JP4812809B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP4812809B2
JP4812809B2 JP2008155447A JP2008155447A JP4812809B2 JP 4812809 B2 JP4812809 B2 JP 4812809B2 JP 2008155447 A JP2008155447 A JP 2008155447A JP 2008155447 A JP2008155447 A JP 2008155447A JP 4812809 B2 JP4812809 B2 JP 4812809B2
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Prior art keywords
knuckle
outer member
seal
bearing device
wheel
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JP2008230607A (en
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寿志 大槻
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NTN Corp
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NTN 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner 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
    • 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
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/002—Conductive elements, e.g. to prevent static electricity

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Description

この発明は、自動車等の車輪を支持する車輪用軸受装置に関し、特に軽量化を図ったアルミ合金製ナックルに装着する車輪用軸受装置に関する。   The present invention relates to a wheel bearing device for supporting a wheel of an automobile or the like, and more particularly to a wheel bearing device to be mounted on an aluminum alloy knuckle that is reduced in weight.

自動車の懸架装置に対して車輪を回転自在に支持する車輪用軸受装置は、燃費向上のための軽量化が進んでいる。近年、車輪用軸受装置では、さらなる軽量化の追求により、可及的に余肉を排除しスリム化すること、および可鍛鋳鉄等からなるナックルに代え、アルミ合金製ナックルを採用することが普及している。   2. Description of the Related Art A wheel bearing device that rotatably supports a wheel with respect to an automobile suspension device has been reduced in weight for improving fuel efficiency. In recent years, in wheel bearing devices, by pursuing further weight reduction, it has become popular to eliminate the surplus as much as possible, and to adopt a knuckle made of aluminum alloy instead of a knuckle made of malleable cast iron, etc. is doing.

アルミ合金は比重が鋼の略１／３であるから、鋼に比べて不足する剛性を補うために厚肉構造に形成したとしても、少なくとも従来の鋼製ナックルの重量を半減できる。また、アルミ合金特有の課題とされていた肉厚差から生じる巣の発生も、近年の鋳造技術の進歩によって強度に支障のない程度に抑制することが可能となり、将来、アルミ合金製ナックルの普及が拡大すると期待されている。   Since the specific gravity of aluminum alloy is approximately 1/3 that of steel, even if it is formed in a thick-walled structure in order to compensate for insufficient rigidity compared to steel, at least the weight of a conventional steel knuckle can be halved. In addition, the occurrence of nests caused by the difference in wall thickness, which was regarded as a unique issue for aluminum alloys, can be suppressed to the extent that there is no problem in strength due to recent advances in casting technology. Is expected to expand.

図５は従来の車輪用軸受装置を示す縦断面図である。この車輪用軸受装置は、第３世代の内輪回転タイプで、かつ従動輪支持用のものである。この車輪用軸受は、外周に車体取付フランジ３１ａを有する一体の外方部材３１と、ハブ輪３２Ａおよびこのハブ輪３２Ａの端部外径面に嵌合した別体の内輪構成部材３２Ｂからなる内方部材３２と、外方部材３１の内周の複列の転走面３４，３４とこれら転走面３４にそれぞれ対向する内方部材３２の転走面３５，３５との間に介在する複列の転動体３３とを有する。内方部材３２のハブ輪３２Ａは、そのアウトボード側の端部に車輪取付フランジ３２ａを有し、この車輪取付フランジ３２ａには車輪（図示せず）がボルト４８により取付けられる。外方部材３１の車体取付フランジ３１ａは、車体に固定されたアルミ合金製のナックル４４にボルト４９により締結され、これにより車輪がナックル４４に回転自在に支持されている。内外の部材３２，３１間に、形成される環状空間の両端部は、シール３７，３８で密封されており、軸受内部に封入した潤滑グリースの漏洩が防止されると共に、外部からの雨水やダスト等の侵入が防止される。   FIG. 5 is a longitudinal sectional view showing a conventional wheel bearing device. This wheel bearing device is a third generation inner ring rotating type and is for supporting a driven wheel. The wheel bearing includes an inner member 31 having a body mounting flange 31a on the outer periphery, a hub wheel 32A, and a separate inner ring member 32B fitted to the outer diameter surface of the end of the hub wheel 32A. A plurality of rolling surfaces 34, 34 on the inner periphery of the outer member 31 and the rolling surfaces 35, 35 of the inner member 32 facing the rolling surfaces 34, respectively. And rolling elements 33 in a row. The hub wheel 32A of the inner member 32 has a wheel mounting flange 32a at an end on the outboard side, and a wheel (not shown) is mounted to the wheel mounting flange 32a by a bolt 48. The vehicle body mounting flange 31 a of the outer member 31 is fastened by bolts 49 to an aluminum alloy knuckle 44 fixed to the vehicle body, whereby the wheel is rotatably supported by the knuckle 44. Both end portions of the annular space formed between the inner and outer members 32 and 31 are sealed with seals 37 and 38, so that leakage of lubricating grease enclosed in the bearing is prevented, and rainwater and dust from the outside are prevented. Etc. are prevented.

アルミ合金製ナックル４４は軽量化に寄与する反面、鋼材からなる外方部材３１と、金属同士の電位差を生じる材質の関係となる。そのため、外方部材３１におけるナックル４４との当接面に泥塩水等がかかると、電池が形成され、電極腐食が発生する。電極腐食が発生すると、その当接面で固着することがあり、補修点検時の作業性が阻害される。この電極腐食は、絶縁材を介在させると防止することができるが、部品点数が増加し、そのため部品管理が煩雑となるうえ、車輪用軸受装置のナックルへの組付けに手間がかかる。
また、車輪のタイヤに蓄積された静電気は、内方部材３２から、転動体３３、外方部材３１およびナックル４４を介して車体に流れるが、内方部材３２および外方部材３１の転走面３４，３５と転動体３３との間で潤滑油膜が不十分なときに、この部分でスパークが発生し、車両に搭載されたラジオにノイズが発生するという問題点が有る。 The aluminum alloy knuckle 44 contributes to weight reduction, but has an outer member 31 made of steel and a material that generates a potential difference between metals. Therefore, when muddy salt water or the like is applied to the contact surface of the outer member 31 with the knuckle 44, a battery is formed and electrode corrosion occurs. When electrode corrosion occurs, it may stick to the contact surface, impairing workability during repair inspection. This electrode corrosion can be prevented by interposing an insulating material, but the number of parts increases, so that parts management becomes complicated, and it takes time to assemble the wheel bearing device to the knuckle.
The static electricity accumulated in the tires of the wheels flows from the inner member 32 to the vehicle body via the rolling elements 33, the outer member 31 and the knuckle 44, but the rolling surfaces of the inner member 32 and the outer member 31. When a lubricating oil film is insufficient between the rolling elements 33 and 35 and the rolling element 33, there is a problem in that sparks are generated in this portion and noise is generated in the radio mounted on the vehicle.

この発明の目的は、アルミ合金製としたナックルに装着する車輪用軸受装置において、部品点数を増加することなく、ナックルとの当接面での電極腐食を防止することである。 この発明の他の目的は、内外の部材の転走面と転動体との間でスパークが発生することを、部品点数を増加することなく防止し、そのスパークに起因するラジオノイズを無くすことである。   An object of the present invention is to prevent electrode corrosion at a contact surface with a knuckle without increasing the number of parts in a wheel bearing device mounted on a knuckle made of an aluminum alloy. Another object of the present invention is to prevent the occurrence of sparks between the rolling surfaces of the inner and outer members and the rolling elements without increasing the number of parts, and to eliminate radio noise caused by the sparks. is there.

この発明の車輪用軸受装置は、アルミ合金製のナックルに固定するための車体取付フランジを外周に有し、内周に複列の転走面を有する鋼製の外方部材と、一端に車輪取付フランジを有し、上記転走面のそれぞれに対向する転走面を形成した内方部材と、これら対向する転走面間に介在させた複列の転動体とを備え、上記外方部材の外径面部分にナックルが外嵌し、且つ車体取付フランジの側面がナックルの側面に当接した状態で、上記外方部材の車体取付フランジがナックルに取付けられ、車体に対して車輪を回転自在に支持する車輪用軸受装置において、上記外方部材のナックルが外嵌する外径面部分および上記車体取付フランジの側面にわたって電気絶縁性の皮膜層を設けたものである。
外方部材は、一般に鋼材が使用されるため、これを取付けるナックルがアルミ合金製であると、互いに電位差を生じる金属材同士の関係となる。しかし、外方部材のナックルとの当接面が電気絶縁性の皮膜層で覆われているため、アルミ合金製のナックルと鋼製の外方部材との当接面に泥塩水等がかかっても、電池が形成されることがなく、電極腐食が防止される。また皮膜層を設けるため、別部材の絶縁材を介在させる場合と異なり、部品点数の増加がなく、部品管理の煩雑化や組付け性の低下が回避される。
なお、上記絶縁性の皮膜層は、外方部材のナックルとの当接面における全体に設けても良く、また一部だけに設けても良い。 The wheel support bearing assembly of the present invention, has a body mounting flange for fixing the aluminum alloy of the knuckle on the outer periphery, and the steel of the outer member to the inner peripheral that have a rolling surface of the double row, one end Each having a wheel mounting flange and an inner member formed with a rolling surface facing each of the rolling surfaces, and a double row rolling element interposed between the facing rolling surfaces , fitted around the knuckle is on the outer diameter surface portion of the square member, and in a state where the side surface of the body mounting flange is in contact with the side surface of the knuckle, body mounting flange of the outer member is attached to the knuckle for vehicles body In a wheel bearing device for rotatably supporting a wheel, an electrically insulating coating layer is provided over an outer diameter surface portion where a knuckle of the outer member is fitted and a side surface of the vehicle body mounting flange .
Since the steel member is generally used for the outer member, if the knuckle to which the outer member is attached is made of an aluminum alloy, the outer member has a relationship between metal materials that cause a potential difference. However, since the contact surface of the outer member with the knuckle is covered with an electrically insulating coating layer, mud salt water is applied to the contact surface of the aluminum alloy knuckle and the steel outer member. However, a battery is not formed, and electrode corrosion is prevented. In addition, since the coating layer is provided, the number of parts is not increased, unlike in the case of interposing an insulating material as a separate member, and the complication of parts management and the deterioration of assembly are avoided.
The insulating coating layer may be provided on the entire contact surface of the outer member with the knuckle or may be provided on only a part thereof.

上記皮膜層は、外方部材のナックルが外嵌する外径面部分および車体取付フランジの側面にわたって設ける。ナックルは、外方部材の外径面に嵌合して車体取付フランジの側面に取付けられるため、上記のように外径面部分および車体取付フランジの側面にわたって設けることにより、当接面の全体の腐食防止が行える。
上記皮膜層は、めっき層の上にコーティングしたもの、またはコーティング層単独であっても良い。コーティング層は、樹脂コーティング層であっても、また塗膜層であっても良い。コーティング層とすると、簡単に皮膜層の形成が行える。
上記皮膜層は、静電粉体塗装の層であっても良い。 It said coating layer is provided over the side surface of the outer diameter surface portion and a body mounting flange to the knuckle of the outer member is fitted. Since the knuckle is fitted to the outer diameter surface of the outer member and attached to the side surface of the vehicle body mounting flange, by providing the knuckle over the outer diameter surface portion and the side surface of the vehicle body mounting flange as described above, Can prevent corrosion.
The coating layer may be a coating on a plating layer or a coating layer alone. The coating layer may be a resin coating layer or a coating layer. When a coating layer is used, a coating layer can be easily formed.
The coating layer may be an electrostatic powder coating layer.

この発明において、上記外方部材と内方部材間の環状空間の端部を密封するインボード側およびアウトボード側のシールを設け、これらシールのうち、少なくとも片方のシールを、導電性のある弾性材料で摺接する接触式のシールとしても良い。
シールを導電性のものとすると、内方部材と外方部材間の電流は、シールを通じて流れることになる。すなわち、タイヤで発生した静電気は、内方部材からシールを介して外方部材に流れ、外方部材からナックルへの取付用のボルトを介してナックルへ流れ、車体へ逃がされることになる。そのため、内外の部材の転走面と転動体の間で潤滑油膜が不十分であっても、この部分でスパークが発生することがなく、このようなスパークに起因して車両に搭載されたラジオにノイズが入るのを防止することができる。また、シールを利用して通電を行わせるため、通電用の別の部材が不要で、部品点数が少なくて済む。
なお、駆動輪用の車輪用軸受装置の場合は、内方部材に接続された等速ジョイントを介して車体に逃がされるため、内方部材と外方部材との間の電位差は生じ難い。従動輪用の車輪用軸受装置は、上記のような等速ジョイントを介した電流の逃がし経路が得られないため、シールを導電性のものとするノイズ対策は、従動輪用の車輪用軸受装置の場合に、特に効果的である。 In the present invention, an inboard side and an outboard side seal for sealing the end of the annular space between the outer member and the inner member are provided, and at least one of these seals is made of conductive elastic. It is good also as a contact-type seal slidably contacted with material.
If the seal is conductive, the current between the inner member and the outer member will flow through the seal. That is, the static electricity generated in the tire flows from the inner member to the outer member through the seal, flows from the outer member to the knuckle via the bolt for attaching to the knuckle, and is released to the vehicle body. Therefore, even if the lubricating oil film is insufficient between the rolling surfaces of the inner and outer members and the rolling elements, no spark is generated in this portion, and the radio mounted on the vehicle due to such sparks. It is possible to prevent noise from entering. Further, since energization is performed using a seal, another member for energization is not necessary, and the number of parts can be reduced.
In the case of a wheel bearing device for driving wheels, the potential difference between the inner member and the outer member is unlikely to occur because the vehicle body escapes through a constant velocity joint connected to the inner member. Since the wheel bearing device for the driven wheel cannot obtain a current release path through the constant velocity joint as described above, the noise countermeasure that makes the seal conductive is the wheel bearing device for the driven wheel. This is particularly effective.

上記導電性のある弾性材料を用いたシールは、上記外方部材または内方部材に取付けられる導電性の芯金と、この芯金に固着された弾性材料とでなるものとしても良い。芯金を有するシールを用いると、シールが堅固に取付けられて接触が安定する。
また、上記シールのうち、インボード側のシールは、上記導電性のある弾性材料を用いたシールとし、このシールは、外方部材に取付けられてリップ部が、内方部材に取付けられた導電性のスリンガに接触するものとしても良い。この場合も、導電性のシールの接触の安定性が得易い。 The seal using the conductive elastic material may be composed of a conductive core attached to the outer member or the inner member and an elastic material fixed to the core. When a seal having a mandrel is used, the seal is firmly attached and contact is stabilized.
Of the above seals, the inboard side seal is a seal using the conductive elastic material, and this seal is attached to the outer member and the lip portion is attached to the inner member. It may be in contact with the sex slinger. Also in this case, the contact stability of the conductive seal is easily obtained.

この発明の車輪用軸受装置は、ナックルに固定するための車体取付フランジを外周に有し、内周に複列の転走面を有する鋼製の外方部材と、一端に車輪取付フランジを有し、上記転走面のそれぞれに対向する転走面を形成した内方部材と、これら対向する転走面間に介在させた複列の転動体とを備え、上記外方部材の外径面部分にナックルが外嵌し、且つ車体取付フランジの側面がナックルの側面に当接した状態で、上記外方部材の車体取付フランジがナックルに取付けられ、車体に対して車輪を回転自在に支持する車輪用軸受装置において、上記外方部材のナックルが外嵌する外径面部分および上記車体取付フランジの側面にわたって電気絶縁性の皮膜層を設けたため、アルミ合金製のナックルを用いながら、部品点数を増加することなく、ナックルとの当接面での電極腐食を防止することができる。
上記外方部材と内方部材間の環状空間の端部を密封するインボード側およびアウトボード側のシールのうち、少なくとも片方のシールを、導電性のある弾性材料で摺接する接触式のシールとした場合は、タイヤで発生した静電気等により、転走面と転動体間でスパークが発生することを防止でき、部品点数を増加することなく、スパークに起因するラジオノイズを無くすことができる。 Wheel support bearing assembly of the invention has a body mounting flange for fixing to a knuckle on the outer periphery, and the steel of the outer member to the inner peripheral that have a rolling surface of the double row, the wheel mounting flange at one end An inner member formed with a rolling surface facing each of the rolling surfaces, and a double row rolling element interposed between the facing rolling surfaces , and the outer member knuckle fitted around the circumferential surface portion, and in a state where the side surface of the body mounting flange is in contact with the side surface of the knuckle, body mounting flange of the outer member is attached to the knuckle, rotatable wheel relative vehicle body In the wheel bearing device to be supported, since an electrically insulating coating layer is provided over the outer diameter surface portion on which the knuckle of the outer member is fitted and the side surface of the vehicle body mounting flange, while using an aluminum alloy knuckle, Without increasing the number of parts It is possible to prevent the electrode corrosion at contact surface with the knuckle.
Of the inboard side and outboard side seals that seal the end of the annular space between the outer member and the inner member, at least one of the seals is a contact-type seal that is in sliding contact with a conductive elastic material; In this case, it is possible to prevent a spark from being generated between the rolling surface and the rolling element due to static electricity generated in the tire, and it is possible to eliminate the radio noise caused by the spark without increasing the number of parts.

この発明の一実施形態を図１ないし図４と共に説明する。この実施形態の車輪用軸受装置は、内輪回転タイプで、かつ従動輪支持用のものである。この車輪用軸受装置は、内周に複列の転走面４を有する外方部材１と、これら転走面４にそれぞれ対向する転走面５を有する内方部材２と、これら複列の転走面４，５間に介在させた複列の転動体３とを備える。転動体３はボールからなり、各列毎に保持器６で保持されている。各転走面４，５は、断面が円弧状であって、背面合わせとなるように接触角が形成され、この車輪用軸受装置は複列のアンギュラ玉軸受とされている。内外の部材２，１間に形成される環状空間のアウトボード側およびインボード側の各開口端部は、それぞれ接触式のシール７，８で密封されている。   An embodiment of the present invention will be described with reference to FIGS. The wheel bearing device of this embodiment is an inner ring rotating type and is for supporting a driven wheel. The wheel bearing device includes an outer member 1 having double-row rolling surfaces 4 on the inner periphery, an inner member 2 having rolling surfaces 5 respectively facing the rolling surfaces 4, and the double-rows. A double row rolling element 3 interposed between the rolling surfaces 4 and 5. The rolling elements 3 are formed of balls and are held by the cage 6 for each row. Each of the rolling surfaces 4 and 5 has a circular arc cross section, and a contact angle is formed so as to be back-to-back, and this wheel bearing device is a double row angular ball bearing. The open end portions on the outboard side and the inboard side of the annular space formed between the inner and outer members 2 and 1 are sealed with contact-type seals 7 and 8, respectively.

外方部材１は、固定側の部材となるものであって、ナックル１４に固定するための車体取付フランジ１ａを、外周における軸方向の中間位置に有する。車体取付フランジ１ａは、円周方向の複数箇所に取付孔２１を有している。取付孔２１はねじ孔とされている。
内方部材２は、回転側の部材となるものであって、車輪取付フランジ２ａを有するハブ輪２Ａと、このハブ輪２Ａの端部外径に嵌合した別体の内輪構成部材２Ｂとで構成されている。ハブ輪２Ａおよび内輪構成部材２Ｂに各列の転走面５がそれぞれ形成される。車輪取付フランジ２ａは内方部材２のアウトボード側端部に位置しており、図１に示すように、この車輪取付フランジ２ａに、ブレーキロータ１５を介して車輪１６がボルト１８で取付けられている。内輪構成部材２Ｂは、ハブ輪２Ａのインボード側端部に設けられた加締部でハブ輪２Ａに軸方向に締め付け固定される。 The outer member 1 is a member on the fixed side, and has a vehicle body mounting flange 1a for fixing to the knuckle 14 at an intermediate position in the axial direction on the outer periphery. The vehicle body mounting flange 1a has mounting holes 21 at a plurality of locations in the circumferential direction. The attachment hole 21 is a screw hole.
The inner member 2 is a rotating member, and includes a hub wheel 2A having a wheel mounting flange 2a and a separate inner ring component 2B fitted to the outer diameter of the end of the hub wheel 2A. It is configured. Each row of rolling surfaces 5 is formed on the hub wheel 2A and the inner ring component 2B. The wheel mounting flange 2a is located at the end of the inner member 2 on the outboard side. As shown in FIG. 1, the wheel 16 is attached to the wheel mounting flange 2a via the brake rotor 15 with bolts 18. Yes. The inner ring constituent member 2B is fastened and fixed in the axial direction to the hub wheel 2A by a crimping portion provided at an inboard side end of the hub wheel 2A.

ナックル１４は、車体（図示せず）に取付けられた部材であって、軸受嵌合孔１４ａを有し、この軸受嵌合孔１４ａの外周に沿う周方向複数箇所に、ボルト挿通孔１４ｂが設けられている。外方部材１は、外径面における車体取付フランジ１ａよりもインボード側の部分がナックル１４の軸受取付孔１４ａに嵌合し、車体取付フランジ１ａがナックル１４の側面に当接する状態で、ボルト１９（図１）によりナックル１４に取付けられる。ボルト１９は、ナックル１４のボルト挿通孔１４ｂに挿通され、ねじ軸部分が車体取付フランジ１ａの取付孔２１に螺合する。
ナックル１４は、アルミ合金製である。車輪用軸受装置の外方部材１、内方部材２、および転動体３は、炭素鋼または高炭素クロム鋼等の鋼製である。 The knuckle 14 is a member attached to a vehicle body (not shown) and has a bearing fitting hole 14a. Bolt insertion holes 14b are provided at a plurality of locations in the circumferential direction along the outer periphery of the bearing fitting hole 14a. It has been. The outer member 1 is a bolt in a state in which a portion of the outer diameter surface on the inboard side of the vehicle body mounting flange 1a is fitted in the bearing mounting hole 14a of the knuckle 14 and the vehicle body mounting flange 1a is in contact with the side surface of the knuckle 14. It attaches to the knuckle 14 by 19 (FIG. 1). The bolt 19 is inserted into the bolt insertion hole 14b of the knuckle 14, and the screw shaft portion is screwed into the attachment hole 21 of the vehicle body attachment flange 1a.
The knuckle 14 is made of an aluminum alloy. The outer member 1, the inner member 2, and the rolling element 3 of the wheel bearing device are made of steel such as carbon steel or high carbon chrome steel.

図２に示すように、外方部材１におけるナックル１４との当接面には、電気絶縁性の皮膜層１７が設けられている。この皮膜層１７は、外方部材１の外径面におけるナックル１４が外嵌する外径面部分、および車体取付フランジ１ａのナックル当接側となる片側の側面にわたり、連続して設けられている。すなわち、皮膜層１７は、外方部材１の外径面覆い部分１７ａと、フランジ覆い部分１７ｂとを有する。皮膜層１７は、めっき層の上にコーティング層を設けたもの、またはコーティング層の単独からなる。コーティング層は、例えば合成樹脂層であっても良く、また塗料を塗布した塗膜層であっても良い。皮膜層１７を、めっき層の上にコーティング層を設けたものとする場合、例えば、クロメート処理皮膜等のめっき層の上に、低温熱硬化型コーティング層を設けたものとしてもよい。上記低温熱硬化型コーティング層には一液性低温熱硬化型コーティング材等が用いられる。また、皮膜層１７は、静電粉体塗装で形成したものであっても良い。この静電粉体塗装には、例えば粉体型焼付エポキシ塗料、アクリル塗料、溶剤型焼付アクリル塗料、アミノアルキド塗料等が用いられる。   As shown in FIG. 2, an electrically insulating coating layer 17 is provided on the contact surface of the outer member 1 with the knuckle 14. The coating layer 17 is continuously provided over the outer diameter surface portion of the outer diameter surface of the outer member 1 on which the knuckle 14 is fitted and the side surface on one side which is the knuckle contact side of the vehicle body mounting flange 1a. . That is, the coating layer 17 has an outer diameter surface covering portion 17a of the outer member 1 and a flange covering portion 17b. The coating layer 17 is composed of a plating layer provided with a coating layer or a single coating layer. The coating layer may be, for example, a synthetic resin layer, or may be a coating layer coated with a paint. When the coating layer 17 is provided with a coating layer on the plating layer, for example, a low-temperature thermosetting coating layer may be provided on the plating layer such as a chromate treatment coating. A one-component low-temperature thermosetting coating material or the like is used for the low-temperature thermosetting coating layer. The coating layer 17 may be formed by electrostatic powder coating. For this electrostatic powder coating, for example, powder-type baking epoxy coating, acrylic coating, solvent-type baking acrylic coating, aminoalkyd coating, and the like are used.

図２のＡ部を拡大して図３に示す。同図のように、アウトボード側のシール７は、導電性の芯金９と、この芯金９に固着された導電性の弾性部材１０とで構成されている。芯金９は円筒部９ａと立板部９ｂとを有し、シール７は、芯金９の円筒部９ａを外方部材１の内径面に嵌合させることで、外方部材１に取付けられている。芯金９は例えば鋼材からなり、弾性部材１０は例えば導電性ゴム材からなる。この導電性ゴム材は、体積固有抵抗値が３０×１０3 Ω・ｃｍ以下のものが好ましい。弾性部材１０は、内方部材２の外周における車輪取付フランジ２ａの近傍に先端が接触する複数のリップ部１０ａ，１０ｂ，１０ｃが形成されている。一つのリップ部１０ａは軸方向の内側へ延び、他の２つのリップ部１０ｂ，１０ｃは、外側へ延びている。このシール７により、内外の部材２，１間の環状空間のアウトボード側の開口端部での、軸受内部からの封入潤滑グリースの漏出と、外部からの雨水やダスト等の侵入が防止される。   The A part of FIG. 2 is enlarged and shown in FIG. As shown in the drawing, the seal 7 on the outboard side is composed of a conductive core 9 and a conductive elastic member 10 fixed to the core 9. The cored bar 9 has a cylindrical part 9 a and a standing plate part 9 b, and the seal 7 is attached to the outer member 1 by fitting the cylindrical part 9 a of the cored bar 9 to the inner diameter surface of the outer member 1. ing. The core metal 9 is made of, for example, a steel material, and the elastic member 10 is made of, for example, a conductive rubber material. This conductive rubber material preferably has a volume specific resistance of 30 × 10 3 Ω · cm or less. The elastic member 10 is formed with a plurality of lip portions 10 a, 10 b, and 10 c that are in contact with the tip of the elastic member 10 in the vicinity of the wheel mounting flange 2 a on the outer periphery of the inner member 2. One lip portion 10a extends inward in the axial direction, and the other two lip portions 10b and 10c extend outward. The seal 7 prevents leakage of encapsulated lubricating grease from the inside of the bearing and intrusion of rainwater, dust and the like from the outside at the open end of the annular space between the inner and outer members 2 and 1 on the outboard side. .

図４は、図２のＢ部を拡大して示す。同図のように、インボード側のシール８は、導電性の芯金１１と、この芯金１１に固着された導電性の弾性部材１２とで構成される。芯金１１は、円周部１１ａと立板部１１ｂとでなる断面Ｌ字状に形成されている。シール８は、芯金１１の円周部１１ａを外方部材１の内径面に嵌合させることで、外方部材１に取付けられている。芯金１１は例えば鋼材からなり、弾性部材１２は例えば導電性ゴム材からなる。この導電性ゴム材は、体積固有抵抗値３０×１０3 Ω・ｃｍ以下のものが好ましい。弾性部材１２は、内方部材２の外径面に嵌合させた導電性のスリンガ１３に先端が接触する複数のリップ部１２ａ，１２ｂ，１２ｃが形成されている。スリンガ１３は例えばステンレス鋼等の鋼製とされる。スリンガ１３は、円周部１３ａと立板部１３ｂとでなり、その円周部１３ａを内方部材２の外径面に嵌合させることで、内方部材２に取付けられている。弾性部材１２における上記シール８の複数のリップ部１２ａ〜１２ｃのうち、一部のリップ部１２ａ，１２ｂはスリンガ１３の円周部１３ａに接触し、他のリップ部１２ｃはスリンガ１３の立板部１３ｂに接触している。このシール８により、内外の部材２，１間の環状空間のインボード側の開口端部での、軸受内部からの封入潤滑グリースの漏出と、外部からの雨水やダスト等の侵入が防止される。   FIG. 4 shows an enlarged view of part B of FIG. As shown in the figure, the inboard-side seal 8 is composed of a conductive core 11 and a conductive elastic member 12 fixed to the core 11. The core metal 11 is formed in an L-shaped cross section including a circumferential part 11a and a standing plate part 11b. The seal 8 is attached to the outer member 1 by fitting the circumferential portion 11 a of the core metal 11 to the inner diameter surface of the outer member 1. The core metal 11 is made of, for example, a steel material, and the elastic member 12 is made of, for example, a conductive rubber material. This conductive rubber material preferably has a volume resistivity of 30 × 10 3 Ω · cm or less. The elastic member 12 is formed with a plurality of lip portions 12 a, 12 b, 12 c whose tips contact the conductive slinger 13 fitted to the outer diameter surface of the inner member 2. The slinger 13 is made of steel such as stainless steel. The slinger 13 includes a circumferential portion 13a and a standing plate portion 13b, and is attached to the inner member 2 by fitting the circumferential portion 13a to the outer diameter surface of the inner member 2. Among the plurality of lip portions 12 a to 12 c of the seal 8 in the elastic member 12, some lip portions 12 a and 12 b are in contact with the circumferential portion 13 a of the slinger 13, and the other lip portion 12 c is a standing plate portion of the slinger 13. 13b is in contact. The seal 8 prevents leakage of encapsulated lubricating grease from the inside of the bearing and intrusion of rainwater, dust, and the like from the outside at the opening end on the inboard side of the annular space between the inner and outer members 2 and 1. .

この構成の車輪用軸受装置によると、外方部材１とナックル１４とは、外方部材１が鋼材であり、ナックル１４がアルミ合金製であるため、互いに電位差を生じる金属材同士の関係となる。しかし、外方部材１のナックル１４との当接面が電気絶縁性の皮膜層１７で覆われているため、上記当接面に泥塩水等がかかっても、電池が成形されることがない。したがって、上記当接面に電極腐食が生じることが防止される。また皮膜層１７を設けるため、別部材の絶縁材を介在させる場合と異なり、部品点数の増加がなく、部品管理の煩雑化や組付け性の低下が回避される。   According to the wheel bearing device of this configuration, the outer member 1 and the knuckle 14 are in a relationship between metal materials that cause a potential difference from each other because the outer member 1 is a steel material and the knuckle 14 is made of an aluminum alloy. . However, since the contact surface of the outer member 1 with the knuckle 14 is covered with the electrically insulating coating layer 17, the battery is not molded even when the contact surface is covered with muddy salt water or the like. . Therefore, electrode corrosion is prevented from occurring on the contact surface. In addition, since the coating layer 17 is provided, the number of parts is not increased, unlike in the case of interposing an insulating material as a separate member, and complication of parts management and a decrease in assemblability are avoided.

また、シール７，８が導電性のものであるため、内方部材２と外方部材１間の電流は、シール７，８を通じて流れることになる。すなわち車輪６のタイヤで発生した静電気は、内方部材２からシール７，８を介して外方部材１に流れ、外方部材１からナックル１４への取付用のボルト１９を介してナックル１４へ流れ、車体へ逃がされることになる。そのため、外方部材１と内方部材２の転走面４，５と転動体３の間で潤滑油膜が不十分であっても、この部分でスパークが発生することがなく、このようなスパークに起因して車両に搭載されたラジオにノイズが入るのを防止することができる。また、シール７，８を利用して通電を行わせるため、通電用の別の部材を設けることが不要で、部品点数が少なくて済む。   Further, since the seals 7 and 8 are conductive, the current between the inner member 2 and the outer member 1 flows through the seals 7 and 8. That is, static electricity generated in the tire of the wheel 6 flows from the inner member 2 to the outer member 1 through the seals 7 and 8, and to the knuckle 14 from the outer member 1 to the knuckle 14 via the mounting bolt 19. It will flow to the car body. Therefore, even if the lubricating oil film is insufficient between the rolling surfaces 4 and 5 of the outer member 1 and the inner member 2 and the rolling element 3, no spark is generated in this portion. It is possible to prevent noise from entering the radio mounted on the vehicle due to the above. Further, since energization is performed using the seals 7 and 8, it is not necessary to provide another member for energization, and the number of parts can be reduced.

なお、上記実施形態では、インボード側とアウトボード側の両方のシール７，８を導電性としたが、これら両シール７，８の一方だけを導電性としても、上記のラジオノイズ防止効果が得られる。
また、上記実施形態では、絶縁性の皮膜層１７は、外方部材１のナックル１４との当接面における全体に設けたが、参考提案例として、この当接面における一部だけに絶縁性の皮膜層１７を設けても良い。例えば、参考提案例として、絶縁性の皮膜層１７は、外方部材１の外径面部分だけに設けても、また車輪取付フランジ１ａの側面だけに設けても良い。また、絶縁性の皮膜層１７を一部だけに設ける場合に、外方部材１のナックル１４との当接面における上記皮膜層１７を設けない部分に、絶縁性のシートや板材等の別の絶縁材（図示せず）を介在させることで、皮膜層１７と、これとは別の絶縁材とを併用しても良い。例えば、外方部材１の外径面だけに皮膜層１７を設け、車輪取付フランジ１ａの側面とナックル１４との間に上記別の絶縁材を介在させても良い。
さらに、上記実施形態は、車輪用軸受装置が第３世代の軸受である場合につき説明したが、この発明は、車体取付フランジを外周に有し、内周に複列の転走面を有する外方部材と、一端に車輪取付フランジを有し、上記転走面のそれぞれに対向する転走面を形成した内方部材と、これら対向する転走面間に介在させた複列の転動体とを備えた車輪用軸受装置であれば、適用することができる。転動体３は、ボールに限らず、円すいころであっても良い。

In the above embodiment, both the seals 7 and 8 on the inboard side and the outboard side are made conductive. However, even if only one of the seals 7 and 8 is made conductive, the above-described radio noise prevention effect can be obtained. can get.
In the above embodiment, the insulating coating layer 17 is provided on the whole of the contact surface of the knuckle 14 of the outer member 1, as a reference Proposed Example, insulation only part of the contact surface of this A conductive coating layer 17 may be provided. For example, as a reference Proposed Example, insulation of the coating layer 17, it is provided only on the outer diameter surface portion of the outer member 1, or may be provided only on the side surface of the wheel mounting flange 1a. Further, when the insulating film layer 17 is provided only in a part, another portion such as an insulating sheet or a plate material is provided on a portion where the film layer 17 is not provided on the contact surface of the outer member 1 with the knuckle 14. By interposing an insulating material (not shown), the coating layer 17 and another insulating material may be used in combination. For example, the coating layer 17 may be provided only on the outer diameter surface of the outer member 1, and the other insulating material may be interposed between the side surface of the wheel mounting flange 1 a and the knuckle 14.
Furthermore, although the said embodiment demonstrated about the case where the wheel bearing apparatus is a 3rd generation bearing, this invention has the vehicle body attachment flange in the outer periphery, and the outer side which has a double row rolling surface in an inner periphery. An inner member having a wheel mounting flange at one end and forming a rolling surface facing each of the rolling surfaces, and a double row rolling element interposed between the facing rolling surfaces, If it is a wheel bearing device provided with, it is applicable. The rolling element 3 is not limited to a ball but may be a tapered roller.

この発明の一実施形態にかかる車輪用軸受装置による従動輪支持構造を示す断面図である。It is sectional drawing which shows the driven wheel support structure by the wheel bearing apparatus concerning one Embodiment of this invention. 同車輪用軸受装置の断面図である。It is sectional drawing of the bearing apparatus for the wheels. 図２におけるＡ部のシール構造を示す拡大断面図である。It is an expanded sectional view which shows the seal structure of the A section in FIG. 図２におけるＢ部のシール構造を示す拡大断面図である。It is an expanded sectional view which shows the seal structure of the B section in FIG. 従来例の断面図である。It is sectional drawing of a prior art example.

符号の説明Explanation of symbols

１…外方部材
１ａ…車体取付フランジ
２…内方部材
２ａ…車輪取付フランジ
３…転動体
４，５…転走面
７，８…シール
９…芯金
１０…弾性部材
１０ａ〜１０ｃ…リップ部
１１…芯金
１２…弾性部材
１２ａ〜１２ｃ…リップ部
１３…スリンガ
１４…アルミ合金製のナックル
１７…皮膜層 DESCRIPTION OF SYMBOLS 1 ... Outer member 1a ... Car body mounting flange 2 ... Inner member 2a ... Wheel mounting flange 3 ... Rolling elements 4, 5 ... Rolling surfaces 7, 8 ... Seal 9 ... Core metal 10 ... Elastic members 10a-10c ... Lip part DESCRIPTION OF SYMBOLS 11 ... Core metal 12 ... Elastic members 12a-12c ... Lip part 13 ... Slinger 14 ... Knuckle 17 made of aluminum alloy ... Film layer

Claims (6)

アルミ合金製のナックルに固定するための車体取付フランジを外周に有し、内周に複列の転走面を有する鋼製の外方部材と、一端に車輪取付フランジを有し、上記転走面のそれぞれに対向する転走面を形成した内方部材と、これら対向する転走面間に介在させた複列の転動体とを備え、上記外方部材の外径面部分にナックルが外嵌し、且つ車体取付フランジの側面がナックルの側面に当接した状態で、上記外方部材の車体取付フランジがナックルに取付けられ、車体に対して車輪を回転自在に支持する車輪用軸受装置において、
上記外方部材のナックルが外嵌する外径面部分および上記車体取付フランジの側面にわたって電気絶縁性の皮膜層を設けたことを特徴とする車輪用軸受装置。 Has a body mounting flange for fixing the aluminum alloy of the knuckle on the outer periphery has a steel outer member that have a rolling surface of the double row on the inner periphery, the wheel mounting flange at one end, the An inner member formed with a rolling surface facing each of the rolling surfaces, and a double row rolling element interposed between the facing rolling surfaces, and a knuckle on an outer diameter surface portion of the outer member wheels but externally fitted, and in a state where the side surface of the body mounting flange is in contact with the side surface of the knuckle, body mounting flange of the outer member is attached to the knuckle, for rotatably supporting the wheel relative to vehicle body In the bearing device,
A wheel bearing device, wherein an electrically insulating coating layer is provided over an outer diameter surface portion into which a knuckle of the outer member is fitted and a side surface of the vehicle body mounting flange . 請求項１において、上記皮膜層は、めっき層の上にコーティングしたもの、またはコーティング層単独である車輪用軸受装置。 The wheel bearing device according to claim 1, wherein the coating layer is a coating on a plating layer or a coating layer alone. 請求項１において、上記皮膜層は、静電粉体塗装の層である車輪用軸受装置。 2. The wheel bearing device according to claim 1, wherein the coating layer is an electrostatic powder coating layer. 請求項１ないし請求項３のいずれか１項において、上記外方部材と内方部材間の環状空間の端部を密封するインボード側およびアウトボード側のシールを設け、これらシールのうち、少なくとも片方のシールを、導電性のある弾性材料で摺接する接触式のシールとした車輪用軸受装置。 The inboard side and outboard side seals for sealing the end of the annular space between the outer member and the inner member are provided in any one of claims 1 to 3 , and at least of these seals A wheel bearing device in which one of the seals is a contact-type seal that is in sliding contact with a conductive elastic material. 請求項４において、上記導電性のある弾性材料を用いたシールは、上記外方部材または内方部材に取付けられる導電性の芯金と、この芯金に固着された弾性材料とでなる車輪用軸受装置。 5. The wheel seal according to claim 4, wherein the seal using the conductive elastic material includes a conductive metal core attached to the outer member or the inner member and an elastic material fixed to the metal core. Bearing device. 請求項４または請求項５において、インボード側のシールを、上記導電性のある弾性材料を用いたシールとし、このシールは、外方部材に取付けられてリップ部が、内方部材に取付けられた導電性のスリンガに接触するものとした車輪用軸受装置。 6. The seal according to claim 4 or 5, wherein the seal on the inboard side is a seal using the conductive elastic material, and the seal is attached to the outer member and the lip portion is attached to the inner member. Wheel bearing device that is in contact with a conductive slinger.
JP2008155447A 2008-06-13 2008-06-13 Wheel bearing device Expired - Lifetime JP4812809B2 (en)

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JPS5510111A (en) * 1978-07-04 1980-01-24 Nippon Seiko Kk Roller bearing for preventing electrolytic corrosion
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JP2001080307A (en) * 1999-09-09 2001-03-27 Ntn Corp Wheel bearing device
JP2001221243A (en) * 2000-02-09 2001-08-17 Nsk Ltd Rolling bearing unit for supporting wheel
JP2002021862A (en) * 2000-07-03 2002-01-23 Nsk Ltd Rolling bearing device
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