WO2019244346A1 - Exhaust gas recirculation valve - Google Patents

Exhaust gas recirculation valve Download PDF

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Publication number
WO2019244346A1
WO2019244346A1 PCT/JP2018/023835 JP2018023835W WO2019244346A1 WO 2019244346 A1 WO2019244346 A1 WO 2019244346A1 JP 2018023835 W JP2018023835 W JP 2018023835W WO 2019244346 A1 WO2019244346 A1 WO 2019244346A1
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WO
WIPO (PCT)
Prior art keywords
housing
exhaust gas
gas recirculation
recirculation valve
lower housing
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PCT/JP2018/023835
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French (fr)
Japanese (ja)
Inventor
孝治 弓達
Original Assignee
三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2018/023835 priority Critical patent/WO2019244346A1/en
Publication of WO2019244346A1 publication Critical patent/WO2019244346A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor

Definitions

  • the present invention relates to an exhaust gas recirculation valve (hereinafter, referred to as an EGR valve).
  • the EGR valve is provided in an exhaust gas passage connected to the exhaust gas passage of the engine, and is used to control the amount of exhaust gas flowing through the exhaust gas passage. Since high-temperature exhaust gas flows into the exhaust gas passage, it is necessary for the EGR valve to protect the actuator for driving the valve from high heat.
  • the housing is divided into an upper housing and a lower housing, and the upper housing provided with the actuator unit is cooled to suppress the influence of heat.
  • the present invention has been made to solve the above problems, and has as its object to obtain an EGR valve capable of reducing the number of bolted portions.
  • An EGR valve is provided with an actuator section, a first housing for accommodating a valve shaft that is axially operated by the actuator section, and a valve body connected to the valve shaft, and the first housing is provided in the first housing.
  • the first temporary assembly provided in the second temporary assembly, the first housing and the second housing, the projection is press-fitted into the recess, and the first temporary assembly is temporarily assembled by the second temporary assembly.
  • Both the housing and the second housing include a flange portion that is bolted to a mounting portion on the engine side.
  • the first housing and the second housing temporarily assembled by the first temporary assembly and the second temporary assembly by press-fitting the projections into the recesses are both bolted to the mounting portion on the engine side. Be concluded. Thus, it is not necessary to bolt the first housing and the second housing separately from the attachment to the engine, and the number of bolt fastening portions can be reduced.
  • FIG. 2 is a top view showing the EGR valve according to Embodiment 1 of the present invention.
  • FIG. 2 is a partial cross-sectional view illustrating a configuration of an EGR valve according to Embodiment 1.
  • FIG. 2 is a perspective view showing an assembly part of an upper housing and a lower housing included in the EGR valve according to the first embodiment.
  • FIG. 1 is a top view showing an EGR valve 1 according to Embodiment 1 of the present invention.
  • FIG. 2 is a partial cross-sectional view showing the configuration of the EGR valve 1.
  • the upper housing 3 and the lower housing 4 of the EGR valve 1 and the engine-side pocket 100 are cut along the line AA in FIG.
  • FIG. 3 is a perspective view showing an assembly part of the upper housing 3 and the lower housing 4 provided in the EGR valve 1. 3, the illustration of the valve shaft 7 and the valve body 8 is omitted.
  • the EGR valve 1 is a valve that controls an amount of exhaust gas flowing through an exhaust gas passage, and includes an actuator unit 2, an upper housing 3, and a lower housing 4.
  • the actuator section 2 is fastened and fixed to the upper portion of the upper housing 3 using screws 5, and a motor is provided inside.
  • the motor is rotationally driven by the electric power supplied from the connector section 2a, and the valve shaft 7 operates in the axial direction by the rotational driving force of the motor.
  • a valve body 8 is connected to an end of the valve shaft 7.
  • the valve element 8 contacts or separates from the valve seat 4d in accordance with the axial movement of the valve shaft 7.
  • the valve seat 4d is formed inside the lower housing 4 as shown in FIG. 2, and the valve body 8 comes into contact with or separates from the valve seat 4d in accordance with the axial movement of the valve shaft 7, so that the lower housing 4d is formed.
  • the amount of the exhaust gas flowing through the exhaust gas passage formed inside 4 is controlled.
  • the upper housing 3 is a first housing to which the actuator unit 2 is attached, and which accommodates the valve shaft 7 that operates in the axial direction by the actuator unit 2.
  • the lower housing 4 is a second housing that accommodates the valve element 8 connected to the valve shaft 7 and is assembled to the upper housing 3.
  • the lower housing 4 is a member having an exhaust gas passage formed therein and exposed to high-temperature exhaust gas. Therefore, a heat-resistant material is used as the material of the lower housing 4.
  • the lower housing 4 may be made of a cast iron material.
  • the upper housing 3 is provided with a water cooling passage 9 through which cooling water flows. Therefore, in order to prevent rust due to cooling water, for example, an aluminum material is used as the material of the upper housing 3.
  • a cylindrical convex portion 3 a is formed, and on the upper surface of the lower housing 4, a concave portion 4 a is formed.
  • the convex portion 3a is a first temporary assembly portion through which the valve shaft 7 penetrates, and the concave portion 4a is a second temporary assembly portion press-fit into the convex portion 3a.
  • the upper housing 3 and the lower housing 4 are temporarily assembled by press-fitting the convex portions 3a into the concave portions 4a.
  • the temporary assembly is a state in which the convex portion 3a is press-fitted into the concave portion 4a and the positional relationship between the upper housing 3 and the lower housing 4 is maintained.
  • the flange 3c and the flange 3d are provided so as to protrude from the outer periphery of the upper housing 3, and have a through hole through which the bolt 6 passes.
  • the flanges 4b and 4c are provided so as to protrude from the outer periphery of the lower housing 4, and have through holes through which the bolts 6 pass.
  • a screw hole into which the bolt 6 is screwed is formed in the pocket 100 which is an attachment portion on the engine side.
  • both the upper housing 3 and the lower housing 4 temporarily assembled as described above are fastened to the engine side pocket 100 using the bolts 6 by using the bolts 6.
  • the 3d and the flange 4c are fastened to the engine-side pocket 100.
  • the temporarily assembled upper housing 3 and lower housing 4 are fastened together to the engine-side pocket 100.
  • a portion indicated by reference numeral B in FIG. 1 is a bolt fastening portion for fixing the lower housing and the pocket on the engine side.
  • the temporarily assembled upper housing 3 and lower housing 4 are fastened to the pocket 100 together. For this reason, it is not necessary to fasten the bolt at the location indicated by the reference symbol B, and the number of locations for fastening the bolt can be reduced. This also facilitates the work of assembling the EGR valve 1 into the engine-side pocket 100.
  • the projection 3a is firmly pressed into the recess 4a.
  • the valve shaft 7 penetrates the center of the convex portion 3a, when the outer diameter of the convex portion 3a is reduced by press fitting, the movement of the valve shaft 7 may be affected.
  • a groove 3b is formed between the central portion and the outer peripheral portion of the convex portion 3a along the circumferential direction of the end face of the convex portion 3a.
  • the groove 3b absorbs a reduction in the outer diameter of the projection 3a due to press fitting. Therefore, even if the protrusion 3a is pressed into the recess 4a, the reduction in the outer diameter of the protrusion 3a does not hinder the movement of the valve shaft 7 at the center of the protrusion 3a.
  • the temperature may exceed the permissible temperature with a normal O-ring. Therefore, the leakage of the exhaust gas from between the lower housing 4 and the pocket 100 depends on the clearance between the lower housing 4 and the pocket 100. If there is a difference between the linear expansion coefficient of the lower housing 4 and the linear expansion coefficient of the pocket 100, the clearance increases with a change in temperature. Therefore, the lower housing 4 may be made of a material having the same linear expansion coefficient as the pocket 100. Thereby, it is possible to suppress the leakage of the exhaust gas due to the expansion of the clearance due to the difference in the coefficient of linear expansion.
  • the configuration in which the upper housing 3 has the convex portion 3a and the lower housing 4 has the concave portion 4a has been described, but the first temporary assembling portion which is the concave portion is provided in the upper housing 3, and the lower housing 4 has the convex portion. May be provided. Even with this configuration, a temporary assembly of the upper housing 3 and the lower housing 4 is possible.
  • a groove is also formed between the center and the outer periphery of the projection provided on the lower housing 4 along the circumferential direction of the end face of the projection.
  • both the upper housing 3 and the lower housing 4 in which the convex portions 3a are press-fitted into the concave portions 4a are formed by the flange portions 3c, 3d, 4b, and 4c. 100 is bolted. This eliminates the need for bolting the upper housing 3 and the lower housing 4 separately from attachment to the engine-side pocket 100, and can reduce the number of bolted locations.
  • the convex portion 3a has a groove 3b between the central portion and the outer peripheral portion for absorbing a reduction in outer diameter due to press fitting.
  • the lower housing 4 is made of a material having the same linear expansion coefficient as the pocket 100 on the engine side. Thereby, it is possible to suppress the leakage of the exhaust gas due to the expansion of the clearance due to the difference in the linear expansion coefficient.
  • the EGR valve according to the present invention can be used for an EGR device of an automobile engine because the number of bolted portions can be reduced.

Abstract

An EGR valve (1) is configured such that an upper housing (3) and a lower housing (4), in which a protrusion (3a) is press-fitted in a recess (4a), are both fastened at flange sections (3c, 3d, 4b, 4c) to an engine-side pocket (100) by bolts.

Description

排気ガス再循環バルブExhaust gas recirculation valve
　この発明は、排気ガス再循環バルブ（以下、ＥＧＲバルブと記載する）に関する。 The present invention relates to an exhaust gas recirculation valve (hereinafter, referred to as an EGR valve).
　ＥＧＲバルブは、エンジンの排気ガス環流路に連通された排気ガス通路に設けられて、排気ガス通路を流れる排気ガス量を制御するために用いられる。排気ガス通路には、高温の排気ガスが流入するため、ＥＧＲバルブでは、弁を駆動させるアクチュエータ部を高熱から守る必要がある。例えば、特許文献１に記載されるＥＧＲバルブは、ハウジングが、上ハウジングと下ハウジングとに分けられ、アクチュエータ部が設けられた上ハウジングを冷却して熱の影響を抑えている。 The EGR valve is provided in an exhaust gas passage connected to the exhaust gas passage of the engine, and is used to control the amount of exhaust gas flowing through the exhaust gas passage. Since high-temperature exhaust gas flows into the exhaust gas passage, it is necessary for the EGR valve to protect the actuator for driving the valve from high heat. For example, in the EGR valve described in Patent Document 1, the housing is divided into an upper housing and a lower housing, and the upper housing provided with the actuator unit is cooled to suppress the influence of heat.
特開平４－２４６２６９号公報JP-A-4-246269
　特許文献１に記載されたＥＧＲバルブは、上ハウジングと下ハウジングがボルトで締結され、さらに、下ハウジングがエンジン側のポケットにボルトで締結されるので、ボルト締結箇所が多く、組み立て作業が煩雑になるという課題があった。 In the EGR valve described in Patent Literature 1, the upper housing and the lower housing are fastened with bolts, and the lower housing is fastened with bolts to the engine-side pocket. There was a problem of becoming.
　この発明は上記課題を解決するもので、ボルト締結箇所を削減することができるＥＧＲバルブを得ることを目的とする。 The present invention has been made to solve the above problems, and has as its object to obtain an EGR valve capable of reducing the number of bolted portions.
　この発明に係るＥＧＲバルブは、アクチュエータ部が設けられ、アクチュエータ部によって軸方向に動作する弁軸を収容する第１のハウジングと、弁軸に接続された弁体を収容し、第１のハウジングに組み付けられる第２のハウジングと、第１のハウジングに設けられ、弁軸が通っている凸部または凹部である第１の仮組み部と、第２のハウジングに設けられ、凹部または凸部である第２の仮組み部と、第１のハウジングおよび第２のハウジングに設けられ、凸部が凹部に圧入されて第１の仮組み部と第２の仮組み部によって仮組みされた第１のハウジングおよび第２のハウジングがともにエンジン側の取り付け部にボルト締結される鍔部とを備える。 An EGR valve according to the present invention is provided with an actuator section, a first housing for accommodating a valve shaft that is axially operated by the actuator section, and a valve body connected to the valve shaft, and the first housing is provided in the first housing. A second housing to be assembled, a first temporary assembly portion provided on the first housing and being a convex portion or a concave portion through which the valve shaft passes, and a concave portion or a convex portion provided on the second housing. The first temporary assembly provided in the second temporary assembly, the first housing and the second housing, the projection is press-fitted into the recess, and the first temporary assembly is temporarily assembled by the second temporary assembly. Both the housing and the second housing include a flange portion that is bolted to a mounting portion on the engine side.
　この発明によれば、凸部が凹部に圧入されて第１の仮組み部と第２の仮組み部によって仮組みされた第１のハウジングおよび第２のハウジングがともにエンジン側の取り付け部にボルト締結される。これにより、エンジン側への取り付けとは別に第１のハウジングおよび第２のハウジングをボルト締結する必要がなくなり、ボルト締結箇所を削減することができる。 According to the present invention, the first housing and the second housing temporarily assembled by the first temporary assembly and the second temporary assembly by press-fitting the projections into the recesses are both bolted to the mounting portion on the engine side. Be concluded. Thus, it is not necessary to bolt the first housing and the second housing separately from the attachment to the engine, and the number of bolt fastening portions can be reduced.
この発明の実施の形態１に係るＥＧＲバルブを示す上面図である。FIG. 2 is a top view showing the EGR valve according to Embodiment 1 of the present invention. 実施の形態１に係るＥＧＲバルブの構成を示す部分断面図である。FIG. 2 is a partial cross-sectional view illustrating a configuration of an EGR valve according to Embodiment 1. 実施の形態１に係るＥＧＲバルブが備える上ハウジングと下ハウジングとの組み付け部分を示す斜視図である。FIG. 2 is a perspective view showing an assembly part of an upper housing and a lower housing included in the EGR valve according to the first embodiment.
　以下、この発明をより詳細に説明するため、この発明を実施するための形態について、添付の図面に従って説明する。
実施の形態１．
　図１は、この発明の実施の形態１に係るＥＧＲバルブ１を示す上面図である。図２は、ＥＧＲバルブ１の構成を示す部分断面図であり、図１のＡ－Ａ線に沿ってＥＧＲバルブ１が備える上ハウジング３および下ハウジング４と、エンジン側のポケット１００とが切断された部分断面を示している。図３は、ＥＧＲバルブ１が備える上ハウジング３と下ハウジング４との組み付け部分を示す斜視図である。図３において、弁軸７と弁体８の記載を省略している。図１および図２に示すように、ＥＧＲバルブ１は、排気ガス通路を流れる排気ガス量を制御するバルブであり、アクチュエータ部２、上ハウジング３および下ハウジング４を備える。 Hereinafter, in order to explain this invention in greater detail, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a top view showing an EGR valve 1 according to Embodiment 1 of the present invention. FIG. 2 is a partial cross-sectional view showing the configuration of the EGR valve 1. The upper housing 3 and the lower housing 4 of the EGR valve 1 and the engine-side pocket 100 are cut along the line AA in FIG. FIG. FIG. 3 is a perspective view showing an assembly part of the upper housing 3 and the lower housing 4 provided in the EGR valve 1. 3, the illustration of the valve shaft 7 and the valve body 8 is omitted. As shown in FIGS. 1 and 2, the EGR valve 1 is a valve that controls an amount of exhaust gas flowing through an exhaust gas passage, and includes an actuator unit 2, an upper housing 3, and a lower housing 4.
　アクチュエータ部２は、ねじ５を用いて上ハウジング３の上部に締結固定されており、内部にモータが設けられている。モータは、コネクタ部２ａから供給された電力によって回転駆動し、モータの回転駆動力によって弁軸７が軸方向に動作する。弁軸７の端部には弁体８が接続されている。弁体８は、弁軸７の軸方向の移動に合わせて弁座４ｄに対して接触または離間する。弁座４ｄは、図２に示すように下ハウジング４の内部に形成されており、弁軸７の軸方向の移動に合わせて弁体８が弁座４ｄに接触または離間することで、下ハウジング４の内部に形成された排気ガス通路を流れる排気ガス量が制御される。 The actuator section 2 is fastened and fixed to the upper portion of the upper housing 3 using screws 5, and a motor is provided inside. The motor is rotationally driven by the electric power supplied from the connector section 2a, and the valve shaft 7 operates in the axial direction by the rotational driving force of the motor. A valve body 8 is connected to an end of the valve shaft 7. The valve element 8 contacts or separates from the valve seat 4d in accordance with the axial movement of the valve shaft 7. The valve seat 4d is formed inside the lower housing 4 as shown in FIG. 2, and the valve body 8 comes into contact with or separates from the valve seat 4d in accordance with the axial movement of the valve shaft 7, so that the lower housing 4d is formed. The amount of the exhaust gas flowing through the exhaust gas passage formed inside 4 is controlled.
　上ハウジング３は、アクチュエータ部２が取り付けられ、アクチュエータ部２によって軸方向に動作する弁軸７を収容する第１のハウジングである。また、下ハウジング４は、弁軸７に接続された弁体８を収容し、上ハウジング３に組み付けられる第２のハウジングである。下ハウジング４は、排気ガス通路が内部に形成され、高温の排気ガスに曝される部材である。従って、下ハウジング４の材料には、耐熱材が用いられる。例えば、下ハウジング４は鋳鉄材で構成してもよい。下ハウジング４を介して上ハウジング３に伝わる熱の影響を低減するために、上ハウジング３には、冷却水を流す水冷通路９が設けられる。そこで、冷却水による錆びを防止するために、上ハウジング３の材料には、例えばアルミニウム材料が用いられる。 The upper housing 3 is a first housing to which the actuator unit 2 is attached, and which accommodates the valve shaft 7 that operates in the axial direction by the actuator unit 2. The lower housing 4 is a second housing that accommodates the valve element 8 connected to the valve shaft 7 and is assembled to the upper housing 3. The lower housing 4 is a member having an exhaust gas passage formed therein and exposed to high-temperature exhaust gas. Therefore, a heat-resistant material is used as the material of the lower housing 4. For example, the lower housing 4 may be made of a cast iron material. In order to reduce the influence of heat transmitted to the upper housing 3 via the lower housing 4, the upper housing 3 is provided with a water cooling passage 9 through which cooling water flows. Therefore, in order to prevent rust due to cooling water, for example, an aluminum material is used as the material of the upper housing 3.
　また、上ハウジング３の下面には、図２および図３に示すように、筒形状の凸部３ａが形成されており、下ハウジング４の上面には、凹部４ａが形成されている。凸部３ａは、弁軸７が貫通している第１の仮組み部であり、凹部４ａは、凸部３ａに圧入される第２の仮組み部である。凸部３ａが凹部４ａに圧入されることにより、上ハウジング３と下ハウジング４が仮組みされる。仮組みとは、凸部３ａが凹部４ａに圧入されて上ハウジング３と下ハウジング４との位置関係が保持された状態である。 お よ び Further, on the lower surface of the upper housing 3, as shown in FIGS. 2 and 3, a cylindrical convex portion 3 a is formed, and on the upper surface of the lower housing 4, a concave portion 4 a is formed. The convex portion 3a is a first temporary assembly portion through which the valve shaft 7 penetrates, and the concave portion 4a is a second temporary assembly portion press-fit into the convex portion 3a. The upper housing 3 and the lower housing 4 are temporarily assembled by press-fitting the convex portions 3a into the concave portions 4a. The temporary assembly is a state in which the convex portion 3a is press-fitted into the concave portion 4a and the positional relationship between the upper housing 3 and the lower housing 4 is maintained.
　鍔部３ｃおよび鍔部３ｄは、上ハウジング３の外周から突出して設けられ、ボルト６を通す貫通穴が形成されている。また、鍔部４ｂおよび鍔部４ｃは、下ハウジング４の外周から突出して設けられ、ボルト６を通す貫通穴が形成されている。エンジン側の取り付け部であるポケット１００には、ボルト６が螺合されるねじ穴が形成されている。仮組みされた上ハウジング３および下ハウジング４では、鍔部３ｃに鍔部４ｂが重なり、鍔部３ｄに鍔部４ｃが重なって、各々の貫通穴が合わさっている。 The flange 3c and the flange 3d are provided so as to protrude from the outer periphery of the upper housing 3, and have a through hole through which the bolt 6 passes. The flanges 4b and 4c are provided so as to protrude from the outer periphery of the lower housing 4, and have through holes through which the bolts 6 pass. A screw hole into which the bolt 6 is screwed is formed in the pocket 100 which is an attachment portion on the engine side. In the temporarily assembled upper housing 3 and lower housing 4, the flange portion 4b overlaps the flange portion 3c, and the flange portion 4c overlaps the flange portion 3d, and the respective through holes are aligned.
　図２に示すように、前述のように仮組みされた上ハウジング３および下ハウジング４はともに、ボルト６を用いて、鍔部３ｃと鍔部４ｂがエンジン側のポケット１００に締結され、鍔部３ｄと鍔部４ｃがエンジン側のポケット１００に締結される。これにより、仮組みされた上ハウジング３および下ハウジング４が、エンジン側のポケット１００に対して共締めされる。 As shown in FIG. 2, both the upper housing 3 and the lower housing 4 temporarily assembled as described above are fastened to the engine side pocket 100 using the bolts 6 by using the bolts 6. The 3d and the flange 4c are fastened to the engine-side pocket 100. Thus, the temporarily assembled upper housing 3 and lower housing 4 are fastened together to the engine-side pocket 100.
　従来のＥＧＲバルブは、上ハウジングと下ハウジングとがボルト締結によって組み付けられ、上ハウジングが組み付けられた下ハウジングがエンジン側のポケットにボルト締結される。このため、従来のＥＧＲバルブでは、例えば、図１において、符号Ｂで示す箇所が、下ハウジングとエンジン側のポケットとを固定するボルト締結箇所となる。 In the conventional EGR valve, the upper housing and the lower housing are assembled by bolting, and the lower housing with the upper housing assembled is bolted to a pocket on the engine side. For this reason, in the conventional EGR valve, for example, a portion indicated by reference numeral B in FIG. 1 is a bolt fastening portion for fixing the lower housing and the pocket on the engine side.
　これに対して、実施の形態１に係るＥＧＲバルブ１では、仮組みされた上ハウジング３および下ハウジング４がポケット１００に対して共締めされる。このため、符号Ｂで示す箇所でボルト締結する必要がなく、ボルト締結箇所を削減することが可能である。これにより、ＥＧＲバルブ１をエンジン側のポケット１００に組み付ける作業も容易になる。 On the other hand, in the EGR valve 1 according to the first embodiment, the temporarily assembled upper housing 3 and lower housing 4 are fastened to the pocket 100 together. For this reason, it is not necessary to fasten the bolt at the location indicated by the reference symbol B, and the number of locations for fastening the bolt can be reduced. This also facilitates the work of assembling the EGR valve 1 into the engine-side pocket 100.
　前述したように、仮組みされた上ハウジング３および下ハウジング４は両者の位置関係が保持される必要があるため、凸部３ａは、凹部４ａに強固に圧入される。一方、弁軸７は、凸部３ａの中心部を貫通しているため、圧入によって凸部３ａの外径が縮小すると、弁軸７の動きに影響を与える可能性がある。 As described above, since the upper housing 3 and the lower housing 4 that have been temporarily assembled need to maintain the positional relationship between them, the projection 3a is firmly pressed into the recess 4a. On the other hand, since the valve shaft 7 penetrates the center of the convex portion 3a, when the outer diameter of the convex portion 3a is reduced by press fitting, the movement of the valve shaft 7 may be affected.
　そこで、図２および図３に示すように、凸部３ａの中心部と外周部の間には、凸部３ａの端面の周方向に沿って溝部３ｂが形成されている。溝部３ｂは、圧入による凸部３ａの外径の縮小分を吸収する。このため、凸部３ａを凹部４ａに圧入しても、凸部３ａの外径の縮小分が、凸部３ａの中心部において弁軸７の動きを阻害することはない。 Therefore, as shown in FIGS. 2 and 3, a groove 3b is formed between the central portion and the outer peripheral portion of the convex portion 3a along the circumferential direction of the end face of the convex portion 3a. The groove 3b absorbs a reduction in the outer diameter of the projection 3a due to press fitting. Therefore, even if the protrusion 3a is pressed into the recess 4a, the reduction in the outer diameter of the protrusion 3a does not hinder the movement of the valve shaft 7 at the center of the protrusion 3a.
　また、エンジン側のポケット１００に高温の排気ガスが流れる場合、通常のＯリングでは許容温度を超えてしまうため、下ハウジング４とポケット１００との間に配置することはできない。従って、下ハウジング４とポケット１００との間からの排気ガスの漏れは、下ハウジング４とポケット１００との間のクリアランスに左右される。このクリアランスは、下ハウジング４の線膨張係数とポケット１００の線膨張係数との間に差があると、温度変化に伴って拡大する。そこで、下ハウジング４を、ポケット１００と同じ線膨張係数を有する材料で構成してもよい。これにより、線膨張係数の差によるクリアランスの拡大に起因した排気ガスの漏れを抑えることができる。 In addition, when high-temperature exhaust gas flows into the engine-side pocket 100, the temperature may exceed the permissible temperature with a normal O-ring. Therefore, the leakage of the exhaust gas from between the lower housing 4 and the pocket 100 depends on the clearance between the lower housing 4 and the pocket 100. If there is a difference between the linear expansion coefficient of the lower housing 4 and the linear expansion coefficient of the pocket 100, the clearance increases with a change in temperature. Therefore, the lower housing 4 may be made of a material having the same linear expansion coefficient as the pocket 100. Thereby, it is possible to suppress the leakage of the exhaust gas due to the expansion of the clearance due to the difference in the coefficient of linear expansion.
　これまで、上ハウジング３が凸部３ａを有し、下ハウジング４が凹部４ａを有する構成を示したが、上ハウジング３に凹部である第１の仮組み部を設け、下ハウジング４に凸部である第２の仮組み部を設けてもよい。この構成であっても、上ハウジング３と下ハウジング４の仮組みは可能である。なお、下ハウジング４に設けられた凸部の中心部と外周部の間にも、凸部の端面の周方向に沿って溝部が形成される。 Until now, the configuration in which the upper housing 3 has the convex portion 3a and the lower housing 4 has the concave portion 4a has been described, but the first temporary assembling portion which is the concave portion is provided in the upper housing 3, and the lower housing 4 has the convex portion. May be provided. Even with this configuration, a temporary assembly of the upper housing 3 and the lower housing 4 is possible. A groove is also formed between the center and the outer periphery of the projection provided on the lower housing 4 along the circumferential direction of the end face of the projection.
　前述したように、実施の形態１に係るＥＧＲバルブ１において、凸部３ａが凹部４ａに圧入された上ハウジング３および下ハウジング４が共に、鍔部３ｃ，３ｄ，４ｂ，４ｃでエンジン側のポケット１００にボルト締結される。これにより、エンジン側のポケット１００への取り付けとは別に上ハウジング３および下ハウジング４をボルト締結する必要がなくなり、ボルト締結箇所を削減することができる。 As described above, in the EGR valve 1 according to the first embodiment, both the upper housing 3 and the lower housing 4 in which the convex portions 3a are press-fitted into the concave portions 4a are formed by the flange portions 3c, 3d, 4b, and 4c. 100 is bolted. This eliminates the need for bolting the upper housing 3 and the lower housing 4 separately from attachment to the engine-side pocket 100, and can reduce the number of bolted locations.
　実施の形態１に係るＥＧＲバルブ１において、凸部３ａが、圧入による外径の縮小分を吸収する溝部３ｂを中心部と外周部との間に備える。これにより、凸部３ａを凹部４ａに圧入しても、凸部３ａの外径の縮小分が、凸部３ａの中心部において弁軸７の動きを阻害することはない。 In the EGR valve 1 according to the first embodiment, the convex portion 3a has a groove 3b between the central portion and the outer peripheral portion for absorbing a reduction in outer diameter due to press fitting. Thus, even if the convex portion 3a is press-fitted into the concave portion 4a, the reduction in the outer diameter of the convex portion 3a does not hinder the movement of the valve shaft 7 at the center of the convex portion 3a.
　実施の形態１に係るＥＧＲバルブ１において、下ハウジング４が、エンジン側のポケット１００と線膨張係数が同じ材料で構成されている。これにより、線膨張係数の差によるクリアランスの拡大に起因した排気ガスの漏れを抑えることができる。 In the EGR valve 1 according to the first embodiment, the lower housing 4 is made of a material having the same linear expansion coefficient as the pocket 100 on the engine side. Thereby, it is possible to suppress the leakage of the exhaust gas due to the expansion of the clearance due to the difference in the linear expansion coefficient.
　なお、本発明は上記実施の形態に限定されるものではなく、本発明の範囲内において、実施の形態の任意の構成要素の変形もしくは実施の形態の任意の構成要素の省略が可能である。 Note that the present invention is not limited to the above-described embodiment, and within the scope of the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted.
　この発明に係るＥＧＲバルブは、ボルト締結箇所を削減することができるので、自動車用エンジンのＥＧＲ装置に利用可能である。 The EGR valve according to the present invention can be used for an EGR device of an automobile engine because the number of bolted portions can be reduced.
　１　ＥＧＲバルブ、２　アクチュエータ部、２ａ　コネクタ部、３　上ハウジング、３ａ　凸部、３ｂ　溝部、３ｃ，３ｄ　鍔部、４　下ハウジング、４ａ　凹部、４ｂ，４ｃ　鍔部、４ｄ　弁座、５　ねじ、６　ボルト、７　弁軸、８　弁体、９　水冷通路、１００　ポケット。 1 EGR valve, 2 actuator section, 2a connector section, 3 upper housing, 3a convex section, 3b groove section, 3c, 3d flange section, 4 lower housing, 4a concave section, 4b, 4c flange section, 4d valve seat, 5 screw, 6 Bolt, 7mm valve shaft, 8mm valve body, 9cm water cooling passage, 100mm pocket.

Claims (6)

  1. 　アクチュエータ部が設けられ、前記アクチュエータ部によって軸方向に動作する弁軸を収容する第１のハウジングと、
    　前記弁軸に接続された弁体を収容し、前記第１のハウジングに組み付けられる第２のハウジングと、
    　前記第１のハウジングに設けられ、前記弁軸が通っている凸部または凹部である第１の仮組み部と、
    　前記第２のハウジングに設けられ、凹部または凸部である第２の仮組み部と、
    　前記第１のハウジングおよび前記第２のハウジングに設けられ、凸部が凹部に圧入されて前記第１の仮組み部と前記第２の仮組み部によって仮組みされた前記第１のハウジングおよび前記第２のハウジングがともにエンジン側の取り付け部にボルト締結される鍔部とを備えたこと
    　を特徴とする排気ガス再循環バルブ。     A first housing that is provided with an actuator unit and houses a valve shaft that operates in the axial direction by the actuator unit;
    A second housing that houses a valve body connected to the valve shaft and is assembled to the first housing;
    A first temporary assembly part provided in the first housing and being a convex part or a concave part through which the valve shaft passes;
    A second temporary assembly part provided on the second housing and being a concave part or a convex part;
    The first housing provided on the first housing and the second housing, wherein a convex portion is press-fitted into a concave portion and temporarily assembled by the first temporary assembly portion and the second temporary assembly portion. The exhaust gas recirculation valve, wherein both the second housing and the flange portion are bolted to a mounting portion on the engine side.
  2. 　前記凸部の中心部と外周部との間に、前記凸部の端面の周方向に沿って設けられた溝部を備えたこと
    　を特徴とする請求項１記載の排気ガス再循環バルブ。     The exhaust gas recirculation valve according to claim 1, further comprising a groove provided between a central portion and an outer peripheral portion of the convex portion along a circumferential direction of an end surface of the convex portion.
  3. 　前記第２のハウジングは、耐熱材で構成されていること
    　を特徴とする請求項１記載の排気ガス再循環バルブ。     The exhaust gas recirculation valve according to claim 1, wherein the second housing is made of a heat-resistant material.
  4. 　前記第２のハウジングは、鋳鉄材で構成されていること
    　を特徴とする請求項３記載の排気ガス再循環バルブ。     The exhaust gas recirculation valve according to claim 3, wherein the second housing is made of a cast iron material.
  5. 　前記第１のハウジングは、アルミニウム材で構成されていること
    　を特徴とする請求項１記載の排気ガス再循環バルブ。     The exhaust gas recirculation valve according to claim 1, wherein the first housing is made of an aluminum material.
  6. 　前記第２のハウジングは、エンジン側の取り付け部と線膨張係数が同じ材料で構成されていること
    　を特徴とする請求項１記載の排気ガス再循環バルブ。     2. The exhaust gas recirculation valve according to claim 1, wherein the second housing is made of a material having the same linear expansion coefficient as a mounting portion on the engine side. 3.
PCT/JP2018/023835 2018-06-22 2018-06-22 Exhaust gas recirculation valve WO2019244346A1 (en)

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Publication number Priority date Publication date Assignee Title
JPWO2022085157A1 (en) * 2020-10-22 2022-04-28

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JPS5512067U (en) * 1978-07-12 1980-01-25
JPH0650218A (en) * 1991-02-14 1994-02-22 Taiho Kogyo Co Ltd Heat insulating device for exhaust reflux control valve
JPH08105566A (en) * 1994-09-09 1996-04-23 General Motors Corp <Gm> Valve assembly
US20010032950A1 (en) * 2000-02-24 2001-10-25 Bircann Raul A. Optimal sealability base for a gas management valve
WO2016067463A1 (en) * 2014-10-31 2016-05-06 三菱電機株式会社 Fluid control valve
JP2017514052A (en) * 2014-02-26 2017-06-01 ピールブルク ゲゼルシャフト ミット ベシュレンクテル ハフツングＰｉｅｒｂｕｒｇ ＧｍｂＨ Unit for attaching a control valve to a fluid passage casing of an internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512067U (en) * 1978-07-12 1980-01-25
JPH0650218A (en) * 1991-02-14 1994-02-22 Taiho Kogyo Co Ltd Heat insulating device for exhaust reflux control valve
JPH08105566A (en) * 1994-09-09 1996-04-23 General Motors Corp <Gm> Valve assembly
US20010032950A1 (en) * 2000-02-24 2001-10-25 Bircann Raul A. Optimal sealability base for a gas management valve
JP2017514052A (en) * 2014-02-26 2017-06-01 ピールブルク ゲゼルシャフト ミット ベシュレンクテル ハフツングＰｉｅｒｂｕｒｇ ＧｍｂＨ Unit for attaching a control valve to a fluid passage casing of an internal combustion engine
WO2016067463A1 (en) * 2014-10-31 2016-05-06 三菱電機株式会社 Fluid control valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2022085157A1 (en) * 2020-10-22 2022-04-28
WO2022085157A1 (en) * 2020-10-22 2022-04-28 三菱電機株式会社 Exhaust gas recirculation valve
JP7237251B2 (en) 2020-10-22 2023-03-10 三菱電機株式会社 Exhaust gas recirculation valve

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