JP2007232175A - Bearing unit - Google Patents

Bearing unit Download PDF

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Publication number
JP2007232175A
JP2007232175A JP2006057711A JP2006057711A JP2007232175A JP 2007232175 A JP2007232175 A JP 2007232175A JP 2006057711 A JP2006057711 A JP 2006057711A JP 2006057711 A JP2006057711 A JP 2006057711A JP 2007232175 A JP2007232175 A JP 2007232175A
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Japan
Prior art keywords
wheel
seal
stationary
bearing unit
rotating wheel
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JP2006057711A
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Japanese (ja)
Inventor
Yasushi Tomizuka
靖史 冨塚
Hideshi Shibuya
英志 渋谷
Hirohide Ishida
博英 石田
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NSK Ltd
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NSK Ltd
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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
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7826—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • 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
    • 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)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive bearing unit which efficiently prevents rust by a simple process without increasing the number of part items. <P>SOLUTION: The unit is equipped with seal members 10, 20 provided to a vehicle body side and wheel side so as to seal an annular space between a static wheel 2 fixed to a vehicle body side and a rotating wheel 4 connected to a wheel side. The seal member 10 on the wheel side is positioned with the base end fixed to the static wheel and the tip is normally brought into a slide contact with a seal sliding surface 12m formed on the outer peripheral surface of the rotary wheel. In the rotary wheel, a hub flange 12a to which a wheel side component is fixed is protrusively provided to the wheel side. The seal sliding surface is formed in a portion transferring from an outer peripheral surface of the rotary wheel to the hub flange and constituted by a curved surface opposed to the static wheel. At least the seal sliding surface in the outer peripheral surface (the entire surface 12M) of the rotary wheel is subjected to rustproof treatment by a prescribed rustproof treatment material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、防錆処理が施された軸受ユニットに関する。   The present invention relates to a bearing unit subjected to a rust prevention treatment.

従来から、自動車の車輪(例えば、ディスクホイール)を車体(例えば、懸架装置(サスペンション))に対して回転自在に支持するための各種の軸受ユニットが知られている。例えば図１(ａ)に示された軸受ユニットは、車体側に固定されて常時非回転状態に維持される静止輪(外輪)２と、静止輪２の内側に対向して設けられ且つ車輪側に接続されて車輪と共に回転する回転輪(内輪)４と、静止輪２と回転輪４との間に複列(例えば２列)で回転可能に組み込まれた複数の転動体6,8とを備えている。   2. Description of the Related Art Conventionally, various bearing units for rotatably supporting a vehicle wheel (for example, a disc wheel) with respect to a vehicle body (for example, a suspension device (suspension)) are known. For example, the bearing unit shown in FIG. 1 (a) includes a stationary wheel (outer ring) 2 that is fixed to the vehicle body and is always kept in a non-rotating state, and is provided facing the inner side of the stationary wheel 2 and on the wheel side. A rotating wheel (inner ring) 4 that is connected to the wheel and rotates together with the wheels, and a plurality of rolling elements 6 and 8 that are rotatably mounted in a double row (for example, two rows) between the stationary wheel 2 and the rotating wheel 4. I have.

この場合、静止輪２は中空円筒状を成しており、回転輪４の外周を覆うように配置されており、静止輪２と回転輪４との間には、軸受ユニット内部(静止輪２と回転輪４との間の環状空間)を密封するためのシール部材10,20が設けられている。なお、転動体6,8として図面では、玉を例示しているが、軸受ユニットの構成や種類に応じて、コロが適用される場合もある。   In this case, the stationary wheel 2 has a hollow cylindrical shape and is disposed so as to cover the outer periphery of the rotating wheel 4. Between the stationary wheel 2 and the rotating wheel 4, there is an inside of the bearing unit (the stationary wheel 2. Sealing members 10 and 20 are provided for sealing the annular space between the rotating wheel 4 and the rotating wheel 4. In the drawings, balls are illustrated as the rolling elements 6 and 8, but rollers may be applied depending on the configuration and type of the bearing unit.

静止輪(外輪)２には、その外周面から外方に向って突出した固定フランジ２ａが一体成形されており、固定フランジ２ａの固定孔(図示しない)に固定用ボルト(図示しない)を挿入し、これを車体側に締結することで、静止輪２を図示しない懸架装置(ナックル)に固定することができる。また、回転輪(内輪)４には、車輪側構成品(例えば、自動車のディスクホイールやブレーキロータなど)を支持しつつ共に回転する略円筒形状のハブ１２が設けられており、ハブ１２には、車輪側構成品が固定されるハブフランジ１２ａが突設されている。   The stationary ring (outer ring) 2 is integrally formed with a fixing flange 2a protruding outward from its outer peripheral surface, and a fixing bolt (not shown) is inserted into a fixing hole (not shown) of the fixing flange 2a. Then, by fastening this to the vehicle body side, the stationary wheel 2 can be fixed to a suspension device (knuckle) not shown. Further, the rotating wheel (inner ring) 4 is provided with a substantially cylindrical hub 12 that rotates while supporting a wheel-side component (for example, a disc wheel or a brake rotor of an automobile). The hub flange 12a to which the wheel side component is fixed is provided.

ハブフランジ１２ａは、静止輪(外輪)２を越えて外方(ハブ１２の半径方向外側)に向って延出しており、その延出縁付近には、周方向に沿って所定間隔で配置された複数のハブボルト１４が設けられている。この場合、各ハブボルト１４を車輪側構成品(例えば、自動車のディスクホイールやブレーキロータなど)に形成されたボルト孔(図示しない)に差し込んでハブナット(図示しない)で締付けることにより、当該車輪側構成品をハブフランジ１２ａに対して位置決めして固定することができる。   The hub flange 12a extends outward (outward in the radial direction of the hub 12) beyond the stationary ring (outer ring) 2, and is arranged at predetermined intervals along the circumferential direction in the vicinity of the extended edge. A plurality of hub bolts 14 are provided. In this case, each hub bolt 14 is inserted into a bolt hole (not shown) formed in a wheel side component (for example, an automobile disc wheel, brake rotor, etc.) and tightened with a hub nut (not shown). The product can be positioned and fixed with respect to the hub flange 12a.

また、ハブ１２(回転輪４)には、その車体側に環状の回転輪構成体１６(ハブ１２と共に回転輪４を構成する部材)が嵌合(外嵌)されるようになっている。この場合、例えば静止輪２と回転輪４との間に複数の転動体6,8を介挿した状態(具体的には、各転動体6,8を保持器１８で保持した状態)で、回転輪構成体１６をハブ１２に形成された段部１２ｂまで嵌合(外嵌)した後、ハブ１２の車体側端部の加締め領域１２ｃを塑性変形させて、当該加締め領域１２ｃを回転輪構成体１６の周端部１６ｓに沿って加締める(密着させる)ことで、当該回転輪構成体１６を回転輪４(ハブ１２)に固定することができる。   The hub 12 (rotating wheel 4) is fitted (externally fitted) with an annular rotating wheel component 16 (a member constituting the rotating wheel 4 together with the hub 12) on the vehicle body side. In this case, for example, in a state where a plurality of rolling elements 6 and 8 are interposed between the stationary wheel 2 and the rotating wheel 4 (specifically, each rolling element 6 and 8 is held by the cage 18), After the rotating wheel component 16 is fitted (externally fitted) to the step 12b formed on the hub 12, the caulking region 12c at the vehicle body side end of the hub 12 is plastically deformed to rotate the caulking region 12c. By caulking (adhering) along the circumferential end portion 16s of the ring component 16, the rotating wheel component 16 can be fixed to the rotating wheel 4 (hub 12).

このとき、軸受ユニットには所定の予圧が付与された状態となり、この状態において、各転動体6,8は、互いに所定の接触角を成して静止輪２と回転輪４の軌道面(静止軌道面２ｓ、回転軌道面４ｓ)にそれぞれ接触して回転可能に組み込まれる。この場合、２つの接触点を結んだ作用線(図示しない)は、各軌道面2s,4sに直交し且つ各転動体6,8の中心を通り、軸受ユニットの中心線上の１点(作用点)で交わる。これにより背面組合せ形(ＤＢ)軸受が構成される。   At this time, a predetermined preload is applied to the bearing unit, and in this state, the rolling elements 6 and 8 form a predetermined contact angle with each other so that the raceway surfaces of the stationary wheel 2 and the rotating wheel 4 (stationary). The raceway surface 2s and the rotary raceway surface 4s) are respectively brought into contact with and rotated. In this case, an action line (not shown) connecting the two contact points is perpendicular to the raceway surfaces 2s and 4s and passes through the centers of the rolling elements 6 and 8, so that one point on the center line of the bearing unit (the action point). ) This constitutes a rear combination (DB) bearing.

なお、このような構成において、自動車走行中に車輪に作用した力は、全てディスクホイールから軸受ユニットを通じて懸架装置に伝達されることになり、その際、軸受ユニットには、各種の荷重(ラジアル荷重、アキシアル荷重、モーメント荷重など)が作用する。しかし、軸受ユニットは、上述したような背面組合せ形(ＤＢ)軸受となっているため、各種の荷重に対して高い剛性が維持される。   In such a configuration, all of the force acting on the wheel during traveling of the vehicle is transmitted from the disk wheel to the suspension device through the bearing unit. At that time, various loads (radial loads) are applied to the bearing unit. , Axial load, moment load, etc.). However, since the bearing unit is a back combination (DB) bearing as described above, high rigidity is maintained with respect to various loads.

また、シール部材10,20としては、車輪側にリップシール１０、車体側にパックシール２０がそれぞれ適用されており、軸受外部への潤滑剤(例えば、グリース、油)の漏洩、軸受内部への異物(例えば、泥水、塵埃)の侵入防止が図られている。なお、車体側のパックシール２０は、回転輪構成体１６に外嵌(固定)されたスリンガ２０ａと、静止輪２に内嵌(固定)されたシール本体２０ｂとから構成されており、シール本体２０ｂには、１又は複数のシールリップ(特に参照符号は付さない)が設けられており、各シールリップは、スリンガ２０ａに常時摺接した状態に維持されている。   Further, as the seal members 10 and 20, a lip seal 10 is applied to the wheel side and a pack seal 20 is applied to the vehicle body side, respectively, and leakage of lubricant (for example, grease, oil) to the outside of the bearing, Intrusion prevention of foreign matter (for example, muddy water, dust) is achieved. The pack seal 20 on the vehicle body side includes a slinger 20a that is externally fitted (fixed) to the rotating wheel component 16, and a seal body 20b that is internally fitted (fixed) to the stationary wheel 2. 20b is provided with one or a plurality of seal lips (particularly not denoted by reference numerals), and each seal lip is maintained in a state in which it is always in sliding contact with the slinger 20a.

これに対して、車輪側のリップシール１０は、その基端が静止輪２に内嵌(固定)されており、その先端に１又は複数のシールリップ１０ｔが設けられている。この場合、シールリップ１０ｔは、ハブ１２(回転輪４)の外周に形成されたシール摺動面１２ｍに常時摺接した状態に位置決めされている。なお、シール摺動面１２ｍは、ハブ１２(回転輪４)の外周表面からハブフランジ１２ａに移行する部位に形成され且つ静止輪２に対向した湾曲面として構成されている。   On the other hand, the base end of the lip seal 10 on the wheel side is fitted (fixed) to the stationary wheel 2, and one or a plurality of seal lips 10t are provided at the tip. In this case, the seal lip 10t is positioned so as to be always in sliding contact with the seal sliding surface 12m formed on the outer periphery of the hub 12 (rotating wheel 4). The seal sliding surface 12m is formed as a curved surface that is formed at a portion that transitions from the outer peripheral surface of the hub 12 (the rotating wheel 4) to the hub flange 12a and faces the stationary wheel 2.

ところで、上述したような軸受ユニットにおいて、その構成品(例えば、静止輪２、回転輪４、転動体6,8)は、各種の金属材料(例えば、炭素鋼)で形成されているため、比較的腐食し易いものとなっている。特に車輪側に接近して形成されているシール摺動面１２ｍは、車輪側で跳ね返された例えば泥水がかかり易い位置にある。このため、軸受ユニットの長期使用によりシール摺動面１２ｍが錆び付いて、その結果、シールリップ１０ｔとシール摺動面１２ｍとの間のシール性が低下してしま場合がある。   By the way, in the bearing unit as described above, the components (for example, the stationary wheel 2, the rotating wheel 4, and the rolling elements 6, 8) are formed of various metal materials (for example, carbon steel). It is easy to corrode. In particular, the seal sliding surface 12m formed close to the wheel side is at a position where, for example, muddy water bounced back on the wheel side is easily applied. For this reason, the seal sliding surface 12m is rusted by long-term use of the bearing unit, and as a result, the sealing performance between the seal lip 10t and the seal sliding surface 12m may be deteriorated.

そこで、図１(ｃ)に示すように、例えば特許文献１には、シール摺動面１２ｍに不錆性の金環２２を嵌着し、当該金環２２にシールリップ１０ｔを接触させる防錆処理技術が提案されている。しかしながら、かかる技術では、軸受の構成品に加えて新たに金環２２が別途必要となるため、軸受全体の部品点数が増加すると共に、金環２２をシール摺動面１２ｍに嵌着させるための面倒な処理工程も別途必要になる。この結果、軸受の製造効率が低下するだけで無く、その製造コストが上昇してしまう。かかる問題を解決するために、部品点数を増加させること無く、簡単な処理で効率的に防錆を図ることが可能な低価格な軸受ユニットが望まれているが、現在そのような軸受ユニットは知られていない。
特開２００３−５６５７７号公報 Therefore, as shown in FIG. 1 (c), for example, in Patent Document 1, a rust-proofing technique in which a non-rusting metal ring 22 is fitted to the seal sliding surface 12m and the seal lip 10t is brought into contact with the metal ring 22 is shown. Has been proposed. However, such a technique requires a new metal ring 22 in addition to the bearing components, which increases the number of parts of the entire bearing and is troublesome for fitting the metal ring 22 to the seal sliding surface 12m. A separate processing step is also required. As a result, not only the production efficiency of the bearing is lowered, but also the production cost is increased. In order to solve such a problem, there is a demand for a low-priced bearing unit that can efficiently prevent rust by a simple process without increasing the number of parts. unknown.
JP 2003-56577 A

本発明は、このような問題を解決するためになされており、その目的は、部品点数を増加させること無く、簡単な処理で効率的に防錆を図ることが可能な低価格な軸受ユニットを提供することにある。   The present invention has been made to solve such a problem, and an object of the present invention is to provide a low-cost bearing unit that can efficiently prevent rust by a simple process without increasing the number of parts. It is to provide.

このような目的を達成するために、本発明は、車体側に固定されて常時非回転状態に維持される静止輪と、静止輪の内側に対向して設けられ且つ車輪側に接続されて車輪と共に回転する回転輪と、静止輪と回転輪との間に転動自在に組み込まれた複数の転動体と、静止輪と回転輪との間の環状空間を密封するために車体側及び車輪側にそれぞれ設けられたシール部材とを備えた軸受ユニットであって、車輪側に設けられたシール部材は、その基端が静止輪に固定され、その先端が回転輪の外周表面に形成されたシール摺動面に常時摺接した状態で位置決めされていると共に、回転輪には、その車輪側に、車輪側構成品が固定されるフランジが突設されており、シール摺動面は、回転輪の外周表面からフランジに移行する部位に形成され且つ静止輪に対向した湾曲面として構成されていると共に、回転輪の外周表面のうち、少なくともシール摺動面には、所定の防錆処理材で防錆処理が施されている。この場合、防錆処理材としては、撥水性コーティング材を適用可能であり、防錆処理では、撥水性コーティング材をシール摺動面にコーティングする。   In order to achieve such an object, the present invention provides a stationary wheel that is fixed to the vehicle body side and is maintained in a non-rotating state at all times, a wheel provided opposite to the inside of the stationary wheel and connected to the wheel side. A rotating wheel that rotates together with the rotating wheel, a plurality of rolling elements that are rotatably mounted between the stationary wheel and the rotating wheel, and a vehicle body side and a wheel side to seal an annular space between the stationary wheel and the rotating wheel. Each of which is provided with a seal member provided on the wheel side, the seal member provided on the wheel side having a base end fixed to the stationary wheel and a tip formed on the outer peripheral surface of the rotating wheel. The rotating wheel is positioned while being always in sliding contact with the sliding surface, and a flange on which the wheel side component is fixed projects from the rotating wheel. It is formed at the part that transitions from the outer peripheral surface to the flange and is static Together is configured as a curved surface facing the wheel, of the outer peripheral surface of the rotating wheel, at least seal sliding surface, antirust treatment is performed at a predetermined rustproofing material. In this case, a water-repellent coating material can be applied as the anti-rust treatment material, and the water-repellent coating material is coated on the seal sliding surface in the anti-rust treatment.

また、本発明は、車体側に固定されて常時非回転状態に維持される静止輪と、静止輪の内側に対向して設けられ且つ車輪側に接続されて車輪と共に回転する回転輪と、静止輪と回転輪との間に転動自在に組み込まれた複数の転動体とを備えた軸受ユニットであって、回転輪は、全体が所定の防錆材料で形成されている。この場合、防錆材料としては、ステンレス材を適用可能である。   The present invention also includes a stationary wheel that is fixed to the vehicle body side and is maintained in a non-rotating state at all times, a rotating wheel that is provided facing the inside of the stationary wheel and that is connected to the wheel side and rotates together with the wheel, The bearing unit includes a plurality of rolling elements that are rotatably incorporated between a wheel and a rotating wheel, and the rotating wheel is entirely formed of a predetermined rust-proof material. In this case, a stainless material can be applied as the anticorrosive material.

本発明によれば、回転輪の外周表面のうち、少なくともシール摺動面に所定の防錆処理材で防錆処理を施したことにより、部品点数を増加させること無く、簡単な処理で効率的に防錆を図ることが可能な低価格な軸受ユニットを実現することができる。   According to the present invention, at least the seal sliding surface of the outer peripheral surface of the rotating wheel is subjected to a rust prevention treatment with a predetermined rust prevention treatment material, so that the number of parts is not increased and the processing is efficient. Therefore, it is possible to realize a low-cost bearing unit that can prevent rust.

以下、本発明の一実施の形態に係る軸受ユニットについて、添付図面を参照して説明する。なお、本実施の形態では図１(ａ)の軸受ユニットを想定し、既に上述した内容の説明は省略すると共に、以下の説明では、本実施の形態の特徴部分の説明にとどめる。   Hereinafter, a bearing unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, the bearing unit shown in FIG. 1A is assumed, and the description of the above-described content is omitted. In the following description, only the characteristic part of the present embodiment is described.

図１(ｂ)に示すように、本実施の形態の軸受ユニットにおいて、回転輪４(ハブ１２)の外周表面(表面全体１２Ｍ)のうち、少なくともシール摺動面１２ｍには、所定の防錆処理材で防錆処理が施されている。この場合、防錆処理材としては、撥水性コーティング材を適用可能であり、防錆処理では、撥水性コーティング材をシール摺動面１２ｍにコーティングする。   As shown in FIG. 1B, in the bearing unit according to the present embodiment, at least the seal sliding surface 12m of the outer peripheral surface (the entire surface 12M) of the rotating wheel 4 (hub 12) has a predetermined rust prevention. Rust prevention treatment is applied with the treatment material. In this case, a water-repellent coating material can be applied as the rust-proofing material, and the water-repellent coating material is coated on the seal sliding surface 12m in the rust-proofing treatment.

ここで、防錆処理材(撥水性コーティング材)としては、市販されている例えばフッ素系撥水材、シリコーン系撥水材などを適用すれば良い。また、コーティング方法としては、上述したような防錆処理材(撥水性コーティング材)をシール摺動面１２ｍに例えば吹き付けたり、塗布するなどの方法を適用すれば良い。   Here, as the antirust treatment material (water repellent coating material), for example, a commercially available fluorine water repellent material, silicone water repellent material, or the like may be applied. As a coating method, a method such as spraying or applying a rust-proofing material (water repellent coating material) as described above to the seal sliding surface 12m may be applied.

このような防錆処理によれば、防錆処理材でシール摺動面１２ｍがコーティングされるため、車輪側で跳ね返された例えば泥水がかかるといった環境化で長期間使用された場合でも、シール摺動面１２ｍが錆び付くことは無い。この結果、シールリップ１０ｔとシール摺動面１２ｍとの間のシール性を長期に亘って一定に(良好に)維持することができる。   According to such a rust prevention treatment, since the seal sliding surface 12m is coated with the rust prevention treatment material, even if it is used for a long time in an environment where, for example, muddy water splashed on the wheel side is applied, the seal slide The moving surface 12m does not rust. As a result, the sealing performance between the seal lip 10t and the seal sliding surface 12m can be maintained constant (good) over a long period of time.

また、防錆処理としては、シール摺動面１２ｍに防錆処理材をコーティングするだけで充分であり、従来(図１(ｃ))のようにシール摺動面１２ｍに不錆性の金環２２を嵌着させる必要は無い。このため、従来に比べて簡単な処理で効率的に防錆を図ることができる。更に、従来に比べて軸受の部品点数を軽減することができると共に、金環をシール摺動面１２ｍに嵌着させるための面倒な処理工程も不要となる。このため、軸受の製造効率を向上させることができると共に、軸受の製造コストを大幅に低減することができる。   Further, as the rust-proofing treatment, it is sufficient to coat the seal sliding surface 12m with a rust-proofing material. As in the prior art (FIG. 1 (c)), a non-rusting metal ring 22 is provided on the seal sliding surface 12m. There is no need to fit. For this reason, rust prevention can be aimed at efficiently by simple processing compared with the past. Furthermore, the number of parts of the bearing can be reduced as compared with the prior art, and a troublesome processing step for fitting the metal ring to the seal sliding surface 12m becomes unnecessary. For this reason, while being able to improve the manufacturing efficiency of a bearing, the manufacturing cost of a bearing can be reduced significantly.

また、上述した実施の形態では、シール摺動面１２ｍに防錆処理材をコーティングした例を説明したが、回転輪４(ハブ１２)の外周の表面全体１２Ｍに防錆処理材をコーティングしても良い。なお、回転輪４(ハブ１２)の外周の表面全体１２Ｍとは、少なくともハブ１２の外周表面、ハブフランジ１２ａの外周表面、パイロット部１２ｄの外周表面を含んだ全体表面を指す。   In the above-described embodiment, the example in which the seal sliding surface 12m is coated with the antirust treatment material has been described. However, the entire outer surface 12M of the rotating wheel 4 (hub 12) is coated with the antirust treatment material. Also good. The entire outer peripheral surface 12M of the rotating wheel 4 (hub 12) refers to the entire surface including at least the outer peripheral surface of the hub 12, the outer peripheral surface of the hub flange 12a, and the outer peripheral surface of the pilot portion 12d.

この場合、車輪側構成品(例えば、自動車のディスクホイールやブレーキロータなど)が固定されたハブフランジ１２ａやパイロット部１２ｄの表面は、防錆処理材でコーティングされているため、長期に亘って使用しても錆び付くことは無い。これにより、ハブフランジ１２ａやパイロット部１２ｄの表面に対して車輪側構成品を固着し難くすることができる。この結果、例えば車輪側構成品の交換やメンテナンスの際、当該車輪側構成品をハブフランジ１２ａやパイロット部１２ｄからスムーズに取り外すことが可能となる。   In this case, the surface of the hub flange 12a and the pilot portion 12d to which the wheel side components (for example, a car disc wheel, a brake rotor, etc.) are fixed is coated with a rust-proofing material, so that it can be used for a long time. Even if it does not rust. Thereby, it is possible to make it difficult to fix the wheel side component to the surface of the hub flange 12a or the pilot portion 12d. As a result, for example, when replacing or maintaining the wheel-side component, the wheel-side component can be smoothly removed from the hub flange 12a or the pilot portion 12d.

また、特に静止輪２に最も接近して対向したハブフランジ１２ａの対向面１２ｎは、比較的例えば泥水が付着し易い環境下にさらされるため、長期使用により錆び易いが、上述したように、回転輪４(ハブ１２)の外周の表面全体１２Ｍに防錆処理材をコーティングすることにより、当該対向面１２ｎの防錆を図ることができる。   In particular, the facing surface 12n of the hub flange 12a that is closest to the stationary wheel 2 is exposed to an environment where muddy water is likely to adhere, for example. By coating the entire surface 12M on the outer periphery of the wheel 4 (hub 12) with a rust-proofing material, the opposing surface 12n can be rust-proofed.

なお、回転輪４(ハブ１２)の外周の表面全体１２Ｍに防錆処理材をコーティングする代わりに、例えば回転輪４(ハブ１２)の全体を所定の防錆材料で形成しても同様の効果を実現することができる。この場合、防錆材料としては、例えばＳＵＳ３０４、ＳＵＳ４３０などの各種のステンレス材を適用すれば良い。   In addition, instead of coating the entire outer peripheral surface 12M of the rotating wheel 4 (hub 12) with a rust-proofing material, for example, the same effect can be obtained by forming the entire rotating wheel 4 (hub 12) with a predetermined rust-proofing material. Can be realized. In this case, various types of stainless steel such as SUS304 and SUS430 may be applied as the rust preventive material.

(ａ)は、軸受ユニットの構成を一部拡大して示す断面図、(ｂ)は、防錆処理が施された軸受ユニットの回転輪の構成を一部拡大して示す断面図、(ｃ)は、シール摺動面に不錆性の金環が嵌着された従来の技術を説明するための部分断面図。(a) is a cross-sectional view showing a partially enlarged structure of the bearing unit, (b) is a cross-sectional view showing a partially enlarged structure of a rotating wheel of the bearing unit subjected to rust prevention treatment, (c) ) Is a partial cross-sectional view for explaining a conventional technique in which a non-rusting metal ring is fitted to a seal sliding surface.

符号の説明Explanation of symbols

２ 静止輪
４ 回転輪
6,8 転動体
１０ 車輪側のシール部材
１２ ハブ
１２ａ ハブフランジ
１２ｍ シール摺動面
１２Ｍ 回転輪の表面全体
2 Stationary wheel 4 Rotating wheel
6,8 Rolling element 10 Wheel side seal member 12 Hub 12a Hub flange 12m Seal sliding surface 12M Entire surface of rotating wheel

Claims (4)

車体側に固定されて常時非回転状態に維持される静止輪と、静止輪の内側に対向して設けられ且つ車輪側に接続されて車輪と共に回転する回転輪と、静止輪と回転輪との間に転動自在に組み込まれた複数の転動体と、静止輪と回転輪との間の環状空間を密封するために車体側及び車輪側にそれぞれ設けられたシール部材とを備えた軸受ユニットであって、
車輪側に設けられたシール部材は、その基端が静止輪に固定され、その先端が回転輪の外周表面に形成されたシール摺動面に常時摺接した状態で位置決めされていると共に、回転輪には、その車輪側に、車輪側構成品が固定されるフランジが突設されており、
シール摺動面は、回転輪の外周表面からフランジに移行する部位に形成され且つ静止輪に対向した湾曲面として構成されていると共に、回転輪の外周表面のうち、少なくともシール摺動面には、所定の防錆処理材で防錆処理が施されていることを特徴とする軸受ユニット。 A stationary wheel that is fixed to the vehicle body and is maintained in a non-rotating state at all times, a rotating wheel that is provided facing the inner side of the stationary wheel and that is connected to the wheel side and rotates together with the wheel, and a stationary wheel and a rotating wheel A bearing unit comprising a plurality of rolling elements incorporated in a freely rotatable manner between and a seal member provided on each of a vehicle body side and a wheel side for sealing an annular space between a stationary wheel and a rotating wheel. There,
The seal member provided on the wheel side is positioned with its base end fixed to the stationary wheel and its tip always in sliding contact with the seal sliding surface formed on the outer peripheral surface of the rotating wheel. The wheel is provided with a flange on the wheel side to which the wheel side component is fixed,
The seal sliding surface is formed as a curved surface that is formed at a portion that transitions from the outer peripheral surface of the rotating wheel to the flange and faces the stationary wheel, and at least the seal sliding surface of the outer peripheral surface of the rotating wheel is The bearing unit is subjected to rust prevention treatment with a predetermined rust prevention treatment material. 防錆処理材としては、撥水性コーティング材を適用可能であり、防錆処理では、撥水性コーティング材をシール摺動面にコーティングすることを特徴とする請求項１に記載の軸受ユニット。   The bearing unit according to claim 1, wherein a water-repellent coating material can be applied as the rust-proofing material, and the water-repellent coating material is coated on the seal sliding surface in the rust-proofing treatment. 車体側に固定されて常時非回転状態に維持される静止輪と、静止輪の内側に対向して設けられ且つ車輪側に接続されて車輪と共に回転する回転輪と、静止輪と回転輪との間に転動自在に組み込まれた複数の転動体とを備えた軸受ユニットであって、
回転輪は、全体が所定の防錆材料で形成されていることを特徴とする軸受ユニット。 A stationary wheel that is fixed to the vehicle body and is maintained in a non-rotating state at all times, a rotating wheel that is provided facing the inner side of the stationary wheel and that is connected to the wheel side and rotates together with the wheel, and a stationary wheel and a rotating wheel A bearing unit having a plurality of rolling elements incorporated in a freely rotatable manner between them,
A bearing unit characterized in that the entire rotating wheel is made of a predetermined antirust material. 防錆材料としては、ステンレス材を適用可能であることを特徴とする請求項３に記載の軸受ユニット。
The bearing unit according to claim 3, wherein a stainless material is applicable as the rust preventive material.
JP2006057711A 2006-03-03 2006-03-03 Bearing unit Pending JP2007232175A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8043009B2 (en) * 2006-01-23 2011-10-25 Jtekt Corporation Hub unit, hub unit manufacturing method and hub unit transporting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8043009B2 (en) * 2006-01-23 2011-10-25 Jtekt Corporation Hub unit, hub unit manufacturing method and hub unit transporting method

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