JPH06107285A - Lubricating oil feeder for marine contra-rotating propeller - Google Patents

Abstract

PURPOSE:To provide a lubricating oil feeder which facilitates machining of a lubricating oil system and exerts no adverse influence to a bearing member. CONSTITUTION:In this lubricating oil feeder of marine contra-rotating propeller, which is provided with a hollow outside propeller shaft 2, an inside propeller shaft 4 rotating reversely and coaxially in the outside propeller shaft 2, and plural bearings 6 supporting the inside propeller shaft 4 in a space S between the outside propeller shaft 2 and the inside propeller shaft 4, a cylindrical member 7 which divides the space S between the inside propeller shaft 4 and the outside propeller shaft 2 in a radial direction is disposed between the plural bearings 6 to form a lubricating oil passage W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil supply device for a marine counter-rotating propeller, and more particularly to a device for supplying lubricating oil to a bearing that rotatably supports a reversing inner propeller shaft.

[0002]

2. Description of the Related Art A marine counter-rotating propeller is constructed by rotating a propeller arranged on the bow side (hereinafter referred to as "front propeller") and a propeller arranged on the stern side (hereinafter referred to as "rear propeller") in opposite directions. This is a propulsion device that attempts to recover the swirling energy of the wake generated by the rotation of the front propeller by the rotation of the rear propeller, and has recently been attracting attention from the viewpoint of improving propulsion efficiency and reducing noise.

By the way, the drive system of a large propulsion unit used in a general large ship is composed of one propeller for generating thrust and one propeller shaft for transmitting power to the propeller. In such a bearing lubricating oil supply structure in a general ship, the propeller shaft is supported by two bearings incorporated in the bow and stern of the stern tube, and lubricating oil is supplied to these bearings for lubrication. The structure is good. Therefore, the support bearing of the propeller shaft can be easily lubricated from the stationary hull.

However, when it is attempted to apply the lubricating oil supply structure for a bearing in such a general ship to the counter-rotating propeller, the lubricating oil supply structure for the bearing supporting the outer propeller shaft may be the same as the above structure. Although there is no problem, the problem is the lubricating oil supply structure of the bearing that supports the inner propeller shaft that is inside the outer propeller shaft and reverses. In addition, a hydrostatic bearing may be used for this bearing, and in this case, high-pressure lubricating oil (for example, 50 kg / cm ² or more) is supplied, so that the lubricating oil supply structure is a counter-rotating propeller. Has become an important issue for establishing a lubricating oil supply device.

As a conventional technique for providing a lubricating oil supply structure in this type of counter-rotating propeller, Japanese Patent Laid-Open No. 61-180 has been proposed.
There is an invention described in Japanese Patent Publication No. 097. The invention described in this publication, as shown in the side sectional view of FIG.
In the counter-rotating propeller in which a double propeller shaft is constituted by 1 and the inner propeller shaft 52, the inner propeller shaft 52
An axial passage 53 formed in the axial direction of the axial center and opened to the shaft surface at the rearmost bearing 54, and an axial passage 56 formed in the gap between the outer propeller shaft 51 and the inner propeller shaft 52 are provided. A lubricating oil passage is formed by communicating with each other. Therefore, the lubricating oil supplied from the shaft end is supplied to the rear bearing 54 via the inner shaft passage 53, and the lubricating oil that lubricates the rearmost bearing 54 lubricates the front bearing 55 via the outer shaft passage 56. The lubricating oil supply structure is configured so that it returns.

Further, there is an invention described in Japanese Patent Application Laid-Open No. 62-110595 as a prior art of a stern tube bearing for a counter-rotating propeller, and the invention described in this publication is an inner side from a passage provided at an axial center of an inner propeller shaft. By arranging multiple oil supply holes that radially pass through the outer peripheral surface of the propeller shaft in multiple rows in the longitudinal direction of the inner propeller shaft, metal contact during low speed operation is prevented and the bearing due to partial contact of the rear end of the bearing It prevents seizure.

[0007]

However, similarly to any of the above-mentioned prior arts, the lubricating oil supplied from the shaft end is supplied from the oil supply shaft passage 53 provided in the inner propeller shaft 52 to the inner propeller shaft 52. Lubricate the rear bearing 54 that supports the
Since the structure is such that the front bearing 55 is lubricated back through the off-axis passage 56, a long oil supply passage is provided in the inner propeller shaft 52 at its axial center, and this passage and the inner propeller shaft 5 are provided.
It is necessary to provide an in-shaft passage 53 that is a passage that connects the two surfaces. Therefore, it takes a lot of time and cost to process the axial passage 53 for refueling.

Further, in the stern tube bearing described in Japanese Patent Laid-Open No. 62-110595, since the pressure oil radially supplied from the inner propeller shaft is supplied to the inner surface side of the bearing, the bearing material is soft. High-pressure lubricating oil is injected toward the material, which may cause early wear of the surface of the bearing material, causing a problem in bearing life.

In view of the above problems, it is an object of the present invention to provide a lubricating oil supply device for a contra-rotating propeller for a marine vessel, which can easily process a lubricating oil system and does not adversely affect bearing materials.

[0010]

In order to achieve the above-mentioned object, a lubricating oil supply device for a marine counter-rotating propeller according to the present invention reverses coaxially with a hollow outer propeller shaft and within the outer propeller shaft. In a lubricating oil supply device for a marine counter-rotating propeller having an inner propeller shaft, wherein a plurality of bearings for supporting the inner propeller shaft are provided in a gap between the outer propeller shaft and the inner propeller shaft, between the plurality of bearings. A lubricating oil passage is formed by providing a cylindrical member that radially divides a gap between the inner propeller shaft and the outer propeller shaft.

[0011]

With the above structure, when the lubricating oil is supplied to the space between the outer propeller shaft and the inner propeller shaft, the lubricating oil supports the inner propeller shaft through one of the lubricating oil passages divided by the cylindrical member. The lubricating oil supplied to the sliding surface between the plurality of bearings and the inner propeller shaft, which lubricates the sliding surface, is discharged through the other lubricating oil passage divided by the cylindrical member.

Therefore, the lubricating oil passage for lubricating the bearing can be easily formed by the cylindrical member provided in the gap between the inner propeller shaft and the outer propeller shaft.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side sectional view showing a first embodiment of a lubricating oil supply device, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG.

As shown in the figure, an outer propeller shaft 2 for driving the front propeller 1 and an inner propeller shaft 4 for driving the rear propeller 3 in the inside of the outer propeller shaft 2 in a reverse direction have an annular space S. The outer propeller shaft 2 is rotatably supported by a stern tube bearing 5a of a stern tube 5 provided on the hull H, and the inner propeller shaft 4 has an inner propeller shaft 4 inside the bow side of the outer propeller shaft 2 and the front propeller 1. It is rotatably supported by a bearing 6 provided inside the boss.

A cylindrical member 7 is provided in the space S between the inner propeller shaft 4 and the outer propeller shaft 2 so as to extend between the two bearings 6. The cylindrical member 7 allows the outer propeller shaft to be rotated as shown in FIG. The outer passage 8 is formed between the inner surface of the outer peripheral surface 2 and the inner surface of the inner peripheral surface of the cylindrical member 7, and the inner space 9 is formed between the inner surface of the cylindrical member 7 and the outer surface of the inner propeller shaft 4 in the radial direction. A passage W is formed.

As shown in the sectional view of FIG. 3, the bearing 6 is formed with four oil grooves 6a in the axial direction of the outer periphery so as to communicate with the outer passage 8 provided in the cylindrical member 7. Four oil holes 6b penetrating from the oil groove 6a toward the inner surface of the bearing 6 are formed. Further, four oil passages 6c are formed in the axial direction of the outer circumference deviated from the position of the oil groove 6a by approximately 45 ° in the circumferential direction. The bearing 6 and the cylindrical member 7 are internally attached to the outer propeller shaft 2 so as to make the same rotational movement as the outer propeller shaft 2.

Further, on the inside of the hull, an oil supply box 10 for supplying and discharging lubricating oil is provided around the outer circumference of the outer propeller shaft 2. The oil supply box 10 is lubricated from the fixed side to the rotating side. The oil supply side I communicates with an outer passage 8 formed by the cylindrical member 7 through an oil supply hole 2a formed in the outer propeller shaft 2, and the oil drain side O has an outer propeller shaft. It communicates with the inner passage 9 formed by the cylindrical member 7 through the oil drain hole 2b formed in 2 and the communication hole 7a formed in the cylindrical member 7. In addition,
Reference numeral 11 is a seal member that seals the outer propeller shaft 2 and the inner propeller shaft 4, and 12 is a seal member that seals the front and rear ends of the stern tube 5. Further, although the stern tube 5 is drastically shortened in the drawing in FIG. 1, it actually has a predetermined length as shown in FIG. 11 because of the necessity of supporting the outer propeller shaft 2.

The flow of lubricating oil in the first embodiment is as follows.
As shown in the side sectional view showing the flow of the lubricating oil in FIG. 4, the lubricating oil supplied from the oil supply side I of the oil supply box 10 mounted on the outer periphery of the outer propeller shaft 2 passes through the oil supply hole 2 a of the outer propeller shaft 2. It flows to the outer passage 8 formed on the outer periphery of the cylindrical member 7, and is supplied to the bow-side and stern-side bearings 6 along the outer passage 8. The lubricating oil supplied to the bearing 6 is jetted to the sliding surface between the inner propeller shaft 4 and the bearing 6 through the oil groove 6a and the oil hole 6b formed in the circumferential direction of the bearing 6, and the lubricating oil is discharged. Thus, an oil film is formed between the inner propeller shaft 4 and the bearing 6 which is a sliding bearing.

The lubricating oil flowing from the space between the bearing 6 and the inner propeller shaft 4 to the bow side passes through the oil passage 6c formed on the outer periphery of the bearing 6 and the inner passage of the space S divided by the cylindrical member 7. 9 and the lubricating oil flowing from the bearing 6 to the inner passage 9 through the communication hole 7a formed in the cylindrical member 7 and the oil drain hole 2b formed in the outer propeller shaft 2 Emitted from side O. In this way, the lubricating oil passage W formed in the space S between the outer propeller shaft 2 and the inner propeller shaft 4 lubricates the bearing 6 that supports the inner propeller shaft 4.

Next, a second embodiment in which an oil passage for lubricating oil is provided on the inner propeller shaft will be described with reference to the side sectional view showing the lubricating oil supply device of FIG. 5 and the CC sectional view of FIG. To do. In addition,
The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the figure, this second embodiment is an embodiment in which the oil discharge system of the above-mentioned first embodiment is modified, and the second embodiment
As shown in the sectional view of FIG. 6, in the bearing 16 in the embodiment, four oil grooves 16a are formed in the outer peripheral axial direction so as to communicate with the outer passage 8 formed by the cylindrical member 7. Four oil holes 16b penetrating from the oil groove 16a toward the inner surface of the bearing 16 are formed. Then, on the bow side and the stern side of the inner propeller shaft 4 in which the bearing 16 is located, a communication hole 4a provided at the axial center of the inner propeller shaft 4,
An oil passage 4c is formed by the vertical hole 4b provided from the communication hole 4a toward the surface of the inner propeller shaft 4. The bearing 16 and the cylindrical member 7 are internally attached to the outer propeller shaft 2 so as to make the same rotational movement as the outer propeller shaft 2 as in the first embodiment.

The flow of the lubricating oil in the second embodiment is
Explaining based on the side sectional view showing the flow of the lubricating oil in FIG. 7, the lubricating oil supplied from the oil supply side I of the oil supply box 10 mounted on the outer periphery of the outer propeller shaft 2 is the same as in the first embodiment described above. , Flows through the oil supply hole 2a of the outer propeller shaft 2 to the outer passage 8 formed on the outer periphery of the cylindrical member 7, and is supplied to the bearings 16 on the bow side and the stern side along the outer passage 8 to the bearing 16. The supplied lubricating oil is jetted to the sliding surface of the inner propeller shaft 4 and the bearing 16 through the oil groove 16a and the oil hole 16b formed in the bearing 16, and the lubricating oil causes the inner propeller shaft 4 and An oil film is formed between the sliding bearing and the bearing 16.

The lubricating oil flowing from the space between the bearing 16 and the inner propeller shaft 4 to the bow side passes through the oil passage 4c formed in the inner propeller shaft 4 and inside the space S divided by the cylindrical member 7. The drainage of the oil supply box 10 is performed through the communication hole 7a formed in the cylindrical member 7 and the oil drain hole 2b formed in the outer propeller shaft 2 together with the lubricating oil flowing into the passage 9 from the bearing 16 to the inside passage 9. It is discharged from the oil side O. In this way, the lubricating oil passage W formed in the space S between the outer propeller shaft 2 and the inner propeller shaft 4 lubricates the bearing 16 that supports the inner propeller shaft 4.

In this embodiment, the oil passage 4c formed on the inner propeller shaft 4 may be of any size as long as it allows the bow side and the stern side of the bearing 16 to communicate with each other.
Since only the both end portions are processed, a great deal of time and labor required in the past are not required.

The oil groove 6a (16a) and the oil hole 6b formed in the bearing 6 (16) in the first and second embodiments.
The number of (16b) and the like is not limited to four, and the required number may be appropriately selected depending on the size of the bearing and the like.

Furthermore, according to the first and second embodiments, the supply of the lubricating oil can be supplied to the inner propeller shaft 4 side from the oil hole 6b (16b) penetrating in the radial direction of the bearing 6 (16). If a hydrostatic bearing that requires direct pressure oil supply to the sliding surface between the inner propeller shaft 4 and the bearing 6 (16) is adopted, the lubricating oil injected at high pressure will not flow toward the soft bearing material. Since it is injected to the surface of the inner propeller shaft 4 without being injected, the surface of the bearing material is not abraded by the injection of lubricating oil, and the lubricating oil supply device is very suitable for a hydrostatic bearing.

By the way, in the above-mentioned first and second embodiments, the lubricating oil is directly supplied from the oil hole 6b (16b) formed in the bearing 6 (16) to the sliding surface with the inner propeller shaft 4. However, a third embodiment for supplying lubricating oil from the lubricating oil passage W to the sliding surface between the inner propeller shaft 4 and the bearing 26 will be described below with reference to the side sectional view shown in FIG. In addition, in the third embodiment, the flow of the lubricating oil is in the opposite direction to the above-described first and second embodiments. In addition, in this third embodiment, an example applied to the configuration of the first embodiment described above is shown.
In the following description, only the configuration different from that of the above-described first embodiment will be described, the same configurations will be denoted by the same reference numerals, and detailed description will be omitted.

This third embodiment is an embodiment in which the bearing 6 in the above-mentioned first embodiment is modified, and as shown in the drawing,
In the axial direction of the outer circumference of the bearing 26 in the third embodiment, the oil groove 2 is formed so as to communicate with the outer passage 8 formed by the cylindrical member 7.
6a is formed, and the oil groove 26a is formed so as to penetrate the bearing 26 in the width direction. The bearing 26 and the cylindrical member 7 are internally attached to the outer propeller shaft 2 so as to make the same rotational movement as the outer propeller shaft 2.

According to the third embodiment, the lubricating oil supplied from the oil supply side I of the oil supply box 10 mounted on the outer periphery of the outer propeller shaft 2 is supplied with the oil supply hole 2a of the outer propeller shaft 2 and the cylindrical member 7.
Through the communicating hole 7a formed in the inner propeller shaft 4 to the inner passage 9 formed by the cylindrical member 7, and is supplied to the sliding surfaces of the bow and stern side bearings 26 along the inner passage 9 to form the inner propeller shaft 4 And a bearing 26 which is a slide bearing.

The lubricating oil flowing from the space between the bearing 26 and the inner propeller shaft 4 to the bow side passes through the oil groove 26a formed on the outer periphery of the bearing 26 to the outer passage 8 formed by the cylindrical member 7. The oil flows from the oil discharge side O of the oil supply box 10 through the oil discharge hole 2b formed in the outer propeller shaft 2. In this manner, the lubricating oil passage W formed in the space S between the outer propeller shaft 2 and the inner propeller shaft 4 lubricates the bearing 26 that supports the inner propeller shaft 4.

Next, a fourth embodiment in which a rolling bearing is adopted as a bearing for supporting the inner propeller shaft 4 will be described with reference to the side sectional view shown in FIG. Since the fourth embodiment shows an example applied to the configuration of the second embodiment described above, only the configuration different from the second embodiment described above will be described, and the same reference numerals are given to the same configurations. Is attached and detailed description is omitted.

This fourth embodiment is an embodiment in which the bearing 16 in the above-mentioned second embodiment is changed to a rolling bearing,
As shown in the drawing, the inner surface of the outer propeller shaft 2 located on the outer periphery of the bearing 36 and the inner surface of the front boss 1 of the front propeller 1 have an outer passage 8 formed by a cylindrical member 7 and an oil hole of the bearing 36 in the axial direction thereof. Communication grooves 2c, 1 for communicating with 36b
a is formed, and the communicating grooves 2c and 1a allow the lubricating oil in the outer passage 8 to pass through the oil hole 36b in the bearing 36 and the bearing 3
6 is configured to be supplied.

According to the fourth embodiment, the lubricating oil supplied from the oil supply side I of the oil supply box 10 mounted on the outer periphery of the outer propeller shaft 2 passes through the oil supply hole 2a of the outer propeller shaft 2 and is guided by the cylindrical member 7. The lubricating oil flowing to the formed outer passage 8 and flowing to the bow side and the stern side along the outer passage 8 is supplied from the communication grooves 2c and 1a to the oil hole 36b of the bearing 36.

The lubricating oil flowing from the bearing 36 to the bow side flows through the oil passage 4c formed in the inner propeller shaft 4 to the inner passage 9 divided by the cylindrical member 7,
The lubricating oil flowing from the bearing 36 to the inner passage 9 is discharged from the oil discharge side O of the oil supply box 10 through the communication hole 7a formed in the cylindrical member 7 and the oil discharge hole 2b formed in the outer propeller shaft 2. .

As described above, the outer propeller shaft 2 is supported by the stern tube bearing 5a of the stern tube 5 provided on the hull H, but the stern tube bearing 5a is also lubricated by a lubricating oil supply device (not shown). Oil is being supplied. Therefore, the bearing 6 (16, 26, 26) of the inner propeller shaft 4 described above is
36), the stern tube bearing 5a also needs a lubricating oil supply system.

Therefore, based on the side sectional view of the lubricating oil supply apparatus shown in FIG. 10, a fifth embodiment in which the bearing supporting the inner propeller shaft 4 is lubricated with lubricating oil to lubricate the stern tube bearing 5a as well. explain. Since the fifth embodiment shows an example applied to the configuration of the first embodiment described above, only the configuration different from the first embodiment described above will be described, and the same reference numerals are given to the same configurations. Is attached and detailed description is omitted.

In the fifth embodiment, the lubricating oil that lubricates the bearing 6 supporting the inner propeller shaft 4 as in the first or second embodiment described above is supplied from the inner passage 9 formed by the cylindrical member 7 to the cylinder. After discharging to the stern tube 5 portion through the communication hole 7a of the member 7 and the oil drain hole 2b of the outer propeller shaft 2, the stern tube bearing 5a is lubricated with this lubricating oil, and then the oil passage 13 provided in the hull H is The oil is discharged to the oil drain side O via the

In the case of the fifth embodiment, the refueling box 10 may have only the refueling side I, and the oil passage 13 can be easily provided because it is provided on the fixed side of the hull H.

When lubricating the stern tube bearing 5a with the lubricating oil of the inner propeller shaft 4 as in this embodiment, it is necessary to consider the pressure of the lubricating oil suitable for lubricating the respective bearings.

As described above, according to the present invention, it is possible to supply the lubricating oil from the outer periphery of the outer propeller shaft 2 located on the rear side of the ship, and to connect the outer propeller shaft 2 and the inner propeller shaft 4 to each other. A cylindrical member 7 provided in the space S is internally laid so as to make the same rotational movement as the outer propeller shaft 2, and the cylindrical member 7 divides the space S to supply a lubricating oil passage W for supplying and discharging oil to the bearing. Since it is formed, it is not necessary to provide a long in-shaft passage over the axial center of the long inner propeller shaft 4 as in the prior art, and the time and cost required for machining the inner propeller shaft 4 are significantly reduced as compared with the related art. be able to.

Although any of the above-described embodiments uses the tubular cylindrical member 7, it is not limited to the tubular shape as long as it divides the space S to form the lubricating oil passage W. Absent.

In each of the above-described embodiments, the direction of lubricating oil supply and drainage is specified, but it is appropriately selected depending on the pressure of the lubricating oil, the bearing (sliding bearing or rolling bearing) that supports the inner propeller shaft, and the like. do it.

[0043]

According to the present invention, it is not necessary to provide an axial center of a long inner propeller shaft and an axial passage for communicating this axial center with the shaft surface, and the time and labor required for machining these are greatly reduced. Can be reduced.

When a hydrostatic bearing is used for the bearing of the inner propeller shaft, it becomes possible to supply the lubricating oil from the bearing side to the inner propeller shaft side, and the lubricating oil injected at high pressure is the bearing material. Since the injection is made toward the shaft side without being injected toward the soft material, the surface of the bearing material is not worn by the injection of the lubricating oil.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of a lubricating oil supply device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a side sectional view showing a flow of lubricating oil according to the first embodiment of FIG.

FIG. 5 is a side sectional view showing a second embodiment of the lubricating oil supply apparatus according to the present invention.

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a side sectional view showing a flow of lubricating oil according to the second embodiment of FIG.

FIG. 8 is a side sectional view showing the flow of lubricating oil in the third embodiment of the lubricating oil supply device according to the present invention.

FIG. 9 is a side sectional view showing a flow of lubricating oil in the fourth embodiment of the lubricating oil supply apparatus according to the present invention.

FIG. 10 is a side sectional view showing a flow of lubricating oil in the fifth embodiment of the lubricating oil supply apparatus according to the present invention.

FIG. 11 is a side sectional view showing a conventional lubricating oil supply structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Front propeller 2 ... Outer propeller shaft 2a ... Oil supply hole 2b ... Oil discharge hole 3 ... Rear propeller 4 ... Inner propeller shaft 4c ... Oil passage 5 ... Stern pipe 6, 16, 26, 36 ... Bearing 6a, 16a, 26a ... Oil groove 6b, 16b, 36b ... Oil hole 6c ... Oil passage 7 ... Cylindrical member 7a ... Communication hole 8 ... Outer passage 9 ... Inner passage 10 ... Refueling box H ... Hull S ... Void I ... Refueling side O ... Discharging side W ... Lubricant passage

Claims (1)

[Claims] 1. A plurality of hollow outer propeller shafts, and an inner propeller shaft that is coaxially inverted in the outer propeller shaft, and supports the inner propeller shaft in a space between the outer propeller shaft and the inner propeller shaft. In a lubricating oil supply device for a marine counter-rotating propeller equipped with a bearing, a cylindrical member that radially divides a gap between an inner propeller shaft and an outer propeller shaft is provided between the plurality of bearings to form a lubricating oil passage. A lubricating oil supply device for a contra-rotating propeller for a marine vessel.