Integrated multi-position electro-hydraulic control shift valve

Abstract

The utility model discloses an integrated multi -notch electro -hydraulic control gear shift valve, including valve body and install on valve body multiple gear shift oil cylinder and multiple solenoid valve pair, gear shift oil cylinder and solenoid valve pair one -to -one correspondence, gear shift oil cylinder includes cylinder body and piston, and piston can move in the axial movement in cylinder body, and the sealed connection between piston and cylinder body divides the first oil cavity and the second oil cavity and separates the cylinder inner chamber, and the scheme is through setting first locating ring and second locating ring in the left and right sides of piston, and through the movement stroke of first locating ring and second locating ring is limited to the gear shift stroke of shift yoke is limited, through setting first elastic part and second elastic part in the left and right sides of piston to the idle position of piston is positioned accurately, guarantees the reliability and accuracy of gear shifting, through the pull rod of wearing in the piston and the fixed shift yoke axle, thereby the connecting relation between pull rod and shift yoke axle does not affect the idle position of piston.

Description

Technical Field

[0001] This utility model relates to the field of electro-hydraulic control shifting technology, and in particular to an integrated multi-position electro-hydraulic control shifting valve. Background Technology

[0002] In the power transmission systems of construction machinery, agricultural machinery, automobiles, and ships, mechanical shift forks are prevalent, such as the front and rear axle shift forks in the gearboxes of construction and agricultural machinery, high and low gear shift forks, and PTO and PTI clutch shift forks. These all require manual operation, resulting in numerous drawbacks, including complex mechanisms, difficult operation, high labor intensity, and, most importantly, difficulty in achieving remote and automated control. Current technologies often use electro-hydraulic shifting to replace mechanical shift forks for gear shifting. However, existing shift fork structures are cumbersome, and the neutral position is difficult to accurately locate, compromising the reliability and accuracy of gear shifting. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an integrated multi-position electro-hydraulic control shift valve with accurate neutral position positioning and reliable and accurate shifting.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An integrated multi-position electro-hydraulic control shift valve includes a valve body and multiple shift cylinders and multiple pairs of solenoid valves mounted on the valve body, with each shift cylinder and solenoid valve pair corresponding to the previous one. Each shift cylinder includes a cylinder body and a piston. The piston can move axially within the cylinder body, and the piston and cylinder body are sealed together, dividing the cylinder body into a first oil chamber and a second oil chamber. The first oil chamber is connected to one solenoid valve in the solenoid valve pair via an internal oil passage, and the second oil chamber is connected to the other solenoid valve in the solenoid valve pair via an internal oil passage. The second oil chamber contains a first elastic element and a first positioning ring, while the first oil chamber contains a second positioning ring and a second elastic element. One end of the first positioning ring and one end of the second positioning ring abut against the two sides of the piston, respectively. The other ends of the first and second positioning rings are axially movable and limited within the first and second grooves of the cylinder body, respectively. The first and second elastic elements act on the two sides of the piston and are used to reset the piston. One end of the piston extends out of the cylinder body, and a pull rod passes through the piston. One end of the pull rod extends out of the piston and is fixed to a shift fork assembly.

[0006] Preferably, the shift cylinder also includes a cylinder liner, which is positioned and installed inside the cylinder body. The cylinder liner is fitted over the piston, the first positioning ring and the second positioning ring and is clearance-fitted with the three. The two ends of the cylinder liner form a first groove and a second groove with the inner wall of the cylinder body, respectively.

[0007] When the shift cylinder is in neutral, the right end of the first positioning ring abuts against the left side of the piston, the left end of the first positioning ring is located in the first groove and abuts against the left end face of the cylinder sleeve, the left end of the first elastic element abuts against the inner wall of the cylinder, and the right end of the first elastic element abuts against the first positioning ring; the left end of the second positioning ring abuts against the right side of the piston, the right end of the second positioning ring is located in the second groove and abuts against the right end face of the cylinder sleeve, the right end of the second elastic element abuts against the inner wall of the cylinder, and the left end of the second elastic element abuts against the second positioning ring.

[0008] Preferably, a first sealing ring is provided between the cylinder liner and the piston, and a second sealing ring is provided between the cylinder liner and the cylinder body.

[0009] Preferably, the cylinder body has through holes at both the left and right ends, and the left end of the piston extends out of the cylinder body through the through hole; a cover plate is installed in the through hole at the right end of the cylinder body, the right end of the second elastic element abuts against the cover plate, and the left end of the second elastic element abuts against the second positioning ring.

[0010] Preferably, a third sealing ring is provided between the piston and the inner wall of the through hole, and a fourth sealing ring is provided between the cover plate and the cylinder body.

[0011] Preferably, the cover plate is provided with mounting holes, the sealing element is installed in the mounting holes of the cover plate, and a fifth sealing ring is provided between the sealing element and the cover plate.

[0012] Preferably, the shift fork assembly includes a shift fork and a shift fork shaft, one end of which is fixedly connected to a pull rod, and the shift fork is fixedly mounted on the shift fork shaft.

[0013] Preferably, the shift fork shaft and the pull rod are fixedly connected by a connecting block.

[0014] Preferably, a sixth sealing ring is provided between the piston and the rod.

[0015] Preferably, multiple shift cylinders and multiple solenoid valves are arranged longitudinally on both sides of the valve body; the multiple solenoid valves share the same oil inlet and oil return port.

[0016] This utility model, by adopting the above technical solution, has the following beneficial effects:

[0017] 1. This utility model limits the shifting stroke of the shift fork by setting a first positioning ring and a second positioning ring on the left and right sides of the piston and limiting the movement stroke of the first positioning ring and the second positioning ring. By setting a first elastic element and a second elastic element on the left and right sides of the piston, the neutral position of the piston is accurately positioned, ensuring the reliability and accuracy of shifting.

[0018] 2. This utility model uses a tie rod inserted inside the piston to fix it to the shift fork shaft, so that the connection between the tie rod and the shift fork shaft does not affect the neutral position of the piston, and further accurately positions the neutral position of the piston. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is a hydraulic schematic diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle AA section;

[0023] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB section;

[0024] Figure 5 This is a schematic diagram of the gear shifting cylinder.

[0025] Reference numerals: 100, shift cylinder; B1, first oil chamber; B2, second oil chamber; 101, cylinder body; 1011, first groove; 1012, second groove; 1013, first step; 1, shift fork; 4, shift fork shaft; 6, connecting block; 7, pull rod; 8, piston; 9, third sealing ring; 10, first elastic element; 11, first positioning ring; 12, cylinder sleeve; 14, first sealing ring; 15, second sealing ring; 16, second positioning ring; 17, second elastic element; 18, fourth sealing ring; 19, first retaining ring; 20, cover plate; 21, sealing element; 23, sixth sealing ring; 24, gasket; 25, valve body; 26, second retaining ring; 27, positioning pin; YV, solenoid valve. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] For clarity, in this invention, the side where the shift valve is connected to the shift fork assembly is designated as left, and vice versa.

[0032] Example 1:

[0033] like Figures 1 to 5As shown, this utility model discloses an integrated multi-position electro-hydraulic control shift valve, including a valve body 25 and multiple shift cylinders 100 and multiple pairs of solenoid valves mounted on the same valve body 25, with each shift cylinder 100 and solenoid valve pair corresponding one-to-one. Figure 1 As shown, multiple shift cylinders and multiple solenoid valves YV are arranged longitudinally on the left and right sides of the valve body 25; the multiple solenoid valves YV share the same oil inlet and oil return port. In this utility model, the solenoid valve YV is a cartridge-type two-position three-way solenoid directional valve.

[0034] like Figure 3 As shown, the shift cylinder 100 includes a cylinder body 101 and a piston 8. The piston 8 can move axially within the cylinder body 101. The piston 8 is sealed to the cylinder body 101 and divides the inner cavity of the cylinder body 101 into a first oil chamber B1 and a second oil chamber B2. The first oil chamber B1 is connected to the oil port of one of the solenoid valves YV in the solenoid valve pair through an internal oil passage. The second oil chamber B2 is connected to the oil port of the other solenoid valve YV in the solenoid valve pair through an internal oil passage. The second oil chamber B2 is provided with a first elastic element 10 and a first positioning ring 11, and the first oil chamber B1 is provided with a second positioning ring 12. 6. The first positioning ring 11 and the second positioning ring 16 abut against the two sides of the piston 8 respectively. The other ends of the first positioning ring 11 and the second positioning ring 16 are respectively axially movable and limited in the first groove 1011 and the second groove 1012 of the cylinder body 101. The first elastic element 10 and the second elastic element 17 act on the two sides of the piston 8 and are used to reset the piston 8. One end of the piston 8 extends out of the cylinder body 101. A pull rod 7 passes through the piston 8. One end of the pull rod 7 passes through the piston 8 and is fixed with a shift fork assembly. A sixth sealing ring 23 is provided between the piston 8 and the pull rod 7 to ensure the isolation of the first oil chamber B1 and the second oil chamber B2.

[0035] In this way, by setting the first positioning ring 11 and the second positioning ring 16 on the left and right sides of the piston 8, and by limiting the movement stroke of the first positioning ring 11 and the second positioning ring 16, the shifting stroke of the shift fork 1 is limited. By setting the first elastic element 10 and the second elastic element 17 on the left and right sides of the piston 8, the piston 8 can be reset. By fixing the pull rod 7, which passes through the piston 8, to the shift fork shaft 4, the connection between the pull rod 7 and the shift fork shaft 4 does not affect the neutral position of the piston 8, thereby ensuring the accurate positioning of the piston 8 in neutral and ensuring the reliability and accuracy of shifting.

[0036] In this design, the shift cylinder 100 also includes a cylinder liner 12, which is positioned and installed inside the cylinder body 101. Specifically, the cylinder body 101 has a first stepped portion 1013, and the left end of the cylinder liner 12 has a flange. The cylinder liner 12 is engaged with the first stepped portion 1013 of the cylinder body 101 by the flange, and is positioned by a first retaining ring 10. A second sealing ring 15 is provided between the cylinder liner 12 and the cylinder body 101 to ensure isolation between the first oil chamber B1 and the second oil chamber B2.

[0037] The cylinder liner 12 is fitted around the piston 8, the first positioning ring 11 and the second positioning ring 16 with clearance fit. A first sealing ring 14 is provided between the cylinder liner 12 and the piston 8 to ensure isolation between the first oil chamber B1 and the second oil chamber B2.

[0038] The two ends of the cylinder liner 12 form a first groove 1011 and a second groove 1012 with the inner wall of the cylinder body 101, respectively. When the shift cylinder 100 is in neutral, the right end of the first positioning ring 11 abuts against the left side of the piston 8, the left end of the first positioning ring 11 is located in the first groove 1011 and abuts against the left end face of the cylinder liner 12, the left end of the first elastic element 10 abuts against the inner wall of the cylinder body 101, and the right end of the first elastic element 10 abuts against the first positioning ring 11; the left end of the second positioning ring 16 abuts against the right side of the piston 8, the right end of the second positioning ring 16 is located in the second groove 1012 and abuts against the right end face of the cylinder liner 12, the right end of the second elastic element 17 abuts against the inner wall of the cylinder body 101, and the left end of the second elastic element 17 abuts against the second positioning ring 16. Both the first elastic element 10 and the second elastic element 17 are springs.

[0039] like Figure 3 and Figure 5 As shown, through holes are opened at both ends of the cylinder body 101. The left end of the piston 8 extends out of the cylinder body 101 through the through hole. A third sealing ring 9 is provided between the piston 8 and the inner wall of the through hole to prevent the pressure oil in the second oil chamber B2 from leaking out. A cover plate 20 is positioned and installed in the through hole at the right end of the cylinder body 101. A fourth sealing ring 18 is provided between the cover plate 20 and the cylinder body 101 to prevent the pressure oil in the first oil chamber B1 from leaking out. The right end of the second elastic member 17 abuts against the cover plate 20, and the left end of the second elastic member 17 abuts against the second positioning ring 16. In this way, by setting the cover plate 20, the disassembly and assembly of the various components in the shift cylinder 100 are facilitated.

[0040] Generally, the shift fork assembly includes a shift fork 1 and a shift fork shaft 4. One end of the shift fork shaft 4 is fixedly connected to the pull rod 7, and the shift fork 1 is fixedly mounted on the shift fork shaft 4. In this design, the shift fork shaft 4 and the pull rod 7 are fixedly connected by a connecting block 6. Specifically, one end of the shift fork shaft 4 is fixed to the connecting block 6 by a positioning pin 27. The pull rod 7 is a bolt, and the pull rod 7 is threadedly connected to the connecting block 6. The length of the pull rod 7 is greater than the length of the piston 8, thereby preventing the loosening or tightening of the pull rod 7 from affecting the neutral position of the piston 8, and the piston 8 plays a positioning role in the installation of the pull rod 7.

[0041] In this invention, the cover plate 20 has mounting holes, and the sealing member 21 is installed in the mounting holes of the cover plate 20. Thus, opening the sealing member 21 allows for loosening or tightening of the pull rod 7; that is, the pull rod 7 can be locked to the connecting block 6 using an Allen wrench. Tightening the pull rod 7 does not affect the neutral position of the piston 8. After assembly, the sealing member 21 can be installed, which is very convenient. In this design, the sealing member 21 is threaded into the mounting holes of the cover plate 20, acting as a plug. Of course, other detachable installation methods can also be used. A fifth sealing ring 22 is provided between the sealing member 21 and the cover plate 20 to prevent the pressure oil in the first oil chamber B1 from leaking out. Due to the addition of the cover plate 20, the second groove 1012 in the second oil chamber B2 is formed by the right end of the cylinder sleeve 12 and the cover plate 20.

[0042] The integrated multi-position electro-hydraulic control shift valve provided by this utility model is an independent control module that can be installed on any required mechanical part.

[0043] In this embodiment, the integrated multi-position electro-hydraulic control shift valve includes shift cylinders for positions I and II and shift cylinders for positions III and IV. The shift cylinders for positions I and II correspond to solenoid valves YV1 and YV2, respectively. Solenoid valve YV1 is connected to the first oil chamber B1 via port A1, and solenoid valve YV2 is connected to the second oil chamber B2 via port A2. The shift cylinders for positions III and IV correspond to solenoid valves YV3 and YV4, respectively. Solenoid valve YV3 is connected to oil chamber B3 via port A3, and solenoid valve YV4 is connected to oil chamber B4 via port A4.

[0044] Taking the operation of the I and II gear shift cylinders as an example, at this time, the III and IV gear shift cylinders are both in neutral, and the solenoid valves YV3 and YV4 corresponding to the III and IV gear shift cylinders are not energized.

[0045] When neither solenoid valves YV1 nor YV2 is energized, the oil inlet P is in a cut-off state, and the first oil chamber B1 and the second oil chamber B2 are connected to the return oil channel T at this time, with zero pressure; the first positioning ring 11 and the second positioning ring 16, under the action of the first elastic element 10 and the second elastic element 17 respectively, limit the piston 8 to the neutral state.

[0046] When the solenoid valve YV1 is energized, the oil at port P enters the first oil chamber B1 of the I and II gear cylinders through port A1. The hydraulic pressure acts on the right end face of the piston 8. When the force is greater than the spring force of the first elastic element 10, it will overcome the gear resistance and push the piston 8, the first positioning ring 11, the pull rod 7 and the shift fork shaft 4 to move to the left together until the left end of the first positioning ring 11 moves in the first groove 1011 until it is flush with the inner wall of the valve body 25. At this time, the shift fork shaft 4 drives the shift fork 1 to complete the gear shifting process.

[0047] When the solenoid valve YV1 is de-energized, the working oil in the first oil chamber B1 enters the return oil channel T through port A1. The hydraulic pressure at the right end of the piston 8 disappears, and the first elastic element 10 acts on the right end of the first positioning ring 11, pushing the piston 8, the first positioning ring 11, the shift fork shaft 4, and the pull rod 7 to move to the right together until the left end of the first positioning ring 11 moves in the first groove 1011 and is flush with the left end face of the cylinder liner 12. At this time, the gear returns to the neutral position.

[0048] When solenoid valve YV2 is energized, the oil at port P enters the second oil chamber B2 of cylinder I and II through port A2. The hydraulic pressure acts on the left end face of piston 8. When the force is greater than the spring force of the second elastic element 17, it will overcome the gear resistance and push piston 8, second positioning ring 16, pull rod 7 and shift fork shaft 4 to move to the right together until the right end of the second positioning ring 16 moves in the second groove 1012 until it is flush with the cover plate 20. At this time, shift fork shaft 4 drives shift fork 1 to complete the shifting process of the second gear.

[0049] When solenoid valve YV2 is de-energized, the working oil in the second oil chamber B2 enters the return oil passage T through port A2. The hydraulic pressure at the left end of piston 8 disappears, and the force of the second elastic element 17 acts on the left end of the second positioning ring 16, pushing piston 8, the second positioning ring 16, pull rod 7, and shift fork shaft 4 to move to the left together until the right end of the second positioning ring 16 moves within the second groove 1012 and is flush with the right end face of the cylinder liner 12. At this time, the gear returns to the neutral position.

[0050] The above explains the shifting process and logic control of gears I and II. The shifting process and logic control of gears III and IV are the same as those of gears I and II, and will not be repeated here.

[0051] Example 2:

[0052] In the integrated multi-gear electro-hydraulic control shift valve provided by this utility model, the number of shift cylinders 100 and solenoid valves YV can be set according to the number of gears. One shift cylinder 100 can control two gears, and each shift cylinder 100 is electro-hydraulic controlled by two solenoid valves YV.

[0053] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this utility model.

[0054] The technical solutions described in this utility model also include any one or more specific features, structures, materials or characteristics described above, formed individually or in combination.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. An integrated multi-position electro-hydraulic control shift valve, characterized in that, It includes a valve body (25) and multiple shift cylinders (100) and multiple solenoid valve pairs installed on the valve body (25), with each shift cylinder (100) and solenoid valve pair corresponding to the other. The shift cylinder (100) includes a cylinder body (101) and a piston (8). The piston (8) can move axially within the cylinder body (101). The piston (8) is sealed to the cylinder body (101) and divides the inner cavity of the cylinder body (101) into a first oil chamber (B1) and a second oil chamber (B2). The first oil chamber (B1) is connected to one of the solenoid valves (YV) in the solenoid valve pair through an internal oil passage. The second oil chamber (B2) is connected to the other solenoid valve (YV) in the solenoid valve pair through an internal oil passage. The second oil chamber (B2) is provided with a first elastic element (10) and a first positioning ring (11). The first oil chamber (B1) is provided with a second positioning ring (16) and a second elastic element (11). The piston (8) has one end of the first positioning ring (11) and one end of the second positioning ring (16) respectively abutting against the two sides of the piston (8). The other end of the first positioning ring (11) and the other end of the second positioning ring (16) are respectively axially movable and limited in the first groove (1011) and the second groove (1012) of the cylinder (101). The first elastic element (10) and the second elastic element (17) act on the two sides of the piston (8) respectively and are used to reset the piston (8). One end of the piston (8) extends out of the cylinder (101). A pull rod (7) passes through the piston (8). One end of the pull rod (7) passes through the piston (8) and is fixed with a fork assembly.

2. The integrated multi-position electro-hydraulic control shift valve according to claim 1, characterized in that, The shift cylinder (100) also includes a cylinder sleeve (12), which is positioned and installed inside the cylinder body (101). The cylinder sleeve (12) is sleeved on the piston (8), the first positioning ring (11) and the second positioning ring (16) and is clearance-fitted with the three. The two ends of the cylinder sleeve (12) form a first groove (1011) and a second groove (1012) with the inner wall of the cylinder body (101), respectively. When the shift cylinder (100) is in neutral, the right end of the first positioning ring (11) abuts against the left side of the piston (8), the left end of the first positioning ring (11) is located in the first groove (1011) and abuts against the left end of the cylinder sleeve (12), the left end of the first elastic element (10) abuts against the inner wall of the cylinder body (101), and the right end of the first elastic element (10) abuts against the first positioning ring (11); the left end of the second positioning ring (16) abuts against the right side of the piston (8), the right end of the second positioning ring (16) is located in the second groove (1012) and abuts against the right end of the cylinder sleeve (12), the right end of the second elastic element (17) abuts against the inner wall of the cylinder body (101), and the left end of the second elastic element (17) abuts against the second positioning ring (16).

3. The integrated multi-position electro-hydraulic control shift valve according to claim 2, characterized in that, A first sealing ring (14) is provided between the cylinder liner (12) and the piston (8), and a second sealing ring (15) is provided between the cylinder liner (12) and the cylinder body (101).

4. The integrated multi-position electro-hydraulic control shift valve according to claim 1, characterized in that, Both ends of the cylinder (101) have through holes, and the left end of the piston (8) extends out of the cylinder (101) through the through hole; a cover plate (20) is installed in the through hole at the right end of the cylinder (101), the right end of the second elastic element (17) abuts against the cover plate (20), and the left end of the second elastic element (17) abuts against the second positioning ring (16).

5. An integrated multi-position electro-hydraulic control shift valve according to claim 4, characterized in that, A third sealing ring (9) is provided between the piston (8) and the inner wall of the through hole, and a fourth sealing ring (18) is provided between the cover plate (20) and the cylinder (101).

6. An integrated multi-position electro-hydraulic control shift valve according to claim 4, characterized in that, The cover plate (20) is provided with mounting holes, and the sealing element (21) is installed in the mounting holes of the cover plate (20). A fifth sealing ring (22) is provided between the sealing element (21) and the cover plate (20).

7. An integrated multi-position electro-hydraulic control shift valve according to claim 1, characterized in that, The shift fork assembly includes a shift fork (1) and a shift fork shaft (4). One end of the shift fork shaft (4) is fixedly connected to the pull rod (7), and the shift fork (1) is fixedly installed on the shift fork shaft (4).

8. An integrated multi-position electro-hydraulic control shift valve according to claim 7, characterized in that, The fork shaft (4) and the pull rod (7) are fixedly connected by a connecting block (6).

9. An integrated multi-position electro-hydraulic control shift valve according to claim 1, characterized in that, A sixth sealing ring (23) is provided between the piston (8) and the rod (7).

10. An integrated multi-position electro-hydraulic control shift valve according to claim 1, characterized in that, Multiple shift cylinders and multiple solenoid valves are arranged longitudinally on both sides of the valve body (25); the multiple solenoid valves share the same oil inlet and oil return port.

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