JPS6117920Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rope guard for a ship's propulsion shaft.

The propulsion shaft is exposed outside the vessel from the rear end of the stern tube to the end of the propeller boss, so for example, a part of the line thrown by a longline fishing boat during fishing may wrap around the propulsion shaft and damage the bearing. The bearing may be damaged because it blocks the drain of circulating lubricating water. For this reason, a rope guard has conventionally been provided for the purpose of protecting the exposed portion of the propulsion shaft.

FIG. 1 shows a conventional example. A rope guard consisting of a cylindrical cover 5, one end of which is attached to the end of the rear stern tube 2 by welding or the like, and the other end of which covers the propulsion shaft 4 from a distance with a gap provided between it and the outer periphery of the propeller boss 3. be. However, in the above-mentioned conventional example, the bearing part 6 and the propulsion shaft 4 are worn out during the voyage and the shaft center is lowered, so the propeller boss 3 is
The cover 5 is attached with a gap provided between the cover 5 and the outer periphery of the cover 5. For this reason, the rope passes through the gap and enters the space A, wraps around the propulsion shaft 4, and blocks the lubricant water drain hole at the outer end of the bearing 6, damaging the bearing.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a rope guard for a ship propulsion shaft which eliminates the drawbacks of the conventional techniques described above.

FIG. 2 shows an embodiment of the invention. The exposed portion of the propulsion shaft 4 is covered with a floating ring-shaped two-piece protection member 1 having a gap 13 between the propulsion shaft 4 and the propulsion shaft 4. That is, in the space A formed between the end of the rear stern tube 2 where the propulsion shaft 4 is exposed and the end of the propeller boss 3, a sleeve-shaped protective member 1 is installed so as to surround the exposed portion of the propulsion shaft 4. A gap 13 is provided between the drive shaft and the drive shaft 4, and the drive shaft is loosely fitted onto the drive shaft 4 so as to be able to idle. That is, the protective member 1
is supported so as not to be fixed to all members such as the propulsion shaft 4, the propeller boss 3, and the end 3 of the rear stern tube 2. The above-mentioned end portion etc. means that a part of the hull is included. With this configuration, ropes or the like will not be wrapped around the outer circumference of the protective member 1, so the lubricant water drain provided at the outer end of the bearing portion 6 will not be blocked, and the gap 13 will not be blocked. In particular, the protective member 1 acts as a waterway that releases the lubricating water that cooled the bearing part 6 to the outside.
There is no need to provide a water channel on the inner circumferential surface of the drive shaft, and even if the propulsion shaft 4 and the bearing part 6 wear out and the shaft center drops, the protection member 1 follows the displacement of the propulsion shaft 4, so there is no effect. do not have. A suitable material for the protective member 1 in this embodiment is an underwater bearing material such as phenolic resin.

FIG. 3 shows another embodiment of the present invention, which is a two-split ring-shaped protective member 1 having annular protrusions 7 and 8 at both ends, with a gap between the protective member 1 and the propulsion shaft 4. 13 is provided and is loosely fitted to the propulsion shaft 4 so that it can idle, and the protection member 1 and the annular protrusion 7 are
The structure covers the exposed part of the propulsion shaft 4 and the packing retaining plate 9, and the annular protrusion 8 on the rear side of the stern tube forms a labyrinth between the end of the rear part 2 of the stern tube and the bearing stopper plate 10, and the bearing It covers the stop plate 10. As a result, the area around which the rope or the like is wound is covered by the protective member 1, and even if the rope or the like tries to wrap around it, the protective member 1 will not accept the winding because it idles on the propulsion shaft 4. An appropriate number of axial grooves 11 are provided on the inner circumferential surface of the protective member 1 according to this embodiment, and an appropriate number of notched grooves 12 are provided on the annular protrusion 7 on the end side of the propeller boss 3, so that the bearing A water channel is formed for discharging lubricating water discharged from the section 6 to the outside.

With the above configuration, the lubricant water drain port is not blocked, and the gap 1 between the protection member 1 and the propulsion shaft 4 is
3, the axial groove 11 on the inner circumferential surface of the protective member 1, the notched groove 12 of the annular projection 7, etc., serve as waterways for discharging water to the outside of the ship. In the above embodiment, the protective member 1 has a two-piece structure, so it can be installed on an already built ship, and in the case of a newly built ship, an endless type protection member can be used without having a two-piece structure.

As described above, the present invention covers the exposed portion of the propulsion shaft 4 with the sleeve-shaped protective member 1 that is loosely fitted into the exposed portion so as to be freely rotatable, and the drain port provided at the outer end of the bearing portion 6 is immediately connected to Since the structure has a water channel between the inner circumferential surface of the protection member 1 and the propulsion shaft 4, a rope or the like will not be directly wrapped around the propulsion shaft 4, and the protection member 1
Since the protective member 1 idles due to the slip effect created by the gap 13 provided between it and the propulsion shaft 4, no rope or the like is wrapped around the outer periphery of the protection member 1, which has the effect of protecting the exposed portion of the propulsion shaft 4. It is something. Moreover,
The above-mentioned protective member has a simple structure and is extremely easy to manufacture and assemble, as there is no need to attach a knife to cut the rope or the like that is being wrapped around it, or to firmly fix it to the rear of the stern tube, etc. There are practical advantages such as

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional rope guard, and FIGS. 2 and 3 are sectional views of the rope guard of the present invention. DESCRIPTION OF SYMBOLS 1... Protective member, 2... Rear part of stern tube, 3... Propeller boss, 4... Propulsion shaft, 5... Cover, 6...
...Bearing part.

Claims (1)

[Scope of utility model registration request] In the space A formed between the end of the rear stern tube 2 where the propulsion shaft 4 is exposed and the end of the propeller boss 3, a sleeve-shaped protection member 1 is attached to the propulsion shaft 4 between this inner surface and the end of the propeller boss 3. Gap 13 between propulsion shaft 4
is provided and loosely fitted to surround the exposed portion, and the protective member 1 is provided with the propulsion shaft 4 and the propeller boss 3.
and a rope guard supported by the propulsion shaft so that it does not stick to any members such as the end of the rear part of the stern tube 2.