Exhaust Gas Recirculation Valve

Abstract

The exhaust gas recirculation valve (100) comprises: a first partition (130) provided on the inner wall of a housing (110) opposite to the side of the valve shaft (120) in a manner of surrounding the valve shaft (120) along the circumferential direction of the valve shaft (120), through which the valve shaft (120) is inserted; and a second partition (130) provided on the inner wall of the housing (110) opposite to the side of the valve shaft (120) in a manner of surrounding the valve shaft (120) along the circumferential direction, closer to the actuator than the position where the first partition (130) is provided. A second partition (140) is provided on the inner wall of the valve body (101) at the position of the valve body (101), through which the valve shaft (120) is inserted; and a sealing portion (150) is provided on the side of the valve shaft (120) in a manner of surrounding the valve shaft (120) along the circumferential direction, and abuts against the first partition (130) when the valve shaft (120) moves linearly along the first direction, and abuts against the second partition (140) when the valve shaft (120) moves linearly along the second direction which is opposite to the first direction.

Description

Technical Field

[0001] The present disclosure relates to an exhaust gas recirculation valve. Background Art

[0002] There is a poppet type exhaust gas recirculation valve that circulates exhaust gas discharged from an engine to an intake flow path of the engine. The valve shaft is linearly moved in an axial direction by an actuator to adjust the flow rate of the exhaust gas.

[0003] The exhaust gas discharged from the engine contains powder particles such as coal. Therefore, in order to improve the durability of the exhaust gas recirculation valve, it is necessary to suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator.

[0004] For example, Patent Document 1 discloses a lift-type exhaust gas recirculation valve, which includes a first shaft portion with a small shaft diameter and a second shaft portion with a large shaft diameter. A valve is fixed to the front end of the second shaft portion, and a shaft sealing portion is arranged on the outer periphery of the rotating shaft to seal the gap generated between the shaft and the housing. The shaft sealing portion is composed of a sealing component formed into a ring shape by a PTFE material and a stainless steel leaf spring incorporated into the sealing component. The ribs arranged on the inner periphery of the sealing component receive the reaction force of the leaf spring and are pressed against the outer peripheral surface of the rotating shaft.

[0005] In the exhaust gas recirculation valve disclosed in Patent Document 1 (hereinafter referred to as "the conventional exhaust gas recirculation valve"), since the shaft seal seals the outer periphery of the second shaft portion when the valve is closed, a large sealing force can be ensured. Therefore, the conventional exhaust gas recirculation valve can suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator. In addition, in the conventional exhaust gas recirculation valve, since the outer periphery of the first shaft portion is sealed when the valve is opened, the sliding resistance relative to the movement of the rotating shaft can be reduced.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2019-190397 Summary of the invention

[0009] Technical problem to be solved by the invention

[0010] In the conventional exhaust gas recirculation valve, the shaft seal seals the outer periphery of the second shaft portion when the valve is closed, thereby ensuring a relatively large sealing force. On the other hand, when the second shaft portion slides in the shaft seal, there is a problem in that the sliding resistance relative to the movement of the rotating shaft increases.

[0011] The present disclosure is made to solve the above-mentioned problems, and its object is to provide an exhaust gas recirculation valve that can keep the sliding resistance of the valve shaft constant when the valve shaft moves linearly and can suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator.

[0012] Technical solutions adopted to solve technical problems

[0013] The exhaust gas recirculation valve disclosed in the present invention is a lift-type exhaust gas recirculation valve, comprising: an actuator, the actuator is protrudingly provided with a valve shaft, the valve shaft has a valve core fixed at one end and moves linearly along the axial direction; a housing, the housing forms a flow path for the exhaust gas and allows the valve shaft to pass through; a first partition, the first partition is arranged on the inner wall of the housing opposite to the side surface of the valve shaft in the radial direction of the valve shaft in a manner of surrounding the valve shaft along the circumferential direction of the valve shaft, the first partition protrudes from the inner wall toward the valve shaft, and the closer the portion of the surface on the valve core side is to the valve shaft, the more it is inclined toward the valve core side, and has a first hole for the valve shaft to pass through in a manner of leaving a gap between the valve shaft and the housing. ; a second partition portion, which is arranged on the inner wall of the housing opposite to the side surface of the radial valve shaft in a manner of surrounding the valve shaft along the circumferential direction and is closer to the actuator than the position where the first partition portion is arranged, the second partition portion protruding from the inner wall toward the valve shaft and having a second hole for inserting the valve shaft; and a sealing portion, which is arranged on the side surface of the radial valve shaft in a manner of surrounding the valve shaft along the circumferential direction, the sealing portion protruding from the side surface toward the inner wall of the housing and abutting against the first partition portion when the valve shaft moves linearly along a first direction, and abutting against the second partition portion when the valve shaft moves linearly along a second direction which is opposite to the first direction.

[0014] Effects of the Invention

[0015] According to the present disclosure, the sliding resistance of the valve shaft can be made constant when the valve shaft moves linearly, and the exhaust gas flowing into the exhaust gas recirculation valve can be suppressed from flowing into the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a configuration diagram showing an example of the configuration of a main part of an internal combustion engine system to which the exhaust gas recirculation valve according to the first embodiment is applied.

[0017] Figure 2 (A) is a structural diagram showing an example of the structure of the main part of the exhaust gas recirculation valve according to the first embodiment. Figure 2 (B) and Figure 2 (C) is to Figure 2 This is an enlarged view of the portion of the circle indicated by the dotted line in (A). DETAILED DESCRIPTION

[0018] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0019] Implementation Method 1

[0020] Reference Figure 1 as well as Figure 2, the exhaust gas recirculation valve 100 according to the first embodiment will be described.

[0021] Reference Figure 1 Next, the configuration of the main part of the internal combustion engine system 1 to which the exhaust gas recirculation valve 100 according to the first embodiment is applied will be described.

[0022] Figure 1 1 is a configuration diagram showing an example of the configuration of the main part of the internal combustion engine system 1 to which the exhaust gas recirculation valve 100 according to the first embodiment is applied.

[0023] The internal combustion engine system 1 of the first embodiment includes an internal combustion engine 10 , an intake pipe 20 , an exhaust pipe 30 , a turbine 40 , an exhaust-side circulation pipe 50 , an intake-side circulation pipe 60 , and an exhaust gas recirculation valve 100 .

[0024] The internal combustion engine 10 is a prime mover such as a gasoline engine that burns fuel in a cylinder and uses combustion gas directly as a working fluid to rotate a crankshaft by the heat energy of the combustion gas.

[0025] The intake pipe 20 is a flow passage pipe through which external air sent to the internal combustion engine 10 flows.

[0026] The exhaust pipe 30 is a flow pipe through which exhaust gas exhausted from the internal combustion engine 10 flows.

[0027] The turbocharger 40 is a supercharger that increases the flow rate of external air flowing through the intake pipe 20 by utilizing the torque of a turbine that rotates in response to the exhaust gas flow flowing through the exhaust pipe 30. The turbocharger 40 is not an essential structure.

[0028] The exhaust circulation pipe 50 is a flow pipe for circulating a part of the exhaust gas exhausted from the internal combustion engine 10 to the intake pipe 20 , and is a pipe serving as a flow path of the exhaust gas from the exhaust pipe 30 to the exhaust gas recirculation valve 100 .

[0029] The intake-side circulation pipe 60 is a flow pipe for circulating a part of the exhaust gas exhausted from the internal combustion engine 10 to the intake pipe 20 , and is a pipe serving as a flow path for the exhaust gas from the exhaust gas recirculation valve 100 to the intake pipe 20 .

[0030] The exhaust gas recirculation valve 100 is a poppet type valve that adjusts the amount of exhaust gas that circulates into the intake pipe 20 in the exhaust gas recirculation mechanism. The exhaust gas recirculation mechanism and the exhaust gas recirculation technology are well known, and therefore, description thereof is omitted.

[0031] Reference Figure 2 , the structure of the main part of the exhaust gas recirculation valve 100 according to the first embodiment will be described.

[0032] Figure 2(A) is a structural diagram showing an example of the structure of the main part of the exhaust gas recirculation valve 100 according to the first embodiment.

[0033] Figure 2 (B) and Figure 2 (C) is to Figure 2 This is an enlarged view of the portion of the circle indicated by the dotted line in (A).

[0034] The exhaust gas recirculation valve 100 includes an actuator 101 , a housing 110 , a valve shaft 120 , a valve core 121 , a valve seat 122 , a first partition 130 , a second partition 140 , and a sealing portion 150 .

[0035] in addition, Figure 2 (A) Figure 2 (B) and Figure 2 (C) is a cross-sectional view of the exhaust gas recirculation valve 100 when the exhaust gas recirculation valve 100 is cut along a plane including the axial center of the valve shaft 120 .

[0036] The exhaust gas recirculation valve 100 may include a bearing 160, a sealing portion 170 different from the sealing portion 150, and an electric rod 180. In the first embodiment, the case where the exhaust gas recirculation valve 100 includes the bearing 160, the sealing portion 170, and the electric rod 180 is described.

[0037] In order to distinguish the sealing portion 150 from the sealing portion 170 , the sealing portion 150 is referred to as a first sealing portion 150 , and the sealing portion 170 is referred to as a second sealing portion 170 hereinafter.

[0038] The actuator 101 is provided with a valve shaft 120 protruding therefrom.

[0039] The actuator 101 receives a control signal output by an ECU (Electronic Control Unit) not shown in the figure, and causes the valve shaft 120 to linearly move along the axial direction of the valve shaft 120 (hereinafter simply referred to as the “axial direction”).

[0040] One end of the valve shaft 120 is fixed to the movable part of the actuator 101, and the other end is fixed to the valve core 121. The valve shaft 120 is moved by the movable part of the actuator 101 to move linearly along the axial direction.

[0041] The valve core 121 moves along the axial direction along with the linear motion of the valve shaft 120 .

[0042] The housing 110 is a frame of the exhaust gas recirculation valve 100 and forms a flow path of the exhaust gas. The valve shaft 120 is inserted through the housing 110. That is, the housing 110 has a hole through which the valve shaft 120 is inserted on the actuator 101 side.

[0043] The housing 110 is Figure 2 The exhaust side circulation pipe 50 is connected in the direction of the arrow X shown in FIG. Figure 2 The casing 110 is connected to the intake-side circulation pipe 60 in the direction of the arrow Y. The casing 110 forms a flow path for allowing the exhaust gas that has flowed into the casing 110 from the exhaust-side circulation pipe 50 to flow out to the intake-side circulation pipe 60.

[0044] The valve seat 122 is a member fixed to the housing 110 and abuts against the valve core 121 when the valve is closed. The valve seat 122 abuts against the valve core 121 when the valve is closed to block the flow path formed in the housing 110, and is separated from the valve core 121 when the valve is opened to form a flow path for exhaust gas to pass through the space between the valve core 121 and the valve seat 122.

[0045] In the following description, the direction in which the valve shaft 120 moves linearly when the valve is opened from a closed state is referred to as a "first direction", and the direction in which the valve shaft 120 moves linearly when the valve is closed from an open state is referred to as a "second direction". Figure 2 In the exhaust gas recirculation valve 100 shown, the first direction is the direction from the actuator 101 toward the valve core 121 , and the second direction is the direction from the valve core 121 toward the actuator 101 .

[0046] The bearing 160 is inserted into the valve shaft 120 , and allows the valve shaft 120 to slide in the axial direction, thereby stabilizing the linear motion of the valve shaft 120 .

[0047] The electric rod 180 scrapes off powder particles such as coal contained in the exhaust gas adhering to the valve shaft 120 from the valve shaft 120 .

[0048] The second sealing portion 170 has a hole through which the valve shaft 120 is inserted, and the hole abuts against the inserted valve shaft 120 in the radial side (hereinafter referred to as "radial") of the valve shaft 120 over the entire circumference (hereinafter referred to as "circumferential") of the valve shaft 120. The second sealing portion 170 prevents the exhaust gas flowing into the housing 110 from the exhaust gas side circulation pipe 50 from flowing around the valve shaft 120 in the direction in which the actuator 101 is arranged.

[0049] The second sealing portion 170 is made of a resin material such as PTFE (fluorocarbon resin). If the second sealing portion 170 fastens the valve shaft 120 too tightly in the radial direction, the linear motion of the valve shaft 120 will be hindered. Therefore, the second sealing portion 170 keeps the valve shaft 120 fastened in the radial direction to a degree that does not hinder the linear motion of the valve shaft 120, and suppresses the exhaust gas from flowing around the valve shaft 120 in the direction where the actuator 101 is arranged.

[0050] Even if the EGR valve 100 includes the second sealing portion 170 , exhaust gas flowing into the housing 110 from a slight gap between the second sealing portion 170 and the valve shaft 120 may sometimes flow through the gap in a direction where the actuator 101 is disposed.

[0051] The first partition 130 is a member provided on the inner wall of the housing 110 (hereinafter referred to as the "inner wall") opposite to the radial side of the valve shaft 120 in a manner of surrounding the valve shaft 120 along the circumferential direction. Specifically, the first partition 130 is a member having a first hole protruding from the inner wall toward the valve shaft 120 and through which the valve shaft 120 is inserted with a gap between the first partition 130 and the valve shaft 120.

[0052] For example, the first partition portion 130 is formed of a flat plate having a first hole through which the valve shaft 120 is inserted. Specifically, for example, the first partition portion 130 is formed of a circular flat plate having a first hole.

[0053] In addition, the first partition 130 is not limited to being formed of a flat plate.

[0054] The second partition 140 is a member provided on the inner wall opposite to the radial side of the valve shaft 120 in a manner of surrounding the valve shaft 120 along the circumferential direction, and is located closer to the actuator 101 than the position where the first partition 130 is provided. Specifically, the second partition 140 protrudes from the inner wall toward the valve shaft 120 and has a second hole through which the valve shaft 120 is inserted.

[0055] For example, the second partition 140 is formed of a bearing different from the bearing 160. When the second partition 140 is formed of a bearing, the second partition 140 allows the valve shaft 120 to slide in the axial direction. By forming the second partition 140 with a bearing, the linear motion of the valve shaft 120 can be stabilized.

[0056] The second partition 140 is not limited to being formed by a bearing. For example, the second partition 140 may be formed by a flat plate having a second hole through which the valve shaft 120 is inserted. Specifically, for example, the second partition 140 may be formed by a circular flat plate having a second hole.

[0057] In the first embodiment, a case where the second partition portion 140 is formed of a bearing is described.

[0058] The sealing portion 150, i.e., the first sealing portion 150, is a member provided on the radial side of the valve shaft 120 in a manner of surrounding the valve shaft 120 along the circumferential direction. Specifically, the first sealing portion 150 protrudes from the side toward the inner wall, and abuts against the first partition portion 130 when the valve shaft 120 moves linearly along the first direction, and abuts against the second partition portion 140 when the valve shaft 120 moves linearly along the second direction, which is opposite to the first direction.

[0059] The first sealing portion 150 is fixed to the valve shaft 120 , for example.

[0060] By configuring in the above manner, the exhaust gas recirculation valve 100 can suppress the exhaust gas flowing into the housing 110 from flowing in the direction in which the actuator 101 is arranged.

[0061] The housing 110 is Figure 2 As shown, an air hole 111 for connecting a pipe communicating with external air may be provided near the position where the first partition 130 is provided on the inner wall, that is, at a position closer to the valve core 121 than this position.

[0062] With the above configuration, the exhaust gas flowing into the space on the valve body side of the first partition portion 130 can be discharged to the outside air through the large air hole 111 .

[0063] The first partition 130 is made of a metal material such as stainless steel or a thermoplastic resin, etc. The first partition 130 is a member against which the first sealing portion 150 repeatedly contacts, and therefore is preferably made of a metal material from the viewpoint of durability.

[0064] In addition, the first partition 130 may also be formed integrally with a bushing that fixes the second partition 140 .

[0065] The first partition 130 is formed integrally with the bushing that fixes the second partition 140 , so that the strength of the portion of the first partition 130 that is fixed to the inner wall can be increased, thereby improving the durability of the first partition 130 .

[0066] In addition, the first partition 130 is preferably as follows Figure 2 As shown, the surface on the valve core 121 side is inclined toward the valve core 121 side as it is closer to the valve shaft 120 .

[0067] The valve core 121 side of the first partition 130 is provided with a Figure 2 As shown in FIG. 1 , the first partition 130 can guide the exhaust gas flowing toward the valve core 121 side in the first partition 130 to the inner wall. As a result, the surface of the first partition 130 on the valve core 121 side is inclined as shown in FIG. Figure 2 As shown in FIG. 1 , the exhaust gas recirculation valve 100 can effectively suppress the exhaust gas flowing into the housing 110 from flowing in the direction in which the actuator 101 is arranged.

[0068] The first sealing portion 150 is preferably made of PTFE, thermoplastic resin, or elastic resin or silicone, etc. The first sealing portion 150 is made of thermoplastic resin, elastic resin or silicone, etc., which can effectively prevent the exhaust gas flowing into the housing 110 from flowing in the direction where the actuator 101 is arranged.

[0069] In addition, the first sealing portion 150 is preferably as follows Figure 2 As shown, the surface on the actuator 101 side is inclined toward the valve element 121 side as it approaches the inner wall facing the side surface of the valve shaft 120 in the radial direction.

[0070] The surface of the first sealing portion 150 on the actuator 101 side is formed by Figure 2 As shown in FIG. 1 , the first sealing portion 150 guides the exhaust gas that collides with the surface of the second sealing portion 150 on the actuator 101 side to the inner wall when the valve shaft 120 moves linearly along the second direction. As a result, the surface of the first sealing portion 150 on the valve core 101 side is tilted as shown in FIG. Figure 2 As shown in FIG. 1 , the exhaust gas recirculation valve 100 can effectively suppress the exhaust gas flowing into the housing 110 from flowing in the direction in which the actuator 101 is arranged.

[0071] The first sealing portion 150 may not be fixed to the valve shaft 120 in the axial direction.

[0072] Specifically, for example, the first sealing portion 150 has a sealing hole through which the valve shaft 120 is inserted, and slides in the axial direction relative to the valve shaft 120 while being in contact with the first partition portion 130 or the second partition portion 140 and maintaining the contact.

[0073] When the first sealing portion 150 slides in the axial direction relative to the valve shaft 120 , the first sealing portion 150 is preferably made of, for example, PTFE.

[0074] By being constructed in the above manner, the exhaust gas recirculation valve 100 can shorten the interval between the first partition 130 and the second partition 140 relative to the distance of the linear movement of the valve shaft 120. Therefore, even if there are processing errors or assembly errors in each component, the exhaust gas flowing into the housing 110 can be effectively suppressed from flowing in the direction where the actuator 101 is configured.

[0075] Furthermore, the exhaust gas recirculation valve 100 can shorten the interval between the first partition 130 and the second partition 140 relative to the distance of the linear movement of the valve shaft 120, and thus can reduce the interval between the first seal 150 and the second partition 140 in a state where the first seal 150 abuts against the first partition 130, and the interval between the first seal 150 and the first partition 130 in a state where the first seal 150 abuts against the second partition 140. As a result, by configuring in the above manner, the exhaust gas recirculation valve 100 can effectively suppress the exhaust gas that has flowed into the housing 110 from flowing in the direction in which the actuator 101 is arranged.

[0076] As described above, the exhaust gas recirculation valve 100 is a lift-type exhaust gas recirculation valve 100, comprising: an actuator 101, wherein the actuator 101 is provided with a valve shaft 120 protrudingly, wherein the valve shaft 120 has a valve core 121 fixed at one end thereof and moves linearly along the axial direction; a housing 110, wherein the housing 110 forms a flow path for the exhaust gas and through which the valve shaft 120 is inserted; a first partition 130, wherein the first partition 130 is provided on an inner wall of the housing 110 opposite to a side surface of the valve shaft 120 in a radial direction of the valve shaft 120 in a manner of surrounding the valve shaft 120 along the circumferential direction of the valve shaft 120, wherein the first partition 130 protrudes from the inner wall toward the valve shaft 120 and has a first hole through which the valve shaft 120 is inserted in a manner of leaving a gap between the first partition 130 and the valve shaft 120; and a second partition 140, wherein the second partition The first partition portion 140 is arranged on the inner wall of the housing 110 opposite to the radial side of the valve shaft 120 in a manner of surrounding the valve shaft 120 along the circumferential direction, and is closer to the actuator 101 than the position where the first partition portion 130 is arranged. The second partition portion 140 protrudes toward the valve shaft 120 from the interior and has a second hole for the valve shaft 120 to pass through; and a sealing portion 150, which is arranged on the radial side of the valve shaft 120 in a manner of surrounding the valve shaft 120 along the circumferential direction, and the sealing portion 150 protrudes from the side toward the inner wall of the housing 110, and abuts against the first partition portion 130 when the valve shaft 120 moves linearly along the first direction, and abuts against the second partition portion 140 when the valve shaft 120 moves linearly along the second direction which is opposite to the first direction.

[0077] With the above configuration, the exhaust gas recirculation valve 100 can keep the sliding resistance of the valve shaft 120 constant when the valve shaft 120 moves linearly, and can suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator 101 .

[0078] In addition, the exhaust gas recirculation valve 100 has the above-mentioned structure, and the first partition portion 130 is formed of a flat plate having a first hole.

[0079] With the above configuration, the exhaust gas recirculation valve 100 can keep the sliding resistance of the valve shaft 120 constant when the valve shaft 120 moves linearly, and can suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator 101 .

[0080] In addition, the exhaust gas recirculation valve 100 has the above-mentioned structure, and the first partition portion 130 is formed of a circular flat plate having a first hole.

[0081] With the above configuration, the exhaust gas recirculation valve 100 can keep the sliding resistance of the valve shaft 120 constant when the valve shaft 120 linearly moves, and can suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator 101 .

[0082] In addition, the exhaust gas recirculation valve 100 is structured in the above manner, in which the first partition 130 and the bushing that fixes the second partition 140 are formed as one body.

[0083] With the above configuration, the EGR valve 100 can maintain a constant sliding resistance of the valve shaft 120 when the valve shaft 120 linearly moves, suppress exhaust gas flowing into the EGR valve from flowing into the actuator 101 , and improve the durability of the first partition 130 .

[0084] In addition, in the exhaust gas recirculation valve 100 , in addition to the above-described structure, the first partition portion 130 is configured such that the portion of the surface on the valve body 121 side thereof is inclined toward the valve body 121 side as it approaches the valve shaft 120 .

[0085] With the above configuration, the exhaust gas recirculation valve 100 can keep the sliding resistance of the valve shaft 120 constant when the valve shaft 120 moves linearly, and can effectively suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator 101 .

[0086] In addition, in the exhaust gas recirculation valve 100 , in addition to the above-described structure, the sealing portion 150 is configured such that the sealing portion 150 is inclined toward the valve element 121 as it approaches the inner wall of the housing 110 facing the side surface of the valve shaft 120 in the radial direction.

[0087] With the above configuration, the exhaust gas recirculation valve 100 can keep the sliding resistance of the valve shaft 120 constant when the valve shaft 120 moves linearly, and can effectively suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator 101 .

[0088] In addition, in the exhaust gas recirculation valve 100 , the sealing portion 150 has a sealing hole through which the valve shaft 120 is inserted, and slides axially relative to the valve shaft 120 while maintaining the state of contact with the first partition 130 or the second partition 140 .

[0089] Furthermore, by configuring in the above manner, even if there are processing errors or assembly errors in each component, the exhaust gas recirculation valve 100 can effectively suppress the exhaust gas flowing into the housing 110 from flowing in the direction where the actuator 101 is arranged.

[0090] Furthermore, by configuring in this manner, the exhaust gas recirculation valve 100 can keep the sliding resistance of the valve shaft 120 constant when the valve shaft 120 moves linearly, and can effectively suppress the exhaust gas flowing into the exhaust gas recirculation valve from flowing into the actuator 101 .

[0091] In addition, in the exhaust gas recirculation valve 100 , in addition to the above-described structure, the second partition portion 140 is formed by a bearing that allows the valve shaft 120 to slide in the axial direction.

[0092] With the above configuration, the EGR valve 100 can maintain a constant sliding resistance of the valve shaft 120 when the valve shaft 120 moves linearly, and can suppress the exhaust gas flowing into the EGR valve from flowing into the actuator 101 while stabilizing the linear movement of the valve shaft 120 .

[0093] In addition, the present disclosure can modify any constituent elements in the embodiments, or can omit any constituent elements in the embodiments within the scope of the disclosure.

[0094] Industrial Applicability

[0095] The exhaust gas recirculation valve of the present disclosure can be applied to an internal combustion engine system.

[0096] (Explanation of symbols)

[0097] 1 Internal combustion engine system; 10 Internal combustion engine; 20 Intake pipe; 30 Exhaust pipe; 40 Turbine; 50 Exhaust side circulation piping; 60 Intake side circulation piping; 100 Exhaust gas recirculation valve; 101 Actuator; 110 Housing; 111 Large pore; 120 Valve shaft; 121 Valve core; 122 Valve seat; 130 First partition; 140 Second partition; 150 Sealing portion (first sealing portion); 160 Bearing; 170 Sealing portion (second sealing portion); 180 Electric rod.

Claims

1. A lifting exhaust gas recirculation valve, characterized in that: include: An actuator, wherein the actuator is protrudingly provided with a valve shaft, a valve core is fixed at one end of the valve shaft, and the valve shaft moves linearly along the axial direction; a housing, the housing forming a flow path for exhaust gas and allowing the valve shaft to pass therethrough; a first partition portion, the first partition portion being provided on an inner wall of the housing opposite to a side surface of the valve shaft in a radial direction of the valve shaft in such a manner as to surround the valve shaft along a circumferential direction of the valve shaft, the first partition portion protruding from the inner wall toward the valve shaft, and having a first hole for inserting the valve shaft through in such a manner as to leave a gap between the first partition portion and the valve shaft; a second partition portion, the second partition portion being provided on the inner wall of the housing opposite to the side surface of the valve shaft in the radial direction and located closer to the actuator than the position where the first partition portion is provided so as to surround the valve shaft along the circumferential direction, the second partition portion protruding from the inner wall toward the valve shaft and having a second hole through which the valve shaft is inserted; as well as A sealing portion, wherein the sealing portion is arranged on the radial side of the valve shaft in a manner of surrounding the valve shaft along the circumferential direction, the sealing portion protrudes from the side toward the inner wall of the outer shell, and abuts against the first partition portion when the valve shaft moves linearly along a first direction, and abuts against the second partition portion when the valve shaft moves linearly along a second direction which is opposite to the first direction.

2. The exhaust gas recirculation valve according to claim 1, characterized in that The first partition is a flat plate having the first hole.

3. The exhaust gas recirculation valve according to claim 2, characterized in that The first partition is the circular flat plate having the first hole.

4. The exhaust gas recirculation valve according to claim 1, characterized in that The first partition is formed integrally with a bushing that fixes the second partition.

5. The exhaust gas recirculation valve according to claim 1, characterized in that The surface of the seal portion on the actuator side is inclined toward the valve element as it approaches the inner wall of the housing facing the side surface of the valve shaft in the radial direction.

6. The exhaust gas recirculation valve according to claim 1, characterized in that The sealing portion includes a sealing hole through which the valve shaft is inserted, and slides relative to the valve shaft in the axial direction while being in contact with the first partition portion or the second partition portion and maintaining the contact state.

7. The exhaust gas recirculation valve according to claim 1, characterized in that The second partition portion is a bearing that allows the valve shaft to slide in the axial direction.

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