JP2010071323A - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
JP2010071323A
JP2010071323A JP2008236544A JP2008236544A JP2010071323A JP 2010071323 A JP2010071323 A JP 2010071323A JP 2008236544 A JP2008236544 A JP 2008236544A JP 2008236544 A JP2008236544 A JP 2008236544A JP 2010071323 A JP2010071323 A JP 2010071323A
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Japan
Prior art keywords
sealing device
lip
dust
hub
outer ring
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JP2008236544A
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Japanese (ja)
Inventor
Naoto Kobayashi
直人 小林
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Nok Corp
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Nok Corp
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Priority to JP2008236544A priority Critical patent/JP2010071323A/en
Publication of JP2010071323A publication Critical patent/JP2010071323A/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
    • F16C33/7873—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 single sealing ring of generally L-shaped cross-section
    • F16C33/7876—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 single sealing ring of generally L-shaped cross-section with sealing lips
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • 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
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/64—Water absorbing
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability in a seal to intrusion of foreign matter such as rainwater, muddy water or dust-dirt from an external part, without increasing sliding bearing pressure in a lip to a dust. <P>SOLUTION: This sealing device includes: a sealing device body 10 sealably fixed to one member 1 among relatively movable two members mutually arranged in a substantially concentric shape and having a plurality of seal lips 13-15 having a tip part slidably brought into close contact with the other member 2; and an annular absorber 20 positioned and arranged between the plurality of seal lips 13-15 and comprising an elastic porous body brought into close contact with both the sealing device body 10 and the other member 2. Greases can also be impregnated into the annular absorber 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、例えば自動車用車輪懸架装置に車輪を回転自在に支持する軸受部など、機器の回転又は往復動部分をシールリップにより密封するものであって、特に泥水条件の厳しい部分の密封に適した密封装置に関するものである。   The present invention seals a rotating or reciprocating part of a device with a seal lip, such as a bearing part that rotatably supports a wheel on a wheel suspension device for automobiles, and is particularly suitable for sealing a part with severe muddy water conditions. The present invention relates to a sealing device.

自動車用車輪懸架装置に車輪を回転自在に支持する軸受部の密封手段として、従来、例えば下記の特許文献１に記載されたような密封装置が知られている。
特開２００８−９５９１９号公報 2. Description of the Related Art Conventionally, for example, a sealing device as described in Patent Document 1 below has been known as a sealing means for a bearing portion that rotatably supports a wheel on an automobile wheel suspension device.
JP 2008-95919 A

図５及び図６は、特許文献１に記載されたものと同種の従来の密封装置を、それぞれ軸心を通る平面で切断して示す装着状態の半断面図である。これら図５及び図６において、参照符号１２０は中心軸部１２２が外輪１１０に挿通され取付フランジ１２１において図示されていない車輪が取り付けられるハブで、図における左側の軸受内部空間Ｓには、円周方向所定間隔で配置された複数の球体１３０が、前記中心軸部１２２の外周面に形成された不図示の軌道と、前記外輪１１０の内周面に形成された不図示の軌道との間で転動自在に保持されており、これらハブ１２０の中心軸部１２２、外輪１１０及び球体１３０によって、軸受ユニットが構成されている。   5 and 6 are half cross-sectional views of a mounting state in which a conventional sealing device of the same type as that described in Patent Document 1 is cut along a plane passing through an axis. 5 and 6, reference numeral 120 denotes a hub in which the central shaft portion 122 is inserted into the outer ring 110 and a wheel (not shown) is attached to the mounting flange 121. The bearing inner space S on the left side in FIG. A plurality of spheres 130 arranged at predetermined intervals in the direction are between a track (not shown) formed on the outer peripheral surface of the central shaft portion 122 and a track (not shown) formed on the inner peripheral surface of the outer ring 110. The bearing unit is constituted by the central shaft portion 122 of the hub 120, the outer ring 110, and the sphere 130.

外輪１１０の外端部の内周面と、ハブ１２０の中心軸部１２２の外周面との間には、密封装置１００が介在されている。この密封装置１００は、外部Ａからの軸受内部空間Ｓへの雨水、泥水あるいは塵埃等の異物が侵入するのを防止すると共に、軸受内部空間Ｓに充填されたグリースが外部Ａへ漏洩するのを防止するものである。   A sealing device 100 is interposed between the inner peripheral surface of the outer end portion of the outer ring 110 and the outer peripheral surface of the central shaft portion 122 of the hub 120. The sealing device 100 prevents foreign matter such as rain water, muddy water, or dust from entering the bearing internal space S from the outside A, and prevents grease filled in the bearing internal space S from leaking to the outside A. It is to prevent.

詳しくは、この密封装置１００は、外輪１１０の内周面に圧入嵌着される金属製の外環１０１と、対ダスト用リップ１０２〜１０４及び対グリース用リップ１０５からなる。対ダスト用リップ１０２〜１０４及び対グリース用リップ１０５は、ゴム材料又はゴム状弾性を有する合成樹脂材料からなるものであって、共通の基部１０６を介して外環１０１に一体的に加硫接着されている。   Specifically, the sealing device 100 includes a metal outer ring 101 that is press-fitted to the inner peripheral surface of the outer ring 110, a dust lip 102 to 104, and a grease lip 105. The dust lip 102 to 104 and the grease lip 105 are made of a rubber material or a synthetic resin material having rubber-like elasticity, and are integrally vulcanized and bonded to the outer ring 101 via a common base 106. Has been.

このうち最も外径側の対ダスト用リップ１０２は、軸受内部空間Ｓと反対側へ開くように延びて、図５に示される例では、先端がハブ１２０の取付フランジ１２１の端面に非接触で近接対向されることによってラビリンスシールを形成しており、図６に示される例では、先端がハブ１２０の取付フランジ１２１の端面に摺動可能に密接されている。   Of these, the outermost-diameter dust lip 102 extends so as to open to the opposite side of the bearing internal space S, and in the example shown in FIG. 5, the tip is not in contact with the end face of the mounting flange 121 of the hub 120. The labyrinth seal is formed by being opposed to each other, and in the example shown in FIG. 6, the tip is slidably in contact with the end face of the mounting flange 121 of the hub 120.

対ダスト用リップ１０２より内側にある他の対ダスト用リップサイドリップ１０３，１０４は、軸受内部空間Ｓと反対側を向いており、対グリース用リップ１０５は、軸受内部空間Ｓ側を向いており、いずれもその先端がハブ１２０の取付フランジ１２１又は中心軸部１２２に摺動可能に密接されている。   The other dust lip side lips 103 and 104 inside the dust lip 102 face the opposite side to the bearing inner space S, and the grease lip 105 faces the bearing inner space S side. In either case, the front end of the hub 120 is slidably in contact with the mounting flange 121 or the central shaft portion 122 of the hub 120.

この種の密封装置１００は、雨天時の車両走行において、ハブ１２０の取付フランジ１２１と外輪１１０との間の隙間Ｇから泥水が流入する過酷な条件で使用されるため、泥水等に対する密封性能の向上を図るには、ハブ１２０に対する対ダスト用リップ１０３，１０４（図６の場合は最も外径側の対ダスト用リップ１０２も含む）の面圧を大きくすることで対応している。しかしながら、リップの面圧を大きくすると、摺動トルクが増大したり、摩耗の進行により早期に密封性が低下したりして、密封装置１００の寿命が短命化してしまう問題がある。また、温度変化によって軸受内部空間Ｓが負圧になると、これによって外部Ａの水が軸受内部空間Ｓへ引きこまれやすくなり、したがって軸受内部空間Ｓへの水の侵入を生じてしまうおそれがあった。   This type of sealing device 100 is used under severe conditions in which muddy water flows from the gap G between the mounting flange 121 of the hub 120 and the outer ring 110 when the vehicle travels in rainy weather. In order to improve, the surface pressure of the lips 103 and 104 for dust against the hub 120 (including the lip 102 for dust on the outermost diameter side in FIG. 6) is increased. However, when the surface pressure of the lip is increased, there is a problem that the sliding torque increases or the sealing performance is deteriorated at an early stage due to the progress of wear, and the life of the sealing device 100 is shortened. Further, when the bearing internal space S becomes negative pressure due to temperature change, the water in the outside A is likely to be drawn into the bearing internal space S, and thus water may enter the bearing internal space S. It was.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、対ダスト用リップの摺動面圧を大きくすることなく、外部からの雨水、泥水あるいは塵埃等の異物の侵入に対するシールの信頼性を向上させることにある。   The present invention has been made in view of the above points, and its technical problem is that it does not increase the sliding surface pressure of the lip for dust, such as rainwater, muddy water, or dust from the outside. It is to improve the reliability of the seal against entry of foreign matter.

上述した技術的課題を有効に解決するための手段として、本発明に係る密封装置は、互いに略同心的に配置されて相対移動可能な二部材のうち一方の部材に密封的に固定されて、先端部が他方の部材に摺動可能に密接される複数のシールリップを有する密封装置本体と、前記複数のシールリップの間に位置して配置され前記密封装置本体と前記他方の部材の双方に密接された弾性を有する多孔体からなる環状吸収体とを備える。   As means for effectively solving the technical problem described above, the sealing device according to the present invention is hermetically fixed to one member of two members that are arranged substantially concentrically and relatively movable, A sealing device main body having a plurality of seal lips whose front end portions are slidably intimately contacted with the other member, and disposed between the plurality of seal lips, both on the sealing device main body and the other member And an annular absorber made of a porous body having close elasticity.

また、上記構成において一層好ましくは、環状吸収体に油脂類を含浸させる。   In the above configuration, the annular absorbent body is more preferably impregnated with fats and oils.

本発明に係る密封装置によれば、複数のシールリップのうち、外側のシールリップを通過した水あるいは泥水は、多孔体からなる環状吸収体に毛細管現象により吸収され保持されるので、その内側のシールリップの摺動部へ前記水あるいは泥水が侵入するのを有効に防止することができる。また、多孔体からなる環状吸収体は摺動面圧が小さいのでトルクの増大を抑えつつ、雨水、泥水あるいは塵埃等の異物の侵入に対するシールの信頼性を向上させることができる。   According to the sealing device according to the present invention, water or muddy water that has passed through the outer seal lip among the plurality of seal lips is absorbed and held by the capillary-like annular absorbent body by capillary action. It is possible to effectively prevent the water or muddy water from entering the sliding portion of the seal lip. In addition, since the annular absorbent body made of a porous body has a small sliding surface pressure, it is possible to improve the reliability of the seal against intrusion of foreign matters such as rainwater, muddy water, and dust while suppressing an increase in torque.

また、あらかじめ環状吸収体に油脂類を含浸させておけば、複数のシールリップのうち、外側のシールリップを通過した水あるいは泥水に対して、環状吸収体に含浸された油脂類が撥水性を奏するため、前記水あるいは泥水がこの環状吸収体をその内側のシールリップ側へ通過するのを有効に防止することができる。   In addition, if the annular absorbent body is impregnated with fats and oils in advance, among the plurality of seal lips, the fats and oils impregnated in the annular absorbent body have water repellency against water or mud that has passed through the outer seal lip. Therefore, it is possible to effectively prevent the water or muddy water from passing through the annular absorbent body toward the inner sealing lip.

以下、本発明に係る密封装置の好ましい実施の形態について、図面を参照しながら説明する。まず図１は、本発明に係る密封装置の第一の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。   Hereinafter, preferred embodiments of a sealing device according to the present invention will be described with reference to the drawings. First, FIG. 1 is a half cross-sectional view showing a state in which a first embodiment of a sealing device according to the present invention is mounted as a sealing means of a bearing portion in a suspension device of a vehicle, cut along a plane passing through an axis.

図１において、参照符号１は外輪、参照符号２は、中心軸部２２が外輪１に挿通され取付フランジ２１において図示されていない車輪が取り付けられるハブ、参照符号３は、外輪１とハブ２の中心軸部２２との間に円周方向に並んで介在された球体で、これら外輪１、ハブ２の中心軸部２２、及び球体３によって、懸架装置の軸受が構成されている。なお、外輪１は請求項１に記載された「一方の部材」に相当し、ハブ２は請求項１に記載された「他方の部材」に相当するものである。   In FIG. 1, reference numeral 1 is an outer ring, reference numeral 2 is a hub in which a central shaft portion 22 is inserted into the outer ring 1 and a wheel (not shown) is attached to a mounting flange 21, and reference numeral 3 is an outer ring 1 and a hub 2. The outer ring 1, the central shaft part 22 of the hub 2, and the spherical body 3 constitute a bearing of the suspension device. The outer ring 1 corresponds to “one member” described in claim 1, and the hub 2 corresponds to “the other member” described in claim 1.

球体３の外側には密封装置４が配置されている。この密封装置４は、外部Ａから球体３が保持された軸受内部空間Ｓへ泥水等が侵入するのを防止するものであって、外輪１に密封的に固定される外環１１と、複数の対ダスト用リップ１２〜１４及び対グリース用リップ１５を有する密封装置本体１０と、最も外側の対ダスト用リップ１２とその内側の対ダスト用リップ１３との間に位置して、密封装置本体１０とハブ２の取付フランジ２１の間に介在される環状吸収体２０とを備える。   A sealing device 4 is disposed outside the sphere 3. The sealing device 4 prevents muddy water or the like from entering the bearing internal space S in which the sphere 3 is held from the outside A, and includes an outer ring 11 that is hermetically fixed to the outer ring 1, and a plurality of The sealing device body 10 having the dust lips 12 to 14 and the grease lip 15, and the outermost dust lip 12 and the dust lip 13 inside the sealing device body 10. And an annular absorbent body 20 interposed between the mounting flanges 21 of the hub 2.

密封装置本体１０における外環１１は、鋼板等の金属板を打ち抜きプレス成形したものであって、外輪１の端部内周面１ａに所定の締め代をもって圧入され密嵌される嵌合筒部１１ａと、その軸受内部空間Ｓ側の一端から内周側へ折り返すように形成された環状の折り返し部１１ｂと、さらにそこから内径側へ屈曲しながら延びる内向きフランジ部１１ｃと、前記嵌合筒部１１ａにおける内向きフランジ部１１ｃと反対側の端部から外径側へ張り出した外向きフランジ部１１ｄからなる。   The outer ring 11 in the sealing device main body 10 is formed by stamping and pressing a metal plate such as a steel plate, and is fitted into the inner peripheral surface 1a of the end portion of the outer ring 1 with a predetermined tightening margin to be fitted tightly. An annular folded portion 11b formed so as to be folded from the one end on the bearing inner space S side to the inner peripheral side, an inward flange portion 11c extending while bending toward the inner diameter side, and the fitting cylinder portion It consists of the outward flange part 11d which protruded to the outer diameter side from the edge part on the opposite side to the inward flange part 11c in 11a.

密封装置本体１０における対ダスト用リップ１２〜１４及び対グリース用リップ１５はゴム材料又はゴム状弾性を有する合成樹脂材料からなるものであって、互いに共通の基部１６を有し、この基部１６が、外環１１の外側面（ハブ２との対向面）を覆うように延びて、この外環１１に一体接合されている。外環１１の外向きフランジ１１ｄにおける対ダスト用リップ１２と反対側の面には、基部１６から連続した固定シール部１７が形成され、外輪１の端面１ｂに適当に圧縮された状態で密接されている。なお、対ダスト用リップ１２〜１４及び対グリース用リップ１５は、請求項１に記載された「複数のシールリップ」に相当する。   The anti-dust lips 12 to 14 and the anti-grease lip 15 in the sealing device body 10 are made of a rubber material or a synthetic resin material having rubber-like elasticity, and have a common base portion 16. The outer ring 11 extends so as to cover the outer surface (the surface facing the hub 2), and is integrally joined to the outer ring 11. A fixed seal portion 17 continuing from the base portion 16 is formed on the surface of the outer flange 11d opposite to the dust lip 12 on the outward flange 11d, and is in close contact with the end surface 1b of the outer ring 1 in an appropriately compressed state. ing. The dust lips 12 to 14 and the grease lip 15 correspond to “a plurality of seal lips” described in claim 1.

密封装置本体１０における最も外径側の対ダスト用リップ１２は、外環１１の外向きフランジ部１１ｄに位置する基部１６の外径端から、先端側が大径となるような円錐筒状をなして延び、その先端部は、軸心に対して略垂直な平面状をなすハブ２の取付フランジ２１に僅かな隙間Ｇを介して軸方向に近接対向している。   The lip 12 for dust on the outermost diameter side in the sealing device main body 10 has a conical cylindrical shape in which the distal end side has a large diameter from the outer diameter end of the base portion 16 located on the outward flange portion 11 d of the outer ring 11. The front end portion of the hub 2 is close to and opposed to the mounting flange 21 of the hub 2 having a planar shape substantially perpendicular to the axial center via a slight gap G.

密封装置本体１０における中段の対ダスト用リップ１３は、外環１１の内向きフランジ部１１ｃに位置する基部１６の中腹部から、先端側が大径となるような円錐筒状をなして延び、軸方向に適当に曲げ変形を受けた状態で、先端部が、軸心に対して略垂直な平面状をなすハブ２の取付フランジ２１に摺動可能に密接されている。   The middle-stage dust lip 13 in the sealing device main body 10 extends from the middle part of the base 16 located in the inward flange portion 11c of the outer ring 11 in a conical cylindrical shape with a large diameter on the tip side. In a state where it is appropriately bent and deformed in the direction, the tip end portion is slidably in close contact with the mounting flange 21 of the hub 2 having a planar shape substantially perpendicular to the axis.

密封装置本体１０における最も内径側の対ダスト用リップ１４は、外環１１の内向きフランジ部１１ｃに位置する基部１６の内径端から、軸受内部空間Ｓと反対側へ向けて略円筒状をなして延び、先端部の内径が、ハブ２の中心軸部２２の外周面に摺動可能に密接されている。   The dust inner lip 14 on the innermost diameter side of the sealing device main body 10 has a substantially cylindrical shape from the inner diameter end of the base portion 16 located in the inward flange portion 11c of the outer ring 11 toward the opposite side to the bearing inner space S. The inner diameter of the tip portion is slidably in close contact with the outer peripheral surface of the central shaft portion 22 of the hub 2.

最も軸受内部空間Ｓ側にある対グリース用リップ１５は、外環１１の内向きフランジ部１１ｃに位置する基部１６の内径端から、最も内径側の対ダスト用リップ１４と反対側へ向いて延び、ハブ２の中心軸部２２の外周面に僅かな締め代をもって摺動可能に密接し、又は僅かな隙間をもって近接対向している。   The grease lip 15 located closest to the bearing inner space S extends from the inner diameter end of the base portion 16 located at the inward flange portion 11c of the outer ring 11 toward the opposite side to the dust lip 14 located closest to the inner diameter side. The hub 2 is slidably in close contact with the outer peripheral surface of the central shaft portion 22 of the hub 2 with a slight tightening margin, or is in close proximity with a slight gap.

すなわち、密封装置本体１０は、所定の金型（不図示）内に、予め所定の接着剤を塗布した外環１１を位置決めセットし、型閉じ状態において外環１１と金型内面との間に画成された環状のキャビティ内に、成形用ゴム又は合成樹脂材料を充填して加熱・加圧することによって、対ダスト用リップ１２〜１４、対グリース用リップ１５、基部１６及び固定シール部１７の成形と同時に、基部１６が外環１１に一体的に接合されたものである。   That is, the sealing device body 10 positions and sets the outer ring 11 previously applied with a predetermined adhesive in a predetermined mold (not shown), and between the outer ring 11 and the inner surface of the mold in the mold closed state. The formed annular cavities are filled with molding rubber or synthetic resin material and heated and pressurized, whereby the lips for dust 12 to 14, the lip for grease 15, the base 16, and the fixed seal portion 17. Simultaneously with the molding, the base portion 16 is integrally joined to the outer ring 11.

環状吸収体２０は、例えば無数の微細な連続気孔を有すると共に、柔軟に伸縮可能な適度の弾性を有する発泡樹脂（いわゆるスポンジ）あるいはフェルト等を環状に成形したものであって、最も外側の対ダスト用リップ１２とその内側の対ダスト用リップ１３との間に位置して、基部１６に密接状態で接着され、取付フランジ２１に摺動可能に密接されている。   The annular absorbent body 20 has, for example, an infinite number of fine continuous pores and is formed by annularly molding a foamed resin (so-called sponge) or felt having moderate elasticity that can be flexibly expanded and contracted. Located between the dust lip 12 and the dust lip 13 on the inside thereof, the dust lip 12 is adhered in close contact with the base 16 and is slidably in close contact with the mounting flange 21.

また、この環状吸収体２０には、あらかじめ油脂類（例えはグリース）を含浸しておくことも好ましい。   The annular absorbent body 20 is preferably impregnated with oils and fats (for example, grease) in advance.

以上の構成を備える第一の形態による密封装置４は、固定シール部１７によって外輪１との間が密封された状態で、外環１１の嵌合筒部１１ａにおいて前記外輪１に圧入嵌着される。そして、対ダスト用リップ１２は先端がハブ２の取付フランジ２１に僅かな隙間Ｇを介して軸方向に近接対向することによってラビリンスシールを構成し、その内側には環状吸収体２０が介在し、更にそれより内側では対ダスト用リップ１３，１４がそれぞれハブ２の取付フランジ２１及び中心軸部２２に密接摺動されることによって、外部Ａから軸受内部空間Ｓへの雨水、泥水あるいは塵埃等の異物が侵入するのを阻止すると共に、対グリース用リップ１５が、ハブ２の中心軸部２２に密接摺動されることによって、軸受内部空間Ｓ内のグリースが外部Ａへ漏洩するのを防止するものである。   The sealing device 4 according to the first embodiment having the above configuration is press-fitted and fitted to the outer ring 1 in the fitting tube portion 11a of the outer ring 11 in a state where the space between the outer ring 1 and the outer seal 1 is sealed by the fixed seal portion 17. The The dust lip 12 forms a labyrinth seal with the tip thereof facing the mounting flange 21 of the hub 2 in the axial direction through a slight gap G, and an annular absorbent body 20 is interposed inside the lip 12 for dust. Further inside, the anti-dust lips 13 and 14 are slid in close contact with the mounting flange 21 and the central shaft portion 22 of the hub 2, respectively, so that rain water, muddy water, dust or the like from the external A to the bearing internal space S can be obtained. The foreign matter is prevented from entering, and the grease lip 15 is closely slid on the central shaft portion 22 of the hub 2 to prevent the grease in the bearing internal space S from leaking to the outside A. Is.

ここで、例えば温度変化によって軸受内部空間Ｓが負圧になると、これによって外部Ａの水が軸受内部空間Ｓへ引きこまれやすくなるが、最も外径側の対ダスト用リップ１２とハブ２の取付フランジ２１との間に形成される隙間Ｇでは、上述のような負圧等により内径側へ侵入しようとする泥水等の運動エネルギが、ラビリンスシール作用によって減衰される。しかも、ハブ２の取付フランジ２１は、これと接触する泥水等に対して遠心力を与えるので、負圧等により隙間Ｇをその内径側へ通過しようとする泥水等は、前記遠心力によって振り切られて外径側へ排除される。   Here, for example, when the bearing internal space S becomes negative due to temperature change, the water in the outside A is easily drawn into the bearing internal space S. However, the dust lip 12 on the outermost diameter side and the hub 2 In the gap G formed between the mounting flange 21 and the kinetic energy such as muddy water trying to enter the inner diameter side due to the negative pressure or the like as described above is attenuated by the labyrinth seal action. In addition, since the mounting flange 21 of the hub 2 gives centrifugal force to the mud and the like in contact therewith, the mud and the like trying to pass through the gap G to the inner diameter side by negative pressure or the like is shaken off by the centrifugal force. To the outside diameter side.

また、外部Ａからの泥水等が、隙間Ｇを通過して対ダスト用リップ１２の内径側へ僅かに侵入しても、この泥水等は、環状吸収体２０に毛細管現象によって吸収され、保持される。しかも、この環状吸収体２０は、泥水中の土粒子を捕捉する濾過作用を有するので、それよりも内径側にある対ダスト用リップ１３，１４とハブ２との摺動部へ、水や塵埃、土粒子などが介入するのを有効に防止することができる。   Further, even if muddy water or the like from the outside A passes through the gap G and slightly enters the inner diameter side of the dust lip 12, the muddy water or the like is absorbed and held in the annular absorbent body 20 by capillary action. The In addition, since the annular absorbent body 20 has a filtering action for capturing the soil particles in the muddy water, water and dust are transferred to the sliding portion between the anti-dust lips 13 and 14 and the hub 2 on the inner diameter side. It is possible to effectively prevent the soil particles from intervening.

また、環状吸収体２０には、あらかじめ油脂類（例えはグリース）を含浸しておいた場合は、環状吸収体２０の連続気孔が油脂類の含浸に塞がれると共に、環状吸収体２０が油脂類によって撥水性を有するものとなるため、対ダスト用リップ１２の内径側へ侵入した泥水等は、環状吸収体２０をその内径側へ通過することができない。とくに、熱によって泥水等から発生した水蒸気も、油脂類が含浸された環状吸収体２０を通過することができないため、水蒸気の状態で水が軸受内部空間Ｓ側へ侵入することも防止される。   Further, when the annular absorbent body 20 is impregnated with oils and fats (for example, grease) in advance, the continuous pores of the annular absorbent body 20 are blocked by the impregnation of the fats and oils, and the annular absorbent body 20 is Since it has water repellency depending on the type, muddy water or the like that has entered the inner diameter side of the lip 12 for dust cannot pass through the annular absorbent body 20 to the inner diameter side. In particular, water vapor generated from muddy water or the like due to heat cannot pass through the annular absorbent body 20 impregnated with fats and oils, so that water can be prevented from entering the bearing internal space S in the state of water vapor.

しかも、この形態によれば、最も外径側の対ダスト用リップ１２が、ハブ２に対して非接触であることに加え、環状吸収体２０は、柔軟に伸縮可能な発泡樹脂あるいはフェルト等からなるものであるため、摺動面圧が小さく、とくに、油脂類を含浸したものは著しく低摩擦となるため、トルクの増大が有効に抑えられる。   Moreover, according to this embodiment, in addition to the outermost side dust lip 12 being in non-contact with the hub 2, the annular absorbent body 20 is made of a foamable resin or felt that can be flexibly expanded and contracted. Therefore, the sliding surface pressure is small, and particularly, those impregnated with fats and oils have extremely low friction, so that an increase in torque can be effectively suppressed.

次に図２は、本発明に係る密封装置の第二の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。   Next, FIG. 2 is a half cross-sectional view showing a state in which the second embodiment of the sealing device according to the present invention is mounted as a sealing means of the bearing portion in the suspension device of the vehicle, cut along a plane passing through the axis. .

この第二の形態において、先に説明した図１に示される第一の形態と異なるところは、最も外径側の対ダスト用リップ１２の先端部が、ハブ２の取付フランジ２１に対して摺動可能に密接されていることにある。その他の部分は図１と同様に構成されている。   In the second embodiment, the difference from the first embodiment shown in FIG. 1 described above is that the tip of the lip 12 for dust on the outermost side slides against the mounting flange 21 of the hub 2. It is in close contact with movement. Other portions are configured in the same manner as in FIG.

したがって、第二の形態の構成によれば、対ダスト用リップ１２を非接触とした第一の形態に比較して、環状吸収体２０側への泥水等の侵入が一層起こりにくくなるが、摺動トルクは、第一の形態よりも大きくなる。   Therefore, according to the configuration of the second embodiment, intrusion of muddy water or the like into the annular absorbent body 20 side is less likely to occur compared to the first embodiment in which the dust lip 12 is not in contact, The dynamic torque is greater than in the first form.

次に図３は、本発明に係る密封装置の第三の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。   Next, FIG. 3 is a half sectional view showing a state in which the third embodiment of the sealing device according to the present invention is mounted as a sealing means of the bearing portion in the suspension device of the vehicle, cut along a plane passing through the shaft center. .

この第三の形態において、先に説明した図１に示される第一の形態と異なるところは、最も内径側にある対ダスト用リップ１４が、先端側が大径となるような円錐筒状をなして延び、その先端部が、ハブ２の取付フランジ２１と中心軸部２２の間の湾曲部２３に摺動可能に密接されていることにある。その他の部分は図１と同様に構成されている。   In the third embodiment, the difference from the first embodiment shown in FIG. 1 described above is that the lip 14 for dust located on the innermost diameter side has a conical cylindrical shape with the tip side having a large diameter. The distal end portion of the hub 2 is in close contact with the curved portion 23 between the mounting flange 21 and the central shaft portion 22 of the hub 2 so as to be slidable. Other portions are configured in the same manner as in FIG.

したがって、第三の形態の構成によれば、基本的には第一の形態と同様の効果が実現され、とくに、最も内径側の対ダスト用リップ１４が湾曲部２３に摺接していることによって、このリップ１４の摺動部でも遠心力による振り切り作用が得られる。   Therefore, according to the configuration of the third embodiment, basically the same effect as that of the first embodiment is realized, and in particular, by the lip 14 for dust on the most inner diameter side being in sliding contact with the curved portion 23. In the sliding portion of the lip 14, a swinging action by centrifugal force can be obtained.

次に図４は、本発明に係る密封装置の第四の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。   Next, FIG. 4 is a half sectional view showing a state in which the fourth embodiment of the sealing device according to the present invention is mounted as a sealing means of the bearing portion in the suspension device of the vehicle, cut along a plane passing through the shaft center. .

この第四の形態は、上述した第三の形態で非接触のラビリンスシールを構成している最も外径側の対ダスト用リップ１２を、第二の形態と同様、ハブ２の取付フランジ２１に対して摺動可能に密接させたものであるため、第二及び第三の形態と同様の効果が実現される。   In the fourth embodiment, the dust lip 12 on the outermost diameter side constituting the non-contact labyrinth seal in the third embodiment described above is attached to the mounting flange 21 of the hub 2 as in the second embodiment. Since it is slidably in close contact with the second embodiment, the same effects as those of the second and third embodiments are realized.

本発明に係る密封装置の第一の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。FIG. 2 is a half cross-sectional view showing a state in which the first embodiment of the sealing device according to the present invention is mounted as a sealing means of a bearing portion in a vehicle suspension device, cut along a plane passing through an axis. 本発明に係る密封装置の第二の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。FIG. 6 is a half sectional view showing a state in which a second embodiment of the sealing device according to the present invention is mounted as a sealing means of a bearing portion in a vehicle suspension device, cut along a plane passing through an axis. 本発明に係る密封装置の第三の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。FIG. 6 is a half sectional view showing a state in which a third embodiment of the sealing device according to the present invention is mounted as a sealing means for a bearing portion in a vehicle suspension device, cut along a plane passing through an axis. 本発明に係る密封装置の第四の形態を、車両の懸架装置における軸受部の密封手段として装着した状態を、軸心を通る平面で切断して示す半断面図である。FIG. 6 is a half sectional view showing a state in which a fourth embodiment of the sealing device according to the present invention is mounted as a sealing means of a bearing portion in a vehicle suspension device, cut along a plane passing through an axis. 従来の密封装置の一例を、軸心を通る平面で切断して示す装着状態の半断面図である。It is a half sectional view of the wearing state which cuts and shows an example of the conventional sealing device by the plane which passes along an axis. 従来の密封装置の他の例を、軸心を通る平面で切断して示す装着状態の半断面図である。It is a half sectional view of the wearing state which cuts and shows other examples of the conventional sealing device by the plane which passes along an axis.

符号の説明Explanation of symbols

１ 外輪（一方の部材）
２ ハブ（他方の部材）
４ 密封装置
１０ 密封装置本体
１１ 外環
１２〜１４ 対ダスト用リップ（シールリップ）
１５ 対グリース用リップ（シールリップ）
２０ 環状吸収体
Ａ 外部
Ｇ 隙間 1 Outer ring (one member)
2 Hub (the other member)
4 Sealing Device 10 Sealing Device Body 11 Outer Ring 12-14 Lip for Dust (Seal Lip)
15 Lip for grease (seal lip)
20 Annular absorber A External G Gap

Claims (2)

互いに略同心的に配置されて相対移動可能な二部材のうち一方の部材に密封的に固定されて、先端部が他方の部材に摺動可能に密接される複数のシールリップを有する密封装置本体と、前記複数のシールリップの間に位置して配置され前記密封装置本体と前記他方の部材の双方に密接された弾性を有する多孔体からなる環状吸収体とを備えることを特徴とする密封装置。   Sealing device body having a plurality of sealing lips that are arranged substantially concentrically with each other and are hermetically fixed to one of two members that can move relative to each other, and whose tip is slidably in contact with the other member And an annular absorbent body made of a porous body that is disposed between the plurality of seal lips and has elasticity close to both the sealing device main body and the other member. . 環状吸収体に油脂類を含浸させたことを特徴とする請求項１に記載の密封装置。   The sealing device according to claim 1, wherein the annular absorbent body is impregnated with fats and oils.
JP2008236544A 2008-09-16 2008-09-16 Sealing device Withdrawn JP2010071323A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130251296A1 (en) * 2012-03-20 2013-09-26 Schaeffler Technologies AG & Co. KG Sealing bearing with compact static outer diameter seal
WO2014091781A1 (en) 2012-12-14 2014-06-19 Nok株式会社 Sealing device
WO2014112137A1 (en) 2013-01-21 2014-07-24 Nok株式会社 Sealing device
WO2016190175A1 (en) * 2015-05-22 2016-12-01 Nok株式会社 Sealing device
CN108027066A (en) * 2015-10-09 2018-05-11 Nok株式会社 Sealing device
JP2020090970A (en) * 2018-12-04 2020-06-11 Nok株式会社 Seal device
CN114144590A (en) * 2019-09-13 2022-03-04 Nok株式会社 Sealing device

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8827563B2 (en) * 2012-03-20 2014-09-09 Schaeffler Technologies Gmbh & Co. Kg Sealing bearing with compact static outer diameter seal
US20130251296A1 (en) * 2012-03-20 2013-09-26 Schaeffler Technologies AG & Co. KG Sealing bearing with compact static outer diameter seal
US9695938B2 (en) 2012-12-14 2017-07-04 Nok Corporation Sealing device
WO2014091781A1 (en) 2012-12-14 2014-06-19 Nok株式会社 Sealing device
WO2014112137A1 (en) 2013-01-21 2014-07-24 Nok株式会社 Sealing device
US9683662B2 (en) 2013-01-21 2017-06-20 Nok Corporation Sealing device
WO2016190175A1 (en) * 2015-05-22 2016-12-01 Nok株式会社 Sealing device
CN107532722A (en) * 2015-05-22 2018-01-02 Nok株式会社 Sealing device
JPWO2016190175A1 (en) * 2015-05-22 2018-02-15 Nok株式会社 Sealing device
CN108027066A (en) * 2015-10-09 2018-05-11 Nok株式会社 Sealing device
US10612597B2 (en) 2015-10-09 2020-04-07 Nok Corporation Sealing apparatus
JP2020090970A (en) * 2018-12-04 2020-06-11 Nok株式会社 Seal device
JP7175170B2 (en) 2018-12-04 2022-11-18 Nok株式会社 sealing device
CN114144590A (en) * 2019-09-13 2022-03-04 Nok株式会社 Sealing device
CN114144590B (en) * 2019-09-13 2024-04-02 Nok株式会社 Sealing device

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