CN116615615A - Tension maintaining unit of ship crawler belt device and crawler belt device with tension maintaining unit - Google Patents

Abstract

The invention discloses a tension maintaining unit of a ship crawler device and the ship crawler device with the same. The tension maintaining unit of the crawler belt device comprises: a first output portion connected to the first rotating member of the track body and having a first one-way bearing; a second output portion connected to a second rotating member of the track body and having a second one-way bearing; and a driving unit for transmitting power to the first output unit and the second output unit, wherein the first one-way bearing is free to rotate to prevent tension of a first power transmission member provided to the crawler body from being relaxed when the crawler body moves in the forward direction, the second one-way bearing is driven by power, and the second one-way bearing is free to rotate to prevent tension of the first power transmission member from being relaxed when the crawler body moves in the backward direction, and the first one-way bearing is driven by power.

Description

Tension maintaining unit of ship crawler belt device and crawler belt device with tension maintaining unit

Technical Field

The present invention relates to a crawler belt device for a ship, and more particularly, to a tension maintaining unit of a crawler belt device capable of preventing a crawler from falling off due to a failure in maintaining a crawler tension of the crawler belt device, and a crawler belt device having the same.

Background

In general, aquatic organisms such as barnacles, sea squirts, dragon worms (serpula), mediterranean mussels, freshwater mussels, green vegetables (green laver), and seaweeds, which inhabit in water, are attached to and grow on the surface of the hull of a ship, and various hazards occur.

For example, the frictional resistance with sea water increases due to the adhesion of organisms in water to the hull, the navigation speed of the ship decreases, and the fuel consumption increases, which is economically disadvantageous.

Previously, the following cleaning operations were generally used: the ship is moved and placed on a dock (dock) on land, and an operator directly sprays water through a high-pressure hose to remove attachments on the wall surface of the ship. This method requires a preparation step for moving the ship to be cleaned to the dock, and thus has a disadvantage of taking a long cleaning time and mobilizing a large number of operators.

Although it is possible to clean the bottom of the ship by a cleaning device without moving the ship, it takes a long time for a diver who is familiar with the underwater working environment to clean a large-scale ship, and it is difficult to secure a visual field, thereby increasing the difficulty of cleaning work.

In view of the problems that it is difficult to effectively remove attachments by an operator for cleaning the bottom of a ship and a large number of operators are required, a method of applying a coating material mixed with a highly toxic substance to prevent marine organisms from attaching and parasitic to the surface of the ship is disclosed.

This approach is prohibited by international authorities because it causes other problems that pollute the sea water and have a detrimental effect on other marine organisms, which destroy the ecosystem in the water. In addition, if toxicity decreases over time, the coating must be applied again after cleaning.

In view of the problems described above, a technique of removing deposits while moving the wall surface of the hull immersed in water by a cleaning robot is disclosed.

On the other hand, if the tension of the crawler belt (continuous track) is relaxed during the cleaning operation of the ship, the crawler belt is separated during running. The reason for the falling-off of the crawler belt is as follows. I) The tension of the crawler belt becomes loose; ii) the impurity flows into the space between the track section and the idler wheel (idle wheel); iii) The track section is not in the same straight line with the idler wheel, the chain wheel, the upper roller and the lower roller; iv) a case where the track joint runs in a non-horizontal state, and the like.

Further, the tension is relaxed by applying excessive force to the tensioner supporting the track section as follows. i) A case where the movement is hindered by an obstacle or an external force when the marine cleaning vehicle is retreated; ii) when the marine cleaning vehicle is rotating in situ, the crawler belt rotates in the backward direction.

Fig. 1 shows a case where the idler and the tensioner are integrally formed, and the crawler belt is loosened.

Sprocket 1000 is disposed on the right side with reference to fig. 1, and right side portions of track segments 1100 are supported by sprocket 1000 and the other side portions are supported by idler 1200. Further, the upper and lower portions of the track segments 1100 are supported by four roller members 1300.

As shown in fig. 1 (a), the track is maintained taut in the case where the track advances, i.e., the track segments 1100 rotate in a counterclockwise direction.

In contrast, as shown in fig. 1 (b), when the crawler belt is retracted, if the movement is hindered by an obstacle or an external force during the retraction, a force is applied to the tensioner and the region of the crawler belt that is in contact with the ground becomes loose.

Fig. 2 shows a case where the crawler belt is loosened in a case where the idler pulley and the tensioner are provided separately.

As shown in fig. 2 (a), in the case where the track advances, i.e., the track segment 1100 rotates in the counterclockwise direction, the track is maintained taut.

In contrast, as shown in fig. 2 (b), when the crawler belt retreats, if the movement is hindered by an obstacle or an external force during the retreating, a force is applied to the tensioner 1400 and the region of the crawler belt that is in contact with the ground is loosened.

The above-described technical structure is background art for aiding understanding of the present invention, and is not intended to mean conventional technology widely known in the technical field to which the present invention pertains.

(prior art literature)

(patent literature)

(patent document 1) Korean patent publication No. 10-1069916 (Sanxingjingjingshi Co., ltd., 2011, 9, 27 days)

Disclosure of Invention

[ technical problem ]

As shown in fig. 3, in order to prevent the slack of the crawler belt, the idler wheel at the front is changed to a sprocket to transmit power, and the front and rear sprockets are rotated at the same rotation number, the tension of the portion of the crawler belt section in contact with the lower roller member during movement can be relaxed or tightened without being affected by the tensioner.

In order to tighten the crawler belt in contact with the lower part, the power of the front sprocket is cut off during the forward movement to freely move the front sprocket and transmit the power to the rear sprocket. When the rear sprocket is retracted, the power of the rear sprocket is cut off to freely move the rear sprocket, and the power is transmitted to the front sprocket.

Accordingly, an object of the present invention is to provide a tension maintaining unit for a crawler belt device capable of preventing a crawler belt from falling off due to failure in maintaining tension of the crawler belt device by using the above principle, and a crawler belt device having the same.

[ means for solving the problems ]

According to an aspect of the present invention, there may be provided a tension maintaining unit of a crawler belt apparatus for a watercraft, the tension maintaining unit including: a first output portion connected to the first rotating member of the track body and having a first one-way bearing; a second output connected to a second rotating member of the track body and having a second one-way bearing; and a driving unit configured to transmit power to the first output unit and the second output unit, wherein the first one-way bearing is configured to be rotated freely to prevent tension of a first power transmission member provided to the crawler body from being relaxed when the crawler body moves in a forward direction, the second one-way bearing is configured to be driven by power, and the second one-way bearing is configured to be rotated freely to prevent tension of the first power transmission member from being relaxed when the crawler body moves in a backward direction, and the first one-way bearing is configured to be driven by power.

The first output part may include: a first link coupled to the first rotating member; the first one-way bearing is combined to the first connecting piece; and a first pulley having one side coupled to the first one-way bearing and the other side coupled to the second power transmission member and rotating together with the second power transmission member.

The second output part may include: a second link coupled to the second rotating member; the second one-way bearing is combined to the second connecting piece; and a second pulley having one side coupled to the second one-way bearing and the other side coupled to the second power transmission member and rotating together with the second power transmission member.

The tension maintaining unit may further include: and a pair of idler gears disposed above the first output unit and the second output unit, and pressurizing a region of the second power transmission member connecting the first output unit and the driving unit and a region of the second power transmission member connecting the second output unit and the driving unit.

The driving parts may be provided in a pair and connected to the first output part and the second output part, respectively.

One side portion of the first one-way bearing may be directly coupled to the first rotating member and the other side portion may be directly coupled to the driving portion, one side portion of the second one-way bearing may be directly coupled to the second rotating member and the other side portion may be directly coupled to the driving portion, and the driving portion may be provided as a pair and coupled to the first one-way bearing and the second one-way bearing, respectively.

The first and second rotating members may be provided as sprockets.

The first power transmission member may include a track section, and the second power transmission member connecting the first output portion, the second output portion, and the driving portion may include a belt.

May further comprise: and a tension maintaining tensioner for supporting a region of the second power transmission member connecting the first output portion and the second output portion.

In addition, according to another aspect of the present invention, there may be provided a crawler belt apparatus for a watercraft, including: a crawler belt body having a first rotating member that supports one side portion of a first power transmission member and rotates together with the first power transmission member, and a second rotating member that is disposed apart from the first rotating member and supports the other side portion of the first power transmission member; and a tension maintaining unit having a first output portion connected to the first rotating member and having a first one-way bearing, a second output portion connected to the second rotating member and having a second one-way bearing, and a driving portion transmitting power to the first output portion and the second output portion, the first one-way bearing freely rotating to prevent tension relaxation of the first power transmitting member when the track body moves in a forward direction, and the second one-way bearing being driven by power, the second one-way bearing freely rotating to prevent tension relaxation of the first power transmitting member when the track body moves in a backward direction, and the first one-way bearing being driven by power.

May further comprise: and a tension maintaining tensioner for supporting a region of the second power transmission member connecting the first output portion and the second output portion.

[ Effect of the invention ]

In the embodiment of the invention, when the crawler body moves in the forward direction, the first one-way bearing freely rotates to prevent the tension of the first power transmission component arranged on the crawler body from loosening, and when the crawler body moves in the backward direction, the second one-way bearing freely rotates to prevent the tension of the first power transmission component from loosening, so that the crawler can be prevented from falling off due to failure of maintaining the tension of the crawler device.

Drawings

Fig. 1 is a view showing a case where the crawler belt becomes loose in a case where the idler pulley and the tensioner are provided as one body.

Fig. 2 is a view showing a case where the crawler belt becomes loose in a case where the idler pulley and the tensioner are provided separately.

Fig. 3 is a schematic view schematically showing a principle of preventing the crawler belt from becoming loose.

Fig. 4 is a view schematically showing a crawler belt apparatus for a watercraft according to an embodiment of the present invention.

Fig. 5 is an exploded perspective view of fig. 4.

Fig. 6 is an exploded perspective view of the first output portion and the second output portion shown in fig. 5.

Fig. 7 is a schematic front view of the tension maintaining unit shown in fig. 5.

Fig. 8 is an operation diagram of the tension maintaining unit shown in fig. 7.

Fig. 9 is another embodiment of the tension maintaining unit shown in fig. 5.

Fig. 10 is an exploded perspective view of fig. 9.

Fig. 11 is a further embodiment of the tension maintaining unit shown in fig. 5.

Fig. 12 is an exploded perspective view of fig. 11.

Fig. 13 is a view schematically showing the coupling of the first rotary member and the first one-way bearing shown in fig. 12 to the driving unit.

Detailed Description

For a full understanding of the invention and the advantages of its operation and objects attained by its practice, reference should be made to the drawings and to the accompanying descriptive matter in which there is illustrated preferred embodiments of the invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, so as to explain the present invention in detail. Like reference symbols in the various drawings indicate like elements.

Fig. 4 is a view schematically showing a crawler belt apparatus according to an embodiment of the present invention, fig. 5 is an exploded perspective view of fig. 4, fig. 6 is an exploded perspective view of the first output part and the second output part shown in fig. 5, fig. 7 is a schematic front view of the tension maintaining unit shown in fig. 5, and fig. 8 is an operation view of the tension maintaining unit shown in fig. 7.

Fig. 9 is another embodiment of the tension maintaining unit shown in fig. 5, fig. 10 is an exploded perspective view of fig. 9, fig. 11 is another embodiment of the tension maintaining unit shown in fig. 5, fig. 12 is an exploded perspective view of fig. 11, and fig. 13 is a view schematically showing the first rotary member and the first one-way bearing combined with the driving part shown in fig. 12.

As shown in these figures, the crawler belt device 1 according to the present embodiment has: a track body 100 coupled to the body of the ship cleaning device to be driven; and a tension maintaining unit 200 connected to the track body 100 and preventing the first power transmission member 110 provided to the track body 100 from becoming loose to maintain tension.

The track body 100 is coupled to the body of the ship cleaning device and can receive power from a power transmission device provided to the body, thereby moving the ship cleaning device forward or backward.

In the present embodiment, the track body 100 includes: a first power transmission member 110; the first rotation member 120, which is disposed in front of the first power transmission member 110, supports the first power transmission member 110 and rotates together with the first power transmission member 110; a second rotation member 130 disposed behind the first power transmission member 110, supporting the first power transmission member 110 and rotating together with the first power transmission member 110; a body tensioner 140 disposed above the first rotary member 120 and the second rotary member 130 and supporting an upper portion of the first power transmission member 110; and a plurality of roller members 150 disposed between the first and second rotating members 120 and 130 and supporting a lower portion of the first power transmission member 110.

The first power transmission member 110 of the track body 100 may include track segments. In the present embodiment, the first power transmission member 110 may fix the track shoe to a timing belt (timing belt) at a predetermined pitch.

As shown in fig. 4, the first and second rotating members 120 and 130 of the track body 100 may be provided as timing pulleys (timing pulleys). In the present embodiment, the first rotating member 120 and the second rotating member 130 may also be configured as sprockets.

As shown in fig. 4, the body tensioner 140 of the track body 100 may be sized larger than the pair of roller members 150 and support the first power transmission member 110. A pair of roller members 150 may be selectively used in the present embodiment.

As shown in fig. 4, the tension maintaining unit 200 is coupled to the track body 100, the front region functions as an idler when the track body 100 moves in the forward direction, and the rear region functions as an idler when the track body 100 moves in the backward direction, so that tension of the first power transmission member 100 can be prevented from becoming loose regardless of which direction the track body 100 moves.

As shown in fig. 5, the tension maintaining unit 200 in the present embodiment includes: a first output part 300 connected to the first rotating member 120 of the track body 100 and having a first one-way bearing 320; a second output part 400 connected to the second rotating part 130 of the track body 100 and having a second one-way bearing 420; a driving unit 500 that transmits power to the first output unit 300 and the second output unit 400; a second power transmission member 600 that connects the first output unit 300, the second output unit 400, and the driving unit 500; the tension maintaining tensioner 700 supports a region of the second power transmission member 600 where the first output part 300 and the second output part 400 are connected; and a pair of idler gears 800 disposed above the first output unit 300 and the second output unit 400, and pressurizing a region of the second power transmission member 600 connecting the first output unit 300 and the driving unit 500 and a region of the second power transmission member 600 connecting the second output unit 400 and the driving unit 500.

The first output part 300 is for freely rotating and preventing tension of the first power transmission member 110 provided to the track body 100 from being relaxed when the track body 100 moves in the advancing direction, and is detachably screwed to the first rotation member 120 by a plurality of fastening members 10 as shown in fig. 5.

As shown in fig. 5 and 6, in the present embodiment, the first output unit 300 includes: a first connector 310 coupled to the first rotating member 120 by a plurality of fastening members 10; a first one-way bearing 320 coupled to the first link 310; and a first pulley 330 having one side coupled to the first one-way bearing 320 and the other side coupled to the second power transmission member 600 and rotating together with the second power transmission member 600.

As shown in fig. 5, the first connector 310 of the first output part 300 includes: a first flange 311 coupled to the first rotating member 120 by a plurality of first grooves 311a and a plurality of fastening members 10; and a first body 312 provided to the first flange 311 and coupled to the first locking ring 321 of the first one-way bearing 320 by the plurality of pin members 20. In the present embodiment, the plurality of fastening members 10 may be detachably screwed into the plurality of first grooves 311a after passing through the plurality of holes provided in the first rotating member 120. In the present embodiment, a plurality of first coupling grooves 312a in which the pin members 20 are coupled are provided in the first body 312.

As shown in fig. 5, the first one-way bearing 320 of the first output part 300 includes: a first locking ring 321 coupled to the first body 312; a first rotating ring 322 rotatably coupled to an outer wall of the first locking ring 321; and a plurality of first ring grooves 323 provided on the inner wall of the first locking ring 321 and the outer wall of the first rotating ring 322 as shown in fig. 6 and providing fitting and coupling sites for pin members.

In the present embodiment, power may be transmitted to the first locking ring 321 when the first rotating ring 322 rotates in a specific direction, and power may not be transmitted to the first locking ring 321 when the first rotating ring 322 rotates in the opposite direction to the specific direction.

In the present embodiment, the first one-way bearing 320 may be installed in a direction to transmit a force in a clockwise direction as shown in fig. 8.

As shown in fig. 6, the first pulley 330 of the first output part 300 may be coupled to the outer wall of the first rotating ring 322 by a plurality of first pin grooves 331 provided at the inner wall and a plurality of pin members 20.

The second output part 400 is for freely rotating and preventing the tension of the first power transmission member 110 from being relaxed when the track body 100 moves in the backward direction, and as shown in fig. 5, can be detachably coupled to the second rotation member 130 by a plurality of fastening members 10.

As shown in fig. 5, in the present embodiment, the second output section 400 includes: a second link 410 coupled to the second rotating part 130; a second one-way bearing 420 coupled to the second link 410; and a second pulley 430 having one side coupled to the second one-way bearing 420 and the other side coupled to the second power transmission member 600 and rotated together with the second power transmission member 600.

As shown in fig. 5, the second connector 410 of the second output part 400 includes: a second flange 411 coupled to the second rotating member 130 by a plurality of second slots 411a and a plurality of fastening members 10; the second body 412 is provided to the second flange 411 and coupled to the second locking ring 421 of the second one-way bearing 420 by the plurality of pin members 20. In the present embodiment, the plurality of fastening members 10 may be detachably screwed to the plurality of second slots 411a after passing through the plurality of holes provided in the second rotating member 130. In the present embodiment, a plurality of second coupling grooves 412a to which the pin members 20 are coupled are provided in the second body 412.

As shown in fig. 5, the second one-way bearing 420 of the second output part 400 includes: a second locking ring 421 coupled to the second body 412; a second rotating ring 422 rotatably coupled to an outer wall of the second locking ring 421; and a plurality of second ring grooves 423 provided on the inner wall of the second locking ring 421 and the outer wall of the second rotating ring 422 as shown in fig. 6, and providing fitting and coupling places for the pin members.

In the present embodiment, power may be transmitted to the second locking ring 421 when the second rotating ring 422 rotates in a specific direction, and power may not be transmitted to the second locking ring 421 when the second rotating ring 422 rotates in the opposite direction to the specific direction.

In this embodiment, the second one-way bearing 420 may be installed in a direction to transmit the power in the counterclockwise direction as shown in fig. 8.

As shown in fig. 6, the second pulley 430 of the second output part 400 may be coupled to the outer wall of the second rotary ring 422 by a plurality of second pin grooves 431 provided at the inner wall and a plurality of pin members 20.

As shown in fig. 5, the driving part 500 may be connected to an upper central part of the second power transmission member 600 to provide power for rotating the second power transmission member 600.

In the present embodiment, the driving unit 500 includes a driving motor 510 and a driving pulley 520 as shown in fig. 5, and the driving pulley 520 is coupled to the shaft of the driving motor 510, rotates together with the shaft, and is engaged with the second power transmission member 600.

As shown in fig. 5, the inner wall of the second power transmission member 600 is engaged with the first pulley 330, the second pulley 430, and the driving pulley 520, and as shown in fig. 8, the second power transmission member 600 may be rotated in a clockwise or counterclockwise direction.

As shown in fig. 5, the upper outer wall of the second power transmission member 600 may be supported by a pair of idler gears 800 and the lower central outer wall may be supported by a tension maintaining tensioner 700 in the present embodiment.

In addition, in the present embodiment, the second power transmission member 600 may be provided in a belt form.

As shown in fig. 5, the tension maintaining tensioner 700 may support the lower central outer wall of the second power transmission member 600 and impart tension to the second power transmission member 600.

In this embodiment, the tension maintaining tensioner 700 may be coupled to the body of the watercraft cleaning apparatus by a shaft.

As shown in fig. 7, a pair of idle gears 800 may be disposed below the driving pulley 520 and support the upper outer wall of the second power transmission member 600.

Hereinafter, the operation of the tension maintaining unit 200 will be briefly described with reference to fig. 8.

First, power is transmitted when the crawler belt body 100 moves in the forward direction as follows.

The first pulley 330 and the second pulley 430 are rotated in the counterclockwise direction by the force of the driving motor 510 at the same rotation number. At this time, the first one-way bearing 320 transmits power only when receiving force in the clockwise direction. Therefore, the first output part 300 is free to rotate. In contrast, the second one-way bearing 420 transmits power only when receiving force in the counterclockwise direction. Therefore, power is transmitted to the second output unit 400.

Next, power is transmitted when the crawler belt body 100 moves in the backward direction as follows.

The first pulley 330 and the second pulley 430 are rotated in the clockwise direction by the force of the driving motor 510 at the same rotation number. At this time, the first one-way bearing 320 transmits power only when receiving force in the clockwise direction. Therefore, power is transmitted to the first output unit 300. In contrast, the second one-way bearing 420 transmits power only when receiving force in the counterclockwise direction. Therefore, the second output part 400 is free to rotate.

That is, the first rotating member 120 functions as an idler when the track body 100 moves in the forward direction, and the second rotating member 130 functions as an idler when the track body 100 moves in the backward direction. Accordingly, the tension of the first power transmission member 110 does not become relaxed regardless of the direction in which the track body 100 travels.

On the other hand, in the present embodiment, the tension maintaining unit 200a of the crawler belt apparatus 1a may be formed of only the first output unit 300, the second output unit 400, and the driving unit 500, as shown in fig. 10 and 11. At this time, the driving part 500 may be provided as a pair and connected to the first and second output parts 300 and 400, respectively, and transmit power independently of each other.

In this case, there are the following advantages: the second power transmission member 600, the tension maintaining tensioner 00, and the pair of idler gears 800 are not required, so that the structure is simple and the manufacturing cost can be reduced.

In addition, in the present embodiment, as shown in fig. 11 to 13b, the tension maintaining unit 200b of the crawler belt apparatus 1b may directly couple the first output part 300b to the first rotating member 120 using a plurality of pin members 20, and directly couple the second output part 400b to the second rotating member 130 using a plurality of pin members 20. At this time, as shown in fig. 12, the respective shafts of the pair of driving motors 510 of the driving part 500b may be coupled to the first and second locking rings 321 and 421, respectively, using a plurality of pin members 20.

As described above, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations are intended to be included within the scope of the claims of this invention.

Description of the reference numerals

1: ship track device

100: caterpillar body

110: first power transmission member

120: first rotary part

130: second rotary part

140: body tensioner

150: roller component

200. 200a, 200b: tension maintaining unit

300. 300b: a first output part

310: first connecting piece

311: a first flange

311a: first groove

312: a first main body

312a: first combining groove

320: first one-way bearing

321: first locking ring

322: first rotary ring

323: first ring groove

330: first belt pulley

331: first pin groove

400. 400b: a second output part

410: second connecting piece

411: second flange

411a: second groove

412: a second main body

412a: second combining groove

420: second one-way bearing

421: second locking ring

422: second rotary ring

423: second ring groove

430: second belt wheel

431: second pin groove

500. 500b: drive unit

510: driving motor

520: driving belt wheel

600: second power transmission member

700: tension maintaining tensioner

800: idler wheel

Claims (11)

1. A tension maintenance unit for a watercraft track apparatus, comprising:

a first output portion connected to the first rotating member of the track body and having a first one-way bearing;

a second output connected to a second rotating member of the track body and having a second one-way bearing; and

a driving unit for transmitting power to the first output unit and the second output unit,

the first one-way bearing is freely rotated to prevent tension of a first power transmission member provided to the track body from being relaxed when the track body is moved in the forward direction, and the second one-way bearing is driven by power,

the second one-way bearing is freely rotated to prevent tension of the first power transmission member from being relaxed when the track body moves in the backward direction, and the first one-way bearing is driven by power.

2. The tension maintaining unit of a crawler belt apparatus for a ship according to claim 1, wherein,

the first output section includes:

a first link coupled to the first rotating member;

the first one-way bearing is combined to the first connecting piece; and

and a first pulley having one side coupled to the first one-way bearing and the other side coupled to the second power transmission member and rotated together with the second power transmission member.

3. The tension maintaining unit of a crawler belt apparatus for a ship according to claim 1, wherein,

the second output section includes:

a second link coupled to the second rotating member;

the second one-way bearing is combined to the second connecting piece; and

and a second pulley having one side coupled to the second one-way bearing and the second power transmission member coupled to the other side and rotating together with the second power transmission member.

4. The tension maintenance unit of a watercraft track apparatus according to claim 1, further comprising:

and a pair of idler gears disposed above the first output unit and the second output unit, and pressurizing a region of the second power transmission member connecting the first output unit and the driving unit and a region of the second power transmission member connecting the second output unit and the driving unit.

5. The tension maintaining unit of a crawler belt apparatus for a ship according to claim 1, wherein,

the driving parts are arranged in a pair and are respectively connected to the first output part and the second output part.

6. The tension maintaining unit of a crawler belt apparatus for a ship according to claim 1, wherein,

one side portion of the first one-way bearing is directly coupled to the first rotating member, and the other side portion is directly coupled to the driving portion,

one side portion of the second one-way bearing is directly coupled to the second rotating member, and the other side portion is directly coupled to the driving portion,

the driving part is provided as a pair and is coupled to the first one-way bearing and the second one-way bearing, respectively.

7. The tension maintaining unit of a crawler belt apparatus for a ship according to claim 1, wherein,

the first rotating member and the second rotating member are provided as timing pulleys or sprockets.

8. The tension maintaining unit of a crawler belt apparatus for a ship according to claim 1, wherein,

the first power transmission member includes a track segment,

the second power transmission member connecting the first output portion, the second output portion, and the driving portion includes a belt.

9. The tension maintenance unit of a watercraft track apparatus according to claim 1, further comprising:

and a tension maintaining tensioner for supporting a region of the second power transmission member connecting the first output portion and the second output portion.

10. A watercraft track apparatus comprising:

a crawler belt body having a first rotating member that supports one side portion of a first power transmission member and rotates together with the first power transmission member, and a second rotating member that is disposed apart from the first rotating member and supports the other side portion of the first power transmission member; and

a tension maintaining unit having a first output portion connected to the first rotating member and having a first one-way bearing, a second output portion connected to the second rotating member and having a second one-way bearing, and a driving portion transmitting power to the first output portion and the second output portion,

the first one-way bearing is freely rotated to prevent tension of the first power transmission member from being relaxed when the track body is moved in the forward direction, and the second one-way bearing is driven by power,

the second one-way bearing is freely rotated to prevent tension of the first power transmission member from being relaxed when the track body moves in the backward direction, and the first one-way bearing is driven by power.

11. The watercraft track apparatus of claim 10, further comprising:

and a tension maintaining tensioner for supporting a region of the second power transmission member connecting the first output portion and the second output portion.