WO2021220576A1 - バルブステムシール - Google Patents

バルブステムシール Download PDF

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Publication number
WO2021220576A1
WO2021220576A1 PCT/JP2021/004719 JP2021004719W WO2021220576A1 WO 2021220576 A1 WO2021220576 A1 WO 2021220576A1 JP 2021004719 W JP2021004719 W JP 2021004719W WO 2021220576 A1 WO2021220576 A1 WO 2021220576A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve stem
inner ring
seal
stem seal
retaining
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.)
Ceased
Application number
PCT/JP2021/004719
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
昌道 稀代
宣宏 西村
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.)
Nok Corp
Original Assignee
Nok Corp
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 Nok Corp filed Critical Nok Corp
Priority to JP2022518611A priority Critical patent/JPWO2021220576A1/ja
Priority to CN202180006892.4A priority patent/CN114746678A/zh
Publication of WO2021220576A1 publication Critical patent/WO2021220576A1/ja
Anticipated expiration legal-status Critical
Ceased 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip

Definitions

  • the present invention relates to a valve stem seal.
  • valve stem seal 51 shown in FIG. 3 is known (see Patent Document 1).
  • the valve stem seal 51 includes a reinforcing ring 52 and a seal 53 made of a rubber-like elastic body held by the reinforcing ring 52.
  • valve stem seal 51 is attached to the upper end of the valve stem guide 61 in the intake / exhaust valve mechanism of the engine, and is slidably contacted with the outer peripheral surface of the valve stem 71, whereby the oil chamber O It exerts the effect of adjusting the amount of oil leakage so that the oil inside (not shown) does not leak to the port P side in large quantities.
  • Reference numeral 91 indicates a cam that moves the valve stem 71 forward and opens the valve 81.
  • Reference numeral 101 indicates a valve spring that reactivates the valve stem 71 and closes the valve 81.
  • valve stem seal 51 since the port pressure (back pressure) on the port P side acts on the valve stem seal 51, the valve stem seal 51 also has a function of stabilizing the amount of oil leakage when the port pressure is applied.
  • the engine is required to have low fuel consumption, and along with this, the port pressure tends to increase due to the miniaturization of the engine and the addition of a turbocharger.
  • valve stem seal 51 does not fall off from the valve stem guide 61.
  • An object of the present invention is to provide a valve stem seal that can prevent the valve stem seal from falling off from the valve stem guide even if a large port pressure acts on the valve stem seal.
  • the valve stem seal of the present invention includes an inner ring fixed to the valve stem guide, a seal made of a rubber-like elastic body held by the inner ring, and an outer ring arranged on the outer peripheral side of the inner ring.
  • the inner ring has a tubular portion fitted to the outer peripheral side of the valve stem guide, and a flange portion provided radially inward from the upper end of the tubular portion.
  • the outer ring is provided at the cylindrical portion, the lower end of the cylindrical portion, the spring receiving portion that receives the valve spring, and the upper end of the cylindrical portion to prevent the inner ring from falling off from the valve stem guide. It is characterized by having an inner ring retaining portion.
  • valve stem seal that can prevent the valve stem seal from falling off from the valve stem guide even if a large port pressure acts on the valve stem seal.
  • the valve stem seal 11 includes a metal inner ring 21 fixed to the valve stem guide 61 and a rubber-like elastic body seal 31 held by the inner ring 21, and further.
  • a metal outer ring 41 arranged on the outer peripheral side of the inner ring 21 is provided.
  • the inner ring 21 integrally has a tubular portion 22 fitted to the outer periphery of the upper end of the valve stem guide 61 and a flange portion 23 provided radially inward from the upper end of the tubular portion 22. There is.
  • the seal 31 is held by the flange portion 23 of the inner ring 21, and is held by the seal lip 32 that slidably contacts the outer peripheral surface of the valve stem 71 and the tubular portion 22 of the inner ring 21, and is held by the tubular portion 22 of the inner ring 21. It integrally has an inner peripheral seal portion 33 that comes into contact with the outer peripheral surface in a stationary state.
  • a garter spring 34 is fitted to the seal lip 32.
  • the inner peripheral seal portion 33 When the inner peripheral seal portion 33 is mounted, it is sandwiched between the tubular portion 22 of the inner ring 21 and the valve stem guide 61 and compressed in the radial direction. Therefore, the valve stem of the tubular portion 22 of the inner ring 21 is compressed. The fitting margin for the guide 61 is set. Therefore, the tubular portion 22 of the inner ring 21 is fitted and fixed to the valve stem guide 61 via the inner peripheral seal portion 33.
  • the seal 31 is adhered (crosslinked and adhered) to the inner ring 21, the seal 31 and the inner ring 21 are molded as an integral molded product.
  • An annular convex portion 35 is provided on the inner peripheral surface of the inner peripheral sealing portion 33 corresponding to the annular concave portion 62 provided on the outer peripheral surface of the valve stem guide 61, and the convex portion 35 is fitted into the concave portion 62 and the shaft.
  • a retaining engaging portion 36 is provided to prevent the inner ring 21 from falling off from the valve stem guide 61 by engaging in the direction.
  • the retaining engaging portion having a structure in which the convex portion 35 made of a rubber-like elastic body, which is more easily elastically deformed than metal, engages with the concave portion 62. There is a concern that the retaining effect will be insufficient if only 36 is used.
  • the outer ring 41 made of metal is arranged on the outer peripheral side of the inner ring 21 as described above.
  • the outer ring 41 has a cylindrical portion 42 arranged on the outer peripheral side of the tubular portion 22 of the inner ring 21, and one end of a valve spring 101 having a flange shape outward in the radial direction at the lower end of the cylindrical portion 42.
  • a spring receiving portion (also referred to as a spring seat) 43 for receiving the spring is integrally provided.
  • an inner ring retaining portion 44 for suppressing the inner ring 21 from falling off from the valve stem guide 61 is integrally provided at the upper end of the cylindrical portion 42, and in the present embodiment, the inner ring retaining portion 44 is integrally provided. Is provided as a flange-shaped retaining portion arranged on the retaining side (upper side) of the flange portion 23 of the inner ring 21.
  • the outer ring 41 is fixed to the cylinder head 111 by pressing the spring receiving portion 43 against the cylinder head 111 by the valve spring 101 at the time of mounting. Therefore, even if the inner ring 21 tries to fall off from the valve stem guide 61 upward, the flange portion 23 comes into contact with the inner ring retaining portion 44 and stops, so that the inner ring 21 falls off and the valve stem seal 11 falls off. It is possible to suppress it.
  • the flange portion 23 and the inner ring retaining portion 44 may already be in contact with each other in the initial state, but an axial initial gap c1 may be set between the flange portion 23 and the inner ring retaining portion 44 as shown in the figure.
  • an axial initial gap c1 may be set between the flange portion 23 and the inner ring retaining portion 44 as shown in the figure.
  • a radial clearance c2 may be set between the tubular portion 22 of the inner ring 21 and the cylindrical portion 42 of the outer ring 41 as shown in the drawing. Since the outer ring 41 does not interfere with the inner ring 21 when the outer ring 41 is retrofitted, it is possible to facilitate the retrofitting work of the outer ring 41.
  • seal 31 and the inner ring 21 are molded as an integral molded product, if there is an off-the-shelf product or a commercially available product having the same configuration, this can be used as it is.
  • the inner ring retaining portion 44 is provided as a flange-shaped retaining portion arranged on the retaining side of the flange portion 23 of the inner ring 21, but instead of this, the inner ring retaining portion is provided.
  • the stopper 44 may be provided as a tubular retainer that is fitted to the inner ring 21.
  • an inner ring retaining portion 44 for suppressing the inner ring 21 from falling off from the valve stem guide 61 is integrally provided at the upper end of the cylindrical portion 42 of the outer ring 41.
  • the inner ring retaining portion 44 is provided as a tubular retaining portion that is fitted to the outer periphery of the lower end of the tubular portion 22 of the inner ring 21.
  • this fitting is a so-called metal fitting by fitting metals to each other, and the inner ring retaining portion 44 is firmly fitted and fixed to the cylindrical portion 22 of the inner ring 21. There is. Therefore, even if the inner ring 21 tries to fall off from the valve stem guide 61 upward, the inner ring 21 is held by the inner ring retaining portion 44, so that the inner ring 21 is prevented from falling off, and the valve stem seal 11 is prevented from falling off. It is possible to do.
  • valve stem seal 11 according to the second embodiment is the same as those of the valve stem seal 11 according to the first embodiment. Therefore, the same reference numerals as those in FIG. 1 are given to FIG. 2, and the description thereof will be omitted.
  • the material of the outer ring 41 is not limited to metal and may be another material.
  • the outer ring 41 may be formed of, for example, a resin material.
  • Valve stem seal 21 Inner ring 22 Cylindrical part 23 Flange part 31 Seal 32 Seal lip 33 Inner circumference seal part 34 Gata spring 35 Convex part 36 Retaining engagement part 41 Outer ring 42 Cylindrical part 43 Spring receiving part 44 Inner ring coming off Stop 61 Valve stem guide 62 Recess 71 Valve stem 101 Valve spring 111 Cylinder head c1, c2 Clearance

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
PCT/JP2021/004719 2020-04-28 2021-02-09 バルブステムシール Ceased WO2021220576A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022518611A JPWO2021220576A1 (https=) 2020-04-28 2021-02-09
CN202180006892.4A CN114746678A (zh) 2020-04-28 2021-02-09 阀杆密封件

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-079733 2020-04-28
JP2020079733 2020-04-28

Publications (1)

Publication Number Publication Date
WO2021220576A1 true WO2021220576A1 (ja) 2021-11-04

Family

ID=78331906

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/004719 Ceased WO2021220576A1 (ja) 2020-04-28 2021-02-09 バルブステムシール

Country Status (3)

Country Link
JP (1) JPWO2021220576A1 (https=)
CN (1) CN114746678A (https=)
WO (1) WO2021220576A1 (https=)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919090A (en) * 1988-05-13 1990-04-24 Goetze Ag Mounting aid for installing valve actuating elements
JPH056109U (ja) * 1991-07-05 1993-01-29 エヌオーケー株式会社 オイルシール
JP2005249200A (ja) * 2004-02-25 2005-09-15 Freudenberg-Nok General Partnership ツーピース弁軸シール
US20100295252A1 (en) * 2009-05-20 2010-11-25 Freudenberg-Nok General Partnership Two-Piece Valve Stem Seal
JP2011033187A (ja) * 2009-07-30 2011-02-17 Freudenberg-Nok General Partnership バルブステムシール
EP3550181A1 (en) * 2018-04-04 2019-10-09 Freudenberg Sealing Technologies S.A.S Di Externa Italia S.R.L.U A gasket for a valve of an internal combustion engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010242823A (ja) * 2009-04-03 2010-10-28 Nok Corp 密封装置
JP2016223559A (ja) * 2015-06-01 2016-12-28 Nok株式会社 密封構造
JP7052237B2 (ja) * 2017-07-18 2022-04-12 中西金属工業株式会社 回転用シール
JP7034753B2 (ja) * 2018-02-19 2022-03-14 Nok株式会社 密封装置および密封構造

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919090A (en) * 1988-05-13 1990-04-24 Goetze Ag Mounting aid for installing valve actuating elements
JPH056109U (ja) * 1991-07-05 1993-01-29 エヌオーケー株式会社 オイルシール
JP2005249200A (ja) * 2004-02-25 2005-09-15 Freudenberg-Nok General Partnership ツーピース弁軸シール
US20100295252A1 (en) * 2009-05-20 2010-11-25 Freudenberg-Nok General Partnership Two-Piece Valve Stem Seal
JP2011033187A (ja) * 2009-07-30 2011-02-17 Freudenberg-Nok General Partnership バルブステムシール
EP3550181A1 (en) * 2018-04-04 2019-10-09 Freudenberg Sealing Technologies S.A.S Di Externa Italia S.R.L.U A gasket for a valve of an internal combustion engine

Also Published As

Publication number Publication date
JPWO2021220576A1 (https=) 2021-11-04
CN114746678A (zh) 2022-07-12

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