CN209781323U - Thread cartridge type rotary direct-drive electro-hydraulic servo valve - Google Patents
Thread cartridge type rotary direct-drive electro-hydraulic servo valve Download PDFInfo
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- CN209781323U CN209781323U CN201920213767.0U CN201920213767U CN209781323U CN 209781323 U CN209781323 U CN 209781323U CN 201920213767 U CN201920213767 U CN 201920213767U CN 209781323 U CN209781323 U CN 209781323U
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Abstract
the utility model provides a rotatory electrohydraulic servo valve that directly drives of screw thread cartridge formula, its internal leakage that has reduced the valve body especially has reduced the leakage rate that lets out of terminal surface, has improved power efficiency. The valve comprises a direct-current brushless servo motor and a valve body assembly, wherein the valve body assembly comprises a valve core, a valve sleeve, an upper end cover and a lower end cover, an output shaft of the direct-current brushless servo motor is connected with an upward protruding part of a central shaft of the valve core, the direct-current brushless servo motor is fixedly arranged at the upper end of the upper end cover, the valve core is arranged in an inner cavity of the valve sleeve, external threads are arranged on the peripheral surface of an outer ring of the upper end cover and used for being connected with an integrated valve block in an installing mode, and the bottom of the valve core is arranged in a central positioning hole of the lower end cover.
Description
Technical Field
The utility model relates to a technical field of electrohydraulic servo valve specifically is rotatory directly driving electrohydraulic servo valve of screw thread cartridge formula.
background
The electro-hydraulic servo valve is used as a key element of an electro-hydraulic servo control system, is an electro-hydraulic conversion element and a power amplification element, connects an electric part with a hydraulic part to realize the conversion and amplification of electro-hydraulic signals, and the performance of the electro-hydraulic servo valve determines the performance of the whole electro-hydraulic servo control system to a great extent.
at present, along with the widening of the application field of the electro-hydraulic servo system, the application occasions of the robot also put forward higher requirements on the electro-hydraulic servo valve: the traditional electro-hydraulic servo valve has the defects that the traditional electro-hydraulic servo valve cannot meet the requirements again, the main stream micro electro-hydraulic servo valve products in the market are Moog 30 series, E024 series and 242 which are complex to install, and the service life of the internal elastic element of the existing electro-hydraulic servo valve cannot meet the application occasions of robots.
therefore, in the field of robots, an electro-hydraulic servo valve with high frequency response, which is small in size, light in weight, convenient to integrate and extremely reliable in service life, especially a threaded cartridge type rotary direct-drive electro-hydraulic servo valve, is urgently needed to be developed. The direct-current servo motor is required to have a small-angle frequent start-stop function in the application field of the threaded plug-in type rotary direct-drive electro-hydraulic servo valve, and the application also belongs to the application of the direct-current servo motor in a follow-up system for frequent start-stop. The existing threaded cartridge type rotary direct-drive electro-hydraulic servo valve has the problem of large end face leakage.
disclosure of Invention
To the above problem, the utility model provides a rotatory electrohydraulic servo valve that directly drives of screw thread cartridge formula, its interior volume of letting out that has reduced the valve body has especially reduced the leakage volume that lets out of terminal surface, has improved power efficiency.
The technical scheme is that the threaded cartridge type rotary direct-drive electro-hydraulic servo valve comprises the following steps: the valve comprises a direct current brushless servo motor and a valve body assembly, wherein the valve body assembly comprises a valve core, a valve sleeve, an upper end cover and a lower end cover, an output shaft of the direct current brushless servo motor is connected with an upward convex part of a central shaft of the valve core, the direct current brushless servo motor is fixedly arranged at the upper end of the upper end cover, the valve core is arranged in an inner cavity of the valve sleeve, external threads are arranged on the peripheral surface of an outer ring of the upper end cover and are used for being connected with an integrated valve block in an installing manner, and the bottom of the valve core is arranged in a central positioning hole of the lower end cover, and the valve body assembly is characterized in that a P port, a T port, an A port and a B port which are externally communicated with the inner cavity are arranged on the valve sleeve, the P port, the T port, the A port and the B port are respectively arranged on different height planes of the valve sleeve, the valve core switching oil way structure is characterized by comprising a cavity A and a cavity B, wherein the cavity A and the cavity B are arranged at different circumferential angle positions on the same plane of the circumference of the inner wall of the valve sleeve, the outer wall of the valve core is provided with a valve core switching oil way structure, the valve core switching oil way structure is composed of a plurality of groove bodies or cavities which are recessed in the outer surface of the valve core, and the valve core switching oil way meets the following conditions: when the servo valve is in a zero position, the port P, the port A, the port B and the port T are isolated from each other; when the valve core is in a working state, the port P is communicated with the port A or the port B through the valve core switching oil way, the port T is communicated with the port B or the port A through the valve core switching oil way, and the port P and the port T are not communicated with the port A or the port B at the same time.
it is further characterized in that:
the periphery of the outer wall of the valve core is provided with two groups of symmetrically arranged oil circuit structures, each group of oil circuit structure comprises a P cavity, a T cavity, an A groove and a B groove, the corresponding positions of the outer wall of the valve core are respectively provided with the inward concave P cavity, T cavity, A groove and B groove, the height direction of the P cavity covers the horizontal plane of the P port and the horizontal plane of the A cavity, the P cavity is connected with the P port and the A cavity, the height direction of the T cavity covers the horizontal plane of the T port and the horizontal plane of the B cavity, the T cavity is connected with the T port and the B cavity, the height direction of the A groove covers the horizontal plane of the A cavity and the horizontal plane of the A port, the working state of the A groove is used for connecting one group of throttling cavities and the A port, the height direction of the B groove covers the horizontal plane of the B cavity and the horizontal plane of the B port, and the working state of the B groove is used for connecting the other group of throttling cavities and the, the groove A, the cavity P, the groove B and the cavity T which are positioned in a plane where the cavity A is positioned are sequentially arranged at intervals and are respectively isolated through parting beads to form a group of oil circuit structures, the radian ranges corresponding to the parting beads on the two sides of the cavity P of the valve core cover the circumferential range of the corresponding cavity A on the working edge of the valve sleeve, the radian ranges corresponding to the parting beads on the two sides of the cavity T of the valve core cover the circumferential range of the corresponding cavity B on the working edge of the valve sleeve, and when the servo valve is in a zero position, the port P, the port T, the port A and the port B are isolated from each other; when the working state is in, the cavity A is communicated with the groove A or the groove B, the cavity B is communicated with the groove B or the groove A, and the oil paths are communicated and switched;
the positions of the groove A and the groove B are interchanged, and the function of the whole structure is unchanged;
Two oil grooves or oil cavities of the same type are arranged at two ends of the valve core with corresponding diameters, the diameter positions of the P cavity and the T cavity are mutually vertical, the diameter positions of the A cavity and the B cavity are mutually vertical, the central radian interval of the adjacent P cavity and the A cavity is 45 degrees, the number of the A cavity and the B cavity on the valve sleeve is two, the two A cavities and the two B cavities are arranged at two ends of the valve sleeve with corresponding diameters, and the diameter positions of the A cavity and the B cavity are mutually vertical;
the P cavity and the T cavity are groove bodies arranged in parallel to the central shaft of the valve core from bottom to top;
The radian ranges of the P cavity and the T cavity are the same, so that the whole structure is convenient to manufacture;
The radian ranges of the cavity A and the cavity B are the same, so that the whole structure is convenient to manufacture;
The radian range of the cavity A is larger than that of the cavity P in the plane of the cavity A;
The ports P, A, B and T are arranged from top to bottom along the height direction of the valve sleeve, the radian intervals of adjacent projection positions of the ports P, A, B and T in the projection state are 45 degrees, and each port and the corresponding position of an inner groove or cavity of the valve core switching oil circuit structure are correspondingly arranged;
A GREEN ring is sleeved at a position where the convex part of the central shaft of the valve core penetrates through the upper end cover, an inward concave annular groove is arranged at a corresponding position of the upper end cover, and the GREEN ring is arranged in the inner sleeve annular groove;
the upper end cover is fixedly connected with the upper end ring surface of the valve sleeve through a first screw, the lower end ring surface of the upper end cover is provided with an upper ring-shaped groove, the position of the valve sleeve corresponding to the upper ring-shaped groove is provided with a first ring-shaped boss, the first ring-shaped boss is embedded in the upper ring-shaped groove, and the lower end surface of the upper end cover is arranged in a manner that the corresponding area is clung to the upper end surface of the valve sleeve, so that the sealing of the valve sleeve and the upper end cover is;
the lower end cover is fixedly connected with the lower end annular surface of the valve sleeve through a second screw, a second annular boss is arranged on the lower end surface of the valve sleeve, a lower annular groove is arranged in the position, corresponding to the second annular boss, of the upper end surface of the lower end cover, the second annular boss is embedded in the lower annular groove, the lower end surface of the valve sleeve is tightly attached to the corresponding area of the upper end surface of the lower end cover, and sealing of the valve sleeve and the lower end cover is achieved.
adopt the utility model discloses afterwards, it opens throttle chamber (A chamber, B chamber) on the valve barrel to form case switching oil circuit structure through cell body or the cavity that sets up a plurality of indents in the case surface at case (5) mid portion, make the upper and lower terminal surface of oil circuit and valve barrel inner chamber all not communicate, reduced the interior volume of letting out of valve body, especially reduced the leakage volume of terminal surface, improved power efficiency.
Drawings
Fig. 1 is a schematic front view structure diagram of the present invention;
fig. 2 is a schematic side view of the valve body assembly of the present invention;
3 FIG. 3 3 3 is 3 a 3 schematic 3 sectional 3 view 3 A 3- 3 A 3 of 3 FIG. 3 2 3; 3
FIG. 4 is a schematic top view of the structure of FIG. 2;
FIG. 5 is a schematic view of section B-B of FIG. 4;
fig. 6 is a schematic structural view of a three-dimensional view of the valve core of the present invention;
the names corresponding to the sequence numbers in the figure are as follows:
the direct current brushless servo motor comprises a direct current brushless servo motor 1, a valve body assembly 2, a valve core 3, a valve sleeve 4, an upper end cover 5, a lower end cover 6, a central shaft 31, external threads 51, a central positioning hole 61, a P port 7, a T port 8, an A port 9, a B port 10, an A cavity 11, a B cavity 12, a P cavity 13, a T cavity 14, an A groove 15, a B groove 16, a parting strip 17, a Glae ring 18, an inner concave annular groove 19, a first screw 20, an upper annular groove 21, a first annular boss 22, a second screw 23, a second annular boss 24 and a lower annular groove 25.
Detailed Description
the thread cartridge type rotary direct-drive electro-hydraulic servo valve is shown in the figures 1-6: the valve comprises a direct current brushless servo motor 1 and a valve body component 2, wherein the valve body component comprises a valve core 3, a valve sleeve 4, an upper end cover 5 and a lower end cover 6, an output shaft of the direct current brushless servo motor 1 is connected with an upper convex part of a central shaft 31 of the valve core 3, the direct current brushless servo motor 1 is fixedly arranged at the upper end of the upper end cover 5, the valve core 3 is arranged in an inner cavity of the valve sleeve 4, external threads 51 are arranged on the peripheral surface of an outer ring of the upper end cover 5, the external threads 51 are used for being connected with an integrated valve block, the bottom of the valve core 3 is arranged in a central positioning hole 61 of the lower end cover 6, a P port 7, a T port 8, an A port 9 and a B port 10 which are externally communicated with the inner cavity are arranged on the valve sleeve 4, the P port 7, the T port 8, the A port 9 and the B port 10 are respectively arranged on different height, be A chamber 11, B chamber 12 respectively, A chamber 11, B chamber 12 are located the different circumference angular position of the coplanar of the inner wall circumference of valve barrel 4 and arrange, have arranged case switching oil circuit structure on the outer wall of case 3, and case switching oil circuit structure comprises a plurality of cell bodies or the cavity at the indent of case surface, and case switching oil circuit satisfies following condition: when the servo valve is in a zero position, the port P7, the port A9, the port B10 and the port T8 are isolated from each other; in the working state, the port P7 is communicated with the port A9 or the port B10 through a valve core switching oil path, the port T8 is communicated with the port B10 or the port A9 through a valve core switching oil path, and the port P7 and the port T8 are not communicated with the port A9 or the port B10 simultaneously.
two groups of symmetrically arranged oil circuit structures are arranged on the circumference of the outer wall of the valve core 3, each group of oil circuit structures comprises a P cavity 13, a T cavity 14, an A groove 15 and a B groove 16, the corresponding positions of the outer wall of the valve core 3 are respectively provided with the concave P cavity 13, the concave T cavity 14, the concave A groove 15 and the concave B groove 16, the height direction of the P cavity 13 covers the horizontal plane of the P port 7 and the horizontal plane of the A cavity 11, the P cavity 13 is connected with the P port 7 and the A cavity 11, the height direction of the T cavity 14 covers the horizontal plane of the T port 8 and the horizontal plane of the B cavity 12, the T cavity 14 is connected with the T port 8 and the B cavity 12, the height direction of the A groove 15 covers the horizontal plane of the A cavity 11 and the horizontal plane of the A port 9, the A groove 15 is used for connecting one group of throttling cavities and the A port 9 in a working state, the height direction of the B groove 16 covers the horizontal plane of the B cavity 12 and the horizontal plane of the B port 10, the B groove 16 is used for, the grooves A15, the cavities P13, the grooves B16 and the cavities T14 which are positioned in the plane of the cavity A11 are sequentially arranged at intervals and are respectively isolated through parting beads 17 to form a group of oil path structures, the radian ranges corresponding to the parting beads 17 on the two sides of the cavity P13 of the valve core 3 cover the circumferential range of the corresponding cavity A11 on the working edge of the valve sleeve 4, the radian ranges corresponding to the parting beads 17 on the two sides of the cavity T14 of the valve core 3 cover the circumferential range of the corresponding cavity B12 on the working edge of the valve sleeve 4, and when the servo valve is in a zero position, the port P7, the port T8, the port A9 and the port B10 are isolated from each other; when the working state is in, the cavity A11 is communicated with the groove A15 or the groove B16, the cavity B12 is communicated with the groove B16 or the groove A15, and oil paths are communicated and switched;
The positions of the groove A15 and the groove B16 are interchanged, and the function of the whole structure is unchanged;
Two oil grooves or oil cavities of the same type are arranged at two ends of the valve core with corresponding diameters, the diameter positions of a P cavity 13 and a T cavity 14 are mutually vertical, the diameter positions of an A cavity 15 and a B cavity 16 are mutually vertical, the central radian interval of the adjacent P cavity 13 and A cavity 15 is 45 degrees, the number of the A cavity 11 and the B cavity 12 on the valve sleeve 4 is two, the two A cavities 11 and the two B cavities 12 are arranged at two ends of the inner cavity of the valve sleeve 4 with corresponding diameters, and the diameter positions of the A cavity 11 and the B cavity 12 are mutually vertical;
the P cavity 13 and the T cavity 14 are grooves arranged in parallel with the central axis of the valve core 3 from bottom to top;
The radian ranges of the P cavity 13 and the T cavity 14 are the same, so that the whole structure is convenient to manufacture;
The radian ranges of the cavity A11 and the cavity B12 are the same, so that the whole structure is convenient to manufacture;
the radian range of the A cavity 11 is larger than that of the P cavity 13 in the plane of the A cavity.
In a specific embodiment, the P port 7, the A port 9, the B port 10 and the T port 8 are arranged from top to bottom along the height direction of the valve sleeve, the radian intervals of adjacent projection positions in the projection state of the P port 7, the A port 9, the B port 10 and the T port 8 are 45 degrees, and each port and the corresponding position of an inner groove or cavity of the valve core switching oil circuit structure are correspondingly arranged;
the position of the convex part of the central shaft 31 of the valve core 3, which penetrates through the upper end cover 5, is sleeved with a GREEN ring 18, the corresponding position of the upper end cover 5 is provided with an inward concave annular groove 19, and the GREEN ring 18 is arranged in the inner sleeve annular groove 19;
The upper end cover 5 is fixedly connected with the upper end ring surface of the valve sleeve 4 through a first screw 20, the lower end ring surface of the upper end cover 5 is provided with an upper ring-shaped groove 21, the position of the valve sleeve 4 corresponding to the upper ring-shaped groove 21 is provided with a first ring-shaped boss 22, the first ring-shaped boss 22 is embedded in the upper ring-shaped groove 21, the lower end surface of the upper end cover 5 is arranged in a manner that the corresponding area is tightly attached to the upper end surface of the valve sleeve 4, and the sealing of the valve sleeve 4;
The lower end cover 6 is fixedly connected with the lower end ring surface of the valve sleeve 4 through a second screw 23, a second annular boss 24 is arranged on the lower end surface of the valve sleeve 4, a lower annular groove 25 is arranged at the position, corresponding to the second annular boss 24, of the upper end surface of the lower end cover 6, the second annular boss 24 is embedded in the lower annular groove 25, the lower end surface of the valve sleeve 4 is arranged in a corresponding area tightly attached to the upper end surface of the lower end cover 6, and sealing between the valve sleeve 4 and the lower end cover 6 is achieved.
The working principle is as follows: when the servo valve is in a zero position, as shown in fig. 3, the port P, the port T, the port A and the port B are isolated from each other; at the moment, the port P is communicated with the cavity A through the cavity P, the port A is communicated with the lower part of the groove A, the port T is communicated with the cavity B through the cavity T, and the port B is communicated with the lower part of the groove B;
In a working state, the valve core a slightly rotates clockwise by an angle by taking the figure 3 as a zero position, the cavity A is communicated with the cavity A, the cavity B is communicated with the cavity B, the oil circuit is communicated and switched, and the port P is communicated with the port A and the port T is communicated with the port B; b, slightly rotating the valve core by an angle anticlockwise, wherein the cavity A is communicated with the groove B, the cavity B is communicated with the groove A, the oil way is communicated and switched, and the port P is communicated with the port B and the port T is communicated with the port A;
The throttling cavity (the cavity A and the cavity B) is arranged on the valve sleeve, and the middle part of the valve core (5) is provided with a plurality of groove bodies or cavities which are recessed in the outer surface of the valve core to form a valve core switching oil path structure, so that the oil path is not communicated with the upper end surface and the lower end surface of the inner cavity of the valve sleeve, the internal leakage of the valve body is reduced, particularly the leakage of the end surfaces is reduced, and the power efficiency is improved.
the beneficial effects are as follows: the direct-current servo motor is used as an electro-hydraulic conversion part of the threaded plug-in type rotary direct-drive electro-hydraulic servo valve, so that the requirement of frequent start and stop in the working process of the servo valve is met, and the adaptability of the servo motor to external load change is enhanced; zero jitter of the servo motor caused by mechanical characteristics is reduced, and therefore stability of the electro-hydraulic servo valve in the zero position is improved; the controllability of the servo motor at a zero position accessory is enhanced by properly prolonging the time of frequently starting and stopping the servo motor; by adjusting the throttling oil cavity, end face leakage is reduced.
the detailed description of the embodiments of the present invention has been provided, but the present invention is only the preferred embodiments of the present invention, and should not be considered as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention shall fall within the scope of the present patent application.
Claims (9)
1. The thread cartridge type rotary direct-drive electro-hydraulic servo valve comprises a direct-current brushless servo motor and a valve body assembly, wherein the valve body assembly comprises a valve core, a valve sleeve, an upper end cover and a lower end cover, an output shaft of the direct-current brushless servo motor is connected with an upward convex part of a central shaft of the valve core, the direct-current brushless servo motor is fixedly arranged at the upper end of the upper end cover, the valve core is arranged in an inner cavity of the valve sleeve, external threads are arranged on the peripheral surface of an outer ring of the upper end cover and used for being connected with an integrated valve block, and the bottom of the valve core is arranged in a central positioning hole of the lower end cover and is characterized in that: the valve sleeve is provided with a P port, a T port, an A port and a B port which are communicated with an inner cavity from the outside, the P port, the T port, the A port and the B port are respectively located on different height planes of the valve sleeve, the same ports are located on the same height plane, the inner wall of the valve sleeve is provided with two groups of inwards-concave throttling cavities which are respectively an A cavity and a B cavity, the A cavity and the B cavity are located on different circumferential angle positions of the same plane of the circumference of the inner wall of the valve sleeve, the outer wall of the valve core is provided with a valve core switching oil path structure, the valve core switching oil path structure is composed of a plurality of groove bodies or cavity bodies which are inwards-concave on the outer surface of the valve core, and the: when the servo valve is in a zero position, the port P, the port A, the port B and the port T are isolated from each other; when the valve core is in a working state, the port P is communicated with the port A or the port B through the valve core switching oil way, the port T is communicated with the port B or the port A through the valve core switching oil way, and the port P and the port T are not communicated with the port A or the port B at the same time.
2. The threaded cartridge type rotary direct-drive electro-hydraulic servo valve according to claim 1, characterized in that: the periphery of the outer wall of the valve core is provided with two groups of symmetrically arranged oil circuit structures, each group of oil circuit structure comprises a P cavity, a T cavity, an A groove and a B groove, the corresponding positions of the outer wall of the valve core are respectively provided with the inward concave P cavity, T cavity, A groove and B groove, the height direction of the P cavity covers the horizontal plane of the P port and the horizontal plane of the A cavity, the P cavity is connected with the P port and the A cavity, the height direction of the T cavity covers the horizontal plane of the T port and the horizontal plane of the B cavity, the T cavity is connected with the T port and the B cavity, the height direction of the A groove covers the horizontal plane of the A cavity and the horizontal plane of the A port, the working state of the A groove is used for connecting one group of throttling cavities and the A port, the height direction of the B groove covers the horizontal plane of the B cavity and the horizontal plane of the B port, and the working state of the B groove is used for connecting the other group of throttling cavities and the, the groove A, the cavity P, the groove B and the cavity T which are positioned in a plane where the cavity A is positioned are sequentially arranged at intervals and are respectively isolated through parting beads to form a group of oil circuit structures, the radian ranges corresponding to the parting beads on the two sides of the cavity P of the valve core cover the circumferential range of the corresponding cavity A on the working edge of the valve sleeve, the radian ranges corresponding to the parting beads on the two sides of the cavity T of the valve core cover the circumferential range of the corresponding cavity B on the working edge of the valve sleeve, and when the servo valve is in a zero position, the port P, the port T, the port A and the port B are isolated from each other; when the working state is in, the cavity A is communicated with the groove A or the groove B, the cavity B is communicated with the groove B or the groove A, and the oil paths are communicated and switched.
3. The threaded cartridge type rotary direct drive electro-hydraulic servo valve of claim 2, wherein: the positions of the groove A and the groove B are interchanged.
4. the threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 2 or 3, wherein: two oil grooves or oil cavities of the same type are arranged at two ends of the valve core corresponding to the diameter, the diameter positions of the P cavity and the T cavity are mutually vertical, the diameter positions of the A groove and the B groove are mutually vertical, the central radian interval of the adjacent P cavity and the A groove is 45 degrees, the number of the A cavity and the B cavity on the valve sleeve is respectively two, the two A cavity and the two B cavity are arranged at two ends of the valve sleeve inner cavity corresponding to the diameter, and the diameter positions of the A cavity and the B cavity are mutually vertical.
5. the threaded cartridge type rotary direct drive electro-hydraulic servo valve of claim 4, wherein: the P cavity and the T cavity are groove bodies arranged in parallel to the central shaft of the valve core from bottom to top; the radian ranges of the P cavity and the T cavity are the same; the radian ranges of the cavity A and the cavity B are the same; the radian range of the cavity A is larger than that of the cavity P in the plane of the cavity A.
6. The threaded cartridge type rotary direct-drive electro-hydraulic servo valve according to claim 1, characterized in that: the ports P, A, B and T are arranged from top to bottom along the height direction of the valve sleeve, the radian intervals of adjacent projection positions of the ports P, A, B and T in the projection state are 45 degrees, and each port and the corresponding position of an inner groove or cavity of the valve core switching oil circuit structure are correspondingly arranged.
7. the threaded cartridge type rotary direct-drive electro-hydraulic servo valve according to claim 1, characterized in that: the valve core is characterized in that a position, where the upper convex part of the central shaft of the valve core penetrates through the upper end cover, is sleeved with a GREEN ring, a concave annular groove is formed in a corresponding position of the upper end cover, and the GREEN ring is arranged in the concave annular groove.
8. the threaded cartridge type rotary direct-drive electro-hydraulic servo valve according to claim 1, characterized in that: the upper end cover is fixedly connected with the upper end ring surface of the valve sleeve through a first screw, an upper ring-shaped groove is formed in the lower end ring surface of the upper end cover, a first ring-shaped boss is arranged at the position, corresponding to the upper ring-shaped groove, of the valve sleeve, the first ring-shaped boss is embedded in the upper ring-shaped groove, and the lower end surface of the upper end cover is arranged in a mode that the corresponding area is tightly attached to the upper end surface of the valve sleeve.
9. The threaded cartridge type rotary direct-drive electro-hydraulic servo valve according to claim 1, characterized in that: the lower end cover is fixedly connected with the lower end annular surface of the valve sleeve through a second screw, a second annular boss is arranged on the lower end surface of the valve sleeve, a lower annular groove is arranged in the position, corresponding to the second annular boss, of the upper end surface of the lower end cover, the second annular boss is embedded in the lower annular groove, and the lower end surface of the valve sleeve is tightly attached to the corresponding area of the upper end surface of the lower end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920213767.0U CN209781323U (en) | 2019-02-20 | 2019-02-20 | Thread cartridge type rotary direct-drive electro-hydraulic servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920213767.0U CN209781323U (en) | 2019-02-20 | 2019-02-20 | Thread cartridge type rotary direct-drive electro-hydraulic servo valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209781323U true CN209781323U (en) | 2019-12-13 |
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ID=68795424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920213767.0U Active CN209781323U (en) | 2019-02-20 | 2019-02-20 | Thread cartridge type rotary direct-drive electro-hydraulic servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209781323U (en) |
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2019
- 2019-02-20 CN CN201920213767.0U patent/CN209781323U/en active Active
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