Three-way valve and vehicle

Abstract

The utility model discloses a three position three way valve and vehicle, three position three way valve includes valve body, push rod subassembly and drive block, is equipped with valve cavity in the valve body, and the both ends of valve cavity correspond and the oil inlet and oil return port are opposite, and first push rod and second push rod are movably worn in the valve cavity and are equipped with first elastic member between both, drive block is movably arranged in the valve cavity, and drive block has first stop portion and second stop portion, is equipped with the limit block of first stop portion stop with first push rod, when drive block moves close to the oil inlet, second stop portion can push second push rod and move to the direction of far from the oil return port, and when the initial state, the oil inlet opens, and the oil return port closes, and first elastic member compresses, and second stop portion and second push rod have a section interval distance in its movement direction. Three position three way valve of the utility model can integrally realize the switching of three kinds of modes of pressurization, pressure maintenance and pressure reduction, and the structure is simple, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, specifically to a three-position three-way valve and a vehicle. Background Technology

[0002] Currently, anti-lock braking systems (ABS) are installed in two-wheeled, three-wheeled, and four-wheeled vehicles. During braking, these systems prevent wheel lock-up, thereby shortening braking distance and improving driving performance. The ABS repeatedly increases, maintains, or decreases the braking force applied to the wheels to prevent wheel lock-up. Increasing braking force is typically called the boost mode, maintaining braking force is called the hold mode, and decreasing braking force is called the depressurization mode.

[0003] In related technologies, three-position three-way valves typically require the simultaneous design of multiple drive mechanisms to control the opening and closing of multiple valve ports in order to switch between pressurization, pressure holding and pressure reduction modes. However, multiple drive mechanisms increase the complexity of the valve body structure, increase design costs, and may also lead to control failures due to inadequate coordination between different drive mechanisms. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to propose a three-position three-way valve that addresses the defects and deficiencies of the existing technology. This three-position three-way valve can switch between three modes of pressurization, pressure holding and pressure reduction in one integrated manner. Moreover, the switching between different modes can be achieved by only one set of drive mechanisms. It has a simple structure, low cost and high control reliability.

[0005] The three-position three-way valve of this utility model embodiment includes: a valve body having an oil inlet, an oil outlet, and a return oil outlet; a valve cavity provided within the valve body, with its two ends respectively opposite to the oil inlet and the return oil outlet; a first channel connecting the oil inlet and the oil outlet; and a second channel connecting the oil inlet and the return oil outlet; a push rod assembly including a first push rod and a second push rod, both of which are movably disposed within the valve cavity; the first push rod and the second push rod are spaced apart from each other and a first elastic element is provided between them; the first push rod is opposite to the oil inlet, and the second push rod is opposite to the return oil outlet; and a drive block movably disposed within the valve cavity along its length. The drive block has a first stop and a second stop. A limiting block is provided on the outer circumferential surface of the first push rod. The limiting block is located on the side of the first stop facing the second push rod. When the drive block moves toward the direction closer to the oil inlet, the second stop can push the second push rod toward the direction away from the oil return port and open the oil return port. When the drive block is in the initial state, the oil inlet is open and the oil return port is closed. The first elastic element is in a compressed state. The first stop and the limiting block abut against each other. The second stop and the second push rod have a distance between them in their movement direction. The distance between the second stop and the second push rod is greater than the distance between the first push rod and the oil inlet in the initial state.

[0006] In this embodiment of the three-position three-way valve, when the drive block is in its initial state, the oil inlet is open and the oil return port is closed. At this time, the brake pedal can be driven directly to achieve pressure increase. When it is necessary to switch to the pressure holding state, the drive block moves toward the oil inlet, and the first elastic element rebounds to drive the first push rod to move down to close the oil inlet. In the initial stage of the oil inlet closure, the first elastic element can support the second push rod to keep the oil return port closed. That is, when the drive block moves to this position, both the oil inlet and the oil return port are closed to maintain the pressure holding state. When it is necessary to switch to the pressure reducing state, the drive block continues to move until the second stop part contacts the second push rod. Then the second stop part can push the second push rod to move to open the oil return port. At this time, the oil inlet is closed and the oil return port is open. The hydraulic oil in the valve body can flow back through the oil return port to achieve pressure reduction. Thus, the three-position three-way valve of this application can realize the switching of three modes of pressure increase, pressure holding and pressure reduction in one unit. Moreover, the switching of different modes can be realized by only one set of drive mechanism (the drive block of this application). The structure is simple, the cost is low and the control reliability is high.

[0007] In some embodiments, the drive block is a moving iron core, the valve body includes a fixed iron core, an oil return assembly, and a magnetic shielding tube. The fixed iron core is provided with the oil outlet and the oil inlet. The oil return assembly is spaced above the fixed iron core and is provided with the oil return outlet. The moving iron core is disposed between the oil return assembly and the fixed iron core. The magnetic shielding tube is connected above the fixed iron core and covers the oil return assembly and the moving iron core. The fixed iron core is wound with a coil to generate a magnetic force to drive the moving iron core to move.

[0008] In some embodiments, the moving iron core is sleeved on the first push rod and the second push rod. The first push rod includes a first segment and a second segment. The first segment passes through the moving iron core and has the limiting block on its outer periphery. The second segment is located outside the moving iron core and passes through the fixed iron core. The end face of the fixed iron core facing the moving iron core has a downwardly recessed mounting groove. A second elastic member is sleeved on the second segment in the mounting groove. The two ends of the second elastic member abut against the bottom wall of the mounting groove and the end face of the moving iron core facing the fixed iron core, respectively. When the moving iron core is in the initial state, the second elastic member supports the moving iron core so that it maintains a one-end distance from the fixed iron core.

[0009] In some embodiments, the end face of the second push rod facing the oil return port has a plug and a shoulder surrounding the outer periphery of the plug. The second stop is located on the side of the shoulder away from the first push rod and is disposed on the inner circumferential surface of the moving iron core. The second stop is used to abut against the shoulder. When the moving iron core is in the initial state, the second stop and the shoulder are spaced apart by one end distance in the length direction of the valve cavity.

[0010] In some embodiments, the first elastic member is sleeved on the first segment, and the two ends of the first elastic member respectively abut against the limiting block and the second push rod.

[0011] In some embodiments, the oil return block is provided with an oil return pipe communicating with the oil return port. The oil return pipe extends toward the fixed iron core along the length direction of the valve cavity. The oil inlet is located at the bottom of the fixed iron core, and the oil outlet is located on the side of the fixed iron core.

[0012] In some embodiments, the drive block has a slot extending along the length of the valve cavity on its side, a portion of the return oil pipe is held in the slot, and the end of the return oil pipe facing the fixed iron core is inserted into the fixed iron core.

[0013] In some embodiments, a filter screen is fitted at the oil outlet.

[0014] In some embodiments, a limiting boss is provided on the outer peripheral surface of the fixed iron core, and the coil wound on the fixed iron core is located on the side of the limiting boss facing the moving iron core.

[0015] The vehicle of this utility model embodiment includes the three-position three-way valve described in the above embodiment.

[0016] The vehicle of this utility model embodiment can switch between three modes of pressurization, pressure holding and pressure reduction in one integrated manner by adopting the above-mentioned three-position three-way valve. The switching between different modes can be achieved by only one set of drive mechanism (drive block of this application). The structure is simple, the cost is low, the control reliability is high, and the vehicle performance is good. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a three-position three-way valve according to an embodiment of the present utility model.

[0018] Figure 2 This is an exploded view of a three-position three-way valve according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the integrated structure of a three-position three-way valve in a vehicle according to an embodiment of the present invention.

[0020] Figure label:

[0021] 1. Magnetic shielding tube, 2. Fixed iron core, 3. Moving iron core, 4. Oil return block, 5. Oil inlet assembly, 6. Filter screen, 7. First elastic element, 8. Second elastic element, 9. Limiting block, 10. First push rod, 11. Second push rod, 12. First stop part, 13. Second stop part, 14. Oil inlet, 15. Oil return port, 16. Oil return pipe. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figures 1-3 As shown, the three-position three-way valve of this utility model embodiment includes a valve body, a push rod assembly, and a drive block.

[0024] Specifically, the valve body has an oil inlet 14, an oil outlet, and an oil return port 15. A valve cavity is provided within the valve body, with its two ends facing the oil inlet 14 and the oil return port 15 respectively. A first channel connects the oil inlet 14 and the oil outlet, and a second channel connects the oil inlet 14 and the oil return port 15. The push rod assembly includes a first push rod 10 and a second push rod 11, both of which are movably inserted into the valve cavity. The first push rod 10 and the second push rod 11 are spaced apart from each other, and a first elastic element 7 is provided between them. The first push rod 10 faces the oil inlet 14, and the second push rod 11 faces the oil return port 15. A drive block is movably disposed within the valve cavity along its length, and the drive block has a first stop portion 12 and a second stop portion 13. The second stop 13 has a limiting block 9 on the outer circumferential surface of the first push rod 10. The limiting block 9 is located on the side of the first stop 12 facing the second push rod 11. When the drive block moves toward the direction close to the oil inlet 14, the second stop 13 can push the second push rod 11 toward the direction away from the oil return port 15 and open the oil return port 15. When the drive block is in the initial state, the oil inlet 14 is open and the oil return port 15 is closed. The first elastic element 7 is in a compressed state. The first stop 12 and the limiting block 9 abut against each other. The second stop 13 and the second push rod 11 have a distance between them in their movement direction. The distance between the second stop 13 and the second push rod 11 is greater than the distance between the first push rod 10 and the oil inlet 14 in the initial state.

[0025] Understandably, when the drive block is in its initial state, the oil inlet 14 and oil outlet are open, and the oil return port 15 is closed. At this time, the operator can press the brake pedal to open the oil circuit and supply oil to the oil inlet 14. The hydraulic oil can be output through the oil outlet to achieve pressurization. When it is necessary to switch to the pressure holding mode, the drive block moves towards the oil inlet 14. At this time, the elastic force of the first elastic element 7 can drive the first push rod 10 to move towards the oil inlet 14 until the oil inlet 14 is closed. Since the distance between the second stop 13 and the second push rod 11 is greater than the distance between the first push rod 10 and the oil inlet 14 in the initial state, the drive block and the second push rod 11 are not in contact when the oil inlet 14 is initially closed. That is, the drive block will not forcibly push the second push rod 11 at this time. As push rod 11 moves, due to the presence of the first elastic element 7, before the drive block pushes the second push rod 11, the first elastic element 7 can support the second push rod 11 to keep the return port 15 closed. At this time, both the inlet port 14 and the return port 15 are closed, and the three-way valve is in pressure-holding mode. When it is necessary to switch to the pressure-reducing state, the drive block continues to move towards the inlet port 14. When the drive block moves to the point where the second stop part 13 contacts the second push rod 11, continuing to move the drive block can force the second stop part 13 to overcome the supporting force of the first elastic element 7 and push the second push rod 11 in a direction away from the return port 15. At this time, the inlet port 14 is closed, the return port 15 is opened, and the hydraulic oil flows back through the return port 15 to achieve pressure reduction.

[0026] It is understood that the three-position three-way valve of this application can switch between three modes of pressurization, pressure holding and pressure reduction in one unit, and the switching between different modes can be achieved by only one set of drive mechanism (drive block of this application), which has a simple structure, low cost and high control reliability.

[0027] In this embodiment of the three-position three-way valve, when the drive block is in its initial state, the oil inlet 14 is open and the oil return port 15 is closed. At this time, the brake pedal can be driven to directly apply pressure. When it is necessary to switch to the pressure holding state, the drive block moves toward the oil inlet 14, and the first elastic element 7 rebounds, which can drive the first push rod 10 to move down to close the oil inlet 14. In the initial stage of closing the oil inlet 14, the first elastic element 7 can support the second push rod 11 to keep the oil return port 15 closed. That is, when the drive block moves to this position, both the oil inlet 14 and the oil return port 15 are closed to maintain the pressure holding state. When switching to the decompression state is required, continue moving the drive block until the second stop 13 contacts the second push rod 11. Then, the second stop 13 can push the second push rod 11 to open the return port 15. At this time, the inlet port 14 is closed and the return port 15 is opened. The hydraulic oil in the valve body can flow back through the return port 15 to achieve decompression. Thus, the three-position three-way valve of this application can realize the switching of three modes of pressurization, pressure holding and decompression in one piece. Moreover, the switching of different modes can be realized by only one set of drive mechanism (drive block of this application). The structure is simple, the cost is low and the control reliability is high.

[0028] In some embodiments, such as Figure 1 and Figure 2 As shown, the driving block is a moving iron core 3, and the valve body includes a fixed iron core 2, an oil return assembly 4, and a magnetic shielding tube 1. The fixed iron core 2 has an oil outlet and an oil inlet 14. The oil return assembly 4 is spaced above the fixed iron core 2 and has an oil return port 15. The moving iron core 3 is located between the oil return assembly 4 and the fixed iron core 2. The magnetic shielding tube 1 is connected above the fixed iron core 2 and covers the oil return assembly 4 and the moving iron core 3. The fixed iron core 2 has a coil wound on it to generate the magnetic force that drives the moving iron core 3. It can be understood that the coil wound on the fixed iron core 2 can form an electromagnet. By controlling the magnitude of the current, the electromagnet can generate different magnetic forces, that is, it can provide different driving forces for the moving iron core 3 to control the movement position of the driving block, and thus control the position of different push rods to realize the opening and closing of each valve port.

[0029] In other words, the three-position three-way valve of this application is a solenoid valve, which does not require a mechanical structure for setting a control drive block. It can control the three-way valve to switch between different modes simply by changing the magnitude of the input current, which is convenient to control and highly reliable.

[0030] For example, when switching from pressurization to pressure holding mode, a fixed current can be supplied to the coil. The electromagnet generates magnetic force that attracts the moving magnet to move towards the oil inlet 14. When the first push rod 10 moves to close the oil inlet 14, the current supply can be cut off. At this time, the second push rod 11 remains stationary under the support of the first elastic element 7, that is, the oil return port 15 is still closed. At this time, the valve body is in the pressure holding state. When it is necessary to switch from the pressure holding mode to the pressure reducing mode, the current can continue to be supplied to drive the moving magnet to continue moving until the moving magnet pushes the second push rod 11 to open the oil return port 15.

[0031] In one embodiment, the moving iron core 3 is sleeved on the first push rod 10 and the second push rod 11. Thus, the sleeved cooperation between the moving iron core 3 and the first push rod 10 and the second push rod 11 can achieve motion guidance and limiting functions, ensuring that the moving iron core 3 will not deviate or shake.

[0032] Additionally, it should be noted that a set of elastic elements can be fitted to the first push rod. The interaction between the elastic element's rebound force and the magnetic force generated by the fixed magnet allows for switching between different modes. Specifically, for example... Figure 1 As shown, the first push rod 10 includes a first section and a second section. The first section passes through the moving iron core 3 and has a limiting block 9 on its outer periphery. The second section is located outside the moving iron core 3 and passes through the fixed iron core 2. The end face of the fixed iron core 2 facing the moving iron core 3 has a downwardly recessed mounting groove. A second elastic member 8 is sleeved on the second section in the mounting groove. The two ends of the second elastic member 8 respectively abut against the bottom wall of the mounting groove and the end face of the moving iron core 3 facing the fixed iron core 2. When the moving iron core 3 is in the initial state, the second elastic member 8 supports the moving iron core 3 to maintain a one-end distance from the fixed iron core 2. Thus, when the coil on the fixed iron core 2 is not energized (in the initial state), the second elastic member 8 can use its elasticity to maintain a distance between the moving iron core 3 and the fixed iron core 2, providing space for the subsequent movement of the moving iron core 3, while keeping the oil inlet 14 open in the initial state.

[0033] In addition, the second elastic element 8 can counteract the pushing force applied by the fixed iron core 2 to the moving iron core 3 when compressed to a certain moment, so that the three-way valve can maintain the pressure holding state. For example, after a fixed current is passed through the fixed iron core 2, the moving iron core 3 moves toward the oil inlet 14 and compresses the second elastic element 8. As the first push rod 10 moves and closes the oil inlet 14, the moving iron core 3 continues to move and will continue to compress the second elastic element 8 until the rebound force of the second elastic element 8 can counteract the magnetic force generated by the fixed iron core 2. At this time, without changing the current, the moving magnet remains in the original position and no longer moves. The second push rod 11 can remain in the original position under the support of the first elastic element 7, and the oil return port 15 remains closed. When it is necessary to switch to the pressure reduction mode, the current needs to be increased to overcome the elastic force of the second elastic element 8, so that the moving iron core 3 continues to move and finally pushes the second push rod 11 to move and open the oil return port 15.

[0034] It is understandable that in different embodiments, the coil energization state is different when the three-way valve switches between different modes. Specifically, when the second elastic element 8 is provided on the first push rod 10, the coil is continuously energized, and when the pressure holding mode changes to the pressure reducing mode, the current is increased to overcome the elastic force of the second elastic element 8 to push the second push rod 11. When the second elastic element 8 is not provided on the first push rod 10, the coil is intermittently energized. That is, when maintaining the pressure holding state, the coil is de-energized, and the moving magnet remains in place. When the pressure holding mode changes to the pressure reducing mode, the coil is re-energized to drive the moving magnet to continue moving and finally push the second push rod 11 to move.

[0035] In some embodiments, such as Figure 1 As shown, the end face of the second push rod 11 facing the return port 15 has a plug and a shoulder surrounding the outer periphery of the plug. The second stop 13 is located on the side of the shoulder away from the first push rod 10 and is disposed on the inner circumferential surface of the moving iron core 3. The second stop 13 is used to stop against the shoulder, and when the moving iron core 3 is in the initial state, the second stop 13 and the shoulder are spaced apart by a distance along the length of the valve cavity. Thus, after the second stop 13 moves to contact the shoulder, the shoulder and the second stop 13 will make stop contact. At this time, the moving iron core 3 continues to move and will press the shoulder to push the second push rod 11 to move and open the return port 15.

[0036] In some embodiments, such as Figure 1 As shown, the first elastic element 7 is sleeved on the first section, and both ends of the first elastic element 7 abut against the limiting block 9 and the second push rod 11, respectively. Thus, the first push rod 10 can guide and limit the extension and retraction of the first elastic element 7, ensuring the reliability of the reciprocating extension and retraction of the first elastic element 7, avoiding deviation, and ensuring the reliability of the push rod movement.

[0037] In some embodiments, such as Figure 1 As shown, the oil return assembly 4 is provided with an oil return pipe 16 communicating with the oil return port 15. The oil return pipe 16 extends along the length of the valve cavity toward the fixed iron core 2. The oil inlet 14 is located at the bottom of the fixed iron core 2, and the oil outlet is located on the side of the fixed iron core 2. Thus, the oil return assembly 4 can return oil to the valve body through the oil return pipe 16. By placing the oil return port 15 at the top, there is no need to arrange additional oil return pipes 16. That is, the three-way valve of this application adopts a structure of bottom oil inlet, side oil outlet, and top oil return circulation.

[0038] In some embodiments, a slot extending along the length of the valve cavity is provided on the side of the drive block. A portion of the return oil pipe 16 is held in the slot, and the end of the return oil pipe 16 facing the fixed iron core 2 is inserted into the fixed iron core 2. Thus, the slot can position and fix the return oil pipe 16, and the slot on the side of the drive block can prevent the return oil pipe 16 from occupying external space, improve the compactness of the valve body, and optimize the structural layout.

[0039] Preferably, a filter screen 6 is fitted at the oil outlet. Specifically, as shown in the image... Figure 1 As shown, an oil inlet assembly 5 is provided at the oil inlet 14 at the bottom of the fixed iron core 2. Part of the filter screen 6 is fitted on the fixed iron core 2, and the other part is fitted on the oil inlet assembly 5. The filter screen 6 can filter the hydraulic oil at the outlet to prevent impurities from being output.

[0040] In some embodiments, such as Figure 1 As shown, a limiting boss is provided on the outer circumferential surface of the fixed iron core 2, and the coil wound on the fixed iron core 2 is located on the side of the limiting boss facing the moving iron core 3. Thus, the limiting boss can act as a limiting structure to prevent the coil from coming off.

[0041] The vehicle of this utility model embodiment includes the three-position three-way valve described in the above embodiment.

[0042] The vehicle of this utility model embodiment can switch between three modes of pressurization, pressure holding and pressure reduction in one integrated manner by adopting the above-mentioned three-position three-way valve. The switching between different modes can be achieved by only one set of drive mechanism (drive block of this application). The structure is simple, the cost is low, the control reliability is high, and the vehicle performance is good.

[0043] In addition, vehicles with different numbers of wheels are equipped with different numbers of three-way valves, for example, Figure 3 As shown in the figure, two three-position three-way valves of this application are integrated for use in anti-lock braking systems of vehicles such as electric vehicles and motorcycles.

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] 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 and variations to the above embodiments within the scope of the present invention.

Claims

1. A three-position three-way valve, characterized in that, include: The valve body has an oil inlet, an oil outlet, and an oil return port. The valve body has a valve cavity, the two ends of which are respectively opposite to the oil inlet and the oil return port. A first channel connects the oil inlet and the oil outlet, and a second channel connects the oil inlet and the oil return port. A push rod assembly, comprising a first push rod and a second push rod, both of which are movably disposed within the valve cavity. The first push rod and the second push rod are spaced apart from each other and a first elastic element is provided between them. The first push rod is opposite to the oil inlet, and the second push rod is opposite to the oil return port. A drive block is movably disposed within the valve cavity along its length. The drive block has a first stop and a second stop. A limiting block is provided on the outer circumferential surface of the first push rod. The limiting block is located on the side of the first stop facing the second push rod. When the drive block moves toward the direction closer to the oil inlet, the second stop can push the second push rod toward the direction away from the oil return port and open the oil return port. When the drive block is in its initial state, the oil inlet is open, the oil return port is closed, the first elastic element is in a compressed state, the first stop and the limiting block abut against each other, and the second stop and the second push rod have a distance between them in their direction of movement. The distance between the second stop and the second push rod is greater than the distance between the first push rod and the oil inlet in the initial state.

2. The three-position three-way valve according to claim 1, characterized in that, The drive block is a moving iron core. The valve body includes a fixed iron core, an oil return block, and a magnetic shielding tube. The fixed iron core is provided with an oil outlet and an oil inlet. The oil return block is spaced above the fixed iron core and is provided with an oil return port. The moving iron core is located between the oil return block and the fixed iron core. The magnetic shielding tube is connected above the fixed iron core and covers the oil return block and the moving iron core. The fixed iron core is wound with a coil to generate a magnetic force to drive the moving iron core.

3. The three-position three-way valve according to claim 2, characterized in that, The moving iron core is sleeved on the first push rod and the second push rod. The first push rod includes a first section and a second section. The first section passes through the moving iron core and has the limiting block on its outer periphery. The second section is located outside the moving iron core and passes through the fixed iron core. The end face of the fixed iron core facing the moving iron core has a downwardly recessed assembly groove. The assembly groove has a second elastic member sleeved on the second section. The two ends of the second elastic member abut against the bottom wall of the assembly groove and the end face of the moving iron core facing the fixed iron core, respectively. When the moving iron core is in the initial state, the second elastic member supports the moving iron core so that it maintains a one-end distance from the fixed iron core.

4. The three-position three-way valve according to claim 3, characterized in that, The second push rod has a plug and a shoulder surrounding the outer periphery of the plug on the end face facing the oil return port. The second stop is located on the side of the shoulder away from the first push rod and is provided on the inner circumferential surface of the moving iron core. The second stop is used to stop against the shoulder. When the moving iron core is in the initial state, the second stop and the shoulder are spaced apart by one end distance in the length direction of the valve cavity.

5. The three-position three-way valve according to claim 3, characterized in that, The first elastic element is sleeved on the first segment, and the two ends of the first elastic element respectively abut against the limiting block and the second push rod.

6. The three-position three-way valve according to any one of claims 2-5, characterized in that, The oil return block is provided with an oil return pipe that communicates with the oil return port. The oil return pipe extends toward the fixed iron core along the length direction of the valve cavity. The oil inlet is located at the bottom of the fixed iron core, and the oil outlet is located on the side of the fixed iron core.

7. The three-position three-way valve according to claim 6, characterized in that, The drive block has a slot extending along the length of the valve chamber on its side. Part of the return oil pipe is held in the slot, and the end of the return oil pipe facing the fixed iron core is inserted into the fixed iron core.

8. The three-position three-way valve according to claim 6, characterized in that, A filter screen is fitted at the oil outlet.

9. The three-position three-way valve according to any one of claims 2-5, characterized in that, The fixed iron core has a limiting boss on its outer circumferential surface, and the coil wound on the fixed iron core is located on the side of the limiting boss facing the moving iron core.

10. A vehicle, characterized in that, Includes a three-position three-way valve according to any one of claims 1-9.

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