KR101324963B1 - Propulsion apparatus for ship and ship having the same - Google Patents

Abstract

Marine propulsion device is disclosed. The propulsion device for ship according to the present embodiment extends in an axial direction therein and includes a drive shaft having a lubricating oil supply passage having an open end thereof, a rear propeller fixed to the drive shaft, and a relative rotation to the drive shaft in front of the rear propeller. And a propeller cap covering the end of the drive shaft and communicating with the lubricating oil supply passage to form a flow space of lubricating oil therein, and a sealing device for sealing between the front propeller hub and the rear propeller hub. And a lubricating oil transfer hole formed through the rear propeller hub and guiding the lubricating oil in the flow space of the lubricating oil partitioned by the propeller cap to the sealing device.

Description

Ship propulsion device and ship equipped with the ship {PROPULSION APPARATUS FOR SHIP AND SHIP HAVING THE SAME}

The present invention relates to a propulsion device for a ship in which two propellers rotate in opposite directions and generate propulsion 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 exert a high propulsion performance in comparison with a propulsion device equipped with one propeller.

The double reversing propulsion device includes 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 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 marine propulsion apparatus having a simple lubricating oil supply structure and a vessel having the same.

According to an aspect of the present invention, there is provided a ship propulsion device extending along an axial direction therein and including a drive shaft having a lubricating oil supply passage having an open end thereof, a rear propeller fixed to the drive shaft, and a drive shaft in front of the rear propeller. A front propeller rotatably installed, a propeller cap covering an end of the drive shaft and communicating with the lubricating oil supply passage to form a flow space for lubricating oil therein; a seal for sealing between the front propeller hub and the rear propeller hub And a lubricating oil conveying hole formed through the rear propeller hub and guiding the lubricating oil in the flow space of the lubricating oil partitioned by the propeller cap to the sealing device.

The apparatus may further include a lubricating oil chamber formed between the sealing device and the driving shaft, and one end of the lubricating oil transfer hole may communicate with the lubricating oil chamber.

The sealing device may further include a lining installed at a front side of the rear propeller hub and a sealing member installed at a rear side of the front propeller hub to maintain a seal in contact with the lining. It may further include a connection channel to guide to.

The apparatus may further include a reverse rotation device for inverting and transmitting the rotation of the drive shaft to the front propeller, wherein the reverse rotation device may be directly connected to the hub of the front propeller.

The apparatus may further include a reverse rotation device having a drive gear fixed to the drive shaft, a driven gear fixed to the hub of the front propeller, and one or more inverted gears for inverting and transmitting the rotation of the drive gear. Can be.

In addition, a front thrust bearing and a rear thrust bearing supported on both sides of the front propeller hub for transmitting the thrust generated by the front propeller, a reinforcing member coupled to the front of the rear propeller hub, the rear thrust bearing and the A support ring is installed on the drive shaft to be supported between the reinforcement members. The reinforcement member may include a through hole for communicating the lubricant transfer hole and the lubricant chamber.

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 than in the related art, and as a lubrication supply line is simplified, problems of lubrication can be minimized.

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 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.
Figure 10 shows the lubricating oil delivery path of the propulsion device according to an embodiment of the present invention.
11 is a sectional view of the second sealing device of the propulsion device according to the embodiment of the present invention.
12 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 outboard from the ship through a rear end 3 of the hull 1 and a rear propeller 20 fixed to an end portion of the drive shaft 10 and rotated integrally with the drive shaft 10, A front propeller 30 installed to be rotatable relative to the drive shaft 10 in front of the rear propeller 20 and a forward propeller 30 receiving the rotational force of the drive shaft 10 to rotate the rear propeller 20 And a reverse rotation device 70 directly connected to the front propeller 30 so as to rotate in a direction opposite to the direction of the rotation.

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. [

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 relative to the drive shaft (10) so as to be rotatable relative to the rear propeller (20) at a predetermined distance away from the rear propeller (20).

The front propeller 30 includes a hub 31 supported by the radial bearing 51 and the front and rear thrust bearings 52 and 53 to be rotatable relative to the drive shaft 10, And a plurality of vanes 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 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 have.

 The radial bearing 51 is adapted to bear 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 support the radial load of the front propeller 30, 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.

The thrust generated in the front propeller 30 is transmitted to the drive shaft 10 through the rear thrust bearing 53, the support ring 60 and the reinforcing member 43. [

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 >

5, after the front propeller 30 and the rear thruster bearing 53 are installed on the drive shaft 10, the hub 21 of the rear propeller 20 is inserted into the drive shaft 10 in a press- So that the support ring 60 can be installed between the hub 21 of the rear propeller 20 and the rear thrust bearing 53. [

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.

Therefore, after the rear propeller 20 is assembled first, the distance between the rear thrust bearing 53 and the hub 21 of the rear propeller 20 is measured, and the support ring 60 is manufactured to match the distance, So that accurate coupling can be realized.

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 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, 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.

An engaging groove 77 is formed on the inner surface of the mounting space 4 so that the engaging rail 76 can be engaged with the engaging rail 76.

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.

2, the propulsion device of the present embodiment includes a radial bearing (not shown) provided between the drive shaft 10 and the hull 1 adjacent to the inversion rotating device 70 for supporting the drive shaft 10 55).

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.

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.

8, the first sealing device 90 includes a cylindrical first lining 91 provided on the front surface of the front propeller hub 31, a first lining 91 contacting the outer surface of the first lining 91, And a cylindrical first sealing member 92 whose one end is fixed to the rear hull 3.

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, .

9, the first lining 91 includes a first member 91a divided into a semicircular shape on both sides so as to be mountable 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.

10 and 11, the second sealing device 110 includes a cylindrical second lining 111 installed on the front surface of the rear propeller hub 21 and a second lining so as to contact an outer surface of the second lining 111. (111) includes a cylindrical second sealing member 112 covering the outer surface and one end of which is fixed to the rear surface of the front propeller hub (31).

Like the first sealing member 92, the second sealing member 112 may also include a plurality of packings 113a, 113b, and 113c provided on the inner surface, and a flow path 115 for supplying a fluid to the grooves between the packings. have.

In addition, a second connection passage 123 communicating with the passage 115 of the second sealing member 112 may be formed in the reinforcing member 42 at the rear side of the front propeller hub 31.

The second connection passage 123 may communicate with an annular inner space formed between the second lining 111 and the support ring 60, that is, the lubricating oil chamber 122.

The lubricating oil in the lubricating oil chamber 122 flows into the grooves between the packings 113a, 113b, and 113c of the second sealing member 112 through the flow paths 123 and 115 while lubricating the adjacent rear thrust bearings 53. The packings 113a, 113b and 113c are pressed to form a sealing pressure of the contact surface between the packings 113a, 113b and 113c and the second lining 111.

The lubricating oil chamber 122 is connected to the lubricating oil supply passage 120 provided at the center of the driving shaft 10, and receives the lubricating oil delivered through the lubricating oil supply passage 120.

To this end, the lubricating oil supply passage 120 may extend along the axial direction of the drive shaft 10 and both ends may be provided to be opened. One open end of the lubricating oil supply passage 120 may be connected to a hydraulic line (not shown) to which the lubricating oil is transferred, and the other end may be in communication with the propeller cap 25 covering the rear end of the driving shaft 10. have. The hydraulic line is arranged inboard and connected to a hydraulic unit (not shown) for supplying lubricating oil.

In addition, the rear propeller hub 21 is provided with a lubricating oil conveying hole 21a which is formed to penetrate along the axial direction of the hub 21, and the lubricating oil conveying hole 21a has one end communicating with the propeller cap 25. The other end may be in communication with the lubricant chamber 122.

Meanwhile, in the present embodiment, a through hole 43a having one end connected to the lubricating oil transfer hole 21a and the other end connected to the lubricating oil chamber 122 is connected to the reinforcing member 43 provided on the front side of the rear propeller hub 21. Although the lubricating oil formed and delivered through the lubricating oil transfer hole 21a is configured to be delivered to the lubricating oil chamber 122 via the through hole 43a, when the reinforcing member 43 is not provided, the rear propeller hub 21 is provided. Lubricating oil transfer hole (21a) formed in may be configured to directly communicate with the lubricant chamber 122.

Through this configuration, the lubricating oil supplied through the lubricating oil supply passage 120 inside the drive shaft 10 is passed through the rear propeller hub 21 to the lubricating oil chamber 122 and the lubricating oil supplied to the lubricating oil chamber 122. Since the lubrication for the surrounding structure and the second sealing member 112 is supplied to press the packings (113a, 113b, 113c), the agent for sealing between the front propeller hub 31 and the rear propeller hub 21 The structure for supplying lubricating oil toward the two sealing device 110 is simplified.

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 And after the support ring 60 is installed.

12 is a modified example of the reverse rotation apparatus according to the present embodiment. In the example of FIG. 12, 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.

When the ship is retracted, the propulsive force (reaction force) of the front propeller 30 is transmitted to the drive shaft 10 through the rear thrust bearing 53, and the propulsion force of the rear propeller 20 is also transmitted to the directly connected drive shaft 10. As a result, the propulsion device of the present embodiment is transmitted to the hull 1 through the drive shaft 10, both the driving force generated by the operation of the front propeller 30 and the rear propeller 20 when the ship is moving forward and backward.

1: hull, 2: driving source,
3: rear of hull, 4: installation space,
10: drive shaft, 20: rear propeller,
21: lubricant feed hole, 30: front propeller,
41, 42: reinforcing member, 43a: through hole,
51,55: Radial bearing, 52: Front thrust bearing,
53: rear thrust bearing, 60: support ring,
60a: support ring communication hole, 70: reverse rotation device,
71: driven bevel gear, 72: driven bevel gear,
73: inverted bevel gear, 75: casing,
90: first sealing device, 110: second sealing device.
120: lubricating oil supply passage,

Claims (7)

A drive shaft having a lubricating oil supply passage extending in an axial direction therein and having an open end;
A rear propeller fixed to the drive shaft,
A front propeller installed to be rotatable relative to the drive shaft in front of the rear propeller,
A propeller cap covering an end portion of the drive shaft and communicating with the lubricating oil supply passage to form a flow space of lubricating oil therein;
A sealing device for sealing between the front propeller hub and the rear propeller hub;
And a lubricating oil transfer hole formed through the rear propeller hub and guiding lubricating oil in the flow space of the lubricating oil partitioned by the propeller cap to the sealing device. The method of claim 1,
Further comprising a lubricating oil chamber formed between the sealing device and the drive shaft,
The lubricating oil transfer hole is a ship propulsion device one end is in communication with the lubricating oil chamber. 3. The method of claim 2,
The sealing device includes a lining installed at the front of the rear propeller hub, and a sealing member installed at the rear of the front propeller hub to keep the sealing in contact with the lining,
And a connection passage for guiding the lubricating oil of the lubricating oil chamber to the sealing member. The method of claim 1,
And a reverse rotation device for inverting and transmitting the rotation of the drive shaft to the front propeller, wherein the reverse rotation device is directly connected to the hub of the front propeller. The method of claim 1,
And a reversing rotating device having a drive gear fixed to the drive shaft, a driven gear fixed to the hub of the front propeller, and one or more reversing gears for inverting and transmitting the rotation of the drive gear. Device. 4. The method according to claim 2 or 3,
A front thrust bearing and a rear thrust bearing supported on both sides of the front propeller hub to transmit thrust generated by the front propeller, a reinforcement member coupled to a front surface of the rear propeller hub, the rear thrust bearing and the reinforcement member Further comprising a support ring installed on the drive shaft to be supported between,
The reinforcing member is a marine propulsion device, characterized in that the through hole for communicating the lubricating oil transfer hole and the lubricating oil chamber is formed. A ship equipped with the propulsion device according to any one of claims 1 to 5.

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