JPH0339871B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a small personal watercraft of the type that is operated by riding on a rear deck and grasping a handle attached to the front of the hull, and particularly relates to a planing means for the personal watercraft. Regarding the structure of

[Conventional technology]

The above-mentioned type of small personal watercraft is mainly used for leisure or sports purposes, such as running around on the water near the coast or walking on the water, and has high speed (for example, 50 km/h) performance and high maneuverability.

The structure of such a small personal watercraft includes, for example, an engine mounted in an engine room formed at the front of the hull, a propulsion unit mounted at the rear of the hull, and passengers mounted on the rear deck behind the engine room. It is designed to operate while supporting the body by grasping the handle attached to the handle.

Further, a propeller, a jet pump, or the like is used as the propulsion device, and in the case of a jet pump, it can be steered by changing the jet direction.

[Problem to be solved by the invention]

However, conventional small personal watercraft of the above type are not equipped with any means to adjust the angle of attack of the planing surface on the bottom of the boat. There was an inconvenience that the impact of the waves of time could not be prevented.

In addition, for high-speed boats, etc., for example,
As seen in -275, it has been proposed to improve the planing performance by installing hydrofoils that can be raised and lowered at the front of the hull. However, if this structure were applied to a small personal watercraft, the wings would only move up and down, and the running resistance of the hull would be large and discontinuous, resulting in large horsepower losses and reduced maneuverability. There is the inconvenience of putting it away.

[Purpose of the invention]

The present invention has been made in view of the prior art as described above, and an object of the present invention is to easily and quickly increase lift to a desired value while minimizing an increase in running resistance. Therefore, it is possible to easily enter a planing attitude, and it is also possible to maintain course stability during planing and shock reduction function in waves, and to improve high-speed running performance and maneuverability during turning. An object of the present invention is to provide a small personal watercraft capable of maintaining performance.

[Means for solving problems]

The present invention provides a small personal watercraft of the type that is operated by riding on a rear deck and grasping a handle attached to the front of the hull. A sliding plate having a substantially V-shaped cross section that coincides with the bottom surface of the ship is brought into close contact with the bottom surface of the ship through a hinge having a transverse axis, and its front end is pivotally supported so that it can be rotated and operated by the operator. At high speeds, the sliding plate is rotated from its normal position at an angle of attack of 0, where it is in close contact with the bottom surface of the ship, to an operating position at a desired angle of attack, where the rear part of the sliding plate projects downward. The above object is achieved by increasing the head-up angle of the bow.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

1 and 2 show a plan view and a side view of a small watercraft according to an embodiment of the present invention.

In FIGS. 1 and 2, an engine room 1 is formed in the front part of the hull, and an engine 2 installed in the engine room 1 drives a propulsion machine 4 provided at the rear of the bottom of the ship via a drive shaft 3. Ru.

The rear deck 5 behind the engine room 1 is the part on which the operator rides, and the operator operates while supporting his body by grasping a handle 6 attached to the front of the hull.

Fin portions 7, 7 projecting upward are formed on both sides of the rear deck 5, and a riding floor 8 is formed between these fin portions 7, 7.
In addition, the dashed-dotted line W in FIG. 2 exemplifies the water surface.

The rider rides on the riding floor 8 in a normal standing position, and the fins 7 on both sides prevent the rider's feet from slipping off during high-speed riding, and also have a wave-shielding function.

A hinge 10 having a transverse axis is provided on the bottom 9, and a sliding plate 11 is rotatably supported on the hinge 10. The angle of attack (rotation position) of this sliding plate 11 is controlled by a foot operating means (pedal) 12 provided on the rear deck 5. FIG. 3 shows a side surface of the mounting portion of the sliding plate 11, and FIG. 4 shows a cross section of FIG. 3.

In FIGS. 3 and 4, the sliding plate 11
is connected to the pedal 12 on the step 8 by a connecting means 13 passing through the hull vertically. In the illustrated example, the connecting means 13 is configured by integrating a rod 14 that passes through the step 8, a hollow frame 15 for avoiding interference with the drive shaft 3, and a rod 16 that penetrates the bottom 9. It is urged upward by a return spring 17 mounted between the bottom 9 and the inner surface of the bottom 9. Watertight bearing portions 18, 18 are provided at the portions of the step 8 and the bottom 9 through which the rods 14, 16 pass.

The sliding plate 11 has a substantially V-shaped cross section as shown in FIG.
It has a shape that substantially matches the V-shaped cross-sectional shape of , and has a structure that does not increase running resistance.

Further, as shown in the figure, the sliding plate 11 is attached to the approximate center of the ship bottom 9 in the front-rear direction and the left-right direction,
It has a width that is half or more than the width of the bottom of the ship, and a length of about one-fifth of the length of the ship in the fore-and-aft direction.

In the normal running state when the pedal 12 is not operated, the sliding plate 11 is biased counterclockwise (or upward) by the return spring 17 to a zero angle of attack position (the position shown by the solid line) where the entire surface is in close contact with the bottom 9. Retained.

If a planing surface with a desired angle of attack is required, such as when you want to take a planing position with less resistance (or impact) when cruising at high speed, or when you want to quickly enter a planing state when jumping, etc., press down on the pedal 12 to plan. The plate 11 is rotated to form a sliding surface with a desired angle of attack θ as shown by the two-dot chain line.

Of course, this angle of attack θ can be freely changed depending on the running condition or wave condition, and the pedal 12 can be released to return it to zero.

According to the embodiment described above, the sliding plate 11 has V
Since the ship has a V-shaped cross section at the same angle so as to be closely spaced along the bottom 9 of the ship's cross section, the running resistance does not increase when the angle of attack is 0, and even when the angle of attack is θ, the running resistance increases. can be minimized.

In addition, by adjusting the angle of attack θ during high-speed running,
You can easily enter a gliding position by increasing lift.

Further, even when the angle of attack is set to θ during high-speed planing, the function of making the cross section of the bottom 9 V-shaped (detdrision function), that is, the function of providing stability on the route and reducing shocks in waves, is maintained.

Therefore, by using both the steering angle and the angle of attack θ of the sliding plate 11 during high-speed turns, it has become possible to maintain high-speed running performance and maneuverability during turns.

Note that the angle of attack θ can be set in a range of, for example, 0 degrees to 25 degrees, but as the speed increases, even a small angle of attack (for example, 5 degrees or less) can greatly improve the glide performance.

In addition, since the configuration is such that the angle of attack θ of the gliding surface can be freely adjusted by operating the gliding plate 11 with the pedals 12, the angle of attack θ of the gliding surface can be arbitrarily and continuously controlled in any running condition. be able to.

In addition, in the above embodiment, the pedal 12 and the sliding board 1
1 is directly connected, however, it is also possible to use a fulcrum 19 and a lever 20 as shown in FIG. 5, so that the structure can be operated at a desired lever ratio.
Other reference numbers in FIG. 5 indicate corresponding parts in FIGS. 3 and 4, respectively.

In addition to the pedal method shown in the figure, various driving methods such as a link method, a control cable method, or a hydraulic type or an electric type can be used as the operating means for the sliding board 11. In addition, it can also be operated manually using a lever provided on the handle 6 or the like.

It can also be operated automatically in conjunction with engine rotation.

[Effects of the Invention] As is clear from the above description, according to the present invention, in a small personal watercraft of the type that is operated by riding on the rear deck and grasping a handle attached to the front of the hull, the cross section of the bottom surface is omitted. A sliding plate that is V-shaped and has a substantially V-shaped cross section that coincides with the bottom surface of the ship is brought into close contact with the bottom surface of the ship through a hinge that has a transverse axis at approximately the center of the ship bottom in the longitudinal and lateral directions. Desirably, the front end of the sliding plate is rotatably supported, and the rear part of the sliding plate projects downward from a normal position where the sliding plate is in close contact with the bottom surface of the ship, by an operating means operated by the operator. By rotating the angle of attack to the operating position, the bow angle is increased at high speeds, so lift can be easily and quickly increased to the desired value while minimizing increases in running resistance. Therefore, it is possible to easily enter the planing position.Moreover, since the cross-sectional shape of the planing plate has a V-shaped cross section with the same angle that can be brought into close contact with the bottom of the ship, it can be easily used during high-speed cruising. Even when the angle of attack is θ, the cross section of the bottom of the ship is V.
It is possible to maintain the function of creating a shape (detsudrying function), that is, the function of route stability and shock reduction in waves, and it is possible to maintain high-speed running performance and maneuverability when turning etc. Ta.

[Brief explanation of drawings]

FIG. 1 is a plan view of a small personal watercraft according to an embodiment of the present invention, FIG. 2 is a left side view of FIG. 3 is a cross-sectional view taken along the line - in FIG. 3, and FIG. 5 is a schematic explanatory view of a sliding plate mounting portion according to another embodiment. 5...Rear deck, 6...Handle, 9...Bottom, 10...Hinge, 11...Sliding plate, 12...
Operation means (foot operated), θ...Angle of attack.

Claims (1)

[Claims] 1. In a small skiing boat that is operated by riding on the rear deck and grasping a handle attached to the front of the hull, the cross section of the bottom surface is approximately V-shaped, and there is a horizontal A sliding plate having a substantially V-shaped cross section that coincides with the bottom surface of the ship is brought into close contact with the bottom surface of the ship via a hinge having a directional axis, and its front end is rotatably supported, and the operating means is operated by the operator. By rotating the planing plate from its normal position at an angle of attack of 0, where it is generally in close contact with the bottom surface, to an operating position at a desired angle of attack, where the rear part of the planing plate protrudes downward, the bow of the ship at high speeds can be adjusted. A small planing boat characterized by an increased head-up angle.