JP5252838B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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Publication number
JP5252838B2
JP5252838B2 JP2007147728A JP2007147728A JP5252838B2 JP 5252838 B2 JP5252838 B2 JP 5252838B2 JP 2007147728 A JP2007147728 A JP 2007147728A JP 2007147728 A JP2007147728 A JP 2007147728A JP 5252838 B2 JP5252838 B2 JP 5252838B2
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wheel
bolt
forging
hub
mounting flange
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JP2008296852A (en
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功 平井
孝康 田窪
清武 柴田
昭吾 鈴木
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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
    • 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
    • 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

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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、自動車等の車輪を支持する車輪用軸受装置に関するもので、特に、マテリアルロスを削減して低コスト化と軽量化を図ると共に、車輪取付フランジに圧入固定されるハブボルトの座面の精度を確保してハブボルトの強度・耐久性を向上させた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. In particular, the material loss is reduced to reduce cost and weight, and the seat surface of a hub bolt that is press-fitted and fixed to a wheel mounting flange. The present invention relates to a wheel bearing device that ensures accuracy and improves the strength and durability of hub bolts.

近年、部品を加工する際に、その途中の加工工程で切削加工等で除去される重量（マテリアルロス）を減らすことにより、投入される材料重量を使い切ってコスト削減を図ることがなされている。一方、このマテリアルロスを減らすと共に、鍛造精度を向上させて後工程の切削工程や角部に発生するバリ取り工程を廃止し、加工工数を削減してコスト削減を図るために密閉鍛造を用いることが多くなってきている。   In recent years, when a part is processed, the weight (material loss) removed by a cutting process or the like in the intermediate processing step is reduced, thereby reducing the cost by using up the weight of the material to be input. On the other hand, to reduce this material loss, improve forging accuracy, eliminate the subsequent cutting process and deburring process that occurs in the corners, and use closed forging to reduce processing man-hours and reduce costs There are many more.

自動車等の車輪を支持する車輪用軸受装置においては、低コスト化は言うに及ばず、燃費向上のために軽量化を追求することにより、余肉を排除して車輪用軸受装置をスリム化させることと、操縦安定性のために車輪用軸受装置を剛性アップさせることがなされている。こうした、言わば両者相反する要求を満足しつつ、各部品の強度・耐久性を向上させるための対策が種々講じられている。   In wheel bearing devices that support wheels of automobiles, etc., not to mention cost reduction, but pursuing weight reduction to improve fuel efficiency, eliminate the surplus and make the wheel bearing devices slim. In addition, the rigidity of the wheel bearing device has been increased for handling stability. Various measures have been taken to improve the strength and durability of each component while satisfying these mutually contradictory requirements.

一般的に、自動車等の車輪を支持する車輪用軸受装置では、回転輪側のハブ軸または外輪の外周部にフランジが形成され、このフランジの円周数箇所に貫通孔が設けられ、この貫通孔に車輪およびブレーキのディスクロータを固定するためのボルトが圧入固定されている。これらハブ軸または外輪は、鍛造加工により整形された後、フランジにおいてディスクロータが当接される面に対して切削加工を施すことにより製作される。   Generally, in a wheel bearing device for supporting a wheel of an automobile or the like, a flange is formed on the outer peripheral portion of the hub shaft or outer ring on the rotating wheel side, and through holes are provided at circumferential positions of the flange. Bolts for fixing the wheel and brake disc rotors are press-fitted and fixed in the holes. These hub shafts or outer rings are manufactured by shaping the surface of the flange against which the disk rotor comes into contact with after being shaped by forging.

ここで、ボルトの中心軸がハブ輪の中心軸に対して傾斜していると、車輪やディスクロータをハブ輪のフランジに円滑に取り付けることができなくなるため、図６に示すような車輪用軸受装置が提案されている。この車輪用軸受装置は、ハブ軸５０の一方軸端寄りに径方向外方に延びるフランジ５１が一体に形成されており、このフランジ５１の円周数箇所に貫通孔５２が設けられている。そして、この貫通孔５２に対しボルト５３が軸方向ならびに周方向に引っ掛かりを持つ状態でかつ突出する状態で挿入されている。   Here, if the central axis of the bolt is inclined with respect to the central axis of the hub wheel, the wheel and the disc rotor cannot be smoothly attached to the flange of the hub wheel. A device has been proposed. In this wheel bearing device, a flange 51 extending radially outward is integrally formed near one end of the hub shaft 50, and through holes 52 are provided at circumferential positions of the flange 51. A bolt 53 is inserted into the through hole 52 in a state of being hooked in the axial direction and the circumferential direction and protruding.

ハブ軸５０は、ＪＩＳ規格Ｓ５５Ｃ等を母材として鍛造加工により整形された後、フランジ５１のディスクロータ（図示せず）が当接する外側面５４に対して切削加工を施すことにより製作される。鍛造加工によりハブ軸５０のフランジ５１が形成される時、このフランジ５１のボルト座面５５において、ハブ軸５０の中心軸Ｏに直交する平面Ｓに対する傾斜角αが、鍛造加工の精度管理のみにより０．４８度以下に設定されている。   The hub shaft 50 is manufactured by shaping the outer surface 54 with which a disk rotor (not shown) of the flange 51 contacts after being shaped by forging using JIS standard S55C as a base material. When the flange 51 of the hub shaft 50 is formed by forging, the inclination angle α of the bolt seat surface 55 of the flange 51 with respect to the plane S perpendicular to the central axis O of the hub shaft 50 is only controlled by forging accuracy control. It is set to 0.48 degrees or less.

このようにしていれば、フランジ５１の貫通孔５２に対してボルト５３を取り付けた時に、ボルト５３の頭部５３ａをフランジ５１のボルト座面５５に密に接触させるだけで、ボルト５３の姿勢、すなわち、ハブ軸５０の中心軸Ｏに対するボルト５３の中心軸Ｏ’の平行度を適正にすることができ、車輪（図示せず）およびディスクロータを円滑に取り付けることができる。
特開２００３−３４１３０２号公報 In this way, when the bolt 53 is attached to the through hole 52 of the flange 51, the head 53a of the bolt 53 is brought into close contact with the bolt seat surface 55 of the flange 51, and the posture of the bolt 53, That is, the parallelism of the central axis O ′ of the bolt 53 with respect to the central axis O of the hub shaft 50 can be made appropriate, and the wheel (not shown) and the disc rotor can be attached smoothly.
JP-A-2003-341302

然しながら、前述した従来の車輪用軸受装置において、フランジ５１のボルト座面５５の精度を確認するためには測定する必要があり、また、熱間鍛造後に品質確認を行うためには鍛造加工後の製品が冷えてからでないと測定できない。さらに、全数確認するとなると管理工数が嵩みコスト高騰を招来する。   However, in the conventional wheel bearing device described above, it is necessary to perform measurement in order to confirm the accuracy of the bolt seat surface 55 of the flange 51, and in order to confirm the quality after hot forging, after the forging process is performed. It can only be measured after the product has cooled. Furthermore, if the total number is confirmed, the man-hours for management increase and the cost increases.

また、こうしたハブ軸５０を密閉鍛造した場合、材料が鍛造型の中で充足しているか否かを確認する必要がある。材料が充足していない場合、このボルト座面５５に欠肉が発生し、所望の精度が得られないと共に、充足しているのにさらに加圧しようとすると、鍛造金型や鍛造装置の破損に繋がる。例えば、充足するポイントを探すには、鍛造装置を調整しながら試し打ちした製品を品質確認する作業を繰り返すしかない。これでは、試し打ちの個数が廃棄個数になりさらに製品コストが高騰する。   Further, when such a hub shaft 50 is hermetically forged, it is necessary to confirm whether or not the material is satisfied in the forging die. When the material is not satisfied, the bolt seat surface 55 is thinned, and the desired accuracy cannot be obtained. If the material is satisfied but further pressurization is attempted, the forging die or the forging device is damaged. It leads to. For example, in order to find a point to be satisfied, there is no choice but to repeat the work of checking the quality of the trial product while adjusting the forging device. In this case, the number of trial hits becomes the number of discarded items, which further increases the product cost.

また、鍛造工程や組立工程あるいは運搬作業中では、特に、図７（ａ）に示すように、鍛造工程において、ハブ軸５０の鍛造完了品５６同士がぶつかる等して干渉した場合に打痕が付く。ここで、硬化処理が施されていないフランジ５１の外径部が干渉すると、（ｂ）に示すように、その打痕のカエリ５７によって、ボルト座面５５の面精度が悪化してボルト５３がボルト座面５５に密着せず、使用中の摩耗等で軸力が低下してナット外れやボルト５３が折損する恐れがある。   Further, during the forging process, the assembling process or the carrying work, as shown in FIG. 7A, in particular, in the forging process, when the forged products 56 of the hub axle 50 collide with each other and collide with each other, a dent is formed. Stick. Here, when the outer diameter portion of the flange 51 not subjected to the hardening treatment interferes, as shown in (b), the surface accuracy of the bolt seat surface 55 deteriorates due to the dents 57 of the dents, and the bolt 53 is removed. The bolt seat surface 55 may not be in close contact, and the axial force may decrease due to wear or the like during use, and the nut may be removed or the bolt 53 may be broken.

本発明は、このような事情に鑑みてなされたもので、マテリアルロスを削減して低コスト化と軽量化を図ると共に、車輪取付フランジに圧入固定されるハブボルトの座面の精度を確保してハブボルトの強度・耐久性を向上させた車輪用軸受装置を提供することを目的としている。   The present invention has been made in view of such circumstances, reducing material loss to reduce cost and weight, and ensuring the accuracy of the seat surface of the hub bolt that is press-fitted to the wheel mounting flange. An object of the present invention is to provide a wheel bearing device in which the strength and durability of a hub bolt are improved.

係る目的を達成すべく、本発明のうち請求項１に記載の発明は、内周に複列の外側転走面が一体に形成された外方部材と、この外方部材に内嵌され、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記外方部材または内方部材のうち回転側となる部材に車輪を取り付けるための車輪取付フランジが一体に形成され、この車輪取付フランジの周方向等配に形成された貫通孔に前記車輪を締結するハブボルトが圧入固定された車輪用軸受装置において、前記車輪取付フランジのインナー側の側面に前記ハブボルトが圧入される部位が厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブに前記ハブボルトの頭部が密着するフラットなボルト座面が形成されると共に、当該車輪取付フランジの外縁部のインナー側に鍛造加工によって前記ボルト座面に干渉しないように繭形状の凸部が形成され、この凸部が鍛造時の金型内の材料充足の判別用である。
In order to achieve the object, the invention described in claim 1 of the present invention is an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and is fitted into the outer member. An inner member having a double row inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and accommodated in a freely rollable manner between both rolling surfaces of the inner member and the outer member. A wheel mounting flange for mounting a wheel on the rotating member of the outer member or the inner member is integrally formed, and the circumferential direction of the wheel mounting flange is equally distributed. In a wheel bearing device in which a hub bolt for fastening the wheel is press-fitted and fixed in a through hole formed in a petal-like shape in which a portion into which the hub bolt is press-fitted into an inner side surface of the wheel mounting flange is a thick portion. ribs are formed by forging, the this rib hub bolt With flat bolt bearing surface which the head comes into close contact is formed, the convex portion of the cocoon shape so as not to interfere with the bolt bearing surface by forging to the inner side of the outer edge of the wheel mounting flange is formed, the convex The part is for determining material satisfaction in the mold during forging .

このように回転側の部材に車輪取付フランジが一体に形成され、この車輪取付フランジの周方向等配に形成された貫通孔に車輪を締結するハブボルトが圧入固定された車輪用軸受装置において、車輪取付フランジのインナー側の側面にハブボルトが圧入される部位が厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブにハブボルトの頭部が密着するフラットなボルト座面が形成されると共に、当該車輪取付フランジの外縁部のインナー側に鍛造加工によってボルト座面に干渉しないように繭形状の凸部が形成され、この凸部が鍛造時の金型内の材料充足の判別用であるので、ハブボルトの座面の精度を確保してハブボルトの強度・耐久性を向上させた車輪用軸受装置を提供することができる。
Thus, in the wheel bearing device in which the wheel mounting flange is integrally formed on the rotation side member, and the hub bolt that press-fits and fixes the wheel to the through-hole formed in the circumferential direction of the wheel mounting flange is press-fitted. A petal-like rib is formed by forging at the portion where the hub bolt is press-fitted into the side surface on the inner side of the mounting flange, and a flat bolt seating surface is formed on which the head of the hub bolt closely contacts. In addition, a hook-shaped convex portion is formed on the inner side of the outer edge portion of the wheel mounting flange so as not to interfere with the bolt seat surface by forging , and this convex portion is used for determining material satisfaction in the mold during forging. there so, it is possible to provide a wheel bearing apparatus with improved strength and durability of the hub bolts to ensure the accuracy of the bearing surface of the hub bolt.

好ましくは、請求項２に記載の発明のように、前記回転側の部材が熱間の密閉鍛造により形成され、前記ボルト座面が鍛造加工により所定の面精度に形成されていれば、加工工数を削減すると共に、マテリアルロスを削減して低コスト化を図ることができる。   Preferably, as in the invention described in claim 2, if the rotating side member is formed by hot hermetic forging and the bolt seat surface is formed to a predetermined surface accuracy by forging, the number of processing steps In addition, the material loss can be reduced and the cost can be reduced.

また、請求項３に記載の発明は、前記凸部が前記ボルト座面から軸方向に突出して形成され、その突出量が０．５〜２．０ｍｍの範囲に設定されていれば、例えば、鍛造工程で部材同士がぶつかり、車輪取付フランジの外径部が干渉し、その打痕によるカエリが発生してもこの凸部で許容することができると共に、マテリアルロスを最小限に抑えることができる。
Further, in the invention according to claim 3 , if the convex portion is formed to project from the bolt seat surface in the axial direction and the projecting amount is set in a range of 0.5 to 2.0 mm, for example, Even if the members collide with each other in the forging process, the outer diameter part of the wheel mounting flange interferes, and burrs caused by the dents can be allowed by this convex part, and material loss can be minimized. .

また、請求項４に記載の発明のように、前記ボルト座面が切削によりザグリ加工されていれば、ボルト座面の精度を一層向上させ、ハブボルトの密着性を高めて強度・耐久性を向上させることができる。
Further, if the bolt seat surface is counterbored by cutting as in the invention of claim 4 , the accuracy of the bolt seat surface is further improved, and the adhesion of the hub bolt is enhanced to improve the strength and durability. Can be made.

本発明に係る車輪用軸受装置は、内周に複列の外側転走面が一体に形成された外方部材と、この外方部材に内嵌され、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記外方部材または内方部材のうち回転側となる部材に車輪を取り付けるための車輪取付フランジが一体に形成され、この車輪取付フランジの周方向等配に形成された貫通孔に前記車輪を締結するハブボルトが圧入固定された車輪用軸受装置において、前記車輪取付フランジのインナー側の側面に前記ハブボルトが圧入される部位が厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブに前記ハブボルトの頭部が密着するフラットなボルト座面が形成されると共に、当該車輪取付フランジの外縁部のインナー側に鍛造加工によって前記ボルト座面に干渉しないように繭形状の凸部が形成され、この凸部が鍛造時の金型内の材料充足の判別用であるので、鍛造初期の試し打ち調整段階で充足程度の確認が容易にできる。したがって、連続生産中の抜き取り検査も簡便化できると共に、試し打ちの個数が減少し、これに伴う廃棄個数も減少して低コスト化を図ることができると共に、部材同士がぶつかる等して車輪取付フランジの外径部が干渉しても、その打痕のカエリがボルト座面の精度に影響を及ぼすことはなく、ボルト座面の面精度を確保することができる。したがって、ハブボルトがボルト座面に密着せず、使用中の摩耗等で軸力が低下してナット外れやハブボルトが折損することはなく、長期間に亘ってハブボルトの強度・耐久性を維持することができる。 The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and an inner member fitted into the outer member, and the double row outer rolling surface on the outer periphery. An inner member in which a double-row inner rolling surface facing the inner member is formed, and a double-row rolling element that is movably accommodated between the inner member and both rolling surfaces of the outer member. A wheel mounting flange for mounting a wheel to a member on the rotating side of the outer member or the inner member is integrally formed, and the wheel is inserted into a through hole formed in the circumferential direction of the wheel mounting flange. In a wheel bearing device in which a hub bolt to be fastened is press-fitted and fixed , a petal-like rib in which a portion into which the hub bolt is press-fitted on a side surface on the inner side of the wheel mounting flange becomes a thick portion is formed by forging. head of the hub bolts are in close contact with the flat board With bets seat is formed, the convex portion of the cocoon shape so as not to interfere with the bolt bearing surface by forging to the inner side of the outer edge of the wheel mounting flange is formed, the mold the projections during forging because it is a determination of the material satisfying the inner, confirmation of the order fulfillment in forging initial the trial adjustment stage can be easily. Therefore, the sampling inspection during continuous production can be simplified, the number of trial hits can be reduced, the number of discarded parts can be reduced, and the cost can be reduced. Even if the outer diameter portion of the flange interferes, the dent of the dent does not affect the accuracy of the bolt seat surface, and the surface accuracy of the bolt seat surface can be ensured. Therefore, the hub bolt does not adhere to the bolt seat surface, the axial force is not reduced due to wear during use, etc., so that the nut does not come off or the hub bolt is broken, and the strength and durability of the hub bolt are maintained for a long period of time. Can do.

外周に車体に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、車輪を取り付けるための車輪取付フランジを一端部に有し、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記車輪取付フランジの周方向等配に形成された貫通孔に前記車輪を締結するハブボルトが圧入固定された車輪用軸受装置において、前記車輪取付フランジのインナー側の側面に、前記ハブボルトが圧入される部位が厚肉部となる花弁状のリブが形成され、このリブに前記ハブボルトの頭部が密着するフラットなボルト座面が形成されると共に、当該リブの外縁部のインナー側に熱間の密閉鍛造により凸部が形成され、この凸部が、前記ボルト座面から軸方向に所定量突出し、前記ボルト座面に干渉しないように繭形状に形成されている。   A body mounting flange for mounting to the vehicle body is integrally provided on the outer periphery, an outer member having a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange for mounting a wheel at one end. A hub wheel having one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, a small-diameter step portion extending in the axial direction from the inner rolling surface, and a small-diameter step portion of the hub wheel An inner member comprising an inner ring that is press-fitted into the outer periphery and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and between the rolling surfaces of the inner member and the outer member. A wheel bearing device in which a hub bolt for fastening the wheel to a through hole formed in a circumferentially uniform manner on the wheel mounting flange is press-fitted and fixed. The hub bolt is pressed against the inner side surface of the wheel mounting flange. A petal-shaped rib is formed in which the portion to be formed is a thick part, and a flat bolt seating surface is formed on the rib so that the head portion of the hub bolt is in close contact with the rib. A convex portion is formed by hermetic forging, and the convex portion protrudes from the bolt seat surface by a predetermined amount in the axial direction, and is formed in a bowl shape so as not to interfere with the bolt seat surface.

以下、本発明の実施の形態を図面に基いて詳細に説明する。
図１は、本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図、図２（ａ）は、図１のハブ輪の鍛造完了品を示す縦断面図、（ｂ）は、（ａ）の要部拡大図、図３は、図１のハブ輪の鍛造完了品を示す正面図、図４（ａ）は、本発明に係るハブ輪同士が干渉した状態を示す説明図、（ｂ）は、（ａ）の干渉部分を示す要部拡大図である。なお、以下の説明では、車両に組み付けた状態で、車両の外側寄りとなる側をアウター側（図面左側）、中央寄り側をインナー側（図中右側）という。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, FIG. 2 (a) is a longitudinal sectional view showing a forged product of the hub wheel of FIG. 1, and FIG. FIG. 3A is a front view showing a forged product of the hub wheel of FIG. 1, and FIG. 4A is an explanatory view showing a state where the hub wheels according to the present invention interfere with each other. (B) is a principal part enlarged view which shows the interference part of (a). In the following description, the side closer to the outer side of the vehicle in the state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

この車輪用軸受装置は、内方部材１と外方部材１０と複列の転動体（ボール）６、６とを備え、従動輪側の第３世代と称される構成をなしている。内方部材１はハブ輪２と別体の内輪３とからなる。ハブ輪２は、アウター側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ４を一体に有し、外周に一方（アウター側）の内側転走面２ａと、この内側転走面２ａから軸方向に延びる小径段部２ｂが形成されている。車輪取付フランジ４の円周等配位置には車輪を固定するためのハブボルト５が植設されている。一方、内輪３は、外周に他方（インナー側）の内側転走面３ａが形成され、ハブ輪２の小径段部２ｂに所定のシメシロを介して圧入されている。そして、この小径段部２ｂの端部を径方向外方に塑性変形（揺動加締）させて形成した加締部２ｃによって軸方向に固定されている。   This wheel bearing device includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 6, 6, and is configured as a third generation on the driven wheel side. The inner member 1 includes a hub ring 2 and a separate inner ring 3. The hub wheel 2 integrally has a wheel mounting flange 4 for attaching a wheel (not shown) to an end portion on the outer side, one (outer side) inner rolling surface 2a on the outer periphery, and this inner rolling. A small diameter step 2b extending in the axial direction from the surface 2a is formed. Hub bolts 5 for fixing the wheels are planted at equal circumferential positions of the wheel mounting flanges 4. On the other hand, the inner ring 3 is formed with the other (inner side) inner rolling surface 3a on the outer periphery, and is press-fitted into the small-diameter step portion 2b of the hub ring 2 through a predetermined squeeze. The end of the small-diameter step 2b is fixed in the axial direction by a caulking portion 2c formed by plastic deformation (rocking caulking) radially outward.

外方部材１０は、外周に車体（図示せず）に取り付けられるための車体取付フランジ１０ｂを一体に有し、内周に前記内方部材１の内側転走面２ａ、３ａに対向する複列の外側転走面１０ａ、１０ａが一体に形成されている。そして、これら両転走面２ａ、１０ａおよび３ａ、１０ａ間には保持器７、７で円周等配された複列の転動体６、６がそれぞれ転動自在に収容されている。なお、外方部材１０と内方部材１間に形成される環状空間の開口部にはシール８、９（略図で示す）が装着され、軸受内部に封入された潤滑グリースの漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to a vehicle body (not shown) on the outer periphery, and a double row facing the inner rolling surfaces 2a, 3a of the inner member 1 on the inner periphery. The outer rolling surfaces 10a and 10a are integrally formed. And between these both rolling surfaces 2a, 10a and 3a, 10a, the double row rolling elements 6 and 6 equally distributed by the holder | retainers 7 and 7 are each accommodated so that rolling is possible. In addition, seals 8 and 9 (shown schematically) are attached to the opening of the annular space formed between the outer member 10 and the inner member 1, and leakage of lubricating grease sealed in the bearing and from the outside Rain water and dust are prevented from entering the bearing.

ハブ輪２はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、内側転走面２ａをはじめ、アウター側のシール８が摺接するフランジ基部４ａから小径段部２ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理が施されている。なお、加締部２ｃは鍛造後の生のままとされている。こうした高周波焼入れによりハブ輪２の強度が向上し、内輪３の嵌合面におけるフレッティング摩耗が防止されて耐久性が向上すると共に、塑性変形が容易にでき、また、揺動加締時にクラックが発生するのを防止することができる。   The hub wheel 2 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the small diameter step portion 2b from the flange base portion 4a to which the outer seal 8 comes into sliding contact, including the inner rolling surface 2a. On the other hand, the surface is hardened in a range of 58 to 64 HRC by induction hardening. The caulking portion 2c is left as it is after forging. Such induction hardening improves the strength of the hub wheel 2, prevents fretting wear on the fitting surface of the inner ring 3, improves durability, facilitates plastic deformation, and causes cracks during swing caulking. It can be prevented from occurring.

一方、内輪３および転動体６はＳＵＪ２等の高炭素クロム軸受鋼からなり、ズブ焼入れにより芯部まで５８〜６４ＨＲＣの範囲で硬化処理されている。また、外方部材１０は、ハブ輪２と同様、Ｓ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、複列の外側転走面１０ａ、１０ａが高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。なお、ここでは、転動体６にボールを用いた複列アンギュラ玉軸受を例示したが、これに限らず、転動体６に円錐ころを用いた複列円錐ころ軸受であっても良い。   On the other hand, the inner ring 3 and the rolling element 6 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core by quenching. The outer member 10 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon, such as S53C, similarly to the hub wheel 2, and the double row outer raceway surfaces 10a and 10a are formed by induction hardening. The surface hardness is set in the range of 58 to 64 HRC. In addition, although the double row angular contact ball bearing which used the ball for the rolling element 6 was illustrated here, not only this but the double row tapered roller bearing which used the tapered roller for the rolling element 6 may be sufficient.

本実施形態では、ハブ輪２が熱間の密閉鍛造により形成され、旋盤等の切削加工により所定の形状・寸法に形成された後、所定の部位が高周波焼入れにより熱処理され、その後研削加工されている。ここで、図２（ａ）は、ハブ輪２の鍛造完了品を示しているが、ハブ輪１１のアウター側の端部に径方向外方に延びる車輪取付フランジ１２が一体に形成され、この車輪取付フランジ１２のインナー側に円弧状のフランジ基部１２ａ、内側転走面１１ａおよび小径段部１１ｂがそれぞれ形成されている。そして、車輪取付フランジ１２の外縁部のインナー側に所定の凸部１３が形成されている。この凸部１３は、（ｂ）に拡大して示すように、ボルト座面１６から所定量δだけ軸方向に突出して形成されている。   In the present embodiment, the hub wheel 2 is formed by hot hermetic forging, and after being formed into a predetermined shape and size by cutting such as a lathe, a predetermined portion is heat-treated by induction hardening and then ground. Yes. Here, FIG. 2A shows a forged product of the hub wheel 2, but a wheel mounting flange 12 extending radially outward is integrally formed at the outer end of the hub wheel 11. An arcuate flange base 12a, an inner rolling surface 11a, and a small diameter step 11b are formed on the inner side of the wheel mounting flange 12, respectively. A predetermined convex portion 13 is formed on the inner side of the outer edge portion of the wheel mounting flange 12. As shown in an enlarged view in FIG. 5B, the convex portion 13 is formed so as to protrude from the bolt seat surface 16 by a predetermined amount δ in the axial direction.

ハブ輪１１は、軽量化を図るために車輪取付フランジ１２が薄肉に形成されると共に、図３に示すように、車輪取付フランジ１２のインナー側の側面１４には、鍛造工程において、ハブボルト（図示せず）が圧入される部位に、厚肉部となる花弁状のリブ１５が形成されている。これにより、軽量化を図りつつ、大きなモーメント荷重がこの車輪取付フランジ１２に負荷されても強度・剛性を確保することができ、所望の耐久性を発揮することができる。   The hub wheel 11 is formed with a thin wheel mounting flange 12 in order to reduce the weight, and as shown in FIG. 3, a hub bolt (see FIG. 3) is formed on the inner side surface 14 of the wheel mounting flange 12 in the forging process. A petal-like rib 15 serving as a thick portion is formed at a portion into which the material is not press-fitted. Thereby, strength and rigidity can be secured even when a large moment load is applied to the wheel mounting flange 12 while reducing the weight, and desired durability can be exhibited.

車輪取付フランジ１２のリブ１５にはハブボルト５が密着するフラットなボルト座面１６が形成されると共に、凸部１３がこのボルト座面１６に干渉しないように、リブ１５の外縁部に繭形状に形成されている。このように、鍛造工程で凸部１３をボルト座面１６の近傍に設けたので、この凸部１３の形状を目視確認するだけで金型内の材料が充足したか否かを容易に判別することができ、鍛造初期の試し打ち調整段階で充足程度の確認が容易にできる。したがって、連続生産中の抜き取り検査も簡便化できると共に、試し打ちの個数が減少し、これに伴う廃棄個数も減少して低コスト化を図ることができる。   The rib 15 of the wheel mounting flange 12 is formed with a flat bolt seat surface 16 on which the hub bolt 5 is closely attached, and the outer edge of the rib 15 has a hook shape so that the convex portion 13 does not interfere with the bolt seat surface 16. Is formed. Thus, since the convex part 13 was provided in the vicinity of the bolt seat surface 16 in the forging process, it is easily determined whether or not the material in the mold is satisfied only by visually confirming the shape of the convex part 13. It is possible to easily confirm the degree of satisfaction at the trial hammering adjustment stage at the beginning of forging. Therefore, the sampling inspection during the continuous production can be simplified, the number of trial hits can be reduced, and the number of discarded items can be reduced accordingly, thereby reducing the cost.

また、図４（ａ）に示すように、鍛造工程において、ハブ輪１１同士がぶつかる等して干渉する場合があるが、車輪取付フランジ１２の外径部が干渉しても、（ｂ）に示すように、車輪取付フランジ１２の外縁部に所定の凸部１３が形成されているので、その打痕のカエリ１７がボルト座面１６の精度に影響を及ぼすことはなく、ボルト座面１６の面精度を確保することができる。したがって、ハブボルト５がボルト座面１６に密着せずに使用中の摩耗等で軸力が低下してナット外れやハブボルト５が折損することはなく、長期間に亘ってハブボルト５の強度・耐久性を維持することができる。   In addition, as shown in FIG. 4A, in the forging process, the hub wheels 11 may collide with each other, but even if the outer diameter portion of the wheel mounting flange 12 interferes, As shown, since the predetermined convex portion 13 is formed on the outer edge portion of the wheel mounting flange 12, the dent 17 of the dent does not affect the accuracy of the bolt seat surface 16. Surface accuracy can be ensured. Therefore, the hub bolt 5 is not in close contact with the bolt seating surface 16, and the axial force is not reduced due to wear or the like during use, so that the nut bolt or the hub bolt 5 is not broken. The strength and durability of the hub bolt 5 over a long period of time. Can be maintained.

この凸部１３の突出量δは０．５〜２．０ｍｍの範囲に設定されている。これにより、車輪取付フランジ１２の外径部が干渉し、その打痕によるカエリ１７が発生してもこの凸部１３で許容することができると共に、マテリアルロスを最小限に抑えることができる。   The protrusion amount δ of the convex portion 13 is set in a range of 0.5 to 2.0 mm. Thereby, even if the outer diameter part of the wheel mounting flange 12 interferes and the fray 17 due to the dent is generated, it can be allowed by the convex part 13 and the material loss can be minimized.

なお、ここでは、ボルト座面１６は、ハブボルト５の圧入前に旋削等の切削加工を行わず鍛造肌のままとしているが、旋盤による切削加工やザグリ加工を行っても良い。これにより、ボルト座面１６の精度を一層向上させ、ハブボルト５の密着性を高めて強度・耐久性を向上させることができる。   Here, the bolt seat surface 16 is left forged without being subjected to cutting such as turning before press-fitting of the hub bolt 5, but may be subjected to cutting or counterboring with a lathe. Thereby, the precision of the bolt seat surface 16 can be further improved, the adhesiveness of the hub bolt 5 can be increased, and the strength and durability can be improved.

図５は、本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。なお、前述した実施形態（図１）と他同一部品、同一部位あるいは同一機能を有する部位には同じ符号を付して詳細な説明を省略する。   FIG. 5 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. In addition, the same code | symbol is attached | subjected to the part which has the same components, the same site | part, or the same function as embodiment (FIG. 1) mentioned above, and abbreviate | omits detailed description.

この車輪用軸受装置は従動輪側の第２世代と称され、外方部材１８とこの外方部材１８に複列の転動体６を介して内嵌された一対の内輪３、３とからなる内方部材１９とを備えている。   This wheel bearing device is referred to as a second generation on the driven wheel side, and includes an outer member 18 and a pair of inner rings 3 and 3 fitted into the outer member 18 via double-row rolling elements 6. And an inner member 19.

外方部材１８は、アウター側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ２０を一体に有し、内周に複列の外側転走面１０ａ、１０ａが一体に形成されている。前述した実施形態と同様、車輪取付フランジ２０が薄肉に形成されると共に、車輪取付フランジ２０のインナー側の側面１４には、鍛造工程において、ハブボルト５が圧入される部位に、厚肉部となる花弁状のリブ１５が形成されている。そして、これらハブボルト５間には円孔２０ａが形成されている。この円孔２０ａは軽量化に寄与できるだけでなく、図示しないブレーキ装置等の組立・分解工程において、レンチ等の締結治具をこの円孔２０ａから挿入することができ作業を簡便化することができる。   The outer member 18 integrally has a wheel mounting flange 20 for attaching a wheel (not shown) to an end portion on the outer side, and double row outer rolling surfaces 10a and 10a are integrally formed on the inner periphery. ing. Similar to the above-described embodiment, the wheel mounting flange 20 is formed to be thin, and the inner side surface 14 of the wheel mounting flange 20 becomes a thick portion at a portion where the hub bolt 5 is press-fitted in the forging process. Petal-like ribs 15 are formed. A circular hole 20 a is formed between the hub bolts 5. This circular hole 20a not only contributes to weight reduction, but a fastening jig such as a wrench can be inserted from the circular hole 20a in an assembly / disassembly process of a brake device (not shown) and the work can be simplified. .

外方部材１８はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼からなり、熱間の密閉鍛造を経て旋盤等の切削加工により所定の形状・寸法に形成された後、所定の部位が高周波焼入れにより熱処理され、その後研削加工されている。そして、鍛造工程で車輪取付フランジ２０の外縁部に所定の凸部１３が形成されている。これにより、外方部材１８同士の干渉により打痕が発生しても、ボルト座面１６の精度に影響を及ぼすことはなく、ボルト座面１６の面精度を確保することができる。   The outer member 18 is made of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, etc., and after being formed into a predetermined shape and size by cutting such as a lathe through hot hermetic forging, A predetermined part is heat-treated by induction hardening and then ground. And the predetermined convex part 13 is formed in the outer edge part of the wheel mounting flange 20 at the forging process. Thereby, even if a dent occurs due to interference between the outer members 18, the accuracy of the bolt seat surface 16 is not affected, and the surface accuracy of the bolt seat surface 16 can be ensured.

なお、ここでは、従動輪側の第３世代構造および第２世代構造を例示したが、本発明はこれに限らず、回転側の部材に車輪を取り付けるための車輪取付フランジを一体に有し、この車輪取付フランジにハブボルトが圧入固定されるタイプであれば、従動輪側、駆動輪側に拘わらず、あらゆる第２世代乃至第４世代構造に適用することができる。   In addition, although the 3rd generation structure and 2nd generation structure by the side of a driven wheel were illustrated here, this invention is not restricted to this, It has the wheel attachment flange for attaching a wheel to the member of a rotation side, As long as the hub bolt is press-fitted and fixed to the wheel mounting flange, it can be applied to any second generation to fourth generation structure regardless of the driven wheel side or the drive wheel side.

以上、本発明の実施の形態について説明を行ったが、本発明はこうした実施の形態に何等限定されるものではなく、あくまで例示であって、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことである。本発明の範囲は、特許請求の範囲の記載によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, it can be implemented in the following form. The scope of the present invention is defined by the terms of the claims, and includes the equivalent meanings of the claims and all modifications within the scope.

本発明に係る車輪用軸受装置は、一端部にブレーキロータを介して車輪を取り付けるための車輪取付フランジを一体に有し、この車輪取付フランジにハブボルトが圧入固定される第２世代乃至第４世代のあらゆる構造において適用が可能である。   A wheel bearing device according to the present invention has a wheel mounting flange for mounting a wheel at one end via a brake rotor, and a hub bolt is press-fitted and fixed to the wheel mounting flange. It can be applied to any structure.

本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図である。It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. （ａ）は、図１のハブ輪の鍛造完了品を示す縦断面図である。 （ｂ）は、（ａ）の要部拡大図である。(A) is a longitudinal cross-sectional view which shows the forged product of the hub wheel of FIG. (B) is the principal part enlarged view of (a). 図１のハブ輪の鍛造完了品を示す正面図である。It is a front view which shows the forge completion product of the hub ring of FIG. （ａ）は、本発明に係るハブ輪同士が干渉した状態を示す説明図である。 （ｂ）は、（ａ）の干渉部分を示す要部拡大図である。(A) is explanatory drawing which shows the state which the hub rings based on this invention interfered. (B) is a principal part enlarged view which shows the interference part of (a). 本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. 従来の車輪用軸受装置を示す要部断面図である。It is principal part sectional drawing which shows the conventional wheel bearing apparatus. （ａ）は、従来の車輪用軸受装置におけるハブ軸同士が干渉した状態を示す説明図である。 （ｂ）は、（ａ）の干渉部分を示す要部拡大図である。(A) is explanatory drawing which shows the state which the hub shafts interfered in the conventional wheel bearing apparatus. (B) is a principal part enlarged view which shows the interference part of (a).

符号の説明Explanation of symbols

１、１９・・・・・・・・・内方部材
２、１１・・・・・・・・・ハブ輪
２ａ、３ａ、１１ａ・・・・内側転走面
２ｂ、１１ｂ・・・・・・・小径段部
２ｃ・・・・・・・・・・・加締部
３・・・・・・・・・・・・内輪
４、１２、２０・・・・・・車輪取付フランジ
４ａ、１２ａ・・・・・・・フランジ基部
５・・・・・・・・・・・・ハブボルト
６・・・・・・・・・・・・転動体
７・・・・・・・・・・・・保持器
８、９・・・・・・・・・・シール
１０、１８・・・・・・・・外方部材
１０ａ・・・・・・・・・・外側転走面
１０ｂ・・・・・・・・・・車体取付フランジ
１３・・・・・・・・・・・凸部
１４・・・・・・・・・・・車輪取付フランジのインナー側の側面
１５・・・・・・・・・・・リブ
１６・・・・・・・・・・・ボルト座面
１７・・・・・・・・・・・カエリ
２０ａ・・・・・・・・・・円孔
５０、５６・・・・・・・・ハブ軸
５１・・・・・・・・・・・フランジ
５２・・・・・・・・・・・貫通孔
５３・・・・・・・・・・・ボルト
５３ａ・・・・・・・・・・頭部
５４・・・・・・・・・・・外側面
５５・・・・・・・・・・・ボルト座面
５７・・・・・・・・・・・カエリ
Ｏ・・・・・・・・・・・・ハブ軸の中心軸
Ｏ’・・・・・・・・・・・ボルトの中心軸
Ｓ・・・・・・・・・・・・ハブ軸の中心軸に直交する平面
α・・・・・・・・・・・・ボルト座面の傾斜角
δ・・・・・・・・・・・・凸部の突出量 1, 19 ..... Inward members 2, 11, ..... Hub wheels 2a, 3a, 11a ..... Inner rolling surfaces 2b, 11b ... ··· Small diameter step 2c ······················································· Inner rings 4, 12, 20 12a ... Flange base 5 ... Hub bolt 6 ... Rolling element 7 ... ..Retainer 8, 9: Seal 10, 18: Outer member 10a: Outer rolling surface 10b Car body mounting flange 13 ... Projection 14 ... Inner side surface 15 of the wheel mounting flange ... .... Rib 16 ... Bolt seating surface 17 ··· Kari 20a ························································ Hub shaft 51 .... Flange 52 ... Through hole 53 ... Bolt 53a ... Head 54 ... ······· Outside surface 55 ·········· Bolt seat surface 57 ···························· Hub axle center axis O '..... Bolt center axis S ..... plane α orthogonal to hub axle center axis ... .... Inclination angle δ of bolt bearing surface ...

Claims (4)

内周に複列の外側転走面が一体に形成された外方部材と、
この外方部材に内嵌され、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、
この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、
前記外方部材または内方部材のうち回転側となる部材に車輪を取り付けるための車輪取付フランジが一体に形成され、この車輪取付フランジの周方向等配に形成された貫通孔に前記車輪を締結するハブボルトが圧入固定された車輪用軸受装置において、
前記車輪取付フランジのインナー側の側面に前記ハブボルトが圧入される部位が厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブに前記ハブボルトの頭部が密着するフラットなボルト座面が形成されると共に、当該車輪取付フランジの外縁部のインナー側に鍛造加工によって前記ボルト座面に干渉しないように繭形状の凸部が形成され、この凸部が鍛造時の金型内の材料充足の判別用であることを特徴とする車輪用軸受装置。 An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
An inner member that is internally fitted to the outer member and has a double row inner rolling surface facing the outer rolling surface of the double row on the outer periphery,
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
A wheel mounting flange for attaching a wheel to a member on the rotating side of the outer member or the inner member is integrally formed, and the wheel is fastened to a through-hole formed in the circumferential direction of the wheel mounting flange. In the wheel bearing device in which the hub bolt to be fixed is press-fitted,
A flat bolt seating surface in which a petal-like rib whose thickened portion is formed on the side surface on the inner side of the wheel mounting flange is formed by forging, and the head of the hub bolt is in close contact with the rib Is formed on the inner side of the outer edge of the wheel mounting flange so as not to interfere with the bolt seat surface by forging , and this convex portion is the material in the mold during forging. A wheel bearing device, characterized in that it is used for discrimination of satisfaction . 前記回転側の部材が熱間の密閉鍛造により形成され、前記ボルト座面が鍛造加工により所定の面精度に形成されている請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the rotation-side member is formed by hot hermetic forging, and the bolt seat surface is formed with a predetermined surface accuracy by forging. 前記凸部が前記ボルト座面から軸方向に突出して形成され、その突出量が０．５〜２．０ｍｍの範囲に設定されている請求項１に記載の車輪用軸受装置。 2. The wheel bearing device according to claim 1 , wherein the convex portion is formed to project from the bolt seat surface in an axial direction, and a projecting amount thereof is set in a range of 0.5 to 2.0 mm. 前記ボルト座面が切削によりザグリ加工されている請求項１に記載の車輪用軸受装置。
The wheel bearing device according to claim 1 , wherein the bolt seat surface is counterbored by cutting.
JP2007147728A 2007-06-04 2007-06-04 Wheel bearing device Expired - Fee Related JP5252838B2 (en)

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