JP2000198494A - Co-axial dual-rotor type helicopter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dual-axial dual-rotor type helicopter provided with a mechanism capable of preventing upper and lower rotors from striking persons or fixed objects on the ground. SOLUTION: The helicopter 1 is provided with a protective frame 10 surrounding the outer peripheries of upper and lower rotors 8, 9. A plastic perforated plate 60 is installed on the outer periphery of the protective frame 10, and an annular air tube 70 is further installed on the outer peripheral surface of the perforated plate 60. Even at the time of low altitude flight of the helicopter 1, the rotors 8, 9 do not directly strike persons working on the ground or fixed structures. Further, impact at the time of collision can be relaxed by the air tube 70. Thus, a helicopter suited to low altitude works can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial twin-rotor helicopter in which two vertically arranged rotors rotate in opposite directions about a common axis.

[0002]

2. Description of the Related Art The present applicant has previously described a coaxial twin rotor type helicopter for obtaining a propulsion force and a lift by reversely rotating two rotors arranged vertically above and below a common axis, thereby making the helicopter compact and compact. Proposal (Japanese Patent Application No. Hei 10-247)
657).

[0003] In a twin rotor helicopter, torque is canceled by arranging two identical rotors rotating in opposite directions to each other at the top and bottom, and a tail rotor is not required. It is suitable for small helicopters for work, radio control type work, etc.

[0004]

When a helicopter of this type is used for spraying pesticides or the like, unlike a general large-sized helicopter, there are many low-altitude flights, and there are many hovering states in low altitudes. For this reason, there is a high possibility that the rotating rotor hits a person working on the ground or the like.
Further, there is a high possibility that the rotor hits the electric wire or the like and cuts the electric wire.

An object of the present invention is to provide a safe coaxial twin-rotor helicopter in which the rotor does not hit a person or an electric wire in view of the above point.

[0006]

SUMMARY OF THE INVENTION To solve the above problems, the present invention is directed to a coaxial twin rotor helicopter having an upper rotor and a lower rotor rotating in opposite directions about a common axis of rotation. And a protective frame surrounding the outer circumferences of the upper rotor and the lower rotor concentrically.

The protection frame prevents the upper rotor and the lower rotor from directly hitting a person working on the ground. Similarly, adverse effects such as each rotor hitting an electric wire or the like and cutting it can be avoided.

Here, in order to reliably prevent each rotor from hitting a person, an electric wire or the like, it is desirable to cover the outer periphery of the protection frame with a cylindrical protection net.

Further, in order to protect a person or the like from an impact due to a collision when the protection frame hits a person or the like, it is desirable to cover the periphery of the protection frame or the protection net with an annular air tube.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coaxial twin-rotor helicopter for radio control according to the present invention will be described below with reference to the drawings.

(Overall Configuration) FIGS. 1 and 2 show the overall configuration and cross-sectional configuration of a coaxial twin-rotor helicopter of this embodiment. As shown in these figures, helicopter 1
A drive unit 5 having two engines 3 and 4 mounted on an upper end portion of the body 2, a coaxial inner rotor shaft 6 rotated in the opposite direction by the drive unit 5, and an outer It has a rotor shaft 7, an upper rotor 8 attached to the inner rotor shaft 6, and a lower rotor 9 attached to the outer rotor shaft 7.

Further, the helicopter 1 has upper and lower rotors 8,
9 has a protection frame 10 attached to the body 2 so as to surround the outer periphery of the body 9. The protective frame 10 is made of a light metal pipe or a plastic pipe, and has upper and lower annular pipes 11 and 12 arranged coaxially on the upper side and lower and larger annular pipes 11 arranged coaxially on the lower side. Side annular pipes 13, 14 and upper annular pipes 11, 1
2 and four radially extending horizontal connecting pipes 3 to 24 connecting the lower annular pipes 13 and 14 to each other.
1 to 34, four vertical connecting pipes 41 to 44 connecting the large-diameter upper and lower annular pipes 11 and 13 to each other, and extend downward from an intermediate position of the lower horizontal connecting pipes 31 to 34. It is composed of four leg pipes 51-54.

In this embodiment, a cylindrical perforated plate (mesh plate) 60 is attached so as to surround the outer peripheries of the upper and lower annular pipes 11 and 13 in the protective frame 10 having this configuration. The perforated plate 60 is made of, for example, a fiber-reinforced plastic.

Further, in this embodiment, the cylindrical perforated plate 6
A circular air tube 70 surrounds the outer circumference of
Is attached.

In the helicopter 1 according to the present embodiment, the outer circumferences of the upper and lower rotors 8 and 9 are protected by the protection frame 1.
0, so when flying at low altitudes, for example,
It is possible to avoid such an adverse effect that the rotor hits and injures a person working on the ground when hovering in a low altitude or the like. In addition, it is possible to avoid a problem that the rotor is hit by an electric wire or the like and the electric wire is cut.

In particular, in this embodiment, since the air tube 70 is attached to the outermost part, when the helicopter 1 hits a person or a fixed object on the ground, the impact force of the collision is reduced, and the person is injured, Damage to the fixed object on the ground can be reliably prevented.

In addition, since the outer peripheries of the upper and lower rotors 8, 9 are covered with a cylindrical perforated plate and an air tube, the formation of airflow in the vertical direction is promoted by these, and the thrust is increased. An auxiliary effect can also be expected.

(Other Embodiments) In the above example, the perforated plate and the air tube are attached to the outer periphery of the protection frame. However, a predetermined effect can be obtained even when only the protection frame is attached. Similarly, a predetermined effect can be obtained even when only the protective frame and the perforated plate are attached.

Next, the material of the protective frame, the material of the perforated plate, and the material of the air tube can be any material as long as it is lightweight and satisfies the required characteristics such as durability and strength. Good.

In the above example, a perforated plate made of plastic is used. Alternatively, a general net may be stretched around the outer periphery of the protective frame, or a perforated metal or the like may be attached.

On the other hand, the above example is for a radio-controlled helicopter, but the present invention can be similarly applied to a manned helicopter for single-seater use and the like.

[0022]

As described above, the coaxial dual-rotor helicopter of the present invention has the protection frame surrounding the outer circumferences of the upper and lower rotors. Therefore, during low altitude flight, it is possible to avoid the harmful effects of the upper and lower rotors hitting a person working on the ground, a fixed object on the ground, or the like, thereby injuring a person or damaging the fixed object on the ground.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a coaxial twin-rotor helicopter for radio control to which the present invention is applied.

FIG. 2 is a schematic cross-sectional view of a portion taken along line II-II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Helicopter 2 Body 3, 4 Engine 5 Drive part 6, 7 Shaft 8, 9 Rotor 10 Protective frame 11-14 Ring pipe 21-24, 31-34 Horizontal connection pipe 41-44 Vertical connection pipe 51-54 Leg pipe 60 Perforated plate (mesh plate) 70 Air tube

Claims (3)

[Claims] 1. A coaxial twin-rotor helicopter comprising an upper rotor and a lower rotor rotating in opposite directions about a common rotation center axis, wherein a protective frame surrounding the outer circumferences of the upper rotor and the lower rotor concentrically. A coaxial twin rotor helicopter comprising: 2. The coaxial twin-rotor helicopter according to claim 1, further comprising a cylindrical protection net surrounding the outer circumference of the protection frame. 3. The coaxial twin-rotor helicopter according to claim 1, further comprising an annular air tube surrounding the protection frame or the protection net.