JPH0627200Y2 - Tail drive device in radio-controlled helicopter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, the tail drive part of a radio-controlled helicopter that can be operated by a radio-controlled vehicle is unitized so that the drive shaft can be accurately aligned and easily assembled. The present invention relates to a tail drive device in a radio-controlled helicopter that can be used.

[Prior Art] Conventionally, it can be operated by radio control. A small model helicopter is produced and used for hobby or photography.

In the tail drive system that drives the tail rotor of this radio-controlled helicopter, a bearing is attached to the inner wall of the fuselage, and the drive shaft is supported by this bearing.Therefore, the straight line of the drive shaft is accurately output depending on the state of each component and the mounting part. Difficult, thus making it difficult to center the bearing and making it difficult to rotate the drive shaft smoothly, which makes the tail drive system difficult to assemble and heavy, etc. Has the drawback of.

[Problems to be Solved by the Invention] Therefore, the present invention aims to develop a tail drive device for a radio-controlled helicopter that is suitable for a small model radio-controlled helicopter and that is easy to assemble without the drawbacks of the above-mentioned conventional techniques. .

[Means for Solving the Problem] In order to achieve the above object, a tail drive device in a radio-controlled helicopter of the present invention transmits a rotational force from an engine to a tail rotor. An arbitrary number of drive shaft guides are arranged on the inner wall of a small-diameter pipe to guide a drive shaft made of a linear material such as a pipe, and one end side of the pipe is provided on the inner circumference of one end side of the tail gear holder. The tail gear is fitted to the taper part, the tail gear is arranged at the other end of the tail gear holder, the tail gear holder side is arranged at the rear part of the body of the radio control helicopter, and the other end side of the pipe is arranged at the pipe end. It can be mounted on a gear train that is rotated by the output of an engine that is placed in the front of the fuselage via a holder. It

[Operation] In the tail drive device in the radio-controlled helicopter configured as described above, the drive shaft guide rotatably supports the drive shaft by the pipe attached to the inner wall, thereby rotating the engine torque by a gear train,
The drive shaft, tail gear, and tail rotor are transmitted in this order to rotate the tail rotor.

Further, since both ends of the pipe are fixed by the frame and the tail gear holder, the pipe does not come into direct contact with the body of the radio-controlled helicopter, a straight line is easily drawn out, the centering is extremely easy, and the pipe is easy to handle. Will be things.

[Example] In order to further clarify the gist of the present invention,
An embodiment will be described with reference to the drawings.

1 to 3, in a radio-controlled helicopter, an extremely small engine 1 is connected to a fuselage via a frame 11.
Fixed to 16, the rotational output of the engine 1 goes through the gear train 12,
A muffler 18 is arranged outside the lower part of the body 16 so as to be discharged to the main rotor 13 and the tail rotor 14, and exhausted from the engine 1. Tail 15 and skits 17 on the bottom
Is provided.

The tail drive device 2 of the present invention is formed to transmit a rotational force from the gear train 12 to the tail rotor 14 and has an arbitrary number of drive shaft guides 23 on its inner wall.
And a small diameter carbon fiber pipe 22 and a drive shaft 24 made of a piano wire which is inserted into the pipe 22 and is rotatably supported by a drive shaft guide 23.
A tail gear holder 25 having a taper portion 251 that can be fitted to the pipe 22 and a tail gear 26 that can be fitted into and removed from the tail gear holder 25 are formed into a unit shape.

The pipe of the tail drive device 2 configured as described above
One end of the pipe 22 is inserted inside a cylindrical plastic pipe holder 21 having a slit, and the pipe holder 21 is fixed so as to be sandwiched between a pair of auxiliary members 21a.
It is fixed to the screw with a screw 11a. Meanwhile, the tail gear holder 25
Since the tapered portion 251 is provided on the inner wall of the tubular portion 25a of the pipe 22 so that it can be inserted into and removed from the pipe 22, the fitting is easy, and no special fixing means is required for axial attachment. Although it is fixed to such a fitting part via an adhesive such as epoxy or silicon, this causes vibration, but in the present invention, only fitting is necessary, so it is also possible to prevent this occurrence. Become.

Next, the drive shaft 24 is inserted into the pipe 22,
It is rotatably supported by the drive shaft guide 23,
One end thereof is connected to the gear train 12, while the other end thereof is connected to a tail gear 26 supported by a tail gear holder 25. Further, the tail gear holder 25 is formed so as to be fixed to the body 16 by a support plate 27.

In this way, the drive shaft 24 is pivotally supported in the pipe 22 to form a unit, and one end side of the tail drive device 2 is fixed to the engine 1 side, and the other end side is a rear support plate 27.
Since it only needs to be fixed to the drive shaft, the centering becomes extremely easy, and the rotation output of the engine 1 is transmitted to the drive shaft 24 by the gear train 12 while appropriately changing the rotation speed. In addition,
Since the rotating shaft of the engine 1 is arranged so as to be parallel to the rotating shaft of the main rotor 13, the rotating direction is changed by the bevel gear (not shown) in the gear train 12 to the rotating direction of the drive shaft 24. .

Next, the rotational force of the drive shaft 24 is transmitted to the tail gear 26, the rotational direction is changed by the bevel gear (not shown) in the tail gear 26 to the rotational direction of the tail rotor 14, and the rotational speed is also appropriately changed. It is transmitted to the tail rotor 14.

Although the drive shaft is only a piano wire in the embodiment of the present invention, a pipe wire having an extremely small diameter may be used, and the tail gear holder is formed integrally with the tail gear. However, other specific shapes and combinations, further materials, etc. are not limited to the above-mentioned embodiment, and within the scope where the above-mentioned object, operation and effect of the invention to be described later are achieved, It is needless to say that each of them may be arbitrarily set and none of these changes changes the gist of the present invention.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

The tail drive device in radio-controlled helicopters
A pipe having a relatively small diameter with a drive shaft guide installed therein, a drive shaft inserted therethrough, the pipe is fitted to the taper portion on one end side, and the tail gear is fitted to the other end side to mount the drive shaft. Since it is unitized with a rotatable tail gear holder etc., one end is fixed to the engine side and the other end is fixed so that the drive shaft can be freely rotated by the bearing mounted on the inner wall of the fuselage as in the past. As a result, it is not necessary to assemble the drive shaft to the gear on the tail rotor side, and as a result, the straight line of the drive shaft is difficult to come out depending on the state of the mounting part, so centering is not difficult and a small model can be assembled by just assembling the unit. Suitable for radio-controlled helicopters, it is extremely easy to perform centering, easy to assemble, and lighter in weight.

As described above, the present invention is extremely excellent in practical use.

[Brief description of drawings]

FIG. 1 shows a tail drive device in a radio-controlled helicopter according to an embodiment of the present invention. FIG. 1 is a front view showing a part of the radio-controlled helicopter attached to the radio-controlled helicopter, and FIG. Sectional view, FIG. 3 is A- of FIG.
FIG. 1 …… Engine 2 …… Tail drive device 11 …… Frame 12 …… Gear train 14 …… Tail rotor 22 …… Pipe 23 …… Drive shaft guide 24 …… Drive shaft 25 …… Tail gear holder 26 …… Tail gear

Claims (1)

[Scope of utility model registration request] 1. In a tail drive device for a radio-controlled helicopter for transmitting a rotational force from an engine to a tail rotor, a drive shaft made of a linear material such as a piano wire or a pipe can be optionally guided to an inner wall of a pipe having a small diameter. A number of drive shaft guides are provided, one end of the pipe is fitted to a taper portion provided on the inner circumference of one end of the tail gear holder, and a tail gear is provided at the other end of the tail gear holder. The tail gear holder side is arranged in the rear part of the body of the radio-controlled helicopter, and the other end side of the pipe can be attached to the gear train which is rotated by the output of the engine arranged in the front part of the body via the pipe holder. A tail drive device for a radio-controlled helicopter characterized by: