EGR valve, engine, power assembly and vehicle

Abstract

The EGR valve comprises a valve body, a valve rod and a shaft sleeve, a shaft hole and a waste gas channel are formed in the valve body, the shaft hole is communicated with the waste gas channel, the valve rod is arranged in the shaft hole and the waste gas channel in a penetrating mode, and the valve rod can rotate in the shaft hole to achieve opening, closing and adjustment of the waste gas channel. The shaft sleeve surrounds the valve rod, is arranged at the end, close to the waste gas channel, of the shaft hole and isolates the valve rod from the inner wall of the shaft hole. Therefore, waste gas can be effectively prevented from making contact with the inner wall of the shaft hole, the inner wall of the shaft hole is prevented from being corroded by the waste gas, the valve rod can smoothly rotate in the shaft hole, the clamping stagnation phenomenon of the valve body is avoided, and normal use of the EGR valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of EGR valve design, in particular to an EGR valve, an engine, a power assembly and a vehicle. Background Art

[0002] The harmful nitrogen oxides produced by engine combustion are formed by nitrogen and oxygen in the air under high temperature and oxygen-rich conditions. The higher the combustion temperature and the leaner the mixture, the more nitrogen oxides are discharged. The exhaust gas recirculation system (EGR) is a type of off-engine purification technology. It relies on the EGR valve to introduce exhaust gas into the intake pipe, reduce the oxygen content in the intake air, and thus reduce the combustion temperature, so as to reduce the emission of nitrogen oxides.

[0003] At present, most EGR valves use an aluminum alloy valve body. The valve body is provided with an axial hole for passing the valve stem and an exhaust gas channel for circulating the exhaust gas. During the use of the EGR valve, the exhaust gas can easily penetrate into the end where the axial hole is connected to the exhaust gas channel, causing corrosion of the inner wall of the axial hole, and then causing the valve body to become stuck, affecting the normal use of the EGR valve. Utility Model Content

[0004] In view of this, the utility model provides an EGR valve, an engine, a power assembly and a vehicle, so as to at least solve the problem that the existing EGR valve is prone to getting stuck during operation.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model provides an EGR valve, comprising a valve body, a valve stem and a shaft sleeve;

[0007] The valve body is provided with an axial hole and an exhaust gas channel, the axial hole and the exhaust gas channel are communicated with each other, and the valve stem is penetrated in the axial hole and the exhaust gas channel;

[0008] The shaft sleeve is arranged around the valve stem and at the end of the shaft hole close to the exhaust gas channel, and isolates the valve stem and the inner wall of the shaft hole.

[0009] Optionally, the outer wall of the sleeve fits with the inner wall of the shaft hole.

[0010] Optionally, there are two axial holes, which are coaxially arranged and both are interconnected with the exhaust gas channel;

[0011] The end of each of the shaft holes close to the exhaust passage is provided with the shaft sleeve.

[0012] Optionally, the EGR valve further comprises a sleeve;

[0013] The sleeve is arranged in the exhaust gas passage, and the outer wall of the sleeve is in contact with the inner wall of the exhaust gas passage;

[0014] The sleeve is provided with a through hole, the through hole is coaxially arranged with the axial hole, and the valve stem is also inserted into the through hole.

[0015] Optionally, the end surface of the sleeve close to the exhaust gas channel is also in contact with the outer wall of the sleeve.

[0016] Optionally, a groove is provided on the outer wall of the sleeve, the through hole is provided in the groove, and the end surface of the sleeve close to the exhaust gas channel is fitted with the bottom of the groove.

[0017] Optionally, the groove is a cylindrical groove, and the outer wall of the sleeve is also in contact with the inner wall of the groove.

[0018] Optionally, the EGR valve further comprises a bearing;

[0019] The bearing is arranged in the shaft hole to support the valve stem; the bearing is in contact with the end surface of the shaft sleeve away from the exhaust gas channel.

[0020] Optionally, the inner wall of the shaft hole is provided with a slot, and the shaft sleeve is clamped in the slot.

[0021] Optionally, the shaft sleeve is made of stainless steel.

[0022] The utility model also provides an engine, comprising the EGR valve described in any one of the above items.

[0023] The utility model also provides a power assembly, comprising the aforementioned engine.

[0024] The utility model also provides a vehicle, comprising the aforementioned engine or power assembly.

[0025] Compared with the prior art, the EGR valve, engine, powertrain and vehicle described in the utility model have the following advantages:

[0026] The EGR valve of the utility model includes a valve body, a valve stem and a shaft sleeve. The valve body is provided with a shaft hole and an exhaust gas passage. The shaft hole and the exhaust gas passage are interconnected. The valve stem is inserted into the shaft hole and the exhaust gas passage. The valve stem can rotate in the shaft hole to realize the opening, closing and adjustment of the exhaust gas passage. The shaft sleeve is provided at the end of the shaft hole close to the exhaust gas passage. The outer wall of the shaft sleeve fits with the inner wall of the shaft hole, which can effectively prevent the exhaust gas from contacting with the inner wall of the shaft hole, and avoid the exhaust gas from corroding the inner wall of the shaft hole, so that the valve stem can smoothly rotate in the shaft hole, solve the valve body jam phenomenon, and ensure the normal use of the EGR valve.

[0027] The engine, powertrain and vehicle of the present invention have the same or similar advantages as the prior art and the aforementioned EGR valve, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0029] Figure 1 is a schematic diagram of the appearance of an EGR valve in this embodiment;

[0030] Figure 2 is a cross-sectional schematic diagram of an EGR valve in this embodiment;

[0031] Figure 3 is a partial enlarged view of a shaft sleeve portion in this embodiment;

[0032] Figure 4 Schematic diagram of a sleeve in this embodiment.

[0033] Description of reference numerals:

[0034] 1-valve body, 11-shaft hole, 12-exhaust channel, 2-valve stem, 3-shaft sleeve, 4-sleeve, 41-through hole, 42-groove, 43-limiting part, 5-bearing. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0037] It should be understood that the reference to "one embodiment" throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, the "in one embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0038] An EGR valve, an engine, a powertrain and a vehicle provided by the utility model are described in detail below by listing specific embodiments.

[0039] Reference Figures 1 to 3 The utility model provides an EGR valve including a valve body 1, a valve stem 2 and a sleeve 3; an axial hole 11 and an exhaust gas passage 12 are arranged in the valve body 1, the axial hole 11 and the exhaust gas passage 12 are communicated with each other, and the valve stem 2 is inserted into the axial hole 11 and the exhaust gas passage 12; the sleeve 3 is arranged around the valve stem 2 and is arranged at the end of the axial hole 11 close to the exhaust gas passage 12, and isolates the valve stem 2 and the inner wall of the axial hole 3.

[0040] Specifically, the EGR valve is a simple regulating valve that can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media, and mainly plays a role of cutting off and throttling on the pipeline. The EGR valve of this embodiment is applied to the exhaust gas recirculation system of the vehicle, and can introduce the exhaust gas generated during the driving of the vehicle into the intake pipe, reduce the oxygen content in the intake air, thereby reducing the combustion temperature, reducing the emission of nitrogen oxides, and helping to improve the environmental protection of the vehicle and strengthen environmental protection.

[0041] like Figure 1 and Figure 2As shown, the EGR valve of this embodiment includes a valve body 1, a valve stem 2 and a valve flap, etc., the valve body 1 is provided with an axial hole 11 and an exhaust gas channel 12, the exhaust gas channel 12 is used to circulate the exhaust gas generated during the driving process of the vehicle, the axial hole 11 and the exhaust gas channel 12 are connected to each other, the valve stem 2 is penetrated in the axial hole 11 and the exhaust gas channel 12, the diameter of the axial hole 11 is larger than the diameter of the valve stem 2, the exhaust gas channel 12 can be a cylindrical structure, and its diameter is much larger than the diameter of the axial hole 11, one end of the valve stem 2 is penetrated in the axial hole 11, and the other end is penetrated in the exhaust gas channel 12, and its end is in contact with the cavity wall of the exhaust gas channel 12. The end of the valve stem 2 penetrated in the axial hole 11 is connected to a driving mechanism, the driving mechanism includes but is not limited to a motor, etc., and the driving mechanism can drive the valve stem 2 to rotate around its own axis in the axial hole 11. The valve flap is connected to the part of the valve stem 2 located in the exhaust gas channel 12, and the valve flap and the valve stem 2 can be fixedly connected together by welding, assembly connection, etc. The valve body 1 is usually cast as an integral structure, and the valve disc is usually composed of two semi-disc-shaped butterfly plates. The valve stem 2 has a groove along its axial direction to assemble the valve disc. When assembling, the valve stem 2 is first inserted into the shaft hole 11, and then the valve disc is inserted into the groove on the valve stem 2. The valve stem 2 and the valve disc are fixed by bolt connection or welding. The valve disc rotates synchronously with the valve stem 2. The valve disc can be rotated to a position that fits the cavity wall of the exhaust gas channel 12. In this position, the exhaust gas channel 12 is in a blocked state, preventing the flow of exhaust gas. The valve disc can also be rotated to a position separated from the cavity wall of the exhaust gas channel 12. In this position, the exhaust gas channel 12 is in an open state, which can realize the flow of exhaust gas. According to the rotation angle of the valve disc, the flow rate of exhaust gas flowing in the exhaust gas channel 12 can be adjusted, thereby realizing the opening and closing of the exhaust gas channel 12 and the regulation of the exhaust gas.

[0042] The exhaust gas generated during vehicle driving is often a mixture of carbon dioxide, nitrogen oxides, sulfides, etc., which is corrosive to a certain extent. During the operation of the EGR valve, the exhaust gas in the exhaust passage 12 easily penetrates into the shaft hole 11, causing corrosion of the inner wall of the shaft hole 11. The corrosion of the inner wall of the shaft hole 11 will affect the valve stem 2 passing through it, making it impossible for the valve stem 2 to rotate around its own axis in the shaft hole 11, thereby causing the valve body 1 to become stuck, affecting the normal use of the EGR valve. Based on this, if Figure 2 and Figure 3As shown, the EGR valve of this embodiment also includes a sleeve 3, which is arranged around the valve stem 2 and is arranged at the end of the shaft hole 11 close to the exhaust gas channel 12, and isolates the valve stem 2 and the inner wall of the shaft hole 11. It can be understood that the outer wall of the sleeve 3 can abut against the end surface of the exhaust gas channel 12 connected to the shaft hole 11 to ensure the blocking effect of the sleeve 3 on the inner wall of the valve stem 2 and the shaft hole 11. It should be noted that since the valve stem 2 needs to rotate, the sleeve 3 cannot abut on the outer wall of the valve stem 2, that is, there needs to be a certain gap between the sleeve 3 and the valve stem 2, so the exhaust gas can easily penetrate from the exhaust gas channel 12 into the gap between the sleeve 3 and the valve stem 2. When the exhaust gas in the exhaust passage 12 enters the shaft hole 11, the sleeve 3 can effectively prevent the exhaust gas from contacting the inner wall of the shaft hole 11, thereby preventing the exhaust gas from corroding the inner wall of the shaft hole 11, and further allowing the valve stem 2 to smoothly rotate around its own axis in the shaft hole 11, thereby solving the stuck phenomenon of the valve body 1 and ensuring the normal use of the EGR valve. In addition, the axial dimension of the sleeve 3 can be determined according to the axial dimension of the shaft hole 11. The longer the axial dimension of the shaft hole 11, the longer the axial dimension of the sleeve 3 is set accordingly, so as to ensure the exhaust gas barrier effect of the sleeve 3. The sleeve 3 of this embodiment is made of any one or more corrosion-resistant materials such as Teflon, carbon fiber, copper oxide, platinum, stainless steel, etc., and the specific type is not limited in this embodiment.

[0043] In summary, the EGR valve of the utility model includes a valve body 1, a valve stem 2 and a shaft sleeve 3. The valve body 1 is provided with an axial hole 11 and an exhaust gas passage 12. The axial hole 11 and the exhaust gas passage 12 are interconnected. The valve stem 2 is inserted into the axial hole 11 and the exhaust gas passage 12. The valve stem 2 can rotate in the axial hole 11 to realize the opening, closing and adjustment of the exhaust gas passage 12. The shaft sleeve 3 is arranged around the valve stem 2 and is arranged at the end of the axial hole 11 close to the exhaust gas passage 12, and isolates the valve stem 2 from the inner wall of the axial hole 11, so that the exhaust gas in the exhaust gas passage 12 can be effectively blocked from contacting the inner wall of the axial hole 11, and the inner wall of the axial hole 11 can be avoided from being corroded, so that the valve stem 2 can smoothly rotate in the axial hole 11, thereby solving the stuck phenomenon of the valve body 1 and ensuring the normal use of the EGR valve.

[0044] Optionally, refer to Figure 3 The outer wall of the shaft sleeve 3 is in contact with the inner wall of the shaft hole 11 .

[0045] Specifically, if Figure 3 As shown, in some embodiments, the outer wall of the sleeve 3 can be tightly fitted with the inner wall of the shaft hole 11, so that the isolation and sealing effect between the sleeve 3 and the shaft hole 11 is better, which is more conducive to improving the barrier effect of the sleeve 3 on exhaust gas and ensuring that the valve stem 1 rotates smoothly in the shaft hole 11.

[0046] Optionally, refer to Figure 2There are two axial holes 11 , which are coaxially arranged and are both connected to the exhaust gas channel 12 ; the shaft sleeve 3 is arranged at the end of each axial hole 11 close to the exhaust gas channel 12 .

[0047] Specifically, if Figure 2 As shown, the EGR valve is provided with two shaft holes 11, which are coaxially arranged and are both interconnected with the exhaust gas channel 12. The valve stem 2 penetrates the exhaust gas channel 12 and is arranged in the two shaft holes 11. In the case of two shaft holes 11, the EGR valve can use a butterfly valve, and the valve stem 2 can rotate around its own axis in the two shaft holes 11, thereby driving the valve disc to rotate synchronously, so that the valve disc rotates to a position where it fits or separates from the cavity wall of the exhaust gas channel 12, thereby closing or opening the exhaust gas channel 12. The two shaft holes 11 make the axial positioning of the valve stem 2 more precise, so that the rotation stability of the valve stem 2 is better and the reliability is higher. When there are two axial holes 11, exhaust gas can enter the axial hole 11 from the position where the two axial holes 11 are connected to the exhaust gas channel 12. Therefore, in this embodiment, a shaft sleeve 3 is provided at the end of each axial hole 11 close to the exhaust gas channel 12 to block the exhaust gas from contacting the inner wall of the axial hole 11 and avoid corrosion of the inner wall of the axial hole 11 by the exhaust gas, so that the valve stem 2 can rotate smoothly in the axial hole 11, thereby solving the problem of valve body 1 getting stuck and ensuring the normal use of the EGR valve.

[0048] Optionally, refer to Figures 2 to 4 The EGR valve also includes a sleeve 4; the sleeve 4 is arranged in the exhaust gas channel 12, and the outer wall of the sleeve 4 is in contact with the inner wall of the exhaust gas channel 12; a through hole 41 is opened on the sleeve 4, and the through hole 41 is coaxially arranged with the axial hole 11, and the valve stem 2 is also penetrated into the through hole 41.

[0049] Specifically, the EGR valve further includes a sleeve 4, and the shape and structure of the sleeve 4 are the same as the shape and structure of the exhaust gas passage 12. Figure 4 The schematic diagram of the cylindrical sleeve 4 is shown. The sleeve 4 is arranged in the exhaust gas channel 12. The outer wall of the sleeve 4 fits with the inner wall of the exhaust gas channel 12. The inner wall of the sleeve 4 forms a cylindrical cavity, and the exhaust gas flows through the cylindrical cavity. Figure 4 As shown, one or more limiting parts 43 may be provided on the outer wall of the sleeve 4, and the limiting parts 43 may be a step structure, a protrusion, a slot, etc. When the sleeve 4 is die-casted in the exhaust gas passage 12 of the valve body 1, the limiting parts 43 can limit the sleeve 4 to prevent the sleeve 4 from rotating relative to the valve body 1 and affecting the die-casting effect. The sleeve 4 of this embodiment is also made of any one or more corrosion-resistant materials such as Teflon, carbon fiber, copper oxide, platinum, stainless steel, etc., and is provided in the exhaust gas passage 12, which can prevent the exhaust gas flowing through the exhaust gas passage 12 from directly contacting the inner wall of the valve body 1, thereby protecting the inner wall of the valve body 1 and preventing it from being corroded by the exhaust gas.

[0050] like Figure 4 As shown, a through hole 41 is provided on the sleeve 4, and the through hole 41 is coaxially arranged with the shaft hole 11. The valve stem 2 passes through the shaft hole 11 and the through hole 41 at the same time and is located in the exhaust passage 12. The diameter of the through hole 41 is slightly smaller than the diameter of the shaft hole 11, and slightly larger than the diameter of the valve stem 2, so as to ensure that the valve stem 2 can be smoothly inserted into the through hole 41 and rotate in the through hole 41, and at the same time, the peripheral side of the through hole 41 can play a supporting and limiting role for the sleeve 3. The number of through holes 41 is determined according to the number of shaft holes 11. If there is one shaft hole 11, the number of through holes 41 is also one. The through hole 41 is interconnected with the shaft hole 11, and the valve stem 2 is inserted into the exhaust passage 12 in a non-through manner, that is, one end of the valve stem 2 is inserted into the shaft hole 11, and the other end is in contact with the inner wall of the exhaust passage 12. If there are two shaft holes 11, the number of through holes 41 is also two, each through hole 41 is communicated with one shaft hole 11, and the valve stem 2 is penetrated in the exhaust gas passage 12, that is, both ends of the valve stem 2 are penetrated in the shaft hole 11. In addition, the sleeve 4 of this embodiment can be an integrally processed structure, or a split-type processed structure, in which two parts are assembled and connected together, and this embodiment does not limit this.

[0051] Optionally, refer to Figure 3 The end surface of the shaft sleeve 3 close to the exhaust gas channel 12 is also in contact with the outer wall of the sleeve 4.

[0052] Specifically, when the EGR valve includes the sleeve 4, the end face of the sleeve 3 close to the exhaust passage 12 is also in contact with the outer wall of the sleeve 4, and the outer wall of the sleeve 4 plays an axial limit role on the sleeve 3, which helps to improve the installation stability of the sleeve 3. The outer wall of the sleeve 3 is in contact with the inner wall of the shaft hole 11, and the end face of the sleeve 3 is in contact with the outer wall of the sleeve 4, forming a two-sided contact form, which realizes the sealing between the sleeve 3 and the sleeve 4, and can effectively prevent the exhaust gas from entering the shaft hole 11 from the gap between the sleeve 3 and the sleeve 4, thereby further blocking the possibility of the exhaust gas contacting the inner wall of the shaft hole 11, and avoiding the exhaust gas from corroding the inner wall of the shaft hole 11. In the process of assembling the sleeve 3 and the sleeve 4, the sleeve 4 is first die-cast in the exhaust passage 12 of the valve body 1, and then the sleeve 3 is pressed into the shaft hole 11, so that the end face of the sleeve 3 close to the exhaust passage 12 is in contact with the outer wall of the sleeve 4.

[0053] Optionally, refer to Figure 3 and Figure 4 The outer wall of the sleeve 4 is provided with a groove 42 , the through hole 41 is provided in the groove 42 , and the end surface of the sleeve 3 close to the exhaust gas passage 12 is in contact with the bottom of the groove 42 .

[0054] Specifically, if Figure 4As shown, the outer wall of the sleeve 4 is provided with a groove 42, the diameter of the groove 42 is the same as the diameter of the shaft hole 11, and the through hole 41 on the sleeve 4 is arranged in the groove 42. Figure 3 As shown, the end face of the sleeve 3 close to the exhaust passage 12 fits with the bottom of the groove 42, and the groove 42 can play an axial limiting role on the sleeve 3 to prevent the sleeve 3 from axial displacement. In some embodiments, the bottom of the groove 42 is a plane, and correspondingly, the end face of the sleeve 3 is also a plane to ensure that the end face of the sleeve 3 is fully fitted with the bottom of the groove. In some embodiments, the bottom of the groove 42 is an arc surface, and correspondingly, the end face of the sleeve 3 is also an arc surface, and the curvature of the two arc surfaces is the same to ensure that the end face of the sleeve 3 is fully fitted with the bottom of the groove.

[0055] Optionally, refer to Figure 3 and Figure 4 The groove 42 is a cylindrical groove, and the outer wall of the sleeve 3 is also in contact with the inner wall of the groove 42.

[0056] Specifically, if Figure 4 As shown, the groove 42 is a cylindrical groove, and the through hole 41 is arranged at the center position of the cylindrical groove. On the basis that the end face of the sleeve 3 close to the exhaust gas channel 12 is fitted with the groove bottom of the groove 42, the outer wall of the sleeve 3 is also extended along its axial direction to fit with the inner wall of the groove 42, so that the sleeve 3 forms three fitting relationships. The outer wall of the sleeve 3 is respectively fitted with the inner wall of the shaft hole 11 and the inner wall of the groove 42, and the end face of the sleeve 3 is fitted with the outer wall of the sleeve 4, so that the installation of the sleeve 3 in the valve body 1 is more reliable, and the sealing effect between the sleeve 3 and the sleeve 4 is more significant, which can effectively prevent the exhaust gas from entering the shaft hole 11 from the gap between the sleeve 3 and the sleeve 4, thereby blocking the possibility of the exhaust gas contacting the inner wall of the shaft hole 11, and avoiding the exhaust gas from corroding the inner wall of the shaft hole 11.

[0057] Optionally, refer to Figure 2 and Figure 3 The EGR valve further includes a bearing 5 ; the bearing 5 is disposed in the shaft hole 11 for supporting the valve stem 2 ; the bearing 5 is in contact with the end surface of the sleeve 3 away from the exhaust gas passage 12 .

[0058] Specifically, the EGR valve further includes a bearing 5, which is arranged in the shaft hole 11. The bearing 5 is used to support the valve stem 2. The outer ring of the bearing 5 is in contact with the inner wall of the shaft hole 11, and the inner ring of the bearing 5 is connected to the valve stem 2. When the driving mechanism drives the valve stem 2 to rotate in the shaft hole 11 around its own axis, the inner ring of the bearing 5 rotates synchronously with the valve stem 2, and the outer ring of the bearing 5 remains stationary. The arrangement of the bearing 5 can improve the stability and reliability of the rotation of the valve stem 2 in the shaft hole 11, avoid axial or radial sliding of the valve stem 2, and thus help to ensure the normal opening and closing of the exhaust gas channel 12. In some embodiments, the bearing 5 can be a needle roller bearing, which is equipped with thin and long rollers, has a compact radial structure, and is particularly suitable for a support structure with a limited radial installation size. At the same time, the needle roller bearing has a small friction coefficient, high transmission efficiency, low heat generation, and high operating precision, which helps to ensure the service life of the bearing 5 and the valve stem 2.

[0059] The bearing 5 is fitted with the end face of the sleeve 3 away from the exhaust gas passage 12, which can play an axial limiting role on the sleeve 3, and help to improve the installation stability of the sleeve 3. At the same time, the sleeve 3 is located between the sleeve 4 and the bearing 5, which can effectively isolate the inner wall of the shaft hole 11 located between the sleeve 4 and the bearing 5, and prevent the inner wall of the shaft hole 11 from being corroded by the exhaust gas. It should be noted that, since the inner ring of the bearing 5 will rotate synchronously with the valve stem 2, the end face of the sleeve 3 is only fitted with the outer ring of the bearing 5, not the inner ring of the bearing 5, to avoid the inner ring of the bearing 5 rotating with the valve stem 2. The end face of the sleeve 3 is only fitted with the outer ring of the bearing 5, and not with the inner ring of the bearing 5, so as to avoid damage to the end face of the sleeve 3 during the process of the inner ring of the bearing 5 rotating with the valve stem 2. During the process of assembling the sleeve 3, the sleeve 4 and the bearing 5, the sleeve 4 is first die-cast in the exhaust gas passage 12 of the valve body 1, and then the sleeve 3 is pressed into the shaft hole 11 so that the end face of the sleeve 3 close to the exhaust gas passage 12 fits with the outer wall of the sleeve 4, and then the bearing 5 is pressed into the shaft hole 11 so that the bearing 5 fits with the end face of the sleeve 3 away from the exhaust gas passage 12, thereby realizing the installation of various components.

[0060] Based on the above-mentioned outer wall of the sleeve 3 being fitted with the inner wall of the shaft hole 11, and the end face of the sleeve 3 close to the exhaust gas passage 12 being fitted with the outer wall of the sleeve 4, this embodiment adds that the end face of the sleeve 3 away from the exhaust gas passage 12 is fitted with the bearing 5, realizing the two-way limit of the sleeve 3, which can effectively ensure the installation stability of the sleeve 3, and realize the sealing between the sleeve 3 and the bearing 5, which can effectively prevent the exhaust gas from entering the shaft hole 11 from the gap between the sleeve 3 and the bearing 5, and further reduce the possibility of the exhaust gas corroding the inner wall of the shaft hole 11. In addition, if Figure 2 As shown, the number of bearings 5 ​​is determined by the number of shaft holes 11. If there is one shaft hole 11, there is also one bearing 5. If there are two shaft holes 11, there are also two bearings 5. A bearing 5 is arranged in each shaft hole 11, and the bearings 5 ​​in each shaft hole 11 are fitted with the end surface of the sleeve 3 away from the exhaust gas channel 12.

[0061] Optionally, the shaft sleeve 3 is made of stainless steel.

[0062] Specifically, the stainless steel material is an alloy material composed of iron, chromium and other elements, and has strong corrosion resistance, and can resist the erosion of various chemical substances and oxidants such as water, gas, acid, etc., thereby effectively preventing the exhaust gas from corroding the inner wall of the shaft hole 11. At the same time, the stainless steel material also has high strength and wear resistance, can withstand high temperature and high pressure, is not easy to deform or wear, and can ensure the service life of the sleeve 3. The stainless steel material also has high plasticity and can be easily processed into various shapes and sizes, thereby reducing the processing difficulty of the sleeve 3 and saving processing costs.

[0063] The utility model also provides an engine, comprising the EGR valve described in any one of the above items.

[0064] Specifically, the EGR valve is used in the exhaust gas recirculation system of the engine. The exhaust gas recirculation system is a kind of off-engine purification technology, which can introduce exhaust gas into the combustion chamber, reduce the engine combustion peak, and thus reduce the emission of nitrogen oxides. The exhaust gas recirculation system includes components such as the EGR solenoid valve, the EGR valve, the EGR valve opening sensor, and the ECU (Electronic Control Unit). Among them, the ECU controls the EGR solenoid valve through the duty cycle signal, and opens or closes the EGR valve through the EGR solenoid valve. The EGR valve is a valve that controls the exhaust gas to enter the engine intake pipe. The EGR valve in the embodiment of the utility model has a simple structure, small size, light weight, and large flow rate, which can ensure good exhaust gas recirculation efficiency. At the same time, the EGR valve in the embodiment of the utility model has good anti-exhaust gas corrosion performance, can avoid the valve body stuck phenomenon, ensure its normal use, thereby ensuring the reliability of the exhaust gas recirculation system, and then ensure the normal operation of the engine.

[0065] The utility model also provides a power assembly, comprising the aforementioned engine.

[0066] Specifically, the powertrain includes an engine, a gearbox, a drive shaft, a differential, a clutch, a real vehicle controller, etc. The engine adopts the engine of the aforementioned embodiment, which has high working reliability and high efficiency and can provide stable and reliable power output.

[0067] The utility model also provides a vehicle, comprising the aforementioned engine or power assembly.

[0068] Specifically, the vehicle includes the aforementioned engine or powertrain, which has high reliability and can be used normally and stably for a long time, thereby helping to reduce the vehicle's nitrogen oxide emissions, reduce the vehicle's fuel consumption, and save the vehicle's operating costs.

[0069] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An EGR valve, characterized in that: Including valve body, valve stem and shaft sleeve; The valve body is provided with an axial hole and an exhaust gas channel, the axial hole and the exhaust gas channel are communicated with each other, and the valve stem is penetrated in the axial hole and the exhaust gas channel; The shaft sleeve is arranged around the valve stem and at the end of the shaft hole close to the exhaust gas channel, and isolates the valve stem and the inner wall of the shaft hole.

2. The EGR valve according to claim 1, characterized in that: The outer wall of the shaft sleeve is in contact with the inner wall of the shaft hole.

3. The EGR valve according to claim 1, characterized in that: There are two axial holes, which are coaxially arranged and are both communicated with the exhaust gas channel; The end of each of the shaft holes close to the exhaust passage is provided with the shaft sleeve.

4. The EGR valve according to claim 1, characterized in that: Also includes a sleeve; The sleeve is arranged in the exhaust gas passage, and the outer wall of the sleeve is in contact with the inner wall of the exhaust gas passage; The sleeve is provided with a through hole, the through hole is coaxially arranged with the axial hole, and the valve stem is also inserted into the through hole.

5. The EGR valve according to claim 4, characterized in that: The end surface of the shaft sleeve close to the exhaust gas channel is also in contact with the outer wall of the sleeve.

6. The EGR valve according to claim 5, characterized in that: The outer wall of the sleeve is provided with a groove, the through hole is provided in the groove, and the end surface of the sleeve close to the exhaust gas passage is in contact with the bottom of the groove.

7. The EGR valve according to claim 6, characterized in that: The groove is a cylindrical groove, and the outer wall of the sleeve is also in contact with the inner wall of the groove.

8. The EGR valve according to claim 1, characterized in that: Also includes bearings; The bearing is arranged in the shaft hole to support the valve stem; the bearing is in contact with the end surface of the shaft sleeve away from the exhaust gas channel.

9. The EGR valve according to any one of claims 1 to 8, characterized in that: The shaft sleeve is made of stainless steel.

10. An engine, characterized in that: The EGR valve comprises the EGR valve according to any one of claims 1 to 9.

11. A powertrain, characterized in that: Comprising the engine as claimed in claim 10.

12. A vehicle, characterized in that: Comprising the engine according to claim 10 or the powertrain according to claim 11.

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