JP2013155842A - Mounting structure of inner ring of bearing, and bearing device for wheel - Google Patents

Mounting structure of inner ring of bearing, and bearing device for wheel Download PDF

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JP2013155842A
JP2013155842A JP2012018515A JP2012018515A JP2013155842A JP 2013155842 A JP2013155842 A JP 2013155842A JP 2012018515 A JP2012018515 A JP 2012018515A JP 2012018515 A JP2012018515 A JP 2012018515A JP 2013155842 A JP2013155842 A JP 2013155842A
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inner ring
wheel
ring
hub
bearing
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Yutaka Koma
豊 高麗
Yasuo Asai
康夫 浅井
Satoshi Kitagawa
悟志 北河
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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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16C33/62—Selection of substances
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
    • 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
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/70—Ferrous alloys, e.g. steel alloys with chromium as the next major constituent
    • 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)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of an inner ring of a bearing, which can prevent occurrence of cracks of the inner ring by hydrogen embrittlement due to use under a corrosion environment even in a case wherein the hoop stress applied to the inner ring exceeds 300 MPa, and to provide a bearing device for a wheel.SOLUTION: In a structure of mounting an inner ring 7 to a hub ring 6 by inserting the hub ring 6 into the inner ring 7 and caulking an insertion end part of the hub ring 6, the inner ring 7 is mounted to the hub ring 6 in a state that the hoop stress exceeding 300 MPa is applied, and is formed from a carburized steel containing chrome of 0.50-1.50 mass%.

Description

本発明は、軸受用内輪の取付構造及び車輪用軸受装置に関する。   The present invention relates to a bearing inner ring mounting structure and a wheel bearing device.

従来の車輪用軸受装置として、中心軸線の回りに回転可能なハブ輪と、このハブ輪を車体側に回転可能に支持する玉軸受とを備えたものがある（例えば特許文献１）。   As a conventional wheel bearing device, there is one provided with a hub wheel that can rotate around a central axis and a ball bearing that rotatably supports the hub wheel on the vehicle body side (for example, Patent Document 1).

このような車輪用軸受装置において、ハブ輪に対する玉軸受の取り付けは、図２（ａ）に示すように玉軸受１００（内輪１０１，外輪１０２及び転動体１０３）の内輪１０１にハブ輪１０４を挿通させ、図２（ｂ）に示すようにハブ輪１０４の挿通端部１０４ａを内輪１０１の端面１０１ａへかしめることにより行われる。   In such a wheel bearing device, the ball bearing is attached to the hub ring by inserting the hub ring 104 through the inner ring 101 of the ball bearing 100 (the inner ring 101, the outer ring 102 and the rolling element 103) as shown in FIG. 2B, the insertion end 104a of the hub wheel 104 is caulked to the end surface 101a of the inner ring 101 as shown in FIG.

ところで、この種の車輪用軸受装置においては、腐食環境下での使用に対する耐食性を得る目的から、例えば３質量％以上１５質量％以下のクロム（Ｃｒ）を含有する合金鋼によって内輪１０１を形成し、内輪１０１に作用するフープ応力σｆを１５０ＭＰａ≦σｆ≦３００ＭＰａに管理することが行われる。 By the way, in this type of wheel bearing device, the inner ring 101 is formed of alloy steel containing, for example, 3 mass% or more and 15 mass% or less chromium (Cr) for the purpose of obtaining corrosion resistance against use in a corrosive environment. The hoop stress σ f acting on the inner ring 101 is managed to 150 MPa ≦ σ f ≦ 300 MPa.

特開２００５−１３３７６８号JP 2005-133768 A

しかしながら、特許文献１に示す車輪用軸受装置によると、内輪１０１に作用するフープ応力が３００ＭＰａを超える場合には、転動体１０３の転動による繰り返しの剪断応力に加えて過大なフープ応力が内輪１０１に作用するため、転がり疲労によって転がり寿命が低下するばかりか、酸化膜の破壊によって錆の生成も促進され、腐食環境下での使用によって内輪１０１がいわゆる水素脆化割れ（水素脆化による内輪割れ）する虞がある。   However, according to the wheel bearing device shown in Patent Document 1, when the hoop stress acting on the inner ring 101 exceeds 300 MPa, excessive hoop stress is added to the inner ring 101 in addition to repeated shear stress due to rolling of the rolling element 103. Therefore, the rolling life is reduced by rolling fatigue, and the generation of rust is also promoted by the destruction of the oxide film. The inner ring 101 is so-called hydrogen embrittlement crack (inner ring cracking due to hydrogen embrittlement) when used under corrosive environment )

従って、本発明の目的は、内輪に作用するフープ応力が３００ＭＰａを超える場合において、腐食環境での使用による内輪の水素脆化割れの発生を抑制することができる軸受用内輪の取付構造及び車輪用軸受装置を提供することにある。   Accordingly, an object of the present invention is to provide a bearing inner ring mounting structure and a wheel that can suppress the occurrence of hydrogen embrittlement cracking of the inner ring due to use in a corrosive environment when the hoop stress acting on the inner ring exceeds 300 MPa. It is to provide a bearing device.

本発明者は、内輪に作用するフープ応力が３００ＭＰａを超える場合において、腐食環境下での使用による内輪の水素脆化割れの発生を抑制することができる軸受用内輪の取付構造及び車輪用軸受装置を得るための検討を開始したが、その過程において次に示す手段を採用すると、上記した所望の効果をもつ軸受用内輪の取付構造及び車輪用軸受装置が得られることを見出した。   The present inventor has disclosed a bearing inner ring mounting structure and a wheel bearing device capable of suppressing the occurrence of hydrogen embrittlement cracking of the inner ring due to use in a corrosive environment when the hoop stress acting on the inner ring exceeds 300 MPa. However, it has been found that when the following means are employed in the process, the bearing inner ring mounting structure and the wheel bearing device having the above-described desired effects can be obtained.

（１）本発明は、上記目的を達成するために、転動体を転動させる内輪を有する転がり軸受を介して車体側にハブ輪を回転可能に支持する車輪用軸受装置において、前記内輪に前記ハブ輪を挿通させ、前記ハブ輪の車体側挿通端部及び車輪側挿通端部のうち車体側挿通端部を前記内輪の車体側端面へかしめることにより、前記ハブ輪に前記内輪を取り付ける構造であって、前記内輪は、３００ＭＰａを超えるフープ応力が作用する状態で前記ハブ輪に取り付けられ、かつ０．５０質量％以上１．５０質量％以下のクロムを含有する浸炭鋼によって形成されている軸受用内輪の取付構造。 (1) In order to achieve the above object, the present invention provides a wheel bearing device in which a hub ring is rotatably supported on a vehicle body via a rolling bearing having an inner ring that rolls rolling elements. A structure for attaching the inner ring to the hub ring by inserting the hub ring and caulking the vehicle body side insertion end of the hub ring to the vehicle body side end surface of the inner ring. And the said inner ring | wheel is attached to the said hub ring | wheel in the state in which the hoop stress exceeding 300 MPa acts, and is formed with the carburized steel containing 0.50 mass% or more and 1.50 mass% or less chromium. Mounting structure for bearing inner ring.

（２）本発明は、上記目的を達成するために、上記（１）に記載の軸受用内輪の取付構造を用いて構成された車輪用軸受装置。 (2) In order to achieve the above object, the present invention provides a wheel bearing device configured using the bearing inner ring mounting structure described in (1) above.

本発明によると、内輪に作用するフープ応力が３００ＭＰａを超える場合において、腐食環境下での使用による内輪の水素脆化割れの発生を抑制することができる。   According to the present invention, when the hoop stress acting on the inner ring exceeds 300 MPa, the occurrence of hydrogen embrittlement cracks in the inner ring due to use in a corrosive environment can be suppressed.

本発明の実施の形態に係る車輪用軸受装置の全体を説明するために示す断面図。Sectional drawing shown in order to demonstrate the whole wheel bearing apparatus which concerns on embodiment of this invention. （ａ）及び（ｂ）は、軸受用内輪の取付方法を説明するために示す断面図。（ａ）は軸受用内輪の取付前を、また（ｂ）は軸受用内輪の取付後をそれぞれ示す。(A) And (b) is sectional drawing shown in order to demonstrate the attachment method of the inner ring | wheel for bearings. (A) shows before mounting of the bearing inner ring, and (b) shows after mounting of the bearing inner ring.

[実施の形態]
（車輪用軸受装置の全体構成）
図１は車輪用軸受装置の全体を示す。図１に示すように、車輪用軸受装置１は、例えば駆動輪用軸受装置からなり、中心軸線Ｏの回りに回転可能な内方部材２と、この内方部材２の外周囲に配置された外方部材３と、この外方部材３と内方部材２との間に介在する複列の転動体４，５とを備え、車体（図示せず）と車輪（図示せず）との間に配置されている。そして、車輪用軸受装置１は、内輪７（後述），外方部材３及び転動体４，５を有する転がり軸受（円すいころ軸受）を介して車体（車両インナ）側にハブ輪６を回転可能に支持するように構成されている。円すいころ軸受は、後述するパルサーリング９，ＡＢＳセンサ１０，ころ保持器１１・１３及びシール部材１２・１４等と共に軸受アッシー（図示せず）を構成する。 [Embodiment]
(Whole configuration of wheel bearing device)
FIG. 1 shows the entire wheel bearing device. As shown in FIG. 1, the wheel bearing device 1 includes, for example, a drive wheel bearing device, and is disposed on an inner member 2 that can rotate around a central axis O and on the outer periphery of the inner member 2. An outer member 3 and double-row rolling elements 4 and 5 interposed between the outer member 3 and the inner member 2 are provided between a vehicle body (not shown) and a wheel (not shown). Is arranged. The wheel bearing device 1 can rotate the hub wheel 6 toward the vehicle body (vehicle inner) via a rolling bearing (tapered roller bearing) having an inner ring 7 (described later), an outer member 3 and rolling elements 4 and 5. It is comprised so that it may support. The tapered roller bearing constitutes a bearing assembly (not shown) together with a pulsar ring 9, an ABS sensor 10, roller cages 11 and 13, seal members 12 and 14 which will be described later.

（内方部材２の構成）
内方部材２は、ハブ輪６及び内輪７からなり、中心軸線Ｏ上に回転可能に配置されている。 (Configuration of the inner member 2)
The inner member 2 includes a hub ring 6 and an inner ring 7, and is disposed on the central axis O so as to be rotatable.

ハブ輪６は、各外径が互いに異なる大小２つの胴部６ａ，６ｂ（大径の胴部６ａ，小径の胴部６ｂ）を有し、ドライブシャフト（図示せず）に等速自在継手（図示せず）等を介してトルク伝達可能に連結され、かつナット止めされ、全体が例えば中炭素鋼からなる円筒状の成形体によって形成されている。ハブ輪６には、中心軸線Ｏに沿って両方向に開口する貫通孔６ｃが設けられている。貫通孔６ｃの内周部には、等速自在継手のステム（図示せず）を連結するためのセレーション（図示せず）が形成されている。   The hub wheel 6 has two large and small body portions 6a and 6b (large diameter body portion 6a and small diameter body portion 6b) having different outer diameters, and a constant velocity universal joint (not shown) is connected to a drive shaft (not shown). (Not shown) and the like are connected to each other so as to be able to transmit torque and are fastened with nuts, and the whole is formed by a cylindrical molded body made of, for example, medium carbon steel. The hub wheel 6 is provided with a through hole 6c that opens in both directions along the central axis O. A serration (not shown) for connecting a stem (not shown) of a constant velocity universal joint is formed on the inner peripheral portion of the through hole 6c.

大径の胴部６ａは、ハブ輪６の車輪側（図１の左側）に配置されている。大径の胴部６ａには、その外周面に車輪側で突出し、車輪（図示せず）を取り付けるための円環状の車輪取付用フランジ６０ａが一体に設けられている。車輪取付用フランジ６０ａには、円周方向に並列し、かつハブボルト８を挿通させる複数のボルト挿通孔６００ａ（１個のみ図示）が設けられている。   The large-diameter trunk 6a is disposed on the wheel side of the hub wheel 6 (left side in FIG. 1). The large-diameter trunk portion 6a is integrally provided with an annular wheel mounting flange 60a that protrudes on the outer peripheral surface on the wheel side and for mounting a wheel (not shown). The wheel mounting flange 60a is provided with a plurality of bolt insertion holes 600a (only one is shown) through which the hub bolt 8 is inserted in parallel in the circumferential direction.

小径の胴部６ｂは、径方向に開口する円環状の凹部６０ｂを外周面に有し、ハブ輪６の車体側（図１の右側）に配置されている。そして、小径の胴部６ｂは、内輪７を挿通し、これら両挿通端部（図１において、右側の車体側挿通端部及び左側の車輪側挿通端部）のうち車体側挿通端部を内輪７（第２の内輪部材７１）の車体側端面７１ｂへかしめて（塑性変形させて）かしめ部６２ｂを形成することにより、凹部６０ｂに内輪７を取り付けるように構成されている。   The small-diameter trunk portion 6b has an annular recess 60b that opens in the radial direction on the outer peripheral surface, and is disposed on the vehicle body side of the hub wheel 6 (right side in FIG. 1). The small-diameter body portion 6b is inserted through the inner ring 7, and the vehicle body side insertion end portion of these insertion end portions (the right vehicle body side insertion end portion and the left wheel side insertion end portion in FIG. 1) is used as the inner ring. 7 (second inner ring member 71) is crimped (plastically deformed) to the vehicle body side end surface 71b to form the caulking portion 62b, so that the inner ring 7 is attached to the recess 60b.

一方、内輪７は、第１の内輪部材７０及び第２の内輪部材７１からなり、中心軸線Ｏ方向に互いに並列して配置され、かつハブ輪６の凹部６０ｂ内に３００ＭＰａを超えるフープ応力σｆ（σｆ≧３００ＭＰａ）が作用する状態で取り付けられ、全体がクロム（Ｃｒ）を含有する浸炭鋼からなる円筒状の成形体によって形成されている。Ｃｒの含有量は、０．５０質量％以上１．５０質量％以下に設定されている。これにより、内輪７において、疲労強度（転動体１０３による転がり強度）が高められるとともに、耐食性が得られる。また、内輪７は、３００ＭＰａを超えるフープ応力σｆが作用する状態でハブ輪６に取り付けられているため、ハブ輪６に対する取り付けが強固に行われる。 On the other hand, the inner ring 7 includes a first inner ring member 70 and a second inner ring member 71, which are arranged in parallel to each other in the direction of the central axis O, and have a hoop stress σ f exceeding 300 MPa in the recess 60b of the hub ring 6. It is attached in a state where (σ f ≧ 300 MPa) acts, and the whole is formed by a cylindrical shaped body made of carburized steel containing chromium (Cr). Content of Cr is set to 0.50 mass% or more and 1.50 mass% or less. Thereby, in the inner ring 7, fatigue strength (rolling strength by the rolling element 103) is increased and corrosion resistance is obtained. Further, since the inner ring 7 is attached to the hub ring 6 in a state where a hoop stress σ f exceeding 300 MPa is applied, the inner ring 7 is firmly attached to the hub ring 6.

第１の内輪部材７０は、複列の転動体４，５の車輪側列の転動体４を転動させる第１の内側軌道面７０ａ、及びこの第１の内側軌道面７０ａに仕切部７０ｂを介して並列するリング取付面７０ｃを有し、内輪７の車輪側に中心軸線Ｏに沿って配置されている。   The first inner ring member 70 includes a first inner raceway surface 70a for rolling the rolling elements 4 in the wheel side row of the double row rolling elements 4 and 5, and a partition portion 70b on the first inner raceway surface 70a. And the ring mounting surface 70c is arranged along the central axis O on the wheel side of the inner ring 7.

第１の内側軌道面７０ａは、第１の内輪部材７０の車輪側に配置されている。また、第１の内側軌道面７０ａは、第１の内輪部材７０の外周部に円環状の凹溝７０ｄを形成することにより、その溝底に設けられている。第１の内側軌道面７０ａの外径は、車体側から車輪側に向かって漸次大きくなる寸法に設定されている。   The first inner raceway surface 70 a is disposed on the wheel side of the first inner ring member 70. Further, the first inner raceway surface 70 a is provided at the groove bottom by forming an annular groove 70 d on the outer peripheral portion of the first inner ring member 70. The outer diameter of the first inner raceway surface 70a is set to a dimension that gradually increases from the vehicle body side toward the wheel side.

仕切部７０ｂは、第１の内輪部材７０の軸線方向略中央部に配置されている。また、仕切部７０ｂは、第１の内側軌道面７０ａの最小外径及びリング取付面７０ｃの外径よりも大きい外径をもつ略均一な円筒状の胴部によって形成されている。   The partition portion 70 b is disposed at a substantially central portion in the axial direction of the first inner ring member 70. The partition 70b is formed by a substantially uniform cylindrical body having an outer diameter larger than the minimum outer diameter of the first inner raceway surface 70a and the outer diameter of the ring mounting surface 70c.

リング取付面７０ｃは、第１の内輪部材７０の車体側に配置されている。リング取付面７０ｃには、円周方向に沿って凹部及び凸部（共に図示せず）を交互に形成してなる回転速度検出用リングとしてのパルサーリング９が圧入して取り付けられている。パルサーリング９としては、例えばフェライト系のステンレス鋼粉を用いた焼結金属が用いられる。   The ring attachment surface 70 c is disposed on the vehicle body side of the first inner ring member 70. A pulsar ring 9 as a rotational speed detection ring formed by alternately forming recesses and protrusions (both not shown) along the circumferential direction is press-fitted and attached to the ring attachment surface 70c. As the pulsar ring 9, for example, a sintered metal using ferritic stainless steel powder is used.

第２の内輪部材７１は、第１の内側軌道面７０ａにリング取付面７０ｃを介して並列し、かつ複列の転動体４，５のうち車体側列の転動体５を転動させる第２の内側軌道面７１ａを有し、第１の内輪部材７０の車体側に中心軸線Ｏに沿って配置されている。   The second inner ring member 71 is parallel to the first inner raceway surface 70a via the ring mounting surface 70c, and the second inner ring member 71 rolls the rolling element 5 in the vehicle body side row of the double row rolling elements 4, 5. The inner raceway surface 71a is arranged along the central axis O on the vehicle body side of the first inner ring member 70.

第２の内側軌道面７１ａは、第２の内輪部材７１の軸線方向略中央部に配置されている。また、第２の内側軌道面７１ａは、第２の内輪部材７１の外周部に円環状の凹溝７１ｄを形成することにより、その溝底に設けられている。第２の内側軌道面７１ａの外径は、車輪側から車体側に向かって漸次大きくなる寸法に設定されている。   The second inner raceway surface 71 a is disposed at a substantially central portion in the axial direction of the second inner ring member 71. The second inner raceway surface 71 a is provided at the groove bottom by forming an annular concave groove 71 d on the outer peripheral portion of the second inner ring member 71. The outer diameter of the second inner raceway surface 71a is set to a dimension that gradually increases from the wheel side toward the vehicle body side.

（外方部材３の構成）
外方部材３は、複列の転動体４，５をそれぞれ転動させる外側軌道面３ａ，３ｂを有し、車体側に懸架装置（図示せず）の構成部品としてのナックル（図示せず）を介して取り付けられ、全体が中心軸線Ｏの両方向に開口する例えば中炭素鋼からなる円筒状の成形体によって形成されている。そして、外方部材３は、車輪用軸受装置１の外輪として機能するように構成されている。 (Configuration of the outer member 3)
The outer member 3 has outer raceway surfaces 3a and 3b for rolling the double row rolling elements 4 and 5, respectively, and a knuckle (not shown) as a component part of a suspension device (not shown) on the vehicle body side. The whole is formed by a cylindrical shaped body made of, for example, medium carbon steel that opens in both directions of the central axis O. The outer member 3 is configured to function as an outer ring of the wheel bearing device 1.

外方部材３には、その内外周面に開口し、かつＡＢＳ（Anti-Lock Brake System）センサ１０を取り付けるためのセンサ取付孔３ｃが設けられている。ＡＢＳセンサ１０は、その検出部がパルサーリング９の外周面に対応する位置に配置され、パルサーリング９と共に車軸の回転速度を検出するように構成されている。ＡＢＳセンサ１０としては、例えばホール素子や磁気抵抗素子など磁気検出素子が用いられる。   The outer member 3 is provided with a sensor mounting hole 3c that opens to the inner and outer peripheral surfaces and for mounting an ABS (Anti-Lock Brake System) sensor 10. The ABS sensor 10 is configured such that its detection portion is disposed at a position corresponding to the outer peripheral surface of the pulsar ring 9 and detects the rotational speed of the axle together with the pulsar ring 9. As the ABS sensor 10, for example, a magnetic detection element such as a Hall element or a magnetoresistive element is used.

（複列の転動体４，５の構成）
車輪側列の転動体４は、円すいころからなり、第１の内輪部材７０における第１の内側軌道面７０ａと外方部材３の外側軌道面３ａとの間に介在して配置され、かつころ保持器１１によって転動可能に保持されている。転動体４の車輪側には、第１の内輪部材７０の外周面と外方部材３の内周面との間に介在する車輪側のシール部材１２が配置されている。 (Configuration of double row rolling elements 4 and 5)
The rolling elements 4 in the wheel side row are formed of tapered rollers, are disposed between the first inner raceway surface 70a of the first inner ring member 70 and the outer raceway surface 3a of the outer member 3, and are rollers. The cage 11 is held so that it can roll. On the wheel side of the rolling element 4, a wheel-side seal member 12 interposed between the outer peripheral surface of the first inner ring member 70 and the inner peripheral surface of the outer member 3 is disposed.

車体側列の転動体５は、円すいころからなり、第２の内輪部材７１の第２の内側軌道面７１ａと外方部材３の外側軌道面３ｂとの間に介在して配置され、かつころ保持器１３（図示せず）によって転動可能に保持されている。転動体５の車体側には、第２の内輪部材７１の外周面と外方部材３の内周面との間に介在する車体側のシール部材１４が配置されている。   The rolling elements 5 in the vehicle body side row are formed of tapered rollers, are disposed between the second inner raceway surface 71a of the second inner ring member 71 and the outer raceway surface 3b of the outer member 3, and are rollers. The cage 13 (not shown) is held so as to be able to roll. On the vehicle body side of the rolling element 5, a vehicle body side seal member 14 interposed between the outer peripheral surface of the second inner ring member 71 and the inner peripheral surface of the outer member 3 is disposed.

（車輪用軸受装置１における内輪７の取付方法）
本実施の形態に示す車輪用軸受装置１のハブ輪６に対する内輪７の取り付けは、次に示すようにして行われる。すなわち、予め組み立てられた軸受アッシー（パルサーリング９，ＡＢＳセンサ１０，ころ保持器１１・１３及びシール部材１２・１４等からなる組立体）の内輪７に素材としてのハブ輪６を挿通させ、このハブ輪６の車体側挿通端部及び車輪側挿通端部のうち車体側挿通端部を第２の内輪部材７１の車体側端面７１ｂにかしめる。この際、ハブ輪６のかしめは、３００ＭＰａを超えるフープ応力σｆを内輪７に発生させた状態で行われる。 (Mounting method of the inner ring 7 in the wheel bearing device 1)
The inner ring 7 is attached to the hub ring 6 of the wheel bearing device 1 shown in the present embodiment as follows. That is, a hub ring 6 as a material is inserted into an inner ring 7 of a pre-assembled bearing assembly (an assembly including a pulsar ring 9, an ABS sensor 10, roller cages 11 and 13, and seal members 12 and 14). The vehicle body side insertion end portion of the hub wheel 6 and the wheel side insertion end portion are caulked to the vehicle body side end surface 71 b of the second inner ring member 71. At this time, the caulking of the hub ring 6 is performed in a state where a hoop stress σ f exceeding 300 MPa is generated in the inner ring 7.

このようにして、ハブ輪６の車体側挿通端部がかしめられると、ハブ輪６にかしめ部６２ｂが形成され、ハブ輪６に対して内輪７が強固に取り付けられる。   Thus, when the vehicle body side insertion end portion of the hub wheel 6 is caulked, the caulking portion 62 b is formed in the hub wheel 6, and the inner ring 7 is firmly attached to the hub wheel 6.

このように構成された車輪用軸受装置１においては、内輪７が浸炭鋼によって形成されているため、例えば軸受鋼に比べて表面に圧縮残留応力を有し、疲労強度が向上する。   In the wheel bearing device 1 configured as described above, the inner ring 7 is formed of carburized steel, and therefore has a compressive residual stress on the surface as compared with, for example, bearing steel, and fatigue strength is improved.

また、内輪７のクロム含有量が０．５０質量％以上１．５０質量％以下に設定されているため、内輪７が耐食性を有し、腐食環境下での使用によっても錆の生成が促進されない。なお、内輪７の材料としての浸炭鋼において、クロム含有量が０．５０質量％未満である場合には腐食抑制効果が不十分であり、一方クロム含有量が１．５０質量％よりも大きい場合には内輪７の加工性及び表面硬さが低下する。   Moreover, since the chromium content of the inner ring 7 is set to 0.50 mass% or more and 1.50 mass% or less, the inner ring 7 has corrosion resistance, and the generation of rust is not promoted even when used in a corrosive environment. . In the case of the carburized steel as the material of the inner ring 7, when the chromium content is less than 0.50% by mass, the corrosion inhibiting effect is insufficient, while the chromium content is greater than 1.50% by mass. However, the workability and surface hardness of the inner ring 7 are reduced.

そして、ハブ輪６に対する内輪７の取付時（ハブ輪６のかしめ時）に内輪７に作用するフープ応力σｆが３００ＭＰａを超えても、疲労強度の向上によって転がり寿命が低下せず、また車輪用軸受装置１の腐食環境下での使用によっても内輪７が腐食されない。 Even when the hoop stress σ f acting on the inner ring 7 when the inner ring 7 is attached to the hub ring 6 (when the hub ring 6 is caulked) exceeds 300 MPa, the rolling life does not decrease due to the improvement in fatigue strength. The inner ring 7 is not corroded even when the bearing device 1 is used in a corrosive environment.

従って、本実施の形態においては、ハブ輪６に対する内輪７の取付時に内輪７に作用するフープ応力σｆが３００ＭＰａを超える場合においても内輪７の水素脆化割れの発生を抑制することができる。 Therefore, in the present embodiment, the occurrence of hydrogen embrittlement cracking of the inner ring 7 can be suppressed even when the hoop stress σ f acting on the inner ring 7 when the inner ring 7 is attached to the hub ring 6 exceeds 300 MPa.

このことは、各材料が互いに異なる複数種の内輪７を用意し、これら各種内輪７のハブ輪６に対する取付時にそれぞれフープ応力σｆが３００ＭＰａを含む種々の大きさとなるようにかしめ力を調整して得られた複数種の車輪用軸受装置１を腐食環境下で使用して実施する幾多の実験によって確認されている。 This is because a plurality of types of inner rings 7 with different materials are prepared, and the caulking force is adjusted so that the hoop stress σ f has various sizes including 300 MPa when the various inner rings 7 are attached to the hub ring 6. It has been confirmed by a number of experiments carried out using a plurality of types of wheel bearing devices 1 obtained in this manner in a corrosive environment.

これより、内輪７に浸炭鋼（０．５０質量％以上１．５０質量％以下のクロム含有量）を用いた場合の限界フープ応力（車輪用軸受装置１の腐食環境下での使用によって内輪７に水素脆化割れが生じない上限のフープ応力）は、内輪７に他の材料（例えば軸受鋼）を用いた場合の限界フープ応力よりも高いことが知得された。   From this, the limit hoop stress when the carburized steel (the chromium content of 0.50% by mass or more and 1.50% by mass or less) is used for the inner ring 7 (the inner ring 7 depending on use in the corrosive environment of the wheel bearing device 1). It has been found that the upper limit hoop stress at which no hydrogen embrittlement cracking occurs is higher than the limit hoop stress when another material (for example, bearing steel) is used for the inner ring 7.

[実施の形態の効果]
以上説明した実施の形態によれば、次に示す効果が得られる。 [Effect of the embodiment]
According to the embodiment described above, the following effects can be obtained.

ハブ輪６に対する内輪７の取付時にハブ輪６から作用するフープ応力σｆが３００ＭＰａを超えても、疲労強度の向上によって転がり寿命が低下せず、また車輪用軸受装置１の腐食環境下での使用によっても内輪７が腐食されないため、内輪７に作用するフープ応力σｆが３００ＭＰａを超える場合においても内輪７の水素脆化割れの発生を抑制することができる。 Even when the hoop stress σ f acting from the hub ring 6 when the inner ring 7 is attached to the hub ring 6 exceeds 300 MPa, the rolling life does not decrease due to the improvement of fatigue strength, and the wheel bearing device 1 in the corrosive environment Since the inner ring 7 is not corroded by use, the occurrence of hydrogen embrittlement cracking of the inner ring 7 can be suppressed even when the hoop stress σ f acting on the inner ring 7 exceeds 300 MPa.

以上、本発明の軸受用内輪の取付構造及び車輪用軸受装置を上記の実施の形態に基づいて説明したが、本発明は上記の実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の態様において実施することが可能であり、例えば次に示すような変形も可能である。   The bearing inner ring mounting structure and the wheel bearing device according to the present invention have been described based on the above embodiment, but the present invention is not limited to the above embodiment and does not depart from the gist thereof. The present invention can be implemented in various modes within the scope, and for example, the following modifications are possible.

（１）上記実施の形態では、転がり軸受が転動体４，５を円すいころとする円すいころ軸受である場合について説明したが、本発明はこれに限定されず、例えば転動体を円筒ローラとする他のころ軸受でもよく、また転動体をボール（玉）とする玉軸受からなる転がり軸受であってもよい。 (1) In the above embodiment, the case where the rolling bearing is a tapered roller bearing in which the rolling elements 4 and 5 are tapered rollers has been described. However, the present invention is not limited to this, and for example, the rolling element is a cylindrical roller. Other roller bearings may be used, and a rolling bearing composed of a ball bearing having rolling elements as balls may be used.

（２）上記実施の形態では、駆動輪用軸受装置に適用する場合について説明したが、本発明はこれに限定されず、従動輪用軸受装置にも上記実施の形態と同様に適用可能である。 (2) In the above-described embodiment, the case where the present invention is applied to a drive wheel bearing device has been described. However, the present invention is not limited to this, and the present invention can also be applied to a driven wheel bearing device as in the above-described embodiment. .

１…車輪用軸受装置、２…内方部材、３…外方部材、３ａ，３ｂ…外側軌道面、３ｃ…センサ取付孔、４，５…転動体、６…ハブ輪、６ａ…大径の胴部、６０ａ…車輪取付用フランジ、６００ａ…ボルト挿通孔、６ｂ…小径の胴部、６０ｂ…凹部、６２ｂ…かしめ部、６ｃ…貫通孔、７…内輪、７０…第１の内輪部材、７０ａ…第１の内側軌道面、７０ｂ…仕切部、７０ｃ…リング取付面、７０ｄ…凹溝、７１…第２の内輪部材、７１ａ…第２の内側軌道面、７１ｂ…車体側端面、７１ｄ…凹溝、８…ハブボルト、９…パルサーリング、１０…ＡＢＳセンサ、１１…ころ保持器、１２…シール部材、１３…ころ保持器、１４…シール部材   DESCRIPTION OF SYMBOLS 1 ... Wheel bearing apparatus, 2 ... Inner member, 3 ... Outer member, 3a, 3b ... Outer raceway surface, 3c ... Sensor mounting hole, 4, 5 ... Rolling element, 6 ... Hub wheel, 6a ... Large diameter Body, 60a ... Wheel mounting flange, 600a ... Bolt insertion hole, 6b ... Small diameter body, 60b ... Recess, 62b ... Caulking part, 6c ... Through hole, 7 ... Inner ring, 70 ... First inner ring member, 70a ... first inner raceway surface, 70b ... partition, 70c ... ring mounting surface, 70d ... concave groove, 71 ... second inner ring member, 71a ... second inner raceway surface, 71b ... vehicle body side end face, 71d ... concave Groove, 8 ... Hub bolt, 9 ... Pulsar ring, 10 ... ABS sensor, 11 ... Roller cage, 12 ... Seal member, 13 ... Roller cage, 14 ... Seal member

Claims (2)

転動体を転動させる内輪を有する転がり軸受を介して車体側にハブ輪を回転可能に支持する車輪用軸受装置において、前記内輪に前記ハブ輪を挿通させ、前記ハブ輪の車体側挿通端部及び車輪側挿通端部のうち車体側挿通端部を前記内輪の車体側端面へかしめることにより、前記ハブ輪に前記内輪を取り付ける構造であって、
前記内輪は、３００ＭＰａを超えるフープ応力が作用する状態で前記ハブ輪に取り付けられ、かつ０．５０質量％以上１．５０質量％以下のクロムを含有する浸炭鋼によって形成されている
軸受用内輪の取付構造。 In a wheel bearing device for rotatably supporting a hub wheel on a vehicle body side via a rolling bearing having an inner ring for rolling rolling elements, the hub wheel is inserted into the inner ring, and a vehicle body side insertion end portion of the hub wheel And the structure that attaches the inner ring to the hub wheel by caulking the vehicle body side insertion end part of the wheel side insertion end part to the vehicle body side end surface of the inner ring,
The inner ring is attached to the hub ring in a state in which a hoop stress exceeding 300 MPa is applied, and is formed of carburized steel containing chromium of 0.50% by mass or more and 1.50% by mass or less. Mounting structure. 請求項１に記載の軸受用内輪の取付構造を用いて構成された車輪用軸受装置。   A wheel bearing device configured using the bearing inner ring mounting structure according to claim 1.
JP2012018515A 2012-01-31 2012-01-31 Mounting structure of inner ring of bearing, and bearing device for wheel Pending JP2013155842A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH051985A (en) * 1991-06-25 1993-01-08 Nippon Seiko Kk Measurement method for fatigue crack development velocity of bearing inner race
JP2002021858A (en) * 2000-07-06 2002-01-23 Ntn Corp Wheel axle bearing device
JP2005098320A (en) * 2003-09-22 2005-04-14 Nsk Ltd Bearing apparatus for supporting wheel
JP2005282691A (en) * 2004-03-29 2005-10-13 Nsk Ltd Rolling bearing and wheel supporting bearing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH051985A (en) * 1991-06-25 1993-01-08 Nippon Seiko Kk Measurement method for fatigue crack development velocity of bearing inner race
JP2002021858A (en) * 2000-07-06 2002-01-23 Ntn Corp Wheel axle bearing device
JP2005098320A (en) * 2003-09-22 2005-04-14 Nsk Ltd Bearing apparatus for supporting wheel
JP2005282691A (en) * 2004-03-29 2005-10-13 Nsk Ltd Rolling bearing and wheel supporting bearing device

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