Internal combustion engine waste gas control valve

Abstract

The utility model relates to the field of internal combustion engine air intake and exhaust gas recirculation, and discloses an internal combustion engine exhaust gas control valve. The protective cover or the shell is provided with the breathing piece communicated with external air and the cam chamber, a traditional breathing opening is replaced, the function of balancing internal and external pressure is achieved, the air can enter and exit through the breathing piece, a breathable film is arranged in the breathing piece so that water and pollutants can enter the cam chamber, and the probability of corrosion and clamping stagnation is effectively reduced; recycled waste gas of an internal combustion engine is prevented from entering the cam chamber through the design of the sealing piece, so that corrosion and clamping stagnation caused by condensate water formed by the waste gas in the cam chamber and harmful gas and particulate matter in the waste gas are avoided, the waste gas discharging hole communicated with the outside is additionally formed, and the waste gas generated when the transmission shaft reciprocates is discharged in time; and the reset spring is arranged to eliminate the situation that the actual opening degree of the valve is inconsistent with the output of the motor position sensor due to mechanical clearance of a traditional torsional spring, so that the control response of the valve is more timely and accurate.

Description

Technical Field

[0001] The utility model relates to the field of air intake and exhaust gas recirculation of an internal combustion engine, and in particular to an exhaust gas control valve of an internal combustion engine. Background Art

[0002] To meet the National VI emission standard's requirements for reducing nitrogen oxides, gas internal combustion engines utilize stoichiometric combustion, single-point premixing, and exhaust gas recirculation (EGR). To achieve this, a portion of the engine's exhaust gas is cooled and recirculated into the combustion chamber, effectively lowering combustion temperatures and significantly reducing nitrogen oxide production while also minimizing the likelihood of engine knock. The exhaust gas control valve controls the amount of recirculated exhaust gas entering the mixer. The control valve opens to the required degree based on a drive signal from the engine controller, thereby controlling the proportion of exhaust gas entering the mixer and ensuring optimal combustion of the resulting mixed gas entering the combustion chamber.

[0003] The exhaust gas generated by gas internal combustion engines contains large amounts of water vapor and other pollutants. Due to fluctuations in exhaust gas pressure within the valve cavity and the reciprocating motion of the valve core shaft, exhaust gas can easily enter the cam chamber at the motor output end through the gap in the guide bearing, forming condensed water and dirt. These pollutants and condensed water can cause corrosion and seizure of components. Simultaneously, the torque motor's output shaft rotates the cam, which in turn drives the bearings on the output shaft to convert rotational motion into axial motion of the valve core shaft. The torque motor's internal sensor transmits the cam's angle signal to the control unit, which determines and calculates the valve opening based on the sensor signal. Due to the gap between the cam and the driven bearing, the valve has a detent when switching direction, resulting in inaccurate position determination.

[0004] The cam chamber has an internal volume change due to the reciprocating motion of the core shaft. In order to balance the internal and external air pressures and remove the accumulated water in the cam chamber, a breathing port connected to the external air is traditionally opened in the cam chamber. Although this can be used to balance the internal and external air pressures and remove the accumulated water in the cam chamber, water and dust from the outside can also enter the cam chamber through this channel, causing corrosion of the components in the cam chamber, thereby causing movement jamming and functional failure. Utility Model Content

[0005] The purpose of the utility model is to provide an internal combustion engine exhaust gas control valve to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] An internal combustion engine exhaust control valve, comprising:

[0008] A protective cover and a housing that cooperates therewith, the two forming a cam chamber after being assembled;

[0009] The protective cover or the housing is provided with a breathing piece for connecting the external air and the cam chamber, and a breathable membrane is provided in the breathing piece to prevent water and pollutants from entering the cam chamber.

[0010] As a preferred solution of the present invention, the breathing piece includes:

[0011] A boss is provided on the outside of the protective cover, and at least four side blocks are provided on the boss, and each of the side blocks is disconnected between adjacent ones. An intermediate block is provided at the middle position after the side blocks are enclosed. The intermediate block is a square structure, and a circulation space is provided inside it, and a breathing port is provided on each end face. A circulation channel connected to the circulation space and the breathing port is provided in the protective cover.

[0012] As a preferred solution of the present invention, the breathing port corresponds to each of the side baffles.

[0013] As a preferred solution of the present invention, an annular protrusion is provided inside the protective cover, the interior of the annular protrusion is enclosed to form a step, and the breathable membrane is adhered to the step.

[0014] As a preferred solution of the present invention, the breathing piece further includes:

[0015] A mounting base is arranged on one side of the shell, and the mounting base includes a tube base extending into the shell, and a base located outside the shell. The base is provided with an annular end, and the annular end is provided with waist holes distributed in a ring shape. A through hole connected to the waist hole is provided at the middle position of the mounting base, and a pressure cover is provided on the annular end.

[0016] As a preferred solution of the present invention, after the annular end portion is assembled with the gland, the bottom of the gland is higher than the top of the waist hole;

[0017] A breathable membrane covering the through hole is placed in the annular end portion.

[0018] As a preferred solution of the present invention, a sealing ring is provided at the connection between the base and the tube seat, and one end surface of the base is pressed against the sealing ring and is closely attached to the shell.

[0019] As a preferred solution of the present utility model, a driving motor is provided on the shell, the output end of which extends into the cam chamber and is connected to a transmission cam, an arc-shaped groove is provided on the transmission cam, and a movable transmission wheel is provided on the arc-shaped groove. The transmission wheel is provided on the transmission shaft, and the transmission shaft is provided with a valve body connected to the shell, and a valve plate cooperating with the valve body.

[0020] As a preferred solution of the present invention, a guide bearing is provided between the valve body and the transmission shaft, and sealing members are provided at the upper and lower ends of the guide bearing.

[0021] As a preferred solution of the present invention, the sealing member includes: an upper sealing ring and a lower sealing ring provided at both ends of the guide bearing, and the valve body is provided with a first elastic member surrounding the lower sealing ring and pressing the lower sealing ring;

[0022] A second elastic member for pressing the upper sealing ring is provided between the guide bearing and the valve body, and a spring blocking piece is located in the valve body and sleeved on the transmission shaft, and the spring blocking piece is pressed on the second elastic member and the upper sealing ring.

[0023] As a preferred solution of the present invention, the sealing member further comprises: a lip shaft sealing ring and a lower sealing ring provided at both ends of the guide bearing, the lip shaft sealing ring being in close contact with the transmission shaft; a spring blocking piece located in the housing and sleeved on the transmission shaft, the spring blocking piece pressing on the lip shaft sealing ring;

[0024] The valve body is provided with a first elastic member which surrounds the lower sealing ring and presses the lower sealing ring.

[0025] As a preferred solution of the present invention, a spring seat is provided at one end of the transmission shaft with the transmission wheel, and a return spring is sleeved on the transmission shaft. One side of the return spring rests on the spring block, and the other side rests on the spring seat at the end of the transmission wheel through a gasket, so that the transmission wheel is close to the inner wall of the arc groove.

[0026] As a preferred solution of the present invention, an exhaust gas discharge hole is provided in the shell, one end of which is connected to the external air, and the other end is located between the valve body and the shell.

[0027] The utility model has the following beneficial effects: the breathing piece arranged on the protective cover or the shell replaces the traditional breathing port, which not only balances the internal and external pressures, but also allows entry and exit through the breathing piece. At the same time, the setting of the breathable membrane prevents pollutants such as particulate matter, water and other liquids from entering the cam chamber, effectively reducing the chance of corrosion and jamming.

[0028] Furthermore, the seal design prevents recirculated exhaust gas from the internal combustion engine from entering the cam chamber, thereby preventing condensation and the formation of harmful gases and particulate matter in the exhaust gas, which can cause corrosion and stagnation. Furthermore, an exhaust gas drain hole connected to the outside world allows for the timely discharge of exhaust gas during the reciprocating motion of the drive shaft.

[0029] The setting of the return spring ensures that the transmission wheel always sticks to the inner side of the transmission cam, eliminating the inconsistency between the actual valve opening and the output of the motor position sensor caused by the traditional torsion spring mechanical virtual position, thereby making the valve control response more timely and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a structural schematic diagram of the interior of the cam chamber and the breathing port in the prior art of the present utility model.

[0032] Figure 2 It is a schematic cross-sectional view of the prior art structure of the present utility model.

[0033] Figure 3 This is a structural schematic diagram of the breathing component of the present invention installed on the protective cover.

[0034] Figure 4 This is a structural schematic diagram of the breathing component of the present invention installed on the housing.

[0035] Figure 5 This is a front structural diagram of the breathing component installed on the protective cover of the present invention.

[0036] Figure 6 This is a schematic diagram of the reverse structure of the breathing component installed on the protective cover of the present invention.

[0037] Figure 7 This is a schematic structural diagram of the cooperation between the breathing piece installed on the protective cover and the breathable membrane of the present invention.

[0038] Figure 8 This is a schematic diagram of the overall structure of the breathing component installed on the shell of the present invention.

[0039] Figure 9 This is a schematic cross-sectional view of the breathing component installed on the housing of the present invention.

[0040] Figure 10 This is a schematic diagram of the cross-sectional structure of a sealing member in one embodiment of the present invention.

[0041] Figure 11 This is a schematic diagram of the cross-sectional structure of a sealing member in another embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1. Torque motor; 11. Cam; 12. Valve core shaft; 13. Follower bearing; 14. Valve disc; 15. Cam chamber; 16. Breathing port; 17. Guide bearing; 18. Torsion spring; 21. Protective cover; 22. Housing; 23. Cam chamber; 24. Breathing element; 241. Boss; 242. Side stop; 243. Intermediate stop; 244. Breathing port; 245. Flow space; 246. Flow channel; 247. Annular protrusion; 248. Step; 249. Breathing membrane; 25. Breathing element; 251. Mounting base; 2511. Base; 2512. Pipe seat; 252. Annular end; 253. Waist hole; 254. Through hole; 255. Pressure cover; 256. Sealing ring; 257. Breathable membrane; 26. Driving motor; 27. Transmission cam; 271. Arc groove; 28. Transmission wheel; 29. ​​Transmission shaft; 30. Guide bearing; 31. Valve body; 32. Valve plate; 33. Lip shaft sealing ring; 34. Lower sealing ring; 35. First elastic member; 36. Upper sealing ring; 37. Second elastic member; 38. Spring stopper; 39. Return spring; 40. Gasket; 41. Spring seat; 42. Exhaust gas discharge hole; 43. Spring stopper. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] See Figure 1 and 2 As shown, current gas-fired internal combustion engines, including those powered by clean energy sources such as natural gas, biogas, petroleum gas, or methanol, as well as fuel-fired internal combustion engines and all reciprocating internal combustion engines, typically use a poppet valve to control the amount of exhaust gas entering the system. The output shaft of torque motor 1 rotates cam 11, which, via a follower bearing 13 at the end of valve shaft 12, converts this rotational motion into linear motion, controlling the opening of valve plate 14 and, consequently, the EGR flow rate.

[0046] Among them, a breathing port 16 connected to the external air is opened in the cam chamber 15. Although it can be used to balance the internal and external air pressure and remove the accumulated water in the cam chamber 15, water and dust from the outside can also enter the cam chamber 15 through this channel, causing corrosion of the internal components of the cam chamber 15, thereby causing movement jamming and functional failure.

[0047] In the valve cavity, due to the movement of the control valve, the exhaust gas can easily enter the cam chamber 15 through the gap of the guide bearing 17. In addition, the exhaust gas generated by gas internal combustion engines, oil internal combustion engines and all reciprocating internal combustion engines contains a large amount of water vapor and other pollutants to form condensed water and dirt. The pollutants and condensed water will cause corrosion and seizure of parts.

[0048] Due to the gap between the cam 11 and the driven driven bearing 13, the internal sensor of the torque motor 1 cannot transmit the angle signal of the cam 11 to the control unit only through the setting of the torsion spring 18, and the control unit cannot determine and calculate the valve opening based on the sensor signal, so that the valve has a virtual position when the movement direction is changed, resulting in inaccurate position judgment.

[0049] To solve the above problems, see Figures 3 to 11 As shown, the utility model provides an internal combustion engine exhaust control valve, which can be used on gas internal combustion engines, oil internal combustion engines and all reciprocating internal combustion engines. It specifically includes: a protective cover 21, which is matched with a shell 22. The protective cover 21 is set at an angle and is made of plastic material, which reduces the manufacturing cost. After the two are assembled, a cam chamber 23 is formed, and a sealing strip can be provided at the connection between the two to maintain good sealing performance of the cam chamber 23.

[0050] The protective cover 21 or the housing 22 is provided with breathing parts 25 and 24 that connect the external air and the cam chamber 23 . Breathable membranes 257 and 249 are provided in the breathing parts 25 and 24 to prevent water and pollutants from entering the cam chamber 23 .

[0051] By arranging breathing parts 25 and 24 on the protective cover 21 or the shell 22, the traditional breathing port 16 is replaced, which not only plays a role in balancing the internal and external pressures, but also the arrangement of the breathable membranes 257 and 249 prevents pollutants such as particulate matter, water and other liquids from entering the cam chamber 23, effectively reducing the chance of corrosion and jamming.

[0052] In some embodiments, the breathing member 24 includes a boss 241 disposed on the exterior of the protective cover 21, with at least four side baffles 242 disposed on the boss 241, or a distribution structure designed according to actual needs. Each side baffle 242 is disconnected from adjacent ones, allowing for more even gas dispersion, reducing localized concentration, and ensuring air circulation. An intermediate baffle 243 is disposed in the middle of the enclosed side baffles 242. The intermediate baffle 243 has a square or polygonal structure, and defines a circulation space 245 therein. A breathing port 244 is defined on each end face. A circulation channel 246 is defined within the protective cover 21, communicating with the circulation space 245 and the breathing port 244.

[0053] The side stop 242 is enclosed on one side of the middle stop 243, thereby preventing dust, liquid or pollutants from easily entering the breathing port 244, that is, entering the cam chamber 23, thereby reducing damage to the equipment.

[0054] Among them, the breathing port 244 corresponds to each side block 242. Since the side block 242 is set in a disconnected manner, it is not only conducive to the circulation of gas, but also can prevent the gaps between adjacent side blocks 242 from facing the breathing port 244, preventing debris or water from directly entering the breathing port 244, causing serious blockage and even requiring frequent maintenance.

[0055] An annular protrusion 247 is provided inside the protective cover 21. The interior of the annular protrusion 247 encloses a step 248, to which a breathable membrane 249 is attached. The design of the breathable membrane 249 allows air to pass through, maintaining stable pressure within the cam chamber 23 while preventing the ingress of moisture and dirt, ensuring proper operation and extending the lifespan of the device. The breathable membrane 249 can be ultrasonically welded or directly attached to the step 248, depending on the needs. This also facilitates installation and replacement of the breathable membrane 249, reducing maintenance difficulty and costs.

[0056] In another embodiment, the respiratory part 25 also includes: a mounting base 251 arranged on one side of the shell 22, the mounting base 251 includes a tube base 2512 extending into the shell 22, and a base 2511 located outside the shell 22, the base 2511 is provided with an annular end 252, the annular end 252 is provided with waist holes 253 distributed in a ring shape, a through hole 254 connected to the waist hole 253 is provided at the middle position of the mounting base 251, and a pressure cover 255 is provided on the annular end 252.

[0057] In the above description, the tube base 2512 is threadedly connected to the housing 22 or directly fixed to the housing 22, and a sealing ring 256 is provided at the connection between the base 2511 and the tube base 2512. When the tube base 2512 is installed in the housing 22, one end surface of the base 2511 presses the sealing ring 256 and abuts against the housing 22 to maintain a seal. The gland 255 is screwed onto the annular end 252 for assembly, or other convenient assembly and disassembly methods, such as a snap-fit ​​method. After the annular end 252 and the gland 255 are assembled, the bottom of the gland 255 is higher than the top of the waist hole 253 to better allow gas to enter through the waist hole 253 and ensure stable air pressure in the cam chamber 23. A breathable membrane 257 is placed inside the annular end 252 to block the through hole 254. The breathable membrane 257 has the same effect as in the above embodiment. At this time, it is only necessary to disassemble the pressure cover 255 to replace the breathable membrane 257, which is very convenient and quick.

[0058] In addition, a drive motor 26 is provided on the housing 22, the output end of which extends into the cam chamber 23 and is connected to a transmission cam 27. The transmission cam 27 has an arcuate slot 271, and a movable transmission wheel 28 is provided on the arcuate slot 271. The transmission wheel 28 is mounted on a transmission shaft 29. The transmission shaft 29 is sleeved with a valve body 31 connected to the housing 22 and a valve plate 32 that cooperates with the valve body 31. The principle by which the transmission cam 27 drives the transmission shaft 29 to move axially is the same as that of the prior art and will not be elaborated on here.

[0059] A guide bearing 30 is provided between the valve body 31 and the drive shaft 29, with seals located at the upper and lower ends of the guide bearing 30. The seals prevent exhaust gas recirculated from the internal combustion engine from entering the cam chamber 23, thereby preventing the formation of condensed water in the cam chamber 23 and the formation of harmful gases and particulate matter in the exhaust gas, which could cause corrosion and seizure of the equipment.

[0060] Specifically, in some embodiments, the seal includes: an upper seal ring 36 and a lower seal ring 34 provided at both ends of the guide bearing 30 , and a first elastic member 35 is provided on the valve body 31 to surround the lower seal ring 34 and squeeze the lower seal ring 34 .

[0061] A second elastic member 37 is provided between the guide bearing 30 and the valve body 31 to squeeze the upper sealing ring 36 . A spring block 38 is located in the valve body 31 and sleeved on the transmission shaft 29 . The spring block 38 presses on the second elastic member 37 and the upper sealing ring 36 .

[0062] The internal upper and lower sealing rings 36 and 34, along with the forces exerted on them by the first and second elastic members 35 and 37, keep the two rings in close contact with the drive shaft 29. This reduces the amount of exhaust gas that enters the cam chamber 23 through the gap between the guide bearing 30 and the drive shaft 29, preventing the formation of condensed water, harmful gases, and particulate matter in the cam chamber 23, which could cause corrosion and seizure. The spring retainer 38 limits the upper sealing ring 36, further improving the sealing performance between the upper sealing ring 36 and the drive shaft 29.

[0063] In another embodiment, the seal also includes: a lip shaft seal ring 33 and a lower seal ring 34 arranged at both ends of the guide bearing 30, the lip shaft seal ring 33 is tightly attached to the transmission shaft 29; a spring baffle 43 is located in the housing 22 and sleeved on the transmission shaft 29, the spring baffle 43 is pressed against the lip shaft seal ring 33, and a first elastic member 35 is provided on the valve body 31, which surrounds the lower seal ring 34 and squeezes the lower seal ring 34.

[0064] The cooperation between the lower sealing ring 34 and the first elastic member 35 is based on the same principle as described above. The cooperation between the lip shaft sealing ring 33 and the transmission shaft 29 is achieved by friction generated between the transmission shaft 29 and the lip shaft sealing ring 33 due to the axial movement of the transmission shaft 29, thereby achieving a seal. The lip shaft sealing ring 33 is a prior art and the principle will not be described in detail here.

[0065] In addition, a spring seat 41 is provided at one end of the transmission shaft 29, which carries the transmission wheel 28. A return spring 39 is sleeved on the transmission shaft 29. One side of the return spring 39 abuts against spring retainers 38 and 43, and the other side abuts against the spring seat 41 at the end of the transmission wheel 28 via a gasket 40, thereby keeping the transmission wheel 28 in close contact with the inner wall of the arcuate groove 271. The provision of the return spring 39 ensures that the transmission wheel 28 always abuts against the inner side of the transmission cam 27, eliminating the discrepancy between the actual valve opening and the output of the motor position sensor caused by the detent position of traditional torsion spring mechanisms, thereby ensuring more timely and accurate valve control response.

[0066] In addition, an exhaust gas discharge hole 42 is provided in the housing 22, one end of which is connected to the external gas, and the other end is located between the valve body 31 and the housing 22, that is, between the guide bearing 30 and the seal, so as to effectively discharge the exhaust gas that may pass through the bearing, while preventing the exhaust gas from entering the cam chamber 23, and timely discharge the exhaust gas during the reciprocating motion of the transmission shaft 29.

[0067] Due to the above structure, the design of the drain port is reduced, water accumulation in the cam chamber 23 is avoided, the installation direction restrictions of the exhaust gas circulation control valve are reduced, and the layout freedom of the control valve and the EGRM mixer is increased.

[0068] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An internal combustion engine exhaust gas control valve, characterized in that: include: A protective cover and a housing that cooperates therewith, the two forming a cam chamber after being assembled; The protective cover or the housing is provided with a breathing piece for connecting the external air and the cam chamber, and a breathable membrane is provided in the breathing piece to prevent water and pollutants from entering the cam chamber.

2. The exhaust gas control valve for an internal combustion engine according to claim 1, characterized in that: The breathing piece includes: A boss is provided on the outside of the protective cover, and at least four side blocks are provided on the boss, and each of the side blocks is disconnected between adjacent ones. An intermediate block is provided at the middle position after the side blocks are enclosed. The intermediate block is a square structure, and a circulation space is provided inside it, and a breathing port is provided on each end face. A circulation channel connected to the circulation space and the breathing port is provided in the protective cover.

3. The exhaust gas control valve for an internal combustion engine according to claim 2, characterized in that: The breathing port corresponds to each of the side guards.

4. The exhaust gas control valve for an internal combustion engine according to claim 2, wherein: An annular protrusion is provided inside the protective cover, and a step is formed by enclosing the inside of the annular protrusion, and the breathable membrane is adhered to the step.

5. The exhaust gas control valve for an internal combustion engine according to claim 1, wherein: The breathing piece further comprises: A mounting base is arranged on one side of the shell, and the mounting base includes a tube base extending into the shell, and a base located outside the shell. The base is provided with an annular end, and the annular end is provided with waist holes distributed in a ring shape. A through hole connected to the waist hole is provided at the middle position of the mounting base, and a pressure cover is provided on the annular end.

6. The exhaust gas control valve for an internal combustion engine according to claim 5, characterized in that: After the annular end portion is assembled with the gland, the bottom of the gland is higher than the top of the waist hole; A breathable membrane covering the through hole is placed in the annular end portion.

7. The exhaust gas control valve for an internal combustion engine according to claim 5, characterized in that: A sealing ring is provided at the connection between the base and the tube seat, and one end surface of the base is pressed against the sealing ring and is closely attached to the shell.

8. The exhaust gas control valve for an internal combustion engine according to claim 1, wherein: A driving motor is provided on the shell, the output end of which extends into the cam chamber and is connected to a transmission cam. An arc groove is provided on the transmission cam, and a movable transmission wheel is provided on the arc groove. The transmission wheel is provided on a transmission shaft, and a valve body connected to the shell and a valve plate cooperating with the valve body are sleeved on the transmission shaft.

9. The exhaust gas control valve for an internal combustion engine according to claim 8, characterized in that: A guide bearing is provided between the valve body and the transmission shaft, and sealing members are provided at the upper and lower ends of the guide bearing.

10. The exhaust gas control valve for an internal combustion engine according to claim 9, characterized in that: The sealing member comprises an upper sealing ring and a lower sealing ring provided at both ends of the guide bearing, and the valve body is provided with a first elastic member surrounding the lower sealing ring and pressing the lower sealing ring; A second elastic member for pressing the upper sealing ring is provided between the guide bearing and the valve body, and a spring blocking piece is located in the valve body and sleeved on the transmission shaft, and the spring blocking piece is pressed on the second elastic member and the upper sealing ring.

11. The exhaust gas control valve for an internal combustion engine according to claim 9, wherein: The sealing member further comprises: a lip shaft sealing ring and a lower sealing ring provided at both ends of the guide bearing, the lip shaft sealing ring being in close contact with the transmission shaft; a spring blocking piece located in the housing and sleeved on the transmission shaft, the spring blocking piece pressing on the lip shaft sealing ring; The valve body is provided with a first elastic member which surrounds the lower sealing ring and presses the lower sealing ring.

12. The exhaust gas control valve for an internal combustion engine according to any one of claims 10 or 11, characterized in that: A spring seat is provided on one end of the transmission shaft with the transmission wheel, and a return spring is sleeved on the transmission shaft. One side of the return spring rests on the spring block, and the other side rests on the spring seat at the end of the transmission wheel through a gasket, so that the transmission wheel is close to the inner wall of the arc groove.

13. The exhaust gas control valve for an internal combustion engine according to claim 8, characterized in that: An exhaust gas discharge hole is provided in the shell, one end of which is connected to the external air, and the other end is located between the valve body and the shell.

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