A linkage unlocking mechanism for air rudder and gas rudder based on steel ball lock

Abstract

The application discloses a linkage unlocking mechanism for air rudder and gas rudder based on a steel ball lock, which is designed as a two-stage structure, a driving stage and an output stage share a shell, an output piston is arranged in an output piston cavity on the left side of the shell, a driving piston is arranged in a driving piston cavity on the right side of the shell, the output piston and the driving piston are interlocked in different states by means of a steel ball, and a larger locking force is provided. Meanwhile, one end of the output piston and the driving piston is respectively provided with a spring for keeping the linkage or unlocking state of the mechanism. In addition, after the output piston is unlocked to a position, two reed switches are turned on, and the unlocking state information is transmitted to a system for mechanism state feedback. The application designs a linkage unlocking mechanism in a double-piston form based on the principle of the steel ball lock, adopts a double-redundancy design, needs to be powered for a short time only during state switching, and the linkage and unlocking states are both power-off, so that the working reliability of the linkage and unlocking states under long-time and complex working conditions can be ensured, and repeated testing can be realized.

Description

Technical Field

[0001] This invention relates to the field of aircraft design, and in particular to a linkage unlocking mechanism for air rudder and gas rudder based on a steel ball lock. Background Technology

[0002] During initial launch, the aircraft's speed is low, and the aerodynamic control surfaces have low efficiency. Initial rapid turns are primarily achieved by the gas turbine control surfaces changing the direction of the engine exhaust. To reduce costs and size, the gas turbine control surfaces are generally not designed with separate drive mechanisms. Instead, they are connected to the aerodynamic control surface's drive mechanism via a linkage mechanism, which in turn drives the gas turbine control surfaces to deflect. This requires that the aerodynamic and gas turbine control surfaces work together for a period after launch to control the aircraft's rapid turns. Once the aircraft has completed its turn, the linkage mechanism is released, and the aerodynamic and gas turbine control surfaces move independently. The gas turbine control surfaces remain in a zero-position state under the influence of the exhaust flow, while the aerodynamic control surfaces deflect following the control command signal.

[0003] Traditional air rudder and gas rudder linkage unlocking mechanisms are generally pyrotechnic devices such as pin pullers, which are disposable products, cannot be tested during assembly and adjustment, and are relatively expensive. Another technical solution is an electromagnetic pin puller, which can be repeatedly tested. However, it requires continuous power for a long time to maintain linkage / unlocking states, has a small locking force, and low reliability under complex working conditions. Summary of the Invention

[0004] The technical problem solved by this invention is to improve the reliability and testability of the air rudder and gas rudder linkage unlocking mechanism. It provides an air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock. This mechanism is a reusable, non-pyrotechnic linkage unlocking mechanism that only requires short-term power supply and can maintain a highly reliable linkage and unlocking state in the power-off state. It has a sufficiently large locking force and can be repeatedly tested.

[0005] The technical solution of the present invention is: to provide an air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock, which is designed as a two-stage structure, with the drive stage and the output stage jointly set in a housing. The housing has an output stage piston chamber and a drive stage piston chamber arranged side by side, and a steel ball movement chamber is opened on the wall between the two piston chambers to accommodate the steel ball.

[0006] An output piston is installed inside the output stage piston chamber. A through hole is opened on the shell wall at one end of the chamber for the output piston to enter and exit. A first elastic body is installed between the output piston and the end with the through hole, which generates elastic force along the axial direction of the chamber.

[0007] Electromagnetic coils are installed at both ends of the drive stage piston chamber, and a drive piston is arranged between the two electromagnetic coils. Permanent magnets with opposite magnetic field directions are installed at both ends of the drive piston, forming a redundant drive structure with the two electromagnetic coils. One end attracts and the other end repels. A second elastic body is also installed in the drive stage piston chamber. The installation direction of the second elastic body relative to the drive piston is the same as the direction of the first elastic body relative to the output piston.

[0008] The drive piston moves along the piston chamber of the drive stage under the combined action of electromagnetic forces at both ends and elastic forces of the second elastic body, causing the steel ball to move horizontally in the steel ball movement chamber, controlling the output piston to lock or unlock. The output piston moves under the drive of the elastic forces of the first elastic body, and reaches the unlocked state from the linked state through the unlocking process, realizing the switching between the linked and unlocked states of the air rudder and the gas rudder.

[0009] Furthermore, the linkage unlocking mechanism only requires power during the unlocking process; it is de-energized in both the linkage and unlocking states.

[0010] When the linkage unlocking mechanism is in the linkage state, the drive piston remains stationary in its initial position under the action of the second elastic body. Relying on the cooperation of the steel ball and the drive piston, the output piston is locked, so that the output piston is kept out of the output stage piston chamber, and the air rudder and gas rudder are linked.

[0011] During the unlocking process of the linkage unlocking mechanism, the electromagnetic coils at both ends are energized, driving the piston to move against the force of the second elastic body under the action of the electromagnetic field. After the movement reaches the position, the steel ball limit is released, and the output piston pushes the steel ball to move horizontally under the action of the first elastic body, unlocking the output piston. At the same time, the drive piston is locked, and the output piston moves from the outside to the inside until it is fully inserted into the output stage piston chamber. When the electromagnetic coils at both ends are de-energized, the drive piston pushes the steel ball to move horizontally in the opposite direction under the action of the second elastic body, relocking the output piston. At the same time, the drive piston is unlocked, returning to the initial position, completing the unlocking of the aerodynamic rudder and the gas turbine rudder.

[0012] When the linkage unlocking mechanism is in the unlocked state, the first elastic body and the steel ball, as redundant locking structures in the unlocked state, jointly provide locking force to lock the output piston in the output stage piston chamber, and drive the piston to remain stationary in the initial position under the action of the second elastic body.

[0013] Furthermore, during the unlocking process of the linkage unlocking mechanism, the drive piston reciprocates along the drive stage piston chamber, while the output piston moves unidirectionally along the output stage piston chamber.

[0014] Furthermore, the output piston is a variable-diameter cylindrical structure. The first section is a pin structure with a through hole leading to and exiting the output stage piston chamber, used to control the linkage and unlocking of the air rudder and gas rudder. The second section is the piston body, which cooperates with the output stage piston chamber and moves within the chamber. The outer wall of the piston body is provided with a first annular groove. The third section is a cylindrical section with the same diameter as the first annular groove. The cylindrical section cooperates with a steel ball to lock the output piston in the linkage state. The first annular groove cooperates with the steel ball to lock the output piston in the unlocking state.

[0015] The drive piston is also a variable diameter cylindrical structure with a second annular groove on its outer wall surface, which cooperates with the steel ball to unlock the output piston and lock the drive piston at the same time.

[0016] The diameter changes of both the output piston and the drive piston are achieved using tapered transitions, with smooth transitions at the intersections. This allows the output piston and the drive piston to exert a horizontal thrust on the steel ball as they move within the piston chamber, causing the steel ball to move in a predetermined direction.

[0017] Furthermore, permanent magnet mounting holes and mounting holes are provided at both ends of the drive piston, and two permanent magnets are fixed in the mounting holes and mounting holes.

[0018] Furthermore, a buffer pad is installed on the side of the output stage piston chamber opposite to the opening end, and buffer pads are installed at both ends of the drive stage piston chamber to reduce the impact force on the output piston and drive piston during state switching.

[0019] Furthermore, the buffer pad is made of insulating material, and two separate reed slots are provided inside the buffer pad, with two reeds installed in each slot. When the mechanism is in the linkage state, the two reeds are in an insulating state. After the unlocking process is completed, under the action of the output piston, the reeds deform and retract into the slots, and the output piston contacts the two reeds, making the two reeds conductive. The two reeds transmit signals to the controller through lead wires to provide feedback on the working status of the mechanism.

[0020] Furthermore, in the output stage piston chamber, a buffer pad is fixedly installed in the threaded sleeve hole; in the drive stage piston chamber, an electromagnetic coil and a buffer pad are sequentially fixedly installed in the threaded sleeve hole at one end, and another electromagnetic coil and a buffer pad are sequentially fixedly installed symmetrically in the threaded sleeve hole at the other end.

[0021] Furthermore, through holes are provided between the screw sleeve and the buffer pad for resetting the output piston; through holes are provided between the screw sleeve and the buffer pad for resetting the drive piston.

[0022] The unlocking and linkage states can be manually switched by external tooling, making the linkage unlocking mechanism reusable.

[0023] Furthermore, when the first and second elastic bodies are in an extended state, the forces exerted on the output piston and the drive piston are greater than the inertial forces generated by the output piston and the drive piston under the maximum overload condition of the linkage unlocking mechanism, with sufficient margin. The design margin is set at 1.5 times.

[0024] Furthermore, the electromagnetic coil is powered by a voltage of less than 24V.

[0025] The advantages of this invention compared to the prior art are:

[0026] (1) Compared with the existing technical solutions, the present invention adopts a two-stage structure to realize linkage unlocking control, replacing the traditional pyrotechnic and electromagnetic single-stage linkage unlocking mechanisms. Among them, the driving stage is driven by coil energization to switch the driving control state, and the output stage is based on the steel ball lock principle and elastic element to realize the redundant design of the unlocking state locking structure, realizing reliable locking of the output piston under heavy load conditions. It solves the problems of low locking holding force, long-term energization and inability to repeat testing in the existing technical solutions. It realizes the effect of the driving stage relying on low voltage and small signal drive to obtain high power output locking force in the output stage. Relying on the joint action of steel ball and first elastic body, the locking of output piston under heavy load conditions is realized, effectively improving the working reliability under complex conditions.

[0027] (2) This invention adopts a power-off type linkage unlocking state locking scheme. Both the linkage and unlocking states are kept in a power-off state. During operation, the electromagnetic coil only needs to be briefly energized during state switching to generate a drive signal. This is a mechanical locking structure where both the linkage and unlocking states are in a power-off state. By setting a steel ball and an elastic body to jointly lock the output piston, the working performance of the mechanism under complex working conditions such as long-term operation and vibration impact is improved, avoiding the problems of electromagnetic mechanisms requiring long-term power supply, small locking force, and unreliability.

[0028] (3) The present invention sets up a redundant driving structure with two electromagnetic coils and two permanent magnets. When the state is switched, the two electromagnetic coils are energized at the same time, forming attraction and repulsion with the two permanent magnets respectively, thus achieving the effect of redundant driving force design.

[0029] (4) The present invention adopts a mechanical locking scheme, which replaces the traditional high-pressure gas locking method of pyrotechnic mechanism. While ensuring a large locking force, it solves the problem of reusability and greatly reduces costs. It can be freely reset in both linkage and unlocking states, and can freely switch between linkage and unlocking states to meet the repeated testing requirements during debugging and testing.

[0030] (5) This invention incorporates working status feedback. Two feedback springs are installed in the buffer structure on one side of the output piston. The springs are connected by wires and led out by the mechanism, allowing the working status of the mechanism to be fed into the closed-loop system. The buffer structure for installing the springs is made of insulating material. When the mechanism is in the linked state, the two springs are mutually insulated. When the mechanism is in the unlocked state, the output piston moves to the top of the output piston chamber and simultaneously contacts the two springs. The springs are compressed and deformed and maintain reliable contact with the output piston. At this time, the two springs are connected through the output piston.

[0031] (6) The present invention has designed vibration damping and buffering structures in both the drive stage piston chamber and the output stage piston chamber, and can make matching material selection and design according to the specific working conditions, so as to reduce the impact on the mechanism after the drive piston and the output piston are in place during the state switching process.

[0032] (7) The permanent magnet and driving piston, spring and buffer pad and other fixed connection parts designed in this invention have eliminated the traditional screw or rivet installation form. They all adopt a combination of interference fit and epoxy potting solution. While effectively ensuring the reliability of the connection and fixation of the parts, the system simplifies the design and miniaturizes the design, which is suitable for the extremely tight size space of the bullet. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the linkage state of the mechanism in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the mechanism unlocking process in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the mechanism's unlocked state in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the shell structure in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the driving piston structure in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the buffer pad structure in an embodiment of the present invention. Detailed Implementation

[0039] To better understand the technical solution of the present invention, the embodiments of the present invention will be specifically described below with reference to the accompanying drawings. Parts of each structure in the drawings will be described separately. It is worth noting that elements not shown in the drawings or not described in words are in forms known to those skilled in the art. Any references to directions and orientations in the description of the embodiments herein are for ease of description only and should not be construed as limiting the scope of protection of the present invention. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination. The present invention is not particularly limited to the preferred embodiments.

[0040] The schematic diagram of the linkage unlocking mechanism given in this embodiment can be found in [reference needed]. Figure 1 The design is a two-stage structure, including a drive stage and an output stage. The output stage includes an output piston 2, a spring 3, a buffer pad 4, a screw sleeve 5, and a first elastic body 6. The drive stage includes a second elastic body 7, a steel ball 8, a drive piston 9, two permanent magnets 10, a buffer pad 11, a buffer pad 12, two electromagnetic coils 13, a screw sleeve 14, and a screw sleeve 15. The drive stage is driven by supplying power to the two electromagnetic coils 13 with a low-voltage small signal. The output stage is a high-power output stage, which, based on the first elastic body 6 and the steel ball 8, enables reliable locking of the output piston 2 under high load conditions.

[0041] The drive stage and output stage are both housed within housing 1, and housing 1 has the following structure: Figure 4 As shown, the housing 1 includes an output stage piston chamber 101 and a drive stage piston chamber 102 arranged side by side. A steel ball movement chamber 103 is formed on the wall between the two piston chambers to accommodate the steel ball 8, serving as a movement channel for the steel ball 8 and enabling the steel ball 8 to move and be fixed in position. An output piston 2 is installed inside the output stage piston chamber 101. A through hole is formed on the housing wall at one end of the chamber for the output piston 2 to enter and exit. A first elastic body 6 is provided between the output piston 2 and the end with the through hole, generating an elastic force along the axial direction of the chamber. Electromagnetic coils 13 are installed at both ends of the drive stage piston chamber 102. A drive piston 9 is installed inside the chamber, and permanent magnets with opposite magnetic field directions are installed at both ends of the drive piston 9. 10, together with two electromagnetic coils 13, forms a redundant drive structure, with one end attracting and the other end repelling; a second elastic body 7 is also installed in the cavity, and the installation direction of the second elastic body 7 relative to the drive piston 9 is the same as the direction of the first elastic body 6 relative to the output piston 2; under the combined action of the electromagnetic force at both ends and the elastic force of the second elastic body 7, the drive piston 9 reciprocates along the drive stage piston cavity 102, causing the steel ball 8 to move horizontally in the steel ball movement cavity 103, controlling the output piston 2 to lock or unlock, so that the output piston 2 moves under the drive of the elastic force of the first elastic body 6, and reaches the unlocked state from the linkage state through the unlocking process, realizing the linkage and unlocking of the air rudder and the gas rudder.

[0042] Preferably, the housing 1 is made of aluminum alloy to reduce the weight of the mechanism, and the roughness of the piston cavity is required to be above 0.8. Considering the connection strength of the mechanism and the wear of repeated testing, the piston is made of stainless steel and heat-treated to HRC≥40. When installing the piston, apply an appropriate amount of grease to the piston and piston cavity to reduce friction and ensure smooth movement.

[0043] Preferably, the electromagnetic coil is supplied with a voltage of 24V. The permanent magnet 10 is made of samarium cobalt magnet, which has strong magnetic properties, high temperature resistance, and strong demagnetization resistance.

[0044] In one possible implementation, the output piston 2 is a variable-diameter cylindrical structure. The first section is a pin structure that enters and exits through the through hole of the output stage piston chamber 101, used to control the linkage and unlocking of the air rudder and gas rudder. The second section is the piston body, which cooperates with the output stage piston chamber 101 and moves within the chamber. The outer wall of the piston body is provided with a first annular groove. The third section is a cylindrical section with the same diameter as the first annular groove. The cylindrical section cooperates with the steel ball 8 to lock the output piston 2 in the linkage state. The first annular groove cooperates with the steel ball 8 to lock the output piston 2 in the unlocking state.

[0045] In one possible implementation, the driving piston 9 is also a variable-diameter cylindrical structure, such as... Figure 5 As shown, the outer wall surface is provided with a second annular groove 902, which cooperates with the steel ball 8 to unlock the output piston 2 and lock the drive piston 9 at the same time; permanent magnet mounting holes 901 and mounting holes 903 are provided at both ends of the drive piston 9, and the two permanent magnets 10 are press-fitted into the mounting holes 901 and mounting holes 903 with an interference fit, and are fixed by epoxy resin potting after being press-fitted into place.

[0046] The diameter changes of the output piston 2 and the drive piston 9 are both transitioned by tapered sections, and the intersection is smoothed. When the output piston 2 and the drive piston 9 move in the piston cavity, they generate a horizontal thrust on the steel ball 8, causing the steel ball 8 to move in a predetermined direction.

[0047] Preferably, in order to improve the system response speed, both the output piston 2 and the drive piston 9 adopt a hollow structure design, which minimizes the mass of moving parts while ensuring strength requirements, thereby improving the system response speed and resistance to acceleration and impact environments.

[0048] In one possible implementation, a buffer pad 4 is installed on the side of the output stage piston chamber 101 opposite to the opening end, and buffer pads 11 and 12 are installed at both ends of the drive stage piston chamber 102 respectively to reduce the impact force on the output piston 2 and drive piston 9 during state switching.

[0049] Preferably, the buffer pads 4, 11 and 12 can be made of different materials and have different thicknesses depending on the specific design of the first elastomer 6 and the second elastomer 7. The materials include, but are not limited to, rubber buffer pads, polytetrafluoroethylene buffer pads and metal buffer pads.

[0050] In one possible implementation, the buffer pad 4, as... Figure 6 As shown, the buffer pad 4 is made of insulating material and has two separate reed slots 401 and 403. Two reeds 3 are installed in each slot. The slot size is slightly larger than the reed size to ensure that when the output piston 2 is in the unlocked state and contacts the buffer pad, the reeds can deform and retract into the slots. The reeds 3 are fixed in the slots using an interference fit, ensuring reliable installation while achieving product miniaturization. The reeds 3 have leads connected to the controller to provide a feedback signal after unlocking. After the unlocking process, under the action of the output piston 2, the reeds 3 deform and retract into the slots, and the output piston 2 reliably contacts the two reeds 3, making them conductive. The two reeds 3 transmit the unlocking signal to the controller through their leads, providing feedback on the working status of the mechanism.

[0051] Preferably, the spring 3 is pressed into the buffer pad 4 via an interference fit to ensure that the spring 3 is insulated from the housing 1. After the buffer pad 4 and the spring 3 are installed in place, they are reinforced with epoxy resin potting.

[0052] Preferably, the material of the reed 3 is an elastic material with good elasticity and fatigue resistance. At the same time, the compression of the reed is controlled after the output piston 2 is unlocked to avoid plastic deformation caused by repeated testing, which would cause the contact pressure between the reed 3 and the output piston 2 to drop.

[0053] In one possible implementation, a buffer pad 4 is installed in the hole of the threaded sleeve 5 in the output stage piston chamber 101; in the drive stage piston chamber 102, an electromagnetic coil 13 and a buffer pad 11 are sequentially installed in the hole of the threaded sleeve 14 at one end, and another electromagnetic coil 13 and a buffer pad 12 are sequentially installed in the hole of the threaded sleeve 15 at the other end; after being potted and fixed, they are installed into the housing 1.

[0054] Preferably, both the threaded sleeve 5 and the threaded sleeve 14 are designed with binding holes at their ends for binding stainless steel wires to prevent loosening and to prevent the threaded sleeves from loosening after repeated impact tests.

[0055] In one possible implementation, through holes are provided between the screw sleeve 5 and the buffer pad 4 to reset the output piston 2; through holes are also provided between the screw sleeve 14 and the buffer pad 11 to reset the drive piston 9 when no power is applied; the linkage state and the unlocking state can be freely switched through external tooling operation, so that the linkage unlocking mechanism can be reused.

[0056] When the first elastic body 6 and the second elastic body 7 are in the extended state, the force exerted on the output piston 2 and the drive piston 9 is greater than the inertial force under maximum overload and leaves sufficient margin.

[0057] Preferably, the margin value is 1.5 times, that is, the maximum overload a of the linkage unlocking mechanism. max =50g. Based on the mass m2 of output piston 2 and the mass m9 of driving piston 9, the maximum inertial force F of output piston 2 is calculated. 2max =m2×a max Similarly, the maximum inertial force F driving piston 9 was calculated. 9max The force F exerted by the first elastic body 6 on the output piston 2 in the extended state. s6 =k6×Δx6≥1.5F 2max k6 is the stiffness coefficient of the first elastic body 6, Δx6 is the compression of the first elastic body, and similarly, the force F exerted by the second elastic body 7 on the piston in the extended state is... s7 =k7×Δx7≥1.5F 9max k7 is the stiffness coefficient of the second elastic body 7, and Δx7 is the compression of the second elastic body. The minimum elastic force design value F for the first elastic body 6 and the second elastic body 7 is obtained respectively. s6 and F s7 This ensures that the output piston 2 and the drive piston 9 remain effectively fixed under the action of the first elastic body 6 and the second elastic body 7 under the maximum overload condition.

[0058] During operation, the linkage unlocking mechanism only requires power during the unlocking process; power is de-energized in both the linkage and unlocking states. Specifically:

[0059] like Figure 1 As shown, when the linkage unlocking mechanism is in the linkage state, the drive piston 9 reaches the top of the drive stage piston chamber 102 under the action of the second elastic body 7 and contacts the buffer pad 11; the steel ball 8 falls into the connection between the top cylindrical section and the transition cone section of the output piston 2, and the right side is restricted by the cylindrical section of the drive piston 9 and cannot move, locking the output piston 2, so that the pin section of the output piston 2 remains extended out of the output stage piston chamber 101, controlling the linkage of the air rudder and the gas rudder.

[0060] like Figure 2As shown, when unlocking is required, the linkage unlocking mechanism enters the unlocking process, energizing the electromagnetic coils 13 at both ends. The upper permanent magnet experiences repulsive force, and the lower permanent magnet experiences attractive force. Under the action of the electromagnetic field, the drive piston 9 moves to the other end of the drive piston cavity 102, compressing the second elastic body 7. When the bottom of the drive piston 9 contacts the buffer pad 12, the drive piston 9 moves to its position. At this time, the second annular groove 902 of the drive piston 9 moves to the position of the steel ball 8, and the limit of the steel ball 8 is released. Under the action of the first elastic body 6, the output piston 2 pushes the steel ball 8 to move horizontally, pushing the steel ball 8 into the second annular groove 902 of the drive piston 9. The output piston 2 unlocks, and the drive piston 9 locks. The output piston 2 moves from the outside to the inside until it is fully inside the output stage piston cavity 101, contacts the spring 3 and is squeezed and deformed into the spring groove, and finally contacts the buffer pad 4 to reach the unlocking position. At this time, the first annular groove of the output piston 2 moves to the position of the steel ball 8, the limit of the steel ball 8 is released, and the drive piston 9 unlocks at the same time. When the electromagnetic coils 13 at both ends are de-energized, the drive piston 9, under the action of the second elastic body 7, pushes the steel ball 8 to move horizontally in the opposite direction, pushing the steel ball into the first annular groove of the output piston 2. After that, the cylindrical section of the drive piston 9 cooperates with the steel ball 8 to limit the steel ball 8 and relock the output piston 2. The drive piston 9 continues to move upward to return to the initial position and maintain it, completing the unlocking of the air rudder and the gas rudder.

[0061] like Figure 3 As shown, when the linkage unlocking mechanism is in the unlocked state, the pin section of the output piston 2 is locked in the output stage piston chamber 101 under the combined action of the first elastic body 6 and the steel ball 8, and the drive piston 9 remains stationary in the initial position.

[0062] When the unlocking process is completed and reset is required, the tooling is used to push the drive piston 9 to the other end of the drive piston cavity through the through hole between the screw sleeve 14 and the buffer pad 11 to reach the unlocking position. At this time, the annular groove 902 of the drive piston 9 moves to the position of the steel ball 8. The electromagnetic coil 13 can also achieve the same effect when energized. At this time, the tooling is used to push the output piston 2 to compress the first elastic body 6 through the through hole between the screw sleeve 5 and the buffer pad 4. The cone surface of the first annular groove of the output piston 2 pushes the steel ball 8 into the groove of the drive piston 9. Continue to push the output piston 2 until its top cylindrical section moves to the position of the steel ball. At this time, the tooling of the drive piston 9 can be removed. Under the action of the second elastic body 7, the drive piston 9 moves to the top of the drive stage piston cavity 102 and pushes the steel ball into the connection between the cylindrical section and the transition cone section of the output piston 2. The drive piston 9 continues to move until it contacts the buffer pad 11. At this time, the mechanism is in a linkage state. The steel ball 8 cooperates with the cylindrical section of the drive piston 9 and is limited. The output piston 2 is locked, reliably extended and not retracted, locking the two drive parts of the air rudder and the gas rudder, realizing the linkage effect.

[0063] It is understood that this invention has been described through embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific circumstances without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

[0064] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A linkage unlocking mechanism for air rudder and gas rudder based on a steel ball lock, characterized in that: Designed as a two-stage structure, the drive stage and the output stage are housed together in a housing (1). The housing (1) has a piston chamber (101) for the output stage and a piston chamber (102) for the drive stage arranged side by side. A steel ball movement chamber (103) is opened on the wall between the two piston chambers to accommodate the steel ball (8). An output piston (2) is provided in the output stage piston chamber (101). A through hole is opened on the shell wall at one end of the chamber for the output piston (2) to enter and exit. A first elastic body (6) is provided between the output piston (2) and the opening end to generate elastic force along the axial direction of the chamber. Electromagnetic coils (13) are installed at both ends of the drive stage piston chamber (102). A drive piston (9) is arranged between the two electromagnetic coils (13). Permanent magnets (10) with opposite magnetic field directions are installed at both ends of the drive piston (9). They form a redundant drive structure with the two electromagnetic coils (13), with one end attracting and the other end repelling. A second elastic body (7) is also installed in the drive stage piston chamber (102). The installation direction of the second elastic body (7) relative to the drive piston (9) is the same as the direction of the first elastic body (6) relative to the output piston (2). Under the combined action of electromagnetic forces at both ends and elastic forces of the second elastic body (7), the drive piston (9) moves along the piston chamber (102) of the drive stage, causing the steel ball (8) to move horizontally in the steel ball movement chamber (103), controlling the output piston (2) to lock or unlock. The output piston (2) moves under the elastic force of the first elastic body (6), and goes from the linkage state to the unlocked state through the unlocking process, realizing the linkage and unlocking state switching between the air rudder and the gas rudder. The linkage unlocking mechanism only requires power during the unlocking process; it is de-powered in both the linkage and unlocking states. The specific operating modes of the linkage unlocking mechanism in the linkage, unlocking, and unlocking states are as follows: When the linkage unlocking mechanism is in the linkage state, the drive piston (9) remains stationary in the initial position under the action of the second elastic body (7). Relying on the cooperation of the steel ball (8) and the drive piston (9), the output piston (2) is locked, so that the output piston (2) remains extended out of the output stage piston chamber (101), and the air rudder and gas rudder are linked. During the unlocking process of the linkage unlocking mechanism, the electromagnetic coils (13) at both ends are energized, and the driving piston (9) moves under the action of the electromagnetic field, overcoming the force of the second elastic body (7). After the movement is in place, the limit of the steel ball (8) is released, and the output piston (2) pushes the steel ball (8) to move horizontally under the action of the first elastic body (6). The output piston (2) is unlocked, and at the same time the driving piston (9) is locked. The output piston (2) moves from the outside to the inside until it is fully entered into the output stage piston chamber (101). When the electromagnetic coils (13) at both ends are de-energized, the driving piston (9) pushes the steel ball (8) to move horizontally in the opposite direction under the action of the second elastic body (7), and the output piston (2) is locked again. At the same time, the driving piston (9) is unlocked and returns to the initial position, completing the unlocking of the air rudder and the gas rudder. When the linkage unlocking mechanism is in the unlocked state, the first elastic body (6) and the steel ball (8) serve as redundant locking structures in the unlocked state, jointly providing locking force to lock the output piston (2) in the output stage piston chamber (101), and drive the piston (9) to remain stationary in the initial position under the action of the second elastic body (7).

2. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 1, characterized in that: During the unlocking process of the linkage unlocking mechanism, the drive piston (9) reciprocates along the drive stage piston chamber (102), and the output piston (2) moves unidirectionally along the output stage piston chamber (101).

3. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 1, characterized in that: The output piston (2) is a variable diameter cylindrical structure. The first section is a pin structure that enters and exits through the through hole of the output stage piston chamber (101) and is used to control the linkage and unlocking of the air rudder and the gas rudder. The second section is the piston body, which cooperates with the output stage piston chamber (101) and moves in the chamber. The outer wall of the piston body is provided with a first annular groove. The third section is a cylindrical section with the same diameter as the first annular groove. The cylindrical section cooperates with the steel ball (8) to lock the output piston (2) in the linkage state. The first annular groove cooperates with the steel ball (8) to lock the output piston (2) in the unlocking state. The driving piston (9) is also a variable diameter cylindrical structure with a second annular groove on its outer wall surface, which cooperates with the steel ball (8) to unlock the output piston (2) and lock the driving piston (9). The diameter changes of the output piston (2) and the drive piston (9) are both transitioned by a tapered section, and a smooth transition is made at the intersection. When the output piston (2) and the drive piston (9) move in the piston cavity, they generate a horizontal thrust on the steel ball (8), causing the steel ball (8) to move in the predetermined direction.

4. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 1, characterized in that: The driving piston (9) has a first mounting hole (901) and a second mounting hole (903) for permanent magnets at both ends, and two permanent magnets (10) are fixed in the first mounting hole (901) and the second mounting hole (903).

5. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 1, characterized in that: A buffer pad (4) is installed on the side opposite to the opening end in the output stage piston chamber (101), and a first buffer pad (11) and a second buffer pad (12) are installed at both ends in the drive stage piston chamber (102) to reduce the impact force of the output piston (2) and the drive piston (9) during state switching.

6. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 5, characterized in that: The buffer pad (4) is made of insulating material. Two separate first reed slots (401) and second reed slots (403) are provided in the buffer pad (4). Reeds (3) are installed in the first reed slot (401) and the second reed slot (403) respectively. When the linkage unlocking mechanism is in the linkage state, the reeds (3) in the two reed slots are in the insulating state. After the unlocking process is completed, under the action of the output piston (2), the reeds (3) deform and retract into the reed slots. The output piston (2) contacts the two reeds (3), so that the two reeds (3) are connected. The two reeds (3) transmit signals to the controller through the lead wires to provide feedback on the working status of the linkage unlocking mechanism.

7. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 5, characterized in that: In the output stage piston chamber (101), a buffer pad (4) is fixedly installed in the hole of the screw sleeve (5); in the drive stage piston chamber (102), an electromagnetic coil (13) and a first buffer pad (11) are fixedly installed in the hole of the first screw sleeve (14) at one end, and another electromagnetic coil (13) and a second buffer pad (12) are fixedly installed in the hole of the second screw sleeve (15) at the other end.

8. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 7, characterized in that: Through holes are provided between the screw sleeve (5) and the buffer pad (4) for resetting the output piston (2); through holes are provided between the first screw sleeve (14) and the first buffer pad (11) for resetting the drive piston (9). The unlocking and linkage states can be manually switched by external tooling, making the linkage unlocking mechanism reusable.

9. The air rudder and gas rudder linkage unlocking mechanism based on a steel ball lock according to claim 1, characterized in that: In the extended state, the force exerted by the first elastic body (6) and the second elastic body (7) on the output piston (2) and the drive piston (9) is greater than the inertial force generated by the output piston (2) and the drive piston (9) under the maximum overload condition of the linkage unlocking mechanism, and there is sufficient margin. The design margin is taken as 1.5 times.

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