JPH058237Y2 - - 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, in this conventional example 1, as shown in FIG. By extending toward the boss 2 of the propeller that is fitted and attached to the shaft, it is made to guard the oil-lubricated bearing and the shaft sealing means 4 of the shaft sealing device, and it grows and wraps around the boss 2. Foreign objects such as ropes and fishing nets should be
A reflector 7 having a warp 6 prevents the rope from being sucked into the rope guard 1 through the gap 8.

FIG. 4 shows conventional example 2, in which a circumferential groove 9 for reducing the diameter of foreign matter is formed on the outer circumferential surface of the propeller boss 2 to connect the warp 6 of the reflector 7 and the groove wall of the circumferential groove 9. It is something.

Furthermore, FIG. 5 shows conventional example 3, in which the circumferential groove 9
In addition, a reflector 7 is formed integrally with the propeller boss 2 itself.

(Problems to be Solved by the Invention) Conventional Examples 1 to 3 each have their own usefulness, but they have the following common problems.

1. There are only two barriers to preventing rope entanglement: the rope guard and the reflector.

2 Also, since the reflector 7 is attached to the outer circumference of the propeller boss, the result will be the same as if the outer diameter of the boss had been increased, resulting in a decrease in propeller efficiency and the possibility of creating a reverse taper that is difficult to manufacture rope guards. It was expensive.

Therefore, the inventors of the present invention have previously proposed a device for preventing foreign matter from being entrained as shown in Fig. 6.
No. 124235).

That is, as only the main part is shown in FIG. 6, a reflector receiving shelf 10 that is continuous on the circumference is provided on the front end surface 2A of the propeller boss 2 and protrudes in the axial direction, and the reflector is provided with a groove having an L-shaped cross section. Consisting of metal fittings 11,
The metal fitting 11 is removably attached to the front end surface 2A with bolts 12, and has a portion 11A that extends in the axial direction from the attachment portion toward the hull side, and a radially outward direction on the extending end side of this extended portion 11A. The rope guard 1 has a rising wall 11B projecting from above, and the extending end of the rope guard 1 is fitted onto the outer periphery of the rising wall 11B via a gap 8.

According to the configuration shown in FIG. 6, although the above-mentioned drawbacks are eliminated, the length of the grooved metal fitting 11 is inevitably increased in order to secure the space for the groove 9A.
Therefore, the weight of the grooved metal fitting 11 itself increases, and the centrifugal force applied to the tightening bolt 12 also increases, which is disadvantageous.

The purpose of this invention is to solve all the problems of description.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object are characterized by a cylindrical rope guard 20 attached to the hull side of the stern frame boss 21, etc. The rope guard 20 surrounds the propeller shaft 26 and extends toward the propeller boss 27 attached to the shaft 26, and the propeller boss 27 and the rope guard 20
A reflector 31 having a curvature 32 that prevents foreign matter from entering the rope guard 20 through a gap 36 formed between the propeller boss 2 and the propeller boss 2
For those installed on the 7 side, propeller boss 27
On the radially outer side of the front end surface 28 of
A reflector 31 is attached to the front end surface 28 of the propeller boss 27 so that 2 and the rising wall 29A face each other in the axial direction.
is attached to form a circumferential diameter reducing groove 35, and the extending edge 20A of the rope guard 20 is connected to the rising wall 2.
The gap 36 is formed at a midway point in the axial direction between the curve 9A and the warp 32.

(Function) Foreign matter that grows around the outer peripheral surface of the boss 27 during rotation of the propeller is first blocked from entering in the radial direction by the extended end edge 20A of the rope guard 20 as a first barrier.

However, the extending edge 20A of the rope guard 20 and the radial rising wall 29 of the propeller boss 27
Since there is normally a gap 36 of 10 to 15 mm between the cable and the cable A, a thin rope such as a fishing net may be sucked into the radial direction through this gap 36.

When the foreign matter is sucked radially inward through the gap 36, the diameter of the wound foreign matter is reduced, so that the entanglement is partially relieved.

The rope that has passed through the gap 36 is wound around the second barrier, the circumferential groove 35, where it is prevented from entering, but the groove bottom of the circumferential groove 35 is substantially Therefore, even if it is wrapped around the shelf portion 29 and a strong force is applied, there will be no problem.

Furthermore, although there is a limit to the amount of rope that can be wound around the circumferential groove 35, the rope guard 20 prevents the rope from entering in excess of the groove space. Even if this groove becomes full with the wrapped rope, the reflector 31 and rope guard 20
The gap 37 between the shaft sealing means 25 and the shaft sealing means 25 serves as a third barrier to prevent the rope from entering the shaft sealing means 25.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2.

In FIG. 1, 20 is a cylindrical guard;
One end of the propeller shaft 2 is attached to the hull side of the stern frame boss 21, etc., and includes a shaft sealing means 25 consisting of a bearing 22, a shaft sealing device 23, a sleeve 24, etc.
It surrounds 6.

A propeller boss 27 is fitted onto the propeller shaft 26 and attached with a key or the like, and the other end of the guard 20 extends toward the boss 27.

An axial shelf portion 29 and a radial rising wall 29 are provided on the radially outer side of the front end surface 28 of the propeller boss 27.
A notch having an L-shaped cross section is formed, and axial screw holes 30 are formed in the front end surface 28 at intervals in the circumferential direction.

31 is a reflector, a warp 32 and a vertical wall 3
3, the warp 32 and the rising wall 29A
It is attached to the front end surface 28 by tightening the mounting bolt 34 into the screw hole 30 with the two facing each other in the axial direction, and in this attached state, the warpage 32
protrudes in the radially outward direction with a tapered surface, and a diameter reducing circumferential groove 35 is provided around the entire circumference of the propeller bolt 27 on the front end surface 28 side.

The reflector 31 may have a ring shape that is integral in the circumferential direction, or it may be split in the radial direction and formed into a ring shape in the attached state, but preferably, it is split. It is easy to assemble and disassemble.

The guard 20 is extended toward the propeller boss 27, and its extended edge 20A is connected to the upright wall 29.
A gap 36 is formed between the rising wall 29A and the axially intermediate portion of the warp 32, and the gap 36 serves as a first barrier to foreign matter intrusion, and the circumferential groove 35 serves as a second barrier. Furthermore, a gap 37 between the inner circumferential surface of the guard and the outer circumferential surface of the reflector is defined as a third barrier.

The extended edge 20A of the guard 20 is formed with an obstacle wall 38 that protrudes radially inward as shown by the chain line in FIG. 1, so that the circumferential groove 29 has a labyrinth shape to further prevent foreign matter from entering. can contribute to

(Effect of the invention) According to the invention, the front end surface 2 of the propeller boss 27
8, a shelf 29 continuous on the circumference is recessed in the axial direction, and the warp 32 of the reflector 31 is recessed in the shelf 29.
The reflector 31 is attached to the propeller boss 2 in correspondence with the side.
Since the diameter reducing circumferential groove 35 is attached to the front end surface 28 of the propeller boss 27, foreign matter that grows around the propeller boss 27 and tries to enter is subjected to a diameter reducing action in the circumferential groove 35, and the entanglement is prevented. can be relieved.

Further, in order to form the diameter reducing circumferential groove 35, instead of extending the reflector 31 in the axial direction, the shelf portion 29 is formed by notching the reflector 31 in the axial direction on the radial side of the propeller boss 27.
Because the reflector 31 is formed with a
8, the load on the bolt 34 can be suppressed and durability is improved.

Furthermore, since the extended end edge 20A of the rope guard 20 is inserted into the groove width portion of the diameter reducing groove 35, the gap 36 between the extended end edge 20A and the groove rising wall 29A, and the circumferential groove 35 and rope guard 2
The three barriers formed by the gap 37 between the inner circumferential surface of the reflector 31 and the outer circumferential surface of the reflector 31 can reliably prevent the intrusion of foreign substances.Moreover, the structural shape of the conventional rope guard 20 is not changed, and the rope guard 20 can be actively used. By utilizing the reflector 31, the effectiveness of the reflector 31 during rope winding is enhanced and safety becomes greater.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention and a conventional example. Fig. 1 is an enlarged cross-sectional view of the main part of the embodiment of the present invention, Fig. 2 is a sectional view of the overall structure, and Figs. 3 to 6 are conventional examples 1 to 6. 4
FIG. 20... Rope guard, 21... Stan frame boss, 26... Propeller shaft, 27... Propeller boss, 28... Front end surface, 29... Shelf, 31...
Reflector, 32... Warp, 35... Circumferential groove, 36
……gap.

Claims (1)

[Claims for Utility Model Registration] A propeller boss 2 in which a cylindrical rope guard 20 attached to the hull side of a stern frame boss 21, etc. surrounds a propeller shaft 26 and is attached to the shaft 26.
A gap 36 extending toward 7 and formed between the propeller boss 27 and the rope guard 20
A reflector 31 having a curvature 32 that prevents foreign matter from entering the rope guard 20 through the reflector 31.
is attached to the propeller boss 27 side, a notch having an L-shaped cross section consisting of an axial shelf portion 29 and a radial rising wall 29A is formed on the radially outer side of the front end surface 28 side of the propeller boss 27, Warpage 32 of the reflector 31 and the rising wall 29A
A reflector 31 is attached to the front end surface 28 of the propeller boss 27 so as to face each other in the axial direction.
5, and the extending edge 2 of the rope guard 20
A foreign matter entrainment prevention device in a marine propeller shaft, characterized in that the gap 36 is formed by locating the gap 36 in the axial direction midway between the rising wall 29A and the warp 32.