JPH0556797U - Propeller cap - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent the intrusion of seawater and the leakage of lubricating oil. [Structure] A tail end portion 2 of a propeller boss 24 attached to a tail end portion 13a of a hollow propeller shaft 13 so as to cover the tail end portion 13a.
4a has a hollow hole 2 formed in the hollow propeller shaft 13
3 and the inner propeller cap 31 connecting the propeller boss 24 to the through hole 26 formed to transfer the lubricating oil A and the like, and the outer propeller cap 33 so as to cover the outer side of the inner propeller cap 31. Is characterized by.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a propeller cap attached to the tail end of a propeller shaft.

[0002]

[Prior Art]

 Generally, the propeller cap is attached to the tail end of the propeller boss as shown in FIG.

In the example of FIG. 3, a propeller boss 2 is attached to the tail end taper portion 1 a of the hollow propeller shaft 1 connected to the engine so as to cover the tail end taper portion 1 a, and the tail end portion 2 a of the propeller boss 2 is attached. Has a propeller cap 3 attached. This propeller cap 3 forms a lubricating oil transfer passage 6 which connects a hollow hole 4 formed in the hollow propeller shaft 1 in the axial direction and a through hole 5 penetrating the propeller boss 2 in the axial direction.

Therefore, the lubricating oil A pumped through the hollow hole 4 of the hollow propeller shaft 1 is returned in the opposite direction inside the propeller cap 3 and passes through the through hole 5 to propel the shaft system including the hollow propeller shaft 1. Will be supplied to the seal device and bearing device installed in the. Now, 7 is a propeller wing.

[0005]

[Problems to be solved by the device]

 By the way, if a drifting object collides with the propeller cap 3, the propeller cap 3 may be damaged. If the propeller cap 3 is damaged, lubricating oil A will leak or seawater will invade, which poses a problem of impeding the continuation of voyage. Particularly, in recent years, from the viewpoint of preventing pollution such as environmental pollution, it is required to surely prevent the lubricating oil A from leaking out.

The present invention was devised to effectively solve the above problems.

An object of the present invention is to provide a propeller cap that can prevent intrusion of seawater and leakage of lubricating oil and the like.

[0008]

[Means for Solving the Problems]

 The present invention is formed at the tail end portion of a propeller boss attached to the tail end portion of a hollow propeller shaft so as to transfer lubricating oil and the like to the hollow hole formed in the hollow propeller shaft and the propeller boss. The inner propeller cap that connects to the through hole is attached, and the outer propeller cap is attached so as to cover the outer side of the inner propeller cap.

[0009]

[Action]

 In this way, since the propeller cap is configured in double, even if the outer propeller cap is damaged, the inner propeller cap has a hollow hole formed in the hollow propeller shaft and a through hole formed in the propeller boss. Since they are connected, intrusion of seawater and leakage of lubricating oil can be prevented in advance.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows a stern structure that employs a counter-rotating shaft as a propeller shaft, for example. As shown in the figure, a propeller shaft 12 composed of a counter-rotating shaft is inserted in the stern part of the hull 11, and the bow side of the propeller shaft 12 is connected to an engine through a planetary gear unit (not shown) installed in the ship. Has been done. The propeller shaft 12 is composed of an inner propeller shaft 13 that rotates in opposite directions and an outer propeller shaft 14 that covers the inner propeller shaft 13. The stern side propeller 15 that serves as a propulsion device is attached to the tail end of the inner propeller shaft 13. In addition, a bow propeller 16 serving as a propulsion device is attached to the tail end of the outer propeller shaft 14.

In the bow side propeller boss 17 to which the bow side propeller 16 is attached, a thrust load generated by the propulsion of the bow side propeller 16 is transmitted to the inner propeller shaft 13 and is supported by a thrust bearing or the like in the ship. Thrust bearings 18 and 19 are provided so as to sandwich the collar 21, and a radial bearing 22 is provided.

A sealing device 27 is provided to prevent the intrusion of seawater and the leakage of lubricating oil.

As shown in FIG. 1, an inner propeller shaft 13 having a hollow hole 23 for transferring the lubricating oil A and the like along the axial direction is formed, and the tail end tapered portion 13 a of the inner propeller shaft 13 is formed. A stern side propeller boss 24 is press-fitted and attached to the stern side propeller 15 so as to hold the stern side propeller 15. It is held by a nut 25 screwed to the end portion 13a. The propeller boss 24 is formed with one or a plurality of through holes 26 penetrating the propeller boss 24 in the axial direction. The through holes 26 allow the lubricating oil A or the like to be pressure-fed from the inner propeller shaft 13 to be thrust bearings 18. , 19, the radial bearing 22, the seal device 27, and the like.

In particular, an inner propeller cap 31 opened to the bow side is attached to the tail end portion 24a of the stern side propeller boss 24, and the opening end portion of the inner propeller cap 31 is flanged outward in the radial direction. It is watertightly attached to the stern side open end 23a of the hollow hole 23 and the stern side open end 26a of the through hole 26 by bolts or the like. That is, the inside of the inner propeller cap 31 forms a lubricating oil transfer passage 32 that connects these open ends 23a and 26a and returns the lubricating oil A or the like that is pumped from the hollow hole 23 to the opposite side and transfers it to the through hole 26.

An outer propeller cap 33 is attached to the tail end portion 24 a of the stern side propeller boss 24 so as to cover the outer side of the inner propeller cap 31 with a predetermined gap 34. Similar to the inner propeller cap 31, the outer propeller cap 33 is opened to the bow side, and the opening end is folded back into a flange shape and is watertightly attached with a bolt or the like. Therefore, the outer propeller cap 33 substantially constitutes a protective cap that protects the inner propeller cap 31.

As described above, in the present invention, since the propeller caps 31 and 33 having the double structure are attached to the tail end portion 24a of the propeller boss 24, the outer propeller cap 33 collides with the floating debris and is damaged. However, since the inner propeller cap 31 is attached to the inside, seawater does not invade and the lubricating oil A does not leak out. Therefore, it is possible to continue the voyage and prevent environmental pollution.

In the above embodiment, an example in which the propeller shaft 12 composed of a counter-rotating shaft is adopted has been shown, but the present invention is not limited to this, and in the case of using a single hollow propeller shaft. It can also be applied to. Further, the lubricating oil A is not limited to be directly transferred from the hollow hole 23 formed in the inner propeller shaft 13 to the through hole 26 formed in the propeller boss 24, but the lubricant oil A is folded back in the opposite direction from the hollow hole 23 to the through hole 26. It is also possible to arrange a pipe for transferring the lubricating oil A or the like.

[0019]

[Effect of the device]

 In short, according to the present invention, since the propeller cap having the double structure is attached to the tail end of the propeller boss, even if the outer propeller cap collides with a floating object and is damaged, the inner propeller cap will be inside. Since the seawater is installed, seawater does not invade and lubricating oil does not leak, which enables the voyage to continue and prevents environmental pollution in advance.

[Brief description of drawings]

FIG. 1 is a sectional view showing a propeller cap of the present invention.

FIG. 2 is a cross-sectional view showing a stern part of a hull.

FIG. 3 is a cross-sectional view showing a conventional propeller cap.

[Explanation of symbols]

 13 Hollow Propeller Shaft 13a Hollow Propeller Shaft Tail End 23 Hollow Hole 24 Propeller Boss 24a Propeller Boss Tail End 26 Through Hole 31 Inner Propeller Cap 33 Outer Propeller Cap A Lubricating Oil

Claims (1)

[Scope of utility model registration request] 1. A hollow hole formed in the hollow propeller shaft and a lubricant oil or the like are transferred to the tail end of a propeller boss attached to the tail end of the hollow propeller shaft so as to cover the hollow propeller shaft. A propeller cap, characterized in that an inner propeller cap that connects with a through hole formed as described above is attached, and an outer propeller cap is attached so as to cover the outside of the inner propeller cap.