JP3179954U - Horizontal tail drive - Google Patents

Abstract

A horizontal tail drive device is provided that can immediately detect that a main drive shaft has been damaged.
A cylindrical main drive shaft having a ball screw formed on the outer periphery and a sub drive shaft inserted into the main drive shaft. The secondary drive shaft is coupled by a spline at one end of the primary drive shaft, and a ring coupled by the secondary drive shaft and the spline is installed on the drive force input side of the primary drive shaft at the other end. Consists of balls fitted in conical concave holes provided on the opposing surfaces of the main drive shaft and the ring, and when the main drive shaft is damaged, the ring is displaced in the axial direction by the rotational movement of the main drive shaft A displacement mechanism and a detector for detecting the axial displacement of the ring are provided.
[Selection] Figure 1

Description

  The present invention relates to a failure stop mechanism for a horizontal tail drive device used in an aircraft control system.

  FIG. 9 shows a longitudinal section of the structure of a conventional horizontal tail drive device during normal operation. The horizontal tail drive device 51 includes a main drive shaft 52 having a ball screw formed on the outer periphery, a nut 54 screwed to the main drive shaft 52 via a ball 69, and splines on both ends of the inner surface. The auxiliary drive shaft 53 is connected to the main drive shaft 52 through 60 and 61, and the body 55 holds the main drive shaft 52 through radial bearings 56 and 57 and a thrust bearing 58.

  The main drive shaft 52 includes a gear portion 52a for transmitting a rotational force from a drive source such as a hydraulic motor provided in the horizontal tail device. Further, a retainer 59 is provided to constrain the relative position of the main drive shaft 52 and the sub drive shaft 53 in the axial direction.

  The operation of the horizontal tail drive device 51 will be described. The rotational force transmitted to the gear portion 52 a is transmitted to the main drive shaft 52 and converted into a linear force of the nut 54 screwed onto the main drive shaft 52 via the ball 69. At that time, the sub drive shaft 53 coupled to the main drive shaft 52 via the splines 60 and 61 rotates together.

  Next, the mounting state of the horizontal tail drive device 51 will be described. FIG. 10 shows an outline of the configuration when a conventional horizontal tail drive device is used as an aircraft tail drive device. In the tail control system, the body 55 of the horizontal tail drive device 51 is held by a hinge 35 on a hinge block 33 fixed to the body structure 31 via a joint 37, and the nut 54 of the horizontal tail drive device 51 is hinged. The rotation is restrained by 36 and is held by the tail wing 32, and the tail wing 32 is held rotatably about the hinge 34 of the airframe structure 31.

  The tail blade 32 is driven by converting the rotational force applied to the main drive shaft 52 into a linear force of the nut 54 and changing it into a rotational force around the hinge 34 via an interlocking mechanism to control the tail blade.

  Aircraft control system components and systems are required to have higher reliability and flight safety. Therefore, the aircraft control system is designed to incorporate a double or triple backup function / mechanism that works on the safe side so that even if a component device or part of the system fails, the failure will not be a serious obstacle to flight safety. Has been made. In the horizontal tail drive device 51, the auxiliary drive shaft 53 is one of the backup functions and mechanisms.

  FIG. 11 shows a longitudinal section of the structure of the backup mechanism when the main drive shaft of the conventional horizontal tail drive device is broken. FIG. 11 shows a state in which the main drive shaft 52 holding the normal nut 54 is broken (shown in the broken portion diagram) and separated into the main drive shaft upper portion 52b and the main drive shaft lower portion 52c. . The rotational force input to the main drive shaft lower portion 52c that is broken and separated is transmitted to the sub drive shaft 53 via the spline 61, and further transmitted to the main drive shaft upper portion 52b via the spline 60, and the main drive shaft upper portion 52c. It is transmitted as a linear force to the nut 54 screwed to the ball 52b via the ball 69, and the drive of the tail is continued.

  Patent Document 1 discloses a restraint mechanism that mechanically couples the main drive shaft and the sub drive shaft after detecting breakage of the main drive shaft.

JP 2007-76573 A

  Even if a major failure occurs that mechanically damages the main drive shaft that transmits the steering force in the horizontal tail drive device, it is possible to continue driving through the secondary drive shaft, so that the failure is not discovered and at the time of breakage. There is a danger that the drive by the secondary drive shaft without the backup mechanism will continue, resulting in a fatal failure. In order to avoid the fatal obstacles, increasing the durability of the secondary drive shaft to the same level or more as the main shaft device increases the horizontal tail drive device itself, and significantly increases the production cost, running cost, weight and occupied space. Disadvantageous.

In order to solve the above problems, the present invention provides a cylindrical main drive shaft having a ball screw formed on the outer periphery thereof, a nut that is screwed to the main drive shaft via a ball, and is inserted into the main drive shaft. And a sub-drive shaft that rotates integrally with the main drive shaft, and the nut moves linearly by the rotation of the main drive shaft to drive the horizontal tail of the aircraft.
The sub drive shaft is connected by a spline at one end of the main drive shaft, and connected to the main drive shaft at the drive force input side of the other end of the main drive shaft so as to be able to transmit torque, and by the sub drive shaft and the spline. When the main drive shaft is damaged between the coupled ring and the drive force input side of the main drive shaft and the drive force output side where the nut is present, the ring is rotated by the rotation of the main drive shaft. A displacement mechanism for displacing in the direction and a detector for detecting the axial displacement of the ring, and detecting that the main drive shaft is broken by the output of the detector.

  According to the present invention, the displacement mechanism has a convex portion on the bottom surface of the main drive shaft and a concave portion on the top surface of the ring, and a member that engages with each other, and surfaces of the convex portion and the concave portion facing each other It is desirable to be composed of a ball fitted in a conical recess provided in the.

  Further, according to the present invention, the displacement mechanism has a convex portion on the bottom surface of the main drive shaft and a concave portion on the top surface of the ring, and a member to be engaged with the convex portion and the concave portion are opposed to each other. The V-shaped ridge and the V-shaped groove provided on the surface to be fitted may be fitted to each other.

  By providing a detector that detects the state of breakage of the main drive shaft, it is possible to immediately know the occurrence of breakage, so that appropriate measures can be taken and maneuvering can be continued. In addition, since appropriate measures can be taken immediately, it is not necessary to give the secondary drive shaft excessive strength and durability.

The longitudinal section of the structure at the time of normal operation of the horizontal tail drive device in the present invention is shown. The top view (AA cross section) of the structure at the time of normal operation of the horizontal tail drive device in the present invention is shown in (a), and the arrow C is shown in (b). The longitudinal cross-section of the structure at the time of the main drive shaft fracture | rupture of the horizontal tail drive device in this invention is shown. The top view (BB cross section) of the structure of the horizontal tail drive device of the present invention when the main drive shaft is broken is shown in (a), and the arrow D is shown in (b). The longitudinal section of the structure at the time of normal operation of the modification of the horizontal tail drive device in the present invention is shown. The top view (EE cross section) of the structure of the modification of the horizontal tail drive device of the present invention during normal operation is shown in (a), and the arrow G is shown in (b). The longitudinal cross-section of the structure at the time of the main drive shaft fracture | rupture of the modification of the horizontal tail drive device in this invention is shown. The top view (FF cross section) of the structure at the time of the main drive shaft fracture | rupture of the modification of the horizontal tail drive device in this invention is shown to (a), and H arrow view is shown to (b). The longitudinal section of the structure at the time of normal operation of the conventional horizontal tail drive device is shown. An outline of a configuration when a conventional horizontal tail drive device is used as an aircraft tail drive device will be described. The longitudinal section of the structure of the backup mechanism at the time of the main drive shaft fracture | rupture of the conventional horizontal tail drive device is shown.

  FIG. 1 shows a longitudinal section of the structure of the horizontal tail drive device according to the present invention during normal operation. FIG. 2 shows a top view (A-A cross-sectional view) of the structure of the horizontal tail drive device according to the present invention during normal operation, and FIG.

  The horizontal tail drive device 1 includes a main drive shaft 2 having a ball screw formed on the outer periphery, a nut 4 screwed onto the main drive shaft 2 via a ball 19, and a spline at the upper end of the inner surface that is inserted into the main drive shaft 2. A sub-drive shaft 3 coupled to the main drive shaft 2 via 10 and a body 5 that holds the main drive shaft 2 via radial bearings 6 and 7 and a thrust bearing 8.

  The main drive shaft 2 includes a gear portion 2a for transmitting a rotational force from a drive source such as a hydraulic motor provided in the horizontal tail device, and is detached to constrain the axial position with the sub drive shaft 3. A stop 9 is provided. A ring 15 coupled to the sub drive shaft 3 via the spline 11 is disposed below the main drive shaft 2.

  The main drive shaft 2 and the ring 15 that face each other have the balls 16 accurately engage with the corresponding three pairs of conical concave holes 17 and 18 provided on the facing surfaces, and the ring 15 is connected to the main drive shaft 2 by the spring 12. By energizing in this direction, the phase relationship between the ring 15 and the main drive shaft 2 is maintained. Therefore, the ring 15 and the main drive shaft 2 rotate together. The spring 12 is attached to the body 5 via a thrust bearing 13 and rotates integrally with the ring 15. Further, the number of balls 16 is not limited to three, and may be three or more.

  The opposing surfaces of the main drive shaft 2 and the ring 15 have irregular portions, and the convex portions 2d of the main drive shaft 2 are arranged in a state of fitting with each other in the concave portions 15d of the ring 15. The width of the concave portion 15d is larger than the width of the convex portion 2d by a predetermined amount. The body 5 is provided with a detector 14 that detects the approach of the end 15b of the ring 15 when the ring 15 moves downward in the axial direction.

  The operation of the horizontal tail drive device 1 will be described. The rotational force transmitted to the gear portion 2 a is transmitted to the main drive shaft 2 and converted into a linear force of the nut 4 screwed to the main drive shaft 2 via the ball 19. At that time, the rotation is transmitted from the main drive shaft 2 to the sub drive shaft 3 through the spline 10, and at the same time, the rotation of the main drive shaft 2 is transmitted to the ring 15 through the ball 16 and further through the spline 11. It is transmitted to the auxiliary drive shaft 3.

  FIG. 3 shows a longitudinal section of the structure of the horizontal tail drive device of the present invention when the main drive shaft is broken. 4A is a top view (BB cross-sectional view) of the structure of the horizontal tail drive device of the present invention when the main drive shaft is broken, and FIG.

  FIG. 3 shows a state in which the main drive shaft 2 is broken (shown in the broken portion diagram) and separated into the main drive shaft upper portion 2b and the main drive shaft lower portion 2c. During normal operation, the driving force is input from the gear portion 2a and output to the outside through the nut 4 screwed to the main drive shaft 2. Accordingly, a torsional torque acts between the input / output portions of the main drive shaft 2, and the breakage occurs between the gear portion 2a and the nut 4. When the breakage occurs, the nut 4 exists on the upper portion 2b of the main drive shaft.

  The rotational force input to the main drive shaft lower portion 2c that has been broken and separated is transmitted via a route different from that in the normal state. In the process of increasing the transmission torque to drive the tail, when the torque exceeds a certain value, the main drive shaft lower portion 2c moves in the circumferential direction relative to the ring 15, and at that time, the spring 12 The ball 16 fitted into the conical concave holes 17 and 18 provided in the main drive shaft 2 and the ring 15 rides on the conical concave holes 17 and 18. (See Fig. 4 (b))

  When the circumferential movement of the main drive shaft lower portion 2c further proceeds, the convex portion 2d of the main drive shaft lower portion 2c comes into contact with the side surface of the concave portion 15d of the ring 15 as shown in FIG. The rotational force is transmitted to the ring 15. The rotational force transmitted to the ring 15 is transmitted to the auxiliary drive shaft 3 via the spline 11 and further transmitted to the main drive shaft upper portion 2b via the spline 10. Further, the rotational force is transmitted to the nut 4 screwed into the main drive shaft upper part 2b via the ball 19, and the steering function is maintained.

  The broken main drive shaft upper portion 2b is retained by the retaining member 9 in the axial positional relationship with the sub drive shaft 3. At this time, as shown in FIG. 4 (b), the ring 15 is displaced in the direction in which the spring 12 is pressed and contracted, and the ring 15 is displaced by a predetermined amount corresponding to the amount of the ball 16 riding on the conical concave holes 17 and 18. The state is detected and recognized by the detector 14 as “breakage of the main drive shaft 2”. The detector 14 for detecting the approach of the end 15b of the ring 15 is not particularly limited, but an optical, magnetic or electrostatic proximity switch or a contact limit switch is used.

  FIG. 5 shows a longitudinal section of the structure of a modified example of the horizontal tail drive device according to the present invention during normal operation. FIG. 6A shows a top view (EE cross-sectional view) of the structure of a modified example of the horizontal tail drive device according to the present invention during normal operation, and FIG.

  The horizontal tail drive device 21 includes a main drive shaft 22 having a ball screw formed on the outer periphery, a nut 24 screwed to the main drive shaft 22 via a ball 49, and a spline at the upper end of the inner surface that is inserted into the main drive shaft 22. The auxiliary drive shaft 23 is coupled to the main drive shaft 22 via 40, and the body 25 holds the main drive shaft 22 via radial bearings 26 and 27 and a thrust bearing 28.

  The main drive shaft 22 includes a gear portion 22a for transmitting a rotational force input from the outside, and a retaining member 29 for restricting the axial position with the sub drive shaft 23. A ring 45 coupled to the sub drive shaft 23 via the spline 41 is disposed below the main drive shaft 22.

  The main drive shaft 22 and the ring 45 facing each other are fitted with three pairs of V-shaped ridges 38 and V-shaped grooves 39 provided on the facing surfaces, and the ring 45 is biased by the spring 42 toward the main drive shaft 22. By doing so, the phase relationship between the ring 45 and the main drive shaft 22 is maintained. Therefore, the ring 45 and the main drive shaft 22 rotate together. The spring 42 is attached to the body 25 via a thrust bearing 43 and rotates integrally with the ring 45. Further, the V-shaped ridges 38 and the V-shaped grooves 39 are not limited to three locations, and may be three or more locations.

  The opposing surfaces of the main drive shaft 22 and the ring 45 have irregular portions, and the convex portions 22d of the main drive shaft 22 are arranged in a state of being engaged with the concave portions 45d of the ring 45. The width of the recess 45d is larger than the width of the protrusion 22d by a predetermined amount. The body 25 is provided with a detector 44 that detects the approach of the end 45b of the ring 45 when the ring 45 moves downward in the axial direction.

  The operation of the horizontal tail drive device 21 will be described. The rotational force transmitted to the gear portion 22 a is transmitted to the main drive shaft 22 and converted into a linear force of the nut 24 screwed to the main drive shaft 22 via a ball 49. At this time, the rotation is transmitted from the main drive shaft 22 to the sub drive shaft 23 through the spline 40, and at the same time, the rotation of the main drive shaft 22 through the V-shaped ridge 38 and the V-shaped groove 39 fitted to each other is rotated by the ring 45 To the auxiliary drive shaft 23 via the spline 41.

  FIG. 7 shows a longitudinal section of the structure of the modification of the horizontal tail drive device of the present invention when the main drive shaft is broken. FIG. 8A is a top view (FF cross-sectional view) of the structure of the modification of the horizontal tail drive device of the present invention when the main drive shaft is broken, and FIG.

  FIG. 7 shows a state in which the main drive shaft 22 is broken (shown in the broken portion diagram) and separated into the main drive shaft upper portion 22b and the main drive shaft lower portion 22c. During normal operation, the driving force is input from the gear portion 22a and output to the outside through the nut 24 screwed to the main drive shaft 22. Accordingly, a torsional torque acts between the input / output portions of the main drive shaft 22, and the breakage occurs between the gear portion 22a and the nut 24. When the breakage occurs, the nut 24 exists on the main drive shaft upper portion 22b.

  The rotational force input to the main drive shaft lower portion 22c that is broken and separated is transmitted via a route different from that in the normal state. In the process of increasing the transmission torque for driving the tail, when the torque exceeds a certain value, the main drive shaft lower portion 22c moves in the circumferential direction relative to the ring 45, and at that time, the spring 42 The V-shaped mountain 38 provided on the main drive shaft 22 rides on the V-shaped groove 39 provided on the ring 45 while pushing and shrinking. (See FIG. 8 (b))

  As the main drive shaft lower portion 22c further moves in the circumferential direction, the convex portion 22d of the main drive shaft lower portion 22c comes into contact with the side surface of the concave portion 45d of the ring 45 as shown in FIG. The rotational force is transmitted to the ring 45. The rotational force transmitted to the ring 45 is transmitted to the sub drive shaft 23 via the spline 41 and further transmitted to the main drive shaft upper portion 22b via the spline 40. Further, the rotational force is transmitted to the nut 24 screwed to the main drive shaft upper part 22b via the ball 49, and the steering function is maintained.

  The broken main drive shaft upper portion 22 b is held in the axial position relationship with the sub drive shaft 23 by a retaining 29. At this time, as shown in FIG. 8B, the ring 45 is displaced in a direction in which the spring 42 is pressed and contracted, and the ring 45 is displaced by a predetermined amount corresponding to the amount of the V-shaped mountain 38 riding on the V-shaped groove 39. This state is detected and recognized by the detector 44 as “breakage of the main drive shaft 22”. The detector 44 for detecting the approach of the end 45b of the ring 45 is not particularly limited, but an optical, magnetic or electrostatic proximity switch or a contact limit switch is used.

  In FIG. 1 to FIG. 11, the same reference numerals represent the same items and have the same functions.

1, 21, 51 Horizontal tail drive device 2, 22, 52 Main drive shafts 2a, 22a, 52a Gear portions 2b, 22b, 52b Main drive shaft upper portions 2c, 22c, 52c Main drive shaft lower portions 2d, 22d Convex portions 3, 23 , 53 Sub drive shaft 4, 24, 54 Nut 5, 25, 55 Body 6, 7, 26, 27, 56, 57 Radial bearing 8, 13, 28, 43, 58 Thrust bearing 9, 29, 59 Retaining stopper 10, 11, 40, 41, 60, 61 Spline 12, 42 Spring 14, 44 Detector 15, 45 Ring 15b, 45b End 15d, 45d Recess 16, 19, 49, 69 Ball 17, 18 Conical recess 31 Machine structure 32 Tail 33 Hinge block 34, 35, 36 Hinge 37 Joint 38 V-shaped mountain 39 V-shaped groove

Claims (3)

A cylindrical main drive shaft having a ball screw formed on the outer periphery, a nut that is screwed to the main drive shaft via a ball, and a sub screw that is inserted into the main drive shaft and rotates integrally with the main drive shaft. In a horizontal tail drive device that has a drive shaft and drives the horizontal tail of an aircraft by causing the nut to linearly move by rotation of the main drive shaft,
The sub drive shaft is connected by a spline at one end of the main drive shaft, and connected to the main drive shaft at the drive force input side of the other end of the main drive shaft so as to be able to transmit torque, and by the sub drive shaft and the spline. When the main drive shaft is damaged between the coupled ring and the drive force input side of the main drive shaft and the drive force output side where the nut is present, the ring is rotated by the rotation of the main drive shaft. A horizontal tail drive device comprising: a displacement mechanism for displacing in a direction; and a detector for detecting an axial displacement of the ring, and detecting that the main drive shaft is broken by the output of the detector.   The displacement mechanism has a convex portion on the bottom surface of the main drive shaft and a concave portion on the top surface of the ring, and is provided on a member that engages with each other, and on the surfaces of the convex portion and the concave portion facing each other. 2. The horizontal tail drive device according to claim 1, wherein the horizontal tail drive device comprises a ball fitted in a conical concave hole. The displacement mechanism has a convex portion on the bottom surface of the main drive shaft and a concave portion on the top surface of the ring, and is provided on a member that engages with each other, and on the surfaces of the convex portion and the concave portion facing each other. 2. The horizontal tail drive device according to claim 1, wherein the V-shaped ridge and the V-shaped groove are fitted to each other.

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