EP0639695B1 - Joint de tige de soupape - Google Patents

Joint de tige de soupape Download PDF

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Publication number
EP0639695B1
EP0639695B1 EP19940107573 EP94107573A EP0639695B1 EP 0639695 B1 EP0639695 B1 EP 0639695B1 EP 19940107573 EP19940107573 EP 19940107573 EP 94107573 A EP94107573 A EP 94107573A EP 0639695 B1 EP0639695 B1 EP 0639695B1
Authority
EP
European Patent Office
Prior art keywords
valve stem
stem seal
sealing ring
cylindrical section
sealing
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.)
Expired - Lifetime
Application number
EP19940107573
Other languages
German (de)
English (en)
Other versions
EP0639695A1 (fr
Inventor
Claude Caillaud
Laurent Salagnac
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 EP0639695A1 publication Critical patent/EP0639695A1/fr
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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 valve stem seal comprising a rigid tube which is delimited at one end by a first cylinder section and at the other end by a radially outwardly projecting flange, a sealing ring being inserted in the cylinder section in a self-locking manner, one in the axial direction has protruding, radially elastic sealing lip which can be brought into engagement with the valve stem.
  • valve stem seal is known from EP A 0 380 770. It is pushed onto the end of a tubular valve guide for intended use, the sealing lip coming into sealing contact with the valve stem and a further seal with the outer circumference of the valve guide.
  • the sealing ring is delimited on the outside by a stiffening ring, which is inserted so tightly into the cylinder section of the deformation-resistant tube that it can be handled, stored, transported, assembled and used relatively easily without avoiding a relative displacement of the two parts with respect to one another. In order to meet these conditions, assembly requires the precise observance of fine manufacturing tolerances and the use of large press-in forces.
  • the latter are of the order of magnitude of 1000 to 2000 N if the play between the outer circumference of the stiffening ring and the inner circumference of the cylinder section is 30 to 60 ⁇ m. Greater forces cannot be absorbed by the two parts when they are put into one another if damage is to be avoided. Smaller forces are sufficient if the manufacturing tolerances are increased. However, it must then be taken into account that not the problem-free use of the Valve stem seals provide the desired tight fit. For this reason, it is customary to take special care in the manufacture of the pipe and the stiffening ring and to calibrate the surfaces that come into contact with one another during assembly to an exact dimension. This inevitably results in very high manufacturing costs.
  • the object of the invention is to further develop such a valve stem seal in such a way that a reliable fixing of the two parts into one another after assembly is ensured with simplified manufacture.
  • the valve stem seal according to the invention should in particular allow the tolerances to be observed during production to be increased while avoiding other disadvantages.
  • the ribs are evenly distributed in the circumferential direction.
  • the deformation forces resulting when the two parts are joined together are accordingly also uniformly distributed in the circumferential direction.
  • the implementation of the joining process is significantly simplified.
  • the valve stem seal can then be used and installed as a self-contained unit.
  • the ribs expediently have a triangular profile, which is arranged in such a way that the base reinforces the cylinder section or sealing ring on which the respective rib is arranged, and the tip touches the mating surface after assembly.
  • the height of the ribs is a few hundredths of a millimeter more than the difference between half the inner diameter of the cylinder section and half the outer diameter of the sealing ring.
  • valve stem seal according to the invention is that both the cylinder section and the stiffening ring can have large manufacturing inaccuracies without the resultant impairment of the resulting adhesive connection after the two parts have been inserted into one another.
  • the cylinder section can be delimited at the end facing away from the first flange by a second, radially inwardly projecting flange. This further increases the security against a breakup of the connection between the two parts.
  • the cylinder section and the second flange overlap the sealing ring and the sealing lip over their entire axial length and that the sealing lip is freely movable in the radial direction.
  • the sealing lip is excellently protected from damage by the cylinder section or second flange surrounding it, which is of great advantage during manufacture, storage, transport and assembly of the valve stem seal.
  • valve stem seal is preferably used in a vertical position, the spray oil present in the area of the valve control reaching the space between the cylinder section, the sealing lip and the valve stem and building up.
  • the pent-up oil can linger here for a long time even when the internal combustion engine is stopped, which means that it is immediately available for lubrication when it is restarted.
  • the wear of the valve stem seal according to the invention is thereby reduced and its service life is significantly improved.
  • the sealing ring expediently consists of a stiffening ring, for example made of metal or plastic, and an elastic sealing element.
  • the latter can, in one piece, merge into one another at least one sealing lip which can be brought into engagement with the valve stem and at least one sealing rib which can be brought into engagement with the valve guide.
  • the latter is expediently molded onto the stiffening ring in such a way that after the valve stem seal has been pushed onto the outer circumference of a valve guide, there is a radial compression of the sealing rib between the valve guide and the stiffening ring.
  • the ribs 13 extend parallel to the axis 1a of the valve stem seal.
  • the surfaces delimiting them in the circumferential direction intersect one another in radially inward-pointing edges at an angle of 72 °. Depending on the requirements in the individual case, the angle can optionally be chosen to be larger or smaller.
  • the sealing ring is enclosed in the area touched by the ribs 13 by a metallic stiffening ring 11.
  • the stiffening ring 11 has half the outer diameter r in the region engaging the ribs (FIG. 2). In the usual sizes of motor vehicle engines, this is a few hundredths of a millimeter larger than the radius of an imaginary cylinder surface on which the radially inward-pointing tips of the ribs 13 are arranged in new and undeformed condition.
  • the sealing lip 8 is enclosed by the cylinder section 3 and the second flange 4 of the deformation-resistant tube 6. It is thereby protected from damage in an excellent manner, which is of considerable advantage during manufacture, storage and assembly. Nevertheless, the sealing lip 8 is also extremely mobile in the radial direction during the intended use, which is of great advantage for achieving a good sealing result.
  • the sealing lip 8 is provided on the outside with a circumferential groove in which a pressure spring 9 is embedded.
  • the deformation-resistant tube 1 has between the cylinder section 3 and the first flange 2 in a partial area a conical in the direction of the first flange 2 an enlarged inner diameter.
  • the insertion of the sealing ring 7 from the direction of the first flange 2 is greatly facilitated.
  • the sealing element 10, comprising the sealing lip 8, of the sealing ring 7 is made of rubber in the exemplary embodiment shown. Other materials used in this field can also be used in relation to its production.
  • the stiffening ring of the sealing ring 7 has a larger outside diameter 13 in the area opposite the cylinder section 3 than in the partial area 11 adjoining in the direction of the first flange 2.
  • the press-in forces required for inserting the sealing ring 7 into the deformation-resistant tube 6 are therefore due to that absolutely necessary measure reduced.
  • During the insertion there is a plastic deformation of the edges of the ribs 13 pointing inwards in the radial direction. This occurs only to the extent that the stiffening ring 11 is actually pressed into the deformation-resistant tube 6.
  • the press-in process was stopped before the ribs were completely deformed in the axial direction.
  • a step 15 has been preserved, which prevents the sealing ring 7 from being displaced further towards the second flange 4 during assembly or use of the valve stem seal and from reaching a point at which its function is impaired.
  • a further cylindrical portion of the rigid tube 1 is present between the hollow-conical portion 5 of the rigid tube and the first flange 2.
  • the first flange 2 also serves to support the valve spring on a cylinder head, not shown, of an internal combustion engine and protects it from damage by the Valve spring. It preferably includes the tube 1 from a deep-drawn sheet steel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Multiple-Way Valves (AREA)

Claims (8)

  1. Joint de tige de soupape constitué d'un tube résistant à la déformation (1) limité à une extrémité par une première partie de cylindre (3) et à l'autre extrémité par une bride (2) saillante de façon radiale vers l'extérieur, dans lequel un anneau d'étanchéité (7) présentant une lèvre d'étanchéité (9) à élasticité radiale et saillante en sens axial qui peut être enclenchée avec la tige de la soupape est inséré de manière autobloquante dans la partie du cylindre (3), caractérisé en ce que des nervures (13) réparties dans la direction circonférentielle et saillantes sur la partie du cylindre (3) de façon radiale en direction de l'anneau (7) et/ou sur l'anneau d'étanchéité (7) de façon radiale en direction de la partie du cylindre (9) sont prévues et en ce que l'anneau d'étanchéité (7) ainsi que la partie du cylindre (3) ne se touchent que dans la zone des nervures (13).
  2. Joint de tige de soupape selon la revendication 1, caractérisé en ce que les nervures (13) sont réparties uniformément dans la direction circonférentielle.
  3. Joint de tige de soupape selon les revendications 1 à 2, caractérisé en ce que les nervures (13) ont un profil triangulaire diminuant de la base vers la pointe.
  4. Joint de tige de soupape selon les revendications 1 à 3, caractérisé en ce que la hauteur des nervures (13), mesurée en sens radial, est de quelques centièmes de millimètre supérieure à la différence entre le demi diamètre intérieur de la partie du cylindre et le demi diamètre extérieur du joint d'étanchéité.
  5. Joint de tige de soupape selon les revendications 1 à 4, caractérisé en ce que la partie du cylindre (3) est limitée, à l'extrémité opposée à la première bride (2), par une seconde bride (4) saillante de façon radiale vers l'intérieur.
  6. Joint de tige de soupape selon la revendication 5, caractérisé en ce que la partie du cylindre (3) et la seconde bride (4) dépassent en direction axiale de l'anneau d'étanchéité (7) et de la lèvre d'étanchéité (8) sur toute leur longueur et en ce que la lèvre d'étanchéité (8) est déplaçable librement en direction radiale.
  7. Joint de tige de soupape selon les revendications 1 à 6, caractérisé en ce que l'anneau d'étanchéité (7) est constitué d'un anneau de renfort (11) et d'un élément d'étanchéité élastique.
  8. Joint de tige de soupape selon la revendication 7, caractérisé en ce que l'élément d'étanchéité comprend au moins une lèvre d'étanchéité (8) pouvant être enclenchée avec la tige de la soupape et au moins une nervure d'étanchéité pouvant être enclenchée avec le guide de la soupape qui se fondent l'une dans l'autre.
EP19940107573 1993-07-20 1994-05-17 Joint de tige de soupape Expired - Lifetime EP0639695B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9308898A FR2708037B1 (fr) 1993-07-20 1993-07-20 Joint de tige de soupape.
FR9308898 1993-07-20

Publications (2)

Publication Number Publication Date
EP0639695A1 EP0639695A1 (fr) 1995-02-22
EP0639695B1 true EP0639695B1 (fr) 1996-07-24

Family

ID=9449414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940107573 Expired - Lifetime EP0639695B1 (fr) 1993-07-20 1994-05-17 Joint de tige de soupape

Country Status (4)

Country Link
EP (1) EP0639695B1 (fr)
DE (1) DE59400451D1 (fr)
ES (1) ES2091067T3 (fr)
FR (1) FR2708037B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1276427B1 (it) * 1995-06-21 1997-10-31 Corcos Ind Spa Guarnizione di tenuta per una valvola di un motore a combustione interna.
DE19945348C2 (de) * 1999-09-22 2003-07-10 Freudenberg Carl Kg Dichtung für hin- und hergehende Maschinenteile

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902518A1 (de) * 1989-01-28 1990-08-02 Goetze Ag Ventilschaftabdichtung
US5174256A (en) * 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal

Also Published As

Publication number Publication date
ES2091067T3 (es) 1996-10-16
FR2708037A1 (fr) 1995-01-27
DE59400451D1 (de) 1996-08-29
FR2708037B1 (fr) 1995-09-01
EP0639695A1 (fr) 1995-02-22

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