WO2021014842A1 - Sealed structure - Google Patents

Sealed structure Download PDF

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Publication number
WO2021014842A1
WO2021014842A1 PCT/JP2020/023980 JP2020023980W WO2021014842A1 WO 2021014842 A1 WO2021014842 A1 WO 2021014842A1 JP 2020023980 W JP2020023980 W JP 2020023980W WO 2021014842 A1 WO2021014842 A1 WO 2021014842A1
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Prior art keywords
seal lip
wall portion
end wall
seal
lip
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PCT/JP2020/023980
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French (fr)
Japanese (ja)
Inventor
直樹 萩原
琢也 天野
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Nok株式会社
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Publication of WO2021014842A1 publication Critical patent/WO2021014842A1/en

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    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering

Definitions

  • Patent Document 1 a gasket that maintains the sealing property by a pair of seal beads that are oriented in opposite directions in the axial direction regardless of the insertion direction into the mounting groove.
  • the gasket described in Patent Document 1 in which the sealing property is maintained by a pair of seal beads facing in opposite directions in the axial direction, the gasket may vary in the axial direction depending on the fixing method between the housings, the material, processing, deformation, etc. It may not be able to keep up sufficiently.
  • An object of the present invention is to provide a sealing structure that can follow the variation in the axial direction while maintaining the sealing property.
  • the sealed structure of the present invention It is a sealing device A first seal lip having a first seal lip tip and extending inward in the radial direction and in the first direction in the axial direction.
  • a second seal lip having a tip of the second seal lip and extending inward in the radial direction and extending in the second direction opposite to the first direction in the axial direction.
  • a holding ring that holds the first seal lip and the second seal lip,
  • a plurality of members that define a mounting space in which the sealing device is mounted.
  • a first member having a first end wall portion located in the first direction
  • a second member having an outer peripheral wall portion and a second end wall portion located in the second direction.
  • the first seal lip tip has a tightening margin with respect to the first end wall portion so as to press the holding ring against the second end wall portion by an axial reaction force.
  • the sealing structure of the present invention it is possible to follow the variation in the axial direction while maintaining the sealing property.
  • the plurality of members 11 and 12 have a first member 11 and a second member 12.
  • the first member 11 is a member that seals from the upper surface.
  • the first member 11 has an oil passage diameter R1.
  • the oil passage diameter R1 is the shortest distance from the central axis O to the first member 11 as shown in FIG.
  • the first member 11 has a first end wall portion 16.
  • the first end wall portion 16 has a planar shape orthogonal to the axis of the lip seal 21, and is provided on one side (upper in the figure) of the lip seal 21 in the axial direction.
  • the second member 12 is, for example, a housing or a case.
  • the second member 12 has an oil passage diameter R2.
  • the oil passage diameter R2 is the shortest distance from the central axis O to the second member 12, as shown in FIG.
  • the second member 12 has a second end wall portion 17 and an outer peripheral wall portion 18.
  • the second end wall portion 17 has a planar shape orthogonal to the axis of the lip seal 21, and is provided on the other side (lower in the figure) in the axial direction of the lip seal 21.
  • the outer peripheral wall portion 18 has a cylindrical surface shape.
  • the outer peripheral surface 21a of the lip seal 21 comes into contact with the outer peripheral wall portion 18.
  • the mounting space 14 is defined as an annular space surrounded by the first end wall portion 16, the second end wall portion 17, and the lip seal 21.
  • the lip seal 21 has a holding ring (lip holding ring, reinforcing ring) 22 and a rubber-like elastic body 23.
  • the holding ring 22 holds or reinforces the lip seal 21, and is made of a rigid material such as metal.
  • the holding ring 22 has an outer peripheral surface, an inner peripheral surface, a first end surface 22a located on one axial direction (upper side), and a second end surface 22b located on the other axial direction (lower side).
  • the rubber-like elastic body 23 may or may not be adhered to the second end face 22b, but it is preferable that the rubber-like elastic body 23 is not adhered to the second end face 22b. In this case, since the second end surface 22b directly contacts the second end wall portion 17 of the mounting space 14 to support the lip seal 21 during pressurization, the posture of the lip seal 21 is stable and the pressure resistance is increased. improves.
  • An annular seal lip (first seal lip) 27 is integrally formed on the rubber-like elastic body 23.
  • the seal lip 27 is located on the inner peripheral side of the lip seal 21 and from one end in the axial direction (upper in the figure) of the lip seal 21 toward inward in the radial direction and one in the axial direction (upper in the figure). It extends diagonally.
  • the seal lip tip (first seal lip tip) 27a comes into contact with the first end wall portion 16. That is, the axial tip portion 27b of the seal lip tip 27a comes into contact with the first end wall portion 16.
  • the seal lip tip 27a comes into contact with the first end wall portion 16 with a predetermined tightening allowance.
  • the axial reaction force generated thereby presses the holding ring 22 against the second end wall portion 17, thereby positioning the holding ring 22 in the axial direction.
  • An annular sub-seal lip (second seal lip) 28 is integrally formed on the rubber-like elastic body 23.
  • the secondary seal lip 28 is directed inward in the radial direction and from the other end in the axial direction (downward in the figure) of the lip seal 21 on the inner peripheral side of the lip seal 21 (downward in the figure). It extends diagonally.
  • the seal lip tip (second seal lip tip) 28a may be a seal portion having a protruding or bead shape.
  • an axial reaction force is generated when the sealing lip tip 27a comes into contact with the first end wall portion 16 with a predetermined tightening allowance. Since the axial reaction force presses the holding ring 22 against the second end wall portion 17, the lip seal 21 is fixed in the axial direction.
  • the outer peripheral surface 21a of the lip seal 21 of the present embodiment comes into contact with the outer peripheral wall portion 18. Therefore, the lip seal 21 can be positioned concentrically with respect to the central axis O of the mounting space 14.
  • the axial length of the lip seal 21 excluding the seal lip 27 is shorter than the distance between the first end wall portion 16 and the second end wall portion 17. Therefore, the lip seal 21 may be assembled in the mounting space 14 in a state where there is an axial variation in the mounting space 14.
  • the axial length of the lip seal 21 including the seal lip 27 of the present embodiment is longer than the distance between the first end wall portion 16 and the second end wall portion 17. Therefore, the lip seal 21 is pressed against the second end wall portion 17 by the axial reaction force. Therefore, it is possible to follow the variation in the axial direction.
  • FIG. 2 shows a cross-sectional view of a main part of a sealed structure in a sealed state according to the embodiment.
  • the lip seal 21 seals the mounting space 14.
  • the seal lip 27 is elastically deformed along the first end wall portion 16 on the first member 11 side.
  • the oil passage diameter R1 of the first member 11 is smaller than the oil passage diameter R2 of the second member 12. That is, there is a difference between the oil passage diameter R1 and the oil passage diameter R2.
  • FIG. 3 shows a cross-sectional view of a main part of a sealed structure in a sealed state in a modified example.
  • the sealed structure of the modified example has a different configuration of the first member 11 from the sealed structure of the embodiment. Other configurations are the same as in the embodiment.
  • the first member 11 of the modified example is a shaft with a flange.
  • the first member 11 has an inner peripheral wall portion connected to the first end wall portion 16.
  • the inner peripheral wall portion has a cylindrical surface shape.
  • FIG. 4 shows a cross-sectional view of a main part of a sealed structure in a sealed state in a comparative example.
  • the sealed structure of the comparative example has a different configuration of the first member 11 from the sealed structure of the embodiment. Other configurations are the same as in the embodiment.
  • the oil passage diameter R1 of the first member 11 of the comparative example is substantially the same as the oil passage diameter R2 of the second member 12. That is, there is no substantial difference between the oil passage diameter R1 and the oil passage diameter R2. In this case, when the seal lip 27 is elastically deformed along the side of the first member 11, the seal lip 21 may fall off from the mounting space 14.
  • the sealing structure described in the embodiment includes the first member 11 and the second member 12 having a difference between the oil passage diameter R1 and the oil passage diameter R2 as shown in FIG. 2, and the first member 11 as shown in FIG. Can be suitably applied when is a shaft with a flange.

Abstract

Provided is a sealed structure that can conform to variations in the axial direction when a shaft with a flange is inserted. This sealed structure comprises a sealing device 21 including a first seal lip 27 that includes a first seal lip tip 27a and that extends inward in a radial direction and in a first direction in an axial direction, a second seal lip 28 that includes a second seal lip tip 28a and that extends inward in the radial direction and in a second direction in the axial direction, and a retaining ring 22 that retains the first seal lip 27 and the second seal lip 28; a plurality of members including a first member 11 that includes a first end wall section16 positioned in the first direction, a peripheral wall portion 18, and a second member 12 that includes a second end wall section 17 positioned in the second direction. The first seal lip 27a includes a tightening allowance with respect to the first end wall section16 so that the retaining ring 22 is pressed against the second end wall section 17 by axial direction reaction force.

Description

密封構造Sealed structure
　本発明は、シール技術に係る密封構造に関する。 The present invention relates to a sealing structure according to a sealing technique.
　従来、装着溝内への挿入方向にかかわらず、軸方向背反する方向を向いた一対のシールビードによって、シール性を維持するガスケットが知られている（例えば、国際公開番号ＷＯ２０１５／１３７４９１号、以下、「特許文献１」）。 Conventionally, a gasket that maintains the sealing property by a pair of seal beads that are oriented in opposite directions in the axial direction regardless of the insertion direction into the mounting groove has been known (for example, International Publication No. WO2015 / 137491, hereinafter. , "Patent Document 1").
　特許文献１に記載の軸方向背反する方向を向いた一対のシールビードによってシール性を維持するガスケットでは、ハウジング同士の固定方法や、ハウジングの材質、加工、変形などによっては、軸方向のバラつきに十分に追随できない場合がある。
　本発明は、シール性を維持しつつ、軸方向のバラつきに追随できる密封構造を提供することを目的とする。 In the gasket described in Patent Document 1 in which the sealing property is maintained by a pair of seal beads facing in opposite directions in the axial direction, the gasket may vary in the axial direction depending on the fixing method between the housings, the material, processing, deformation, etc. It may not be able to keep up sufficiently.
An object of the present invention is to provide a sealing structure that can follow the variation in the axial direction while maintaining the sealing property.
　本発明の密封構造は、
　密封装置であって、
　　第１シールリップ先端を有し、径方向内方、かつ、軸方向において第１方向に延びる第１シールリップと、
　　第２シールリップ先端を有し、径方向内方、かつ、前記軸方向において前記第１方向と反対の第２方向に延びる第２シールリップと、
　　前記第１シールリップ及び前記第２シールリップを保持する保持環と、
　を有する密封装置と、
　前記密封装置が装着される装着空間を画定する複数の部材であって、
　　前記第１方向に位置する第１の端壁部を有する第１部材と、
　　外周壁部と、前記第２方向に位置する第２の端壁部と、を有する第２部材と、
　を有する複数の部材と、
　を有し、
　前記第１シールリップ先端は、軸方向反力によって前記保持環を前記第２の端壁部へ押圧するように、前記第１の端壁部に対して締め代を有する。 The sealed structure of the present invention
It is a sealing device
A first seal lip having a first seal lip tip and extending inward in the radial direction and in the first direction in the axial direction.
A second seal lip having a tip of the second seal lip and extending inward in the radial direction and extending in the second direction opposite to the first direction in the axial direction.
A holding ring that holds the first seal lip and the second seal lip,
With a sealing device,
A plurality of members that define a mounting space in which the sealing device is mounted.
A first member having a first end wall portion located in the first direction,
A second member having an outer peripheral wall portion and a second end wall portion located in the second direction.
With multiple members
Have,
The first seal lip tip has a tightening margin with respect to the first end wall portion so as to press the holding ring against the second end wall portion by an axial reaction force.
　本発明の密封構造によれば、シール性を維持しつつ、軸方向のバラつきに追随できる。 According to the sealing structure of the present invention, it is possible to follow the variation in the axial direction while maintaining the sealing property.
実施形態における自由状態の密封構造の要部断面図Sectional cross-sectional view of the main part of the sealed structure in the free state in the embodiment 実施形態における密封状態の密封構造の要部断面図Sectional drawing of the main part of the sealed structure in the sealed state in the embodiment 変形例における密封状態の密封構造の要部断面図Cross-sectional view of the main part of the sealed structure in the sealed state in the modified example 比較例における密封状態の密封構造の要部断面図Cross-sectional view of the main part of the sealed structure in the sealed state in the comparative example
＜実施形態＞
　以下、図１を参照して、実施形態の密封構造について説明する。本実施形態の密封構造は、自動車及び補機の分野、一般産業機械や建設機械の分野などで用いられる。具体的には、自動車エンジン用シールや燃料ポンプ用シールなどに用いられる。
　本実施形態の密封構造は、複数の部材１１、１２により画定される装着空間１４にリップシール（密封装置）２１を装着するものである。作図の都合上、複数の部材１１、１２及び装着空間１４は仮想線で描かれ、リップシール２１は装着前の自由状態にて描かれている。装着空間１４は、その形状から装着溝とも称される。 <Embodiment>
Hereinafter, the sealed structure of the embodiment will be described with reference to FIG. The sealed structure of this embodiment is used in the fields of automobiles and auxiliary machinery, general industrial machinery, construction machinery, and the like. Specifically, it is used for seals for automobile engines, seals for fuel pumps, and the like.
In the sealing structure of the present embodiment, the lip seal (sealing device) 21 is mounted in the mounting space 14 defined by the plurality of members 11 and 12. For convenience of drawing, the plurality of members 11, 12 and the mounting space 14 are drawn by virtual lines, and the lip seal 21 is drawn in a free state before mounting. The mounting space 14 is also referred to as a mounting groove because of its shape.
　複数の部材１１、１２は、第１部材１１と、第２部材１２を有する。第１部材１１は、上面からシールする部材である。第１部材１１は、油路径Ｒ１を有する。ここで、油路径Ｒ１とは、図１に示すように、中心軸線Ｏから第１部材１１までの最短距離である。
　第１部材１１は、第１の端壁部１６を有する。第１の端壁部１６はリップシール２１の軸に直交する平面状であり、リップシール２１の軸方向一方（図では上方）に設けられる。 The plurality of members 11 and 12 have a first member 11 and a second member 12. The first member 11 is a member that seals from the upper surface. The first member 11 has an oil passage diameter R1. Here, the oil passage diameter R1 is the shortest distance from the central axis O to the first member 11 as shown in FIG.
The first member 11 has a first end wall portion 16. The first end wall portion 16 has a planar shape orthogonal to the axis of the lip seal 21, and is provided on one side (upper in the figure) of the lip seal 21 in the axial direction.
　第２部材１２は、例えば、ハウジング、ケースである。第２部材１２は、油路径Ｒ２を有する。ここで、油路径Ｒ２とは、図１に示すように、中心軸線Ｏから第２部材１２までの最短距離である。第２部材１２は、第２の端壁部１７と、外周壁部１８とを有する。第２の端壁部１７はリップシール２１の軸に直交する平面状であり、リップシール２１の軸方向他方（図では下方）に設けられる。外周壁部１８は、円筒面状である。
　リップシール２１の外周面２１ａは、外周壁部１８と接触する。
　装着空間１４は、第１の端壁部１６と、第２の端壁部１７と、リップシール２１とによって囲まれる環状の空間として画定される。 The second member 12 is, for example, a housing or a case. The second member 12 has an oil passage diameter R2. Here, the oil passage diameter R2 is the shortest distance from the central axis O to the second member 12, as shown in FIG. The second member 12 has a second end wall portion 17 and an outer peripheral wall portion 18. The second end wall portion 17 has a planar shape orthogonal to the axis of the lip seal 21, and is provided on the other side (lower in the figure) in the axial direction of the lip seal 21. The outer peripheral wall portion 18 has a cylindrical surface shape.
The outer peripheral surface 21a of the lip seal 21 comes into contact with the outer peripheral wall portion 18.
The mounting space 14 is defined as an annular space surrounded by the first end wall portion 16, the second end wall portion 17, and the lip seal 21.
　リップシール２１は、保持環（リップ保持環、補強環）２２と、ゴム状弾性体２３とを有する。保持環２２は、リップシール２１を保持又は補強するものであり、金属等の剛材よりなる。保持環２２は、外周面と、内周面と、軸方向一方（上方）に位置する第１の端面２２ａと、軸方向他方（下方）に位置する第２の端面２２ｂとを有する。 The lip seal 21 has a holding ring (lip holding ring, reinforcing ring) 22 and a rubber-like elastic body 23. The holding ring 22 holds or reinforces the lip seal 21, and is made of a rigid material such as metal. The holding ring 22 has an outer peripheral surface, an inner peripheral surface, a first end surface 22a located on one axial direction (upper side), and a second end surface 22b located on the other axial direction (lower side).
　ゴム状弾性体２３は、保持環２２に架橋接着により被着される。ゴム状弾性体２３は、外周被着部２４と、端面被着部２５と、内周被着部２６とを有する。外周被着部２４は、保持環２２の外周面に被着される。端面被着部２５は、第１の端面２２ａに被着される。内周被着部２６は、保持環２２の内周面に被着される。外周被着部２４と、端面被着部２５と、内周被着部２６とは一体に形成される。
　第２の端面２２ｂにゴム状弾性体２３は被着されていても被着されていなくても良いが、第２の端面２２ｂにゴム状弾性体２３が被着されていないことが好ましい。この場合、第２の端面２２ｂが装着空間１４の第２の端壁部１７に直接接触することにより加圧時にリップシール２１の支えとなるため、リップシール２１の姿勢が安定し、耐圧性が向上する。 The rubber-like elastic body 23 is adhered to the holding ring 22 by cross-linking adhesion. The rubber-like elastic body 23 has an outer peripheral adherend portion 24, an end face adhered portion 25, and an inner peripheral adherent portion 26. The outer peripheral adherent portion 24 is adhered to the outer peripheral surface of the holding ring 22. The end face attachment portion 25 is adhered to the first end face 22a. The inner peripheral adhesion portion 26 is adhered to the inner peripheral surface of the holding ring 22. The outer peripheral adherent portion 24, the end face adherent portion 25, and the inner peripheral adherent portion 26 are integrally formed.
The rubber-like elastic body 23 may or may not be adhered to the second end face 22b, but it is preferable that the rubber-like elastic body 23 is not adhered to the second end face 22b. In this case, since the second end surface 22b directly contacts the second end wall portion 17 of the mounting space 14 to support the lip seal 21 during pressurization, the posture of the lip seal 21 is stable and the pressure resistance is increased. improves.
　ゴム状弾性体２３には、環状のシールリップ（第１シールリップ）２７が一体に形成される。シールリップ２７は、リップシール２１の内周側、かつ、リップシール２１の軸方向一方（図では上方）の端部から、径方向内方、かつ、軸方向一方（図では上方）へ向けて斜めに延びる。装着時にシールリップ先端（第１シールリップ先端）２７ａは、第１の端壁部１６に接触する。すなわち、シールリップ先端２７ａの軸方向先端部２７ｂは、第１の端壁部１６に接触する。 An annular seal lip (first seal lip) 27 is integrally formed on the rubber-like elastic body 23. The seal lip 27 is located on the inner peripheral side of the lip seal 21 and from one end in the axial direction (upper in the figure) of the lip seal 21 toward inward in the radial direction and one in the axial direction (upper in the figure). It extends diagonally. At the time of mounting, the seal lip tip (first seal lip tip) 27a comes into contact with the first end wall portion 16. That is, the axial tip portion 27b of the seal lip tip 27a comes into contact with the first end wall portion 16.
　シールリップ先端２７ａは、第１の端壁部１６に対し所定の締め代をもって接触する。これにより発生する軸方向反力が保持環２２を第２の端壁部１７に押圧することにより、保持環２２を軸方向に位置決めする。 The seal lip tip 27a comes into contact with the first end wall portion 16 with a predetermined tightening allowance. The axial reaction force generated thereby presses the holding ring 22 against the second end wall portion 17, thereby positioning the holding ring 22 in the axial direction.
　ゴム状弾性体２３には、環状の副シールリップ（第２シールリップ）２８が一体に形成される。副シールリップ２８は、リップシール２１の内周側、かつ、リップシール２１の軸方向他方（図では下方）の端部から、径方向内方、かつ、軸方向他方（図では下方）へ向けて斜めに延びる。シールリップ先端（第２シールリップ先端）２８ａを第２の端壁部１７に接触させることにより、リップシール２１と第２の端壁部１７の間をシールする。副シールリップ２８はこれに代えて、突起状ないしビード状を呈するシール部でも良い。 An annular sub-seal lip (second seal lip) 28 is integrally formed on the rubber-like elastic body 23. The secondary seal lip 28 is directed inward in the radial direction and from the other end in the axial direction (downward in the figure) of the lip seal 21 on the inner peripheral side of the lip seal 21 (downward in the figure). It extends diagonally. By bringing the seal lip tip (second seal lip tip) 28a into contact with the second end wall portion 17, the space between the lip seal 21 and the second end wall portion 17 is sealed. Instead of this, the secondary seal lip 28 may be a seal portion having a protruding or bead shape.
　本実施形態の密封構造によれば、シールリップ先端２７ａが第１の端壁部１６に対し所定の締め代をもって接触することにより、軸方向反力を発生する。
　軸方向反力が保持環２２を第２の端壁部１７に押圧するため、リップシール２１が軸方向に対して固定される。
　本実施形態のリップシール２１の外周面２１ａは、外周壁部１８と接触する。このため、リップシール２１を装着空間１４の中心軸線Ｏに対し同心状に位置決めできる。 According to the sealing structure of the present embodiment, an axial reaction force is generated when the sealing lip tip 27a comes into contact with the first end wall portion 16 with a predetermined tightening allowance.
Since the axial reaction force presses the holding ring 22 against the second end wall portion 17, the lip seal 21 is fixed in the axial direction.
The outer peripheral surface 21a of the lip seal 21 of the present embodiment comes into contact with the outer peripheral wall portion 18. Therefore, the lip seal 21 can be positioned concentrically with respect to the central axis O of the mounting space 14.
　シールリップ２７を除くリップシール２１の軸方向長さは、第１の端壁部１６および第２の端壁部１７の間の間隔よりも短い。そのため、リップシール２１は、装着空間１４内で軸方向のバラつきを生じる状態で装着空間１４に組み付けられることがある。
　本実施形態のシールリップ２７を含むリップシール２１の軸方向長さは、第１の端壁部１６および第２の端壁部１７の間の間隔よりも長い。このため、軸方向反力によってリップシール２１を第２の端壁部１７に押し付ける。したがって、軸方向のバラつきに追随できる。 The axial length of the lip seal 21 excluding the seal lip 27 is shorter than the distance between the first end wall portion 16 and the second end wall portion 17. Therefore, the lip seal 21 may be assembled in the mounting space 14 in a state where there is an axial variation in the mounting space 14.
The axial length of the lip seal 21 including the seal lip 27 of the present embodiment is longer than the distance between the first end wall portion 16 and the second end wall portion 17. Therefore, the lip seal 21 is pressed against the second end wall portion 17 by the axial reaction force. Therefore, it is possible to follow the variation in the axial direction.
　次に、図２を参照して、本実施形態の作用を説明する。
　図２は、実施形態における密封状態の密封構造の要部断面図を示す。図２に示すように、第１部材１１と第２部材１２を組み付けた際、リップシール２１が装着空間１４を密封する。この際、シールリップ２７は、第１部材１１側の第１の端壁部１６に沿って、弾性変形する。第１部材１１の油路径Ｒ１は、第２部材１２の油路径Ｒ２よりも小さい。すなわち、油路径Ｒ１と油路径Ｒ２に差がある。更に、シールリップ２７は、相対的に小さい油路径Ｒ１を有する第１部材１１側に沿って弾性変形するため、リップシール２１が装着空間１４から脱落することを防ぐことができる。本実施形態の密封構造によれば、第１部材１１と第２部材１２の油路径に差がある場合に、シール性を維持しつつ、軸方向のバラつきに追随できる。 Next, the operation of the present embodiment will be described with reference to FIG.
FIG. 2 shows a cross-sectional view of a main part of a sealed structure in a sealed state according to the embodiment. As shown in FIG. 2, when the first member 11 and the second member 12 are assembled, the lip seal 21 seals the mounting space 14. At this time, the seal lip 27 is elastically deformed along the first end wall portion 16 on the first member 11 side. The oil passage diameter R1 of the first member 11 is smaller than the oil passage diameter R2 of the second member 12. That is, there is a difference between the oil passage diameter R1 and the oil passage diameter R2. Further, since the seal lip 27 is elastically deformed along the side of the first member 11 having a relatively small oil passage diameter R1, it is possible to prevent the lip seal 21 from falling out of the mounting space 14. According to the sealing structure of the present embodiment, when there is a difference in the oil passage diameter between the first member 11 and the second member 12, it is possible to follow the variation in the axial direction while maintaining the sealing property.
（変形例）
　図３は、変形例における密封状態の密封構造の要部断面図を示す。変形例の密封構造は、実施形態の密封構造とは、第１部材１１の構成が異なる。それ以外の構成は、実施形態と同様である。変形例の第１部材１１は、フランジ付きの軸である。第１部材１１は、第１の端壁部１６に連なる内周壁部を有する。内周壁部は、円筒面状である。
　変形例の密封構造によれば、第１部材１１がフランジ付きの軸である場合に、シール性を維持しつつ、軸方向のバラつきに追随できる。 (Modification example)
FIG. 3 shows a cross-sectional view of a main part of a sealed structure in a sealed state in a modified example. The sealed structure of the modified example has a different configuration of the first member 11 from the sealed structure of the embodiment. Other configurations are the same as in the embodiment. The first member 11 of the modified example is a shaft with a flange. The first member 11 has an inner peripheral wall portion connected to the first end wall portion 16. The inner peripheral wall portion has a cylindrical surface shape.
According to the sealing structure of the modified example, when the first member 11 is a shaft with a flange, it is possible to follow the variation in the axial direction while maintaining the sealing property.
（比較例）
　図４は、比較例における密封状態の密封構造の要部断面図を示す。比較例の密封構造は、実施形態の密封構造とは、第１部材１１の構成が異なる。それ以外の構成は、実施形態と同様である。
　比較例の第１部材１１の油路径Ｒ１は、第２部材１２の油路径Ｒ２と略同一である。すなわち、油路径Ｒ１と油路径Ｒ２に実質的な差がない。この場合、シールリップ２７が第１部材１１側に沿って弾性変形する際、シールリップ２１が装着空間１４から脱落する可能性がある。 (Comparison example)
FIG. 4 shows a cross-sectional view of a main part of a sealed structure in a sealed state in a comparative example. The sealed structure of the comparative example has a different configuration of the first member 11 from the sealed structure of the embodiment. Other configurations are the same as in the embodiment.
The oil passage diameter R1 of the first member 11 of the comparative example is substantially the same as the oil passage diameter R2 of the second member 12. That is, there is no substantial difference between the oil passage diameter R1 and the oil passage diameter R2. In this case, when the seal lip 27 is elastically deformed along the side of the first member 11, the seal lip 21 may fall off from the mounting space 14.
　実施形態で説明した密封構造は、図２に示されるような、油路径Ｒ１と油路径Ｒ２に差を有する第１部材１１、第２部材１２や、図３に示されるように第１部材１１がフランジ付きの軸である場合に、好適に適用できる。 The sealing structure described in the embodiment includes the first member 11 and the second member 12 having a difference between the oil passage diameter R1 and the oil passage diameter R2 as shown in FIG. 2, and the first member 11 as shown in FIG. Can be suitably applied when is a shaft with a flange.
１１　第１部材
１２　第２部材
１４　装着空間
１６　第１の端壁部
１７　第２の端壁部
１８　外周壁部
２１　リップシール（密封装置）
２１ａ　外周面
２２　保持環
２２ａ　第１の端面
２２ｂ　第２の端面
２３　ゴム状弾性体
２４　外周被着部
２５　端面被着部
２６　内周被着部
２７　シールリップ（第１シールリップ）
２７ａ　シールリップ先端
２７ｂ　軸方向先端部
２８　副シールリップ（第２シールリップ）
Ｏ　中心軸線 11 1st member 12 2nd member 14 Mounting space 16 1st end wall part 17 2nd end wall part 18 Outer wall part 21 Lip seal (sealing device)
21a Outer peripheral surface 22 Holding ring 22a First end surface 22b Second end surface 23 Rubber-like elastic body 24 Outer outer surface adhered portion 25 End surface adhered portion 26 Inner peripheral adhered portion 27 Seal lip (first seal lip)
27a Seal lip tip 27b Axial tip 28 Sub-seal lip (second seal lip)
O central axis

Claims (6)

  1. 　密封装置であって、
    　　第１シールリップ先端を有し、径方向内方、かつ、軸方向において第１方向に延びる第１シールリップと、
    　　第２シールリップ先端を有し、径方向内方、かつ、前記軸方向において前記第１方向と反対の第２方向に延びる第２シールリップと、
    　　前記第１シールリップ及び前記第２シールリップを保持する保持環と、
    　を有する密封装置と、
    　前記密封装置が装着される装着空間を画定する複数の部材であって、
    　　前記第１方向に位置する第１の端壁部を有する第１部材と、
    　　外周壁部と、前記第２方向に位置する第２の端壁部と、を有する第２部材と、
    　を有する複数の部材と、
    　を有し、
    　前記第１シールリップ先端は、軸方向反力によって前記保持環を前記第２の端壁部へ押圧するように、前記第１の端壁部に対して締め代を有する、密封構造。     It is a sealing device
    A first seal lip having a first seal lip tip and extending inward in the radial direction and in the first direction in the axial direction.
    A second seal lip having a tip of the second seal lip and extending inward in the radial direction and extending in the second direction opposite to the first direction in the axial direction.
    A holding ring that holds the first seal lip and the second seal lip,
    With a sealing device,
    A plurality of members that define a mounting space in which the sealing device is mounted.
    A first member having a first end wall portion located in the first direction,
    A second member having an outer peripheral wall portion and a second end wall portion located in the second direction.
    With multiple members
    Have,
    The first seal lip tip has a sealing allowance with respect to the first end wall portion so as to press the holding ring against the second end wall portion by an axial reaction force.
  2. 　前記第１部材の油路径は、前記第２部材の油路径よりも小さい、
    　請求項１に記載の密封構造。     The oil passage diameter of the first member is smaller than the oil passage diameter of the second member.
    The sealed structure according to claim 1.
  3. 　前記第１部材は、軸を有するフランジである、
    　請求項１に記載の密封構造。     The first member is a flange having a shaft.
    The sealed structure according to claim 1.
  4. 　前記第２シールリップ先端は、前記第２の端壁部と接する、
    　請求項１～３のいずれかに記載の密封構造。     The tip of the second seal lip is in contact with the second end wall portion.
    The sealed structure according to any one of claims 1 to 3.
  5. 　前記密封装置は、前記外周壁部と接触する外周面を有する、
    　請求項１～４のいずれかに記載の密封構造。     The sealing device has an outer peripheral surface that comes into contact with the outer peripheral wall portion.
    The sealed structure according to any one of claims 1 to 4.
  6. 　前記第１シールリップ先端は、前記第２シールリップ先端よりも径方向内方に位置する、
    　請求項１～５のいずれかに記載の密封構造。     The tip of the first seal lip is located radially inward with the tip of the second seal lip.
    The sealed structure according to any one of claims 1 to 5.
PCT/JP2020/023980 2019-07-25 2020-06-18 Sealed structure WO2021014842A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-136984 2019-07-25
JP2019136984 2019-07-25

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Publication Number Publication Date
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ID=74193051

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Application Number Title Priority Date Filing Date
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0640523U (en) * 1992-10-30 1994-05-31 エヌオーケー株式会社 gasket
JPH07151233A (en) * 1993-09-02 1995-06-13 Eaton Corp Holding type sealing device
JP2008256193A (en) * 2007-03-09 2008-10-23 Uchiyama Mfg Corp Vibration damping washer
JP6502318B2 (en) * 2014-03-14 2019-04-17 Nok株式会社 gasket

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0640523U (en) * 1992-10-30 1994-05-31 エヌオーケー株式会社 gasket
JPH07151233A (en) * 1993-09-02 1995-06-13 Eaton Corp Holding type sealing device
JP2008256193A (en) * 2007-03-09 2008-10-23 Uchiyama Mfg Corp Vibration damping washer
JP6502318B2 (en) * 2014-03-14 2019-04-17 Nok株式会社 gasket

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