KR101313605B1 - Propulsion apparatus for ship and ship having the same - Google Patents

Abstract

Marine propulsion device is disclosed. Ship propulsion device according to one side is provided on at least one of the front propeller and rear propeller, the front propeller and the rear propeller installed to rotate in the opposite direction to the drive shaft rotated by the drive source to solve the eccentric force during the eccentric rotation of the drive shaft It includes a balancer device, the balancer device includes a mass and an annular race movably receiving the mass, and the mass moves along the race in a direction to solve the eccentric force during the eccentric rotation of the drive shaft.

Description

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

The present invention relates to a ship propulsion device for generating a propulsion force of the ship and a ship having the same.

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. The propulsion device includes a drive shaft system rotated by a drive source and a propeller coupled to the drive shaft system.

Drive shaft system generates vibration by pulsation of transmission torque, natural vibration of shaft system and propeller, and excessive vibration causes damage and fatigue destruction of shaft system or related parts. Being .

On the other hand, the propeller equipped with one propeller is not able to use the rotational energy of the water flow as a propulsion force, the energy loss is large, and the lost rotation energy can be recovered as the propulsion force, the counter rotating propeller (CRP) There is.

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 exert a high propulsion performance in comparison with a propulsion device equipped with one 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. As the double reversal propulsion device becomes more complicated, the vibration generated in the drive shaft system becomes more and more important.

In addition, since the double reversal propulsion device has a hollow outer shaft extending long from the reverse rotation device to the hull rear, it is very difficult to align the center of the inner shaft and the outer shaft when installed in 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 present embodiment intends 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.

In addition, the present embodiment is to provide a ship propulsion apparatus and a ship having the same that can quickly reduce the vibration generated in the drive shaft.

Ship propulsion apparatus according to an aspect of the present invention is a front propeller and a rear propeller is installed to rotate in a direction opposite to each other on the drive shaft rotated by a drive source; A balancer device provided in at least one of the front propeller and the rear propeller to remove the eccentric force during eccentric rotation of the drive shaft, wherein the balancer device includes a mass body and an annular race movably accommodating the mass body. It includes, the mass can move along the race in a direction to solve the eccentric force during the eccentric rotation of the drive shaft.

In addition, the balancer device may include a balancer housing in which the race is partitioned therein, and a viscous fluid accommodated in the race.

In addition, the mass may have a spherical shape.

In addition, the balancer device may be provided on at least one of a hub of the front propeller and a hub of the rear propeller, and the balancer housing may be coupled to at least one of a hub rear surface of the front propeller and a hub rear surface of the rear propeller. have.

In addition, the rear propeller is fixed to the drive shaft, the front propeller is coupled to the drive shaft in front of the rear propeller so as to be relatively rotatable, and directly connected to the front propeller so as to transfer the rotation of the drive shaft to the front propeller ( It may further include a reverse rotation device that is direct.

In addition, the reverse rotation device may be provided with a plurality of bevel gears, one of the plurality of bevel gears may be fixed to the hub of the front propeller.

In addition, the inversion rotating device is 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 for inverting and transmitting the rotation of the drive bevel gear to the driven bevel gear. It may include a gear.

According to another aspect of the present invention is coupled to the drive shaft rotated by the drive source propeller generating a propulsion force; A balancer device provided in the hub of the propeller to remove the eccentric force during the eccentric rotation of the drive shaft, the balancer device including a mass and an annular race movably receiving the mass; When the eccentric rotation of the drive shaft can be moved along the race in the direction to solve the eccentric force.

In addition, the balancer device may include a balancer housing in which the race is partitioned therein, and a viscous fluid accommodated in the race.

In addition, the mass may have a spherical shape.

In addition, the balancer device may be provided in the hub of the propeller, and the balancer housing may be coupled to the hub rear surface of the propeller.

In the propulsion device of this embodiment, since the inversion rotating device is constituted by a plurality of bevel gears and the volume thereof can be reduced, it is possible to install the inversion rotating device in the rear of the hull.

In addition, since the propeller of the present embodiment can directly connect the bevel gear and the front propeller of the reverse rotation device, it is possible to transmit the power to the forward propeller without using the outer shaft unlike the prior art, .

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

In addition, the propulsion device of the present embodiment can easily install the propulsion device because the propulsion device can be installed from behind the hull to the installation space provided at the rear of the hull.

In addition, since the propulsion device of the present embodiment does not use an outer shaft, it is possible to reduce an area requiring lubrication, and to minimize all problems caused by lubrication.

In addition, the propulsion device of the present embodiment can improve the bite reliability of the gears of the reverse rotation device by reducing the vibration generated by the main shaft through the balancer device.

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.
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.
8 is a cross-sectional view of a balancer device according to an embodiment of the present invention.
9 is an operational state diagram of a balancer device according to an embodiment of the present invention.
10 is a sectional view of the first sealing device of the propulsion device according to the embodiment of the present invention.
11 is an exploded perspective view of the first sealing device of the propulsion device according to the embodiment of the present invention.
12 is a sectional view of the second sealing device of the propulsion device according to the embodiment of the present invention.
13 is a modified example of the reverse rotation device of the propulsion apparatus according to the present embodiment.

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

1 to 3, the propulsion device for a ship according to the present embodiment is installed in the rear end 3 of the hull 1, and the two inverting propellers 20, Propulsion system. The rear end 3 of the hull 1 means a streamlined stern boss protruding rearward from the stern portion of the hull 1 so as to support the drive shaft 10 provided with the two propellers 20 and 30 do.

The propulsion device includes a drive shaft 10 extending out of the ship through the rear end 3 of the hull 1 and a rear propeller 20 fixed to the end of the drive shaft 10 and integrally rotated with the drive shaft 10. And, the front propeller 30 and the front propeller 30, which is installed to be relatively rotatable to the drive shaft 10 from the front of the rear propeller 20, and receives the rotational force of the drive shaft 10 to rotate the front propeller 30 of the rear propeller 20 It may include a reverse rotation device 70 that is directly connected to the front propeller 30 to rotate in a direction opposite to the direction.

The drive shaft 10 is connected to a drive source 2 (a diesel engine, a gasoline engine, a motor, a turbine or the like) installed in the ship and is extended outboard from the rear end 3 of the hull 1, .

The stepped portions 12 and 13 for installing the reverse rotation device 70 and the forward propeller 30 and the tapered portion 14 for installing the rear propeller 20 are sequentially As shown in FIG. A flange portion 11 extending outward in the radial direction of the drive shaft 10 may be provided on the stepped portion 12 where the reverse rotation device 70 is installed.

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, 23 are pressed into the tapered portion 14 of the drive shaft 10 and then supported by the fixing nut 24 so that the rear propeller 20 can be fixed to the drive shaft 10. [

On the other hand, the balancer device 130 may be provided on the rear surface of the hub 21 of the rear propeller 20 to reduce the vibration generated by the drive shaft 10. A detailed description of the balancer device 130 will be described later.

Reference numeral 25 denotes a propeller cap which is mounted so as to cover the rear end of the drive shaft 10.

The front propeller 30 is installed to be relatively rotatable on the outer surface of the drive shaft 10 at the front spaced apart from the rear propeller 20 by a predetermined distance. The front propeller 30 is supported by the radial bearing 51 and the front and rear thrust bearings 52 and 53, and the hub 31 and the hub which are rotatably supported on the outer surface of the drive shaft 10. 31, a plurality of wings 32 provided on the outer surface.

The front thrust bearing 52 is supported by the front bearing support 33 of the hub 31 and the outer ring can be supported by the inner ring on the jaws of the second step 13 of the drive shaft 10. [

The rear thrust bearing 53 is supported so that the inner ring is not pushed in the axial direction by the support ring 60 mounted on the outer surface of the drive shaft 10, and the outer ring may be supported by the rear bearing support 34 of the hub 31. have.

 The radial bearing 51 bears 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, 53 are in the front and rear axial directions with the drive shaft 10. It is to be able to bear the thrust load acting on each. 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 split on both sides to form a semicircle, and engagement bolts 63 for fastening them, Lt; / RTI > As shown in FIG. 5, the front propeller 30 and the rear thrust bearing 53 are installed on the drive shaft 10, and then the drive shaft 10 is press-fitted to the hub 21 of the rear propeller 20. It is to be able to install the support ring 60 between the hub 21 and the rear thrust bearing 53 of the rear propeller 20 in a coupled 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 support ring 60 is installed between the rear thrust bearing 53 and the rear propeller hub 21 It is difficult to keep the gap accurately. Accordingly, after assembling the rear propeller 20 first, the distance between the rear thrust bearing 53 and the hub 21 of the rear propeller 20 is measured and a support ring 60 is manufactured to meet the driving shaft 10. By mounting on it, it is possible to realize accurate coupling. 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 .

2 and 3, the inversion device 70 may be installed between the hub 31 of the front propeller 30 and the rear end 3 of the hull 1. To this end, the rear end 3 of the hull 1 is provided with an installation space 4 of a concave shape capable of accommodating the reversing device 70.

The installation space 4 may be provided in a cylindrical shape whose center coincides with the center of the drive shaft 10 and is open at a portion facing the hub 31 of the front propeller 30.

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 and a drive bevel gear 71 fixed to the front bevel gear 71 A driven bevel gear 72 fixed to the front of the hub 31 of the drive bevel gear 71 and a plurality of inverted bevel gears 73 for transmitting the rotation of the driven bevel gear 71 to the driven bevel gear 72, have.

And a cylindrical casing 75 provided so as to surround the outside of the inverted bevel gear 73 so as to support the plurality of inverted bevel gear shafts 74.

 The driving bevel gear 71 can be fixed to the flange portion 11 by fastening a plurality of fixing bolts 71a while being supported by the first step portion 12 of the flange portion 11. [

The driven bevel gear 72 can also be 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 hub 31 of the front propeller 3.

Also, the driven bevel gear 72 may be spaced apart from the outer surface of the drive shaft 10 so that the inner diameter portion of the driven bevel gear 72 may not generate friction during rotation. 2 shows the manner in which the driven bevel gear 72 is engaged by the fastening bolts 72a, but the driven bevel gear 72 is welded to the hub 31 of the forward propeller 30 or the front propeller 30, The hub 31 may be integrally formed.

The plurality of inverted bevel gears 73 are interposed between the driving bevel gears 71 and the driven bevel gears 72 in a decoupled state, 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, if the inverted bevel gears 73 are capable of reversing the rotation of the driven bevel gears 71 and transmitting them to the driven bevel gears 72 It does not necessarily have 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, at least one coupling rail 76, which is elongated in the axial direction of the drive shaft 10 and protruded from the outer surface thereof, is installed on the outer surface of the casing 75 to guide the installation and limit the rotation of the casing 75 after installation do. In addition, the inner surface of the installation space 4 is provided with a coupling groove 77 to which the coupling rail 76 can be correspondingly coupled. 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.

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 bearing provided between the outer surface of the drive shaft 10 and the hull (1) adjacent to the reverse rotation device 70 to support the drive shaft (10) 55 may be provided. This radial bearing 55 contributes to realizing smooth operation of the inversion rotating device 70 by supporting the drive shaft 10 immediately before the inversion rotating device. That is to say, the radial bearing 55 prevents the radial vibration or fluctuation 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 73, (72) can be accurately maintained.

In addition, in the present embodiment, a balancer device 130 may be provided to reduce the vibration generated by the drive shaft 10 so that the bite between the bevel gears 71, 72, 73 is maintained accurately.

The balancer device 130 is coupled to the hub 21 of the rear propeller 20 as shown in FIGS. 2 and 3 to perform a function for rapidly reducing vibration of the drive shaft 10.

The balancer device 130 is to stabilize the rotational movement of the drive shaft 10 by moving in the direction opposite to the eccentric region when the eccentric rotation of the drive shaft 10 is generated, as shown in FIG. The housing 131 may include a plurality of masses 133 moving along the circumferential direction.

The balancer housing 131 is formed in a ring shape and is provided with an annular lace 135 in which a plurality of mass bodies 133 are movable therein, and has a predetermined viscosity inside the race 135. Viscous fluid 137 may be provided in a predetermined space filled form. In addition, the plurality of masses 133 may be provided in a spherical shape.

As shown in FIG. 9, when the unbalanced load F acts on the drive shaft 10 and the drive shaft 10 is eccentrically rotated, the mass 133 has an unbalanced load of the drive shaft 10 within the race 135. As it is moved to a position that can be offset to quickly offset the unbalanced load of the drive shaft 10 to induce a stable rotational balance of the drive shaft (10).

That is, even when an eccentric force is applied to the drive shaft 10 which is integrally rotated with the rear propeller 20 by the hydrodynamic action of the propeller side operating in the unbalance of the propeller itself or the uneven return of the stern portion, the balancer housing ( The mass body 133 embedded in the 131 is moved in a direction to solve the eccentric force, so that the drive shaft 10 maintains a stable rotational balance, so that a foreign body is separated between the driving bevel gear 71 and the inverted bevel gear 73. And the debris between the reverse bevel gear 73 and the driven bevel gear 72 is accurately maintained to increase the gear stability of the reverse rotation device (70).

On the other hand, the mass body 133 of the present embodiment is made to have a spherical shape, but if the mass body 133 can be moved in the direction to cancel the eccentric force is not limited in the form, the same also in the number of mass body 133.

In addition, the balancer device 130 of the present embodiment is provided to be mounted on the hub 21 of the rear propeller 20, but is mounted on the hub 31 of the front propeller 30, or the front and rear propellers (20, 30) It may be mounted to both of the hub (21, 31).

2, the propulsion device of the present embodiment includes a first sealing device 90 (see FIG. 2) that seals between the rear hull 3 and the front propeller hub 31 to prevent intrusion of seawater 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, and 93c. The flow path 95 may be provided with a flow path for supplying 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 having both sides divided in semicircular shapes so that the first lining 91 can 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 can be fastened to the flange 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 which 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.

13 is a modified example of the reverse rotation apparatus according to the present embodiment. In the example of FIG. 13, the gap adjusting member 72c is provided between the driven bevel gear 72 and the hub 31 of the front propeller 30. This is because the interval adjusting member 72c is capable of mediating the connection between the driven bevel gear 72 and the hub 31 of the front propeller 30 and the installation environment of the reverse rotation device 70 and the front propeller 30 The interval adjusting member 72c may be provided to adjust the distance between the hub 31 and the driven bevel gear 72. [

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

When the drive shaft 10 rotates due to the operation of the internal drive source 2 of the hull 1, the propulsion device is constructed so that the rear propeller 20 directly connected to the rear end of the drive shaft 10 moves together with the drive shaft 10 Rotate. 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.

On the other hand, even if due to the vibration generated by the drive shaft (10) integrally rotated with the rear propeller (20) by the hydrodynamic action of the propeller side operating in the unbalance of the propeller itself or the non-uniform back flow of the stern portion of the present embodiment The balancer device 130 quickly reduces the vibration of the drive shaft 10 to maintain a stable rotational balance of the drive shaft 10, thereby improving the reliability by accurately maintaining the gear bite of the reverse rotation device 70. It becomes possible.

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,
51,55: Radial bearing, 52: Front thrust bearing,
53: rear thrust bearing, 60: support ring,
70: reverse rotation device, 71: drive bevel gear,
72: driven bevel gear, 73: reverse bevel gear,
75: casing, 90: first sealing device,
110: Second sealing device. 130: balancer device,
131: balancer housing, 133: mass,
135: lace, 137: viscous fluid.

Claims (12)

A front propeller and a rear propeller installed on the drive shaft rotated by the drive source in opposite directions;
It is provided on at least one of the front propeller and the rear propeller includes a balancer device for releasing the eccentric force during the eccentric rotation of the drive shaft,
The balancer device includes a mass body and an annular race movably receiving the mass body, wherein the mass body moves along the race in a direction to solve the eccentric force during eccentric rotation of the drive shaft. The method of claim 1,
The balancer device includes a balancer housing in which the race is partitioned therein and a viscous fluid accommodated in the race. The method of claim 2,
The mass propulsion device for ships, characterized in that having a spherical shape. The method of claim 2,
The balancer device is provided on at least one of the hub of the front propeller and the hub of the rear propeller, wherein the balancer housing is coupled to at least one of the hub rear surface of the front propeller and the hub rear surface of the rear propeller. Marine propulsion unit. The method of claim 1,
The rear propeller is fixed to the drive shaft, and the front propeller is coupled to the drive shaft in front of the rear propeller so as to be relatively rotatable, and is directly connected to the front propeller to invert and transmit the rotation of the drive shaft to the front propeller. Ship propulsion device further comprising a reverse rotation device. 6. The method of claim 5,
The reverse rotation device is provided with a plurality of bevel gears, one of the plurality of bevel gears propulsion apparatus for a ship, characterized in that fixed to the hub of the front propeller. 6. The method of claim 5,
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 which inverts and rotates the rotation of the driving bevel gear to the driven bevel gear. Marine propulsion device comprising. A propeller coupled to a drive shaft rotated by a drive source to generate a propulsion force;
It is provided on the hub of the propeller includes a balancer device for releasing the eccentric force during the eccentric rotation of the drive shaft,
The balancer device includes a mass body and an annular race movably receiving the mass body, wherein the mass body moves along the race in a direction to solve the eccentric force during the eccentric rotation of the drive shaft. The method of claim 8,
The balancer device includes a balancer housing in which the race is partitioned therein and a viscous fluid accommodated in the race. The method of claim 9,
The mass propulsion device for ships, characterized in that having a spherical shape. The method of claim 9,
The balancer device is provided in the hub of the propeller, the balancer housing is a marine propulsion device, characterized in that coupled to the hub rear of the propeller. A ship equipped with a propulsion device according to any one of claims 1 to 11.

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