JPH0615838Y2 - Sealing structure for marine counter-rotating propeller device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a bearing portion of an inner and outer propeller shaft of a contra-rotating propeller device applied to a ship.

[0002]

2. Description of the Related Art The construction of a general-purpose propeller device conventionally used in a ship will be described with reference to the drawings.

FIG. 4 is a schematic configuration diagram of a general-purpose propeller device in a conventional ship, and FIG. 5 is an enlarged detailed view of a portion A of FIG.

A propeller shaft 7 is supported in a stern tube 4 provided on the hull 3 via a front bearing 5 and a rear bearing 6, and the boss portion 2 of the propeller 1 is inserted into the propeller shaft end portion. It is attached by the nut 8.

A front bearing 5 for supporting the propeller shaft 7 in the stern tube 4 is provided between the stern tube end portion, which is a fixed portion, and the boss portion 2 of the propeller 1, which is a rotating portion. The lubricating oil that lubricates the rear bearing 6 and the fluid that the propeller 1 operates (mainly seawater) are cut off, and seawater is mixed into the lubricating oil.
A sealing device A is provided to prevent the lubricating oil from leaking into seawater.

FIG. 5 shows a lip type as a typical example of this sealing device.

In the figure, a sealing device A has a housing 9 attached to the hull side and a liner attached to a boss portion 2 of a propeller 1.
10 are attached, and a plurality of sealing members made of a synthetic rubber material or the like, that is, the first, second, and third sealing members 11, 12,
It is equipped with 13 before and after.

Among the seal members, the first seal member 11 facing the seawater side and the second seal member 12 adjacent to the first seal member 11 prevent seawater from entering from the outside and also face the bearing side. The third seal member 13 prevents the lubricating oil of the bearing from leaking to the outside.

The pressure of the lubricating oil in the bearing portion of the third seal member 13 is set to be slightly higher than normal seawater pressure.

Second seal member 12 and third seal member
The oil passage 14 is opened between the oil passage 14 and the housing 13 through the housing 9, and the oil passage 14 is connected to an oil supply tank 15 provided inside the hull, and a lubricating oil supply system 16 for lubricating the seal device A is provided.
Make up.

However, the lubricating oil supply system of this seal device A
In addition to supplying lubricating oil to the seal member, 16 is used for collecting seawater from the second sealing member 12 side or when the lubricating oil leaks from the third sealing member 13 side. Also used.

Next, FIG. 1 is a schematic configuration diagram of a contra-rotating propeller device.

In the figure, the same parts as those in FIG. 4 are designated by the same reference numerals.

The stern tube 4 provided at the stern of the hull 3 supports a tubular outer propeller shaft 18 through an outer rear bearing 17, and the inner propeller shaft 18 is concentric with the inner bearing.
Supports the inner propeller shaft 20 via 19, the outer propeller shaft
Attach the boss 22 of the front propeller 21 to the inner shaft of the shaft 18
A boss portion 24 of a rear propeller 23 is inserted into the shaft end of the inner propeller shaft 20 and attached by a nut 25.

In the above-mentioned counter-rotating propeller device,
For the same purpose as the above-mentioned general-purpose single propeller device, in order to provide a seal device that shuts off the lubricating oil and the seawater of the bearing,
A front seal device B provided between the hull side and the front propeller 21 and a rear seal device C provided between the front propeller 21 and the rear propeller 23 are required.

[0016]

As described above, in the counter-rotating propeller device, two sealing devices, a front sealing device B and a rear sealing device C, are provided, and lubricating oil is supplied to these sealing devices B and C. If each system is provided independently, the device itself becomes complicated.

Particularly, in the rear sealing device C provided between the front propeller 21 and the rear propeller 23, the liner 10 is attached to the boss portion 24 of the rear propeller 23, and the housing 9 is attached to the boss portion 22 of the front propeller 21. Since they are attached to each other and are rotated in reverse to each other, it is difficult to configure a lubricating oil supply system.

Moreover, the lubricating oil supply system for the rear seal device C is extremely important.

The present invention has been made in view of the above points, and relates to a seal structure of a marine counter-rotating propeller device, and in particular, a system for supplying lubricating oil to a rear sealing device where it is difficult to supply lubricating oil. An object of the present invention is to provide a lubricating oil supply structure for a counter-rotating propeller device, which has an improved structure and contributes greatly to the practical application of the counter-rotating propeller device.

[0020]

In order to achieve the above object, the gist of the present invention is that an inner propeller concentrically arranged so as to rotate in a hollow outer propeller shaft in the opposite direction. In a contra-rotating marine propeller device having a shaft, a front propeller is fixed to an outer propeller shaft, and a rear propeller is fixed to an inner propeller shaft. Between the seal members of the front seal device and between the seal members of the rear seal device, an oil passage for supplying lubricating oil is provided in the boss portion of the front propeller. This is a seal structure for a marine counter-rotating propeller device.

[0021]

With respect to the sealing device having a plurality of sealing members respectively provided between the hull and the front propeller and between the front propeller and the rear propeller, the oil passage is provided at the boss portion of the front propeller. Lubricating oil is supplied to lubricate the intermediate seal member, which is difficult to lubricate with seawater or normal bearing lubricating oil.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a partially enlarged view of the sealing device of the present invention.

In the figure, portions common to FIG. 5 and equal portions are designated by the same reference numerals.

In this invention, the hull side and the front propeller
21 and a front sealing device B provided between the front propeller 21 and
The rear seal device C provided between the rear propeller 23 and the rear propeller 23 has the same basic structure and includes a housing 9, a liner 10, and three seal members 11, 12, and 13.

In the front seal device B, the housing 9 is attached to the hull side, the liner 10 is attached to the boss front face 22a of the front propeller 21, and in the rear seal device C, the front propeller is attached.
The housing 9 is attached to the rear surface 22b of the boss portion 21 and the liner 10 is attached to the boss portion 24 of the rear propeller 23.

In the front seal device B, the housing 9 is provided between the second seal member 12 and the third seal member 13.
The oil passage 14 is opened through the oil passage 14 and the oil passage 14 is connected to an oil supply tank 15 provided in the hull to form a lubricating oil supply system 26 for lubricating the front seal device B.

However, in this invention, the front seal device B is used.
From the inside of the liner 10 of the front propeller 21 and penetrates the boss 22 of the front propeller 21 in the axial direction to provide an oil passage 27, and the front end 27a of the oil passage 27 is connected to the first liner 10 of the front seal device B. Open at the midpoint between the second and third seal members 11 and 12, and
27b is opened through the housing 9 of the rear seal device C to an intermediate point between the second and third seal members 12, 13 of the rear seal device C to provide a lubricating oil supply system for the rear seal device C.
28, and the lubricating oil for the front sealing device B is shared with the lubricating oil for the rear sealing device C.

FIG. 3 shows another embodiment in which the number of seal members on the bearing side is increased by one in the seal device, and a total of four seal members are provided.
This is a configuration example in which an oil passage 27 'is additionally provided between the 13 and the fourth seal member 13'.

[0030]

As described above, according to the present invention, an oil passage is provided by penetrating the boss portion of the front propeller from the inside of the liner of the front seal device to the boss portion of the front propeller in the axial direction, and the front end of the oil passage is The liner of the front seal device is opened at an intermediate point between the second and third seal members so as to communicate with the lubricating oil supply system of the front seal device, and the rear end of the oil passage is at the second side of the housing of the rear seal device. , A lubricating oil supply system for the rear sealing device is formed by opening the third sealing member at an intermediate point, the lubricating oil is shared by the front sealing device and the rear sealing device, and both bearings are used for normal bearings even in seawater. The intermediate seal member, which is difficult to lubricate even with the above lubricating oil, is lubricated, so that the lubricity of the sealing device is improved and there is no hindrance in operation. Counter-rotating propeller equipment with In this case, the lubricating oil supply system of the substantial sealing device can be simplified in structure with one system, and the lubricating oil can be sufficiently supplied to the rear sealing device, and the function of the counter rotating propeller device is improved. It is a remarkable technical idea that greatly contributes to

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a contra-rotating propeller device to which the present invention is applied.

FIG. 2 is an enlarged configuration diagram of a main part.

FIG. 3 is an enlarged configuration diagram of a main part showing another embodiment.

FIG. 4 is a schematic configuration diagram of a general-purpose single propeller device.

FIG. 5 is an enlarged configuration diagram of a main part of the same.

[Explanation of sign]

 1 ... Propeller 2 ... Boss part 3 ... Hull 4 ... Stern tube 5 ... Front bearing 6 ... Rear bearing 7 ... Propeller shaft 8 ... Nut 9 ... Housing 10 ... Liner 11, 12, 13 ... Seal member 14 ... Oil passage 15 ... Refueling tank 16 ... Lubricant supply system 17 ... Outer rear bearing 18 ... Outer propeller shaft 19 ... Inner bearing 20 ... Inner propeller shaft 21 ... Front propeller 22 ... Boss 23 ... Rear propeller shaft 24 ... Boss 25 ... Nut 26 ... Front seal device lubrication oil supply system 27 ... Oil passage 28 ... Rear seal device lubrication oil supply system

Claims (1)

[Scope of utility model registration request] A ship with a hollow outer propeller shaft and an inner propeller shaft concentrically arranged to rotate in the opposite direction, with the front propeller fixed to the outer propeller shaft and the rear propeller fixed to the inner propeller shaft. In the contra-rotating propeller device,
A seal device having a plurality of seal members is provided between the hull and the front propeller, and between the front propeller and the rear propeller, and a seal device is provided between the seal members of the front seal device and at the rear.
A seal structure for a marine counter-rotating propeller device, characterized in that an oil passage for supplying lubricating oil is provided between the seal members of the partial seal device at the boss portion of the front propeller.