JP2591912Y2 - Shaft structure of marine contra-rotating propeller device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contra-rotating propeller device for a marine vessel, and more particularly to an improvement in a bearing portion of an outer shaft thereof.

[0002]

2. Description of the Related Art A front propeller is mounted on a rear end of a hollow outer shaft, and an inner shaft is disposed concentrically inside the outer shaft and has a rear propeller mounted on a rear end. 2. Description of the Related Art There has been conventionally known a marine contra-rotating propeller device configured to rotate the above-described inner shaft and outer shaft in directions opposite to each other.

One example will be described with reference to FIGS. 2 and 3.
In FIG. 2, reference numeral 1 denotes a main engine, and the main engine 1
The rear propeller 3 is connected to the output shaft 1a via the inner shaft 2 so as to be directly driven, while the outer shaft 5 is connected to the outer shaft 5 via the star type planetary gear type reversing gear device 6. The connected front propeller 4 is connected to an output shaft 1 a of the main engine via an elastic joint 7 so that the front propeller 4 rotates in a direction opposite to that of the main engine 1.
The elastic joint 7 is provided to protect the tooth surface of the reversing gear device 6 from the fluctuation torque of the main engine 1.

The front end of the inner shaft 2 is formed in a tapered shape as shown in FIG. 3 and is fitted with an assembling flange 8. The assembling flange 8 is connected to the output shaft 1 a of the main engine 1 and the elastic joint 7. /> is coupled to the body. Reference numeral 71 denotes an output shaft of the elastic joint, which is connected to the input shaft 61 of the reversing gear device 6. Reference numeral 61a denotes a sun gear formed integrally with the input shaft 61, and the sun gear 61a meshes with the planetary gear 63. The planetary gear 63 is supported by a planetary shaft 65 fixed to the casing 9, the internal gear 64 on the output shaft 67 is meshed with the planetary shaft 63, and the output shaft 67 is configured to rotate in the opposite direction to the main engine 1. ing.

[0005] a pair of input shaft bearings 62a so as to rotatably supporting the input shaft 61, 62b are disposed at an interval _{L 2.} Reference numeral 68 denotes an output shaft bearing, and reference numeral 66 denotes a fixing ring. The fixing ring fixes the planetary shaft 65 by a plurality of rings, and is connected to an arm 69 fixed to the casing 9 to thereby form a planetary gear. It functions to hold the position of 63 correctly.

[0006] The weight of the body of the elastic joint 7 according to the output shaft 71 of the assembly flange 8 and the elastic joint 7. On the other hand, coupled to the output shaft 71 reversing gearbox 6 of the input shaft 6
1 is provided with a sun gear 61a, so that an elastic joint
The input shaft 61 by the weight of the body 7 is inclined sun gear 6
A pair of input shaft bearings 62 is provided so that the tooth contact of 1a does not deteriorate.
a, 62b.

[0007]

The shaft structure of the conventional marine contra-rotating propeller device as described above has the following problems. (1) Since the weight of the elastic joint is considerably large, when supporting with _two bearings of the input shaft, unless the distance L2 between the input shaft bearings is made large, the inclination angle with the input shaft is too large or the bearing load is large. turn into. (2) The meshing accuracy of the sun gear and the planetary gear, that is, the inclination angle of the input shaft bearing, must be strictly controlled. If the accuracy is poor, the planetary gears may be damaged. In the worst case, the reversing gear device cannot be used, resulting in a serious accident in which the navigation of the ship becomes impossible. However, it is difficult to mount the above-mentioned two input shaft bearings on the casing as designed, and it is difficult to confirm the mounting accuracy thereof, which poses a risk of a serious accident. (3) in order to equip two input shaft bearing to the input shaft, the total length of the result, the reversing gearbox overall length L ₁ increases and the shafting system also becomes long. In this case, measures such as enlarging the engine room and shrinking the hold space are necessary, which impairs the economy of the ship. Further, the weight of the reversing gear device itself increases, and the cost also increases.

The present invention seeks to solve such a problem. One input shaft of the reversing gear device is provided at each of two front and rear positions of a sun gear disposed on the input shaft. by supported by the front bearing and rear bearing, by increasing the distance between the two bearings supporting the input shaft
An object of the present invention is to provide a shaft structure of a marine contra-rotating propeller device capable of shortening the entire length of a reversing gear device while suppressing deflection of an input shaft due to the weight of an elastic joint body .

[0009]

Means for Solving the Problems] To achieve the above object, the axial structure of the marine contra-rotating propeller unit of the present invention includes an assembly flange attached to the output shaft of the engine, mounted on the assembling flange An elastic joint, a hollow outer shaft having a front end connected to the elastic joint via a star type planetary gear reversing gear device and a front propeller attached to a rear end, and inside the outer shaft. The star type planetary gear type , which is provided concentrically with the inner end and has a front end connected to the output shaft of the engine via the assembling flange and a rear end provided with a rear propeller. While the input shaft of the reversing gear device is connected to the output shaft of the elastic joint,
A sun gear of the star-type planetary gear reversing gear device is disposed on the input shaft, and the input shaft has two outer circumferential portions, one at the front side and the other at the rear side of the sun gear. The rear bearing is supported by a fixed ring and the fixed ring is
It is characterized in that one end is fixed to an arm fixed to the casing of the star-type planetary gear reversing gear device.

[0010]

[Action] In the axial structure of the above-mentioned marine contra-rotating propeller unit of the present invention, the input shaft of the star planetary gear type reversing gear unit, the front side and rear side of the sun gear disposed on the input shaft 2 Because it is supported at each point, the distance between the two bearings that support the input shaft can be increased, and if the weight of the main body of the elastic joint or the output shaft is applied to the input shaft, the inclination of the input shaft can be kept small. Become. Out and the body of the elastic coupling fixed <br/> Li in g in particular support the rear bearing via the output shaft of the elastic coupling
Acts to support the weight of the force shaft .

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a bearing of a contra-rotating marine propeller apparatus according to an embodiment of the present invention. FIG. 2 in FIG.
The same reference numerals as those in FIG. 3 and FIG. 3 indicate substantially the same members.

Also in this embodiment, a hollow outer shaft 5 having a front propeller mounted on a rear end thereof, a hollow propeller 5 disposed coaxially within the outer shaft 5 and a rear propeller mounted on the rear end. An outer shaft 2 is provided, and the inner shaft 2 and the outer shaft 5 are configured to be driven to rotate in opposite directions.

That is, the front end tapered portion of the inner shaft 2 having a rear propeller (not shown) attached to the rear end portion is fitted to the tapered portion of the assembling flange 8, and the assembling flange 8 is connected to the output shaft 1a of the main engine and the body of the elastic joint 7 is coupled. An output shaft 71 of the elastic joint 7 is connected to an input shaft 6 of a star-type planetary gear type reversing gear device (hereinafter referred to as “reversing gear device”) 6.
Connected to one.

A planet shaft 6 having one end fixed to a casing 9
5, a planetary gear 63 is supported. The planetary gear 63 is composed of a sun gear 61a formed at the rear end of the input shaft 61 and an internal gear 6 formed at the front end of the output shaft 67 of the reversing gear device 6.
4, the internal gear 64 is connected to the external shaft 5 via the output shaft 67.
And a front propeller (not shown) is driven to rotate in a direction opposite to the output shaft 1a of the main engine.

The fixed ring 11 is mounted on the free end of the planet shaft 65. The fixing ring 11 is firmly supported on the casing 9 via an arm 69 and has a planetary gear 63.
The position accuracy of is maintained.

On the other hand, the input shaft 61 of the reversing gear unit 6 extends rearward from the position of the sun gear 61a, and is supported by a rear bearing 10a near its rear end.

The rear bearing 10a is disposed at the front end of the output shaft 67 of the reversing gear device 6 and is disposed inside the internal gear 64 meshing with the sun gear 61a. And is supported by the casing 9. The arm 69 is firmly fixed to the casing 9.

Further, the input shaft 61 is supported by a single front bearing 10b in front of the sun gear 61a.

As described above, in this embodiment, the input shaft 61 of the reversing gear device 6 has the front bearing 10b and the rear bearing 10a on both the front side and the rear side of the sun gear 61a.
Because it is configured to be supported by the two bearings,
The distance between the two bearings supporting the input shaft 61 can be increased, and the weight of the body of the elastic joint 7 and the output shaft 71 can be increased.
Of the input shaft 61 to bend due to the weight of the input shaft 61
Control can, without cause a trouble in engagement with the sun gear 61a and the planetary gear 63, it is possible to perform engagement of both smooth.

Further, since the rear bearing 10a is disposed inside the internal gear 64, even if the bearing for supporting the input shaft 61 is disposed before and after the sun gear 61a, the total length of the reversing gear device 6 is increased. It is not necessary to reduce the number of front bearings to one, so that the total length L of the reversing gear device 6 can be made shorter than the total length L ₁ of the conventional example (see FIG. 3).

[0021]

As described in detail above, according to the shaft structure of the contra-rotating marine propeller device of the present invention, the following effects and advantages can be obtained. (1) The input shaft of the reversing gear device is supported at two positions on the front side and the rear side of the sun gear disposed on the input shaft ,
The fixing ring that supports the rear bearing is
Arm is fixed to the arm fixed to one end
Therefore, it is possible to increase the distance between the two bearings supporting the input shaft, the deflection becomes possible to suppress decrease of input <br/> force shaft by weight of the weight and the output shaft of the main body of the elastic coupling. ( 2 ) For the reason of the above (1) , the inclination of the input shaft of the transmission gear unit can be suppressed, and deterioration of the tooth contact of the sun gear in the transmission gear unit can be suppressed , thereby meshing the gears in the transmission gear unit. improve the reliability of the transmission gear the probability of accidents due to defective decrease <br/> less able to be with that Do. ( 3 ) The reversing gear device is a star type planetary gear type.
If it was the front bearing of the input shaft of the reversing gear unit to one
What but coupled with, it is possible to shorten the overall length of the reversing gearbox.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main portion of a shaft structure of a contra-rotating marine propeller device according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a shaft structure of a conventional contra-rotating marine propeller device.

FIG. 3 is an enlarged sectional view of a portion A in FIG. 2;

[Explanation of symbols]

1a Output shaft of engine 2 Inner shaft 5 Outer shaft 6 Star type planetary gear reversing gear device 7 Elastic joint 10a Rear bearing 10b Front bearing 11 Fixing ring 61 Input shaft of star type planetary gear reversing gear device 71 Output of elastic joint axis

Claims (1)

(57) [Scope of request for utility model registration] In a marine contra-rotating propeller apparatus, an assembly flange mounted on an output shaft of an engine, an elastic joint mounted on the assembly flange, and a star-type planetary gear type reversing gear having a front end connected to the elastic joint. A hollow outer shaft connected via a device and having a front propeller attached to a rear end thereof, and a front end disposed coaxially with the inside of the outer shaft and having a front end connected to an output shaft of the engine. The input shaft of the star type planetary gear reversing gear device is connected to the output shaft of the elastic joint while having an inner shaft connected to the assembly flange and having a rear propeller attached to the rear end. ,
A sun gear of the star-type planetary gear reversing gear device is disposed on the input shaft, and the input shaft has one outer peripheral portion at each of a front side and a rear side of the sun gear. The rear bearing is supported by a fixed ring and the fixed ring is
A shaft structure of a marine contra-rotating propeller device, wherein one end portion is fixed to an arm fixed to a casing of a star type planetary gear type reversing gear device.