Servo valve

Abstract

The invention discloses a servo valve and relates to the technical field of servo valves, the servo valve comprises a shell, a valve body, a servo motor and a damping assembly, the shell is hollow and defines a containing cavity, the valve body comprises a base installed with the shell in a matched mode, at least one part of the valve body is contained in the containing cavity, and a valve element is arranged in the valve body; the damping assembly comprises a damping support contained in the containing cavity and installed on the base and a valve sleeve arranged in the valve body and arranged on the outer surface of the valve element in a sleeving mode, and the outer surface of the valve sleeve abuts against the inner surface of the valve body. The design of the damping assembly can help to reduce the external force of impact or vibration, the external force is transmitted to the valve body or even the valve element wrapped by the valve sleeve after being buffered, the influence of the external force on the whole structure is smaller, the position of the valve body is stabilized, control errors are reduced, and therefore the precision of the servo valve is guaranteed, the reliability is further guaranteed, and the service life of the servo valve is prolonged. The dynamic response performance of the servo valve is optimized, and the overall efficiency of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of servo valves, and in particular to a servo valve. Background Art

[0002] The servo valve is an important basic hydraulic component widely used in various precision control systems. Its main function is to convert low-power input electrical signals into accurate, fast, high-power liquid flow or pressure output to achieve efficient control of the system. It plays a key role in the fields of aerospace, mechanical manufacturing and industrial automation, and is mainly used to accurately control the flow of fluids. The key to the design of servo valves lies in their stability and reliability, especially in high-vibration and high-load environments. In the operation of traditional servo valves, affected by the working environment, the valve body may be affected by external factors such as vibration and impact. This type of external factors is not buffered and is directly transmitted to the precision structure inside the valve body, thereby affecting the accuracy and reliability of the servo valve. Summary of the invention

[0003] The main purpose of the present invention is to provide a servo valve, aiming to reduce the influence of external vibration, improve the accuracy of the servo valve and enhance the reliability.

[0004] To achieve the above-mentioned purpose, the servo valve proposed in the present invention includes a housing, a valve body, a servo motor and a shock-absorbing assembly. The housing is hollow and defines a receiving chamber. The valve body includes a base adapted to be mounted on the housing and at least a part of the valve body is received in the receiving chamber. A valve core is arranged inside the valve body. The shock-absorbing assembly includes a shock-absorbing bracket received in the receiving chamber and mounted on the base, and a valve sleeve arranged in the valve body and sleeved on the outer surface of the valve core, and the outer surface of the valve sleeve abuts against the inner surface of the valve body. Compared with the traditional structure, the design of the shock-absorbing assembly can help reduce the external force of impact or vibration, which is transmitted to the valve body or even the valve core covered by the valve sleeve after buffering, so that the overall structure is less affected by the external force, and the stable position of the valve body helps to reduce the control error, thereby ensuring the accuracy of the servo valve, further ensuring the reliability, optimizing the dynamic response performance of the servo valve, and improving the overall efficiency of the system. In addition, the shock-absorbing assembly can effectively reduce the displacement and impact of the valve body, reduce mechanical wear and fatigue, and increase the service life of the valve.

[0005] In some embodiments, the shock-absorbing bracket is hollowed out and has an open end, the open end is connected to the base and defines a cavity with the base; at least a portion of the valve body is accommodated in the cavity and extends out of the cavity through the hollowed-out portion. The shock-absorbing bracket can be installed on the base, semi-surrounding the valve body, providing a layer of protection for the valve body, thereby improving the safety performance of the servo valve, and the hollowed-out portion does not affect the connection between the valve body and other structures, making it convenient to use.

[0006] In some embodiments, a mounting groove and / or a fixing groove is provided around the hollow part on one side of the shock-absorbing bracket away from the base, the fixing groove is used to assist in fixing the shock-absorbing bracket on the base, and the mounting groove is used to install other structures on the shock-absorbing bracket. The fixing groove assists in fixing the shock-absorbing bracket 141 on the base, improves the installation stability of the shock-absorbing bracket 141, and the mounting groove can fix other structures on the shock-absorbing bracket, reduces the complexity of the structure, and increases the counterweight of the shock-absorbing bracket, thereby further enhancing the shock-absorbing effect of the shock-absorbing bracket.

[0007] In some embodiments, a protrusion is provided on the outer surface of the valve core, and at least one group of annular grooves are provided at opposite ends of the outer wall of the valve sleeve, and at least three pairs of abutment holes are provided in each annular groove to connect the inner and outer walls of the valve sleeve, and the abutment holes are provided corresponding to the protrusions of the inner wall of the valve body or the valve core and can be abutted and matched with the protrusions. The valve sleeve is provided between the valve body and the valve core to reduce the effect of external forces such as vibration or impact on the valve core, and the annular groove of the valve sleeve can reduce the contact area with the inner wall of the valve body, and the abutment holes provided in the annular groove are abutted and matched with the protrusions formed on the outer surface of the valve core to form a bite structure. When affected by vibration or impact, the transmission of force can be weakened by controlling the tightness of the bite, thereby better playing a shock-absorbing role for the valve core; in addition, it can also reduce mechanical wear and fatigue, and increase the service life of the valve core and the valve body.

[0008] In some embodiments, the number of annular grooves is 5, the number of abutment holes in each annular groove is 4 pairs, and the valve sleeve of the servo valve is centrally symmetrical as a whole. The number of annular grooves directly affects the contact area between the valve sleeve and the inner wall of the valve body, and the number of abutment holes directly affects the connection stability between the valve sleeve and the valve core. While reducing the contact area, it is also necessary to ensure sufficient connection stability. The valve sleeve is centrally symmetrical as a whole for easy use and installation.

[0009] In some embodiments, the servo valve further comprises a servo motor, at least one limiting groove is formed on the outer surface of the servo motor, and limiting teeth are provided at the hollow portion of the shock absorbing bracket corresponding to the limiting groove. The limiting groove of the servo motor cooperates with the limiting teeth of the shock absorbing bracket to limit the rotation of the servo motor when they are engaged with each other, thereby fixing the stator position of the servo motor.

[0010] In some embodiments, the valve body surrounds at least a portion of the servo motor, and a limit structure for limiting the rotation angle of the servo motor is provided on the inner wall of the valve body corresponding to the servo motor. By setting the limit structure, the rotation angle of the servo motor rotor is controlled, thereby finely controlling the rotation angle of the servo motor.

[0011] The technical solution of the present invention reduces the impact of vibration on the internal components of the servo valve by arranging a shock-absorbing assembly inside the servo valve, ensuring that the valve remains stable under extreme conditions, thereby improving the reliability of the entire system, and can effectively reduce the displacement and impact of the valve body, reduce mechanical wear and fatigue, and increase the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0013] Figure 1 A schematic diagram of the three-dimensional structure of a servo valve according to an embodiment of the present invention; Figure 2 An exploded view of the structure of another embodiment of the servo valve provided by the present invention; Figure 3 A top view of a shock-absorbing bracket in another embodiment of a servo valve provided by the present invention; Figure 4 A schematic diagram of the three-dimensional structure of a shock-absorbing bracket in another embodiment of the servo valve provided by the present invention; Figure 5 An exploded view of the structure of a valve body in another embodiment of the servo valve provided by the present invention; Figure 6 A structural cross-sectional view of a valve body in yet another embodiment of a servo valve provided by the present invention.

[0014] Description of Figure Numbers: 100, servo valve; 11, housing; 12, valve body; 13, servo motor; 14, shock absorbing assembly; 15, accommodating chamber; 16, chamber; 121, valve core; 122, limiting structure; 123, base; 131, limiting groove; 132, stator; 133, rotor; 141, shock-absorbing bracket; 142, valve sleeve; 1211, protrusion; 1411, installation groove; 1412, fixing groove; 1413, limiting tooth; 1414, first hollow part; 1415, second hollow part; 1421, first annular groove; 1422, third annular groove; 1423, abutting hole; The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. Unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0017] In addition, if there are descriptions of "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. Moreover, the terms "include", "comprise", or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article, or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method, article, or device including the elements. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0018] During the operation of traditional servo valves, affected by the working environment, the valve body may be affected by external factors such as vibration and impact. These external factors are not buffered and are directly transmitted to the precision structure inside the valve body, thus affecting the accuracy and reliability of the servo valve.

[0019] Please combine Figure 1-Figure 2 The present invention proposes a servo valve 100, including a shell 11, a valve body 12, a servo motor 13 and a shock absorbing assembly 14. The shell 11 is hollow and defines a accommodating chamber 15. The valve body 12 includes a base 123 adapted to be mounted on the shell 11, and at least a portion of the valve body 12 is accommodated in the accommodating chamber 15. A valve core 121 is arranged inside the valve body 12 of the servo valve 100. The shock absorbing assembly 14 includes a shock absorbing bracket 141 accommodated in the accommodating chamber 15 and mounted on the base 123, and a valve sleeve 142 arranged in the valve body 12 and sleeved on the outer surface of the valve core 121, and the outer surface of the valve sleeve 142 abuts against the inner surface of the valve body 12.

[0020] It should be noted that in the specific implementation of the present invention, the shell 11 and the base 123, and the shock-absorbing bracket 141 and the base 123 are all detachably connected, and when the shell 11 and the shock-absorbing bracket 141 are installed at the same time, a gap is left between the two and they will not directly contact each other, so that the shell 11 and the shock-absorbing bracket 141 will not collide under the influence of external force.

[0021] It can be understood that, compared with traditional structures, the design of the shock absorbing assembly 14 can help reduce the external force of impact or vibration, which is transmitted to the valve body 12 or even the valve core 121 covered by the valve sleeve 142 after buffering, so that the overall structure is less affected by external forces. Stabilizing the position of the valve body 12 helps to reduce control errors, thereby ensuring the accuracy of the servo valve 100, further ensuring reliability, optimizing the dynamic response performance of the servo valve 100, and improving the overall efficiency of the system; in addition, the shock absorbing assembly 14 can effectively reduce the displacement and impact of the valve body 12, reduce mechanical wear and fatigue, and increase the service life of the valve.

[0022] In addition, when the shock-absorbing bracket 141 provides shock absorption for the valve body 12, the semi-enclosed structure also provides certain physical protection for the valve body 12, playing a certain protective function of the shell 11. Therefore, in some embodiments, when the shock-absorbing bracket 141 is installed, the position of the valve body 12 in the servo valve 100 is allowed to be fine-tuned, thereby ensuring that the valve body 12 works in the optimal position. In the process of overall performance testing of the servo valve 100, in order to simplify the debugging process and improve the testing efficiency, only the shock-absorbing bracket 141 can be installed without installing the shell 11, so as to debug the overall dynamic and static performance and performance of the servo valve 100 and replace components, which greatly simplifies the installation process and reduces the difficulty of operation.

[0023] In one embodiment, the shock-absorbing bracket 141 is hollow and has an open end, the open end is connected to the base 123 and defines a cavity 16 with the base 123; at least a portion of the valve body 12 is accommodated in the cavity 16 and extends out of the cavity 16 through the hollow portion.

[0024] It should be noted that the servo valve 100 also includes a servo motor 13, one end of the servo motor 13 penetrates into the servo valve 100 for operation, and is connected to the interior of the valve body 12 through the motor's rotor 133. Therefore, there are two hollowed-out parts on the shock-absorbing bracket 141 corresponding to the valve body 12, namely the main body of the valve body 12 and the connecting end of the valve body 12 connected to one end of the servo motor 13. Therefore, the hollow structure of the shock-absorbing bracket 141 is not limited here. The two hollowed-out parts can be formed separately or the hollowed-out parts can be formed as a whole, so that the end of the shock-absorbing bracket 141 away from the base 123 is hollow for the valve body 12 to extend out and connect with the motor, and surround the valve body 12 on all sides.

[0025] Specifically, in a specific embodiment of the present invention, there are two hollow portions at one end of the shock-absorbing bracket 141 away from the base 123, and both are roughly circular to facilitate the extension of the valve body 12. One of the hollow portions does not form a closed loop to accommodate the main body of the valve body 12, so as to be suitable for valve bodies 12 of different sizes.

[0026] It can be understood that the shock-absorbing bracket 141 can be installed on the base 123, semi-surrounding the valve body 12, constructing a layer of protection for the valve body 12, improving the safety performance of the servo valve 100, and the hollow part does not affect the connection between the valve body 12 and other structures, and is easy to use.

[0027] Please combine Figure 2-Figure 4 In one embodiment, a mounting groove 1411 and / or a fixing groove 1412 is provided around the hollow portion on one side of the shock absorbing bracket 141 away from the base 123 . The fixing groove 1412 is used to assist in fixing the shock absorbing bracket 141 on the base 123 , and the mounting groove 1411 is used to install other structures on the shock absorbing bracket 141 .

[0028] It should be noted that there are more than one mounting grooves 1411 and fixing grooves 1412. The hollow portion through which the main body of the valve body 12 passes is defined as the first hollow portion 1414, and the hollow portion through which the connecting end of the valve body 12 connected to one end of the motor passes is defined as the second hollow portion 1415. Specifically, the first hollow portion 1414 is parallel to the second hollow portion 1415, and the fixing grooves 1412 are alternately arranged around the two hollow portions to facilitate a more secure installation of the shock-absorbing bracket 141. The mounting grooves 1411 are arranged around the first hollow portion 1414 to install other structures on the shock-absorbing bracket 141.

[0029] It can be understood that the fixing groove 1412 assists in fixing the shock-absorbing bracket 141 on the base 123, thereby improving the installation stability of the shock-absorbing bracket. The installation groove 1411 can fix other structures on the shock-absorbing bracket 141, thereby reducing the structural complexity and increasing the counterweight of the shock-absorbing bracket 141, thereby further enhancing the shock-absorbing effect of the shock-absorbing bracket 141.

[0030] Specifically, in a specific embodiment of the present invention, a servo motor for driving the servo motor 13 to rotate is provided at the second hollow portion 1415 on the shock absorbing bracket 141. The servo motor is connected to a circuit board and is installed on the shock absorbing bracket 141 through the circuit board. An angular displacement sensor is provided on the circuit board.

[0031] Optionally, types of angular displacement sensors include, but are not limited to, capacitive encoders, photoelectric encoders, magnetic encoders, Hall sensors, inductive sensors, resistive sensors, micro-electromechanical system sensors, and laser sensors.

[0032] Please combine Figure 2 , Figure 5 and Figure 6 In one embodiment, the outer surface of the valve core 121 is provided with a protrusion 1211, and at least one group of annular grooves are opened at the opposite ends of the outer wall of the valve sleeve 142, and each annular groove is provided with at least three pairs of abutment holes 1423 connecting the inner and outer side walls of the valve sleeve 142. The valve sleeve 142 of the servo valve 100 is overall centrally symmetrical, and the abutment holes 1423 are arranged corresponding to the protrusions 1211 of the inner wall of the valve body 12 or the valve core 121 and can be abutted and adapted with the protrusions 1211.

[0033] Optionally, 1-3 groups of annular grooves are provided at opposite ends of the outer wall of the valve sleeve 142, all of which have the same size and depth, and each annular groove is provided with 3-6 pairs of abutment holes 1423 connecting the inner and outer side walls of the valve sleeve 142, and the abutment holes 1423 are regularly arranged in each annular groove.

[0034] It should be noted that in order to make the valve sleeve 142 as a whole centrally symmetrical and easy to use, the number of annular grooves can be odd, and the number of supporting holes 1423 in each annular groove can also be odd, as long as the central symmetry requirements can be met, and there is no restriction here.

[0035] In one embodiment, the number of the annular grooves on the outer surface of the valve sleeve 142 is 5, the number of the abutment holes 1423 in each annular groove is 4 pairs, and the valve sleeve 142 of the servo valve 100 is centrally symmetrical as a whole.

[0036] It should be noted that the number of annular grooves directly affects the contact area between the valve sleeve 142 and the inner wall of the valve body 12, and the number of abutment holes 1423 directly affects the connection stability between the valve sleeve 142 and the valve core 121. While reducing the contact area, it is also necessary to ensure sufficient connection stability. The valve sleeve 142 is overall centrally symmetrical, so there is no need to distinguish between the front and back during installation, which is convenient for use and installation.

[0037] Specifically, the annular grooves from one end to the other end of the valve sleeve 142 are respectively defined as the first annular groove 1421 to the fifth annular groove, wherein the abutment hole 1423 opened in the third annular groove 1422 is circular, and the abutment holes 1423 opened in the other annular grooves are all square holes.

[0038] It should be noted that the existing additively manufactured valve body 12 does not have a valve sleeve 142, and the additively manufactured square hole has poor control edge size and straightness accuracy, resulting in poor zero-position performance of the servo valve 100. The valve sleeve 142 is added inside the additively manufactured valve body 12, and the square hole on the valve sleeve 142 can well ensure the static performance of the valve, especially the flow gain, leakage and symmetry near the small signal zero position. After adding the annular groove, the valve sleeve 142 and the valve body 12 do not need to locate the square hole or the circular hole position when assembled. The valve sleeve 142 is designed to be centrally symmetrical, and there is no need to distinguish between the front and the back, which reduces the difficulty of assembly.

[0039] Specifically, the cross section of the valve sleeve 142 is also a centrally symmetrical figure, and the maximum inner diameter of the valve sleeve 142 is 1-60 mm.

[0040] Optionally, the maximum inner diameter of the valve sleeve 142 may be 1 mm, 3 mm, 3.5 mm, 8 mm, 15 mm, 26.3 mm, 30 mm, or 60 mm.

[0041] Preferably, the cross-sectional area of ​​the valve sleeve 142 is a circular ring, and the maximum inner diameter of the valve sleeve 142, that is, the maximum inner diameter of the circular ring, is 3-30 mm. The valve core 121 is enclosed in the valve sleeve 142 and is supported by the protrusion 1211. The valve sleeve 142 is supported by the protrusion 1211 on the inner wall of the valve body 12 through the supporting hole 1423 to form a fixed position.

[0042] It can be understood that the valve sleeve 142 is arranged between the valve body 12 and the valve core 121 to reduce the effect of external forces such as vibration or impact on the valve core 121, and the annular groove of the valve sleeve 142 can reduce the contact area with the inner wall of the valve body 12, and the abutting hole 1423 opened in the annular groove abuts against the protrusion 1211 formed on the outer surface of the valve core 121 to form a bite structure. When affected by vibration or impact, the transmission of force can be weakened by controlling the tightness of the bite, thereby better playing a shock-absorbing role for the valve core 121; In addition, the engagement structure between the supporting hole 1423 and the protrusion 1211 can also reduce mechanical wear and fatigue, thereby increasing the service life of the valve core 121 and the valve body 12 .

[0043] Please combine Figure 2-Figure 3 In some embodiments, at least one limiting groove 131 is formed on the outer surface of the servo motor 13 , and a limiting tooth 1413 is provided at the second hollow portion of the shock absorbing bracket 141 corresponding to the limiting groove 131 .

[0044] It should be noted that the servo motor 13 includes a stator 132 and a rotor 133, and the stator 132 and the rotor 133 are connected by high-precision bearings. Specifically, the rotor 133 works deep inside the valve body 12 to control the servo motor 13 to rotate, while the stator 132 needs to be fixed. The two need to be used in combination to achieve precise rotation angle control of the servo motor 13.

[0045] Specifically, the limiting groove 131 of the servo motor 13 cooperates with the limiting teeth 1413 of the shock-absorbing bracket 141 , and when they are engaged with each other, they can limit the rotation of the servo motor 13 , thereby fixing the position of the stator 132 of the servo motor 13 .

[0046] Please combine Figure 2 and Figure 6 In one embodiment, the valve body 12 surrounds at least a portion of the servo motor 13 , and a limiting structure 122 for limiting the rotation angle of the servo motor 13 is provided on the inner wall of the valve body 12 corresponding to the servo motor 13 .

[0047] It should be noted that the limiting structure 122 is used in conjunction with the structure of the servo motor 13 extending into the valve body 12 to control the rotation angle of the rotor 133 of the servo motor 13, thereby finely controlling the rotation angle of the servo motor 13.

[0048] In one embodiment, the rotation angle range of the servo motor 13 is 1-220°.

[0049] Optionally, the rotation angle range of the servo motor 13 can be 1°, 1.5°, 10°, 20°, 50°, 100°, 180°, 200°, or even 220°.

[0050] Preferably, in a specific embodiment of the present invention, the rotation angle range of the servo motor 13 is 50°-180°.

[0051] In high-demand environments such as aerospace, the reliability of servo valves is crucial. In combination with the above implementation methods, it can be seen that the technical solution of the present invention reduces the impact of vibration on the internal components of the servo valve by arranging a shock-absorbing assembly inside the servo valve, ensuring that the valve remains stable under extreme conditions, thereby improving the reliability of the entire system, and can effectively reduce the displacement and impact of the valve body, reduce mechanical wear and fatigue, and increase the service life of the valve; in addition, the stable valve body position helps to reduce control errors, optimize the dynamic response performance of the servo valve, and improve the overall efficiency of the system.

[0052] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A servo valve, characterized in that: It includes a shell, a valve body, a servo motor and a shock absorbing assembly, wherein the shell is hollow and defines a receiving cavity, the valve body includes a base adapted to be mounted on the shell and at least a part of the valve body is received in the receiving cavity, and a valve core is arranged inside the valve body; The shock absorbing assembly includes a shock absorbing bracket accommodated in the accommodating cavity and installed on the base, and a valve sleeve arranged in the valve body and sleeved on the outer surface of the valve core, wherein the outer surface of the valve sleeve abuts against the inner surface of the valve body.

2. The servo valve according to claim 1, characterized in that: The shock-absorbing bracket is hollow and has an open end, the open end is connected to the base and defines a cavity with the base; at least a portion of the valve body is accommodated in the cavity and extends out of the cavity through the hollow portion.

3. The servo valve according to claim 2, characterized in that: A mounting groove and / or a fixing groove is provided around the hollow portion on one side of the shock absorbing bracket away from the base. The fixing groove is used to assist in fixing the shock absorbing bracket on the base, and the mounting groove is used to install other structures on the shock absorbing bracket.

4. The servo valve according to claim 1, characterized in that: The cross section of the valve sleeve is a centrally symmetrical figure, and the maximum inner diameter of the valve sleeve is 1-60 mm.

5. The servo valve according to claim 1, characterized in that: A protrusion is arranged on the outer surface of the valve core, and at least one group of annular grooves are provided at opposite ends of the outer side wall of the valve sleeve. Each annular groove is provided with at least three pairs of abutment holes connecting the inner and outer side walls of the valve sleeve. The abutment holes correspond to the protrusions of the inner wall of the valve body or the valve core and can be abutted and adapted with the protrusions.

6. The servo valve according to claim 5, characterized in that: The number of the annular grooves is 5, the number of the abutment holes in each annular groove is 4 pairs, and the valve sleeve of the servo valve is centrally symmetrical as a whole.

7. The servo valve according to claim 6, characterized in that: The abutting hole in the third annular groove of the annular grooves is circular, and the abutting holes in the other annular grooves are all square holes.

8. The servo valve according to claim 2, characterized in that: The servo valve further comprises a servo motor, the outer surface of the servo motor is provided with at least one limiting groove, and the hollowed-out portion of the shock-absorbing bracket is provided with limiting teeth corresponding to the limiting groove.

9. The servo valve according to claim 8, characterized in that: The valve body surrounds at least a portion of the servo motor, and an inner side wall of the valve body is provided with a limiting structure corresponding to the servo motor for limiting the rotation angle of the servo motor.

10. The servo valve according to claim 9, characterized in that: The rotation angle range of the servo motor is 1-220°.

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