JPH04228392A - Water jet propulsion boat - Google Patents

Abstract

PURPOSE:To prevent the adhesion of barnacles in the passage of a jet unit without landing a boat body at the unused time and eliminate a problem such as the twist of a deflector operating cable and the like. CONSTITUTION:A jet unit 3 disposed at the stern bottom is provided with a front part having a water lead-in port 31 opened below the water level and a cylinder part 32 connected thereto, a holding cylinder 60 for holding the cylinder part 32 rotatably, and a rear part having a deflector 8 and the like. The front part and the rear part are connected in a mutually rotatable state, and a hydraulic rotating means for rotating only the front part is provided with a recessed part 70 formed on the outer peripheral surface of the cylinder part 32, a piston 7 for partitioning this recessed part 70 into oil pressure chambers on both circumferential sides, and a hydraulic pump 56 for supplying oil to both oil pressure chambers.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a water jet propulsion boat that slides 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 hull, and is arranged so that it does not protrude behind the stern or below the bottom of the boat. Then, an impeller that rotates in a flow path formed in the jet unit sucks water from the bottom of the ship and injects the water from the stern backward through a deflector at the rear end of the flow path, and this deflector oscillates around a vertical axis. By moving, the hull is propelled and turned, allowing it to glide on the water surface.

0003

[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. Furthermore, in order to prevent this, it is necessary to raise the hull on land when not in use, and this handling work 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.

[0004] In order to solve this problem, it is conceivable to rotate the jet unit around the impeller axis so that the water suction port faces upward to prevent water from entering the flow path. However, since a deflector is provided at the rear of the jet unit, and an operating cable for swinging the deflector in a horizontal plane is connected, various inconveniences arise when the rear part is rotated together. It turns out.

That is, if the entire jet unit is rotated around the longitudinal axis, the cables for operating the deflector will be twisted and the durability of the cables will be reduced. It is necessary to create slack in the cables, but providing this slack not only worsens the appearance, but also poses a risk of the slack getting caught in the movable parts.

[0006] The present invention has been made to solve the above-mentioned problems, and by equipping the jet unit with a rotation means of a compact configuration, the boat can be operated without having to land the boat when 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 inside of the flow path, and that does not cause problems such as twisting of deflector operating cables in its configuration. It is something to do.

[0007]

[Means for Solving the Problems] According to the present invention, a jet unit having a built-in 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. a front part having a water introduction part and a cylindrical part connected to the rear side of the water introduction part; a holding cylinder rotatably holding the cylindrical part; and a conical part connected to the rear side of the holding cylinder; a rear part having a deflector connected to the rear side of the conical part, and the front part and the rear part are coupled to each other so as to be rotatable about an axis in the front-back direction, and the front part has a deflector connected to the rear side of the conical part. Hydraulic rotation means for rotating the cylinder is provided, and the hydraulic rotation means is fitted into the recess formed in the outer circumferential surface of the cylindrical portion and extending in the circumferential direction, and is inserted into the recess through the holding cylinder and rotates the recess on both sides in the circumferential direction. It is equipped with a piston that defines a hydraulic chamber, and a hydraulic pump that is connected to supply oil to both hydraulic chambers.

[0008]

[Operation] According to the above structure, when the boat is at anchor, only the front part of the jet unit is rotated by supplying oil from the hydraulic pump to the hydraulic chamber formed between the cylinder part and the holding cylinder. The water suction port of the jet unit can be positioned above the waterline to prevent water from entering the flow path. Further, since the rear portion of the jet unit is not rotated during this rotation, the operating cables of the deflector and the like are not twisted, so there is no problem such as deterioration of their durability.

[0009]

[Example] In Fig. 2, a hull member 1 constituting a ship bottom plate is shown.
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.

[0010] An engine room 18 is formed in the hull 10, and the engine 1 is installed therein. Further, on the rear side, a recess 1a is formed across the partition wall 15, and the jet unit 3 is disposed in this recess 1a.
This prevents the equipment from becoming damaged and inoperable. The engine 1 is supported by the hull member 12 by a mount member 14.

As shown in FIGS. 1 and 3 to 5, the jet unit 3 is configured to be movable up and down in the recess 1a using a bracket 4, a hydraulic cylinder (lifting means) 50, a lifting arm 5, etc. There is. Bracket 4 is
As shown in FIG. 6, it 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 on both sides of the upper end of the front wall 43. A holding portion 45 for the lifting drive means is formed with a U-shaped planar shape. Further, thrust receivers (supporting portions) 41a are formed on the outer surfaces of the rear ends of the side walls 41, respectively, to guide the vertical movement of the jet unit 3 and to receive forces in the left and right directions. The base end portions of the lifting arms 5 are rotatably attached to the outsides of the both side walls 41 by pins 5a, respectively.

The base end portions of the hydraulic cylinders 50 are fitted into the U-shaped portions of the pair of holding portions 45, and the pins 4 are inserted into the pair of holding portions 45.
5a, and the tip of the piston rod 50c of this hydraulic cylinder 50 is connected to a rib 51 formed in the middle part of the elevating arm 5 by a pin 50a, and these constitute elevating means for the jet unit 3. .

[0013] A hydraulic pump 5 for the hydraulic cylinder 50
6 is attached to the front of the partition wall 15, and this hydraulic pump 5
6, the piston rod 50c is expanded and contracted to rotate the lifting arm 5 around the pin 5a, and the inner surface 5d near the tip of the lifting arm 5 comes into contact with the thrust receiver 41a and slides, thereby moving in the left-right direction. is regulated to ensure smooth vertical movement. A receiving portion 41c is formed at the upper end of the thrust receiving portion 41a, and a stopper 5 is formed on the inner surface of the lifting arm 5 at a position corresponding to the receiving portion 41c.
c is formed to protrude, and this stopper 5c is connected to the receiving part 41.
The lowering position of the elevating arm 5 is determined by contacting with c.

The jet unit 3 has a water introduction part 31 having a shaft guide part 31a, and a cylindrical part (impeller housing 32 and impeller duct part 34) connected to the rear end by a flange. The front part of the Note that the impeller housing 32 and the impeller duct portion 34 have a cylindrical shape in which both the inner circumferential surface and the outer circumferential surface are circular in cross section, and the impeller duct portion 34 is connected to the rear end of the impeller housing 32 by a flange. . A water inlet 30 is formed at the lower end of the water inlet 31, and a flange 38 is formed at the periphery of the water inlet 30. A packing 38a is sandwiched between the flange 38 and the bottom wall 42, and 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. An oil seal 38b is installed between the shaft guide portion 31a and the propeller shaft 2, which allows the flow path 37
Prevents air from entering inside.

As shown in FIGS. 1 and 6, the transmission 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 attached to the rear end of this impeller shaft 2. Bearing 34 formed in the center
The impeller 20 is arranged to rotate within the impeller housing 32 while being supported by the impeller 20 .

The transmission shaft 13 and the universal joint 46 are sub-assembled and connected to the engine side by spline. On the other hand, the impeller shaft 2 is sub-assembled with the impeller side, and is spline-coupled to the universal joint 46.

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.
The impeller shaft 2 passes through the housing 49 and 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.

The impeller duct part (inner cylinder) 34 constituting the cylinder part is rotatably fitted into the holding cylinder (outer cylinder) 60. In this embodiment, the impeller housing 32 and the impeller duct part 34, which constitute the cylinder part, have a cylindrical shape with both the inner circumferential surface and the outer circumferential surface having a circular cross section. The outer peripheral surface of the portion of the cylindrical portion that is fitted into the holding tube 60 may have a circular cross section, and the impeller duct portion 34 may be configured to be rotatable within the holding tube 60. That is, for example, the outer peripheral surface of the impeller housing 32 located outside the holding cylinder 60 may be formed to have a rectangular cross section. Further, this holding cylinder 60 is held on both sides by connecting members 55 that are attached to the inside of the tip of the lifting arm 5 so as to face each other. Further, a spacer 61 and a conical part (nozzle) 35 having a tapered internal flow path are coupled to the rear end of the holding cylinder 60.
A deflector 8 is attached to the rear end of the conical portion 35 and swings in a horizontal plane about an axis 80 in the vertical direction. The holding cylinder 60, the spacer 61, the conical part 35, the deflector 8, and the like constitute the rear part of the jet unit. Note that the conical portion 3 in this embodiment
5 is formed to have a conical shape, but it is sufficient that the diameter of the cross section decreases as it goes downstream, and the cross section may be an ellipse.

An arm 82 that swings around a pin 82a and a reverse gate 81 that swings around the pin 81a to open and close the rear surface of the deflector 8 are attached to the deflector 8. The arm 82 opens and closes the reverse gate 81. The reverse gate 81 is operated via the arm 82 by pushing and pulling the operating cable 83 from the cockpit.
It opens and closes.

Further, as shown in FIG. 5, an arm 8a is attached to the deflector 8 and projects laterally. An operating cable 8c is connected to this arm 8a, and the operating cable 8c can be pushed or pulled. This allows the deflector 8 to swing around an axis 80 in the vertical direction via the arm 8a. The operating cable 83 and the operating cable 8c are locked on the connector 55 by a locking device 8d and guided into the front engine room 18 through one side of the jet unit 3.

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

As shown in FIGS. 7 and 8, a recess 70 extending in the circumferential direction is formed on the outer peripheral surface of the impeller duct portion 34, and the piston 7 is fitted into this recess 70 through the holding cylinder 60. The recess 70 is defined by the piston 7, and hydraulic chambers 70c and 70d are defined on both sides of the piston 7 in the circumferential direction. A packing 71 is arranged around this recess 70. Also, orifices with check valves arranged in opposite directions are formed in the piston 7 to prevent the pressure in the hydraulic chambers 70c and 70d from rising above a certain level.

As shown in FIG. 9, a hydraulic cylinder 50 constituting a hydraulic elevating means for raising and lowering the jet unit 3, and hydraulic chambers 70c and 70d constituting a hydraulic rotating means for rotating the jet unit are provided with a hydraulic cylinder 50 for driving the jet unit 3. A drive source (hydraulic pump) 56 is connected, and this hydraulic pump 56
The hydraulic cylinder 50 and the hydraulic chambers 70c and 70d are connected by a flow path control means 7a. The flow path control means 7a includes a pilot check valve 72 connected to the hydraulic pump 56, and a line 77 on one side of the pilot check valve 72 is connected to a first check valve arranged in parallel and opposite directions. It is connected to the head side of the hydraulic cylinder 50 via the valve 73 and the second check valve 74, and is also connected to the hydraulic chamber 70d, and the other line 78 is connected to the third check valve 75 and the fourth check valve 74. Hydraulic chamber 70c via check valve 76
It is connected to the rod side of the hydraulic cylinder 50.

In the above configuration, a person on the seat grips the operating handle 10a to drive the engine 1 in the state shown by the solid line in FIGS. Suction water and deflector 8
By injecting the fuel to the stern through the vessel, 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, causing the jet unit 3 to move 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. Therefore, no force other than the axial force acts on the impeller shaft 2 even during 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 the occurrence of such a phenomenon, the above configuration is provided with a packing 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 has water in it. Therefore, the jet unit 3 is raised, but a packing 38a is disposed between the peripheral edge (flange) 38 of the water suction port 30 of the jet unit 3 and the bottom plate 42.
In this embodiment, the following operations are performed to protect the camera. That is, the flow path control means 7
When the jet unit 3 is in the lowered state, first the hydraulic elevating means is operated to raise the jet unit 3, and after the operation is completed, the hydraulic rotating means is driven. Further, when the jet unit 3 is in the ascending state, the hydraulic rotation means is first operated to rotate the jet unit, and after the operation is completed, the hydraulic lifting means is operated.

That is, from the state of FIG. 1, the hydraulic pump 56
When driven, as shown in FIG. 9, the pilot piston 72a of the pilot check valve 72 moves leftward to supply oil to the rod side of the hydraulic cylinder 50 through the line 78, causing the jet unit 3 to rise. At this time, the spring setting pressure of the third check valve 75 is set high to block the flow of oil, and the jet unit 3 is not rotated because no hydraulic pressure is supplied to the hydraulic chamber 70c.

By the above operation, the lifting arm 5 is rotated around the pin 5a via the rib 51 by the operation of the hydraulic cylinder 50 from the state shown by the solid line in FIGS. 1 to 3, and the jet unit 3 is rotated via the connecting member 55. to rise. As the impeller shaft 2 rises, the impeller shaft 2 also bends at the universal joint 46 that connects to the transmission shaft 13. Also, due to this elevation, the water suction port 30 is positioned above the water line 90. At this time, a large compressive force will be applied to the jet unit 3 in the direction of the impeller shaft 2, but this force will be received by the pair of elevating arms 5, so that an excessive compressive force will not be applied to the impeller shaft 2. do not have.

After the hydraulic cylinder 50 is fully compressed, the oil pressure rises, and when it exceeds the set pressure, oil also flows into the oil pressure chamber 70c, causing the impeller duct 34 to move in the direction of arrow A in FIG. The jet unit 3 rotates as shown in FIG. 10, and the front portion of the jet unit 3 rotates. That is, from the raised state of the jet unit 3, the impeller duct part 34, the impeller housing 32 connected thereto, the water introduction part 31, the flange 38, and the packing 38
The front portions of the jet unit, such as a and screen 39, rotate. This rotational operation causes the water suction port 30 to face upward as shown by the imaginary line in FIG. 1 and in FIG. 4, making it easier to perform work through the inspection port 9. Further, during this rotation, the rear portions of the jet unit such as the conical portion 35 and the deflector 8 do not rotate because they are connected to the holding cylinder 60 held by the lifting arm 5. Therefore, the operation cable 83 , 8c, etc. are prevented from being twisted.

Furthermore, when the hydraulic pump 56 is driven from the state shown in FIG. 4, the pilot piston 72a of the pilot check valve 72 moves rightward to supply oil to the hydraulic chamber 70d through the line 77, causing the jet unit 3 to move in the direction indicated by the arrow in FIG. Rotate in direction B so that the water suction port 30 faces downward. At this time, the spring setting pressure of the first check valve 73 is set high and blocks the flow of oil, and the hydraulic cylinder 50
is not operated, but after the impeller duct portion 34 rotates fully, the oil pressure rises, and when it exceeds the set pressure, oil begins to flow into the head side of the hydraulic cylinder 50 through the first check valve 73. , the hydraulic cylinder 50 is driven as shown in FIG.
As shown in the figure, the jet unit 3 descends and returns to the running state.

Note that in the above embodiment, the jet unit 3
Although only an example is shown in which the jet unit 3 is rotated after being raised, it is also possible to rotate only the front portion of the jet unit 3 without providing an elevating means. Furthermore, although the jet unit 3 in this embodiment is housed in a recess 1a that is open only to the rear, it does not necessarily have to be housed in the recess. It may be housed inside.

[0033]

As explained above, according to the present invention, when the boat is berthed, the jet unit is rotated by the rotating means, thereby positioning the water suction port of the jet unit above the waterline and connecting it to the flow path. You can prevent water from entering. Therefore, it is possible to reliably prevent barnacles from adhering to the flow path during berthing.

Further, in the jet unit, the front part including the water suction port and the rear part including the deflector are connected to each other so as to be rotatable around an axis in the front and back direction, and at this joint part, the inner cylinder and the outer cylinder are used to control the hydraulic pressure by the hydraulic chamber. Since the rotating means is formed, the structure of the rotating means can be made very compact. In addition, since only the front part is rotated by this rotation means, when the jet unit is rotated, the rear part of the jet unit, such as the conical part and the deflector, does not rotate. Therefore, the operation cable and lead wire etc. The operating members of the system do not get twisted, so the durability of the cables does not deteriorate, and the appearance is excellent because there is no need to leave the cables slack, and the cables do not get caught in moving parts. No problem.

[Brief explanation of the drawing]

FIG. 1 is an enlarged longitudinal sectional view of a propulsion unit showing an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the hull of FIG. 1;

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 a horizontal sectional view of the propulsion unit.

FIG. 6 is an exploded perspective view of the propulsion unit.

FIG. 7 is a cross-sectional view of the rotating part of the propulsion device.

FIG. 8 is a partial vertical sectional view of the propulsion device.

FIG. 9 is a circuit diagram of a hydraulic rotation means for controlling the rotation of the propulsion device.

FIG. 10 is a circuit diagram showing another example of hydraulic rotation means.

[Explanation of symbols]

1a Recess 2 Impeller shaft 3 Jet unit 4 Bracket 5 Lifting arm 7 Piston 8 Deflector 10 Hull 20 Impeller 30 Water suction port 31 Water introduction part 32 Impeller housing 34 Impeller duct part 35 Cone-shaped part 37 Flow path 50 Hydraulic cylinder 56 Hydraulic pump 60 Holding tube 70c, 70d Hydraulic chamber 83,8c Operation cable

Claims (1)

[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 introduction section that opens below the water surface, and a water introduction section that opens below the water surface. A front part having a cylinder part connected to the rear side, a holding cylinder rotatably holding the cylinder part, a conical part connected to the rear side of the holding cylinder, and a conical part connected to the rear side of the conical part. a rear portion having a connected deflector, the front portion and the rear portion are coupled to each other so as to be rotatable about an axis in the front-rear direction, and hydraulic rotation means for rotating only the front portion is provided. The hydraulic rotation means is provided with a recess extending in the circumferential direction formed on the outer circumferential surface of the cylindrical portion, and a piston that is fitted into the recess through the holding cylinder and partitions the recess into hydraulic chambers on both sides in the circumferential direction. A water jet propulsion boat characterized by comprising a hydraulic pump connected to supply oil to both hydraulic chambers.