JPS62137297A - Watertight rotation transmitting device - Google Patents

Abstract

PURPOSE:To constitute a watertight rotation transmitting device with a first magnet body, mounted on a rotary shaft, a non-magnetic cylindrical watertight shell, with which the magnet of the rotary shaft is covered, and a rotary body having a second magnet body coupled with the first magnet body. CONSTITUTION:In a watertight rotation transmitting device, a first magnet 32 is magnetically coupled with a second magnet 38 through a cylindrical watertight shell 34. With a rotary shaft 30 rotationally driven, the first magnet 32 is also rotated togetherwith, and the second magnet is also rotated, as in a synchronous electric motor, following rotation of the first magnet through magnetic coupling made between the first and second magnets 32 and 38. Since there is no mechanical coupling between the rotary shaft 30 and the rotary both 36 and the two members are completely separated from each other, a completely watertight rotation transmitting device can be constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a watertight rotational transmission device that can provide a completely watertight state between the inside and the outside. This invention relates to a watertight rotation transmission device that can be used very effectively to drive the rotation of propellers for propulsion and attitude control.

Conventional technology Conventionally, underwater rotating members such as propellers for ship propulsion, propulsion and attitude control propellers for submarines, and side thrusters for marine structures have had their rotating shafts watertightly sealed with mechanical seals. It is configured to rotate by being driven by a rotational motion source within the hull.

- As an example of such a mechanical seal, the case of a propeller shaft of a propulsion propeller of a ship is illustrated in FIG. In FIG. 2, reference number 10 indicates a propeller shaft, and although it is not shown in FIG.
A propeller is attached to the left end of the propeller shaft, and the right end of the propeller shaft is connected to a drive source.

In the mechanical seal portion of such a propeller shaft 10, a cylindrical seal material 12 made of synthetic rubber or the like is used.
1 so that it is fixed and rotated together with the propeller shaft 10.
It is being done. A resting surface of the mating ring 16 is in contact with a hull-side end surface 14 of the supporting member 12 that is perpendicular to the central axis of the propeller shaft 10 . The outer periphery of the mating ring 16 is attached to the fixing part 2 of the hull with a screw 18.
A ring 22 is disposed between the outer periphery of the mating ring 16 and the hull fixing part 20 to make the space between the two watertight.

Further, the mating ring 16 is provided with a lubricant supply hole 24 that reaches the hull side end surface 14 of the branch member 12, and a lubricant is supplied to the lubricant supply hole 24 from an appropriate lubricant supply device (not shown). are being supplied. For example, seawater or oil is used as the lubricant.

In the propeller shaft mechanical seal as described above, water pressure acts on the outside of the supporting member 14, and the supporting member 14 is pressed against the mating ring rod.

On the other hand, since the lubricating liquid is supplied under pressure from the lubricating liquid supply hole 24, there is , filled with lubricating fluid against the water pressure described above. In this way, the propeller shaft rotates without any sliding resistance between the support member 12 and the mating ring 16, and watertightness between the support member 12 and the mating ring 16 is also achieved.

In order to efficiently achieve such lubrication and watertightness, it is necessary to flush the sliding surface between the supporting member 12 and the mating ring 16, and for this purpose, highly accurate machining is required. .

Furthermore, in order to supply the lubricant under pressure from the lubricant supply hole 24, a lubricant supply device is required as described above, and the pressure of the lubricant supplied by the supply device also needs to be adjustable. There is. The reason is that water pressure changes with depth. That is, the deeper the water gets, the more the force with which the supporting member is pressed against the mating ring increases.

Therefore, it is necessary to supply lubricating fluid between the support member and the mating ring against this pressure, so the deeper the water becomes, the higher the supply pressure of the lubricating fluid is required. If the lubricant pressure and water pressure are not balanced,
Lubricating fluid may leak into the water, or water may enter the ship.

As described above, the conventional mechanical seal for the propeller rotating shaft has a complicated mechanism and requires an accessory device such as a pressurized lubricant supply device. It is extremely difficult for mechanical seals to maintain complete watertightness when water pressure becomes extremely high. This problem is extremely serious in the case of deep-sea submersibles, and in reality, conventional deep-sea submersibles
There were constant problems with the shaft seal around the propeller shaft.

Problems to be Solved by the Invention Therefore, it is an object of the present invention to provide a watertight rotation transmission device that can be applied as a rotation transmission mechanism such as a propeller shaft and that solves the problems of the conventional mechanical seals described above. It is.

Specifically, the present invention has a simple structure, does not require an accessory device such as a lubricant pressurized supply device, and furthermore,
It is an object of the present invention to provide a watertight rotation transmission device completely free from watertightness problems.

Means for solving the problem, that is, a watertight rotation transmission device according to the present invention, as shown in FIG. magnet 32 and rotating shaft 3
0 and a non-magnetic cylindrical watertight shell 34 that covers the magnet 32 in a coaxial relationship, and around the cylindrical watertight shell 34, a rotating body 36 having a cylindrical inner surface rotates via a bush 36A, for example. Further, a second magnet 38 is attached to the cylindrical inner surface of the cylindrical rotating body 36 so as to be magnetically coupled to the first magnet 32 of the rotating shaft 30 via the cylindrical watertight shell 3.1. will be provided.

Function In the watertight rotation transmission device as described above, the first magnet 32 and the second magnet 38 are magnetically coupled, so when the rotating shaft 30 is driven to rotate, the first magnet 32 also rotates together. , like a synchronous motor, the first magnet 32 and the second magnet 3
8, the second magnet 38 also rotates following the rotation of the first magnet 32.

As a result, the cylindrical inner rotating body 36 rotates. Therefore,
For example, as shown by the dotted line in FIG. 1, by attaching a propeller 38A to the outer peripheral surface of the rotating body 36, the propeller can be rotationally driven.

Then, there is a t between the rotating shaft 30 and the rotating body 36 having the inner cylindrical surface.
! There is no +8 connection, the two are completely separated by the cylindrical watertight shell 34, and the rotating shaft 30 is connected to the cylindrical watertight shell 34.
It is only covered by Therefore, by simply making the water-tight shell 34 completely water-tight, a completely water-tight rotation (publication) device without any fear of water intrusion can be realized.

Embodiments Hereinafter, embodiments of a watertight rotation transmission device according to the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a schematic longitudinal cross-sectional view of a propeller device implementing a watertight rotation transmission device according to the present invention, and FIG. 4 is a cross-sectional view taken along line rV-EV in FIG. 3.

The illustrated propeller device has a non-magnetic cylindrical watertight pressure shell 42 protruding from a watertight pressure shell 40 of the hull, and inside the cylindrical watertight pressure shell 42 is a rotating shaft that is rotationally driven by a motor or the like. 44 are disposed in a coaxial relationship, and an inner ring 50 is similarly secured to the tip by a key 46 and a screw 48 in a coaxial relationship.

As can be clearly seen from FIG. 4, around the inner ring 50, plate-shaped magnets 52 having a thickness that does not contact the inner surface of the cylindrical watertight pressure shell 42 and having a quarter-arc cross section are arranged at equal angular intervals. - The gap is filled with a non-magnetic material 54 such as epoxy resin. The plate magnet 52 is polarized in the thickness direction, and the S pole is located on the outside.
Plate magnets 52 having N poles located on the outside are arranged on both sides of the magnet 2 .

Further, a bushing 55 is attached to the outer edge of the tip of the inner ring 50 to maintain an appropriate distance between the inner ring 50 and the cylindrical watertight pressure shell 42.

Further, from the tip of the cylindrical watertight pressure shell 42, a support shaft 56 is positioned on the central axis of the cylindrical watertight pressure shell 42.
is extending. The outer ring 58 having an inner diameter larger than the outer diameter of the cylindrical watertight pressure shell 42 is connected to the cylindrical watertight pressure shell 42 .
It is mounted coaxially with the Closed end 6 of its outer ring 58
0 is formed with a hole through which the support shaft 56 passes. Furthermore, as can be clearly seen from FIG. 4, on the inner surface of the outer ring 58, plate magnets 62 having a quarter-arc cross section and a thickness that does not contact the outer surface of the cylindrical watertight pressure shell 42 are arranged at equal angular intervals. The gap is filled with a non-magnetic material 64 such as epoxy resin. The plate magnet 62, like the plate magnet 52 of the inner ring 50, is polarized in the thickness direction, and on both sides of the plate magnet 62 with the S pole located inside, there are
A plate-shaped magnet 62 with a north pole located inside is arranged.

The front end surface of the cylindrical watertight pressure shell 42 and the closed end 60 of the outer ring 58
An oil-free bearing member 65 made of Teflon or the like is inserted as a thrust bearing between the inner surface and the inner surface. A bushing 66 is attached to the inner surface of the open end of the outer ring 58 to maintain a constant distance between the cylindrical watertight pressure shell 42 and the outer ring 58.

Further, a propeller 68 is rotatably mounted on the support shaft 56. An oil-free bearing member 70 made of Teflon or the like is similarly inserted as a rotation bearing between the propeller 68 and the through hole of the outer ring closed end 60 and the support shaft 56.

The propeller 68 has a screw 7 attached to its outer ring closed end 60.
It is fixed by 2. - That is, the propeller 68 is configured to rotate together with the outer ring 58 around the support shaft 56.

A cap member 76 is attached to the tip of the support shaft 56 via an oil-free thrust bearing member 74 made of Teflon or the like, and is attached to the support shaft 56 with a pin 78 .

In the watertight rotation transmission device as described above, the magnets 52 and 6
2 is stable in a magnetic pole relationship in which the south pole and the north pole face each other and are attracted to each other, as shown in FIG. In this state, the attractive force between both magnets is the greatest.

In such a state, when the rotary shaft 44 is rotated, the inner ring 50 also rotates, and the magnet 52 disposed on the outer circumferential surface of the inner ring 50 also rotates. Along with this, magnets 52 and 62
The face-to-face relationship between the S and N poles is about to shift, but
Due to the attractive force acting on both magnets 52 and 62, magnet 52
The magnet 62 is also pulled and rotated so as to maintain the facing relationship between the S and N poles between the magnets 62 and 62, and the outer ring 58 rotates. That is, the outer ring 58 rotates in synchronization with the rotation of the inner ring 50, similar to the relationship between the rotating magnetic field and the rotor in a synchronous motor. In addition, the propeller 68 is also rotationally driven by the rotation of the first theory 58.

On the other hand, the drive side, such as the rotating shaft 44 including the inner ring 50, is completely covered by the watertight pressure shell 40 and the cylindrical watertight pressure shell 42, and there is no gap for water to enter. Therefore, there is no need for mechanical seals around the rotating shaft that rotationally drives the propeller 68 (there is no problem with watertight sealing. Therefore, the watertight pressure shell 40 and the cylindrical watertight pressure shell 42 By simply designing the propeller to the required pressure resistance, the shaft seal part will not be flooded with water due to propeller drive at any water depth within the pressure resistance range.

Further, the structure is simple because it does not require an accessory device such as a lubricating fluid supply device like a conventional mechanical seal.

In the above embodiment, in order to increase the magnetic coupling area between the magnets 52 and 62, the magnets are shaped like a curved plate like a quarter of a cylinder, covering almost the entire outer peripheral surface of the inner ring 50. covered throughout. However, the magnet is not limited to the shape of a quarter part of the cylinder, but may also be shaped like a part of another cylindrical part, such as a large part of the cylinder or a part of the cylinder. If the magnets are small, the magnetic coupling area between the magnets 52 and 62 can be increased by increasing the axial length of the magnets.

Effects of the Invention As is clear from the above description of the embodiments, the watertight rotation transmission device according to the present invention has a simple structure, does not require an accessory device such as a lubricant pressurized supply device, and furthermore, does not have the problem of watertightness. completely free from. Therefore, when used as a propeller drive device for propulsion or attitude control of a deep-sea submersible, the problem of water intrusion around the propeller drive shaft, which is an extremely important problem for submersibles, is completely solved. Therefore, the safety of the submersible can be significantly improved.

The watertight rotation transmission device of the present invention can be widely used not only for driving propellers of ships and marine structures, but also for underwater rotation transmission mechanisms such as underwater camera rotation devices and underwater TV left camera rotation devices. It can be used not only underwater, but also in rotation transmission mechanisms that require watertightness or airtightness.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating a watertight rotation transmission device according to the present invention, FIG. 2 is a diagram illustrating an example of a mechanical seal of a propeller drive shaft, and FIG. 3 is a diagram illustrating a propeller implementing a watertight rotation transmission device according to the present invention. FIG. 4 is a cross-sectional view along the line rV-I'V in FIG. 3. [Main reference numbers] 10...Propeller shaft 12...Support material 16...Mating ring 24...Lubricant supply hole 30...Rotating shaft 32.38...Magnet 34...
Cylindrical watertight shell 36...Rotating body 40 with a cylindrical inner surface...Watertight pressure-resistant shell 42...Cylindrical watertight pressure-resistant shell 50
...Inner ring 52.62...Magnet 58...Outer ring
68...Propeller patent applicant Marine Science and Technology Center Sumitomo Heavy Industries, Ltd.

Claims (1)

[Claims] (1) A rotating shaft, a first magnet provided on the rotating shaft and rotating together with the rotating shaft, a non-magnetic cylindrical watertight shell that covers the magnet in a coaxial relationship with the rotating shaft, and a first magnet provided on the rotating shaft and rotating together with the rotating shaft; a rotating body having a cylindrical inner surface rotatably mounted around the rotating body; and a rotating body provided on the cylindrical inner surface of the rotating body so as to be magnetically coupled to the first magnet of the rotating shaft via the cylindrical watertight shell. a second magnet, and the watertight rotation transmission device is configured to rotate the rotating body following rotation of the rotating shaft.