JPH08282592A - Sealing device of propeller shaft - Google Patents

Abstract

PURPOSE: To provide a sealing device of a propeller shaft which has a high sealing property and a high reliability. CONSTITUTION: In a sealing device of a propeller shaft in which a seal ring 22 inserted to the end face of a seal body 18 which is fixed solidly to the propeller shaft 14, is pressure welded to the friction surface 20 formed on the end face of a seat 16 where the propeller shaft 14 is inserted to the inside, a rubber tube 28 whose end is contacted slidable to the friction surface 20, is installed rigidly on the outer periphery of the seal body 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller shaft sealing device for sealing a propeller shaft and the inside of a ship.

[0002]

2. Description of the Related Art Since a propeller shaft of a ship extends from the inside of the ship to the outside of the ship, some kind of sealing device is required to seal the water transmitted along the outer circumference of the propeller shaft. FIG. 3 is a cross-sectional view of this sealing device.
The stern tube 12 is flanged to the stern tube 12, and the propeller shaft 14 is inserted into the stern tube 12 (since the propeller shaft 14 must rotate freely, a certain gap is provided between the two. Available).

On the other hand, on the inside of the propeller shaft 14
A member called a seat 16 is attached to the stern tube 12 in a state where the propeller shaft 14 is inserted inside, and a member called a seal body 18 is fixedly fitted to the propeller shaft 14 so as to be provided on the respective facing surfaces of the seat 16 and the seal body 18. The friction surface 20 and the seal ring 22 are pressed against each other.

[0004]

In this case, since the seal ring is made of a resin that is not so thick, it may be damaged by contact with foreign matter or the like, and water may leak from there. Further, since the seal body is made of rubber and is normally exposed, ultraviolet rays hit the seal body to accelerate deterioration. The present invention solves this problem by covering the seal body with a cover member having a specific structure.

[0005]

Under the above problems, according to the present invention, a friction surface formed on an end surface of a seat having a propeller shaft inserted therein is inserted into an end surface of a seal body fixedly fitted to the propeller shaft. A sealing device for a propeller shaft, in which a rubber ring having an end slidingly contacting a friction surface is tightly fitted to the outer periphery of a seal body. .

[0006]

By taking the above means, the rubber cylinder serves as a cover member for the seal body and also serves to complement the sealing function of the seal ring.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a sealing device according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. The basic structure of the sealing device is as described above. However, the friction surface 20 formed on the end surface of the sheet 16 made of a copper alloy may be made of another material having high abrasion resistance. The seal body 18 is a perforated cup body made of rubber having a large diameter portion and a small diameter portion, and a resin seal ring 22 that is pressed against the friction surface 20 is inserted into the end portion of the large diameter portion.

Further, a band 24 or the like is wound around the outer circumference of the small diameter portion,
By tightening this, it is tightly fitted to the propeller shaft 14. In this case, the small diameter portion is brought closer to the seat 16 side until the seal body 18 is curved outward, and the seal ring 22 is pressed against the friction surface 20. If the seal ring 22 is of a split type, such as a split ring, it is convenient when replacing it. In addition, a bearing member 26 is inserted between the stern tube 12 and the propeller shaft 14.

With the above construction, even if water permeates the bearing member 26 and reaches the outer circumference of the propeller shaft 14, it is sealed here by the pressure contact between the seal ring 22 and the friction surface 20. Will not enter the ship.

According to the present invention, the rubber cylinder 28 is tightly fitted around the outer periphery of the seal body 18 in a state where the end portion is in sliding contact with the friction surface 20. Here, the tight fit is to stop it so that it does not move even if a slight external force is applied,
Specifically, the outer diameter of the rubber cylinder 28 is set to be slightly smaller than the outer circumference of the seal body 18, and the rubber cylinder 28 is tightened by its elastic tightening force, or is tightened by using an appropriate fastener (not shown). . However, since the rubber cylinder 28 also needs to be replaced, fixing with an adhesive or the like would not be preferable.
When the end surface of the rubber tube 28 is worn due to use, the rubber tube 28 may be displaced toward the seat 16 side again.
Can be contacted with.

By the way, the sealing device is provided with an emergency sealing mechanism which is activated when the sealing body 18 is broken. Specifically, a groove is formed on the inner circumference of the seat 16, a rubber ring 30 is fitted in the groove, and a push screw 32 is provided in communication with the groove. Then, the outer periphery of the ring 30 in the groove is filled with incompressible fluid such as grease or highly viscous oil, and the push screw 32 is pushed in to reduce the diameter of the ring 30 and seal the propeller shaft 14. It was done like this. In addition, the sheet 16 is also provided with a water injection nipple 34 capable of supplying lubricating water.

[0012]

Since the present invention is as described above, the following effects can be expected. 1) The rubber cylinder serves as a cover member for the seal body, and prevents the seal body from being deteriorated by being exposed to ultraviolet rays. If the seal body deteriorates, it may break, which may lead to a flood accident. Further, it also serves as a cover for preventing foreign matter or the like from hitting the seal body from the outside and breaking it. 2) Even if the seal ring is damaged for some reason, or the centrifugal force shifts the position to the friction surface and changes the parallelism, which deteriorates the sealing performance, the rubber tube is in sliding contact with the friction surface. , Prevent water from leaking out. In other words,
It provides a double seal structure. 3) Since the rubber cylinder clamps the outer circumference of the seal body, it functions to increase the pressure contact force to the friction surface of the seal ring provided on the end surface of the seal body and to improve the sealing performance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a propeller shaft seal device showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a conventional propeller shaft seal device.

[Explanation of symbols]

 14 Propeller shaft 16 Seat 18 Seal body 20 Friction surface 22 Seal ring 28 Rubber tube

Claims (3)

[Claims] 1. A propeller shaft sealing device in which a seal ring inserted into an end surface of a seal body fixedly fitted to the propeller shaft is brought into pressure contact with a friction surface formed on an end surface of a seat having the propeller shaft inserted therein. A sealing device for a propeller shaft, wherein a rubber cylinder whose end portion is in sliding contact with a friction surface is tightly fitted to the outer periphery of the seal body. 2. The propeller shaft sealing device according to claim 1, wherein a rubber cylinder is tightly fitted to the outer periphery of the seal body by its elastic contraction force. 3. The propeller shaft sealing device according to claim 1, wherein a rubber cylinder is tightly fitted to the outer periphery of the seal body by using a suitable fastener.