JPH0361197A - How to center the rudder post - Google Patents

Abstract

PURPOSE:To enhance the centering accuracy by transporting a lower gudgeon piece to a site in such a state that it has been fitted to the lower end of a rudder post body, and by bringing the center line of a fitting flange nearly in line with the axis of a propulsive propeller shaft, and also adjusting it so as to be in parallel to the axis of the propulsive propeller shaft. CONSTITUTION:By integrally fitting a lower gudgeon piece 4b to the lower end of a rudder post 4, the rudder post 4 having a fitting flange 8 for an idling propeller is manufactured. The rudder post 4 is transported to a dock, and is positioned so that the center line C of the fitting flange 8 is brought on the axis A of a propulsive propeller coinciding with the axis of a stern tube 3. In this case, by utilizing a piano wire extended between the sight slit 9a provided on the center hole 8a of the fitting flange 8 and the sight slit 10a on the center of the stern tube 3, paralleling and position operation is carried out. By this constitution, centering accuracy can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for centering a rudder post to which an idling propeller is attached in a ship having an idling propeller in addition to a propulsion propeller.

[Prior Art] In order to reduce horsepower on large ships, an idling propeller with a larger diameter than the propeller is arranged on the same axis behind the propeller, and the propeller is attached to the main engine inside the ship. A turbo propeller system is adopted in which the propeller is rotated by power, and the rear idling propeller receives the accelerated flow of the front propulsion propeller and causes it to idly rotate in the same direction.

In the above turbo propeller system, the shaft on which the propulsion propeller is attached is extended rearward, and the idling propeller is attached on the same axis so that it can rotate freely, and the other is the type where the propeller is attached to the lower end of the rudder column There is a type in which an idling propeller is attached to the axis of the propeller, but the latter type is more advantageous than the former type because it can reduce the load on the shaft system. It has been developed by the applicant.

In the case of the above-described type in which the idling propeller is attached to the rudder post, it is necessary to center the rudder post when assembling the rudder post so that the idling propeller is located on the same axis as the propulsion propeller.

Until now, as a method for centering the rudder post, as shown in FIG. A vertical line passing through 5 and 6, i.e., the rudder center line B
A mounting flange 8 for the idling propeller 7 is provided at a level position where the idling propeller 7 and the idling propeller 7 are perpendicular to each other, so that the propulsion propeller 1 and the idling propeller 7 are on the same axis.

[Problems to be Solved by the Invention] However, when centering the rudder post, it is not possible to center the rudder post by satisfying only the condition that the rudder center line B is perpendicular to the axis line of the propulsion propeller 1 as described above. It is impossible to ensure accuracy with respect to the vertical and horizontal deviations between the center of the mounting flange 8 and the axis of the propulsion propeller 1, and the vertical and horizontal inclination of the mounting flange 8.

Therefore, the present invention provides that the center line of the mounting flange provided for attaching the reversing propeller to the lower end of the rudder post is on the axial center line of the propulsion propeller, and that the vertical and horizontal directions with respect to the axial center line are within permissible values. , a rudder post centering method that assembles the rudder post so that the vertical and horizontal inclinations of the mounting flange are within the permissible values, and the axis of the propulsion propeller and the rudder center line are orthogonal within the permissible values. This is what we are trying to provide.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides: (i) When installing a mounting flange to the lower end of a rudder post in a moat, the rudder which passes through the center line of the mounting flange and the upper and lower gudgeons; Then, the center line of the mounting flange at the lower end of the rudder post is aligned vertically, horizontally, and horizontally with respect to the propulsion propeller axis center line that passes through the center of the stern tube of the stern frame that has been installed on the hull. The rudder post is centered by determining the position and orientation of the mounting flange so that it does not shift and is parallel to the axis of the propulsion propeller. Also, maintain a predetermined distance between the front of the mounting flange and the rear end of the stern tube to fix the rudder post to the hull.

[Function] The mounting flange itself is machined with precision so that the center line of the mounting flange for attaching the idling propeller is perpendicular to the rudder center line, and the center line of the mounting flange is aligned with the propulsion propeller axis line. By positioning the rudder in such a manner, the rudder post can be centered and installed with high accuracy.

As a result, if the idling propeller is attached to the mounting flange, the idling propeller will be placed on the same axis behind the propulsion propeller.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. First, when building a ship in a dock, a stern frame 2 at the front of the ship is attached. At this time, 1. the stand frame 2 is positioned and attached so that the axis of the stand dupe 3 is horizontal and parallel to the center line of the ship. On the other hand, rudder post 4
consists of a hollow rudder post body 4a made of a steel plate and a lower gudgeon piece 4b made of cast metal at its lower end. 5 and 6 are perpendicular to the rudder center line B, and the lower gudgeon piece 4b is integrally assembled to the lower end of the rudder post main body 4a at the factory. A rudder post 4 having a mounting flange 8 for a propeller 7 (see Figure 4) is manufactured.

Next, the rudder post 4 manufactured at the above factory is carried into the dock,
The mounting flange 8 is positioned so that the center line C of the mounting flange 8 is on the propulsion propeller axis A that coincides with the axis of the stern tube 3. In this case, proceed as follows. Note that the hole 8a at the center of the mounting 7 flange 8
At the same time, a see-through hardware 9 having a slit 9a as a see-through portion is installed in the center of the hole 8a in advance, and a see-through metal fitting 9 is installed in the center of the stern tube 3 at the gunwale end and the open end of the stand dupe 3 in advance. Suri 1~10a, lla as part 4
．． i Attach the see-through hardware 10 and 11 respectively,
First, a piano wire 12 is stretched between the see-through hardware 9 of the mounting flange 8 and the see-through hardware 10 at the front end of the standup, as shown in FIG. At this time, the slit portion of the see-through hardware 11 at the end of the stub tube is removed. Next, the position of the mounting flange 8 is adjusted by moving the rudder post 4 so that the stretched piano wire 12 comes to the center of the see-through hardware 11 at the front end of the standup. In this case, the piano wire 12 is located at the center of the see-through hardware 11, and there is no difference between the piano wire 12 and the center of the see-through hardware 11, but even if there is a difference, , the difference is vertical, horizontal, horizontal (
If it is within 3M in each direction (a, b directions in FIG. 2), it is considered to be within the allowable value. Next, when constructing the hull, the dock bottom 1
3, lower the plumbum 14 along the rudder center line 8 to the centerline D of the hull, which is shifted to shift 1, and lower the plumbum 14 to the dock bottom 13.
Measure the difference δ between the center line D and the plumb swing 14,
The difference δ is reduced to 83 within 5#.

When the position of the mounting flange 8 is determined so that the center of the mounting flange 8 is placed on the propulsion propeller axis A, the distance between the rear end surface of the stern tube 3 and the front surface of the mounting flange 8 is measured, For example, measure the inclination of the mounting flange 8 so that the center line C of the mounting flange 8 matches the piano wire 12, and adjust the mounting flange so that it is within the allowable value. Adjust the tilt of the front of 8. In this case, as shown in FIG.
Measure the vertical and horizontal inclinations c and d, and the difference is the vertical,
The left and right sides should be within 5# each.

By determining the position and orientation of the mounting flange 8 in this way, the rudder center line B is made perpendicular to the propulsion propeller axis line within a permissible value, and the rudder post is centered.

Once the centering of the rudder post 4 has been carried out, the rudder post 4 is assembled to the hull. If necessary, the series of centering steps described above may be repeated once again to avoid misalignment of the center position of the mounting flange 8, The deviation between the center line C and the piano wire 12, that is, the propulsion propeller axis, may be measured to confirm that the difference in deviation is within an allowable value.

At this time, the horizontal inclination of the mounting flange 8 is determined by lowering the plumbum from the rear end of the stern tube and from the front of the mounting flange 8, and lowering the plumb line along the rudder center line B and lowering it from the stern tube. It is also possible to measure by placing the transilla 1~ at the plumb-down position and observing the left-right deviation between the plumb-bang from the mounting flange 8 and the plumb-bang along the rudder center line B.

When the idling propeller 7 is attached to the mounting flange 8 of the rudder post 4 centered by the centering method of the present invention as shown in FIG. It is precisely placed behind the propeller 1 on the same axis.

[Effects of the Invention] As described above, according to the rudder post centering method of the present invention,
The mounting flange is manufactured so that the center line of the q flange is perpendicular to the rudder center line that passes through the upper and lower flange, and the mounting flange is precisely machined. Propulsion is achieved by transporting the column to the site, determining the center position of the mounting flange at the position of the propulsion propeller axis, and adjusting the inclination of the mounting flange so that the center line of the mounting flange is parallel to the propulsion propeller axis. Since the propeller axis and the rudder center line are centered so that they are perpendicular to each other, the following excellent effects can be achieved.

(1) Machining of the free-rotating propeller mounting flange after it has been assembled into the hull can be omitted, significantly shortening the process and reducing costs, as well as improving machining accuracy.

(11) Since the center line of the mounting flange and the rudder center line are machined so that they are perpendicular to each other, in the field, the center line of the mounting flange and the axis of the propulsion propeller on the stern frame side are
Since the centering work can be performed by aligning the left and right positional deviations and the vertical and horizontal parallelism deviations within the permissible values, centering can be performed easily and with high precision.

(tii) The method of the present invention can also be adopted for general rudder post installation due to precision control using the same steps as the method of the present invention, and this can also contribute to reducing the shaft tube polling time.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a schematic diagram showing the state when positioning the idling propeller mounting flange, and Fig. 3 is a diagram showing the state when adjusting the inclination of the idling propeller mounting flange. FIG. 4 is a side view showing an example of a type in which an idling propeller is attached to a rudder post. 1... Propulsion propeller, 2... Stun frame, 3...
... Stun tube, 4... Rudder post, 4a... Rudder post body, 4b... Lower gudgeon piece, 5... Upper gudgeon, 6... Lower gudgeon, 7... Idle propeller,
8...Mounting flange, A...Propulsion propeller axis line,
B: Rudder center line, C: Center line of mounting flange.

Claims (1)

[Claims] (1) When manufacturing the rudder post at the factory, a lower gudgeon piece is machined so that the center line of the mounting flange for attaching the idling propeller and the rudder center line extending in the vertical direction are perpendicular to the lower end of the rudder post body. Then, the rudder post is carried to the site, and the position of the mounting flange is determined so that the centerline position of the mounting flange is approximately on the axis of the propulsion propeller that is attached to the stern frame of the hull. A method for centering a rudder post, comprising centering the rudder post by adjusting the orientation of the mounting flange so that the center line of the mounting flange is parallel to the axis of the propulsion propeller.