JP2006097703A - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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JP2006097703A
JP2006097703A JP2004280902A JP2004280902A JP2006097703A JP 2006097703 A JP2006097703 A JP 2006097703A JP 2004280902 A JP2004280902 A JP 2004280902A JP 2004280902 A JP2004280902 A JP 2004280902A JP 2006097703 A JP2006097703 A JP 2006097703A
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elastic seal
bearing device
ring
rolling bearing
raceway
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Yoichi Tsuzaki
洋一 津崎
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JTEKT Corp
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JTEKT 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
    • 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
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • 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
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F16C2202/32—Conductivity
    • 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 provide a rolling bearing device capable of preventing occurrence of abnormal sound by low rotation torque and realizing stable current conductivity between raceway track members at low cost. <P>SOLUTION: A ringlike elastic seal 7 fixed to the raceway track member (an outer ring 1) on one side and coming into slide-contact with the raceway track member (an inner ring 2) on the other side to seal an annular space formed between these raceway track members is formed by resin containing carbon nanotube CNT. By this configuration, current conductivity between the raceway track members can be ensured at low cost without complicating a bearing structure. Since a surface of the elastic seal 7 has low friction by adding CNT, rotation torque of the bearing device can be reuced, and abnormal sound does not occur even by slide with the raceway track members. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、２つの軌道部材間に通電性を備えた転がり軸受装置に関する。   The present invention relates to a rolling bearing device having electrical conductivity between two raceway members.

例えば、自動車のステアリングコラム等、軸受回転側と軸受固定側との間に電流を流す（アースする）必要のある部位や、回転中に生じる軌道部材間の電位差によって発生する電食（電触）現象が懸念される部位には、いわゆる通電軸受が使用されている。   For example, parts that require a current to flow (ground) between the bearing rotation side and the bearing fixing side, such as a steering column of an automobile, and electric corrosion generated by a potential difference between raceway members that occurs during rotation (electric contact) So-called current-carrying bearings are used in areas where the phenomenon is a concern.

この通電軸受は、２つの軌道部材の間に、一方の軌道部材（固定側）に固定されて他方の軌道部材（回転側）に滑り接触する通電部材を介在配置したものであり、用いられる通電部材（導電部材）としては、通電ワイヤや金属製のシールド環、あるいは止め輪型の通電部材等が知られている（例えば、特許文献１〜４等を参照。）。   This energizing bearing has an energizing member interposed between two race members, which is fixed to one race member (fixed side) and in sliding contact with the other race member (rotation side). As a member (conductive member), a current-carrying wire, a metal shield ring, a retaining ring-type current-carrying member, or the like is known (see, for example, Patent Documents 1 to 4).

また、自動車等において車輪を支持する転がり軸受装置においても、ハブホイールに取り付けられるタイヤホイールやブレーキの構成（種類）等により、走行中に外輪側軌道部材と内輪側軌道部材との間に電位差が発生して帯電し、断続的にスパークを繰り返す場合があることが知られている。このスパークは、ラジオあるいは電子機器に対する電気的ノイズとして悪影響を及ぼすことがあるため、ハブホイールと車軸の間に、導電材料からなるグリースキャップを介して鋼球を配設し、これらの間をアースする方法が提案されている（特許文献５を参照）。   Also, in a rolling bearing device that supports a wheel in an automobile or the like, there is a potential difference between the outer ring side raceway member and the inner ring side raceway member during traveling due to the configuration (type) of the tire wheel or brake attached to the hub wheel. It is known that it may be generated and charged, and the spark may be repeated intermittently. Since this spark may have an adverse effect as electrical noise to radio or electronic equipment, a steel ball is placed between the hub wheel and the axle via a grease cap made of a conductive material, and the ground is grounded between them. Has been proposed (see Patent Document 5).

特開平７−７１４５１号公報Japanese Patent Laid-Open No. 7-71451 特開２０００−２３０５６５号公報JP 2000-230565 A 特開２０００−２６６０６７号公報JP 2000-266067 A 特開２００１−２０８０７８号公報Japanese Patent Laid-Open No. 2001-208078 特開２００３−１４８６２６号公報JP 2003-148626 A

ところで、前述のような通電部材を用いた転がり軸受装置は、これら通電部材が金属製であることから、回転時に異音（キー音）が発生してしまう場合や、通電部材が摺動する相手部材の摩耗あるいは振動による通電軸受の脱落等によって、安定した通電性を維持できない場合があった。   By the way, in the rolling bearing device using the current-carrying member as described above, since these current-carrying members are made of metal, abnormal noise (key sound) is generated during rotation, or the other side where the current-carrying member slides. In some cases, stable energization could not be maintained due to wear of the member or dropping of the energizing bearing due to vibration.

また、これらの通電方法は、通電部材の摩擦が加わることによる軸受回転トルクの上昇を招くばかりでなく、軸受構造の複雑化による部品点数や組立にかかる作業工数の増加によって、装置全体の製造コストが上昇してしまうという問題がある。   These energization methods not only cause an increase in bearing rotation torque due to the friction of the energizing members, but also increase the number of parts and the number of man-hours required for assembly due to the complexity of the bearing structure. There is a problem that will rise.

本発明は、上記する課題に対処するためになされたものであり、低回転トルクで異音の発生がなく、軌道部材間の安定した通電を低コストで実現できる転がり軸受装置を提供することを目的としている。   The present invention has been made in order to address the above-described problems, and provides a rolling bearing device capable of realizing stable power supply between track members at low cost without generating abnormal noise with low rotational torque. It is aimed.

前記の目的を達成するために、請求項１に記載の発明は、同心状に配置された２つの軌道部材と複数の転動体を備え、前記軌道部材の一方に固定されて、他方の軌道部材または他方の軌道部材に嵌合された金属製環状部材に摺接するリング状弾性シールにより、これら軌道部材の間に形成される環状空間を密封してなる転がり軸受装置において、前記弾性シールが、カーボンナノチューブを含有する樹脂を用いて形成されていることを特徴とする。   In order to achieve the above object, the invention according to claim 1 is provided with two raceway members and a plurality of rolling elements arranged concentrically, fixed to one of the raceway members, and the other raceway member. Alternatively, in a rolling bearing device in which an annular space formed between the race members is sealed by a ring-like elastic seal that is in sliding contact with a metal annular member fitted to the other race member, the elastic seal includes carbon It is formed using a resin containing a nanotube.

カーボンナノチューブ（以下ＣＮＴと略称する）は、グラファイトのシート（グラフェンシート：蜂の巣状の平面的なシート）が筒状に丸まった形状であり、極めて曲げや引っぱりに強く、かつ、多くの薬品とも反応せず非常に安定な物質である。また、ＣＮＴは電子材料としても非常に優れた特性を持っており、前記グラフェンシートを筒状に巻いたときの直径と螺旋度（カイラリティ）によって、電気をよく通す良導体にも半導体にもなりうることが知られている。   Carbon nanotubes (hereinafter abbreviated as CNT) are graphite sheets (graphene sheets: honeycomb-like planar sheets) that are rounded into a cylindrical shape, extremely resistant to bending and pulling, and react with many chemicals. It is a very stable substance. In addition, CNT has very excellent characteristics as an electronic material, and can be a good conductor or semiconductor that conducts electricity well, depending on the diameter and spiralness (chirality) when the graphene sheet is wound into a cylindrical shape. It is known.

本発明は、このＣＮＴが、添加した樹脂に導電性を付与するとともに、その樹脂の表面摩擦係数を改善する点に着目してなされたものであり、通電性が求められる転がり軸受装置の密封に、このＣＮＴを配合した弾性シールを用いることによって、所期の目的を達成しようとするものである。   The present invention was made by paying attention to the point that this CNT imparts conductivity to the added resin and also improves the surface friction coefficient of the resin, and is used for sealing a rolling bearing device that requires electrical conductivity. The intended purpose is to be achieved by using an elastic seal containing this CNT.

すなわち、請求項１に記載の発明によれば、このＣＮＴを含有する樹脂を用いてリング状弾性シールを形成することにより、このシールを導電体とすることができる。従って、このＣＮＴを含有するリング状弾性シールを用いて転がり軸受装置を密封することにより、軸受構造の複雑化を招くことなく、低コストで軌道部材間の通電性を確保することが可能になる。   That is, according to the invention described in claim 1, by forming a ring-shaped elastic seal using a resin containing the CNT, the seal can be used as a conductor. Accordingly, by sealing the rolling bearing device using the ring-shaped elastic seal containing this CNT, it becomes possible to ensure the electrical conductivity between the race members at low cost without incurring the complexity of the bearing structure. .

また、この弾性シールは、ＣＮＴの添加によって表面が低摩擦となることから、軸受装置の回転トルクを低減することができるとともに、軌道部材との摺動によっても異音を発生することがない。更にまた、弾性シール自身の耐久性（耐摩耗性）が向上するとともに、摺動相手部材の摩耗量も低減することができる。従って、本発明の転がり軸受装置は、従来の通電部材を用いた転がり軸受装置に比べ、その通電効果を長期に渡り安定して維持することが可能になる。   Further, since the surface of the elastic seal has low friction due to the addition of CNTs, the rotational torque of the bearing device can be reduced, and no abnormal noise is generated by sliding with the raceway member. Furthermore, the durability (wear resistance) of the elastic seal itself can be improved, and the amount of wear of the sliding mating member can be reduced. Therefore, the rolling bearing device of the present invention can stably maintain the energization effect for a long period of time as compared with the rolling bearing device using the conventional energizing member.

なお、このＣＮＴ含有弾性シールは、軌道部材の間の電位差を解消することから、この電位差によって発生する電食現象が懸念される部位に使用される転がり軸受装置にも好適である。   In addition, since this CNT-containing elastic seal eliminates the potential difference between the race members, the CNT-containing elastic seal is also suitable for a rolling bearing device used in a portion where there is a concern about the electrolytic corrosion phenomenon caused by this potential difference.

また、リング状弾性シールと軌道部材との間に金属材料からなる環状部材が配設された軸受の場合は、この金属製環状部材に前記ＣＮＴ含有弾性シールを接触させれば良い。この構成によって、弾性シールが軌道部材に直接摺接せずとも、同様の作用効果を得られることは勿論、軌道部材表面の摩耗が全くないことから、弾性シールを含む密封装置のみの交換により、転がり軸受全体の寿命を更に延ばすことも可能になる。   In the case of a bearing in which an annular member made of a metal material is disposed between the ring-shaped elastic seal and the raceway member, the CNT-containing elastic seal may be brought into contact with the metallic annular member. With this configuration, the same effect can be obtained even if the elastic seal is not in direct sliding contact with the raceway member, and since there is no wear on the raceway member surface, only by replacing the sealing device including the elastic seal, It is also possible to further extend the life of the entire rolling bearing.

以上のように、本発明の転がり軸受装置によれば、ＣＮＴを含有するリング状弾性シールを用いることにより、軌道部材間の良好な通電性を長期に渡り維持することができるとともに、従来の通電部材を装着した軸受装置に比して、その回転トルクを低減することができる。   As described above, according to the rolling bearing device of the present invention, by using the ring-shaped elastic seal containing CNT, it is possible to maintain a good electrical conductivity between the race members over a long period of time, and the conventional energization The rotational torque can be reduced as compared with a bearing device equipped with a member.

また、このＣＮＴ含有弾性シールを用いた密封方法は、軸受構造の複雑化を招くことなく、装着される転がり軸受全体の製造コストの上昇を最小限に抑えることができる。   In addition, the sealing method using the CNT-containing elastic seal can minimize an increase in the manufacturing cost of the entire mounted rolling bearing without causing a complicated bearing structure.

以下、図面を参照しつつこの発明を実施するための形態について説明する。
図１は、本発明の第１実施形態における転がり軸受装置の構造を示す軸方向断面図である。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is an axial sectional view showing a structure of a rolling bearing device according to a first embodiment of the present invention.

本実施形態における転がり軸受装置は、車両のステアリングコラム用軸受として構成されたものであり、同心状に配置された外輪１と内輪２と、これらの内外輪間に形成される環状空間内に配置されたボール３，３，・・・と、これらボール３をそれぞれ周方向に所定の間隔で保持する保持器４と、を主体として構成されており、その環状空間の両端開口部位には、この環状空間内に充填される潤滑剤（図示省略）を封入するとともに外部からの泥水等の侵入を防ぐための密封装置５Ａ，５Ｂが配置されている。   The rolling bearing device according to this embodiment is configured as a bearing for a steering column of a vehicle, and is arranged in an outer space 1 and an inner ring 2 that are concentrically arranged, and in an annular space formed between these inner and outer rings. .. And the retainer 4 that holds the balls 3 at predetermined intervals in the circumferential direction, respectively. Sealing devices 5A and 5B for sealing a lubricant (not shown) filled in the annular space and preventing intrusion of muddy water from the outside are arranged.

この密封装置５Ａ，５Ｂの構造は、従来のこの種の密封装置と同様であり、芯金６とリング状の弾性シール７とから構成されて、その外輪１側端部を外輪１内周面に形成されたシール溝１ａに嵌め入れて固定されているとともに、その内輪２側端部（シールリップ）が、内輪２外周面に形成されたシール溝２ａの端面に接するように配置されている。   The structure of the sealing devices 5A and 5B is the same as that of this type of conventional sealing device, and is composed of a cored bar 6 and a ring-shaped elastic seal 7, and the outer ring 1 side end portion is the inner peripheral surface of the outer ring 1. The inner ring 2 side end (seal lip) is disposed so as to be in contact with the end surface of the seal groove 2a formed on the outer peripheral surface of the inner ring 2. .

この実施形態における転がり軸受装置の特徴は、環状空間を密封するリング状弾性シール７が、カーボンナノチューブ（ＣＮＴ）を含有するゴムを用いて形成されている点である。また、このＣＮＴの含有により、リング状弾性シール７は導電性を有することとなる。   The feature of the rolling bearing device in this embodiment is that the ring-shaped elastic seal 7 for sealing the annular space is formed using rubber containing carbon nanotubes (CNT). In addition, the ring-shaped elastic seal 7 has conductivity due to the inclusion of the CNTs.

以上の構成により、この転がり軸受装置は、従来の通電軸受ような通電部材を配置することなく、簡易な構造かつ低コストで内外輪間の通電性を確保することができる。従って、本実施形態におけるステアリングコラム用軸受は、軸受回転側と軸受固定側との間に電流を流すことができるとともに、回転中に生じる軌道部材間の電位差によって発生する電食現象を防止することができる。   With the above configuration, this rolling bearing device can ensure the conductivity between the inner and outer rings with a simple structure and at a low cost without arranging a current-carrying member such as a conventional current-carrying bearing. Therefore, the steering column bearing in the present embodiment can flow a current between the bearing rotating side and the bearing fixing side, and can prevent the electrolytic corrosion phenomenon caused by the potential difference between the track members generated during the rotation. Can do.

また、このリング状弾性シール７は、ＣＮＴの添加により表面が低摩擦となることから、回転時における軸受の回転トルクを低減することができる。しかも、このＣＮＴの添加により弾性シール７自身の耐摩耗性が向上するとともに、内輪２側摺動部位の摩耗量も低減される。従って、このステアリングコラム用軸受は、従来の通電軸受に比べ、その通電効果を長期に渡り安定して維持することが可能になる。   In addition, since the surface of the ring-shaped elastic seal 7 has low friction due to the addition of CNTs, the rotational torque of the bearing during rotation can be reduced. In addition, the addition of CNTs improves the wear resistance of the elastic seal 7 itself, and also reduces the amount of wear at the sliding portion on the inner ring 2 side. Therefore, the steering column bearing can stably maintain the energization effect for a long period of time as compared with the conventional energizing bearing.

なお、この実施形態におけるＣＮＴ含有リング状弾性シール７を構成する材料は、特に限定されるものではなく、ニトリルゴム，ＮＢＲ，フッ素ゴム，シリコンゴム等の他、弾性を備える樹脂を用いて形成しても良い。また、リップや芯金を含めた形状も、この例に限定されるものではなく、軸受の形状や設置される環境に応じて適宜変更することができる。   The material constituting the CNT-containing ring-shaped elastic seal 7 in this embodiment is not particularly limited, and is formed using a resin having elasticity in addition to nitrile rubber, NBR, fluorine rubber, silicon rubber, or the like. May be. Further, the shape including the lip and the cored bar is not limited to this example, and can be appropriately changed according to the shape of the bearing and the installation environment.

また、本実施形態においては、軸受環状空間の両端開口部に装着される密封装置５Ａ，５Ｂの両方に、ＣＮＴを含有するリング状弾性シールを用いたが、どちらか一方のみをＣＮＴ含有弾性シールとし、他方を従来公知の弾性シールとしても良い。   In this embodiment, the ring-shaped elastic seal containing CNT is used for both of the sealing devices 5A and 5B attached to the opening portions at both ends of the bearing annular space, but only one of them is a CNT-containing elastic seal. The other may be a conventionally known elastic seal.

次に、本発明の第２実施形態について説明する。
図２は、本発明の第２実施形態における転がり軸受装置の構造を示す軸方向断面図であり、図３は、図２のＰ部拡大図である。 Next, a second embodiment of the present invention will be described.
FIG. 2 is an axial sectional view showing the structure of a rolling bearing device according to the second embodiment of the present invention, and FIG. 3 is an enlarged view of a portion P in FIG.

この実施形態における転がり軸受装置は、車両の車輪を支持する車輪用軸受装置として構成されたものであり、車体側に非回転に固定された外輪側軌道部材（外輪１１）と、この外輪１１と同心状に配置された内輪側軌道部材（ハブホイール１２および環体１３）と、これらの軌道部材の間に形成される環状空間内に配置された複列のボール１４，１４，・・・と、これらボール１４の各列をそれぞれ周方向に所定の間隔で保持する保持器１５，１５と、を主体として構成されている。   The rolling bearing device in this embodiment is configured as a wheel bearing device that supports the wheels of a vehicle, and includes an outer ring side race member (outer ring 11) fixed non-rotatingly on the vehicle body side, Inner ring side race members (hub wheel 12 and ring body 13) arranged concentrically, and double rows of balls 14, 14,... Arranged in an annular space formed between these race members. The cages 15 and 15 for holding the rows of the balls 14 at predetermined intervals in the circumferential direction are mainly configured.

また、外輪１と内輪側軌道部材１２，１３との間に形成される環状空間の両端開口部位には、この環状空間内に充填される潤滑剤（図示省略）を封入するとともに外部からの泥水等の侵入を防ぐための密封装置（アウタ側密封装置１７Ａおよびインナ側密封装置１７Ｂ）が配置されている。   In addition, a lubricant (not shown) filled in the annular space is sealed in both ends of the annular space formed between the outer ring 1 and the inner ring side race members 12 and 13 and muddy water from the outside. Sealing devices (outer side sealing device 17A and inner side sealing device 17B) for preventing intrusion or the like are disposed.

図３に示すように、このインナ側密封装置１７Ｂは、従来のこの種の密封装置と同様の構造であり、外輪１１のインナ側内周面に嵌合された芯金１８と、環体１３の外周面に嵌合された断面Ｌ字形の環状部材（金属環１９）と、前記芯金１８により外輪１１に固定されて金属環１９に摺接するリング状弾性シール２０とから構成されている。   As shown in FIG. 3, the inner side sealing device 17 </ b> B has the same structure as this type of conventional sealing device, and a metal core 18 fitted to the inner side inner peripheral surface of the outer ring 11, and the ring body 13. An annular member (metal ring 19) having an L-shaped cross section fitted to the outer peripheral surface of the ring, and a ring-shaped elastic seal 20 fixed to the outer ring 11 by the metal core 18 and slidably contacting the metal ring 19.

この実施形態における転がり軸受装置の特徴は、環状空間を密封するリング状弾性シール２０が、カーボンナノチューブ（ＣＮＴ）を含有するゴムを用いて形成されている点である。また、第１実施形態と同様、このＣＮＴの含有により、リング状弾性シール２０は導電性を有することとなる。   The feature of the rolling bearing device in this embodiment is that the ring-shaped elastic seal 20 that seals the annular space is formed using rubber containing carbon nanotubes (CNT). In addition, as in the first embodiment, the ring-shaped elastic seal 20 has conductivity due to the inclusion of the CNTs.

以上の構成により、この転がり軸受装置は、従来の車輪用軸受装置ような通電部材を配置することなく、簡易な構造かつ低コストで軌道部材間の通電性を確保することができる。従って、本実施形態における車輪用軸受装置は、走行中に発生する外輪側軌道部材と内輪側軌道部材との間に電位差を解消することが可能で、この電位差に起因して発生するラジオノイズ等を防止することができる。   With the configuration described above, this rolling bearing device can ensure the conductivity between the track members with a simple structure and at a low cost without arranging a current-carrying member like a conventional wheel bearing device. Therefore, the wheel bearing device according to the present embodiment can eliminate the potential difference between the outer ring side raceway member and the inner ring side raceway member that is generated during traveling, and radio noise generated due to this potential difference. Can be prevented.

また、このリング状弾性シール２０は、ＣＮＴの添加により表面が低摩擦であることから、軸受装置の回転トルクを低減することができるとともに、弾性シール２０自身の耐摩耗性が向上する。従って、本実施形態における車輪用軸受装置は、従来の車輪用軸受装置に比べ、その通電効果を長期に渡り安定して維持することが可能になる。   Further, since the surface of the ring-shaped elastic seal 20 has low friction due to the addition of CNTs, the rotational torque of the bearing device can be reduced and the wear resistance of the elastic seal 20 itself is improved. Therefore, the wheel bearing device in the present embodiment can stably maintain the energization effect for a long period of time as compared with the conventional wheel bearing device.

なお、本実施形態における密封装置のリング状弾性シール２０を構成する材料も、第１実施形態と同様、ニトリルゴム，ＮＢＲ，フッ素ゴム，シリコンゴム等の他、弾性を備える樹脂を使用することができる。また、リップや芯金等を含めた形状も、この例に限定されるものではなく、軸受の形状や設置される環境に応じて適宜変更すれば良い。   Note that the material constituting the ring-shaped elastic seal 20 of the sealing device in this embodiment is also made of a resin having elasticity in addition to nitrile rubber, NBR, fluorine rubber, silicon rubber, etc., as in the first embodiment. it can. Further, the shape including the lip and the core metal is not limited to this example, and may be appropriately changed according to the shape of the bearing and the installation environment.

また、本発明のリング状弾性シールに配合されるＣＮＴの種類は特に限定されるものではなく、チューブが何層にも重なった構造の多層カーボンナノチューブ（ｍｕｌｔｉ−ｗａｌｌ ｃａｒｂｏｎ ｎａｎｏｔｕｂｅ）、単層カーボンナノチューブ（ｓｉｎｇｌｅ−ｗａｌｌ ｃａｒｂｏｎ ｎａｎｏｔｕｂｅ）や、非常に細い中心空洞を持ったいわゆるナノグラファイバー等の中から、要求される導電性あるいは耐摩耗性を鑑みて、単独あるいは混合して用いれば良い。   Further, the type of CNT blended in the ring-shaped elastic seal of the present invention is not particularly limited, and a multi-wall carbon nanotube having a structure in which tubes are stacked in multiple layers (single-wall carbon nanotube) (Single-wall carbon nanotube) or so-called nanografiber having a very narrow central cavity may be used alone or in combination in view of required conductivity or wear resistance.

本発明の第１実施形態における転がり軸受装置の構造を示す軸方向断面図である。It is an axial sectional view showing the structure of the rolling bearing device in the first embodiment of the present invention. 本発明の第２実施形態における転がり軸受装置の構造を示す軸方向断面図である。It is an axial sectional view showing the structure of a rolling bearing device in a second embodiment of the present invention. 図２のＰ部拡大図である。It is the P section enlarged view of FIG.

符号の説明Explanation of symbols

１ 外輪
２ 内輪
３ ボール
４ 保持器
５Ａ，５Ｂ 密封装置
６ 芯金
７ リング状弾性シール
１１ 外輪
１２ ハブホイール
１３ 環体
１４ ボール
１５ 保持器
１６ ハブボルト
１７Ａ アウタ側密封装置
１７Ｂ インナ側密封装置
１８ 芯金
１９ 金属環
２０ リング状弾性シール
DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Ball 4 Cage 5A, 5B Sealing device 6 Core metal 7 Ring-shaped elastic seal 11 Outer ring 12 Hub wheel 13 Ring 14 Ball 15 Cage 16 Hub bolt 17A Outer side sealing device 17B Inner side sealing device 18 Core metal 19 Metal ring 20 Ring-shaped elastic seal

Claims (1)

同心状に配置された２つの軌道部材と複数の転動体を備え、前記軌道部材の一方に固定されて、他方の軌道部材または他方の軌道部材に嵌合された金属製環状部材に摺接するリング状弾性シールにより、これら軌道部材の間に形成される環状空間を密封してなる転がり軸受装置において、
前記弾性シールが、カーボンナノチューブを含有する樹脂を用いて形成されていることを特徴とする転がり軸受装置。
A ring having two raceway members arranged concentrically and a plurality of rolling elements, fixed to one of the raceway members, and slidably contacted with the other raceway member or a metal annular member fitted to the other raceway member In the rolling bearing device formed by sealing the annular space formed between these raceway members by a cylindrical elastic seal,
The rolling bearing device, wherein the elastic seal is formed using a resin containing carbon nanotubes.
JP2004280902A 2004-09-28 2004-09-28 Rolling bearing device Pending JP2006097703A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Publication Number Publication Date
JP2006097703A true JP2006097703A (en) 2006-04-13

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Application Number Title Priority Date Filing Date
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Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100932544B1 (en) * 2007-12-19 2009-12-17 주식회사 티엠시 Sintered bearing and its manufacturing method
DE102015224044A1 (en) * 2015-12-02 2016-10-20 Schaeffler Technologies AG & Co. KG Seal element and seal arrangement
JP2019509007A (en) * 2016-03-03 2019-03-28 カコ ゲーエムベーハー ウント コンパニー カーゲー Shaft grounding ring

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004132486A (en) * 2002-10-11 2004-04-30 Nsk Ltd Wheel supporting rolling bearing unit
JP2005201435A (en) * 2003-12-18 2005-07-28 Koyo Seiko Co Ltd Sealing device and energized bearing including it

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004132486A (en) * 2002-10-11 2004-04-30 Nsk Ltd Wheel supporting rolling bearing unit
JP2005201435A (en) * 2003-12-18 2005-07-28 Koyo Seiko Co Ltd Sealing device and energized bearing including it

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100932544B1 (en) * 2007-12-19 2009-12-17 주식회사 티엠시 Sintered bearing and its manufacturing method
DE102015224044A1 (en) * 2015-12-02 2016-10-20 Schaeffler Technologies AG & Co. KG Seal element and seal arrangement
JP2019509007A (en) * 2016-03-03 2019-03-28 カコ ゲーエムベーハー ウント コンパニー カーゲー Shaft grounding ring
JP7033538B2 (en) 2016-03-03 2022-03-10 カコ ゲーエムベーハー ウント コンパニー カーゲー Shaft ground ring

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