EP0645524B1 - Joint de tige de soupape à monter sur un guide de tige de soupape tenu dans la culasse d'un moteur à combustion interne - Google Patents

Joint de tige de soupape à monter sur un guide de tige de soupape tenu dans la culasse d'un moteur à combustion interne Download PDF

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Publication number
EP0645524B1
EP0645524B1 EP94110441A EP94110441A EP0645524B1 EP 0645524 B1 EP0645524 B1 EP 0645524B1 EP 94110441 A EP94110441 A EP 94110441A EP 94110441 A EP94110441 A EP 94110441A EP 0645524 B1 EP0645524 B1 EP 0645524B1
Authority
EP
European Patent Office
Prior art keywords
valve stem
sealing
flange
cylinder head
stem 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.)
Revoked
Application number
EP94110441A
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German (de)
English (en)
Other versions
EP0645524A1 (fr
Inventor
Alberto Gallo
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.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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
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Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0645524A1 publication Critical patent/EP0645524A1/fr
Application granted granted Critical
Publication of EP0645524B1 publication Critical patent/EP0645524B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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 invention relates to a sealing arrangement with a valve stem seal for pushing onto a valve stem guide held in the cylinder head of an internal combustion engine according to the preamble of claim 1.
  • the stiffening tube On the side facing away from the first flange, the stiffening tube has a second, radially inwardly extending flange which is provided with a central recess, the first sealing lip being arranged in the recess.
  • the first and the second flange extend in the radial direction of the stiffening tube and are connected to one another by an annular section which extends exactly in the axial direction. The deflection of the two flanges extending in the radial direction into the section extending in the axial direction takes place essentially at right angles, the sealing element arranged radially on the inside of the section touching the valve stem guide along its entire axial extent.
  • the invention has for its object to develop such a valve stem seal in such a way that a good seal of the valve stem seal with respect to the unit formed by the valve stem guide and the cylinder head is guaranteed without proper use during intended use that it is necessary to apply greater forces when sliding the valve stem seal onto the valve stem guide.
  • the sealing element ends at the end facing the first flange in a hollow-conical surface and that the hollow-conical surface has an enlarged inner diameter in the direction of the first flange.
  • the second sealing lip is not deformed by the valve guide during assembly of the valve stem seal according to the invention. This greatly simplifies the fitting of the valve stem seal and no noteworthy forces are required for this.
  • the valve closing spring is designed as a helical compression spring with one end indirectly on the valve stem and the other end directly on the first Flange is supported.
  • the helical compression spring is installed standing under an elastic pre-tension in order to cause the valve to close automatically after an actuation.
  • the necessary and always available forces in the valve stem seal according to the invention ensure that the first flange, including the second sealing lip, which projects beyond it in the axial direction, is pressed against the cylinder head in a statically constant manner.
  • Such a helical compression spring is usually always used in conventional internal combustion engines. It is made of metal and is therefore largely free of fatigue. The sealing result achieved between the second sealing lip and the cylinder head is therefore of great durability.
  • An additional, annular sealing element is provided on the stiffening tube between the first and the second sealing lip at least at one point, which sealing element engages with a radially outwardly facing boundary surface of the valve stem guide. This ensures a concentric assignment of the valve stem seal during its intended use with respect to the valve stem seal without the sealing lip in engagement with the valve stem being exposed to an additional radial load.
  • the first and the second sealing lip as well as the sealing element are integrally merged.
  • the sealing element ends at the end facing the first flange in a hollow-conical surface which has an inner diameter widened in the direction of the first flange. This makes it easier to attach the valve stem seal to a valve stem.
  • the end of the valve stem guide facing the valve stem seal in the push-on direction is preferably tapered, so that this results in a particularly simple mounting option for the valve stem seal according to the invention.
  • the sealing element primarily has management tasks, as mentioned above. It is therefore not necessary to give the sealing element a particularly large oversize, based on the gap available in the radial direction between the stiffening tube and the valve stem guide. An even easier deformability of the sealing element is ensured if it is at least on the inside a ring-shaped sealing bead is limited, which can be brought into engagement with the radially outwardly facing boundary surface of the valve stem guide.
  • the sealing bead can have a rounded and preferably a bell-shaped limited profile.
  • the stiffening tube can be provided at the end facing away from the first flange with a radially inwardly projecting second flange, the base of the first sealing lip at the inward-facing end of the Profile second flange is set.
  • the fulcrum of the profile of the first sealing lip which results from a radial relative displacement is hereby displaced in the vicinity of the surface of the valve stem, which allows the axial length of the first sealing lip to be reduced and material to be saved in this way.
  • valve stem seal according to the invention is that it not only prevents lubricating oil from penetrating into the sealing gap between the valve stem and the valve stem guide, but also that the further sealing gap between the valve stem guide and the cylinder head prevents lubricating oil and one from being applied Ingress of lubricating oil is protected.
  • lubricating oil can pass through the last-mentioned sealing gap.
  • the fit between the valve stem guide and the cylinder head can thus be dimensioned more generously than in the previously known designs.
  • valve stem guides that have an incorrectly machined surface or that consist of a highly porous, self-lubricating sintered material. Since in the valve stem seal according to the invention the actual valve stem guide is insulated from the oil circulating in the internal combustion engine, there is no risk that this oil will penetrate the pores of the valve stem guide and enter the combustion chamber or exhaust tract of the internal combustion engine.
  • valve head 12 which is cut parallel to the axis of a valve 1.
  • the valve can form an inlet or outlet valve. It has a valve plate 2 at its projecting end, which can be brought into engagement with a sealing seat 4.
  • the valve stem 6 is mounted in a longitudinally movable manner in a valve stem guide 8, which is anchored in a bore 10 of the cylinder head 12 by a press fit. The valve stem 6 penetrates the entire length of the valve stem guide.
  • a spring plate 16 is attached, which is supported indirectly by a compression spring 14 on the cylinder head 12.
  • a rocker arm 22 is provided, which can be brought into engagement with the upper end of the valve stem 6 and is able to displace it, including the valve plate 2, relative to the valve stem guide 8 downwards. A flow-through gap is created between the valve plate 2 and the valve seat 4.
  • valve stem seal 24 shown in FIG. 1 is further described below with reference to FIG. 2.
  • the valve stem seal 24 is intended to be pushed onto a valve stem guide 8 held in the cylinder head 12 of an internal combustion engine, which extends beyond the cylinder head 12 in the region of its upper side.
  • the valve stem seal 24 includes a stiffening tube 26, which generally consists of deep-drawn sheet steel.
  • the stiffening tube 26 is connected at the upper end to an annular, first sealing lip 30 made of elastic material. It ends at the bottom in a radially outwardly projecting first flange 18, which is supported on the cylinder head 12.
  • the stiffening tube 26 with a second sealing lip 34 is made of elastic Connected material that projects beyond the first flange 18 in the axial direction, the second sealing lip 34 being at a radial distance from the valve stem guide 8 and can be brought into engagement with the cylinder head in the region of an annular surface which surrounds the valve stem guide 8.
  • the first flange 18 is loaded on the upper side by the valve closing spring 14. This has a spring force that is greater than the force that is required for an elastic deformation of the second sealing lip 34. The latter is thereby deformed axially and radially inwards, resulting in a liquid-tight connection to the cylinder head and a firm contact between the first flange 18 and the top of the cylinder head 12.
  • the spatial position of the valve stem seal is thereby determined just as precisely as that for a deflection of the valve closing spring 14 available spring travel during valve actuation.
  • An additional annular sealing element 28 is provided on the stiffening tube 26 between the first and the second sealing lip (30, 34), which can be brought into engagement with the radially outwardly facing boundary surface of the valve stem guide 8. In addition to an additional seal, this results in a coaxial guidance of the valve stem seal 24 on the valve stem guide 8.
  • the first and the second sealing lip 30, 34 are integrally formed into one another with the sealing element 28.
  • the latter 28 is delimited at the end facing the first flange 18 by a hollow conical surface which has an inner diameter widened in the direction of the first flange 18.
  • the sealing element 28 is provided in the area of the inner surface engaging with the valve stem guide 8 during the intended use with five successive sealing beads 36 in the axial direction have a bell-like profile. The deformation forces required for being pushed onto the valve stem guide 8 are thereby reduced again.
  • the stiffening tube 26 is provided at the end facing away from the first flange 18 with a radially inwardly projecting second flange, the first sealing lip 30 being fixed with its base to the inwardly facing end of the profile.
  • the pivot point of the profile of the sealing lip 30 is thereby displaced in the direction of the surface of the valve stem 6, which makes it possible to give the sealing lip 30 a particularly small cross-section and to save material during its manufacture.
  • the sealing lip 30 is provided with an annular groove.
  • a helical spring 32 made of metallic material is mounted in this. The helical spring ensures a largely balanced pressing force of the sealing lip 30 against the surface of the valve stem 6 to be sealed over long periods of time.
  • the sealing lip 34 is fixed to a transition zone of the stiffening tube 26 which is rounded in profile. This begins at a surface that extends parallel to the surface of the cylinder head 12 and ends in a surface that encloses the valve stem guide 8 in a hollow cylindrical manner at a radial distance.
  • the second sealing lip 34 in turn also has a semicircular profile. As a result of this and as a result of the special mounting position and the use of an easily deformable rubber material in its manufacture, the second sealing lip is able to conform to the finest surface irregularities of the cylinder head 12 when the first flange 18 is axially pressed onto the cylinder head 12. As a result, the lubricant which is always present in the area of the outside of the valve stem seal 24 can no longer pass the sealing gap and can reach the area of the gap 10 between the cylinder head 12 and the valve stem guide 8.

Claims (4)

  1. Dispositif d'étanchéité avec un joint de tige de soupape à monter sur un guide de tige de soupape (8) tenu dans la culasse (12) d'un moteur à combustion interne, comprenant un tube de renfort (26) qui est relié, à l'une de ses extrémités, à une première lèvre d'étanchéité (30) de forme annulaire en matière élastique et se termine, à l'autre extrémité, par une première bride (18) saillant radialement vers l'extérieur qui peut être appuyée sur la culasse (12), le tube de renfort (26) étant relié à une seconde lèvre d'étanchéité (34) en matière élastique qui dépasse la première bride (18) dans le sens axial, la seconde lèvre d'étanchéité (34) présentant une distance radiale par rapport au guide de tige de soupape (8) et pouvant être mise en contact avec une surface en couronne de la culasse (12) qui entoure le guide de tige de soupape (8), un élément d'étanchéité (28) supplémentaire de forme annulaire étant prévu, en au moins un endroit, au niveau du tube de renfort (26), entre les première et seconde lèvres d'étanchéité (30, 34), l'élément d'étanchéité (28) pouvant être mis en contact avec une surface de limitation du guide de tige de soupape (8) dirigée radialement vers l'extérieur et les première et seconde lèvres d'étanchéité (30, 34) ainsi que l'élément d'étanchéité (28) étant formés de manière à se confondre, caractérisé en ce que l'élément d'étanchéité (28) se termine, au niveau de l'extrémité située du côté de la bride (18), par une surface en cône creux et en ce que la surface en cône creux a un diamètre intérieur élargi dans la direction de la première bride (18).
  2. Joint d'étanchéité selon la revendication 1, caractérisé en ce que l'extrémité du guide de tige de soupape (8) située du côté du joint de tige de soupape dans le sens de montage a une forme effilée à la manière d'un cône.
  3. Joint d'étanchéité selon l'une des revendications 1 à 2, caractérisé en ce que l'élément d'étanchéité (28) est limité, sur le côté intérieur, par au moins un bourrelet d'étanchéité (36) de forme annulaire saillant radialement vers l'intérieur, et en ce que le bourrelet d'étanchéité (36) peut être mis en contact avec la surface de limitation du guide de tige de soupape (8) saillant radialement vers l'extérieur.
  4. Joint d'étanchéité selon l'une des revendications 1 à 3, caractérisé en ce que le tube de renfort (26) est pourvu, à l'extrémité éloignée de la première bride (18), d'une seconde bride saillant radialement vers l'intérieur, et en ce que la première lèvre d'étanchéité (30) est fixée, par sa base, sur l'extrémité du profil de la seconde bride (18) saillant vers l'intérieur.
EP94110441A 1993-09-28 1994-07-05 Joint de tige de soupape à monter sur un guide de tige de soupape tenu dans la culasse d'un moteur à combustion interne Revoked EP0645524B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930705 1993-09-28
ITTO930705A IT1261592B (it) 1993-09-28 1993-09-28 Guarnizione di tenuta per una valvola di un motore a combustione interna

Publications (2)

Publication Number Publication Date
EP0645524A1 EP0645524A1 (fr) 1995-03-29
EP0645524B1 true EP0645524B1 (fr) 1997-09-10

Family

ID=11411756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110441A Revoked EP0645524B1 (fr) 1993-09-28 1994-07-05 Joint de tige de soupape à monter sur un guide de tige de soupape tenu dans la culasse d'un moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP0645524B1 (fr)
DE (1) DE59404017D1 (fr)
ES (1) ES2108342T3 (fr)
IT (1) IT1261592B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19949248A1 (de) 1999-10-13 2001-04-19 Freudenberg Carl Fa Ventilschaftabdichtung
DE10151606C1 (de) 2001-10-18 2002-10-17 Skf Ab Ventilschaftdichtung
FR2867226A1 (fr) * 2004-03-05 2005-09-09 Simcoo Nouveau moyen d'etancheite pour queues de soupapes de moteurs thermiques de faible puissance et ses utilisations

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210956A (en) * 1987-10-14 1989-06-21 Dana Corp Unitary molded plastics valve seal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT7967950A0 (it) * 1979-05-07 1979-05-07 Supertex Spa Gruppo costituito da guarnizione di tenuta per steli di valvole e da scodellino di appoggio molle
GB8629408D0 (en) * 1986-12-09 1987-01-21 Ford Motor Co Valve assembly
US5295461A (en) * 1992-04-13 1994-03-22 Ford Motor Company Oil-starved valve assembly
US5207196A (en) * 1992-07-31 1993-05-04 Trw Inc. Pre-assembled unit for engine valve system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210956A (en) * 1987-10-14 1989-06-21 Dana Corp Unitary molded plastics valve seal

Also Published As

Publication number Publication date
DE59404017D1 (de) 1997-10-16
EP0645524A1 (fr) 1995-03-29
ITTO930705A1 (it) 1995-03-28
ES2108342T3 (es) 1997-12-16
ITTO930705A0 (it) 1993-09-28
IT1261592B (it) 1996-05-23

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