KR20150076811A - Propulsion apparatus for ship, and ship having the same - Google Patents

Abstract

A propulsion apparatus for a ship and a ship having the same are disclosed. According to an embodiment of the present invention, the propulsion apparatus for a ship includes: a rear propeller fixated to a propeller shaft; a front propeller supported in the propeller shaft in front of the rear propeller to be rotated; a reverse rotation device mounted in an installation space at the rear of a hull to reverse the rotation of the propeller shaft to deliver it to the front propeller; a propulsion support device provided on the rear side of the reverse rotation device to protrude from the rear of the hull to the rear side of the hull in order to support the propulsion of the front propeller; a rope guard provided between the rear of the hull and a hub of the front propeller; and at least one reinforcement member to support the rope guard toward the outside of the hull.

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.

U.S. Patent No. 4,540,369 discloses a dual inversion propeller drive system including a planetary gear inversion device installed at the rear of the hull.

However, in the double inverted propeller of the above publication, since the inverting rotating device is provided on the hub of the forward propeller, the size of the stern boss and the propeller hub is increased, and the propulsion efficiency of the propulsion device is reduced. There is a problem that the durability is deteriorated due to exposure to seawater and maintenance is difficult.

Patent Document 1: U.S. Patent No. 4540369 (published on September 10, 1985)

The embodiment of the present invention is to provide a propulsion device for a ship capable of realizing stable mutual inversion of two propellers as well as forming a linear shape of the rear of the ship so as to improve hydrodynamic performance and a ship including the propulsion device.

It is another object of the present invention to provide a propulsion device for a ship capable of reducing the diameter of a hub of a forward propeller and improving propulsion performance and a ship including the propulsion device.

The embodiments of the present invention also provide a propulsion device for a ship capable of improving inspection and maintenance of an inversion device and a ship including the device.

According to an aspect of the present invention, there is provided a propeller comprising: a rear propeller fixed to a propeller shaft; a front propeller rotatably supported on the propeller shaft in front of the rear propeller; A thrust supporting device provided at the rear of the inversion device to support the thrust of the forward propeller so as to protrude from the rear of the hull at the rear of the hull; A rope guard provided between the hubs of the propeller and at least one reinforcing member for supporting the rope guard in the outboard direction of the hull can be provided.

The front end of the rope guard corresponds to the diameter of the back of the hull, the rear end of the rope guard corresponds to the diameter of the hub of the front propeller, and the diameter decreases toward the rear so that the streamlined linear shape of the hull is maintained.

The front end of the rope guard may be fixed to the rear edge of the hull and the rear side may be adjacent to the hub edge of the front propeller.

The reverse rotation device includes a reverse gear unit for reversing the rotation of the propeller shaft, and a gear box, which houses the reverse gear unit and has an outer surface corresponding to the inner surface shape of the installation space, can do.

One end of the reinforcing member may support the inner surface of the rope guard and the other end may be supported by at least one of the housing of the thrust support apparatus and the outer surface of the gear box.

The reinforcing member may include a first flange portion in surface contact with the housing and a second flange portion in surface contact with at least one of an inner surface of the rope guard and an outer surface of the gear box.

And a casing coupled to the rear of the hull so as to surround the rear surface of the inverting and rotating unit and extending toward the rear of the hull to form an outer surface of the hull, and the thrust supporting apparatus can be coupled to the rear of the casing.

The rope guard may have one end fixed to the casing and the other end adjacent to the front propeller hub.

The reinforcing member may include a first reinforcing member and a second reinforcing member divided on both sides.

According to another aspect of the present invention, there is provided a propeller propeller comprising: a rear propeller fixed to a propeller shaft; a front propeller rotatably supported on the propeller shaft in front of the rear propeller; A thrust supporting device provided at the rear of the inversion device to support the thrust of the forward propeller so as to protrude rearward of the hull at the rear of the hull, a sealing device for sealing between the thrust supporting device and the front propeller hub, And a rope guard which is provided between a rear end of the hull and a hub of the front propeller so as to surround the thrust supporting device and the sealing device and whose diameter decreases toward the rear so as to maintain the streamlined linear shape of the hull. .

According to another aspect of the present invention, there is provided a propeller comprising: a rear propeller fixed to a propeller shaft; a front propeller rotatably supported on the propeller shaft in front of the rear propeller; And a gear box formed in the rear of the hull so as to be opened in a rear direction of the hull so that the reverse rotation device can be installed from the outside of the hull, A thrust supporting device provided at the rear of the inversion rotating device so as to protrude rearward of the hull at the rear of the hull to support thrust of the forward propeller; And is provided between the hubs of the forward propellers and maintains the streamlined linearity of the hull It can be provided with a vessel containing the rope guard that is small in diameter toward the rear.

The rear propeller may further include at least one reinforcing member for supporting the rope guard in the outboard direction of the hull.

One end of the reinforcing member may support the inner surface of the rope guard and the other end may be supported by at least one of the housing of the thrust support apparatus and the outer surface of the gear box.

The propelling device according to the present embodiment includes a propeller connecting member for transmitting the rotational force of the inversion rotating device to the forward propeller to the outside of the inversion rotating device and a casing for enclosing the propeller connecting member to the rear of the hull, The propulsion performance of the ship can be improved by reducing the diameter of the rear portion of the hull extending to the hub of the forward propeller.

In addition, the propulsion device according to the present embodiment is characterized in that a casing and a thrust support device are disposed between the rear end of the hull and the front propeller so as to increase the distance between the rear end of the hull and the front propeller, thereby reducing the diameter of the front propeller hub, The wing can be formed and the propulsion performance of the ship can be improved.

Further, the propulsion device according to the embodiment of the present invention can facilitate access to the thrust support device by providing the thrust support device in a detachable manner at the position exposed from the rear of the reverse rotation device to the outside of the hull, The convenience of maintenance can be improved.

In addition, the propulsion device according to the present embodiment can be manufactured and installed easily since the inverting and rotating device can be manufactured from the outside of the hull and assembled from the rear of the hull to the installation space at the rear of the hull. have.

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, 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 is applied to a ship.
2 is a cross-sectional view of the propulsion device according to one embodiment.
3 is an exploded perspective view of the propulsion device according to one embodiment.
FIG. 4 is a cross-sectional view illustrating an example of mounting an inverting rotary device of a propulsion device according to an embodiment, and shows a state in which the reverse rotation device is separated.
FIG. 5 is a cross-sectional view illustrating an example of mounting an inverting rotary device of a propulsion device according to an embodiment, and shows a state in which an inverting rotary device is mounted.
6 is a sectional view of the first sealing device of the propulsion device according to the embodiment of the present invention.
7 is a sectional view of the second sealing device of the propulsion device according to the embodiment of the present invention.
8 is a cross-sectional view of a propulsion device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

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. In other words, the two propellers 10 and 20 rotate in opposite directions to generate propulsive force.

The rear end 3 of the hull 1 referred to in the present embodiment is a portion protruding rearward from the hull 1 in a streamline form for installation of the front and rear propellers 10 and 20 and the reverse rotation device 30 Stern boss (Stern boss) means. 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 installation space 4 is formed in a cylindrical hollow shape that is open to the rear so that the gear box 40 can enter the installation space 4 from the outside of the rear portion 3 of the hull 1. The inner surface of the installation space 4 can be machined into a shape corresponding to the outer shape of the gear box 40. [

A driving source 5 (a diesel engine, a motor, a turbine or the like) installed inside the hull 1 is installed in the inside of the hull 1 and an intermediate shaft 6 is connected to the driving source 5. A propeller shaft 7 to which the rear propeller 20 is fixed is connected to the intermediate shaft 6. The tip of the propeller shaft 7 protruding forward of the gear box 40 is connected to the intermediate shaft 6, respectively. The intermediate shaft 6 is connected to the propeller shaft 7 so that the propeller shaft 7 can rotate together with the intermediate shaft 6.

The intermediate shaft 6 and the propeller shaft 7 can be connected to each other by means of a cylindrical coupling device 8 in a detachable and engageable manner. Here, an elastic coupling unit is shown as an example, but the connection method of the intermediate shaft 6 and the propeller shaft 7 is not limited thereto. A flange coupling system, a friction clutch system, a magnetic clutch system, a spline system, and the like can be selectively employed.

2, the reverse rotation device 30 includes a gear box 40 accommodated in an installation space of the rear end 3 of the hull 1, a forward propeller 10 installed in the gear box 40, The propeller shaft 7 includes a gear box 40 and a gear box 40. The gear box 40 includes a reversing gear unit that rotates in a direction opposite to the rotation of the propeller shaft 7, The propeller shaft < RTI ID = 0.0 >

A rear propeller 20 is fixed to a propeller shaft 7 extending to the rear of the gear box 40 and a front propeller 10 is rotatably supported on an outer surface between a rear propeller 20 and a gear box 40 do. The forward propeller 10 may be rotated in reverse to the rear propeller 20 when the propeller shaft 7 is rotated by being connected to the inversion device 30 as will be described in detail later.

The rear propeller 20 is fixed to the rear portion of the propeller shaft 7 so as to rotate together with the propeller shaft 7, as shown in Figs. The rear propeller 20 includes a hub 21 fixed to the propeller shaft 7 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 propeller shaft 7. [ The propeller shaft 7 is fastened to the rear end of the propeller shaft 7 so that the rear propeller 20 can be more firmly fixed to the propeller shaft 7 by fastening the fixed cap 24.

The rear portion 7a of the propeller shaft 7 may be provided in a tapered outer surface whose outer diameter is reduced toward the rear and the axial coupling hole 23 of the hub 21 is formed in the outer surface of the propeller shaft 7 And a tapered inner surface corresponding to the outer 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 front propeller 10 is rotatably installed on the outer surface of the propeller shaft 7 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 propeller shaft 7 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 propeller shaft 7 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).

The hub 11 of the front propeller 10 can be rotatably supported on the outer surface of the propeller shaft 7 by a roller bearing 13. The front end of the roller bearing 13 is supported by the step portion 14 formed on the rear side of the hub 11 to prevent the roller bearing 13 from being disengaged from the engagement position. A cylindrical journal bearing may be used together with the roller bearing 13 or instead of the roller bearing 13 by rotatably supporting the hub 11 of the front propeller 10. [

A second sealing device 100 to be described later is provided between the front propeller 10 and the rear propeller 20 in order to seal between the hub 11 of the front propeller 10 and the hub 21 of the rear propeller 20 The lubricating oil pressure of the second sealing device 100 and the lubricating oil pressure difference of the space between the propeller connecting member 33 and the propeller shaft 7 should be maintained. A sealing member 15 is provided between the hub 11 of the front side front propeller 10 of the roller bearing 13 and the propeller shaft 7 so that the oil supply The path can be separated.

As shown in Figs. 2 and 4, the gear box 40 of the reverse rotation device 30 has a space for accommodating a reverse gear unit, which will be described later, in combination with a cylindrical front frame 41 and a front frame 41 And includes a cylindrical rear frame 42 formed therein.

The front frame 41 and the rear frame 42 are formed in such a manner that an opening is formed in the axial direction so that the shaft connecting member 31 and the propeller connecting member 33 to be described later can extend inward and outward.

Although the front frame 41 and the rear frame 42 may be integrally formed, they may be provided in an assembled form, if necessary, of two or more.

The front frame 41 and the rear frame 42 can be assembled in a structure for preventing the lubricant for lubricating the reverse gear unit provided therein from leaking to the outside.

The reverse gear unit inside the gear box 40 is connected to a cylindrical shaft connecting member 31 coupled to the propeller shaft 7 to be provided with a driving force of the propeller shaft 7, A plurality of first planetary gears 44 engaging with the first ring gear 43 and a plurality of first planetary gears 44 engaged with the first planetary gears 44, A plurality of second planetary gears 46 and a plurality of second planetary gears 46 that are held in engagement with the other side of the sun gear unit 45, And a second ring gear 47 that engages with the second planetary gear 46 and is fixed to the inner surface of the gear box 40. The second ring gear 47 meshes with the second planetary gear 46,

The first planetary gear 44 meshes with the first ring gear 43 and transmits the driving force of the first ring gear 43 to the sun gear unit 45. The first planetary gear 44 meshes with the fixed position And is rotatably coupled to the first carrier 48 such that it is only rotatable.

The first carrier 48 includes a first planetary gear shaft support portion 48a for rotatably supporting both ends of the plurality of first planetary gear shafts 44a and a propeller shaft 7 for supporting the propeller shaft 7. [ And a propeller shaft support portion 48b extending forwardly in a cylindrical shape accommodating the propeller shaft support portion 48b.

The first planetary gear 44 is rotatably fixed to the first carrier 48 by the first planetary gear shaft support portion 48a.

Accordingly, the plurality of first planetary gears 44 engaged with the first ring gear 43 rotate in a state supported by the fixed first planetary gear shaft support portion 41a.

A journal bearing 48c is provided between the propeller shaft support portion 48b of the first carrier 48 and the propeller shaft 7 and can be maintained in a fixed state regardless of the rotation of the propeller shaft 7. [

The first carrier 48 in which the first planetary gear 44 is assembled is accommodated in a cylindrical front frame 41 and is then coupled to the front frame 41 by a fastening means such as a bolt or the like.

The sun gear unit 45 includes a first sun gear 45a meshing with the plurality of first planetary gears 44 and a second sun gear 45b meshing with the plurality of second planetary gears 46 Respectively.

The first sun gear 45a meshing with the plurality of first planetary gears 44 rotates in accordance with the rotation of the plurality of first planetary gears 44 and the second sun gear 45a meshed with the second sun gear 45a The sun gear 45b rotates in accordance with the rotation of the first sun gear 45a to transmit the rotational force to the plurality of second planetary gears 46. [

A second ring gear 47 is fixed to the inner surface of the gear box 40 and a plurality of second planetary gears 46 are provided on the outer side of the plurality of second planetary gears 46, Respectively. The second carrier 49 is connected to the propeller connecting member 33 to transmit the driving force of the second planetary gear 46 to the forward propeller 10.

The second ring gear 47 may be integrally formed on the inner surface of the rear frame 42. The second ring gear 47 may be separately fabricated to facilitate machining of the gear teeth, Lt; / RTI >

The first planetary gear 44 and the first planetary gear shaft 41a and between the inner surface of the gear box 40 and the first ring gear 43 and between the second planetary gear 46 and the second ring gear 43, A bearing (not shown) may be provided between the second carrier 49 and the like for smooth rotation of the first ring gear 43 and the first and second planetary gears 44 and 46, respectively.

The shaft connecting member 31 connecting the propeller shaft 7 and the first ring gear 43 is provided in the shape of a cylinder and extends in the radial direction outer side of the propeller shaft 7 in such a manner as to penetrate the opening of the front frame 41 Respectively. The rear end of the shaft connecting member 31 is connected to the first ring gear 43 by spline or bolt fastening and the front end of the shaft connecting member 31 is connected to the propeller shaft 7 by a power connecting device 35 to be described later. A bearing 31a is provided between the inner surface of the shaft connecting member 31 and the outer surface of the propeller shaft supporting portion 48b of the first carrier 48 so that the shaft connecting member 31 rotates about the propeller shaft supporting portion 48b . A journal bearing 48c is provided between the inner surface of the propeller shaft support and the outer surface of the propeller shaft 7 to support the propeller shaft 7 in a state in which the first carrier 48 is fixed.

2 and 6, the power coupling device 35 for connecting the propeller shaft 7 and the shaft connecting member 31 includes a drive flange (not shown) provided on the propeller shaft 7 in front of the gear box 40 A driven flange 35b provided on the shaft connecting member 31 so as to face the drive flange 35a and a plurality of connecting bolts 35c fastened in the form of passing through them.

The propeller connecting member 33 connecting the inverting rotating device 30 and the front propeller 10 has a cylindrical shape and has a connecting portion 33a whose front end is coupled to the second carrier 49, And a connecting flange 33b which is coupled to the rear end by bolt tightening and is coupled to the hub 11 of the front propeller 10. The connecting flange 33b can be fixed to the front surface of the hub 11 of the front propeller 10 by a plurality of bolts.

A casing 50 which is coupled to the rear end 3 of the hull 1 so as to surround the propeller connecting member 33 and which extends in the rear direction of the hull 1 and forms an outer surface of the hull 1, Between the casing 50 and the front propeller hub 11, there is provided a thrust support device 60 for supporting the thrust of the front propeller 10, as shown in Figs. 2, 4 and 5.

The casing 50 is provided in a cylindrical shape having a hollow portion 51 through which the center of the casing 50 penetrates in the axial direction and has a smaller diameter toward the rear of the hull 1 so that the streamlined linear shape of the hull rear 3 is continuously maintained Can be provided.

A propeller connecting member 33 is rotatably inserted into the hollow portion 51 of the casing 50. The outer circumferential surface of the casing 50 extends from the rear end 3 of the hull 1 and is in direct contact with seawater, (3) of the hull (1) so as to guide the flow to the side of the front propeller (10).

At this time, in a portion connected to the outer peripheral surface 53 of the casing 50 from the rear 3 of the hull 1, the streamlined linear shape of the rear 3 of the hull 1 and the outer peripheral surface of the casing 50 have a substantially corresponding curvature so as to eliminate steps and to prevent the propulsion performance of the ship from deteriorating due to the water current flowing to the front propeller 10 side.

The distance between the rear end of the hull 1 and the front propeller 10 can be relatively increased by connecting a separate casing 50 to the rear end 3 of the hull 1 at the rear side of the gear box 40 The hub diameter of the front propeller 10 can be reduced regardless of the linearity.

If the diameter of the hub 11 of the front propeller 10 is reduced, the size of the front propeller blades 12, which can be used for propelling the ship, can be increased when the size of the front propeller 10 is the same, The propulsion performance can be improved.

The portion of the outer peripheral surface 53 of the casing 50 which is connected to the outer peripheral surface 53 of the casing 50 from the rear portion 3 of the hull 1 has a larger diameter than the streamlined linear shape of the rear portion 3 of the hull 1, The diameter may be further inclined. In this case, the diameter of the hub 11 of the front propeller 10 can be made smaller, and the optimum inclination of the casing 50 can be obtained by comparing the propulsion performance due to the decrease in the hub diameter, rather than the deterioration of the propulsion performance from the linear shape.

The casing 50 may be directly coupled to the rear hull 3, but in the present embodiment, the casing 50 is bolted to the rear surface of the rear frame 42 of the gear box 40 as an example.

A journal bearing 55 for supporting a vertical load acting on the propeller connecting member 33 is provided between the outer surface of the propeller connecting member 33 and the inner surface of the casing 50 so that the propeller connecting member 33 is fitted to the casing 50 ) Relative to each other.

The thrust supporting apparatus 60 includes a housing 61 detachably coupled to a rear portion of the casing 50 and having a receiving portion 61a formed therein and a cylindrical ring portion 63a provided on the outer surface of the propeller connecting member 33, A thrust pad 63 fixed to the receiving portion 61a and projecting in a radial direction from the ring portion 63a is received in the receiving portion 61a and a thrust pad 63 provided in the receiving portion 61a and supporting both surfaces of the thrust pad 63 And a second thrust bearing (65).

The first and second thrust bearings 64 and 65 in the thrust support apparatus 60 can support the forward and backward thrust loads transmitted from the front propeller 10 through the propeller connecting member 33. [ Specifically, the first thrust bearing 64 suffers a thrust load acting on the forward side from the forward propeller 10 when the ship is advanced, and the second thrust bearing 65 supports the forward thrust bearing 10 from the forward propeller 10 on the backward side of the ship It is possible to cope with the acting thrust load.

The thrust supporting device 60 can support the thrust of the front propeller 10, thereby simplifying the installation structure of the front propeller 10. 2, a roller bearing 13 is installed on the rear side of the front propeller 10 between the hub 11 of the front propeller 10 and the outer surface of the propeller shaft 7, Can be implemented.

Since the thrust support apparatus 60 is provided behind the casing 50, the casing 50 and the thrust support apparatus 60 are arranged between the rear propeller 10 of the hull 1 and the front propeller 10 in the longitudinal direction So that the distance between the rear part 3 of the hull 1 and the forward propeller hub 11 can be increased. Therefore, the linear diameter of the front propeller 10 and the diameter of the front propeller hub 11 can be relatively reduced, and the propulsion performance of the ship can be improved.

A first rope guard 70 is provided between the casing 50 and the front propeller 10 to maintain a linear shape between the outer surface of the casing 50 and the front propeller hub 11 and to prevent foreign substances such as ropes from being introduced into the casing 50, A second rope guard 71 for retaining a linear shape between the casing 50 and the hull rear 3 and preventing foreign matter such as ropes from being introduced into the hull 3 and a rear rope guard 71 for preventing the front propeller hub 11 and the rear propeller hub 12, a third rope guard 72 is provided.

The first to third rope guards 70, 71, and 72 may be hollow tubes having a smaller diameter toward the rear. The first to third rope guards 70, 71, and 72 may be of a split type and may include a casing 50 and a front propeller 10 The first to third rope guards 70, 71 and 72 can be fastened and separated from each other.

The front end of the first rope guard 70 corresponds to the diameter of the rear end of the casing 50 and the rear end of the first rope guard 70 corresponds to the diameter of the forward propeller hub 11, So as to form a streamlined outer shape of the hull 1 between the casing 50 and the front propeller hub 11 so that the diameter becomes smaller.

Since the first rope guard 70 is detachably mounted outside the radius of the thrust support apparatus 60 so that only the first rope guard 70 is separated during maintenance and repair of the thrust support apparatus 60, The support device 60 can be accessed. At this time, the housing 61 of the thrust supporter 60 is disengaged from the casing 50 to separate the housing 61 of the thrust supporter 60 and the thrust pad 63 ) And the first and second thrust bearings (64, 65).

 Since the first to third rope guards 70, 71, and 72 are formed of a relatively thin metal, the first rope guard 70, which is long in the longitudinal direction, may be damaged by water pressure, A reinforcing member 80 is provided to reinforce the rope guard 70.

One side of the reinforcing member 80 is supported on the upper portion of the housing 61 of the thrust supporting device 60 and the other side is supported on the back side of the first rope guard 70 so that the first rope guard 70, The reinforcing member 80 can prevent the first rope guard 70 from being damaged.

The reinforcing member 80 includes a first flange portion 81 formed on one side and in surface contact with the housing 61 and a second flange portion 82 formed on the other side and in surface contact with the inner surface of the first rope guard 70 ).

The first flange portion 81 may be rigidly coupled to the housing 61 in a bolt or other variety of ways and the second flange portion 82 may be welded or bolted to the first rope guard 70, The flange portion 82 and the first rope guard 70 can be mutually supported without separate coupling means. The second flange portion (82) can support the inner surface of the first rope guard (70) by surface contact to increase the supporting force.

The first rope guard 70 is fixed to the casing 50 and is installed in a slightly separated manner from the front propeller hub 11 or fixed to the front propeller hub 11 in a state slightly spaced from the rear hull 3 And can rotate together with the front propeller (10). The third rope guard 72 can be rotated together with the fixed side fixed to either the front propeller hub 11 or the rear propeller hub 21. [

The propulsion device according to the present embodiment is characterized in that the propeller shaft 7, the shaft connecting member 31, the reverse rotation device 30, the propeller connecting member 33, the casing 50, The gear box 40 of the reverse rotation device 30 can be inserted into the installation space 4 of the hull 1 by inserting it in a separate manufacturing factory.

The operation of the inversion rotating device 30 in the propulsion device according to the present embodiment can be performed as follows.

The rotation of the propeller shaft 7 is transmitted to the first ring gear 43 by the shaft connecting member 31. Therefore, the first ring gear 43 rotates in the same direction together with the propeller shaft 7. The rotation of the first ring gear 43 causes the first planetary gear 44 to rotate in the same direction as the first ring gear 43 and the first sun gear 45a Is rotated in the reverse direction by the rotation of the first planetary gears 44. The second sun gear 45b formed integrally with the first sun gear 45a is rotated reversely in the same direction as the first sun gear 45a and the second sun gear 45b meshing with the second sun gear 45b 2 planetary gear 46 rotates in the direction opposite to the rotation direction of the second sun gear 45b along the second ring gear 47 while the second ring gear 47 is fixed and at the same time revolves in the same direction do. The rotation of the second planetary gear 46 is transmitted to the propeller connecting member 33 by the second carrier 49 and the reverse rotation of the propeller connecting member 33 (rotation opposite to the propeller shaft) (10). Therefore, it is possible to realize the opposite rotation of the front propeller 10 and the rear propeller 20.

As shown in FIG. 2, the propulsion device of the present embodiment is constructed by sealing the space between the thrust supporter 60 and the hub 11 of the front propeller 10 to prevent seawater (or fresh water) A sealing device 90 and a second sealing device 100 for sealing between the hub 11 of the front propeller 10 and the hub 21 of the rear propeller 20 for the same purpose.

6, the first sealing device 90 includes a cylindrical first lining 91 provided on the connecting flange 33b of the propeller connecting member 33 fixed to the front of the front propeller hub 11, And a cylindrical first sealing member 92 which covers the outer surface of the first lining 91 so as to contact the outer surface of the first lining 91 and has one end fixed to the housing 61 of the thrust supporting device 60 .

The first lining 91 is fixed to the front propeller hub 11 by forming a flange portion 91a for fixing to the connecting flange 33b and fixing a plurality of fixing bolts 91b to the flange portion 91a .

The first sealing member 92 may be a system in which a plurality of semicircular rings 92a, 92b and 92c are stacked and fixed in the longitudinal direction of the propeller shaft 7 outside the first lining 91. The plurality of rings 92a, 92b, 92c may be joined together by bolting or welding.

The second sealing member 92 includes a plurality of packings 93a, 93b, 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. Each of the packings 93a, 93b, 93c is pressed toward the first lining 91 so as to be in close contact with each other, thereby preventing intrusion of seawater or foreign matter.

At this time, lubricating oil is supplied between the plurality of packings 93a, 93b, 93c, and the packing 93a, 93b, 93c is pressed toward the first lining 91 side by using the pressure of the lubricating oil to improve the sealing force .

The first lining 91 and the first sealing member 92 may be formed in semicircular shapes so as to be engaged after the installation of the front propeller 10.

7, the second sealing device 100 includes a cylindrical second lining 101 provided on the front surface of the rear propeller hub 21 and a second lining 101 contacting the outer surface of the second lining 101. [ And a cylindrical second sealing member 102 whose one end is fixed to the rear surface of the front propeller hub 11.

The second lining 101 is formed with a flange portion 101a for fixing to the rear propeller hub 21 and the flange portion 101a is fastened to the rear propeller hub 21 by fastening a plurality of fixing bolts 101b Can be fixed.

Similar to the first sealing member 92, the second sealing member 102 is also spaced apart from the inner surface facing the second lining 101, and a plurality of packings 103a, 103b , 103c. Each of the seals 103a, 103b and 103c is pushed toward the second lining 101 so as to interfere with each other, thereby preventing intrusion of seawater or foreign matter.

At this time, lubricating oil may be supplied between the plurality of packings 103a, 103b, 103c to pressurize the packings 103a, 103b, 103c toward the second lining 101 side by using the pressure of the lubricating oil to improve the sealing force .

The second lining 101 and the second sealing member 102 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.

Next, a method of installing the propulsion device according to the present embodiment in a hull is described.

4, when the propulsion device is installed, the gear box 40 and the reverse gear unit constituting the reverse rotation device 30 are assembled before being mounted on the hull 1, and the shaft connection member 31, The casing 50, and the thrust supporting device 60 are assembled to the outer surface of the propeller shaft 7. That is, the inverting rotating device 30 is attached to the propeller shaft 7 in advance before being mounted on the hull 1. Hereinafter, such a combined state is referred to as an assembly.

Such an assembly can be assembled after being manufactured outside the hull 1, and can be assembled to the propeller shaft 7 in advance, thereby enabling precise manufacture and assembly. In addition, since the first sealing device 90, which can be mounted only after the front propeller 10 is installed, can be previously mounted on the inversion rotating device 30 in the normal case, the operation of installing the propulsion device on the hull 1 It can be simplified.

The assembly including the propeller shaft 7 and the reverse rotation device 30 assembled at the manufacturing factory is 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 can do. In this case, a lifting device such as a crane capable of lifting the assembly can be used. The gear box 40 of the reverse rotation device 30 is slidably moved from the rear of the hull 1 to the installation space 4 of the rear hull 3 of the ship. And aligns the center of the propeller shaft 7 and the center of the intermediate shaft 6 to coincide.

The rear portion of the gear box 40 is connected to the outer peripheral portion of the installation space 4 after the reverse rotation device 30 enters and aligns the installation space 4 of the rear hull 3, Thereby fixing the gear box 40 to the hull rear 3.

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.

After fixing the gearbox 40 to the rear hull 3, the intermediate shaft 6 and the propeller shaft 7 are connected to the power coupling device 35.

1 and 2, the propeller shaft 7 is provided with a front propeller 10, a rear propeller 20, and related components (not shown) The installation of the propulsion device can be completed by mounting the first sealing device 90, the second sealing device 100 reinforcement member 80 and the first to third rope guards 70, 71, have.

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

When the propeller shaft 7 is rotated by the operation of the internal drive source 5 of the hull 1, the propeller 20 is rotated in the same direction as the propeller shaft 7, Rotate together. At the same time, the first ring gear 43 of the reverse rotation device 30 also rotates together with the propeller shaft 7 since it is connected to the propeller shaft 7 by the shaft connecting member 31. The rotation of the first ring gear 43 causes the first planetary gear 44 to rotate in the same direction as the rotation direction of the first ring gear 43 and to rotate in the same direction as the first sun gear 43, The gear 45a is rotated in the reverse direction (in the direction opposite to the propeller shaft) by the rotation of the first ring gear 43. [ The second sun gear 45b formed integrally with the first sun gear 45a is rotated reversely in the same direction as the first sun gear 45a and the second sun gear 45b meshing with the second sun gear 45b The second planetary gear 46 revolves in the same direction while rotating in the direction opposite to the rotation direction of the second sun gear 45b along the second ring gear 47 in a state in which the second ring gear 47 is fixed . The rotation of the second planetary gear 46 is transmitted to the propeller connecting member 33 by the second carrier 49 and the reverse rotation of the propeller connecting member 33 (rotation opposite to the propeller shaft) (10). Therefore, it is possible to realize the opposite rotation of the front propeller 10 and 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 gear box 40 via the propeller connecting member 33 and the first thrust bearing 64 of the thrust supporting apparatus 60 and serves as a driving force of the hull 1. [ The rear propeller 20 is also subjected to a reaction force because it generates propelling water rearward when it is advanced, and this force is transmitted to the propeller shaft 7 which is directly connected to the rear propeller 20 and acts as driving force.

The propulsion force of the front propeller 10 is transmitted to the gear box 40 through the propeller connecting member 33 and the second thrust bearing 65 of the thrust supporting apparatus 60, Is transmitted to the propeller shaft (7) which is directly connected.

Propulsion transmitted from the rear propeller 20 to the propeller shaft 7 is transmitted to the hull 1 through a thrust bearing or the like provided at a fixed portion at the rear end of the internal drive source 5 so that propulsion of the hull 1 is carried out.

Next, a propulsion device for a ship according to another embodiment of the present invention will be described.

The propulsion device according to another embodiment is different from the propulsion device according to the embodiment in that the configuration of the casing 50 coupled to the rear end 3 of the hull is eliminated and only some configuration changes are made, It is the same as example propulsion unit.

Hereinafter, different configurations of the propulsion device according to the embodiment will be mainly described, and the same components as those of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

8, the propulsion device according to another embodiment is configured such that the rear frame 42 'of the gear box 40' is accommodated in the installation space 4 in a state in which it is integrally formed with the casing 50 of the embodiment, And is coupled to the hull rear 3.

The outer surface of the gear box 40 ', that is, the outer surface of the front frame 41 and the rear frame 42' is supported by the inner surface of the installation space 4 to enable the rigid support of the gear box 40 ' .

A journal bearing 55 for supporting a vertical load acting on the propeller connecting member 33 is provided between the inner peripheral surface of the rear frame 42 'and the propeller connecting member 33 so that the propeller connecting member 33 is connected to the rear frame 42 '.

The thrust supporting device 60 is coupled to the rear of the rear frame 42 ', and the structure of the thrust supporting device 60 may be the same as that of the first embodiment.

 A fourth rope guard 75 is provided between the rear hull 3 and the front propeller 10 to maintain a linear shape between the rear hull 3 and the front propeller hub 11 and to prevent foreign substances such as ropes from entering the interior. And at least one reinforcing member 110 for supporting the fourth rope guard 75 in the outboard direction of the hull 1 is provided.

The fourth rope guard 75 has a front end corresponding to the diameter of the rear hull 3 and a rear end corresponding to the diameter of the front propeller hub 11 and having a smaller diameter toward the rear so as to maintain the streamlined linear shape of the hull 1 .

The front end of the fourth rope guard 75 may be fixed to the rim of the hull 3 and the rear end may be provided adjacent to the rim of the front propeller hub 11 in a range not obstructing the rotation of the front propeller 10 .

The fourth rope guard 75 is also provided in a split type so that the fourth rope guard 75 can be fastened and separated in a state in which the front propeller 10 is mounted.

The reinforcing member 110 includes a first reinforcing member 111 having one side supported on the housing 61 of the thrust supporting apparatus 60 and the other side supported on the rear surface of the fourth rope guard 75, And a second reinforcing member 113 supported on the outer circumferential surface 42'a of the rear frame 42 'protruding from the first rope guard 4 and the other of which is supported on the front side rear surface of the fourth rope guard 75. [

Each of the reinforcing members 110 has first and second flange portions 111a and 111b 113a and 113b formed on both sides thereof to connect the inner surface of the fourth rope guard 75, the housing 61 and the rear frame 42 ' To the outer circumferential surface 42'a of the outer circumferential surface 42'a.

The first flange portions 111a and 113a may be tightly coupled to the outer circumferential surface 42'a of the housing 61 and the rear frame 42'by bolts or other various means and the second flange portions 111b and 113b May be welded or bolted to the fourth rope guard 75 or the second flange portions 111b and 113b and the fourth rope guard 75 may be mutually supported without separate coupling means.

The thrust support apparatus 60 is also connected to the rear side of the rear frame 42 'projecting rearwardly of the hull 1 from the rear hull 3 so that the rear hull 3 and the front propeller hub 11 The linear gradient from the rear hull 3 to the front propeller hub 11 can be made gentle using the fourth rope guard 75 so that the flow of the flow of water can be improved, The diameter of the front propeller hub 11 can be reduced to increase the efficiency of the propulsion device.

1: hull, 3: hull,
4: installation space, 5: driving source,
6: intermediate shaft, 7: propeller shaft,
8: coupling device, 10: forward propeller,
20: rear propeller, 30: reverse rotation device,
31: shaft connecting member, 33: propeller connecting member,
40: gear box, 41: front frame,
42: rear frame, 43: first ring gear,
44: first planetary gear, 45: sun gear unit,
46: second planetary gear, 47: second ring gear,
48: first carrier, 49: second carrier,
50: casing, 53: outer peripheral surface of the casing,
60: thrust supporting device, 61: housing,
63 thrust pad 64 first thrust bearing,
65: second thrust bearing, 70: first rope guard,
71: second rope guard, 80: reinforcing member,
81: first flange portion, 82: second flange portion,
90: first sealing device, 100: second sealing device.

Claims (13)

A rear propeller fixed to the propeller shaft,
A front propeller rotatably supported on the propeller shaft in front of the rear propeller,
A reverse rotation device for inverting the rotation of the propeller shaft and transmitting the rotation to the front propeller,
A thrust supporting device provided at the rear of the inversion device to support the thrust of the forward propeller so as to protrude from the rear of the hull,
A rope guard provided between a rear end of the hull and a hub of the front propeller,
And at least one reinforcing member for supporting the rope guard in the outboard direction of the hull. The method according to claim 1,
Wherein the rope guard has a front end corresponding to a diameter of the rear of the hull and a rear end corresponding to a diameter of the hub of the front propeller and a diameter smaller toward the rear so as to maintain a streamline linear shape of the hull. 3. The method of claim 2,
Wherein a front end of the rope guard is fixed to a rear edge of the hull and a rear portion of the rope guard is installed adjacent to a hub edge of the front propeller. The method according to claim 1,
The reverse rotation device includes a reverse gear unit for reversing the rotation of the propeller shaft, and a gear box, which houses the reverse gear unit and has an outer surface corresponding to the inner surface shape of the installation space, Propulsion system for ships. 5. The method of claim 4,
Wherein the reinforcing member has one end supporting the inner surface of the rope guard and the other end being supported by at least one of a housing of the thrust support apparatus and an outer surface of the gear box. 6. The method of claim 5,
Wherein the reinforcing member includes a first flange portion in surface contact with the housing and a second flange portion in surface contact with at least one of an inner surface of the rope guard and an outer surface of the gear box. The method according to claim 1,
And a casing coupled to the rear of the hull so as to surround the rear surface of the inverting and rotating unit and extending to the rear of the hull to form an outer surface of the hull,
Wherein the thrust support apparatus is detachably coupled to the rear of the casing. 8. The method of claim 7,
Wherein the rope guard is fixed at one end to the casing and the other end is installed adjacent to the front propeller hub. The method according to claim 1,
Wherein the reinforcing member includes a first reinforcing member and a second reinforcing member that are divided on both sides. A rear propeller fixed to the propeller shaft,
A front propeller rotatably supported on the propeller shaft in front of the rear propeller,
An inverting rotating device for inverting the rotation of the propeller shaft and transmitting the inverted propeller shaft to the forward propeller,
A thrust supporting device provided at the rear of the inversion device to support the thrust of the forward propeller so as to protrude from the rear of the hull,
A sealing device for sealing between the thrust support device and the front propeller hub,
And a rope guard which is provided between a rear end of the hull and a hub of the front propeller so as to surround the thrust supporting device and the sealing device and whose diameter decreases toward the rear so as to maintain the streamlined linear shape of the hull. A rear propeller fixed to the propeller shaft,
A front propeller rotatably supported on the propeller shaft in front of the rear propeller,
And a gear box having a reversing gear unit for reversing the rotation of the propeller shaft to implement the inversion of the forward propeller,
An installation space formed at the rear of the hull so as to open in a rear direction of the hull to form an area where the reverse rotation device can be installed from the outside of the hull,
A thrust supporting device provided at the rear of the inversion device to support the thrust of the forward propeller so as to protrude from the rear of the hull,
And a rope guard which is provided between a rear end of the hull and a hub of the front propeller so as to surround the thrust supporting device and whose diameter decreases toward the rear so as to maintain a streamlined linear shape of the hull. 12. The method of claim 11,
The rear propeller further comprising at least one reinforcement member for supporting the rope guard in the outboard direction of the hull. 13. The method of claim 12,
Wherein the reinforcing member has one end supporting the inner surface of the rope guard and the other end being supported by at least one of a housing of the thrust support apparatus and an outer surface of the gear box.

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