JP4743402B2 - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
JP4743402B2
JP4743402B2 JP2005279528A JP2005279528A JP4743402B2 JP 4743402 B2 JP4743402 B2 JP 4743402B2 JP 2005279528 A JP2005279528 A JP 2005279528A JP 2005279528 A JP2005279528 A JP 2005279528A JP 4743402 B2 JP4743402 B2 JP 4743402B2
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Prior art keywords
sealing device
lip
seal lip
lip member
folded
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JP2007092780A (en
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昌範 柴山
貴子 津野辺
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Uchiyama Manufacturing Corp
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Uchiyama Manufacturing Corp
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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
    • 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
    • F16C19/186—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 with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • 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
    • 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)
  • Rolling Contact Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Description

本発明は、２物体間に介在して空所部をシールする密封装置に関し、詳しくは自動車の車輪懸架部における軸受ユニット等のように、固定側部材と回転側部材との間を密封することが必要とされる部位に介装され、上記部材の一方に弾性摺接するシールリップ部材と、これを固着保持する芯金とよりなる密封装置に関する。   The present invention relates to a sealing device that seals a void portion between two objects, and more specifically, seals between a stationary member and a rotating member such as a bearing unit in a wheel suspension portion of an automobile. The present invention relates to a sealing device comprising a seal lip member interposed in a required portion and elastically slidably contacting one of the above members, and a cored bar for fixing and holding the seal lip member.

上記のような密封装置としては、特許文献１（図１・図２）或いは図６に開示されたものが挙げられる。特許文献１には、外輪の内径面に圧入される圧入部を有し、その圧入部の内端から軸部側へ屈曲した内側部の先端部分が屈曲され、車輪取付け用フランジの隅アール部上に臨む位置に存在し、また圧入部の外端から外輪の外端面に沿って立上がった外側部を有した芯金と、この芯金の外側部の外面の一部分から、内側部の先端に亘る範囲に固着されているシールリップ部材とよりなる密封装置が開示されている（特許文献１・図１参照）。また同じく特許文献１の別の実施形態として、上記芯金の圧入部の先端をその内面に密着させて折返すことにより、折返し部が形成され、その折返し端に内側部が形成された芯金と、上記と同様の構成でなるシールリップ部材とよりなる密封装置が開示されている（特許文献１・図２参照）。   Examples of the sealing device as described above include those disclosed in Patent Document 1 (FIGS. 1 and 2) or FIG. Patent Document 1 has a press-fit portion that is press-fitted into the inner diameter surface of the outer ring, the inner end portion of the press-fit portion that is bent from the inner end to the shaft portion side is bent, and the corner radius portion of the wheel mounting flange is bent. A metal core having an outer part that is present at an upper position and that rises from the outer end of the press-fit part along the outer end surface of the outer ring, and a tip of the inner part from a part of the outer surface of the outer part of the metal core. There is disclosed a sealing device including a seal lip member fixed in a range extending over (see Patent Document 1 and FIG. 1). Further, as another embodiment of Patent Document 1, a cored bar in which a folded part is formed by bringing the tip of the press-fitting part of the cored bar into close contact with the inner surface and folded, and an inner part is formed at the folded end. And a sealing device including a seal lip member having the same configuration as described above is disclosed (see Patent Document 1 and FIG. 2).

次いで図６に示す例は、固定側部材（外輪）２００に嵌合固着され、断面略Ｌ字型でなる２つの部材１００ａ、１００ｂを組み合わせることにより断面略Ｔ字型に構成された芯金１００と、回転側部材（内輪）３００に弾性摺接され、前記２つの部材１００ａ、１００ｂで構成される平面部１００ｃ、１００ｄに跨るように貼着されたシールリップ部材４００とよりなる密封装置Ａを示している。 Next, in the example shown in FIG. 6 , the cored bar 100 is configured to have a substantially T-shaped cross section by combining two members 100 a and 100 b that are fitted and fixed to the stationary member (outer ring) 200 and have a substantially L-shaped cross section. And a sealing device A comprising a sealing lip member 400 that is elastically slidably contacted with the rotation side member (inner ring) 300 and is attached so as to straddle the flat portions 100c and 100d composed of the two members 100a and 100b. Show.

これらの例は、芯金に対するシールリップ部材の固着面積が大きく確保されることから、好ましく採用されている。   These examples are preferably employed because a large fixing area of the seal lip member with respect to the core metal is secured.

実開平７−３４２２４号公報Japanese Utility Model Publication No. 7-34224

しかしながら、これら密封装置はシールリップ部材の固着面積を大きく確保できるものの、特許文献１・図１に開示される例のように芯金の内側部の寸法が大きいものは、製品として出荷する際に、製品を上下に重ねて梱包しようとすると、シールリップ部材が邪魔して重ねられないことが予想される。そこで、密封装置を上下に重ねて出荷できるよう考慮してシール設計すると、該芯金の形状に起因してシールリップ部材（リップ部）の形成位置が制限されてしまい、密封装置において重要なシール設計の自由度が狭くなってしまうという懸念がある。   However, although these sealing devices can secure a large fixing area of the sealing lip member, those having a large inner metal part as in the examples disclosed in Patent Document 1 and FIG. It is expected that the seal lip member will not be stacked due to obstruction when trying to pack products vertically. Therefore, if the seal design is made in consideration of the fact that the sealing device can be shipped vertically, the position of the seal lip member (lip part) is limited due to the shape of the cored bar, which is an important seal in the sealing device. There is a concern that the degree of freedom of design will be narrow.

ところで、従来より芯金とシールリップ部材とは、シールリップ部材がゴム製でなる場合、加硫接着により貼着一体とされるが、特許文献１の図１、図２のように芯金に折返し部があると、この接着工程において、折返し部に接着剤や加硫（加熱）時にゴム材から生じるガスが溜り不良品の発生原因となることがある。また、芯金の脱脂処理工程でこの折返し部に残存してしまった脱脂用処理液が加硫時にガス化して、「ガスぶくれ」を起こし、一部に剥がれが生じるという問題があった。また図６に示す密封装置Ａも、特許文献１・図２と同様のくぼみＢがあるため、ここに接着剤等が溜まるおそれがあるとともに、２部材の組合せで芯金を構成するため、成形の際にずれが生じやすいので寸法公差が大きくなってしまう点、２部材を接着させるという工程を要しコストアップの傾向にあるという点に問題のあるものであった。 By the way, conventionally, when the seal lip member is made of rubber, the core metal and the seal lip member are integrally bonded by vulcanization adhesion. However, as shown in FIGS. If the folded portion is present, in this bonding step, the gas generated from the rubber material at the folded portion during adhesive or vulcanization (heating) may accumulate and cause defective products. Further, there has been a problem that the degreasing treatment liquid remaining in the folded portion in the degreasing treatment step of the core metal is gasified at the time of vulcanization, causing “gas blistering” and partly peeling off. Further, the sealing device A shown in FIG. 6 also has a recess B similar to that of Patent Document 1 and FIG. 2, so that adhesive or the like may accumulate here, and a core metal is formed by a combination of two members. In this case, there is a problem in that the dimensional tolerance is increased because the shift is likely to occur, and the process of adhering two members is required and the cost tends to increase.

本発明は、上記実情に鑑みなされたものであり、簡易な構成でありながら、芯金とシールリップ部材との貼着を強固に一体とでき、優れたシール性と安定した組付性が維持される密封装置を提供することを目的としている。   The present invention has been made in view of the above circumstances, and can be firmly integrated with the cored bar and the seal lip member while having a simple configuration, and maintains excellent sealing performance and stable assembly. It is an object to provide a sealing device.

請求項１の発明に係る密封装置は、２物体間に介在して空所部をシールする弾性材製シールリップ部材と、このシールリップ部材を固着一体に支持する鋼板製芯金とよりなるものであって、上記芯金は、上記２部材の一方の部材に嵌合固着される円筒部と、この円筒部の被密封部位に対して外側に位置する一端部にその径方向へ連成される鍔状部とよりなり、上記鍔状部は、上記一端部から上記径方向へ屈折された後、反屈折方向に折返し形成される２重鍔片と、この２重鍔片を上記反屈折方向へ延出形成される延出鍔片とを備え、上記シールリップ部材は、上記芯金における２重鍔片の折返し部から、延出鍔片の先端側に亘る板面に固着一体とされるとともに、軸方向において前記被密封部位とは反対側に延びるリップ部を複数備え、前記複数のリップ部は、少なくとも前記２重鍔片の前記折返し部から延びるリップ部を含むことを特徴とする。 The sealing device according to the invention of claim 1 is composed of an elastic seal lip member that seals a void portion interposed between two objects, and a steel plate core that supports the seal lip member in an integrated manner. The cored bar is coupled in the radial direction to a cylindrical part fitted and fixed to one of the two members and one end located outside the sealed part of the cylindrical part. The hook-shaped part is refracted from the one end part in the radial direction and then folded back in the anti-refractive direction, and the double hook piece is anti-refracted. The seal lip member is integrally fixed to a plate surface extending from the folded portion of the double collar piece of the core bar to the distal end side of the extension collar piece. that together, a plurality of lips extending to the opposite side to the the sealed portion in the axial direction, the Lip numbers, characterized in that it comprises a lip extending from the folded portion of at least the double flange piece.

本発明においては、請求項２の発明のように、シールリップ部材には、前記２重鍔片の前記折返し部から延びる前記リップ部の他に、径方向において前記円筒部と重ならないように前記リップ部とは間隔を隔ててその他のリップ部が形成されるものとすることができる。また請求項３の発明のように、上記２部材は、軸受ユニットを構成する回転側部材及び固定側部材とすることができる。 In the present invention, as in the invention of claim 2, the seal lip member includes the lip portion extending from the folded portion of the double hook piece so as not to overlap the cylindrical portion in the radial direction. Other lip portions may be formed at a distance from the lip portion . Further, as in the invention of claim 3, the two members can be a rotation side member and a fixed side member constituting the bearing unit.

本発明に係る密封装置によれば、芯金の２重鍔片の折返し部から延出鍔片の先端側に亘る板面にシールリップ部材を貼着するようにしているから、シールリップ部材の貼着面積を大きく確保することができる。特に軸受ユニットにおける回転側部材及び固定側部材の一方の部材に円筒部を嵌合し、当該部材の軸方向端面に２重鍔片が当接するよう取り付けるようにすれば、限られたスペースでありながら、シールリップ部材を貼着するためのスペースを大きく確保することができる。 According to the sealing device of the present invention, the seal lip member is attached to the plate surface extending from the folded portion of the double bar piece of the core bar to the distal end side of the extended bar piece. A large sticking area can be secured. In particular, if the cylindrical portion is fitted to one of the rotation side member and the fixed side member in the bearing unit and the double saddle piece comes into contact with the axial end surface of the member, the space is limited. However, a large space for adhering the seal lip member can be secured.

また、シールリップ部材が芯金に貼着される面は、芯金における２重鍔片の折返し部から、延出鍔片の先端側に亘る板面が、一連に連なる面で形成されるため、加硫成型する場合に生じるガスや接着剤、更には、芯金の脱脂処理時の処理液等が溜まってしまう隙間がないので、シールリップ部材の成型時における熱で発生するガスで、芯金とシールリップ部材との間にガスぶくれが生じたり、接着剤が溜まることがなく、良好に固着一体とすることができ、不良品の発生を抑えることができる。そして密封装置を２部材間に圧入する際に、圧入治具によって押圧される部分の芯金がフラットな面となるから、従来品よりも安定した圧入が可能である。   Further, the surface on which the seal lip member is adhered to the core bar is formed by a continuous surface from the folded portion of the double bar piece to the tip side of the extended bar piece in the core bar. Since there is no gap in which gas or adhesive generated during vulcanization molding, and further, the treatment liquid during the degreasing treatment of the core metal is accumulated, the gas generated by heat during molding of the seal lip member There is no gas blistering between the gold and the seal lip member, and no adhesive is accumulated, and it is possible to satisfactorily fix and integrate, and to suppress the occurrence of defective products. When the sealing device is press-fitted between the two members, the cored bar of the portion pressed by the press-fitting jig becomes a flat surface, so that more stable press-fitting is possible than the conventional product.

更に、２部材の一方の部材に嵌合固着される芯金の円筒部の厚みが小さいため、該密封装置を製品として円筒部を上下に積み重ねるようにして、梱包・出荷をする際に、円筒部の積み重ねのためのスペースを大きく確保する必要がなく、シールリップ部材の設計上の制約を少なくすることができ、設計自由度が大きくなる。   Furthermore, since the thickness of the cylindrical portion of the core metal fitted and fixed to one of the two members is small, the cylindrical portion is stacked up and down using the sealing device as a product, and the cylinder is used when packing and shipping. It is not necessary to secure a large space for stacking the parts, design restrictions on the seal lip member can be reduced, and the degree of freedom in design is increased.

そして２部材を軸受ユニットを構成する回転側部材及び固定側部材にした場合は、軸受ユニットの相対回転部間に装填されたグリースの漏出を防止し、またこの回転部間へ水や塵埃等の浸入を防止することができる。 And if the two members were in the rotary member and the stationary member constituting the bearing unit to prevent leakage of grease loaded between the relative rotation of the bearing unit, also such as water and dust into between the rotating part Intrusion can be prevented.

以下に本発明の最良の実施の形態について、図面に基づいて説明する。図１は、本発明の実施例の密封装置が組込まれた軸受ユニットの例を示す縦断面図、図２は、図１におけるＸ部の拡大図、図３及び図４は同実施例の変形例を示す同様図、図５は本発明の別の実施形態を示す図２と同様の図である。   The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing an example of a bearing unit in which a sealing device of an embodiment of the present invention is incorporated, FIG. 2 is an enlarged view of a portion X in FIG. 1, and FIGS. 3 and 4 are modifications of the embodiment. The same figure which shows an example, FIG. 5 is the same figure as FIG. 2 which shows another embodiment of this invention.

図１は、自動車の車輪を転がり軸受ユニット１により支持する構造の一例を示すものであり、内輪（回転側部材）を構成するハブ２のハブフランジ２ａにボルト３によりタイヤホイール（不図示）が固定される。また、ハブ２に形成されたスプライン軸孔２ｂには、駆動シャフト（不図示）がスプライン嵌合されて、該駆動シャフトの回転駆動力がタイヤホイールに駆動伝達され、ハブ２は内輪部材４と共に内輪を構成し、ハブホイール２ｅとその一端に径方向外向きに連なるハブフランジ２ａとよりなる。外輪（固定側部材）５は、車体の懸架装置（不図示）に取付固定される。この外輪５と上記内輪（ハブ２及び内輪部材４）との間には２列の転動体（玉）６・・がリテーナ６ａで保持された状態で介装され、該転動体６の転動部に装填される潤滑剤（グリース等）の漏出或いは外部からの泥や水等の浸入を防止するための密封装置Ｃ、Ｃ’が外輪５と上記内輪（ハブ２及び内輪部材４）の間に圧入される。両側の密封装置Ｃ、Ｃ’と内輪（ハブ２及び内輪部材４）及び外輪５とにより囲まれた部位が被密封部位Ｓとされる。
なお、ここでは内輪（ハブ２及び内輪部材４）回転、外輪５固定の例を示しているが、これに限らず、内輪固定、外輪回転の軸受機構にも、本願発明は適用可能である。 FIG. 1 shows an example of a structure in which a wheel of an automobile is supported by a rolling bearing unit 1. A tire wheel (not shown) is attached to a hub flange 2 a of a hub 2 constituting an inner ring (rotation side member) by bolts 3. Fixed. A drive shaft (not shown) is spline-fitted into the spline shaft hole 2 b formed in the hub 2, and the rotational driving force of the drive shaft is transmitted to the tire wheel. The hub 2 together with the inner ring member 4 It constitutes an inner ring, and is composed of a hub wheel 2e and a hub flange 2a connected to one end thereof in the radially outward direction. The outer ring (fixed side member) 5 is attached and fixed to a suspension device (not shown) of the vehicle body. Between the outer ring 5 and the inner ring (hub 2 and inner ring member 4), two rows of rolling elements (balls) 6 are interposed while being held by a retainer 6a. Sealing devices C and C ′ for preventing leakage of lubricant (grease, etc.) loaded in the part or intrusion of mud, water, etc. from the outside are between the outer ring 5 and the inner ring (hub 2 and inner ring member 4). It is press-fitted into. A portion surrounded by the sealing devices C and C ′ on both sides, the inner ring (the hub 2 and the inner ring member 4), and the outer ring 5 is a sealed portion S.
Here, an example of rotation of the inner ring (hub 2 and inner ring member 4) and fixing of the outer ring 5 is shown, but the present invention is not limited to this and can be applied to a bearing mechanism of inner ring fixing and outer ring rotation.

図２は、図１のＸ部の拡大図を示し、この密封装置Ｃは反車体側に介装されている。密封装置Ｃは、外輪５の内周に圧入嵌合されるリング状の芯金７と、該芯金７に固着され、ゴム等の弾性材からなる弾性シールリップ部材８とで構成されている。
芯金７は、外輪５の内周に圧入嵌合されるリング状の鋼板部材を折曲げ加工して形成されるもので、外輪５に嵌合固着される円筒部７ａと、この円筒部７ａの被密封部位Ｓに対して外側に位置する一端部にその径方向へ連成される鍔状部７ｂとよりなり、上記鍔状部７ｂは、上記一端部から上記径方向へ屈折された後、反屈折方向に折返し形成される２重鍔片７ｃと、この２重鍔片７ｃを上記反屈折方向へ延出形成される延出鍔片７ｄとを備えている。そしてシールリップ部材８は、芯金７における２重鍔片７ｃの折返し部から、延出鍔片７ｄの先端側に亘る板面に固着一体とされている。 FIG. 2 shows an enlarged view of the portion X in FIG. 1, and the sealing device C is interposed on the side opposite to the vehicle body. The sealing device C includes a ring-shaped cored bar 7 that is press-fitted into the inner periphery of the outer ring 5, and an elastic seal lip member 8 that is fixed to the cored bar 7 and made of an elastic material such as rubber. .
The cored bar 7 is formed by bending a ring-shaped steel plate member that is press-fitted and fitted to the inner periphery of the outer ring 5. A cylindrical part 7 a that is fitted and fixed to the outer ring 5, and this cylindrical part 7 a A flange-like portion 7b that is coupled to the one end located outside the sealed portion S in the radial direction, and the flange-like portion 7b is refracted in the radial direction from the one end. The double rod piece 7c is folded back in the antirefractive direction, and the extended rod piece 7d is formed by extending the double rod piece 7c in the antirefractive direction. The seal lip member 8 is integrally fixed to the plate surface extending from the folded portion of the double collar piece 7c in the metal core 7 to the distal end side of the extended collar piece 7d.

ここで、芯金７は圧延鋼板或いはステンレス鋼板等の金属板製で、板金加工して形成されるが、不錆性のＳＵＳや防錆処理が施された鋼板を用いれば、錆の発生を防ぐことができる。またシールリップ部材８は、ＮＢＲ、Ｈ−ＮＢＲ、ＡＣＭ、ＡＥＭ、ＦＫＭ等を中心とするゴム等の弾性材が採用され、芯金７に対して、これらの弾性材の加硫成型或いは接着剤等により貼着一体される。上記弾性材の他、弾性を有する軟プラスチック類を採用してもよく、これを射出成型し芯金７に接着剤等で貼着するものとしてもよい。   Here, the metal core 7 is made of a metal plate such as a rolled steel plate or a stainless steel plate, and is formed by sheet metal processing. However, if a non-rust SUS or a rust-proof steel plate is used, generation of rust is caused. Can be prevented. The seal lip member 8 is made of an elastic material such as rubber centered on NBR, H-NBR, ACM, AEM, FKM, and the like. It is stuck and united by etc. In addition to the elastic material, soft plastics having elasticity may be used, which may be injection molded and adhered to the core metal 7 with an adhesive or the like.

本発明によれば、特にハブ２におけるハブフランジ２ａに向かって立上がる凹曲面部２ｄと外輪５との間をシールする場合に有効である。なぜなら、芯金７の円筒部７ａを外輪５に嵌合し、外輪５の軸方向端面に２重鍔片７ｃが当接される構造としており、芯金７の２重鍔片７ｃの折返し部から延出鍔片７ｄの先端側に亘る板面にシールリップ部材８を貼着するようにしているので、限られたスペースでありながら、シールリップ部材８を貼着するためのスペースを大きく確保することができるからである。
また本発明によれば、芯金７の２重鍔片７ｃから延出鍔片７ｄへと連なり形成されるシールリップ部材８との貼着面は、一連に形成され、従来の芯金７とシールリップ部材８との貼着面ように、芯金７側に折返し部やくぼみ等がないため、加硫成型する場合に生じるガスや接着剤、更には芯金７の脱脂処理時の処理液等が溜まることがない。よって、シールリップ部材８の成型時における熱で発生するガスで、芯金７とシールリップ部材８との間にガスぶくれが生じることなく、良好に一体固着でき、不良品の発生を抑えることができる。 According to the present invention, it is particularly effective when the gap between the concave curved surface portion 2d rising toward the hub flange 2a of the hub 2 and the outer ring 5 is sealed. This is because the cylindrical portion 7 a of the core metal 7 is fitted to the outer ring 5 and the double collar piece 7 c is brought into contact with the axial end surface of the outer ring 5. Since the seal lip member 8 is adhered to the plate surface extending from the tip of the extending flange piece 7d to the end, a large space for adhering the seal lip member 8 is ensured in a limited space. Because it can be done.
Moreover, according to this invention, the sticking surface with the seal lip member 8 formed continuously from the double collar piece 7c of the metal core 7 to the extended metal piece 7d is formed in series, and the conventional metal core 7 and Since there are no folded portions or depressions on the core metal 7 side as the surface to be bonded to the seal lip member 8, gas and adhesive generated when vulcanization molding is performed, and further, a treatment liquid at the time of degreasing the core metal 7 Etc. do not accumulate. Therefore, gas generated by heat at the time of molding of the seal lip member 8 can be satisfactorily fixed integrally without causing a gas bulge between the metal core 7 and the seal lip member 8, and the occurrence of defective products can be suppressed. Can do.

図例のシールリップ部材８は、リップ部８ａを４つ備えており、夫々のリップ部の先端がハブ２の周面に弾接するようにし、これにより軸受ユニット１の開口端部及び／若しくはその近傍部位を覆うようにして、被密封部位Ｓを密封し、転動体６の転動部に装填される潤滑剤（グリース等）の漏出或いは外部からの泥や水等の浸入を防止している。上述のように、本発明によれば、芯金７に対するシールリップ部材８の貼着面積を大きく確保することができるから、リップ部８ａを上記凹曲面部２ｃの広い範囲に弾接させることができ、優れたシール性を発揮することができる。
なお、リップ部８ａの構成はこれに限定されるものではなく、本発明は、シール設計において、その自由度が大きいものである。すなわち本発明は、外輪５に嵌合固着される芯金７の円筒部７ａの厚みが小さいため、該密封装置Ｃを製品として該円筒部７ａを上下に積み重ねるようにして、梱包・出荷をする際に、円筒部７ａの積み重ねのためのスペースを大きく確保する必要がなく、シールリップ部材８（リップ部８ａ）の設計上の制約を少なくすることができる。 The illustrated seal lip member 8 has four lip portions 8a, and the tip ends of the lip portions are brought into elastic contact with the peripheral surface of the hub 2, whereby the opening end portion of the bearing unit 1 and / or the end portion thereof is arranged. The sealed portion S is sealed so as to cover the vicinity, and leakage of lubricant (grease etc.) loaded in the rolling part of the rolling element 6 or intrusion of mud or water from the outside is prevented. . As described above, according to the present invention, it is possible to secure a large area for attaching the seal lip member 8 to the core metal 7, so that the lip portion 8a can be elastically contacted over a wide range of the concave curved surface portion 2c. And can exhibit excellent sealing properties.
In addition, the structure of the lip | rip part 8a is not limited to this, This invention has a large freedom degree in seal design. That is, according to the present invention, since the cylindrical portion 7a of the core 7 fitted and fixed to the outer ring 5 has a small thickness, the cylindrical portion 7a is stacked up and down using the sealing device C as a product for packing and shipping. At this time, it is not necessary to secure a large space for stacking the cylindrical portions 7a, and design restrictions on the seal lip member 8 (lip portion 8a) can be reduced.

図３、図４は同実施例の変形例で、３つのリップ部８ａを備えたシールリップ部材８の例を示しており、いずれも外輪５の内周に芯金７が固着された状態を示している。
図３はハブフランジ２ａの周面２ｃに弾接されるリップ部８ａをひとつにし、ハブフランジ２ａからハブホイール２ｅへと連成される凹曲面部２ｄに弾接するリップ部８ａ、ハブホイール２ｅの周面に弾接するリップ部８ａを備えた例であり、図４はハブフランジ２ａの周面２ｃに弾接されるリップ部８ａをふたつにし、凹曲面部２ｄに弾接するリップ部８ａを備えていない例である。これらの例も芯金７の構成は図２の例と同様であり、その他の構成及び作用は上記例と同様であるので、共通部分には同一の符号を付し、その説明を割愛する。 3 and 4 show modifications of the embodiment, showing an example of a seal lip member 8 having three lip portions 8a, both of which show a state in which the core metal 7 is fixed to the inner periphery of the outer ring 5. Show.
FIG. 3 shows a lip portion 8a elastically contacted with the peripheral surface 2c of the hub flange 2a. The lip portion 8a elastically contacts the concave curved surface portion 2d coupled from the hub flange 2a to the hub wheel 2e. FIG. 4 shows an example in which a lip portion 8a elastically contacting the peripheral surface is provided. FIG. 4 includes two lip portions 8a elastically contacting the peripheral surface 2c of the hub flange 2a and a lip portion 8a elastically contacting the concave curved surface portion 2d. There is no example. In these examples as well, the configuration of the cored bar 7 is the same as that of the example of FIG. 2, and the other configurations and operations are the same as those of the above example.

図５は、上述の実施例１とは異なる実施形態を示した図１のＸ部の拡大図であり、この密封装置Ｃは反車体側に介装されているものである。
密封装置Ｃは、外輪５の内周に圧入嵌合されるリング状の芯金７と、該芯金７に固着され、ゴム等の弾性材からなる弾性シールリップ部材８とで構成されている。芯金７は、外輪５の内周に圧入嵌合されるリング状の鋼板部材を折曲げ加工して形成されるもので、外輪５に嵌合固着される円筒部７ａと、この円筒部７ａの被密封部位Ｓに対して外側に位置する一端部にその径方向へ連成される鍔状部７ｂとよりなり、上記鍔状部７ｂは、上記一端部から上記径方向へ屈折された後、反屈折方向に折返し形成される２重鍔片７ｃと、この２重鍔片７ｃを上記反屈折方向へ延出形成される延出鍔片７ｄとを備えている点は上記実施例１と同様であるが、本実施例のシールリップ部材８は、芯金７における２重鍔片７ｃの折返し部から、延出鍔片７ｄの先端側に亘る板面に固着一体とされ、且つ２重鍔片７ｃを覆うように２重鍔片７ｃの外輪５側にもシールリップ部材がまわり込むように形成される芯金覆い部８ｂを備えている点で異なるものである。 FIG. 5 is an enlarged view of a portion X in FIG. 1 showing an embodiment different from the above-described Example 1, and the sealing device C is interposed on the side opposite to the vehicle body.
The sealing device C includes a ring-shaped cored bar 7 that is press-fitted into the inner periphery of the outer ring 5, and an elastic seal lip member 8 that is fixed to the cored bar 7 and made of an elastic material such as rubber. . The cored bar 7 is formed by bending a ring-shaped steel plate member that is press-fitted and fitted to the inner periphery of the outer ring 5. A cylindrical part 7 a that is fitted and fixed to the outer ring 5, and this cylindrical part 7 a A flange-like portion 7b that is coupled to the one end located outside the sealed portion S in the radial direction, and the flange-like portion 7b is refracted in the radial direction from the one end. The second embodiment is the same as the first embodiment in that it includes a double rod piece 7c that is folded back in the antirefractive direction and an extended rod piece 7d that is formed by extending the double rod piece 7c in the antirefractive direction. Similarly, the seal lip member 8 of the present embodiment is integrally fixed to the plate surface extending from the folded portion of the double collar piece 7c in the core metal 7 to the distal end side of the extended collar piece 7d, and is double-layered. A cored bar covering portion formed so that the seal lip member also wraps around the outer ring 5 side of the double collar piece 7c so as to cover the collar piece 7c. It is different in that it has a b.

これによれば、実施例１と同様にシールリップ部材８の貼着面積を大きく確保することができるとともに、芯金７と当接する部材（ここでは外輪５）との間のシール性がより一層向上するので、外部からの水や塵埃等の浸入を防止でき、芯金７の錆発生が抑制できる。
ここでは図示していないが、実施例１の変形例として示す例（図３、図４）のように、リップ部８ａの構成は４つに限定されず、３つとしてもよく、ハブフランジ２ａの周面２ｃに弾接されるリップ部８ａをひとつにし、ハブフランジ２ａからハブホイール２ｅへと連成され凹曲面部２ｄに弾接されるリップ部８ａ、ハブホイール２ｅの周面に弾接されるリップ部８ａを備えるもの、又はハブフランジ２ａの周面２ｃに弾接されるリップ部８ａをふたつにし、凹曲面部２ｄに弾接するリップ部８ａを備えていないものとしてもよい。 According to this, similarly to the first embodiment, a large sticking area of the seal lip member 8 can be secured, and the sealability between the member (here, the outer ring 5) that contacts the core metal 7 is further increased. Since it improves, intrusion of water, dust, etc. from the outside can be prevented, and rust generation of the cored bar 7 can be suppressed.
Although not shown here, the configuration of the lip portion 8a is not limited to four as in the example (FIGS. 3 and 4) shown as a modification of the first embodiment, and may be three, and the hub flange 2a. The lip portion 8a elastically contacted with the peripheral surface 2c of the rim portion 8a is formed into one, the lip portion 8a coupled from the hub flange 2a to the hub wheel 2e and elastically contacted with the concave curved surface portion 2d, and elastically contacted with the peripheral surface of the hub wheel 2e The lip portion 8a may be provided, or the lip portion 8a elastically contacted with the peripheral surface 2c of the hub flange 2a may be two, and the lip portion 8a elastically contacted with the concave curved surface portion 2d may not be provided.

尚、本発明の密封装置の形状は上記実施例に限定されず、密封装置Ｃ’にも適用可能であることは言うまでもない。また適用例についても上記実施例に限定されず、２部材間に介在し空所部をシールするものであればよく、その他の軸受、軸受ユニットにも本発明が適用可能である。   Needless to say, the shape of the sealing device of the present invention is not limited to the above-described embodiment, but can also be applied to the sealing device C '. Further, the application example is not limited to the above-described embodiment, and any application may be used as long as it is interposed between two members and seals a void portion, and the present invention can be applied to other bearings and bearing units.

本発明の密封装置が組込まれた軸受ユニットの例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the example of the bearing unit in which the sealing device of this invention was integrated. 図１におけるＸ部の拡大図である。It is an enlarged view of the X section in FIG. 図２の変形例を示す同様図である。It is the same figure which shows the modification of FIG. 図２の変形例を示す同様図である。It is the same figure which shows the modification of FIG. 本発明の別の実施形態の図２と同様の図である。It is a figure similar to FIG. 2 of another embodiment of this invention. 従来の密封装置の一例を示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows an example of the conventional sealing device.

符号の説明Explanation of symbols

Ｃ（Ｃ’）密封装置
Ｓ 被密封部位
７ 芯金
７ａ 円筒部
７ｂ 鍔状部
７ｃ ２重鍔片
７ｄ 延出鍔片
８ シールリップ部材
８ａ リップ部 C (C ′) Sealing Device S Sealed Part 7 Core Bar 7a Cylindrical Part 7b Cage-like Part 7c Double Cage Piece 7d Extending Cage Piece 8 Seal Lip Member 8a Lip Part

Claims (3)

２物体間に介在して空所部をシールする弾性材製シールリップ部材と、このシールリップ部材を固着一体に支持する鋼板製芯金とよりなる密封装置であって、
上記芯金は、上記２部材の一方の部材に嵌合固着される円筒部と、この円筒部の被密封部位に対して外側に位置する一端部にその径方向へ連成される鍔状部とよりなり、上記鍔状部は、上記一端部から上記径方向へ屈折された後、反屈折方向に折返し形成される２重鍔片と、この２重鍔片を上記反屈折方向へ延出形成される延出鍔片とを備え、上記シールリップ部材は、上記芯金における２重鍔片の折返し部から、延出鍔片の先端側に亘る板面に固着一体とされるとともに、軸方向において前記被密封部位とは反対側に延びるリップ部を複数備え、
前記複数のリップ部は、少なくとも前記２重鍔片の前記折返し部から延びるリップ部を含むことを特徴とする密封装置。 A sealing device comprising a seal lip member made of an elastic material interposed between two objects and sealing a void portion, and a steel plate core that supports the seal lip member in an integrated manner,
The cored bar includes a cylindrical portion that is fitted and fixed to one of the two members, and a flange-shaped portion that is coupled in the radial direction to one end located outside the sealed portion of the cylindrical portion. The hook-shaped portion is refracted in the radial direction from the one end portion, and is then folded back in the anti-refractive direction, and the double hook piece extends in the anti-refractive direction. The seal lip member is integrally fixed to a plate surface extending from the folded portion of the double rod piece of the core bar to the tip side of the extension rod piece, and the shaft A plurality of lip portions extending in the direction opposite to the sealed portion,
The plurality of lip portions include at least a lip portion extending from the folded portion of the double hook piece . 請求項１記載の密封装置において、
上記シールリップ部材には、前記２重鍔片の前記折返し部から延びる前記リップ部の他に、径方向において前記円筒部と重ならないように前記リップ部とは間隔を隔ててその他のリップ部が形成されることを特徴とする密封装置。 The sealing device according to claim 1.
In addition to the lip portion extending from the folded portion of the double hook piece, the seal lip member has other lip portions spaced apart from the lip portion so as not to overlap the cylindrical portion in the radial direction. a sealing device characterized in that it is formed. 請求項１又は請求項２に記載の密封装置において、
上記２部材は、軸受ユニットを構成する回転側部材及び固定側部材であることを特徴とする密封装置。 The sealing device according to claim 1 or 2,
2. The sealing device according to claim 2, wherein the two members are a rotation side member and a fixed side member constituting the bearing unit.
JP2005279528A 2005-09-27 2005-09-27 Sealing device Expired - Fee Related JP4743402B2 (en)

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