JP4602363B2 - Bearing device for driven wheel - Google Patents

Bearing device for driven wheel Download PDF

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JP4602363B2
JP4602363B2 JP2007019697A JP2007019697A JP4602363B2 JP 4602363 B2 JP4602363 B2 JP 4602363B2 JP 2007019697 A JP2007019697 A JP 2007019697A JP 2007019697 A JP2007019697 A JP 2007019697A JP 4602363 B2 JP4602363 B2 JP 4602363B2
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wheel
hub
bearing device
hub wheel
ring
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JP2007178001A (en
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圭一 杉野
信彦 辻
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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
    • F16C33/64—Special methods of manufacture
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut connections
    • 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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Support Of The Bearing (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、自動車等の車両の従動輪を車体に対して回転自在に支持する従動輪用軸受装置に関する。   The present invention relates to a bearing device for a driven wheel that rotatably supports a driven wheel of a vehicle such as an automobile.

自動車の車輪を回転自在に支持する車輪軸受装置は、ハブ輪を複列の軸受によって回転自在に支持した構造であり、ハブ輪が車輪に、軸受の固定側が車体の懸架装置にそれぞれ固定される。   A wheel bearing device that rotatably supports a wheel of an automobile has a structure in which a hub wheel is rotatably supported by a double-row bearing, and the hub wheel is fixed to the wheel and the fixed side of the bearing is fixed to the suspension device of the vehicle body. .

この車輪軸受装置は従動輪用と駆動輪用とに大別され、それぞれの要求機能に応えるべく、従動輪用と駆動輪用とで形状の異なるハブ輪が使用されている。図13は、従動輪用ハブ輪22’の従来例を示すもので、この種のハブ輪22’としては、一端外周部に車輪取付け用のフランジ部25’を有する中実構造のものが多く使用されている。
特開平９−２２０９０４号公報 This wheel bearing device is roughly classified into a driven wheel and a driving wheel, and hub wheels having different shapes are used for the driven wheel and the driving wheel in order to satisfy the respective required functions. FIG. 13 shows a conventional example of a hub wheel 22 ′ for a driven wheel. As this type of hub wheel 22 ′, there are many solid wheels having a flange portion 25 ′ for mounting a wheel on the outer periphery of one end. in use.
Japanese Patent Laid-Open No. 9-220904

しかしながら、図１３の従動輪用ハブ輪においては、アウトボード側の開口部を鍛造肌とする場合があり、そのままでは発錆、さらには美観の低下を生じる。また、このハブ輪においては、中実であるが故に軌道面等を研削する際に研削熱が蓄積されやすく、そのため研削熱の影響でワークが膨張し、研削完了後の寸法が狙い寸法に対して小さくなる。これは、加工誤差を生じる要因となる。また、形状によっては、ハブ輪中に蓄積された研削熱の温度分布に不均一を生じ、寸法・形状不良を招くおそれもある。 However, in the hub wheel for driven wheels of FIG. 13, the opening on the outboard side may be forged skin, which causes rusting and further aesthetic deterioration. In addition, since this hub wheel is solid, grinding heat tends to accumulate when grinding the raceway surface, etc., so the workpiece expands due to the influence of grinding heat, and the dimension after grinding is compared to the target dimension. Become smaller. This becomes a factor causing a processing error. In addition, depending on the shape, the temperature distribution of the grinding heat accumulated in the hub wheel may become non-uniform, which may lead to dimensional and shape defects.

これらの指摘に対しては、（１）切込み速度を遅くする、（２）研削液の流量又は圧力を増加させる、（３）複雑な切込み制御を行う、等の手段で対処しているが、何れの手段も、サイクルタイムの長期化、高コスト化等を招くため、決め手とはなっていない。   These indications are dealt with by means such as (1) slowing the cutting speed, (2) increasing the flow rate or pressure of the grinding fluid, (3) performing complex cutting control, etc. None of these means is decisive because it leads to longer cycle times and higher costs.

そこで、本発明は、ハブ輪のアウトボード側開口部での発錆を防止することを目的とする。また、研削熱の影響を回避して加工精度を高めると共に、サイクルタイムの短縮化、低コスト化等を図ることを目的とする。 Then, an object of this invention is to prevent the rusting in the outboard side opening part of a hub ring. Another object of the present invention is to increase the processing accuracy by avoiding the influence of grinding heat, and to shorten the cycle time and reduce the cost.

以上の目的を達成すべく、本発明は、内周に複列の軌道面を有する外方部材と、ハブ輪、ハブ輪の外周に圧入した内輪、および上記各軌道面に対向する複列の軌道面を有し、複列の軌道面のうちの一方がハブ輪の外周に、他方が内輪の外周に形成され、ハブ輪に従動輪の取付けフランジが設けられた内方部材と、外方部材の軌道面と内方部材の軌道面との間に介在する複列の転動体とを具備する従動輪用の軸受装置において、ハブ輪が、その両端に開口する貫通穴を備えた中空状に形成され、貫通穴のアウトボード側にテーパ状に拡開する鍛造肌の開口部を備え、開口部のアウトボード側の端部に旋削面からなる嵌合面が設けられ、外方部材の両端内周面と内方部材の外周面との間に配置したリング状のシール部材で軸受内部空間が密封され、ハブ輪の端部を加締めることにより、内輪の位置決めと予圧の付与とが行われ、さらに、ハブ輪のアウトボード側で前記開口部を密閉するカバーを具備し、カバーが、前記嵌合面よりもアウトボード側でハブ輪端面と密着する蓋状の底部と、底部からインボード側に突出し、前記嵌合面に嵌合され、前記底部よりも薄肉の嵌合部とを一体に有することを特徴とするものである。 In order to achieve the above object, the present invention provides an outer member having a double-row raceway surface on the inner periphery, a hub wheel, an inner ring press-fitted on the outer periphery of the hub wheel, and a double-row facing each of the raceway surfaces. An inner member having a raceway surface, wherein one of the double row raceway surfaces is formed on the outer periphery of the hub wheel and the other is formed on the outer periphery of the inner wheel, and the hub wheel is provided with a mounting flange of the driven wheel; In a bearing device for a driven wheel comprising a double row rolling element interposed between a raceway surface of a member and a raceway surface of an inner member, the hub wheel is hollow with a through hole opened at both ends thereof. Formed on the outboard side of the through hole with a forged skin opening, and a fitting surface consisting of a turning surface is provided at the end of the opening on the outboard side. The bearing internal space is sealed with a ring-shaped seal member arranged between the inner peripheral surface of both ends and the outer peripheral surface of the inner member. By crimping an end portion of the hub wheel, it is performed and the inner ring of the positioning and preload imparting, further comprising a cover enclosing the opening in the outboard side of the hub wheel, the cover, the mating face A lid-shaped bottom portion that is more closely in contact with the end face of the hub wheel on the outboard side, a protrusion that protrudes from the bottom portion to the inboard side, is fitted to the fitting surface, and has a thinner fitting portion than the bottom portion. It is characterized by.

このようにハブ輪のアウトボード側でハブ輪の開口部をカバーで密閉することにより、ハブ輪開口部の鍛造肌露出面の防錆、およびタイヤ側から見た美観の改善を図ることができる。また、内方部材を中空化すれば、内方部材の内周面に放熱面が形成されるため、自己放熱力が高まり、研削時等の過剰な蓄熱が抑えられる。また、中空部への研削液の供給が可能となるので、研削液による冷却効果の向上も期待できる。さらに製品が軽量化されるため、車両の軽量化に有効であり、同時に加工設備（例えば研削時のローディング装置）の動力削減も可能となる。 Thus, by sealing the opening of the hub wheel with the cover on the outboard side of the hub wheel, it is possible to prevent rust on the forged skin exposed surface of the hub wheel opening and to improve the aesthetics viewed from the tire side. . Further , if the inner member is hollowed out, a heat radiating surface is formed on the inner peripheral surface of the inner member, so that the self-radiating power is increased and excessive heat storage during grinding or the like is suppressed. In addition, since the grinding liquid can be supplied to the hollow portion, an improvement in the cooling effect by the grinding liquid can be expected. Further, since the product is reduced in weight, it is effective for reducing the weight of the vehicle, and at the same time, it is possible to reduce the power of processing equipment (for example, a loading device during grinding).

上記軸受装置の軸方向寸法をコンパクト化するため、内方部材を、中空のハブ輪とハブ輪の外周に圧入した内輪とで構成し、内方部材の複列の軌道面のうちの一方をハブ輪の外周に、他方を内輪の外周に形成することもできる。この場合、ハブ輪の外周には、内輪を圧入するための小径段部が設けられる。   In order to make the axial dimension of the bearing device compact, the inner member is composed of a hollow hub ring and an inner ring press-fitted into the outer periphery of the hub ring, and one of the double row raceway surfaces of the inner member is formed. It is also possible to form the other on the outer periphery of the hub ring and the other on the outer periphery of the inner ring. In this case, a small-diameter step portion for press-fitting the inner ring is provided on the outer periphery of the hub ring.

従動輪用軸受装置では、ハブ輪の端部にナットを締め込むことにより、内輪を軸方向で位置決めすると共に、軸受に予圧を付与する構造が一般的であるが、ハブ輪の端部を加締めて内輪を非分離に一体化することにより、同様の効果を得ることが可能となる。この場合、ナットが不要となるので、低コスト化や軸方向寸法のコンパクト化、および軽量化が達成される。   In a bearing device for a driven wheel, a structure is generally used in which the inner ring is positioned in the axial direction by tightening a nut at the end of the hub ring, and a preload is applied to the bearing, but the end of the hub ring is added. By tightening and integrating the inner ring in a non-separable manner, the same effect can be obtained. In this case, a nut is not required, so that cost reduction, axial dimension reduction, and weight reduction are achieved.

内方部材（あるいはハブ輪）の中空部は、両端を開口させた貫通穴とする他、一端を閉じた止まり穴とすることもできる。後者の場合、中空部の底を内輪側に配置すれば、ハブ輪のうちで内輪の内径側部分の剛性を高め、ラジアル負荷容量を増大させることができる。この内径側部分の剛性が低いと、ラジアル荷重により当該部分が弾性変形し、内輪とハブ輪のはめあい面に隙間を生じてこれがクリープの要因となる場合があるが、中空部の底を内輪側に配置することにより、当該内径側部分の剛性が向上するため、隙間の発生が防止され、クリープを回避できる。   The hollow part of the inward member (or hub wheel) can be a through hole with both ends opened, or a blind hole with one end closed. In the latter case, if the bottom of the hollow portion is disposed on the inner ring side, the rigidity of the inner ring side portion of the inner ring among the hub rings can be increased, and the radial load capacity can be increased. If the rigidity of the inner diameter side portion is low, the portion is elastically deformed by a radial load, creating a gap in the fitting surface between the inner ring and the hub ring, which may cause creep. Since the rigidity of the inner diameter side portion is improved, the generation of a gap is prevented and creep can be avoided.

中空部を内方部材（ハブ輪）の肉厚に応じた不等径とすることにより、放熱面積や蓄熱量を肉厚に応じて制御することが可能となり、内方部材全体の熱分布をバランスさせることが可能となる。不等径化した中空部としては、例えばインボード側が漸減するテーパ状のものや、段付き状のものが考えられる。   By making the hollow part an unequal diameter according to the thickness of the inner member (hub wheel), it is possible to control the heat radiation area and the amount of heat storage according to the thickness, and the heat distribution of the entire inner member can be controlled. It becomes possible to balance. As the unequal diameter hollow portion, for example, a tapered shape in which the inboard side gradually decreases or a stepped shape can be considered.

以上の軸受装置は、外方部材に設けられた車体取付け用フランジを介して車体側に取付けられる。例えば車体の懸架装置から延びる取付け部材（ナックル）を外方部材の外周に嵌合し、この取付け部材を車体取付けフランジに固定するのである。   The above bearing device is attached to the vehicle body side through a vehicle body attachment flange provided on the outer member. For example, an attachment member (knuckle) extending from the suspension device of the vehicle body is fitted to the outer periphery of the outer member, and this attachment member is fixed to the vehicle body attachment flange.

以上のように、本発明によれば、ハブ輪のアウトボード側でハブ輪の開口部をカバーで密閉しているので、ハブ輪開口部の鍛造肌露出面の防錆、およびタイヤ側から見た美観の改善を図ることができる。また、内方部材に中空部を設けているので、放熱面積の増大による自己放熱力の向上効果、および研削液による冷却効果が得られる。従って、研削等における加工誤差の抑制、およびサイクルタイムの短縮を図ることができる。また、軸受装置の使用中も中空部からの放熱がなされるので、内方部材への過剰な蓄熱を防止でき、軸受寿命を向上させることができる。さらに軸受装置全体が軽量化されるので、自動車の低燃費化や加工動力の削減を図ることができ、省エネルギー化に有効である。 As described above, according to the present invention, the opening of the hub wheel is sealed with the cover on the outboard side of the hub wheel, so that the forged skin exposed surface of the hub wheel opening is rust-proofed and viewed from the tire side. The aesthetics can be improved. Moreover, since the hollow part is provided in the inward member, the improvement effect of the self-radiation power by the increase in the heat radiation area and the cooling effect by the grinding liquid are obtained. Therefore, it is possible to suppress processing errors in grinding or the like and shorten the cycle time. Further, since heat is radiated from the hollow portion even during use of the bearing device, excessive heat storage in the inner member can be prevented, and the bearing life can be improved. Furthermore, since the entire bearing device is reduced in weight, it is possible to reduce the fuel consumption of the automobile and reduce the processing power, which is effective for energy saving.

中空部を内方部材の肉厚に応じた不等径とすることにより、放熱面積や蓄熱量を肉厚に応じて制御することが可能となり、内方部材全体の熱分布をバランスさせることが可能となる。   By making the hollow part an unequal diameter according to the thickness of the inner member, it becomes possible to control the heat radiation area and the amount of heat storage according to the thickness, and to balance the heat distribution of the entire inner member. It becomes possible.

以下、本発明に係る従動輪軸受装置の実施形態を図１乃至図12に基づいて説明する。なお、以下の説明においては、車両に組付けた状態で車両の外側寄りとなる側をアウトボード側といい、上記各図の左側がアウトボード側となる。一方、車両の中央寄りとなる側をインボード側といい、各図の右側がインボード側となる。   Embodiments of a driven wheel bearing device according to the present invention will be described below with reference to FIGS. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side, and the left side in each of the above figures is the outboard side. On the other hand, the side closer to the center of the vehicle is called the inboard side, and the right side of each figure is the inboard side.

図１に示す実施形態の軸受装置は、円筒状の外方部材10、外方部材の内径部に配置した内方部材20、外方部材10と内方部材20との間に介在させた複数の転動体30（例えばボール）、転動体３0 を円周方向で等間隔に保持する保持器４0 （図11参照）を主要な構成要素としている。   The bearing device according to the embodiment shown in FIG. 1 includes a cylindrical outer member 10, an inner member 20 disposed on an inner diameter portion of the outer member, and a plurality of members interposed between the outer member 10 and the inner member 20. The rolling elements 30 (for example, balls) and the cage 40 (see FIG. 11) for holding the rolling elements 30 at equal intervals in the circumferential direction are the main components.

外方部材10は、内周に複列の軌道面11を備え、外周に車体側の取付け部材、例えば懸架装置から延びるナックルに取付けるための車体取付け用フランジ12を一体に備える。外方部材10の両端開口部のうち、アウトボード側にはリング状のシール部材13が、インボード側には円板状のハブキャップ14がそれぞれ装着され、両者によって軸受の内部空間が密封されている。インボード側の密封装置として、ハブキャップ14の代わりにリング状のシール部材14（図11参照）を使用することもできる。   The outer member 10 includes a double-row raceway surface 11 on the inner periphery, and integrally includes a vehicle body attachment flange 12 for attachment to a vehicle body side attachment member, for example, a knuckle extending from a suspension device. Of the openings at both ends of the outer member 10, a ring-shaped seal member 13 is mounted on the outboard side, and a disk-shaped hub cap 14 is mounted on the inboard side, thereby sealing the internal space of the bearing. ing. As a sealing device on the inboard side, a ring-shaped sealing member 14 (see FIG. 11) can be used instead of the hub cap 14.

内方部材20は、ハブ輪22とハブ輪の外周に固定したリング状の内輪23とで構成される。ハブ輪22外周の軸方向ほぼ中央部に軌道面24が形成され、軌道面24よりもアウトボード側の外周に図示しない従動輪を取付けるための取付けフランジ25が一体形成されている。この取付けフランジ25の円周方向等間隔位置にはハブボルト50が植え込まれ、このハブボルト50によって、ハブ輪22が図示しないブレーキロータと共に従動輪に固定される。軌道面24よりもインボード側のハブ輪22外周には、軌道面24よりも小径でかつ円筒状の小径段部26が形成され、この小径段部26に上記内輪23が圧入される。内輪23はその外周に軌道面27を有し、この軌道面27と、ハブ輪22の外周に形成された軌道面24とで、外方部材10の複列軌道面11にそれぞれ対向する複列軌道面が形成される。   The inner member 20 includes a hub wheel 22 and a ring-shaped inner ring 23 fixed to the outer periphery of the hub wheel. A raceway surface 24 is formed at substantially the center in the axial direction of the outer periphery of the hub wheel 22, and a mounting flange 25 for attaching a driven wheel (not shown) to the outer periphery on the outboard side of the raceway surface 24 is integrally formed. Hub bolts 50 are implanted in the circumferentially equidistant positions of the mounting flange 25, and the hub wheel 22 is fixed to the driven wheel together with a brake rotor (not shown) by the hub bolt 50. On the outer periphery of the hub wheel 22 on the inboard side with respect to the raceway surface 24, a small diameter step portion 26 having a smaller diameter than the raceway surface 24 and a cylindrical shape is formed, and the inner ring 23 is press-fitted into the small diameter step portion 26. The inner ring 23 has a raceway surface 27 on the outer periphery thereof, and the raceway surface 27 and the raceway surface 24 formed on the outer periphery of the hub ring 22 are respectively opposed to the double row raceway surface 11 of the outer member 10. A raceway surface is formed.

内方部材20のインボード側端部にはねじ部28が形成される。このねじ部28に加圧手段60としてのナット61を螺合させてこれを締め込むと、内輪23が小径段部26の肩部29との間に挾持され、内輪23が軸方向で位置決めされると共に、転動体30に所定の予圧が付与される。複列の転動体30はそれぞれ接触角を有しており、前述の予圧によって軸受剛性を高め、かつモーメント荷重を受けられるようになっている。   A threaded portion 28 is formed at the end of the inner member 20 on the inboard side. When a nut 61 as a pressurizing means 60 is screwed into this screw portion 28 and tightened, the inner ring 23 is clamped between the shoulder portion 29 of the small diameter step portion 26, and the inner ring 23 is positioned in the axial direction. In addition, a predetermined preload is applied to the rolling elements 30. Each of the double row rolling elements 30 has a contact angle, and the above-described preload increases the bearing rigidity and can receive a moment load.

図示の通り、ハブ輪22は、その軸芯部に両端を開口した貫通穴状の中空部21を軸方向に沿って有する。この中空部21を形成することにより、ハブ輪22の内周面に放熱面が形成されるため、自己放熱力が高まると共に、中空部21への研削液の供給が可能となり、研削液による冷却効果が高まる。従って、両者の相乗効果により、加工精度の向上、およびサイクルタイムの短縮が可能となる。また、軸受装置の使用中にもハブ輪22の放熱効果が発揮されるため、軸受寿命の向上が達成される。さらに、中空部21の存在によって軸受装置全体が軽量化されるため、車両の軽量化による低燃費化を図ることができ、同時にハブ輪22の研削工程で使用するローディング装置などの加工設備の簡略化、コンパクト化、あるいは加工動力の低減（省エネルギー化）が達成される。   As shown in the figure, the hub wheel 22 has a through hole-shaped hollow portion 21 having both ends opened in the axial center thereof along the axial direction. By forming the hollow portion 21, a heat radiating surface is formed on the inner peripheral surface of the hub wheel 22, so that the self-heat radiation power is increased and the grinding fluid can be supplied to the hollow portion 21, and cooling by the grinding fluid is performed. Increases effectiveness. Therefore, due to the synergistic effect of both, it is possible to improve the machining accuracy and shorten the cycle time. Further, since the heat dissipation effect of the hub wheel 22 is exhibited even during use of the bearing device, the bearing life is improved. Furthermore, since the entire bearing device is reduced in weight by the presence of the hollow portion 21, fuel consumption can be reduced by reducing the weight of the vehicle, and at the same time, processing equipment such as a loading device used in the grinding process of the hub wheel 22 is simplified. , Compactness, or reduction of processing power (energy saving) is achieved.

図２〜図６は、ハブ輪22に設けられた中空部21の他の実施形態を示すもので、以下に述べる点を除いて、図１に示す軸受装置の中空部と同様の構成、機能を有する。   2 to 6 show other embodiments of the hollow portion 21 provided in the hub wheel 22. Except for the points described below, the configuration and function are the same as those of the hollow portion of the bearing device shown in FIG. Have

図２および図３は、中空部21の両端を開口させるのが難しい場合の対策例で、中空部21を、一方の開口部を閉じた止まり穴とした実施形態である。何れの場合も、少なくとも車輪取付けフランジ25よりもインボード側に中空部21が存在している。図２は内輪23側（インボード側）、図３はその反対側（アウトボード側）をそれぞれ閉じ側としたもので、特に前者の場合は、ハブ輪22のうちで内輪23の内径側部分の剛性が高まるため、ラジアル負荷容量を増大させたり、あるいは、内輪23およびハブ輪22のハメアイ面でのクリープを抑制することが可能となる。なお、何れの場合も、閉じ側のハブ輪22端部にはセンタ孔71を形成することができる。   FIG. 2 and FIG. 3 are examples of measures when it is difficult to open both ends of the hollow portion 21, and is an embodiment in which the hollow portion 21 is a blind hole with one opening closed. In any case, the hollow portion 21 exists at least on the inboard side of the wheel mounting flange 25. 2 shows the inner ring 23 side (inboard side), and FIG. 3 shows the opposite side (outboard side) as the closed side. In the former case, the inner ring 23 portion of the inner ring 23 in the hub ring 22 is shown. Therefore, it is possible to increase the radial load capacity or to suppress the creeping of the inner ring 23 and the hub ring 22 on the saddle eye surface. In either case, a center hole 71 can be formed at the end of the hub wheel 22 on the closed side.

図４〜図６は、中空部21の内径をハブ輪22の外周形状に応じて不等径にすることにより、研削熱のバラツキを抑制して温度分布の均一化を図った例である。図４は、中空部21の内周をハブ輪22の外周形状に略対応する段付き状に形成したもの、図５は、インボード側中空部21の内周をテーパ状としたものである。また、図６は、図４と図５を複合させた形態で、中空部21の内径を一または複数（図示例では２つ）のテーパ部21ａ、21ｂを介して段付き状に縮小させた例である。何れの実施形態においても、ハブ輪22の外周が概ねインボード側ほど縮径していることに対応して、中空部21の内径もインボード側が縮小している。   FIGS. 4 to 6 are examples in which the inner diameter of the hollow portion 21 is made unequal in accordance with the outer peripheral shape of the hub wheel 22, thereby suppressing the variation in grinding heat and making the temperature distribution uniform. 4 shows the inner periphery of the hollow portion 21 formed in a stepped shape substantially corresponding to the outer peripheral shape of the hub wheel 22, and FIG. 5 shows the inner periphery of the inboard side hollow portion 21 tapered. . FIG. 6 is a combination of FIGS. 4 and 5, and the inner diameter of the hollow portion 21 is reduced to a stepped shape via one or a plurality (two in the illustrated example) of tapered portions 21 a and 21 b. It is an example. In any embodiment, the inner diameter of the hollow portion 21 is also reduced on the inboard side, corresponding to the fact that the outer circumference of the hub wheel 22 is generally reduced in diameter toward the inboard side.

図７〜図10は、本発明にかかるハブ輪22の研削工程を示すものである。このうち、図７および図８は、シュー81によりハブ輪22外周を支持する例で（この場合、ハブ輪22のアウトボード側端面の開口部22ａはパッキングプレート82で封止するのが望ましい）、図７は貫通穴状の中空部21を有するハブ輪22（図１参照）、図８は止まり穴状の中空部21を有するハブ輪22（図３参照）の研削工程をそれぞれ示す。図７の貫通穴状中空部21では、研削液は研削装置の主軸側（図面左側）、あるいはその反対側の何れからも供給され得るが、図８の止まり穴状中空部21では、研削液はその開口側からのみ供給される。図９および図10は、図７および図８と同様のハブ輪22を主軸に取付けたコレットチャック83で支持する例で、研削液の供給方法は図７および図８の場合と同様である。   7 to 10 show a grinding process of the hub wheel 22 according to the present invention. 7 and 8 show an example in which the outer periphery of the hub wheel 22 is supported by the shoe 81 (in this case, the opening 22a on the end surface on the outboard side of the hub wheel 22 is preferably sealed with the packing plate 82). FIG. 7 shows a grinding process for the hub wheel 22 (see FIG. 1) having a hollow portion 21 having a through hole, and FIG. 8 shows a grinding process for the hub wheel 22 having a hollow portion 21 having a blind hole (see FIG. 3). In the through-hole-shaped hollow portion 21 in FIG. 7, the grinding fluid can be supplied from either the main spindle side (left side of the drawing) or the opposite side of the grinding apparatus. Is supplied only from the opening side. FIGS. 9 and 10 show examples in which the same hub wheel 22 as in FIGS. 7 and 8 is supported by a collet chuck 83 attached to the main shaft, and the method of supplying the grinding fluid is the same as in FIGS.

図11は、加圧手段60としてのナット61を廃止し、代わりに中空部21を有するハブ輪22の端部（インボード側）を加締めて内輪23を非分離に一体化することにより、さらなる低コスト化および軸方向寸法のコンパクト化を図った例である。図示例の場合、加締めは、ハブ輪22の一端部に円筒状等の被かしめ部を形成し、これを外径側に押し広げることによって行われる。この場合、ナット61と同様に、かしめ部分62が内輪23を位置決めすると共に、複列の転動体30に予圧を与える役割を果たす。   FIG. 11 eliminates the nut 61 as the pressurizing means 60, and instead of caulking the end portion (inboard side) of the hub wheel 22 having the hollow portion 21, and integrating the inner ring 23 in a non-separable manner, This is an example of further cost reduction and axial dimension reduction. In the case of the illustrated example, the caulking is performed by forming a caulking portion such as a cylindrical shape at one end portion of the hub wheel 22 and expanding it to the outer diameter side. In this case, like the nut 61, the caulking portion 62 serves to position the inner ring 23 and to apply preload to the double row rolling elements 30.

図１１および図１２は、ハブ輪２２のアウトボード側端部をカバー９０で密閉した構造を示す。これは、貫通穴２１のアウトボード側で拡開するテーパ状の開口部２２ａの鍛造肌露出面の防錆、およびタイヤ側から見た美観の改善を目的としたもので、このカバー９０により、従来行われていた開口部２２ａの塗装工程が省略可能となり、さらなる低コスト化を図ることができる。カバー９０は、樹脂・ゴム製（図１１参照）、あるいは金属製（図１２参照）とすることができ、例えばハブ輪２２の開口部２２ａに旋削加工等で形成した嵌合面２２ｂに圧入することによってハブ輪２２に固定される。カバー９０は、嵌合面２２ｂよりもアウトボード側でハブ輪端面２２ｃと密着する蓋状の底部９０ａと、底部９０ａからインボード側に突出し、嵌合面２２ｂに嵌合される嵌合部９０ｂとを一体に有する。図１１に示すカバー９０では、嵌合部９０ｂは底部９０ａよりも薄肉に形成されている。 11 and 12 show a structure in which the end portion on the outboard side of the hub wheel 22 is sealed with a cover 90. FIG. This is for the purpose of rust prevention of the exposed surface of the forged skin of the tapered opening 22a that expands on the outboard side of the through hole 21 and the improvement of aesthetics viewed from the tire side. The painting process of the opening part 22a performed conventionally can be omitted, and further cost reduction can be achieved. The cover 90 can be made of resin / rubber (see FIG. 11) or metal (see FIG. 12). For example, the cover 90 is press-fitted into the fitting surface 22b formed in the opening 22a of the hub wheel 22 by turning or the like. Thus, the hub wheel 22 is fixed. The cover 90 has a lid-like bottom portion 90a that is in close contact with the hub wheel end surface 22c on the outboard side from the fitting surface 22b, and a fitting portion 90b that protrudes from the bottom portion 90a to the inboard side and is fitted to the fitting surface 22b. And integrally. In the cover 90 shown in FIG. 11, the fitting part 90b is formed thinner than the bottom part 90a.

本発明にかかる従動輪用軸受装置の断面図である。It is sectional drawing of the bearing apparatus for driven wheels concerning this invention. 中空部の他の実施形態を示すハブ輪の断面図である。It is sectional drawing of the hub ring which shows other embodiment of a hollow part. 中空部の他の実施形態を示すハブ輪の断面図である。It is sectional drawing of the hub ring which shows other embodiment of a hollow part. 中空部の他の実施形態を示すハブ輪の断面図である。It is sectional drawing of the hub ring which shows other embodiment of a hollow part. 中空部の他の実施形態を示すハブ輪の断面図である。It is sectional drawing of the hub ring which shows other embodiment of a hollow part. 中空部の他の実施形態を示すハブ輪の断面図である。It is sectional drawing of the hub ring which shows other embodiment of a hollow part. ハブ輪の研削工程例を示す断面図である。It is sectional drawing which shows the example of a grinding process of a hub ring. ハブ輪の研削工程例を示す断面図である。It is sectional drawing which shows the example of a grinding process of a hub ring. ハブ輪の研削工程例を示す断面図である。It is sectional drawing which shows the example of a grinding process of a hub ring. ハブ輪の研削工程例を示す断面図である。It is sectional drawing which shows the example of a grinding process of a hub ring. 従動輪用軸受装置の他の実施形態を示す断面図である。It is sectional drawing which shows other embodiment of the bearing apparatus for driven wheels. カバーの他例を示す断面図である。It is sectional drawing which shows the other example of a cover. 従来のハブ輪の断面図である。It is sectional drawing of the conventional hub ring.

符号の説明Explanation of symbols

10 外方部材
11 軌道面
12 車体取付けフランジ
20 内方部材
21 中空部
22 ハブ輪
23 内輪
24 軌道面
25 車輪取付けフランジ
27 軌道面
62 かしめ部分 10 Outer member
11 Track surface
12 Body mounting flange
20 Inner member
21 Hollow part
22 Hub wheel
23 Inner ring
24 Track surface
25 Wheel mounting flange
27 Track surface
62 Caulking part

Claims (7)

内周に複列の軌道面を有する外方部材と、ハブ輪、ハブ輪の外周に圧入した内輪、および上記各軌道面に対向する複列の軌道面を有し、複列の軌道面のうちの一方がハブ輪の外周に、他方が内輪の外周に形成され、ハブ輪に従動輪の取付けフランジが設けられた内方部材と、外方部材の軌道面と内方部材の軌道面との間に介在する複列の転動体とを具備する従動輪用の軸受装置において、
ハブ輪が、その両端に開口する貫通穴を備えた中空状に形成され、貫通穴のアウトボード側にテーパ状に拡開する鍛造肌の開口部を備え、開口部のアウトボード側の端部に旋削面からなる嵌合面が設けられ、
外方部材の両端内周面と内方部材の外周面との間に配置したリング状のシール部材で軸受内部空間が密封され、ハブ輪の端部を加締めることにより、内輪の位置決めと予圧の付与とが行われ、
さらに、ハブ輪のアウトボード側で前記開口部を密閉するカバーを具備し、カバーが、前記嵌合面よりもアウトボード側でハブ輪端面と密着する蓋状の底部と、底部からインボード側に突出し、前記嵌合面に嵌合され、前記底部よりも薄肉の嵌合部とを一体に有することを特徴とする従動輪用軸受装置。 An outer member having a double-row raceway surface on the inner periphery, a hub wheel, an inner ring press-fitted into the outer periphery of the hub wheel, and a double-row raceway surface facing each of the raceway surfaces. One of them is formed on the outer periphery of the hub ring, the other is formed on the outer periphery of the inner ring, the inner member provided with the mounting flange of the driven wheel of the hub wheel, the raceway surface of the outer member and the raceway surface of the inner member In a bearing device for a driven wheel comprising a double row rolling element interposed between
The hub wheel is formed in a hollow shape with through holes opening at both ends thereof , and has an opening portion of forging skin that expands in a tapered shape on the outboard side of the through hole, and the end portion on the outboard side of the opening portion Is provided with a mating surface consisting of a turning surface,
Positioning and preloading of the inner ring is achieved by sealing the inner space of the bearing with a ring-shaped seal member disposed between the inner peripheral surface of both ends of the outer member and the outer peripheral surface of the inner member, and crimping the end of the hub ring. Is granted,
Furthermore, a cover for sealing the opening on the outboard side of the hub wheel is provided, and the cover has a lid-like bottom portion that is in close contact with the end surface of the hub wheel on the outboard side with respect to the fitting surface, and the inboard side from the bottom portion The driven wheel bearing device is characterized in that it integrally has a fitting portion that protrudes into the fitting surface and is fitted to the fitting surface and is thinner than the bottom portion . 貫通穴を、内方部材の肉厚に応じた不等径とした請求項１記載の従動輪用軸受装置。 A through hole, the driven wheel bearing apparatus of claim 1, wherein the unequal diameter corresponding to the thickness of the inner member. インボード側の内径が漸減するテーパ状の貫通穴を有する請求項２記載の従動輪用軸受装置。 The bearing device for a driven wheel according to claim 2, further comprising a tapered through hole whose inner diameter on the inboard side gradually decreases. 段付き状の貫通穴を有する請求項２記載の従動輪用軸受装置。 The bearing device for a driven wheel according to claim 2, comprising a stepped through hole. 外方部材に車体取付けフランジを形成した請求項１〜４何れか記載の従動輪用軸受装置。 The bearing device for a driven wheel according to any one of claims 1 to 4 , wherein a vehicle body mounting flange is formed on the outer member. シール部材をハブ輪の外周面に接触させた請求項１記載の従動輪用軸受装置。   The driven-wheel bearing device according to claim 1, wherein the seal member is brought into contact with the outer peripheral surface of the hub wheel. シール部材を内輪の外周面に接触させた請求項１記載の従動輪用軸受装置。   The driven-wheel bearing device according to claim 1, wherein the seal member is brought into contact with the outer peripheral surface of the inner ring.
JP2007019697A 2007-01-30 2007-01-30 Bearing device for driven wheel Expired - Fee Related JP4602363B2 (en)

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JPH041721U (en) * 1990-04-20 1992-01-08
JPH09220904A (en) * 1995-12-15 1997-08-26 Nippon Seiko Kk Hub unit for wheel support
JPH10264605A (en) * 1997-03-25 1998-10-06 Skf Ind Spa Method and device for firmly connecting vehicle driving wheel hub to constant velocity universal joint
JP2000198304A (en) * 1998-10-29 2000-07-18 Nsk Ltd Rolling bearing unit for wheel

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