JPH0515598B2 - - Google Patents

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, in normal single-shaft ships, when oil lubrication by sliding bearings cannot be achieved, especially when the propeller weight is large and the bearing surface pressure is extremely high, or the propeller shaft rotates at low speed, etc., static Pressure bearings are used.

That is, a propeller shaft 1' having a propeller 5' attached to its rear end is disposed through a stern frame 6' and is supported by a bearing bush 2' press-fitted into the stern frame 6'. A bearing metal (mainly white metal) 3' is provided on the inner periphery of this bearing bush 2'.
A pocket 8' is formed at the lowermost end of the inner circumferential surface, and a hydrostatic bearing is constructed by supplying high-pressure lubricating oil from a high-pressure oil pump (not shown) to the pocket 8' through an oil supply pipe 7'. It is becoming more and more common.

Also, in order to measure the temperature of the bearing metal 3',
An electric wire 9' having a temperature detection part (not shown) at its tip is
The electric wire 9' is led through the inside of the bearing bush 2' to near the bottom of the rearmost end of the bearing metal 3', and the base end of this electric wire 9' is connected to a high temperature alarm device 10' provided in the engine control room (not shown). .

The propeller shaft 1' is connected to a propulsion motor (not shown) and rotationally driven by the motor.

Further, the reference numeral 4' in the figure indicates a sealing device.

According to such a hydrostatic bearing, high-pressure lubricating oil is supplied from the pocket 8' at the lowest end of the inner circumferential surface of the bearing bushing 2', where the weight of the propeller 5' causes the propeller shaft 1' to bend and cause uneven contact. is supplied, the propeller shaft 1' is forcibly floated by the lubricating oil, and lubrication is performed.
This prevents problems such as uneven contact.

In addition, the temperature detection section at the tip of the electric wire 9' allows the
Since the temperature near the bottom of the rearmost end of the bearing metal 3' where uneven contact is most likely to occur is detected, in the unlikely event that uneven contact of the propeller shaft 1' occurs, the temperature of the bearing metal 3' will decrease due to frictional heat. When the temperature rises, it is immediately detected and the high temperature alarm device 10' diagnoses the operating condition such as an abnormality in the bearing section.

Hydrostatic bearings as described above have conventionally been applied to marine counter-rotating propeller shaft systems. This is to establish a counter-rotating bearing between the inner and outer shafts that rotate at a constant speed, where an oil film is theoretically difficult to form, even in a very low-speed one-sided contact state. In a contra-rotating propeller shaft system, as shown in FIG.
A tubular outer shaft 12' supported by the outer shaft 12' and an inner shaft 11' supported within the outer shaft 12' are provided, and these inner shaft 11' and outer shaft 12' are rotationally driven in mutually opposite directions. be done. In such a counter-rotating propeller shaft system, a lubricating oil passage 13' for guiding high-pressure lubricating oil from a hydraulic source (not shown) is formed in the inner shaft 11', and the lubricating oil passage 13' is connected to the inner shaft 11'. while communicating with a plurality of holes 14' formed radially in the
A hydrostatic bearing is constructed by tightening small hole screws 15' having an orifice restricting function into openings on the outer periphery of the inner shaft 11' of these holes 14'. Here, in FIG. 3, illustration of a bearing metal and a bearing bush that constitute a part of the hydrostatic bearing is omitted.

In such a hydrostatic bearing, high-pressure lubricating oil is supplied between the inner shaft 11' and the outer shaft 12' from a hydraulic source (not shown) via the lubricating oil passage 13' and the hole 14', and the bearing is The lubrication takes place as it is formed.

Note that normally, the inner shaft 11' and the outer shaft 12' are
As shown in the figure, there is a high possibility that contact will occur at the bottom due to deflection, so it is required to reliably supply high-pressure lubricating oil to the vicinity of this bottom. Therefore, a plurality of holes 14' are formed radially, and an extremely large amount of lubricating oil is supplied.

[Problem that the invention seeks to solve]

However, in the conventional bearing lubrication device for a marine counter-rotating propeller as described above, since the inner shaft 11' and the outer shaft 12' are inverted with respect to each other, the outer shaft 1
It is difficult to guide the electric wire 9' to the hydrostatic bearing in the vessel 2' as in the case of a single-shaft ship, and it is very difficult to measure the temperature of the hydrostatic bearing.

In addition, in the case of a hydrostatic bearing for the inner shaft in a counter-rotating propeller shaft system, the temperature rise of the bearing metal and bearing bush due to the mechanism means contact between the shaft and the bearing part that rotate in opposite directions, and the static pressure mechanism It is a terminal situation that has collapsed. Therefore, we have established a bearing diagnosis system specific to hydrostatic bearings in counter-rotating propeller shaft systems, which replaces the temperature measurement of the bearing metal conventionally applied to single-shaft ships, and allows us to constantly grasp the operating status of hydrostatic bearings. It is hoped that

In view of this situation, the present invention makes it possible to reliably grasp the operating status of the hydrostatic bearing from the temperature of the lubricating oil, and to install the hydrostatic bearing in a contra-rotating propeller shaft with sufficient safety and reliability. An object of the present invention is to provide a bearing lubrication device for a marine counter-rotating propeller, which can be adopted in a marine propeller system.

[Means for solving problems]

For this reason, the bearing lubricating device for a counter-rotating marine propeller of the present invention has an inner shaft, a bearing bush disposed on the outer periphery of the inner shaft, and a co-bearing bush in a counter-rotating propeller shaft system provided at the stern of the ship. It has a static pressure bearing consisting of a bearing metal provided in the inner shaft, and a tubular outer shaft arranged around the outer periphery of the static pressure bearing, and high pressure lubricating oil is supplied to the static pressure bearing through the inside of the inner shaft. It is equipped with a lubricating oil supply system that supplies to the pressure bearing, and a lubricating oil discharge system exclusively for the inner shaft that can discharge the lubricating oil that has passed through the hydrostatic bearing from the gap between the outer and inner shafts. It is characterized by being equipped with a hydrostatic bearing diagnostic thermometer that can measure the temperature of the lubricating oil discharged through the lubricating oil discharge system.

[Effect]

In the above-mentioned bearing lubricating device for a counter-rotating marine propeller of the present invention, the high-pressure lubricating oil supplied from the lubricating oil supply system lubricates the hydrostatic bearing, and then is discharged through the lubricating oil discharge system exclusively for the inner shaft. Then, the temperature of the discharged lubricating oil is measured by a thermometer for diagnosing a hydrostatic bearing, and the operating condition of the hydrostatic bearing is diagnosed based on the measured temperature.

〔Example〕

Hereinafter, a bearing lubricating device for a contra-rotating marine propeller as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view thereof;
As shown in the figure, in a marine counter-rotating propeller to which the device of this embodiment is applied, a tubular outer shaft 2 having a front propeller 4 at its rear end is disposed to pass through a stern frame 16. , a bow-side outer shaft bearing 12 and a stern-side outer shaft bearing 13 interposed between the inner circumferential surface of the stun frame 16 and the outer circumferential surface of the outer shaft 2.
Supported by These bearings 12, 13
Of these, the bow side outer shaft bearing 12 is configured as a normal stern tube bearing, while the stern side outer shaft bearing 13 is configured as a hydrostatic bearing.

Further, an inner shaft 1 having a rear propeller 3 at its rear end and having an inner shaft oil supply passage 18 passes through the outer shaft 2 and is disposed concentrically with the outer shaft 2, and is arranged at the rear end of the outer shaft 2. The stern inner shaft bearing 14 is interposed between the inner circumferential surface of the front end of the outer shaft 2 and the outer circumferential surface of the inner shaft 1. It is supported by a bow-side inner shaft bearing 11 installed therein.

These inner shaft bearings 11 and 14 both have bearing bushes 11a and 14 mounted on the outer periphery of the inner shaft 1.
a and a bearing metal (not shown) provided on the outer periphery of each bearing bush 11a, 14a.

The inner shaft 1 is connected to a reversing device (not shown), and the outer shaft 2 is also connected to a reversing device (not shown) via an outer shaft joint 10 and a split hollow shaft 9. The shaft 2 is connected to a main engine (not shown) via the reversing device, and is configured to rotate the propellers 3 and 4 in opposite directions.

The outer shaft sealing devices 6 and 7 are provided to close the gaps between the stern frame 16 and the outer shaft 2 on the outside and inside the ship, respectively, and the inner shaft sealing devices 5 and 8 are installed on the ship, respectively. The bearing bushes 14a and 11a of the inner shaft bearings 14 and 11 on the outside and inside the ship are provided at one end side to close the gap between the outer shaft 2 and the inner shaft 1, and these sealing devices 5 and 8 are provided. ,
In addition to preventing relative axial movement of the outer shaft 2, inner shaft 1, and stand frame 16, the bearing 1
1 to 14 to prevent leakage of lubricating oil.

In the device of this embodiment for lubricating the bearings of the marine contra-rotating propeller shaft system as described above, as shown in FIG. , a high-pressure oil supply pipe 36 is connected to the bow end through a rotary joint (not shown).
The inner shaft 1 is connected to the bearing bushes 11a, 14 near the inner shaft bearings 11, 14.
They are connected to oil supply holes 19, which are formed in large numbers radially across a and communicate with the outer periphery of a bearing metal (not shown).

In addition, a high pressure oil supply pipe 29 is provided on the inner periphery of the outer shaft bearing 13.
are connected.

The high pressure oil supply pipes 29 and 36 are
Both are connected to a high-pressure oil supply pipe 26 via flow rate adjustment valves 27, 27, and furthermore, this high-pressure oil supply pipe 2
6 is connected to a discharge port of a high-pressure oil pump 22 that discharges high-pressure lubricating oil from a lubricating oil tank 21, and the high-pressure lubricating oil from the same high-pressure oil pump 22 is supplied to the high-pressure oil supply pipes 26, 36, and the inner shaft internal oil supply. The inner shaft bearings 11, 1 as static pressure bearings pass through the passage 18 and the oil supply hole 19.
4, and passes through high-pressure oil supply pipes 26 and 29 to reach an outer shaft bearing 13 as a hydrostatic bearing.

In this embodiment, the above-mentioned lubricating oil pump 22, high-pressure oil supply pipes 26, 29, 36, and inner shaft internal oil supply passage 18 are used.
A lubricating oil supply system is constituted by the oil supply hole 19 and the like.

In addition, the high pressure oil supply pipe 26 is equipped with a check valve 24, and the high pressure oil supply pipe 36 is also equipped with an oil filter 37 and a pressure gauge 28 for detecting the oil supply pressure. There is.

On the other hand, on the outer shaft 2, there is a seal between the two seal lips on the rear end side of the three seal lips in the outer shaft sealing device 7 (that is, on the other end side of each bearing bush 11a, 14a of the inner shaft bearings 11 and 14). , an oil drain hole 2 that connects the inside and outside of the outer shaft 2 and can drain lubricating oil from the gap between the outer shaft 2 and the inner shaft 1.
0 is formed, and an oil drain pipe 38 for discharging lubricating oil from the oil drain holes 20 is connected in communication between the two seal lips in the seal device 7, and these oil drain holes 20 and Oil drain pipe 3
8 constitutes a lubricating oil discharge system exclusively for the inner shaft.

The oil drain pipe 38 is equipped with an inner shaft bearing (static pressure bearing) diagnostic thermometer 39a for measuring the temperature of the lubricating oil discharged through the inner shaft dedicated lubricating oil discharge system.
A flowmeter 40a for diagnosing the inner shaft bearing (static pressure bearing) is interposed to measure the flow rate of the lubricating oil discharged through the inner shaft dedicated lubricating oil discharge system.

Further, in order to drain lubricating oil from the gap between the outer shaft 2 and the stand frame 16, an oil drain pipe 31 is connected near between the outer shaft seal device 7 and the outer shaft bearing 12, and an oil drain pipe 31 is connected to the outer shaft bearing 13. An oil drain pipe 30 is connected to the vicinity between the oil drain pipe 30 and the outer shaft sealing device 6, and the oil drain pipe 30 is connected to the oil drain pipe 31 so as to merge with the oil drain pipe 31, and these oil drain pipes 3
0 and 31 constitute a lubricating oil discharge system exclusively for the outer shaft.

The oil drain pipe 30 on the downstream side of the confluence with the oil drain pipe 30 is equipped with an outer shaft bearing (static pressure bearing) diagnostic for measuring the temperature of the lubricating oil discharged through the outer shaft dedicated lubricating oil discharge system. A thermometer 39b is attached thereto, and a flowmeter 40b for diagnosing the outer shaft bearing (static pressure bearing) is interposed to measure the flow rate of lubricating oil discharged through the outer shaft exclusive lubricating oil discharge system.

Note that the oil drain pipes 31 and 38 merge and are connected to an oil drain pipe 32, and the oil drain pipe 32 is connected to the lubricating oil tank 21.

In addition, the inner peripheries of the bearing bushes 11a and 14a in the inner shaft bearings 11 and 14 are provided with lubricating oil that has flowed out from the outside of the bearing metal towards the inner shaft seal device 8 or 5 and is guided to the oil drain hole 20 side. for,
A plurality of oil drain grooves 11b and 14b are each formed.

Further, a seal oil supply pipe 23 and a seal oil discharge pipe 25 are connected between the two seal lips on the front end side among the three seal lips in the outer shaft seal device 7 in order to lubricate these seal lips. These seal oil supply pipe 23 and seal oil discharge pipe 25 are connected to a seal oil tank 42.

In FIG. 1, reference numeral 15 is a rope guard, 17 is a rear bulkhead of the engine room, 33 is a bypass oil drain pipe that is attached to the oil drain pipe 32 and is used in the event of a light stutter, 34 is a seal oil supply pipe 23, a seal oil discharge pipe 25, and a bypass. a stop valve installed in each of the oil drain pipes 23;
35 is a sight glass installed in the oil drain pipe 32;
1 indicates an air vent pipe attached to the oil drain pipe 32.

Since the bearing lubricating device for a marine counter-rotating propeller as an embodiment of the present invention is configured as described above, the lubricating oil stored in the lubricating oil tank 21 is
It is pressurized by a high-pressure oil pump 22 and sent out.
The oil is supplied from the high pressure oil supply pipe 26 to the high pressure oil supply pipes 36 and 29, respectively.

The lubricating oil supplied to the high-pressure oil supply pipe 36 flows into the inner shaft oil supply passage 18 of the inner shaft 1 through a rotary joint (not shown), and flows from the bow to the stern within the oil supply passage 18. , numerous refueling facilities 19
From the bearing bush 11a of the inner shaft bearings 11, 14,
14a, and these inner shaft bearings 11,
Lubricate 14. Note that the lubricating oil is supplied to the high pressure oil supply pipe 36.
When passing through, the pressure gauge 28 measures the supply oil pressure.

Then, the bearing bush 1 of the inner shaft bearings 11 and 14
After the high-pressure lubricating oil supplied to the outer peripheries of 1a and 14a lubricates these inner shaft bearings 11 and 14,
There are two types: one that flows out toward the inner shaft sealing device 8, 5 at one end of each bearing bush 11a, 14a, and one that flows out toward the other end of the bearing bush 11a, 14a.

Here, the lubricating oil that has flowed out to the other end side of the latter bearing bushes 11a, 14a passes through the gap between the outer shaft 2 and the inner shaft 1, and enters the oil drain hole 20 formed in the outer shaft 2.
and is discharged to the outside of the outer shaft 2.

In addition, the lubricating oil that has leaked into the former sealing devices 5, 8 lubricates the same sealing devices 5, 8, and then passes through oil drain grooves 11b, 14b formed in the inner circumferences of the bearing bushes 11a, 14a. Bearing bush 11
Since this lubricating oil is guided to the other end side of a, 14a, this lubricating oil is also discharged from the oil drain hole 20 to the outside of the outer shaft 2 together with the latter lubricating oil.

The lubricating oil discharged to the outside of the outer shaft 2 from the gap between the outer shaft 2 and the inner shaft 1 as described above lubricates the outer shaft sealing device 7 and then flows through the oil drain pipes 38 and 32.
However, when the lubricating oil is discharged through the oil drain pipe 38, the inner shaft bearing 1 is detected by the thermometer 39a and the flow meter 40a.
The temperature and flow rate of the lubricating oil used to lubricate 1 and 14 are measured, respectively.

On the other hand, the lubricating oil fed to the high pressure oil supply pipe 29 is
One is supplied to the inner circumference of the outer shaft bearing 13 to lubricate the outer shaft bearing 13 and function as a static pressure bearing, and then flows out toward the bow side outer shaft bearing 12, and the other flows toward the outer shaft sealing device 6. It is divided into those that flow out.

Here, the lubricating oil that leaked toward the former hull side outer shaft bearing 12 lubricates the same outer shaft bearing 12, and then
The oil is discharged from the drain pipe 31.

In addition, the lubricating oil flowing out toward the latter outer shaft sealing device 6 lubricates the same sealing device 6, and then is discharged from the oil drain pipe 30, joins with the former lubricating oil in the oil drain pipe 31, and is further drained. From oil pipe 32 to inner shaft bearing 1
1 and 14 is discharged to the lubricating oil tank 21 together with the lubricating oil, but when the lubricating oil is discharged through the oil drain pipe 31, the thermometer 39b and the flow meter 4
0b measures the temperature and flow rate of the lubricating oil that lubricates the outer shafts 12 and 13, respectively.

Note that the bow side outer shaft sealing device 7 is lubricated by natural convection through a seal oil supply pipe 23 and a seal oil discharge pipe 25 connected to a dedicated seal oil tank 42, but the inner shaft bearing 11, The supply pipe 23, the discharge pipe 25, and the seal oil tank 42 may be omitted if the temperature of the lubricating oil discharged from the oil drain hole 20 is low and the seal lip can be sufficiently cooled.

Furthermore, the lubricating oil from the high-pressure oil pump 22 is controlled by flow rate regulating valves 27 and 27 interposed in the high-pressure oil supply pipes 36 and 29, respectively, so that the lubricating oil is adjusted to the lubricating oil for the inner shaft bearing and the lubricating oil for the outer shaft bearing. The respective distribution amounts are arbitrarily set according to instructions from the flowmeter 40a, but in this embodiment, the amount of lubricating oil for the inner shaft bearing is larger than the amount of lubricating oil for the outer shaft bearing. .

As described above, in this embodiment, the temperature and flow rate of the lubricating oil that lubricates the inner shaft bearings 11 and 14 configured as static pressure bearings in the counter-rotating propeller shaft system are measured by the thermometer 39a and the flowmeter 40a, respectively. In addition, the hydraulic pressure of the lubricating oil is also measured by the pressure gauge 28, so that the operating status of the inner shaft bearings 11 and 14 can always be grasped reliably. That is, if the oil supply hole 19 in the inner shaft bearings 11, 14 is blocked, the flow rate of the lubricating oil discharged will decrease and its temperature will increase.
The situation is diagnosed using the thermometer 39a and flowmeter 40a. Additionally, if erosion or the like occurs on the inner peripheral surface of the outer shaft 2 and the gap between the inner shaft bearings 11, 14 and the outer shaft 2 becomes larger than planned, the supply oil pressure in the high-pressure oil supply pipe 36 will drop and the lubricating oil will be discharged. Since the flow rate increases, the situation is diagnosed by the pressure gauge 28 and flow meter 40a. Furthermore, the inner shaft bearing 1
When uneven contact occurs in 1 and 14, the temperature of the lubricating oil increases due to the frictional heat. The situation is diagnosed.

In this way, the operating status of the inner shaft bearings 11, 14 can be reliably grasped, and diagnosis can be made in the event that an abnormality occurs in the operating status. It can be adopted with high safety and reliability.

Furthermore, as in the case of the inner shaft bearings 11 and 14 described above, the operating status of the outer shaft bearing 12 can now be grasped and abnormalities diagnosed using the thermometer 39b and flow meter 40b. It can be used as the shaft bearing 12 with sufficient safety and reliability.

Furthermore, by making the outer shaft bearing 12 a hydrostatic pressure bearing and sharing its lubricating oil supply system with the lubricating oil supply system for the inner shaft bearings 11 and 14, shaft system alignment, simplification of the lubrication system, maintainability, etc. is improved.

Furthermore, since the high-pressure lubricating oil between the inner shaft 1 and the outer shaft 2 is reliably discharged,
It is now possible to use static pressure bearings as the inner shaft bearings 11 and 14 without causing damage to the seal devices 5 and 8, and the inner shaft bearings 11 and 14 always maintain the one-sided contact angle and bearing angle (even during low speed rotation). It becomes possible to form an oil film regardless of the load.

Therefore, seizure due to uneven contact, etc. can be reliably prevented, and the lubrication performance in the shaft system of the counter-rotating propeller is improved. In addition, there is no need to increase the shaft diameter of the inner shaft 1 in order to improve uneven contact, and the shaft diameter can be kept below the rule diameter, so the entire counter-rotating propeller shaft system can be easily and cost-effectively It can be constructed compactly and at low cost, and can also contribute to improving propeller performance.

In addition, in this embodiment, the bearing bushes 11a, 1
4a on the outer periphery of the inner shaft 1 and the same bearing bush 11.
A hydrostatic bearing is used to supply lubricating oil to the outer periphery of a and 14a, but a bearing bushing is attached to the inner periphery of the outer shaft 2 to supply lubricating oil to the inner periphery of the bearing bush. The present device is similarly applicable to hydrostatic bearings.

〔Effect of the invention〕

As detailed above, according to the bearing lubrication device for a counter-rotating marine propeller of the present invention, in the contra-rotating propeller shaft system provided at the stern, the inner shaft and the It is equipped with a static pressure bearing consisting of a bearing bush and a bearing metal provided on the bearing bush, and a tubular outer shaft disposed around the outer circumference of the static pressure bearing, and high-pressure lubricating oil is supplied to the inside of the inner shaft. A lubricating oil supply system that supplies the lubricating oil to the hydrostatic bearing via the hydrostatic bearing, and a lubricating oil discharge system exclusively for the inner shaft that can discharge the lubricating oil that has passed through the hydrostatic bearing from the gap between the outer shaft and the inner shaft. In addition, the simple configuration includes a hydrostatic bearing diagnostic thermometer that can measure the temperature of the lubricating oil discharged through the lubricating oil discharge system dedicated to the inner shaft, making it possible to accurately grasp the operating status of the hydrostatic bearing. is,
Since it will be possible to diagnose any abnormalities that occur in the operating status, it will be possible to use hydrostatic bearings as inner shaft bearings in counter-rotating propeller shaft systems with sufficient safety and reliability. It is.

In addition, by using hydrostatic bearings, the diameter of the inner shaft can be kept below the rule diameter, making it possible to easily configure the entire counter-rotating propeller shaft system in a compact manner at low cost, improving propeller performance. There is also the advantage of significantly improving

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view showing a bearing lubricating device for a contra-rotating marine propeller as an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a hydrostatic bearing in an ordinary single-shaft ship. FIG. 3 is a cross-sectional view showing a main part of a conventional bearing lubricating device for a counter-rotating marine propeller using a hydrostatic bearing. 1... Inner shaft, 2... Outer shaft, 3... Rear propeller, 4... Front propeller, 5... Seal device for inner shaft, 6, 7... Seal device for outer shaft, 8... Inner shaft sealing device, 9...2-split hollow shaft, 10...outer shaft joint, 11...bow side inner shaft bearing (static pressure bearing),
11a...Bearing bush, 11b...Drain groove, 1
2... Bow side outer shaft bearing (stern tube bearing), 13...
Stern side outer shaft bearing (static pressure bearing), 14... Stern side inner shaft bearing (static pressure bearing), 14a... Bearing bush,
14b...Drain groove, 15...Rope guard, 16
... Stan frame, 17 ... Rear bulkhead of engine room, 18 ... Inner shaft oil supply passage, 19 ... Oil supply hole,
20... Oil drain hole, 21... Lubricating oil tank, 22...
...High pressure oil pump, 23...Seal oil supply pipe, 24
... Check valve, 25 ... Seal oil discharge pipe, 26 ...
High pressure oil supply pipe, 27...Flow rate adjustment valve, 28...Pressure gauge, 29...High pressure oil supply pipe, 30-32...Oil drain pipe, 33...Bypass oil drain pipe, 34...Stop valve,
35... Sight glass, 36... High pressure oil supply pipe, 3
7... Oil filter, 38... Oil drain pipe, 39a... Inner shaft bearing (static pressure bearing) diagnostic thermometer, 39b... Outer shaft bearing (static pressure bearing) diagnostic thermometer, 40a... Inner shaft bearing (Static pressure bearing) diagnostic flow meter, 40b... Outer shaft bearing (static pressure bearing) diagnostic flow meter, 41... Air vent pipe, 42... Seal oil tank.

Claims (1)

[Scope of Claims] 1. A contra-rotating propeller shaft system installed at the stern of a ship, consisting of an inner shaft, a bearing bushing disposed on the outer periphery of the inner shaft, and a bearing metal provided on the co-bearing bushing. A lubricating oil supply system comprising a pressure bearing and a tubular outer shaft disposed around the outer circumference of the hydrostatic bearing, and supplying high-pressure lubricating oil to the hydrostatic bearing via the inside of the inner shaft. , a lubricating oil discharge system exclusively for the inner shaft that can discharge the lubricating oil that has passed through the hydrostatic bearing from the gap between the outer shaft and the inner shaft, and the lubricating oil discharged through the lubricating oil discharge system exclusively for the inner shaft. 1. A bearing lubricating device for a counter-rotating marine propeller, characterized in that a hydrostatic bearing diagnostic thermometer capable of measuring the temperature of the bearing is provided. 2. A hydrostatic bearing diagnostic flowmeter capable of measuring the flow rate of lubricating oil through the lubricating oil supply system or the inner shaft exclusive lubricating oil discharge system, and a hydrostatic bearing diagnostic flowmeter capable of measuring the lubricating oil pressure of the lubricating oil supply system. The bearing lubricating device for a counter-rotating marine propeller according to claim 1, further comprising a pressure gauge. 3. An outer shaft hydrostatic bearing supporting the outer shaft, and an outer shaft dedicated lubricating oil discharge system capable of discharging lubricating oil from the lubricating oil supply system via the outer shaft hydrostatic bearing, A thermometer for diagnosing the hydrostatic bearing for the outer shaft that can measure the temperature of the lubricating oil discharged through the lubricating oil discharge system exclusively for the outer shaft, and the amount of oil in the lubricating oil supply system or the lubricating oil discharging system exclusively for the outer shaft. The bearing lubricating device for a counter-rotating propeller for a marine vessel according to claim 1 or 2, further comprising a flow meter for diagnosing a hydrostatic bearing for an outer shaft, which can measure the flow rate.