JP4198396B2 - Wing angle detector in ship propulsion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for feeding back the actual blade angle of a variable pitch propeller in a swivel type ship propulsion device equipped with a variable pitch propeller in a swivel cylinder provided in a ship.
[0002]
[Prior art]
In general, ships control the specifications such as motion performance, maneuverability and speed by adjusting the rotation speed and pitch of the propeller. Here, the variable pitch propeller is often driven by a servo cylinder, and a desired actual blade angle cannot be obtained unless feedback control is performed.
[0003]
FIG. 5 shows a blade angle detection device in a conventional marine vessel propulsion device provided with a variable pitch propeller by feedback control. The propeller blade 1 is operated via a variable pitch mechanism incorporated in the hub 2. 3 is a propulsion shaft, 4 is a vertical drive shaft, and 5 is a prime mover shaft, and the generated power of the prime mover 8 is transmitted to the hub 2 by bevel gears 6 and 7. Reference numeral 9 denotes a revolving cylinder, which protrudes vertically from a lower portion of the ship bottom 10 and is revolved by a revolving motor 13 by gears 11 and 12. A servo cylinder 14 is a variable pitch drive mechanism, and is provided in the hub 2. A reciprocating piston 15 is built in the servo cylinder. Reference numeral 16 denotes a rod whose one end is coupled to the piston 15, passes through the propulsion shaft 3, and is connected to a long chain 20 via a bearing 17 and a connection plate 18. The other end of the chain 20 is connected to a feedback ring 21 via a pulley 19.
[0004]
The feedback ring 21 has a center hole 22 through which the vertical drive shaft 4 is inserted and a guide hole 23 through which the guide rod 33 slides. The feedback ring 21 swivels together with the swivel cylinder 9 and can be moved up and down along the guide rod 33. The input shaft of the blade angle transmitter 25 is slidably engaged with the peripheral portion of the feedback ring 21 via the ring 26. In the swivel cylinder 9, a chain 20 connects the feedback ring 21 and the mounting plate 18.
[0005]
The feedback ring 21 is provided with a barrel side of a hydraulic cylinder 32 as an urging means. The rod of the hydraulic cylinder 32 is provided at a predetermined position in the revolving cylinder 9. If the revolving cylinder 9 revolves, the feedback cylinder 21 and the hydraulic cylinder 32 revolve. The hydraulic cylinder 32 always applies an upward force to the feedback ring 21 so that the chain 20 does not slack.
[0006]
FIG. 6 is a view showing the vicinity of the feedback ring in another example of the blade angle detection device in the conventional marine vessel propulsion device. 6 that are substantially the same in function as those illustrated in FIG. 5 are denoted by the same reference numerals as those used in FIG. 5 and description thereof is omitted.
In this example, a coil spring 40 is interposed in a guide rod 33 that guides the raising and lowering of the feedback ring 21, and a chain 20 that is linked to a servo cylinder is connected to one of the guide rods 33.
[0007]
[Problems to be solved by the invention]
According to the conventional blade angle detection device shown in FIG. 5, since the hydraulic cylinder 32 is used to hold the position of the feedback ring 21, it is necessary to always operate the hydraulic pump 35. When this is stopped, the feedback ring 21 is stopped. As a result, the chain 20 slackened, and the exact blade angle position could not be detected.
[0008]
In addition, according to another conventional blade angle detection device shown in FIG. 6, the general coil spring 40 is used as the biasing means of the feedback ring 21 as described above. If it changes, the reaction force will change greatly, so that the tension of the chain 20 will change greatly depending on the position of the feedback ring 21, and the resulting difference in elastic deformation of the chain 20 will be inconvenient for accurate blade angle position detection. There was a problem.
[0009]
The present invention has been made in order to solve the above-described problems, and can always give a stable lifting force to the feedback ring with a simple configuration. In particular, the lifting force may vary depending on the position of the feedback ring. Therefore, an object of the present invention is to provide a blade angle detection device capable of performing accurate blade angle position detection.
[0010]
[Means for Solving the Problems]
The wing angle detection device for a ship propulsion device according to claim 1 is a swivel cylinder 9 provided on the ship so as to be turnable in a horizontal plane, and a vertical drive provided by being provided at the turning center of the swivel pipe. A drive shaft 4, a propulsion shaft 5 provided horizontally inside the swivel cylinder and interlocking with the vertical drive shaft, a propeller blade 1 provided at an end of the propulsion shaft and rotating in water, and the propulsion It is provided in the ship propulsion apparatus which has the drive mechanism 14 which sets the pitch of a wing. The blade angle detection device is assumed to include the following components. First, it has a blade angle transmitter 25 that is operated in conjunction with the drive mechanism and outputs a signal indicating the actual blade angle of the propulsion device. Moreover, it has the guide means 33 fixed perpendicularly to the predetermined position in the said turning cylinder so that it may turn with the said turning cylinder. The swivel cylinder has a center hole 22 through which the vertical drive shaft is inserted and a guide hole through which the guide means slides, and swivels together with the swivel cylinder and can be moved up and down along the guide means. A feedback ring 21 is provided inside. Moreover, it has the connection body 26 provided in the input shaft of the said blade angle transmitter, and slidably connected with the peripheral part of the said feedback ring. Moreover, it has the connection long body 20 which is arrange | positioned perpendicularly | vertically within the said turning cylinder and connects the said feedback ring and the said drive mechanism. And it is provided in the predetermined position in the said turning cylinder so that it may turn with the said turning cylinder, and the biasing means which urges | biases the said feedback ring upward so that the said connection long body may not loosen is provided. In this blade angle detection device, the present invention is characterized in that the biasing means is a constant reaction force spring 50 that applies a constant biasing force regardless of the position of the feedback ring that moves up and down. .
[0011]
A wing angle detection device according to a second aspect of the invention is characterized in that, in the wing angle detection device for a ship propulsion device according to the first aspect, the constant reaction force spring is a gas spring 60.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The blade angle detection device of the present invention is a variable pitch type propulsion and turning device for marine propulsion, and as a biasing means for assisting the operation of the feedback ring, instead of a conventional hydraulic cylinder or coil spring, A force spring such as a gas spring is used.
[0013]
FIG. 1 shows an embodiment of the apparatus of the present invention. Note that, in the configuration of the present embodiment, the same reference numerals are given to portions common to the configuration of FIG.
In FIG. 1, the rod 16 having one end connected to the piston 15 passes through the propulsion shaft 3. A rod 17 has a bearing 17 and a mounting plate 18 at the tip thereof, and one end of a chain 20 which is a long connecting body is connected to the mounting plate 18. The other end of the chain 20 is connected to a feedback ring 21 via a pulley 19.
[0014]
A guide rod 33 as a guide means is attached inside the swivel cylinder 9. The guide rod 33 is fixed vertically to a predetermined position in the swivel tube 9 so as to swivel together with the swivel tube 9. There are four guide bars 33 in this example, and they are arranged around the vertical drive shaft 4 at equal angular intervals. It goes without saying that the guide rods 33 are not necessarily limited to being arranged at equiangular intervals.
[0015]
The feedback ring 21 provided in the inside of the swivel cylinder 9 has a center hole 22 through which the vertical drive shaft 4 is inserted and a bush 34 provided in a guide hole in which the guide rod 33 slides. The feedback ring 21 swivels together with the swivel cylinder 9 and can be moved up and down along the guide rod 33.
[0016]
A ring 26 is provided on the input shaft of the blade angle transmitter 25. The ring 26 is slidably engaged with the peripheral edge of the feedback ring 21. Therefore, even if the feedback ring 21 swivels together with the swivel cylinder 9, the ring 26 of the blade angle transmitter 25 installed at a predetermined position does not come off from the feedback ring 21.
[0017]
In the swivel cylinder 9, a chain 20 as a vertically connected long body connects the feedback ring 21 and the mounting plate 18.
[0018]
A constant reaction force spring 50 is attached between the feedback ring 21 and a predetermined position in the revolving cylinder 9. If the revolving cylinder 9 revolves, the constant reaction force spring 50 revolves together with the feedback ring 21. In this example, the constant reaction force spring 50 is installed between four guide rods 33 arranged at equal intervals at 180 ° intervals in the rotation direction of the feedback ring 21. However, it goes without saying that the constant reaction force springs 50 are not necessarily arranged at intervals of 180 °.
[0019]
The constant reaction force spring 50 always applies a predetermined upward force to the feedback ring 21 so that the chain 20 does not loosen, and the force is constant and stable regardless of the position of the feedback ring 21 in the ascending / descending direction. . For this reason, the tension of the chain 20 is kept constant regardless of the position of the feedback ring 21, and the amount of elastic deformation generated in the chain 20 is also constant, so that an accurate blade angle position can be detected.
[0020]
That is, according to this example, the displacement in the horizontal direction of the piston 15 is accurately transmitted as the displacement in the vertical direction to the blade angle transmitter 25 via the feedback ring 21 and the ring 26. In addition, according to this example, the bush 34 is provided on the guide rod 33 in order to maintain the attitude of the feedback ring 26, so that the attitude of the feedback ring 21 can be kept horizontal even when a rising force is applied by the constant reaction force spring 50. The holding action can be obtained more reliably.
[0021]
That is, if the guide rod is simply inserted directly into the hole of the feedback ring 21, when the blade angle is actually changed and the chain 20 is pulled or loosened, the hole of the feedback ring 21 and the guide rod. However, according to this example, the feedback ring 21 is not tilted, and the guide ring 33 is held via the bush 34 while maintaining the posture horizontally without tilting. On the other hand, it can move smoothly.
[0022]
2 to 4 show other embodiments of the device of the present invention. Note that, in the configuration of the present embodiment, portions common to the configuration of FIG. 1 are denoted by corresponding reference numerals, and description of the configuration is omitted. As shown in FIG. 2, the blade angle detection device of this example uses a gas spring 60 having a function as a constant reaction force spring as an urging means for assisting the operation of the feedback ring 21.
[0023]
As shown in FIG. 3, the gas spring 60 includes a sealed cylinder 61, a piston 62 that moves in the cylinder 61 in the axial direction, and a rod 63 that is integrally connected to the piston 62. The rod 63 airtightly penetrates one end side of the cylinder 61 via the seal 64 and the guide 65 and protrudes to the outside. The inside of the cylinder 61 is divided into two chambers by a piston 62. A compressed gas (for example, nitrogen gas) 66 is sealed in the two chambers, and an orifice 62a for communicating the two substances is formed in the piston 62. Has been. Further, an appropriate amount of oil 67 is filled in the cylinder 61, and the speed of expansion and contraction can be controlled by the oil 67. Attachment portions 68 and 69 are provided at the tip of the rod 63 and the other end of the cylinder 61, respectively.
[0024]
As shown in FIG. 2, the gas spring 60 is connected to the stationary part of the apparatus in which the attachment part 69 at the other end of the cylinder 61 is connected to the upper feedback ring 21 and the attachment part 68 at the tip of the rod 63 is below. Has been. The attachment position of the gas spring 60 is close to the guide rod 33 that slides on the bush 34 of the feedback ring 21 and is outside the guide rod 33 with respect to the vertical drive shaft 4.
[0025]
Since the gas spring 60 uses the reaction force of the gas 66 sealed in the cylinder 61 as a spring, the gas spring 60 is smaller than an elastic body such as a coil spring or rubber, but has a small spring constant with a large initial load. It is done. Therefore, as shown in FIG. 4, the load with respect to the stroke is substantially constant regardless of the stroke. In a conventional coil spring that has been conventionally used as a biasing means for a feedback ring, the stroke and the load are almost directly proportional to each other as shown in FIG. 4, whereas in the gas spring 60, regardless of the stroke, that is, the feedback ring. Regardless of the position of the lift 21 in the up-and-down direction, the force applied to the feedback ring 21 is substantially constant, and the amount of elastic deformation generated in the chain 20 is also constant, so that an accurate blade angle position can be detected.
[0026]
【The invention's effect】
As described above, according to the blade angle detection device in the marine vessel propulsion device of the present invention, the constant reaction force spring is used as the feedback ring biasing means, so that a hydraulic device such as a hydraulic cylinder is not required. The blade angle can be detected even when stopped.
[0027]
In addition, the function of a constant reaction force spring that exerts a stable urging force regardless of the position of the feedback ring, for example, a gas spring, has the effect of further stabilizing the operation of the blade angle detection device as a whole.
[Brief description of the drawings]
FIG. 1 is a structural diagram showing an example of an embodiment of the present invention.
FIG. 2 is a structural diagram showing another example of the embodiment of the present invention.
3 is a cutaway perspective view showing a structure of a gas spring used in FIG. 2. FIG.
4 is a diagram showing a comparison between the characteristics of the gas spring shown in FIG. 3 and the characteristics of other urging means not used in the present invention. FIG.
FIG. 5 is a structural diagram showing a blade angle detection device in a conventional marine vessel propulsion device.
FIG. 6 is a structural diagram showing another example of a blade angle detection device in a conventional marine vessel propulsion device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Propeller blade | wing, 4 ... Vertical drive shaft, 5 ... Propulsion shaft, 9 ... Turning cylinder, 14 ... Servo cylinder as a drive mechanism, 16 ... Propulsion shaft, 20 ... Chain as a connection long body, 21 ... Feedback ring, DESCRIPTION OF SYMBOLS 22 ... Center hole, 25 ... Blade angle transmitter, 26 ... Ring as coupling body, 33 ... Guide rod as guide means, 34 ... Bush, 50 ... Constant reaction force spring, 60 ... Gas spring.

Claims (2)

A swivel tube provided on the ship so as to be able to turn in a horizontal plane, a vertical drive shaft provided at the turning center of the swivel tube and driven, and a vertical drive shaft provided horizontally within the swivel tube Provided in a marine vessel propulsion device having a propulsion shaft interlocking with the shaft, a propeller blade provided at an end of the propulsion shaft and rotating in water, and a drive mechanism for setting a pitch of the propeller blade,
A blade angle transmitter that is operated in conjunction with the drive mechanism and outputs a signal indicating the actual blade angle of the propulsion unit;
Guide means fixed vertically to a predetermined position in the swivel tube so as to swivel with the swivel tube;
There is a center hole through which the vertical drive shaft is inserted and a guide hole through which the guide means slides. The guide hole slides in the swivel cylinder and can be moved up and down along the guide means. A provided feedback ring;
A connecting body provided on an input shaft of the blade angle transmitter and slidably connected to a peripheral portion of the feedback ring;
A connecting elongated body that is arranged vertically in the swivel cylinder and connects the feedback ring and the drive mechanism;
In the blade angle detecting device provided with a biasing means provided at a predetermined position in the swirl tube so as to swirl together with the swirl tube, and biasing the feedback ring upward so that the connecting long body does not loosen,
The blade angle detection device in a marine vessel propulsion device, wherein the biasing means is a constant reaction force spring that applies a constant biasing force regardless of the position of the feedback ring that moves up and down.   The blade angle detection device for a marine vessel propulsion device according to claim 1, wherein the constant reaction force spring is a gas spring.

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