JPS62134396A - Marine contra-rotating propeller shaft lubricating device - Google Patents

Abstract

PURPOSE:To improve bearing performance for outer and inner shafts by installing a seal member for separating from each other, sections of lubricating oil flowing towards the first or the second drain port, between a stern tube and the outer shaft. CONSTITUTION:Lubricating oil fed from a pump 2 and a cooler 3 to an inlet tube 7 for outer shaft lubricating oil lubricates, a supply port 24, a shaft seal device 14a for outer shaft, a bearing 16a for outer shaft and further an external bearing 16 and then discharged from a drain port 25b through an outlet tube 5b. On the other hand, lubricating oil fed to an inlet tube 4 lubricates, through an inner passage 18a of an inner shaft 18 and a passage part 26, a shaft seal device 13a for inner shaft and a bearing 15a for inner shaft and further lubricates, while flowing along the periphery of the inner shaft 18, a bearing 15b for inner shaft and a shaft seal device 13b and next lubricates a shaft seal device 14b for outer shaft along the periphery of an outer shaft 17 and then is discharged from a drain port 25a through an outlet tube 5a. Respective passages for both of these lubricating oil are liquid-tightly sealed from each other by a labyrinth seal 19. In this way bearing performance is sharply improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating device for a bearing in a propeller shaft system of a counter-rotating marine propeller.

[Conventional technology]

In general, there is a contra-rotating marine propeller as shown in Fig. 3, in which an outer shaft 2' with a bow propeller 7' at the rear end is disposed to pass through the inside of the stern tube 1'. , is supported by a stern outer shaft bearing 5' and a bow outer shaft bearing 6', which are interposed between the stern tube 1' and the outer shaft 2'.

In addition, an inner shaft 1' having a bow propeller 8' at its rear end is disposed coaxially with the outer shaft 2', passing through the outer shaft 2'.
It is supported by an inner shaft bearing 3' on the stern side and an inner shaft bearing 4' on the bow side, which are interposed between the outer shaft 2' and the inner shaft 1'.

It is connected to the main engine (not shown) via a reversing device (not shown),
The propellers 8' and 7' can be driven to rotate in opposite directions.

On the other hand, stern tube shaft sealing devices 9'a and 9'b for the outer shaft are provided between the stern tube 1' and the outer shaft 2' on the outside and inside the ship, respectively, and the stern tube shaft sealing device for the inner shaft 10
'a and 10'b are provided at the openings between the outer shaft 2' and the inner shaft 1' outside and inside the ship, respectively, and these stern tube shaft sealing devices 9'a, 9'b, 10'a and 10'l] is the inner axis 1'.

In addition to preventing relative axial movement of the outer shaft 2' and the stern tube 1', leakage of lubricating oil in the inner shaft bearings 3', 4' and the outer shaft bearing 5Z6t is also prevented.

Conventionally, in a lubricating device for the propeller shaft system of a contra-rotating marine propeller as described above, lubricating oil is supplied to the front end of the stern tube 1' inside the ship, as shown in Fig. fjS3.
A lubricating oil supply port 12 for supplying between ' and the outer shaft 2'
' is provided in the outer shaft 2', and a lubricating oil passage section 13' is connected from the outer peripheral surface of the outer pipe 12' near the outer shaft stern tube shaft sealing device 9'a to the stern side inner side of the outer shaft 2'. The lubricating oil supplied from the lubricating oil supply port 12' reaches the shaft bearing 3' along the outer peripheral surface of the outer shaft 2'.
Outer shaft stern tube shaft sealing device 9'a and lubricating oil passage section 13'
After passing through the inner shaft 1', the lubricating oil is applied along the outer peripheral surface of the inner shaft 1' to the stern inner shaft bearing 3', the stern tube sealing device 10a for the inner shaft, and the bow inner shaft bearing 4'. A passage is constructed.

In addition, a lubricating oil discharge passage 14' is formed on the outer shaft 2' through which lubricating oil that has passed through the bow side inner shaft bearing 4' can be discharged through an oil drain port 15' formed on the bow side of the stern tube 1'. has been done.

Furthermore, conventionally, the stern tube shaft sealing device 10'b for the inner shaft on the bow side
For lubrication, a separate lubrication device from the above-mentioned lubrication device is provided, and in this device, lubricating oil is supplied from a lubricating oil supply port 16' provided on the bow side of stern tube 1'. After lubricating the inner shaft stern tube shaft sealing device 10'b on the bow side through the lubricating oil passage 18' formed in the outer shaft 2',
A lubricating oil passage is formed such that the lubricating oil is discharged through a lubricating oil passage portion 17' bored in the inner shaft 1' and through an oil drain port 15'.

Therefore, in the conventional marine counter-rotating propeller shaft lubrication system as described above, the lubricating oil supply port 1 is
The lubricating oil flowing from the outer shaft 2' lubricates the bow side outer shaft bearing 6' and the bow side outer shaft 1iJ stern tube shaft sealing device 9'1), and then flows along the outer peripheral surface of the outer shaft 2' to the stern side. As shown by arrow B, on the stern side of the outer peripheral surface of the outer shaft 2', the stern inner shaft bearing 3' and the stern tube sealing device 9'a for the outer shaft on the stern side are connected.
Lubricate.

Then, as shown by arrow C, the lubricating oil flows into the outer circumferential surface of the stern inner shaft 1' through the lubricating oil passage 13', and flows into the stern inner shaft bearing 3' and the stern pipe for the stern inner shaft. After passing through the shaft sealing device 10', as shown by arrow E, it flows into the bow side of the glQ along the circumferential surface of the inner shaft 15'' and lubricates the bow side outer shaft bearing 6'.

At this stage, the temperature of the lubricating oil has risen extremely high.
The lubricating oil that has passed through the bow side outer shaft bearing 6' is not suitable for manual lubrication, so as shown by arrow F, the lubricating oil is
The lubricating oil is discharged through a lubricating oil discharge passage consisting of a lubricating oil discharge port 15' and a lubricating oil discharge port 15'.

Furthermore, in order to lubricate the inner shaft stern tube shaft sealing device 10'b on the bow side, the low-temperature lubricating oil supplied from the lubricating oil supply port 16' is supplied to the lubricating oil passage section 18' as shown by arrow H. After lubricating the inner shaft stern tube shaft sealing device 10''b through the lubricating oil passage section 1 provided in the inner shaft 1', as shown by arrow G,
7' and is discharged from the oil drain port 15' as shown by arrow F.

[Problems to be Solved by the Invention] However, in the conventional marine counter-rotating propeller shaft lubrication system as described above, the inner shaft 2' and the outer shaft 2', which are structurally extremely heavy, are attached to their respective bearings. Because they are supported and rotate at high speed, the temperature of the lubricating oil increases significantly during the process of fluidly lubricating the bow outer shaft bearing 6', the stern outer shaft bearing 5', and the stern inner shaft bearing 3', causing extremely high temperatures. The lubricating oil is supplied to the bow inner shaft bearing 4'. Therefore, an oil film of lubricating oil is not formed on the sliding surface of the bow inner shaft bearing 4', and the bow inner shaft bearing 4' is supplied with lubricating oil. The lubrication performance of the bearing 4' deteriorates significantly, and in some cases, the inner shaft 1' and bow inner shaft bearing 4
This causes problems such as direct contact between the two parts and the occurrence of external firing.

In addition, a lubricating oil passage portion 17 is bored in the inner shaft 1' to form a lubricating device for the stern tube shaft sealing device 10'b for the inner shaft on the bow side.
', the size of the passage radius is limited due to the structural strength of the inner shaft 1', but this causes a very large pressure loss in the lubricating oil and makes it difficult for the lubricating oil to flow. The stern tube shaft sealing device for the inner shaft on the bow side also has the problem of lacking reliability as a lubrication system.

The present invention attempts to solve these problems by independently providing a lubricating oil supply system that lubricates the shaft system of the inner shaft and a lubricating oil supply system that lubricates the shaft system of the outer shaft. Accordingly, it is our intention to provide a contra-rotating marine propeller shaft lubrication device that improves the lubrication performance of the propeller shaft system of a contra-rotating marine propeller.

[Means for solving problems]

For this reason, the marine contra-rotating propeller shaft lubrication device of the present invention has a counter-rotating propeller shaft system installed at the stern, which has a first lubricating oil supply system that warms the outer shaft bearing and an inner shaft bearing. a second lubricating oil supply system for lubrication, and the first lubricating oil supply system supplies the stern side outer circumferential surface of the outer shaft to the bow side bearing of the outer shaft via the stern side bearing of the same outer shaft. The lubricating oil that has passed through the first lubricating oil passage leading to the outer shaft and the bow side bearing of the outer shaft can be discharged through a first oil drain port formed in the stern tube.
The lubricating oil supply system of tIS2 passes through the internal passage of the inner shaft, passes through the stern bearing of the inner shaft, and connects to the bow bearing of the inner shaft. a second lubricating oil passage leading to the inner shaft, and a second lubricating oil discharge passage through which the lubricating oil that has passed through the bow side bearing of the inner shaft can be discharged through the oil drain port of tjS2 formed in the stern tube. A sealing member is formed to separate the lubricating oils flowing toward the first and second oil drain ports, and the seal member is formed between the inner circumferential surface of the stern tube and the outer circumferential surface of the outer shaft. It is characterized by being placed between.

[For production]

In the marine contra-rotating τ1 propeller shaft lubrication system of the present invention described above, the outer shaft bearings and the outer shaft sealing device on the bow and stern sides are lubricated by the lubricating oil supplied by the first lubricating oil supply system. The inner shaft bearings and inner shaft sealing devices on the bow and stern sides are lubricated by the lubricating oil supplied by the second lubricating oil supply system.

〔Example〕

Below, a contra-rotating marine propeller shaft lubrication system as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a longitudinal sectional view thereof, and Fig. 2 is an enlarged sectional view of the section ■ in Fig. 1. It is.

As shown in FIG.
The outer shaft 17 with a Repe pattern 7
, Also, an internal passage 1 with the stern propeller No. 1 at the rear end.
An inner shaft 18 having a diameter of 8a passes through the outer shaft 17 and connects to the outer shaft 1.
7 and interposed between the outer shaft 17 and the inner shaft 18.

15b.

These inner shaft 18 and outer shaft 17 are connected to each other by an elastic joint 2.
1 and a marine motor 2 via a reduction and reversing gear device 20.
2, so that propellers 1 and 12 can be driven to rotate in opposite directions.

On the other hand, outer shaft sealing devices 14a and 14b are provided between the stern tube 23 and the outer shaft 17 on the outside and inside the ship, respectively, and the inner shaft sealing devices 1'3a and 1
3b are the outer shafts 17 in the outboard and 51) respectively.
These shaft sealing devices 13n', 1313.14a and 14b are provided between the outer shaft 1 and the inner shaft 18.
7. In addition to preventing relative axial movement of the inner shaft 18 and the stern tube 23, the inner shaft bearing l5as151+ and the outer shaft bearing 16 at 1. This prevents lubricating oil from leaking at Gb.

In the device of this embodiment for lubricating the shaft system of a marine counter-rotating propeller as described above, the outer shaft lubricating oil population W7 is used.
A lubricating oil supply port 24 is formed in the stern tube 23 to supply lubricating oil to the outer shaft sealing device 14n on the outer periphery of the outer shaft 17, and the lubricating oil flowing from the lubricating oil supply port 24 is connected to the outer shaft shaft sealing device 14n on the outer circumference of the outer shaft 17. A first lubricating oil passage (see arrows I and J) extends along the outer peripheral surface of the outer shaft 17 to the outer shaft bearing 161 on the bow side via the sealing device 14a and the outer shaft bearing 16g. Provided.

A first fJSl oil drain port 25 is provided at the front end of the stern tube 23, and the first oil drain port 251) is connected to the lubricating oil outlet pipe 5b. 51), a lubricating oil discharge passage f:tSl (see the arrow) is configured through which the lubricating oil that has passed through the outer shaft bearing 16b can be discharged, and the lubricating oil discharge passage from the first lubricating oil passage and the lubricating oil discharge passage to the outer shaft A first lubricating oil supply system is configured to lubricate the bearing.

On the other hand, the internal passage 18a of the inner shaft 18 is connected to the inner shaft lubricating oil inlet pipe 4 at its bow end, and is connected to the inner shaft lubricating oil inlet pipe 4 at its stern end. The lubricating oil that is connected to the inner side of the inner shaft sealing device 13a between the inner shaft 18 and the outer shaft 17 by the oil passage portion 26, and flows into the inner passage 18a from the inner shaft lubricating oil inlet pipe 4,
It passes through the lubricating oil passage 26 and reaches the outer circumferential surface of the inner shaft 18, and passes through the inner shaft sealing device 13a and the inner shaft bearing 15a to the inner shaft 1.
QC'? The lubricating oil passage at t52 (arrows B, C, D, E) leads to the inner shaft bearing 15b and the inner shaft sealing device 13b on the ff side.

(see F) is provided.

A second oil drain port 25 (l) is provided on the front end side of the stern Irf 23 oil drain port 25b, and a second oil drain port 25n is provided on the front end side of the stern Irf 23.
is connected to the lubricating oil outlet pipe 5al:'M.

Further, a lubricating oil passage portion 27 is formed in the outer shaft 17 so as to communicate between the inside of the outer shaft 17 near the inner shaft bearing 15b and the outside of the outer shaft 17 near the oil drain port 25a.

These oil drain ports 25a, lubricating oil outlet pipes 5a, and lubricating oil passages 27 constitute a second lubricating oil discharge passage (see arrow G) that can discharge the lubricating oil that has passed through the inner shaft bearing 15b. A second lubricating oil supply system for lubricating the bearing of the inner shaft is constructed from the lubricating oil passage and the lubricating oil discharge passage of fjS2.

In addition, as shown in FIG. 2, this device also allows lubricant oil to flow through a first lubricant discharge passage toward the oil drain port 25b, and lubricant oil to flow through a second lubricant discharge passage toward the oil drain port 25a. A labyrinth seal 19 is disposed between the inner circumferential surface of the stern tube 23 and the outer circumferential surface of the outer shaft 17 as a sealing member for partitioning the stern tube 23 and the outer shaft 17 .

Further, this device supplies the first lubricating oil supply system and the second lubricating oil supply system described above at a low temperature through the outer shaft lubricating oil inlet pipe 7 and the inner shaft lubricating oil inlet pipe 4, respectively. Lubricating oil tank for supplying high quality lubricating oil 1. A lubricating oil pump 2 and a lubricating oil tank 3 are connected to each other.

In addition, the code 6 in Fig. 1 is a sight glass, 8° CII+
f,'lze<+11thfffl'F'! '
i n l+ i(+L 4 :'-Chichigi Since the marine counter-rotating propeller shaft lubrication device as an embodiment of the present invention is configured as described above, the lubricating oil tank 1
As shown by the arrow, the lubricating oil stored in the lubricating oil pump 2 and the lubricating oil cooler 3 are cooled and sent out to the lubricating oil inlet pipe 7 for the outer shaft and the lubricating oil inlet pipe 4 for the inner shaft.
will be sent to

Of these, as shown by arrow I, the outer shaft lubricating oil population tr
The lubricating oil fed to f7 flows out from the lubricating oil supply port 24, lubricates the outer shaft sealing device 14a and the outer shaft bearing lea while maintaining a low temperature, and then flows as shown by arrow J. ,
6j along the outer circumferential surface of the outer shaft 17 (outer shaft bearing 16
Lubricate b.

After lubrication, the lubricating oil is discharged from the oil drain port 251) through the lubricating oil outlet pipe 5b, as shown by the arrow.

On the other hand, as shown by arrow B, the lubricating oil fed to the inner shaft lubricating oil inlet pipe 4 is transferred to the inner shaft 18 as shown by arrows C and D.
The lubricating oil flows through the internal passage 18a from the bow to the stern, flows out from the lubricating oil passage 2G to the stern of the outer peripheral surface of the inner shaft 18, as shown by arrow E, and seals the inner shaft while maintaining a low temperature. Lubricate the device 13a and the inner shaft bearing 15a.

Then, as shown by arrow F, this lubricating oil flows toward the bow along the outer circumferential surface of the inner shaft 18, and after lubricating the inner shaft bearing 15b and the inner shaft sealing device 13b, the lubricating oil flows into the lubricating oil passage section 2.
7 to the outer circumferential surface of the outer shaft 17, and lubricates the outer shaft sealing device 141] at a relatively low temperature.

After lubrication, the lubricating oil is discharged from the oil drain port 25a through the lubricating oil outlet pipe 5a, as shown by arrow G.

By the way, the lubricating oil flowing through the lubricating oil outlet pipe of @,1 and f
Although a pressure difference may occur between the lubricating oil flowing through the lubricating oil discharge passage of S2, the labyrinth seal 19 as a sealing member between the respective lubricating oils maintains a liquid-tight seal. The lubricating oils do not interfere with each other.

In addition, a sight glass 6.6 is provided between the lubricating oil outlet pipes 5b and 5a so that the flow of lubricating oil flowing through the first lubricating oil supply system and the second lubricating oil supply system can be visually observed. There is. Lubricating oil outlet pipe 5b via sight glass 6.6
And the lubricating oil flowing through 5a, as shown by arrow II,
After merging, lubricating oil tank 1: 2-cycle oil is stored and stored.
Reused as lubricant.

Note that the lubricating oil drop pipes 8 and 9 are connected to the inner shaft 18 from the stern pipe 23.
When performing work such as pulling out the outer shaft 17, the stern tube 2
This is provided to extract the lubricating oil from the lubricating oil tank 1 and return it to the lubricating oil tank 1.

As described above, according to the marine counter-rotating propeller shaft lubrication device as an embodiment of the present invention, the first two
Since the lubricating oil supply system and the second lubricating oil supply system that lubricates the inner shaft system are provided completely independently, each bearing and shaft sealing device can be lubricated with low-temperature, high-quality lubricating oil. This makes it possible to dramatically improve the performance of each bearing compared to conventional bearings.

In addition, the flow rate of lubricating oil flowing through the first and second lubricating oil supply systems can be measured independently and adjusted,
In addition to being an extremely reliable lubrication system, by keeping the oil pressure of the lubricating oil flowing through the first and second lubricating oil supply systems higher than the water pressure of seawater, seawater is prevented from entering the ship. Ru.

Further, along the axis of the inner IiI+18, the inner passage 18g
By providing the inner shaft 18, the weight of the inner shaft 18 is reduced and the surface pressure applied to each bearing is reduced, so that the performance of each bearing is further improved.

〔Effect of the invention〕

As described in detail above, according to the marine contra-rotating propeller shaft lubrication device of the present invention, in the counter-rotating propeller shaft system provided at the stern, the first lubricating oil supply system lubricates the outer shaft bearing. Lubricate the inner shaft bearing! ll's2 lubricating oil supply system, and the first lubricating oil supply system extends from the stern-side outer peripheral surface of the outer shaft to the bow side of the outer shaft via the stern-side bearing of the outer shaft. a first lubricating oil passage leading to the bearing; and a first lubricating oil outlet passage through which the lubricating oil that has passed through the bow side bearing of the outer shaft can be discharged through a first oil drain port formed in the stern tube. The second lubricating oil supply system includes a second lubricating oil passage that reaches the bow side bearing of the inner shaft, and a lubricating oil passage that passes through the bow side bearing of the inner shaft. a second lubricating oil discharge passage that can be discharged through a second oil drain port formed in the stern tube, and
A sealing member that separates the lubricating oils flowing toward the two oil drain ports is disposed between the inner circumferential surface of the stern tube and the outer circumferential surface of the outer shaft. The first and second lubricating oil supply systems directly supply low-temperature, high-quality lubricating oil to each of the outer shaft bearing and the inner shaft bearing. Since the sliding surfaces of the inner shaft bearings are constantly lubricated with fluid, the bearing performance of the outer shaft and inner shaft can be dramatically improved.

In addition, since an internal passage is provided along the axis of the inner shaft, it is possible to reduce the weight of the inner shaft1), reducing the surface pressure applied to each bearing, and improving the bearing performance of the outer and inner shafts. Improve further.

Furthermore, the amount of lubricating oil flowing through the first lubricating oil supply system is independently measured and adjusted. This makes it possible to significantly improve the reliability of the lubrication system, simplify inspection and maintenance, and improve fj
By keeping both the hydraulic pressure of the swamp oil flowing through the Sl lubricating oil supply system and the hydraulic pressure of the lubricating oil flowing through the 12 lubricating oil supply system higher than the water pressure of seawater, it is possible to reliably prevent seawater from entering the ship. There is also.

[Brief explanation of drawings]

Figure 1.2 shows a marine counter-rotating propeller shaft lubrication system as an embodiment of the present invention, Figure tJJ1 is a longitudinal cross-sectional view thereof, and Figure fjS2 is a cross-sectional view showing part ■ in Figure 1 enlarged. Fig. f53 is a longitudinal sectional view showing a conventional marine counter-rotating propeller shaft lubricating device. 1...Lubricating oil tank, 2...Lubricating oil pump, 3...Lubricating oil cooler, 4...Lubricating oil inlet pipe for inner shaft, 5n, 5b...
Lubricating oil outlet pipe, 6... Sight glass, 7... Lubricating oil inlet pipe for outer shaft, 8, 9... Lubricating oil drop pipe, 10... Valve,
1st...Stern side propeller, 12... Bow side propeller, 1
3atl: (b...Shaft sealing device for inner shaft, 14L1.14L
l...Shaft sealing device for outer shaft, 15a, 151)...Inner shaft bearing, 16a, 16b...Outer shaft bearing, 17...Outer shaft, 18...
-Inner shaft, 18a...Internal passage, one...Labyrinth seal as a seal member, 20...Reduction and reversal gear device,
21...Elastic joint, 22...Marine motor, 23...Stern tube, 24...Lubricating oil supply port, 25m...F52 oil drain port, 25b...1st oil drain port, 26.27... Lubricating oil passage.

Claims (1)

[Claims] The contra-rotating propeller shaft system provided at the stern includes a first lubricating oil supply system that lubricates the outer shaft bearing and a second lubricating oil supply system that lubricates the inner shaft bearing, and A lubricating oil supply system includes a first lubricating oil passage extending from the stern-side outer peripheral surface of the outer shaft to the bow-side bearing of the outer shaft via the stern-side bearing of the outer shaft, and the bow side of the outer shaft. A first oil drain port that can discharge lubricating oil that has passed through the bearing through a first oil drain port formed in the stern tube.
The second lubricating oil supply system passes through the internal passage of the inner shaft and reaches the bow bearing of the inner shaft via the stern bearing of the inner shaft. and a second lubricating oil discharge passage capable of discharging the lubricating oil that has passed through the bow side bearing of the inner shaft through a second oil drain port formed in the stern tube. A sealing member is formed between the inner circumferential surface of the stern tube and the outer circumferential surface of the outer shaft, and separates lubricating oils flowing toward the first and second oil drain ports. A counter-rotating marine propeller shaft lubrication device, characterized in that: