Plastic EGR valve device

Abstract

The utility model relates to a plastic EGR valve device which comprises a plastic cover plate, a valve body assembly, an ejector rod shaft, a valve bowl, two O-shaped rings, a plastic lining, an ejector rod support, a metal shaft, a transmission gear, a deep groove ball bearing and a motor, the valve body assembly is an insert injection molding part, the plastic cover plate is installed on the valve body assembly, one end of the ejector rod shaft is fixedly connected with a metal insert of the ejector rod support, and the other end of the ejector rod shaft is fixedly connected with the valve bowl. One end of the ejector rod shaft is fixedly connected with the valve bowl and penetrates through the sliding bush, the two O-shaped rings and the plastic bush of the valve body assembly, the other end of the ejector rod shaft is fixedly connected with the valve bowl, the plastic bush is installed between the two O-shaped rings, the ejector rod support is fixedly connected with the ejector rod shaft, and the metal shaft is installed on the ejector rod support in a pressing mode. By the adoption of the plastic EGR valve device, the corrosion resistance can be improved, the service life can be prolonged, the reliability of the EGR valve in the life cycle is guaranteed, and the reliability of an EGR system is improved; subsequent assembly procedures are reduced, the production efficiency is high, the production cost is low, and the product cost performance is improved; and the lightweight design of the whole vehicle is realized, and remarkable technical and economic advantages are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of EGR device, especially the field of EGR valve, specifically refers to a kind of plastic EGR valve device. BACKGROUND

[0002] As an important means of controlling nitrogen oxides (NOx) emissions, the exhaust gas recirculation (EGR) technology has been widely used in the field of gasoline vehicles, especially in hybrid passenger cars. The EGR system can reduce the temperature of the combustion chamber and reduce the generation of NOx by re-introducing part of the exhaust gas into the intake system. At the same time, EGR technology also has a positive impact on the fuel economy of the engine, especially under partial load conditions. By reducing the pumping loss and optimizing the combustion process, EGR can improve fuel efficiency and further meet the stringent emission regulations (such as Euro 6, 7 of the European Union and China's national six B standards) and market demand for energy saving and environmental protection.

[0003] The EGR valve in the EGR system is a key component that controls the proportion of exhaust gas recirculation, and its performance directly determines the stability and efficiency of the system. There are two types of EGR valves currently, one is a pull-up type EGR valve, and the other is a rotary butterfly valve.

[0004] The pull-up type EGR valve on the market is made of metal material valve body and metal internal components. The pull-up type EGR valve mainly consists of aluminum alloy valve body, drive motor, transmission gear, gear pin, plastic cover plate, top rod support, top rod shaft, valve bowl, valve seat, guide sleeve, plug, sliding bearing, sealing ring, return spring and bearing, all of which are installed on the aluminum alloy valve body. The sliding shaft sleeve is pressed into the valve body shaft sleeve hole by interference; the O-ring has two parts distributed on both sides of the aluminum body shaft sleeve hole, which seals the gear cavity and the shaft sleeve chamber respectively; under the condition of power failure of the motor, the valve bowl can return to the fully closed position under the action of spring force; the motor gear is engaged with the transmission gear, which amplifies the rotation and torque of the motor to the transmission gear, so that the transmission gear has enough torque to drive the cam to overcome the spring pre-pressure and push the top rod out to make the valve bowl away from the valve seat, so that the EGR exhaust gas flows through; the plug is pressed into the aluminum body by interference to ensure that the exhaust gas leakage does not exceed the standard, and the plastic cover plate is installed on the aluminum body gear cavity to ensure the sealing of the gear cavity.

[0005] The existing EGR valve is an aluminum alloy valve body, and the inner assembly is also a metal part. Such materials are widely used in EGR systems due to their high strength and good heat conductivity. However, the operating conditions and operating time of the engine of a hybrid vehicle are quite different from those of a traditional fuel vehicle. The engine of a traditional fuel vehicle needs to work continuously each time it is used, so the EGR valve also works continuously. Even if there is slight corrosion on the metal surface during the parking interval, the surface corrosion can be easily removed by the engine the next time it works, always ensuring the good functional state of the EGR valve. For a hybrid vehicle, due to the driving habits of the driver, the vehicle is basically driven in pure electric mode, and the engine is in a long-term non-working state. Since the EGR valve is usually arranged after the EGR cooler, the exhaust gas contains high humidity and acidic gas after cooling, which combines to form corrosive small droplets. After a few uses of the engine, the acidic components adhere to the surface of the metal part of the EGR valve, especially the acidic gas entering the sliding sleeve inside the valve bowl 7 and the valve seat, which will form a corrosion point on the metal surface. Since the hybrid engine has a low working frequency, the corrosion point will continue to corrode and expand, eventually causing the valve bowl 7 and the valve seat to be corroded and bonded together, so that the EGR valve cannot be opened; when corrosion occurs between the top rod and the sliding sleeve, the EGR valve can be opened, but it cannot return to the fully closed position under the action of the return spring 16, resulting in excessive exhaust gas entering the engine during idling, which causes the engine to stall.

[0006] In addition to the above, the traditional metal EGR valve has the following problems:

[0007] High cost. The existing EGR valve is usually made of aluminum alloy or other metal materials. Aluminum alloy parts need to go through complex processes such as precision casting and machining. The parts on the valve body are installed through press fitting, and the assembly process is complex, which further increases the manufacturing cost. High cost puts pressure on automobile manufacturers, especially for mass-produced hybrid and economy passenger vehicles, which is not conducive to market competition.

[0008] Heavy weight. The density of aluminum alloy is about 2.7 g / cm 3 , and the density of plastic material is usually 1.5 g / cm 3 . The greater the mass, the greater the total mass of the vehicle. It is not conducive to the lightweight design of the vehicle, thereby reducing fuel economy, especially in hybrid and new energy vehicles, which may adversely affect the endurance and energy consumption optimization. Invention content

[0009] The purpose of the present application is to overcome the shortcomings of the prior art and provide a plastic EGR valve device that is simple in structure, low in cost and widely applicable.

[0010] In order to achieve the above-mentioned purpose, the plastic EGR valve device of the present application is as follows:

[0011] The main feature of the plastic EGR valve device is that the device comprises a plastic cover plate, a valve body assembly, a top rod shaft, a valve bowl, two O-rings, a plastic bushing, a top rod support, a metal shaft, a transmission gear, a deep groove ball bearing and a motor. The valve body assembly is an insert injection molding part. The plastic cover plate is installed on the valve body assembly. One end of the top rod shaft is fixedly connected with the metal insert of the top rod support and passes through the sliding bushing, the two O-rings and the plastic bushing of the valve body assembly. The other end of the top rod shaft is fixedly connected with the valve bowl. The plastic bushing is installed between the two O-rings and forms a cavity therebetween. The top rod support is fixedly connected with the top rod shaft. The metal shaft is press-fitted on the top rod support. The deep groove ball bearing is press-fitted on the metal shaft. The plastic cover plate is connected with the motor through motor pins. The transmission gear is engaged with the motor.

[0012] Preferably, the device further comprises a metal bushing and a conical structure. The metal bushing is embedded in the top rod support. The metal bushing is fixedly connected with the top rod shaft. The two sides of the top rod support are respectively provided with the conical structure.

[0013] Preferably, the device further comprises two return springs. The two return springs are respectively installed on the conical structures on the two sides of the top rod support. The return springs are in a compressed state. The return springs cooperate with the conical structures to fix the positions of the return springs on the top rod support. The other sides of the return springs are in contact with the spring cavity walls of the valve body assembly.

[0014] Preferably, the device further comprises a motor flange and a motor gear. The motor flange is fixedly connected with the motor and is installed on the valve body assembly through screws. The outer ring of the motor flange is matched with the motor flange hole on the valve body assembly. The motor gear is fixedly connected with the motor shaft and is engaged with the transmission gear.

[0015] Preferably, the device further comprises an outer cam and an inner cam. The outer cam and the inner cam are arranged on the transmission gear. The deep groove ball bearing is in contact with the outer cam and the inner cam. The outer cam is always in contact with the deep groove ball bearing under the action of the return spring. The outer cam and the inner cam move the deep groove ball bearing by pushing and drive the top rod shaft to open and close the valve bowl.

[0016] Preferably, the device further comprises a stainless steel ring and a sliding bushing. The valve body assembly is wrapped with the stainless steel ring. The sliding bushing is sleeved on the valve body assembly. The valve body assembly comprises a valve seat. The inclined surface of the valve seat is in contact with the valve bowl.

[0017] Preferably, the device further comprises a displacement sensor and a magnet. The displacement sensor is installed on the plastic cover plate. The magnet is installed on the top rod support. The displacement sensor and the magnet constitute an EGR valve displacement detection unit.

[0018] Preferably, the device further comprises a pressure relief hole and a gas permeable membrane, the gas permeable membrane being fixed to the orifice of the pressure relief hole, the pressure relief hole being in communication with the cavity of the plastic bushing.

[0019] Preferably, the device further comprises a wave-shaped spring, the wave-shaped spring being mounted at the bottom of the motor.

[0020] Preferably, the device further comprises a guide sleeve, the guide sleeve being mounted on the valve body assembly.

[0021] Preferably, the device further comprises a plug, the plug having a laser welding surface, the plug being fixed and sealed to the valve body assembly by laser welding.

[0022] The plastic EGR valve device of the utility model can improve corrosion resistance and prolong service life. The valve body is made of glass fiber reinforced polyphenylene sulfide resin or glass fiber reinforced polyphthalamide resin material, which can maintain product size stability and good mechanical properties under high temperature, high humidity and acidic environment, guarantee the reliability of EGR valve during the service life, solve the jam failure and abnormal engine operation caused by EGR valve corrosion, and improve the reliability of EGR system. The device can reduce manufacturing cost. The valve body is manufactured by using precision injection molding technology, the gear pin, shaft sleeve and corresponding nut insert are injected into the plastic valve body, there is no subsequent machining process, the subsequent assembly process is reduced, the production efficiency is high, the production cost is low, and the product performance price ratio is improved. The device can reduce weight. By using plastic material, the overall weight of the EGR valve can be reduced by 30%-50%, so as to realize the lightweight design of the whole vehicle. Reducing weight not only improves fuel economy, but also prolongs the battery endurance mileage of new energy vehicle models, meets the industry energy saving and emission reduction trend. The plastic EGR valve successfully solves the shortcomings of high cost, heavy weight, insufficient corrosion resistance and low production efficiency of the existing aluminum alloy EGR valve by optimizing material selection and structure design, and has obvious technical and economic advantages. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an axial appearance view of the plastic EGR valve device of the utility model.

[0024] Figure 2 It is a sectional view A-A of the plastic EGR valve device of the utility model.

[0025] Figure 3 It is a sectional view B-B of the plastic EGR valve device of the utility model.

[0026] Figure 4 It is a sectional view C-C of the plastic EGR valve device of the utility model.

[0027] Figure 5This is a cross-sectional view of the plastic EGR valve device of this utility model.

[0028] Figure 6a This is a front structural diagram of the gears and cams of the plastic EGR valve device of this utility model.

[0029] Figure 6b This is a schematic diagram of the reverse structure of the gears and cams in the plastic EGR valve device of this utility model.

[0030] Figure 7 This is a schematic diagram of the plastic cover plate structure of the plastic EGR valve device of this utility model.

[0031] Figure 8 This is a schematic diagram of the limiting mechanism of the plastic EGR valve device of this utility model.

[0032] Figure label:

[0033] 1. Plastic cover

[0034] 2 Displacement Sensor

[0035] 3 magnets

[0036] 4 Valve body assembly

[0037] 5 guide sleeves

[0038] 6. Push rod shaft

[0039] 7 Valve Bowl

[0040] 8. Cover

[0041] 9 O-rings

[0042] 10 Plastic bushings

[0043] 11-Pole Support

[0044] 12 metal shaft

[0045] 13 transmission gears

[0046] 14 Deep Groove Ball Bearing

[0047] 15 Sealing rings

[0048] 16 Return Springs

[0049] 17 Pressure relief hole

[0050] 18 breathable membrane

[0051] 19 Waveform Spring

[0052] 20 motors

[0053] 4.1 Stainless steel ring

[0054] 4.2 valve seat

[0055] 4.3 sliding bushing

[0056] 4.4 transmission gear shaft

[0057] 11.1 metal bushing

[0058] 11.2 conical cylinder structure

[0059] 13.1 inner cam

[0060] 13.2 outer cam

[0061] 20.1 motor flange

[0062] 20.2 motor gear DETAILED DESCRIPTION

[0063] In order to more clearly describe the technical content of the utility model, further description will be made in combination with specific embodiments.

[0064] The plastic EGR valve device of the utility model, wherein including plastic cover plate 1, valve body assembly 4, ejector rod shaft 6, valve bowl 7, two O type rings 9, plastic bushing 10, ejector rod support 11, metal shaft 12, transmission gear 13, deep groove ball bearing 14 and motor 20, valve body assembly 4 is an insert injection molding part, plastic cover plate 1 is installed on valve body assembly 4, one end of ejector rod shaft 6 is fixedly connected with the metal insert of ejector rod support 11, and passes through the sliding bushing 4.3 of valve body assembly 4, two O type rings 9 and plastic bushing 10, the other end of ejector rod shaft 6 is fixedly connected with valve bowl 7, plastic bushing 10 is installed between two O type rings 9 and forms a cavity between two O type rings 9, ejector rod support 11 is fixedly connected with ejector rod shaft 6, metal shaft 12 is press-fitted on ejector rod support 11, deep groove ball bearing 14 is press-fitted on metal shaft 12, plastic cover plate 1 is connected with motor 20 through motor pin, and transmission gear 13 is engaged with motor 20.

[0065] As a preferred embodiment of the utility model, the device further includes metal bushing 11.1 and conical cylinder structure 11.2, metal bushing 11.1 is embedded in the inside of ejector rod support 11, metal bushing 11.1 is fixedly connected with ejector rod shaft 6, and both sides of ejector rod support 11 are respectively provided with conical cylinder structure 11.2.

[0066] As the preferred embodiment of the utility model, the device further includes two return springs 16, the two return springs 16 are respectively installed on the conical cylinder structure 11.2 of the two sides of the top rod support 11, the return spring 16 is in compression state, the return spring 16 cooperates with the conical cylinder structure 11.2, fixes the position of the return spring 16 on the top rod support 11, and the other side of the return spring 16 contacts the spring cavity wall of the valve body assembly 4.

[0067] As the preferred embodiment of the utility model, the device further includes motor flange 20.1 and motor gear 20.2, the motor flange 20.1 is fixedly connected with the motor 20 and is installed on the valve body assembly 4 through screw, the outer ring of the motor flange cooperates with the motor flange hole on the valve body assembly 4, and the motor gear 20.2 is fixed on the motor shaft and is engaged with the transmission gear 13.

[0068] As the preferred embodiment of the utility model, the device further includes outer cam 13.2 and inner cam 13.1, the outer cam 13.2 and the inner cam 13.1 are arranged on the transmission gear 13, the deep groove ball bearing 14 contacts the outer cam 13.2 and the inner cam 13.1, the outer cam 13.2 always contacts the deep groove ball bearing 14 under the action of the return spring 16, the outer cam 13.2 and the inner cam 13.1 move by pushing and pulling the deep groove ball bearing 14, and drive the top rod shaft 6 to open and close the valve bowl 7.

[0069] As the preferred embodiment of the utility model, the device further includes stainless steel ring 4.1 and sliding bushing 4.3, the valve body assembly 4 is wrapped with the stainless steel ring 4.1, the sliding bushing 4.3 is sleeved on the valve body assembly 4, the valve body assembly 4 includes valve seat 4.2, the inclined surface of the valve seat 4.2 contacts the valve bowl 7, the valve body assembly 4 includes transmission gear pin 4.4, and the transmission gear 13 is installed on the transmission gear pin shaft 4.4 to rotate and transmit motion.

[0070] As the preferred embodiment of the utility model, the device further includes displacement sensor 2 and magnet 3, the displacement sensor 2 is installed on the plastic cover plate 1, the magnet 3 is installed on the top rod support 11, and the displacement sensor 2 and the magnet 3 form an EGR valve displacement detection unit.

[0071] As the preferred embodiment of the utility model, the device further includes pressure relief hole 17 and air permeable membrane 18, the air permeable membrane 18 is fixedly connected to the hole of the pressure relief hole 17, and the pressure relief hole 17 is connected with the cavity of the plastic bushing 10.

[0072] As the preferred embodiment of the utility model, the device further includes wave-shaped elastic sheet 19, and the wave-shaped elastic sheet 19 is installed at the bottom of the motor 20.

[0073] As the preferred embodiment of the utility model, the device further comprises a guide sleeve 5, and the guide sleeve 5 is installed on the valve body assembly 4.

[0074] As the preferred embodiment of the utility model, the device further comprises a plug cover 8, and the plug cover 8 is provided with a laser welding surface, is fixedly connected with the valve body assembly 4 through laser welding and seals the air channel.

[0075] In the specific embodiment of the utility model, an EGR valve mainly comprises the following structures.

[0076] 1, plastic cover plate 1. As the EGR valve gear cavity sealing cover, it is also the EGR valve electrical transmission interface, and is provided with a displacement sensor 2, and the sensor and motor plug-in PIN needle are embedded and injection molded, responsible for receiving the motor drive voltage and sensor supply voltage output by the customer ECU, and feeding back the EGR valve position signal to the customer ECU.

[0077] 2, displacement sensor 2. It is installed on the plastic cover plate 1, and the magnet 3 installed on the ejector rod support 11 constitutes an EGR valve displacement detection unit, which can detect the position of the EGR valve in real time and feed back the position signal to the customer ECU.

[0078] 3, magnet 3. After magnetization, a magnetic field is generated, and the position change of the magnet 3 causes the sensor 2 to induce electromotive force change, thereby detecting the position of the valve.

[0079] 4, valve body assembly 4. The valve body assembly 4 is the main structural part of the EGR valve, and other primary sub-components are installed on the valve body assembly 4. The valve body assembly 4 is an embedded injection molded part, and a stainless steel ring 4.1 is wrapped thereon. The valve seat 4.2 solves the problem of corrosion and adhesion with the valve bowl 7. The contact part between the valve seat 4.2 and the valve bowl 7 is beveled, closely matched with the valve bowl 7, and reduces the contact creep deformation. The sliding bushing 4.3, the transmission gear pin 4.4, and a plurality of nuts and bolt bushings are provided with laser welding fusion grooves at the plug position.

[0080] 5, guide sleeve 5. The guide sleeve 5 is made of stainless steel, which can guide the ejector rod shaft 6 and prevent oil and particles from entering the sealing area.

[0081] 6, ejector rod shaft 6. The ejector rod is made of high-grade stainless steel, which effectively solves the problem of waste gas corrosion. The ejector rod shaft 6 is a moving part, one end of which is fixedly connected with the metal insert of the ejector rod support 11, passes through the sliding bushing 4.3 of the valve body assembly 4, the O-shaped ring 9 and the plastic bushing 10, and the other end is fixedly connected with the valve bowl 7. After the ejector rod support 11 is subjected to an axial thrust, the ejector rod shaft 6 and the valve bowl 7 will move together, the EGR valve air passage is opened, and the larger the opening degree is, the larger the air passage flow is.

[0082] 7. Valve bowl 7. Valve bowl 7 is made of high-grade stainless steel to solve the corrosion problem. Valve bowl 7 is the opening and closing part of the valve gas path, and cooperates with the valve seat 4.2 on the valve body assembly 4 to control the gas path. When the valve bowl 7 is seated on the valve seat 4.2, the gas path is cut off.

[0083] 8. Plug cover 8. The plug cover 8 is a plastic part with a laser welding surface designed on it. It is fixed and sealed with the valve body assembly 4 through laser welding to solve the risk of waste gas leakage caused by the traditional press-fitting structure.

[0084] 9. O-ring 9. Double O-ring 9 design effectively prevents waste gas from entering the sealed shaft sleeve and causing corrosion and jamming of the sealed shaft sleeve.

[0085] 10. Plastic bushing 10. It is used to isolate the two O-rings 9 and form a cavity between the two O-rings 9, providing a pressure relief space for the waste gas that breaks through the first O-ring 9. The waste gas is discharged into the atmosphere through the pressure relief hole 17 and the air permeable membrane 18, ensuring that no waste gas enters the sliding bushing 4.3 area.

[0086] 11. Ejector rod support 11. The ejector rod support 11 serves as a structure for connection and transmission of motion, with a magnet 3 installed on it and a metal bushing 11.1 embedded inside. The metal bushing 11.1 is fixed to the ejector rod shaft 6, and the ejector rod support 11 is provided with two cone structures on both sides for installing compression springs 16. On the gear side, the ejector rod support 11 is provided with a metal shaft hole.

[0087] 12. Metal shaft 12. The metal shaft 12 is press-fitted on the ejector rod support 11, and a deep groove ball bearing 14 is further press-fitted on the metal shaft 12.

[0088] 13. Transmission gear 13. The transmission gear 13 engages with the motor gear 20.2 and is installed on the transmission gear pin 4.4 to amplify the motor torque and drive the ejector rod shaft 6 to move. The transmission gear 13 is provided with an outer cam 13.2 and an inner cam 13.1. The outer cam 13.2 is always in contact with the deep groove ball bearing 14 under the pre-tightening force of the return spring 16. The outer cam 13.2 moves the deep groove ball bearing 14 by pushing it to drive the ejector rod shaft 6 to open the valve bowl 7. When returning, the valve bowl 7 will return under the force of the return spring 16. When there is resistance to return, the inner cam 13.1 contacts the bearing 14 to forcibly return under the drive of the motor 20, ensuring that the valve bowl 7 can reliably seat on the valve seat 4.2 to seal the gas path under any circumstances, ensuring normal operation of the engine.

[0089] 14. Deep groove ball bearing 14. The deep groove ball bearing 14 is interference press-fitted on the metal shaft 12 of the ejector rod support 11 and contacts the outer cam 13.2 and the inner cam 13.1 to transmit the cam thrust to the subsequent ejector rod shaft 6 component, reducing the cam driving friction and improving the cam life.

[0090] 15. Sealing ring 15. Sealing ring 15 is a sealing part matched with customer interface, sealing customer interface to prevent exhaust gas leakage.

[0091] 16. Return spring 16. Two return springs 16 are used in EGR valve, return spring 16 is installed in compressed state by default, return spring 16 is fixed on the top rod bracket 11 by cooperating with two conical cylinder structures 11.2 on the side of the top rod bracket 11, and the other side of the return spring 16 is in contact with the spring cavity wall of the valve body assembly 4, the double spring design can effectively prevent the top rod bracket 11 from deflecting during operation.

[0092] 17. Pressure relief hole 17. The pressure relief hole 17 is used to release the pressure generated by the small amount of exhaust gas permeating through the first O-ring 9 through the gas permeable membrane 18 fixed on the hole, completely solving the possibility of exhaust gas entering the second O-ring 9.

[0093] 18. Gas permeable membrane 18. The gas permeable membrane 18 allows gas to flow from high pressure area to low pressure area when there is pressure difference, and plays a role in balancing the pressure difference inside and outside the cavity. The use of the gas permeable membrane 18 can solve the possibility of exhaust gas entering the sliding bushing, and effectively prevent external water or waste liquid from entering the movement area of the top rod shaft 6.

[0094] 19. Wave spring 19. The wave spring 19 provides axial pre-tightening force for the motor 20, ensures the reliable position of the motor 20, and ensures the stability and consistency of the center distance between the motor gear 20.2 and the transmission gear 13.

[0095] 20. Motor 20. The motor 20 is the power source of the EGR valve, the customer ECU driving signal is transmitted to the motor 20 through the motor pin of the plastic cover plate 1, and the motor 20 is controlled to open, close or adjust the opening size according to the positive and negative rotation instruction. The motor flange 20.1 is fixed with the motor 20, which plays a role in positioning the direction and position of the motor 20, and is installed on the valve body assembly 4 through screws. The outer diameter of the motor flange is matched with the motor flange hole on the valve body assembly 4 with a small gap, to determine the center distance between the motor 20 and the transmission gear 13 after installation. The motor gear 20.2 is fixed on the motor shaft and rotates with the motor shaft, and is engaged with the transmission gear 13 to amplify the motor torque for driving the top rod shaft 6 to move.

[0096] The engine ECU calculates the EGR rate required for engine operation according to the depth of the accelerator pedal / throttle opening. The relationship between the EGR rate and the opening of the valve has been set through calibration, and the ECU can obtain the corresponding position signal of the EGR valve by looking up the table according to the EGR rate.

[0097] ECU drives EGR valve motor 20 to work, drives the ejector rod to move to the target position, the position sensor on the EGR plastic cover can detect the valve opening position in real time, and feed back the valve position to the ECU in real time, after the valve moves to the target position, the ECU will control the valve to be stable at this position, and wait for the next position control instruction.

[0098] The ejector rod shaft 6 is made of conventional stainless steel, and the surface of the ejector rod shaft 6 is sprayed with Teflon, and the corrosion problem of the ejector rod shaft 6 can also be solved.

[0099] The valve bowl 7 is made of stainless steel, and the surface of the valve bowl 7 is sprayed with Teflon, or the position of the contact surface with the valve seat is packed with plastic, and the corrosion and jamming problem of the valve bowl 7 can also be solved.

[0100] The insert valve seat can be cancelled, and the valve body is directly injection molded with the same high-performance plastic material, so as to solve the corrosion problem of the valve seat or embed the metal valve seat, so that the position in contact with the valve bowl 7 is plastic, and the corrosion and jamming problem of the valve bowl 7 can also be solved.

[0101] The double cam structure of the gear drives the connecting rod with the outer cam, and the inner cam provides the failure return function. The exhaust hole and the air permeable film 18 form pressure balance. The insert design of the plastic valve body assembly 4, the high-grade stainless steel ejector rod shaft 6, the high-grade stainless steel valve bowl 7, the high-grade stainless steel valve seat and the like prevent corrosion and jamming design. The plastic valve body material is designed by using glass fiber reinforced polyphenylene sulfide resin or glass fiber reinforced polyphthalamide resin material.

[0102] The specific implementation scheme of the embodiment can refer to the related description in the above-mentioned embodiments, which will not be repeated here.

[0103] It can be understood that the same or similar parts in the above-mentioned embodiments can be mutually referred to, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0104] It should be noted that, in the description of the present application, the terms "first", "second" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, "a plurality of" means at least two.

[0105] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the present application, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] The plastic EGR valve device can improve corrosion resistance, prolong service life, and reduce manufacturing cost. The valve body is made of precise injection molding technology, the gear pin, shaft sleeve and corresponding nut insert are injected into the plastic valve body, there is no subsequent machining process, the subsequent assembly process is reduced, the production efficiency is high, the production cost is low, the product performance price ratio is improved. The device can reduce weight. By using plastic material, the overall weight of the EGR valve can be reduced by 30%-50%, thereby realizing the lightweight design of the whole vehicle. Reducing weight not only improves fuel economy, but also prolongs the battery mileage of new energy vehicle models, meets the industry energy-saving and emission-reduction trend. The plastic EGR valve successfully solves the shortcomings of the existing aluminum alloy EGR valve, such as high cost, heavy weight, insufficient corrosion resistance, low production efficiency and the like, and has significant technical and economic advantages.

[0107] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A plastic EGR valve device, characterized by, The device comprises a plastic cover plate, a valve body assembly, a ejector rod shaft, a valve bowl, two O-rings, a plastic bushing, a ejector rod support, a metal shaft, a transmission gear, a deep groove ball bearing and a motor, the valve body assembly is an insert injection molding part, the plastic cover plate is installed on the valve body assembly, one end of the ejector rod shaft is fixedly connected with the metal insert of the ejector rod support and passes through the sliding bushing, the two O-rings and the plastic bushing of the valve body assembly, the other end of the ejector rod shaft is fixedly connected with the valve bowl, the plastic bushing is installed between the two O-rings and forms a cavity between the two O-rings, the ejector rod support is fixedly connected with the ejector rod shaft, the metal shaft is press-fitted on the ejector rod support, the deep groove ball bearing is press-fitted on the metal shaft, the plastic cover plate is connected with the motor through motor pins, and the transmission gear is engaged with the motor.

2. The plastic EGR valve device of claim 1, wherein, The device further comprises a metal bushing and a conical cylinder structure, the metal bushing is embedded in the ejector rod support, the metal bushing is fixedly connected with the ejector rod shaft, and the two sides of the ejector rod support are respectively provided with the conical cylinder structure.

3. The plastic EGR valve device of claim 2, wherein, The device further comprises two return springs, the two return springs are respectively installed on the conical cylinder structures on the two sides of the ejector rod support, the return springs are in a compressed state, the return springs cooperate with the conical cylinder structures to fix the positions of the return springs on the ejector rod support, and the other sides of the return springs are in contact with the spring cavity walls of the valve body assembly.

4. The plastic EGR valve apparatus of claim 1, wherein, The device further comprises a motor flange and a motor gear, the motor flange is fixedly connected with the motor and is installed on the valve body assembly through screws, the outer ring of the motor flange is matched with the motor flange hole on the valve body assembly, and the motor gear is fixedly connected with the motor shaft and engaged with the transmission gear.

5. The plastic EGR valve device of claim 1, wherein, The device further comprises an outer cam and an inner cam, the outer cam and the inner cam are arranged on the transmission gear, the deep groove ball bearing is in contact with the outer cam and the inner cam, the outer cam is always in contact with the deep groove ball bearing under the action of the return spring, the outer cam and the inner cam move the deep groove ball bearing by pushing and drive the ejector rod shaft to open and close the valve bowl.

6. The plastic EGR valve apparatus of claim 1, wherein, The device further comprises a stainless steel ring and a sliding bushing, the valve body assembly is wrapped with the stainless steel ring, the sliding bushing is sleeved on the valve body assembly, the valve body assembly comprises a valve seat, and the inclined surface of the valve seat is in contact with the valve bowl.

7. The plastic EGR valve apparatus of claim 1, wherein The device further comprises a displacement sensor and a magnet, the displacement sensor is installed on the plastic cover plate, and the magnet is installed on the ejector rod support.

8. The plastic EGR valve device of claim 1, wherein, The device further comprises a pressure relief hole and a breathable film, the breathable film is fixedly connected with the hole of the pressure relief hole, and the pressure relief hole is communicated with the cavity of the plastic bushing.

9. The plastic EGR valve device of claim 1, wherein, The device further comprises a wave-shaped elastic sheet, and the wave-shaped elastic sheet is installed at the bottom of the motor.

10. The plastic EGR valve device of claim 1, wherein, The device further comprises a guide sleeve, and the guide sleeve is installed on the valve body assembly.

11. The plastic EGR valve device of claim 1, wherein, The device further comprises a plug, the plug is provided with a laser welding surface, and the plug is fixedly connected with the valve body assembly and seals the air channel through laser welding.

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