CN211288293U - Plug-in rotary direct drive electro-hydraulic servo valve - Google Patents

Abstract

The utility model provides a plug-in rotary direct-drive electro-hydraulic servo valve, which enhances the controllability of the servo motor. The valve body assembly includes a motor shaft, an upper end cover baffle, an upper end cover, an upper pressure plate, an upper valve core, a lower valve core, a valve sleeve, a lower pressure plate, and a lower end cover, and the lower outer end surface cover of the upper end cover is mounted on the upper pressure plate The upper end surface of the valve sleeve forms an upper valve core installation cavity, the lower surface of the upper pressure plate is fixedly connected to the upper annular surface of the valve sleeve, the lower valve core is arranged in the inner cavity of the valve sleeve, and the upper end cover blocks The plate cover is mounted on the upper end surface of the top plate of the upper end cover. The top plate of the upper end cover is provided with a central hole. The shaft end of the motor shaft passes through the central hole and the upper end cover baffle protrudes upward. The motor shaft The upper convex part of the motor is used to connect the output shaft of the motor, the motor shaft also includes a lower connecting end, and the center of the lower surface of the lower connecting end is concave to form a guiding center hole.

Description

Plug-in rotary direct drive electro-hydraulic servo valve

technical field

The utility model relates to the technical field of electro-hydraulic servo valve structures, in particular to a direct-insertion rotary direct-drive electro-hydraulic servo valve.

Background technique

As a key component of the electro-hydraulic servo control system, the electro-hydraulic servo valve is not only an electro-hydraulic conversion component, but also a power amplifying component. It connects the electrical part with the hydraulic part to realize the conversion and amplification of electro-hydraulic signals. It determines the performance of the entire electro-hydraulic servo control system to a certain extent, and is widely used in machinery, automobiles, ships, aviation, aerospace and robotics due to its high precision and fast response characteristics.

At present, with the expansion of the application field of electro-hydraulic servo system, the application of robot also puts forward higher requirements for electro-hydraulic servo valve: high frequency response, high reliability, strong anti-pollution ability, simple structure, small size, easy to use Convenient maintenance, low cost and easy integration, etc., traditional electro-hydraulic servo valve has been difficult to meet the above requirements.

In the application field of the plug-in rotary direct drive electro-hydraulic servo valve, it is required to have frequent starting and stopping at a small angle, and the motor with frequent starting and stopping at a small angle often does not have a large torque, so how to Reasonable arrangement of the motor in the electro-hydraulic servo valve is a technical difficulty to be overcome in this field.

SUMMARY OF THE INVENTION

In view of the above problems, the present utility model provides a direct-insertion rotary direct-drive electro-hydraulic servo valve, wherein a hydraulic amplification mechanism is designed between the actuating driver and the valve core, and the pressure of the hydraulic amplifier drives the valve core to move, Therefore, the torque requirement of the servo valve on the actuator is reduced, the volume of the actuator of the direct-drive servo valve is reduced, the response frequency of the actuator is increased, and the response frequency of the whole valve is increased, and the servo valve has a hydraulic zero position, thereby Enhance the controllability of the servo motor.

An in-line rotary direct-drive electro-hydraulic servo valve is characterized in that: it includes a motor and a valve body assembly, and the valve body assembly includes a motor shaft, an upper end cover baffle plate, an upper end cover, an upper pressure plate, an upper valve core, The lower valve core, the valve sleeve, the lower pressing plate, and the lower end cover, the lower outer end surface cover of the upper end cover is mounted on the upper end surface of the upper pressing plate to form an upper valve core installation cavity, and the lower surface of the upper The upper annular surface of the valve sleeve, the lower valve core is arranged in the inner cavity of the valve sleeve, the upper end cover baffle cover is mounted on the upper end surface of the top plate of the upper end cover, and the top plate of the upper end cover is provided There is a central hole, the shaft end of the motor shaft penetrates the central hole, and the baffle of the upper end cover protrudes upward. The upper convex part of the motor shaft is used to connect the output shaft of the motor, and the motor shaft also includes a lower connection The center of the lower surface of the lower connecting end is concave to form a guide center hole, the upper convex part of the upper valve core is positioned in the guide center hole, and the axial center part of the upper valve core passes through the valve core bolt. The upper convex connection structure of the lower valve core is fixed, the main body of the upper valve core includes two symmetrically arranged fan-shaped areas, and two sets of oil return cavities are formed in the area between the two fan-shaped areas, each of the The lower part of the central area of the fan-shaped area is provided with a concave fan-shaped groove, the radially inner end of the concave fan-shaped groove extends to the outer ring wall of the upper convex connecting structure, and the outer ring area of the inner concave fan-shaped groove is provided with There is the upper pressure plate, the upper pressure plate includes a pair of radially inwardly convex partitions, each of the radially inwardly convex partitions separates the sector area of the inwardly concave fan-shaped groove, and the radially inwardly convex partitions The radial inner wall is arranged in close contact with the outer ring wall of the upper convex connecting structure, and the radial inner convex partition evenly divides each of the inner concave fan-shaped grooves into a first oil cavity and a second oil cavity, and the valve The sleeve is provided with two groups of P ports, A ports and B ports, and the lower valve core is provided with P cavity, A cavity and B cavity corresponding to the positions of the P port, A port and B port, respectively. The lower valve core is further provided with a T cavity, and the top plate of the P cavity corresponding to the lower valve core communicates with the first oil cavity through a first throttle hole, and communicates with the second oil cavity through a second throttle hole, respectively. The upper valve core is provided with a first fan-shaped groove at the position of the top plate corresponding to the first oil chamber 22, and a second fan-shaped groove is provided at the position of the top plate corresponding to the second oil chamber 25. The position of the first fan-shaped groove is provided with a first pressure relief orifice, a position corresponding to the second fan-shaped groove is provided with a second pressure relief orifice, and the lower connecting end corresponds to the position of the oil return cavity Corresponding connecting holes are provided, and the oil return cavity is connected to the top inlet of the T cavity; the lower pressure plate has 4 fan-shaped grooves, which cooperate with the lower end cover to form 4 throttling cavities, which are two P The throttling chamber and the two T throttling chambers are arranged symmetrically about the center, the P throttling chamber communicates with the P chamber, the T throttling chamber communicates with the T chamber, and when the valve core is at zero position, the throttling chamber and A Cavity and cavity B are not connected, the combination of the lower pressure plate and the lower end cover is fixedly mounted on the lower end surface of the valve sleeve and the lower valve core, the lower valve core rotates relative to the valve sleeve, and the lower end cover corresponds to The T throttle chamber is provided with an oil return port.

It is further characterized by:

The P cavity, A cavity and B cavity of the lower spool are respectively provided with guide holes corresponding to the positions of the P port, A port and B port, and the arc of the guide hole ensures that the lower spool rotates by a corresponding angle It can still communicate with the P port, A port and B port on the corresponding valve sleeve normally;

The shaft end of the motor shaft is sleeved with a bearing, the outer ring of the bearing is arranged in close contact with the inner wall of the corresponding top plate of the upper end cover, the inner ring of the bearing is pressed against the upper end surface of the lower connecting end, and the upper The main body part of the valve core is rotatable relative to the motor shaft;

A sealing ring is installed in the gap formed after the upper end cover baffle cover is installed on the top plate of the upper end cover, and the contact end surface of the upper end cover baffle plate and the upper end cover is surrounded by a Gree ring;

The lower convex part of the central shaft of the lower valve core is positioned in the central hole of the lower end cover to ensure convenient and reliable installation;

The upper pressure plate is provided with a concave locating ring groove corresponding to the inner upper convex ring of the upper end of the valve sleeve, and the inner upper convex ring of the upper end of the valve sleeve is inserted into the inner concave locating ring groove, so that the installation is fast and convenient ,

The upper end cover baffle plate, the upper end cover, the upper pressure plate and the top of the valve sleeve are fixedly connected by the upper positioning bolts of the ring cloth;

The bottom of the lower end cover, the lower pressing plate and the valve sleeve are fixedly connected by the lower positioning bolts of the ring cloth.

After the above technical solution is adopted, a hydraulic amplifier mechanism is designed between the actuator and the valve core, which will drive the valve core to move through the pressure of the hydraulic amplifier, thereby reducing the torque requirement of the servo valve on the actuator and reducing the direct drive servo valve. The volume of the actuator increases the response frequency of the actuator and thus the response frequency of the entire valve, and enables the servo valve to have a hydraulic zero position, thereby enhancing the controllability of the servo motor.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the utility model;

Fig. 2 is the front view sectional structure schematic diagram of the utility model;

3 is a schematic diagram of the assembly structure of the upper valve core and the lower valve core of the present invention;

Fig. 4 is the A-A sectional structure schematic diagram of Fig. 3;

Fig. 5 is the B-B sectional structure schematic diagram of Fig. 3;

Fig. 6 is the C-C sectional structure schematic diagram of Fig. 3;

7 is a schematic structural diagram of a perspective view of the assembled upper valve core, upper pressure plate and lower valve core of the present invention;

8 is a schematic cross-sectional structural diagram of the upper valve core, the upper pressure plate, and the lower valve core after assembly of the present invention;

Fig. 9 is a partial enlarged structural schematic diagram at D of Fig. 8;

10 is a schematic structural diagram of a top view of the assembled lower pressure plate and lower end cover of the present invention;

Figure 11 is a three-dimensional cross-sectional structural schematic diagram of the present invention;

12 is a schematic structural diagram of a perspective view of an upper pressure plate of the present invention;

13 is a schematic structural diagram of a perspective view of the assembled upper valve core and lower valve core of the present invention;

The names corresponding to the serial numbers in the figure are as follows:

Motor 1, valve body assembly 2, motor shaft 3, shaft end 301, lower connecting end 302, guide center hole 303, first pressure relief orifice 304, second pressure relief orifice 305, connection hole 306, transition cavity Body 307, upper end cover baffle 4, upper end cover 5, top plate 51, upper pressure plate 6, radially inner convex baffle 61, inner concave positioning ring groove 62, upper valve core 7, upper convex part 71, sector area 72, return Oil chamber 73, concave fan-shaped groove 74, first oil chamber 75, second oil chamber 76, first fan-shaped groove 77, second fan-shaped groove 78, lower valve core 8, upper convex connecting structure 81, P chamber 82, A Cavity 83, B cavity 84, T cavity 85, first orifice 86, second orifice 87, central shaft lower convex portion 88, valve sleeve 9, P port 91, A port 92, B port 93, inside the upper end Upper convex ring 95, lower pressure plate 10, P throttle chamber 101, T throttle chamber 102, lower end cover 11, oil return port 111, upper valve core mounting chamber 12, valve core bolt 13, guide hole 14, bearing 15, seal Ring 16 , Gray ring 17 , upper positioning bolt 18 , lower positioning bolt 19 .

Detailed ways

A direct plug-in rotary direct drive electro-hydraulic servo valve, see Figure 1-13: it includes a motor 1, a valve body assembly 2, and the valve body assembly 2 includes a motor shaft 3, an upper end cover baffle 4, an upper end cover 5, The upper pressure plate 6, the upper valve core 7, the lower valve core 8, the valve sleeve 9, the lower pressure plate 10, the lower end cover 11, the lower outer end surface cover of the upper end cover 5 is mounted on the upper end surface of the upper pressure plate 6, forming the upper valve core installation cavity 12 , the lower surface of the upper pressure plate 10 is fixedly connected to the upper annular surface of the valve sleeve 9, the lower valve core 7 is arranged in the inner cavity of the valve sleeve 9, and the upper end cover baffle plate 4 is mounted on the upper end surface of the top plate 51 of the upper end cover 5. The top plate 51 of the cover 5 is provided with a central hole, the shaft end 301 of the motor shaft 3 passes through the central hole, and the upper end cover baffle plate 4 protrudes upward, and the upward convex part of the motor shaft 3 is used to connect the output shaft of the motor 1, the motor shaft 3 also includes a lower connecting end 302, the center of the lower surface of the lower connecting end 302 is concave to form a guide center hole 303, the upper convex part 71 of the upper valve core 7 is positioned in the guide center hole 303, and the axial center of the upper valve core 7 is arranged The upper convex connecting structure 81 of the lower spool 8 is partly fixed by the spool bolt 13. The main body of the upper spool 7 includes two symmetrically arranged fan-shaped areas 72, and two sets of loops are formed in the area between the two fan-shaped areas 72. In the oil chamber 73, a concave fan-shaped groove 74 is provided in the lower part of the central area of each fan-shaped area 72, and the radially inner end of the concave fan-shaped groove 74 extends to the outer ring wall of the upper convex connecting structure 81. The outer ring area is provided with an upper pressure plate 6, and the upper pressure plate 6 includes a pair of radially inwardly convex baffles 61. The radial inner wall is arranged in close contact with the outer ring wall of the upper convex connecting structure 81 , and the radial inner convex partition 61 evenly divides each inner concave fan-shaped groove 74 into a first oil chamber 75 and a second oil chamber 76 . There are two groups of P ports 91, A ports 92 and B ports 93. The lower valve core 8 is provided with P chambers 82, A chambers 83 and B corresponding to the positions of the P ports 91, A ports 92 and B ports 93 respectively. The lower spool 8 is also provided with a T cavity 85, the top plate of the P cavity 82 corresponding to the lower spool 8 communicates with the first oil cavity 75 through the first throttle hole 86, and the second throttle hole 87 communicates with the second cavity 84, respectively. In the oil chamber 76, a first fan-shaped groove 77 is provided on the top plate position of the upper valve core 7 corresponding to the first oil chamber 75, and a second fan-shaped groove 78 is provided on the top plate position corresponding to the second oil chamber 76. The lower part is connected in a balanced state. The position of the end 302 corresponding to the first fan-shaped groove 77 is provided with a first pressure relief orifice 304, the position corresponding to the second fan-shaped groove 78 is provided with a second pressure relief orifice 305, and the lower connecting end 302 corresponds to the return valve. The position of the oil cavity 72 is provided with a corresponding connection hole 306, and the oil return cavity 72 is connected to the top inlet of the T cavity 85; the lower pressing plate 10 is provided with 4 fan-shaped grooves, which cooperate with the lower end cover 11 to form 4 throttling cavities, respectively There are two P throttle chambers 101 and two T throttle chambers 102, which are arranged symmetrically about the center. The P throttle chamber 101 communicates with the P chamber 82, and the T throttle chamber 102 communicates with the T chamber 85. When the throttling chamber is in the zero position, there is no communication between the A chamber 83 and the B chamber 84. The assembly of the lower pressing plate 10 and the lower end cover 11 is fixed on the lower end surface of the valve sleeve 9 and the lower valve core 8, and the lower valve core 8 is opposite to the valve sleeve 9. The lower end cover 11 is provided with an oil return port 111 corresponding to the T throttle chamber 102 during the rotation operation.

The P cavity 82, A cavity 83 and B cavity 84 of the lower spool 8 are respectively provided with guide holes 14 corresponding to the positions of the P port 91, the A port 92 and the B port 83. The curvature of the guide hole 14 ensures that the lower spool rotates correspondingly. It can still communicate with the P port 91, A port 92, and B port 93 on the corresponding valve sleeve 9 after the angle of the valve sleeve 9 is normal;

The shaft end 301 of the motor shaft 3 is sleeved with the bearing 15, the outer ring of the bearing 15 is arranged in close contact with the inner wall of the corresponding top plate 51 of the upper end cover 5, the inner ring of the bearing 15 is pressed against the upper end face of the lower connecting end 302, and the upper valve core The main body part of 7 can be rotated relative to the motor shaft 3;

The gap formed after the top plate 51 of the upper end cap 5 is covered with the upper end cover baffle plate 4 is filled with the sealing ring 16, and the contact end face of the upper end cover baffle plate 4 and the upper end cap 5 is annularly clothed with the Gree ring 17;

The lower convex part 88 of the central shaft of the lower valve core 8 is positioned in the central hole of the lower end cover to ensure convenient and reliable installation;

The upper pressure plate 6 is provided with an inner concave positioning ring groove 62 corresponding to the inner upper convex ring 95 of the upper end of the valve sleeve 9, and the inner upper convex ring 95 of the upper end of the valve sleeve 9 is inserted into the inner concave positioning ring groove 62, so that the installation is fast and convenient,

The tops of the upper end cover baffle plate 4, the upper end cover 5, the upper pressure plate 6 and the valve sleeve 9 are fixedly connected by the upper positioning bolts 18 of the ring cloth;

The bottom of the lower end cover 11 , the lower pressing plate 10 and the valve sleeve 9 are fixedly connected by the lower positioning bolts 19 of the ring cloth.

It works as follows:

The high-pressure oil enters the P cavity 82 through the P port 91, and then enters the first oil cavity 75 and the second oil cavity 76 through the first throttle hole 86 and the second throttle hole 87 opened on the end face of the P cavity 82, respectively. The top plate position of the core 7 corresponding to the first oil chamber 75 is provided with a first fan-shaped groove 77, and the top plate position corresponding to the second oil chamber 76 is provided with a second fan-shaped groove 78. A first pressure relief orifice 304 is provided at the position of a fan-shaped groove 77, and a second pressure relief orifice 305 is provided corresponding to the position 78 of the second fan-shaped groove, so that the first oil chamber 75 passes through the first fan-shaped groove 77, The first pressure relief orifice 304 enters the transition cavity 307, then passes into the oil return cavity 73 and the T cavity 85 through the connecting hole 306, and then enters the T throttle cavity 102 and is discharged from the oil return port 111; The oil cavity 76 enters the transition cavity 307 through the second fan-shaped groove 78 and the second pressure relief orifice 305 , and then enters the oil return cavity 73 and the T cavity 85 through the connecting hole 306 , and then enters the T throttle cavity 102 . Discharge from the oil return port 111;

The circular through holes on the motor shaft, the first pressure relief orifice 304 and the second pressure relief orifice 305, partially cover the first fan-shaped groove 77 and the second fan-shaped groove 78 at the corresponding positions. When the motor shaft rotates in a small amount , the covered area of the fan-shaped groove will change, thereby changing the flow area of the first pressure relief orifice 304 and the second pressure relief orifice 305, thereby changing the first oil chamber 75 and the second oil chamber 76 When the valve core is at the zero position, the flow areas of the first pressure relief orifice 304 and the second pressure relief orifice 305 are equal, and the pressures of the two first oil chambers 75 and the second oil chamber 76 are equal, and they are in equilibrium. Location.

When the motor 1 drives the motor shaft 3 to rotate in the forward direction by an angle, the area of the through hole in the first pressure relief orifice 304 decreases, and the area of the through hole in the second pressure relief orifice 305 increases, resulting in the first pressure relief orifice 305. The pressure of the first oil chamber 75 increases, and the pressure of the second oil chamber 76 decreases. At this time, since the pressure of the first oil chamber 75 is higher than the pressure of the second oil chamber 76, the valve core will be affected by the combined action of the two oil chambers. A counterclockwise pressure moment causes the valve core to rotate counterclockwise until the flow areas of the first pressure relief orifice 304 and the second pressure relief orifice 305 return to equal, and the pressures of the two oil chambers reach a new pressure balance until. When the valve core rotates counterclockwise, the P throttle chamber 101 communicates with the A chamber 83 , and the T throttle chamber 102 communicates with the B chamber 84 . Conversely, when the motor 1 rotates in the opposite direction, the area of the through hole in the first pressure relief orifice 304 increases, and the area of the through hole in the second pressure relief orifice 305 decreases, thereby causing the first oil The pressure of the cavity 75 decreases and the pressure of the second oil cavity 76 increases. At this time, since the pressure of the first oil cavity 75 is lower than the pressure of the second oil cavity 76, the valve core will be subjected to a clockwise rotation under the combined action of the two oil cavities. The spool will rotate clockwise until the flow areas of the first pressure relief orifice 304 and the second pressure relief orifice 305 return to equal, and the pressures of the two oil chambers reach a new pressure balance. When the valve core rotates clockwise, the P throttle chamber 101 communicates with the B chamber 84 , and the T throttle chamber 102 communicates with the A chamber 83 .

The torque balance of the servo valve is realized by the integral throttle cavity formed by the combination of the upper spool and the lower spool, thereby reducing the power demand for the motor, thereby reducing the volume of the motor, increasing the response frequency of the driver and improving the The bandwidth of the servo valve.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. A rotatory electrohydraulic servo valve that directly drives of cartridge formula all the time, its characterized in that: the valve body assembly comprises a motor and a valve body assembly, wherein the valve body assembly comprises a motor shaft, an upper end cover baffle, an upper end cover, an upper pressure plate, an upper valve core, a lower valve core, a valve sleeve, a lower pressure plate and a lower end cover, the outer end surface of the lower part of the upper end cover is covered on the upper end surface of the upper pressure plate to form an upper valve core mounting cavity, the lower surface of the upper pressure plate is fixedly connected with the upper ring surface of the valve sleeve, the lower valve core is arranged in the inner cavity of the valve sleeve, the upper end cover baffle is covered on the upper end surface of the top plate of the upper end cover, a central hole is formed in the top plate of the upper end cover, the shaft end of the motor shaft penetrates through the central hole and protrudes upwards from the upper end cover baffle, the protruding part of the motor shaft is used for connecting with an output shaft of the motor, the motor shaft further comprises a lower connecting end, the axial center part of the upper valve core is fixedly connected with the upper convex connecting structure of the lower valve core through a valve core bolt, the main body part of the upper valve core comprises two symmetrically arranged fan-shaped areas, two groups of oil return cavities are formed in the surface area between the two fan-shaped areas, the lower part of the center area of each fan-shaped area is provided with an inner concave fan-shaped groove, the radial inner end of each inner concave fan-shaped groove extends to the outer ring wall of the upper convex connecting structure, the outer ring area of each inner concave fan-shaped groove is provided with the upper pressure plate, each upper pressure plate comprises a pair of radial inner convex baffles, each radial inner convex baffle separates the fan-shaped area of each inner concave fan-shaped groove, the radial inner walls of the radial inner convex baffles are arranged in a mode of clinging to the outer ring wall of the upper convex connecting structure, each radial inner concave fan-shaped groove is uniformly divided into a first oil cavity and a, The positions of the lower valve core corresponding to the port P, the port A and the port B are respectively and correspondingly provided with a cavity P, a cavity A and a cavity B, the lower valve core is also provided with a T cavity, a top plate of the P cavity corresponding to the lower valve core is communicated with the first oil cavity through a first throttling hole and communicated with the second oil cavity through a second throttling hole respectively, a first fan-shaped groove is formed in the position, corresponding to the top plate of the first oil cavity 22, of the upper valve core, a second fan-shaped groove is formed in the position, corresponding to the top plate of the second oil cavity 25, of the upper valve core, a first pressure relief throttling hole is formed in the position, corresponding to the first fan-shaped groove, of the lower connecting end in a balanced state, a second pressure relief throttling hole is formed in the position, corresponding to the second fan-shaped groove, of the lower connecting end, a corresponding connecting hole is formed in the position, corresponding to the oil return cavity, of the lower connecting end, and the oil return cavity is communicated with a top inlet of the T cavity; the lower pressing plate is provided with 4 fan-shaped grooves, 4 throttling cavities are formed by matching with the lower end cover and are respectively two P throttling cavities and two T throttling cavities, the P throttling cavities and the P cavities are symmetrically arranged in pairs about the center, the T throttling cavities are communicated with the T cavities, the throttling cavities are not communicated with the cavity A and the cavity B when the valve core is in a zero position, a combined piece of the lower pressing plate and the lower end cover is fixedly arranged on the lower end faces of the valve sleeve and the lower valve core, the lower valve core rotates relative to the valve sleeve, and the lower end cover is provided with an oil return port corresponding to the T throttling cavities.

2. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the positions of the P cavity, the A cavity and the B cavity of the lower valve core, which correspond to the P port, the A port and the B port, are respectively provided with a guide hole, and the radian of the guide holes ensures that the lower valve core can still be normally communicated with the P port, the A port and the B port on the corresponding valve sleeve after rotating by a corresponding angle.

3. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 2, wherein: the motor shaft is characterized in that a bearing is sleeved at the shaft end of the motor shaft, the outer ring of the bearing is arranged to be clung to the inner wall of the corresponding top plate of the upper end cover, and the inner ring of the bearing is pressed on the upper end face of the lower connecting end.

4. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: and a sealing ring is plugged in a gap formed by covering the upper end cover baffle on the top plate of the upper end cover, and GREEN rings are annularly distributed on the contact end surface of the upper end cover baffle and the upper end cover.

5. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the lower part of the central shaft of the lower valve core is positioned in the central hole of the lower end cover.

6. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the upper pressure plate is provided with a concave positioning ring groove corresponding to the upper inner convex ring of the upper end of the valve sleeve, and the upper inner convex ring of the upper end of the valve sleeve is inserted in the concave positioning ring groove.

7. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the upper end cover baffle, the upper end cover, the upper pressure plate and the top of the valve sleeve are fixedly connected through upper positioning bolts distributed annularly.

8. The direct-plug-in rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the lower end cover, the lower pressure plate and the bottom of the valve sleeve are fixedly connected through lower positioning bolts which are annularly distributed.

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