JPH066876Y2 - Model helicopter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a model helicopter, and more particularly to a device for preventing damage to a decorative cover fixed to a tail boom that drives a tail rotor.

[Prior art]

For example, in a radio-controlled helicopter for a model, power is branched from a drive system that drives the main rotor by an engine and taken out, and the tail rotor is rotationally driven via a tail boom that incorporates interlocking means composed of a drive shaft or a drive belt. However, such a tail boom is apt to shake greatly due to the vibration generated from the engine and the interlocking means.

Due to the vibration of the tail boom, the tail boom may be supported or the makeup cover fixed to the tail boom may be cracked or cracked by the vibration of the tail boom.

Therefore, in order to prevent the decorative cover from being cracked or cracked due to the vibration of the tail boom, the decorative cover at the tail boom part should be thickened or a reinforcing rib should be provided inside the decorative cover. Then, the rigidity of the decorative cover is increased, and the decorative cover having the increased rigidity is screwed to the tail boom to receive the vibration of the tail boom, or the decorative cover is screwed to the tail boom.

[Problems to be solved by the device]

In the above conventional structure, first, the structure is complicated and expensive because ribs are provided to the decorative cover to sufficiently withstand the vibration of the tail boom and reinforcement is performed to partially increase the wall thickness. There was a problem that it would end up.

In addition, there is a problem that productivity is low because the structure becomes complicated and time-consuming.

In addition, if the tail boom part's decorative cover is thickened or ribs are added to reinforce it, the weight will increase accordingly, not only the balance of the aircraft will be bad, but also the agility of the aircraft will be poor. There was also a problem to say.

The present invention has been proposed in view of the above problems, and in order to prevent damage to the decorative cover of the tail boom part by receiving the vibration of the tail boom without increasing the weight of the decorative cover of the tail boom part of the model helicopter. The purpose is to do.

[Means for Solving the Problems]

In order to achieve the above object, a model helicopter according to the present invention has a driving means for driving a main rotor, and a motive power branched from a drive system of the main rotor and rotatably supported by a cylindrical tail boom. In a model helicopter configured to transmit to a tail rotor by an interlocking means formed of a transmission shaft, and to cover the outer peripheral surface of the tail boom with a decorative cover, at least a part of the tail boom in the longitudinal direction of the tail boom An elastic member is interposed between the outer peripheral surface of the and the decorative cover facing the outer peripheral surface.

[Action]

The tail boom vibrates due to the vibration generated from the drive means of the main rotor, the drive system and the interlocking means for driving the tail rotor.The vibration of the tail boom is generated between the outer peripheral surface of the tail boom and the facing cover facing the tail boom. The elastic member provided absorbs.

Therefore, the vibration of the tail boom is prevented from directly acting on the decorative cover.

〔Example〕

An embodiment of a model helicopter according to the present invention will be described below with reference to the drawings.

FIG. 1 is an overall perspective view of a model helicopter, and FIG. 2 is a vertical side view of the model helicopter, in which reference numeral 1 generally represents the model helicopter.

The model helicopter 1 is a radio-controlled model helicopter, and includes an engine 5 (driving means) that rotationally drives a main rotor 3 and a stabilizer 4 by a drive system 2 described later, and control devices 6 that control the engine 5. Equipment frame 7 with interior and equipment frame 7
A rod-shaped tail boom 10 extending rearward from the upper half of the upper part and having interlocking means 9 for rotationally driving the tail rotor 8, and a decorative cover 11 for covering the equipment frame 7 and the outer peripheral surfaces of the tail boom 10. Consists of.

The main rotor 3 and the stabilizer 4 are control devices 6
The pitch angle of each pitch angle is controlled by a pitch servo 13 controlled by a control signal from a control amplifier 12 forming a part of the above.

The drive system 2 for rotationally driving the main rotor 3 and the stabilizer 4 includes a rotor shaft 15 in which the main rotor 3 and the stabilizer 4 are connected to the upper end of the rotation of the engine 5 via a clutch bell (not shown) and a drive gear 14. Is configured to rotate.

The interlocking device 9 that rotationally drives the tail rotor 8 branches and takes out the rotational driving force from the drive system 2 that rotationally drives the main rotor 3 and the stabilizer 4 by the pinion gear 16 that meshes with the upper surface of the drive gear 14. It is formed so that the rotational driving force is transmitted to a gear box 18 provided at the end of the tail boom 10 by a transmission shaft 17 made of a piano wire or the like.

The decorative cover 11 for covering the outer peripheral surfaces of the device frame 7 and the tail boom 10 is formed by processing a thin synthetic resin sheet as shown in FIG. Is formed by a rear side cover 11a that covers the left and right parts of the rear side cover 11a, an upper surface cover 11b that covers the upper surface of the rear side cover 11a, and a front side cover 11c that covers the front half of the device frame 7.
An elastic member 19 is provided in a portion of the a covering the tail boom 10.

As shown in FIGS. 2 and 3, this elastic member 19 is made of an elastic material such as sponge into a donut shape having a slit 20 in the upper portion, and the slit 20 is opened to open the tail boom 1.
The elastic member 19 is fitted to the central portion of 0 and the tip portion,
By covering the rear side cover 11a so as to sandwich both elastic members 19, the rear side cover 11a is supported and fixed to the tail boom 10.

In the model helicopter 1 configured as described above, the tail boom 10 vibrates due to vibrations when the engine 5 is driven and vibrations generated from the interlocking means 9 that drives the driving means 2 of the main rotor 3 and the tail rotor 8. Since the vibration of the tail boom 10 is absorbed by the elastic member 19 provided between the outer peripheral surface of the tail boom and the rear side cover 11a facing the outer peripheral surface of the tail boom, the tail boom 10 is mediated by the elastic member 19.
Vibration of the tail boom 10 is prevented from directly acting on the rear side cover 11a supported by the.

Although the thin synthetic resin sheet is molded and processed to form the decorative cover 11 in the above-described embodiment, the decorative cover is formed of glass fiber as in the conventional case, and the tail boom is formed on the decorative cover with the glass fiber. It is needless to say that the present invention can be applied to a device for supporting the above.

Further, in the above embodiment, the elastic member 19 is attached to the tail boom 10.
Although the elastic member 19 absorbs the vibration of the tail boom 10 and protects the decorative cover from the vibration, the elastic member 19 protects the cosmetic cover from the vibration. It should be provided only in.

[Effect of device]

As described above, according to the present invention, an elastic member is interposed between at least a part of the tail boom in the longitudinal direction between the outer peripheral surface of the tail boom and the facing cover facing the tail boom, and the elastic member vibrates the tail boom. Since it is designed to absorb makeup, it is not necessary to increase the thickness of the decorative cover facing the tail boom or to provide reinforcing ribs as in the conventional case. Has the advantage that it can be manufactured at low cost.

Moreover, since the structure is simple, it does not require time and effort to manufacture the decorative cover, and the productivity thereof can be greatly improved.

In addition, the decorative cover of the tail boom part remains thin, and the elastic member interposed between the outer peripheral surface of the tail boom and the facing cover facing the tail boom can be provided at least at the maximum vibrating part of the tail boom. Good, the weight of the decorative cover can be increased and the weight can be significantly reduced compared to the conventional one where the reinforcing ribs are beamed over the whole, and the increase in weight will deteriorate the balance of the aircraft and the agility of the aircraft. There is also an effect that it can be prevented.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an overall perspective view of a model helicopter, FIG. 2 is a vertical side view thereof, FIG. 3 is an exploded perspective view of a decorative cover portion, and FIG. Part 1
It is a partial cutaway perspective view. 1 ... Model helicopter, 2 ... Drive system, 3 ... Main rotor, 5 ... Drive means (engine), 8 ... Tail rotor, 9 ... Interlocking means, 10 ... Tail boom, 1
1 ... Makeup cover, 17 ... Conductive shaft, 19 ... Elastic member.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A tail rotor comprising: a drive means for driving a main rotor; and an interlocking means formed by a transmission shaft rotatably supported by a cylindrical tail boom for taking out power taken out from a drive system of the main rotor. In a model helicopter configured to transmit the outer surface of the tail boom with a decorative cover, the outer surface of the tail boom and a decorative cover facing the outer surface of the tail boom are provided on at least a part of the longitudinal direction of the tail boom. A model helicopter characterized by having an elastic member interposed between.