JP5200418B2 - Bearing unit - Google Patents

Bearing unit Download PDF

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JP5200418B2
JP5200418B2 JP2007124832A JP2007124832A JP5200418B2 JP 5200418 B2 JP5200418 B2 JP 5200418B2 JP 2007124832 A JP2007124832 A JP 2007124832A JP 2007124832 A JP2007124832 A JP 2007124832A JP 5200418 B2 JP5200418 B2 JP 5200418B2
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wheel
wheel side
hub
flange
bearing unit
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JP2008279861A (en
JP2008279861A5 (en
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徹 竹原
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B3/00—Disc wheels, i.e. wheels with load-supporting disc body
    • B60B3/14—Attaching disc body to hub ; Wheel adapters
    • B60B3/16—Attaching disc body to hub ; Wheel adapters by bolts or the like
    • 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
    • F16C33/581—Raceways; Race rings integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/10—Reduction of
    • B60B2900/141—Corrosions
    • 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)

Description

本発明は、車輪を支えるフランジを備えた軸受ユニットに関する。   The present invention relates to a bearing unit including a flange that supports a wheel.

従来から、自動車の車輪（例えば、ディスクホイールＤＷ）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５に示された軸受ユニット１は、車体側に固定される外輪（静止輪）２と、外輪２の内側に対向して設けられ且つ車輪側に接続（固定）されて車輪と共に回転する内輪（回転輪）３と、外輪２と内輪３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４，５とを備えている。 2. Description of the Related Art Conventionally, various bearing units for supporting a vehicle wheel (for example, a disc wheel DW) rotatably with respect to a vehicle body (for example, a suspension device (suspension)) are known.
For example, the bearing unit 1 shown in FIG. 5 is provided facing the inner side of the outer ring 2 (stationary wheel) 2 fixed to the vehicle body side and connected (fixed) to the wheel side and rotates together with the wheel. An inner ring (rotating wheel) 3 and a plurality of rolling elements 4 and 5 rotatably incorporated in a double row (for example, two rows) are provided between the outer ring 2 and the inner ring 3.

外輪２は、略円筒形に形成されるとともに、その内周面には、複数の外輪側軌道面を並設して備え、その外周面には、外方に向かって突出して一体成形された固定フランジ２ａを備えている。その固定フランジ２ａの固定孔２ｂには、固定用ボルト（図示しない）を挿入し、これを車体側のハウジング（図示しない）に締結することで、外輪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。   The outer ring 2 is formed in a substantially cylindrical shape, and is provided with a plurality of outer ring side raceway surfaces arranged side by side on its inner circumferential surface, and is integrally molded to project outward on the outer circumferential surface. A fixed flange 2a is provided. A fixing bolt (not shown) is inserted into the fixing hole 2b of the fixing flange 2a and fastened to a housing (not shown) on the vehicle body side, thereby fixing the outer ring 2 to a suspension device (knuckle) not shown. can do.

内輪３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ー）を支持しつつ共に回転する略円筒形状のハブ６と、ハブ６の外周面の車体側（図中矢印Ｂ側）に嵌め合わされた内輪構成体７とを備え、その外周面に、複数の内輪側軌道面を並設して備えている。
また、前記外輪側軌道面と内輪側軌道面間には、複数の転動体４，５が配されている。
なお、ハブ６の車体側端部には締結ナットNが螺合することにより、前記内輪構成体７と一体に締結されるとともに、前記転動体４，５に予圧が付与されている。
The inner ring 3 is fitted to a substantially cylindrical hub 6 that rotates while supporting a wheel-side component (for example, a disc wheel or a brake rotor of an automobile) and a vehicle body side (an arrow B side in the figure) of the outer peripheral surface of the hub 6. And a plurality of inner ring-side raceway surfaces arranged side by side on the outer peripheral surface thereof.
Further, a plurality of rolling elements 4 and 5 are arranged between the outer ring side raceway surface and the inner ring side raceway surface.
A fastening nut N is screwed to the end of the hub 6 on the vehicle body side, so that the hub 6 is fastened integrally with the inner ring constituting body 7 and a preload is applied to the rolling elements 4 and 5.

ハブ６の車輪側（図中矢印Ｗ側）からは、外輪２を越えて外方（ハブ６の半径方向外側）に向って延出された円板状のハブフランジ８が突設され、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孔８１が設けられている。さらに、その複数のハブボルト孔８１の内周面には雌ネジ８２が刻設されている。
なお、車輪側構成品（ディスクホイールやブレーキローター）の取り付け孔に通されたハブボルト（図示しない）が、前記ハブボルト孔８１に螺合して締結されることによって、ハブ６と車輪側構成品が一体に固定される。
また、ハブフランジ８の車輪側端面８ａの中心側には、パイロット部Ｐが円筒状に延出して形成されている。 From the wheel side of the hub 6 (the arrow W side in the figure), a disk-shaped hub flange 8 is provided protruding beyond the outer ring 2 and outward (radially outward of the hub 6). In the vicinity of the extending edge, a plurality of hub bolt holes 81 arranged at predetermined intervals along the circumferential direction are provided. Further, a female screw 82 is engraved on the inner peripheral surface of the plurality of hub bolt holes 81.
A hub bolt (not shown) passed through a mounting hole of a wheel side component (disc wheel or brake rotor) is screwed into the hub bolt hole 81 and fastened, so that the hub 6 and the wheel side component are connected. It is fixed integrally.
A pilot portion P is formed in a cylindrical shape on the center side of the wheel side end surface 8a of the hub flange 8.

また、外輪２が回転輪となる例として、例えば、図６に示すハブユニット軸受では、車体側に固定される内輪（静止輪）３と、内輪３の外側に対向して設けられ且つ車輪側に接続（固定）されて車輪と共に回転する外輪（回転輪）２と、外輪２と内輪３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４，５とを備えている。   Further, as an example in which the outer ring 2 is a rotating wheel, for example, in the hub unit bearing shown in FIG. 6, an inner ring (stationary wheel) 3 fixed to the vehicle body side and an outer side of the inner ring 3 are provided facing the wheel side. An outer ring (rotating wheel) 2 that is connected (fixed) to the wheel and rotated together with the wheels, and a plurality of rolling elements 4 and 5 that are rotatably incorporated between the outer ring 2 and the inner ring 3 in a double row (for example, two rows). It has.

外輪２は、略円筒形に形成されるとともに、その内周面には、複数の外輪側軌道面を並設して備えられている。また、外輪２の外周面の車輪側（図中矢印Ｗ側）からは、外輪２を越えて外方（外輪２の半径方向外側）に向って延出された円板状のハブフランジ８が突設され、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孔８１が設けられている。このハブボルト孔８１の内周面には雌ネジ８２が刻設されており、ハブボルト孔８１には、前述した内輪が回転輪となるハブユニット軸受と同様に、車輪側構成品（ディスクホイールやブレーキローター）を固定可能なハブボルトが螺合可能となっている。
また、ハブフランジ８の車輪側端面８ａの中心側には、パイロット部Ｐが、車輪側に向けて、円筒状に延出して形成されている。このパイロット部Ｐの外径側は、車輪側構成品をハブフランジ８に固定する際に、車輪側構成品の内径側端部が引っ掛けられることにより、車輪側構成品の位置決めを容易にしている。
内輪３は、複数個の内輪構成体（６，７）で構成され、その外周面に、複数の内輪側軌道面を並設して備えている。さらに、前記外輪側軌道面と内輪側軌道面間に複数の転動体４，５が配されている。
The outer ring 2 is formed in a substantially cylindrical shape, and a plurality of outer ring side raceways are provided side by side on the inner peripheral surface thereof. Further, a disc-shaped hub flange 8 extending from the wheel side (arrow W side in the figure) of the outer peripheral surface of the outer ring 2 to the outside (radially outward of the outer ring 2) beyond the outer ring 2 is provided. A plurality of hub bolt holes 81 arranged in a predetermined interval along the circumferential direction are provided near the extended edge. A female screw 82 is engraved on the inner peripheral surface of the hub bolt hole 81. Like the hub unit bearing in which the inner ring is a rotating wheel, the hub bolt bearing 81 has a wheel side component (disc wheel or brake). The hub bolt that can fix the rotor can be screwed together.
A pilot portion P is formed on the center side of the wheel side end face 8a of the hub flange 8 so as to extend in a cylindrical shape toward the wheel side. The outer diameter side of the pilot portion P facilitates the positioning of the wheel-side component by hooking the inner-diameter side end of the wheel-side component when the wheel-side component is fixed to the hub flange 8. .
The inner ring 3 is composed of a plurality of inner ring structural bodies ( 6, 7 ), and a plurality of inner ring side raceways are provided in parallel on the outer peripheral surface thereof. Further, a plurality of rolling elements 4 and 5 are arranged between the outer ring side raceway surface and the inner ring side raceway surface.

上述した２例では、ハブボルト孔８１にハブボルトが螺合することによって、車輪側構成品が挟持されて固定されているが、その他の例として、ハブボルト孔８１にハブボルトが圧入されており、ハブボルトにハブナットが螺合することによって車輪側構成品を挟持して固定可能にする構成もある。   In the two examples described above, the hub bolt is screwed into the hub bolt hole 81 so that the wheel side component is clamped and fixed. As another example, the hub bolt is press-fitted into the hub bolt hole 81 and There is also a configuration in which the wheel side component can be clamped and fixed by screwing the hub nut.

ところで、従来から、自動車の操縦安定性向上のためには、懸架装置に懸架される部材の重量が軽くなること、つまり、バネ下荷重の軽減が効果的であることから、車輪側構成品をアルミやチタンなどの軽合金で形成する場合が多くなってきた。
一方、上述したハブフランジ軸受は、通常、鋼で形成されているので、軽合金と鋼の標準電位に大きな差が生じてしまう。このように標準電位に差がある材料同士が接触している場合において、その接触面に電導体である液体（例えば水）が介在すると、材料同士が電流をともなって著しく腐食する現象、いわゆる電食現象が発生する。 By the way, conventionally, in order to improve the driving stability of an automobile, the weight of a member suspended on a suspension device is reduced, that is, the reduction of unsprung load is effective. In many cases, it is formed of a light alloy such as aluminum or titanium.
On the other hand, since the hub flange bearing described above is usually formed of steel, a large difference occurs between the standard potentials of the light alloy and the steel. When materials having a difference in standard potential are in contact with each other as described above, if a liquid (for example, water) as a conductor is present on the contact surface, the material is significantly corroded with current, so-called electric current. An eating phenomenon occurs.

そこで、特許文献１では、軽金属製の車輪側構成品（アルミ合金製のブレーキローター）とハブフランジとの間に電食防止皮膜を設けて、電食現象を防止した技術が開示されている。この場合には、ブレーキローターとハブフランジとの間の電食現象は防止することができるが、鋼製のハブボルトを使用した場合には、ハブボルトと軽金属製の車輪側構成品との間で電食現象が生じてしまう。
また、軽金属製の車輪側構成品にアルマイト等で表面処理をして絶縁性をもたせた場合であっても、ハブボルトやナットで車輪側構成品を締結する際に、これらのハブボルトやナットが触る部分の表面処理が剥がされて、絶縁性が損なわれることにより上記の不都合が発生する場合がある。 Therefore, Patent Document 1 discloses a technique in which an electrolytic corrosion prevention film is provided between a light metal wheel side component (aluminum alloy brake rotor) and a hub flange to prevent an electrolytic corrosion phenomenon. In this case, the electric corrosion phenomenon between the brake rotor and the hub flange can be prevented. However, when a steel hub bolt is used, electric corrosion is caused between the hub bolt and the light metal wheel side component. An eating phenomenon will occur.
In addition, even when light metal wheel side components are surface treated with alumite or the like to provide insulation, these hub bolts and nuts touch when fastening the wheel side components with hub bolts and nuts. The above-mentioned inconvenience may occur due to the surface treatment of the portion being peeled off and the insulation being impaired.

軽金属製の車輪側構成品とハブボルトとの間で電食現象が生じた場合には、まず、軽合金製の車輪側構成品の酸化現象が生じる。これにより、車輪側構成品の体積が増加することから、ハブボルトの軸力が上昇してしまう。このとき、熱処理や硬化処理が行なわれていないハブボルトであれば、水素イオンが蓄積されることによって脆弱化してしまう。また、酸化した軽金属イオンが流出した場合には、車輪側構成品がやせ細る現象が生じ、その結果、ハブボルトの軸力が低下して、緩みが生じてしまう。   When an electrolytic corrosion phenomenon occurs between the light metal wheel side component and the hub bolt, first, an oxidation phenomenon of the light alloy wheel side component occurs. Thereby, since the volume of the wheel side component increases, the axial force of the hub bolt increases. At this time, if the hub bolt is not subjected to heat treatment or hardening treatment, it is weakened by the accumulation of hydrogen ions. In addition, when oxidized light metal ions flow out, a phenomenon occurs in which the wheel-side components are thinned, resulting in a decrease in the axial force of the hub bolt and loosening.

そこで、軽金属製の車輪側構成品を取り付ける際に、硬化チタン等の軽金属製のハブボルトを使用することにより、車輪側構成品とハブボルトとの間の電食現象を防止することができると思われる。
ところが、軽金属製のハブボルトは、鋼製のハブフランジに取り付けられるので、ハブボルトとハブフランジとの間の電食現象を防止する必要に迫られることとなった。
この場合、ハブボルトがハブフランジのハブボルト取り付け孔に圧入されて、車輪側構成品をハブナットによって固定する構成であれば、ハブボルトの圧入部分に電食防止皮膜を介在させることによって電食現象を防止することが可能である。
しかし、ハブボルト孔８１にハブボルトが螺合することによって、車輪側構成品が挟持されて固定される構成の場合には、雄ネジや雌ネジに電食防止皮膜を設けても、螺合時に高面圧となるため、電食防止皮膜が破壊され易く、電食現象を防止することが困難であった。そこで、ハブボルト孔８１にハブボルトが螺合する構成において、電食現象を防止する技術が望まれるが、現在そのような技術は見当たらない。
Therefore, it seems that the electric corrosion phenomenon between the wheel side component and the hub bolt can be prevented by using a light metal hub bolt such as hardened titanium when mounting the light metal wheel side component. .
However, since light metal hub bolts are attached to steel hub flanges, it is necessary to prevent electrolytic corrosion between the hub bolts and the hub flange.
In this case, if the hub bolt is press-fitted into the hub bolt mounting hole of the hub flange and the wheel side component is fixed by the hub nut, the electrolytic corrosion phenomenon is prevented by interposing an electrolytic corrosion prevention film on the press-fitted portion of the hub bolt. it is possible.
However, in the case where the wheel side component is clamped and fixed by screwing the hub bolt into the hub bolt hole 81, even if an electrolytic corrosion prevention film is provided on the male screw or the female screw, it is difficult to Due to the contact pressure, the electrolytic corrosion prevention film is easily broken, and it is difficult to prevent the electrolytic corrosion phenomenon. Therefore, a technique for preventing the electrolytic corrosion phenomenon is desired in the configuration in which the hub bolt is screwed into the hub bolt hole 81, but such a technique is not found at present.

特開２００５−２３９０２６号公報JP 2005-239026 A

本発明の目的は、ハブボルト孔にハブボルトが螺合することによって、車輪側構成品が挟持されて固定される構成の軸受ユニットにおいて、ハブボルト孔とハブボルトとの間の電食現象を防止した軸受ユニットを提供することである。   An object of the present invention is to provide a bearing unit in which a wheel-side component is sandwiched and fixed by screwing a hub bolt into a hub bolt hole, in which the electrolytic corrosion phenomenon between the hub bolt hole and the hub bolt is prevented. Is to provide.

上記課題を達成するために、本発明が成した手段は、車体側に固定される静止輪と、静止輪に対向して設けられ且つ車輪側に配された車輪側構成品が固定されて車輪と共に回転する回転輪と、当該回転輪と静止輪のそれぞれの対向面に形成される軌道面間に転動自在に組み込まれた複数の転動体と、回転輪から外方に向かって延出された円板状のハブフランジとを備え、ハブフランジには、周方向に沿って所定間隔で孔が、当該フランジの車輪側から車体側にわたって貫通して形成されており、当該孔に対してハブボルトを車輪側から挿入することで、車輪側構成品をハブフランジに固定する軸受ユニットにおいて、孔には、前記ハブボルトが螺合可能な内径面を有する円筒部材が嵌合されているとともに、円筒部材は、ハブフランジの車体側の端面に加締め固定されており、前記車輪側構成品とハブボルトと円筒部材は、互いに同一の材質である軽合金で形成されていることを特徴とする軸受ユニットとしたことである。その円筒部材の車輪側の端面は、フランジの車輪側の端面と同一平面上に位置付けられている場合もあり、フランジの車輪側の端面から所定量だけ、車輪側に向けて突出している場合もあり、フランジの車輪側の端面に沿って延在し、互いに連結している場合もある。さらに、円筒部材の車輪側の端面には、車輪側構成品をハブフランジに固定する際の位置決めとして、車輪側に向けて延出した延出部が一体形成されている場合もある。また、ハブフランジの孔に嵌合する円筒部材の嵌合面には、絶縁防錆加工が施されている場合もある。
In order to achieve the above-mentioned object, the present invention comprises a stationary wheel fixed to the vehicle body side, and a wheel side component provided opposite to the stationary wheel and disposed on the wheel side to which the wheel is fixed. A rotating wheel that rotates together with each other, a plurality of rolling elements that are rotatably incorporated between raceway surfaces that are formed on opposite surfaces of the rotating wheel and the stationary wheel, and extending outward from the rotating wheel. A disc-shaped hub flange, and a hole is formed in the hub flange at predetermined intervals along the circumferential direction from the wheel side of the flange to the vehicle body side. by inserting from the wheel side, in the bearing unit to secure the wheel-side components to the hub flange, the hole, together with the hub bolts are fitted into the cylindrical member having a threaded inner diameter capable of surface, the cylindrical member The hub flange body Of being in the end face caulking, the wheel-side components and the hub bolts and the cylindrical member is to have the bearing unit, characterized in that it is formed by light alloy which is the same material with each other. The end surface on the wheel side of the cylindrical member may be positioned on the same plane as the end surface on the wheel side of the flange, or may protrude from the end surface on the wheel side of the flange by a predetermined amount toward the wheel side. Yes, it extends along the end face of the flange on the wheel side and may be connected to each other. Furthermore, an extension portion extending toward the wheel side may be integrally formed on the end surface of the cylindrical member on the wheel side as positioning when the wheel side component is fixed to the hub flange. In some cases , the mating surface of the cylindrical member that fits into the hole of the hub flange is subjected to insulation / rust prevention.

本発明によれば、ハブボルト孔にハブボルトが螺合することによって、車輪側構成品が挟持されて固定される構成の軸受ユニットにおいて、ハブボルト孔とハブボルトとの間の電食現象を防止した軸受ユニットを提供することができる。   According to the present invention, in a bearing unit in which a wheel side component is clamped and fixed by screwing a hub bolt into the hub bolt hole, a bearing unit that prevents an electrolytic corrosion phenomenon between the hub bolt hole and the hub bolt. Can be provided.

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、添付図面に基づいて説明する。なお、本実施形態の軸受ユニットは、ハブボルト孔の構成に特徴を有し、軸受ユニットの全体構成は、上述した従来の軸受ユニット（図５及び図６参照）の全体構成と同様であるので、同一の符号を用いることでその説明を省略し、ここではその特徴的な構成を中心に説明する。
本実施形態による軸受ユニット１では、図１（ａ）〜（ｃ）に示すように、ハブフランジ８の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孔８１に、それぞれ、円筒部材（インサート）９が嵌合して配されている。
具体的には、インサート９の車輪側９１の端面９５は、ハブフランジ８の車輪側の端面８ａと同一平面上に位置付けられている。一方、インサート９の車体側９２は、ハブボルト孔８１の車体側（図中矢印Ｂ側）端面８ｃから突出するとともに該端面８ｃに加締められて圧接固定されている。 Hereinafter, a bearing unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. The bearing unit of the present embodiment is characterized by the configuration of the hub bolt hole, and the overall configuration of the bearing unit is the same as the overall configuration of the conventional bearing unit described above (see FIGS. 5 and 6). The description will be omitted by using the same reference numerals, and the characteristic configuration will be mainly described here.
In the bearing unit 1 according to the present embodiment, as shown in FIGS. 1A to 1C, a plurality of hub bolt holes 81 arranged at predetermined intervals along the circumferential direction of the hub flange 8 are respectively cylindrical members ( Insert) 9 is fitted and arranged.
Specifically, the end surface 95 on the wheel side 91 of the insert 9 is positioned on the same plane as the end surface 8 a on the wheel side of the hub flange 8. On the other hand, the vehicle body side 92 of the insert 9 protrudes from the end surface 8c of the hub bolt hole 81 on the vehicle body side (arrow B side in the figure) and is crimped and fixed to the end surface 8c.

インサート９は、ハブフランジ８の厚み寸法（車輪側端面８ａから車体側端面８ｂまでの寸法）よりも大きな軸方法長寸法を有しており、その車輪側９１には、インサート９の胴部９４の外径よりも大径に形成された鍔部９３が備えられている。
インサート９の胴部９４の内径寸法は、ハブボルト径よりも僅かに小径に設定されるとともに、胴部９４から鍔部９３にわたる内径面にはハブボルト（図示しない）が螺合可能な雌ネジ８２が形成されている。
一方、ハブボルト孔８１の車輪側（図中矢印Ｗ側）には、鍔部９３が嵌合可能な段部８ｂが形成されている。 The insert 9 has an axial length that is larger than the thickness dimension of the hub flange 8 (the dimension from the wheel-side end surface 8a to the vehicle body-side end surface 8b). A flange portion 93 having a larger diameter than the outer diameter is provided.
The inner diameter dimension of the body portion 94 of the insert 9 is set to be slightly smaller than the hub bolt diameter, and a female screw 82 to which a hub bolt (not shown) can be screwed is formed on the inner surface extending from the body portion 94 to the flange portion 93. Is formed.
On the other hand, on the wheel side of the hub bolt hole 81 (the arrow W side in the figure), a step portion 8b into which the flange portion 93 can be fitted is formed.

ハブボルト孔８１にインサート９を嵌合する場合には、車輪側から鍔部９３が段部８ｂに当接するまでインサート９をハブボルト孔８１に嵌め入れる。このとき、ハブボルト孔８１から車体側（図中矢印Ｂ側）に突出したインサート９の車体側端部９ａを加締めて、ハブフランジ８の車体側端面８ｃに圧接することで、インサート９がハブボルト孔８１に回転不能かつ堅牢に固定される。
なお、本実施形態では、車輪側構成品とハブボルト及びインサート９は同一の材質、例えば軽合金で形成されており、ハブフランジ８は鋼で形成されている。この場合、ハブボルト孔８１とインサート９との電食現象を防止するため、ハブボルト孔８１とインサート９との嵌合面には、絶縁防錆加工が施される。その絶縁防錆加工は、例えば、ハブボルト孔８１側に亜鉛ニッケルクロメート（Ｚｎ−Ｎｉクロメート）後のトップコートを塗布したり、ダクロ処理を施したりしても良い。或いは、インサート９の嵌合面にシーリング材を塗布しても良い。 When the insert 9 is fitted into the hub bolt hole 81, the insert 9 is fitted into the hub bolt hole 81 from the wheel side until the flange portion 93 comes into contact with the stepped portion 8b. At this time, the vehicle body side end portion 9a of the insert 9 protruding from the hub bolt hole 81 toward the vehicle body side (arrow B side in the figure) is crimped and pressed against the vehicle body side end surface 8c of the hub flange 8 so The hole 81 cannot be rotated and is firmly fixed.
In the present embodiment, the wheel side component, the hub bolt and the insert 9 are made of the same material, for example, a light alloy, and the hub flange 8 is made of steel. In this case, in order to prevent the electrolytic corrosion phenomenon between the hub bolt hole 81 and the insert 9, the mating surface between the hub bolt hole 81 and the insert 9 is subjected to an insulation rust prevention process. The insulation rust prevention processing may apply the top coat after zinc nickel chromate (Zn-Ni chromate) to the hub bolt hole 81 side, or may perform dacro processing, for example. Alternatively, a sealing material may be applied to the fitting surface of the insert 9.

このように、ハブフランジ８の周方向に沿って所定間隔で形成された複数のハブボルト孔８１に、それぞれ、インサート９が固定されたことにより、車輪側構成品とハブボルトとインサート９は、ともに軽金属製であって同一の材質であり、その標準電位の差が小さいので、ハブボルトとインサート９の間に電食現象が生じることがない。
この場合、軽金属製のインサート９と鋼製のハブフランジ８は、互いに異なる材質となり、その標準電位に大きな差が生じ得る状態となるが、ハブボルト孔８１とインサート９との嵌合面は絶縁防錆加工が施されているので、ハブボルト孔８１とインサート９の間に電食現象が生じることはない。
また、インサート９は、ハブボルト孔８１に回転不能かつ堅牢に固定されているので、ハブボルトをインサート９に螺合させた際でも、その螺合力によってインサート９がハブボルト孔８１に対して相対的に回転することがなく、ハブボルト孔８１とインサート９と絶縁防錆加工の効果が損なわれることがない。
（変形例１） As described above, since the insert 9 is fixed to each of the plurality of hub bolt holes 81 formed at predetermined intervals along the circumferential direction of the hub flange 8, the wheel side component, the hub bolt, and the insert 9 are all made of light metal. Since they are made of the same material and have a small difference in standard potential, no electrolytic corrosion occurs between the hub bolt and the insert 9.
In this case, the insert 9 made of light metal and the hub flange 8 made of steel are made of different materials and may have a large difference in standard potential, but the fitting surface between the hub bolt hole 81 and the insert 9 is insulated. Since rust processing is performed, no electrolytic corrosion occurs between the hub bolt hole 81 and the insert 9.
Further, since the insert 9 is fixed firmly to the hub bolt hole 81 so as not to rotate, the insert 9 rotates relative to the hub bolt hole 81 by the screwing force even when the hub bolt is screwed to the insert 9. The effect of the hub bolt hole 81, the insert 9, and the insulation rust prevention process is not impaired.
(Modification 1)

本変形例１として、図２（ａ）〜（ｃ）に示すように、インサート９の車輪側の端面９５をフランジ８の車輪側の端面８ａから所定量だけ車輪側に向けて突出させても良い。ここでは、一例として、ハブボルト孔８１に嵌合するインサート９の鍔部９３を車輪側に向けて突出させている。なお、所定量については、例えば、フランジ８の大きさや内輪側構成品の形状や軸受の使用目的・使用環境に応じて任意に設定しているので、ここでは特に数値限定をしない。   As shown in FIGS. 2 (a) to 2 (c), as the first modification, the end surface 95 on the wheel side of the insert 9 may protrude from the end surface 8 a on the wheel side of the flange 8 toward the wheel side by a predetermined amount. good. Here, as an example, the flange portion 93 of the insert 9 fitted into the hub bolt hole 81 is projected toward the wheel side. The predetermined amount is arbitrarily set in accordance with, for example, the size of the flange 8, the shape of the inner ring side component, the purpose of use and the use environment of the bearing, and is not specifically limited here.

このように、鍔部９３を車輪側に突出させたことにより、ハブフランジ８に車輪側構成品を固定した場合には、車輪側構成品が、突出した鍔部９３と当接することで、車輪側構成品のハブフランジ側の面（図示せず）と、ハブフランジ８の車輪側端面８ａとの間には、鍔部９３の突出量に応じた隙間が構成される。
これにより、鋼製のハブフランジ８と軽合金製の車輪側構成品が直接接触することがないので、ハブフランジ８と車輪側構成品との間に電食現象が生じることがない。
その他の構成及び効果は上述した実施形態と同様であるのでその説明は省略する。
（変形例２） In this way, when the wheel side component is fixed to the hub flange 8 by projecting the flange portion 93 toward the wheel side, the wheel side component contacts the protruding flange portion 93 so that the wheel A gap corresponding to the protrusion amount of the flange portion 93 is formed between the hub flange side surface (not shown) of the side component and the wheel side end surface 8 a of the hub flange 8.
As a result, the steel hub flange 8 and the light alloy wheel-side component do not come into direct contact with each other, so that no electrolytic corrosion occurs between the hub flange 8 and the wheel-side component.
Since other configurations and effects are the same as those of the above-described embodiment, the description thereof is omitted.
(Modification 2)

本変形例２として、図３（ａ）〜（ｃ）に示すように、上記変形例１で突出させた鍔部９３の端面９５をフランジ８の車輪側の端面８ａに沿って延在させ、互いに連結させても良い。ここでは、一例として、突出させた鍔部９３同士をフランジ８の車輪側の端面８ａに沿って互いに連結させている。なお、連結させる形状としては、例えば円環状、直線状（矩形状）などとしてもよいが、一例として、円環状に連結させた場合には、当該鍔部９３の端面９５は、円環状の突出面となる。
この場合、円環状に連結された突出面９５の範囲（領域）は、例えば、ハブフランジ８の車輪側端面８ａ全体にわたって延在させてもよいし、インサート９の径寸法（幅）だけを互いに連結させるようにしても良い。 As shown in FIGS. 3A to 3C, as the second modification, the end surface 95 of the flange portion 93 protruded in the first modification is extended along the wheel-side end surface 8 a of the flange 8. They may be connected to each other. Here, as an example, the protruding flanges 93 are connected to each other along the wheel-side end surface 8 a of the flange 8. The shape to be connected may be, for example, an annular shape or a linear shape (rectangular shape), but as an example, when connected in an annular shape, the end surface 95 of the flange portion 93 has an annular protrusion. It becomes a surface.
In this case, for example, the range (region) of the projecting surfaces 95 connected in an annular shape may extend over the entire wheel side end surface 8a of the hub flange 8, or only the diameter dimension (width) of the insert 9 may be set to each other. You may make it connect.

このように鍔部９３を連結したことによって、ハブフランジ８に車輪側構成品を固定した場合には、車輪側構成品の車輪側の面は、鍔部９３で形成された突出面９５と当接し、ハブフランジ８とは接触しない。
このとき、車輪側構成品と突出面９５は、ともに軽金属製であって同一の材質であり、その標準電位の差が小さいので、車輪側構成品と突出面９５との間に電食現象が生じることがない。
これにより、鋼製のハブフランジ８の車輪側端面８ａと軽合金製の車輪側構成品とは完全に絶縁され、直接接触することがないので、ハブフランジ８と車輪側構成品との間に電食現象が生じることがない。
その他の構成及び効果は上述した実施形態と同様であるのでその説明は省略する。
（変形例３） When the wheel side component is fixed to the hub flange 8 by connecting the flange portion 93 in this way, the wheel side surface of the wheel side component is in contact with the protruding surface 95 formed by the flange portion 93. In contact with the hub flange 8.
At this time, the wheel-side component and the protruding surface 95 are both made of light metal and made of the same material, and the difference in standard potential is small, so that the electric corrosion phenomenon occurs between the wheel-side component and the protruding surface 95. It does not occur.
As a result, the wheel-side end face 8a of the steel hub flange 8 and the light alloy wheel-side component are completely insulated and do not come into direct contact with each other, so that there is no direct contact between the hub flange 8 and the wheel-side component. There is no electric corrosion.
Since other configurations and effects are the same as those of the above-described embodiment, the description thereof is omitted.
(Modification 3)

本変形例３として、図４（ａ）〜（ｃ）に示すように、上記変形例２で連続させた端面９５に、車輪側構成品をハブフランジ８に固定する際の位置決めとして、車輪側に向けて延出した延出部を一体形成しても良い。ここでは、一例として、延出部Ｐ２は、鍔部９３の円環状の突出面９５の内径端から、車輪側に向けて円筒状に延出している。
この場合、延出部Ｐ２は、ハブフランジ８のパイロット部となるので、ハブフランジ８の車輪側端面８ａの中心側にはパイロット部Ｐが不要となる（図４（ａ）参照）が、延出部Ｐ２の内径側にパイロット部Ｐを残しても良い。 As the third modification, as shown in FIGS. 4A to 4C, as the positioning when the wheel side component is fixed to the hub flange 8 on the end face 95 continued in the second modification, the wheel side An extending portion extending toward the end may be integrally formed. Here, as an example, the extending portion P2 extends in a cylindrical shape from the inner diameter end of the annular projecting surface 95 of the flange portion 93 toward the wheel side.
In this case, since the extension part P2 becomes a pilot part of the hub flange 8, the pilot part P is unnecessary on the center side of the wheel side end face 8a of the hub flange 8 (see FIG. 4A). The pilot portion P may be left on the inner diameter side of the protruding portion P2.

本変形例３では、変形例２の構成に加えて、延出部Ｐ２を設けたことで、車輪側構成品の車体側の面は、すべて、ハブフランジ８に接することはない。
具体的には、車輪側構成品の車体側の面は、前述の変形例２と同様に、前記円環状の突出面９５と当接し、さらに、車輪側構成品の内径端は、延出部Ｐ２の外径周面に引っ掛けられて当接するが、車輪側構成品と突出面９５と延出部Ｐ２は、ともに軽金属製であって同一の材質であり、その標準電位の差が小さいので、電食現象が生じることがない。
これにより、鋼製のハブフランジ８の車輪側端面８ａと軽合金製の車輪側構成品とが完全に絶縁され、直接接触することがないので、ハブフランジ８と車輪側構成品との間に電食現象が生じることがない。
また、延出部Ｐ２を形成したことによって、ハブフランジ８に車輪側構成品を固定する場合には、円筒状の延出部Ｐ２の外径周面に車輪側構成品の内径側端部を引っ掛けて車輪側構成品の位置決めをすることができる。 In the third modification, in addition to the structure of the second modification, the extension portion P2 is provided, so that the vehicle body side surfaces of the wheel side components do not all come into contact with the hub flange 8.
Specifically, the surface on the vehicle body side of the wheel-side component is in contact with the annular projecting surface 95 as in the above-described second modification, and the inner diameter end of the wheel-side component is an extension portion. The wheel side component, the projecting surface 95 and the extension part P2 are both made of light metal and made of the same material, and the difference in standard potential is small. There is no electric corrosion.
As a result, the wheel-side end face 8a of the steel hub flange 8 and the light alloy wheel-side component are completely insulated and do not come into direct contact with each other, so that there is no direct contact between the hub flange 8 and the wheel-side component. There is no electric corrosion.
Further, when the wheel side component is fixed to the hub flange 8 by forming the extension portion P2, the inner diameter side end of the wheel side component is provided on the outer peripheral surface of the cylindrical extension portion P2. The wheel side component can be positioned by hooking.

なお、上述した各変形例では、インサート９の車輪側の端面９５がフランジ８の車輪側の端面８ａから所定量だけ車輪側に向けて突出した構成を示したが、これに限られず、上記変形例２及び変形例３で形成した端面（突出面）９５の突出形状に合わせて、インサート９の車輪側の端面９５を掘り込むことにより、端面（突出面）９５が、ハブフランジ８の車輪側の端面８ａと同一平面上に位置付けられるようにしても良い。   In addition, in each modification mentioned above, although the end surface 95 of the wheel side of the insert 9 showed the structure which protruded toward the wheel side by the predetermined amount from the wheel side end surface 8a of the flange 8, it is not restricted to this, The said deformation | transformation is shown. By digging the end surface 95 on the wheel side of the insert 9 in accordance with the projecting shape of the end surface (projecting surface) 95 formed in Example 2 and Modification 3, the end surface (projecting surface) 95 becomes the wheel side of the hub flange 8. It may be positioned on the same plane as the end face 8a.

また、上述した本実施形態および各変形例では、内輪回転の軸受ユニットを想定して説明したが、外輪回転の軸受ユニット（図６参照）にも適用可能である。また、上述した本実施形態および各変形例では、駆動輪側の軸受ユニットを想定して説明したが、従動輪側の軸受ユニットにも適用可能である。   Further, in the above-described embodiment and each modification, the bearing unit for rotating the inner ring has been described, but the present invention can also be applied to a bearing unit for rotating the outer ring (see FIG. 6). Further, in the above-described embodiment and each modification, the description has been made assuming the bearing unit on the driving wheel side, but the present invention can also be applied to the bearing unit on the driven wheel side.

本発明による軸受ユニットの構成を示す説明断面図であり、（ａ）は軸受ユニットの概略断面図、（ｂ）はハブフランジの車体側側面の説明図、（ｃ）はハブフランジのインサート嵌合部分周辺の構成を示す拡大断面図。It is explanatory sectional drawing which shows the structure of the bearing unit by this invention, (a) is a schematic sectional drawing of a bearing unit, (b) is explanatory drawing of the vehicle body side side surface of a hub flange, (c) is insert fitting of a hub flange. The expanded sectional view which shows the structure of a part periphery. 本発明による軸受ユニット変形例１の構成を示す説明断面図であり、（ａ）は軸受ユニットの概略断面図、（ｂ）はハブフランジの車体側側面の説明図、（ｃ）はハブフランジのインサート嵌合部分周辺の構成を示す拡大断面図。It is explanatory sectional drawing which shows the structure of the bearing unit modification 1 by this invention, (a) is a schematic sectional drawing of a bearing unit, (b) is explanatory drawing of the vehicle body side side surface of a hub flange, (c) is a hub flange side figure. The expanded sectional view which shows the structure of an insert fitting part periphery. 本発明による軸受ユニット変形例２の構成を示す説明断面図であり、（ａ）は軸受ユニットの概略断面図、（ｂ）はハブフランジの車体側側面の説明図、（ｃ）はハブフランジのインサート嵌合部分周辺の構成を示す拡大断面図。It is explanatory sectional drawing which shows the structure of the bearing unit modification 2 by this invention, (a) is a schematic sectional drawing of a bearing unit, (b) is explanatory drawing of the vehicle body side side surface of a hub flange, (c) is a hub flange side figure. The expanded sectional view which shows the structure of an insert fitting part periphery. 本発明による軸受ユニット変形例３の構成を示す説明図であり、（ａ）は軸受ユニットの概略断面図、（ｂ）はハブフランジの車体側側面の説明断面図、（ｃ）はハブフランジのインサート嵌合部分周辺の構成を示す拡大断面図。It is explanatory drawing which shows the structure of the bearing unit modification 3 by this invention, (a) is schematic sectional drawing of a bearing unit, (b) is explanatory sectional drawing of the vehicle body side side surface of a hub flange, (c) is a hub flange. The expanded sectional view which shows the structure of an insert fitting part periphery. 従来の軸受ユニットの構成を示す説明断面図であり、（ａ）は軸受ユニットの概略断面図、（ｂ）はハブフランジの車体側側面の説明図、（ｃ）はハブフランジのハブボルト孔の構成を示す拡大断面図。It is explanatory sectional drawing which shows the structure of the conventional bearing unit, (a) is a schematic sectional drawing of a bearing unit, (b) is explanatory drawing of the vehicle body side surface of a hub flange, (c) is a structure of the hub bolt hole of a hub flange. FIG. 従来の軸受ユニットの構成を示す説明断面図。An explanatory sectional view showing the composition of a conventional bearing unit.

符号の説明Explanation of symbols

１ 軸受ユニット
２ 外輪
３ 内輪
４，５ 複数の転動体
８ ハブフランジ
８２ 円筒部材（インサート）の内径面（雌ネジ）
９ 円筒部材（インサート） DESCRIPTION OF SYMBOLS 1 Bearing unit 2 Outer ring 3 Inner ring 4, 5 Several rolling elements 8 Hub flange 82 Inner diameter surface (internal thread) of cylindrical member (insert)
9 Cylindrical member (insert)

Claims (6)

車体側に固定される静止輪と、
静止輪に対向して設けられ且つ車輪側に配された車輪側構成品が固定されて車輪と共に回転する回転輪と、
当該回転輪と静止輪のそれぞれの対向面に形成される軌道面間に転動自在に組み込まれた複数の転動体と、
回転輪から外方に向かって延出された円板状のハブフランジとを備え、ハブフランジには、周方向に沿って所定間隔で孔が、当該フランジの車輪側から車体側にわたって貫通して形成されており、当該孔に対してハブボルトを車輪側から挿入することで、車輪側構成品をハブフランジに固定する軸受ユニットにおいて、
孔には、前記ハブボルトが螺合可能な内径面を有する円筒部材が嵌合されているとともに、円筒部材は、ハブフランジの車体側の端面に加締め固定されており、前記車輪側構成品とハブボルトと円筒部材は、互いに同一の材質である軽合金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 fixed to the vehicle body side,
A rotating wheel that is provided facing the stationary wheel and that is disposed on the wheel side and that rotates together with the wheel.
A plurality of rolling elements incorporated in a freely rolling manner between the raceway surfaces formed on the opposing surfaces of the rotating wheel and the stationary wheel,
A disc-shaped hub flange extending outward from the rotating wheel, and the hub flange has holes extending from the wheel side to the vehicle body side at predetermined intervals along the circumferential direction. In the bearing unit for fixing the wheel side component to the hub flange by inserting the hub bolt from the wheel side into the hole,
A cylindrical member having an inner diameter surface into which the hub bolt can be screwed is fitted in the hole, and the cylindrical member is fixed by crimping to the end surface of the hub flange on the vehicle body side, and the wheel side component and The hub bolt and the cylindrical member are formed of a light alloy that is the same material as each other . 円筒部材の車輪側の端面が、フランジの車輪側の端面と同一平面上に位置付けられていることを特徴とする請求項１に記載の軸受ユニット。   2. The bearing unit according to claim 1, wherein an end surface on the wheel side of the cylindrical member is positioned on the same plane as an end surface on the wheel side of the flange. 円筒部材の車輪側の端面が、フランジの車輪側の端面から所定量だけ、車輪側に向けて突出していることを特徴とする請求項１に記載の軸受ユニット。   2. The bearing unit according to claim 1, wherein an end surface on the wheel side of the cylindrical member protrudes toward the wheel side by a predetermined amount from an end surface on the wheel side of the flange. 円筒部材の車輪側の端面は、フランジの車輪側の端面に沿って延在し、互いに連結していることを特徴とする請求項３に記載の軸受ユニット。 4. The bearing unit according to claim 3 , wherein end surfaces on the wheel side of the cylindrical member extend along the end surfaces on the wheel side of the flange and are connected to each other. 円筒部材の車輪側の端面には、車輪側構成品をハブフランジに固定する際の位置決めとして、車輪側に向けて延出した延出部が一体形成されていることを特徴とする請求項４に記載の軸受ユニット。   5. An extension part extending toward the wheel side is integrally formed on the end surface of the cylindrical member on the wheel side as positioning when the wheel side component is fixed to the hub flange. The bearing unit described in. ハブフランジの孔に嵌合する円筒部材の嵌合面には、絶縁防錆加工が施されていることを特徴とする請求項１乃至請求項５のいずれかに記載の軸受ユニット。
The bearing unit according to any one of claims 1 to 5 , wherein an insulating rust-proofing process is applied to a fitting surface of the cylindrical member fitted into the hole of the hub flange .
JP2007124832A 2007-05-09 2007-05-09 Bearing unit Active JP5200418B2 (en)

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