JP2858193B2 - 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, and more particularly, to a contra-rotating propeller device employing a hydrodynamic bearing or a hydrostatic bearing for an inner shaft bearing.

[0002]

2. Description of the Related Art When a hydrodynamic bearing or a hydrostatic bearing is used as an inner shaft bearing of a contra-rotating propeller device, it is necessary to supply oil to the bearing by some method. Unlike the conventional single-shaft propeller device, the outer shaft rotates opposite to the inner shaft, and the outer shaft is usually thinner. Pass through. Oil is supplied to the inner shaft bearing directly from the oil supply passage of the inner shaft via oil supply holes arranged radially.

[0003]

However, in the above-mentioned method, even if the orifice position of the oil supply hole is devised, the oil supply directly hits the metal portion of the inner shaft bearing as a jet flow, so that the erosion occurs. This causes problems such as generation and progress. As described above, in the method in which oil is directly supplied from the inner shaft to the metal part of the inner shaft bearing, it is not possible to escape from the risk of erosion and progress of the metal part of the inner shaft bearing. An object of the present invention is to provide a contra-rotating propeller device having a new refueling system that does not have such a risk.

[0004]

The contra-rotating propeller device according to the present invention, which can achieve the above object, has a front propeller connected to one propeller.
Reverse the rear propeller inside the cylindrical outer shaft that rotates in the
Distribution of inner shaft having a lubricating oil supply passage is rotated in a direction
And an inner shaft having a bearing metal on the inner surface of the outer shaft.
In a contra-rotating propeller device having a fixed receiver, the outer shaft
On both the lubricating oil supply path and the inner shaft bearing
Fixing the refueling repeater that communicates with the
Supply lubricating oil to the inner shaft bearing of the outer shaft from the lubricating oil supply passage of the shaft
It has become so.

[0005] As described above, the lubricating oil supply is provided on the inner peripheral surface of the outer shaft.
Fix the lubricating repeater communicating with both the supply path and the inner shaft bearing
As a result, the lubricating oil supply
Lubricating oil can be supplied to the inner shaft bearing of the outer shaft.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 4 denotes a cylindrical outer shaft having a front propeller 2, and the outer shaft 4 is rotatably mounted on a stern hull 10 via an outer shaft stern tube bearing 5. This outer shaft 4
Inside, an inner shaft 3 having a rear propeller 1 is arranged so as to rotate in a direction opposite to the rotation direction of the outer shaft 4. further,
A stern-side inner shaft bearing 7 and a bow-side inner shaft bearing 8 are mounted on the inner peripheral surface of the outer shaft 4.

As shown in FIGS. 2 and 3, the outer shaft 4 has
Multiple (six in the case shown) corresponding to the stern side inner shaft bearing 7
The bearing portion oil supply passage 14 is disposed. The bearing oil supply passage 14
Is a pipe 14a disposed in the longitudinal direction of the outer shaft 4, and a branch path 14b reaching the back of the bearing metal 13 from the pipe 14a.
And a communication path 14c that communicates with a refueling communication path 11c of the refueling communication device 11 described later.

On the other hand, an oil supply passage 9 is provided in the inner shaft 3. The oil supply passage 9 is formed of a main oil supply passage 9a disposed on the axis of the inner shaft 3 and a plurality (four in the illustrated case) of branch passages 9c radially branched from the main oil supply passage 9a. The refueling communication device 11 has an annular shape, and its outer peripheral surface is fixed to the inner peripheral surface of the outer shaft 4.

As shown in FIGS. 4 and 5, a groove 11a is formed on the inner peripheral surface of the refueling communication device 11 along the inner peripheral surface thereof.
The branch pipe 9c of the oil supply passage 9 arranged on the inner shaft 3 communicates with the groove 11a. Furthermore, this groove 11a
The oil supply communication passage 11c radially arranged from the outside communicates with the communication passage 14c of the bearing oil supply passage 14a provided on the outer shaft 4. Further, the oil supply communication device 11 is provided with a return oil passage 15. Further, seals 16 are arranged on both sides of the groove 11a. In addition,
The bow-side inner shaft bearing 8 has the same structure as the stern-side inner shaft bearing 7 except that it does not have the return oil passage 15, and a description thereof will be omitted.

In FIG. 1, reference numeral 12 denotes an annular groove 12a.
And a refueling discharge device having a discharge hole 12c communicating with the groove 12a. A hole 17 provided on the outer shaft 4 communicates with the groove 12a. A shaft seal 6 is provided between the outer shaft 4 and the stern hull 10 and between the inner shaft 3 and the front propeller.

Next, lubrication to the inner shaft bearing will be described. The oil O supplied to the main oil supply passage of the inner shaft 3 passes through the branch passage 9c of the oil supply passage and the oil supply communication passage 11c of the oil supply communication device 11, and reaches the bearing oil supply passage 14 of the outer shaft 4. Then
The oil O is supplied from the branch pipe 14 b of the bearing oil supply passage 14 to the back surface of the bearing metal 13. Therefore, since the oil O does not hit the bearing metal 13 as a jet, the danger of erosion is eliminated. The oil O leaked from the bearing metal 13 passes between the inner shaft 3 and the outer shaft 4 and is discharged from the oil discharge device 12 to the outside of the shaft device. In the above description, the case in which the bearing oil supply passage 14 is provided in the outer shaft 4 has been described. However, as shown in FIG.

[0012]

As described above, according to the present invention, the inner circumference of the outer shaft is
The lubricating oil supply passage and the inner shaft bearing
Since the relay is fixed, the lubricating oil on the inner shaft can be
Lubricating oil can be supplied to the inner shaft bearing of the outer shaft from the supply path.
Twin-shaft reversing propeller device with a lubricating oil supply passage on the inner shaft
Even with conventional lubricating oil, the bearing metal
Is no longer at risk of erosion. So
As a result, the maintenance interval can be lengthened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a contra-rotating propeller device according to the present invention.

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

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is an enlarged view of a main part of FIG. 2;

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a cross-sectional view illustrating another embodiment of the bearing oil supply passage.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rear propeller 2 Front propeller 3 Inner shaft 4 Outer shaft 7, 8 Inner shaft bearing 9 Oil supply path 11 Oil supply communication device 11c Oil supply communication path 13 Bearing metal 14 Bearing oil supply path

Claims (1)

(57) [Claims] 1. When a rear propeller is rotated in a reverse direction inside a cylindrical outer shaft for rotating a front propeller in one direction.
Both have an inner shaft with a lubricating oil supply path ,
In a contra-rotating propeller device in which an inner shaft bearing having a bearing metal is fixed on a peripheral surface, the lubricating oil is applied to an inner peripheral surface of the outer shaft.
Oil supply repeater communicating with both the lubricating oil supply path and the inner shaft bearing
Is fixed, and the lubricating oil supply passage of the inner shaft is
A contra- rotating propeller device that supplies lubricating oil to the inner shaft bearing of the outer shaft .