JPS5844894B2 - How to install bearing hardware - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for mounting a bearing hardware having a journal bearing portion for supporting a rotating shaft such as a rudder shaft of a ship onto a mounting base by aligning the rotating shaft and the bearing hardware. It is something.

Conventionally, when centering the upper bearing part of the rudder axle of a ship with respect to a rotating shaft such as a rudder axle of a bearing hardware, there is a gap between the outer periphery of the journal part of the rotating shaft and the inner periphery of the journal bearing part of the bearing hardware. Insert the feeler gauge into the annular gap that is formed,
The method used was to measure the gaps at multiple locations around the journal, correct the position (center) of the bearing hardware, and then repeat the same process to achieve centering.

However, when centering is performed using the method described above, it is necessary to repeat the work of measuring the gap and correcting the position many times, and even then, it is difficult to make the gap completely even around the entire circumference of the journal part. However, there were problems in that it was difficult and the workability was poor.

This invention has been made in consideration of the above-mentioned problems, and uses a centering jig to provide a bearing for the rotating shaft when attaching a bearing hardware having a journal bearing portion that supports the rotating shaft to a mounting base. It is an object of the present invention to provide a method for mounting a bearing hardware that allows easy centering of the hardware.

First, the structure of a rotating shaft such as a rudder shaft to which the present invention is applied will be explained.

In Figures 1 and 2, reference numeral 1 denotes a bearing hardware mount fixed to the deck of a ship, etc., and this bearing hardware mount 1 includes a fixing base 3 having a through hole 2 in the center, and a fixing base 3 having a through hole 2 in the center. A spherical seat 6 fixed on the table 3, having a through hole 4 in the center communicating with the through hole 2 and having a slightly larger diameter, and having a spherical convex surface 5 on the upper side.
It is equipped with the following.

7 is a rotating shaft (
(hereinafter referred to as the rudder shaft).

A sleeve 9 forming a journal portion 8 is attached to the rudder shaft 7.
is fixed.

Reference numeral 10 denotes a bearing hardware that is fixed onto the bearing hardware mount 1 with bolts 11, nuts 12, etc., and supports the rudder shaft 7.

This bearing hardware 10 includes an outer cylinder part 14 having a spherical concave surface 13 on the lower side that matches the spherical convex surface 5, and a journal firmly fixed to the inner circumferential surface 15 of the outer cylinder part 14 and corresponding to the journal part 8. Bearing mesh part 1 forming bearing part 16
7, and the length 11 of this bearing metal portion 17 is formed to be shorter than the axial length 12 of the inner circumferential surface 15 of the outer cylinder portion 14.

That is, in FIG. 1, the upper end surface 1 of the bearing metal part 17
8 is located below the upper end surface 19 of the outer cylindrical portion 14, and is located between the upper end surface 18 of the bearing metal 17, the inner peripheral surface 15 of the outer cylindrical portion 14, and the sleeve 9 (located on the rudder shaft to which the sleeve 9 is not fixed). is the rudder shaft itself) in the part surrounded by the outer circumferential surface 20,
An annular groove 21 is formed for inserting a packing.

Further, a plurality of female threaded portions 22 are formed on the upper end surface 19 of the outer cylinder portion 14 .

Reference numeral 23 denotes a cover that covers the abutting portion of the upper hardware 10 when the upper hardware 10 is fixed to the upper hardware mounting base 1, and the upper and lower inner circumferential portions are annular grooves on the outer periphery of the flange 10a of the bearing hardware 10. 10b and an annular groove 6a on the outer periphery of the spherical seat 6, respectively.

24 is a 01J ring fitted into an annular groove 6b formed on the upper surface of the spherical seat 6.

The bearing hardware 10 has a width W1 of the annular groove portion 21;
The outer peripheral surface 20 of the sleeve 9 and the inner peripheral surface 2 of the bearing metal part 17
It is centered with respect to the rudder shaft 7 and then fixed to the bearing hardware mount 1 so that the width W2 of the annular gap e formed by the rudder 5 is uniform over the entire circumference.

Next, 26 is an example of a centering jig used to carry out this invention.

As shown in FIGS. 2 and 3A and 3B, this centering jig 26 includes a cylindrical portion 28 that is formed of synthetic rubber, synthetic resin, or the like and includes an air storage chamber 27 that seals air.
A collar part 30 is fixed to the annular upper end surface of the cylinder part 28, and an air inflow pipe 32 that penetrates the collar part 30 and is equipped with a valve 31 is connected to the air storage chamber 28 at the upper end of the cylinder part 28.
The collar portion 30 has a through hole 33 that is concentric with the cylindrical portion 28 and has a diameter larger than the outer circumference of the sleeve 9, and the outer tube is provided outside the through hole 33. Internally threaded portion 2 formed on the upper end surface 19 of the portion 14
A mounting hole 35 for a bolt 34 is formed corresponding to the hole 2 .

Note that the diameter of the inner peripheral surface 36 and the diameter D2 of the outer peripheral surface 37 of the cylindrical portion 28 can be changed depending on the pressure of the air flowing into the air storage chamber 27. When the pressure is increased to a predetermined pressure or higher, the diameter D1 of the inner circumferential surface 36 is smaller than the outer diameter of the sleeve 9, and the diameter D2 of the outer circumferential surface 37 is smaller than the diameter of the inner circumferential surface 15 of the outer cylindrical portion 14 of the upper metal fitting 10. If the pressure of the air in the air storage chamber 27 is lowered to a predetermined pressure or less, the diameter D1 of the inner circumferential surface 36 becomes larger than that of the sleeve 9.
The diameter D2 of the outer circumferential surface 37 is smaller than the diameter of the inner circumferential surface 15 of the outer cylindrical portion 14 of the bearing hardware 10.

Hereinafter, a method for centering the bearing hardware 10 when attaching the bearing hardware 10 to the bearing hardware mount 1 using the centering jig 26 will be described.

In advance, as shown in FIG.
0, so that the spherical concave surface 13 of the bearing hardware 10 is superimposed on the spherical convex surface 5 of the bearing hardware mounting base 1.

Note that the rudder axle 7 is held in a lower bearing such that the rudder axle 7 is directed to a predetermined position below (not shown).

Next, the cylindrical portion 28 of the centering jig 26 is inserted into the annular groove 21 into which the packing is inserted, with the pressure of the air in the air storage chamber 27 being lower than a predetermined pressure.

Next, air is gradually introduced into the air storage chamber 27 from the air inflow pipe 32 to expand the air storage chamber 27, and when the pressure inside the air storage chamber 27 exceeds a predetermined pressure, the inner circumferential surface 36 of the cylindrical portion 28 The sleeve 9 is held in close contact with the outer peripheral surface 20 of the sleeve 9, and the outer peripheral surface 37 of the cylindrical portion 28 is in close contact with the inner peripheral surface 15 of the bearing hardware 10 to hold the bearing hardware 10. shall be.

At this time, the pressure inside the air storage chamber 27 is constant at any position, and since this air pressure acts to uniformly expand the air storage chamber 27 over the entire circumference, the bearing hardware 10 The outer circumferential surface 20 of 28 moves the bearing hardware 1 relative to the rudder shaft 7 on the spherical convex surface 5 so that the width W1 of the annular groove 21 becomes uniform over the entire circumference.
Zero centering is performed.

After the centering work of the bearing hardware 10 has been carried out in this way,
Fix the bearing hardware 10 to the bearing hardware mounting base 1 with bolts 11 and nuts 12, then remove the air in the air storage chamber 27 of the centering jig 26, and pull out the centering jig 26 from the annular groove 21. Instead, by inserting an annular packing (not shown) into the annular groove 21 and pressing it with a packing gland attached to the bearing hardware 10 using the threaded portion 22, the installation work of the bearing hardware 10 is completed. do.

Note that the centering jig 26 adjusts the inner circumferential surface 36 and outer circumferential surface 3 of the cylindrical portion 28 according to the pressure of the air in the air storage chamber 27.
7 can set the surface pressure in contact with the outer peripheral surface 20 of the sleeve 9 and the inner peripheral surface 15 of the bearing hardware 10.
After centering and fixing the bearing hardware 10 to the bearing hardware mounting base 1, the centering jig 26 can also be used as a packing by adjusting the air pressure in the air storage chamber 27 to an appropriate value. be.

In this way, when the centering jig 26 is also used as a gasket, the inner circumferential surface 36 of the cylindrical portion 28 is formed of a sliding material with a high sealing effect, and the air pressure in the air storage chamber 27 is reduced. After adjusting and confirming that the rudder shaft 7 rotates smoothly, the collar portion 30 is fixed to the bearing hardware 10 with bolts 34, and the work is completed.

In the above embodiment, the present invention is applied to the case of attaching a bearing hardware to the rudder shaft of a ship, but the present invention is not limited to this, and is applicable to the attachment of a bearing hardware to the rotating shaft of other devices and machinery. It can also be applied to

As explained above, the mounting method of the bearing hardware according to the present invention uses a centering jig that is made of synthetic rubber, synthetic resin, etc. and has a cylindrical part that is equipped with an air storage chamber that seals air. In addition, since the bearing hardware is centered with respect to the rudder shaft while air is flowing into the air storage chamber and the cylinder is expanded, the air pressure inside the air storage chamber causes the cylinder to expand evenly over the entire circumference. (In other words, it acts to move the bearing hardware so that the width W1 of the annular groove is uniform over the entire circumference.) Therefore, simply by allowing air to flow into the air storage chamber, the centering of the bearing hardware and Fixing to the mounting base can be done easily and accurately, significantly improving work efficiency, and the parts of the rudder shaft and bearing hardware that come into contact with the centering jig will not be damaged. There is.

[Brief explanation of drawings]

1 and 2 show the procedure for carrying out the present invention. FIG. 1 is a cross-sectional explanatory view at the preparation stage, FIG. 2 is a cross-sectional explanatory view during centering work, and FIG. One embodiment of the centering jig used to carry out the present invention is shown, in which FIG. 3A is a sectional front view and FIG. 3B is a bottom view. 1... Bearing hardware mounting base, 7... Rotating shaft (rudder shaft), 9... Sleeve, 10...
Bearing hardware, 14... Outer cylinder part, 15...
Inner circumferential surface, 20... Outer circumferential surface, 21... Annular groove, 26... Centering jig, 27...
...Air storage chamber, 28...Cylinder part.

Claims (1)

[Claims] 1. A bearing hardware 10 for supporting the rotating shaft 1 is slidably supported on a bearing hardware mount 1 through which the rotating shaft 7 passes, and then the outer circumferential surface 20 of the rotating shaft 7 and the bearing hardware 10 are attached.
The cylindrical part 28 of the centering jig 26 with the air pressure in the air storage chamber 27 set to a predetermined pressure or less is inserted into the annular groove 21 formed by the inner peripheral surface 15 of the outer cylindrical part 14. By gradually increasing the air pressure in the storage chamber 27 and inflating the cylindrical portion 28, the bearing hardware 1 relative to the rotating shaft 7 is
1. A method for mounting a bearing hardware, characterized in that the bearing hardware 10 is centered on the bearing hardware mount 1.