JPH0522480Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is mainly used for SWATH ships (Small Water Ships).
plane area twin hull vessel, small water line area catamaran),
This invention relates to a thruster-type propulsion system that is applied to ships and various types of ships, especially those that require light weight.

(Prior Art) A thruster-type propulsion device is a propulsion device in which a boss portion with propeller blades can be rotated around a vertical axis to change the propulsion direction, and does not require a rudder plate. .

FIG. 3 is a sectional view of the main parts of a conventional thruster type propulsion device.

In the figure, a vertical shaft 1 connected to a prime mover (not shown) is connected to a propeller shaft 3 via a bevel gear system 2.
A propeller blade 4 is attached to the rear end of the propeller shaft 3. The vertical shaft 1 has an upper part supported by a bearing 5, a lower part of the vertical shaft 1 supported by two bearings 6 and 7 across one bevel gear of a bevel gear device 2, and a propeller shaft 3.
has its front and rear parts supported by bearings 8 and 9, and the other bevel gear of the bevel gear device 2 is attached to the propeller shaft 3 between both bearings 8 and 9. The bearings 5, 6, 7, 8 are arranged in a gear case 11,
The bearing 9 is connected to the housing 1 connected to the gear case 11.
0, and a presser plate 12 is attached to its front end.

In the figure, 13 is a duct disposed around the propeller blade 4, and 14 is a pivot shaft that is connected to the gear case 11 and is perpendicular to the hull, allowing the boat to rotate 360°.

Note that a bevel gear device 2 is provided inside the gear case 11.
And lubricating oil for lubricating each bearing is sealed.

In the above configuration, the driving force for propulsion is the vertical axis 1
From there, it is transmitted to the propeller blades 4 via the bevel gear device 2 and propeller shaft 3 to obtain the necessary propulsive force. Here, the thrust due to propulsion is supported by a bearing 9 at the front of the propeller shaft 3, and is transmitted from the holding plate 12 to the housing 1.
It is transmitted to the hull via 0-gear case 11-swivel shaft 14. Therefore, in order to obtain sufficient rigidity against the thrust force caused by this propulsion, the housing 10
This is countered by increasing the thickness of the holding plate 12.

On the other hand, when power is transmitted by the bevel gear device 2, a reaction force is generated. The load is applied to each bearing 5, 6, 7 supporting the vertical shaft 1 and the propeller shaft 3.
It becomes supported at 8 and 9. The power is transmitted directly to the gear case 11 from the bearings 5, 6, 7, and 8, and the power is transmitted from the bearing 9 to the gear case 11 via the holding plate 12 and the housing 10.

Here, the outer shape of the gear case 11 and the housing 10 that is integral with the gear case 11 is streamlined in order to smoothly guide flowing water, and the bearings 8 and 9 inside the gear case 11 and the housing 1
Since the gear case 11 is disposed at 0 and is located far apart, the overall rigidity is reduced, and the load due to the reaction by the bevel gear device 2 is quite large and the direction is not unidirectional, so the amount of distortion in the gear case 11 is reduced. becomes larger, which tends to adversely affect the tooth contact, which is a measure of the transmission capacity of the bevel gear device 2. From this point of view, the gear case 11 is made thicker to ensure the necessary rigidity.

(Problem to be solved by the invention) As described above, the housing 10 and the holding plate 1
Increasing the thickness of the gear case 2 and the gear case 11 results in an increase in the weight of the device. Further, since the gear case 11 houses the bevel gear device 2, an increase in the wall thickness results in an increase in the external dimensions. However, on the other hand, this increases resistance due to flowing water, which poses performance problems, and it is also subject to various design constraints.

The present invention was developed in view of the above points, and the purpose is to provide a highly efficient thruster-type propulsion device that enables a significant weight reduction of the device and has fewer restrictions in terms of gear case design. do.

(Means for Solving the Problem) The gist of the present invention to achieve the above object is a shaft system that transmits the driving force for propulsion from a vertical shaft to a propeller blade via a bevel gear device and a propeller shaft. A plurality of bearings for supporting the vertical shaft and the propeller shaft are disposed in one block, and the block is coupled to a thin-walled gear case having an arbitrary streamlined outline via reinforcing ribs. It is a thruster type propulsion device.

(Function) Since a plurality of bearings supporting the vertical shaft and the propeller shaft that transmit the driving force for propulsion are arranged in one block, this block can prevent The size can be reduced by ensuring the necessary rigidity against various forces. The block and gear case are connected via reinforcing ribs, and since there is little demand for strength on the gear case, the gear case can be made thinner and its outer shape can be shaped into any streamlined shape to smoothly guide flowing water. Therefore,
The weight of the entire device can be reduced and propulsion efficiency can be increased.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of a main part of the thruster type propulsion device of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG.

In the figure, parts common or equivalent to those in FIG. 3 will be described with the same reference numerals.

In FIG. 1, propulsion driving force is transmitted from a vertical shaft 1 to a propeller shaft 3 via a bevel gear device 2. As shown in FIG.

The vertical shaft 1 has its upper part supported by a bearing 5,
The lower part of the vertical shaft 1 is supported by two bearings 6 and 7 with one bevel gear of the bevel gear device 2 in between.
The front and rear parts of the propeller shaft 3 are supported by bearings 8 and 9, and the other bevel gear of the bevel gear device 2 is attached to the front end of the propeller shaft 3. Note that the propeller shaft 3 can be made hollow to the extent that necessary rigidity is not impaired in order to reduce the weight. Furthermore, the propeller blades 4 are flange-coupled to the propeller shaft 3, and the inside of the boss of the propeller blades 4 is hollow, thereby reducing weight.

The bearings 5, 6, 7, 8, 9 are arranged in one block 15. The block 15 is designed to ensure the necessary rigidity against various forces generated when transmitting the propulsion driving force to the propeller blades 4.

Block 15 is connected to gear case 11. This gear case 11 has a streamlined outer shape in order to smoothly guide flowing water, and has a thin wall thickness that has the necessary strength to withstand the force of collision with the water flow.

However, the pot part (vertical part) of block 15
The bending moment due to propeller thrust and the torsional moment due to turning act on the unit, and it also supports the weight of the device itself, so it must have a sufficient cross-sectional area and section modulus for strength, as shown in Figure 2. Shape. Then, it is coupled to the pot portion of the gear case 11 via the reinforcing rib 16 by welding. Further, if necessary, reinforcing ribs 17 are provided perpendicular to the reinforcing ribs 16 for reinforcement. These reinforcing ribs 16,1
7 contributes to increasing the rigidity of the pot portion of the block 15 and also contributes to ensuring the necessary rigidity of the gear case 11.

The housing part of the block 15 and the gear case 11 in which the bearings 8 and 9 that support the propeller shaft 3 are installed
are connected by welding via reinforcing ribs 19, and the inside of gear case 11 functions as a low-pressure pressure vessel by sealing lubricating oil.

In the figure, reference numeral 18 indicates a shaft water sealing device installed between the propeller shaft 3 and the block 15. Prevent spillage.

(Effects of the invention) According to the invention having the above configuration, the following effects are achieved.

(1) Bearings that support the vertical shaft and propeller shaft,
Since it is disposed in one block that provides the necessary rigidity, it is possible to reduce the amount of distortion and downsize, and there is no effect on the tooth contact surface of the bevel gear device. Further, there is no need for a heavy housing that is integral with the gear case and has a streamlined outer shape, as is the case in the past, and weight reduction can be achieved in this respect.

(2) All the loads generated between the bevel gears of the bevel gear system become internal forces, and each load cancels out inside the block, so no load acts on the gear case, the amount of distortion is small, and strength requirements are met. Since the number of parts is small, the gear case can be changed from the conventional cast metal structure to a thin plate structure, and the weight of the gear case can be reduced. Furthermore, since there are fewer restrictions on the design of the gear case, it can have any streamlined external shape that provides high efficiency.

(3) Since the block and gear case are connected via reinforcing ribs, the presence of these reinforcing ribs not only contributes to increasing the rigidity of the block, but also contributes to ensuring the necessary rigidity of the gear case.

(4) When installing the shaft water sealing device on the gear case as in the past, when the gear case is distorted, the relative relationship with the shaft cannot be maintained and the sealing function cannot be ensured. Since the water sealing device is attached to the block, it is not affected by distortion caused by the thin gear case.
Does not affect seal function.

As is clear from the above explanation, the present invention can significantly reduce weight compared to conventional propulsion devices.
Cost reduction becomes possible. In addition, it contributes to increasing propulsion efficiency by reducing weight, and ships,
It is highly effective when applied to SWATH ships, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of the thruster type propulsion device of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1,
FIG. 3 is a sectional view of a main part of a conventional thruster type propulsion device. 1... Vertical shaft, 2... Bevel gear device, 3... Propeller shaft, 4... Propeller blade, 5, 6, 7, 8, 9
... Bearing, 10 ... Housing, 11 ... Gear case, 12 ... Holding plate, 13 ... Duct, 14
... Rotating shaft, 15 ... Block, 16 ... Reinforcement rib, 17 ... Reinforcement rib, 18 ... Shaft water sealing device, 1
9... Reinforcement rib, 20... Blank space.

Claims (1)

[Scope of utility model registration request] In a shaft system that transmits propulsion driving force from a vertical shaft to a propeller blade via a bevel gear device and a propeller shaft, a plurality of bearings supporting the vertical shaft and the propeller shaft are disposed in one block, and A thruster-type propulsion device characterized by a block and a thin-walled gear case with an arbitrary streamlined shape connected via reinforcing ribs.