JPH10316094A - Bearing structure of rudder head shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a rudder head shaft from being slipped down even if a roller bearing is broken by fixedly fitting a fixing ring superposed on a rudder trunk in a plan view to a rudder head shaft. SOLUTION: A fixing ring 26 is fixedly fitted to a rudder head shaft 14 of the upper part of a roller bearing 20, and in a plan view, the fixing ring 26 and a rudder trunk 16 are superposed. To be concrete, a step 16a is formed on the rudder trunk 16 of a place where the fixing ring 26 is positioned, and the step 16a and the fixing ring 26 are superposed. Thus, even if a roller bearing 20 is broken or the like to slip down the rudder head shaft 14, the fixing ring 26 is regulated by the step 16a of the rudder trunk 16 not to be lowered more. Accordingly, the position of a rudder plate is little changed, and unnecessary force is little applied to a support arm of the base. The fixing ring 26 and the step 16a are of a contact type in which they are in contact with lubricity, or of a non-contact type in which they are out of contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a rudder shaft on which a rudder plate is mounted.

[0002]

2. Description of the Related Art FIG. 2 is a side view of a rear part of a ship, in which a rudder plate 10 is suspended from a rudder shaft 14 hanging from a hull 12, and steering is performed by rotating the rudder shaft 14. .
For this reason, the rudder shaft 14 is rotatably supported by a rudder trunk 16 incorporated in the hull 12. In this embodiment, the auxiliary rudder plate 18 is provided at the rear of the rudder plate 10 so as to be able to bend.

FIG. 3 is a sectional view of a main part of the rudder shaft 14,
The rudder shaft 14 is mounted on the rudder trunk 16 with the roller bearing 2.
It is rotatably supported by 0 (usually, a tapered inner ring is used). In this case, the rudder shaft 1
4 and the roller bearing 20 are fastened by a nut 22 screwed to the rudder shaft 14.

[0004]

When a large impact load or the like is applied to the rudder plate 10, the roller bearing 20 may be damaged. When such a situation occurs, the rudder shaft 14
The support arm 24 that receives the bottom of the rudder plate 10 is broken and becomes inoperable, or breaks. Further, in a rudder that simply suspends the rudder plate 10, the rudder plate 10 may fall. The present invention has been made to solve such a problem, and is intended to prevent the rudder shaft from slipping down even if the roller bearing is broken.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention relates to a rudder shaft support structure for rotatably supporting a rudder shaft for suspending a rudder plate to a rudder trunk by roller bearings. A support structure for a rudder shaft, wherein a fixing ring that overlaps with a rudder trunk in plan view is firmly fitted to the shaft.

According to the present invention, even if the roller bearing is damaged and the rudder axle slips, the fixing ring is supported by the rudder trunk to prevent further slipping.

Further, according to the present invention, in the above means, a groove is formed in the rudder shaft, and a fixing ring divided into two is fitted into the groove and fixedly fitted therein. Roller bearings, means for pushing the rudder shaft into the self-aligning roller bearings with push bolts standing in the axial direction of the fixing ring, overlapping the cover attached to the upper part of the rudder trunk and the upper surface of the fixing ring with a slight gap The provided means are also provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings (members having the same functions as in the conventional example are denoted by the same reference numerals). FIG. 1 is a sectional view of an upper part of a rudder trunk showing an example of the present invention.
Is rotatably supported by the roller bearing 20 on the rudder trunk 16 in the same manner. In this example, the roller bearing 2
0, the inner ring having the self-aligning function receiving both the radial load and the thrust load has a taper in which the upper portion becomes thinner by about 1/12 (therefore, the rudder shaft 14 also has a taper corresponding thereto). Although self-aligning roller bearings are used, the types of bearings are not limited to this.

However, the difference is that a fixing ring 26 is fixedly fitted to the rudder shaft 14 above the roller bearing 20, and in plan view,
The point is that the fixing ring 26 and the rudder trunk 16 are superposed. Specifically, a step 16a is formed in the ladder trunk 16 where the fixing ring 26 is located, and this step 16a
And the fixing ring 26 are polymerized. The fixing ring 26 and the step 16a are classified into a contact type in which the fixing ring 26 is kept in contact with the lubricating property and a non-contact type in which the contact is not made.

In this case, the fixing ring 26 is
, But there are various ways to do so. For example, a fixed ring 26 having a circular shape may be fitted to the rudder shaft 14 and tightened by screws (not shown) from the radial direction. However, the most secure and effective method is to form a groove 28 in the rudder shaft 14 as shown in FIG.
This is a method in which the fixing ring 26 split into two or three is fitted, and the two are fastened and fixed to each other with bolts or the like (not shown).

According to the fixing ring 26, if the push bolt 30 is set up in the axial direction, the rudder shaft 14 can be pushed into the self-aligning roller bearing 20 by pushing the push bolt 30. Therefore, the conventionally required nut can be eliminated. In this case, the number of the push bolts 30 is preferably about 12 to 36.

By using the above-described fixing ring 26, even if the roller bearing 20 is damaged or the rudder shaft 14 is going to slip down, the fixing ring 26 is restricted by the step 16a of the rudder trunk 16. , Will not fall any further. Therefore, the position of the rudder plate 10 does not change much, and no excessive force is applied to the support arm 24 at the bottom.

On the other hand, a cover 32 is mounted on the upper part of the rudder trunk 16.
It is appropriate that the upper surface of 6 is polymerized while maintaining a slight gap. This is because when an upward force is applied to the rudder plate 10 for some reason, the upward movement of the rudder shaft 14 is also slightly suppressed.

In addition, grease is injected into the roller bearing 20 from a grease injection hole 34 formed in the rudder trunk 16. Oil seal 36 in position
And a spacer ring 38 are provided. Also, fixing ring 2
6, a circulation hole 40 for allowing the grease to flow is also formed. Further, the outer ring of the roller bearing 20 and the rudder trunk 16 are positioned with a distance ring 42 interposed therebetween.

[0015]

As described above, according to the present invention, even if the roller bearing for supporting the rudder shaft is damaged or the rudder shaft tends to slip down, this is prevented by the fixing ring. Therefore,
It is possible to prevent the rudder plate from sliding down, the support arm receiving the rudder plate from being broken, or the rudder plate dropping into the sea in the case of a suspended rudder, making it impossible to steer, thereby ensuring navigation safety. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a rudder trunk showing an example of the present invention.

FIG. 2 is a side view of a stern showing around a rudder plate.

FIG. 3 is a sectional view of a main part of a conventional rudder trunk.

[Explanation of symbols]

 Reference Signs List 10 rudder plate 14 rudder shaft 16 rudder trunk 20 roller bearing 26 fixing ring 28 groove 30 push bolt 32 cover

Claims (4)

[Claims] In a rudder shaft support structure for rotatably supporting a rudder shaft for suspending a rudder plate to a rudder trunk by roller bearings, a fixing ring that overlaps with the rudder trunk in plan view is fixed to the rudder shaft. A rudder shaft support structure characterized by being fitted. 2. The rudder shaft support structure according to claim 1, wherein a groove is formed in the rudder shaft, and a split fixing ring is fitted into the groove and fixedly fitted. 3. The self-aligning roller bearing having a tapered inner ring as the roller bearing, and the rudder shaft is pushed into the self-aligning roller bearing by a push bolt standing in the axial direction of the fixing ring. 3. The support structure for a rudder shaft according to any one of claims 1 to 2. 4. The rudder shaft bearing structure according to claim 1, wherein a cover mounted on an upper part of the rudder trunk and an upper surface of the fixing ring are superposed with a slight gap therebetween. .