WO2020158479A1 - Joint de tige de soupape - Google Patents

Joint de tige de soupape Download PDF

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Publication number
WO2020158479A1
WO2020158479A1 PCT/JP2020/001727 JP2020001727W WO2020158479A1 WO 2020158479 A1 WO2020158479 A1 WO 2020158479A1 JP 2020001727 W JP2020001727 W JP 2020001727W WO 2020158479 A1 WO2020158479 A1 WO 2020158479A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve stem
slit
inward flange
flange portion
locking projection
Prior art date
Application number
PCT/JP2020/001727
Other languages
English (en)
Japanese (ja)
Inventor
裕 小野寺
西村　宣宏
昌道 稀代
Original Assignee
Nok株式会社
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株式会社 filed Critical Nok株式会社
Priority to JP2020528064A priority Critical patent/JP7058328B2/ja
Publication of WO2020158479A1 publication Critical patent/WO2020158479A1/fr

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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
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips

Definitions

  • the present invention relates to a valve stem seal that seals between a valve stem and a valve stem guide.
  • valve stem seal that seals between the valve stem and the valve stem guide.
  • a valve stem seal is composed of a reinforcing ring fixed to the valve stem guide and an elastic seal body provided on the reinforcing ring by integral molding or the like.
  • the seal body portion is attached to the valve stem guide
  • the reinforcing ring is attached to the valve stem guide.
  • the mounting workability is excellent, but if the back pressure is high, the valve stem seal may come off from the valve stem guide.
  • An object of the present invention is to reduce the axial length of the reinforcing ring while being excellent in workability of attaching the reinforcing ring to the valve stem guide and enabling the reinforcing ring to be stably fixed to the valve stem guide. It is to provide a valve stem seal capable of
  • the present invention adopts the following means in order to solve the above problems.
  • the valve stem seal of the present invention is in a valve stem seal that seals between a valve stem and a valve stem guide that guides the axial movement of the valve stem,
  • a reinforcing ring having a tubular portion attached to the valve stem guide, and an inward flange portion extending radially inward from the tip of the tubular portion;
  • An elastic seal body integrally provided on the reinforcing ring and slidably attached to the outer peripheral surface of the valve stem, Equipped with The cylindrical portion is provided with a locking projection that is locked in a locking recess formed in the valve stem guide,
  • the locking convex portion has a pair of side surfaces extending in parallel in the circumferential direction on the inward flange portion side and the opposite side, and a part thereof has a portion protruding inward in the radial direction. Characterize.
  • the locking convex portion provided on the tubular portion of the reinforcing ring is locked in the locking concave portion formed on the valve stem guide. Therefore, it has better workability compared to the type in which the reinforcing ring is press-fitted into the valve stem guide, and the valve stem seal may fall out of the valve stem guide compared to the type in which the seal body part is attached to the valve stem guide. Can be suppressed.
  • the locking protrusion has a pair of side surfaces extending in parallel in the circumferential direction on the inward flange portion side and the opposite side, and a part thereof has a portion protruding inward in the radial direction. Has been adopted. Therefore, the axial length of the locking protrusion can be shortened. As a result, the axial length of the reinforcing ring can be shortened.
  • the tubular portion is provided with a slit extending from the end surface on the side opposite to the inward flange portion side toward the inward flange portion side, and a slit extending in the circumferential direction from the tip thereof,
  • a side surface of the locking protrusion on the inward flange portion side is formed by a portion of the slit that extends in the circumferential direction, and a side surface of the locking protrusion on the opposite side is formed on the tubular portion. It is formed by a part of the opposite end surface, In the locking convex portion, it is preferable that a tip portion of a portion of the slit that extends toward the inward flange portion protrudes inward in the radial direction.
  • the tubular portion is provided with a pair of slit portions extending in parallel in the circumferential direction, and one end side slit portion formed so as to connect one ends of the pair of slit portions,
  • the side surface on the side of the inward flange portion of the locking protrusion is formed by one slit portion of the pair of slit portions, and the side surface on the opposite side of the locking protrusion is the pair of slit portions. Is formed by the other slit part in It is also possible to adopt a configuration in which the tip end portion of the locking convex portion on the side extending toward the one end side slit portion projects radially inward.
  • the tubular portion is provided with a pair of slits extending in parallel in the circumferential direction
  • the side surface on the inward flange portion side of the locking projection is formed by one slit in the pair of slits, and the side surface on the opposite side of the locking projection is the other side of the pair of slits. It is formed by a slit, It is also preferable that the central portion in the circumferential direction of the locking convex portion projects inward in the radial direction.
  • the cylindrical portion is provided with a slit extending in the circumferential direction
  • the side surface on the inward flange portion side of the locking projection is formed by the slit
  • the side surface on the opposite side of the locking projection is a part of the end surface on the opposite side of the tubular portion. Is formed by It is also possible to adopt a configuration in which the central portion in the circumferential direction of the locking convex portion projects inward in the radial direction.
  • the seal main body extends from the tip of the inward flange portion toward the side opposite to the tubular portion through the inward flange portion and slidably adheres to the outer peripheral surface of the valve stem. Should be provided.
  • the seal body may include a back pressure lip that extends from the tip of the inward flange portion toward the tubular portion side and slidably adheres to the outer peripheral surface of the valve stem.
  • the seal body may include a fitting portion that is fitted and fixed to the outer peripheral surface of the valve stem guide.
  • the workability of attaching the reinforcing ring to the valve stem guide is excellent, and while the reinforcing ring can be stably fixed to the valve stem guide, the axial direction of the reinforcing ring can be improved.
  • the length can be shortened.
  • FIG. 1 is a perspective view showing a state where a valve stem seal according to a first embodiment of the present invention is attached to a valve stem guide.
  • FIG. 2 is a partially cutaway perspective view showing a state where the valve stem seal according to the first embodiment of the present invention is attached to the valve stem guide.
  • FIG. 3 is a schematic cross-sectional view showing a state when the valve stem seal according to the first embodiment of the present invention is used.
  • FIG. 4 is a part of a front view of the reinforcing ring according to the second embodiment of the present invention.
  • FIG. 5 is a schematic sectional view of a reinforcing ring according to the second embodiment of the present invention.
  • FIG. 6 is a part of a front view of the reinforcing ring according to the third embodiment of the present invention.
  • FIG. 7 is a schematic sectional view of a reinforcing ring according to the third embodiment of the present invention.
  • FIG. 8 is a part of a front view of the reinforcing ring according to the fourth embodiment of the present invention.
  • FIG. 9 is a bottom view of the reinforcing ring according to the fourth embodiment of the present invention.
  • FIG. 1 is a perspective view showing a state where a valve stem seal according to a first embodiment of the present invention is attached to a valve stem guide.
  • FIG. 2 is a partially cutaway perspective view showing a state where the valve stem seal according to the first embodiment of the present invention is attached to the valve stem guide. Note that FIG. 2 shows a perspective view of the valve stem seal and the valve stem guide in a state in which the valve stem seal and the valve stem guide are cut along a plane including the central axis of the valve stem seal.
  • FIG. 3 is a schematic cross-sectional view showing a state when the valve stem seal according to the first embodiment of the present invention is used.
  • valve stem seal and the valve stem guide in FIG. 3 are shown in a sectional view taken along a plane including their central axes.
  • the valve stem seal according to the present embodiment has a rotationally symmetric shape except for the configuration related to the locking portion provided on the reinforcing ring described below.
  • the intake/exhaust valve mechanism is provided in a cylinder head (not shown).
  • the intake/exhaust valve mechanism includes a valve stem 300, a valve stem guide 200 that guides the axial movement of the valve stem 300, and a valve stem seal 100 that seals between the valve stem 300 and the valve stem guide 200. I have it.
  • the valve stem guide 200 is formed with a locking recess 210 for preventing the reinforcing ring 110 constituting the valve stem seal 100 from coming off from the valve stem guide 200.
  • the locking recess 210 is formed by an annular groove.
  • the side surface of the locking recess 210 on the upper side in the drawing is a surface perpendicular to the axial direction.
  • the “axial direction” means the direction in which the central axes of the valve stem seal 100 and the valve stem guide 200 extend (hereinafter the same).
  • the valve stem seal 100 includes a reinforcing ring 110 made of metal or resin, an elastic body (for example, rubber) seal body 120 integrally provided with the reinforcing ring 110, and the seal body 120 on the inner peripheral surface side.
  • the garter spring 130 presses toward.
  • the seal body 120 can be integrally provided to the reinforcement ring 110 by insert molding the seal body using the reinforcement ring 110 as an insert component.
  • the reinforcing ring 110 has a tubular portion 111 attached to the valve stem guide 200, and an inward flange portion 112 extending inward in the radial direction from the tip of the tubular portion 111.
  • the valve stem guide 200 has a substantially cylindrical shape
  • the tubular portion 111 also has a substantially cylindrical shape.
  • the reinforcing ring 110 thus configured is attached to the valve stem guide 200 by fitting the tubular portion 111 into the valve stem guide 200 from the side opposite to the inward flange 112.
  • the seal body 120 integrally includes a main lip 121, an auxiliary seal portion 122, a back pressure lip 123, and a fitting portion 124.
  • the main lip 121 extends from the tip of the inward flange portion 112 of the reinforcing ring 110 toward the side opposite to the tubular portion 111 via the inward flange portion 112, and is slidable on the outer peripheral surface of the valve stem 300. It is configured to be in close contact.
  • the back pressure lip 123 is configured to extend from the tip of the inward flange portion 112 of the reinforcing ring 110 toward the cylindrical portion 111 side and slidably adhere to the outer peripheral surface of the valve stem 300.
  • An auxiliary seal portion 122 is provided between the main lip 121 and the back pressure lip 123. Further, by mounting the garter spring 130 on the outer peripheral surface side between the main lip 121 and the auxiliary seal portion 122, the main lip 121 and the auxiliary seal portion 122 are pressed toward the inner peripheral surface side, and the valve stem. The state of being in close contact with the outer peripheral surface of 300 is maintained.
  • the fitting portion 124 is configured to be fitted and fixed to the outer peripheral surface of the valve stem guide 200. By providing the fitting portion 124, it is possible to suppress the rattling of the reinforcing ring 110 with respect to the valve stem guide 200.
  • the reinforcing ring 110 will be described in more detail.
  • the tubular portion 111 of the reinforcing ring 110 according to the present embodiment is provided with a locking projection 113 that locks into a locking recess 210 formed in the valve stem guide 200.
  • the locking projection 113 has a pair of side surfaces extending in parallel in the circumferential direction on the side of the inward flange 112 and on the side opposite thereto, and has a part of which protrudes inward in the radial direction. ing. This point will be described more specifically.
  • the cylindrical portion 111 is provided with a slit that extends from the end surface on the side opposite to the inward flange portion 112 side toward the inward flange portion 112 side and extends from the tip end thereof in the circumferential direction.
  • a portion extending toward the inward flange portion 112 side is referred to as a first slit portion 113a
  • a portion extending in the circumferential direction is referred to as a second slit portion 113b.
  • the side surface of the locking projection 113 on the inward flange portion 112 side is formed by the second slit portion 113b, and the side surface of the locking projection 113 on the side opposite to the inward flange portion 112 side is It is formed by a part of the opposite end surface of the tubular portion 111. Further, in the locking convex portion 113, the tip portion on the side of the first slit portion 113a is configured to protrude inward in the radial direction. As a result, the protruding portion enters the locking recess 210 formed in the valve stem guide 200, and is brought into a locked state.
  • the locking projection 113 is located on the upper side surface of the locking recess 210 in FIGS. 1 to 3.
  • the bumps prevent the valve stem seal 100 from coming off.
  • the locking projections 113 are provided at two locations at equal intervals in the circumferential direction.
  • the tubular portion 111 of the reinforcing ring 110 is fitted to the valve stem guide 200 from the side opposite to the inward flange portion 112.
  • the tip of the locking projection 113 gradually moves radially outward when passing through the tapered portion 220 at the tip of the valve stem guide 200.
  • the tip flexes and the tip slides on the outer peripheral surface of the valve stem guide 200.
  • the tip passes the side surface of the locking recess 210 on the upper side in FIGS. 1 to 3
  • the tip returns to its original shape by its elastic restoring force.
  • the tip of the locking projection 113 is deformed inward in the radial direction and enters the locking recess 210.
  • the back pressure increases, and even if a force acts on the reinforcing ring 110 in a direction away from the valve stem guide 200, the locking protrusion 113 abuts the side surface of the locking recess 210, and the reinforcing ring 110 Can be prevented from coming off the valve stem guide 200.
  • valve stem seal 100 According to the valve stem seal 100 according to the present embodiment, the locking projection 113 provided on the tubular portion 111 of the reinforcing ring 110 is locked to the locking recess 210 formed on the valve stem guide 200. Has been done. Therefore, it is superior in mounting workability as compared with the type in which the reinforcing ring is press-fitted into the valve stem guide. That is, the valve stem seal 100 can be attached to the valve stem guide 200 without any dedicated equipment. Further, it is possible to prevent the valve stem seal 100 from falling off from the valve stem guide 200 as compared with a type in which the seal main body portion is attached to the valve stem guide.
  • the locking projection 113 has a pair of side surfaces extending in parallel in the circumferential direction on the inward flange 112 side and the opposite side, and a part (tip) of the side surface projects radially inward.
  • a structure having a curved portion is adopted. Therefore, the length of the locking projection 113 in the axial direction can be reduced as compared with the case where the locking projection extending in the axial direction is adopted. Thereby, the axial length of the reinforcing ring 110 can be shortened.
  • FIGS. 4 and 5 Embodiment 2 of the present invention is shown in FIGS. 4 and 5.
  • the configuration of the locking projection is different from that of the first embodiment. Since other configurations and operations are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.
  • FIG. 4 is a part of a front view of the reinforcing ring according to the second embodiment of the present invention.
  • FIG. 5 is a schematic sectional view of a reinforcing ring according to the second embodiment of the present invention. 5 is a cross-sectional view taken along the line AA in FIG.
  • the valve stem seal according to this embodiment is different from that of the first embodiment only in the structure of the reinforcing ring 110X, and the other structures may be the same as those described in the first embodiment. The description is omitted.
  • the tubular portion 111 of the reinforcing ring 110X according to the present embodiment is provided with the locking projection 114 that is locked to the locking recess 210 formed in the valve stem guide 200.
  • the locking projection 114 has a pair of side surfaces extending in parallel in the circumferential direction on the inward flange portion side and the opposite side, and a part of the side surface is radially inward. It has a part projecting toward it. This point will be described more specifically. Note that, in FIG. 4, only the end portion of the reinforcing ring 110X on the side opposite to the inward flange portion side is illustrated, and the inward flange portion is omitted.
  • the tubular portion 111 is provided with a pair of slit portions extending in parallel in the circumferential direction, and one end side slit portion 114a formed so as to connect one ends of the pair of slit portions.
  • one of the pair of slits (the slit on the inward flange side) is called the first slit 114b, and the other slit (the slit on the opposite side to the inward flange). Is referred to as a second slit portion 114c.
  • the side surface of the locking projection 114 on the inward flange portion side is formed by the first slit portion 114b, and the side surface of the locking projection 114 on the side opposite to the inward flange portion is the second slit portion. It is formed by 114c.
  • the tip end portion on the side extending toward the one end side slit portion 114a is configured to protrude inward in the radial direction.
  • the protruding portion enters the locking recess 210 formed in the valve stem guide 200, and becomes in the locked state as in the case of the first embodiment.
  • the locking projections 114 are provided at a total of two locations at equal intervals in the circumferential direction.
  • valve stem seal 100 to the valve stem guide 200 and the behavior of the locking projection 114 are the same as in the case of the above-described first embodiment, and therefore the description thereof is omitted.
  • FIGS. 6 and 7 Embodiment 3 of the present invention is shown in FIGS. 6 and 7.
  • the configuration of the locking projection is different from that of the first embodiment. Since other configurations and operations are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.
  • FIG. 6 is a part of a front view of the reinforcing ring according to the third embodiment of the present invention.
  • FIG. 7 is a schematic sectional view of a reinforcing ring according to the third embodiment of the present invention. 7 is a cross-sectional view taken along the line BB in FIG.
  • the valve stem seal according to this embodiment is different from that of the first embodiment only in the structure of the reinforcing ring 110Y, and the other structures may be the same as those described in the first embodiment. The description is omitted.
  • the tubular portion 111 of the reinforcing ring 110Y according to the present embodiment is provided with the locking projection 115 that is locked to the locking recess 210 formed in the valve stem guide 200.
  • the locking projection 115 has a pair of side surfaces extending in parallel in the circumferential direction on the inward flange portion side and the opposite side, and a part of the side surface is radially inward. It has a part projecting toward it. This point will be described more specifically.
  • FIG. 6, of the reinforcing ring 110Y only the vicinity of the end portion on the side opposite to the inward flange portion side is shown, and the inward flange portion is omitted.
  • the tubular portion 111 is provided with a pair of slits extending in parallel in the circumferential direction.
  • one of the pair of slits slit on the inward flange portion side
  • the other slit slit on the opposite side to the inward flange portion side
  • the side surface of the locking projection 115 on the inward flange portion side is formed by the first slit 115a, and the side surface of the locking projection 115 on the side opposite to the inward flange portion is formed by the second slit 115b.
  • the central portion in the circumferential direction of the locking convex portion 115 is configured to project inward in the radial direction.
  • the protruding portion enters the locking recess 210 formed in the valve stem guide 200, and becomes in the locked state as in the case of the first embodiment.
  • the locking projections 115 are provided at a total of two locations at equal intervals in the circumferential direction.
  • valve stem seal 100 to the valve stem guide 200 and the behavior of the locking projection 115 are the same as in the case of the above-described first embodiment, and a description thereof will be omitted.
  • FIGS. 8 and 9 Embodiment 4 of the present invention is shown in FIGS. 8 and 9.
  • the structure of the locking projection is different from that of the first embodiment. Since other configurations and operations are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.
  • FIG. 8 is a part of a front view of the reinforcing ring according to the fourth embodiment of the present invention.
  • FIG. 9 is a bottom view of the reinforcing ring according to the fourth embodiment of the present invention.
  • the valve stem seal according to the present embodiment is different from that of the first embodiment only in the structure of the reinforcing ring 110Z, and the other structures may be the same as those described in the first embodiment. The description is omitted.
  • the tubular portion 111 of the reinforcing ring 110Z according to the present embodiment is provided with the locking projection 116 that is locked to the locking recess 210 formed in the valve stem guide 200.
  • the locking protrusion 116 has a pair of side surfaces extending in parallel in the circumferential direction on the inward flange portion side and the opposite side, and a part of the side surface is radially inward. It has a part projecting toward it. This point will be described more specifically. Note that, in FIG. 8, only the end portion of the reinforcing ring 110Z on the side opposite to the inward flange portion side is illustrated, and the inward flange portion is omitted.
  • the cylindrical portion 111 is provided with a slit 116a extending in the circumferential direction.
  • the side surface of the locking projection 116 on the inward flange portion side is formed by the slit 116a, and the side surface of the locking projection 116 on the side opposite to the inward flange portion faces inward of the tubular portion 111. It is formed by a part of the end surface on the side opposite to the flange portion.
  • the central portion in the circumferential direction of the locking convex portion 116 is configured to project inward in the radial direction.
  • the protruding portion enters the locking recess 210 formed in the valve stem guide 200, and becomes in the locked state as in the case of the first embodiment.
  • the locking projections 116 are provided at two locations at equal intervals in the circumferential direction.
  • valve stem seal 100 to the valve stem guide 200 and the behavior of the locking projection 116 are the same as in the case of the above-described first embodiment, and therefore the description thereof is omitted.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Catching Or Destruction (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

L'invention concerne un joint de tige de soupape avec lequel un guide de tige de soupape est facilement monté sur une bague de renforcement, et la longueur axiale de la bague de renforcement peut être raccourcie tout en permettant à la bague de renforcement d'être fixée de manière stable au guide de tige de soupape.　Une partie cylindrique (111) d'une bague de renforcement (110) est pourvue d'une partie saillante de verrouillage (113) qui se verrouille avec un évidement de verrouillage (210) formé dans un guide de tige de soupape (200), et la partie saillante de verrouillage (113) est caractérisée en ce qu'elle comporte une paire de surfaces latérales qui s'étendent parallèlement à la direction circonférentielle sur le côté d'une bride intérieure (112) et du côté opposé, et comporte également une portion où une partie fait saillie diamétralement vers l'intérieur.
PCT/JP2020/001727 2019-01-29 2020-01-20 Joint de tige de soupape WO2020158479A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2020528064A JP7058328B2 (ja) 2019-01-29 2020-01-20 バルブステムシール

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-013079 2019-01-29
JP2019013079 2019-01-29

Publications (1)

Publication Number Publication Date
WO2020158479A1 true WO2020158479A1 (fr) 2020-08-06

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ID=71842389

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Application Number Title Priority Date Filing Date
PCT/JP2020/001727 WO2020158479A1 (fr) 2019-01-29 2020-01-20 Joint de tige de soupape

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JP (1) JP7058328B2 (fr)
WO (1) WO2020158479A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS44882Y1 (fr) * 1965-07-26 1969-01-16
JPS473215Y1 (fr) * 1969-03-26 1972-02-03
US6230679B1 (en) * 1999-09-10 2001-05-15 Dana Corporation Valve stem seal with pads and tangs
JP2017145909A (ja) * 2016-02-18 2017-08-24 Nok株式会社 バルブステムシール及び密封構造

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS561923Y2 (fr) * 1978-10-12 1981-01-17
JP6189168B2 (ja) * 2013-10-15 2017-08-30 Nok株式会社 バルブステムシール
JP6378569B2 (ja) 2014-07-29 2018-08-22 Nok株式会社 バルブステムシール
JP6346533B2 (ja) * 2014-09-17 2018-06-20 Nok株式会社 バルブステムシール
DE102015209427A1 (de) 2015-05-22 2016-11-24 Aktiebolaget Skf Dichtung zum Abdichten eines Ventilschaftes, Werkzeug und Verfahren zum Montieren einer Dichtung auf ein Führungselement eines Ventilschaftes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS44882Y1 (fr) * 1965-07-26 1969-01-16
JPS473215Y1 (fr) * 1969-03-26 1972-02-03
US6230679B1 (en) * 1999-09-10 2001-05-15 Dana Corporation Valve stem seal with pads and tangs
JP2017145909A (ja) * 2016-02-18 2017-08-24 Nok株式会社 バルブステムシール及び密封構造

Also Published As

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JP7058328B2 (ja) 2022-04-21
JPWO2020158479A1 (ja) 2021-02-18

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