EP0750097A1 - Ventilschaftdichtung einer Brennkraftmaschine - Google Patents

Ventilschaftdichtung einer Brennkraftmaschine Download PDF

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Publication number
EP0750097A1
EP0750097A1 EP96109930A EP96109930A EP0750097A1 EP 0750097 A1 EP0750097 A1 EP 0750097A1 EP 96109930 A EP96109930 A EP 96109930A EP 96109930 A EP96109930 A EP 96109930A EP 0750097 A1 EP0750097 A1 EP 0750097A1
Authority
EP
European Patent Office
Prior art keywords
seal
reinforcing body
support element
valve
axis
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.)
Withdrawn
Application number
EP96109930A
Other languages
English (en)
French (fr)
Inventor
Piergiorgio Ferrero
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.)
Corcos Industriale SpA
Original Assignee
Corcos Industriale SpA
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 SpA filed Critical Corcos Industriale SpA
Publication of EP0750097A1 publication Critical patent/EP0750097A1/de
Withdrawn legal-status Critical Current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 present invention relates to a seal for a valve of an internal combustion engine.
  • the invention relates to a seal of the type comprising:
  • the sealing between the seal and the valve stem has the purpose of reducing the oil consumption of engines and pollutant emissions due to leakages of oil from the space above the valve seats towards the combustion chambers through the clearance existing between the stem of each valve and the respective guide bush.
  • the most recent generation of seals of this type have been arranged also to perform the function of a bearing plate for the biasing springs of the valves. This is achieved by the provision of a metal support element surrounding the seal and having a bearing portion with a generally plate-like shape which bears on the engine head and in turn forms a support for the end of a helical compression spring coaxial with the valve.
  • the metal reinforcing body of the sealing element is driven into the support element.
  • the object of the present invention is to provide a seal of the type specified above which can overcome the aforesaid disadvantages.
  • this object is achieved by a seal, characterized in that the metal reinforcing body is connected to the support element in a floating manner so that it can perform pivoting movements of limited amplitude about a generic axis perpendicular to the longitudinal axis of the seal.
  • the two characteristic functions of the seal that is, the sealing against the valve stem and the support of the end of the spring, are performed by two members which are kinematically free of one another. This enables the sealing lip to be positioned correctly relative to the valve stem even when there are errors in the centring of the support element relative to the axis of the valve. Consequently, any errors of perpendicularity between the surface of the engine head and the axis of the valve do not affect the sealing of the valve seals.
  • a valve, indicated 1, of an internal combustion engine for motor vehicles has a head 2 which cooperates with an intake or exhaust opening 4 of the engine.
  • the valve 1 has a stem 6 which is slidable in a bush 8 fixed in a seat 10 in the engine head 12.
  • the valve 1 is urged towards a position for the closure of the opening 4 by a helical spring 14 under compression, the ends of which act, respectively, on a plate-like member 16 fixed to the upper end of the stem 6 and on a bearing portion 18 of a metal support element 20 forming part of a seal 22.
  • the bearing portion 18 of the support element 20 has the purpose of preventing direct contact between the spring and the surface 24 of the head 12 which is generally made of a soft material (typically aluminium).
  • the valve 1 is opened, in known manner, by a rocker 26 or by a camshaft, not shown.
  • the seal 22 comprises a sealing element 28 of elastomeric material having a lip 30 which is urged against the valve stem 6 by a spring 32.
  • the sealing element 28 has a static sealing region 34 which is fitted with interference on the guide bush 8 of the valve 1.
  • the sealing element 28 is fixed to a metal reinforcing body 36 produced from a sheet of metal by drawing and blanking.
  • the reinforcing body 36 is connected to the support element 20 in a floating manner.
  • the reinforcing body 36 is restrained on the support element 20 for movements in the direction of the longitudinal axis 38 of the seal but is free to perform pivoting movements of limited amplitude about a generic axis perpendicular to the longitudinal axis 38 of the seal.
  • the reinforcing body 36 has a wall 39, for example, of cylindrical shape, which is disposed within a corresponding wall 40 of the support element 20 with a small radial clearance 42 which allows the reinforcing body 36 to perform small adjustment movements inside the outer guide wall 40.
  • the reinforcing body 36 has an annular portion 44 which projects radially from the wall 39 by a distance substantially corresponding to the radial clearance 42.
  • the radial portion 44 is constituted by a blanked edge which is inevitably formed during a blanking operation which separates the body 36 from a sheet of metal from which it is formed as a result of conventional drawing and blanking operations. The formation of the turned-over edge 44 does not therefore involve any additional cost to the production cycle.
  • the support element 20 has first and second sets of teeth 46 and 48 projecting radially inwardly on its internal surface 40.
  • the teeth 46, 48 of each set are spaced apart circumferentially and are arranged on respective circumferences 50 and 52, shown in chain line.
  • the circumferences 50 and 52 are spaced apart in the direction of the axis 38 of the seal and a retaining region 54 in which the blanked edge 44 of the reinforcing body 36 is snap-engaged is defined between them.
  • the sets of teeth 46 and 48 are preferably offset angularly relative to one another and the teeth 46 of the first set project radially less than the teeth 48 of the second set.
  • the teeth 46 and 48 are formed by the upsetting of material brought about by the insertion of a suitable tool in the direction indicated by the arrow 56.
  • Figure 5 shows schematically, in broken outline, a tool 58 suitable for forming the two sets of teeth 46 and 48.
  • the tool 58 has two sets of projecting cutters 60 and 62 which, as a result of a stroke in the direction 56, cause material to be upset at the stopping lines of the cutting edge which generates the teeth 46 and 48.
  • the different radial projection of the two sets of teeth 46 and 48 can be achieved by a different cutting stroke of the cutters 62 and 64 (which can be achieved by an axial offset of the cutters 60 and 62 as shown in Figure 5) or by different cutting depth of the cutters 60 and 62.
  • the seal is assembled by the insertion of the reinforcing body 36, on which the sealing element 28 has already been fixed, in the support element 20.
  • the reinforcing body is inserted in the direction indicated by the arrow 56 in Figure 5.
  • the blanked edge 44 of the body 36 first meets the set of teeth 46 of lesser radial thickness.
  • the thickness of the teeth 46 is set so that the blanking edge 46 can pass over them without sticking.
  • the thicker teeth 48 define the stopping position of the reinforcing body.
  • the reinforcing body 36 is restrained axially by interference with the sets of teeth 46 and 48.
  • the short axial length of the connection region between the body 36 and the element 20 enables the sealing element 28 to perform pivoting movements relative to the support element 20 under the effect of external forces.
  • the sealing lip 30 of the seal will therefore be free to be arranged in its correct working position relative to the valve stem even when the support element 20 is not centred correctly relative to the axis of the valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Gasket Seals (AREA)
EP96109930A 1995-06-21 1996-06-20 Ventilschaftdichtung einer Brennkraftmaschine Withdrawn EP0750097A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950517 1995-06-21
IT95TO000517A IT1276427B1 (it) 1995-06-21 1995-06-21 Guarnizione di tenuta per una valvola di un motore a combustione interna.

Publications (1)

Publication Number Publication Date
EP0750097A1 true EP0750097A1 (de) 1996-12-27

Family

ID=11413663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96109930A Withdrawn EP0750097A1 (de) 1995-06-21 1996-06-20 Ventilschaftdichtung einer Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0750097A1 (de)
DE (1) DE19539266C2 (de)
IT (1) IT1276427B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0877150A1 (de) * 1997-05-07 1998-11-11 Firma Carl Freudenberg Zweiteilige Ventilschaftdichtung
WO2003021085A1 (en) * 2001-08-28 2003-03-13 Dana Corporation Valve stem seal assembly with valve guide retainer
EP1568857A1 (de) * 2004-02-25 2005-08-31 Carl Freudenberg KG Zweiteilige Ventilschaftdichtung
US20150123352A1 (en) * 2013-11-04 2015-05-07 Corcos Industriale S.A.S. Di Externa Italia S.R.L. Gasket for a valve of an internal-combustion engine"
WO2017106437A1 (en) * 2015-12-15 2017-06-22 Dana Automotive Systems Group, Llc Frustoconically supported valve stem seal assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101608558B (zh) * 2008-06-18 2011-02-02 江苏林海动力机械集团公司 侧置气门内燃机用气门油封组合件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1245461A (fr) * 1959-02-05 1960-11-04 Joints d'étanchéité perfectionnés
US5174256A (en) * 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal
FR2708037A1 (fr) * 1993-07-20 1995-01-27 Procal Joint de tige de soupape.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1245461A (fr) * 1959-02-05 1960-11-04 Joints d'étanchéité perfectionnés
US5174256A (en) * 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal
FR2708037A1 (fr) * 1993-07-20 1995-01-27 Procal Joint de tige de soupape.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0877150A1 (de) * 1997-05-07 1998-11-11 Firma Carl Freudenberg Zweiteilige Ventilschaftdichtung
WO2003021085A1 (en) * 2001-08-28 2003-03-13 Dana Corporation Valve stem seal assembly with valve guide retainer
US6679502B1 (en) 2001-08-28 2004-01-20 Dana Corporation Valve stem seal assembly with valve guide retainer
EP1568857A1 (de) * 2004-02-25 2005-08-31 Carl Freudenberg KG Zweiteilige Ventilschaftdichtung
US20150123352A1 (en) * 2013-11-04 2015-05-07 Corcos Industriale S.A.S. Di Externa Italia S.R.L. Gasket for a valve of an internal-combustion engine"
US9347343B2 (en) * 2013-11-04 2016-05-24 Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. Gasket for a valve of an internal-combustion engine
WO2017106437A1 (en) * 2015-12-15 2017-06-22 Dana Automotive Systems Group, Llc Frustoconically supported valve stem seal assembly
US10513951B2 (en) 2015-12-15 2019-12-24 Dana Automotive Systems Group, Llc Frustoconically supported valve stem seal assembly

Also Published As

Publication number Publication date
ITTO950517A1 (it) 1996-12-21
DE19539266C2 (de) 1998-02-12
ITTO950517A0 (it) 1995-06-21
IT1276427B1 (it) 1997-10-31
DE19539266A1 (de) 1997-01-02

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