Servo valve pilot structure based on bilateral smart materials

Abstract

The present invention discloses a servo valve pilot structure based on bilateral intelligent materials, comprising: a base, on which a receiving cavity is provided; a flexible hinge, a first end of which is fixedly connected to the base and a second end of which is located in the receiving cavity; two actuators, which are arranged on opposite sides of the base, the actuating ends of the two actuators are both located in the receiving cavity and abut against the second end of the flexible hinge from opposite sides; a pressure distribution component, one end of which is fixedly connected to the second end of the flexible hinge; the pressure distribution component is used to deflect under the action of the pressure difference between the two actuators to achieve state switching. The present invention can improve the performance of large hydraulic pipeline systems with high working pressure. By being installed in the hydraulic pipeline system, functions such as flow control of the pipeline system, fluid pulsation suppression, and noise suppression of the hydraulic system can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of servo control of fluid mechanical devices, and in particular to a servo valve pilot structure based on bilateral intelligent materials. Background Art

[0002] In traditional fluid machinery systems, especially in engineering hydraulic piping systems, electro-hydraulic servo valves are key components for controlling hydraulic energy. They convert low-power electrical signals into hydraulic power to drive large mechanical structures. Electro-hydraulic servo valves, especially high-frequency servo valves, play a crucial role in flow control, fluid pulsation suppression, and noise reduction in hydraulic piping systems.

[0003] In recent years, the application of smart materials in fluid machinery has garnered widespread attention. Piezoelectric ceramics and giant magnetostrictive materials, in particular, have become a research hotspot for high-frequency servo valve drive structures due to their advantages such as fast frequency response and high control precision. Currently, the primary drive structure for the fluidic tube servo valve in high-frequency servo valves is an electromagnetic torque motor. This motor controls the current in the coil magnetic group to drive the armature structure suspended in the magnetic field, thereby driving the fluidic tube structure to achieve minute rotations.

[0004] At present, the frequency response of the pilot structure of the servo valve of the jet tube based on bilateral smart materials is only 400Hz at most, and the frequency response of the pilot structure of the nozzle flapper valve is generally 600Hz, and the maximum does not exceed 800Hz.

[0005] How to further improve the frequency response of the pilot structure is one of the important issues that need to be solved urgently in this field. Summary of the Invention

[0006] The present invention aims to provide a servo valve pilot structure based on bilateral smart materials to address the shortcomings of existing technologies. This structure further enhances the pilot structure's frequency response and improves the performance of large, high-pressure hydraulic piping systems. When installed in a hydraulic piping system, it achieves flow control, fluid pulsation suppression, and noise reduction.

[0007] The present invention provides a servo valve pilot structure based on bilateral smart materials, which includes:

[0008] A base body, wherein the base body is provided with an accommodating cavity;

[0009] a flexible hinge, a first end of which is fixedly connected to the base body and a second end of which is located in the accommodating cavity;

[0010] Two actuators are disposed oppositely on two sides of the base, wherein the actuating ends of the two actuators are both located in the accommodating cavity and abut against the second end of the flexible hinge from opposite sides;

[0011] A pressure distribution component, one end of which is fixedly connected to the second end of the flexible hinge; the pressure distribution component is used to deflect under the action of the pressure difference between the two actuators to achieve state switching.

[0012] As described above, in the servo valve pilot structure based on bilateral smart materials, optionally, the pressure distribution component has at least three states:

[0013] In the first state, the second end of the flexible hinge deflects in the first direction under the joint action of the two actuators;

[0014] In the second state, the second end of the flexible hinge deflects in a second direction under the joint action of the two actuators; the first direction is opposite to the second direction;

[0015] In the third state, when the second end of the flexible hinge is not acted upon by the actuator, or is acted upon by two actuators with equal and opposite forces, the second end of the flexible hinge is in a balanced position between the first state and the second state.

[0016] The servo valve pilot structure based on bilateral smart materials as described above, wherein, optionally, a first through hole and a second through hole are provided on the base body;

[0017] The first through hole and the second through hole are both communicated with the accommodating cavity and are respectively located on two opposite sides of the base body; the center line of the first through hole and the center line of the second through hole are located on the same straight line.

[0018] The servo valve pilot structure based on bilateral smart materials as described above, wherein, optionally, a third through hole is further provided on the base body;

[0019] The pressure distribution member passes through the third through hole, and one end of the pressure distribution member away from the flexible hinge is located outside the base;

[0020] The center line of the first through hole and the center line of the second through hole are both perpendicular to the straight line where the center line of the third through hole is located.

[0021] As described above, in the servo valve pilot structure based on bilateral smart materials, optionally, a sealing member is installed between the pressure distribution member and the third through hole.

[0022] As described above, in the servo valve pilot structure based on bilateral smart materials, optionally, one end of the actuating end resting against the flexible hinge is provided with a protrusion, and the protrusion is a partial spherical structure.

[0023] In the servo valve pilot structure based on bilateral smart materials as described above, optionally, the pressure distribution component is a jet tube or a baffle.

[0024] As described above, in the servo valve pilot structure based on bilateral smart materials, optionally, the actuator is made of piezoelectric ceramics or giant magnetostrictive material.

[0025] As described above, in the servo valve pilot structure based on bilateral smart materials, optionally, the dimension of the flexible hinge in the direction from the first end to the second end in the direction of the line connecting the two actuating ends first decreases and then increases.

[0026] The servo valve pilot structure based on bilateral smart materials as described above, wherein, optionally, it further includes a locking nut;

[0027] The actuator is threadedly connected to the base;

[0028] The locking nut is threadedly connected to the actuator, and the locking nut rests on the base.

[0029] Compared to existing technologies, this invention employs a housing cavity within a base, a flexible hinge within the cavity, and actuators on either side of the flexible hinge. One end of a pressure distribution member is secured to the second end of the flexible hinge. The pressure differential generated by the two actuators achieves minute elastic angular deformation of the pressure distribution member. The use of intelligent materials in the actuators, combined with the flexible hinge, enables the pilot structure to achieve a frequency response of several kilohertz.

[0030] During operation, the use of flexible hinges and bilateral smart materials, coupled with mechanical hard contact, avoids the zero-position drift caused by external environmental interference such as temperature changes, which occurs with traditional electromagnetic torque motors that rely on magnetic clearance. Furthermore, the use of bilateral drive effectively eliminates the power-off, full-rudder failure phenomenon associated with unilateral actuators. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of embodiment 1 of the present invention;

[0032] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0033] Description of reference numerals:

[0034] 1-base, 2-flexible hinge, 3-actuator, 4-pressure distribution part, 5-seal, 6-locking nut;

[0035] 11 - accommodating cavity, 12 - first through hole, 13 - second through hole, 14 - third through hole;

[0036] 31-actuating end, 32-protrusion. DETAILED DESCRIPTION

[0037] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0038] In the background art, in addition to the already pointed out need for further improvement in the frequency response of the pilot structure, the current design of high-frequency servo valves also has the following shortcomings:

[0039] 1. The jet tube servo valve utilizes the principle of jet pressure distribution, offering advantages such as strong resistance to contamination, minimal erosion and wear, and high reliability. However, servo valves based on traditional electromagnetic torque motors, due to their magnetic levitation positioning assembly, are susceptible to interference from the external operating environment. For example, temperature fluctuations can cause zero position deviations. The magnetic levitation structure is less stable, and the torque motor's driving force is relatively low, impacting key performance indicators such as the main valve core's output frequency response and control accuracy.

[0040] 2. Direct-drive valves based on smart material actuation eliminate the dynamic damping associated with hydraulic amplifiers, resulting in superior frequency response compared to two-stage servo valves. However, the fundamental principle of smart material direct-drive valves is to directly drive the main valve core using a smart material drive structure. This places high demands on the drive structure's inherent performance, and to achieve a faster frequency response, a higher output power is required. Consequently, direct-drive valve structures generally have a low output flow rate, making them difficult to meet the high-pressure, high-flow requirements of large hydraulic piping systems.

[0041] 3. The pilot stage of a nozzle flapper valve driven by an intelligent material structure achieves pressure control by using a flapper to control the pressure drop of the driving hydraulic pressure across the main valve core. To maintain the servo valve's pressure gain within a controllable range, the internal flow path of the pilot stage is typically small. As a result, the nozzle flapper valve has poor contamination resistance. Furthermore, erosion and wear of this valve structure can affect the pressure of both nozzles, resulting in a low lifespan and reliability of the nozzle flapper valve.

[0042] 4. Due to the inherent limitations of common smart materials, such as piezoelectric ceramics and magnetostrictive materials, which can only output thrust in a single direction and cannot withstand tensile loads, the design of a single-sided actuator in series with a high-performance disc spring can result in a "power-off, full-rudder" failure. This occurs when the servo valve loses power due to a system failure or an inability to obtain an input signal, causing the disc spring to drive the main valve spool completely to one side, resulting in a full-rudder deflection failure. This can significantly affect the load performance and reliability of the hydraulic piping system.

[0043] In order to solve the problems in the background technology and overcome the defects pointed out in the above-mentioned prior art, the present invention proposes the following embodiments to solve the problems.

[0044] Example 1

[0045] Please refer to Figure 1 This embodiment proposes a servo valve pilot structure based on bilateral smart materials, comprising a base 1, a flexible hinge 2, two actuators 3, and a pressure distribution component 4. The base 1 supports the entire structure, the flexible hinge 2 is used to mount the pressure distribution component 4, and the two actuators 3 apply pressure to the flexible hinge 2 from both sides, causing it to undergo a slight angular displacement, thereby changing the state of the pressure distribution component 4.

[0046] Specifically, the base body 1 is provided with a receiving cavity 11 . The receiving cavity 11 is used to install the flexible hinge 2 and accommodate a portion of the pressure distribution component 4 and the actuating end 31 of the actuator 3 .

[0047] In specific applications, the base 1 is also used to connect to the main valve core structure through the bottom thread or other structure. The connection between this structure and the main valve core structure can refer to the methods in the prior art, and those skilled in the art can implement it, so I will not repeat it here.

[0048] The first end of the flexible hinge 2 is fixedly connected to the base 1, and the second end is located within the accommodating cavity 11. In practice, to facilitate installation, the upper end of the accommodating cavity 11 may be provided with an opening, and a first groove may be provided at the opening. The first end of the flexible hinge 2 is positioned relative to the base 1 via the first groove and connected to the base via welding or interference fit.

[0049] Two actuators 3 are positioned opposite each other on opposite sides of the base 1. The actuating ends 31 of each actuator 3 are located within the accommodating cavity 11 and abut the second end of the flexible hinge 2 from opposite sides. In practice, the connection between the actuator 3 and the base 1 can be achieved through interference fit, snap-fit, welding, or other methods. However, considering the requirements for installation accuracy, axial adjustment of the actuator 3, maintenance and disassembly, and replacement of faulty actuators, a threaded connection is preferred. Specifically, fine-tuning of the threads allows for precise assembly.

[0050] One end of the pressure distribution member 4 is fixedly connected to the second end of the flexible hinge 2. In practice, the pressure distribution member 4 can be installed in a second groove below the flexible hinge using an interference fit, enabling the pressure distribution structure to perform a slight reciprocating deflection about the rotation center of the flexible hinge. The pressure distribution member 4 is configured to deflect in response to a pressure difference between the two actuators 3 to achieve state switching.

[0051] In practice, the above-described structure enables the displacement output performance of the pilot structure to be proportional to the output performance of the actuator 3. Specifically, the greater the output displacement at the output end of the actuator 3, the greater the output of the pilot structure. The greater the output force of the actuator 3, the greater the rotational torque used to drive the flexible hinge 2 and the pressure distribution member 4, and the faster the frequency response of the pilot structure. Furthermore, with the contact point between the actuator 3 and the flexible hinge 2 as the driving input point, the distance from this point to the rotation center as the input lever arm, and the distance from the point of application of the pressure distribution member 4 to the rotation center as the output lever arm, the displacement output performance is proportional to the ratio of the input and output lever arms. Reducing the input lever arm (i.e., reducing the cutout radius of the flexible hinge 2) or increasing the output lever arm (i.e., extending the length of the jet tube) increases the ratio of the input and output lever arms, resulting in a more pronounced displacement amplification performance of the pilot structure. Therefore, the pilot structure, which is installed on the main valve core structure of a high-response servo valve via a threaded connection, serves as its power amplification pilot structure. Adaptability to the main valve core structure can be achieved by modifying some of the structures of the base 1. The pilot structure involved features compactness, simple zero-position adjustment, insensitivity to machining and assembly errors, strong maintainability, and fast frequency response. Furthermore, by varying the specifications and parameters of the smart material actuator 3 and the length of the fluidic tube, the output performance of the pilot structure can be rapidly altered, enabling it to quickly adapt to the requirements of different operating environments and achieve adaptability to various work scenarios, enabling flow control, fluid pulsation suppression, and hydraulic system noise control in various hydraulic piping systems.

[0052] In a specific implementation, the pressure distribution member 4 has at least three states:

[0053] In the first state, the second end of the flexible hinge 2 deflects toward the first direction under the joint action of the two actuators 3 .

[0054] In the second state, the second end of the flexible hinge 2 is deflected in a second direction under the joint action of the two actuators 3; the first direction is opposite to the second direction;

[0055] In the third state, when the second end of the flexible hinge 2 is not acted upon by the actuator 3, or is acted upon by two actuators 3 with equal and opposite forces, the second end of the flexible hinge 2 is in a balanced position between the first state and the second state.

[0056] Specifically, after complete installation, the minimum cut thickness position in the flexible hinge serves as the rotation center. Because two left and right actuators 3 drive the flexible hinge 2, the output displacement and force of the two actuators 3 are varied to precisely control the micro-elastic angular deformation of the flexible hinge 2 about the rotation center. When the output of the left actuator 3 is greater than that of the right actuator 3, the force causes the structure below the flexible hinge cutout to deflect rightward about the rotation center, driving the pressure distribution member 4 to deflect slightly counterclockwise. At this point, the pressure distribution member 4 is in the first state. Conversely, when the output of the left actuator 3 is less than that of the right actuator 3, the flexible hinge 2 and the pressure distribution member 4 deflect clockwise about the rotation center. At this point, the pressure distribution member 4 is in the second state. When the actuators 3 on either end exert no force on the flexible hinge 2, or when the forces acting on them are equal in magnitude and opposite in direction, the pressure distribution member 4 is in a balanced position between the first and second states.

[0057] In practice, to facilitate installation of the two actuators 3, the base 1 is provided with a first through-hole 12 and a second through-hole 13. The first through-hole 12 and the second through-hole 13 are used to install the actuators 3. The first through-hole 12 and the second through-hole 13 are both connected to the accommodating cavity 11 and are located on opposite sides of the base 1. The centerline of the first through-hole 12 and the centerline of the second through-hole 13 are co-linear.

[0058] To better achieve the desired effects of the present invention, the base 1 is further provided with a third through-hole 14. The pressure distribution member 4 passes through the third through-hole 14, with the end of the pressure distribution member 4 away from the flexible hinge 2 located outside the base 1. The centerlines of the first through-hole 12 and the second through-hole 13 are both perpendicular to the line containing the centerline of the third through-hole 14. This ensures that the pressure distribution member 4 is in a balanced position in the third state.

[0059] Preferably, a seal 5 is installed between the pressure distribution component 4 and the third through hole 14. Made of a spring material, the seal 5 utilizes an interference fit to achieve a sealing effect, utilizing a mechanical surface seal to prevent leakage of high-pressure fluid within the pilot structure and at the outlet, thereby preventing damage to other components. Due to its elasticity, the seal 5 does not affect the deflection of the pressure distribution component 4.

[0060] The end of the actuating end 31 that abuts against the flexible hinge 2 is provided with a protrusion 32 having a partially spherical structure. When the protrusion 32 makes hard contact with the plane of the flexible hinge 2, even if there are certain processing and assembly errors between the two components, good output performance can still be guaranteed.

[0061] In a specific implementation, the actuator 3 is made of piezoelectric ceramics or giant magnetostrictive materials. Specifically, the actuator 3 is made of smart materials, preferably piezoelectric ceramics or giant magnetostrictive materials. Driven by the bilateral smart materials, the output of the pilot structure, under the excitation of a step signal, can achieve a frequency response of several thousand hertz for the pilot structure of the servo valve based on flexible hinges and bilateral smart materials. This compares to the maximum frequency response of the pilot structure of current jet tube servo valves based on bilateral smart materials, which is only around 400 Hz. The pilot structure frequency response of nozzle flapper valves is generally 600 Hz, with a maximum of no more than 800 Hz. Therefore, the dynamic performance of the jet tube servo valve is far superior to that of current commercial high-frequency servo valves.

[0062] Specifically, the dimension of the flexible hinge 2 along the line connecting the two actuating ends 31 decreases and then increases from the first end to the second end thereof. The point where the dimension is the smallest along the line connecting the two actuating ends 31 is the rotation center.

[0063] In practice, to ensure precise installation of the actuator 3 and maintain a certain level of fine-tuning capability, a locking nut 6 is also included. Specifically, the actuator 3 is threadedly connected to the base 1; the locking nut 6 is threadedly connected to the actuator 3 and abuts against the base 1. The bilateral smart material actuator is connected to the base using a double-thread locking mechanism. This ensures a certain level of fine-tuning capability while maintaining tight compression through the elasticity of the threads. Furthermore, the threaded assembly method is simpler, allowing for easy replacement in the event of a fault, and improving maintainability.

[0064] Preferably, in this embodiment, the pressure distribution member 4 can be a jet tube. When in the first or second state, the jet tube and the high-pressure fluid in the oil channel produce a small counterclockwise deflection to cooperate with the main valve core to redistribute the pressure. The sealing member 5 separates the accommodating chamber and the jet receiving chamber by means of an interference fit.

[0065] Example 2

[0066] This embodiment is a further improvement based on the first embodiment. The similarities are not repeated here, and only the differences are described below.

[0067] Please refer to Figure 2 The only difference between this embodiment and embodiment 1 is that the pressure distribution member 4 is a baffle, that is, the pressure distribution in the main valve core is achieved by deflection of the baffle.

[0068] Since the pressure distribution member 4 is set as a baffle, the base 1 on both sides of the baffle is provided with oil channels and corresponding grooves to achieve the purpose of pressure distribution. Figure 2And under the condition of existing technology, it can be achieved. No more details are given here.

[0069] Example 3

[0070] This embodiment further illustrates the first and second embodiments to illustrate their principles and effects.

[0071] The high-frequency response characteristics of the servo valve pilot structure based on bilateral smart materials will be explained through the following derivation.

[0072] The present invention has a high frequency response characteristic, assuming F a is the difference in output force between the bilateral smart material actuators, with the right direction being positive. The distance between the actuator and the flexible hinge, i.e. the input lever arm, is l1. For the pressure distribution structure (such as the jet tube, baffle, etc.), the input torque M is a is the product of force and lever arm, that is:

[0073] M a =F a ·l1(1)

[0074] The flexible hinge displacement amplification structure rotates around the rotation center, so the relationship between the rotation of the structure and the output force of the actuator is:

[0075]

[0076] Among them, F a is the difference in output force between the bilateral smart material actuators, with the right direction being positive. The distance from the flexible hinge, i.e., the input lever arm, is l1. J is the moment of inertia of the flexible hinge-jet tube-feedback spring assembly. B is the viscous damping coefficient of the flexible hinge-jet tube-feedback spring assembly. k is the rotational stiffness of the flexible hinge. θ is the rotation angle of the flexible hinge-jet tube-feedback spring assembly. T b It is the load torque generated by the elastic deformation of the feedback spring rod.

[0077] Based on the current research in the field of smart materials, such as the output force of piezoelectric ceramic materials can reach thousands of Newtons. According to analysis, under the drive of bilateral smart materials, the output of the pilot structure is stimulated by a step signal. The frequency response of the servo valve pilot structure based on the flexible hinge 2 and bilateral smart materials involved can reach several thousand Hertz. The current jet tube servo valve pilot structure based on bilateral smart materials has a maximum frequency response of only about 400Hz, and the pilot structure frequency response of the nozzle flapper valve is generally 600Hz, and the maximum does not exceed 800Hz. Therefore, the dynamic performance of the jet tube servo valve involved is much higher than that of the current commercial high-frequency servo valve.

[0078] The following description is made with respect to the long life characteristic of the present invention.

[0079] In the servo valve pilot structure based on bilateral smart materials involved in the present invention, since the cutout position of the flexible hinge 2 serves as the rotation center, it is driven by the high-frequency smart material actuator 3 and is most likely to produce fatigue failure. This position is the weakest point in the entire pilot structure.

[0080] According to the material mechanics formula, the relationship between the maximum stress of the flexible hinge and the angular displacement output of the jet tube is expressed as follows:

[0081]

[0082] σ max is the maximum stress of the flexible hinge, E is the elastic modulus of the material used in the flexible hinge structure, R is the arc cut radius of the flexible hinge, θ is the rotation angle of the flexible hinge-jet tube-feedback spring assembly, t is the minimum thickness dimension at the flexible hinge cut, s = b / t, b is the plane thickness of the flexible hinge.

[0083] The maximum stress of the flexible hinge 2 is positively correlated with the elastic modulus of the material, the square of the tangent radius, and the angular displacement of the jet tube, and is inversely proportional to the square of the thickness at its thinnest position.

[0084] According to the fatigue failure mechanism of metal materials, under the action of the alternating stress load spectrum, in order for the structure to achieve a certain service life, its maximum stress and alternating stress amplitude should be less than the corresponding stress limit. By changing the material and related dimensions of the flexible hinge, the maximum stress at the center of rotation of the flexible hinge can be reduced, and the theoretical design life of the pilot structure can be made closer to infinite.

[0085] The reliability characteristics of the present invention are described below.

[0086] The servo valve pilot structure based on the flexible hinge 2 and bilateral smart materials described in this invention utilizes mechanical hard contact, avoiding the zero-position drift caused by external environmental interference such as temperature changes, which occurs with conventional electromagnetic torque motors that rely on magnetic clearance. Furthermore, the use of bilateral drive effectively eliminates the power-off, full-rudder failure associated with unilateral actuators.

[0087] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A servo valve pilot structure based on bilateral smart materials, characterized in that: include, A base body (1), wherein the base body (1) is provided with a receiving cavity (11); A flexible hinge (2), wherein a first end of the flexible hinge (2) is fixedly connected to the base (1), and a second end is located in the accommodating cavity (11); Two actuators (3), the two actuators (3) are arranged on opposite sides of the base (1), and the actuating ends (31) of the two actuators (3) are both located in the accommodating cavity (11) and abut against the second end of the flexible hinge (2) from opposite sides; A pressure distribution member (4), one end of the pressure distribution member (4) being fixedly connected to the second end of the flexible hinge (2); the pressure distribution member (4) is used to deflect under the action of the pressure difference between the two actuators (3) to achieve state switching; The base (1) is provided with a first through hole (12) and a second through hole (13); The first through hole (12) and the second through hole (13) are both in communication with the accommodating cavity (11) and are respectively located on two opposite sides of the base body (1); the center line of the first through hole (12) and the center line of the second through hole (13) are located on the same straight line; The base (1) is further provided with a third through hole (14); The pressure distribution member (4) passes through the third through hole (14), and one end of the pressure distribution member (4) away from the flexible hinge (2) is located outside the base body (1); The center line of the first through hole (12) and the center line of the second through hole (13) are both perpendicular to the straight line where the center line of the third through hole (14) is located; One end of the actuating end (31) resting against the flexible hinge (2) is provided with a protrusion (32), and the protrusion (32) is a partial spherical structure.

2. The servo valve pilot structure based on bilateral smart materials according to claim 1 is characterized in that: The pressure distribution member (4) has at least three states: In the first state, the second end of the flexible hinge (2) deflects in a first direction under the joint action of the two actuators (3); In the second state, the second end of the flexible hinge (2) deflects in a second direction under the joint action of the two actuators (3); the first direction is opposite to the second direction; In the third state, when the second end of the flexible hinge (2) is not acted upon by the actuator (3), or is acted upon by two actuators (3) with equal magnitude and opposite directions, the second end of the flexible hinge (2) is in a balanced position between the first state and the second state.

3. The servo valve pilot structure based on bilateral smart materials according to claim 2 is characterized in that: A sealing member (5) is installed between the pressure distribution member (4) and the third through hole (14).

4. The servo valve pilot structure based on bilateral smart materials according to any one of claims 1 to 3, characterized in that: The pressure distribution component (4) is a jet tube or a baffle.

5. The servo valve pilot structure based on bilateral smart materials according to any one of claims 1 to 3, characterized in that: The actuator (3) is made of piezoelectric ceramics or giant magnetostrictive material.

6. The servo valve pilot structure based on bilateral smart materials according to any one of claims 1 to 3, characterized in that: The dimension of the flexible hinge (2) in the direction from the first end to the second end thereof, in the direction of the line connecting the two actuating ends (31), first decreases and then increases.

7. The servo valve pilot structure based on bilateral smart materials according to any one of claims 1 to 3, characterized in that: Also included is a locking nut (6); The actuator (3) is threadedly connected to the base (1); The locking nut (6) is threadedly connected to the actuator (3), and the locking nut (6) abuts against the base (1).

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