JPS6024718Y2 - Device to prevent rope from wrapping around propeller shaft - Google Patents

Description

[Detailed description of the invention] This invention is a rope winding system that is installed between the stern frame boss part and the propeller boss part of a ship to prevent ropes and similar string-like members from being wrapped directly around the propeller shaft. This invention relates to a sticking prevention device.

In general ships that use propellers (screws) as propulsion devices, fishing nets and other underwater or floating ropes and similar string-like members (hereinafter collectively referred to as ropes) are hooked onto the propeller and wound around the propeller shaft. It may stick.

This wrapping of the rope not only reduces the propulsion force, but also, for ships whose propeller shafts are lubricated with seawater,
This inhibits lubrication, causing abnormal wear of lignum vitrees and rubber bearings, and in extreme cases can make navigation impossible.

Conventionally, as soon as a rope is wrapped around the propeller shaft, a sailor goes into the sea and cuts the wrapped rope, but this takes time, and depending on the weather, temperature, and other conditions, it may be difficult to cut the rope. There may be great danger involved.

For this reason, a cutting blade is placed on the outer periphery of the propeller shaft to cut the rope using the winding force of the rope itself that wraps around the propeller shaft, or a rope guard is placed around the propeller shaft to cut the rope. It has been considered to prevent direct winding around the shaft, but the former method relies on the rope's own winding force to cut the rope, making it difficult to cut the rope reliably, and the latter method Because a small gap is provided between the rope guard and the propeller boss to prevent radial and axial movement of the propeller shaft, the rope often ends up being forced to pass through this gap and wrap around the propeller shaft. , neither of which is very complete.

In view of the above circumstances, the inventors of the present invention previously filed a utility model registration application No. 181555 (Showa 5 Tsubo) as a rope wrapping prevention device that can completely prevent rope wrapping. A ring-shaped guide ring is provided on either the end of the rope guard facing the propeller boss and the propeller boss, and an annular elastic body is provided on the other end, and the guide ring and the elastic body are brought into contact with each other. We have provided a device to prevent ropes from winding around propeller shafts, and have achieved excellent results.

However, even with the rope wrapping prevention device of the prior application, when it is applied to a large ship with a large hull (500 tons or more), the following problems may occur.

In other words, as ships become larger, the number of intermediate shafts connected to the propeller propulsion shaft inevitably increases.

When the ship is sailing, the intermediate shafts thermally expand due to the operating heat of the engine and the frictional heat of the bearings, and their length increases, and the extension of each intermediate shaft is concentrated in both directions.

As a result, the distance between the stern frame boss and the propeller boss becomes considerably wider than when the engine is stopped.

When the distance between the stern frame host and the propeller boss increases in this way, the abutting surfaces between the annular guide link and the annular elastic body become separated, which causes the rope to wrap around the propeller shaft through this gap. This is because it occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rope wrapping prevention device that can completely prevent a rope from directly wrapping around a propeller shaft for a large ship, which solves the above-mentioned drawbacks.

The present invention will be explained in detail below based on the drawings.

Figures 1 and 2 show an embodiment of this invention.
is the hull.

A stern frame boss 2 is provided at the tail of the hull 1, as is customary, to rotatably support a propeller shaft 3 and to which a truncated conical rope guard 4 is fixed.

As is well known, the rope guard 4 is provided concentrically surrounding the propeller shaft 3 and prevents the rope from directly wrapping around the propeller shaft 3. The free end is positioned at the part shown in FIG.

Reference numeral 7 denotes a bracket fixed to the outer peripheral surface of the rope guard 4 by means such as welding, and is fixed to the protruding piece 8 of the stun frame boss portion 2 with a fixing bolt 9 to secure the rope guard 4 to the stun frame boss portion 2. Strengthens adhesion.

An annular stopper 10 is fixed to the free end of the rope guard 4 around the propeller shaft 3 by means such as welding.

This stopper 10 is formed with a fastening groove 11 that opens in the direction of the central axis along its periphery. An elastic body 12 consisting of is fixed by means of adhesive or bolting.

The rear surface (rear vertical surface) 12e of the base 12a on the center side of the elastic body 12 and the end surface (front vertical surface) 12c of the cylindrical portion 12b outside this rear surface 12e are perpendicular to (perpendicular to) the propeller shaft 3, and Parallel (horizontal) to the propeller axis 3 of the cylindrical part 12b
They are formed concentrically with an inner circumferential surface (horizontal inner surface) 12d interposed therebetween.

On the other hand, a guide ring 13 consisting of a base portion 13a and a cylindrical portion 13b, centered around the propeller shaft 3, is attached to the propeller boss portion 5 by a fixing bolt 14 so as to face the elastic body 12.

The end surface (
front vertical surface) 13e and the base 1 outside this end surface 13e.
The front surface (rear vertical surface) 13c of the cylindrical portion 13b is perpendicular (perpendicular) to the propeller shaft 3, and parallel to the propeller shaft 3 of the cylindrical portion 13b (
They are formed concentrically through a horizontal outer circumferential surface (horizontal outer surface) 13d.

The cylindrical portions 12b and 13b of the elastic body 12 and the guide ring 13 are coaxially fitted to the propeller shaft 3, and the end surface 12c of the cylindrical portion 12b of the elastic body 12 is connected to the guide ring 13. Front surface 13c of base 13a
The inner circumferential surface 12d of the cylindrical portion 12b is in contact with the outer circumferential surface 13d of the cylindrical portion 13b, and the rear surface 12e of the base portion 12a is in contact with the end surface 13e of the cylindrical portion 13b.

Note that 15 is a water intake hole bored in the rope guard 4, and is covered with a cover 15a that is open on one side.

16 is a protective zinc fixed inside the rope guard 4.

In the above configuration, before the engine moves or immediately after the engine starts when the intermediate shaft has little thermal expansion, the guide ring 13 and the elastic body 12 are connected to the front surface 13c and the end surface 12c.
While contacting each other at the contact surfaces of the outer peripheral surface 13d and the inner peripheral surface 12d, and the contact surfaces of the end surface 13e and the rear surface 12e,
It rotates relative to the propeller shaft 3 as it rotates.

Next, even when the distance between the stern frame section 2 and the propeller boss section 5 is widened due to thermal expansion of the intermediate shaft after the engine warms up, the guide ring 13 remains on the outer circumferential surface 13d1 of the cylindrical section of the elastic cylinder. The portion 12b rotates together with the propeller shaft 3 while being in contact with the contact surface of the inner circumferential surface 12d.

Therefore, regardless of the operating state of the engine, even if the rope wraps around the rope guard 4 or the propeller (not shown) and comes to the free end of the rope guard and the propeller boss, the elastic body 12 It will not get into the inside of the rope guard 4 due to obstruction.

FIG. 3 shows another embodiment of this invention, in which the wrapping prevention device is fixed to the free end of the rope guard 4 @1
1 is fixed by means such as welding, and an elastic body 12 having a cylindrical portion 12b is fixed to the fixing groove 11 around the propeller shaft 3.

On the other hand, the propeller boss part 5 has a water stop rubber ring 17,
An annular gland 18 for fixing this is attached with a fixing port 14.

The other parts of this example are the same as those in FIG. 1, so the same reference numerals are given and the explanation thereof will be omitted.

In this example, a gland 18 fixed to the propeller boss 5 is connected to an elastic body 12 fixed to the rope guard 4.
However, in this example as well, the elastic body 12 and the gland 18 rotate against the inner circumferential surface 12 of the cylindrical portion 12b of the elastic body 12.
d and the outer circumferential surface (horizontal outer surface) 18a of the gland 18 are fitted, so that the propeller shaft 3 is moved with the distance between the stern frame boss portion 2 and the propeller boss portion 5 widened due to thermal expansion of the intermediate shaft. Even when rotating, the elastic body 12 is always
Since it is in contact with the ground 18, it does not enter the inside of the rope guard 4.

As explained above, in the rope wrapping prevention device of this invention, the elastic body 12 connects the end surface 12c of the elastic body 12 (or guide ring 13) to the front surface 13c of the propeller boss portion 5, and The inner circumferential surface 12d is in contact with the outer circumferential surfaces 13d and 18a of the propeller boss 5, and the rear surface 12e of the elastic body 12 is in contact with the end surface 13e of the propeller boss 5, so that the elastic body 12 is in contact with the propeller boss 5. are in three stages, so that even if the rope gets caught between the end surface 12c of the elastic body 12 and the front surface 13c of the propeller boss section 5, the inner circumferential surface 12d of the elastic body 12 and the outer circumferential surface 13 dt 18 a of the propeller boss section 5 (7) The contact portion prevents the rope from moving toward the propeller shaft 3 side, and even if the rope enters the contact portion between the inner peripheral surface 12d and the outer peripheral surface 13d, the rear surface 12e of the elastic body 12 and the propeller boss portion Since the contact portion of the end surface 13e of 5 acts to stop the rope from moving toward the propeller shaft 3 side, the rope does not go inside the rope guard, not only on small ships but also on large ships with many intermediate shafts. It will not get in and wrap directly around the propeller shaft.

Furthermore, the structure is simple, and the conventional rope guard can be used as is or after being modified appropriately, so it can be easily implemented not only in new ships but also in existing ships.

Moreover, it can be applied not only to large ships but also to small ships.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention. Fig. 1 is a longitudinal cross-sectional view of a rope wrapping prevention device according to the invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a cross-sectional view of the rope wrapping prevention device according to the invention. FIG. 3 is a vertical cross-sectional view of another embodiment of the invention. 2... Stun frame boss part, 3...
Propeller shaft, 4... Rope guard, 5...
...Propeller boss part, 12...Elastic body, 12b
...Cylindrical part, 13...Guide ring,
13b... Cylindrical part.

Claims (1)

[Scope of utility model registration request] A rope guard 4 concentrically surrounds the propeller shaft 3 on a stern frame boss portion 2 that rotatably supports the propeller shaft 3, and a free end is attached to a portion of the propeller boss portion 5 attached to the propeller shaft 3. In a device for preventing a rope from wrapping around a propeller shaft, an elastic body 12 is provided at the free end of the rope guard 4 in contact with the propeller boss 5. The rear vertical surface 12e is also the rear vertical surface 1 of the elastic body 12.
A front vertical surface 12c is formed concentrically on the outside of the propeller boss 2e through a horizontal inner surface 12d, while a front vertical surface 13e is formed on the center side of the propeller boss 5; A rear vertical surface 13c is formed concentrically on the outside of the elastic body 13e via a horizontal outer surface 13d, and the elastic body 12 has a front vertical surface 12 of the elastic body 12.
c to the rear vertical surface 13c of the propeller boss 5, the horizontal inner surface 12d of the elastic body 12 to the horizontal outer surface 13d of the propeller boss 5, and the rear vertical surface 12e of the elastic body 12 to the front vertical surface 13c of the propeller boss 5. A device for preventing a rope from wrapping around a propeller shaft, characterized in that it is provided in contact with a surface 13e and fixed in a fixing groove 11 of a stopper 10 fixed to a free end of a rope guard 4. .