WO2019206687A1 - Soupape d'échappement pour un moteur à combustion interne - Google Patents

Soupape d'échappement pour un moteur à combustion interne Download PDF

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Publication number
WO2019206687A1
WO2019206687A1 PCT/EP2019/059512 EP2019059512W WO2019206687A1 WO 2019206687 A1 WO2019206687 A1 WO 2019206687A1 EP 2019059512 W EP2019059512 W EP 2019059512W WO 2019206687 A1 WO2019206687 A1 WO 2019206687A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing
sealing ring
closing body
valve
exhaust valve
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/EP2019/059512
Other languages
German (de)
English (en)
Inventor
Norbert Simons
Axel Hemsing
Dr. Holger Paffrath
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
Original Assignee
Pierburg GmbH
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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of WO2019206687A1 publication Critical patent/WO2019206687A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the invention relates to an exhaust valve for an internal combustion engine having a housing with an exhaust inlet and an exhaust outlet, a valve closing body, a valve rod to which the valve closing body is attached and which is movable by means of an actuator, a valve seat on which the valve closing body is lowered and of the the valve closing body can be lifted by opposite movement, a bush which is embedded in the housing and radially surrounds the valve rod and a first sealing ring.
  • Such exhaust valves are used in particular as exhaust gas recirculation valves for controlling an exhaust gas flow recirculated into the cylinders of the internal combustion engine, which is again supplied in the cylinders for reducing the nitrogen emissions of the combustion.
  • valves are usually designed as lifting valves, in which a valve-closing body fastened to a valve rod can be lifted off or lowered onto a valve seat between an inlet and an outlet.
  • a valve-closing body fastened to a valve rod can be lifted off or lowered onto a valve seat between an inlet and an outlet.
  • the free cross section between the inlet and the outlet is regulated in order to return an optimal exhaust gas flow.
  • electromotive actuators are usually used with downstream gears for actuating the valve stem.
  • WO 2012/025351 A1 proposes an exhaust gas recirculation valve in which a sealing ring is arranged on the side of the guide bush facing away from the valve closing body, via which the penetration of a gas flow or of particles into an actuator space is to be avoided.
  • the sealing ring is arranged axially adjacent to the direction away from the valve closing body axial end of the sleeve and is located on this axially, so that additional axial space is necessary for the sealing ring.
  • the sealing ring is mounted separately, whereby an additional assembly step is necessary.
  • first sealing ring is fastened in the end of the bush facing away from the valve closing body and rests radially on the valve rod and the bush and thus can optionally take over part of the valve rod guide, no additional axial space is necessary for the sealing ring.
  • This allows an exhaust valve with a low axial height.
  • Further sealing ring and socket can be pre-assembled as an assembly, whereby a particularly simple final assembly of the exhaust valve is made possible.
  • the sealing ring is axially supported on the side facing the valve closing body by a radial shoulder of the bushing.
  • the sealing ring can be fastened on the side facing away from the valve closing body via a crimped or welded connection to the bushing.
  • the sealing ring can be axially supported by the housing on the side facing away from the valve closing body.
  • the sealing ring comprises a support ring and a lip seal, wherein the lip seal is attached to the support ring.
  • the support ring has a substantially U-shaped cross-section and the lip seal ring has a substantially V-shaped cross-section, the first radial support ring leg axially supporting the V-tip of the lip seal, the axial support ring leg the radially outer lip seal Radial support and the second radial support ring leg axially supports the radially outer lip seal leg at the free end.
  • the radially inner lip seal ring leg rests with the free end radially on the valve rod.
  • the support ring is typically made of a relatively rigid material and the lip seal of a relatively flexible material. The sealing ring can thus be reliably mounted on the rigid support ring in the socket and allows the flexible lip seal a reliable seal of the valve stem.
  • the valve rod is guided radially over the support ring.
  • the rigid support ring of the sealing ring allows reliable radial guidance of the valve rod in the socket, for which no additional mounting means or assembly steps are necessary.
  • a second sealing ring is arranged within the bush, which is positioned axially spaced from the first sealing ring on the valve closing body facing side of the first sealing ring.
  • the second sealing ring is preferably constructed comparable to the first sealing ring.
  • the second sealing ring allows a particularly reliable sealing of the valve rod, for which no additional axial space is necessary.
  • the second sealing ring, as well as the first sealing ring be pre-assembled in the socket, so that no additional assembly step in the final assembly of the exhaust valve is necessary.
  • a radial bushing vent hole is provided in the sleeve axially between the first sealing ring and the second sealing ring, which is fluidly connected via a corresponding housing vent hole with the environment, especially with surrounding engine components.
  • either exhaust gas, which passes on the valve closing body facing second sealing ring can be discharged through the vent holes in the environment and thus led away from the actuator chamber in this way, or can via the vent holes a sealing gas flow from the environment into the gap be built between the two sealing rings. Consequently, penetration of exhaust gas into the actuator space can be reliably prevented.
  • a circumferential vent groove is formed between the sleeve and the housing, which fluidly connects the bushing vent hole with the housing vent hole.
  • the circumferential groove provides a simple and reliable fluidic connection between the bushing vent hole and the housing vent hole, for which no rotational alignment of the bush with respect to the housing is necessary.
  • the valve rod on a spring support which is arranged axially between the valve closing body facing the end of the sleeve and the first sealing ring, and is disposed within the sleeve, a spring which is axially supported by the spring support and the exhaust valve in Tense closing direction. Consequently, in the case of a failed actuator ensures that the valve is closed. Flier notebook can be prevented, for example, that in case of failure of the actuator uncontrolled exhaust gas is fed back into the cylinder of the engine
  • the bushing on the radial inner side has a recess which defines a radial bushing shoulder which axially supports the spring. This allows a reliable and compact storage of the spring in the socket and thus a particularly compact exhaust valve.
  • a shielding device is arranged on the valve closing body facing the end of the bush, which shields the valve rod against the exhaust gas.
  • a shielding device is arranged on the valve closing body facing the end of the bush, which shields the valve rod against the exhaust gas.
  • the shielding device rests against the valve rod with the radially inner side, so that deposits which are present on the valve rod can be scraped off during an axial movement of the valve rod by the shielding device before they pass into a guide section of the bushing.
  • the shielding device is formed integrally with the bushing. This allows a reliable attachment of the shielding device to the socket, for which no additional mounting means or assembly steps are necessary.
  • the bushing has a radially inwardly directed bushing leg on the end facing the valve closing body, a shielding device mounting ring is arranged in the bushing, which rests against the bushing on the radial inside on the valve rod and on the radially outer side, and is the Shielding device supported axially by the bushing leg and the shielding device mounting ring.
  • the mounting ring allows for easy and reliable attachment of the shielding to the socket
  • the shield attachment ring is formed by the support ring of a sealing ring, so that no additional mounting means or assembly steps are necessary for the attachment of the shielding device to the socket.
  • a circumferential mounting recess is formed between the radial outer side of the bush and the radial inner side of a receiving bore.
  • the bushing is generally pressed into a receiving bore of the housing.
  • the joining surface between the bushing and the receiving bore is reduced by the circumferential mounting recess, whereby a simple mounting of the socket in the housing is made possible.
  • the mounting recess may be formed by a circumferential recess on the radial outer side of the socket and / or by a circumferential recess on the radial inner side of the receiving bore.
  • the axial extent of the circumferential recess corresponds to at least half the axial extent of the socket, whereby a particularly simple assembly is made possible.
  • the bush is at least in the region of its two axial ends on the radial outer side of the housing to reliably secure the socket in the housing and in particular to prevent tilting of the socket.
  • Figure 1 shows a side view of a section of a first embodiment of an exhaust valve according to the invention in a sectional view
  • Figure 2 to Figure 6 each show a schematic side view of a section of a guide assembly of an alternative embodiment of an exhaust valve according to the invention in a sectional view.
  • the exhaust valve according to the invention has a housing 10 which comprises a flow housing 12 with an exhaust gas inlet 14 and an exhaust gas outlet 16 and an actuator housing 18.
  • an actuator 19 is formed, which consists in the present embodiment of an electric motor not shown in detail and driven by the electric motor not shown in detail.
  • the valve rod 20 is mounted in a guide assembly 22 which is fixed in a receiving bore 24 of the flow housing 12.
  • a valve closing body 26 is fixed, which cooperates with a valve seat 28 which is formed between the exhaust gas inlet 14 and the exhaust gas outlet 16.
  • the guide assembly 22 includes a sleeve 30 radially surrounding the valve rod 20, via which the guide assembly 22 is mounted in the receiving bore 24.
  • the bushing 30 is pressed into the receiving bore 24, wherein between the radial outer side of the bushing 30 and the radial inner side of the receiving bore 24, a circumferential mounting recess 25 is formed to facilitate the pressing of the guide assembly 22 into the receiving bore 24.
  • the bush 30 rests against the radial inner side of the receiving bore 24 at least in the region of its axial ends 41, 59 with the radial outer side.
  • an integral shielding device 32 is formed at the valve closing body 26 facing the end of the socket 30, an integral shielding device 32 is formed.
  • the shielding device 32 has a smaller diameter than the bushing 30 and rests with a guide portion 34 radially on the valve rod 20 at.
  • the shielding device 32 is connected via a radially outwardly directed collar 33 with a radially inwardly directed bushing leg 35 of the bush 30.
  • three sealing rings 36 surrounding the valve rod 20 are arranged radially, each having a support ring 38 and a lip seal ring 40 with a substantially V-shaped cross-section.
  • the first sealing ring 36a is fastened via its supporting ring 38a in the end 41 of the bushing 30 facing away from the valve closing body 26.
  • the support ring 38a bears radially on the inner wall of the bush 30 and on the valve rod 20 and axially against a first radial bushing shoulder 42 and the flow housing 12.
  • the lip sealing ring 40 a of the first sealing ring 36 a is fixed with the V-tip of the valve closing body 26 leading the way to the support ring 38 a and abuts on the radially inner side of the valve rod 20.
  • the second sealing ring 36b is arranged axially adjacent to the first sealing ring 36a on its side facing the valve closing body 26.
  • the second sealing ring 36b is fastened in the bushing 30 via its supporting ring 38b.
  • the support ring 38b abuts radially on the inner wall of the bush 30 and on the valve rod 20 and axially on a second radial bushing shoulder 44 and the support ring 38a of the first sealing ring 36a.
  • the lip sealing ring 40b of the second sealing ring 36b is fastened with the V-tip of the valve closing body 26 leading the way to the support ring 38b and rests against the valve rod 20 on the radially inner side.
  • the first sealing ring 36a, the second sealing ring 36b and the valve rod 20 delimit a venting space 46 which is fluidly connected to the atmosphere via a sealing ring vent 48, a bushing vent bore 50 and a housing venting bore 52. Consequently, exhaust gas that passes along the valve rod 20 into the venting chamber 46, be discharged into the environment before it enters the actuator housing 18 with the actuator 19.
  • a circumferential first vent groove 54 is formed, which fluidly connects the sealing ring vent 48 with the bushing vent hole 50.
  • a circumferential second vent groove 56 is formed, which connects the bushing vent bore 50 fluidly with the housing vent hole 52.
  • the third sealing ring 36 c is disposed at the junction between the sleeve 30 and the shielding device 32.
  • the support ring 38c of the third sealing ring 36c bears radially on the inside of the bushing leg 35 and on the valve rod 20 and axially on the collar 33 of the shielding device 32 as well as an insert washer 58.
  • the lip seal 40c of the third seal ring 36c is connected to the V-tip of FIG Valve-closure member 26 pioneered to the support ring 38 b fixed and is located on the radially inner side of the valve rod 20 at.
  • valve rod 20 radially surrounding spring support 60 On the valve rod between the first sealing ring 36a and the valve closing body 26 facing the end 59 of the bush 30, in the present embodiment between the second sealing ring 36b and the third sealing ring 36c, a valve rod 20 radially surrounding spring support 60 is attached.
  • a valve spring 20 radially surrounding return spring 62 is arranged, which rests axially on the washer 58 and on the spring support 60.
  • the return spring 62 biases the valve rod 20 axially such that the valve closing body 26 is lowered onto the valve seat 28. The exhaust valve is thus biased in the closing direction.
  • Figure 2 to Figure 6 alternative embodiments of the guide assembly are shown, wherein the same reference numerals are used for the same components.
  • the guide assembly 22 shown in FIG. 2 differs from the first exemplary embodiment essentially in that a separate shielding device 32 is fastened to the end of the bushing 30 facing the valve-closing body 26.
  • the shielding device 32 is axially supported by the bushing leg 35 and a Ablevoriquess- mounting ring 72 and abuts on the radially inner side of the valve rod 20 at.
  • the third seal ring 36c specifically the support ring 38c of the third seal ring 36c, forms the shield attachment ring 72.
  • the support ring 36a of the first seal ring 36a is connected to the bush via a seal ring connection 64, for example, a crimped connection or a welded joint 30 fixed and the return spring 62 is located with the valve closing body 26 side facing axially on the support ring 38c of the third sealing ring 36c.
  • the mounting recess 25 has an axial extension Hl, which corresponds to at least half the axial extent H2 of the socket 30, to allow a particularly simple installation.
  • the bushing 30 additionally has a circumferential inner recess 66 on the radially inner side.
  • the inner recess 66 is arranged axially between the second sealing ring 36b and the third sealing ring 36c and defines on the valve closing body 26 side facing a radial spring support shoulder 68, on which the return spring 62 axially abuts the valve closing body 26 side facing.
  • the guide assembly 22 shown in Figure 4 has no return spring and comprises only two sealing rings 36, the first sealing ring 36a and the second sealing ring 36b. At the valve closing body 26 facing the end of the guide group 22 no sealing ring is arranged. To guide the valve rod 20, the bushing 30 at the valve closing body 26 facing the end of a radially inwardly directed guide leg 70.
  • FIG. 5 shows a particularly simple embodiment of the guide assembly 22, which has only a single sealing ring 36, namely the first sealing ring 36a fastened in the end of the bushing 30 facing away from the valve closing body 26.
  • this embodiment of the exhaust valve according to the invention in the guide assembly 22 and the housing 10 no vent holes are provided.
  • the guide assembly 22 shown in Figure 6 differs from the embodiment shown in Figure 5 only in that on the valve closing body 26 facing the end of the socket 30, analogous to the embodiments of Figure 2 and Figure 3, a shielding device 32 is mounted on the Radial inside of the valve rod 20th is applied.
  • the shielding device 32 is supported axially by the bushing leg 35 and by a shielding device mounting ring 72 mounted in the bush 30.
  • the shield attaching ring 72 abuts the valve rod 20 on the radially inner side and is fixed to the bushing 30 on the radially outer side.
  • the exhaust valve according to the invention requires only a small axial height, since the sealing rings are arranged in the socket.
  • the exhaust valve according to the invention also allows an arrangement of the return spring in the socket, whereby the axial height of the exhaust valve can be significantly reduced again.
  • the guide assembly may have a plurality of sealing rings and ventilation bores, whereby penetration of exhaust gas into the actuator housing with the actuator is reliably prevented.
  • the guide assembly of the exhaust valve according to the invention can be pre-assembled, whereby the final assembly of the exhaust valve is simplified accordingly.
  • the final assembly can be additionally simplified by a recess on the radial outer side of the bush or on the radial inner side of the receiving bore.
  • the housing partitions can be changed or the attachment of the guide assembly can be realized in other ways.
  • the sealing rings may be constructed differently and may be attached to the socket in a different manner.
  • the sealing rings can also be constructed differently from each other.
  • the second sealing ring and the third sealing ring and the vent hole may be positioned differently in the socket.
  • the valve rod can be guided in the guide assembly both on the inside of the sealing rings and on the inside of the socket.
  • additional guide sections can be provided on the socket.
  • the valve closing body is arranged on the side facing the actuator of the valve seat, whereby the axial closing direction of the valve reverses.
  • the return spring is disposed axially between the first sealing ring and the spring support to bias the exhaust valve in the closing direction.
  • the valve closing body and the valve seat need not necessarily be designed as separate devices.
  • the valve closing body may be formed by a molding on the valve rod and the valve seat by a housing contour.
  • the exhaust valve can also have a plurality of valve closing bodies and valve seats.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Abstract

L'invention concerne une soupape d'échappement pour un moteur à combustion interne comprenant un carter (10) ayant une entrée de gaz d'échappement (14) et une sortie de gaz d'échappement (16), un corps de fermeture de soupape (26), une tige de soupape (20) sur laquelle le corps de fermeture de soupape (26) est fixé et qui peut être déplacé au moyen d'un actionneur (19), un siège de soupape (28), auquel le corps de fermeture de soupape (26) peut être abaissé et duquel peut être retiré par mouvement opposé le corps de fermeture de soupape (26), une douille (30) qui est noyée dans le carter (10) et entoure radialement la tige de soupape (20), et une première bague d'étanchéité (36a), caractérisée en ce que la première bague d'étanchéité (36a) est fixée à l'extrémité (41) de la douille (30) opposée au corps de fermeture de soupape (26) et repose radialement contre la tige de soupape (20) et la douille (30).
PCT/EP2019/059512 2018-04-25 2019-04-12 Soupape d'échappement pour un moteur à combustion interne Ceased WO2019206687A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018109904.5A DE102018109904B3 (de) 2018-04-25 2018-04-25 Abgasventil für eine Verbrennungskraftmaschine
DE102018109904.5 2018-04-25

Publications (1)

Publication Number Publication Date
WO2019206687A1 true WO2019206687A1 (fr) 2019-10-31

Family

ID=66182581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/059512 Ceased WO2019206687A1 (fr) 2018-04-25 2019-04-12 Soupape d'échappement pour un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102018109904B3 (fr)
WO (1) WO2019206687A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11933424B2 (en) 2021-07-19 2024-03-19 Caterpillar Inc. Gas admission valve including seal redundancy, and method of sealing a gas admission valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112009001400T5 (de) * 2008-08-13 2011-04-28 Mitsubishi Electric Corp. Abgasrezirkulationsventilvorrichtung
WO2012025351A1 (fr) 2010-08-26 2012-03-01 Pierburg Gmbh Soupape de recyclage de gaz d'échappement pour un moteur à combustion interne
EP2851549A2 (fr) * 2013-09-18 2015-03-25 Borgwarner Inc. Actionneur et dispositif de soupape
DE102015111461A1 (de) * 2015-05-07 2016-11-10 BorgWarner Esslingen GmbH Abgasrückführventil und Verfahren zur Verbesserung eines solchen Ventils
EP3258095A2 (fr) * 2016-06-18 2017-12-20 Kamtec, Inc. Soupape egr pour véhicules

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7213586B2 (en) * 2004-08-12 2007-05-08 Borgwarner Inc. Exhaust gas recirculation valve
EP2884086B1 (fr) 2013-12-11 2017-12-20 Borgwarner Inc. Actionneur avec retour de soupape

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112009001400T5 (de) * 2008-08-13 2011-04-28 Mitsubishi Electric Corp. Abgasrezirkulationsventilvorrichtung
WO2012025351A1 (fr) 2010-08-26 2012-03-01 Pierburg Gmbh Soupape de recyclage de gaz d'échappement pour un moteur à combustion interne
EP2851549A2 (fr) * 2013-09-18 2015-03-25 Borgwarner Inc. Actionneur et dispositif de soupape
DE102015111461A1 (de) * 2015-05-07 2016-11-10 BorgWarner Esslingen GmbH Abgasrückführventil und Verfahren zur Verbesserung eines solchen Ventils
EP3258095A2 (fr) * 2016-06-18 2017-12-20 Kamtec, Inc. Soupape egr pour véhicules

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11933424B2 (en) 2021-07-19 2024-03-19 Caterpillar Inc. Gas admission valve including seal redundancy, and method of sealing a gas admission valve

Also Published As

Publication number Publication date
DE102018109904B3 (de) 2019-10-02

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