JP3903472B2 - Rudder axle support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a steering shaft to which a steering plate is attached.
[0002]
[Prior art]
FIG. 2 is a side view of the rear part of the ship. The rudder plate 10 is suspended from a rudder shaft 14 that hangs down from the hull 12, and steering is performed by rotating the rudder shaft 14. For this reason, the rudder axle 14 is rotatably supported by a ladder trunk 16 incorporated in the hull 12. In this example, the rudder plate 10 is provided with a secondary rudder plate 18 that can be bent with respect to the rear of the rudder plate 10.
[0003]
FIG. 3 is a cross-sectional view of the main part of the rudder shaft 14. The rudder shaft 14 is rotatable with respect to the ladder trunk 16 by a roller bearing 20 (usually, the inner ring is tapered). It is supported. In this case, the rudder shaft 14 and the roller bearing 20 are tightened by a nut 22 that is screwed onto the rudder shaft 14.
[0004]
[Problems to be solved by the invention]
By the way, if 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 axle 14 slides down and becomes inoperable, or the support arm 24 that receives the bottom of the rudder plate 10 is broken. Further, in the case of a suspension rudder that simply suspends the rudder plate 10, the rudder plate 10 may fall.
The present invention solves such a problem, and prevents the rudder shaft from sliding down even if the roller bearing is damaged.
[0005]
[Means for Solving the Problems]
Under the above object, the present invention provides radial noted in claim 1, the rudder shaft for hanging the rudder in support structure of Kajiatama shaft for rotatably supporting the rudder trunk by roller bearing, the roller bearing It has a self-aligning function that can receive both load and thrust load, and a fixing ring is fixedly fitted on the outer periphery of the rudder shaft above the roller bearing , and a step that protrudes to the inner periphery is formed on the ladder trunk below the fixing ring In addition, the present invention provides a support structure for a rudder axle characterized in that a fixing ring is placed on the step or placed with a slight gap .
[0006]
By adopting the above-described means, the present invention prevents the further sliding down by the fixing ring supported by the ladder trunk even if the roller bearing is damaged and the rudder axle tends to slide down.
[0007]
Further, in the above-mentioned means, the present invention is a means for forming a groove on the rudder shaft and fitting a fixing ring divided into two into the groove, and the roller bearing is a self-aligning roller bearing having a tapered inner ring. , Means for pushing the rudder axle into the self-aligning roller bearing by a push bolt standing in the axial direction of the fixing ring, means for superposing the cover mounted on the upper part of the ladder trunk and the upper surface of the fixing ring with a slight clearance Is also provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings (members having the same functions as those of the conventional example are denoted by the same reference numerals as above). FIG. 1 is a cross-sectional view of an upper portion of a ladder trunk showing an example of the present invention. The same applies in that a rudder axle 14 is rotatably supported on a ladder trunk 16 by a roller bearing 20. In this example, as the roller bearing 20, the inner ring having both the radial load and the thrust load and having the self-aligning function has a taper whose diameter is narrower by about 1/12 (therefore, the steering shaft) 14 also employs a self-aligning roller bearing that is tapered accordingly. However, the type of bearing is not limited to this.
[0009]
However, the difference is that the fixing ring 26 is fixedly fitted to the rudder shaft 14 at the upper part of the roller bearing 20 and the fixing ring 26 and the ladder trunk 16 are superposed in a plan view. Specifically, a step 16a is formed in the ladder trunk 16 where the fixing ring 26 is located, and the step 16a and the fixing ring 26 are superposed. The fixing ring 26 and the step 16a are classified into a contact type that maintains contact with lubricity and a non-contact type that does not contact.
[0010]
In this case, the fixing ring 26 needs to be fixed to the rudder axle 14, and there are various methods for this. For example, a circular fixing ring 26 may be fitted to the steering shaft 14 and tightened with screws (not shown) from the radial direction. However, as shown in FIG. 1, the most reliable and effective method is to form a groove 28 in the rudder shaft 14 and insert a fixing ring 26 that is divided into two or three parts into the groove 28 so that they are bolted to each other. It is a method of tightening and fixing with etc. (not shown).
[0011]
According to such a fixing ring 26, if the push bolt 30 is set up in the axial direction, the steering shaft 14 can be pushed into the self-aligning roller bearing 20 by pushing the push bolt 30. The nut that was needed can be abolished. In this case, the number of push bolts 30 is preferably about 12 to 36.
[0012]
By using the above-described fixing ring 26, even if the roller bearing 20 is damaged and the rudder axle 14 attempts to slide down, the fixing ring 26 is regulated by the step 16 a of the ladder trunk 16. It does not fall. Therefore, the position of the rudder plate 10 does not change so much, and no undue force is applied to the support arm 24 at the bottom.
[0013]
On the other hand, a cover 32 is attached to the upper portion of the ladder trunk 16, and it is preferable that the cover 32 and the upper surface of the fixing ring 26 are overlapped with a slight gap. This is because when upward force is applied to the rudder plate 10 for some reason, the upward movement of the rudder axle 14 can be suppressed to a slight extent.
[0014]
In addition to this, grease is injected into the roller bearing 20 from a grease injection hole 34 formed in the ladder trunk 16, and oil is placed at the upper and lower positions sandwiching the roller bearing 20 and the fixing ring 26 so that the grease does not leak. A seal 36 and a spacer ring 38 are provided. The fixing ring 26 is also formed with a flow hole 40 that allows the grease to flow. Further, a distance ring 42 is interposed between the outer ring of the roller bearing 20 and the rudder trunk 16 for positioning.
[0015]
【The invention's effect】
As described above, according to the present invention, even if the roller bearing supporting the rudder shaft is damaged and the rudder shaft is about to slide down, this is prevented by the fixing ring. Therefore, it is possible to avoid the situation where the rudder plate slides down, the support arm that receives the rudder plate breaks, or the rudder plate falls into the sea in the case of a suspended rudder and becomes impossible to steer, ensuring navigation safety. Is done.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a ladder trunk showing an example of the present invention.
FIG. 2 is a side view of the stern showing around the rudder plate.
FIG. 3 is a cross-sectional view of a main part of a conventional ladder trunk.
[Explanation of symbols]
10 Rudder plate 14 Rudder axle 16 Ladder trunk 16a stage 20 Roller bearing 26 Fixing ring 28 Groove 30 Push bolt 32 Cover

Claims (4)

In the support structure of the rudder axle that rotatably supports the rudder trunk on the rudder trunk with the rudder axle that suspends the rudder plate, the roller bearing has an automatic alignment function that can receive both radial load and thrust load , A fixed ring is fixedly fitted to the outer periphery of the rudder shaft above the roller bearing, and a step protruding to the inner periphery is formed on the ladder trunk below the fixed ring, and the fixed ring is brought into contact with the step or a slight gap. support structure of Kajiatama shaft, characterized in that carrying the have.   2. A structure for supporting a steering shaft according to claim 1, wherein a groove is formed in the steering shaft, and a fixing ring divided into two is fitted into the groove and fixed.   The roller bearing is a self-aligning roller bearing whose inner ring is tapered, and the rudder shaft is pushed into the self-aligning roller bearing by a push bolt standing in the axial direction of the fixed ring. The structure of the described rudder axle.   The rudder axle support structure according to any one of claims 1 to 3, wherein a cover attached to an upper portion of the ladder trunk and an upper surface of the fixing ring are overlapped with a slight gap therebetween.

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