JP2933274B1 - Flap drive for rotor blades - Google Patents

Abstract

A rotor blade flap driving device having a small size and sufficient driving force is provided. SOLUTION: A flap driving blade 3 is provided at the tip of a blade 2 of a rotor blade such as a helicopter. A torsional actuator 9 is provided in the blade 2, and the torsional torque generated by the torsional actuator 9 is transmitted to the flap driving blade 3 via the shaft 6 to displace the angle of attack α of the flap driving blade 3. A flap 4 is attached to the trailing edge of the blade 2 so as to be angularly displaceable. The flap 4 is connected to a flap drive blade 3 via a transmission lever 5. When the angle of attack α of the flap driving blade 3 is displaced, pneumatic force is generated and the flap driving blade 3 is displaced up and down. This displacement drives the flap 4 via the transmission lever 5 to perform angular displacement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor blade flap driving device for driving a flap provided at a trailing edge of a rotor blade such as a helicopter.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for commuter helicopters that take off and land at helipads in urban areas, and a reduction in noise is required for realization. As one of the effective measures against the noise, a method of improving the aerodynamic characteristics of the rotor blade by attaching a flap to the rotor blade of the helicopter and finely controlling the flap angle has been considered.

[0003]

Since such a flap driving device needs to be housed in a blade, it is small and requires a sufficient driving force to drive the flap. In order to satisfy such demands, for example, a smart material actuator using a piezo element or a magnetostrictive element is considered as an actuator used in the flap driving device. However, it is difficult to directly drive the flap because the displacement of the smart material actuator is small and it is difficult to obtain a sufficient driving force.

It is an object of the present invention to provide a rotor blade flap drive device which is small and has sufficient driving force.

[0005]

SUMMARY OF THE INVENTION The present invention provides a flap which is attached to a trailing edge side of a blade so as to be freely displaceable, a flap drive blade which is provided at a tip end of the blade so as to be able to be freely displaced in angle of attack, and a flap drive blade. A flap driving device for a rotor blade, comprising: an actuator for angularly displacing an angle; and driving the flap by pneumatic force generated in the flap driving blade.

According to the present invention, the flap driving blade provided at the tip of the blade is provided so as to be capable of changing the angle of attack. For example, when the angle of attack is changed in the positive direction, the air force pulling up the flap driving blade upwards. When this occurs and the angle of attack is displaced in the negative direction, an aerodynamic force is generated that pulls the flap drive blade downward.

The flap provided at the trailing edge of the rotor blade is driven by the aerodynamic force generated in the flap driving blade. Since the angle of attack of the flap driving blade is angularly displaced by the actuator, the flap of the rotor blade can be driven only by displacing the angle of attack of the flap driving blade by the actuator. Therefore,
Even with an actuator having a small driving force and a small displacement, the flap can be sufficiently driven.

Further, the present invention is characterized in that it comprises a transmission lever which is supported so as to be freely angularly displaceable and which allows the flap driving blade and the flap to interlock.

According to the present invention, when the flap driving blade is vertically displaced, for example, by the air force generated in the flap driving blade, the flap is driven to be angularly displaced in conjunction with the transmission lever which is supported to be angularly displaceable. become. With such a simple configuration, the angular displacement of the flap of the rotor blade can be reliably performed.

Further, the present invention is characterized in that an enlargement transmission mechanism for driving the flap by enlarging the angular displacement of the transmission lever is provided.

According to the present invention, the transmission lever, which is angularly displaced by the displacement of the flap driving blades, has its angular displacement expanded by the expansion transmission mechanism, and the expanded angular displacement drives the flap to angularly displace. Therefore, even if the displacement of the flap driving blade is minute, the flap can be largely angularly displaced.

The present invention also provides blade control means for outputting a blade control signal corresponding to a target blade pitch angle and an angle of attack target signal corresponding to a target angle of attack of a flap driving blade. Calculating means for calculating a signal following the attack angle target signal based on the signal and the blade control signal, and outputting the signal as a command signal to an actuator of the flap driving blade.

According to the present invention, in a rotor blade such as a helicopter, the pitch angle, which is the angle of attack of the blade, is displaced in accordance with the rotation of the rotor, and the pitch angle of the blade is determined by the blade control signal output from the blade control means. Is controlled by Further, the angle of attack of the flap driving blade is controlled by an angle of attack target signal corresponding to the target angle of attack regardless of the pitch angle of the blade. Since the flap driving wing is provided at the tip of the blade, the angle of attack is also displaced in accordance with the pitch angle of the blade. In the present invention, a command signal is output to the actuator so as to follow the angle of attack target signal. Therefore, the angle of attack of the flap can always be controlled to the target angle of attack regardless of the pitch angle of the blade. In this way, the pitch angle of the blade is canceled and the flap drive control can always be performed accurately.

[0014]

FIG. 1 is a perspective view showing a rotor blade flap drive device 1 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. The flap driving device 1 is provided on a rotor blade of a helicopter, and drives a flap 4 that is attached to the trailing edge of the tip of the blade 2 so as to be angularly displaceable.

The blade 2 is made of FRP (fiberglass reinfor).
It is formed hollow from composite materials such as ced plastics). A notch 10 is formed at the tip rear edge of the blade 2 so as to extend along the span direction, and a rear edge side of the notch 10 functions as the flap 4. Further, since the direction of the reinforcing fibers of the composite material forming the blade 2 is arranged along the span direction, the portion whose thickness is reduced by the notch 10 functions as the hinge 11 of the flap 4.

A transmission lever 5 is fixed to one end 4a of the flap 4 on the tip side of the blade 2, and the other end 4b is cut away from the blade 2. The tip of the blade 2 is cut out so that the transmission lever 5 can be fitted therein, and the recess 7 is formed.
Is formed. One end 5a of the transmission lever 5 and one end 4a of the flap 4 are mutually fixed and integrally formed,
When the transmission lever 5 swings, the flap 4 becomes the hinge axis of the hinge 11 and the angular displacement axis L1 of the flap 4
It will be angularly displaced around.

A flap driving blade 3 is provided at the other end 5b of the transmission lever 5 in the longitudinal direction. The flap driving blade 3 is a small blade having a short span, and a shaft 6 projecting in the span direction.
By angular displacement about the axis of the shaft 6,
The angle of attack α of the flap driving blade 3 is displaced. The angle of attack α is an angle made with respect to the flow of air with respect to the flap driving wing 3. When the flap driving blade 3 is parallel to the air flow, the angle of attack α is 0 °. The angle of attack α is positive, and the angle of attack α becomes negative when the angular displacement is downward. Such a flap drive wing is a non-warped symmetric wing, for example NACA 0012 or NACA 0015.

The other end 5b of the transmission lever 5 supports the shaft 6 via a bearing 12, and the concave portion 7 in which the transmission lever 5 is fitted is vertically moved in the circumferential direction around the angular displacement axis L1 of the flap 4. An elongated hole 8 is formed, and the shaft 6 of the flap driving blade 3 is formed.
Is inserted. The shaft 6 of the flap driving blade 3 is preferably provided at the center of the wind pressure of the blade 2, and is provided at a position 25% from the leading edge with respect to the chord length W 1 of the blade 2 in this embodiment.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a plan view of the flap driving device 1. A torsional actuator 9 disposed along the span direction is provided in the blade 2, and the shaft 6 of the flap driving blade 3 is attached to one end 9 a of the torsional actuator 9.
The torsion actuator 9 is coaxially fixed to the torsion axis L2.

A linear guide 13 is provided at the other end 9b of the torsion actuator 9. The linear guide 13 supports the other end 9b of the torsion actuator 9 such that the torsion actuator 9 can be displaced vertically in the thickness direction of the blade 2 while restraining the torsion of the torsion actuator 9 around the torsion axis L2.

As the torsion actuator 9, a small and lightweight smart material actuator composed of a piezo element or a magnetostrictive element that generates a torsional moment in response to an electric signal is used, for example, a piezo element. In the present embodiment, in order to increase the amount of displacement of the piezo element, for example, a plurality of plate-shaped piezo elements that expand or contract according to an applied voltage are provided on one side of a substrate disposed along the torsion axis L2. It is configured such that it is attached to the surface so as to intersect at + 45 ° with the torsion axis L2, and to the other surface so as to intersect at −45 °. Further, such a plate-shaped torsional actuator may be configured to cross in a cross around the torsion axis L2.

When a drive voltage is applied to the torsion actuator 9, the torsion actuator 9 turns torsion axis L 2
Twisted around, the angle of attack α of the drive blade 3 is displaced. When the angle of attack α of the flap driving blade 3 is displaced in the positive direction, pneumatic force is generated so as to pull the flap driving blade upward, and the flap driving blade 3 is rapidly displaced upward, and the shaft 6 is connected to the slot 8. Upper end 8a
And the flap driving blade 3 is positioned at the upper limit position. At this time, the transmission lever 5 that supports the shaft 6 so that it can be angularly displaced
Is displaced upward, and the flap 4 is angularly displaced downward about the angular displacement axis L1. Since the other end 9b of the torsion actuator 9 is supported by the linear guide 13 so as to be vertically displaceable, it is displaced upward following the upward displacement of the flap driving blade 3.

Conversely, when the angle of attack α of the flap driving blade 3 is displaced in the negative direction, an aerodynamic force is generated so as to pull the flap driving blade 3 downward, and the flap driving blade 3 is connected to the lower end of the slot 8. 8b is rapidly displaced downward to the lower limit position where it abuts,
The flap 4 is angularly displaced upward through the transmission lever 5.

As described above, even with the torsional actuator 9 having a small driving force, the flap 4 can be displaced at a high speed by utilizing the aerodynamic force generated in the flap driving blades 3, and the response is good. Further, since the wings are symmetrical, the angular displacement of the angle of attack α in the positive and negative directions is equal to the aerodynamic force generated at that time, and control is easy.

Further, since the flap driving blade 3 is a symmetrical wing, the torque for displacing the angle of attack α is extremely small and almost zero.
The driving force of the flap 4 is a very large moment obtained by multiplying the distance W2 between the axis 6 of the driving blade 3 and the angular displacement axis L1 of the flap 4 by the aerodynamic force generated in the flap driving blade 3. As described above, the small and lightweight torsional actuator 9 having a small force provided inside the blade 2 has:
The flap 4 can be driven with a large force.

Further, a spring may be provided so that the angle of attack of the flap driving blade 3 becomes 0 ° when no voltage is applied to the torsional actuator 9. When the spring is provided in this manner, the movement of the flap driving blade 3 can be moderated.

FIG. 5 is a sectional view showing the flap driving device 1 using the hinges 20 and 21, and FIG. The torsion actuator 9 of the flap driving device 1 is a linear guide 1 as shown in FIGS.
5, both ends 9 a and 9 b of the torsion actuator 9 are hinged with the flap drive blade 3 and the blade 2 by the hinges 20 and 21 as shown in FIG. 5.
You may be comprised so that it may be connected.

The hinge 20 connecting the shaft 6 of the flap driving blade 3 and one end 9a of the torsion actuator 9 is a long rod-shaped member having an H-shaped cross section, and is arranged along the chord direction of the blade 2. And a composite material in which the direction of the reinforcing fibers is the longitudinal direction. One end of the hinge 20 in the width direction is fixed to the shaft 6 of the flap driving blade 3, and the other end in the width direction is fixed to one end 9 a of the torsion actuator 9. Therefore, the torsional actuator 9 and the flap drive blade 6 can be angularly displaced about the hinge 20 extending in the chord direction, and the torsional axis L of the torsional actuator 9 can be changed.
2 can be reliably transmitted to the flap drive blade 3.

The other end 9b of the torsion actuator 9 is connected to the blade 2 via a hinge 21 made of a composite material and a mounting member 26, similarly to the hinge 20 described above. Therefore, the torsional actuator 9 can be angularly displaced about the hinge 21 at the other end 9b, and is connected to the blade 2 in a state where the displacement of the torsional actuator 9 around the torsional axis L2 is restricted.

Therefore, the vertical displacement of the flap driving blade 3 is allowed, and the torsional axis
The surrounding torsional torque can be reliably transmitted to the shaft 6 of the flap drive blade 3. Further, the angular displacement range θ1 of the torsional actuator 9 when the flap driving blade 3 is at the upper limit position and at the lower limit position is selected to be, for example, about 1 to 2 °.

Instead of the hinge 20 made of a composite material for connecting the torsion actuator 9 and the shaft 6, a hinge 20a shown in FIG. 7 may be used. Similarly, a hinge may be used instead of the hinge 21 made of a composite material.

The hinge of the flap 4 of the flap driving device 1 is not limited to the hinge 11 made of a composite material as shown in FIGS. 1 to 4, but may be a hinge 23 as shown in FIG. The hinge 23 has a hinge shaft 24 coaxial with the angular displacement axis L1 of the flap inserted through a shaft insertion hole 25 formed in the blade 2, and the flap 4 is attached so as to be angularly displaceable about the angular displacement axis L1. Even the flap 4 including the hinge 23 is effectively driven to be angularly displaced by the aerodynamic force of the flap driving blade 3.

FIG. 9 is a perspective view showing a flap driving device 30 according to another embodiment of the present invention, FIG. 10 is a perspective view of the flap driving device 30 with the blade 2 cut away, and FIG. FIG. 9 is a sectional view taken along section line XI-XI of FIG. 9. The flap driving device 1 shown in FIGS.
Are given the same reference numerals. The flap drive device 30 is similar to the flap drive device 1, and it should be noted that a frame lever 31 is provided in the blade 2 instead of the transmission lever 5 provided outside the blade 2.

The frame lever 31 includes a first lever 33 for connecting one end 9a of the torsion actuator 9 and one end 4a of the flap 4, and a second lever 9 for the other end 9 of the torsion actuator 9.
b and the second lever 3 connecting the other end 4b of the flap 4
And the vertical displacement of the flap driving blade 3
To communicate. Shaft 6 of flap drive blade 3 and first lever 33
Is connected via a bearing 32, the torsion torque of the torsion actuator 9 around the torsion axis L2 is
3 and is transmitted to the flap drive blade 3.

Since the torsion actuator 9 is made of a piezo element as described above, the amount of torsional displacement can be increased by extending in the longitudinal direction. Therefore, when the length of the torsional actuator 9 is longer than the length of the flap 4, the second lever 34 is provided inclined as shown in FIG.

The other end 9b of the torsional actuator 9 is
The second lever 3 is fixed to the lever 34 and the torsional displacement of the torsional actuator 9 around the torsional axis L2 is restrained.
Fixed to 4. Accordingly, when a torsional torque is generated in the torsional actuator 9, the flap driving blade 3 is angularly displaced around the torsional axis L2 via the shaft 6 and the angle of attack α is displaced. One end of the lever 31 is displaced to drive the flap 4 to angular displacement.

As described above, in the present embodiment, the frame lever 31 for transmitting the displacement of the flap driving blade 3 is connected to the blade 2.
This prevents the drag acting on the blade 2 from fluctuating due to the angular displacement of the frame lever 31.

The flap 4 of the flap drive device 30
Is not limited to a configuration in which the hinge is made of a composite material and is attached to the blade 2 so as to be freely angularly displaceable, but may be a configuration in which the hinge is attached to the blade 2 as shown in FIG. In this case, both ends 4a, 4 of the flap 4
The hinge shafts 36 and 37 are fixed coaxially to the angular displacement axis L1 of the flap 4 from b, and the shaft insertion holes 38 and 39 for supporting the hinge shafts 36 and 37 in the blade 2 so as to be angularly displaceable.
Is formed. Further, one hinge shaft 37 is provided so as to extend in accordance with the length of the torsional actuator 9, and the second lever 44 of the frame lever 31 is not inclined but is provided with the first hinge shaft 37.
The lever 33 is provided on a straight line symmetrically and is fixed to the tip of the hinge shaft 37. Thereby, the force acting on the second lever 44 is reduced as compared with the inclined second lever 34 shown in FIG.

FIG. 13 is a perspective view showing a flap driving device 40 according to still another embodiment of the present invention.
Is a plan view thereof, and FIG. 15 is a sectional view thereof. The components corresponding to the flap driving device 1 shown in FIGS. 1 to 4 are denoted by the same reference numerals.

The flap driving blade 3 of the flap driving device 40
Is fixed to a flexible shaft 42 having flexibility instead of the shaft 6 of the flap drive device 1. The flexible shaft 42 is a shaft that can bend but can transmit torque. The flap driving blade 3 is fixed to one end of the flexible shaft 42 with displacement around the axis of the flexible shaft 42 being restrained.
Is fixed to the other end of the torsion actuator 9 coaxially with the torsion axis L2 while the displacement around the torsion axis L2 is restricted. The other end of the flexible shaft 42 is supported by the blade 2 via a bearing 41 so as to be angularly displaceable. The other end 9b of the torsion actuator 9 is fixed to the blade 2 via the mounting member 43. Therefore, according to the drive voltage of the torsional actuator 9, the torsional actuator 9
Is twisted around the torsion axis L2, the torsional torque causes the flap driving blade 3 to angularly displace via the flexible shaft 42, thereby generating air force on the flap driving blade 3 and causing the flap driving blade 3 to move up and down. Will be displaced. At this time, the vertical movement of the flap driving blade 3 is allowed by the flexible shaft 42 having flexibility.

By providing the flexible shaft 42 in this manner, the displacement driving of the flap 4 can be performed with a simple configuration.

FIG. 16 is a perspective view showing a flap driving device 50 according to still another embodiment of the present invention.
5 is a front view showing a link mechanism 51 of the flap drive device 50. FIG. The flap driving device 1 shown in FIGS.
Are given the same reference numerals. In the flap drive device 50, the displacement of the transmission lever 5 is transmitted to the flap 4 via the link mechanism 51.

Unlike the flap driving device 1, the angular displacement axis L3 of the transmission lever 5 is provided at a position shifted from the angular displacement axis L1 of the flap 4 and parallel to the angular displacement axis L1. A lever link 52 protruding radially downward around the angular displacement axis L3 is fixed to one end 5a of the transmission lever 5, and a flap projecting downward radially around the angular displacement axis L1 at the lower portion of the flap 4. The link 54 is fixed, and the distal ends of the lever link 52 and the flap link 54 are connected to both ends of the connecting link 53 so as to be angularly displaceable.

The tip of the lever link 52 and the transmission lever 5
A1 between the angular displacement axis L3 and the flap link 5
A between the front end of the flap 4 and the angular displacement axis L1 of the flap 4
2 is selected in a relationship of A1> A2. Therefore, the angular displacement β1 of the lever link 52 and the flap link 54
Is related to the angular displacement amount β2, β2 = (A1 / A2) · β
1 and the amount of angular displacement of one end 5a of the transmission lever 5 is A
The image is enlarged to 1 / A2 times and transmitted to the flap 4.

Since the flap driving blade 3 is displaced within the range of the long hole 8 formed in the blade 2, the amount of vertical displacement of the flap driving blade 3 is limited by the blade thickness of the blade 2. However, by expanding the amount of displacement of the transmission lever 5 via the link mechanism 51 and transmitting it to the flap 4 as in the present embodiment, the flap 4 can be moved regardless of the amount of displacement of the flap driving blade 3.
Can be greatly driven by angular displacement. A1 <
By selecting A2, the driving force of the transmission lever 5 can be increased, and the flap 4 can be driven with a large force.

The enlarged transmission mechanism of the transmission lever 5 is not limited to the link mechanism 51 shown in FIGS. 16 and 17, but may be a gear mechanism 57 as shown in FIGS.
It may be. The gear mechanism 57 includes a large sector gear 58 fixed to one end 5 a of the transmission lever 5 and a small sector gear 59 fixed to the flap 4 and meshing with the large sector gear 58.
It is composed of The large sector gear 58 is fixed to the transmission lever 5 so that its angular displacement axis is coaxial with the angular displacement axis L3 of the transmission lever 5, and the angular displacement axis of the small sector gear 59 is coaxial with the angular displacement axis L1 of the flap 4. Flap 4
Fixed to As shown in FIG.
The relationship between the radius R1 of 8 and the radius R2 of the small sector area 59 is selected such that R1> R2. by this,
When the amount of angular displacement of the transmission lever 5 is an angle β3 and the amount of angular displacement of the flap 4 is an angle β4, β4 = (R1 / R2) ·
β3, and the amount of angular displacement of the transmission lever 5 is increased to R1 / R2 times. In this way, even when the amount of vertical displacement of the flap driving blade 3 is limited, the gear mechanism 57
The flap 4 can be largely angularly displaced by the enlargement transmission mechanism using.

FIG. 20 is a perspective view showing a helicopter 65 provided with the flap drive device 1 of the present invention. Since the helicopter 65 flies forward while rotating the rotor blade 66, the blade 2 has a different airspeed between the forward side and the reverse side. Therefore, the blade 2 performs a periodic pitch angle control so that the pitch angle (angle of attack) is increased on the reverse side and the pitch angle is reduced on the forward side. In addition, helicopter 65
The pitch angle of the blade 2 is changed by the steering operation during flight.

As described above, when the pitch angle of the blade 2 is displaced, the angle of attack α of the flap driving blade 3 provided at the tip of the blade 2 is also displaced, so that the flap driving blade 3 can be accurately controlled. Next, it is necessary to cancel the pitch angle of the blade 2.

FIG. 21 is a block diagram showing a control state of the flap driving device 1. The blade control means 78 includes:
A signal corresponding to the control amount of the control stick 70 is input, and is combined with the signal corresponding to the periodic pitch angle displacement of the blade 2 to output a blade control signal 72 corresponding to a target pitch angle of the blade 2. The actuator 73 changes the pitch angle of the blade 2 according to the blade control signal 72.

The blade control means 78 controls the blade 2
The flap target signal 74 is supplied to the flap drive blade control means 75 so that the angle of the flap 4 with respect to
To enter.

The flap driving blade control means 75 generates an angle of attack target signal 79 of the flap driving blade 3 corresponding to the flap target signal 74.
Is a value at the time when the pitch angle is 0 °, and is once input to the arithmetic circuit 80. The arithmetic circuit 80 receives the blade control signal 72 from the blade control means 78, and a value obtained by modifying the attack angle target signal 79 by the blade control signal 72 is used as an actuator command signal for the flap driving blade 3. It is output as 77.

The output voltage of the actuator command signal 77 is amplified by an amplifier 76 and applied to the torsional actuator 9 as a driving voltage. As a result, the angle of attack α of the flap driving blade 3 is displaced to drive the flap driving blade 3 up and down. 4 is displaced to a target angle.

As described above, even if the blade 2 is displaced by a pitch angle, the actuator command signal 77 in which the pitch angle of the blade 2 is canceled by the arithmetic circuit 80 is output from the flap 4, so that the pitch angle of the blade 2 Regardless of this, the flap 4 can be accurately driven by angularly displacing the flap driving blade 3 to the target angle of attack α.

FIG. 22 is a block diagram showing a control state of the flap drive device 1 for performing feedback control. The components corresponding to those in the block diagram of FIG. 21 are denoted by the same reference numerals.

The blade 2 is provided with a flap angle sensor 67 for detecting the angle of the flap 4 with respect to the blade 2. Each blade 2 is provided with a blade pitch angle sensor 68 for detecting a pitch angle.

In the arithmetic circuit 80, the attack angle target signal 79 is corrected by the blade control signal 72 in the same manner as described above, and the pitch angle of the blade 2 is canceled.

The angle of the flap 4 is detected by the flap angle sensor 67, and a signal corresponding to the angle of the flap 4 is fed back to the flap control means 78, and the flap 4 fed back to the flap target signal 74.
Is controlled so as to match the signal corresponding to the angle. By performing the feedback control in this manner, the flap 4 can be accurately controlled to a target angle.

A signal corresponding to the pitch angle of the blade 2 detected by the blade pitch angle sensor 68 is fed back to the blade control means 78, and the target blade control signal 72 and the fed back blade 2
Is controlled so as to match the signal corresponding to the pitch angle of. Thus, the pitch angle of the blade 2 can be accurately controlled to a target pitch angle.

The blade pitch angle sensor 68 is the blade 2
Swash plate 69 for changing pitch angle
May be directly detected. Alternatively, the angle may be obtained from the displacement of the control stick 70 or the corresponding actuator, or the rotor blade 66
The pitch angle of the blade 2 may be obtained from the rotation angle sensor described above.

FIG. 23 is a perspective view showing a flap driving device 81 according to still another embodiment of the present invention.
Is a plan view thereof. The components corresponding to the flap driving device 1 shown in FIGS. 1 to 4 are denoted by the same reference numerals. One end 9a of the torsion actuator 9 has a torsion axis L
A torsion shaft 83 projecting in two directions is supported on the blade 2 so as to be angularly displaceable, and a torsion shaft link 84 projecting upward is fixed to the torsion shaft 83. The flap 4 is connected to the blade 2 by a hinge so as to be freely angularly displaceable, and has one end 4a.
, An arm 93 extending toward the front edge of the blade 2 is fixed. The hinge shaft 82 of the flap 4 is shown in FIGS.
As shown in FIG. 6, a cylindrical member 92 is inserted through the hinge shaft 82 so as to be angularly displaceable about the angular displacement axis L1 of the flap 4. A pair of hinge shaft links 85 and 89 projecting upward are fixed to the cylindrical member 92, and are pivotally supported on the arm 93 so as to be angularly displaceable. The tip of the torsion shaft link 84 and the tip of the hinge shaft link 85 are connected to both ends of the connection link 86 so as to be angularly displaceable.

A flap shaft 90 protruding coaxially with the angular displacement axis L4 of the flap driving blade 3 is rotatably supported at the tip of an arm 93 so as to be angularly displaceable, and a flap shaft link 87 projecting upward is fixed. The distal end of the flap shaft link 87 and the distal end of the hinge shaft link 89 are connected to both ends of the connection link 88 so as to be angularly displaceable.

Therefore, when the torsional actuator 9 is angularly displaced around the torsional axis L2 in the direction of the arrow P in FIG. 23, the cylindrical member 92 is angularly displaced via the links 84 to 85, and also via the links 87 to 89. The flap driving blade 3 is angularly displaced around the angular displacement axis L4 of the flap driving blade, and the angle of attack α of the flap driving blade 3 increases in the positive direction.
At this time, the flap driving blade 3 is displaced upward by aerodynamic force. This displacement causes the flap 4 to be further angularly displaced downward via the arm 93.

Thus, the torsional actuator 9
Can displace the flap drive blade 3 via the links 84 to 89 to drive the flap 4.

On the contrary, the torsional actuator 9 is moved by the arrow P
When twisted in the direction of arrow Q, which is the opposite direction to the above, the angle of attack α of the flap driving wing 3 is displaced in the negative direction by the operation opposite to that described above, and the tip of the arm 93 is displaced downward by the air force, and 4 is angularly displaced upward.

As described above, the angle of attack α of the flap driving blade 3 is controlled by the torsional actuator 9 so that the flap driving blade 3
The flap 4 can be driven to be angularly displaced by the aerodynamic force generated in the flap 4.

[0066]

As described above, according to the first aspect of the present invention, the actuator generates an aerodynamic force on the flap driving wing by angularly displacing the angle of attack of the flap driving wing, and the flap generated by the generated aerodynamic force. , The flap can be driven sufficiently even when the driving force of the actuator is small.

According to the second aspect of the present invention, the air force generated in the flap can be effectively transmitted to the flap by the transmission mechanism having a simple structure including the transmission lever.

According to the third aspect of the present invention, since the angular displacement of the transmission lever is enlarged and transmitted to the flap via the enlargement transmission mechanism, even if the displacement of the flap driving blade is small. The angular displacement of the flap can be made sufficiently large.

According to the fourth aspect of the present invention, since the pitch angle of the blade is canceled by the calculating means and the angle of attack of the flap driving blade is controlled, the flap can be accurately controlled regardless of the pitch angle of the blade. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a flap drive device 1 according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the flap driving device 1. FIG.

FIG. 3 is a cross-sectional view taken along line III-III in FIG.

4 is a plan view of the flap driving device 1. FIG.

FIG. 5 shows a flap drive device 1 including hinges 20 and 21.
FIG.

FIG. 6 is a perspective view showing a hinge 20;

FIG. 7 is a perspective view showing a hinge 20a.

8 is an exploded perspective view showing the flap 4 connected by the hinge 23. FIG.

FIG. 9 is a perspective view showing a flap driving device 30 according to another embodiment of the present invention.

FIG. 10 is a perspective view of the flap drive device 30 with the blade 2 cut away.

FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 8;

12 is an exploded perspective view showing the flap driving device 30 including the hinge 35. FIG.

FIG. 13 is a perspective view of a flap driving device 40 according to still another embodiment of the present invention, in which the blade 2 is cut away.

14 is a plan view of the flap driving device 40. FIG.

FIG. 15 is a sectional view of the flap drive device 14.

FIG. 16 is a perspective view showing a flap driving device 50 according to still another embodiment of the present invention.

17 is a front view showing a link mechanism 51 of the flap driving device 50. FIG.

FIG. 18 shows a flap drive device 50 including a gear mechanism 57.
FIG.

19 is a front view showing the gear mechanism 57. FIG.

FIG. 20 shows a helicopter 65 including the flap drive device 1.
It is a perspective view of.

FIG. 21 is a block diagram showing a control state of the flap driving device 1.

FIG. 22 is a block diagram illustrating a control state of the flap drive device 1 that performs feedback control.

FIG. 23 is a perspective view showing a flap driving device 81 according to still another embodiment of the invention.

24 is a plan view of the flap driving device 81. FIG.

FIG. 25 is a perspective view showing the flap 4 including the cylindrical member 92.

26 is a sectional view of the cylindrical member 92. FIG.

[Explanation of symbols]

 1, 30, 40, 50, 81 flap drive device 2 blade 3 flap drive blade 4 flap 5 transmission lever 11 hinge 72 blade control signal 75 flap drive blade control means 78 blade control means 80 arithmetic circuit

Continuation of the front page (72) Inventor Eiichi Yamakawa 2 Kawasaki-cho, Kakamigahara-shi, Gifu Prefecture Inside the Commuter Helicopter Advanced Technology Laboratory Co., Ltd. (56) References JP-A-10-271852 (JP, A) US Pat. No. 5,538,083 (US, A) US Pat. No. 3,297,969 (US, A) US Pat. No. 3,055,618 (US, A) US Pat. No. 4,043,523 (US, A) US Pat. No. 4,124,180 (US, A) (58) Fields of Study (Int. Cl. ⁶ , DB name) B64C 27/615 B64C 27/46-27/473

Claims (4)

(57) [Claims] 1. A flap attached to a trailing edge side of a blade so as to be capable of angular displacement, a flap driving blade provided at a tip end of the blade so as to be capable of varying an angle of attack, and an actuator for angularly displacing the angle of attack of the flap driving blade. A flap driving device for a rotor blade, wherein the flap is driven by pneumatic force generated in a flap driving blade. 2. The flap driving device for a rotor blade according to claim 1, further comprising a transmission lever supported so as to be capable of angular displacement and interlocking the flap driving blade and the flap. 3. The flap driving device for a rotor blade according to claim 2, further comprising an expansion transmission mechanism that drives the flap by expanding the angular displacement of the transmission lever. 4. A blade control means for outputting a blade control signal corresponding to a target blade pitch angle and an angle of attack target signal corresponding to a target angle of attack of a flap driving blade, an angle of attack target signal and a blade And a calculating means for calculating a signal that follows the attack angle target signal based on the control signal and outputting the signal as a command signal to an actuator of the flap driving blade. A flap drive device for a rotor blade according to any one of the above.