JP3716458B2 - Lubrication mechanism of a fully swivel counter-rotating propulsion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in the lubrication mechanism of a full-turn counter-rotating propulsion device for a ship, and is capable of always effectively lubricating a counter-rotating bearing without requiring a pump or piping.
[0002]
[Prior art]
In order to improve the propulsion efficiency of a ship, a counter-rotating propulsion device has been developed. Two propellers are arranged on the same axis, and the two propellers are reversed to reverse the wasteful energy associated with the rotational flow of the front propeller. The propeller is recovered and converted into an effective propulsion force, one of which is a fully swivel type.
[0003]
As shown in FIG. 3, for example, as shown in FIG. 3, the all-turn counter-rotating propulsion device has a casing 1 supported on a hull (not shown) so as to be able to turn around a vertical axis, and an intermediate shaft 2 is arranged vertically in the casing 1. While being rotatably supported by the rolling bearing 3, a helical bevel gear 4 is attached to the lower end portion so that the driving force of the main engine is transmitted to the intermediate shaft 2 from the upper end portion.
[0004]
In the casing 1, a pair of helical bevel gears 5 and 6 meshing with the helical bevel gear 4 are arranged opposite to each other, and the front helical bevel gear 5 is arranged in the horizontal direction. A rear helical bevel gear 6 is attached to a hollow outer propeller shaft 8 disposed concentrically with the inner propeller shaft 7. The counter-rotating bearings 9 and 10 are attached to the inner periphery of both ends of the outer propeller shaft 8 so as to be rotatably supported relative to the inner propeller shaft 7, and the front end portion of the inner propeller shaft 7 and the outer propeller shaft 8. The intermediate portions are rotatably supported by the casing 1 via rolling bearings 11 and 12, respectively.
[0005]
Further, a front propeller 13 is attached to the tail end of the outer propeller shaft 8, and a rear propeller 14 is attached to the tail end of the inner propeller shaft 7. A seal device 15 is provided between the casing 1 and the outer propeller shaft 8, and a counter rotating seal device 16 is provided between the front propeller 13 and the inner propeller shaft 7.
[0006]
In such a full-turn counter-rotating propulsion device, the driving force of the main engine transmitted to the intermediate shaft 2 is distributed and transmitted to the two helical bevel gears 5 and 6 via the helical bevel gear 4. The front propeller 13 and the rear propeller 14 are inverted and driven by reversing each other and transmitting them to the inner propeller shaft 7 and the outer propeller shaft 8.
[0007]
In this fully swivel type counter-rotating propulsion device, the front bevel gear 17 and the gear chamber of the casing 1 are used for lubricating the helical bevel gears 4, 5 and 6, the counter-rotating bearings 9 and 10, and the rolling bearings 11 and 12. Lubricating oil is stored in 18 so as to lubricate.
[0008]
[Problems to be solved by the invention]
However, in such a stay-type lubrication mechanism, the lubricating oil deteriorated or fouled by the operation is used for lubrication while staying indefinitely, and mixing with fresh lubricating oil in the casing 1 does not occur. There is a problem in that it is difficult to lubricate the counter-rotating bearing away from 18.
[0009]
In addition, if the counter-rotating seal device 16 that seals seawater is damaged, there is a problem that seawater tends to enter because the pressure of the lubricating oil staying behind the counter-rotating bearing on the tail end side is small.
[0010]
On the other hand, there is a problem that special devices such as a lubricating oil electric pump and piping are required to prevent the lubricating oil from staying.
[0011]
The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a lubrication mechanism for a fully swivel counter-rotating propulsion device that can be effectively lubricated without providing a special device.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art, the lubrication mechanism of the fully swivel counter-rotating propulsion device according to claim 1 of the present invention is a bevel gear mounted on a vertically arranged intermediate shaft to which a driving force is transmitted. An inner propeller shaft and an outer propeller shaft, which are concentrically arranged on a pair of bevel gears meshing with each other and supported by counter-rotating bearings so as to be rotatable relative to each other, are respectively attached. The inner propeller shaft and the outer propeller shaft a total pivoting-rotating propulsion device fitted with a propeller tail, forming a central oil bore tip axially central portion open tail is closed at the shaft end of the bevel gear side of the inner propeller shaft In addition, a radial oil hole that opens to the rear of the tail end side counter-rotating bearing is formed in communication with the central oil hole.
[0013]
Therefore, the central oil hole and the radius oil hole of the inner propeller shaft are communicated so that one end is opened at the shaft end on the bevel gear side and the other end is opened behind the tail end side counter-rotating bearing. Along with the rotation of the inner propeller shaft, centrifugal force is applied to the lubricating oil in the center oil hole and the radius oil hole, and the lubricant is blown out from the opening of the radius oil hole.
[0014]
As a result, the lubricating oil is circulated by flowing through the tail-end side counter-rotating bearing, the gap between the inner propeller shaft and the outer propeller shaft, and the front counter-rotating bearing. It is mixed and lubricated without being used.
[0015]
The lubricating mechanism of the entire swivel-rotating propulsion system according to claim 2 of the present invention, in addition to the configuration of claim 1, wherein, at the lower end in the axial center portion shaft end of the bevel gear side of the intermediate shaft A central oil hole that is open and closed at the upper end is formed, and a radial oil hole that communicates with the central oil hole and opens at an intermediate portion of the intermediate shaft is formed.
[0016]
Therefore, the center oil hole and the radius oil hole are further formed in the intermediate shaft in the structure according to the first aspect, and the lubricating oil is blown out from the upper radius oil hole by the centrifugal force accompanying the rotation of the intermediate shaft. It is possible to circulate and further promote the circulation and mixing of the lubricating oil.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the contents of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an embodiment of a lubrication mechanism of a fully swivel counter-rotating propulsion device according to the present invention.
[0018]
The lubrication mechanism 20 of the fully swivel counter-rotating propulsion device is a lubrication mechanism attached to the already described swirl counter-rotating propulsion device of FIG. 3, and the same parts as those in FIG. Is omitted.
[0019]
In the lubrication mechanism 20 of this all-turn type counter-rotating propulsion device, a central oil hole 21 is formed at the axial center of the inner propeller shaft 7, and the tip of the central oil hole 21 is on the helical bevel gear 5 side (front). The other end on the rear propeller 14 side (rear) is closed behind the counter-rotating bearing 10 on the tail end side. A radial oil hole 22 is formed in the radial direction by opening behind the counter rotating bearing 10 on the tail end side of the inner propeller shaft 7, and the other end of the radial oil hole 22 communicates with the central oil hole 21. In the illustrated example, two radial oil holes 22 are formed in a straight line.
[0020]
Therefore, the inner propeller shaft 7 has one end of the center oil hole 21 opened in the front oil chamber 17 and two other ends of the radial oil holes 22 opened behind the counter-rotating bearing 10 on the tail end side. A series of oil holes are formed.
[0021]
In the lubrication mechanism 20 of such a fully swivel counter-rotating propulsion device, the lubricating oil is put into the front oil chamber 17 and the gear chamber 18 of the casing 1, and the central oil hole 21 opened in the front oil chamber 17. One end of the tube is immersed in the lubricating oil.
[0022]
When the fully swiveling counter-rotating propulsion device is operated in this state, the helical bevel gear 4 is rotated by the driving force from the intermediate shaft 2, and the two helical bevel gears 5 and 6 meshing with the helical bevel gear 5 are engaged. Thus, the inner propeller shaft 7 and the outer propeller shaft 8 are rotated, and the rear propeller 14 and the front propeller 13 are rotated in directions opposite to each other.
[0023]
When the inner propeller shaft 7 is rotated along with the rotation of the front propeller 13 and the rear propeller 14, among the lubricating oil filled in the center oil hole 21 and the radial oil hole 22, Centrifugal force due to rotation is applied to the lubricating oil, and the lubricating oil is blown out from the two openings on the radially outer side and supplied to the rear of the counter-rotating bearing 10 on the tail end side. The blown lubricating oil lubricates the tail end side counter rotating bearing 10, and then lubricates the front counter rotating bearing 10 from the gap between the inner propeller shaft 7 and the outer propeller shaft 8. On the other hand, as the lubricating oil is blown out, the lubricating oil in the front oil chamber 17 is sucked from the opening of the central oil hole 21, and the lubricating oil circulates.
[0024]
In this way, the lubricating oil is always circulated to the counter rotating bearings 9 and 10 so that the new lubricating oil is supplied without stagnation and good lubrication is performed, thereby preventing the counter rotating bearings 9 and 10 from being damaged. it can.
[0025]
Further, when lubricating oil is blown out behind the counter-rotating bearing 10 on the tail end side, the pressure of this lubricating oil prevents seawater from entering as much as possible even if the counter-rotating sealing device 16 is damaged. Contamination by seawater can be prevented.
[0026]
Next, a lubrication mechanism 30 of a fully swiveling counter-rotating propulsion device according to another embodiment of the present invention will be described with reference to FIG. 2, but the same parts as those in FIG. 1 and FIG. .
[0027]
In the lubrication mechanism 30 of this all-turn type counter-rotating propulsion device, in addition to the central oil hole 21 and the radial oil hole 22 of the inner propeller shaft 7, the central oil hole 31 and the radial direction are also provided to the vertically disposed intermediate shaft 2. Oil holes 32 are formed.
[0028]
That is, the central oil hole 31 constituting the lubrication mechanism 30 has a lower end opened at the lower side of the helical bevel gear 4 at the axial center of the intermediate shaft 2 and an upper end closed at the intermediate portion of the intermediate shaft 2. Two radial oil holes 32 are formed in the radial direction in communication with the upper end portion of the central oil hole 31, and the outer end is opened in the casing 1.
[0029]
Therefore, as in the case of the inner propeller shaft 7, the lubricating oil can be further circulated using the centrifugal force generated by the rotation of the intermediate shaft 2.
[0030]
In the above two embodiments, two radial oil holes are formed in the diameter direction. However, one or two or more radial oil holes may be formed and blown out by centrifugal force applied to the lubricating oil. It only has to be allowed.
[0031]
【The invention's effect】
As described above in detail with reference to the embodiment, according to the lubricating mechanism of the all-turn type counter-rotating propulsion device according to claim 1 of the present invention, the central oil hole and the radial oil hole of the inner propeller shaft are communicated with each other. Since one end is opened to the shaft end of the bevel gear and the other end is opened to the rear of the tail-end side counter-rotating bearing, the center oil hole and the radius oil hole are moved along with the rotation of the inner propeller shaft. Centrifugal force is applied to the lubricating oil, and it can be blown out from the opening of the radius oil hole.
[0032]
As a result, the lubricating oil is circulated by flowing through the tail-end side counter-rotating bearing, the gap between the inner propeller shaft and the outer propeller shaft, and the front counter-rotating bearing. It can be mixed and circulated and lubricated without being used.
[0033]
Furthermore, since the lubricating oil blown out behind the tail-end side counter-rotating bearing is under pressure, seawater sealing can be prevented as much as possible even if the counter-rotating seal device is damaged.
[0034]
Further, according to the lubrication mechanism of the fully swiveling counter-rotating propulsion device according to claim 2 of the present invention, in addition to the structure according to claim 1 , the center oil hole and the radius oil that are further opened at the shaft end also on the intermediate shaft. Since the holes are formed, the lubricating oil can be circulated by being blown out from the radial oil hole at the upper end by the centrifugal force accompanying the rotation of the intermediate shaft, and the circulation and mixing of the lubricating oil can be further promoted.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of a lubrication mechanism of a fully swiveling counter-rotating propulsion device according to the present invention.
FIG. 2 is a longitudinal sectional view of another embodiment of the lubrication mechanism of the fully swiveling counter-rotating propulsion device according to the present invention.
FIG. 3 is a vertical cross-sectional view of a conventional full-turn counter-rotating propulsion device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Casing 2 Intermediate shaft 3 Rolling bearing 4,5,6 Bevel gear 7 Inner propeller shaft 8 Outer propeller shaft 9 Counter rotating bearing 10 Counter rotating end rotating shaft bearing 11, 12, Rolling bearing 13 Front propeller 14 Rear propeller 15 Seal Device 16 Counter rotating seal device 17 Front oil chamber 18 Gear chamber 20 Lubricating mechanism 21 of fully swiveling counter rotating propulsion device 21 Central oil hole 22 Radial oil hole 30 Lubricating mechanism 31 of fully rotating counter rotating propulsion device 31 Oil hole 32 Radial oil hole

Claims (2)

An inner propeller that is concentrically disposed on a pair of bevel gears that mesh with each other in opposition to a bevel gear that is mounted on a vertically disposed intermediate shaft to which a driving force is transmitted and that is supported by a counter rotating bearing so as to be rotatable relative to each other. This is a fully swivel counter-rotating propulsion device with a shaft and an outer propeller shaft attached, and a propeller attached to the tail ends of the inner propeller shaft and the outer propeller shaft, and the tip is a bevel gear at the axial center of the inner propeller shaft A central oil hole that is open at the shaft end on the side and closed at the tail end, and a radial oil hole that opens to the rear of the tail end side counter-rotating bearing is formed in communication with the central oil hole. Lubricating mechanism of the fully swivel counter-rotating propulsion device. The lower end in the axial center portion defining a central oil hole open upper end is closed at the shaft end of the bevel gear side of the intermediate shaft, an opening in the middle portion of the intermediate shaft communicates this central oil bore 2. A lubrication mechanism for a fully swivel counter-rotating propulsion device according to claim 1, wherein a radial oil hole is formed.

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