KR20160116227A

KR20160116227A - Propulsion apparatus for ship

Info

Publication number: KR20160116227A
Application number: KR1020150043165A
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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine propulsion device, and more particularly, to a propulsion device for a marine vessel, which comprises a double inverted propeller composed of a rear propeller connected to an inner shaft and a front propeller connected to an outer shaft; A reverse rotation device including at least one gear and a housing covering the gear, the reverse rotation device inverting the rotation of the drive shaft to the front propeller and transmitting the rotation; And a thrust bearing portion which is provided between one surface of the gear and the inner surface of the housing and prevents the outer shaft from being pushed forward or backward with respect to the hull of the ship.
In the ship propulsion device according to the present invention, since the thrust bearing is installed in the inversion rotating device, it is not necessary to separately process the inner shaft or the outer shaft to install the thrust bearing between the outer shaft and the inner shaft, have.

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).

Generally, a marine propulsion device using a double-inverted propeller includes an inner shaft connected to a power source, a rear propeller coupled to a rear end of the inner shaft, a hollow outer shaft provided to rotate on the outer surface of the inner shaft, And a 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 mechanical reliability, the minimization of the production maintenance cost, and the improvement of the operating economical efficiency.

Korean Patent Registration No. 10-1255609 (Registered Date: 2013 04 04) Korean Patent Laid-Open No. 10-2012-0137680 (published on December 24, 2012) Korean Registered Patent No. 10-1313587 (registered on September 25, 2013)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide an internal bearing device having a double bearing structure in which an auxiliary bearing is provided between an inner shaft and a main bearing, So that abrasion of the inner shaft can be minimized by the auxiliary bearing.

It is another object of the present invention to provide a double bearing capable of stably installing a double bearing by forming a stepped portion in an outer shaft or a front propeller hub portion where a double bearing coupled with a main bearing and a secondary bearing is installed, And to provide a propulsion device for a ship capable of handling a thrust load acting on a front side or a rear side generated in a bearing.

It is another object of the present invention to provide a propulsion device for a ship capable of increasing the fixing force of a double bearing by providing a bearing fixing portion between the main bearing and the liner fixing portion of the inner shaft sealing portion in a double bearing structure in which the main bearing and the auxiliary bearing are combined. .

It is also an object of the present invention to provide a double bearing in which a main bearing and an auxiliary bearing are combined and a propulsion device for a ship which enables efficient lubrication around the bearing, by forming a lubricant supply line for allowing lubricant to pass through the bearing fixing portion .

It is also an object of the present invention to provide a thrust bearing for a ship which can reduce the manufacturing cost of the inner and outer shafts by eliminating the need for separately machining the inner shaft or outer shaft to provide a thrust bearing between the outer shaft and the inner shaft, Device.

In accordance with one aspect of the present invention, there is provided a propulsion device for a marine vessel, comprising: a double reversing propeller comprising a rear propeller connected to an inner shaft and a front propeller connected to an outer shaft; A reverse rotation device including at least one gear and a housing covering the gear, the reverse rotation device inverting the rotation of the drive shaft to the front propeller and transmitting the rotation; And a thrust bearing portion which is provided between one surface of the gear and the inner surface of the housing and prevents the outer shaft from being pushed forward or backward with respect to the hull of the ship.

Specifically, the reverse rotation device includes a driving gear connected to the driving shaft or the outer shaft; A driven gear connected to the outer shaft or the hub of the front propeller; And a reverse gear unit including at least one gear for transmitting the rotation of the drive gear to the driven gear and transmitting the rotation to the driven gear, wherein the thrust bearing unit includes at least one of the drive gear, the driven gear, And may be installed between the front end portion or the rear end portion and the housing.

Specifically, the thrust bearing portion may include a front thrust bearing installed between the front portion of the reverse rotation device and the housing to support a thrust load acting on the forward side from the double reverse propeller when the ship is advanced. And a rear thrust bearing installed between the rear portion of the inverting and rotating unit and the housing to support a thrust load acting on the stern from the double inverted propeller when the ship is reversed.

Specifically, the reversing gear unit includes: a first gear provided to engage with the driving gear; And a second gear installed between the first gear and the driven gear.

Specifically, the front thrust bearing may include a front thrust bearing disposed between a front end portion of the drive gear and the housing, between a front end portion of the driven gear and the housing, between a front end portion of the first gear and the housing, Or between the housing and the housing.

Specifically, the rear thrust bearing is disposed between the rear end of the drive gear and the housing, between the rear end of the driven gear and the housing, between the rear end of the first gear and the housing, Or between the housing and the housing.

Specifically, the housing may be fixed to the hull.

The propulsion device for marine vessel according to the present invention is characterized in that an inner bearing portion is provided so as to have a double bearing structure in which a main bearing and an auxiliary bearing are combined with an auxiliary bearing between an inner shaft and a main bearing, The abrasion of the shaft can be minimized, the replacement time of the main bearing, which is an expensive consumable item, can be prolonged, and the durability of the inner shaft can be improved.

In the propulsion device for marine vessel according to the present invention, since the stepped portion is formed on the outer shaft or the front propeller hub portion where the double bearing coupled with the main bearing and the auxiliary bearing are installed, the stepped portion can be a reference position for installing the double bearing, Not only can the installation work be facilitated but also it is possible to cope with the thrust load acting on the front side or the rear side generated in the double bearing due to the improvement of the fastening force of the double bearing and thereby prevent the double bearing from being separated or damaged by the thrust load .

Further, in the propulsion device for marine vessel according to the present invention, the bearing fixing portion is provided between the main bearing and the liner fixing portion of the inner shaft sealing portion in the double bearing structure in which the main bearing and the auxiliary bearing are combined, It is possible to cope with the stepped portion and the thrust load acting on the front side or the back side generated in the double bearing, thereby preventing the double bearing from being separated or damaged due to the thrust load.

Further, the propulsion device for marine vessel according to the present invention can enable effective lubrication of the double bearing combined with the main bearing and the auxiliary bearing by forming a lubricant supply line for allowing the lubricant to pass through the bearing fixing portion .

Further, in the propulsion device for marine vessel of the present invention, it is not necessary to separately process the inner shaft or the outer shaft to install the thrust bearing between the outer shaft and the inner shaft by installing the thrust bearing in the inverting rotary device, can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a marine propulsion device for explaining embodiments of the present invention. FIG.
2 is a view for explaining an inner shaft bearing of a propulsion device for a ship according to a first embodiment of the present invention.
3 is a view for explaining an inner-shaft bearing portion of a propulsion apparatus for a ship according to a second embodiment of the present invention.
4 is a view for explaining an inner bearing of a propulsion device for a ship according to a third embodiment of the present invention.
5 is a view for explaining an inner bearing of a propulsion device for a ship according to a fourth embodiment of the present invention.
6 is a view for explaining an inversion rotating apparatus of a propulsion apparatus for a ship according to a fifth embodiment of 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.

2 is a view for explaining an inner-shaft bearing portion of a propulsion device for a ship according to a first embodiment of the present invention, FIG. 3 is a view for explaining the present invention FIG. 4 is a view for explaining an inner bearing of a propulsion device for a ship according to a third embodiment of the present invention, and FIG. 5 is a view for explaining an inner bearing of a propulsion device for a ship according to a second embodiment of the present invention FIG. 6 is a view for explaining an inversion rotating device of a propulsion device for a ship according to a fifth embodiment of the present invention. FIG. 6 is a view for explaining an inner shaft bearing part of a propulsion device for a ship according to a fourth embodiment of the present invention.

1, a propulsion device 1 for a marine vessel for explaining the first to fifth embodiments of the present invention includes a double inverted propeller 100, an inner shaft 200, an outer shaft 300, an inner shaft seal portion 400 installed at the rear of the hull H of the ship and including a shaft seal portion 500, an inner shaft bearing portion 600, an outer shaft bearing portion 700, an inversion rotating device 800, (Not shown in the drawing) is converted into rotational force in different directions in the shaft system so that the double reversing propeller 100 rotates in opposite directions to generate propulsive force. Here, the term " rear " of the hull H means a portion protruding rearward from the hull H in a streamlined manner, that is, a stern boss on the stern side in order to support a shafting system in which the double reversing 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 induced by the propeller is increased to decrease the heeling moment of the ship, so that the straightness of the route is excellent, the vibration is low, the noise is low, And the efficiency is improved.

The rear propeller 110 is rotatably coupled to the inner shaft 200 to be described later at a position spaced rearward from the front propeller 120 to be described later and fixed to the rear end of the inner shaft 200 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 a force fitting connection method in which the shaft coupling hole formed at the center of the rear propeller hub 112 is press-fitted into the outer surface of the rear end portion of the inner shaft 200 to fix the inner shaft 200, And the generated power is transmitted through the inner shaft 200 and can be rotationally driven.

The front propeller 120 is rotatably coupled to an outer shaft 300 to be described later at a position spaced forward from the rear propeller 110. The front propeller 120 is fixed to the rear end of the outer shaft 300, 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 can be coupled to the rear end of the outer shaft 300 by a coupling means such as a flange and receives the power generated from the power source through the reverse rotation device 800 and the outer shaft 300, (Not shown).

The inner shaft 200 can extend from the rear propeller 110 to a drive shaft 900 to be described later and the hub 112 of the rear propeller 110 is coupled to the rear end and the drive shaft 900 is coupled to the front end , And the rear propeller (110).

The outer shaft 300 has a hollow shape into which the inner shaft 200 can be inserted and is capable of rotating the outer shaft 300 to transmit the power of the drive shaft 900 or the inner shaft 200 to be described later from the front propeller 120, The hub 122 of the front propeller 120 is coupled to the rear end of the device 800 and the reverse rotation device 800 is connected to the front end of the device 800 to transmit the driving force to the front propeller 120 .

The inner shaft 200 and the outer shaft 300 form a double soccer trough which the annular gap G is spaced apart by a predetermined distance and the gap G extends to the hollow portion of the front propeller hub 122 .

The inner shaft 200 spaced apart from the outer shaft 300 or the front propeller hub 122 by the gap G can be supported by an inner shaft bearing portion 600 which will be described later and provided on the gap G. [

Further, the outer shaft 300 can be supported by an outer shaft bearing portion 700, which will be described later, provided between the outer shaft 300 and the hull H.

The inner shaft seal 400 is provided on the inner shaft 200 connected to the rear propeller 110 and rotated in the reverse direction. The inner shaft seal 400 prevents seawater or foreign matter from flowing into the inner shaft 200 and the outer shaft 300 or prevents the lubricant from flowing into the gap G between the inner shaft 200 and the outer shaft 300 And may include a front inner shaft seal 410 and a rear inner shaft seal 420. [

The front end bearing seal 410 is adjacent to the front end of the outer shaft 300 on the inner shaft 200 and has at least one sealing space.

Specifically, the front end bearing seal 410 may be disposed on the inner shaft 200 exposed to the outside of the outer shaft 300, and may be fixed to the front end of the outer shaft 300 and provided with a seal liner A liner retaining portion 411 and a liner contacting portion 412 that is secured to the inner shaft 200 and contacts the lower end of the seal liner to implement a seal with the liner retaining portion 411.

The front end bearing seal 410 is filled with the sealing medium in the sealing space so that foreign matter or the like may flow into the gap G between the inner shaft 200 and the outer shaft 300 from the outside, It is possible to prevent leakage. At this time, since the front end bearing seal 410 is disposed inside the hull H, the foreign material that prevents the front end bearing seal 410 from being inflowed may be other foreign matter than seawater.

The rear end bearing seal 420 is provided on the rear end of the front propeller 120 on the inner shaft 200 and has at least one sealing space.

Specifically, the rear end bearing seal 420 is provided at a portion exposed from the outer shaft 300 at the rear of the inner shaft 200 and can be disposed between the front propeller 120 and the rear propeller 110, A liner fixing portion 421 fixed to the rear end of the sealing liner 122 and provided with a seal liner (not shown), a liner fixing portion 421 fixed to the inner shaft 200 and in contact with the lower end of the sealing liner, And a liner contact 422 that implements the liner contact 422.

Such a rear end bearing seal 420 is filled with a sealing medium in the sealing space so that foreign matter or the like may flow into the gap G between the inner shaft 200 and the outer shaft 300 from the outside, It is possible to prevent leakage. At this time, since the rear end bearing seal 420 is disposed outside the hull H, the material preventing the rear end bearing seal 420 from being inflowed may be seawater.

The outer shaft seal part 500 is provided between the outer shaft 300 connected to the front propeller 120 and rotated in the normal direction opposite to the rotating direction of the inner shaft 200 and the hull H, The outer shaft seal part 500 prevents seawater or foreign matter or the like from flowing between the outer shaft 300 and the hull H or allows the lubricating oil introduced into the lubrication space LS between the outer shaft 300 and the hull H to flow to the outside It can be provided to prevent the outflow. The outer shaft seal portion 500 may include a front outer shaft seal 510 and a rear outer shaft seal 520.

The front outer shoe seal (510) is provided on the outer shaft (300) behind the front inner shoe seal (410) and has at least one sealing space.

Specifically, the front outer shaft seal 510 includes a liner fixing portion 511 fixed to the inner surface of the hull H and provided with a seal liner (not shown), a lower fixing portion 511 fixed to the outer shaft 300, And a liner contact portion 512 that implements sealing with the liner retaining portion 511 in contact therewith.

Since the front outer shoe seal 510 is disposed inside the hull H in the same manner as the front inner shoe seal 410, the front outer shoe seal 510 can prevent the inflow of seawater,

The front outer shaft seal 510 has a sealing space communicated with the sealing space of the front inner shaft seal 410 and the sealing space of the rear inner shaft seal 420 so that the sealing medium is supplied from the outside to the front inner shaft seal 410, And can be distributed to the inner shaft seal 420. Accordingly, the front outer shaft seal 510 can distribute the sealing medium to the inner shaft sealing portion 400 and can be utilized as a sealing medium distribution box. Of course, the sealing space of the front outer sheath seal 510 also communicates with the sealing space of the rear outer sheath seal 520 to distribute the sealing medium.

The rear outer shaft seal 520 is provided on the front end of the front propeller 120 on the outer shaft 300 and has at least one sealing space.

Specifically, the rear outer shaft seal 520 includes a liner fixing portion 521 fixed to the outer surface of the hull H and provided with a seal liner (not shown), a lower fixing portion 521 fixed to the outer shaft 300, And a liner contact portion 522 that is in contact with the liner retaining portion 521 to provide sealing.

Since the rear outer shaft seal 520 is disposed on the outer side of the hull H in the same manner as the rear inner shaft 420, seawater or the like can be prevented from flowing between the hull H and the outer shaft 300.

The inner shaft bearing portion 600 is provided between the inner shaft 200 and the outer shaft 300 or between the inner shaft 200 and the inner shaft 200 so that the inner shaft 200 and the outer shaft 300 can be rotated in opposite directions, And the front propeller hub 122 and may be constituted by a front inner shaft bearing portion 610 and a rear inner shaft bearing portion 620. [ Since the inner shaft bearing portion 600 is subject to a large load during the operation of the propulsion device 1, a measuring device (not shown) capable of measuring the wear amount of the bearing itself, the temperature and pressure of the lubricating oil in the bearing portion, Can be installed.

The front end bearing shaft portion 610 may be provided on the gap G between the inner shaft 200 and the outer shaft 300 and may be configured to stably support the inner shaft 200 together with the rear bearing shaft portion 620 The outer shaft 300 can be moved to a position where the outer shaft 300 rotates.

The rear inner bearing portion 620 may be installed in the gap G between the inner shaft 200 and the front propeller hub 122 and may be located at the front propeller hub 122 provided at the rear end of the outer shaft 300 , The inner shaft 200 can be stably supported together with the front inner shaft bearing portion 610 located at the front portion of the outer shaft 300.

The gap G provided with the front inner bearing portion 610 and the rear inner bearing portion 620 is filled with lubricating oil. At this time, the lubricant can utilize a sealing medium. To this end, the sealing space of the inner and outer shaft sealing parts 400 and 500 is communicated with the gap G between the inner shaft 200 and the outer shaft 300 to transmit the sealing medium.

The front inner bearing portion 610 and the rear inner bearing portion 620 constituting the inner bearing bearing portion 600 may be variously configured including a double bearing structure in which a main bearing and an auxiliary bearing are coupled, 2 to 5 in detail.

The outer shaft bearing portion 700 may be provided in the lubricating space LS between the hull H and the outer shaft 300 and may be constituted by the front outer shaft bearing portion 710 and the rear outer shaft bearing portion 720 have.

The front outer sheath bearing 710 can be installed in the lubrication space LS between the hull H and the outer shaft 300 and can stably support the outer sheath 300 together with the rear outer sheath bearing 720, And can be positioned in front of the hull (H).

The rear outer sheath bearing portion 720 can be installed in the lubrication space LS between the hull H and the outer shaft 300 and is capable of stably supporting the outer sheath 300 together with the front outer sheath bearing portion 710 The rear end of the hull (H).

The lubricating oil supply part LT is connected to the lubricating space LS between the front outer shaft bearing part 710 and the rear outer shaft bearing part 720 so that the sealing medium which is lubricating oil can be transmitted to the front and rear outer shaft bearing parts 710 and 720 have.

The front end portion of the reverse rotation device 800 can be connected to the outer shaft 300 and the front end portion thereof can be connected to the drive shaft 900 to be described later. Thereby rotating the front propeller 120 in a direction opposite to the rotational direction of the rear propeller 110. [

1, it is shown that the embodiment of the present invention is installed in a space near the power source inside the hull H as shown in Fig. 1. However, according to the structure change of the shafting system, Of course, be installed in a space. In addition, the reverse rotation device 800 according to the embodiment of the present invention may be configured as a planetary gear type, a helical gear type, a bevel gear type, or the like.

The reverse rotation device 800 may include a thrust bearing so that the outer shaft 300 can prevent forward or backward sliding against the hull H, will be.

The drive shaft 900 may transmit power from a power source (not shown) to the inner shaft 200 and the outer shaft 300. The rear end of the drive shaft 900 may include a front end portion of the inner shaft 200, , And the front end may be connected to the power source. The drive shaft 900 can be stably supported by a support bearing (not shown) fixedly mounted on the hull H,

The power source may be installed inside the hull H and may be connected to the front end of the drive shaft 900 to generate the thrust of the double reversing propeller 100 through the inner and outer shafts 200, For example, an engine, a motor, a turbine, or the like.

Hereinafter, the front inner bearing portion 610 of the inner bearing portion 600 and the rear inner bearing portion 620 of the inner bearing portion 600 of the various configurations including the double bearing structure combining the main bearing and the auxiliary bearing, Will be described in detail with reference to Figs. 2 to 5. Fig.

2 is a view for explaining an inner shaft bearing of a propulsion device for a ship according to a first embodiment of the present invention. 2 (a) is a view for explaining the front inner shaft bearing portion 610 of the inner shaft bearing portion 600, and FIG. 2 (b) is a view for explaining the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 Fig.

2 (a) and 2 (b), the inner shaft bearing portion 600 has a double bearing structure in which auxiliary bearings 612 and 622 are coupled to the inner sides of the main bearings 611 and 621.

The main bearings 611 and 621 may be roller bearings, sliding bearings or hydrostatic bearings made of materials having relatively high abrasion strength as compared to the inner shaft 200 and the auxiliary bearings 612 and 622 may be made of a material having a relatively high abrasion strength, A sleeve bearing made of a relatively weak abrasion-resistant material, and the like. Therefore, wear of the main bearings 611 and 621 by the low-cost consumable auxiliary bearings 612 and 622, as well as wear of the inner shaft 200 The replacement time of the main bearings 611 and 621, which are expensive consumables, can be prolonged and the durability of the inner shaft 200 can be improved.

2 (a), the front inner shaft bearing portion 610 of the inner shaft bearing portion 600 may include a main bearing 611 and an auxiliary bearing 612. [

The main bearing 611 may be installed such that the outer side thereof is in contact with the inner peripheral surface of the outer shaft 300 and the inner side thereof may be coupled with the outer side of the auxiliary bearing 612 to be described later.

The auxiliary bearing 612 may be installed such that the outer side thereof is engaged with the inner side of the main bearing 611 and the inner side thereof may be provided to be in contact with the outer peripheral surface of the inner shaft 200.

The auxiliary bearing 612 may have a cross-sectional shape such that the area of contact with the main bearing 611 is wider than the area of contact with the inner shaft 200. The auxiliary bearing 612 may be tapered so as to easily engage with the inner shaft 200 and the main bearing 611. [

2B, the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 may include a main bearing 621 and an auxiliary bearing 622. In addition, as shown in FIG.

The main bearing 621 may be installed such that its outer side is in contact with the inner circumferential surface of the front propeller hub 122 and its inner side is coupled with the outside of the auxiliary bearing 622 which will be described later.

The auxiliary bearing 622 may be installed such that the outer side thereof is engaged with the inner side of the main bearing 621 and the inner side thereof may be provided to be in contact with the outer peripheral surface of the inner shaft 200.

The auxiliary bearing 622 may have a cross-sectional shape such that the area of contact with the main bearing 621 is wider than the area of contact with the inner shaft 200. The auxiliary bearing 622 may be tapered so as to be easily coupled between the inner shaft 200 and the main bearing 621. [

As described above, the front inner shaft bearing portion 610 and the rear inner shaft bearing portion 620 constituting the inner shaft bearing portion 600 of the first embodiment are similar in basic structure to each other, .

3 is a view for explaining an inner-shaft bearing portion of a propulsion apparatus for a ship according to a second embodiment of the present invention. 3 (a) is a view for explaining the front inner shaft bearing portion 610 of the inner shaft bearing portion 600, and FIG. 3 (b) is a view for explaining the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 Fig.

3 (a) and 3 (b), the inner shaft bearing portion 600 has a double bearing structure in which auxiliary bearings 612 and 622 are coupled to the inner sides of the main bearings 611 and 621 The same reference numerals are used as in the first embodiment, and the step portions 613 and 623 are provided at the portions where the double bearings are to be installed, which is different from the first embodiment. Therefore, in order to avoid duplication of the description, detailed description of each of the same components will be omitted. Only the steps 613 and 623, which are components different from the first embodiment of the present invention, .

3 (a), the front inner shaft bearing portion 610 of the inner shaft bearing portion 600 includes a main bearing 611, an auxiliary bearing 612, and a step portion 613 .

The stepped portion 613 may be formed at the front end of the outer shaft 300 as a position at which the double bearing coupled with the main bearing 611 and the auxiliary bearing 612 is installed.

Specifically, the stepped portion 613 may have a vertical plane that is a predetermined horizontal plane from the front end portion of the outer shaft 300 to the rear side and is bent at a right angle from the horizontal plane, whereby the outer axis of the portion where the step portion 613 is formed 300 are larger than the inner diameters of the other portions of the outer shaft 300.

The main bearing 611 is provided such that its outer side is in contact with the horizontal surface of the stepped portion 613 and one side of the main bearing 611 is in contact with the vertical surface of the stepped portion 613, May be installed to engage with the outside of the auxiliary bearing (612).

Since the auxiliary bearing 612 is the same as that described in the first embodiment, the explanation is omitted here.

3 (b), the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 includes a main bearing 621, an auxiliary bearing 622, a step portion 623 Lt; / RTI >

The stepped portion 623 may be formed at the rear end of the front propeller hub 122, which is a position where a double bearing coupled with the main bearing 621 and the auxiliary bearing 622 is installed.

More specifically, the stepped portion 623 may be formed of a vertical surface that has a predetermined horizontal length from the rear end of the front propeller hub 122 to a predetermined length and is bent at a right angle from the horizontal surface, The inner diameter of the front propeller hub 122 is larger than the inner diameter of the other portion of the front propeller hub 122. [

Since the step 623 is formed, the main bearing 621 is installed so that its outer side is in contact with the horizontal surface of the stepped portion 623, its one side is in contact with the vertical surface of the stepped portion 623, May be installed to engage with the outside of the auxiliary bearing (622).

Since the auxiliary bearing 622 is the same as that described in the first embodiment, the explanation is omitted here.

As described above, the front inner shaft bearing portion 610 and the rear inner shaft bearing portion 620 forming the inner shaft bearing portion 600 of the second embodiment are similar in basic structure to each other, .

4 is a view for explaining an inner bearing of a propulsion device for a ship according to a third embodiment of the present invention. 4 (a) is a view for explaining a front inner shaft bearing portion 610 of the inner shaft bearing portion 600, and FIG. 4 (b) is a view for explaining a rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 Fig.

As shown in FIGS. 4A and 4B, the inner shaft bearing portion 600 has a double bearing structure in which auxiliary bearings 612 and 622 are coupled to the inner sides of the main bearings 611 and 621 The same reference numerals are used for the same as those of the second embodiment in which the stepped portions 613 and 623 are provided and the main bearings 611 and 621 of the double bearings are fixed The bearing fixing portions 614 and 624 are further provided between the main bearings 611 and 621 and the inner shaft sealing portion 400 in order to achieve the same effects as those of the second embodiment. Therefore, in order to avoid duplication of the description, detailed description of each of the same components will be omitted, and only the bearing fixing portions 614 and 624, which are components different from the second embodiment of the present invention, I will explain.

4A, the front inner shaft bearing portion 610 of the inner shaft bearing portion 600 includes a main bearing 611, an auxiliary bearing 612, a step portion 613, a bearing fixing portion 612, 614).

The bearing fixing portion 614 can be installed between the main bearing 611 and the liner fixing portion 411 of the front inner shaft seal 410 and includes a body 614a, a fixing member 614b, a pressing member 614c, As shown in FIG.

The bearing fixing portion 614 can be fixed to the front end portion of the outer shaft 300 by the fixing member 614b and can be fixed to the front end portion of the outer shaft 300 by the pressing member 614c passing through the body 614a The main bearing 611 can be pressed against the vertical surface of the step portion 613 by pressing the main bearing 611.

Since the body 614a is difficult to be pressed by the pressing member 614c when the depth of the stepped portion 613 is deep and the distance from the main bearing 611 is large, And can have a cross-sectional shape of " a "

In this case, the fixing member 614b may be a bolt, and the body 614a may be fixed to the outer shaft 300 by a bolting method using bolts. When the body 614a is precisely machined such that a part of the body 614a is in contact with the main bearing 611, when the body 614a is fixed to the outer shaft 300 using the fixing member 614b, The main bearing 611 can be pressed.

The pressing member 614c may be provided so as to protrude from the body 614a to the main bearing 611 side in order to compensate for a case where a part of the body 614a is not precision machined so as to contact the main bearing 611 For example, a wrench screw. The pressing member 614c does not protrude toward the liner fixing portion 411 side of the front inner shaft seal 410. [

4 (b), the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 includes a main bearing 621, an auxiliary bearing 622, a step portion 623, A < / RTI >

The bearing fixing portion 624 can be installed between the main bearing 621 and the liner fixing portion 421 of the rear inner shaft seal 420 and includes a body 624a, a fixing member 624b, a pressing member 624c, As shown in FIG.

Specifically, the bearing fixing portion 624 can be fixed to the rear end portion of the front propeller hub 122 by the fixing member 624b and the pressing member 624c passing through the body 624a, The main bearing 621 can be tightly fixed to the vertical surface of the step portion 623 by pressing the main bearing 621 by means of the main bearing 621. [

Since the body 624a is difficult to be pressed by the pressing member 624c when the depth of the stepped portion 623 is deep and the distance from the main bearing 621 is large, And can have a cross-sectional shape of " a "

In this case, the fixing member 624b may be a bolt, and the body 624a may be fixed to the front propeller hub 122 by a bolting method using bolts. In this case, when the body 624a is precisely machined to contact the main bearing 621, the body 624a is fixed to the front propeller hub 122 using the fixing member 624b, The main bearing 621 can be pressed directly.

The pressing member 624c may be provided so as to protrude from the body 624a to the main bearing 621 side in order to compensate for a case where a part of the body 624a is not precisely machined to contact the main bearing 621 For example, a wrench screw. This pressing member 624c does not protrude toward the liner fixing portion 421 side of the rear front inner seal 420.

As described above, the front inner shaft bearing portion 610 and the rear inner shaft bearing portion 620 forming the inner shaft bearing portion 600 of the third embodiment are similar in basic structure to each other, .

5 is a view for explaining an inner bearing of a propulsion device for a ship according to a fourth embodiment of the present invention. 5 (a) is a view for explaining the front inner shaft bearing portion 610 of the inner shaft bearing portion 600 and FIG. 5 (b) is a view for explaining the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 Fig.

As shown in FIGS. 5A and 5B, the inner shaft bearing portion 600 has a double bearing structure in which auxiliary bearings 612 and 622 are coupled to the inner sides of the main bearings 611 and 621 The bearing fixing portions 614 and 624 are the same as the first embodiment, the second embodiment or the third embodiment, and are provided with the stepped portions 613 and 623 in the same manner as the second embodiment or the third embodiment. The same reference numerals are used as in the third embodiment and the same reference numerals are used to designate the double bearings in which the main bearings 611 and 621 and the auxiliary bearings 612 and 622 are coupled, The third embodiment differs from the third embodiment in that lubricant supply lines 615 and 625 are further provided so that lubricant can pass through the fixing portions 614 and 624. Accordingly, in order to avoid duplication of description, detailed description of each of the same components will be omitted, and only the components different from the third embodiment of the present invention, that is, the lubricant supply lines 615 and 625, I will explain.

5A, the front inner shaft bearing portion 610 of the inner shaft bearing portion 600 includes a main bearing 611, an auxiliary bearing 612, a step portion 613, a bearing fixing portion 612, 614), and a lubricating oil supply line (615).

The lubricating oil supply line 615 is provided with a body 614a of the bearing fixing portion 614 from the outside so as to smoothly supply the lubricating oil to the double bearing and the periphery of the double bearing combined with the main bearing 611 and the auxiliary bearing 612 And may be formed so as to be bent so as to avoid interference with the fixing member 614b and the pressing member 614c of the bearing fixing portion 614. At this time,

The lubricating oil supply line 615 may extend from the outside, which can supply lubricating oil, to the sealing space of the gap G provided with the double bearings or the front inner seal 410.

5 (b), the rear inner shaft bearing portion 620 of the inner shaft bearing portion 600 includes a main bearing 621, an auxiliary bearing 622, a step portion 623, A lubricating oil supply line 625, and a lubricating oil supply line 624.

The lubricating oil supply line 625 has a body 624a of the bearing fixing portion 624 from the outside so as to smoothly supply the lubricating oil to the double bearing and the periphery thereof coupled with the main bearing 621 and the auxiliary bearing 622 And may be formed to be bent so as to avoid interference with the fixing member 624b and the pressing member 624c of the bearing fixing portion 624. [

The lubricating oil supply line 625 may extend from the outside capable of supplying lubricating oil to the sealing space of the gap G provided with the double bearings or the rear inner seal 420.

As described above, the front inner shaft bearing portion 610 and the rear inner shaft bearing portion 620 constituting the inner shaft bearing portion 600 of the fourth embodiment are similar in basic structure to each other, .

Hereinafter, a reverse rotation device 800 including a thrust bearing will be described in detail with reference to FIG. 6 so that the outer shaft 300 can prevent forward or backward pivoting with respect to the hull H .

6 is a view for explaining an inversion rotating apparatus of a propulsion apparatus for a ship according to a fifth embodiment of the present invention.

6, the reverse rotation device 800 includes a drive gear 810 connected to the rear end of the drive shaft 900 to rotate together with the drive shaft 900, A driven gear 820 connected to the front end of the outer shaft 300 or the front propeller hub 122 and at least one reverse gear unit for inverting and transmitting the rotation of the driving gear 810 to the driven gear 820 The outer shaft 300 includes the housing 840 and the thrust bearing 850 so as to prevent the outer shaft 300 from being pushed forward or backward relative to the hull H, can do.

The driving gear 810 may be fixedly connected to the rear end of the driving shaft 900 in a flange coupling manner and the driven gear 820 may be fixedly connected to the front end of the outer shaft 300 or the front surface of the front propeller hub 122 in a flange- Can be connected.

The driving gear 810 and the driven gear 820 may be of the same type as the gear type applied to the reverse gear unit 830 described later, for example, a helical gear type.

The reversing gear unit 830 is disposed on the outside of the first gear 831 and the first gear 831 and the driven gear 820 provided so as to be engaged with the outside of the driving gear 810, And a second gear 833 for transmitting the rotation of the first gear 831 to the driven gear 820 by engaging with the driven gear 820 on the other side. At this time, the second gear 833 is formed to have a large width so that both sides of the second gear 833 can be engaged with the first gear 831 and the driven gear 820 at the same time. The first gear 831 and the second gear 833 may be of a helical gear type.

When each of the driving gear 810, the driven gear 820, the first gear 831 and the second gear 831 and 833 is a helical gear type, it may be a single helical gear or a double helical gear.

The reverse gear unit 830 may include a first shaft 832 for supporting the first gear 831 and a second shaft 834 for supporting the second gear 833. The first shaft 832 and the second shaft 834 can be supported by a housing 840, which will be described later.

The first shaft 832 is coupled to the first gear 831 through a center of the first gear 831 and has one end connected to the first shaft 831 on the first side portion 842 of the housing 840, And can be rotatably supported by bearings 835.

The second shaft 834 is engaged with the second gear 833 in such a manner as to penetrate the center of the second gear 833 and the opposite ends thereof are connected to the first side portion 842 of the housing 840, And a shaft bearing 835, which will be described later, which are respectively installed on the shaft 843.

When the drive gear 810 rotates together with the drive shaft 900, the first gear 831 rotates in a direction opposite to the drive gear 810 and the second gear 833 rotates again And rotates in a direction opposite to that of the first gear 831. The driving gear 810 and the second gear 833 are rotated in the same direction so that the driven gear 820 engaging with the second gear 833 is rotated in the opposite direction to the second gear 833 and the driving gear 810 Direction. Since the rear propeller 110 is directly connected to the inner shaft 200 connected to the driving shaft 900, the front propeller 120 and the front propeller 120 are rotated in the same direction, Thereby realizing the opposite rotation of the rear propeller 110.

The housing 840 supports the first and second shafts 832 and 834 and supports the hull H forming the inner surface of the installation space so as to provide a space in which the thrust bearing portion 850, And a first side portion 842 and a second side portion 843 which are respectively bent and extended from both ends of the fixing portion 841. [

The thrust bearing portion 850 may include a forward thrust bearing 850a and a rear thrust bearing 850b so that the outer shaft 300 can prevent forward or backward pivoting with respect to the hull H.

The front thrust bearing 850a may be installed between the front portion of the reverse rotation device 800 and the housing 840 so as to be able to bear the thrust load acting on the bow side from the double inverted propeller 100 when the ship is advanced .

Specifically, the front thrust bearing 850a is disposed between the front end of the drive gear 810 and the housing 840, between the front end of the driven gear 820 and the housing 840, between the front end of the driven gear 820 and the front end of the first gear 831, Or between the housing 840 and the front end of the second gear 833 and the housing 840.

The rear thrust bearing 850b may be installed between the rear portion of the reverse rotation device 800 and the housing 840 so as to be able to bear the thrust load acting on the stern from the double inverted propeller 100 when the ship is backward .

More specifically, the rear thrust bearing 850b is disposed between the rear end of the drive gear 810 and the housing 840, between the rear end of the driven gear 820 and the housing 840, Or between the housing 840 and the rear end of the second gear 833 and the housing 840.

The front and rear thrust bearings 850a and 850b may be provided between the various gear surfaces and the inner surface of the housing 840 such that the front and rear thrust bearings 850a and 850b are positioned within the housing 840 to be protected And the size of the component can also be reduced. Further, the space for installing the thrust bearing is not required, and space utilization can be increased.

6, the reverse rotation device 800 including the thrust bearing according to the embodiment of the present invention is described as a helical gear type. However, other configurations such as a planetary gear type or a bevel gear type, The present invention is not limited thereto.

The present propulsion device for marine vessel 1 according to the present invention is provided with auxiliary bearings 612 and 622 between the inner shaft 200 and the main bearings 611 and 621 to form the main bearings 611 and 621, 621 by the auxiliary bearings 612, 622 by constituting the inner bearing bearing portion 600 so as to have the double bearing structure in which the inner bearing 200 and the auxiliary bearings 612, And the durability of the inner shaft 200 can be improved, as well as the replacement time of the main bearings 611 and 621, which are expensive consumables, can be prolonged.

The present embodiment is characterized in that stepped portions 613 and 623 are formed on the outer shaft 300 or the front propeller hub 122 where the double bearings with the main bearings 611 and 621 and the auxiliary bearings 612 and 622 are installed, The stepped portions 613 and 623 can be positioned on the basis of the double bearing mounting position so that the double bearing mounting operation can be facilitated and the front bearing side It is possible to cope with the thrust load acting on the rear side, and it is possible to prevent the double bearing from being separated or damaged by the thrust load.

The present embodiment is characterized in that the main bearings 611 and 621 and the liner fixing portions 411 and 421 of the inner shaft sealing portion 400 in the double bearing structure in which the main bearings 611 and 621 and the auxiliary bearings 612 and 622 are coupled, The fixing force of the main bearings 611 and 621 by the bearing fixing portions 614 and 624 is improved so that the bearing portions 613 and 623 together with the bearing fixing portions 614 and 624 The thrust load acting on the front side or the rear side can be compensated for, thereby preventing the double bearing from being separated or damaged due to the thrust load.

The present embodiment is characterized in that the lubricant supply lines 615 and 625 are formed so that lubricant can pass through the bearing fixing portions 614 and 624 so that the main bearings 611 and 621 and the auxiliary bearings 612 and 622 Thereby enabling effective lubrication of the coupled double bearings and their surroundings.

In this embodiment, the thrust bearing 850 is provided in the inverting and rotating device 800, so that the inner shaft 200 or the outer shaft (not shown) is provided for installing the thrust bearing 850 between the outer shaft 300 and the inner shaft 200 It is not necessary to separately process the inner shaft 200 or the outer shaft 300, thereby reducing the manufacturing cost of the inner shaft 200 or the outer shaft 300. [

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: Ship Propulsion System 100: Double Inversion Propeller
110: rear propeller 112: hub
114: wing 120: front propeller
122: hub 124: wing
200: inner shaft 300: outer shaft
400: inner shaft seal part 410: front inner shaft seal
411: liner fixing portion 412: liner contact portion
420: rear inner shaft seal 421: liner fixing portion
422: liner contact portion 500: outer shaft seal portion
510: front outer shoe seal 511: liner fixing portion
512: liner contact portion 520: rear outer sheath seal
521: liner fixing portion 522: liner contacting portion
600: Inner shaft bearing part 610: Front inner shaft bearing part
611: main bearing 612: auxiliary bearing
613: stepped portion 614: bearing fixing portion
614a: Body 614b: Fixing member
614c: pressure member 615: lubricating oil supply line
620: rear end bearing portion 621: main bearing
622: auxiliary bearing 623: stepped portion
624: Bearing fixing portion 614a: Body
624b: fixing member 624c: pressing member
625: Lubricant supply line 700: Outer shaft bearing part
710: front outer sheath bearing portion 720: rear outer sheath bearing portion
800: reverse rotation device 810: drive gear
820: driven gear 830: reverse gear unit
831: 1st gear 832: 1st axis
833: Second gear 834: Second shaft
835: Axial bearing 840: Housing
841: Fixing portion 842: First side portion
843: second side portion 850: thrust bearing portion
850a: Front thrust bearing 850b: Rear thrust bearing
900: drive shaft
G: Pore H: Hull
LS: Lubrication space LT: Lubricant supply part

Claims

A double reversing propeller consisting of a rear propeller connected to the inner shaft and a front propeller connected to the outer shaft;
A reverse rotation device including at least one gear and a housing covering the gear, the reverse rotation device inverting the rotation of the drive shaft to the front propeller and transmitting the rotation; And
And a thrust bearing portion provided between one surface of the gear and the inner surface of the housing for preventing the outer shaft from being pushed forward or backward with respect to the hull of the ship.

The apparatus according to claim 1,
A drive gear connected to the drive shaft or the outer shaft;
A driven gear connected to the outer shaft or the hub of the front propeller; And
And a reverse gear unit comprising at least one gear for inverting and transmitting the rotation of the drive gear to the driven gear,
The thrust bearing portion includes:
Is provided between a front end portion or a rear end portion of at least any one of the drive gear, the driven gear, and the reverse gear unit, and the housing.

3. The thrust bearing according to claim 2,
A forward thrust bearing installed between the front portion of the reversing and rotating device and the housing to support a thrust load acting on the bow from the double reversing propeller when the ship is advanced; And
And a rear thrust bearing provided between the rear portion of the inverting and rotating unit and the housing to support a thrust load acting on the stern from the double inverted propeller when the ship is reversed.

The reversing gear unit according to claim 3,
A first gear provided to engage with the driving gear; And
And a second gear installed between the first gear and the driven gear.

5. The planetary gear set according to claim 4,
At least one of a front end portion of the drive gear and the housing, a front end portion of the driven gear and the housing, a front end portion of the first gear and the housing, and a front end portion of the second gear and / Wherein the propulsion device is mounted on the ship.

5. The apparatus of claim 4, wherein the rear thrust bearing comprises:
At least one of a rear end portion of the drive gear and the housing, a rear end portion of the driven gear and the housing, a rear end portion of the first gear and the housing, a rear end portion of the second gear, Wherein the propulsion device is mounted on the ship.

The connector according to claim 1,
Wherein the propulsion device is fixed to the hull.