JP3170759B2 - Radio-controlled unmanned helicopter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio-controlled unmanned helicopter such as an industrial unmanned helicopter or a model helicopter for spraying a medicine.

[0002]

2. Description of the Related Art Unlike a manned helicopter, a radio-controlled unmanned helicopter such as an industrial unmanned helicopter or a model helicopter for spraying a drug on a field is operated by a ground driver, and therefore, the engine speed and fuel consumption are reduced. It is difficult to obtain data on operating conditions such as the remaining amount.

For this reason, when adjusting the rotation speed of the main rotor by changing the pitch angle of the main rotor, the rotation speed of the main rotor or the engine is indirectly measured using a measuring instrument for measuring a change in light or sound. Then, it is checked whether the numerical value is within the standard, and when the numerical value is outside the standard, the pitch angle is adjusted by adjusting the pitch trim of the transmitter.

[0004]

However, measuring the rotational speed of the main rotor indirectly by using various measuring instruments in this way is troublesome in the measurement work, and thus often relies on the five senses. Therefore, the adjustment becomes inaccurate, and the helicopter cannot always exhibit its original performance.

[0005]

The present invention has been made in view of the above problems, and has as its object to provide a radio-controlled unmanned helicopter capable of transmitting the rotation speed of a main rotor to a pilot on the ground.

[0007]

A radio-controlled unmanned helicopter according to the present invention is provided with a main rotor at an upper part of a fuselage, and transmits power to the main rotor from an engine in the body via a power transmission mechanism. An unmanned helicopter, wherein the main rotor is configured such that a pitch angle is adjusted by a pitch trim adjuster provided in a transmitter, and an indicator for displaying the rotation speed of the main rotor is provided outside the fuselage. It is.

[0008]

The number of revolutions of the main rotor is transmitted to the operator by looking at the display on the fuselage.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. 1 is a side view of a radio-controlled unmanned helicopter according to the present invention, FIG. 2 is an enlarged side view showing an engine part of the radio-controlled unmanned helicopter according to the present invention, FIG. 3 is an exploded perspective view of the engine part, FIG. 4 is an enlarged perspective view showing a main part of the radio-controlled unmanned helicopter according to the present invention.

In these figures, reference numeral 1 denotes a radio-controlled unmanned helicopter for spraying a medicine. This unmanned helicopter 1
Is a single-rotor type having a main rotor 3 at the front of the body 2, in which an engine 4, a fuel tank 5, a radio control receiver (not shown) and the like are mounted. Also,
In FIG. 1, reference numeral 6 denotes an auxiliary rotor provided at the rear end of the body 2, and reference numeral 7 denotes a display for displaying the number of rotations of the rotor.

As shown in FIG. 4, the display 7 has a display portion 7a on its surface for digitally displaying the number of revolutions of the main rotor 3 by an LED, and the left side of the body 2 as shown in FIGS. It is fixed to the surface. The display 7 can be attached to the front, rear, or lower surface of the body 2 in addition to the above-mentioned positions, as long as the position is relatively easy to see. Also, this display 7
It is connected to a rotor speed sensor indicated by reference numeral 8 in FIGS. 2 and 3, and is configured to display the speed of the main rotor 3 detected by the rotor speed sensor 8 on a display unit 7a.

The rotor speed sensor 8 is fixed to the body 2 so as to face a pickup 10 projecting from a main mast 9 for driving the rotor with a slight gap. In this embodiment, the rotor rotation speed sensor 8 detects that the pickup 10 comes into contact with or separates from the leading end detection unit due to the rotation of the main mast 9 as a change in the magnetic flux of the internal coil. Mast 9
Of a structure that detects the number of rotations is used.

As shown in FIG. 2, the main mast 9 has a rotor drive mechanism 11 mounted on the upper end thereof, and the upper and lower gear cases 1 of the power transmission mechanism 12 shown in FIG.
3 and 14 are rotatably supported. The rotor speed sensor 8 is supported and fixed to the upper gear case 13. The position where the rotor speed sensor 8 and the pickup 10 are arranged is located between the rotor drive mechanism 11 and the power transmission mechanism 12 and below the swash plate 11a of the rotor drive mechanism 11.

In FIG. 3, 15 is a bearing for supporting the main mast 9, 16 is a drive axle connected to the lower end of the main mast 9, and 17 is a ring gear attached to the drive axle 16. A counter gear 18 meshes with the ring gear 17, and this counter gear 18 is also rotatably supported by the upper and lower gear cases 13, 14. Reference numeral 19 denotes a drive gear fixed to an engine output shaft (not shown). The drive gear 19 meshes with the counter gear 18 to rotate the counter gear 18.

That is, in this power transmission mechanism, the rotation of the output shaft of the engine 4 is transmitted from the drive gear 19 via the counter gear 18 and the ring gear 17 to the drive axle 16.
The main mast 9 rotates together with the drive axle 16 and the main rotor 3 rotates.
Reference numeral 20 in FIG. 3 denotes a mast fixing bolt. In FIG. 4, reference numeral 21 denotes a transmitter, 22 denotes an elevator / ladder stick of the transmitter 21, 23 denotes a throttle / aileron stick, and 24 denotes a pitch trim knob.

In the unmanned helicopter 1 having the display 7 as described above, when the engine is started and the main rotor 3 rotates, the rotation speed of the main rotor is displayed on the display 7a of the display 7. For example, when the rotation speed of the main rotor 3 is smaller than the reference rotation speed at takeoff, the transmitter 2
For example, by turning the pitch trim knob 24 of 1 in a counterclockwise direction,
The pitch angle of the main rotor 3 is reduced and the rotation speed is adjusted so as to match the reference rotation speed.

In order to know the number of revolutions of the main rotor 3 during the flight, the aircraft 2 is brought into the vicinity of the operator or the display 2 is viewed by using binoculars or the like.

Therefore, according to the radio-controlled unmanned helicopter configured as described above, the operator can see the display 7 of the airframe 2 so that the main rotor speed is transmitted to the operator.

In this embodiment, the rotor speed sensor 8 for detecting the speed of the main rotor 4 is arranged near the swash plate 11a to detect the rotation of the main mast 9 itself. When detecting the rotation of the main mast 9, the rotation of the member that rotates the same as the main mast 9 may be detected. That is, a pickup may be provided on a rotating member positioned on an axis indicated by a dashed line A in FIG. 3, and the rotation may be detected by a rotation speed sensor.

Further, in order to detect the rotation of the main rotor 4, in addition to directly detecting the rotation of the main mast 9 and the member rotating therewith as described above, a method of detecting from the ignition pulse of the engine 4 is employed. You can also. In such a case, the engine speed obtained from the ignition pulse is calculated and the main mast speed taking into account the reduction ratio of the power transmission mechanism 12 is obtained.

Furthermore, in each of the above-mentioned examples, the rotation speed of the main rotor 3 is used as the data relating to the operating state displayed on the display 7, but in addition, the remaining fuel amount, the voltage value of the battery and the remaining amount of the medicine are displayed. It can also be done.

When the remaining fuel amount is displayed on the display 7, the remaining fuel amount can be accurately grasped, and the fuel can be replenished at the most appropriate time.
When the battery voltage value is displayed, when the battery voltage value falls below the reference, it is possible to quickly land and charge or replace the battery. The amount of the medicine can be applied.

Further, as the display 7, one display 7a is provided as shown in this embodiment, and the display 7a is provided.
In addition to the structure in which one type of data is displayed, a structure in which a plurality of display units 7a are provided for each data may be employed. When one display unit 7a is used to reduce the weight, a plurality of data can be displayed on one display unit 7a. If you do so,
A rotation speed sensor, a fuel remaining amount sensor, a battery voltage sensor, a medicine remaining amount sensor, and the like may be connected to the display 7 via the selection device. As the selection device, a device that switches a contact point of wiring from each sensor by a servo motor or a step motor can be considered.

In addition, in this embodiment, a digital display type is adopted as a display. However, the present invention is not limited to such a limitation, and various kinds of operation state data are displayed using LED lamps of different colors. It can also be done. In this case, for example, the red LED lamp is turned on when the rotation speed of the main rotor is higher than the reference rotation speed, and the lighted LED lamp is turned on when the rotation speed is lower than the reference rotation speed. In a conventional radio-controlled unmanned helicopter, the fuel level can only be obtained from experience, so the refueling time is earlier than the optimal time, and the number of takeoffs and landings is likely to increase. Since the amount could not be detected accurately, the amount of medicine sprayed sometimes became inappropriate,
By providing an indicator for displaying the remaining fuel amount, the remaining medicine amount, the battery voltage value, and the like in addition to the indicator for displaying the rotation speed of the main rotor, it is possible to fly as desired without waste.

[0025]

As described above, the radio-controlled unmanned helicopter according to the present invention is provided with a main rotor at the upper part of the fuselage, and transmits the power to the main rotor from an engine in the fuselage via a power transmission mechanism. An unmanned helicopter, wherein the main rotor is configured such that a pitch angle is adjusted by a pitch trim adjuster provided in a transmitter,
Since an indicator for displaying the number of rotations of the main rotor is provided outside the fuselage, data relating to the operating state can be transmitted to the pilot by looking at the indicator on the fuselage.

Therefore, the pitch angle can be adjusted accurately, and the helicopter can exhibit its full potential.

[Brief description of the drawings]

FIG. 1 is a side view of a radio-controlled unmanned helicopter according to the present invention.

FIG. 2 is an enlarged side view showing an engine part of the radio-controlled unmanned helicopter according to the present invention.

FIG. 3 is an exploded perspective view of an engine portion of the radio-controlled unmanned helicopter according to the present invention.

FIG. 4 is an enlarged perspective view showing a main part of the radio-controlled unmanned helicopter according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio-controlled unmanned helicopter 3 Main rotor 4 Engine 5 Fuel tank 7 Display 8 Speed sensor 9 Main mast 10 Pickup

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A63H 27/133 A63H 30/04 A01M 7/00 B64D 45/00 B64C 27/04

Claims (1)

(57) [Claims] 1. A main rotor is provided on an upper part of an airframe.
To the inrotor from the engine inside the aircraft via the power transmission mechanism
A radio-controlled unmanned helicopter that transmits power
Pitch trim adjustment provided for the main rotor in the transmitter
The pitch angle is adjusted by a container,
A display for displaying the number of rotations of the main rotor.
Radio-controlled unmanned helicopter, characterized in that the.