KR20120135576A - Propulsion apparatus for ship, and ship having the same - Google Patents

Propulsion apparatus for ship, and ship having the same Download PDF

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Publication number
KR20120135576A
KR20120135576A KR1020110054361A KR20110054361A KR20120135576A KR 20120135576 A KR20120135576 A KR 20120135576A KR 1020110054361 A KR1020110054361 A KR 1020110054361A KR 20110054361 A KR20110054361 A KR 20110054361A KR 20120135576 A KR20120135576 A KR 20120135576A
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KR
South Korea
Prior art keywords
drive shaft
propeller
hull
bevel gear
ship
Prior art date
Application number
KR1020110054361A
Other languages
Korean (ko)
Inventor
김지남
박현상
박형길
백광준
이동현
이진석
이태구
정성욱
권혁
서용석
최태삼
호시노
Original Assignee
삼성중공업 주식회사
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Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR1020110054361A priority Critical patent/KR20120135576A/en
Publication of KR20120135576A publication Critical patent/KR20120135576A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/02—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing
    • B63H23/08—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing with provision for reversing drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
    • B63H5/10—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller of coaxial type, e.g. of counter-rotative type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/321—Bearings or seals specially adapted for propeller shafts
    • B63H2023/323—Bearings for coaxial propeller shafts, e.g. for driving propellers of the counter-rotative type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/321—Bearings or seals specially adapted for propeller shafts
    • B63H2023/325—Thrust bearings, i.e. axial bearings for propeller shafts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gear Transmission (AREA)

Abstract

PURPOSE: A propulsion device and a ship with the same are provided to install a counter rotating device in the tail end of a hull by reducing the volume of the counter rotating device as the counter rotating device is composed of multiple bevel gears. CONSTITUTION: A propulsion device for a ship comprises a rear propeller(20), a front propeller(30), a counter rotating device(70), and a radial bearing(51). The rear propeller is fixed in a driving shaft. The front propeller is rotatably supported in the driving shaft. The counter rotating device comprises multiple bevel gears. The bevel gears are installed in the tail end of a hull, reverse the rotation of the driving shaft, and transmit the reversed rotation to the front propeller. The radial bearing is installed in the driving shaft and the hull. An inner wheel and an outer wheel of the radial bearing are separated.

Description

[0001] PROPULATION APPARATUS FOR SHIP AND SHIP HAVING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device for a ship and a ship equipped with the propulsion device, and more particularly, to a propulsion device for a ship in which two propellers rotate in opposite directions to generate propulsive force and a ship equipped with the propulsion device.

The propulsion unit on the ship is a device that generates propulsion force for the operation. The most common one is the use of a single spiral propeller. However, the propulsion system equipped with one propeller has a large energy loss because the rotational energy of the water stream can not be utilized as a propulsion force.

There is a counter rotating propeller (CRP) that can recover lost rotational energy by propulsion. In the double reversing propulsion system, two propellers installed on the same axis rotate propelling each other to generate propulsive force. The rotational energy of the fluid passing through the forward propeller can be recovered by propulsion by rotating the propeller in the reverse direction. Therefore, it is possible to exhibit a high propulsion performance compared to the propulsion device having a single propeller.

The double reversing propulsion device has an inner shaft connected to the engine inside the hull, a rear propeller coupled to the inner shaft rear end, a hollow outer shaft provided to rotate on the outer surface of the inner shaft, and a front propeller coupled to the outer shaft rear end. And a reverse rotation device provided inside the hull to transmit the rotation of the inner shaft to the outer shaft for transmission. As the reverse rotation device, a conventional planetary gear device is used.

 However, since the double reversing propulsion device has a hollow outer shaft extending from the reverse rotation device to the rear of the hull, it is very difficult to align the inner shaft and the outer shaft when installing the ship on the ship. In addition, since the external axis is long, the area to be lubricated increases in order to reduce the friction between the internal axis and the external axis. In addition, since the inner shaft and the outer shaft rotate in opposite directions, the shearing of the lubricating film formed between the inner shaft and the outer shaft is generated, so that it is difficult to realize effective lubrication.

The embodiment of the present invention is intended to provide a propulsion device for a ship capable of implementing mutual inversion of two propellers without an outer shaft and a ship equipped with the propulsion device.

The embodiment of the present invention is intended to provide a propulsion device for a ship which is easy to install and a ship equipped with the propulsion device.

According to one aspect of the invention, the rear propeller fixed to the drive shaft; A front propeller rotatably supported on the drive shaft in front of the rear propeller; A reverse rotation device installed on the rear side of the hull and having a plurality of bevel gears for inverting and transmitting the rotation of the drive shaft to the front propeller; A ship propulsion device may be provided between the driving shaft in front of the reverse rotation device and the hull and include a radial roller bearing capable of separating the outer and inner rings.

The reverse rotation device includes a driven bevel gear fixed to the drive shaft, a driven bevel gear fixed to a hub of the forward propeller, and at least one inverted bevel gear for inverting and transmitting rotation of the driven bevel gear to the driven bevel gear .

The drive shaft may include a flange portion formed on an outer surface thereof for mounting the drive bevel gear and having a first stepped portion, a second stepped portion formed on the rear of the flange portion to have an outer diameter smaller than the first stepped portion for mounting the forward propeller, And a tapered portion formed behind the second step portion for mounting the rear propeller.

The radial roller bearing may include a plurality of rollers installed between the outer ring and the inner ring, and retainers for supporting the rollers. The outer ring has jaws that are supported by both ends of the roller on both sides of an inner surface thereof. The inner ring may have a planar shape in the axial direction so that the inner ring may be separated in the axial direction.

The outer ring and the inner ring of the radial roller bearing are fixed to the bearing support of the hull and the outer surface of the drive shaft in a state where they are separated from each other, and may be incorporated in the process of installing the drive shaft on the hull.

In the propulsion device according to the embodiment of the present invention, the inversion rotating device can be constituted by a plurality of bevel gears and the volume thereof can be reduced, so that the inversion rotating device can be installed at the rear of the hull.

Further, since the propelling device according to the embodiment of the present invention can directly connect the bevel gear and the front propeller of the reverse rotation device, it is possible to transmit the power to the front propeller without using the outer shaft unlike the prior art, Can be implemented.

Further, since the propulsion device according to the embodiment of the present invention does not use the outer shaft, it is possible to easily perform the operation of installing the drive shaft and aligning the center of the shaft after installation.

Further, since the propulsion device according to the embodiment of the present invention can be installed by inserting the reverse rotation device from the rear of the hull to the installation space provided at the back of the hull, installation work of the propulsion device can be easily performed.

In addition, the propulsion device according to the embodiment of the present invention can easily install the drive shaft and the radial roller bearing because the outer ring and the inner ring of the radial roller bearing is installed between the drive shaft and the hull.

In addition, since the propulsion device according to the embodiment of the present invention does not use outer shafts, it is possible to reduce the area required for lubrication and minimize the problems caused by lubrication.

1 is a sectional view showing a state in which a propulsion device according to an embodiment of the present invention is applied to a ship.
2 is a cross-sectional view of a propulsion device according to an embodiment of the present invention.
3 is an exploded perspective view of a propulsion device according to an embodiment of the present invention.
Figure 4 is a cross-sectional view showing the configuration of the support ring of the propulsion device according to an embodiment of the present invention.
5 is a cross-sectional view showing an example of mounting the rear propeller of the propulsion apparatus according to the embodiment of the present invention.
FIG. 6 illustrates a method of installing the inverted bevel gear and the casing assembly of the propulsion device in the hull rear space according to the embodiment of the present invention.
7 is a side view of the inverting bevel gear and casing assembly of the propulsion device according to an embodiment of the present invention.
8a and 8b show step by step the installation of the radial roller bearing installed between the drive shaft and the hull of the propulsion apparatus according to an embodiment of the present invention.
9 is a perspective view of a radial roller bearing installed between the drive shaft and the hull of the propulsion apparatus according to the embodiment of the present invention.
10 is a cross-sectional view of a first sealing device of the propulsion device according to the embodiment of the present invention.
11 is an exploded perspective view of a first sealing device of a propulsion device according to an embodiment of the present invention.
12 is a cross-sectional view of a second sealing device of the propulsion device according to the embodiment of the present invention.

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

As shown in FIG. 1, the propulsion device according to the embodiment of the present invention is provided with a double reversing propulsion system, which is installed at the rear end 3 of the hull 1 and in which propellers 20, Device. Here, the tail 3 of the hull 1 refers to a portion protruding in a streamlined form from the hull 1 to the rear to support the drive shaft 10 in which the two propellers 20 and 30 are installed, that is, the stern boss. ).

2 and 3, the propulsion device includes a drive shaft 10 extending outward from the inside of the hull 1 through the hull aft 3, and a rear propeller 20 fixed to the rear end of the drive shaft 10. , The reverse propeller 30 for inverting and transmitting the rotation of the front propeller 30 and the drive shaft 10 to the front propeller 30 so as to be rotatably supported on the outer surface of the drive shaft 10 in front of the rear propeller 20. Equipped.

1 and 2, the drive shaft 10 is connected to a drive source (2, a diesel engine, a motor, a turbine, etc.) provided inside the hull 1 and passes through the tail 3 of the hull 1 And extends outside the hull. The driving shaft 10 is rotated by the driving source 2 to rotate the rear propeller 20 fixed to the rear end thereof.

As shown in FIG. 2, the driving shaft 10 is provided with a multi-stage outer surface for sequentially installing a reverse rotation device 70, a front propeller 30, and a rear propeller 20 on the outside thereof. A flange portion 11 having a first stepped portion 12 is provided at a portion where the reverse rotation device 70 is installed, and a first stepped portion (11) behind the flange portion 11 for mounting the front propeller 30. The second step portion 13 is provided with an outer diameter smaller than 12). In order to mount the rear propeller 20, the tapered portion 14 is formed behind the second step portion 13 in such a manner that its outer diameter decreases toward the rear. The flange portion 11 may be integrally formed with the drive shaft 10 or may be separately manufactured and then press-fitted into the outer surface of the drive shaft 10.

The rear propeller 20 includes a hub 21 fixed to the rear portion of the drive shaft 10 and a plurality of blades 22 provided on the outer surface of the hub 21. [ The rear propeller 20 is fixed to the drive shaft 10 by pressing the shaft coupling hole 23 formed at the center of the hub 21 into the outer surface of the tapered portion 14 of the drive shaft 10. Further, the fixing nut 24 is fastened to the rear end of the driving shaft 10 to be more firmly fixed to the driving shaft 10. The shaft coupling hole 23 of the hub 21 may be provided in a shape corresponding to the outer surface of the tapered portion 14 of the drive shaft 10. [ 2, reference numeral 25 denotes a propeller cap mounted on the rear propeller hub 21 so as to cover the rear surface of the rear propeller hub 21 and the rear end of the drive shaft 10. [

The front propeller (30) is rotatably installed on the outer surface of the drive shaft (10) at a position spaced forward from the rear propeller (20). The front propeller 30 includes a hub 31 rotatably supported on the outer surface of the drive shaft 10 and a plurality of blades 32 provided on the outer surface of the hub 31. [ Since the front propeller 30 rotates in a direction opposite to that of the rear propeller 20, the blade angle is opposite to the blade angle of the rear propeller 20.

The center of the hub 31 of the front propeller 30 is rotatably supported by the radial bearing 51 and both sides of the hub 31 are rotatably supported by the front thrust bearing 52 and the rear thrust bearing 53 .

The inner race of the front thrust bearing 52 is caught by the jaws of the second step portion 13 of the drive shaft 10 and the outer race is supported by the front bearing support portion 33 of the hub 31. The rear thrust bearing 53 is supported so that the inner ring is not pushed axially by the support ring 60 mounted on the outer surface of the drive shaft 10 and the outer ring is supported by the rear bearing support 34 of the hub 31. The radial bearing 51 suffers the radial load of the front propeller 30 acting in the radial direction of the drive shaft 10 and the front and rear thrust bearings 52 and 53 are supported on the drive shaft 10 in the longitudinal direction So as to be able to cope with the respective thrust loads acting thereon. In particular, the front thrust bearing 52 suffers a thrust load acting on the bow from the forward propeller 30 when the ship is advanced, and the rear thrust bearing 53 suffers from the thrust force acting on the stern from the forward propeller 30, It carries the load.

The hub 31 of the front propeller 30 may be provided with reinforcing members 41 and 42 at the positions where the front and rear bearing supports 33 and 34 are provided. The rigidity of the hub 31 is increased by providing the reinforcing members 41 and 42 at the portions where the front thrust bearing 52 and the rear thrust bearing 53 are installed. The reinforcing members 41 and 42 may be made of a steel material having a higher rigidity than the hub 31. [ The reinforcing member 43 may be provided on the front surface of the hub 21 of the rear propeller 20 in a portion contacting the support ring 60 in the same manner.

4, the support ring 60 includes a first support ring 61 and a second support ring 62, which are divided on both sides to form a semicircular shape, and engagement bolts 63 for fastening them, Lt; / RTI > 5, the front propeller 30 and the rear thruster bearing 53 are installed on the drive shaft 10 and then the rear propeller 20 hub 21 is press-fitted into the drive shaft 10 The supporting ring 60 can be installed between the rear propeller hub 21 and the rear thrust bearing 53 in a combined state.

When the rear propeller 20 is installed on the drive shaft 10 in a press-fitting manner, there arises a coupling error of the rear propeller due to the environment, so that the distance between the rear thrust bearing 53 and the rear propeller hub 21 It is difficult to maintain the accuracy exactly. Therefore, after the rear propeller 20 is assembled first, the distance between the rear thrust bearing 53 and the rear propeller hub 21 is measured, and the support ring 60 is manufactured in accordance with the gap to mount the support ring 60 on the drive shaft 10, And the like. 4, the divided first support ring 61 and the second support ring 62 may be fixed to the outer surface of the drive shaft 10 by fastening the engagement bolts 63 to both sides thereof .

The reverse rotation device 70 is installed at the rear end 3 of the hull 1 adjacent to the hub 31 of the front propeller 30 as shown in Fig. To this end, a hull 3 is provided with an installation space 4 for accommodating the reverse rotation device 70. The installation space 4 can be provided in the form of a cylinder whose center coincides with the center of the drive shaft 10 and is open rearward facing the front propeller hub 31.

2 and 3, the reverse rotation device 70 includes a drive bevel gear 71 fixed to the flange portion 11 of the drive shaft 10 to rotate together with the drive shaft 10, a drive bevel gear A driven bevel gear 72 fixed to the front surface of the hub 31 of the front propeller 30 in such a manner that the driven bevel gear 71 faces the driven bevel gear 71, And an inverted bevel gear 73. In addition, the cylindrical casing 75 is provided to surround the outside of the reverse bevel gear 73 to support the plurality of reverse bevel gear shaft (74).

 The driving bevel gear 71 is fixed to the flange portion 11 by fastening a plurality of fixing bolts 71a in a state where the driving bevel gear 71 is supported by the first step portion 12 of the flange portion 11. [ The driven bevel gear 72 is also fixed to the hub 31 by fastening a plurality of fixing bolts 72a in a state where the rear surface of the driven bevel gear 72 is in contact with the front propeller hub 31. [ The inner diameter portion of the driven bevel gear 72 is spaced apart from the outer surface of the drive shaft 10 in order to prevent friction during rotation. 2 shows the manner in which the driven bevel gear 72 is engaged by fastening bolts 72a but the driven bevel gear 72 is welded to the forward propeller hub 31 or integrated with the forward propeller hub 31 .

The plurality of inverted bevel gears 73 are interposed between the driven bevel gears 71 and the driven bevel gears 72, respectively. A shaft 74 supporting each of the inverted bevel gears 73 is formed in a direction intersecting the drive shaft 10 and can be radially arranged around the drive shaft 10. 2 and 7, the outer end of the inverted bevel gear shaft 74 may be fixed to the inner surface of the casing 75 by bolting or welding. A bearing 73a may be provided between each of the inverted bevel gears 73 and the shaft 74 for supporting the inverted bevel gears 73 for smooth rotation of the inverted bevel gears 73.

In this embodiment, a plurality of the inverted bevel gears 73 are exemplified. However, since the inverted bevel gears 73 may be capable of reversing the rotation of the driven bevel gears 71 and transmitting them to the driven bevel gears 72, There is no need to be plural. In the case of a small ship with a small driving load, it is possible to implement the function even with only one inverted bevel gear.

6 and 7, the inverted bevel gears 73 are inserted into the installation space 4 together with the casing 75 while being mounted on the inner surface of the casing 75 by the shaft 74 As shown in FIG. To this end, the outer surface of the casing 75 is formed long in the axial direction of the drive shaft 10 to guide the installation and limit the rotation of the casing 75 after installation, and a plurality of coupling rails 76 protruding from the outer surface are provided. . A plurality of engaging grooves 77 are formed on the inner surface of the mounting space 4 so that the engaging rails 76 can be correspondingly engaged. This is because the inverted bevel gears 73, the shaft 74, and the casing 75 can be assembled together as one assembly to facilitate installation. Here, the casing 75 is coupled to the plurality of coupling rails 76 by the plurality of coupling grooves 77, but the casing 75 may be rotated only after the installation, And may be in the form of being combined by one coupling groove.

The reverse rotation device 70 reverses the rotation of the drive bevel gear 71 and transmits the rotation of the drive bevel gear 71 to the driven bevel gear 72 so that the driven bevel gear 72 and the driven bevel gear 71 rotate, It is possible to rotate in the opposite direction. Therefore, the reciprocal rotation of the front propeller (30) directly connected to the driven bevel gear (72) and the rear propeller (20) directly connected to the drive shaft (10) can be realized.

Also, since the inversion device 70 of the present embodiment realizes the inversion through the plurality of bevel gears 71, 72, and 73, the volume thereof can be reduced as compared with the conventional planetary gear type inversion device. Therefore, it is possible to mount the rear end of the hull 3 without increasing the volume of the rear end of the hull. Further, since the inverting rotating device 70 can be mounted on the rear end 3 of the hull, the driven bevel gear 72 and the front propeller hub 31 can be directly connected.

Particularly, in the present embodiment, the rear surface of the driven bevel gear 72 and the front surface of the front propeller hub 31 can be opposed to each other when the inverting rotating device 70 is installed, and the rotation of the driven bevel gear 72 and the hub 31 It is possible to directly connect the driven bevel gear 72 and the front propeller hub 31 since the centers can be matched. Therefore, it is possible to transmit the power to the front propeller 30 without using the outer shaft unlike the prior art. In addition, since there is no outer shaft, the friction factor of the drive shaft 10 can be reduced more than the conventional one, and the lubricating area can be reduced as compared with the conventional one. In addition, since there is no outer shaft, work for installing the drive shaft 10 and aligning the center of the shaft after installation can be easily performed.

Since the conventional planetary gear type inverting and rotating apparatus includes a sun gear installed on a drive shaft, a planetary gear provided outside the sun gear, and a cylindrical internal gear installed outside the planetary gear, the volume thereof is relatively large. In the planetary gear type reverse rotation device, the internal gear disposed at the outermost periphery must be rotated. Therefore, considering the outer casing, the volume becomes very large. Therefore, it is difficult to install it in the rear of the hull as in the case of the present embodiment. Even if it is installed at the back of the hull, there arises a problem of increasing the size of the rear of the hull. In order to transmit power from the cylindrical internal gear to the front propeller, a hollow shaft corresponding to the conventional outer shaft must be used. As a result, it is difficult to simplify the configuration and reduce the volume as in the present embodiment.

On the other hand, the propulsion device of the present embodiment, as shown in Figure 2, the radial roller bearing provided between the drive shaft 10 and the hull 1 in a position adjacent to the reverse rotation device 70 for the support of the drive shaft 10. 55 is provided. The radial roller bearing 55 supports the drive shaft 10 immediately before the reverse rotation device, thereby contributing to the smooth operation of the reverse rotation device 70. That is, the radial bearing 55 prevents the radial vibration or shaking of the drive shaft 10, thereby preventing the bite between the drive bevel gear 71 and the inverted bevel gear 73 and the bite between the inverted bevel gear 73 and the driven bevel gear 72 can be precisely maintained.

As shown in Figs. 8A, 8B, and 9, the radial roller bearing 55 has a plurality of rollers provided between the outer ring 55a, the inner ring 55c, the outer ring 55a, and the inner ring 55c. 55d), and retainer 55e for supporting a plurality of rollers 55d. 8A, the inner ring 55c can be separated from the outer ring 55a and the plurality of rollers 55d. This is because the inner surface of the outer ring 55a is provided with jaws 55b on both sides of the roller 55d, but the outer surface of the inner ring 55c has no jaws on both sides, i.e., a planar shape in the axial direction. In this case, the outer surface of the inner ring 55c means a flat shape in the axial direction, while the curved surface is maintained in the circumferential direction, but there is no jaw caught by both ends of the roller 55d in the axial direction. In the state where the inner ring 55d is separated, the plurality of rollers 55d can be supported by the retainer 55e on the inner surface side of the outer ring 55a.

The radial roller bearing 55 is coupled to the bearing support 7 and the drive shaft 10 outer surface of the hull 3 after the outer ring 55a and the inner ring 55c are separated from each other, and then the drive shaft 10. By integrating with each other in the installation process of the drive shaft 10 and the radial roller bearing 55 to facilitate the installation.

Referring to the installation process in detail, first, as shown in FIG. 8A, the outer ring 55a on which the plurality of rollers 55d are mounted is pressed into and fixed to the bearing support 7. Then, the inner ring 55c, which is separated, is also press-fitted to the installation position of the outer surface of the drive shaft 10 and fixed. In this state, the drive shaft 10 enters the hull 3 and is installed, and as shown in FIG. The installation of the drive shaft 10 is completed at the same time.

After installation, the radial roller bearing 55 may rotatably support the drive shaft 10 while limiting the radial shaking of the drive shaft 10. The radial roller bearing 55 is provided with a flange portion 11 on the outer surface of the drive shaft 10 as in the present embodiment, so that the radial roller bearing 55 and the drive shaft 10 may be difficult to install in a bearing or the like. ) Can be easily installed.

In the present embodiment, the radial roller bearing 55 has a shape in which a plurality of rollers 55d are positioned inside the outer ring 55a while the outer ring 55a and the inner ring 55c are separated, but the radial roller 55 The shape of the bearing is not limited to this. Unlike the aforementioned example, a plurality of rollers may be shaped to be supported on the outside of the inner ring by a retainer. In this case, the outer surface of the inner ring may have a jaw that both ends of the roller is caught on both sides, the inner surface of the outer ring may be a form without a jaw on both sides.

As shown in FIG. 2, the propulsion device of this embodiment includes a first sealing device 90 that seals between the rear hull 3 and the front propeller hub 31 to prevent intrusion of seawater (or fresh water) or foreign matter, And a second sealing device 110 for sealing between the front propeller hub 31 and the rear propeller hub 21 for the same purpose.

As shown in FIG. 10, the first sealing device 90 has a cylindrical first lining 91 provided on the front surface of the front propeller hub 31 and a first lining to contact an outer surface of the first lining 91. A cylindrical first sealing member 92 covering the outer surface of 91 and fixed at one end to the hull aft 3 is included.

The first sealing member 92 includes a plurality of packings 93a, 93b and 93c spaced apart from each other on the inner surface facing the first lining 91 and in contact with the outer surface of the first lining 91, , 93b, 93c) for supplying a fluid for sealing. The oil passage 95 of the first sealing member 92 can be connected to the lubricating oil supply passage 96 provided in the hull 1 so that lubricating oil having a predetermined pressure can be supplied. The lubricating oil having a pressure is supplied to the grooves between the respective packings 93a, 93b and 93c so that the respective packings 93a, 93b and 93c are pressed against the first lining 91 to come in close contact with each other, .

In addition, as shown in FIG. 11, the first lining 91 includes a first member 91a and a second member, each side of which is divided in a semicircular shape so as to be mounted after the front propeller 30 is installed on the drive shaft 10. 91b. The packing 91d can be interposed in the mutually divided portions 91c of the first and second members 91a and 91b so that sealing can be performed when they are mutually coupled. A first binding portion 91e protruding from one side of the divided portion 91c of the first member 91a and a second binding portion 91b protruding from the other side of the divided portion 91c are provided, 2 fastening portions 91f are provided, and the fixing bolts 91g are fastened to the two fastening portions 91f so that the two sides can be firmly engaged with each other. A plurality of fixing bolts 91i are fastened to the flange portion 91h fixed to the front propeller hub 31 to be firmly fixed to the hub 31.

The first sealing member 92 may also be a method of stacking and fixing a plurality of semicircular rings 92a, 92b and 92c in the longitudinal direction of the drive shaft 10 from the outside of the first lining 91. In this case, the plurality of rings 92a, 92b, 92c can be joined together by bolting or welding.

As shown in FIG. 12, the second sealing device 110 includes a cylindrical second lining 111 provided on the front surface of the rear propeller hub 21 and a second lining so as to contact the outer surface of the second lining 111. 111) It includes a cylindrical second sealing member 112 that covers the outer surface and one end thereof is fixed to the rear of the front propeller hub (31). The second sealing member 112 also includes a plurality of packings 113a, 113b, and 113c provided on the inner surface of the second sealing member 112 as well as the first sealing member 92 and a flow path 115 for supplying the fluid to the grooves between the packing.

The oil passage 115 of the second sealing member 112 is connected to the lubricating oil supply passage 120 provided at the center of the drive shaft 10. To this end, the drive shaft 10 and the support ring 60 are provided with a first connection passage 121 in the radial direction for connecting the lubricating oil supply passage 120 and the inner space 122 of the second lining 111, A second connection channel 123 connecting the inner space 122 of the second lining 111 and the channel 115 of the second sealing member 112 is formed in the reinforcing member 42 of the rear surface of the propeller hub 31 . Lubricating oil for sealing is supplied from the center of the drive shaft 10 toward the second sealing member 112 so as to press the packings 113a, 113b and 113c to thereby achieve sealing.

The second lining 111 and the second sealing member 112 are each formed in a semicircular shape like the first lining 91 and the first sealing member 92 of the first sealing device 90 so that the rear propeller 20 After the support ring 60 is installed.

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

When the drive shaft 10 is rotated by the operation of the internal drive source 2 of the hull 1, the propeller 20 rotates together with the rear propeller 20 in the same direction as the drive shaft 10 directly connected to the rear end of the drive shaft 10 . At the same time, the drive bevel gear 71 of the reverse rotation device 70 also rotates together with the drive shaft 10 since it is fixed to the drive shaft 10. The rotation of the driven bevel gear 71 is reversed by the plurality of inverted bevel gears 73 to be transmitted to the driven bevel gear 72 so that the driven bevel gear 72 rotates in the direction opposite to the drive shaft 10. Therefore, the front propeller 30 directly connected to the driven bevel gear 72 rotates in the direction opposite to the rear propeller 20.

The forward propeller 30 and the rear propeller 20, which rotate in opposite directions, generate propelling water in the same direction because their blade angles are opposite to each other. In other words, when the ship moves forward, the propulsion water is generated backward, and when the ship is backward, the propulsion water is generated forward while rotating in the reverse direction. In addition, the propulsion performance of the propulsion water generated when advancing is improved because propulsion power of the fluid through the forward propeller 30 is recovered by the propulsion force of the propeller 20 while being reversed. The same goes for backward.

On the other hand, since the forward propeller 30 generates propelling water rearward when it is advanced, it receives a reaction force corresponding thereto. This force is transmitted to the drive shaft 10 through the front thrust bearing 52 and acts as propulsive force. The rear propeller 20 is also subjected to a reaction force because it generates propelling water rearward when it is advanced. This force is also transmitted to the direct drive shaft 10 and acts as propulsion force.

The propulsive force of the forward propeller 30 is transmitted to the drive shaft 10 through the rear thrust bearing 53 and the propulsive force of the rear propeller 20 is also transmitted to the drive shaft 10 directly connected to the ship. As a result, the propulsion system of the present embodiment transmits the driving force generated by the operation of the front propeller 30 and the rear propeller 20 to the hull 1 through the drive shaft 10 when the ship moves forward and backward.

1: hull, 2: driving source,
3: rear of hull, 4: installation space,
10: drive shaft, 20: rear propeller,
30: front propeller, 41, 42: reinforcing member,
51: radial bearing, 52: forward thrust bearing,
53: rear thrust bearing, 55: radial roller bearing,
60: support ring, 70: reverse rotation device,
71: driven bevel gear, 72: driven bevel gear,
73: reverse bevel gear, 75: casing,
90: first sealing device, 110: second sealing device.

Claims (6)

A rear propeller fixed to the drive shaft;
A front propeller rotatably supported on the drive shaft in front of the rear propeller;
A reverse rotation device installed on the rear side of the hull and having a plurality of bevel gears for inverting and transmitting the rotation of the drive shaft to the front propeller;
And a radial roller bearing installed between the drive shaft and the hull in front of the reverse rotation device and capable of separating an outer ring and an inner ring. The method of claim 1,
The inversion rotating device includes a driving bevel gear fixed to the drive shaft, a driven bevel gear fixed to the hub of the front propeller, and one or more inverted bevel gears for inverting and transmitting rotation of the driving bevel gear. Marine propulsion system. The method of claim 2,
The drive shaft is formed on the outer surface of the drive bevel gear for mounting the flange portion having a first step portion, the second step portion formed with an outer diameter smaller than the first step portion behind the flange portion for mounting the front propeller And a tapered portion formed behind the second stepped portion for mounting the rear propeller. The method of claim 1,
The radial roller bearing includes a plurality of rollers installed between the outer ring and the inner ring, and retainers for supporting these rollers,
The outer ring has a jaw that is supported by both ends of the roller on both sides of the inner surface,
The inner ring is a marine propulsion device, characterized in that the outer surface is planar in the axial direction to be separated in the axial direction. The method of claim 1,
The outer ring and the inner ring of the radial roller bearing are fixed to the bearing support and the drive shaft outer surface of the hull in a state separated from each other, the propulsion device for a ship, characterized in that the coalescing in the process of installing the drive shaft to the hull. A ship equipped with the propulsion device according to any one of claims 1 to 5.
KR1020110054361A 2011-06-07 2011-06-07 Propulsion apparatus for ship, and ship having the same KR20120135576A (en)

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