EP1338762B1 - Ventilschaftabdichtung an Verbrennungskraftmaschinen - Google Patents

Ventilschaftabdichtung an Verbrennungskraftmaschinen Download PDF

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Publication number
EP1338762B1
EP1338762B1 EP03002943A EP03002943A EP1338762B1 EP 1338762 B1 EP1338762 B1 EP 1338762B1 EP 03002943 A EP03002943 A EP 03002943A EP 03002943 A EP03002943 A EP 03002943A EP 1338762 B1 EP1338762 B1 EP 1338762B1
Authority
EP
European Patent Office
Prior art keywords
valve stem
valve
holding part
wall parts
stem
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
EP03002943A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1338762A2 (de
EP1338762A3 (de
Inventor
Massimo Martelli
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
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP1338762A2 publication Critical patent/EP1338762A2/de
Publication of EP1338762A3 publication Critical patent/EP1338762A3/de
Application granted granted Critical
Publication of EP1338762B1 publication Critical patent/EP1338762B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F01L2301/00—Using particular materials

Definitions

  • the invention relates to a valve stem seal on internal combustion engines with a radially on the valve stem and on the front side of the valve stem guide adjacent sealing element made of a polymeric material and the sealing element holding sleeve-shaped holding part.
  • valves on the valve to prevent oil from getting to the valve seat, on the other hand, but also enough to supply the valve stem with oil for its lubrication, so that no excessive wear on the valve stem and on the valve stem guide occurs.
  • the aim is to make the valve stem seal as cost-effective as possible while ensuring a long service life.
  • valve stem seal By the DE 199 49 248 A1 is a valve stem seal has become known, which results in a good seal with ease of manufacture. This valve stem seal can be used for various purposes.
  • valve stem seal consists of a sealing lip-bearing sleeve-shaped holding part which projects axially beyond the sealing lip and at the same time serves for fastening the seal to the valve stem guide.
  • the holding part is for this purpose pushed with its projecting sleeve portion on the lateral surface of the valve stem guide and is pressed by at least one radially inwardly notched from the central region of the sleeve portion projection in an annular groove in the lateral surface of the Ventitschaft entry.
  • the sealing lip of the valve stem seal rests against the valve stem, while an axially projecting annular sealing lip is pressed under pretension on the end face of the valve stem guide.
  • Such a valve stem seal requires a high production precision and is expensive to install.
  • the cap has a sleeve with inwardly extending indentations. The latter hold the sealing element frictionally on the valve stem guide.
  • the cylindrical cap provides a high spring stiffness, which is a hindrance in a mounting or dismounting of the cap.
  • the invention has for its object to provide a valve stem seal, which is easy to manufacture, the lowest possible Material required, gives a good seal and can be easily mounted on the valve stem guide.
  • valve stem of the type mentioned, according to the invention characterized in that the holding part in cross-section polygon-like formed on the outer wall of the valve stem guide under spring force adjacent wall parts.
  • a valve stem seal can be made with a minimum of polymeric material as well as metal. In addition, it is easy to manufacture and assemble.
  • the holding part is designed such that predetermined wall parts rest under spring pressure on the outer wall of the valve stem guide and thereby fix the seal on the valve stem guide.
  • the holding part seen in cross section has the shape of a triangle.
  • the number of applied to the outer wall of the valve stem guide wall parts can be increased. A higher number of these wall parts results in a stronger fixation of the holding part on the valve stem guide.
  • the voltage applied to the outer wall of the Ventilschaff Entry wall parts of the holding part are preferably flat, they then lie along a line contact with the valve stem guide. But it is also possible to widen the contact surface, in which the wall parts of the holding part are provided with bulges, which are adapted to the outer diameter of the valve stem guide.
  • the lying between the flat wall parts wall parts of the holding part have a cylindrical shape whose central axis coincides with the axis of the valve stem. The stability of the individual parts to each other is supported.
  • the cylindrical wall parts of the holding part can run parallel to the valve stem axis over their entire length.
  • the flat wall parts seen in cross-section have a bow-shaped portion which supports the springing of the flat wall parts.
  • the invention is thus a valve stem seal which can be fixed on the valve guide by virtue of the metal part equipped with multiple flat bendable surfaces, the metal part having n (flat) surfaces forming n-contacts with the outer diameter of the valve stem guide (n ⁇ 3) ,
  • the polygon-like holding part seen in cross-section, overcomes the axial force and vibration created by vibrations of the valve stem to avoid "pop-off” and also overpowers any positive pressure created under the sealing lip.
  • the properties of the bendable metal part allow for an increased tolerance range for the outer diameter of the valve guide, which in some cases reduces surface manufacturing requirements for valve guide outer diameter.
  • the holding part thus becomes a functional feature of the valve stem seal.
  • the dynamic range is not affected.
  • the static area is limited to a static lip on the top surface of the valve guide, reducing the amount of elastomer required.
  • FIG. 1 is the valve stem seal 1 in a view along the section line B - B of the FIG. 2 shown.
  • the holding part 2 rests with the newly formed wall parts 4 on the outer wall 5 of the valve stem guide 6 and that is given here a linear contact in the points 7.
  • the valve stem guide 6 is the valve stem 8.
  • the wall parts 4 are pressed under spring force to the outer wall 5 of the valve stem guide.
  • the flat wall parts 11, 4 of the holding part 2 are connected to each other by cylindrical wall parts 9. The central axis of these wall parts coincides with the axis 10 of the valve stem 8.
  • FIG. 2 In the FIG. 2 is the valve stem seal 1 in section along the line A - A of FIG. 1 shown.
  • the valve stem 8 is of the valve stem guide. 6 surround.
  • the holding part 2 On the valve stem guide 6, the holding part 2 is placed, which consists of flat 4 and cylindrical wall parts 9.
  • the flat wall parts 4 have the line contact 7 with the outer wall 5 of the valve stem guide 6. This line contact 7 extends only over part of the total length of the holding part 2.
  • a bow-shaped portion 11 connects, which increases the spring force of the voltage applied directly to the wall 5 part 4.
  • the sealing element 3 is provided with a valve stem 8 radially enclosing sealing lip 12.
  • This sealing lip is usually designed so that it grants a passage to a defined amount of lubricating oil, so that sufficient lubrication of the valve stem in the valve stem guide 6 is provided.
  • a second sealing lip 13 of the sealing element 3 is located statically on the valve stem guide 6, namely at its end face. For a good protection of the contact pressure of the radial lip 12, the sealing element 13 is provided with a ring clamping spring 14.
  • the sealing element 3 is held by an annular flange 15, which is arranged at the upper end of the holding part 2.
  • the holding part 2 is provided at its lower end with an outwardly directed beading edge 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP03002943A 2002-02-25 2003-02-11 Ventilschaftabdichtung an Verbrennungskraftmaschinen Expired - Lifetime EP1338762B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10207818 2002-02-25
DE10207818A DE10207818B4 (de) 2002-02-25 2002-02-25 Ventilschaftabdichtung an Verbrennungskraftmaschinen

Publications (3)

Publication Number Publication Date
EP1338762A2 EP1338762A2 (de) 2003-08-27
EP1338762A3 EP1338762A3 (de) 2006-10-18
EP1338762B1 true EP1338762B1 (de) 2008-08-20

Family

ID=27635272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03002943A Expired - Lifetime EP1338762B1 (de) 2002-02-25 2003-02-11 Ventilschaftabdichtung an Verbrennungskraftmaschinen

Country Status (7)

Country Link
US (1) US20030160394A1 (zh)
EP (1) EP1338762B1 (zh)
JP (1) JP2003254020A (zh)
CN (1) CN1255621C (zh)
AT (1) ATE405727T1 (zh)
BR (1) BR0300460A (zh)
DE (2) DE10207818B4 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209427A1 (de) 2015-05-22 2016-11-24 Aktiebolaget Skf Dichtung zum Abdichten eines Ventilschaftes, Werkzeug und Verfahren zum Montieren einer Dichtung auf ein Führungselement eines Ventilschaftes

Families Citing this family (7)

* 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
JP2008205170A (ja) * 2007-02-20 2008-09-04 Nec Lighting Ltd 発光半導体デバイス
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
US9371749B2 (en) 2012-02-08 2016-06-21 Dana Automotive Systems Group, Llc Hybrid valve stem seal retainer assembly
US8893681B2 (en) * 2013-03-07 2014-11-25 Freudenberg-Nok General Partnership Pressure support for engine valve stem seals
DE102017202585A1 (de) * 2016-02-17 2017-08-17 Mahle International Gmbh Brennkraftmaschine mit zumindest einem Zylinder und mit zumindest zwei Hohlkopfventilen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US85374A (en) * 1868-12-29 Improved screw-peg for boots and shoes
US2157866A (en) * 1935-12-24 1939-05-09 Wilkening Mfg Co Valve stem packing
US3554180A (en) * 1969-03-21 1971-01-12 Gen Motors Corp Valve stem seal
DE3222356C2 (de) * 1981-09-18 1984-09-13 Goetze Ag, 5093 Burscheid Ventilschaftabdichtung für Brennkraftmaschinen
US4822061A (en) * 1987-10-02 1989-04-18 K-Line Industries, Inc. Valve seal retainer
US5174256A (en) * 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal
DE19736321A1 (de) * 1997-08-21 1999-03-11 Cr Elastomere Gmbh Abdichtung für relativ zueinander hin- und hergehende Maschinenteile
DE19949248A1 (de) * 1999-10-13 2001-04-19 Freudenberg Carl Fa Ventilschaftabdichtung
DE10151606C1 (de) * 2001-10-18 2002-10-17 Skf Ab Ventilschaftdichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209427A1 (de) 2015-05-22 2016-11-24 Aktiebolaget Skf Dichtung zum Abdichten eines Ventilschaftes, Werkzeug und Verfahren zum Montieren einer Dichtung auf ein Führungselement eines Ventilschaftes

Also Published As

Publication number Publication date
DE50310336D1 (de) 2008-10-02
EP1338762A2 (de) 2003-08-27
EP1338762A3 (de) 2006-10-18
US20030160394A1 (en) 2003-08-28
BR0300460A (pt) 2004-08-17
CN1255621C (zh) 2006-05-10
CN1441151A (zh) 2003-09-10
ATE405727T1 (de) 2008-09-15
DE10207818B4 (de) 2006-04-06
JP2003254020A (ja) 2003-09-10
DE10207818A1 (de) 2003-09-18

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