EP3683434B1 - Soupape de recyclage de gaz d'échappement pour moteur à combustion interne - Google Patents

Soupape de recyclage de gaz d'échappement pour moteur à combustion interne Download PDF

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Publication number
EP3683434B1
EP3683434B1 EP19217952.1A EP19217952A EP3683434B1 EP 3683434 B1 EP3683434 B1 EP 3683434B1 EP 19217952 A EP19217952 A EP 19217952A EP 3683434 B1 EP3683434 B1 EP 3683434B1
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EP
European Patent Office
Prior art keywords
valve
valve rod
exhaust gas
combustion engine
guide
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.)
Active
Application number
EP19217952.1A
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German (de)
English (en)
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EP3683434A1 (fr
Inventor
Norbert Simons
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.)
Pierburg GmbH
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Pierburg GmbH
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Publication of EP3683434A1 publication Critical patent/EP3683434A1/fr
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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
    • F02M26/67—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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/74—Protection from damage, e.g. shielding means

Definitions

  • the invention relates to an exhaust gas recirculation valve for an internal combustion engine, having a housing with an inlet and an outlet, a valve body that can be moved in translation, the movement of which can be used to regulate a flow cross section between the inlet and the outlet, a valve rod that is firmly connected to the valve body, an actuator via which the valve rod with the valve body can be placed on a valve seat or lifted from the valve seat surrounding the controllable flow cross section, a guide bushing which is arranged in the housing and in which the valve rod is mounted and sealing means for sealing a gap between the guide bushing and the valve rod that can be moved in the guide bush.
  • Exhaust gas recirculation valves are used to regulate an exhaust gas flow that is recirculated into the cylinders of the internal combustion engine, which is fed back into the combustion process in the cylinders, and to reduce nitrogen emissions.
  • valves are usually designed as lifting valves, in which a valve body attached to a valve rod can be lifted from a valve seat between an inlet and an outlet or lowered onto it via an actuator, with intermediate positions also being able to be approached exactly for precise control.
  • the free cross-section between the inlet and the outlet is regulated in order to return an optimal flow of exhaust gas.
  • electromotive actuators with downstream gears are used to actuate the valve rod coupled to the valve body.
  • the task is therefore to provide an exhaust gas recirculation valve for an internal combustion engine which, over a long service life, significantly reduces both the penetration of particles and exhaust gases in the direction of the actuator and in the direction of the sliding area between the guide bush and the valve rod, so that Damage in the guide area between the valve rod and the guide bush can be avoided and the necessary actuating forces remain low even after many hours of use.
  • wear and tear should be reduced. Nevertheless, this should be able to be produced as cost-effectively as possible with little production and assembly effort.
  • a sealing ring along which the valve rod is slidably movable, is arranged inside the guide bush in a sealing portion formed axially between the first guide portion and the second guide portion.
  • This sealing ring provides additional protection for the sliding surface between the valve rod and the guide bush, with the ingress of gases in the direction of the actuator being reliably prevented by this sealing ring, thereby reducing the thermal load on the actuator.
  • the sealing ring advantageously lies with its first axial end axially against the second guide section of the guide bush, which prevents sealing directly at the entrance to the gap between the second guide section and the valve rod, since the flow resistance is increased at this position.
  • the guide bushing has a constriction against which the sealing ring rests with its second axial end opposite the first axial end, whereby the axial position of the sealing ring in the guide bushing is fixed without having to use additional components.
  • the sealing ring is inserted into the recess with slight deformation and then the valve rod is inserted into the guide bush.
  • the guide bushing is arranged outside of the second guide section at a distance from the valve rod. In this way, the sliding surface of the guide bush is reduced to the areas in which the piston rings are used for guidance and the area that is arranged beyond the sealing ring. This prevents scoring due to friction between the guide bushing and the valve rod in the area that is pushed into the second guide section, so that damage in the second guide section is significantly reduced.
  • the guide bushing has a uniform internal diameter from its axial end pointing towards the valve body to the constriction.
  • the piston rings preferably have an inclined or stepped slit, which significantly reduces the ingress of contaminants through the slit compared to vertical slits.
  • the at least one piston ring is preferably arranged in a radial groove of the valve rod. This enables easy assembly of the piston ring with a high sealing effect at the same time, both along the valve rod and to the guide bush along which the piston rings slide.
  • exactly two piston rings are arranged at an axial distance from one another on the valve rod. These two piston rings arranged one behind the other significantly increase the sealing effect, as they act like a labyrinth seal.
  • exactly one sealing ring is arranged in the guide bush, since it has been found that this, in conjunction with the piston rings, ensures an adequate and very good seal with respect to the actuator.
  • the sealing ring is advantageously a radial shaft sealing ring, which also ensures a high sealing effect over a long service life for such a lifting valve.
  • An exhaust gas recirculation valve for an internal combustion engine is thus created in which simple and inexpensive means ensure very good sealing of the gap between the valve rod and the guide bush and wear is reduced in comparison to known designs, so that a long service life is achieved. This prevents solid or liquid contaminants from penetrating into the guide area between the valve rod and the guide bush, which would make the valve difficult to move and to increased wear, and prevents hot or contaminated gases from penetrating into the actuator, so that this protected from thermal overload or corrosion.
  • the figure shows a detail of a side view of an exhaust gas recirculation valve according to the invention in a sectional view.
  • the exhaust gas recirculation valve has a housing 10 with an inlet 12 and an outlet 14 for the exhaust gas, to which an actuator housing 16 is attached, in which an actuator 18 is arranged, which consists of an electric motor 20, shown only partially, and one driven by the electric motor 20 , also only partially recognizable Transmission 22 is, via which the movement of the electric motor 20 is transmitted to a valve rod 24 stocky.
  • the transmission 22 can have an eccentric, not shown, which interacts with a link, not shown, whereby the rotational movement of the electric motor 20 is transferred into a translatory movement of the valve rod 24, which is at least operatively connected to the link.
  • the connecting link and the eccentric protrude into a gear chamber 26 which is closed by a cover cap 28 which, like the actuator housing 16, is fastened to the housing 10.
  • a restoring spring 30 radially surrounding the valve rod 24 is also arranged in the gear chamber 26 and is supported on the housing 10 and pretensions the exhaust gas recirculation valve in the closing direction.
  • valve rod 24 is mounted in a guide bushing 32 which is fixed in a bore 34 in the housing 10 .
  • a valve body 36 is fastened to the end of the valve rod 24 opposite the actuator 18 and interacts with a valve seat 38 which is formed in the housing 10 between the inlet 12 and the outlet 14 .
  • the valve body 36 is lifted off the valve seat 38 via the valve rod 24 against the force of the return spring 30 or lowered onto it by the force of the return spring 30, and the free flow cross section between the inlet 12 and the outlet 14 is thus regulated.
  • the valve rod 24 is radially surrounded sealing means 42 are provided.
  • these consist of two piston rings 44 which lie axially one above the other but are arranged at an axial distance from one another, which are made, for example, of coated stainless steel and are each arranged in a circumferential radial groove 46 .
  • Each of these piston rings 44 has an oblique running slot, whereby the slope of the flow resistance and thus the sealing effect is increased.
  • the piston rings 44 run in a first guide section 50 of the guide bushing 32, which points towards the valve body 36 and is at the bottom in the figure, and rest against it on the outside, so that the valve rod 24 is guided in the guide bushing 32 in a sliding manner via the piston rings 44.
  • the two piston rings 44 are first bent open and placed in the radial grooves 46 and then pushed into the guide bushing 32 with the valve rod 24 .
  • a second guide section 52 of the guide bushing 32 is formed at the opposite second end remote from the valve body 36 .
  • the valve rod 24 slides directly on the inner circumference of the guide bushing 32.
  • a sealing section 54 of the guide bushing 32 which is arranged between the first guide section 50 and the second guide section 52 adjoins this second guide section 52 .
  • the guide bushing 32 has an enlarged diameter, in which a sealing ring 56 is arranged, which can be designed in particular as a radial shaft sealing ring.
  • the sealing ring 56 rests with its first axial end 58 against the end of the second guide section 52 and with its second axial end 60 pointing towards the valve body 36 against a constriction 62 of the guide bushing 32, which, however, is also at a distance from the valve rod 24.
  • the sealing ring 56 is installed by pushing it from the end of the guide bushing 32 pointing towards the valve body 36 into the guide bushing 32, which has a constant inner diameter from this axial end to the constriction, and then by pressing it together over the constriction 62 and into the through the Constriction 62 resulting radial groove is inserted, where it unfolds again.
  • valve rod 24 with the piston rings 44 can then simply be inserted into the guide bushing 32, since the guide bushing 32 itself is at a distance from the valve rod 24, except in the second guide section 52 to the valve rod 24, which is from the first guide portion.
  • the construction described has the consequence that a high degree of tightness against the exhaust gas and thus also against the soot and condensate that may be present is achieved and long-lasting ease of movement of the valve rod during the translational movement is ensured.
  • the guidance in the guide bush in the area close to the exhaust gas is established via the piston rings, which are insensitive to dirt and yet always have good sliding properties, and on the other hand, the direct guidance of the valve rod in the guide bush is limited to a short area, which is also protected from dirt by the sealing ring. In this way, sluggishness or even jamming of the exhaust gas recirculation valves is reliably prevented even at high temperatures.

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)
  • Exhaust-Gas Circulating Devices (AREA)
  • Lift Valve (AREA)

Claims (11)

  1. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne, avec
    un boitier (10) avec une entrée (12) et une sortie (14),
    un corps de vanne (36) mobile en translation, dont le mouvement permet le réglage une section d'écoulement entre l'entrée (12) et la sortie (14) peut être réglée,
    une tige de vanne (24) solidaire du corps de vanne (36),
    un actionneur (18) par lequel la tige de vanne (24) avec le corps de vanne (36) peut être placé sur un siège de vanne (38) et ou peut être enlevé dudit siège de vanne (38) qui entoure la section d'écoulement réglable,
    une douille de guidage (32) disposée dans le boitier (10) et dans laquelle est supporté la tige de vanne (24),
    des moyens d'étanchéité (42) pour étanchéifier une fente entre la douille de guidage (32) et la tige de vanne (24) mobile dans la douille de guidage (32),
    caractérisée en ce qu'un ou plusieurs segments de piston (44) son disposés sur la tige de vanne (24) dans une première section de guidage (50) orientée vers le corps de vanne (36) à l'intérieur de la douille de guidage (32) par lesquels la tige de vanne (24) est supportée de manière glissante dans la douille de guidage (32), et, dans une deuxième section de guidage (52) plus loin du corps de vanne (36), la tige de vanne (24) est supporté de manière glissante directement dans la douille de guidage (32).
  2. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon la revendication 1, caractérisée en ce qu'une bague d'étanchéité (50), le long de laquelle la tige de vanne (24) peut être déplacée, est disposée dans la douille de guidage (32) dans une section d'étanchéité (54) formée axialement entre la première section de guidage (50) et la deuxième section de guidage (52).
  3. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon la revendication 2, caractérisée en ce que, par son extrémité axiale (58), la bague d'étanchéité (56) s'appuie axialement contre la deuxième section de guidage (52) de la douille de guidage (32).
  4. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon la revendication 3, caractérisée en ce que la douille de guidage (32) présente un rétrécissement (62) contre laquelle s'appuie la bague d'étanchéité (56) par son deuxième extrémité axiale (60) opposée à la première extrémité (58) axiale.
  5. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon une des revendications 2 à 4, caractérisée en ce que la douille de guidage (32) est disposée à l'extérieur de la deuxième section de guidage (52) à distance de la tige de vanne (24)).
  6. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon une des revendications 4 ou 5, caractérisée en ce que la douille de guidage (32) présente un diamètre intérieur uniforme depuis son extrémité axile tournée vers le corps de vanne (36) jusqu'au rétrécissement (62).
  7. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit au moins un segment de piston (44) présente une fente inclinée ou étagée.
  8. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit au moins un segment de piston (44) est disposé dans une rainure radiale (46) de la tige de vanne (24).
  9. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisée en ce qu'exactement deux segments de piston (44) sint disposés sur la tige de vanne (24) à distance axiale l'un de l'autre.
  10. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisée en ce qu'exactement une bague d'étanchéité (56) est disposée dans al douille de guidage (32).
  11. Vanne de recirculation des gaz d'échappement pour moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisée en ce que la bague d'étanchéité (56) est une bague d'étanchéité d'arbre radiale.
EP19217952.1A 2019-01-16 2019-12-19 Soupape de recyclage de gaz d'échappement pour moteur à combustion interne Active EP3683434B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019101051.9A DE102019101051A1 (de) 2019-01-16 2019-01-16 Abgasrückführventil für eine Verbrennungskraftmaschine

Publications (2)

Publication Number Publication Date
EP3683434A1 EP3683434A1 (fr) 2020-07-22
EP3683434B1 true EP3683434B1 (fr) 2022-01-26

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Application Number Title Priority Date Filing Date
EP19217952.1A Active EP3683434B1 (fr) 2019-01-16 2019-12-19 Soupape de recyclage de gaz d'échappement pour moteur à combustion interne

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EP (1) EP3683434B1 (fr)
DE (1) DE102019101051A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6217001B1 (en) * 1999-06-29 2001-04-17 Delphi Technologies, Inc. Pressure balanced gas valve
US6439213B2 (en) * 2000-02-24 2002-08-27 Delphi Technologies, Inc. Shaft leakage arresting system for a gas management valve
DE102010035622B4 (de) 2010-08-26 2012-04-26 Pierburg Gmbh Abgasrückführventil für eine Verbrennungskraftmaschine
DE102014108997A1 (de) * 2013-06-26 2015-01-15 BorgWarner Esslingen GmbH Hochtemperaturventil für eine Verbrennungskraftmaschine
DE102014201085B4 (de) * 2014-01-22 2018-12-06 Bayerische Motoren Werke Aktiengesellschaft Abgasrückführventil
JP6435969B2 (ja) * 2015-03-31 2018-12-12 株式会社デンソー Ｅｇｒ装置
JP6447461B2 (ja) * 2015-11-04 2019-01-09 株式会社デンソー シールリング

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EP3683434A1 (fr) 2020-07-22
DE102019101051A1 (de) 2020-07-16

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