EP1582704A1 - Ventilschaftabdichtung - Google Patents

Ventilschaftabdichtung Download PDF

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Publication number
EP1582704A1
EP1582704A1 EP04425250A EP04425250A EP1582704A1 EP 1582704 A1 EP1582704 A1 EP 1582704A1 EP 04425250 A EP04425250 A EP 04425250A EP 04425250 A EP04425250 A EP 04425250A EP 1582704 A1 EP1582704 A1 EP 1582704A1
Authority
EP
European Patent Office
Prior art keywords
guide member
seal
valve
slits
rod
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Withdrawn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
EP04425250A
Other languages
English (en)
French (fr)
Inventor
Stefano Bermond
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 SpA
Corcos Industriale di Freudenberg and Cosso 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 SpA, Corcos Industriale di Freudenberg and Cosso SRL filed Critical Corcos Industriale SpA
Priority to EP04425250A priority Critical patent/EP1582704A1/de
Publication of EP1582704A1 publication Critical patent/EP1582704A1/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Withdrawn legal-status Critical Current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 an internal combustion engine valve seal.
  • automotive internal combustion engines comprise one or more cylinders, in which the engine cycle is performed, and which define respective combustion chambers of the engine. And one of the cylinder heads has seats by which the combustion chamber communicates with pipes for feeding a mixture of unburnt fuel and air into the combustion chamber (“intake pipes”) and for expelling burnt gases from the combustion chamber (“exhaust pipes”) .
  • each valve normally comprises a guide member fixed inside a cavity in the engine; and a rod which slides in opposite directions inside a through seat defined by the guide member, and has a shutter section at one end to cut off connection between the relative intake/exhaust pipe and the combustion chamber of the cylinder.
  • valve rod projects axially from the relative guide member, and is activated by a relative control device.
  • Valves of the above type are normally fitted with seals for the lubricating oil normally circulating in the engine.
  • seals are normally fitted to the outside of the guide member, and comprise a first elastomeric portion whose inner surface cooperates with the outer surface of the top portion of the guide member; a second elastomeric portion cooperating directly with the valve rod; and a reinforcing and/or supporting member normally made of metal and supporting the above elastically deformable portions.
  • Seals of the above type are widely used on all four-stroke internal combustion engines to control lubricating oil flow from the source to the combustion chamber. Excessive lubricating oil flow, besides obviously wasting oil, reduces engine efficiency and impairs performance of the vehicle catalyst. On the other hand, insufficient flow produces an increase in wear and noise of the valve, accompanied by local temperature peaks, all of which may result in premature damage of the valve by the valve rod seizing inside the guide member.
  • seals provide for static sealing by means of the elastomeric portion acting on the guide member of the valve, and for dynamic sealing by means of the elastomeric portion cooperating with the rod.
  • static sealing must ensure sufficient radial compression on the guide member to prevent lubricating oil leakage, while dynamic sealing is designed to permit the minimum oil flow required to lubricate the rod-guide member connection.
  • the current state of the art poses assembly problems, due to poor assembly of the seal to the guide member, and in-service sealing problems in the presence of vibration and positive pressure generated beneath the elastomeric dynamic sealing portion.
  • a seal for a valve of an internal combustion engine said valve comprising a guide member defining a seat, and a rod sliding in said seat, and said seal comprising:
  • Number 1 in Figure 1 indicates as a whole a seal, in accordance with the present invention, for a valve 2 of a known internal combustion engine 3 shown only partly as required for a clear understanding of the present invention.
  • Figure 1 only shows a cylinder 4, of axis A, defining a combustion chamber 5; and a cylinder head 6 defining internally an intake pipe 7 for feeding air from the intake environment to chamber 5, and an exhaust pipe 7 for expelling a mixture of air and burnt gases from chamber 5 to the outside environment.
  • Pipes 7 extend symmetrically with respect to axis A, and converge, close to axis A, inside chamber 5 through two circular through openings 8 formed in cylinder head 6.
  • Cylinder head 6 extends symmetrically with respect to axis A, and defines, on the opposite side of openings 8 to chamber 5, two cylindrical through seats 9 for housing respective valves 2.
  • Valve 2 comprises a tubular guide member 10 interference-fitted inside a portion of seat 9; and a rod 11 which slides in opposite directions inside guide member 10, projects axially from opposite ends of guide member 10, and has a shutter section 12 at one end for engaging and fluidtight sealing opening 8.
  • rod 11 to shutter section 12 is activated by a control device 13 - in the example shown, a cam and tappet mechanism; and rod 11 is loaded in known manner towards control device 13 by a helical spring 14 housed inside seat 9.
  • seal 1 comprises a sleeve-shaped supporting member 15 fitted with an annular elastomeric member 16 axially symmetrical and coaxial with supporting member 15.
  • the elastomeric member comprises a first portion 17a which cooperates in fluidtight manner with the portion of rod 11 adjacent to the opposite end of guide member 10 to pipe 7; and a second portion 17b which cooperates in fluidtight manner with said end of guide member 10.
  • Supporting member 15 is defined by a cylindrical body 18 having, at one end, a turned-out edge 19, and, at the opposite end, an annular disk-shaped section 20 having a smaller inside diameter and extending perpendicularly to body 18.
  • Edge 19 and cylindrical body 18 of supporting member 15 are embedded inside portion 17b of elastomeric member 16, while section 20 supports in projecting manner, and is partly embedded in, portion 17a of elastomeric member 16.
  • portion 17a of elastomeric member 16 projects axially from section 20 of supporting member 15, is pressed on its inside diameter against rod 11 by an outer elastic collar 21, and cooperates with the end of guide member 10 facing it.
  • Portion 17b of elastomeric member 16 is pressed on its inside diameter against guide member 10, and is joined at one axial end to an axial end of portion 17a in a manner not shown.
  • seal 1 provides for dynamic sealing permitting passage of the minimum oil flow required to lubricate the connection between rod 11 and guide member 10.
  • seal 1 provides for static sealing ensuring sufficient radial compression on guide member 10 to prevent lubricating oil leakage.
  • An important aspect of the present invention lies in the lateral surface of supporting member 15 having a number of through slits 22 for generating radial compression forces on guide member 10.
  • slits 22 are rectangular, are equally spaced angularly, and extend coaxially with supporting member 15 from turned-out edge 19 to body 18.
  • slits 22 are alternately of a length substantially equal to the axial dimension of body 18, and a length substantially equal to half the axial dimension of body 18.
  • Slits 22 generate on guide member 10, in the static sealing area, a radial compression force which assists in maintaining correct assembly.
  • slits 22 may be of lengths and directions other than those shown.
  • Slits 22 and the radial compression force exerted by supporting member 15 also enable a reduction in the amount of mix required to produce elastomeric member 16.
  • the static sealing area is reduced to the guide member 10 contact area adjacent to section 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
EP04425250A 2004-04-02 2004-04-02 Ventilschaftabdichtung Withdrawn EP1582704A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425250A EP1582704A1 (de) 2004-04-02 2004-04-02 Ventilschaftabdichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425250A EP1582704A1 (de) 2004-04-02 2004-04-02 Ventilschaftabdichtung

Publications (1)

Publication Number Publication Date
EP1582704A1 true EP1582704A1 (de) 2005-10-05

Family

ID=34878383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425250A Withdrawn EP1582704A1 (de) 2004-04-02 2004-04-02 Ventilschaftabdichtung

Country Status (1)

Country Link
EP (1) EP1582704A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017207124A (ja) * 2016-05-18 2017-11-24 株式会社ジェイテクト 車輪用軸受装置
CN112065528A (zh) * 2020-08-07 2020-12-11 浙江锋锐发动机有限公司 一种发动机气门径向调整机构、方法及配气机构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2057627A5 (de) * 1969-08-22 1971-05-21 Lechler Elring Dichtungswerke
US20030146580A1 (en) * 2002-02-01 2003-08-07 Hegemier Timothy Alan Valve seal assembly with multiple leg retainer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2057627A5 (de) * 1969-08-22 1971-05-21 Lechler Elring Dichtungswerke
US20030146580A1 (en) * 2002-02-01 2003-08-07 Hegemier Timothy Alan Valve seal assembly with multiple leg retainer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017207124A (ja) * 2016-05-18 2017-11-24 株式会社ジェイテクト 車輪用軸受装置
CN112065528A (zh) * 2020-08-07 2020-12-11 浙江锋锐发动机有限公司 一种发动机气门径向调整机构、方法及配气机构

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