JPH05475Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a vane foil mounting structure in a relatively small propeller device.

(b) Conventional technology It is said that only about 50% of the supplied energy is converted into propulsive force in a ship's propeller device.

Therefore, various efforts have been made to improve this efficiency.

One of them has been proposed (Japanese Patent Application No. 23854/1973) in which a type of impeller called a vane wheel is attached to the rear of a normal propeller.

In other words, the propeller twists the water as it rotates and kicks it backwards, but we focused on the fact that the energy of this water kicked out backwards does not contribute to the generation of propulsive force. This is collected by a part of the vane foil (inner periphery) and used as its rotational drive source.A part of this vane foil (outer periphery) is also formed with a part that generates thrust force, and the effect of this part is The aim is to increase the propulsion force by

(c) Problems that the invention aims to solve However, although this idea could be proven theoretically, there were many problems that needed to be solved before it could be put into practical use.

In other words, this includes matters such as the shape and structure of the vane foil, as well as its material, strength, installation location, etc., but in addition, in terms of actual construction, how should the vane foil be assembled? The question of whether or not to install it has emerged as a very important specific matter.

In this regard, the following two methods are generally considered.

The first method is to use a conventional propeller shaft and attach a vane foil to it. In this case, the length of the propeller shaft (the length of the part of the propeller that protrudes to the rear) to which the vane foil should be attached is , is usually not enough as it is, so at the rear of the propeller shaft,
A new extension shaft was added by sewing a flange to this propeller boss, and a vane foil was attached to this part. However, this method has disadvantages in that it requires new machining of flange holes for attachment, is weak in strength, and is difficult to remove cores, etc.

The next option is to replace the propeller shaft itself with a longer one when installing the vane foil, but although this method is superior in terms of centering and strength, it is time-consuming to replace. .

(d) Means for solving the problem This invention was devised against this background, and the following measures are taken to solve the problem.

That is, in addition to forming a tapered part near the rear end of the propeller shaft, the diameter of which becomes smaller toward the rear, a threaded part is formed at the rear of the tapered part, and the propeller boss of the propeller is inserted into the tapered part, while a cap nut is inserted into the threaded part. In a propeller device in which the propeller boss is firmly fitted to the tapered portion by tightening the cap nut, a screw shaft is screwed to the threaded portion instead of the cap nut, and a bearing is attached to the outer periphery of the screw shaft. It is characterized by a vane foil fitted through the .

(E) Effect As a result, the threaded shaft is screwed and fixed to the propeller shaft, so the cores of both can be easily drawn out, and no new machining that requires precision and time is required.

By appropriately increasing the length of the screw shaft, it can also play the role of an extension shaft to some extent, so this type is sometimes applied to relatively small propeller devices, improving strength and rigidity. This allows sufficient mounting space to be secured without lowering the surface.

(f) Example An example of this invention will be described below based on the drawings. Of the attached drawings, FIG. 1 is a partial vertical sectional view of a propeller device showing the main part of this invention, and FIG. FIG. 1 is a cross-sectional view of FIG. 1, FIG. 3 is a side view of the stern area, and FIG. 4 is a side view of the stern area of a conventional example.

The stern part of the vessel is shown in Figures 1, 3 and 4.
As shown in the figure, a propeller shaft 2 protrudes obliquely backward and downward from the bottom of the hull 1, and its rear end is supported by a bearing 4 provided at the lower end of a shaft bracket 3 that also protrudes from the hull 1. At the same time, a propeller 5 is attached to the rear end.

That is, in addition to forming a tapered portion 2a with a smaller diameter toward the rear at the rear end of the propeller shaft 2,
A threaded portion 2b is also formed behind it. and,
A similarly tapered hole formed at the center of the propeller boss 6 provided at the center of the propeller 5 is fitted into this tapered part 2a, and a cap nut 7 or the like is screwed into the threaded part 2b at the rear thereof. By tightening the screws, the propeller 5 was fixed to the propeller shaft 2 (see Figure 4). Therefore, in addition to serving as a nut for tightening the propeller boss 6, the cap nut 7 also serves as a cap to prevent water from entering the threaded portion 2b.

As is well known, the propeller 5 has approximately three to eight propeller blades 8 projecting radially from a propeller boss 6, and a rudder 9 for steering is provided behind the propeller blades 8. It is something.

By the way, the vane foil 10 is provided behind the propeller 5 and in front of the rudder 9.

According to recent research, this vane foil 10 is given a diameter Dv larger than the diameter Dp of the propeller 5, as shown in FIG. or a central portion 11 having a slightly smaller diameter D′v
and the outer circumferential portion 12 having a length of Dv-D'v outside of it are designed to have different pitches.

In other words, the pitch of the center portion 11 receives the water flow kicked out backward from the propeller 5 and functions as a turbine portion that rotates the vane foil 10 itself, and the pitch of the outer peripheral portion 12 converts this rotational force into a thrust force. Each of them has been carefully designed to work as a propeller section that converts it into a. As a result, a propeller with a narrow width was adopted, as shown in FIG. It is an impeller (vane) with a large number of blades.

On the other hand, the mounting structure of the vane foil 10 is constructed as follows in this invention.

First, the threaded portion 2b of the propeller shaft 2 is pressed so as to press the propeller boss 6 against the tapered portion 2a of the propeller shaft 2.
The cap nut 7 which is screwed into the cap nut 7 is removed, and instead, a screw shaft 15 having a thread formed on the inner periphery to be screwed into the threaded portion 2b is screwed into the screw shaft 15. Note that this screw shaft 15 is
Since it also has the role of tightening this and fixing the propeller boss 6 to the propeller shaft 2,
Hexagonal or square spanner engagement part 15 at the rear end etc.
a (see Figure 2).

Next, attach the bearing 1 to the outer periphery of the screw shaft 15.
The vane foil 10 is fitted through the hole 6.

That is, as shown in FIG. 1, seals 17 are installed in the front and rear between the outer periphery of the screw shaft 15 and the inner periphery of the foil boss 14 of the vane foil 10, and an appropriate number and type of bearings 16 are interposed in a watertight manner. By doing so, the vane wheel 10 is rotatably supported with respect to the propeller shaft 2. In addition, in order to prevent the bearing 16 and seal 17 from falling off, apply a suitable sleeve 1 to the corresponding part.
8 and 19 are press-fitted, and a space 20 is provided at the rear end of the threaded portion 2b and inside the screw shaft 15, and this space 20 is used as a grease filling chamber, and the bearing 16 is fitted into this space 20. There is a grease passage 2 between the outer peripheral part of the screw shaft 15
Let's communicate through 1.

Furthermore, a cap 2 is installed behind the screw shaft 15.
2, insert the set screw 23 into the center of the screw, and screw the tip into the screw hole 2c formed in the threaded portion 2b of the propeller shaft 2.
To prevent the screw shaft 15 from loosening.

(g) Effects of the device As described above, this device forms a tapered portion 2a with a smaller diameter toward the rear end of the propeller shaft 2, and also forms a threaded portion 2b at the rear of the tapered portion 2a, which makes the propeller shaft 2 narrower.
While inserting the propeller boss 6 into the tapered part 2a, screw the cap nut 7 into the threaded part 2b, and tighten the cap nut 7 to securely fit the propeller boss 6 into the taper part 2a. This propeller device is characterized in that a screw shaft 15 is screwed into the threaded portion 2b instead of the cap nut 7, and a vane foil 10 is fitted around the outer circumference of the screw shaft 15 via a bearing 16. , the vane foil 10 can be attached to the existing propeller device as is.

In other words, all you have to do is remove the existing cap nut 7, fit the screw shaft 15 in its place, and attach the vane foil 10 to the outer periphery of the screw shaft 15. 2b).

In this case, the threaded shaft 15 is screwed into the threaded portion 2b of the propeller shaft 2, and since it is possible to overhang the shaft to some extent backward, the centering of both is good, and this As long as it is applied to a small propeller device, sufficient installation space can be secured without significantly reducing the strength.

Note that the screw portion 2b of the propeller shaft 2 has the following:
A screw hole 2c is required for inserting the set screw 23, but this can be formed in advance when machining the center hole during machining of the propeller shaft 2, but it may be formed later. However, it can be done very cheaply and easily because it only requires a small tap hole, only one tap hole, and does not require precision.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention,
Figure 1 is a partial vertical sectional view of the propeller device showing the main parts of this invention, Figure 2 is a cross-sectional view of Figure 1, Figure 3 is a side view of the stern, and Figure 4 is the conventional example. It is a side view of the stern area. Code, 2...Propeller shaft, 2a...Tapered part, 2b...Threaded part, 5...Propeller, 6...
Propeller boss, 7... Cap nut, 10... Vane foil, 15... Screw shaft, 16... Bearing.

Claims (1)

[Scope of utility model claims] In addition to forming a tapered part 2a near the rear end of the propeller shaft 2, the diameter of which becomes smaller toward the rear, a threaded part 2b is formed behind the tapered part 2b, and the propeller boss 6 of the propeller 5 is fitted into the tapered part 2a. 2
In a propeller device in which the propeller boss 6 is firmly fitted to the tapered portion 2a by screwing a cap nut 7 into the cap nut 7 and tightening the cap nut 7, the screw shaft 15 is attached to the threaded portion 2b instead of the cap nut 7. This screw shaft 15
The vane wheel 1 is attached to the outer circumference of the vane wheel 1 via a bearing 16.
A mounting structure for a vane foil in a propeller device, characterized in that a vane wheel is fitted with a vane wheel.