JP2012073135A - Position detector for actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detector for an actuator which improves reliability by redundancy, prevents structure from being enlarged and complicated, and can suppress an increase in the number of components and cost.SOLUTION: A probe 12 is fixed to a piston 104. A core 13 is fixed to the probe 12. A case 14 is fixed to a cylinder 103 and the core 13 is arranged inside the case 14. A position detection signal output part 15 includes a primary and a secondary coils (22, 23) which are held by the case 14 and inside of which the core 13 is displaceably arranged. A signal, based on induced voltage generated at the secondary coil 23 due to displacement of the core 13 in a state where the primary coil 22 is excited, is output as a position detection signal. The probe 12 comprises multiple probe members (17, 18) which are concentrically arranged and mutually fixed. And the multiple probe members (17, 18) are fixed to the core 13 respectively.

Description

  The present invention relates to an actuator position detector that is used in an actuator that operates when a piston provided on a rod is displaced in a cylinder to drive aircraft equipment, and detects the position of the piston or the rod with respect to the cylinder.

  Conventionally, an actuator that detects the position of a piston or a rod relative to a cylinder has been used in an actuator that drives an aircraft device by operating a piston provided on a rod in a cylinder. . As such an actuator position detector, an LVDT (linear variable differential transformer) as disclosed in Patent Document 1 can be used.

  As shown in FIG. 3 of Patent Document 1, the LVDT disclosed in Patent Document 1 is arranged inside a primary coil (primary coil 132) and secondary coils (secondary coils 134 and 136) arranged on both sides thereof. A movable core (core or armature 20) is disposed so as to be displaceable. In the LVDT, a signal proportional to the displacement of the core is output as a signal based on the induced voltage generated in the secondary coil. The core is fixed to the tip of a probe (shaft 22) formed as a single shaft and is configured to be displaced together with the probe.

US Pat. No. 6,605,940

  In an actuator for driving an aircraft device, the position of a piston or a rod relative to a cylinder can be detected by using the LVDT disclosed in Patent Document 1 as an actuator position detector. In this case, the coil assembly having the primary coil and the secondary coil is fixed to the cylinder, and the probe having the core provided at the tip is fixed to the piston or the rod.

  However, since the LVDT disclosed in Patent Document 1 has a structure in which a core is fixed to an end of a probe formed as a single shaft, the position of a piston or a rod is detected when the probe is damaged. It becomes impossible to do so, or erroneous detection is caused. For this reason, in order to improve reliability by redundancy, it is necessary to install a plurality of LVDTs disclosed in Patent Document 1 for one actuator. However, when an actuator position detector provided with a plurality of LVDTs of Patent Document 1 is installed for one actuator, the structure of the actuator position detector is increased in size and complexity. In addition, the number of parts and the cost will be increased.

  In view of the above circumstances, the present invention can improve the reliability by redundancy, suppress the increase in size and complexity of the structure, and suppress the increase in the number of parts and the cost. An object of the present invention is to provide a position detector.

  The actuator position detector according to the first aspect of the present invention for achieving the above object is used for an actuator that operates when a piston provided on a rod is displaced in a cylinder to drive aircraft equipment. Alternatively, the present invention relates to an actuator position detector that detects the position of a rod. The actuator position detector according to the first aspect of the present invention is a probe fixed to the piston or the rod and displaced together with the piston and the rod, and a core that is a movable iron core fixed to the probe and displaced together with the probe. A case in which the core is fixed to the cylinder and the core is disposed inside, and a coil that is held by the case and is disposed so that the core can be displaced inside, and the position of the piston or the rod A position detection signal output unit that outputs a detection signal, and the position detection signal output unit includes a primary coil provided as a primary coil that is excited by applying an input voltage, and the primary coil. A secondary coil provided as a secondary coil in which an induced voltage is generated by the displacement of the core in a state where is excited A signal based on the induced voltage generated in the secondary coil is output as the position detection signal, and the probe has a plurality of probe members arranged concentrically and fixed to each other. The probe members are respectively fixed to the core.

  According to the present invention, an induced voltage is generated in the secondary coil by displacing the core while the primary coil is excited, and a signal based on the induced voltage is output as a position detection signal for the piston or rod. According to the present invention, the probe that supports the core that displaces inside the coil and that displaces together with the piston and the rod has a plurality of probe members fixed to each other, and the plurality of probe members are attached to the core. Each is fixed. For this reason, multiplexing of probes is achieved, and even when damage occurs in any of the plurality of probe members, the core is supported in a normal state by other probe members. And it is prevented that it becomes impossible to detect the position of a piston or a rod, or it causes an erroneous detection. Therefore, reliability is improved by redundancy. Further, the plurality of probe members in the probe are arranged concentrically and fixed to each other. As a result, the probes can be multiplexed with a very compact structure in a space efficient manner. In addition, since the probes are multiplexed in a compact manner, the reliability is improved by redundancy, so that the structure can be prevented from becoming large and complicated, and the increase in the number of parts and the cost can be suppressed. Can do.

  Therefore, according to the present invention, it is possible to improve the reliability by redundancy, suppress the increase in size and complexity of the structure, and also suppress the increase in the number of parts and the cost. Can be provided.

  The actuator position detector according to a second aspect of the invention is the actuator position detector of the first aspect of the invention, wherein the plurality of probe members are provided as parts to be fixed to each other by welding, The second welded portion provided as a portion where the probe member and the core are fixed to each other by welding is provided as a different welded portion.

  According to the present invention, the first welded portion where each probe member is fixed by welding and the second welded portion where each probe member and the core are fixed by welding are provided as different welded portions. A welding condition suitable for welding the probe members and a welding condition suitable for welding the probe member and the core can be set individually.

  The actuator position detector according to a third aspect of the present invention is the actuator position detector of the first aspect or the second aspect, wherein the plurality of probe members are fixed to each other, the plurality of probe members and the core. In the parts fixed to each other, a part fixed by welding and a part fixed by screw connection are provided.

  According to the present invention, a portion where each probe member is fixed and a portion where each probe member and the core are fixed are provided with a portion fixed by welding and a portion fixed by screw connection. The fixing means can be set redundantly for welding and screw connection. As a result, the reliability can be improved by further redundancy.

  The actuator position detector according to a fourth aspect of the present invention is the actuator position detector according to the third aspect of the present invention, wherein as the plurality of probe members, an inner probe member formed in a shaft shape and a tubular shape formed as the inner probe member are provided. And an outer probe member arranged concentrically with the inner probe member, and the inner probe member and the core are fixed by screw connection and also fixed by welding. The outer probe member and the core are fixed by welding, and the inner probe member and the outer probe member are fixed by welding.

  According to the present invention, the cylindrical outer probe member is concentrically arranged outside the shaft-like inner probe member, and the probe can be duplicated with a compact structure. The inner probe member and the outer probe member, and the outer probe member and the core are fixed by welding, and the inner probe member and the core are fixed by welding and screw connection. Therefore, the fixing means can be efficiently made redundant.

  The actuator position detector according to a fifth aspect of the present invention is the actuator position detector according to the first aspect of the present invention, wherein a plurality of the probe members are fixed to each other by welding, a plurality of the probe members, and the core. And a welded portion fixed by welding are provided as an integral welded portion.

  According to the present invention, since the welded portions of the probe members and the welded portions of the probe members and the core are provided as an integral welded portion, it is possible to efficiently perform the fixing work by welding the plurality of probe members and the core. Can do.

  The actuator position detector according to a sixth aspect of the present invention is the actuator position detector according to any one of the first to fifth aspects of the invention, wherein the case includes a plurality of case members arranged concentrically and fixed to each other. It is characterized by having.

  According to the present invention, since the case that holds the coil and is fixed to the cylinder has the plurality of case members fixed to each other, the cases can be multiplexed. For this reason, even if damage occurs in any of the plurality of case members, the coil is held in a normal state by the other case members. And it is prevented that it becomes impossible to detect the position of a piston or a rod, or it causes an erroneous detection. Therefore, reliability is improved by redundancy. Further, the plurality of case members in the case are arranged concentrically and fixed to each other. For this reason, the case can be multiplexed in a space-efficient and very compact structure.

  An actuator position detector according to a seventh aspect of the present invention is the actuator position detector of the sixth aspect of the present invention, wherein the plurality of case members include a cylindrical inner case member and a cylindrical inner case member. An outer case member disposed outside the member and concentrically with the inner case member, wherein the primary coil and the second coil are disposed between the inner case member and the second outer case member. The next coil is held.

  According to the present invention, the cylindrical outer case member is concentrically disposed outside the cylindrical inner case member, and the case can be duplicated with a compact structure. In addition, since the primary and secondary coils are held between the inner case member and the outer case member, the coils are arranged in a space-efficient manner in the case where the duplication is achieved.

  According to the present invention, there is provided an actuator position detector capable of improving reliability by redundancy, suppressing an increase in size and complexity of a structure, and suppressing an increase in the number of parts and cost. can do.

1 is a diagram schematically showing a system in which an actuator using an actuator position detector according to an embodiment of the present invention drives a control surface of an aircraft. It is a figure which shows the cross section of the actuator shown in FIG. 1, and the position detector for actuators. FIG. 3 is a diagram schematically showing the actuator position detector shown in FIG. 2 in a state including a partial cross section. It is sectional drawing which shows the probe and core in the position detector for actuators shown in FIG. It is an expanded sectional view which expands and shows a part in FIG. It is a figure which shows typically the positional relationship of the coil of a position detection signal output part in the position detector for actuators shown in FIG. 3, a probe, and a core. It is a figure which shows typically the positional relationship of the coil of a position detection signal output part in the position detector for actuators shown in FIG. 3, a probe, and a core. It is a figure which shows typically the positional relationship of the coil of a position detection signal output part in the position detector for actuators shown in FIG. 3, a probe, and a core. It is sectional drawing which shows the probe and core in the position detector for actuators concerning a modification.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. This embodiment is used for an actuator that drives an aircraft device by operating when a piston provided on a rod is displaced in the cylinder, and detects the position of the piston or the rod relative to the cylinder. As for the vessel, it can be widely applied.

  First, an actuator using an actuator position detector will be described. FIG. 1 is a diagram schematically showing a system in which an actuator 100 using an actuator position detector 1 according to an embodiment of the present invention drives a control surface 101 of an aircraft. The actuator 100 is provided as a hydraulically operated actuator that drives a control surface 101 of an aircraft (not shown). The control surface 101 is provided as a moving blade (control blade surface) of an aircraft. For example, it is provided on an aileron (auxiliary wing) provided on a main wing, an elevator (elevator) provided on a horizontal tail, or a vertical tail. Configured as a rudder, etc. Further, FIG. 1 illustrates a mode in which one control surface 101 is driven by a plurality of actuators 100.

  The actuator 100 is connected to the control surface 101 and is configured as a cylinder mechanism capable of driving the control surface 100. The actuator 100 includes a rod 102, a cylinder 103 in which the rod 102 is movable in the axial direction, and a piston 104 provided on the rod 102. The inside of the cylinder 103 is partitioned into a pair of oil chambers (105a, 105b) by a piston 104. The actuator 100 is operated by the piston 104 fixed to the rod 102 being displaced in the cylinder 103 by supplying and discharging the pressure oil to and from the pair of oil chambers (105a, 105b). It is comprised so that the control surface 101 which is an apparatus may be driven.

  As shown in the schematic diagram of FIG. 1, in the system for controlling the operation of the actuator 100 that drives the control surface 101 of the aircraft, a pair of oil chambers (105a, 105b) in the actuator 100, a hydraulic source 106, and a reservoir A hydraulic circuit configured to be able to communicate with the circuit 107 is provided. In FIG. 1, as a system for controlling the operation of the actuator 100, a system corresponding to one of the two actuators (100, 100) for driving the control surface 101 is illustrated, and the other actuator is illustrated. The system corresponding to 100 is not shown.

  The hydraulic source 106 includes a hydraulic pump that supplies pressure oil (hydraulic oil), and is installed on the aircraft body side (not shown). The reservoir circuit 107 includes a tank (not shown) in which the pressure oil supplied from the hydraulic source 106 as pressure oil and discharged from the actuator 100 returns and communicates with the hydraulic source 106. It is configured. Note that a hydraulic pressure source and a reservoir circuit (not shown) provided in a system independent of the hydraulic pressure source 106 and the reservoir circuit 107 connected to one of the two actuators (100, 100) are connected to the other. The actuator 100 is connected. The hydraulic power source 106 and the reservoir circuit 107 are also connected to an actuator (not shown) that drives a control surface (not shown) other than the control surface 100.

  A control valve 108 is provided in the hydraulic circuit between the hydraulic source 106 and the reservoir circuit 107 and the actuator 100. The control valve 108 is connected to the hydraulic source 106 via a supply oil passage 106 a provided as an oil passage for supplying pressure oil from the hydraulic source 106. Further, the control valve 108 is connected to the reservoir circuit 107 via a discharge oil passage 107 a provided as an oil passage for discharging the pressure oil discharged from the control valve 108 to the reservoir circuit 107.

  Further, a supply / discharge oil passage (109a, 109b) is provided between the actuator 100 and the control valve. The supply / discharge oil passage 109 a is provided as an oil passage connecting the control valve 108 and one oil chamber 105 a of the actuator 100, and the supply / discharge oil passage 109 b connects the control valve 108 and the other oil chamber 105 b of the actuator 100. It is provided as a connecting oil passage. These supply / discharge oil passages (109a and 109b) are provided as oil passages through which the pressure oil supplied from the hydraulic source 106 and the pressure oil discharged to the reservoir circuit 107 flow.

  As described above, the control valve 108 connected to the supply oil passage 106a, the discharge oil passage 107a, and the supply / discharge oil passage (109a, 109b) supplies and supplies each of the pair of oil chambers (105a, 105b) in the actuator 100. It is provided as an electric oil servo valve that switches the path of the discharged pressure oil and controls the operation of the actuator 100. The control valve 108 is driven based on a command signal (command signal indicated by a symbol S1 in FIG. 1) from an actuator controller 111 that controls the operation of the actuator 100. Then, the actuator controller 111 controls the actuator 100 based on a command signal (command signal indicated by a symbol S <b> 2 in FIG. 1) from the flight controller 110 that is a higher-order computer that commands the operation of the control surface 101. The flight controller 110 includes, for example, a CPU (Central Processing Unit), a memory, an interface, and the like (not shown).

  Here, the structure of the actuator 100 will be described in more detail. FIG. 2 is a diagram illustrating a cross section of the actuator 100 and the actuator position detector 1, and is a diagram illustrating the structure of the actuator 100 and the installation form of the actuator position detector 1 with respect to the actuator 100. As shown in FIG. 2, the cylinder 103 is formed by a first cylinder member 103a, a second cylinder member 103b, and a third cylinder member 103c being fixed and integrated with each other.

  The first cylinder member 103a is provided as a cylindrical member formed so that a bottom portion is provided on one end side and the other end side is opened. The second cylinder member 103b is provided as a cylindrical member that fits inside the opening end of the first cylinder member 103a and is fixed to the first cylinder member 103a. The third cylinder member 103c is provided as a cylindrical member that fits inside the second cylinder member 103b and is fixed to the second cylinder member 103b. A cylindrical portion 104b of the piston 104 is slidably inserted into the inner peripheral wall of the third cylinder member 103c. The first to third cylinder members (103a, 103b, 103c) may be further fixed by fixing means such as welding or bolts in addition to the fitting. The cylinder 103 is configured to be pivotably attached to an aircraft wing (not shown) at the bottom of the first cylinder member 103a.

  The piston 104 that divides the pair of oil chambers (105a, 105b) in the cylinder 103 has a disk part 104a provided as a disk-shaped part with a hole formed in the center, and a disk part 104a formed in a cylindrical shape. And a cylindrical portion 104b formed integrally with each other. The disc portion 104a is disposed on the inner side of the first cylinder member 103a on the outer peripheral side thereof so as to be slidable with respect to the inner peripheral wall of the first cylinder member 103a of the cylinder 103. The cylindrical portion 104b is provided so as to protrude from one end surface side of the disk portion 104a, and penetrates the third cylinder member 103c while being slidably contactable with the inner peripheral surface of the third cylinder member 103c of the cylinder 103. Has been placed. A partition 104d that partitions the bottom portion of the hole 104c communicating with the oil chamber 105b in the tubular portion 104b is provided inside the tubular portion 104b.

  The rod 102 is provided with an attachment portion 102a provided as a portion that is rotatably attached to the rudder surface 101, and a shaft portion 102b provided as an axial portion protruding from the attachment portion 102a. Yes. The rod 102 is coaxially fixed in series with the cylindrical portion 104b of the piston 104 at the shaft portion 102b. Various forms of fixing the rod 102 and the piston 104 can be selected. In the example shown in FIG. 2, the shaft portion 102 b is screwed into the cylindrical portion 104 b, and the tube is fixed by the fixing ring 112 and the key member 113. The form fixed to the shape part 104b is illustrated. The key member 113 is provided as a member that restricts the relative rotation of the cylindrical portion 104b and the shaft portion 102b by key coupling. Further, the fixing ring 112 is screwed on the outer side of the key member 113 to the male screw portion of the shaft portion 102b which is provided with a female screw portion on the inner periphery and is screwed to the cylindrical portion 104b. It is provided as a member that contacts and fastens the shaft portion 102b to the cylindrical portion 104b.

  Next, the actuator position detector 1 according to this embodiment will be described in detail. FIG. 3 is a diagram schematically showing the actuator position detector 1 in a state including a partial cross section. The actuator position detector 1 shown in FIGS. 1 to 3 is provided in the actuator 100 and is provided as a position detector that detects the position of the piston 104 or the rod 102 with respect to the cylinder 103. In this embodiment, the position detector 1 for actuators which detects the position of the piston 104 with respect to the cylinder 103 is illustrated. The actuator position detector 1 includes a housing 11, a probe 12, a core 13, a case 14, a position detection signal output unit 15, and the like. In addition, illustration of the housing 11 is abbreviate | omitted in FIG.

  The housing 11 shown in FIG. 2 is provided as a cylindrical structural member that accommodates and holds the case 14, is disposed inside the cylinder 103, and is fixed to the bottom portion of the first cylinder member 103a at one end. . Note that a power cable 16 for energizing a position detection signal output unit 15 to be described later extends so as to be drawn out from the housing 11, and this power cable 16 passes through the bottom portion of the first cylinder member 103a and is connected to the cylinder. It is arranged so as to extend to the outside of 103. Further, the probe 12 is arranged in a protruding state on the end portion side opposite to the side fixed to the cylinder 103 in the housing 11. A seal member (not shown) that prevents leakage of pressure oil is disposed between the housing 11 and the first cylinder member 103a to which the housing 11 is fixed. The probe 12 is slidably installed on the end of the housing 11 via a seal member (not shown).

  FIG. 4 is a cross-sectional view showing the probe 12 and the core 13. The probe 12 shown in FIGS. 2 to 4 has a plurality of probe members (17, 18) arranged concentrically and fixed to each other. The probe 12 is fixed to the piston 104 and is configured to be displaced together with the piston 104 and the rod 102. The plurality of probe members (17, 18) are fixed to the core 13 described later. The probe 12 includes an inner probe member 17 formed in a shaft shape and an outer probe member 18 formed in a tubular shape as a plurality of probe members (17, 18). The inner probe member 17 and the outer probe member 18 are made of, for example, SUS300 stainless steel.

  The inner probe member 17 is provided with a shaft portion 17 a formed as a cylindrical shaft portion, and a piston fixing portion 17 b that is integrally formed with the shaft portion 17 a and is fixed to the piston 104. A tip projection 17c, which is a cylindrical projection-like portion extending in a stepped diameter, is provided at the end of the shaft 17a opposite to the side where the piston fixing portion 17b is integrally formed. In addition, a male screw portion that is screwed into the core 13 is provided on the outer periphery of the tip protrusion portion 17c.

  The piston fixing portion 17b of the inner probe member 17 is provided as a cylindrical portion having a diameter larger than that of the shaft portion 17a, and a male screw portion that is screwed to the piston 104 is provided on the outer periphery thereof. A male screw portion on the outer periphery of the piston fixing portion 17b is configured to be screwed into a female screw portion provided on the inner periphery of a hole formed in the partition portion 104d of the piston 104. The probe 12 is fixed to the piston 104 by screwing the male screw portion on the outer periphery of the piston fixing portion 17b and the female screw portion on the inner periphery of the hole of the partition portion 104d.

  In addition, the portion of the end of the piston fixing portion 17b that is continuous with the shaft portion 17a is a flange-shaped portion that is formed as a disk flange-like portion having a larger diameter than the portion of the piston fixing portion 17b provided with the male screw portion. A portion 17d is provided. The probe 12 is fixed to the piston 104 in a state where the piston fixing portion 17d is screwed into the partition portion 104d and the flange-shaped portion 17d is in contact with and tightened against the partition portion 104d.

  The outer probe member 18 is formed as a cylindrical member, is disposed outside the shaft portion 17 a of the inner probe member 17, and is disposed concentrically with the inner probe member 17. That is, the shaft portion 17a is inserted inside the outer probe member 18, and the outer probe member 18 is in a state where the center line direction of the cylindrical outer probe member 18 and the center line direction of the shaft inner probe member 17 coincide. Is disposed with respect to the inner probe member 17.

  The core 13 is provided as a cylindrical member, and is configured as a movable iron core that is fixed to the probe 12 and displaced together with the probe 12. The core 13 is formed of, for example, permalloy, which is an Fe—Ni alloy, or electromagnetic soft iron. The core 13 is formed with a female screw hole 13a that opens to one end side. The female screw hole 13a is internally threaded with a male screw portion on the outer periphery of the tip projection 17c. A part is provided.

  Here, a fixed form of the plurality of probe members (17, 18) and a fixed form of the plurality of probe members (17, 18) and the core 13 will be described. FIG. 5 is an enlarged sectional view showing a part of FIG. 4 in an enlarged manner. 5A shows an enlarged view of the fixing positions of the plurality of probe members (17, 18) and the core 13, and FIG. 5 (b) shows the relationship between the plurality of probe members (17, 18). The fixed part is shown enlarged.

  As shown in FIG.4 and FIG.5, in the probe 12 and the core 13, the 1st welding part 19 and the 2nd welding part (20, 21) provided as a different welding part are provided. The first welded portion 19 is provided as a portion where a plurality of probe members (17, 18) are fixed to each other by welding. The second welded portions (20, 21) are provided as portions where the plurality of probe members (17, 18) and the core 13 are fixed to each other by welding.

  In this embodiment, the 1st welding part 19 is provided as a part to which the edge part of the outer probe member 18 and the flange-shaped part 17d of the inner probe member 17 were fixed by welding. The first welded portion 19 includes, for example, an end portion of the outer probe member 18 and a flange-shaped portion 17d of the inner probe member 17 by welding by brazing, electron beam welding, or laser beam welding using a YAG laser or the like. It is formed as a part which joins.

  The second welded portion (20, 21) is a portion where the outer probe member 18 and the core 13 are joined together, the second welded portion 20 where the inner probe member 17 and the core 13 are joined. A second welded portion 21 is provided. The second welded portion 20 is provided as a portion where the end of the outer probe member 18 and the end of the core 13 are fixed by welding. The second welded portion 21 is provided as a portion in which the root portion of the tip projection 17c in the inner probe member 17 and the end portion of the core 13 are fixed by welding.

  In addition, a groove 17e formed in a notch shape is provided at the base portion of the tip protrusion 17c of the inner probe member 17. And when the 2nd welding part 21 is formed, welding will be performed via the groove part 17e in the state in which the female screw hole 13a of the core 13 was screwed by the front-end | tip protrusion part 17c. The second welded portions (20, 21) are formed by, for example, brazing, electron beam welding, or laser beam welding using a YAG laser, the outer probe member 18 and the inner probe member 17 and the core 13. Are formed as portions to be joined.

  When the plurality of probe members (17, 18) are fixed to each other and the plurality of probe members (17, 18) and the core 13 are fixed, first, the outer probe member of the shaft portion 17a of the inner probe member 17 is used. 18 is inserted. When the shaft portion 17a is inserted into the outer probe member 18 until the shaft portion 17a comes into contact with the outer probe member 18 at the flange-shaped portion 17, the tip protrusion 17c is screwed into the female screw hole 13a of the core 13. The inner probe member 17 and the core 13 are screwed together.

  In the above state, the inner probe member 17 and the outer probe member 18 are welded to form the first welded portion 19, and the inner probe member 17 and the outer probe member 18 are fixed to each other. Then, the inner probe member 17 and the core 13 are welded to form the second welded portion 21, and the inner probe member 17 and the core 13 are fixed to each other by welding. Further, the outer probe member 18 and the core 13 are welded to form the second welded portion 20, and the outer probe member 18 and the core 13 are fixed to each other by welding.

  As described above, the inner probe member 17 and the core 13 are fixed by screw connection and also by welding. The outer probe member 18 and the core 13 are fixed by welding. Furthermore, the inner probe member 17 and the outer probe member 18 are fixed by welding. As a result, the probe 12 and the core 13 include a portion where the plurality of probe members (17, 18) are fixed to each other, and a portion where the plurality of probe members (17, 18) and the core 13 are fixed to each other. Parts fixed by welding (first welded part 19, second welded part (20, 21)) and parts fixed by screw connection (screwed part between tip projection 17c and female screw hole 13a) And are provided.

  The position detection signal output unit 15 shown in FIG. 3 has coils (22, 23) that are held by a case 14 (to be described later) and in which the core 13 can be displaced, and outputs a position detection signal of the piston 104. It is provided as a circuit. And as said coil, the position detection signal output part 15 has the primary coil 22 and the secondary coil 23 (23a, 23b) arrange | positioned so that it may couple | bond with the core 13 magnetically. The primary coil 22 is provided as a primary coil that is excited by applying an alternating input voltage. The secondary coil 23 is provided as a secondary coil that generates an induced voltage when the core 13 is displaced in a state where the primary coil 22 is excited.

  FIG. 6 is a diagram schematically illustrating a positional relationship between the primary coil 22 and the secondary coil 23 of the position detection signal output unit 15, the probe 12, and the core 13. As shown in FIGS. 3 and 6, the primary coil 22 is held by the case 14 at a substantially central portion of the case 14 in a direction parallel to the axial direction of the probe 12. The primary coil 22 is configured as a coil spirally wound in the circumferential direction on the core 13 and the probe 12 on the outer side in the radial direction, and both ends are connected to the AC power source 24.

  As shown in FIGS. 3 and 6, the secondary coil 23 includes a secondary coil 23a and a secondary coil 23b. The secondary coil 23 a and the secondary coil 23 b are held by the case 14 on both sides of the primary coil 22 in a direction parallel to the axial direction of the probe 12. The secondary coil 23 a is disposed on the opposite side of the piston fixing portion 17 b in the direction parallel to the axial direction of the probe 12 with respect to the primary coil 22. On the other hand, the secondary coil 23 b is disposed on the piston fixing portion 17 b side in the direction parallel to the axial direction of the probe 12 with respect to the primary coil 22.

  The secondary coil 23a and the secondary coil 23b are configured as coils that are spirally wound in the same direction in the circumferential direction on the outer side of the core 13 and the probe 12 in the radial direction. In the secondary coil 23 a and the secondary coil 23 b, one end of the secondary coil 23 a that is an end portion disposed on the piston fixing portion 17 b side in a direction parallel to the axial direction of the probe 12 and parallel to the axial direction of the probe 12. In one direction, one end of the secondary coil 23b, which is an end portion disposed on the piston fixing portion 17b side, is connected. As a result, the secondary coil 23a and the secondary coil 23b are configured such that the phase of the induced voltage generated when the core 13 is displaced in a predetermined direction with the primary coil 22 excited is opposite in phase. ing.

  Further, the other end of the secondary coil 23a (the end of the secondary coil 23a indicated by a point A1 in FIG. 6), which is the end disposed on the side opposite to the piston fixing portion 17b in the direction parallel to the axial direction of the probe 12. ) And the other end of the secondary coil 23b (the end of the secondary coil 23b indicated by a point A2 in FIG. 6) which is the end disposed on the side opposite to the piston fixing portion 17b in the direction parallel to the axial direction of the probe 12. The voltage difference between the second coil 23 and the second coil 23 is output as a voltage signal based on the induced voltage generated in the secondary coil 23 (23a, 23b). Since this voltage signal is output in proportion to the displacement of the core 13, the voltage signal is output as a position detection signal for the piston 104 proportional to the position of the piston 104 to which the probe 12 to which the core 13 is fixed is further fixed. Will be.

  7 and 8 are diagrams schematically showing the positional relationship between the primary coil 22 and the secondary coil 23, the probe 12, and the core 13, as in FIG. FIG. 6 is a schematic view showing a state in which the core 13 is located at a central position that is equidistant from the secondary coil 23 a and the secondary coil 23 b inside the primary coil 22. FIG. 7 shows that the core 13 moves from the center position to the secondary coil 23 a side in the direction parallel to the axial direction of the probe 12 as the piston 104 is displaced when the rod 102 is displaced toward the cylinder 103. It is a schematic diagram of the state displaced toward. FIG. 8 shows that the core 13 moves from the center position to the secondary coil 23a in the direction parallel to the axial direction of the probe 12 in accordance with the displacement of the piston 104 when the rod 102 is displaced in the direction protruding from the cylinder 103. It is a schematic diagram of the state displaced toward the side.

  When the core 13 is in the center position shown in FIG. 6, the degree of magnetic coupling between the primary coil 22 and the secondary coil 23a is equal to the degree of magnetic coupling between the primary coil 22 and the secondary coil 23b. The AC voltage induced in the secondary coil 23a is equal to the AC voltage induced in the secondary coil 23b. For this reason, the voltage difference between the other end of the secondary coil 23a shown by the point A1 and the other end of the secondary coil 23b shown by the point A2 becomes zero, and the output from the secondary coil 23 becomes zero. For example, the dimensions of the probe 12 are set so that the core 13 is positioned at the center position in a predetermined state where the control surface 101 is in the neutral position and the piston 104 is positioned at the intermediate position of the entire stroke. Thus, when the output from the secondary coil 23 is zero, a position detection signal that detects that the piston 104 is located at a predetermined intermediate position is output from the position detection signal output unit 15. .

  As shown in FIG. 7, when the core 13 is displaced toward the secondary coil 23a, the magnetic coupling degree between the primary coil 22 and the secondary coil 23a is the magnetic coupling degree between the primary coil 22 and the secondary coil 23b. Thus, a difference is generated between the AC voltage induced in the secondary coil 23a and the AC voltage induced in the secondary coil 23b. For this reason, an alternating voltage proportional to the difference is generated between the other end of the secondary coil 23a indicated by the point A1 and the other end of the secondary coil 23b indicated by the point A2, and is output from the secondary coil 23. As a result, a voltage signal proportional to the amount of displacement of the core 13 from the center position toward the secondary coil 23a is output from the secondary coil 23, and the position at which the displacement amount of the piston 104 from the predetermined intermediate position is detected. A detection signal is output from the position detection signal output unit 15.

  On the other hand, when the core 13 is displaced toward the secondary coil 23b as shown in FIG. 8, the magnetic coupling degree between the primary coil 22 and the secondary coil 23b is the magnetic coupling between the primary coil 22 and the secondary coil 23a. It becomes stronger than the degree of coupling, and a difference occurs between the AC voltage induced in the secondary coil 23b and the AC voltage induced in the secondary coil 23a. For this reason, an alternating voltage proportional to the difference is generated between the other end of the secondary coil 23a indicated by the point A1 and the other end of the secondary coil 23b indicated by the point A2, and is output from the secondary coil 23. As a result, a voltage signal proportional to the amount of displacement of the core 13 displaced from the center position toward the secondary coil 23b is output from the secondary coil 23, and the position where the displacement amount of the piston 104 from the predetermined intermediate position is detected. A detection signal is output from the position detection signal output unit 15.

  Note that the phase of the voltage output from the secondary coil 23 is reversed between the state in which the core 13 is displaced toward the secondary coil 23a and the state in which the core 13 is displaced toward the secondary coil 23b. Based on this, the position detection signal output unit 15 detects the displacement on the secondary coil 23 a side and the displacement on the secondary coil 23 b side from the center position of the core 13 as a displacement in which the positive and negative are opposite, and the position detection signal of the piston 104. Is configured to output. Further, the position detection signal of the piston 104 output from the position detection signal output unit 15 (the signal indicated by the symbol S <b> 3 in FIG. 1) is input to the flight controller 110. The flight controller 110 controls the rudder so that the position of the control surface 100 becomes a target position corresponding to the flight state of the aircraft based on the position detection signal from the position detection signal output unit 15 of the actuator position detector 1. It is configured to perform feedback control of the position of the surface 100.

  The case 14 shown in FIG. 3 is configured as a cylindrical structure body that is fixed to the first cylinder member 103 a of the cylinder 103 together with the housing 11, and the core 13 supported on the distal end side of the probe 12 is disposed inside. . As described above, the case 14 is configured to hold the primary coil 22 and the secondary coil 23 (23a, 23b). The case 14 has a plurality of case members (25, 26) arranged concentrically and fixed to each other.

  In the case 14, as a plurality of case members (25, 26), an inner case member 25 formed in a cylindrical shape, and an outer case member 26 formed in a cylindrical shape and disposed outside the inner case member 25. Is provided. The inner case member 25 and the outer case member 26 are made of, for example, SUS300 series stainless steel. Further, the primary coil 22 and the secondary coil 23 (23a, 23b) are held between the inner case member 25 and the outer case member 26.

  The inner case member 25 is provided as a cylindrical member formed such that a bottom portion is provided on one end side and the other end side is opened. The core 13 supported on the distal end side of the probe 12 is inserted and disposed inside the inner case member 25 from the opening on the other end side of the inner case member 25. Further, on the outer periphery of the inner case member 25, from the bottom part side on one end side to the opening side on the other end side along the longitudinal direction of the inner case member 25 arranged in a direction parallel to the axial direction of the probe 12, The secondary coil 23a, the primary coil 22, and the secondary coil 23b are arranged in this order.

  The outer case member 26 disposed outside the inner case member 25 is disposed concentrically with the inner case member 25. That is, the outer case member 26 is disposed with respect to the inner case member 25 in a state where the center line direction of the cylindrical outer case member 26 and the center line direction of the cylindrical inner case member 25 coincide with each other.

  In the present embodiment, the outer case member 26 is provided as a cylindrical member having a two-layer structure. As a member further constituting the outer case member 26, the outer case member 26 is provided on the inner side with the first outer case member 26a disposed on the outer side. The arranged second outer case member 26b is provided. The first outer case member 26a and the second outer case member 26b are both formed in a cylindrical shape. The second outer case member 26b is inserted inside the first outer case member 26a, and the outer peripheral surface of the second outer case member 26b is supported on the inner peripheral surface of the first outer case member 26a. The outer case member 26a and the second outer case member 26b are fixed. Further, the second outer case member 26 b is disposed so that the inner peripheral surface thereof supports the outer peripheral surfaces of the primary coil 22 and the secondary coil 23.

  In the case 14, the inner case member 25 and the first outer case member 26a are fixed to each other by, for example, welding by brazing, electron beam welding, or laser beam welding using a YAG laser or the like. The first outer case member 26a and the second outer case member 26b are also fixed to each other by, for example, welding by brazing, electron beam welding, or laser beam welding using a YAG laser or the like.

  As described above, according to the actuator position detector 1, the core 13 is displaced while the primary coil 22 is excited, whereby an induced voltage is generated in the secondary coil 23, and the position of the piston 104 with respect to the cylinder 103 is determined. Will be detected. A signal based on the induced voltage generated in the secondary coil 23 is output to the flight controller 110 as a position detection signal of the piston 104.

  Further, according to the actuator position detector 1, the probe 12 that supports the core 13 that is displaced inside the coils (22, 23) and that is displaced together with the piston 104 and the rod 102 has a plurality of probe members (17) fixed to each other. 18), and the plurality of probe members (17, 18) are fixed to the core 13, respectively. For this reason, the probes 12 are multiplexed, and even if any of the plurality of probe parts (17, 18) is damaged, the core 13 is kept in a normal state by another probe member. Supported. Further, it is possible to prevent the position of the piston 104 from being detected or causing erroneous detection. Therefore, reliability is improved by redundancy. Further, the plurality of probe members (17, 18) in the probe 12 are arranged concentrically and fixed to each other. For this reason, the probes 12 can be multiplexed in a space-efficient and very compact structure. In addition, since the probe 12 is multiplexed in a compact manner, the reliability is improved by redundancy, so that it is possible to suppress the increase in size and complexity of the structure and the increase in the number of parts and the cost. be able to.

  Therefore, according to the present embodiment, it is possible to improve the reliability by redundancy, suppress the increase in size and complexity of the structure, and also suppress the increase in the number of parts and the cost. A vessel 1 can be provided.

  Further, according to the actuator position detector 1, the first welded portion 19 where the probe members (17, 18) are fixed by welding and the probe members (17, 18) and the core 13 are fixed by welding. Since the second welded portions (20, 21) are provided as different welded portions, welding conditions suitable for welding the probe members (17, 18), the probe members (17, 18), and the core 13 are used. It is possible to individually set welding conditions suitable for welding.

  Further, according to the actuator position detector 1, the probe members (17, 18) are fixed to each other and the portions to which the probe members (17, 18) and the core 13 are fixed by welding. Since the portion to be fixed and the portion to be fixed by screw connection are provided, the fixing means can be set redundantly for welding and screw connection. As a result, the reliability can be improved by further redundancy.

  Further, according to the actuator position detector 1, the cylindrical outer probe member 18 is concentrically arranged outside the shaft-like inner probe member 17, and the probe 12 is duplexed with a compact structure. The inner probe member 17 and the outer probe member 18, the outer probe member 18 and the core 13 are fixed by welding, and the inner probe member 17 and the core 13 are fixed by welding and screw connection. Therefore, the fixing means can be efficiently made redundant.

  Further, according to the actuator position detector 1, the case 14 that holds the coils (22, 23) and is fixed to the cylinder 103 has a plurality of case members (25, 26) fixed to each other. The case 14 is multiplexed. For this reason, even if damage occurs in any of the plurality of case members (25, 26), the coils (22, 23) are held in a normal state by the other case members. Further, it is possible to prevent the position of the piston 104 from being detected or causing erroneous detection. Therefore, reliability is improved by redundancy. Further, the plurality of case members (25, 26) in the case 14 are arranged concentrically and fixed to each other. For this reason, the case 14 can be multiplexed with a space-efficient and very compact structure.

  Further, according to the actuator position detector 1, the cylindrical outer case member 26 is concentrically disposed outside the cylindrical inner case member 25, and the case 14 is duplicated with a compact structure. Further, since the primary coil 22 and the secondary coil 23 are held between the inner case member 25 and the outer case member 26, the coils (22, 23) are arranged in a space efficient manner in the case 14 that has been duplicated. Will be.

  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, you may implement the following modifications.

(1) In the above-described embodiment, the control surface has been described as an example of aircraft equipment, but this need not be the case. An aircraft device driven by an actuator using an actuator position detector may be a device other than the control surface, for example, a landing gear (landing device) in an aircraft (supporting the aircraft body on the ground) Mechanism).

(2) In the above-described embodiment, an example in which the actuator position detector is installed inside the actuator has been described as an example, but this need not be the case. The actuator position detector may be installed with respect to the actuator outside the actuator.

(3) In the above-described embodiment, an example of the form of the actuator position detector that detects the position of the piston by fixing the probe to the piston has been described as an example, but this need not be the case. An actuator position detector may be implemented in which the probe is fixed to the rod and detects the position of the rod.

(4) In the above-described embodiment, an example in which two probe members, that is, an inner probe member and an outer probe member, are provided as a plurality of probe members has been described. However, this need not be the case. An actuator position detector provided with a probe provided with three or more probe members as a plurality of probe members may be implemented. The plurality of probe members may be arranged concentrically and fixed to each other, and may be implemented with various modifications without being limited to the shape exemplified in the above-described embodiment.

(5) In the above-described embodiment, the case in which a plurality of case members are provided in the case has been described as an example. However, this need not be the case, and an actuator provided with a case having only one case member is provided. A position detector may be implemented. Further, when a plurality of case members are provided in the case, the shape and number of the case members may be variously changed without being limited to the form exemplified in the above-described embodiment.

(6) The fixing form between the plurality of probe members and the fixing form of the plurality of probe members and the core are not limited to the form illustrated in the above-described embodiment, and may be implemented with various changes. For example, you may implement the modification shown in FIG. FIG. 9 is a cross-sectional view showing a probe and a core in an actuator position detector according to a modification. The probe 12 and the core 13 shown in FIG. 9 are configured in the same manner as the probe 12 and the core 13 in the above-described embodiment, but the fixed form of the plurality of probe members (17, 18) and the plurality of probe members ( 17 and 18) and the fixed form of the core 13 are different from the above-described embodiment. In addition, about the element comprised like the above-mentioned embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in FIG.

  In the modified example shown in FIG. 9, a groove 17 e formed in a notch shape is provided at the root portion of the tip protrusion 17 c of the inner probe member 17. The welded portion 27 is formed by welding through the groove 17e, and the inner probe member 17, the outer probe member 18, and the core 13 are joined and fixed by the welded portion 27. That is, in the actuator position detector according to this modification, a plurality of probe members (17, 18) are fixed to each other by welding, a plurality of probe members (17, 18), and a core 13; And a welded portion to which is fixed by welding are provided as an integral welded portion 27.

  According to this modification, the welded portions of the probe members (17, 18) and the welded portions of the probe members (17, 18) and the core 13 are provided as an integral welded portion 27. (17, 18) and the fixing work by welding the core 13 can be performed efficiently.

  The present invention is used as an actuator for driving an aircraft device by operating when a piston provided on a rod is displaced in the cylinder, and as a position detector for an actuator for detecting the position of the piston or the rod with respect to the cylinder, It can be widely applied.

DESCRIPTION OF SYMBOLS 1 Actuator position detector 12 Probe 13 Core 14 Case 15 Position detection signal output part 17 Inner probe member 18 Outer probe member 22 Primary coil 23, 23a, 23b Secondary coil

Claims (7)

A position detector for an actuator for detecting a position of a piston or a rod relative to a cylinder, which is used for an actuator that operates when a piston provided on a rod is displaced in a cylinder to drive an aircraft device,
A probe fixed to the piston or the rod and displaced together with the piston and the rod;
A core which is a movable iron core fixed to the probe and displaced together with the probe;
A case that is fixed to the cylinder and the core is disposed inside;
A position detection signal output unit that has a coil that is held by the case and in which the core is displaceably disposed, and that outputs a position detection signal of the piston or the rod;
With
The position detection signal output unit includes a primary coil that is provided as a primary coil that is excited when an input voltage is applied thereto, and an induced voltage that is generated when the core is displaced while the primary coil is excited. A secondary coil provided as a secondary-side coil in which is generated, and outputs a signal based on the induced voltage generated in the secondary coil as the position detection signal,
The probe has a plurality of probe members arranged concentrically and fixed to each other,
The actuator position detector, wherein the plurality of probe members are respectively fixed to the core. The actuator position detector according to claim 1,
A first welded portion provided as a portion where the plurality of probe members are fixed to each other by welding, and a second welded portion provided as a portion where the plurality of probe members and the core are fixed to each other by welding Are provided as different welded parts, a position detector for actuators. The actuator position detector according to claim 1 or 2,
A portion where the plurality of probe members are fixed to each other, a portion where the plurality of the probe members and the core are fixed to each other, a portion fixed by welding and a portion fixed by screw coupling are provided An actuator position detector. The actuator position detector according to claim 3,
As the plurality of probe members, an inner probe member formed in a shaft shape, and an outer probe member formed in a cylindrical shape and disposed outside the inner probe member and disposed concentrically with the inner probe member; Is provided with
The inner probe member and the core are fixed by screw connection and also fixed by welding,
The outer probe member and the core are fixed by welding,
The actuator position detector, wherein the inner probe member and the outer probe member are fixed by welding. The actuator position detector according to claim 1,
A welded portion in which each of the plurality of probe members is fixed to each other by welding and a welded portion in which the plurality of probe members and the core are fixed by welding are provided as an integral welded portion. An actuator position detector. The actuator position detector according to any one of claims 1 to 5,
The position detector for an actuator, wherein the case has a plurality of case members arranged concentrically and fixed to each other. The actuator position detector according to claim 6,
As the plurality of case members, an inner case member formed in a cylindrical shape, and an outer case member formed in a cylindrical shape and disposed outside the inner case member and concentrically with the inner case member, Is provided with
The actuator position detector, wherein the primary coil and the secondary coil are held between the inner case member and the outer case member.

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