JPH0924896A - Lubricating mechanism for full turning type counter-rotating propulsion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lubricate effectively without providing a special device by forming a center oil hole with the tip opened on the bevel gear side and with the tail end closed, in the axial center part of an inner propeller shaft, and forming radial oil holes opened to the rear of a counter bearing on the tail end side in such a way as to be communicated with the center oil hole. SOLUTION: A center oil hole 21 is formed at the axial center part of an inner propeller shaft 7, and its tip is communicated with a front oil chamber 17. Radial oil holes 22 are formed behind a counter bearing 10 on the tail end side of the inner propeller shaft 7 and communicated with the center oil hole 21. At the time of operating a full swing type counter-rotating propulsion device, lubricating oil in the radial oil hole 22 is thereby fed to the rear of the counter bearing 10 on the tail end side in association with the rotation of the inner propeller shaft 7. The lubricating Oil is returned into a gear chamber 18 after lubricating the front side counter bearing 10 from a clearance between the inner propeller shat 7 and an outer propeller shaft 8, while lubricating oil in the front oil chamber 17 is sucked from the center oil hole 21 to circulate lubricating oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lubrication mechanism of a full revolving type counter-rotating propulsion device for ships, which can always effectively lubricate counter rotating bearings without requiring a pump or piping. It was done like this.

[0002]

2. Description of the Related Art A counter-rotating propulsion device has been developed in order to improve the propulsion efficiency of a ship, and two propellers are arranged in front of and behind each other on one axis, and the propellers on the front side are reversed to waste each other due to the rotating flow of the propeller on the front side. This energy is collected by a propeller on the rear side and converted into an effective propulsion force. One of them is a full swing type.

In this full-swivel counter-rotating propulsion device, for example, as shown in FIG. 3, a casing 1 is supported by a hull not shown so as to be rotatable around a vertical axis, and an intermediate shaft 2 is vertically provided in the casing 1. It is arranged and rotatably supported by a rolling bearing 3, and a helical bevel gear 4 is attached to a lower end thereof so that the driving force of the main machine is transmitted from the upper end to the intermediate shaft 2.

In the casing 1, a pair of helical bevel gears 5 and 6 meshing with the helical bevel gear 4 are arranged so as to face each other, and the front helical bevel gear 5 is horizontally arranged. It is mounted on the arranged solid inner propeller shaft 7, and the rear helical bevel gear 6 is mounted on a hollow outer propeller shaft 8 arranged concentrically with the inner propeller shaft 7. Then, the counter rotating bearings 9 are provided on the inner circumferences of both ends of the outer propeller shaft 8.
10 is attached to and supported by the inner propeller shaft 7 so as to be rotatable relative to each other, and the front end portion of the inner propeller shaft 7 and the intermediate portion of the outer propeller shaft 8 rotate to the casing 1 via rolling bearings 11 and 12, respectively. Supported as possible.

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.

In such a full swing type counter-rotating propulsion device, the driving force of the main machine transmitted to the intermediate shaft 2 is distributed to the two helical bevel gears 5 and 6 via the helical bevel gear 4. Are transmitted as a result of being transmitted to the inner propeller shaft 7 and the outer propeller shaft 8 by reversing each other, the front propeller 13 and the rear propeller 14 are reversed and driven.

In this full-swivel counter-rotating propulsion device, the helical bevel gears 4, 5, 6 and the counter-rotating bearings 9, 10 as well as the rolling bearings 11, 12 are lubricated, so that the front oil chamber 17 of the casing 1 is lubricated. The lubricating oil is stored in the gear chamber 18 for lubrication.

[0008]

However, in such a staying type lubrication mechanism, the lubricating oil deteriorated / soiled by the operation is used for lubrication while staying for a long time, so that a fresh lubricating oil in the casing 1 can be used. However, there is a problem in that it is difficult to lubricate the counter-rotating bearing that is separated from the gear chamber 18, especially.

Further, if the counter-rotating seal device 16 for sealing sea water is damaged, the pressure of the lubricating oil staying behind the counter-rotating counter-rotating bearing on the tail end side is small, so that intrusion of sea water is likely to occur. There is.

On the other hand, there is a problem in that a special device such as a lubricating oil electric pump or piping is required to prevent the lubricating oil from staying.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a lubrication mechanism for a full-swivel counter-rotating propulsion device which can be effectively lubricated without providing a special device. Is.

[0012]

In order to solve the problems of the above-mentioned prior art, the lubrication mechanism of the full swivel counter-rotating propulsion device according to claim 1 of the present invention is arranged vertically to which the driving force is transmitted. The inner propeller shaft and the outer propeller shaft, which are concentrically arranged in a pair of bevel gears that are opposed to and mesh with the bevel gear attached to the intermediate shaft, are supported by counter-rotating bearings so that they can rotate relative to each other. A full-swivel counter rotating propulsion device with propellers attached to the tail ends of the inner propeller shaft and the outer propeller shaft, with the tip open on the bevel gear side and the tail end closed at the axial center of the inner propeller shaft. A central oil hole is formed, and a radial oil hole that opens rearward of the tail end side counter-rotating bearing is communicated with the central oil hole.

Therefore, the central oil hole and the radius oil hole of the inner propeller shaft are communicated with each other so that one end is opened 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, a centrifugal force is applied to the lubricating oil in the central oil hole and the radius oil hole, and the centrifugal oil blows out from the opening of the radius oil hole.

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 side counter rotating bearing, and the lubricating oil accumulated at one place is circulated. It is mixed and lubricated without being used forever.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the lubricating mechanism of the full-swivel type counter-rotating propulsion device has a lower end on the bevel gear side at the axial center of the intermediate shaft. A central oil hole which is opened and closed at the upper end is formed, and a radial oil hole which is communicated with the central oil hole and opens at an intermediate portion of the intermediate shaft is formed.

Therefore, in the structure according to claim 1, the central oil hole and the radial oil hole are further formed in the intermediate shaft, and the lubricating oil is ejected from the radial oil hole at the upper end by the centrifugal force accompanying the rotation of the intermediate shaft. It can be blown and circulated to further promote circulation and mixing of the lubricating oil.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The contents of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an embodiment of a lubricating mechanism of a full swing type counter-rotating propulsion device according to the present invention.

The lubrication mechanism 20 of this full-swivel counter-rotating propulsion device is a lubrication mechanism attached to the already-explained full-rotation counter-rotating propulsion device shown in FIG. 3. Is described and the description is omitted.

In the lubrication mechanism 20 of this full-rotation type counter-rotating propulsion device, a central oil hole 21 is formed in the axial center of the inner propeller shaft 7, and the helical bevel gear 5 at the tip of the central oil hole 21.
The side (front) end is open and communicates with the front oil chamber 17, and the other end on the rear propeller 14 side (rear) is closed behind the tail end side counter rotating bearing 10. There is. A radial oil hole 22 is formed in the radial direction by opening to the rear of 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, the two radial oil holes 22 are formed in a straight line.

Therefore, on the inner propeller shaft 7, one end of the central oil hole 21 is opened in the front oil chamber 17, and the other end of the radial oil hole 22 is 2 behind the counter-rotating bearing 10 on the tail end side. This means that a series of oil holes opened at some points are formed.

In the lubricating mechanism 20 of such a full-rotation type counter-rotating propulsion device, lubricating oil is put in the front oil chamber 17 and the gear chamber 18 of the casing 1 and the center opening to the front oil chamber 17 is maintained. One end of the oil hole 21 is immersed in the lubricating oil.

When the full rotation type 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, 5 meshing with the helical bevel gear 5.
The inner propeller shaft 7 and the outer propeller shaft 8 are rotated via 6 to rotate the rear propeller 14 and the front propeller 13 in opposite directions.

These front propeller 13 and rear propeller 1
When the inner propeller shaft 7 is rotated in accordance with the rotation of 4, the lubricating oil in the radial oil hole 22 out of the lubricating oil filled in the central oil hole 21 and the radial oil hole 22 is centrifuged by the rotation. A force is applied, and the lubricating oil is blown out from the two openings on the outer side in the radial direction and is supplied to the rear of the counter rotating bearing 10 on the tail end side. Then, the blown-out lubricating oil lubricates the tail end side counter rotating bearing 10 and then the front side counter rotating bearing 10 through the gap between the inner propeller shaft 7 and the outer propeller shaft 8.
While being returned to the inside of the gear chamber 18 from the opening of the central oil hole 21 as the lubricating oil is blown out.
The lubricating oil in 7 is sucked and the lubricating oil circulates.

In this way, the lubricating oil is constantly circulated to the counter rotating bearings 9 and 10 and new lubricating oil is supplied without staying, good lubrication is performed, and damage to the counter rotating bearings 9 and 10 is prevented. can do.

When the lubricating oil is blown out to the rear of the counter-rotating bearing 10 on the tail end side, the pressure of this lubricating oil prevents the intrusion of seawater as much as possible even if the counter-rotating seal device 16 is damaged. To prevent pollution by seawater.

Next, the lubrication mechanism 30 of the full-turn type counter-rotating propulsion device according to another embodiment of the present invention will be described with reference to FIG. 2. The same parts as those in FIGS. Is omitted.

In the lubricating mechanism 30 of this full-swivel 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 is also provided in the vertically arranged intermediate shaft 2. And radial oil holes 32 are formed.

That is, the central oil hole 31 constituting the lubricating mechanism 30 has a lower end opened at the axial center of the intermediate shaft 2 below the helical bevel gear 4 and an upper end at the intermediate part of the intermediate shaft 2. It is formed in a closed state, and communicates with the upper end portion of the central oil hole 31, and two radial oil holes 32 are formed in the radial direction, and the outer end is open in the casing 1.

Therefore, similarly to the case of the inner propeller shaft 7, the lubricating oil can be further circulated by utilizing the centrifugal force generated by the rotation of the intermediate shaft 2.

In the above two embodiments, two radial oil holes are formed in the diametrical direction, but one or two or more oil holes may be formed. It is enough if it can be blown out by force.

[0031]

As described above in detail with the embodiments, according to the lubrication mechanism of the full swivel type counter-rotating propulsion device according to claim 1 of the present invention, the central oil hole and the radius of the inner propeller shaft are provided. Since one end is opened at the bevel gear by communicating with the oil hole and the other end is opened to the rear of the tail end side counter rotating bearing, the central oil hole and A centrifugal force is applied to the lubricating oil in the radius oil hole, and the lubricant oil can be blown out from the opening of the radius oil hole.

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 side counter rotating bearing, and the lubricating oil accumulated at one place is circulated. It can be mixed and circulated for lubrication without being used forever.

Furthermore, since there is pressure in the lubricating oil blown out behind the tail end side counter rotating bearing, even if the counter rotating seal device is damaged, seawater sealing can be prevented as much as possible. it can.

Further, according to the lubricating mechanism of the full swivel type counter-rotating propulsion device of the second aspect of the present invention, in addition to the structure of the first aspect, a central oil hole and a radius oil hole are further provided on the intermediate shaft. Since it is formed, the lubricating oil can be blown out from the radial oil hole at the upper end and circulated 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 drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a lubrication mechanism of a full swing type counter-rotating propulsion device according to the present invention.

FIG. 2 is a vertical cross-sectional view of another embodiment of the lubricating mechanism of the full-swivel counter rotating propulsion device according to the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional full-turn type counter-rotating propulsion device.

[Explanation of symbols]

 1 Casing 2 Intermediate shaft 3 Rolling bearing 4, 5, 6 Bevel gear 7 Inner propeller shaft 8 Outer propeller shaft 9 Double reversal bearing 10 Double end reversal bearing on tail end 11, 12 Rolling bearing 13 Front propeller 14 Rear propeller 15 Seal Device 16 Double reversal seal device 17 Front oil chamber 18 Gear chamber 20 Lubricating mechanism of full swivel double reversal propulsion device 21 Center oil hole 22 Radial oil hole 30 Lubrication mechanism of full swivel double reversal propulsion device 31 Center Oil hole 32 Radial oil hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F16H 57/04 F16H 57/04 K

Claims (2)

[Claims] 1. A counter-rotating bearing which is concentrically arranged on a pair of bevel gears which are opposed to and mesh with a bevel gear mounted on a vertically arranged intermediate shaft to which a driving force is transmitted, and which are rotatable relative to each other. A fully revolving double-reversal propulsion device in which supported inner propeller shafts and outer propeller shafts are respectively mounted, and propellers are mounted at the tail ends of these inner propeller shafts and outer propeller shafts, and the central portion of the inner propeller shafts in the axial direction. A central oil hole having a tip end opened on the bevel gear side and a tail end closed is formed, and a radial oil hole opened rearward of the tail end side counter-rotating bearing is formed to communicate with the center oil hole. A lubrication mechanism for a fully revolving counter-rotating propulsion device. 2. A central oil hole having a lower end opened on the bevel gear side and a closed upper end is formed at the axial center of the intermediate shaft, and the central oil hole is communicated with the central oil hole to the intermediate part of the intermediate shaft. The lubricating mechanism for a full-swirl counter-rotating propulsion device according to claim 1, wherein a radial oil hole that opens is formed.