WO2019244346A1 - Soupape de recirculation de gaz d'échappement - Google Patents

Soupape de recirculation de gaz d'échappement 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
Authority
WO
WIPO (PCT)
Prior art keywords
housing
exhaust gas
gas recirculation
recirculation valve
lower housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/023835
Other languages
English (en)
Japanese (ja)
Inventor
孝治 弓達
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2018/023835 priority Critical patent/WO2019244346A1/fr
Publication of WO2019244346A1 publication Critical patent/WO2019244346A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

La présente invention concerne une soupape EGR (1) qui est configurée de telle sorte qu'un logement supérieur (3) et un logement inférieur (4), dans lesquels une saillie (3a) est emmanchée à force dans un évidement (4a), soient tous deux fixés au niveau de sections à bride (3c, 3d, 4b, 4c) à une poche côté moteur (100) par des boulons.
PCT/JP2018/023835 2018-06-22 2018-06-22 Soupape de recirculation de gaz d'échappement Ceased WO2019244346A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/023835 WO2019244346A1 (fr) 2018-06-22 2018-06-22 Soupape de recirculation de gaz d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/023835 WO2019244346A1 (fr) 2018-06-22 2018-06-22 Soupape de recirculation de gaz d'échappement

Publications (1)

Publication Number Publication Date
WO2019244346A1 true WO2019244346A1 (fr) 2019-12-26

Family

ID=68983318

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/023835 Ceased WO2019244346A1 (fr) 2018-06-22 2018-06-22 Soupape de recirculation de gaz d'échappement

Country Status (1)

Country Link
WO (1) WO2019244346A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022085157A1 (fr) * 2020-10-22 2022-04-28 三菱電機株式会社 Soupape de recirculation de gaz d'échappement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512067U (fr) * 1978-07-12 1980-01-25
JPH0650218A (ja) * 1991-02-14 1994-02-22 Taiho Kogyo Co Ltd 排気還流量制御弁の断熱装置
JPH08105566A (ja) * 1994-09-09 1996-04-23 General Motors Corp <Gm> 弁組立体
US20010032950A1 (en) * 2000-02-24 2001-10-25 Bircann Raul A. Optimal sealability base for a gas management valve
WO2016067463A1 (fr) * 2014-10-31 2016-05-06 三菱電機株式会社 Vanne de régulation de fluide
JP2017514052A (ja) * 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 内燃機関の流体通路ケーシングに制御弁を取り付けるためのユニット

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512067U (fr) * 1978-07-12 1980-01-25
JPH0650218A (ja) * 1991-02-14 1994-02-22 Taiho Kogyo Co Ltd 排気還流量制御弁の断熱装置
JPH08105566A (ja) * 1994-09-09 1996-04-23 General Motors Corp <Gm> 弁組立体
US20010032950A1 (en) * 2000-02-24 2001-10-25 Bircann Raul A. Optimal sealability base for a gas management valve
JP2017514052A (ja) * 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 内燃機関の流体通路ケーシングに制御弁を取り付けるためのユニット
WO2016067463A1 (fr) * 2014-10-31 2016-05-06 三菱電機株式会社 Vanne de régulation de fluide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022085157A1 (fr) * 2020-10-22 2022-04-28 三菱電機株式会社 Soupape de recirculation de gaz d'échappement
JPWO2022085157A1 (fr) * 2020-10-22 2022-04-28
JP7237251B2 (ja) 2020-10-22 2023-03-10 三菱電機株式会社 排気ガス再循環バルブ

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