JPS5941194Y2 - Variable pitch propeller for ships - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a variable pitch propeller for ships in which the main propulsion device also functions as a stance thruster.

Currently, there is a tendency for variable pitch propellers to be frequently used as propellers as main propulsion devices in large ships.

However, conventional marine propellers, including those with variable pitch configurations, are long enough to provide thrust in the axial direction of the propeller. Side thrusters installed in appropriate positions on the hull of
At present, the desired movement is provided by an auxiliary propulsion device such as , or a Kort nozzle, or by external force such as a dugboat.

Therefore, as mentioned above, in vessels equipped with side thrusters, etc., the self-bladed blades enable turning movement in any direction and improve the maneuverability of the vessel, but on the other hand, the effective use of space inside the vessel is reduced. In addition, although a bow thruster may not be a problem for some ships, there are some ships where it is not possible to install a stern thruster due to space constraints, and when installing this type of special equipment, the ship weight, ship price, In addition, maintenance and operation costs will both increase.

This project was devised in view of the above points, and uses a variable pitch propeller as the main propulsion device.
The aim is to provide a convenient variable pitch propeller that combines the functions of a stance thruster by improving the propeller itself.

An embodiment of the present invention will be described below based on the drawings.

In the figure, 1 is a propeller shaft, 2 is a variable rod inserted into the axis of the propeller shaft 1 so as to be movable in the axial direction, and 3 is connected to the propeller shaft 1 via a shaft 4 provided at the base. A plurality of wings are rotatably attached, and each wing 3 has a shaft portion 4 at its base.
It is well known that a crank pin 5 is provided eccentrically in a protruding manner, the pin 5 is connected to a turning connecting member 6 provided on a turning rod 2, and the inclination angle of all wings 3 is changed simultaneously by the movement of the turning rod 2. It is similar to that of .

Reference numeral 7 denotes an operating mechanism for changing the pitch, and in the illustrated embodiment, the propeller shaft 1
A piston 9 directly connected to the end of the variable rod is slid into a cylinder 8 provided at one end, and the front and rear compartments 10.11 of the piston 9 are connected to a pressure oil supply source (
(not shown).

In the present invention, for at least one blade 3a, a connecting member 6a for variable movement connected to the crank pin 5a at the base of the blade is provided.
A movable body 1 installed so as to be able to independently reciprocate with respect to a variable rod 2
4, the movable body 14 is provided with a return spring 15, and the movable body 14 is connected to an independent hydraulic operating mechanism 16, and this hydraulic operating mechanism 16 is provided on the changeable rod 2. A piston 18 directly connected to the moving body 14 is slidably fitted into the cylinder 17, and the piston front chamber 19 is connected to an external pressure oil supply source (not shown) via a pressure oil supply passage 2o provided in the propeller shaft 1. It is.

Next, the effect of this proposal will be explained.

The supply of pressure oil to the hydraulic operating mechanism 16 of the present invention is controlled by the rotation of the propeller shaft 1.
Within a predetermined rotation angle range during rotation with zero force, the corresponding blade 3a
performs operations from the start of the pitch change to the return to the current state.

However, if we assume that in order to turn the ship to the right, a thrust force is required to the left relative to the stern, as shown in Figures 2 and 3.
As shown in the figure, when the pitch change operation is repeated while the corresponding wing rotates on the upper part of its virtual rotation locus, thrust in the direction of the solid line arrow is obtained, causing the hull to turn to the right.

On the other hand, when the hull turns to the left, thrust in the direction of the dashed arrow is obtained by repeating the pitch change operation while rotating the lower half.

As explained above, in the variable pitch propeller used for ships, the present invention is designed to change the pitch of at least one blade within the range of one rotation of the propeller shaft, in addition to the pitch change mechanism that changes the pitch of all the blades all at once. Since we have installed a hydraulic operation mechanism that repeatedly changes the pitch of the blades and returns them to their original state, in addition to obtaining thrust in the axial direction of the propeller by rotating the propeller as the main propulsion device, we can also use the stance thruster to turn the hull. It is possible to improve maneuverability when ships are stopped at ports, etc., and because of its configuration, it is not a particularly large piece of equipment and can be widely implemented regardless of the type of ship. Also, since this is only a slight improvement on the American propeller, it can eliminate drawbacks such as reducing the effective use space of the ship and increasing the weight of the ship. It is possible to eliminate the rudder, and the cost of the ship can be reduced in this respect.Although it has a simple structure, its practical effects are extremely significant.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic vertical sectional view of a propeller, and FIGS. 2 and 3 are explanatory diagrams of the operation. 1... Propeller shaft, 2... Flexible rod, 3
...Wing, 4...Shaft, 5...
Crank pin, 6... Connecting member for variable rotation, 7...
・・・･･･Cylinder, 9
... Piston, 10... Front chamber, 11.
... Rear chamber, 12, 13 ... Pressure oil supply passage, 14 ... Moving body, 15 ... Return spring, 16 ... Hydraulic operating mechanism, 17...
Cylinder, 18...Piston, 19...
- Front chamber, 20...pressure oil supply passage.

Claims (1)

[Scope of utility model registration request] It has a variable rod that reciprocates in the axial direction within the propeller shaft, and a crank pin provided at the base of each wing is connected to the variable rod via a variable connecting member, so that the pitch of all blades can be changed simultaneously. In a variable pitch propeller, a variable pitch connecting member for connecting at least one blade with a crank pin at the base of the blade is provided on a movable body that is installed to be able to independently reciprocate with respect to a variable pitch rod, and is characterized in that a return spring is interposed, the movable body is connected to an independent hydraulic operating mechanism, and the hydraulic operating mechanism is connected to an external pressure oil supply source via a pressure oil supply passage provided on the propeller shaft. Variable pitch propeller for ships.