JPH058236Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for preventing foreign matter from being caught in a marine propeller shaft.

(Prior technology) For marine propeller shafts, ships that use oil-lubricated stern tube bearings are equipped with a shaft sealing device, and ships that use seawater-lubricated stern tube bearings are equipped with a seal holder to prevent seawater from entering. has been done.

Therefore, damage to this part can lead to leakage of lubricating oil in the stern tube and rusting of the shaft due to the intrusion of seawater, resulting in serious damage.

From this point of view, a foreign matter entrainment prevention device has been proposed in Japanese Utility Model Application Publication No. 59-156897.

That is, as shown in FIG. 3, in this prior art, a cylindrical guard 1 is attached to a stern frame boss 3 on the hull side surrounding a propeller shaft 5, and this guard 1 is fitted around the propeller shaft 5. By extending toward the boss 2 of the propeller attached to the propeller, it protects the oil-lubricated bearing and the shaft sealing means 4 of the shaft sealing device. The foreign matter is prevented from being sucked into the guard 1 by the reflector 7 having the curvature 6.

(Problems to be solved by the invention) Although the conventional techniques are recognized to have some degree of usefulness, the following problems remain.

With conventional technology, reflectors (rope return)
7 is attached to the front end of propeller boss 2,
The result is the same as if the outer diameter of the propeller boss 2 were increased.

Generally, as the outer diameter of the propeller boss 2 becomes larger, the propeller efficiency decreases.
Mounting the reflector 7 on the outer diameter of the propeller boss 2 is disadvantageous in these days when energy saving effects are pursued.

Since this reflector 7 is installed to prevent ropes such as fishing nets from getting entangled in the propeller shaft 5, it must have a height of at least a certain value (at least 30 mm) regardless of the size of the outer diameter of the propeller boss 2. It is. The higher the height, the more effective it is in preventing rope entanglement, but it cannot be made too high from the viewpoint of propeller efficiency. As an example, if a reflector 7 with a minimum height of 30 mm is attached to a propeller boss outer diameter of 600 mm (propeller shaft diameter approximately 330 mm), the boss diameter is 10 mm.
It will be the same as the one increased by %. This tendency becomes more pronounced for smaller boss diameters.

In the prior art, the reflector 7 is attached to the outer circumferential side of the reflector 7, so it is heavy.

Furthermore, in the conventional technology, the reflector 7 to be attached
It is necessary to increase the inner diameter of the rope guard 1 according to the height of the propeller, which also becomes a factor in reducing propeller efficiency.

The object of the present invention is to maintain the advantages of the prior art proposed above while eliminating the drawbacks thereof.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object are characterized by a cylindrical guard 1 attached to the hull side of the stern frame boss 11, etc.
0 surrounds the propeller shaft 16 and extends toward the propeller boss 17 attached to the shaft 16, and is sucked into the guard 10 through a gap 18 formed between the propeller boss 17 and the guard 10. A reflector 22 is attached to the propeller boss 17 side to prevent foreign matter from entering, and a fitting part 19, 1 is provided on the front end surface 20 of the propeller boss 17 and continuous in the circumferential direction surrounding the propeller shaft 16.
9' is formed, and the reflector 22 is formed into an L-shaped cross section by an axially extending portion 24 and a rising wall 25 projecting radially outward from one axial end of the portion 24, The other axial end of the portion 24 is connected to the fitting portions 19, 19'.
The spigot is fitted into the spigot to fasten the spigot fitting part, and the front end surface 20 of the propeller boss 17 and the rising wall 25 of the reflector 22 are made to face each other in the axial direction to form a recess 27 with the extending portion 24 as the bottom. However, the extended end of the guard 10 is fitted onto the outer periphery of the rising wall 25 with a gap 26 interposed therebetween.

(Function) Foreign matter that has grown around the propeller boss 17 is sucked radially inward via the outer periphery of the front end of the boss.

The foreign matter that has been sucked in is received by the axially extending portion 24 of the reflector 22, and is also sucked in the radial direction and reduced in diameter, so that the entanglement is partially relieved.

Even if a strong force is applied to the reflector 22 by wrapping around the stretched portion 24 again, the reflector 22
By fitting the proximal end into the fitting groove 19 or the receiving shelf 19' with a spigot, bending or warping of the extending portion 24, direct tightening force acting on the bolt 23, etc. are prevented, and the rising wall Guard 10 by 25
Intrusion inside is prevented.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG. 2A.

In the figure, 10 is a cylindrical guard, one end of which is attached to the hull side of the stern frame boss 11, etc., and includes a bearing 12, a shaft sealing device 13, and a sleeve 14.
It surrounds the propeller shaft 16 including a shaft sealing means 15 consisting of, etc.

Reference numeral 17 denotes a propeller boss, which is fitted onto the propeller shaft 16 and attached with a key or the like. A gap 18 is provided between the two and in the axial direction.

Reference numeral 19 denotes a fitting groove, which is continuous with the front end surface 20 of the propeller boss 17 in the circumferential direction and is recessed in the axial direction.

That is, it is formed circumferentially surrounding the propeller shaft 16, and the groove bottom has female screw holes 21 in the axial direction at predetermined intervals in the circumferential direction.

Reference numeral 22 denotes a reflector, which has a ring shape with an L-shaped cross section, and its base end is fitted into the fitting groove 19 with a spigot, and it is attached by screwing a bolt 23 into the female threaded hole 21. part 2
4 extends in the axial direction toward the hull side, and is an extended portion 24
A recess 27 is formed on the extending end side of the propeller by making the rising wall 25 and the front end surface 20 of the propeller boss 17 face each other in the axial direction, and having the extending portion 24 as the bottom for dropping a rope or the like into it. There is. Further, the guard 10 is fitted onto the outer peripheral surface of the rising wall 25 with a gap 26 interposed therebetween.

Although the reflector 22 may be a ring that is integral in the circumferential direction, a ring that is divided in the radial direction is desirable in order to facilitate assembly and disassembly.

Additionally, in the figure, reference numeral a indicates a gap between the outer circumferential surface of the rising wall 25 and the outer circumferential surface of the propeller boss 17, and the gap 26 is usually about 10 to 15 mm.

Incidentally, FIG. 2B shows a modification of the present invention in which a reflector receiving shelf 19' is provided.

(Effect of the invention) According to the invention, the cylindrical guard 10 attached to the hull side of the stern frame boss 11 and the like surrounds the propeller shaft 16 and extends toward the propeller boss 17 attached to the shaft 16. The propeller boss 17 is equipped with a reflector 22 that prevents foreign matter from entering the guard 10 through the gap 18 formed between the propeller boss 17 and the guard 10.
Since it is attached to the side, it prevents foreign matter from entering the guard 10 through the gap 18, preventing damage to the propeller shaft, leakage of lubricating oil in the stern tube, etc.
In addition to the basic effects of not only preventing rust on the shaft due to the intrusion of seawater, but also preventing damage to fishing nets, etc., it has the following unique effects.

That is, on the front end surface 20 of the propeller boss 17,
Fitting portions 19 and 19' are formed that are continuous in the circumferential direction surrounding the propeller shaft 16, and the axially extending portion 2
4 and a rising wall 25 projecting radially outward from one axial end of the portion 24, the reflector 22 is formed into an L-shape in cross section, and the other axial end of the extending portion 24 of the reflector 22 is fitted. Part 1
9, 19' and fasten the pilot fitting portion, and the front end surface 2 of the propeller boss 17.
0 and a rising wall 25 of the reflector 22 are made to face each other in the axial direction to form a recess 27 with the extending portion 24 as the bottom, and the extending end of the guard 10 is formed on the outer periphery of the rising wall 25 through a gap 26. Because it is fitted, regardless of the outer diameter of the propeller boss 17,
Depending on the depth of the recess 27, the reflector 22
It is sufficient to secure an amount corresponding to the height, and in order to make the rope entanglement prevention function more effective, a dimension “a” from the outer diameter of the propeller boss 17 is secured.
Although it is made larger, this "a" dimension only needs to be about 5 to 10 mm, so it hardly affects the energy saving effect.

There is no need to change the inner diameter of the rope guard 10 at all, and the length can be left as it is, or it can be shortened depending on the length in the axial direction of the reflector 22 that forms the trapping prevention groove, that is, the recess 27. You can also.

Furthermore, a reflector 22 is attached to form a recess 27, thereby facilitating the diameter reduction of the foreign object and actively dismantling it.

Even if a diameter-reduced foreign object wraps around the reflector 22, its base end is fitted into the fitting groove 19 with a spigot, so it will not break or warp, resulting in durability. Further, since no direct tightening force is applied to the bolt 23, the bolt only needs to have a small diameter.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the present embodiment, FIGS. 2A and 2B are enlarged sectional views of the same, and FIG. 3 is a sectional view of the conventional example. 10... Guard, 11... Stun frame boss, 15... Shaft sealing means, 16... Propeller shaft, 1
7... Propeller boss, 19... Fitting groove, 22...
Reflector, 23...volts.

Claims (1)

[Claims for Utility Model Registration] A cylindrical guard 10 attached to the hull side of a stern frame boss 11, etc. surrounds a propeller shaft 16 and extends toward a propeller boss 17 attached to the shaft 16, and , in which a reflector 22 is attached to the propeller boss 17 side to prevent foreign matter from entering the guard 10 through a gap 18 formed between the propeller boss 17 and the guard 10, the front end of the propeller boss 17 A fitting portion 19,1 continuous in the circumferential direction surrounding the propeller shaft 16 is provided on the surface 20.
9' is formed, and the reflector 22 is formed into an L-shaped cross section by an axially extending portion 24 and a rising wall 25 projecting radially outward from one axial end of the portion 24, The other axial end of the portion 24 is connected to the fitting portions 19, 19'.
The spigot is fitted into the spigot to fasten the spigot fitting part, and the front end surface 20 of the propeller boss 17 and the rising wall 25 of the reflector 22 are made to face each other in the axial direction to form a recess 27 with the extending portion 24 as the bottom. The device for preventing foreign matter from being caught in a marine propeller shaft is characterized in that the extending end of the guard 10 is fitted onto the outer periphery of the rising wall 25 via a gap 26.