KR20160116228A

KR20160116228A - Propulsion apparatus for ship

Info

Publication number: KR20160116228A
Application number: KR1020150043166A
Authority: KR
Inventors: 조만택; 최익흥; 원선일; 김연태
Original assignee: 현대중공업 주식회사
Priority date: 2015-03-27
Filing date: 2015-03-27
Publication date: 2016-10-07

Abstract

[0001] The present invention relates to a propulsion device for a ship, the propulsion device for a ship comprising: an inner shaft having a rear portion coupled to a rear propeller and a front portion tapered; An outer shaft to which the rear portion is coupled to the front propeller; An inversion rotating device coupled to the outer shaft of the rear portion and rotating the front propeller in a direction opposite to the rotating direction of the rear propeller; A drive shaft for transmitting power to the inner shaft or the outer shaft; And a coupling part for separating the power transmitted from the drive shaft to the inner shaft or the outer shaft using a flange connection.
In the propulsion device for marine vessel according to the present invention, since the front portion of the inner shaft and the rear portion of the drive shaft are coupled by using the inner shaft connecting portion, the front portion of the inner shaft is not required to be formed in a flange shape, It is possible to easily separate the inner joint from the inner shaft and to maintain the inner joint even if the damage is caused by the power pressure. In addition, if the inner joint is replaced only by replacing the inner joint, The cost can be reduced.
Further, in the propulsion device for marine vessel according to the present invention, the outer diameter of the inner shaft front portion is tapered to be reduced toward the front, and the inner diameter of the inner diameter shaft hollow tube of the inner shaft connection portion is tapered to be enlarged toward the rear, It is possible to adopt a forced-fit connection method, so that the coupling force between the inner shaft and the drive shaft can be increased.
The present invention also provides a propulsion device for a marine vessel, which comprises a coupling portion for separating a transmission path of power transmitted from a drive shaft to an inner shaft or an outer shaft, so that the power applied to the coupling portion between the drive shaft and the inner shaft, It is possible to prevent damage to the joint portion.

Description

[0001] Propulsion apparatus for ship [0002]

The present invention relates to a marine propulsion device.

The propeller is a device for propelling the ship by changing the power of the propulsion engine transmitted through the shaft system to thrust. Ship propellers include screw propellers, jet propellers, paddle cars, and void schneider propellers. Among them, helical propellers are the most popular because they have a relatively high propulsion efficiency, relatively simple structure, and relatively low production costs.

Spiral propellers can be classified by performance, with a fixed pitch propeller (FPP) fixed to a hub connected to a rotating shaft of the propeller wing, and a propeller wing can be moved in a hub connected to the rotary shaft, A controllable pitch propeller (CPP), a contra-rotating propeller that converts the rotational force exiting from the front propeller into a propelling force that is reversed by a rear propeller rotating in the opposite direction to the front propeller propeller (CRP).

In general, a propulsion device for a ship using a double inverting propeller includes an inner shaft connected to a power source inside the hull, a rear propeller coupled to a rear portion of the inner shaft, a hollow outer shaft provided to rotate on the outer surface of the inner shaft, And a front propeller coupled to the front propeller. At this time, a contra-rotating gear box can be used as a means for rotating the front propeller in the direction opposite to the rotation direction of the rear propeller.

Such a double inverted propeller has an excellent linearity, low vibration, low noise, and high propeller thrust due to a decrease in the heeling moment due to an increase in the torque balance induced by the propeller. Do. In addition, the dual inversion propeller can reduce the EEDI (Energy Efficiency Design Index), which can easily meet the EEDI requirements of the International Maritime Organization (IMO).

However, the double-inverted propeller has a complex structure in various points such as a bearing structure, a lubricating structure, a sealing structure, and the like, compared with a uniaxial propeller. And the maintenance is not easy. Therefore, there is a problem to be solved.

In recent years, research and development have been carried out to solve the above-mentioned problems and to enable the application of the double inverted propeller to the ship through the improvement of the reliability of the mechanical device, the minimization of the manufacturing maintenance cost and the improvement of the operating economical efficiency.

Generally, a propulsion device for a ship equipped with a double-inverted propeller is provided at the rear of a hull, in which the inner shaft and the outer shaft are concentrically arranged, the rear propeller is coupled to the rear portion of the inner shaft, A front propeller is coupled to the rear portion of the outer shaft, a reverse gear device and an elastic coupling are provided at the front portion of the outer shaft, the inner shaft is rotationally driven by the power source, As shown in Fig.

The joint portion between the inner shaft and the drive shaft requires a coupling force enough to withstand a strong power because the power is transmitted so that the ship can move.

However, in the propulsion device for a ship equipped with a conventional double-inverted propeller, there is a problem that it can not withstand the strong power transmitted to the joint portion and the inner shaft may be damaged.

In addition, conventionally, since the front portion of the inner shaft is formed into the flange shape, the inner shaft is not easily manufactured and installed, which raises the manufacturing cost and increases the installation cost.

Domestic Registration Bulletin 10-1255609 (2014.04.04) Japanese Patent Application Laid-Open No. 1995-052881 (Feb. 28, 1995)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a propulsion device for a ship capable of reducing the manufacturing cost of the inner shaft by eliminating the need to form the front portion of the inner shaft in a flange shape .

It is another object of the present invention to provide a motorcycle which is capable of easily maintaining the joint portion even if damage occurs at a portion joining the front portion of the inner shaft and the rear portion of the drive shaft, The present invention provides a propulsion device for a ship that can reduce the additional generation cost due to the replacement of the inner shaft.

It is also an object of the present invention to provide a propulsion device for a ship, which employs an interference fit method when coupling an inner shaft to a drive shaft, thereby increasing the coupling force between the inner shaft and the drive shaft.

It is also an object of the present invention to provide a propulsion device for a ship which can separate the transmission path of the power transmitted from the drive shaft to the inner shaft or the outer shaft and efficiently adjust the power applied to the coupling portion between the drive shaft and the inner shaft, .

In accordance with one aspect of the present invention, there is provided a propulsion device for a ship, comprising: an inner shaft having a rear portion coupled to a rear propeller and a front portion tapered; An outer shaft to which the rear portion is coupled to the front propeller; An inversion rotating device coupled to the outer shaft of the rear portion and rotating the front propeller in a direction opposite to the rotating direction of the rear propeller; A drive shaft for transmitting power to the inner shaft or the outer shaft; And a coupling part for separating the power transmitted from the drive shaft to the inner shaft or the outer shaft using a flange connection.

Specifically, the coupling portion may include: a driving shaft flange integrally formed on a rear portion of the driving shaft; An inner joint connecting the front portion of the inner shaft and the rear portion of the drive shaft; A nut which is fastened to the threaded portion of the inner shaft projected to the nut receiving groove; And an outer joint connecting the front portion of the reverse rotation device and the rear portion of the drive shaft.

Specifically, the inner shaft connecting portion includes an inner shaft hollow tube for inserting and fixing the front portion of the inner shaft; An inner shaft flange integrally formed with the inner hollow tube at a front portion of the inner hollow tube; And a nut receiving groove formed to be continuous with the hollow of the inner hollow tube and forming a central portion of the inner shaft flange, wherein the nut receiving groove is inserted and received.

Specifically, the outer shaft connecting portion includes: an outer shaft hollow tube in which all or a part of the inner shaft connecting portion including the inner shaft is accommodated; And an outer shaft flange integrally formed with the outer shaft hollow tube at a front portion of the outer shaft hollow tube.

Specifically, the drive shaft flange has a plurality of first drive shaft fastening holes formed therein; Wherein the inner hollow tube has an outer diameter equal to or larger than an outer diameter of the outer hollow tube of the outer shaft connection portion; Wherein the inner shaft flange has an outer diameter equal to an outer diameter of each of the drive shaft flange and the outer shaft flange and a plurality of first inner shaft fastening holes corresponding to the first drive shaft fastening holes are formed; Wherein the outer diameter hollow tube has an inner diameter equal to or larger than an outer diameter of the inner hollow tube and smaller than an outer diameter of the inner diameter flange; And the outer shaft flange may have a plurality of first outer shaft fastening holes each having an outer diameter equal to an outer diameter of each of the drive shaft flange and the inner shaft flange and corresponding to the first drive shaft fastening hole and the first inner fastening hole.

Specifically, the drive shaft flange includes a plurality of second drive shaft fastening holes and a plurality of third drive shaft fastening holes, Wherein the inner hollow tube has an outer diameter smaller than an outer diameter of the outer hollow tube of the outer axial connection portion; Wherein the inner shaft flange has an outer diameter smaller than an outer diameter of the drive shaft flange and smaller than an inner diameter of the outer shaft hollow tube of the outer shaft connection portion and a plurality of second inner shaft fastening holes corresponding to the second drive shaft fastening hole are formed; Wherein the outer diameter hollow tube has an inner diameter larger than the outer diameter of the inner hollow tube and larger than or equal to an outer diameter of the inner diameter flange; And the outer shaft flange has an outer diameter equal to the outer diameter of the drive shaft flange and larger than an outer diameter of the inner shaft flange, and a plurality of second outer shaft fastening holes corresponding to the third drive shaft fastening hole may be formed.

Specifically, the drive shaft flange has a plurality of fourth drive shaft fastening holes formed therein; Wherein the inner hollow tube has an outer diameter smaller than an outer diameter of the outer hollow tube of the outer axial connection portion; Wherein the inner shaft flange has an outer diameter equal to an outer diameter of the drive shaft flange and equal to an outer diameter of the outer shaft flange, a plurality of third inner shaft fastening holes corresponding to the fourth drive shaft fastening hole, and a plurality of fourth inner fastening holes; Wherein the outer diameter hollow tube has an inner diameter larger than an outer diameter of the inner hollow tube and smaller than an outer diameter of the inner diameter flange; And the outer shaft flange has an outer diameter that is larger than the outer diameter of the drive shaft flange and is equal to an outer diameter of the inner shaft flange, and a plurality of third outer shaft fastening holes corresponding to the fourth inner shaft fastening hole may be formed.

Specifically, a front end portion of the inner shaft is formed with a first tapered portion having a tapered shape whose outer diameter is reduced toward the front side, and the inner hollow tube has a first tapered portion having a tapered shape whose inner diameter increases toward the rear A corresponding second tapered portion can be formed.

In the propulsion device for marine vessel according to the present invention, since the front portion of the inner shaft and the rear portion of the drive shaft are coupled by using the inner shaft connecting portion, the front portion of the inner shaft is not required to be formed in a flange shape, It is possible to easily separate the inner joint from the inner shaft and to maintain the inner joint even if the damage is caused by the power pressure. In addition, if the inner joint is replaced only by replacing the inner joint, The cost can be reduced.

Further, in the propulsion device for marine vessel according to the present invention, the outer diameter of the inner shaft front portion is tapered to be reduced toward the front, and the inner diameter of the inner diameter shaft hollow tube of the inner shaft connection portion is tapered to be enlarged toward the rear, It is possible to adopt a forced-fit connection method, so that the coupling force between the inner shaft and the drive shaft can be increased.

The present invention also provides a propulsion device for a marine vessel, which comprises a coupling portion for separating a transmission path of power transmitted from a drive shaft to an inner shaft or an outer shaft, so that the power applied to the coupling portion between the drive shaft and the inner shaft, It is possible to prevent damage to the joint portion.

1 is a configuration diagram of a propulsion device for a ship according to an embodiment of the present invention.
FIG. 2 is an enlarged view for explaining a coupling structure between an inner / outer shaft and a drive shaft in a marine propulsion device according to an embodiment of the present invention.
3 is an enlarged view for explaining another embodiment of a coupling structure between the inner and outer shafts and the driving shaft according to the present invention.
4 is an enlarged view for explaining another embodiment of the coupling structure between the inner and outer shafts and the driving shaft according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements have the same numerical numbers as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

FIG. 1 is a configuration diagram of a propulsion device for a ship according to an embodiment of the present invention. FIG. 2 is an enlarged view for explaining a coupling structure between an inner and outer shafts and a drive shaft in a propulsion device for a ship according to an embodiment of the present invention, FIG. 3 is an enlarged view for explaining another embodiment of the coupling structure between the inner and outer shafts and the driving shaft according to the present invention, FIG. 4 is a perspective view showing another embodiment of the coupling structure between the inner and outer shafts and the driving shaft according to the present invention Fig.

1 to 4, a ship propulsion apparatus 1 according to an embodiment of the present invention includes a double inverted propeller 100, a shafting system 200, a reverse rotation device 300, a power source 400, And the coupling unit 500. The power generated by the power source 400 installed at the rear of the hull 2 is converted into rotational force in different directions in the shafting system 200 and the double reversing propeller 100 is rotated While generating thrust force. Here, the rear of the hull 2 refers to a portion protruding rearward from the hull 2 in a streamline manner, that is, a stern boss for supporting the shaftsystem 200 in which the double inverted propeller 100 is installed .

The double inverted propeller 100 may include a rear propeller 110 and a front propeller 120 and may include a rear propeller 120 rotating in a direction opposite to that of the front propeller 120, (110), and the torque balance is increased to decrease the heeling torque. Therefore, the linearity of the ship is excellent, the vibration is low, the noise is low, the propeller thrust is increased, great.

The rear propeller 110 is rotatably installed on an inner shaft 210 to be described later at a position spaced rearward from the front propeller 120 to be described later and fixed to the rear portion of the inner shaft 210 A rear propeller hub 112 and a plurality of blades 114 provided on an outer surface of the rear propeller hub 112. [ The rear propeller 110 can be coupled to the rear propeller hub 112 by an interference fit method in which the shaft coupling hole formed in the center of the rear propeller hub 112 is press-fitted into the outer surface of the rear portion of the inner shaft 210, The power generated by the power source 400 to be described later may be transmitted through the inner shaft 210 and be rotationally driven.

The front propeller 120 may be rotatably installed on an outer shaft 220 to be described later at a position spaced forward from the rear propeller 110. The front propeller 120 is fixed to the rear portion of the outer shaft 220, And a plurality of blades 124 provided on an outer surface of the front propeller hub 122. The front propeller hub 122 may include a front propeller hub 122, The front propeller 120 is coupled to the rear portion of the outer shaft 220 to be described later by a coupling means such as a flange to transmit the power generated by the power source 400 to be described later to the reverse rotation device 300 and the outer shaft 220, And can be rotationally driven in a direction opposite to that of the rear propeller 110.

The shafting system 200 may include an inner shaft 210 and an outer shaft 220 as an intermediate medium that receives power from a power source 400 to be described later and rotatably drives the double inverted propeller 100.

The inner shaft 210 may extend from the rear propeller 110 to the driving shaft 420 of the power source 400, which will be described later, as shown in FIG. The rear portion of the inner shaft 210 can be coupled to the rear propeller 110 in an interference fit manner and the front portion of the inner shaft 210 can be engaged with the rear portion of the drive shaft 420 .

The inner shaft 210 may be integrally formed from the rear propeller 110 to the driving shaft 420 of the power source 400. The inner shaft 210 may be divided into a plurality of pieces by first and second inner shafts . When the rear portion of the first inner shaft is engaged with the rear propeller 110 and the front portion of the second inner shaft is engaged with the drive shaft 420, the front portion of the first inner shaft and the rear portion of the second inner shaft are inserted into the inner To a sleeve coupling (not shown).

The front portion of the inner shaft 210 may be formed with a first tapered portion 210a having a tapered shape whose outer diameter is reduced toward the front so as to be coupled with the engaging portion 500 to be described later in an interference fit manner And a threaded portion 210b extending from the first tapered portion 210a by a predetermined length may be formed.

The first tapered portion 210a may be formed in a shape corresponding to the second tapered portion 521a formed in the inner shaft hollow tube 521 of the inner shaft connection portion 520 to be described later, So that it does not protrude to the outside of the inner joint connecting portion 520 when the interference fit is made.

The threaded portion 210b is formed so as to correspond to the nut 530 to be described later and is projected into the nut receiving groove 523 of the inner shaft connecting portion 520 to be described later when the first tapered portion 210a is forcedly inserted . The threaded portion 210b is fastened by a nut 530 to be described later so that the inner shaft 210 can be more firmly fixed to the inner shaft connecting portion 520 to be described later.

As described above, the first tapered portion 210a formed on the front portion of the inner shaft 210 and the second tapered portion 521a formed on the inner shaft hollow tube 521 of the inner shaft connection portion 520, which will be described later, The inner shaft flange 522 of the coupling part 500 and a drive shaft flange 510 to be described later may be coupled by a fixing member 550 to be described later in a flange connection manner.

As shown in FIG. 1, the outer shaft 220 is a hollow shape into which the inner shaft 210 can be inserted. The outer shaft 220 is a hollow shaft having a hollow shape, which transmits the power from the front propeller 120 to the outer shaft 220 To the inversion device 300. [ The rear portion of the outer shaft 220 can be coupled to the front propeller 120 and the front portion of the outer shaft 220 can be connected to the rear portion of a reverse rotation device 300 described later.

The outer shaft 220 may be integrally formed from the front propeller 120 to a reverse rotation device 300 to be described later. When the inner shaft 210 is composed of a plurality of the first and second inner shafts, 2 outer shafts surrounding the sleeve coupling portions connecting the inner shafts. Therefore, a plurality of the outer shafts may be separately manufactured by connecting the first and second outer shafts (not shown). When the rear portion of the first outer shaft is engaged with the front propeller 120 and the front portion of the second outer shaft is engaged with the reverse rotation device 300 to be described later, the front portion of the first outer shaft and the rear portion of the second outer shaft, Or by means of a < / RTI >

The reverse rotation device 300 is a device for rotating the front propeller 120 in the direction opposite to the rotation direction of the rear propeller 110 and may be mounted between the outer shaft 220 and a power source 400 to be described later.

Specifically, the reverse rotation device 300 may include a driving gear (not shown) that receives power from a power source 400, which will be described later, at a front portion thereof, A driven gear (not shown) may be provided.

The rear portion of the inverter 300 may be coupled to the front portion of the outer shaft 220 and the front portion of the inverter 300 may be coupled to the outer shaft 540 of the coupling portion 500, 420, respectively.

1, it may be located near the power source 400, but it may be located on the front side or the rear side of the aft bulkhead 3 depending on the configuration of the shaft system 200 have.

In the embodiment of the present invention, the reverse rotation device 300 is defined as a device for switching the rotation direction of the driving shaft to the opposite direction and transmitting the same to the driven shaft. In the embodiment of the present invention, the planetary gear type, A gear type, a bevel gear type, and the like, a detailed description of the inversion rotating device 300 applied to the present invention will be omitted.

The power source 400 may be installed inside the hull 2 to transmit power to the inner and outer shafts 210 and 220 of the shafting system 200 to generate the thrust of the double inverted propeller 100, An engine 410, and a drive shaft 420.

The main engine 410 may be an internal combustion engine, a steam engine, a gas turbine engine, or the like, which actively acts when propelling the boat.

The front portion of the drive shaft 420 is connected to the main engine 410 and the rear portion of the drive shaft 420 is connected to a coupling portion 500 to be described later so that the power of the main engine 410 can be transmitted to the inner and outer shafts 210 and 220. The drive shaft 420 can be stably supported by a support (not shown) fixed to the hull 2.

The drive shaft flange 510 may be integrally formed with the inner shaft flange 522 to be described later or the inner shaft flange 522 to be described later, The flange 542 and the fixing member 550 to be described later can be coupled in a flange connection manner.

The engaging portion 500 may be configured to transmit the power transmitted from the driving shaft 420 of the power source 400 to the inner shaft 210 or the outer shaft 220 of the shafting system 200 as shown in FIGS. 2, 3, And may be configured between the inner and outer shafts 210 and 220 and the driving shaft 420 so that the driving shaft flange 510, the inner shaft connecting portion 520, the nut 530, the outer shaft connecting portion 540, 550).

The drive shaft flange 510 may be integrally formed on the rear portion of the drive shaft 420 and may be integrally formed with the outer flange 542 of the inner shaft flange 522 of the inner shaft connecting portion 520 or an outer shaft connecting portion 540 And can be coupled in a flange connection manner by a fixing member 550 to be described later.

As shown in FIG. 2, the drive shaft flange 510 may be formed with a plurality of first drive shaft coupling holes 510a.

The first drive shaft fastening hole 510a may be formed so as to correspond to a first inner shaft fastening hole 522a and a first outer shaft fastening hole 522a to be described later so that the drive shaft flange 510 is fixed The inner shaft flange 522 and the outer shaft flange 542 to be described later can be bolted together by the member 550 to transmit power from the drive shaft 420 to the inner shaft 210. [

As shown in FIG. 3, the driving shaft flange 510 may include a plurality of second driving shaft fastening holes 510b and a plurality of third driving shaft fastening holes 510c.

The second drive shaft fastening hole 510b may be formed to correspond to a second inner shaft fastening hole 522b to be described later so that the drive shaft flange 510 is fixed to the inner shaft flange 522 So that power can be transmitted from the drive shaft 420 to the inner shaft 210.

The third drive shaft fastening hole 510c may be formed to correspond to a second outer shaft fastening hole 542b to be described later so that the drive shaft flange 510 is fixed to the outer shaft flange 542 So that power can be transmitted from the drive shaft 420 to the outer shaft 220.

As shown in FIG. 4, the drive shaft flange 510 may be formed with a plurality of fourth drive shaft fastening holes 510d.

The fourth drive shaft fastening hole 510d may be formed to correspond to a third internal shaft fastening hole 522c to be described later so that the drive shaft flange 510 is fixed to the inner shaft flange 522 So that power can be transmitted from the drive shaft 420 to the inner shaft 210.

The inner shaft connecting portion 520 includes an inner shaft hollow tube 521, an inner shaft flange 522 and a nut receiving groove 523 so as to engage the front portion of the inner shaft 210 and the rear portion of the drive shaft 420 .

The inner shaft hollow tube 521 may be configured to be inserted and fixed by inserting the front portion of the inner shaft 210 and may be constructed to adopt a forced fit coupling method to increase the coupling force.

Specifically, the inner hollow tube 521 may be formed in a cylindrical shape, and when the first tapered portion 210a is formed on the front portion of the inner shaft 210, the inner hollow tube 521 may have a tapered shape The second tapered portion 521a may be formed.

The second tapered portion 521a may be formed to correspond to the first tapered portion 210a formed in the front portion of the inner shaft 210. This allows the inner shaft 210 to be pressed against the inner hollow tube 521 The inner shaft 210 can be further press-fitted into the outer surface of the inner shaft 210 to fix the inner shaft 210 further.

A nut 530 to be described later is fastened to the threaded portion 210b of the inner shaft 210 protruding into the nut receiving groove 523 to be described later with the inner shaft 210 inserted into the inner hollow tube 521, The hollow tube 521 and the inner shaft 210 can be engaged and fixed.

2, the outer diameter of the inner hollow tube 521 may be equal to or greater than the outer diameter of the outer hollow tube 541 of the outer diameter connecting portion 540, which will be described later.

3 and 4, the outer diameter of the inner hollow tube 521 may be smaller than the outer diameter of the outer hollow tube 541 of the outer shaft connecting portion 540, which will be described later.

The inner shaft flange 522 is integrally formed with the inner shaft hollow tube 521 at the front portion of the inner shaft hollow tube 521 and may have a nut receiving groove 523 to be described later at a central portion thereof.

The inner shaft flange 522 can have an outer diameter equal to the outer diameter of each of the drive shaft flange 510 and the outer shaft flange 542 to be described later and has a drive shaft flange 510 and a later- A plurality of first inner shaft fastening holes 522a may be formed so that they can be coupled at the same time in a flange connection manner by the fastening member 542 and a fixing member 550 described later.

The first inner shaft fastening hole 522a may be formed so as to correspond to the first drive shaft fastening hole 510a and the first outer shaft fastening hole 542a to be described later so that the inner shaft flange 522 is fixed to the fixing member 550 can be bolted simultaneously with the drive shaft flange 510 and the outer shaft flange 542 to be described later so that power can be transmitted from the drive shaft 420 to the inner shaft 210 through the inner shaft connection portion 520.

3, the outer diameter of the inner shaft flange 522 may be smaller than the outer diameter of the drive shaft flange 510 and smaller than the inner diameter of the outer shaft hollow tube 541 of the outer shaft connecting portion 540 And a plurality of second inner shaft fastening holes 522b can be formed so as to be coupled by the flange connection method by the drive shaft flange 510 and a fixing member 550 to be described later.

The second inner shaft fastening hole 522b may be formed so as to correspond to the second drive shaft fastening hole 510b so that the inner shaft flange 522 is engaged with the drive shaft flange 510 by a fixing member 550, So that power can be transmitted from the drive shaft 420 to the inner shaft 210 through the inner shaft connecting portion 520.

4, the outer diameter of the inner shaft flange 522 may be larger than the outer diameter of the drive shaft flange 510 and may be equal to the outer diameter of the outer shaft flange 542, A plurality of third inner shaft fastening holes 522c and a plurality of fourth inner shaft fastening holes 522d are formed so as to be coupled by a flange connection method by an outer shaft flange 542 to be described later and a fixing member 550 to be described later .

The third inner shaft fastening hole 522c may be formed so as to correspond to the fourth drive shaft fastening hole 510d so that the inner shaft flange 522 is engaged with the drive shaft flange 510 by the fixing member 550, So that power can be transmitted from the drive shaft 420 to the inner shaft 210 through the inner shaft connecting portion 520.

The fourth inner shaft fastening hole 522d may be formed to correspond to a third outer shaft fastening hole 510c to be described later so that the inner shaft flange 522 is fixed to the outer shaft flange 542 So that the power transmitted from the drive shaft 420 to the inner shaft 210 through the inner shaft connecting portion 520 can be transmitted to the outer shaft connecting portion 540 to be described later.

The nut receiving groove 523 may be formed to be continuous with the hollow of the inner hollow tube 521 while forming a central portion of the inner shaft flange 522 and may have a space in which a nut 530 .

The nut 530 is fixed to the threaded portion 210b of the inner shaft 210 which is extended from the first tapered portion 210a of the inner shaft 210 to be described later and protruded to the nut receiving groove 523, Can be firmly fixed to the inner shaft hollow tube 521 of the inner shaft connecting portion 520. The nut 530 may be a rock nut or a hydraulic nut provided with a hydraulic piston capable of preventing the inner shaft connection portion 520 from being pushed out or pushed back to the front, have.

The outer shaft connecting portion 540 is connected to the front portion of the reverse rotation device 300 which is engaged with the front portion of the outer shaft 220 and the rear portion of the drive shaft 420, And may include an outer shaft hollow pipe 541 and an outer shaft flange 542 so as to engage the rear portion of the drive shaft 420.

The outer shaft hollow tube 541 may be configured such that all or a part of the inner shaft connection portion 520 including the inner shaft 210 can be received therein.

As shown in FIG. 2, the outer shaft hollow tube 541 may be configured such that a portion of the inner shaft connection portion 520 including the inner shaft 210 can be received therein. And may be smaller than the outer diameter of the inner shaft flange 522.

3, the outer shaft hollow tube 541 may be configured such that the entire inner shaft connection portion 520 including the inner shaft 210 can be received therein, And may be equal to or greater than the outer diameter of the inner shaft flange 522. [

4, a portion of the inner shaft connecting portion 520 including the inner shaft 210 may be received therein, and the inner diameter of the inner shaft connecting portion 520 may be defined by an inner shaft hollow tube 541, The outer diameter of the inner shaft flange 522 may be larger than the outer diameter of the inner shaft flange 522.

The outer shaft flange 542 may be integrally formed with the outer shaft hollow tube 541 in the front portion of the outer shaft hollow tube 541.

The outer diameter flange 542 may have an outer diameter equal to the outer diameter of each of the drive shaft flange 510 and the inner shaft flange 522 and may have a diameter equal to the outer diameter of the drive shaft flange 510 and the inner shaft flange 522 A plurality of first outer shaft fastening holes 542a may be formed so as to be coupled by a fixing member 550 to be described later by a flange connection method.

The first outer shaft fastening hole 542a may be formed to correspond to the first driving shaft fastening hole 510a and the first inner fastening hole 522a so that the outer shaft flange 542 is fixed to the fixing member 550, Shaft flange 510 and the inner shaft flange 522 by means of the inner shaft connecting portion 520 and the outer shaft connecting portion 540 from the drive shaft 420 to the outer shaft 220 via the inversion rotating device 300, Lt; / RTI >

3, the outer diameter flange 542 may have an outer diameter equal to the outer diameter of the drive shaft flange 510 and larger than the outer diameter of the inner shaft flange 522. The outer diameter flange 542 may include a drive shaft flange 510, A plurality of second outer shaft fastening holes 542b may be formed so as to be coupled by the fixing member 550 in a flanged connection manner.

The second outer shaft fastening hole 542b may be formed to correspond to the third drive shaft fastening hole 510c so that the outer shaft flange 542 is engaged with the drive shaft flange 510 by the fixing member 550, So that power can be transmitted from the drive shaft 420 to the outer shaft 220 via the outer shaft connecting portion 540 and the inversion rotating device 300.

4, the outer diameter of the outer flange 542 may be larger than the outer diameter of the drive shaft flange 510 and may be the same as the outer diameter of the inner shaft flange 522. The outer diameter flange 522, A plurality of third outer shaft fastening holes 542c may be formed so as to be coupled in a flanged connection manner by the fixing member 550 to be fixed.

The third outer shaft fastening hole 542c may be formed to correspond to the fourth inner shaft fastening hole 522d so that the outer shaft flange 542 is engaged with the inner shaft flange 522 by a fixing member 550, So that the power can be transmitted from the drive shaft 420 to the outer shaft 220 through the inner shaft connecting portion 520, the outer shaft connecting portion 540 and the reverse rotation device 300.

The fixing member 550 can be configured to be capable of bolting engagement between the drive shaft flange 510, the inner flange 522, and the outer shaft flange 542. The fixing member 550 may be a bolt and a nut, or all members used in a flange coupling method may be used.

The power transmission path from the drive shaft 420 to the inner shaft 210 or the outer shaft 220 may be different depending on the coupling structure between the inner and outer shafts 210 and 220 and the drive shaft 420. [

1 and 2, the transmission path of the power transmitted from the drive shaft 420 to the inner shaft 210 is the drive shaft 420 → the drive shaft flange 510 / the inner shaft flange 522 → the inner shaft hollow tube 521 → And the inner shaft 210. The transmission path of the power transmitted from the drive shaft 420 to the outer shaft 220 is the drive shaft 420 → the drive shaft flange 510 / the inner shaft flange 522 / the outer shaft flange 542, An outer shaft hollow tube 541, an inversion rotating device 300, and an outer shaft 220 in this order.

1 and 3, a power transmission path from the drive shaft 420 to the inner shaft 210 is a drive shaft 420, a drive shaft flange 510, an inner shaft flange 522, an inner shaft hollow tube 521 And the inner shaft 210. The transmission path of the power transmitted from the drive shaft 420 to the outer shaft 220 is the drive shaft 420 → the drive shaft flange 510 / the outer shaft flange 542 → the outer shaft hollow tube (541) - > the inverter (300) - > the outer shaft (220).

1 and 4, a power transmission path from the drive shaft 420 to the inner shaft 210 is a drive shaft 420, a drive shaft flange 510, an inner shaft flange 522, an inner shaft hollow tube 521 And the inner shaft 210. The transmission path of the power transmitted from the drive shaft 420 to the outer shaft 220 is the drive shaft 420 → the drive shaft flange 510 / the inner shaft flange 522 → the inner shaft flange The outer shaft flange 542, the outer shaft hollow tube 541, the reverse rotation device 300, and the outer shaft 220 in this order.

The front portion of the inner shaft 210 and the rear portion of the drive shaft 420 are coupled to each other using the inner shaft connecting portion 520 so that the front portion of the inner shaft 210 does not need to be formed in a flange shape, It is possible to reduce the manufacturing cost of the coupling part 210 and to easily maintain the inner joint connection part 520 separated from the inner shaft 210 even if the coupling part is damaged by the power pressure, It is only necessary to replace the inner joint connection part 520, so that it is possible to reduce the additional generation cost due to the replacement of the inner joint shaft 210 as a whole.

In this embodiment, the outer diameter of the front portion of the inner shaft 210 is tapered to be reduced toward the front, and the inner diameter of the inner hollow tube 521 of the inner shaft connection portion 520 is tapered The coupling between the inner shaft 210 and the driving shaft 420 can be increased since the inner shaft 210 is coupled to the driving shaft 420 by the interference fit method.

In this embodiment, the coupling portion 500 is configured to separate the transmission path of the power transmitted from the driving shaft 420 to the inner shaft 210 or the outer shaft 220, so that the driving shaft 420 and the inner shaft 210, Or the driving force applied to the coupling portion between the driving shaft 420 and the outer shaft 220 can be efficiently controlled, and damage to the coupling portion can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: propulsion device for ships 2: hull
3: stern bulkhead 100: double inverted propeller
110: rear propeller 112: hub
114: wing 120: front propeller
122: hub 124: wing
200: shaft system 210: internal shaft
210a: first tapered portion 210b:
220: outer shaft 300: reverse rotation device
400: power source 410: main engine
420: drive shaft 500:
510: drive shaft flange 510a: first drive shaft fastening hole
510b: second driving shaft fastening hole 510c: third driving shaft fastening hole
510d: fourth drive shaft fastening hole 520: inner shaft connection portion
521: Inner hollow tube 521a: Second taper part
522: inner shaft flange 522a: first inner shaft fastening hole
522b: second inner shaft fastening hole 522c: third inner shaft fastening hole
522d: fourth inner shaft fastening hole 523: nut receiving groove
530: nut 540: outer shaft connection
541: outer hollow tube 542: outer shaft flange
542a: first outer shaft fastening hole 542b: second outer shaft fastening hole
542c: Third outer shaft fastening hole 550: Fixing member

Claims

An inner shaft having a rear portion coupled to the rear propeller and a front portion tapered;
An outer shaft to which the rear portion is coupled to the front propeller;
An inversion rotating device coupled to the outer shaft of the rear portion and rotating the front propeller in a direction opposite to the rotating direction of the rear propeller;
A drive shaft for transmitting power to the inner shaft or the outer shaft; And
And a coupling part for separating the power transmitted from the drive shaft to the inner shaft or the outer shaft using a flange connection.

The connector according to claim 1,
A drive shaft flange integrally formed on a rear portion of the drive shaft;
An inner joint connecting the front portion of the inner shaft and the rear portion of the drive shaft;
A nut which is fastened to the threaded portion of the inner shaft projected to the nut receiving groove; And
And an outer shaft connecting portion coupling the front portion of the inverting and rotating unit and the rear portion of the drive shaft.

3. The connector according to claim 2,
An inner shaft hollow tube for inserting and fixing the front portion of the inner shaft;
An inner shaft flange integrally formed with the inner hollow tube at a front portion of the inner hollow tube; And
And a nut receiving groove formed to be continuous with the hollow of the inner hollow tube and forming a central portion of the inner shaft flange, wherein the nut receiving groove is inserted and received.

[5] The apparatus of claim 3,
An outer shaft hollow tube in which all or a part of the inner shaft connection portion including the inner shaft is accommodated; And
And an outer shaft flange integrally formed with the outer shaft hollow tube at a front portion of the outer shaft hollow tube.

5. The method of claim 4,
The drive shaft flange has a plurality of first drive shaft fastening holes formed therein;
Wherein the inner hollow tube has an outer diameter equal to or larger than an outer diameter of the outer hollow tube of the outer shaft connection portion;
Wherein the inner shaft flange has an outer diameter equal to an outer diameter of each of the drive shaft flange and the outer shaft flange and a plurality of first inner shaft fastening holes corresponding to the first drive shaft fastening holes are formed;
Wherein the outer diameter hollow tube has an inner diameter equal to or larger than an outer diameter of the inner hollow tube and smaller than an outer diameter of the inner diameter flange; And
Wherein the outer shaft flange has an outer diameter equal to an outer diameter of each of the drive shaft flange and the inner shaft flange and a plurality of first outer shaft fastening holes corresponding to the first drive shaft fastening hole and the first inner fastening hole simultaneously are formed. Propulsion device.

5. The method of claim 4,
Wherein the drive shaft flange includes a plurality of second drive shaft fastening holes and a plurality of third drive shaft fastening holes;
Wherein the inner hollow tube has an outer diameter smaller than an outer diameter of the outer hollow tube of the outer axial connection portion;
Wherein the inner shaft flange has an outer diameter smaller than an outer diameter of the drive shaft flange and smaller than an inner diameter of the outer shaft hollow tube of the outer shaft connection portion and a plurality of second inner shaft fastening holes corresponding to the second drive shaft fastening hole are formed;
Wherein the outer diameter hollow tube has an inner diameter larger than the outer diameter of the inner hollow tube and larger than or equal to an outer diameter of the inner diameter flange; And
Wherein the outer shaft flange has an outer diameter equal to the outer diameter of the drive shaft flange and larger than an outer diameter of the inner shaft flange, and a plurality of second outer shaft fastening holes corresponding to the third drive shaft fastening hole are formed.

5. The method of claim 4,
Wherein the drive shaft flange is formed with a plurality of fourth drive shaft fastening holes;
Wherein the inner hollow tube has an outer diameter smaller than an outer diameter of the outer hollow tube of the outer axial connection portion;
Wherein the inner shaft flange has an outer diameter equal to an outer diameter of the drive shaft flange and equal to an outer diameter of the outer shaft flange, a plurality of third inner shaft fastening holes corresponding to the fourth drive shaft fastening hole, and a plurality of fourth inner fastening holes;
Wherein the outer diameter hollow tube has an inner diameter larger than an outer diameter of the inner hollow tube and smaller than an outer diameter of the inner diameter flange; And
Wherein the outer diameter flange has an outer diameter larger than an outer diameter of the drive shaft flange and equal to an outer diameter of the inner shaft flange and a plurality of third outer shaft fastening holes corresponding to the fourth inner shaft fastening hole are formed.

The method of claim 3,
A front end portion of the inner shaft is formed with a first tapered portion having a tapered shape whose outer diameter is reduced toward the front side,
Wherein the inner hollow tube is formed with a second tapered portion corresponding to the first tapered portion having a tapered shape whose inner diameter is enlarged toward the rear side.