KR101422492B1 - Rotation axis for ship propulsion and propulsion apparatus having the same - Google Patents

Abstract

A propulsion shaft for a ship and a propulsion device for a ship including the same are disclosed. The propulsion shafts according to the embodiments of the present invention are characterized in that the propulsion shafts for propelling a propulsion vessel equipped with a propeller that rotates inversely to the main propulsion spindle main propeller and the propeller propellers are formed at the rear of the propulsion shaft, A rear propeller fixing portion formed at a stern rear end of the first shaft portion and provided with a hub of a rear propeller and a rear propeller fixing portion formed at a rear end portion of the rear propeller fixing portion, And a second shaft portion extending from the first tapered portion and having a diameter corresponding to the inner diameter of the first bearing and to which the first bearing is fixed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a propulsion device for propulsion of a ship,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship, and more particularly, to a propeller for propelling a propeller for propelling a ship and a propulsion device including the same.

A typical marine propulsion system has one helical propeller. However, the propulsion system equipped with one propeller has a large energy loss because it can not utilize the rotational energy of the water stream due to the rotation of the propeller as a propulsion force.

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

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

In addition, in the dual inversion propulsion system, various components constituting the two propellers and the inverse rotation device have to be installed in the spindle rotation axis, and in the structure of the conventional spindle rotation axis, it has been difficult to install the components in the spindle rotation axis.

Embodiments of the present invention are to provide a propeller for propelling a ship and a propulsion device for propelling a ship such that a bearing or the like can be easily installed on a main shaft rotation axis by forming a taper and / or a step on a main shaft rotation axis.

In addition, an embodiment of the present invention is to provide a rotation shaft for propelling a ship and a propulsion device for a ship, in which the diameter of the main shaft rotation shaft is made smaller than the inner diameter of a bearing inserted in the main shaft rotation shaft.

According to an aspect of the present invention, there is provided a rotary shaft for propelling a ship, which is equipped with a main propeller and a front propeller rotating in a direction opposite to the rear propeller, the propeller being provided at the rear end of the rotary shaft and rotatably supporting the front propeller with respect to the rotary shaft A rear propeller fixing portion formed at a stern rear end of the first shaft portion and provided with a hub of the rear propeller and a rear propeller fixing portion extending in the fore-going direction from the first shaft portion to a diameter And a second shaft portion extending from the first tapered portion and having a diameter corresponding to the inner diameter of the first bearing, wherein the first bearing is fixed to the first shaft portion.

The second shaft portion may include a first step portion that axially supports the first bearing.

And a third shaft portion extending from the first step portion and having a larger diameter than the second shaft portion and to which the second bearing is fixed.

And a second tapered portion provided between the second shaft portion and the third shaft portion and extending in the forward direction to increase the diameter.

And a second stepped portion provided on the third shaft portion and axially supporting the second bearing.

According to another aspect of the present invention, there is provided a propeller comprising: a rotary shaft; a rear propeller fixed to the rotary shaft; a front propeller rotatably supported on the rotary shaft in front of the rear propeller; And a first bearing for supporting the front propeller so as to be able to rotate in a reverse direction with respect to the rotation shaft, wherein the rotation shaft has a first shaft portion having a diameter smaller than an inner diameter of the first bearing, And a second shaft portion extending from the first taper portion and on which the first bearing is mounted.

The rotation shaft may include a rear propeller fixing portion formed at a stern end portion of the first shaft portion and press-fitting a hub of the rear propeller.

The rotation shaft may include a first step portion provided on the second shaft portion and axially supporting the first bearing.

A connecting member for transmitting the power of the inverting rotating device to the front propeller, and a second bearing for rotatably supporting the connecting member with respect to the rotating shaft, wherein the rotating shaft rotates in the fore- And a third shaft portion extending from the second taper portion and having the second bearing inserted therein, the third shaft portion being fixed to the second taper portion.

And a second stepped portion provided on the third shaft portion and axially supporting the second bearing.

The first bearing includes a first thrust bearing disposed between a front inner surface of the hub of the forward propeller and an outer surface of the second shaft portion and a second thrust bearing disposed adjacent to a rear side of the first thrust bearing .

Wherein the reverse rotation device comprises a gear box accommodated in a space provided at the back of the hull, a drive bevel gear connected to the rotation shaft inside the gear box so as to rotate together, and a drive bevel gear rotatably supported around the rotation shaft inside the gear box, A driven bevel gear connected to the hub of the propeller, and at least one inverted bevel gear for transmitting the rotation of the driven bevel gear to the driven bevel gear for transmission.

The propulsion device for a ship according to an embodiment of the present invention is characterized in that a plurality of shaft portions and a tapered portion having a larger diameter in the fore-and-aft direction are formed on the spindle rotation shaft, and the bearing is inserted into the spindle rotation shaft at the rear end of the spindle rotation shaft, .

In the propulsion device for a ship according to an embodiment of the present invention, a multi-stepped portion is provided on a spindle rotation shaft, and a bearing is installed in the stepped portion to thereby support the bearing in the axial direction.

Further, in the propulsion device for a ship according to the embodiment of the present invention, a tapered portion is formed at the rear side of the shaft portion where the bearing is mounted, and the bearing is press-fitted so that the bearing is firmly fixed to the main shaft rotation shaft.

In addition, since the propulsion device according to the present embodiment can separate the front and rear propellers from the spindle rotation shaft and can separate the gear box of the reverse rotation device from the hull, it is possible to easily carry out maintenance work Since the propulsion device according to the present embodiment realizes the inversion of the forward propeller by using a plurality of bevel gears, it can reduce its volume and simplify the structure of the power transmission system as compared with a conventional planetary gear type reverse rotation device . In addition, since the volume of the inverting rotating device can be reduced, it is possible to install the inverting rotating device at the rear of the hull.

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 perspective view of a rotary shaft according to an embodiment of the present invention.
5 is a cross-sectional view illustrating bearings mounted on a rotating shaft of a propulsion device according to an embodiment of the present invention. FIG. 5 is a detailed sectional view showing a mounting structure of bearings for supporting a front propeller.
6 is a detailed sectional view showing a mounting structure of bearings for supporting a front propeller of a propulsion device according to an embodiment of the present invention. FIG. 6 shows a state in which the first radial bearing is separated.
FIG. 7 is a cross-sectional view illustrating a state in which the reversing and rotating device of the propulsion device according to the embodiment of the present invention is mounted on a rotary shaft.
Sectional view showing an example in which the reverse rotation device is detached.
FIG. 48 is an exploded perspective view of the inverting rotating device of the propulsion device according to the embodiment of the present invention. FIG.
89 is a cross-sectional view illustrating a state in which an inversion rotating device of the propulsion device according to the embodiment of the present invention is installed in an installation space at the rear of the hull.
910 is a sectional view of the first sealing device of the propulsion device according to the embodiment of the present invention.
Figure 1011 is an exploded perspective view of the first sealing device of the propulsion device according to the embodiment of the present invention.
112 is a sectional view of the second sealing device of the propulsion device according to the embodiment of the present invention.

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

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. 1 and 2, a propulsion device for a ship according to an embodiment of the present invention includes a rotary shaft 200 and a front propeller 10 (hereinafter referred to as a " front propeller " And a rear propeller 20 and provided with a reverse rotation device 30 provided on the rear end 3 of the hull 1 in order to realize the opposite rotation of the front propeller 10 and the rear propeller 20. The present embodiment is a double reversing propulsion device in which two propellers 10 and 20 rotate in opposite directions to generate propulsive force.

The rear end 3 of the hull 1 is a portion projecting rearward from the hull 1 in a streamlined manner for installing the front and rear propellers 10 and 20 and the reverse rotation device 30, ). The hull rear 3 can be made of casting and then fixed to the hull 1 by welding. And an installation space (4) penetrating front and back so as to accommodate the gear box (40) of the reverse rotation device (30) to be described later. The inner surface of the installation space 4 can be machined into a cylindrical shape by boring so as to correspond to the outer shape of the gear box 40 of the reverse rotation device 30. [

The spindle rotational shaft 5 can be connected to the main drive shaft 6 inside the hull 1 in such a manner that the leading end of the spindle rotational shaft 5 protruding forward of the gearbox reversing and rotating device 430 can be separated and engaged. 1, the main drive shaft 6 is connected to a driving source 8 (a diesel engine, a motor, a turbine or the like) provided in the hull 1 so that the main shaft rotation shaft 5 and the main drive shaft 6 It can rotate.

The main drive shaft 6 and the main shaft rotation shaft 5 can be connected to each other by a coupling device 7 of a cylindrical shape so that they can be separated and coupled by a spline shaft joining method. Here, the spline shaft splicing is shown as an example, but the connection method of the main drive shaft 6 and the spindle rotational shaft 5 is not limited thereto. A flange coupling system, a friction clutch system, a magnetic clutch system, or the like can be selectively employed.

FIG. 2 is a sectional view of a propulsion device according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a propulsion device according to an embodiment of the present invention.

2 and 3, the front propeller 10 is rotatably installed on the outer surface of the main shaft rotation axis 5 between the rear propeller 20 and the reverse rotation device 30. [ The front propeller 10 has a hub 11 rotatably supported on the outer surface of the main shaft rotating shaft 5 and a plurality of blades 12 provided on the outer surface of the hub 11. [ The front propeller 10 may be installed on the outer surface of the main shaft rotation axis 5 before the rear propeller 20 is installed. Further, the wing angle is opposite to the wing angle of the rear propeller (20) because the wing angle is opposite to that of the rear propeller (20).

The rear propeller 20 is fixed to the rear portion of the rotary shaft 5 so as to rotate together with the rotary shaft 5. The rear propeller 20 includes a hub 21 fixed to the rotary shaft 5 and a plurality of blades 22 provided on the outer surface of the hub 21. [ The hub 21 of the rear propeller 20 can be fixed in such a manner that the shaft coupling hole 23 in the central portion is press-fitted into the outer surface of the rotary shaft 5. [ The rear propeller 20 can be more firmly fixed to the rotary shaft 5 by fastening the fixed cap 24 to the rear end of the rotary shaft 5. [

2, reference numeral 25 denotes a propeller cap mounted on the hub 21 to cover the rear surface of the rear propeller 20 hub 21 and the fixed cap 24.

2 and 3 and 3, the reverse rotation device 30 includes a gear box 40 which forms an outer appearance and is accommodated in the installation space 4 of the rear 3 of the hull 1, And a spindle rotational shaft 5 rotatably supported on the gear box 40 in a state of passing through a substantially central portion of the gear box 40. [

2 to 4, the reverse rotation device 30 includes a drive bevel gear 31 and a drive bevel gear 31 provided in the gear box 40 to rotate together with the spindle rotational shaft 200, A driven bevel gear 32 rotatably supported on a main shaft rotating shaft 5 in the form of a gear box 40 and at least one And an inverted bevel gear 33. A first connecting member 35 for connecting the spindle rotational shaft 5 and the driven bevel gear 31 and a second connecting member 36 for connecting the driven bevel gear 32 and the hub 11 of the front propeller 10 And the hub 11 of the rotary propeller 10 and the driven bevel gear 31, the driven bevel gear 32 and the front propeller 10 may be provided without the first and second connecting members 35 and 36 A direct connection structure is also possible.

The gear box 40 can be formed into one unit by accommodating the drive bevel gear 31, the driven bevel gear 32 and the inverted bevel gear 33. [ A rear propeller 20 is fixed to a spindle rotation shaft 5 extending to the rear of the gear box 40 and a front propeller 10 is rotatably supported on an outer surface between the rear propeller 20 and the gear box 40 do. The front propeller 10 includes a hub 11 connected to the inverter 30 to be rotatably supported on the outer surface of the main shaft 5 and a plurality of vanes 11 provided on the outer surface of the hub 11, 12. The front propeller 10 can be installed on the outer surface of the rear propeller 2 and is rotated in the direction opposite to that of the rear propeller 20 so that the angle of the wing is opposite to the angle of the wing of the rear propeller 20.

FIG. 4 is a perspective view of a rotary shaft according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating mounting of bearings to a rotary shaft of a propulsion device according to an embodiment of the present invention. FIG. 6 is a detailed sectional view showing a mounting structure of bearings for supporting a front propeller of a propulsion device according to an embodiment of the present invention. FIG. 7 is a perspective view of a propulsion device according to an embodiment of the present invention, FIG.

4 and 5, the rotary shaft 200 includes a rear propeller fixing portion 210 formed at the rear portion for engaging the rear propeller 20 and a rear propeller fixing portion 210 extending from the rear propeller fixing portion 210, 230 and 240 that are formed to have a larger diameter toward the forward direction and tapered portions 250 and 260 formed between the shaft portions 220, 230 and 240 and having a larger diameter toward the forward direction.

The rear propeller fixing portion 210 is formed as a tapered outer surface having a larger outer diameter toward the front and the axial coupling hole 23 of the hub 21 is formed as a tapered inner surface corresponding to the outer surface of the rear propeller fixing portion 210 So that the rear propeller 20 can be press-fitted into the rear propeller fixing portion 210.

The shaft portions 220, 230 and 240 include a first shaft portion 220 extending from the rear propeller fixing portion 210 and having a predetermined outer diameter and to which the front propeller 10 is rotatably coupled, A second shaft portion 230 having an outer diameter larger than the outer diameter of the second shaft portion 220 and having the second connecting member 36 rotatably coupled to the second shaft portion 230, A third shaft portion 240 having an outer diameter and each gear portion of the inverting and rotating device 30 rotatably coupled to the third shaft portion 240 and a third shaft portion 240 formed in front of the third shaft portion 240 and coupled with the first connecting member 35, And a driving flange (61) for transmitting the driving force of the driving motor (200) to the inversion rotating device (30).

7, the rear inner bearing 46, which has an inner diameter corresponding to the outer diameter of the third shaft portion 240, is formed in a shape such that the outer diameter of the rotary shaft 200 increases toward the front, The first shaft portion 220 and the second shaft portion 230 are smaller than the inner diameter of the rear inner bearing 46 so that the third shaft portion 240 can be easily moved to the third shaft portion 240 .

5, the first and second thrust bearings 13 and 14 having an inner diameter corresponding to the outer diameter of the second shaft portion 230 are inserted into the rear end of the rotation shaft 200 and moved to the second shaft portion 230 Since the first shaft portion 220 is smaller than the inner diameter of the first and second thrust bearings 13 and 14, the second shaft portion 230 can be easily moved to the second shaft portion 230.

The tapered portions 250 and 260 include a first tapered portion 250 provided between the first shaft portion 220 and the second shaft portion 230 and having an inclined surface shape gradually increasing in outer diameter and a second tapered portion 250 formed between the second shaft portion 230 and the third shaft portion 230, And a second tapered portion 260 provided between the shaft portion 240 and gradually increasing in outer diameter.

The rear inner bearing 46 and the first and second thrust bearings 13 and 14 are disposed on the second shaft portion 230 by providing the tapered portions 250 and 260 on the rear side of the second shaft portion 230 and the third shaft portion 240, And the third shaft portion 240, it is possible to smoothly move and facilitate assembly.

The second shaft portion 230 includes a first step portion 232 for axially supporting the first and second thrust bearings 13 and 14 and the third shaft portion 240 includes a rear inner bearing 46, And a second stepped portion 242 supporting the first stepped portion 242 in the direction of the second stepped portion 242.

The second shaft portion 230 is divided into a rear second shaft portion 231 and a front second shaft portion 233 with respect to the first step portion 232. The first and second thrust bearings 13, The propulsion force of the front propeller 10 is transmitted to the rotary shaft 200 by the first step portion 232 since the propeller 10 is supported in the axial direction by the first step portion 232 in a state of being seated on the biaxial portion 231 do.

The third shaft portion 240 is divided into a rear third shaft portion 241 and a front third shaft portion 243 with respect to the second step portion 242 and the rear inner bearing 46 is divided into a rear third shaft portion 241 so that the position of the rear inner bearing 46 can be fixed by being axially supported by the second stepped portion 242. [

The hub 11 of the front propeller 10 is supported by the first thrust bearing 13, the second thrust bearing 14 and the first radial bearing 15, as shown in Figs. 2 and 56, And can be rotatably supported on the outer surface between the first shaft portion 2205 and the second shaft portion 230. The first thrust bearing 13 and the second thrust bearing 14 are installed between the inner surface of the front side of the hub 11 and the outer surface of the rear second shaft portion main shaft 2305. The first radial bearing 15 is a hub 11 and the outer surface of the main shaft single-shaft portion 2205. In this case,

The first radial bearing 15 suffices the radial load of the front propeller 10 acting in the radial direction of the main shaft rotation axis 5 and the first and second thrust bearings 13 and 14 support the main shaft rotation axis 5 Of the thrust load acting on the front and rear axes, respectively. Specifically, the second thrust bearing 14 suffers a thrust load acting on the forward side from the forward propeller 10 when the ship is advanced, and the first thrust bearing 13 supports the forward thrust bearing 13 from the forward propeller 10 toward the stern It is possible to cope with the acting thrust load.

As shown in FIG. 56, the inner ring wheel of the first thrust bearing 13 and the inner ring wheel of the second thrust bearing 14 are arranged so as to be in contact with each other in a state of being press-fitted into the outer surface of the main shaft rotation shaft 5, And can be supported so as not to be pushed in the axial direction. The outer ring of the first thrust bearing 13 can be supported so as not to be pushed in the axial direction by being supported by the stationary ring 39 mounted on the second linking member 36 engaged with the hub 11.

A cylindrical first support ring 17a and a second support ring 17b are provided between the hub 11 of the front propeller 10 and the main shaft rotation shaft 5 so that the second thrust bearing 14 is axially It can be avoided. The first support ring 17a may be interposed between the outer ring of the second thrust bearing 14 and the outer ring of the first radial bearing 15 so that the first support ring 17a and the second support ring 17b are mutually supported, So that they are interposed between the inner ring of the thrust bearing 14 and the inner ring of the first radial bearing 15 so that they can be mutually supported. A gap adjusting ring 18 is provided on the inner surface of the hub 11 between the outer ring of the first radial bearing 15 and the first seal cover 71 to be described later so that the outer ring of the first radial bearing 15 rotates about the axis Direction. The outer ring of the first radial bearing 15 is provided on the inner surface of the hub 11 and the outer ring of the first radial bearing 15 is provided on the inner surface of the hub 11. In this case, It is possible to fix the outer ring of the first radial bearing 15 without providing the gap adjusting ring 18 so that the gap adjusting ring 18 can be selectively adopted according to the design.

The inner ring of the first radial bearing 15 can be fixed so as not to be pushed in the axial direction by mounting the cylindrical wedge member 16 between the inner ring of the first radial bearing 15 and the outer surface of the main shaft single shaft portion 2205 as shown in Fig. The wedge member 16 has a tapered outer surface whose outer diameter is reduced toward the rear and a thread formed on the outer surface of the rear side of the wedge member 16. The inner surface of the wedge member 16 can be press-fitted into the outer surface of the main shaft single- The inner ring of the first radial bearing 15 can be constrained by fastening the tightening nut 16a to the rear side thread of the wedge member 16. Therefore, the first radial bearing 15 can be firmly fixed between the outer surface of the main shaft rotation axis 5 and the inner surface of the hub 11. The wedge member 16 and the tightening nut 16a can be fastened with a fixing clip 16b for preventing loosening.

5, the first thrust bearing 13 and the second thrust bearing 14 are provided on the outer surface of the main shaft 5 at the rear portion thereof so as to be supported by the first step portion 232, The first and second support rings 17a and 17b and the wedge member 16 can be sequentially mounted on the second shaft portion.

The first and second thrust bearings 13 and 14 are connected to the first and second thrust bearings 13 and 14 through the first shaft portion 220 and the first tapered portion 250 having the outer diameters smaller than the inner diameters of the first and second thrust bearings 13 and 14, The first and second thrust bearings 13 and 14 can be easily installed and stably supported by entering the shaft portion 230 and being supported by the first step portion 232. [

6, the hub 11 of the front hopper 10 is coupled to the outside of the main shaft single-shaft portion 2205 so that the inner surface of the hub 11 is connected to the first and second thrust bearings 13, 14). The first radial bearing 15 is pushed in between the outer surface of the wedge member 16 and the inner surface of the hub 11 and then the tightening nut 16a is fastened to the wedge member 16, The inner ring of the inner ring 15 can be fixed. After the first radial bearing 15 is installed, the gap adjusting ring 18 can be provided and the first seal cover 71 can be mounted.

When the first radial bearing 15 is fixed by using the wedge member 16 as described above, a manufacturing error occurs in the components such as the first and second support rings 17a and 17b and the installation of the first radial bearing 15 The coupling error can be corrected by adjusting the mounting positions of the wedge member 16 and the first radial bearing 15 even when the position is changed. The first radial bearing 15 can be fixed in a state in which the wedge member 16 and the first radial bearing 15 are in close contact with the first and second support rings 17a and 17b, The coupling error can be minimized. The distance adjusting ring 18 is manufactured so that the distance between the outer ring of the first radial bearing 15 and the first sealing cover 71 is measured in a state in which the first radial bearing 15 is mounted, .

The first sealing cover 71 and the gap adjusting ring 18 are separated from each other and the tightening fastened to the wedge member 16 when the front propeller 10 is separated from the spindle rotational shaft 5 for subsequent trouble- After the nut 16a is released to allow the first radial bearing 15 to be detached, the front propeller 10 can be pulled backward and separated. Since the first and second thrust bearings 13 and 14, the wedge member 16 and the first and second support rings 17a and 17b are exposed after the front propeller 10 is separated, ). ≪ / RTI >

FIG. 8 is an exploded perspective view of an inverting rotary device of a propulsion device according to an embodiment of the present invention, and FIG. 9 is a cross-sectional view illustrating a state where an inverting rotary device of a propulsion device according to an embodiment of the present invention is installed in an installation space at the rear of a hull .

The gear box 40 of the reverse rotation device 30 is constituted by a drive bevel gear 31, a driven bevel gear 32 and a plurality of inverted bevel gears 33 as shown in Figs. 2, 48 and 79 A front cover 42 coupled to the body 41 to close the front side opening of the body 41 and a front cover 42 coupled to the body 41, And a rear cover 43 coupled to the body portion 41 to close the rear side opening of the rear cover.

The front cover 42 can rotatably support the first connecting member 35 passing through the center portion thereof and the rear cover 43 can rotate the second connecting member 36 passing through the center portion thereof in a rotatable manner Can support. A front bearing 44 is provided between the outer surface of the first connecting member 35 and the front cover 42 and a rear outer bearing 45 is provided between the outer surface of the second connecting member 36 and the rear cover 43 Can be installed.

A plurality of rear outer bearings 45 are provided continuously in the longitudinal direction of the main shaft rotation axis 5 so that the second connection members 36 can be rotated while being stably supported. A rear inner bearing 46 is provided between the inner surface of the second linking member 36 and the main shaft rotation shaft 5 for rotatably supporting the second linking member 36 and the first linking member 35 and the main shaft rotation axis A cylindrical sleeve bearing 47 may be provided between the outer surface of the sleeve 5 and the outer surface. A cylindrical spacing ring 49 may be provided on the outer surface of the main shaft 5 between the inner ring of the rear inner bearing 46 and the sleeve bearing 47.

The front bearings 44, the rear outer bearings 45, and the rear inner bearings 46 may all be comprised of radial bearings. These bearings 44, 45, and 46 can realize stable rotation of the radial load while supporting the radial load acting on the spindle rotational shaft 5, the first linking member 35, and the second linking member 36.

The drive bevel gear 31 is connected to the first linking member 35 by fastening a plurality of fixing bolts 31a to rotate together with the first linking member 35. [ The driven bevel gear 32 is also connected to the second linking member 36 by fastening a plurality of fixing bolts 32a. The driven bevel gear 32 may be spaced apart from the spindle rotational shaft 5 so that the inner diameter portion of the driven bevel gear 32 is not interfered with the spindle rotational shaft 5 during rotation.

The plurality of inverted bevel gears 33 are sandwiched between the driven bevel gear 31 and the driven bevel gear 32, respectively. A shaft 34 supporting the respective inverted bevel gears 33 is disposed in a direction intersecting the main shaft rotation axis 5 (radial direction of the main shaft rotation axis), and a plurality of the main shaft rotation axis 5 can be radially arranged have. Bearings 34a and 34b may be provided at both ends of the shaft 34 of each of the inverted bevel gears 33 for smooth rotation of the shaft 34. [

The inner frame 50 may be installed inside the gear box 40 and the plurality of fixing members 40 may be installed in the gear box 40. In this case, 51 in the body portion 41 by fastening.

48, a through hole 52 through which the spindle rotational shaft 5 passes is formed in the center of the inner frame 50, and a width (width in the longitudinal direction of the spindle rotational shaft) And may be provided in the form of a cylinder or a polygonal column smaller than the maximum outer diameter of the cylinder 33. The inner frame 50 rotatably accommodates each of the inverted bevel gears 33 so that the inverted bevel gears 33 can be meshed with the driven and driven bevel gears 31, And a mounting portion 53. [ The first shaft support portion 54 and the second shaft support portion 55 are provided to support the bearings 34a and 34b provided at both ends of the shaft 34 of the inverted bevel gear 33, respectively. The plurality of inverting bevel gears 33 may be arranged radially with a plurality of through holes 52 as a center.

48, the first and second axially supports 54 and 55 are opened in the direction of one side of the inner frame 50 for mounting the inverted bevel gear shaft 34 . The first fastening member 54a, which covers and fixes the bearings 34a and 34b, may be mounted with the second fastening member 55a. When the inverted bevel gear 33, the shaft 34 of the inverted bevel gear, and the bearings 34a and 34b are assembled when the inverted bevel gear 33 is installed in the inner frame 50, The first and second fastening members 54a and 55a can be fastened and fixed after being installed in such a manner as to enter the gear attachment portion 53 from one side direction of the fastening member 50. [ Here, an example of a method of mounting the inverted bevel gears 33 to the inner frame 50 is presented, but the mounting manner of the inverted bevel gear 33 is not limited thereto. When the shape of the inner frame 50 is changed, the manner in which the inverted bevel gear 33 is mounted on the inner frame 50 may be changed.

The inner frame 50 on which the inverted bevel gears 33 are mounted is rotated by the drive bevel gear 31, the driven bevel gear 32, the front cover 42, the rear cover The plurality of fixing members 51 may be fastened and fixed in the body portion 41 after entering the body portion 41 of the gear box 40 before installing the fixing members 51,

The plurality of fixing members 51 may be provided in the form of a cylindrical pin as shown in Figs. The fixing member 51 is installed so as to penetrate the body portion 41 from the outside of the body portion 41 and into the body portion 41 so that the inner end portion thereof can hold the inner frame 50 in a fixed state . The inner end of the fixing member 51 can enter the fixing groove 56 around the inner frame 50 so that the inner frame 50 can be bound. The outer end of the fixing member 51 can be fixed to the body portion 41 by fastening the fixing screw.

In this gear box 40, after the inverted bevel gear assembly including the inner frame 50 is mounted in the body portion 41, the driven bevel gear 31 and the driven bevel gear 31 are inserted through the openings on both sides of the body portion 41, The rear cover 43, the first linking member 35, and the second linking member 36 can be installed. Therefore, the reverse rotation device 30 can be easily assembled, and the repair of the fault can be easily performed later.

The inverting bevel gear 33 is rotated by the rotation of the driven bevel gear 31 to the driven bevel gear 32 so that the inverted bevel gear 33 is reversed So it does not have to be plural. A small ship with a small driving load would be able to implement its function with only one inverted bevel gear.

2 and 7, the inversion rotating device 30 includes a power connecting device 60 separably connecting the spindle rotational shaft 5 and the first connecting member 35. As shown in Fig. The power coupling device 60 includes a drive flange 61 provided on the spindle rotational shaft 5 in front of the gear box 40, a driven flange 62 provided on the first linking member 35 to face the drive flange 61, A friction member 63 interposed between the drive flange 61 and the driven flange 62, and a plurality of connection bolts 64 for fastening the drive flange 61 and the driven flange 62 in a penetrating manner. The drive flange 61 may be integrally formed with the spindle rotational shaft 5 or separately manufactured and then fixed to the spindle rotational shaft 5 by welding or the like. The driven flange 62 may be provided integrally with the first linking member 35. The friction member 63 may be in the form of a plurality of semicircular segments so that the connecting bolt 64 can be unscrewed and then separated radially outward.

The power connection device 60 can cut off the power connection between the drive flange 61 and the driven flange 62 by releasing the plurality of connection bolts 64 and separating the friction member 63 as necessary. For example, when failure of the anti-rotation device 30 occurs during operation of the ship, power transmission from the main shaft rotation shaft 5 to the first connection member 35 can be blocked. In this case, the ship can be operated only by the operation of the rear propeller 20.

The second connecting member 36 has a connecting flange 37 connected to the hub 11 of the front propeller 10 at the rear end thereof. The connecting flange 37 may be integrally formed with the second connecting member 36 and fixed to the front surface of the hub 11 of the front propeller 10 by fastening a plurality of fixing bolts 37a. Therefore, the rotation of the driven bevel gear 32 can be transmitted to the front propeller 10 by the second connecting member 36. [

A third support ring 38a and a fourth support ring 38b may be provided between the second linking member 36 and the outer surface of the main firing biaxial portion 5 to support the rear inner bearing 46. The third support ring 38a is interposed between the inner ring of the rear inner bearing 46 and the inner ring of the first thrust bearing 13 so that the gap therebetween can be maintained. The fourth support ring 38b may be installed on the inner surface side of the second connecting member 36 so as to support the outer ring of the rear inner bearing 46. [ A fixing ring 39 may be mounted on the rear end of the second linking member 36 to prevent the fourth support ring 38b from being separated. The retaining ring 39 can support the outer ring of the first thrust bearing 13, as shown in Figs.

When the main shaft rotation shaft 5 rotates, the first linking member 35 rotates and the drive bevel gear 31 connected to the first linking member 35 rotates. The rotation of the driven bevel gear 31 is inverted by the plurality of inverted bevel gears 33 and then transmitted to the driven bevel gear 32 so that the driven bevel gear 32 rotates in the direction opposite to the driven bevel gear 31. [ The rotation of the driven bevel gear 32 is transmitted to the front propeller 10 by the second linking member 36. Therefore, it is possible to realize the opposite rotation of the front propeller 10 and the rear propeller 20.

As described above, since the inversion rotating device 30 of the present embodiment implements the mutual inversion of the two propellers 10, 20 through the plurality of bevel gears 31, 32, 33, the volume of the two propellers 10, Can be reduced. Therefore, the volume of the gear box 40 installed in the rear hull 3 can be minimized.

The conventional planetary gear type inverting rotary device has a relatively large volume because it includes a sun gear installed on the spindle rotary shaft, a planetary gear provided outside the sun gear, and a cylindrical internal gear installed outside the planetary gear. In the planetary gear type reverse rotation device, since the internal gear disposed at the outermost periphery needs to rotate, considering the casing on the outside, the volume becomes very large. Therefore, it is practically very difficult to install it in the rear of the hull as in the case of the present embodiment. Even if it is installed at the back of the hull, there arises a problem of increasing the size of the rear of the hull.

2, the propulsion device of the present embodiment includes a first seal (not shown) for sealing between the hull 3 of the hull 3 and the hub 11 of the front propeller 10 to prevent intrusion of seawater Device 90 and a second sealing device 110 for sealing between the hub 11 of the front propeller 10 and the hub 21 of the rear propeller 20 for the same purpose.

FIG. 10 is a sectional view of the first sealing device of the propulsion device according to the embodiment of the present invention, and FIG. 11 is an exploded perspective view of the first sealing device of the propulsion device according to the embodiment of the present invention.

910, the first sealing device 90 includes a cylindrical first lining 91 provided on a connecting flange 37 of a second connecting member 36 fixed to the front of the front propeller hub 11, And a cylindrical first sealing member 92 which covers the outer surface of the first lining 91 so as to be in contact with the outer surface of the first lining 91 and whose one end is fixed to the rear cover 43.

The first sealing member 92 includes a plurality of packings 93a, 93b and 93c spaced apart from each other on the inner surface facing the first lining 91 and in contact with the outer surface of the first lining 91, , 93b, 93c) for supplying a fluid for sealing. The oil passage 95 of the first sealing member 92 is connected to the lubricating oil supply passage 96 passing through the front and rear covers 42 and 43 of the gear box 40 so that lubricating oil having a predetermined pressure can be supplied (See FIG. 2). The lubricating oil having a pressure is supplied to the grooves between the respective packings 93a, 93b and 93c so that the respective packings 93a, 93b and 93c are pressed against the first lining 91 to come in close contact with each other, have.

101, the first lining 91 may be composed of a first member 91a and a second member 91b which are divided into semicircles on both sides. The packing 91d can be interposed in the mutually divided portions 91c of the first and second members 91a and 91b so that sealing can be performed when they are mutually coupled. A first binding portion 91e protruding from one side of the first member 91a is provided on the divided partial free end side of the first member 91a and a second binding portion 91b protruding from the other side of the second binding portion 91b, And a fixing bolt 91g is fastened thereto, so that both sides can be firmly coupled to each other. The flange portion 91h fixed to the connection flange 37 can be firmly fixed to the hub 11 by fastening a plurality of fixing bolts 91i. The first lining 91 is not limited to the first lining 91 but may be divided into a first member 91a and a second member 91b. And the member 91b may be integrally connected to each other.

A plurality of rings 92a, 92b and 92c made in a semicircular shape may be stacked in the longitudinal direction of the main shaft rotation shaft 5 from the outside of the first lining 91 to fix the first sealing member 92 . The plurality of rings 92a, 92b, 92c may be joined together by bolting or welding.

12 is a sectional view of the second sealing device of the propulsion device according to the embodiment of the present invention.

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

The oil passage 115 of the second sealing member 112 can communicate with the lubricating oil supply passage 120 provided at the center of the main shaft rotating shaft 5. [ The main shaft rotation shaft 5 is formed with a first connection channel 121 in the radial direction for connecting the lubricating oil supply passage 120 and the inner space 122 of the second lining 111. The front propeller hub 11, A second connection channel 123 may be formed to communicate the inner space 122 of the second lining 111 and the channel 115 of the second sealing member 112. [ Therefore, the lubricant supplied from the central portion of the main shaft rotating shaft 5 to the second sealing member 112 can press the packings 113a, 113b, and 113c, thereby achieving the sealing.

The second lining 111 and the second sealing member 112 are each formed in a semicircular shape like the first lining 91 and the first sealing member 92 of the first sealing device 90, It may be a method of combining after installation.

2 and 5, the front propeller 10 has a ring-shaped (not shown) mounted on the rear side of the hub 11 for sealing a gap between the outer surface of the spindle rotational shaft 5 and the inner surface of the hub 11 And includes a first sealing cover 71. The first sealing cover 71 is provided with a sealing member 71a for enhancing the adhesion to the inner peripheral surface of the main shaft rotating shaft 5 in contact with the outer surface thereof. The first sealing cover 71 can prevent the seawater from flowing into the gear box 40 even if the seawater intrudes into the second space 111 of the second lining 111 due to a failure of the second sealing device 110 have. That is, the first sealing cover 71 can prevent the seawater intrusion toward the gear box 40 more reliably by implementing the secondary barrier.

2, the driven flange 62 in front of the gear box 40 is provided with a similar form to the first sealing cover 71 described above for sealing between the driven flange 62 and the outer surface of the main shaft rotation axis 5 2 sealing cover 72 may be provided. The second seal cover 72 can prevent the lubricating oil filled in the gear box 40 from leaking toward the hull 1.

The reverse rotation device 30 includes a front sealing cover 73 sealingly covering the front bearing 44 between the front cover 42 and the first connection member 35, And a rear seal cover 74 that sealably covers the rear side of the rear outer bearing 45 between the members 36. [ The front and rear sealing covers 73 and 74 may also be provided in a similar form to the first sealing cover 71 described above.

The front seal cover 73 and the rear seal cover 74 can prevent the lubricating oil inside the gear box 40 from leaking out of the gear box 40. [ In the same way as the first sealing cover 71, the rear sealing cover 74 prevents the seawater from flowing into the gear box 40 even if the seawater intrudes into the space inside the first lining 91 due to the failure of the first sealing device 90 It is also possible to function as a secondary barrier.

 The propulsion device of this embodiment may include a second radial bearing 81, a third thrust bearing 82 and a fourth thrust bearing 83 which support the main shaft rotation shaft 5 in front of the gear box 40 have. The second radial bearing 81 can be fixed to the first bearing support portion 86 inside the hull 1 while being accommodated in the first bearing case 84. [ The third and fourth thrust bearings 82 and 83 can also be fixed to the second bearing support 87 inside the hull 1 in a state where the respective inner rings are supported by the second bearing case 85 in a mutually- have.

The second radial bearing 81 supports the spindle rotational shaft 5 in front of the gear box 40 to prevent radial vibration or shaking of the spindle rotational shaft 5. [ The third and fourth thrust bearings 82 and 83 function to transmit the axial force transmitted from the front and rear propellers 10 and 20 to the spindle rotational shaft 5 toward the hull 1. Particularly, the third thrust bearing 82 functions to transmit the force acting in the forward direction from the spindle rotational shaft 5 to the hull 1 when the ship is advanced, and the fourth thrust bearing 83 functions to rotate the main shaft And functions to transmit a force acting in the stern direction from the rotary shaft 5 to the hull 1.

2, reference numeral 131 denotes a first covering ring covering between the rear hull 3 and the front propeller hub 11 outside the first sealing device 90 and 132 denotes a front propeller hub outside the second sealing device 110. [ (11) and the rear propeller hub (21). The first cover ring 131 is fixed to the rear hull 3 and is installed in such a manner as to be slightly spaced from the hub 11 of the front propeller or is disposed slightly spaced from the rear hull 3, 11 and rotate together with the forward propeller 10. The second cover ring 132 can be rotated together with the fixed side fixed to either the hub 11 of the forward propeller or the hub 21 of the rear propeller.

Next, a method of manufacturing the propulsion device according to the present embodiment and installing the propulsion device on the hull will be described.

As shown in Fig. 7, when the propulsion device is installed, the main shaft rotation shaft 5 is assembled with the gear box 40 and related parts constituting the reversing rotating device 30 before mounting the propulsion device on the hull 1. A driving bevel gear 31, a driven bevel gear 32, a first connecting member 35, and a second connecting member 35. The inner frame 50 includes a body 41, an inverted bevel gear 33, The front cover 42, the front bearing 44, the second connecting member 36, the rear cover 43, the rear outer bearing 45, the rear inner bearing 46, and the stationary ring 39 are assembled . The first lining 91 and the first sealing member 92 of the first sealing device 90 are also installed between the connecting flange 37 of the second connecting member 36 and the rear cover 43.

Such a reverse rotation device 30 can be assembled after machining each part in a separate manufacturing factory, and thus it is possible to manufacture precisely. In addition, since the first sealing device 90 to be installed after installation of the front propeller 10 can be previously mounted on the inversion rotating device 30 in the normal case, the operation of installing the propelling device on the subsequent ship 1 is simplified can do.

The rear inner bearing 46 and the stationary ring 39 may be assembled when the reverse rotation device 30 is manufactured. However, in the process of mounting the reverse rotation device 30 in the installation space 4, As shown in FIG.

The spindle rotary shaft 5 and the reverse rotation device 30 assembled at the manufacturing factory can be moved to a dock or the like for manufacturing the hull 1 by using the transportation means and then mounted on the rear end 3 of the hull 1. In this case, a lifting device such as a crane capable of lifting the assembly of the reversing rotating device 30 can be used. The gear box 40 of the reverse rotation device 30 is first slidably moved from the rear of the hull 1 to the installation space 4 of the rear hull 3 of the hull 3 when the reverse rotation device 30 is mounted. Then, the center of the main spindle 5 is aligned with the center of the main drive shaft 6.

8, the front fixing member 48a and the front fixing member 48b are respectively provided on the front and rear sides of the gear box 40, And the rear fixing member 48b are provided to fix the gear box 40 to the rear hull 3 of the hull. The front and rear fixing members 48a, 48b may be in the form of a plurality of divided parts. The front and rear fixing members 48a and 48b can be fixed to the structure of the gear box 40 and the hull rear 3 by fastening a plurality of fixing bolts.

The rear fixing member 48b can be mounted by approaching from the rear of the hull 1 and the front fixing member 48a can be mounted by the operator in the vicinity of the inside of the hull 1. The inversion rotating device 30 mounted in such a manner as to enter the installation space 4 of the hull rear 3 can separate the inversion rotating device 30 from the hull 1 when a failure or the like occurs in the future, The fault can be repaired in the state. Therefore, fault repair can be easily performed.

The present embodiment exemplifies the case where the front fixing member 48a and the rear fixing member 48b are fastened to the front and back of the gear box 40 for firm fixing of the gear box 40, The outer surface of the gear box 40 is retained on the inner surface of the installation space 4 when the gear box 40 is moved into the installation space 4. Therefore, the gear box 40 can be fastened only to the rear fixing member 48b, (3).

After fixing the gear box 40 to the rear hull 3, the main drive shaft 6 and the main shaft rotation shaft 5 are connected by a coupling device 7 and the second radial bearing 81, and third and fourth thrust bearings 82, 83 so that the spindle rotational shaft 5 can be supported by the hull 1.

1 and 2, the front propeller 10, the rear propeller 20, and related components are attached to the main shaft rotation shaft 5 after the reverse rotation device 30 is mounted on the rear end 3 of the hull. And the installation of the propulsion device can be completed by mounting the second sealing device 110. [

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

The propulsion device is constructed such that when the spindle rotational shaft 5 rotates by the operation of the internal drive source 8 of the hull 1, the rear propeller 20 directly connected to the rear end of the spindle rotational shaft 5 rotates in the same direction as the spindle rotational shaft 5 Rotate together. At the same time, the drive bevel gear 31 of the reverse rotation device 30 is also fixed to the spindle rotational shaft 5, so that it rotates together with the spindle rotational shaft 5. The rotation of the driven bevel gear 31 is reversed by the plurality of inverted bevel gears 33 and is transmitted to the driven bevel gear 32 so that the driven bevel gear 32 rotates in the direction opposite to the main shaft rotation axis 5. Therefore, the front propeller 10 connected by the driven bevel gear 32 and the second connecting member 36 rotates in the direction opposite to the rear propeller 20.

The forward propeller 10 and the rear propeller 20, which rotate in opposite directions, generate propelling water in the same direction because their blade angles are opposite to each other. In other words, when the ship moves forward, the propulsion water is generated backward, and when the ship is backward, the propulsion water is generated forward while rotating in the reverse direction. In addition, the propulsion performance of the propulsion water generated when advancing is improved because propulsion power of the fluid through the front propeller 10 is recovered by the propeller 20 while the propeller 20 is rotating in the reverse direction. The same goes for backward.

On the other hand, since the forward propeller 10 generates propelling water backward when it is advanced, it receives a reaction force corresponding thereto. This force is transmitted to the spindle rotary shaft 5 through the second thrust bearing 14 and acts as propulsive force. The rear propeller 20 is also subjected to a reaction force because it generates propellant water rearwardly when it is advanced. This force is also transmitted to the direct spindle rotary shaft 5 and acts as propulsive force.

The propulsion force of the front propeller 10 is transmitted to the main shaft rotation shaft 5 through the first thrust bearing 13 and the propulsion force of the rear propeller 20 is also transmitted to the main shaft rotation axis 5 directly connected to the ship.

As a result, the propulsion device of the present embodiment transmits the propulsive force generated by the operation of the front propeller 10 and the rear propeller 20 to the spindle rotational shaft 5 when the ship moves forward and backward. The propulsion force transmitted to the main shaft rotation shaft 5 is transmitted to the hull 1 through the third and fourth thrust bearings 82 and 83 so that propulsion of the hull 1 is performed.

1: hull, 3: hull,
4: installation space, 6: main drive shaft,
7: coupling device, 10: forward propeller,
13: first thrust bearing, 14: second thrust bearing,
15: first radial bearing, 16: wedge member,
20: rear propeller, 30: reverse rotation device,
31: driven bevel gear, 32: driven bevel gear,
33: inverted bevel gear, 35: first connecting member,
36: second connecting member, 37: connecting flange,
40: gear box, 41: body part,
42: front cover, 43: rear cover,
44: front bearing, 45: rear outer bearing,
46: rear inner bearing, 50: inner frame,
60: Power connection device, 61: Driving flange,
62: driven flange, 63: friction member,
71: first sealing cover, 72: second sealing cover,
73: front sealing cover, 74: rear sealing cover,
81: second radial bearing, 82: third thrust bearing,
83: fourth thrust bearing, 90: first sealing device,
110: Second sealing device. 200:
220: first shaft portion, 230: second shaft portion,
232: first step portion, 240: third shaft portion,
242: second step portion, 250: first taper portion,
260: second tapered portion.

Claims (12)

1. A rotary shaft for propelling a ship, which is equipped with a rear propeller and a front propeller rotating in reverse to the rear propeller,
A first shaft portion having a diameter smaller than an inner diameter of a first bearing formed at the rear of the rotary shaft and rotatably supporting the front propeller with respect to the rotary shaft,
A rear propeller fixing part having a hub of the rear propeller so that the diameter of the rear propeller is reduced in a stern direction of the first shaft part,
A first tapered portion extending in the fore-and-aft direction from the first shaft portion and having a larger diameter,
And a second shaft portion extending in the fore-going direction in the first tapered portion and having a diameter corresponding to the inner diameter of the first bearing and to which the first bearing is fixed. The method according to claim 1,
And the second shaft portion includes a first step portion that axially supports the first bearing. 3. The method of claim 2,
And a third shaft portion extending from the first step portion and having a larger diameter than the second shaft portion and to which the second bearing is fixed. The method of claim 3,
And a second tapered portion provided between the second shaft portion and the third shaft portion and extending in the fore-going direction and having a larger diameter. 5. The method of claim 4,
And a second stepped portion provided on the third shaft portion and axially supporting the second bearing. A rotating shaft,
A rear propeller fixed to the rotary shaft,
A front propeller rotatably supported on the rotary shaft in front of the rear propeller,
A reverse rotation device for inverting and transmitting the rotation of the rotary shaft to the front propeller,
And a first bearing which supports the front propeller so as to be rotatable reversely with respect to the rotation shaft,
Wherein the rotary shaft includes a first shaft portion having a diameter smaller than an inner diameter of the first bearing, a first tapered portion extending in the fore direction in the first shaft portion and having a larger diameter, And a second shaft portion on which the first bearing is mounted,
Wherein the first bearing is inserted into the rotary shaft through the rear of the rotary shaft and mounted to the second shaft portion via the first shaft portion and the first taper portion. The method according to claim 6,
Wherein the rotary shaft is formed at a stern end portion of the first shaft portion, and a hub of the rear propeller is press-fitted into the rear propeller fixing portion. 8. The method according to claim 6 or 7,
Wherein the rotary shaft includes a first stepped portion provided on the second shaft portion and axially supporting the first bearing. 9. The method of claim 8,
A connecting member for transmitting the power of the inverting rotating device to the front propeller, and a second bearing for rotatably supporting the connecting member to the rotating shaft,
The rotary shaft further includes a second tapered portion extending in the fore-mentioned direction from the first stepped portion and having a larger diameter, and a third shaft portion extending from the second tapered portion and fixed to the second bearing, Ship propulsion system. 10. The method of claim 9,
And a second stepped portion provided on the third shaft portion and axially supporting the second bearing. The method according to claim 6,
The first bearing includes a first thrust bearing disposed between a front inner surface of the hub of the forward propeller and an outer surface of the second shaft portion and a second thrust bearing disposed adjacent to a rear side of the first thrust bearing, Ship propulsion system. The method according to claim 6,
Wherein the reverse rotation device includes a gear box accommodated in an installation space formed at the rear of the hull, a drive gear connected to the rotation shaft inside the gear box so as to rotate together, And one or more reversing gears for reversing the rotation of the driving gear to the driven gear and transmitting the inverted gear to the driven gear.

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