JPH01237289A - Device for driving contra-rotating propeller - Google Patents

Abstract

PURPOSE:To lubricate and cool inner shaft supporting bearings provided in an annular space by making lubricating oil flow from a driving side to a propeller side along the annular space between an inner shaft and an outer shaft. CONSTITUTION:Lubricating oil sent out of a sub-tank passes through a feeding passage 140 and comes to an oil chamber Y2 from the seal-ring fixing cylinder 130 of a seal ring device A and to an oil sump chamber 141 via an oil hole 142. Then, after flowing from the oil sump space 141 to a driving portion side through the oil passage 143 of a seal liner 131 and the oil passage 144 in a loose coupling 136, the oil is introduced in the radially inner direction in the oil passage 145 of the side board 137 of a seal device C and, then flows into an annular space 17 to circulatingly cool bearings 6, 8 positioned therein. The lubricating oil passed through the bearing 8 flows from a connecting chamber 123 into a through hole 150 via the oil passage 153 of a propeller boss 113 and the inside of a propeller cap 153, to be returned to the sub-tank through a discharge passage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a counter-rotating propeller drive device mainly used for ships.

[Prior Art] Conventionally, as a technology related to a counter-rotating propeller drive device, for example, Japanese Patent Application Laid-Open No. 139795/1988 [Bearing for a Marine Counter-Rotating Propeller Shaft System and its Device] has been proposed.

This prior art example will be explained with reference to FIG.
The inner shaft 2 coaxially penetrates inside the hollow outer shaft l, the outer shaft 1 is rotatably supported by outer shaft support bearings 4 and 5 against the stan frame 3, and the inner shaft 2 is rotatably supported by the outer shaft supporting bearings 4 and 5. It is rotatably supported by inner shaft support bearings 6, 7, and 8 relative to l,
By engaging the inner shaft 2 and the outer shaft l with reversing gears 9, tO, and 11, they are configured to be in a reversing drive state in which they rotate in opposite directions. 12
A propeller boss 13 is fixed to the outboard end of the outer shaft l.
The propeller boss 15 of the bow propeller 14 is a fixed counter-rotating propeller shaft system, and the inner shaft support bearing 7 is a so-called thrust bearing.

Further, between the stern frame 3 and the outer shaft l, there are seal devices A-B located on the bow side and the stern side, respectively, for sealing the space 16 between the stern frame 3 and the outer shaft l.
A sealing device is provided between the outer shaft 1 and the inner shaft 2, located on the bow side and the stern side, respectively, for sealing the annular space 17 between the outer shaft 1 and the inner shaft 2. CD is provided.

The sealing device C seals between the bow side end of the outer shaft l and the outer peripheral surface of the inner shaft 2, and the sealing device HD includes:
Propeller boss fixed to the outer shaft! 5 and a propeller boss 13 fixed to the inner shaft 2. This sealing device is called an outboard inversion sealing device.

In the space 16, outer shaft supporting bearings 4 and 5 for rotatably supporting the outer shaft l are arranged between the seal devices A and B, and are filled with lubricating oil. ,
The annular space 17 is also arranged with inner shaft supporting bearings 6, 7, and 8, and is filled with lubricating oil.

Next, the lubricating oil supply system will be explained. The lubricating oil supply system is divided into two parts: an inner shaft side and an outer shaft side.

In the outer shaft side lubricating oil circulation system, a lubricating oil supply passage 21 is drawn out from the lower part of the gravity tank 20 at a predetermined height, and its tip passes through the stan frame 3 and is connected to the space 16. The oil supply connection point is near the outer shaft support bearing 5 on the stern side, and on the bow side of the space 16, a block is provided with a discharge passage 22 adjacent to the sealing device A for discharging lubricating oil. 23 and are connected to each other. A pump 24 is provided in the middle of the discharge passage 22 to circulate the lubricating oil back to the gravity tank 20.

In the inner shaft side lubricating oil circulation system, a long oil passage 30 is bored in the center of the inner shaft 2 along the axial direction, and the bow side of the oil passage 30 is connected to a lubricating oil supply passage 31, and the oil passage 30 is connected to a lubricating oil supply passage 31. Road 3
The stern side of 0 is an oil passage 32 provided seven times in the radial direction of the inner shaft 2.
is connected to the annular space 17 between the inner shaft 2 and the outer shaft l, and in this case, the position of the oil passage 32 opening to the inner shaft 2 is inside the reversing seal device on the stern side. . Further, the bow side end of the annular space 17 is connected to an oil passage 33 opened in the inner wall of the outer shaft l in the axial and radial directions, and this oil passage 33 is connected to an oil passage passing through the sealing device A. It is connected to the discharge passage 34 via the discharge passage 34 . Furthermore, the lubricating oil supply passage 31
The configuration is such that pumps 35 and 36, a sump tank 37, and a cooler 38 are interposed between the pumps 35 and the discharge passage 34, and are connected in series.

Furthermore, to explain the lubricating oil circulation system, the lubricating oil supplied from the lubricating oil supply passage 21 to the space 16 passes through the outer shaft support bearing 5 on the stern side, and advances through the space 16 toward the bow side.
After passing through the outer shaft support bearing 4 on the bow side, the sealing device A
is discharged from the adjacent block 22 to the discharge passage 22 and returned to the gravity tank 20. Furthermore, the lubricating oil sent out from the sump tank 37 through the supply passage 31 passes through the oil passage 30 and the oil passage 32 of the inner shaft 2 to the stern side end of the annular space 17 between the inner shaft 2 and the outer shaft l. As it flows through the annular space 17 from the stern side to the bow side, it lubricates the bearings 8, 7, and 6 in this order, reaches the bow end of the annular space 17, and the oil passage opened in the outer shaft l. 33 and sealing device A to the discharge passage 34, and is circulated again to the sump tank 37 to supply lubricating oil to each bearing and to cool it.

[Problems to be Solved by the Invention] However, in this conventional technology, the holes are formed in the outer shaft and the inner shaft, and the order in which the lubricating oil is inserted is as shown by the arrows in FIG. Based on the movement from the center of the inner shaft to the outer sealing device, the following problems remain to be improved.

(1) Since the oil passage 32 is opened in the shape of a horizontal hole on the stern side of the inner shaft 2, stress concentration is likely to occur due to rotation or curvature of the inner shaft 2, so the shaft diameter of the inner shaft 2 is partially increased. It is necessary to take measures such as

(2) Oil passage 3 along the axial direction on the wall of the hollow outer shaft 1
3, which requires advanced processing technology, and the walls tend to become thicker.

(3) Since the lubricating oil passes through the vicinity of the reverse seal device on the stern side and then lubricates and cools the bearings 8, 7, and 6, in the event that seawater enters from the reverse seal device, the seawater The mixed lubricating oil will come into contact with the bearings 8, 7, and 6, causing damage.

The present invention effectively solves the problems of the prior art described above. In other words, holes in the outer and inner shafts are kept to a minimum to prevent stress concentration, thereby improving strength and workability. The purpose is to ensure the integrity of the bearings by discharging seawater without directly guiding it to the bearings even if it does enter the bearings.

[Means for Solving the Problems] A counter-rotating propeller drive device according to the present invention has an inner shaft and an outer shaft coaxially arranged to drive two propellers in reverse, and a drive section between the inner shaft and the outer shaft. An annular space is formed through which lubricating oil flows from the propeller side to the propeller side, and an oil passage is connected to the annular space on the propeller side of the inner and outer shafts and flows the lubricating oil from the propeller side to the drive unit side in the axial direction inside the inner shaft. A four-structure structure is formed in which a bearing for supporting the inner shaft is disposed in a surface annular space, or an opening on the propeller side in the oil passage inside the inner shaft and an annular space are formed in the annular space. In addition, a sealing device is provided to close the opening on the driving part side in the annular space, and the sealing device has the annular space and The structure has an additional technical requirement of radially arranging oil passages that communicate with the lubricating oil supply system.

[Operation] By flowing lubricating oil from the drive side to the propeller side along the annular space between the inner and outer shafts, each inner shaft support bearing arranged in the annular space is lubricated and cooled. By introducing lubricating oil into the inner shaft through the vicinity of the sealing device with the outside, contact between seawater and the inner shaft support bearing is prevented.

Since the oil passage inside the propeller boss is communicated with the oil passage inside the inner shaft, there is no need to make a hole in the inner shaft in the radial direction.

Furthermore, a communication path with the lubricating oil supply system is formed in the sealing device that closes the opening on the drive side in the annular space, so that there are no holes extending from the annular space to the outer shaft surface.

[Embodiment] Hereinafter, an embodiment of a counter-rotating propeller drive device according to the present invention will be described with reference to FIGS. 1 to 3. In this embodiment, parts common to those in FIG. 4 described as the prior art are given the same reference numerals to simplify the explanation.

In this embodiment, each bearing 4, 5, and
6, 7, and 8 are located close to each other, and that the sealing devices A, B, and CXD of the rotating parts are arranged, it is similar to the prior art example, but the specific groove structure of the inner shaft 102 and the sealing device C-
D. The structure of the lubricating oil supply system is different. Furthermore, in the following description, the direction of a drive unit such as an engine to which the inner shaft 102 is connected will be referred to as the drive unit side instead of the bow side, and the opposite direction will be referred to as the propeller side instead of the stern side.

The sealing device has an annular space 1 as shown in FIG.
The seal ring fixing cylinder 116 is attached to the propeller boss 113 at intervals so as to surround the inner shaft +02, and the seal ring fixing cylinder 11 [) and inner shaft 1
02 and a seal liner +17 attached to the end of the propeller boss 15; and the seal liner 117.
A plurality of seal rings 118, +19, and 120 are attached to the inner surface of the seal ring fixing cylinder 116 in slidable and elastic contact with the surface of
It is equipped with an oil chamber YO and a pressure buffer chamber +21 formed between +19 and +120. Lubricating oil is supplied to the oil chamber YO, and the seal ring 120 is brought into direct contact with seawater, so that the pressure buffer chamber 12! A mixture of seawater and lubricating oil is stored inside the tank.

Note that a space between the propeller boss ttS and the seal ring 118 is a communication chamber 123 with the annular space 17, and the lubricating oil that has passed through the inner shaft support bearings 6, 7, and 8 reaches therebetween. In addition, the above seal rings 118, 119, 120
The shape and orientation of the seal are set as shown in FIG. 2, so that when a pressure difference occurs, the seal can be elastically deformed in one direction to provide a sufficient sealing effect.

Next, the sealing device A will be explained. As shown in FIG. Block 23 in stun frame 3 surrounding
a seal ring fixing tube 130 that is attached via;
A cylindrical seal liner 131 disposed between the seal ring fixing tube 130 and the outer shaft l so as to face the inner peripheral surface of the seal ring fixing tube 130, and the cylindrical seal liner +3.
A plurality of (four in the illustrated example) seal rings 132, 133, 134, and 135 are attached to the seal ring fixing cylinder 130 in slidable and elastic contact with the surface of the seal ring 130,
It is equipped with oil chambers Y1-Y2 and Y3 formed between the seal rings 132, 133, 134, and 135, and a loose coupling 136 that is brought into close contact with the cylindrical seal liner 131 in a fluid-tight manner. be. In addition, the shape and orientation of each seal ring 132, 133, 134, 135 are as follows:
With the setting as shown in FIG. 3, when a pressure difference occurs, a sufficient sealing effect can be achieved by elastic deformation in one direction. And each oil chamber Y1・
In Y2 and Y3, the central oil chamber Y2 is for supplying lubricating oil to the inner shaft support bearings 6, 7, and 8, and the oil chambers Yl-Y on both sides are for supplying lubricating oil to the inner shaft support bearings 6, 7, and 8.
3 is used for filling oil for another purpose.

The loose coupling 136 connects the reversing gear 11 and the outer shaft l, and the loose coupling 1
A side plate 137 that is in close contact with each other in a liquid-tight manner is disposed adjacent to the side plate 36 to constitute a sealing device C that closes the opening of the annular space 17 on the drive unit side.

Next, the lubricating oil supply system and circulation system will be explained.

The lubricating oil supply system and circulation system for the outer shaft support bearings 4 and 5 and the inner shaft support bearings 6, 7, and 8 are divided as shown in Figure 1, and the outer shaft side lubricating oil supply system Since the lubricating oil supply system and circulation system are based on the conventional example, their explanation will be omitted, and only the inner shaft side lubricating oil supply system and circulation system will be explained here.

As shown in FIG. 3, the inner shaft side lubricating oil supply system and circulation system pass through the seal ring fixing cylinder 130 of the seal device A, and the sump tank 37 and the oil chamber Y2 are connected to the lubricating oil supply passage 140. An oil reservoir space 141 is formed between the cylindrical seal liner 131 and the outer circumferential surface of the outer shaft l.
This oil sump space 141 and oil chamber Y2 are communicated with each other by an oil hole 142, and a loose coupling 136 is connected to this oil sump space 141 through an oil passage 143 formed inside the cylindrical seal liner 131. An oil route opened inside! 44
This oil passage 144 is connected to the side [
137 is connected to the annular space 17 between the inner shaft 102 and the outer shaft l via an oil passage 145 opened in the radial direction. Therefore, the lubricating oil supplied from the lubricating oil supply passage 140 passes through these connected oil passages.
It is supplied from the drive unit side end of the annular space 17, bypassing the drive unit side end of the outer shaft l, and is inserted into the propeller side along the annular space 17.

On the other hand, in the inner shaft 102, a through hole 150 that penetrates in the axial direction is formed at the center of the interior, and a thin tube 151 is inserted into the inside of the through hole 150. The internal space formed in the cap 152 is connected to the oil chamber 123 in the sealing device via an oil passage 153 opened in the propeller boss 113. Therefore, the end of the annular space 17 on the propeller side communicates with the through hole 150 via the oil chamber 123. Further, the drive unit side of this through hole 150 is connected to the first
As shown in the figure, it is connected to the sump tank 37 via a discharge passage 154, thereby forming a closed loop.

Also, the n-through hole of the inner shaft 102! Thin tube inserted into 50+5
As shown in FIG. 1, the drive unit side end of the thin tube +51 is connected to the gravity tank 155 by a supply passage 156, and the propeller side end of the thin tube +51 is connected to the propeller as shown in FIG. It is connected to the oil chamber YO between the seal rings +18 and 119 through an oil pipe 157 provided in the cap 152, an oil passage 158 opened in the propeller boss 113, and an oil passage 159 opened in the seal ring fixing cylinder 116. , lubricating oil from the gravity tank +55 can be supplied to the oil chamber YO at a predetermined pressure.

With the counter-rotating propeller drive device configured in this way, the lubricating oil sent out from the sump tank 37 is
As shown in FIG. 3, the supply passage 140 leads from the seal ring fixing cylinder 130 of the sealing device A to the oil chamber Y2, and reaches the oil sump space 14+ via the oil hole 142, as well as this oil sump space 141. From the oil passage 143 in the seal liner +31, the oil passage 14 in the loose coupling 136
4 flows to the drive part side, and then the sealing device C side Fi, 13
The oil passage 145 of No. 7 is guided radially inward, and the annular space 17
The air flows into the air, circulates and cools the bearings 6, 7, and 8 located therein before reaching the reversing sealing device. In other words,
Since the lubricating oil reaches the seal device after lubricating and cooling the bearings 6, 7, and 8, it is possible to avoid contamination of impurities such as seawater during the lubricating and cooling.

The lubricating oil that has passed through the bearing 8 is then transferred from the communication chamber 123 to the oil passage 153 of the propeller boss 113 and to the propeller cap 1.
52, is guided to the through hole +50 of the inner shaft 102, and then flows through the through hole 150 from the propeller side to the drive unit side, and as shown in FIG. +54 and returned to the sump tank 37.

In this way, the lubricating oil lubricates the inner shaft support bearings 6, 7, and 8 in this order, and then passes through the sealing device I), so even if seawater enters from the sealing device, the bearings 6, 7, and By returning the water to the sump tank 37 and intervening a cooler 38, a purifier, etc., it is possible to perform separation processing without directly affecting the water.

Then, the lubricating oil flows from the annular space 17 to the propeller boss 11.
3 and then connects to the propeller side opening of the through hole 150, so it is necessary to open the through hole 150 in the axial direction in the inner shaft 102.
There is no longer anything that corresponds to the radial oil passage 32 in the illustrated example,
In other words, it is possible to eliminate the occurrence of stress concentration points, and there is no need for advanced drilling work such as intersecting vertical holes and horizontal holes. In addition, in the sealing device, the seal ring fixing cylinder +16 is fixed to the propeller boss 113 and oil is supplied to the oil chamber YO through the lubricating oil passage 158, which facilitates the supply of lubricating oil. ,
It is possible to improve sealing performance.

On the other hand, in the seal device C located on the drive unit side, lubricating oil is supplied to the opening in the annular space 17 on the drive unit side via an oil passage 145 opened in the radial direction in the side plate 137. , loose coupling 136 and side plate! Although it is necessary to open the oil passages 144 and 145 in the outer shaft 1, the oil passage 33 of the outer Ml in the example shown in FIG. Advanced hole drilling in the axial direction eliminates the need for additional work. Note that the loose coupling 136 and side [137 are
Since it is a so-called small part, drilling is excellent in workability, and it is possible to freely take measures for the strength of drilling.

[Effects of the Invention] As explained above, the counter-rotating propeller drive device according to the present invention provides the following effects.

(1) There is no need to provide an oil passage (horizontal hole) extending in the radial direction on the inner shaft, and stress concentration on the inner shaft can be prevented, making it possible to reduce the diameter of the inner shaft.

(2) There is no need to form an oil passage on the long outer shaft, making it easy to process the lubricating oil passage.

(3) Since the lubricating oil passes through the space between the inner and outer shafts and then is discharged through the flow path in the direction of the inner axis, if for example seawater intrudes from the sealing device on the propeller side, However, seawater does not directly enter the bearing between the inner and outer shafts, reducing the possibility of damage.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of a counter-rotating propeller drive device according to the present invention, Fig. 2 is an enlarged view of the ■ part in Fig. 1, and Fig. 3 is an enlarged view of the ■ part in Fig. 1. 4 are side sectional views of a conventional counter-rotating propeller drive device for ships. 1... Outer shaft, 3... Stan frame,
4, 5... Outer shaft support bearing, 6, 7, 8...
... Inner shaft support bearing, 9, 10-11 ... Reversing gear, 12 ... Propeller, 14 ...
Propeller, 15...Propeller boss, 16...
...Space, 17...Annular space, 102...
... Inner shaft, +13 ... Propeller boss, 123
...Communication chamber, 130...Seal ring fixing tube, 131...Tubular seal liner, 136
...Loose coupling, 137...
Side plate, 140... Lubricating oil supply passage, 141...
... Oil sump space, 142, 143 ... Oil hole,
143・144・・・Oil road, 150・・・・・・
Through hole, 151...Thin tube, 152...
Propeller cap, 153...Oil passage, 154.
...Lubricating oil discharge passage, 154...Drain passage, A-B-C-D...Seal device, YO/Y
l-Y2・Y3...Oil chamber. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] 1. An inner shaft and an outer shaft that drive two propellers in reverse are coaxially assembled to form an annular space between the inner shaft and the outer shaft that allows lubricating oil to flow from the drive section to the propeller side. , an oil passage that communicates with the annular space on the propeller side of the inner shaft and the outer shaft and allows lubricating oil to flow from the propeller side to the drive unit side is bored inside the inner shaft in an axial direction, A counter-rotating propeller drive device equipped with shaft support bearings. 2. The contra-rotating propeller according to claim 1, wherein the opening on the propeller side of the oil passage inside the inner shaft and the annular space are in communication via an oil passage formed inside the propeller boss. Drive device. 3. A claim characterized in that a sealing device is provided for closing an opening on the drive unit side in the annular space, and an oil passage is arranged in the radial direction to communicate the annular space and the lubricating oil supply system. A counter-rotating propeller drive device according to claim 1 or claim 2.