EP1749980B1 - Joint de tige de soupape d'un moteur à combustion interne - Google Patents

Joint de tige de soupape d'un moteur à combustion interne Download PDF

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Publication number
EP1749980B1
EP1749980B1 EP05425571A EP05425571A EP1749980B1 EP 1749980 B1 EP1749980 B1 EP 1749980B1 EP 05425571 A EP05425571 A EP 05425571A EP 05425571 A EP05425571 A EP 05425571A EP 1749980 B1 EP1749980 B1 EP 1749980B1
Authority
EP
European Patent Office
Prior art keywords
axis
gasket
valve
elastically deformable
segment
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
EP05425571A
Other languages
German (de)
English (en)
Other versions
EP1749980A1 (fr
Inventor
Flavio Lantelme
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.)
Freudenberg Sealing Technologies SAS di Externa Italia SRLU
Original Assignee
Corcos Industriale SAS di Externa Italia SRL
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 Corcos Industriale SAS di Externa Italia SRL filed Critical Corcos Industriale SAS di Externa Italia SRL
Priority to DE602005026801T priority Critical patent/DE602005026801D1/de
Priority to EP05425571A priority patent/EP1749980B1/fr
Priority to US11/460,489 priority patent/US20070022997A1/en
Priority to CN2006101412714A priority patent/CN1920266B/zh
Priority to JP2006210200A priority patent/JP5162112B2/ja
Publication of EP1749980A1 publication Critical patent/EP1749980A1/fr
Application granted granted Critical
Publication of EP1749980B1 publication Critical patent/EP1749980B1/fr
Priority to JP2012156674A priority patent/JP2012211593A/ja
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant

Definitions

  • the present invention relates to a gasket for a valve of an internal combustion engine.
  • a head defining a plurality of combustion chambers and of respective cylinders, inside which is performed an engine cycle adapted to transform the chemical energy present in a mixture of combustible gas and air into mechanical energy. Furthermore, the head defines a feeding unit adapted to bring forward inside the combustion chambers the mixture of combustible gas and air, and an exhaust unit adapted to carry away the burnt gas and the air from the combustion chambers.
  • the feeding unit comprises a plurality of suction pipes adapted to feed respective combustion chambers with the combustible gas and combustion air, and a plurality of suction valves interfering, via a respective shutter section and according to predetermined time laws, with respective suction pipes for regulating the flow of the combustible gas and the combustion air towards each combustion chamber.
  • the exhaust unit comprises a plurality of pipes adapted to carry away the burnt gas and air from respective combustion chambers towards an environment external to the engine, and a plurality of exhaust valves interfering, via a respective shutter section and according to predetermined time laws, with the respective exhaust pipes for regulating the flow of burnt gas and combustion air towards the exhaust pipes themselves.
  • each suction/exhaust valve comprises, in general, a guiding element fastened inside a cavity made in the head and a stem slidingly mobile in opposite directions within a through seat defined by the guiding element.
  • Such gaskets define, towards the combustion chambers, firstly a dynamic type seal for allowing only a minimum flow of oil needed to lubricate the coupling between the stem and the guiding element and, then, a static type seal to prevent a second flow path of the oil to the combustion chamber.
  • the gaskets normally include an elastomeric portion pressed on the stem and on the guiding element to achieve the aforementioned sealing functions, and a supporting element fitted on the elastomeric portion to press the same onto the stem and onto the guiding element.
  • a first fraction of an internal surface of the elastomeric portion cooperates directly with the stem so as to allow the minimum flow of oil needed to lubricate the coupling between stem and guiding element (dynamic seal), and a second fraction of the abovementioned internal surface, arranged between the first fraction and the combustion chamber, cooperates with the guiding element preventing the leakage of lubricant oil towards the combustion chambers (static seal).
  • DE-C-19949471 discloses a gasket for a valve according to the preamble of claim 1.
  • Document FR-A-2580766 discloses a similar gasket.
  • FIG. 1 it is indicated as a whole with 1 an internal combustion engine adapted to transform the chemical energy contained in a fuel into mechanical energy and shown only in that is necessary for understanding the present invention.
  • figure 1 it is shown the engine 1 limitedly to a head 2 extending symmetrically with respect to an axis A and shown only partially.
  • the head 2 defines a combustion chamber 3 (only partially shown) inside which a combustible gas is oxidised in presence of combustion air so to transform the chemical energy contained in the combustible gas into pressure energy, and a cylinder 4 (also only partially shown) of axis A fluidically connected to the combustion chamber 3 and adapted to transform the aforementioned pressure energy into mechanical energy.
  • the head 2 moreover, accommodates a feeding unit (not shown) adapted to bring forward, into the combustion chamber 3, a mixture comprising the combustible gas and the combustion air, and an exhaust unit 5 adapted to carry away the burnt gas and air from the combustion chamber 3 itself towards an environment external to the engine 1.
  • a feeding unit (not shown) adapted to bring forward, into the combustion chamber 3, a mixture comprising the combustible gas and the combustion air
  • an exhaust unit 5 adapted to carry away the burnt gas and air from the combustion chamber 3 itself towards an environment external to the engine 1.
  • the cylinder 4 comprises a liner 6 and a piston 7, which is sliding under the action of the pressure of the fuel inside the liner 6 itself according to an alternating motion directed along the axis A and is operatively connected in a way not shown to an engine member to transform the pressure energy into mechanical energy.
  • the combustion chamber 3 is axially delimited by an end wall 8 and is open, on axially opposite part with respect to the end wall 8, towards the cylinder 4.
  • the end wall 8 of the combustion chamber 3 presents a pair of circular and through openings, only one of which is shown and indicated with 9, and arranged symmetrically with respect to the axis A. More in particular, the opening not shown is adapted to allow the passage of the mixture comprising the combustible gas and the combustion air coming from the feeding unit to the inside of the combustion chamber 3; the opening 9 is adapted to allow the passage of burnt gas and air from the combustion chamber 3 to the exhaust unit 5.
  • the exhaust unit 5 and the feeding unit are entirely similar; the present description makes reference, for simplicity, to the exhaust unit 5 only.
  • the exhaust unit 5 comprises an exhaust pipe 11 extending from opening 9 towards the environment external to the engine 1, and an exhaust valve 12 adapted to engage, according to predetermined time laws, the opening 9 so as to adjust the flow of burnt gas and air from the combustion chamber 3 to the exhaust pipe 11.
  • valve 12 shown in detail in figure 2 , is accommodated in a seat 14, which is made on the head 2 and normally contains lubricant oil.
  • the seat 14 is extended symmetrically with respect to an axis B, transversal with respect to the axis A, and is open, at its own axial terminal portion 15 with respect to the exhaust pipe 11.
  • valve 12 comprises a tubular guiding element 16 interferencely fitted inside the terminal portion 15 of the seat 14, one stem 17 slidingly mobile in opposite directions along the axis B within the guiding element 16, and a gasket 18 coaxially surrounding the stem 17 and the guiding element 16 so as to prevent the flow of oil from the seat 14 towards the combustion chamber 3.
  • the stem 17 protrudes on opposite sides from the guiding element 16.
  • the stem 17, moreover, comprises at its opposite axial ends, a shutter section 20 intended to fluidtightly engage the opening 9 and a section 19 adapted to receive an actuating force via a control mechanism 21, in the case shown of the cam and tappet type.
  • the valve 12 moreover, comprises a spring 22, in the case shown of the helical type, which is fastened, at its mutually opposite axial ends, to a delimitation wall of the seat 14 and the section 19, and is adapted to generate an elastic return force on the stem 17 during the alternating motion of the stem 17 itself.
  • the gasket 18 presents an annular conformation according to an axis coinciding, in assembly conditions, with the axis B.
  • the gasket 18 comprises an annular shaped elastomeric element 25, and a supporting element 26 coaxially fastened onto the elastomeric element 25 to press the elastomeric element 25 itself, in the radial direction with respect to the axis B, onto the stem 17 and onto the guiding element 16.
  • the elastomeric element 25 defines, proceeding along the axis B towards the combustion chamber 3, firstly a seal of the dynamic type adapted to allow the passage of a minimum flow of oil needed to lubricate the coupling between the stem 17 and the guiding element 16, and then a seal of the static type to prevent a second flow of oil towards the combustion chamber 3.
  • the elastomeric element 25 comprises two mutually opposite discoid and axial end sections 27, 28, an internal circumferential surface 29 adapted to cooperate in part with the stem 17 and in part with the guiding element 16 to make the abovementioned seals, and an external circumferential surface 30 adapted to couple with the supporting element 26 and with an annular collar 31 so as to press the internal circumferential surface 29 onto the stem 17 and onto the guiding element 16.
  • the section 27, in assembly conditions, is facing towards the control mechanism 21 and is crossed by the stem 17; the section 28, in assembly conditions, is facing towards the combustion chamber 3, and is crossed by both the stem 17 and the guiding element 16.
  • the internal circumferential surface 29 of the elastomeric element 25 comprises a section 33 of minimum diameter, arranged next to the section 27 and adapted to be radially pressed by the collar 31 against the stem 17 to define a circumferential sealing line of the dynamic type, which allows, thanks to the sliding coupling between the stem 17 and the section 27, the leakage of a minimum flow of oil.
  • the internal circumferential surface 29 of the elastomeric element 25 further comprises an essentially cylindrical portion 32, arranged next to the section 28 and adapted to be radially pressed by the supporting element 26 against the fluidtightly guiding element 16 so as to define a cylindrical sealing area of the static type.
  • the circumferential external surface 30 of the elastomeric element 25 presents, in the proximity of the section 27, a recess 36 (whose function will be explained below), which splits the external circumferential surface 30 itself into an accommodation seat 34 of the collar 31, and an elongated portion 35 extending towards the section 28 and adapted to couple with the supporting element 26.
  • the supporting element 26 comprises a portion 42 extending transversally to the axis B and adapted to receive an action with component parallel to the axis B to facilitate the assembly of the gasket 18 on the valve 12, and a portion 41 elongated towards the axis B starting from the portion 42 and in turn comprising a segment 45 having increasing radial dimensions towards the portion 42 itself so as to reduce the volume of the elastomeric element 25.
  • the portion 41 is adapted to cooperate with the segment 35 of the elastomeric element 25, and comprises a segment 43 and a segment 44, having a radial dimension higher than that of the segment 43, which define opposite axial ends of the portion 41 itself.
  • the segments 43 and 44 present cylindrical conformation and are both connected to the segment 45, which presents conical conformation.
  • segment 43 and the segment 44 present higher extensions than the segment 45 in the direction of the axis B.
  • segment 43 presents a free axial end 46 bent back towards the axis B so as to axially withhold the elastomeric element 25.
  • the portion 42 has discoid shape, and comprises a fraction 50 accommodated inside the recess 36 to fasten the supporting element 26 to the elastomeric element 25; the portion 42 also comprising a fraction 51, radially more external with respect to the fraction 50, adapted to cooperate axially with the elastomeric element 25 on the side of the section 28 and to remain free, on the axially opposite part, to allow the application of the action directed along the axis B in assembly conditions.
  • the gasket 18 permits to obtain a two-fold advantage: the amount of elastomeric material required is lower inasmuch the segment 45 presents decreasing radial dimensions towards the portion 42, and the assembly of the gasket 18 itself on the valve 12 is facilitated inasmuch it is possible to apply an action directed parallelly to the axis B on the fraction 51, once the supporting element 26 is fitted onto the elastomeric element 25.
  • gasket 18 allows to contain the elastomeric element 25 in the correct assembly position because the end 46 is bent back towards the axis B.
  • gasket 18 could be used, in an entirely similar way, on the feeding unit suction valves.
  • portion 42 of the supporting element 26 might also be entirely free from one or both the axial segments 43 and 44 and therefore have, in the latter case, an entirely tapered pattern with respect to the axis B.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Lift Valve (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Gasket Seals (AREA)

Claims (3)

  1. Joint (18) pour une soupape (12) d'un moteur à combustion interne (1) comprenant :
    un élément de support (26) ayant une conformation tubulaire selon un axe (B) ; et
    un élément élastiquement déformable (25) adapté pour être placé entre ladite soupape (12) et ledit élément de support (26) ;
    ledit élément de support (26) comprenant une première partie (42) s'étendant transversalement par rapport audit axe (B) et est adapté pour recevoir une action avec un composant parallèle à l'axe (B) lui-même afin de faciliter l'assemblage dudit joint (18) sur ladite soupape (12), et une deuxième partie (41) allongée selon ledit axe (B) et commençant à partir de ladite première partie (42) ; ladite deuxième partie (41) coopérant avec ledit élément élastiquement déformable (25) et comprenant à son tour au moins un segment (45) ayant des dimensions radiales croissantes vers la première partie (42) elle-même afin de réduire le volume dudit élément élastiquement déformable (25) ;
    ladite deuxième partie (41) définissant une extrémité axiale (46) dudit élément de support (26) opposée à ladite première partie (42) ; caractérisé en ce que ladite extrémité axiale (46) coopère axialement avec ledit élément élastiquement déformable (25) et est ramenée vers ledit axe (B) pour retenir axialement ledit élément élastiquement déformable (25).
  2. Joint selon la revendication 1, caractérisé en ce que ladite deuxième partie (41) comprend un premier segment d'extrémité axiale (43) et un deuxième segment d'extrémité axiale (44) s'étendant parallèlement audit axe (B) et mutuellement assemblés par ledit segment de dimension radiale croissante (45).
  3. Joint selon la revendication 1 ou 2, caractérisé en ce que ladite première partie (42) comprend une première fraction (50) fixée sur ledit élément élastiquement déformable (25) et une deuxième fraction (51) radialement plus interne par rapport à ladite première fraction (50), au moins en partie libre dans la direction dudit axe (B) pour recevoir ladite action avec le composant parallèle audit axe (B).
EP05425571A 2005-08-01 2005-08-01 Joint de tige de soupape d'un moteur à combustion interne Active EP1749980B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE602005026801T DE602005026801D1 (de) 2005-08-01 2005-08-01 Ventilschaftdichtung für eine Brennkraftmaschine
EP05425571A EP1749980B1 (fr) 2005-08-01 2005-08-01 Joint de tige de soupape d'un moteur à combustion interne
US11/460,489 US20070022997A1 (en) 2005-08-01 2006-07-27 Gasket for a valve of an internal combustion engine
CN2006101412714A CN1920266B (zh) 2005-08-01 2006-08-01 内燃机的阀衬垫
JP2006210200A JP5162112B2 (ja) 2005-08-01 2006-08-01 内燃機関の弁用のガスケット
JP2012156674A JP2012211593A (ja) 2005-08-01 2012-07-12 内燃機関の弁用のガスケット

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425571A EP1749980B1 (fr) 2005-08-01 2005-08-01 Joint de tige de soupape d'un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP1749980A1 EP1749980A1 (fr) 2007-02-07
EP1749980B1 true EP1749980B1 (fr) 2011-03-09

Family

ID=35613644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425571A Active EP1749980B1 (fr) 2005-08-01 2005-08-01 Joint de tige de soupape d'un moteur à combustion interne

Country Status (5)

Country Link
US (1) US20070022997A1 (fr)
EP (1) EP1749980B1 (fr)
JP (2) JP5162112B2 (fr)
CN (1) CN1920266B (fr)
DE (1) DE602005026801D1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602005026801D1 (de) * 2005-08-01 2011-04-21 Corcos Ind S A S Di Externa Italia S R L Ventilschaftdichtung für eine Brennkraftmaschine
US8235394B2 (en) 2007-12-06 2012-08-07 Freudenberg-Nok General Partnership Valve stem seal with gas relief features
US8011669B2 (en) * 2007-12-06 2011-09-06 Freudenberg-Nok General Partnership Valve stem seal with gas relief features
DE102011083743A1 (de) * 2011-09-29 2013-04-04 Aktiebolaget Skf Ventilschaftdichtung
US9371749B2 (en) 2012-02-08 2016-06-21 Dana Automotive Systems Group, Llc Hybrid valve stem seal retainer assembly
ITTO20130894A1 (it) * 2013-11-04 2015-05-05 Corcos Ind S A S Di Extern A Italia S R L Guarnizione per una valvola di un motore a combustione interna
ITTO20131018A1 (it) * 2013-12-13 2015-06-14 Corcos Ind S A S Di Extern A Italia S R L Guarnizione per una valvola di un motore a combustione interna
US10557389B2 (en) * 2018-04-04 2020-02-11 Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. Gasket for a valve of an internal combustion engine
DE102021102911A1 (de) 2021-02-09 2022-08-11 Audi Aktiengesellschaft Ventilschaftdichtung für eine Brennkraftmaschine sowie entsprechende Brennkraftmaschine

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1550247A1 (de) * 1966-05-13 1969-07-10 Goetzewerke Ventilschaftabdichtung
JPS469616Y1 (fr) * 1968-07-25 1971-04-05
JPS5620485Y2 (fr) * 1972-03-01 1981-05-15
JPS5865372A (ja) * 1981-09-18 1983-04-19 ゲツツエ・アクチエンゲゼルシヤフト リツプシ−ルリング
DE3222356C2 (de) * 1981-09-18 1984-09-13 Goetze Ag, 5093 Burscheid Ventilschaftabdichtung für Brennkraftmaschinen
JPS5919907U (ja) * 1982-07-29 1984-02-07 内山工業株式会社 バルブステムシ−ル
FR2580766B1 (fr) * 1985-04-23 1989-05-19 Peugeot Dispositif d'etancheite pour tige coulissante, notamment pour tige de soupape
DE4119952A1 (de) * 1991-06-18 1992-12-24 Goetze Ag Ventilschaftabdichtung
DE19709170C2 (de) * 1997-03-06 1999-11-04 Cr Elastomere Gmbh Abdichtung für hin- und hergehende Maschinenteile, insbesondere Ventilschaftabdichtung
US5775284A (en) * 1997-05-07 1998-07-07 Freudenberg-Nok General Partnership Two-piece valve stem seal
DE19949471C1 (de) * 1999-10-14 2001-05-03 Cr Elastomere Gmbh Verfahren zur Herstellung einer Ventilschaftabdichtung
US6679502B1 (en) * 2001-08-28 2004-01-20 Dana Corporation Valve stem seal assembly with valve guide retainer
DE10207818B4 (de) * 2002-02-25 2006-04-06 Carl Freudenberg Kg Ventilschaftabdichtung an Verbrennungskraftmaschinen
CN2544104Y (zh) * 2002-06-11 2003-04-09 青岛基珀密封工业有限公司 高性能气门导杆油封
US6938877B2 (en) * 2003-07-02 2005-09-06 Dana Corporation Valve stem seal assembly
DE602005026801D1 (de) * 2005-08-01 2011-04-21 Corcos Ind S A S Di Externa Italia S R L Ventilschaftdichtung für eine Brennkraftmaschine

Also Published As

Publication number Publication date
EP1749980A1 (fr) 2007-02-07
JP2012211593A (ja) 2012-11-01
JP2007040306A (ja) 2007-02-15
CN1920266A (zh) 2007-02-28
US20070022997A1 (en) 2007-02-01
CN1920266B (zh) 2013-03-13
DE602005026801D1 (de) 2011-04-21
JP5162112B2 (ja) 2013-03-13

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