KR20140131767A - A rudder for a ship - Google Patents

Abstract

The rudder main body includes a rudder body rotatably installed at the rear of the propeller, and a rudder bulb installed at the rudder body. The rudder bulb has an asymmetrical shape at the left and right ridges, Thereby reducing the frictional resistance of the rudder bulb to the wake of the propeller and improving the propulsion efficiency of the propeller.

Description

{A RUDDER FOR A SHIP}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a marine rudder, and more particularly, to a marine rudder capable of improving propelling efficiency of a propeller by forming a structure in which right and left sides of a rudder body are twisted.

In general, ships use rudders as means for adjusting the direction of travel.

Such a marine rudder comprises a rudder body rotatably mounted on the hull at the rear of the propeller and a rudder bulb installed in the rudder body.

When the rudder body rotates at a certain rudder angle and has a certain angle of attack in the flow of fluid, the vertical component of the lift acting on the rudder body is the tangent force Lt; / RTI >

In the prior art, cavitation occurs due to the characteristic of the wake of the propeller, that is, the resistance acting on the rudder due to the rotation of the propeller due to the rotation of the propeller, and the lift acting on the rudder is opposite to each other, The shape of the rudder has been improved due to the problem that the lateral force is lowered.

However, in the prior art, since the rudder bulb is formed in a bilaterally symmetrical shape, there is a problem that the wake of a propeller having an asymmetric flow velocity distribution can not be effectively rectified.

Korean Registered Patent No. 10-1159205 (Jun. 18, 2012) International Publication No. WO 2006/112787 (October 26, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rudder for a marine vessel which can improve propulsion efficiency of a propeller by using a rudder body as a twisted structure.

In order to achieve the above object, the present invention provides a rudder structure comprising: a rudder body rotatably installed on a hull at a rear side of a propeller; and a rudder bulb installed in the rudder body, wherein the rudder bulb has an asymmetrical shape, The rudder body has a twisted structure in the vertical direction.

In addition, in the present invention, it is preferable that the rudder body is formed such that the twisted angle becomes gradually larger toward the upper and lower direction with respect to the center portion.

Further, in the present invention, it is preferable that the rudder body is twisted left and right by 5 degrees with respect to a vertical line.

Further, in the present invention, it is preferable that the gradient of the port is 1 to 30 degrees with respect to the bulb axis, and the gradient of the star is 0 to 15 degrees with respect to the bulb axis.

As described above, the present invention improves the structure of the rudder bulb to an asymmetrical shape, thereby reducing the frictional resistance of the rudder bulb to the wake of the propeller and improving the propelling efficiency of the propeller.

1 is a partial side view of a ship including a ship rudder according to the present invention.
2 is a plan view of a marine rudder according to the present invention.
3 shows a cross-sectional view of a rudder bulb according to the present invention.
4 is a side view of a rudder body according to the present invention.
5 is a front view of a rudder body according to the present invention.

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

FIG. 1 is a partial side view of a ship including a ship rudder according to the present invention, FIG. 2 is a plan view of a ship rudder according to the present invention, and FIG. 3 is a sectional view of a rudder bulb according to the present invention.

1, the present invention relates to a marine rudder mounted on the rear portion of a ship 1, including a rudder body 20 and a rudder bulb 30. As shown in Fig.

When the propeller 10 is driven by the drive shaft 11, the propeller 10 propels the ship 1 forward in the direction of the arrow.

When the ship 1 is propelled forward by the propeller 10, the water passing through the propeller 10 is directed to the rotatable rudder body 20 located downstream of the propeller 10, that is, behind the propeller 10 To the rear.

A rudder body (20) is mounted on a rotatable rudder stock (21) to control the position of the rudder body (20).

The propeller 10 is equipped with a plurality of blades mounted on the hub 12 facing the rudder bulb 30.

The rudder bulb 30 is integrally formed with the rudder body 20, and is installed with a certain gap from the hub 12.

Here, the rudder bulb 30 has asymmetrical shape of the port 31 and the star 32 with respect to the bulb axis P (see Fig. 2).

The asymmetry of the port 31 and the starboard 32 becomes increasingly more toward the rudder body 20 with respect to the front end portion 33.

That is, the port 31 and the star 32 form a semicircular symmetrical shape at the tip portion 33, and each have an elliptical shape facing the rudder body 20, and their elliptical shapes are asymmetrical with respect to each other.

Here, the right-side bulb angle?, Which is the slope of the starboard, is 0 to 15 degrees with respect to the first reference line P1, and the left-side bulb angle? ~ 30 °.

That is, the right-side bulb angle? Is smaller than the left-side bulb angle?.

The starboard 32 of the rudder bulb 30 is brought into contact with the rudder body 20 at the point J1 and the rudder angle of the rudder bulb 30 The port 31 is brought into contact with the rudder body 20 at the point J2, thereby forming an asymmetric shape as a whole.

As described above, the port 31 and the star 32 of the rudder bulb 30 are formed asymmetrically with each other, so that the port 31 of the rudder bulb 30 is formed to have a relatively smaller area than the starboard 32 do.

Therefore, the wake velocity of the propeller 10 has a relatively higher velocity distribution than that of the starboard 32 at the port 31, and the frictional resistance is reduced.

The propeller 10 is rotated in one direction.

The wake of the propeller is oriented in correspondence with the rotation of the propeller 10 and the rudder bulb 30 also has an asymmetrical shape corresponding to the direction of this wake so that the overall frictional resistance of the rudder bulb 30 against the wake is reduced .

Here, the front end portion 33 refers to the portion of the rudder bulb 30 facing the propeller 10.

The distal end portion 33 is provided with a tapered portion 34 which is a tapered inclined surface.

It is preferable that the hub 12 of the propeller 10 facing the front end portion 33 is also tapered.

It is preferable that the distal end portion 33 and the hub 12 are located on the same axial line.

The asymmetric shape of the rudder bulb 30 will be described in more detail as follows.

The shape of the cross section of the rudder bulb 30 is a symmetrical circular shape on the side of the propeller 10, and asymmetry becomes larger toward the rudder body 20 (see Fig. 3).

In the rudder bulb 30, the cross-section A of the leading end portion 34 is circular and the cross-section C close to the rudder body 20 has greater asymmetry between the port 31 and the starboard 32 .

That is, the asymmetry of the rudder bulb 30 is A <B <C.

Here, the inclination degrees of the port 31 and the star 32 are as described above.

Next, look at the rudder body structure.

FIG. 4 is a side view of the rudder body according to the present invention, and FIG. 5 is a front view of the rudder body according to the present invention.

As shown in Figs. 4 and 5, the rudder body 20 is twisted to the upper right side and the lower left side with respect to the center portion.

Referring to each cross section of the rudder body 20, the first rudder body section 61, which is a cross-section of the central portion, has a symmetrical structure with respect to the horizontal line 200.

However, the rudder body 20 forms a twisted structure at an angle to the upper right and lower left directions, respectively.

The rudder body 20 is gradually twisted to the upper right side and the lower left side with respect to the vertical line 100 of the center portion.

4 and 5, the symbol? Indicates the right twist angle in which the center portion 41 of the distributor body and the right body portion 43 of the rudder body twist are twisted to the right, and symbol δ indicates the center of the reporter body 41, The twist left side portion 42 indicates the left twist angle twisted to the left.

The second rudder body section 62 is a section 5 ° twisted to the upper right and the third rudder body section 63 is section 5 ° twisted to the lower left.

Accordingly, the propeller 10 is rotated in one direction, and the wake of the propeller is rectified to the twisted rudder body 20, thereby reducing the overall frictional resistance.

The present invention is not limited to the above-described embodiments, and many modifications may be made by those skilled in the art without departing from the scope of the present invention.

1: Ships
10: Propeller
11: rudder stock
12: Hub
20: rudder body
21: rudder stock
30: Rudder bulb
31: port side
32: starboard side
33:
34: Tapered part
40: rudder body front end portion
41: rudder body center
42: rudder body twist left side
43: rudder body twist right side
50: rudder body rear end
61: first rudder body section
62: second rudder body section
63: third rudder body section
100: Vertical line
200: Horizon
A: First section of bulb
B: 2nd section of bulb
C: Third section of bulb
J1: Rudder bulb Contact point between starboard and rudder body
J2: Contact point of rudder bulb port and rudder body
P1: first reference line
P2: Second baseline
α: starboard bulb angle
β: Positive valve angle
γ: Right twist angle
δ: Left twist angle

Claims (4)

A rudder for a ship comprising a rudder body rotatably installed at the rear of a propeller and a rudder bulb installed at the rudder body,
Wherein a starboard bulb has an asymmetrical shape at the port side and the starboard side,
Wherein the rudder body has a twisted structure in a vertical direction.
The method according to claim 1,
Wherein the rudder body is formed such that the twisted angle gradually increases toward the up and down direction with respect to the center portion.
The method according to claim 1,
Wherein the rudder body is twisted left and right by 5 degrees with respect to a vertical line.
4. The method according to any one of claims 1 to 3,
Wherein the port has a slope of 1 to 30 degrees with respect to a second reference line and a slope of 0 to 15 degrees with respect to a first reference line of the starboard.

Images