EP1739301A1 - AGR-Ventil für eine Brennkraftmaschine und Ventilsitz dafür - Google Patents

AGR-Ventil für eine Brennkraftmaschine und Ventilsitz dafür Download PDF

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Publication number
EP1739301A1
EP1739301A1 EP05253995A EP05253995A EP1739301A1 EP 1739301 A1 EP1739301 A1 EP 1739301A1 EP 05253995 A EP05253995 A EP 05253995A EP 05253995 A EP05253995 A EP 05253995A EP 1739301 A1 EP1739301 A1 EP 1739301A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve seat
regions
head
egr
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.)
Withdrawn
Application number
EP05253995A
Other languages
English (en)
French (fr)
Inventor
Gerard Kneppers
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP05253995A priority Critical patent/EP1739301A1/de
Publication of EP1739301A1 publication Critical patent/EP1739301A1/de
Withdrawn legal-status Critical Current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
    • F02M26/68—Closing members; Valve seats; Flow passages
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the present invention relates to an exhaust gas recirculation (EGR) valve for an internal combustion engine, and in particular to a valve seat for an EGR valve to prevent valve sticking.
  • EGR exhaust gas recirculation
  • the exhaust gas of an internal combustion engine contains various amounts of unburnt hydrocarbons, carbon monoxide (CO) and nitrous oxides (NOx). Emission of these materials to the atmosphere is undesirable. The problem is more acute in urban areas having a high concentration of motor vehicles.
  • EGR exhaust gas recirculation
  • NOx nitrous oxide
  • EGR systems typically employ an EGR passage disposed between the engine exhaust manifold and the air intake manifold and operable to recirculate exhaust gas from the exhaust side of the engine back to the intake side.
  • An EGR valve is typically provided to selectively control the recirculation of exhaust gas.
  • a typical known EGR valve is shown in Fig 1.
  • the valve comprises a valve body (not shown) having a valve seat 2 positioned in a passageway between an inlet for communication with an exhaust duct of an internal combustion engine and an outlet for communication with an intake manifold of the internal combustion engine.
  • a valve head 4 is attached to one end of a valve shaft 6, the other end of the valve shaft 6 being connected to an actuating means (not shown) wherein the valve head 4 can be moved between a closed position, wherein the valve head 4 abuts the valve seat 2 to close communication between the inlet and the outlet of the valve body, and an open position, wherein the valve head 4 is spaced from the valve seat 2 to permit the passage of exhaust gases from the inlet to the outlet.
  • valve seat 2 In order to prevent leakage between the valve seat 2 and the valve head 4 when the valve head 4 is in its closed position, the valve seat 2 defines a conical contact surface having a taper angle corresponding to a cooperating conical contact surface of the valve head 4. This arrangement ensures optimum alignment between the valve head 4 and valve seat 2 when the valve head 4 is in its closed position by providing a degree of self centring of the valve head 4 on the valve seat 2.
  • valve head 4 has been found to result in sticking problems wherein the valve head 4 becomes "wedged” or “corked” within the valve seat 2, particularly when deposits occur on the contact surfaces of the valve seat 2 and valve head 4.
  • this sticking problem it is desirable to reduce the contact area between the valve head and valve seat.
  • this reduces the self alignment properties of the valve and can lead to leakages between the valve seat and valve head when the valve head is in its closed position.
  • an annular valve seat for an EGR valve having a tapered or conical valve head having a cooperating tapered or conical contact face, said contact face having a plurality of radially spaced regions having a width in a substantially axial direction greater than the width of regions of the valve seat therebetween, such that the contact area between the valve seat and valve head in said spaced regions is greater than the contact area between the valve seat and the valve head in the regions between said spaced regions.
  • the radial extent of said spaced regions is less than the radial extent of the regions therebetween.
  • the spaced regions of greater contact area ensure good centring of the valve to ensure correct seating of the valve head in the valve seat while the overall contact area between the valve head and valve seat is minimised to reduce the risk of sticking.
  • a valve for an EGR passage of an internal combustion engine comprising a valve body having a valve seat according to the first aspect of the invention positioned in a passageway between an inlet for communication with an exhaust duct of an internal combustion engine and an outlet for communication with an intake manifold of the internal combustion engine, a valve head attached to one end of a valve shaft, the other end of the valve shaft being connected to an actuating means wherein the valve head can be moved between a closed position, wherein the valve head abuts the valve seat to close communication between the inlet and the outlet of the valve body, and an open position, wherein the valve head is spaced from the valve seat to permit the passage of exhaust gases from the inlet to the outlet.
  • a method of manufacturing a valve seat for an EGR valve comprising the steps of providing an annular valve seat having a tapered or conical contact face for cooperating with a conical contact face of a valve head of the EGR valve, machining a plurality of equal spaced regions of the inner face of the valve seat to a diameter greater than that of the remainder of the inner face of the valve seat to reduce the width of the contact face of the valve seat in said regions.
  • the radial extent of said machined regions is greater than the radial extent of said remainder of the inner face of the valve seat.
  • three equal spaced regions are machined to a diameter less than that of the remainder of the inner face of the valve seat.
  • the EGR valve comprises a valve body (not shown) having a valve seat 2 positioned in a passageway between an inlet for communication with an exhaust duct of an internal combustion engine and an outlet for communication with an intake manifold of the internal combustion engine.
  • a valve head 4 is attached to one end of a valve shaft 6, the other end of the valve shaft 6 being connected to an actuating means (not shown) wherein the valve head 4 can be moved between a closed position (as shown in Fig 3), wherein the valve head 4 abuts the valve seat 2 to close communication between the inlet and the outlet of the valve body, and an open position, wherein the valve head 4 is spaced from the valve seat 2 to permit the passage of exhaust gases from the inlet to the outlet.
  • the valve seat 2 comprises an annular ring having a conical contact face 8.
  • three equal spaced regions 10 of the inner face of the valve seat 2 are cut away to a diameter greater than that of the remainder of the valve seat to reduce the width of the contact face in said regions.
  • three equal spaced regions 12 of the valve seat having a greater contact area remain between the three cut away regions whereby such regions of greater contact area guide the valve head 4 to centralise the valve head 4 in the valve seat 2, ensuring reliable sealing of the valve while minimising the likelihood of the valve sticking in its closed position.
  • valve seat for a valve for closing an exhaust gas recirculation passage of an internal combustion engine
  • valve seat according to the invention may also be applicable in other applications, such as inlet and outlet valves of an internal combustion engine or poppet valves in other applications wherein sticking of the valve head in the valve seat might be a problem.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP05253995A 2005-06-28 2005-06-28 AGR-Ventil für eine Brennkraftmaschine und Ventilsitz dafür Withdrawn EP1739301A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05253995A EP1739301A1 (de) 2005-06-28 2005-06-28 AGR-Ventil für eine Brennkraftmaschine und Ventilsitz dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05253995A EP1739301A1 (de) 2005-06-28 2005-06-28 AGR-Ventil für eine Brennkraftmaschine und Ventilsitz dafür

Publications (1)

Publication Number Publication Date
EP1739301A1 true EP1739301A1 (de) 2007-01-03

Family

ID=35124680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05253995A Withdrawn EP1739301A1 (de) 2005-06-28 2005-06-28 AGR-Ventil für eine Brennkraftmaschine und Ventilsitz dafür

Country Status (1)

Country Link
EP (1) EP1739301A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109348724A (zh) * 2016-06-07 2019-02-15 博格华纳公司 用于涡轮壳体中的旁路的插入件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349003A (en) * 1979-06-29 1982-09-14 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation control valve
DE4009923A1 (de) * 1990-03-28 1991-10-02 Fev Motorentech Gmbh & Co Kg Ventil zum dosieren des abgasrueckfuehrstromes bei brennkraftmaschinen
DE10048499A1 (de) * 2000-10-07 2002-04-11 Pierburg Ag Abgasrückführeinrichtung
US6631707B1 (en) * 1999-05-05 2003-10-14 Daimlerchrysler Ag Device for recirculating the exhaust gas of an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349003A (en) * 1979-06-29 1982-09-14 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation control valve
DE4009923A1 (de) * 1990-03-28 1991-10-02 Fev Motorentech Gmbh & Co Kg Ventil zum dosieren des abgasrueckfuehrstromes bei brennkraftmaschinen
US6631707B1 (en) * 1999-05-05 2003-10-14 Daimlerchrysler Ag Device for recirculating the exhaust gas of an internal combustion engine
DE10048499A1 (de) * 2000-10-07 2002-04-11 Pierburg Ag Abgasrückführeinrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109348724A (zh) * 2016-06-07 2019-02-15 博格华纳公司 用于涡轮壳体中的旁路的插入件

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