EP0566059A1 - Dichtung für eine gegen Federkraft gleitende Stange, insbesondere für einen Ventilschaft einer Brennkraftmaschine - Google Patents

Dichtung für eine gegen Federkraft gleitende Stange, insbesondere für einen Ventilschaft einer Brennkraftmaschine Download PDF

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Publication number
EP0566059A1
EP0566059A1 EP93105970A EP93105970A EP0566059A1 EP 0566059 A1 EP0566059 A1 EP 0566059A1 EP 93105970 A EP93105970 A EP 93105970A EP 93105970 A EP93105970 A EP 93105970A EP 0566059 A1 EP0566059 A1 EP 0566059A1
Authority
EP
European Patent Office
Prior art keywords
supporting
stem
seal
stiffener
centering
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.)
Granted
Application number
EP93105970A
Other languages
English (en)
French (fr)
Other versions
EP0566059B1 (de
Inventor
Roberto Viazzi
Giuseppino Gambino
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.)
RFT SpA
Original Assignee
RFT 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11410035&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0566059(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by RFT SpA filed Critical RFT SpA
Publication of EP0566059A1 publication Critical patent/EP0566059A1/de
Application granted granted Critical
Publication of EP0566059B1 publication Critical patent/EP0566059B1/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

Definitions

  • the present invention relates to a seal for a rod sliding against the action of elastic means, in particular an internal combustion engine valve stem.
  • Known elastomeric seals for preventing leakage of the supply system lubricating oil into the combustion chamber of the engine substantially consist of a substantially sleeve-shaped sealing portion, and a sleeve-shaped assembly portion fitted in a seat formed externally on the valve stem guide.
  • the assembly portion normally presents a rigid metal stiffener, normally outside the co-molded assembly portion, and which provides for ensuring correct positioning of the seal.
  • the ends of the valve stem contrast springs facing the cylinder head normally rest on metal caps in turn resting directly on the cylinder head.
  • a seal for a rod sliding against the action of elastic means in particular the stem of an internal combustion engine valve; the seal comprising a substantially sleeve-shaped elastomeric element, in turn comprising a sealing portion cooperating with said stem, and an assembly portion designed to fit inside a seat on the guide element of said stem; and a stiffener formed integral with said assembly portion; characterized by the fact that said stiffener comprises a portion for supporting and centering said elastic means contrasting the movement of said stem; said supporting and centering portion extending radially and axially outwards in relation to said elastomeric element, and on the opposite side in relation to said sealing portion.
  • Number 1 in the accompanying drawings indicates a seal for a sliding rod 2, and particularly in the example shown for the stem 2 of an intake or exhaust valve 3 (shown only partially in Fig.1) of an internal combustion engine of which the cylinder head 4 is shown partially.
  • Seal 1 comprises a substantially sleeve-shaped elastomeric element 5, in turn comprising a sealing portion 6 cooperating with stem 2 of valve 3, and an assembly portion 7 designed to fit inside a substantially cylindrical seat 8 on the guide element 11 of stem 2.
  • a stiffener 12 is provided inside and formed integral with assembly portion 7.
  • Sealing portion 6 presents two inner projecting sealing lips 13 cooperating in sliding manner with the outer surface 14 of stem 2 of valve 3, for preventing oil from leaking towards cylinder head 4 and into the engine through guide element 11 of stem 2.
  • sealing portion 6 presents an outer annular pressure element, e.g. an annular spring 15, for exerting predetermined radial pressure on sealing lips 13 between which an oil collecting chamber 16 is formed.
  • an outer annular pressure element e.g. an annular spring 15
  • stiffener 12 is co-molded with elastomeric element 5, and comprises, outside element 5, a portion 21 for supporting and centering a spring 22 contrasting axial movement of stem 2 of valve 3.
  • Supporting and centering portion 21 extends radially and axially outwards in relation to elastomeric element 5, and on the opposite side in relation to sealing portion 6.
  • supporting and centering portion 21 in turn presents a first substantially flat supporting surface 23 designed to rest on a corresponding flat surface 24 of cylinder head 4; while a second surface 25, opposite surface 23, supports end 26 of contrast spring 22.
  • supporting and centering portion 21 is thus gripped between cylinder head 4 and end 26 of spring 22, and, via stiffener 12, provides for maintaining assembly portion 7 in the design position inside seat 8 and, consequently, for maintaining sealing portion 6 contacting surface 14 of stem 2.
  • supporting and centering portion 21 presents a substantially S-shaped radial section, and comprises a first portion 31 blending with stiffener 12 and projecting radially from elastomeric element 5, a second cylindrical portion 32 for centering spring 22 and substantially coaxial with sealing portion 7, and a peripheral supporting portion 33 substantially perpendicular to cylindrical centering portion 32 and having surfaces 23 and 25 on either side.
  • the portion of the seal for supporting and centering the coil spring is fixed directly to the assembly portion stiffener and co-molded directly with the elastomeric element, thus enabling the seal (which is gripped inside the seat by the spring) to be maintained in the required position, and automatic centering of the coil spring.
  • the supporting portion also provides for dispensing with the spring caps, thus enabling low-cost automated assembly of the seal, and overcoming the noise problem typically associated with spring caps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Gasket Seals (AREA)
EP93105970A 1992-04-14 1993-04-13 Dichtung für eine gegen Federkraft gleitende Stange, insbesondere für einen Ventilschaft einer Brennkraftmaschine Expired - Lifetime EP0566059B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITTO920106 1992-04-14
ITTO920106U 1992-04-14
IT000106 IT227530Y1 (it) 1992-04-14 1992-04-14 Guarnizione di tenuta per uno stelo scorrevole contro l'azione di mez- zi elastici, in particolare per uno stelo valvola di un motore a combu

Publications (2)

Publication Number Publication Date
EP0566059A1 true EP0566059A1 (de) 1993-10-20
EP0566059B1 EP0566059B1 (de) 1997-09-17

Family

ID=11410035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93105970A Expired - Lifetime EP0566059B1 (de) 1992-04-14 1993-04-13 Dichtung für eine gegen Federkraft gleitende Stange, insbesondere für einen Ventilschaft einer Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0566059B1 (de)
DE (1) DE69313907T2 (de)
ES (1) ES2106216T3 (de)
IT (1) IT227530Y1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1857645A3 (de) * 2006-05-19 2009-12-16 Carl Freudenberg KG Ventilschaftsiegel
CN103225523A (zh) * 2012-01-30 2013-07-31 通用汽车环球科技运作有限责任公司 用于高温和高压应用的发动机排气阀杆密封件
CN104358599A (zh) * 2014-11-18 2015-02-18 烟台润蚨祥油封有限公司 一种低摩擦气门油封
JP2019143684A (ja) * 2018-02-19 2019-08-29 Nok株式会社 密封装置および密封構造

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6679502B1 (en) * 2001-08-28 2004-01-20 Dana Corporation Valve stem seal assembly with valve guide retainer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1375628A (fr) * 1963-11-30 1964-10-16 Goetzewerke Dispositif de fixation pour garniture d'étanchéité de tige de soupape
GB2210956A (en) * 1987-10-14 1989-06-21 Dana Corp Unitary molded plastics valve seal
EP0459022A1 (de) * 1990-05-26 1991-12-04 Goetze Ag Ventilschaftabdichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645937B1 (fr) * 1989-04-12 1991-08-30 Peugeot Dispositif pour le guidage et l'etancheite d'une soupape

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1375628A (fr) * 1963-11-30 1964-10-16 Goetzewerke Dispositif de fixation pour garniture d'étanchéité de tige de soupape
GB2210956A (en) * 1987-10-14 1989-06-21 Dana Corp Unitary molded plastics valve seal
EP0459022A1 (de) * 1990-05-26 1991-12-04 Goetze Ag Ventilschaftabdichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 29 (M-356)(1752) 7 February 1985 & JP-A-59 173 510 ( HONDA GIKEN KOGYO KK ) 1 October 1984 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1857645A3 (de) * 2006-05-19 2009-12-16 Carl Freudenberg KG Ventilschaftsiegel
CN103225523A (zh) * 2012-01-30 2013-07-31 通用汽车环球科技运作有限责任公司 用于高温和高压应用的发动机排气阀杆密封件
CN104358599A (zh) * 2014-11-18 2015-02-18 烟台润蚨祥油封有限公司 一种低摩擦气门油封
JP2019143684A (ja) * 2018-02-19 2019-08-29 Nok株式会社 密封装置および密封構造

Also Published As

Publication number Publication date
ITTO920106V0 (it) 1992-04-14
IT227530Y1 (it) 1997-12-15
ES2106216T3 (es) 1997-11-01
DE69313907D1 (de) 1997-10-23
DE69313907T2 (de) 1998-01-29
EP0566059B1 (de) 1997-09-17
ITTO920106U1 (it) 1993-10-14

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