KR101390837B1 - 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. A propulsion device for a ship according to an embodiment of the present invention includes a forward propeller and a rear propeller disposed at the rear of a hull, and a reverse rotation device that implements a counterclockwise rotation between a forward propeller and a rear propeller, A rotating shaft through which the rear propeller is fixed to the outer surface at the rear end side and the front propeller is rotatably supported on the outer surface between the rear propeller and the housing, a rotating shaft through which the front propeller is rotatably supported on the outer surface between the rear propeller and the housing, A driven gear which is rotatably supported in the housing and is connected to the hub of the forward propeller, at least one reverse gear which inverts and transmits the rotation of the drive gear to the driven gear, and a gear installation hole penetrating through the housing in a radial direction And the reverse gear includes a rotary shaft, a drive gear, and a driven gear Is installed in the housing and is inserted into the housing through the gear installation hole.

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 Patent Application Laid-Open No. 62-279189 (published on December 04, 1987) disclose an example of a double- There is a bar. US Patent Application Publication No. US2011 / 0033296 discloses a double reversing propulsion device having a hollow shaft and a planetary gear type reverse rotation device installed in a hull. Japanese Patent Laid-Open Publication No. 62-279189 discloses a planetary gear type reverse rotation device A dual inversion rotating device is disclosed.

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)

The embodiment of the present invention is to provide a propulsion device for a ship that can simplify the power transmission system and simplify the maintenance of the two propellers while maintaining stable mutual inversion, and a ship equipped with the propulsion device.

The embodiments of the present invention are intended to provide a propulsion device for a ship that is easy to manufacture and install, and a ship equipped with the propulsion device.

According to an aspect of the present invention, there is provided a propulsion apparatus for a ship including a forward propeller and a rear propeller disposed at the rear of a hull, and an inversion rotating device that implements a counterclockwise rotation of the forward propeller and the rear propeller, The rear propeller being fixed to an outer surface of a rear end side of the housing, the front propeller being rotatably supported on an outer surface between the rear propeller and the housing, A driving gear fixed to the rotating shaft inside the housing, a driven gear rotatably supported inside the housing and connected to a hub of the front propeller, and at least one of a driven gear connected to the hub of the forward propeller, A reverse gear, a radial tube The installation comprises a ball gear, the reverse gear may be mounted to enter into the housing interior through the installation hole in the rotating shaft and the gear and the drive gear and the driven gear is mounted on the housing state.

The propulsion device further includes a closing member coupled to the gear mounting hole to close the gear mounting hole and a reverse gear shaft provided on the inner surface of the closing member toward the inside of the housing to rotatably support the reverse gear .

The closing member may include a flange portion fixed to the housing by bolting and at least one gap adjusting plate may be provided between the flange portion and the housing to adjust the degree of engagement of the reverse gear.

Wherein the gear installation hole has an inner diameter larger than the outer diameter of the reversing gear, and the closing member has an entrance portion protruding from the inner surface of the flange portion to enter the gear installation hole, wherein an outer diameter of the flange portion is larger than an inner diameter And the outer diameter of the entrance portion may be a size corresponding to the inner diameter of the gear installation hole.

The housing may be detachably mountable to the rear of the hull.

The housing may include a bolt fastening portion provided along a circumference of a front end coupled to a rear end of the hull.

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

Since the inverting bevel gear can be installed or separated into the housing through the gear installation hole of the housing, the propelling device according to the embodiment of the present invention can easily mount the inverted bevel gear, So that the trouble-shooting operation can be easily performed.

Further, since the propelling device according to the embodiment of the present invention can regulate the degree of entry of the inverted bevel gear through a gap adjusting plate between the closing member closing the gear setting hole and the housing, the driving and driven bevel gears and the inverted bevel gears Bite distance can be easily adjusted.

Further, since the propulsion device according to the embodiment of the present invention can mount the housing of the reversing and rotating device on the rear of the hull in a state where the reversing and rotating device is assembled, the manufacturing and installation can be easily performed.

In addition, since the housing of the reversing and rotating 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 a cross-sectional view showing the structure of a support ring of the propulsion device according to the embodiment of the present invention.
5 is a sectional view showing an example of mounting a propeller of a propulsion device according to an embodiment of the present invention.
6 is a cross-sectional view illustrating a state in which the inversion rotating device of the propulsion device according to the embodiment of the present invention is separated from the rear of the hull.
7 is a cross-sectional view illustrating a state in which the inversion rotating device of the propulsion device according to the embodiment of the present invention is mounted on 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, 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, a front propeller 10 and a rear propeller 20, (30) mounted on the rear (3) of the hull (1) in order to realize the opposite rotation of the hull (1, 10, 20) 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, ).

2 and 3, the inverter 30 includes a housing 31 that is detachably mountable to the rear end 3 of the hull 1, And a rotating shaft 40 rotatably supported on the housing 31 in a state of passing through the rotating shaft 40.

The reverse rotation device 30 includes a drive bevel gear 33 fixed to a rotary shaft 40 inside the housing 31, a rotary bevel gear 33 rotatably supported on a rotary shaft 40 inside the housing 31, A plurality of inverting bevel gears 35 for transferring the rotation of the driven bevel gear 33 to the driven bevel gear 34 and transmitting the rotation of the driven bevel gear 33 to the driven bevel gear 34 and the driven bevel gear 34 and the forward propeller 10 And a connecting member 37 connected to the hub 11 of the vehicle.

The front end portion of the rotary shaft 40 protruding forward of the housing 31 is connected to the main drive shaft 5 inside the hull 1. As shown in FIG. 1, the main drive shaft 5 is connected to a driving source 4 (a diesel engine, a motor, a turbine or the like) installed inside the hull 1 so that the rotary shaft 40 can rotate together. A rear propeller 20 is fixed to a rotary shaft 40 extending to the rear of the housing 31 and a front propeller 10 is rotatably supported on an outer surface between the rear propeller 20 and the housing 31. The front propeller 10 is connected to the driven bevel gear 34 of the reverse rotation device 30 so as to rotate in the reverse direction of the rear propeller 20 when the rotation shaft 40 rotates,

The main drive shaft 5 and the rotation shaft 40 may be connected to each other by a coupling device 6 of a cylindrical shape so as to be separated and coupled by a spline shaft joining method. Here, the spline shaft splicing method is shown as an example, but the connection method of the main drive shaft 5 and the rotation shaft 40 is not limited thereto. A flange coupling system, a friction clutch system, a magnetic clutch system, or the like can be selectively employed.

 2, the rotary shaft 40 has a multi-stage outer surface for installing internal components of the reverse rotation device 30, the front propeller 10, and the rear propeller 20 on the outer side thereof. . The first outer diameter portion 41 and the second outer diameter portion 41 are located in the housing 31 and have a relatively large diameter. The first outer diameter portion 41 is provided behind the first outer diameter portion 41 with a smaller diameter than the first outer diameter portion 41, A third outer diameter portion 43 provided at a rear side of the second outer diameter portion 42 and smaller in diameter than the second outer diameter portion 42 and fixed to the rear propeller 20, . The outer surface of the third outer diameter portion 43 may be a tapered surface whose outer diameter gradually decreases toward the rear in order to fix the rear propeller 20. The first outer diameter portion 41 may be provided with a flange portion 44 for mounting the drive bevel gear 33. The flange portion 44 may be integrally formed with the rotary shaft 40 or may be separately manufactured and then press-fitted into the outer surface of the rotary shaft 40.

The rear propeller 20 includes a hub 21 fixed to the rear portion of the rotary shaft 40 and a plurality of blades 22 provided on the outer surface of the hub 21. [ The rear propeller 20 is provided with a fixing nut 24 at the rear end of the rotary shaft 40 in a state in which the shaft coupling hole 23 formed at the center of the hub 21 is pressed into the outer surface of the third outer diameter portion 43 of the rotary shaft 40, So that it can be firmly fixed to the rotary shaft 40. For this coupling, the shaft coupling hole 23 of the hub 21 may have a tapered surface whose inner surface corresponds to the outer surface of the third outer diameter portion 43. [ 2, reference numeral 25 denotes a propeller cap mounted on the rear propeller 20 hub 21 so as to cover the rear surface of the rear propeller 20 hub 21 and the rear end of the rotary shaft 40. [

The front propeller 10 is rotatably installed on the outer surface of the rotary shaft 40 at a position spaced forward from the rear propeller 20. The front propeller 10 includes a hub 11 rotatably supported on the outer surface of the rotary shaft 40 and a plurality of blades 12 provided on the outer surface of the hub 11. Since the front propeller 10 rotates in a direction opposite to that of the rear propeller 20, the angle of the wing is opposite to the angle of the wing of the rear propeller 20.

The hub 11 of the front propeller 10 can be rotatably supported by the radial bearing 71 and its both sides can be rotated by the front thrust bearing 72 and the rear thrust bearing 73, It can be supported as much as possible.

The front thrust bearing 72 can be supported by the stepped portion where the inner ring is provided between the second outer diameter portion 42 and the first outer diameter portion 41 of the rotary shaft 40, And can be supported by the bearing support portion 11a. The rear thrust bearing 73 can be supported so that the inner ring is not pushed axially by the support ring 80 mounted on the outer surface of the rotary shaft 40 and the outer ring is supported on the rear bearing support portion 11b of the hub 11 .

Therefore, the radial bearing 71 can bear the radial load of the front propeller 10 acting in the radial direction of the rotary shaft 40, and the front and rear thrust bearings 72, The thrust load acting in each direction can be handled. In particular, the front thrust bearing 72 suffers a thrust load acting on the forward side from the forward propeller 10 when the ship is advanced, and the rear thrust bearing 73 supports the thrust which acts on the stern side from the forward propeller 10 when the ship is backward. The load can be accommodated.

The front and rear bearing supports 11a and 11b of the front propeller 10 may be made of a steel material having higher rigidity than the hub 11. [ In the same manner, a reinforcing member 21a of a similar shape may be provided on the front surface of the hub 21 of the rear propeller 20 at a portion contacting the supporting ring 80. [

4, the support ring 80 includes a semicircular first support ring 81 and a second support ring 82 split on both sides and engagement bolts 83 for fastening them, Lt; / RTI > 5, the support ring 80 is provided with a front propeller 10 and a rear thruster bearing 73 on the rotary shaft 40, and then the rear propeller hub 21 is press- 40 can be installed between the rear propeller hub 21 and the rear thrust bearing.

When the support ring 80 is installed, the rear propeller 20 is assembled first, and the distance between the rear thrust bearing 73 and the rear propeller hub 21 is measured. 40, it is possible to realize accurate coupling. 4, the divided first support ring 81 and the second support ring 82 are coupled to the outer surface of the rotary shaft 40 and then fixed by fastening the engagement bolts 83 on both sides thereof. have. When the rear propeller 20 is installed on the rotary shaft 40 in a press-fitting manner, there arises a coupling error between the rear propeller 20 and the rear thrust bearing 73 and the rear propeller hub 21 It is difficult to keep the distance between them accurately.

2, 3 and 6, the housing 31 of the inverting and rotating device 30 is provided with a bolt fastening portion 31, which is provided along the periphery of the front end portion thereof so as to be mounted on the rear end 3 of the hull 1, (38). The bolt fastening portion 38 may be composed of a flange portion 38a formed along the periphery of the housing 31 and a plurality of bolt fastening holes 38b formed in a state of being spaced apart from each other in the flange portion 38a. The housing 31 can be mounted on the hull rear 3 by fastening a plurality of fixing bolts 38c in a state where parts of the inverter 30 are assembled inside.

The outer surface of the housing 31 may include a curved surface portion connected to the curved surface of the outer surface of the hull rear 3 side. That is, from the outer surface of the rear end of the hull 3 to the rear of the housing 31, in a progressively decreasing sectional area.

6, when the housing 31 is coupled to the rear end 3 of the hull 1, at least one sealing (not shown) is provided between the housing 31 and the hull rear 3 so that the watertightness of the coupling portion can be maintained, A member 39 may be interposed. The sealing member 39 may be a gasket, a rubber ring, or the like, and a coupling groove for receiving the sealing member 39 may be formed on a front surface or a stern portion of the housing 31 at a position where the sealing member 39 is engaged. As shown in FIG. 7, the outer surface of the portion where the housing 31 and the hull rear part 3 are coupled is covered with the sealing material 50 so that the watertightness of the coupling part is maintained and corrosion can be prevented. The sealing material 50 may be a filling material such as cement filled in gaps or grooves of the engaging portion, a paint such as paint applied to the outer surface of the engaging portion, or a sheet-like cover attached to the outer surface of the engaging portion.

A plurality of inverting bevel gears 35, a driven bevel gear 34 and a part of the connecting member 37 can be accommodated in the housing 31, The gear chamber 32 is opened. A cover member (51) for covering the rear surface of the gear chamber (32) is provided on the open rear surface of the gear chamber (32).

The driving bevel gear 33 is fixed to the flange portion 44 of the rotary shaft 40 by fastening a plurality of fixing bolts 33a. The driven bevel gear 34 is fixed to the connecting member 37 by fastening a plurality of fixing bolts 34a in a state where the driven bevel gear 34 faces the driving bevel gear 33 at a spaced-apart position. The driven bevel gear 34 is spaced apart from the rotary shaft 40 so that the inner diameter portion of the driven bevel gear 34 is not interfered with the rotary shaft 40 during rotation.

The plurality of inverted bevel gears 35 are interposed between the driven bevel gear 33 and the driven bevel gear 34 in a bite state. An inverted bevel gear shaft 36 supporting each of the inverted bevel gears 35 extends in a direction intersecting with the rotary shaft 40 and a plurality of the inverted bevel gear shaft 36 can be radially arranged around the rotary shaft 40.

6, the plurality of inverted bevel gears 35 are installed in such a manner as to enter the inside of the housing 31 through a plurality of gear installation holes 61 penetrating in the radial direction of the housing 31 . To this end, the gear mounting hole 61 of the housing 31 is formed to be larger than the outer diameter of the inverted bevel gear 35. Each gear mounting hole 61 is provided with a closing member 62 capable of closing the gear mounting hole 61. The reverse bevel gear shaft 36 is fixed to the inner surface of the closing member 62, 62, respectively. A bearing 35a may be provided between the inverted bevel gear 35 and the inverted bevel gear shaft 36 for smooth rotation of the inverted bevel gear 35.

The closing member 62 includes a flange portion 62a fixed to the outer surface of the housing 31 by fastening of the fixing bolt 62c and a flange portion 62b extending from the inner surface of the flange portion 62a to the gear mounting hole 61 And a portion 62b. The flange portion 62a is provided such that its outer diameter is larger than the inner diameter of the gear attachment hole 61 so that the flange portion 62a can be fastened in the state of being hooked on the housing 31. The entrance portion 62b is formed in a shape corresponding to the inner diameter of the gear attachment hole 61 Outer diameter.

The closing member 62 is fixed to the housing 31 by the flange portion 62a in a state in which the entering portion 62b enters into the gear mounting hole 61 and is tightly supported on the inner surface of the gear mounting hole 61, The bevel gear shaft 36 can be supported without shaking and the gear mounting hole 61 can be closed.

At least one gap adjusting plate 63 may be provided between the flange portion 62a and the housing 31 to adjust the degree of engagement of the inverted bevel gear 35. The number of the interval adjusting plates 63 is increased when the engaging portion interval between the driven and driven bevel gears 33 and 34 and the inverted bevel gear 35 is small and conversely the number of the interval adjusting plates 63 is increased It is a method to reduce or remove.

As described above, in this embodiment, the inverted bevel gear 35 and the closing member 62 enter the gear installation hole 61 in a state where the inverted bevel gear 35 and the closing member 62 are assembled from the outside of the housing 31 So that the inverted bevel gear 35 can be easily mounted inside the housing 31. Since the degree of entry of the inverted bevel gear 35 can be adjusted between the flange portion 62a of the closing member 62 and the housing 31 through the gap adjusting plate 63, the driving and driven bevel gears 33 and 34 ) And the inverted bevel gear 35 can be easily adjusted. In addition, since the closing member 62 can be separated from the housing 31 to separate the inverting bevel gear 35, it is possible to easily carry out the inspection and repair work inside the housing 31. [

7, after the closure member 62 is mounted on the housing 31 and the inverted bevel gear 35 is installed, the outer surface of the housing 31 at the position where the closure member 62 is to be mounted, (64) to seal the joint. When the filling material 64 is filled in this manner, the outer surface of the housing 31 at the position where the closing member 62 is mounted can be maintained in a smooth curved surface. As the filler 64, cement or the like may be used.

It is to be noted that the reversing bevel gear 35 may be capable of reversing the rotation of the driven bevel gear 33 to the driven bevel gear 34 so that a plurality of inverted bevel gears 35 . A small ship with a small driving load would be able to implement its function with only one inverted bevel gear.

The connecting member 37 is provided in a cylindrical shape having an inner diameter larger than the outer diameter of the rotary shaft 40 and is rotatably supported on the rotary shaft 40 in a state of being fitted to the outer surface of the rotary shaft 40. The connecting member 37 is rotatably supported by the driven bevel gear 34 by being connected to the driven bevel gear 34 at one end as described above. And the opposite end is fixed to the hub 11 of the front propeller 10 by fastening a plurality of fixing bolts 37a so that the rotation of the driven bevel gear 34 can be transmitted to the front propeller 10.

Between the inner surface of the connecting member 37 and the outer surface of the rotating shaft 40, a first inner bearing 54 and a second inner bearing 55 for rotatably supporting the connecting member 37 are installed on both sides, respectively. An inner support ring 56a interposed between the inner ring of the first inner bearing 54 and the inner ring of the second inner bearing 55 to support the inner ring of the first inner bearing 54 and the inner ring of the first inner bearing 55 between the connecting member 37 and the outer surface of the rotary shaft 40, An outer support ring 56b interposed between the outer ring of the inner bearing 54 and the outer ring of the second inner bearing 55 and supporting them is provided. The inner support ring 56a and the outer support ring 56b allow the first inner bearing 54 and the second inner bearing 55 to be stably supported in a state in which they are spaced apart from each other. A support ring 56c for preventing the second inner bearing 55 from separating may be provided on the end of the connecting member 37 which is engaged with the hub 11 of the front propeller 10. Between the outer surface of the connecting member 37 and the cover member 51, an outer bearing 57 for rotatably supporting the outer surface of the connecting member 37 is provided.

Thus, the connecting member 37 is supported by the first and second inner bearings 54 and 55, and the outer surface thereof is supported by the outer bearing 57, so that the connecting member 37 can rotate while maintaining stable engagement. The driven bevel gear 34 can also be stably rotated by the connecting member 37 supporting the driven bevel gear 34. [ The inner surface of the connecting member 37 and the outer surface of the rotating shaft 40 are kept separated by the first and second inner bearings 54 and 55 so that the connecting member 37 and the rotating shaft 40 rotate in opposite directions However, smooth rotation can be realized. Particularly, the shape in which the inner surface of the connecting member 37 and the outer surface of the rotating shaft 40 are spaced apart as described above can prevent the stagnation of the lubricating oil filled between them by the opposite rotation.

The cover member 51 that covers the opening of the rear surface of the gear chamber 32 includes a first cover member 52 in the form of a ring having a tapered outer surface coupled to the outside of the outside bearing 57, And a second cover member 53 coupled between the outer surface and the rear end of the housing 31 and having a tapered inner surface corresponding to the outer surface of the first cover member 52. The first cover member 52 can be press-fitted to the outer ring of the outer bearing 57 and the second cover member 53 can be engaged with the outer ring of the outer bearing 57 by being inserted into the gap between the first cover member 52 and the housing 31 And then fixed to the rear end of the housing 31 by fastening a plurality of fixing bolts 53a. The outer surface of the first cover member 52 and the inner surface of the second cover member 53, which are in contact with each other, are made of inclined tapered surfaces, so that they can be easily combined.

The reverse rotation device 30 reverses the rotation of the drive bevel gear 33 and transfers the rotation of the drive bevel gear 33 to the driven bevel gear 34 so that the driven bevel gear 34 and the driven bevel gear 33 rotate, It is possible to rotate in the opposite direction. The rotation of the driven bevel gear 34 is transmitted to the front propeller 10 by the connecting member 37. Therefore, it is possible to realize the opposite rotation of the front propeller 10 and the rear propeller 20.

Also, since the inversion device 30 of the present embodiment implements the mutual inversion of the two propellers 10, 20 through the plurality of bevel gears 33, 34, 35, The volume can be reduced. Therefore, the volume of the housing 31 mounted on 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 reverse rotation device 30 includes a radial bearing (not shown) interposed between the housing 31 at the front of the drive bevel gear 33 and the outer surface of the rotary shaft 40 for stable rotation of the rotary shaft 40 And an axial force transmitted from the front and rear propellers 10 and 20 to the rotary shaft 40 in front of the radial bearing 58 to the rear end 3 of the hull through the housing 31 And includes front and rear thrust bearings (59a, 59b). The radial bearing 58 can support the rotary shaft 40 immediately before the drive bevel gear 33 to prevent radial vibration or shaking of the rotary shaft 40 and prevent the front and rear thrust bearings 59a, It is possible to prevent axial displacement or vibration of the rotary shaft 40. [ Therefore, it is possible to accurately hold the bite between the drive bevel gear 33 and the inverted bevel gear 35 and the bite between the inverted bevel gear 35 and the driven bevel gear 34.

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 comprises a cylindrical first lining 91 provided on the front surface of the front propeller hub 11 and a second lining 91 formed on the front surface of the first lining 91 so as to be in contact with the outer surface of the first lining 91. [ And a cylindrical first sealing member 92 that covers the outer surface and has one end fixed to the second cover member 53.

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 may be connected to the lubricating oil supply passage 96 provided in the housing 31 and the second cover member 53 so that lubricating oil having a predetermined pressure can be supplied. 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.

9, the first lining 91 includes a first member 91a and a second member 92b that are divided into semicircles on both sides so as to be mountable after the forward propeller 10 is installed on the rotary shaft 40, 91b. 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 91h fixed to the hub 11 of the front propeller 10 can be firmly fixed to the hub 11 by fastening a plurality of fixing bolts 91i.

The first sealing member 92 may also be a method of stacking and fixing a plurality of semicircular rings 92a, 92b and 92c in the longitudinal direction of the rotary shaft 40 from the outside of 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 40. [ A first connection passage 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 40 and the support ring 80, A second connection channel 123 for communicating the inner space 122 of the second lining 111 and the flow passage 115 of the second sealing member 112 is formed in the rear bearing support portion 11b of the rear surface of the propeller hub 11 . Therefore, the lubricant supplied from the central portion of the rotary shaft 40 to the second sealing member 112 can press the packings 113a, 113b, and 113c, thereby achieving the 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 so that the rear propeller 20 After the support ring 80 is installed.

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, first, when assembling the propulsion device, the parts of the reverse rotation device 30 are assembled to the housing 31. The drive bevel gear 33, the inverted bevel gear 35, the driven bevel gear 34, the closing member 62, the connecting member 37, and the cover member 51 are attached to the housing 31 Assemble. Such a reverse rotation device 30 can be assembled after machining each part in a separate manufacturing factory, and thus it is possible to manufacture precisely.

The assembled inversion device 30 is transferred to a dock or the like for manufacturing the hull 1 by means of a transportation means and is then coupled to the rear end 3 of the hull 1. In this case, a lifting device such as a crane for lifting the reverse rotation device 30 may be used. When the reversing and rotating device 30 is engaged, first, the housing 31 of the reversing and rotating device 30 is aligned with the joining position of the rear hull 3. Of course, at this time, one or more sealing members 39 are interposed between the housing 31 and the rear end 3 of the hull 1. A plurality of fixing bolts 38c are fastened to the bolt fastening portions 38 provided around the front end of the housing 31 to fix the housing 31 to the hull 1 and to fix the main drive shaft 5 and the rotary shaft 40, To the coupling device (6). The reverse rotation device 30 coupled to the hull 1 by the bolt fastening method can easily separate the reverse rotation device 30 from the hull 1 when a failure or the like occurs in the future, . Therefore, fault repair can be easily performed.

After the reverse rotation device 30 is coupled to the rear end 3 of the hull 3, the sealing material 50 is sealed on the outer surface of the joining portion of the housing 31 and the hull rear 3 as shown in Fig. Sealing the joint portion in this manner can prevent seawater from penetrating into the joint portion and prevent corrosion of the joint portion.

1 and 2, the front propeller 10, the rear propeller 20, and the associated parts (not shown) are attached to the rotary shaft 40 of the reverse rotation device 30 after the completion of the installation of the reverse rotation device 30. [ And the first sealing device 90 and the second sealing device 110 are mounted, thereby completing the installation.

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

When the rotary shaft 40 rotates by the operation of the internal drive source 4 of the hull 1, the propeller 20 rotates together with the rear propeller 20 in the same direction as the rotary shaft 40, directly connected to the rear end of the rotary shaft 40 . At the same time, the driving bevel gear 33 of the reverse rotation device 30 is also fixed to the rotary shaft 40, and thus rotates together with the rotary shaft 40. The rotation of the driven bevel gear 33 is reversed by the plurality of inverted bevel gears 35 and is transmitted to the driven bevel gear 34 so that the driven bevel gear 34 rotates in the direction opposite to the rotating shaft 40. Therefore, the front propeller 10 connected by the driven bevel gear 34 and the connecting member 37 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 (40) through the front thrust bearing (72) and acts as propulsive force. The rear propeller 20 is also subjected to a reaction force because it generates propellant water rearward when it is advanced, and this force is also transmitted to the direct-coupled rotary shaft 40 and acts as propulsive force.

The propulsion force of the front propeller 10 is transmitted to the rotary shaft 40 through the rear thrust bearing 73 and the propulsive force of the rear propeller 20 is also transmitted to the direct rotary shaft 40 when the ship is backward. As a result, the propulsion device of the present embodiment is characterized in that the propulsive force generated by the operation of the front propeller 10 and the rear propeller 20 when the ship is moving forward and backward is transmitted to both the rotary shaft 40 and the front and rear thrust bearings 59a and 59b To the rear end 3 of the hull.

1: hull, 4: driving source,
3: rear of hull, 10: forward propeller,
20: rear propeller, 30: reverse rotation device,
31: housing, 32: gear chamber,
33: driven bevel gear, 34: driven bevel gear,
35: inverted bevel gear, 37: connecting member,
38: bolt fastening portion, 40: rotating shaft,
50: sealing material, 51: cover member,
54: first inner bearing, 55: second inner bearing,
57: Outside bearing, 61: Gear mounting ball,
62: closing member, 71: radial bearing,
72: front thrust bearing, 73: rear thrust bearing,
80: support ring, 90: first sealing device,
110: Second sealing device.

Claims (7)

A propulsion device for a ship including a forward propeller and a rear propeller disposed at the rear of a hull and an inversion device for implementing a counterclockwise rotation of the forward propeller and the rear propeller,
The reverse rotation device
A housing detachably coupled to the rear of the hull at the rear of the hull,
A rotary shaft through which the rear propeller is fixed to the outer surface at the rear end side and the front propeller is rotatably supported at the outer surface between the rear propeller and the housing,
A driving gear fixed to the rotating shaft inside the housing,
A driven gear rotatably supported in the housing and connected to the hub of the forward propeller,
One or more reverse gears for inverting and transmitting rotation of the driving gear to the driven gear,
And a gear mounting hole penetrating radially in the housing,
Wherein the reversing gear is inserted into the housing through the gear installation hole while the rotation shaft, the driving gear, and the driven gear are mounted on the housing. The method according to claim 1,
A closing member coupled to the gear mounting hole to close the gear mounting hole and a reverse gear shaft provided on the inner surface of the closing member toward the inside of the housing to rotatably support the reverse gear. 3. The method of claim 2,
Wherein the closure member includes a flange portion fixed to the housing by bolting,
Wherein at least one gap adjusting plate is provided between the flange portion and the housing to adjust the degree of engagement of the reverse gear. The method of claim 3,
Wherein the gear installation hole has an inner diameter larger than an outer diameter of the reverse gear,
Wherein the flange portion has an outer diameter larger than an inner diameter of the gear installation hole and an outer diameter of the entrance portion corresponds to an inner diameter of the gear installation hole Ship propulsion system. The method according to claim 1,
Wherein the housing is detachably mountable to the rear of the hull. 6. The method of claim 5,
Wherein the housing includes a bolt fastening portion provided along the periphery of the front end coupled to a rear end of the hull. A ship equipped with the propulsion device according to any one of claims 1 to 6.

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