KR101444333B1 - Propulsion apparatus for ship, and ship having the same - Google Patents

Abstract

A ship propulsion device and a ship equipped with the propulsion device are disclosed. The propulsion device for a ship according to an embodiment of the present invention includes a rear propeller fixed to a rotary shaft, a front propeller rotatably supported on a rotary shaft in front of the rear propeller, and a reverse rotation device for inverting and transmitting the rotation of the rotary shaft to a forward propeller, The reverse rotation device includes a gear box installed at the rear of the hull, a drive bevel gear installed outside the rotation shaft inside the gear box, a driven bevel gear supported rotatably around the rotation shaft inside the gear box, a driven bevel gear A first connecting member provided outside the rotating shaft and connecting the driven bevel gear and the rotating shaft, a second connecting member connected to the driven bevel gear and the hub of the forward propeller rotatably supported on the outer side of the rotating shaft, And the gear box accommodates a drive bevel gear, a driven bevel gear, and an inverted bevel gear A front cover closing the front opening of the body portion and rotatably supporting the first connection member, a rear cover closing the rear opening of the body portion and rotatably supporting the second connection member, And an inner frame rotatably supporting the inverted bevel gear, which is detachably coupled to the body portion.

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 propulsion system equipped with one propeller has a large energy loss because it can not utilize the rotational energy of the water stream due to the rotation of the propeller as a 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 propeller comprising: a rear propeller fixed to a rotary shaft; a forward propeller rotatably supported on the rotary shaft in front of the rear propeller; and an inversion rotary device for inverting and transmitting the rotation of the rotary shaft to the front propeller A drive bevel gear disposed outside the rotation shaft in the gear box, a driven bevel gear rotatably supported around the rotation shaft inside the gear box, A first connecting member provided outside the rotating shaft and connecting the driving bevel gear and the rotating shaft, a second connecting member provided outside the rotating shaft and rotatably supported by the driven bevel gear, And a second connecting member connecting the gear and the hub of the forward propeller, The gear box includes a body portion accommodating the driven bevel gear, the driven bevel gear, and the inverted bevel gear and having both ends thereof opened, a front portion opening of the body portion being closed, A rear cover closing the rear side opening of the body portion and rotatably supporting the second connection member, and a rear cover mounted to be detachable from the body portion and rotatably supporting the reverse bevel gear, A marine propulsion device including a frame may be provided.

The gear box may further include a plurality of fixing members penetrating the body portion from the outside of the body portion to enter the body portion and an inner end portion thereof supporting the inner frame in a fixed state.

The inner frame includes a through hole formed at a central portion of the inner frame so as to allow the rotation shaft to pass therethrough, and a gear mounting portion for rotatably receiving the inverting bevel gear and opening both sides of the inverting bevel gear so as to be engaged with the driven and driven bevel gear. And first and second axially supports for respectively supporting both ends of the shaft of the inverted bevel gear disposed in the radial direction of the rotation shaft.

Wherein the first and second axially supported portions receive bearings respectively coupled to both ends of the shaft of the inverted bevel gear, open toward one side of the inner frame for mounting the bearings, And can be provided with a fastening member for covering.

The reverse rotation device includes a front bearing installed between the outer surface of the first connecting member and the front cover, a rear outer bearing provided between the outer surface of the second connecting member and the rear cover, And a rear inner bearing that is installed in the rear inner bearing.

A plurality of the rear outer bearings may be continuously arranged in the longitudinal direction of the rotating shaft.

According to another aspect of the present invention, a vessel equipped with the above-described propulsion device can be provided.

The propulsion device according to the embodiment of the present invention can easily manufacture and install the gear box of the reverse rotation device in a state where the reverse rotation device is manufactured from the outside of the hull and mounted on the rear of the hull.

Further, the propulsion device according to the present embodiment is characterized in that the gear box of the reverse rotation device includes a drive bevel gear, a driven bevel gear, a body portion receiving the inverted bevel gear, front and rear covers coupled to both ends of the body portion, Since the inner frame is provided in the body portion in a state in which the inverting and rotating device is mounted, the assembling and repairing of the inverting and rotating device can be easily performed.

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

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 sectional view of the second sealing device 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, ). The rear hull 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. The inner surface of the installation space 4 can be machined into a cylindrical shape by boring so as to correspond to the outer shape of the gear box 40.

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 first connecting member 35 for connecting the rotating shaft 5 and the driven bevel gear 31 and a cylindrical second connecting member 35 for connecting the driven bevel gear 32 and the hub 11 of the front propeller 10 36).

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.

The rear propeller 20 is fixed to the rear portion of the rotary shaft 5 so as to rotate together with the rotary shaft 5, as shown in Figs. 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 second connecting member 36 coupled 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.

The inner ring of the first radial bearing 15 can be fixed so as not to be pushed in the axial direction by mounting the cylindrical wedge member 16 between the inner ring of the first radial bearing 15 and the outer surface of the rotary shaft 5 as shown in Fig. The wedge member 16 has a tapered outer surface whose outer diameter is reduced toward the rear and a thread formed on the outer surface of the rear side. The inner surface of the wedge member 16 can be press-fitted into 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. Therefore, the first radial bearing 15 can be firmly fixed between the outer surface of the rotary 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 the first connecting member 35 passing through the center portion thereof and the rear cover 43 can rotate the second connecting member 36 passing through the center portion thereof in a rotatable manner Can support. A front bearing 44 is provided between the outer surface of the first connecting member 35 and the front cover 42 and a rear outer bearing 45 is provided between the outer surface of the second connecting member 36 and the rear cover 43 Can be installed.

A plurality of rear outer bearings 45 may be provided continuously in the longitudinal direction of the rotary shaft 5 so that the second connecting members 36 can be rotated in a state of being stably supported. A rear inner bearing 46 is provided between the inner surface of the second connecting member 36 and the rotating shaft 5 for rotatable support of the second connecting member 36 and the first connecting member 35 and the rotating shaft 5, A cylindrical sleeve bearing 47 may be provided between the outer surfaces. 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 bearings 44, the rear outer bearings 45, and the rear inner bearings 46 may all be comprised of radial bearings. These bearings 44, 45, and 46 can realize stable rotation of the rotary shaft 5, the first linking member 35, and the second linking member 36 while supporting a radial load applied thereto.

The drive bevel gear 31 is connected to the first linking member 35 by fastening a plurality of fixing bolts 31a to rotate together with the first linking member 35. [ The driven bevel gear 32 is also connected to the second linking 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 sandwiched between the driven bevel gear 31 and the driven bevel gear 32, respectively. 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 . The first fastening member 54a, which covers and fixes the bearings 34a and 34b, may be mounted with the second fastening member 55a. 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 so as to penetrate the body portion 41 from the outside of the body portion 41 and into the body portion 41 so that the inner end portion thereof can hold 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 can 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 first linking member 35, and the second linking member 36 can be installed. Therefore, the reverse rotation device 30 can be easily assembled, and the repair of the fault can be easily performed later.

The inverting bevel gear 33 is rotated by the rotation of the driven bevel gear 31 to the driven bevel gear 32 so that the inverted bevel gear 33 is reversed So it does not have to be plural. 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 reverse rotation device 30 includes a power connection device 60 for detachably connecting the rotary shaft 5 and the first connection member 35. As shown in FIG. The power coupling device 60 includes a drive flange 61 provided on the rotary shaft 5 in front of the gear box 40, a driven flange 62 provided on the first coupling member 35 to face the drive flange 61, A friction member 63 interposed between the flange 61 and the driven flange 62, and a plurality of connecting bolts 64 fastened in a manner penetrating the flange 61 and the driven flange 62. The drive flange 61 may be integrally formed with the rotary shaft 5 or separately manufactured and then fixed to the rotary shaft 5 by welding or the like. The driven flange 62 may be provided integrally with the first linking member 35. The friction member 63 may be in the form of a plurality of semicircular segments so that the connecting bolt 64 can be unscrewed and then separated radially outward.

The power connection device 60 can cut off the power connection between the drive flange 61 and the driven flange 62 by releasing the plurality of connection bolts 64 and separating the friction member 63 as necessary. For example, when a failure occurs in the inverting rotating device 30 during operation of the ship, power transmission from the rotating shaft 5 to the first connecting member 35 can be blocked. In this case, the ship can be operated only by the operation of the rear propeller 20.

The second connecting member 36 has a connecting flange 37 connected to the hub 11 of the front propeller 10 at the rear end thereof. The connecting flange 37 may be integrally formed with the second 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 second connecting member 36. [

A cylindrical inner support ring 38a and an outer support ring 38b may be provided between the second linking member 36 and the outer surface of the rotary shaft 5 to support the 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 can be installed on the inner surface side of the second 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 second linking member 36 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.

When the rotary shaft 5 rotates, the first linking member 35 rotates and the drive bevel gear 31 connected to the first linking 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 second linking 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 the planetary gear type reverse rotation device, since the internal gear disposed at the outermost periphery needs to rotate, considering the casing on the outside, the volume becomes very large. 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 at the back of the hull, there arises a problem of increasing the size of the rear of the hull.

2, the propulsion device of the present embodiment includes a first seal (not shown) for sealing between the hull 3 of the hull 3 and the hub 11 of the front propeller 10 to prevent intrusion of seawater Device 90 and a second sealing device 110 for sealing between the hub 11 of the front propeller 10 and the hub 21 of the rear propeller 20 for the same purpose.

8, the first sealing device 90 includes a cylindrical first lining 91 provided on the connecting flange 37 of the second connecting member 36 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 be in contact with the outer surface of the first lining 91 and whose one end 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 oil passage 115 of the second sealing member 112 can communicate with the lubricating oil supply passage 120 provided at the center of the rotary 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, the driven flange 62 in front of the gear box 40 is provided with a second seal cover 71 similar to the above-described first seal cover 71 for sealing between the driven flange 62 and the outer surface of the rotating shaft 5, A sealing cover 72 may 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 reverse rotation device 30 includes a front sealing cover 73 sealingly covering the front bearing 44 between the front cover 42 and the first connection member 35, And a rear seal cover 74 that sealably covers the rear side of the rear outer bearing 45 between the members 36. [ 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.

 The propulsion device 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 rotary shaft 5 in front of the gear box 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 first connecting member 35, and a second connecting member 35. The inner frame 50 includes a body 41, an inverted bevel gear 33, The front cover 42, the front bearing 44, the second 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 installed between the connecting flange 37 of the second 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. Then, the center of the rotary shaft 5 and the center of the main drive shaft 6 are aligned with each other.

The front fixing member 48a is provided on the front side and the rear side of the gear box 40 as shown in Fig. 7 after the reverse rotation device 30 enters the installation space 4 of the rear hull 3, And the rear fixing member 48b are provided to fix the gear box 40 to the rear hull 3 of the hull. 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 fixing the gear box 40 to the rear hull 3, the main drive shaft 6 and the rotary shaft 5 are connected by a coupling device 7 and the second radial bearing 81 And third and fourth thrust bearings 82 and 83 so that the rotary 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 second 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: first connecting member,
36: second 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: Power connection device, 61: Driving flange,
62: driven flange, 63: friction member,
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 (7)

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 inverting the rotation of the rotation shaft by the front propeller,
The reverse rotation device includes a gear box, a drive gear disposed outside the rotation shaft in the gear box, a driven gear rotatably supported around the rotation shaft in the gear box, A first connecting member provided outside the rotating shaft and connecting the driving gear to the rotating shaft, a second connecting member connected to the driven gear and the hub of the forward propeller, the second connecting member being rotatably supported outside the rotating shaft, Member,
Wherein the gear box includes a body portion accommodating the drive gear, the driven gear, and the reverse gear and having both ends thereof opened, a front cover closing the front side opening of the body portion and rotatably supporting the first connecting member, And a rear cover for closing the rear opening of the body portion and for rotatably supporting the second linking member, wherein the drive gear, the driven gear, the reverse gear, the body portion, the front cover, Is installed in such a manner that it can enter from the outside of the hull rear part to the installation space of the hull rear part and advance from the installation space to the outside of the hull rear part. The method according to claim 1,
And an inner frame rotatably supporting the reversing gear so as to be detachable from the body,
Wherein the gear box further comprises a plurality of fixing members penetrating through the body from the outside of the body to enter the body and the inner end of the gearbox holding the inner frame in a fixed state. 3. The method of claim 2,
A through hole formed at a central portion of the inner frame so as to allow the rotation shaft to pass therethrough; a gear mounting portion rotatably receiving the reversing gear and having both sides thereof opened so that the reversing gear can be engaged with the driven and driven gear; And first and second shafts supporting the both ends of the shaft of the reversing gear disposed in the radial direction of the rotating shaft. The method of claim 3,
Wherein the first and second axially extending portions receive bearings respectively coupled to both ends of the shaft of the reverse gear, open in one lateral direction of the inner frame for mounting the bearings, A propulsion device for a ship having a fastening member. The method according to claim 1,
The reverse rotation device includes a front bearing installed between the outer surface of the first connecting member and the front cover, a rear outer bearing provided between the outer surface of the second connecting member and the rear cover, And a rear inner bearing installed on the rear inner bearing. 6. The method of claim 5,
Wherein a plurality of said rear outer bearings are arranged continuously in the longitudinal direction of said rotary shaft. A ship equipped with the propulsion device according to any one of claims 1 to 6.

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