JPH04218487A - Water jet propulsion boat - Google Patents

Abstract

PURPOSE:To prevent the adhesion of barnacles in the passage of a jet unit at the unused time and bear the lateral component force of propulsion force acting upon the jet unit by other members. CONSTITUTION:A jet unit 3 with a built-in impeller 20 is disposed in the recessed space 1a of a stern bottom part. This jet unit is provided with a water suction port 30 opened to the bottom, a water jet port 8 for jetting water in a passage 37 toward behind the stern. There is provided an elevating/driving means for elevating the jet unit 3, and this elevating/driving means is connected to the jet unit 3 around the impeller disposed part of the jet unit. A supporting part 41 is further formed to support a part around this connection part from both lateral sides in such a way as to be relatively movable in the vertical direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet propulsion boat that glides on water.

0002

2. Description of the Related Art Recently, water jet propulsion boats that glide on the water surface and perform various movements have come into wide use. In this jet propulsion boat, a jet unit (propulsion device) is arranged at the stern end of the bottom of the boat, and is arranged so that it does not protrude rearward to the stern or below the bottom of the boat. Then, an impeller that rotates within the flow path formed in the jet unit sucks water from the bottom of the ship and injects water backward from the stern through the water jet port at the rear end of the flow path, and this water jet port is vertically By swinging around the axis, the hull is propelled and turned, allowing it to glide on the water surface.

[0003] There is also an outboard engine type jet boat, but in this structure, a jet unit is attached to the stern end of the boat so that it can be raised and lowered, and this jet unit protrudes significantly toward the rear of the boat.

0004

[Problems to be Solved by the Invention] In the above-mentioned conventional water jet propulsion boat, the flow path of the jet unit is located below the waterline when it is stopped, so it is difficult to keep it moored at a quay when not in use. , barnacles and the like will adhere to the flow path of the jet unit. For this reason, there is a problem in that it takes a lot of effort to clean it during use. Further, in order to prevent this, it is necessary to raise the hull on land when not in use, and this handling operation is also very complicated. In addition to the cleaning work, it is also necessary to inspect the jet unit, and this work is also very time-consuming.

[0005] It is also conceivable to raise the jet unit above the water surface when berthed using an elevating drive means, but if such a configuration is adopted, the jet unit will be able to move up and down, making it difficult to move normally. The support and fixation of the jet unit becomes incomplete when running. In that case, the lateral component of the propulsion turning force due to the rotation of the water injection port will act on the impeller shaft, so it is necessary to provide a means to receive this component force at a part other than the impeller shaft. Become.

[0006] The present invention was made to solve such conventional problems, and by equipping the jet unit with an elevating and lowering drive means, it is possible to move the boat into the flow path without having to land the boat when it is not in use. It is an object of the present invention to provide a water jet propulsion boat that can prevent barnacles from adhering to the watercraft and has means for receiving a lateral component of the propulsion force in its configuration.

[0007]

[Means for Solving the Problems] In the present invention, a jet unit containing an impeller is disposed at the bottom of the stern, an engine for driving the impeller is disposed in front of the jet unit, and the jet unit opens below the water surface. It has a water suction port and a water injection port that injects the water in the flow path toward the rear of the stern, and is provided with an elevating drive means for raising the jet unit relative to the hull. A support portion is formed to support the device so that it can be moved relative to the device from both sides in the vertical direction.

A recess for accommodating the jet unit is formed in the bottom of the stern, and a bracket, a pair of elevating arms, and an elevating drive means are disposed in the recess, and the bracket is connected to the partition wall of the recess. a front wall that is attached to the front wall and has holding parts for the lifting and lowering drive means formed on both sides of the upper end thereof;
It consists of a bottom wall that forms a water suction port, and both side walls that have thrust receivers that guide the vertical movement of the lifting arm near its rear end and restrict its lateral movement. is swingably attached to the side wall of the bracket, and its distal end holds the jet unit via a connecting member, and the elevating drive means has its proximal end attached to the holding portion of the bracket, and its distal end moves upward and downward. Preferably, it is connected to an arm.

Further, the jet unit may be provided with a rotational drive means for rotating at least a part of the jet unit including the suction port of the jet unit about the axis of the impeller shaft.

0010

[Operation] According to the above structure, when the boat is at anchor, the jet unit is raised by the lifting drive means, thereby positioning the water suction port of the jet unit above the water line to prevent water from entering the flow path. be able to. Further, the lateral component of the propulsion force is received by the support portions on both sides of the jet unit, and does not act on the impeller shaft. In addition, in a structure in which the jet unit is held movably up and down in a recess by a bracket, an elevating drive means, an elevating arm, etc., the bracket attached to the partition wall of the recess is used to hold the hydraulic cylinder, the elevating arm, and the jet unit held there. The mounting positions of various members such as the holding cylinder can be accurately and easily determined. Further, by providing a rotation drive means for rotating the jet unit, the water suction port can be directed upward.

[0011]

[Example] In Fig. 1, a hull member 1 constituting a ship bottom plate
2 and a deck member 11 constituting the upper deck are each integrally formed of FRP, and are joined together at the peripheral edge to form the hull 10. A seat (not shown) is formed behind the center of the hull 10, and an operating handle 10a is provided on the front side of the seat.

[0012] An engine room 18 is formed in the hull 10, and the engine 1 is installed therein. Further, a recess 1a is formed on the rear side with a partition wall 15 in between, and a jet unit 3 is disposed in this recess 1a, so that the jet unit 3 is damaged by objects outside the hull (for example, driftwood) and becomes inoperable. We are trying to prevent this from becoming impossible. The engine 1 is a mount member 14
is supported by the hull member 12.

As shown in FIGS. 2 to 5, the jet unit 3 is configured to be movable up and down in the recess 1a by means of a bracket 4, a hydraulic cylinder (elevating drive means) 50, an elevating arm 5, and the like. As shown in FIG. 5, the bracket 4 is composed of both side walls 41, a bottom wall 42 between the both side walls 41, and a front wall 43. A water suction hole 42a is formed in the bottom wall 42, and a water suction hole 42a is formed in the bottom wall 42. On both sides of the upper end, holding portions 45 for lifting drive means having a U-shaped planar shape are formed. Further, jet units 3 are provided on the outer surfaces of the rear ends of both side walls 41, respectively.
A thrust receiver (supporting portion) 41a is formed to guide the vertical movement of and receive a force in the left and right direction. In this embodiment, the thrust receiver 41a is indirectly formed on the hull 10 side by being provided on the bracket 4 fixed to the hull 10, but it is directly formed on the hull member 12 by being provided on the hull member 12. It may be formed on the 10 side. This side wall 4
On the outside of 1, lifting arms 5 are connected by pins 5a, respectively.
The proximal end of is rotatably attached.

The base end portions of the hydraulic cylinder devices 50 are fitted into the U-shaped portions and attached to the pair of holding portions 45 by pins 45a, and the hydraulic cylinder devices 5
The tip of the piston rod 50c is connected to the lifting arm 5.
The jet unit 3 is connected to a flange 51 formed at an intermediate portion of the jet unit 3 by a pin 50a, and these constitute an elevating means for the jet unit 3.

A hydraulic pump 56 for the hydraulic cylinder device 50 is attached to the front surface of the partition wall 15, and the operation of the hydraulic pump 56 causes the piston rod 50c to extend and contract, causing the lifting arm 5 to rotate around the pin 5a. The inner surface 5d in the vicinity of the tip of the holder 5 contacts and slides against the thrust receiver 41a, thereby restricting movement in the left-right direction and allowing smooth vertical movement. Further, a receiving portion 41c is formed at the upper end of the thrust receiving portion 41a, and a stopper 5c is formed to protrude from the inner surface of the lifting arm 5 at a position corresponding to the receiving portion 41c. The lowering position of the lifting arm 5 is determined.

As shown in FIGS. 2 and 5, the jet unit 3 includes a water introduction part 31 having a shaft guide part 31a, a cylindrical part (impeller housing) 32 connected to the rear end by a flange, and a rear end. and an impeller duct portion 34 connected to the jet unit 3 by a flange, and these constitute the front portion of the jet unit 3. A water suction port 30 is formed at the lower end of the water introduction part 31, and a flange 38 is formed at the periphery of the water suction port 30. A gasket 38a is sandwiched between the flange 38 and the bottom wall 42 to open the water suction port 30. Ensure that the surrounding area is sealed. Further, a screen 39 is attached to the water suction port 30 in order to prevent foreign matter from flowing into the flow path 37.

A gear 33 is integrally formed on the outer periphery of the impeller duct portion 34.
4 is rotatably fitted into the holding cylinder 60 via a bush 62. Further, a holding cylinder 61 is coupled to the rear end of the holding cylinder 60, and the holding cylinders 60 and 61 are held by connecting members 55 that are respectively attached to the inside of the distal end of the lifting arm 5 so as to face each other. . Further, a conical part 35 having a tapered internal flow path is connected to the rear end of the holding cylinder 61, and a vertical axis 8 is connected to the rear end of this conical part 35.
A water injection port 8 that swings around zero in a horizontal plane is attached.

Further, as shown in FIGS. 5 and 6, mounting members 71 and 72 are attached to the holding cylinder 61.
A drive motor (rotation drive means) 7 is disposed on the outer circumference of the drive motor 7, and a pinion 70 attached to the rotation shaft 7a of the drive motor 7 is held in the mounting members 71 and 72, and the holding cylinder 60 A notch 60a formed in a part of
It faces the inside through the impeller duct part 34 and meshes with the gear 33 on the outer periphery of the impeller duct part 34. Further, the drive motor 7 is fixed to the holding cylinder 60 by a bolt passing through a flange formed integrally with the drive motor 7. Therefore, the drive motor 7
When the gear 33 is rotated via the pinion 70,
The impeller duct part 34 integrated with this gear 33, the impeller housing 32 connected to this, and the introduction part 31
, flange 38, and gasket 38a will rotate.

As shown in FIGS. 2 to 4, the water injection port 8 has an arm 82 and a pin 81 that swing around a pin 82a.
A reverse gate 81 is attached that swings around a to open and close the rear surface of the water injection port 8.The arm 82 opens and closes the reverse gate 81, and the arm 82 is opened and closed by pushing and pulling the operating rod 83 from the cockpit. The reverse gate 81 is opened and closed via the reverse gate 81.

As shown in FIGS. 2 and 5, the drive shaft 13 of the engine 1 passes through the partition wall 15, and its penetrating portion is supported by a bearing member 16 via a bearing 16a. A universal joint 46 and an impeller shaft 2 are sequentially connected to the rear end, and an impeller 20 is connected to the rear end of the impeller shaft 2.
is attached, the tip of the impeller shaft 2 is supported by a bearing 34a formed at the center of the stationary blade 34b in the impeller duct part 34, and the impeller 20 is arranged to rotate in the impeller housing 32. There is. The drive shaft 13 is sub-assembled with a universal joint 46, and is spline connected to the engine side. On the other hand, impeller shaft 2
is sub-assembled with the impeller side, and is connected to the universal joint 46 by a spline connection.

A housing 49 is connected to the tip of the shaft guide portion 31a, and a pair of arms 49c are formed at the front end of the housing 49. A housing 47 is provided which has two arms, both of which are connected to each other by a horizontal connecting shaft 47a so that the housing 49 can swing about the connecting shaft 47a. This housing 47 and 4
Expandable boots 48 are fitted around the outer peripheries of the boots 9 and fixed with bands 48a, respectively. A universal joint 46 is installed in these housings 47 and 49.
and the impeller shaft 2 passes through the housing 49
Inside, it is supported by a bearing 49a, and the connecting shaft 47a of the housing and the bending axis of the universal joint 46 are positioned on the same line. In addition,
The connecting shaft 47a is a pin 5a that becomes the rotation axis of the lifting arm 5.
Both are located on the same line.

Furthermore, an inspection port 9 that can be opened and closed is formed in the upper wall 19 of the recess 1a, so that a person on the boat 10 can inspect and clean the jet unit 3 through this inspection port 9. I have to.

In the above configuration, the person on the seat grips the operating handle 10a to drive the engine 1 in the state shown by the solid line in FIGS. By suctioning water and ejecting it in a predetermined direction behind the stern through the water injection port 8, the hull 10 is propelled and turned.

While the hull 10 is running, especially when turning, a lateral force in the direction opposite to the turning direction acts near the rear end of the jet unit 3, trying to move the jet unit 3 laterally. However, in the jet unit 3, the impeller duct portion 34 is held by the lifting arm 5 via the connecting member 55, and the lifting arm 5 is guided by the thrust receiver 41a of the bracket 4 so as not to move laterally. In addition, no force other than the axial direction acts on the impeller shaft 2 even when turning.

Furthermore, while the hull 10 is running, the waterline 90 is lowered, so if there is a gap around the flange 38, there is a high possibility that air will be sucked through the gap and into the flow path 37. This may reduce propulsion efficiency. Therefore, in order to prevent such a phenomenon from occurring, the above configuration is provided with a gasket 38a to prevent the generation of gaps that would cause air to be sucked in.

Furthermore, when the boat body 10 is stopped, the water suction port 30 is located below the waterline 90, and therefore the flow path 3
7. There will be water inside. Therefore, from the state shown by the solid line in FIGS. 1 to 3, the hydraulic cylinder 50 is operated to rotate the lifting arm 5 around the pin 5a via the flange 51, as shown by the imaginary line in FIG. 2 and in FIG. 4. Connecting member 5
5 to raise the jet unit 3. On this occasion,
A large compressive force is applied to the jet unit 3 in the direction of the impeller shaft 2, but this force is received by the pair of lifting arms 5, and the impeller shaft 2
Do not apply excessive compressive force to the

As the jet unit 3 rises, the impeller shaft 2 also bends at the universal joint 46 that connects to the drive shaft 13. Also, due to this rise, the water suction port 30 comes to be located above the water line 90, and the gear 33 is further rotated from the operating shaft of the rotary drive motor 7 via the pinion 70.
3, the impeller housing 32 connected thereto, and the water introduction part 31 are rotated. This causes the water suction port 30 to face upward, making it easier to perform work through the inspection port 9. Further, during this rotation, members such as the conical portion 35 and the water injection port 8 do not rotate because they are connected to the holding cylinder 61 held by the lifting arm 5, and therefore the operating members such as the operating rod 83 do not rotate. is prevented from being twisted.

Further, in the above structure in which the jet unit 3 is held movably up and down in the recess 1a by the bracket 4, the hydraulic cylinder (lift drive means) 50, the lift arm 5, etc., the jet unit 3 is attached to the partition wall 15 of the recess 1a. The hydraulic cylinder 50 and the lifting arm 5 are positioned and held by the bracket 4, and the holding cylinder 60 of the jet unit 3 is attached to these, so that the mounting position of each member can be determined. Therefore, various members can be assembled into the recess 1a accurately and easily. In this embodiment, a part of the jet unit 3 is rotated around the axis of the impeller shaft 2, but the entire jet unit 3 may be rotated.

[0029]

As explained above, according to the present invention, when the boat is berthed, the jet unit is raised by the elevating means, thereby positioning the water suction port of the jet unit above the waterline to prevent water from flowing into the flow path. can be prevented from entering. Therefore, it is possible to reliably prevent barnacles from adhering to the flow path during berthing.

Furthermore, while the boat is running, especially when turning, a lateral force in the direction opposite to the turning direction acts near the rear end of the jet unit, trying to move the jet unit laterally. Since the jet unit is supported by a support provided on the hull side so that it can move relative to the left and right sides in the vertical direction, no force other than the axial force acts on the impeller shaft even when turning.

Furthermore, if the jet unit is held movably up and down in the recess by a bracket, an elevating drive means, an elevating arm, etc., the hydraulic cylinder, the elevating arm, and the The mounting position of the holding tube of the held jet unit is determined, and therefore various members can be assembled into the recess accurately and easily.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a boat hull showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 6;

FIG. 3 is a side view of the propulsion unit.

FIG. 4 is a view corresponding to FIG. 3 in a state where the propulsion device is raised.

FIG. 5 is an exploded perspective view of the propulsion unit.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3;

[Explanation of symbols]

1 Engine 1a Recess 2 Impeller shaft 3 Jet unit 4 Bracket 5 Lifting arm 7 Drive motor (rotation drive means) 9 Inspection port 10 Hull 20 Impeller 30 Water suction port 37 Channel 41a Thrust receiver 50 Lifting cylinder (lifting drive means) )55 Connecting member

Claims (3)

[Claims] Claim 1: A jet unit having a built-in impeller is disposed at the bottom of the stern, and an engine for driving the impeller is disposed in front of the jet unit, and the jet unit has a water suction port opening below the water surface and a flow path. It has a water injection port for injecting the water inside to the rear of the stern, and is provided with an elevating drive means for raising the jet unit with respect to the hull, and on the hull side, the jet unit can be moved relative to the vertical direction from both left and right sides. A water jet propulsion boat, characterized in that a support portion is formed to support the water jet. 2. A recess for accommodating the jet unit is formed in the bottom of the stern, a bracket, a pair of elevating arms, and an elevating drive means are disposed in the recess, and the bracket serves as a partition of the recess. a front wall that is attached to the wall and has holding portions for lifting and lowering drive means formed on both sides of the upper end;
It consists of a bottom wall that forms a water suction port, and both side walls that have thrust receivers that guide the vertical movement of the lifting arm near its rear end and restrict its lateral movement. is swingably attached to the side wall of the bracket, and its distal end holds the jet unit via a connecting member, and the elevating drive means has its proximal end attached to the holding portion of the bracket, and its distal end moves upward and downward. The water jet propulsion watercraft according to claim 1, wherein the water jet propulsion watercraft is connected to an arm. 3. The jet unit is provided with rotational drive means for rotating at least a part of the jet unit including a suction port of the jet unit around an axis of an impeller shaft. 2. The water jet propulsion boat described in 2.