WO2020241152A1 - 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
WO2020241152A1
WO2020241152A1 PCT/JP2020/017989 JP2020017989W WO2020241152A1 WO 2020241152 A1 WO2020241152 A1 WO 2020241152A1 JP 2020017989 W JP2020017989 W JP 2020017989W WO 2020241152 A1 WO2020241152 A1 WO 2020241152A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular portion
engaging piece
valve
valve stem
peripheral surface
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/JP2020/017989
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
一寿 平山
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 CN202080036603.0A priority Critical patent/CN113840978A/zh
Priority to US17/594,955 priority patent/US20220307601A1/en
Priority to EP20815666.1A priority patent/EP3978732A1/en
Priority to JP2021522727A priority patent/JPWO2020241152A1/ja
Publication of WO2020241152A1 publication Critical patent/WO2020241152A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • 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
    • F16J15/3268—Mounting of sealing rings
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
    • 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
    • F01L2301/00—Using particular materials
    • 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 valve stem seal.
  • the cylinder head is provided with a tubular valve guide and a valve stem that reciprocates between the cam and the cylinder by inserting the valve guide.
  • Lubricating oil is supplied from the cam side to the sliding surfaces of the valve stem and the valve guide in order to smoothly slide the valve stem and the valve guide. If the amount of lubricating oil supplied, that is, the amount of oil leaking is too large, the lubricating oil may leak to the air supply / exhaust port on the cylinder side and burn, producing white smoke. If the amount of oil leakage is too small, seizure or galling may occur between the valve stem and the valve guide.
  • a valve stem seal is provided at the cam side end of the valve guide in order to appropriately adjust the amount of oil leakage and suppress the generation of white smoke, seizure, galling, etc. as described above.
  • the valve stem seal is inserted by the valve stem and is provided so as to cover the cam side end of the valve guide.
  • the valve stem seal adjusts the amount of oil leakage by the seal lip provided on the valve stem seal.
  • Patent Document 1 has a metal ring having a tubular portion externally inserted into the valve guide, and a lip member having a seal lip held by the metal ring and in close contact with the valve stem.
  • a valve stem is provided with a notch, and a tongue-shaped engaging piece that engages with the engaging recess provided on the outer diameter surface of the valve guide in the direction of pulling out the metal ring is provided in the notch. The seal is disclosed.
  • valve stem seal as described above, since the engaging piece engages with the engaging recess of the valve guide, it is possible to prevent the valve stem seal from coming off the valve guide. A valve stem seal that can more effectively prevent the valve from coming off the valve guide is desired.
  • the problem to be solved by the present invention is to provide a valve stem seal capable of effectively suppressing disconnection from the valve guide.
  • the present invention employs the following means in order to solve the above problems. That is, the present invention is provided by being supported by the metal ring so as to be in close contact with the metal ring provided with the tubular portion attached to the outer peripheral surface of the end portion of the valve guide and the valve stem through which the valve guide is inserted.
  • a lip member including a seal lip is provided, and a notch is provided in the tubular portion, and the notch is provided so as to project into the notch toward an engagement recess provided on the outer peripheral surface of the valve guide, and the engagement is performed.
  • a valve stem seal provided with a tongue-shaped engaging piece that engages with the recess in the direction of removal of the metal ring from the valve guide, wherein the engaging piece is of the engaging piece.
  • the portion extending from the start end by the first length in the pull-out direction is bent inward in the radial direction of the tubular portion, and the first length is from the bent portion to the tip of the engaging piece.
  • a valve stem seal formed so as to be longer than the second length of the tubular portion in the axial direction.
  • the valve stem seal as described above includes an extension support portion, which is a portion in which the engaging piece extends in the pull-out direction of the metal ring from the starting end to the portion bent inward in the radial direction of the tubular portion. It is configured to have an engaging portion that is a portion from the bent portion to the tip.
  • the engaging portion of the engaging piece is formed by the outer peripheral surface of the valve guide at the stage of attachment before the engaging piece engages with the engaging recess. It is pressed outward in the radial direction of the tubular part, and largely moves outward in the radial direction from the original position. Along with this, the tip of the extension support portion, which is the start end of the engaging portion, also moves significantly outward in the radial direction, so that the extension support portion is deformed at the start end and rotates outward in the radial direction around the start end. Moving.
  • the first length which is the length of the extension support portion, that is, the radius of gyration in the rotational movement
  • the second length which is the length of the engaging portion in the axial direction of the tubular portion.
  • the present invention is provided by being supported by the metal ring so as to be in close contact with the metal ring provided with the tubular portion attached to the outer peripheral surface of the end portion of the valve guide and the valve stem through which the valve guide is inserted.
  • a lip member including a seal lip, and a notch is provided in the tubular portion, and the notch is provided so as to project into the notch toward an engagement recess provided on the outer peripheral surface of the valve guide, and the engagement is performed.
  • a valve stem seal provided with a tongue-shaped engaging piece that engages with the recess in the direction in which the metal ring is pulled out from the valve guide, and the tubular portion is the first tubular portion.
  • a second tubular portion are provided, and the inner peripheral surface of the first tubular portion is attached so as to be close to or in contact with the outer peripheral surface of the valve guide, and the inner peripheral surface of the second tubular portion is attached.
  • the first tubular portion is provided so as to be separated from the axis of the tubular portion by the inner peripheral surface thereof, the engaging piece is provided on the second tubular portion, and the tip of the engaging piece is provided.
  • a valve stem seal provided closer to the axis than the inner peripheral surface of the first tubular portion. In the valve stem seal as described above, when the engagement piece is attached to the valve guide, the tip of the engagement piece is close to the outer peripheral surface of the valve guide at the stage of attachment before the engagement piece engages with the engagement recess.
  • the tip of the engaging piece is radially outward of the tubular portion due to the outer peripheral surface of the valve guide. It is pressed toward, and moves greatly outward in the radial direction from the original position. Along with this, the engaging piece is deformed at the starting end and rotationally moves outward in the radial direction around the starting end.
  • the tubular portion includes a first tubular portion and a second tubular portion, and the inner peripheral surface of the first tubular portion is attached so as to be close to or in contact with the outer peripheral surface of the valve guide.
  • the inner peripheral surface of the tubular portion is provided at a distance from the axis of the tubular portion with respect to the inner peripheral surface of the first tubular portion, and the engaging piece is provided on the second tubular portion. That is, the starting end of the engaging piece is provided on the second tubular portion positioned away from the outer peripheral surface of the valve guide. Therefore, the length of the engaging piece is at least inside the inner peripheral surface of the second tubular portion and the inner peripheral surface of the first tubular portion, as compared with the case where the starting end of the engaging piece is provided near the outer peripheral surface of the valve guide. The distance between the peripheral surface and the peripheral surface is longer.
  • the radius of gyration in the above-mentioned rotational movement becomes long, and the angle of rotation of the rotational movement at the start end of the engaging piece becomes small.
  • the plastic deformation in the radial direction at the start end of the engaging piece due to the rotational movement of the engaging piece during mounting is suppressed, and the engaging piece can be engaged at a deep position of the engaging recess. it can. Therefore, it is possible to provide a valve stem seal that can effectively suppress disconnection from the valve guide.
  • valve stem seal capable of effectively suppressing disconnection from the valve guide.
  • valve stem seal in the 1st Embodiment of this invention. It is explanatory drawing which showed the state at the time of attaching to the valve guide of the valve stem seal in the said 1st Embodiment. It is a partially cutaway front view of the valve stem seal in the 2nd Embodiment of this invention. It is explanatory drawing which showed the state when the valve stem seal in the 2nd Embodiment is attached to a valve guide. It is explanatory drawing of the valve stem seal in the modification of the said 2nd Embodiment.
  • FIG. 1 is a partially cutaway front view of the valve stem seal 1 according to the first embodiment.
  • the valve stem seal 1 is provided on the cylinder head 4. More specifically, the cylinder head 4 is provided with a tubular valve guide 2 so as to insert a wall portion for partitioning the cylinder side CY and the cam side CA of the cylinder head 4.
  • a valve stem 5 is provided inside the valve guide 2 so as to insert the valve guide 2.
  • the valve stem seal 1 is provided on the outer peripheral surface 2b of the end portion 2a on the cam side CA side of the valve guide 2 provided in this way so as to cover the end portion 2a.
  • the valve stem seal 1 includes a metal ring 10 formed in an annular shape and a lip member 20.
  • the metal ring 10 includes a tubular portion 11, a curved portion 12, and a flange portion 13.
  • the tubular portion 11 is formed in a substantially cylindrical shape with the axis C as the central axis.
  • the curved portion 12 has an arc at one end 11a of the tubular portion 11 in the axis C direction in the radial direction in which the tubular portion 11 is orthogonal to the axis C and is directed toward the axis C. It is provided so that it can be drawn and curved.
  • the flange portion 13 is provided substantially perpendicular to the axis C so as to extend slightly inward in the radial direction from the inner end portion 12a of the curved portion 12.
  • the metal ring 10 is formed so as to have a substantially L shape when viewed in cross section in a virtual plane including the axis C.
  • the lip member 20 is provided by being supported by the metal ring 10, and includes a seal lip 21 and a back pressure lip 22.
  • the seal lip 21 is provided so as to extend obliquely from the flange portion 13 of the metal ring 10 in the direction opposite to the tubular portion 11 in the axial direction C direction and inward in the radial direction.
  • the back pressure lip 22 extends diagonally outward from the flange portion 13 in the direction of the tubular portion 11 in the axis C direction and in the direction orthogonal to the axis C and away from the axis C. It is provided.
  • the lip member 20 is a rubber material such as fluororubber or acrylic rubber.
  • the lip member 20 is formed by vulcanization molding using a molding die.
  • the lip member 20 is adhered to the flange portion 13 by vulcanization adhesion and integrally with the metal ring 10. It is formed.
  • valve stem seal 1 is provided at the end 2a on the cam side CA side of the valve guide 2. More specifically, in the valve stem seal 1, the inner peripheral surface 11c of the tubular portion 11 and the outer peripheral surface 2b of the valve guide 2 face each other from the side opposite to the flange portion 13 of the metal ring 10 in the axis C direction.
  • the valve guide 2 is inserted into the tubular portion 11 so as to be close to or in contact with the valve guide 2 and attached to the valve guide 2. In the state where the valve stem seal 1 is attached, the tip 22a of the back pressure lip 22 is pressed against the cam side end surface 2c of the valve guide 2 and the inner end portion 21a of the seal lip 21 is pressed against the lip member 20.
  • FIG. 1 the original shape of the seal lip 21 before the valve stem seal 1 is attached is shown by a chain double-dashed line, and this portion is pressed by the outer peripheral surface 5b of the valve stem 5 and deformed.
  • the space S1 outside the valve stem seal 1 and the space S2 located inside the lip member 20 in the radial direction are partitioned.
  • an engaging recess 3 is formed in the metal ring 10, and an engaging piece 15 is provided in the tubular portion 11 of the metal ring 10 correspondingly. More specifically, a notch 14 is provided in the tubular portion 11, and a tongue piece-shaped engaging piece 15 is provided in the notch 14 so as to project toward the engaging recess 3 of the valve guide 2. Has been done.
  • the notch 14 includes an end edge portion 14a and two side edge portions 14b that are continuous with each other.
  • the end side portion 14a is formed so as to extend in the circumferential direction of the tubular portion 11 in a plane orthogonal to the axis C.
  • the side side portion 14b is formed so as to extend substantially parallel to the axis C so as to extend from both ends of the end side portion 14a toward the side opposite to the flange portion 13.
  • the notch 14 is formed in a substantially U shape, and the notch 14 is formed except for the portion between the two bottom portions 14c, which is the end portion opposite to the end side portion 14a of each side side portion 14b.
  • the inner portion of 14 is separated from the outer portion. In this way, the engaging piece 15 is formed by separating the inner portion of the notch 14.
  • Such a notch 14 can be formed by punching with a press machine.
  • the engaging piece 15 is formed as a part of the tubular portion 11 so as to be continuous with the outside of the notch 14 by the starting end 15a which is a portion between the two bottom portions 14c.
  • the engaging piece 15 is formed in the shape of a tongue piece so as to extend from the starting end 15a toward the flange portion 13 of the metal ring 10 in the pull-out direction D.
  • the engaging piece 15 includes an extension support portion 16 and an engaging portion 17.
  • the extension support portion 16 is provided so as to extend from the start end 15a in the pull-out direction D.
  • the engaging piece 15 is bent inward in the radial direction of the tubular portion 11 at the tip 15b in the pulling direction D of the extension support portion 16.
  • the engaging portion 17 is a portion from the bent portion 15b to the tip 15c of the engaging piece 15.
  • the length (first length) L1 of the extension support portion 16 in the axis C direction is longer than the length (second length) L2 of the engaging portion 17 in the axis C direction of the tubular portion 11.
  • the engaging piece 15 is formed.
  • a pair of the notch 14 and the engaging piece 15 are provided at positions separated by 180 degrees in the circumferential direction on the tubular portion 11. In FIG. 1, the pair of engaging pieces 15 are shown at positions separated by 90 degrees in the circumferential direction for the sake of simplicity in drawing and description.
  • the engaging recess 3 of the valve guide 2 is provided at a position corresponding to the engaging piece 15 when the valve stem seal 1 is attached to the valve guide 2.
  • the engaging recess 3 is formed by a bottom surface 3a, a rising surface 3b, and a tapered surface 3c.
  • the bottom surface 3a is provided at a position closest to the innermost axis C in the radial direction of the engaging recess 3.
  • the rising surface 3b is formed so as to rise vertically from the bottom surface 3a and vertically outward to the outer peripheral surface 2b of the valve guide 2 at the end side of the bottom surface 3a on the cam side end surface 2c side. There is.
  • the tapered surface 3c is formed so as to connect to the end surface of the bottom surface 3a opposite to the rising surface 3b at an obtuse angle with respect to the bottom surface 3a and to face the outer peripheral surface 2b of the valve guide 2.
  • the engaging recess 3 is formed in an annular shape on the outer periphery of the valve guide 2 so as to be continuous in the circumferential direction.
  • the present invention is not limited to this, and the engagement piece 15 may be partially provided discontinuously in the circumferential direction at a position corresponding to the engaging piece 15.
  • the engagement piece 15 of the valve stem seal 1 is housed in the engagement recess 3 when the valve stem seal 1 is attached to the valve guide 2.
  • a force acts so that the valve stem seal 1 is moved in the pull-out direction D.
  • the tip 15c of the engaging portion 17 comes into contact with the rising surface 3b of the engaging recess 3, so that the engaging piece 15 engages with the engaging recess 3 in the pull-out direction D, whereby the valve.
  • the stem seal 1 is prevented from coming off from the valve guide 2.
  • FIG. 2 is an explanatory view showing a state when the valve stem seal 1 is attached to the valve guide 2.
  • the valve stem seal 1 as described above covers the metal ring 10 from one end 2a of the valve guide 2 and moves the engaging piece 15 to a position where the engaging piece 15 engages with the engaging recess 3 of the valve guide 2. It is attached to the guide 2.
  • the engaging portion 17 of the engaging piece 15 is formed into a tubular portion 11 by the outer peripheral surface 2b of the valve guide 2. Is pressed outward in the radial direction in the direction shown as the direction O in FIG. 2, and largely moves outward in the radial direction from the original position.
  • the first length L1 which is the length of the extension support portion 16 is the radius in this rotational movement. Therefore, if the first length L1 is short, the rotation angle ⁇ of the extension support portion 16 at the start end 15a of the extension support portion 16 required for this rotational movement becomes large, so that the engaging piece 15 becomes large at the start end 15a.
  • the tubular portion 11 is bent outward in the radial direction and plastically deformed, resulting in shallow engagement between the engaging piece 15 and the engaging recess 3.
  • the first length L1 which is the length of the extension support portion 16, that is, the radius of gyration in the rotational movement is the engagement of the tubular portion 11 in the axis C direction. Since it is longer than the second length L2, which is the length of the portion 17, the rotation angle ⁇ of the rotational movement at the start end 15a of the engaging piece 15 is smaller than when the turning radius is shorter than the second length L2. Become. As a result, the plastic deformation of the engaging piece 15 at the starting end 15a in the radial direction due to the rotational movement of the engaging piece 15 at the time of attachment is suppressed.
  • valve stem seal 1 as described above is attached to the outer peripheral surface 2b of the end portion 2a of the valve guide 2 so as to be in close contact with the metal ring 10 having the tubular portion 11 and the valve stem 5 through which the valve guide 2 is inserted.
  • a lip member 20 having a seal lip 21 supported by the metal ring 10 is provided, a notch 14 is provided in the tubular portion 11, and a notch 14 is provided in the notch 14 and provided on the outer peripheral surface 2b of the valve guide 2.
  • a valve stem provided with a tongue-shaped engaging piece 15 that projects toward the engaged concave portion 3 and engages with the engaging concave portion 3 in the withdrawal direction D of the metal ring 10 from the valve guide 2.
  • the engaging piece 15 is bent inward in the radial direction of the tubular portion 11 at a portion extending from the starting end 15a of the engaging piece 15 in the pulling direction D by the first length L1.
  • the first length L1 is formed so as to be longer than the second length L2 in the axial direction C direction of the tubular portion 11 from the bent portion (bent portion) 15b to the tip 15c of the engaging piece 15.
  • the plastic deformation in the radial direction at the starting end 15a of the engaging piece 15 due to the rotational movement of the engaging piece 15 at the time of attachment occurs. It is suppressed and the engaging piece 15 can be engaged at a deep position of the engaging recess 3. Therefore, it is possible to provide the valve stem seal 1 capable of effectively suppressing the valve guide 2 from coming off.
  • FIG. 3 is a partially cutaway front view of the valve stem seal 41 according to the second embodiment.
  • the valve stem seal 41 is provided on the cylinder head 4. More specifically, the cylinder head 4 is provided with a tubular valve guide 2 so as to insert a wall portion for partitioning the cylinder side CY and the cam side CA of the cylinder head 4.
  • a valve stem 5 is provided inside the valve guide 2 so as to insert the valve guide 2.
  • the valve stem seal 41 is provided on the outer peripheral surface 2b of the end portion 2a on the cam side CA side of the valve guide 2 provided in this way so as to cover the end portion 2a.
  • the valve stem seal 41 includes a metal ring 50 formed in an annular shape and a lip member 20.
  • the metal ring 50 includes a tubular portion 51, a curved portion 55, and a flange portion 56.
  • the tubular portion 51 includes a first tubular portion 52 and a second tubular portion 54.
  • the first tubular portion 52 is formed in a substantially cylindrical shape with the axis C as the central axis.
  • One end 52b of the first tubular portion 52 is bent outward in the radial direction, which is a direction orthogonal to the axis C and away from the axis C, and then further bent in the radial direction outward, and then the first tubular portion 52 in the axis C direction. It is a step portion 53 that bends to the opposite side.
  • the second tubular portion 54 is provided on the side of the step portion 53 opposite to the first tubular portion 52 so as to be continuous with the step portion 53.
  • the second tubular portion 54 is formed in a substantially cylindrical shape with the same axis C as the first tubular portion 52 as the central axis.
  • the inner peripheral surface 54c of the second tubular portion 54 is provided so as to be separated from the axis C by a distance G from the inner peripheral surface 52c of the first tubular portion 52.
  • the curved portion 55 has an end portion 52a on the side opposite to the second tubular portion 54 in the axis C direction of the first tubular portion 52, and the tubular portion 51 faces the axis C orthogonal to the axis C.
  • the flange portion 56 is provided substantially perpendicular to the axis C so as to extend slightly inward in the radial direction from the inner end portion 55a of the curved portion 55.
  • the lip member 20 is provided by being supported by the metal ring 50, and includes a seal lip 21 and a back pressure lip 22.
  • the seal lip 21 is provided so as to extend obliquely from the flange portion 56 of the metal ring 50 in the direction opposite to the tubular portion 51 in the axial direction C direction and inward in the radial direction.
  • the back pressure lip 22 is provided so as to extend obliquely from the flange portion 56 in the direction of the tubular portion 51 in the axial direction C direction and outward in the radial direction.
  • the lip member 20 is a rubber material such as fluororubber or acrylic rubber.
  • the lip member 20 is formed by vulcanization molding using a molding die.
  • the lip member 20 is adhered to the flange portion 56 by vulcanization adhesion and integrally with the metal ring 50. It is formed.
  • valve stem seal 41 is provided at the end 2a on the cam side CA side of the valve guide 2. More specifically, in the valve stem seal 41, the inner peripheral surface 52c of the first tubular portion 52 and the outer peripheral surface 2b of the valve guide 2 face each other from the side opposite to the flange portion 56 of the metal ring 50 in the axis C direction.
  • the valve guide 2 is inserted into the tubular portion 51 and attached to the valve guide 2 so as to be close to or in contact with the valve guide 2. In the state where the valve stem seal 41 is attached, the tip 22a of the back pressure lip 22 is pressed against the cam side end surface 2c of the valve guide 2 and the inner end portion 21a of the seal lip 21 is pressed.
  • FIG. 3 the original shape of the seal lip 21 before the valve stem seal 41 is attached is shown by a chain double-dashed line, and this portion is deformed by being pressed against the outer peripheral surface 5b of the valve stem 5.
  • the space S1 outside the valve stem seal 41 and the space S2 located inside the lip member 20 in the radial direction are partitioned.
  • an engaging recess 3 is formed in the metal ring 50, and an engaging piece 65 is provided in the tubular portion 51 of the metal ring 50, particularly in the second tubular portion 54. More specifically, a notch 64 is provided in the second tubular portion 54, and the tongue piece-shaped engaging piece 65 is provided so as to project into the notch 64 toward the engaging recess 3 of the valve guide 2. Is provided.
  • the notch 64 includes an end side portion 64a and two side side portions 64b that are continuous with each other.
  • the end side portion 64a is formed so as to extend in the circumferential direction of the tubular portion 51 in a plane orthogonal to the axis C.
  • the side side portion 64b is formed so as to extend substantially parallel to the axis C so as to extend from both ends of the end side portion 64a toward the side opposite to the flange portion 56.
  • the notch 64 is formed in a substantially U shape, and the notch 64 is formed except for the portion between the two bottom portions 64c, which is the end portion opposite to the end side portion 64a of each side side portion 64b.
  • the inner portion of 64 is separated from the outer portion. In this way, the engaging piece 65 is formed by separating the inner portion of the notch 64.
  • Such a notch 64 can be formed by punching with a press machine.
  • the engaging piece 65 is formed as a part of the second tubular portion 54 so as to be continuous with the outside of the notch 64 by the starting end 65a which is a portion between the two bottom portions 64c.
  • the engaging piece 65 is formed in the shape of a tongue piece so as to extend from the starting end 65a toward the flange portion 56 of the metal ring 50 in the pull-out direction D.
  • the engaging piece 65 is bent inward in the radial direction of the second tubular portion 54 at a portion 65b slightly extending from the starting end 65a in the pulling direction D.
  • the engaging piece 65 is formed so that its tip 65c is provided closer to the axis C than the inner peripheral surface 52c of the first tubular portion 52.
  • a pair of the notch 64 and the engaging piece 65 are provided at positions separated by 180 degrees in the circumferential direction on the tubular portion 51.
  • the pair of engaging pieces 65 are shown at positions separated by 90 degrees in the circumferential direction for the sake of simplicity in drawing and description.
  • the engaging recess 3 of the valve guide 2 is provided at a position corresponding to the engaging piece 65 when the valve stem seal 41 is attached to the valve guide 2.
  • the engaging recess 3 is formed by a bottom surface 3a, a rising surface 3b, and a tapered surface 3c.
  • the bottom surface 3a is provided at a position closest to the innermost axis C in the radial direction of the engaging recess 3.
  • the rising surface 3b is formed so as to rise vertically from the bottom surface 3a and vertically outward to the outer peripheral surface 2b of the valve guide 2 at the end side of the bottom surface 3a on the cam side end surface 2c side. There is.
  • the tapered surface 3c is formed so as to connect to the end surface of the bottom surface 3a opposite to the rising surface 3b at an obtuse angle with respect to the bottom surface 3a and to face the outer peripheral surface 2b of the valve guide 2.
  • the engaging recess 3 is formed in an annular shape on the outer periphery of the valve guide 2 so as to be continuous in the circumferential direction.
  • the present invention is not limited to this, and the engagement piece 65 may be partially provided discontinuously in the circumferential direction at a position corresponding to the engaging piece 65.
  • the engagement piece 65 of the valve stem seal 41 is housed in the engagement recess 3 when the valve stem seal 41 is attached to the valve guide 2.
  • a force acts so that the valve stem seal 41 is moved in the pull-out direction D.
  • the tip 65c of the engaging piece 65 comes into contact with the rising surface 3b of the engaging recess 3, so that the engaging piece 65 engages with the engaging recess 3 in the pull-out direction D, whereby the valve.
  • the stem seal 41 is prevented from coming off from the valve guide 2.
  • FIG. 4 is an explanatory view showing a state of the valve stem seal 41 when it is attached to the valve guide 2.
  • the valve stem seal 41 as described above covers the metal ring 50 from one end 2a of the valve guide 2 and moves the engaging piece 65 to a position where the engaging piece 65 engages with the engaging recess 3 of the valve guide 2. It is attached to the guide 2. At the time of this attachment, at the stage during attachment before the engagement piece 65 engages with the engagement recess 3, the tip 65c of the engagement piece 65 comes close to or abuts on the outer peripheral surface 2b of the valve guide 2. Since the tip 65c of the engaging piece 65 is provided closer to the axis C of the tubular portion 51 than the inner peripheral surface 52c of the tubular portion 52, the tip 65c of the engaging piece 65 is formed by the outer peripheral surface 2b of the valve guide 2 to form the tubular portion 51.
  • the engaging piece 65 is deformed at the starting end 65a and rotationally moves outward in the radial direction about the starting end 65a in the direction R.
  • the length of the engaging piece 65 is the radius in this rotational movement. Therefore, if the length of the engaging piece 65 is short, the rotation angle ⁇ of the engaging piece 65 at the starting end 65a of the engaging piece 65 required for this rotational movement becomes large, so that the engaging piece 65 becomes a large cylinder at the starting end 65a.
  • the shape portion 51 is bent outward in the radial direction and plastically deformed, and as a result, the engagement between the engaging piece 65 and the engaging recess 3 becomes shallow.
  • the tubular portion 51 includes a first tubular portion 52 and a second tubular portion 54, and the inner peripheral surface 52c of the first tubular portion 52 is a valve.
  • the guide 2 is attached so as to be close to or in contact with the outer peripheral surface 2b, and the inner peripheral surface 54c of the second tubular portion 54 is separated from the axis C by a distance G from the inner peripheral surface 52c of the first tubular portion 52.
  • the engaging piece 65 is provided in the second tubular portion 54. That is, the starting end 65a of the engaging piece 65 is provided on the second tubular portion 54 positioned apart from the outer peripheral surface 2b of the valve guide 2.
  • the length of the engaging piece 65 is at least the inner peripheral surface 54c of the second tubular portion 54 as compared with the case where the starting end 65a of the engaging piece 65 is provided in the vicinity of the outer peripheral surface 2b of the valve guide 2.
  • the distance G of the first tubular portion 52 from the inner peripheral surface 52c is longer. Therefore, the radius of gyration in the rotational movement as described above becomes long, and the rotation angle ⁇ of the rotational movement at the start end 65a of the engaging piece 65 becomes small. As a result, the plastic deformation of the engaging piece 65 at the starting end 65a in the radial direction due to the rotational movement of the engaging piece 65 at the time of attachment is suppressed.
  • valve stem seal 41 as described above is attached to the outer peripheral surface 2b of the end portion 2a of the valve guide 2 so as to be in close contact with the metal ring 50 having the tubular portion 51 and the valve stem 5 through which the valve guide 2 is inserted.
  • a lip member 20 having a seal lip 21 supported by the metal ring 50 is provided, and a notch 64 is provided in the tubular portion 51, and is provided in the notch 64 on the outer peripheral surface 2b of the valve guide 2.
  • a valve stem provided with a tongue-shaped engaging piece 65 that protrudes toward the engaged recess 3 and engages the engaging recess 3 in the withdrawal direction D of the metal ring 50 from the valve guide 2.
  • the tubular portion 51 includes a first tubular portion 52 and a second tubular portion 54, and the inner peripheral surface 52c of the first tubular portion 52 is close to the outer peripheral surface 2b of the valve guide 2.
  • the inner peripheral surface 54c of the second tubular portion 54 is provided so as to be in contact with the inner peripheral surface 52c of the first tubular portion 52, and is provided on the radial outer side of the tubular portion 51.
  • the valve stem seal 41 is provided in the second tubular portion 54, and the tip 65c of the engaging piece 65 is located inward in the radial direction with respect to the inner peripheral surface 52c of the first tubular portion 52. I will provide a.
  • FIG. 5 is an explanatory view of the valve stem seal 71 in this modified example.
  • the valve stem seal 71 in this modification is different from the valve stem seal 41 of the second embodiment in the positions of the first tubular portion 82 and the second tubular portion 84.
  • the tubular portion 81 of the metal ring 80 of the valve stem seal 71 includes a first tubular portion 82 and a second tubular portion 84, as in the second embodiment.
  • the first tubular portion 82 is formed in a substantially cylindrical shape with the axis C as the central axis.
  • One end 82b of the first tubular portion 82 becomes a step portion 83 that bends outward in the radial direction and then further bends to the side opposite to the first tubular portion 82 in the axis C direction.
  • the second tubular portion 84 is provided on the side of the step portion 53 opposite to the first tubular portion 82 so as to be continuous with the step portion 83.
  • the second tubular portion 84 is formed in a substantially cylindrical shape with the same axis C as the first tubular portion 82 as the central axis.
  • the inner peripheral surface 84c of the second tubular portion 84 is provided so as to be separated from the axis C by a distance G from the inner peripheral surface 82c of the first tubular portion 82.
  • the second tubular portion 84 arcs inward in the radial direction at the end portion 84a on the side opposite to the first tubular portion 82 in the axis C direction of the second tubular portion 84. It is provided so as to be curved.
  • the flange portion 86 is provided substantially perpendicular to the axis C so as to extend inward in the radial direction from the inner end portion 85a of the curved portion 85. Similar to the second embodiment, the notch 94 and the engaging piece 95 are provided in the second tubular portion 84.
  • valve stem seal of the present invention is not limited to the above-described embodiments and modifications described with reference to the drawings, and various other modifications can be considered within the technical scope thereof.
  • the first tubular portion 52 and the second tubular portion 54 are configured to be connected by a step portion 53, but the present invention is not limited to this.
  • the first tubular portion may be gently widened along the axis C and connected to the second tubular portion.
  • the inner peripheral surfaces of the first tubular portion 52 and the second tubular portion 54 are formed at different positions in the radial direction, while the first tubular portion 52 is formed thicker than the second tubular portion 54.
  • the outer peripheral surface may be formed at the same position in the radial direction.
  • the valve stem seal may have a configuration in which the first embodiment and the second embodiment are combined. That is, at the same time that the valve stem seal has the configuration described in the second embodiment, the engaging piece has a tubular portion in a portion extending by a first length in the pulling direction from the start end of the engaging piece. Even if it is formed so as to bend inward in the radial direction and the first length is longer than the second length in the axial direction of the tubular portion from the bent portion to the tip of the engaging piece. Good. According to such a configuration, the action and effect as described in each of the first embodiment and the second embodiment are synergistic, and more effectively, the valve stem seal capable of effectively suppressing the disconnection from the valve guide. Can be provided.
  • Valve stem seal 2 Valve guide 2a End 2b Outer peripheral surface 3 Engagement recess 5 Valve stem 10, 50, 80 Metal ring 11, 51, 81 Cylindrical part 14, 64, 94 Notch 15, 65, 95 Engagement pieces 15a, 65a Start end 15b Bent part (bent part) 15c, 65c Tip 16 Extension support 17 Engagement 20 Lip member 21 Seal lip 22 Back pressure lip 52, 82 First tubular part 52c, 82c Inner peripheral surface of first tubular part 54, 84 Second tubular Parts 54c, 84c Inner peripheral surface of the second tubular part C Axis line D Pull-out direction L1 First length L2 Second length

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
PCT/JP2020/017989 2019-05-27 2020-04-27 バルブステムシール Ceased WO2020241152A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202080036603.0A CN113840978A (zh) 2019-05-27 2020-04-27 阀杆密封件
US17/594,955 US20220307601A1 (en) 2019-05-27 2020-04-27 Valve stem seal
EP20815666.1A EP3978732A1 (en) 2019-05-27 2020-04-27 Valve stem seal
JP2021522727A JPWO2020241152A1 (https=) 2019-05-27 2020-04-27

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019098273 2019-05-27
JP2019-098273 2019-05-27

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WO2020241152A1 true WO2020241152A1 (ja) 2020-12-03

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US (1) US20220307601A1 (https=)
EP (1) EP3978732A1 (https=)
JP (1) JPWO2020241152A1 (https=)
CN (1) CN113840978A (https=)
WO (1) WO2020241152A1 (https=)

Citations (7)

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JPS462577Y1 (https=) * 1967-09-07 1971-01-29
JPS561923Y2 (https=) * 1978-10-12 1981-01-17
US6230679B1 (en) * 1999-09-10 2001-05-15 Dana Corporation Valve stem seal with pads and tangs
JP2004176881A (ja) * 2002-11-29 2004-06-24 Nok Corp 密封装置
WO2013009479A1 (en) * 2011-07-11 2013-01-17 Dana Automotive Systems Group, Llc Eccentricity tolerant valve stem seal assembly
WO2015111505A1 (ja) * 2014-01-22 2015-07-30 Nok株式会社 バルブステムシール
JP6189168B2 (ja) 2013-10-15 2017-08-30 Nok株式会社 バルブステムシール

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Publication number Priority date Publication date Assignee Title
US5558056A (en) * 1995-11-14 1996-09-24 Freudenberg-Nok General Partnership Two-piece valve stem seal
US6764063B2 (en) * 2001-02-06 2004-07-20 Dana Corporation Valve seal assembly with bottom flange seal
US6679502B1 (en) * 2001-08-28 2004-01-20 Dana Corporation Valve stem seal assembly with valve guide retainer
US6830025B2 (en) * 2003-04-08 2004-12-14 Dana Corporation Dual spring valve stem seal module
JP6346533B2 (ja) * 2014-09-17 2018-06-20 Nok株式会社 バルブステムシール
JP3204936U (ja) * 2016-04-14 2016-06-23 Nok株式会社 バルブステムシール
JP2018071567A (ja) * 2016-10-25 2018-05-10 Nok株式会社 バルブステムシール

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS462577Y1 (https=) * 1967-09-07 1971-01-29
JPS561923Y2 (https=) * 1978-10-12 1981-01-17
US6230679B1 (en) * 1999-09-10 2001-05-15 Dana Corporation Valve stem seal with pads and tangs
JP2004176881A (ja) * 2002-11-29 2004-06-24 Nok Corp 密封装置
WO2013009479A1 (en) * 2011-07-11 2013-01-17 Dana Automotive Systems Group, Llc Eccentricity tolerant valve stem seal assembly
JP6189168B2 (ja) 2013-10-15 2017-08-30 Nok株式会社 バルブステムシール
WO2015111505A1 (ja) * 2014-01-22 2015-07-30 Nok株式会社 バルブステムシール

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US20220307601A1 (en) 2022-09-29
CN113840978A (zh) 2021-12-24
EP3978732A1 (en) 2022-04-06
JPWO2020241152A1 (https=) 2020-12-03

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