor surface 11a of the wells 11L and 11R.

  On the side of the cockpit 3, the side walls 16 </ b> L and 16 </ b> R are configured such that the lateral width gradually increases from the second and third passenger seats 22 and 23 toward the front. As a result, the inner walls 17L and 17R of the side walls 16L and 16R protrude toward the inside of the left and right wells 11L and 11R (in the direction approaching the tandem seat 12) as they go forward. As a result, the lateral width of the left and right wells 11L and 11R is reduced. As a result, the side walls 16 </ b> L and 16 </ b> R have wide portions at positions corresponding to the sides of the boat operator seat 13. In the wide portion, left and right storage portions 19L and 19R are provided inside the side walls 16L and 16R. The storage portions 19L and 19R are provided with opening and closing lids 20L and 20R, respectively.

An anti-slip sheet 37 (shown with cross-hatching) may be disposed on the floor 11a of the wells 11L and 11R as necessary.
The rear deck 4 is disposed behind the rear partition wall 15, and includes a rear hydrophilic area 40 that is open to the water surface behind the hull 2 and a fourth passenger seat 24. The rear hydrophilic region 40 has a U-shaped floor surface 40a that opens to the front of the hull 2 in plan view. The floor surface 40a is inclined so as to descend toward the rear of the hull 2, and a rear access gate 41 to the rear water surface is disposed at the rear tail center. Specifically, the left and right side walls 16 </ b> L and 16 </ b> R have a height that decreases toward the rear in the rear deck 4, and are interrupted at the rear edges facing each other across the rear access gate 41. Thereby, it is possible to access the water surface behind the hull 2 from the rear access gate 41 and to get into the hull 2 through the rear access gate 41 from underwater.

  The fourth passenger seat 24 is a seat that can be seated with the rear partition wall 15 as the back. The fourth passenger seat 24 is located at the front center of the rear hydrophilic region 40 and is aligned with the tandem seat 12 along the hull centerline C. Accordingly, the fourth passenger seat 24 is adjacent to the first passenger seat 21 in the front-rear direction across the rear partition wall 15. The seat surface 24 a of the fourth passenger seat 24 is higher than the floor surface 40 a of the rear deck 4 and lower than the seat surface 21 a of the first passenger seat 21, and the seats of the second and third passenger seats 22, 23. The height is about the same as the surfaces 22a and 23a. A passenger seated in the fourth passenger seat 24 can monitor the rear water area of the hull 2 and can provide a fishing rod behind the hull 2. That is, various activities can be performed behind the hull 2.

  A pair of footrests 42L and 42R are provided at the rear edges of the side walls 16L and 16R, respectively, and the rear access gate 41 is disposed between them. The left and right footrests 42L, 42R are formed by raising the stern portion of the deck portion 2b. An occupant seated in the fourth passenger seat 24 can maintain his / her posture by placing his / her feet on the left and right footrests 42L and 42R.

The seat of the fourth passenger seat 24 may be configured to be detachable. In this case, a rear storage portion may be provided below the seat portion.
For example, the occupant can move between the cockpit 3 and the rear deck 4 by straddling the rear partition wall 15 using the second or third passenger seats 22 and 23 as a stepping platform. The occupant can also move from the first passenger seat 21 to the fourth passenger seat 24 across the rear partition wall 15 or in the opposite direction.

The rear partition wall 15 has rising walls 15L and 15R on the rear deck 4 side on the left and right sides of the fourth passenger seat 24. These rising walls 15 </ b> L and 15 </ b> R rise substantially vertically from the front edge of the floor surface 40 a of the rear deck 4. Thus, even if water enters the rear deck 4, the water does not enter the cockpit 3.
A non-slip sheet 44 (shown with cross-hatching) may be disposed on the floor surface 40a of the rear hydrophilic region 40, the surface of the access gate 41, and the surfaces of the footrests 42L and 42R, if necessary.

  The traction tower 6 (not shown in FIGS. 2 and 3) is disposed in the vicinity of the boundary between the cockpit 3 and the rear deck 4. The traction tower 6 is formed in an arch shape spanned on both side walls 16L, 16R, and includes a pair of leg portions 61L, 61R and a traction plate 60. The pulling plate 60 has a rectangular plate shape that is long in the left and right in a plan view. A tow hook 62 is erected at the approximate center of the upper surface of the tow plate 60. Around the tow hook 62, the surface of the tow plate 60 is an inclined surface 63 that descends rearward. Leg portions 61L and 61R are coupled to the left and right edges of the traction plate 60, respectively.

  Each of the leg portions 61L and 61R has a ladder shape that becomes narrower as it goes upward. More specifically, each of the leg portions 61L and 61R includes a pair of frame bars 65 and a plurality of ranks 66 spanned between the frame bars 65 at equal intervals. The frame rod 65 disposed on the front side of the pair of frame rods 65 has a proximal end portion fixed to the side walls 16L and 16R on the side of the cockpit 3, and an upper end portion that is curved inward so that the traction plate 60 Connected to the front edge. The front frame bar 65 is curved so as to go rearward as it goes upward from the base end, and then forward. The frame rod 65 arranged on the rear side of the pair of frame rods 65 has a proximal end portion fixed to the side walls 16L and 16R on the side of the rear deck 4, and an upper end portion that is curved inward and pulled. The plate 60 is coupled to the rear edge portion of the edge. The rear frame rod 65 is curved so as to go forward as it goes upward from the base end. A holding cylinder 67 that is obliquely upward facing the rear is coupled to the base end of the rear frame bar 65. The holding cylinder 67 is configured so that the base end portion of the fishing rod can be inserted and held. The distance between the pair of frame bars 65 is narrowed toward the upper end side. The frame rod 65 is made of, for example, a metal material, and the case 66 is made of a metal rod welded to the frame rod 65.

The legs 61L and 61R as a whole curve forward as they go upward. Thereby, the traction plate 60 is located substantially immediately above the first passenger seat 21.
When joining a tow rope for water skiing, a wakeboard or the like, the occupant climbs one of the legs 61L and 61R and hooks the tow rope on the tow hook 62. The tow rope is in a tension state when towing a player such as a water ski, and is in an inclined state in which the tow rope descends from the tow hook 62 toward the rear. The inclined surface 63 avoids or reduces interference with the tensioned traction rope.

6A, 6B, and 6C are perspective views showing the configuration of the front deck 5 in an enlarged manner.
The front deck 5 has a planar shape that becomes narrower toward the bow, and has a front hydrophilic region 50 that is opened forward of the hull 2 at the bow. The front hydrophilic region 50 is partitioned by left and right side wall portions 56L and 56R and front partition walls 18L and 18R, and a front access gate 51 opened forward is formed at the front end. The front hydrophilic region 50 has a substantially V-shaped floor surface 50a that opens to the rear of the hull 2 in plan view. The floor 50a is inclined so as to be lowered toward the front of the hull 2, and a front access gate 51 for accessing the front water surface is disposed at the center of the bow. The left and right side wall portions 56L and 56R are formed by raising the left and right side edges of the front deck 5 to a height substantially equal to the front partition walls 18L and 18R, for example. These side wall portions 56L and 56R are connected to the front partition walls 18L and 18R, extend toward the bow side, and are interrupted at the front edges facing each other with the front access gate 51 interposed therebetween. Thereby, it is possible to access the water surface in front of the hull 2 from the front access gate 51 and to get into the hull 2 through the front access gate 51 from underwater.

The front partition walls 18L and 18R have rising walls 57L and 57R on the front deck 5 side. These rising walls 15 </ b> L and 15 </ b> R rise substantially vertically from the rear edge of the floor surface 50 a of the front deck 5. Thus, even if water enters the front deck 5, the water does not enter the cockpit 3.
In front of the steering handle 30, a semi-dome-shaped raised portion 52 that rises obliquely upward toward the steering handle 30 is formed in a region surrounded by a substantially V-shaped floor surface 50a. A handle holding portion 33 is attached to the raised portion 52.

  The handle holding portion 33 is coupled to the raised portion 52 so as to be freely opened and closed. More specifically, the handle holding portion 33 has a bonnet shape that is rotatable around a horizontal rotation axis along the left-right direction that is disposed at the rear end edge of the raised portion 52. Thereby, the front part of the handle | steering-wheel holding part 33 can be lifted and it can be in the state of FIG. 6C. A steering handle 30 is fixed to the rear portion of the handle holding portion 33, and left and right rearview mirrors 34L and 34R are fixed near the left and right side edges in front of the steering handle 30. Between these rearview mirrors 34L, 34R, there is provided a seat mounting portion 53 on which the fifth passenger seat 25 can be mounted and held. FIG. 6A shows a state in which the fifth passenger seat 25 is removed, and FIG. 6B shows a state in which the fifth passenger seat 25 is attached to the seat attachment portion 53.

The seat mounting portion 25 may have a cylindrical concave shape. As shown in FIG. 6C, the raised portion 52 is provided with a front storage portion 54 that can be opened and closed by the handle holding portion 33. That is, the front storage portion 54 is partitioned below the handle holding portion 33 in the closed state. The front storage portion 54 is configured to store the fifth passenger seat 25.
The fifth passenger seat 25 has a seat portion 25A and a shaft portion 25B fixed to the lower surface of the seat portion 25A. The shaft portion 25 </ b> B is configured to be fitted into the seat mounting portion 53 and to be held by the seat mounting portion 53. That is, the fifth passenger seat 25 is configured to be detachable from the seat mounting portion 53.

  The fifth passenger seat 25 is a seat that can be seated with the steering handle 30 in the back when attached to the seat attachment portion 53. The fifth passenger seat 25 may be configured to be rotatable around the shaft portion 25B. The seat surface 25a of the fifth passenger seat 25 is higher than the seat surface of the boat operator seat 13, and is higher than, for example, the steering handle 30. An occupant seated in the fifth passenger seat 25 can monitor the front water area of the hull 2 or can put out a fishing rod in front of the hull 2. That is, various activities can be performed in front of the hull 2.

The inner wall surfaces of the side wall portions 56L and 56R form inclined surfaces that rise obliquely upward from the floor surface 50a toward the outside. The inner wall surfaces of these side wall portions 56L and 56R provide a pair of footrests 55L and 55R. The passenger seated in the fifth passenger seat 25 can maintain the posture by placing his / her feet on the left and right footrests 55L and 55R.
An anti-slip sheet 58 (shown with cross-hatching) may be disposed on the floor surface 50a of the front hydrophilic region 50, the surface of the access gate 51, and the surfaces of the footrests 42L and 42R as necessary. .

FIG. 7 is a schematic side view showing a configuration in the hull 2 of the water jet propulsion boat 1. FIG. 8 is a schematic plan view showing the configuration inside the hull 2.
The inner space of the hull 2 is partitioned in the front-rear direction by a plurality of partition walls (bulkheads) 70 to 73, and is partitioned in the left-right direction by the plurality of partition walls 74 to 78, and the plurality of partition walls 79 is defined in the vertical direction. As a result, the fuel tank chamber 81 and the engine chamber 82 are partitioned below the tandem seat 12. Further, a large-capacity storage chamber 83 is partitioned in front of the fuel tank chamber 81, and a storage chamber 84 is partitioned laterally of the fuel tank chamber 81. A battery chamber 85 is defined on the side of the engine chamber 82. Floating body chambers 86, 87, and 88 for housing floating bodies are partitioned in front and sides of the large capacity storage chamber 83 and behind the battery chamber 85, respectively. Further, a jet unit chamber 90 is defined behind the engine chamber 82, and a water lock chamber 89 is defined between the jet unit chamber 90 and the floating body chamber 88. The information on the jet unit chamber 90 includes a storage chamber 80 that can be accessed by removing the seat of the fourth passenger seat 24, for example.

A fuel tank 91 is disposed in the fuel tank chamber 81. The fuel tank 91 is located below the boat maneuvering seat 13 and has a fuel supply port 91a above it. For example, the user can access the fuel supply port 91 a by removing the tandem seat 12 and supply fuel to the fuel tank 91.
An engine 95 is housed and fixed in the engine chamber 82. The engine compartment 82 is located substantially directly below the first passenger seat 21. The battery chamber 85 houses a battery 96 for supplying electric power to the electrical components of the engine 95 and other electrical components provided in the hull 2. In the water lock chamber 89, a water lock 97 interposed in the middle of the exhaust path of the engine 95 is accommodated. The water lock 97 is a sealed container and is connected to an exhaust pipe 98 from the engine 95 and an underwater exhaust pipe 99. Exhaust gas from the engine 95 is introduced into the water lock 97 through the exhaust pipe 98, and further discharged into the water near the stern of the hull 22 through the underwater exhaust pipe 99. The water lock 97 prevents water entering through the underwater exhaust pipe 99 from entering the exhaust pipe 98 side.

A jet propulsion device 100 is arranged in the jet unit chamber 90. The jet propulsion device 100 is driven by the driving force of the engine 95, and is configured to take water around the hull 2 from the bottom of the hull and inject it backward from the injection port 101.
FIG. 9 is a schematic cross-sectional view for explaining a configuration example of the jet propulsion device 100. The jet propulsion device 100 includes a drive shaft 103, an impeller 104, a deflector 105, and a reverse bucket 106 (not shown in FIGS. 1 to 8). A crankshaft 110 (or a transmission shaft coupled to the crankshaft) protrudes from the rear portion of the engine 95, and a coupling member 111 is attached to the rear end of the crankshaft 110. A drive shaft 103 is disposed behind the coupling member 111 so as to extend rearward. The drive shaft 103 is supported by a bearing 112 attached to the partition wall 73 of the hull 2. The bearing 112 is covered with a seal member 113 and is configured to suppress water from flowing into the engine chamber 82.

  An impeller 104 is attached to the rear portion of the drive shaft 103. The impeller 104 is fixed to the drive shaft 103 and is configured to rotate together with the drive shaft 103. Further, the impeller 104 is disposed in a water passage portion 121 formed in the lower rear portion of the hull 2 and pumps water from a water inflow portion 123 on the bottom 122 of the hull 2 and a water discharge portion 124 (nozzle at the rear of the hull 2 ) To inject water.

A deflector 105 is attached to the water discharge unit 124 to control the water injection direction to be changed to the left and right. The deflector 105 is configured to be rotatable in the left-right direction around the shaft portion 125 so as to be interlocked with the steering handle 30 (see FIG. 1). Water is jetted from the jet port 101 of the deflector 105 toward the rear of the hull 2.
The reverse bucket 106 that reverses the direction of the water sprayed from the water discharge portion 124 forward is attached to the water discharge portion 124 when moving backward. The reverse bucket 106 is configured to be rotatable in the vertical direction about the shaft portion 126. The reverse bucket 106 is arranged at a position (shown by a solid line) that is flipped upward when moving forward, and is arranged at a rear position (shown by an imaginary line) of the water discharge unit 124 when moving backward. .

The water discharge unit 124, the deflector 105, and the reverse bucket 106 are disposed in the pump chamber 107. The pump chamber 107 is partitioned by recessing the vicinity of the lower rear edge of the main body 2a of the hull 2 into a rectangular parallelepiped shape. Accordingly, the water discharge portion 124, the deflector 105, and the reverse bucket 106 are disposed in the water below the rear portion of the hull 2.
The engine 95 is an internal combustion engine and includes a cylinder body 131, a cylinder head 132, a cylinder head cover 133, and a crankcase 134 that houses the crankshaft 110. A piston 135 is slidably disposed on the inner peripheral surface of the cylinder body 131. An upper end portion of a connecting rod 136 is rotatably attached to the piston 135. The cylinder head 132 is disposed so as to close one opening of the cylinder body 131. The cylinder head 132 is provided with an intake valve 137 and an exhaust valve (not shown). The cylinder head 132 is further provided with a cam for moving an intake valve 137 and an exhaust valve (not shown) at a predetermined timing, and a camshaft for rotating the cam (both not shown).

The cylinder head 132 is provided with a spark plug 138. The tip of the spark plug 138 is disposed so as to protrude into the combustion chamber 139 defined by the cylinder body 131, the cylinder head 132, and the piston 135.
The cylinder body 131 is attached to the crankcase 134. The crankshaft 110 is supported while being sandwiched between the cylinder body 131 and the crankcase 134. The crankshaft 110 is attached to the crankcase 134 and the cylinder body 131 so as to extend in the front-rear direction.

Further, the lower end portion of the connecting rod 136 is rotatably attached to the crankshaft 110. Thereby, the crankshaft 110 is configured to rotate as the piston 135 slides up and down.
As described above, in the water jet propulsion boat 1 of this embodiment, since the cockpit 3 is surrounded by the wall surface, the water around the hull 2 does not easily enter. That is, the inside of the cockpit 3 is a dry area, and passengers in the cockpit 3 can avoid getting wet. On the other hand, the rear deck 4 has a rear hydrophilic region 40 opened rearward, and the front deck 5 has a front hydrophilic region 50 opened forward. The floor surface 40a of the rear hydrophilic region 40 has an inclination that goes downward, and the floor surface 50a of the front hydrophilic region 50 has an inclination that goes downward. Therefore, the water that has entered the hydrophilic regions 40 and 50 is guided to the floor surfaces 40a and 40b and is quickly drained from the access gates 41 and 51. An occupant who wants to enjoy swimming or the like can enter the surrounding water from the hydrophilic regions 40 and 50 or can enter the hull 2 from the water. In this way, both the needs of passengers who do not want to get wet and passengers who want access to the water can be satisfied at the same time.

  Moreover, a tandem seat 12 that is a saddle-ride type seat is disposed in the cockpit 3, and an engine 95 is disposed in a space below the tandem seat 12. Thereby, since it is not necessary to arrange | position an engine behind the cockpit 3, the full length of the hull 2 can be shortened. For example, the hull 2 can have a total length of about 4.5 meters and a total width of about 2 meters. Therefore, the hull 2 can be configured compactly.

  Thus, the water jet propulsion boat 1 belongs to a new category different from both conventional personal watercrafts and jet boats. In other words, the water jet propulsion boat 1 has a configuration in which the dry area (cockpit 3) and the hydrophilic regions 40 and 50 can coexist in the compact hull 2, and thus can be used easily and is occupant. It can be adapted to various needs.

  In the water jet propulsion boat 1 of this embodiment, the cockpit 3 is divided into two left and right regions 3L and 3R (wells 11L and 11R) by a tandem seat 12. Thereby, since the tandem seat 12 can be arranged in the center, it is easy to balance the left and right of the hull 2. The two left and right regions 3L and 3R serve as a occupant's living space. Therefore, fishing and other activities can be performed on the left and right of the hull 2. Since fishing and other activities are also possible in the hydrophilic areas 40 and 50 before and after the hull 2, the occupant on the hull 2 can perform fishing and other activities in the four directions of front and rear and right and left.

  Further, the tandem seat 12 is provided with a maneuvering seat 13 in the front and a first passenger seat 21 capable of seating up to two persons in the rear. Second and third passenger seats 22 and 23 are provided on the left and right of the first passenger seat 21. As a result, up to five passengers can be accommodated in the cockpit 3. When boarding alone, the occupant sits on the maneuvering seat 13. Since the maneuvering seat 13 is disposed at the center of the hull 2, the hull 2 has a good balance. When two people are on board, one person is seated on the maneuvering seat 13 and the other person is seated on the first passenger seat 21. Since the tandem seat 12 is located at the center of the hull 2, the hull 2 also has a good balance. When boarding by three people, one person can be seated on the maneuvering seat 13 and the other two persons can be seated on the first passenger seat 21. One person may sit on the boat operator seat 13 and the other two persons may sit on the second and third passenger seats 22 and 23. In any case, the hull 2 can have a symmetrical weight balance. When boarding with four people, if one person is seated in the maneuvering seat 13, one person is seated in the first passenger seat 21, and the remaining two persons are seated in the second and third passenger seats 22, 23, respectively, The right and left balance of the hull 2 can be achieved. When boarding with five people, if one person is seated in the maneuvering seat 13, two persons are seated in the first passenger seat 21, and the remaining two persons are seated in the second and third passenger seats 22, 23, respectively. Good. Thereby, the right and left balance can be taken. In this way, the weight balance in the cockpit 3 can be made substantially symmetrical with respect to the boarding of an arbitrary number of people of 1 to 5.

  Further, an engine 95 is disposed below the first passenger seat 21, and second and third passenger seats 22 and 23 are disposed on the left and right of the first passenger seat 21. Thereby, the center of gravity of the entire hull 2 including the occupant can be disposed in the vicinity of the engine 95. As a result, the engine 95 can be disposed in the space below the first passenger seat 21 to shorten the overall length of the hull 2, and at the same time, the center of gravity can be disposed rearward. The rear arrangement of the center of gravity can contribute to the establishment of motion performance (particularly turning performance) of the hull 2.

  Further, in this embodiment, since the fourth passenger seat 24 is provided on the rear deck 4, the passenger sits on the fourth passenger seat 24 to monitor the rear water surface and perform fishing. Can be. Since the rear deck 4 has a rear hydrophilic region 40 that is opened rearward, the seat in the cockpit 3 may be used when the water jet propulsion boat 1 sails at a high speed. The fourth passenger seat 24 is preferably used mainly when anchoring or moving at a low speed (for example, during trolling).

Furthermore, the fourth passenger seat 24 is adjacent to the first passenger seat 21 with the rear partition wall 15 in between behind the first passenger seat 21. Thereby, since the weight concentration to the vicinity of the engine 95 can be aimed at, it can contribute to establishment of the kinematic performance of the hull 2.
Moreover, since the 4th passenger seat 24 is orient | assigned to the back of the hull 2, the passenger | crew who seated on the 4th passenger seat 24 can show a fishing rod toward back, for example.

Further, the rear deck 4 is provided with footrests 55L and 55R configured to allow an occupant seated in the fourth passenger seat 24 to place his / her foot. The passenger in the fourth passenger seat 24 can maintain the posture by placing his / her feet on the footrests 55L and 55R.
In this embodiment, the left and right side walls 16L, 16R are provided with storage portions 19L, 19R for convenience of the passenger. In addition, the left and right regions 3L and 3R of the tandem sheet 12 are narrowed down. Thereby, since the movement range of a passenger | crew can be restrict | limited appropriately, stabilization of the hull 2 can be aimed at.

  Furthermore, in this embodiment, since the fifth passenger seat 25 is provided on the front deck 5, it is easy to perform fishing and other activities on the front side of the hull 2. Since the front deck 5 has a front hydrophilic area 50 opened forward, it is mainly used for anchoring or low speed movement (for example, during trolling), and in the cockpit 3 during high speed navigation. Use a seat. The fifth passenger seat 25 is arranged so that, for example, the center line C of the hull 2 passes through in plan view, as best shown in FIG. Thereby, the 5th passenger seat 25 can be arranged without impairing the balance of the hull 2.

  Furthermore, in this embodiment, since the fifth passenger seat 25 can be attached to and detached from the seat mounting portion 53 provided in the front deck 5, the fifth passenger seat 25 can be removed when unnecessary. For example, when navigating the water jet propulsion boat 1 at a high speed, it is preferable to remove the fifth passenger seat 25 to reduce the air resistance and further ensure a wide field of view for the operator. Further, when fishing or other activities are performed, or during low-speed navigation (for example, during trolling), it is preferable to attach the fifth passenger seat 25 to the seat mounting portion 53 to facilitate the activity on the front deck 5. . Moreover, in this embodiment, the front deck 5 is provided with a front storage portion 54 that can store the fifth passenger seat 25. Thereby, conveyance of the 5th passenger seat 25 becomes easy.

Further, in this embodiment, the hull edge of the front deck 5 is raised to form side walls 56L and 56R, and the footrests 55L and 55R are formed by the inwardly inclined wall surfaces. Therefore, an occupant seated in the fifth passenger seat 25 can maintain the posture by placing his / her feet on the footrests 55L and 55R.
In this embodiment, an arched traction tower 6 is provided, and towing can be performed using the traction tower 6. Specifically, a rope for towing a water skier or the like can be coupled to the towing tower 6. Since the traction tower 6 is formed in an arch shape having legs standing on the left and right side walls 16L, 16R, it can be arranged without impairing the comfortability of the cockpit 3 and the rear deck 4. In addition, since the traction tower 6 is disposed in the vicinity of the boundary between the cockpit 3 and the rear deck 4, it contributes to the rearward placement of the center of gravity of the hull 2. Thereby, it can contribute further to the establishment of the motion performance of the hull 2.

  Although one embodiment of the present invention has been described above, the present invention can be implemented in other forms. For example, although the water jet propulsion boat 1 according to the above-described embodiment includes the front deck 5 in the front portion as well as the rear portion of the hull 2, the front deck 5 may be omitted. In the above-described embodiment, the fifth passenger seat 25 that can be attached to and detached from the front deck 5 is provided, but the fifth passenger seat 25 may be omitted. Further, the fifth passenger seat 25 may be fixed to the front deck 5 so as to ensure the visibility of the operator.

Further, in the above-described embodiment, the fourth passenger seat 24 is provided in the rear deck 4, but the fourth passenger seat 24 may be omitted.
Furthermore, in the above-described embodiment, the configuration including the traction tower 6 is shown, but the traction tower 6 may be omitted.
In addition, various design changes can be made within the scope of matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Water jet propulsion boat 2 Hull 3 Cockpit 3L Left area 3R Right area 4 Rear deck 5 Front deck 6 Traction tower 10 Wall surface 11L Left well 11R Right well 12 Tandem seat 13 Maneuvering seat 15 Rear partition walls 16L, 16R Side walls 18L, 18R Front partition wall 18R Front partition wall 19L, 19R Storage section 20L, 20R Open / close lid 21 First passenger seat 22 Second passenger seat 23 Third passenger seat 24 Fourth passenger seat 25 Fifth passenger seat 30 Steering handle 33 Handle holding part 40 Rear hydrophilic area 40a Floor 41 Rear access gate 42L, 42R Footrest 50 Front hydrophilic area 50a Floor 51 Front access gate 53 Seat mounting part 54 Front storage part 55L, 55R Footrest 60 Towing plate 61L, 61R leg 62 tow hook 80 storage chamber 81 fuel Engine chamber 83 engine chamber 83 large capacity storage chamber 84 storage chamber 85 battery chamber 86-88 floating body chamber 89 water lock chamber 90 jet unit 91 fuel tank 95 engine 96 battery 97 water lock 100 jet propulsion device 101 injection port 103 drive shaft 104 impeller 105 Deflector 106 Reverse bucket 107 Pump chamber 110 Crankshaft

Claims (13)

The hull,
A cockpit placed in the center of the hull and surrounded by a wall on the entire circumference,
A rear deck disposed at the rear of the hull behind the cockpit and having a rear hydrophilic area opened to the rear;
A saddle-type maneuvering seat provided in the cockpit;
A jet propulsion device attached to the hull, which gives a propulsive force to the hull by sucking and injecting surrounding water;
A water jet propulsion watercraft including an engine attached to the hull and providing driving force to the jet propulsion device.   2. The water jet propulsion boat according to claim 1, wherein the saddle-ride type maneuvering seat extends in the front-rear direction of the hull and divides the inside of the cockpit into two left and right regions. A first passenger seat provided in the cockpit at the rear of the saddle riding type maneuvering seat;
The water jet propulsion boat according to claim 1 or 2, wherein the engine is disposed below the first passenger seat. A second passenger seat provided in the cockpit on the right side of the first passenger seat;
The water jet propulsion boat according to claim 3, further comprising a third passenger seat provided in the cockpit on the left side of the first passenger seat.   The water jet propulsion boat according to any one of claims 1 to 4, further comprising a fourth passenger seat provided on the rear deck.   The cockpit is partitioned by left and right side walls, and storage spaces are provided in the left and right side walls, thereby narrowing the left and right spaces of the saddle-ride type maneuvering seat. The water jet propulsion boat according to any one of the above.   The water jet propulsion boat according to any one of claims 1 to 5, further comprising a front deck that is disposed at a front portion of a hull in front of the cockpit and has a front hydrophilic region that is open to the front.   The water jet propulsion boat according to claim 7, further comprising a fifth passenger seat disposed on the front deck.   The water jet propulsion boat according to claim 7 or 8, further comprising a seat mounting portion arranged on the front deck and configured to be able to attach and detach the fifth passenger seat.   The water jet propulsion according to any one of claims 7 to 9, further comprising a storage portion that is arranged on the front deck and configured to receive a fifth passenger seat that can be attached to the seat attachment portion. Boat.   The water jet propulsion according to any one of claims 7 to 10, further comprising a footrest for a user who is formed in a shape rising from a hull edge of the front deck and seated on the fifth passenger seat. Boat.   The water jet propulsion boat according to any one of claims 6 to 9, wherein the front deck includes a floor surface that is inclined to descend toward the front.     The water jet propulsion boat according to any one of claims 1 to 12, further comprising an arch-shaped traction tower that is erected from right and left edges of the hull near the boundary between the cockpit and the rear deck. .

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