JP2016101902A - Hydraulic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic actuator which can suppress interference between a flap and a spoiler.SOLUTION: A hydraulic actuator for driving a spoiler is equipped with a piston rod 30 for driving the spoiler, and a stopper piston 40 as movement restriction means which can restrict movement of a piston rod 30 in a direction in which the spoiler approaches the flap in an overlapping region in which a driving range of the flap and a driving range of the spoiler are overlapped with each other and at a neutral position which is a position of the spoiler when an aircraft is cruised.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic actuator for driving an aircraft wing spoiler.

  Conventionally, a spoiler drive mechanism that drives a spoiler of an aircraft wing by a hydraulic actuator is known (see, for example, Patent Document 1). FIG. 9 shows an example of the configuration of the spoiler drive mechanism, and shows the state of the flap 110 of the blade 100 and the spoiler 120. Note that flap 110 and spoiler 120 indicated by solid lines indicate a neutral position that is the position of flap 110 and spoiler 120 when the aircraft is cruising under certain conditions. The neutral position means a state where the spoiler 120 is housed.

  The hydraulic actuator 130 of the spoiler drive mechanism is connected to the spoiler 120, and the spoiler 120 moves up and down based on the reciprocating motion of the piston rod 131 of the hydraulic actuator 130. When the flap 110 and the spoiler 120 are deployed in a high lift structure, the flap 110 is lowered from the neutral position by an actuator (not shown) that drives the flap 110 as shown by a two-dot chain line, and the spoiler is driven by the hydraulic actuator 130. 120 descends from the neutral position. Thereby, a part of the gap G formed between the blade 100 and the flap 110 is filled with the spoiler 120.

  Further, when the aircraft is decelerated, the spoiler 120 is raised from the neutral position by the hydraulic actuator 130 as shown by the broken line in the figure. Thereby, spoiler 120 becomes air resistance, and the speed of an aircraft falls.

  Thus, the spoiler 120 moves up and down from the position of the spoiler 120 indicated by the two-dot chain line to the position of the spoiler 120 indicated by the broken line, while the flap 110 moves up and down from the position of the flap 110 indicated by the two-dot chain line to the neutral position. Therefore, an overlapping region R where the driving range DS of the spoiler 120 and the driving range DF of the flap 110 overlap is formed.

Special table 2008-529871 gazette

  By the way, in the spoiler drive mechanism of FIG. 9, the flap 110 and the spoiler 120 are moved down by the weight of the spoiler 120 when the hydraulic actuator 130 stops driving due to, for example, power loss when the spoiler 120 is in the neutral position. And the flap 110 presses the spoiler 120. In order to solve this problem, when the flap 110 and the spoiler 120 interfere with each other, the spoiler drive mechanism in FIG. 9 releases the hydraulic pressure applied to the spoiler 120 from the hydraulic actuator 130 and returns the spoiler 120 to the neutral position. It has a discharge valve (not shown) that is driven so that it can be operated.

However, although the spoiler drive mechanism of FIG. 9 reduces the force with which the flap 110 pushes the spoiler 120, it is not configured to suppress interference between the flap 110 and the spoiler 120.
An object of the present invention is to provide a hydraulic actuator that can suppress interference between a flap and a spoiler.

  (1) One form of the hydraulic actuator according to the present invention is a hydraulic actuator for driving a spoiler, wherein a piston rod for driving the spoiler, a flap driving range, and an overlapping region where the spoiler driving range overlaps. And a movement restricting means capable of restricting movement of the piston rod in a direction in which the spoiler approaches the flap at a neutral position that is a position of the spoiler when the aircraft cruises.

  According to this hydraulic actuator, when the spoiler is located in the overlapping region, even if the spoiler tries to move toward the flap by its own weight, for example, when the power of the aircraft is lost, the movement restriction means restricts the movement of the piston rod. For this reason, the spoiler is restrained from moving in the direction of approaching the flap in the overlapping region. Therefore, it becomes difficult for a spoiler and a flap to interfere. In addition, even when the spoiler is moving toward the flap by its own weight when the spoiler is positioned at the neutral position, the spoiler enters the overlapping region by suppressing the movement of the spoiler in the direction approaching the flap. It is suppressed. Therefore, the spoiler and the flap do not interfere with each other.

  (2) According to one aspect dependent on the hydraulic actuator, a first hydraulic chamber in which a piston of the piston rod is housed and generates a hydraulic pressure for lowering the spoiler, and a hydraulic pressure for raising the spoiler A second hydraulic chamber that generates the first hydraulic chamber and a housing that is partitioned by the piston, and the movement restricting means includes a stopper piston that partitions the second hydraulic chamber and the third hydraulic chamber in the housing, and the valve device moves the first hydraulic chamber. Based on the relationship between the force that the stopper piston receives from the hydraulic pressure of the third hydraulic chamber when the first hydraulic chamber and the third hydraulic chamber communicate with each other, and the force that the piston receives from the hydraulic pressure of the first hydraulic chamber The movement of the piston rod is limited, and the area of the stopper piston that receives the hydraulic pressure of the third hydraulic chamber is that of the first hydraulic chamber. Larger than the area of the piston subjected to pressure.

  According to this hydraulic actuator, when the valve device communicates the first hydraulic chamber and the third hydraulic chamber, that is, when the hydraulic pressure in the first hydraulic chamber and the hydraulic pressure in the third hydraulic chamber are substantially equal, Even if the piston is pushed, the force by which the piston pushes the stopper piston does not become larger than the force by which the stopper piston pushes the piston. Therefore, the spoiler is prevented from approaching the flap.

(3) According to one aspect dependent on the hydraulic actuator, the piston contacts an outer peripheral portion of the stopper piston in a moving direction of the piston.
When the spoiler approaches the flap in the overlapping region or the neutral position, the stopper piston moves so that the third hydraulic chamber is contracted by being pushed by the piston.

  According to the hydraulic actuator, the stopper piston is prevented from being tilted with respect to the housing when the stopper piston moves, as compared with the configuration in which the piston pushes the inner portion of the stopper piston and moves the stopper piston. Is done.

  (4) According to one mode dependent on the hydraulic actuator, the stopper piston expands the third hydraulic chamber by contacting a portion inside the outer peripheral portion of the stopper piston in the moving direction of the stopper piston. A restricting portion for restricting movement in the direction of movement.

  According to this hydraulic actuator, since the restricting portion comes into contact with a portion inside the outer peripheral portion of the stopper piston, the piston pushes the outer peripheral portion of the stopper piston. Therefore, when the stopper piston moves, the stopper piston is prevented from being inclined with respect to the housing.

  (5) According to an aspect dependent on the hydraulic actuator, the stopper piston includes a restricting portion that restricts movement of the third piston in a direction in which the third hydraulic chamber is expanded, and the stopper piston can contact the restricting portion. A flat plate-like base portion and a guide portion that extends from the base portion in the movement direction of the stopper piston and guides the movement of the stopper piston in the movement direction, and the guide portion when the base portion contacts the restriction portion. The front end surface of the portion is located closer to the second hydraulic chamber than the end surface of the restricting portion on the third hydraulic chamber side.

  According to this hydraulic actuator, even if the thickness of the base portion of the stopper piston is reduced, the inclination of the stopper piston with respect to the housing can be suppressed. For this reason, the inclination of the stopper piston with respect to the housing can be suppressed, and the length of the housing in the moving direction of the stopper piston can be shortened.

  According to the hydraulic actuator, interference between the spoiler and the flap can be suppressed.

The block diagram of the spoiler drive mechanism provided with the hydraulic actuator of embodiment. FIG. 2 is an enlarged view of a part of the hydraulic actuator of FIG. 1. Sectional drawing of a hydraulic actuator when a spoiler raises. Sectional drawing of a hydraulic actuator when a spoiler descend | falls. Sectional drawing of a hydraulic actuator when a spoiler is located in an overlap area. Sectional drawing of a hydraulic actuator when supply of electric power is interrupted | blocked by the spoiler drive mechanism. The enlarged view of a part of hydraulic actuator of a modification. The enlarged view of a part of hydraulic actuator of a modification. The block diagram of the conventional spoiler and flap.

  With reference to FIG. 1, the structure of the spoiler drive mechanism 1 is demonstrated. For convenience of explanation, the configuration diagram of the wing 100, the spoiler 120, and the flap 110 of FIG. 9 is used to describe the wing, the spoiler, and the flap.

  The spoiler drive mechanism 1 includes a hydraulic actuator 20 for driving the spoiler 120, a hydraulic source 10 that supplies oil to the hydraulic actuator 20, and a reservoir 11 that stores oil discharged from the hydraulic actuator 20. The hydraulic actuator 20, the hydraulic power source 10, and the reservoir 11 are connected by an oil passage. A control valve 12, a first hydraulic valve 13, and a second hydraulic valve 14, which is an example of a valve device, are provided between the hydraulic actuator 20, the hydraulic source 10, and the reservoir 11 to control oil in the oil passage. It has been. The spoiler drive mechanism 1 includes a control unit 15 that controls the operation of the hydraulic source 10, the control valve 12, and the second hydraulic valve 14.

The cylinder 21, which is an example of the housing of the hydraulic actuator 20, is supplied with oil and is partitioned into a first hydraulic chamber 22, a second hydraulic chamber 23, and a third hydraulic chamber 24.
The control valve 12 is a solenoid valve, for example, and is connected to the hydraulic source 10, the reservoir 11, the first hydraulic valve 13, and the first hydraulic chamber 22. The control valve 12 supplies oil to the second hydraulic chamber 23, discharges the oil from the first hydraulic chamber 22, discharges the oil from the first hydraulic chamber 22, and discharges the oil from the first hydraulic chamber 22. It is possible to switch to the second communication position 12Y for supplying oil and the shut-off position 12Z for shutting off the oil supply / discharge of the hydraulic chambers 22 and 23. When electric power is not supplied to the control valve 12, the control valve 12 is in the second communication position 12Y.

  The first hydraulic valve 13 operates based on the hydraulic pressure of the hydraulic source 10 and the hydraulic pressure of the second hydraulic chamber 23, and is connected to the control valve 12 and the first hydraulic chamber 22. The first hydraulic valve 13 can be switched to a communication position 13X for communicating the first hydraulic chamber 22 and the control valve 12 and a blocking position 13Y for blocking communication between the first hydraulic chamber 22 and the control valve 12. is there. Further, the first hydraulic valve 13 has a relief function for discharging oil to the control valve 12 when the hydraulic pressure in the first hydraulic chamber 22 becomes a specified value or more at the cutoff position 13Y.

  The second hydraulic valve 14 is, for example, a solenoid valve, and is connected to the first hydraulic chamber 22, the third hydraulic chamber 24, and the reservoir 11. The second hydraulic valve 14 communicates the third hydraulic chamber 24 and the reservoir 11, and has a first valve position 14X for blocking communication between the first hydraulic chamber 22 and the third hydraulic chamber 24, and a first hydraulic pressure. The chamber 22 and the third hydraulic chamber 24 can communicate with each other, and the second valve position 14Y can be switched to block the communication between the third hydraulic chamber 24 and the reservoir 11. The second hydraulic valve 14 is in the second valve position 14Y when power is not supplied to the second hydraulic valve 14.

  A detailed configuration of the hydraulic actuator 20 will be described with reference to FIGS. 1 and 2. 1 and 2 show the state of the hydraulic actuator 20 at the position of the spoiler 120 (hereinafter referred to as “neutral position”) when the aircraft is cruising.

  As shown in FIG. 1, the cylinder 21 is formed in a cylindrical shape in which one of the longitudinal directions is open and the other is closed. A seal member 51 is attached to the inner peripheral portion of the opening 21 </ b> A of the cylinder 21. An example of the seal member 51 is an O-ring. In the cylinder 21, a piston rod 30, a position sensor 25 that detects the position of the piston rod 30, and a cover 26 that surrounds the position sensor 25 are accommodated so as to be coaxial with the central axis of the cylinder 21. An example of the position sensor 25 is a differential transformer type displacement meter. The position sensor 25 transmits the detected position information of the piston rod 30 to the control unit 15.

  The piston rod 30 protrudes outside the cylinder 21 through the opening 21 </ b> A of the cylinder 21. The piston rod 30 includes a piston 31 that partitions the first hydraulic chamber 22 and the second hydraulic chamber 23, and a recess 34 that houses a part of the position sensor 25.

  As shown in FIG. 2, the piston 31 includes an annular plate-shaped base 32. A seal member 52 is attached to the outer peripheral portion of the base portion 32. An example of the seal member 52 is an O-ring. A cylindrical guide portion 33 extending on the opposite side to the first hydraulic chamber 22 is formed on the outer peripheral portion of the base portion 32. As shown in FIG. 1, an output portion 35 that is connected to the spoiler 120 and drives the spoiler 120 is formed at a portion of the piston rod 30 that protrudes from the cylinder 21. 1 and 2, the piston rod 30 is composed of two members, but may be composed of one member. In the following description, the position of the piston 31 shown in FIGS. 1 and 2, that is, the position of the piston 31 when the spoiler 120 is in the neutral position is referred to as “neutral position PN”.

  As shown in FIG. 2, a stopper piston 40, which is an example of a movement restricting unit that restricts the spoiler 120 from approaching the flap 110 by restricting the movement of the piston rod 30, is accommodated in the cylinder 21. Yes. The stopper piston 40 is disposed coaxially with the central axis of the cylinder 21 and partitions the second hydraulic chamber 23 and the third hydraulic chamber 24.

  A position sensor 25 and a cover 26 are inserted into the stopper piston 40. The stopper piston 40 includes an annular plate-shaped base 41. A seal member 53 is attached to the outer peripheral portion of the base 41. An example of the seal member 53 is an O-ring. In addition, a cylindrical guide portion 42 extending on the opposite side to the third hydraulic chamber 24 is formed on the outer peripheral portion of the base portion 41.

  In addition, the outer peripheral part of the guide part 42 may be formed in a polygonal shape instead of the cylindrical shape as long as it contacts the inner peripheral surface of the cylinder 21 at a plurality of locations in the circumferential direction. Even in the stopper piston 40 having such a configuration, the communication between the second hydraulic chamber 23 and the third hydraulic chamber 24 is blocked by the seal member 53 attached to the base 41.

  As shown in FIG. 2, the area of the end surface 41A of the base 41 that receives the hydraulic pressure of the third hydraulic chamber 24 in the stopper piston 40 is larger than the area of the end surface 32A of the base 32 that receives the hydraulic pressure of the first hydraulic chamber 22 in the piston 31. large.

  A cylindrical restricting portion 27 that restricts the movement of the stopper piston 40 to the side where the third hydraulic chamber 24 expands is attached to the outer peripheral portion of the cover 26. The central axis of the restricting portion 27 is coaxial with the central axis of the cylinder 21.

  In addition, the outer peripheral part of the control part 27 is not restricted to an annular | circular shape, A polygonal shape may be sufficient. Further, the central axis of the restricting portion 27 may be offset with respect to the central axis of the cylinder 21. Further, the thickness of the restricting portion 27 can be arbitrarily set.

  As shown in FIG. 2, the restricting portion 27 is in contact with the inner peripheral portion of the base portion 41 of the stopper piston 40. In this state, the distal end surface 42A of the guide portion 42 of the stopper piston 40 is on the opposite side (second hydraulic chamber 23 side) to the third hydraulic chamber 24 relative to the end surface 27A on the third hydraulic chamber 24 side of the restricting portion 27. It is located and is located closer to the third hydraulic chamber 24 side than the end surface 27B of the restricting portion 27 on the second hydraulic chamber 23 side. Note that the tip surface 42A of the guide portion 42 is positioned at the same position as the end surface 27B of the restricting portion 27 in the axial direction of the cylinder 21 or less than the end surface 27B of the restricting portion 27 by reducing the thickness of the restricting portion 27, for example. 2 You may be located in the hydraulic chamber 23 side.

  The operation of the spoiler drive mechanism 1 will be described with reference to FIGS. 1 and 3 to 6. In the following description, the “first movement direction W1” refers to the movement direction of the piston rod 30 in which the first hydraulic chamber 22 contracts and the second hydraulic chamber 23 expands, and the stopper piston 40 in which the third hydraulic chamber 24 expands. Direction of movement. The “second movement direction W2” refers to the movement direction of the piston rod 30 in which the first hydraulic chamber 22 expands and the second hydraulic chamber 23 contracts, and the movement direction of the stopper piston 40 in which the third hydraulic chamber 24 contracts. Show. When the piston rod 30 moves in the first movement direction W1, the spoiler 120 is raised, and when the piston rod 30 moves in the second movement direction W2, the spoiler 120 is lowered.

  When the spoiler 120 is raised, the control unit 15 sets the control valve 12 to the first communication position 12X, sets the second hydraulic valve 14 to the first valve position 14X, and starts supplying oil from the hydraulic source 10. Accordingly, since the first hydraulic valve 13 becomes the communication position 13X, oil is supplied from the hydraulic source 10 to the second hydraulic chamber 23, and the oil in the first hydraulic chamber 22 is discharged to the reservoir 11. Accordingly, as shown in FIG. 3, the piston rod 30 moves in the first movement direction W1. As indicated by a two-dot chain line in FIG. 3, when the piston 31 contacts the opening 21A of the cylinder 21, the movement of the piston rod 30 in the first movement direction W1 is limited.

  On the other hand, when lowering the spoiler 120, the control unit 15 sets the control valve 12 to the second communication position 12Y, sets the second hydraulic valve 14 to the first valve position 14X, and starts supplying oil from the hydraulic source 10. Accordingly, since the first hydraulic valve 13 becomes the communication position 13X, oil is supplied from the hydraulic source 10 to the first hydraulic chamber 22, and the oil in the second hydraulic chamber 23 is discharged to the reservoir 11. Accordingly, as shown in FIG. 4, the piston rod 30 moves in the second movement direction W2.

  Further, the control unit 15 further lowers the spoiler 120 from the neutral position and moves so as to reduce the gap G between the blade 100 and the flap 110 in the overlapping region R, that is, the spoiler drive mechanism 1 operates the droop function. In this case, the control valve 12 is set to the second communication position 12Y, and the second hydraulic valve 14 is set to the first valve position 14X. As a result, as shown in FIG. 5, the guide portion 33 of the piston 31 pushes the guide portion 42 of the stopper piston 40, and the piston rod 30 and the stopper piston 40 integrally move in the second movement direction W2.

The operation of this embodiment will be described.
For example, when the spoiler drive mechanism 1 is stopped due to the loss of the power source, power is not supplied to the control valve 12 and the second hydraulic valve 14. Further, since the hydraulic pressure source 10 is not driven, no oil is supplied to the first hydraulic valve 13. Therefore, the control valve 12 is in the second communication position 12Y, the first hydraulic valve 13 is in the cutoff position 13Y, and the second hydraulic valve 14 is in the second valve position 14Y. Thereby, since the second hydraulic chamber 23 communicates with the reservoir 11, the oil in the second hydraulic chamber 23 easily flows out, and the first hydraulic chamber 22 communicates with the hydraulic source 10, so that the oil in the first hydraulic chamber 22 flows. Difficult to leak. For this reason, the spoiler 120 is in a state in which it is easy to descend and difficult to ascend. For this reason, for example, the spoiler 120 may move down due to its own weight.

  On the other hand, since the first hydraulic chamber 22 and the third hydraulic chamber 24 communicate with each other, the hydraulic pressure in the first hydraulic chamber 22 and the hydraulic pressure in the third hydraulic chamber 24 are substantially equal to each other. For this reason, even if the piston rod 30 tries to move in the second movement direction W2 from the neutral position PN by the dead weight of the spoiler 120, it is supported by the stopper piston 40. In particular, since the area of the end surface 41A of the base 41 of the stopper piston 40 is larger than the area of the end surface 32A of the base 32 of the piston 31, the movement of the piston rod 30 in the second movement direction W2 is limited. Furthermore, the force that the spoiler 120 pushes the piston rod 30 in the first movement direction W1 by its own weight is the difference between the force that the stopper piston 40 receives from the hydraulic pressure of the third hydraulic chamber 24 and the force that the piston 31 receives from the first hydraulic chamber 22. Small enough than. For this reason, the piston rod 30 does not move from the neutral position PN in the second movement direction W2.

  Further, when the spoiler drive mechanism 1 is stopped due to the loss of power in a state where the piston rod 30 is positioned on the second movement direction W2 side with respect to the neutral position PN, the stopper piston 40 moves the piston rod 30 in the first movement direction. The stopper piston 40 and the piston rod 30 are integrally moved in the first movement direction W1 by pushing to W1. When the stopper piston 40 comes into contact with the restricting portion 27, the movement of the stopper piston 40 and the piston rod 30 in the first movement direction W1 stops. For this reason, the piston rod 30 is located in the neutral position PN.

According to this embodiment, the following effects are produced, for example.
(1) In the hydraulic actuator 20, as the movement restricting means, the piston rod 30 is moved second in a state where the second hydraulic valve 14 is in the second valve position 14Y and the first hydraulic chamber 22 and the third hydraulic chamber 24 are in communication. A stopper piston 40 that restricts movement in the direction W2 is provided. The area of the end surface 41A of the base portion 41 of the stopper piston 40 is larger than the area of the end surface 32A of the base portion 32 of the piston 31 of the piston rod 30. For this reason, as described in the above operation, since the movement of the piston rod 30 in the second movement direction W2 is limited, for example, when the spoiler 120 is located in the drive range DS other than the overlapping region R, the power source is lost. As a result, the spoiler 120 does not enter the overlap region R even if the spoiler drive mechanism 1 is stopped. Further, for example, when the spoiler 120 is located in the overlap region R, the piston rod 30 is pushed by the stopper piston 40 so that the piston rod 30 becomes the neutral position PN even if the spoiler drive mechanism 1 is stopped due to the loss of power. Therefore, the spoiler 120 is located in the drive range DS other than the overlapping region R. Therefore, the spoiler 120 and the flap 110 do not interfere with each other.

  (2) The piston 31 pushes the guide portion 42 that is the outer peripheral portion of the stopper piston 40. For this reason, it is suppressed that the stopper piston 40 inclines with respect to the cylinder 21 when the stopper piston 40 moves compared with the structure which a piston presses the inner peripheral part of a stopper piston.

  (3) The hydraulic actuator 20 includes a restricting portion 27 that comes into contact with the inner peripheral portion of the stopper piston 40. For this reason, since the piston 31 is configured to push the outer peripheral portion of the stopper piston 40, the effect (2) can be achieved while restricting the movement of the stopper piston 40 in the first movement direction W1.

  (4) The stopper piston 40 includes a guide portion 42. For this reason, even if the thickness of the base 41 of the stopper piston 40 is reduced, the length of the outer peripheral surface of the stopper piston 40 that slides with the inner peripheral surface of the cylinder 21 in the longitudinal direction of the cylinder 21 can be ensured. For this reason, the length of the cylinder 21 in the longitudinal direction can be shortened, and the stopper piston 40 is prevented from being inclined with respect to the cylinder 21 when the stopper piston 40 moves.

(Modification)
The description related to the embodiment is an example of the form that the hydraulic actuator according to the present invention can take, and is not intended to limit the form. In addition to the embodiment, the hydraulic actuator according to the present invention may take a form in which, for example, a modification of the embodiment shown below and at least two modifications not contradicting each other are combined.

(Modification 1)
In the embodiment described above, the restricting portion 27 is attached to the cover 26. However, the restricting portion may be configured by changing the shape of the cover 26 or changing the shape of the cylinder 21.

  For example, as shown in FIG. 7, a step portion 26 </ b> A as a restricting portion is formed on the cover 26. Thereby, the outer diameter of the portion of the cover 26 closer to the second moving direction W2 than the stepped portion 26A is smaller than the outer diameter of the portion of the cover 26 closer to the first moving direction W1 than the stepped portion 26A. The stopper piston 40 is restricted from moving in the first movement direction W1 by contacting the step portion 26A.

  Further, for example, as shown in FIG. 8, a step portion 21 </ b> B as a restricting portion is formed in the cylinder 21. Accordingly, the inner diameter of the portion of the cylinder 21 closer to the second moving direction W2 than the stepped portion 21B is larger than the inner diameter of the portion of the cylinder 21 closer to the first moving direction W1 than the stepped portion 21B. In the stopper piston 40, the guide portion 42 extends from the outer peripheral portion of the base portion 41 in the second movement direction W2. For this reason, the guide portion 33 of the piston 31 comes into contact with the base portion 41 of the stopper piston 40.

  The guide portion 42 may extend from the inner peripheral portion of the base portion 41 in the first movement direction W1. According to this configuration, since the guide portion 33 of the piston 31 and the guide portion 42 of the stopper piston 40 overlap in the radial direction of the cylinder 21, the dimension in the longitudinal direction of the cylinder 21 can be shortened.

(Modification 2)
In the above embodiment, the restricting portion 27 is in contact with the inner peripheral portion of the base portion 41 of the stopper piston 40 to restrict the movement of the stopper piston 40 in the first movement direction W1. You may contact the outer peripheral part. The restricting portion 27 is fixed to, for example, the inner peripheral surface of the cylinder 21. In the case of such a restricting portion 27, the guide portion 42 of the stopper piston 40 extends from the inner peripheral portion of the base portion 41 in the first movement direction W1. The guide portion 33 of the piston 31 of the piston rod 30 extends from the inner peripheral portion of the base portion 32 in the second movement direction W2.

(Modification 3)
In the above embodiment, the guide portion 42 of the stopper piston 40 extends from the base portion 41 toward the piston 31, but the shape of the stopper piston 40 is not limited to this. For example, the guide portion 42 may extend from the base portion 41 in the direction opposite to the piston 31. In this case, the guide portion 33 of the piston 31 contacts the outer peripheral portion of the base portion 41. For example, the guide part 42 may extend in both the direction from the base part 41 toward the piston 31 and the direction opposite to the piston 31. Further, for example, the guide portion 42 may be omitted from the stopper piston 40.

(Modification 4)
In the above embodiment, as the movement limiting means, the area of the end surface 41A of the base 41 of the stopper piston 40 is larger than the area of the end surface 32A of the base 32 of the piston 31, but the configuration of the movement limiting means is not limited thereto. I can't. For example, as a movement restricting means, a pressure increasing valve is provided in an oil passage connecting the first hydraulic chamber 22 and the third hydraulic chamber 24 so that the hydraulic pressure of the third hydraulic chamber 24 is larger than the hydraulic pressure of the first hydraulic chamber 22. May be. This prevents the piston rod 30 from moving from the neutral position PN in the second movement direction W2 even if the area of the end face 41A of the base 41 of the stopper piston 40 is equal to or less than the area of the end face 32A of the base 32 of the piston 31. It is.

14: Second hydraulic valve (valve device)
20: Hydraulic actuator 21: Cylinder (housing)
21B: Stepped part (regulation part)
22: 1st hydraulic chamber 23: 2nd hydraulic chamber 24: 3rd hydraulic chamber 26A: Step part (regulation part)
27: Restriction part 27A: End face 30: Piston rod 31: Piston 40: Stopper piston (movement restriction means)
41: Base part 42: Guide part 42A: Tip surface PN: Neutral position W1: First movement direction (movement direction)
W2: Second moving direction (moving direction)
110: Flap 120: Spoiler R: Overlap area DF: Flap drive range DS: Spoiler drive range

Claims (5)

A hydraulic actuator for driving a spoiler,
A piston rod for driving the spoiler;
In the overlap region where the drive range of the flap and the drive range of the spoiler overlap, and in the neutral position which is the position of the spoiler when the aircraft cruises, the piston rod in the direction in which the spoiler approaches the flap A hydraulic actuator comprising: movement restriction means capable of restricting movement. A housing in which the piston of the piston rod is housed and partitioned by the piston in a first hydraulic chamber for generating hydraulic pressure for lowering the spoiler and a second hydraulic chamber for generating hydraulic pressure for raising the spoiler With
The movement restricting means includes a stopper piston that divides the second hydraulic chamber and the third hydraulic chamber in the housing, and the stopper piston when the first hydraulic chamber and the third hydraulic chamber communicate with each other by a valve device. Restricting the movement of the piston rod based on the relationship between the force received from the hydraulic pressure of the third hydraulic chamber and the force received by the piston from the hydraulic pressure of the first hydraulic chamber,
The hydraulic actuator according to claim 1, wherein an area of the stopper piston that receives the hydraulic pressure of the third hydraulic chamber is larger than an area of the piston that receives the hydraulic pressure of the first hydraulic chamber. The hydraulic actuator according to claim 2, wherein the piston is in contact with an outer peripheral portion of the stopper piston in a moving direction of the piston. 3. A restricting portion that restricts movement of the stopper piston in a direction in which the third hydraulic chamber is expanded by contacting a portion on the inner side of the outer peripheral portion of the stopper piston in the movement direction of the stopper piston. Or the hydraulic actuator of 3. A restriction portion for restricting movement of the stopper piston in a direction of expanding the third hydraulic chamber;
The stopper piston includes a flat plate-like base portion that can come into contact with the restriction portion, and a guide portion that extends from the base portion in the movement direction of the stopper piston and guides the movement of the stopper piston in the movement direction,
The front end surface of the guide portion is located closer to the second hydraulic chamber side than the end surface on the third hydraulic chamber side in the restricting portion when the base portion comes into contact with the restricting portion. A hydraulic actuator according to claim 1.