JP2023149349A - Folding mechanism of helicopter transmitter antenna shaft portion - Google Patents

Abstract

To provide a folding mechanism of a helicopter transmitter antenna shaft portion with consideration of ease of maintenance and replacement work to make it possible to land safely in an emergency in a transmitter antenna arranged vertically below the lower surface of a helicopter fuselage.SOLUTION: An antenna lifting device 100 includes a transmitter 10 attached on the undersurface of a fuselage, a lifting device 20 provided on the lower part of the transmitter 10, an antenna shaft 40 one end of which is mounted on the lifting device 20 in a swingable manner, and an antenna 50 provided on the other end of the antenna shaft 40. The antenna shaft 40 is provided with a folding mechanism 30 that is arranged on the antenna shaft 40 in a position located higher than the position of a skid of a helicopter when the antenna is deployed vertically downward and bends when a predetermined load is applied. The folding mechanism 30 is for gripping both ends of a plate-shaped fuse plate 31 that breaks when a predetermined load is applied.SELECTED DRAWING: Figure 1

Description

The present invention relates to a safety mechanism for a helicopter transmitter antenna shaft portion for prioritizing safe landing of a helicopter in an emergency in a transmitter antenna disposed vertically below the underside of a helicopter body.

A helicopter's transmission antenna is usually placed vertically downward on the underside of the aircraft, and must be placed below the skid to prevent radio waves from interfering with the helicopter's body.

Therefore, as in Patent Document 1, a mechanism in which the antenna can be raised and lowered or a mechanism in which the antenna can be folded has been adopted. During takeoff and landing, the antenna remains above the skid to avoid contact with the ground. Landing with the antenna lowered could cause the helicopter to become unstable, potentially causing the helicopter to roll over or the rotor to crash into the ground, leading to a serious accident.

The problem with the above-mentioned mechanism in which the antenna is placed below the skid is the case where the antenna part is lowered when landing, and the possible situations are: first, the elevator cannot be raised or lowered; An example of this is an emergency landing. Second, in the case of an operation error due to forgetting to raise the lifting device. Thirdly, there is a case where the lifting device cannot be raised due to malfunction due to external factors (such as motor failure).

In order to deal with these emergencies, antenna devices have been developed that allow the helicopter to land safely by bending the antenna that cannot be stored in the event of an emergency.

For example, in Patent Document 2, a weak recessed part made of a V-groove is provided in a part of a protection pipe that raises and lowers the antenna, and the antenna is forcibly hit on the ground during an emergency landing, and the antenna is protected by the impact. A mechanism is disclosed for safely landing the antenna by breaking and bending the pipe from the recess to push the antenna above the skid.

For example, Patent Document 3 discloses that the antenna pole is swingably attached to the lower surface of the helicopter body, and the antenna body is provided at the lower end of the antenna pole, and is connected to the side surface of the antenna pole from the lower surface of the fuselage. In a helicopter antenna device, the antenna pole is installed facing vertically downward when the actuator is retracted, and the antenna pole is retracted in a substantially horizontal direction when the actuator is extended. , the actuator is connected to the antenna pole via the slide hinge, and a plunger is provided to fix the position of the slide hinge to the side surface of the antenna pole, and when an excessive load is applied to the antenna pole in the vertical direction, the plunger is connected to the antenna pole. An emergency spring that constantly presses the slide hinge toward the aircraft body is attached to the antenna pole, and when the plunger comes off, the antenna pole and the antenna body are removed due to the pressing force of the emergency spring that presses the slide hinge. An antenna system with horizontal emergency retraction is disclosed.

Publication No. 59-99511 Publication No. 2-33369 Japanese Patent Application Publication No. 2006-304150

However, in Patent Document 2, the protection pipe, which is the main shaft of the antenna, is broken and bent from the recessed part to push the antenna upwards from the skid, so the protection pipe is damaged and cannot be reused. Moreover, even during maintenance, it is not possible to check the degree of deterioration of the weak recessed portions, which is extremely dangerous.

In addition, the antenna system of Patent Document 3 has a complicated structure for emergency situations, and it is possible that the plunger may not come off or the emergency spring may become stuck due to external factors and may not operate. There is a possibility that there is less guarantee that the system will operate reliably and safely in a few emergency situations. In addition, although this mechanism is very effective for vertical landings and emergency landings while moving in a straight line, due to the characteristics of helicopters, it is not limited to landing from the above-mentioned directions in an emergency. However, it is possible that the aircraft may land sideways or while moving backwards, so there is no guarantee that the operation will be effective.

The purpose of the present application is to provide a bending mechanism for a helicopter transmitter antenna shaft part that ensures safe landing in the above-mentioned emergency situation and also takes maintenance and replacement workability into consideration.

In order to address the above-mentioned problems, the present invention takes the following technical measures.
That is, the invention according to claim 1 provides an antenna lifting device for a transmitter antenna disposed vertically below a lower surface of a fuselage of a helicopter, wherein the antenna lifting device includes a transmitter and a lifting device provided at the bottom of the transmitter. an antenna shaft, one end of which is swingably attached to the elevating device; and an antenna provided at the other end of the antenna shaft, the antenna being deployed vertically downward on the antenna shaft. A bending mechanism is provided above the skid position of the helicopter and bends when a predetermined load is applied. This is a folding mechanism for a helicopter transmitter antenna shaft portion, characterized in that it is a gripping mechanism.

A second aspect of the present invention is the folding mechanism for a helicopter transmitter antenna shaft according to the first aspect, wherein the fuse plate has a swollen gourd shape at a portion to be gripped.

A third aspect of the present invention is the bending mechanism for a helicopter transmitter antenna shaft according to the first or second aspect, wherein the fuse plate has a cylindrical portion at which the fuse plate breaks.

Further, the invention as set forth in claim 4 is characterized in that the bending mechanism is configured to grip the fuse plate by equally disposing the fuse plate at a plurality of positions on a circumference when viewed from above. This is the bending mechanism of the helicopter transmitter antenna shaft portion according to item 1.

Further, the invention according to claim 5 is characterized in that the bending mechanism is configured to grip the fuse plate by arranging the fuse plate at three equal positions on a circumference when viewed from above. This is the bending mechanism of the antenna shaft section.

Further, in the invention as set forth in claim 6, the antenna shaft has a hollow shape, a cable for controlling the antenna and a power cable can be passed through the antenna shaft, and the antenna shaft is further provided to prevent the antenna from falling. 6. The bending mechanism of a helicopter transmitter antenna shaft portion according to claim 1, wherein a wire cable can be passed through the bending mechanism of a helicopter transmitter antenna shaft portion.

The bending mechanism of the helicopter transmitter antenna shaft portion of the present invention is, as set forth in claim 1, an antenna lifting device for a transmitter antenna disposed vertically below the lower surface of the fuselage of a helicopter, wherein the antenna lifting device is connected to a transmitter. , an elevating device provided at the bottom of the transmitter, an antenna shaft having one end swingably attached to the elevating device, and an antenna provided at the other end of the antenna shaft, is provided with a bending mechanism that is arranged above the skid position of the helicopter when the antenna is deployed vertically downward and bends when a predetermined load is applied; This is a mechanism that grips both ends of a plate-shaped fuse plate that breaks when the helicopter transmitter antenna shaft breaks. This can prevent damage to the lifting device and the helicopter body due to impact.
Further, by making the bending part so that only the fuse plate can be broken, maintenance and replacement can be easily performed in the event of breakage, thereby reducing user maintenance costs and shortening the replacement work period.

Further, as in claim 2, the portion of the fuse plate to be gripped has a bulging gourd shape, so that it is easy to grip the fuse plate at both ends, and the constricted portion where the rupture occurs more clearly. This has the advantage of making visual confirmation easier during maintenance and inspection.

Further, as in claim 3, the fuse plate is characterized in that the portion that breaks is cylindrical, so that the stress load is uniformly applied to this portion because the portion that breaks is cylindrical. However, it is designed so that it will break under the specified load. It is also easy to visually check during maintenance and inspection.

Moreover, as in claim 4, the folding mechanism is configured to grip the fuse plate by disposing the fuse plate at a plurality of places evenly arranged on the circumference when viewed from above, so that the folding mechanism and the fuse plate can be made compact by distributing the load. In particular, when the bending mechanism is configured to grip the fuse plate by arranging the fuse plate at three equal positions on the circumference when viewed from above, the folding mechanism can grip the fuse plate in all directions. The fuse plate will break under a certain load, so even if you land without worrying about the direction of landing during an emergency landing, the breakage mechanism will work reliably, preventing the fuse plate from breaking and damaging the elevator and the helicopter body. be able to.

Further, as in claim 6, the antenna shaft has a hollow shape, a cable for controlling the antenna and a power cable can be passed through the antenna shaft, and a cable for preventing the antenna from falling is provided. It is characterized by a wire cable that can be routed through it, and is intended to prevent cable deterioration under the harsh operating environment of helicopters. In addition, the antenna has a more waterproof structure than the general method of connecting a cable from the outside and connecting it with a connector. In addition, a wire rope to prevent the antenna from falling is connected and fixed to the antenna, so even if the shaft breaks during flight, the structure will prevent the antenna from falling.

It is a figure of the antenna raising/lowering device of this invention, (a) is a left view, (b) is a top view, (c) is a bottom view, (d) is a front view, and (e) is a back view. FIG. 1 is a perspective view of an antenna elevating device of the present invention. 1A and 1B are schematic diagrams of the antenna elevating device of the present invention in a stowed state and an unfolded state; FIG. FIG. 4 is a diagram of the folding mechanism of the present invention, in which (a) is a front view, (b) is a top view, (c) is a side view, and (d) is two examples in which the fuse plate is in a folded state. It is a figure of the fuse plate of this invention, (a) is a front view, (b) is a top view, and (c) is a side view.

A first embodiment of a 3D lookup table circuit according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram of the antenna lifting device of the present invention, in which (a) is a left side view, (b) is a top view, (c) is a bottom view, (d) is a front view, and (e) is a rear view. 2 is a perspective view of the antenna elevating device of the present invention, and FIG. 3 is a schematic diagram of the elevating device in the antenna retracted state and the unfolded state of the antenna elevating device of the present invention, (a) is the retracted state, ( b) is a diagram of the unfolded state, FIG. 4 is a diagram of the folding mechanism of the invention, (a) is a front view, (b) is a top view, (c) is a side view, and (d) is a diagram of the fuse plate. FIG. 5 shows two examples of the fuse plate of the present invention in a folded state, in which (a) is a front view, (b) is a plan view, and (c) is a side view.

As shown in FIG. 1, the antenna lifting device 100 of the present invention mainly includes a transmitter 10 attached to the lower surface of the aircraft body, a lifting device 20 provided at the bottom of the transmitter 10, and one end of the lifting device 20 is swingable. and an antenna 50 provided at the other end of the antenna shaft 40. A bending mechanism 30 is provided at the top and bends when a predetermined load is applied, and the bending mechanism 30 is a mechanism that grips both ends of a plate-shaped fuse plate 31 that breaks when a predetermined load is applied.

The transmitter 10 has a built-in FPU and the like necessary for transmission. In this embodiment, the size of the transmitter 10 is approximately 230 mm in width, approximately 410 mm in depth, and approximately 95 mm in height, making it extremely compact.

The elevating device 20 is equipped with an actuator 21 for swinging the antenna between a storage state, which is a substantially horizontal state, and a deployed state, which is a substantially vertical state. The operation of the actuator 21 is as shown in FIG. 3, with the rod of the actuator 21 in the retracted state as shown in FIG. 3(a), and the expanded state as shown in FIG. 3(b). The structure is as follows.

The antenna shaft 40 has a hollow cylindrical shape, and has a structure in which one end is connected to the actuator 21 of the lifting device, and the other end is attached to the antenna 50. A cable for controlling an antenna section (not shown) and a power cable are routed through the antenna shaft 40. The purpose is to prevent cable deterioration under the harsh operating environment of helicopters. In addition, the antenna 50 has a more waterproof structure than the general method in which a cable is routed from the outside and connected to a connector. Further, although not shown, a wire rope to prevent the antenna 50 from falling is passed through and fixed to the antenna 50, so that even if the shaft breaks during flight, the structure will prevent the antenna 50 from falling. There is.

As shown in FIG. 4, the bending mechanism 30 is arranged in such a manner that a shaft divided into two parts is connected to a part of the antenna shaft 40, and the gripping part 32 is vertically symmetrical as shown in FIG. 4(b). It has a structure in which both ends of the fuse plate 31 are held using bolts and nuts, respectively. In this embodiment, the gripping portions 31 are arranged at three equal locations on the circumference of the antenna shaft 40 as shown in FIG. 4(a), and the fuse plate 31 breaks under a constant load in all directions. Even if you land without worrying about the landing direction during an emergency landing, the folding mechanism will work reliably, preventing the fuse plate from breaking and damaging the lifting gear and the helicopter body.

The shape of the fuse plate 31 of the folding mechanism 30 is as shown in FIG. 5, and is formed of a constricted part 31a which is the part to be broken, and a plate-shaped grip part 31b for gripping, and the grip part 31b is shaped like a swollen gourd. It has a shape.

Furthermore, in this embodiment, the constriction 31a is formed in a cylindrical shape as shown in the figure, and when a predetermined load is applied, cracks start to appear from the constriction 31a at the center of FIG. 4(d), it is completely broken. Since the constricted portion 31a has a cylindrical shape, the stress load is evenly applied to this portion, and the constriction is devised so that it will break under the preset load from any direction. It is also easy to visually check during maintenance and inspection.

The fuse plate 31 has a shape that takes stress concentration load into consideration in advanced analysis design, and is designed with material, shape, and thickness so that it will not break under wind pressure loads during flight operation and will easily break during emergency landing. In particular, the thickness is determined by the shape and weight of the antenna, the cruising speed of the helicopter, etc., and has the advantage of being versatile enough to be applied to various specifications.

The present invention relates to a bending mechanism for a helicopter transmitter antenna shaft portion, but the bending mechanism can be applied not only to antennas but also to equipment that may obstruct an emergency landing of a helicopter.

100 Antenna lifting device 10 Transmitter 20 Lifting device 21 Actuator 30 Bending mechanism 31 Fuse plate 31a Narrow portion 31b Grip portion 32 Grip portion 40 Antenna shaft 50 Antenna

Claims (6)

In the antenna lifting device for the transmitter antenna located vertically below the underside of the helicopter fuselage,
The antenna lifting device includes a transmitter, a lifting device provided below the transmitter, an antenna shaft having one end swingably attached to the lifting device, and an antenna provided at the other end of the antenna shaft. , consists of
The antenna shaft is provided with a bending mechanism that is arranged at a position above the skid position of the helicopter when the antenna is deployed vertically downward and bends when a predetermined load is applied;
The bending mechanism is a mechanism that grips both ends of a plate-shaped fuse plate that breaks when a predetermined load is applied;
A folding mechanism for the antenna shaft of a helicopter transmitter. 2. The folding mechanism for a helicopter transmitter antenna shaft portion according to claim 1, wherein a plate-like gripping portion for gripping the fuse plate has a swollen gourd shape. The bending mechanism for a helicopter transmitter antenna shaft portion according to claim 1 or 2, wherein the fuse plate has a cylindrical portion at which the fuse plate breaks. The helicopter transmitter antenna shaft according to any one of claims 1 to 3, wherein the bending mechanism is configured to grip the fuse plate by equally disposing the fuse plate at a plurality of positions on a circumference when viewed from above. folding mechanism. 5. The folding mechanism for a helicopter transmitter antenna shaft portion according to claim 4, wherein the folding mechanism grips the fuse plate by disposing the fuse plate at three equally spaced positions on a circumference when viewed from above. The antenna shaft has a hollow shape, and a cable for controlling the antenna and a power cable can be passed through the antenna shaft, and a wire cable for preventing the antenna from falling can be passed through the antenna shaft. The folding mechanism of a helicopter transmitter antenna shaft portion according to any one of claims 1 to 5, characterized in that:

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