JPH09156595A - Stern tube shaft sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the adjustment of a shaft core with respect to a shaft sealing device of a stern pipe of a shaft system of a ship. SOLUTION: An inner peripheral face and mounting faces C1 , C2 of a stern boss 1 are machined at a factory by matching them with a shaft core (line-of- sight) 5 thereof. Stern tube bearings 12a, 12b machined in the same core are fixed by resin chocks 4a, 4b and mounted on the inner peripheral face of the boss 1, and mounting of them is adjusted by matching them with a center line 16 of the bearings having inclination for the shaft core 5. Since shaft sealing devices 8a, 8b are mounted at both ends of the stern boss 1 by using bolts through distance rings 7a, 7b which are adjusted in finish-machining to adjust deviation of core with the center line 16 of the bearings, the installation by the use of a large machine and machining for adjustment are not required at the site of assembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stern tube shaft sealing device for a ship shaft system, in which a shaft center is adjusted by a distance ring.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional stern tube of a shaft system. In the figure, 1 is a stern boss, which has a mounting surface C ₁ for mounting the shaft sealing device and a reference point a at one end, and also has a mounting surface C ₂ for the shaft sealing device at the other end. Inner peripheral surfaces b ₁ and b ₂ into which the bearing is inserted are provided inside. The inner peripheral surfaces b ₁ and b ₂ of the stern boss 1 are connected to the main engine NO. Align the shaft center (see-through line) 5 with the center of the 1CYL crank as a reference, and machine the inside diameter on-site with a bite. Mounting surface C ₁ , C ₂
Is also aligned with the shaft core 5, and boring is performed on site so that it is perpendicular to the shaft core.

FIG. 4 is a cross-sectional view of the stern tube in which the bearing and the shaft seal device are assembled. The stern tube bearing 2a is formed on the inner peripheral surface b ₁ of the stern boss 1, and the stern tube bearing is formed on the inner peripheral surface b _2. 2b are inserted as shown by the dotted lines, the shaft sealing device 3a is mounted on the mounting surface C _1, and the shaft sealing device 3b is mounted on the mounting surface C ₂ . The bearing center line 6 of the stern tube bearing
Is designed to be slanted toward the stern direction with respect to the axis 5, and the bearing inner peripheral surface is machined in this manner.

The stern tube bearings 2a and 2b are machined in the factory so that the outer peripheral surfaces thereof are aligned with the shaft core 5 and the inner peripheral surfaces thereof are machined in the factory according to the bearing center line 6.

Further, the front surfaces of the shaft sealing devices 3a and 3b are aligned with the shaft core 5 and processed by a seal maker in a factory. To process.

As described above, the stern tube shaft sealing device is
Inner peripheral surface b₁, B_Two, Mounting surface C ₁, C_TwoOn the axis 5
After cutting on the spot together, insert the stern tube bearings 2a and 2b.
Then, the shaft sealing devices 3a and 3b are attached to both ends. Stern tube axis
As described above, the bearings 2a and 2b have the bearing center line 6 of the bearing surface as the shaft.
It is designed to descend and tilt with respect to the wick 5.
ing.

FIG. 5 is a cross-sectional view of the stern tube shaft sealing apparatus shown in FIGS. 3 and 4, which has been improved so as to simplify the processing. In the figure, the parts different from those in FIGS. 3 and 4 are the stern tube bearings 12a without the boring of the stern boss 1.
12b is fixed with resin chocks 4a and 4b.

That is, in FIG. 5, 1 is a stern boss,
Reference numerals 12a and 12b are stern tube bearings, 13a and 13b are shaft sealing devices, 4a and 4b are resin chocks for fixing the stern tube bearings 12a and 12b, 5 is a shaft core (see through line), and 16 is a bearing center line. . The inner peripheral surface of the stern boss 1 and the mounting surfaces C ₁ ′ and C ₂ ′ are not processed in the field, and the stern tube bearing 12 a,
The inner and outer peripheral surfaces of 12b are concentrically processed at the factory. The seal makers 13a and 13b are cut by their own factory and delivered so that they are eccentric to the bearing center 16.

[0009]

In the conventional stern tube shaft sealing device shown in FIGS. 3 and 4, the stern tube boring is carried out by inserting the boring machine into the narrow space each time.
Since machining is performed after installation, the inner diameter finishing accuracy is required to be much higher than the hull structure accuracy.
Skilled technical skills are required.

Further, the working environment is in a very severe condition such that the temperature change is small and it must be performed from the next morning to the next morning so as not to be affected by the heat deformation of the hull.
After completion of such stern tube boring, the stern tube bearing 2
The a and 2b were press fitted into the inner peripheral surfaces b ₁ and b ₂ of the stern boss 1 with a press fitting margin.

As a new construction method for simplifying such a series of operations, as shown in FIG. 5, the stern tube bearings 12a, 12b are mounted on the resin chocks 4a, 4b without boring the stern tube.
A method of fixing with is being developed. The stern tube bearings 12a and 12b in this case are positioned at arbitrary positions by the set bolts, but stern tube boring is not applied to the mounting surfaces C ₁ ′ and C ₂ ′ of the shaft sealing devices 13a and 13b. The perpendicularity between the shaft center and the mounting surfaces C ₁ ′ and C ₂ ′ deviates from the bearing center line 16. For the adjustment, both the stern boss 1 and the shaft sealing devices 13a and 13b machined in the factory are cut on site.

The cutting of the stern boss 1 is an on-site work at a high place, and it takes a lot of time to install and machine a large machine tool. The shaft sealing devices 13a and 13b are processed and carried in by an external seal maker, but the eccentricity amount is measured in advance, this value is notified to the seal maker, and the seal maker self-determines based on this value. Manufacturing the shaft sealing device at the factory and delivering it to the factory to which it is ordered, the process takes a long time.

[0013]

The present invention provides the following means in order to solve such problems.

(1) A stern boss having a through hole in the axial direction of the main engine of the ship, and a stern tube bearing inserted so as to have a bearing center line eccentric from the axial center in the through hole of the stern boss. A stern tube shaft sealing device having a shaft sealing device for sealing the stern tube bearing at both axial ends of the stern boss, wherein the shaft sealing device adjusts the eccentric amount in the stern boss. A stern tube shaft sealing device, characterized in that it is attached via a distance ring.

(2) In the above (1), the distance ring comprises a circumferential fitting portion that fits into the shaft sealing device, and a mounting means that fits on the opposite side of the stern boss end surface. A stern tube shaft sealing device.

According to the present invention, in (1), the stern tube bearing is eccentrically mounted so as to incline from the axis by such means. This mounting is, for example, concentric stern tube bearing. Adjustment can be facilitated by adopting a construction method in which the bearing center line is positioned so as to have a predetermined inclination from the shaft core, and the bearing is fixed and attached with a range or the like. A shaft sealing device is attached to both ends of the stern boss, but since the shaft sealing device is mounted via a distance ring, the misalignment between the mounting surface and the bearing center line and the squareness of the mounting surface can be adjusted with this distance ring. Therefore, only adjustment and finishing are required, and there is no need to make adjustments or processing at large assembly sites.

Further, in (2), the distance ring is fitted to the shaft sealing device at a circumferential fitting portion, the mounting surface is adjusted to both ends of the stern boss, and the shaft can be mounted by bolts or the like. Installation of the sealing device becomes easy.

By the means as described above, the large-scale boring processing of the conventional stern tube can be eliminated. That is, it is a high place, and it is not safe to bring a boring machine or the like into the gap work, so it is a safe work. In addition, the eccentric processing of the shaft sealing device can be eliminated, and all the shaft sealing devices can be finished by concentric processing. These can significantly shorten the stern tube work process (about 1-2 days).

[0019]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view of a stern tube shaft sealing device according to an embodiment of the present invention, and FIG.
FIG. 6 is a view on arrow AA in FIG. In these figures, 1 is a stern boss, 4a and 4b are resin chocks, and 7a and 7b.
b is a distance ring that is a feature of the present invention, and 8a and 8a.
Reference numeral b is a shaft sealing device, and 12a and 12b are stern tube bearings fixed by resin chocks 4a and 4b.

In such a structure, the stern boss 1
The inner surface of the is left as it is in the factory, not in the field. Also, the mounting surfaces C ₁ 'and C ₂ ' are not subjected to on-site processing, but only the dimensions are measured. Stern tube bearings 12a, 1
The inner and outer peripheral surfaces of 2b are concentrically processed in the factory, and the resin chocks 4a and 4b are attached to the inner peripheral surface of the stern boss 1 with the inclination adjusted. The shaft sealing devices 8a and 8b are standard products manufactured by processing them into the same core.

Next, the case where the stern tube bearings 12a and 12b are installed on the resin chocks 4a and 4b will be described with reference to FIGS. The stern boss 1 is a part of the hull, and the inner diameter portion is aligned with the shaft core 5 (axial line of sight) and rough-finished. The stern tube bearings 12a and 12b are stern-bossed so that the inner and outer diameters of the bearings are finished to be concentric, and the resin chocks 4a and 4b are placed at arbitrary positions (inclination, etc.) with respect to the bearing center line 16. Insert it into the inner diameter part of 1, and adjust the inclination and fix it.

The shaft sealing devices 8a and 8b are attached to the stern side and the bow side of the stern boss 1, respectively.
Since the shaft core 5 and the stern tube bearings 12a and 12b are misaligned from the bearing center line 16 and the mounting surface is tilted, distance rings 7a and 7b are attached with bolts. Bolt holes 7-1 are provided on the distance rings 7a and 7b.
Is attached to the stern boss mounting surface C ₁ 'with a bolt. This distance ring 7a, 7b
The stern tube shaft sealing devices 13a and 13b are attached to the bolt holes 7-2 with bolts.

The distance rings 7a and 7b are manufactured at the factory by measuring the center deviation of mounting the shaft sealing device and the inclination of the mounting surface, and measuring the measured values. When such distance rings 7a, 7b are used, the shaft sealing devices 13a, 1b
3b can be attached only by finishing using a standard product that has been processed to be concentric, eliminating the need for stern boss boring, which is required in the past, and greatly reducing the large machine tool and the time and effort required for processing.

Incidentally, such a distance ring 7
The mounting of the shaft sealing device using a and 7b can be applied to the conventional example shown in FIG. 4, but there is little merit in that it also cuts the inner peripheral surface of the stern boss and the distance ring mounting surface. . When the distance rings 7a and 7b are used as stern tube bearings by using the resin chocks 4a and 4b, it is not necessary to install a large machine in the field at all, and both cuttings for adjusting the mounting surface (stern boss, shaft seal) are performed. Since the devices 7a, 7b) are not required, work at the site is greatly streamlined.

[0025]

As described above in detail, according to the present invention, the stern tube bearing and the stern tube bearing inserted so as to have the bearing center line that is inclined and eccentric from the shaft center in the through hole of the stern boss and In a stern tube shaft sealing device having a shaft sealing device attached to both ends of the stern boss, the shaft sealing device is attached via a distance ring, and further,
The distance ring has the following effects because it has a circumferential fitting portion that fits into the shaft sealing device and a mounting means that is mounted on both ends of the stern boss.

(1) The finishing work of the shaft seal device mounting surface of the stern tube, which had been finished by the boring process of the hull, can be eliminated, and the work can be performed in a safe environment. It can be shortened by 1-2 days.

(3) Further, the hull mounting surface of the shaft sealing device for the stern tube is conventionally eccentric, but it is possible to perform concentric processing.

(4) Further, the distance ring simplifies the position adjustment of the shaft sealing device, and the mounting thereof can be easily performed with bolts or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a stern tube shaft sealing device according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a cross-sectional view of a conventional stern tube showing a processed state.

FIG. 4 is a sectional view of a conventional stern tube shaft sealing device showing an assembled state of the stern tube bearing and the shaft sealing device.

FIG. 5 is a sectional view of a stern tube bearing device in which a stern tube bearing is fixed by a conventional resin chock.

[Explanation of symbols]

 1 Stern boss 4a, 4b Resin chock 5 Shaft core (see through wire) 7a, 7b Distance ring 8a, 8b Shaft sealing device 12a, 12b Stern tube bearing 16 Bearing center

Claims (2)

[Claims] 1. A stern boss having a through hole in the axial direction of the main engine of the ship, and a stern tube bearing inserted so as to have a bearing center line eccentric from the axial center in the through hole of the stern boss, In a stern tube shaft sealing device having a shaft sealing device that seals the stern tube bearing at both ends in the axial center of the stern boss, the shaft sealing device is for adjusting the eccentric amount in the stern boss. A stern tube shaft sealing device characterized by being mounted via a distance ring. 2. The distance ring comprises a circumferential fitting portion that fits into the shaft sealing device, and a mounting means that fits on the stern boss end face on the opposite side thereof. The stern tube sealing device described.