JPS62210198A - Bearing lubricating device for marine counter-rotating propeller - Google Patents

Abstract

PURPOSE:To improve lubricating performance by providing a seal mechanism on one side of a bearing bush, providing a lubricating oil discharging system on the other side, and guiding the lubricating oil flowing from a bearing metal to the seal mechanism from a guide path provided on the bearing bush to the lubricating oil discharging system. CONSTITUTION:The high-pressure lubricating oil fed to a feed oil passage 18 flows to the outer periphery of a bearing metal 14a of inner shaft bearings 11, 14 through many fed oil holes, and after lubricating the inner shaft bearing 11, flows out in two paths: inner shaft seal devices 8, 5 on one end side of a bearing bush 14c and the other end side. The latter lubricating oil passes a gap between an outer shaft 2 and an inner shaft 1 and flows to the outside of the outer shaft 2 through an oil discharge hole 20. The former lubricating oil lubricates the seal devices 5, 8, then passes an oil discharge groove 14b provided on the bearing bush 14c and is guided to the other end side of the bearing bush 14c, and it is discharge to the outside of the outer shaft 2 through the oil discharge hole 20 together with the latter. Accordingly, high-pressure lubricating oil can be reliably discharged through the gap between the outer shaft and the inner shaft, thus the seizure is prevented.

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 marine dual-reaction propeller.

[Conventional technology]

Generally, in normal single-shaft ships, especially large ships with heavy propellers, a hydrostatic bearing as shown in FIG. 5 is used.

That is, the propeller shaft 1' with the propeller 5' attached to the rear end is provided with a bearing disposed passing through the stern frame 6' and interposed between the stern frame 6' and the propeller shaft 1'. It is supported by a bush 2'.

A bearing metal (mainly white metal) is provided on the inner periphery of the bearing bush 2', and a pocket 8' is formed at the lowermost end of the inner periphery.
By supplying high-pressure lubricating oil from a high-pressure oil pump (not shown) through an oil supply pipe 7', a hydrostatic bearing is formed.

The propeller shaft 1' is connected to a propelling engine (not shown) and is rotationally driven by the driving rock.

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

According to this hydrostatic bearing, there is a pocket 8' at the lowest end of the inner circumferential surface of the bearing bushing 2', where the propeller shaft 1' is bent by the weight of the propeller 5', causing uneven contact.
High pressure lubricating oil is supplied from

Therefore, the propeller shaft 1' is forcibly floated by the lubricating oil, and the propeller shaft 1' is lubricated, thereby preventing problems such as uneven contact.

Hydrostatic bearings as described above have conventionally been applied to marine contra-rotating propeller shaft systems, and in this contra-rotating propeller shaft system, as shown in FIG. A tubular outer shaft 12' is provided, and an inner shaft 11' is supported within the outer shaft 12', and these inner shaft 11' and outer shaft 12' are rotationally driven in mutually opposite directions. .

A lubricating oil passage 13' is formed in the inner shaft 11' to guide high-pressure lubricating oil from a hydraulic source (not shown).The lubricating oil passage 13' is formed radially in the inner shaft 11'. It communicates with a plurality of holes 14'.

Small socket screws 15' having an orifice restricting function are tightened into the openings of these holes 14' on the outer periphery of the inner shaft 11'.

In such a pressure 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.

In addition, when applying a hydrostatic bearing to a counter-rotating propeller shaft system as described above, the groove structure of the hydrostatic bearing in a normal single-shaft ship is the same as that of a bearing bushing between the inner shaft 11' and the outer shaft 12'. Conventionally, it has also been done to intervene in the That is, a bearing bushing having a bearing metal on the inner periphery is attached to the inner periphery of the outer shaft 12' so that the bearing metal faces the vicinity of the outer periphery of the inner shaft 11' having the small hole screw 15'. .

By the way, normally the inner @11' and the outer shaft 12' are the sixth
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.

[M points while the invention is trying to solve]

However, in the conventional bearing lubricating device for a marine counter-rotating propeller, there is no means disclosed for reliably discharging a large amount of lubricating oil supplied between the inner shaft 11' and the outer shaft 12'. The lubricating oil may cause problems such as damage to the sealing device that closes the gap between the inner shaft 11' and the outer shaft 12'.

In addition, when a bearing bushing having a bearing metal is interposed between the inner shaft 11' and the outer shaft 12', the hole 1 of the inner shaft 11'
The high-pressure lubricating oil spouted from 4' will directly hit the soft bearing metal, and there is a concern that erosion may occur due to dirt and the like in the high-pressure lubricating oil. First, in a counter-rotating propeller shaft system, the inner ring 11' and the outer shaft 12' rotate in opposite directions, so the lubricating oil from the hole 14' is
Since the entire inner circumferential surface of the bearing metal is always in contact with VF, the progress of the second rotation is faster.

The present invention attempts to solve the above-mentioned problem 7, and establishes a means for discharging lubricating oil when the inner shaft bearing is configured as a static pressure bearing, thereby reliably preventing seizure due to uneven contact, etc. It is an object of the present invention to provide a bearing lubricating device for a counter-rotating marine propeller, which improves the lubrication performance in a counter-rotating propeller shaft system and prevents the occurrence of erosion in the bearing metal.

[Failure to solve the problem]

For this reason, the bearing lubrication V for marine contra-rotating propellers of the present invention
The device consists of a counter-rotating propeller shaft system installed at the stern of the ship, and consists of an inner shaft, a bearing bushing attached to the outer periphery of the inner shaft, and a bearing metal provided on the outer periphery of the same bearing bushing. a lubricating oil supply system comprising a bearing and a tubular outer shaft supported by the same 7-pressure bearing, and supplying high-pressure lubricating oil to the outer periphery of the bearing metal via the inside of the inner shaft; a seal +ffl 6'9 that closes the gap between the outer shaft and the inner shaft at one end of the bearing bush;
The other end of the bearing bushing is provided with a lubricating oil discharge system capable of discharging lubricating oil from the gap between the outer shaft and the inner shaft, and the lubricating oil leaked from the outside of the bearing metal toward the sealing hole. The bearing bush is characterized in that a lubricant guide path is formed in the bearing bush to guide the lubricant to the lubricant discharge system.

[For production]

In the bearing lubricating device for a counter-rotating marine propeller of the present invention described above, high-pressure lubricating oil is supplied to the outer periphery of the bearing metal by the lubricating oil supply system, and the lubricating oil is directed from the outside of the bearing metal to the seal 1Uit. The oil that flows out is guided to the lubricant discharge system through a lubricant guide path formed in the bearing bush.

〔Example〕

A bearing lubricating device for a contra-rotating marine propeller as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view thereof, FIG. 2 is a longitudinal cross-sectional view showing an enlarged main part thereof, FIG. 3 is a cross-sectional view of the pressure bearing part, and FIG. 4 is a cross-sectional view showing a modified example of the bearing bushing.

As shown in FIG. 1, in a contra-rotating marine 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 so as to pass through a stern frame 1G. and is supported by a bow-side outer shaft bearing 12 and a stern-side outer shaft bearing 13 interposed between the inner circumferential surface of the stun 7 frame 16 and the outer circumferential surface of the outer shaft 2. Both of these bearings 12, 13 are constructed as conventional stern tube bearings.

Further, an inner shaft 1 having a rear propeller 3 at the rear end and having an inner shaft self-lubricating passage 18 passes through the outer shaft 2 and is disposed concentrically with 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 each have a bearing bush 1 mounted on the outer periphery of the inner shaft 1, as shown in FIG.
4c, and a bearing metal 14a provided around the outer circumference of the same bearing bush 14c.

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, so that the propellers 3.4 can be rotated in opposite directions.

On the other hand, outer shaft seal devices rIi 6 and 7 are provided to close the gaps between the stern frame 16 and the outer shaft 2 on the outboard and inboard sides, respectively, and the inner shaft seal devices 5 and 8 are provided as sealing mechanisms. ,Each,
The bearing bushes 14c of the inner shaft bearings 14 and 11 outside and inside the ship are provided so as to close the gap between the outer shaft 2 and the inner shaft 1, and these sealing devices r
If5 t8 is the outer axis 2. In addition to preventing relative axial movement of the inner shaft 1 and the stand frame 16, lubricating oil is also prevented from leaking from the bearings 11 to 14.
It's two.

In the device of this embodiment for lubricating the bearing of the marine counter-rotating propeller pongee yarn as described above, as shown in FIG.
are connected to an oil supply pipe (not shown) at the bow side end thereof, and are formed in large numbers radially from the inner shaft 1 to the bearing bush 14c in the vicinity of the inner shaft bearing 11.14, and communicate with the outer periphery of the bearing metal 14a. Lubricating oil that is connected to the hole 19 and flows from a lubricating oil tank (not shown) into the inner shaft self-lubricating passage 18 via a high-pressure oil pump (not shown) and an oil supply pipe passes through the oil supply hole 19 and flows into the bearing metal 14a.
A lubricating oil supply system is provided so as to reach the outer periphery of the pipe.

Further, on the outer shaft 2, there is a section on the inner side of the outer shaft 2 near the space between the bow side outer shaft bearing 12 and the outer shaft sealing device 7 (that is, on the other end side of the bearing bushing 14c of the inner shaft bearings 11 and 14). An oil drain hole 20 is formed as a lubricating oil stray thread that communicates with the outside and can drain lubricating oil from the gap between the outer shaft 2 and the inner shaft 1.

Furthermore, an oil drain pipe 21 for discharging lubricating oil from the gap between the outer shaft 2 and the stan 7 frame 16 is provided near the space between the bow side outer shaft bearing 12 and the outer shaft sealing device 7. The oil pipe 21 is connected to a lubricating oil tank (not shown).

By the way, as shown in Figs. 2 and 3, the inner shaft bearing 11.1
The inner peripheral part of the bearing bush 14c in 4 is equipped with an inner shaft seal from the outside of the bearing metal 14a! ! L8 or 5
A plurality of oil drain grooves 14b are formed as lubricating oil guide paths in order to guide the lubricating oil flowing out toward the lubricating oil drain hole 20gA as a lubricating oil draining system.

These oil drain grooves 14b are arranged so that the bearing bushing 14c is connected to the inner shaft 1.
It is formed in the axial direction of the bearing bush 14c so as to have a contact area large enough to withstand press-fitting into the bearing bush 14c, and a passage area large enough to sufficiently drain lubricating oil.

The lubricating oil guide path may be formed as an oil drain hole 14b' in the wall of the bearing bush 14c, as shown in FIG.

Further, the reference numeral 15 in FIG. 1 indicates a rope, and the reference numeral 17 indicates a rear bulkhead of the rock flashing chamber.

Since the bearing lubricating device for a contra-rotating marine propeller as an embodiment of the present invention has the above-mentioned <4], the lubricating oil stored in the lubricating oil tank (not shown) is supplied by the high-pressure oil pump (not shown). The oil is pressurized and fed into the inner shaft self-lubricating passage 18 of the inner shaft 1 from an oil supply pipe (not shown).

In this way, the high-pressure lubricating oil supplied to the oil supply passage 18 flows from the bow to the stern in the oil supply passage 18, and is passed through the numerous oil supply holes 19 to the bearing metal of the inner shaft bearing 11, 14. 14a to the outer periphery of these inner shaft bearings 11.
Lubricate 14.

The high pressure lubricating oil supplied to the outer periphery of the bearing metal 1.4u of the inner shaft bearings 11.14 is then
．． After lubricating the bearing bushing 14c, it flows out toward the inner shaft sealing devices 8, 5 at one end side of the bearing bushing 14c;
It is divided into two parts, one flowing out to the other end side of the bearing bush 1.4c.

The lubricating oil that leaked out to the other end side of the latter bearing bush 14e passes through the gap between the outer shaft 2 and the inner shaft 1, and is transferred to the outer shaft 2.
The oil is discharged to the outside of the outer shaft 2 through a drainage hole 20 formed in the outer shaft 2.

In addition, the lubricating oil that leaked to the former seals VCFI5 and 8 was transferred to the same seal device i! After lubricating 5.8, the oil passes through the drain groove 141) formed on the inner circumference of the bearing bush 14c.
Since this lubricating oil is guided to the other end side of the bearing bush 14c, 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.

As described above, remove the outer shaft 2 from the gap between the outer shaft 2 and the inner shaft 1.
The lubricating oil discharged to the outside lubricates the outer shaft sealing device 7 and the outer shaft bearing 12, and then is discharged through the oil drain pipe 21 to a lubricating oil tank (not shown).

As described above, according to the lubricating device for a marine counter-rotating propeller of this embodiment, high-pressure lubricating oil is reliably discharged. , 8 can be used without causing damage, and it is now possible to always form an oil film on the inner shaft bearing 11.14 regardless of the contact angle or bearing load (even during low speed rotation). .

Therefore, seizure due to uneven contact, etc. can be reliably prevented, and the lubrication performance in the shaft system of the twin anti-112 propeller is improved.

In addition, since the small diameter of the inner shaft 1 can be kept below the rule diameter, the entire counter-rotating propeller shaft system can be configured easily and at low cost, which can also contribute to improving propeller performance. .

Furthermore, high-pressure lubricating oil is supplied to the bearing metal 1 through the oil supply hole 19.
4a, that is, toward the inner circumferential surface of the high-hardness outer shaft 2, the bearing metal 14a is no longer directly exposed to high-pressure lubricating oil as in the conventional case, and the two parts of the bearing metal 14a are The occurrence of lobe tan is reliably prevented.

〔Effect of the invention〕

As described in detail above, according to the bearing lubrication device for a marine counter-rotating propeller of the present invention, in the double counter-rotating propeller pongee system provided at the stern, the bearing lubrication device is attached to the inner shaft and the outer periphery of the inner shaft. It has a static pressure bearing consisting of a bearing bushing and a bearing metal provided on the outer periphery of the bearing bushing, and a tubular outer shaft supported by the static pressure bearing. a lubricating oil supply system that supplies oil to the outer periphery of the bearing metal via the bearing metal; a seal mechanism that closes the gap between the outer shaft and the inner shaft at one end of the bearing pusher; and a seal mechanism that closes the gap between the outer shaft and the inner shaft at the other end of the bearing bush. A lubricating oil discharge system capable of discharging lubricating oil from the gap between the outer shaft and the inner shaft is provided, and the lubricating oil flowing out from the outside of the bearing metal towards the seal rock 61 is guided to the lubricating oil discharge system. A simple auxiliary machine with a lubricating oil guide path formed in the bearing bushing,
Since high-pressure lubricating oil can be reliably discharged from the gap between the outer and inner shafts, static pressure bearings can be used without damaging the seals, preventing seizures due to uneven contact, etc.
This greatly improves the lubrication performance of counter-rotating propeller shaft systems.

In addition, by using hydrostatic bearings, the diameter of the inner shaft can be kept below the rule diameter, making it possible to construct the entire contra-rotating propeller shaft system easily, at low cost, and compactly, resulting in improved propeller performance. There is also the advantage of significantly improving

Furthermore, since the high-pressure lubricating oil does not directly hit the bearing metal, generation of erosion in the bearing metal is reliably prevented.

[Brief explanation of drawings]

1 to 4 show a bearing lubrication device for a contra-rotating marine propeller as an embodiment of the present invention. FIG. 1 is a longitudinal sectional view thereof, and FIG. Front view, 3rd
The figure is a cross-sectional view of the hydrostatic bearing part, FIG. 4 is a cross-sectional view showing a modified example of the bearing bushing, and FIG. 5 is a vertical cross-sectional view showing a normal uniaxial hydrostatic bearing. FIG. 6 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 as a seal mechanism, 6, 7... Seal device for outer shaft, 8... Seal tf
Seal device for inner shaft as fi lit, 9...2-split hollow shaft, 10...outer shaft joint, 11...bow side inner shaft bearing (static pressure bearing), 12...bow side outer shaft bearing (stern) tube bearing)
, 13... Stern side outer shaft bearing (stern tube bearing), 14... Stern side inner shaft bearing (static pressure bearing), 14a... Bearing metal, 1
4b... Oil drain groove as a lubricating oil guide path, 14b'...
Oil drain hole as a lubricating oil guide path, 14c...Bearing bush, 15...Rope guard, 16...Stan frame, 1
7. Engine room rear bulkhead, 18. Inner shaft self-lubricating passage, 1
9. Oil supply hole, 20. Oil drain hole as a lubricating oil discharge system,
21... Oil drain pipe. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 5

Claims (1)

[Claims] In the contra-rotating propeller shaft system installed at the stern, there is a hydrostatic bearing consisting of an inner shaft, a bearing bush attached to the outer periphery of the inner shaft, and a bearing metal provided on the outer periphery of the same bearing bush. a tubular outer ring supported by a pressure bearing; a lubricating oil supply system that supplies high-pressure lubricating oil to the outer periphery of the bearing metal via the inside of the inner shaft; A sealing mechanism for closing the gap between the outer shaft and the inner shaft of the bearing bush, and a lubricating oil discharge system capable of discharging lubricating oil from the gap between the outer shaft and the inner shaft at the other end of the bearing bush, A bearing for a contra-rotating marine propeller, characterized in that a lubricating oil guide path is formed in the bearing bush to guide lubricating oil flowing out from the outside of the bearing metal towards the sealing mechanism to the lubricating oil discharge system. Lubrication device.