KR20130110741A - Propulsion apparatus for ship, install method of the propulsion apparatus, and ship having the propulsion apparatus - Google Patents

Abstract

PURPOSE: A propulsion device for a ship, an installation method thereof, and a ship having the same are provided to simplify a power transfer system by not requiring a hollow shaft and reduce an area required for lubrication. CONSTITUTION: A propulsion device for a ship comprises a rear propeller (20), a front propeller (10), and a reversing and rotating device (30). The reversing and rotating device is composed of a drive bevel gear (33), a driven bevel gear (34), one or more reverse bevel gears (35), a cylindrical connection member (37), inner bearings (54, 55), and an outer bearing (57). The reverse bevel gears reverse the rotation of the drive bevel gear and transfer the reversed rotation to the driven bevel gear. The cylindrical connection member is installed on the outer side of a drive shaft and connects the driven bevel gear to the hub of the front propeller. The inner bearings are installed between the inner surface of the connection member and the outer surface of the drive shaft and support the connection member to be rotated.

Description

TECHNICAL FIELD [0001] The present invention relates to a propulsion device for a ship, a method of installing the propulsion device, and a ship equipped with the propulsion device,

The present invention relates to a propulsion device for a ship in which two propellers rotate in opposite directions to generate propulsion force, a method of installing the propulsion device, and a ship equipped with the propulsion device.

A typical marine propulsion system has one helical propeller. However, the propeller with one propeller has a large energy loss since the rotational energy of the water flow due to the propeller's rotation cannot be used as the propulsion force.

Counter rotating propeller (CRP) can recover lost rotational energy as propulsion. In the double reversing propulsion system, two propellers installed on the same axis rotate propelling each other to generate propulsive force. The rotational energy of the fluid passing through the forward propeller is recovered by propulsive force while the propeller is rotating backward. Therefore, it is possible to exert a higher propelling performance than a propelling device equipped with one propeller.

However, since the dual inversion propulsion system includes the inverse rotation device and the hollow shaft which realize the opposite rotation of the two propellers, it is difficult to manufacture and install relatively, and the high technology level do.

US Patent Publication No. US2011 / 0033296 (published on Mar. 10, 2011) and Japanese Patent Laid-Open Publication No. 62-249189 (published on December 04, 1987) disclose an example of a double- There is a bar. US Patent Application Publication No. US2011 / 0033296 discloses a double reversing propulsion device having a hollow shaft and a planetary gear type reverse rotation device installed in a hull. Japanese Patent Laid-Open Publication No. 62-279189 discloses a planetary gear type reverse rotation device A dual inversion rotating device is disclosed.

Patent Document 1: U.S. Published Patent Application No. US2011 / 0033296 (published on Mar. 10, 2011) Patent Document 2: JP-A-62-279189 (published on December 04, 1987)

An embodiment of the present invention is to provide a ship propulsion apparatus and a method for installing the ship propulsion apparatus that can be easily installed, as well as to implement a stable mutual reversal of the two propellers, while simplifying the power transmission system.

According to an aspect of the present invention, a rear propeller fixed to a drive shaft, a front propeller rotatably supported by the drive shaft in front of the rear propeller, installed on the rear side of the hull and inverted to transmit the rotation of the drive shaft to the front propeller It includes a reverse rotation device, wherein the reverse rotation device is a drive bevel gear fixed to the drive shaft, driven bevel gears rotatably supported around the drive shaft, inverts the rotation of the drive bevel gears to transfer to the driven bevel gears At least one inverted bevel gear, a cylindrical connecting member installed outside the drive shaft and connecting the driven bevel gear and the hub of the front propeller, installed between the inner surface of the connecting member and the outer surface of the drive shaft to rotatably support the connecting member. Inner bearing to rotatably support the outer surface of the connecting member A marine propulsion device may be provided that includes an outer bearing.

The driving bevel gear, the driven bevel gear, and the inverted bevel gear may be accommodated in a gear chamber having a rear surface open at the rear side of the hull, and the reverse rotation device may be disposed between the outer bearing and the hull rear. It may further include a cover member installed to close the rear opening of the gear chamber.

The inner bearing may include a first inner bearing and a second inner bearing disposed to be spaced apart from each other, and the reverse rotation device is interposed between the inner ring of the first inner bearing and the inner ring of the second inner bearing to support them. An inner support ring, an outer support ring interposed between the outer ring of the first inner bearing and the outer ring of the second inner bearing to support them, and an end of the connecting member coupled to the hub of the front propeller, the second inner side It may include a support ring for supporting the bearing.

According to another aspect of the present invention, there may be provided a vessel having the aforementioned propulsion device.

According to another aspect of the invention, the step of installing the drive bevel gear and the inverted bevel gear in the gear chamber, and after the drive and the reverse bevel gear is installed in the state where the driven bevel gear into the gear chamber Installing the first inner bearing on an outer surface of the drive shaft; and installing the second inner bearing after installing the inner and outer support rings on an outer surface of the drive shaft; and installing the outer bearing on an outer side of the connecting member. Installing the connecting member to the outside of the first and second inner bearings, connecting the rear bevel gear and the connecting member, and installing the support ring to the connecting member to the second inner side. There may be provided a method of installing a marine propulsion device comprising a step of supporting a bearing and a step of connecting the connecting member and the hub of the front propeller. have.

The installation method may include a step of closing the rear opening of the gear chamber by installing the cover member before connecting the connection member and the front propeller.

Since the propulsion device according to the embodiment of the present invention implements the reversal of the front propeller using a plurality of bevel gears, it can reduce the volume and simplify the configuration of the power transmission system as compared with the conventional planetary gear type reverse rotation device. have. In addition, since the volume of the inverting rotating device can be reduced, it is possible to install the inverting rotating device at the rear of the hull.

In addition, the propulsion device according to the present embodiment can be installed in such a way that the parts of the reverse rotation device to the gear chamber from the rear of the hull is easy to install and troubleshoot.

In addition, in the propulsion device according to the present embodiment, since the connecting member connecting the driven bevel gear and the front propeller is stably supported by the first and second inner and outer bearings, the reverse rotation device is transferred from the front propeller toward the driven bevel gear. The irregular external force or vibration can be minimized. Therefore, stable operation of the reverse rotation device can be realized.

In addition, the propulsion device according to the embodiment of the present invention can eliminate the hollow shaft as in the conventional art by installing the reversing and rotating device on the rear side of the hull, so that the power transmission system can be simplified and the area required for lubrication can be reduced , It is possible to minimize the problems caused by lubrication.

1 is a sectional view showing a state in which a propulsion device according to an embodiment of the present invention is applied to a ship.
2 is a cross-sectional view of a propulsion device according to an embodiment of the present invention.
3 is an exploded perspective view of a propulsion device according to an embodiment of the present invention.
4 is a cross-sectional view showing the structure of a support ring of the propulsion device according to the embodiment of the present invention.
5 is a sectional view showing an example of mounting a propeller of a propulsion device according to an embodiment of the present invention.
6 and 7 are cross-sectional views showing a step of installing a reverse rotation device of the propulsion device according to an embodiment of the present invention, Figure 6 shows a state in which the support ring and the cover member is separated, Figure 7 is a reverse rotation device The state of assembly is completed.
8 is a sectional view of the first sealing device of the propulsion device according to the embodiment of the present invention.
9 is an exploded perspective view of the first sealing device of the propulsion device according to the embodiment of the present invention.
10 is a cross-sectional view of a second sealing device of the propulsion apparatus 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.

Ship propulsion apparatus according to an embodiment of the present invention is fixed to the rear end of the drive shaft 40, the drive shaft 40 extending outwards through the hull aft 3 from the inside of the hull 1 as shown in FIG. Reverse propeller (20), the reverse propeller 10 for rotating the forward propeller 10, the drive shaft 40, which is rotatably supported on the outer surface of the drive shaft 40 in front of the rear propeller 20, forward propeller 10 Apparatus 30 is provided. In other words, the front propeller 10 and the rear propeller 20 is a double reversal propulsion device to generate a propulsion force while rotating opposite to each other.

The rear end 3 of the hull 1 supports the drive shaft 40 on which the front propeller 10 and the rear propeller 20 are installed, and at the same time, the rear end from the hull 1 for the installation of the reverse rotation device 30. Stern boss that protrudes in a streamlined direction.

As shown in FIG. 1, the drive shaft 40 is connected to a drive source 4 (a diesel engine, a motor, a turbine, etc.) installed inside the hull 1, and penetrates the rear end 3 of the hull 1 so that the hull ( Extends outside of 1). The drive shaft 40 rotates the rear propeller 20 fixed to the rear end while rotating by the drive source (4).

As shown in FIG. 2, the drive shaft 40 may be provided with a multi-stage outer surface to sequentially install the reverse rotation device 30, the front propeller 10, and the rear propeller 20 on the outside thereof. That is, the first outer diameter portion 41, which is provided with a larger diameter relative to the position where the reverse rotation device 30 is installed, is provided with a smaller diameter than the first outer diameter portion 41 behind the first outer diameter portion 41. The second outer diameter portion 42 supporting the front propeller 10, the third outer diameter portion provided with a smaller diameter than the second outer diameter portion 42 behind the second outer diameter portion 42 and the rear propeller 20 is fixed (43). The outer surface of the third outer diameter portion 43 may be configured as a tapered surface that gradually decreases the outer diameter toward the rear for fixing the rear propeller 20. In addition, the first outer diameter portion 41 may be provided with a flange portion 44 for installation of the reverse rotation device (30). The flange portion 44 may be provided integrally with the drive shaft 40 or may be separately manufactured and then installed in a press-fit manner to the outer surface of the drive shaft 40.

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

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

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

The front thrust bearing 72 may be supported by a stepped portion provided with an inner ring between the second outer diameter portion 42 and the first outer diameter portion 41 of the drive shaft 40, and the outer ring may be supported by the front of the hub 11. It can be supported by the bearing support (11a). The rear thrust bearing 73 may be supported such that the inner ring is not pushed in the axial direction by the support ring 80 mounted on the outer surface of the drive shaft 40, and the outer ring is supported by the rear bearing support 11b of the hub 11. Can be.

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

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

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

When installing the support ring 80, the rear propeller 20 is assembled first, and then the support shaft 80 is manufactured by measuring the distance between the rear thrust bearing 73 and the rear propeller hub 21 and manufacturing a support ring 80 according thereto. 40), it is possible to achieve a precise coupling. And, as shown in Figure 4, the divided first support ring 81 and the second support ring 82 can be fixed by engaging the coupling bolts 83 on both sides after coupling to the outer surface of the drive shaft (40). have. When the support ring 80 is installed, the rear propeller 20 may be coupled to the drive shaft 40 by a press-fit method, thereby causing a coupling error of the rear propeller 20 according to the environment, and thus the rear thrust bearing 73 and the rear propeller hub 21. This is because it is difficult to keep the space between the two points accurately.

As shown in FIG. 2, the reverse rotation device 30 is provided on the rear 3 side of the hull 1 adjacent to the hub 11 of the front propeller 10. To this end, the hull aft 3 is provided with a gear chamber 32 that can accommodate the reverse rotation device 30 inside. The gear chamber 32 has an open rear surface facing the front propeller hub 11 so that the parts of the reverse rotation device 30 can be installed from the rear of the hull 1.

The reverse rotation device 30 is rotatably supported by the drive bevel gear 33 fixed to the drive shaft 40 inside the gear chamber 32, the drive shaft 40 inside the gear chamber 32, and the front propeller 10. And a plurality of inverted bevel gears 35, driven bevel gears 34, and front propellers which inverts and rotates the driven bevel gears 34 and the driving bevel gears 33 connected to the driven bevel gears 34, respectively. It may include a cylindrical connecting member 37 for connecting the hub 11 of the), and a cover member 51 for closing the open back of the gear chamber (32).

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

The plurality of inverted bevel gears 35 are interposed between the driven bevel gear 33 and the driven bevel gear 34 in a bite state. The shaft 36 supporting each of the inverted bevel gears 35 may extend in a direction crossing the driving shaft 40, and a plurality of shafts 36 may be radially disposed about the driving shaft 40. As shown in Fig. 2, each of the inverted bevel gear shafts 36 can be fixed to the inner surface of the gear chamber 32 by bolt fastening or welding. A bearing 35a may be provided between the inverted bevel gear 35 and the shaft 36 for supporting the inverted bevel gear 35 for smooth rotation of the inverted bevel gear 35.

In this embodiment, a plurality of the inverted bevel gears 35 are provided. However, since the inverted bevel gears 35 may be capable of reversing the rotation of the driven bevel gears 33 to the driven bevel gears 34, It does not have to be plural. A small ship with a small driving load would be able to implement its function with only one inverted bevel gear.

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

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

As such, the connection member 37 may rotate while maintaining a stable coupling since the inner surface is supported by the first and second inner bearings 54 and 55 and the outer surface is supported by the outer bearing 57. The driven bevel gear 34 coupled to) can also rotate stably. In addition, since the connecting member 37 is stably supported by the first and second inner bearings 54 and 55 and the outer bearing 57, an irregular external force transmitted from the front propeller 10 toward the driven bevel gear 34 or Vibration can be minimized. In addition, since the inner surface of the connecting member 37 and the outer surface of the driving shaft 40 are kept apart by the first and second inner bearings 54 and 55, the connecting member 37 and the driving shaft 40 rotate in opposite directions. Nevertheless, smooth rotation can be achieved. In particular, the form in which the inner surface of the connecting member 37 and the outer surface of the drive shaft 40 are separated in this way prevents the phenomenon in which the lubricating oil filled between the connecting member 37 and the driving shaft 40 rotates oppositely. Can be.

6 and 7, the cover member 51 covering the opening of the rear of the gear chamber 32 is coupled to the outside of the outer bearing 57 and has a ring-shaped first having a tapered outer surface 52a. A tapered inner surface 53a coupled between the cover member 52 and the outer surface 52a of the first cover member 52 and the hull aft 3 and corresponding to the outer surface 52a of the first cover member 52 is provided. It may include a second cover member 53 provided.

The first cover member 52 may be coupled to the outer ring of the outer bearing 57 by a press-fit method, and the second cover member 53 may be inserted into a gap between the first cover member 52 and the hull aft 3. After being coupled in a losing manner, it may be fixed to the hull aft 3 by fastening a plurality of fixing bolts 53b. The outer surface 52a of the first cover member 52 and the inner surface 53a of the second cover member 53 which are in contact with each other may be made of an inclined tapered surface, thereby inducing easy coupling thereof. In the present exemplary embodiment, the cover member 51 includes a first cover member 52 and a second cover member 53 to which the cover members 51 are coupled to each other, but the cover member 51 is not limited thereto. It may be composed of one or more covers capable of closing the rear opening of the gear chamber 32.

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

In addition, since the inversion rotating device 30 of the present embodiment implements the mutual inversion of the two propellers 10, 20 through the plurality of bevel gears 33, 34, 35, the volume of the two propellers 10, Can be reduced. Therefore, it can be installed in a manner that is accommodated in the hull aft (3).

Since the conventional planetary gear type reverse rotation device includes a sun gear installed on the drive shaft, a planetary gear installed outside the sun gear, and a cylindrical internal gear installed outside the planetary gear, its volume is relatively large. In addition, since the planetary gear type reverse rotation device has to rotate the internal gear disposed at the outermost part, the volume of the casing outside is inevitably increased. Therefore, it is practically very difficult to install it in the rear of the hull as in the case of the present embodiment. Even if it is installed in the hull tail, there is a problem to increase the size of the hull tail.

Referring back to FIG. 2, the reverse rotation device 30 includes a radial bearing interposed between the outer surface of the drive shaft 40 in front of the drive bevel gear 33 and the hull tail 3 for stable rotation of the drive shaft 40. 58 and a ring-shaped sealing member 59 provided in front of the radial bearing 58 for sealing between the outer surface of the drive shaft 40 and the hull aft 3. The radial bearing 58 may support the driving shaft 40 immediately before the driving bevel gear 33 to prevent radial vibration or shaking of the driving shaft 40. Therefore, it is possible to accurately hold the bite between the drive bevel gear 33 and the inverted bevel gear 35 and the bite between the inverted bevel gear 35 and the driven bevel gear 34.

In addition, the propulsion device of the present embodiment, as shown in Figure 2, the first seal for sealing between the hull aft 3 and the hub 11 of the front propeller 10 to prevent the ingress of seawater (or fresh water) or foreign matter Apparatus 90 and second sealing device 110 for sealing between hub 11 of front propeller 10 and hub 21 of rear propeller 20 for the same purpose.

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

The first sealing member 92 includes a plurality of packings 93a, 93b and 93c spaced apart from each other on the inner surface facing the first lining 91 and in contact with the outer surface of the first lining 91, , 93b, 93c) for supplying a fluid for sealing. The flow path 95 of the first sealing member 92 may be connected to the lubricating oil supply passage 96 provided in the hull aft 3 and the second cover member 53 so that lubricating oil having a predetermined pressure may be supplied. The lubricating oil having a pressure is supplied to the grooves between the respective packings 93a, 93b and 93c so that the respective packings 93a, 93b and 93c are pressed against the first lining 91 to come in close contact with each other, have.

As shown in FIG. 9, the first lining 91 includes a first member 91a and a second member, each of which is divided in a semicircular shape so as to be mounted after the front propeller 10 is installed on the drive shaft 40. 91b). The packing 91d can be interposed in the mutually divided portions 91c of the first and second members 91a and 91b so that sealing can be performed when they are mutually coupled. A first binding portion 91e protruding from one side of the first member 91a is provided on the divided partial free end side of the first member 91a and a second binding portion 91b protruding from the other side of the second binding portion 91b, And a fixing bolt 91g is fastened thereto, so that both sides can be firmly coupled to each other. The flange 91h fixed to the hub 11 of the front propeller 10 can be firmly fixed to the hub 11 by fastening a plurality of fixing bolts 91i.

In the case of the first sealing member 92, a plurality of rings 92a, 92b and 92c formed in a semicircular shape may be stacked and fixed in the longitudinal direction of the driving shaft 40 from the outside of the first lining 91. The plurality of rings 92a, 92b, 92c may be joined together by bolting or welding.

10, the second sealing device 110 includes a cylindrical second lining 111 provided on the front surface of the rear propeller hub 21 and a second lining 111 contacting the outer surface of the second lining 111. [ 111) outer surface and one end of which is fixed to the rear surface of the front propeller hub (11). The second sealing member 112 also includes a plurality of packings 113a, 113b, and 113c provided on the inner surface of the second sealing member 112 as well as the first sealing member 92 and a flow path 115 for supplying the fluid to the grooves between the packing.

The flow path 115 of the second sealing member 112 may communicate with the lubricating oil supply flow path 120 provided at the center of the drive shaft 40. To this end, a radial first connection passage 121 is formed in the drive shaft 40 and the support ring 80 to connect the lubricating oil supply passage 120 and the inner space 122 of the second lining 111. On the rear bearing support portion 11b on the rear side of the propeller hub 11, a second connection flow passage 123 communicating the inner space 122 of the second lining 111 and the flow path 115 of the second sealing member 112 is provided. Can be formed. Therefore, the lubricating oil supplied from the center of the drive shaft 40 toward the second sealing member 112 may press the packings 113a, 113b, and 113c, thereby realizing sealing.

The second lining 111 and the second sealing member 112 are each formed in a semicircular shape like the first lining 91 and the first sealing member 92 of the first sealing device 90 so that the rear propeller 20 After the support ring 80 is installed.

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

When installing the propulsion device, as shown in Figure 6, in the state in which the drive shaft 40 is installed in the hull 1, the components of the reverse rotation device 30 is installed in the gear chamber 32 of the hull aft 3 do. First, the drive bevel gear 33 and the plurality of inverted bevel gears 35 are installed in the gear chamber 32, and then the drive shaft 40 is in the state in which the driven bevel gear 34 enters the gear chamber 32. The first inner bearing 54 is installed on the outer surface.

After the first inner bearing 54 is installed, the inner support ring 56a and the outer support ring 56b are fitted to the outer surface of the drive shaft 40, and then the second inner bearing 55 is attached to the outer surface of the drive shaft 40. Install it. As such, when the inner support ring 56a and the outer support ring 56b are interposed between the first inner bearing 54 and the second inner bearing 55, the gap between the two inner bearings 54 and 55 can be maintained accurately. have. In this case, the inner ring of the first inner bearing 54 and the inner ring of the second inner bearing 55 may be coupled to the outer surface of the first outer diameter part 41 of the drive shaft 40 by hot pressing to maintain a firm coupling.

After the first and second inner bearings 54 and 55 are installed, the first and second inner bearings 37 are connected to each other in a state in which the outer bearing 57 is installed outside the connecting member 37. 54, 55) on the outside. The inner ring of the outer bearing 57 may also be firmly coupled to the outer surface of the connecting member 37 by being coupled to the outer surface of the connecting member 37 by hot pressing.

After the connection member 37 is installed, the rear bevel gear 34 and the connection member 37 are connected by fastening the plurality of fixing bolts 34a. In this case, the rear bevel gear 34 and the connection member 37 may be connected to each other since the fastening tool may enter through the rear opening of the gear chamber 32. In addition, the degree of biting of the plurality of inverted bevel gears 35 and the rear bevel gears 34 can be appropriately adjusted by adjusting the position of the rear bevel gear 34 or the position of the connecting member 37 slightly.

After the connection between the connecting member 37 and the rear bevel gear 34 and the position of the connecting member 37 is determined, the support ring 56c is installed at the rear end of the connecting member 37. That is, the support ring 56c is installed to support the second inner bearing 55 not to be separated from the engaged position. After installing the support ring 56c, the cover member 51 is installed between the outer ring 57 outer ring and the hull aft end 3 to close the rear opening of the gear chamber 32. That is, the first cover member 52 and the second cover member 53 are sequentially mounted to close the rear opening of the gear chamber 32.

After the reverse rotation device 30 is installed in this way, as shown in FIGS. 1 and 2, the front propeller 10, the rear propeller 20, and related components are mounted on the drive shaft 40. In this process, a plurality of fixing bolts 37a are fastened to connect the rear end of the connecting member 37 and the hub 11 of the front propeller 10. After the front and rear propellers 10 and 20 are installed, the installation may be completed by mounting the first sealing device 90 and the second sealing device 110.

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

When the driving shaft 40 is rotated by the operation of the inner drive source 4 of the hull 1, the propulsion device rotates together with the rear propeller 20 directly connected to the rear end of the driving shaft 40 in the same direction as the driving shaft 40. . At the same time, the drive bevel gear 33 of the reverse rotation device 30 is also fixed to the drive shaft 40 and rotates together with the drive shaft 40. Since the rotation of the driving bevel gear 33 is inverted by the plurality of inversion bevel gears 35 and transferred to the driven bevel gear 34, the driven bevel gear 34 rotates opposite to the drive shaft 40. Therefore, the front propeller 10 connected by the driven bevel gear 34 and the connecting member 37 rotates in the direction opposite to the rear propeller 20.

The forward propeller 10 and the rear propeller 20, which rotate in opposite directions, generate propelling water in the same direction because their blade angles are opposite to each other. In other words, when the ship moves forward, the propulsion water is generated backward, and when the ship is backward, the propulsion water is generated forward while rotating in the reverse direction. The propulsion water generated when moving forward recovers the rotational energy of the fluid passing through the front propeller 10 as the propulsion force while the rear propeller 20 rotates in the reverse direction, thereby improving the propulsion performance. The same goes for backward.

On the other hand, since the forward propeller 10 generates propelling water backward when it is advanced, it receives a reaction force corresponding thereto. This force is transmitted to the drive shaft 40 through the front thrust bearing 72 acts as a driving force. The rear propeller 20 also receives a reaction force because it generates a propulsion flow rearward, and this force is also transmitted to the drive shaft 40 directly connected to act as a driving force.

When the ship is retracted, the propulsion force of the front propeller 10 is transmitted to the drive shaft 40 through the rear thrust bearing 73, and the propulsion force of the rear propeller 20 is also transmitted to the directly connected drive shaft 40. As a result, the propulsion device of the present embodiment is transmitted to the hull 1 through the drive shaft 40, both the driving force generated by the operation of the front propeller 10 and the rear propeller 20 when the ship is moving forward and backward.

1: hull, 4: driving source,
3: rear of hull, 10: forward propeller,
20: rear propeller, 30: reverse rotation device,
32: gear chamber, 33: drive bevel gear,
34: driven bevel gear, 35: reverse bevel gear,
37: connecting member, 40: drive shaft,
52: first cover member, 52: second cover member,
54: first inner bearing, 55: second inner bearing,
57: outer bearing, 71: radial bearing,
72: front thrust bearing, 73: rear thrust bearing,
80: support ring, 90: first sealing device,
110: Second sealing device.

Claims (6)

Rear propeller fixed to the drive shaft,
A front propeller rotatably supported by the drive shaft in front of the rear propeller;
Is installed on the rear side of the hull and includes a reverse rotation device for transmitting the reverse of the rotation of the drive shaft to the front propeller,
The reverse rotation device may include a drive bevel gear fixed to the drive shaft, a driven bevel gear rotatably supported around the drive shaft, one or more inverted bevel gears for inverting and transmitting rotation of the drive bevel gear, and the A cylindrical connecting member installed outside the drive shaft and connecting the driven bevel gear and the hub of the front propeller, an inner bearing installed between the inner surface of the connecting member and the outer surface of the driving shaft to rotatably support the connecting member, the connecting member Ship propulsion device comprising an outer bearing rotatably supporting the outer surface of the. The method of claim 1,
The driving bevel gear, the driven bevel gear, and the inverted bevel gear are accommodated in a gear chamber having a rear surface open at the rear side of the hull,
The reverse rotation apparatus further includes a cover member installed between the outer bearing and the hull rear to close the rear opening of the gear chamber. 3. The method of claim 2,
The inner bearing includes a first inner bearing and a second inner bearing disposed to be spaced apart from each other,
The reverse rotation device is interposed between the inner ring of the first inner bearing and the inner ring of the second inner bearing to support them, an inner support ring interposed between the outer ring of the first inner bearing and the outer ring of the second inner bearing, A ship propulsion device including an outer support ring for supporting, a support ring installed at an end side of the connection member coupled to the hub of the front propeller to support the second inner bearing. A ship equipped with the propulsion device according to any one of claims 1 to 3. In the installation method of the ship propulsion device according to claim 3,
Installing the driving bevel gear and the reverse bevel gear in the gear chamber;
Installing the first inner bearing on an outer surface of the drive shaft in a state where the driven bevel gear is introduced into the gear chamber after the driving and reversing bevel gears are installed;
Installing the second inner bearing after installing the inner and outer support rings on the outer surface of the drive shaft;
Installing the outer side bearings on the outer side of the connecting member and installing the outer side members on the first and second inner bearings;
Connecting the rear bevel gear and the connecting member;
Installing the support ring on the connection member to support the second inner bearing;
The installation method of the ship propulsion device comprising the step of connecting the hub of the connection member and the front propeller. The method of claim 5,
And a step of closing the rear opening of the gear chamber by installing the cover member before connecting the connection member and the front propeller.

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