A pneumatic control valve for commercial vehicle transmission brake

Abstract

The invention discloses a pneumatic control valve for a commercial vehicle transmission brake, which relates to the technical field of pneumatic control valves and comprises a valve sleeve, a first valve port is provided in the middle of the valve sleeve, a second valve port is provided on the outer side of the valve sleeve, a sleeve is fixedly sleeved on the outer wall of the valve sleeve, a coil skeleton is fixedly sleeved on the outer wall of the sleeve, a coil is sleeved on the outer wall of the coil skeleton, a magnetic cover is fixedly sleeved on the outer wall of the coil skeleton, the coil is located on the inner side of the magnetic cover, a contact terminal is fixedly installed on the bottom outer wall of the coil skeleton, a moving iron core is slidably sleeved on the bottom of the sleeve, in the invention, the moving iron core, a limit block, a sealing rubber assembly, a push rod assembly, a fixed iron core and a spring are all concentrated in the sleeve, compared with the traditional pneumatic control valve, the overall size is shortened and the structure is more compact, so that it is convenient for customers to arrange the control valve on the valve plate and to arrange the pneumatic control valve plate module in the transmission.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic control valves, and in particular to a pneumatic control valve for a commercial vehicle transmission brake. Background Art

[0002] When the gears are engaged during the AMT shifting process in commercial vehicles, it is necessary to control the speed of the two gears to be meshed. When the speeds are the same, the shift cylinder action is controlled to achieve gear meshing and realize the power transmission path of the new gear. The AMT brake can achieve the effect of reducing the gear speed. Its principle is similar to that of the clutch, and the corresponding friction torque is transmitted by controlling the position of the piston in the brake cavity. The common piston in the brake cavity is controlled by a two-position, two-position normally closed and a two-position, two-position normally open pneumatic control valve. The basic working principle of the pneumatic control valve is that when current passes through the electromagnetic coil, the coil generates a magnetic field, and the magnetic field acts on the moving iron core. The moving iron core moves under the action of the magnetic field, changing the gas flow channel and controlling the gas flow or direction. Different flow channels are arranged inside the valve body, and the movement of the valve core changes the opening and closing state of the flow channel, thereby realizing the on-off control of the gas.

[0003] For example, a pneumatic control valve for a commercial vehicle transmission shift cylinder is disclosed in a Chinese patent document with publication number CN117967856A, which records that "it includes a valve sleeve, a sleeve, a plastic frame, a coil, a static iron core, a moving iron core and a spring, an air inlet hole is provided inside the valve sleeve and a small sealing ring is provided on the outer side of the top, a large sealing ring is provided on the sleeve, an exhaust hole connected to the outside atmosphere is coaxially penetrated on the static iron core, and a magnetic component is connected to the static iron core; a ventilation groove is provided on the outer side of the moving iron core". The pneumatic control valve for a commercial vehicle transmission shift cylinder of the present invention has a small number of parts, a simple and compact structure, and a small size, which is convenient for customers to arrange solenoid valves on the valve plate and arrange pneumatic control valve plate modules in the gearbox.

[0004] The disadvantages still existing in the prior art are:

[0005] 1. The pneumatic control valve is divided into the electromagnetic part and the valve core and valve sleeve part. The overall size of the traditional pneumatic control valve is large, which is not conducive to the layout and gas path design in the gearbox;

[0006] 2. The traditional pneumatic control valve directly installs the sealing rubber in the moving iron core. Since the sealing rubber will deform during use, the sealing rubber and the groove on the moving iron core are not compatible. Therefore, the sealing rubber of the traditional pneumatic control valve is easy to fall off, thus affecting the sealing of the valve body;

[0007] 3. During the installation of the sealing rubber, the removal and placement of the moving iron core and the transfer and transportation will easily cause scratches and bumps on the surface of the moving iron core, affecting the quality of the later surface coating, making the outer surface of the moving iron core rougher, resulting in increased friction during the movement of the moving iron core and a decrease in its service life;

[0008] 4. After the sealing rubber is installed, the outer surface of the moving iron core needs to be coated. The coating is carried out in a high-temperature environment. The high temperature will affect the life and sealing characteristics of the sealing rubber, resulting in reduced sealing of the solenoid valve and shortened life. Summary of the invention

[0009] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a pneumatic control valve for a commercial vehicle transmission brake.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A pneumatic control valve for a commercial vehicle transmission brake, comprising a valve sleeve, a first valve port is provided in the middle of the valve sleeve, a second valve port is provided on the outer side of the valve sleeve, a sleeve is fixedly sleeved on the outer wall of the valve sleeve, a coil frame is fixedly sleeved on the outer wall of the sleeve, a coil is sleeved on the outer wall of the coil frame, a magnetic cover is fixedly sleeved on the outer wall of the coil frame, the coil is located on the inner side of the magnetic cover, a contact terminal is fixedly installed on the bottom outer wall of the coil frame, a moving iron core is slidably sleeved on the bottom of the sleeve, and the moving iron core is An inner groove is provided at the bottom of the core, the moving iron core is located in the inner groove and fixedly sleeved with a limiting block, the inner wall of the sleeve is fixedly sleeved with a fixed iron core, the fixed iron core is located directly above the moving iron core, a center hole is provided in the middle of the fixed iron core, the fixed iron core is located at the center hole and is slidably sleeved with a push rod assembly, the bottom end of the push rod assembly is in contact with the outer wall of the moving iron core, the top of the push rod assembly is fixedly connected with a sealing rubber assembly, the sealing rubber assembly corresponds to the first valve port, and the outer wall of the sealing rubber assembly is sleeved with a spring.

[0012] Preferably, the push rod assembly comprises a push rod, the push rod is slidably sleeved with the fixed iron core through a center hole, a connecting plate is fixedly connected to the top of the push rod, and a connecting hole is opened on the outer wall of the connecting plate;

[0013] The sealing rubber assembly includes a rubber sheet, a rubber column is fixedly connected to the lower surface of the rubber sheet, the rubber column is sleeved with the connecting plate through a connecting hole, the other end of the rubber column is fixedly connected to a rubber ring, the rubber sheet is located directly above the connecting plate, the rubber ring is located directly below the connecting plate, and the push rod and the rubber ring are sleeved with each other.

[0014] Preferably, the spring and the rubber sheet are sleeved with each other, the diameter of the connecting plate is larger than the diameter of the rubber sheet, and the bottom of the spring is in contact with the outer wall of the connecting plate;

[0015] A limiting groove is provided at the bottom of the valve sleeve, and the top of the spring extends into the limiting groove.

[0016] Preferably, a slot is provided on the top outer wall of the valve sleeve, and a sealing ring is fixedly sleeved on the valve sleeve at the slot.

[0017] Preferably, the outer wall of the valve sleeve is provided with a fixing protrusion, the valve sleeve and the fixing protrusion are integrally formed, the top of the sleeve is provided with a fixing cylinder matching the fixing protrusion, the fixing cylinder and the sleeve are integrally formed, and the fixing protrusion and the fixing cylinder are sleeved with each other;

[0018] An inner protrusion is arranged at the bottom of the sleeve, and the inner protrusion is integrally formed with the sleeve. The sleeve is a thin-walled stretched part.

[0019] Preferably, a first breathing hole is opened on the top of the moving iron core, and the first breathing hole is connected to the inner groove.

[0020] Preferably, an annular groove is provided on the bottom inner wall of the moving iron core, and a limiting protrusion is provided on the bottom outer wall of the limiting block, and the limiting protrusion matches the annular groove;

[0021] The side wall of the limiting block is provided with a side opening, the bottom of the limiting block is provided with a lower opening, and the lower opening is located at a side close to the limiting protrusion.

[0022] Preferably, the outer wall of the fixed iron core is provided with a second breathing hole, and there are two second breathing holes, which are respectively located on both sides of the central hole;

[0023] The fixed iron core is provided with a chamfer at the center hole, and the chamfer is located at the top of the center hole.

[0024] Preferably, a positioning block is provided at the bottom of the coil frame, the positioning block and the coil frame are integrally formed, a positioning hole matching the positioning block is provided at the bottom of the magnetic cover, and the positioning block is sleeved with the magnetic cover through the positioning hole;

[0025] A through hole is provided at the bottom of the magnetic cover, and the sleeve passes through the through hole and extends to the outside of the magnetic cover. The sleeve is interference-fitted with the magnetic cover through the through hole.

[0026] Preferably, a magnetic gasket is fixedly sleeved on the top outer wall of the coil skeleton, and the magnetic gasket is located above the magnetic cover.

[0027] The beneficial effects of the present invention are:

[0028] 1. In the present invention, through the design of the sleeve, the moving iron core, the limit block, the sealing rubber assembly, the push rod assembly, and the fixed iron core, the moving iron core, the limit block, the sealing rubber assembly, the push rod assembly, the fixed iron core, and the spring are all concentrated in the sleeve. Compared with the traditional pneumatic control valve, the overall size is shortened and the structure is more compact, so that it is convenient for customers to arrange the control valve on the valve plate and arrange the pneumatic control valve plate module in the gearbox.

[0029] 2. In the present invention, through the design of the moving iron core, the sealing rubber assembly and the push rod assembly, the moving iron core moves upward due to the electromagnetic force, the moving iron core pushes the push rod assembly to move upward, the push rod assembly drives the sealing rubber assembly to move upward, and the sealing rubber assembly seals the first valve port. That is, the air circuit switch adopts the structural design of the push rod assembly pushing the sealing rubber assembly to seal the first valve port, so that the sealing of the pneumatic control valve is more reliable.

[0030] 3. In the present invention, through the design of the sealing rubber assembly and the push rod assembly, the sealing rubber assembly can be effectively fixed to the top of the push rod assembly to prevent the sealing rubber assembly from falling off during operation, thereby enhancing the robustness of the solenoid valve. Compared with the traditional sealing method of the pneumatic control valve, the present invention does not assemble the sealing rubber in the moving iron core, and the sealing rubber of the traditional pneumatic control valve is easy to fall off. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic structural diagram of a pneumatic control valve for a commercial vehicle transmission brake.

[0032] Figure 2 The present invention is a front view of a pneumatic control valve for a commercial vehicle transmission brake.

[0033] Figure 3 A commercial vehicle transmission brake pneumatic control valve of the present invention Figure 2 Cross-sectional view at BB in the middle.

[0034] Figure 4 The present invention is an axonometric view of a valve sleeve of a pneumatic control valve for a commercial vehicle transmission brake.

[0035] Figure 5 The present invention is a schematic structural diagram of a valve sleeve and a first valve port of a pneumatic control valve for a commercial vehicle transmission brake.

[0036] Figure 6 The present invention is a schematic structural diagram of a sleeve of a pneumatic control valve for a commercial vehicle transmission brake.

[0037] Figure 7 The present invention is an axonometric view of a moving iron core of a pneumatic control valve for a commercial vehicle transmission brake.

[0038] Figure 8 The present invention is a schematic structural diagram of a moving iron core, an inner groove and an annular groove of a pneumatic control valve for a commercial vehicle transmission brake.

[0039] Fig. 9 The present invention is a schematic structural diagram of a moving iron core, a first breathing hole, an inner groove, and an annular groove of a pneumatic control valve for a commercial vehicle transmission brake.

[0040] Fig.10 The present invention is an axonometric view of a limit block of a pneumatic control valve for a commercial vehicle transmission brake.

[0041] Fig.11 The present invention is a schematic structural diagram of a limit block, a side opening, a lower opening and a limit protrusion of a pneumatic control valve for a commercial vehicle transmission brake.

[0042] Fig.12 The present invention is an axonometric view of a fixed iron core of a pneumatic control valve for a commercial vehicle transmission brake.

[0043] Fig.13 A commercial vehicle transmission brake pneumatic control valve of the present invention Figure 3 Schematic diagram of the local structure at point C in the middle.

[0044] Fig.14 The present invention is a schematic structural diagram of a push rod assembly of a pneumatic control valve for a commercial vehicle transmission brake.

[0045] Fig.15 The present invention is a schematic structural diagram of a sealing rubber component of a pneumatic control valve for a commercial vehicle transmission brake.

[0046] Fig.16 The present invention is a schematic structural diagram of a spring of a pneumatic control valve for a commercial vehicle transmission brake.

[0047] Fig.17 The present invention is a bottom view of a pneumatic control valve for a commercial vehicle transmission brake.

[0048] Fig.18 The present invention is a gas flow schematic diagram of a pneumatic control valve for a commercial vehicle transmission brake.

[0049] Numbers in the figure: 1, valve sleeve; 101, first valve port; 102, second valve port; 103, slot; 104, fixed protrusion; 105, limit groove; 2, sleeve; 201, fixed sleeve; 202, inner protrusion; 3, coil skeleton; 301, positioning block; 4, magnetic cover; 401, positioning hole; 402, through hole; 5, moving iron core; 501, first breathing hole; 502, inner groove; 503, annular groove; 6, limit block; 601, side opening; 602, lower opening; 603, limiting protrusion; 7, sealing rubber assembly; 701, rubber sheet; 702, rubber column; 703, rubber ring; 8, push rod assembly; 801, push rod; 802, connecting plate; 803, connecting hole; 9, fixed iron core; 901, center hole; 902, second breathing hole; 10, spring; 11, coil; 12, magnetic gasket; 13, contact terminal; 14, sealing ring. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] As attached Figure 1 To Attachment Fig.17 As shown:

[0052] A pneumatic control valve for a commercial vehicle transmission brake comprises a valve sleeve 1, a first valve port 101 is provided in the middle of the valve sleeve 1, a second valve port 102 is provided on the outer side of the valve sleeve 1, a sleeve 2 is fixedly sleeved on the outer wall of the valve sleeve 1, a coil skeleton 3 is fixedly sleeved on the outer wall of the sleeve 2, a coil 11 is sleeved on the outer wall of the coil skeleton 3, a magnetic cover 4 is fixedly sleeved on the outer wall of the coil skeleton 3, the coil 11 is located on the inner side of the magnetic cover 4, a contact terminal 13 is fixedly installed on the outer wall of the bottom of the coil skeleton 3, a moving iron core 5 is slidably sleeved on the bottom of the sleeve 2, an inner groove 502 is provided on the bottom of the moving iron core 5, and the moving iron core 5 A limit block 6 is fixedly sleeved in the inner groove 502, a fixed iron core 9 is fixedly sleeved on the inner wall of the sleeve 2, the fixed iron core 9 is located directly above the moving iron core 5, a center hole 901 is opened in the middle of the fixed iron core 9, a push rod assembly 8 is slidably sleeved on the fixed iron core 9 at the center hole 901, the bottom end of the push rod assembly 8 is in contact with the outer wall of the moving iron core 5, a sealing rubber assembly 7 is fixedly connected to the top of the push rod assembly 8, and the sealing rubber assembly 7 and the push rod assembly 8 are connected by an inlay injection molding process, the sealing rubber assembly 7 corresponds to the first valve port 101, and a spring 10 is sleeved on the outer wall of the sealing rubber assembly 7.

[0053] In the above technical solution, when the pneumatic control valve is not energized, the coil 11 is not excited, and the elastic force of the spring 10 pushes the push rod assembly 8 and the moving iron core 5 to the limit position. At this time, the pneumatic control valve is in the initial position, and the first valve port 101 is in a normally open state;

[0054] When the pneumatic control valve is powered on, the coil 11 applies a certain excitation, the moving iron core 5 moves upward under the electromagnetic force, the moving iron core 5 pushes the push rod assembly 8 to move upward, the push rod assembly 8 drives the sealing rubber assembly 7 to move upward, and the sealing rubber assembly 7 seals the first valve port 101; when the coil 11 loses the excitation, the electromagnetic force disappears, the push rod assembly 8 is reset by the elastic force of the spring 10 and the pressure of the first valve port 101 moves downward, as shown in the attached figure. Fig.18 As shown, the pressure at the P port is downward, and the first valve port 101 is opened, and the gas flows from the first valve port 101 to the second valve port 102. Fig.18 As shown, the gas flows from port P to port A.

[0055] As attached Figure 3 and attached Fig.14 To Attachment Fig.15As shown, the push rod assembly 8 includes a push rod 801, which is slidably connected to the fixed iron core 9 through a center hole 901, and a connecting plate 802 is fixedly connected to the top of the push rod 801, and a connecting hole 803 is opened on the outer wall of the connecting plate 802; the sealing rubber assembly 7 includes a rubber sheet 701, and a rubber column 702 is fixedly connected to the lower surface of the rubber sheet 701, and the rubber column 702 is mutually connected with the connecting plate 802 through the connecting hole 803, and the other end of the rubber column 702 is fixedly connected to a rubber ring 703, the rubber sheet 701 is located directly above the connecting plate 802, and the rubber ring 703 is located directly below the connecting plate 802, and the push rod 801 and the rubber ring 703 are mutually connected.

[0056] In the above technical solution, through the design of the sealing rubber assembly 7 and the push rod assembly 8, the sealing rubber assembly 7 can be effectively fixed to the top of the push rod assembly 8 to prevent the sealing rubber assembly 7 from falling off during operation.

[0057] The spring 10 and the rubber sheet 701 are mutually sleeved, the diameter of the connecting plate 802 is larger than the diameter of the rubber sheet 701, and the bottom of the spring 10 contacts the outer wall of the connecting plate 802; a limiting groove 105 is provided at the bottom of the valve sleeve 1, and the top of the spring 10 extends into the limiting groove 105.

[0058] In the above technical solution, the top of the spring 10 can be limited by the design of the limiting groove 105. The spring 10 is placed on the top of the push rod assembly 8, and the spring 10 and the rubber sheet 701 are mutually sleeved, so that the bottom of the spring 10 can be limited.

[0059] A clamping groove 103 is formed on the top outer wall of the valve sleeve 1 , and a sealing ring 14 is fixedly sleeved on the valve sleeve 1 at the clamping groove 103 .

[0060] As attached Figure 5 To Attachment Figure 6 As shown, the outer wall of the valve sleeve 1 is provided with a fixing protrusion 104, the valve sleeve 1 and the fixing protrusion 104 are integrally formed, the top of the sleeve 2 is provided with a fixing cylinder 201 matching the fixing protrusion 104, the fixing cylinder 201 and the sleeve 2 are integrally formed, and the fixing protrusion 104 and the fixing cylinder 201 are mutually sleeved; the bottom of the sleeve 2 is provided with an inner protrusion 202, the inner protrusion 202 and the sleeve 2 are integrally formed, and the sleeve 2 is a thin-walled stretched part.

[0061] In the above technical solution, the outer wall of the valve sleeve 1 is transitionally matched with the inner wall of the sleeve 2. Since the sleeve 2 is a thin-walled stretched part, the fixing sleeve 201 is rolled upward to fix the valve sleeve 1, and the fixing sleeve 201 is matched with the fixing protrusion 104 to fix the valve sleeve 1.

[0062] It is worth mentioning that the bottom of the limiting block 6 contacts and cooperates with the inner protrusion 202 to achieve the limiting effect on the moving iron core 5 .

[0063] As attached Figure 7 To Attachment Fig. 9 As shown, a first breathing hole 501 is opened on the top of the moving iron core 5 , and the first breathing hole 501 is connected to the inner groove 502 .

[0064] In the above technical solution, through the design of the first breathing hole 501 , when the moving iron core 5 moves, the first breathing hole 501 is used to balance the air pressure on both sides of the moving iron core 5 .

[0065] As attached Figure 8 To Attachment Fig.11 As shown, an annular groove 503 is provided on the bottom inner wall of the moving iron core 5, and a limiting protrusion 603 is provided on the bottom outer wall of the limiting block 6, and the limiting protrusion 603 matches the annular groove 503; a side opening 601 is provided on the side wall of the limiting block 6, and a lower opening 602 is provided on the bottom of the limiting block 6, and the lower opening 602 is located on the side close to the limiting protrusion 603.

[0066] In the above technical solution, through the design of the limiting protrusion 603 and the annular groove 503, the limiting protrusion 603 cooperates with the annular groove 503 to limit the limiting block 6, and the side opening 601 and the lower opening 602 play the role of reducing mass and gas circulation.

[0067] As attached Fig.12 As shown, the outer wall of the fixed iron core 9 is provided with a second breathing hole 902, and there are two second breathing holes 902, which are respectively located on both sides of the center hole 901;

[0068] In the above technical solution, a second breathing hole 902 is opened on the outer wall of the fixed iron core 9 , and the second breathing hole 902 is used to balance the air pressure on both sides of the fixed iron core 9 .

[0069] As attached Fig.13 As shown, the fixed iron core 9 is provided with a chamfer at the center hole 901 , and the chamfer is located at the top of the center hole 901 .

[0070] In the above technical solution, by providing a chamfer at the top of the center hole 901, the assembly of the push rod assembly 8 and the fixed iron core 9 is facilitated, thereby reducing the difficulty of assembling the entire valve.

[0071] As attached Fig.17 As shown, a positioning block 301 is provided at the bottom of the coil skeleton 3, and the positioning block 301 is integrally formed with the coil skeleton 3. A positioning hole 401 matching the positioning block 301 is provided at the bottom of the magnetic cover 4, and the positioning block 301 is mutually socketed with the magnetic cover 4 through the positioning hole 401; a through hole 402 is provided at the bottom of the magnetic cover 4, and the sleeve 2 extends through the through hole 402 to the outside of the magnetic cover 4, and the sleeve 2 is interference fit with the magnetic cover 4 through the through hole 402.

[0072] In the above technical solution, the design of the positioning block 301 and the positioning hole 401 facilitates the assembly of the magnetic cover 4 and the coil skeleton 3, thereby reducing the difficulty of assembling the entire valve.

[0073] As attached Figure 1 As shown, a magnetic gasket 12 is fixedly sleeved on the top outer wall of the coil skeleton 3 , and the magnetic gasket 12 is located above the magnetic cover 4 .

[0074] The specific usage and function of this embodiment are as follows:

[0075] When assembling the present invention, the coil 11 is firstly wound around the outside of the coil frame 3, the contact terminal 13 is installed at the bottom of the coil frame 3, and then the magnetic cover 4 is assembled on the outside of the coil frame 3 through the positioning hole 401 at the bottom of the magnetic cover 4 and the positioning block 301 at the bottom of the coil frame 3, and the magnetic cover 4 is fitted with the magnetic gasket 12 on the upper part of the coil frame 3;

[0076] Then, the sleeve 2 is inserted into the coil frame 3, and the sleeve 2 is interference-fitted with the bottom through hole 402 of the magnetic cover 4, and the bottom of the sleeve 2 extends to the outside of the magnetic cover 4, and the top of the sleeve 2 is mechanically limited with the upper end surface of the coil frame 3;

[0077] Secondly, the limit block 6 is installed into the moving iron core 5, and fixed by the limit protrusion 603 and the annular groove 503, and then the moving iron core 5 is placed into the assembled sleeve 2; and then the fixed iron core 9 is pressed into the designated position in the sleeve 2;

[0078] Place the push rod assembly 8 along the central hole 901 in the middle of the fixed iron core 9, so that the push rod assembly 8 contacts the upper surface of the moving iron core 5 under the action of gravity; then place the spring 10 on the top of the push rod assembly 8, and the spring 10 and the sealing rubber assembly 7 are sleeved with each other;

[0079] Then, the valve sleeve 1 is inserted into the sleeve 2, and the valve sleeve 1 and the sleeve 2 are transitionally matched to the mechanical limit, and at the same time, the upper end of the spring 10 is inserted into the limit groove 105 at the bottom of the valve sleeve 1; finally, the fixing sleeve 201 is crimped to complete the fixing of the valve sleeve 1, that is, the fixing sleeve 201 is matched with the fixing protrusion 104 to complete the fixing of the valve sleeve 1;

[0080] Finally, the sealing ring 14 is inserted into the groove 103 outside the valve sleeve 1.

[0081] For the above structure and process, please refer to Figure 1-17 .

[0082] When the present invention is used, when the pneumatic control valve is not powered, the coil 11 is not excited, and the elastic force of the spring 10 pushes the push rod assembly 8 and the moving iron core 5 to the limit position. At this time, the pneumatic control valve is in the initial position, and the first valve port 101 is in a normally open state;

[0083] When the pneumatic control valve is powered on, the coil 11 applies a certain excitation, the moving iron core 5 moves upward under the electromagnetic force, the moving iron core 5 pushes the push rod assembly 8 to move upward, the push rod assembly 8 drives the sealing rubber assembly 7 to move upward, and the sealing rubber assembly 7 seals the first valve port 101; when the coil 11 loses the excitation, the electromagnetic force disappears, the push rod assembly 8 is reset by the elastic force of the spring 10 and the pressure of the first valve port 101 moves downward, as shown in the attached figure. Fig.18 As shown, the pressure at the P port is downward, and the first valve port 101 is opened, and the gas flows from the first valve port 101 to the second valve port 102. Fig.18 As shown, the gas flows from port P to port A.

[0084] For the above structure and process, please refer to Figure 1-18 .

[0085] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pneumatic control valve for a commercial vehicle transmission brake, comprising a valve sleeve (1), characterized in that: A first valve opening (101) is provided in the middle of the valve sleeve (1), a second valve opening (102) is provided on the outer side of the valve sleeve (1), a sleeve (2) is fixedly sleeved on the outer wall of the valve sleeve (1), a coil frame (3) is fixedly sleeved on the outer wall of the sleeve (2), a coil (11) is sleeved on the outer wall of the coil frame (3), a magnetic cover (4) is fixedly sleeved on the outer wall of the coil frame (3), the coil (11) is located on the inner side of the magnetic cover (4), a contact terminal (13) is fixedly mounted on the outer wall of the bottom of the coil frame (3), a moving iron core (5) is slidably sleeved on the bottom of the sleeve (2), an inner groove (502) is provided on the bottom of the moving iron core (5), and the The moving iron core (5) is located in the inner groove (502) and is fixedly sleeved with a limit block (6); the inner wall of the sleeve (2) is fixedly sleeved with a fixed iron core (9); the fixed iron core (9) is located directly above the moving iron core (5); a center hole (901) is opened in the middle of the fixed iron core (9); a push rod assembly (8) is slidably sleeved on the fixed iron core (9) at the center hole (901); the bottom end of the push rod assembly (8) is in contact with the outer wall of the moving iron core (5); the top of the push rod assembly (8) is fixedly connected with a sealing rubber assembly (7); the sealing rubber assembly (7) corresponds to the first valve port (101); and the outer wall of the sealing rubber assembly (7) is sleeved with a spring (10); A first breathing hole (501) is provided on the top of the moving iron core (5), and the first breathing hole (501) is connected to the inner groove (502); An annular groove (503) is provided on the bottom inner wall of the moving iron core (5), and a limiting protrusion (603) is provided on the bottom outer wall of the limiting block (6), wherein the limiting protrusion (603) matches the annular groove (503); A side opening (601) is formed on the side wall of the limiting block (6), and a lower opening (602) is formed on the bottom of the limiting block (6), wherein the lower opening (602) is located on a side close to the limiting protrusion (603); The bottom of the sleeve (2) is provided with an inner protrusion (202), and the bottom of the limit block (6) is in contact with and fits with the inner protrusion (202).

2. A commercial vehicle transmission brake pneumatic control valve according to claim 1, characterized in that: The push rod assembly (8) comprises a push rod (801), the push rod (801) being slidably sleeved with the fixed iron core (9) through a central hole (901), a connecting plate (802) being fixedly connected to the top of the push rod (801), and a connecting hole (803) being formed on an outer wall of the connecting plate (802); The sealing rubber assembly (7) comprises a rubber sheet (701), the lower surface of the rubber sheet (701) is fixedly connected to a rubber column (702), the rubber column (702) is sleeved with a connecting plate (802) via a connecting hole (803), one end of the rubber column (702) is fixedly connected to a rubber ring (703), the rubber sheet (701) is located directly above the connecting plate (802), the rubber ring (703) is located directly below the connecting plate (802), and the push rod (801) and the rubber ring (703) are sleeved with each other.

3. A commercial vehicle transmission brake pneumatic control valve according to claim 2, characterized in that: The spring (10) and the rubber sheet (701) are sleeved together, the diameter of the connecting plate (802) is larger than the diameter of the rubber sheet (701), and the bottom of the spring (10) is in contact with the outer wall of the connecting plate (802); A limiting groove (105) is provided at the bottom of the valve sleeve (1), and the top of the spring (10) extends into the limiting groove (105).

4. A commercial vehicle transmission brake pneumatic control valve according to claim 1, characterized in that: A clamping groove (103) is provided on the top outer wall of the valve sleeve (1), and a sealing ring (14) is fixedly sleeved on the valve sleeve (1) at the clamping groove (103).

5. The pneumatic control valve for a commercial vehicle transmission brake according to claim 1, characterized in that: The outer wall of the valve sleeve (1) is provided with a fixing protrusion (104), the valve sleeve (1) and the fixing protrusion (104) are integrally formed, the top of the sleeve (2) is provided with a fixing cylinder (201) matching the fixing protrusion (104), the fixing cylinder (201) and the sleeve (2) are integrally formed, and the fixing protrusion (104) and the fixing cylinder (201) are sleeved with each other; The inner protrusion (202) and the sleeve (2) are integrally formed, and the sleeve (2) is a thin-walled stretched part.

6. A commercial vehicle transmission brake pneumatic control valve according to claim 1, characterized in that: The outer wall of the fixed iron core (9) is provided with a second breathing hole (902), and there are two second breathing holes (902), which are respectively located on both sides of the central hole (901); The fixed iron core (9) is provided with a chamfer at the center hole (901), and the chamfer is located at the top of the center hole (901).

7. A commercial vehicle transmission brake pneumatic control valve according to claim 1, characterized in that: A positioning block (301) is provided at the bottom of the coil frame (3), the positioning block (301) and the coil frame (3) are integrally formed, a positioning hole (401) matching the positioning block (301) is provided at the bottom of the magnetic cover (4), and the positioning block (301) and the magnetic cover (4) are mutually sleeved through the positioning hole (401); A through hole (402) is provided at the bottom of the magnetic cover (4), the sleeve (2) passes through the through hole (402) and extends to the outside of the magnetic cover (4), and the sleeve (2) is interference-fitted with the magnetic cover (4) through the through hole (402).

8. The commercial vehicle transmission brake pneumatic control valve according to claim 1, characterized in that: A magnetic gasket (12) is fixedly sleeved on the top outer wall of the coil frame (3), and the magnetic gasket (12) is located above the magnetic cover (4).

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