JP2020063822A - Actuator - Google Patents

Abstract

To provide an actuator which can release locking without the usage of hydraulic pressure.SOLUTION: An actuator A includes: a cylinder 1; a piston 2 which is slidably inserted in the cylinder 1 and has a plurality of holes 2c penetrating through cylinders 2b, 2b in a radial direction; a piston rod 3 which is movably inserted in the cylinder 1 and is connected to the piston 2; a plurality of lock segments 4 which are inserted in the holes 2c and are radially movable with respect to the piston 2; a race 5 which presses the lock segment 4 when being positioned in a lock position so that the lock segment 4 projects outward from the piston 2, and which allows movement of the lock segment 4 into the piston 2 when being positioned in a release position; a race spring 6 which energizes the race 5 to a direction separating from the piston 2; and a stopper S which fixes the race 5 in the lock position, and releases the fixing of the race 5 when pressing force is applied.SELECTED DRAWING: Figure 1

Description

  The present invention relates to actuators.

  In aircraft, in order to ensure the minimum hydraulic pressure and power required for maneuvering in case of failure of both the main engine and auxiliary engine, a propeller that is deployed outside the aircraft and rotated by wind force is installed and equipped with a hydraulic pump or generator. It is equipped with a ram air turbine that drives the machine.

  When the ram air turbine is deployed outside the machine, a telescopic actuator is used, and the ram air turbine can be expanded from the inside of the machine to the outside of the machine by extension of the actuator. The actuator used for such an application has a lock mechanism for maintaining a contracted state because it is necessary to keep the ram air turbine housed in the machine in normal times.

  Specifically, the actuator includes a cylinder having a tapered surface at one end, a cylindrical piston slidably inserted into the cylinder, and a piston rod movably inserted into the cylinder and connected to the piston. A lock segment slidably fitted in a plurality of holes penetrating the piston in the radial direction and movable in the radial direction with respect to the piston; and a lock segment inserted in the piston so as to be movable in the axial direction. A lock piston having a tapered surface that abuts the inner surface of the lock piston, and a coil spring that biases the lock piston toward a position where the lock segment projects from the piston (see, for example, Patent Document 1).

  In the actuator configured as described above, when the hydraulic pressure is not applied to the lock piston, the lock piston is positioned by the coil spring so as to project outward from the piston so that the lock segment projects outward from the piston. Push it into contact with the cylinder end face. In this state, even if the piston tries to move with respect to the cylinder, the lock segment is abutted against the cylinder, so that the extension of the actuator is hindered and the lock state becomes inextensible. On the other hand, when hydraulic pressure is applied to the lock piston and the lock piston is pushed into the piston against the biasing force of the coil spring, the lock segment provided on the lock piston can enter the piston. In this state, when the piston is pushed by the action of hydraulic pressure and moves with respect to the cylinder, the lock segment is pushed into the piston by the taper surface of the cylinder end with this movement, and the piston can freely move with respect to the cylinder. .

Japanese Patent Publication No. 2006-520880

  In the conventional actuator, since the actuator is unlocked by using the hydraulic pressure as described above, the actuator cannot be unlocked in a situation where the hydraulic pressure is limited or unavailable.

  Therefore, an object of the present invention is to provide an actuator that can release the lock without using hydraulic pressure.

  In order to achieve the above-mentioned object, an actuator of the present invention includes a cylinder having a cylinder-side tapered surface that is inclined toward the inner peripheral side at one end, and is slidably inserted into the cylinder and has a cylindrical portion and a cylindrical portion at the tip. A piston having a plurality of holes provided on the same circumference and penetrating the cylinder portion in the radial direction, a piston rod movably inserted into the cylinder and connected to an end of the piston opposite to the cylinder portion, and a hole Has a plurality of lock segments that can be moved in the radial direction with respect to the piston, and a race-side tapered surface that can move in the axial direction with respect to the piston and that abuts against the lock segment on the outer circumference, When it is positioned at the lock position, the lock segment is pushed to project outward from the piston to face the cylinder end, and is separated from the piston and positioned at the release position. And a race that allows the lock segment to move into the piston, a race spring that urges the race away from the piston, and a race that opposes the urging force of the race spring to lock the race in the locked position and press it. It is equipped with a stopper that releases the fixation of the race 5 when receiving the race.

  In the actuator thus configured, when the stopper for fixing the race is pressed, the actuator can be switched from the non-extendable locked state to the extendable released state.

  Further, the actuator is provided with a ram that is axially movably inserted into the cylinder and is urged by a race spring in a direction away from the cylinder, and a tip of the ram abuts against a stopper. The stopper is attached to the arm, which is rotatable in front of the ram and laterally displaced from the ram movement axis, and is mounted rotatably to the ram side of the fulcrum of the arm so that the outer circumference is When the race is in a fixed position, the ram has a disk-shaped yoke that abuts against the ram, and the ram is on the cylinder outer side of the imaginary line connecting the fulcrum of the arm and the rotation axis of the yoke on the outer circumference of the yoke. It may be in contact. According to the actuator thus configured, even if the ram is biased by the race spring, the stopper can reliably prevent the ram from being separated from the piston, and the race can be fixed to the lock position even when disturbance is input to the actuator. .

  Further, the actuator may be provided with a return spring for urging the yoke in the direction of approaching the movement axis of the ram. When the actuator is configured in this way, when the pressing force is lost and the extended actuator is contracted, The actuator can be returned to the locked state.

  Further, the actuator may include a push-type solenoid that presses the arm when energized, and the distance between the pressing point at which the solenoid presses the arm and the fulcrum may be longer than the distance between the contact point and the fulcrum of the ram and the yoke. . In the actuator configured as described above, when the yoke is rotated around the fulcrum and unlocked by facing the biasing force of the race spring, the force that the solenoid should exert on the pressing point is small, and the small size is achieved. Since a solenoid can be used, the cost can be reduced and the weight can be reduced.

  Further, since the actuator is provided with the spring for urging the piston rod in the direction of withdrawing from the cylinder, the actuator can be extended even in an environment where the use of hydraulic pressure is limited or impossible. It is most suitable for the deployment application. It should be noted that the actuator may be configured to extend by utilizing hydraulic pressure.

  According to the actuator of the present invention, the lock can be released without using hydraulic pressure.

It is a longitudinal cross-sectional view of the actuator in one embodiment. It is a cross-sectional view of a piston in one embodiment. It is a partially expanded longitudinal cross-sectional view of the actuator in one embodiment of the locked state. It is a partially expanded longitudinal cross-sectional view of the actuator in one embodiment of the released state.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 1, an actuator A according to one embodiment includes a cylinder 1, a piston 2 slidably inserted into the cylinder 1, a movable insertion into the cylinder 1, and a connection to the piston 2. And a plurality of lock segments 4 which are inserted into a plurality of holes 2c provided in the piston 2 and are movable in the radial direction with respect to the piston 2, and are movable in the axial direction with respect to the piston 2. A race 5 that abuts the inner surface of the lock segment 4, a race spring 6 that urges the race 5, a stopper S that fixes the race 5 at a fixed position and that releases the fixation of the race 5 when a pressing force is applied, and energization A push-type solenoid 7 that sometimes presses the stopper S is provided.

  Hereinafter, each part of the actuator A will be described in detail. The cylinder 1 is tubular and has a cylinder-side tapered surface 1a that is inclined toward the inner peripheral side at one end that is the right end in FIG. The other end of the cylinder 1, which is the left end in FIG. 1, is closed by an annular rod guide 8, and a head end 9 is attached to the outer periphery of one end of the cylinder 1. The head end 9 has a bottomed tubular shape including a head end bottom portion 9a and a head end tubular portion 9b mounted on the outer circumference of the cylinder 1. The head end bottom portion 9a is used to attach the actuator A to a device. It is provided with a bracket 9c that enables it. Further, the inner peripheral diameter of the left end of the head end tubular portion 9b in the head end 9 is enlarged, and a step portion 9d is formed on the inner peripheral side. Further, a stopper S is housed in the head end 9.

  An outer tube 10 that covers the outer circumference of the cylinder 1 is attached to the left end of the head end tubular portion 9b of the head end 9 in FIG. An annular gap between the outer tube 10 and the cylinder 1 is communicated with the cylinder 1 by an orifice 1b provided on the left end side of the cylinder 1 in FIG. 1, and is communicated with a tank (not shown) through the head end 9. ing. A flange 1c is provided on the outer periphery on the right end side in FIG. 1 of the cylinder 1, and a flange 10a is also provided on the outer periphery on the right end side in FIG. 1 of the outer tube 10, and the flange 10a is superposed on the flange 1c. The cylinder 1 and the outer tube 10 are fastened to the head end 9 by bolts B after being stacked on the step portion 9 d provided on the inner peripheral side of the head end tubular portion 9 b.

  Further, a cylindrical shell 20 is attached to the outer circumference of the head end cylindrical portion 9b of the head end 9, and the shell 20 covers the outer circumference of the outer tube 10 and forms a spring, which will be described later, between the outer tube 10 and the outer tube 10. An annular gap that accommodates 12 is formed.

  The piston 2 is slidably inserted into the cylinder 1 and defines an oil chamber O in the cylinder 1 which communicates with the annular gap via the orifice 1b. Specifically, as shown in FIGS. 1 and 2, the piston 2 includes a bottom portion 2a, a cylinder portion 2b provided on the tip end side which is the right end of the bottom portion 2a in FIG. 1, and the cylinder portion 2b on the same circumference. It is provided with a plurality of holes 2c which are arranged at intervals and penetrate the tubular portion 2b in the radial direction. A piston rod 3 that is movably inserted into the cylinder 1 is connected to the left end in FIG. 1, which is the end of the bottom portion 2a of the piston 2 opposite to the cylindrical portion.

  The piston rod 3 projects to the outside of the cylinder 1 through the inner periphery of the rod guide 8, and the left end in FIG. 1 is provided with a bracket 11a that allows the actuator A to be attached to a device. There is. The piston rod 3 and the piston 2 may be integrally formed as shown in FIG. 1 or may be composed of divided parts.

  The rod end 11 includes a cylindrical cover 11b that is in sliding contact with the outer circumference of the shell 20 mounted on the outer circumference of the head end cylinder portion 9b of the head end 9. A spring 12 is housed in an annular space between the shell 20 and the outer tube 10. The spring 12 is interposed between the rod end 11 and an annular spring receiver 20a provided on the inner circumference of the shell 20, and attaches the piston 2 and the piston rod 3 to the cylinder 1 to the left in FIG. I am energetic. Therefore, the actuator A is constantly urged in the extension direction by the spring 12.

  Returning to FIG. 1 and FIG. 2, the holes 2c of the piston 2 are radially formed along the radial direction of the piston 2, and the lock segments 4 are formed in the holes 2c with respect to the piston 2. It is inserted so that it can move in the radial direction. In the present embodiment, the hole 2c has a rectangular cross section, and the lock segment 4 also has a rectangular cross section that matches the cross section of the hole 2c. The lock segment 4 is inserted into the hole 2c. Guided by the cylindrical portion 2b of the piston 2, the piston 2 can move in the radial direction. Therefore, the lock segment 4 can have its outer end projected to the outside of the piston 2 in FIG. The cross-sectional shape of the hole 2c and the lock segment 4 may be any shape other than a perfect circle, as long as the movement of the lock segment 4 with respect to the piston 2 in a direction other than the radial direction is restricted.

  In this example, the lock segment 4 is formed in a substantially rectangular parallelepiped shape, and is inclined to face the cylinder-side tapered surface 1a as if the corner of the outer end on the left side in FIG. It has an outer taper surface 4a and an inner taper surface 4b that inclines as if the corner of the inner end on the right side in FIG. Further, when the actuator A is viewed from the axial direction, the outer end of the lock segment 4 is an arcuate surface so as to be flush with the outer peripheral surface of the piston 2, and the inner end of the lock segment 4 also passes through the outer end surface. It is an arcuate surface cut by a circle that is concentric with the circle.

  In this document, the inner end of the lock segment 4 refers to an end facing the inner side of the piston 2 with respect to the piston 2, and the outer end of the lock segment 4 refers to the outer side of the piston 2 with respect to the piston 2. Says the facing end. In this example, four lock segments 4 are provided, but at least two or more may be provided.

  In addition, a rod-shaped ram 13 is axially movably inserted into the cylindrical portion 2b of the piston 2. As shown in FIG. 3, the ram 13 includes a spherical head portion 13a on the side opposite to the piston, which is the tip, a hollow portion 13b opening from the base end side, and a flange 13c protruding from the base end outer circumference to the outer circumference side. A stepped portion 13d having a small outer diameter on the tip end side and through holes 13e and 13f which are opened from the side and communicate with the hollow portion 13b are provided. Then, the ram 13 is biased by the race spring 6 in a direction projecting outward from the cylindrical portion 2b of the piston 2.

  The race spring 6 is housed in the hollow portion 13b of the ram 13, is interposed between the bottom portion 2a of the piston 2 and the ram 13, and urges the ram 13 in a direction in which it is separated from the piston 2 in the axial direction. is doing. Further, a spring bearing 2d is provided in the middle of the cylinder portion 2b of the piston 2, and the ram 13 is attached between the spring bearing 2d and the flange 13c of the ram 13 in the direction of pulling the ram 13 into the cylinder portion 2b of the piston 2. A biasing adjustment spring 14 is interposed. In this way, the ram 13 is positioned at a position where the urging forces of the race spring 6 and the adjustment spring 14 are balanced. If the spring bearing 2d is used not as a spring bearing but as a stopper for positioning the position of the ram 13, the position where the ram 13 is separated from the piston 2 by maximum contact with the flange 13c of the spring bearing 2d can be determined. The adjusting spring 14 may be omitted.

  Since the ram 13 has the flange 13c slidably contacting the inner circumference of the tubular portion 2b and is inserted and guided by the inner circumference of the spring bearing 2d, the ram 13 does not move axially with respect to the piston 2 and moves in the axial direction. it can. Further, the space formed between the ram 13 and the cylinder portion 2b of the piston 2 is communicated with the outside of the piston 2 by the through holes 13e and 13f, and the pressure in the space does not fluctuate greatly when the ram 13 moves. Therefore, care is taken so that the movement of the ram 13 is not hindered.

  An annular race 5 is attached to the outer circumference of the ram 13. Specifically, the race 5 is fixed to the ram 13 by a nut 19 and a step portion 13d screwed to the outer periphery of the ram 13 on the tip side. The race 5 is substantially frustoconical and has a race-side tapered surface 5a that is inclined toward the outer circumference and faces the inner tapered surface 4b of the lock segment 4 and is always in contact therewith.

  Since the race 5 is fixed to the ram 13, it can be moved in the axial direction with respect to the piston 2 like the ram 13, and is separated from the piston 2 by the race spring 6 via the ram 13. Is urged to. The outer periphery of the race 5 is in the range between the inner end and the outer end of the lock segment 4 when viewed from the axial direction, and the race 5 approaches the piston 2 against the biasing force of the race spring 6. The race-side tapered surface 5a is pressed against the inner tapered surface 4b of the lock segment 4. In this state, when the lock segment 4 is located further to the right in FIG. 1 than the end portion of the cylinder 1, the lock segment 4 pushed by the race 5 moves into the hole 2c of the piston 2 in the piston 2 as shown in FIG. It moves toward the outer peripheral side of 2 to project the outer end to the outside of the piston 2 so as to face the end of the cylinder 1 in the axial direction. In this way, when the lock segment 4 faces the end of the cylinder 1 in the axial direction, when the piston 2 tries to move to the left in FIG. 3, the lock segment 4 abuts against the end of the cylinder 1 and the piston 2 moves. Hinder the movement of. Therefore, when the race 5 approaches the piston 2 as shown in FIG. 3 and is positioned at the lock position where the lock segment 4 is pushed outward from the piston 2, the actuator A enters a non-extendable locked state.

  On the other hand, when the race 5 moves in the direction away from the piston 2, there is room for entering the inside of the lock segment 4 by the amount of the movement of the race 5. In this state, the lock segment 4 is allowed to move inward of the piston 2. Therefore, as shown in FIG. 4, when the piston 2 moves to the left in FIG. A force is applied to 4 from the cylinder-side tapered surface 1 a that abuts the outer tapered surface 4 a of the lock segment 4 toward the inside of the piston 2. Therefore, in this state, when the piston 2 moves leftward in FIG. 4 with respect to the cylinder 1, the lock segment 4 is pushed into the piston 2 by the cylinder 1, so that the lock segment 4 collides with the end of the cylinder 1. After that, the piston 2 can move to the left in FIG. 4 with respect to the cylinder 1. Therefore, when the race 5 is separated from the piston 2 as shown in FIG. 4 and is positioned at the release position where the lock segment 4 is allowed to move inwardly of the piston 2, the actuator A is in the extendable release state. Becomes It is useful to provide the outer tapered surface 4a and the inner tapered surface 4b of the lock segment 4 because the above-described operation of the lock segment 4 can be performed reliably and smoothly, but it is also possible to omit these tapered surfaces 4a and 4b. is there.

  Subsequently, the stopper S is housed in the head end cylinder portion 9b of the head end 9. Specifically, the stopper S is rotatable about a position in front of the ram 13 (left side in FIG. 3) and laterally (upward in FIG. 3) displaced from the moving axis X of the ram 13 as a fulcrum F. An arm 15 attached to the head end 9, a disk-shaped yoke 16 rotatably attached to the ram 13 side of the fulcrum of the arm 15 and having an outer periphery abutting the head 13a of the ram 13, and the arm 15 And a return spring 17 which is connected to the head end 9 and biases the yoke 16 in the direction of approaching the moving axis of the ram 13.

  In the present embodiment, the arm 15 is bent in the center, and one end of the arm 15 can rotate along the paper surface in FIG. 3 with the shaft 18 provided on the head end 9 as a fulcrum F. A rotary shaft 15a is provided in the middle of the arm 15 to rotatably mount the yoke 16, and the yoke 16 has a disk shape and can rotate around the rotary shaft 15a around the rotary shaft 15a. Further, the yoke 16 can rotate in the horizontal direction within the plane including the moving axis of the ram 13 about the fulcrum F by the rotation around the fulcrum F of the arm 15.

  The other end of the arm 15 is in contact with the plunger 7a of the push-type solenoid 7 mounted on the side of the head end cylinder portion 9b of the head end 9. In the state shown in FIG. 3, the plunger 7a of the solenoid 7 is in the most buried state in the solenoid main body 7b, and cannot enter the solenoid main body 7b any more. When the solenoid 7 is energized, the solenoid 7 drives the plunger 7a in a direction projecting from the solenoid body 7b, and exerts a thrust force for pressing the arm 15 clockwise around the fulcrum F in FIG. The return spring 17 exerts a biasing force in the pulling direction in which the other end of the arm 15 is pulled rightward in FIG. 3, and the arm 15 is rotated counterclockwise in FIG. 3 about the fulcrum F. Then, the other end of the arm 15 is always kept in contact with the plunger 7a of the solenoid 7.

  The head 13a of the ram 13 is in contact with the outer periphery of the yoke 16, and in the state where the race 5 shown in FIG. 3 is in the lock position for projecting the lock segment 4 to the outside of the piston 2, the ram 13 is formed. The head portion 13a is a portion of the outer circumference of the yoke 16 that is closer to the cylinder 1 than the imaginary line V that connects the fulcrum F of the arm 15 and the rotation shaft 15a of the yoke 16 (to the left of the imaginary line V in FIG. 3). To contact. When set in this way, the biasing force of the race spring 6 transmitted to the yoke 16 via the ram 13 acts in the direction of rotating the yoke 16 counterclockwise about the fulcrum F. On the other hand, the other end of the arm 15 is in contact with the plunger 7a of the solenoid 7, and in the state shown in FIG. 3, the plunger 7a cannot further enter into the solenoid body 7b, so the ram 13 is shown in FIG. It cannot be moved to the right from the state and is fixed on the spot.

  When the ram 13 is thus fixed by the stopper S, the race A is positioned in the lock position for pushing the lock segment 4 so as to project to the outside of the piston 2, so that the actuator A is kept in the non-extendable locked state. It

  On the other hand, when the solenoid 7 is energized to drive the plunger 7a and the arm 15 is pressed to rotate clockwise about the fulcrum F, the yoke 16 moves from the position shown in FIG. 3 to the position shown in FIG. Since it escapes upward in the figure, the race 5 together with the ram 13 is pushed out by the race spring 6 in the direction away from the piston 2 as shown in FIG. Then, the race 5 is positioned at the release position, and the movement of the lock segment 4 into the piston 2 is permitted, so that the actuator A can extend. The piston 2 is moved leftward in FIG. 4 with respect to the cylinder 1 by the urging force of the spring 12, and the lock segment 4 is pushed by the cylinder side taper surface 1 a of the cylinder 1 to be housed in the piston 2 and the actuator 2 A extends.

  When the energization of the solenoid 7 is stopped after unlocking the actuator A, the arm 15 is returned to the original position shown in FIG. 3 by the return spring 17, and the actuator A is contracted in that state. Then, the head 13a of the ram 13 comes into contact with the outer periphery of the yoke 16 to push the ram 13 into the piston 2 and position the race 5 at the lock position. Then, the lock segment 4 pushed by the race 5 projects outward of the piston 2 and axially faces the end portion of the cylinder 1, and the actuator A is again locked in a non-expandable state.

  When the actuator A is extended by the urging force of the spring 12, the oil chamber O is compressed by the piston 2 and the working oil in the oil chamber O is stored in the orifice 1b provided in the cylinder 1 and the cylinder 1 and the outer. It is discharged to a tank (not shown) through the annular gap between the tube 10. Since the orifice 1b gives resistance to the flow of the hydraulic oil in the oil chamber O discharged to the tank, the extension speed of the actuator A becomes slow and the sharp extension is suppressed. Therefore, the actuator A is optimal for use in deploying the ram air turbine outside the aircraft. As described above, since the spring 12 that urges the piston rod 3 in the direction of retracting from the cylinder 1 is used for the extension operation of the actuator A, even if the use of hydraulic pressure is restricted or disabled, the ram air turbine is used. Can be deployed outside the aircraft. The actuator A may of course be used for purposes other than the deployment of the ram air turbine of an aircraft.

  As described above, the actuator A of the present invention includes the cylinder 1 having the cylinder-side tapered surface 1a inclined toward the inner peripheral side at one end, the cylinder 1 slidably inserted into the cylinder 1, and the cylinder portion 2b at the tip. A piston 2 having a plurality of holes 2c provided on the same circumference of the portion 2b and penetrating the tubular portion 2b in the radial direction, and a piston 2 movably inserted into the cylinder 1 and at the end of the piston 2 opposite to the tubular portion. A piston rod 3 to be connected, a plurality of lock segments 4 inserted into the holes 2c and movable in the radial direction with respect to the piston 2, and a lock segment 4 movable in the axial direction with respect to the piston 2 and provided on the outer periphery. Has a race-side tapered surface 5a that abuts against the piston 2, and when the piston 2 approaches the piston 2 and is positioned at the lock position, the lock segment 4 is pushed to project outward from the piston 2 and face the end of the cylinder 1. A race 5 that allows the lock segment 4 to move into the piston 2 when positioned apart from the piston 2 in the release position, a race spring 6 that urges the race 5 away from the piston 2, and a race 5 It is provided with a stopper S that fixes the race 5 in the locked position in opposition to the biasing force of the race spring 6 and releases the fixation of the race 5 when a pressing force is applied.

  In the actuator A configured as described above, when the stopper S that fixes the race 5 is pressed, the actuator A can be switched from the non-extendable locked state to the extendable released state. Therefore, according to the actuator A of the present invention, the lock can be released without using the hydraulic pressure.

  Further, since the actuator A can be unlocked by pressing the stopper S, the push solenoid 7 can be used for unlocking, and the structure of the stopper S is not only simple, but also manually locked. It can be released easily.

  Further, the actuator A according to the present embodiment has a ram 13 which is inserted into the cylinder 1 so as to be movable in the axial direction and is urged by the race spring 6 in a direction away from the cylinder 1 and the tip of which contacts the stopper S. The race 5 has an annular shape and is attached to the outer periphery of the ram 13, and the stopper S has an arm 15 which is rotatable in front of the ram 13 and laterally displaced from the movement axis of the ram 13 as a fulcrum F. And a disk-shaped yoke 16 that is rotatably mounted on the ram 13 side of the fulcrum F of the arm 15 and has an outer periphery abutting against the ram 13. When the race 5 is in the fixed position, the ram 13 is The cylinder 1 is in contact with the outer periphery of the yoke 16 with respect to an imaginary line V connecting the fulcrum F of the arm 15 and the rotation shaft 15a of the yoke 16. According to the actuator A configured as described above, even if the ram 13 is biased by the race spring 6, the stopper S can reliably prevent the ram 13 from separating from the piston 2, and even if a disturbance is input to the actuator A. The race 5 can be fixed in the locked position.

  Further, since the actuator A of the present embodiment is provided with the return spring 17 for urging the yoke 16 in the direction of approaching the moving axis of the ram 13, when the force pressing the stopper S is lost, the stopper S races. 5 can be automatically returned to the position where it is positioned at the lock position. Therefore, when the actuator A that has expanded by contracting the pressing force is contracted, the actuator A can automatically return to the locked state.

Furthermore, as shown in FIG. 3, the actuator A of the present embodiment includes a push-type solenoid 7 that presses the arm 15 when energized, and the distance L between the pressing point P and the fulcrum F where the solenoid 7 presses the arm 15. _FP is longer than the distance L _FT between the fulcrum F and the contact point T between the ram 13 and the yoke 16. In the actuator A configured as described above, when the yoke 16 is rotated around the fulcrum F and unlocked by opposing the biasing force of the race spring 6, the force that the solenoid 7 should exert on the pressing point P is The solenoid 7 that is small and small can be used, which can reduce the cost and contribute to the weight reduction.

  Further, since the actuator A of the present embodiment is provided with the spring 12 that biases the piston rod 3 in the direction of retracting from the cylinder 1, the extension operation can be performed even in an environment where the use of hydraulic pressure is restricted or impossible. This makes it ideal for ram air turbine deployment applications in aircraft. It should be noted that the actuator A may be configured to extend by using hydraulic pressure.

  The preferred embodiments of the present invention have been described above in detail, but modifications, variations, and changes can be made without departing from the scope of the claims.

1 ... Cylinder, 1a ... Cylinder side taper surface, 2 ... Piston, 2b ... Cylindrical part, 2c ... Hole, 3 ... Piston rod, 4 ... Lock segment, 5 ... ..Race, 5a ... Tapered surface on race side, 6 ... Race spring, 7 ... Solenoid, 12 ... Spring, 13 ... Ram, 15 ... Arm, 15a ... Rotating shaft , 16 ... Yoke, 17 ... Return spring, A ... Actuator, F ... Support point, P ... Push point, S ... Stopper, T ... Contact point, V ... Virtual line

Claims (5)

A cylinder having a cylinder-side tapered surface that inclines toward the inner peripheral side at one end,
A piston that is slidably inserted into the cylinder, has a tubular portion at the tip, and a plurality of holes that are provided on the same circumference of the tubular portion and that radially pass through the tubular portion,
A piston rod movably inserted into the cylinder and connected to an end of the piston opposite to the cylindrical portion;
A plurality of lock segments inserted into the hole and movable in the radial direction with respect to the piston;
The race side taper surface which is movable in the axial direction with respect to the piston and contacts the lock segment is provided on the outer periphery, and when the piston is approached to the piston and positioned at the lock position, the lock segment is pushed to push the piston. A race that allows the lock segment to move into the piston when positioned away from the piston and in the release position.
A race spring that biases the race in a direction away from the piston,
An actuator, comprising: a stopper that fixes the race in a locked position in opposition to the biasing force of the race spring and that releases the fixation of the race when a pressing force is applied. A ram that is axially movably inserted into the cylinder and is urged by the race spring in a direction away from the cylinder and has a tip abutting against a stopper;
The race is annular and is attached to the outer periphery of the ram,
The stopper is an arm rotatable about a position in front of the ram and laterally displaced from the moving axis of the ram, and an arm rotatably mounted on the ram side of the fulcrum of the arm so that the outer circumference is A disk-shaped yoke that is in contact with the ram,
When the race is in a fixed position, the ram is in contact with the outer circumference of the yoke and closer to the cylinder than an imaginary line connecting the fulcrum of the arm and the rotation axis of the yoke. The actuator according to claim 1. The actuator according to claim 2, further comprising a return spring that urges the yoke in a direction of approaching the moving axis of the ram. Equipped with a push-type solenoid that presses the arm when energized,
The actuator according to claim 2 or 3, wherein a distance between a pressing point at which the solenoid pushes the arm and the fulcrum is longer than a distance between a contact point between the ram and the yoke and the fulcrum. The actuator according to any one of claims 1 to 4, further comprising a spring that biases the piston rod in a direction in which the piston rod is retracted from the cylinder.

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