JP2013137047A - Bearing device for axle - Google Patents

Bearing device for axle Download PDF

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Publication number
JP2013137047A
JP2013137047A JP2011287861A JP2011287861A JP2013137047A JP 2013137047 A JP2013137047 A JP 2013137047A JP 2011287861 A JP2011287861 A JP 2011287861A JP 2011287861 A JP2011287861 A JP 2011287861A JP 2013137047 A JP2013137047 A JP 2013137047A
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Prior art keywords
inner ring
ring
diameter surface
hub
hub shaft
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Japanese (ja)
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淑人 ▲高▼田
Yoshito Takada
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JTEKT Corp
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JTEKT 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
    • 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)
  • Manufacturing & Machinery (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for an axle having stable strength by optimizing the shape of a hub shaft.SOLUTION: In the bearing device 1 for the axle which has an outer ring 11 formed with double tracks 11a, 11b on an inner peripheral portion, an inner ring 12 formed with an inner ring track 12a and small outside diameter surface 12d on an outer periphery, the hub shaft 13 formed with an axial track 13a, a cylindrical outer diameter surface 13e and a fitting portion side face 13k on an outer peripheral portion, and rolling elements 14A, 14B which roll between the track 11a of the outer ring 11 and the axial track 13a of the hub shaft and between the track 11b of the outer ring and the inner ring track 12a, and in which a pitch circle diameter of the outer side rolling elements 14A is larger than that of the inner side rolling elements 14B, the fitting portion side face 13k is linked to the cylindrical outer diameter surface 13e of the hub shaft 13 with one curvature surface 13f, and a radius of curvature R in an axial cross section of the curvature surface 13f is formed to be equal to difference between a radius of the cylindrical outer diameter surface 13e and that of the small outside diameter surface 12d of the inner ring 12.

Description

本発明は自動車等の車輪を支持する車軸用軸受装置に関する。   The present invention relates to an axle bearing device that supports wheels of an automobile or the like.

従来、自動車等の車両の車輪を支持する車軸用軸受装置においては、軸受として、ピッチ円直径（ＰＣＤ）の等しい複列の転動体を有する構成が一般的であった。しかし、近年の車両の高性能化や装置の小軽量化の要求によって、車軸用軸受装置を大型化させることなく、その長寿命化、高剛性化を図ることが求められている。   2. Description of the Related Art Conventionally, in an axle bearing device that supports a wheel of a vehicle such as an automobile, a configuration having a double-row rolling element having an equal pitch circle diameter (PCD) as a bearing has been common. However, due to recent demands for higher performance of vehicles and reduction in weight and weight of devices, there is a demand for longer life and higher rigidity without increasing the size of an axle bearing device.

そこで、旋回時の支持剛性を高め、軸受寿命を延ばす為、旋回時により大きな荷重を受けるアウター側列の転動体のＰＣＤをインナー側列の転動体のＰＣＤより大きくした車軸用軸受装置がある。（特許文献１参照）   Therefore, there is an axle bearing device in which the PCD of the rolling element in the outer side row, which receives a larger load during turning, is larger than the PCD of the rolling member in the inner side row in order to increase the support rigidity at the time of turning and extend the life of the bearing. (See Patent Document 1)

特開２００３―２３２３４３号公報JP 2003-232343 A

しかしながら、前述の車軸用軸受装置では両列のＰＣＤの違いによるハブ軸の外径部に段差が生じ、大径部から小径部に連なる部分には少なくとも1箇所の角部が形成されている。また、内輪嵌合部のハブフランジ側には内輪嵌合面と内輪突き当て面を有し、内輪嵌合面と内輪突き当て面の交点に隅部を有する。車両の旋回時、車軸用軸受装置に大きな負荷がかかると、前記ハブ軸の前期隅部には大きな応力が発生するため、通常、軸受部である内輪軌道から前記角部を含み、前記隅部まで連続的に高周波焼入れによって硬化処理がなされる。   However, in the above-described axle bearing device, a step is generated in the outer diameter portion of the hub shaft due to the difference in PCD between the two rows, and at least one corner portion is formed in a portion continuous from the large diameter portion to the small diameter portion. The inner ring fitting portion has an inner ring fitting surface and an inner ring abutting surface on the hub flange side, and has a corner at the intersection of the inner ring fitting surface and the inner ring abutting surface. When a large load is applied to the axle bearing device during turning of the vehicle, a large stress is generated in the first corner portion of the hub axle. Therefore, the corner portion usually includes the corner portion from the inner ring raceway which is the bearing portion. The hardening process is performed continuously by induction hardening.

高周波焼入れにおいては、角部は鈍角であっても、非常に過熱されやすく、かつ冷却されやすい。このため厳密な焼入れ条件の設定やコイルの設計が要求されるが、場合によっては焼き割れが生じることがあり、強度が不安定になる。   In induction hardening, even if the corner is obtuse, it is very easy to overheat and cool. For this reason, strict quenching conditions and coil design are required, but in some cases, quench cracks may occur and the strength becomes unstable.

この発明の目的は、ハブ軸の形状を最適化することにより、強度の安定した車軸用軸受装置を提供することにある。   An object of the present invention is to provide an axle bearing device with stable strength by optimizing the shape of the hub axle.

上記の課題を解決するため、請求項１に係る発明の構成上の特徴は、外輪、内輪、ハブ軸を有し、前記外輪の内周部に直径の異なるアウター側、インナー側の複列の軌道が形成され、前記内輪の内周部に内径面、外周部に内輪軌道、前記内輪軌道の底部からインナー側に延在して円筒状の小外径面を有し、前記ハブ軸のアウター側端部に半径方向外方に拡径するハブフランジ、中央外周部に軸軌道、前記軸軌道の底部からインナー側に向かって延在して円筒状の外径面、インナー側端部に前記内輪の内径面との嵌合面、前記嵌合面のインナー側端部から径方向外方に延在して嵌合部側面が形成され、前記外輪のアウター側軌道と前記ハブ軸の軸軌道の間で転動するアウター側転動体と、前記外輪のインナー側輪軌道と、前記内輪の内輪軌道の間で転動するインナー側転動体の２列の複数の転動体を有し、前記アウター側転動体のピッチ円直径が、前記インナー側転動体のピッチ円直径より大きい車軸用軸受装置であって、前記ハブ軸の前記円筒状の外径面と、前記ハブ軸の嵌合部側面が１つの曲面で繋がり、前記曲面の軸方向断面における曲率半径が、前記ハブ軸の円筒状の外径面と、前記内輪の小外径面との半径の差に等しいことである。   In order to solve the above-mentioned problem, the structural feature of the invention according to claim 1 includes an outer ring, an inner ring, and a hub shaft. A raceway is formed, and has an inner diameter surface on an inner peripheral portion of the inner ring, an inner ring raceway on an outer peripheral portion, a cylindrical outer diameter surface extending from a bottom portion of the inner ring raceway to an inner side, and an outer surface of the hub shaft. A hub flange that expands radially outward at the side end, an axial track at the central outer periphery, a cylindrical outer diameter surface extending from the bottom of the axial track toward the inner side, and the inner end at the inner end A fitting surface with an inner diameter surface of the inner ring, a fitting portion side surface is formed extending radially outward from an inner side end portion of the fitting surface, and an outer raceway of the outer ring and an axial raceway of the hub axle An outer side rolling element that rolls between, an inner side raceway of the outer ring, and an inner raceway of the inner ring A plurality of rolling elements in two rows of inner-side rolling elements that roll at a pitch pitch diameter of the outer-side rolling elements that is larger than the pitch-circle diameter of the inner-side rolling elements, The cylindrical outer diameter surface of the hub shaft and the fitting portion side surface of the hub shaft are connected by a single curved surface, and the radius of curvature in the axial section of the curved surface is the cylindrical outer diameter surface of the hub shaft. , Equal to the difference in radius from the small outer diameter surface of the inner ring.

高周波焼入れにおいて、角部や、曲率半径の小さい部位は過熱されやすく、かつ冷却されやすいため、焼き割れが生じ易く、強度が不安定になることある。上記構成によると、前記ハブ軸の外径面と前記嵌合部のハブフランジ側端面は接線で繋がる１つの曲面で繋がることにより角部は存在しない。また、前記曲面の曲率半径は、内輪嵌合部の剛性維持に必要なハブフランジ側端面の面積を確保した場合の最大値となる。すなわち、上記構成によるハブ軸は高周波焼入れ時の焼き割れ防止に対し最適な形状である。   In induction hardening, corners and parts having a small radius of curvature are likely to be overheated and easily cooled, so that cracks are likely to occur and the strength may become unstable. According to the above configuration, the outer diameter surface of the hub shaft and the end surface on the hub flange side of the fitting portion are connected by a single curved surface that is connected by a tangent, so that there is no corner. The curvature radius of the curved surface is the maximum value when the area of the end surface on the hub flange side necessary for maintaining the rigidity of the inner ring fitting portion is secured. That is, the hub shaft having the above-described configuration has an optimum shape for preventing cracks during induction hardening.

本発明によると、ハブ軸の形状を最適化することにより、強度の安定した車軸用軸受装置を提供することができる。   According to the present invention, it is possible to provide an axle bearing device with stable strength by optimizing the shape of the hub axle.

本発明の実施形態の車軸用軸受装置の軸方向の断面図である。It is sectional drawing of the axial direction of the bearing apparatus for axles of embodiment of this invention. 図１の主要部の拡大図である。It is an enlarged view of the principal part of FIG. 本発明の実施形態の車軸用軸受装置のハブ軸の高周波焼入れを説明する説明図である。It is explanatory drawing explaining the induction hardening of the hub axis | shaft of the axle shaft bearing apparatus of embodiment of this invention. 従来例の車軸用軸受装置のハブ軸の高周波焼入れを説明する説明図である。It is explanatory drawing explaining the induction hardening of the hub axis | shaft of the bearing apparatus for axles of a prior art example.

この発明の実施の形態を、以下図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の実施形態の車軸用軸受装置の軸方向の断面図である。図２は図１の主要部の拡大図である。図１、図２において図中左側は車両のアウター側、右側は車両のインナー側を示している。また、図中網掛け部は高周波焼入れ範囲を示している。   FIG. 1 is a sectional view in the axial direction of an axle bearing device according to an embodiment of the present invention. FIG. 2 is an enlarged view of the main part of FIG. 1 and 2, the left side in the drawing shows the outer side of the vehicle, and the right side shows the inner side of the vehicle. In the figure, the shaded area indicates the induction hardening range.

図１および図２において車軸用軸受装置１は、内周部に直径の異なる複列の外輪軌道１１ａ、１１ｂが形成された外輪１１と、外周に内輪軌道１２ａが形成された内輪１２と、外周部中央に内輪軌道１３ａ、が形成されたハブ軸１３を有する。   1 and 2, an axle bearing device 1 includes an outer ring 11 having double-row outer ring raceways 11a and 11b having different diameters formed on an inner peripheral portion, an inner ring 12 having an inner ring raceway 12a formed on an outer periphery, A hub shaft 13 having an inner ring raceway 13a is formed at the center of the section.

さらに、外輪１１のアウター側の外輪軌道１１ａとハブ軸１３の内輪軌道１３ａの間で転動する複数の転動体としての玉１４Ａと、複数の玉１４Ａを所定の間隔で保持する保持器１５Ａを有し、また、外輪１１のインナー側の外輪軌道１１ｂと内輪１２の内輪軌道１２ａの間で転動する複数の転動体としての玉１４Ｂと、複数の玉１４Ｂを所定の間隔で保持する保持器１５Ｂを有する。
ここで、アウター側の複数の玉１４ＡのＰＣＤａはインナー側の複数の玉１４ＢのＰＣＤｂより大きく、ハブ軸１３の内輪軌道１３ａの底径は内輪１２の内輪軌道１２ａの底径より大きく形成されている。 Furthermore, balls 14A as a plurality of rolling elements that roll between the outer ring raceway 11a on the outer side of the outer ring 11 and the inner ring raceway 13a of the hub axle 13, and a cage 15A that holds the plurality of balls 14A at a predetermined interval. And a ball 14B as a plurality of rolling elements rolling between the outer ring raceway 11b on the inner side of the outer ring 11 and the inner ring raceway 12a of the inner ring 12, and a cage for holding the plurality of balls 14B at a predetermined interval. 15B.
Here, the PCDa of the plurality of balls 14A on the outer side is larger than the PCDb of the plurality of balls 14B on the inner side, and the bottom diameter of the inner ring raceway 13a of the hub axle 13 is formed larger than the bottom diameter of the inner ring raceway 12a of the inner ring 12. Yes.

外輪１１は環状で一方側端部に半径方向外方に拡径して、車軸用軸受装置１を車体１８に取付けるための固定フランジ１１ｃを有し、固定フランジ１１ｃには複数の固定用ボルト穴１１ｄが設けられている。外輪１１の固定フランジ１１ｃ側の内周部には、内輪側外輪軌道１１ｂ、軸方向反対側の内周部には内輪側外輪軌道１１ｂより直径の大きなハブ軸側外輪軌道１１ａが設けられている。   The outer ring 11 is annular and has a radially outward diameter at one end, and has a fixing flange 11c for mounting the axle bearing device 1 to the vehicle body 18. The fixing flange 11c has a plurality of fixing bolt holes. 11d is provided. An inner ring side outer ring raceway 11b is provided on the inner peripheral part on the fixed flange 11c side of the outer ring 11, and a hub shaft side outer ring raceway 11a having a diameter larger than that of the inner ring side outer ring raceway 11b is provided on the inner peripheral part on the opposite side in the axial direction. .

内輪１２はＳＵＪ２等の軸受鋼からなる円環状で、外周部中央に内輪軌道１２ａ、一方側の外周部に直径Ｄ２が内輪軌道１２ａの底径と略等しい小外径面１２ｄ、他方の外周部に大外径面１２ｃが形成されている。内周部に内輪軌道１２ａと同心の内径面１２ｂを有している。また、内径面１２ｂから半径方向外方に小外径面１２ｄに向けて小端面１２ｅが延在している。   The inner ring 12 has an annular shape made of bearing steel such as SUJ2, and has an inner ring raceway 12a at the center of the outer periphery, a small outer diameter surface 12d whose diameter D2 is substantially equal to the bottom diameter of the inner ring raceway 12a, and the other outer periphery. A large outer diameter surface 12c is formed. The inner peripheral portion has an inner diameter surface 12b concentric with the inner ring raceway 12a. Further, a small end surface 12e extends radially outward from the inner diameter surface 12b toward the small outer diameter surface 12d.

ハブ軸１３はＳ５５Ｃ等の合金鋼からなる。ハブ軸１３は軸方向中央の外周部に内輪軌道１３ａ、軸方向一方側端部の外周面に半径方向外方に拡径して、図示しない車輪が取付けられるハブフランジ１３ｂを有し、ハブフランジ１３ｂには前記車輪を固定する複数のハブボルト１７ａが埋め込まれている。   The hub shaft 13 is made of an alloy steel such as S55C. The hub shaft 13 has an inner ring raceway 13a at the outer peripheral portion at the center in the axial direction, a hub flange 13b having a radially outward diameter increased at the outer peripheral surface at one end portion in the axial direction, and a wheel flange (not shown) attached thereto. A plurality of hub bolts 17a for fixing the wheel are embedded in 13b.

ハブ軸１３の内輪軌道１３ａからハブフランジ１３ｂと軸方向に反対側の外周部にはハブ軸外径面１３ｅが形成され、接線状に曲面１３ｆが連なっている。ハブ軸外径面１３ｅの直径Ｄ１は内輪軌道１３ａの底径に略等しい。曲面１３ｆは径方向内方に延在し、径方向中心軸に直角に縮径する内輪嵌合部側面１３ｋに連なる。   A hub shaft outer diameter surface 13e is formed on the outer peripheral portion of the hub shaft 13 opposite to the hub flange 13b in the axial direction from the inner ring raceway 13a, and a curved surface 13f is connected in a tangential manner. The diameter D1 of the hub shaft outer diameter surface 13e is substantially equal to the bottom diameter of the inner ring raceway 13a. The curved surface 13f extends inward in the radial direction and continues to the inner ring fitting portion side surface 13k that has a diameter reduced at right angles to the central axis in the radial direction.

内輪嵌合部側面１３ｋは内輪１２の小端面１２ｅと当接して内輪１２を保持するため、その外周端の直径は内輪１２の小外径面１２ｄの直径Ｄ２等しく形成されている。すなわち曲面１３ｆと内輪嵌合部側面１３ｋは内輪１２の小外径面１２ｄの直径Ｄ２と等しい直径で接線状に連なっている。また、曲面１３ｆの軸方向断面における曲率半径Ｒはハブ軸外径面１３ｅの直径Ｄ１と内輪１２の小外径面１２ｄの直径Ｄ２の差の１／２に等しい。   Since the inner ring fitting portion side surface 13k contacts the small end surface 12e of the inner ring 12 to hold the inner ring 12, the diameter of the outer peripheral end thereof is formed to be equal to the diameter D2 of the small outer diameter surface 12d of the inner ring 12. That is, the curved surface 13f and the inner ring fitting portion side surface 13k are connected in a tangential manner with a diameter equal to the diameter D2 of the small outer diameter surface 12d of the inner ring 12. Further, the radius of curvature R in the axial section of the curved surface 13f is equal to ½ of the difference between the diameter D1 of the hub shaft outer diameter surface 13e and the diameter D2 of the small outer diameter surface 12d of the inner ring 12.

内輪嵌合部側面１３ｋの内側隅部１３ｇから軸方向に内輪軌道１３ａと反対方向に延在する内輪嵌合部１３ｃが形成されている。
内輪嵌合部１３ｃには内輪１２が小端面１２ｅをハブ軸１３の嵌合部側面１３ｋに当接して外嵌装着されている。さらに、ハブ軸１３の端部には筒状の端部を直径方向外方に屈曲変形させて内輪１２の大端面１２ｆに押し付け、内輪１２の抜け止めを行う、かしめ部１３ｈが形成されている。 An inner ring fitting portion 13c extending in the axial direction from the inner corner portion 13g of the inner ring fitting portion side surface 13k in the direction opposite to the inner ring raceway 13a is formed.
The inner ring 12 is externally fitted to the inner ring fitting portion 13c with the small end surface 12e abutting against the fitting portion side surface 13k of the hub axle 13. Further, the end portion of the hub shaft 13 is formed with a caulking portion 13h that prevents the inner ring 12 from coming off by bending and deforming the cylindrical end portion outward in the diameter direction and pressing it against the large end surface 12f of the inner ring 12. .

図１および図２において網掛けで示すハブ軸１３の内輪軌道１３ａから外径面１３ｅ、曲面１３ｆ、内輪嵌合部側面１３ｋ、内側隅部１３ｇ、内輪嵌合部１３ｃに到る範囲は硬化処理範囲１３ｌを示し、所定の硬さ、深さの高周波焼入れによる硬化層が形成されている。   The range from the inner ring raceway 13a of the hub shaft 13 shown by hatching in FIGS. 1 and 2 to the outer diameter surface 13e, the curved surface 13f, the inner ring fitting portion side surface 13k, the inner corner portion 13g, and the inner ring fitting portion 13c is cured. The range 13l is shown, and a hardened layer is formed by induction hardening with a predetermined hardness and depth.

図３は本発明の実施形態の車軸用軸受装置のハブ軸１３の高周波焼入れを説明する説明図であり、図４は従来例の車軸用軸受装置のハブ軸１３０の高周波焼入れを説明する説明図である。
図３および図４において網掛け部は高周波焼入れによる硬化処理範囲１３ｌおよび１３０ｌを示す。 FIG. 3 is an explanatory view for explaining induction hardening of the hub shaft 13 of the axle bearing device according to the embodiment of the present invention. FIG. 4 is an explanatory view for explaining induction hardening of the hub shaft 130 of the conventional axle bearing device. It is.
3 and 4, the shaded portions indicate the curing treatment ranges 13l and 130l by induction hardening.

図３および図４において加熱用コイルは２段の半円形のコイル１７Ａ、コイル１７Ｂで構成されている。コイル１７Ａ、コイル１７Ｂに電流が流れると硬化処理範囲１３ｌおよび１３０ｌは誘導加熱により加熱される。所定の加熱時間を経過すると、硬化処理範囲１３ｌおよび１３０ｌに図に示していない冷却液が噴射され、硬化処理範囲１３ｌおよび１３０ｌは所定の硬さに硬化される。   3 and 4, the heating coil is composed of two stages of semicircular coils 17A and 17B. When an electric current flows through the coils 17A and 17B, the curing process ranges 13l and 130l are heated by induction heating. When a predetermined heating time has elapsed, a cooling liquid (not shown) is injected into the curing process ranges 13l and 130l, and the curing process ranges 13l and 130l are cured to a predetermined hardness.

高周波焼入れにおいては、角部や曲率半径の小さな曲面は加熱時の熱集中により周囲より温度が高くなり、冷却時は周囲より放熱しやすく急速に冷却され過冷却が生じることがある。
ここで、図４の従来のハブ軸１３０の高周波焼入れにおいて、硬化処理範囲１３０ｌには２箇所の角部１３０ｇ、１３０ｈが形成されており、これらの角部１３０ｇ、１３０ｈはコイル１７Ａ、コイル１７Ｂによる誘導加熱による熱集中により周囲より温度が高くなりやすい。このため角部角部１３０ｇ、１３０ｈはオーバーヒートが生じ、さらに周囲にくらべ放熱効果が大きいことによる過冷却による焼き割れが発生しやすい。 In induction hardening, a curved surface with a small corner or curvature radius has a higher temperature than the surroundings due to heat concentration during heating, and during cooling, it tends to dissipate heat from the surroundings and is rapidly cooled to cause overcooling.
Here, in the induction hardening of the conventional hub shaft 130 of FIG. 4, two corner portions 130g and 130h are formed in the curing processing range 130l, and these corner portions 130g and 130h are formed by the coils 17A and 17B. Temperature tends to be higher than the surroundings due to heat concentration by induction heating. For this reason, the corner portions 130g and 130h are overheated, and are more likely to be cracked due to overcooling due to the greater heat dissipation effect than the surrounding portions.

一方、図３のハブ軸１３は外径面１３ｅと嵌合部側面１３ｋは接線で繋がる１つの曲面１３ｆで繋がることにより角部は存在しない。また曲面１３ｆの曲率半径Ｒは内輪嵌合部側面１３ｋの必要面積を確保できる範囲で最大である。
すなわちハブ軸１３の硬化処理範囲１３ｌの形状は、オーバーヒートや過冷却が生じにくく、高周波焼入れに対し最適な形状であり、従来品にくらべ、強度が安定している。 On the other hand, the hub shaft 13 shown in FIG. 3 has no corner portion because the outer diameter surface 13e and the fitting portion side surface 13k are connected by a single curved surface 13f connected by a tangent. The curvature radius R of the curved surface 13f is the maximum within a range in which the required area of the inner ring fitting portion side surface 13k can be secured.
In other words, the shape of the curing treatment range 13l of the hub shaft 13 is less likely to cause overheating and overcooling, is an optimum shape for induction hardening, and has a stable strength as compared with the conventional product.

本実施形態における車軸用軸受装置１は複数の転動体は玉であるが、本発明では、転動体が円すいころ等のころである車軸用軸受装置であっても良い。   In the present embodiment, the plurality of rolling elements are balls in the axle bearing device 1, but in the present invention, the rolling element may be an axle bearing device in which a roller such as a tapered roller is used.

１ ‥ 車軸用軸受装置
１１ ‥ 外輪
１１ａ、１１ｂ ‥ 軌道
１２ ‥ 内輪
１２ａ ‥ 内輪軌道
１２ｂ ‥ 内径面
１２ｄ ‥ 小外径面
１３ ‥ ハブ軸
１３ａ ‥ 軸軌道
１３ｂ ‥ ハブフランジ
１３ｃ ‥ 嵌合面
１３ｅ ‥ 外径面
１３ｆ ‥ 曲面
１３ｃ ‥ 嵌合部
１３ｋ ‥ 嵌合部側面
１４Ａ、１４Ｂ ‥ 玉（転動体） DESCRIPTION OF SYMBOLS 1 ... Bearing apparatus for axles 11 Outer ring 11a, 11b Raceway 12 Inner ring 12a Inner ring raceway 12b Inner diameter surface 12d Small outer diameter surface 13 Hub shaft 13a Shaft track 13b Hub flange 13c Fitting surface 13e Outside diameter surface 13f Curved surface 13c Fitting part 13k Fitting side surface 14A, 14B Ball (rolling element)

Claims (1)

外輪、内輪、ハブ軸を有し、
前記外輪の内周部に直径の異なるアウター側、インナー側の複列の軌道が形成され、
前記内輪の内周部に内径面、外周部に内輪軌道、前記内輪軌道の底部からインナー側に延在して円筒状の小外径面が形成され、
前記ハブ軸のアウター側端部に半径方向外方に拡径するハブフランジ、中央外周部に軸軌道、前記軸軌道の底部からインナー側に向かって延在して円筒状の外径面、インナー側端部に前記内輪の内径面との嵌合面、前記嵌合面のインナー側端部から径方向外方に延在して嵌合部側面が形成され、
前記外輪のアウター側軌道と前記ハブ軸の軸軌道の間で転動するアウター側転動体と、前記外輪のインナー側輪軌道と、前記内輪の内輪軌道の間で転動するインナー側転動体の２列の複数の転動体を有し、
前記アウター側転動体のピッチ円直径が、前記インナー側転動体のピッチ円直径より大きい車軸用軸受装置であって、
前記ハブ軸の前記円筒状の外径面と、前記ハブ軸の嵌合部側面が１つの曲面で繋がり、前記曲面の軸方向断面における曲率半径が、前記ハブ軸の円筒状の外径面と、前記内輪の小外径面との半径の差に等しく形成されていることを特徴とする車軸用軸受装置。 Has an outer ring, an inner ring, a hub axle,
A double-row track on the outer side and inner side with different diameters is formed on the inner periphery of the outer ring,
An inner diameter surface on the inner peripheral portion of the inner ring, an inner ring raceway on the outer peripheral portion, a cylindrical small outer diameter surface is formed extending from the bottom of the inner ring raceway to the inner side,
A hub flange that expands radially outward at the outer end of the hub axle, a shaft raceway at the center outer periphery, a cylindrical outer diameter surface that extends from the bottom of the shaft race toward the inner side, an inner A fitting surface with the inner diameter surface of the inner ring at the side end portion, a fitting portion side surface is formed extending radially outward from an inner side end portion of the fitting surface,
An outer-side rolling element that rolls between an outer race of the outer ring and an axial race of the hub shaft, an inner-side rolling element that rolls between an inner-side race of the outer ring, and an inner-ring race of the inner ring. Having two rows of rolling elements,
An axle bearing device in which a pitch circle diameter of the outer rolling element is larger than a pitch circle diameter of the inner rolling element,
The cylindrical outer diameter surface of the hub shaft and the fitting portion side surface of the hub shaft are connected by a single curved surface, and the radius of curvature in the axial section of the curved surface is the cylindrical outer diameter surface of the hub shaft. The axle bearing device is formed to be equal to a difference in radius from the small outer diameter surface of the inner ring.
JP2011287861A 2011-12-28 2011-12-28 Bearing device for axle Pending JP2013137047A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61103009A (en) * 1984-10-22 1986-05-21 エスケーエフ　インダストリアル　トレイデイング　アンド　デベロツプメント　カンパニイ　ビー　ヴイ Roller bearing unit
JP2007315508A (en) * 2006-05-26 2007-12-06 Ntn Corp Bearing device for wheel
JP2011051474A (en) * 2009-09-02 2011-03-17 Ntn Corp Bearing device for wheel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61103009A (en) * 1984-10-22 1986-05-21 エスケーエフ　インダストリアル　トレイデイング　アンド　デベロツプメント　カンパニイ　ビー　ヴイ Roller bearing unit
JP2007315508A (en) * 2006-05-26 2007-12-06 Ntn Corp Bearing device for wheel
JP2011051474A (en) * 2009-09-02 2011-03-17 Ntn Corp Bearing device for wheel

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