JP2008240949A - Sealing device - Google Patents

Sealing device Download PDF

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JP2008240949A
JP2008240949A JP2007084375A JP2007084375A JP2008240949A JP 2008240949 A JP2008240949 A JP 2008240949A JP 2007084375 A JP2007084375 A JP 2007084375A JP 2007084375 A JP2007084375 A JP 2007084375A JP 2008240949 A JP2008240949 A JP 2008240949A
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ring
lip
metal ring
annular
metal
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Yoshibumi Shige
義文 重
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JTEKT Corp
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JTEKT Corp
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Priority to JP2007084375A priority Critical patent/JP2008240949A/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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device capable of improving sealing property while suppressing torque loss. <P>SOLUTION: The sealing device is provided with a first metal ring 61 having a cylinder part 62 and a ring-like part 63 fitted in an inner ring 32 and a second metal ring 71 having a cylinder part 72 and a ring-like part 73 fitted in an outer ring 40. At the ring-like part 73 of the one metal ring 71, an axial lip 80 protruding toward the ring-like part 63 of the other metal ring 61 is formed. The axial lip 80 has first and second lip parts 82, 83. In an initial period when the first and the second metal rings 61, 71 are installed in a ring-like space, the first lip part 82 slides in contact with the ring-like part 63 of the other metal ring 61 and the second lip part 83 is in a state out of contact with the ring-like part 63 of the other metal ring 61. When the first lip part 82 is worn by a predetermined quantity, the second lip part 83 slides in contact with the ring-like part 63 of the metal ring 61. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、相対的に回転される内・外輪の間の環状空間を密封する密封装置に関する。   The present invention relates to a sealing device that seals an annular space between a relatively rotated inner and outer rings.

この種の密封装置は、例えば、車輪用転がり軸受装置の内輪と外輪との間の間の環状空間を密封するために用いられる。
これにおいては、図５に示すように、内輪１３２の外周面端部に圧入によって嵌込まれる金属製の第１の金属環１６１と、外輪１４０の内周面端部に嵌込まれる金属製の第２の金属環１７１とを備えている。
そして、第２の金属環１７１の環状部１７２の内径端部には、第１の金属環１６１の筒状部１６２の周面に摺接する主リップ部１７６とグリースリップ部１７７とを有する弾性体よりなる径方向リップ１７５が形成され、第２の金属環１７１の環状部１７３の先端寄り側面には、第１の金属環１６１の環状部１６３に向けて突出するゴムなどの弾性体よりなる軸方向リップ１８０が形成された構造のものが知られている。
このような構造をもつ密封装置としては、例えば、特許文献１に開示されている。
特開２００２−２１３６２０号公報 Such a sealing device is used, for example, to seal an annular space between an inner ring and an outer ring of a rolling bearing device for a wheel.
In this, as shown in FIG. 5, a first metal ring 161 that is fitted into the outer peripheral surface end portion of the inner ring 132 by press-fitting, and a metal fitting that is fitted into the inner peripheral surface end portion of the outer ring 140. A second metal ring 171.
An elastic body having a main lip portion 176 and a grease lip portion 177 slidably in contact with the peripheral surface of the cylindrical portion 162 of the first metal ring 161 at the inner diameter end portion of the annular portion 172 of the second metal ring 171. And a shaft made of an elastic material such as rubber protruding toward the annular portion 163 of the first metal ring 161 on the side surface near the tip of the annular portion 173 of the second metal ring 171. A structure in which a directional lip 180 is formed is known.
An example of a sealing device having such a structure is disclosed in Patent Document 1.
JP 2002-213620 A

ところで、図５に示すような従来の密封装置においては、車両走行時の車輪が跳ね上げる泥水が、第１の金属環１６１の環状部１６３の外径端と第２の金属環１７１の筒状部１７２の内周面との間の隙間から浸入すると、その泥水中の泥成分によって軸方向リップ１８０の先端部（摺接部）１８０ａが摩耗される場合がある。そして、軸方向リップ１８０の先端部１８０ａの摩耗が著しくなると、泥水が軸方向リップ１８０を通して径方向リップ１７５に達する場合がある。この場合には、径方向リップ１７５の主リップ部１７６及びグリースリップ部１７７のそれぞれの先端部（摺接部）１７６ａ、１７７ａにおいても摩耗されることが想定され、ついには泥水が転がり軸受内に浸入する恐れがある。
そこで、第２の金属環１７１の筒状部１７２の側面に、第１の金属環１６１の環状部１６３に摺接する複数の軸方向リップを突設して二重（又は多重）に密封することが考えられる。
しかしながら、複数の軸方向リップの先端部を第１の金属環１６１の環状部１６３に摺接させて二重（又は多重）に密封すると、摺動摩擦力が大きくなり、この分だけトルクが損失する。
また、複数の軸方向リップを摺接させると、これら各リップ間の間隔が狭いと、各リップに摺接（摩擦）による発熱により、各リップを構成するゴムが硬化して密封性が低下する恐れがある。 By the way, in the conventional sealing device as shown in FIG. 5, the muddy water splashed by the wheel when the vehicle travels is formed in the cylindrical shape of the outer diameter end of the annular portion 163 of the first metal ring 161 and the second metal ring 171. When entering from the gap between the inner peripheral surface of the portion 172, the tip portion (sliding contact portion) 180a of the axial lip 180 may be worn by the mud component in the muddy water. Then, when wear of the distal end portion 180 a of the axial lip 180 becomes significant, muddy water may reach the radial lip 175 through the axial lip 180. In this case, it is assumed that the main lip portion 176 of the radial lip 175 and the tip end portions (sliding contact portions) 176a and 177a of the grease lip portion 177 are also worn, and finally muddy water enters the rolling bearing. There is a risk of intrusion.
Therefore, a plurality of axial lips that slidably contact the annular portion 163 of the first metal ring 161 are provided on the side surface of the cylindrical portion 172 of the second metal ring 171 so as to be sealed in a double (or multiple) manner. Can be considered.
However, if the tip portions of the plurality of axial lips are brought into sliding contact with the annular portion 163 of the first metal ring 161 and sealed in a double (or multiple) manner, the sliding frictional force increases, and the torque is lost accordingly. .
Further, when a plurality of axial lips are brought into sliding contact with each other, if the distance between the lips is narrow, the heat constituting the lips is cured by heat generated by sliding contact (friction) with each lip and the sealing performance is lowered. There is a fear.

この発明の目的は、前記問題点に鑑み、トルク損失を抑制しながら密封性の向上を図ることができる密封装置を提供することである。   In view of the above problems, an object of the present invention is to provide a sealing device that can improve sealing performance while suppressing torque loss.

前記目的を達成するために、この発明の請求項１に係る密封装置は、相対的に回転される内・外輪の間の環状空間を密封する密封装置であって、
前記内輪の外周面に嵌込まれる筒状部と、この筒状部の一端から径方向外方に突設された環状部とを一体に有する第１の金属環と、
前記外輪の内周面に嵌込まれる筒状部と、この筒状部の一端から径方向内方に突設され、かつ前記第１の金属環の環状部に対向する環状部とを一体に有する第２の金属環とを備え、
前記第１、第２の両金属環のうち、一方の金属環の環状部には、他方の金属環の環状部に向けて突出する弾性体よりなる軸方向リップが形成され、
前記軸方向リップは、第１、第２のリップ部を有し、
前記環状空間に前記第１、第２の両金属環が組み込まれた初期において、前記第１リップ部は前記他方の金属環の環状部に摺接する一方、前記第２リップ部は前記他方の金属環の環状部に非接触の状態とされ、
前記第１リップ部が所定量摩耗されたときに、前記第２リップ部が前記他方の金属環の環状部に摺接する構成にしてあることを特徴とする。 To achieve the above object, a sealing device according to claim 1 of the present invention is a sealing device for sealing an annular space between a relatively rotated inner and outer ring,
A first metal ring integrally including a cylindrical portion fitted on the outer peripheral surface of the inner ring and an annular portion projecting radially outward from one end of the cylindrical portion;
A cylindrical portion that is fitted into the inner peripheral surface of the outer ring, and an annular portion that protrudes radially inward from one end of the cylindrical portion and that faces the annular portion of the first metal ring are integrated. A second metal ring having
Of the first and second metal rings, the annular part of one metal ring is formed with an axial lip made of an elastic body projecting toward the annular part of the other metal ring,
The axial lip has first and second lip portions;
In the initial stage when the first and second metal rings are incorporated in the annular space, the first lip portion is in sliding contact with the annular portion of the other metal ring, while the second lip portion is the other metal. It is in a non-contact state with the annular portion of the ring,
The second lip portion is configured to be in sliding contact with the annular portion of the other metal ring when the first lip portion is worn by a predetermined amount.

前記構成によると、内・外輪の間の環状空間に第１、第２の両金属環が組み込まれた初期において、一方の金属環に形成された軸方向リップの第１、第２のリップ部のうち、第１リップ部が他方の金属環の環状部に摺接し、第２リップ部が他方の金属環の環状部に非接触の状態とされる。このため、内・外輪が相対的に回転する際に、複数の軸方向リップの先端部を他方の金属環の環状部にそれぞれ摺接させて二重（又は多重）に密封する場合と比べ、軸方向リップの第１リップ部のみの摺動摩擦力に小さく抑えることができる。
また、長期間の使用によって第１リップ部が所定量摩耗されたときには、第２リップ部が他方の金属環の環状部に摺接することで密封性を確保することができる。この結果、トルク損失を抑制しながら密封性の向上を図ることができる。 According to the above configuration, the first and second lip portions of the axial lip formed on one of the metal rings at the initial stage when the first and second metal rings are incorporated in the annular space between the inner and outer rings. Of these, the first lip portion is in sliding contact with the annular portion of the other metal ring, and the second lip portion is not in contact with the annular portion of the other metal ring. For this reason, when the inner and outer rings rotate relative to each other, compared to the case where the end portions of the plurality of axial lips are slidably contacted with the annular portion of the other metal ring and sealed in a double (or multiple) manner, The sliding frictional force of only the first lip portion of the axial lip can be kept small.
In addition, when the first lip portion is worn by a predetermined amount due to long-term use, the second lip portion can be in sliding contact with the annular portion of the other metal ring to ensure sealing performance. As a result, it is possible to improve the sealing performance while suppressing torque loss.

請求項２に係る密封装置は、請求項１に記載の密封装置であって、
軸方向リップの第１、第２のリップ部は、共通の根元部を有し、かつこの根元部を弾性変形部として一方の金属環の環状部に一体状に接合されると共に、二股状をなして他方の金属環の環状部に向けて突出していることを特徴とする。
前記構成によると、軸方向リップの第１、第２のリップ部が共通の根元部を弾性変形部として弾性変形することで、第１リップ部が所定量摩耗されたときには、根元部の弾性変形部の弾性変形に基づく弾発力によって第２リップ部が他方の金属環の環状部に確実に摺接するため、密封性を良好に確保することができる。 A sealing device according to claim 2 is the sealing device according to claim 1,
The first and second lip portions of the axial lip have a common root portion, and are integrally joined to the annular portion of one metal ring with the root portion as an elastic deformation portion, and have a bifurcated shape. It is characterized by projecting toward the annular portion of the other metal ring.
According to the above configuration, the first and second lip portions of the axial lip are elastically deformed by using the common root portion as an elastic deformation portion, and when the first lip portion is worn by a predetermined amount, the elastic deformation of the root portion is performed. Since the second lip portion surely comes into sliding contact with the annular portion of the other metal ring by the elastic force based on the elastic deformation of the portion, it is possible to ensure good sealing performance.

次に、この発明を実施するための最良の形態を実施例にしたがって説明する。   Next, the best mode for carrying out the present invention will be described with reference to examples.

（実施例１）
この発明の実施例１を図１〜図３にしたがって説明する。
図１はこの発明の実施例１に係る密封装置が採用された転がり軸受を備えた車輪用転がり軸受装置を示す側断面図である。図２は転がり軸受の内輪と外輪との間に密封装置が組み付けられた状態を拡大して示す断面図である。図３は第２の金属環の径方向リップ及び軸方向リップの自由状態を示す断面図である。図４は第１リップ部が所定量摩耗されたときに第２リップ部が他方の金属環の環状部に摺接した状態を示す断面図である。 Example 1
A first embodiment of the present invention will be described with reference to FIGS.
1 is a side sectional view showing a wheel rolling bearing device provided with a rolling bearing in which a sealing device according to Embodiment 1 of the present invention is adopted. FIG. 2 is an enlarged sectional view showing a state in which the sealing device is assembled between the inner ring and the outer ring of the rolling bearing. FIG. 3 is a cross-sectional view showing the free state of the radial lip and the axial lip of the second metal ring. FIG. 4 is a cross-sectional view showing a state in which the second lip portion is in sliding contact with the annular portion of the other metal ring when the first lip portion is worn by a predetermined amount.

図１に示すように、車輪用転がり軸受装置としての車輪用ハブユニットは、ハブホイール２０と、転がり軸受としての複列のアンギュラ玉軸受３１とを一体状に有してユニット化されている。
ハブホイール２０は、筒軸状をなすハブ軸２１と、ハブ軸２１の一端部寄り外周面に形成されたフランジ２２とを一体に有し、このフランジ２２には、ブレーキロータ（図示しない）を間に挟んで車輪（図示しない）を取り付けるための複数本のハブボルト２５が所定ピッチでかつ圧入によって固定されている。
また、ハブホイール２０は、そのハブ軸２１の内孔において、シャフト（例えば、ドライブシャフト）がスプライン嵌合されて挿通された後、シャフト先端の雄ねじ部にナットが締め付けられることで、シャフトにトルク伝達可能に連結される。 As shown in FIG. 1, a wheel hub unit as a wheel rolling bearing device is unitized by integrally including a hub wheel 20 and a double row angular ball bearing 31 as a rolling bearing.
The hub wheel 20 integrally includes a hub shaft 21 having a cylindrical shaft shape and a flange 22 formed on the outer peripheral surface near one end of the hub shaft 21, and a brake rotor (not shown) is provided on the flange 22. A plurality of hub bolts 25 for attaching wheels (not shown) sandwiched therebetween are fixed at a predetermined pitch and press-fitted.
Further, in the hub wheel 20, a shaft (for example, a drive shaft) is spline-fitted through the inner hole of the hub shaft 21, and then a nut is tightened on the male screw portion at the tip of the shaft, whereby torque is applied to the shaft. It is connected so that it can be transmitted.

ハブホイール２０のハブ軸２１の外周には、複列のアンギュラ玉軸受３１が組み付けられている。すなわち、この実施例１において、ハブ軸２１は、フランジ２２側に形成された大径軸部２１ａと、大径軸部２１ａよりも適宜に小径でかつ大径軸部２１ａと段差面をもって連続する小径軸部２１ｂとを備えている。
そして、ハブ軸２１の大径軸部２１ａの外周面に一方の軌道面３３が形成され、小径軸部２１ｂの外周面には、他方の軌道面３４が外周面に形成された内輪３２が圧入によって嵌込まれて、かつ小径軸部２１ｂ先端のかしめ部２７によって固定されている。 A double-row angular ball bearing 31 is assembled on the outer periphery of the hub shaft 21 of the hub wheel 20. That is, in the first embodiment, the hub shaft 21 has a large-diameter shaft portion 21a formed on the flange 22 side, and is appropriately smaller in diameter than the large-diameter shaft portion 21a and is continuous with the large-diameter shaft portion 21a with a step surface. And a small-diameter shaft portion 21b.
One raceway surface 33 is formed on the outer peripheral surface of the large-diameter shaft portion 21a of the hub shaft 21, and an inner ring 32 having the other raceway surface 34 formed on the outer peripheral surface is press-fitted into the outer peripheral surface of the small-diameter shaft portion 21b. And is fixed by a caulking portion 27 at the tip of the small diameter shaft portion 21b.

複列のアンギュラ玉軸受３１の外輪４０の内周面には、ハブ軸２１側の両軌道面３３、３４に対応する両軌道面４１、４２がそれぞれ形成され、ハブ軸２１側の両軌道面３３、３４と、外輪４０の両軌道面４１、４２の間には転動体としての複数個の玉５１、５２がそれぞれ転動可能に組み込まれ、これら各複数個の玉５１、５２が保持器５５、５６によって保持されることでアンギュラ玉軸受３１が構成されている。   Both raceway surfaces 41, 42 corresponding to both raceway surfaces 33, 34 on the hub shaft 21 side are formed on the inner peripheral surface of the outer ring 40 of the double row angular ball bearing 31, and both raceway surfaces on the hub shaft 21 side are formed. A plurality of balls 51 and 52 as rolling elements are respectively incorporated between the raceways 33 and 34 and the raceway surfaces 41 and 42 of the outer ring 40 so as to be able to roll, and each of the plurality of balls 51 and 52 is a cage. The angular ball bearing 31 is configured by being held by 55 and 56.

また、ハブホイール２０の外輪４０の外周面の軸方向略中央部には、車体側部材、例えば、車両の懸架装置（図示しない）に支持されたナックル、又はキャリアの取付面にボルトによって固定するため固定フランジ４５が形成されている。   Further, at the substantially central portion in the axial direction of the outer peripheral surface of the outer ring 40 of the hub wheel 20, a vehicle body side member, for example, a knuckle supported by a vehicle suspension device (not shown) or a mounting surface of a carrier is fixed with a bolt. Therefore, a fixed flange 45 is formed.

図１と図２に示すように、内輪３２と外輪４０との間の環状空間を密封するための密封装置６０は、内輪３２の外周面３５に組み付けられる第１の金属環（スリンガと呼ばれることもある）６１と、外輪４０の内周面４３に組み付けられる第２の金属環７１とを備えて構成されている。
図２に示すように、第１の金属環６１は、金属板のプレス加工によって形成され、内輪３２の外周面３５に圧入される筒状部６２と、この筒状部６２の一端から半径方向外側に向けて突出された突輪部７３とを有して断面略Ｌ字状をなしている。 As shown in FIGS. 1 and 2, the sealing device 60 for sealing the annular space between the inner ring 32 and the outer ring 40 is a first metal ring (called a slinger) assembled to the outer peripheral surface 35 of the inner ring 32. 61) and a second metal ring 71 assembled to the inner peripheral surface 43 of the outer ring 40.
As shown in FIG. 2, the first metal ring 61 is formed by pressing a metal plate, and has a cylindrical portion 62 that is press-fitted into the outer peripheral surface 35 of the inner ring 32, and a radial direction from one end of the cylindrical portion 62. It has a protruding ring portion 73 protruding outward and has a substantially L-shaped cross section.

図２と図３に示すように、第２の金属環７１は、金属板のプレス加工によって形成され、外輪４０の内周面４３に圧入される筒状部７２と、この筒状部７２の一端から半径方向外側に向けて突出された環状部７３とを有して断面略逆Ｌ字状をなしている。
そして、第２の金属環７１の筒状部７２の内周面から環状部７３の一側面（第１の金属環６１の環状部６３に対向する側面）にわたって、軟質樹脂、ゴム等のエラストマよりなる弾性層７４が一体に接合されている。
この実施例１において、弾性層７４は加硫ゴムによって形成され、第２の金属環７１の筒状部７２の内周面と環状部７３の一側面に加硫接着（加硫接合）によって固着されている。そして、弾性層７４には、次に詳述する径方向リップ７５と軸方向リップ８０とが同一材料によって一体に形成されている。 As shown in FIGS. 2 and 3, the second metal ring 71 is formed by pressing a metal plate and is press-fitted into the inner peripheral surface 43 of the outer ring 40. It has an annular portion 73 that protrudes radially outward from one end and has a substantially inverted L-shaped cross section.
From an inner peripheral surface of the cylindrical portion 72 of the second metal ring 71 to one side surface of the annular portion 73 (side surface facing the annular portion 63 of the first metal ring 61), an elastomer such as soft resin or rubber is used. An elastic layer 74 is integrally bonded.
In the first embodiment, the elastic layer 74 is formed of vulcanized rubber, and is fixed to the inner peripheral surface of the cylindrical portion 72 of the second metal ring 71 and one side surface of the annular portion 73 by vulcanization adhesion (vulcanization bonding). Has been. In the elastic layer 74, a radial lip 75 and an axial lip 80, which will be described in detail below, are integrally formed of the same material.

図２と図３に示すように、第２の金属環７１の環状部７２の内径端部に位置する弾性層７４の部分には、第１の金属環６１の筒状部６２の外周面に向けて径方向リップ７５が一体に延出されている。この径方向リップ７５は、第１の金属環６１の筒状部６２の外周面にそれぞれ弾性的に撓んで摺接する主リップ部７６とグリースリップ部７７とを有して二股状をなしている。   As shown in FIGS. 2 and 3, the elastic layer 74 located at the inner diameter end of the annular portion 72 of the second metal ring 71 has an outer peripheral surface of the cylindrical portion 62 of the first metal ring 61. A radial lip 75 is integrally extended toward the end. The radial lip 75 has a main lip portion 76 and a grease lip portion 77 that are elastically bent and slidably contact with the outer peripheral surface of the cylindrical portion 62 of the first metal ring 61 to form a bifurcated shape. .

図２と図３に示すように、第２の金属環７１の環状部７２の先端寄り側面に位置する弾性体７４の部分には、第１の金属環６１の環状部６３の側面に向けて突出する軸方向リップ８０が一体に延出されている。
軸方向リップ８０は、弾性層７４から共通の根元部８１を有して第１の金属環６１の環状部６３に向けて突出された第１リップ部８２と、この第１リップ部８２よりも径方向内側に配置された第２リップ部８３とを備えて二股状をなしている。
さらに、第１、第２のリップ部８２、８３は、共通の根元部８１を弾性変形部とすると共に、これら第１、第２のリップ部８２、８３自身においてもそれぞれ弾性変形可能に形成されている。
そして、図２に示すように、内輪３２と外輪４０との間の環状空間に第１、第２の両金属環６１、７１が組み込まれた初期において、第１リップ部８２が第１の金属環６１の環状部６３に弾性的に撓んで摺接する一方、第２リップ部８３は、第１の金属環６１の環状部６３に僅かな隙間を隔てて非接触の状態とされる。
さらに、図４に示すように、第１リップ部８２の先端部８２ａが所定量摩耗されたときに、第２リップ部８３の先端部８３ａが第１の金属環６１の環状部６３に弾性的に撓んで摺接するように、弾性層７４からの第１、第１のリップ部８２、８３の各先端部８２ａ、８３ａの延出長さがそれぞれ設定されている。 As shown in FIGS. 2 and 3, the elastic body 74 located on the side surface near the tip of the annular portion 72 of the second metal ring 71 faces the side surface of the annular portion 63 of the first metal ring 61. A protruding axial lip 80 extends integrally.
The axial lip 80 has a common base portion 81 from the elastic layer 74 and protrudes toward the annular portion 63 of the first metal ring 61, and more than the first lip portion 82. A second lip portion 83 disposed on the radially inner side is provided to form a bifurcated shape.
Further, the first and second lip portions 82 and 83 are formed so that the common base portion 81 is an elastic deformation portion, and the first and second lip portions 82 and 83 themselves are also elastically deformable. ing.
As shown in FIG. 2, at the initial stage when both the first and second metal rings 61 and 71 are incorporated in the annular space between the inner ring 32 and the outer ring 40, the first lip portion 82 is the first metal. The second lip portion 83 is brought into a non-contact state with a slight gap from the annular portion 63 of the first metal ring 61 while being elastically bent and brought into sliding contact with the annular portion 63 of the ring 61.
Further, as shown in FIG. 4, when the tip end portion 82 a of the first lip portion 82 is worn by a predetermined amount, the tip end portion 83 a of the second lip portion 83 is elastically attached to the annular portion 63 of the first metal ring 61. The extension lengths of the tip portions 82a and 83a of the first and first lip portions 82 and 83 from the elastic layer 74 are set so as to be slid and come into sliding contact with each other.

この実施例１に係る密封装置は上述したように構成される。
したがって、内輪３２と外輪４０との間の環状空間に密封装置６０を組み付ける場合、まず、第２の金属環７１がその第２の金属環７１の筒状部７２において、外輪４０の一端開口部側から内周面４３の所定位置まで圧入されて組み付けられる。
次に、第１の金属環６１がその筒状部６２において、内輪３２の一端側から外周面の所定位置まで圧入されて組み付けられる。 The sealing device according to the first embodiment is configured as described above.
Therefore, when the sealing device 60 is assembled in the annular space between the inner ring 32 and the outer ring 40, first, the second metal ring 71 is located at one end opening of the outer ring 40 in the cylindrical portion 72 of the second metal ring 71. It is press-fitted from the side to a predetermined position on the inner peripheral surface 43 and assembled.
Next, the first metal ring 61 is press-fitted from the one end side of the inner ring 32 to a predetermined position on the outer peripheral surface in the cylindrical portion 62 and assembled.

図２に示すように、内輪３２と外輪４０との間の環状空間に第１、第２の金属環６１、７１が組み込まれた初期において、第１の金属環６１に形成された軸方向リップ８０の第１リップ部８２の先端部８２ａが第１の金属環６１の環状部６３に弾性的に撓んで摺接し、第２リップ部８３の先端部８３ａは、第１の金属環６１の環状部６３の側面に僅かな隙間を隔てて非接触の状態とされる。
このため、内・外輪３２、４０が相対的に回転する軸受回転時の際に、複数の軸方向リップを金属環の環状部にそれぞれ摺接させて二重（又は多重）に密封する場合と比べ、軸方向リップ８０の第１リップ部８２のみの摺動摩擦力に抑えることができ、トルク損失を抑制することができる。
また、長期間の使用によって第１リップ部８２の先端部８２ａが所定量摩耗されたときには、図４に示すように、第２リップ部８３の先端部８３ａが第１の金属環６１の環状部６３に摺接することで密封性を確保することができ、密封性の向上を図ることができる。 As shown in FIG. 2, the axial lip formed on the first metal ring 61 at the initial stage when the first and second metal rings 61, 71 are incorporated in the annular space between the inner ring 32 and the outer ring 40. The distal end portion 82 a of the first lip portion 82 of the 80 is elastically bent and slidably contacts the annular portion 63 of the first metal ring 61, and the distal end portion 83 a of the second lip portion 83 is annular of the first metallic ring 61. The side surface of the portion 63 is not contacted with a slight gap.
For this reason, a plurality of axial lips are brought into sliding contact with the annular portion of the metal ring and sealed in a double (or multiple) manner during rotation of the bearing in which the inner and outer rings 32 and 40 rotate relatively. In comparison, the sliding frictional force of only the first lip portion 82 of the axial lip 80 can be suppressed, and torque loss can be suppressed.
Further, when the tip portion 82a of the first lip portion 82 is worn by a predetermined amount due to long-term use, the tip portion 83a of the second lip portion 83 is an annular portion of the first metal ring 61 as shown in FIG. Sealing performance can be ensured by sliding contact with 63, and sealing performance can be improved.

また、この実施例１において、軸方向リップ８０の第１、第２のリップ部８２、８３は、共通の根元部８１を弾性変形部として弾性的に撓む。これによって、図４に示すように、第１リップ部８２の先端部８２ａが所定量摩耗されたときには、根元部８１の弾性変形部の弾性変形に基づく弾発力によって第２リップ部８３の先端部８３ａが第１の金属環６１の環状部６３に弾性的に撓んで確実に摺接する。このため、密封性を良好に確保することができ、密封装置としての機能を長期間にわたって維持することができる。   In the first embodiment, the first and second lip portions 82 and 83 of the axial lip 80 are elastically bent with the common root portion 81 as an elastic deformation portion. As a result, as shown in FIG. 4, when a predetermined amount of the tip portion 82 a of the first lip portion 82 is worn, the tip of the second lip portion 83 is caused by the elastic force based on the elastic deformation of the elastic deformation portion of the root portion 81. The portion 83 a is elastically bent to the annular portion 63 of the first metal ring 61 and reliably comes into sliding contact. For this reason, the sealing performance can be secured satisfactorily, and the function as the sealing device can be maintained for a long time.

なお、この発明は前記実施例１に限定するものではない。
例えば、前記実施例１においては、車輪用転がり軸受装置（車輪用ハブユニット）のアンギュラ玉軸受３１を構成する内輪３２と外輪４０との間の環状空間に組み付けられる密封装置６０である場合を例示したが、各種の転がり軸受、例えば、単列、複列のアンギュラ玉軸受、円すいころ軸受、円筒こと軸受等に採用することができる。
また、転がり軸受以外においても、相対的に回転される内・外輪の間の環状空間を密封する密封装置として採用することができる。
また、前記実施例１においては、第２の金属環７１に、第１、第２のリップ部８２、８３を有する軸方向リップ８０が形成される場合を例示したが、第１の金属環６１に第１、第２のリップ部８２、８３を有する軸方向リップ８０が形成される場合においても実施可能である。
また、前記実施例１においては、内輪３２と外輪４０との間に密封装置６０を組み付ける場合、まず、第２の金属環７１を外輪４０に取り付けてから、第１の金属環６１を内輪３２に取り付けたが、予め第１の金属環６１と第２の金属環７１とを組み合わせておいて一体物としておき、内輪３２と外輪４０との間に同時に組み付けるようにしてもよい。但し、この場合には、第１のリップ８２、第２のリップ８３と環状部６３との接触状態が前記実施例１と同じになるよう、第１の金属環６１の内輪３２への軸方向の取り付け位置、及び第２の金属環７１の外輪４０への軸方向の取り付け位置を組み付け時に調整するようにする。 The present invention is not limited to the first embodiment.
For example, in the said Example 1, the case where it is the sealing device 60 assembled | attached to the annular space between the inner ring | wheel 32 and the outer ring | wheel 40 which comprise the angular ball bearing 31 of the wheel rolling bearing apparatus (wheel hub unit) is illustrated. However, it can be applied to various types of rolling bearings such as single-row and double-row angular contact ball bearings, tapered roller bearings, and cylindrical bearings.
Moreover, it can employ | adopt as a sealing device which seals the cyclic | annular space between the inner / outer ring | wheels rotated relatively also besides rolling bearings.
In the first embodiment, the case where the axial lip 80 having the first and second lip portions 82 and 83 is formed on the second metal ring 71 is exemplified. This can also be implemented when the axial lip 80 having the first and second lip portions 82 and 83 is formed.
In the first embodiment, when the sealing device 60 is assembled between the inner ring 32 and the outer ring 40, first, the second metal ring 71 is attached to the outer ring 40, and then the first metal ring 61 is attached to the inner ring 32. However, the first metal ring 61 and the second metal ring 71 may be combined in advance to form an integrated body, and the inner ring 32 and the outer ring 40 may be assembled at the same time. However, in this case, the axial direction of the first metal ring 61 toward the inner ring 32 is such that the contact state between the first lip 82, the second lip 83, and the annular portion 63 is the same as in the first embodiment. The mounting position of the second metal ring 71 and the mounting position in the axial direction of the second metal ring 71 on the outer ring 40 are adjusted during assembly.

この発明の実施例１に係る密封装置が採用された転がり軸受を備えた車輪用ハブユニットを示す側断面図である。It is a sectional side view which shows the hub unit for wheels provided with the rolling bearing by which the sealing device based on Example 1 of this invention was employ | adopted. 同じく転がり軸受の内輪と外輪との間に密封装置が組み付けられた状態を拡大して示す断面図である。It is sectional drawing which expands and shows the state by which the sealing device was similarly assembled | attached between the inner ring | wheel and outer ring | wheel of the rolling bearing. 同じく第２の金属環の径方向リップ及び軸方向リップの自由状態を示す断面図である。It is sectional drawing which similarly shows the free state of the radial direction lip and axial direction lip of a 2nd metal ring. 同じく第１リップ部が所定量摩耗されたときに第２リップ部が他方の金属環の環状部に摺接した状態を示す断面図である。Similarly, when the first lip portion is worn by a predetermined amount, the second lip portion is a cross-sectional view showing a state in which the second lip portion is in sliding contact with the annular portion of the other metal ring. 従来の密封装置を示す断面図である。It is sectional drawing which shows the conventional sealing device.

符号の説明Explanation of symbols

３１ アンギュラ玉軸受（転がり軸受）
３２ 内輪
４０ 外輪
６０ 密封装置
６１ 第１の金属環
６２ 筒状部
６３ 環状部
７１ 第２の金属環
７２ 筒状部
７３ 環状部
７５ 径方向リップ
８０ 軸方向リップ
８１ 根元部
８２ 第１リップ部
８３ 第２リップ部 31 Angular contact ball bearings (rolling bearings)
32 Inner ring 40 Outer ring 60 Sealing device 61 First metal ring 62 Cylindrical part 63 Annular part 71 Second metal ring 72 Cylindrical part 73 Annular part 75 Radial lip 80 Axial lip 81 Root part 82 First lip part 83 2nd lip

Claims (2)

相対的に回転される内・外輪の間の環状空間を密封する密封装置であって、
前記内輪の外周面に嵌込まれる筒状部と、この筒状部の一端から径方向外方に突設された環状部とを一体に有する第１の金属環と、
前記外輪の内周面に嵌込まれる筒状部と、この筒状部の一端から径方向内方に突設され、かつ前記第１の金属環の環状部に対向する環状部とを一体に有する第２の金属環とを備え、
前記第１、第２の両金属環のうち、一方の金属環の環状部には、他方の金属環の環状部に向けて突出する弾性体よりなる軸方向リップが形成され、
前記軸方向リップは、第１、第２のリップ部を有し、
前記環状空間に前記第１、第２の両金属環が組み込まれた初期において、前記第１リップ部は前記他方の金属環の環状部に摺接する一方、前記第２リップ部は前記他方の金属環の環状部に非接触の状態とされ、
前記第１リップ部が所定量摩耗されたときに、前記第２リップ部が前記他方の金属環の環状部に摺接する構成にしてあることを特徴とする密封装置。 A sealing device for sealing an annular space between inner and outer rings that are relatively rotated,
A first metal ring integrally including a cylindrical portion fitted on the outer peripheral surface of the inner ring and an annular portion projecting radially outward from one end of the cylindrical portion;
A cylindrical portion that is fitted into the inner peripheral surface of the outer ring, and an annular portion that protrudes radially inward from one end of the cylindrical portion and that faces the annular portion of the first metal ring are integrated. A second metal ring having
Of the first and second metal rings, the annular part of one metal ring is formed with an axial lip made of an elastic body projecting toward the annular part of the other metal ring,
The axial lip has first and second lip portions;
In the initial stage when the first and second metal rings are incorporated in the annular space, the first lip portion is in sliding contact with the annular portion of the other metal ring, while the second lip portion is the other metal. It is in a non-contact state with the annular portion of the ring,
The sealing device, wherein when the first lip portion is worn by a predetermined amount, the second lip portion is in sliding contact with the annular portion of the other metal ring. 請求項１に記載の密封装置であって、
軸方向リップの第１、第２のリップ部は、共通の根元部を有し、かつこの根元部を弾性変形部として一方の金属環の環状部に一体状に接合されると共に、二股状をなして他方の金属環の環状部に向けて突出していることを特徴とする密封装置。 The sealing device according to claim 1,
The first and second lip portions of the axial lip have a common root portion, and are integrally joined to the annular portion of one metal ring with the root portion as an elastic deformation portion, and have a bifurcated shape. A sealing device characterized by projecting toward the annular portion of the other metal ring.
JP2007084375A 2007-03-28 2007-03-28 Sealing device Pending JP2008240949A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010281379A (en) * 2009-06-04 2010-12-16 Jtekt Corp Sealing device
WO2016143786A1 (en) * 2015-03-09 2016-09-15 Ntn株式会社 Sealed bearing
JP2017155929A (en) * 2015-03-09 2017-09-07 Ntn株式会社 Seal-provided bearing
DE102012211853B4 (en) * 2012-07-06 2020-11-26 Schaeffler Technologies AG & Co. KG Sealing ring with sealing lip decoupling, cassette seal with such a sealing ring and roller bearings with such a sealing ring or such a cassette seal

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Publication number Priority date Publication date Assignee Title
JP2004132519A (en) * 2002-10-15 2004-04-30 Nsk Ltd Seal ring and rolling bearing unit with seal ring
JP2005330987A (en) * 2004-05-18 2005-12-02 Nsk Ltd Sealed rolling bearing and seal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004132519A (en) * 2002-10-15 2004-04-30 Nsk Ltd Seal ring and rolling bearing unit with seal ring
JP2005330987A (en) * 2004-05-18 2005-12-02 Nsk Ltd Sealed rolling bearing and seal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010281379A (en) * 2009-06-04 2010-12-16 Jtekt Corp Sealing device
DE102012211853B4 (en) * 2012-07-06 2020-11-26 Schaeffler Technologies AG & Co. KG Sealing ring with sealing lip decoupling, cassette seal with such a sealing ring and roller bearings with such a sealing ring or such a cassette seal
WO2016143786A1 (en) * 2015-03-09 2016-09-15 Ntn株式会社 Sealed bearing
JP2017155929A (en) * 2015-03-09 2017-09-07 Ntn株式会社 Seal-provided bearing
EP3269989A4 (en) * 2015-03-09 2018-04-18 NTN Corporation Sealed bearing
US10190637B2 (en) 2015-03-09 2019-01-29 Ntn Corporation Sealed bearing assembly

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