KR20130125681A - Propulsion apparatus for ship, and ship having the same - Google Patents

Abstract

A propulsion device for a ship and a ship having the same are disclosed. The propulsion device for a ship according to an embodiment of the present invention comprises: a rear propeller fixed to a rotary shaft; a front propeller which is supported to the rotary shaft in front of the rear propeller to be rotated; and a counter rotating device which reverses the rotation of the rotary shaft and transfers the reversed rotation to the front propeller. The counter rotating device comprises: a gear box received in an installation space formed in the rear end of a hull; a drive bevel gear which is installed in the rotary shaft inside of the gear box; a driven bevel gear which is supported to the rotary shaft inside of the gear box to be rotated; one or more reverse bevel gears which reverse the rotation of the drive bevel gear and transfer the reversed rotation to the driven bevel gear; and a front connecting member which connects the rotary shaft and the drive bevel gear to each other and is coupled to the rotary shaft through a spline connecting part for allowing axial displacement.

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.

According to an aspect of the present invention, there is provided a propulsion system including a rear propeller fixed to a rotary shaft, a front propeller rotatably supported on the rotary shaft in front of the rear propeller, and an inversion rotary device for inverting the rotation of the rotary shaft to transmit the rotation to the front propeller , The reverse rotation device includes a gear box accommodated in a rear space of the hull, a driven bevel gear provided on the rotary shaft inside the gear box, a driven bevel gear rotatably supported on the rotary shaft inside the gear box, At least one inverting bevel gear for inverting the rotation of the gear and transmitting the rotation to the driven bevel gear, and a front connecting member coupled to the rotating shaft by a spline connecting part connecting the rotating shaft and the driven bevel gear, A marine propulsion device may be provided.

The spline connection portion may include a first spline tooth portion provided on the inner surface of the front connecting member and a second spline tooth portion provided on the rotation shaft and coupled to the first spline tooth portion.

The spline connection portion may include a connection ring including a first spline tooth portion provided on an inner surface of the front connecting member and a second spline tooth portion fixed to the rotation shaft and coupled to the first spline tooth portion.

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 mounted in such a manner that the gearbox of the reverse rotation device enters the installation space formed at the rear of the hull in a state in which the reverse rotation device is manufactured and assembled outside of the hull, and the front connection member and Since the rotating shaft is connected by the spline connection, it is easy to manufacture and install.

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, since the front connecting member and the rotating shaft are connected by the spline connecting portion, the propelling device according to the present embodiment can prevent the displacement from being transmitted to the inside of the gear box through the front connecting member even when axial displacement of the rotating shaft occurs . Therefore, the gears inside the gear box can be protected from impact due to the rotation shaft displacement.

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.
FIG. 11 shows a modification of the spline coupling portion for connecting the front coupling device and the rotation shaft of the propulsion device according to the embodiment of the present invention.

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, ). This hull aft 3 can be fixed to the hull 1 by welding and then made by casting. 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.

2 to 4, the reverse rotation device 30 includes a drive bevel gear 31 and a drive bevel gear 31 provided in the gear box 40 so as to rotate together with the rotation shaft, A driven bevel gear 32 rotatably supported on a rotary shaft 5 inside the rotary bevel gear 40, a plurality of inverted bevel gears 33 for inverting and transmitting the rotation of the driven bevel gear 31 to the driven bevel gear 32, Respectively. A cylindrical front connecting member 35 for connecting the rotating shaft 5 and the driven bevel gear 31; a cylindrical rear connecting member 36 for connecting the driven bevel gear 32 and the hub 11 of the front propeller 10; . ≪ / RTI >

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 can be supported so as not to be pushed in the axial direction by being supported by the fixing ring 39 on the side of the rear connecting member 36 engaged with the hub 11. 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 rotates about the axis Direction. 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.

2, 4 and 6, the gear box 40 of the reverse rotation device 30 includes a drive bevel gear 31, a driven bevel gear 32, and a plurality of inverted bevel gears 33 A front cover 42 coupled to the body 41 to close the front side opening of the body 41 and a front cover 42 coupled to the body 41, And a rear cover 43 coupled to the body portion 41 to close the rear side opening of the rear cover.

The front cover 42 can rotatably support a front link member 35 passing through the center portion thereof and the rear cover 43 rotatably supports a rear link member 36 passing through the center portion thereof . A front bearing 44 is provided between the outer surface of the front link member 35 and the front cover 42 and a rear outer bearing 45 is provided between the outer surface of the rear link member 36 and the rear cover 43 .

A plurality of rear outer bearings 45 are provided continuously in the longitudinal direction of the rotary shaft 5 so that the rear outer bearings 45 can be rotated in a state in which the rear connecting members 36 are stably supported. A rear inner bearing 46 is provided between the inner surface of the rear connecting member 36 and the rotating shaft 5 for rotatable support of the rear connecting member 36 and is provided between the front connecting member 35 and the outer surface of the rotating shaft 5 A cylindrical sleeve bearing 47 may be provided. A cylindrical separating ring 49 may be provided on the outer surface of the rotating shaft 5 between the inner ring of the rear inner bearing 46 and the sleeve bearing 47 to support the inner ring therebetween.

The front bearing 44, the rear outer bearing 45, the rear inner bearing 46 may all be composed of a radial bearing. These bearings 44, 45 and 46 can realize a stable rotation of the rotary shaft 5, the front connecting member 35 and the rear connecting member 36 while supporting the radial load acting on them.

The driving bevel gear 31 is connected to the front connecting member 35 by fastening a plurality of fixing bolts 31a to rotate together with the front connecting member 35. [ The driven bevel gear 32 is also connected to the rear connecting member 36 by fastening a plurality of fixing bolts 32a. The driven bevel gear 32 may be spaced apart from the rotary shaft 5 so that the inner diameter portion of the driven bevel gear 32 is not interfered with the rotary shaft 5 during rotation.

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. 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. Bearings 34a and 34b may be provided at both ends of the shaft 34 of each of the inverted bevel gears 33 for smooth rotation of the shaft 34. [

The inner frame 50 may be installed inside the gear box 40 and the plurality of fixing members 40 may be installed in the gear box 40. In this case, 51 in the body portion 41 by fastening.

4, a through hole 52 through which the rotary shaft 5 passes is formed in the center of the inner frame 50, and the width (W, width in the longitudinal direction of the rotary shaft) of the inner frame 50 is connected to the inverted bevel gear 33 Or a polygonal prism having a diameter smaller than the maximum outer diameter of the polygonal prism. The inner frame 50 rotatably accommodates each of the inverted bevel gears 33 so that the inverted bevel gears 33 can be meshed with the driven and driven bevel gears 31, And a mounting portion 53. [ The first shaft support portion 54 and the second shaft support portion 55 are provided to support the bearings 34a and 34b provided at both ends of the shaft 34 of the inverted bevel gear 33, respectively. The plurality of inverting bevel gears 33 may be arranged radially with a plurality of through holes 52 as a center.

As shown in FIG. 4, the first and second axially supports 54 and 55 are formed to be opened in the direction of one side of the inner frame 50 for mounting the inverted bevel gear shaft 34 . A first fastening member 54a and a second fastening member 55a, which cover and fix the bearings 34a and 34b, may be mounted thereon. When the inverted bevel gear 33, the shaft 34 of the inverted bevel gear, and the bearings 34a and 34b are assembled when the inverted bevel gear 33 is installed in the inner frame 50, The first and second fastening members 54a and 55a can be fastened and fixed after being installed in such a manner as to enter the gear attachment portion 53 from one side direction of the fastening member 50. [ Here, an example of a method of mounting the inverted bevel gears 33 to the inner frame 50 is presented, but the mounting manner of the inverted bevel gear 33 is not limited thereto. When the shape of the inner frame 50 is changed, the manner in which the inverted bevel gear 33 is mounted on the inner frame 50 may be changed.

The inner frame 50 on which the inverted bevel gears 33 are mounted is rotated by the drive bevel gear 31, the driven bevel gear 32, the front cover 42, the rear cover The plurality of fixing members 51 may be fastened and fixed in the body portion 41 after entering the body portion 41 of the gear box 40 before installing the fixing members 51,

The plurality of fixing members 51 may be provided in the form of a cylindrical pin as shown in Figs. 4 and 6. Fig. The fixing member 51 is installed to penetrate the body portion 41 from the outside of the body portion 41 into the body portion 41 so that the inner end thereof can support the inner frame 50 in a fixed state. . The inner end of the fixing member 51 can enter the fixing groove 56 around the inner frame 50 so that the inner frame 50 can be bound. The outer end of the fixing member 51 may be fixed to the body portion 41 by fastening the fixing screw.

In this gear box 40, after the inverted bevel gear assembly including the inner frame 50 is mounted in the body portion 41, the driven bevel gear 31 and the driven bevel gear 31 are inserted through the openings on both sides of the body portion 41, The rear cover 43, the front connecting member 35, the rear connecting member 36, and the like can be installed. Therefore, the reverse rotation device 30 can be easily assembled, and the repair of the fault can be easily performed later.

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.

2 and 6, the front linking member 35 may be connected to the rotary shaft 5 so as to rotate together by a spline connection portion 60 provided between the outer surface of the rotary shaft 5 and the inner surface thereof. 4, the spline connecting portion 60 includes a first spline tooth portion 61 provided on the inner surface of the front connecting member 35 and a second spline tooth portion 61 formed on the inner circumferential surface of the rotating shaft 5 to be engaged with the first spline tooth portion 61. [ And a second spline tooth portion 62 provided on the outer surface.

The second splined portion 62 is formed directly on the outer surface of the rotary shaft 5 as shown in FIGS. 6 and 7, or as shown in FIG. 11, and a coupling ring 63 coupled to the outer surface of the rotary shaft 5. It may be formed on the outer surface of the). The connection ring 63 may be separately formed so that the second spline teeth 62 are formed on the outer surface of the connection ring 63, and then may be fixed to the outer surface of the rotary shaft 5 in such a manner that the connection ring 63 is press- .

The spline connecting portion 60 allows the rotating shaft 5 and the front connecting member 35 to be connected to each other only by fitting the front connecting member 35 on the outer surface of the rotating shaft 5, ) Can be easily assembled. The spline connection portion 60 can protect the gears 31, 32, 33 inside the gear box 40 by allowing this displacement when axial displacement of the rotary shaft 5 occurs in the course of operation of the propulsion device . The gears 31, 32 and 33 in the gear box 40 can be protected by preventing the movement of the rotary shaft 5 from being transmitted to the front link member 35 when the axial movement of the rotary shaft 5 occurs.

The rear connecting member 36 has a connecting flange 37 connected to the hub 11 of the front propeller 10 at its rear end. The connecting flange 37 may be integrally formed with the rear connecting member 36 and fixed to the front surface of the hub 11 of the front propeller 10 by fastening a plurality of fixing bolts 37a. Therefore, the rotation of the driven bevel gear 32 can be transmitted to the front propeller 10 by the rear connecting member 36.

A cylindrical inner supporting ring 38a and an outer supporting ring 38b may be provided between the rear connecting member 36 and the outer surface of the rotating shaft 5 to support a rear inner bearing 46. [ The inner support ring 38a is interposed between the inner ring of the rear inner bearing 46 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 connecting member 36 to support the outer ring of the rear inner bearing 46. [ A fixing ring 39 may be mounted on the rear end of the rear connecting member 36 to prevent the outer supporting ring 38b from being separated. The retaining ring 39 can support the outer ring of the first thrust bearing 13, as shown in Figs.

When the rotary shaft 5 rotates, the front connecting member 35 rotates and the driving bevel gear 31 connected to the front connecting member 35 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 connecting member 36. 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.

8, the first sealing device 90 includes a cylindrical first lining 91 provided on a connecting flange 37 fixed to the front surface of the front propeller hub 11, And a cylindrical first sealing member 92 which covers the outer surface of the first lining 91 so as to contact the outer surface and one end of which is fixed to the rear cover 43.

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 42 and 43 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. The flange portion 91h fixed to the connection flange 37 can be firmly fixed to the hub 11 by fastening a plurality of fixing bolts 91i. 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.

2, a front end of the front connecting member 35 in front of the gear box 40 is formed with a shape similar to that of the first sealing cover 71 described above for sealing between the front connecting member 35 and the outer surface of the rotating shaft 5 The second sealing cover 72 of the second embodiment can be provided. The second seal cover 72 can prevent the lubricating oil filled in the gear box 40 from leaking toward the hull 1.

The inversion rotating device 30 includes a front sealing cover 73 sealingly covering the front bearing 44 between the front cover 42 and the front connecting member 35 and a front sealing cover 73 sealing the front cover 42 between the rear cover 43 and the rear connecting member And a rear seal cover 74 that hermetically covers the rear surface of the rear outside bearing 45 between the front and rear bearings. 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 can be fixed to the first bearing support portion 86 inside the hull 1 while being 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. A drive bevel gear 31, a driven bevel gear 32, a front connecting member 35, a front bevel gear 33, a front bevel gear 33, The cover 42, the front bearing 44, the rear connecting member 36, the rear cover 43, the rear outer bearing 45, and the like are assembled. The first lining 91 and the first sealing member 92 of the first sealing device 90 are also provided between the connecting flange 37 of the rear connecting member 36 and the rear cover 43.

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. In addition, since the first sealing device 90 to be installed after installation of the front propeller 10 can be previously mounted on the inversion rotating device 30 in the normal case, the operation of installing the propelling device on the subsequent ship 1 is simplified can do.

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. The gear box 40 of the reverse rotation device 30 is first slidably moved from the rear of the hull 1 to the installation space 4 of the rear hull 3 of the hull 3 when the reverse rotation device 30 is mounted. 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 is aligned with the installation space 4 of the hull aft 3, as shown in FIG. And a rear fixing member 48b to fix the gearbox 40 to the hull aft 3. The front and rear fixing members 48a, 48b may be in the form of a plurality of divided parts. The front and rear fixing members 48a and 48b can be fixed to the structure of the gear box 40 and the hull rear 3 by fastening a plurality of fixing bolts.

The rear fixing member 48b can be mounted by approaching from the rear of the hull 1 and the front fixing member 48a can be mounted by the operator in the vicinity of 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 exemplifies the case where the front fixing member 48a and the rear fixing member 48b are fastened to the front and back of the gear box 40 for firm fixing of the gear box 40, The outer surface of the gear box 40 is retained on the inner surface of the installation space 4 when the gear box 40 is moved into the installation space 4. Therefore, the gear box 40 can be fastened only to the rear fixing member 48b, (3).

After the gearbox 40 is fixed to the hull aft 3, the main drive shaft 6 and the rotation shaft 5 are connected with the coupling device 7, and the second radial bearing 81 is installed inside the hull 1. ), The third and fourth thrust bearings (82, 83) are installed so that the rotating shaft (5) can be supported by the hull (1).

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 fixed to the rotating shaft 5, the driving 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 36 rotates in the direction 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: inverted bevel gear, 35: front connecting member,
36: rear connecting member, 37: connecting flange,
40: gear box, 41: body part,
42: front cover, 43: rear cover,
44: front bearing, 45: rear outer bearing,
46: rear inner bearing, 50: inner frame,
60: spline connection portion, 90: first sealing device,
110: Second sealing device.

Claims (4)

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 gearbox accommodated in the installation space of the hull rear, a driving bevel gear installed on the rotating shaft inside the gearbox, a driven bevel gear rotatably supported on the rotating shaft inside the gearbox, the driving bevel gear One or more inverted bevel gears for inverting the rotation of the bevel gears to be transmitted to the driven bevel gear, and a front connecting member coupled to the rotating shaft by a spline connecting portion connecting the rotating shaft and the driving bevel gear to allow axial displacement. Propulsion system. The method of claim 1,
Wherein the spline connection portion includes a first spline tooth portion provided on the inner surface of the front connecting member and a second spline tooth portion provided on the rotation shaft and coupled to the first spline tooth portion. The method of claim 1,
Wherein the spline connection portion includes a first spline tooth portion provided on the inner surface of the front connecting member and a second spline tooth portion fixed to the rotation shaft and coupled to the first spline tooth portion. A ship equipped with the propulsion device according to any one of claims 1 to 3.

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