JPH0531040Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a counter-rotating propeller device for a ship, and in particular a double-rotating propeller device having an inner shaft and an outer shaft that are driven to rotate in opposite directions at different rotational speeds. This invention relates to an inner/outer shaft interlocking device applied to a reversing propeller.

[Conventional technology]

In general, counter-rotating propellers often have an inner shaft and an outer shaft that rotate in opposite directions at the same rotation speed, and the interlocking device between the inner and outer shafts is usually configured accordingly. (See Figures 5-7).
When using such an interlocking device to drive the inner and outer shafts to rotate in opposite directions at different rotational speeds, the difference in rotational speed between the inner and outer shafts is adjusted by changing the number of teeth, diameter, etc. of the gears in the interlocking device.

For example, what is shown in FIG. 5 is a conventional internal and external shaft interlocking device for a counter-rotating propeller that employs a parallel shaft gear system.

As shown in FIG. 5, a rear propeller 09 is attached to the rear end of an inner shaft 02 that is rotatably driven by an engine (not shown) inside the hull, while an outer shaft 01 is disposed around the outer periphery of the inner shaft 02. A front propeller 010 is attached to the rear end. Then, the outer shaft 01 is
At the front of the outer shaft 01, it is connected to the inner shaft 02 via a parallel shaft gear type reversing mechanism 08a.

In this reversing mechanism 08a, the gear 06 has an outer shaft 0
At the front of the gear 06, it is attached and fixed to the inner shaft 02 via a fastening part 03 such as an elastic joint.
is adapted to mesh with an idle gear 04 rotatably supported at a fixed position on the hull side.

In order to transmit the rotational driving force of the idle gear 04 to the outer shaft 01, a power transmission gear system 07 is provided between the idle gear 04 and a gear 05 formed at the front end of the outer shaft 01. . This power transmission gear system 07 includes a gear 07a that meshes with the idle gear 04, and a gear 07b that meshes with the gear 05.
and a shaft 07c connecting gears 07a and 07b.

With the above-mentioned configuration, in the conventional counter-rotating propeller inner and outer shaft interlocking device shown in FIG. A portion is transmitted from the gear 06 to the idle gear 04 via the inner shaft 02 and the fastening portion 03, and drives the gear 07a to rotate in the same direction as the inner shaft 02 via the idle gear 04.

Since the rotational force of the gear 07a is transmitted from the shaft 07c and the gear 07b to the outer shaft 01 via the gear 05, the front propeller 010 is rotationally driven in the opposite direction to the rear propeller 09.

Furthermore, as shown in FIG. 6, there is also a conventional internal and external shaft interlocking device for counter-rotating propellers that employs an internal gear system.

The conventional example shown in FIG. 6 also has almost the same configuration as the conventional example shown in FIG. 5, but in this conventional example, the outer shaft 01 is
It is connected to the inner shaft 02 via an internal gear type reversing mechanism 08b.

In the reversing mechanism 08b, the sun gear 06'
is attached and fixed to the inner shaft 02 via a fastening portion 03 at the front of the outer shaft 01, and an internal gear 05' is formed at the front end of the outer shaft 01.

In order to transmit the rotation of the inner shaft 02 to the outer shaft 01, a plurality of sets of power transmission gear systems 07' are provided between the sun gear 06' and the internal gear 05' formed on the outer shaft 01. There is. This power transmission gear system 0
7' is a gear 07'a that meshes with the sun gear 06';
Gear 07'b meshing with internal gear 05' of outer shaft 01
and a shaft 07' connecting gears 07'a and 07'b.
It is composed of c.

Note that these gears 07'a, 07'b and shaft 07'c are rotatably and integrally supported at fixed positions on the hull side.

With the above-described configuration, even in the conventional counter-rotating propeller inner and outer shaft interlocking device shown in FIG. 6, the front propeller 010 rotates in the opposite direction to the rear propeller 09, as in the conventional example shown in FIG. Driven.

Furthermore, as shown in FIG. 7, there is also a conventional interlocking device for an inner and outer shaft for a counter-rotating propeller that employs a planetary gear system.

This conventional example also has almost the same configuration as each of the conventional examples shown in FIGS. It is connected to the inner shaft 02 via a mechanism 08c.

In this reversing mechanism 08c, the engine side internal gear 0
11a is the fastening portion 03 in front of the outer shaft 01.
This internal gear 01 is attached and fixed to the inner shaft 02 via
A plurality of engine-side planetary gears 012 meshing with 1a
a is rotatably supported at a fixed position on the hull side by a shaft 012b.

Further, a support portion 01a is formed at the front end of the outer shaft 01, and a plurality of propeller-side planetary gears 012b are pivotally attached to the support portion 01a via a support shaft 013, and these propeller-side planetary gears 012b teeth,
It is adapted to mesh with a propeller-side internal gear 011b fixed to the hull.

A sun gear 015 is located between the engine side planetary gear 012a and the propeller side planetary gear 012b.
A first gear is provided on the outer periphery of the front end of the sun gear 015 and meshes with the engine side planetary gear 012a.
A gear 015a is formed. Also, on the outer periphery of the rear end of the sun gear 015, there is a propeller-side planetary gear 01.
A second gear 015b that meshes with 2b is formed.

With the above-mentioned configuration, in this conventional example of the counter-rotating propeller inner and outer shaft interlocking device, the front propeller 010 is rotationally driven in the opposite direction to the rear propeller 09, as in each of the conventional examples shown in FIGS. Ru.

In each of the three conventional examples described above, the difference in rotational speed between the propellers 09 and 010 is adjusted by changing the number of teeth, diameter, etc. of the gears forming the device.

[Problem that the invention attempts to solve]

However, the conventional internal and external shaft interlocking devices for counter-rotating propellers described above are all configured with two rows of meshing gears using a two-stage reduction method, which increases the number of parts in the device. However, there are problems in that the structure becomes complicated and the cost required to produce the device increases.

Furthermore, since the structure of the device is large, there is also the problem that when the device is installed in a limited space such as a ship, the space cannot be used effectively.

Therefore, in order to solve these problems, we developed a counter-rotating system with a simple structure that allows the inner and outer shafts to rotate in opposite directions at different rotation speeds, thereby reducing the size and weight of the device and reducing manufacturing costs. As a propeller inner/outer shaft interlocking device, a device in which a single row of gears is meshed, as shown in FIG. 8, has been considered.

That is, as shown in FIG. 8, a rear propeller 29 is attached to the rear end of the inner shaft 22 which is rotatably driven by an engine (not shown) inside the hull.
A front propeller 30 is attached to the rear end of an outer shaft 21 disposed on the outer periphery of the propeller 2 . And the outer shaft 21
is connected to the inner shaft 22 at the front of the outer shaft 21 via a reversing mechanism 31 as a gear mechanism.

This reversing mechanism 31 is configured as a planetary gear mechanism, and a sun gear 27 is attached and fixed to the inner shaft 22 via a fastening portion 23 such as an elastic joint.

An internal gear 28 is disposed at the front end of the outer shaft 21.
It is arranged on the outer periphery of the inner shaft 22.

A plurality of planetary gears 26 are interposed between the internal gear 28 and the sun gear 27 and mesh with these gears 28 and 27.

These planetary gears 26 are each rotatably supported at a fixed position by a bearing pin 25 in a casing 24 fixed within the hull.

With such a configuration, the front propeller 30
It is rotationally driven in the opposite direction to the rear propeller 29 via the reversing mechanism 31 .

By appropriately setting the pitch circle diameter of the sun gear 27, the pitch circle diameter of the internal gear 28, and the pitch circle diameter of the planetary gear 26, the rear propeller 29 and the front propeller 30 are rotated so as to be opposite to each other at a desired gear ratio. It can be rotated in the direction of

In this way, by using a single row of meshing gears, the device can be made smaller and lighter, which greatly reduces the space occupied by the device, allowing for more effective use of space in the ship's hull, etc. In addition, the number of parts in the device is reduced and the structure is simplified, resulting in a significant reduction in manufacturing costs.

As described above, a number of advantages can be obtained by using a set of planetary gear mechanisms to interlock the inner shaft 22 and the outer shaft 21, but it is difficult to realize a counter-rotating propeller equipped with such an interlocking device. In order to achieve this, the bearing of the inner shaft 22 must also be considered.

In other words, in a normal uniaxial propeller mechanism, the 9th
As shown in the figure, two bearings 42a and 42b are provided near the rear propeller 41, and one bearing 43 is provided in the front (main engine side), and by adjusting the height of the front bearing 43, the propeller This prevents a large uneven contact between the shaft and the bearing surface at the rear stern tube bearings 42a and 42b, which are affected by the movement of the shaft. Therefore, even in the counter-rotating propeller shown in Fig. 8,
It is necessary to arrange a bearing that supports the inner shaft at the front (on the main engine side) and a bearing near the rear propeller as shown in FIG. In particular, the front bearing 33 is closer to the rear bearings 32a and 32b when it is disposed on the propeller side than on the fastening part 23 (see FIG. 8) such as an elastic joint, so that the shaft and the bearing surface are separated from each other. Great impact prevention effect. Accordingly, there has been a demand for the development of a specific means for arranging the bearing 33 in front of the inner shaft 22 closer to the propellers 29, 30 than the fastening portion 23.

The present invention was devised under these circumstances, and includes a single-row meshing type planetary gear mechanism as an interlocking device for the inner and outer shafts, and a planetary gear mechanism of the same type inside a casing with a hull that houses the planetary gear mechanism. It is an object of the present invention to provide an interlocking device for the inner and outer shafts for a counter-rotating propeller, which makes it possible to realize a simple and compact counter-rotating propeller mechanism by providing a bearing for the inner shaft integrated with a planetary gear mechanism.

[Means for solving problems]

For this reason, the internal and external shaft interlocking device for a counter-rotating propeller of the present invention includes an inner shaft that is rotationally driven by an engine, and an outer shaft that is reversely driven by the inner shaft via a gear mechanism, and the gear mechanism is , an internal gear provided inside a casing fixed within the hull, attached to the outer shaft and supported by a bearing attached to the casing; and an internal gear attached to the inner shaft via an elastic joint and attached to the casing. It is configured as a single-row meshing type planetary gear mechanism consisting of a sun gear supported by an attached bearing, and a planetary gear that meshes with the internal gear and the sun gear, and the planetary gear is inside the casing. A bearing that is rotatably supported by a bearing pin whose one end is attached to the casing and which supports the inner shaft is attached to a carrier that holds the other end of the bearing pin or to the inner circumference of the sun gear. Therefore, it is characterized in that it is disposed integrally with the planetary gear mechanism.

[Effect]

In the above-mentioned inner and outer shaft interlocking device for a counter-rotating propeller of the present invention, the inner shaft is rotationally driven by the engine, and the output torque of the engine is transmitted to the internal gear,
It is transmitted to the outer shaft through a planetary gear mechanism consisting of a sun gear and a planetary gear, and the outer shaft is driven to rotate in the opposite direction at a different rotation speed than the inner shaft. At this time, since the inner shaft is supported by a bearing provided integrally with the planetary gear mechanism, deformation of the inner shaft is suppressed. Moreover, the height adjustment of the inner shaft bearing is automatically performed in conjunction with the installation adjustment of the planetary gear mechanism.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Figures 1 and 2 show an interlocking device for the inner and outer shafts for a counter-rotating propeller as the first embodiment of the present invention, and Figure 1 is a side sectional view thereof. , Figure 2 is the first
Figures 3 and 4 are cross-sectional views taken in the direction of the - arrow in the figure, and Figures 3 and 4 show an interlocking device for the inner and outer shafts for a counter-rotating propeller as a second embodiment of the present invention. The figure is a sectional view taken along the - arrow in FIG. 3.

Similarly to the first embodiment of the present invention shown in FIG. A front propeller is attached to the rear end of the outer shaft 1 that is fitted onto the outside. Then, the outer shaft 1 is
At the front of the outer shaft 1, it is connected to the inner shaft 2 via a reversing mechanism 12 as a gear mechanism.

This reversing mechanism 12 is configured as a single-row meshing type planetary gear mechanism, similar to the one shown in FIG. 8, and is provided inside a casing 11 fixed inside the hull. As shown in FIGS. 1 and 2, the sun gear 7 inside the casing 11 is attached to the inner shaft 2 via the elastic joint 3 and supported by a bearing 11a attached to the casing 11.

At the front end of the outer shaft 1, an internal gear 8 is disposed inside a casing 11 so as to cover the outer periphery of the sun gear 7, and is supported by a bearing 11b attached to the casing 11.

A plurality of planetary gears 6 are interposed between the internal gear 8 and the sun gear 7 and mesh with both the gears 8 and 7.

These planetary gears 6 are each rotatably supported at a fixed position inside the casing 11 by a bearing pin 5 whose one end is attached to the casing 11. Note that the other end of each bearing pin 5 is fixed to a carrier 13.

In the present embodiment, a carrier 13 supported by a plurality of bearing pins 5 inside the casing 11 extends to the immediate vicinity of the inner shaft 2, and the carrier 13 is supported by a plurality of bearing pins 5 inside the casing 11. , a bearing 4 for supporting the inner shaft 2 is provided. In this way, the bearing 4 that supports the inner shaft 2 is provided integrally with the planetary gear mechanism inside the casing 11 via the bearing pin 5 and the carrier 13. In other words, inner shaft 2
is supported on the hull via a bearing 4, a carrier 13, a bearing pin 5 and a casing 11.

Note that the bearing 4 is a sliding bearing (journal bearing).

Since the inner and outer shaft interlocking device for a counter-rotating propeller according to the first embodiment of the present embodiment is configured as described above, output torque from an engine (not shown) is transmitted to the rear propeller via the inner shaft 2. The rear propeller is rotationally driven.

On the other hand, a part of the output torque is transmitted to the sun gear 7 via the inner shaft 2 and the elastic joint 3, and drives the sun gear 7 to rotate in the same direction as the inner shaft 2. Note that the elastic joint 3 is for protecting the planetary gear mechanism from rotational fluctuations of the inner shaft 2 that is rotationally driven by the engine.

Due to the rotation of the sun gear 7 described above, rotational driving force is transmitted to the internal gear 8 via the planetary gear 6, and together with the internal gear 8, the outer shaft 1 is rotationally driven in the direction opposite to the inner shaft 2. As a result, the front propeller is rotationally driven in the opposite direction to the rear propeller.

Then, the pitch circle diameter of the sun gear 7, the internal gear 8
By setting the pitch circle diameter of the planetary gear 6 and the pitch circle diameter of the planetary gear 6, the rear propeller and the front propeller can be driven to rotate in opposite directions at a desired speed ratio.

During such rotation of the inner and outer shafts 1 and 2, the inner shaft 2 is smoothly supported by the bearing 4 located a suitable distance behind the elastic joint 3, so that the inner shaft 2 is supported by the bearing 4, the carrier 13, and the casing 11. Since the inner shaft 2 is reliably supported by the hull through the inner shaft 2, deformation and whirling due to its own weight are suppressed, and uneven contact at the rear inner shaft bearing portion (not shown) is prevented.

In this way, since the bearing problem of the inner shaft is solved, it is possible to realize a counter-rotating propeller mechanism using a planetary gear mechanism as an interlocking device for the inner and outer shafts.

In addition, the planetary gear mechanism has a meshing row of gears of 1
Since it is constructed as a single-row meshing type, the entire device is miniaturized and manufacturing costs are reduced, and the bearing 4 of the inner shaft 2 is provided integrally with the planetary gear mechanism. , Bearing 4 inside the ship
There is an advantage that the height adjustment is automatically performed along with the installation adjustment of the planetary gear mechanism.

Next, the second embodiment of the present invention will be explained.
In this embodiment, as shown in FIGS. 3 and 4, the bearing 4' is disposed not on the carrier 13' but on the inner periphery of the sun gear 7' so as to be located almost on the same plane as the bearing 11a. Other than that, the configuration is similar to that of the first embodiment.

Note that a sliding bearing is also used as the bearing 4' in this embodiment.

Since the counter-rotating propeller inner/outer shaft interlocking device according to the second embodiment of the present invention is constructed as described above, it operates in substantially the same manner as the first embodiment, and substantially the same effects can be obtained.

During rotation, the inner shaft 2 to which the sun gear 7' is attached via the elastic joint 3 is supported by a bearing 4' inside the sun gear 7', which rotates in the same direction and at the same speed as the inner shaft 2. Since the bearing 4' and the inner shaft 2 do not slide, the lubricating oil that enters between the inner shaft 2 and the bearing 4' due to the rotation of the inner shaft 2 and the bearing 4' and the inner shaft 2 and the bearing 4' move relative to each other, and a lubricating oil film having the required thickness is reliably formed between the inner shaft 2 and the bearing 4'.
This prevents deformation. In particular, since the bearing 4' is directly supported by the hull via the bearing 11a and the casing 11, there is an advantage that the inner shaft 2 can be supported extremely reliably.

It should be noted that the first embodiment and the second embodiment may be combined as appropriate, and an inner part is provided inside the sun gears 7, 7' so as to be on the same plane as the planetary gears 6 and the internal gears 8. A bearing for the shaft may be provided.

[Effect of idea]

As described in detail above, according to the interlocking device for counter-rotating propellers of the present invention, the inner shaft is rotationally driven by the engine, and the outer shaft is driven in reverse by the inner shaft through a gear mechanism. The gear mechanism is provided inside a casing fixed within the hull, and includes an internal gear mounted on the outer shaft and supported by a bearing attached to the casing, and an internal gear connected to the inner shaft through an elastic joint. The planetary gear mechanism is configured as a single-row meshing type planetary gear mechanism consisting of a sun gear mounted on the casing and supported by a bearing attached to the casing, and a planetary gear that meshes with the internal gear and the sun gear. is rotatably supported inside the casing by a bearing pin whose one end is attached to the casing, and the bearing supporting the inner shaft is connected to the carrier holding the other end of the bearing pin or the inner shaft of the sun gear. Due to the simple structure of being installed on the periphery and integrated with the planetary gear mechanism, the inner shaft is properly supported at the required locations within the interlocking device, preventing problems due to deformation of the inner shaft. This has the effect of making it possible to realize a lightweight and compact inner/outer shaft interlocking device.

In addition, the planetary gear mechanism has a meshing row of gears of 1
Since it is configured as a single-row meshing type, the entire device is miniaturized and manufacturing costs are reduced.In addition, since the inner shaft bearing is provided integrally with the planetary gear mechanism, it can be easily used inside a ship. There is an advantage that the height adjustment of the bearing is automatically performed along with the installation adjustment of the planetary gear mechanism.

[Brief explanation of drawings]

Figures 1 and 2 show an interlocking device for the inner and outer shafts for a counter-rotating propeller as a first embodiment of the present invention. Figures 3 and 4 show a contra-rotating propeller inner and outer shaft interlocking device as a second embodiment of the present invention; Figure 3 is a side sectional view thereof, and Figure 4 is the same as in Figure 3. - is a cross-sectional view in the direction of arrows;
5 to 7 are side sectional views showing conventional interlocking devices for contra-rotating propellers, and FIG. FIG. 9 is a side sectional view of the ninth
The figure is a schematic diagram showing a bearing portion of a uniaxial propeller mechanism, and FIG. 10 is a schematic diagram showing required bearing locations of a counter-rotating propeller. 1... Outer shaft, 2... Inner shaft, 3... Elastic joint,
4, 4...bearing, 5...bearing pin, 6...planetary gear, 7,7...sun gear, 8...internal gear, 11...
...Casing, 11a, 11b...Bearing, 12...
...Reversing mechanism, 13,13...carrier.

Claims (1)

[Scope of utility model registration request] It has an inner shaft that is rotationally driven by an engine, and an outer shaft that is reversely driven by the inner shaft via a gear mechanism. an internal gear attached to a shaft and supported by a bearing attached to the casing; a sun gear attached to the inner shaft via an elastic joint and supported by a bearing attached to the casing; It is configured as a single-row meshing type planetary gear mechanism consisting of a planetary gear that meshes with a sun gear, and the planetary gear is rotatably supported inside the casing by a bearing pin whose one end is attached to the casing. Further, the bearing for supporting the inner shaft is disposed integrally with the planetary gear mechanism by being attached to a carrier that holds the other end of the bearing pin or to an inner peripheral portion of the sun gear. Inner and outer shaft interlocking device for counter-rotating propellers.