JPH0741678Y2 - Pod propeller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pod propeller that is a propulsion device of a ship, and more particularly to a pod propeller equipped with an electric feedback device having an actual wing angle.

[Conventional technology]

Recently, a pod propeller has been used as a propulsion device for ships. In contrast to the conventional line shaft type shown in FIG. 4 (a), the pod propeller can move the propeller 4 in the direction of the water flow as shown in FIG. 4 (b), so that vibration and cavitation can be improved and engine M Can be said to have one potential as a propulsion system for high-speed boats or high-speed boats. On the other hand, the pod propeller 1 has a problem that the propulsion performance is deteriorated due to the existence of the fluid resistance of the pod 3 and the struts 2 supporting the pod propeller 1, especially in a high-speed ship, and technical measures are required to minimize it. In the figure, H indicates a hull.

In general, the outer diameter of the pod, in particular, is determined by the equipment built into the pod. When incorporating a propeller drive motor, it is considered to use a superconducting motor in order to reduce the size, but a normal pod propeller is equipped with a drive prime mover inside the ship and has a bevel gear for power transmission. To use. In other words, in a conventionally known swivel thruster that is a type of pod propeller for low-speed ships, the transmission torque of the input shaft that has passed through the struts is bent at a right angle by the bevel gear in the pod, and the propeller is driven. There is (for example, JP-A-58-161689, JP-A-52-15085,
(See JP-A-50-20493). It can be said that the technical progress of the bevel gears gave rise to the pod propeller, but in the case of the above-mentioned conventional technique, the bevel gear in the pod becomes a problem.

As an idea for reducing the diameter of the bevel gear, two propellers are mechanically used, and mechanically, two gears are engaged with a pinion integrally or integrally attached to the input shaft, and two gears are provided for each gear. If a so-called double inversion propeller is used to drive the propeller, a double inversion propeller can be realized more easily than in the case of a normal line shaft system (for example, see JP-A-51-122298). in this case,
The efficiency of the propeller itself is improved and the transmission horsepower is halved, so that the outer diameter of the gear and hence the pod can be reduced.

By the way, the double reversing propeller can improve the efficiency of the propulsion device as described above, but since it is usually a fixed pitch propeller with a constant pitch, the load sharing between the two propellers is unbalanced, and the design and the operation are not necessary. There are various problems associated with fixed pitch propellers such as pitch inadequacy, low power operation, reverse operation, etc. The variable pitch propeller can solve these problems, but it is structurally difficult to replace the two propellers with the variable pitch propeller. That is, generally, in a variable pitch propeller, the pressure oil is sent to the servo motor in the rotary shaft system. It is necessary to extract the actual blade angle signal from the rotating shaft system, but it is not always easy to place these in the narrow pods where compactification is required for the above-mentioned two propellers at the same time. . In the conventional mechanical type blade angle feedback device as in the side thruster which is one of the pod propellers shown in FIG. 5, many link mechanisms L are adopted as shown in the drawing (in addition to this, for example, the above-mentioned JP-A-58-161689). No., JP-A-50-20493),
Because of its unique space, it is difficult to realize a variable pitch propeller in a pod propeller with a double inversion propeller.

The object of the present invention is not to arrange the propellers in a tandem type in which two propellers are arranged in series like a normal double-inverted propeller, but a split type in which two propellers are arranged at the front and rear ends of a pod. The object of the present invention is to eliminate the above, and to electrically extract the actual blade angle signal from the rotating shaft system to preferably configure the two propellers into a variable pitch propeller.

[Means for Solving the Problems]

To achieve the above object, in the pod propeller according to the present invention, two pinion bevel gears are meshed with one pinion bevel gear provided at the input shaft end, and each gear bevel gear is provided at right angles to the input shaft. In a pod propeller equipped with a screw propeller at a position where the propeller shaft penetrates the pod, one or both of the propellers mounted before and after the longitudinal direction of the pod is configured as a variable pitch propeller to support and drive the blades of the propeller. Equipped with an electric blade angle transmitter that converts the mechanical displacement of the actual blade angle into an electric signal in the propeller hub that displaces or in the adjacent propeller shaft,
A rotary joint comprising an electromagnetic induction coil for transmitting an electric signal of the blade angle by electromagnetic induction in a non-contact manner is provided in the propeller shaft, and a tube supported via a bearing is provided at a shaft center portion of the input shaft, A conductor for transmitting the blade angle signal to the inside of the vessel is introduced into the tube to transmit the actual blade angle to the inside of the vessel to contribute to display of the actual blade angle and control of the blade angle.

[Action]

In the above configuration, the mechanical displacement of the actual blade angle is converted into an electric signal by the electric blade angle transmitter, and the electric (blade angle) signal is transferred to the electric power or the electric wave by the electromagnetic induction action of the electromagnetic induction coil. The actual wing angle is fed back into the ship. In other words, by replacing the mechanical actual blade angle feedback device of the variable pitch propeller, which requires a considerable amount of conventional space, with an electric type, and reducing the required space, the double inversion with a more complicated structure is achieved. Easy installation of a variable pitch propeller to a pod propeller with a propeller.

At this time, the reliability with respect to an electric device that is deeply incorporated inside the mechanical structure and has poor accessibility is maintained by eliminating the contact sliding portion and preventing the mechanical external force from acting on the conducting wire (lead wire).

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cut side view of a pod propeller 1 according to the present invention.

In the figure, the external configuration of the pod propeller 1 is the hull H
A strut 2 fixedly attached to the strut 2, a pod 3 provided at the lower end of the strut 2, a propeller hub 5 symmetrically connected to a propeller shaft 8 at both ends of the pod 3, and a projection provided on the propeller hub 5. And a propeller blade 4 that engages with the generated fluid to generate thrust. The strut 2 may be fixed to the hull H as shown in the figure, or may be supported by the hull via bearings such as a swivel thruster so that the strut 2 can swivel.

The strut 2 supports the pod 3 from the hull H, and also includes a drive input shaft 14, a pressure oil pipe 19 for inflection, and a circulating oil pipe for each device in the pot 3 (not shown). The strut 2 needs to be thin as much as possible in order to reduce the fluid resistance.

The pot 3 contains a series of devices for supporting and driving the propeller 4. In order to reduce the fluid resistance of the pod 3, it is necessary to press the outer diameter particularly small. Inside the propeller hub 5, a crosshead 6 that engages with each propeller blade 4
Is provided, and the pitch angle of the propeller can be changed by changing the reciprocating motion into the rotary motion of the propeller blades 4. A servo piston 7 is connected to the crosshead 6, and a pressure oil pipe line 19A formed in a propeller shaft 8 communicates with oil chambers 5A and 5B defined by the piston 7 in the propeller hub 5. . The pressure oil pipe 19A is a rotary joint which is fitted with the propeller shaft 8 with a minimum clearance and is a pressure oil introduction ring.
A pressure oil pipe 19 is connected via 12 (which itself does not rotate). Then, pressure oil controlled via a pressure oil pump and a control valve (not shown) provided in the hull H is sent from the pressure oil pipe 19 to the oil chambers 5A to 5B via the pressure oil pipe line 19A.

Reference numeral 9 is a shaft sealing device that prevents intrusion of seawater into the pod 3 and prevents oil and the like from flowing out of the pod 3. Reference numeral 10 denotes a bearing, which rotatably supports the propeller shaft 8 and transmits its reaction force to the pod 3.

On the other hand, gear bevel gears 11 are integrally or integrally fixed to the inner ends of the left and right propeller shafts 8, respectively, and one pinion bevel gear 13 meshes with these two gear bevel gears 11. A hollow input shaft 14 is integrally or integrally connected to the pinion bevel gear 13 and extends through the strut 2 into the hull H. Therefore, the pinion bevel gear 13 is capable of approximately 100% power transmission with a size that approximately half the power is transmitted.
The upper end of the input shaft 14 has upper gear trains 16 and 17. Usually, the output shaft of the main engine (not shown) is often arranged horizontally, and thus such a Z drive type is often used. 18 indicates an upper input shaft connected to the main engine.

The input shaft 14 has its upper and lower ends supported by bearings 15 and transmits a reaction force to the struts 2. In this case the lower bearing
In the case of 15, the propellers 4 are symmetrically arranged, and the reaction force perpendicular to the axis is structurally balanced, so the load capacity may be small.
Bevel gear 1 without bending because the bending stress of the input shaft 14 does not work
The tooth contact with 1 and 13 is also more advantageous than the normal one.

With the above configuration, a split double-inverted propeller without the double shaft is formed.

In the present invention, at least one of the two propellers is configured as a variable pitch propeller, and the actual blade angle of the propeller is converted into an electric signal and sent to the ship.

That is, in the propeller shaft 8, the servo motor piston 7
Electric Blade Angle Transmitter 20 for Converting the Displacement of a Car into an Electric Signal
Is provided. That is, since the displacement of the servo motor piston 7 has a one-to-one correspondence with the actual blade angle, this displacement is to be converted into an electric signal by a linear synchro, a linear potentiometer, or the like.

An electric signal of the blade angle (also referred to as a blade angle signal) is guided by a conductor 24 into the ship via an electromagnetic induction type non-contact rotary joint 21, a conductor supporting device 22 and the like, which will be described later.

FIG. 2 shows the details of the electromagnetic induction type non-contact rotary joint 21.

The lead wire 24 from the electric wing angle transmitter 20 is a propeller shaft 8
It passes through the inside and is housed in a recess 21j in a coil shape, and its tip is connected to the connector C. The conductor 24 is guided from the connector C to the secondary coil 21a through the passage 21f through the groove 21i between the housing 21g and the propeller shaft 8. The connector C is preferably of the plug type so that all the conductors 24 can be attached and detached at once.

The housing 21g is for convenience of assembly and disassembly. That is, when the connector 21 is connected to the housing 21g outside the propeller shaft 8 and the propeller shaft 8 is assembled, the conductor wire 24 is housed in the recess 21j in a coil shape.

A thermoplastic injection port 21e and an air vent hole having the same structure (not shown) as the injection port 21e are provided to prevent damage to the conducting wire 24 housed in the coil. That is,
When thermoplastic is injected from the injection port 21e, when the plastic returns to room temperature, the conductive wire 24 in the recess 21j is fixed, and even if the propeller shaft 8 rotates, the conductive wire 24 is displaced by its own weight or centrifugal force, No rubbing or force, damage is prevented. At the time of division, if the plastic propeller shaft 8 is warmed from the outside, the plasticity of the plastic is restored and the plastic can be easily decomposed. At that time, lead wire 24
It is necessary to use an insulating material that can maintain stability at the temperature at which plasticity of plastic is restored.

The above-mentioned secondary coil 21a is loosely fitted on the outer peripheral side of the hollow cylindrical primary coil 21b. The secondary coil 21a is integrally attached to the propeller shaft 8 and rotates together with the propeller shaft 8. Actually, it is attached to the propeller shaft 8 via the housing 21g for convenience of assembly and disassembly.
The inner diameter is a hollow cylindrical shape with the propeller shaft 8 and the shaft center being the same,
The blade angle signal is transmitted by electromagnetically engaging with the primary coil 21b.

A hollow shaft 21c is integrally fitted to the primary coil 21b, both ends thereof are supported by bearings 21d, and the axial center of the primary coil 21b is held at the axial center of the propeller shaft 8. Therefore, this hollow shaft
Even if the propeller shaft 8 rotates, 21c is stationary by the rotation stop 23. An inlet 21h for a conductor wire 24 extending from the primary coil 21b is opened on the peripheral surface of the hollow shaft 21c, and the conductor wire 24 is connected to a connector C provided at the end of the shaft. The connector C is preferably of the plug type so that all the conductors 24 can be attached and detached at once.

Although not shown in the figure, in the case where the output of the normal electric blade angle transmitter 20 is taken out as it is, a large error occurs due to changes in temperature and humidity or changes over time. It is often practiced to convert twenty, for example voltage, once into a frequency and carry out signaling in the form of this frequency. In this case, the electromagnetic induction coils 21a, 2
1b is provided with a double function of first supplying electric power to a frequency converter or the like provided in the rotary shaft and further extracting a signal in the form of the output frequency in the form of FM or the like. Will be. However, both the transfer of electric power and the transfer of radio waves are included in the concept of electromagnetic induction, and the electromagnetic induction type non-contact rotary joint 21 includes the case having such a function.

FIG. 3 shows a lead wire support device 22 provided at the upper and lower ends of the input shaft 14.

A tube 22a is provided inside the hollow input shaft 14, and both upper and lower ends thereof are supported by bearings 15. The lower end of the tube 22a is provided with a connector C similar to that described above, and the conductor 24 is guided inside the tube 22a to the upper conductor support device 22 to protect the conductor 24 from external mechanical force. ing.

Reference numeral 22b represents a plug, and if necessary, thermoplastic resin is injected into the tube 22a from here as in the above case.
In this case, the air vent hole is additionally required as in the above case. However, since the tube 22a is stationary by the rotation stop 23 even if the input side 14 rotates, the necessity thereof is small.

The rotation stopper 23 provided for preventing the rotation of the hollow shaft 21c and the tube 22a has its opposite end fixed to the pod 3 or the hull H, but both of them serve only to support the friction of the bearings 21d and 15. , It is designed to be so strong that it does not generate bearing reaction force.

[Effect of device]

As described above, according to the present invention, the actual blade angle feedback is performed by an electric signal to reduce the required space of the device, and it is possible to incorporate the variable pitch propeller into the pod propeller having a plurality of structures. become. As a result, a highly efficient pod propeller can efficiently cover the entire operating range of the ship. Also, 360 °
Even if it is not possible to turn to an arbitrary angle, if it can turn about ± 35 °, for example, the rudder becomes unnecessary, and a propulsion system that exceeds conventional line shaft type propulsion devices can be realized.

Further, since the actual blade angle is converted into electric data and transmitted, the blade angle control accuracy can be improved as compared with the conventional mechanical feedback.

By incorporating a non-contact type rotary joint that uses electromagnetic induction into the propeller shaft, the contact sliding part is eliminated, and mechanical external force does not act on the lead wire to improve the reliability of electrical equipment.

[Brief description of drawings]

1 to 3 are explanatory views of an embodiment according to the present invention, and FIG. 1 is a partially cut side view of a pod propeller of the present invention,
FIG. 2 is a detailed view of the electromagnetic induction type non-contact rotary joint portion, and FIG. 3 is a detailed view of the lead wire supporting device. 4 (a) and 4 (b) are schematic layout comparison diagrams of a conventional line shaft propeller and a pod propeller, and FIG. 5 is an explanatory diagram of a conventional mechanical actual blade angle feedback device. 1 ... pod propeller, 2 ... struts, 3 ... pod, 4 ... propeller (wing), 8 ... propeller shaft, 11 ...
Gear bevel gear, 13 …… Pinion bevel gear, 14 …… Input shaft, 20
...... Electric blade angle transmitter, 21 ...... Electromagnetic induction type non-contact rotary joint (electromagnetic induction coil), 22 ...... Conductor support device, 22a ......
Tube, 24 ... Conductor, C ... Connector.

Claims (1)

[Scope of utility model registration request] 1. A pinion bevel gear provided at an end of an input shaft is meshed with two gear bevel gears, and a propeller shaft provided at a right angle to the input shaft in each of the gear bevel gears penetrates the pod. In a pod propeller equipped with a screw propeller, (a) one or both of the propellers installed in the longitudinal direction of the pod are configured as variable pitch propellers, and (b) a propeller that supports and drives the blades of the propeller. An electric blade angle transmitter for converting a mechanical displacement of an actual blade angle into an electric signal is provided in a hub or an adjacent propeller shaft, and (c) the blade is contactlessly electromagnetically guided in the propeller shaft. A rotary joint composed of an electromagnetic induction coil for transmitting an electric signal of an angle is provided, and (d) a tube supported via a bearing is provided at the axial center of the input shaft, and the tube is provided in the tube. A pod propeller characterized in that a conductor for transmitting the blade angle signal is guided to transmit the actual blade angle to the inside of the ship to contribute to display of the actual blade angle and control of the blade angle.