EP3095997A1 - Soupape de regulation de gaz chaud - Google Patents

Soupape de regulation de gaz chaud Download PDF

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Publication number
EP3095997A1
EP3095997A1 EP16165779.6A EP16165779A EP3095997A1 EP 3095997 A1 EP3095997 A1 EP 3095997A1 EP 16165779 A EP16165779 A EP 16165779A EP 3095997 A1 EP3095997 A1 EP 3095997A1
Authority
EP
European Patent Office
Prior art keywords
valve
hot gas
control valve
gas control
valve rod
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.)
Granted
Application number
EP16165779.6A
Other languages
German (de)
English (en)
Other versions
EP3095997B1 (fr
Inventor
Peter Foessl
Bernhard Ramsebner
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3095997A1 publication Critical patent/EP3095997A1/fr
Application granted granted Critical
Publication of EP3095997B1 publication Critical patent/EP3095997B1/fr
Active 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
    • F02M26/74—Protection from damage, e.g. shielding means
    • 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
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors
    • 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
    • F02M26/73—Housings with means for heating or cooling the EGR valve

Definitions

  • the invention relates to a hot gas control valve, in particular an exhaust gas control valve of a vehicle.
  • Such a hot gas control valve is e.g. used as an exhaust gas recirculation valve in an exhaust gas recirculation system of an internal combustion engine.
  • environmentally harmful nitrogen oxides are formed at high combustion temperatures, the formation of which can be reduced by branching off a portion of the exhaust gas from the exhaust pipe via an exhaust gas recirculation valve and admixing the fresh air supplied to the engine so as to lower the oxygen concentration in the charge air. This results in a combustion process at lower temperatures, resulting in less nitrogen oxides. An even higher efficiency in nitrogen oxide reduction is obtained when the recirculated exhaust gas is cooled.
  • Exhaust gas recirculation is a crucial measure for reducing nitrogen oxide emissions, especially in diesel engines, since the use of exhaust aftertreatment systems alone is not sufficient to comply with environmental legislation.
  • Exhaust gas recirculation valves are usually mounted close to the exhaust manifold and consequently are operated in the hot exhaust gas flow at temperatures of up to 850 ° C.
  • contaminations in the exhaust gas such as soot particles, engine oil residues or diesel components place increased demands on the valve for consistent performance over the entire vehicle life, as these combustion residues are deposited over time on the gas-carrying components of the valve.
  • a hot gas control valve in particular exhaust control valve is provided with a housing and a valve rod arranged on a shut-off body, wherein the valve rod is mounted on the housing side and performs a rotational movement upon actuation of the shut-off and wherein in the region of the housing at least one of the valve rod facing, near the Surface of the valve rod endende scraping edge is present for scraping itself on the in the extended state of the valve rod exposed to the hot gas portion of the valve rod deposits.
  • a bearing of the valve stem e.g. may be formed by a passage in the housing, is protected from excessive condensate and solids entry. This ensures the consistent function of the valve over the entire vehicle life.
  • At least one housing-side valve bearing is provided, which is designed in particular as a plain bearing bush. This is e.g. inserted into a bore in the valve body.
  • a low-friction material pairing is used for valve-bearing and valve rod, such as a bronze alloy for the valve bearing in combination with a steel valve stem.
  • a production-technically simple solution results from the fact that preferably the at least one scraping edge is arranged at the end of the valve bearing facing the shut-off body.
  • the scraping edge can also be provided directly on the housing or placed on the housing in a region facing the shut-off body.
  • the at least one scraping edge is arranged in the region of a recess in the valve bearing.
  • the recess can then absorb the scraped off substances.
  • the at least one scraping edge is formed by an edge of the recess, d. H. the scraping edge is not opposite to an inner wall of the valve bearing.
  • a structurally simple embodiment results when the recess is milled into the valve bearing.
  • a Stirnwalzen- or end mill or a disc or sickle cutters can be used.
  • the valve bearing has a bushing section facing the shut-off body, which has at least one radially continuous slot whose radially inner-side edge forms the scraping edge.
  • the slot which can be seen in the radial direction as an angular U, T or as V, additionally forms a recess in the valve bearing, which can absorb the scraped substances.
  • valve bearing is surrounded by the shut-off body radially from a housing-side heat shield.
  • a housing-side heat shield This is preferably made of stainless steel and also serves as a coarse dirt cap.
  • the heat shield may be an integrally formed extension of the housing.
  • a drive unit is provided with an output shaft, wherein the valve rod forms a direct extension of the output shaft. In this way, a particularly compact design is achieved.
  • valve rod may have a threaded spindle, which at least partially converts a rotational movement of the valve rod into a linear movement of the shut-off body.
  • a valve is for example as High pressure exhaust gas recirculation valve, VNT (Variable Nozzle Turbocharger) actuator or diverter valve application.
  • the hot gas control valve may also be designed such that the shut-off body is rotationally actuated, for example in the case of a swirl flap, throttle flap or a low-pressure exhaust gas recirculation valve.
  • valve bearing on a portion in which a valve rod facing cylindrical recess is provided, which is designed in particular as a relief.
  • This recess serves to increase the bearing gap between the valve bearing and the valve rod, which in a structurally simple way, a friction increase due to not entirely avoidable deposits in the storage area of the valve stem is minimized.
  • FIG. 1 shows a hot gas control valve 10 according to the invention, which is in particular an exhaust gas control valve for an exhaust gas recirculation system of a vehicle internal combustion engine
  • the hot gas control valve 10 has a two-part housing 12 and a housing side mounted valve rod 14, on which a shut-off 16 is arranged, which is designed here as a valve plate and, as in FIG. 1 indicated, at least between a closed position and an open position can be moved back and forth.
  • valve rod 14 has a threaded spindle 18 and is mounted in a housing-side valve bearing 20, which is designed as a plain bearing bush and arranged in a bore 22 of the housing 12.
  • the valve rod 14 forms a direct extension of an output shaft of a drive unit 24 in the form of an electric drive (see FIG. 1 ) which, when actuated, causes the valve rod 14 to rotate.
  • a drive unit 24 in the form of an electric drive (see FIG. 1 ) which, when actuated, causes the valve rod 14 to rotate.
  • this rotational movement of the valve rod 14 is at least partially converted into a linear movement of the shut-16.
  • a recess 28 in the form of a radially continuous slot is provided in a sleeve portion 26 of the valve bearing 20 facing the shut-off body 16, wherein the radially inner edges or edges of the slot or recess 28 each form a scraping edge 30 (FIG. FIG. 2 ).
  • the scraping edges 30 terminate near the surface of the valve rod 14 and are used for scraping deposits that settle in the extended state of the valve rod 14 on the hot gas exposed portion of the valve stem 14.
  • the scraping edges 30 are thus arranged on the shut-off body 16 facing the end of the valve bearing 20.
  • the recess 28 is milled into the valve bearing 20, for example with a Stirnwalzen- or end mill, and has the shape of a polygonal U.
  • the scraping edges 30 thus extend parallel to the longitudinal axis Of course, the perpendicular to the longitudinal axis L extending edge of the slot, which forms the lower part of the polygonal U, a scraping edge 30 represent.
  • the recess 28 could also be provided only on the inside of the valve bearing 20 facing the valve rod 14, that is to say not radially configured continuously.
  • the embodiment shown with the radially continuous slot is to realize production technology easier.
  • a heat shield 32 is provided, which is designed as a cap, for example, made of stainless steel and the valve bearing 20 to the shut-off body 16 radially surrounds.
  • the heat shield 32 also serves as a coarse dirt cap, which reduces an entry of impurities from the exhaust gas into the valve bearing 20.
  • valve bearing 20 has, on the side facing away from the shut-off body 16, a section 34 in which an in FIG. 2 only indicated, the valve rod 14 facing cylindrical recess 36 is provided. This is executed in particular as an undercut.
  • the internal recess 36 the bearing gap between the valve bearing 20 and the valve rod 14 is increased, whereby a friction increase due to unavoidable deposits is minimized.
  • FIG. 3 shows an alternative embodiment of the hot gas control valve 10, which differs from the previously described only in that the recess 28 and the radially continuous slot is designed in the form of a V, whereby the scraping edges 30 are arranged obliquely to the longitudinal axis L of the valve rod 14.
  • a slot can be milled, for example, with a disc or sickle cutters in the valve bearing 20, more precisely, the socket portion 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lift Valve (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP16165779.6A 2015-05-22 2016-04-18 Soupape de regulation de gaz chaud Active EP3095997B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015209512.6A DE102015209512A1 (de) 2015-05-22 2015-05-22 Heißgasregelventil

Publications (2)

Publication Number Publication Date
EP3095997A1 true EP3095997A1 (fr) 2016-11-23
EP3095997B1 EP3095997B1 (fr) 2019-01-02

Family

ID=55806172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16165779.6A Active EP3095997B1 (fr) 2015-05-22 2016-04-18 Soupape de regulation de gaz chaud

Country Status (2)

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EP (1) EP3095997B1 (fr)
DE (1) DE102015209512A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018213344A1 (de) * 2018-08-08 2020-02-13 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Regelung eines Heißgasregelventils, insbesondere eines Abgasregelventils, eines Fahrzeugs

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001271714A (ja) * 2000-03-23 2001-10-05 Aisan Ind Co Ltd 排気ガス再循環制御バルブ
DE10108043A1 (de) * 2001-02-20 2002-08-29 Bosch Gmbh Robert Selbstreinigende Ventile in Zuluft- oder Abgassystem an Verbrennungskraftmaschinen
US20020185624A1 (en) * 2001-06-06 2002-12-12 Bircann Raul Armando Coking-resistant bearing
DE102010035622A1 (de) * 2010-08-26 2012-03-01 Pierburg Gmbh Abgasrückführventil für eine Verbrennungskraftmaschine
DE102013101785A1 (de) * 2013-02-22 2014-08-28 Pierburg Gmbh Abgasventilvorrichtung für eine Verbrennungskraftmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5460146A (en) * 1994-01-12 1995-10-24 Robertshaw Controls Company Solenoid activated exhaust gas recirculation valve
DE19646851A1 (de) * 1996-08-09 1998-02-12 Schaeffler Waelzlager Kg Ventilanordnung einer Brennkraftmaschine
US6299130B1 (en) * 1999-10-14 2001-10-09 Siemens Canada Limited EEGR valve with flexible bearing
US6453934B1 (en) * 2001-02-07 2002-09-24 Delphi Technologies, Inc. Shaft brush for preventing coking in a gas management valve
JP2004100484A (ja) * 2002-09-05 2004-04-02 Keihin Corp 排気ガス再循環バルブ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001271714A (ja) * 2000-03-23 2001-10-05 Aisan Ind Co Ltd 排気ガス再循環制御バルブ
DE10108043A1 (de) * 2001-02-20 2002-08-29 Bosch Gmbh Robert Selbstreinigende Ventile in Zuluft- oder Abgassystem an Verbrennungskraftmaschinen
US20020185624A1 (en) * 2001-06-06 2002-12-12 Bircann Raul Armando Coking-resistant bearing
DE102010035622A1 (de) * 2010-08-26 2012-03-01 Pierburg Gmbh Abgasrückführventil für eine Verbrennungskraftmaschine
DE102013101785A1 (de) * 2013-02-22 2014-08-28 Pierburg Gmbh Abgasventilvorrichtung für eine Verbrennungskraftmaschine

Also Published As

Publication number Publication date
EP3095997B1 (fr) 2019-01-02
DE102015209512A1 (de) 2016-11-24

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