JP6670548B2

JP6670548B2 - Sealing device

Info

Publication number: JP6670548B2
Application number: JP2015053938A
Authority: JP
Inventors: 孝明上池
Original assignee: Uchiyama Manufacturing Corp
Current assignee: Uchiyama Manufacturing Corp
Priority date: 2015-03-17
Filing date: 2015-03-17
Publication date: 2020-03-25
Anticipated expiration: 2035-03-17
Also published as: JP2016173161A

Description

本発明は、相対的に同軸回転する内側部材及び外側部材からなる２部材間に形成される被密封空間を密封する密封装置に関し、例えば、自動車用車輪の軸受装置に装着されるキャップやベアリングシールに関する。 The present invention relates to a sealing device for sealing a sealed space formed between two members, an inner member and an outer member, which rotate relatively coaxially. For example, a cap or a bearing seal mounted on a bearing device of an automobile wheel About.

自動車用車輪の軸受装置には、外側部材としての外輪に嵌合されて、外輪の軸方向端部の開口部を封止するキャップや、外輪と内側部材としての内輪との間の環状空間を封止するベアリングシール等の密封装置が用いられる。これらの密封装置は、基本的には芯金と該芯金に固着された弾性体製のシール部材とにより構成され、芯金は外輪に嵌合される円筒部を有する。芯金の円筒部は外輪の内径面に嵌合されていたが、外輪と内輪との間のスペース的な制約や、外輪の軸方向端面の発錆を抑えることが好ましいことから、外輪の軸方向端面を密着的に覆い、且つ、円筒部を外輪の外径面に嵌合するようにした構造の芯金も採用されるようになった（例えば、特許文献１参照）。また、外輪の軸方向端面を覆う部分を有さないが、外輪の外径面に嵌合する円筒部と、この円筒部に固着されてハブフランジに弾接するシールリップとを有する密封装置（外部シール）も用いられるようになった（例えば、特許文献２参照）。 In a bearing device for an automobile wheel, a cap which is fitted to an outer ring as an outer member and seals an opening at an axial end of the outer ring, and an annular space between the outer ring and an inner ring as an inner member are formed. A sealing device such as a bearing seal for sealing is used. These sealing devices are basically composed of a cored bar and a sealing member made of an elastic body fixed to the cored bar, and the cored bar has a cylindrical portion fitted to the outer ring. Although the cylindrical portion of the core was fitted to the inner diameter surface of the outer ring, it is preferable to suppress rust on the axial end surface of the outer ring because of space restrictions between the outer ring and the inner ring. A core metal having a structure in which the end face in the direction is closely covered and the cylindrical portion is fitted to the outer diameter surface of the outer ring has been adopted (for example, see Patent Document 1). A sealing device (external) which does not have a portion covering the axial end surface of the outer ring, but has a cylindrical portion fitted to the outer diameter surface of the outer ring, and a seal lip fixed to the cylindrical portion and elastically contacting the hub flange. Seals) have also been used (for example, see Patent Document 2).

特開２０１１−１１６１７１号公報JP 2011-116171 A 特許第５４１４９６４号公報Japanese Patent No. 5414964

ところで、前記のような構造の芯金において、芯金の円筒部と外輪とは、嵌合力を確保するため所定の締め代をもって嵌合される。そのため、外輪を芯金の円筒部に圧入させる際、嵌合圧によって円筒部の外輪に対する嵌合方向の先側が押し広げられて拡開することがある。このように、円筒部が拡開すると外輪に対する嵌合力が弱くなり、また、嵌合部に泥水等が浸入して嵌合面が発錆する事態も生じる。特許文献１では、円筒部の前記先側に外径方向に延びる外向きの鍔状部（堰部）が設けられた例が示されている。円筒部にこのような鍔状部を設けると、前記のような円筒部の嵌合時における拡開が抑制されると解される。また、特許文献１では、芯金の表面をゴムからなる被覆部で覆うようにした例も記載されている。しかし、この被覆部が円筒部と外輪との嵌合部に及んでいるか否かの記載がなく、そのため、鍔状部が設けられてはいても、なお円筒部の前記先側に若干の拡開が生じた場合、この拡開部分から泥水等が嵌合部に浸入する懸念はなお完全に払拭されないものと考えられる。 By the way, in the metal core having the above-described structure, the cylindrical portion of the metal core and the outer ring are fitted with a predetermined interference in order to secure a fitting force. Therefore, when the outer ring is press-fitted into the cylindrical portion of the core bar, the front end of the cylindrical portion in the fitting direction with respect to the outer ring may be expanded by the fitting pressure. As described above, when the cylindrical portion is expanded, the fitting force with respect to the outer ring is weakened, and muddy water or the like may enter the fitting portion and rust the fitting surface. Patent Literature 1 discloses an example in which an outward flange (a dam portion) extending in an outer diameter direction is provided on the front side of the cylindrical portion. It is understood that providing such a flange portion on the cylindrical portion suppresses the expansion at the time of fitting the cylindrical portion as described above. Patent Document 1 also discloses an example in which the surface of a cored bar is covered with a covering portion made of rubber. However, there is no description as to whether or not the covering portion extends to the fitting portion between the cylindrical portion and the outer ring. Therefore, even if the flange portion is provided, it is still slightly enlarged on the front side of the cylindrical portion. When the opening occurs, it is considered that the concern that muddy water or the like intrudes into the fitting portion from the expanded portion is still not completely wiped out.

特許文献２には、前記のような円筒部の拡開を防止するため、円筒部の前記先側に屈曲部や重合部を設けることが記載されている。しかし、円筒部と外輪との嵌合部に対する泥水等の浸入を防止するための構造の記載はない。特に、円筒部と外輪との嵌合は金属同士の嵌合であるため、嵌合部への泥水等の浸入は避けられない。加えて、前記のように外輪の軸方向端面は芯金によって覆われていないので、この部分の発錆防止のニーズには充分に応えられないものと考えられる。 Patent Literature 2 discloses that a bent portion or an overlapping portion is provided on the front side of the cylindrical portion in order to prevent the cylindrical portion from expanding as described above. However, there is no description of a structure for preventing intrusion of muddy water or the like into a fitting portion between the cylindrical portion and the outer ring. In particular, since the fitting between the cylindrical portion and the outer ring is a fitting between metals, intrusion of muddy water or the like into the fitting portion cannot be avoided. In addition, since the axial end face of the outer ring is not covered with the core metal as described above, it is considered that the need for preventing rusting of this portion cannot be sufficiently satisfied.

本発明は、上記実情に鑑みなされたもので、外側部材の外径面に芯金の円筒部を嵌合させるようにした密封装置において、外側部材に対する嵌合の際の円筒部の拡開を抑制し、且つ、外側部材と円筒部との嵌合部分の密封性を向上させることができ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 in a sealing device in which a cylindrical portion of a cored bar is fitted to an outer diameter surface of an outer member, the expansion of the cylindrical portion when fitting to the outer member is performed. It is an object of the present invention to provide a sealing device capable of suppressing and improving the sealing performance of a fitting portion between an outer member and a cylindrical portion.

本発明に係る密封装置は、相対的に同軸回転する内側部材及び外側部材からなる２部材間に形成される被密封空間を密封する密封装置であって、前記外側部材に嵌合される芯金及び該芯金と前記外側部材との間を密封するシール部材を備え、前記芯金は、前記外側部材の外径面に嵌合される円筒部と、該円筒部の一端部から内径側に延びて前記外側部材の軸方向端面を覆う内向鍔状部と、前記円筒部の他端部から外径側に屈曲する屈曲部とを備え、前記シール部材は、前記円筒部と前記外側部材との嵌合部分において前記円筒部と外側部材の外径面との間に介在するよう構成され、前記屈曲部は、前記円筒部の他端部から外径方向に延びる外向鍔状部で構成され、前記外向鍔状部の径方向長さは、前記円筒部の軸方向長さの２分の１以上とされており、前記シール部材は、ゴム材からなり、前記円筒部の他端部における前記外側部材との嵌合部分において内径側に突出する環状突部を有し、当該環状突部が前記円筒部と外側部材の外径面との間に圧縮された状態で介在し、前記環状突部の突出量を前記円筒部の拡開による変形量以上且つ０．１ｍｍ以下とすることを特徴とする。 A sealing device according to the present invention is a sealing device for sealing a sealed space formed between two members, an inner member and an outer member, which rotate relatively coaxially, and a core bar fitted to the outer member. And a sealing member for sealing between the core and the outer member, wherein the core is a cylindrical portion fitted to an outer diameter surface of the outer member, and from one end of the cylindrical portion to the inner side. An inward flange-shaped portion that extends to cover the axial end surface of the outer member, and a bent portion that bends toward the outer diameter side from the other end of the cylindrical portion, wherein the seal member includes the cylindrical portion and the outer member. The fitting portion is configured to be interposed between the cylindrical portion and the outer diameter surface of the outer member, and the bent portion is formed by an outward flange-shaped portion extending in the outer diameter direction from the other end of the cylindrical portion. The radial length of the outward flange is at least half the axial length of the cylindrical portion. And, wherein the sealing member is made of rubber material, it has an annular projection which projects radially inwardly at the fitting portion between the outer member at the other end of the cylindrical portion, the annular protruding portion is the cylindrical portion And an outer diameter surface of the outer member in a compressed state, and a protrusion amount of the annular protrusion is set to be equal to or more than a deformation amount due to expansion of the cylindrical portion and equal to or less than 0.1 mm .

本発明によれば、芯金の円筒部は、外側部材の外径面に嵌合され、この嵌合の際には、円筒部の一端部から内径側に延びる内向鍔状部が外側部材の軸方向端面を覆うから、この端面が泥水等に直接晒されることがなく、この部分の発錆が抑えられる。また、円筒部の他端部には外径側に屈曲する屈曲部を有しているから、円筒部の他端部はこの屈曲部によって補強され、円筒部を外側部材の外径面に嵌合する際の円筒部の拡開が抑制される。外側部材に対する円筒部の嵌合状態では、シール部材が円筒部と外側部材の外径面との間に介在するから、外側部材と円筒部との嵌合部への泥水等の浸入が抑えられる。これによって、円筒部と外側部材との嵌合部の発錆が抑制される。 According to the present invention, the cylindrical portion of the cored bar is fitted to the outer diameter surface of the outer member, and at this time, the inward flange portion extending from one end of the cylindrical portion to the inner diameter side is formed as the outer member. Since the end face in the axial direction is covered, the end face is not directly exposed to muddy water and the like, and rusting at this portion is suppressed. In addition, since the other end of the cylindrical portion has a bent portion that is bent to the outer diameter side, the other end of the cylindrical portion is reinforced by the bent portion, and the cylindrical portion is fitted on the outer diameter surface of the outer member. The expansion of the cylindrical portion at the time of joining is suppressed. In the state where the cylindrical portion is fitted to the outer member, since the seal member is interposed between the cylindrical portion and the outer diameter surface of the outer member, infiltration of muddy water or the like into the fitting portion between the outer member and the cylindrical portion is suppressed. . Thereby, rusting of the fitting portion between the cylindrical portion and the outer member is suppressed.

また本発明の密封装置によれば、前記屈曲部は、前記円筒部の他端部から外径方向に延びる外向鍔状部で構成されているので、屈曲部が外向鍔状部によって構成されているから、円筒部の他端部における補強機能がより発揮され、円筒部の外側部材に対する嵌合の際の円筒部の拡開がより効果的に抑制される。
さらに本発明の密封装置によれば、前記外向鍔状部の径方向長さが、前記円筒部の軸方向長さの２分の１以上とされていることにより、外向鍔状部の前記補強機能が的確に発揮される。前記外向鍔状部の径方向長さが、円筒部の軸方向長さの２分の１より小さくなると、前記補強機能が低下して円筒部の前記拡開変形量が増大する傾向となる。
この場合、前記芯金は、前記外向鍔状部の外径側端部から、前記円筒部の外径側に位置するように延出された筒状の折返し部をさらに有しているものとしても良い。
これによれば、外向鍔状部の外径側端部から筒状の折返し部がさらに延出されることにより、前記補強機能がより一層発揮され、円筒部の外側部材に対する嵌合の際の円筒部の拡開がより一層効果的に抑制される。
そして、本発明の密封装置は、前記シール部材は、ゴム材からなり、前記円筒部の他端部における前記外側部材との嵌合部分において内径側に突出する環状突部を有し、当該環状突部が前記円筒部と外側部材の外径面との間に圧縮された状態で介在するように構成されている。
これによれば、外側部材に対する円筒部の嵌合状態では、シール部材の環状突部が円筒部と外側部分の外径面との間に圧縮された状態で介在するから、外側部材と円筒部との嵌合部への泥水等の浸入が抑えられる。特に、環状突部は円筒部の他端部における前記外側部材との嵌合部分に設けられているから、嵌合の際に円筒部の他端部が多少拡開しても、前記圧縮された状態の介在が維持され、この部分の泥水等の浸入防止機能が低下する懸念がない。また、シール部材がゴム材からなるから、加硫成型によって芯金の円筒部に対して簡易に一体とすることができる。 Further, according to the sealing device of the present invention, since the bent portion is formed by the outward flange portion extending in the outer radial direction from the other end portion of the cylindrical portion, the bent portion is formed by the outward flange portion. Therefore, the reinforcing function at the other end of the cylindrical portion is more exerted, and the expansion of the cylindrical portion when the cylindrical portion is fitted to the outer member is more effectively suppressed.
Further, according to the sealing device of the present invention, since the radial length of the outward flange is set to be not less than half the axial length of the cylindrical portion, the reinforcement of the outward flange can be achieved. Function is exhibited properly. When the radial length of the outward flange-shaped portion is smaller than half the axial length of the cylindrical portion, the reinforcing function tends to be reduced, and the amount of expansion deformation of the cylindrical portion tends to increase.
In this case, the core metal may further include a cylindrical folded portion extending from the outer diameter side end of the outward flange portion so as to be positioned on the outer diameter side of the cylindrical portion. Is also good.
According to this, since the cylindrical folded portion is further extended from the outer diameter side end portion of the outward flange-shaped portion, the reinforcing function is further exerted, and the cylindrical portion at the time of fitting to the outer member of the cylindrical portion is formed. The expansion of the portion is more effectively suppressed.
And the sealing device of the present invention is such that the sealing member is made of a rubber material, and has an annular projection projecting toward the inner diameter side at a fitting portion with the outer member at the other end of the cylindrical portion. The projection is configured to be interposed between the cylindrical portion and the outer diameter surface of the outer member in a compressed state.
According to this, when the cylindrical portion is fitted to the outer member, the annular projection of the seal member is interposed in a compressed state between the cylindrical portion and the outer diameter surface of the outer portion. Infiltration of muddy water and the like into the fitting portion with the above is suppressed. In particular, since the annular protrusion is provided at the other end of the cylindrical portion at the fitting portion with the outer member, even if the other end of the cylindrical portion is slightly expanded at the time of fitting, the annular projection is compressed. There is no concern that the function of preventing intrusion of muddy water or the like in this part is reduced. Further, since the sealing member is made of a rubber material, it can be easily integrated with the cylindrical portion of the core by vulcanization molding.

本発明に係る密封装置は、相対的に同軸回転する内側部材及び外側部材からなる２部材間に形成される被密封空間を密封する密封装置であって、前記外側部材に嵌合される芯金及び該芯金と前記外側部材との間を密封するシール部材を備え、前記芯金は、前記外側部材の外径面に嵌合される円筒部と、該円筒部の一端部から内径側に延びて前記外側部材の軸方向端面を覆う内向鍔状部と、前記円筒部の他端部から外径側に屈曲する屈曲部とを備え、前記シール部材は、前記円筒部と前記外側部材との嵌合部分において前記円筒部と外側部材の外径面との間に介在するよう構成され、前記屈曲部は、前記円筒部の他端部から前記円筒部に重なるように折り返された重合部で構成されていることを特徴とする。
本発明によれば、屈曲部が円筒部に重なるように折り返された重合部で構成されているから、前記補強機能がより発揮され、円筒部の外側部材に対する嵌合の際の円筒部の拡開がより効果的に抑制される。 A sealing device according to the present invention is a sealing device for sealing a sealed space formed between two members, an inner member and an outer member, which rotate relatively coaxially, and a core bar fitted to the outer member. And a sealing member for sealing between the core and the outer member, wherein the core is a cylindrical portion fitted to an outer diameter surface of the outer member, and from one end of the cylindrical portion to the inner side. An inward flange-shaped portion that extends to cover the axial end surface of the outer member, and a bent portion that bends toward the outer diameter side from the other end of the cylindrical portion, wherein the seal member includes the cylindrical portion and the outer member. The bending portion is configured to be interposed between the cylindrical portion and the outer diameter surface of the outer member at the fitting portion, and the bent portion is folded back from the other end of the cylindrical portion so as to overlap the cylindrical portion. It is characterized by comprising.
According to the present invention , since the bent portion is constituted by the overlapped portion that is folded back so as to overlap the cylindrical portion, the reinforcing function is more exhibited, and the cylindrical portion expands when fitted to the outer member of the cylindrical portion. Opening is more effectively suppressed.

本発明の密封装置において、前記シール部材は、液状ガスケットからなるものとしても良い。或いは、前記シール部材は接着剤からなるものとしても良い。
液状ガスケットや接着剤は粘性があるから、芯金の円筒部と外側部材との嵌合部に事前に塗布しておけば、嵌合の際に円筒部の他端部が多少拡開しても、嵌合部に滞留し、この部分の泥水等の浸入防止機能が低下する懸念がない。 In the sealing device of the present invention, the seal member may be formed of a liquid gasket. Alternatively, the seal member may be made of an adhesive.
Since the liquid gasket and adhesive are viscous, if they are applied in advance to the fitting part between the cylindrical part of the metal core and the outer member, the other end of the cylindrical part will expand slightly when fitting. Also, there is no danger of staying in the fitting portion and reducing the function of preventing muddy water or the like from entering this portion.

本発明の密封装置において、前記芯金は、前記内向鍔状部を含むキャップ本体部を有し、前記円筒部を前記外側部材に嵌合することによって、前記外側部材の端面側開口部を封止するキャップを構成するものとしても良い。
これによれば、外側部材の端面側開口部が封止されるから、内側部材及び外側部材からなる２部材間に形成される被密封空間が的確に密封される。 In the sealing device according to the aspect of the invention, the core has a cap body including the inward flange portion, and the cylindrical portion is fitted to the outer member to seal an end surface side opening of the outer member. It is good also as what comprises a cap which stops.
According to this, since the end face side opening of the outer member is sealed, the sealed space formed between the two members including the inner member and the outer member is accurately sealed.

本発明の密封装置において、前記芯金に固着された弾性体製の環状のシールリップを備え、前記円筒部を前記外側部材に嵌合することによって、前記シールリップが前記内側部材に弾接し、前記芯金とともに前記内側部材及び外側部材間の環状空間を封止する環状シールを構成するものとしても良い。
これによれば、シールリップによって内側部材及び外側部材間の環状空間が封止されるから、内側部材及び外側部材からなる２部材間に形成される被密封空間が的確に密封される。 In the sealing device of the present invention, the sealing device includes an annular seal lip made of an elastic body fixed to the core metal, and the cylindrical portion is fitted to the outer member, whereby the seal lip elastically contacts the inner member, An annular seal for sealing an annular space between the inner member and the outer member together with the cored bar may be formed.
According to this, since the annular space between the inner member and the outer member is sealed by the seal lip, the sealed space formed between the two members including the inner member and the outer member is accurately sealed.

本発明の密封装置によれば、外側部材の外径面に芯金の円筒部を嵌合させるようにした密封装置において、外側部材に対する嵌合の際の円筒部の拡開を抑制し、且つ、外側部材と円筒部との嵌合部分の密封性を向上させることができる。 According to the sealing device of the present invention, in the sealing device in which the cylindrical portion of the core metal is fitted to the outer diameter surface of the outer member, the expansion of the cylindrical portion at the time of fitting to the outer member is suppressed, and In addition, the sealing performance of the fitting portion between the outer member and the cylindrical portion can be improved.

本発明に係る密封装置が装着された軸受装置の一例を示す概略的断面図である。It is a schematic sectional view showing an example of the bearing device in which the sealing device concerning the present invention was installed. 本発明に係る密封装置の第一の実施形態であって、図１のＸ部の拡大図である。FIG. 2 is an enlarged view of a portion X in FIG. 1, which is the first embodiment of the sealing device according to the present invention. 同実施形態の変形例を示す図２と同様図である。It is a figure like FIG. 2 which shows the modification of the same embodiment. 本発明に係る第二の実施形態の密封装置を示す図２と同様図である。It is a figure like FIG. 2 which shows the sealing device of 2nd embodiment concerning this invention. 本発明に係る第三の実施形態の密封装置を示す図２と同様図である。It is a figure like FIG. 2 which shows the sealing device of 3rd embodiment concerning this invention. 本発明に係る密封装置の第四の実施形態であって、図１のＹ部の拡大図である。It is a 4th embodiment of the sealing device concerning the present invention, and is an enlarged drawing of the Y section of Drawing 1. 芯金の円筒部の外側部材に対する嵌合時における外向鍔状部の径方向長さと円筒部の軸方向長さとの比率と円筒部の拡開による変形量との関係を検証した結果を示すグラフである。A graph showing the results of verifying the relationship between the ratio of the radial length of the outward flange-shaped portion to the axial length of the cylindrical portion and the amount of deformation due to the expansion of the cylindrical portion when the cored bar is fitted to the outer member. It is.

以下に本発明の実施の形態について、図面を参照して説明する。先ず、図１を参照して、本発明に係る密封装置が装着された軸受装置について説明する。図１に示す軸受装置１は、自動車の従動輪を回転自在に支持する軸受装置の一例としてのハブベアリングを示している。図例のハブベアリング（軸受装置）１は、車体（不図示）に固定される外輪（外側部材）２の内径部に２列の転動体（玉）３…を介して、ハブ輪４及び内輪部材（単に環状部材ということもある）５が軸Ｌの回りに回転自在に支持されている。ハブ輪４は、ハブフランジ４１を有し、該ハブフランジ４１に、不図示の従動輪（タイヤホイール）がボルト４１ａによって取付けられる。ハブ輪４と内輪部材５とにより内側部材としての内輪６が構成され、前記外輪２とこの内輪６との間に、前記転動体３…がリテーナ３ａに保持された状態で介装されている。ハブ輪４と内輪部材５とは、ハブ輪４の一端部４０を内輪部材５にかしめることにより一体とされている。転動体３…の介装部分を含む外輪２と内輪６との間が環状の軸受空間（被密封空間）Ｓとされ、この軸受空間Ｓには、転動体３…の転動を円滑にするための潤滑剤（例えば、グリース）が充填される。
以下において、図１の紙面左側を車輪側、右側を車体側と言う。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a bearing device equipped with a sealing device according to the present invention will be described with reference to FIG. A bearing device 1 shown in FIG. 1 shows a hub bearing as an example of a bearing device that rotatably supports a driven wheel of an automobile. The illustrated hub bearing (bearing device) 1 includes a hub wheel 4 and an inner ring via two rows of rolling elements (balls) 3 on the inner diameter of an outer ring (outer member) 2 fixed to a vehicle body (not shown). A member (which may be simply an annular member) 5 is rotatably supported around the axis L. The hub wheel 4 has a hub flange 41, and a not-shown driven wheel (tire wheel) is attached to the hub flange 41 with a bolt 41a. An inner ring 6 as an inner member is constituted by the hub wheel 4 and the inner ring member 5, and the rolling elements 3 are interposed between the outer ring 2 and the inner ring 6 while being held by a retainer 3a. . The hub wheel 4 and the inner ring member 5 are integrated by caulking one end 40 of the hub wheel 4 to the inner ring member 5. An annular bearing space (sealed space) S is formed between the outer race 2 and the inner race 6 including the interposed portion of the rolling elements 3. In this bearing space S, the rolling of the rolling elements 3 is smooth. (For example, grease).
Hereinafter, the left side of FIG. 1 is referred to as a wheel side, and the right side is referred to as a vehicle body side.

前記軸受空間Ｓにおける外輪２の車体側端部には、外輪２の開口部２０を封止するキャップ７が嵌合されている。また、外輪２の車輪側端部と内輪６（ハブ輪４）との間には、軸シールタイプのベアリングシール（環状シール）８が、内輪６（ハブ輪４）に対して摺接可能に装着されている。このキャップ７及び環状シール８が、前記軸受空間Ｓを密封する密封装置を構成する。両密封装置（キャップ７及び環状シール８）によって、軸受空間Ｓ内への泥水等の浸入が防止され、また、軸受空間Ｓ内に充填される潤滑剤（グリース等）の外部漏出が防止される。 A cap 7 that seals the opening 20 of the outer ring 2 is fitted to an end of the outer ring 2 in the bearing space S on the vehicle body side. A shaft seal-type bearing seal (annular seal) 8 is provided between the wheel end of the outer ring 2 and the inner ring 6 (hub wheel 4) so as to be able to slide on the inner ring 6 (hub wheel 4). It is installed. The cap 7 and the annular seal 8 constitute a sealing device for sealing the bearing space S. The two sealing devices (the cap 7 and the annular seal 8) prevent infiltration of muddy water and the like into the bearing space S, and prevent the lubricant (grease and the like) filled in the bearing space S from leaking out. .

図２をも参照して、本発明に係る密封装置の第一の実施形態について詳細に説明する。本実施形態の密封装置としてのキャップ７は、外輪２に嵌合される芯金７０と、該芯金７０と外輪２との間を密封するシール部材７５とを備える。本実施形態のキャップ７において、芯金７０は、外輪２の車体側外径面２ａに嵌合される円筒部７１と、円筒部７１の車体側端部（一端部）７１ａから内径側に延びて外輪２の車体側端面（軸Ｌ方向端面）２ｂを密着するように覆う内向鍔状部７２と、円筒部７１の車輪側端部（他端部）７１ｂから外径側に屈曲する外向鍔状部（屈曲部）７３とを備える。さらに、芯金７０は、内向鍔状部７２を含むキャップ本体部７２０を有し、円筒部７１の外輪に対する嵌合状態では、このキャップ本体部７２０が、外輪２の車体側開口部２０を封止するように構成されている。また、シール部材７５はゴム材からなり、円筒部７１の外径面７１ｃ及び外向鍔状部７３の両面を覆うように芯金７０に固着されている。このシール部材７５の芯金７０に対する固着は、未加硫のゴム材と芯金７０とのインサート加硫成型によってなされる。そして、シール部材７５は、円筒部７１の車輪側端部７１ｂにおける外輪２との嵌合部分において内径側に突出する環状突部７５ａを有し、外輪２と円筒部７１との嵌合状態では、環状突部７５ａは、円筒部７１と外輪２の外径面２ａとの間に弾性圧縮状態で介在する。図１及び図２おいて、２点鎖線で示す環状突部７５ａは、圧縮されない原形状の状態であることを示している。この環状突部７５ａの円筒部７１の内径面７１ｄから内径側への突出量ａは、０．１ｍｍ以下とされる。この突出量ａが０．１ｍｍより大きいと、前記インサート加硫成型後の脱型が円滑になされ難くなり、また、円筒部７１の外輪２に対する嵌合時に、環状突部７５ａが破断する事態が生じる傾向となる。 The first embodiment of the sealing device according to the present invention will be described in detail with reference to FIG. The cap 7 as the sealing device of the present embodiment includes a core 70 fitted to the outer ring 2, and a seal member 75 for sealing between the core 70 and the outer ring 2. In the cap 7 of the present embodiment, the core metal 70 extends from the vehicle body side end portion (one end portion) 71a of the cylindrical portion 71 to the vehicle body side outer diameter surface 2a of the outer race 2 toward the inside diameter side. Flange portion 72 that covers the vehicle body side end surface (the end surface in the axis L direction) 2b of the outer ring 2 so as to be in close contact therewith, and an outward flange that bends from the wheel side end portion (the other end portion) 71b of the cylindrical portion 71 to the outer diameter side. (Bending portion) 73. Further, the core bar 70 has a cap body 720 including an inward flange portion 72, and when the cylindrical portion 71 is fitted to the outer ring, the cap body 720 seals the vehicle body side opening 20 of the outer ring 2. It is configured to stop. The seal member 75 is made of a rubber material, and is fixed to the metal core 70 so as to cover both surfaces of the outer diameter surface 71c of the cylindrical portion 71 and the outward flange portion 73. The fixing of the sealing member 75 to the core 70 is performed by insert vulcanization molding of the unvulcanized rubber material and the core 70. The seal member 75 has an annular protrusion 75a projecting toward the inner diameter side at a fitting portion of the cylindrical portion 71 at the wheel side end portion 71b with the outer ring 2, and in a fitting state of the outer ring 2 and the cylindrical portion 71. The annular projection 75a is interposed between the cylindrical portion 71 and the outer diameter surface 2a of the outer race 2 in an elastically compressed state. In FIGS. 1 and 2, the annular projection 75a indicated by a two-dot chain line indicates that it is in an original shape that is not compressed. The amount of protrusion a of the annular projection 75a from the inner diameter surface 71d of the cylindrical portion 71 to the inner diameter side is 0.1 mm or less. If the protrusion amount a is larger than 0.1 mm, it is difficult to smoothly remove the mold after the insert vulcanization molding, and when the cylindrical portion 71 is fitted to the outer ring 2, the annular protrusion 75a may break. Tend to occur.

前記のように構成されるキャップ７は、図２の白抜矢印に沿って専用治具（不図示）をキャップ７のキャップ本体部７２０に作用させることによって、外輪２に嵌合される。この場合、芯金７０の円筒部７１と外輪２との締め代は０．１ｍｍ程度に設定され、外輪２が円筒部７１に圧入されるようにして嵌合がなされる。この嵌合は、芯金７０の内向鍔状部７２が、外輪２の車体側端面２ｂに当接するようになされる。これによって、外輪２の車体側端面２ｂが直接泥水等に晒されることがなく、車体側端面２ｂの発錆が抑えられる。そして、締め代の存在により、円筒部７１はその車輪側端部７１ｂ側が押し広げられるように拡開変形する。しかし、円筒部７１の車輪側端部７１ｂから外径方向に延びる外向鍔状部７３が存在するから、この外向鍔状部７３の補強リブ的作用により、前記拡開変形度合が抑制される。図２における２点鎖線で示す円筒部７１及び外向鍔状部７３は、この変形した状態を誇張して示している。ｈ１は、円筒部７１における車輪側端部７１ｂの外輪２の外径面２ａからの拡開による変形量を示している。 The cap 7 configured as described above is fitted to the outer race 2 by applying a dedicated jig (not shown) to the cap body 720 of the cap 7 along the outlined arrow in FIG. In this case, the interference between the cylindrical portion 71 of the metal core 70 and the outer ring 2 is set to about 0.1 mm, and the outer ring 2 is fitted so as to be pressed into the cylindrical portion 71. This fitting is performed so that the inward flange portion 72 of the metal core 70 comes into contact with the vehicle body side end surface 2 b of the outer race 2. Thereby, the vehicle body side end surface 2b of the outer race 2 is not directly exposed to muddy water or the like, and rusting of the vehicle body side end surface 2b is suppressed. Then, due to the existence of the interference, the cylindrical portion 71 is expanded and deformed so that the wheel-side end portion 71b side is expanded. However, since the outward flange portion 73 extending in the outer radial direction from the wheel-side end portion 71b of the cylindrical portion 71 is present, the degree of the expansion deformation is suppressed by the reinforcing rib-like action of the outward flange portion 73. The cylindrical portion 71 and the outward flange 73 shown by the two-dot chain line in FIG. 2 exaggerate this deformed state. h1 indicates the amount of deformation of the wheel-side end portion 71b of the cylindrical portion 71 due to expansion from the outer diameter surface 2a of the outer ring 2.

図７は、本実施形態における芯金７０の円筒部７１の外輪２に対する嵌合時における外向鍔状部７３の径方向長さｈと円筒部７１の軸方向長さｄとの比率（ｈ／ｄ）と円筒部７１の変形量ｈ１との関係を検証した結果をグラフで示している。図７に示すように、ｈ／ｄが大きくなるほど、変形量ｈ１が少なくなることが理解される。そして、ｈ／ｄが０．５以上、即ち、外向鍔状部７３の径方向長さｈが円筒部７１の軸方向長さｄの１／２以上では、変形量ｈ１が確実に０．１ｍｍ以下とされる。したがって、環状突部７５ａの前記突出量ａを０．１ｍｍ程度にしておけば、ｈ／ｄが０．５以上では、円筒部７１が拡開変形しても、環状突部７５ａの外輪２の外径面２ａに対する弾性的圧縮状態が維持される。したがって、円筒部７１と外輪２との嵌合部が密封され、これにより、当該嵌合部への泥水等の浸入が防止され、さらには、軸受空間Ｓ内への泥水等の浸入や、軸受空間Ｓに充填されている潤滑剤の外部漏出が完全に阻止される。特に、円筒部７１と外輪２との嵌合は金属同士の嵌合であるため、この嵌合部に泥水等が浸入し易いが、環状突部７５ａによって泥水等の浸入が阻止され、嵌合部の発錆が抑えられる。ｈ／ｄが０．５より小さいと、変形量ａが０．１ｍｍを超えることもあり、そのため、円筒部７１と外輪２との嵌合部に泥水等が浸入する懸念が生じるようになる。
なお、外向鍔状部７３の径方向長さｈは、スペース的に許容される範囲内で２．０ｍｍ以上に、また、円筒部７１の軸方向長さｄの長さは、スペース的に許容される範囲内で４．０ｍｍ以上に、それぞれ設定される。 FIG. 7 shows the ratio (h / h) of the radial length h of the outward flange 73 to the axial length d of the cylindrical portion 71 when the cylindrical portion 71 of the cored bar 70 is fitted to the outer ring 2 in the present embodiment. The result of verifying the relationship between d) and the deformation amount h1 of the cylindrical portion 71 is shown in a graph. As shown in FIG. 7, it is understood that the deformation amount h1 decreases as h / d increases. And when h / d is 0.5 or more, that is, when the radial length h of the outward flange-shaped portion 73 is １／ or more of the axial length d of the cylindrical portion 71, the deformation amount h1 is surely 0.1 mm. It is as follows. Therefore, if the protrusion amount a of the annular protrusion 75a is set to about 0.1 mm, and the h / d is 0.5 or more, even if the cylindrical portion 71 is expanded and deformed, the outer ring 2 of the annular protrusion 75a is deformed. The elastic compression state with respect to the outer diameter surface 2a is maintained. Therefore, the fitting portion between the cylindrical portion 71 and the outer ring 2 is sealed, thereby preventing intrusion of muddy water or the like into the fitting portion. External leakage of the lubricant filled in the space S is completely prevented. In particular, since the fitting between the cylindrical portion 71 and the outer ring 2 is a fitting between metals, muddy water or the like easily enters the fitting portion. Rust of the part is suppressed. If h / d is smaller than 0.5, the deformation amount a may exceed 0.1 mm, so that there is a concern that muddy water or the like may enter the fitting portion between the cylindrical portion 71 and the outer ring 2.
Note that the radial length h of the outward flange 73 is 2.0 mm or more within a space allowable range, and the axial length d of the cylindrical portion 71 is space allowable. Is set to be 4.0 mm or more within the range defined.

図３は、第一の実施形態の変形例を示している。この例では、芯金７０における外向鍔状部７３の外径側端部７３ａから、円筒部７１の外径側に位置するように延出された円筒状の折返し部７３０をさらに有している。シール部材７５は前記と同様にゴム材からなり、円筒部７１の外径面７１ｃから外向鍔状部７３及び折返し部７３０の両面を覆うように芯金７０に固着されている。そして、この例でも、シール部材７５は、円筒部７１の車輪側端部７１ｂにおける外輪２との嵌合部分において内径側に突出する環状突部７５ａを有している。また、外輪２と円筒部７１との嵌合状態では、環状突部７５ａは、円筒部７１と外輪２の外径面２ａとの間に圧縮状態で介在する。さらに、外向鍔状部７３がさらに折返し部７３０を有しているから、外向鍔状部７３の前記補強リブ的作用がより強化され、前記嵌合時における円筒部７１の拡開変形がより効果的に抑えられる。また、外向鍔状部７３の径方向長さｈと円筒部７１の軸方向長さｄとの比率（ｈ／ｄ）は、０．５以上であることが望ましく、これによって、円筒部７１が拡開変形しても、環状突部７５ａの外輪２の外径面２ａに対する弾性的圧縮状態が維持される。したがって、円筒部７１と外輪２との嵌合部が密封され、これにより、当該嵌合部への泥水等の浸入が防止され、さらには、軸受空間Ｓ内への泥水等の浸入や、軸受空間Ｓに充填されている潤滑剤の外部漏出が完全に阻止される。
その他の構成は、図２に示す例と同様であるので、共通部分に同一の符号を付し、その作用・効果等の説明を割愛する。 FIG. 3 shows a modification of the first embodiment. In this example, the core 70 further includes a cylindrical folded portion 730 extending from the outer diameter end 73 a of the outward flange 73 to the outer diameter side of the cylindrical portion 71. . The seal member 75 is made of a rubber material as described above, and is fixed to the metal core 70 so as to cover both surfaces of the outward flange 71 and the folded portion 730 from the outer diameter surface 71 c of the cylindrical portion 71. Also in this example, the seal member 75 has an annular projection 75a that protrudes toward the inner diameter side at a fitting portion of the cylindrical portion 71 on the wheel side end 71b with the outer ring 2. When the outer ring 2 and the cylindrical portion 71 are fitted to each other, the annular projection 75a is interposed between the cylindrical portion 71 and the outer diameter surface 2a of the outer ring 2 in a compressed state. Further, since the outward flange portion 73 further has the folded portion 730, the reinforcing rib-like action of the outward flange portion 73 is further strengthened, and the expanding deformation of the cylindrical portion 71 during the fitting is more effective. Can be suppressed. The ratio (h / d) of the length h in the radial direction of the outward flange 73 to the length d in the axial direction of the cylindrical portion 71 is preferably 0.5 or more. Even if it expands and deforms, the elastic compression state of the annular projection 75a against the outer diameter surface 2a of the outer ring 2 is maintained. Therefore, the fitting portion between the cylindrical portion 71 and the outer ring 2 is sealed, thereby preventing intrusion of muddy water or the like into the fitting portion. External leakage of the lubricant filled in the space S is completely prevented.
The other configuration is the same as that of the example shown in FIG.

図４は、本発明に係る第二の実施形態の密封装置を示している。本実施形態の密封装置も第一の実施形態と同様にキャップを構成する。本実施形態では、芯金７０における屈曲部が円筒部７１の車輪側端部７１ｂから円筒部７１に重なるように折り返された重合部７４によって構成されている。そして、シール部材７５は前記各例と同様にゴム材からなり、円筒部７１及び重合部７４を覆うように芯金７０に固着されている。この例では、円筒部７１と重合部７４とが径方向に重なった２重円筒部を形成するから、これによって、嵌合時における円筒部７１の拡開変形を抑制する作用が効果的に発揮される。また、シール部材７５の環状突部７５ａは、前記各例と同様に所定の突出量（図２参照）をもって内径側に突出し、嵌合時に円筒部７１が拡開変形しても、環状突部７５ａの外輪２の外径面２ａに対する弾性的圧縮状態が維持される。したがって、円筒部７１と外輪２との嵌合部が密封され、これにより、当該嵌合部への泥水等の浸入が防止され、さらには、軸受空間Ｓ内への泥水等の浸入や、軸受空間Ｓに充填されている潤滑剤の外部漏出が完全に阻止される。
その他の構成は、前記例と同様であるので、共通部分に同一の符号を付し、その作用・効果等の説明を割愛する。 FIG. 4 shows a sealing device according to a second embodiment of the present invention. The sealing device of the present embodiment also forms a cap as in the first embodiment. In the present embodiment, the bent portion of the metal core 70 is constituted by the overlapping portion 74 that is folded back from the wheel-side end 71 b of the cylindrical portion 71 so as to overlap the cylindrical portion 71. The seal member 75 is made of a rubber material as in the above-described embodiments, and is fixed to the core metal 70 so as to cover the cylindrical portion 71 and the overlap portion 74. In this example, since the cylindrical portion 71 and the overlapping portion 74 form a double cylindrical portion that overlaps in the radial direction, an effect of suppressing the expansion deformation of the cylindrical portion 71 at the time of fitting is effectively exhibited. Is done. Further, the annular projection 75a of the seal member 75 projects to the inner diameter side with a predetermined projection amount (see FIG. 2) similarly to the above-described examples. The elastically compressed state of the outer ring 75 at the outer diameter surface 2a of the outer ring 75a is maintained. Therefore, the fitting portion between the cylindrical portion 71 and the outer ring 2 is sealed, thereby preventing intrusion of muddy water or the like into the fitting portion. External leakage of the lubricant filled in the space S is completely prevented.
Other configurations are the same as those of the above-described example, and thus the same reference numerals are given to the common portions, and the description of the operation and effect thereof is omitted.

図５は、本発明に係る密封装置の第三の実施形態を示している。本実施形態は、前記例のようなゴム材からなるシール部材７５に代えて、液状ガスケット或いは接着剤からなるシール部材７６を用いている。芯金７０の構造は図２に示す例と同様であるが、図３及び図４に示す例と同様であっても良い。この例の芯金７０においても、図２及び図３に示す例と同様に、外向鍔状部７３の径方向長さｈと円筒部７１の軸方向長さｄとの比率（ｈ／ｄ）は、０．５以上に設定されている。これによって、円筒部７１の外輪２に対する嵌合時における円筒部７１の拡開変形が抑えられる。しかし、若干の拡開変形が不可避的に生じる。図５において、２点鎖線部は拡径変形前の状態を、実線部は嵌合後の拡開変形した状態の円筒部７１及び外向鍔状部７３をそれぞれ示している。このように、円筒部７１がその車輪側端部７１ｂより拡開変形すると、円筒部７１の内径面７１ｄと外輪２の外径面２ａとの間に隙間ができる。本実施形態では、この隙間を埋めるように液状ガスケット或いは接着剤からなるシール部材７６を円筒部７１と外輪２との間に介在させている。したがって、拡開変形に伴い生じる円筒部７１の内径面７１ｄと外輪２の外径面２ａとの隙間に泥水等が浸入することを防止することができる。シール部材７６は、円筒部７１と外輪２との嵌合前に円筒部７１の内径面７１ｄ又は外輪２の外径面２ａに塗布するか、或いは、嵌合後に拡開変形による前記隙間に注入することによって、円筒部７１と外輪２との間に介在される。
その他の構成は、図２に示す例と同様であるので、共通部分に同一の符号を付し、その作用・効果等の説明を割愛する。 FIG. 5 shows a third embodiment of the sealing device according to the present invention. In this embodiment, a seal member 76 made of a liquid gasket or an adhesive is used instead of the seal member 75 made of a rubber material as in the above-described example. The structure of the cored bar 70 is the same as the example shown in FIG. 2, but may be the same as the examples shown in FIGS. Also in the core metal 70 of this example, as in the examples shown in FIGS. 2 and 3, the ratio (h / d) of the radial length h of the outward flange 73 to the axial length d of the cylindrical portion 71. Is set to 0.5 or more. This suppresses the expansion deformation of the cylindrical portion 71 when the cylindrical portion 71 is fitted to the outer ring 2. However, some expansion deformation is inevitable. In FIG. 5, the two-dot chain line indicates the state before the expansion deformation, and the solid line indicates the cylindrical part 71 and the outward flange 73 in the expanded state after fitting. When the cylindrical portion 71 expands and deforms from its wheel-side end 71b, a gap is formed between the inner diameter surface 71d of the cylindrical portion 71 and the outer diameter surface 2a of the outer ring 2. In the present embodiment, a sealing member 76 made of a liquid gasket or an adhesive is interposed between the cylindrical portion 71 and the outer ring 2 so as to fill the gap. Therefore, it is possible to prevent muddy water or the like from entering the gap between the inner diameter surface 71d of the cylindrical portion 71 and the outer diameter surface 2a of the outer ring 2 caused by the expanding deformation. The seal member 76 is applied to the inner diameter surface 71d of the cylindrical portion 71 or the outer diameter surface 2a of the outer ring 2 before the cylindrical portion 71 and the outer ring 2 are fitted, or injected into the gap due to the expansion deformation after the fitting. By doing so, it is interposed between the cylindrical portion 71 and the outer ring 2.
Other configurations are the same as those in the example shown in FIG. 2, and thus, the same reference numerals are given to the common portions, and the description of the operation and effect thereof is omitted.

図６は、本発明に係る密封装置の第四の実施形態を示している。本実施形態の密封装置は、図１に示す車輪側に設けられる軸シールタイプのベアリングシール（環状シール）８に適用したものである。本実施形態のベアリングシール８は、外輪２に嵌合される芯金８０と、該芯金８０と外輪２との間を密封するシール部材８５と、芯金８０に固着された弾性体製（例えば、ゴム材製）のシールリップ８６とを備える。芯金８０は、外輪２の車輪側外径面２ａに嵌合される円筒部８１と、円筒部８１の車輪側端部（一端部）８１ａから内径側に延びて外輪２の車輪側端面（軸Ｌ方向端面）２ｃを密着するように覆う内向鍔状部８２と、円筒部８１の車体側端部（他端部）８１ｂから外径側に屈曲する外向鍔状部（屈曲部）８３とを備える。 FIG. 6 shows a fourth embodiment of the sealing device according to the present invention. The sealing device of the present embodiment is applied to a shaft seal type bearing seal (annular seal) 8 provided on the wheel side shown in FIG. The bearing seal 8 of the present embodiment is made of an elastic body fixed to the core 80, a core 80 fitted to the outer ring 2, a seal member 85 for sealing between the core 80 and the outer ring 2. For example, a rubber lip). The core bar 80 extends from the wheel-side end portion (one end portion) 81a of the cylindrical portion 81 to the inner diameter side, and extends from the wheel-side end surface (one end portion) 81a of the outer ring 2 to the wheel-side end surface ( An inward flange portion 82 covering the axis L-direction end surface) 2c so as to be in close contact therewith; an outward flange portion (bent portion) 83 which bends from the vehicle body side end (the other end) 81b of the cylindrical portion 81 to the outer diameter side. Is provided.

また、シール部材８５はゴム材からなり、円筒部８１の外径面８１ｃから外向鍔状部８３の両面を覆うように芯金８０に固着されている。このシール部材８５の芯金８０に対する固着は、未加硫のゴム材と芯金８０とのインサート加硫成型によってなされる。そして、シール部材８５は、円筒部８１の車体側端部８１ｂにおける外輪２との嵌合部分において内径側に突出する環状突部８５ａを有し、外輪２と円筒部８１との嵌合状態では、環状突部８５ａは、円筒部８１と外輪２の外径面２ａとの間に弾性圧縮状態で介在する。図６おいて、２点鎖線で示す環状突部８５ａは、圧縮されない原形状の状態であることを示している。この環状突部８５ａの円筒部８１の内径面８１ｄから内径側への突出量（図２参照）は、０．１ｍｍ以下とされる。この突出量が０．１ｍｍより大きいと、前記インサート加硫成型後の脱型が円滑になされなくなり、また、円筒部８１の外輪２に対する嵌合時に、環状突部８５ａが破断する事態が生じる傾向となる。さらに、本実施形態では、円筒部８１の車輪側端部８１ａから内向鍔状部８２の車輪側面８２ａを覆って内向鍔状部８２の内径側縁部８２ｂを回り込むゴム材製のシールリップ基部８６０を有している。このシールリップ基部８６０は、ハブフランジ（内側部材）４１の車体側面４１ｂ及びハブ輪４の外径面４ａに弾接するよう延びる３個の環状シールリップ（２個のアキシャルリップと１個のラジアルリップ）８６…を備えている。この３個のシールリップ８６…を含むシールリップ基部８６０と、前記シール部材８５とは、連続する同じゴム材からなり、未加硫のゴム材と芯金８０とのインサート加硫成型によって芯金８０に一体的に固着される。 The seal member 85 is made of a rubber material, and is fixed to the metal core 80 so as to cover both surfaces of the outward flange portion 83 from the outer diameter surface 81c of the cylindrical portion 81. The fixing of the seal member 85 to the core 80 is performed by insert vulcanization molding of the unvulcanized rubber material and the core 80. The seal member 85 has an annular protrusion 85a projecting toward the inner diameter side at a fitting portion of the cylindrical portion 81 at the vehicle body side end portion 81b with the outer ring 2, and when the outer ring 2 and the cylindrical portion 81 are fitted to each other. The annular projection 85a is interposed between the cylindrical portion 81 and the outer diameter surface 2a of the outer race 2 in an elastically compressed state. In FIG. 6, an annular projection 85a indicated by a two-dot chain line indicates that it is in an original shape that is not compressed. The amount of protrusion of the annular protrusion 85a from the inner diameter surface 81d of the cylindrical portion 81 to the inner diameter side (see FIG. 2) is set to 0.1 mm or less. If the protrusion amount is larger than 0.1 mm, the mold release after the insert vulcanization molding cannot be performed smoothly, and the annular protrusion 85a tends to break when the cylindrical portion 81 is fitted to the outer ring 2. Becomes Further, in the present embodiment, a rubber-made seal lip base 860 that covers the wheel side surface 82a of the inward flange portion 82 from the wheel side end portion 81a of the cylindrical portion 81 and wraps around the inner diameter side edge portion 82b of the inward flange portion 82. have. The seal lip base 860 includes three annular seal lips (two axial lips and one radial lip) extending so as to elastically contact the vehicle body side surface 41 b of the hub flange (inner member) 41 and the outer diameter surface 4 a of the hub wheel 4. ) 86. The seal lip base 860 including the three seal lips 86 and the seal member 85 are made of the same continuous rubber material, and the core metal is formed by insert vulcanization molding of the unvulcanized rubber material and the core metal 80. 80 and are integrally fixed.

このように構成されるベアリングシール８は、専用治具（不図示）によって外輪２に対して車輪側から嵌合される。この場合、芯金８０の円筒部８１と外輪２との締め代は０．１ｍｍ程度に設定され、外輪２が円筒部８１に圧入されるようにして嵌合がなされる。この嵌合は、芯金８０の内向鍔状部８２が、外輪２の車輪側端面２ｃに当接するようになされる。したがって、外輪２の車輪側端面２ｃが直接泥水等に晒されず、これによって、車輪側端面２ｃの発錆が抑えられる。そして、締め代の存在により、円筒部８１はその車体側端部８１ｂ側が押し広げられるように拡開変形する。しかし、円筒部８１の車体側端部８１ｂから外径方向に延びる外向鍔状部８３が存在するから、この外向鍔状部８３の補強リブ的作用により、前記拡開変形が抑えられる。本実施形態でも、図７に示す検証結果に基づき、外向鍔状部８３の径方向長さｈと円筒部８１の軸方向長さｄとの比率（ｈ／ｄ）は０．５以上であることが望ましく、これによって、拡開による変形量（図２の変形量ｈ１参照）は、０．１ｍｍ以下に抑えられる。したがって、環状突部８５ａの内径側への突出量を０．１ｍｍ程度にしておけば、環状突部８５ａの外輪２の外径面２ａに対する弾性的圧縮状態が維持され、円筒部８１と外輪２との嵌合部が密封され、当該嵌合部への泥水等の浸入が防止される。また、本実施形態では、シールリップ８６…がハブフランジ４１の車体側面４１ｂ及びハブ輪４の外径面４ａに弾接するから、ハブ輪４の軸Ｌ回りの回転時には、これらシールリップ８６…が車体側面４１ｂ及び外径面４ａに弾性的に相対摺接する。これによって、ハブ輪４の回転時にも軸受空間（環状空間）Ｓの車輪側部分が密封され、軸受空間Ｓ内への泥水等の浸入が防止され、また、軸受空間Ｓ内に充填される潤滑剤の外部漏出が防止される。 The bearing seal 8 thus configured is fitted to the outer ring 2 from the wheel side by a dedicated jig (not shown). In this case, the interference between the cylindrical portion 81 of the metal core 80 and the outer ring 2 is set to about 0.1 mm, and the outer ring 2 is fitted so as to be pressed into the cylindrical portion 81. This fitting is performed such that the inward flange portion 82 of the cored bar 80 comes into contact with the wheel-side end surface 2 c of the outer race 2. Therefore, the wheel-side end surface 2c of the outer ring 2 is not directly exposed to muddy water or the like, thereby suppressing rust on the wheel-side end surface 2c. Then, due to the existence of the interference, the cylindrical portion 81 is expanded and deformed so that the vehicle body side end portion 81b side is expanded. However, since the outward flange portion 83 extending in the outer radial direction from the vehicle body side end portion 81b of the cylindrical portion 81 exists, the expansion deformation is suppressed by the reinforcing rib function of the outward flange portion 83. Also in the present embodiment, the ratio (h / d) between the radial length h of the outward flange 83 and the axial length d of the cylindrical portion 81 is 0.5 or more based on the verification results shown in FIG. It is desirable that the deformation amount due to the expansion (see the deformation amount h1 in FIG. 2) is suppressed to 0.1 mm or less. Therefore, if the projecting amount of the annular projection 85a to the inner diameter side is set to about 0.1 mm, the elastic compression state of the annular projection 85a against the outer diameter surface 2a of the outer ring 2 is maintained, and the cylindrical portion 81 and the outer ring 2 Is sealed, and intrusion of muddy water or the like into the fitting portion is prevented. Also, in the present embodiment, the seal lips 86 are in elastic contact with the vehicle body side surface 41b of the hub flange 41 and the outer diameter surface 4a of the hub wheel 4, so that when the hub wheel 4 rotates around the axis L, the seal lips 86 are formed. It is in relative sliding contact with the vehicle body side surface 41b and the outer diameter surface 4a. As a result, even when the hub wheel 4 rotates, the wheel side portion of the bearing space (annular space) S is sealed, preventing intrusion of muddy water or the like into the bearing space S, and lubrication filled in the bearing space S. External leakage of the agent is prevented.

なお、第四の実施形態で示した芯金８０の屈曲部の形状は、これに限定されず、図３、図４に示す芯金７０の屈曲部と同様の形状であっても良い。また、第四の実施形態における芯金８０の内向鍔状部８２の形状や、シールリップ８６の形状及び個数も、図例に限定されるものではない。さらに、第四の実施形態のベアリングシール８は、図１のような従動輪用のハブベアリングに限らず、駆動輪用のハブベアリングにも適用可能である。また、第一乃至第三の実施形態におけるキャップ本体部７２０の形状も、図例に限定されず他の形状も採用可能である。加えて、図１に示すハブベアリングにおいて、内輪部材５に磁気エンコーダ（不図示）を取付け、車体側に磁気センサ（不図示）を設置し、回転に伴う磁気エンコーダの磁気変化をキャップ本体部７２０を介して磁気センサによって検出する回転検出機構を構成するようにしても良い。この場合、芯金７０は非磁性材料で構成されることが望ましい。また、本発明の密封装置を自動車用のハブベアリングに適用した例について述べたが、相対的に同軸回転する内側部材及び外側部材からなる２部材間に被密封空間が形成されるものであれば、他の機械部品にも適用可能である。 Note that the shape of the bent portion of the core bar 80 shown in the fourth embodiment is not limited to this, and may be the same shape as the bent portion of the core bar 70 shown in FIGS. In addition, the shape of the inward flange portion 82 of the core bar 80 and the shape and number of the seal lips 86 in the fourth embodiment are not limited to the illustrated example. Further, the bearing seal 8 of the fourth embodiment is applicable not only to the hub bearing for the driven wheel as shown in FIG. 1, but also to the hub bearing for the driving wheel. Further, the shape of the cap body 720 in the first to third embodiments is not limited to the illustrated example, and other shapes can be adopted. In addition, in the hub bearing shown in FIG. 1, a magnetic encoder (not shown) is attached to the inner ring member 5, a magnetic sensor (not shown) is installed on the vehicle body side, and the magnetic change of the magnetic encoder accompanying rotation is detected by the cap body 720. A rotation detection mechanism that detects a magnetic sensor via the sensor may be configured. In this case, the core 70 is desirably made of a non-magnetic material. Also, an example in which the sealing device of the present invention is applied to a hub bearing for an automobile has been described. However, if a sealed space is formed between two members including an inner member and an outer member that rotate relatively coaxially. It is applicable to other mechanical parts.

２外輪（外側部材）
２ａ外径面
２ｂ車体側端面（軸方向端面）
２ｃ車輪側端面（軸方向端面）
２０車体側開口部
６内輪（内側部材）
７キャップ（密封装置）
７０芯金
７１円筒部
７１ａ車体側端部（一端部）
７１ｂ車輪側端部（他端部）
７２内向鍔状部
７２０キャップ本体部
７３外向鍔状部（屈曲部）
７３ａ外径側端部
７３０折返し部
７４重合部
７５シール部材
７５ａ環状突部
７６液状ガスケット又は接着剤
８ベアリングシール（密封装置）
８０芯金
８１円筒部
８１ａ車輪側端部（一端部）
８１ｂ車体側端部（他端部）
８２内向鍔状部
８３外向鍔状部（屈曲部）
８５シール部材
８５ａ環状突部
８６シールリップ
ｄ円筒部の軸方向長さ
ｈ外向鍔状部の径方向長さ
ｈ１変形量
Ｓ軸受空間（環状空間、被密封空間）
Ｌ軸 2 Outer ring (outer member)
2a Outer diameter surface 2b Car body side end surface (axial end surface)
2c Wheel side end surface (axial end surface)
20 Body side opening 6 Inner ring (inner member)
7 Cap (sealing device)
70 Metal core 71 Cylindrical part 71a Body end (one end)
71b Wheel end (other end)
72 Inward flange-shaped part 720 Cap body part 73 Outward flange-shaped part (bent part)
73a Outer diameter side end portion 730 Folding portion 74 Overlapping portion 75 Sealing member 75a Annular protrusion 76 Liquid gasket or adhesive 8 Bearing seal (sealing device)
80 core metal 81 cylindrical part 81a wheel side end (one end)
81b Car body side end (other end)
82 Inward flange 83 Outward flange (bent)
85 Sealing member 85a Annular protrusion 86 Seal lip d Axial length of cylindrical portion h Radial length of outward flange h1 Deformation amount S Bearing space (annular space, sealed space)
L axis

Claims

A sealing device for sealing a sealed space formed between two members including an inner member and an outer member that rotate relatively coaxially,
A core member fitted to the outer member and a sealing member for sealing between the core member and the outer member,
The core metal has a cylindrical portion fitted to an outer diameter surface of the outer member, an inward flange portion extending from one end of the cylindrical portion to the inner diameter side to cover an axial end surface of the outer member, and the cylindrical member. With a bent portion bent from the other end of the portion to the outer diameter side,
The seal member is configured to be interposed between the cylindrical portion and the outer diameter surface of the outer member at a fitting portion between the cylindrical portion and the outer member,
The bent portion is configured by an outward flange-shaped portion extending in the outer radial direction from the other end of the cylindrical portion, and a radial length of the outward flange is a half of an axial length of the cylindrical portion. 1 or more ,
The seal member is made of a rubber material, and has an annular protrusion protruding toward the inner diameter side at a fitting portion of the other end portion of the cylindrical portion with the outer member, and the annular protrusion is formed of the cylindrical portion and the outer member. Interposed in a compressed state with the outer diameter surface of
The sealing device according to claim 1, wherein an amount of protrusion of the annular protrusion is equal to or more than a deformation amount due to expansion of the cylindrical portion and equal to or less than 0.1 mm .

The sealing device according to claim 1,
The core bar further includes a cylindrical folded portion extending from an outer diameter side end of the outward flange-shaped portion to be located on an outer diameter side of the cylindrical portion. Sealing device.

In the sealing device according to claim 1 or claim 2,
The sealing device, wherein the sealing member is provided so as to cover the cylindrical portion and the bent portion .

A sealing device for sealing a sealed space formed between two members including an inner member and an outer member that rotate relatively coaxially,
A core member fitted to the outer member and a sealing member for sealing between the core member and the outer member,
The core metal has a cylindrical portion fitted to an outer diameter surface of the outer member, an inward flange portion extending from one end of the cylindrical portion to the inner diameter side to cover an axial end surface of the outer member, and the cylindrical member. With a bent portion bent from the other end of the portion to the outer diameter side,
The seal member is configured to be interposed between the cylindrical portion and the outer diameter surface of the outer member at a fitting portion between the cylindrical portion and the outer member,
The sealing device according to claim 1, wherein the bent portion is formed of a superimposed portion that is folded back from the other end of the cylindrical portion so as to overlap the cylindrical portion .

The sealing device according to claim 4,
The sealing member, the sealing device according to claim Rukoto such a liquid gasket.

The sealing device according to claim 4,
The sealing device, wherein the sealing member is made of an adhesive .

The sealing device according to any one of claims 1 to 6 ,
The metal core includes a cap body including the inward flange portion, by fitting the cylindrical portion to the outer member, that make up the cap for sealing the end surface side opening of the outer member A sealing device characterized by the above-mentioned.

The sealing device according to any one of claims 1 to 6 ,
An annular seal lip made of an elastic body fixed to the core bar, and the cylindrical portion is fitted to the outer member, whereby the seal lip elastically contacts the inner member, and the inner member together with the core bar. and a sealing device which is characterized that you configure an annular seal for sealing the annular space between the outer member.