JP6494717B1 - Propeller guard - Google Patents

Abstract

An object of the present invention is to provide a propeller guard capable of suppressing the falling of an aircraft that collides with an object during flight.
In a propeller guard (10) mounted on an aircraft flying by thrust generated by rotation of a plurality of propellers having vertical rotation axes, an area in which the aircraft is disposed is partitioned and a flight is performed in this area The propeller guard frame 20 is disposed outside the rotating tip of each propeller of the flight body when the body is placed, and the propeller guard frame is a center of thrust of the flight body when the flight body is disposed in the area. And the lower frame 25 opposed to the upper frame below the upper frame, and the area of the imaginary plane surrounded by the outer edge of the lower frame is the outside of the upper frame It is set smaller than the area of the virtual plane surrounded by the edge.
[Selected figure] Figure 1

Description

  The present invention relates to a propeller guard, and more particularly to a propeller guard mounted on an aircraft flying by thrust generated by rotation of a plurality of propellers having vertical rotation axes.

  In the case of observing an object from a high place or aerially photographing the ground from above, in recent years, a flying object such as a so-called drone or multicopter flying by rotating a plurality of propellers may be used. Patent Document 1 discloses an aircraft equipped with a photographing means for photographing a surveillance area from the sky.

  If such a flying object collides with an object during flight, the propeller that collides with the object may be broken and the flying object may crash. May be worn.

  FIG. 8 is a view for explaining an outline of a propeller guard attached to a flying object. As illustrated, the propeller guard 100 is formed in a substantially rectangular shape in a plan view, and a plurality of bar-like connections for connecting the upper frame 101 and the lower frame 102 arranged in the upper and lower direction, and the upper frame 101 and the lower frame 102. It is formed to have a member 103.

  The flying object 110 is disposed in an area S divided by the upper frame 101, the lower frame 102, and the connecting member 103. The flying object 110 includes a main body 111 and four propellers 112 disposed in the main body 111.

  The flying object 110 is connected to the propeller guard 100 via a plurality of support members 104. Thus, the propeller 110 is attached to the flying object 110 by connecting the flying object 110 to the propeller guard 100.

JP, 2014-177162, A

  By the way, as shown in FIG. 9 (a), as shown in FIG. 9 (b), the flying object 110 flying in the traveling direction F indicated by the arrow F in the state where the propeller guard 100 is mounted is advanced. Suppose that it collides with the object 120 on the front side in the direction F.

  When the flying object 110 collides with the object 120, as shown in FIG. 9C, the thrust generated in the advancing direction F of the flying object 110 and the arrow generated by the rotation of the propeller 112 on the rear side of the advancing direction F of the flying object 110. The thrust in the upward direction indicated by the line U acts, and with the outer edge on the front side of the advancing direction F of the upper frame 101 as a fulcrum, A rotating moment M to rotate acts.

  As a result, as shown in FIG. 9 (d), when the upper frame 101 of the propeller guard 100 collides with the object 120 by the rotation of the flying object 100, the flying object 110 loses its flight balance and becomes uncontrollable, It is feared to fall along the object 120 in the vertical direction Y.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a propeller guard that can suppress the falling of a flying object that has collided with an object during flight.

  A propeller guard according to the present invention for achieving the above object is a propeller guard mounted on an aircraft flying by thrust generated by rotation of a plurality of propellers having vertical rotation axes, the aircraft being disposed And a propeller guard frame is disposed outside with respect to the rotating tips of the propellers of the flight vehicle when the aircraft is placed in the region, and the propeller guard frame places the aircraft in the region. Of an imaginary plane surrounded by the outer edge of the lower frame, and has an upper frame located above the center of thrust of the flying object and a lower frame facing the upper frame below the upper frame, It is characterized in that the area is set smaller than the area of the imaginary plane surrounded by the outer edge of the upper frame.

  According to this propeller guard, when the aircraft is disposed in the area of the propeller guard frame and mounted on the aircraft, the propeller guard frame is disposed outside the rotational tip of each propeller of the aircraft, and the upper frame is in flight The upper frame is located above the center of thrust of the body, and the lower frame is located below the upper frame and opposed to the upper frame.

  At this time, the area of the virtual plane surrounded by the outer edge of the lower frame is set smaller than the area of the virtual plane surrounded by the outer edge of the upper frame, so In the case of the horizontal direction, the position of the outer edge of the lower frame is a position retracted relative to the outer edge of the upper frame with respect to the traveling direction of the aircraft.

  Therefore, when the flying object collides with the object at the outer edge of the upper frame of the propeller guard frame, due to the action of the rotational moment generated at that time, the flying object contacts the object at the outer edge of the lower frame of the propeller guard frame. collide.

  As a result, the reaction force received from the object changes the traveling direction of the flying object in the moving direction away from the object, so that the flying object does not lose flight balance and become uncontrollable. Therefore, even if the flight vehicle collides with an object during flight, the flight vehicle is suppressed from falling.

  A propeller guard according to the present invention for achieving the above-described object has a mounting portion disposed vertically below an aircraft flying by thrust generated by rotation of a plurality of propellers having vertical rotation axes. In a propeller guard mounted on an aircraft, a propeller guard frame that defines an area in which the aircraft is disposed, and is disposed outward with respect to the rotating tip of each propeller of the aircraft when the aircraft is disposed in the area And the propeller guard frame has an upper frame located above the thrust center of the aircraft when the aircraft is placed in the area, and a lower frame facing the upper frame below the upper frame. And the area of the virtual plane surrounded by the outer edge of the lower frame is set smaller than the area of the virtual plane surrounded by the outer edge of the upper frame. The features.

  As described above, since the propeller guard can be mounted even if the mounting portion is vertically disposed, the flying body loses its flight balance even with such a flying body. It can not be out of control. Therefore, even if the flight vehicle collides with an object during flight, the flight vehicle is suppressed from falling.

  In particular, when the lower frame of this propeller guard projects the trajectory of the rotating tip of each propeller on a virtual plane surrounded by the outer edge of the lower frame, the trajectory of the rotating tip of each propeller and the outer edge of the lower frame And are formed so as to overlap in part.

  Therefore, since the rotational moment generated when the flying object collides with the object at the outer edge of the upper frame of the propeller guard frame can be made relatively large acting between the upper frame and the lower frame, The reaction force received from the object is increased. Thereby, the traveling direction of the flying object is more appropriately changed in the direction away from the object.

  Furthermore, the propeller guard frame of the propeller guard is characterized in that the outer edge of the upper frame and the outer edge of the lower frame are connected by a plurality of connecting members. Therefore, the propeller guard frame can be easily formed by connecting the outer edge of the upper frame and the outer edge of the lower frame with the connecting frame.

  Moreover, the propeller guard frame of the propeller guard is characterized in that the upper frame and the lower frame are each formed in a substantially rectangular shape in a plan view. Therefore, when the flying object collides with the object, the acting force on the propeller guard frame is likely to act.

  According to the present invention, even if the flight vehicle collides with an object during flight, the flight vehicle is prevented from losing flight balance and becoming uncontrollable, so that the flight vehicle is prevented from falling.

It is a top view explaining the outline of the propeller guard concerning an embodiment of the invention. Similarly, it is a side view explaining an outline of a propeller guard concerning this embodiment. Similarly, it is a perspective view explaining the outline of the propeller guard concerning this embodiment. Similarly, it is a figure explaining an outline in case a propeller guard concerning this embodiment is equipped with a flight object by which a mounting part was arranged in the perpendicular direction. Similarly, in the state where the propeller guard according to the present embodiment is attached to a flying object, it is a view for explaining an outline when the flying object collides with an object while the flying object is flying. It is a figure explaining the outline of the propeller guard concerning other embodiments. It is a figure explaining an outline of a flight object with which a propeller guard concerning this embodiment is equipped. It is a figure explaining the outline of the conventional propeller guard with which a flight body is equipped. It is a figure explaining the outline of the fault which may occur when the conventional propeller guard is attached to a flight object.

  Next, a propeller guard according to an embodiment of the present invention will be described.

  Prior to the description of the propeller guard according to the present embodiment, an outline of a drone, which is a flying object on which the propeller guard is mounted, will be described with reference to FIG.

  As illustrated, the drone 1 includes a main unit 2 in which a flight controller for controlling the drone 1 is stored, and four propellers 3 provided in the main unit 2 and having a vertical rotation axis indicated by an arrow V. Prepare as the main configuration.

  In the present embodiment, each propeller 3 includes two blades having a rotating tip 3a, and the thrust generated by the rotation of each propeller 3 causes the drone 1 to fly and fly.

  The propeller guard according to the present embodiment is mounted on such a drone 1 and aims to protect an object from colliding with each propeller 3 during the flight of the drone 1.

  FIG. 1 is a plan view for explaining the outline of a propeller guard according to the present embodiment, FIG. 2 is a side view for explaining the outline of the propeller guard, and FIG. 3 is a perspective view for explaining the outline of the propeller guard. is there.

  As illustrated, the propeller guard 10 includes a propeller guard frame 20 mounted on the drone 1 and a support member 30 connecting the propeller guard frame 20 and the drone 1.

  The propeller guard frame 20 includes an upper frame 21, a lower frame 25, and a connecting frame 28 which is a plurality of connecting members connecting the upper frame 21 and the lower frame 25.

  In the present embodiment, the upper frame 21 is formed in a substantially rectangular shape in a plan view by a rod made of resin. The outer edge 21a of the upper frame 21 is formed by the bar, and the first virtual surface P1 is set in a plane area surrounded by the outer edge 21a.

  The lower frame 25 is formed in a substantially rectangular shape in a plan view by a rod made of resin in the present embodiment. The outer edge 25a of the lower frame 25 is formed by this bar, and the second virtual surface P2 is set in the plane area surrounded by the outer edge 25a.

  The area of the second virtual surface P2 surrounded by the outer edge 25a of the lower frame 25 is the area of the first virtual surface P1 surrounded by the outer edge 21a of the upper frame 21 in the present embodiment. Small (P1> P2).

  The connection frame 28 is formed of a plurality of resin-made rods in the present embodiment. The connecting frame 28 is disposed so as to incline inward as it goes from the upper frame 21 to the lower frame 25 in a state where the lower frame 25 is disposed below the upper frame 21 so as to face the upper frame 21. The outer edge 21 a of the upper frame 21 and the outer edge 25 a of the lower frame 25 are connected via the connecting frame 28.

  Thus, the upper frame 21 and the lower frame 25 are connected by the connecting frame 28, and the propeller guard frame 20 in which the area S is divided by the upper frame 21, the lower frame 25 and the connecting frame 28 is formed. The drone 1 is placed on the

  In the present embodiment, the support member 30 is formed of four rods made of resin, and connects the propeller guard frame 20 and the drone 1 in a state where the drone 1 is disposed in the region S of the propeller guard frame 20. Do.

  When the drone 1 is disposed in the region S and the propeller guard frame 20 is connected to the drone 1 by the support member 30 and the propeller guard 10 is attached to the drone 1, the propeller guard frame 20 can be used for each propeller 3 of the drone 1. Is disposed on the outside of the rotary tip 3a.

  At this time, the upper frame 21 of the propeller guard frame 20 is positioned above the thrust center W of the drone 1.

  On the other hand, the lower frame 25 of the propeller guard frame 20 projects a rotation locus r, which is the locus of the rotation tip 3a of each propeller 3 of the drone 1, onto the second virtual plane P2 surrounded by the outer edge 25a of the lower frame 25 Then, the rotation trajectory r and the outer edge 25a of the lower frame 25 are formed so as to partially overlap.

  The propeller guard 10 thus formed is, as shown in FIG. 4, a drone 1 in which a mounting portion 4 on which a camera or the like is mounted is disposed on the main body portion 2 in the vertical direction of the drone 1 indicated by arrow Y. It can also be worn on

  At this time, in the present embodiment, the propeller guard 10 is mounted on the drone 1 in a state where the mounting portion 4 protrudes from the lower frame 25 of the propeller guard frame 20.

  Next, an outline of the case where the drone 1 collides with an object when the drone 1 is flying with the propeller guard 10 attached to the drone 1 will be described. As shown in FIG. 5 (a), the drone 1 flying in the traveling direction indicated by the arrow F1 in the mounted state of the propeller guard 10 is, as shown in FIG. 5 (b), the propeller guard frame 20. It is assumed that an object 120 collides with the front outer edge 21 a of the upper frame 21 in the traveling direction F1.

  When the drone 10 collides with the object 120, as shown in FIG. 5C, the forward end F1 of the upper frame 21 takes the front end outer edge 21a as a fulcrum by the action of the thrust toward the advancing direction F1 of the drone 1. On the rear side of the traveling direction F1 of the drone 1, a rotational moment M which causes the drone 1 to rotate downward acts.

  Due to this rotational moment M, the drone 1 collides with the object 120 at the outer edge 25 a on the front side in the traveling direction F 1 of the lower frame 25 of the propeller guard frame 20.

  When the drone 1 collides with the object 120 at the outer edge 25a on the front side in the traveling direction F1 of the lower frame 25 of the propeller guard frame 20, it receives from the object 120 indicated by the arrow R as shown in FIG. By the reaction force, the traveling direction of the drone 1 is changed to the traveling direction away from the object indicated by the arrow F2.

  After the dredging, the drone 1 will fly in the traveling direction F2 away from the object 120.

  As described above, when the propeller guard 10 according to the present embodiment is disposed in the region S of the propeller guard frame 20 and the drone 1 is mounted on the drone 1, the propeller guard frame 20 rotates the propellers 3 of the drone 1. The upper frame 21 is located on the outside of the tip 3 a, and the upper frame 21 is positioned above the thrust center W of the drone 1.

  At this time, the area of the second virtual surface P2 surrounded by the outer edge 25a of the lower frame 25 is set smaller than the area of the first virtual surface P1 surrounded by the outer edge 21a of the upper frame 21. Therefore, when the direction of travel of the drone 1 is horizontal, the position of the outer edge 25a of the lower frame 25 is a position retracted relative to the outer edge 21a of the upper frame 21 with respect to the direction of travel of the drone 1. It becomes.

  Therefore, when the drone 1 on which the propeller guard 10 is mounted collides with the object 120 at the outer edge 21a on the front side of the traveling direction F1 of the upper frame 21 of the propeller guard frame 20, the rotation moment M generated at that time The drone 1 collides with the object 120 at the outer edge 25a on the front side in the traveling direction F1 of the lower frame 25 of the propeller guard frame 20.

  As a result, since the traveling direction of the drone 1 is changed to the traveling direction F2 separating from the object by the reaction force received from the object 120, the drone 1 does not lose flight balance and become uncontrollable. Therefore, even if the drone 1 collides with the object 120 during flight, the drone 1 is prevented from falling.

  Furthermore, in the present embodiment, when the rotation trajectory r, which is the trajectory of the rotation tip 3a of each propeller 3 of the drone 1, is projected onto the second virtual plane P2, the rotation trajectory r and the lower frame 25 The outer edge 25a is formed so as to overlap in part.

  Therefore, the rotational moment M generated when the drone 1 collides with the object 120 at the outer edge 21a on the front side in the traveling direction F1 of the upper frame 21 of the propeller guard frame 20 is represented by the upper frame 21 and the lower frame 25. The reaction force that the drone 1 receives from the object 120 is increased because it is possible to act relatively largely between the two.

  As a result, the traveling direction of the drone is more appropriately changed in the direction away from the object 120.

  In addition, the propeller guard frame 20 can be easily formed by connecting the outer edge 21 a of the upper frame 21 and the outer edge 25 a of the lower frame 25 with the connecting frame 28.

  Furthermore, since the upper frame 21 and the lower frame 25 of the propeller guard frame 20 are respectively formed in a substantially rectangular shape in a plan view, the acting force on the propeller guard frame 20 acts when the drone 1 collides with the object 120. It becomes easy to do.

  Specifically, at the outer edge 21a on the front side of the traveling direction F1 of the upper frame 21 of the propeller guard frame 20, a rotational moment M generated when the drone 1 collides with the object 120 is likely to act and drone The reaction force received from the object 120 tends to act when the first collision of the object 120 with the object 120 occurs at the front outer edge 25a of the lower frame 25 of the propeller guard frame 20 in the traveling direction F1.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. In the above embodiment, when the rotation trajectory r, which is the trajectory of the rotation tip 3a of each propeller 3 of the drone 1, is projected onto the second virtual surface P2, the rotation trajectory r and the outer end of the lower frame 25 Although the case where the edge 25a is formed to overlap in part is described, the outer edge 25a of the lower frame 25 is not limited to this form.

  For example, as shown in FIG. 6, when the propeller guard 10 is attached to the drone 1, the lower rotation axis V of each propeller 3 of the drone 1 passes the outer edge 26a of the lower frame 26. A frame 26 may be formed.

  Thereby, the rotational moment M generated when the drone 1 collides with the object 120 can be made to act more greatly between the upper frame 21 and the lower frame 26.

1 Drone (Aircraft)
Reference Signs List 3 propeller 3a rotating tip 10 propeller guard 20 propeller guard frame 21 upper frame 21a outer edge 25, 26 lower frame 25a, 26a outer edge 28 connecting frame (connection member)
30 support member P1 first virtual surface P2 second virtual surface S area V rotation axis

Claims (3)

In a propeller guard mounted on an aircraft flying by thrust generated by rotation of a plurality of propellers having a vertical rotation axis,
And a propeller guard frame disposed outside the rotating tips of the propellers of the flight body when the flight body is disposed in the area, and demarcating an area in which the flight body is disposed;
The propeller guard frame is
An upper frame positioned above a center of thrust of the aircraft when the aircraft is placed in the area;
A lower frame opposed to the upper frame below the upper frame;
The upper frame and the lower frame are each formed in a substantially rectangular shape in plan view,
The outer edge of the upper frame and the outer edge of the lower frame are connected by a plurality of connecting members, and the corner of the upper frame and the corner of the lower frame of the connecting member are connected. The connection member is connected to a support member on which the propeller is mounted when the flight body is disposed in the area.
When an aircraft equipped with the propeller guard collides with an object, the lower frame collides with the object after the upper frame collides with the object, and the aircraft receives a reaction force from the object to cause the collision. The area of the virtual plane surrounded by the outer edge of the lower frame is set smaller than the area of the virtual plane surrounded by the outer edge of the upper frame so as to fly away from the object. Propeller guard that is characterized. A propeller guard mounted on a flying body in a state in which a mounting portion is disposed vertically below a flying body by a thrust generated by rotation of a plurality of propellers having a vertical rotation axis,
And a propeller guard frame disposed outside the rotating tips of the propellers of the flight body when the flight body is disposed in the area, and demarcating an area in which the flight body is disposed;
The propeller guard frame is
An upper frame positioned above a center of thrust of the aircraft when the aircraft is placed in the area;
A lower frame facing the upper frame below the upper frame;
The upper frame and the lower frame are each formed in a substantially rectangular shape in plan view,
The outer edge of the upper frame and the outer edge of the lower frame are connected by a plurality of connecting members, and the corner of the upper frame and the corner of the lower frame of the connecting member are connected. The connection member is connected to a support member on which the propeller is mounted when the flight body is disposed in the area.
When an aircraft equipped with the propeller guard collides with an object, the lower frame collides with the object after the upper frame collides with the object, and the aircraft receives a reaction force from the object to cause the collision. The area of the virtual plane surrounded by the outer edge of the lower frame is set smaller than the area of the virtual plane surrounded by the outer edge of the upper frame so as to fly away from the object. Propeller guard that is characterized. The lower frame is
When the locus of the rotating tip of each propeller is projected on the virtual plane surrounded by the outer edge of the lower frame, the locus of the rotating tip of each propeller is at the outer edge of the lower frame The propeller guard according to claim 1, wherein the propeller guard is formed to be in contact with each other.

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