KR101313606B1 - Propulsion apparatus for ship, and ship having the same - Google Patents

Abstract

PURPOSE: A vessel propelling device and a vessel having the same are provided to enable the simplification of a power transmission system, to obtain stable mutual inversion of two propellers, and to facilitate manufacture and installation. CONSTITUTION: A vessel propelling device includes a front propeller (10), a rear propeller (20), and an inverse-rotation device (30). The front and rear propellers are coaxially arranged on the rear side of a hull (1). The inverse-rotation device is installed on a stern for inversely rotating the front and rear propellers. The inverse-rotation device includes a driving bevel gear, a driven bevel gear (32), and a plurality of inversed bevel gears (33). The driving bevel gear is installed inside a gear box (40) and connected to a rotary shaft (5) by a front connection device (50). The driven bevel gear is installed inside the gear box to be faced the driving bevel gear and connected to a hub (11) of the front propeller by a rear connection device (60). The inversed bevel gears installed inside the gear box inverting the rotation of the driving bevel gear and transmit to the driven bevel gear.

Description

[0001] PROPULATION APPARATUS FOR SHIP AND SHIP HAVING THE SAME [0002]

The present invention relates to a propulsion device for a ship in which two propellers rotate in opposite directions and generate propulsion force, and a ship equipped with the propulsion device.

A typical marine propulsion system has one helical propeller. However, the propeller with one propeller has a large energy loss since the rotational energy of the water flow due to the propeller's rotation cannot be used as the propulsion force.

Counter rotating propeller (CRP) can recover lost rotational energy as propulsion. In the double reversing propulsion system, two propellers installed on the same axis rotate propelling each other to generate propulsive force. The rotational energy of the fluid passing through the forward propeller is recovered by propulsive force while the propeller is rotating backward. Therefore, it is possible to exert a higher propelling performance than a propelling device equipped with one propeller.

However, since the dual inversion propulsion system includes the inverse rotation device and the hollow shaft which realize the opposite rotation of the two propellers, it is difficult to manufacture and install relatively, and the high technology level do.

US Patent Publication No. US2011 / 0033296 (published on Mar. 10, 2011) and Japanese Laid-Open Publication No. 62-279189 (published on December 04, 1987) have presented an example of the above- . US Patent Application Publication No. US2011 / 0033296 discloses a double reversing propulsion device having a hollow shaft and a planetary gear type reversing rotation device installed in a hull. Japanese Patent Application Laid-Open No. 62-279189 discloses a dual- A reversing propulsion device was proposed.

Patent Document 1: U.S. Published Patent Application No. US2011 / 0033296 (published on Mar. 10, 2011) Patent Document 2: JP-A-62-279189 (published on December 04, 1987)

Embodiments of the present invention are to provide a propulsion device for ships and a ship equipped with the propulsion device, which can realize stable mutual inversion of two propellers while simplifying the power transmission system as compared with the prior art.

The embodiments of the present invention are intended to provide a propulsion device for a ship capable of stably protecting gears implementing counter rotation of two propellers, and a ship equipped with the propulsion device.

According to an aspect of the invention, the rear propeller is fixed to the rotating shaft; A front propeller rotatably supported by the rotation shaft in front of the rear propeller; And a reverse rotating device for reversing the rotation of the rotating shaft and transferring the rotating shaft to the front propeller, wherein the reverse rotating device comprises: a driving bevel gear connected to the rotating shaft by a front connecting device; A driven bevel gear connected to the hub of the front propeller by a rear connection device; One or more inverted bevel gears for inverting the rotation of the driven bevel gear and transmitting the inverted bevel gear to the driven bevel gear; A gearbox mounted on the rear of the hull and having a gear accommodation space therein for receiving the driving bevel gear, the driven bevel gear, and the inverted bevel gear, wherein the gear box has an outer frame defining a circumference of the gear accommodation space; And an inner frame part provided in the outer frame part, the outer surface of which defines an inner side of the gear accommodation space and has a through hole through which the rotating shaft penetrates in a center thereof, and a connection part connecting the inner frame part and the outer frame part. At least one of the front connecting device and the rear connecting device may be provided with a marine propulsion device including a spline connecting part to allow axial displacement.

The gear box may further include a front cover attached to a front end of the outer frame portion to close the front of the gear accommodating space, and a rear cover attached to a rear end of the outer frame portion to close the rear of the gear accommodating space.

The front connection device may include a cylindrical front connection member rotatably supported outside the inner frame part, coupled to the driving bevel gear, and connected to the rotation shaft by the spline connection part.

The spline connection portion of the front connection device may include a spline portion provided on the inner surface of the front connection member, and a driving flange provided on the outer shaft so that the spline portion is engaged with the spline portion of the front connection member.

The spline connecting portion of the front connecting device is a splined portion provided on the outer surface of the front connecting member, a coupling ring coupled to the outer surface of the front connecting member and the splined portion provided on the inner surface of the front connecting member is fitted to the splined portion of the front connecting member, It may include a drive flange provided on the rotating shaft and connected to the connection ring by a plurality of connection bolts.

The spline connecting portion of the front connecting device is provided between the splined portion provided on the inner surface of the front connecting member, the splined portion provided on the outer surface of the rotating shaft, and the splined portion provided on the inner surface of the rotating shaft and the splined portion provided on the inner surface of the rotating shaft. It may include a connection ring is meshed with the splined portion of the splined portion provided on the outer surface is meshed with the splined portion of the front connection member.

The reverse rotation apparatus may include a front outer bearing installed between the front connection member outer surface and the front cover, and a front inner bearing installed between the front connection member inner surface and the inner frame part.

The rear connection device is rotatably supported outside the inner frame part and connected to the driven bevel gear cylindrical rear connection member, and a coupling flange coupled to the front propeller hub front surface and connected to the rear connection member by a spline connection part. It may include.

The spline connection portion of the rear connection device may include a spline portion provided on an outer surface of the rear connection member, and a spline portion provided on the connection flange to be engaged with the spline portion of the rear connection member.

The reverse rotation device may include a rear outer bearing installed between the rear connection member outer surface and the rear cover, and a rear inner bearing installed between the inner surface of the rear connection member and the inner frame part.

According to another aspect of the present invention, there may be provided a vessel having the aforementioned propulsion device.

The propulsion device according to the embodiment of the present invention can be installed in such a manner that the gear box of the reverse rotation device enters the installation space formed at the rear of the ship with the reverse rotation device manufactured and assembled from the outside of the ship, It can be easily performed.

In addition, the propulsion device according to the present embodiment can easily perform troubleshooting because the gearbox of the reverse rotation device can be separated from the hull when a failure occurs.

Also, in the propulsion device according to the present embodiment, since the reversing and rotating device is installed in the gear accommodating space between the outer frame part and the inner frame part of the gear box to rotate while the gears are fully accommodated, Can be protected.

In addition, since the propulsion device according to the present embodiment includes at least one of a front connecting device connecting the rotating shaft and the driving bevel gear and a rear connecting device connecting the driven bevel gear and the front propeller hub, the spline connecting part allows the axial displacement. The gears inside the gearbox can be stably protected even in the event of axial displacement of the rotating shaft or front propeller during the operation of the propulsion system.

In addition, since the propulsion device according to the present embodiment realizes the inversion of the front propeller by using a plurality of bevel gears, the volume of the propeller can be reduced and the configuration of the power transmission system can be simplified compared to a conventional planetary gear type reverse rotation device . In addition, since the volume of the inverting rotating device can be reduced, it is possible to install the inverting rotating device at the rear of the hull.

In addition, the propulsion device according to the embodiment of the present invention can eliminate the hollow shaft as in the conventional art by installing the reversing and rotating device on the rear side of the hull, so that the power transmission system can be simplified and the area required for lubrication can be reduced , It is possible to minimize the problems caused by lubrication.

1 is a sectional view showing a state in which a propulsion device according to an embodiment of the present invention is applied to a ship.
2 is a cross-sectional view of a propulsion device according to an embodiment of the present invention.
3 is an exploded perspective view of a propulsion device according to an embodiment of the present invention.
4 is an exploded perspective view of the inverting rotating device of the propulsion device according to the embodiment of the present invention.
5 is a detailed view showing a mounting structure of bearings for supporting a front propeller of a propulsion device according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating an installation example of an inversion rotation device of a propulsion device according to an embodiment of the present invention, in which the inversion rotation device is separated.
7 is a cross-sectional view illustrating a state in which an inversion rotating device of the propulsion device according to the embodiment of the present invention is installed in an installation space at the rear of the hull.
8 is a sectional view of the first sealing device of the propulsion device according to the embodiment of the present invention.
9 is an exploded perspective view of the first sealing device of the propulsion device according to the embodiment of the present invention.
10 is a cross-sectional view of a second sealing device of the propulsion apparatus according to the embodiment of the present invention.
11 and 12 show modified examples of the front connection device that can be applied to the propulsion device according to the embodiment of the present invention, respectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, a propulsion device for a ship according to an embodiment of the present invention includes a front propeller 10 and a rear propeller 20 which are arranged so that their axes coincide with the rear of the hull 1, And a reverse rotation device 30 provided on the rear end 3 of the hull 1 for realizing the opposite rotation of the front propeller 10 and the rear propeller 20. That is, the two propellers 10 and 20 rotate in opposite directions to generate propulsive force.

The rear end 3 of the hull 1 is a portion projecting rearward from the hull 1 in a streamlined manner for installing the front and rear propellers 10 and 20 and the reverse rotation device 30, ). The hull aft 3 may be made of casting and then fixed to the hull 1 by welding. And an installation space (4) penetrating front and back so as to accommodate the gear box (40) of the reverse rotation device (30) to be described later.

2 and 3, the reverse rotation device 30 includes a gear box 40 accommodated in a space for installing the rear end 3 of the hull 1, And a rotary shaft 5 rotatably supported on the gear box 40 in a penetrating state.

The reverse rotation device 30 is installed in the gear box 40 in a form opposed to the drive bevel gear 31 and the drive bevel gear 31 provided in the gear box 40 as shown in Figs. A driven bevel gear 32 and a plurality of inverted bevel gears 33 installed in the gear box 40 and for transmitting the rotation of the driven bevel gear 31 to the driven bevel gear 32 for transmission. The driven bevel gear 31, the driven bevel gear 32 and the inverted bevel gear 33 are installed to rotate in a state of being accommodated in the gear accommodating space 43 of the gear box 40. [ In addition, the reverse rotation device 30 connects the front connecting device 50 for connecting the rotating shaft 5 and the driving bevel gear 31, and the hub 11 of the driven bevel gear 32 and the front propeller 10. Rear connection device 60 is included.

The front end of the rotary shaft 5 protruding forward of the gear box 40 can be detachably coupled to the main drive shaft 6 inside the hull 1. 1, the main drive shaft 6 is connected to a drive source 8 (a diesel engine, a motor, a turbine or the like) provided inside the hull 1, so that the rotation shaft 5 rotates together with the main drive shaft 6 can do.

A rear propeller 20 is fixed to a rotary shaft 5 extending to the rear of the gear box 40 and a front propeller 10 is rotatably supported on an outer surface between the rear propeller 20 and the gear box 40 . The forward propeller 10 may be rotated in reverse to the rear propeller 20 when the rotary shaft 5 is rotated by being connected to the reverse rotation device 30 as will be described in detail later.

The main drive shaft 6 and the rotating shaft 5 can be connected to each other by a coupling device 7 of a cylindrical shape so as to be separated and coupled by a spline shaft joining method. Here, the spline shaft joint is shown as an example, but the connection method of the main drive shaft 6 and the rotation shaft 5 is not limited thereto. A flange coupling system, a friction clutch system, a magnetic clutch system, or the like can be selectively employed.

2 and 3, the rear propeller 20 is fixed to the rear end portion of the rotation shaft 5 to rotate together with the rotation shaft 5. The rear propeller 20 includes a hub 21 fixed to the rotary shaft 5 and a plurality of blades 22 provided on the outer surface of the hub 21. [ The hub 21 of the rear propeller 20 can be fixed in such a manner that the shaft coupling hole 23 in the central portion is press-fitted into the outer surface of the rotary shaft 5. [ The rear propeller 20 can be more firmly fixed to the rotary shaft 5 by fastening the fixed cap 24 to the rear end of the rotary shaft 5. [

The rear portion 5a of the rotary shaft 5 may be provided with a tapered outer surface whose outer diameter is reduced toward the rear and the axial coupling hole 23 of the hub 21 is formed on the outer surface of the rotary shaft 5 And can be configured with a corresponding tapered inner surface. 2, reference numeral 25 denotes a propeller cap mounted on the hub 21 to cover the rear surface of the rear propeller 20 hub 21 and the fixed cap 24.

The forward propeller 10 is rotatably installed on the outer surface of the rotary shaft 5 between the rear propeller 20 and the reverse rotation device 30. [ The front propeller 10 has a hub 11 rotatably supported on the outer surface of the rotary shaft 5 and a plurality of blades 12 provided on the outer surface of the hub 11. The front propeller 10 may be installed on the outer surface of the rotary shaft 5 before the rear propeller 20 is installed. Further, the wing angle is opposite to the wing angle of the rear propeller (20) because the wing angle is opposite to that of the rear propeller (20).

2 and 5, the hub 11 of the front propeller 10 is supported by a first thrust bearing 13, a second thrust bearing 14 and a first radial bearing 15, 5) outer surface. The first thrust bearing 13 and the second thrust bearing 14 are installed between the inner surface on the front side of the hub 11 and the outer surface of the rotary shaft 5, Side inner surface and the outer surface of the rotary shaft 5.

The first radial bearing 15 is capable of supporting the radial load of the front propeller 10 acting in the radial direction of the rotary shaft 5 and the first and second thrust bearings 13 and 14 are supported on the rotary shaft 5 It is possible to cope with the thrust load acting in the longitudinal direction. Specifically, the second thrust bearing 14 suffers a thrust load acting on the forward side from the forward propeller 10 when the ship is advanced, and the first thrust bearing 13 supports the forward thrust bearing 13 from the forward propeller 10 toward the stern It is possible to cope with the acting thrust load.

The inner ring of the first thrust bearing 13 and the inner ring of the second thrust bearing 14 can be supported so as not to be pushed axially by being disposed so as to be in contact with each other as shown in Fig. The outer ring of the first thrust bearing 13 is coupled to the front surface of the hub 11 and is supported by the fixing ring 39 mounted on the connection flange 62, which will be described later, so that the outer ring is not pushed in the axial direction.

A cylindrical outer support ring 17a and an inner support ring 17b are provided between the hub 11 of the front propeller 10 and the rotary shaft 5 so as to prevent the second thrust bearing 14 from being pushed in the axial direction . The outer support ring 17a is interposed between the outer ring of the second thrust bearing 14 and the outer ring of the first radial bearing 15 so that the inner support ring 17b can be supported by the second thrust bearing (14) and the inner ring of the first radial bearing (15) so that they can be mutually supported.

A gap adjusting ring 18 is provided on the inner surface of the hub 11 between the outer ring of the first radial bearing 15 and the first seal cover 71 to be described later so that the outer ring of the first radial bearing 15 is axially . The outer ring of the first radial bearing 15 is provided on the inner surface of the hub 11 and the outer ring of the first radial bearing 15 is provided on the inner surface of the hub 11. In this case, It is possible to fix the outer ring of the first radial bearing 15 without providing the gap adjusting ring 18, so that the gap adjusting ring 18 can be selectively adopted according to the design.

As shown in FIG. 5, the inner ring of the first radial bearing 15 may be fixed not to be pushed in the axial direction by mounting the cylindrical wedge member 16 between the outer surface of the rotating shaft 5. The wedge member 16 has a tapered outer surface and a thread formed on the rear side outer surface of which the outer diameter decreases toward the rear side, and the inner surface may be press-fitted to the outer surface of the rotary shaft 5. The inner ring of the first radial bearing 15 can be constrained by fastening the tightening nut 16a to the rear side thread of the wedge member 16. Accordingly, the first radial bearing 15 may be firmly fixed between the outer surface of the rotation shaft 5 and the inner surface of the hub 11. The wedge member 16 and the tightening nut 16a can be fastened with a fixing clip 16b for preventing loosening.

As shown in FIG. 2, the front connecting device 50 connecting the rotating shaft 5 and the driving bevel gear 31 in the reverse rotation device 30 is connected to the gearbox 40 in front of the driving bevel gear 31. And a cylindrical front connecting member 51 rotatably supported by the plurality of fixing bolts 31a and connected to the driving bevel gear 31 by the fastening of the plurality of fixing bolts 31a, and the rotation shaft 5 and the front connecting member in front of the gearbox 40. And a spline connecting portion 52 for connecting 51.

As shown in FIG. 4, the spline connecting portion 52 is provided with a spline portion 54a provided on the inner surface of the front connecting member 51 and the spline portion 54a of the front connecting member 51 and provided on the rotary shaft 5. It may include a drive flange 53 provided with a splined portion 54b on the outer surface to be engaged. The spline connecting portion 52 may allow this displacement when an axial displacement of the rotary shaft 5 occurs during the operation of the propulsion device. That is, when the axial movement of the rotary shaft (5) occurs, the movement of the gears (40) in the gearbox (40) is prevented from being transmitted to the front connecting member (51) and the driving bevel gear (31). I can protect it.

On the other hand, the front connection device is not limited thereto, and may be variously changed as in the examples of FIGS. 11 and 12. In the front connection device 250 of FIG. 11, the spline connection part 252 is coupled to the outer surface of the front connection member 251 and the spline connection part 252 provided on the inner surface of the front connection member 251 and the spline connection part 252. 254b is provided on the connecting ring 253 that is engaged to the spline portion 254a of the front connecting member 251, the drive shaft is provided on the rotary shaft 5 and connected to the connecting ring 253 by a plurality of connecting bolts 256 And may include (255).

The spline connector 252 of FIG. 11 may block the power connection by releasing the plurality of connection bolts 256 so that the driving flange 255 and the connection ring 253 are separated if necessary. For example, when a malfunction of the reverse rotation device 30 occurs during the operation of the ship, power transmission from the rotary shaft 5 to the front connection member 251 may be blocked. In this case, the ship can be operated only by the operation of the rear propeller 20.

In the front connection device 350 of FIG. 12, the spline connection part 352 includes a spline portion 354a provided on an inner surface of the front connection member 351, a spline portion 355a provided on an outer surface of the rotary shaft 5, and a rotary shaft 5. It is installed between the outer surface and the inner surface of the front connecting member 351, the splined portion 354b provided on the outer surface is engaged with the splined portion 354a of the front connecting member 351, and the splined portion 355b provided on the inner surface of the rotating shaft ( It may include a connection ring (353) is meshed with the splined portion (355a) of 5). Spline connecting portion 352 of FIG. 12 can also block power transmission to the front connecting member 351 by moving the connecting ring 353 in the axial direction if necessary to separate from the front connecting member 351. In this case, the ship can be operated only by the operation of the rear propeller 20.

2 and 4, the rear connecting device 60 connecting the driven bevel gear 32 and the hub 11 of the front propeller 10 is a gearbox 40 at the rear of the driven bevel gear 32. By the plurality of fixing bolts (32a) rotatably coupled to the rear connecting member 61 and the front bevel gear hub (11) connected to the driven bevel gear (32), and the spline connecting portion (63). It includes a connecting flange 62 is connected to the rear connection member 61 by). Accordingly, the rotation of the driven bevel gear 32 may be transmitted to the front propeller 10 by the rear connection member 61 and the connection flange 62. The connecting flange 62 may be fixed to the hub 11 of the front propeller 10 by fastening a plurality of fixing screws 62a.

As shown in FIG. 4, the spline connecting portion 63 of the rear connecting device 60 has a spline portion 63a formed on an outer surface of the rear connecting member 61 and a spline formed on the connecting flange 62 so as to be correspondingly coupled thereto. It may be composed of teeth 63b. The spline connecting portion 63 may allow this when the shaking or displacement of the front propeller 10 occurs during the operation of the propulsion device. That is, when the movement of the front propeller 10 occurs, the movement of the front propeller 10 may be prevented from being transmitted to the rear connecting member 61 to protect the gears 31, 32, and 33 inside the gearbox 40.

In this embodiment, the spline connecting portions 52, 252, 352, and 63 are provided in the front connecting device 50 and the rear connecting device 60, respectively, to allow the axial displacement, but the spline connecting parts are the front connecting device and the rear connecting device. It may be provided only on either side.

As shown in FIGS. 2, 4, and 6, the gearbox 40 of the reverse rotation device 30 includes a driving bevel gear 31, a driven bevel gear 32, and a plurality of inverted bevel gears 33. A cylindrical outer frame portion 41 defining a circumference of the gear accommodation space 43 to be accommodated, and provided in the outer frame portion 41, and an outer surface thereof defines an inner side of the gear accommodation space 43 and has a rotating shaft ( The cylindrical inner frame part 42 in which the through-hole 42a through which 5) penetrates is provided, and the some connection part 44 which connects the inner frame part 42 and the outer frame part 41 is provided.

4, the plurality of connecting portions 44 are formed on the outer surface of the inner frame portion 42 and the outer frame portion 41 (41) so as not to interfere with the respective inverted bevel gears 33, ) Connect the inner surface. That is, the plurality of connecting portions 44 connect the inner frame portion 42 and the outer frame portion 41 in the region where the inverted bevel gear 33 is not located. The inner frame portion 42, the plurality of connecting portions 44, and the outer frame portion 41 may be integrally formed by casting, or they may be separately formed and then integrally connected by bolting or welding.

2 and 6, the gear box 40 includes a front cover 45 mounted on the front end of the outer frame portion 41 to close the front of the gear accommodating space 43, And a rear cover 46 attached to the rear end of the gear accommodating space 43 to close the rear of the gear accommodating space 43. [

The front connecting member 51 extends in front of the gearbox 40 in a state of being connected to the driving bevel gear 31 in the gearbox 40, and an inner surface thereof is rotatably supported outside the inner frame part 42. The outer surface may be rotatably supported by the front cover 45. To this end, a front inner bearing 47a is installed between the inner surface of the front connecting member 51 and the inner frame part 42, and a front outer bearing 47b between the outer surface of the front connecting member 51 and the front cover 45. This can be installed.

The rear connection member 61 also extends to the rear of the gearbox 40 in a state of being connected to the driven bevel gear 32 inside the gearbox 40, and an inner surface thereof is rotatably supported outside the inner frame part 42. The outer surface may be rotatably supported by the rear cover 46. To this end, a rear inner bearing 48a is installed between the inner surface of the rear connecting member 61 and the inner frame part 42, and a rear outer bearing 48b is disposed between the outer surface of the rear connecting member 61 and the rear cover 46. Can be installed.

The front inner side bearing 47a, the front outer side bearing 47b, the rear inner side bearing 48a and the rear outer side bearing 48b may all be constituted by radial bearings. Such bearings can implement their stable rotation while supporting radial loads acting on the front connecting member 51 and the rear connecting member 61. The driving bevel gear 31 may be rotated in the gear accommodation space 43 by being fixed to the rear end of the front connection member 51 by fastening the plurality of fixing bolts 31a. The driven bevel gear 32 may also be rotated in the gear accommodation space 43 by being fixed to the front end of the rear connection member 61 by fastening the plurality of fixing bolts 32a.

The plurality of inverted bevel gears 33 are interposed between the driving bevel gears 31 and the driven bevel gears 32 in a seized state. That is, as shown in FIG. 4, the teeth on both sides of the drive bevel gear 31 and the driven bevel gear 32 are engaged with each other in a state where they are installed in the space formed between the connection portions 44 of the gear box 40. A shaft 34 supporting each of the inverted bevel gears 33 is disposed in a direction intersecting the rotation axis 5 (radial direction of the rotation axis), and a plurality of the rotation axis 5 can be radially arranged around the rotation axis 5. The shaft 34 of each inverted bevel gear may have one end fixed to the inner surface of the inner frame part 41 by fastening a plurality of fixing bolts, and the inverted bevel gear between the shaft 34 and the inverted bevel gear 33. Bearing 34a may be installed to smoothly rotate 33.

The reverse rotation device 30 is provided with a plurality of inverted bevel gears 33 in the gearbox 40, the drive bevel gear 31, the front connecting member 51, the front cover in front of the gearbox 40 45 and the like, and the driven bevel gear 32, the rear connecting member 61, the rear cover 46 and the like can be assembled from the rear side of the gearbox 40.

The assembled inverting rotary device 30 can be installed in such a manner that it is combined with the rotary shaft 5 and then enters the installation space 4 of the hull rear 3. In addition, the driving bevel gear 31, driven bevel gear 32, and inverted bevel gear 33 are formed in the gear accommodation space 43 between the outer frame portion 41 and the inner frame portion 42 of the gearbox 40. Since it is fully accommodated, it is possible to reliably protect the gears 31, 32, 33. In particular, the front connecting member 51 is driven bevel gear 31 because the inner surface is supported by the inner frame portion 42 by the front inner bearing 47a and the outer surface is supported by the front cover 45 by the front outer bearing 47b. ) Can be rotated while supporting it stably. Similarly, the rear connecting member 61 is driven bevel gear 32 because its inner surface is supported by the inner frame part 42 by the rear inner bearing 48a and the outer surface is supported by the rear cover 46 by the rear outer bearing 48b. ) Can be rotated while supporting it stably.

In the present embodiment, the inversion rotating device 30 shows a case in which the inversion bevel gears 33 are plural, but the inversion bevel gear 33 inverts the rotation of the driving bevel gear 31 to the driven bevel gear 32. It does not have to be plural because it may be delivered. A small ship with a small driving load would be able to implement its function with only one inverted bevel gear.

A cylindrical inner support ring 38a and an outer support ring 38b may be installed between the rear connection member 61 and the outer surface of the rotary shaft 5. The inner support ring 38a is interposed between the inner frame portion 42 and the inner ring of the first thrust bearing 13 so that the gap therebetween can be maintained. The outer support ring 38b may be installed on the inner surface side of the rear connection member 61 to support the outer ring of the rear inner bearing 48a. A fixing ring 39 may be mounted on the connection flange 62 to prevent the outer support ring 38b from being separated. The retaining ring 39 can support the outer ring of the first thrust bearing 13, as shown in Figs.

A cylindrical sleeve bearing 49 for rotatably supporting the rotating shaft 5 may be installed between the through hole 42a of the inner frame portion 42 of the gear box 40 and the outer surface of the rotating shaft 5. [ Therefore, since the rotary shaft 5 is supported by the inner frame portion 42 of the gear box 40 via the sleeve bearing 49, the rotary shaft 5 can be stably rotated in the radial direction while being prevented from shaking.

In the reverse rotation device 30, the front connecting member 51 rotates when the rotating shaft 5 rotates, and the driving bevel gear 31 connected to the front connecting member 51 rotates. The rotation of the driven bevel gear 31 is inverted by the plurality of inverted bevel gears 33 and then transmitted to the driven bevel gear 32 so that the driven bevel gear 32 rotates in the direction opposite to the driven bevel gear 31. [ The rotation of the driven bevel gear 32 is transmitted to the front propeller 10 by the rear connection member 61. Therefore, it is possible to realize the opposite rotation of the front propeller 10 and the rear propeller 20.

As described above, since the inversion rotating device 30 of the present embodiment implements the mutual inversion of the two propellers 10, 20 through the plurality of bevel gears 31, 32, 33, the volume of the two propellers 10, Can be reduced. Therefore, the volume of the gear box 40 installed in the rear hull 3 can be minimized.

The conventional planetary gear type inverting rotary device has a relatively large volume because it includes a sun gear installed on the rotary shaft, a planetary gear provided outside the sun gear, and a cylindrical internal gear installed outside the planetary gear. In addition, since the planetary gear type reverse rotation device has to rotate the internal gear disposed at the outermost part, the volume of the casing outside is inevitably increased. Therefore, it is practically very difficult to install it in the rear of the hull as in the case of the present embodiment. Even if it is installed in the hull tail, there is a problem to increase the size of the hull tail.

In addition, the propulsion device of the present embodiment, as shown in Figure 2, the first seal for sealing between the hull aft 3 and the hub 11 of the front propeller 10 to prevent the ingress of seawater (or fresh water) or foreign matter Apparatus 90 and second sealing device 110 for sealing between hub 11 of front propeller 10 and hub 21 of rear propeller 20 for the same purpose.

As shown in FIG. 8, the first sealing device 90 includes a cylindrical first lining 91 and a first lining 91 provided at a connection flange 62 fixed to the front surface of the front propeller hub 11. The first cover member 92 may include a cylindrical first sealing member 92 covering an outer surface of the first lining 91 to be in contact with the outer surface and having one end fixed to the rear cover 46.

The first sealing member 92 includes a plurality of packings 93a, 93b and 93c spaced apart from each other on the inner surface facing the first lining 91 and in contact with the outer surface of the first lining 91, , 93b, 93c) for supplying a fluid for sealing. The oil passage 95 of the first sealing member 92 is connected to the lubricating oil supply passage 96 passing through the front and rear covers 45 and 46 of the gear box 40 so that lubricating oil having a predetermined pressure can be supplied (See FIG. 2). The lubricating oil having a pressure is supplied to the grooves between the respective packings 93a, 93b and 93c so that the respective packings 93a, 93b and 93c are pressed against the first lining 91 to come in close contact with each other, have.

As shown in Fig. 9, the first lining 91 may be composed of a first member 91a and a second member 91b, both sides of which are divided into semicircles. The packing 91d can be interposed in the mutually divided portions 91c of the first and second members 91a and 91b so that sealing can be performed when they are mutually coupled. A first binding portion 91e protruding from one side of the first member 91a is provided on the divided partial free end side of the first member 91a and a second binding portion 91b protruding from the other side of the second binding portion 91b, And a fixing bolt 91g is fastened thereto, so that both sides can be firmly coupled to each other. A plurality of fixing bolts 91i are fastened to the flange portion 91h fixed to the connecting flange 62, thereby being firmly fixed to the hub 11. The first lining 91 is not limited to the first lining 91 but may be divided into a first member 91a and a second member 91b. And the member 91b may be integrally connected to each other.

The first sealing member 92 may also be formed by stacking a plurality of semicircular rings 92a, 92b and 92c in the longitudinal direction of the rotary shaft 5 outside the first lining 91. The plurality of rings 92a, 92b, 92c may be joined together by bolting or welding.

10, the second sealing device 110 includes a cylindrical second lining 111 provided on the front surface of the rear propeller hub 21 and a second lining 111 contacting the outer surface of the second lining 111. [ 111) outer surface and one end of which is fixed to the rear surface of the front propeller hub (11). The second sealing member 112 also includes a plurality of packings 113a, 113b, and 113c provided on the inner surface of the second sealing member 112 as well as the first sealing member 92 and a flow path 115 for supplying the fluid to the grooves between the packing.

The flow path 115 of the second sealing member 112 may communicate with the lubricating oil supply flow path 120 provided at the center of the rotation shaft 5. A first connection channel 121 in the radial direction for connecting the lubricating oil supply passage 120 and the inner space 122 of the second lining 111 is formed in the rotary shaft 5 and the front propeller hub 11 A second connection channel 123 may be formed to communicate the inner space 122 of the second lining 111 and the channel 115 of the second sealing member 112. [ Therefore, the lubricant supplied from the center of the rotary shaft 5 to the second sealing member 112 can press the packings 113a, 113b, and 113c, thereby achieving sealing.

The second lining 111 and the second sealing member 112 are each formed in a semicircular shape like the first lining 91 and the first sealing member 92 of the first sealing device 90, It may be a method of combining after installation.

2 and 5, the front propeller 10 is provided with a ring-shaped member 11 mounted on the rear side of the hub 11 to seal a gap between the outer surface of the rotary shaft 5 and the inner surface of the hub 11, 1 sealing cover 71 as shown in Fig. The first sealing cover 71 has a sealing member 71a for enhancing the adhesion to the inner circumferential surface of the rotary shaft 5 in contact with the outer surface thereof. The first sealing cover 71 can prevent the seawater from flowing into the gear box 40 even if the seawater intrudes into the second space 111 of the second lining 111 due to a failure of the second sealing device 110 have. That is, the first sealing cover 71 can prevent the seawater intrusion toward the gear box 40 more reliably by implementing the secondary barrier.

Referring to FIG. 2, the front sealing member 51 has a second sealing cover 72 similar to the first sealing cover 71 described above for sealing between the front connecting member 51 and the outer surface of the rotary shaft 5. Can be installed. The second seal cover 72 can prevent the lubricating oil filled in the gear box 40 from leaking toward the hull 1.

The reverse rotation device 30 is a front sealing cover 73 for sealingly covering the front of the front outer bearing 47b between the front cover 45 and the front connecting member 51, and the rear cover 46 and the rear connecting member. It may include a rear sealing cover 74 for sealingly covering the rear of the rear outer bearing 48b between the 61. The front and rear sealing covers 73 and 74 may also be provided in a similar form to the first sealing cover 71 described above.

The front seal cover 73 and the rear seal cover 74 can prevent the lubricating oil inside the gear box 40 from leaking out of the gear box 40. [ In the same way as the first sealing cover 71, the rear sealing cover 74 prevents the seawater from flowing into the gear box 40 even if the seawater intrudes into the space inside the first lining 91 due to the failure of the first sealing device 90 It is also possible to function as a secondary barrier.

 In addition, the propulsion apparatus of the present embodiment may include a second radial bearing 81, a third thrust bearing 82, and a fourth thrust bearing 83 for supporting the rotation shaft 5 in front of the gearbox 40. . The second radial bearing 81 may be fixed to the first bearing support portion 86 inside the hull 1 in a state in which the second radial bearing 81 is accommodated in the first bearing case 84. The third and fourth thrust bearings 82 and 83 can also be fixed to the second bearing support 87 inside the hull 1 in a state where the respective inner rings are supported by the second bearing case 85 in a mutually- have.

The second radial bearing 81 supports the rotary shaft 5 in front of the gear box 40 to prevent radial vibration or shaking of the rotary shaft 5. The third and fourth thrust bearings 82 and 83 function to transmit the axial force transmitted from the front and rear propellers 10 and 20 to the rotary shaft 5 toward the hull 1. Particularly, the third thrust bearing 82 functions to transmit a force acting in the forward direction from the rotary shaft 5 to the hull 1 when the ship is advanced. The fourth thrust bearing 83 functions to rotate the rotary shaft 5 to the stern body 1 in the stern direction.

2, reference numeral 131 denotes a first covering ring covering between the rear hull 3 and the front propeller hub 11 outside the first sealing device 90 and 132 denotes a front propeller hub outside the second sealing device 110. [ (11) and the rear propeller hub (21). The first cover ring 131 is fixed to the rear hull 3 and is installed in such a manner as to be slightly spaced from the hub 11 of the front propeller or is disposed slightly spaced from the rear hull 3, 11 and rotate together with the forward propeller 10. The second cover ring 132 can be rotated together with the fixed side fixed to either the hub 11 of the forward propeller or the hub 21 of the rear propeller.

Next, a method of manufacturing the propulsion device according to the present embodiment and installing the propulsion device on the hull will be described.

As shown in Fig. 6, when the propulsion device is installed, the gear box 40 and the related parts constituting the reverse rotation device 30 and the rotary shaft 5 are assembled before being mounted on the hull 1. That is, after assembling the inverted bevel gear 33 in the gear accommodation space 43 of the gearbox 40, the driving bevel gear 31, the front connecting member 51, the front cover 45 in front of the gearbox 40. ) And assembling the driven bevel gear 32, the rear connecting member 61, the rear cover 46, and the like from the rear side of the gearbox 40. The first lining 91 and the first sealing member 92 of the first sealing device 90 are also installed between the connecting flange 62 and the rear cover 46 of the rear connecting device 60. Such a reverse rotation device 30 can be assembled after machining each part in a separate manufacturing factory, and thus it is possible to manufacture precisely.

The rotating shaft 5 and the inversion rotating device 30 assembled at the manufacturing factory can be moved to a dock or the like for manufacturing the hull 1 by using the transportation means and then mounted on the rear end 3 of the hull 1. In this case, a lifting device such as a crane capable of lifting the assembly of the reversing rotating device 30 can be used. When the reverse rotation device 30 is mounted, the gearbox 40 of the reverse rotation device 30 is first slid into the installation space 4 of the hull aft 3 from the rear of the hull 1. The center of the rotation shaft 5 and the center of the main drive shaft 6 are aligned.

After the reverse rotation device 30 enters and aligns with the installation space 4 of the hull aft 3, as shown in FIG. 7, the front fixing member 76 is respectively located at the front and the rear of the gearbox 40. And a rear fixing member 77 to fix the gearbox 40 to the hull aft 3. The front and rear fixing members 76 and 77 may be divided into a plurality of forms. The front and rear fixing members 76 and 77 may be fixed to the structure of the gearbox 40 and the hull aft 3 by fastening a plurality of fixing bolts.

The rear fixing member 77 may be mounted by an operator approaching from the rear of the hull 1, and the front fixing member 76 may be mounted by an operator approaching from the inside of the hull 1. The inversion rotating device 30 mounted in such a manner as to enter the installation space 4 of the hull rear 3 can separate the inversion rotating device 30 from the hull 1 when a failure or the like occurs in the future, The fault can be repaired in the state. Therefore, fault repair can be easily performed.

The present embodiment illustrates the case in which the front fixing member 76 and the rear fixing member 77 are fastened to the front and rear of the gear box 40 in order to firmly fix the gear box 40. When entering into the installation space (4), the outer surface of the gear box 40 is maintained in a state supported on the inner surface of the installation space (4), the gear box 40 is also the rear hull member by fastening only the rear fixing member 77 It can be fixed to (3).

The second radial bearing 81 and the third and fourth thrust bearings 82 and 83 are installed in the inside of the hull 1 so as to rotate the rotary shaft 5 after the gear box 40 is fixed to the rear hull 3, So that the main drive shaft 6 and the rotary shaft 5 are connected to each other by the coupling device 7. [

1 and 2, the front propeller 10, the rear propeller 20 and related components are mounted on the rotary shaft 5 after the reverse rotation device 30 is mounted on the rear end 3 of the hull, And the installation of the propulsion device can be completed by mounting the second sealing device 110. [

The following describes the operation of the propulsion device according to the present embodiment.

The propeller is rotated by the rear propeller 20 directly connected to the rear end of the rotary shaft 5 in the same direction as the rotary shaft 5 when the rotary shaft 5 is rotated by the operation of the internal drive source 8 of the hull 1 . At the same time, since the driving bevel gear 31 of the reversing rotating device 30 is also connected to the rotating shaft 5, the rotating bevel gear 31 rotates together with the rotating shaft 5. The rotation of the driven bevel gear 31 is reversed by the plurality of inverted bevel gears 33 and is transmitted to the driven bevel gear 32 so that the driven bevel gear 32 rotates in the direction opposite to the rotating shaft 5. [ Therefore, the front propeller 10 connected by the driven bevel gear 32 and the rear connecting member 61 rotates opposite to the rear propeller 20.

The forward propeller 10 and the rear propeller 20, which rotate in opposite directions, generate propelling water in the same direction because their blade angles are opposite to each other. In other words, when the ship moves forward, the propulsion water is generated backward, and when the ship is backward, the propulsion water is generated forward while rotating in the reverse direction. In addition, the propulsion performance of the propulsion water generated when advancing is improved because propulsion power of the fluid through the front propeller 10 is recovered by the propeller 20 while the propeller 20 is rotating in the reverse direction. The same goes for backward.

On the other hand, since the forward propeller 10 generates propelling water backward when it is advanced, it receives a reaction force corresponding thereto. This force is transmitted to the rotary shaft 5 through the second thrust bearing 14 and acts as propulsive force. The rear propeller 20 is also subjected to a reaction force because it generates propellant water rearwardly when it is advanced. This force is also transmitted to the direct-coupled rotary shaft 5 and acts as propulsive force.

The thrust of the forward propeller 10 is transmitted to the rotary shaft 5 through the first thrust bearing 13 and the propulsive force of the rear propeller 20 is also transmitted to the rotary shaft 5 directly connected thereto.

As a result, the propulsion system of the present embodiment transmits the propulsive force generated by the operation of the front propeller 10 and the rear propeller 20 to the rotary shaft 5 when the ship moves forward and backward. The propulsion force transmitted to the rotary shaft 5 is transmitted to the hull 1 through the third and fourth thrust bearings 82 and 83, so that the hull 1 is propelled.

1: hull, 3: hull,
4: installation space, 5: rotating shaft,
6: main drive shaft, 7: coupling device,
8: drive source, 10: forward propeller,
13: first thrust bearing, 14: second thrust bearing,
15: first radial bearing, 16: wedge member,
20: rear propeller, 30: reverse rotation device,
31: driven bevel gear, 32: driven bevel gear,
33: reverse bevel gear, 37: connecting flange,
40: gear box, 41: outer frame part,
42: inner frame portion, 43: gear accommodating space,
44: connection portion, 45: front cover,
46: rear cover, 49: sleeve bearing,
50: front connecting device, 51: front connecting member,
52: spline connection, 60: rear connection,
61: rear connection member, 63: spline connection,
71: first sealing cover, 72: second sealing cover,
73: front sealing cover, 74: rear sealing cover,
81: second radial bearing, 82: third thrust bearing,
83: fourth thrust bearing, 90: first sealing device,
110: Second sealing device.

Claims (11)

A rear propeller fixed to the rotary shaft;
A front propeller rotatably supported on the rotary shaft in front of the rear propeller;
And a reverse rotation device for reversing the rotation of the rotation shaft and transmitting the rotation to the front propeller,
The reverse rotation device is a drive bevel gear connected to the rotating shaft by a front connection device; A driven bevel gear connected to the hub of the front propeller by a rear connection device; At least one inverted bevel gear that reverses rotation of the driving bevel gear and transfers the driven bevel gear; A gearbox mounted at the rear of the hull and having a gear accommodation space therein for receiving the driving bevel gear, the driven bevel gear, and the inverted bevel gear;
The gear box includes an outer frame portion defining a circumference of the gear accommodation space, an inner frame portion provided in the outer frame portion, the outer surface of which defines a inner side of the gear accommodation space, and a through hole through which the rotating shaft penetrates in the center thereof, It includes a connecting portion connecting the inner frame portion and the outer frame portion,
Wherein at least one of the front connecting device and the rear connecting device includes a spline connecting portion for permitting axial displacement. The method of claim 1,
The gear box further includes a front cover mounted to the front end of the outer frame part to close the front of the gear accommodation space, and a rear cover mounted to the rear end of the outer frame part to close the rear of the gear accommodation space. 3. The method of claim 2,
The front connecting device includes a front connecting member rotatably supported outside the inner frame part, coupled to the driving bevel gear, and connected to the rotating shaft by the spline connecting part. The method of claim 3,
The spline connecting portion includes a splined portion provided on the inner surface of the front connecting member and a driving flange provided on the rotary shaft and the splined portion provided on the outer surface to be engaged with the splined portion of the front connecting member. The method of claim 3,
The spline connecting portion is provided on the splined portion provided on the outer surface of the front connection member, a coupling ring coupled to the outer surface of the front connection member and the splined portion provided on the inner surface of the splined portion of the front connection member, and the rotating shaft Ship propulsion device comprising a drive flange connected to the connection ring by a plurality of connecting bolts. The method of claim 3,
The spline connecting portion is provided between the splined portion provided on the inner surface of the front connecting member, the splined portion provided on the outer surface of the rotary shaft, and the splined portion provided on the inner surface of the rotary shaft outer surface and the front connecting member, and the splined portion of the rotary shaft A propulsion device for a ship comprising a connection ring which is engaged with and is provided with a splined portion provided on an outer surface of the front connecting member. The method of claim 3,
The reverse rotation apparatus includes a front outer bearing installed between the front connection member outer surface and the front cover, and a front inner bearing installed between the front connection member inner surface and the inner frame portion. 3. The method of claim 2,
The rear connection device is rotatably supported outside the inner frame part and is connected to the driven rear bevel gear cylindrical rear connection member, and a coupling flange connected to the front propeller hub front surface and connected to the rear connection member by the spline connection part. Ship propulsion device comprising a. 9. The method of claim 8,
The spline connecting portion includes a spline portion provided on the outer surface of the rear connection member, and a spline portion provided on the connection flange to be engaged with the spline portion of the rear connection member. 9. The method of claim 8,
The reverse rotation apparatus includes a rear outer bearing installed between the rear connecting member outer surface and the rear cover, and a rear inner bearing installed between the inner surface of the rear connecting member and the inner frame portion. Ship having a propulsion device according to any one of claims 1 to 10.

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