JPS6226196A - Counter-rotating propeller device - Google Patents

Abstract

PURPOSE:To simplify construction for improved propulsive efficiency and energy saving by providing a front propeller attached to the stern through a propeller driving shaft and a rear propeller attached to the rudder blade through a driving shaft and adapted to be rotated independently, coaxially and oppositely with respect to the front propeller. CONSTITUTION:When sea water flows around a front propeller 12, rotation thereof generates an alternating current in form of a rotational stream with torsion, and the rotational stream flowing into the rear propeller 13 rotating oppositely to the front propeller 12 has its rotating energy absorbed by the propeller 13, so that it flows out backward in form of a parallel stream. This allows effective collection of the rotating energy as thrust and also prevents oblique advance of the ship. Sea water flowing around the front and rear propeller bosses 21, 22 flows smoothly with no occurance of resistance, as the portions are substantially in the streamline shape. As the front and rear propellers are separately journaled, bearings, seal structures and driving means can be simplified, and coaxial arrangement thereof improves propulsive efficiency and permits energy-saving operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a contra-rotating propeller device as a propulsion device for a ship, etc., and in particular, the invention relates to a counter-rotating propeller device as a propulsion device for ships, etc., and in particular, the drive shaft of the front propeller extends rearward from the stern as in conventional ships. A contra-rotating propeller that can improve the propulsion efficiency of a ship as much as possible by having the drive shaft of the rear propeller extend forward from the rudder plate, and the front and rear propellers being coaxially arranged. It is related to the device.

[Conventional technology]

Generally, a structure as shown in FIG. 5 is known as a counter-rotating propeller device.

As shown in the figure, a propeller shaft 3 having a dual shaft structure is extended rearward from the stern portion of the hull 1 between the stern portion and the rudder plate 2 . This propeller shaft 3 supports a front propeller 5 with an outer shaft 4 and a rear propeller 7 with an inner shaft 6. At this time, the front propeller boss 8 has a larger diameter corresponding to the diameter of the outer shaft 4, and the rear propeller boss 9 has a smaller diameter than the front propeller boss 8, corresponding to the inner shaft 6.

A bearing device and a sealing device (not shown) are connected to the inner shaft 6.
and the outer shaft 4 and between the outer shaft 4 and the hull 1, respectively. In particular, the bearing device and the sealing device installed between the inner shaft 6 and the outer shaft 4 require a high degree of durability and precision since the two shafts 4.6 are reversed relative to each other.

In addition, the propeller drive device (not shown) is connected to the inner shaft 6.
and the outer shaft 4 in opposite directions.

The two-handed reversing propeller device having the above configuration operates as follows.

Seawater flowing into the front propeller 5 is pushed rearward by this propeller 5. At this time, the seawater gains energy from the rotation of the propeller 5 and turns into a rotating flow, flowing into the rear propeller 7.

The rotating flow flowing into the rear propeller 7 which rotates in the opposite direction to the front propeller 5 has its rotational energy efficiently absorbed by the propeller 7 and is pushed out to the rear of the hull as a parallel flow.

[Problems to be Solved by the Invention] However, the conventional contra-rotating propeller device has the following problems.

Since the propeller shaft 3 has a double shaft structure φ, (1) The inner shaft 6 and the outer shaft 4 and the outer shaft 4 and the hull 1 are each supported by bearings, but this bearing structure is very complicated. become. Furthermore, in the case of a bearing installed between the outer and inner shafts 4 and 6, a high degree of durability is required since the shafts 4 and 6 rotate in opposite directions.

(V Seal treatment is performed between the outer and inner shafts 4.6 and between the outer shaft 4 and the hull 1, but the seal structure is complicated like the above bearing, and it is attached to the outer and inner shafts 4.6fJ. A high degree of durability was required for the sealing materials used.

(3) Since the outer and inner shafts 4.6 must be rotated in opposite directions, there is a problem in that the drive device becomes complicated.

(4+ The diameter of the propeller boss 8 connected to the outer shaft 4 is large, which becomes a source of resistance and reduces propeller efficiency.

[Object of the Invention] The present invention was devised to effectively solve the problems in conventional counter-rotating propeller devices, and its purpose is to improve The front propeller was supported and driven by a drive shaft extending rearward from the stern hull, and the rear propeller was supported and driven coaxially with the front propeller by a drive shaft extending forward from the rudder plate. Therefore, it is an object of the present invention to provide a counter-rotating propeller device that has a simple structure, improves propulsion efficiency as much as possible, and can save energy.

[Summary of the Invention] In order to achieve the above object, the present invention provides a counter-rotating propeller device having a front propeller and a rear propeller coaxially between a stern part and a rudder plate, in which a propeller drive shaft is connected from the stern part to the rudder plate. A front propeller is provided through the steering plate, and a rear propeller is provided which rotates in the opposite direction on the same axis as the front propeller through a drive shaft from the rudder plate, and the front propeller and rear propeller are each rotated by independent drive shafts. The drive shaft of the rear propeller is supported by a steering plate located behind the front propeller.

[Example] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic side view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG.

As shown in the figure, the front propeller 12 is supported by a single drive shaft 14 extending rearward in the direction of the rudder plate 11 from a protrusion 23 at the stern of the hull 10 .

On the other hand, the rear propeller 13 is provided coaxially with the front propeller 12 and supported by a drive shaft 16 extending from the fixed steering plate 15 in the direction of the front propeller 12 .

Note that the rudder plate 11 is divided into a movable rudder plate 27 and a fixed rudder plate 15. A movable rudder plate 27 formed in a substantially U-shape is rotatably supported by a rudder shaft 17 hanging downward from the stern. The fixed rudder plate 15 is engaged with the recess of the movable rudder plate 27 and fixed to the rudder shaft 17. 18 is a rudder handle for operating the movable rudder plate 27. A motor 19 as a drive source is attached inside the fixed steering plate 15 and connected to a drive shaft 16 extending forward from the fixed steering plate 15. The motor 19 is of a hydraulic type or an electric type, and its power source is supplied from inside the hull 10 through a hollow hole 20 provided in the rudder shaft 17.

Front and rear propeller bosses 21, 22 and fixed rudder plate 1
5 is formed continuously from the protrusion 23 of the hull through the front and rear propeller bosses 21 and 22 to the fixed rudder plate 15, and these four parts form approximately one streamlined shape.

In addition, the generation of vortices is suppressed between the protrusion 23 of the hull and the front propeller boss 21, between the front and rear propeller bosses 21 and 22, and between the rear propeller boss 22 and the fixed rudder plate 15. Set it narrowly for this purpose.

Next, the operation of the present invention will be described.

When seawater flows into the vicinity of the front propeller 12, the rotation of the propeller 12 generates a rotational flow accompanied by twisting as a wake. The rotating flow flowing into the rear propeller 13, which rotates in the opposite direction to the front propeller 12, has its rotational energy absorbed by the rear propeller 13, becomes a parallel flow, and flows rearward.

This allows the rotational energy to be effectively recovered as thrust, and eliminates the ship's oblique behavior.

Furthermore, the seawater flowing near the front and rear propeller bosses 21 and 22 has a substantially streamlined shape, so it flows smoothly without any resistance.

Incidentally, FIGS. 3 and 4 are diagrams showing other embodiments.

As shown in FIG. 3, the drive shaft 24 is powered from a power source (not shown) in the hull 10 without providing the motor 19 in the fixed rudder plate 15.
The rear propeller 13 may also be driven via the bevel gear 25.

Also, Figure 4 shows the front propeller 12 or the rear propeller 1.
In order to facilitate the removal work when removing the propeller 3, a certain distance is provided between the front propeller boss 21 and the rear propeller boss 22, and a spacer 26 is inserted between them. The shape of this spacer 26 is the shape of the front and rear propeller bosses 2.
1.22 and is formed continuously and along a streamlined shape, and is attached to either the front or rear propeller boss 21.22.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) The front propeller is independently supported by a propeller drive shaft extending from the stern, and the rear propeller is independently supported by a propeller drive shaft extending from the rudder plate, resulting in a bearing structure and a seal structure. and the drive device can be simplified.

(2) The stern, front, and rear propeller bosses and fixed rudder plates are arranged coaxially to form a substantially streamlined shape, making it possible to improve propulsion efficiency and save energy. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention, FIG. 2 is a view taken along the line ■-■ in FIG. 1, and FIGS. 3 and 4 are schematic side views showing other embodiments. FIG. 5 is a schematic side view showing a conventional example. In the figure, 10 is the hull, 11 is the rudder plate, 12 is the front propeller,
13 is the rear propeller, 14.16 is the drive shaft, 19
is the motor. Patent Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative Patent Attorney Nobuo Tani Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a counter-rotating propeller device having a front propeller and a rear propeller coaxially between a stern part and a rudder plate, the front propeller is provided from the stern part via a propeller drive shaft, and the drive shaft is connected from the rudder plate to the front propeller. A counter-rotating propeller device comprising: a rear propeller that rotates in the opposite direction on the same axis as the front propeller.