JP2014145452A - Electric actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric actuator capable of retreating an output part to a position contracted against a housing even when a fixed state is generated in a screw mechanism and capable of simplifying and downsizing a structure.SOLUTION: The electric actuator includes: an electric motor 13; a housing 11, a first screw 22 to which driving force from the electric motor 13 is inputted; a second screw 23 coupled to an output part 12; a support part 16; a linkage mechanism 17; and a release mechanism 18. The second screw 23 is arranged so as to be relatively displaced from the first screw 22 in an axial direction by relative rotation. The support part 16 rotatably supports the second screw 23. The linkage mechanism 17 regulates relative displacement of the support part 16 with respect to the housing 11 in a linear state. When the release mechanism is actuated, the linkage mechanism 17 is turned to a curved state so as to permit the relative displacement of the support part 16 with respect to the housing 11.

Description

  The present invention relates to an electric actuator that has a screw mechanism and converts a rotational driving force output by an electric motor into a linear driving force and outputs the linear driving force.

  Conventionally, electric actuators having an electric motor and a screw mechanism have been used in various fields such as aircraft. Such an electric actuator converts a rotational driving force output by the electric motor into a linear driving force by a screw mechanism and outputs the linear driving force. And this electric actuator drives various apparatus by displacing so that an output part may expand and contract along a linear direction with respect to a housing. The electric actuator has an advantage that the maintenance burden is less than that of a hydraulic actuator that operates when pressure oil is supplied.

  The electric actuator described above may have a fixed state (jammed state) in the screw mechanism due to causes such as prying or seizure. When a sticking state occurs in the electric actuator, it is difficult to retract the output portion to the contracted position with respect to the housing.

  Patent Document 1 discloses an electric actuator provided with a first actuator and a second actuator. The first actuator and the second actuator are installed so as to extend in opposite directions on the coaxial line. Each of the first actuator and the second actuator includes an electric motor and a ball screw mechanism. Thereby, even if this electric actuator is a case where the fixation state generate | occur | produces in the screw mechanism in one of the 1st and 2nd actuators, the other of the 1st and 2nd actuators can be operated. It is. For this reason, in this electric actuator, even when the above-described fixed state occurs, the output portion can be retracted to a position contracted with respect to the housing.

US Pat. No. 5,214,972

  However, the electric actuator disclosed in Patent Document 1 requires a double actuator provided to extend in the opposite direction on the same axis. Further, each of the double actuators requires an electric motor and a screw mechanism. For this reason, this electric actuator has a complicated structure and an increased size. In addition, the electric actuator increases in weight as the structure becomes larger.

  In view of the above circumstances, the present invention makes it possible to retract the output portion to a contracted position with respect to the housing even when a fixed state occurs in the screw mechanism. An object of the present invention is to provide an electric actuator that can be miniaturized.

  In order to achieve the above object, an electric actuator according to an aspect of the present invention includes an electric motor, a housing, an output portion that protrudes relative to the housing and is capable of relative displacement, and at least a part of the housing. A first screw to be housed and a cylindrical portion on which the first screw is installed; and the first screw is attached to the first screw so as to be relatively rotatable about the axis of the first screw. A second screw that is relatively displaceable in the axial direction by rotating relative to the first screw, a support portion that rotatably supports one of the first screw and the second screw, and a plurality of link members And connecting the support portion and the housing, and a plurality of the link members connected to each other extend in a straight line. Comprises said supporting portion of the restriction can link mechanism relative displacement with respect to the housing, and a release mechanism capable release the restriction of the relative displacement of the supporting part relative to the housing by the link mechanism. In the electric actuator according to an aspect of the present invention, a driving force from the electric motor is input to one of the first screw and the second screw, and the other of the first screw and the second screw is The link mechanism is connected to the output portion, and one end portion of the link mechanism is rotatably connected to the support portion, and the other end portion is rotatably connected to the housing. When the release mechanism is actuated, the support portion is bent at a connection position of the plurality of linked members so as to allow relative displacement of the support portion with respect to the housing, or the plurality of link members are connected. It is in a disconnected state.

  According to this configuration, in a state where the release mechanism is not operated, the relative displacement of the support portion with respect to the housing is restricted by the linearly extending link mechanism. And the driving force from an electric motor is input into the screw mechanism which has a 1st and 2nd screw. In this screw mechanism, the rotational driving force output by the electric motor is converted into a linear driving force. The driving force converted by the screw mechanism is output from the output unit. Thereby, an electric actuator displaces an output part so that it may expand and contract along a linear direction to a housing, and drives various devices.

  On the other hand, when a fixed state occurs in the screw mechanism, that is, when a fixed state occurs between the first screw and the second screw, the release mechanism is activated. When the release mechanism is actuated, the link mechanism is bent or a plurality of link members are disconnected. And the relative displacement with respect to the housing of the support part which supports a screw mechanism is accept | permitted. Thereby, the screw mechanism can be displaced together with the support portion in the direction in which the distance between the one end portion and the other end portion of the link mechanism becomes smaller with respect to the housing. For this reason, when an external force acts on the output part, the output part can be displaced along with the support part and the fixed screw mechanism toward the direction of contraction with respect to the housing. Therefore, according to said structure, even if it is a case where the adhering state generate | occur | produces in a screw mechanism, it becomes possible to retract | save the output part to the position contracted with respect to the housing. Further, the structure for retracting the output unit as described above is realized by a small and simple structure including the support unit, the link mechanism, and the release mechanism. For this reason, simplification and size reduction of the structure of the electric actuator are achieved.

  Therefore, according to the above configuration, the output portion can be retracted to the contracted position with respect to the housing even when a fixed state occurs in the screw mechanism, and the structure can be simplified and miniaturized. An electric actuator that can be realized can be provided.

  Further, the release mechanism includes a projecting portion supported so as to be displaceable so as to project from the housing side toward a connecting portion that is a portion to which the plurality of link members in the link mechanism are connected, and the projecting portion A projecting drive part that drives the projecting part to project toward the connecting part, and the projecting part is driven by the projecting driving part to project toward the connecting part, thereby The connecting portion is preferably biased so as to be bent.

  According to this structure, the protrusion part driven by the protrusion drive part protrudes toward the connection part of a link mechanism, and biases a connection part. As a result, the link mechanism is bent. Therefore, the release mechanism is realized by a small and simple structure that includes the protruding portion and the protruding drive portion.

  Moreover, it is preferable that the protrusion drive unit is provided as a solenoid, and the protrusion is provided as a plunger that protrudes from the solenoid toward the connecting portion when the solenoid is excited or demagnetized.

  According to this configuration, the release mechanism is realized by a small and simple structure including a solenoid and a plunger.

  The release mechanism includes a cam member that is rotatably supported and provided with an eccentric portion, and a rotation drive portion that rotationally drives the cam member. The eccentric portion is an outer periphery of the cam member. A part of the part that is formed such that the distance dimension from the rotational center position of the cam member to the outer peripheral position is larger than the other part of the outer peripheral part, and the rotational drive unit is operated It is also preferable that the eccentric portion urges a connecting portion that is a portion where the plurality of link members in the link mechanism are connected so that the link mechanism is bent as the cam member rotates.

  According to this configuration, the cam member driven by the rotation driving unit rotates, and the eccentric portion of the cam member biases the connecting portion of the link mechanism. As a result, the link mechanism is bent. Therefore, the release mechanism is realized by a small and simple structure including the cam member and the rotation drive unit.

  In addition, the release mechanism includes a pin member that penetrates through holes provided in each of the plurality of link members and connects the plurality of link members, and a pin member that is integrally provided or attached to the pin member. Connecting the plurality of link members by operating the operation unit such that the pin members are extracted from the through holes of the plurality of link members. It is also preferable that is in a disconnected state.

  According to this structure, a pin member is extracted from the through-hole of a some link member by operating an operation part. Thereby, connection of a some link member is cut off. Therefore, the release mechanism is realized by a small and simple structure including the pin member and the operation unit.

  In addition, the support portion is formed in a cylindrical shape, and the cylindrical structure portion in which one of the first screw and the second screw is disposed on the inner side, and the inner periphery of the cylindrical structure portion, It is preferable to have a bearing portion that rotatably supports one outer periphery of the first screw and the second screw.

  According to this structure, a support part is implement | achieved by the small and simple structure comprised including the cylindrical structure part and the bearing part. Moreover, according to said structure, the outer periphery of one side of a 1st and 2nd screw is supported via a bearing part with respect to the inner periphery of a cylindrical structure part. For this reason, one of the first and second screws can be stably supported.

  Further, the electric actuator has a connecting portion, which is a portion where the plurality of link members in the link mechanism are connected, in a state where relative displacement of the support portion with respect to the housing is restricted by the link mechanism. It is preferable to further include a spring member that applies torque to any of the plurality of link members so as to be pressed toward the center.

  According to this configuration, torque is applied to any one of the plurality of link members such that the connecting portion of the link mechanism is pressed toward the housing side by the spring member. For this reason, the simple structure in which the spring member is provided can easily maintain the state in which the relative displacement of the support portion with respect to the housing is regulated by the link mechanism.

  The spring member is provided as a coil spring, and when the release mechanism releases the restriction of the relative displacement of the support portion relative to the housing by the link mechanism, the coil spring is in a bent state. It is preferable that a torque having a magnitude corresponding to the amount of displacement displaced so that the connecting portion is separated from the housing is applied to any of the plurality of link members.

  According to this configuration, the spring member that applies torque to any of the plurality of link members is realized by a simple spring member configured as a coil spring. The coil spring applies a torque having a magnitude corresponding to the amount of displacement from the housing of the connecting portion to any of the plurality of link members after the releasing operation by the releasing mechanism. For this reason, when external force acts on an output part, it can control that an output part contracts rapidly to a housing. Thereby, it can suppress that a screw mechanism will move suddenly within a housing and a mechanical impact force will generate | occur | produce.

  According to the present invention, it is possible to retract the output portion to the contracted position with respect to the housing even when a fixed state occurs in the screw mechanism, and to simplify and miniaturize the structure. An electric actuator can be provided.

It is a mimetic diagram showing the state where the electric actuator concerning a 1st embodiment of the present invention was attached to the wing and moving blade of an airplane. FIG. 2 is a schematic diagram illustrating a state in which a moving blade is driven from the state illustrated in FIG. 1 by an electric actuator. It is a figure which shows typically the electric actuator shown in FIG. 1, Comprising: It is a figure containing the partial cross section of an electric actuator. It is a figure which expands and shows a part of FIG. It is a schematic diagram which shows the link mechanism and cancellation | release mechanism of the electric actuator shown in FIG. It is a schematic diagram which shows the state which the cancellation | release mechanism shown in FIG. 5 act | operated. It is a figure for demonstrating the action | operation of the electric actuator shown in FIG. It is a figure for demonstrating the action | operation of the electric actuator shown in FIG. It is a schematic diagram which shows the link mechanism and cancellation | release mechanism of an electric actuator which concern on 2nd Embodiment of this invention. It is a schematic diagram which shows the link mechanism and cancellation | release mechanism of an electric actuator which concern on 3rd Embodiment of this invention. It is a schematic diagram which shows the link mechanism and cancellation | release mechanism of an electric actuator which concern on 4th Embodiment of this invention. It is a schematic diagram which shows the link mechanism and cancellation | release mechanism of an electric actuator which concern on 5th Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following embodiment, an example in which an electric actuator is provided in a moving blade driving mechanism for driving a moving blade of an aircraft will be described. However, the present invention is not limited to the embodiments exemplified in the following embodiments, and can be widely applied. Specifically, the present invention can be widely applied to an electric actuator that has a screw mechanism and converts a rotational driving force output by an electric motor into a linear driving force and outputs the linear driving force.

(First embodiment)
FIG. 1 is a schematic view illustrating a state in which the electric actuator 1 according to the first embodiment of the present invention is attached to the wing 101 and the moving blade 102 of the aircraft. In FIG. 1, the main part of the aircraft is not shown. In FIG. 1, a part of the blade 101, the moving blade 102, and the moving blade 103 are schematically illustrated. In the present embodiment, the wing 101 is configured as a main wing of an aircraft. The moving blade 102 is configured as a spoiler. In the present embodiment, the moving blade 102 is configured as a device driven by the electric actuator 1. The moving blade 103 is configured as a flap. FIG. 1 schematically shows a state in which the rear end portion of the wing 101 is viewed from the left-right direction of the aircraft. In FIG. 1, only the outlines of the blade 101 and the moving blades (102, 103) are schematically illustrated.

[Rotating blade drive mechanism]
In describing the electric actuator 1, first, an aircraft moving blade drive mechanism 100, which is an example to which the electric actuator 1 is applied, will be described. A moving blade driving mechanism 100 shown in FIG. 1 is installed on a wing 101 of an aircraft. The moving blade driving mechanism 100 is used to drive the moving blade 102 of the aircraft. The moving blade driving mechanism 100 includes the electric actuator 1, the rotating shaft 104, and the swing shaft 105.

  The rotating shaft 104 is installed on the wing 101. Then, the end of the housing 11 of the electric actuator 1 is rotatably connected to the rotating shaft 104. As a result, the electric actuator 1 is supported by the blade 101 so as to be swingable about the rotation shaft 104.

  The swing shaft 105 is installed on the moving blade 102. And the end part of the output part 12 of the electric actuator 1 is rotatably connected to the moving blade 102. The moving blade 102 is rotatably supported with respect to the fulcrum shaft 106. The fulcrum shaft 106 is installed on the wing 101. Thereby, the moving blade 102 is supported by the blade 101 so as to be swingable about the fulcrum shaft 106.

  In the electric actuator 1, the output portion 12 is provided so as to protrude relative to the housing 11 and be relatively displaceable. That is, the output unit 12 is configured to be able to extend from the housing 11 by protruding from the housing 11. Further, the output unit 12 is configured to be capable of contracting with respect to the housing 11.

  FIG. 2 is a schematic diagram showing a state in which the moving blade 102 is driven from the state shown in FIG. 1 by the electric actuator 1 of the moving blade driving mechanism 100. FIG. 1 shows a state in which the output unit 12 is retracted to a position where it is most contracted with respect to the housing 11. On the other hand, FIG. 2 shows a state where the output portion 12 protrudes from the housing 11 and extends. As shown in FIGS. 1 and 2, the moving blade 102 is driven by the operation of the electric actuator 1. The moving blade 102 is driven to swing with respect to the blade 101 about the fulcrum shaft 106.

  In the control surface drive mechanism 100 shown in FIG. 1, a reaction link may be further provided. The reaction link is provided as a member that supports the reaction force from the moving blade 102 by the output when the output from the electric actuator 1 is output to the moving blade 102. The reaction link has one end connected to the rotary shaft 104 and the other end connected to the fulcrum shaft 106. By providing the reaction link, it is possible to prevent the load received by the movable-side moving blade 102 from directly affecting the fixed-side blade 101.

[Configuration of electric actuator]
FIG. 3 schematically shows the electric actuator 1 and includes a partial cross section of the electric actuator 1. As described above, the electric actuator 1 is configured as an actuator that drives the moving blade 102. As shown in FIG. 3, the electric actuator 1 includes a housing 11, an output unit 12, an electric motor 13, a gear mechanism 14, a screw mechanism 15, a support unit 16, a link mechanism 17, a release mechanism 18, a torsion spring 19, and a one-way. A clutch 20, a position detection mechanism 21, and the like are provided.

  The housing 11 is provided as a structure having an internal space. The housing 11 accommodates the gear mechanism 14, the screw mechanism 15, the support portion 16, and the like in its internal space. A connecting portion 11 a is provided at the end of the housing 11. The connecting portion 11a is rotatably connected to the rotating shaft 104 via a bearing or a bush that is a cylindrical sliding member. Thereby, the housing 11 is rotatably installed with respect to the wing 101 via the rotation shaft 104.

  The output unit 12 is provided as a part that outputs the driving force generated by the electric actuator 1 to the outside. The output unit 12 is fixed to an end portion of a first screw 22 described later in the screw mechanism 15. The output unit 12 is provided so as to protrude with the first screw 22 with respect to the housing 11. Thereby, the output part 12 is provided so that relative displacement with respect to the housing 11 is possible. Further, a connecting portion 12 a is provided at the distal end portion of the output portion 12. The connecting portion 12a is rotatably connected to the swing shaft 105 via a bearing or a bush that is a cylindrical sliding member.

  The electric motor 13 is configured as an electric motor capable of forward / reverse rotation. The electric motor 13 is subjected to feedback control based on, for example, a command from a controller for controlling the operation of the moving blade 102 (hereinafter also referred to as “moving blade control controller”). In the drawings, illustration of the controller for controlling the blades is omitted.

  The electric motor 13 is attached to the housing 11. The electric motor 13 is provided as a drive source that drives the output unit 12 with respect to the housing 11 via the gear mechanism 14 and the screw mechanism 15. The moving blade 102 is driven by driving the output unit 12 in accordance with the operation of the electric motor 13. That is, when the electric motor 13 operates, the electric actuator 1 operates. Then, the moving blade 102 is driven by the operation of the electric actuator 1.

  The gear mechanism 14 is provided as a mechanism for transmitting the driving force from the electric motor 13 to the screw mechanism 15. Then, the gear mechanism 14 temporarily increases or decreases the rotational driving force of the electric motor 13 and transmits it to the screw mechanism 15. In the present embodiment, a mode in which the rotational driving force of the electric motor 13 is once increased in the gear mechanism 14 and then transmitted to the screw mechanism 15 is illustrated.

  The gear mechanism 14 exemplified in the present embodiment includes a spur gear 14a and a spur gear 14b. The rotation shaft of the spur gear 14a and the rotation shaft of the spur gear 14b are arranged so as to extend in parallel. The spur gear 14a and the spur gear 14b are arranged so as to mesh with each other.

  The spur gear 14a is fixed to the end of the output shaft 13a of the electric motor 13 and is provided so as to rotate together with the output shaft 13a. That is, the output shaft 13a is also configured as a rotating shaft of the spur gear 14a. The output shaft 13a is rotatably supported with respect to the housing 11 via a bearing.

  The spur gear 14 b is installed in the housing 11 so as to mesh with the spur gear 14 a and also mesh with the second screw 23 in the screw mechanism 15. That is, the rotational driving force input from the electric motor 13 to the spur gear 14a is input to the spur gear 14b. The rotational driving force input to the spur gear 14 b is input to the second screw 23. In addition, each of the both ends of the rotating shaft of the spur gear 14b is rotatably supported with respect to the housing 11 via a bearing. The spur gear 14b is provided as a gear having a smaller diameter than the spur gear 14a. For this reason, the rotational driving force from the electric motor 13 is temporarily increased in the gear mechanism 14 and transmitted.

[Screw mechanism]
The screw mechanism 15 is provided as a mechanism that converts the rotational driving force output by the electric motor 13 into a linear driving force and outputs the linear driving force. FIG. 4 is an enlarged view of a part of FIG. As shown in FIGS. 3 and 4, the screw mechanism 15 includes a first screw 22, a second screw 23, a plurality of balls 24, and the like.

  The screw mechanism 15 is configured such that a driving force from the electric motor 13 is input to one of the first screw 22 and the second screw 23. Further, the screw mechanism 15 is configured such that the other of the first screw 22 and the second screw 23 is connected to the output unit 12. In the present embodiment, a configuration in which the driving force from the electric motor 13 is input to the second screw 23 and the first screw 22 is connected to the output unit 12 is illustrated.

  The first screw 22 is provided as a screw shaft member partially housed in the housing 11. The first screw 22 is provided as a cylindrical member having a space region formed therein. A position detection mechanism 21 to be described later is arranged in a space area inside the first screw 22. A spiral screw groove is provided on the outer periphery of the first screw 22.

  Further, one end of the first screw 22 is disposed so as to be exposed from the housing 11 to the outside. The output unit 12 is fixed to the end of the first screw 22 exposed from the housing 11. In addition, the screw part 12b is provided in the output part 12 in the edge part on the opposite side to the edge part in which the connection part 12a is provided. An insertion hole into which the screw shaft portion 12 b is inserted is formed at the end of the first screw 22. A male screw portion is provided on the outer periphery of the screw shaft portion 12b. On the other hand, a female screw portion that is screwed into the male screw portion of the screw shaft portion 12 b is provided on the inner periphery of the insertion hole at the end of the first screw 22. The output portion 12 is attached to the first screw 22 by screwing the female screw portion provided in the first screw 22 and the male screw portion provided in the screw shaft portion 12b. Further, a fixing nut 25 is attached to the screw shaft portion 12b in a state where the fixing nut 25 is screwed into the male screw portion of the screw shaft portion 12b. With the output portion 12 screwed into the first screw 22, the fixing nut 25 is tightened toward the first screw 22, whereby the output portion 12 is fixed to the first screw 22.

  The second screw 23 is accommodated in the housing 11. And the 2nd screw 23 is rotatably supported with respect to the support part 16 mentioned later inside the housing 11. As shown in FIG. Moreover, the 2nd screw 23 has a cylindrical part in which the 1st screw 22 is installed inside, and is comprised. The second screw 23 is rotatably supported with respect to the support portion 16 on the outer peripheral side of the cylindrical portion. A spiral thread groove is provided on the inner periphery of the cylindrical portion of the second screw 23. In the second screw 23, the inner region of the cylindrical portion is configured as a through hole extending in the axial direction of the second screw 23.

  The second screw 23 is provided with a gear portion 23a at one end portion of the portion extending in a cylindrical shape. An external gear is formed on the outer periphery of the gear portion 23a. The second screw 23 is installed so as to mesh with the spur gear 14b of the gear mechanism 14 in the external gear of the gear portion 23a. The rotational driving force from the spur gear 14b is input to the gear portion 23a. Thereby, the 2nd screw 23 is rotationally driven. The external gear of the gear portion 23a is provided as a gear having a larger diameter than the spur gear 14b. For this reason, the rotational driving force from the spur gear 14 b is decelerated and transmitted to the second screw 23.

  The second screw 23 is attached to the first screw 22 disposed inside the cylindrical portion of the second screw 23 so as to be relatively rotatable about the axis of the first screw 22. The second screw 23 is provided so as to be relatively displaceable in the axial direction with respect to the first screw 22 by rotating relative to the first screw 22. That is, the first screw 22 is also provided so as to be relatively displaceable in the axial direction with respect to the second screw 23 by rotating relative to the second screw 23.

  In addition, a plurality of balls 24 circulate and roll between the inner peripheral thread groove of the second screw 23 and the outer peripheral thread groove of the first screw 22. That is, the screw mechanism 15 has a configuration of a ball screw mechanism.

  The position of the axial center of the first screw 22 is coincident with the position of the axial center of the second screw 23. Then, the second screw 23 driven by the spur gear 14b rotates about the axis, so that the plurality of balls 24 roll between the thread groove of the first screw 22 and the thread groove of the second screw 23. To do. As a result, the first screw 22 is displaced in the axial direction of the first screw 22.

  When the second screw 23 rotates, the first screw 22 is displaced in the axial direction of the first screw 22 with respect to the housing 11 and the second screw 23. When the first screw 22 is displaced in the axial direction with respect to the housing 11, the output unit 12 is also displaced with respect to the housing 11 together with the first screw 22. On the other hand, the second screw 23 that is relatively displaced in the axial direction with respect to the first screw 22 is not displaced with respect to the housing 11 in the axial direction of the second screw 23.

  As described above, the second screw 23 is configured to be relatively displaceable in the axial direction with respect to the first screw 23 by rotating relative to the first screw 22. In the present embodiment, the second screw 23 to which the driving force from the electric motor 13 is input rotates, and the first screw 22 is axial with respect to the housing 11, the support portion 16, and the second screw 23. However, the configuration of the opposite relationship may be implemented. That is, a mode in which the first screw to which the driving force from the electric motor is input rotates and the second screw is displaced in the axial direction with respect to the housing, the support portion, and the first screw may be implemented. In this case, the driving force from the electric motor is input to the first screw as described above, and the second screw is connected to the output unit.

  An anti-rotation mechanism (not shown) is installed between the output unit 12 fixed to the first screw 22 and the housing 11. This anti-rotation mechanism is provided as a mechanism for restricting the displacement in the rotational direction of the first screw 22 and the output unit 12 around the axis of the first screw 22. This anti-rotation mechanism is provided, for example, as a mechanism in which a plurality of link members are connected, and one end is attached to the output unit 12 and the other end is attached to the housing 11. By providing the anti-rotation mechanism in this way, when the second screw 23 rotates, the first screw 22 moves along the linear direction.

[Supporting part]
The support portion 16 is provided as a structure that rotatably supports one of the first screw 22 and the second screw 23. In the present embodiment, the support portion 16 is configured to rotatably support the second screw 23. The support portion 16 includes a cylindrical structure portion 16a, bearing portions (16b, 16c), a spacer 16d, a sliding member 16e, and the like.

  The cylindrical structure portion 16a is formed in a cylindrical shape, and is provided as, for example, a cylindrical portion. A second screw 23 is disposed inside the cylindrical structure portion 16a. The 2nd screw 23 is rotatably installed via the bearing part (16b, 16c) with respect to the inner side of the cylindrical structure part 16a.

  Further, the cylindrical structure portion 16 a is disposed inside the housing 11. A plurality of sliding members 16e are attached to the outer periphery of the cylindrical structure portion 16a. The cylindrical structure portion 16a is slidably disposed along the direction parallel to the axial direction of the first screw 22 with respect to the inner periphery of the housing 11 via a plurality of sliding members 16e.

  The bearing portions (16b, 16c) are provided as a mechanism for rotatably supporting the outer periphery of the second screw 23 with respect to the inner periphery of the cylindrical structure portion 16a. In the present embodiment, the bearing portions (16b, 16c) are provided as a pair.

  The outer ring of the bearing portion 16b is fitted into the inner circumference on one end side of the cylindrical structure portion 16a. And the bearing part 16b is supporting the outer periphery of the 2nd screw 23 rotatably with respect to the one end side of the cylindrical structure part 16a. The outer ring of the bearing portion 16c is fitted into the inner periphery on the other end side of the cylindrical structure portion 16a. And the bearing part 16c is supporting the outer periphery of the 2nd screw 23 rotatably with respect to the other end side of the cylindrical structure part 16a. In this embodiment, the bearing part (16b, 16c) provided as a ball bearing is illustrated.

  The spacer 16d is provided as a cylindrical member, and is disposed between the bearing portion 16b and the bearing portion 16c. The spacer 16 d is attached to the outer periphery of the cylindrical portion of the second screw 23. The end portion on one end side of the spacer 16d is in contact with the inner ring of the bearing portion 16b. On the other hand, the other end of the spacer 16d is in contact with the inner ring of the bearing portion 16c. Thereby, the distance between the bearing part 16b and the bearing part 16c is prescribed | regulated to the predetermined distance in the inner ring | wheel side of a bearing part (16b, 16c).

  Note that the end of the bearing portion 16b opposite to the spacer 16d is in contact with a portion of the second screw 23 formed in a step shape and is positioned with respect to the second screw 23. Further, the end of the bearing portion 16 c opposite to the spacer 16 d side is positioned with respect to the second screw 23 by a stopper ring 26 fitted on the outer periphery of the second screw 23.

  With the above configuration, the positions of the bearing portions (16b, 16c) in the axial direction of the second screw 23 are fixed. Further, on the inner peripheral side of the cylindrical structure portion 16a, a stepped portion is provided between the outer ring of the bearing portion 16b and the outer ring of the bearing portion 16c. For this reason, the bearing parts (16b, 16c) fixed to the second screw 23 are also fixed to the cylindrical structure part 16a.

[Linking mechanism]
FIG. 5 is a schematic diagram showing the link mechanism 17 and the release mechanism 18. In FIG. 5, the outer shape of the link mechanism 17 and a part of the release mechanism 18 is illustrated. Further, in FIG. 5, a schematic cross section is shown for a portion provided integrally with the housing 11 in the release mechanism 18.

  The link mechanism 17 shown in FIGS. 3 to 5 includes a plurality of link members (17a, 17b). In this embodiment, the link mechanism 17 which has two link members (17a, 17b) connected in series is illustrated. Each link member (17a, 17b) is provided as a plate-like member having a longitudinal direction and extending linearly, for example. One end of the link member 17a and the link member 17b is connected to each other so as to be rotatable.

  As described above, the link mechanism 17 is configured by connecting the link member 17a and the link member 17b in series. One end of the link mechanism 17 is rotatably connected to the support 16. Furthermore, the other end of the link mechanism 17 is rotatably connected to the housing 11. That is, the end of the link mechanism 17 opposite to the end connected to the support 16 is connected to the housing 11 so as to be rotatable. Thus, the link mechanism 17 is provided so as to connect the support portion 16 and the housing 11.

  More specifically, one end of the link mechanism 17 is configured as an end of the link member 17a opposite to the end connected to the link member 17b. And the edge part on the opposite side to the link member 17b side in the link member 17a is connected with the protrusion part 16f in the support part 16 so that rotation is possible via a rotating shaft.

  Said protrusion part 16f is provided as a part which protruded toward the outer side from the outer periphery of the cylindrical structure part 16a in the support part 16. As shown in FIG. The projecting portion 16 f is disposed so as to penetrate the slit hole 11 b provided in the outer peripheral wall portion of the housing 11. Further, the protruding portion 16 f penetrating the slit hole 11 b is disposed so as to protrude from the inside of the housing 11 toward the outside. The end portion of the link member 17a is rotatably connected to the tip end portion of the protruding portion 16f exposed to the outside of the housing 11 from the slit hole 11b.

  In addition, the slit hole 11 b is provided as a slit-like hole penetrating in the outer peripheral wall portion of the housing 11. The slit hole 11 b opens along the direction parallel to the axial direction of the first screw 22 and the second screw 23 (hereinafter also referred to as “the axial direction of the screw mechanism 15”) in the outer peripheral wall portion of the housing 11. As is provided.

  The other end of the link mechanism 17 is configured as an end of the link member 17b opposite to the end connected to the link member 17a. An end of the link member 17b opposite to the link member 17a side is rotatably connected to the link connecting portion 11c of the housing 11 via a rotation shaft.

  Said link connection part 11c is provided as a part which protruded toward the outer side from the outer periphery of the housing 11. As shown in FIG. And the edge part of the link member 17b is rotatably connected with respect to the link connection part 11c. Further, the link connecting portion 11 c and the slit hole 11 b are arranged along the direction parallel to the axial direction of the screw mechanism 15 in the outer peripheral wall portion of the housing 11.

  3 and 5 show a state in which a plurality of linked link members (17a, 17b) extend linearly. The link mechanism 17 is configured to be able to regulate the relative displacement of the support portion 16 with respect to the housing 11 in a state where a plurality of linked link members (17a, 17b) extend linearly.

  The plurality of link members (17 a, 17 b) extending in a straight line extend along a direction parallel to the axial direction of the screw mechanism 15. And the support part 16 which supports the 2nd screw 23 is also installed so that relative movement with respect to the housing 11 along the direction parallel to the axial direction of the screw mechanism 15 is carried out. Further, the link members (17 a, 17 b) extending linearly connect the housing 11 and the support portion 16.

  As described above, in a state where the linked link members (17a, 17b) extend linearly, the movement of the support portion 16 with respect to the housing 11 in the direction parallel to the axial direction of the screw mechanism 15 is restricted. That is, the relative displacement of the support portion 16 with respect to the housing 11 in the direction parallel to the buckling direction of the link members (17a, 17b) extending linearly is restricted. In addition, since the link members (17a, 17b) are connected, the support portion 16 relative to the housing 11 in a direction parallel to the direction opposite to the buckling direction of the linearly extending link members (17a, 17b). Displacement is also restricted.

  Note that the state in which the linked link members (17a, 17b) extend linearly does not necessarily have to be the state in which the linked link members (17a, 17b) extend strictly along a straight line. The state in which the linked link members (17a, 17b) extend linearly includes a state in which the link mechanism 17 is slightly bent toward the housing 11 at the connection position of the linked link members (17a, 17b). It is. That is, the link mechanism 17 regulates the relative displacement of the support portion 16 with respect to the housing 11 even in a linear state such as being slightly bent toward the housing 11 at the connection position of the link members (17a, 17b). In this case, the connecting portion 17c, which is a portion where the plurality of link members (17a, 17b) in the link mechanism 17 are connected, comes into contact with the housing 11 side. For this reason, a deformation | transformation of the linked link member (17a, 17b) is controlled. Thereby, the relative displacement of the support portion 16 with respect to the housing 11 in the direction parallel to the buckling direction of the linearly extending link members (17a, 17b) is restricted. In addition, since the link members (17a, 17b) are connected, the support portion 16 relative to the housing 11 in a direction parallel to the direction opposite to the buckling direction of the linearly extending link members (17a, 17b). Displacement is also restricted.

  On the other hand, the link mechanism 17 is bent at the connection position of the plurality of linked link members (17a, 17b) when a release mechanism 18 described later operates. At this time, the connecting portion 17 c in the link mechanism 17 is displaced in a direction away from the housing 11. Thereby, the relative displacement with respect to the housing 11 of the support part 16 is accept | permitted. That is, the link mechanism 17 is bent at the connection position of the linked link members (17a, 17b) when the release mechanism 18 is operated, and is configured to allow relative displacement of the support portion 16 with respect to the housing 11. Has been.

[Release mechanism]
The release mechanism 18 is provided as a mechanism that can release the restriction of the relative displacement of the support portion 16 with respect to the housing 11 by the link mechanism 17. The release mechanism 18 operates based on a command from the aforementioned moving blade control controller. The controller for moving blade control activates the release mechanism 18 when it is detected that a fixed state (jam state) has occurred in the screw mechanism 15. Note that the fixed state in the screw mechanism 15 occurs due to a cause such as twisting or seizing between the first screw 22, the second screw 23, and the ball 24.

  Moreover, the method of detecting that the fixing state has occurred in the screw mechanism 15 can be implemented by various means. For example, the moving blade control controller receives a signal from a current sensor that detects the torque current of the electric motor 13, and the moving blade control controller uses the screw mechanism 15 based on the current value detected by the current sensor. The occurrence of the fixed state may be detected. In this case, for example, the moving blade control controller is configured to determine that the fixed state is generated in the screw mechanism 15 when the current value detected by the current sensor is larger than a predetermined value. Also good.

  Alternatively, on the basis of a signal from the position detection mechanism 21 described later, the occurrence of the fixed state in the screw mechanism 15 may be detected by the moving blade control controller. As will be described later, the position detection mechanism 21 detects the position of the first screw 22 relative to the housing 11. For example, the moving blade control controller outputs a command for displacing the output unit 12 with respect to the housing 11, but the first screw 22 is displaced by a predetermined displacement amount or less with respect to the housing 11. In this case, the screw mechanism 15 may be configured to determine that a fixed state has occurred.

  As shown in FIG. 18, the release mechanism 18 includes a plunger 27, a solenoid 28, a guide portion 29, and the like. The plunger 27 and the solenoid 28 are installed in the housing 11. The guide portion 29 is configured as a part of the housing 11 or a member fixed to the housing 11.

  The plunger 27 is provided with a plunger tip portion 27a and a plunger main body portion 27b. The plunger tip portion 27a is provided as a portion protruding from the plunger main body portion 27b. And the plunger front-end | tip part 27a is provided as a part which can contact | abut with respect to the connection part 17c which is a part to which the some link member (17a, 17b) in the link mechanism 17 is connected. The plunger tip 27 a is disposed inside a guide hole 29 a formed through the guide 29. The plunger tip 27a is guided in the displacement direction by the guide hole 29a.

  The plunger main body portion 27 b is disposed inside the solenoid 28. The plunger main body 27 b is driven by a solenoid 28. The plunger body 27 b is provided as a movable iron core that is displaced relative to the solenoid 28 by being driven by the solenoid 28.

  With the above configuration, the plunger 27 is driven by the solenoid 28 so as to protrude outward from the housing 11. The plunger 27 is supported by the release mechanism 18 so as to be displaceable so as to protrude from the housing 11 toward the connecting portion 17c. The plunger 27 is configured as a protrusion in the present embodiment.

  The solenoid 28 is provided as a coil portion that is energized based on a command from the aforementioned moving blade control controller. When the solenoid 28 is energized and excited, the release mechanism 18 operates. The solenoid 28 is excited to drive the plunger 27 so as to protrude toward the connecting portion 17 c of the link mechanism 17. The plunger 27 is driven by the solenoid 28 and protrudes toward the connecting portion 17c, thereby further biasing the connecting portion 17c in a state where the plunger 27 is in contact with the connecting portion 17c. Thereby, the plunger 27 urges | biases the connection part 17c so that the link mechanism 17 may be bent. The solenoid 28 is configured as a protruding drive unit in the present embodiment.

  FIG. 6 is a schematic diagram illustrating a state where the release mechanism 18 is activated, and is a diagram corresponding to FIG. 5. As shown in FIG. 6, the plunger 27 is driven by the solenoid 28 to project toward the connecting portion 17 c. The link mechanism 17 is bent by the plunger 27 urging the connecting portion 17c.

  The link mechanism 17 with the link members (17a, 17b) extending linearly supports a large force in the direction in which the link members (17a, 17b) extend linearly. On the other hand, the force that can be supported by the link mechanism 17 in the direction orthogonal to the direction in which the link members (17a, 17b) extend linearly is small. The plunger 27 abuts against the connecting portion 17c from a direction substantially orthogonal to the direction in which the link members (17a, 17b) extend linearly. For this reason, when the plunger 27 biases the connecting portion 17c, the link mechanism 17 is easily bent.

  Further, as shown in FIG. 6, when the release mechanism 18 is operated and the link mechanism 17 is bent at the connection position, the link mechanism 17 is further easily bent. That is, in the state shown in FIG. 6, the link mechanism 17 is easily bent further by an external force acting from the support portion 16.

  In the present embodiment, the plunger 27 is configured to protrude from the solenoid 28 toward the connecting portion 17c when the solenoid 28 is excited. The release mechanism 18 is also provided with a separation spring (not shown) that urges the plunger 27 in the direction of separating the plunger 27 from the connection portion 17c.

  In the state where the solenoid 28 is demagnetized, the spring force of the above-described separating spring is acting, so that the operation of the plunger 27 urging the connecting portion 17c to bend the link mechanism 17 at the connecting position is as follows. Not done. On the other hand, when the solenoid 28 is excited, the plunger 27 protrudes toward the connecting portion 17c against the spring force of the separating spring. Then, the plunger 27 biases the connecting portion 17 c so as to bend the link mechanism 17.

  In the present embodiment, the configuration in which the plunger 27 urges the connecting portion 17c when the solenoid 28 is excited is illustrated, but this need not be the case. A modification in which the plunger 27 protrudes from the solenoid 28 toward the connecting portion 17c by demagnetizing the solenoid 28 may be implemented.

  In the case of the above-described modification, the release mechanism 18 is provided with a protruding spring (not shown) that biases the plunger 27 in a direction in which the plunger 27 protrudes toward the connecting portion 17c. When the solenoid 28 is energized, the plunger 27 is displaced in a direction away from the connecting portion 17c against the spring force of the protruding spring. For this reason, the operation | movement which the plunger 27 urges | biases the connection part 17c so that the link mechanism 17 may be bent is not performed. On the other hand, when the solenoid 28 is demagnetized, the plunger 27 projects toward the connecting portion 17c by the spring force of the projecting spring. Then, the plunger 27 biases the connecting portion 17 c so as to bend the link mechanism 17.

  As described above, the guide portion 29 is provided as a part of the housing 11 or as a member fixed to the housing 11. And the guide part 29 is provided with the guide hole 29a which guides the displacement direction of the plunger front-end | tip part 27a. The guide hole 29 a is provided as a through hole in the guide portion 29. The guide hole 29 a opens toward the connecting portion 17 c of the link mechanism 17. Furthermore, the guide hole 29a is provided in the guide part 29 as a hole extending along a direction orthogonal to the link members (17a, 17b) in a linearly extending state.

[Torsion spring, one-way clutch, position detection mechanism]
The torsion spring 19 shown in FIG. 3 is provided as a coil spring and constitutes a spring member in this embodiment. The torsion spring 19 is installed with respect to the link mechanism 17 and the housing 11 in this embodiment. More specifically, the torsion spring 19 is installed at a position where the link member 17b and the link connecting portion 11c of the housing 11 are connected.

  In FIG. 3, the relationship between the torsion spring 19 and the one-way clutch 20 and their mounting positions in the electric actuator 1 is schematically shown in an exploded perspective view. Specifically, in FIG. 3, the correspondence relationship between the torsion spring 19 and the one-way clutch 20 and their mounting positions in the electric actuator 1 is shown by a one-dot chain line.

  One end of the coil of the torsion spring 19 wound in a coil shape is attached and fixed to the end of the link member 17b. On the other hand, the other end of the coil wound in the coil shape of the torsion spring 19 is attached and fixed to the link connecting portion 11c.

  With the structure described above, the torsion spring 19 applies torque to the link member 17b so as to press the connecting portion 17c of the link mechanism 17 extending linearly toward the guide portion 29 on the housing 11 side. That is, the torsion spring 19 imparts torque to the link member 17b so as to press the connecting portion 17c toward the housing 11 in a state where the relative displacement of the support portion 16 with respect to the housing 11 is restricted by the link mechanism 17.

  Further, due to the structure described above, the torsion spring 19 allows the release mechanism 18 to release the restriction of the relative displacement of the support portion 16 with respect to the housing 11 by the link mechanism 17, and the link mechanism 17 is in a bent state. Torque is applied to the member 17b. At this time, the torsion spring 19 applies a torque in a direction for urging the connecting portion 17c toward the housing side to the link member 17b. That is, after the releasing operation by the releasing mechanism 18, the torsion spring 19 applies a torque in a direction in which the link member 17a and the link member 17b are urged to increase the bending angle formed on the housing 11 side to the link member 17b. To do.

  Further, after the releasing operation by the releasing mechanism 18, the torsion spring 19 applies a torque having a magnitude corresponding to the bending state of the link mechanism 17 to the link member 17 a. That is, after the releasing operation by the releasing mechanism 18, the torsion spring 19 applies to the link member 17 a torque having a magnitude corresponding to the amount of displacement in which the connecting portion 17 c is displaced away from the housing 11.

  The one-way clutch 20 is provided as a clutch mechanism that transmits rotational force only in one direction. The one-way clutch 20 is installed with respect to the link mechanism 17 and the housing 11 in this embodiment. More specifically, the one-way clutch 20 is installed at a position where the link member 17b and the link connecting portion 11c of the housing 11 are connected. As the one-way clutch 20, various types of one-way clutches such as a cam type and a sprag type can be used. The one-way clutch 20 is attached, for example, by engaging the inner ring side with the link member 17b and engaging the outer ring side with the link connecting portion 11c.

  The one-way clutch 20 is installed so as to restrict only the rotation operation of the link member 17b in the direction in which the bending angle formed by the link member 17a and the link member 17b on the housing 11 side increases. That is, the one-way clutch 20 is installed so as to restrict only the rotation operation of the link member 17b in the direction in which the link members (17a, 17b) tend to extend linearly. Thus, the one-way clutch 20 restricts the rotation of the link member 17b so that the connecting portion 17c of the link mechanism 17 approaches the housing 11 after the release operation by the release mechanism 18. The one-way clutch 20 is provided so as not to restrict the rotation of the link member 17b so that the connecting portion 17c is separated from the housing 11.

  As described above, in the state after the release operation by the release mechanism 18, the one-way clutch 20 is allowed to perform a deformation operation in which the link mechanism 17 is deformed in a larger bending direction. That is, the one-way clutch 20 is allowed to perform a deformation operation in which the link mechanism 17 is deformed in a bending direction so that the connecting portion 17 c is separated from the housing 11. On the other hand, the one-way clutch 20 does not allow a deformation operation in which the link mechanism 17 is deformed in the extending direction.

  Further, after the releasing operation by the releasing mechanism 18, the torsion spring 19 applies a torque having a magnitude corresponding to the amount of displacement of the connecting portion 17 c away from the housing 11 to the link member 17 b. Thereby, after the releasing operation by the releasing mechanism 18, the link mechanism 17 is prevented from being bent suddenly. The one-way clutch 20 restricts the displacement of the connecting portion 17c approaching the housing 11. Thereby, after the releasing operation by the releasing mechanism 18, the one-way clutch 20 prevents the linked link members (17a, 17b) from returning to the linearly extended state.

  The position detection mechanism 21 shown in FIGS. 3 and 4 includes a case 21a and a probe 21b that is displaced with respect to the case 21a. The position detection mechanism 21 is provided as a mechanism for detecting the relative position of the probe 21b with respect to the case 21a. In the position detection mechanism 21, the main part of the case 21 a and the probe 21 b are disposed inside the first screw 22.

  The case 21a is installed in the housing 11, and a primary side coil and a secondary side coil (not shown) are provided therein. The probe 21 b is attached to the first screw 22 so as to be displaced together with the first screw 22. The probe 21b is provided with a movable iron core that is displaced relative to the case 21a inside the coil of the case 21a. With the above configuration, the position detection mechanism 21 is configured to detect the position of the first screw 22 with respect to the housing 11. The output unit 12 is fixed to the first screw 22. For this reason, the position of the output unit 12 relative to the housing 11 is also detected by the position detection mechanism 21.

  In the position detection mechanism 21, the movable iron core is displaced with respect to the case 21a in a state where the primary coil is excited, so that a signal based on the induced voltage generated in the secondary coil is a position detection signal. Is output as The output position detection signal is transmitted to the moving blade control controller. The controller for moving blade control that has received the position detection signal controls the electric motor 13 and controls the operation of the moving blade 102 based on the position detection signal.

[Electric actuator operation]
The operation of the electric actuator 1 will be described. In a normal state where the screw mechanism 15 is not fixed, the electric actuator 1 is operated by the operation of the electric motor 13 based on a command from the moving blade control controller.

  In the above case, the electric actuator 1 is in a state where the release mechanism 18 is not operating. For this reason, as shown in FIG. 3, the link mechanism 17 is a state in which the link members (17a, 17b) extend linearly. Thereby, the relative displacement with respect to the housing 11 of the support part 16 in the direction parallel to the axial direction of the screw mechanism 15 is regulated. And since the 2nd screw 23 is hold | maintained at the support part 16, the relative displacement with respect to the housing 11 of the 2nd screw 23 in the direction parallel to the axial direction of the screw mechanism 15 is also controlled.

  In the above state, when the electric motor 13 is operated, the rotational driving force of the electric motor 13 is transmitted to the second screw 23 via the gear mechanism 14. As a result, the second screw 23 held by the support portion 16 rotates around the axis of the first screw 22. As the second screw 23 rotates, the first screw 22 is displaced in the axial direction of the first screw 22 with respect to the housing 11 and the second screw 23 together with the output unit 12 as described above. Thereby, the moving blade 102 is driven with respect to the blade 101.

  FIG. 7 is a diagram for explaining the operation of the electric actuator 1. In FIG. 3, a state in which the first screw 22 and the output unit 12 are retracted to a position where the first screw 22 and the output unit 12 are most contracted with respect to the housing 11 is illustrated. On the other hand, in FIG. 7, the state which the 1st screw 22 and the output part 12 protruded from the housing 11 rather than the position shown in FIG. 3 is illustrated.

  When the state of the electric actuator 1 is the state shown in FIG. 3, the moving blade 102 is not standing with respect to the blade 101 as shown in FIG. 1. That is, the surface of the moving blade 102 is disposed along the surface on which the surface of the blade 101 is disposed. The rear end portion of the moving blade 102 is located in the vicinity of the surface of the moving blade 103. The rear end portion of the moving blade 102 is an end portion on the opposite side to the end portion of the moving blade 102 on the side connected to the electric actuator 1. The position of the moving blade 102 shown in FIG. 1 is a position for not reducing the lift of the aircraft.

  The position of the moving blade 102 shown in FIG. 2 is a position for reducing the lift of the aircraft. For example, when the aircraft is landing, the moving blade 102 is driven to swing to the position shown in FIG. 2 in order to decrease the lift of the aircraft and increase the vertical drag required for the frictional force with the ground. Alternatively, the moving blade 102 is driven to swing to the position shown in FIG. 2 in order to reduce the altitude without increasing the speed as the aircraft descends from the cruise altitude. In this case, the electric motor 13 is operated based on a command from the moving blade control controller, and the first screw 22 and the output unit 12 are driven to protrude from the housing 11 as shown in FIG. The As a result, the moving blade 102 swings, and the moving blade 102 stands up with respect to the blade 101 as shown in FIG.

  On the other hand, when it becomes unnecessary to reduce the lift of the aircraft, the electric motor 13 is operated based on a command from the moving blade control controller, and the first screw 22 and the output unit 12 are connected to the housing 11. It is driven so as to retract to the most contracted position. As a result, the moving blade 102 swings, and the moving blade 102 does not stand up with respect to the blade 101 as shown in FIG.

  Next, the operation of the electric actuator 1 when a fixed state occurs in the screw mechanism 15 will be described. For example, when the fixing state of the screw mechanism 15 occurs during the operation in which the first screw 22 protrudes or contracts with respect to the housing 11, the first screw 22 is displaced in the axial direction with respect to the second screw 23. It becomes impossible. In this case, the moving blade control controller detects the occurrence of the fixed state of the screw mechanism 15 as described above.

  As described above, in the middle of the operation in which the first screw 22 protrudes or contracts with respect to the housing 11, when a fixed state occurs in the screw mechanism 15, the moving blade 102 is It stands up to some extent. Since the axial displacement of the first screw 22 with respect to the second screw 23 is impossible, the first screw 22 and the output unit 12 are most contracted with respect to the housing 11 depending on the normal operation of the electric actuator 1. It cannot be retracted to the position.

  However, as described above, when the occurrence of the fixed state of the screw mechanism 15 is detected, the release mechanism 18 operates based on a command from the moving blade control controller. That is, the solenoid 28 is excited and the plunger 27 protrudes toward the connecting portion 17 c of the link mechanism 17. Thereby, as shown in FIG. 6, the link mechanism 17 bends in a connection position. Note that when the occurrence of the fixed state of the screw mechanism 15 is detected, the operation of the electric motor 13 is also stopped.

  When an external force is applied to the moving blade 102 in a state where the release mechanism 18 is activated and the link mechanism 17 is bent, the external force is applied to the output unit 12. The external force acting on the output unit 12 is transmitted to the first screw 22. Since the first screw 22 is fixed to the second screw 23, the external force transmitted to the first screw 22 is linked to the link mechanism 17 via the first screw 22, the second screw 23, and the support portion 16. Is transmitted to.

  In the above state, the one-way clutch 20 regulates the operation of the link member 17b rotating so that the connecting portion 17c of the link mechanism 17 approaches the housing 11. For this reason, when an external force that urges the output portion 12 in the direction in which the output portion 12 protrudes from the housing 11 acts on the output portion 12, the output portion 12 in the axial direction of the screw mechanism 15 is controlled by the operation restriction by the one-way clutch 20. The position with respect to the housing 11 hardly changes. That is, the positions of the output portion 12, the screw mechanism 15, and the support portion 16 with respect to the housing 11 in the axial direction of the screw mechanism 15 hardly change. Further, the bending angle of the link mechanism 17 hardly changes.

  On the other hand, the one-way clutch 20 allows the link member 17b to rotate so that the connecting portion 17c is separated from the housing 11. For this reason, when an external force that urges the output unit 12 in the direction of contracting with respect to the housing 11 acts on the output unit 12, the output unit 12 moves in a direction of contracting with respect to the housing 11. And the screw mechanism 15 and the support part 16 with the output part 12 also move toward the connection part 11a side in the housing 11. At this time, since the first screw 22 and the second screw 23 are fixed, the first screw 22, the second screw 23, and the support portion 16 are integrated with each other in the housing 11. Move in the axial direction.

  When the output unit 12, the screw mechanism 15, and the support unit 16 move with respect to the housing 11 as described above, the link mechanism 17 bends so that the connecting portion 17 c is separated from the housing 11. That is, the link mechanism 17 bends more greatly. Further, when the link mechanism 17 is bent in this way, the torsion spring 19 applies a torque having a magnitude corresponding to the amount of displacement of the connecting portion 17c away from the housing 11 to the link member 17a. For this reason, it is suppressed that the output part 12, the screw mechanism 15, and the support part 16 move toward the connection part 11a side of the housing 11 rapidly.

  FIG. 8 is a diagram for explaining the operation of the electric actuator 1 and shows a state in which the link mechanism 17 is bent. In FIG. 8, a state in which the output unit 12 is retracted to a position where it is most contracted with respect to the housing 11 is illustrated.

  When the moving blade 102 stands up with respect to the wing 101 even while the aircraft is flying or landing, the moving blade 102 is caused to approach the moving blade 103 at the rear end portion of the moving blade 102. External force in the direction acts. For this reason, in the above state, an external force that urges the output portion 12 in a direction to contract the housing 11 acts on the output portion 12. Thereby, in the above state, as shown in FIG. 8, until the output unit 12 is retracted to the most contracted position with respect to the housing 11, the output unit 12, the screw mechanism 15, and the support unit 16 are It moves toward the connecting portion 11a side of the housing 11. Then, the moving blade 102 is not standing with respect to the blade 101.

[effect]
As described above, according to the present embodiment, relative displacement of the support portion 16 with respect to the housing 11 is restricted by the link mechanism 17 that extends linearly when the release mechanism 18 is not in operation. Then, the driving force from the electric motor 13 is input to the screw mechanism 15 having the first and second screws (22, 23). In the screw mechanism 15, the rotational driving force output from the electric motor 13 is converted into a linear driving force. The driving force converted by the screw mechanism 15 is output from the output unit 12. Thus, the electric actuator 1 displaces the output unit 12 so as to expand and contract along the linear direction with respect to the housing 11, and drives the moving blade 102.

  On the other hand, when a fixed state occurs in the screw mechanism 15, that is, when a fixed state occurs between the first screw 22 and the second screw 23, the release mechanism 18 is operated. When the release mechanism 18 operates, the link mechanism 17 is bent. And the relative displacement with respect to the housing 11 of the support part 16 which supports the screw mechanism 15 is accept | permitted. Thereby, the screw mechanism 15 can be displaced with respect to the housing 11 together with the support portion 16 in a direction in which the distance between one end portion and the other end portion of the link mechanism 17 becomes smaller. For this reason, when an external force is applied to the output unit 12, the output unit 12 can be displaced together with the support unit 16 and the fixed screw mechanism 15 in a contracting direction with respect to the housing 11. Therefore, according to the electric actuator 1, the output unit 12 can be retracted to the contracted position with respect to the housing 11 even when the screw mechanism 15 is stuck. Furthermore, the structure for retracting the output unit 12 as described above is realized by a small and simple structure including the support unit 16, the link mechanism 17, and the release mechanism 18. For this reason, simplification and size reduction of the structure of the electric actuator 1 are achieved.

  Therefore, according to the present embodiment, the output unit 12 can be retracted to the contracted position with respect to the housing 11 even when the screw mechanism 15 is fixed, and the structure can be simplified. The electric actuator 1 that can be reduced in size can be provided.

  Further, according to the present embodiment, the plunger (projection part) 27 driven by the solenoid (projection drive part) 28 projects toward the connection part 17c of the link mechanism 17 and biases the connection part 17c. Thereby, the link mechanism 17 bends. Therefore, the release mechanism 18 is realized by a small and simple structure that includes the plunger (projection part) 27 and the solenoid (projection drive part) 28.

  Moreover, according to this embodiment, the support part 16 is implement | achieved by the small and simple structure comprised including the cylindrical structure part 16a and the bearing parts (16b, 16c). Moreover, according to this embodiment, the outer periphery of the 2nd screw 23 is supported via a bearing part (16b, 16c) with respect to the inner periphery of the cylindrical structure part 16a. For this reason, the 2nd screw 23 can be supported stably.

  Further, according to the present embodiment, torque is applied to the link member 17b by the torsion spring (spring member) 19 so that the connecting portion 17c of the link mechanism 17 is pressed toward the housing 11 side. For this reason, the state where the relative displacement of the support portion 16 with respect to the housing 11 is regulated by the link mechanism 17 can be easily maintained by a simple structure provided with the torsion spring (spring member) 19.

  Further, according to the present embodiment, the spring member that applies torque to the link member 17b is realized by a simple torsion spring 19 configured as a coil spring. Further, after the releasing operation by the releasing mechanism 18, the torsion spring 19 applies a torque having a magnitude corresponding to the amount of displacement of the connecting portion 17c from the housing 11 to the link member 17b. For this reason, when external force acts on the output part 12, it can suppress that the output part 12 contracts with respect to the housing 11 rapidly. Thereby, it can suppress that the screw mechanism 15 moves suddenly within the housing 11, and a mechanical impact force generate | occur | produces.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 9 is a schematic diagram showing the link mechanism 17 and the release mechanism 30 of the electric actuator according to the second embodiment of the present invention. The electric actuator according to the second embodiment is configured similarly to the electric actuator 1 of the first embodiment. However, the electric actuator according to the second embodiment is different from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 30.

  Hereinafter, regarding the electric actuator according to the second embodiment, a configuration different from that of the first embodiment will be described. And in 2nd Embodiment, about the element comprised like 1st Embodiment, the code | symbol same as 1st Embodiment is quoted by attaching | subjecting the code | symbol same as 1st Embodiment in drawing. Therefore, explanation is omitted.

  Similar to the first embodiment, the electric actuator according to the second embodiment is applied to the moving blade drive mechanism 100 and is configured as an actuator that drives the moving blade 102. The electric actuator according to the second embodiment includes a housing 11, an output unit 12, an electric motor 13, a gear mechanism 14, a screw mechanism 15, a support unit 16, a link mechanism 17, a release mechanism 30, a torsion spring 19, and a one-way clutch 20. The position detecting mechanism 21 is provided.

  The release mechanism 30 is provided as a mechanism that can release the restriction on the relative displacement of the support portion 16 with respect to the housing 11 by the link mechanism 17. The release mechanism 30 is driven and operated by manual operation. When an operator (not shown) grasps that the fixed state has occurred in the screw mechanism 15, the release mechanism 30 is manually operated.

  As shown in FIG. 9, the release mechanism 30 includes a cam member 31 and a rotation drive unit 32. The release mechanism 30 is installed in the housing 11. In addition, in FIG. 9, the installation form with respect to the housing 11 of the cancellation | release mechanism 30 is typically shown in figure.

  The cam member 31 is attached to the rotation shaft 32 a of the rotation drive unit 32. And the cam member 31 is supported with respect to the rotating shaft 32a so that rotation with the rotating shaft 32a is possible. The cam member 31 includes a main body portion 31a and an eccentric portion 31b. The main body 31a and the eccentric part 31b are integrally provided.

  The main body 31a is provided as a columnar part, for example. The main body 31 a is fixed and supported by the rotation shaft 32 a of the rotation driving unit 32. And the main-body part 31a is supported with respect to the rotating shaft 32a so that it can rotate with the rotating shaft 32a centering | focusing on the central axis of a column-shaped part.

  The eccentric portion 31b is provided as a portion protruding from the main body portion 31a in the radial direction of the main body portion 31a. And the eccentric part 31b is provided in the part in the outer peripheral direction of the main-body part 31a as a part protruded from the main-body part 31a. Thereby, the eccentric part 31b is a part in the outer peripheral part of the cam member 31, and is formed so that the distance dimension from the rotation center position of the cam member 31 to the outer peripheral position is larger than the other part in the outer peripheral part. It is provided as a part. The rotation center position of the main body 31a is the rotation center position of the cam member 31. And the rotation center position of the cam member 31 is located on the rotation center axis line of the rotating shaft 32a.

  Moreover, the distance dimension from the rotation center position of the main-body part 31a in the outer periphery of the eccentric part 31b is comprised so that it may change gradually according to the change of the angular position with respect to the rotation center position of the main-body part 31a. Specifically, after the distance dimension gradually increases at a certain degree, the distance dimension increases from the middle while decreasing, and increases to a position where the distance dimension becomes the largest. And said distance dimension will reduce gradually, if the position where the distance dimension is the largest is exceeded. In addition, when the distance dimension exceeds the position having the largest distance dimension, the distance dimension decreases while increasing, and gradually decreases at a certain degree from the middle.

  The rotation drive unit 32 is provided as a mechanism for driving the cam member 31 to rotate. The rotation drive unit 32 includes a rotation shaft 32a, a rotation plate 32b, a handle 32c, and the like.

  The rotating shaft 32 a is supported so as to be rotatable with respect to the housing 11. And the cam member 31 is being fixed to the front-end | tip part of the rotating shaft 32a. As described above, the cam member 31 is rotatably supported with respect to the housing 11 by the rotation shaft 32a. Further, when viewed from a plane parallel to both the central axis of the rotating shaft 32a and the link mechanism 17 extending linearly, the direction in which the link mechanism 17 extending linearly extends from the central axis of the rotating shaft 32a. The position of the rotating shaft 32a is set so that it appears to overlap perpendicularly.

  The rotating plate 32b is fixed to the rotating shaft 32a at the end of the rotating shaft 32a opposite to the end where the cam member 31 is attached. The rotating plate 32b is provided as a plate-like member having a rectangular front and back surfaces, for example. The rotating plate 32b is fixed to the rotating shaft 32a so that the surface direction extending in a plate shape extends perpendicularly to the central axis of the rotating shaft 32a. The rotating plate 32b is fixed to the rotating shaft 32a on one end side in the longitudinal direction.

  The handle 32c is provided as a part for the operator to hold and operate when a manual operation is performed by the operator. The handle 32c is provided, for example, as an elongated columnar portion so that the operator can easily hold it. The handle 32c is fixed with respect to the rotating plate 32b. The handle 32c is fixed to the rotary plate 32b on the end side opposite to the end side attached to the rotary shaft 32a in the longitudinal direction of the rotary plate 32b.

  The handle 32c is attached to the rotating plate 32b so as to protrude from the side opposite to the rotating shaft 32a. That is, the handle 32c is attached to the rotating plate 32b so as to protrude from the surface opposite to the side from which the rotating shaft 32a protrudes on the front and back surfaces of the rotating plate 32b. Further, the handle 32c is attached to the rotating plate 32b so that the longitudinal direction of the cylindrical handle 32c is set in parallel with the central axis direction of the rotating shaft 32a. The handle 32c and the rotating plate 32b are installed in the housing 11 in a state where the handle 32c and the rotating plate 32b are exposed to the outside of the housing 11 so that the operator can rotate them around the rotating shaft 32a.

  When the operator operates the handle 32c and the handle 32c and the rotating plate 32b rotate about the rotating shaft 32a, the release mechanism 30 operates. And the cam member 31 is arrange | positioned in the vicinity of the connection part 17c of the link mechanism 17 of a linear state. Further, the cam member 31 is arranged at a position where the eccentric portion 31b abuts on the connecting portion 17c and can bias the connecting portion 17c by rotating together with the rotation shaft 32a around the rotation center position. . As a result, in the release mechanism 30, the eccentric portion 31 b biases the connecting portion 17 c so as to bend the link mechanism 17 by the rotation drive unit 32 being operated by the operator's operation and the cam member 31 rotating. It is configured as follows.

  The electric actuator of the second embodiment is different from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 30, but the other elements are similarly configured. For this reason, in the state where the release mechanism 30 is not operated and the state after the release mechanism 30 is operated, the electric actuator of the second embodiment operates in the same manner as the electric actuator 1 of the first embodiment.

  According to the second embodiment described above, similarly to the first embodiment, the output unit 12 can be retracted to the contracted position with respect to the housing 11 even when the screw mechanism 15 is fixed. It is possible to provide an electric actuator that can be simplified and downsized while being possible.

  Furthermore, according to the second embodiment, the cam member 31 driven by the rotation drive unit 32 rotates, and the eccentric portion 31b of the cam member 31 biases the connecting portion 17c of the link mechanism 17. Thereby, the link mechanism 17 bends. Therefore, the release mechanism 30 is realized by a small and simple structure including the cam member 31 and the rotation drive unit 32.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 10 is a schematic diagram showing the link mechanism 17 and the release mechanism 40 of the electric actuator according to the third embodiment of the present invention. The electric actuator according to the third embodiment is configured in the same manner as the electric actuator 1 of the first embodiment. However, the electric actuator according to the third embodiment is different from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 40.

  Hereinafter, regarding the electric actuator according to the third embodiment, a configuration different from that of the first embodiment will be described. And in 3rd Embodiment, about the element comprised similarly to 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected in a drawing, or the code | symbol same as 1st Embodiment is quoted. Therefore, explanation is omitted.

  As in the first embodiment, the electric actuator according to the third embodiment is applied to the moving blade driving mechanism 100 and is configured as an actuator that drives the moving blade 102. The electric actuator according to the third embodiment includes a housing 11, an output unit 12, an electric motor 13, a gear mechanism 14, a screw mechanism 15, a support unit 16, a link mechanism 17, a release mechanism 40, a torsion spring 19, and a one-way clutch 20. The position detecting mechanism 21 is provided.

  The release mechanism 40 is provided as a mechanism that can release the restriction on the relative displacement of the support portion 16 with respect to the housing 11 by the link mechanism 17. The release mechanism 40 operates by manual operation. When an operator (not shown) grasps that the fixed state has occurred in the screw mechanism 15, the release mechanism 40 is manually operated.

  As illustrated in FIG. 10, the release mechanism 40 includes a pin member 41 and an operation unit 42. The release mechanism 40 is installed in the link mechanism 17. In addition, in FIG. 10, the installation form with respect to the link mechanism 17 of the cancellation | release mechanism 40 is typically shown in figure.

  The pin member 41 is provided as a columnar member and is attached to the link mechanism 17. And the pin member 41 is provided as a member which connects the some link member (17a, 17b) while penetrating the through-hole 43 provided in each of the some link member (17a, 17b).

  The link member 17a is provided with a through hole 43 at the end opposite to the end connected to the protruding portion 16f. The link member 17b is provided with a through-hole 43 at the end opposite to the end connected to the link connecting portion 11c. Then, in a state where the through hole 43 of the link member 17a and the through hole 43 of the link member 17b are overlapped, the pin member 41 penetrates through the through holes 43 of both link members (17a, 17b). So that it is inserted. Thereby, the link member 17a and the link member 17b are connected by the pin member 41. In the link mechanism 17, the link member 17 a and the link member 17 b are connected by the pin member 41 in a state where the plurality of link members (17 a, 17 b) extend linearly.

  The operation unit 42 is provided as an element capable of operating the pin member 41 and is attached to the pin member 41. And the operation part 42 is provided as a part for an operator to hold and operate when manual operation is performed by the operator. In the present embodiment, the operation unit 42 is provided as a ring-shaped member. The operation portion 42 is attached to the pin member 41 in a state where the operation portion 42 is engaged with the pin member 41 in a part of the ring-shaped portion in the circumferential direction. The operation unit 42 is swingably attached to the pin member 41 so that the operator can easily perform the operation.

  In the present embodiment, the ring-shaped operation unit 42 provided as a separate member from the pin member 41 has been described as an example in which it is swingably attached to the pin member 41. Good. A mode in which the operation unit is fixed to the pin member 41 may be implemented. Further, a mode in which the operation unit is provided integrally with the pin member 41 may be implemented. Moreover, the form provided with the operation part of shapes other than a ring shape may be implemented.

  When the operator operates the operation unit 42, the release mechanism 40 is activated. Specifically, when operating the release mechanism 40, the operator performs a pulling operation of the operation unit 42 so as to pull out the pin member 41 installed in the link mechanism 17 from the link mechanism 17. And operation of the operation part 42 is performed so that the pin member 41 is extracted from the through-holes 43 of the plurality of link members (17a, 17b), whereby the connection of the plurality of link members (17a, 17b) is disconnected. It will be in the state.

  When the operation unit 42 is operated to disconnect the plurality of link members (17a, 17b), the link member 17a is in a direction parallel to the axial direction of the screw mechanism 15 with respect to the link member 17b. Along with this, relative displacement becomes possible. For this reason, relative displacement of the support portion 16 with respect to the housing 11 is allowed. In this way, the link mechanism 17 is in a state in which the connection of the plurality of link members (17a, 17b) is disconnected so as to allow relative displacement of the support portion 16 with respect to the housing 11 by operating the release mechanism 40. Become.

  In the electric actuator according to the third embodiment, the first one-way clutch 20 and the second one-way clutch 20 are provided, and two one-way clutches 20 are provided. The first one-way clutch 20 is installed at a position where the link member 17b and the link connecting portion 11c of the housing 11 are connected. And the 2nd one-way clutch 20 is installed in the position where the link member 17a and the protrusion part 16f of the support part 16 are connected.

  The first one-way clutch 20 restricts only the rotation operation of the link member 17b in the direction in which the end of the link member 17b opposite to the end connected to the link connecting portion 11c is separated from the housing 11. is set up. On the other hand, the second one-way clutch 20 restricts only the rotation operation of the link member 17a in the direction in which the end of the link member 17a opposite to the end connected to the protruding portion 16f is separated from the housing 11. Is installed.

  In a state after the connection of the plurality of link members (17 a, 17 b) is cut off, each link member (17 a, 17 b) is supported in a cantilever state with respect to the housing 11. However, by providing the first and second one-way clutches 20 as described above, the link members (17a, 17b) may freely rotate with respect to the housing 11 around the housing 11. Is prevented. Thereby, it is prevented that each link member (17a, 17b) collides with the apparatus around the electric actuator.

  The electric actuator of the third embodiment differs from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 40 and the configuration of the first and second one-way clutches 20, but the other elements are substantially the same. It is configured. For this reason, in the state where the release mechanism 40 is not operated and the state after the release mechanism 40 is operated, the electric actuator of the third embodiment is the electric drive of the first embodiment except for the operation of the link mechanism 17. Acts like an actuator.

  According to the third embodiment described above, similarly to the first embodiment, the output unit 12 can be retracted to the contracted position with respect to the housing 11 even when the screw mechanism 15 is fixed. It is possible to provide an electric actuator that can be simplified and downsized while being possible.

  Furthermore, according to 3rd Embodiment, the pin member 41 is extracted from the through-hole 43 of a some link member (17a, 17b) by operating the operation part 42. FIG. Thereby, connection of a some link member (17a, 17b) is cut | disconnected. Therefore, the release mechanism 40 is realized by a small and simple structure including the pin member 41 and the operation unit 42.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 11 is a schematic diagram showing the link mechanism 17 and the release mechanism 50 of the electric actuator according to the fourth embodiment of the present invention. The electric actuator according to the fourth embodiment is configured in the same manner as the electric actuator 1 of the first embodiment. However, the electric actuator according to the fourth embodiment is different from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 50.

  Hereinafter, regarding the electric actuator according to the fourth embodiment, a configuration different from that of the first embodiment will be described. And in 4th Embodiment, about the element comprised similarly to 1st Embodiment, the code | symbol same as 1st Embodiment is quoted by attaching | subjecting the code | symbol same as 1st Embodiment in drawing. Therefore, explanation is omitted.

  Similar to the first embodiment, the electric actuator according to the fourth embodiment is applied to the moving blade driving mechanism 100 and is configured as an actuator that drives the moving blade 102. The electric actuator according to the fourth embodiment includes a housing 11, an output unit 12, an electric motor 13, a gear mechanism 14, a screw mechanism 15, a support unit 16, a link mechanism 17, a release mechanism 50, a torsion spring 19, and a one-way clutch 20. The position detecting mechanism 21 is provided.

  The release mechanism 50 is provided as a mechanism that can release the restriction on the relative displacement of the support portion 16 with respect to the housing 11 by the link mechanism 17. The release mechanism 50 is driven and operated by, for example, a solenoid mechanism (not shown) having a solenoid and a plunger. When it is detected by the same method as in the first embodiment that the fixed state has occurred in the screw mechanism 15, the solenoid mechanism is excited or demagnetized, and the release mechanism 50 is activated.

  The release mechanism 50 may be configured to be driven and operated by a manual operation by an operator. Alternatively, the release mechanism 50 may be configured to operate by driving by a mechanism other than the solenoid mechanism described above. For example, the release mechanism 50 may be configured to operate by driving by a mechanism having a small electric motor, a rack, a pinion, a link element, and the like.

  As shown in FIG. 11, the release mechanism 50 includes a lever mechanism 51 and a protrusion 52. The release mechanism 50 is installed in the housing 11. In addition, in FIG. 11, the installation form with respect to the housing 11 of the cancellation | release mechanism 50 is typically shown in figure.

  The lever mechanism 51 includes a lever main body 51a and a fulcrum shaft 51b. The lever main body 51a is provided as a rod-shaped member. The fulcrum shaft 51b is provided as a shaft member that supports the lever main body 51a. The lever main body 51a is provided so as to be swingable about a fulcrum shaft 51b. That is, the lever main body 51a is supported to be swingable with respect to the housing 11 via the fulcrum shaft 51b. Further, the lever main body 51a is rotatably attached to the fulcrum shaft 51b at an intermediate position in the longitudinal direction.

  The protrusion 52 is provided at one end of the lever main body 51a. In the present embodiment, the protruding portion 52 is provided integrally with the lever main body 51a. The protruding portion 52 is provided with a protruding portion 52a protruding in a convex shape toward a direction substantially perpendicular to the longitudinal direction of the lever main body 51a or in an oblique direction.

  Further, the protrusion 52 is disposed in the vicinity of the connecting portion 17 c of the link mechanism 17. And the protrusion part 52 is supported in the cancellation | release mechanism 50 so that a displacement is possible so that it may protrude from the housing 11 side toward the connection part 17c. Furthermore, when the protrusion 52 is displaced so as to protrude toward the connecting portion 17c, the protruding portion 52a is configured to bias the connecting portion 17c.

  Moreover, the edge part on the opposite side to the protrusion part 52 side in the lever main-body part 51a is comprised as the power point side part 51c. This power point side portion 51c is connected to the plunger of the solenoid mechanism described above. When it is detected that the screw mechanism 15 is stuck, the solenoid mechanism described above is excited or demagnetized to drive the force point side portion 51c along the arrow A direction in the figure. In addition, the protrusion part 52 is provided in the lever main-body part 51a on the opposite side to the force point side part 51c via the fulcrum shaft 51b. That is, the protrusion 52 is provided on the side of the action point in the lever main body 51a.

  As described above, the lever main body 51a is driven by the solenoid mechanism to swing around the fulcrum shaft 51b and drive the protrusion 52 so as to displace the protrusion 52 in the direction of arrow B in the figure. To do. In this manner, the lever mechanism 51 is configured to drive the protruding portion 52 so as to protrude toward the connecting portion 17c. That is, the lever mechanism 51 constitutes a protruding drive unit in the present embodiment. Note that a configuration including a solenoid mechanism in addition to the lever mechanism 51 may be configured as a protruding drive unit.

  When the lever mechanism 51 swings as described above, the release mechanism 50 operates. When the release mechanism 50 is operated, the protruding portion 52 is driven by the lever mechanism 51 and protrudes toward the connecting portion 17c, so that the connecting portion 17c is further urged while being in contact with the connecting portion 17c. To do. Thereby, the protrusion part 52 urges | biases the connection part 17c so that the link mechanism 17 may be bent.

  The electric actuator of the fourth embodiment differs from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 50, but the other elements are configured in the same manner. For this reason, the electric actuator of the fourth embodiment operates in the same manner as the electric actuator 1 of the first embodiment in a state where the release mechanism 50 is not operated and a state after the release mechanism 50 is operated.

  According to the fourth embodiment described above, similarly to the first embodiment, the output unit 12 can be retracted to the contracted position with respect to the housing 11 even when the screw mechanism 15 is fixed. It is possible to provide an electric actuator that can be simplified and downsized while being possible.

  Furthermore, according to the fourth embodiment, the protrusion 52 driven by the lever mechanism (protrusion drive unit) 51 protrudes toward the connecting portion 17c of the link mechanism 17 and biases the connecting portion 17c. Thereby, the link mechanism 17 bends. Therefore, the release mechanism 50 is realized by a small and simple structure including the lever mechanism (projection drive unit) 51 and the projection unit 52.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. FIG. 12 is a schematic diagram showing the link mechanism 17 and the release mechanism 60 of the electric actuator according to the fifth embodiment of the present invention. The electric actuator according to the fifth embodiment is configured in the same manner as the electric actuator 1 of the first embodiment. However, the electric actuator according to the fifth embodiment is different from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 60.

  Hereinafter, regarding the electric actuator according to the fifth embodiment, a configuration different from that of the first embodiment will be described. And in 5th Embodiment, about the element comprised similarly to 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected by attaching | subjecting the code | symbol same as 1st Embodiment in drawing. Therefore, explanation is omitted.

  Similar to the first embodiment, the electric actuator according to the fifth embodiment is applied to the moving blade drive mechanism 100 and is configured as an actuator that drives the moving blade 102. And the electric actuator which concerns on 5th Embodiment is the housing 11, the output part 12, the electric motor 13, the gear mechanism 14, the screw mechanism 15, the support part 16, the link mechanism 17, the release mechanism 60, the torsion spring 19, and the one-way clutch 20. The position detecting mechanism 21 is provided.

  The release mechanism 60 is provided as a mechanism that can release the restriction on the relative displacement of the support portion 16 with respect to the housing 11 by the link mechanism 17. The release mechanism 60 is driven and operated by manual operation. When an operator (not shown) grasps that a fixed state has occurred in the screw mechanism 15, the release mechanism 60 is manually operated.

  As shown in FIG. 12, the release mechanism 60 includes a protruding portion 61 and a protruding drive portion 62. The release mechanism 60 is installed in the housing 11. In addition, in FIG. 12, the installation form with respect to the housing 11 of the cancellation | release mechanism 60 is typically shown in figure.

  The protruding portion 61 is fixed to the screw shaft portion 62 a in a state of protruding from the tip end portion of the screw shaft portion 62 a of the protruding drive portion 62. And the protrusion part 61 is supported with respect to the screw shaft part 62a so that rotation with the screw shaft part 62a is possible. Further, the protruding portion 61 is formed such that the end portion on the tip side opposite to the side fixed to the screw shaft portion 62a forms a part of a spherical surface.

  Further, the protruding portion 61 is disposed in the vicinity of the connecting portion 17 c of the link mechanism 17. And the edge part by the side of the front-end | tip of the protrusion part 61 is arrange | positioned so that it can contact | abut from the housing 11 side with respect to the connection part 17c. Further, the projecting portion 62 is supported by the release mechanism 50 so as to be displaceable so as to project from the housing 11 side toward the connecting portion 17c. And when the protrusion part 62 is displaced so that it may protrude toward the connection part 17c, it is comprised so that the connection part 17c may be urged | biased in the edge part of the front end side.

  The protrusion drive unit 62 is provided as a mechanism that drives the protrusion 61 to protrude toward the connecting portion 17 c of the link mechanism 17. The protrusion drive unit 62 includes a screw shaft portion 62a, a rotating plate 62b, a handle 62c, and the like.

  The screw shaft portion 62a is provided as a shaft member having a male screw portion provided on the outer periphery. The male screw portion of the screw shaft portion 62a is in a female screw hole (not shown) provided in the housing 11 or in a female screw hole (not shown) provided in a member (not shown) attached to the housing 11. On the other hand, it is provided so as to be screwed together. The female screw hole is provided as a through hole. The screw shaft portion 62a is screwed into the female screw hole in a state where it can penetrate the female screw hole.

  The screw shaft portion 62a is installed so as to extend along a direction orthogonal to the linearly extending link mechanism 17 while being screwed into the female screw hole. Further, as described above, the protruding portion 61 is fixed to the end portion on the distal end side of the screw shaft portion 62a. And the protrusion part 61 is arrange | positioned in the state exposed outside from said female screw hole. Further, the protruding portion 61 is disposed at a position facing the connecting portion 17 c of the link mechanism 17. With the above configuration, the screw shaft portion 62a is provided so as to be relatively displaced with respect to the housing 11 and to protrude toward the connecting portion 17c by rotating in a state of being screwed into the female screw hole.

  The rotating plate 62b is fixed to the screw shaft portion 62a at an end portion opposite to the end portion of the screw shaft portion 62a to which the protruding portion 61 is attached. The rotating plate 62b is provided as a plate-like member having a rectangular front and back surfaces, for example. The rotating plate 62b is fixed to the screw shaft portion 62a so that the surface direction extending in a plate shape extends perpendicularly to the central axis of the screw shaft portion 62a. The rotating plate 62b is fixed to the screw shaft portion 62a on one end side in the longitudinal direction.

  The handle 62c is provided as a part for the operator to hold and operate when a manual operation is performed by the operator. The handle 62c is provided, for example, as an elongated cylindrical portion so that the operator can easily grasp it. The handle 62c is fixed with respect to the rotating plate 62b. The handle 62c is fixed to the rotating plate 62b on the end side opposite to the end side attached to the screw shaft portion 62a in the longitudinal direction of the rotating plate 62b.

  The handle 62c is attached to the rotating plate 62b so as to protrude from the opposite side to the screw shaft portion 62a. That is, the handle 62c is attached to the rotating plate 62b so as to protrude from the surface opposite to the side from which the screw shaft portion 62a protrudes on the front and back surfaces of the rotating plate 62b. Further, the handle 62c is attached to the rotating plate 62b so that the longitudinal direction of the cylindrical handle 62c is set in parallel to the central axis direction of the screw shaft portion 62a. The handle 62c and the rotating plate 62b are installed in the housing 11 in a state where the handle 62c and the rotating plate 62b are exposed to the outside of the housing 11 so that an operator can rotate them around the screw shaft portion 62a.

  When the operator operates the handle 62c and the handle 62c and the rotating plate 62b rotate about the screw shaft portion 62a, the release mechanism 60 operates. By rotating the handle 62c in a predetermined direction, the screw shaft portion 62a that is screwed into the female screw hole is displaced relative to the housing 11 while changing the position of screwing into the female screw hole. . Then, the screw shaft portion 62a protrudes toward the connecting portion 17c of the link mechanism 17. The protruding portion 61 is driven by the protruding driving portion 62 as described above and protrudes toward the connecting portion 17c, and further biases the connecting portion 17c while being in contact with the connecting portion 17c. Thereby, the protrusion part 61 urges | biases the connection part 17c so that the link mechanism 17 may be bent.

  The electric actuator of the fifth embodiment differs from the electric actuator 1 of the first embodiment in the configuration of the release mechanism 60, but the other elements are configured in the same manner. For this reason, in the state where the release mechanism 60 is not operated and the state after the release mechanism 60 is operated, the electric actuator of the fifth embodiment operates in the same manner as the electric actuator 1 of the first embodiment.

  According to the fifth embodiment described above, similarly to the first embodiment, the output unit 12 can be retracted to the contracted position with respect to the housing 11 even when the screw mechanism 15 is fixed. It is possible to provide an electric actuator that can be simplified and downsized while being possible.

  Furthermore, according to the fifth embodiment, the protruding portion 61 driven by the protruding drive portion 62 protrudes toward the connecting portion 17c of the link mechanism 17 and biases the connecting portion 17c. Thereby, the link mechanism 17 bends. Therefore, the release mechanism 60 is realized by a small and simple structure that includes the protruding portion 61 and the protruding drive portion 62.

(Modification)
The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, the following modifications may be made.

(1) In the above-described embodiment, the configuration configured as the electric actuator in the moving blade driving mechanism for driving the moving blade of the aircraft has been described as an example, but this need not be the case. The present invention can be widely applied as an electric actuator that has a screw mechanism and converts a rotational driving force output by an electric motor into a linear driving force for output.

(2) In the above-described embodiment, the second screw rotatably supported by the support portion rotates and the first screw is displaced in the axial direction with respect to the second screw and the support portion. This does not have to be the case. A modification in which the first screw rotatably supported by the support portion rotates and the second screw is displaced in the axial direction with respect to the first screw and the support portion may be implemented. In the case of this modification, the driving force from the electric motor is input to the first screw, and the second screw is connected to the output unit.

(3) In the above-described embodiment, the number of link members in the link mechanism has been described as an example of two, but this need not be the case. A modification of the link mechanism having three or more link members may be implemented. In the case of this modification, the number of release mechanisms may be set corresponding to the number of connecting portions in the link mechanism.

(4) In the above-described embodiment, the screw mechanism having the first and second screws has been described as an example having the configuration of the ball screw mechanism. However, this need not be the case. That is, the screw mechanism having the first and second screws may be implemented as a configuration having a configuration other than the ball screw mechanism. For example, a screw mechanism configured to screw the first screw and the second screw may be implemented. Or the screw mechanism which has a 1st and 2nd screw may be implemented as a form provided with the structure of the roller screw mechanism. In the case of the roller screw mechanism, a plurality of screw-like roller shafts each having a spiral groove on the outer periphery are rotatably installed between the first screw and the second screw. As the first screw or the second screw rotates, each roller shaft meshes with the first screw and the second screw in a spiral groove and rotates around each axis.

(5) In the above-described embodiment, an example in which a gear mechanism that has a plurality of spur gears and transmits the rotational driving force of the electric motor to the screw mechanism is provided between the electric motor and the screw mechanism will be described. However, this need not be the case. A mode in which a gear mechanism having a gear other than a spur gear is provided between the electric motor and the screw mechanism may be implemented. Moreover, the pinion is provided in the edge part of the output shaft of an electric motor, and the form by which the rotational drive force of an electric motor is transmitted to a screw mechanism via this pinion may be implemented.

(6) The release mechanism is not limited to the form exemplified in the first to fifth embodiments, and may be implemented with various changes. That is, the release mechanism only needs to be configured as a mechanism that can bend the link mechanism or a mechanism that can disconnect a plurality of link members in the link mechanism.

  The present invention can be widely applied to an electric actuator that has a screw mechanism and converts a rotational driving force output by an electric motor into a linear driving force and outputs the linear driving force.

DESCRIPTION OF SYMBOLS 1 Electric actuator 11 Housing 12 Output part 13 Electric motor 16 Support part 17 Link mechanism 17a, 17b Link member 18 Release mechanism 22 1st screw 23 2nd screw

Claims (8)

An electric motor;
A housing;
An output portion that protrudes relative to the housing and is capable of relative displacement;
A first screw at least partially housed in the housing;
The first screw has a cylindrical portion installed inside, and is attached to the first screw so as to be relatively rotatable about the axis of the first screw, and the first screw is rotated relative to the first screw. A second screw that is axially displaceable relative to one screw;
A support portion that rotatably supports one of the first screw and the second screw;
A link that has a plurality of link members, connects the support portion and the housing, and is capable of restricting relative displacement of the support portion with respect to the housing in a state where the plurality of linked link members extend linearly. Mechanism,
A release mechanism capable of releasing restriction of relative displacement of the support portion relative to the housing by the link mechanism;
With
A driving force from the electric motor is input to one of the first screw and the second screw,
The other of the first screw and the second screw is connected to the output unit,
The link mechanism has one end rotatably connected to the support and the other end rotatably connected to the housing.
The link mechanism is in a bent state at a connection position of the plurality of link members connected to allow the relative displacement of the support portion with respect to the housing by the operation of the release mechanism or the plurality of the links. An electric actuator characterized in that the connection of members is cut off. The electric actuator according to claim 1,
The release mechanism includes a projecting portion supported to be displaceable so as to project from the housing side toward a connecting portion that is a portion to which the plurality of link members in the link mechanism are connected, and the projecting portion is A projecting drive unit that is driven to project toward the coupling part, and
The electric actuator according to claim 1, wherein the protruding portion is driven by the protruding driving unit and protrudes toward the connecting portion to bias the connecting portion so as to bend the link mechanism. The electric actuator according to claim 2,
The protruding drive part is provided as a solenoid,
The electric actuator according to claim 1, wherein the protruding portion is provided as a plunger that protrudes from the solenoid toward the connecting portion when the solenoid is excited or demagnetized. The electric actuator according to claim 1,
The release mechanism includes a cam member that is rotatably supported and provided with an eccentric portion, and a rotation drive unit that rotationally drives the cam member.
The eccentric part is a part of the outer peripheral part of the cam member and is provided as a part formed such that the distance dimension from the rotation center position of the cam member to the outer peripheral position is larger than the other part of the outer peripheral part. And
When the rotation drive unit is operated and the cam member is rotated, the eccentric portion is connected to a connecting portion where the plurality of link members in the link mechanism are connected so that the link mechanism is bent. An electric actuator characterized by energizing. The electric actuator according to claim 1,
The release mechanism penetrates through holes provided in each of the plurality of link members and connects the plurality of link members, and the pin member is provided integrally with or attached to the pin member. An operable operation unit,
The operation of the operation unit is performed such that the pin member is extracted from the through-holes of the plurality of link members, so that the connection of the plurality of link members is disconnected. Electric actuator. The electric actuator according to any one of claims 1 to 5,
The support part is
A cylindrical structure part that is formed in a cylindrical shape and on which one of the first screw and the second screw is disposed, and
A bearing portion that rotatably supports one outer periphery of the first screw and the second screw with respect to an inner periphery of the cylindrical structure portion;
The electric actuator characterized by having. The electric actuator according to any one of claims 1 to 6,
In a state where the relative displacement of the support portion with respect to the housing is restricted by the link mechanism, a connecting portion that is a portion to which the plurality of link members in the link mechanism are connected is pressed toward the housing. An electric actuator, further comprising a spring member that applies torque to any of the plurality of link members. The electric actuator according to claim 7,
The spring member is provided as a coil spring,
When the release mechanism releases the restriction of the relative displacement of the support portion relative to the housing by the link mechanism, and the link mechanism is bent, the coil spring is configured so that the connecting portion is separated from the housing. An electric actuator, wherein a torque having a magnitude corresponding to a displacement amount is applied to any one of the plurality of link members.

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