JPH0228290Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a counter-rotating propeller device used as a propulsion device for ships.

[Conventional technology]

The third conventional marine contra-rotating propeller system
There is a model as shown in the figure, in which the inner shaft 3 that is rotationally driven by the main engine 10 is mounted on a thrust bearing 9 inside the main engine 10.
A rear propeller 1 is attached to the rear end, a tubular outer shaft 4 overlapping the inner shaft 3 is supported by a thrust bearing 8, and a front propeller is attached to the rear end. 2 is mounted so as to be located in front of the rear propeller 1.

Then, the rear propeller 1 and the front propeller 2
In order to reverse each other, the input side large gear 6c is
The output side large gear 5b is coaxially mounted on the front end of the outer shaft 4, while the output side large gear 5b is coaxially mounted on the inner shaft 3 via an elastic joint 7 so as to rotate in the same direction as the inner shaft 3. An interlocking gear mechanism M is provided between the input side large gear 6c and the output side large gear 5b to rotate both the large gears 6c and 5b in the reverse direction.

As shown in FIGS. 3 to 5, this interlocking gear mechanism M includes an output side small gear 5 that meshes with an output side large gear 5b.
a, an input side small gear 6a connected to the output side small gear 5a via a deflection shaft 14, and an idle gear 6b interposed between the input side small gear 6a and the input side large gear 6c. It consists of

In addition, in FIG. 3, the bearings of the small gears 5a, 6a, the idle gear 6b, and the large gears 5b, 6c are omitted from illustration.

In such a marine counter-rotating propeller device, the rear propeller 1 is directly connected to the main engine 10 through the inner shaft 3 and is rotationally driven, while the front propeller 2 is rotationally driven as follows.

That is, the torque whose variation has been smoothed by the elastic joint 7 is transmitted from the intermediate portion of the inner shaft 3 directly connected to the main engine 10 to the input side large gear 6c, and as shown in FIG. 5, is transmitted to the input side small gear 6a. is rotated in the same direction as the input side large gear 6c by the idle gear 6b. The rotation of the input side small gear 6a is transmitted to the output side small gear 5a via the deflection shaft 14, and as shown in FIG. Rotation in the opposite direction is transmitted.

As a result, the front propeller 2 becomes the rear propeller 1.
It is rotated in the opposite direction. At this time, the gear ratio of the above-mentioned gears is set appropriately, so that the front propeller 2 and the rear propeller 1 rotate in opposite directions at approximately the same rotational speed.

Therefore, in a ship equipped with a counter-rotating propeller device configured as described above, the propellers 1,
The rotational energy that was flowing out to the rear of the ship is recovered, and compared to a general ship with a single propeller,
The propulsion efficiency can be increased.

[Problem that the invention attempts to solve]

However, in the conventional marine counter-rotating propeller device as described above, the inner shaft 3 is only supported by the thrust bearing 9 in the main engine 10, so that the inner shaft 3 is deflected at the rear side of the thrust bearing 9. However, there is a problem in that the inner shaft 3 comes into contact with the outer shaft 4, causing problems.

Moreover, due to the above-mentioned deflection, the inner shaft 3
Since it rotates under a large bending stress, repeated stress acts on the inner shaft 3, causing the inner shaft 3 to
Another problem is that the service life of the device is shortened.

The present invention attempts to solve these problems, and is a counter-rotating marine propeller that prevents the occurrence of deflection of the inner shaft and reduces the bending stress acting on the inner shaft. The purpose is to provide equipment.

[Means for solving problems]

Therefore, the contra-rotating marine propeller device of the present invention has an inner shaft that is rotationally driven by the main engine, a rear propeller that is attached to the rear end of the inner shaft, and a tubular propeller that overlaps the inner shaft. It has an outer shaft and a front propeller attached to the rear end of the outer shaft and disposed in front of the rear propeller, and is coaxially connected to the inner shaft so that it can rotate in the same direction as the inner shaft. An interlocking gear mechanism is provided between the mounted input-side large gear and the output-side large gear coaxially mounted on the front end of the outer shaft to support the inner shaft. A bearing is disposed between the input-side large gear and the output-side large gear, and is characterized in that the bearing is structured in two pieces that can be disassembled.

[Effect]

In the marine counter-rotating propeller device of the present invention described above, since the inner shaft is supported between the input side large gear and the output side large gear, generation of deflection in the inner shaft is prevented.

〔Example〕

Below, a contra-rotating marine propeller device as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a vertical sectional view schematically showing the main parts thereof, and Fig. 2 is an exploded perspective view showing its bearings. be.

As shown in Fig. 1, the main engine 10 (see Fig. 3)
An inner shaft 3 that is rotatably driven by the main engine 10 is supported by a thrust bearing 9 (see Fig. 3), and a rear propeller 1 (see Fig. 3) is provided at the rear end.
is installed, and a tubular outer shaft 4 that overlaps the inner shaft 3 is supported by a thrust bearing 8, and a front propeller 2 (see Fig. 3) is attached to the front end of the rear propeller 1 at the rear end. It is attached to the position.

Then, the rear propeller 1 and the front propeller 2
In order to reverse each other, the input side large gear 6c is
The output side large gear 5b is coaxially mounted on the front end of the outer shaft 4, while the output side large gear 5b is coaxially mounted on the inner shaft 3 via an elastic joint 7 so as to rotate in the same direction as the inner shaft 3. An interlocking gear mechanism M is provided between the input side large gear 6c and the output side large gear 5b to rotate both the large gears 6c and 5b in the reverse direction.

This interlocking gear mechanism M includes an output side small gear 5a that meshes with an output side large gear 5b, and an output side small gear 5a that meshes with the output side large gear 5b.
The input side small gear 6a is connected to the input side small gear 6a via the deflection shaft 14, and the input side small gear 6a and the input side large gear 6c
Idle gear 6b (3rd, 5th
(see figure).

On the other hand, an inner shaft bearing 11 supporting the inner shaft 3 is provided between the input side large gear 6c and the output side large gear 5b.
As shown in FIG. 2, the inner shaft bearing 11 has a removable two-part structure consisting of an upper member 11a and a lower member 11b.

In addition, in this embodiment, as shown in FIG.
2 is disposed integrally with the inner shaft bearing 11, and this bearing 12 is also constructed in a removable two-piece structure consisting of an upper member 12a and a lower member 12b.

Furthermore, as shown in FIG.
c and the outer shaft 4 on the rear side of the output side large gear 5b.
It may be supported by a bearing 12 with a split structure, or
The small gears 5a, 6a and the idle gear 6b may be supported by a bearing 13 having a two-piece structure.

Since the contra-rotating marine propeller device of the present invention is constructed as described above, the rear propeller 1 is directly connected to the main engine 10 by the inner shaft 3 and is rotationally driven, while the front propeller 2 is It is rotated as follows.

That is, the torque whose variation has been smoothed by the elastic joint 7 is transmitted from the intermediate portion of the inner shaft 3 directly connected to the main engine 10 to the input side large gear 6c, and as shown in FIG. is rotated in the same direction as the input side large gear 6c by the idle gear 6b. The rotation of the input side small gear 6a is transmitted to the output side small gear 5a via the deflection shaft 14, and as shown in FIG. Rotation in the opposite direction is transmitted.

As a result, the front propeller 2 becomes the rear propeller 1.
It is rotated in the opposite direction. At this time, the gear ratio of the above-mentioned gears is set appropriately, so that the front propeller 2 and the rear propeller 1 rotate in opposite directions at approximately the same rotational speed.

Therefore, even in a ship equipped with the counter-rotating propeller device of the present invention, the rotational energy that was flowing out behind the propellers 1 and 2 can be recovered, as in the conventional case, and it can be used in a ship equipped with a general single propeller. The propulsion efficiency can be increased compared to the previous model.

On the other hand, since the inner shaft 3 is supported by the inner shaft bearing 11 between the input side large gear 6c and the output side large gear 5b, the occurrence of deflection in the inner shaft 3 is prevented, and the inner shaft 3 is The large bending stress caused by the inner shaft 3 is eliminated, the service life of the inner shaft 3 is extended, and the problems conventionally caused by contact between the inner shaft 3 and the outer shaft 4 are also eliminated.

Further, since the inner shaft bearing 11 or the bearings 12 and 13 are formed in a two-piece structure, inspection and maintenance of the inside thereof can be easily performed by removing the upper member 11a or 12a, etc.

The inner shaft bearing 11 can be assembled into the counter-rotating propeller device by inserting the inner shaft 3 with only the lower member 11b of the inner shaft bearing 11 installed, and then attaching its upper member 11a. It is done by twisting.

[Effect of idea]

As described in detail above, the marine contra-rotating propeller device of the present invention includes an inner shaft rotationally driven by the main engine, a rear propeller attached to the rear end of the inner shaft, and It has a tubular outer shaft that overlaps with the shaft, and a front propeller that is attached to the rear end of the outer shaft and disposed in front of the rear propeller, and is rotatable in the same direction as the inner shaft. An interlocking gear mechanism is provided between an input-side large gear coaxially mounted on the inner shaft and an output-side large gear coaxially mounted on the front end of the outer shaft, which rotates both the large gears in reverse rotation. , a bearing supporting the inner shaft is disposed between the input side large gear and the output side large gear,
The bearing has an extremely simple structure in which the bearing is split into two parts that can be disassembled, which prevents the inner shaft from deflecting, which prevents the inner and outer shafts from coming into contact with each other. This eliminates the problems caused by this, and reduces the fatigue of the inner shaft due to repeated stress that occurs with rotation, thereby extending the life of the inner shaft.

Further, since the bearing has a two-piece structure, there is an advantage that inspection and maintenance of the inside can be easily performed by removing the upper member.

[Brief explanation of drawings]

Figures 1 and 2 show a counter-rotating marine propeller device as an embodiment of the present invention. Figure 1 is a vertical cross-sectional view schematically showing its main parts, and Figure 2 is an exploded view showing its bearings. FIG. 3 is a perspective view, and FIGS. 3 to 5 show a conventional marine counter-rotating propeller device, FIG. 3 is a longitudinal sectional view thereof, and FIG. FIG. 5 is a schematic diagram for explaining the functions of the input side large gear, input side pinion gear, and idle gear. 1... Rear propeller, 2... Front propeller, 3
...Inner shaft, 4...Outer shaft, 5a...Output side small gear,
5b... Output side large gear, 6a... Input side small gear,
6b...Idle gear, 6c...Input side large gear,
7...Elastic joint, 8, 9...Thrust bearing, 10
... Main engine, 11 ... Inner shaft bearing, 11a ... Upper member, 11b ... Lower member, 12 ... Bearing, 12a
...Upper member, 12b...Lower member, 13...Bearing, 14...Deflection shaft, M...Interlocking gear mechanism.

Claims (1)

[Scope of utility model registration request] It has an inner shaft that is rotationally driven by the main engine, a rear propeller attached to the rear end of the inner shaft, a tubular outer shaft that overlaps the inner shaft, and a rear propeller attached to the rear end of the outer shaft. a front propeller disposed in front of the rear propeller; an input large gear coaxially attached to the inner shaft so as to rotate in the same direction as the inner shaft; and a front end of the outer shaft. An interlocking gear mechanism is provided between the input side large gear and the output side large gear coaxially mounted on the input side large gear, and an interlocking gear mechanism that rotates both large gears in reverse rotation with respect to each other. A counter-rotating propeller device for marine use, characterized in that the contra-rotating propeller device is disposed between a gear and a coaxial bearing and is configured in a two-piece structure that can be disassembled.