JPS6015759Y2 - 360° variable propeller axial direction marine propulsion system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a propeller propulsion device for a ship that is capable of changing the axial direction of a propeller in the entire circumferential direction, that is, over 360 degrees around one point.

When a large ship berths or berths, a tugboat pulls the large ship. In order to quickly berth or berth, the tugboat must be able to perform quick maneuvers such as sudden stops, sharp turns, rapid forward and backward movement, and sideways skidding. be done.

For this reason, conventionally, a tugboat has two propeller propulsion devices installed in parallel at the stern of the boat, the propeller shaft 1 of which can rotate over 360 degrees.

Therefore, a tugboat does not need a rudder. For example, if the propeller axis direction is the direction shown by the solid line, the boat will stop even when the propeller is rotating, and if the propeller axis direction is the direction indicated by the dashed line, the boat will retreat in the direction of arrow A, and the boat will move backwards in the direction indicated by the dotted line. If it is the direction indicated by , the ship can be freely maneuvered such as swerving in the direction of arrow B and moving forward.

In order to perform this maneuver delicately and stably, the conversion speed in the axial direction of the propeller must be kept constant, independent of the rotation speed of the propeller itself.

The object of the present invention is to obtain a propeller axial direction conversion type marine propulsion device in which the conversion speed in the propeller axial direction is constant even if the rotational speed of the propeller changes.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic side view of the entire device. 1 is propeller 2
The shaft is pivotally supported by the shaft support body 3.

Another bevel gear 5 meshes with the bevel gear 4 fixed to the propeller shaft 1, and the vertical shaft 6 having the bevel gear 5 is perpendicular to the propeller shaft 1 in a vertical plane, and extends inside the upper cylinder 3a of the shaft support body 3. A shaft 9 of another bevel gear 8 extending upward and having a bevel gear 7 at its upper end and meshing therewith is connected to a driving shaft 11 of a main engine 12 by a connecting rod 10.

13 is a universal joint. A worm wheel 14 is fixed to the upper cylinder 3a, and a worm 15 that engages with the worm wheel is rotated by a hydraulic motor 16.

The hydraulic motor 16 is rotated by a gear train via a hydraulic circuit in an electrohydraulic servomechanism S driven by a shaft 11a that rotates at the same speed as the driving shaft 11.

The servo mechanism S uses a detection signal of the rotational speed of the driving shaft 11 of the main engine 12 as a feedback amount f, and controls the axial direction conversion speed of the propeller shaft 1 to a constant value.

What is shown in FIG. 3 is a circuit diagram of the above-mentioned electro-hydraulic servo mechanism S.

Reference numeral 17 denotes a variable displacement hydraulic pump connected to and driven by a shaft 11a having a constant velocity as the driving shaft 11 of the main engine 12, and a control rod 17a.
The discharge amount changes depending on the position of and the rotation speed of the driving shaft 11,
This pump 17 drives the aforementioned hydraulic motor 16 .

18 is a rotational speed detector that generates an output voltage in proportion to the rotational speed of the driving shaft 11.

18 may use the tachometer of the main engine.

19 is a potentiometer, the output voltage of the detector 18 is applied to both ends of the resistor, and the slider 19a moves in conjunction with the control rod 17a of the variable displacement hydraulic pump 17 mentioned above.

Reference numeral 20 denotes a reference input setting circuit that generates the reference human power e, and also a propeller axial direction operation circuit.

A servo amplifier 21 receives the difference between the reference human power e and the output voltage f of the potentiometer 19 which is proportional to the rotation speed of the hydraulic motor 16, and generates an output current i for operating the directional control valve 22.

A shift cylinder 23 is operated by the control valve 22, and the control rod 17a is shifted in conjunction with the movement of the piston of the cylinder 23.

Reference numeral 24 denotes a constant volume 8-type hydraulic pump that is driven in the same way as the pump 17 and discharges oil to the control valve 22.

The operation of the above-mentioned propulsion device will be explained.

When the reference input setting circuit 20 outputs the reference input voltage e corresponding to the target value of the propeller axial direction conversion speed, the worm device 14.15 is rotated by the hydraulic circuit, and the propeller shaft 1 is rotated around the axis 6. It turns like this.

When the axial conversion speed V of the propeller shaft 1 matches the target value corresponding to the reference input voltage e, the rotation speed detector 1
Suppose that B generates an output voltage f and inputs it to the potentiometer 19, and the control rod 17a of the variable displacement hydraulic pump 17 comes to a certain position.

Here, the position of the slider 19a of the potentiometer 19 is adjusted to make its output voltage f' equal to the reference input voltage e.

In this way, the difference between e and f', that is, the operating signal, becomes zero, the output current of the servo amplifier 21 also becomes zero, and the propeller axial direction conversion speed V becomes a constant equilibrium state.

In this state, if U becomes large, the output voltage of the rotational speed detector 18 increases by Δf, and the output voltage of the potentiometer 19 increases by Δf'.

Therefore, the operating signal voltage becomes Δf', an output current i is generated in the servo amplifier 21, and the directional control valve 22 is operated.
The piston of the shift cylinder 23 moves the control rod 17a in the direction of decreasing the amount of power, and also moves the slider 19a in the direction of decreasing the output voltage.

In this way, the propeller axial direction conversion speed V returns to its original value,
The difference between the output voltage f' of the potentiometer and the reference input voltage e becomes zero again, and the servo system is balanced.

In this state, the control rod 17a is held at the new position, and the directional control valve 22 returns to the neutral position.

If the propeller shaft conversion speed V becomes small, the servo system will be balanced by an action opposite to the above action.

To stop changing the propeller axial direction and maintain the axial direction constant, when the reference input voltage e is set to zero, the control rod 17a
closes the hydraulic pump 17 and the propeller shaft 1 stops rotating.

As a result of the above-described configuration of the present invention, the output voltage f of the rotational speed detector 18 that detects the rotational speed of the driving shaft 11 of the main engine 12 is converted into an output voltage f' by the potentiometer 19, and this output voltage f' and the reference input voltage e is input to the servo amplifier 21, and the amplifier 2 corresponding to this power difference is inputted to the servo amplifier 21.
actuate the shift cylinder 23 with an output current i of 1;
In conjunction with this, the control rod 17 of the variable displacement hydraulic pump 17
Since the output of the pump 17 is controlled by moving the propeller shaft 1, the intended purpose of controlling the axial conversion speed of the propeller shaft 1 to a constant value can be achieved even if the rotation speed of the main engine 12 changes. .

In particular, in this invention, since the detection signal of the rotational speed of the main engine 12 is used as the feedback amount, the configuration is simple without requiring a separate drive source for the control device, and it is possible to achieve low fuel consumption without power loss. Moreover, the tachometer attached to the main engine 12 can be used as it is as a rotational speed detector of the servo mechanism, which has the effect of being implemented at low cost.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the operation of a tugboat having a 360° variable propeller axial direction, Fig. 2 is a schematic side view of an embodiment of the present invention, and Fig. 3 is an electrical diagram showing the main parts of the same. FIG. 3 is a circuit diagram of a hydraulic servo mechanism. In the figure, 1... Propeller shaft, 2... Propeller, 3... Propeller shaft support body, 3a...
... Upper cylinder of the shaft support body, 6 ... Vertical shaft, 11.
...Motive shaft, 12...Main engine, 14...
... Worm wheel, 15 ... Worm, 16 ... Hydraulic motor, 17 ... Variable capacity hydraulic motor, 17a ... Control rod, 18・
...Rotation speed detector, 19...Potentiometer, 19a...Slider, 20...
・Reference input setting circuit, 21... Servo amplifier,
22... Directional control valve, 23... Shift cylinder.

Claims (1)

[Scope of utility model registration request] Variable displacement hydraulic pump 1 driven by main engine 12
In a device in which a hydraulic motor 16 is connected to a hydraulic motor 16 and the shaft support body 3 of the propeller shaft 1 is rotated around a vertical axis by the hydraulic motor 16: a rotation for detecting the rotational speed of the driving shaft 11 of the main engine 12; A speed detector 18 is provided; a potentiometer 19 is provided for applying the output voltage f of the detector 18 to both ends of the resistor, and the control rod 17a of the variable displacement hydraulic pump 17 is connected to the slider 19a of the potentiometer 19. Interlocking: A servo amplifier 21 is provided to input the difference between the output voltage f' of the potentiometer 19 and the reference input voltage e;
A shift cylinder 23 operated by the output current i of the amplifier 21 is provided, and the control rod 17a of the variable displacement hydraulic pump 17 is interlocked with the piston movement of the shift cylinder 23 to control the propeller axial direction. 360
°Variable ship propulsion system.