KR101732666B1 - Marine propulsion system having counter rotating propeller - Google Patents

Abstract

A marine propulsion system with dual inversion propellers is disclosed. The marine propulsion system includes bevel gears; A first hub having at least one first propeller attached to an outer circumferential surface thereof and having a first oblique thread engaged with the bevel gear at one side; And at least one second propeller is attached to the outer circumferential surface, and a receiving groove for receiving the bevel gear is continuously formed on an inner circumferential surface thereof. The receiving groove is formed on one side of the bevel gear so as to face the first oblique thread, And a second hub having a second oblique thread formed thereon.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a propulsion system for a marine propulsion system having a double-

The present invention relates to a marine propulsion system having a dual inversion propeller.

Generally, the ship is moved using the thrust generated by the propeller. The propeller is subject to loss of rotational energy during rotation to generate thrust, and a counter-rotating propulsion system (CRP) is applied to the propeller to reduce the loss of such rotational energy.

The dual inversion propulsion system is a concept of recovering the kinetic energy of the rotational direction provided by the propeller to the fluid, and it is possible to arrange a pair of propellers rotating in mutually opposite directions to face each other. When applied to a ship propulsion system, it is possible to improve the propulsion efficiency by recovering rotational energy of the discarded rotating electric current.

Conventionally, in order to implement a dual inversion propulsion system, a double shaft is used and a rotation of the solid shaft is fixed to the hull by using a planetary gear to rotate the external hollow shaft, or the double shaft is used to rotate the solid shaft And a method of rotating the outer hollow shaft by inverting the direction of rotation using a bevel gear having a fixed point on the hull. Korean Patent Laid-Open Publication No. 2014-0049733 and Korean Laid-Open Patent No. 10-2012-0139248 are also disclosed as a structure in which such a structure is partially improved.

1 of the prior art ship propulsion device disclosed in Korean Patent Laid-Open Publication No. 2014-0049733, a ship propulsion device includes a pair of propellers 110 disposed opposite to each other, a pair of propellers 100 And a bevel gear 130 for providing a rotational force in the opposite direction to the pair of ring gears 120. The pair of ring gears 120,

When the drive shaft is rotated in one direction by the operation of the drive motor 140, the bevel gear 130 is rotated by the rotation of the drive shaft to rotate the pair of ring gears 120, which are threadedly coupled, , The propeller 110 is rotated forward or backward by the rotation of the ring gear 120, respectively.

As described above, conventionally, a structure has been employed in which a pair of propellers are rotated forward or backward by transmitting a force using a planetary gear or a bevel gear. However, in the conventional structure, the shaft for rotating the propeller and the propeller has a relatively large movement with respect to the hull, and the problem is that it is almost impossible for the propeller to achieve stable alignment because the movement of the bevel gear, there was.

Korean Patent Laid-Open Publication No. 2014-0049733 (Ship propulsion device) Korean Patent Laid-Open No. 10-2012-0139248 (Propulsion device of a ship and a ship equipped with the same)

The present invention relates to a propulsion system for a ship having a double inverted propeller which is provided in a propeller itself and uses a bevel gear which freely moves as a rotational force transmitting means to ensure economical efficiency and ease of use, .

Other objects of the present invention will become readily apparent from the following description.

According to an aspect of the present invention, a bevel gear, A first hub having at least one first propeller attached to an outer circumferential surface thereof and having a first oblique thread engaged with the bevel gear at one side; And at least one second propeller is attached to the outer circumferential surface, and a receiving groove for receiving the bevel gear is continuously formed on the inner circumferential surface thereof. The receiving groove is continuously formed on one side of the bevel gear and opposed to the first oblique thread, And a second hub having a second oblique thread formed thereon.

A drive shaft that provides a rotational force may be fixedly coupled to either the first hub or the second hub.

The first oblique thread, the bevel gear, and the second oblique thread may be formed so that the rotating directions of the first hub and the second hub are reversed.

The bevel gear may be revolved along a path formed by the receiving groove around the driving shaft.

A plurality of bevel gears can be accommodated in the receiving groove at the same time.

Other aspects, features, and advantages will become apparent from the following drawings, claims, and detailed description of the invention.

According to the embodiment of the present invention, by using a bevel gear, which is a rotational force transmitting means provided in the propeller itself for realizing double inversion, it is possible to secure economical efficiency and ease of use and to easily solve the alignment problem between the propellers There is an effect that can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of a ship propulsion device according to the prior art; FIG.
2 shows a configuration of a propulsion system for a ship having a dual inversion propeller according to an embodiment of the present invention.
3 is a view for explaining an operational state of a propulsion system for a ship having a dual inversion propeller according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It is to be understood that the components of the embodiments described with reference to the drawings are not limited to the embodiments and may be embodied in other embodiments without departing from the spirit of the invention. It is to be understood that although the description is omitted, multiple embodiments may be implemented again in one integrated embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 2 is a view showing the construction of a propulsion system for a ship having a dual inversion propeller according to an embodiment of the present invention. FIG. 3 is a view showing an operation state of a propulsion system for a ship having a double inversion propeller according to an embodiment of the present invention. Fig.

2, the double-inverted propeller according to the present embodiment includes a first hub 215 (see FIG. 2 (a)) rotated in correspondence with the rotation of a fixedly connected drive shaft 210, a first hub 215 A bevel gear 230 (see FIG. 2 (b)) which is engaged with the oblique thread 225 and receives the rotational force of the first hub 215, a hollow formed through the drive shaft 210, A second hub 240 (see FIG. 2 (c)) which is rotated by receiving a rotational force from the bevel gear 230 is formed with a second oblique thread 250 which is engaged with the gear 230.

The drive shaft 210 is fixed to a drive motor (not shown) provided in the hull to generate a rotational force so that the rotational force generated by the drive motor 210 is transmitted to the first hub 215 by the drive shaft 210, Whereby the first hub 215 is rotated. The rotational force of the first hub 215 is transmitted to the second hub 240 by the bevel gear 230.

A first oblique thread 225 is formed in the first hub 215 for threading and a thread is formed corresponding to the bevel gear 230 and a second oblique thread 234 corresponding to the second hub 240 250 are formed. At this time, each of the threads transmits the rotational force of the first hub 215 to the second hub 240, and the rotational direction of the second hub is opposite to that of the second hub.

2, the driving shaft 210 is fixedly coupled to the first hub 215 located relatively far from the driving motor. However, the driving shaft 210 may be connected to the second hub 240 disposed close to the driving motor And the rotational force of the second hub 240 may be configured to be transmitted to the first hub 215 by the bevel gear 230. [ In this case, the first hub 215 may be formed with a groove to be supported by the driving shaft 210.

One or more first propellers 220 may be fixedly coupled to the outer circumferential surface of the first hub 215 and one or more second propeller 220 may be fixedly coupled to the outer circumferential surface of the second hub 240 to face the first propeller 220. [ The propeller 245 may be fixedly coupled.

An end region of the bevel gear 230 is inserted into the inner circumferential surface of the second hub 240 and the inserted bevel gear 230 is coupled to the driving shaft 210 (FIG. 2 (c) And a receiving groove 255 functioning as an idle orbit is formed in a continuous manner so as to be rotatable around the center of the receiving groove 255.

The receiving groove 255 may be formed in a shape to fix the inserted bevel gear 230 so as not to be detached from the receiving groove 255 and two or more bevel gears 230 may be inserted into the receiving groove 255 have.

The gap between the first hub 215 and the second hub 240 when the first hub 215 and the second hub 240 are coupled to each other with the bevel gear 230 interposed therebetween is, And the like.

In addition, between the first hub 215 and the second hub 240 and between the second hub 240 and the drive shaft 210, forward and backward movement between the hubs is limited, but in order to allow relative rotation, It is of course also possible to provide a bearing device (e.g., one or more of rolling bearings, lubricated journal bearings, radial bearings, etc.).

A bearing (for example, one or more of a guide bearing, a rolling bearing, and the like) is provided so that the bevel gear 230 inserted into the receiving groove 255 can be easily revolved along the path formed by the receiving groove 255 And may be installed in the receiving groove 255.

Hereinafter, an operational process of the propulsion system for a ship having a double inverted propeller according to the present embodiment will be described with reference to FIG.

3 (a), when the drive shaft 210 is rotated in the direction ①, the first hub 215 and the first propeller 220 are rotated in the direction of ① by the rotation of the drive shaft 210 . As another example, if the drive shaft 210 is fixedly coupled to the second hub 240, it is natural that the second hub 240 and the first propeller 245 will be rotated in the direction ①.

When the first hub 215 is rotated in the direction of ①, the bevel gear 230 engaged with the first oblique thread 225 formed on the first hub 215 is rotated in the ② direction And the rotational force of the bevel gear 230 is transmitted to the second hub 240 having the second oblique thread 250 which is engaged with the bevel gear 230 . At this time, the rotational force transmitted to the second hub 240 is the rotational force in the direction of?, And is a rotational force in the direction opposite to the rotational force in the direction?, Thereby realizing a double inversion effect.

For example, when the pitch direction of the first and second propellers is determined, the first propeller 220, which is located relatively to the rear side for advancing the ship, rotates clockwise as viewed from the rear to the front, In this case, the second propeller 245 is subjected to counterclockwise rotational force by the inflow fluid, and additionally receives a counterclockwise rotational force by the rotational force transmitted by the bevel gear 230, .

If the rotating force of the first hub 215 is transmitted to the second hub 240 so that the absolute value of the angle of rotation of the first hub 215 and the absolute value of the angle of rotation of the second hub 240 The bevel gear 230 is rotated in the direction of the driving shaft 210 along the path formed by the receiving groove 255 formed on the inner circumferential surface of the second hub 240 as shown in FIG. It can be maintained at the existing position without revolving around the center.

However, in an actual situation, it is general that the absolute value of the rotated angle of the first hub 215 does not match the absolute value of the rotated angle of the second hub 240, 2 hub 240 along the path formed by the receiving groove 255 formed on the inner circumferential surface of the hub 240.

Even when the rotation angle between the first hub 215 and the second hub 240 is disagreed by the idle operation of the bevel gear 230 inserted into the receiving groove 255 as described above, And it is also advantageous that the problem of alignment due to the hull fixing point, which was a problem of the related art, can be solved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

110: Propeller 120: Ring gear
130, 230: Bevel gear 140: Drive motor
210: drive shaft 215: first hub
220: first propeller 225: first oblique thread
240: second hub 245: second propeller
250: second oblique thread 255: receiving groove

Claims (5)

Bevel gear;
A first hub having at least one first propeller attached to an outer circumferential surface thereof and having a first oblique thread engaged with the bevel gear at one side; And
One or more second propellers are attached to the outer circumferential surface, a receiving groove for receiving the bevel gear is continuously formed on the inner circumferential surface thereof, and one side of the bevel gear is opposed to the first oblique thread and is engaged with the bevel gear And a second helical threaded second hub,
Wherein a driving shaft for providing a rotational force is coupled to either the first hub or the second hub and the bevel gear is revolved along a path formed by the receiving groove about the driving shaft. delete The method according to claim 1,
Wherein the first oblique thread, the bevel gear, and the second oblique thread are formed so that the rotating directions of the first hub and the second hub are reversed. delete The method according to claim 1,
And a plurality of bevel gears are accommodated in the receiving groove at the same time.

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