Three-way valve and brake-by-wire system

Abstract

A three-way valve includes a valve block with a valve cavity and a first, second, and third channel communicating with the valve cavity. The valve cavity contains an upper valve seat, a support seat, a lower valve seat, and a movable valve core. The upper end of the support seat is fixedly connected to the upper valve seat, and the lower valve seat is fixedly connected to the lower end of the support seat. The valve core is movably disposed within the support seat and located between the upper and lower valve seats. The upper valve seat has a first connecting port through which the first channel communicates with the interior of the support seat. The support seat has a second connecting port through which the second channel communicates with the interior of the support seat. The lower valve seat has a third connecting port through which the third channel communicates with the interior of the support seat. This invention also provides a brake-by-wire system.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a three-way valve and a line-controlled braking system. Background Technology

[0002] Passenger vehicle hydraulic braking systems are undergoing a complete shift towards drive-by-wire technology, with electromechanical hydraulic systems becoming the mainstream. Currently, drive-by-wire systems mainly consist of a master cylinder, electric cylinder, wheel cylinders, solenoid valves, sensors, and an ECU. When the driver depresses the brake pedal, the ECU of the drive-by-wire system detects the change in value of the pedal displacement sensor connected to the pedal. It then uses this change to determine how much braking pressure the electric cylinder needs to provide and instructs the electric motor to work, thereby compressing the brake fluid, building up hydraulic pressure, and transmitting it to the wheel cylinders to provide braking force to the vehicle.

[0003] Three-way valves are widely used in hydraulic and pneumatic control systems. Their main structure consists of three fluid medium ports on the valve body, with an internal valve chamber connecting these ports. A movable valve core is located within the valve chamber, and its position controls the opening and closing of the channels between the different ports. Common three-way valves include two-position and three-position valves, typically driven mechanically or electromagnetically to control the valve core's movement and achieve the switching purpose. Taking a two-position three-way solenoid valve as an example, one end is driven by an electromagnet, while the other end is reset by a spring or other mechanical force.

[0004] However, the existing three-way valves have a relatively complex overall structure, which makes them more expensive and the manufacturing process of their parts more difficult, thus limiting their application in the industrial field. Therefore, it is necessary to improve the existing three-way valves. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a three-way valve and a line-controlled braking system with a relatively simple overall structure, low cost and low manufacturing difficulty of parts.

[0006] This invention provides a three-way valve, comprising a valve block, a valve cavity, and a first channel, a second channel, and a third channel communicating with the valve cavity. The valve cavity contains an upper valve seat, a support seat, a lower valve seat, and a movable valve core. The upper end of the support seat is fixedly connected to the upper valve seat, and the lower valve seat is fixedly connected to the lower end of the support seat. The valve core is movably disposed within the support seat and located between the upper and lower valve seats. The upper valve seat has a first connecting port through which the first channel communicates with the interior of the support seat. The support seat has a second connecting port through which the second channel communicates with the interior of the support seat. The lower valve seat has a third connecting port through which the third channel communicates with the interior of the support seat. When the valve core moves downward, it seals the third connecting port and simultaneously opens the first connecting port, allowing the first and second channels to communicate through the first and second connecting ports. When the valve core moves upward, it seals the first connecting port and simultaneously opens the third connecting port, allowing the third channel to communicate with the second channel through the third and second connecting ports.

[0007] In one embodiment, the support base is a hollow ring and has a funnel shape that is wider at the top and narrower at the bottom. The interior of the support base forms a cavity, and the valve core is housed in the cavity. The second communication port is provided through the side wall of the support base.

[0008] In one embodiment, the inner diameter of the upper end of the support is larger than the inner diameter of the middle part of the support, a first step is formed between the upper end of the support and the middle part of the support, the inner diameter of the middle part of the support is larger than the inner diameter of the lower end of the support, a second step is formed between the middle part of the support and the lower end of the support, and a second connecting port is provided through the side wall of the middle part of the support.

[0009] In one embodiment, a first sealing ring and a second sealing ring are provided inside the valve cavity outside the support seat. The first sealing ring is located below the first step and sandwiched between the inner wall of the valve cavity and the outer wall of the support seat. The second sealing ring is located below the second step and sandwiched between the inner wall of the valve cavity and the outer wall of the support seat.

[0010] In one embodiment, the upper end of the valve core is larger than the lower end of the valve core, and a third step is formed between the upper end and the lower end of the valve core. An elastic element is sleeved on the lower end of the valve core, and the elastic element is sandwiched between the second step and the third step.

[0011] In one embodiment, the lower valve seat is housed within a support base. The lower valve seat is an inverted cylindrical shape, and a third connecting port is disposed through the center of the top plate of the lower valve seat.

[0012] In one embodiment, the third connection port and the third channel are aligned vertically, with the third channel located directly below the third connection port.

[0013] In one embodiment, a flange face is provided protruding outward from the bottom of the lower valve seat, and the flange face abuts against the bottom of the support seat.

[0014] In one embodiment, the lower valve seat and the support seat are two different components, and the outer wall of the lower valve seat and the inner wall of the lower end of the support seat are interference-fitted.

[0015] In one embodiment, the support base and the upper valve seat are two different components, and the inner wall of the upper end of the support base and the outer wall of the lower end of the upper valve seat are fixed together by welding.

[0016] In one embodiment, the upper valve seat is cylindrical and has a cavity inside. The first communication port includes a radial communication hole through the side wall of the upper valve seat and an axial communication hole through the bottom plate of the upper valve seat. The radial communication hole communicates with the first channel, and the axial communication hole communicates with the cavity inside the support seat. The cavity inside the upper valve seat connects the radial communication hole and the axial communication hole to each other.

[0017] In one embodiment, an upper ring filter, a lower ring filter, and a bottom ring filter are provided in the valve cavity. The upper ring filter is located between the first channel and the first connecting port, the lower ring filter is located between the second channel and the second connecting port, and the bottom ring filter is located between the third channel and the third connecting port.

[0018] In one embodiment, the three-way valve further includes a valve body, the upper end of the support base is fixedly connected to the lower end of the upper valve seat, the upper end of the upper valve seat is fixedly connected to the lower end of the valve body, a valve stem is axially inserted through the center of the valve body, the valve stem is movably disposed in the valve body, and the lower end of the valve stem is fixedly connected to the valve core or the two abut against each other.

[0019] In one embodiment, the upper valve seat and the valve body are two different components, and the inner wall of the upper end of the upper valve seat and the outer wall of the lower end of the valve body are fixed together by welding.

[0020] In one embodiment, the three-way valve is a solenoid valve. The three-way valve also includes a coil and a moving iron. The moving iron is located above the valve body and is fixedly connected to the upper end of the valve stem.

[0021] In one embodiment, an elastic element is also provided inside the support base. One end of the elastic element abuts against the valve core, and the other end of the elastic element abuts against the support base or the lower valve seat. When the coil is energized, it drives the moving iron to move downward, which in turn drives the valve core to move downward and compresses the elastic element through the valve stem. When the coil is de-energized, the elastic element pushes the valve core upward through elastic force, which in turn drives the moving iron to move upward through the valve stem.

[0022] In one embodiment, the three-way valve further includes a magnetic shielding tube, the inside of which is a cavity, and the valve body and the moving iron are housed within the magnetic shielding tube, with the valve body fixedly connected to the magnetic shielding tube.

[0023] The present invention also provides a brake-by-wire system, including a master cylinder, an electric cylinder, a wheel cylinder and the aforementioned three-way valve, wherein the first channel of the three-way valve is connected to the electric cylinder, the second channel of the three-way valve is connected to the wheel cylinder, and the third channel of the three-way valve is connected to the master cylinder.

[0024] The three-way valve provided in this embodiment of the invention has a valve chamber and a first channel, a second channel, and a third channel communicating with the valve chamber. The valve chamber contains an upper valve seat, a support seat, a lower valve seat, and a movable valve core. The upper valve seat has a first connecting port through which the first channel communicates with the interior of the support seat; the support seat has a second connecting port through which the second channel communicates with the interior of the support seat; and the lower valve seat has a third connecting port through which the third channel communicates with the interior of the support seat. By moving the valve core up and down, the three-way valve can connect the first channel with the second channel or the third channel with the second channel. The overall structure of this three-way valve is relatively simple; the upper valve seat, support seat, and lower valve seat are all manufactured using a molding process, resulting in a simple structure and low cost. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the three-way valve in the energized state in an embodiment of the present invention.

[0027] Figure 2 for Figure 1 A partial structural diagram of a three-way valve.

[0028] Figure 3 This is a schematic diagram of the three-way valve in the power-off state in an embodiment of the present invention. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0030] The terms “up,” “down,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” “outer,” “horizontal,” and “vertical,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, 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 the present invention.

[0031] Moreover, the terms "first," "second," "third," etc., are merely used to distinguish elements with similar attributes, rather than to indicate or imply relative importance or a specific order.

[0032] Furthermore, the terms “including,” “comprising,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0033] This invention provides a three-way valve, which can be specifically applied to the hydraulic braking system of a passenger vehicle, such as in a brake-by-wire system, but is not limited thereto. The three-way valve can also be applied to other hydraulic and pneumatic control systems.

[0034] Please refer to Figure 1 and Figure 2 The three-way valve includes a valve block 10, which contains a valve cavity 11 and a first channel 12, a second channel 13, and a third channel 14 communicating with the valve cavity 11. The valve cavity 11 contains an upper valve seat 16, a support seat 17, a lower valve seat 18, and a movable valve core 19. The upper end of the support seat 17 is fixedly connected to the upper valve seat 16. The lower valve seat 18 is fixedly connected to the lower end of the support seat 17. The valve core 19 is movably disposed within the support seat 17 and located between the upper valve seat 16 and the lower valve seat 18. The upper valve seat 16 has a first connecting port 21 that connects the first channel 12 to the interior of the support seat 17. The support seat 17 has a second connecting port 22 that connects the second channel 13 to the interior of the support seat 17. The lower valve seat 18 has a third connecting port 23 that connects the third channel 14 to the interior of the support seat 17.

[0035] Specifically, the three-way valve is a solenoid valve. Figure 1 The diagram shows the energized state of the three-way valve. Please refer to... Figure 1 When energized, the valve core 19 is driven downwards. As it moves downwards, the valve core 19 seals the third connecting port 23 and simultaneously opens the first connecting port 21, allowing the first channel 12 and the second channel 13 to communicate through the first connecting port 21 and the second connecting port 22. It is worth noting that there is a gap (not labeled in the figure) between the outer wall of the valve core 19 and the inner wall of the support base 17, allowing oil to communicate between the first connecting port 21 and the second connecting port 22 through this gap.

[0036] Figure 3 The image shows the de-energized state of the three-way valve. Please refer to [the image / reference]. Figure 3 In the power-off state, the valve core 19 is driven to move upward. When the valve core 19 moves upward, it seals the first connecting port 21 and simultaneously the third connecting port 23, so that the third channel 14 and the second channel 13 are connected through the third connecting port 23 and the second connecting port 22.

[0037] To drive the valve core 19 upward, an elastic element 24 is also provided inside the support base 17. In this embodiment, one end of the elastic element 24 abuts against the valve core 19, and the other end of the elastic element 24 abuts against the support base 17. In other embodiments, one end of the elastic element 24 may abut against the valve core 19, and the other end of the elastic element 24 may abut against the lower valve seat 18. The elastic element 24 provides elastic force to push the valve core 19 upward. Specifically, the elastic element 24 may be a spring sleeved on the valve core 19, but is not limited to this.

[0038] The support base 17 is a hollow ring, funnel-shaped with a wider top and narrower bottom. A cavity is formed inside the support base 17, within which the valve core 19 is housed. A second communication port 22 penetrates the side wall of the support base 17. Specifically, the inner diameter of the upper end of the support base 17 is larger than the inner diameter of the middle part, forming a first step 25 between the upper end and the middle part of the support base 17. The inner diameter of the middle part of the support base 17 is larger than the inner diameter of the lower end, forming a second step 26 between the middle part and the lower end of the support base 17. The second communication port 22 penetrates the side wall of the middle part of the support base 17. The second communication port 22 is located above the second step 26.

[0039] The upper end of the valve core 19 is larger than the lower end of the valve core 19, forming a third step 27 between the upper and lower ends of the valve core 19. An elastic member 24 is fitted onto the lower end of the valve core 19. In this embodiment, the elastic member 24 is sandwiched between the second step 26 and the third step 27, meaning one end of the elastic member 24 abuts against the second step 26, and the other end abuts against the third step 27.

[0040] A first sealing ring 28 and a second sealing ring 29 are provided inside the valve chamber 11 outside the support base 17. The first sealing ring 28 is located below the first step 25 and sandwiched between the inner wall of the valve chamber 11 and the outer wall of the support base 17. The second sealing ring 29 is located below the second step 26 and sandwiched between the inner wall of the valve chamber 11 and the outer wall of the support base 17. By providing the first sealing ring 28, the oil in the first channel 12 and the second channel 13 cannot leak through the outside of the support base 17, but can only communicate through the first connecting port 21, the second connecting port 22 and the inside of the support base 17. By providing the second sealing ring 29, the oil in the second channel 13 and the third channel 14 cannot leak through the outside of the support base 17, but can only communicate through the second connecting port 22, the third connecting port 23 and the inside of the support base 17.

[0041] Specifically, the lower valve seat 18 is housed within the support base 17. The lower valve seat 18 is an inverted cylindrical shape and includes an annular sidewall (not shown) and a top plate (not shown) located at the top of the sidewall. The third connecting port 23 is disposed through the center of the top plate of the lower valve seat 18. Specifically, the third connecting port 23 and the third channel 14 are vertically aligned. The first channel 12 and the second channel 13 are arranged horizontally, and the third channel 14 is arranged vertically, located directly below the third connecting port 23.

[0042] The support base 17 and the upper valve seat 16 are two different components. The upper end of the support base 17 and the lower end of the upper valve seat 16 are fixedly connected. Specifically, the inner wall of the upper end of the support base 17 and the outer wall of the lower end of the upper valve seat 16 are fixed by laser welding.

[0043] The lower valve seat 18 and the support seat 17 are two different parts. The lower valve seat 18 and the lower end of the support seat 17 are fixedly connected. Specifically, the lower valve seat 18 and the lower end of the support seat 17 are press-fitted together, that is, the outer wall of the lower valve seat 18 and the inner wall of the lower end of the support seat 17 are press-fitted together.

[0044] In addition, a flange face 31 is provided on the bottom of the lower valve seat 18, which abuts against the bottom of the support seat 17 to prevent the lower valve seat 18 from being displaced relative to the support seat 17 due to hydraulic pressure.

[0045] Specifically, the upper valve seat 16 is cylindrical and includes an annular sidewall (not shown) and a bottom plate (not shown) located at the bottom end of the sidewall. The interior of the upper valve seat 16 is a cavity. The first communication port 21 includes a radial communication hole 211 penetrating the sidewall of the upper valve seat 16 and an axial communication hole 212 penetrating the bottom plate of the upper valve seat 16. The radial communication hole 211 communicates with the first channel 12, and the axial communication hole 212 communicates with the cavity inside the support base 17. The cavity inside the upper valve seat 16 connects the radial communication hole 211 and the axial communication hole 212. In this embodiment, the radial communication hole 211 is positioned higher than or equal to the top of the support base 17, so that the radial communication hole 211 is exposed and not blocked by the support base 17. The radial communication hole 211 corresponds to the first channel 12, allowing the first channel 12 to communicate with the cavity inside the support base 17 through the radial communication hole 211 and the axial communication hole 212.

[0046] Furthermore, the valve chamber 11 is provided with an upper ring filter 32, a lower ring filter 33, and a bottom ring filter 34. The upper ring filter 32 is located between the first channel 12 and the first connecting port 21, the lower ring filter 33 is located between the second channel 13 and the second connecting port 22, and the bottom ring filter 34 is located between the third channel 14 and the third connecting port 23. By providing filters in the valve chamber 11, impurities in the oil can be filtered out, preventing impurities from entering the valve chamber 11.

[0047] The upper ring filter 32 and the lower ring filter 33 are both annular and have a filter cloth inside (not labeled in the figure). The bottom ring filter 34 is cylindrical, meaning it includes annular sidewalls and a circular bottom wall. In other words, the cross-section of the bottom ring filter 34 is U-shaped. The filter cloth is only placed on its sidewalls, meaning the bottom wall of the bottom ring filter 34 does not have a filter cloth, in order to increase the flow rate. At the same time, an oil groove 35 is provided between the sidewall of the bottom ring filter 34 and the inner wall of the valve chamber 11 to prevent the gap between the bottom ring filter 34 and the valve block 10 from being too small and causing throttling.

[0048] Furthermore, the three-way valve also includes a valve body 15, the upper end of the support seat 17 is fixedly connected to the lower end of the upper valve seat 16, the upper end of the upper valve seat 16 is fixedly connected to the lower end of the valve body 15, and a valve stem 36 is axially provided through the center of the valve body 15. The valve stem 36 is movably disposed in the valve body 15, and the lower end of the valve stem 36 is fixedly connected to the valve core 19 or the two abut against each other.

[0049] The upper valve seat 16 and the valve body 15 are two different parts. The upper end of the upper valve seat 16 is fixedly connected to the lower end of the valve body 15. Specifically, the outer wall of the lower end of the valve body 15 and the inner wall of the upper end of the upper valve seat 16 are fixed by laser welding.

[0050] Specifically, the three-way valve is a solenoid valve, which also includes a coil 37 and a moving iron 38. The moving iron 38 is located above the valve body 15. After the valve stem 36 passes through the valve body 15, the upper end of the valve stem 36 protrudes above the valve body 15. The moving iron 38 is fixedly connected to the upper end of the valve stem 36, specifically, the upper end of the valve stem 36 and the moving iron 38 are interference-fitted. When the coil 37 is energized, it drives the moving iron 38 to move downward, which in turn drives the valve core 19 to move downward and compress the elastic element 24 through the valve stem 36. When the coil 37 is de-energized, the elastic element 24 pushes the valve core 19 upward through elastic force, which in turn drives the moving iron 38 upward through the valve stem 36.

[0051] Furthermore, the three-way valve also includes a magnetic shielding tube 39. The upper end of the magnetic shielding tube 39 is sealable, while the lower end is open. The interior of the magnetic shielding tube 39 is a cavity. The valve body 15 and the moving iron 38 are housed within the magnetic shielding tube 39 through the opening at the lower end of the magnetic shielding tube 39. The coil 37 is disposed outside the magnetic shielding tube 39. The valve body 15 is fixedly connected to the magnetic shielding tube 39. Specifically, the outer wall of the valve body 15 and the inner wall of the magnetic shielding tube 39 are fixed together by laser welding. The moving iron 38 can move up and down within the magnetic shielding tube 39.

[0052] When coil 37 is energized, valve body 15 and moving iron 38 are magnetized and attract each other. Since valve body 15 and magnetic shielding tube 39 are connected by laser welding and cannot move, moving iron 38 moves downward toward valve body 15 due to electromagnetic force, driving valve stem 36 and valve core 19 downward, and overcoming spring force to compress the spring. Finally, the bottom of valve core 19 is pressed tightly against the top plate of lower valve seat 18 to seal the third communication port 23. Figure 1 As shown, at this time, the first channel 12 and the second channel 13 are connected through the first connecting port 21 and the second connecting port 22.

[0053] When coil 37 is de-energized, the spring pushes valve core 19, valve stem 36, and moving iron 38 upward together through elastic force. Ultimately, the top of valve core 19 presses tightly against the bottom plate of upper valve seat 16, sealing the axial communication hole 212 of the first communication port 21. Figure 3 As shown, at this time, the third channel 14 and the second channel 13 are connected through the third connecting port 23 and the second connecting port 22.

[0054] The three-way valve provided in this embodiment of the invention has a valve block 10 with a valve cavity 11 and a first channel 12, a second channel 13, and a third channel 14 communicating with the valve cavity 11. The valve cavity 11 contains an upper valve seat 16, a support seat 17, a lower valve seat 18, and a movable valve core 19. The upper valve seat 16 has a first connecting port 21 that connects the first channel 12 to the interior of the support seat 17. The support seat 17 has a second connecting port 22 that connects the second channel 13 to the interior of the support seat 17. The lower valve seat 18 has a third connecting port 23 that connects the third channel 14 to the interior of the support seat 17. The three-way valve allows the first channel 12 to communicate with the second channel 13 or the third channel 14 to communicate with the second channel 13 by moving the valve core 19 up and down. The overall structure of this three-way valve is relatively simple; the upper valve seat 16, the support seat 17, and the lower valve seat 18 are all manufactured using molding processes, resulting in a simple structure and low cost.

[0055] In this embodiment, the valve block 10 can be made of aluminum, the valve body 15 and the moving iron 38 can be made of low carbon steel, the upper valve seat 16, the support seat 17, the lower valve seat 18 and the magnetic shielding tube 39 can be made of free-cutting stainless steel, the valve core 19 can be made of plastic, and the valve stem 36 can be made of low carbon steel or free-cutting stainless steel.

[0056] The present invention also provides a brake-by-wire system, including a master cylinder, an electric cylinder, and a wheel cylinder. Further, the brake-by-wire system also includes the aforementioned three-way valve, wherein the first channel 12 of the three-way valve is connected to the electric cylinder, the second channel 13 of the three-way valve is connected to the wheel cylinder, and the third channel 14 of the three-way valve is connected to the master cylinder.

[0057] For other structures and principles of brake-by-wire systems, please refer to existing technologies, which will not be elaborated here.

[0058] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A three-way valve comprising a valve block in which a valve chamber and a first passage, a second passage and a third passage communicating with the valve chamber are provided, characterized by, The valve cavity is provided with an upper valve seat, a support seat, a lower valve seat, a valve body and a movable valve core, the upper end of the upper valve seat is fixedly connected with the lower end of the valve body, the upper end of the support seat is fixedly connected with the lower end of the upper valve seat, the lower valve seat is fixedly connected at the lower end of the support seat, the valve core is movably arranged in the support seat and located between the upper valve seat and the lower valve seat, the upper valve seat is provided with a first communication port penetrating the upper valve seat and communicating the first channel with the inside of the support seat, the support seat is provided with a second communication port penetrating the support seat and communicating the second channel with the inside of the support seat, and the lower valve seat is provided with a third communication port penetrating the lower valve seat and communicating the third channel with the inside of the support seat; when the valve core moves downward, the third communication port is sealed and the first communication port is opened at the same time, so that the first channel and the second channel are communicated through the first communication port and the second communication port; when the valve core moves upward, the first communication port is sealed and the third communication port is opened at the same time, so that the third channel and the second channel are communicated through the third communication port and the second communication port.

2. The tee valve of claim 1, wherein The support seat is a hollow ring and is funnel-shaped with the upper part being wide and the lower part being narrow, the inside of the support seat forms a cavity, the valve core is accommodated in the cavity, and the second communication port is arranged through the side wall of the support seat.

3. The tee valve of claim 2, wherein The inner diameter of the upper end of the support seat is larger than the inner diameter of the middle part of the support seat, a first step part is formed between the upper end of the support seat and the middle part of the support seat, the inner diameter of the middle part of the support seat is larger than the inner diameter of the lower end of the support seat, a second step part is formed between the middle part of the support seat and the lower end of the support seat, and the second communication port is arranged through the side wall of the middle part of the support seat.

4. The tee valve of claim 3, wherein The first sealing ring and the second sealing ring are arranged outside the support seat in the valve cavity, the first sealing ring is located below the first step part and is clamped between the inner wall of the valve cavity and the outer wall of the support seat, and the second sealing ring is located below the second step part and is clamped between the inner wall of the valve cavity and the outer wall of the support seat.

5. The tee valve of claim 3 wherein, The upper end of the valve core is larger in size than the lower end of the valve core, a third step part is formed between the upper end of the valve core and the lower end of the valve core, an elastic member is sleeved on the lower end of the valve core, and the elastic member is clamped between the second step part and the third step part.

6. The tee valve of claim 1, wherein The lower valve seat is accommodated in the support seat, the lower valve seat is an inverted cylinder, and the third communication port is arranged through the center of the top plate of the lower valve seat.

7. The tee valve of claim 6 wherein, The third communication port and the third channel are vertically aligned, and the third channel is located directly below the third communication port.

8. The tee valve of claim 6, wherein The bottom of the lower valve seat is provided with a flange surface outwardly protruding, and the flange surface abuts against the bottom of the support seat.

9. The tee valve of claim 6 wherein, The lower valve seat and the support seat are two different components, and the outer wall of the lower valve seat and the inner wall of the lower end of the support seat are in interference fit.

10. The three-way valve according to any one of claims 1 to 9, wherein The support seat and the upper valve seat are two different components, and the inner wall of the upper end of the support seat and the outer wall of the lower end of the upper valve seat are fixed by welding.

11. The three-way valve according to any one of claims 1 to 9, wherein The upper valve seat is cylindrical, the inside of the upper valve seat is a cavity, the first communication port comprises a radial communication hole opened through the side wall of the upper valve seat and an axial communication hole opened through the bottom plate of the upper valve seat, the radial communication hole is in communication with the first channel, the axial communication hole is in communication with the cavity inside the support seat, and the cavity inside the upper valve seat connects the radial communication hole and the axial communication hole.

12. The three-way valve according to any one of claims 1 to 9, wherein An upper ring filter screen, a lower ring filter screen and a bottom ring filter screen are arranged in the valve cavity, the upper ring filter screen is arranged between the first channel and the first communication port, the lower ring filter screen is arranged between the second channel and the second communication port, and the bottom ring filter screen is arranged between the third channel and the third communication port.

13. The three-way valve according to any one of claims 1 to 9, wherein A valve rod is arranged in the center of the valve body in an axial direction, the valve rod is arranged in the valve body in an up-down movable manner, and the lower end of the valve rod is fixedly connected with the valve core or abuts against each other.

14. The three-way valve of claim 13, wherein The upper valve seat and the valve body are two different components, and the inner wall of the upper end of the upper valve seat and the outer wall of the lower end of the valve body are fixed by welding.

15. The tee valve of claim 13, wherein The three-way valve is an electromagnetic valve, further comprising a coil and a moving iron, the moving iron is located above the valve body, and the moving iron is fixedly connected with the upper end of the valve rod.

16. The tee valve of claim 15, wherein The support seat further comprises an elastic member, one end of the elastic member abuts against the valve core, and the other end of the elastic member abuts against the support seat or the lower valve seat; when the coil is powered on, the moving iron is driven to move downward, the valve core is driven to move downward by the valve rod and the elastic member is compressed; when the coil is powered off, the elastic member drives the valve core to move upward by elastic force, and the moving iron is driven to move upward by the valve rod.

17. The tee valve of claim 16, wherein The three-way valve further comprises a magnetic isolation tube, the inside of the magnetic isolation tube is a cavity, the valve body and the moving iron are accommodated in the magnetic isolation tube, and the valve body is fixedly connected with the magnetic isolation tube.

18. A brake-by-wire system comprising a master cylinder, an electric cylinder, and a wheel cylinder, characterized by, The three-way valve further comprises a magnetic isolation tube, the inside of the magnetic isolation tube is a cavity, the valve body and the moving iron are accommodated in the magnetic isolation tube, and the valve body is fixedly connected with the magnetic isolation tube. The three-way valve further comprises a magnetic isolation tube, the inside of the magnetic isolation tube is a cavity, the valve body and the moving iron are accommodated in the magnetic isolation tube, and the valve body is fixedly connected with the magnetic isolation tube.

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