KR101487673B1 - Canister-type thruster - Google Patents

Abstract

A canister thruster is disclosed. The canister-type thruster according to the embodiment of the present invention includes a canister that ascends and descends in a trunk of a ship or a floating structure, a lift device that lifts the canister, and a guide device that guides the lift of the canister. The rack gear includes a rack gear which is installed in the trunk and has a pinion gear engaged with the rack gear and a driving source for driving the rack gear. And an entry guide tooth which is provided at the end portion where the pinion gear and the initial tooth are engaged and whose pitch line maintains an inclination with respect to the pitch line of the main tooth portion.

Description

CANISTER-TYPE THRUSTER {CANISTER-TYPE THRUSTER}

The present invention relates to a canister type thruster capable of smoothly engaging a rack gear and a pinion gear of a landing gear when a canister is installed.

Special vessels, such as drillships, must be able to berth in the working area of the sea, so a Dynamic Positioning System is needed to maintain its position even under the influence of algae, wind and digging. Therefore, these ships have a thruster that can control the position of the ship by generating propulsion force while changing direction in the water.

However, since the conventional thruster is installed in the lower part of the hull (underwater), there is a problem that it is difficult to repair or replace if a failure occurs. In the event of a breakdown at sea, it may be necessary to move the hull to the land where the dock is located for repair. A canister type thruster is proposed to solve these operational difficulties and to be able to perform repair or replacement work on the thruster in the maritime work area.

Korean Published Patent Application No. 10-2011-0139545 (published on December 29, 2011) and Published Patent Application No. 10-2010-0074397 (published on May 07, 2010) each show an example of a canister type thruster . The canister type thruster includes a canister installed to raise and lower in a trunk extending from a deck to a bottom of the hull, a propulsion head installed at a lower portion of the canister and capable of switching the direction of 360 degrees, driving devices for operating the propulsion head in the canister An elevating device for elevating and lowering the canister, and a guide device for guiding the elevation of the canister.

The lift device for lifting and lowering the canister may be configured to include a rack gear provided on a side surface of the canister, and a lifting and lowering drive portion having a pinion gear engaged with the rack gear and a motor for driving the rack gear.

Such a thruster can change the position of the propelling head through lifting and lowering of the canister. It is possible to switch to an operation mode in which the propulsion head is positioned below the hull bottom, a movement mode in which the propulsion head is pulled up into the trunk when the hull is operated, and a maintenance mode in which the propulsion head is pulled up to the maintenance area inside the hull . It is also possible to use a crane or the like to raise the canister and the propelling head together and separate them from the hull.

On the other hand, the canister is difficult to handle because it is a huge structure having a width of about 5 to 6 m in cross section and a height of about 10 m. The weight of the canister and the device mounted thereon is also very large. Therefore, it is very difficult to install the canister into the trunk of the hull or detach it from the hull for repairs. This is because accurate integration of the guide device provided between the canister and the trunk is required at the time of installation, and the bite of the rack gear and the pinion gear of the lift device must be accurately maintained. If the entry of the canister is disregarded during the installation process, the rack gear and the pinion gear may engage with each other, which may cause failure of the lifting and driving portion.

Korean Patent Publication No. 10-2011-0139545 (disclosed on Dec. 29, 2011) Korean Patent Publication No. 10-2010-0074397 (published on Jul. 02, 2010)

It is an object of the present invention to provide a canister-type thruster in which smooth initial engagement of a rack gear and a pinion gear of a landing gear can be achieved when a canister is installed.

The embodiments of the present invention are intended to provide a canister-type thruster capable of easily raising and lowering the canister while being easily manufactured and installed.

According to one aspect of the present invention, there is provided a canister including a canister that lifts and rides in a trunk of a hull or a floating structure, a lift device that lifts the canister, and a guide device that guides the lift of the canister, The rack gear includes a pinion gear and a pinion gear mounted on the trunk to engage the rack gear and a driving source for driving the rack gear. And a canister type thruster which is provided at the end portion where the pinion gear and the initial pinion are engaged and whose pitch line maintains an inclination with respect to the pitch line of the main tooth portion.

The entrance guide teeth may be formed in the same tooth shape as the main teeth and the height of the teeth may be lower than that of the main teeth.

The height of the tip of the entry guide tooth portion may gradually increase toward the main tooth portion from the end of the rack gear.

The guide device includes an upper guide unit installed on an inner surface of the trunk of the upper part of the lifting and lowering part to guide the lifting and lowering of the rack gear, a lower guide unit installed on the inner surface of the trunk of the lower part of the lifting and lowering part, .

Wherein the upper guide unit and the lower guide unit are fixed to the inner surface of the trunk, a tooth bracket provided on the support bracket and in contact with the main teeth of the rack gear to guide the raising and lowering, And a side guide portion for guiding the elevation in contact with the side surface of the gear.

The rack gear may be provided on both sides of the rack gear in such a manner that the pinion gear and the main teeth portion that are engaged with each other are symmetrical to each other, and the tooth surface guide portion may be symmetrical on both sides of the support bracket to guide the both sides of the rack gear. have.

The tooth surface guide portion and the side guide portion may include sliding pads mounted on the rack gear so as to be detachable from and in contact with the rack gear.

According to another aspect of the present invention, there is provided a cargo handling system comprising: a canister that lifts or rides in a trunk of a ship or a floating structure; a lift device that lifts the canister; and a guide device that guides the lift of the canister, And a lifting and driving unit having a pinion gear mounted on the canister and engaged with the rack gear and a driving source for driving the pinion gear, the rack gear being mounted on the canister, And an entry guide tooth which is provided on an end portion where the pinion gear and the initial tooth are engaged and whose pitch line maintains a tilt with respect to the pitch line of the main tooth portion.

The canister type thruster according to the embodiment of the present invention includes the pinion gear of the elevation driving portion and the entrance guiding portion at the end portion of the rack gear which is initially engaged, so that the rack gear and the pinion gear can be smoothly stitched at the initial stage, This makes it possible to safely protect the rack gears and the elevator shaft from the impact of the installation.

The canister type thruster according to the embodiment of the present invention can guide smooth engagement between the rack gear and the pinion gear even if the direction of the rack gear is slightly shifted in the process of engaging the rack gear and the pinion gear, So that an easy installation can be realized.

In the canister type thruster according to the embodiment of the present invention, since the guiding device and the landing gear are arranged on the same line, it is possible to realize an easy installation. It is possible to simplify the configuration of the guide device, thereby reducing the manufacturing cost and increasing the productivity.

1 is a cross-sectional view illustrating an inner structure of a canister type thruster according to an embodiment of the present invention and a hull mounted state thereof.
2 is a perspective view of a canister type thruster according to an embodiment of the present invention.
Figs. 3 to 5 are cross-sectional views taken along line AA of Fig. 1, showing the canister moved to the operating mode, the moving mode, and the maintenance mode, respectively.
FIG. 6 is a cross-sectional view showing a cross-sectional structure of a canister and a trunk of a canister type thruster according to an embodiment of the present invention and a configuration of a restraining device for restricting the canister.
7 is a perspective view of a lower guide unit of a canister type thruster according to an embodiment of the present invention.
8 is a front view of the lower guide unit of the canister type thruster according to the embodiment of the present invention.
Fig. 9 shows the configuration of the entrance guide teeth of the rack gear in the canister type thruster according to the embodiment of the present invention, and the initial state of the entrance guide teeth and the pinion gear teeth.
10 is a cross-sectional view illustrating a canister type thruster according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 shows an internal configuration of a canister type thruster and a hull attachment state according to the present embodiment.

The canister type thruster 100 according to the embodiment of the present invention can be applied to a ship or a floating structure that needs to maintain an anchoring state in a working area in the sea. For example, it can be applied to drillships drilling for oil and gas resources, floating production storage offloading (FPSO), and so on. The canister type thruster 100 can be applied to special ships such as a tugboat, icebreaker, and the like as well as ordinary transportation vessels in addition to the case where position control is required in an anchored state.

Referring to FIGS. 1 and 2, a ship 1 (or a floating structure) of a ship to which a canister type thruster 100 is applied has a trunk 2 penetrating in the vertical direction. The thruster 100 includes a canister 110 installed in the trunk 2 so as to be able to move up and down, a propulsion head 130 installed at a lower portion of the canister 110, a lifting device 140 moving the canister 110 up and down, And a guide device for guiding the lifting and lowering of the canister 110.

 1, 2, and 6, the canister 110 may be provided in the form of a rectangular box whose bottom and side surfaces are watertight. The trunk 2 of the hull 1 may be in the form of a rectangular barrel slightly larger than the canister. As an example, the canister 110 and the trunk 2 may have a rectangular cross-sectional shape, but the cross-sectional shape of the canister 110 and the trunk 2 may be variously changed, such as hexagon, octagon, .

As shown in FIG. 1, the canister 110 can be divided into a plurality of spaces by a plurality of decks 112, 113, and 114 spaced apart from each other in the vertical direction. The lower compartment 116 between the bottom plate 111 and the first deck 112 from the lower side of the canister 110, the drive device room 117 between the first deck 112 and the second deck 113, An auxiliary equipment room 118 between the second deck 113 and the third deck 114 and an upper compartment 119 between the third deck 114 and the top plate 115. In addition, a ladder 120 may be installed vertically in the canister 110 so as to move to each space.

A drive motor 121 for driving a propulsion head 130 to be described later is installed in the drive device room 117 and various control equipment and power supply equipment for controlling the operation of the thruster 100 are installed in the auxiliary equipment room 118 Can be installed. Here, as an example, the configuration of the inside of the canister 110 is presented only, and the internal configuration of the canister 110 is not limited to this form. The inside of the canister 110 can be variously changed according to the design.

1 to 3, the propulsion head 130 includes a propeller 131, a streamlined propeller support 132 for supporting the propeller 131, and a propeller support 132 extending upwardly from the propeller support 132, And a cylindrical shroud 135 provided around the propeller 131 for guiding the propulsion water is provided in the vertical support portion 133. The vertical support portion 133 includes a vertical support portion 133 rotatably supported by the bottom plate 111 of the canister 110, can do.

The lower compartment 116 of the canister 110 is provided with a drive shaft 136 for transmitting the rotation of the drive motor 121 to the propeller 131 and a vertical support portion 133 and a propeller support portion 132 , Rotation shafts and gears for connecting the drive shaft 136 and the propeller 131 for power transmission are installed. Steering motors 137 may be installed in the lower compartment 116 to rotate the rotation link 134 to rotate the propulsion head 130 360 degrees.

The propelling head 130 can rotate propeller 131 by the operation of the driving motor 121 in a state where the propelling head 130 is positioned below the bottom surface of the hull 1 as shown in FIGS. In addition, the propulsion head 130 can be rotated by the operation of the steering motors 137 to control the direction of the propulsion water. The propulsion water can move the hull 1 to a desired position so that the hull 1 can maintain its position in the sea despite the influence of algae or waves. The propeller in which the propelling head 130 rotates at the bottom of the hull 1 is also referred to as an azimuth thruster.

The lifting device 140 for moving the canister 110 up and down can be installed between the outer surface of the canister 110 and the inner surface of the trunk 2, as shown in FIGS. Also, elevating devices 140 of the same type may be provided on both sides of the canister 110 so that both sides of the canister 110 can be raised and lowered on the same condition.

Each lifting and lowering device 140 includes a rack gear 141 fixed to the side surface of the canister 110 and extended in the lifting direction and two pinion gears 141 and 142 fixed to the inner surface of the trunk 2, (142), and an elevation driving unit (143) having a driving source for driving these pinion gears (142).

2 and 3, the rack gear 141 is extended from the upper side to the lower side of the canister 110 and has two pinion gears 142 on both sides in the width direction thereof and main teeth 141b (Hereinafter referred to as a " main tooth portion " for the purpose of distinguishing it from the later-described entrance guide tooth portion 141c). The present embodiment shows a configuration in which the two pinion gears 142 are engaged with the both main side portions 141b of the rack gear 141 in order to realize stable lifting and lowering of the main gear portion 141b of the rack gear 141, And one pinion gear 142 may be engaged with the pinion gear. The rack gear 141 includes a body portion 141a and a main tooth portion 141b. The body portion 141a of the rack gear 141 and the main tooth portion 141b on both sides thereof are integrated. However, May be separately manufactured and then coupled to each other. Further, since the rack gear 141 is a long and large component for realizing lifting and lowering of the canister 110, which is a huge structure, it may be divided into a plurality of elements,

As shown in Fig. 1, the lifting drive portion 143 can be installed at a position higher than the upper and lower middle portions of the trunk 2, and on both sides of the inner surface of the trunk 2 where the lifting drive portion 143 is located, And an installation space 3 for installation and maintenance of the air conditioner 143 may be provided. The drive source of the lifting drive portion 143 may include a reduction gear device capable of realizing a decelerated rotation of the two pinion gears 142 and a motor for driving the reduction gear device, As shown in FIG.

The raising and lowering device 140 can move up and down the canister 110 by raising and lowering the rack gear 141 by the operation of the raising and lowering driving part 143, The position can be changed. That is, as shown in FIG. 3, an operation mode in which the propulsion head 130 is positioned below the bottom of the hull 1 to perform position control of the hull 1, A driving mode in which the head 130 is pulled up into the trunk 2, a maintenance mode in which the propulsion head 130 is pulled up to the maintenance position on the upper part of the trunk 2 for maintenance of the propulsion head 130, Mode.

5, a maintenance space 6 for maintenance of the propulsion head 130 may be provided on the side of the trunk 2 at a height where the propulsion head 130 is located in the maintenance mode . The maintenance space 6 may be of sufficient size to separate the components of the propulsion head 130 and store them therein or to allow the operator to access the propulsion head 130 to perform maintenance, It may be located above the surface of the water.

As shown in FIGS. 3 and 6, the canister type thruster 100 includes a plurality of restraint devices 150 that can restrain the canister 110 without shaking in a state of being switched to an operation mode, a moving mode, Respectively.

The restraint apparatus 150 includes a driving unit 151 installed in the canister 110 and driven by a driving unit 151 and a driving unit 151 including a motor or a hydraulic cylinder and a latching rod 152 for projecting outside the canister 110, And a plurality of engaging members 153 which are fixed to the inner surface of the trunk 2 at a position corresponding to the restraining device 150 and have grooves which are engaged with the engaging rod 152. The plurality of latching members 153 may be provided at positions corresponding to the engagement of the latching rod 152 in a state where the canister 110 moves to the operation mode, the movement mode, and the maintenance mode.

1 and 2, the guide device for guiding the lifting and lowering of the canister 110 is provided on the inner surface of the trunk 2 on the upper side of the elevation drive portion 143 to support the rack gear 141 A lower guide unit 160 for guiding the raising and lowering of the rack gear 141 by supporting the rack gear 141 provided on the inner surface of the trunk 2 under the raising and lower driving unit 143, Unit 170, as shown in FIG.

That is, in this embodiment, the upper guide unit 160 and the lower guide unit 170 are mounted on the inner surface of the trunk 2 coinciding with the ascending / descending trajectory of the rack gear 141, so that the rack gear 141 is slidably supported Thereby guiding smooth up and down of the canister 110. Herein, only the upper guide unit 160 and the lower guide unit 170 are shown as an example, but the guide apparatus is provided in the same shape as the upper or lower guide units 160 and 170 so as to be additionally installed on the elevation trajectory of the rack gear 141 As shown in Fig. These guiding devices may be provided on both sides of the trunk 2 where the lifting device 140 is located.

2, 7 and 8, the lower guiding unit 170 includes a support bracket 171 fixed to the inner surface of the trunk 2 and a guide bracket 171 provided symmetrically on both sides of the support bracket 171, Two guide surfaces 172 that are in contact with the main tooth portions 141b on both sides of the rack gear 141 and two side surfaces of the rack gear 141 that are in contact with the side surfaces (flat surfaces on which no teeth are formed) And a side surface guide portion 173 provided on the support bracket 171 between the tooth surface guide portions 172. The lower guiding unit 170 can support the rack gear 141 without shaking by keeping the two tooth guiding portions 172 and the side guiding portions 173 around the rack gear 141 in the form of a D shape.

The support bracket 171 constituting the skeleton of the guide portion 172 and the side guide portion 173 can be manufactured by welding a plurality of metal plates by welding and the support bracket 171 is welded And can be fixed to the inner surface of the trunk.

The guide portion 172 and the side guide portion 173 are respectively provided with sliding pads 172a and 173a which come in contact with the rack gear 141 and guide the lifting and lowering. Each of the sliding pads 172a and 173a may be detachably coupled to the inner surface of the tooth guide 172 and the side guide 173 so that the sliding pads 172a and 173a can be replaced when worn or damaged. One or more thickness adjusting plates 172b and 173b may be provided on the back surface of the sliding pads 172a and 173a to adjust the gap between the sliding pads 172a and 173a and the rack gear 141 during installation.

The tooth surface guide portion 172 and the side guide portion 173 are provided with entrance guide portions 172c and 173c which maintain the inclination with respect to the raising and lowering direction of the rack gear 141 so that the rack gear 141 can smoothly enter the inside thereof, And inclined guide surfaces 172d and 173d may be formed at the upper and lower ends of the sliding pads 172a and 173a to maintain the inclination with respect to the vertical direction of the rack gear 141. [

The sliding pads 172a and 173a may be formed of a non-metallic material having a lower rigidity than the rack gear 141 so as to guide smooth sliding movement while protecting the main teeth 141b of the rack gear 141. [ It may preferably be a synthetic resin material having a small friction resistance and excellent abrasion resistance and impact resistance.

The upper guide unit 160 may also be provided in substantially the same form as the lower guide unit 170. However, considering that the rack gear 141 is disengaged from the upper guide unit 160 or the lower guide unit 170 when the canister 110 is lowered or raised, The directions of the entrance guiding portions 172c and 162c for guiding the entrance of the entrance guide can be reversed. 3, the upper guide unit 160 may have an entry guide portion 162c disposed at a lower portion thereof and the lower guide unit 170 may have an entry guide portion 172c disposed at an upper portion thereof.

The distance between the upper guide unit 160 and the lower guide unit 170 may be shorter than the entire length of the rack gear 141. [ 5, the raising and lowering rack gear 141 is supported by the upper guide unit 160 and the pinion gear 142 of the elevation drive unit 143, or as shown in Fig. 3, The rack gear 141 is supported by the pinion gear 142 of the lifting and driving unit 143 and at least two points of the rack gear 141 are supported.

When the canister type thruster 100 is installed in the hull 1 for the first time or is separated from the hull 1 for repairs, the canister 110 having the propulsion head 130 mounted thereon is lifted by a crane or the like The canister 110 is lowered so that the canister 110 enters the opening in the upper portion of the trunk 2. [

At this time, the rack gears 141 on both sides of the canister 110 are guided by the upper guide unit 160 and then engaged with the pinion gear 142 of the elevation driving unit 143 located below the rack guide 141, Lt; / RTI > Thereafter, the canister 110 can be introduced by the operation of the lifting drive unit 143, and the descending rack gear 141 can naturally enter the lower guide unit 170 and be stably supported.

Particularly, in this embodiment, since the upper guide unit 160 and the lower guide unit 170 are arranged on the same line as the rack gear 141 to guide the rack gear 141, the guide device and the lift device are disposed at different positions It is possible to implement an easy installation as compared with a normal canister type thruster.

If the guiding device and the landing gear are provided separately like a normal canister type thruster, precise engagement of the rack gear and the pinion gear of the lifting gear should be taken into consideration while maintaining accurate coupling of the guide device during the installation process. And it is very difficult to implement accurate installation. Large structures such as canisters are not easy to handle due to their size and weight. However, in the canister type thruster of this embodiment, the upper guide unit 160 and the lower guide unit 170 are disposed on the same line as the rack gear 141 of the elevating device 140 to guide the raising and lowering of the rack gear 141 It is possible to realize easier installation. In addition, since it is not necessary to separately install a rail for guiding the canister 110, it is possible to simplify the construction, thereby reducing manufacturing cost and increasing productivity.

When the rack gear 141 first engages with the pinion gear 142 of the elevation drive unit 143 in the process of installing the canister 110 on the trunk 2, And the direction in which the rack gear 141 enters the pinion gear 142 may be somewhat deviated. In this situation, when the rack gear 141 and the pinion gear 142 are engaged with each other, a great impact may be applied to the pinion gear 142 or the rack gear 141, 143). ≪ / RTI > Since the load of the canister 110, which is a huge structure, acts on the descending rack gear 141, a large impact may be exerted on the portion where the initial engagement of the rack gear 141 is interlocked.

In consideration of this point, the rack gear 141 according to the present embodiment realizes a smooth initial bite on the end portion where the pinion gear 142 and the initial pinion are engaged, as shown in Fig. 9, And an entry guide tooth portion 141c.

The entry guiding teeth 141c can be integrally provided by the same material as the main teeth 141b and the body 141a of the rack gear 141. [ The entering guide teeth 141c may be composed of one or a plurality of pitch lines C and the pitch line C maintains a predetermined angle alpha slope with respect to the pitch line B of the main teeth 141b. Therefore, the width of the rack gear 141 gradually increases from the end portion toward the main tooth portion 141b due to the entry guide tooth portion 141c.

The tooth profile of the entry guide tooth portion 141c may be the same as that of the main tooth portion 141b and the height of the tooth tip is formed to be lower than the main tooth portion 141b as the pitch line C maintains the inclination. In the case of a plurality of entry guide teeth 141c, the height of the tip gradually increases from the end of the rack gear 141 toward the main teeth 141b. Here, as an example, a case is shown in which the tooth profile of the entry guide tooth portion 141c is the same as that of the main tooth portion 141b and the pitch line C of the entry guide tooth portion 141c is inclined. May be realized by a method of making the tooth size different from that of the main tooth part 141b or smaller than the size of the main tooth part 141b instead of changing the angle of the pitch line C thereof.

The entry guide tooth 141c can smoothly enter between the two pinion gears 142 when the rack gear 141 is initially engaged with the pinion gear 142 in the installation of the canister 110. [ As shown in Fig. 9, since the lower end of the rack gear 141 provided with the entry guiding teeth 141c is relatively narrow, it can smoothly enter between the two pinion gears 142. [ Even if the direction of the rack gear 141 is somewhat deviated in the course of the initial bite of the rack gear 141 and the pinion gear 142, a natural bite is sequentially made from the low entry guide tooth 141c Therefore, the initial bite impact can be minimized. Therefore, the teeth of the rack gear 141 and the pinion gear 142 and the lifting and driving portion 143 can be safely protected during the installation process.

Even if the rotational position of the pinion gear 142 is disadvantageous to the rotation of the pinion gear 142 during the initial bite of the rack gear 141, the relatively low entry guide tooth 141c enters the space between the two pinion gears 142 The pinion gear 142 is rotated so that the pinion gear 142 can be engaged with the teeth 142a of the pinion gear 142 and can easily engage with the main teeth 141b that follow in the process, ) Can be aligned. Therefore, the engagement between the main tooth portion 141b and the pinion gear teeth portion 142a can be smoothly achieved.

The entry guide tooth portion 141c is formed in such a manner that the rack gear 141 smoothly engages with the initial portion of the pinion gear 142. In addition to the effect of the canister 110 being installed, The effect of alleviating the impact upon entering the lower guide unit 170 can be exhibited. The width of the lower end of the rack gear 141 is relatively narrow due to the entry guiding teeth 141c so that the rack gear 141 can smoothly enter the upper guide unit 160 or the lower guide unit 170 .

10 shows another embodiment of the canister-type thruster. 10, the lifting device 240 for lifting the canister 110 includes a rack gear 241 provided on the inner surface of the trunk 2 so as to be long in the lifting direction of the canister 110, An elevation driving unit 243 having a pinion gear 242 and a drive source for driving the pinion gear 242 is mounted on the canister 110. [ That is, the mounting position of the rack gear 241 and the lifting and lowering driving unit 243 is changed, unlike the above-described example. An upper guide unit 260 and a lower guide unit 270 are installed on the side surface of the canister 110 so that the guide apparatus can move along the rack gear 241.

This canister type thruster can realize the lifting and lowering of the canister 110 by the operation of the lifting drive portion 243 and the upper guide unit 260 and the lower guide unit 270 provided on the canister 110 can be moved by the rack gear 241 So that the lift of the canister 110 can be guided.

In the example of FIG. 10, the upper end of the rack gear 241 may be provided with an entry guide tooth 241c of the same type as the above-mentioned example. The entrance guide tooth 241c is provided at the initial position of the canister 110 while reducing the impact of the pinion gear 242 of the elevation drive portion 243 installed on the canister 110 against the rack gear 241 during the installation of the canister 110, This biting can be done. The upper guide unit 260 and the lower guide unit 270 are engaged with the rack gear 241 during the installation process of the canister 110 because the width of the upper end of the rack gear 141 becomes narrow due to the entry guide tooth 141c. So that a smooth coupling can be achieved. In the example of FIG. 10, the remaining configurations may be substantially the same as those of the above-mentioned embodiment, so that a description thereof will be omitted in order to avoid redundancy.

2: trunk, 110: canister,
130: propelling head, 131: propeller,
140: lifting device, 141: rack gear,
141c: entry guide teeth, 150: restraint device,
160: upper guide unit, 170: lower guide unit.

Claims (8)

A canister 110 that ascends and descends in the hull 1 or the trunk 2 of the floating structure,
A rack gear 141 installed on the outer surface of the canister 110 in a vertical direction and a pinion gear 142 mounted on the trunk 2 and engaged with the rack gear 141, A lifting and lowering device 140 having a lifting and lowering drive part 143 equipped with a lifting and lowering device 143 for lifting and lowering the canister 110,
And a guiding device provided on the inner surface of the trunk (2) and guiding the lifting and lowering of the rack gear (141) in contact with the teeth and side surfaces of the rack gear (141)
The rack gear 141 is provided at the end portion where the pinion gear 142 is initially engaged with the pinion gear 142 and meshed with the main gear portion 141b for lifting and lowering the pitch line C And an entry guide tooth portion (141c) that maintains a tilt with respect to a pitch line (B) of the main tooth portion (141b). The method according to claim 1,
The entry guide tooth portion 141c is provided in the same tooth shape as the main tooth portion 141b and has a height lower than that of the main tooth portion 141b. The method according to claim 1,
Wherein the entrance guide teeth portion 141c gradually increases in height from the end portion of the rack gear 141 toward the main portion 141b. The method according to claim 1,
The guide device includes an upper guide unit 160 installed on the inner surface of the trunk 2 at the upper part of the elevation driving unit 143 to guide the elevation of the rack gear 141, And a lower guiding unit (170) installed on an inner surface of the lower guide unit (2) to guide the raising and lowering of the rack gear (141). 5. The method of claim 4,
The upper guide unit 160 and the lower guide unit 170
A support bracket 171 fixed to the inner surface of the trunk 2,
A tooth surface guide portion 172 provided on the support bracket 171 and brought into contact with the main tooth portion 141b of the rack gear 141 to guide the lifting and lowering thereof,
And a side guide portion (173) provided on the support bracket (171) and brought into contact with a side surface of the rack gear (141) to guide the lifting and lowering of the rack gear (141). 6. The method of claim 5,
The rack gear 141 is provided on both sides of the rack gear 141 in such a manner that the pinion gear 142 and the main teeth 141b,
The tooth surface guide part (172) is provided symmetrically on both sides of the support bracket (171) so as to guide the both side main part (141b) of the rack gear (141). The method according to claim 5 or 6,
The tooth surface guide portion 172 and the side surface guide portion 173 are connected to the rack gear 141 by means of a canister type thruster including sliding pads 172a and 173a, (100). A canister 110 that ascends and descends in the hull 1 or the trunk 2 of the floating structure,
A rack gear 241 provided on the inner surface of the trunk 2 in a lengthwise direction of the canister 110 and a pinion gear 242 mounted on the canister 110 and engaged with the rack gear 241, And an elevation driving unit 243 having a driving source for driving the lifting and lowering unit 240. The lifting and lowering device 240 for lifting and lowering the canister 110,
And a guide device installed on the outer surface of the canister 110 to guide the lifting and lowering of the canister 110 in contact with the teeth and side surfaces of the rack gear 241,
The rack gear 241 is provided on an end portion where the pinion gear 242 is initially engaged with the pinion gear 242 and is engaged with the pinion gear 242 for raising and lowering the pitch line, And an entrance guide tooth portion (241c) which maintains an inclination with respect to the canister-type thruster.

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