JPH079759Y2 - Counter-rotating shaft seal device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is intended to seal a lubricating oil sealed between inner and outer shafts of a double-reversed shaft used for ships, etc. The present invention relates to a heavy inversion shaft sealing device.

[Prior Art] FIG. 2 illustrates a propulsion shaft system for a ship as a mechanism including the counter-rotating shaft 1. The counter-rotating shaft 1 is configured such that the inner propeller shaft 3 is coaxially inserted into the hollow outer propeller shaft 2 so as to be mutually reversible. The rotational driving force of the main engine 4 is directly transmitted to the inner propeller shaft 3 and drives the stern side propeller 5. Further, the rotational driving force of the main engine 4 is transmitted from the sun gear 6 provided on the inner propeller shaft 3 to the gear casing 7
Is transmitted to the outer propeller shaft 2 via a planetary gear 8 and an internal gear 9 which are supported by the gears 8 and rotate in a fixed position, and reversely drive the bow side propeller 10. That is, the planetary gear mechanism 11 constitutes a reversing gear.

The weight of the outer propeller shaft 2 is supported by the stern tube bearing 12, and the stern tube 15 is lubricated with the lubricating oil R enclosed between the seal devices 13 and 14 on both the bow and stern sides. There is. On the other hand, the inner propeller shaft 3 has its weight supported by the reversing bearings 16 and 17 at both ends of the bow side and the stern side, and the insides of which the lubricating oil r is sealed between the sealing devices 18 and 19 at both ends thereof, which are reversed to each other.・ The outer propeller shafts 2 and 3 are lubricated. Here, these lubricating oils R and r are
The pressure is maintained at a high level of about 0.2 to 0.3 kg / cm ² , and the following lip seal structure is adopted for the sealing device that seals this high-pressure lubricating oil R, r, especially the sealing device 13 on the bow side. Has been done.

FIG. 3 is a side sectional view of a bow-side sealing device 13 having a conventional lip seal structure, which is provided between the stern tube 15 which is not rotated and the outer propeller shaft 2 which is rotationally driven.
The ring-shaped lip seal 21 attached to the annular seal casing 20 on the end surface of the stern tube 15 is brought into contact with the ring-shaped seal liner 23 attached to the outer propeller shaft 2 via the clamp ring 22, and the lubricating oil R It is pressed against the liner 23 by pressure to seal the lubricating oil R. This lip seal 21 generates heat due to friction with the seal liner 23 that rotates together with the outer propeller shaft 2. Therefore, another lip seal is formed on the back surface of the lip seal 21.
24 is provided and a lubricating oil chamber 25 is formed between the seals 21 and 24. The lubricating oil S is separately supplied from the tank 26 to the lubricating oil chamber 25 to cool the seal 21.

As for the pressure resistance performance of both seals 21 and 24, the seal 21 whose both sides are filled with the lubricating oils R and S has good lubricity and cooling properties, and therefore can withstand a differential pressure of ² kg / cm ² . One side is atmosphere side A
The seal 24 that is exposed to is dry at the sliding portion with the liner 23 and has a large friction coefficient, and therefore can withstand only a differential pressure of 0.5 kg / cm ² . The height of the tank 26 is set so that a pressure of about 0.2 kg / cm ² acts on the lip seal 24, which is added here.
Since it is not strongly pressed against 23 and generates less heat,
The required durability is ensured. Further, since the lubricating oil S in the lubricating oil chamber 25 is heated by the friction heat and the agitating heat of the seals 21 and 24, it is circulated between the tank 26 and the tank 26 and the seal 24 from the ventilation duct. I try to cool it with cold air.

[Problems to be Solved by the Invention] By the way, in the above-described sealing device 13, the lubricating oil chamber 25 is refueled with a non-rotating seal casing on the stern tube 15 side.
Easy to start from 20.

On the other hand, when such a sealing device 13 is adopted between the inner and outer propeller shafts 2 and 3 which are reversed from each other, both the seal casing 20 and the seal liner 23 are rotated, so that the tank 26 There was a problem that the refueling structure of became complicated.

[Means for Solving the Problems] In a double reversal shaft in which an inner shaft and an outer shaft covering the inner shaft are driven to be reversed by a reversing gear, a double reversal shaft is provided between the bow-side end of the outer shaft and the inner shaft. A lubricating oil chamber formed to seal the lubricating oil between the inner and outer shafts on the stern side of the seal ring and a seal ring on the bow side of the seal ring from the bow side end of the outer shaft to the reversing gear. In addition to partitioning the atmospheric chamber formed so as to cover it along the inner axis over the side, an injection means for spraying lubricating oil is provided on the atmospheric side rear surface of the seal ring that partitions the atmospheric chamber in the atmospheric chamber. is there.

[Operation] Lubricating oil is sprayed on the atmosphere side rear surface of the seal ring that separates the lubricating oil chamber and the atmosphere chamber to improve lubrication and cooling of the seal ring, improve its pressure resistance, and ensure the sealing performance with a simple configuration. It was done like this.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 illustrates a propulsion shaft system that employs a counter-rotating shaft 1 having a configuration similar to that of the conventional one, and the same parts are designated by the same reference numerals. Further, the seal device 13 on the bow side between the stern tube 15 and the outer propeller shaft 2 is the same as that of the conventional example.

Here, the feature of the present invention lies in a seal structure for sealing between the inner and outer propeller shafts 2 and 3 which are reversed from each other from the atmosphere side A to seal the lubricating oil r filled between them.

As shown in the drawing, the ring-shaped seal casing 27 attached to the end surface of the outer propeller shaft 2 is brought into contact with the ring-shaped seal liner 29 attached to the inner propeller shaft 3 to form a single seal ring 28. This seal ring 28 is configured to seal the lubricating oil r between the shafts 2 and 3 from the atmosphere side A. The seal ring 28 is interposed between the seal casing 27 and the seal liner 29, which are reversed together with the inner and outer propeller shafts 2 and 3, and generates considerable heat due to friction and is exposed to the atmosphere side A so that the pressure resistance performance is improved. As is relatively vulnerable. Here, in the present invention, the seal ring 28 is provided with an injection means for spraying the lubricating oil T from the atmosphere side A at a considerable pressure. In the present embodiment, since the seal ring 28 is located inside the sealed gear casing 7, the seal ring 28 extends from the outside to the inside of the casing 7 via the rotation axis of the planetary gear 8 fixed at a fixed position. The injection pipe 30 is introduced, and the injection pipe 30 is arranged in close proximity to the rear surface of the seal ring 28 on the atmosphere side. That is, by the seal ring 28, the seal ring 28
Of the lubricating oil chamber formed to seal the lubricating oil r between the inner and outer shafts 2 and 3 on the stern side and the inner side of the seal ring 28 from the end of the outer shaft 2 on the bow side to the reversing gear 11 side. The atmospheric chamber formed by the internal gear 9 is partitioned so as to cover the shaft 3 along the shaft 3, and the injection pipe 30 is inserted into the atmospheric chamber.

Lubricating oil is supplied to this injection pipe 30 at a considerable pressure from a pump (not shown), and is injected to the back surface of the seal ring 28 to increase the pressure on the atmosphere side back surface of the seal ring 28, and to lubricate and cool the seal ring 28. It is supposed to do. With such a configuration, it is possible to secure the same operation as that of forming a conventional lubricating oil chamber on the back surface of the seal ring 28. Therefore, the pressure resistance required for the seal ring 28 can be easily ensured without the need to create a lubricating oil chamber by adding a seal ring or to provide a lubricating oil supply system to the lubricating oil chamber. In particular, in the present embodiment, since the lubricating oil is supplied into the gear casing 7, the lubricating oil supply system used for lubricating the planetary gear mechanism 11 can be used.

Furthermore, when installing a conventional lubrication system for the seal ring, there is a concern that the gear casing 7 may become large in size due to its housing. However, in this embodiment, only the injection pipe 30 is provided in the casing 7. This can be realized, and downsizing of the casing 7 can be achieved. Also, as the lubricating oil supply system, not a conventional independent system but a high performance one for the planetary gear mechanism 11 can be shared, so that cleaner lubricating oil can be supplied to the seal ring 28 and its durability is improved. it can.

[Effects of the Invention] In short, according to the present invention, the following excellent effects are exhibited.

Since the lubricating chamber and the atmospheric chamber are separated by the seal ring and the lubricating oil is sprayed on the atmospheric side rear surface of the seal ring, the required sealing performance can be achieved with a simple structure and the sealing device can be simplified.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a preferred embodiment of the present invention, and FIG.
FIG. 3 is a side sectional view showing an example of a counter-rotating shaft system, and FIG. 3 is an enlarged side view of an essential part showing a conventional example. In the figure, 1 is a counter-rotating shaft, 2 is an outer propeller shaft illustrated as an outer shaft, 3 is an inner propeller shaft illustrated as an inner shaft, 11
Is a planetary gear mechanism exemplified as a reversing gear, 28 is a seal ring, 30 is an injection pipe exemplified as an injection means, A is an atmosphere side, and T is a lubricating oil.

Claims (1)

[Scope of utility model registration request] 1. A double reversal shaft for reciprocally driving an inner shaft and an outer shaft covering the same through a reversing gear, and a seal ring is provided between an end of the outer shaft on the bow side and the inner shaft. Then, a lubricating oil chamber formed to seal the lubricating oil between the inner and outer shafts on the stern side of the seal ring and a bow ring side of the seal ring from the bow side end of the outer shaft to the reversing gear side It is characterized in that it is provided with an injection means for partitioning the air chamber formed so as to cover the air chamber along the axis and for spraying lubricating oil toward the atmosphere side rear surface of the seal ring partitioning the air chamber. Counter-rotating shaft sealing device.