EP2236776A1 - Ventilschaftdichtung - Google Patents

Ventilschaftdichtung Download PDF

Info

Publication number
EP2236776A1
EP2236776A1 EP10002787A EP10002787A EP2236776A1 EP 2236776 A1 EP2236776 A1 EP 2236776A1 EP 10002787 A EP10002787 A EP 10002787A EP 10002787 A EP10002787 A EP 10002787A EP 2236776 A1 EP2236776 A1 EP 2236776A1
Authority
EP
European Patent Office
Prior art keywords
valve
mounting ring
valve stem
ring
seal
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
EP10002787A
Other languages
German (de)
English (en)
Other versions
EP2236776B1 (fr
Inventor
Mitsugu Kobayashi
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 EP2236776A1 publication Critical patent/EP2236776A1/fr
Application granted granted Critical
Publication of EP2236776B1 publication Critical patent/EP2236776B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements

Definitions

  • the present invention relates to a valve stem seal capable of sealing a valve stem of an intake/exhaust valve of an internal combustion engine and a valve guide supporting the valve stem in an axially movable manner.
  • Fig. 5 is a half cross-sectional view illustrating a valve of an internal combustion engine which is provided with a valve stem seal of a related art
  • Fig. 6 is a half cross-sectional view illustrating the mounted state of a valve stem seal of a related art.
  • reference numeral 101 denotes a cylinder head
  • reference numeral 102 denotes an exhaust port formed in the cylinder head 101
  • reference numeral 103 denotes a valve for opening and closing an intake port (or exhaust port) 102
  • reference numeral 104 denotes a valve stem extending from the valve 103
  • reference numeral 105 denotes a valve guide penetrating the cylinder head 101 and supporting the valve stem 104 in an axially movable manner
  • reference numeral 106 denotes a valve spring for biasing the valve 103 in a valve closing direction via the valve stem 144
  • reference numeral 107 denotes a cam bringing into contact with a lifter 108 installed at an upper end of the valve stem 104 and pushing the valve 103 in a valve opening direction against a biasing force of the valve spring 106 whenever the cam is rotated once by a camshaft 107a.
  • a valve stem seal 110 is mounted on the valve guide 105.
  • valve stem seal 110 includes, as shown in Fig. 6 , a valve guide seal portion 111 brought into close contact with an upper outer peripheral surface of the valve guide 105, a seal lip 112 extending from an upper end of the valve guide seal portion and slidably brought into close contact with the outer peripheral surface of the valve stem 104, and a mount ring 113 of a metal material buried in the valve guide seal portion 111.
  • the valve stem seal prevents engine oil in an oil chamber O formed in an upper portion of the valve guide 105 from leaking from a gap G between the valve stem 104 and the valve guide 105.
  • a flange 113a is installed at one end of the mounting ring 113 and abuts against the cylinder head 101.
  • the flange 113a installed at the mounting ring 113 serves as a base receiving a load of the valve spring 106 and fixing the valve stem seal 110 by using the load of the valve spring 106. That is, by a pressing force of the valve spring 106 toward the flange 113a, it is possible to prevent movement or detachment of the valve stem seal 110 from the valve guide 105 in a release direction due to the pressure which is applied to a space S behind the seal lip 112 via the gap G between the valve stem 104 and the valve guide 105 from a combustion chamber in the cylinder.
  • a valve stem seal having the configuration similar to that in Fig. 6 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-249200 and Japanese Patent Application Laid-Open No. 09-177522 .
  • an object of the invention is to provide a valve stem seal of a configuration which does result in fabrication problems and increases the mechanical strength thereof so as to cope with a higher power internal combustion engine.
  • the valve stem seal of the invention includes a mounting ring arranged so as to surround the outer periphery of a tubular valve guide protruding from a cylinder head; a seal lip integrally provided at one end of the mounting ring and slidably brought into close contact with the outer peripheral surface of a valve stem which is inserted through the valve guide and biased in the axial direction by a valve spring; and a spring receiving ring arranged at the outer periphery of the mounting ring and pushed against the cylinder head by the valve spring, wherein the spring receiving ring has rigidity higher than the mounting ring, and has an internal diameter portion locked to a locking groove formed at the outer peripheral surface of the mounting ring, and a groove shoulder of the locking groove on the side of the seal lip is formed with a deformable projecting portion having a diameter larger than the internal diameter of the mounting ring and permitting the internal diameter portion of the spring receiving ring to axially pass therethrough.
  • the projecting portion is easily deformed by the interference of the internal diameter portion of the spring receiving ring in a process of inserting the spring receiving ring onto the mounting ring from the end of the seal lip side, thereby permitting the internal diameter portion to pass through the locking groove side. After the spring receiving ring is locked to the locking groove, the axial movement of the spring receiving ring is restricted.
  • valve stem seal according to claim 2 a plurality of the projecting portions is formed at predetermined intervals in a peripheral direction in the configuration according to claim 1.
  • the spring receiving ring is fabricated of a material different from the mounting ring, the spring receiving ring can have strength higher than that of the mounting ring. For this reason, durability of the spring receiving ring can be increased against the load from the valve spring, and it is possible to easily assemble the spring receiving ring to the locking groove of the mounting ring.
  • valve stem seal according to claim 2 in addition to the effect obtained by the invention of claim 1, the assembly of the spring receiving ring can be further easily performed.
  • reference numeral 1 denotes a valve stem seal according to the invention
  • reference numeral 2 denotes a cylinder head of an internal combustion engine
  • reference numeral 3 denotes a valve guide penetrating the cylinder head 2 made of a cylindrical sintered metal and having an upper portion protruding from the cylinder head 2
  • reference numeral 4 denotes a valve stem inserted into the valve guide 3 and having a valve (not shown) formed at a lower end thereof
  • 5 denotes a valve spring for biasing the valve (valve stem 4) in a valve closing direction (upward side on the figure) with respect to an axial direction via the valve stem 4.
  • the valve stem seal 1 includes a mounting ring 11 arranged so as to surround the outer periphery of the valve guide 3 protruding from the cylinder head 2, a seal lip 12 integrally provided at one end of the mounting ring 11 and slidably brought into close contact with the outer peripheral surface of the valve stem 4, a valve guide seal portion 13 installed on the inter peripheral surface of the mounting ring 11 and brought into close contact with the outer peripheral surface of the valve guide 3, a spring receiving ring 14 locked to the outer periphery of the end of the cylinder head 2 side in the mounting ring 11 and pushed against the cylinder head 2 side by the valve spring 5, and a garter spring 15 mounted onto the outer periphery of the seal lip 12.
  • the seal lip 12 and the valve guide seal portion 13 are formed in succession, and are integrally formed with the mounting ring 11 of a metal material by a rubber-type elastic material (e.g., rubber material or synthetic resin material having rubber-like elasticity).
  • the mounting ring 11 is fabricated by plastic working such as press forming of metal.
  • the mounting ring has an axial length longer than a projecting distance of the valve guide 3 from the cylinder head 2.
  • the mounting ring 11 has a body portion 11 a and an inward flange portion 11 b bent and formed at an upper end of the body portion.
  • the outer peripheral surface of the mounting ring is provided with a locking groove 11c at a lower end thereof, and the locking groove extends in the peripheral direction.
  • the groove shoulder opposite to the seal lip 12 is constituted of an outward flange portion 11 d bent and formed at an end of the cylinder head 2 side of the mounting ring 11.
  • the groove shoulder of the seal lip 12 side is constituted of a projecting portion 11e.
  • the seal lip 12 is integrally cure-adhered to the inward flange portion 11b so that a base portion thereof encloses the inward flange portion 11b of the mounting ring 11.
  • the seal lip extends therefrom in an upward direction, so that the internal diameter portion in the vicinity of a distal end (upper end) is slidably brought into close contact with the outer peripheral surface of the valve stem 4 protruding from the upper end opening of the valve guide 3.
  • valve guide seal portion 13 is integrally cure-adhered to the inner peripheral surface of the body portion 11 a of the mounting ring 11, and is provided with a plurality of seal bosses 13a in a peripheral direction at regular intervals.
  • the plurality of seal bosses 13a are brought into close contact with the outer peripheral surface of the valve guide 3 with appropriate tolerance for interference.
  • the spring receiving ring 14 is formed in a washer shape by a hard metal material having rigidity higher than the mounting ring 11.
  • the internal diameter portion of the spring receiving ring is provided with projecting portions 14a to be locked and stepped concave portions 14b beneath the projecting portions 14a at regular intervals in a peripheral direction.
  • the projecting portion 14a to be locked is locked to the locking groove 11c of the mounting ring 11, and the outward flange portion 11d of the mounting ring 11 is loose-fitted into the stepped concave portion 14b.
  • the portion of the mounting ring 11 which extends from the projecting portion 11e to the outward flange portion 11d is separated in a peripheral direction by a plurality of slits 11f, as shown in Fig. 2 .
  • the mounting ring 11 has an appropriate spring property.
  • Each of the projecting portions 11e has an external diameter slightly larger than an internal diameter of the projecting portion 14a to be locked of the spring receiving ring 14, and a surface facing a side (seal lip 12 side) opposite to the locking groove 11c is formed in a gentle inclined surface 11g.
  • the external diameter portion of the projecting portion 11e is formed to be elastically deformed so that it permits the internal diameter portion of the projecting portion 14a to be locked to pass therethrough in an axial direction under a relatively small axial load.
  • the garter spring 15 is formed by connecting coil springs of metal in a circular form, and, as shown in Fig. 2 , is removably fitted in the circular groove 12a formed on the outer peripheral surface in the vicinity of the distal end (upper end) in the seal lip 12 to compensate a fastening force of the seal lip 12 with respect to the outer peripheral surface of the valve stem 4.
  • the mounting ring 11 integrally formed with the seal lip 12 and the valve guide seal portion 13 is assembled with the spring receiving ring 14 which is made as a member different from the mounting ring.
  • the portion of the mounting ring extending from the projecting portion 11e to the outward flange portion 11d is separated in a peripheral direction by the plurality of slits 11f, the portion is easily deformed in an internal diameter side by the relative mounting of the projecting portion 14a to be locked onto the inclined surface 11g due to the pressing load applied to the spring receiving ring 14 in an insertion direction, thereby permitting the projecting portion 14a to be locked to pass therethrough toward the locking groove 11c. Accordingly, as shown in Fig. 4 , the spring receiving ring 14 is locked to the locking groove 11c of the mounting ring 11 even by a relatively light force.
  • valve stem seal 1 having the above configuration suppresses leakage of engine oil from an oil chamber of the upper portion of the cylinder head 2 via the gap G between the outer peripheral surface of the valve stem 4 and the inner peripheral surface of the valve guide 3.
  • the spring receiving ring 14 is fabricated differently from the mounting ring 11 which is formed by plastic working, the spring receiving ring 14 can be made of a material having strength higher than that of the mounting ring 11. For this reason, it is possible to sufficiently increase the mechanical strength of the spring receiving ring 14 against the load of the valve spring 5 and the load of a release direction due to the pressure applied to the space S behind the seal lip 12 via the gap G between the valve stem 4 and the valve guide 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
EP10002787A 2009-03-17 2010-03-17 Ventilschaftdichtung Not-in-force EP2236776B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009063971A JP2010216567A (ja) 2009-03-17 2009-03-17 バルブステムシール

Publications (2)

Publication Number Publication Date
EP2236776A1 true EP2236776A1 (fr) 2010-10-06
EP2236776B1 EP2236776B1 (fr) 2011-10-26

Family

ID=42122789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10002787A Not-in-force EP2236776B1 (fr) 2009-03-17 2010-03-17 Ventilschaftdichtung

Country Status (3)

Country Link
EP (1) EP2236776B1 (fr)
JP (1) JP2010216567A (fr)
AT (1) ATE530739T1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130894A1 (it) * 2013-11-04 2015-05-05 Corcos Ind S A S Di Extern A Italia S R L Guarnizione per una valvola di un motore a combustione interna
EP3236117A1 (fr) * 2016-04-19 2017-10-25 Freudenberg Sealing Technologies S.A.S Di Externa Italia S.R.L.U Joint d'une soupape dans un moteur à combustion interne
CN113710879A (zh) * 2019-05-13 2021-11-26 Nok株式会社 阀杆密封件

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230313713A1 (en) * 2022-04-05 2023-10-05 GM Global Technology Operations LLC Engine valve assembly including detent mechanism configured to increase force biasing valve toward closed position when valve is at or near closed position

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380770A1 (fr) 1989-01-28 1990-08-08 Goetze Ag Joint d'étanchéité pour tige de soupape
US5174256A (en) 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal
JP2003343734A (ja) 2002-05-24 2003-12-03 Nok Corp 密封装置
JP2004176881A (ja) 2002-11-29 2004-06-24 Nok Corp 密封装置
US20050040603A1 (en) 2003-08-21 2005-02-24 Leimer Mark A. Valve stem seal assembly with changeable cap
JP2005249200A (ja) * 2004-02-25 2005-09-15 Freudenberg-Nok General Partnership ツーピース弁軸シール

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380770A1 (fr) 1989-01-28 1990-08-08 Goetze Ag Joint d'étanchéité pour tige de soupape
US5174256A (en) 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal
JP2003343734A (ja) 2002-05-24 2003-12-03 Nok Corp 密封装置
JP2004176881A (ja) 2002-11-29 2004-06-24 Nok Corp 密封装置
US20050040603A1 (en) 2003-08-21 2005-02-24 Leimer Mark A. Valve stem seal assembly with changeable cap
JP2005249200A (ja) * 2004-02-25 2005-09-15 Freudenberg-Nok General Partnership ツーピース弁軸シール

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130894A1 (it) * 2013-11-04 2015-05-05 Corcos Ind S A S Di Extern A Italia S R L Guarnizione per una valvola di un motore a combustione interna
EP2868875A1 (fr) * 2013-11-04 2015-05-06 CORCOS INDUSTRIALE S.a.s. di Externa Italia S.r.l. Joint d'une soupape dans un moteur à combustion interne
CN104612851A (zh) * 2013-11-04 2015-05-13 科尔科斯意大利埃克斯特纳工业有限合伙公司 一种用于内燃机的阀的衬垫
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
CN104612851B (zh) * 2013-11-04 2018-10-16 科德宝密封技术意大利埃克斯特纳有限合伙公司 一种用于内燃机的阀的衬垫
EP3236117A1 (fr) * 2016-04-19 2017-10-25 Freudenberg Sealing Technologies S.A.S Di Externa Italia S.R.L.U Joint d'une soupape dans un moteur à combustion interne
CN107304691A (zh) * 2016-04-19 2017-10-31 科德宝密封技术意大利埃克斯特纳有限合伙公司 用于内燃机的气门的衬垫
US10167748B2 (en) 2016-04-19 2019-01-01 Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. Gasket for a valve of an internal combustion engine
CN113710879A (zh) * 2019-05-13 2021-11-26 Nok株式会社 阀杆密封件

Also Published As

Publication number Publication date
ATE530739T1 (de) 2011-11-15
EP2236776B1 (fr) 2011-10-26
JP2010216567A (ja) 2010-09-30

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