JPH0230920B2 - HAKUYOPUROPERASOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marine propeller device, and more particularly to a marine propeller device in which the pitch angle and rake angle of each propeller blade can be adjusted.

Conventionally, variable pitch propeller systems used on ships have been designed to control the thrust generated by each propeller blade while keeping the rotational speed of the propeller shaft constant when the ship is moving forward or backward. The structure allows the pitch angle to be changed all at once.

That is, in the conventional type, as shown in FIG. 1, in the propeller P, the blade angle a ₀ of each propeller blade is
are always identical to each other.

Therefore, if the flow velocity flowing into each propeller blade is the same, among the fluid forces acting on each propeller blade, the thrust force f ₁ , which is the force in the longitudinal direction of the ship S, and the force f ₂ in the circumferential direction of the propeller blade are , are equal for each propeller blade.

The lateral force acting on the hull S is the sum of the lateral component f ₃ of the circumferential force f ₂ for each propeller blade. Normally, the added value of this lateral force is approximately zero, and no turning motion of the hull S is induced.

For this reason, conventionally, a rudder R was provided behind the propeller device, and a lateral force was generated in the rudder R by adjusting the rudder angle b ₀ to induce a turning motion of the ship body S.

However, with such a turning means using the rudder R, there is a problem in that the ship's speed is reduced due to the rudder resistance, and it is also impossible or difficult to induce a turning movement during low-speed navigation such as when berthed or when the ship is stopped. Another problem was that an auxiliary device such as a side thruster was required in addition to the rudder R.

The present invention aims to solve these problems, and aims to provide a marine propeller device that enables ship maneuvering using only the propeller device without the need for rudders, side thrusters, etc. purpose.

For this reason, the marine propeller device of the present invention includes a plurality of propeller blades pivotally connected to a propeller shaft, and a rake angle adjustment mechanism and a pitch angle adjustment mechanism that adjust the rake angle and pitch angle of the propeller blades, respectively. The present invention is characterized in that a steering means is provided which can periodically change the pitch angle of the propeller blades in accordance with the amount of vessel maneuvering control when the propeller blades rotate.

A marine propeller device as an embodiment of the present invention will be explained below with reference to the drawings. Figures 2 to 8 show a marine propeller device having four propeller blades, and Figure 2 is a perspective view thereof; Fig. 3 is a perspective view showing the state in which the rake angle of the propeller blade is changed, Fig. 4 is a perspective view showing the pitch angle adjustment mechanism and rake angle adjustment mechanism of the propeller blade, and Fig. 5 is a perspective view of the propeller blade. Figure 6 is a block diagram showing the ship maneuvering control system, Figure 7 is a perspective view showing the effect when the rake angle is adjusted to 90 degrees, Figure 8 is the rake angle. It is a perspective view showing the effect when the propeller shaft 2 is adjusted to 180 degrees, and four propeller blades 1a, 1b, 1
c and 1d are pivotally mounted.

As a rake angle adjustment mechanism and a pitch angle adjustment mechanism for adjusting the rake angle and pitch angle of the propeller blades 1a, 1b, 1c, and 1d, respectively, a propeller blade is provided at the base end of the propeller blades 1a, 1b, 1c, and 1d. The shaft 4 is bent as shown in FIGS. 4 and 5, and at its tip there is a lever 5 extending in a direction intersecting the center line of the propeller blade shaft 4.
is fixedly installed, and rods 6, 6 are pivotally connected to both ends of the lever 5 via hinges 7, 7.

The root of the propeller blade 1 is formed into a spherical shape as a ball joint part 3, and as shown in FIG. 5, this ball joint part 3 engages with a guide part formed on the propeller shaft 2 to propel the propeller A blade 1 is pivoted to a propeller shaft 2.

Incidentally, so that the rake angle of the propeller blade 1 can be changed without any trouble, a cut groove is formed in the propeller shaft 2 so as to be able to engage with the root of the propeller blade 1 and the propeller blade shaft 4. (See FIG. 5) Further, as a steering means for controlling ship maneuvering, as shown in FIG. 6, an actuator is connected to a steering wheel operated by a ship operator via a controller.

This actuator has propeller blades 1a, 1
The pitch angles a ₁ , a ₂ , a ₃ , and a ₄ of b, 1c, and 1d are changed periodically according to their respective rotational positions, and in order to change the rake angle c, for example, a swash plate cam mechanism and hydraulic pressure are used. It is made up of a combination of cylinders, and is connected to the other ends of the rods 6, 6, and the pitch angle is adjusted by pushing out one of the rods 6, 6 and pulling in the other, and extruding both together. The rake angle can be adjusted by pulling in or out.

With the above configuration, in order to generate a lateral thrust that induces a turning motion in the hull S during normal sailing, the actuator is controlled by the steering wheel to drive the rake angle adjustment mechanism and the pitch angle adjustment mechanism, and the seventh As shown in the figure, the rake angle c of the propeller blade 1 is maintained at 90 degrees.

Further, for example, in the upper part of the propeller (the position of the propeller blade 1a in the figure), the pitch angle is set to a ₁ where neither lateral force nor thrust force is generated, and in the lower part of the propeller (the position of the propeller blade 1c in the figure), the normal lateral force f _2C , thrust f _1C
Let the pitch angle that occurs be a ₃ .

At that time, the resultant force of the lateral forces generated by the propeller blades 1a, 1b, 1c, and 1d does not become zero, and the hull S
This induces a turning movement, making it possible to maneuver the ship.

In addition, in order to induce a turning movement in the hull S or move it in the width direction when the ship is stopped, the eighth
As shown in the figure, set the rake angle c of propeller blade 1 to 180
degree.

In this case, propeller blades 1a, 1b, 1c, 1d
does not generate forward thrust, and the propeller lateral force F ₁
and only the component force F ₂ perpendicular to it is generated.

Therefore, propeller blades 1a, 1b, 1c, 1d
If the pitch angles a ₁ , a ₂ , a ₃ , and a ₄ of the propeller are changed according to their rotational positions, and the lateral force is generated by the propeller as a whole, only the propeller lateral force can be generated without generating a force in the longitudinal direction. This makes it possible to cause the hull S to move in the width direction or turn without moving the hull S forward or backward.

Furthermore, by changing the rake angle c between 90 degrees and 180 degrees, and by changing the way the pitch angles a ₁ , a ₂ , a ₃ , and a ₄ change with the rotation of the propeller blade 1, the propeller lateral The power and propeller thrust (including negative force) can be adjusted to any desired magnitude, making it possible to efficiently maneuver the ship even when cruising at low speed or when going astern.

As described above in detail, the marine propeller device of the present invention includes a plurality of propeller blades pivotally connected to a propeller shaft, a rake angle adjustment mechanism for adjusting the rake angle and pitch angle of the propeller blades, and a pitch angle adjustment mechanism for adjusting the rake angle and pitch angle of the propeller blades. The simple configuration includes a steering means that can periodically change the pitch angle of the propeller blades according to the amount of ship maneuvering control when the propeller blades rotate, and is equipped with a steering means that can be used to control ships' maneuvering devices such as rudders and side thrusters. Using only a propeller system without the need for a rudder, the ship can be easily maneuvered not only during normal cruising, but also when cruising at low speed, stopping, or going astern. Since no plates are used, the advantage is that the resistance to the hull during navigation can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional marine propeller device, and FIGS. 2 to 8 show a marine propeller device as an embodiment of the present invention. FIG. 2 is a perspective view thereof, and FIG. FIG. 4 is a perspective view showing the pitch angle adjustment mechanism and rake angle adjustment mechanism of the propeller blade, and FIG. 5 is a perspective view showing the state in which the rake angle of the propeller blade is changed. 6 is a block diagram showing the ship maneuvering control system, and 7 is a sectional view showing the installed state.
FIG. 8 is a perspective view showing the effect when the rake angle is adjusted to 180 degrees. 1a, 1b, 1c, 1d... propeller blades, 2...
...Propeller shaft, 3...Propeller blade ball joint, 4...
...Propeller blade shaft, 5...Lever, 6...Rod,
7... Hinge, S... Hull, a ₁ , a ₂ , a ₃ , a ₄ ...
Pitch angle, c...Rake angle, L...Hull center line.

Claims (1)

[Claims] 1 A plurality of propeller blades pivotally connected to a propeller shaft, and a rake angle adjustment mechanism and a pitch angle adjustment mechanism that respectively adjust the rake angle and pitch angle of the propeller blades, and when the propeller blades rotate, the propeller blades are rotated. A marine propeller device, characterized in that it is provided with a steering means that can periodically change a pitch angle according to a ship maneuvering control amount.