JPH0834397A - Connecting structure of rudder plate and rudder shaft - Google Patents

Abstract

PURPOSE:To obtain a pressing force for tapered engagement of a rudder shaft and a rudder plate easily in a rudder in which the rudder shaft is taper-fitted closely to the rudder plate. CONSTITUTION:A tapered part 16 is formed on a rudder shaft 14, and fitted closely into a tapered hole 20 formed in a rudder plate to connect the rudder plate to the rudder shaft 14. Also an auxiliary shaft 18 is inserted into an inserting hole formed in the rudder plate by extending the auxiliary shaft 18 to the top end side of the tapered part 16, a seal liner 26 is fitted closely to the top end of the auxiliary shaft 18, and a hydraulic cylinder with a seal liner 26 as a piston is formed at the lower end of the inserting hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a rudder blade and a rudder shaft in a relatively small suspension rudder.

[0002]

2. Description of the Related Art Conventionally, there have been the following two structures for connecting a rudder blade and a rudder shaft in a suspension rudder. The first is flange coupling in which a flange is provided on each of the joint surfaces of the rudder blade and the rudder shaft, and the flanges are fastened with bolts or the like. The second is a welding structure in which the rudder blade and the rudder shaft are directly welded and integrated.

[0003]

In the former case, there is a drawback that the flange becomes a resistance against water and the propulsion efficiency is lowered.
In particular, recently, the speed of ships has been increased, so that the flanges are inevitably large and the efficiency is further reduced.
In the latter case, when it comes to a material that can be welded, it is often the case that a material with high strength cannot be expected.
Also in this case, this defect is further promoted as the speed is increased.

Therefore, in a large rudder or the like, a method of obtaining a necessary frictional force by taper fitting is used, but a very large pushing force is required to properly perform the taper fitting. For this reason, a pushing jig or the like is provided inside the rudder blade, but there is a problem that such a pushing jig cannot be incorporated in a small rudder due to space limitations.
The present invention solves such a point, and enables taper coupling to obtain a necessary pushing force even with a small rudder.

[0005]

Under the above problems, the present invention provides a rudder shaft and a rudder shaft by forming a taper portion in the rudder shaft and fitting the taper portion into a tapered hole formed in the rudder plate. For coupling, the auxiliary cylinder is extended to the tip side of the taper part, and the auxiliary shaft is inserted into the insertion hole formed in the rudder plate.The seal liner is fitted to the tip of the auxiliary shaft, and the seal liner serves as a piston. And a rudder blade and a rudder shaft are formed at the lower end of the insertion hole.

[0006]

The present invention takes the above means,
That is, since the hydraulic cylinder is constructed between the rudder shaft and the rudder plate, the pushing force required for the taper fitting can be obtained by the hydraulic pressure.

[0007]

FIG. 2 is a sectional view showing the relationship between a rudder blade and a rudder shaft according to an embodiment of the present invention. A hub 12 is formed in the rudder shaft insertion portion of the rudder blade 10 and the hub 12 is steered. The shaft 14 is inserted. At this time, the tapered portion 16 is provided on the rudder axle 14.
And a straight auxiliary shaft 1 below it.
8 is extended and inserted into the tapered hole 20 and the insertion hole 22 formed in the corresponding portion of the rudder blade 10, respectively.

As described above, a considerable pushing force is required to press the taper portion 16 into the taper hole 20 exactly. However, the present invention solves this problem as follows. FIG. 1 is a cross-sectional view of the main part thereof. A hole 24 having a diameter larger than the diameter of the insertion hole 22 is formed in the lower end of the hub 12, and a seal liner 26 slidably fitted in the hole 24 is provided. It is fitted to the lower end of the auxiliary shaft 18.

In this case, the seal liner 26 is the auxiliary shaft 18
It is fitted so as to be slidable with respect to and is adjusted by the nut 28. Further, the seal liner 26 is formed with a small hole 30 penetrating in the radial direction. This allows holes 24
The chamber constituted by the seal liner 26 and the seal liner 26 is sealed except for the small hole 30, and when pressure oil is supplied to the chamber, a hydraulic cylinder in which the seal liner 26 serves as a piston is constructed. Become.

Therefore, when the rudder shaft 14 is inserted through the rudder blade 10, the seal liner 26 is fitted (the nut 28 is screwed in), and pressure oil is applied to the small hole 30 by the hand pump 32 or the like. When supplied, the hydraulic cylinder operates and the rudder axle 14 is pushed downward. When the required amount of pushing is obtained, the rudder blade 10 is completely connected to the rudderstock 14 by tightening the nut 28 (the pressure oil naturally flows by removing the piping between the hand pump 32 and the small hole 30). Overtaken).

In this example, the taper portion 16 and the taper hole 2 are provided.
A keyless fitting in which power transmission with 0 is performed by frictional force between the two is shown, but at this time, a structure is provided to make the movement of the tapered portion 16 light and smooth. That is, some oil grooves 34 which communicate with each other are formed in the inner circumference of the tapered hole 20, and pressure oil is supplied to the oil grooves 34 by the hunt pump 32 or the like. This is because the pressure oil acts as a lubricating oil to lighten the insertion / removal of the rudderstock 14. However, such a structure is not essential to the present invention.

FIG. 3 is a cross-sectional view of an essential part showing another embodiment of fitting the taper portion 16 and the taper hole 20. In this embodiment, a key is provided between the taper portion 16 and the taper hole 20. 36 shows a key fitting in which 36 is interposed to achieve power transmission. The applicability of the present invention is not hindered even if the taper fitting has such a structure.

In addition to the above, in the above, there is a concern that pressure oil may leak, that is, the contact surface between the inner and outer circumferences of the seal liner 26 and the auxiliary shaft 18 and the hub 12, the auxiliary shaft 18 and the insertion hole 22.
An O-ring 38 for sealing is attached to each of the contact surface with the, the contact surface between the rudder shaft 14 and the upper end of the hub 12, and the like.

By the way, the hub 12 in this embodiment has a structure in which the upper boss 12a and the lower boss 12b are connected by welding with the pipe 12c, but this is taken into consideration in terms of accuracy and cost. However, the present invention is not limited to this. Further, although the taper portion 16 and the auxiliary shaft 18 of the rudder shaft 14 are shown as having an integrated structure, they may be separately provided and connected by a screw or the like.

[0015]

As described above, according to the present invention, the simple hydraulic cylinder for deriving the pushing force of the rudder shaft between the lower end of the rudder shaft and the rudder blade is constructed. Therefore, although a large pushing force is required, the rudder blade and the rudder shaft can be connected by the taper fitting that can obtain a strong connection. Further, since the rudder shaft penetrates through the rudder blade, it also serves to reinforce the rudder blade. For this reason, it is possible to cope with the speedup without making the rudder shaft and the like unnecessarily thick.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a relationship between a rudder blade and a rudder shaft showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a relationship between a rudder blade and a rudder shaft showing an embodiment of the present invention.

FIG. 3 is a sectional view of an essential part showing the relationship between a rudder blade and a rudder shaft showing another embodiment of the present invention.

[Explanation of symbols]

 10 rudder plate 14 rudder shaft 16 taper portion 18 auxiliary shaft 20 taper hole 22 insertion hole 26 seal liner

Claims (3)

[Claims] 1. A rudder shaft is formed with a taper portion, and the auxiliary shaft is extended to the tip end side of the taper portion in order to connect the rudder plate and the rudder shaft by fitting the taper portion into a taper hole formed in the rudder plate. And the auxiliary shaft is inserted through the insertion hole formed in the rudder blade, and the seal liner is fitted at the tip of the auxiliary shaft, and the hydraulic cylinder using the seal liner as a piston is formed at the lower end of the insertion hole. And the rudder axle coupling structure. 2. The connecting structure for a rudder blade and a rudder shaft according to claim 1, wherein the tapered portion and the tapered hole are keyless fitted. 3. The structure for connecting a rudder blade and a rudder shaft according to claim 1, wherein the tapered portion and the tapered hole are key-fitted.