JP2001138985A - Blade angle holding device for marine vessel propulsion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the angle of propeller blades even with an oil leakage in a hydraulic system of a blade angle changing device in a turning type marine vessel propulsion device. SOLUTION: The marine vessel propulsion device has a turning cylinder 1, a vertical driving shaft 2, a propeller shaft 3, propeller blades 6, a cylinder 14 and a piston 15 for setting the angle of the propeller blades 6, pipelines 9, 10 for supplying the cylinder 14 with oil pressure, and a cross head 17 for converting the linear motion of the piston 15 into rotation for setting the angle of the blades 6. The pipelines 9, 10 are connected to a pump 7 on the marine vessel side through a solenoid valve 8. Oil feeding cylinders 11, 12 serving as oil delivery mechanism from a fixed part to a rotating part are provided at the intermediate parts of the pipelines 9, 10. Inside the turning cylinder 1, a pilot check valve 20 is provided at the pipeline between the oil feeding cylinder 12 and the cylinder 14. Even when hydraulic oil is not fed due to an oil leakage from the seal part or the like of the oil feeding cylinder, pressure in the cylinder is maintained to hold the position of the piston by the check valve function of the pilot check valve 20, so that the angle of the propeller blades 6 can be held without fluctuating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for maintaining a set variable pitch propeller blade angle in a turning type marine propulsion apparatus in which a turning cylinder provided on a ship is provided with a variable pitch propeller. is there.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional marine vessel propulsion device having a blade angle variable device. A turning cylinder 1 is provided at the bottom of the ship so as to be able to turn in a horizontal plane. A vertical drive shaft 2 is provided at the center of rotation of the swivel cylinder 1, and a horizontal propulsion shaft 3 interlocked with the vertical drive shaft 2 is provided. The vertical drive shaft 2 is operatively connected to a motor drive shaft 4 in the ship. A propeller blade 6 is connected to an end of the propulsion shaft 3 via a blade flange 5 and rotates underwater.

[0003] The ship propulsion device is provided with a blade angle changing device for arbitrarily setting the angle of the propeller blade 6. A pump 7 serving as a hydraulic pressure source is provided in the ship. The hydraulic pressure from the pump 7 is guided into the swivel cylinder 1 via hydraulic pipes 9 and 10 as a hydraulic supply system via an electromagnetic valve 8, and an oil supply cylinder 11 as an oil transfer mechanism from a fixed portion to a rotating portion. It is connected to an actuator 13 for changing the angle of the propeller blade 6 via 12.

The actuator 13 has a cylinder 14 fixed to the revolving cylinder 1 and a piston 15 provided in the cylinder 14 and moving directly in the direction of the propulsion axis. The variable shaft 16 is provided on the piston 15, and the variable shaft 16 outside the cylinder 14 is provided with a motion conversion mechanism for converting the linear motion of the piston 15 into a rotational motion for setting the angle of the propeller blade 6. . The motion conversion mechanism has a crosshead 17 connected to the inflection shaft 16 and the blade collar 5 that rotates in conjunction with the linear motion of the crosshead 17. A propeller blade 6 is connected to the blade flange 5.

[0005] Hydraulic pipes 9 and 10 are guided in the hollow portion of the propulsion shaft 3 and are formed in the variable shaft 16 in the axial direction, and are connected to two oil chambers in the cylinder 14 on the head side and the bottom side. .

The hydraulic pressure supplied from the pump 7 is supplied to the cylinder 14 through the hydraulic pipes 9 and 10 and the oil supply cylinders 11 and 12, and the hydraulic pressure is kept constant between the cylinder 14 and the solenoid valve 8. If hydraulic pressure is supplied to the cylinder 14 to move the piston 15 in any of the front and rear directions, this direct movement causes the rotation of the blade flange 5 by the crosshead 17, and the angle of the propeller blade 6 can be arbitrarily set. When the angle of the propeller blade 6 fluctuates due to oil leakage from the hydraulic pipes 9 and 10, the fluctuation of the angle is detected by the control system, the solenoid valve 8 is actuated, and hydraulic pressure is supplied to set the normal The angle was maintained.

[0007]

According to the blade angle changing device in the conventional marine propulsion device, oil leakage occurs from the fuel supply cylinders 11 and 12 due to aging, and the pressure in the cylinder 14 decreases. The angle of the propeller blade 6 sometimes moved. It is difficult to cope with such a change in the angle by the correction of the piston position by the conventional control system. Therefore, in order to maintain the angle of the propeller blade 6, the pressure between the cylinder 14 and the solenoid valve 8 must be constantly increased. Did not.

The present invention is directed to a turning type marine propulsion device having a blade angle varying device, in which the pressure of the angle varying actuator is maintained even if an oil leak occurs in the hydraulic system of the blade angle varying device. The purpose is to keep the angle.

[0009]

According to a first aspect of the present invention, there is provided a blade angle holding device provided on a ship so as to be capable of turning in a horizontal plane, and a turning center of the turning tube. A vertical drive shaft (2) provided and driven; a propulsion shaft (3) provided horizontally inside the swivel cylinder and interlocking with the vertical drive shaft; And a hydraulic supply system (hydraulic piping 9, which guides hydraulic pressure supplied from the ship side into the swivel cylinder)
10) and a marine vessel propulsion device having a blade angle changing device including an actuator (13) provided in the swivel cylinder and configured to set the angle of the propulsion blade by the hydraulic pressure. Stop means (pilot check valve 20)
It is characterized by having provided.

According to a second aspect of the present invention, in the wing angle maintaining device for a marine vessel propulsion device according to the first aspect, the actuator (13) comprises a cylinder (14) and a piston (15). A motion converting mechanism (blade flange 5, crosshead 17) for converting a linear motion of a piston into a rotary motion for setting an angle of the propeller blade, wherein the hydraulic check means includes the cylinder and the hydraulic supply; It is a check valve (pilot check valve 20) provided between the system (hydraulic piping 9, 10).

According to a third aspect of the present invention, there is provided a wing angle holding device for a marine vessel propulsion device, wherein the oil supply cylinder (hydraulic piping 9, 10) is provided with an oil supply cylinder. 11, 12) are provided,
The hydraulic check means (pilot check valve 20) is provided between the cylinder (14) and the refueling cylinder.

[0012]

FIG. 1 shows an entire marine vessel propulsion apparatus of this embodiment having a wing angle variable gear device and a wing angle holding device, and FIG. 2 shows the wing angle variable gear device and a wing angle holding device. The main part is shown. Note that, among the reference numerals in the drawing, the same reference numerals as those in FIG.

In this embodiment, the hydraulic piping 9 to the piston 15
10 is provided with a pilot check valve 20 as a hydraulic check means.
, The pressure in the cylinder 14 is maintained and the piston 15 is kept in place even when hydraulic oil is not supplied due to oil leakage from the seal portions of the oil supply cylinders 11 and 12.
Is held, and the angle of the propeller blade 6 is held without change.

In this embodiment, pilot check valves 20, 20 are provided in two hydraulic pipes 9, 10 for supplying hydraulic oil to two oil chambers of the cylinder 14, respectively. The pilot check valve 20 is located very close to a portion of the hydraulic pipes 9 and 10 connected to the cylinder 14, and in this example, the crosshead 1
7 is provided inside.

According to this embodiment, since the oil pressure is held between the cylinder 14 and the pilot check valve 20, the state of maintaining the angle of the propeller blade 6 does not depend on the state of the seal of the hydraulic system, the hydraulic equipment, and the like. .

Further, it is not necessary to keep the oil pressure between the pilot check valve 20 and the solenoid valve 8 high, and the oil pressure can be made lower than before, so that the driving force and heat generation of the pump 7 can be reduced. It becomes possible.

[0017]

As described above, according to the present invention,
In a marine propulsion device having a hydraulic wing angle varying device,
Hydraulic check means is provided in the hydraulic supply system, so even if an oil leak occurs at least on the supply side of the hydraulic check means or the hydraulic pump breaks down, the hydraulic pressure on the actuator side operated by hydraulic pressure is maintained. Thus, the effect that the angle of the propeller blade is maintained is obtained.

In particular, in the case where an oil supply cylinder in which hydraulic oil tends to leak is provided in the hydraulic supply system, the above effect can be obtained by providing the hydraulic check means between the actuator and the oil supply cylinder. Can be.

[Brief description of the drawings]

FIG. 1 is an overall structural diagram showing an example of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part according to an example of an embodiment of the present invention.

FIG. 3 is an overall structural view showing a conventional marine vessel propulsion device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Revolving cylinder, 2 ... Vertical drive shaft, 3 ... Propulsion shaft, 5 ... Blade wing which comprises a motion bias mechanism, 6 ... Propeller blade as a propulsion wing, 9, 10 ... Hydraulic piping as a hydraulic supply system, 1
Reference numerals 1, 12: refueling cylinder, 13: actuator, 14: cylinder, 15: piston, 17: crosshead as a motion conversion mechanism, 20: pilot check valve (check valve) as hydraulic check means.

Claims (3)

[Claims] 1. A swivel tube provided on a ship so as to be able to turn in a horizontal plane, a vertical drive shaft provided at a center of rotation of the swivel tube and driven, and horizontally provided inside the swivel tube. A propulsion shaft interlocked with the vertical drive shaft, a propulsion blade provided at an end of the propulsion shaft and rotating underwater, and a hydraulic pressure supply system for guiding hydraulic pressure supplied from a ship side into the swivel cylinder. A watercraft propulsion device having a blade angle changing device including an actuator provided in the turning cylinder and configured to set the angle of the propulsion blade with the hydraulic pressure; and a hydraulic check means provided in the hydraulic supply system. A blade angle holding device in a marine vessel propulsion device, comprising 2. The apparatus according to claim 1, wherein the actuator includes a cylinder and a piston, and further includes a motion conversion mechanism that converts a linear motion of the piston into a rotary motion for setting an angle of the propeller blade. 2. The blade angle holding device in a marine propulsion device according to claim 1, wherein the check valve is a check valve provided between the cylinder and the hydraulic pressure supply system in the turning cylinder. 3. A blade angle holding device in a marine propulsion device according to claim 2, wherein an oil supply cylinder is provided in said hydraulic supply system, and said hydraulic check means is provided between said cylinder and said oil supply cylinder. .