JP2000043793A - Driving device for ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the free rotation of a propeller by piercing a fixed member through a through hole and an insertion hole to regulate the rotation of a rotary shaft. SOLUTION: In this driving device of a ship provided with a steam turbine, a steam generated in a boiler is introduced in a high-pressure turbine and a low-pressure turbine and gives the power by passing through these turbines. When the ship is moored offshore, and the driving device is stopped, a securing bolt 38 is screwed in a bolt hole 4, a tip part of the securing bolt 38 is projected from the bolt hole 34 and inserted in the insertion hole 33. Even when the rotational force is give to the propeller by the tide and the propeller is freely rotated, the projected part of the securing bolt 38 is brought into contact with an inner wall of the insertion hole 33, and the propeller can not be rotated any more. The free rotation of the propeller is thus regulated, and since no additional rotational force is given to the propeller, the drift of the ship can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a ship, and more particularly, to an idle rotation preventing mechanism for preventing idle rotation of a propeller of a ship.

[0002]

2. Description of the Related Art For example, in a ship in which a propeller is rotationally driven by a steam turbine, steam generated in a boiler is guided to a turbine, and blades provided in the turbine receive steam pressure to generate power. ing.

A turbine is provided with a turbine rotating shaft inserted therethrough, and power is transmitted from the turbine rotating shaft to a propeller shaft and a propeller attached to the propeller shaft via various gears and an intermediate shaft. It has become.
Thus, the propeller is driven to rotate to apply a propulsive force to the boat.

Here, the rotation of the propeller and the rotation of the turbine are always directly linked to each other and linked to each other. Therefore, although the required torque is different, the rotational force is changed from both directions on the propeller side and the turbine side. Are provided to each other.

[0005]

Incidentally, in a conventional ship, the propeller sometimes idles when the ship is moored offshore due to, for example, a tide. If such idler occurs in the propeller, the idler generates a propulsive force, and the boat may drift and proceed in an unexpected direction.

Further, when the propeller idles, the turbine, the reduction gear, or the intermediate bearing also rotates with the idle rotation, so that a load is generated on these turbines and the like. For this reason, burnout may occur in various mechanisms such as the turbine, the reduction gear, and the intermediate bearing.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a marine drive device in which a propeller is prevented from rotating freely.

[0008]

According to a first aspect of the present invention, there is provided a marine drive apparatus for driving a propeller to drive a marine vessel by driving the propeller. A rotating shaft having a through hole radially formed at an end thereof, an insertion hole formed so as to be able to communicate with the through hole, and a fixing member attached and fixed to a fixing portion. And a restricting member that restricts the rotation of the rotating shaft by being inserted through the through hole and the insertion hole.

[0009]

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

FIG. 2 shows the configuration of a drive unit 10 in a ship driven by a steam turbine.

[0011] Driving device 1 for ships equipped with a steam turbine
No. 0 has a boiler (not shown) for generating steam to apply steam pressure to the steam turbine. This boiler is connected to a high-pressure turbine 11 and a low-pressure turbine 12, which are steam turbines, respectively.
The low pressure turbine 12 is connected to a condenser (not shown). Thereby, the steam generated in the boiler is introduced into the high-pressure turbine 11 and the low-pressure turbine 12 and passes through the turbines 11 and 12, thereby providing power. In addition, the steam is introduced into the condenser. Then, the steam is cooled and returned to warm water again.

Here, a first high-pressure side small gear 14 is attached to one end of a turbine rotating shaft 13 of the high-pressure turbine 11. The first high-pressure side small gear 14 is a high-pressure turbine-side large gear 1 attached to one end of the intermediate shaft 15.
6 is engaged.

A second high-pressure pinion 17 is mounted on the other end of the intermediate shaft 15 to which the high-pressure turbine-side large gear 16 is mounted.

The second high-pressure side small gear 17 meshes with the propeller-side large gear 18. The propeller-side large gear 18 is attached to one end of a propeller rotating shaft 19, and a propeller 20 is attached to the other end of the propeller rotating shaft 19. Thereby, the driving force of the high pressure turbine 11 is reduced and transmitted to the propeller 20, and even when a small torque is given to the turbine rotating shaft 13, a large torque is applied to the propeller rotating shaft 1.
9 is provided. Conversely, when the driving force is transmitted from the propeller 20 to the high-pressure turbine 11 or the low-pressure turbine 12, a large torque is required.

Similar to the high pressure turbine 11, a similar mechanism is provided on the low pressure turbine 12 side. The power generated in the low-pressure turbine 12 causes the turbine shaft 21
The first low-pressure side small gear 22 attached to the end of the first low-pressure side small gear 22 also rotationally drives the low-pressure turbine-side large gear 23 meshed with the first low-pressure side small gear 22.

The low-pressure turbine-side large gear 23 has an intermediate shaft 24.
The second low-pressure pinion 25 is attached to the other end of the intermediate shaft 24. The second low-pressure side small gear 25 meshes with the propeller-side large gear 18 to enable the power generated by the low-pressure turbine 12 to be transmitted to the propeller-side large gear 18.

Here, the other end of the turbine rotating shaft 21 is
The low-pressure turbine 12 is provided so as to protrude toward the opposite side to the first low-pressure side small gear 22. As shown in FIG.
1a, a bearing 30 is provided to support the turbine rotating shaft 21. In this case, bearing 3
Numeral 0 is attached to a low-pressure turbine rotor shaft retainer 31, and the low-pressure turbine rotor shaft retainer 31 is attached to and fixed to a bearing stand lower casing 32.

A through hole 33 is formed in the lower bearing housing 32 in a vertical direction which is coaxial with the radial direction of the turbine rotating shaft 21. The insertion hole 33 is formed to have a sufficient inner diameter to allow a securing bolt 38 to be described later to pass therethrough. A bolt hole 34 is formed in the turbine rotation shaft 21 so as to be coaxial with the insertion hole 33. The bolt hole 34 penetrates in the radial direction of the turbine rotating shaft 21 and has a thread groove so that a securing bolt 38 described later can be screwed therein.

The low-pressure turbine rotor shaft retainer 3
1 and the bearing stand undercarriage 32 are housed in a casing 35, and the casing 35 is configured to be attached to a fixed portion (not shown).

On the upper surface side of the casing 35, there is formed a notch hole 36 which is opened by being cut out, and the cover body 3 is covered so as to cover the notch hole 36.
7 is attached. The cover body 37 is attached to the casing 35 by, for example, bolts.
A configuration in which one end is supported by a rotating shaft (not shown) and rotated to open and close freely may be used.

With the cover 37 removed, a securing bolt 38 is screwed into the bolt hole 34 from one end. The securing bolt 38 is provided in the bolt hole 34.
Is formed to have a length that can sufficiently protrude from the other end of the bolt hole 34.

When screwing the securing bolt 38, the angle of the turbine rotating shaft 21 is determined in advance so that the tip of the securing bolt 38 is inserted into the insertion hole 33. The securing bolt 38 is screwed.

According to the drive device 10 for a ship having the above configuration, the ship is moored offshore and the drive device 1
When 0 is in the stopped state, the securing bolt 38 is screwed into the bolt hole 34, and the tip portion of the securing bolt 38 is projected from the bolt hole 34 and inserted into the insertion hole 33.

By doing so, even when the propeller 20 is caused to rotate by applying a rotational force to the propeller 20 due to the tidal current, the protruding portion of the securing bolt 38 comes into contact with the inner wall of the insertion hole 33, so that the propeller 20 Can no longer rotate. As a result, the floating of the propeller 20 is restricted.

Therefore, no extra rotational force is applied to the propeller 20, so that drifting of the ship can be prevented.

The high-pressure turbine 11 and the low-pressure turbine 12 are provided so as to be linked with the rotation of the propeller 20 by inserting the securing bolts 38 into the bolt holes 34 and the insertion holes 33. Since idle rotation of the intermediate members such as the turbine rotating shaft 13 and the first high-pressure side small gears 14 and the like can be restricted, burning caused by the idle rotation can be prevented.

Further, since the securing bolt 38 is inserted through the other end of the turbine rotating shaft 21 that penetrates the low-pressure turbine 12, even if a predetermined rotational torque is generated due to idle rotation of the propeller 20, various types of gears can be used. The torque applied to the securing bolt 38 can be reduced by the rotation speed ratio of 14. For this reason, the securing bolt 3 is attached to the propeller rotating shaft 19.
Since the torque applied to the securing bolts 38 is smaller than that in the case where the bolts 8 are inserted, the mechanism for restricting the free rotation of the securing bolts 38 and the bearing base lower compartment 32 and the like should be reduced in size. Can be.

Further, since the securing bolt 38 is screwed into the bolt hole 34, the securing bolt 38
Can be prevented from falling off.

Although the embodiment of the present invention has been described above, the present invention can be variously modified. This is described below.

In the above embodiment, a bolt hole 34 is formed in the turbine rotating shaft 21 through which the low-pressure turbine 12 is inserted.
Although the securing bolt 38 is inserted through the bolt hole 34, a similar mechanism may be provided on the high-pressure turbine 11 side.

In the above embodiment, the high pressure turbine 11 and the low pressure turbine 12 are provided.
The reverse turbine may be provided separately from them, or may be provided coaxially with the low-pressure turbine 12, for example.

In the above embodiment, a ship driven by a steam turbine has been described. However, the present invention is applied to a drive device for a ship provided with another prime mover such as a diesel engine. No problem.

Further, without forming the bolt hole 34, the through hole without any thread groove is formed in the turbine rotating shaft 21.
The propeller 2 is formed by inserting a normal pin-shaped member instead of the securing bolt 38 into this through-hole.
A configuration for preventing idle rotation of 0 may be employed.

In addition, various modifications are possible without departing from the scope of the present invention.

[0035]

As described above, according to the present invention,
By inserting the regulating member so as to communicate with the through hole and the insertion hole, idle rotation of the propeller can be prevented. This makes it possible to prevent drifting of the ship and burnout of the internal combustion engine and various drive components provided on the ship.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a protruding portion on the other end side of a turbine rotating shaft according to an embodiment of the present invention, where (a) is a front view and (b) is a plan view in (a). .

FIG. 2 is a diagram schematically showing a ship drive device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Drive device 11 ... High-pressure turbine 12 ... Low-pressure turbine 19 ... Propeller rotating shaft 20 ... Propeller 21 ... Turbine rotating shaft 30 ... Bearing 31 ... Low-pressure turbine rotor shaft holding 32 ... Bearing base lower vehicle room 33 ... Insertion hole 34 ... Bolt hole 35 ... Casing 38 ... Bolts for securing

Claims (1)

[Claims] 1. A marine drive apparatus for applying a propulsive force to a marine vessel by driving a propeller, the marine drive apparatus being provided so as to interlock with the rotation of the propeller, and having a through hole formed at an end portion penetrating in a radial direction. A shaft, an insertion hole is formed so as to be able to communicate with the through hole, and a fixing member attached and fixed to a fixing portion, and is inserted through the through hole and the insertion hole so as to be inserted into the rotating shaft. And a regulating member that regulates the rotational drive of the marine drive.