JPH0312639Y2 - - 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 art) For marine propeller shafts, ships that use oil-lubricated stern tube bearings are equipped with bearing devices, and ships that use seawater-lubricated stern tube bearings are equipped with packing holders to prevent seawater from entering. ing.

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

From this point of view, foreign matter entrainment prevention devices shown in FIGS. 3 to 5 have been conventionally employed.

That is, in the device shown in FIG. 3, 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 and attached to the propeller shaft 5. propeller 2
By extending toward the boss 2 of A, the oil-lubricated bearing 6 and the shaft sealing device 4 are guarded.

In the apparatus shown in FIGS. 4 and 5 as well, the guard 1 allows the seawater lubricated bearing 6' to guard the packing retainer 4' and the sleeve 5'.

(Problem to be solved by the invention) In the conventional technology, since the propeller 2A rotates between the guard 1 and the propeller boss 2, there are inevitably gaps A and B in the radial or axial direction.
is required to be about 10 to 15 mm.

For this reason, thin ropes such as fishing nets, seaweed, and other foreign objects are sucked into the rotating propeller shaft through the gaps A and B, and become wrapped around the propeller shaft, causing not only damage to the fishing net, but also damage to the propeller shaft. In many cases, vessels (particularly small vessels such as fishing boats) were unable to navigate.

Additionally, this 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.

Further, as shown in FIGS. 6 and 7, dovetail grooves 2B and 1A are formed on the propeller boss 2 or guard 1,
A technique in which a ring 7 made of a corrosion-resistant and wear-resistant material is fitted into these dovetail grooves 2B and 1A (Japanese Utility Model Publication No. 50-22469)
There is also a technique (see Japanese Utility Model Application Laid-open No. 104398/1983) in which a reflector 8 having a radially outwardly inclined reflector is attached to the propeller boss 2 as shown in FIG.

However, all of the prior art techniques shown in FIGS. 6 to 8 require special processing on the boss or guard, which poses a problem in terms of cost, and there are problems in equipping existing propellers and the like.

This invention reduces the amount of foreign objects such as ropes wrapped around the propeller boss, unravels the entangled foreign objects to prevent them from growing, and prevents them from entering the guard as much as possible. The purpose is to make it easy to install.

(Means for Solving the Problems) In the present invention, a cylindrical guard 10 attached to the hull side such as a stern frame boss 11 surrounds a propeller shaft 15 having a shaft sealing means A and is attached to the shaft 15. The propeller boss 17 is extended toward the propeller boss 17,
In addition, in the case where there is a gap 18 between the propeller boss 17 and the guard 10, a warp 19 is provided to prevent a rope or other foreign matter from entering and getting caught in the shaft sealing means A in the guard 10 through the gap 18. In the reflector 20 having a reflector 20 attached to the propeller boss 17, the following technical measures are taken in order to achieve the above-mentioned object.

That is, in the present invention, the reflector 20 is
A first seating portion 20A is seated on the axial end surface 17A of the propeller boss 17 and is detachably attached with a bolt 21 from the propeller axial direction, and a first seating portion 20A having a warp 19 is seated on the axial outer peripheral surface 17B of the propeller boss 17. 2. A cross section L in which the two seating portions 20B and 2 are integrally connected.
The warp 19 includes an inclined surface portion 19A whose diameter gradually increases from the outer peripheral surface of the propeller boss 17 toward the hull side, and a rising surface portion which rises vertically from the maximum diameter enlarged portion of this inclined surface portion 19A. 19B.

(Function) Foreign matter that tries to wrap around the outer circumferential surface 17B of the propeller boss 17 is
It is unraveled by the reflector 20 which has a warp 19 consisting of a curvature 19, and its growth is avoided, and intrusion into the inside of the guard 10 from the gap 18 is prevented as much as possible.

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

In FIG. 1, 10 is a cylindrical guard;
One end thereof is attached to the hull side of the stern frame boss 11, etc., and surrounds a propeller shaft 15 having a shaft sealing means A such as a bearing 12, a shaft sealing device 13, and a sleeve 14.

16 is a propeller, the boss 17 of which is fitted onto the propeller shaft 15 and attached with a key or the like;
The other end of the guard 10 is extended toward the boss 17, and there is a gap 18 in the radial direction between the outer peripheral surface of the boss 17 and the inner peripheral surface of the guard 10, or between the front end surface of the boss 17 and the rear end surface of the guard 10. There is an axial gap 18 (see FIG. 2) between them.

A corner portion 17A on the outer periphery of the end face on the guard 10 side of the propeller boss 17 has a rounded shape, and a reflector 20 having a curvature 19 consisting of an inclined surface portion 19A and a vertical rising surface portion 19B is attached to this corner portion 17A with bolts 21. The warp 19 loosens the foreign matter that grows around the outer peripheral surface of the boss 17 and prevents it from entering the guard 10 through the gap 18.

That is, the reflector 20 is a first reflector that is seated on the shaft end surface 17A of the propeller boss 17 and is detachably attached with a bolt 21 from the propeller axial direction.
The seating portion 20A and a second seating portion 20B having a warp 19 and seated on the axial outer circumferential surface 17B of the propeller boss 17 are integrally connected and have an L-shaped cross section.

Further, the warp 19 is composed of an inclined surface portion 19A whose diameter gradually increases from the outer circumferential surface of the propeller boss 17 toward the hull side, and a rising surface portion 19B which rises vertically from the maximum diameter enlarged portion of the inclined surface portion 19A. There is.

Note that the reflector 20 is annular (ring).
However, it may be a ring divided in the radial direction or a ring not divided in the radial direction, and the outer peripheral edge 2
A gap 22 of about 10 to 15 mm is formed between 0C and the guard inner peripheral surface 10A to prevent interference.

(Effects of the invention) As described above, the present invention employs the above-described structure, but by adopting this structure, ropes, fishing nets, etc. are difficult to be sucked into the cylindrical guard 10, In addition, even in the event that foreign matter is inhaled, by removing the reflector 20, a sufficient working gap is created by the clearance 18 at the front end of the propeller boss 17, making it possible to easily and reliably remove the foreign matter. Compared to conventional structures, there are fewer accidents such as damage to the shaft seal mechanism, bearings, etc., and there is no need for special work (processing) on the propeller boss 17 or guard 10, so it can be easily attached to existing propellers. It is extremely useful for the rear end structure of this type of propulsion shaft.

In particular, the warp 19 is caused by an inclined surface portion 19 whose diameter gradually increases.
The foreign matter is gradually loosened by A, and the loosened foreign matter can be reliably prevented from entering the guard 10 by the vertical rising surface section 19B following the inclined surface section 19A. A bolt 21 that is detachably attached to the propeller boss 17 connects the first seating portion 20A to the boss shaft end surface 1.
Since it is installed by screwing into the propeller 7A from the axial direction, there is no chance of foreign matter getting wrapped around it compared to a case where bolts are installed on the outer circumferential surface of the boss. Furthermore, since the reflector 20 has an L-shaped cross section in which the first seating part 20A and the second seating part 20B are integrally connected, it can be reliably attached to the propeller boss 17 while improving rigidity. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts according to an embodiment of the present invention.
FIG. 2 is a partially enlarged cross-sectional view of FIG. 1, and FIGS. 3 to 8 are cross-sectional views of main parts of the conventional example. 10... Guard, 11... Stan frame boss, 15... Propeller shaft, 17... Propeller boss, 18... Clearance, 19... Warp, 19A...
Inclined surface part, 19B... Rising surface part, 20... Reflector, 20A... First seating part, 20B... Second
Seating portion, 21... Bolt, A... Shaft sealing means.

Claims (1)

[Claims for Utility Model Registration] A cylindrical guard 10 attached to the hull side of the stern frame boss 11, etc. surrounds a propeller shaft 15 having a shaft sealing means A, and the propeller boss 17 attached to the shaft 15 A gap 18 is provided between the propeller boss 17 and the guard 10, and the guard 1 is extended through the gap 18.
A reflector 20 is attached to the propeller boss 17 and has a curvature 19 that prevents ropes and other foreign objects from entering and getting caught in the shaft sealing means A in the propeller boss 17. A first seating portion 20 is seated on the end face 17A and is detachably attached with a bolt 21 from the propeller axis direction.
A, and a second seating portion 20B having a warp 19 that is seated on the axial outer circumferential surface 17B of the propeller boss 17.
The curvature 19 is an inclined surface portion 19A whose diameter gradually increases from the outer peripheral surface of the propeller boss 17 toward the hull side.
and a rising surface portion 19B rising vertically from the maximum diameter enlarged portion of the inclined surface portion 19A.