JPH08324492A - Device for reverse moving of water jet propulsion machine - Google Patents

Abstract

PURPOSE: To provide a device for reverse moving of a water jet propulsion machine, in which the light weight and the reliability are achieved. CONSTITUTION: A steering cylinder 5 capable of horizontally oscillated is mounted in the rear of a jet nozzle 2 of a water jet propulsion machine, and a flap 11 for blocking the rear opening of the steering cylinder 5 in the inclined and erected stated and to be positioned on bent-type straightening plates 12 in the falling state is provided. A steering cylinder side wall 5b is backward extended into a nose shape, a rotational supporting shaft 9 is supported on the tip of the nose part 5c, an intermediate part of a lever 7 is attached around the rotational supporting shaft 9, a hydraulic cylinder 7 is connected to the upper end of the lever 7 extending to the upper part of the steering cylinder 5, a flap shaft 10 is fixed on the lower end, and the flap 11 is integrally mounted on the flap shaft 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing device for a water jet propulsion device in which the size, weight, and reliability of the device are improved.

[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.

An example of a reverse device for a water jet propulsion machine is disclosed in Japanese Patent 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. By controlling the flap rotation, the ship can be switched forward and backward smoothly, the ship can be kept in a neutral state, and the running resistance can be reduced.

[0004]

As shown in FIG. 4 (a front view of a steering cylinder), a lever 33 provided between an operating shaft 31 and a hydraulic device 32 is used 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 and integrated with the operating shaft 31. Therefore, in order to transmit the movement of the lever 33 to the flap 35 via the actuating shaft 31, a 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
Not only the radial force acting on 5 is received, but also there is a key, a key groove or a spline for transmitting the operating torque of the flap 35, so that not only the size thereof is increased, but also
It causes the 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.

In view of the problems of the prior art, it is an object of the invention of the present application to provide a water jet propulsion backward drive device that is light in weight and has improved reliability. It is in.

[0007]

In order to achieve the above object, the means of claim 1 is to provide a horizontally swingable steering cylinder behind a jet nozzle of a water jet propulsion machine, and a plurality of steering cylinders are provided at the bottom of the steering cylinder. In a water jet propulsion machine equipped with a plurality of curved straightening vanes arranged in a row, and a flap that is displaced between an upright state and a fallen state inclined by the operation of a lever, only the side wall of the steering cylinder is attached to the rear end of the upper wall. A lever which extends further backward from the position and which is supported on the side wall at the protruding end is provided with an intermediate portion of the lever attached to the pivot shaft, and which extends below the pivot shaft by a predetermined distance. This is a reverse device of a water jet propulsion machine in which a flap shaft of the flap is fixed to a lower end portion, and the flap is integrally attached to the flap shaft.

According to a second aspect of the present invention, there is provided a water jet according to the first aspect, wherein only the side wall of the steering cylinder projects in a nose shape further rearward from a rear end position of the upper wall, and a rotation support shaft is provided at a tip of the nose. This is a reverse device for a propulsion device.

According to a third aspect of the present invention, there is provided a water jet propulsion reversing device according to the second aspect, wherein the lower part of the nose has a cut portion into which the flap shaft can enter in a standing state where the flap is inclined.

According to a fourth aspect of the present invention, the flap is composed of an upper plate, a lower plate, and a reinforcing rib provided between the upper plate and the lower plate. At the end, the flap shaft is disposed so as to be sandwiched between the two, the rear end of the flap lower surface plate is curved, and the curved portion and the curved straightening plate located at the rearmost end in the upright state in which the flap is inclined. This is a reverse device of a water jet propulsion device in which a substantially continuous reverse flow path is formed therebetween.

According to a fifth aspect of the present invention, in the configuration of any of the first to fourth aspects, the upper portion of the lever extends above the upper wall of the steering cylinder, and the rod end of the hydraulic cylinder constituting the driving device is provided at the upper end of the lever. And a water jet propulsion device in which a base of the hydraulic cylinder is held by a bridge extending upward from an upper wall of the steering cylinder.

[0012]

According to the first to fifth aspects of the invention, the lever shaft is fixed to the lower end of the lever by making the intermediate part of the lever rotatably supported by the side wall (that is, removable). Further, even if the flap is fixed to the flap shaft, the flap can be detached. As a result, the operating torque can be transmitted without the movement of the lever through the key or the spline, and the size of the flap shaft can be reduced, so that the weight is reduced. Since only the side wall is projected rearward, weight increase can be minimized.

In particular, according to the second aspect of the present invention, only the side wall is projected in a nose shape, and the pivotal support shaft is provided at the nose portion projecting end, whereby the weight increase due to the rearward extension of the side wall can be suppressed as much as possible. Further, it becomes easy to form a cut portion for the flap shaft to enter.

In particular, according to the means of claim 3, the flap shaft can smoothly transition to the standing state in which the flap is inclined without the flap shaft interfering with the side wall by the notch.

In particular, according to the fourth aspect of the present invention, by forming a substantially continuous reverse flow path between the rear end portion of the flap lower surface plate and the curved rectifying plate, the reverse flow can be smoothed and the reverse performance can be improved. . Since the flap shaft is provided so as to be sandwiched between the flap upper surface plate and the lower surface plate, rigidity and strength of the flap can be easily secured.

In particular, in the means of claim 5, since the hydraulic cylinder and the like are located above the steering cylinder, they are not submerged in the seawater or exposed to the seawater even when the ship is stopped or at a low speed, and are not corroded or marine. The attachment of living things is avoided, which contributes to the improvement of the reliability of the device.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the invention according to this application will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a water jet propulsion device, showing a forward state of a ship in which a jet stream passes through a steering tube and is jetted in the stern direction (rearward). Figure 2
Activates the driving device to turn the jet flow vertically downward with the inclined flap in the upright position, and then uses a plurality of curved straightening plates installed at the bottom of the steering cylinder to jet the jet flow in the bow direction (forward). The ship is in reverse. FIG. 3 is a front view (partially shown in cross section) of the steering cylinder when viewed from the rear.

As shown in FIGS. 1 to 3, a pump 1 constituting a water jet propulsion device provided at the stern portion is shown.
At the rear end, a circular ejection nozzle 2 is provided. 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. I have. Therefore, the steering cylinder 5 is horizontally swingable around the vertical pin 4, and this operation causes the turning motion of the ship.

The side wall 5b of the steering cylinder 5 has a nose-shaped rear end edge of the side wall 5b which extends further rearward than the end of the upper wall 5a. An intermediate portion (a portion slightly above the lower end portion) of the lever 7 is pivotally supported by the protruding end of the nose portion 5c of the side wall 5b. Cut into a curved shape forward following the lower part of the nose 5c,
The curved cut portion 5d is continuous. And the side wall bottom part 5e is continuing with this curved cut part 5d. The edge of the side wall bottom 5e extends slightly downward as it goes backward from the position of the bracket 3.

A curved straightening vane 12 is provided on the side wall bottom portion 5e. That is, as shown in FIG. 2, a plurality of curved straightening plates 12 are provided at the bottom opening of the steering cylinder 5 at regular intervals in the front-rear direction, and the jet flow is turned forward between them. A flow channel to be formed is formed.

The upper end of the lever 7 has a steering cylinder upper wall 5a.
The upper end of the lever is connected to a rod end 6a of a hydraulic cylinder 6 that constitutes a driving device, and a base of the hydraulic cylinder 6 extends upward from an upper wall 5a of the steering cylinder 5. (FIG. 3). Therefore, the hydraulic cylinder 6 keeps the upper wall 5 of the steering cylinder 5 during its operation.
It is located above a, and may be submerged in the sea or exposed to the sea surface even when the ship is stopped or traveling at low speed (the water surface WL ₁ at this time is almost near the upper surface of the steering cylinder 5). There is no such thing. Note that WL ₂ indicates the water surface during high-speed cruising. The rear end of the flap 11 (the front end is a free end) is pivotally attached to the lower end of the lever 7. In the forward movement state, the flap 11 is horizontally lying above the straightening vane 12.

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 wall 5b of the steering cylinder 5, and a turning support shaft 9 of a lever 7 is fitted into the bearing cylinder 8;
A lever is pivotally supported by the pivot shaft 9, and a flange 9a of the pivot shaft 9 is fixed to the lever 7 by a bolt 9b. Therefore, the lever 7 can be removed from the steering cylinder 5 together with the flap 11 by removing the rotation support shaft 9.

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. Then, the flap 11 described above is fixed to the flap shaft 10. The flap 11 is composed of a lower surface plate 11a, an upper surface plate 11b, and reinforcing ribs 11c provided between them. At the rear end of the flap 11, the reinforcing rib 11 is sandwiched between the flap lower surface plate 11a and the upper surface plate 11b.
A flap shaft 10 is provided so as to penetrate through c. The rear end of the flap lower surface plate 11a is formed in a curved shape, and when the flap 11 is tilted upright in FIG.
The d is substantially continuous with the curved rectifying plate 12a located at the most rear end position, thereby enabling a smooth turning of the jet flow.

The fact that fixing the lever 7 to the flap shaft 10 does not affect the removal is that the turning support shaft 9 is separately provided as described above, and the turning support shaft 9 can be attached to and detached 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.

The main significance of providing the curved cut portion 5d in the rearward extending portion of the side wall 5b is to enable the flap to transition from the laid state of FIG. 1 to the inclined standing state of FIG. . That is, since the flap shaft 10 is raised from the position shown in FIG. 1 to the position shown in FIG. 2 by the rotation of the lever 7 about the rotation support shaft 9, the flap shaft 10 is
This is to allow the lever 7 to rotate so as to move into the state of FIG. 1 from the state of FIG. 1 to the state of FIG. Another important significance is that the flap shaft 10 and the flap 11 are integrally fixed to the lever 7 because the flap shaft 10 is not pivotally supported on the side wall 5b unlike the conventional general structure. However, it is because these parts can be easily removed from the steering cylinder 5 by removing the rotation support shaft 9 supported by the side wall 5b. Further, the provision of the cut portion 5d also has the significance of contributing to weight reduction of the device.

When the hydraulic cylinder 6 is shortened when the ship is moving forward as shown in FIG. 1, the flap 11 is located on the curved type current plate 12 described below and fully opens the rear end opening of the steering cylinder 5. The jet stream is ejected straight rearward to generate forward thrust.

As shown in FIG. 2, when the ship is moving backward, the hydraulic cylinder 6 is extended and the lever 7 is tilted rearward, so that the flap 11 is tilted upright and the jet stream is prevented from jetting forward. The jet flow hitting the flap 11 is turned downward, and the curved current plate 12
It ejects in the forward direction of the ship, and the reaction force of the ship causes the ship to obtain reverse thrust.

[0028]

According to the first to fifth aspects of the present invention, since the intermediate portion of the lever is made rotatable by the pivot shaft supported on the side wall of the steering cylinder, the flap shaft is fixed to the lower end portion of the lever, and the flap shaft is fixed. Even if the flap is fixed to the shaft, it can be detached. As a result, the operating torque can be transmitted without the movement of the lever through the key or the spline, and the size of the flap shaft can be reduced, so that the weight is reduced. Since only the side wall is projected rearward, weight increase can be minimized.

In particular, according to the second aspect, only the side wall of the steering tube is projected rearward in a nose shape, and the pivotal support shaft is provided at the projecting end of the nose. Therefore, the weight increase due to the rearward extension of the side wall is suppressed as much as possible. be able to. Further, it becomes easy to form a cut portion for the flap shaft to enter.

Particularly, according to the third aspect, the flap shaft can smoothly transition to the standing state in which the flap is inclined without the flap shaft interfering with the side wall due to the notch.

In particular, according to the fourth aspect, the curved portion formed at the rear end of the lower surface plate of the flap and the curved straightening plate form a substantially continuous reverse flow path, whereby the reverse flow is smoothed and the reverse thrust is reduced. Improvement can be achieved.

In particular, according to claim 5, since the hydraulic cylinder and the like are located above the steering cylinder, they are not submerged in the seawater or exposed to the seawater surface even when the ship is stopped or at a low speed. Adhesion and the like are avoided, which contributes to improvement in the reliability of the device.

[Brief description of 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.

FIG. 2 is a longitudinal sectional view of a steering cylinder and the like including an ejection nozzle when the vehicle is traveling backward (in a state where the flap is tilted upright).

FIG. 3 is a front view of the steering cylinder and the like.

FIG. 4 is a front view of a conventional steering cylinder including a flap, an operating shaft, and a lever.

[Explanation of Codes] 1 ... Pump 2 ... Jet Nozzle 5 ... Steering Tube 5a ... (Steering Tube) Upper Wall 5b ... (Steering Tube) Side Wall 5c ... (Steering Tube Side Wall) Nose 6 ... Hydraulic Cylinder (Drive Device) 7 ... Lever 8 ... Bearing tube 9 ... Rotating support shaft 10 ... Flap shaft 11 ... Flap 11a ... Flap lower surface plate 11b ... Flap upper surface plate 11c ... Reinforcing rib 11d ... Curved portion 12 ... Curved straightening plate 13 ... Bridge

Claims (5)

[Claims] 1. A steering cylinder that is horizontally swingable is provided behind an ejection nozzle of a water jet propulsion machine, and a plurality of curved straightening vanes are arranged in a row at the bottom of the steering cylinder and tilted by the operation of a lever. In a water jet propulsion machine equipped with a flap that displaces between an upright state and a fallen state, only the side wall of the steering cylinder is made to project further rearward from the rear end position of the upper wall and is supported by the side wall at this protruding end. A dynamic support shaft is provided, the intermediate portion of the lever is attached to the rotary support shaft, and the flap shaft of the flap is fixed to the lower end of the lever extending a certain distance downward from the rotary support shaft. A reverse device for a water jet propulsion machine, which is equipped with a flap integrally. 2. The water according to claim 1, wherein only the side wall of the steering cylinder is further projecting rearward from the rear end position of the upper wall in a nose shape, and a pivot shaft is provided at the tip of the nose portion. Reverse device for jet propulsion machine. 3. The reverse device for a water jet propulsion device according to claim 2, wherein a cut portion is formed at a lower portion of the nose portion of the nose portion into which the flap shaft can enter in a standing state in which the flap is inclined. 4. A flap comprising an upper plate and a lower plate, and a reinforcing rib provided between the upper plate and the lower plate, and a flap shaft is disposed between the two at a rear end of the upper plate and the lower plate of the flap. The rear end of the face plate is curved, and a substantially continuous reverse flow path is formed between the curved portion and the curved straightening plate located at the rearmost end in the upright state in which the flap is inclined. The reversing device of the water jet propulsion device according to claim 1. 5. An upper portion of the lever is extended above the upper wall of the steering cylinder, a rod end of a hydraulic cylinder constituting a driving device is connected to an upper end of the lever, and a base of the hydraulic cylinder is moved from the upper wall of the steering cylinder. The reversing device for a water jet propulsion device according to any one of claims 1 to 4, wherein the water jet propulsion device is held by a bridge extending upward.