JP2635524B2 - Reverse device for water jet propulsion - Google Patents

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 reverse drive device which is reduced in size and weight.

[0002]

2. Description of the Related Art In recent years, in response to the need for high-speed marine transportation, a jet stream pressurized by a pump of a water jet propulsion device arranged at the stern is jetted from a jet nozzle, and the reaction force is used as a driving force. A sailing waterjet propulsion boat is in the spotlight. In such a water jet propulsion ship, it is strongly required that the water jet propulsion device be reduced in size and weight in order to travel at high speed.

[0003] An example of a reverse device of a water jet propulsion device is disclosed in Japanese Patent Application Laid-Open No. 5-278683. According to this, a steering cylinder that is rotatable to introduce a jet flow from the ejection nozzle is provided behind the ejection nozzle of the water jet propulsion device provided at the stern, and a hydraulic device is provided near the bottom rear end of the steering cylinder. A horizontal operating shaft that is rotationally controlled by the vehicle is provided in the lateral direction, and a plurality of jet shafts can be forwardly diverted to a steering cylinder bottom opening formed between the operating shaft and the bottom front end of the steering cylinder. A commutation plate is provided, and a flow path formed between the commutation plates can be closed in a substantially horizontal falling state, and a flap capable of closing a rear opening of a steering cylinder in an inclined standing state is provided on an operating shaft. It is installed. It is assumed that the forward / backward movement of the hull can be smoothly switched by the flap rotation control, the hull can be maintained in a neutral state, and the running resistance can be reduced.

[0004]

As shown in FIG. 6 (a front view of a steering cylinder), a lever 33 provided between an operating shaft 31 and a hydraulic device 32 in a general water jet propulsion machine including the above-mentioned prior art. Is located outside the steering cylinder 34, and the hydraulic device is also arranged near the center outside the steering cylinder side surface 34a. The lower end of the lever 33 is fixed to the operating shaft 31 to be integral therewith. Therefore, in order to transmit the movement of the lever 33 to the flap 35 via the operation shaft 31, transmission means such as a key 36 or a spline is required. This is because if the operating shaft 31 and the flap 35 are integrated, the flap 35 cannot be incorporated into or removed from the steering cylinder 34. The operating shaft 31 is connected to the flap 3
In addition to receiving the radial force acting on the flap 35, the key, keyway or spline for transmitting the operating torque of the flap 35 not only increases its size, but also
It causes weight increase. Reference numeral 37 denotes a jet nozzle.

If the hydraulic device 32 and the like are arranged near the center of the outside of the steering cylinder, the draft becomes deep when the boat is running at a low speed or when the boat is stopped (the water surface WL at this time is near the upper surface of the steering cylinder 34). The hydraulic device 32 will be submerged or exposed to the sea surface, and will be damaged due to corrosion of the hydraulic device 32 and the adhesion of marine products, etc., resulting in impaired function and lack of reliability of the device. There are also problems.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a water jet propulsion reversing device that is reduced in size and weight while ensuring the reliability of the device. And

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a water jet propulsion device in which a left-right swingable steering cylinder is mounted behind a jet nozzle, and the steering cylinder is provided in an inclined upright state. In a water jet propulsion device having a flap located on a curved straightening plate provided at a bottom opening of the steering cylinder when the rear opening of the steering cylinder is closed and in a lying state, a bearing provided near the center of the side surface of the steering cylinder A rotation support shaft is supported on the cylinder, and the rotation support shaft is detachably attached to the lever so that the lever is rotatable around the rotation support shaft. A hydraulic device is connected to the upper end, and the flap shaft is fixed to a lever extension extending below the pivot, and a flap is integrally attached to the flap shaft, and the lever is steered. The side of the tube It is a backward system of the water jet propulsion unit which is provided on the inside.

According to a second aspect of the present invention, in the first aspect, the flap shaft is provided at a position below the rotation support shaft at a predetermined interval, and the flap lower surface plate is located at the rearmost position when the flap is inclined and standing. And a rear end device of the water jet propulsion device in which a rear end portion of the lower surface plate is curved so as to be continuous with the curved straightening plate located at the position shown in FIG.

According to a third aspect of the present invention, a closing plate is provided on the curved portion formed at the rear end of the lower surface plate of the second embodiment so as to cover the upper end of the curved straightening plate located at the rearmost position in the upright state of the flap. It is a reverse device of the water jet propulsion system installed continuously.

According to a fourth aspect of the present invention, there is provided a water jet propulsion device for reversing a water jet propulsion device according to any one of the first to third aspects, wherein the lever is installed inside the steering cylinder and outside the ejection nozzle diameter.

According to a fifth aspect of the present invention, there is provided a water jet propulsion reversing device according to any one of the first to fourth aspects, wherein the lever has a streamlined inner cross-sectional shape.

[0012]

According to the first to fifth aspects, since the hydraulic device is located above the steering cylinder, the hydraulic device is not immersed in seawater or exposed to the sea surface even when the ship is stopped or at a low speed, so that corrosion and marine organisms are prevented. Adhesion and the like are avoided.

In addition, since the rotation support shaft of the lever is provided near the center of the steering cylinder and the lever is provided inside the steering cylinder, the flap shaft is fixed to the lower end of the lever, and the flap is fixed to this flap shaft. Also, while making it removable,
The movement of the lever can be transmitted without operating the key via a key or a spline, and the size of the flap shaft can be reduced.

In particular, according to the second aspect of the present invention, since the flap shaft is disposed below the rotation support shaft, the lower surface plate of the flap can be connected to the curved rectifying plate, and the reverse flow path can be made smooth. And the reverse drive ability can be improved. According to the third aspect of the present invention, since the gap between the rear end of the flap lower surface plate and the upper end of the curved rectifying plate is closed by the closing plate, the leakage of the jet flow from the gap can be reduced, and the reverse drive ability can be further improved. There is action.

According to the fourth aspect of the present invention, the jet stream does not directly hit the lever.
Therefore, even if the edge of the jet stream hits the lever, the jet stream is less disturbed, and the jet is smoothly ejected backward.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a water jet propulsion machine, showing a forward state of a ship in which a jet stream passes through a steering tube and is jetted in a stern direction (rearward). FIG.
(a) The hydraulic device is operated to turn the jet flow vertically downward with the inclined flap in an upright position, and furthermore, it is a plurality of curved straightening plates installed at the bottom of the steering cylinder. It is in a reverse state of the ship gushing out.

As shown in FIGS. 1 and 2 (a), a circular jet nozzle 2 is provided at the rear end of a pump 1 constituting a water jet propulsion device provided at the stern.
The front end of a rectangular steering cylinder 5 is pivotally mounted by upper and lower vertical pins 4 provided on a bracket 3 projecting rearward from the ejection nozzle 2. Therefore, the steering cylinder 5 can be swung horizontally around the vertical pin 4, and this operation causes a turning motion of the boat.

A base end of a hydraulic cylinder 6 which is a hydraulic device is pivotally connected to a front end of an upper portion of the steering cylinder 5, and a rod end 6a of the hydraulic cylinder 6 is provided with a lever 7 having a substantially rectangular shape. It is connected to the upper end. Accordingly, the hydraulic cylinder 6, during its operation, located in the steering cylinder 5 upper, even in quarantine, even during low speed cruising (water surface WL ₁ at this time is near substantially the upper surface of the steering cylinder 5) sea It will not sink or be exposed to the sea. Note that W
L ₂ shows the water surface of the high-speed ocean-going travel time.

As shown in the front view of the steering cylinder 5 in FIG.
A bearing cylinder 8 is provided near the center of the side surface 5a of the steering cylinder 5, and a turning support shaft 9 of a lever 7 is fitted into the bearing cylinder 8;
A flange 9 a of the rotation support shaft 9 is fixed to an end surface of the bearing cylinder 8 with a bolt. The rotation support shaft 9 extends from the steering cylinder side surface 5a to the inside, and a portion of the lever 7 that is bent in a U-shape is pivotally supported by the rotation support shaft 9. And is rotatable along the steering cylinder side surface 5a.

Although the lever 7 is located inside the steering cylinder side surface 5a, it is located outside the ejection nozzle diameter 2a as shown in FIG. Does not directly hit the lever 7 and does not become a resistance. Even when the lever 7 is located near the ejection nozzle 2, as shown in FIG.
If the cross-sectional shape on the inner side of (a) is streamlined, even if the jet stream hits the lever 7, the jet stream hardly disturbs the flow, so that there is not much resistance.

The lower end of the lever 7 extends below the position supported by the rotation support shaft 9, and a flap shaft 10 is fixed to the lever extension 7a by welding. The flap 11 is fixed to the flap shaft 10. Even if the lever 7 is fixed to the flap shaft 10, the removal is not affected because the rotation support shaft 9 is provided separately and the rotation support shaft 9 is detachable from the steering cylinder 5.
Therefore, the flap 11 can be directly fixed to the flap shaft 10. Since there is no need to connect a key or a spline for transmitting the operating torque, the diameter of the flap shaft 10 can be reduced correspondingly, which can contribute to weight reduction.
FIG. 5 is a modified example of FIG. 4 in which the rotation support shaft 9 is fixed to the lever 7 side. The same components as those in FIG. 4 are denoted by the same reference numerals, and detailed description is omitted. In addition, in FIG. 4, FIG.
Reference numeral 13 denotes a bearing and a liner, respectively.

As shown in FIG. 1, when the hydraulic cylinder 6 is shortened, the flap 11 is
, The rear end opening 5A of the steering cylinder 5 is fully opened, and the jet stream is jetted straight rearward to generate a forward thrust. At this time, the flap upper surface plate 11a
Is lower than the jet nozzle 2, so that the jet flow is not hindered.

As shown in FIG. 2 (a), a plurality of curved rectifying plates 15 are arranged in a row at the bottom opening 5B of the steering cylinder 5.
A flow path for turning the jet flow forward is formed between them. The bottom surface of the steering cylinder 5 is formed to be inclined obliquely downward toward the rear, so that the curved rectifying plate 15a located at the rearmost end can secure a sufficient length for turning and rectifying the jet flow. Has become. This, coupled with the continuity of the end portion of the flap 11 described later with the curved portion 11d,
Without weakening the momentum of the jet flow turned on the flap 11 (this has the greatest effect on the reverse thrust), the jet flow smoothly discharges forward to increase the reverse thrust.
In FIG. 2 (a), although a lower end of the curved rectifier plate 15 protrudes from the bottom surface of the steering cylinder 5, since the water surface WL ₂ fast Kou traveltimes is in this lower, to produce resistance writing a water surface Absent. Depending on the position of the water surface WL ₂ does not protrude from the bottom surface of the steering column 5 the lower end of the curved rectifier plate 15, for example, may be flush.

As shown in FIG. 3, the flap 11 comprises an upper plate 11a, a lower plate 11b, and vertical ribs 11c provided between the upper and lower plates at regular intervals in the horizontal direction. The upper surface plate 11a and the lower surface plate 11b are in contact with each other at a front end position, and have a double plate structure in which a rear end portion is opened in a wedge-shaped cross section so as to sandwich the flap shaft 10. Since the double plate structure has high rigidity, the thickness of each member can be reduced, so that the weight is reduced as a whole as compared with the conventional case (a single plate provided with a reinforcing rib).

As shown in FIG. 2A and FIG.
Has a curved portion 11d such that the rear end of the flap lower surface plate 11b has a curved surface that is continuous with the curved-type straightening plate 15a positioned at the rearmost portion, thereby forming a jet flow. A flow path to ensure smooth turning is formed. In this case, a gap is formed between the front end of the curved straightening plate 15a located at the rearmost portion and the rear end of the flap lower surface plate 11b, and it is conceivable that the jet flow leaks from this gap. Therefore, as shown in a modification of FIG. 2 (b), a closing plate 11e is integrally connected to the curved portion 11d at the rear end of the flap lower surface plate so as to extend the same, and the flap is in an upright state. By setting the closing plate 11e to cover the upper end of the current plate 15a, it is possible to reduce the leakage of the jet flow from the gap and to further improve the reversing ability. Even if the jet stream is diffused by bending the rear end portion of the flap upper surface plate 11a, there is no problem of reducing the resistance of the jet stream.

When the vehicle is moving backward, the hydraulic cylinder 6 is extended and the lever 7 is tilted backward as shown in FIG. 2 (a), so that the flap 11 is tilted upright and the jet flow is prevented from jetting forward. , The jet stream hitting the flap 11 is turned downward, and the curved current plate 15
It squirts in the forward direction of the ship, and the ship receives reverse thrust by the reaction force.

[0027]

According to the first to fifth aspects of the present invention, since the hydraulic device is located above the steering cylinder, the hydraulic device is not immersed in seawater or exposed to the sea surface even when the ship is stopped or at a low speed, so that corrosion and marine organisms are prevented. Since the adhesion can be avoided, the reliability of the device can be improved.

Since the rotation support shaft of the lever is provided near the center of the steering cylinder and the lever is provided inside the steering cylinder, even if the flap shaft is fixed to the lower end of the lever and the flap is fixed to this flap shaft, The operating torque can be transmitted without using a key or a spline for the movement of the lever, and the size of the flap shaft can be reduced.

In particular, in the second aspect, the lever is extended from the rotation support shaft, and as a result of fixing the flap shaft to this extended portion,
Since the flap shaft is located below the rotation support shaft, the flap bottom plate can be connected to the curved rectifying plate when the flap is brought upright and inclined, so that a smooth reverse flow path can be formed, The ability can be improved. Furthermore, according to the third aspect of the present invention, the gap between the rear end of the flap lower surface plate and the upper end of the curved rectifying plate can be closed by a closing plate, so that the jet flow is prevented from leaking from the gap, and the reversing ability is further improved. Can be achieved.

According to the fourth aspect, the jet flow does not directly hit the lever. In the fifth aspect, even if the jet flow hits the lever provided inside the steering cylinder, the jet flow is disturbed. It is less spilled out smoothly and does not weaken propulsion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a steering cylinder and the like including an ejection nozzle at the time of forward movement (flap down state) in the invention according to this application.

2 (a) is a longitudinal sectional view of a steering cylinder or the like including an ejection nozzle when the vehicle is traveling backward (in a state where the flap is tilted upright), and FIG. 2 (b) is a blockage plate connected to a curved portion formed at the rear end of the flap lower surface plate. It is a principal part figure at the time of setting.

FIG. 3 is a perspective view of a flap portion including a flap shaft.

FIG. 4 is a front view of the steering cylinder and the like.

FIG. 5 is a modified example of a procedure for attaching a rotation support shaft.

FIG. 6 is a front view of a conventional steering cylinder including a flap, an operating shaft, and a lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pump 2 ... Jet nozzle 5 ... Steering cylinder 5a ... Steering cylinder side surface 6 ... Hydraulic cylinder (hydraulic device) 7 ... Lever 9 ... Rotation support shaft 10 ... Flap shaft 11 ... Flap 11d ... Bending part 11e ... Closure plate 15 ... Curved straightening plate

Claims (5)

(57) [Claims] 1. A left-right swingable steering cylinder is mounted behind a jet nozzle of a water jet propulsion device, and a rear opening of the steering cylinder is closed in an inclined standing state and a bottom portion of the steering cylinder in a falling state. In a water jet propulsion device provided with a flap located on a curved straightening plate provided in an opening, a rotation support shaft is supported on a bearing cylinder provided near the center of the side surface of the steering cylinder, and the rotation support shaft is mounted on the watercraft. A hydraulic device is connected to the upper end of the lever that extends to above the steering cylinder while being detachably attached to the lever to make the lever freely rotatable around the pivot. A water jet propulsion device wherein the flap shaft is fixed to a lever extending portion extending downward, a flap is integrally attached to the flap shaft, and the lever is provided inside the steering cylinder side surface. Backward equipment. 2. A flap shaft is provided at a predetermined distance below the pivot shaft so that the flap lower surface plate is continuous with the rearmost curved straightening plate when the flap is inclined and standing. 2. The reversing device for a water jet propulsion device according to claim 1, wherein a rear end of the lower plate is curved. 3. A closing plate which is continuously provided on the curved portion at the rear end portion of the flap lower surface plate according to claim 2 so as to cover the upper end portion of the curved type straightening plate located at the rearmost position in the upright state of the flap. The reverse drive device of the water jet propulsion device according to claim 2, wherein 4. The lever according to claim 1, wherein the lever is installed inside the steering cylinder and outside the diameter of the jet nozzle.
3. The reverse travel device of the water jet propulsion device according to any one of 3). 5. The reversing device for a water jet propulsion device according to claim 1, wherein an inner cross-sectional shape of the lever is streamlined.